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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * LED state routines for driver control interface
4 * Copyright (c) 2021 by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/slab.h>
8#include <linux/module.h>
9#include <linux/leds.h>
10#include <sound/core.h>
11#include <sound/control.h>
12
13MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
14MODULE_DESCRIPTION("ALSA control interface to LED trigger code.");
15MODULE_LICENSE("GPL");
16
17#define MAX_LED (((SNDRV_CTL_ELEM_ACCESS_MIC_LED - SNDRV_CTL_ELEM_ACCESS_SPK_LED) \
18 >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) + 1)
19
20#define to_led_card_dev(_dev) \
21 container_of(_dev, struct snd_ctl_led_card, dev)
22
23enum snd_ctl_led_mode {
24 MODE_FOLLOW_MUTE = 0,
25 MODE_FOLLOW_ROUTE,
26 MODE_OFF,
27 MODE_ON,
28};
29
30struct snd_ctl_led_card {
31 struct device dev;
32 int number;
33 struct snd_ctl_led *led;
34};
35
36struct snd_ctl_led {
37 struct device dev;
38 struct list_head controls;
39 const char *name;
40 unsigned int group;
41 enum led_audio trigger_type;
42 enum snd_ctl_led_mode mode;
43 struct snd_ctl_led_card *cards[SNDRV_CARDS];
44};
45
46struct snd_ctl_led_ctl {
47 struct list_head list;
48 struct snd_card *card;
49 unsigned int access;
50 struct snd_kcontrol *kctl;
51 unsigned int index_offset;
52};
53
54static DEFINE_MUTEX(snd_ctl_led_mutex);
55static bool snd_ctl_led_card_valid[SNDRV_CARDS];
56static struct snd_ctl_led snd_ctl_leds[MAX_LED] = {
57 {
58 .name = "speaker",
59 .group = (SNDRV_CTL_ELEM_ACCESS_SPK_LED >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1,
60 .trigger_type = LED_AUDIO_MUTE,
61 .mode = MODE_FOLLOW_MUTE,
62 },
63 {
64 .name = "mic",
65 .group = (SNDRV_CTL_ELEM_ACCESS_MIC_LED >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1,
66 .trigger_type = LED_AUDIO_MICMUTE,
67 .mode = MODE_FOLLOW_MUTE,
68 },
69};
70
71static void snd_ctl_led_sysfs_add(struct snd_card *card);
72static void snd_ctl_led_sysfs_remove(struct snd_card *card);
73
74#define UPDATE_ROUTE(route, cb) \
75 do { \
76 int route2 = (cb); \
77 if (route2 >= 0) \
78 route = route < 0 ? route2 : (route | route2); \
79 } while (0)
80
81static inline unsigned int access_to_group(unsigned int access)
82{
83 return ((access & SNDRV_CTL_ELEM_ACCESS_LED_MASK) >>
84 SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1;
85}
86
87static inline unsigned int group_to_access(unsigned int group)
88{
89 return (group + 1) << SNDRV_CTL_ELEM_ACCESS_LED_SHIFT;
90}
91
92static struct snd_ctl_led *snd_ctl_led_get_by_access(unsigned int access)
93{
94 unsigned int group = access_to_group(access);
95 if (group >= MAX_LED)
96 return NULL;
97 return &snd_ctl_leds[group];
98}
99
100/*
101 * A note for callers:
102 * The two static variables info and value are protected using snd_ctl_led_mutex.
