Re: question about v4l2_subdev

[Sedji Gaouaou <sedji.gaouaou@atmel.com>]

Hi,

Sorry to bother you again, but here is the situation:
I have 2 drivers: an ov2640 driver and my atmel driver.
Basically the ov2640 driver is the same as the ov7670 driver.

So what I don't know is how to call the ov2640 functions(such as set 
format) in my atmel driver.

In the ov2640 I used the function: v4l2_i2c_subdev_init, and in the 
atmel driver I used v4l2_device_register.

But I don't know where I should use the v4l2_i2c_new_subdev function, 
and how to link my atmel video struct to the i2c sensor.

Is there any examples in linux?

Regards,
Sedji

Le 6/1/2010 10:14 AM, Sedji Gaouaou a écrit :
> Hi,
>
>
>>
>> 1. Something first should call v4l2_device_register() on a v4l2_device
>> object. (Typically there is only one v4l2_device object per "bridge"
>> chip between the PCI, PCIe, or USB bus and the subdevices, even if that
>> bridge chip has more than one I2C master implementation.)
>>
>> 2. Then, for subdevices connected to the bridge chip via I2C, something
>> needs to call v4l2_i2c_new_subdev() with the v4l2_device pointer as one
>> of the arguments, to get back a v4l2_subdevice instance pointer.
>>
>> 3. After that, v4l2_subdev_call() with the v4l2_subdev pointer as one of
>> the arguments can be used to invoke the subdevice methods.
>>
>> TV Video capture drivers do this work themselves. Drivers using a
>> camera framework may have the framework doing some of the work for them.
>>
>>
>> Regards,
>> Andy
>>
>>
>>
>
>
> Is there a sensor driver which is using this method?
>
> To write the ov2640 driver I have just copied the ov7670.c file, and I
> didn't find the v4l2_i2c_new_subdev in it...
>
> Regards,
> Sedji
>
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