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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LED Class Core
4 *
5 * Copyright 2005-2006 Openedhand Ltd.
6 *
7 * Author: Richard Purdie <rpurdie@openedhand.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/leds.h>
12#include <linux/list.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/of.h>
16#include <linux/property.h>
17#include <linux/rwsem.h>
18#include <linux/slab.h>
19#include <uapi/linux/uleds.h>
20#include "leds.h"
21
22DECLARE_RWSEM(leds_list_lock);
23EXPORT_SYMBOL_GPL(leds_list_lock);
24
25LIST_HEAD(leds_list);
26EXPORT_SYMBOL_GPL(leds_list);
27
28const char * const led_colors[LED_COLOR_ID_MAX] = {
29 [LED_COLOR_ID_WHITE] = "white",
30 [LED_COLOR_ID_RED] = "red",
31 [LED_COLOR_ID_GREEN] = "green",
32 [LED_COLOR_ID_BLUE] = "blue",
33 [LED_COLOR_ID_AMBER] = "amber",
34 [LED_COLOR_ID_VIOLET] = "violet",
35 [LED_COLOR_ID_YELLOW] = "yellow",
36 [LED_COLOR_ID_IR] = "ir",
37 [LED_COLOR_ID_MULTI] = "multicolor",
38 [LED_COLOR_ID_RGB] = "rgb",
39};
40EXPORT_SYMBOL_GPL(led_colors);
41
42static int __led_set_brightness(struct led_classdev *led_cdev, unsigned int value)
43{
44 if (!led_cdev->brightness_set)
45 return -ENOTSUPP;
46
47 led_cdev->brightness_set(led_cdev, value);
48
49 return 0;
50}
51
52static int __led_set_brightness_blocking(struct led_classdev *led_cdev, unsigned int value)
53{
54 if (!led_cdev->brightness_set_blocking)
55 return -ENOTSUPP;
56
57 return led_cdev->brightness_set_blocking(led_cdev, value);
58}
59
60static void led_timer_function(struct timer_list *t)
61{
62 struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
63 unsigned long brightness;
64 unsigned long delay;
65
66 if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
67 led_set_brightness_nosleep(led_cdev, LED_OFF);
68 clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
69 return;
70 }
71
72 if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
73 &led_cdev->work_flags)) {
74 clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
75 return;
76 }
77
78 brightness = led_get_brightness(led_cdev);
79 if (!brightness) {
80 /* Time to switch the LED on. */
81 if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
82 &led_cdev->work_flags))
83 brightness = led_cdev->new_blink_brightness;
84 else
85 brightness = led_cdev->blink_brightness;
86 delay = led_cdev->blink_delay_on;
87 } else {
88 /* Store the current brightness value to be able
89 * to restore it when the delay_off period is over.
90 */
91 led_cdev->blink_brightness = brightness;
92 brightness = LED_OFF;
93 delay = led_cdev->blink_delay_off;
94 }
95
96 led_set_brightness_nosleep(led_cdev, brightness);
97
98 /* Return in next iteration if led is in one-shot mode and we are in
99 * the final blink state so that the led is toggled each delay_on +
100 * delay_off milliseconds in worst case.
