[PATCH 1/5] Input: tca8418_keypad - use a temporary variable for parent device

[PATCH 1/5] Input: tca8418_keypad - use a temporary variable for parent device

[Dmitry Torokhov]

Use a temporary variable for our parent device (coming from I2C client
structure); we'll be also using it during conversion to managed resources.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/tca8418_keypad.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
index 65cf5fa..4618ce0 100644
--- a/drivers/input/keyboard/tca8418_keypad.c
+++ b/drivers/input/keyboard/tca8418_keypad.c
@@ -281,6 +281,7 @@ static int __devinit tca8418_configure(struct tca8418_keypad *keypad_data,
 static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 					  const struct i2c_device_id *id)
 {
+	struct device *dev = &client->dev;
 	const struct tca8418_keypad_platform_data *pdata =
 						client->dev.platform_data;
 	struct tca8418_keypad *keypad_data;
@@ -294,7 +295,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 	/* Copy the platform data */
 	if (pdata) {
 		if (!pdata->keymap_data) {
-			dev_err(&client->dev, "no keymap data defined\n");
+			dev_err(dev, "no keymap data defined\n");
 			return -EINVAL;
 		}
 		keymap_data = pdata->keymap_data;
@@ -303,25 +304,25 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 		rep  = pdata->rep;
 		irq_is_gpio = pdata->irq_is_gpio;
 	} else {
-		struct device_node *np = client->dev.of_node;
+		struct device_node *np = dev->of_node;
 		of_property_read_u32(np, "keypad,num-rows", &rows);
 		of_property_read_u32(np, "keypad,num-columns", &cols);
 		rep = of_property_read_bool(np, "keypad,autorepeat");
 	}
 
 	if (!rows || rows > TCA8418_MAX_ROWS) {
-		dev_err(&client->dev, "invalid rows\n");
+		dev_err(dev, "invalid rows\n");
 		return -EINVAL;
 	}
 
 	if (!cols || cols > TCA8418_MAX_COLS) {
-		dev_err(&client->dev, "invalid columns\n");
+		dev_err(dev, "invalid columns\n");
 		return -EINVAL;
 	}
 
 	/* Check i2c driver capabilities */
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
-		dev_err(&client->dev, "%s adapter not supported\n",
+		dev_err(dev, "%s adapter not supported\n",
 			dev_driver_string(&client->adapter->dev));
 		return -ENODEV;
 	}
@@ -362,7 +363,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 	error = matrix_keypad_build_keymap(keymap_data, NULL, rows, cols,
 					   keypad_data->keymap, input);
 	if (error) {
-		dev_dbg(&client->dev, "Failed to build keymap\n");
+		dev_dbg(dev, "Failed to build keymap\n");
 		goto fail2;
 	}
 
@@ -381,16 +382,15 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 				     IRQF_ONESHOT,
 				     client->name, keypad_data);
 	if (error) {
-		dev_dbg(&client->dev,
-			"Unable to claim irq %d; error %d\n",
+		dev_dbg(dev, "Unable to claim irq %d; error %d\n",
 			client->irq, error);
 		goto fail2;
 	}
 
 	error = input_register_device(input);
 	if (error) {
-		dev_dbg(&client->dev,
-			"Unable to register input device, error: %d\n", error);
+		dev_dbg(dev, "Unable to register input device, error: %d\n",
+			error);
 		goto fail3;
 	}
 
-- 
1.7.11.7

[PATCH 2/5] Input: tca8418_keypad - use dev_get_platdata() to retrieve platform data

[Dmitry Torokhov]

We need to use proper accessor functions instead of directly poking into
various structures.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/tca8418_keypad.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
index 4618ce0..7f2869f 100644
--- a/drivers/input/keyboard/tca8418_keypad.c
+++ b/drivers/input/keyboard/tca8418_keypad.c
@@ -283,7 +283,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 {
 	struct device *dev = &client->dev;
 	const struct tca8418_keypad_platform_data *pdata =
-						client->dev.platform_data;
+						dev_get_platdata(dev);
 	struct tca8418_keypad *keypad_data;
 	struct input_dev *input;
 	const struct matrix_keymap_data *keymap_data = NULL;
-- 
1.7.11.7

