1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2c72a1d60SRichard Purdie /* 3c72a1d60SRichard Purdie * LED Class Core 4c72a1d60SRichard Purdie * 5c72a1d60SRichard Purdie * Copyright 2005-2006 Openedhand Ltd. 6c72a1d60SRichard Purdie * 7c72a1d60SRichard Purdie * Author: Richard Purdie <rpurdie@openedhand.com> 8c72a1d60SRichard Purdie */ 9c72a1d60SRichard Purdie 10c72a1d60SRichard Purdie #include <linux/kernel.h> 1104713306SJacek Anaszewski #include <linux/leds.h> 12c72a1d60SRichard Purdie #include <linux/list.h> 13c72a1d60SRichard Purdie #include <linux/module.h> 1404713306SJacek Anaszewski #include <linux/mutex.h> 158e1f4561SKrzysztof Kozlowski #include <linux/of.h> 16bb4e9af0SJacek Anaszewski #include <linux/property.h> 1772f8da32SRichard Purdie #include <linux/rwsem.h> 188e1f4561SKrzysztof Kozlowski #include <linux/slab.h> 19bb4e9af0SJacek Anaszewski #include <uapi/linux/uleds.h> 20c72a1d60SRichard Purdie #include "leds.h" 21c72a1d60SRichard Purdie 2272f8da32SRichard Purdie DECLARE_RWSEM(leds_list_lock); 23c72a1d60SRichard Purdie EXPORT_SYMBOL_GPL(leds_list_lock); 244d404fd5SNémeth Márton 254d404fd5SNémeth Márton LIST_HEAD(leds_list); 264d404fd5SNémeth Márton EXPORT_SYMBOL_GPL(leds_list); 27a403d930SBryan Wu 28bb4e9af0SJacek Anaszewski const char * const led_colors[LED_COLOR_ID_MAX] = { 29bb4e9af0SJacek Anaszewski [LED_COLOR_ID_WHITE] = "white", 30bb4e9af0SJacek Anaszewski [LED_COLOR_ID_RED] = "red", 31bb4e9af0SJacek Anaszewski [LED_COLOR_ID_GREEN] = "green", 32bb4e9af0SJacek Anaszewski [LED_COLOR_ID_BLUE] = "blue", 33bb4e9af0SJacek Anaszewski [LED_COLOR_ID_AMBER] = "amber", 34bb4e9af0SJacek Anaszewski [LED_COLOR_ID_VIOLET] = "violet", 35bb4e9af0SJacek Anaszewski [LED_COLOR_ID_YELLOW] = "yellow", 36bb4e9af0SJacek Anaszewski [LED_COLOR_ID_IR] = "ir", 3710d3e0d8SDan Murphy [LED_COLOR_ID_MULTI] = "multicolor", 3854212f5aSPavel Machek [LED_COLOR_ID_RGB] = "rgb", 39bb4e9af0SJacek Anaszewski }; 40bb4e9af0SJacek Anaszewski EXPORT_SYMBOL_GPL(led_colors); 41bb4e9af0SJacek Anaszewski 42af0bfab9SAbanoub Sameh static int __led_set_brightness(struct led_classdev *led_cdev, unsigned int value) 43d4887af9SHeiner Kallweit { 44d4887af9SHeiner Kallweit if (!led_cdev->brightness_set) 45d4887af9SHeiner Kallweit return -ENOTSUPP; 46d4887af9SHeiner Kallweit 47d4887af9SHeiner Kallweit led_cdev->brightness_set(led_cdev, value); 48d4887af9SHeiner Kallweit 49d4887af9SHeiner Kallweit return 0; 50d4887af9SHeiner Kallweit } 51d4887af9SHeiner Kallweit 52af0bfab9SAbanoub Sameh static int __led_set_brightness_blocking(struct led_classdev *led_cdev, unsigned int value) 53d4887af9SHeiner Kallweit { 54d4887af9SHeiner Kallweit if (!led_cdev->brightness_set_blocking) 55d4887af9SHeiner Kallweit return -ENOTSUPP; 56d4887af9SHeiner Kallweit 57d4887af9SHeiner Kallweit return led_cdev->brightness_set_blocking(led_cdev, value); 58d4887af9SHeiner Kallweit } 59d4887af9SHeiner Kallweit 6049404665SKees Cook static void led_timer_function(struct timer_list *t) 61757b06aeSJacek Anaszewski { 6249404665SKees Cook struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer); 63757b06aeSJacek Anaszewski unsigned long brightness; 64757b06aeSJacek Anaszewski unsigned long delay; 65757b06aeSJacek Anaszewski 66757b06aeSJacek Anaszewski if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) { 6781fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, LED_OFF); 68a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 69757b06aeSJacek Anaszewski return; 70757b06aeSJacek Anaszewski } 