[PATCH v5 0/2] Add support for Omnivision OV5647

[PATCH v5 0/2] Add support for Omnivision OV5647

[Ramiro Oliveira]

Hello,

This patch adds support for the Omnivision OV5647 sensor.

At the moment it only supports 640x480 in Raw 8.

This is the fifth version of the OV5647 camera driver patchset.

v5:
 - Refactor code 
 - Change comments
 - Add missing error handling in some functions

v4: 
 - Add correct license
 - Revert debugging info to generic infrastructure
 - Turn defines into enums
 - Correct code style issues
 - Remove unused defines
 - Make sure all errors where being handled
 - Rename some functions to make code more readable
 - Add some debugging info

v3: 
 - No changes. Re-submitted due to lack of responses

v2: 
 - Corrections in DT documentation

Ramiro Oliveira (2):
  Add OV5647 device tree documentation
  Add support for OV5647 sensor

 .../devicetree/bindings/media/i2c/ov5647.txt       |  19 +
 MAINTAINERS                                        |   7 +
 drivers/media/i2c/Kconfig                          |  12 +
 drivers/media/i2c/Makefile                         |   1 +
 drivers/media/i2c/ov5647.c                         | 866 +++++++++++++++++++++
 5 files changed, 905 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
 create mode 100644 drivers/media/i2c/ov5647.c

-- 
2.10.2


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[PATCH v5 1/2] Add OV5647 device tree documentation

[Ramiro Oliveira]

Add device tree documentation.

Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
---
 .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
new file mode 100644
index 0000000..4c91b3b
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
@@ -0,0 +1,19 @@
+Omnivision OV5647 raw image sensor
+---------------------------------
+
+OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
+and CCI (I2C compatible) control bus.
+
+Required properties:
+
+- compatible	: "ovti,ov5647";
+- reg		: I2C slave address of the sensor;
+
+The common video interfaces bindings (see video-interfaces.txt) should be
+used to specify link to the image data receiver. The OV5647 device
+node should contain one 'port' child node with an 'endpoint' subnode.
+
+Following properties are valid for the endpoint node:
+
+- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
+  video-interfaces.txt.  The sensor supports only two data lanes.
-- 
2.10.2


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Re: [PATCH v5 1/2] Add OV5647 device tree documentation

[Sakari Ailus]

Hi Ramiro,

Thank you for the patch.

On Mon, Dec 05, 2016 at 05:36:33PM +0000, Ramiro Oliveira wrote:
> Add device tree documentation.
> 
> Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
> ---
>  .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
> new file mode 100644
> index 0000000..4c91b3b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
> @@ -0,0 +1,19 @@
> +Omnivision OV5647 raw image sensor
> +---------------------------------
> +
> +OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
> +and CCI (I2C compatible) control bus.
> +
> +Required properties:
> +
> +- compatible	: "ovti,ov5647";
> +- reg		: I2C slave address of the sensor;
> +
> +The common video interfaces bindings (see video-interfaces.txt) should be
> +used to specify link to the image data receiver. The OV5647 device
> +node should contain one 'port' child node with an 'endpoint' subnode.
> +
> +Following properties are valid for the endpoint node:
> +
> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
> +  video-interfaces.txt.  The sensor supports only two data lanes.

Doesn't this sensor require a external clock, a reset GPIO and / or a
regulator or a few? Do you need data-lanes, unless you can change the order
or the number?

An example DT snippet wouldn't hurt.

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus-X3B1VOXEql0@public.gmane.org	XMPP: sailus-PCDdDYkjdNMDXYZnReoRVg@public.gmane.org
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Re: [PATCH v5 1/2] Add OV5647 device tree documentation

[Ramiro Oliveira]

Hi Sakari,

Thank you for the feedback.

On 12/7/2016 10:33 PM, Sakari Ailus wrote:
> Hi Ramiro,
> 
> Thank you for the patch.
> 
> On Mon, Dec 05, 2016 at 05:36:33PM +0000, Ramiro Oliveira wrote:
>> Add device tree documentation.
>>
>> Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
>> ---
>>  .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
>>  1 file changed, 19 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
>>
>> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
>> new file mode 100644
>> index 0000000..4c91b3b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
>> @@ -0,0 +1,19 @@
>> +Omnivision OV5647 raw image sensor
>> +---------------------------------
>> +
>> +OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
>> +and CCI (I2C compatible) control bus.
>> +
>> +Required properties:
>> +
>> +- compatible	: "ovti,ov5647";
>> +- reg		: I2C slave address of the sensor;
>> +
>> +The common video interfaces bindings (see video-interfaces.txt) should be
>> +used to specify link to the image data receiver. The OV5647 device
>> +node should contain one 'port' child node with an 'endpoint' subnode.
>> +
>> +Following properties are valid for the endpoint node:
>> +
>> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
>> +  video-interfaces.txt.  The sensor supports only two data lanes.
> 
> Doesn't this sensor require a external clock, a reset GPIO and / or a
> regulator or a few? Do you need data-lanes, unless you can change the order
> or the number?

In the setup I'm using, I'm not aware of any reset GPIO or regulator. I do use a
external clock but it's fixed and not controlled by SW. Should I add a property
for this?

> 
> An example DT snippet wouldn't hurt.

Sure, I can add a example snippet.

> 

Re: [PATCH v5 1/2] Add OV5647 device tree documentation

[Sakari Ailus]

Hi Ramiro,

On Mon, Dec 12, 2016 at 11:39:31AM +0000, Ramiro Oliveira wrote:
> Hi Sakari,
> 
> Thank you for the feedback.
> 
> On 12/7/2016 10:33 PM, Sakari Ailus wrote:
> > Hi Ramiro,
> > 
> > Thank you for the patch.
> > 
> > On Mon, Dec 05, 2016 at 05:36:33PM +0000, Ramiro Oliveira wrote:
> >> Add device tree documentation.
> >>
> >> Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
> >> ---
> >>  .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
> >>  1 file changed, 19 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >>
> >> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >> new file mode 100644
> >> index 0000000..4c91b3b
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >> @@ -0,0 +1,19 @@
> >> +Omnivision OV5647 raw image sensor
> >> +---------------------------------
> >> +
> >> +OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
> >> +and CCI (I2C compatible) control bus.
> >> +
> >> +Required properties:
> >> +
> >> +- compatible	: "ovti,ov5647";
> >> +- reg		: I2C slave address of the sensor;
> >> +
> >> +The common video interfaces bindings (see video-interfaces.txt) should be
> >> +used to specify link to the image data receiver. The OV5647 device
> >> +node should contain one 'port' child node with an 'endpoint' subnode.
> >> +
> >> +Following properties are valid for the endpoint node:
> >> +
> >> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
> >> +  video-interfaces.txt.  The sensor supports only two data lanes.
> > 
> > Doesn't this sensor require a external clock, a reset GPIO and / or a
> > regulator or a few? Do you need data-lanes, unless you can change the order
> > or the number?
> 
> In the setup I'm using, I'm not aware of any reset GPIO or regulator. I do use a
> external clock but it's fixed and not controlled by SW. Should I add a property
> for this?

The sensor datasheet defines a power-up and power-down sequence for the
device. If you don't implement these sequences in the driver on a DT based
system, nothing suggests that they're implemented correctly. Could it be
that the boot loader simply enables the regulators or another device
requires them to be enabled?

I presume at least the reset GPIO should be controlled explicitly in order
to ensure correct function. Although hardware can be surprising: I have one
production system that has no reset GPIO for the sensor albeit the sensor
datasheet says that's part of the power up sequence.

> 
> > 
> > An example DT snippet wouldn't hurt.
> 
> Sure, I can add a example snippet.
> 
> > 
> 

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus-X3B1VOXEql0@public.gmane.org	XMPP: sailus-PCDdDYkjdNMDXYZnReoRVg@public.gmane.org
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Re: [PATCH v5 1/2] Add OV5647 device tree documentation

[Ramiro Oliveira]

Hi Sakari

On 12/12/2016 11:49 AM, Sakari Ailus wrote:
> Hi Ramiro,
> 
> On Mon, Dec 12, 2016 at 11:39:31AM +0000, Ramiro Oliveira wrote:
>> Hi Sakari,
>>
>> Thank you for the feedback.
>>
>> On 12/7/2016 10:33 PM, Sakari Ailus wrote:
>>> Hi Ramiro,
>>>
>>> Thank you for the patch.
>>>
>>> On Mon, Dec 05, 2016 at 05:36:33PM +0000, Ramiro Oliveira wrote:
>>>> Add device tree documentation.
>>>>
>>>> Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
>>>> ---
>>>>  .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
>>>>  1 file changed, 19 insertions(+)
>>>>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
>>>> new file mode 100644
>>>> index 0000000..4c91b3b
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
>>>> @@ -0,0 +1,19 @@
>>>> +Omnivision OV5647 raw image sensor
>>>> +---------------------------------
>>>> +
>>>> +OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
>>>> +and CCI (I2C compatible) control bus.
>>>> +
>>>> +Required properties:
>>>> +
>>>> +- compatible	: "ovti,ov5647";
>>>> +- reg		: I2C slave address of the sensor;
>>>> +
>>>> +The common video interfaces bindings (see video-interfaces.txt) should be
>>>> +used to specify link to the image data receiver. The OV5647 device
>>>> +node should contain one 'port' child node with an 'endpoint' subnode.
>>>> +
>>>> +Following properties are valid for the endpoint node:
>>>> +
>>>> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
>>>> +  video-interfaces.txt.  The sensor supports only two data lanes.
>>>
>>> Doesn't this sensor require a external clock, a reset GPIO and / or a
>>> regulator or a few? Do you need data-lanes, unless you can change the order
>>> or the number?
>>
>> In the setup I'm using, I'm not aware of any reset GPIO or regulator. I do use a
>> external clock but it's fixed and not controlled by SW. Should I add a property
>> for this?
> 
> The sensor datasheet defines a power-up and power-down sequence for the
> device. If you don't implement these sequences in the driver on a DT based
> system, nothing suggests that they're implemented correctly. Could it be
> that the boot loader simply enables the regulators or another device
> requires them to be enabled?
> 
> I presume at least the reset GPIO should be controlled explicitly in order
> to ensure correct function. Although hardware can be surprising: I have one
> production system that has no reset GPIO for the sensor albeit the sensor
> datasheet says that's part of the power up sequence.
> 

Sorry for the misunderstanding. I wanted to say that, there is no SW controlled
reset. In the board we're using to connect the sensor to our D-PHY we have a
GPIO controller that when it receives power, it removes the sensor from reset,
so I have no control over that.

Regarding the clock, should I create a new property?

And also, regarding the data-lanes, AFAIK it isn't possible to change the order
of the data and clock lanes so should I remove that property?

>>
>>>
>>> An example DT snippet wouldn't hurt.
>>
>> Sure, I can add a example snippet.
>>
>>>
>>
> 
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Re: [PATCH v5 1/2] Add OV5647 device tree documentation

[Sakari Ailus]

Hi Ramiro,

On Mon, Dec 12, 2016 at 12:15:04PM +0000, Ramiro Oliveira wrote:
> Hi Sakari
> 
> On 12/12/2016 11:49 AM, Sakari Ailus wrote:
> > Hi Ramiro,
> > 
> > On Mon, Dec 12, 2016 at 11:39:31AM +0000, Ramiro Oliveira wrote:
> >> Hi Sakari,
> >>
> >> Thank you for the feedback.
> >>
> >> On 12/7/2016 10:33 PM, Sakari Ailus wrote:
> >>> Hi Ramiro,
> >>>
> >>> Thank you for the patch.
> >>>
> >>> On Mon, Dec 05, 2016 at 05:36:33PM +0000, Ramiro Oliveira wrote:
> >>>> Add device tree documentation.
> >>>>
> >>>> Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
> >>>> ---
> >>>>  .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
> >>>>  1 file changed, 19 insertions(+)
> >>>>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >>>>
> >>>> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >>>> new file mode 100644
> >>>> index 0000000..4c91b3b
> >>>> --- /dev/null
> >>>> +++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >>>> @@ -0,0 +1,19 @@
> >>>> +Omnivision OV5647 raw image sensor
> >>>> +---------------------------------
> >>>> +
> >>>> +OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
> >>>> +and CCI (I2C compatible) control bus.
> >>>> +
> >>>> +Required properties:
> >>>> +
> >>>> +- compatible	: "ovti,ov5647";
> >>>> +- reg		: I2C slave address of the sensor;
> >>>> +
> >>>> +The common video interfaces bindings (see video-interfaces.txt) should be
> >>>> +used to specify link to the image data receiver. The OV5647 device
> >>>> +node should contain one 'port' child node with an 'endpoint' subnode.
> >>>> +
> >>>> +Following properties are valid for the endpoint node:
> >>>> +
> >>>> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
> >>>> +  video-interfaces.txt.  The sensor supports only two data lanes.
> >>>
> >>> Doesn't this sensor require a external clock, a reset GPIO and / or a
> >>> regulator or a few? Do you need data-lanes, unless you can change the order
> >>> or the number?
> >>
> >> In the setup I'm using, I'm not aware of any reset GPIO or regulator. I do use a
> >> external clock but it's fixed and not controlled by SW. Should I add a property
> >> for this?
> > 
> > The sensor datasheet defines a power-up and power-down sequence for the
> > device. If you don't implement these sequences in the driver on a DT based
> > system, nothing suggests that they're implemented correctly. Could it be
> > that the boot loader simply enables the regulators or another device
> > requires them to be enabled?
> > 
> > I presume at least the reset GPIO should be controlled explicitly in order
> > to ensure correct function. Although hardware can be surprising: I have one
> > production system that has no reset GPIO for the sensor albeit the sensor
> > datasheet says that's part of the power up sequence.
> > 
> 
> Sorry for the misunderstanding. I wanted to say that, there is no SW controlled
> reset. In the board we're using to connect the sensor to our D-PHY we have a
> GPIO controller that when it receives power, it removes the sensor from reset,
> so I have no control over that.

Do you mean to say that there's a GPIO controller but there's not (yet?) a
driver for that or that the reset line is actually hard-wired to something
else?

> 
> Regarding the clock, should I create a new property?

Yes. The sensor does require a clock.

> 
> And also, regarding the data-lanes, AFAIK it isn't possible to change the order
> of the data and clock lanes so should I remove that property?

Sounds good to me.

> 
> >>
> >>>
> >>> An example DT snippet wouldn't hurt.
> >>
> >> Sure, I can add a example snippet.
> >>
> >>>
> >>
> > 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-media" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 
Sakari Ailus
e-mail: sakari.ailus-X3B1VOXEql0@public.gmane.org	XMPP: sailus-PCDdDYkjdNMDXYZnReoRVg@public.gmane.org
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Re: [PATCH v5 1/2] Add OV5647 device tree documentation

[Ramiro Oliveira]

Hi Sakari

On 12/12/2016 12:19 PM, Sakari Ailus wrote:
> Hi Ramiro,
> 
> On Mon, Dec 12, 2016 at 12:15:04PM +0000, Ramiro Oliveira wrote:
>> Hi Sakari
>>
>> On 12/12/2016 11:49 AM, Sakari Ailus wrote:
>>> Hi Ramiro,
>>>
>>> On Mon, Dec 12, 2016 at 11:39:31AM +0000, Ramiro Oliveira wrote:
>>>> Hi Sakari,
>>>>
>>>> Thank you for the feedback.
>>>>
>>>> On 12/7/2016 10:33 PM, Sakari Ailus wrote:
>>>>> Hi Ramiro,
>>>>>
>>>>> Thank you for the patch.
>>>>>
>>>>> On Mon, Dec 05, 2016 at 05:36:33PM +0000, Ramiro Oliveira wrote:
>>>>>> Add device tree documentation.
>>>>>>
>>>>>> Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
>>>>>> ---
>>>>>>  .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
>>>>>>  1 file changed, 19 insertions(+)
>>>>>>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
>>>>>>
>>>>>> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
>>>>>> new file mode 100644
>>>>>> index 0000000..4c91b3b
>>>>>> --- /dev/null
>>>>>> +++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
>>>>>> @@ -0,0 +1,19 @@
>>>>>> +Omnivision OV5647 raw image sensor
>>>>>> +---------------------------------
>>>>>> +
>>>>>> +OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
>>>>>> +and CCI (I2C compatible) control bus.
>>>>>> +
>>>>>> +Required properties:
>>>>>> +
>>>>>> +- compatible	: "ovti,ov5647";
>>>>>> +- reg		: I2C slave address of the sensor;
>>>>>> +
>>>>>> +The common video interfaces bindings (see video-interfaces.txt) should be
>>>>>> +used to specify link to the image data receiver. The OV5647 device
>>>>>> +node should contain one 'port' child node with an 'endpoint' subnode.
>>>>>> +
>>>>>> +Following properties are valid for the endpoint node:
>>>>>> +
>>>>>> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
>>>>>> +  video-interfaces.txt.  The sensor supports only two data lanes.
>>>>>
>>>>> Doesn't this sensor require a external clock, a reset GPIO and / or a
>>>>> regulator or a few? Do you need data-lanes, unless you can change the order
>>>>> or the number?
>>>>
>>>> In the setup I'm using, I'm not aware of any reset GPIO or regulator. I do use a
>>>> external clock but it's fixed and not controlled by SW. Should I add a property
>>>> for this?
>>>
>>> The sensor datasheet defines a power-up and power-down sequence for the
>>> device. If you don't implement these sequences in the driver on a DT based
>>> system, nothing suggests that they're implemented correctly. Could it be
>>> that the boot loader simply enables the regulators or another device
>>> requires them to be enabled?
>>>
>>> I presume at least the reset GPIO should be controlled explicitly in order
>>> to ensure correct function. Although hardware can be surprising: I have one
>>> production system that has no reset GPIO for the sensor albeit the sensor
>>> datasheet says that's part of the power up sequence.
>>>
>>
>> Sorry for the misunderstanding. I wanted to say that, there is no SW controlled
>> reset. In the board we're using to connect the sensor to our D-PHY we have a
>> GPIO controller that when it receives power, it removes the sensor from reset,
>> so I have no control over that.
> 
> Do you mean to say that there's a GPIO controller but there's not (yet?) a
> driver for that or that the reset line is actually hard-wired to something
> else?
> 

The reset line is hardwired to a GPIO controller that when powered-on removes
the sensor from reset. However I have no control over the GPIO controller.

