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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>
This commit is contained in:
Mika Westerberg 2014-10-27 23:29:32 +01:00 committed by Rafael J. Wysocki
parent c479ff0933
commit 5c51277a9a
2 changed files with 46 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
drivers/leds/leds-gpio.c
View File

@ -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 @@ static void gpio_led_work(struct work_struct *work)
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 @@ static void gpio_led_set(struct led_classdev *led_cdev,
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 @@ static void gpio_led_set(struct led_classdev *led_cdev,
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 @@ static int gpio_blink_set(struct led_classdev *led_cdev,
{
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 @@ static int create_gpio_led(const struct gpio_led *template,
{
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 @@ static int create_gpio_led(const struct gpio_led *template,
}
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);
}

1
include/linux/leds.h
View File

@ -261,6 +261,7 @@ struct gpio_led {
unsigned retain_state_suspended : 1;
unsigned default_state : 2;
/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
struct gpio_desc *gpiod;
};
#define LEDS_GPIO_DEFSTATE_OFF 0
#define LEDS_GPIO_DEFSTATE_ON 1