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> 16*bb4e9af0SJacek Anaszewski #include <linux/property.h> 1772f8da32SRichard Purdie #include <linux/rwsem.h> 188e1f4561SKrzysztof Kozlowski #include <linux/slab.h> 19*bb4e9af0SJacek 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 28*bb4e9af0SJacek Anaszewski const char * const led_colors[LED_COLOR_ID_MAX] = { 29*bb4e9af0SJacek Anaszewski [LED_COLOR_ID_WHITE] = "white", 30*bb4e9af0SJacek Anaszewski [LED_COLOR_ID_RED] = "red", 31*bb4e9af0SJacek Anaszewski [LED_COLOR_ID_GREEN] = "green", 32*bb4e9af0SJacek Anaszewski [LED_COLOR_ID_BLUE] = "blue", 33*bb4e9af0SJacek Anaszewski [LED_COLOR_ID_AMBER] = "amber", 34*bb4e9af0SJacek Anaszewski [LED_COLOR_ID_VIOLET] = "violet", 35*bb4e9af0SJacek Anaszewski [LED_COLOR_ID_YELLOW] = "yellow", 36*bb4e9af0SJacek Anaszewski [LED_COLOR_ID_IR] = "ir", 37*bb4e9af0SJacek Anaszewski }; 38*bb4e9af0SJacek Anaszewski EXPORT_SYMBOL_GPL(led_colors); 39*bb4e9af0SJacek Anaszewski 40d4887af9SHeiner Kallweit static int __led_set_brightness(struct led_classdev *led_cdev, 41d4887af9SHeiner Kallweit enum led_brightness value) 42d4887af9SHeiner Kallweit { 43d4887af9SHeiner Kallweit if (!led_cdev->brightness_set) 44d4887af9SHeiner Kallweit return -ENOTSUPP; 45d4887af9SHeiner Kallweit 46d4887af9SHeiner Kallweit led_cdev->brightness_set(led_cdev, value); 47d4887af9SHeiner Kallweit 48d4887af9SHeiner Kallweit return 0; 49d4887af9SHeiner Kallweit } 50d4887af9SHeiner Kallweit 51d4887af9SHeiner Kallweit static int __led_set_brightness_blocking(struct led_classdev *led_cdev, 52d4887af9SHeiner Kallweit enum led_brightness 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 117757b06aeSJacek Anaszewski static void set_brightness_delayed(struct work_struct *ws) 118757b06aeSJacek Anaszewski { 119757b06aeSJacek Anaszewski struct led_classdev *led_cdev = 120757b06aeSJacek Anaszewski container_of(ws, struct led_classdev, set_brightness_work); 1211afcadfcSJacek Anaszewski int ret = 0; 122757b06aeSJacek Anaszewski 123a9c6ce57SHans de Goede if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) { 124f1e80c07SJacek Anaszewski led_cdev->delayed_set_value = LED_OFF; 125757b06aeSJacek Anaszewski led_stop_software_blink(led_cdev); 126f1e80c07SJacek Anaszewski } 127757b06aeSJacek Anaszewski 128d4887af9SHeiner Kallweit ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value); 129d4887af9SHeiner Kallweit if (ret == -ENOTSUPP) 130d4887af9SHeiner Kallweit ret = __led_set_brightness_blocking(led_cdev, 1311afcadfcSJacek Anaszewski led_cdev->delayed_set_value); 132d84d80f3SHeiner Kallweit if (ret < 0 && 133d84d80f3SHeiner Kallweit /* LED HW might have been unplugged, therefore don't warn */ 134d84d80f3SHeiner Kallweit !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) && 135d84d80f3SHeiner Kallweit (led_cdev->flags & LED_HW_PLUGGABLE))) 1361afcadfcSJacek Anaszewski dev_err(led_cdev->dev, 1371afcadfcSJacek Anaszewski "Setting an LED's brightness failed (%d)\n", ret); 138757b06aeSJacek Anaszewski } 139757b06aeSJacek Anaszewski 140a403d930SBryan Wu static void led_set_software_blink(struct led_classdev *led_cdev, 141a403d930SBryan Wu unsigned long delay_on, 142a403d930SBryan Wu unsigned long delay_off) 143a403d930SBryan Wu { 144a403d930SBryan Wu int current_brightness; 145a403d930SBryan Wu 146a403d930SBryan Wu current_brightness = led_get_brightness(led_cdev); 147a403d930SBryan Wu if (current_brightness) 148a403d930SBryan Wu led_cdev->blink_brightness = current_brightness; 149a403d930SBryan Wu if (!led_cdev->blink_brightness) 150a403d930SBryan Wu led_cdev->blink_brightness = led_cdev->max_brightness; 151a403d930SBryan Wu 152a403d930SBryan Wu led_cdev->blink_delay_on = delay_on; 153a403d930SBryan Wu led_cdev->blink_delay_off = delay_off; 154a403d930SBryan Wu 1558d82fef8SStefan Sørensen /* never on - just set to off */ 1568d82fef8SStefan Sørensen if (!delay_on) { 15781fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, LED_OFF); 158a403d930SBryan Wu return; 1598d82fef8SStefan Sørensen } 160a403d930SBryan Wu 161a403d930SBryan Wu /* never off - just set to brightness */ 162a403d930SBryan Wu if (!delay_off) { 16381fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, 16481fe8e5bSJacek Anaszewski led_cdev->blink_brightness); 165a403d930SBryan Wu return; 166a403d930SBryan Wu } 167a403d930SBryan Wu 168a9c6ce57SHans de Goede set_bit(LED_BLINK_SW, &led_cdev->work_flags); 1699067359fSJiri Kosina mod_timer(&led_cdev->blink_timer, jiffies + 1); 170a403d930SBryan Wu } 171a403d930SBryan Wu 172a403d930SBryan Wu 17320c0e6b8SBryan Wu static void led_blink_setup(struct led_classdev *led_cdev, 174a403d930SBryan Wu unsigned long *delay_on, 175a403d930SBryan Wu unsigned long *delay_off) 176a403d930SBryan Wu { 177a9c6ce57SHans de Goede if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) && 1785bb629c5SFabio Baltieri led_cdev->blink_set && 179a403d930SBryan Wu !led_cdev->blink_set(led_cdev, delay_on, delay_off)) 180a403d930SBryan Wu return; 181a403d930SBryan Wu 182a403d930SBryan Wu /* blink with 1 Hz as default if nothing specified */ 183a403d930SBryan Wu if (!*delay_on && !*delay_off) 184a403d930SBryan Wu *delay_on = *delay_off = 500; 185a403d930SBryan Wu 186a403d930SBryan Wu led_set_software_blink(led_cdev, *delay_on, *delay_off); 187a403d930SBryan Wu } 1885bb629c5SFabio Baltieri 189757b06aeSJacek Anaszewski void led_init_core(struct led_classdev *led_cdev) 190757b06aeSJacek Anaszewski { 191757b06aeSJacek Anaszewski INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed); 192757b06aeSJacek Anaszewski 19349404665SKees Cook timer_setup(&led_cdev->blink_timer, led_timer_function, 0); 194757b06aeSJacek Anaszewski } 195757b06aeSJacek Anaszewski EXPORT_SYMBOL_GPL(led_init_core); 196757b06aeSJacek Anaszewski 1975bb629c5SFabio Baltieri void led_blink_set(struct led_classdev *led_cdev, 1985bb629c5SFabio Baltieri unsigned long *delay_on, 1995bb629c5SFabio Baltieri unsigned long *delay_off) 2005bb629c5SFabio Baltieri { 2017b6af2c5SJacek Anaszewski del_timer_sync(&led_cdev->blink_timer); 2025bb629c5SFabio Baltieri 2037b6af2c5SJacek Anaszewski clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 204a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags); 205a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags); 2065bb629c5SFabio Baltieri 2075bb629c5SFabio Baltieri led_blink_setup(led_cdev, delay_on, delay_off); 2085bb629c5SFabio Baltieri } 2092806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_blink_set); 210a403d930SBryan Wu 2115bb629c5SFabio Baltieri void led_blink_set_oneshot(struct led_classdev *led_cdev, 2125bb629c5SFabio Baltieri unsigned long *delay_on, 2135bb629c5SFabio Baltieri unsigned long *delay_off, 2145bb629c5SFabio Baltieri int invert) 2155bb629c5SFabio Baltieri { 216a9c6ce57SHans de Goede if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) && 2179067359fSJiri Kosina timer_pending(&led_cdev->blink_timer)) 2185bb629c5SFabio Baltieri return; 2195bb629c5SFabio Baltieri 220a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags); 