[PATCHv4 0/8] Resource-managed extcon device register function

[PATCHv4 0/8] Resource-managed extcon device register function

[Sangjung Woo]

These patches add resource-managed extcon device register functions for
developers' convenience and apply them to related device driver files.
This work can make the code more tidy since extcon device is automatically
unregistered on driver detach so tiresome managing codes could be removed.


Changelog

v4:
* fix the memory leak bug becuase of single pointer
* clean up the unnecessary code and make proper indentation

v3:
* send the right version instead of previous v1
* add the credit for reviewers according to the review rules

v2:
* modify and clean up all unnecessary code reported by Chanwoo
* fix the bug reported by Seung-Woo
* add the credit for reviewers

v1:
* initial version

Sangjung Woo (8):
  extcon: Add resource-managed extcon register function
  extcon: adc-jack: Use devm_extcon_dev_register()
  extcon: gpio: Use devm_extcon_dev_register()
  extcon: max14577: Use devm_extcon_dev_register()
  extcon: max77693: Use devm_extcon_dev_register()
  extcon: max8997: Use devm_extcon_dev_register()
  extcon: palmas: Use devm_extcon_dev_register()
  extcon: arizona: Use devm_extcon_dev_register()

 drivers/extcon/extcon-adc-jack.c |   30 ++++++------------
 drivers/extcon/extcon-arizona.c  |   12 +++----
 drivers/extcon/extcon-class.c    |   64 ++++++++++++++++++++++++++++++++++++++
 drivers/extcon/extcon-gpio.c     |   16 +++-------
 drivers/extcon/extcon-max14577.c |    9 ++----
 drivers/extcon/extcon-max77693.c |    7 ++---
 drivers/extcon/extcon-max8997.c  |    4 +--
 drivers/extcon/extcon-palmas.c   |   15 +++------
 include/linux/extcon.h           |   17 ++++++++++
 9 files changed, 108 insertions(+), 66 deletions(-)

-- 
1.7.9.5

[PATCHv4 1/8] extcon: Add resource-managed extcon register function

[Sangjung Woo]

Add resource-managed extcon device register function for convenience.
For example, if a extcon device is attached with new
devm_extcon_dev_register(), that extcon device is automatically
unregistered on driver detach.

Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
---
 drivers/extcon/extcon-class.c |   64 +++++++++++++++++++++++++++++++++++++++++
 include/linux/extcon.h        |   17 +++++++++++
 2 files changed, 81 insertions(+)

diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index 7ab21aa..645b02b 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -819,6 +819,70 @@ void extcon_dev_unregister(struct extcon_dev *edev)
 }
 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
 
+static void devm_extcon_dev_release(struct device *dev, void *res)
+{
+	extcon_dev_unregister((struct extcon_dev *)res);
+}
+
+static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
+{
+	return res == data;
+}
+
+/**
+ * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
+ * @dev:	device to allocate extcon device
+ * @edev:	the new extcon device to register
+ *
+ * Managed extcon_dev_register() function. If extcon device is attached with
+ * this function, that extcon device is automatically unregistered on driver
+ * detach. Internally this function calls extcon_dev_register() function.
+ * To get more information, refer that function.
+ *
+ * If extcon device is registered with this function and the device needs to be
+ * unregistered separately, devm_extcon_dev_unregister() should be used.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
+{
+	struct extcon_dev **ptr;
+	int ret;
+
+	ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr),
+			GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	ret = extcon_dev_register(edev);
+	if (ret) {
+		devres_free(ptr);
+		return ret;
+	}
+
+	*ptr = edev;
+	devres_add(dev, ptr);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
+
+/**
+ * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
+ * @dev:	device the extcon belongs to
+ * @edev:	the extcon device to unregister
+ *
+ * Unregister extcon device that is registered with devm_extcon_dev_register()
+ * function.
+ */
+void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
+{
+	WARN_ON(devres_release(dev, devm_extcon_dev_release,
+			devm_extcon_dev_match, edev));
+}
+EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
+
 #ifdef CONFIG_OF
 /*
  * extcon_get_edev_by_phandle - Get the extcon device from devicetree
diff --git a/include/linux/extcon.h b/include/linux/extcon.h
index f488145..6a17f69 100644
--- a/include/linux/extcon.h
+++ b/include/linux/extcon.h
@@ -188,6 +188,14 @@ extern void extcon_dev_unregister(struct extcon_dev *edev);
 extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
 
