mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-28 09:39:00 +00:00
5e43b934fd
The backported patch introduces new flags to automatically export GPIOs when using the convenience unctions gpio_request_one() or gpio_request_array(). This will be used by ar71xx/ramips platforms. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> SVN-Revision: 34081
69 lines
2.2 KiB
Diff
69 lines
2.2 KiB
Diff
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
|