>>
>> Regarding the clock, should I create a new property?
> 
> Yes. The sensor does require a clock.
> 
>>
>> And also, regarding the data-lanes, AFAIK it isn't possible to change the order
>> of the data and clock lanes so should I remove that property?
> 
> Sounds good to me.
> 
>>
>>>>
>>>>>
>>>>> An example DT snippet wouldn't hurt.
>>>>
>>>> Sure, I can add a example snippet.
>>>>
>>>>>
>>>>
>>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-media" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: [PATCH v5 1/2] Add OV5647 device tree documentation

[Sakari Ailus]

Hi Ramiro,

On Mon, Dec 12, 2016 at 01:07:53PM +0000, Ramiro Oliveira wrote:
> Hi Sakari
> 
> On 12/12/2016 12:19 PM, Sakari Ailus wrote:
> > Hi Ramiro,
> > 
> > On Mon, Dec 12, 2016 at 12:15:04PM +0000, Ramiro Oliveira wrote:
> >> Hi Sakari
> >>
> >> On 12/12/2016 11:49 AM, Sakari Ailus wrote:
> >>> Hi Ramiro,
> >>>
> >>> On Mon, Dec 12, 2016 at 11:39:31AM +0000, Ramiro Oliveira wrote:
> >>>> Hi Sakari,
> >>>>
> >>>> Thank you for the feedback.
> >>>>
> >>>> On 12/7/2016 10:33 PM, Sakari Ailus wrote:
> >>>>> Hi Ramiro,
> >>>>>
> >>>>> Thank you for the patch.
> >>>>>
> >>>>> On Mon, Dec 05, 2016 at 05:36:33PM +0000, Ramiro Oliveira wrote:
> >>>>>> Add device tree documentation.
> >>>>>>
> >>>>>> Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
> >>>>>> ---
> >>>>>>  .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
> >>>>>>  1 file changed, 19 insertions(+)
> >>>>>>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >>>>>>
> >>>>>> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >>>>>> new file mode 100644
> >>>>>> index 0000000..4c91b3b
> >>>>>> --- /dev/null
> >>>>>> +++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
> >>>>>> @@ -0,0 +1,19 @@
> >>>>>> +Omnivision OV5647 raw image sensor
> >>>>>> +---------------------------------
> >>>>>> +
> >>>>>> +OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
> >>>>>> +and CCI (I2C compatible) control bus.
> >>>>>> +
> >>>>>> +Required properties:
> >>>>>> +
> >>>>>> +- compatible	: "ovti,ov5647";
> >>>>>> +- reg		: I2C slave address of the sensor;
> >>>>>> +
> >>>>>> +The common video interfaces bindings (see video-interfaces.txt) should be
> >>>>>> +used to specify link to the image data receiver. The OV5647 device
> >>>>>> +node should contain one 'port' child node with an 'endpoint' subnode.
> >>>>>> +
> >>>>>> +Following properties are valid for the endpoint node:
> >>>>>> +
> >>>>>> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
> >>>>>> +  video-interfaces.txt.  The sensor supports only two data lanes.
> >>>>>
> >>>>> Doesn't this sensor require a external clock, a reset GPIO and / or a
> >>>>> regulator or a few? Do you need data-lanes, unless you can change the order
> >>>>> or the number?
> >>>>
> >>>> In the setup I'm using, I'm not aware of any reset GPIO or regulator. I do use a
> >>>> external clock but it's fixed and not controlled by SW. Should I add a property
> >>>> for this?
> >>>
> >>> The sensor datasheet defines a power-up and power-down sequence for the
> >>> device. If you don't implement these sequences in the driver on a DT based
> >>> system, nothing suggests that they're implemented correctly. Could it be
> >>> that the boot loader simply enables the regulators or another device
> >>> requires them to be enabled?
> >>>
> >>> I presume at least the reset GPIO should be controlled explicitly in order
> >>> to ensure correct function. Although hardware can be surprising: I have one
> >>> production system that has no reset GPIO for the sensor albeit the sensor
> >>> datasheet says that's part of the power up sequence.
> >>>
> >>
> >> Sorry for the misunderstanding. I wanted to say that, there is no SW controlled
> >> reset. In the board we're using to connect the sensor to our D-PHY we have a
> >> GPIO controller that when it receives power, it removes the sensor from reset,
> >> so I have no control over that.
> > 
> > Do you mean to say that there's a GPIO controller but there's not (yet?) a
> > driver for that or that the reset line is actually hard-wired to something
> > else?
> > 
> 
> The reset line is hardwired to a GPIO controller that when powered-on removes
> the sensor from reset. However I have no control over the GPIO controller.

A GPIO controller is a piece of hardware that lets software to, typically,
both configure the direction and change and read the state of its input /
output pins. You seem to have something else on the board, such as chip
giving a power good signal.

If there really is no software control to to these resources, I suggest not
to implement the power up / down sequences as you can't test them anyway. We
can always add the DT properties (as optional) to the DT documentation.

You still should have the clock frequency in DT and check that in the
driver, even if you don't get a clock. Presumably your current register
lists assume a particular frequency but AFAIR that wasn't clearly visible
anywhere.

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus-X3B1VOXEql0@public.gmane.org	XMPP: sailus-PCDdDYkjdNMDXYZnReoRVg@public.gmane.org
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[PATCH v5 2/2] Add support for OV5647 sensor

[Ramiro Oliveira]

Add support for OV5647 sensor.

Modes supported:
 - 640x480 RAW 8

Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
---
 MAINTAINERS                |   7 +
 drivers/media/i2c/Kconfig  |  12 +
 drivers/media/i2c/Makefile |   1 +
 drivers/media/i2c/ov5647.c | 866 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 886 insertions(+)
 create mode 100644 drivers/media/i2c/ov5647.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 52cc077..72e828a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8923,6 +8923,13 @@ M:	Harald Welte <laforge-TgoAw6mPHtdg9hUCZPvPmw@public.gmane.org>
 S:	Maintained
 F:	drivers/char/pcmcia/cm4040_cs.*
 
+OMNIVISION OV5647 SENSOR DRIVER
+M:	Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
+L:	linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
+T:	git git://linuxtv.org/media_tree.git
+S:	Maintained
+F:	drivers/media/i2c/ov5647.c
+
 OMNIVISION OV7670 SENSOR DRIVER
 M:	Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>
 L:	linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index b31fa6f..c1b78e5 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -531,6 +531,18 @@ config VIDEO_OV2659
 	  To compile this driver as a module, choose M here: the
 	  module will be called ov2659.
 