71757b06aeSJacek Anaszewski 72a9c6ce57SHans de Goede if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP, 73a9c6ce57SHans de Goede &led_cdev->work_flags)) { 74a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 75757b06aeSJacek Anaszewski return; 76757b06aeSJacek Anaszewski } 77757b06aeSJacek Anaszewski 78757b06aeSJacek Anaszewski brightness = led_get_brightness(led_cdev); 79757b06aeSJacek Anaszewski if (!brightness) { 80757b06aeSJacek Anaszewski /* Time to switch the LED on. */ 81eb1610b4SHans de Goede if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE, 82eb1610b4SHans de Goede &led_cdev->work_flags)) 83eb1610b4SHans de Goede brightness = led_cdev->new_blink_brightness; 84eb1610b4SHans de Goede else 85757b06aeSJacek Anaszewski brightness = led_cdev->blink_brightness; 86757b06aeSJacek Anaszewski delay = led_cdev->blink_delay_on; 87757b06aeSJacek Anaszewski } else { 88757b06aeSJacek Anaszewski /* Store the current brightness value to be able 89757b06aeSJacek Anaszewski * to restore it when the delay_off period is over. 90757b06aeSJacek Anaszewski */ 91757b06aeSJacek Anaszewski led_cdev->blink_brightness = brightness; 92757b06aeSJacek Anaszewski brightness = LED_OFF; 93757b06aeSJacek Anaszewski delay = led_cdev->blink_delay_off; 94757b06aeSJacek Anaszewski } 95757b06aeSJacek Anaszewski 9681fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, brightness); 97757b06aeSJacek Anaszewski 98757b06aeSJacek Anaszewski /* Return in next iteration if led is in one-shot mode and we are in 99757b06aeSJacek Anaszewski * the final blink state so that the led is toggled each delay_on + 100757b06aeSJacek Anaszewski * delay_off milliseconds in worst case. 101757b06aeSJacek Anaszewski */ 102a9c6ce57SHans de Goede if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) { 103a9c6ce57SHans de Goede if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) { 104757b06aeSJacek Anaszewski if (brightness) 105a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT_STOP, 106a9c6ce57SHans de Goede &led_cdev->work_flags); 107757b06aeSJacek Anaszewski } else { 108757b06aeSJacek Anaszewski if (!brightness) 109a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT_STOP, 110a9c6ce57SHans de Goede &led_cdev->work_flags); 111757b06aeSJacek Anaszewski } 112757b06aeSJacek Anaszewski } 113757b06aeSJacek Anaszewski 114757b06aeSJacek Anaszewski mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay)); 115757b06aeSJacek Anaszewski } 116757b06aeSJacek Anaszewski 117*fa15d8c6SHans de Goede static void set_brightness_delayed_set_brightness(struct led_classdev *led_cdev, 118*fa15d8c6SHans de Goede unsigned int value) 119757b06aeSJacek Anaszewski { 1201afcadfcSJacek Anaszewski int ret = 0; 121757b06aeSJacek Anaszewski 122*fa15d8c6SHans de Goede ret = __led_set_brightness(led_cdev, value); 123d4887af9SHeiner Kallweit if (ret == -ENOTSUPP) 124*fa15d8c6SHans de Goede ret = __led_set_brightness_blocking(led_cdev, value); 125d84d80f3SHeiner Kallweit if (ret < 0 && 126d84d80f3SHeiner Kallweit /* LED HW might have been unplugged, therefore don't warn */ 127d84d80f3SHeiner Kallweit !