103 */
104static int snd_ctl_led_get(struct snd_ctl_led_ctl *lctl)
105{
106 static struct snd_ctl_elem_info info;
107 static struct snd_ctl_elem_value value;
108 struct snd_kcontrol *kctl = lctl->kctl;
109 unsigned int i;
110 int result;
111
112 memset(&info, 0, sizeof(info));
113 info.id = kctl->id;
114 info.id.index += lctl->index_offset;
115 info.id.numid += lctl->index_offset;
116 result = kctl->info(kctl, &info);
117 if (result < 0)
118 return -1;
119 memset(&value, 0, sizeof(value));
120 value.id = info.id;
121 result = kctl->get(kctl, &value);
122 if (result < 0)
123 return -1;
124 if (info.type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
125 info.type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
126 for (i = 0; i < info.count; i++)
127 if (value.value.integer.value[i] != info.value.integer.min)
128 return 1;
129 } else if (info.type == SNDRV_CTL_ELEM_TYPE_INTEGER64) {
130 for (i = 0; i < info.count; i++)
131 if (value.value.integer64.value[i] != info.value.integer64.min)
132 return 1;
133 }
134 return 0;
135}
136
137static void snd_ctl_led_set_state(struct snd_card *card, unsigned int access,
138 struct snd_kcontrol *kctl, unsigned int ioff)
139{
140 struct snd_ctl_led *led;
141 struct snd_ctl_led_ctl *lctl;
142 int route;
143 bool found;
144
145 led = snd_ctl_led_get_by_access(access);
146 if (!led)
147 return;
148 route = -1;
149 found = false;
150 mutex_lock(&snd_ctl_led_mutex);
151 /* the card may not be registered (active) at this point */
152 if (card && !snd_ctl_led_card_valid[card->number]) {
153 mutex_unlock(&snd_ctl_led_mutex);
154 return;
155 }
156 list_for_each_entry(lctl, &led->controls, list) {
157 if (lctl->kctl == kctl && lctl->index_offset == ioff)
158 found = true;
159 UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
160 }
161 if (!found && kctl && card) {
162 lctl = kzalloc(sizeof(*lctl), GFP_KERNEL);
163 if (lctl) {
164 lctl->card = card;
165 lctl->access = access;
166 lctl->kctl = kctl;
167 lctl->index_offset = ioff;
168 list_add(&lctl->list, &led->controls);
169 UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
170 }
171 }
172 mutex_unlock(&snd_ctl_led_mutex);
173 switch (led->mode) {
174 case MODE_OFF: route = 1; break;
175 case MODE_ON: route = 0; break;
176 case MODE_FOLLOW_ROUTE: if (route >= 0) route ^= 1; break;
177 case MODE_FOLLOW_MUTE: /* noop */ break;
178 }
179 if (route >= 0)
180 ledtrig_audio_set(led->trigger_type, route ? LED_OFF : LED_ON);
181}
182
183static struct snd_ctl_led_ctl *snd_ctl_led_find(struct snd_kcontrol *kctl, unsigned int ioff)
184{
185 struct list_head *controls;
186 struct snd_ctl_led_ctl *lctl;
187 unsigned int group;
188
189 for (group = 0; group < MAX_LED; group++) {
190 controls = &snd_ctl_leds[group].controls;
191 list_for_each_entry(lctl, controls, list)
192 if (lctl->kctl == kctl && lctl->index_offset == ioff)
193 return lctl;
194 }
195 return NULL;
196}
197
198static unsigned int snd_ctl_led_remove(struct snd_kcontrol *kctl, unsigned int ioff,
199 unsigned int access)
200{
201 struct snd_ctl_led_ctl *lctl;
202 unsigned int ret = 0;
203
204 mutex_lock(&snd_ctl_led_mutex);
205 lctl = snd_ctl_led_find(kctl, ioff);
206 if (lctl && (access == 0 || access != lctl->access)) {
