forked from mirrors/linux
gpiolib: export descriptor-based GPIO interface
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
Linus Walleij
parent
b41fb43911
commit
79a9becda8
5 changed files with 662 additions and 366 deletions
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@ -16,16 +16,11 @@
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#define CREATE_TRACE_POINTS
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#include <trace/events/gpio.h>
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/* Optional implementation infrastructure for GPIO interfaces.
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/* Implementation infrastructure for GPIO interfaces.
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*
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* Platforms may want to use this if they tend to use very many GPIOs
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* that aren't part of a System-On-Chip core; or across I2C/SPI/etc.
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*
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* When kernel footprint or instruction count is an issue, simpler
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* implementations may be preferred. The GPIO programming interface
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* allows for inlining speed-critical get/set operations for common
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* cases, so that access to SOC-integrated GPIOs can sometimes cost
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* only an instruction or two per bit.
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* The GPIO programming interface allows for inlining speed-critical
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* get/set operations for common cases, so that access to SOC-integrated
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* GPIOs can sometimes cost only an instruction or two per bit.
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*/
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@ -57,7 +52,7 @@ struct gpio_desc {
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#define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
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#define FLAG_TRIG_FALL 4 /* trigger on falling edge */
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#define FLAG_TRIG_RISE 5 /* trigger on rising edge */
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#define FLAG_ACTIVE_LOW 6 /* sysfs value has active low */
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#define FLAG_ACTIVE_LOW 6 /* value has active low */
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#define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
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#define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
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#define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
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@ -81,29 +76,8 @@ static LIST_HEAD(gpio_chips);
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static DEFINE_IDR(dirent_idr);
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#endif
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/*
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* Internal gpiod_* API using descriptors instead of the integer namespace.
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* Most of this should eventually go public.
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*/
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static int gpiod_request(struct gpio_desc *desc, const char *label);
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static void gpiod_free(struct gpio_desc *desc);
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static int gpiod_direction_input(struct gpio_desc *desc);
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static int gpiod_direction_output(struct gpio_desc *desc, int value);
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static int gpiod_get_direction(const struct gpio_desc *desc);
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static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
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static int gpiod_get_value_cansleep(const struct gpio_desc *desc);
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static void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
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static int gpiod_get_value(const struct gpio_desc *desc);
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static void gpiod_set_value(struct gpio_desc *desc, int value);
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static int gpiod_cansleep(const struct gpio_desc *desc);
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static int gpiod_to_irq(const struct gpio_desc *desc);
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static int gpiod_lock_as_irq(struct gpio_desc *desc);
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static void gpiod_unlock_as_irq(struct gpio_desc *desc);
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static int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
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static int gpiod_export_link(struct device *dev, const char *name,
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struct gpio_desc *desc);
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static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value);
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static void gpiod_unexport(struct gpio_desc *desc);
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#ifdef CONFIG_DEBUG_FS
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#define gpiod_emerg(desc, fmt, ...) \
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@ -157,13 +131,14 @@ static int gpio_chip_hwgpio(const struct gpio_desc *desc)
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/**
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* Convert a GPIO number to its descriptor
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*/
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static struct gpio_desc *gpio_to_desc(unsigned gpio)
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struct gpio_desc *gpio_to_desc(unsigned gpio)
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{
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if (WARN(!gpio_is_valid(gpio), "invalid GPIO %d\n", gpio))
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return NULL;
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else
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return &gpio_desc[gpio];
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}
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EXPORT_SYMBOL_GPL(gpio_to_desc);
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/**
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* Convert an offset on a certain chip to a corresponding descriptor
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@ -181,10 +156,11 @@ static struct gpio_desc *gpiochip_offset_to_desc(struct gpio_chip *chip,
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* This should disappear in the future but is needed since we still
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* use GPIO numbers for error messages and sysfs nodes
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*/
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static int desc_to_gpio(const struct gpio_desc *desc)
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int desc_to_gpio(const struct gpio_desc *desc)
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{
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return desc - &gpio_desc[0];
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}
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EXPORT_SYMBOL_GPL(desc_to_gpio);
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/* Warn when drivers omit gpio_request() calls -- legal but ill-advised
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@ -219,16 +195,15 @@ static int gpio_ensure_requested(struct gpio_desc *desc)
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return 0;
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}
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static struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
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/**
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* gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
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* @desc: descriptor to return the chip of
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*/
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struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
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{
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return desc ? desc->chip : NULL;
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}
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/* caller holds gpio_lock *OR* gpio is marked as requested */
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struct gpio_chip *gpio_to_chip(unsigned gpio)
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{
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return gpiod_to_chip(gpio_to_desc(gpio));
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}
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EXPORT_SYMBOL_GPL(gpiod_to_chip);
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/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
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static int gpiochip_find_base(int ngpio)
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@ -254,8 +229,15 @@ static int gpiochip_find_base(int ngpio)
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}
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}
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/* caller ensures gpio is valid and requested, chip->get_direction may sleep */
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static int gpiod_get_direction(const struct gpio_desc *desc)
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/**
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* gpiod_get_direction - return the current direction of a GPIO
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* @desc: GPIO to get the direction of
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*
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* Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error.