 /*
+ * Resource-managed extcon device register function.
+ */
+extern int devm_extcon_dev_register(struct device *dev,
+				    struct extcon_dev *edev);
+extern void devm_extcon_dev_unregister(struct device *dev,
+				       struct extcon_dev *edev);
+
+/*
  * get/set/update_state access the 32b encoded state value, which represents
  * states of all possible cables of the multistate port. For example, if one
  * calls extcon_set_state(edev, 0x7), it may mean that all the three cables
@@ -254,6 +262,15 @@ static inline int extcon_dev_register(struct extcon_dev *edev)
 
 static inline void extcon_dev_unregister(struct extcon_dev *edev) { }
 
+static inline devm_extcon_dev_register(struct device *dev,
+				       struct extcon_dev *edev)
+{
+	return 0;
+}
+
+static inline devm_extcon_dev_unregister(struct device *dev,
+					 struct extcon_dev *edev) { }
+
 static inline u32 extcon_get_state(struct extcon_dev *edev)
 {
 	return 0;
-- 
1.7.9.5

Re: [PATCHv4 1/8] extcon: Add resource-managed extcon register function

[Chanwoo Choi]

Hi,

This patch has some bug and need code clean.
I'll fix it and resend only this patch on v5.

Thanks,
Chanwoo Choi

On 04/21/2014 07:10 PM, Sangjung Woo wrote:
> Add resource-managed extcon device register function for convenience.
> For example, if a extcon device is attached with new
> devm_extcon_dev_register(), that extcon device is automatically
> unregistered on driver detach.
> 
> Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
> ---
>  drivers/extcon/extcon-class.c |   64 +++++++++++++++++++++++++++++++++++++++++
>  include/linux/extcon.h        |   17 +++++++++++
>  2 files changed, 81 insertions(+)
> 
> diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
> index 7ab21aa..645b02b 100644
> --- a/drivers/extcon/extcon-class.c
> +++ b/drivers/extcon/extcon-class.c
> @@ -819,6 +819,70 @@ void extcon_dev_unregister(struct extcon_dev *edev)
>  }
>  EXPORT_SYMBOL_GPL(extcon_dev_unregister);
>  
> +static void devm_extcon_dev_release(struct device *dev, void *res)
> +{
> +	extcon_dev_unregister((struct extcon_dev *)res);

'res' is double pointer. this line have to modify as following:
	extcon_dev_unregister(*(struct extcon_dev **)res);

> +}
> +
> +static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
> +{
> +	return res == data;

'res' is double pointer so this line have to modify as following:
	return *res == data;

and additionally add error exception code

	struct extcon_dev **r = res;

	if (!r || !*r) {
		WARN_ON(!r || !*r);
		return 0;
	}

	return *r == data;

> +}
> +
> +/**
> + * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
> + * @dev:	device to allocate extcon device
> + * @edev:	the new extcon device to register
> + *
> + * Managed extcon_dev_register() function. If extcon device is attached with
> + * this function, that extcon device is automatically unregistered on driver
> + * detach. Internally this function calls extcon_dev_register() function.
> + * To get more information, refer that function.
> + *
> + * If extcon device is registered with this function and the device needs to be
> + * unregistered separately, devm_extcon_dev_unregister() should be used.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
> +{
> +	struct extcon_dev **ptr;
> +	int ret;
> +
> +	ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr),
> +			GFP_KERNEL);
> +	if (!ptr)
> +		return -ENOMEM;
> +
> +	ret = extcon_dev_register(edev);
> +	if (ret) {
> +		devres_free(ptr);
> +		return ret;
> +	}
> +
> +	*ptr = edev;
> +	devres_add(dev, ptr);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
> +
> +/**
> + * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
> + * @dev:	device the extcon belongs to
> + * @edev:	the extcon device to unregister
> + *
> + * Unregister extcon device that is registered with devm_extcon_dev_register()
> + * function.
> + */
> +void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
> +{
> +	WARN_ON(devres_release(dev, devm_extcon_dev_release,
> +			devm_extcon_dev_match, edev));

Need to keep the indentation for readability.