221a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags); 2225bb629c5SFabio Baltieri 2235bb629c5SFabio Baltieri if (invert) 224a9c6ce57SHans de Goede set_bit(LED_BLINK_INVERT, &led_cdev->work_flags); 2255bb629c5SFabio Baltieri else 226a9c6ce57SHans de Goede clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags); 2275bb629c5SFabio Baltieri 2285bb629c5SFabio Baltieri led_blink_setup(led_cdev, delay_on, delay_off); 2295bb629c5SFabio Baltieri } 2302806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_blink_set_oneshot); 2315bb629c5SFabio Baltieri 232d23a22a7SFabio Baltieri void led_stop_software_blink(struct led_classdev *led_cdev) 233a403d930SBryan Wu { 2349067359fSJiri Kosina del_timer_sync(&led_cdev->blink_timer); 23543786482SFabio Baltieri led_cdev->blink_delay_on = 0; 23643786482SFabio Baltieri led_cdev->blink_delay_off = 0; 237a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags); 238d23a22a7SFabio Baltieri } 239d23a22a7SFabio Baltieri EXPORT_SYMBOL_GPL(led_stop_software_blink); 240d23a22a7SFabio Baltieri 241d23a22a7SFabio Baltieri void led_set_brightness(struct led_classdev *led_cdev, 242d23a22a7SFabio Baltieri enum led_brightness brightness) 243d23a22a7SFabio Baltieri { 244f1e80c07SJacek Anaszewski /* 2457cfe749fSTony Makkiel * If software blink is active, delay brightness setting 246f1e80c07SJacek Anaszewski * until the next timer tick. 247f1e80c07SJacek Anaszewski */ 248a9c6ce57SHans de Goede if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) { 249f1e80c07SJacek Anaszewski /* 250f1e80c07SJacek Anaszewski * If we need to disable soft blinking delegate this to the 251f1e80c07SJacek Anaszewski * work queue task to avoid problems in case we are called 252f1e80c07SJacek Anaszewski * from hard irq context. 253f1e80c07SJacek Anaszewski */ 254f1e80c07SJacek Anaszewski if (brightness == LED_OFF) { 255a9c6ce57SHans de Goede set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags); 256d23a22a7SFabio Baltieri schedule_work(&led_cdev->set_brightness_work); 257f1e80c07SJacek Anaszewski } else { 258a9c6ce57SHans de Goede set_bit(LED_BLINK_BRIGHTNESS_CHANGE, 259a9c6ce57SHans de Goede &led_cdev->work_flags); 260eb1610b4SHans de Goede led_cdev->new_blink_brightness = brightness; 261f1e80c07SJacek Anaszewski } 262d23a22a7SFabio Baltieri return; 263d23a22a7SFabio Baltieri } 26443786482SFabio Baltieri 26581fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, brightness); 266a403d930SBryan Wu } 2672806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness); 2683ef7de53SJacek Anaszewski 26981fe8e5bSJacek Anaszewski void led_set_brightness_nopm(struct led_classdev *led_cdev, 27081fe8e5bSJacek Anaszewski enum led_brightness value) 27181fe8e5bSJacek Anaszewski { 27281fe8e5bSJacek Anaszewski /* Use brightness_set op if available, it is guaranteed not to sleep */ 273d4887af9SHeiner Kallweit if (!__led_set_brightness(led_cdev, value)) 27481fe8e5bSJacek Anaszewski return; 27581fe8e5bSJacek Anaszewski 27681fe8e5bSJacek Anaszewski /* If brightness setting can sleep, delegate it to a work queue task */ 27781fe8e5bSJacek Anaszewski led_cdev->delayed_set_value = value; 27881fe8e5bSJacek Anaszewski schedule_work(&led_cdev->set_brightness_work); 27981fe8e5bSJacek Anaszewski } 28081fe8e5bSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_nopm); 28181fe8e5bSJacek Anaszewski 28281fe8e5bSJacek Anaszewski void led_set_brightness_nosleep(struct led_classdev *led_cdev, 28381fe8e5bSJacek Anaszewski enum led_brightness value) 28481fe8e5bSJacek Anaszewski { 