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*
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* This function may sleep if gpiod_cansleep() is true.
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*/
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int gpiod_get_direction(const struct gpio_desc *desc)
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{
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struct gpio_chip *chip;
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unsigned offset;
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@ -281,6 +263,7 @@ static int gpiod_get_direction(const struct gpio_desc *desc)
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}
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return status;
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}
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EXPORT_SYMBOL_GPL(gpiod_get_direction);
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#ifdef CONFIG_GPIO_SYSFS
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@ -365,17 +348,10 @@ static ssize_t gpio_value_show(struct device *dev,
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mutex_lock(&sysfs_lock);
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if (!test_bit(FLAG_EXPORT, &desc->flags)) {
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if (!test_bit(FLAG_EXPORT, &desc->flags))
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status = -EIO;
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} else {
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int value;
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value = !!gpiod_get_value_cansleep(desc);
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if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
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value = !value;
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status = sprintf(buf, "%d\n", value);
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}
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else
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status = sprintf(buf, "%d\n", gpiod_get_value_cansleep(desc));
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mutex_unlock(&sysfs_lock);
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return status;
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@ -398,9 +374,7 @@ static ssize_t gpio_value_store(struct device *dev,
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status = kstrtol(buf, 0, &value);
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if (status == 0) {
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if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
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value = !value;
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gpiod_set_value_cansleep(desc, value != 0);
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gpiod_set_value_cansleep(desc, value);
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status = size;
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}
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}
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@ -790,7 +764,7 @@ static struct class gpio_class = {
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/**
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* gpio_export - export a GPIO through sysfs
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* gpiod_export - export a GPIO through sysfs
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* @gpio: gpio to make available, already requested
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* @direction_may_change: true if userspace may change gpio direction
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* Context: arch_initcall or later
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@ -804,7 +778,7 @@ static struct class gpio_class = {
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*
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* Returns zero on success, else an error.
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*/
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static int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
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int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
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{
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unsigned long flags;
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int status;
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@ -882,12 +856,7 @@ static int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
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status);
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return status;
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}
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int gpio_export(unsigned gpio, bool direction_may_change)
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{
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return gpiod_export(gpio_to_desc(gpio), direction_may_change);
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}
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EXPORT_SYMBOL_GPL(gpio_export);
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EXPORT_SYMBOL_GPL(gpiod_export);
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static int match_export(struct device *dev, const void *data)
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{
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@ -895,7 +864,7 @@ static int match_export(struct device *dev, const void *data)
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}
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/**
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* gpio_export_link - create a sysfs link to an exported GPIO node
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* gpiod_export_link - create a sysfs link to an exported GPIO node
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* @dev: device under which to create symlink
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* @name: name of the symlink
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* @gpio: gpio to create symlink to, already exported
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@ -905,8 +874,8 @@ static int match_export(struct device *dev, const void *data)
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*
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* Returns zero on success, else an error.
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*/
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static int gpiod_export_link(struct device *dev, const char *name,
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struct gpio_desc *desc)
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int gpiod_export_link(struct device *dev, const char *name,
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struct gpio_desc *desc)
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{
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int status = -EINVAL;
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@ -937,15 +906,10 @@ static int gpiod_export_link(struct device *dev, const char *name,
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return status;
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}
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int gpio_export_link(struct device *dev, const char *name, unsigned gpio)
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{
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return gpiod_export_link(dev, name, gpio_to_desc(gpio));
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}
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EXPORT_SYMBOL_GPL(gpio_export_link);
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EXPORT_SYMBOL_GPL(gpiod_export_link);
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/**
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* gpio_sysfs_set_active_low - set the polarity of gpio sysfs value
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* gpiod_sysfs_set_active_low - set the polarity of gpio sysfs value
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* @gpio: gpio to change
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* @value: non-zero to use active low, i.e. inverted values
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*
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@ -956,7 +920,7 @@ EXPORT_SYMBOL_GPL(gpio_export_link);
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*
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* Returns zero on success, else an error.
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*/
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static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
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int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
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{
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struct device *dev = NULL;
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int status = -EINVAL;
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@ -987,20 +951,15 @@ static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
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return status;
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}
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int gpio_sysfs_set_active_low(unsigned gpio, int value)
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{
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return gpiod_sysfs_set_active_low(gpio_to_desc(gpio), value);
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}
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EXPORT_SYMBOL_GPL(gpio_sysfs_set_active_low);
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EXPORT_SYMBOL_GPL(gpiod_sysfs_set_active_low);
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/**
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* gpio_unexport - reverse effect of gpio_export()
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* gpiod_unexport - reverse effect of gpio_export()
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* @gpio: gpio to make unavailable
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*
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* This is implicit on gpio_free().