+config VIDEO_OV5647
+	tristate "OmniVision OV5647 sensor support"
+	depends on OF
+	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_CAMERA_SUPPORT
+	---help---
+	  This is a Video4Linux2 sensor-level driver for the OmniVision
+	  OV5647 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov5647.
+
 config VIDEO_OV7640
 	tristate "OmniVision OV7640 sensor support"
 	depends on I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 92773b2..0d9014c 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -82,3 +82,4 @@ obj-$(CONFIG_VIDEO_IR_I2C)  += ir-kbd-i2c.o
 obj-$(CONFIG_VIDEO_ML86V7667)	+= ml86v7667.o
 obj-$(CONFIG_VIDEO_OV2659)	+= ov2659.o
 obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
+obj-$(CONFIG_VIDEO_OV5647)	+= ov5647.o
diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
new file mode 100644
index 0000000..2aae806
--- /dev/null
+++ b/drivers/media/i2c/ov5647.c
@@ -0,0 +1,866 @@
+/*
+ * A V4L2 driver for OmniVision OV5647 cameras.
+ *
+ * Based on Samsung S5K6AAFX SXGA 1/6" 1.3M CMOS Image Sensor driver
+ * Copyright (C) 2011 Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
+ *
+ * Based on Omnivision OV7670 Camera Driver
+ * Copyright (C) 2006-7 Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>
+ *
+ * Copyright (C) 2016, Synopsys, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed .as is. WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-mediabus.h>
+#include <media/v4l2-image-sizes.h>
+#include <media/v4l2-of.h>
+#include <linux/io.h>
+
+#define SENSOR_NAME "ov5647"
+
+#define OV5647_SW_RESET		0x1003
+#define OV5647_REG_CHIPID_H	0x300A
+#define OV5647_REG_CHIPID_L	0x300B
+
+#define REG_TERM 0xfffe
+#define VAL_TERM 0xfe
+#define REG_DLY  0xffff
+
+#define OV5647_ROW_START		0x01
+#define OV5647_ROW_START_MIN		0
+#define OV5647_ROW_START_MAX		2004
+#define OV5647_ROW_START_DEF		54
+
+#define OV5647_COLUMN_START		0x02
+#define OV5647_COLUMN_START_MIN		0
+#define OV5647_COLUMN_START_MAX		2750
+#define OV5647_COLUMN_START_DEF		16
+
+#define OV5647_WINDOW_HEIGHT		0x03
+#define OV5647_WINDOW_HEIGHT_MIN	2
+#define OV5647_WINDOW_HEIGHT_MAX	2006
+#define OV5647_WINDOW_HEIGHT_DEF	1944
+
+#define OV5647_WINDOW_WIDTH		0x04
+#define OV5647_WINDOW_WIDTH_MIN		2
+#define OV5647_WINDOW_WIDTH_MAX		2752
+#define OV5647_WINDOW_WIDTH_DEF		2592
+
+struct regval_list {
+	u16 addr;
+	u8 data;
+};
+
+struct cfg_array {
+	struct regval_list *regs;
+	int size;
+};
+
+struct sensor_win_size {
+	int width;
+	int height;
+	unsigned int hoffset;
+	unsigned int voffset;
+	unsigned int hts;
+	unsigned int vts;
+	unsigned int pclk;
+	unsigned int mipi_bps;
+	unsigned int fps_fixed;
+	unsigned int bin_factor;
+	unsigned int intg_min;
+	unsigned int intg_max;
+	void *regs;
+	int regs_size;
+	int (*set_size)(struct v4l2_subdev *sd);
+};
+
+
+struct ov5647 {
+	struct device			*dev;
+	struct v4l2_subdev		sd;
+	struct media_pad		pad;
+	struct mutex			lock;
+	struct v4l2_mbus_framefmt	format;
+	struct sensor_format_struct	*fmt;
+	unsigned int			width;
+	unsigned int			height;
+	unsigned int			capture_mode;
+	int				hue;
+	struct v4l2_fract		tpf;
+	struct sensor_win_size		*current_wins;
+};
+
+static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct ov5647, sd);
+}
+
+static struct regval_list sensor_oe_disable_regs[] = {
+	{0x3000, 0x00},
+	{0x3001, 0x00},
+	{0x3002, 0x00},
+};
+
+static struct regval_list sensor_oe_enable_regs[] = {
+	{0x3000, 0x0f},
+	{0x3001, 0xff},
+	{0x3002, 0xe4},
+};
+
+static struct regval_list ov5647_640x480[] = {
+	{0x0100, 0x00},
+	{0x0103, 0x01},
+	{0x3034, 0x08},
+	{0x3035, 0x21},
+	{0x3036, 0x46},
+	{0x303c, 0x11},
+	{0x3106, 0xf5},
+	{0x3821, 0x07},
+	{0x3820, 0x41},
+	{0x3827, 0xec},
+	{0x370c, 0x0f},
+	{0x3612, 0x59},
+	{0x3618, 0x00},
+	{0x5000, 0x06},
+	{0x5001, 0x01},
+	{0x5002, 0x41},
+	{0x5003, 0x08},
+	{0x5a00, 0x08},
+	{0x3000, 0x00},
+	{0x3001, 0x00},
+	{0x3002, 0x00},
+	{0x3016, 0x08},
+	{0x3017, 0xe0},
+	{0x3018, 0x44},
+	{0x301c, 0xf8},
+	{0x301d, 0xf0},
+	{0x3a18, 0x00},
+	{0x3a19, 0xf8},
+	{0x3c01, 0x80},
+	{0x3b07, 0x0c},
+	{0x380c, 0x07},
+	{0x380d, 0x68},
+	{0x380e, 0x03},
+	{0x380f, 0xd8},
+	{0x3814, 0x31},
+	{0x3815, 0x31},
+	{0x3708, 0x64},
+	{0x3709, 0x52},
+	{0x3808, 0x02},
+	{0x3809, 0x80},
+	{0x380a, 0x01},
+	{0x380b, 0xE0},
+	{0x3801, 0x00},
+	{0x3802, 0x00},
+	{0x3803, 0x00},
+	{0x3804, 0x0a},
+	{0x3805, 0x3f},
+	{0x3806, 0x07},
+	{0x3807, 0xa1},
+	{0x3811, 0x08},
+	{0x3813, 0x02},
+	{0x3630, 0x2e},
+	{0x3632, 0xe2},
+	{0x3633, 0x23},
+	{0x3634, 0x44},
+	{0x3636, 0x06},
+	{0x3620, 0x64},
+	{0x3621, 0xe0},
+	{0x3600, 0x37},
+	{0x3704, 0xa0},
+	{0x3703, 0x5a},
+	{0x3715, 0x78},
+	{0x3717, 0x01},
+	{0x3731, 0x02},
+	{0x370b, 0x60},
+	{0x3705, 0x1a},
+	{0x3f05, 0x02},
+	{0x3f06, 0x10},
+	{0x3f01, 0x0a},
+	{0x3a08, 0x01},
+	{0x3a09, 0x27},
+	{0x3a0a, 0x00},
+	{0x3a0b, 0xf6},
+	{0x3a0d, 0x04},
+	{0x3a0e, 0x03},
+	{0x3a0f, 0x58},
+	{0x3a10, 0x50},
+	{0x3a1b, 0x58},
+	{0x3a1e, 0x50},
+	{0x3a11, 0x60},
+	{0x3a1f, 0x28},
+	{0x4001, 0x02},
+	{0x4004, 0x02},
+	{0x4000, 0x09},
+	{0x4837, 0x24},
+	{0x4050, 0x6e},
+	{0x4051, 0x8f},
+	{0x0100, 0x01},
+};
+
+struct sensor_format_struct;
+
+/**
+ * @short I2C Write operation
+ * @param[in] i2c_client I2C client
+ * @param[in] reg register address
+ * @param[in] val value to write
+ * @return Error code
+ */
+static int ov5647_write(struct v4l2_subdev *sd, u16 reg, u8 val)
+{
+	int ret;
+	unsigned char data[3] = { reg >> 8, reg & 0xff, val};
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ret = i2c_master_send(client, data, 3);
+	if (ret != 3) {
+		dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
+				__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+	return 0;
+}
+
+/**
+ * @short I2C Read operation
+ * @param[in] i2c_client I2C client
+ * @param[in] reg register address
+ * @param[out] val value read
+ * @return Error code
+ */
+static int ov5647_read(struct v4l2_subdev *sd, u16 reg, u8 *val)
+{
+	int ret;
+	unsigned char data_w[2] = { reg >> 8, reg & 0xff };
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+
+	ret = i2c_master_send(client, data_w, 2);
+
+	if (ret < 2) {
+		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
+			__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+
+
+	ret = i2c_master_recv(client, val, 1);
+
+	if (ret < 1) {
+		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
+				__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+	return 0;
+}
+
+static int ov5647_write_array(struct v4l2_subdev *sd,
+				struct regval_list *regs, int array_size)
+{
+	int i = 0;
+	int ret = 0;
+
+	if (!regs)
+		return -EINVAL;
+
+	while (i < array_size) {
+		ret = ov5647_write(sd, regs->addr, regs->data);
+		if (ret < 0)
+			return ret;
+		i++;
+		regs++;
+	}
+	return 0;
+}
+
+static void ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
+{
+	u8 channel_id;
+
+	ov5647_read(sd, 0x4814, &channel_id);
+	channel_id &= ~(3 << 6);
+	ov5647_write(sd, 0x4814, channel_id | (channel << 6));
+}
+
+void ov5647_stream_on(struct v4l2_subdev *sd)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ov5647_write(sd, 0x4202, 0x00);
+	dev_dbg(&client->dev, "Stream on");
+	ov5647_write(sd, 0x300D, 0x00);
+}
+
+void ov5647_stream_off(struct v4l2_subdev *sd)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ov5647_write(sd, 0x4202, 0x0f);
+	dev_dbg(&client->dev, "Stream off");
+	ov5647_write(sd, 0x300D, 0x01);
+}
+
+/****************************************************************************/
+
+/**
+ * @short Set SW standby
+ * @param[in] sd v4l2 sd
+ * @param[in] stanby standby mode status (on or off)
+ * @return Error code
+ */
+static int set_sw_standby(struct v4l2_subdev *sd, bool standby)
+{
+	int ret;
+	unsigned char rdval;
+
+	ret = ov5647_read(sd, 0x0100, &rdval);
+	if (ret != 0)
+		return ret;
+
+	if (standby)
+		rdval &= 0xfe;
+	else
+		rdval |= 0x01;
+
+	ret = ov5647_write(sd, 0x0100, rdval);
+
+	return ret;
+}
+
+/**
+ * @short Store information about the video data format.
+ */
+static struct sensor_format_struct {
+	u8 *desc;
+	u32 mbus_code;
+	struct regval_list *regs;
+	int regs_size;
+	int bpp;
+} sensor_formats[] = {
+	{
+		.desc		= "Raw RGB Bayer",
+		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
+		.regs		= ov5647_640x480,
+		.regs_size	= ARRAY_SIZE(ov5647_640x480),
+		.bpp		= 1
+	},
+};
+#define N_FMTS ARRAY_SIZE(sensor_formats)
+
+/* ----------------------------------------------------------------------- */
+
+/**
+ * @short Initialize sensor
+ * @param[in] sd v4l2 subdev
+ * @param[in] val not used
+ * @return Error code
+ */
+static int __sensor_init(struct v4l2_subdev *sd)
+{
+	int ret;
+	u8 resetval;
+	u8 rdval;
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	dev_dbg(&client->dev, "sensor init\n");
+
+	ret = ov5647_read(sd, 0x0100, &rdval);
+	if (ret != 0)
+		return ret;
+
+	ov5647_write(sd, 0x4800, 0x25);
+	ov5647_stream_off(sd);
+
+	ret = ov5647_write_array(sd, ov5647_640x480,
+					ARRAY_SIZE(ov5647_640x480));
+	if (ret < 0) {
+		dev_err(&client->dev, "write sensor_default_regs error\n");
+		return ret;
+	}
+
+	ov5647_set_virtual_channel(sd, 0);
+
+	ov5647_read(sd, 0x0100, &resetval);
+	if (!(resetval & 0x01)) {
+		dev_err(&client->dev, "Device was in SW standby");
+		ov5647_write(sd, 0x0100, 0x01);
+	}
+
+	ov5647_write(sd, 0x4800, 0x04);
+	ov5647_stream_on(sd);
+
+	return 0;
+}
+
+/**
+ * @short Control sensor power state
+ * @param[in] sd v4l2 subdev
+ * @param[in] on Sensor power
+ * @return Error code
+ */
+static int sensor_power(struct v4l2_subdev *sd, int on)
+{
+	int ret;
+	struct ov5647 *ov5647 = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ret = 0;
+	mutex_lock(&ov5647->lock);
+
+	if (on)	{
+		dev_dbg(&client->dev, "OV5647 power on\n");
+
+		ret = ov5647_write_array(sd, sensor_oe_enable_regs,
+				ARRAY_SIZE(sensor_oe_enable_regs));
+
+		ret = __sensor_init(sd);
+
+		if (ret < 0)
+			dev_err(&client->dev,
+				"Camera not available, check Power\n");
+	} else {
+		dev_dbg(&client->dev, "OV5647 power off\n");
+
+		dev_dbg(&client->dev, "disable oe\n");
+		ret = ov5647_write_array(sd, sensor_oe_disable_regs,
+				ARRAY_SIZE(sensor_oe_disable_regs));
+
+		if (ret < 0)
+			dev_dbg(&client->dev, "disable oe failed\n");
+
+		ret = set_sw_standby(sd, true);
+
+		if (ret < 0)
+			dev_dbg(&client->dev, "soft stby failed\n");
+
+	}
+
+	mutex_unlock(&ov5647->lock);
+
+	return ret;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+/**
+ * @short Get register value
+ * @param[in] sd v4l2 subdev
+ * @param[in] reg register struct
+ * @return Error code
+ */
+static int sensor_get_register(struct v4l2_subdev *sd,
+				struct v4l2_dbg_register *reg)
+{
+	unsigned char val = 0;
+	int ret;
+
+	ret = ov5647_read(sd, reg->reg & 0xff, &val);
+	if (ret != 0)
+		return ret;
+
+	reg->val = val;
+	reg->size = 1;
+
+	return ret;
+}
+
+/**
+ * @short Set register value
+ * @param[in] sd v4l2 subdev
+ * @param[in] reg register struct
+ * @return Error code
+ */
+static int sensor_set_register(struct v4l2_subdev *sd,
+				const struct v4l2_dbg_register *reg)
+{
+	return ov5647_write(sd, reg->reg & 0xff, reg->val & 0xff);
+}
+#endif
+
+/* ----------------------------------------------------------------------- */
+
+/**
+ * @short Subdev core operations registration
+ */
+static const struct v4l2_subdev_core_ops sensor_core_ops = {
+	.s_power		= sensor_power,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.g_register		= sensor_get_register,
+	.s_register		= sensor_set_register,
+#endif
+};
+
+/* ----------------------------------------------------------------------- */
+
+
+
+/**
+ * @short Enumerate available image formats
+ * @param[in] sd v4l2 subdev
+ * @param[in] index index
+ * @param[in] code MBUS Pixel code
+ * @return Error code
+ */
+static int sensor_enum_fmt(struct v4l2_subdev *sd,
+		struct v4l2_subdev_pad_config *cfg,
+		struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->pad || code->index >= N_FMTS)
+		return -EINVAL;
+
+	code->code = sensor_formats[code->index].mbus_code;
+	return 0;
+}
+
+/**
+ * @short Try frame format internal function
+ * @param[in] sd v4l2 subdev
+ * @param[in] fmt frame format
+ * @return Error code
+ */
+static int sensor_try_fmt_internal(struct v4l2_subdev *sd,
+	struct v4l2_mbus_framefmt *fmt, struct sensor_format_struct **ret_fmt,
+	struct sensor_win_size **ret_wsize)
+{
+	int index;
+
+	for (index = 0; index < N_FMTS; index++)
+		if (sensor_formats[index].mbus_code == fmt->code)
+			break;
+
+	if (index >= N_FMTS)
+		return -EINVAL;
+
+	if (ret_fmt != NULL)
+		*ret_fmt = sensor_formats + index;
+
+	fmt->field = V4L2_FIELD_NONE;
+
+	return 0;
+}
+
+/**
+ * @short Set frame format
+ * @param[in] sd v4l2 subdev
+ * @param[in] fmt frame format
+ * @return Error code
+ */
+static int sensor_s_fmt(struct v4l2_subdev *sd,
+		struct v4l2_subdev_pad_config *cfg,
+		struct v4l2_subdev_format *fmt)
+{
+	int ret;
+	struct sensor_format_struct *sensor_fmt;
+	struct sensor_win_size *wsize;
+	struct ov5647 *info = to_state(sd);
+
+	ov5647_write_array(sd, sensor_oe_disable_regs,
+					ARRAY_SIZE(sensor_oe_disable_regs));
+
+	ret = sensor_try_fmt_internal(sd, &fmt->format,
+					&sensor_fmt, &wsize);
+	if (ret)
+		return ret;
+
+	ov5647_write_array(sd, sensor_fmt->regs, sensor_fmt->regs_size);
+
+	ret = 0;
+
+	if (wsize->regs)
+		ov5647_write_array(sd, wsize->regs, wsize->regs_size);
+
+	if (wsize->set_size)
+		wsize->set_size(sd);
+
+	info->fmt = sensor_fmt;
+	info->width = wsize->width;
+	info->height = wsize->height;
+
+	ov5647_write_array(sd, sensor_oe_enable_regs,
+				ARRAY_SIZE(sensor_oe_enable_regs));
+
+	return 0;
+}
+
+/**
+ * @short Set stream parameters
+ * @param[in] sd v4l2 subdev
+ * @param[in] parms stream parameters
+ * @return Error code
+ */
+static int sensor_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
+{
+	struct v4l2_captureparm *cp = &parms->parm.capture;
+	struct ov5647 *info = to_state(sd);
+
+	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (info->tpf.numerator == 0)
+		return -EINVAL;
+
+	info->capture_mode = cp->capturemode;
+
+	return 0;
+}
+
+/**
+ * @short Get stream parameters
+ * @param[in] sd v4l2 subdev
+ * @param[in] parms stream parameters
+ * @return Error code
+ */
+static int sensor_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
+{
+	struct v4l2_captureparm *cp = &parms->parm.capture;
+	struct ov5647 *info = to_state(sd);
+
+	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	memset(cp, 0, sizeof(struct v4l2_captureparm));
+	cp->capability = V4L2_CAP_TIMEPERFRAME;
+	cp->capturemode = info->capture_mode;
+
+	return 0;
+}
+
+/**
+ * @short Subdev video operations registration
+ *
+ */
+static const struct v4l2_subdev_video_ops sensor_video_ops = {
+	.s_parm		= sensor_s_parm,
+	.g_parm		= sensor_g_parm,
+};
+
+/* ----------------------------------------------------------------------- */
+
+/**
+ * @short Subdev operations registration
+ *
+ */
+static const struct v4l2_subdev_ops subdev_ops = {
+	.core			= &sensor_core_ops,
+	.video			= &sensor_video_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev internal operations
+ */
+
+/**
+ * @short Detect camera version and model
+ * @param[in] sd v4l2 subdev
+ * @return Error code
+ */
+int ov5647_detect(struct v4l2_subdev *sd)
+{
+	unsigned char v;
+	int ret;
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ret = ov5647_write(sd, OV5647_SW_RESET, 0x01);
+	if (ret < 0)
+		return ret;
+	ret = ov5647_read(sd, OV5647_REG_CHIPID_H, &v);
+	if (ret < 0)
+		return ret;
+	if (v != 0x56) {
+		dev_err(&client->dev, "Wrong model version detected");
+		return -ENODEV;
+	}
+	ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &v);
+	if (ret < 0)
+		return ret;
+	if (v != 0x47) {
+		dev_err(&client->dev, "Wrong model version detected");
+		return -ENODEV;
+	}
+
+	ret = ov5647_write(sd, OV5647_SW_RESET, 0x00);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/**
+ * @short Detect if camera is registered
+ * @param[in] sd v4l2 subdev
+ * @return Error code
+ */
+static int ov5647_registered(struct v4l2_subdev *sd)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	dev_info(&client->dev, "OV5647 detected at address 0x%02x\n",
+				client->addr);
+
+	return 0;
+}
+
+/**
+ * @short Open device
+ * @param[in] sd v4l2 subdev
+ * @param[in] fh v4l2 file handler
+ * @return Error code
+ */
+static int ov5647_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_mbus_framefmt *format =
+				v4l2_subdev_get_try_format(sd, fh->pad, 0);
+	struct v4l2_rect *crop =
+				v4l2_subdev_get_try_crop(sd, fh->pad, 0);
+
+	crop->left = OV5647_COLUMN_START_DEF;
+	crop->top = OV5647_ROW_START_DEF;
+	crop->width = OV5647_WINDOW_WIDTH_DEF;
+	crop->height = OV5647_WINDOW_HEIGHT_DEF;
+
+	format->code = MEDIA_BUS_FMT_SBGGR8_1X8;
+
+	format->width = OV5647_WINDOW_WIDTH_DEF;
+	format->height = OV5647_WINDOW_HEIGHT_DEF;
+	format->field = V4L2_FIELD_NONE;
+	format->colorspace = V4L2_COLORSPACE_SRGB;
+
+	return sensor_power(sd, true);
+}
+
+/**
+ * @short Open device
+ * @param[in] sd v4l2 subdev
+ * @param[in] fh v4l2 file handler
+ * @return Error code
+ */
+static int ov5647_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	return sensor_power(sd, false);
+}
+
+/**
+ * @short Subdev internal operations registration
+ *
+ */
+static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
+	.registered = ov5647_registered,
+	.open = ov5647_open,
+	.close = ov5647_close,
+};
+
+/**
+ * @short Initialization routine - Entry point of the driver
+ * @param[in] client pointer to the i2c client structure
+ * @param[in] id pointer to the i2c device id structure
+ * @return 0 on success and a negative number on failure
+ */
+static int ov5647_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct ov5647 *sensor;
+	int ret = 0;
+	struct v4l2_subdev *sd;
+
+	dev_info(&client->dev, "Installing OmniVision OV5647 camera driver\n");
+
+	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
+	if (sensor == NULL)
+		return -ENOMEM;
+
+	mutex_init(&sensor->lock);
+	sensor->dev = dev;
+
+	sd = &sensor->sd;
+	v4l2_i2c_subdev_init(sd, client, &subdev_ops);
+	sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
+	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
+	if (ret < 0)
+		goto mutex_remove;
+
+	ret = ov5647_detect(sd);
+	if (ret < 0)
+		goto error;
+
+	ret = v4l2_async_register_subdev(sd);
+	if (ret < 0)
+		goto error;
+
+	return 0;
+error:
+	media_entity_cleanup(&sd->entity);
+mutex_remove:
+	mutex_destroy(&sensor->lock);
+	return ret;
+}
+
+/**
+ * @short Exit routine - Exit point of the driver
+ * @param[in] client pointer to the i2c client structure
+ * @return 0 on success and a negative number on failure
+ */
+static int ov5647_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov5647 *ov5647 = to_state(sd);
+
+	v4l2_async_unregister_subdev(&ov5647->sd);
+	media_entity_cleanup(&ov5647->sd.entity);
+	v4l2_device_unregister_subdev(sd);
+	mutex_destroy(&ov5647->lock);
+
+	return 0;
+}
+
+static const struct i2c_device_id ov5647_id[] = {
+	{ "ov5647", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ov5647_id);
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id ov5647_of_match[] = {
+	{ .compatible = "ovti,ov5647" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ov5647_of_match);
+#endif
+
+/**
+ * @short i2c driver structure
+ */
+static struct i2c_driver ov5647_driver = {
+	.driver = {
+		.of_match_table = of_match_ptr(ov5647_of_match),
+		.owner	= THIS_MODULE,
+		.name	= "ov5647",
+	},
+	.probe		= ov5647_probe,
+	.remove		= ov5647_remove,
+	.id_table	= ov5647_id,
+};
+
+module_i2c_driver(ov5647_driver);
+
+MODULE_AUTHOR("Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("A low-level driver for OmniVision ov5647 sensors");
+MODULE_LICENSE("GPL v2");
-- 
2.10.2


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Re: [PATCH v5 2/2] Add support for OV5647 sensor

[Sakari Ailus]

Hi Ramiro,

On Mon, Dec 05, 2016 at 05:36:34PM +0000, Ramiro Oliveira wrote:
> Add support for OV5647 sensor.
> 
> Modes supported:
>  - 640x480 RAW 8
> 
> Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
> ---
>  MAINTAINERS                |   7 +
>  drivers/media/i2c/Kconfig  |  12 +
>  drivers/media/i2c/Makefile |   1 +
>  drivers/media/i2c/ov5647.c | 866 +++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 886 insertions(+)
>  create mode 100644 drivers/media/i2c/ov5647.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 52cc077..72e828a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8923,6 +8923,13 @@ M:	Harald Welte <laforge@gnumonks.org>
>  S:	Maintained
>  F:	drivers/char/pcmcia/cm4040_cs.*
>  
> +OMNIVISION OV5647 SENSOR DRIVER
> +M:	Ramiro Oliveira <roliveir@synopsys.com>
> +L:	linux-media@vger.kernel.org
> +T:	git git://linuxtv.org/media_tree.git
> +S:	Maintained
> +F:	drivers/media/i2c/ov5647.c
> +
>  OMNIVISION OV7670 SENSOR DRIVER
>  M:	Jonathan Corbet <corbet@lwn.net>
>  L:	linux-media@vger.kernel.org
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index b31fa6f..c1b78e5 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -531,6 +531,18 @@ config VIDEO_OV2659
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called ov2659.
>  
> +config VIDEO_OV5647
> +	tristate "OmniVision OV5647 sensor support"
> +	depends on OF

How does this driver depend on OF, other than matching the compatible
string?

> +	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> +	depends on MEDIA_CAMERA_SUPPORT
> +	---help---
> +	  This is a Video4Linux2 sensor-level driver for the OmniVision
> +	  OV5647 camera.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called ov5647.
> +
>  config VIDEO_OV7640
>  	tristate "OmniVision OV7640 sensor support"
>  	depends on I2C && VIDEO_V4L2
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index 92773b2..0d9014c 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -82,3 +82,4 @@ obj-$(CONFIG_VIDEO_IR_I2C)  += ir-kbd-i2c.o
>  obj-$(CONFIG_VIDEO_ML86V7667)	+= ml86v7667.o
>  obj-$(CONFIG_VIDEO_OV2659)	+= ov2659.o
>  obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
> +obj-$(CONFIG_VIDEO_OV5647)	+= ov5647.o
> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
> new file mode 100644
> index 0000000..2aae806
> --- /dev/null
> +++ b/drivers/media/i2c/ov5647.c
> @@ -0,0 +1,866 @@
> +/*
> + * A V4L2 driver for OmniVision OV5647 cameras.
> + *
> + * Based on Samsung S5K6AAFX SXGA 1/6" 1.3M CMOS Image Sensor driver
> + * Copyright (C) 2011 Sylwester Nawrocki <s.nawrocki@samsung.com>
> + *
> + * Based on Omnivision OV7670 Camera Driver
> + * Copyright (C) 2006-7 Jonathan Corbet <corbet@lwn.net>
> + *
> + * Copyright (C) 2016, Synopsys, Inc.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/delay.h>
> +#include <linux/videodev2.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-mediabus.h>
> +#include <media/v4l2-image-sizes.h>
> +#include <media/v4l2-of.h>
> +#include <linux/io.h>

Alphabetical order, please.

> +
> +#define SENSOR_NAME "ov5647"
> +
> +#define OV5647_SW_RESET		0x1003
> +#define OV5647_REG_CHIPID_H	0x300A
> +#define OV5647_REG_CHIPID_L	0x300B
> +
> +#define REG_TERM 0xfffe
> +#define VAL_TERM 0xfe
> +#define REG_DLY  0xffff
> +
> +#define OV5647_ROW_START		0x01
> +#define OV5647_ROW_START_MIN		0
> +#define OV5647_ROW_START_MAX		2004
> +#define OV5647_ROW_START_DEF		54
> +
> +#define OV5647_COLUMN_START		0x02
> +#define OV5647_COLUMN_START_MIN		0
> +#define OV5647_COLUMN_START_MAX		2750
> +#define OV5647_COLUMN_START_DEF		16
> +
> +#define OV5647_WINDOW_HEIGHT		0x03
> +#define OV5647_WINDOW_HEIGHT_MIN	2
> +#define OV5647_WINDOW_HEIGHT_MAX	2006
> +#define OV5647_WINDOW_HEIGHT_DEF	1944
> +
> +#define OV5647_WINDOW_WIDTH		0x04
> +#define OV5647_WINDOW_WIDTH_MIN		2
> +#define OV5647_WINDOW_WIDTH_MAX		2752
> +#define OV5647_WINDOW_WIDTH_DEF		2592
> +
> +struct regval_list {
> +	u16 addr;
> +	u8 data;
> +};
> +
> +struct cfg_array {
> +	struct regval_list *regs;
> +	int size;
> +};
> +
> +struct sensor_win_size {
> +	int width;
> +	int height;
> +	unsigned int hoffset;
> +	unsigned int voffset;
> +	unsigned int hts;
> +	unsigned int vts;
> +	unsigned int pclk;
> +	unsigned int mipi_bps;
> +	unsigned int fps_fixed;
> +	unsigned int bin_factor;
> +	unsigned int intg_min;
> +	unsigned int intg_max;
> +	void *regs;
> +	int regs_size;
> +	int (*set_size)(struct v4l2_subdev *sd);
> +};
> +
> +
> +struct ov5647 {
> +	struct device			*dev;
> +	struct v4l2_subdev		sd;
> +	struct media_pad		pad;
> +	struct mutex			lock;
> +	struct v4l2_mbus_framefmt	format;
> +	struct sensor_format_struct	*fmt;
> +	unsigned int			width;
> +	unsigned int			height;
> +	unsigned int			capture_mode;
> +	int				hue;

At least capture_mode and hue are unused. Please remove unused fields.