101 */
102 if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
103 if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
104 if (brightness)
105 set_bit(LED_BLINK_ONESHOT_STOP,
106 &led_cdev->work_flags);
107 } else {
108 if (!brightness)
109 set_bit(LED_BLINK_ONESHOT_STOP,
110 &led_cdev->work_flags);
111 }
112 }
113
114 mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
115}
116
117static void set_brightness_delayed(struct work_struct *ws)
118{
119 struct led_classdev *led_cdev =
120 container_of(ws, struct led_classdev, set_brightness_work);
121 int ret = 0;
122
123 if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
124 led_cdev->delayed_set_value = LED_OFF;
125 led_stop_software_blink(led_cdev);
126 }
127
128 ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
129 if (ret == -ENOTSUPP)
130 ret = __led_set_brightness_blocking(led_cdev,
131 led_cdev->delayed_set_value);
132 if (ret < 0 &&
133 /* LED HW might have been unplugged, therefore don't warn */
134 !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) &&
135 (led_cdev->flags & LED_HW_PLUGGABLE)))
136 dev_err(led_cdev->dev,
137 "Setting an LED's brightness failed (%d)\n", ret);
138}
139
140static void led_set_software_blink(struct led_classdev *led_cdev,
141 unsigned long delay_on,
142 unsigned long delay_off)
143{
144 int current_brightness;
145
146 current_brightness = led_get_brightness(led_cdev);
147 if (current_brightness)
148 led_cdev->blink_brightness = current_brightness;
149 if (!led_cdev->blink_brightness)
150 led_cdev->blink_brightness = led_cdev->max_brightness;
151
152 led_cdev->blink_delay_on = delay_on;
153 led_cdev->blink_delay_off = delay_off;
154
155 /* never on - just set to off */
156 if (!delay_on) {
157 led_set_brightness_nosleep(led_cdev, LED_OFF);
158 return;
159 }
160
161 /* never off - just set to brightness */
162 if (!delay_off) {
163 led_set_brightness_nosleep(led_cdev,
164 led_cdev->blink_brightness);
165 return;
166 }
167
168 set_bit(LED_BLINK_SW, &led_cdev->work_flags);
169 mod_timer(&led_cdev->blink_timer, jiffies + 1);
170}
171
172
173static void led_blink_setup(struct led_classdev *led_cdev,
174 unsigned long *delay_on,
175 unsigned long *delay_off)
176{
177 if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
178 led_cdev->blink_set &&
179 !led_cdev->blink_set(led_cdev, delay_on, delay_off))
180 return;
181
182 /* blink with 1 Hz as default if nothing specified */
183 if (!*delay_on && !*delay_off)
184 *delay_on = *delay_off = 500;
185
186 led_set_software_blink(led_cdev, *delay_on, *delay_off);
187}
188
189void led_init_core(struct led_classdev *led_cdev)
190{
191 INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
192
193 timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
194}
195EXPORT_SYMBOL_GPL(led_init_core);
196
197void led_blink_set(struct led_classdev *led_cdev,
198 unsigned long *delay_on,
199 unsigned long *delay_off)
200{
201 del_timer_sync(&led_cdev->blink_timer);
202
203 clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
204 clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
205 clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
206
207 led_blink_setup(led_cdev, delay_on, delay_off);
208}
209EXPORT_SYMBOL_GPL(led_blink_set);
210
211void led_blink_set_oneshot(struct led_classdev *led_cdev,
212 unsigned long *delay_on,
213 unsigned long *delay_off,
214 int invert)
215{
216 if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
217 timer_pending(&led_cdev->blink_timer))
218 return;
219
220 set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
221 clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
222
223 if (invert)
224 set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
225 else
226 clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
227
228 led_blink_setup(led_cdev, delay_on, delay_off);
229}
230EXPORT_SYMBOL_GPL(led_blink_set_oneshot);
231
232void led_stop_software_blink(struct led_classdev *led_cdev)
233{
234 del_timer_sync(&led_cdev->blink_timer);
235 led_cdev->blink_delay_on = 0;
236 led_cdev->blink_delay_off = 0;
237 clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
238}
239EXPORT_SYMBOL_GPL(led_stop_software_blink);
240
241void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness)
242{
243 /*
244 * If software blink is active, delay brightness setting
245 * until the next timer tick.
246 */
247 if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
248 /*
249 * If we need to disable soft blinking delegate this to the
250 * work queue task to avoid problems in case we are called
251 * from hard irq context.