28581fe8e5bSJacek Anaszewski led_cdev->brightness = min(value, led_cdev->max_brightness); 28681fe8e5bSJacek Anaszewski 28781fe8e5bSJacek Anaszewski if (led_cdev->flags & LED_SUSPENDED) 28881fe8e5bSJacek Anaszewski return; 28981fe8e5bSJacek Anaszewski 29081fe8e5bSJacek Anaszewski led_set_brightness_nopm(led_cdev, led_cdev->brightness); 29181fe8e5bSJacek Anaszewski } 29281fe8e5bSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_nosleep); 29381fe8e5bSJacek Anaszewski 29413ae79bbSJacek Anaszewski int led_set_brightness_sync(struct led_classdev *led_cdev, 29513ae79bbSJacek Anaszewski enum led_brightness value) 29613ae79bbSJacek Anaszewski { 29713ae79bbSJacek Anaszewski if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) 29813ae79bbSJacek Anaszewski return -EBUSY; 29913ae79bbSJacek Anaszewski 30013ae79bbSJacek Anaszewski led_cdev->brightness = min(value, led_cdev->max_brightness); 30113ae79bbSJacek Anaszewski 30213ae79bbSJacek Anaszewski if (led_cdev->flags & LED_SUSPENDED) 30313ae79bbSJacek Anaszewski return 0; 30413ae79bbSJacek Anaszewski 305d4887af9SHeiner Kallweit return __led_set_brightness_blocking(led_cdev, led_cdev->brightness); 30613ae79bbSJacek Anaszewski } 30713ae79bbSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_sync); 30813ae79bbSJacek Anaszewski 3093ef7de53SJacek Anaszewski int led_update_brightness(struct led_classdev *led_cdev) 3103ef7de53SJacek Anaszewski { 3113ef7de53SJacek Anaszewski int ret = 0; 3123ef7de53SJacek Anaszewski 3133ef7de53SJacek Anaszewski if (led_cdev->brightness_get) { 3143ef7de53SJacek Anaszewski ret = led_cdev->brightness_get(led_cdev); 3153ef7de53SJacek Anaszewski if (ret >= 0) { 3163ef7de53SJacek Anaszewski led_cdev->brightness = ret; 3173ef7de53SJacek Anaszewski return 0; 3183ef7de53SJacek Anaszewski } 3193ef7de53SJacek Anaszewski } 3203ef7de53SJacek Anaszewski 3213ef7de53SJacek Anaszewski return ret; 3223ef7de53SJacek Anaszewski } 3232806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_update_brightness); 324acd899e4SJacek Anaszewski 3258e1f4561SKrzysztof Kozlowski u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size) 3268e1f4561SKrzysztof Kozlowski { 3278e1f4561SKrzysztof Kozlowski struct device_node *np = dev_of_node(led_cdev->dev); 3288e1f4561SKrzysztof Kozlowski u32 *pattern; 3298e1f4561SKrzysztof Kozlowski int count; 3308e1f4561SKrzysztof Kozlowski 3318e1f4561SKrzysztof Kozlowski if (!np) 3328e1f4561SKrzysztof Kozlowski return NULL; 3338e1f4561SKrzysztof Kozlowski 3348e1f4561SKrzysztof Kozlowski count = of_property_count_u32_elems(np, "led-pattern"); 3358e1f4561SKrzysztof Kozlowski if (count < 0) 3368e1f4561SKrzysztof Kozlowski return NULL; 3378e1f4561SKrzysztof Kozlowski 3388e1f4561SKrzysztof Kozlowski pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL); 3398e1f4561SKrzysztof Kozlowski if (!pattern) 3408e1f4561SKrzysztof Kozlowski return NULL; 3418e1f4561SKrzysztof Kozlowski 3428e1f4561SKrzysztof Kozlowski if (of_property_read_u32_array(np, "led-pattern", pattern, count)) { 3438e1f4561SKrzysztof Kozlowski kfree(pattern); 3448e1f4561SKrzysztof Kozlowski return NULL; 3458e1f4561SKrzysztof Kozlowski } 3468e1f4561SKrzysztof Kozlowski 3478e1f4561SKrzysztof Kozlowski *size = count; 3488e1f4561SKrzysztof Kozlowski 3498e1f4561SKrzysztof Kozlowski return pattern; 3508e1f4561SKrzysztof Kozlowski } 3518e1f4561SKrzysztof Kozlowski EXPORT_SYMBOL_GPL(led_get_default_pattern); 3528e1f4561SKrzysztof Kozlowski 353acd899e4SJacek Anaszewski /* Caller must ensure led_cdev->led_access held */ 354acd899e4SJacek