> +	struct v4l2_fract		tpf;
> +	struct sensor_win_size		*current_wins;
> +};
> +
> +static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
> +{
> +	return container_of(sd, struct ov5647, sd);
> +}
> +
> +static struct regval_list sensor_oe_disable_regs[] = {
> +	{0x3000, 0x00},
> +	{0x3001, 0x00},
> +	{0x3002, 0x00},
> +};
> +
> +static struct regval_list sensor_oe_enable_regs[] = {
> +	{0x3000, 0x0f},
> +	{0x3001, 0xff},
> +	{0x3002, 0xe4},
> +};
> +
> +static struct regval_list ov5647_640x480[] = {

Does this list expect a certain external clock frequency? If it does, should
you check that the actual frequency matches with the expectation?

> +	{0x0100, 0x00},
> +	{0x0103, 0x01},
> +	{0x3034, 0x08},
> +	{0x3035, 0x21},
> +	{0x3036, 0x46},
> +	{0x303c, 0x11},
> +	{0x3106, 0xf5},
> +	{0x3821, 0x07},
> +	{0x3820, 0x41},
> +	{0x3827, 0xec},
> +	{0x370c, 0x0f},
> +	{0x3612, 0x59},
> +	{0x3618, 0x00},
> +	{0x5000, 0x06},
> +	{0x5001, 0x01},
> +	{0x5002, 0x41},
> +	{0x5003, 0x08},
> +	{0x5a00, 0x08},
> +	{0x3000, 0x00},
> +	{0x3001, 0x00},
> +	{0x3002, 0x00},
> +	{0x3016, 0x08},
> +	{0x3017, 0xe0},
> +	{0x3018, 0x44},
> +	{0x301c, 0xf8},
> +	{0x301d, 0xf0},
> +	{0x3a18, 0x00},
> +	{0x3a19, 0xf8},
> +	{0x3c01, 0x80},
> +	{0x3b07, 0x0c},
> +	{0x380c, 0x07},
> +	{0x380d, 0x68},
> +	{0x380e, 0x03},
> +	{0x380f, 0xd8},
> +	{0x3814, 0x31},
> +	{0x3815, 0x31},
> +	{0x3708, 0x64},
> +	{0x3709, 0x52},
> +	{0x3808, 0x02},
> +	{0x3809, 0x80},
> +	{0x380a, 0x01},
> +	{0x380b, 0xE0},
> +	{0x3801, 0x00},
> +	{0x3802, 0x00},
> +	{0x3803, 0x00},
> +	{0x3804, 0x0a},
> +	{0x3805, 0x3f},
> +	{0x3806, 0x07},
> +	{0x3807, 0xa1},
> +	{0x3811, 0x08},
> +	{0x3813, 0x02},
> +	{0x3630, 0x2e},
> +	{0x3632, 0xe2},
> +	{0x3633, 0x23},
> +	{0x3634, 0x44},
> +	{0x3636, 0x06},
> +	{0x3620, 0x64},
> +	{0x3621, 0xe0},
> +	{0x3600, 0x37},
> +	{0x3704, 0xa0},
> +	{0x3703, 0x5a},
> +	{0x3715, 0x78},
> +	{0x3717, 0x01},
> +	{0x3731, 0x02},
> +	{0x370b, 0x60},
> +	{0x3705, 0x1a},
> +	{0x3f05, 0x02},
> +	{0x3f06, 0x10},
> +	{0x3f01, 0x0a},
> +	{0x3a08, 0x01},
> +	{0x3a09, 0x27},
> +	{0x3a0a, 0x00},
> +	{0x3a0b, 0xf6},
> +	{0x3a0d, 0x04},
> +	{0x3a0e, 0x03},
> +	{0x3a0f, 0x58},
> +	{0x3a10, 0x50},
> +	{0x3a1b, 0x58},
> +	{0x3a1e, 0x50},
> +	{0x3a11, 0x60},
> +	{0x3a1f, 0x28},
> +	{0x4001, 0x02},
> +	{0x4004, 0x02},
> +	{0x4000, 0x09},
> +	{0x4837, 0x24},
> +	{0x4050, 0x6e},
> +	{0x4051, 0x8f},
> +	{0x0100, 0x01},
> +};
> +
> +struct sensor_format_struct;
> +
> +/**
> + * @short I2C Write operation
> + * @param[in] i2c_client I2C client
> + * @param[in] reg register address
> + * @param[in] val value to write
> + * @return Error code
> + */
> +static int ov5647_write(struct v4l2_subdev *sd, u16 reg, u8 val)
> +{
> +	int ret;
> +	unsigned char data[3] = { reg >> 8, reg & 0xff, val};
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> +	ret = i2c_master_send(client, data, 3);
> +	if (ret != 3) {
> +		dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
> +				__func__, reg);
> +		return ret < 0 ? ret : -EIO;
> +	}
> +	return 0;
> +}
> +
> +/**
> + * @short I2C Read operation
> + * @param[in] i2c_client I2C client
> + * @param[in] reg register address
> + * @param[out] val value read
> + * @return Error code
> + */
> +static int ov5647_read(struct v4l2_subdev *sd, u16 reg, u8 *val)
> +{
> +	int ret;
> +	unsigned char data_w[2] = { reg >> 8, reg & 0xff };
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> +
> +	ret = i2c_master_send(client, data_w, 2);
> +
> +	if (ret < 2) {
> +		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
> +			__func__, reg);
> +		return ret < 0 ? ret : -EIO;
> +	}
> +
> +
> +	ret = i2c_master_recv(client, val, 1);
> +
> +	if (ret < 1) {
> +		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
> +				__func__, reg);
> +		return ret < 0 ? ret : -EIO;
> +	}
> +	return 0;
> +}
> +
> +static int ov5647_write_array(struct v4l2_subdev *sd,
> +				struct regval_list *regs, int array_size)
> +{
> +	int i = 0;
> +	int ret = 0;
> +
> +	if (!regs)
> +		return -EINVAL;
> +
> +	while (i < array_size) {
> +		ret = ov5647_write(sd, regs->addr, regs->data);
> +		if (ret < 0)
> +			return ret;
> +		i++;
> +		regs++;
> +	}
> +	return 0;
> +}
> +
> +static void ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
> +{
> +	u8 channel_id;
> +
> +	ov5647_read(sd, 0x4814, &channel_id);
> +	channel_id &= ~(3 << 6);
> +	ov5647_write(sd, 0x4814, channel_id | (channel << 6));
> +}
> +
> +void ov5647_stream_on(struct v4l2_subdev *sd)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> +	ov5647_write(sd, 0x4202, 0x00);
> +	dev_dbg(&client->dev, "Stream on");
> +	ov5647_write(sd, 0x300D, 0x00);
> +}
> +
> +void ov5647_stream_off(struct v4l2_subdev *sd)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> +	ov5647_write(sd, 0x4202, 0x0f);
> +	dev_dbg(&client->dev, "Stream off");
> +	ov5647_write(sd, 0x300D, 0x01);
> +}
> +
> +/****************************************************************************/
> +
> +/**
> + * @short Set SW standby
> + * @param[in] sd v4l2 sd
> + * @param[in] stanby standby mode status (on or off)
> + * @return Error code
> + */
> +static int set_sw_standby(struct v4l2_subdev *sd, bool standby)
> +{
> +	int ret;
> +	unsigned char rdval;
> +
> +	ret = ov5647_read(sd, 0x0100, &rdval);
> +	if (ret != 0)
> +		return ret;
> +
> +	if (standby)
> +		rdval &= 0xfe;
> +	else
> +		rdval |= 0x01;
> +
> +	ret = ov5647_write(sd, 0x0100, rdval);
> +
> +	return ret;
> +}
> +
> +/**
> + * @short Store information about the video data format.
> + */
> +static struct sensor_format_struct {
> +	u8 *desc;
> +	u32 mbus_code;
> +	struct regval_list *regs;
> +	int regs_size;
> +	int bpp;

At least desc and bpp are unused.

> +} sensor_formats[] = {
> +	{
> +		.desc		= "Raw RGB Bayer",
> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
> +		.regs		= ov5647_640x480,
> +		.regs_size	= ARRAY_SIZE(ov5647_640x480),
> +		.bpp		= 1
> +	},
> +};
> +#define N_FMTS ARRAY_SIZE(sensor_formats)
> +
> +/* ----------------------------------------------------------------------- */
> +
> +/**
> + * @short Initialize sensor
> + * @param[in] sd v4l2 subdev
> + * @param[in] val not used
> + * @return Error code
> + */
> +static int __sensor_init(struct v4l2_subdev *sd)
> +{
> +	int ret;
> +	u8 resetval;
> +	u8 rdval;
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> +	dev_dbg(&client->dev, "sensor init\n");
> +
> +	ret = ov5647_read(sd, 0x0100, &rdval);
> +	if (ret != 0)
> +		return ret;
> +
> +	ov5647_write(sd, 0x4800, 0x25);
> +	ov5647_stream_off(sd);
> +
> +	ret = ov5647_write_array(sd, ov5647_640x480,
> +					ARRAY_SIZE(ov5647_640x480));
> +	if (ret < 0) {
> +		dev_err(&client->dev, "write sensor_default_regs error\n");
> +		return ret;
> +	}
> +
> +	ov5647_set_virtual_channel(sd, 0);
> +
> +	ov5647_read(sd, 0x0100, &resetval);
> +	if (!(resetval & 0x01)) {
> +		dev_err(&client->dev, "Device was in SW standby");
> +		ov5647_write(sd, 0x0100, 0x01);
> +	}
> +
> +	ov5647_write(sd, 0x4800, 0x04);
> +	ov5647_stream_on(sd);
> +
> +	return 0;
> +}
> +
> +/**
> + * @short Control sensor power state
> + * @param[in] sd v4l2 subdev
> + * @param[in] on Sensor power
> + * @return Error code
> + */
> +static int sensor_power(struct v4l2_subdev *sd, int on)
> +{
> +	int ret;
> +	struct ov5647 *ov5647 = to_state(sd);
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> +	ret = 0;
> +	mutex_lock(&ov5647->lock);
> +
> +	if (on)	{
> +		dev_dbg(&client->dev, "OV5647 power on\n");
> +
> +		ret = ov5647_write_array(sd, sensor_oe_enable_regs,
> +				ARRAY_SIZE(sensor_oe_enable_regs));
> +
> +		ret = __sensor_init(sd);
> +
> +		if (ret < 0)
> +			dev_err(&client->dev,
> +				"Camera not available, check Power\n");
> +	} else {
> +		dev_dbg(&client->dev, "OV5647 power off\n");
> +
> +		dev_dbg(&client->dev, "disable oe\n");
> +		ret = ov5647_write_array(sd, sensor_oe_disable_regs,
> +				ARRAY_SIZE(sensor_oe_disable_regs));
> +
> +		if (ret < 0)
> +			dev_dbg(&client->dev, "disable oe failed\n");
> +
> +		ret = set_sw_standby(sd, true);
> +
> +		if (ret < 0)
> +			dev_dbg(&client->dev, "soft stby failed\n");
> +
> +	}
> +
> +	mutex_unlock(&ov5647->lock);
> +
> +	return ret;
> +}
> +
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +/**
> + * @short Get register value
> + * @param[in] sd v4l2 subdev
> + * @param[in] reg register struct
> + * @return Error code
> + */
> +static int sensor_get_register(struct v4l2_subdev *sd,
> +				struct v4l2_dbg_register *reg)
> +{
> +	unsigned char val = 0;
> +	int ret;
> +
> +	ret = ov5647_read(sd, reg->reg & 0xff, &val);
> +	if (ret != 0)
> +		return ret;
> +
> +	reg->val = val;
> +	reg->size = 1;
> +
> +	return ret;
> +}
> +
> +/**
> + * @short Set register value
> + * @param[in] sd v4l2 subdev
> + * @param[in] reg register struct
> + * @return Error code
> + */
> +static int sensor_set_register(struct v4l2_subdev *sd,
> +				const struct v4l2_dbg_register *reg)
> +{
> +	return ov5647_write(sd, reg->reg & 0xff, reg->val & 0xff);
> +}
> +#endif
> +
> +/* ----------------------------------------------------------------------- */
> +
> +/**
> + * @short Subdev core operations registration
> + */
> +static const struct v4l2_subdev_core_ops sensor_core_ops = {
> +	.s_power		= sensor_power,

The s_power() op will be called by the bridge (ISP) driver as well. You
should expect that it may be enabled more than once before being disabled
equal number of times.

> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +	.g_register		= sensor_get_register,
> +	.s_register		= sensor_set_register,
> +#endif
> +};
> +
> +/* ----------------------------------------------------------------------- */
> +
> +
> +
> +/**
> + * @short Enumerate available image formats
> + * @param[in] sd v4l2 subdev
> + * @param[in] index index
> + * @param[in] code MBUS Pixel code
> + * @return Error code
> + */
> +static int sensor_enum_fmt(struct v4l2_subdev *sd,
> +		struct v4l2_subdev_pad_config *cfg,
> +		struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->pad || code->index >= N_FMTS)
> +		return -EINVAL;
> +
> +	code->code = sensor_formats[code->index].mbus_code;
> +	return 0;
> +}
> +
> +/**
> + * @short Try frame format internal function
> + * @param[in] sd v4l2 subdev
> + * @param[in] fmt frame format
> + * @return Error code
> + */
> +static int sensor_try_fmt_internal(struct v4l2_subdev *sd,
> +	struct v4l2_mbus_framefmt *fmt, struct sensor_format_struct **ret_fmt,
> +	struct sensor_win_size **ret_wsize)
> +{
> +	int index;
> +
> +	for (index = 0; index < N_FMTS; index++)
> +		if (sensor_formats[index].mbus_code == fmt->code)
> +			break;
> +
> +	if (index >= N_FMTS)
> +		return -EINVAL;
> +
> +	if (ret_fmt != NULL)
> +		*ret_fmt = sensor_formats + index;
> +
> +	fmt->field = V4L2_FIELD_NONE;
> +
> +	return 0;
> +}
> +
> +/**
> + * @short Set frame format
> + * @param[in] sd v4l2 subdev
> + * @param[in] fmt frame format
> + * @return Error code
> + */
> +static int sensor_s_fmt(struct v4l2_subdev *sd,
> +		struct v4l2_subdev_pad_config *cfg,
> +		struct v4l2_subdev_format *fmt)
> +{
> +	int ret;
> +	struct sensor_format_struct *sensor_fmt;
> +	struct sensor_win_size *wsize;
> +	struct ov5647 *info = to_state(sd);
> +
> +	ov5647_write_array(sd, sensor_oe_disable_regs,
> +					ARRAY_SIZE(sensor_oe_disable_regs));

Should you check the error code here?

> +
> +	ret = sensor_try_fmt_internal(sd, &fmt->format,
> +					&sensor_fmt, &wsize);

Do you set wsize somewhere?

> +	if (ret)
> +		return ret;
> +
> +	ov5647_write_array(sd, sensor_fmt->regs, sensor_fmt->regs_size);

And here.

> +
> +	ret = 0;

ret was already zero.

> +
> +	if (wsize->regs)
> +		ov5647_write_array(sd, wsize->regs, wsize->regs_size);
> +
> +	if (wsize->set_size)
> +		wsize->set_size(sd);
> +
> +	info->fmt = sensor_fmt;
> +	info->width = wsize->width;
> +	info->height = wsize->height;
> +
> +	ov5647_write_array(sd, sensor_oe_enable_regs,
> +				ARRAY_SIZE(sensor_oe_enable_regs));
> +
> +	return 0;
> +}
> +
> +/**
> + * @short Set stream parameters
> + * @param[in] sd v4l2 subdev
> + * @param[in] parms stream parameters
> + * @return Error code
> + */
> +static int sensor_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
> +{
> +	struct v4l2_captureparm *cp = &parms->parm.capture;
> +	struct ov5647 *info = to_state(sd);
> +
> +	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> +		return -EINVAL;
> +
> +	if (info->tpf.numerator == 0)
> +		return -EINVAL;
> +
> +	info->capture_mode = cp->capturemode;
> +
> +	return 0;
> +}
> +
> +/**
> + * @short Get stream parameters
> + * @param[in] sd v4l2 subdev
> + * @param[in] parms stream parameters
> + * @return Error code
> + */
> +static int sensor_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
> +{
> +	struct v4l2_captureparm *cp = &parms->parm.capture;
> +	struct ov5647 *info = to_state(sd);
> +
> +	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> +		return -EINVAL;
> +
> +	memset(cp, 0, sizeof(struct v4l2_captureparm));
> +	cp->capability = V4L2_CAP_TIMEPERFRAME;
> +	cp->capturemode = info->capture_mode;
> +
> +	return 0;
> +}
> +
> +/**
> + * @short Subdev video operations registration
> + *
> + */
> +static const struct v4l2_subdev_video_ops sensor_video_ops = {
> +	.s_parm		= sensor_s_parm,
> +	.g_parm		= sensor_g_parm,

Please use the g/s_frame_interval() instead. That's what sub-device drivers
generally use for the purpose.

