1c72a1d60SRichard Purdie /* 2c72a1d60SRichard Purdie * LED Class Core 3c72a1d60SRichard Purdie * 4c72a1d60SRichard Purdie * Copyright 2005-2006 Openedhand Ltd. 5c72a1d60SRichard Purdie * 6c72a1d60SRichard Purdie * Author: Richard Purdie <rpurdie@openedhand.com> 7c72a1d60SRichard Purdie * 8c72a1d60SRichard Purdie * This program is free software; you can redistribute it and/or modify 9c72a1d60SRichard Purdie * it under the terms of the GNU General Public License version 2 as 10c72a1d60SRichard Purdie * published by the Free Software Foundation. 11c72a1d60SRichard Purdie * 12c72a1d60SRichard Purdie */ 13c72a1d60SRichard Purdie 14c72a1d60SRichard Purdie #include <linux/kernel.h> 1504713306SJacek Anaszewski #include <linux/leds.h> 16c72a1d60SRichard Purdie #include <linux/list.h> 17c72a1d60SRichard Purdie #include <linux/module.h> 1804713306SJacek Anaszewski #include <linux/mutex.h> 19*8e1f4561SKrzysztof Kozlowski #include <linux/of.h> 2072f8da32SRichard Purdie #include <linux/rwsem.h> 21*8e1f4561SKrzysztof Kozlowski #include <linux/slab.h> 22c72a1d60SRichard Purdie #include "leds.h" 23c72a1d60SRichard Purdie 2472f8da32SRichard Purdie DECLARE_RWSEM(leds_list_lock); 25c72a1d60SRichard Purdie EXPORT_SYMBOL_GPL(leds_list_lock); 264d404fd5SNémeth Márton 274d404fd5SNémeth Márton LIST_HEAD(leds_list); 284d404fd5SNémeth Márton EXPORT_SYMBOL_GPL(leds_list); 29a403d930SBryan Wu 30d4887af9SHeiner Kallweit static int __led_set_brightness(struct led_classdev *led_cdev, 31d4887af9SHeiner Kallweit enum led_brightness value) 32d4887af9SHeiner Kallweit { 33d4887af9SHeiner Kallweit if (!led_cdev->brightness_set) 34d4887af9SHeiner Kallweit return -ENOTSUPP; 35d4887af9SHeiner Kallweit 36d4887af9SHeiner Kallweit led_cdev->brightness_set(led_cdev, value); 37d4887af9SHeiner Kallweit 38d4887af9SHeiner Kallweit return 0; 39d4887af9SHeiner Kallweit } 40d4887af9SHeiner Kallweit 41d4887af9SHeiner Kallweit static int __led_set_brightness_blocking(struct led_classdev *led_cdev, 42d4887af9SHeiner Kallweit enum led_brightness value) 43d4887af9SHeiner Kallweit { 44d4887af9SHeiner Kallweit if (!led_cdev->brightness_set_blocking) 45d4887af9SHeiner Kallweit return -ENOTSUPP; 46d4887af9SHeiner Kallweit 47d4887af9SHeiner Kallweit return led_cdev->brightness_set_blocking(led_cdev, value); 48d4887af9SHeiner Kallweit } 49d4887af9SHeiner Kallweit 5049404665SKees Cook static void led_timer_function(struct timer_list *t) 51757b06aeSJacek Anaszewski { 5249404665SKees Cook struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer); 53757b06aeSJacek Anaszewski unsigned long brightness; 54757b06aeSJacek Anaszewski unsigned long delay; 55757b06aeSJacek Anaszewski 56757b06aeSJacek Anaszewski if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) { 5781fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, LED_OFF); 58a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 59757b06aeSJacek Anaszewski return; 60757b06aeSJacek Anaszewski } 61757b06aeSJacek Anaszewski 62a9c6ce57SHans de Goede if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP, 63a9c6ce57SHans de Goede &led_cdev->work_flags)) { 64a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 65757b06aeSJacek Anaszewski return; 66757b06aeSJacek Anaszewski } 67757b06aeSJacek Anaszewski 68757b06aeSJacek Anaszewski brightness = led_get_brightness(led_cdev); 69757b06aeSJacek Anaszewski if (!brightness) { 70757b06aeSJacek Anaszewski /* Time to switch the LED on. */ 71eb1610b4SHans de Goede if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE, 72eb1610b4SHans de Goede &led_cdev->work_flags)) 73eb1610b4SHans de Goede brightness = led_cdev->new_blink_brightness; 74eb1610b4SHans de Goede else 75757b06aeSJacek Anaszewski brightness = led_cdev->blink_brightness; 