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) && 128d84d80f3SHeiner Kallweit (led_cdev->flags & LED_HW_PLUGGABLE))) 1291afcadfcSJacek Anaszewski dev_err(led_cdev->dev, 1301afcadfcSJacek Anaszewski "Setting an LED's brightness failed (%d)\n", ret); 131757b06aeSJacek Anaszewski } 132757b06aeSJacek Anaszewski 133*fa15d8c6SHans de Goede static void set_brightness_delayed(struct work_struct *ws) 134*fa15d8c6SHans de Goede { 135*fa15d8c6SHans de Goede struct led_classdev *led_cdev = 136*fa15d8c6SHans de Goede container_of(ws, struct led_classdev, set_brightness_work); 137*fa15d8c6SHans de Goede 138*fa15d8c6SHans de Goede if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) { 139*fa15d8c6SHans de Goede led_stop_software_blink(led_cdev); 140*fa15d8c6SHans de Goede set_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags); 141*fa15d8c6SHans de Goede } 142*fa15d8c6SHans de Goede 143*fa15d8c6SHans de Goede /* 144*fa15d8c6SHans de Goede * Triggers may call led_set_brightness(LED_OFF), 145*fa15d8c6SHans de Goede * led_set_brightness(LED_FULL) in quick succession to disable blinking 146*fa15d8c6SHans de Goede * and turn the LED on. Both actions may have been scheduled to run 147*fa15d8c6SHans de Goede * before this work item runs once. To make sure this works properly 148*fa15d8c6SHans de Goede * handle LED_SET_BRIGHTNESS_OFF first. 149*fa15d8c6SHans de Goede */ 150*fa15d8c6SHans de Goede if (test_and_clear_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags)) 151*fa15d8c6SHans de Goede set_brightness_delayed_set_brightness(led_cdev, LED_OFF); 152*fa15d8c6SHans de Goede 153*fa15d8c6SHans de Goede if (test_and_clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags)) 154*fa15d8c6SHans de Goede set_brightness_delayed_set_brightness(led_cdev, led_cdev->delayed_set_value); 155*fa15d8c6SHans de Goede } 156*fa15d8c6SHans de Goede 157a403d930SBryan Wu static void led_set_software_blink(struct led_classdev *led_cdev, 158a403d930SBryan Wu unsigned long delay_on, 159a403d930SBryan Wu unsigned long delay_off) 160a403d930SBryan Wu { 161a403d930SBryan Wu int current_brightness; 162a403d930SBryan Wu 163a403d930SBryan Wu current_brightness = led_get_brightness(led_cdev); 164a403d930SBryan Wu if (current_brightness) 165a403d930SBryan Wu led_cdev->blink_brightness = current_brightness; 166a403d930SBryan Wu if (!led_cdev->blink_brightness) 167a403d930SBryan Wu led_cdev->blink_brightness = led_cdev->max_brightness; 168a403d930SBryan Wu 169a403d930SBryan Wu led_cdev->blink_delay_on = delay_on; 170a403d930SBryan Wu led_cdev->blink_delay_off = delay_off; 171a403d930SBryan Wu 1728d82fef8SStefan Sørensen /* never on - just set to off */ 1738d82fef8SStefan Sørensen if (!delay_on) { 17481fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, LED_OFF); 175a403d930SBryan Wu return; 1768d82fef8SStefan Sørensen } 177a403d930SBryan Wu 178a403d930SBryan Wu /* never off - just set to brightness */ 179a403d930SBryan Wu if (!delay_off) { 18081fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, 18181fe8e5bSJacek Anaszewski led_cdev->blink_brightness); 182a403d930SBryan Wu return; 183a403d930SBryan Wu } 184a403d930SBryan Wu 185a9c6ce57SHans de Goede set_bit(LED_BLINK_SW, &led_cdev->work_flags); 1869067359fSJiri Kosina mod_timer(&led_cdev->blink_timer, jiffies + 1); 187a403d930SBryan Wu } 188a403d930SBryan Wu 189a403d930SBryan Wu 19020c0e6b8SBryan Wu static void led_blink_setup(struct led_classdev *led_cdev, 191a403d930SBryan Wu unsigned long *delay_on, 192a403d930SBryan Wu unsigned long *delay_off) 193a403d930SBryan Wu { 194a9c6ce57SHans de Goede if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) && 1955bb629c5SFabio Baltieri led_cdev->blink_set && 196a403d930SBryan Wu !led_cdev->blink_set(led_cdev, delay_on, delay_off)) 197a403d930SBryan Wu return; 198a403d930SBryan Wu 199a403d930SBryan Wu /* blink with 1 Hz as default if nothing specified */ 200a403d930SBryan Wu if (!