207 ret = lctl->access;
208 list_del(&lctl->list);
209 kfree(lctl);
210 }
211 mutex_unlock(&snd_ctl_led_mutex);
212 return ret;
213}
214
215static void snd_ctl_led_notify(struct snd_card *card, unsigned int mask,
216 struct snd_kcontrol *kctl, unsigned int ioff)
217{
218 struct snd_kcontrol_volatile *vd;
219 unsigned int access, access2;
220
221 if (mask == SNDRV_CTL_EVENT_MASK_REMOVE) {
222 access = snd_ctl_led_remove(kctl, ioff, 0);
223 if (access)
224 snd_ctl_led_set_state(card, access, NULL, 0);
225 } else if (mask & SNDRV_CTL_EVENT_MASK_INFO) {
226 vd = &kctl->vd[ioff];
227 access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
228 access2 = snd_ctl_led_remove(kctl, ioff, access);
229 if (access2)
230 snd_ctl_led_set_state(card, access2, NULL, 0);
231 if (access)
232 snd_ctl_led_set_state(card, access, kctl, ioff);
233 } else if ((mask & (SNDRV_CTL_EVENT_MASK_ADD |
234 SNDRV_CTL_EVENT_MASK_VALUE)) != 0) {
235 vd = &kctl->vd[ioff];
236 access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
237 if (access)
238 snd_ctl_led_set_state(card, access, kctl, ioff);
239 }
240}
241
242static int snd_ctl_led_set_id(int card_number, struct snd_ctl_elem_id *id,
243 unsigned int group, bool set)
244{
245 struct snd_card *card;
246 struct snd_kcontrol *kctl;
247 struct snd_kcontrol_volatile *vd;
248 unsigned int ioff, access, new_access;
249 int err = 0;
250
251 card = snd_card_ref(card_number);
252 if (card) {
253 down_write(&card->controls_rwsem);
254 kctl = snd_ctl_find_id(card, id);
255 if (kctl) {
256 ioff = snd_ctl_get_ioff(kctl, id);
257 vd = &kctl->vd[ioff];
258 access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
259 if (access != 0 && access != group_to_access(group)) {
260 err = -EXDEV;
261 goto unlock;
262 }
263 new_access = vd->access & ~SNDRV_CTL_ELEM_ACCESS_LED_MASK;
264 if (set)
265 new_access |= group_to_access(group);
266 if (new_access != vd->access) {
267 vd->access = new_access;
268 snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_INFO, kctl, ioff);
269 }
270 } else {
271 err = -ENOENT;
272 }
273unlock:
274 up_write(&card->controls_rwsem);
275 snd_card_unref(card);
276 } else {
277 err = -ENXIO;
278 }
279 return err;
280}
281
282static void snd_ctl_led_refresh(void)
283{
284 unsigned int group;
285
286 for (group = 0; group < MAX_LED; group++)
287 snd_ctl_led_set_state(NULL, group_to_access(group), NULL, 0);
288}
289
290static void snd_ctl_led_ctl_destroy(struct snd_ctl_led_ctl *lctl)
291{
292 list_del(&lctl->list);
293 kfree(lctl);
294}
295
296static void snd_ctl_led_clean(struct snd_card *card)
297{
298 unsigned int group;
299 struct snd_ctl_led *led;
300 struct snd_ctl_led_ctl *lctl;
301
302 for (group = 0; group < MAX_LED; group++) {
303 led = &snd_ctl_leds[group];
304repeat:
305 list_for_each_entry(lctl, &led->controls, list)
306 if (!card || lctl->card == card) {
307 snd_ctl_led_ctl_destroy(lctl);
308 goto repeat;
309 }
310 }
311}
312
313static int snd_ctl_led_reset(int card_number, unsigned int group)
314{
315 struct snd_card *card;
316 struct snd_ctl_led *led;
317 struct snd_ctl_led_ctl *lctl;
318 struct snd_kcontrol_volatile *vd;
319 bool change = false;
320
321 card = snd_card_ref(card_number);
322 if (!card)
323 return -ENXIO;
324