Anaszewski void led_sysfs_disable(struct led_classdev *led_cdev) 355acd899e4SJacek Anaszewski { 356acd899e4SJacek Anaszewski lockdep_assert_held(&led_cdev->led_access); 357acd899e4SJacek Anaszewski 358acd899e4SJacek Anaszewski led_cdev->flags |= LED_SYSFS_DISABLE; 359acd899e4SJacek Anaszewski } 360acd899e4SJacek Anaszewski EXPORT_SYMBOL_GPL(led_sysfs_disable); 361acd899e4SJacek Anaszewski 362acd899e4SJacek Anaszewski /* Caller must ensure led_cdev->led_access held */ 363acd899e4SJacek Anaszewski void led_sysfs_enable(struct led_classdev *led_cdev) 364acd899e4SJacek Anaszewski { 365acd899e4SJacek Anaszewski lockdep_assert_held(&led_cdev->led_access); 366acd899e4SJacek Anaszewski 367acd899e4SJacek Anaszewski led_cdev->flags &= ~LED_SYSFS_DISABLE; 368acd899e4SJacek Anaszewski } 369acd899e4SJacek Anaszewski EXPORT_SYMBOL_GPL(led_sysfs_enable); 370*bb4e9af0SJacek Anaszewski 371*bb4e9af0SJacek Anaszewski static void led_parse_fwnode_props(struct device *dev, 372*bb4e9af0SJacek Anaszewski struct fwnode_handle *fwnode, 373*bb4e9af0SJacek Anaszewski struct led_properties *props) 374*bb4e9af0SJacek Anaszewski { 375*bb4e9af0SJacek Anaszewski int ret; 376*bb4e9af0SJacek Anaszewski 377*bb4e9af0SJacek Anaszewski if (!fwnode) 378*bb4e9af0SJacek Anaszewski return; 379*bb4e9af0SJacek Anaszewski 380*bb4e9af0SJacek Anaszewski if (fwnode_property_present(fwnode, "label")) { 381*bb4e9af0SJacek Anaszewski ret = fwnode_property_read_string(fwnode, "label", &props->label); 382*bb4e9af0SJacek Anaszewski if (ret) 383*bb4e9af0SJacek Anaszewski dev_err(dev, "Error parsing 'label' property (%d)\n", ret); 384*bb4e9af0SJacek Anaszewski return; 385*bb4e9af0SJacek Anaszewski } 386*bb4e9af0SJacek Anaszewski 387*bb4e9af0SJacek Anaszewski if (fwnode_property_present(fwnode, "color")) { 388*bb4e9af0SJacek Anaszewski ret = fwnode_property_read_u32(fwnode, "color", &props->color); 389*bb4e9af0SJacek Anaszewski if (ret) 390*bb4e9af0SJacek Anaszewski dev_err(dev, "Error parsing 'color' property (%d)\n", ret); 391*bb4e9af0SJacek Anaszewski else if (props->color >= LED_COLOR_ID_MAX) 392*bb4e9af0SJacek Anaszewski dev_err(dev, "LED color identifier out of range\n"); 393*bb4e9af0SJacek Anaszewski else 394*bb4e9af0SJacek Anaszewski props->color_present = true; 395*bb4e9af0SJacek Anaszewski } 396*bb4e9af0SJacek Anaszewski 397*bb4e9af0SJacek Anaszewski 398*bb4e9af0SJacek Anaszewski if (!fwnode_property_present(fwnode, "function")) 399*bb4e9af0SJacek Anaszewski return; 400*bb4e9af0SJacek Anaszewski 401*bb4e9af0SJacek Anaszewski ret = fwnode_property_read_string(fwnode, "function", &props->function); 402*bb4e9af0SJacek Anaszewski if (ret) { 403*bb4e9af0SJacek Anaszewski dev_err(dev, 404*bb4e9af0SJacek Anaszewski "Error parsing 'function' property (%d)\n", 405*bb4e9af0SJacek Anaszewski ret); 406*bb4e9af0SJacek Anaszewski } 407*bb4e9af0SJacek Anaszewski 408*bb4e9af0SJacek Anaszewski if (!fwnode_property_present(fwnode, "function-enumerator")) 409*bb4e9af0SJacek Anaszewski return; 410*bb4e9af0SJacek Anaszewski 411*bb4e9af0SJacek Anaszewski ret = fwnode_property_read_u32(fwnode, "function-enumerator", 412*bb4e9af0SJacek Anaszewski &props->func_enum); 413*bb4e9af0SJacek Anaszewski if (ret) { 414*bb4e9af0SJacek Anaszewski dev_err(dev, 415*bb4e9af0SJacek Anaszewski "Error parsing 'function-enumerator' property (%d)\n", 416*bb4e9af0SJacek Anaszewski ret); 417*bb4e9af0SJacek Anaszewski } else { 418*bb4e9af0SJacek Anaszewski props->func_enum_present = true; 419*bb4e9af0SJacek Anaszewski } 420*bb4e9af0SJacek Anaszewski } 421*bb4e9af0SJacek Anaszewski 422*bb4e9af0SJacek Anaszewski int led_compose_name(struct device *dev, struct led_init_data *init_data, 423*bb4e9af0SJacek Anaszewski char *led_classdev_name) 424*bb4e9af0SJacek Anaszewski { 425*bb4e9af0SJacek Anaszewski struct led_properties props = {}; 426*bb4e9af0SJacek Anaszewski struct fwnode_handle *fwnode = init_data->fwnode; 427*bb4e9af0SJacek Anaszewski const char *devicename = init_data->devicename; 428*bb4e9af0SJacek Anaszewski 429*bb4e9af0SJacek Anaszewski if (!led_classdev_name) 430*bb4e9af0SJacek Anaszewski return -EINVAL; 431*bb4e9af0SJacek Anaszewski 432*bb4e9af0SJacek Anaszewski led_parse_fwnode_props(dev, fwnode, &props); 433*bb4e9af0SJacek Anaszewski 434*bb4e9af0SJacek Anaszewski if (props.label) { 435*bb4e9af0SJacek Anaszewski /* 436*bb4e9af0SJacek Anaszewski * If init_data.devicename is NULL, then it indicates that 437*bb4e9af0SJacek Anaszewski * DT label should be used as-is for LED class device name. 438*bb4e9af0SJacek Anaszewski * Otherwise the label is prepended with devicename to compose 439*bb4e9af0SJacek Anaszewski * the final LED class device name. 440*bb4e9af0SJacek Anaszewski */ 441*bb4e9af0SJacek Anaszewski if (!devicename) { 442*bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, props.label, 443*bb4e9af0SJacek Anaszewski LED_MAX_NAME_SIZE); 444*bb4e9af0SJacek Anaszewski } else { 445*bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s", 446*bb4e9af0SJacek Anaszewski devicename, props.label); 447*bb4e9af0SJacek Anaszewski } 448*bb4e9af0SJacek Anaszewski } else if (props.function || props.color_present) { 449*bb4e9af0SJacek Anaszewski char tmp_buf[LED_MAX_NAME_SIZE]; 450*bb4e9af0SJacek Anaszewski 451*bb4e9af0SJacek Anaszewski if (props.func_enum_present) { 452*bb4e9af0SJacek Anaszewski snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d", 453*bb4e9af0SJacek Anaszewski props.color_present ? led_colors[props.color] : "", 454*bb4e9af0SJacek Anaszewski props.function ?: "", props.func_enum); 455*bb4e9af0SJacek Anaszewski } else { 456*bb4e9af0SJacek Anaszewski snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s", 457*bb4e9af0SJacek Anaszewski props.color_present ? led_colors[props.color] : "", 458*bb4e9af0SJacek Anaszewski props.function ?: ""); 459*bb4e9af0SJacek Anaszewski } 460*bb4e9af0SJacek Anaszewski if (init_data->devname_mandatory) { 461*bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s", 462*bb4e9af0SJacek Anaszewski devicename, tmp_buf); 463*bb4e9af0SJacek Anaszewski } else { 464*bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE); 465*bb4e9af0SJacek Anaszewski 466*bb4e9af0SJacek Anaszewski } 467*bb4e9af0SJacek Anaszewski } else if (init_data->default_label) { 468*bb4e9af0SJacek Anaszewski if (!devicename) { 469*bb4e9af0SJacek Anaszewski dev_err(dev, "Legacy LED naming requires devicename segment"); 470*bb4e9af0SJacek Anaszewski return -EINVAL; 471*bb4e9af0SJacek Anaszewski } 472*bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s", 473*bb4e9af0SJacek Anaszewski devicename, init_data->default_label); 474*bb4e9af0SJacek Anaszewski } else if (is_of_node(fwnode)) { 475*bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, to_of_node(fwnode)->name, 476*bb4e9af0SJacek Anaszewski LED_MAX_NAME_SIZE); 477*bb4e9af0SJacek Anaszewski } else 478*bb4e9af0SJacek Anaszewski return -EINVAL; 479*bb4e9af0SJacek Anaszewski 480*bb4e9af0SJacek Anaszewski return 0; 481*bb4e9af0SJacek Anaszewski } 482*bb4e9af0SJacek Anaszewski EXPORT_SYMBOL_GPL(led_compose_name); 483