diff options
| -rw-r--r-- | target/linux/generic/patches-3.3/070-gpio-add-flags-to-export-GPIOs-when-requesting.patch | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.3/070-gpio-add-flags-to-export-GPIOs-when-requesting.patch b/target/linux/generic/patches-3.3/070-gpio-add-flags-to-export-GPIOs-when-requesting.patch new file mode 100644 index 000000000..fb4387eb2 --- /dev/null +++ b/target/linux/generic/patches-3.3/070-gpio-add-flags-to-export-GPIOs-when-requesting.patch @@ -0,0 +1,68 @@ +From fc3a1f04f5040255cbc086c419e4237f29f89f88 Mon Sep 17 00:00:00 2001 +From: Wolfram Sang <w.sang@pengutronix.de> +Date: Tue, 13 Dec 2011 18:34:01 +0100 +Subject: [PATCH] gpio: add flags to export GPIOs when requesting + +commit fc3a1f04f5040255cbc086c419e4237f29f89f88 upstream. + +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> +Signed-off-by: Grant Likely <grant.likely@secretlab.ca> +--- + Documentation/gpio.txt | 3 +++ + drivers/gpio/gpiolib.c | 12 +++++++++++- + include/linux/gpio.h | 5 +++++ + 3 files changed, 19 insertions(+), 1 deletion(-) + +--- a/Documentation/gpio.txt ++++ b/Documentation/gpio.txt +@@ -303,6 +303,9 @@ where 'flags' is currently defined to sp + * 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: + +--- a/drivers/gpio/gpiolib.c ++++ b/drivers/gpio/gpiolib.c +@@ -1289,8 +1289,18 @@ int gpio_request_one(unsigned gpio, unsi + (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); +--- 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 |