325 mutex_lock(&snd_ctl_led_mutex);
326 if (!snd_ctl_led_card_valid[card_number]) {
327 mutex_unlock(&snd_ctl_led_mutex);
328 snd_card_unref(card);
329 return -ENXIO;
330 }
331 led = &snd_ctl_leds[group];
332repeat:
333 list_for_each_entry(lctl, &led->controls, list)
334 if (lctl->card == card) {
335 vd = &lctl->kctl->vd[lctl->index_offset];
336 vd->access &= ~group_to_access(group);
337 snd_ctl_led_ctl_destroy(lctl);
338 change = true;
339 goto repeat;
340 }
341 mutex_unlock(&snd_ctl_led_mutex);
342 if (change)
343 snd_ctl_led_set_state(NULL, group_to_access(group), NULL, 0);
344 snd_card_unref(card);
345 return 0;
346}
347
348static void snd_ctl_led_register(struct snd_card *card)
349{
350 struct snd_kcontrol *kctl;
351 unsigned int ioff;
352
353 if (snd_BUG_ON(card->number < 0 ||
354 card->number >= ARRAY_SIZE(snd_ctl_led_card_valid)))
355 return;
356 mutex_lock(&snd_ctl_led_mutex);
357 snd_ctl_led_card_valid[card->number] = true;
358 mutex_unlock(&snd_ctl_led_mutex);
359 /* the register callback is already called with held card->controls_rwsem */
360 list_for_each_entry(kctl, &card->controls, list)
361 for (ioff = 0; ioff < kctl->count; ioff++)
362 snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, kctl, ioff);
363 snd_ctl_led_refresh();
364 snd_ctl_led_sysfs_add(card);
365}
366
367static void snd_ctl_led_disconnect(struct snd_card *card)
368{
369 snd_ctl_led_sysfs_remove(card);
370 mutex_lock(&snd_ctl_led_mutex);
371 snd_ctl_led_card_valid[card->number] = false;
372 snd_ctl_led_clean(card);
373 mutex_unlock(&snd_ctl_led_mutex);
374 snd_ctl_led_refresh();
375}
376
377static void snd_ctl_led_card_release(struct device *dev)
378{
379 struct snd_ctl_led_card *led_card = to_led_card_dev(dev);
380
381 kfree(led_card);
382}
383
384static void snd_ctl_led_release(struct device *dev)
385{
386}
387
388static void snd_ctl_led_dev_release(struct device *dev)
389{
390}
391
392/*
393 * sysfs
394 */
395
396static ssize_t mode_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
398{
399 struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
400 const char *str = NULL;
401
402 switch (led->mode) {
403 case MODE_FOLLOW_MUTE: str = "follow-mute"; break;
404 case MODE_FOLLOW_ROUTE: str = "follow-route"; break;
405 case MODE_ON: str = "on"; break;
406 case MODE_OFF: str = "off"; break;
407 }
408 return sprintf(buf, "%s\n", str);
409}
410
411static ssize_t mode_store(struct device *dev,
412 struct device_attribute *attr,
413 const char *buf, size_t count)
414{
415 struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
416 char _buf[16];
417 size_t l = min(count, sizeof(_buf) - 1);
418 enum snd_ctl_led_mode mode;
419
420 memcpy(_buf, buf, l);
421 _buf[l] = '\0';
422 if (strstr(_buf, "mute"))
423 mode = MODE_FOLLOW_MUTE;
424 else if (strstr(_buf, "route"))
425 mode = MODE_FOLLOW_ROUTE;
426 else if (strncmp(_buf, "off", 3) == 0 || strncmp(_buf, "0", 1) == 0)
427 mode = MODE_OFF;
428 else if (strncmp(_buf, "on", 2) == 0 || strncmp(_buf, "1", 1) == 0)
429 mode = MODE_ON;
430 else
431 return count;
432
433 mutex_lock(&snd_ctl_led_mutex);
434 led->mode = mode;
435 mutex_unlock(&snd_ctl_led_mutex);
436
437 snd_ctl_led_set_state(NULL, group_to_access(led->group), NULL, 0);
438 return count;