252 */
253 if (!brightness) {
254 set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
255 schedule_work(&led_cdev->set_brightness_work);
256 } else {
257 set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
258 &led_cdev->work_flags);
259 led_cdev->new_blink_brightness = brightness;
260 }
261 return;
262 }
263
264 led_set_brightness_nosleep(led_cdev, brightness);
265}
266EXPORT_SYMBOL_GPL(led_set_brightness);
267
268void led_set_brightness_nopm(struct led_classdev *led_cdev, unsigned int value)
269{
270 /* Use brightness_set op if available, it is guaranteed not to sleep */
271 if (!__led_set_brightness(led_cdev, value))
272 return;
273
274 /* If brightness setting can sleep, delegate it to a work queue task */
275 led_cdev->delayed_set_value = value;
276 schedule_work(&led_cdev->set_brightness_work);
277}
278EXPORT_SYMBOL_GPL(led_set_brightness_nopm);
279
280void led_set_brightness_nosleep(struct led_classdev *led_cdev, unsigned int value)
281{
282 led_cdev->brightness = min(value, led_cdev->max_brightness);
283
284 if (led_cdev->flags & LED_SUSPENDED)
285 return;
286
287 led_set_brightness_nopm(led_cdev, led_cdev->brightness);
288}
289EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
290
291int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value)
292{
293 if (led_cdev->blink_delay_on || led_cdev->blink_delay_off)
294 return -EBUSY;
295
296 led_cdev->brightness = min(value, led_cdev->max_brightness);
297
298 if (led_cdev->flags & LED_SUSPENDED)
299 return 0;
300
301 return __led_set_brightness_blocking(led_cdev, led_cdev->brightness);
302}
303EXPORT_SYMBOL_GPL(led_set_brightness_sync);
304
305int led_update_brightness(struct led_classdev *led_cdev)
306{
307 int ret = 0;
308
309 if (led_cdev->brightness_get) {
310 ret = led_cdev->brightness_get(led_cdev);
311 if (ret >= 0) {
312 led_cdev->brightness = ret;
313 return 0;
314 }
315 }
316
317 return ret;
318}
319EXPORT_SYMBOL_GPL(led_update_brightness);
320
321u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)
322{
323 struct fwnode_handle *fwnode = led_cdev->dev->fwnode;
324 u32 *pattern;
325 int count;
326
327 count = fwnode_property_count_u32(fwnode, "led-pattern");
328 if (count < 0)
329 return NULL;
330
331 pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
332 if (!pattern)
333 return NULL;
334
335 if (fwnode_property_read_u32_array(fwnode, "led-pattern", pattern, count)) {
336 kfree(pattern);
337 return NULL;
338 }
339
340 *size = count;
341
342 return pattern;
343}
344EXPORT_SYMBOL_GPL(led_get_default_pattern);
345
346/* Caller must ensure led_cdev->led_access held */
347void led_sysfs_disable(struct led_classdev *led_cdev)
348{
349 lockdep_assert_held(&led_cdev->led_access);
350
351 led_cdev->flags |= LED_SYSFS_DISABLE;
352}
353EXPORT_SYMBOL_GPL(led_sysfs_disable);
354
355/* Caller must ensure led_cdev->led_access held */
356void led_sysfs_enable(struct led_classdev *led_cdev)
357{
358 lockdep_assert_held(&led_cdev->led_access);
359
360 led_cdev->flags &= ~LED_SYSFS_DISABLE;
361}
362EXPORT_SYMBOL_GPL(led_sysfs_enable);
363
364static void led_parse_fwnode_props(struct device *dev,
365 struct fwnode_handle *fwnode,
366 struct led_properties *props)
367{
368 int ret;
369
370 if (!fwnode)
371 return;
372
373 if (fwnode_property_present(fwnode, "label")) {
374 ret = fwnode_property_read_string(fwnode, "label", &props->label);
375 if (ret)
376 dev_err(dev, "Error parsing 'label' property (%d)\n", ret);
377 return;
378 }
379
380 if (fwnode_property_present(fwnode, "color")) {
381 ret = fwnode_property_read_u32(fwnode, "color", &props->color);
382 if (ret)
383 dev_err(dev, "Error parsing 'color' property (%d)\n", ret);
384 else if (props->color >= LED_COLOR_ID_MAX)
385 dev_err(dev, "LED color identifier out of range\n");
386 else
387 props->color_present = true;
388 }
389
390
391 if (!fwnode_property_present(fwnode, "function"))
392 return;
393
394 ret = fwnode_property_read_string(fwnode, "function", &props->function);
395 if (ret) {
396 dev_err(dev,
397 "Error parsing 'function' property (%d)\n",
398 ret);
399 }
400
401 if (!fwnode_property_present(fwnode, "function-enumerator"))
402 return;
403
404 ret = fwnode_property_read_u32(fwnode, "function-enumerator",
405 &props->func_enum);
406 if (ret) {
407 dev_err(dev,
408 "Error parsing 'function-enumerator' property (%d)\n",
409 ret);
410 } else {
411 props->func_enum_present = true;
412 }
413}
414
415int led_compose_name(struct device *dev, struct led_init_data *init_data,
416 char *led_classdev_name)
417{
418 struct led_properties props = {};
419 struct fwnode_handle *fwnode = init_data->fwnode;
420 const char *devicename = init_data->devicename;
421
422 /* We want to label LEDs that can produce full range of colors
423 * as RGB, not multicolor */
424 BUG_ON(props.color == LED_COLOR_ID_MULTI);
425
426 if (!led_classdev_name)
427 return -EINVAL;
428
429 led_parse_fwnode_props(dev, fwnode, &props);
430
431 if (props.label) {
432 /*
433 * If init_data.devicename is NULL, then it indicates that
434 * DT label should be used as-is for LED class device name.
