gpiolib: export descriptor-based GPIO interface (79a9becd) · Commits · e / devices / android_kernel_teracube_mt6765

drivers/gpio/gpiolib.c

+224 −198

Original line number	Original line	Diff line number	Diff line
	@@ -16,16 +16,11 @@
	#define CREATE_TRACE_POINTS		#define CREATE_TRACE_POINTS
	#include <trace/events/gpio.h>		#include <trace/events/gpio.h>

	/* Optional implementation infrastructure for GPIO interfaces.		/* Implementation infrastructure for GPIO interfaces.
	*		*
	* Platforms may want to use this if they tend to use very many GPIOs		* The GPIO programming interface allows for inlining speed-critical
	* that aren't part of a System-On-Chip core; or across I2C/SPI/etc.		* get/set operations for common cases, so that access to SOC-integrated
	*		* GPIOs can sometimes cost only an instruction or two per bit.
	* When kernel footprint or instruction count is an issue, simpler
	* implementations may be preferred. The GPIO programming interface
	* allows for inlining speed-critical get/set operations for common
	* cases, so that access to SOC-integrated GPIOs can sometimes cost
	* only an instruction or two per bit.
	*/		*/


	@@ -57,7 +52,7 @@ struct gpio_desc {
	#define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */		#define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
	#define FLAG_TRIG_FALL 4 /* trigger on falling edge */		#define FLAG_TRIG_FALL 4 /* trigger on falling edge */
	#define FLAG_TRIG_RISE 5 /* trigger on rising edge */		#define FLAG_TRIG_RISE 5 /* trigger on rising edge */
	#define FLAG_ACTIVE_LOW 6 /* sysfs value has active low */		#define FLAG_ACTIVE_LOW 6 /* value has active low */
	#define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */		#define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
	#define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */		#define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
	#define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */		#define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
	@@ -81,29 +76,8 @@ static LIST_HEAD(gpio_chips);
	static DEFINE_IDR(dirent_idr);		static DEFINE_IDR(dirent_idr);
	#endif		#endif

	/*
	* Internal gpiod_* API using descriptors instead of the integer namespace.
	* Most of this should eventually go public.
	*/
	static int gpiod_request(struct gpio_desc desc, const char label);		static int gpiod_request(struct gpio_desc desc, const char label);
	static void gpiod_free(struct gpio_desc *desc);		static void gpiod_free(struct gpio_desc *desc);
	static int gpiod_direction_input(struct gpio_desc *desc);
	static int gpiod_direction_output(struct gpio_desc *desc, int value);
	static int gpiod_get_direction(const struct gpio_desc *desc);
	static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
	static int gpiod_get_value_cansleep(const struct gpio_desc *desc);
	static void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
	static int gpiod_get_value(const struct gpio_desc *desc);
	static void gpiod_set_value(struct gpio_desc *desc, int value);
	static int gpiod_cansleep(const struct gpio_desc *desc);
	static int gpiod_to_irq(const struct gpio_desc *desc);
	static int gpiod_lock_as_irq(struct gpio_desc *desc);
	static void gpiod_unlock_as_irq(struct gpio_desc *desc);
	static int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
	static int gpiod_export_link(struct device dev, const char name,
	struct gpio_desc *desc);
	static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value);
	static void gpiod_unexport(struct gpio_desc *desc);

	#ifdef CONFIG_DEBUG_FS		#ifdef CONFIG_DEBUG_FS
	#define gpiod_emerg(desc, fmt, ...) \		#define gpiod_emerg(desc, fmt, ...) \
	@@ -157,13 +131,14 @@ static int gpio_chip_hwgpio(const struct gpio_desc *desc)
	/**		/**
	* Convert a GPIO number to its descriptor		* Convert a GPIO number to its descriptor
	*/		*/
	static struct gpio_desc *gpio_to_desc(unsigned gpio)		struct gpio_desc *gpio_to_desc(unsigned gpio)
	{		{
	if (WARN(!gpio_is_valid(gpio), "invalid GPIO %d\n", gpio))		if (WARN(!gpio_is_valid(gpio), "invalid GPIO %d\n", gpio))
	return NULL;		return NULL;
	else		else
	return &gpio_desc[gpio];		return &gpio_desc[gpio];
	}		}
			EXPORT_SYMBOL_GPL(gpio_to_desc);