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*/
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static void gpiod_unexport(struct gpio_desc *desc)
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void gpiod_unexport(struct gpio_desc *desc)
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{
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int status = 0;
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struct device *dev = NULL;
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@ -1033,12 +992,7 @@ static void gpiod_unexport(struct gpio_desc *desc)
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pr_debug("%s: gpio%d status %d\n", __func__, desc_to_gpio(desc),
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status);
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}
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void gpio_unexport(unsigned gpio)
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{
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gpiod_unexport(gpio_to_desc(gpio));
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}
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EXPORT_SYMBOL_GPL(gpio_unexport);
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EXPORT_SYMBOL_GPL(gpiod_unexport);
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static int gpiochip_export(struct gpio_chip *chip)
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{
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@ -1145,27 +1099,6 @@ static inline void gpiochip_unexport(struct gpio_chip *chip)
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{
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}
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static inline int gpiod_export(struct gpio_desc *desc,
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bool direction_may_change)
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{
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return -ENOSYS;
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}
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static inline int gpiod_export_link(struct device *dev, const char *name,
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struct gpio_desc *desc)
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{
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return -ENOSYS;
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}
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static inline int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
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{
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return -ENOSYS;
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}
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static inline void gpiod_unexport(struct gpio_desc *desc)
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{
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}
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#endif /* CONFIG_GPIO_SYSFS */
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/*
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@ -1677,7 +1610,16 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested);
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* rely on gpio_request() having been called beforehand.
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*/
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static int gpiod_direction_input(struct gpio_desc *desc)
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/**
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* gpiod_direction_input - set the GPIO direction to input
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* @desc: GPIO to set to input
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*
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* Set the direction of the passed GPIO to input, such as gpiod_get_value() can
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* be called safely on it.
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*
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* Return 0 in case of success, else an error code.
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*/
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int gpiod_direction_input(struct gpio_desc *desc)
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{
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unsigned long flags;
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struct gpio_chip *chip;
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@ -1734,14 +1676,19 @@ static int gpiod_direction_input(struct gpio_desc *desc)
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gpiod_dbg(desc, "%s status %d\n", __func__, status);
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return status;
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}
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EXPORT_SYMBOL_GPL(gpiod_direction_input);
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int gpio_direction_input(unsigned gpio)
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{
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return gpiod_direction_input(gpio_to_desc(gpio));
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}
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EXPORT_SYMBOL_GPL(gpio_direction_input);
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static int gpiod_direction_output(struct gpio_desc *desc, int value)
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/**
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* gpiod_direction_output - set the GPIO direction to input
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* @desc: GPIO to set to output
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* @value: initial output value of the GPIO
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*
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* Set the direction of the passed GPIO to output, such as gpiod_set_value() can
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* be called safely on it. The initial value of the output must be specified.
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*
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* Return 0 in case of success, else an error code.
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*/
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int gpiod_direction_output(struct gpio_desc *desc, int value)
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{
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unsigned long flags;
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struct gpio_chip *chip;
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@ -1814,22 +1761,17 @@ static int gpiod_direction_output(struct gpio_desc *desc, int value)
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gpiod_dbg(desc, "%s: gpio status %d\n", __func__, status);
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return status;
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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return gpiod_direction_output(gpio_to_desc(gpio), value);
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}
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EXPORT_SYMBOL_GPL(gpio_direction_output);
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EXPORT_SYMBOL_GPL(gpiod_direction_output);
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/**
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* gpio_set_debounce - sets @debounce time for a @gpio
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* gpiod_set_debounce - sets @debounce time for a @gpio
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* @gpio: the gpio to set debounce time
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* @debounce: debounce time is microseconds
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*
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* returns -ENOTSUPP if the controller does not support setting
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* debounce.
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*/
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static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
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int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
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{
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unsigned long flags;
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struct gpio_chip *chip;
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@ -1871,12 +1813,19 @@ static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
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return status;
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}
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EXPORT_SYMBOL_GPL(gpiod_set_debounce);
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int gpio_set_debounce(unsigned gpio, unsigned debounce)
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/**
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* gpiod_is_active_low - test whether a GPIO is active-low or not
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* @desc: the gpio descriptor to test
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*
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* Returns 1 if the GPIO is active-low, 0 otherwise.
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*/
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int gpiod_is_active_low(const struct gpio_desc *desc)
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{
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return gpiod_set_debounce(gpio_to_desc(gpio), debounce);
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return test_bit(FLAG_ACTIVE_LOW, &desc->flags);
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}
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EXPORT_SYMBOL_GPL(gpio_set_debounce);
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EXPORT_SYMBOL_GPL(gpiod_is_active_low);
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/* I/O calls are only valid after configuration completed; the relevant
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* "is this a valid GPIO" error checks should already have been done.
