[PATCHv2 0/2] Input: atmel_mxt_ts: Add reset support

[PATCHv2 0/2] Input: atmel_mxt_ts: Add reset support

[Sebastian Reichel]

Hi,

This adds support for the reset pin of Atmel MXT.

Changes since PATCHv1:
 - Add new patch preparing for resource managed gpio
 - Use resource managed gpio
 - Wait for interrupt after reset

-- Sebastian

Sebastian Reichel (2):
  Input: atmel_mxt_ts: Use more managed resources
  Input: atmel_mxt_ts: Add support for reset line

 .../devicetree/bindings/input/atmel,maxtouch.txt   |  2 ++
 drivers/input/touchscreen/atmel_mxt_ts.c           | 42 +++++++++++++++-------
 2 files changed, 31 insertions(+), 13 deletions(-)

-- 
2.13.2

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[PATCHv2 1/2] Input: atmel_mxt_ts: Use more managed resources

[Sebastian Reichel]

Switch mxt_data and interrupt to resource managed allocation methods,
which cleans up the driver slightly and prepares for adding
reset GPIO support.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index dd042a9b0aaa..9a7b8eba64a6 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -3117,11 +3117,9 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 
-	data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL);
-	if (!data) {
-		dev_err(&client->dev, "Failed to allocate memory\n");
+	data = devm_kzalloc(&client->dev, sizeof(struct mxt_data), GFP_KERNEL);
+	if (!data)
 		return -ENOMEM;
-	}
 
 	snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
 		 client->adapter->nr, client->addr);
@@ -3135,19 +3133,20 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	init_completion(&data->reset_completion);
 	init_completion(&data->crc_completion);
 
-	error = request_threaded_irq(client->irq, NULL, mxt_interrupt,
+	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+				     mxt_interrupt,
 				     pdata->irqflags | IRQF_ONESHOT,
 				     client->name, data);
 	if (error) {
 		dev_err(&client->dev, "Failed to register interrupt\n");
-		goto err_free_mem;
+		return error;
 	}
 
 	disable_irq(client->irq);
 
 	error = mxt_initialize(data);
 	if (error)
-		goto err_free_irq;
+		return error;
 
 	error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
 	if (error) {
@@ -3161,10 +3160,6 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 err_free_object:
 	mxt_free_input_device(data);
 	mxt_free_object_table(data);
-err_free_irq:
-	free_irq(client->irq, data);
-err_free_mem:
-	kfree(data);
 	return error;
 }
 
@@ -3172,11 +3167,10 @@ static int mxt_remove(struct i2c_client *client)
 {
 	struct mxt_data *data = i2c_get_clientdata(client);
 
+	disable_irq(data->irq);
 	sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
-	free_irq(data->irq, data);
 	mxt_free_input_device(data);
 	mxt_free_object_table(data);
-	kfree(data);
 
 	return 0;
 }
-- 
2.13.2

[PATCHv2 2/2] Input: atmel_mxt_ts: Add support for reset line

[Sebastian Reichel]

Provide support for controlling reset pin. If this is not driven
correctly the device will be held in reset and will not respond.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
---
 .../devicetree/bindings/input/atmel,maxtouch.txt   |  2 ++
 drivers/input/touchscreen/atmel_mxt_ts.c           | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
index 1852906517ab..23e3abc3fdef 100644
--- a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
+++ b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
@@ -22,6 +22,8 @@ Optional properties for main touchpad device:
     experiment to determine which bit corresponds to which input. Use
     KEY_RESERVED for unused padding values.
 