Re: [PATCH 2/5] Input: tca8418_keypad - use dev_get_platdata() to retrieve platform data

[Alban Bedel]

On Wed, 14 Nov 2012 08:48:05 -0800
Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

> We need to use proper accessor functions instead of directly poking into
> various structures.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Reviewed-by: Alban Bedel <alban.bedel@avionic-design.de>

> ---
>  drivers/input/keyboard/tca8418_keypad.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
> index 4618ce0..7f2869f 100644
> --- a/drivers/input/keyboard/tca8418_keypad.c
> +++ b/drivers/input/keyboard/tca8418_keypad.c
> @@ -283,7 +283,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  {
>  	struct device *dev = &client->dev;
>  	const struct tca8418_keypad_platform_data *pdata =
> -						client->dev.platform_data;
> +						dev_get_platdata(dev);
>  	struct tca8418_keypad *keypad_data;
>  	struct input_dev *input;
>  	const struct matrix_keymap_data *keymap_data = NULL;

[PATCH 3/5] Input: tca8418_keypad - move device ID tables closer to where they are used

[Dmitry Torokhov]

This matches structure of most other input drivers.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/tca8418_keypad.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
index 7f2869f..35340c3 100644
--- a/drivers/input/keyboard/tca8418_keypad.c
+++ b/drivers/input/keyboard/tca8418_keypad.c
@@ -110,21 +110,6 @@
 #define KEY_EVENT_CODE		0x7f
 #define KEY_EVENT_VALUE		0x80
 
-
-static const struct i2c_device_id tca8418_id[] = {
-	{ TCA8418_NAME, 8418, },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, tca8418_id);
-
-#ifdef CONFIG_OF
-static const struct of_device_id tca8418_dt_ids[] __devinitconst = {
-	{ .compatible = "ti,tca8418", },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, tca8418_dt_ids);
-#endif
-
 struct tca8418_keypad {
 	unsigned int irq;
 	unsigned int row_shift;
@@ -419,6 +404,20 @@ static int __devexit tca8418_keypad_remove(struct i2c_client *client)
 	return 0;
 }
 
+static const struct i2c_device_id tca8418_id[] = {
+	{ TCA8418_NAME, 8418, },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tca8418_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id tca8418_dt_ids[] __devinitconst = {
+	{ .compatible = "ti,tca8418", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tca8418_dt_ids);
+#endif
+
 static struct i2c_driver tca8418_keypad_driver = {
 	.driver = {
 		.name	= TCA8418_NAME,
-- 
1.7.11.7

Re: [PATCH 3/5] Input: tca8418_keypad - move device ID tables closer to where they are used

[Alban Bedel]

On Wed, 14 Nov 2012 08:48:06 -0800
Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

> This matches structure of most other input drivers.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Reviewed-by: Alban Bedel <alban.bedel@avionic-design.de>

> ---
>  drivers/input/keyboard/tca8418_keypad.c | 29 ++++++++++++++---------------
>  1 file changed, 14 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
> index 7f2869f..35340c3 100644
> --- a/drivers/input/keyboard/tca8418_keypad.c
> +++ b/drivers/input/keyboard/tca8418_keypad.c
> @@ -110,21 +110,6 @@
>  #define KEY_EVENT_CODE		0x7f
>  #define KEY_EVENT_VALUE		0x80
>  
> -
> -static const struct i2c_device_id tca8418_id[] = {
> -	{ TCA8418_NAME, 8418, },
> -	{ }
> -};
> -MODULE_DEVICE_TABLE(i2c, tca8418_id);
> -
> -#ifdef CONFIG_OF
> -static const struct of_device_id tca8418_dt_ids[] __devinitconst = {
> -	{ .compatible = "ti,tca8418", },
> -	{ }
> -};
> -MODULE_DEVICE_TABLE(of, tca8418_dt_ids);
> -#endif
> -
>  struct tca8418_keypad {
>  	unsigned int irq;
>  	unsigned int row_shift;
> @@ -419,6 +404,20 @@ static int __devexit tca8418_keypad_remove(struct i2c_client *client)
>  	return 0;
>  }
>  
> +static const struct i2c_device_id tca8418_id[] = {
> +	{ TCA8418_NAME, 8418, },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, tca8418_id);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id tca8418_dt_ids[] __devinitconst = {
> +	{ .compatible = "ti,tca8418", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, tca8418_dt_ids);
> +#endif
> +
>  static struct i2c_driver tca8418_keypad_driver = {
>  	.driver = {
>  		.name	= TCA8418_NAME,

