diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-05-02 15:46:46 +0400 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-05-19 02:48:35 +0400 |
| commit | 09d71ff19404b3957fab6de942fb8026ccfd8524 (patch) | |
| tree | ba3680f5b79ea1fbeae073ab7cb28c9bdcad7e60 /drivers/gpio/devres.c | |
| parent | eb1567f7ad0032ba7b02b878e352f191d53dc228 (diff) | |
| download | linux-09d71ff19404b3957fab6de942fb8026ccfd8524.tar.xz | |
gpiolib: Implement devm_gpio_request_one()
Allow drivers to use the modern request and configure idiom together
with devres.
As with plain gpio_request() and gpio_request_one() we can't implement
the old school version in terms of _one() as this would force the
explicit selection of a direction in gpio_request() which could break
systems if we pick the wrong one. Implementing devm_gpio_request_one()
in terms of devm_gpio_request() would needlessly complicate things or
lead to duplication from the unmanaged version depending on how it's
done.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/gpio/devres.c')
| -rw-r--r-- | drivers/gpio/devres.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/gpio/devres.c b/drivers/gpio/devres.c index 3dd29399cef5..d21a9ff38551 100644 --- a/drivers/gpio/devres.c +++ b/drivers/gpio/devres.c @@ -71,6 +71,35 @@ int devm_gpio_request(struct device *dev, unsigned gpio, const char *label) EXPORT_SYMBOL(devm_gpio_request); /** + * devm_gpio_request_one - request a single GPIO with initial setup + * @dev: device to request for + * @gpio: the GPIO number + * @flags: GPIO configuration as specified by GPIOF_* + * @label: a literal description string of this GPIO + */ +int devm_gpio_request_one(struct device *dev, unsigned gpio, + unsigned long flags, const char *label) +{ + unsigned *dr; + int rc; + + dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL); + if (!dr) + return -ENOMEM; + + rc = gpio_request_one(gpio, flags, label); + if (rc) { + devres_free(dr); + return rc; + } + + *dr = gpio; + devres_add(dev, dr); + + return 0; +} + +/** * devm_gpio_free - free an interrupt * @dev: device to free gpio for * @gpio: gpio to free |