+- reset-gpios: GPIO specifier for the touchscreen's reset pin (active low)
+
 Example:
 
 	touch@4b {
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 9a7b8eba64a6..599f92363188 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -28,6 +28,7 @@
 #include <linux/interrupt.h>
 #include <linux/of.h>
 #include <linux/slab.h>
+#include <linux/gpio/consumer.h>
 #include <asm/unaligned.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ioctl.h>
@@ -300,6 +301,7 @@ struct mxt_data {
 	u8 multitouch;
 	struct t7_config t7_cfg;
 	struct mxt_dbg dbg;
+	struct gpio_desc *reset_gpio;
 
 	/* Cached parameters from object table */
 	u16 T5_address;
@@ -3133,6 +3135,14 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	init_completion(&data->reset_completion);
 	init_completion(&data->crc_completion);
 
+	data->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+					      GPIOD_OUT_LOW);
+	if (IS_ERR(data->reset_gpio)) {
+		error = PTR_ERR(data->reset_gpio);
+		dev_err(&client->dev, "Failed to get reset gpio: %d\n", error);
+		return error;
+	}
+
 	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
 				     mxt_interrupt,
 				     pdata->irqflags | IRQF_ONESHOT,
@@ -3142,6 +3152,18 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		return error;
 	}
 
+	if (data->reset_gpio) {
+		data->in_bootloader = true;
+		msleep(MXT_RESET_TIME);
+		reinit_completion(&data->bl_completion);
+		gpiod_set_value(data->reset_gpio, 1);
+		error = mxt_wait_for_completion(data, &data->bl_completion,
+						MXT_RESET_TIMEOUT);
+		if (error)
+			return error;
+		data->in_bootloader = false;
+	}
+
 	disable_irq(client->irq);
 
 	error = mxt_initialize(data);
-- 
2.13.2

Re: [PATCHv2 0/2] Input: atmel_mxt_ts: Add reset support

[Sebastian Reichel]

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Hi Dmitry,

Gentle ping on this one. This helps to remove a hack from the
Droid 4 DT and will also be used by PPD, which is currently
being upstreamed:

https://lkml.org/lkml/2017/7/19/898

-- Sebastian

On Mon, Jul 03, 2017 at 02:38:41PM +0200, Sebastian Reichel wrote:
> Hi,
> 
> This adds support for the reset pin of Atmel MXT.
> 
> Changes since PATCHv1:
>  - Add new patch preparing for resource managed gpio
>  - Use resource managed gpio
>  - Wait for interrupt after reset
> 
> -- Sebastian
> 
> Sebastian Reichel (2):
>   Input: atmel_mxt_ts: Use more managed resources
>   Input: atmel_mxt_ts: Add support for reset line
> 
>  .../devicetree/bindings/input/atmel,maxtouch.txt   |  2 ++
>  drivers/input/touchscreen/atmel_mxt_ts.c           | 42 +++++++++++++++-------
>  2 files changed, 31 insertions(+), 13 deletions(-)
> 
> -- 
> 2.13.2
> 

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Re: [PATCHv2 0/2] Input: atmel_mxt_ts: Add reset support

[Sebastian Reichel]

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Hi,

ping?

-- Sebastian

On Tue, Jul 25, 2017 at 03:56:56PM +0200, Sebastian Reichel wrote:
> Hi Dmitry,
> 
> Gentle ping on this one. This helps to remove a hack from the
> Droid 4 DT and will also be used by PPD, which is currently
> being upstreamed:
> 
> https://lkml.org/lkml/2017/7/19/898
> 
> -- Sebastian
> 
> On Mon, Jul 03, 2017 at 02:38:41PM +0200, Sebastian Reichel wrote:
> > Hi,
> > 
> > This adds support for the reset pin of Atmel MXT.
> > 
> > Changes since PATCHv1:
> >  - Add new patch preparing for resource managed gpio
> >  - Use resource managed gpio
> >  - Wait for interrupt after reset
> > 
> > -- Sebastian
> > 
> > Sebastian Reichel (2):
> >   Input: atmel_mxt_ts: Use more managed resources
> >   Input: atmel_mxt_ts: Add support for reset line
> > 
> >  .../devicetree/bindings/input/atmel,maxtouch.txt   |  2 ++
> >  drivers/input/touchscreen/atmel_mxt_ts.c           | 42 +++++++++++++++-------
> >  2 files changed, 31 insertions(+), 13 deletions(-)
> > 
> > -- 
> > 2.13.2
> > 



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