439}
440
441static ssize_t brightness_show(struct device *dev,
442 struct device_attribute *attr, char *buf)
443{
444 struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
445
446 return sprintf(buf, "%u\n", ledtrig_audio_get(led->trigger_type));
447}
448
449static DEVICE_ATTR_RW(mode);
450static DEVICE_ATTR_RO(brightness);
451
452static struct attribute *snd_ctl_led_dev_attrs[] = {
453 &dev_attr_mode.attr,
454 &dev_attr_brightness.attr,
455 NULL,
456};
457
458static const struct attribute_group snd_ctl_led_dev_attr_group = {
459 .attrs = snd_ctl_led_dev_attrs,
460};
461
462static const struct attribute_group *snd_ctl_led_dev_attr_groups[] = {
463 &snd_ctl_led_dev_attr_group,
464 NULL,
465};
466
467static char *find_eos(char *s)
468{
469 while (*s && *s != ',')
470 s++;
471 if (*s)
472 s++;
473 return s;
474}
475
476static char *parse_uint(char *s, unsigned int *val)
477{
478 unsigned long long res;
479 if (kstrtoull(s, 10, &res))
480 res = 0;
481 *val = res;
482 return find_eos(s);
483}
484
485static char *parse_string(char *s, char *val, size_t val_size)
486{
487 if (*s == '"' || *s == '\'') {
488 char c = *s;
489 s++;
490 while (*s && *s != c) {
491 if (val_size > 1) {
492 *val++ = *s;
493 val_size--;
494 }
495 s++;
496 }
497 } else {
498 while (*s && *s != ',') {
499 if (val_size > 1) {
500 *val++ = *s;
501 val_size--;
502 }
503 s++;
504 }
505 }
506 *val = '\0';
507 if (*s)
508 s++;
509 return s;
510}
511
512static char *parse_iface(char *s, unsigned int *val)
513{
514 if (!strncasecmp(s, "card", 4))
515 *val = SNDRV_CTL_ELEM_IFACE_CARD;
516 else if (!strncasecmp(s, "mixer", 5))
517 *val = SNDRV_CTL_ELEM_IFACE_MIXER;
518 return find_eos(s);
519}
520
521/*
522 * These types of input strings are accepted:
523 *
524 * unsigned integer - numid (equivaled to numid=UINT)
525 * string - basic mixer name (equivalent to iface=MIXER,name=STR)
526 * numid=UINT
527 * [iface=MIXER,][device=UINT,][subdevice=UINT,]name=STR[,index=UINT]
528 */
529static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, size_t count,
530 bool attach)
531{
532 char buf2[256], *s, *os;
533 size_t len = max(sizeof(s) - 1, count);
534 struct snd_ctl_elem_id id;
535 int err;
536
537 strncpy(buf2, buf, len);
538 buf2[len] = '\0';
539 memset(&id, 0, sizeof(id));
540 id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
541 s = buf2;
542 while (*s) {
543 os = s;
544 if (!strncasecmp(s, "numid=", 6)) {
545 s = parse_uint(s + 6, &id.numid);
546 } else if (!strncasecmp(s, "iface=", 6)) {
547 s = parse_iface(s + 6, &id.iface);
548 } else if (!strncasecmp(s, "device=", 7)) {
549 s = parse_uint(s + 7, &id.device);
550 } else if (!strncasecmp(s, "subdevice=", 10)) {
551 s = parse_uint(s + 10, &id.subdevice);
552 } else if (!strncasecmp(s, "name=", 5)) {
553 s = parse_string(s + 5, id.name, sizeof(id.name));
554 } else if (!strncasecmp(s, "index=", 6)) {
555 s = parse_uint(s + 6, &id.index);
556 } else if (s == buf2) {
557 while (*s) {
558 if (*s < '0' || *s > '9')
559 break;
560 s++;
561 }
562 if (*s == '\0')
563 parse_uint(buf2, &id.numid);
564 else {
565 for (; *s >= ' '; s++);
566 *s = '\0';
567 strlcpy(id.name, buf2, sizeof(id.name));
568 }
569 break;
570 }
571 if (*s == ',')
572 s++;
573 if (s == os)
