diff options
Diffstat (limited to 'drivers/gpio/gpiolib-sysfs.c')
| -rw-r--r-- | drivers/gpio/gpiolib-sysfs.c | 48 |
1 files changed, 2 insertions, 46 deletions
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index aeb73ef2955e..9dcd346a20fb 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -308,8 +308,8 @@ static int sysfs_set_active_low(struct gpio_desc *desc, struct device *dev, clear_bit(FLAG_ACTIVE_LOW, &desc->flags); /* reconfigure poll(2) support if enabled on one edge only */ - if (dev != NULL && (!!test_bit(FLAG_TRIG_RISE, &desc->flags) ^ - !!test_bit(FLAG_TRIG_FALL, &desc->flags))) { + if (!!test_bit(FLAG_TRIG_RISE, &desc->flags) ^ + !!test_bit(FLAG_TRIG_FALL, &desc->flags)) { unsigned long trigger_flags = desc->flags & GPIO_TRIGGER_MASK; gpio_setup_irq(desc, dev, 0); @@ -681,50 +681,6 @@ int gpiod_export_link(struct device *dev, const char *name, EXPORT_SYMBOL_GPL(gpiod_export_link); /** - * gpiod_sysfs_set_active_low - set the polarity of gpio sysfs value - * @gpio: gpio to change - * @value: non-zero to use active low, i.e. inverted values - * - * Set the polarity of /sys/class/gpio/gpioN/value sysfs attribute. - * The GPIO does not have to be exported yet. If poll(2) support has - * been enabled for either rising or falling edge, it will be - * reconfigured to follow the new polarity. - * - * Returns zero on success, else an error. - */ -int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value) -{ - struct device *dev = NULL; - int status = -EINVAL; - - if (!desc) { - pr_warn("%s: invalid GPIO\n", __func__); - return -EINVAL; - } - - mutex_lock(&sysfs_lock); - - if (test_bit(FLAG_EXPORT, &desc->flags)) { - dev = class_find_device(&gpio_class, NULL, desc, match_export); - if (dev == NULL) { - status = -ENODEV; - goto unlock; - } - } - - status = sysfs_set_active_low(desc, dev, value); - put_device(dev); -unlock: - mutex_unlock(&sysfs_lock); - - if (status) - gpiod_dbg(desc, "%s: status %d\n", __func__, status); - - return status; -} -EXPORT_SYMBOL_GPL(gpiod_sysfs_set_active_low); - -/** * gpiod_unexport - reverse effect of gpio_export() * @gpio: gpio to make unavailable * |