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gpiolib: Introduce gpiod_set_config()
The GPIO Aggregator will need a method to forward a .set_config() call to its parent gpiochip. This requires obtaining the gpio_chip and offset for a given gpio_desc. While gpiod_to_chip() is public, gpio_chip_hwgpio() is not, so there is currently no method to obtain the needed GPIO offset parameter. Hence introduce a public gpiod_set_config() helper, which invokes the .set_config() callback through a gpio_desc pointer, like is done for most other gpio_chip callbacks. Rewrite the existing gpiod_set_debounce() helper as a wrapper around gpiod_set_config(), to avoid duplication. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/20200324135653.6676-5-geert+renesas@glider.be Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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2 changed files with 30 additions and 6 deletions
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@ -3431,6 +3431,26 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
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}
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EXPORT_SYMBOL_GPL(gpiod_direction_output);
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/**
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* gpiod_set_config - sets @config for a GPIO
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* @desc: descriptor of the GPIO for which to set the configuration
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* @config: Same packed config format as generic pinconf
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*
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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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* configuration.
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*/
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int gpiod_set_config(struct gpio_desc *desc, unsigned long config)
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{
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struct gpio_chip *chip;
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VALIDATE_DESC(desc);
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chip = desc->gdev->chip;
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return gpio_do_set_config(chip, gpio_chip_hwgpio(desc), config);
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}
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EXPORT_SYMBOL_GPL(gpiod_set_config);
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/**
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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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@ -3442,14 +3462,10 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output);
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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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struct gpio_chip *chip;
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unsigned long config;
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VALIDATE_DESC(desc);
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chip = desc->gdev->chip;
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unsigned long config;
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config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce);
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return gpio_do_set_config(chip, gpio_chip_hwgpio(desc), config);
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return gpiod_set_config(desc, config);
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}
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EXPORT_SYMBOL_GPL(gpiod_set_debounce);
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@ -157,6 +157,7 @@ int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
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struct gpio_array *array_info,
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unsigned long *value_bitmap);
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int gpiod_set_config(struct gpio_desc *desc, unsigned long config);
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int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
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int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
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void gpiod_toggle_active_low(struct gpio_desc *desc);
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@ -473,6 +474,13 @@ static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
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return 0;
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}
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static inline int gpiod_set_config(struct gpio_desc *desc, unsigned long config)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return -ENOSYS;
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}
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static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
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{
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/* GPIO can never have been requested */
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