435 * Otherwise the label is prepended with devicename to compose
436 * the final LED class device name.
437 */
438 if (!devicename) {
439 strscpy(led_classdev_name, props.label,
440 LED_MAX_NAME_SIZE);
441 } else {
442 snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
443 devicename, props.label);
444 }
445 } else if (props.function || props.color_present) {
446 char tmp_buf[LED_MAX_NAME_SIZE];
447
448 if (props.func_enum_present) {
449 snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d",
450 props.color_present ? led_colors[props.color] : "",
451 props.function ?: "", props.func_enum);
452 } else {
453 snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s",
454 props.color_present ? led_colors[props.color] : "",
455 props.function ?: "");
456 }
457 if (init_data->devname_mandatory) {
458 snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
459 devicename, tmp_buf);
460 } else {
461 strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE);
462
463 }
464 } else if (init_data->default_label) {
465 if (!devicename) {
466 dev_err(dev, "Legacy LED naming requires devicename segment");
467 return -EINVAL;
468 }
469 snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
470 devicename, init_data->default_label);
471 } else if (is_of_node(fwnode)) {
472 strscpy(led_classdev_name, to_of_node(fwnode)->name,
473 LED_MAX_NAME_SIZE);
474 } else
475 return -EINVAL;
476
477 return 0;
478}
479EXPORT_SYMBOL_GPL(led_compose_name);
480
481enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode)
482{
483 const char *state = NULL;
484
485 if (!fwnode_property_read_string(fwnode, "default-state", &state)) {
486 if (!strcmp(state, "keep"))
487 return LEDS_DEFSTATE_KEEP;
488 if (!strcmp(state, "on"))
489 return LEDS_DEFSTATE_ON;
490 }
491
492 return LEDS_DEFSTATE_OFF;
493}
494EXPORT_SYMBOL_GPL(led_init_default_state_get);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LED Class Core
4 *
5 * Copyright 2005-2006 Openedhand Ltd.
6 *
7 * Author: Richard Purdie <rpurdie@openedhand.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/leds.h>
12#include <linux/list.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/of.h>
16#include <linux/property.h>
17#include <linux/rwsem.h>
18#include <linux/slab.h>
19#include <uapi/linux/uleds.h>
20#include "leds.h"
21
22DECLARE_RWSEM(leds_list_lock);
23EXPORT_SYMBOL_GPL(leds_list_lock);
24
25LIST_HEAD(leds_list);
26EXPORT_SYMBOL_GPL(leds_list);
27
28const char * const led_colors[LED_COLOR_ID_MAX] = {
29 [LED_COLOR_ID_WHITE] = "white",
30 [LED_COLOR_ID_RED] = "red",
31 [LED_COLOR_ID_GREEN] = "green",
32 [LED_COLOR_ID_BLUE] = "blue",
33 [LED_COLOR_ID_AMBER] = "amber",
34 [LED_COLOR_ID_VIOLET] = "violet",
35 [LED_COLOR_ID_YELLOW] = "yellow",
36 [LED_COLOR_ID_IR] = "ir",
37 [LED_COLOR_ID_MULTI] = "multicolor",
38 [LED_COLOR_ID_RGB] = "rgb",
39};
40EXPORT_SYMBOL_GPL(led_colors);
41
42static int __led_set_brightness(struct led_classdev *led_cdev,
43 enum led_brightness value)
44{
45 if (!led_cdev->brightness_set)
46 return -ENOTSUPP;
47
48 led_cdev->brightness_set(led_cdev, value);
49
50 return 0;
51}
52
53static int __led_set_brightness_blocking(struct led_classdev *led_cdev,
54 enum led_brightness value)
55{
56 if (!led_cdev->brightness_set_blocking)
57 return -ENOTSUPP;
58
59 return led_cdev->brightness_set_blocking(led_cdev, value);
60}
61
62static void led_timer_function(struct timer_list *t)
63{
64 struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
65 unsigned long brightness;
66 unsigned long delay;
67
68 if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
69 led_set_brightness_nosleep(led_cdev, LED_OFF);
70 clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
71 return;
72 }
73
74 if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
75 &led_cdev->work_flags)) {
76 clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
77 return;
78 }
79
80 brightness = led_get_brightness(led_cdev);
81 if (!brightness) {
82 /* Time to switch the LED on. */
83 if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
84 &led_cdev->work_flags))
85 brightness = led_cdev->new_blink_brightness;
86 else
87 brightness = led_cdev->blink_brightness;
88 delay = led_cdev->blink_delay_on;
89 } else {
90 /* Store the current brightness value to be able
91 * to restore it when the delay_off period is over.
