From 94bd9ce16063a264c85f3b5907fefd8ec979d214 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 28 Aug 2024 19:41:35 +0300 Subject: [PATCH] gpiolib: Update the kernel documentation - add Return sections $ scripts/kernel-doc -v -none -Wall drivers/gpio/gpiolib* 2>&1 | grep -w warning | wc -l 67 Fix these by adding Return sections. While at it, make sure all of Return sections use the same style. Signed-off-by: Andy Shevchenko Reviewed-by: Randy Dunlap Tested-by: Randy Dunlap Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20240828164449.2777666-1-andriy.shevchenko@linux.intel.com Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpiolib-acpi.c | 22 +++-- drivers/gpio/gpiolib-cdev.c | 8 +- drivers/gpio/gpiolib-devres.c | 38 +++++++- drivers/gpio/gpiolib-legacy.c | 3 + drivers/gpio/gpiolib-of.c | 48 ++++++++--- drivers/gpio/gpiolib-swnode.c | 2 +- drivers/gpio/gpiolib-sysfs.c | 6 +- drivers/gpio/gpiolib.c | 157 +++++++++++++++++++++++++++------- 8 files changed, 226 insertions(+), 58 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index cf4b1f068bac..78ecd56123a3 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -153,8 +153,12 @@ static int acpi_gpiochip_find(struct gpio_chip *gc, const void *data) * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") * @pin: ACPI GPIO pin number (0-based, controller-relative) * - * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR - * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO + * Returns: + * GPIO descriptor to use with Linux generic GPIO API. + * If the GPIO cannot be translated or there is an error an ERR_PTR is + * returned. + * + * Specifically returns %-EPROBE_DEFER if the referenced GPIO * controller does not have GPIO chip registered at the moment. This is to * support probe deferral. */ @@ -224,6 +228,9 @@ EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource); * I/O resource or return False if not. * @ares: Pointer to the ACPI resource to fetch * @agpio: Pointer to a &struct acpi_resource_gpio to store the output pointer + * + * Returns: + * %true if GpioIo resource is found, %false otherwise. */ bool acpi_gpio_get_io_resource(struct acpi_resource *ares, struct acpi_resource_gpio **agpio) @@ -876,7 +883,9 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, * that case @index is used to select the GPIO entry in the property value * (in case of multiple). * - * If the GPIO cannot be translated or there is an error, an ERR_PTR is + * Returns: + * GPIO descriptor to use with Linux generic GPIO API. + * If the GPIO cannot be translated or there is an error an ERR_PTR is * returned. * * Note: if the GPIO resource has multiple entries in the pin list, this @@ -924,6 +933,8 @@ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, * resource with the relevant information from a data-only ACPI firmware node * and uses that to obtain the GPIO descriptor to return. * + * Returns: + * GPIO descriptor to use with Linux generic GPIO API. * If the GPIO cannot be translated or there is an error an ERR_PTR is * returned. */ @@ -1042,7 +1053,8 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, * The GPIO is considered wake capable if the GpioInt resource specifies * SharedAndWake or ExclusiveAndWake. * - * Return: Linux IRQ number (> %0) on success, negative errno on failure. + * Returns: + * Linux IRQ number (> 0) on success, negative errno on failure. */ int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *con_id, int index, bool *wake_capable) @@ -1429,7 +1441,7 @@ static int acpi_find_gpio_count(struct acpi_resource *ares, void *data) * @fwnode: firmware node of the GPIO consumer * @con_id: function within the GPIO consumer * - * Return: + * Returns: * The number of GPIOs associated with a firmware node / function or %-ENOENT, * if no GPIO has been assigned to the requested function. */ diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index ef08b23a56e2..5aac59de0d76 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -2748,7 +2748,9 @@ static ssize_t lineinfo_watch_read(struct file *file, char __user *buf, * gpio_chrdev_open() - open the chardev for ioctl operations * @inode: inode for this chardev * @file: file struct for storing private data - * Returns 0 on success + * + * Returns: + * 0 on success, or negative errno on failure. */ static int gpio_chrdev_open(struct inode *inode, struct file *file) { @@ -2814,7 +2816,9 @@ out_free_cdev: * gpio_chrdev_release() - close chardev after ioctl operations * @inode: inode for this chardev * @file: file struct for storing private data - * Returns 0 on success + * + * Returns: + * 0 on success, or negative errno on failure. */ static int