[PATCH 1/3] extcon: gpio: Localize platform data

[PATCH 1/3] extcon: gpio: Localize platform data

[Linus Walleij]

Nothing in the entire kernel #includes <linux/extcon/extcon-gpio.h>
so move the platform data declaration inside of the driver.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/extcon/extcon-gpio.c       | 22 +++++++++++++++++-
 include/linux/extcon/extcon-gpio.h | 47 --------------------------------------
 2 files changed, 21 insertions(+), 48 deletions(-)
 delete mode 100644 include/linux/extcon/extcon-gpio.h

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index ab770adcca7e..5f88f36cc54e 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -18,7 +18,6 @@
  */
 
 #include <linux/extcon-provider.h>
-#include <linux/extcon/extcon-gpio.h>
 #include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/init.h>
@@ -29,6 +28,27 @@
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 
+/**
+ * struct gpio_extcon_pdata - A simple GPIO-controlled extcon device.
+ * @extcon_id:		The unique id of specific external connector.
+ * @gpio:		Corresponding GPIO.
+ * @gpio_active_low:	Boolean describing whether gpio active state is 1 or 0
+ *			If true, low state of gpio means active.
+ *			If false, high state of gpio means active.
+ * @debounce:		Debounce time for GPIO IRQ in ms.
+ * @irq_flags:		IRQ Flags (e.g., IRQF_TRIGGER_LOW).
+ * @check_on_resume:	Boolean describing whether to check the state of gpio
+ *			while resuming from sleep.
+ */
+struct gpio_extcon_pdata {
+	unsigned int extcon_id;
+	unsigned gpio;
+	bool gpio_active_low;
+	unsigned long debounce;
+	unsigned long irq_flags;
+	bool check_on_resume;
+};
+
 struct gpio_extcon_data {
 	struct extcon_dev *edev;
 	int irq;
diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
deleted file mode 100644
index 7cacafb78b09..000000000000
--- a/include/linux/extcon/extcon-gpio.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Single-state GPIO extcon driver based on extcon class
- *
- * Copyright (C) 2012 Samsung Electronics
- * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
- *
- * based on switch class driver
- * Copyright (C) 2008 Google, Inc.
- * Author: Mike Lockwood <lockwood@android.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-#ifndef __EXTCON_GPIO_H__
-#define __EXTCON_GPIO_H__ __FILE__
-
-#include <linux/extcon.h>
-
-/**
- * struct gpio_extcon_pdata - A simple GPIO-controlled extcon device.
- * @extcon_id:		The unique id of specific external connector.
- * @gpio:		Corresponding GPIO.
- * @gpio_active_low:	Boolean describing whether gpio active state is 1 or 0
- *			If true, low state of gpio means active.
- *			If false, high state of gpio means active.
- * @debounce:		Debounce time for GPIO IRQ in ms.
- * @irq_flags:		IRQ Flags (e.g., IRQF_TRIGGER_LOW).
- * @check_on_resume:	Boolean describing whether to check the state of gpio
- *			while resuming from sleep.
- */
-struct gpio_extcon_pdata {
-	unsigned int extcon_id;
-	unsigned gpio;
-	bool gpio_active_low;
-	unsigned long debounce;
-	unsigned long irq_flags;
-
-	bool check_on_resume;
-};
-
-#endif /* __EXTCON_GPIO_H__ */
-- 
2.14.3

[PATCH 2/3] extcon: gpio: Move platform data into state container

[Linus Walleij]

This moves the platform data settings from the platform data
struct and into the state container, saving some unnecessary
references and simplifying things a bit.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/extcon/extcon-gpio.c | 56 ++++++++++++++++++++------------------------
 1 file changed, 26 insertions(+), 30 deletions(-)

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 5f88f36cc54e..1d180f717fdf 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -29,7 +29,13 @@
 #include <linux/workqueue.h>
 
 /**
- * struct gpio_extcon_pdata - A simple GPIO-controlled extcon device.
+ * struct gpio_extcon_data - A simple GPIO-controlled extcon device state container.
+ * @edev:		Extcon device.
+ * @irq:		Interrupt line for the external connector.
+ * @work:		Work fired by the interrupt.
+ * @debounce_jiffies:	Number of jiffies to wait for the GPIO to stabilize, from the debounce
+ *			value.
+ * @id_gpiod:		GPIO descriptor for this external connector.
  * @extcon_id:		The unique id of specific external connector.
  * @gpio:		Corresponding GPIO.
  * @gpio_active_low:	Boolean describing whether gpio active state is 1 or 0
@@ -40,23 +46,18 @@
  * @check_on_resume:	Boolean describing whether to check the state of gpio
  *			while resuming from sleep.
  */
-struct gpio_extcon_pdata {
-	unsigned int extcon_id;
-	unsigned gpio;
-	bool gpio_active_low;
-	unsigned long debounce;
-	unsigned long irq_flags;
-	bool check_on_resume;
-};
-
 struct gpio_extcon_data {
 	struct extcon_dev *edev;
 	int irq;
 	struct delayed_work work;
 	unsigned long debounce_jiffies;
-
 	struct gpio_desc *id_gpiod;
-	struct gpio_extcon_pdata *pdata;
+	unsigned int extcon_id;
+	unsigned gpio;
+	bool gpio_active_low;
+	unsigned long debounce;
+	unsigned long irq_flags;
+	bool check_on_resume;
 };
 
 static void gpio_extcon_work(struct work_struct *work)
@@ -67,10 +68,10 @@ static void gpio_extcon_work(struct work_struct *work)
 			     work);
 
 	state = gpiod_get_value_cansleep(data->id_gpiod);
-	if (data->pdata->gpio_active_low)
+	if (data->gpio_active_low)
 		state = !state;
 