*delay_on && !*delay_off) 201a403d930SBryan Wu *delay_on = *delay_off = 500; 202a403d930SBryan Wu 203a403d930SBryan Wu led_set_software_blink(led_cdev, *delay_on, *delay_off); 204a403d930SBryan Wu } 2055bb629c5SFabio Baltieri 206757b06aeSJacek Anaszewski void led_init_core(struct led_classdev *led_cdev) 207757b06aeSJacek Anaszewski { 208757b06aeSJacek Anaszewski INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed); 209757b06aeSJacek Anaszewski 21049404665SKees Cook timer_setup(&led_cdev->blink_timer, led_timer_function, 0); 211757b06aeSJacek Anaszewski } 212757b06aeSJacek Anaszewski EXPORT_SYMBOL_GPL(led_init_core); 213757b06aeSJacek Anaszewski 2145bb629c5SFabio Baltieri void led_blink_set(struct led_classdev *led_cdev, 2155bb629c5SFabio Baltieri unsigned long *delay_on, 2165bb629c5SFabio Baltieri unsigned long *delay_off) 2175bb629c5SFabio Baltieri { 2187b6af2c5SJacek Anaszewski del_timer_sync(&led_cdev->blink_timer); 2195bb629c5SFabio Baltieri 2207b6af2c5SJacek Anaszewski clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 221a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags); 222a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags); 2235bb629c5SFabio Baltieri 2245bb629c5SFabio Baltieri led_blink_setup(led_cdev, delay_on, delay_off); 2255bb629c5SFabio Baltieri } 2262806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_blink_set); 227a403d930SBryan Wu 2285bb629c5SFabio Baltieri void led_blink_set_oneshot(struct led_classdev *led_cdev, 2295bb629c5SFabio Baltieri unsigned long *delay_on, 2305bb629c5SFabio Baltieri unsigned long *delay_off, 2315bb629c5SFabio Baltieri int invert) 2325bb629c5SFabio Baltieri { 233a9c6ce57SHans de Goede if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) && 2349067359fSJiri Kosina timer_pending(&led_cdev->blink_timer)) 2355bb629c5SFabio Baltieri return; 2365bb629c5SFabio Baltieri 237a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags); 238a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags); 2395bb629c5SFabio Baltieri 2405bb629c5SFabio Baltieri if (invert) 241a9c6ce57SHans de Goede set_bit(LED_BLINK_INVERT, &led_cdev->work_flags); 2425bb629c5SFabio Baltieri else 243a9c6ce57SHans de Goede clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags); 2445bb629c5SFabio Baltieri 2455bb629c5SFabio Baltieri led_blink_setup(led_cdev, delay_on, delay_off); 2465bb629c5SFabio Baltieri } 2472806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_blink_set_oneshot); 2485bb629c5SFabio Baltieri 249d23a22a7SFabio Baltieri void led_stop_software_blink(struct led_classdev *led_cdev) 250a403d930SBryan Wu { 2519067359fSJiri Kosina del_timer_sync(&led_cdev->blink_timer); 25243786482SFabio Baltieri led_cdev->blink_delay_on = 0; 25343786482SFabio Baltieri led_cdev->blink_delay_off = 0; 254a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 255d23a22a7SFabio Baltieri } 256d23a22a7SFabio Baltieri EXPORT_SYMBOL_GPL(led_stop_software_blink); 257d23a22a7SFabio Baltieri 258af0bfab9SAbanoub Sameh void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness) 259d23a22a7SFabio Baltieri { 260f1e80c07SJacek Anaszewski /* 2617cfe749fSTony Makkiel * If software blink is active, delay brightness setting 262f1e80c07SJacek Anaszewski * until the next timer tick. 263f1e80c07SJacek Anaszewski */ 264a9c6ce57SHans de Goede if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) { 265f1e80c07SJacek Anaszewski /* 266f1e80c07SJacek Anaszewski * If we need to disable soft blinking delegate this to the 267f1e80c07SJacek Anaszewski * work queue task to avoid problems in case we are called 268f1e80c07SJacek Anaszewski * from hard irq context. 