> +}
> +EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
> +
>  #ifdef CONFIG_OF
>  /*
>   * extcon_get_edev_by_phandle - Get the extcon device from devicetree
> diff --git a/include/linux/extcon.h b/include/linux/extcon.h
> index f488145..6a17f69 100644
> --- a/include/linux/extcon.h
> +++ b/include/linux/extcon.h
> @@ -188,6 +188,14 @@ extern void extcon_dev_unregister(struct extcon_dev *edev);
>  extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
>  
>  /*
> + * Resource-managed extcon device register function.
> + */
> +extern int devm_extcon_dev_register(struct device *dev,
> +				    struct extcon_dev *edev);
> +extern void devm_extcon_dev_unregister(struct device *dev,
> +				       struct extcon_dev *edev);
> +
> +/*
>   * get/set/update_state access the 32b encoded state value, which represents
>   * states of all possible cables of the multistate port. For example, if one
>   * calls extcon_set_state(edev, 0x7), it may mean that all the three cables
> @@ -254,6 +262,15 @@ static inline int extcon_dev_register(struct extcon_dev *edev)
>  
>  static inline void extcon_dev_unregister(struct extcon_dev *edev) { }
>  
> +static inline devm_extcon_dev_register(struct device *dev,

Missing the vairable type of return value.

> +				       struct extcon_dev *edev)
> +{
> +	return 0;
> +}
> +
> +static inline devm_extcon_dev_unregister(struct device *dev,

Missing the vairable type of return value.

> +					 struct extcon_dev *edev) { }
> +
>  static inline u32 extcon_get_state(struct extcon_dev *edev)
>  {
>  	return 0;
> 

[PATCHv4 2/8] extcon: adc-jack: Use devm_extcon_dev_register()

[Sangjung Woo]

Use the resource-managed extcon device register function (i.e.
devm_extcon_dev_register()) instead of extcon_dev_register(). If extcon device
is attached with this function, that extcon device is automatically unregistered
on driver detach. That reduces tiresome managing code.

Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
---
 drivers/extcon/extcon-adc-jack.c |   30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c
index e23f1c2..549d820 100644
--- a/drivers/extcon/extcon-adc-jack.c
+++ b/drivers/extcon/extcon-adc-jack.c
@@ -105,9 +105,8 @@ static int adc_jack_probe(struct platform_device *pdev)
 	data->edev.name = pdata->name;
 
 	if (!pdata->cable_names) {
-		err = -EINVAL;
 		dev_err(&pdev->dev, "error: cable_names not defined.\n");
-		goto out;
+		return -EINVAL;
 	}
 
 	data->edev.dev.parent = &pdev->dev;
@@ -117,18 +116,16 @@ static int adc_jack_probe(struct platform_device *pdev)
 	for (i = 0; data->edev.supported_cable[i]; i++)
 		;
 	if (i == 0 || i > SUPPORTED_CABLE_MAX) {
-		err = -EINVAL;
 		dev_err(&pdev->dev, "error: pdata->cable_names size = %d\n",
 				i - 1);
-		goto out;
+		return -EINVAL;
 	}
 	data->num_cables = i;
 
 	if (!pdata->adc_conditions ||
 			!pdata->adc_conditions[0].state) {
-		err = -EINVAL;
 		dev_err(&pdev->dev, "error: adc_conditions not defined.\n");
-		goto out;
+		return -EINVAL;
 	}
 	data->adc_conditions = pdata->adc_conditions;
 