> +};
> +
> +/* ----------------------------------------------------------------------- */
> +
> +/**
> + * @short Subdev operations registration
> + *
> + */
> +static const struct v4l2_subdev_ops subdev_ops = {
> +	.core			= &sensor_core_ops,
> +	.video			= &sensor_video_ops,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * V4L2 subdev internal operations
> + */
> +
> +/**
> + * @short Detect camera version and model
> + * @param[in] sd v4l2 subdev
> + * @return Error code
> + */
> +int ov5647_detect(struct v4l2_subdev *sd)
> +{
> +	unsigned char v;
> +	int ret;
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> +	ret = ov5647_write(sd, OV5647_SW_RESET, 0x01);
> +	if (ret < 0)
> +		return ret;
> +	ret = ov5647_read(sd, OV5647_REG_CHIPID_H, &v);
> +	if (ret < 0)
> +		return ret;
> +	if (v != 0x56) {
> +		dev_err(&client->dev, "Wrong model version detected");
> +		return -ENODEV;
> +	}
> +	ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &v);
> +	if (ret < 0)
> +		return ret;
> +	if (v != 0x47) {
> +		dev_err(&client->dev, "Wrong model version detected");
> +		return -ENODEV;
> +	}
> +
> +	ret = ov5647_write(sd, OV5647_SW_RESET, 0x00);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +/**
> + * @short Detect if camera is registered
> + * @param[in] sd v4l2 subdev
> + * @return Error code
> + */
> +static int ov5647_registered(struct v4l2_subdev *sd)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> +	dev_info(&client->dev, "OV5647 detected at address 0x%02x\n",
> +				client->addr);

I might omit this. If there's a need to debug this then the information
should be printed by the framework instead using debug level messages.

> +
> +	return 0;
> +}
> +
> +/**
> + * @short Open device
> + * @param[in] sd v4l2 subdev
> + * @param[in] fh v4l2 file handler
> + * @return Error code
> + */
> +static int ov5647_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> +	struct v4l2_mbus_framefmt *format =
> +				v4l2_subdev_get_try_format(sd, fh->pad, 0);
> +	struct v4l2_rect *crop =
> +				v4l2_subdev_get_try_crop(sd, fh->pad, 0);
> +
> +	crop->left = OV5647_COLUMN_START_DEF;
> +	crop->top = OV5647_ROW_START_DEF;
> +	crop->width = OV5647_WINDOW_WIDTH_DEF;
> +	crop->height = OV5647_WINDOW_HEIGHT_DEF;
> +
> +	format->code = MEDIA_BUS_FMT_SBGGR8_1X8;
> +
> +	format->width = OV5647_WINDOW_WIDTH_DEF;
> +	format->height = OV5647_WINDOW_HEIGHT_DEF;
> +	format->field = V4L2_FIELD_NONE;
> +	format->colorspace = V4L2_COLORSPACE_SRGB;
> +
> +	return sensor_power(sd, true);
> +}
> +
> +/**
> + * @short Open device
> + * @param[in] sd v4l2 subdev
> + * @param[in] fh v4l2 file handler
> + * @return Error code
> + */
> +static int ov5647_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> +	return sensor_power(sd, false);
> +}
> +
> +/**
> + * @short Subdev internal operations registration
> + *
> + */
> +static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
> +	.registered = ov5647_registered,
> +	.open = ov5647_open,
> +	.close = ov5647_close,
> +};
> +
> +/**
> + * @short Initialization routine - Entry point of the driver
> + * @param[in] client pointer to the i2c client structure
> + * @param[in] id pointer to the i2c device id structure
> + * @return 0 on success and a negative number on failure
> + */
> +static int ov5647_probe(struct i2c_client *client,
> +			const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	struct ov5647 *sensor;
> +	int ret = 0;

No need to initialise ret here.

> +	struct v4l2_subdev *sd;
> +
> +	dev_info(&client->dev, "Installing OmniVision OV5647 camera driver\n");
> +
> +	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
> +	if (sensor == NULL)
> +		return -ENOMEM;
> +
> +	mutex_init(&sensor->lock);
> +	sensor->dev = dev;
> +
> +	sd = &sensor->sd;
> +	v4l2_i2c_subdev_init(sd, client, &subdev_ops);
> +	sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +
> +	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +	ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
> +	if (ret < 0)
> +		goto mutex_remove;
> +
> +	ret = ov5647_detect(sd);
> +	if (ret < 0)
> +		goto error;
> +
> +	ret = v4l2_async_register_subdev(sd);
> +	if (ret < 0)
> +		goto error;
> +
> +	return 0;
> +error:
> +	media_entity_cleanup(&sd->entity);
> +mutex_remove:
> +	mutex_destroy(&sensor->lock);
> +	return ret;
> +}
> +
> +/**
> + * @short Exit routine - Exit point of the driver
> + * @param[in] client pointer to the i2c client structure
> + * @return 0 on success and a negative number on failure
> + */
> +static int ov5647_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov5647 *ov5647 = to_state(sd);
> +
> +	v4l2_async_unregister_subdev(&ov5647->sd);
> +	media_entity_cleanup(&ov5647->sd.entity);
> +	v4l2_device_unregister_subdev(sd);
> +	mutex_destroy(&ov5647->lock);
> +
> +	return 0;
> +}
> +
> +static const struct i2c_device_id ov5647_id[] = {
> +	{ "ov5647", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, ov5647_id);
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id ov5647_of_match[] = {
> +	{ .compatible = "ovti,ov5647" },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, ov5647_of_match);
> +#endif
> +
> +/**
> + * @short i2c driver structure
> + */
> +static struct i2c_driver ov5647_driver = {
> +	.driver = {
> +		.of_match_table = of_match_ptr(ov5647_of_match),
> +		.owner	= THIS_MODULE,
> +		.name	= "ov5647",
> +	},
> +	.probe		= ov5647_probe,
> +	.remove		= ov5647_remove,
> +	.id_table	= ov5647_id,
> +};
> +
> +module_i2c_driver(ov5647_driver);
> +
> +MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
> +MODULE_DESCRIPTION("A low-level driver for OmniVision ov5647 sensors");
> +MODULE_LICENSE("GPL v2");

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi	XMPP: sailus@retiisi.org.uk

Re: [PATCH v5 2/2] Add support for OV5647 sensor

[Ramiro Oliveira]

Hi Sakari

On 12/7/2016 11:01 PM, Sakari Ailus wrote:
> Hi Ramiro,
> 
> On Mon, Dec 05, 2016 at 05:36:34PM +0000, Ramiro Oliveira wrote:
>> Add support for OV5647 sensor.
>>
>> Modes supported:
>>  - 640x480 RAW 8
>>
>> Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
>> ---
>>  MAINTAINERS                |   7 +
>>  drivers/media/i2c/Kconfig  |  12 +
>>  drivers/media/i2c/Makefile |   1 +
>>  drivers/media/i2c/ov5647.c | 866 +++++++++++++++++++++++++++++++++++++++++++++
>>  4 files changed, 886 insertions(+)
>>  create mode 100644 drivers/media/i2c/ov5647.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 52cc077..72e828a 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -8923,6 +8923,13 @@ M:	Harald Welte <laforge-TgoAw6mPHtdg9hUCZPvPmw@public.gmane.org>
>>  S:	Maintained
>>  F:	drivers/char/pcmcia/cm4040_cs.*
>>  
>> +OMNIVISION OV5647 SENSOR DRIVER
>> +M:	Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
>> +L:	linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> +T:	git git://linuxtv.org/media_tree.git
>> +S:	Maintained
>> +F:	drivers/media/i2c/ov5647.c
>> +
>>  OMNIVISION OV7670 SENSOR DRIVER
>>  M:	Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>
>>  L:	linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
>> index b31fa6f..c1b78e5 100644
>> --- a/drivers/media/i2c/Kconfig
>> +++ b/drivers/media/i2c/Kconfig
>> @@ -531,6 +531,18 @@ config VIDEO_OV2659
>>  	  To compile this driver as a module, choose M here: the
>>  	  module will be called ov2659.
>>  
>> +config VIDEO_OV5647
>> +	tristate "OmniVision OV5647 sensor support"
>> +	depends on OF
> 
> How does this driver depend on OF, other than matching the compatible
> string?
> 

It doesn't, should I proceed diferently?

>> +	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
>> +	depends on MEDIA_CAMERA_SUPPORT
>> +	---help---
>> +	  This is a Video4Linux2 sensor-level driver for the OmniVision
>> +	  OV5647 camera.
>> +
>> +	  To compile this driver as a module, choose M here: the
>> +	  module will be called ov5647.
>> +
>>  config VIDEO_OV7640
>>  	tristate "OmniVision OV7640 sensor support"
>>  	depends on I2C && VIDEO_V4L2
>> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
>> index 92773b2..0d9014c 100644
>> --- a/drivers/media/i2c/Makefile
>> +++ b/drivers/media/i2c/Makefile
>> @@ -82,3 +82,4 @@ obj-$(CONFIG_VIDEO_IR_I2C)  += ir-kbd-i2c.o
>>  obj-$(CONFIG_VIDEO_ML86V7667)	+= ml86v7667.o
>>  obj-$(CONFIG_VIDEO_OV2659)	+= ov2659.o
>>  obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
>> +obj-$(CONFIG_VIDEO_OV5647)	+= ov5647.o
>> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
>> new file mode 100644
>> index 0000000..2aae806
>> --- /dev/null
>> +++ b/drivers/media/i2c/ov5647.c
>> @@ -0,0 +1,866 @@
>> +/*
>> + * A V4L2 driver for OmniVision OV5647 cameras.
>> + *
>> + * Based on Samsung S5K6AAFX SXGA 1/6" 1.3M CMOS Image Sensor driver
>> + * Copyright (C) 2011 Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
>> + *
>> + * Based on Omnivision OV7670 Camera Driver
>> + * Copyright (C) 2006-7 Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>
>> + *
>> + * Copyright (C) 2016, Synopsys, Inc.
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +#include <linux/init.h>
>> +#include <linux/module.h>
>> +#include <linux/slab.h>
>> +#include <linux/i2c.h>
>> +#include <linux/delay.h>
>> +#include <linux/videodev2.h>
>> +#include <media/v4l2-device.h>
>> +#include <media/v4l2-ctrls.h>
>> +#include <media/v4l2-mediabus.h>
>> +#include <media/v4l2-image-sizes.h>
>> +#include <media/v4l2-of.h>
>> +#include <linux/io.h>
> 
> Alphabetical order, please.
> 
>> +
>> +#define SENSOR_NAME "ov5647"
>> +
>> +#define OV5647_SW_RESET		0x1003
>> +#define OV5647_REG_CHIPID_H	0x300A
>> +#define OV5647_REG_CHIPID_L	0x300B
>> +
>> +#define REG_TERM 0xfffe
>> +#define VAL_TERM 0xfe
>> +#define REG_DLY  0xffff
>> +
>> +#define OV5647_ROW_START		0x01
>> +#define OV5647_ROW_START_MIN		0
>> +#define OV5647_ROW_START_MAX		2004
>> +#define OV5647_ROW_START_DEF		54
>> +
>> +#define OV5647_COLUMN_START		0x02
>> +#define OV5647_COLUMN_START_MIN		0
>> +#define OV5647_COLUMN_START_MAX		2750
>> +#define OV5647_COLUMN_START_DEF		16
>> +
>> +#define OV5647_WINDOW_HEIGHT		0x03
>> +#define OV5647_WINDOW_HEIGHT_MIN	2
>> +#define OV5647_WINDOW_HEIGHT_MAX	2006
>> +#define OV5647_WINDOW_HEIGHT_DEF	1944
>> +
>> +#define OV5647_WINDOW_WIDTH		0x04
>> +#define OV5647_WINDOW_WIDTH_MIN		2
>> +#define OV5647_WINDOW_WIDTH_MAX		2752
>> +#define OV5647_WINDOW_WIDTH_DEF		2592
>> +
>> +struct regval_list {
>> +	u16 addr;
>> +	u8 data;
>> +};
>> +
>> +struct cfg_array {
>> +	struct regval_list *regs;
>> +	int size;
>> +};
>> +
>> +struct sensor_win_size {
>> +	int width;
>> +	int height;
>> +	unsigned int hoffset;
>> +	unsigned int voffset;
>> +	unsigned int hts;
>> +	unsigned int vts;
>> +	unsigned int pclk;
>> +	unsigned int mipi_bps;
>> +	unsigned int fps_fixed;
>> +	unsigned int bin_factor;
>> +	unsigned int intg_min;
>> +	unsigned int intg_max;
>> +	void *regs;
>> +	int regs_size;
>> +	int (*set_size)(struct v4l2_subdev *sd);
>> +};
>> +
>> +
>> +struct ov5647 {
>> +	struct device			*dev;
>> +	struct v4l2_subdev		sd;
>> +	struct media_pad		pad;
>> +	struct mutex			lock;
>> +	struct v4l2_mbus_framefmt	format;
>> +	struct sensor_format_struct	*fmt;
>> +	unsigned int			width;
>> +	unsigned int			height;
>> +	unsigned int			capture_mode;
>> +	int				hue;
> 
> At least capture_mode and hue are unused. Please remove unused fields.
> 
>> +	struct v4l2_fract		tpf;
>> +	struct sensor_win_size		*current_wins;
>> +};
>> +
>> +static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
>> +{
>> +	return container_of(sd, struct ov5647, sd);
>> +}
>> +
>> +static struct regval_list sensor_oe_disable_regs[] = {
>> +	{0x3000, 0x00},
>> +	{0x3001, 0x00},
>> +	{0x3002, 0x00},
>> +};
>> +
>> +static struct regval_list sensor_oe_enable_regs[] = {
>> +	{0x3000, 0x0f},
>> +	{0x3001, 0xff},
>> +	{0x3002, 0xe4},
>> +};
>> +
>> +static struct regval_list ov5647_640x480[] = {
> 
> Does this list expect a certain external clock frequency? If it does, should
> you check that the actual frequency matches with the expectation?
> 

Yes. But like I said in the DT patch the external clock has a fixed frequency. I
can add a check if you thinks it's better.