269f1e80c07SJacek Anaszewski */ 270af0bfab9SAbanoub Sameh if (!brightness) { 271a9c6ce57SHans de Goede set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags); 272d23a22a7SFabio Baltieri schedule_work(&led_cdev->set_brightness_work); 273f1e80c07SJacek Anaszewski } else { 274a9c6ce57SHans de Goede set_bit(LED_BLINK_BRIGHTNESS_CHANGE, 275a9c6ce57SHans de Goede &led_cdev->work_flags); 276eb1610b4SHans de Goede led_cdev->new_blink_brightness = brightness; 277f1e80c07SJacek Anaszewski } 278d23a22a7SFabio Baltieri return; 279d23a22a7SFabio Baltieri } 28043786482SFabio Baltieri 28181fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, brightness); 282a403d930SBryan Wu } 2832806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness); 2843ef7de53SJacek Anaszewski 285af0bfab9SAbanoub Sameh void led_set_brightness_nopm(struct led_classdev *led_cdev, unsigned int value) 28681fe8e5bSJacek Anaszewski { 28781fe8e5bSJacek Anaszewski /* Use brightness_set op if available, it is guaranteed not to sleep */ 288d4887af9SHeiner Kallweit if (!__led_set_brightness(led_cdev, value)) 28981fe8e5bSJacek Anaszewski return; 29081fe8e5bSJacek Anaszewski 291*fa15d8c6SHans de Goede /* 292*fa15d8c6SHans de Goede * Brightness setting can sleep, delegate it to a work queue task. 293*fa15d8c6SHans de Goede * value 0 / LED_OFF is special, since it also disables hw-blinking 294*fa15d8c6SHans de Goede * (sw-blink disable is handled in led_set_brightness()). 295*fa15d8c6SHans de Goede * To avoid a hw-blink-disable getting lost when a second brightness 296*fa15d8c6SHans de Goede * change is done immediately afterwards (before the work runs), 297*fa15d8c6SHans de Goede * it uses a separate work_flag. 298*fa15d8c6SHans de Goede */ 299*fa15d8c6SHans de Goede if (value) { 30081fe8e5bSJacek Anaszewski led_cdev->delayed_set_value = value; 301*fa15d8c6SHans de Goede set_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags); 302*fa15d8c6SHans de Goede } else { 303*fa15d8c6SHans de Goede clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags); 304*fa15d8c6SHans de Goede set_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags); 305*fa15d8c6SHans de Goede } 306*fa15d8c6SHans de Goede 30781fe8e5bSJacek Anaszewski schedule_work(&led_cdev->set_brightness_work); 30881fe8e5bSJacek Anaszewski } 30981fe8e5bSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_nopm); 31081fe8e5bSJacek Anaszewski 311af0bfab9SAbanoub Sameh void led_set_brightness_nosleep(struct led_classdev *led_cdev, unsigned int value) 31281fe8e5bSJacek Anaszewski { 31381fe8e5bSJacek Anaszewski led_cdev->brightness = min(value, led_cdev->max_brightness); 31481fe8e5bSJacek Anaszewski 31581fe8e5bSJacek Anaszewski if (led_cdev->flags & LED_SUSPENDED) 31681fe8e5bSJacek Anaszewski return; 31781fe8e5bSJacek Anaszewski 31881fe8e5bSJacek Anaszewski led_set_brightness_nopm(led_cdev, led_cdev->brightness); 31981fe8e5bSJacek Anaszewski } 32081fe8e5bSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_nosleep); 32181fe8e5bSJacek Anaszewski 322af0bfab9SAbanoub Sameh int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value) 32313ae79bbSJacek Anaszewski { 32413ae79bbSJacek Anaszewski if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) 32513ae79bbSJacek Anaszewski return -EBUSY; 32613ae79bbSJacek Anaszewski 32713ae79bbSJacek Anaszewski led_cdev->brightness = min(value, led_cdev->max_brightness); 32813ae79bbSJacek Anaszewski 32913ae79bbSJacek Anaszewski if (led_cdev->flags & LED_SUSPENDED) 33013ae79bbSJacek Anaszewski return 0; 33113ae79bbSJacek Anaszewski 332d4887af9SHeiner Kallweit return __led_set_brightness_blocking(led_cdev, led_cdev->brightness); 33313ae79bbSJacek Anaszewski } 33413ae79bbSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_sync); 33513ae79bbSJacek Anaszewski 3363ef7de53SJacek Anaszewski int led_update_brightness(struct led_classdev *led_cdev) 3373ef7de53SJacek Anaszewski { 3383ef7de53SJacek Anaszewski int ret = 0; 3393ef7de53SJacek Anaszewski 3403ef7de53SJacek Anaszewski if (led_cdev->brightness_get) { 3413ef7de53SJacek Anaszewski ret = led_cdev->brightness_get(led_cdev); 3423ef7de53SJacek Anaszewski if (ret >= 0) { 3433ef7de53SJacek Anaszewski led_cdev->brightness = ret; 3443ef7de53SJacek Anaszewski return 0; 3453ef7de53SJacek Anaszewski } 3463ef7de53SJacek Anaszewski } 3473ef7de53SJacek Anaszewski 3483ef7de53SJacek Anaszewski return ret; 3493ef7de53SJacek Anaszewski } 3502806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_update_brightness); 351acd899e4SJacek Anaszewski 3528e1f4561SKrzysztof Kozlowski u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size) 3538e1f4561SKrzysztof Kozlowski { 354fd81d7e9SAndy Shevchenko struct fwnode_handle *fwnode = led_cdev->dev->fwnode; 3558e1f4561SKrzysztof Kozlowski u32 *pattern; 3568e1f4561SKrzysztof Kozlowski int count; 3578e1f4561SKrzysztof Kozlowski 358fd81d7e9SAndy Shevchenko count = fwnode_property_count_u32(fwnode, "led-pattern"); 3598e1f4561SKrzysztof Kozlowski if (count < 0) 3608e1f4561SKrzysztof Kozlowski return NULL; 3618e1f4561SKrzysztof Kozlowski 3628e1f4561SKrzysztof Kozlowski pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL); 3638e1f4561SKrzysztof Kozlowski if (!pattern) 3648e1f4561SKrzysztof Kozlowski return NULL; 3658e1f4561SKrzysztof Kozlowski 366fd81d7e9SAndy Shevchenko if (fwnode_property_read_u32_array(fwnode, "led-pattern", pattern, count)) { 3678e1f4561SKrzysztof Kozlowski kfree(pattern); 3688e1f4561SKrzysztof Kozlowski return NULL; 3698e1f4561SKrzysztof Kozlowski } 3708e1f4561SKrzysztof Kozlowski 3718e1f4561SKrzysztof Kozlowski *size = count; 3728e1f4561SKrzysztof Kozlowski 3738e1f4561SKrzysztof Kozlowski return pattern; 3748e1f4561SKrzysztof Kozlowski } 3758e1f4561SKrzysztof Kozlowski EXPORT_SYMBOL_GPL(led_get_default_pattern); 3768e1f4561SKrzysztof Kozlowski 377acd899e4SJacek Anaszewski /* Caller must ensure led_cdev->led_access held */ 378acd899e4SJacek Anaszewski void led_sysfs_disable(struct led_classdev *led_cdev) 379acd899e4SJacek Anaszewski { 380acd899e4SJacek Anaszewski lockdep_assert_held(&led_cdev->led_access); 381acd899e4SJacek Anaszewski 382acd899e4SJacek Anaszewski led_cdev->flags |= LED_SYSFS_DISABLE; 383acd899e4SJacek Anaszewski } 384acd899e4SJacek Anaszewski EXPORT_SYMBOL_GPL(led_sysfs_disable); 385acd899e4SJacek Anaszewski 386acd899e4SJacek Anaszewski /* Caller must ensure led_cdev->led_access held */ 387acd899e4SJacek Anaszewski void led_sysfs_enable(struct led_classdev *led_cdev) 388acd899e4SJacek Anaszewski { 389acd899e4SJacek Anaszewski lockdep_assert_held(&led_cdev->led_access); 390acd899e4SJacek Anaszewski 391acd899e4SJacek Anaszewski led_cdev->flags &= ~LED_SYSFS_DISABLE; 392acd899e4SJacek Anaszewski } 393acd899e4SJacek Anaszewski EXPORT_SYMBOL_GPL(led_sysfs_enable); 394bb4e9af0SJacek Anaszewski 395bb4e9af0SJacek Anaszewski static void led_parse_fwnode_props(struct device *dev, 396bb4e9af0SJacek