lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

gpiolib: allow GPIOs to be named

Browse Source 
Allow GPIOs in GPIOLIB chips to be named.  This name is then used when the
GPIO is exported to sysfs, although it could be used elsewhere if deemed
useful.

Signed-off-by: Daniel Silverstone <dsilvers@simtec.co.uk>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Silverstone
2009-04-02 16:57:05 -07:00
committed by Linus Torvalds
parent f30281f4f7
commit 926b663ce8
2 changed files with 11 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpio/gpiolib.c
View File

@@ -438,6 +438,7 @@ int gpio_export(unsigned gpio, bool direction_may_change)
unsigned long flags;
struct gpio_desc *desc;
int status = -EINVAL;
char *ioname = NULL;
/* can't export until sysfs is available ... */
if (!gpio_class.p) {
@@ -461,11 +462,14 @@ int gpio_export(unsigned gpio, bool direction_may_change)
}
spin_unlock_irqrestore(&gpio_lock, flags);
if (desc->chip->names && desc->chip->names[gpio - desc->chip->base])
ioname = desc->chip->names[gpio - desc->chip->base];
if (status == 0) {
struct device *dev;
dev = device_create(&gpio_class, desc->chip->dev, MKDEV(0, 0),
desc, "gpio%d", gpio);
desc, ioname ? ioname : "gpio%d", gpio);
if (dev) {
if (direction_may_change)
status = sysfs_create_group(&dev->kobj,
@@ -513,6 +517,7 @@ void gpio_unexport(unsigned gpio)
mutex_lock(&sysfs_lock);
desc = &gpio_desc[gpio];
if (test_bit(FLAG_EXPORT, &desc->flags)) {
struct device *dev = NULL;