Messages in this thread Patch in this message | | | From | Wolfram Sang <> | Subject | [PATCH] gpio: add flags to export GPIOs when requesting | Date | Tue, 15 Nov 2011 23:44:34 +0100 |
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Introduce new flags to automatically export GPIOs when using the convenience functions gpio_request_one() or gpio_request_array(). This eases support for custom boards where lots of GPIOs need to be exported for customer applications.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Cc: Linus Walleij <linus.walleij@linaro.org> ---
Based on 3.2-rc2
Documentation/gpio.txt | 3 +++ drivers/gpio/gpiolib.c | 12 +++++++++++- include/linux/gpio.h | 5 +++++ 3 files changed, 19 insertions(+), 1 deletions(-)
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index 792faa3..9e28c05 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt @@ -303,6 +303,9 @@ where 'flags' is currently defined to specify the following properties: * GPIOF_INIT_LOW - as output, set initial level to LOW * GPIOF_INIT_HIGH - as output, set initial level to HIGH + * GPIOF_EXPORT_DIR_FIXED - export gpio to sysfs, keep direction + * GPIOF_EXPORT_DIR_CHANGEABLE - also export, allow changing direction + since GPIOF_INIT_* are only valid when configured as output, so group valid combinations as: diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index a971e3d..65ba047 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1285,8 +1285,18 @@ int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) (flags & GPIOF_INIT_HIGH) ? 1 : 0); if (err) - gpio_free(gpio); + goto free_gpio; + + if (flags & GPIOF_EXPORT) { + err = gpio_export(gpio, flags & GPIOF_EXPORT_CHANGEABLE); + if (err) + goto free_gpio; + } + + return 0; + free_gpio: + gpio_free(gpio); return err; } EXPORT_SYMBOL_GPL(gpio_request_one); diff --git a/include/linux/gpio.h b/include/linux/gpio.h index 38ac48b..38afe24 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h @@ -14,6 +14,11 @@ #define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW) #define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH) +#define GPIOF_EXPORT (1 << 2) +#define GPIOF_EXPORT_CHANGEABLE (1 << 3) +#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT) +#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE) + /** * struct gpio - a structure describing a GPIO with configuration * @gpio: the GPIO number -- 1.7.2.5
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