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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 <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
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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;

5
include/asm-generic/gpio.h
View file

@ -55,6 +55,10 @@ struct module;
* handled is (base + ngpio - 1).
* @can_sleep: flag must be set iff get()/set() methods sleep, as they
* must while accessing GPIO expander chips over I2C or SPI
* @names: if set, must be an array of strings to use as alternative
* names for the GPIOs in this chip. Any entry in the array
* may be NULL if there is no alias for the GPIO, however the
* array must be @ngpio entries long.
*
* A gpio_chip can help platforms abstract various sources of GPIOs so
* they can all be accessed through a common programing interface.
@ -92,6 +96,7 @@ struct gpio_chip {
struct gpio_chip *chip);
int base;
u16 ngpio;
char **names;
unsigned can_sleep:1;
unsigned exported:1;
};