	/**		/**
	* Convert an offset on a certain chip to a corresponding descriptor		* Convert an offset on a certain chip to a corresponding descriptor
	@@ -181,10 +156,11 @@ static struct gpio_desc gpiochip_offset_to_desc(struct gpio_chip chip,
	* This should disappear in the future but is needed since we still		* This should disappear in the future but is needed since we still
	* use GPIO numbers for error messages and sysfs nodes		* use GPIO numbers for error messages and sysfs nodes
	*/		*/
	static int desc_to_gpio(const struct gpio_desc *desc)		int desc_to_gpio(const struct gpio_desc *desc)
	{		{
	return desc - &gpio_desc[0];		return desc - &gpio_desc[0];
	}		}
			EXPORT_SYMBOL_GPL(desc_to_gpio);


	/* Warn when drivers omit gpio_request() calls -- legal but ill-advised		/* Warn when drivers omit gpio_request() calls -- legal but ill-advised
	@@ -219,16 +195,15 @@ static int gpio_ensure_requested(struct gpio_desc *desc)
	return 0;		return 0;
	}		}

	static struct gpio_chip gpiod_to_chip(const struct gpio_desc desc)		/**
			* gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
			* @desc: descriptor to return the chip of
			*/
			struct gpio_chip gpiod_to_chip(const struct gpio_desc desc)
	{		{
	return desc ? desc->chip : NULL;		return desc ? desc->chip : NULL;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_to_chip);
	/* caller holds gpio_lock OR gpio is marked as requested */
	struct gpio_chip *gpio_to_chip(unsigned gpio)
	{
	return gpiod_to_chip(gpio_to_desc(gpio));
	}

	/* dynamic allocation of GPIOs, e.g. on a hotplugged device */		/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
	static int gpiochip_find_base(int ngpio)		static int gpiochip_find_base(int ngpio)
	@@ -254,8 +229,15 @@ static int gpiochip_find_base(int ngpio)
	}		}
	}		}

	/* caller ensures gpio is valid and requested, chip->get_direction may sleep */		/**
	static int gpiod_get_direction(const struct gpio_desc *desc)		* gpiod_get_direction - return the current direction of a GPIO
			* @desc: GPIO to get the direction of
			*
			* Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error.
			*
			* This function may sleep if gpiod_cansleep() is true.
			*/
			int gpiod_get_direction(const struct gpio_desc *desc)
	{		{
	struct gpio_chip *chip;		struct gpio_chip *chip;
	unsigned offset;		unsigned offset;
	@@ -281,6 +263,7 @@ static int gpiod_get_direction(const struct gpio_desc *desc)
	}		}
	return status;		return status;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_get_direction);

	#ifdef CONFIG_GPIO_SYSFS		#ifdef CONFIG_GPIO_SYSFS

	@@ -365,17 +348,10 @@ static ssize_t gpio_value_show(struct device *dev,

	mutex_lock(&sysfs_lock);		mutex_lock(&sysfs_lock);

	if (!test_bit(FLAG_EXPORT, &desc->flags)) {		if (!test_bit(FLAG_EXPORT, &desc->flags))
	status = -EIO;		status = -EIO;
	} else {		else
	int value;		status = sprintf(buf, "%d\n", gpiod_get_value_cansleep(desc));

	value = !!gpiod_get_value_cansleep(desc);
	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
	value = !value;

	status = sprintf(buf, "%d\n", value);
	}

	mutex_unlock(&sysfs_lock);		mutex_unlock(&sysfs_lock);
	return status;		return status;
	@@ -398,9 +374,7 @@ static ssize_t gpio_value_store(struct device *dev,

	status = kstrtol(buf, 0, &value);		status = kstrtol(buf, 0, &value);
	if (status == 0) {		if (status == 0) {
	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))		gpiod_set_value_cansleep(desc, value);
	value = !value;
	gpiod_set_value_cansleep(desc, value != 0);
	status = size;		status = size;
	}		}
	}		}
	@@ -790,7 +764,7 @@ static struct class gpio_class = {