574 break;
575 }
576
577 err = snd_ctl_led_set_id(led_card->number, &id, led_card->led->group, attach);
578 if (err < 0)
579 return err;
580
581 return count;
582}
583
584static ssize_t attach_store(struct device *dev,
585 struct device_attribute *attr,
586 const char *buf, size_t count)
587{
588 struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
589 return set_led_id(led_card, buf, count, true);
590}
591
592static ssize_t detach_store(struct device *dev,
593 struct device_attribute *attr,
594 const char *buf, size_t count)
595{
596 struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
597 return set_led_id(led_card, buf, count, false);
598}
599
600static ssize_t reset_store(struct device *dev,
601 struct device_attribute *attr,
602 const char *buf, size_t count)
603{
604 struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
605 int err;
606
607 if (count > 0 && buf[0] == '1') {
608 err = snd_ctl_led_reset(led_card->number, led_card->led->group);
609 if (err < 0)
610 return err;
611 }
612 return count;
613}
614
615static ssize_t list_show(struct device *dev,
616 struct device_attribute *attr, char *buf)
617{
618 struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
619 struct snd_card *card;
620 struct snd_ctl_led_ctl *lctl;
621 char *buf2 = buf;
622 size_t l;
623
624 card = snd_card_ref(led_card->number);
625 if (!card)
626 return -ENXIO;
627 down_read(&card->controls_rwsem);
628 mutex_lock(&snd_ctl_led_mutex);
629 if (snd_ctl_led_card_valid[led_card->number]) {
630 list_for_each_entry(lctl, &led_card->led->controls, list)
631 if (lctl->card == card) {
632 if (buf2 - buf > PAGE_SIZE - 16)
633 break;
634 if (buf2 != buf)
635 *buf2++ = ' ';
636 l = scnprintf(buf2, 15, "%u",
637 lctl->kctl->id.numid +
638 lctl->index_offset);
639 buf2[l] = '\0';
640 buf2 += l + 1;
641 }
642 }
643 mutex_unlock(&snd_ctl_led_mutex);
644 up_read(&card->controls_rwsem);
645 snd_card_unref(card);
646 return buf2 - buf;
647}
648
649static DEVICE_ATTR_WO(attach);
650static DEVICE_ATTR_WO(detach);
651static DEVICE_ATTR_WO(reset);
652static DEVICE_ATTR_RO(list);
653
654static struct attribute *snd_ctl_led_card_attrs[] = {
655 &dev_attr_attach.attr,
656 &dev_attr_detach.attr,
657 &dev_attr_reset.attr,
658 &dev_attr_list.attr,
659 NULL,
660};
661
662static const struct attribute_group snd_ctl_led_card_attr_group = {
663 .attrs = snd_ctl_led_card_attrs,
664};
665
666static const struct attribute_group *snd_ctl_led_card_attr_groups[] = {
667 &snd_ctl_led_card_attr_group,
668 NULL,
669};
670
671static struct device snd_ctl_led_dev;
672
673static void snd_ctl_led_sysfs_add(struct snd_card *card)
674{
675 unsigned int group;
676 struct snd_ctl_led_card *led_card;
677 struct snd_ctl_led *led;
678 char link_name[32];
679
680 for (group = 0; group < MAX_LED; group++) {
681 led = &snd_ctl_leds[group];
682 led_card = kzalloc(sizeof(*led_card), GFP_KERNEL);
683 if (!led_card)
684 goto cerr2;
685 led_card->number = card->number;
686 led_card->led = led;
687 device_initialize(&led_card->dev);
688 led_card->dev.release = snd_ctl_led_card_release;
689 if (dev_set_name(&led_card->dev, "card%d", card->number) < 0)
690 goto cerr;
691 led_card->dev.parent = &led->dev;
692 led_card->dev.groups = snd_ctl_led_card_attr_groups;
