diff options
author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2018-07-02 22:05:21 +0200 |
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committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2018-07-05 23:21:10 +0200 |
commit | 2282e125a406e09331c5a785e3df29035c99a607 (patch) | |
tree | b5936ee2bde7c85bf71aaff259026857b2bda6d9 /drivers/leds | |
parent | 033692eb3ec8305f6e9998b297aaec6899680637 (diff) | |
download | op-kernel-dev-2282e125a406e09331c5a785e3df29035c99a607.zip op-kernel-dev-2282e125a406e09331c5a785e3df29035c99a607.tar.gz |
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.c | 24 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-activity.c | 8 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-backlight.c | 8 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-default-on.c | 3 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-gpio.c | 8 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-heartbeat.c | 8 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-netdev.c | 8 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-oneshot.c | 8 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-timer.c | 8 | ||||
-rw-r--r-- | drivers/leds/trigger/ledtrig-transient.c | 8 |
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) |