[PATCH 4/5] Input: tca8418_keypad - increase severity of failures in probe()

[Dmitry Torokhov]

Failures to build a keymap, request an IRQ, or register input device are
fatal for the driver, therefore the messages should have "error" severity
instead of "debug".

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/tca8418_keypad.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
index 35340c3..10047eb 100644
--- a/drivers/input/keyboard/tca8418_keypad.c
+++ b/drivers/input/keyboard/tca8418_keypad.c
@@ -348,7 +348,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 	error = matrix_keypad_build_keymap(keymap_data, NULL, rows, cols,
 					   keypad_data->keymap, input);
 	if (error) {
-		dev_dbg(dev, "Failed to build keymap\n");
+		dev_err(dev, "Failed to build keymap\n");
 		goto fail2;
 	}
 
@@ -367,14 +367,14 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 				     IRQF_ONESHOT,
 				     client->name, keypad_data);
 	if (error) {
-		dev_dbg(dev, "Unable to claim irq %d; error %d\n",
+		dev_err(dev, "Unable to claim irq %d; error %d\n",
 			client->irq, error);
 		goto fail2;
 	}
 
 	error = input_register_device(input);
 	if (error) {
-		dev_dbg(dev, "Unable to register input device, error: %d\n",
+		dev_err(dev, "Unable to register input device, error: %d\n",
 			error);
 		goto fail3;
 	}
-- 
1.7.11.7

Re: [PATCH 4/5] Input: tca8418_keypad - increase severity of failures in probe()

[Alban Bedel]

On Wed, 14 Nov 2012 08:48:07 -0800
Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

> Failures to build a keymap, request an IRQ, or register input device are
> fatal for the driver, therefore the messages should have "error" severity
> instead of "debug".
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Reviewed-by: Alban Bedel <alban.bedel@avionic-design.de>

> ---
>  drivers/input/keyboard/tca8418_keypad.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
> index 35340c3..10047eb 100644
> --- a/drivers/input/keyboard/tca8418_keypad.c
> +++ b/drivers/input/keyboard/tca8418_keypad.c
> @@ -348,7 +348,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  	error = matrix_keypad_build_keymap(keymap_data, NULL, rows, cols,
>  					   keypad_data->keymap, input);
>  	if (error) {
> -		dev_dbg(dev, "Failed to build keymap\n");
> +		dev_err(dev, "Failed to build keymap\n");
>  		goto fail2;
>  	}
>  
> @@ -367,14 +367,14 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  				     IRQF_ONESHOT,
>  				     client->name, keypad_data);
>  	if (error) {
> -		dev_dbg(dev, "Unable to claim irq %d; error %d\n",
> +		dev_err(dev, "Unable to claim irq %d; error %d\n",
>  			client->irq, error);
>  		goto fail2;
>  	}
>  
>  	error = input_register_device(input);
>  	if (error) {
> -		dev_dbg(dev, "Unable to register input device, error: %d\n",
> +		dev_err(dev, "Unable to register input device, error: %d\n",
>  			error);
>  		goto fail3;
>  	}

[PATCH 5/5] Input: tca8418-keypad - switch to use managed resources

[Dmitry Torokhov]