>> +	{0x0100, 0x00},
>> +	{0x0103, 0x01},
>> +	{0x3034, 0x08},
>> +	{0x3035, 0x21},
>> +	{0x3036, 0x46},
>> +	{0x303c, 0x11},
>> +	{0x3106, 0xf5},
>> +	{0x3821, 0x07},
>> +	{0x3820, 0x41},
>> +	{0x3827, 0xec},
>> +	{0x370c, 0x0f},
>> +	{0x3612, 0x59},
>> +	{0x3618, 0x00},
>> +	{0x5000, 0x06},
>> +	{0x5001, 0x01},
>> +	{0x5002, 0x41},
>> +	{0x5003, 0x08},
>> +	{0x5a00, 0x08},
>> +	{0x3000, 0x00},
>> +	{0x3001, 0x00},
>> +	{0x3002, 0x00},
>> +	{0x3016, 0x08},
>> +	{0x3017, 0xe0},
>> +	{0x3018, 0x44},
>> +	{0x301c, 0xf8},
>> +	{0x301d, 0xf0},
>> +	{0x3a18, 0x00},
>> +	{0x3a19, 0xf8},
>> +	{0x3c01, 0x80},
>> +	{0x3b07, 0x0c},
>> +	{0x380c, 0x07},
>> +	{0x380d, 0x68},
>> +	{0x380e, 0x03},
>> +	{0x380f, 0xd8},
>> +	{0x3814, 0x31},
>> +	{0x3815, 0x31},
>> +	{0x3708, 0x64},
>> +	{0x3709, 0x52},
>> +	{0x3808, 0x02},
>> +	{0x3809, 0x80},
>> +	{0x380a, 0x01},
>> +	{0x380b, 0xE0},
>> +	{0x3801, 0x00},
>> +	{0x3802, 0x00},
>> +	{0x3803, 0x00},
>> +	{0x3804, 0x0a},
>> +	{0x3805, 0x3f},
>> +	{0x3806, 0x07},
>> +	{0x3807, 0xa1},
>> +	{0x3811, 0x08},
>> +	{0x3813, 0x02},
>> +	{0x3630, 0x2e},
>> +	{0x3632, 0xe2},
>> +	{0x3633, 0x23},
>> +	{0x3634, 0x44},
>> +	{0x3636, 0x06},
>> +	{0x3620, 0x64},
>> +	{0x3621, 0xe0},
>> +	{0x3600, 0x37},
>> +	{0x3704, 0xa0},
>> +	{0x3703, 0x5a},
>> +	{0x3715, 0x78},
>> +	{0x3717, 0x01},
>> +	{0x3731, 0x02},
>> +	{0x370b, 0x60},
>> +	{0x3705, 0x1a},
>> +	{0x3f05, 0x02},
>> +	{0x3f06, 0x10},
>> +	{0x3f01, 0x0a},
>> +	{0x3a08, 0x01},
>> +	{0x3a09, 0x27},
>> +	{0x3a0a, 0x00},
>> +	{0x3a0b, 0xf6},
>> +	{0x3a0d, 0x04},
>> +	{0x3a0e, 0x03},
>> +	{0x3a0f, 0x58},
>> +	{0x3a10, 0x50},
>> +	{0x3a1b, 0x58},
>> +	{0x3a1e, 0x50},
>> +	{0x3a11, 0x60},
>> +	{0x3a1f, 0x28},
>> +	{0x4001, 0x02},
>> +	{0x4004, 0x02},
>> +	{0x4000, 0x09},
>> +	{0x4837, 0x24},
>> +	{0x4050, 0x6e},
>> +	{0x4051, 0x8f},
>> +	{0x0100, 0x01},
>> +};
>> +
>> +struct sensor_format_struct;
>> +
>> +/**
>> + * @short I2C Write operation
>> + * @param[in] i2c_client I2C client
>> + * @param[in] reg register address
>> + * @param[in] val value to write
>> + * @return Error code
>> + */
>> +static int ov5647_write(struct v4l2_subdev *sd, u16 reg, u8 val)
>> +{
>> +	int ret;
>> +	unsigned char data[3] = { reg >> 8, reg & 0xff, val};
>> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> +
>> +	ret = i2c_master_send(client, data, 3);
>> +	if (ret != 3) {
>> +		dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
>> +				__func__, reg);
>> +		return ret < 0 ? ret : -EIO;
>> +	}
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short I2C Read operation
>> + * @param[in] i2c_client I2C client
>> + * @param[in] reg register address
>> + * @param[out] val value read
>> + * @return Error code
>> + */
>> +static int ov5647_read(struct v4l2_subdev *sd, u16 reg, u8 *val)
>> +{
>> +	int ret;
>> +	unsigned char data_w[2] = { reg >> 8, reg & 0xff };
>> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> +
>> +
>> +	ret = i2c_master_send(client, data_w, 2);
>> +
>> +	if (ret < 2) {
>> +		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
>> +			__func__, reg);
>> +		return ret < 0 ? ret : -EIO;
>> +	}
>> +
>> +
>> +	ret = i2c_master_recv(client, val, 1);
>> +
>> +	if (ret < 1) {
>> +		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
>> +				__func__, reg);
>> +		return ret < 0 ? ret : -EIO;
>> +	}
>> +	return 0;
>> +}
>> +
>> +static int ov5647_write_array(struct v4l2_subdev *sd,
>> +				struct regval_list *regs, int array_size)
>> +{
>> +	int i = 0;
>> +	int ret = 0;
>> +
>> +	if (!regs)
>> +		return -EINVAL;
>> +
>> +	while (i < array_size) {
>> +		ret = ov5647_write(sd, regs->addr, regs->data);
>> +		if (ret < 0)
>> +			return ret;
>> +		i++;
>> +		regs++;
>> +	}
>> +	return 0;
>> +}
>> +
>> +static void ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
>> +{
>> +	u8 channel_id;
>> +
>> +	ov5647_read(sd, 0x4814, &channel_id);
>> +	channel_id &= ~(3 << 6);
>> +	ov5647_write(sd, 0x4814, channel_id | (channel << 6));
>> +}
>> +
>> +void ov5647_stream_on(struct v4l2_subdev *sd)
>> +{
>> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> +
>> +	ov5647_write(sd, 0x4202, 0x00);
>> +	dev_dbg(&client->dev, "Stream on");
>> +	ov5647_write(sd, 0x300D, 0x00);
>> +}
>> +
>> +void ov5647_stream_off(struct v4l2_subdev *sd)
>> +{
>> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> +
>> +	ov5647_write(sd, 0x4202, 0x0f);
>> +	dev_dbg(&client->dev, "Stream off");
>> +	ov5647_write(sd, 0x300D, 0x01);
>> +}
>> +
>> +/****************************************************************************/
>> +
>> +/**
>> + * @short Set SW standby
>> + * @param[in] sd v4l2 sd
>> + * @param[in] stanby standby mode status (on or off)
>> + * @return Error code
>> + */
>> +static int set_sw_standby(struct v4l2_subdev *sd, bool standby)
>> +{
>> +	int ret;
>> +	unsigned char rdval;
>> +
>> +	ret = ov5647_read(sd, 0x0100, &rdval);
>> +	if (ret != 0)
>> +		return ret;
>> +
>> +	if (standby)
>> +		rdval &= 0xfe;
>> +	else
>> +		rdval |= 0x01;
>> +
>> +	ret = ov5647_write(sd, 0x0100, rdval);
>> +
>> +	return ret;
>> +}
>> +
>> +/**
>> + * @short Store information about the video data format.
>> + */
>> +static struct sensor_format_struct {
>> +	u8 *desc;
>> +	u32 mbus_code;
>> +	struct regval_list *regs;
>> +	int regs_size;
>> +	int bpp;
> 
> At least desc and bpp are unused.
> 
>> +} sensor_formats[] = {
>> +	{
>> +		.desc		= "Raw RGB Bayer",
>> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
>> +		.regs		= ov5647_640x480,
>> +		.regs_size	= ARRAY_SIZE(ov5647_640x480),
>> +		.bpp		= 1
>> +	},
>> +};
>> +#define N_FMTS ARRAY_SIZE(sensor_formats)
>> +
>> +/* ----------------------------------------------------------------------- */
>> +
>> +/**
>> + * @short Initialize sensor
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] val not used
>> + * @return Error code
>> + */
>> +static int __sensor_init(struct v4l2_subdev *sd)
>> +{
>> +	int ret;
>> +	u8 resetval;
>> +	u8 rdval;
>> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> +
>> +	dev_dbg(&client->dev, "sensor init\n");
>> +
>> +	ret = ov5647_read(sd, 0x0100, &rdval);
>> +	if (ret != 0)
>> +		return ret;
>> +
>> +	ov5647_write(sd, 0x4800, 0x25);
>> +	ov5647_stream_off(sd);
>> +
>> +	ret = ov5647_write_array(sd, ov5647_640x480,
>> +					ARRAY_SIZE(ov5647_640x480));
>> +	if (ret < 0) {
>> +		dev_err(&client->dev, "write sensor_default_regs error\n");
>> +		return ret;
>> +	}
>> +
>> +	ov5647_set_virtual_channel(sd, 0);
>> +
>> +	ov5647_read(sd, 0x0100, &resetval);
>> +	if (!(resetval & 0x01)) {
>> +		dev_err(&client->dev, "Device was in SW standby");
>> +		ov5647_write(sd, 0x0100, 0x01);
>> +	}
>> +
>> +	ov5647_write(sd, 0x4800, 0x04);
>> +	ov5647_stream_on(sd);
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short Control sensor power state
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] on Sensor power
>> + * @return Error code
>> + */
>> +static int sensor_power(struct v4l2_subdev *sd, int on)
>> +{
>> +	int ret;
>> +	struct ov5647 *ov5647 = to_state(sd);
>> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> +
>> +	ret = 0;
>> +	mutex_lock(&ov5647->lock);
>> +
>> +	if (on)	{
>> +		dev_dbg(&client->dev, "OV5647 power on\n");
>> +
>> +		ret = ov5647_write_array(sd, sensor_oe_enable_regs,
>> +				ARRAY_SIZE(sensor_oe_enable_regs));
>> +
>> +		ret = __sensor_init(sd);
>> +
>> +		if (ret < 0)
>> +			dev_err(&client->dev,
>> +				"Camera not available, check Power\n");
>> +	} else {
>> +		dev_dbg(&client->dev, "OV5647 power off\n");
>> +
>> +		dev_dbg(&client->dev, "disable oe\n");
>> +		ret = ov5647_write_array(sd, sensor_oe_disable_regs,
>> +				ARRAY_SIZE(sensor_oe_disable_regs));
>> +
>> +		if (ret < 0)
>> +			dev_dbg(&client->dev, "disable oe failed\n");
>> +
>> +		ret = set_sw_standby(sd, true);
>> +
>> +		if (ret < 0)
>> +			dev_dbg(&client->dev, "soft stby failed\n");
>> +
>> +	}
>> +
>> +	mutex_unlock(&ov5647->lock);
>> +
>> +	return ret;
>> +}
>> +
>> +#ifdef CONFIG_VIDEO_ADV_DEBUG
>> +/**
>> + * @short Get register value
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] reg register struct
>> + * @return Error code
>> + */
>> +static int sensor_get_register(struct v4l2_subdev *sd,
>> +				struct v4l2_dbg_register *reg)
>> +{
>> +	unsigned char val = 0;
>> +	int ret;
>> +
>> +	ret = ov5647_read(sd, reg->reg & 0xff, &val);
>> +	if (ret != 0)
>> +		return ret;
>> +
>> +	reg->val = val;
>> +	reg->size = 1;
>> +
>> +	return ret;
>> +}
>> +
>> +/**
>> + * @short Set register value
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] reg register struct
>> + * @return Error code
>> + */
>> +static int sensor_set_register(struct v4l2_subdev *sd,
>> +				const struct v4l2_dbg_register *reg)
>> +{
>> +	return ov5647_write(sd, reg->reg & 0xff, reg->val & 0xff);
>> +}
>> +#endif
>> +
>> +/* ----------------------------------------------------------------------- */
>> +
>> +/**
>> + * @short Subdev core operations registration
>> + */
>> +static const struct v4l2_subdev_core_ops sensor_core_ops = {
>> +	.s_power		= sensor_power,
> 
> The s_power() op will be called by the bridge (ISP) driver as well. You
> should expect that it may be enabled more than once before being disabled
> equal number of times.
> 

Should I add an IF check to verify if the sensor is powered on before running
the power on/off routine.

>> +#ifdef CONFIG_VIDEO_ADV_DEBUG
>> +	.g_register		= sensor_get_register,
>> +	.s_register		= sensor_set_register,
>> +#endif
>> +};
>> +
>> +/* ----------------------------------------------------------------------- */
>> +
>> +
>> +
>> +/**
>> + * @short Enumerate available image formats
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] index index
>> + * @param[in] code MBUS Pixel code
>> + * @return Error code
>> + */
>> +static int sensor_enum_fmt(struct v4l2_subdev *sd,
>> +		struct v4l2_subdev_pad_config *cfg,
>> +		struct v4l2_subdev_mbus_code_enum *code)
>> +{
>> +	if (code->pad || code->index >= N_FMTS)
>> +		return -EINVAL;
>> +
>> +	code->code = sensor_formats[code->index].mbus_code;
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short Try frame format internal function
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] fmt frame format
>> + * @return Error code
>> + */
>> +static int sensor_try_fmt_internal(struct v4l2_subdev *sd,
>> +	struct v4l2_mbus_framefmt *fmt, struct sensor_format_struct **ret_fmt,
>> +	struct sensor_win_size **ret_wsize)
>> +{
>> +	int index;
>> +
>> +	for (index = 0; index < N_FMTS; index++)
>> +		if (sensor_formats[index].mbus_code == fmt->code)
>> +			break;
>> +
>> +	if (index >= N_FMTS)
>> +		return -EINVAL;
>> +
>> +	if (ret_fmt != NULL)
>> +		*ret_fmt = sensor_formats + index;
>> +
>> +	fmt->field = V4L2_FIELD_NONE;
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short Set frame format
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] fmt frame format
>> + * @return Error code
>> + */
>> +static int sensor_s_fmt(struct v4l2_subdev *sd,
>> +		struct v4l2_subdev_pad_config *cfg,
>> +		struct v4l2_subdev_format *fmt)
>> +{
>> +	int ret;
>> +	struct sensor_format_struct *sensor_fmt;
>> +	struct sensor_win_size *wsize;
>> +	struct ov5647 *info = to_state(sd);
>> +
>> +	ov5647_write_array(sd, sensor_oe_disable_regs,
>> +					ARRAY_SIZE(sensor_oe_disable_regs));
> 
> Should you check the error code here?
> 
>> +
>> +	ret = sensor_try_fmt_internal(sd, &fmt->format,
>> +					&sensor_fmt, &wsize);
> 
> Do you set wsize somewhere?
> 
>> +	if (ret)
>> +		return ret;
>> +
>> +	ov5647_write_array(sd, sensor_fmt->regs, sensor_fmt->regs_size);
> 
> And here.
> 
>> +
>> +	ret = 0;
> 
> ret was already zero.
> 
>> +
>> +	if (wsize->regs)
>> +		ov5647_write_array(sd, wsize->regs, wsize->regs_size);
>> +
>> +	if (wsize->set_size)
>> +		wsize->set_size(sd);
>> +
>> +	info->fmt = sensor_fmt;
>> +	info->width = wsize->width;
>> +	info->height = wsize->height;
>> +
>> +	ov5647_write_array(sd, sensor_oe_enable_regs,
>> +				ARRAY_SIZE(sensor_oe_enable_regs));
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short Set stream parameters
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] parms stream parameters
>> + * @return Error code
>> + */
>> +static int sensor_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
>> +{
>> +	struct v4l2_captureparm *cp = &parms->parm.capture;
>> +	struct ov5647 *info = to_state(sd);
>> +
>> +	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
>> +		return -EINVAL;
>> +
>> +	if (info->tpf.numerator == 0)
>> +		return -EINVAL;
>> +
>> +	info->capture_mode = cp->capturemode;
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short Get stream parameters
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] parms stream parameters
>> + * @return Error code
>> + */
>> +static int sensor_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
>> +{
>> +	struct v4l2_captureparm *cp = &parms->parm.capture;
>> +	struct ov5647 *info = to_state(sd);
>> +
>> +	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
>> +		return -EINVAL;
>> +
>> +	memset(cp, 0, sizeof(struct v4l2_captureparm));
>> +	cp->capability = V4L2_CAP_TIMEPERFRAME;
>> +	cp->capturemode = info->capture_mode;
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short Subdev video operations registration
>> + *
>> + */
>> +static const struct v4l2_subdev_video_ops sensor_video_ops = {
>> +	.s_parm		= sensor_s_parm,
>> +	.g_parm		= sensor_g_parm,
> 
> Please use the g/s_frame_interval() instead. That's what sub-device drivers
> generally use for the purpose.
> 
>> +};
>> +
>> +/* ----------------------------------------------------------------------- */
>> +
>> +/**
>> + * @short Subdev operations registration
>> + *
>> + */
>> +static const struct v4l2_subdev_ops subdev_ops = {
>> +	.core			= &sensor_core_ops,
>> +	.video			= &sensor_video_ops,
>> +};
>> +
>> +/* -----------------------------------------------------------------------------
>> + * V4L2 subdev internal operations
>> + */
>> +
>> +/**
>> + * @short Detect camera version and model
>> + * @param[in] sd v4l2 subdev
>> + * @return Error code
>> + */
>> +int ov5647_detect(struct v4l2_subdev *sd)
>> +{
>> +	unsigned char v;
>> +	int ret;
>> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> +
>> +	ret = ov5647_write(sd, OV5647_SW_RESET, 0x01);
>> +	if (ret < 0)
>> +		return ret;
>> +	ret = ov5647_read(sd, OV5647_REG_CHIPID_H, &v);
>> +	if (ret < 0)
>> +		return ret;
>> +	if (v != 0x56) {
>> +		dev_err(&client->dev, "Wrong model version detected");
>> +		return -ENODEV;
>> +	}
>> +	ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &v);
>> +	if (ret < 0)
>> +		return ret;
>> +	if (v != 0x47) {
>> +		dev_err(&client->dev, "Wrong model version detected");
>> +		return -ENODEV;
>> +	}
>> +
>> +	ret = ov5647_write(sd, OV5647_SW_RESET, 0x00);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short Detect if camera is registered
>> + * @param[in] sd v4l2 subdev
>> + * @return Error code
>> + */
>> +static int ov5647_registered(struct v4l2_subdev *sd)
>> +{
>> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> +
>> +	dev_info(&client->dev, "OV5647 detected at address 0x%02x\n",
>> +				client->addr);
> 
> I might omit this. If there's a need to debug this then the information
> should be printed by the framework instead using debug level messages.
> 
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short Open device
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] fh v4l2 file handler
>> + * @return Error code
>> + */
>> +static int ov5647_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
>> +{
>> +	struct v4l2_mbus_framefmt *format =
>> +				v4l2_subdev_get_try_format(sd, fh->pad, 0);
>> +	struct v4l2_rect *crop =
>> +				v4l2_subdev_get_try_crop(sd, fh->pad, 0);
>> +
>> +	crop->left = OV5647_COLUMN_START_DEF;
>> +	crop->top = OV5647_ROW_START_DEF;
>> +	crop->width = OV5647_WINDOW_WIDTH_DEF;
>> +	crop->height = OV5647_WINDOW_HEIGHT_DEF;
>> +
>> +	format->code = MEDIA_BUS_FMT_SBGGR8_1X8;
>> +
>> +	format->width = OV5647_WINDOW_WIDTH_DEF;
>> +	format->height = OV5647_WINDOW_HEIGHT_DEF;
>> +	format->field = V4L2_FIELD_NONE;
>> +	format->colorspace = V4L2_COLORSPACE_SRGB;
>> +
>> +	return sensor_power(sd, true);
>> +}
>> +
>> +/**
>> + * @short Open device
>> + * @param[in] sd v4l2 subdev
>> + * @param[in] fh v4l2 file handler
>> + * @return Error code
>> + */
>> +static int ov5647_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
>> +{
>> +	return sensor_power(sd, false);
>> +}
>> +
>> +/**
>> + * @short Subdev internal operations registration
>> + *
>> + */
>> +static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
>> +	.registered = ov5647_registered,
>> +	.open = ov5647_open,
>> +	.close = ov5647_close,
>> +};
>> +
>> +/**
>> + * @short Initialization routine - Entry point of the driver
>> + * @param[in] client pointer to the i2c client structure
>> + * @param[in] id pointer to the i2c device id structure
>> + * @return 0 on success and a negative number on failure
>> + */
>> +static int ov5647_probe(struct i2c_client *client,
>> +			const struct i2c_device_id *id)
>> +{
>> +	struct device *dev = &client->dev;
>> +	struct ov5647 *sensor;
>> +	int ret = 0;
> 
> No need to initialise ret here.
> 
>> +	struct v4l2_subdev *sd;
>> +
>> +	dev_info(&client->dev, "Installing OmniVision OV5647 camera driver\n");
>> +
>> +	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
>> +	if (sensor == NULL)
>> +		return -ENOMEM;
>> +
>> +	mutex_init(&sensor->lock);
>> +	sensor->dev = dev;
>> +
>> +	sd = &sensor->sd;
>> +	v4l2_i2c_subdev_init(sd, client, &subdev_ops);
>> +	sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
>> +
>> +	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
>> +	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
>> +	ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
>> +	if (ret < 0)
>> +		goto mutex_remove;
>> +
>> +	ret = ov5647_detect(sd);
>> +	if (ret < 0)
>> +		goto error;
>> +
>> +	ret = v4l2_async_register_subdev(sd);
>> +	if (ret < 0)
>> +		goto error;
>> +
>> +	return 0;
>> +error:
>> +	media_entity_cleanup(&sd->entity);
>> +mutex_remove:
>> +	mutex_destroy(&sensor->lock);
>> +	return ret;
>> +}
>> +
>> +/**
>> + * @short Exit routine - Exit point of the driver
>> + * @param[in] client pointer to the i2c client structure
>> + * @return 0 on success and a negative number on failure
>> + */
>> +static int ov5647_remove(struct i2c_client *client)
>> +{
>> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
>> +	struct ov5647 *ov5647 = to_state(sd);
>> +
>> +	v4l2_async_unregister_subdev(&ov5647->sd);
>> +	media_entity_cleanup(&ov5647->sd.entity);
>> +	v4l2_device_unregister_subdev(sd);
>> +	mutex_destroy(&ov5647->lock);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct i2c_device_id ov5647_id[] = {
>> +	{ "ov5647", 0 },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(i2c, ov5647_id);
>> +
>> +#if IS_ENABLED(CONFIG_OF)
>> +static const struct of_device_id ov5647_of_match[] = {
>> +	{ .compatible = "ovti,ov5647" },
>> +	{ /* sentinel */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, ov5647_of_match);
>> +#endif
>> +
>> +/**
>> + * @short i2c driver structure
>> + */
>> +static struct i2c_driver ov5647_driver = {
>> +	.driver = {
>> +		.of_match_table = of_match_ptr(ov5647_of_match),
>> +		.owner	= THIS_MODULE,
>> +		.name	= "ov5647",
>> +	},
>> +	.probe		= ov5647_probe,
>> +	.remove		= ov5647_remove,
>> +	.id_table	= ov5647_id,
>> +};
>> +
>> +module_i2c_driver(ov5647_driver);
>> +
>> +MODULE_AUTHOR("Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>");
>> +MODULE_DESCRIPTION("A low-level driver for OmniVision ov5647 sensors");
>> +MODULE_LICENSE("GPL v2");
> 
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Re: [PATCH v5 2/2] Add support for OV5647 sensor