	/**		/**
	* gpio_export - export a GPIO through sysfs		* gpiod_export - export a GPIO through sysfs
	* @gpio: gpio to make available, already requested		* @gpio: gpio to make available, already requested
	* @direction_may_change: true if userspace may change gpio direction		* @direction_may_change: true if userspace may change gpio direction
	* Context: arch_initcall or later		* Context: arch_initcall or later
	@@ -804,7 +778,7 @@ static struct class gpio_class = {
	*		*
	* Returns zero on success, else an error.		* Returns zero on success, else an error.
	*/		*/
	static int gpiod_export(struct gpio_desc *desc, bool direction_may_change)		int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
	{		{
	unsigned long flags;		unsigned long flags;
	int status;		int status;
	@@ -882,12 +856,7 @@ static int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
	status);		status);
	return status;		return status;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_export);
	int gpio_export(unsigned gpio, bool direction_may_change)
	{
	return gpiod_export(gpio_to_desc(gpio), direction_may_change);
	}
	EXPORT_SYMBOL_GPL(gpio_export);

	static int match_export(struct device dev, const void data)		static int match_export(struct device dev, const void data)
	{		{
	@@ -895,7 +864,7 @@ static int match_export(struct device dev, const void data)
	}		}

	/**		/**
	* gpio_export_link - create a sysfs link to an exported GPIO node		* gpiod_export_link - create a sysfs link to an exported GPIO node
	* @dev: device under which to create symlink		* @dev: device under which to create symlink
	* @name: name of the symlink		* @name: name of the symlink
	* @gpio: gpio to create symlink to, already exported		* @gpio: gpio to create symlink to, already exported
	@@ -905,7 +874,7 @@ static int match_export(struct device dev, const void data)
	*		*
	* Returns zero on success, else an error.		* Returns zero on success, else an error.
	*/		*/
	static int gpiod_export_link(struct device dev, const char name,		int gpiod_export_link(struct device dev, const char name,
	struct gpio_desc *desc)		struct gpio_desc *desc)
	{		{
	int status = -EINVAL;		int status = -EINVAL;
	@@ -937,15 +906,10 @@ static int gpiod_export_link(struct device dev, const char name,

	return status;		return status;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_export_link);
	int gpio_export_link(struct device dev, const char name, unsigned gpio)
	{
	return gpiod_export_link(dev, name, gpio_to_desc(gpio));
	}
	EXPORT_SYMBOL_GPL(gpio_export_link);

	/**		/**
	* gpio_sysfs_set_active_low - set the polarity of gpio sysfs value		* gpiod_sysfs_set_active_low - set the polarity of gpio sysfs value
	* @gpio: gpio to change		* @gpio: gpio to change
	* @value: non-zero to use active low, i.e. inverted values		* @value: non-zero to use active low, i.e. inverted values
	*		*
	@@ -956,7 +920,7 @@ EXPORT_SYMBOL_GPL(gpio_export_link);
	*		*
	* Returns zero on success, else an error.		* Returns zero on success, else an error.
	*/		*/
	static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)		int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
	{		{
	struct device *dev = NULL;		struct device *dev = NULL;
	int status = -EINVAL;		int status = -EINVAL;
	@@ -987,20 +951,15 @@ static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)

	return status;		return status;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_sysfs_set_active_low);
	int gpio_sysfs_set_active_low(unsigned gpio, int value)
	{
	return gpiod_sysfs_set_active_low(gpio_to_desc(gpio), value);
	}
	EXPORT_SYMBOL_GPL(gpio_sysfs_set_active_low);

	/**		/**
	* gpio_unexport - reverse effect of gpio_export()		* gpiod_unexport - reverse effect of gpio_export()
	* @gpio: gpio to make unavailable		* @gpio: gpio to make unavailable
	*		*
	* This is implicit on gpio_free().		* This is implicit on gpio_free().
	*/		*/
	static void gpiod_unexport(struct gpio_desc *desc)		void gpiod_unexport(struct gpio_desc *desc)
	{		{
	int status = 0;		int status = 0;
	struct device *dev = NULL;		struct device *dev = NULL;
	@@ -1033,12 +992,7 @@ static void gpiod_unexport(struct gpio_desc *desc)
	pr_debug("%s: gpio%d status %d\n", __func__, desc_to_gpio(desc),		pr_debug("%s: gpio%d status %d\n", __func__, desc_to_gpio(desc),
	status);		status);
	}		}
			EXPORT_SYMBOL_GPL(gpiod_unexport);
	void gpio_unexport(unsigned gpio)
	{
	gpiod_unexport(gpio_to_desc(gpio));
	}
	EXPORT_SYMBOL_GPL(gpio_unexport);

