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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2018-07-02 20:05:21 (GMT)
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2018-07-05 21:21:10 (GMT)
commit2282e125a406e09331c5a785e3df29035c99a607 (patch)
treeb5936ee2bde7c85bf71aaff259026857b2bda6d9 /drivers/leds
parent033692eb3ec8305f6e9998b297aaec6899680637 (diff)
leds: triggers: let struct led_trigger::activate() return an error code
Given that activating a trigger can fail, let the callback return an indication. This prevents to have a trigger active according to the "trigger" sysfs attribute but not functional. All users are changed accordingly to return 0 for now. There is no intended change in behaviour. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/led-triggers.c24
-rw-r--r--drivers/leds/trigger/ledtrig-activity.c8
-rw-r--r--drivers/leds/trigger/ledtrig-backlight.c8
-rw-r--r--drivers/leds/trigger/ledtrig-default-on.c3
-rw-r--r--drivers/leds/trigger/ledtrig-gpio.c8
-rw-r--r--drivers/leds/trigger/ledtrig-heartbeat.c8
-rw-r--r--drivers/leds/trigger/ledtrig-netdev.c8
-rw-r--r--drivers/leds/trigger/ledtrig-oneshot.c8
-rw-r--r--drivers/leds/trigger/ledtrig-timer.c8
-rw-r--r--drivers/leds/trigger/ledtrig-transient.c8
10 files changed, 63 insertions, 28 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 431123b..a8786f4 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -103,15 +103,16 @@ ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
EXPORT_SYMBOL_GPL(led_trigger_show);
/* Caller must ensure led_cdev->trigger_lock held */
-void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
+int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
{
unsigned long flags;
char *event = NULL;
char *envp[2];
const char *name;
+ int ret;
if (!led_cdev->trigger && !trig)
- return;
+ return 0;
name = trig ? trig->name : "none";
event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);
@@ -134,8 +135,14 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
write_unlock_irqrestore(&trig->leddev_list_lock, flags);
led_cdev->trigger = trig;
+
if (trig->activate)
- trig->activate(led_cdev);
+ ret = trig->activate(led_cdev);
+ else
+ ret = 0;
+
+ if (ret)
+ goto err_activate;
}
if (event) {
@@ -146,6 +153,17 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
"%s: Error sending uevent\n", __func__);
kfree(event);
}
+
+ return 0;
+
+err_activate:
+ led_cdev->trigger = NULL;
+ write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
+ list_del(&led_cdev->trig_list);
+ write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags);
+ led_set_brightness(led_cdev, LED_OFF);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(led_trigger_set);
diff --git a/drivers/leds/trigger/ledtrig-activity.c b/drivers/leds/trigger/ledtrig-activity.c
index b39e1bb..2fc065f 100644
--- a/drivers/leds/trigger/ledtrig-activity.c
+++ b/drivers/leds/trigger/ledtrig-activity.c
@@ -178,20 +178,20 @@ static ssize_t led_invert_store(struct device *dev,
static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
-static void activity_activate(struct led_classdev *led_cdev)
+static int activity_activate(struct led_classdev *led_cdev)
{
struct activity_data *activity_data;
int rc;
activity_data = kzalloc(sizeof(*activity_data), GFP_KERNEL);
if (!activity_data)
- return;
+ return 0;
led_cdev->trigger_data = activity_data;
rc = device_create_file(led_cdev->dev, &dev_attr_invert);
if (rc) {
kfree(led_cdev->trigger_data);
- return;
+ return 0;
}
activity_data->led_cdev = led_cdev;
@@ -201,6 +201,8 @@ static void activity_activate(struct led_classdev *led_cdev)
led_activity_function(&activity_data->timer);
set_bit(LED_BLINK_SW, &led_cdev->work_flags);
led_cdev->activated = true;
+
+ return 0;
}
static void activity_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-backlight.c b/drivers/leds/trigger/ledtrig-backlight.c
index 1ca1f16..8451296 100644
--- a/drivers/leds/trigger/ledtrig-backlight.c
+++ b/drivers/leds/trigger/ledtrig-backlight.c