[Sakari Ailus]

Hi Ramiro,

On Mon, Dec 12, 2016 at 11:39:13AM +0000, Ramiro Oliveira wrote:
> Hi Sakari
> 
> On 12/7/2016 11:01 PM, Sakari Ailus wrote:
> > Hi Ramiro,
> > 
> > On Mon, Dec 05, 2016 at 05:36:34PM +0000, Ramiro Oliveira wrote:
> >> Add support for OV5647 sensor.
> >>
> >> Modes supported:
> >>  - 640x480 RAW 8
> >>
> >> Signed-off-by: Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
> >> ---
> >>  MAINTAINERS                |   7 +
> >>  drivers/media/i2c/Kconfig  |  12 +
> >>  drivers/media/i2c/Makefile |   1 +
> >>  drivers/media/i2c/ov5647.c | 866 +++++++++++++++++++++++++++++++++++++++++++++
> >>  4 files changed, 886 insertions(+)
> >>  create mode 100644 drivers/media/i2c/ov5647.c
> >>
> >> diff --git a/MAINTAINERS b/MAINTAINERS
> >> index 52cc077..72e828a 100644
> >> --- a/MAINTAINERS
> >> +++ b/MAINTAINERS
> >> @@ -8923,6 +8923,13 @@ M:	Harald Welte <laforge-TgoAw6mPHtdg9hUCZPvPmw@public.gmane.org>
> >>  S:	Maintained
> >>  F:	drivers/char/pcmcia/cm4040_cs.*
> >>  
> >> +OMNIVISION OV5647 SENSOR DRIVER
> >> +M:	Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
> >> +L:	linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> >> +T:	git git://linuxtv.org/media_tree.git
> >> +S:	Maintained
> >> +F:	drivers/media/i2c/ov5647.c
> >> +
> >>  OMNIVISION OV7670 SENSOR DRIVER
> >>  M:	Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>
> >>  L:	linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> >> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> >> index b31fa6f..c1b78e5 100644
> >> --- a/drivers/media/i2c/Kconfig
> >> +++ b/drivers/media/i2c/Kconfig
> >> @@ -531,6 +531,18 @@ config VIDEO_OV2659
> >>  	  To compile this driver as a module, choose M here: the
> >>  	  module will be called ov2659.
> >>  
> >> +config VIDEO_OV5647
> >> +	tristate "OmniVision OV5647 sensor support"
> >> +	depends on OF
> > 
> > How does this driver depend on OF, other than matching the compatible
> > string?
> > 
> 
> It doesn't, should I proceed diferently?

You should drop the dependency if you don't need it. But I bet you will
actually need it.

> 
> >> +	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> >> +	depends on MEDIA_CAMERA_SUPPORT
> >> +	---help---
> >> +	  This is a Video4Linux2 sensor-level driver for the OmniVision
> >> +	  OV5647 camera.
> >> +
> >> +	  To compile this driver as a module, choose M here: the
> >> +	  module will be called ov5647.
> >> +
> >>  config VIDEO_OV7640
> >>  	tristate "OmniVision OV7640 sensor support"
> >>  	depends on I2C && VIDEO_V4L2
> >> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> >> index 92773b2..0d9014c 100644
> >> --- a/drivers/media/i2c/Makefile
> >> +++ b/drivers/media/i2c/Makefile
> >> @@ -82,3 +82,4 @@ obj-$(CONFIG_VIDEO_IR_I2C)  += ir-kbd-i2c.o
> >>  obj-$(CONFIG_VIDEO_ML86V7667)	+= ml86v7667.o
> >>  obj-$(CONFIG_VIDEO_OV2659)	+= ov2659.o
> >>  obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
> >> +obj-$(CONFIG_VIDEO_OV5647)	+= ov5647.o
> >> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
> >> new file mode 100644
> >> index 0000000..2aae806
> >> --- /dev/null
> >> +++ b/drivers/media/i2c/ov5647.c
> >> @@ -0,0 +1,866 @@
> >> +/*
> >> + * A V4L2 driver for OmniVision OV5647 cameras.
> >> + *
> >> + * Based on Samsung S5K6AAFX SXGA 1/6" 1.3M CMOS Image Sensor driver
> >> + * Copyright (C) 2011 Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> >> + *
> >> + * Based on Omnivision OV7670 Camera Driver
> >> + * Copyright (C) 2006-7 Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>
> >> + *
> >> + * Copyright (C) 2016, Synopsys, Inc.
> >> + *
> >> + * This program is free software; you can redistribute it and/or
> >> + * modify it under the terms of the GNU General Public License as
> >> + * published by the Free Software Foundation version 2.
> >> + *
> >> + * This program is distributed .as is. WITHOUT ANY WARRANTY of any
> >> + * kind, whether express or implied; without even the implied warranty
> >> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + */
> >> +#include <linux/init.h>
> >> +#include <linux/module.h>
> >> +#include <linux/slab.h>
> >> +#include <linux/i2c.h>
> >> +#include <linux/delay.h>
> >> +#include <linux/videodev2.h>
> >> +#include <media/v4l2-device.h>
> >> +#include <media/v4l2-ctrls.h>
> >> +#include <media/v4l2-mediabus.h>
> >> +#include <media/v4l2-image-sizes.h>
> >> +#include <media/v4l2-of.h>
> >> +#include <linux/io.h>
> > 
> > Alphabetical order, please.
> > 
> >> +
> >> +#define SENSOR_NAME "ov5647"
> >> +
> >> +#define OV5647_SW_RESET		0x1003
> >> +#define OV5647_REG_CHIPID_H	0x300A
> >> +#define OV5647_REG_CHIPID_L	0x300B
> >> +
> >> +#define REG_TERM 0xfffe
> >> +#define VAL_TERM 0xfe
> >> +#define REG_DLY  0xffff
> >> +
> >> +#define OV5647_ROW_START		0x01
> >> +#define OV5647_ROW_START_MIN		0
> >> +#define OV5647_ROW_START_MAX		2004
> >> +#define OV5647_ROW_START_DEF		54
> >> +
> >> +#define OV5647_COLUMN_START		0x02
> >> +#define OV5647_COLUMN_START_MIN		0
> >> +#define OV5647_COLUMN_START_MAX		2750
> >> +#define OV5647_COLUMN_START_DEF		16
> >> +
> >> +#define OV5647_WINDOW_HEIGHT		0x03
> >> +#define OV5647_WINDOW_HEIGHT_MIN	2
> >> +#define OV5647_WINDOW_HEIGHT_MAX	2006
> >> +#define OV5647_WINDOW_HEIGHT_DEF	1944
> >> +
> >> +#define OV5647_WINDOW_WIDTH		0x04
> >> +#define OV5647_WINDOW_WIDTH_MIN		2
> >> +#define OV5647_WINDOW_WIDTH_MAX		2752
> >> +#define OV5647_WINDOW_WIDTH_DEF		2592
> >> +
> >> +struct regval_list {
> >> +	u16 addr;
> >> +	u8 data;
> >> +};
> >> +
> >> +struct cfg_array {
> >> +	struct regval_list *regs;
> >> +	int size;
> >> +};
> >> +
> >> +struct sensor_win_size {
> >> +	int width;
> >> +	int height;
> >> +	unsigned int hoffset;
> >> +	unsigned int voffset;
> >> +	unsigned int hts;
> >> +	unsigned int vts;
> >> +	unsigned int pclk;
> >> +	unsigned int mipi_bps;
> >> +	unsigned int fps_fixed;
> >> +	unsigned int bin_factor;
> >> +	unsigned int intg_min;
> >> +	unsigned int intg_max;
> >> +	void *regs;
> >> +	int regs_size;
> >> +	int (*set_size)(struct v4l2_subdev *sd);
> >> +};
> >> +
> >> +
> >> +struct ov5647 {
> >> +	struct device			*dev;
> >> +	struct v4l2_subdev		sd;
> >> +	struct media_pad		pad;
> >> +	struct mutex			lock;
> >> +	struct v4l2_mbus_framefmt	format;
> >> +	struct sensor_format_struct	*fmt;
> >> +	unsigned int			width;
> >> +	unsigned int			height;
> >> +	unsigned int			capture_mode;
> >> +	int				hue;
> > 
> > At least capture_mode and hue are unused. Please remove unused fields.
> > 
> >> +	struct v4l2_fract		tpf;
> >> +	struct sensor_win_size		*current_wins;
> >> +};
> >> +
> >> +static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
> >> +{
> >> +	return container_of(sd, struct ov5647, sd);
> >> +}
> >> +
> >> +static struct regval_list sensor_oe_disable_regs[] = {
> >> +	{0x3000, 0x00},
> >> +	{0x3001, 0x00},
> >> +	{0x3002, 0x00},
> >> +};
> >> +
> >> +static struct regval_list sensor_oe_enable_regs[] = {
> >> +	{0x3000, 0x0f},
> >> +	{0x3001, 0xff},
> >> +	{0x3002, 0xe4},
> >> +};
> >> +
> >> +static struct regval_list ov5647_640x480[] = {
> > 
> > Does this list expect a certain external clock frequency? If it does, should
> > you check that the actual frequency matches with the expectation?
> > 
> 
> Yes. But like I said in the DT patch the external clock has a fixed frequency. I
> can add a check if you thinks it's better.
> 
> >> +	{0x0100, 0x00},
> >> +	{0x0103, 0x01},
> >> +	{0x3034, 0x08},
> >> +	{0x3035, 0x21},
> >> +	{0x3036, 0x46},
> >> +	{0x303c, 0x11},
> >> +	{0x3106, 0xf5},
> >> +	{0x3821, 0x07},
> >> +	{0x3820, 0x41},
> >> +	{0x3827, 0xec},
> >> +	{0x370c, 0x0f},
> >> +	{0x3612, 0x59},
> >> +	{0x3618, 0x00},
> >> +	{0x5000, 0x06},
> >> +	{0x5001, 0x01},
> >> +	{0x5002, 0x41},
> >> +	{0x5003, 0x08},
> >> +	{0x5a00, 0x08},
> >> +	{0x3000, 0x00},
> >> +	{0x3001, 0x00},
> >> +	{0x3002, 0x00},
> >> +	{0x3016, 0x08},
> >> +	{0x3017, 0xe0},
> >> +	{0x3018, 0x44},
> >> +	{0x301c, 0xf8},
> >> +	{0x301d, 0xf0},
> >> +	{0x3a18, 0x00},
> >> +	{0x3a19, 0xf8},
> >> +	{0x3c01, 0x80},
> >> +	{0x3b07, 0x0c},
> >> +	{0x380c, 0x07},
> >> +	{0x380d, 0x68},
> >> +	{0x380e, 0x03},
> >> +	{0x380f, 0xd8},
> >> +	{0x3814, 0x31},
> >> +	{0x3815, 0x31},
> >> +	{0x3708, 0x64},
> >> +	{0x3709, 0x52},
> >> +	{0x3808, 0x02},
> >> +	{0x3809, 0x80},
> >> +	{0x380a, 0x01},
> >> +	{0x380b, 0xE0},
> >> +	{0x3801, 0x00},
> >> +	{0x3802, 0x00},
> >> +	{0x3803, 0x00},
> >> +	{0x3804, 0x0a},
> >> +	{0x3805, 0x3f},
> >> +	{0x3806, 0x07},
> >> +	{0x3807, 0xa1},
> >> +	{0x3811, 0x08},
> >> +	{0x3813, 0x02},
> >> +	{0x3630, 0x2e},
> >> +	{0x3632, 0xe2},
> >> +	{0x3633, 0x23},
> >> +	{0x3634, 0x44},
> >> +	{0x3636, 0x06},
> >> +	{0x3620, 0x64},
> >> +	{0x3621, 0xe0},
> >> +	{0x3600, 0x37},
> >> +	{0x3704, 0xa0},
> >> +	{0x3703, 0x5a},
> >> +	{0x3715, 0x78},
> >> +	{0x3717, 0x01},
> >> +	{0x3731, 0x02},
> >> +	{0x370b, 0x60},
> >> +	{0x3705, 0x1a},
> >> +	{0x3f05, 0x02},
> >> +	{0x3f06, 0x10},
> >> +	{0x3f01, 0x0a},
> >> +	{0x3a08, 0x01},
> >> +	{0x3a09, 0x27},
> >> +	{0x3a0a, 0x00},
> >> +	{0x3a0b, 0xf6},
> >> +	{0x3a0d, 0x04},
> >> +	{0x3a0e, 0x03},
> >> +	{0x3a0f, 0x58},
> >> +	{0x3a10, 0x50},
> >> +	{0x3a1b, 0x58},
> >> +	{0x3a1e, 0x50},
> >> +	{0x3a11, 0x60},
> >> +	{0x3a1f, 0x28},
> >> +	{0x4001, 0x02},
> >> +	{0x4004, 0x02},
> >> +	{0x4000, 0x09},
> >> +	{0x4837, 0x24},
> >> +	{0x4050, 0x6e},
> >> +	{0x4051, 0x8f},
> >> +	{0x0100, 0x01},
> >> +};
> >> +
> >> +struct sensor_format_struct;
> >> +
> >> +/**
> >> + * @short I2C Write operation
> >> + * @param[in] i2c_client I2C client
> >> + * @param[in] reg register address
> >> + * @param[in] val value to write
> >> + * @return Error code
> >> + */
> >> +static int ov5647_write(struct v4l2_subdev *sd, u16 reg, u8 val)
> >> +{
> >> +	int ret;
> >> +	unsigned char data[3] = { reg >> 8, reg & 0xff, val};
> >> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >> +
> >> +	ret = i2c_master_send(client, data, 3);
> >> +	if (ret != 3) {
> >> +		dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
> >> +				__func__, reg);
> >> +		return ret < 0 ? ret : -EIO;
> >> +	}
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short I2C Read operation
> >> + * @param[in] i2c_client I2C client
> >> + * @param[in] reg register address
> >> + * @param[out] val value read
> >> + * @return Error code
> >> + */
> >> +static int ov5647_read(struct v4l2_subdev *sd, u16 reg, u8 *val)
> >> +{
> >> +	int ret;
> >> +	unsigned char data_w[2] = { reg >> 8, reg & 0xff };
> >> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >> +
> >> +
> >> +	ret = i2c_master_send(client, data_w, 2);
> >> +
> >> +	if (ret < 2) {
> >> +		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
> >> +			__func__, reg);
> >> +		return ret < 0 ? ret : -EIO;
> >> +	}
> >> +
> >> +
> >> +	ret = i2c_master_recv(client, val, 1);
> >> +
> >> +	if (ret < 1) {
> >> +		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
> >> +				__func__, reg);
> >> +		return ret < 0 ? ret : -EIO;
> >> +	}
> >> +	return 0;
> >> +}
> >> +
> >> +static int ov5647_write_array(struct v4l2_subdev *sd,
> >> +				struct regval_list *regs, int array_size)
> >> +{
> >> +	int i = 0;
> >> +	int ret = 0;
> >> +
> >> +	if (!regs)
> >> +		return -EINVAL;
> >> +
> >> +	while (i < array_size) {
> >> +		ret = ov5647_write(sd, regs->addr, regs->data);
> >> +		if (ret < 0)
> >> +			return ret;
> >> +		i++;
> >> +		regs++;
> >> +	}
> >> +	return 0;
> >> +}
> >> +
> >> +static void ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
> >> +{
> >> +	u8 channel_id;
> >> +
> >> +	ov5647_read(sd, 0x4814, &channel_id);
> >> +	channel_id &= ~(3 << 6);
> >> +	ov5647_write(sd, 0x4814, channel_id | (channel << 6));
> >> +}
> >> +
> >> +void ov5647_stream_on(struct v4l2_subdev *sd)
> >> +{
> >> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >> +
> >> +	ov5647_write(sd, 0x4202, 0x00);
> >> +	dev_dbg(&client->dev, "Stream on");
> >> +	ov5647_write(sd, 0x300D, 0x00);
> >> +}
> >> +
> >> +void ov5647_stream_off(struct v4l2_subdev *sd)
> >> +{
> >> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >> +
> >> +	ov5647_write(sd, 0x4202, 0x0f);
> >> +	dev_dbg(&client->dev, "Stream off");
> >> +	ov5647_write(sd, 0x300D, 0x01);
> >> +}
> >> +
> >> +/****************************************************************************/
> >> +
> >> +/**
> >> + * @short Set SW standby
> >> + * @param[in] sd v4l2 sd
> >> + * @param[in] stanby standby mode status (on or off)
> >> + * @return Error code
> >> + */
> >> +static int set_sw_standby(struct v4l2_subdev *sd, bool standby)
> >> +{
> >> +	int ret;
> >> +	unsigned char rdval;
> >> +
> >> +	ret = ov5647_read(sd, 0x0100, &rdval);
> >> +	if (ret != 0)
> >> +		return ret;
> >> +
> >> +	if (standby)
> >> +		rdval &= 0xfe;
> >> +	else
> >> +		rdval |= 0x01;
> >> +
> >> +	ret = ov5647_write(sd, 0x0100, rdval);
> >> +
> >> +	return ret;
> >> +}
> >> +
> >> +/**
> >> + * @short Store information about the video data format.
> >> + */
> >> +static struct sensor_format_struct {
> >> +	u8 *desc;
> >> +	u32 mbus_code;
> >> +	struct regval_list *regs;
> >> +	int regs_size;
> >> +	int bpp;
> > 
> > At least desc and bpp are unused.
> > 
> >> +} sensor_formats[] = {
> >> +	{
> >> +		.desc		= "Raw RGB Bayer",
> >> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
> >> +		.regs		= ov5647_640x480,
> >> +		.regs_size	= ARRAY_SIZE(ov5647_640x480),
> >> +		.bpp		= 1
> >> +	},
> >> +};
> >> +#define N_FMTS ARRAY_SIZE(sensor_formats)
> >> +
> >> +/* ----------------------------------------------------------------------- */
> >> +
> >> +/**
> >> + * @short Initialize sensor
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] val not used
> >> + * @return Error code
> >> + */
> >> +static int __sensor_init(struct v4l2_subdev *sd)
> >> +{
> >> +	int ret;
> >> +	u8 resetval;
> >> +	u8 rdval;
> >> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >> +
> >> +	dev_dbg(&client->dev, "sensor init\n");
> >> +
> >> +	ret = ov5647_read(sd, 0x0100, &rdval);
> >> +	if (ret != 0)
> >> +		return ret;
> >> +
> >> +	ov5647_write(sd, 0x4800, 0x25);
> >> +	ov5647_stream_off(sd);
> >> +
> >> +	ret = ov5647_write_array(sd, ov5647_640x480,
> >> +					ARRAY_SIZE(ov5647_640x480));
> >> +	if (ret < 0) {
> >> +		dev_err(&client->dev, "write sensor_default_regs error\n");
> >> +		return ret;
> >> +	}
> >> +
> >> +	ov5647_set_virtual_channel(sd, 0);
> >> +
> >> +	ov5647_read(sd, 0x0100, &resetval);
> >> +	if (!(resetval & 0x01)) {
> >> +		dev_err(&client->dev, "Device was in SW standby");
> >> +		ov5647_write(sd, 0x0100, 0x01);
> >> +	}
> >> +
> >> +	ov5647_write(sd, 0x4800, 0x04);
> >> +	ov5647_stream_on(sd);
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short Control sensor power state
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] on Sensor power
> >> + * @return Error code
> >> + */
> >> +static int sensor_power(struct v4l2_subdev *sd, int on)
> >> +{
> >> +	int ret;
> >> +	struct ov5647 *ov5647 = to_state(sd);
> >> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >> +
> >> +	ret = 0;
> >> +	mutex_lock(&ov5647->lock);
> >> +
> >> +	if (on)	{
> >> +		dev_dbg(&client->dev, "OV5647 power on\n");
> >> +
> >> +		ret = ov5647_write_array(sd, sensor_oe_enable_regs,
> >> +				ARRAY_SIZE(sensor_oe_enable_regs));
> >> +
> >> +		ret = __sensor_init(sd);
> >> +
> >> +		if (ret < 0)
> >> +			dev_err(&client->dev,
> >> +				"Camera not available, check Power\n");
> >> +	} else {
> >> +		dev_dbg(&client->dev, "OV5647 power off\n");
> >> +
> >> +		dev_dbg(&client->dev, "disable oe\n");
> >> +		ret = ov5647_write_array(sd, sensor_oe_disable_regs,
> >> +				ARRAY_SIZE(sensor_oe_disable_regs));
> >> +
> >> +		if (ret < 0)
> >> +			dev_dbg(&client->dev, "disable oe failed\n");
> >> +
> >> +		ret = set_sw_standby(sd, true);
> >> +
> >> +		if (ret < 0)
> >> +			dev_dbg(&client->dev, "soft stby failed\n");
> >> +
> >> +	}
> >> +
> >> +	mutex_unlock(&ov5647->lock);
> >> +
> >> +	return ret;
> >> +}
> >> +
> >> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> >> +/**
> >> + * @short Get register value
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] reg register struct
> >> + * @return Error code
> >> + */
> >> +static int sensor_get_register(struct v4l2_subdev *sd,
> >> +				struct v4l2_dbg_register *reg)
> >> +{
> >> +	unsigned char val = 0;
> >> +	int ret;
> >> +
> >> +	ret = ov5647_read(sd, reg->reg & 0xff, &val);
> >> +	if (ret != 0)
> >> +		return ret;
> >> +
> >> +	reg->val = val;
> >> +	reg->size = 1;
> >> +
> >> +	return ret;
> >> +}
> >> +
> >> +/**
> >> + * @short Set register value
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] reg register struct
> >> + * @return Error code
> >> + */
> >> +static int sensor_set_register(struct v4l2_subdev *sd,
> >> +				const struct v4l2_dbg_register *reg)
> >> +{
> >> +	return ov5647_write(sd, reg->reg & 0xff, reg->val & 0xff);
> >> +}
> >> +#endif
> >> +
> >> +/* ----------------------------------------------------------------------- */
> >> +
> >> +/**
> >> + * @short Subdev core operations registration
> >> + */
> >> +static const struct v4l2_subdev_core_ops sensor_core_ops = {
> >> +	.s_power		= sensor_power,
> > 
> > The s_power() op will be called by the bridge (ISP) driver as well. You
> > should expect that it may be enabled more than once before being disabled
> > equal number of times.
> > 
> 
> Should I add an IF check to verify if the sensor is powered on before running
> the power on/off routine.

