mirror of https://gitee.com/openkylin/linux.git
gpio: Cleanup kerneldoc
Some kerneldoc has become stale or wasn't quite correct from the outset. Fix up the most serious issues to silence warnings when building the documentation. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Thierry Reding
Linus Walleij
parent
9c07409c34
commit
950d55f5bf
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@ -84,7 +84,12 @@ static inline void desc_set_label(struct gpio_desc *d, const char *label)
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}
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/**
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* Convert a GPIO number to its descriptor
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* gpio_to_desc - Convert a GPIO number to its descriptor
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* @gpio: global GPIO number
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*
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* Returns:
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* The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO
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* with the given number exists in the system.
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*/
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struct gpio_desc *gpio_to_desc(unsigned gpio)
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{
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@ -111,7 +116,14 @@ struct gpio_desc *gpio_to_desc(unsigned gpio)
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EXPORT_SYMBOL_GPL(gpio_to_desc);
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/**
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* Get the GPIO descriptor corresponding to the given hw number for this chip.
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* gpiochip_get_desc - get the GPIO descriptor corresponding to the given
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* hardware number for this chip
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* @chip: GPIO chip
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* @hwnum: hardware number of the GPIO for this chip
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*
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* Returns:
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* A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists
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* in the given chip for the specified hardware number.
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*/
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struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
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u16 hwnum)
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@ -125,9 +137,14 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
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}
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/**
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* Convert a GPIO descriptor to the integer namespace.
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* desc_to_gpio - convert a GPIO descriptor to the integer namespace
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* @desc: GPIO descriptor
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*
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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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* use GPIO numbers for error messages and sysfs nodes.
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*
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* Returns:
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* The global GPIO number for the GPIO specified by its descriptor.
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*/
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int desc_to_gpio(const struct gpio_desc *desc)
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{
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@ -254,7 +271,7 @@ static int gpiodev_add_to_list(struct gpio_device *gdev)
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return -EBUSY;
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}
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/**
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/*
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* Convert a GPIO name to its descriptor
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*/
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static struct gpio_desc *gpio_name_to_desc(const char * const name)
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@ -878,7 +895,7 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
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return ret;
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}
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/**
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/*
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* gpio_ioctl() - ioctl handler for the GPIO chardev
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*/
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static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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@ -1077,11 +1094,9 @@ static void gpiochip_setup_devs(void)
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/**
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* gpiochip_add_data() - register a gpio_chip
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* @chip: the chip to register, with chip->base initialized
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* Context: potentially before irqs will work
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* @data: driver-private data associated with this chip
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*
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* Returns a negative errno if the chip can't be registered, such as
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* because the chip->base is invalid or already associated with a
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* different chip. Otherwise it returns zero as a success code.
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* Context: potentially before irqs will work
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*
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* When gpiochip_add_data() is called very early during boot, so that GPIOs
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* can be freely used, the chip->parent device must be registered before
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@ -1093,6 +1108,11 @@ static void gpiochip_setup_devs(void)
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*
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* If chip->base is negative, this requests dynamic assignment of
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* a range of valid GPIOs.
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*
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* Returns:
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* A negative errno if the chip can't be registered, such as because the
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* chip->base is invalid or already associated with a different chip.
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* Otherwise it returns zero as a success code.
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*/
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int gpiochip_add_data(struct gpio_chip *chip, void *data)
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{
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@ -1298,6 +1318,10 @@ EXPORT_SYMBOL_GPL(gpiochip_add_data);
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/**
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* gpiochip_get_data() - get per-subdriver data for the chip
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* @chip: GPIO chip
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*
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* Returns:
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* The per-subdriver data for the chip.
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*/
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void *gpiochip_get_data(struct gpio_chip *chip)
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{
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@ -1381,13 +1405,16 @@ static int devm_gpio_chip_match(struct device *dev, void *res, void *data)
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* devm_gpiochip_add_data() - Resource manager piochip_add_data()
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* @dev: the device pointer on which irq_chip belongs to.
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* @chip: the chip to register, with chip->base initialized
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* @data: driver-private data associated with this chip
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*
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* Context: potentially before irqs will work
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*
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* Returns a negative errno if the chip can't be registered, such as
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* because the chip->base is invalid or already associated with a
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* different chip. Otherwise it returns zero as a success code.
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*
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* The gpio chip automatically be released when the device is unbound.
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*
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* Returns:
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* A negative errno if the chip can't be registered, such as because the
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* chip->base is invalid or already associated with a different chip.
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* Otherwise it returns zero as a success code.
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*/
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int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip,
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void *data)
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@ -1433,7 +1460,7 @@ EXPORT_SYMBOL_GPL(devm_gpiochip_remove);
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/**
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* gpiochip_find() - iterator for locating a specific gpio_chip
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* @data: data to pass to match function
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* @callback: Callback function to check gpio_chip
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* @match: Callback function to check gpio_chip
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*
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* Similar to bus_find_device. It returns a reference to a gpio_chip as
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* determined by a user supplied @match callback. The callback should return
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@ -1924,11 +1951,14 @@ EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range);
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/**
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* gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping
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* @chip: the gpiochip to add the range for
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* @pinctrl_name: the dev_name() of the pin controller to map to
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* @pinctl_name: the dev_name() of the pin controller to map to
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* @gpio_offset: the start offset in the current gpio_chip number space
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* @pin_offset: the start offset in the pin controller number space
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* @npins: the number of pins from the offset of each pin space (GPIO and
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* pin controller) to accumulate in this range
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*
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* Returns:
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* 0 on success, or a negative error-code on failure.
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*/
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int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
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unsigned int gpio_offset, unsigned int pin_offset,
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@ -2173,7 +2203,8 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested);
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/**
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* gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor
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* @desc: GPIO descriptor to request
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* @chip: GPIO chip
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* @hwnum: hardware number of the GPIO for which to request the descriptor
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* @label: label for the GPIO
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*
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* Function allows GPIO chip drivers to request and use their own GPIO
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@ -2181,6 +2212,10 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested);
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* function will not increase reference count of the GPIO chip module. This
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* allows the GPIO chip module to be unloaded as needed (we assume that the
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* GPIO chip driver handles freeing the GPIOs it has requested).
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*
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* Returns:
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* A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error
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* code on failure.
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*/
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struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
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const char *label)
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@ -2362,12 +2397,13 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
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EXPORT_SYMBOL_GPL(gpiod_direction_output);
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/**
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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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* gpiod_set_debounce - sets @debounce time for a GPIO
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* @desc: descriptor of the GPIO for which to set debounce time
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* @debounce: debounce time in 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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* Returns:
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* 0 on success, %-ENOTSUPP if the controller doesn't support setting the
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* debounce time.
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*/
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int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
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{
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@ -3316,6 +3352,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_index);
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* @propname: name of the firmware property representing the GPIO
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* @index: index of the GPIO to obtain in the consumer
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* @dflags: GPIO initialization flags
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* @label: label to attach to the requested GPIO
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*
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* This function can be used for drivers that get their configuration
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* from firmware.
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@ -3324,6 +3361,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_index);
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* underlying firmware interface and then makes sure that the GPIO
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* descriptor is requested before it is returned to the caller.
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*
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* Returns:
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* On successful request the GPIO pin is configured in accordance with
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* provided @dflags.
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*
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@ -327,11 +327,10 @@ int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset,
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/**
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* struct gpio_pin_range - pin range controlled by a gpio chip
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* @head: list for maintaining set of pin ranges, used internally
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* @node: list for maintaining set of pin ranges, used internally
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* @pctldev: pinctrl device which handles corresponding pins
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* @range: actual range of pins controlled by a gpio controller
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*/
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struct gpio_pin_range {
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struct list_head node;
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struct pinctrl_dev *pctldev;
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