The patch titled
gpio: introduce gpio_request_one() and friends
has been added to the -mm tree. Its filename is
gpio-introduce-gpio_request_one-and-friends.patch
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------------------------------------------------------
Subject: gpio: introduce gpio_request_one() and friends
From: Eric Miao <eric.y.miao@xxxxxxxxx>
gpio_request() without initial configuration of the GPIO is normally
useless, introduce gpio_request_one() together with GPIOF_ flags for
input/output direction and initial output level.
gpio_{request,free}_array() for multiple GPIOs.
Signed-off-by: Eric Miao <eric.y.miao@xxxxxxxxx>
Cc: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: Ben Nizette <bn@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/gpio/gpiolib.c | 42 +++++++++++++++++++++++++++++++++++
include/asm-generic/gpio.h | 20 ++++++++++++++++
2 files changed, 62 insertions(+)
diff -puN drivers/gpio/gpiolib.c~gpio-introduce-gpio_request_one-and-friends drivers/gpio/gpiolib.c
--- a/drivers/gpio/gpiolib.c~gpio-introduce-gpio_request_one-and-friends
+++ a/drivers/gpio/gpiolib.c
@@ -1237,6 +1237,48 @@ void gpio_free(unsigned gpio)
}
EXPORT_SYMBOL_GPL(gpio_free);
+int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
+{
+ int err;
+
+ err = gpio_request(gpio, label);
+ if (err)
+ return err;
+
+ if (flags & GPIOF_DIR_IN)
+ err = gpio_direction_input(gpio);
+ else
+ err = gpio_direction_output(gpio,
+ (flags & GPIOF_INIT_HIGH) ? 1 : 0);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(gpio_request_one);
+
+int gpio_request_array(struct gpio *array, size_t num)
+{
+ int i, err;
+
+ for (i = 0; i < num; i++, array++) {
+ err = gpio_request_one(array->gpio, array->flags, array->label);
+ if (err)
+ goto err_free;
+ }
+ return 0;
+
+err_free:
+ while (i--)
+ gpio_free((--array)->gpio);
+ return err;
+}
+EXPORT_SYMBOL_GPL(gpio_request_array);
+
+void gpio_free_array(struct gpio *array, size_t num)
+{
+ while (num--)
+ gpio_free((array++)->gpio);
+}
+EXPORT_SYMBOL_GPL(gpio_free_array);
/**
* gpiochip_is_requested - return string iff signal was requested
diff -puN include/asm-generic/gpio.h~gpio-introduce-gpio_request_one-and-friends include/asm-generic/gpio.h
--- a/include/asm-generic/gpio.h~gpio-introduce-gpio_request_one-and-friends
+++ a/include/asm-generic/gpio.h
@@ -136,6 +136,26 @@ extern int __gpio_cansleep(unsigned gpio
extern int __gpio_to_irq(unsigned gpio);
+#define GPIOF_DIR_OUT (0 << 0)
+#define GPIOF_DIR_IN (1 << 0)
+
+#define GPIOF_INIT_LOW (0 << 1)
+#define GPIOF_INIT_HIGH (1 << 1)
+
+#define GPIOF_IN (GPIOF_DIR_IN)
+#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
+#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
+
+struct gpio {
+ unsigned gpio;
+ unsigned long flags;
+ const char *label;
+};
+
+extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
+extern int gpio_request_array(struct gpio *array, size_t num);
+extern void gpio_free_array(struct gpio *array, size_t num);
+
#ifdef CONFIG_GPIO_SYSFS
/*
_
Patches currently in -mm which might be from eric.y.miao@xxxxxxxxx are
origin.patch
linux-next.patch
arch-arm-plat-pxa-dmac-correct-null-test.patch
gpio-introduce-gpio_request_one-and-friends.patch
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