From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752759AbbJGJPL (ORCPT ); Wed, 7 Oct 2015 05:15:11 -0400 Received: from mailout1.samsung.com ([203.254.224.24]:60697 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752734AbbJGJLG (ORCPT ); Wed, 7 Oct 2015 05:11:06 -0400 X-AuditID: cbfee61b-f79d56d0000048c5-a2-5614e1a83ba3 From: Jacek Anaszewski To: linux-leds@vger.kernel.org Cc: linux-kernel@vger.kernel.org, pavel@ucw.cz, sakari.ailus@linux.intel.com, andrew@lunn.ch, Jacek Anaszewski Subject: [PATCH v3 03/10] leds: core: Add led_set_brightness_nosleep{nopm} functions Date: Wed, 07 Oct 2015 11:10:41 +0200 Message-id: <1444209048-29415-4-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1444209048-29415-1-git-send-email-j.anaszewski@samsung.com> References: <1444209048-29415-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprALMWRmVeSWpSXmKPExsVy+t9jQd0VD0XCDP4/kbc4f/cQs0Xv1eeM Fpd3zWGz2PpmHaPF3VNH2Sw+bfnG5MDmMe9koMfOHZ+ZPPq2rGL0WLH6O7vH501yAaxRXDYp qTmZZalF+nYJXBnXdr5kL7gQXvF02j7WBsZVXl2MnBwSAiYSp29cZoGwxSQu3FvP1sXIxSEk MItRYtG7f4wQzk9GicNHZjKDVLEJGEr8fPGaqYuRg0NEQE5i55lKkBpmgW5GiWWXuxhBaoQF wiSOPLgNVs8ioCrRcGYvK4jNK+Ah8ffgI3aQXgkBBYk5k2xAwpwCnhKNvSeYQGwhoJLDv76w TWDkXcDIsIpRIrUguaA4KT3XKC+1XK84Mbe4NC9dLzk/dxMjOJyeSe9gPLzL/RCjAAejEg/v D2ORMCHWxLLiytxDjBIczEoivAvvAYV4UxIrq1KL8uOLSnNSiw8xSnOwKInz3jjEECYkkJ5Y kpqdmlqQWgSTZeLglGpgzCuwrEw+mfvHIK4pZyZvz7wNs9a97uU8ZdOZtONoeQ6X7iTf4OeS YVrZwkd4JDczVK9TqM+b5lbStWf94qvrbq8rFunS+sN+2Ghx4p2chaKMtr8/R+p7+135eavU vcgk5pHq8QnRf+dwz7n6xfA9b+RbzRlta6a/XxQTc885o5R3/u1Tca6ZSizFGYmGWsxFxYkA 8ylFsSMCAAA= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds led_set_brightness_nosleep() and led_set_brightness_nopm() functions, that guarantee setting LED brightness in a non-blocking way. The latter is used from pm_ops context and doesn't modify the brightness cached in the struct led_classdev. Its execution always ends up with a call to brightness setting op - either directly or through a set_brightness_work, regardless of LED_SUSPENDED flag state. The patch 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 --- drivers/leds/led-class.c | 4 +-- drivers/leds/led-core.c | 40 ++++++++++++++++++++++++----- drivers/leds/leds.h | 4 +++ 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 +++--- 9 files changed, 56 insertions(+), 24 deletions(-) diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 7385f98..83a1dc7 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -109,7 +109,7 @@ static const struct attribute_group *led_groups[] = { void led_classdev_suspend(struct led_classdev *led_cdev) { led_cdev->flags |= LED_SUSPENDED; - led_cdev->brightness_set(led_cdev, 0); + led_set_brightness_nopm(led_cdev, 0); } EXPORT_SYMBOL_GPL(led_classdev_suspend); @@ -119,7 +119,7 @@ EXPORT_SYMBOL_GPL(led_classdev_suspend); */ void led_classdev_resume(struct led_classdev *led_cdev) { - led_cdev->brightness_set(led_cdev, led_cdev->brightness); + led_set_brightness_nopm(led_cdev, led_cdev->brightness); if (led_cdev->flash_resume) led_cdev->flash_resume(led_cdev); diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c index 1ba7fac..a1f53aa 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 +231,33 @@ void led_set_brightness(struct led_classdev *led_cdev, } EXPORT_SYMBOL(led_set_brightness); +void led_set_brightness_nopm(struct led_classdev *led_cdev, + enum led_brightness value) +{ + /* Use brightness_set op if available, it is guaranteed not to sleep */ + if (led_cdev->brightness_set) { + led_cdev->brightness_set(led_cdev, value); + return; + } + + /* If brightness setting can sleep, delegate it to a work queue task */ + led_cdev->delayed_set_value = value; + schedule_work(&led_cdev->set_brightness_work); +} +EXPORT_SYMBOL_GPL(led_set_brightness_nopm); + +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; + + led_set_brightness_nopm(led_cdev, led_cdev->brightness); +} +EXPORT_SYMBOL_GPL(led_set_brightness_nosleep); + int led_update_brightness(struct led_classdev *led_cdev) { int ret = 0; @@ -244,7 +272,7 @@ int led_update_brightness(struct led_classdev *led_cdev) return ret; } -EXPORT_SYMBOL(led_update_brightness); +EXPORT_SYMBOL_GPL(led_update_brightness); /* Caller must ensure led_cdev->led_access held */ void led_sysfs_disable(struct led_classdev *led_cdev) diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h index cf6d448..8e252a2 100644 --- a/drivers/leds/leds.h +++ b/drivers/leds/leds.h @@ -46,6 +46,10 @@ 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_nopm(struct led_classdev *led_cdev, + enum led_brightness value); +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