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authorDaniel Silverstone <dsilvers@simtec.co.uk>2009-04-02 16:57:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:04:51 -0700
commit926b663ce8215ba448960e1ff6e58b67a2c3b99b (patch)
treed60e6add2528b6a61968b0dc2db2f162bb157639 /drivers/gpio
parentf30281f4f7c2a0efcfeddad12277dfdada8f08a7 (diff)
downloadop-kernel-dev-926b663ce8215ba448960e1ff6e58b67a2c3b99b.zip
op-kernel-dev-926b663ce8215ba448960e1ff6e58b67a2c3b99b.tar.gz
gpiolib: allow GPIOs to be named
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>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 42fb2fd..83c3fe3 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -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;
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