@@ -136,8 +136,12 @@ 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.
*/
@@ -207,6 +211,9 @@ 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)
@@ -859,7 +866,9 @@ 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
@@ -910,6 +919,8 @@ 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.
*/
@@ -1023,7 +1034,8 @@ 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 *name, int index,
bool *wake_capable)
@@ -1406,7 +1418,7 @@ 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.
*/
@@ -2710,7 +2710,9 @@ 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)
{
@@ -2776,7 +2778,9 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file)
* 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)
{
@@ -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,
@@ -337,6 +371,9 @@ static void devm_gpio_release(struct device *dev, void *res)
* same arguments and performs the same function as
* gpio_request(). GPIOs requested with this function will be
* automatically freed on driver detach.
+ *
+ * Returns:
+ * 0 on success, or negative errno on failure.
*/
int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
{
@@ -366,6 +403,9 @@ EXPORT_SYMBOL_GPL(devm_gpio_request);
* @gpio: the GPIO number
* @flags: GPIO configuration as specified by GPIOF_*
* @label: a literal description string of this GPIO
+ *
+ * Returns:
+ * 0 on success, or negative errno on failure.
*/
int devm_gpio_request_one(struct device *dev, unsigned gpio,
unsigned long flags, const char *label)
@@ -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)
{
@@ -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)
@@ -365,7 +373,8 @@ 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.
*/
@@ -417,7 +426,8 @@ static struct gpio_desc *of_get_named_gpiod_flags(const struct device_node *np,
*
* **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,
@@ -712,7 +722,8 @@ 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,
@@ -780,7 +791,8 @@ 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)
{
@@ -814,7 +826,9 @@ 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)
{
@@ -927,6 +941,9 @@ 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,
@@ -976,6 +993,9 @@ 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,
@@ -96,8 +96,8 @@ struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode,
* system-global GPIOs
* @con_id: function within the GPIO consumer
*
- * Return:
- * The number of GPIOs associated with a device / function or %-ENOENT,
+ * Returns:
+ * The number of GPIOs associated with a device / function or -ENOENT,
* if no GPIO has been assigned to the requested function.
*/
int swnode_gpio_count(const struct fwnode_handle *fwnode, const char *con_id)
@@ -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)
@@ -213,6 +213,9 @@ 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)
{
@@ -325,7 +328,8 @@ 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.
*/
@@ -382,8 +386,8 @@ 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)
{
@@ -1503,6 +1507,9 @@ 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)
@@ -1647,6 +1654,9 @@ 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)
@@ -1881,6 +1891,9 @@ 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 error-code on failure.
*/
static int gpiochip_add_irqchip(struct gpio_chip *gc,
struct lock_class_key *lock_key,
@@ -2016,6 +2029,9 @@ 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)
@@ -2052,6 +2068,9 @@ 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)
{
@@ -2085,6 +2104,9 @@ 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)
@@ -2111,6 +2133,9 @@ 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,
@@ -2162,13 +2187,13 @@ 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 error-code on failure.
*/
int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
unsigned int gpio_offset, unsigned int pin_offset,
@@ -2572,7 +2597,8 @@ 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)
{
@@ -2588,7 +2614,8 @@ 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)
{
@@ -2695,7 +2722,8 @@ 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)
{
@@ -2714,7 +2742,8 @@ 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)
{
@@ -2787,7 +2816,8 @@ 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)
{
@@ -2819,7 +2849,8 @@ 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)
{
@@ -2911,7 +2942,8 @@ 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)
{
@@ -3126,7 +3158,8 @@ 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
@@ -3145,7 +3178,8 @@ 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
@@ -3178,11 +3212,13 @@ 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,
@@ -3205,10 +3241,13 @@ 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,
@@ -3496,6 +3535,9 @@ 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,
@@ -3521,6 +3563,9 @@ 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,
@@ -3539,6 +3584,8 @@ 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)
{
@@ -3551,6 +3598,9 @@ 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)
{
@@ -3564,8 +3614,8 @@ 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)
{
@@ -3619,6 +3669,9 @@ 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)
{
@@ -3770,7 +3823,8 @@ 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.
@@ -3787,7 +3841,8 @@ 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.
@@ -3817,10 +3872,12 @@ 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,
@@ -3844,9 +3901,12 @@ 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,
@@ -3909,6 +3969,9 @@ 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,
@@ -3951,6 +4014,9 @@ 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,
@@ -4284,9 +4350,12 @@ 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)
{
@@ -4313,7 +4382,8 @@ 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.
*/
@@ -4333,6 +4403,11 @@ 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,
@@ -4351,7 +4426,8 @@ 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.
*/
@@ -4426,7 +4502,8 @@ 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.
*/
@@ -4454,6 +4531,11 @@ 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,
@@ -4477,6 +4559,9 @@ 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)
@@ -4533,9 +4618,11 @@ 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,
@@ -4661,6 +4748,12 @@ 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,
$ 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 <andriy.shevchenko@linux.intel.com> --- drivers/gpio/gpiolib-acpi.c | 22 +++-- drivers/gpio/gpiolib-cdev.c | 8 +- drivers/gpio/gpiolib-devres.c | 44 +++++++++- drivers/gpio/gpiolib-legacy.c | 3 + drivers/gpio/gpiolib-of.c | 48 ++++++++--- drivers/gpio/gpiolib-swnode.c | 4 +- drivers/gpio/gpiolib-sysfs.c | 6 +- drivers/gpio/gpiolib.c | 157 +++++++++++++++++++++++++++------- 8 files changed, 233 insertions(+), 59 deletions(-)