[PATCH v3 2/4] gpiolib: add gpio_request_{in,out}put support

[Antony Pavlov]

gpio_request() followed by gpio_direction_{in,out}put
is a gpio usage pattern (e.g. the similar functions
are used in a ARM boards code).

Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
---
 drivers/gpio/gpio.c |   40 ++++++++++++++++++++++++++++++++++++++++
 include/gpio.h      |   13 +++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
index d37f5a0..c0c66ae 100644
--- a/drivers/gpio/gpio.c
+++ b/drivers/gpio/gpio.c
@@ -47,6 +47,46 @@ int gpio_request(unsigned gpio, const char *label)
 	return 0;
 }
 
+int gpio_request_input(unsigned gpio, const char *label)
+{
+	int ret;
+
+	ret = gpio_request(gpio, label);
+	if (ret) {
+		pr_err("can't request gpio %d as %s (%d)\n",
+			gpio, label, ret);
+		return ret;
+	}
+
+	ret = gpio_direction_input(gpio);
+	if (ret) {
+		pr_err("can't configure gpio %d (%s) as input (%d)\n",
+			gpio, label, ret);
+	}
+
+	return ret;
+}
+
+int gpio_request_output(unsigned gpio, const char *label, int value)
+{
+	int ret;
+
+	ret = gpio_request(gpio, label);
+	if (ret) {
+		pr_err("can't request gpio %d as %s (%d)\n",
+			gpio, label, ret);
+		return ret;
+	}
+
+	ret = gpio_direction_output(gpio, value);
+	if (ret) {
+		pr_err("can't configure gpio %d (%s) as output (%d)\n",
+			gpio, label, ret);
+	}
+
+	return ret;
+}
+
 void gpio_free(unsigned gpio)
 {
 	struct gpio_info *gi = &gpio_desc[gpio];
diff --git a/include/gpio.h b/include/gpio.h
index 794d959..309c1c5 100644
--- a/include/gpio.h
+++ b/include/gpio.h
@@ -9,11 +9,24 @@ static inline int gpio_request(unsigned gpio, const char *label)
 	return 0;
 }
 
+static inline int gpio_request_input(unsigned gpio, const char *label)
+{
+	return 0;
+}
+
+static inline int gpio_request_output(unsigned gpio, const char *label,
+		int value)
+{
+	return 0;
+}
+
 static inline void gpio_free(unsigned gpio)
 {
 }
 #else
 int gpio_request(unsigned gpio, const char *label);
+int gpio_request_input(unsigned gpio, const char *label);
+int gpio_request_output(unsigned gpio, const char *label, int value);
 void gpio_free(unsigned gpio);
 #endif
 
-- 
1.7.10.4