-	extcon_set_state_sync(data->edev, data->pdata->extcon_id, state);
+	extcon_set_state_sync(data->edev, data->extcon_id, state);
 }
 
 static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
@@ -84,24 +85,23 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
 
 static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
 {
-	struct gpio_extcon_pdata *pdata = data->pdata;
 	int ret;
 
-	ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN,
+	ret = devm_gpio_request_one(dev, data->gpio, GPIOF_DIR_IN,
 				dev_name(dev));
 	if (ret < 0)
 		return ret;
 
-	data->id_gpiod = gpio_to_desc(pdata->gpio);
+	data->id_gpiod = gpio_to_desc(data->gpio);
 	if (!data->id_gpiod)
 		return -EINVAL;
 
-	if (pdata->debounce) {
+	if (data->debounce) {
 		ret = gpiod_set_debounce(data->id_gpiod,
-					pdata->debounce * 1000);
+					 data->debounce * 1000);
 		if (ret < 0)
 			data->debounce_jiffies =
-				msecs_to_jiffies(pdata->debounce);
+				msecs_to_jiffies(data->debounce);
 	}
 
 	data->irq = gpiod_to_irq(data->id_gpiod);
@@ -113,20 +113,16 @@ static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
 
 static int gpio_extcon_probe(struct platform_device *pdev)
 {
-	struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev);
 	struct gpio_extcon_data *data;
 	int ret;
 
-	if (!pdata)
-		return -EBUSY;
-	if (!pdata->irq_flags || pdata->extcon_id > EXTCON_NONE)
-		return -EINVAL;
-
 	data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
 				   GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
-	data->pdata = pdata;
+
+	if (!data->irq_flags || data->extcon_id > EXTCON_NONE)
+		return -EINVAL;
 
 	/* Initialize the gpio */
 	ret = gpio_extcon_init(&pdev->dev, data);
@@ -134,7 +130,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 		return ret;
 
 	/* Allocate the memory of extcon devie and register extcon device */
-	data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id);
+	data->edev = devm_extcon_dev_allocate(&pdev->dev, &data->extcon_id);
 	if (IS_ERR(data->edev)) {
 		dev_err(&pdev->dev, "failed to allocate extcon device\n");
 		return -ENOMEM;
@@ -151,7 +147,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 	 * is attached or detached.
 	 */
 	ret = devm_request_any_context_irq(&pdev->dev, data->irq,
-					gpio_irq_handler, pdata->irq_flags,
+					gpio_irq_handler, data->irq_flags,
 					pdev->name, data);
 	if (ret < 0)
 		return ret;
@@ -178,7 +174,7 @@ static int gpio_extcon_resume(struct device *dev)
 	struct gpio_extcon_data *data;
 
 	data = dev_get_drvdata(dev);
-	if (data->pdata->check_on_resume)
+	if (data->check_on_resume)
 		queue_delayed_work(system_power_efficient_wq,
 			&data->work, data->debounce_jiffies);
 
-- 
2.14.3

[PATCH 3/3] extcon: gpio: Convert to fully use GPIO descriptor

[Linus Walleij]

Since we are not getting the GPIO from any platform data and global
GPIO numberspace, we simply get the named "extcon" GPIO directly from
the device. Cut away "active low" since GPIO descriptors already know
if the line is active high or low. Simplify a bit with a
struct device *dev helper variable in probe() and cut the complex
init() function.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/extcon/extcon-gpio.c | 66 ++++++++++----------------------------------
 1 file changed, 15 insertions(+), 51 deletions(-)

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 1d180f717fdf..9491e3d0645d 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -18,7 +18,6 @@
  */
 
 #include <linux/extcon-provider.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -35,12 +34,8 @@
  * @work:		Work fired by the interrupt.
  * @debounce_jiffies:	Number of jiffies to wait for the GPIO to stabilize, from the debounce
  *			value.
- * @id_gpiod:		GPIO descriptor for this external connector.
+ * @gpiod:		GPIO descriptor for this external connector.
  * @extcon_id:		The unique id of specific external connector.
- * @gpio:		Corresponding GPIO.
- * @gpio_active_low:	Boolean describing whether gpio active state is 1 or 0
- *			If true, low state of gpio means active.
- *			If false, high state of gpio means active.
  * @debounce:		Debounce time for GPIO IRQ in ms.
  * @irq_flags:		IRQ Flags (e.g., IRQF_TRIGGER_LOW).
  * @check_on_resume:	Boolean describing whether to check the state of gpio
@@ -51,10 +46,8 @@ struct gpio_extcon_data {
 	int irq;
 	struct delayed_work work;
 	unsigned long debounce_jiffies;
-	struct gpio_desc *id_gpiod;
+	struct gpio_desc *gpiod;
 	unsigned int extcon_id;
-	unsigned gpio;
-	bool gpio_active_low;
 	unsigned long debounce;
 	unsigned long irq_flags;
 	bool check_on_resume;
@@ -67,10 +60,7 @@ static void gpio_extcon_work(struct work_struct *work)
 		container_of(to_delayed_work(work), struct gpio_extcon_data,
 			     work);
 