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@ -1900,7 +1849,7 @@ EXPORT_SYMBOL_GPL(gpio_set_debounce);
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* that the GPIO was actually requested.
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*/
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static int _gpiod_get_value(const struct gpio_desc *desc)
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static int _gpiod_get_raw_value(const struct gpio_desc *desc)
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{
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struct gpio_chip *chip;
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int value;
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@ -1914,33 +1863,54 @@ static int _gpiod_get_value(const struct gpio_desc *desc)
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}
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/**
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* __gpio_get_value() - return a gpio's value
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* @gpio: gpio whose value will be returned
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* 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
|
||||
|
||||
|
|
|
|||
|
|
@ -10,6 +10,8 @@
|
|||
#ifdef CONFIG_GPIOLIB
|
||||
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/gpio/driver.h>
|
||||
#include <linux/gpio/consumer.h>
|
||||
|
||||
/* Platforms may implement their GPIO interface with library code,
|
||||
* at a small performance cost for non-inlined operations and some
|
||||
|
|
@ -49,122 +51,11 @@ struct module;
|
|||
struct device_node;
|
||||
struct gpio_desc;
|
||||
|
||||
/**
|
||||
* struct gpio_chip - abstract a GPIO controller
|
||||
* @label: for diagnostics
|
||||
* @dev: optional device providing the GPIOs
|
||||
* @owner: helps prevent removal of modules exporting active GPIOs
|
||||
* @list: links gpio_chips together for traversal
|
||||
* @request: optional hook for chip-specific activation, such as
|
||||
* enabling module power and clock; may sleep
|
||||
* @free: optional hook for chip-specific deactivation, such as
|
||||
* disabling module power and clock; may sleep
|
||||
* @get_direction: returns direction for signal "offset", 0=out, 1=in,
|
||||
* (same as GPIOF_DIR_XXX), or negative error
|
||||
* @direction_input: configures signal "offset" as input, or returns error
|
||||
* @get: returns value for signal "offset"; for output signals this
|
||||
* returns either the value actually sensed, or zero
|
||||
* @direction_output: configures signal "offset" as output, or returns error
|
||||
* @set_debounce: optional hook for setting debounce time for specified gpio in
|
||||
* interrupt triggered gpio chips
|
||||
* @set: assigns output value for signal "offset"
|
||||
* @to_irq: optional hook supporting non-static gpio_to_irq() mappings;
|
||||
* implementation may not sleep
|
||||
* @dbg_show: optional routine to show contents in debugfs; default code
|
||||
* will be used when this is omitted, but custom code can show extra
|
||||
* state (such as pullup/pulldown configuration).
|
||||
* @base: identifies the first GPIO number handled by this chip; or, if
|
||||
* negative during registration, requests dynamic ID allocation.
|
||||
* @ngpio: the number of GPIOs handled by this controller; the last GPIO
|
||||
* handled is (base + ngpio - 1).
|
||||
* @desc: array of ngpio descriptors. Private.
|
||||
* @can_sleep: flag must be set iff get()/set() methods sleep, as they
|
||||
* must while accessing GPIO expander chips over I2C or SPI
|
||||
* @names: if set, must be an array of strings to use as alternative
|
||||
* names for the GPIOs in this chip. Any entry in the array
|
||||
* may be NULL if there is no alias for the GPIO, however the
|
||||
* array must be @ngpio entries long. A name can include a single printk
|
||||
* format specifier for an unsigned int. It is substituted by the actual
|
||||
* number of the gpio.
|
||||
*
|
||||
* A gpio_chip can help platforms abstract various sources of GPIOs so
|
||||
* they can all be accessed through a common programing interface.
|
||||
* Example sources would be SOC controllers, FPGAs, multifunction
|
||||
* chips, dedicated GPIO expanders, and so on.
|
||||
*
|
||||
* Each chip controls a number of signals, identified in method calls
|
||||
* by "offset" values in the range 0..(@ngpio - 1). When those signals
|
||||
* are referenced through calls like gpio_get_value(gpio), the offset
|
||||
* is calculated by subtracting @base from the gpio number.