@@ -138,10 +135,8 @@ static int adc_jack_probe(struct platform_device *pdev)
 	data->num_conditions = i;
 
 	data->chan = iio_channel_get(&pdev->dev, pdata->consumer_channel);
-	if (IS_ERR(data->chan)) {
-		err = PTR_ERR(data->chan);
-		goto out;
-	}
+	if (IS_ERR(data->chan))
+		return PTR_ERR(data->chan);
 
 	data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
 
@@ -149,15 +144,14 @@ static int adc_jack_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, data);
 
-	err = extcon_dev_register(&data->edev);
+	err = devm_extcon_dev_register(&pdev->dev, &data->edev);
 	if (err)
-		goto out;
+		return err;
 
 	data->irq = platform_get_irq(pdev, 0);
 	if (!data->irq) {
 		dev_err(&pdev->dev, "platform_get_irq failed\n");
-		err = -ENODEV;
-		goto err_irq;
+		return -ENODEV;
 	}
 
 	err = request_any_context_irq(data->irq, adc_jack_irq_thread,
@@ -165,15 +159,10 @@ static int adc_jack_probe(struct platform_device *pdev)
 
 	if (err < 0) {
 		dev_err(&pdev->dev, "error: irq %d\n", data->irq);
-		goto err_irq;
+		return err;
 	}
 
 	return 0;
-
-err_irq:
-	extcon_dev_unregister(&data->edev);
-out:
-	return err;
 }
 
 static int adc_jack_remove(struct platform_device *pdev)
@@ -182,7 +171,6 @@ static int adc_jack_remove(struct platform_device *pdev)
 
 	free_irq(data->irq, data);
 	cancel_work_sync(&data->handler.work);
-	extcon_dev_unregister(&data->edev);
 
 	return 0;
 }
-- 
1.7.9.5

[PATCHv4 3/8] extcon: gpio: Use devm_extcon_dev_register()

[Sangjung Woo]

Use the resource-managed extcon device register function (i.e.
devm_extcon_dev_register()) instead of extcon_dev_register(). If extcon device
is attached with this function, that extcon device is automatically unregistered
on driver detach. That reduces tiresome managing code.

Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
---
 drivers/extcon/extcon-gpio.c |   16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 13d5222..43af34c 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -121,34 +121,27 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 				msecs_to_jiffies(pdata->debounce);
 	}
 
-	ret = extcon_dev_register(&extcon_data->edev);
+	ret = devm_extcon_dev_register(&pdev->dev, &extcon_data->edev);
 	if (ret < 0)
 		return ret;
 
 	INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work);
 
 	extcon_data->irq = gpio_to_irq(extcon_data->gpio);
-	if (extcon_data->irq < 0) {
-		ret = extcon_data->irq;
-		goto err;
-	}
+	if (extcon_data->irq < 0)
+		return extcon_data->irq;
 
 	ret = request_any_context_irq(extcon_data->irq, gpio_irq_handler,
 				      pdata->irq_flags, pdev->name,
 				      extcon_data);
 	if (ret < 0)
-		goto err;
+		return ret;
 
 	platform_set_drvdata(pdev, extcon_data);
 	/* Perform initial detection */
 	gpio_extcon_work(&extcon_data->work.work);
 
 	return 0;
-
-err:
-	extcon_dev_unregister(&extcon_data->edev);
-
-	return ret;
 }
 
 static int gpio_extcon_remove(struct platform_device *pdev)
@@ -157,7 +150,6 @@ static int gpio_extcon_remove(struct platform_device *pdev)
 
 	cancel_delayed_work_sync(&extcon_data->work);
 	free_irq(extcon_data->irq, extcon_data);
-	extcon_dev_unregister(&extcon_data->edev);
 
 	return 0;
 }
-- 
1.7.9.5

[PATCHv4 4/8] extcon: max14577: Use devm_extcon_dev_register()

[Sangjung Woo]

Use the resource-managed extcon device register function (i.e.
devm_extcon_dev_register()) instead of extcon_dev_register(). If extcon device
is attached with this function, that extcon device is automatically unregistered
on driver detach. That reduces tiresome managing code.

Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
 drivers/extcon/extcon-max14577.c |    9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/extcon/extcon-max14577.c b/drivers/extcon/extcon-max14577.c
index 1fef08d..c6166e7 100644
--- a/drivers/extcon/extcon-max14577.c
+++ b/drivers/extcon/extcon-max14577.c
@@ -675,7 +675,7 @@ static int max14577_muic_probe(struct platform_device *pdev)
 	}
 	info->edev->name = DEV_NAME;
 	info->edev->supported_cable = max14577_extcon_cable;
-	ret = extcon_dev_register(info->edev);
+	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register extcon device\n");
 		return ret;
@@ -694,7 +694,7 @@ static int max14577_muic_probe(struct platform_device *pdev)
 			MAX14577_REG_DEVICEID, &id);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to read revision number\n");
-		goto err_extcon;
+		return ret;
 	}
 	dev_info(info->dev, "device ID : 0x%x\n", id);
 
@@ -714,10 +714,6 @@ static int max14577_muic_probe(struct platform_device *pdev)
 			delay_jiffies);
 
 	return ret;
-
-err_extcon:
-	extcon_dev_unregister(info->edev);
-	return ret;
 }
 
 static int max14577_muic_remove(struct platform_device *pdev)
@@ -725,7 +721,6 @@ static int max14577_muic_remove(struct platform_device *pdev)
 	struct max14577_muic_info *info = platform_get_drvdata(pdev);
 
 	cancel_work_sync(&info->irq_work);
-	extcon_dev_unregister(info->edev);
 
 	return 0;
 }
-- 
1.7.9.5

[PATCHv4 5/8] extcon: max77693: Use devm_extcon_dev_register()

[Sangjung Woo]

Use the resource-managed extcon device register function (i.e.
devm_extcon_dev_register()) instead of extcon_dev_register(). If extcon device
is attached with this function, that extcon device is automatically unregistered
on driver detach. That reduces tiresome managing code.

Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
 drivers/extcon/extcon-max77693.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
index 39cd095..f0f18e2 100644
--- a/drivers/extcon/extcon-max77693.c
+++ b/drivers/extcon/extcon-max77693.c
@@ -1185,7 +1185,7 @@ static int max77693_muic_probe(struct platform_device *pdev)
 	info->edev->name = DEV_NAME;
 	info->edev->dev.parent = &pdev->dev;
 	info->edev->supported_cable = max77693_extcon_cable;
-	ret = extcon_dev_register(info->edev);
+	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register extcon device\n");
 		goto err_irq;
@@ -1267,7 +1267,7 @@ static int max77693_muic_probe(struct platform_device *pdev)
 			MAX77693_MUIC_REG_ID, &id);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to read revision number\n");
-		goto err_extcon;
+		goto err_irq;
 	}
 	dev_info(info->dev, "device ID : 0x%x\n", id);
 
@@ -1288,8 +1288,6 @@ static int max77693_muic_probe(struct platform_device *pdev)
 
 	return ret;
 
-err_extcon:
-	extcon_dev_unregister(info->edev);
 err_irq:
 	while (--i >= 0)
 		free_irq(muic_irqs[i].virq, info);
@@ -1305,7 +1303,6 @@ static int max77693_muic_remove(struct platform_device *pdev)
 		free_irq(muic_irqs[i].virq, info);
 	cancel_work_sync(&info->irq_work);
 	input_unregister_device(info->dock);
-	extcon_dev_unregister(info->edev);
 
 	return 0;
 }
-- 
1.7.9.5

[PATCHv4 6/8] extcon: max8997: Use devm_extcon_dev_register()

[Sangjung Woo]

Use the resource-managed extcon device register function (i.e.
devm_extcon_dev_register()) instead of extcon_dev_register(). If extcon device
is attached with this function, that extcon device is automatically unregistered
on driver detach. That reduces tiresome managing code.

Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
 drivers/extcon/extcon-max8997.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/extcon/extcon-max8997.c b/drivers/extcon/extcon-max8997.c
index 223e6b0..804a446 100644
--- a/drivers/extcon/extcon-max8997.c
+++ b/drivers/extcon/extcon-max8997.c
@@ -709,7 +709,7 @@ static int max8997_muic_probe(struct platform_device *pdev)
 	info->edev->name = DEV_NAME;
 	info->edev->dev.parent = &pdev->dev;
 	info->edev->supported_cable = max8997_extcon_cable;
-	ret = extcon_dev_register(info->edev);
+	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register extcon device\n");
 		goto err_irq;
@@ -790,8 +790,6 @@ static int max8997_muic_remove(struct platform_device *pdev)
 		free_irq(muic_irqs[i].virq, info);
 	cancel_work_sync(&info->irq_work);
 
-	extcon_dev_unregister(info->edev);
-
 	return 0;
 }
 
-- 
1.7.9.5

[PATCHv4 7/8] extcon: palmas: Use devm_extcon_dev_register()

[Sangjung Woo]

Use the resource-managed extcon device register function (i.e.
devm_extcon_dev_register()) instead of extcon_dev_register(). If extcon device
is attached with this function, that extcon device is automatically unregistered
on driver detach. That reduces tiresome managing code.

Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
---
 drivers/extcon/extcon-palmas.c |   15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index 51db5bc..1a770e0 100644
--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -192,7 +192,7 @@ static int palmas_usb_probe(struct platform_device *pdev)
 	palmas_usb->edev.name = kstrdup(node->name, GFP_KERNEL);
 	palmas_usb->edev.mutually_exclusive = mutually_exclusive;
 
-	status = extcon_dev_register(&palmas_usb->edev);
+	status = devm_extcon_dev_register(&pdev->dev, &palmas_usb->edev);
 	if (status) {
 		dev_err(&pdev->dev, "failed to register extcon device\n");
 		kfree(palmas_usb->edev.name);
@@ -209,7 +209,8 @@ static int palmas_usb_probe(struct platform_device *pdev)
 		if (status < 0) {
 			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 					palmas_usb->id_irq, status);
-			goto fail_extcon;
+			kfree(palmas_usb->edev.name);
+			return status;
 		}
 	}
 
@@ -223,26 +224,20 @@ static int palmas_usb_probe(struct platform_device *pdev)
 		if (status < 0) {
 			dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 					palmas_usb->vbus_irq, status);
-			goto fail_extcon;
+			kfree(palmas_usb->edev.name);
+			return status;
 		}
 	}
 
 	palmas_enable_irq(palmas_usb);
 	device_set_wakeup_capable(&pdev->dev, true);
 	return 0;
-
-fail_extcon:
-	extcon_dev_unregister(&palmas_usb->edev);
-	kfree(palmas_usb->edev.name);
-
-	return status;
 }
 
 static int palmas_usb_remove(struct platform_device *pdev)
 {
 	struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
 
-	extcon_dev_unregister(&palmas_usb->edev);
 	kfree(palmas_usb->edev.name);
 
 	return 0;
-- 
1.7.9.5

[PATCHv4 8/8] extcon: arizona: Use devm_extcon_dev_register()

[Sangjung Woo]

Use the resource-managed extcon device register function (i.e.
devm_extcon_dev_register()) instead of extcon_dev_register(). If extcon device
is attached with this function, that extcon device is automatically unregistered
on driver detach. That reduces tiresome managing code.

Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com>
---
 drivers/extcon/extcon-arizona.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 98a14f6..f63fa6f 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -1105,15 +1105,14 @@ static int arizona_extcon_probe(struct platform_device *pdev)
 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		dev_err(&pdev->dev, "Failed to allocate memory\n");
-		ret = -ENOMEM;
-		goto err;
+		return -ENOMEM;
 	}
 
 	info->micvdd = devm_regulator_get(arizona->dev, "MICVDD");
 	if (IS_ERR(info->micvdd)) {
 		ret = PTR_ERR(info->micvdd);
 		dev_err(arizona->dev, "Failed to get MICVDD: %d\n", ret);
-		goto err;
+		return ret;
 	}
 
 	mutex_init(&info->lock);
@@ -1155,11 +1154,11 @@ static int arizona_extcon_probe(struct platform_device *pdev)
 	info->edev.dev.parent = arizona->dev;
 	info->edev.supported_cable = arizona_cable;
 
-	ret = extcon_dev_register(&info->edev);
+	ret = devm_extcon_dev_register(&pdev->dev, &info->edev);
 	if (ret < 0) {
 		dev_err(arizona->dev, "extcon_dev_register() failed: %d\n",
 			ret);
-		goto err;
+		return ret;
 	}
 
 	info->input = devm_input_allocate_device(&pdev->dev);
@@ -1410,8 +1409,6 @@ err_rise:
 err_input:
 err_register:
 	pm_runtime_disable(&pdev->dev);
-	extcon_dev_unregister(&info->edev);
-err:
 	return ret;
 }
 
@@ -1445,7 +1442,6 @@ static int arizona_extcon_remove(struct platform_device *pdev)
 	regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 			   ARIZONA_JD1_ENA, 0);
 	arizona_clk32k_disable(arizona);
-	extcon_dev_unregister(&info->edev);
 
 	return 0;
 }
-- 
1.7.9.5

Re: [PATCHv4 0/8] Resource-managed extcon device register function

[Chanwoo Choi]

Hi Sangjung,

On 04/21/2014 07:10 PM, Sangjung Woo wrote:
> These patches add resource-managed extcon device register functions for
> developers' convenience and apply them to related device driver files.
> This work can make the code more tidy since extcon device is automatically
> unregistered on driver detach so tiresome managing codes could be removed.
> 
> 
> Changelog
> 
> v4:
> * fix the memory leak bug becuase of single pointer
> * clean up the unnecessary code and make proper indentation
> 
> v3:
> * send the right version instead of previous v1
> * add the credit for reviewers according to the review rules
> 
> v2:
> * modify and clean up all unnecessary code reported by Chanwoo
> * fix the bug reported by Seung-Woo
> * add the credit for reviewers
> 
> v1:
> * initial version
> 
> Sangjung Woo (8):
>   extcon: Add resource-managed extcon register function
>   extcon: adc-jack: Use devm_extcon_dev_register()
>   extcon: gpio: Use devm_extcon_dev_register()
>   extcon: max14577: Use devm_extcon_dev_register()
>   extcon: max77693: Use devm_extcon_dev_register()
>   extcon: max8997: Use devm_extcon_dev_register()
>   extcon: palmas: Use devm_extcon_dev_register()
>   extcon: arizona: Use devm_extcon_dev_register()
> 
>  drivers/extcon/extcon-adc-jack.c |   30 ++++++------------
>  drivers/extcon/extcon-arizona.c  |   12 +++----
>  drivers/extcon/extcon-class.c    |   64 ++++++++++++++++++++++++++++++++++++++
>  drivers/extcon/extcon-gpio.c     |   16 +++-------
>  drivers/extcon/extcon-max14577.c |    9 ++----
>  drivers/extcon/extcon-max77693.c |    7 ++---
>  drivers/extcon/extcon-max8997.c  |    4 +--
>  drivers/extcon/extcon-palmas.c   |   15 +++------
>  include/linux/extcon.h           |   17 ++++++++++
>  9 files changed, 108 insertions(+), 66 deletions(-)
> 

Applied this patchset.

But, applied below patch [1] instead of patch[2] on v4.

[1]
[PATCHv5] extcon: Add resource-managed extcon register function
- https://lkml.org/lkml/2014/4/21/140

[2] 
[PATCHv4 1/8] extcon: Add resource-managed extcon register function
- https://lkml.org/lkml/2014/4/21/128

Thanks,
Chanwoo Choi