693 if (device_add(&led_card->dev))
694 goto cerr;
695 led->cards[card->number] = led_card;
696 snprintf(link_name, sizeof(link_name), "led-%s", led->name);
697 WARN(sysfs_create_link(&card->ctl_dev.kobj, &led_card->dev.kobj, link_name),
698 "can't create symlink to controlC%i device\n", card->number);
699 WARN(sysfs_create_link(&led_card->dev.kobj, &card->card_dev.kobj, "card"),
700 "can't create symlink to card%i\n", card->number);
701
702 continue;
703cerr:
704 put_device(&led_card->dev);
705cerr2:
706 printk(KERN_ERR "snd_ctl_led: unable to add card%d", card->number);
707 }
708}
709
710static void snd_ctl_led_sysfs_remove(struct snd_card *card)
711{
712 unsigned int group;
713 struct snd_ctl_led_card *led_card;
714 struct snd_ctl_led *led;
715 char link_name[32];
716
717 for (group = 0; group < MAX_LED; group++) {
718 led = &snd_ctl_leds[group];
719 led_card = led->cards[card->number];
720 if (!led_card)
721 continue;
722 snprintf(link_name, sizeof(link_name), "led-%s", led->name);
723 sysfs_remove_link(&card->ctl_dev.kobj, link_name);
724 sysfs_remove_link(&led_card->dev.kobj, "card");
725 device_unregister(&led_card->dev);
726 led->cards[card->number] = NULL;
727 }
728}
729
730/*
731 * Control layer registration
732 */
733static struct snd_ctl_layer_ops snd_ctl_led_lops = {
734 .module_name = SND_CTL_LAYER_MODULE_LED,
735 .lregister = snd_ctl_led_register,
736 .ldisconnect = snd_ctl_led_disconnect,
737 .lnotify = snd_ctl_led_notify,
738};
739
740static int __init snd_ctl_led_init(void)
741{
742 struct snd_ctl_led *led;
743 unsigned int group;
744
745 device_initialize(&snd_ctl_led_dev);
746 snd_ctl_led_dev.class = sound_class;
747 snd_ctl_led_dev.release = snd_ctl_led_dev_release;
748 dev_set_name(&snd_ctl_led_dev, "ctl-led");
749 if (device_add(&snd_ctl_led_dev)) {
750 put_device(&snd_ctl_led_dev);
751 return -ENOMEM;
752 }
753 for (group = 0; group < MAX_LED; group++) {
754 led = &snd_ctl_leds[group];
755 INIT_LIST_HEAD(&led->controls);
756 device_initialize(&led->dev);
757 led->dev.parent = &snd_ctl_led_dev;
758 led->dev.release = snd_ctl_led_release;
759 led->dev.groups = snd_ctl_led_dev_attr_groups;
760 dev_set_name(&led->dev, led->name);
761 if (device_add(&led->dev)) {
762 put_device(&led->dev);
763 for (; group > 0; group--) {
764 led = &snd_ctl_leds[group - 1];
765 device_unregister(&led->dev);
766 }
767 device_unregister(&snd_ctl_led_dev);
768 return -ENOMEM;
769 }
770 }
771 snd_ctl_register_layer(&snd_ctl_led_lops);
772 return 0;
773}
774
775static void __exit snd_ctl_led_exit(void)
776{
777 struct snd_ctl_led *led;
778 struct snd_card *card;
779 unsigned int group, card_number;
780
781 snd_ctl_disconnect_layer(&snd_ctl_led_lops);
782 for (card_number = 0; card_number < SNDRV_CARDS; card_number++) {
783 if (!snd_ctl_led_card_valid[card_number])
784 continue;
785 card = snd_card_ref(card_number);
786 if (card) {
787 snd_ctl_led_sysfs_remove(card);
788 snd_card_unref(card);
789 }
790 }
791 for (group = 0; group < MAX_LED; group++) {
792 led = &snd_ctl_leds[group];
793 device_unregister(&led->dev);
794 }
795 device_unregister(&snd_ctl_led_dev);
796 snd_ctl_led_clean(NULL);
797}
798
799module_init(snd_ctl_led_init)
800module_exit(snd_ctl_led_exit)