|
||||
*/
|
||||
struct gpio_chip {
|
||||
const char *label;
|
||||
struct device *dev;
|
||||
struct module *owner;
|
||||
struct list_head list;
|
||||
|
||||
int (*request)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
void (*free)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
int (*get_direction)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
int (*direction_input)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
int (*get)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
int (*direction_output)(struct gpio_chip *chip,
|
||||
unsigned offset, int value);
|
||||
int (*set_debounce)(struct gpio_chip *chip,
|
||||
unsigned offset, unsigned debounce);
|
||||
|
||||
void (*set)(struct gpio_chip *chip,
|
||||
unsigned offset, int value);
|
||||
|
||||
int (*to_irq)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
|
||||
void (*dbg_show)(struct seq_file *s,
|
||||
struct gpio_chip *chip);
|
||||
int base;
|
||||
u16 ngpio;
|
||||
struct gpio_desc *desc;
|
||||
const char *const *names;
|
||||
unsigned can_sleep:1;
|
||||
unsigned exported:1;
|
||||
|
||||
#if defined(CONFIG_OF_GPIO)
|
||||
/*
|
||||
* If CONFIG_OF is enabled, then all GPIO controllers described in the
|
||||
* device tree automatically may have an OF translation
|
||||
*/
|
||||
struct device_node *of_node;
|
||||
int of_gpio_n_cells;
|
||||
int (*of_xlate)(struct gpio_chip *gc,
|
||||
const struct of_phandle_args *gpiospec, u32 *flags);
|
||||
#endif
|
||||
#ifdef CONFIG_PINCTRL
|
||||
/*
|
||||
* If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
|
||||
* describe the actual pin range which they serve in an SoC. This
|
||||
* information would be used by pinctrl subsystem to configure
|
||||
* corresponding pins for gpio usage.
|
||||
*/
|
||||
struct list_head pin_ranges;
|
||||
#endif
|
||||
};
|
||||
|
||||
extern const char *gpiochip_is_requested(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
extern struct gpio_chip *gpio_to_chip(unsigned gpio);
|
||||
|
||||
/* add/remove chips */
|
||||
extern int gpiochip_add(struct gpio_chip *chip);
|
||||
extern int __must_check gpiochip_remove(struct gpio_chip *chip);
|
||||
extern struct gpio_chip *gpiochip_find(void *data,
|
||||
int (*match)(struct gpio_chip *chip,
|
||||
void *data));
|
||||
|
||||
/* caller holds gpio_lock *OR* gpio is marked as requested */
|
||||
static inline struct gpio_chip *gpio_to_chip(unsigned gpio)
|
||||
{
|
||||
return gpiod_to_chip(gpio_to_desc(gpio));
|
||||
}
|
||||
|
||||
/* Always use the library code for GPIO management calls,
|
||||
* or when sleeping may be involved.
|
||||
|
|
@ -172,25 +63,52 @@ extern struct gpio_chip *gpiochip_find(void *data,
|
|||
extern int gpio_request(unsigned gpio, const char *label);
|
||||
extern void gpio_free(unsigned gpio);
|
||||
|
||||
extern int gpio_direction_input(unsigned gpio);
|
||||
extern int gpio_direction_output(unsigned gpio, int value);
|
||||
static inline int gpio_direction_input(unsigned gpio)
|
||||
{
|
||||
return gpiod_direction_input(gpio_to_desc(gpio));
|
||||
}
|
||||
static inline int gpio_direction_output(unsigned gpio, int value)
|
||||
{
|
||||
return gpiod_direction_output(gpio_to_desc(gpio), value);
|
||||
}
|
||||
|
||||
extern int gpio_set_debounce(unsigned gpio, unsigned debounce);
|
||||
static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
|
||||
{
|
||||
return gpiod_set_debounce(gpio_to_desc(gpio), debounce);
|
||||
}
|
||||
|
||||
extern int gpio_get_value_cansleep(unsigned gpio);
|
||||
extern void gpio_set_value_cansleep(unsigned gpio, int value);
|
||||
static inline int gpio_get_value_cansleep(unsigned gpio)
|
||||
{
|
||||
return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio));
|
||||
}
|
||||
static inline void gpio_set_value_cansleep(unsigned gpio, int value)
|
||||
{
|
||||
return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value);
|
||||
}
|
||||
|
||||
|
||||
/* A platform's <asm/gpio.h> code may want to inline the I/O calls when
|
||||
* the GPIO is constant and refers to some always-present controller,
|
||||
* giving direct access to chip registers and tight bitbanging loops.
|
||||
*/
|
||||
extern int __gpio_get_value(unsigned gpio);
|
||||
extern void __gpio_set_value(unsigned gpio, int value);
|
||||
static inline int __gpio_get_value(unsigned gpio)
|
||||
{
|
||||
return gpiod_get_raw_value(gpio_to_desc(gpio));
|
||||
}
|
||||
static inline void __gpio_set_value(unsigned gpio, int value)
|
||||
{
|
||||
return gpiod_set_raw_value(gpio_to_desc(gpio), value);
|
||||
}
|
||||
|
||||
extern int __gpio_cansleep(unsigned gpio);
|
||||
static inline int __gpio_cansleep(unsigned gpio)
|
||||
{
|
||||
return gpiod_cansleep(gpio_to_desc(gpio));
|
||||
}
|
||||
|
||||
extern int __gpio_to_irq(unsigned gpio);
|
||||
static inline int __gpio_to_irq(unsigned gpio)
|
||||
{
|
||||
return gpiod_to_irq(gpio_to_desc(gpio));
|
||||
}
|
||||
|
||||
extern int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
|
||||
extern void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);
|
||||
|
|
@ -199,19 +117,30 @@ extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *labe
|
|||
extern int gpio_request_array(const struct gpio *array, size_t num);
|
||||
extern void gpio_free_array(const struct gpio *array, size_t num);
|
||||
|
||||
#ifdef CONFIG_GPIO_SYSFS
|
||||
|
||||
/*
|
||||
* A sysfs interface can be exported by individual drivers if they want,
|
||||
* but more typically is configured entirely from userspace.