gpio_chrdev_release(struct inode *inode, struct file *file) { diff --git a/drivers/gpio/gpiolib-devres.c b/drivers/gpio/gpiolib-devres.c index 4987e62dcb3d..0fdf1356e717 100644 --- a/drivers/gpio/gpiolib-devres.c +++ b/drivers/gpio/gpiolib-devres.c @@ -52,6 +52,11 @@ static int devm_gpiod_match_array(struct device *dev, void *res, void *data) * Managed gpiod_get(). GPIO descriptors returned from this function are * automatically disposed on driver detach. See gpiod_get() for detailed * information about behavior and return values. + * + * Returns: + * The GPIO descriptor corresponding to the function @con_id of device + * dev, %-ENOENT if no GPIO has been assigned to the requested function, or + * another IS_ERR() code if an error occurred while trying to acquire the GPIO. */ struct gpio_desc *__must_check devm_gpiod_get(struct device *dev, const char *con_id, @@ -70,6 +75,11 @@ EXPORT_SYMBOL_GPL(devm_gpiod_get); * Managed gpiod_get_optional(). GPIO descriptors returned from this function * are automatically disposed on driver detach. See gpiod_get_optional() for * detailed information about behavior and return values. + * + * Returns: + * The GPIO descriptor corresponding to the function @con_id of device + * dev, NULL if no GPIO has been assigned to the requested function, or + * another IS_ERR() code if an error occurred while trying to acquire the GPIO. */ struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev, const char *con_id, @@ -89,6 +99,11 @@ EXPORT_SYMBOL_GPL(devm_gpiod_get_optional); * Managed gpiod_get_index(). GPIO descriptors returned from this function are * automatically disposed on driver detach. See gpiod_get_index() for detailed * information about behavior and return values. + * + * Returns: + * The GPIO descriptor corresponding to the function @con_id of device + * dev, %-ENOENT if no GPIO has been assigned to the requested function, or + * another IS_ERR() code if an error occurred while trying to acquire the GPIO. */ struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev, const char *con_id, @@ -141,8 +156,10 @@ EXPORT_SYMBOL_GPL(devm_gpiod_get_index); * GPIO descriptors returned from this function are automatically disposed on * driver detach. * - * On successful request the GPIO pin is configured in accordance with - * provided @flags. + * Returns: + * The GPIO descriptor corresponding to the function @con_id of device + * dev, %-ENOENT if no GPIO has been assigned to the requested function, or + * another IS_ERR() code if an error occurred while trying to acquire the GPIO. */ struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev, struct fwnode_handle *fwnode, @@ -182,6 +199,11 @@ EXPORT_SYMBOL_GPL(devm_fwnode_gpiod_get_index); * function are automatically disposed on driver detach. See * gpiod_get_index_optional() for detailed information about behavior and * return values. + * + * Returns: + * The GPIO descriptor corresponding to the function @con_id of device + * dev, %NULL if no GPIO has been assigned to the requested function, or + * another IS_ERR() code if an error occurred while trying to acquire the GPIO. */ struct gpio_desc *__must_check devm_gpiod_get_index_optional(struct device *dev, const char *con_id, @@ -207,6 +229,12 @@ EXPORT_SYMBOL_GPL(devm_gpiod_get_index_optional); * Managed gpiod_get_array(). GPIO descriptors returned from this function are * automatically disposed on driver detach. See gpiod_get_array() for detailed * information about behavior and return values. + * + * Returns: + * The GPIO descriptors corresponding to the function @con_id of device + * dev, %-ENOENT if no GPIO has been assigned to the requested function, + * or another IS_ERR() code if an error occurred while trying to acquire + * the GPIOs. */ struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev, const char *con_id, @@ -243,6 +271,12 @@ EXPORT_SYMBOL_GPL(devm_gpiod_get_array); * function are automatically disposed on driver detach. * See gpiod_get_array_optional() for detailed information about behavior and * return values. + * + * Returns: + * The GPIO descriptors corresponding to the function @con_id of device + * dev, %NULL if no GPIO has been assigned to the requested function, + * or another IS_ERR() code if an error occurred while trying to acquire + * the GPIOs. */ struct gpio_descs *__must_check devm_gpiod_get_array_optional(struct device *dev, const char *con_id, diff --git a/drivers/gpio/gpiolib-legacy.c b/drivers/gpio/gpiolib-legacy.c index f421208ddbdd..087fe3227e35 100644 --- a/drivers/gpio/gpiolib-legacy.c +++ b/drivers/gpio/gpiolib-legacy.c @@ -22,6 +22,9 @@ EXPORT_SYMBOL_GPL(gpio_free); * @label: a literal description string of this GPIO * * **DEPRECATED** This function is deprecated and must not be used in new code. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) { diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index d0d78e0fa28c..880f1efcaca5 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -46,16 +46,19 @@ enum of_gpio_flags { * @propname: property name containing gpio specifier(s) * * The function returns the count of GPIOs specified for a node. - * Note that the empty GPIO specifiers count too. Returns either - * Number of gpios defined in property, - * -EINVAL for an incorrectly formed gpios property, or - * -ENOENT for a missing gpios property + * NOTE: The empty GPIO specifiers count too. * - * Example: - * gpios = <0 - * &gpio1 1 2 - * 0 - * &gpio2 3 4>; + * Returns: + * Either number of GPIOs defined in the property, or + * * %-EINVAL for an incorrectly formed "gpios" property, or + * * %-ENOENT for a missing "gpios" property. + * + * Example:: + * + * gpios = <0 + * &gpio1 1 2 + * 0 + * &gpio2 3 4>; * * The above example defines four GPIOs, two of which are not specified. * This function will return '4' @@ -77,6 +80,11 @@ static int of_gpio_named_count(const struct device_node *np, * "gpios" for the chip select lines. If we detect this, we redirect * the counting of "cs-gpios" to count "gpios" transparent to the * driver. + * + * Returns: + * Either number of GPIOs defined in the property, or + * * %-EINVAL for an incorrectly formed "gpios" property, or + * * %-ENOENT for a missing "gpios" property. */ static int of_gpio_spi_cs_get_count(const struct device_node *np, const char *con_id) @@ -373,7 +381,8 @@ static void of_gpio_flags_quirks(const struct device_node *np, * @index: index of the GPIO * @flags: a flags pointer to fill in * - * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno + * Returns: + * GPIO descriptor to use with Linux GPIO API, or one of the errno * value on the error condition. If @flags is not NULL the function also fills * in flags for the GPIO. */ @@ -425,7 +434,8 @@ out: * * **DEPRECATED** This function is deprecated and must not be used in new code. * - * Returns GPIO number to use with Linux generic GPIO API, or one of the errno + * Returns: + * GPIO number to use with Linux generic GPIO API, or one of the errno * value on the error condition. */ int of_get_named_gpio(const struct device_node *np, const char *propname, @@ -711,7 +721,8 @@ struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, * of_find_gpio() or of_parse_own_gpio() * @dflags: gpiod_flags - optional GPIO initialization flags * - * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno + * Returns: + * GPIO descriptor to use with Linux GPIO API, or one of the errno * value on the error condition. */ static struct gpio_desc *of_parse_own_gpio(struct device_node *np, @@ -779,7 +790,8 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np, * @chip: gpio chip to act on * @hog: device node describing the hogs * - * Returns error if it fails otherwise 0 on success. + * Returns: + * 0 on success, or negative errno on failure. */ static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) { @@ -813,7 +825,9 @@ static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) * * This is only used by of_gpiochip_add to request/set GPIO initial * configuration. - * It returns error if it fails otherwise 0 on success. + * + * Returns: + * 0 on success, or negative errno on failure. */ static int of_gpiochip_scan_gpios(struct gpio_chip *chip) { @@ -923,6 +937,9 @@ struct notifier_block gpio_of_notifier = { * This is simple translation function, suitable for the most 1:1 mapped * GPIO chips. This function performs only one sanity check: whether GPIO * is less than ngpios (that is specified in the gpio_chip). + * + * Returns: + * GPIO number (>= 0) on success, negative errno on failure. */ static int of_gpio_simple_xlate(struct gpio_chip *gc, const struct of_phandle_args *gpiospec, @@ -972,6 +989,9 @@ static int of_gpio_simple_xlate(struct gpio_chip *gc, * If succeeded, this function will map bank's memory and will * do all necessary work for you. Then you'll able to use .regs * to manage GPIOs from the callbacks. + * + * Returns: + * 0 on success, or negative errno on failure. */ int of_mm_gpiochip_add_data(struct device_node *np, struct of_mm_gpio_chip *mm_gc, diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-swnode.c index 1a6f70671816..2b2dd7e92211 100644 --- a/drivers/gpio/gpiolib-swnode.c +++ b/drivers/gpio/gpiolib-swnode.c @@ -106,7 +106,7 @@ struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode, * system-global GPIOs * @con_id: function within the GPIO consumer * - * Return: + * Returns: * The number of GPIOs associated with a device / function or %-ENOENT, * if no GPIO has been assigned to the requested function. */ diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index 26202586fd39..17ed229412af 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -568,7 +568,8 @@ static struct class gpio_class = { * will see "direction" sysfs attribute which may be used to change * the gpio's direction. A "value" attribute will always be provided. * - * Returns zero on success, else an error. + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_export(struct gpio_desc *desc, bool direction_may_change) { @@ -667,7 +668,8 @@ static int match_export(struct device *dev, const void *desc) * Set up a symlink from /sys/.../dev/name to /sys/class/gpio/gpioN * node. Caller is responsible for unlinking. * - * Returns zero on success, else an error. + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_export_link(struct device *dev, const char *name, struct gpio_desc *desc) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index de425db71111..c6afbf434366 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -230,6 +230,9 @@ EXPORT_SYMBOL_GPL(desc_to_gpio); * This function is unsafe and should not be used. Using the chip address * without taking the SRCU read lock may result in dereferencing a dangling * pointer. + * + * Returns: + * Address of the GPIO chip backing this device. */ struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) { @@ -342,7 +345,8 @@ static int gpiochip_find_base_unlocked(u16 ngpio) * gpiod_get_direction - return the current direction of a GPIO * @desc: GPIO to get the direction of * - * Returns 0 for output, 1 for input, or an error code in case of error. + * Returns: + * 0 for output, 1 for input, or an error code in case of error. * * This function may sleep if gpiod_cansleep() is true. */ @@ -399,8 +403,8 @@ EXPORT_SYMBOL_GPL(gpiod_get_direction); * Add a new chip to the global chips list, keeping the list of chips sorted * by range(means [base, base + ngpio - 1]) order. * - * Return -EBUSY if the new chip overlaps with some other chip's integer - * space. + * Returns: + * -EBUSY if the new chip overlaps with some other chip's integer space. */ static int gpiodev_add_to_list_unlocked(struct gpio_device *gdev) { @@ -1516,6 +1520,9 @@ static unsigned int gpiochip_child_offset_to_irq_noop(struct gpio_chip *gc, * This function is a wrapper that calls gpiochip_lock_as_irq() and is to be * used as the activate function for the &struct irq_domain_ops. The host_data * for the IRQ domain must be the &struct gpio_chip. + * + * Returns: + * 0 on success, or negative errno on failure. */ static int gpiochip_irq_domain_activate(struct irq_domain *domain, struct irq_data *data, bool reserve) @@ -1660,6 +1667,9 @@ static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc) * This function will set up the mapping for a certain IRQ line on a * gpiochip by assigning the gpiochip as chip data, and using the irqchip * stored inside the gpiochip. + * + * Returns: + * 0 on success, or negative errno on failure. */ static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hwirq) @@ -1894,6 +1904,9 @@ static int gpiochip_irqchip_add_allocated_domain(struct gpio_chip *gc, * @gc: the GPIO chip to add the IRQ chip to * @lock_key: lockdep class for IRQ lock * @request_key: lockdep class for IRQ request + * + * Returns: + * 0 on success, or a negative errno on failure. */ static int gpiochip_add_irqchip(struct gpio_chip *gc, struct lock_class_key *lock_key, @@ -2029,6 +2042,9 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gc) * @domain: the irqdomain to add to the gpiochip * * This function adds an IRQ domain to the gpiochip. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiochip_irqchip_add_domain(struct gpio_chip *gc, struct irq_domain *domain) @@ -2065,6 +2081,9 @@ static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc) * gpiochip_generic_request() - request the gpio function for a pin * @gc: the gpiochip owning the GPIO * @offset: the offset of the GPIO to request for GPIO function + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiochip_generic_request(struct gpio_chip *gc, unsigned int offset) { @@ -2098,6 +2117,9 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_free); * @gc: the gpiochip owning the GPIO * @offset: the offset of the GPIO to apply the configuration * @config: the configuration to be applied + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiochip_generic_config(struct gpio_chip *gc, unsigned int offset, unsigned long config) @@ -2124,6 +2146,9 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_config); * pinctrl driver is DEPRECATED. Please see Section 2.1 of * Documentation/devicetree/bindings/gpio/gpio.txt on how to * bind pinctrl and gpio drivers via the "gpio-ranges" property. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiochip_add_pingroup_range(struct gpio_chip *gc, struct pinctrl_dev *pctldev, @@ -2175,13 +2200,13 @@ EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); * @npins: the number of pins from the offset of each pin space (GPIO and * pin controller) to accumulate in this range * - * Returns: - * 0 on success, or a negative error-code on failure. - * * Calling this function directly from a DeviceTree-supported * pinctrl driver is DEPRECATED. Please see Section 2.1 of * Documentation/devicetree/bindings/gpio/gpio.txt on how to * bind pinctrl and gpio drivers via the "gpio-ranges" property. + * + * Returns: + * 0 on success, or a negative errno on failure. */ int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name, unsigned int gpio_offset, unsigned int pin_offset, @@ -2585,7 +2610,8 @@ static int gpio_set_bias(struct gpio_desc *desc) * The function calls the certain GPIO driver to set debounce timeout * in the hardware. * - * Returns 0 on success, or negative error code otherwise. + * Returns: + * 0 on success, or negative errno on failure. */ int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce) { @@ -2601,7 +2627,8 @@ int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce) * Set the direction of the passed GPIO to input, such as gpiod_get_value() can * be called safely on it. * - * Return 0 in case of success, else an error code. + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_direction_input(struct gpio_desc *desc) { @@ -2708,7 +2735,8 @@ static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) * be called safely on it. The initial value of the output must be specified * as raw value on the physical line without regard for the ACTIVE_LOW status. * - * Return 0 in case of success, else an error code. + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_direction_output_raw(struct gpio_desc *desc, int value) { @@ -2727,7 +2755,8 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into * account. * - * Return 0 in case of success, else an error code. + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_direction_output(struct gpio_desc *desc, int value) { @@ -2800,7 +2829,8 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output); * @desc: GPIO to enable. * @flags: Flags related to GPIO edge. * - * Return 0 in case of success, else negative error code. + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags) { @@ -2832,7 +2862,8 @@ EXPORT_SYMBOL_GPL(gpiod_enable_hw_timestamp_ns); * @desc: GPIO to disable. * @flags: Flags related to GPIO edge, same value as used during enable call. * - * Return 0 in case of success, else negative error code. + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags) { @@ -2924,7 +2955,8 @@ int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) * gpiod_is_active_low - test whether a GPIO is active-low or not * @desc: the gpio descriptor to test * - * Returns 1 if the GPIO is active-low, 0 otherwise. + * Returns: + * 1 if the GPIO is active-low, 0 otherwise. */ int gpiod_is_active_low(const struct gpio_desc *desc) { @@ -3139,7 +3171,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep, * gpiod_get_raw_value() - 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 + * Returns: + * The GPIO's raw value, i.e. the value of the physical line disregarding * its ACTIVE_LOW status, or negative errno on failure. * * This function can be called from contexts where we cannot sleep, and will @@ -3158,7 +3191,8 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_value); * 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 + * Returns: + * The GPIO's logical value, i.e. taking the ACTIVE_LOW status into * account, or negative errno on failure. * * This function can be called from contexts where we cannot sleep, and will @@ -3191,11 +3225,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_value); * @value_bitmap: bitmap to store the read values * * Read the raw values of the GPIOs, i.e. the values of the physical lines - * without regard for their ACTIVE_LOW status. Return 0 in case of success, - * else an error code. + * without regard for their ACTIVE_LOW status. * * This function can be called from contexts where we cannot sleep, * and it will complain if the GPIO chip functions potentially sleep. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_get_raw_array_value(unsigned int array_size, struct gpio_desc **desc_array, @@ -3218,10 +3254,13 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value); * @value_bitmap: bitmap to store the read values * * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status - * into account. Return 0 in case of success, else an error code. + * into account. * * This function can be called from contexts where we cannot sleep, * and it will complain if the GPIO chip functions potentially sleep. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_get_array_value(unsigned int array_size, struct gpio_desc **desc_array, @@ -3509,6 +3548,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value); * * This function can be called from contexts where we cannot sleep, and will * complain if the GPIO chip functions potentially sleep. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_set_raw_array_value(unsigned int array_size, struct gpio_desc **desc_array, @@ -3534,6 +3576,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); * * This function can be called from contexts where we cannot sleep, and will * complain if the GPIO chip functions potentially sleep. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_set_array_value(unsigned int array_size, struct gpio_desc **desc_array, @@ -3552,6 +3597,8 @@ EXPORT_SYMBOL_GPL(gpiod_set_array_value); * gpiod_cansleep() - report whether gpio value access may sleep * @desc: gpio to check * + * Returns: + * 0 for non-sleepable, 1 for sleepable, or an error code in case of error. */ int gpiod_cansleep(const struct gpio_desc *desc) { @@ -3564,6 +3611,9 @@ EXPORT_SYMBOL_GPL(gpiod_cansleep); * gpiod_set_consumer_name() - set the consumer name for the descriptor * @desc: gpio to set the consumer name on * @name: the new consumer name + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name) { @@ -3577,8 +3627,8 @@ EXPORT_SYMBOL_GPL(gpiod_set_consumer_name); * gpiod_to_irq() - return the IRQ corresponding to a GPIO * @desc: gpio whose IRQ will be returned (already requested) * - * Return the IRQ corresponding to the passed GPIO, or an error code in case of - * error. + * Returns: + * The IRQ corresponding to the passed GPIO, or an error code in case of error. */ int gpiod_to_irq(const struct gpio_desc *desc) { @@ -3632,6 +3682,9 @@ EXPORT_SYMBOL_GPL(gpiod_to_irq); * * This is used directly by GPIO drivers that want to lock down * a certain GPIO line to be used for IRQs. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset) { @@ -3783,7 +3836,8 @@ EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); * 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 + * Returns: + * The GPIO's raw value, i.e. the value of the physical line disregarding * its ACTIVE_LOW status, or negative errno on failure. * * This function is to be called from contexts that can sleep. @@ -3800,7 +3854,8 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); * 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 + * Returns: + * The GPIO's logical value, i.e. taking the ACTIVE_LOW status into * account, or negative errno on failure. * * This function is to be called from contexts that can sleep. @@ -3830,10 +3885,12 @@ EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); * @value_bitmap: bitmap to store the read values * * Read the raw values of the GPIOs, i.e. the values of the physical lines - * without regard for their ACTIVE_LOW status. Return 0 in case of success, - * else an error code. + * without regard for their ACTIVE_LOW status. * * This function is to be called from contexts that can sleep. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_get_raw_array_value_cansleep(unsigned int array_size, struct gpio_desc **desc_array, @@ -3857,9 +3914,12 @@ EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep); * @value_bitmap: bitmap to store the read values * * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status - * into account. Return 0 in case of success, else an error code. + * into account. * * This function is to be called from contexts that can sleep. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_get_array_value_cansleep(unsigned int array_size, struct gpio_desc **desc_array, @@ -3922,6 +3982,9 @@ EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); * without regard for their ACTIVE_LOW status. * * This function is to be called from contexts that can sleep. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_set_raw_array_value_cansleep(unsigned int array_size, struct gpio_desc **desc_array, @@ -3964,6 +4027,9 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) * into account. * * This function is to be called from contexts that can sleep. + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_set_array_value_cansleep(unsigned int array_size, struct gpio_desc **desc_array, @@ -4297,9 +4363,12 @@ EXPORT_SYMBOL_GPL(fwnode_gpiod_get_index); /** * gpiod_count - return the number of GPIOs associated with a device / function - * or -ENOENT if no GPIO has been assigned to the requested function * @dev: GPIO consumer, can be NULL for system-global GPIOs * @con_id: function within the GPIO consumer + * + * Returns: + * The number of GPIOs associated with a device / function or -ENOENT if no + * GPIO has been assigned to the requested function. */ int gpiod_count(struct device *dev, const char *con_id) { @@ -4326,7 +4395,8 @@ EXPORT_SYMBOL_GPL(gpiod_count); * @con_id: function within the GPIO consumer * @flags: optional GPIO initialization flags * - * Return the GPIO descriptor corresponding to the function con_id of device + * Returns: + * The GPIO descriptor corresponding to the function @con_id of device * dev, -ENOENT if no GPIO has been assigned to the requested function, or * another IS_ERR() code if an error occurred while trying to acquire the GPIO. */ @@ -4346,6 +4416,11 @@ EXPORT_SYMBOL_GPL(gpiod_get); * This is equivalent to gpiod_get(), except that when no GPIO was assigned to * the requested function it will return NULL. This is convenient for drivers * that need to handle optional GPIOs. + * + * Returns: + * The GPIO descriptor corresponding to the function @con_id of device + * dev, NULL if no GPIO has been assigned to the requested function, or + * another IS_ERR() code if an error occurred while trying to acquire the GPIO. */ struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, const char *con_id, @@ -4364,7 +4439,8 @@ EXPORT_SYMBOL_GPL(gpiod_get_optional); * of_find_gpio() or of_get_gpio_hog() * @dflags: gpiod_flags - optional GPIO initialization flags * - * Return 0 on success, -ENOENT if no GPIO has been assigned to the + * Returns: + * 0 on success, -ENOENT if no GPIO has been assigned to the * requested function and/or index, or another IS_ERR() code if an error * occurred while trying to acquire the GPIO. */ @@ -4439,7 +4515,8 @@ int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, * This variant of gpiod_get() allows to access GPIOs other than the first * defined one for functions that define several GPIOs. * - * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the + * Returns: + * A valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the * requested function and/or index, or another IS_ERR() code if an error * occurred while trying to acquire the GPIO. */ @@ -4467,6 +4544,11 @@ EXPORT_SYMBOL_GPL(gpiod_get_index); * This is equivalent to gpiod_get_index(), except that when no GPIO with the * specified index was assigned to the requested function it will return NULL. * This is convenient for drivers that need to handle optional GPIOs. + * + * Returns: + * A valid GPIO descriptor, NULL if no GPIO has been assigned to the + * requested function and/or index, or another IS_ERR() code if an error + * occurred while trying to acquire the GPIO. */ struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, const char *con_id, @@ -4490,6 +4572,9 @@ EXPORT_SYMBOL_GPL(gpiod_get_index_optional); * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from * of_find_gpio() or of_get_gpio_hog() * @dflags: gpiod_flags - optional GPIO initialization flags + * + * Returns: + * 0 on success, or negative errno on failure. */ int gpiod_hog(struct gpio_desc *desc, const char *name, unsigned long lflags, enum gpiod_flags dflags) @@ -4546,9 +4631,11 @@ static void gpiochip_free_hogs(struct gpio_chip *gc) * * This function acquires all the GPIOs defined under a given function. * - * Return a struct gpio_descs containing an array of descriptors, -ENOENT if - * no GPIO has been assigned to the requested function, or another IS_ERR() - * code if an error occurred while trying to acquire the GPIOs. + * Returns: + * The GPIO descriptors corresponding to the function @con_id of device + * dev, -ENOENT if no GPIO has been assigned to the requested function, + * or another IS_ERR() code if an error occurred while trying to acquire + * the GPIOs. */ struct gpio_descs *__must_check gpiod_get_array(struct device *dev, const char *con_id, @@ -4674,6 +4761,12 @@ EXPORT_SYMBOL_GPL(gpiod_get_array); * * This is equivalent to gpiod_get_array(), except that when no GPIO was * assigned to the requested function it will return NULL. + * + * Returns: + * The GPIO descriptors corresponding to the function @con_id of device + * dev, NULL if no GPIO has been assigned to the requested function, + * or another IS_ERR() code if an error occurred while trying to acquire + * the GPIOs. */ struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, const char *con_id,