From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Subject: [PATCH v2 2/5] gpiolib: add gpio_request_{in,out}put support
Date: Fri, 1 Feb 2013 01:46:33 +0400 [thread overview]
Message-ID: <1359668796-22835-3-git-send-email-antonynpavlov@gmail.com> (raw)
In-Reply-To: <1359668796-22835-1-git-send-email-antonynpavlov@gmail.com>
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@gmail.com>
---
drivers/gpio/gpio.c | 34 ++++++++++++++++++++++++++++++++++
include/gpio.h | 13 +++++++++++++
2 files changed, 47 insertions(+)
diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
index d37f5a0..5876454 100644
--- a/drivers/gpio/gpio.c
+++ b/drivers/gpio/gpio.c
@@ -47,6 +47,40 @@ 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)
+ 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)
+ 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
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next prev parent reply other threads:[~2013-01-31 21:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-31 21:46 [PATCH v2 0/5] " Antony Pavlov
2013-01-31 21:46 ` [PATCH v2 1/5] gpiolib: fix whitespaces Antony Pavlov
2013-01-31 21:46 ` Antony Pavlov [this message]
2013-01-31 21:46 ` [PATCH v2 3/5] gpiolib: gpio_request(): add error message Antony Pavlov
2013-02-01 8:13 ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-01 18:09 ` Antony Pavlov
2013-02-01 18:24 ` Jean-Christophe PLAGNIOL-VILLARD
2013-01-31 21:46 ` [PATCH v2 4/5] at91sam9*: use gpio_request_output() Antony Pavlov
2013-01-31 21:46 ` [PATCH v2 5/5] animeo_ip: use gpio_request_input() Antony Pavlov
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