-	state = gpiod_get_value_cansleep(data->id_gpiod);
-	if (data->gpio_active_low)
-		state = !state;
-
+	state = gpiod_get_value_cansleep(data->gpiod);
 	extcon_set_state_sync(data->edev, data->extcon_id, state);
 }
 
@@ -83,60 +73,34 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
-{
-	int ret;
-
-	ret = devm_gpio_request_one(dev, data->gpio, GPIOF_DIR_IN,
-				dev_name(dev));
-	if (ret < 0)
-		return ret;
-
-	data->id_gpiod = gpio_to_desc(data->gpio);
-	if (!data->id_gpiod)
-		return -EINVAL;
-
-	if (data->debounce) {
-		ret = gpiod_set_debounce(data->id_gpiod,
-					 data->debounce * 1000);
-		if (ret < 0)
-			data->debounce_jiffies =
-				msecs_to_jiffies(data->debounce);
-	}
-
-	data->irq = gpiod_to_irq(data->id_gpiod);
-	if (data->irq < 0)
-		return data->irq;
-
-	return 0;
-}
-
 static int gpio_extcon_probe(struct platform_device *pdev)
 {
 	struct gpio_extcon_data *data;
+	struct device *dev = &pdev->dev;
 	int ret;
 
-	data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
-				   GFP_KERNEL);
+	data = devm_kzalloc(dev, sizeof(struct gpio_extcon_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
 	if (!data->irq_flags || data->extcon_id > EXTCON_NONE)
 		return -EINVAL;
 
-	/* Initialize the gpio */
-	ret = gpio_extcon_init(&pdev->dev, data);
-	if (ret < 0)
-		return ret;
+	data->gpiod = devm_gpiod_get(dev, "extcon", GPIOD_IN);
+	if (IS_ERR(data->gpiod))
+		return PTR_ERR(data->gpiod);
+	data->irq = gpiod_to_irq(data->gpiod);
+	if (data->irq <= 0)
+		return data->irq;
 
 	/* Allocate the memory of extcon devie and register extcon device */
-	data->edev = devm_extcon_dev_allocate(&pdev->dev, &data->extcon_id);
+	data->edev = devm_extcon_dev_allocate(dev, &data->extcon_id);
 	if (IS_ERR(data->edev)) {
-		dev_err(&pdev->dev, "failed to allocate extcon device\n");
+		dev_err(dev, "failed to allocate extcon device\n");
 		return -ENOMEM;
 	}
 
-	ret = devm_extcon_dev_register(&pdev->dev, data->edev);
+	ret = devm_extcon_dev_register(dev, data->edev);
 	if (ret < 0)
 		return ret;
 
@@ -146,7 +110,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 	 * Request the interrupt of gpio to detect whether external connector
 	 * is attached or detached.
 	 */
-	ret = devm_request_any_context_irq(&pdev->dev, data->irq,
+	ret = devm_request_any_context_irq(dev, data->irq,
 					gpio_irq_handler, data->irq_flags,
 					pdev->name, data);
 	if (ret < 0)
-- 
2.14.3

Re: [PATCH 1/3] extcon: gpio: Localize platform data

[Linus Walleij]

On Mon, Feb 12, 2018 at 9:53 AM, Linus Walleij <linus.walleij@linaro.org> wrote:

> Nothing in the entire kernel #includes <linux/extcon/extcon-gpio.h>
> so move the platform data declaration inside of the driver.
>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

No reply on these patches so far,
if you prefer I can just apply them to the GPIO
tree.

Yours,
Linus Walleij

Re: [PATCH 1/3] extcon: gpio: Localize platform data

[Chanwoo Choi]

Hi,

On 2018년 03월 01일 18:14, Linus Walleij wrote:
> On Mon, Feb 12, 2018 at 9:53 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
> 
>> Nothing in the entire kernel #includes <linux/extcon/extcon-gpio.h>
>> so move the platform data declaration inside of the driver.
>>
>> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> 
> No reply on these patches so far,
> if you prefer I can just apply them to the GPIO
> tree.

I'm sorry for late reply. The extcon-gpio.c should be solved
how to to get the unique id such as EXTCON_USB, EXTCON_DISP_HDMI and so on.
As you knew, you already tried to develop it with device-tree.
But, it is not accepted.

Even if extcon-gpio.c has a problem still to get the extcon id,
I'll apply this series. Because I don't want to remove extcon-gpio.c
and you need to clean-up the gpio library. On later, I'll try to fix this issue.

I added the 'FIXME' comment which explains the extcon_id issue
and then applied this series.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics