diff options
| author |   David Brownell <dbrownell@users.sourceforge.net> | 2008-10-15 22:03:14 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-16 11:21:40 -0700 |
| commit | 0f6d504e73b49374c6093efe6aa60ab55058248a (patch) | |
| tree | 414c9e591ba23b2126bc9cad4e0efb1b60693b2d /drivers/gpio | |
| parent | gpio: i2c expanders use subsys_init (diff) | |
| download | linux-dev-0f6d504e73b49374c6093efe6aa60ab55058248a.tar.xz linux-dev-0f6d504e73b49374c6093efe6aa60ab55058248a.zip | |
gpiolib: gpio_to_irq() hooks
Add a new gpiolib mechanism: gpio_chip instances can provide mappings
between their (input) GPIOs and any associated IRQs. This makes it easier
for platforms to support IRQs that are provided by board-specific external
chips instead of as part of their core (such as SOC-integrated GPIOs).
Also update the irq_to_gpio() description, saying to avoid it because it's
not always supported.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 317004fd94fb..29a7e6b1be5d 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1010,6 +1010,24 @@ int __gpio_cansleep(unsigned gpio) } EXPORT_SYMBOL_GPL(__gpio_cansleep); +/** + * __gpio_to_irq() - return the IRQ corresponding to a GPIO + * @gpio: gpio whose IRQ will be returned (already requested) + * Context: any + * + * This is used directly or indirectly to implement gpio_to_irq(). + * It returns the number of the IRQ signaled by this (input) GPIO, + * or a negative errno. + */ +int __gpio_to_irq(unsigned gpio) +{ + struct gpio_chip *chip; + + chip = gpio_to_chip(gpio); + return chip->to_irq ? chip->to_irq(chip, gpio - chip->base) : -ENXIO; +} +EXPORT_SYMBOL_GPL(__gpio_to_irq); + /* There's no value in making it easy to inline GPIO calls that may sleep. |