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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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-
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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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-
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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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-
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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 @@ fail_unlock:
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status);
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return status;
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}
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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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-
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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 @@ unlock:
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return status;
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}
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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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-
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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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-
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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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-
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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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-
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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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-
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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 @@ fail:
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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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-
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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 @@ fail:
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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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-
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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 @@ fail:
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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);
|
|
|
+ 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);
|
|
|
}
|
|
|
+EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
|
|
|
|
|
|
-void __gpio_set_value(unsigned gpio, int value)
|
|
|
+/**
|
|
|
+ * gpiod_set_value() - assign a gpio's value
|
|
|
+ * @desc: gpio whose value will be assigned
|
|
|
+ * @value: value to assign
|
|
|
+ *
|
|
|
+ * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into
|
|
|
+ * account
|
|
|
+ *
|
|
|
+ * This function should be called from contexts where we cannot sleep, and will
|
|
|
+ * complain if the GPIO chip functions potentially sleep.
|
|
|
+ */
|
|
|
+void gpiod_set_value(struct gpio_desc *desc, int value)
|
|
|
{
|
|
|
- return gpiod_set_value(gpio_to_desc(gpio), value);
|
|
|
+ if (!desc)
|
|
|
+ return;
|
|
|
+ /* Should be using gpio_set_value_cansleep() */
|
|
|
+ WARN_ON(desc->chip->can_sleep);
|
|
|
+ if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
|
|
|
+ value = !value;
|
|
|
+ _gpiod_set_raw_value(desc, value);
|
|
|
}
|
|
|
-EXPORT_SYMBOL_GPL(__gpio_set_value);
|
|
|
+EXPORT_SYMBOL_GPL(gpiod_set_value);
|
|
|
|
|
|
/**
|
|
|
- * __gpio_cansleep() - report whether gpio value access will sleep
|
|
|
- * @gpio: gpio in question
|
|
|
- * Context: any
|
|
|
+ * gpiod_cansleep() - report whether gpio value access may sleep
|
|
|
+ * @desc: gpio to check
|
|
|
*
|
|
|
- * This is used directly or indirectly to implement gpio_cansleep(). It
|
|
|
- * returns nonzero if access reading or writing the GPIO value can sleep.
|
|
|
*/
|
|
|
-static int gpiod_cansleep(const struct gpio_desc *desc)
|
|
|
+int gpiod_cansleep(const struct gpio_desc *desc)
|
|
|
{
|
|
|
if (!desc)
|
|
|
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));
|
|
|
+ int value;
|
|
|
+
|
|
|
+ might_sleep_if(extra_checks);
|
|
|
+ if (!desc)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ value = _gpiod_get_raw_value(desc);
|
|
|
+ if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
|
|
|
+ value = !value;
|
|
|
+
|
|
|
+ return value;
|
|
|
}
|
|
|
-EXPORT_SYMBOL_GPL(gpio_get_value_cansleep);
|
|
|
+EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
|
|
|
|
|
|
-static void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
|
|
|
+/**
|
|
|
+ * gpiod_set_raw_value_cansleep() - assign a gpio's raw value
|
|
|
+ * @desc: gpio whose value will be assigned
|
|
|
+ * @value: value to assign
|
|
|
+ *
|
|
|
+ * Set the raw value of the GPIO, i.e. the value of its physical line without
|
|
|
+ * regard for its ACTIVE_LOW status.
|
|
|
+ *
|
|
|
+ * This function is to be called from contexts that can sleep.
|
|
|
+ */
|
|
|
+void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
|
|
|
{
|
|
|
might_sleep_if(extra_checks);
|
|
|
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
|
|
|
|