|
||||
*/
|
||||
extern int gpio_export(unsigned gpio, bool direction_may_change);
|
||||
extern int gpio_export_link(struct device *dev, const char *name,
|
||||
unsigned gpio);
|
||||
extern int gpio_sysfs_set_active_low(unsigned gpio, int value);
|
||||
extern void gpio_unexport(unsigned gpio);
|
||||
static inline int gpio_export(unsigned gpio, bool direction_may_change)
|
||||
{
|
||||
return gpiod_export(gpio_to_desc(gpio), direction_may_change);
|
||||
}
|
||||
|
||||
#endif /* CONFIG_GPIO_SYSFS */
|
||||
static inline int gpio_export_link(struct device *dev, const char *name,
|
||||
unsigned gpio)
|
||||
{
|
||||
return gpiod_export_link(dev, name, gpio_to_desc(gpio));
|
||||
}
|
||||
|
||||
static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
|
||||
{
|
||||
return gpiod_sysfs_set_active_low(gpio_to_desc(gpio), value);
|
||||
}
|
||||
|
||||
static inline void gpio_unexport(unsigned gpio)
|
||||
{
|
||||
gpiod_unexport(gpio_to_desc(gpio));
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PINCTRL
|
||||
|
||||
|
|
@ -281,31 +210,4 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value)
|
|||
|
||||
#endif /* !CONFIG_GPIOLIB */
|
||||
|
||||
#ifndef CONFIG_GPIO_SYSFS
|
||||
|
||||
struct device;
|
||||
|
||||
/* sysfs support is only available with gpiolib, where it's optional */
|
||||
|
||||
static inline int gpio_export(unsigned gpio, bool direction_may_change)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
static inline int gpio_export_link(struct device *dev, const char *name,
|
||||
unsigned gpio)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
static inline void gpio_unexport(unsigned gpio)
|
||||
{
|
||||
}
|
||||
#endif /* CONFIG_GPIO_SYSFS */
|
||||
|
||||
#endif /* _ASM_GENERIC_GPIO_H */
|
||||
|
|
|
|||
|
|
@ -16,14 +16,17 @@
|
|||
#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
|
||||
#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 */
|
||||
#define GPIOF_OPEN_DRAIN (1 << 2)
|
||||
#define GPIOF_OPEN_DRAIN (1 << 3)
|
||||
|
||||
/* 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_CHANGEABLE (1 << 5)
|
||||
#define GPIOF_EXPORT (1 << 5)
|
||||
#define GPIOF_EXPORT_CHANGEABLE (1 << 6)
|
||||
#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
|
||||
#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
|
||||
|
||||
|
|
|
|||
238
include/linux/gpio/consumer.h
Normal file
238
include/linux/gpio/consumer.h
Normal file
|
|
@ -0,0 +1,238 @@
|
|||
#ifndef __LINUX_GPIO_CONSUMER_H
|
||||
#define __LINUX_GPIO_CONSUMER_H
|
||||
|
||||
#include <linux/err.h>
|
||||
#include <linux/kernel.h>
|
||||
|
||||
#ifdef CONFIG_GPIOLIB
|
||||
|
||||
struct device;
|
||||
struct gpio_chip;
|
||||
|
||||
/**
|
||||
* Opaque descriptor for a GPIO. These are obtained using gpiod_get() and are
|
||||
* preferable to the old integer-based handles.
|
||||
*
|
||||
* Contrary to integers, a pointer to a gpio_desc is guaranteed to be valid
|
||||
* until the GPIO is released.