	static int gpiochip_export(struct gpio_chip *chip)		static int gpiochip_export(struct gpio_chip *chip)
	{		{
	@@ -1145,27 +1099,6 @@ static inline void gpiochip_unexport(struct gpio_chip *chip)
	{		{
	}		}

	static inline int gpiod_export(struct gpio_desc *desc,
	bool direction_may_change)
	{
	return -ENOSYS;
	}

	static inline int gpiod_export_link(struct device dev, const char name,
	struct gpio_desc *desc)
	{
	return -ENOSYS;
	}

	static inline int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
	{
	return -ENOSYS;
	}

	static inline void gpiod_unexport(struct gpio_desc *desc)
	{
	}

	#endif /* CONFIG_GPIO_SYSFS */		#endif /* CONFIG_GPIO_SYSFS */

	/*		/*
	@@ -1677,7 +1610,16 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested);
	* rely on gpio_request() having been called beforehand.		* rely on gpio_request() having been called beforehand.
	*/		*/

	static int gpiod_direction_input(struct gpio_desc *desc)		/**
			* gpiod_direction_input - set the GPIO direction to input
			* @desc: GPIO to set to input
			*
			* Set the direction of the passed GPIO to input, such as gpiod_get_value() can
			* be called safely on it.
			*
			* Return 0 in case of success, else an error code.
			*/
			int gpiod_direction_input(struct gpio_desc *desc)
	{		{
	unsigned long flags;		unsigned long flags;
	struct gpio_chip *chip;		struct gpio_chip *chip;
	@@ -1734,14 +1676,19 @@ static int gpiod_direction_input(struct gpio_desc *desc)
	gpiod_dbg(desc, "%s status %d\n", __func__, status);		gpiod_dbg(desc, "%s status %d\n", __func__, status);
	return status;		return status;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_direction_input);

	int gpio_direction_input(unsigned gpio)		/**
	{		* gpiod_direction_output - set the GPIO direction to input
	return gpiod_direction_input(gpio_to_desc(gpio));		* @desc: GPIO to set to output
	}		* @value: initial output value of the GPIO
	EXPORT_SYMBOL_GPL(gpio_direction_input);		*
			* Set the direction of the passed GPIO to output, such as gpiod_set_value() can
	static int gpiod_direction_output(struct gpio_desc *desc, int value)		* be called safely on it. The initial value of the output must be specified.
			*
			* Return 0 in case of success, else an error code.
			*/
			int gpiod_direction_output(struct gpio_desc *desc, int value)
	{		{
	unsigned long flags;		unsigned long flags;
	struct gpio_chip *chip;		struct gpio_chip *chip;
	@@ -1814,22 +1761,17 @@ static int gpiod_direction_output(struct gpio_desc *desc, int value)
	gpiod_dbg(desc, "%s: gpio status %d\n", __func__, status);		gpiod_dbg(desc, "%s: gpio status %d\n", __func__, status);
	return status;		return status;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_direction_output);
	int gpio_direction_output(unsigned gpio, int value)
	{
	return gpiod_direction_output(gpio_to_desc(gpio), value);
	}
	EXPORT_SYMBOL_GPL(gpio_direction_output);