92 */
93 led_cdev->blink_brightness = brightness;
94 brightness = LED_OFF;
95 delay = led_cdev->blink_delay_off;
96 }
97
98 led_set_brightness_nosleep(led_cdev, brightness);
99
100 /* Return in next iteration if led is in one-shot mode and we are in
101 * the final blink state so that the led is toggled each delay_on +
102 * delay_off milliseconds in worst case.
103 */
104 if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
105 if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
106 if (brightness)
107 set_bit(LED_BLINK_ONESHOT_STOP,
108 &led_cdev->work_flags);
109 } else {
110 if (!brightness)
111 set_bit(LED_BLINK_ONESHOT_STOP,
112 &led_cdev->work_flags);
113 }
114 }
115
116 mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
117}
118
119static void set_brightness_delayed(struct work_struct *ws)
120{
121 struct led_classdev *led_cdev =
122 container_of(ws, struct led_classdev, set_brightness_work);
123 int ret = 0;
124
125 if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
126 led_cdev->delayed_set_value = LED_OFF;
127 led_stop_software_blink(led_cdev);
128 }
129
130 ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
131 if (ret == -ENOTSUPP)
132 ret = __led_set_brightness_blocking(led_cdev,
133 led_cdev->delayed_set_value);
134 if (ret < 0 &&
135 /* LED HW might have been unplugged, therefore don't warn */
136 !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) &&
137 (led_cdev->flags & LED_HW_PLUGGABLE)))
138 dev_err(led_cdev->dev,
139 "Setting an LED's brightness failed (%d)\n", ret);
140}
141
142static void led_set_software_blink(struct led_classdev *led_cdev,
143 unsigned long delay_on,
144 unsigned long delay_off)
145{
146 int current_brightness;
147
148 current_brightness = led_get_brightness(led_cdev);
149 if (current_brightness)
150 led_cdev->blink_brightness = current_brightness;
151 if (!led_cdev->blink_brightness)
152 led_cdev->blink_brightness = led_cdev->max_brightness;
153
154 led_cdev->blink_delay_on = delay_on;
155 led_cdev->blink_delay_off = delay_off;
156
157 /* never on - just set to off */
158 if (!delay_on) {
159 led_set_brightness_nosleep(led_cdev, LED_OFF);
160 return;
161 }
162
163 /* never off - just set to brightness */
164 if (!delay_off) {
165 led_set_brightness_nosleep(led_cdev,
166 led_cdev->blink_brightness);
167 return;
168 }
169
170 set_bit(LED_BLINK_SW, &led_cdev->work_flags);
171 mod_timer(&led_cdev->blink_timer, jiffies + 1);
172}
173
174
175static void led_blink_setup(struct led_classdev *led_cdev,
176 unsigned long *delay_on,
177 unsigned long *delay_off)
178{
179 if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
180 led_cdev->blink_set &&
181 !led_cdev->blink_set(led_cdev, delay_on, delay_off))
182 return;
183
184 /* blink with 1 Hz as default if nothing specified */
185 if (!*delay_on && !*delay_off)
186 *delay_on = *delay_off = 500;
187
188 led_set_software_blink(led_cdev, *delay_on, *delay_off);
189}
190
191void led_init_core(struct led_classdev *led_cdev)
192{
193 INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
194
195 timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
196}
197EXPORT_SYMBOL_GPL(led_init_core);
198
199void led_blink_set(struct led_classdev *led_cdev,
200 unsigned long *delay_on,
201 unsigned long *delay_off)
202{
203 del_timer_sync(&led_cdev->blink_timer);
204
205 clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
206 clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
207 clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
208
209 led_blink_setup(led_cdev, delay_on, delay_off);
210}
211EXPORT_SYMBOL_GPL(led_blink_set);
212
213void led_blink_set_oneshot(struct led_classdev *led_cdev,
214 unsigned long *delay_on,
215 unsigned long *delay_off,
216 int invert)
217{
218 if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
219 timer_pending(&led_cdev->blink_timer))
220 return;
221
222 set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
223 clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
224
225 if (invert)
226 set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
227 else
228 clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
229
230 led_blink_setup(led_cdev, delay_on, delay_off);
231}
232EXPORT_SYMBOL_GPL(led_blink_set_oneshot);
233
234void led_stop_software_blink(struct led_classdev *led_cdev)
235{
236 del_timer_sync(&led_cdev->blink_timer);
237 led_cdev->blink_delay_on = 0;
238 led_cdev->blink_delay_off = 0;
239 clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
240}
241EXPORT_SYMBOL_GPL(led_stop_software_blink);
242
243void led_set_brightness(struct led_classdev *led_cdev,
244 enum led_brightness brightness)
245{
246 /*
247 * If software blink is active, delay brightness setting
248 * until the next timer tick.
