Commit 926b663c authored by Daniel Silverstone's avatar Daniel Silverstone Committed by Linus Torvalds
Browse files

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
Signed-off-by: default avatarDaniel Silverstone <>
Cc: David Brownell <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent f30281f4
......@@ -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)
desc = &gpio_desc[gpio];
if (test_bit(FLAG_EXPORT, &desc->flags)) {
struct device *dev = NULL;
......@@ -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;
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