	/**		/**
	* gpio_set_debounce - sets @debounce time for a @gpio		* gpiod_set_debounce - sets @debounce time for a @gpio
	* @gpio: the gpio to set debounce time		* @gpio: the gpio to set debounce time
	* @debounce: debounce time is microseconds		* @debounce: debounce time is microseconds
	*		*
	* returns -ENOTSUPP if the controller does not support setting		* returns -ENOTSUPP if the controller does not support setting
	* debounce.		* debounce.
	*/		*/
	static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)		int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
	{		{
	unsigned long flags;		unsigned long flags;
	struct gpio_chip *chip;		struct gpio_chip *chip;
	@@ -1871,12 +1813,19 @@ static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)

	return status;		return status;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_set_debounce);

	int gpio_set_debounce(unsigned gpio, unsigned debounce)		/**
			* gpiod_is_active_low - test whether a GPIO is active-low or not
			* @desc: the gpio descriptor to test
			*
			* Returns 1 if the GPIO is active-low, 0 otherwise.
			*/
			int gpiod_is_active_low(const struct gpio_desc *desc)
	{		{
	return gpiod_set_debounce(gpio_to_desc(gpio), debounce);		return test_bit(FLAG_ACTIVE_LOW, &desc->flags);
	}		}
	EXPORT_SYMBOL_GPL(gpio_set_debounce);		EXPORT_SYMBOL_GPL(gpiod_is_active_low);

	/* I/O calls are only valid after configuration completed; the relevant		/* I/O calls are only valid after configuration completed; the relevant
	* "is this a valid GPIO" error checks should already have been done.		* "is this a valid GPIO" error checks should already have been done.
	@@ -1900,7 +1849,7 @@ EXPORT_SYMBOL_GPL(gpio_set_debounce);
	* that the GPIO was actually requested.		* that the GPIO was actually requested.
	*/		*/

	static int _gpiod_get_value(const struct gpio_desc *desc)		static int _gpiod_get_raw_value(const struct gpio_desc *desc)
	{		{
	struct gpio_chip *chip;		struct gpio_chip *chip;
	int value;		int value;
	@@ -1914,33 +1863,54 @@ static int _gpiod_get_value(const struct gpio_desc *desc)
	}		}

	/**		/**
	* __gpio_get_value() - return a gpio's value		* gpiod_get_raw_value() - return a gpio's raw value
	* @gpio: gpio whose value will be returned		* @desc: gpio whose value will be returned
	* Context: any		*
			* Return the GPIO's raw value, i.e. the value of the physical line disregarding
			* its ACTIVE_LOW status.
	*		*
	* This is used directly or indirectly to implement gpio_get_value().		* This function should be called from contexts where we cannot sleep, and will
	* It returns the zero or nonzero value provided by the associated		* complain if the GPIO chip functions potentially sleep.
	* gpio_chip.get() method; or zero if no such method is provided.
	*/		*/
	static int gpiod_get_value(const struct gpio_desc *desc)		int gpiod_get_raw_value(const struct gpio_desc *desc)
	{		{
	if (!desc)		if (!desc)
	return 0;		return 0;
	/* Should be using gpio_get_value_cansleep() */		/* Should be using gpio_get_value_cansleep() */
	WARN_ON(desc->chip->can_sleep);		WARN_ON(desc->chip->can_sleep);
	return _gpiod_get_value(desc);		return _gpiod_get_raw_value(desc);
	}		}
			EXPORT_SYMBOL_GPL(gpiod_get_raw_value);

	int __gpio_get_value(unsigned gpio)		/**
			* gpiod_get_value() - return a gpio's value
			* @desc: gpio whose value will be returned
			*
			* Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into
			* account.
			*
			* This function should be called from contexts where we cannot sleep, and will
			* complain if the GPIO chip functions potentially sleep.
			*/
			int gpiod_get_value(const struct gpio_desc *desc)
	{		{
	return gpiod_get_value(gpio_to_desc(gpio));		int value;
			if (!desc)
			return 0;
			/* Should be using gpio_get_value_cansleep() */
			WARN_ON(desc->chip->can_sleep);

			value = _gpiod_get_raw_value(desc);
			if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
			value = !value;

			return value;
	}		}
	EXPORT_SYMBOL_GPL(__gpio_get_value);		EXPORT_SYMBOL_GPL(gpiod_get_value);