Anaszewski struct fwnode_handle *fwnode, 397bb4e9af0SJacek Anaszewski struct led_properties *props) 398bb4e9af0SJacek Anaszewski { 399bb4e9af0SJacek Anaszewski int ret; 400bb4e9af0SJacek Anaszewski 401bb4e9af0SJacek Anaszewski if (!fwnode) 402bb4e9af0SJacek Anaszewski return; 403bb4e9af0SJacek Anaszewski 404bb4e9af0SJacek Anaszewski if (fwnode_property_present(fwnode, "label")) { 405bb4e9af0SJacek Anaszewski ret = fwnode_property_read_string(fwnode, "label", &props->label); 406bb4e9af0SJacek Anaszewski if (ret) 407bb4e9af0SJacek Anaszewski dev_err(dev, "Error parsing 'label' property (%d)\n", ret); 408bb4e9af0SJacek Anaszewski return; 409bb4e9af0SJacek Anaszewski } 410bb4e9af0SJacek Anaszewski 411bb4e9af0SJacek Anaszewski if (fwnode_property_present(fwnode, "color")) { 412bb4e9af0SJacek Anaszewski ret = fwnode_property_read_u32(fwnode, "color", &props->color); 413bb4e9af0SJacek Anaszewski if (ret) 414bb4e9af0SJacek Anaszewski dev_err(dev, "Error parsing 'color' property (%d)\n", ret); 415bb4e9af0SJacek Anaszewski else if (props->color >= LED_COLOR_ID_MAX) 416bb4e9af0SJacek Anaszewski dev_err(dev, "LED color identifier out of range\n"); 417bb4e9af0SJacek Anaszewski else 418bb4e9af0SJacek Anaszewski props->color_present = true; 419bb4e9af0SJacek Anaszewski } 420bb4e9af0SJacek Anaszewski 421bb4e9af0SJacek Anaszewski 422bb4e9af0SJacek Anaszewski if (!fwnode_property_present(fwnode, "function")) 423bb4e9af0SJacek Anaszewski return; 424bb4e9af0SJacek Anaszewski 425bb4e9af0SJacek Anaszewski ret = fwnode_property_read_string(fwnode, "function", &props->function); 426bb4e9af0SJacek Anaszewski if (ret) { 427bb4e9af0SJacek Anaszewski dev_err(dev, 428bb4e9af0SJacek Anaszewski "Error parsing 'function' property (%d)\n", 429bb4e9af0SJacek Anaszewski ret); 430bb4e9af0SJacek Anaszewski } 431bb4e9af0SJacek Anaszewski 432bb4e9af0SJacek Anaszewski if (!fwnode_property_present(fwnode, "function-enumerator")) 433bb4e9af0SJacek Anaszewski return; 434bb4e9af0SJacek Anaszewski 435bb4e9af0SJacek Anaszewski ret = fwnode_property_read_u32(fwnode, "function-enumerator", 436bb4e9af0SJacek Anaszewski &props->func_enum); 437bb4e9af0SJacek Anaszewski if (ret) { 438bb4e9af0SJacek Anaszewski dev_err(dev, 439bb4e9af0SJacek Anaszewski "Error parsing 'function-enumerator' property (%d)\n", 440bb4e9af0SJacek Anaszewski ret); 441bb4e9af0SJacek Anaszewski } else { 442bb4e9af0SJacek Anaszewski props->func_enum_present = true; 443bb4e9af0SJacek Anaszewski } 444bb4e9af0SJacek Anaszewski } 445bb4e9af0SJacek Anaszewski 446bb4e9af0SJacek Anaszewski int led_compose_name(struct device *dev, struct led_init_data *init_data, 447bb4e9af0SJacek Anaszewski char *led_classdev_name) 448bb4e9af0SJacek Anaszewski { 449bb4e9af0SJacek Anaszewski struct led_properties props = {}; 450bb4e9af0SJacek Anaszewski struct fwnode_handle *fwnode = init_data->fwnode; 451bb4e9af0SJacek Anaszewski const char *devicename = init_data->devicename; 452bb4e9af0SJacek Anaszewski 45377dce3a2SPavel Machek /* We want to label LEDs that can produce full range of colors 45477dce3a2SPavel Machek * as RGB, not multicolor */ 45577dce3a2SPavel Machek BUG_ON(props.color == LED_COLOR_ID_MULTI); 45677dce3a2SPavel Machek 457bb4e9af0SJacek Anaszewski if (!led_classdev_name) 458bb4e9af0SJacek Anaszewski return -EINVAL; 459bb4e9af0SJacek Anaszewski 460bb4e9af0SJacek Anaszewski led_parse_fwnode_props(dev, fwnode, &props); 461bb4e9af0SJacek Anaszewski 462bb4e9af0SJacek Anaszewski if (props.label) { 463bb4e9af0SJacek Anaszewski /* 464bb4e9af0SJacek Anaszewski * If init_data.devicename is NULL, then it indicates that 465bb4e9af0SJacek Anaszewski * DT label should be used as-is for LED class device name. 466bb4e9af0SJacek Anaszewski * Otherwise the label is prepended with devicename to compose 467bb4e9af0SJacek Anaszewski * the final LED class device name. 468bb4e9af0SJacek Anaszewski */ 469bb4e9af0SJacek Anaszewski if (!devicename) { 470bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, props.label, 471bb4e9af0SJacek Anaszewski LED_MAX_NAME_SIZE); 472bb4e9af0SJacek Anaszewski } else { 473bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s", 474bb4e9af0SJacek Anaszewski devicename, props.label); 475bb4e9af0SJacek Anaszewski } 476bb4e9af0SJacek Anaszewski } else if (props.function || props.color_present) { 477bb4e9af0SJacek Anaszewski char tmp_buf[LED_MAX_NAME_SIZE]; 478bb4e9af0SJacek Anaszewski 479bb4e9af0SJacek Anaszewski if (props.func_enum_present) { 480bb4e9af0SJacek Anaszewski snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d", 481bb4e9af0SJacek Anaszewski props.color_present ? led_colors[props.color] : "", 482bb4e9af0SJacek Anaszewski props.function ?: "", props.func_enum); 483bb4e9af0SJacek Anaszewski } else { 484bb4e9af0SJacek Anaszewski snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s", 485bb4e9af0SJacek Anaszewski props.color_present ? led_colors[props.color] : "", 486bb4e9af0SJacek Anaszewski props.function ?: ""); 487bb4e9af0SJacek Anaszewski } 488bb4e9af0SJacek Anaszewski if (init_data->devname_mandatory) { 489bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s", 490bb4e9af0SJacek Anaszewski devicename, tmp_buf); 491bb4e9af0SJacek Anaszewski } else { 492bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE); 493bb4e9af0SJacek Anaszewski 494bb4e9af0SJacek Anaszewski } 495bb4e9af0SJacek Anaszewski } else if (init_data->default_label) { 496bb4e9af0SJacek Anaszewski if (!devicename) { 497bb4e9af0SJacek Anaszewski dev_err(dev, "Legacy LED naming requires devicename segment"); 498bb4e9af0SJacek Anaszewski return -EINVAL; 499bb4e9af0SJacek Anaszewski } 500bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s", 501bb4e9af0SJacek Anaszewski devicename, init_data->default_label); 502bb4e9af0SJacek Anaszewski } else if (is_of_node(fwnode)) { 503bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, to_of_node(fwnode)->name, 504bb4e9af0SJacek Anaszewski LED_MAX_NAME_SIZE); 505bb4e9af0SJacek Anaszewski } else 506bb4e9af0SJacek Anaszewski return -EINVAL; 507bb4e9af0SJacek Anaszewski 508bb4e9af0SJacek Anaszewski return 0; 509bb4e9af0SJacek Anaszewski } 510bb4e9af0SJacek Anaszewski EXPORT_SYMBOL_GPL(led_compose_name); 511791bc411SDenis Osterland-Heim 512791bc411SDenis Osterland-Heim enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode) 513791bc411SDenis Osterland-Heim { 514791bc411SDenis Osterland-Heim const char *state = NULL; 515791bc411SDenis Osterland-Heim 516791bc411SDenis Osterland-Heim if (!fwnode_property_read_string(fwnode, "default-state", &state)) { 517791bc411SDenis Osterland-Heim if (!strcmp(state, "keep")) 518791bc411SDenis Osterland-Heim return LEDS_DEFSTATE_KEEP; 519791bc411SDenis Osterland-Heim if (!strcmp(state, "on")) 520791bc411SDenis Osterland-Heim return LEDS_DEFSTATE_ON; 521791bc411SDenis Osterland-Heim } 522791bc411SDenis Osterland-Heim 523791bc411SDenis Osterland-Heim return LEDS_DEFSTATE_OFF; 524791bc411SDenis Osterland-Heim } 525791bc411SDenis Osterland-Heim EXPORT_SYMBOL_GPL(led_init_default_state_get); 526