249 */
250 if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
251 /*
252 * If we need to disable soft blinking delegate this to the
253 * work queue task to avoid problems in case we are called
254 * from hard irq context.
255 */
256 if (brightness == LED_OFF) {
257 set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
258 schedule_work(&led_cdev->set_brightness_work);
259 } else {
260 set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
261 &led_cdev->work_flags);
262 led_cdev->new_blink_brightness = brightness;
263 }
264 return;
265 }
266
267 led_set_brightness_nosleep(led_cdev, brightness);
268}
269EXPORT_SYMBOL_GPL(led_set_brightness);
270
271void led_set_brightness_nopm(struct led_classdev *led_cdev,
272 enum led_brightness value)
273{
274 /* Use brightness_set op if available, it is guaranteed not to sleep */
275 if (!__led_set_brightness(led_cdev, value))
276 return;
277
278 /* If brightness setting can sleep, delegate it to a work queue task */
279 led_cdev->delayed_set_value = value;
280 schedule_work(&led_cdev->set_brightness_work);
281}
282EXPORT_SYMBOL_GPL(led_set_brightness_nopm);
283
284void led_set_brightness_nosleep(struct led_classdev *led_cdev,
285 enum led_brightness value)
286{
287 led_cdev->brightness = min(value, led_cdev->max_brightness);
288
289 if (led_cdev->flags & LED_SUSPENDED)
290 return;
291
292 led_set_brightness_nopm(led_cdev, led_cdev->brightness);
293}
294EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
295
296int led_set_brightness_sync(struct led_classdev *led_cdev,
297 enum led_brightness value)
298{
299 if (led_cdev->blink_delay_on || led_cdev->blink_delay_off)
300 return -EBUSY;
301
302 led_cdev->brightness = min(value, led_cdev->max_brightness);
303
304 if (led_cdev->flags & LED_SUSPENDED)
305 return 0;
306
307 return __led_set_brightness_blocking(led_cdev, led_cdev->brightness);
308}
309EXPORT_SYMBOL_GPL(led_set_brightness_sync);
310
311int led_update_brightness(struct led_classdev *led_cdev)
312{
313 int ret = 0;
314
315 if (led_cdev->brightness_get) {
316 ret = led_cdev->brightness_get(led_cdev);
317 if (ret >= 0) {
318 led_cdev->brightness = ret;
319 return 0;
320 }
321 }
322
323 return ret;
324}
325EXPORT_SYMBOL_GPL(led_update_brightness);
326
327u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)
328{
329 struct fwnode_handle *fwnode = led_cdev->dev->fwnode;
330 u32 *pattern;
331 int count;
332
333 count = fwnode_property_count_u32(fwnode, "led-pattern");
334 if (count < 0)
335 return NULL;
336
337 pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
338 if (!pattern)
339 return NULL;
340
341 if (fwnode_property_read_u32_array(fwnode, "led-pattern", pattern, count)) {
342 kfree(pattern);
343 return NULL;
344 }
345
346 *size = count;
347
348 return pattern;
349}
350EXPORT_SYMBOL_GPL(led_get_default_pattern);
351
352/* Caller must ensure led_cdev->led_access held */
353void led_sysfs_disable(struct led_classdev *led_cdev)
354{
355 lockdep_assert_held(&led_cdev->led_access);
356
357 led_cdev->flags |= LED_SYSFS_DISABLE;
358}
359EXPORT_SYMBOL_GPL(led_sysfs_disable);
360
361/* Caller must ensure led_cdev->led_access held */
362void led_sysfs_enable(struct led_classdev *led_cdev)
363{
364 lockdep_assert_held(&led_cdev->led_access);
365
366 led_cdev->flags &= ~LED_SYSFS_DISABLE;
367}
368EXPORT_SYMBOL_GPL(led_sysfs_enable);
369
370static void led_parse_fwnode_props(struct device *dev,