76757b06aeSJacek Anaszewski delay = led_cdev->blink_delay_on; 77757b06aeSJacek Anaszewski } else { 78757b06aeSJacek Anaszewski /* Store the current brightness value to be able 79757b06aeSJacek Anaszewski * to restore it when the delay_off period is over. 80757b06aeSJacek Anaszewski */ 81757b06aeSJacek Anaszewski led_cdev->blink_brightness = brightness; 82757b06aeSJacek Anaszewski brightness = LED_OFF; 83757b06aeSJacek Anaszewski delay = led_cdev->blink_delay_off; 84757b06aeSJacek Anaszewski } 85757b06aeSJacek Anaszewski 8681fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, brightness); 87757b06aeSJacek Anaszewski 88757b06aeSJacek Anaszewski /* Return in next iteration if led is in one-shot mode and we are in 89757b06aeSJacek Anaszewski * the final blink state so that the led is toggled each delay_on + 90757b06aeSJacek Anaszewski * delay_off milliseconds in worst case. 91757b06aeSJacek Anaszewski */ 92a9c6ce57SHans de Goede if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) { 93a9c6ce57SHans de Goede if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) { 94757b06aeSJacek Anaszewski if (brightness) 95a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT_STOP, 96a9c6ce57SHans de Goede &led_cdev->work_flags); 97757b06aeSJacek Anaszewski } else { 98757b06aeSJacek Anaszewski if (!brightness) 99a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT_STOP, 100a9c6ce57SHans de Goede &led_cdev->work_flags); 101757b06aeSJacek Anaszewski } 102757b06aeSJacek Anaszewski } 103757b06aeSJacek Anaszewski 104757b06aeSJacek Anaszewski mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay)); 105757b06aeSJacek Anaszewski } 106757b06aeSJacek Anaszewski 107757b06aeSJacek Anaszewski static void set_brightness_delayed(struct work_struct *ws) 108757b06aeSJacek Anaszewski { 109757b06aeSJacek Anaszewski struct led_classdev *led_cdev = 110757b06aeSJacek Anaszewski container_of(ws, struct led_classdev, set_brightness_work); 1111afcadfcSJacek Anaszewski int ret = 0; 112757b06aeSJacek Anaszewski 113a9c6ce57SHans de Goede if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) { 114f1e80c07SJacek Anaszewski led_cdev->delayed_set_value = LED_OFF; 115757b06aeSJacek Anaszewski led_stop_software_blink(led_cdev); 116f1e80c07SJacek Anaszewski } 117757b06aeSJacek Anaszewski 118d4887af9SHeiner Kallweit ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value); 119d4887af9SHeiner Kallweit if (ret == -ENOTSUPP) 120d4887af9SHeiner Kallweit ret = __led_set_brightness_blocking(led_cdev, 1211afcadfcSJacek Anaszewski led_cdev->delayed_set_value); 122d84d80f3SHeiner Kallweit if (ret < 0 && 123d84d80f3SHeiner Kallweit /* LED HW might have been unplugged, therefore don't warn */ 124d84d80f3SHeiner Kallweit !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) && 125d84d80f3SHeiner Kallweit (led_cdev->flags & LED_HW_PLUGGABLE))) 1261afcadfcSJacek Anaszewski dev_err(led_cdev->dev, 1271afcadfcSJacek Anaszewski "Setting an LED's brightness failed (%d)\n", ret); 128757b06aeSJacek Anaszewski } 129757b06aeSJacek Anaszewski 130a403d930SBryan Wu static void led_set_software_blink(struct led_classdev *led_cdev, 131a403d930SBryan Wu unsigned long delay_on, 132a403d930SBryan Wu unsigned long delay_off) 133a403d930SBryan Wu { 134a403d930SBryan Wu int current_brightness; 135a403d930SBryan Wu 136a403d930SBryan Wu current_brightness = led_get_brightness(led_cdev); 137a403d930SBryan Wu if (current_brightness) 138a403d930SBryan Wu led_cdev->blink_brightness = current_brightness; 139a403d930SBryan Wu if (!led_cdev->blink_brightness) 140a403d930SBryan Wu led_cdev->blink_brightness = led_cdev->max_brightness; 141a403d930SBryan Wu 142a403d930SBryan Wu led_cdev->blink_delay_on = delay_on; 143a403d930SBryan Wu led_cdev->blink_delay_off = delay_off; 144a403d930SBryan Wu 1458d82fef8SStefan Sørensen /* never on - just set to off */ 1468d82fef8SStefan Sørensen if (!delay_on) { 14781fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, LED_OFF); 148a403d930SBryan Wu return; 1498d82fef8SStefan Sørensen } 150a403d930SBryan Wu 151a403d930SBryan Wu /* never off - just set to brightness */ 152a403d930SBryan Wu if (!delay_off) { 15381fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, 15481fe8e5bSJacek Anaszewski led_cdev->blink_brightness); 155a403d930SBryan Wu return; 156a403d930SBryan Wu } 157a403d930SBryan Wu 158a9c6ce57SHans de Goede set_bit(LED_BLINK_SW, &led_cdev->work_flags); 1599067359fSJiri Kosina mod_timer(&led_cdev->blink_timer, jiffies + 1); 160a403d930SBryan Wu } 161a403d930SBryan Wu 162a403d930SBryan Wu 16320c0e6b8SBryan Wu static void led_blink_setup(struct led_classdev *led_cdev, 164a403d930SBryan Wu unsigned long *delay_on, 165a403d930SBryan Wu unsigned long *delay_off) 166a403d930SBryan Wu { 167a9c6ce57SHans de Goede if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) && 1685bb629c5SFabio Baltieri led_cdev->blink_set && 169a403d930SBryan Wu !led_cdev->blink_set(led_cdev, delay_on, delay_off)) 170a403d930SBryan Wu return; 171a403d930SBryan Wu 172a403d930SBryan Wu /* blink with 1 Hz as default if nothing specified */ 173a403d930SBryan Wu if (!*delay_on && !*delay_off) 174a403d930SBryan Wu *delay_on = *delay_off = 500; 175a403d930SBryan Wu 176a403d930SBryan Wu led_set_software_blink(led_cdev, *delay_on, *delay_off); 177a403d930SBryan Wu } 1785bb629c5SFabio Baltieri 179757b06aeSJacek Anaszewski void led_init_core(struct led_classdev *led_cdev) 180757b06aeSJacek Anaszewski { 181757b06aeSJacek Anaszewski INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed); 182757b06aeSJacek Anaszewski 18349404665SKees Cook timer_setup(&led_cdev->blink_timer, led_timer_function, 0); 184757b06aeSJacek Anaszewski } 185757b06aeSJacek Anaszewski EXPORT_SYMBOL_GPL(led_init_core); 186757b06aeSJacek Anaszewski 1875bb629c5SFabio Baltieri void led_blink_set(struct led_classdev *led_cdev, 1885bb629c5SFabio Baltieri unsigned long *delay_on, 1895bb629c5SFabio Baltieri unsigned long *delay_off) 1905bb629c5SFabio Baltieri { 1917b6af2c5SJacek Anaszewski del_timer_sync(&led_cdev->blink_timer); 1925bb629c5SFabio Baltieri 1937b6af2c5SJacek Anaszewski clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 194a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags); 195a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags); 1965bb629c5SFabio Baltieri 1975bb629c5SFabio Baltieri led_blink_setup(led_cdev, delay_on, delay_off); 1985bb629c5SFabio Baltieri } 1992806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_blink_set); 200a403d930SBryan Wu 2015bb629c5SFabio Baltieri void led_blink_set_oneshot(struct led_classdev *led_cdev, 2025bb629c5SFabio Baltieri unsigned long *delay_on, 2035bb629c5SFabio Baltieri unsigned long *delay_off, 2045bb629c5SFabio Baltieri int invert) 2055bb629c5SFabio Baltieri { 206a9c6ce57SHans de Goede if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) && 2079067359fSJiri Kosina timer_pending(&led_cdev->blink_timer)) 2085bb629c5SFabio Baltieri return; 2095bb629c5SFabio Baltieri 210a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags); 211a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags); 2125bb629c5SFabio Baltieri 2135bb629c5SFabio Baltieri if (invert) 214a9c6ce57SHans de Goede set_bit(LED_BLINK_INVERT, &led_cdev->work_flags); 2155bb629c5SFabio Baltieri else 216a9c6ce57SHans de Goede clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags); 2175bb629c5SFabio Baltieri 2185bb629c5SFabio Baltieri led_blink_setup(led_cdev, delay_on, delay_off); 2195bb629c5SFabio