@@ -97,7 +97,7 @@ static ssize_t bl_trig_invert_store(struct device *dev,
}
static DEVICE_ATTR(inverted, 0644, bl_trig_invert_show, bl_trig_invert_store);
-static void bl_trig_activate(struct led_classdev *led)
+static int bl_trig_activate(struct led_classdev *led)
{
int ret;
@@ -107,7 +107,7 @@ static void bl_trig_activate(struct led_classdev *led)
led->trigger_data = n;
if (!n) {
dev_err(led->dev, "unable to allocate backlight trigger\n");
- return;
+ return 0;
}
ret = device_create_file(led->dev, &dev_attr_inverted);
@@ -124,11 +124,13 @@ static void bl_trig_activate(struct led_classdev *led)
dev_err(led->dev, "unable to register backlight trigger\n");
led->activated = true;
- return;
+ return 0;
err_invert:
led->trigger_data = NULL;
kfree(n);
+
+ return 0;
}
static void bl_trig_deactivate(struct led_classdev *led)
diff --git a/drivers/leds/trigger/ledtrig-default-on.c b/drivers/leds/trigger/ledtrig-default-on.c
index 4ccea04..2996fe6 100644
--- a/drivers/leds/trigger/ledtrig-default-on.c
+++ b/drivers/leds/trigger/ledtrig-default-on.c
@@ -16,9 +16,10 @@
#include <linux/leds.h>
#include "../leds.h"
-static void defon_trig_activate(struct led_classdev *led_cdev)
+static int defon_trig_activate(struct led_classdev *led_cdev)
{
led_set_brightness_nosleep(led_cdev, led_cdev->max_brightness);
+ return 0;
}
static struct led_trigger defon_led_trigger = {
diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c
index 93906a1..f5358c4 100644
--- a/drivers/leds/trigger/ledtrig-gpio.c
+++ b/drivers/leds/trigger/ledtrig-gpio.c
@@ -162,14 +162,14 @@ static ssize_t gpio_trig_gpio_store(struct device *dev,
}
static DEVICE_ATTR(gpio, 0644, gpio_trig_gpio_show, gpio_trig_gpio_store);
-static void gpio_trig_activate(struct led_classdev *led)
+static int gpio_trig_activate(struct led_classdev *led)
{
struct gpio_trig_data *gpio_data;
int ret;
gpio_data = kzalloc(sizeof(*gpio_data), GFP_KERNEL);
if (!gpio_data)
- return;
+ return 0;
ret = device_create_file(led->dev, &dev_attr_gpio);
if (ret)
@@ -187,7 +187,7 @@ static void gpio_trig_activate(struct led_classdev *led)
led->trigger_data = gpio_data;
led->activated = true;
- return;
+ return 0;
err_brightness:
device_remove_file(led->dev, &dev_attr_inverted);
@@ -197,6 +197,8 @@ err_inverted:
err_gpio:
kfree(gpio_data);
+
+ return 0;
}
static void gpio_trig_deactivate(struct led_classdev *led)
diff --git a/drivers/leds/trigger/ledtrig-heartbeat.c b/drivers/leds/trigger/ledtrig-heartbeat.c
index 304b929..03a8dfc 100644
--- a/drivers/leds/trigger/ledtrig-heartbeat.c
+++ b/drivers/leds/trigger/ledtrig-heartbeat.c
@@ -121,21 +121,21 @@ static ssize_t led_invert_store(struct device *dev,
static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
-static void heartbeat_trig_activate(struct led_classdev *led_cdev)
+static int heartbeat_trig_activate(struct led_classdev *led_cdev)
{
struct heartbeat_trig_data *heartbeat_data;
int rc;
heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL);
if (!heartbeat_data)
- return;
+ return 0;
led_cdev->trigger_data = heartbeat_data;
heartbeat_data->led_cdev = led_cdev;
rc = device_create_file(led_cdev->dev, &dev_attr_invert);
if (rc) {
kfree(led_cdev->trigger_data);
- return;
+ return 0;
}
timer_setup(&heartbeat_data->timer, led_heartbeat_function, 0);
@@ -145,6 +145,8 @@ static void heartbeat_trig_activate(struct led_classdev *led_cdev)
led_heartbeat_function(&heartbeat_data->timer);
set_bit(LED_BLINK_SW, &led_cdev->work_flags);
led_cdev->activated = true;
+
+ return 0;
}
static void heartbeat_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 6df4781..bb059372 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -388,14 +388,14 @@ static void netdev_trig_work(struct work_struct *work)
(atomic_read(&trigger_data->interval)*2));
}
-static void netdev_trig_activate(struct led_classdev *led_cdev)
+static int netdev_trig_activate(struct led_classdev *led_cdev)
{
struct led_netdev_data *trigger_data;
int rc;
trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
if (!trigger_data)
- return;
+ return 0;
spin_lock_init(&trigger_data->lock);
@@ -432,7 +432,7 @@ static void netdev_trig_activate(struct led_classdev *led_cdev)
rc = register_netdevice_notifier(&trigger_data->notifier);
if (rc)
goto err_out_interval;
- return;
+ return 0;
err_out_interval:
device_remove_file(led_cdev->dev, &dev_attr_interval);
@@ -447,6 +447,8 @@ err_out_device_name:
err_out:
led_cdev->trigger_data = NULL;
kfree(trigger_data);
+
+ return 0;
}
static void netdev_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-oneshot.c b/drivers/leds/trigger/ledtrig-oneshot.c
index b8ea9f0..7bbf92b 100644
--- a/drivers/leds/trigger/ledtrig-oneshot.c
+++ b/drivers/leds/trigger/ledtrig-oneshot.c
@@ -122,14 +122,14 @@ static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
static DEVICE_ATTR(shot, 0200, NULL, led_shot);
-static void oneshot_trig_activate(struct led_classdev *led_cdev)
+static int oneshot_trig_activate(struct led_classdev *led_cdev)
{
struct oneshot_trig_data *oneshot_data;
int rc;
oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL);
if (!oneshot_data)
- return;
+ return 0;
led_cdev->trigger_data = oneshot_data;
@@ -151,7 +151,7 @@ static void oneshot_trig_activate(struct led_classdev *led_cdev)
led_cdev->activated = true;
- return;
+ return 0;
err_out_invert:
device_remove_file(led_cdev->dev, &dev_attr_invert);
@@ -161,6 +161,8 @@ err_out_delayon:
device_remove_file(led_cdev->dev, &dev_attr_delay_on);
err_out_trig_data:
kfree(led_cdev->trigger_data);
+
+ return 0;
}
static void oneshot_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-timer.c b/drivers/leds/trigger/ledtrig-timer.c
index 10fc096..527055d 100644
--- a/drivers/leds/trigger/ledtrig-timer.c
+++ b/drivers/leds/trigger/ledtrig-timer.c
@@ -70,7 +70,7 @@ static ssize_t led_delay_off_store(struct device *dev,
static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
-static void timer_trig_activate(struct led_classdev *led_cdev)
+static int timer_trig_activate(struct led_classdev *led_cdev)
{
int rc;
@@ -78,7 +78,7 @@ static void timer_trig_activate(struct led_classdev *led_cdev)
rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
if (rc)
- return;
+ return 0;
rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
if (rc)
goto err_out_delayon;
@@ -87,10 +87,12 @@ static void timer_trig_activate(struct led_classdev *led_cdev)
&led_cdev->blink_delay_off);
led_cdev->activated = true;
- return;
+ return 0;
err_out_delayon:
device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+
+ return 0;
}
static void timer_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-transient.c b/drivers/leds/trigger/ledtrig-transient.c
index 9d17690..a55fc58 100644
--- a/drivers/leds/trigger/ledtrig-transient.c
+++ b/drivers/leds/trigger/ledtrig-transient.c
@@ -152,7 +152,7 @@ static DEVICE_ATTR(duration, 0644, transient_duration_show,
transient_duration_store);
static DEVICE_ATTR(state, 0644, transient_state_show, transient_state_store);
-static void transient_trig_activate(struct led_classdev *led_cdev)
+static int transient_trig_activate(struct led_classdev *led_cdev)
{
int rc;
struct transient_trig_data *tdata;
@@ -161,7 +161,7 @@ static void transient_trig_activate(struct led_classdev *led_cdev)
if (!tdata) {
dev_err(led_cdev->dev,
"unable to allocate transient trigger\n");
- return;
+ return 0;
}
led_cdev->trigger_data = tdata;
tdata->led_cdev = led_cdev;
@@ -181,7 +181,7 @@ static void transient_trig_activate(struct led_classdev *led_cdev)
timer_setup(&tdata->timer, transient_timer_function, 0);
led_cdev->activated = true;
- return;
+ return 0;
err_out_state:
device_remove_file(led_cdev->dev, &dev_attr_duration);
@@ -191,6 +191,8 @@ err_out:
dev_err(led_cdev->dev, "unable to register transient trigger\n");
led_cdev->trigger_data = NULL;
kfree(tdata);
+
+ return 0;
}
static void transient_trig_deactivate(struct led_classdev *led_cdev)

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