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Date: Mon, 28 Sep 2015 15:07:14 +0200
From: Jacek Anaszewski <j.anaszewski@...sung.com>
To: linux-leds@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, sakari.ailus@...ux.intel.com,
andrew@...n.ch, rpurdie@...ys.net,
Jacek Anaszewski <j.anaszewski@...sung.com>
Subject: [PATCH v2 05/12] leds: core: Add an internal
led_set_brightness_nosleep function
This patch adds led_set_brightness_nosleep function, which guarantees
setting LED brightness in a non-blocking way. It also replaces
led_set_brightness_async with led_set_brightness_nosleep in all places
where the most vital was setting brightness in a non sleeping way but
not necessarily asynchronously, which is not needed for non-blocking
drivers.
Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
---
drivers/leds/led-core.c | 31 ++++++++++++++++++++++++-----
drivers/leds/leds.h | 2 ++
drivers/leds/trigger/ledtrig-backlight.c | 8 ++++----
drivers/leds/trigger/ledtrig-default-on.c | 2 +-
drivers/leds/trigger/ledtrig-gpio.c | 6 +++---
drivers/leds/trigger/ledtrig-heartbeat.c | 4 ++--
drivers/leds/trigger/ledtrig-oneshot.c | 4 ++--
drivers/leds/trigger/ledtrig-transient.c | 8 ++++----
8 files changed, 44 insertions(+), 21 deletions(-)
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 7cf5924..865f73c 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -32,7 +32,7 @@ static void led_timer_function(unsigned long data)
unsigned long delay;
if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
- led_set_brightness_async(led_cdev, LED_OFF);
+ led_set_brightness_nosleep(led_cdev, LED_OFF);
return;
}
@@ -60,7 +60,7 @@ static void led_timer_function(unsigned long data)
delay = led_cdev->blink_delay_off;
}
- led_set_brightness_async(led_cdev, brightness);
+ led_set_brightness_nosleep(led_cdev, brightness);
/* Return in next iteration if led is in one-shot mode and we are in
* the final blink state so that the led is toggled each delay_on +
@@ -110,13 +110,14 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
/* never on - just set to off */
if (!delay_on) {
- led_set_brightness_async(led_cdev, LED_OFF);
+ led_set_brightness_nosleep(led_cdev, LED_OFF);
return;
}
/* never off - just set to brightness */
if (!delay_off) {
- led_set_brightness_async(led_cdev, led_cdev->blink_brightness);
+ led_set_brightness_nosleep(led_cdev,
+ led_cdev->blink_brightness);
return;
}
@@ -217,7 +218,7 @@ void led_set_brightness(struct led_classdev *led_cdev,
}
if (led_cdev->flags & SET_BRIGHTNESS_ASYNC) {
- led_set_brightness_async(led_cdev, brightness);
+ led_set_brightness_nosleep(led_cdev, brightness);
return;
} else if (led_cdev->flags & SET_BRIGHTNESS_SYNC)
ret = led_set_brightness_sync(led_cdev, brightness);
@@ -230,6 +231,26 @@ void led_set_brightness(struct led_classdev *led_cdev,
}
EXPORT_SYMBOL_GPL(led_set_brightness);
+void led_set_brightness_nosleep(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ led_cdev->brightness = min(value, led_cdev->max_brightness);
+
+ if (led_cdev->flags & LED_SUSPENDED)
+ return;
+
+ /* Use brightness_set op if available, it is guaranteed not to sleep */
+ if (led_cdev->brightness_set) {
+ led_cdev->brightness_set(led_cdev, led_cdev->brightness);
+ return;
+ }
+
+ /* If brightness setting can sleep, delegate it to a work queue task */
+ led_cdev->delayed_set_value = led_cdev->brightness;
+ schedule_work(&led_cdev->set_brightness_work);
+}
+EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
+
int led_update_brightness(struct led_classdev *led_cdev)
{
int ret = 0;
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index cf6d448..11520eb 100644
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -46,6 +46,8 @@ static inline int led_get_brightness(struct led_classdev *led_cdev)
void led_init_core(struct led_classdev *led_cdev);
void led_stop_software_blink(struct led_classdev *led_cdev);
+void led_set_brightness_nosleep(struct led_classdev *led_cdev,
+ enum led_brightness value);
extern struct rw_semaphore leds_list_lock;
extern struct list_head leds_list;
diff --git a/drivers/leds/trigger/ledtrig-backlight.c b/drivers/leds/trigger/ledtrig-backlight.c
index 59eca17..1ca1f16 100644
--- a/drivers/leds/trigger/ledtrig-backlight.c
+++ b/drivers/leds/trigger/ledtrig-backlight.c
@@ -51,9 +51,9 @@ static int fb_notifier_callback(struct notifier_block *p,
if ((n->old_status == UNBLANK) ^ n->invert) {
n->brightness = led->brightness;
- led_set_brightness_async(led, LED_OFF);
+ led_set_brightness_nosleep(led, LED_OFF);
} else {
- led_set_brightness_async(led, n->brightness);
+ led_set_brightness_nosleep(led, n->brightness);