	/*		/*
	* _gpio_set_open_drain_value() - Set the open drain gpio's value.		* _gpio_set_open_drain_value() - Set the open drain gpio's value.
	* @gpio: Gpio whose state need to be set.		* @desc: gpio descriptor whose state need to be set.
	* @chip: Gpio chip.
	* @value: Non-zero for setting it HIGH otherise it will set to LOW.		* @value: Non-zero for setting it HIGH otherise it will set to LOW.
	*/		*/
	static void _gpio_set_open_drain_value(struct gpio_desc *desc, int value)		static void _gpio_set_open_drain_value(struct gpio_desc *desc, int value)
	@@ -1966,9 +1936,8 @@ static void _gpio_set_open_drain_value(struct gpio_desc *desc, int value)
	}		}

	/*		/*
	* _gpio_set_open_source() - Set the open source gpio's value.		* _gpio_set_open_source_value() - Set the open source gpio's value.
	* @gpio: Gpio whose state need to be set.		* @desc: gpio descriptor whose state need to be set.
	* @chip: Gpio chip.
	* @value: Non-zero for setting it HIGH otherise it will set to LOW.		* @value: Non-zero for setting it HIGH otherise it will set to LOW.
	*/		*/
	static void _gpio_set_open_source_value(struct gpio_desc *desc, int value)		static void _gpio_set_open_source_value(struct gpio_desc *desc, int value)
	@@ -1993,7 +1962,7 @@ static void _gpio_set_open_source_value(struct gpio_desc *desc, int value)
	__func__, err);		__func__, err);
	}		}

	static void _gpiod_set_value(struct gpio_desc *desc, int value)		static void _gpiod_set_raw_value(struct gpio_desc *desc, int value)
	{		{
	struct gpio_chip *chip;		struct gpio_chip *chip;

	@@ -2008,62 +1977,70 @@ static void _gpiod_set_value(struct gpio_desc *desc, int value)
	}		}

	/**		/**
	* __gpio_set_value() - assign a gpio's value		* gpiod_set_raw_value() - assign a gpio's raw value
	* @gpio: gpio whose value will be assigned		* @desc: gpio whose value will be assigned
	* @value: value to assign		* @value: value to assign
	* Context: any
	*		*
	* This is used directly or indirectly to implement gpio_set_value().		* Set the raw value of the GPIO, i.e. the value of its physical line without
	* It invokes the associated gpio_chip.set() method.		* regard for its ACTIVE_LOW status.
			*
			* This function should be called from contexts where we cannot sleep, and will
			* complain if the GPIO chip functions potentially sleep.
	*/		*/
	static void gpiod_set_value(struct gpio_desc *desc, int value)		void gpiod_set_raw_value(struct gpio_desc *desc, int value)
	{		{

	if (!desc)		if (!desc)
	return;		return;
	/* Should be using gpio_set_value_cansleep() */		/* Should be using gpio_set_value_cansleep() */
	WARN_ON(desc->chip->can_sleep);		WARN_ON(desc->chip->can_sleep);
	_gpiod_set_value(desc, value);		_gpiod_set_raw_value(desc, value);
	}		}
			EXPORT_SYMBOL_GPL(gpiod_set_raw_value);

	void __gpio_set_value(unsigned gpio, int value)		/**
			* gpiod_set_value() - assign a gpio's value
			* @desc: gpio whose value will be assigned
			* @value: value to assign
			*
			* Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
			* account
			*
			* This function should be called from contexts where we cannot sleep, and will
			* complain if the GPIO chip functions potentially sleep.
			*/
			void gpiod_set_value(struct gpio_desc *desc, int value)
	{		{
	return gpiod_set_value(gpio_to_desc(gpio), value);		if (!desc)
			return;
			/* Should be using gpio_set_value_cansleep() */
			WARN_ON(desc->chip->can_sleep);
			if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
			value = !value;
			_gpiod_set_raw_value(desc, value);
	}		}
	EXPORT_SYMBOL_GPL(__gpio_set_value);		EXPORT_SYMBOL_GPL(gpiod_set_value);

	/**		/**
	* __gpio_cansleep() - report whether gpio value access will sleep		* gpiod_cansleep() - report whether gpio value access may sleep
	* @gpio: gpio in question		* @desc: gpio to check
	* Context: any
	*		*
	* This is used directly or indirectly to implement gpio_cansleep(). It
	* returns nonzero if access reading or writing the GPIO value can sleep.
	*/		*/
	static int gpiod_cansleep(const struct gpio_desc *desc)		int gpiod_cansleep(const struct gpio_desc *desc)
	{		{
	if (!desc)		if (!desc)
	return 0;		return 0;
	/* only call this on GPIOs that are valid! */
	return desc->chip->can_sleep;		return desc->chip->can_sleep;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_cansleep);
	int __gpio_cansleep(unsigned gpio)
	{
	return gpiod_cansleep(gpio_to_desc(gpio));
	}
	EXPORT_SYMBOL_GPL(__gpio_cansleep);

	/**		/**
	* __gpio_to_irq() - return the IRQ corresponding to a GPIO		* gpiod_to_irq() - return the IRQ corresponding to a GPIO
	* @gpio: gpio whose IRQ will be returned (already requested)		* @desc: gpio whose IRQ will be returned (already requested)
	* Context: any
	*		*
	* This is used directly or indirectly to implement gpio_to_irq().		* Return the IRQ corresponding to the passed GPIO, or an error code in case of
	* It returns the number of the IRQ signaled by this (input) GPIO,		* error.
	* or a negative errno.
	*/		*/
	static int gpiod_to_irq(const struct gpio_desc *desc)		int gpiod_to_irq(const struct gpio_desc *desc)
	{		{
	struct gpio_chip *chip;		struct gpio_chip *chip;
	int offset;		int offset;
	@@ -2074,12 +2051,7 @@ static int gpiod_to_irq(const struct gpio_desc *desc)
	offset = gpio_chip_hwgpio(desc);		offset = gpio_chip_hwgpio(desc);
	return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO;		return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_to_irq);
	int __gpio_to_irq(unsigned gpio)
	{
	return gpiod_to_irq(gpio_to_desc(gpio));
	}
	EXPORT_SYMBOL_GPL(__gpio_to_irq);

	/**		/**
	* gpiod_lock_as_irq() - lock a GPIO to be used as IRQ		* gpiod_lock_as_irq() - lock a GPIO to be used as IRQ
	@@ -2091,7 +2063,7 @@ EXPORT_SYMBOL_GPL(__gpio_to_irq);
	* of its irq_chip implementation if the GPIO is known from that		* of its irq_chip implementation if the GPIO is known from that
	* code.		* code.
	*/		*/
	static int gpiod_lock_as_irq(struct gpio_desc *desc)		int gpiod_lock_as_irq(struct gpio_desc *desc)
	{		{
	if (!desc)		if (!desc)
	return -EINVAL;		return -EINVAL;
	@@ -2106,6 +2078,7 @@ static int gpiod_lock_as_irq(struct gpio_desc *desc)
	set_bit(FLAG_USED_AS_IRQ, &desc->flags);		set_bit(FLAG_USED_AS_IRQ, &desc->flags);
	return 0;		return 0;
	}		}
			EXPORT_SYMBOL_GPL(gpiod_lock_as_irq);

	int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)		int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
	{		{
	@@ -2120,13 +2093,14 @@ EXPORT_SYMBOL_GPL(gpio_lock_as_irq);
	* This is used directly by GPIO drivers that want to indicate		* This is used directly by GPIO drivers that want to indicate
	* that a certain GPIO is no longer used exclusively for IRQ.		* that a certain GPIO is no longer used exclusively for IRQ.
	*/		*/
	static void gpiod_unlock_as_irq(struct gpio_desc *desc)		void gpiod_unlock_as_irq(struct gpio_desc *desc)
	{		{
	if (!desc)		if (!desc)
	return;		return;

	clear_bit(FLAG_USED_AS_IRQ, &desc->flags);		clear_bit(FLAG_USED_AS_IRQ, &desc->flags);
	}		}
			EXPORT_SYMBOL_GPL(gpiod_unlock_as_irq);

	void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)		void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
	{		{
	@@ -2134,37 +2108,89 @@ void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
	}		}
	EXPORT_SYMBOL_GPL(gpio_unlock_as_irq);		EXPORT_SYMBOL_GPL(gpio_unlock_as_irq);

	/* There's no value in making it easy to inline GPIO calls that may sleep.		/**
	* Common examples include ones connected to I2C or SPI chips.		* gpiod_get_raw_value_cansleep() - return a gpio's raw value
			* @desc: gpio whose value will be returned
			*
			* Return the GPIO's raw value, i.e. the value of the physical line disregarding
			* its ACTIVE_LOW status.
			*
			* This function is to be called from contexts that can sleep.
	*/		*/
			int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
	static int gpiod_get_value_cansleep(const struct gpio_desc *desc)
	{		{
	might_sleep_if(extra_checks);		might_sleep_if(extra_checks);
	if (!desc)		if (!desc)
	return 0;		return 0;
	return _gpiod_get_value(desc);		return _gpiod_get_raw_value(desc);
	}		}
			EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep);

	int gpio_get_value_cansleep(unsigned gpio)		/**
			* gpiod_get_value_cansleep() - return a gpio's value
			* @desc: gpio whose value will be returned
			*
			* Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into
			* account.
			*
			* This function is to be called from contexts that can sleep.
			*/
			int gpiod_get_value_cansleep(const struct gpio_desc *desc)
	{		{
	return gpiod_get_value_cansleep(gpio_to_desc(gpio));		int value;

			might_sleep_if(extra_checks);
			if (!desc)
			return 0;

			value = _gpiod_get_raw_value(desc);
			if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
			value = !value;

			return value;
	}		}
	EXPORT_SYMBOL_GPL(gpio_get_value_cansleep);		EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);

	static void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)		/**
			* gpiod_set_raw_value_cansleep() - assign a gpio's raw value
			* @desc: gpio whose value will be assigned
			* @value: value to assign
			*
			* Set the raw value of the GPIO, i.e. the value of its physical line without
			* regard for its ACTIVE_LOW status.
			*
			* This function is to be called from contexts that can sleep.
			*/
			void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
	{		{
	might_sleep_if(extra_checks);		might_sleep_if(extra_checks);
	if (!desc)		if (!desc)
	return;		return;
	_gpiod_set_value(desc, value);		_gpiod_set_raw_value(desc, value);
	}		}
			EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep);

	void gpio_set_value_cansleep(unsigned gpio, int value)		/**
			* gpiod_set_value_cansleep() - assign a gpio's value
			* @desc: gpio whose value will be assigned
			* @value: value to assign
			*
			* Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
			* account
			*
			* This function is to be called from contexts that can sleep.
			*/
			void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
	{		{
	return gpiod_set_value_cansleep(gpio_to_desc(gpio), value);		might_sleep_if(extra_checks);
			if (!desc)
			return;

			if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
			value = !value;
			_gpiod_set_raw_value(desc, value);
	}		}
	EXPORT_SYMBOL_GPL(gpio_set_value_cansleep);		EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);

	#ifdef CONFIG_DEBUG_FS		#ifdef CONFIG_DEBUG_FS

include/asm-generic/gpio.h

+62 −160

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include/linux/gpio.h

+7 −4

Original line number	Original line	Diff line number	Diff line
	@@ -16,14 +16,17 @@
	#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT \| GPIOF_INIT_LOW)		#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT \| GPIOF_INIT_LOW)
	#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT \| GPIOF_INIT_HIGH)		#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT \| GPIOF_INIT_HIGH)

			/* Gpio pin is active-low */
			#define GPIOF_ACTIVE_LOW (1 << 2)

	/* Gpio pin is open drain */		/* Gpio pin is open drain */
	#define GPIOF_OPEN_DRAIN (1 << 2)		#define GPIOF_OPEN_DRAIN (1 << 3)

	/* Gpio pin is open source */		/* Gpio pin is open source */
	#define GPIOF_OPEN_SOURCE (1 << 3)		#define GPIOF_OPEN_SOURCE (1 << 4)

	#define GPIOF_EXPORT (1 << 4)		#define GPIOF_EXPORT (1 << 5)
	#define GPIOF_EXPORT_CHANGEABLE (1 << 5)		#define GPIOF_EXPORT_CHANGEABLE (1 << 6)
	#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)		#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
	#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT \| GPIOF_EXPORT_CHANGEABLE)		#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT \| GPIOF_EXPORT_CHANGEABLE)

include/linux/gpio/consumer.h

0 → 100644

+238 −0

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include/linux/gpio/driver.h

0 → 100644

+127 −0

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