You need a counter. One way to do that is in the driver itself, or you can
do what I recently did in the smiapp driver, using runtime PM so you don't
explicitly need to manage it:

<URL:https://git.linuxtv.org/sailus/media_tree.git/tree/drivers/media/i2c/smiapp/smiapp-core.c?h=smiapp-pm&id=c29df33f9ec94226eab8ee92d8c66ab83c76659a>

Or, before the runtime PM conversion:

<URL:https://git.linuxtv.org/sailus/media_tree.git/tree/drivers/media/i2c/smiapp/smiapp-core.c?h=smiapp-pm&id=c8d2bc9bc39ebea8437fd974fdbc21847bb897a3>

The use of runtime PM in sub-device drivers is new and I'm not entirely
happy how it's implemented in the smiapp driver right now, hence it might be
better not to use it (yet). Up to you.

> 
> >> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> >> +	.g_register		= sensor_get_register,
> >> +	.s_register		= sensor_set_register,
> >> +#endif
> >> +};
> >> +
> >> +/* ----------------------------------------------------------------------- */
> >> +
> >> +
> >> +
> >> +/**
> >> + * @short Enumerate available image formats
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] index index
> >> + * @param[in] code MBUS Pixel code
> >> + * @return Error code
> >> + */
> >> +static int sensor_enum_fmt(struct v4l2_subdev *sd,
> >> +		struct v4l2_subdev_pad_config *cfg,
> >> +		struct v4l2_subdev_mbus_code_enum *code)
> >> +{
> >> +	if (code->pad || code->index >= N_FMTS)
> >> +		return -EINVAL;
> >> +
> >> +	code->code = sensor_formats[code->index].mbus_code;
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short Try frame format internal function
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] fmt frame format
> >> + * @return Error code
> >> + */
> >> +static int sensor_try_fmt_internal(struct v4l2_subdev *sd,
> >> +	struct v4l2_mbus_framefmt *fmt, struct sensor_format_struct **ret_fmt,
> >> +	struct sensor_win_size **ret_wsize)
> >> +{
> >> +	int index;
> >> +
> >> +	for (index = 0; index < N_FMTS; index++)
> >> +		if (sensor_formats[index].mbus_code == fmt->code)
> >> +			break;
> >> +
> >> +	if (index >= N_FMTS)
> >> +		return -EINVAL;
> >> +
> >> +	if (ret_fmt != NULL)
> >> +		*ret_fmt = sensor_formats + index;
> >> +
> >> +	fmt->field = V4L2_FIELD_NONE;
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short Set frame format
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] fmt frame format
> >> + * @return Error code
> >> + */
> >> +static int sensor_s_fmt(struct v4l2_subdev *sd,
> >> +		struct v4l2_subdev_pad_config *cfg,
> >> +		struct v4l2_subdev_format *fmt)
> >> +{
> >> +	int ret;
> >> +	struct sensor_format_struct *sensor_fmt;
> >> +	struct sensor_win_size *wsize;
> >> +	struct ov5647 *info = to_state(sd);
> >> +
> >> +	ov5647_write_array(sd, sensor_oe_disable_regs,
> >> +					ARRAY_SIZE(sensor_oe_disable_regs));
> > 
> > Should you check the error code here?
> > 
> >> +
> >> +	ret = sensor_try_fmt_internal(sd, &fmt->format,
> >> +					&sensor_fmt, &wsize);
> > 
> > Do you set wsize somewhere?
> > 
> >> +	if (ret)
> >> +		return ret;
> >> +
> >> +	ov5647_write_array(sd, sensor_fmt->regs, sensor_fmt->regs_size);
> > 
> > And here.
> > 
> >> +
> >> +	ret = 0;
> > 
> > ret was already zero.
> > 
> >> +
> >> +	if (wsize->regs)
> >> +		ov5647_write_array(sd, wsize->regs, wsize->regs_size);
> >> +
> >> +	if (wsize->set_size)
> >> +		wsize->set_size(sd);
> >> +
> >> +	info->fmt = sensor_fmt;
> >> +	info->width = wsize->width;
> >> +	info->height = wsize->height;
> >> +
> >> +	ov5647_write_array(sd, sensor_oe_enable_regs,
> >> +				ARRAY_SIZE(sensor_oe_enable_regs));
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short Set stream parameters
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] parms stream parameters
> >> + * @return Error code
> >> + */
> >> +static int sensor_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
> >> +{
> >> +	struct v4l2_captureparm *cp = &parms->parm.capture;
> >> +	struct ov5647 *info = to_state(sd);
> >> +
> >> +	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> >> +		return -EINVAL;
> >> +
> >> +	if (info->tpf.numerator == 0)
> >> +		return -EINVAL;
> >> +
> >> +	info->capture_mode = cp->capturemode;
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short Get stream parameters
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] parms stream parameters
> >> + * @return Error code
> >> + */
> >> +static int sensor_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
> >> +{
> >> +	struct v4l2_captureparm *cp = &parms->parm.capture;
> >> +	struct ov5647 *info = to_state(sd);
> >> +
> >> +	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> >> +		return -EINVAL;
> >> +
> >> +	memset(cp, 0, sizeof(struct v4l2_captureparm));
> >> +	cp->capability = V4L2_CAP_TIMEPERFRAME;
> >> +	cp->capturemode = info->capture_mode;
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short Subdev video operations registration
> >> + *
> >> + */
> >> +static const struct v4l2_subdev_video_ops sensor_video_ops = {
> >> +	.s_parm		= sensor_s_parm,
> >> +	.g_parm		= sensor_g_parm,
> > 
> > Please use the g/s_frame_interval() instead. That's what sub-device drivers
> > generally use for the purpose.
> > 
> >> +};
> >> +
> >> +/* ----------------------------------------------------------------------- */
> >> +
> >> +/**
> >> + * @short Subdev operations registration
> >> + *
> >> + */
> >> +static const struct v4l2_subdev_ops subdev_ops = {
> >> +	.core			= &sensor_core_ops,
> >> +	.video			= &sensor_video_ops,
> >> +};
> >> +
> >> +/* -----------------------------------------------------------------------------
> >> + * V4L2 subdev internal operations
> >> + */
> >> +
> >> +/**
> >> + * @short Detect camera version and model
> >> + * @param[in] sd v4l2 subdev
> >> + * @return Error code
> >> + */
> >> +int ov5647_detect(struct v4l2_subdev *sd)
> >> +{
> >> +	unsigned char v;
> >> +	int ret;
> >> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >> +
> >> +	ret = ov5647_write(sd, OV5647_SW_RESET, 0x01);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +	ret = ov5647_read(sd, OV5647_REG_CHIPID_H, &v);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +	if (v != 0x56) {
> >> +		dev_err(&client->dev, "Wrong model version detected");
> >> +		return -ENODEV;
> >> +	}
> >> +	ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &v);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +	if (v != 0x47) {
> >> +		dev_err(&client->dev, "Wrong model version detected");
> >> +		return -ENODEV;
> >> +	}
> >> +
> >> +	ret = ov5647_write(sd, OV5647_SW_RESET, 0x00);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short Detect if camera is registered
> >> + * @param[in] sd v4l2 subdev
> >> + * @return Error code
> >> + */
> >> +static int ov5647_registered(struct v4l2_subdev *sd)
> >> +{
> >> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >> +
> >> +	dev_info(&client->dev, "OV5647 detected at address 0x%02x\n",
> >> +				client->addr);
> > 
> > I might omit this. If there's a need to debug this then the information
> > should be printed by the framework instead using debug level messages.
> > 
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +/**
> >> + * @short Open device
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] fh v4l2 file handler
> >> + * @return Error code
> >> + */
> >> +static int ov5647_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> >> +{
> >> +	struct v4l2_mbus_framefmt *format =
> >> +				v4l2_subdev_get_try_format(sd, fh->pad, 0);
> >> +	struct v4l2_rect *crop =
> >> +				v4l2_subdev_get_try_crop(sd, fh->pad, 0);
> >> +
> >> +	crop->left = OV5647_COLUMN_START_DEF;
> >> +	crop->top = OV5647_ROW_START_DEF;
> >> +	crop->width = OV5647_WINDOW_WIDTH_DEF;
> >> +	crop->height = OV5647_WINDOW_HEIGHT_DEF;
> >> +
> >> +	format->code = MEDIA_BUS_FMT_SBGGR8_1X8;
> >> +
> >> +	format->width = OV5647_WINDOW_WIDTH_DEF;
> >> +	format->height = OV5647_WINDOW_HEIGHT_DEF;
> >> +	format->field = V4L2_FIELD_NONE;
> >> +	format->colorspace = V4L2_COLORSPACE_SRGB;
> >> +
> >> +	return sensor_power(sd, true);
> >> +}
> >> +
> >> +/**
> >> + * @short Open device
> >> + * @param[in] sd v4l2 subdev
> >> + * @param[in] fh v4l2 file handler
> >> + * @return Error code
> >> + */
> >> +static int ov5647_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> >> +{
> >> +	return sensor_power(sd, false);
> >> +}
> >> +
> >> +/**
> >> + * @short Subdev internal operations registration
> >> + *
> >> + */
> >> +static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
> >> +	.registered = ov5647_registered,
> >> +	.open = ov5647_open,
> >> +	.close = ov5647_close,
> >> +};
> >> +
> >> +/**
> >> + * @short Initialization routine - Entry point of the driver
> >> + * @param[in] client pointer to the i2c client structure
> >> + * @param[in] id pointer to the i2c device id structure
> >> + * @return 0 on success and a negative number on failure
> >> + */
> >> +static int ov5647_probe(struct i2c_client *client,
> >> +			const struct i2c_device_id *id)
> >> +{
> >> +	struct device *dev = &client->dev;
> >> +	struct ov5647 *sensor;
> >> +	int ret = 0;
> > 
> > No need to initialise ret here.
> > 
> >> +	struct v4l2_subdev *sd;
> >> +
> >> +	dev_info(&client->dev, "Installing OmniVision OV5647 camera driver\n");
> >> +
> >> +	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
> >> +	if (sensor == NULL)
> >> +		return -ENOMEM;
> >> +
> >> +	mutex_init(&sensor->lock);
> >> +	sensor->dev = dev;
> >> +
> >> +	sd = &sensor->sd;
> >> +	v4l2_i2c_subdev_init(sd, client, &subdev_ops);
> >> +	sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> >> +
> >> +	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
> >> +	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
> >> +	ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
> >> +	if (ret < 0)
> >> +		goto mutex_remove;
> >> +
> >> +	ret = ov5647_detect(sd);
> >> +	if (ret < 0)
> >> +		goto error;
> >> +
> >> +	ret = v4l2_async_register_subdev(sd);
> >> +	if (ret < 0)
> >> +		goto error;
> >> +
> >> +	return 0;
> >> +error:
> >> +	media_entity_cleanup(&sd->entity);
> >> +mutex_remove:
> >> +	mutex_destroy(&sensor->lock);
> >> +	return ret;
> >> +}
> >> +
> >> +/**
> >> + * @short Exit routine - Exit point of the driver
> >> + * @param[in] client pointer to the i2c client structure
> >> + * @return 0 on success and a negative number on failure
> >> + */
> >> +static int ov5647_remove(struct i2c_client *client)
> >> +{
> >> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> >> +	struct ov5647 *ov5647 = to_state(sd);
> >> +
> >> +	v4l2_async_unregister_subdev(&ov5647->sd);
> >> +	media_entity_cleanup(&ov5647->sd.entity);
> >> +	v4l2_device_unregister_subdev(sd);
> >> +	mutex_destroy(&ov5647->lock);
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static const struct i2c_device_id ov5647_id[] = {
> >> +	{ "ov5647", 0 },
> >> +	{ }
> >> +};
> >> +MODULE_DEVICE_TABLE(i2c, ov5647_id);
> >> +
> >> +#if IS_ENABLED(CONFIG_OF)
> >> +static const struct of_device_id ov5647_of_match[] = {
> >> +	{ .compatible = "ovti,ov5647" },
> >> +	{ /* sentinel */ },
> >> +};
> >> +MODULE_DEVICE_TABLE(of, ov5647_of_match);
> >> +#endif
> >> +
> >> +/**
> >> + * @short i2c driver structure
> >> + */
> >> +static struct i2c_driver ov5647_driver = {
> >> +	.driver = {
> >> +		.of_match_table = of_match_ptr(ov5647_of_match),
> >> +		.owner	= THIS_MODULE,
> >> +		.name	= "ov5647",
> >> +	},
> >> +	.probe		= ov5647_probe,
> >> +	.remove		= ov5647_remove,
> >> +	.id_table	= ov5647_id,
> >> +};
> >> +
> >> +module_i2c_driver(ov5647_driver);
> >> +
> >> +MODULE_AUTHOR("Ramiro Oliveira <roliveir-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>");
> >> +MODULE_DESCRIPTION("A low-level driver for OmniVision ov5647 sensors");
> >> +MODULE_LICENSE("GPL v2");
> > 

-- 
Sakari Ailus
e-mail: sakari.ailus-X3B1VOXEql0@public.gmane.org	XMPP: sailus-PCDdDYkjdNMDXYZnReoRVg@public.gmane.org
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