}
n->old_status = new_status;
@@ -89,9 +89,9 @@ static ssize_t bl_trig_invert_store(struct device *dev,
/* After inverting, we need to update the LED. */
if ((n->old_status == BLANK) ^ n->invert)
- led_set_brightness_async(led, LED_OFF);
+ led_set_brightness_nosleep(led, LED_OFF);
else
- led_set_brightness_async(led, n->brightness);
+ led_set_brightness_nosleep(led, n->brightness);
return num;
}
diff --git a/drivers/leds/trigger/ledtrig-default-on.c b/drivers/leds/trigger/ledtrig-default-on.c
index 6f38f88..ff455cb 100644
--- a/drivers/leds/trigger/ledtrig-default-on.c
+++ b/drivers/leds/trigger/ledtrig-default-on.c
@@ -19,7 +19,7 @@
static void defon_trig_activate(struct led_classdev *led_cdev)
{
- led_set_brightness_async(led_cdev, led_cdev->max_brightness);
+ led_set_brightness_nosleep(led_cdev, led_cdev->max_brightness);
}
static struct led_trigger defon_led_trigger = {
diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c
index 4cc7040..51288a4 100644
--- a/drivers/leds/trigger/ledtrig-gpio.c
+++ b/drivers/leds/trigger/ledtrig-gpio.c
@@ -54,12 +54,12 @@ static void gpio_trig_work(struct work_struct *work)
if (tmp) {
if (gpio_data->desired_brightness)
- led_set_brightness_async(gpio_data->led,
+ led_set_brightness_nosleep(gpio_data->led,
gpio_data->desired_brightness);
else
- led_set_brightness_async(gpio_data->led, LED_FULL);
+ led_set_brightness_nosleep(gpio_data->led, LED_FULL);
} else {
- led_set_brightness_async(gpio_data->led, LED_OFF);
+ led_set_brightness_nosleep(gpio_data->led, LED_OFF);
}
}
diff --git a/drivers/leds/trigger/ledtrig-heartbeat.c b/drivers/leds/trigger/ledtrig-heartbeat.c
index fea6871..3dc6f0c 100644
--- a/drivers/leds/trigger/ledtrig-heartbeat.c
+++ b/drivers/leds/trigger/ledtrig-heartbeat.c
@@ -37,7 +37,7 @@ static void led_heartbeat_function(unsigned long data)
unsigned long delay = 0;
if (unlikely(panic_heartbeats)) {
- led_set_brightness(led_cdev, LED_OFF);
+ led_set_brightness_nosleep(led_cdev, LED_OFF);
return;
}
@@ -74,7 +74,7 @@ static void led_heartbeat_function(unsigned long data)
break;
}
- led_set_brightness_async(led_cdev, brightness);
+ led_set_brightness_nosleep(led_cdev, brightness);
mod_timer(&heartbeat_data->timer, jiffies + delay);
}
diff --git a/drivers/leds/trigger/ledtrig-oneshot.c b/drivers/leds/trigger/ledtrig-oneshot.c
index fbd02cd..6729317 100644
--- a/drivers/leds/trigger/ledtrig-oneshot.c
+++ b/drivers/leds/trigger/ledtrig-oneshot.c
@@ -63,9 +63,9 @@ static ssize_t led_invert_store(struct device *dev,
oneshot_data->invert = !!state;
if (oneshot_data->invert)
- led_set_brightness_async(led_cdev, LED_FULL);
+ led_set_brightness_nosleep(led_cdev, LED_FULL);
else
- led_set_brightness_async(led_cdev, LED_OFF);
+ led_set_brightness_nosleep(led_cdev, LED_OFF);
return size;
}
diff --git a/drivers/leds/trigger/ledtrig-transient.c b/drivers/leds/trigger/ledtrig-transient.c
index 3c34de4..1dddd8f 100644
--- a/drivers/leds/trigger/ledtrig-transient.c
+++ b/drivers/leds/trigger/ledtrig-transient.c
@@ -41,7 +41,7 @@ static void transient_timer_function(unsigned long data)
struct transient_trig_data *transient_data = led_cdev->trigger_data;
transient_data->activate = 0;
- led_set_brightness_async(led_cdev, transient_data->restore_state);
+ led_set_brightness_nosleep(led_cdev, transient_data->restore_state);
}
static ssize_t transient_activate_show(struct device *dev,
@@ -72,7 +72,7 @@ static ssize_t transient_activate_store(struct device *dev,
if (state == 0 && transient_data->activate == 1) {
del_timer(&transient_data->timer);
transient_data->activate = state;
- led_set_brightness_async(led_cdev,
+ led_set_brightness_nosleep(led_cdev,
transient_data->restore_state);
return size;
}
@@ -81,7 +81,7 @@ static ssize_t transient_activate_store(struct device *dev,
if (state == 1 && transient_data->activate == 0 &&
transient_data->duration != 0) {
transient_data->activate = state;
- led_set_brightness_async(led_cdev, transient_data->state);
+ led_set_brightness_nosleep(led_cdev, transient_data->state);
transient_data->restore_state =
(transient_data->state == LED_FULL) ? LED_OFF : LED_FULL;
mod_timer(&transient_data->timer,
@@ -204,7 +204,7 @@ static void transient_trig_deactivate(struct led_classdev *led_cdev)
if (led_cdev->activated) {
del_timer_sync(&transient_data->timer);
- led_set_brightness_async(led_cdev,
+ led_set_brightness_nosleep(led_cdev,
transient_data->restore_state);
device_remove_file(led_cdev->dev, &dev_attr_activate);
device_remove_file(led_cdev->dev, &dev_attr_duration);
--
1.7.9.5
--
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