Baltieri } 2202806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_blink_set_oneshot); 2215bb629c5SFabio Baltieri 222d23a22a7SFabio Baltieri void led_stop_software_blink(struct led_classdev *led_cdev) 223a403d930SBryan Wu { 2249067359fSJiri Kosina del_timer_sync(&led_cdev->blink_timer); 22543786482SFabio Baltieri led_cdev->blink_delay_on = 0; 22643786482SFabio Baltieri led_cdev->blink_delay_off = 0; 227a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 228d23a22a7SFabio Baltieri } 229d23a22a7SFabio Baltieri EXPORT_SYMBOL_GPL(led_stop_software_blink); 230d23a22a7SFabio Baltieri 231d23a22a7SFabio Baltieri void led_set_brightness(struct led_classdev *led_cdev, 232d23a22a7SFabio Baltieri enum led_brightness brightness) 233d23a22a7SFabio Baltieri { 234f1e80c07SJacek Anaszewski /* 2357cfe749fSTony Makkiel * If software blink is active, delay brightness setting 236f1e80c07SJacek Anaszewski * until the next timer tick. 237f1e80c07SJacek Anaszewski */ 238a9c6ce57SHans de Goede if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) { 239f1e80c07SJacek Anaszewski /* 240f1e80c07SJacek Anaszewski * If we need to disable soft blinking delegate this to the 241f1e80c07SJacek Anaszewski * work queue task to avoid problems in case we are called 242f1e80c07SJacek Anaszewski * from hard irq context. 243f1e80c07SJacek Anaszewski */ 244f1e80c07SJacek Anaszewski if (brightness == LED_OFF) { 245a9c6ce57SHans de Goede set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags); 246d23a22a7SFabio Baltieri schedule_work(&led_cdev->set_brightness_work); 247f1e80c07SJacek Anaszewski } else { 248a9c6ce57SHans de Goede set_bit(LED_BLINK_BRIGHTNESS_CHANGE, 249a9c6ce57SHans de Goede &led_cdev->work_flags); 250eb1610b4SHans de Goede led_cdev->new_blink_brightness = brightness; 251f1e80c07SJacek Anaszewski } 252d23a22a7SFabio Baltieri return; 253d23a22a7SFabio Baltieri } 25443786482SFabio Baltieri 25581fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, brightness); 256a403d930SBryan Wu } 2572806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness); 2583ef7de53SJacek Anaszewski 25981fe8e5bSJacek Anaszewski void led_set_brightness_nopm(struct led_classdev *led_cdev, 26081fe8e5bSJacek Anaszewski enum led_brightness value) 26181fe8e5bSJacek Anaszewski { 26281fe8e5bSJacek Anaszewski /* Use brightness_set op if available, it is guaranteed not to sleep */ 263d4887af9SHeiner Kallweit if (!__led_set_brightness(led_cdev, value)) 26481fe8e5bSJacek Anaszewski return; 26581fe8e5bSJacek Anaszewski 26681fe8e5bSJacek Anaszewski /* If brightness setting can sleep, delegate it to a work queue task */ 26781fe8e5bSJacek Anaszewski led_cdev->delayed_set_value = value; 26881fe8e5bSJacek Anaszewski schedule_work(&led_cdev->set_brightness_work); 26981fe8e5bSJacek Anaszewski } 27081fe8e5bSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_nopm); 27181fe8e5bSJacek Anaszewski 27281fe8e5bSJacek Anaszewski void led_set_brightness_nosleep(struct led_classdev *led_cdev, 27381fe8e5bSJacek Anaszewski enum led_brightness value) 27481fe8e5bSJacek Anaszewski { 27581fe8e5bSJacek Anaszewski led_cdev->brightness = min(value, led_cdev->max_brightness); 27681fe8e5bSJacek Anaszewski 27781fe8e5bSJacek Anaszewski if (led_cdev->flags & LED_SUSPENDED) 27881fe8e5bSJacek Anaszewski return; 27981fe8e5bSJacek Anaszewski 28081fe8e5bSJacek Anaszewski led_set_brightness_nopm(led_cdev, led_cdev->brightness); 28181fe8e5bSJacek Anaszewski } 28281fe8e5bSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_nosleep); 28381fe8e5bSJacek Anaszewski 28413ae79bbSJacek Anaszewski int led_set_brightness_sync(struct led_classdev *led_cdev, 28513ae79bbSJacek Anaszewski enum led_brightness value) 28613ae79bbSJacek Anaszewski { 28713ae79bbSJacek