Let's switch to using devm_*() interfaces to manage our resources, thus will
simplify error unwinding a bit.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/tca8418_keypad.c | 78 +++++++++++----------------------
 1 file changed, 25 insertions(+), 53 deletions(-)

diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
index 10047eb..f9a13c9 100644
--- a/drivers/input/keyboard/tca8418_keypad.c
+++ b/drivers/input/keyboard/tca8418_keypad.c
@@ -111,14 +111,10 @@
 #define KEY_EVENT_VALUE		0x80
 
 struct tca8418_keypad {
-	unsigned int irq;
-	unsigned int row_shift;
-
 	struct i2c_client *client;
 	struct input_dev *input;
 
-	/* Flexible array member, must be at end of struct */
-	unsigned short keymap[];
+	unsigned int row_shift;
 };
 
 /*
@@ -163,6 +159,8 @@ static int tca8418_read_byte(struct tca8418_keypad *keypad_data,
 
 static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
 {
+	struct input_dev *input = keypad_data->input;
+	unsigned short *keymap = input->keycode;
 	int error, col, row;
 	u8 reg, state, code;
 
@@ -181,9 +179,8 @@ static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
 		col = (col) ? col - 1 : TCA8418_MAX_COLS - 1;
 
 		code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);
-		input_event(keypad_data->input, EV_MSC, MSC_SCAN, code);
-		input_report_key(keypad_data->input,
-				keypad_data->keymap[code], state);
+		input_event(input, EV_MSC, MSC_SCAN, code);
+		input_report_key(input, keymap[code], state);
 
 		/* Read for next loop */
 		error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg);
@@ -193,7 +190,7 @@ static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
 		dev_err(&keypad_data->client->dev,
 			"unable to read REG_KEY_EVENT_A\n");
 
-	input_sync(keypad_data->input);
+	input_sync(input);
 }
 
 /*
@@ -275,6 +272,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 	u32 rows = 0, cols = 0;
 	bool rep = false;
 	bool irq_is_gpio = false;
+	int irq;
 	int error, row_shift, max_keys;
 
 	/* Copy the platform data */
@@ -315,9 +313,8 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 	row_shift = get_count_order(cols);
 	max_keys = rows << row_shift;
 
-	/* Allocate memory for keypad_data, keymap and input device */
-	keypad_data = kzalloc(sizeof(*keypad_data) +
-			max_keys * sizeof(keypad_data->keymap[0]), GFP_KERNEL);
+	/* Allocate memory for keypad_data and input device */
+	keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL);
 	if (!keypad_data)
 		return -ENOMEM;
 
@@ -327,29 +324,26 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 	/* Initialize the chip or fail if chip isn't present */
 	error = tca8418_configure(keypad_data, rows, cols);
 	if (error < 0)
-		goto fail1;
+		return error;
 
 	/* Configure input device */
-	input = input_allocate_device();
-	if (!input) {
-		error = -ENOMEM;
-		goto fail1;
-	}
+	input = devm_input_allocate_device(dev);
+	if (!input)
+		return -ENOMEM;
+
 	keypad_data->input = input;
 
 	input->name = client->name;
-	input->dev.parent = &client->dev;
-
 	input->id.bustype = BUS_I2C;
 	input->id.vendor  = 0x0001;
 	input->id.product = 0x001;
 	input->id.version = 0x0001;
 
 	error = matrix_keypad_build_keymap(keymap_data, NULL, rows, cols,
-					   keypad_data->keymap, input);
+					   NULL, input);
 	if (error) {
 		dev_err(dev, "Failed to build keymap\n");
-		goto fail2;
+		return error;
 	}
 
 	if (rep)
@@ -358,49 +352,28 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
 
 	input_set_drvdata(input, keypad_data);
 
+	irq = client->irq;
 	if (irq_is_gpio)
-		client->irq = gpio_to_irq(client->irq);
+		irq = gpio_to_irq(irq);
 
-	error = request_threaded_irq(client->irq, NULL, tca8418_irq_handler,
-				     IRQF_TRIGGER_FALLING |
-				     IRQF_SHARED |
-				     IRQF_ONESHOT,
-				     client->name, keypad_data);
+	error = devm_request_threaded_irq(dev, irq, NULL, tca8418_irq_handler,
+					  IRQF_TRIGGER_FALLING |
+						IRQF_SHARED |
+						IRQF_ONESHOT,
+					  client->name, keypad_data);
 	if (error) {
 		dev_err(dev, "Unable to claim irq %d; error %d\n",
 			client->irq, error);
-		goto fail2;
+		return error;
 	}
 
 	error = input_register_device(input);
 	if (error) {
 		dev_err(dev, "Unable to register input device, error: %d\n",
 			error);
-		goto fail3;
+		return error;
 	}
 
