leds: leds-gpio: Add support for GPIO descriptors
GPIO descriptors are the preferred way over legacy GPIO numbers
nowadays. Convert the driver to use GPIO descriptors internally but
still allow passing legacy GPIO numbers from platform data to support
existing platforms.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Bryan Wu <cooloney@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index b4518c8..1ff95ce 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -12,6 +12,7 @@
*/
#include <linux/err.h>
#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
@@ -24,11 +25,10 @@
struct gpio_led_data {
struct led_classdev cdev;
- unsigned gpio;
+ struct gpio_desc *gpiod;
struct work_struct work;
u8 new_level;
u8 can_sleep;
- u8 active_low;
u8 blinking;
int (*platform_gpio_blink_set)(unsigned gpio, int state,
unsigned long *delay_on, unsigned long *delay_off);
@@ -40,12 +40,16 @@
container_of(work, struct gpio_led_data, work);
if (led_dat->blinking) {
- led_dat->platform_gpio_blink_set(led_dat->gpio,
- led_dat->new_level,
- NULL, NULL);
+ int gpio = desc_to_gpio(led_dat->gpiod);
+ int level = led_dat->new_level;
+
+ if (gpiod_is_active_low(led_dat->gpiod))
+ level = !level;
+
+ led_dat->platform_gpio_blink_set(gpio, level, NULL, NULL);
led_dat->blinking = 0;
} else
- gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
+ gpiod_set_value_cansleep(led_dat->gpiod, led_dat->new_level);
}
static void gpio_led_set(struct led_classdev *led_cdev,
@@ -60,9 +64,6 @@
else
level = 1;
- if (led_dat->active_low)
- level = !level;
-
/* Setting GPIOs with I2C/etc requires a task context, and we don't
* seem to have a reliable way to know if we're already in one; so
* let's just assume the worst.
@@ -72,11 +73,16 @@
schedule_work(&led_dat->work);
} else {
if (led_dat->blinking) {
- led_dat->platform_gpio_blink_set(led_dat->gpio, level,
- NULL, NULL);
+ int gpio = desc_to_gpio(led_dat->gpiod);
+
+ if (gpiod_is_active_low(led_dat->gpiod))
+ level = !level;
+
+ led_dat->platform_gpio_blink_set(gpio, level, NULL,
+ NULL);
led_dat->blinking = 0;
} else
- gpio_set_value(led_dat->gpio, level);
+ gpiod_set_value(led_dat->gpiod, level);
}
}
@@ -85,9 +91,10 @@
{
struct gpio_led_data *led_dat =
container_of(led_cdev, struct gpio_led_data, cdev);
+ int gpio = desc_to_gpio(led_dat->gpiod);
led_dat->blinking = 1;
- return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK,
+ return led_dat->platform_gpio_blink_set(gpio, GPIO_LED_BLINK,
delay_on, delay_off);
}
@@ -97,24 +104,33 @@
{
int ret, state;
- led_dat->gpio = -1;
+ if (!template->gpiod) {
+ unsigned long flags = 0;
- /* skip leds that aren't available */
- if (!gpio_is_valid(template->gpio)) {
- dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
- template->gpio, template->name);
- return 0;
+ /* skip leds that aren't available */
+ if (!gpio_is_valid(template->gpio)) {
+ dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
+ template->gpio, template->name);
+ return 0;
+ }
+
+ if (template->active_low)
+ flags |= GPIOF_ACTIVE_LOW;
+
+ ret = devm_gpio_request_one(parent, template->gpio, flags,
+ template->name);
+ if (ret < 0)
+ return ret;
+
+ led_dat->gpiod = gpio_to_desc(template->gpio);
+ if (IS_ERR(led_dat->gpiod))
+ return PTR_ERR(led_dat->gpiod);
}
- ret = devm_gpio_request(parent, template->gpio, template->name);
- if (ret < 0)
- return ret;
-
led_dat->cdev.name = template->name;
led_dat->cdev.default_trigger = template->default_trigger;
- led_dat->gpio = template->gpio;
- led_dat->can_sleep = gpio_cansleep(template->gpio);
- led_dat->active_low = template->active_low;
+ led_dat->gpiod = template->gpiod;
+ led_dat->can_sleep = gpiod_cansleep(template->gpiod);
led_dat->blinking = 0;
if (blink_set) {
led_dat->platform_gpio_blink_set = blink_set;
@@ -122,30 +138,24 @@
}
led_dat->cdev.brightness_set = gpio_led_set;
if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
- state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low;
+ state = !!gpiod_get_value_cansleep(led_dat->gpiod);
else
state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
if (!template->retain_state_suspended)
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
- ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
+ ret = gpiod_direction_output(led_dat->gpiod, state);
if (ret < 0)
return ret;
INIT_WORK(&led_dat->work, gpio_led_work);
- ret = led_classdev_register(parent, &led_dat->cdev);
- if (ret < 0)
- return ret;
-
- return 0;
+ return led_classdev_register(parent, &led_dat->cdev);
}
static void delete_gpio_led(struct gpio_led_data *led)
{
- if (!gpio_is_valid(led->gpio))
- return;
led_classdev_unregister(&led->cdev);
cancel_work_sync(&led->work);
}