Anaszewski if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) 28813ae79bbSJacek Anaszewski return -EBUSY; 28913ae79bbSJacek Anaszewski 29013ae79bbSJacek Anaszewski led_cdev->brightness = min(value, led_cdev->max_brightness); 29113ae79bbSJacek Anaszewski 29213ae79bbSJacek Anaszewski if (led_cdev->flags & LED_SUSPENDED) 29313ae79bbSJacek Anaszewski return 0; 29413ae79bbSJacek Anaszewski 295d4887af9SHeiner Kallweit return __led_set_brightness_blocking(led_cdev, led_cdev->brightness); 29613ae79bbSJacek Anaszewski } 29713ae79bbSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_sync); 29813ae79bbSJacek Anaszewski 2993ef7de53SJacek Anaszewski int led_update_brightness(struct led_classdev *led_cdev) 3003ef7de53SJacek Anaszewski { 3013ef7de53SJacek Anaszewski int ret = 0; 3023ef7de53SJacek Anaszewski 3033ef7de53SJacek Anaszewski if (led_cdev->brightness_get) { 3043ef7de53SJacek Anaszewski ret = led_cdev->brightness_get(led_cdev); 3053ef7de53SJacek Anaszewski if (ret >= 0) { 3063ef7de53SJacek Anaszewski led_cdev->brightness = ret; 3073ef7de53SJacek Anaszewski return 0; 3083ef7de53SJacek Anaszewski } 3093ef7de53SJacek Anaszewski } 3103ef7de53SJacek Anaszewski 3113ef7de53SJacek Anaszewski return ret; 3123ef7de53SJacek Anaszewski } 3132806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_update_brightness); 314acd899e4SJacek Anaszewski 315*8e1f4561SKrzysztof Kozlowski u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size) 316*8e1f4561SKrzysztof Kozlowski { 317*8e1f4561SKrzysztof Kozlowski struct device_node *np = dev_of_node(led_cdev->dev); 318*8e1f4561SKrzysztof Kozlowski u32 *pattern; 319*8e1f4561SKrzysztof Kozlowski int count; 320*8e1f4561SKrzysztof Kozlowski 321*8e1f4561SKrzysztof Kozlowski if (!np) 322*8e1f4561SKrzysztof Kozlowski return NULL; 323*8e1f4561SKrzysztof Kozlowski 324*8e1f4561SKrzysztof Kozlowski count = of_property_count_u32_elems(np, "led-pattern"); 325*8e1f4561SKrzysztof Kozlowski if (count < 0) 326*8e1f4561SKrzysztof Kozlowski return NULL; 327*8e1f4561SKrzysztof Kozlowski 328*8e1f4561SKrzysztof Kozlowski pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL); 329*8e1f4561SKrzysztof Kozlowski if (!pattern) 330*8e1f4561SKrzysztof Kozlowski return NULL; 331*8e1f4561SKrzysztof Kozlowski 332*8e1f4561SKrzysztof Kozlowski if (of_property_read_u32_array(np, "led-pattern", pattern, count)) { 333*8e1f4561SKrzysztof Kozlowski kfree(pattern); 334*8e1f4561SKrzysztof Kozlowski return NULL; 335*8e1f4561SKrzysztof Kozlowski } 336*8e1f4561SKrzysztof Kozlowski 337*8e1f4561SKrzysztof Kozlowski *size = count; 338*8e1f4561SKrzysztof Kozlowski 339*8e1f4561SKrzysztof Kozlowski return pattern; 340*8e1f4561SKrzysztof Kozlowski } 341*8e1f4561SKrzysztof Kozlowski EXPORT_SYMBOL_GPL(led_get_default_pattern); 342*8e1f4561SKrzysztof Kozlowski 343acd899e4SJacek Anaszewski /* Caller must ensure led_cdev->led_access held */ 344acd899e4SJacek Anaszewski void led_sysfs_disable(struct led_classdev *led_cdev) 345acd899e4SJacek Anaszewski { 346acd899e4SJacek Anaszewski lockdep_assert_held(&led_cdev->led_access); 347acd899e4SJacek Anaszewski 348acd899e4SJacek Anaszewski led_cdev->flags |= LED_SYSFS_DISABLE; 349acd899e4SJacek Anaszewski } 350acd899e4SJacek Anaszewski EXPORT_SYMBOL_GPL(led_sysfs_disable); 351acd899e4SJacek Anaszewski 352acd899e4SJacek Anaszewski /* Caller must ensure led_cdev->led_access held */ 353acd899e4SJacek Anaszewski void led_sysfs_enable(struct led_classdev *led_cdev) 354acd899e4SJacek Anaszewski { 355acd899e4SJacek Anaszewski lockdep_assert_held(&led_cdev->led_access); 356acd899e4SJacek Anaszewski 357acd899e4SJacek Anaszewski led_cdev->flags &= ~LED_SYSFS_DISABLE; 358acd899e4SJacek Anaszewski } 359acd899e4SJacek Anaszewski EXPORT_SYMBOL_GPL(led_sysfs_enable); 360