-	i2c_set_clientdata(client, keypad_data);
-	return 0;
-
-fail3:
-	free_irq(client->irq, keypad_data);
-fail2:
-	input_free_device(input);
-fail1:
-	kfree(keypad_data);
-	return error;
-}
-
-static int __devexit tca8418_keypad_remove(struct i2c_client *client)
-{
-	struct tca8418_keypad *keypad_data = i2c_get_clientdata(client);
-
-	free_irq(keypad_data->client->irq, keypad_data);
-
-	input_unregister_device(keypad_data->input);
-
-	kfree(keypad_data);
-
 	return 0;
 }
 
@@ -425,7 +398,6 @@ static struct i2c_driver tca8418_keypad_driver = {
 		.of_match_table = of_match_ptr(tca8418_dt_ids),
 	},
 	.probe		= tca8418_keypad_probe,
-	.remove		= __devexit_p(tca8418_keypad_remove),
 	.id_table	= tca8418_id,
 };
 
-- 
1.7.11.7

Re: [PATCH 5/5] Input: tca8418-keypad - switch to use managed resources

[Alban Bedel]

On Wed, 14 Nov 2012 08:48:08 -0800
Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

> Let's switch to using devm_*() interfaces to manage our resources, thus will
> simplify error unwinding a bit.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Reviewed-by: Alban Bedel <alban.bedel@avionic-design.de>