371 struct fwnode_handle *fwnode,
372 struct led_properties *props)
373{
374 int ret;
375
376 if (!fwnode)
377 return;
378
379 if (fwnode_property_present(fwnode, "label")) {
380 ret = fwnode_property_read_string(fwnode, "label", &props->label);
381 if (ret)
382 dev_err(dev, "Error parsing 'label' property (%d)\n", ret);
383 return;
384 }
385
386 if (fwnode_property_present(fwnode, "color")) {
387 ret = fwnode_property_read_u32(fwnode, "color", &props->color);
388 if (ret)
389 dev_err(dev, "Error parsing 'color' property (%d)\n", ret);
390 else if (props->color >= LED_COLOR_ID_MAX)
391 dev_err(dev, "LED color identifier out of range\n");
392 else
393 props->color_present = true;
394 }
395
396
397 if (!fwnode_property_present(fwnode, "function"))
398 return;
399
400 ret = fwnode_property_read_string(fwnode, "function", &props->function);
401 if (ret) {
402 dev_err(dev,
403 "Error parsing 'function' property (%d)\n",
404 ret);
405 }
406
407 if (!fwnode_property_present(fwnode, "function-enumerator"))
408 return;
409
410 ret = fwnode_property_read_u32(fwnode, "function-enumerator",
411 &props->func_enum);
412 if (ret) {
413 dev_err(dev,
414 "Error parsing 'function-enumerator' property (%d)\n",
415 ret);
416 } else {
417 props->func_enum_present = true;
418 }
419}
420
421int led_compose_name(struct device *dev, struct led_init_data *init_data,
422 char *led_classdev_name)
423{
424 struct led_properties props = {};
425 struct fwnode_handle *fwnode = init_data->fwnode;
426 const char *devicename = init_data->devicename;
427
428 /* We want to label LEDs that can produce full range of colors
429 * as RGB, not multicolor */
430 BUG_ON(props.color == LED_COLOR_ID_MULTI);
431
432 if (!led_classdev_name)
433 return -EINVAL;
434
435 led_parse_fwnode_props(dev, fwnode, &props);
436
437 if (props.label) {
438 /*
439 * If init_data.devicename is NULL, then it indicates that
440 * DT label should be used as-is for LED class device name.
441 * Otherwise the label is prepended with devicename to compose
442 * the final LED class device name.
443 */
444 if (!devicename) {
445 strscpy(led_classdev_name, props.label,
446 LED_MAX_NAME_SIZE);
447 } else {
448 snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
449 devicename, props.label);
450 }
451 } else if (props.function || props.color_present) {
452 char tmp_buf[LED_MAX_NAME_SIZE];
453
454 if (props.func_enum_present) {
455 snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d",
456 props.color_present ? led_colors[props.color] : "",
457 props.function ?: "", props.func_enum);
458 } else {
459 snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s",
460 props.color_present ? led_colors[props.color] : "",
461 props.function ?: "");
462 }
463 if (init_data->devname_mandatory) {
464 snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
465 devicename, tmp_buf);
466 } else {
467 strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE);
468
469 }
470 } else if (init_data->default_label) {
471 if (!devicename) {
472 dev_err(dev, "Legacy LED naming requires devicename segment");
473 return -EINVAL;
474 }
475 snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
476 devicename, init_data->default_label);
477 } else if (is_of_node(fwnode)) {
478 strscpy(led_classdev_name, to_of_node(fwnode)->name,
479 LED_MAX_NAME_SIZE);
480 } else
481 return -EINVAL;
482
483 return 0;
484}
485EXPORT_SYMBOL_GPL(led_compose_name);