|
||||
*/
|
||||
struct gpio_desc;
|
||||
|
||||
int gpiod_get_direction(const struct gpio_desc *desc);
|
||||
int gpiod_direction_input(struct gpio_desc *desc);
|
||||
int gpiod_direction_output(struct gpio_desc *desc, int value);
|
||||
|
||||
/* Value get/set from non-sleeping context */
|
||||
int gpiod_get_value(const struct gpio_desc *desc);
|
||||
void gpiod_set_value(struct gpio_desc *desc, int value);
|
||||
int gpiod_get_raw_value(const struct gpio_desc *desc);
|
||||
void gpiod_set_raw_value(struct gpio_desc *desc, int value);
|
||||
|
||||
/* Value get/set from sleeping context */
|
||||
int gpiod_get_value_cansleep(const struct gpio_desc *desc);
|
||||
void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
|
||||
int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc);
|
||||
void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
|
||||
|
||||
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
|
||||
|
||||
int gpiod_is_active_low(const struct gpio_desc *desc);
|
||||
int gpiod_cansleep(const struct gpio_desc *desc);
|
||||
|
||||
int gpiod_to_irq(const struct gpio_desc *desc);
|
||||
|
||||
/* Convert between the old gpio_ and new gpiod_ interfaces */
|
||||
struct gpio_desc *gpio_to_desc(unsigned gpio);
|
||||
int desc_to_gpio(const struct gpio_desc *desc);
|
||||
struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
|
||||
|
||||
#else /* CONFIG_GPIOLIB */
|
||||
|
||||
static inline struct gpio_desc *__must_check gpiod_get(struct device *dev,
|
||||
const char *con_id)
|
||||
{
|
||||
return ERR_PTR(-ENOSYS);
|
||||
}
|
||||
static inline struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
|
||||
const char *con_id,
|
||||
unsigned int idx)
|
||||
{
|
||||
return ERR_PTR(-ENOSYS);
|
||||
}
|
||||
static inline void gpiod_put(struct gpio_desc *desc)
|
||||
{
|
||||
might_sleep();
|
||||
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
}
|
||||
|
||||
static inline struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
|
||||
const char *con_id)
|
||||
{
|
||||
return ERR_PTR(-ENOSYS);
|
||||
}
|
||||
static inline
|
||||
struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
|
||||
const char *con_id,
|
||||
unsigned int idx)
|
||||
{
|
||||
return ERR_PTR(-ENOSYS);
|
||||
}
|
||||
static inline void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
|
||||
{
|
||||
might_sleep();
|
||||
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
}
|
||||
|
||||
|
||||
static inline int gpiod_get_direction(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return -ENOSYS;
|
||||
}
|
||||
static inline int gpiod_direction_input(struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return -ENOSYS;
|
||||
}
|
||||
static inline int gpiod_direction_output(struct gpio_desc *desc, int value)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
|
||||
static inline int gpiod_get_value(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return 0;
|
||||
}
|
||||
static inline void gpiod_set_value(struct gpio_desc *desc, int value)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
}
|
||||
static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return 0;
|
||||
}
|
||||
static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
}
|
||||
|
||||
static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return 0;
|
||||
}
|
||||
static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
}
|
||||
static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return 0;
|
||||
}
|
||||
static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
|
||||
int value)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
}
|
||||
|
||||
static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
static inline int gpiod_is_active_low(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return 0;
|
||||
}
|
||||
static inline int gpiod_cansleep(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int gpiod_to_irq(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
|
||||
{
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
static inline int desc_to_gpio(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return -EINVAL;
|
||||
}
|
||||
static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
|
||||
{
|
||||
/* GPIO can never have been requested */
|
||||
WARN_ON(1);
|
||||
return ERR_PTR(-ENODEV);
|
||||
}
|
||||
|
||||
|
||||
#endif /* CONFIG_GPIOLIB */
|
||||
|
||||
#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
|
||||
|
||||
int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
|
||||
int gpiod_export_link(struct device *dev, const char *name,
|
||||
struct gpio_desc *desc);
|
||||
int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value);
|
||||
void gpiod_unexport(struct gpio_desc *desc);
|
||||
|
||||
#else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
|
||||
|
||||
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_GPIOLIB && CONFIG_GPIO_SYSFS */
|
||||
|
||||
#endif
|
||||
127
include/linux/gpio/driver.h
Normal file
127
include/linux/gpio/driver.h
Normal file
|
|
@ -0,0 +1,127 @@
|
|||
#ifndef __LINUX_GPIO_DRIVER_H
|
||||
#define __LINUX_GPIO_DRIVER_H
|
||||
|
||||
#include <linux/types.h>
|
||||
|
||||
struct device;
|
||||
struct gpio_desc;
|
||||
|
||||
/**
|
||||
* struct gpio_chip - abstract a GPIO controller
|
||||
* @label: for diagnostics
|
||||
* @dev: optional device providing the GPIOs
|
||||
* @owner: helps prevent removal of modules exporting active GPIOs
|
||||
* @list: links gpio_chips together for traversal
|
||||
* @request: optional hook for chip-specific activation, such as
|
||||
* enabling module power and clock; may sleep
|
||||
* @free: optional hook for chip-specific deactivation, such as
|
||||
* disabling module power and clock; may sleep
|
||||
* @get_direction: returns direction for signal "offset", 0=out, 1=in,
|
||||
* (same as GPIOF_DIR_XXX), or negative error
|
||||
* @direction_input: configures signal "offset" as input, or returns error
|
||||
* @direction_output: configures signal "offset" as output, or returns error
|
||||
* @get: returns value for signal "offset"; for output signals this
|
||||
* returns either the value actually sensed, or zero
|
||||
* @set: assigns output value for signal "offset"
|
||||
* @set_debounce: optional hook for setting debounce time for specified gpio in
|
||||
* interrupt triggered gpio chips
|
||||
* @to_irq: optional hook supporting non-static gpio_to_irq() mappings;
|
||||
* implementation may not sleep
|
||||
* @dbg_show: optional routine to show contents in debugfs; default code
|
||||
* will be used when this is omitted, but custom code can show extra
|
||||
* state (such as pullup/pulldown configuration).