> ---
>  drivers/input/keyboard/tca8418_keypad.c | 78 +++++++++++----------------------
>  1 file changed, 25 insertions(+), 53 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
> index 10047eb..f9a13c9 100644
> --- a/drivers/input/keyboard/tca8418_keypad.c
> +++ b/drivers/input/keyboard/tca8418_keypad.c
> @@ -111,14 +111,10 @@
>  #define KEY_EVENT_VALUE		0x80
>  
>  struct tca8418_keypad {
> -	unsigned int irq;
> -	unsigned int row_shift;
> -
>  	struct i2c_client *client;
>  	struct input_dev *input;
>  
> -	/* Flexible array member, must be at end of struct */
> -	unsigned short keymap[];
> +	unsigned int row_shift;
>  };
>  
>  /*
> @@ -163,6 +159,8 @@ static int tca8418_read_byte(struct tca8418_keypad *keypad_data,
>  
>  static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
>  {
> +	struct input_dev *input = keypad_data->input;
> +	unsigned short *keymap = input->keycode;
>  	int error, col, row;
>  	u8 reg, state, code;
>  
> @@ -181,9 +179,8 @@ static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
>  		col = (col) ? col - 1 : TCA8418_MAX_COLS - 1;
>  
>  		code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);
> -		input_event(keypad_data->input, EV_MSC, MSC_SCAN, code);
> -		input_report_key(keypad_data->input,
> -				keypad_data->keymap[code], state);
> +		input_event(input, EV_MSC, MSC_SCAN, code);
> +		input_report_key(input, keymap[code], state);
>  
>  		/* Read for next loop */
>  		error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg);
> @@ -193,7 +190,7 @@ static void tca8418_read_keypad(struct tca8418_keypad *keypad_data)
>  		dev_err(&keypad_data->client->dev,
>  			"unable to read REG_KEY_EVENT_A\n");
>  
> -	input_sync(keypad_data->input);
> +	input_sync(input);
>  }
>  
>  /*
> @@ -275,6 +272,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  	u32 rows = 0, cols = 0;
>  	bool rep = false;
>  	bool irq_is_gpio = false;
> +	int irq;
>  	int error, row_shift, max_keys;
>  
>  	/* Copy the platform data */
> @@ -315,9 +313,8 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  	row_shift = get_count_order(cols);
>  	max_keys = rows << row_shift;
>  
> -	/* Allocate memory for keypad_data, keymap and input device */
> -	keypad_data = kzalloc(sizeof(*keypad_data) +
> -			max_keys * sizeof(keypad_data->keymap[0]), GFP_KERNEL);
> +	/* Allocate memory for keypad_data and input device */
> +	keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL);
>  	if (!keypad_data)
>  		return -ENOMEM;
>  
> @@ -327,29 +324,26 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  	/* Initialize the chip or fail if chip isn't present */
>  	error = tca8418_configure(keypad_data, rows, cols);
>  	if (error < 0)
> -		goto fail1;
> +		return error;
>  
>  	/* Configure input device */
> -	input = input_allocate_device();
> -	if (!input) {
> -		error = -ENOMEM;
> -		goto fail1;
> -	}
> +	input = devm_input_allocate_device(dev);
> +	if (!input)
> +		return -ENOMEM;
> +
>  	keypad_data->input = input;
>  
>  	input->name = client->name;
> -	input->dev.parent = &client->dev;
> -
>  	input->id.bustype = BUS_I2C;
>  	input->id.vendor  = 0x0001;
>  	input->id.product = 0x001;
>  	input->id.version = 0x0001;
>  
>  	error = matrix_keypad_build_keymap(keymap_data, NULL, rows, cols,
> -					   keypad_data->keymap, input);
> +					   NULL, input);
>  	if (error) {
>  		dev_err(dev, "Failed to build keymap\n");
> -		goto fail2;
> +		return error;
>  	}
>  
>  	if (rep)
> @@ -358,49 +352,28 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  
>  	input_set_drvdata(input, keypad_data);
>  
> +	irq = client->irq;
>  	if (irq_is_gpio)
> -		client->irq = gpio_to_irq(client->irq);
> +		irq = gpio_to_irq(irq);
>  
> -	error = request_threaded_irq(client->irq, NULL, tca8418_irq_handler,
> -				     IRQF_TRIGGER_FALLING |
> -				     IRQF_SHARED |
> -				     IRQF_ONESHOT,
> -				     client->name, keypad_data);
> +	error = devm_request_threaded_irq(dev, irq, NULL, tca8418_irq_handler,
> +					  IRQF_TRIGGER_FALLING |
> +						IRQF_SHARED |
> +						IRQF_ONESHOT,
> +					  client->name, keypad_data);
>  	if (error) {
>  		dev_err(dev, "Unable to claim irq %d; error %d\n",
>  			client->irq, error);
> -		goto fail2;
> +		return error;
>  	}
>  
>  	error = input_register_device(input);
>  	if (error) {
>  		dev_err(dev, "Unable to register input device, error: %d\n",
>  			error);
> -		goto fail3;
> +		return error;
>  	}
>  
> -	i2c_set_clientdata(client, keypad_data);
> -	return 0;
> -
> -fail3:
> -	free_irq(client->irq, keypad_data);
> -fail2:
> -	input_free_device(input);
> -fail1:
> -	kfree(keypad_data);
> -	return error;
> -}
> -
> -static int __devexit tca8418_keypad_remove(struct i2c_client *client)
> -{
> -	struct tca8418_keypad *keypad_data = i2c_get_clientdata(client);
> -
> -	free_irq(keypad_data->client->irq, keypad_data);
> -
> -	input_unregister_device(keypad_data->input);
> -
> -	kfree(keypad_data);
> -
>  	return 0;
>  }
>  
> @@ -425,7 +398,6 @@ static struct i2c_driver tca8418_keypad_driver = {
>  		.of_match_table = of_match_ptr(tca8418_dt_ids),
>  	},
>  	.probe		= tca8418_keypad_probe,
> -	.remove		= __devexit_p(tca8418_keypad_remove),
>  	.id_table	= tca8418_id,
>  };
>  

Re: [PATCH 1/5] Input: tca8418_keypad - use a temporary variable for parent device

[Dmitry Torokhov]

On Wed, Nov 14, 2012 at 08:48:04AM -0800, Dmitry Torokhov wrote:
> Use a temporary variable for our parent device (coming from I2C client
> structure); we'll be also using it during conversion to managed resources.
> 

Alban, if you could test the patches that would be great as 3.8 merge
window is approaching.

Thanks!

-- 
Dmitry

Re: [PATCH 1/5] Input: tca8418_keypad - use a temporary variable for parent device

[Alban Bedel]

On Wed, 14 Nov 2012 08:48:04 -0800
Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

> Use a temporary variable for our parent device (coming from I2C client
> structure); we'll be also using it during conversion to managed resources.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Reviewed-by: Alban Bedel <alban.bedel@avionic-design.de>

> ---
>  drivers/input/keyboard/tca8418_keypad.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboard/tca8418_keypad.c
> index 65cf5fa..4618ce0 100644
> --- a/drivers/input/keyboard/tca8418_keypad.c
> +++ b/drivers/input/keyboard/tca8418_keypad.c
> @@ -281,6 +281,7 @@ static int __devinit tca8418_configure(struct tca8418_keypad *keypad_data,
>  static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  					  const struct i2c_device_id *id)
>  {
> +	struct device *dev = &client->dev;
>  	const struct tca8418_keypad_platform_data *pdata =
>  						client->dev.platform_data;
>  	struct tca8418_keypad *keypad_data;
> @@ -294,7 +295,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  	/* Copy the platform data */
>  	if (pdata) {
>  		if (!pdata->keymap_data) {
> -			dev_err(&client->dev, "no keymap data defined\n");
> +			dev_err(dev, "no keymap data defined\n");
>  			return -EINVAL;
>  		}
>  		keymap_data = pdata->keymap_data;
> @@ -303,25 +304,25 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  		rep  = pdata->rep;
>  		irq_is_gpio = pdata->irq_is_gpio;
>  	} else {
> -		struct device_node *np = client->dev.of_node;
> +		struct device_node *np = dev->of_node;
>  		of_property_read_u32(np, "keypad,num-rows", &rows);
>  		of_property_read_u32(np, "keypad,num-columns", &cols);
>  		rep = of_property_read_bool(np, "keypad,autorepeat");
>  	}
>  
>  	if (!rows || rows > TCA8418_MAX_ROWS) {
> -		dev_err(&client->dev, "invalid rows\n");
> +		dev_err(dev, "invalid rows\n");
>  		return -EINVAL;
>  	}
>  
>  	if (!cols || cols > TCA8418_MAX_COLS) {
> -		dev_err(&client->dev, "invalid columns\n");
> +		dev_err(dev, "invalid columns\n");
>  		return -EINVAL;
>  	}
>  
>  	/* Check i2c driver capabilities */
>  	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
> -		dev_err(&client->dev, "%s adapter not supported\n",
> +		dev_err(dev, "%s adapter not supported\n",
>  			dev_driver_string(&client->adapter->dev));
>  		return -ENODEV;
>  	}
> @@ -362,7 +363,7 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  	error = matrix_keypad_build_keymap(keymap_data, NULL, rows, cols,
>  					   keypad_data->keymap, input);
>  	if (error) {
> -		dev_dbg(&client->dev, "Failed to build keymap\n");
> +		dev_dbg(dev, "Failed to build keymap\n");
>  		goto fail2;
>  	}
>  
> @@ -381,16 +382,15 @@ static int __devinit tca8418_keypad_probe(struct i2c_client *client,
>  				     IRQF_ONESHOT,
>  				     client->name, keypad_data);
>  	if (error) {
> -		dev_dbg(&client->dev,
> -			"Unable to claim irq %d; error %d\n",
> +		dev_dbg(dev, "Unable to claim irq %d; error %d\n",
>  			client->irq, error);
>  		goto fail2;
>  	}
>  
>  	error = input_register_device(input);
>  	if (error) {
> -		dev_dbg(&client->dev,
> -			"Unable to register input device, error: %d\n", error);
> +		dev_dbg(dev, "Unable to register input device, error: %d\n",
> +			error);
>  		goto fail3;
>  	}
>