diff options
| author |   Alexandre Courbot <acourbot@nvidia.com> | 2014-02-09 17:43:54 +0900 |
|---|---|---|
| committer |   Linus Walleij <linus.walleij@linaro.org> | 2014-02-12 17:11:35 +0100 |
| commit | bb1e88ccb771492ac908ac295ec135efa1d53093 (patch) | |
| tree | b8848e3943167f59db95516a0626020f4efbbe71 /include/linux/gpio/driver.h | |
| parent | GPIO: gpiolib: correct description of gpiod_direction_output (diff) | |
| download | linux-dev-bb1e88ccb771492ac908ac295ec135efa1d53093.tar.xz linux-dev-bb1e88ccb771492ac908ac295ec135efa1d53093.zip | |
gpiolib: add gpiochip_get_desc() driver function
Some drivers dealing with a gpio_chip might need to act on its
descriptors directly; one example is pinctrl drivers that need to lock a
GPIO for being used as IRQ using gpiod_lock_as_irq().
This patch exports a gpiochip_get_desc() function that returns the
GPIO descriptor at the requested index. It also sweeps the
gpio_to_chip() function out of the consumer interface since any holder
of a gpio_chip reference can manipulate its GPIOs way beyond what a
consumer should be allowed to do.
As a result, gpio_chip is not visible anymore to simple GPIO consumers.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/gpio/driver.h')
| -rw-r--r-- | include/linux/gpio/driver.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index a3e181e09636..9fe283642253 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -10,6 +10,8 @@ struct of_phandle_args; struct device_node; struct seq_file; +#ifdef CONFIG_GPIOLIB + /** * struct gpio_chip - abstract a GPIO controller * @label: for diagnostics @@ -129,6 +131,11 @@ extern struct gpio_chip *gpiochip_find(void *data, int gpiod_lock_as_irq(struct gpio_desc *desc); void gpiod_unlock_as_irq(struct gpio_desc *desc); +struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc); + +struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, + u16 hwnum); + enum gpio_lookup_flags { GPIO_ACTIVE_HIGH = (0 << 0), GPIO_ACTIVE_LOW = (1 << 0), @@ -183,4 +190,15 @@ struct gpiod_lookup_table { void gpiod_add_lookup_table(struct gpiod_lookup_table *table); +#else /* CONFIG_GPIOLIB */ + +static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) +{ + /* GPIO can never have been requested */ + WARN_ON(1); + return ERR_PTR(-ENODEV); +} + +#endif /* CONFIG_GPIOLIB */ + #endif |