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gpiolib: allow GPIOs to be named

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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 <[email protected]>
Cc: David Brownell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Daniel Silverstone 2009-04-02 16:57:05 -07:00 • committed by Linus Torvalds
commit 926b663ce8
2 changed files with 11 additions and 1 deletions
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7
drivers/gpio/gpiolib.c
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@ -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;