|
||||
* @base: identifies the first GPIO number handled by this chip; or, if
|
||||
* negative during registration, requests dynamic ID allocation.
|
||||
* @ngpio: the number of GPIOs handled by this controller; the last GPIO
|
||||
* handled is (base + ngpio - 1).
|
||||
* @desc: array of ngpio descriptors. Private.
|
||||
* @can_sleep: flag must be set iff get()/set() methods sleep, as they
|
||||
* must while accessing GPIO expander chips over I2C or SPI
|
||||
* @names: if set, must be an array of strings to use as alternative
|
||||
* names for the GPIOs in this chip. Any entry in the array
|
||||
* may be NULL if there is no alias for the GPIO, however the
|
||||
* array must be @ngpio entries long. A name can include a single printk
|
||||
* format specifier for an unsigned int. It is substituted by the actual
|
||||
* number of the gpio.
|
||||
*
|
||||
* A gpio_chip can help platforms abstract various sources of GPIOs so
|
||||
* they can all be accessed through a common programing interface.
|
||||
* Example sources would be SOC controllers, FPGAs, multifunction
|
||||
* chips, dedicated GPIO expanders, and so on.
|
||||
*
|
||||
* Each chip controls a number of signals, identified in method calls
|
||||
* by "offset" values in the range 0..(@ngpio - 1). When those signals
|
||||
* are referenced through calls like gpio_get_value(gpio), the offset
|
||||
* is calculated by subtracting @base from the gpio number.
|
||||
*/
|
||||
struct gpio_chip {
|
||||
const char *label;
|
||||
struct device *dev;
|
||||
struct module *owner;
|
||||
struct list_head list;
|
||||
|
||||
int (*request)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
void (*free)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
int (*get_direction)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
int (*direction_input)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
int (*direction_output)(struct gpio_chip *chip,
|
||||
unsigned offset, int value);
|
||||
int (*get)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
void (*set)(struct gpio_chip *chip,
|
||||
unsigned offset, int value);
|
||||
int (*set_debounce)(struct gpio_chip *chip,
|
||||
unsigned offset,
|
||||
unsigned debounce);
|
||||
|
||||
int (*to_irq)(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
|
||||
void (*dbg_show)(struct seq_file *s,
|
||||
struct gpio_chip *chip);
|
||||
int base;
|
||||
u16 ngpio;
|
||||
struct gpio_desc *desc;
|
||||
const char *const *names;
|
||||
unsigned can_sleep:1;
|
||||
unsigned exported:1;
|
||||
|
||||
#if defined(CONFIG_OF_GPIO)
|
||||
/*
|
||||
* If CONFIG_OF is enabled, then all GPIO controllers described in the
|
||||
* device tree automatically may have an OF translation
|
||||
*/
|
||||
struct device_node *of_node;
|
||||
int of_gpio_n_cells;
|
||||
int (*of_xlate)(struct gpio_chip *gc,
|
||||
const struct of_phandle_args *gpiospec, u32 *flags);
|
||||
#endif
|
||||
#ifdef CONFIG_PINCTRL
|
||||
/*
|
||||
* If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
|
||||
* describe the actual pin range which they serve in an SoC. This
|
||||
* information would be used by pinctrl subsystem to configure
|
||||
* corresponding pins for gpio usage.
|
||||
*/
|
||||
struct list_head pin_ranges;
|
||||
#endif
|
||||
};
|
||||
|
||||
extern const char *gpiochip_is_requested(struct gpio_chip *chip,
|
||||
unsigned offset);
|
||||
|
||||
/* add/remove chips */
|
||||
extern int gpiochip_add(struct gpio_chip *chip);
|
||||
extern int __must_check gpiochip_remove(struct gpio_chip *chip);
|
||||
extern struct gpio_chip *gpiochip_find(void *data,
|
||||
int (*match)(struct gpio_chip *chip, void *data));
|
||||
|
||||
/* lock/unlock as IRQ */
|
||||
int gpiod_lock_as_irq(struct gpio_desc *desc);
|
||||
void gpiod_unlock_as_irq(struct gpio_desc *desc);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue