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gpiolib: export descriptor-based GPIO interface

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This patch exports the gpiod_* family of API functions, a safer
alternative to the legacy GPIO interface. Differences between the gpiod
and legacy gpio APIs are:

- gpio works with integers, whereas gpiod operates on opaque handlers
  which cannot be forged or used before proper acquisition
- gpiod get/set functions are aware of the active low state of a GPIO
- gpio consumers should now include <linux/gpio/consumer.h> to access
  the new interface, whereas chips drivers will use
  <linux/gpio/driver.h>

The legacy gpio API is now built as inline functions on top of gpiod.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Alexandre Courbot
2013-10-17 10:21:36 -07:00
committed by Linus Walleij
parent b41fb43911
commit 79a9becda8
5 changed files with 662 additions and 366 deletions
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430
drivers/gpio/gpiolib.c
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@@ -16,16 +16,11 @@
#define CREATE_TRACE_POINTS
#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
* that aren't part of a System-On-Chip core; or across I2C/SPI/etc.
*
* 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.
* 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_TRIG_FALL 4 /* trigger on falling 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_SOURCE 8 /* Gpio is open source type */
#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);
#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 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
#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
*/
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))
return NULL;
else
return &gpio_desc[gpio];
}
EXPORT_SYMBOL_GPL(gpio_to_desc);
/**
* 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
* 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];
}
EXPORT_SYMBOL_GPL(desc_to_gpio);
/* 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;
}
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;
}
/* 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));
}
EXPORT_SYMBOL_GPL(gpiod_to_chip);
/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
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;
unsigned offset;
@@ -281,6 +263,7 @@ static int gpiod_get_direction(const struct gpio_desc *desc)
}
return status;
}
EXPORT_SYMBOL_GPL(gpiod_get_direction);
#ifdef CONFIG_GPIO_SYSFS
@@ -365,17 +348,10 @@ static ssize_t gpio_value_show(struct device *dev,
mutex_lock(&sysfs_lock);
if (!test_bit(FLAG_EXPORT, &desc->flags)) {
if (!test_bit(FLAG_EXPORT, &desc->flags))
status = -EIO;
} else {
int value;
value = !!gpiod_get_value_cansleep(desc);
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
status = sprintf(buf, "%d\n", value);
}
else
status = sprintf(buf, "%d\n", gpiod_get_value_cansleep(desc));
mutex_unlock(&sysfs_lock);
return status;
@@ -398,9 +374,7 @@ static ssize_t gpio_value_store(struct device *dev,
status = kstrtol(buf, 0, &value);
if (status == 0) {
if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
value = !value;
gpiod_set_value_cansleep(desc, value != 0);
gpiod_set_value_cansleep(desc, value);
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
* @direction_may_change: true if userspace may change gpio direction
* Context: arch_initcall or later
@@ -804,7 +778,7 @@ static struct class gpio_class = {
*
* 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;
int status;
@@ -882,12 +856,7 @@ fail_unlock:
status);
return status;
}
int gpio_export(unsigned gpio, bool direction_may_change)
{
return gpiod_export(gpio_to_desc(gpio), direction_may_change);
}
EXPORT_SYMBOL_GPL(gpio_export);
EXPORT_SYMBOL_GPL(gpiod_export);
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
* @name: name of the symlink
* @gpio: gpio to create symlink to, already exported
@@ -905,8 +874,8 @@ static int match_export(struct device *dev, const void *data)
*
* Returns zero on success, else an error.
*/
static int gpiod_export_link(struct device *dev, const char *name,
struct gpio_desc *desc)
int gpiod_export_link(struct device *dev, const char *name,
struct gpio_desc *desc)
{
int status = -EINVAL;
@@ -937,15 +906,10 @@ static int gpiod_export_link(struct device *dev, const char *name,
return status;
}
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);
EXPORT_SYMBOL_GPL(gpiod_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
* @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.
*/
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;
int status = -EINVAL;
@@ -987,20 +951,15 @@ unlock:
return status;
}
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);
EXPORT_SYMBOL_GPL(gpiod_sysfs_set_active_low);
/**
* gpio_unexport - reverse effect of gpio_export()
* gpiod_unexport - reverse effect of gpio_export()
* @gpio: gpio to make unavailable
*
* This is implicit on gpio_free().
*/
static void gpiod_unexport(struct gpio_desc *desc)
void gpiod_unexport(struct gpio_desc *desc)
{
int status = 0;
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),
status);
}
void gpio_unexport(unsigned gpio)
{
gpiod_unexport(gpio_to_desc(gpio));
}
EXPORT_SYMBOL_GPL(gpio_unexport);
EXPORT_SYMBOL_GPL(gpiod_unexport);
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 */
/*
@@ -1677,7 +1610,16 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested);
* 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;
struct gpio_chip *chip;
@@ -1734,14 +1676,19 @@ fail:
gpiod_dbg(desc, "%s status %d\n", __func__, status);
return status;
}
EXPORT_SYMBOL_GPL(gpiod_direction_input);
int gpio_direction_input(unsigned gpio)
{
return gpiod_direction_input(gpio_to_desc(gpio));
}
EXPORT_SYMBOL_GPL(gpio_direction_input);
static int gpiod_direction_output(struct gpio_desc *desc, int value)
/**
* gpiod_direction_output - set the GPIO direction to input
* @desc: GPIO to set to output
* @value: initial output value of the GPIO
*
* Set the direction of the passed GPIO to output, such as gpiod_set_value() can
* 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;
struct gpio_chip *chip;
@@ -1814,22 +1761,17 @@ fail:
gpiod_dbg(desc, "%s: gpio status %d\n", __func__, status);
return status;
}
int gpio_direction_output(unsigned gpio, int value)
{
return gpiod_direction_output(gpio_to_desc(gpio), value);
}
EXPORT_SYMBOL_GPL(gpio_direction_output);
EXPORT_SYMBOL_GPL(gpiod_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
* @debounce: debounce time is microseconds
*
* returns -ENOTSUPP if the controller does not support setting
* 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;
struct gpio_chip *chip;
@@ -1871,12 +1813,19 @@ fail:
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
* "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.
*/
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;
int value;
@@ -1914,33 +1863,54 @@ static int _gpiod_get_value(const struct gpio_desc *desc)
}
/**
* __gpio_get_value() - return a gpio's value
* @gpio: gpio whose value will be returned
* Context: any
* gpiod_get_raw_value() - return a gpio's raw value
* @desc: gpio whose value will be returned
*
* This is used directly or indirectly to implement gpio_get_value().
* It returns the zero or nonzero value provided by the associated
* gpio_chip.get() method; or zero if no such method is provided.
* Return the GPIO's raw value, i.e. the value of the physical line disregarding
* 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 int gpiod_get_value(const struct gpio_desc *desc)
int gpiod_get_raw_value(const struct gpio_desc *desc)
{
if (!desc)
return 0;
/* Should be using gpio_get_value_cansleep() */
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: Gpio whose state need to be set.
* @chip: Gpio chip.
* @desc: gpio descriptor whose state need to be set.
* @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)
@@ -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: Gpio whose state need to be set.
* @chip: Gpio chip.
* _gpio_set_open_source_value() - Set the open source gpio's value.
* @desc: gpio descriptor whose state need to be set.
* @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)
@@ -1993,7 +1962,7 @@ static void _gpio_set_open_source_value(struct gpio_desc *desc, int value)
__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;
@@ -2008,62 +1977,70 @@ static void _gpiod_set_value(struct gpio_desc *desc, int value)
}
/**
* __gpio_set_value() - assign a gpio's value
* @gpio: gpio whose value will be assigned
* gpiod_set_raw_value() - assign a gpio's raw value
* @desc: gpio whose value will be assigned
* @value: value to assign
* Context: any
*
* This is used directly or indirectly to implement gpio_set_value().
* It invokes the associated gpio_chip.set() method.
* Set the raw value of the GPIO, i.e. the value of its physical line without
* 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)
return;
/* Should be using gpio_set_value_cansleep() */
WARN_ON(desc->chip->can_sleep);
_gpiod_set_value(desc, value);
_gpiod_set_raw_value(desc, value);
}
void __gpio_set_value(unsigned gpio, int value)
{
return gpiod_set_value(gpio_to_desc(gpio), value);
}
EXPORT_SYMBOL_GPL(__gpio_set_value);
EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
/**
* __gpio_cansleep() - report whether gpio value access will sleep
* @gpio: gpio in question
* Context: any
* gpiod_set_value() - assign a gpio's value
* @desc: gpio whose value will be assigned
* @value: value to assign
*
* This is used directly or indirectly to implement gpio_cansleep(). It
* returns nonzero if access reading or writing the GPIO value can sleep.
* 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.
*/
static int gpiod_cansleep(const struct gpio_desc *desc)
void gpiod_set_value(struct gpio_desc *desc, int 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(gpiod_set_value);
/**
* gpiod_cansleep() - report whether gpio value access may sleep
* @desc: gpio to check
*
*/
int gpiod_cansleep(const struct gpio_desc *desc)
{
if (!desc)
return 0;
/* only call this on GPIOs that are valid! */
return desc->chip->can_sleep;
}
int __gpio_cansleep(unsigned gpio)
{
return gpiod_cansleep(gpio_to_desc(gpio));
}
EXPORT_SYMBOL_GPL(__gpio_cansleep);
EXPORT_SYMBOL_GPL(gpiod_cansleep);
/**
* __gpio_to_irq() - return the IRQ corresponding to a GPIO
* @gpio: gpio whose IRQ will be returned (already requested)
* Context: any
* gpiod_to_irq() - return the IRQ corresponding to a GPIO
* @desc: gpio whose IRQ will be returned (already requested)
*
* This is used directly or indirectly to implement gpio_to_irq().
* It returns the number of the IRQ signaled by this (input) GPIO,
* or a negative errno.
* Return the IRQ corresponding to the passed GPIO, or an error code in case of
* error.
*/
static int gpiod_to_irq(const struct gpio_desc *desc)
int gpiod_to_irq(const struct gpio_desc *desc)
{
struct gpio_chip *chip;
int offset;
@@ -2074,12 +2051,7 @@ static int gpiod_to_irq(const struct gpio_desc *desc)
offset = gpio_chip_hwgpio(desc);
return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO;
}
int __gpio_to_irq(unsigned gpio)
{
return gpiod_to_irq(gpio_to_desc(gpio));
}
EXPORT_SYMBOL_GPL(__gpio_to_irq);
EXPORT_SYMBOL_GPL(gpiod_to_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
* code.
*/
static int gpiod_lock_as_irq(struct gpio_desc *desc)
int gpiod_lock_as_irq(struct gpio_desc *desc)
{
if (!desc)
return -EINVAL;
@@ -2106,6 +2078,7 @@ static int gpiod_lock_as_irq(struct gpio_desc *desc)
set_bit(FLAG_USED_AS_IRQ, &desc->flags);
return 0;
}
EXPORT_SYMBOL_GPL(gpiod_lock_as_irq);
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
* 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)
return;
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)
{
@@ -2134,37 +2108,89 @@ void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
}
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.
*/
static int gpiod_get_value_cansleep(const struct gpio_desc *desc)
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
{
might_sleep_if(extra_checks);
if (!desc)
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));
}
EXPORT_SYMBOL_GPL(gpio_get_value_cansleep);
int value;
static void gpiod_set_value_cansleep(struct gpio_desc *desc, 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(gpiod_get_value_cansleep);
/**
* 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);
if (!desc)
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