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ALSA: hda - Add sanity check for storing the user-defined pin configs
[linux-2.6-block.git] / sound / pci / hda / hda_hwdep.c
CommitLineData
2807314d
TI		 1/*
2 * HWDEP Interface for HD-audio codec
3 *
4 * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
5 *
6 * This driver is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This driver is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
2807314d
TI		 21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/pci.h>
24#include <linux/compat.h>
25#include <linux/mutex.h>
1e1be432 26#include <linux/ctype.h>
e7d2860b 27#include <linux/string.h>
4ea6fbc8 28#include <linux/firmware.h>
2807314d
TI		 29#include <sound/core.h>
30#include "hda_codec.h"
31#include "hda_local.h"
32#include <sound/hda_hwdep.h>
d7ffba19 33#include <sound/minors.h>
2807314d 34
43b62713
TI		 35/* hint string pair */
36struct hda_hint {
37 const char *key;
38 const char *val; /* contained in the same alloc as key */
39};
40
2807314d
TI		 41/*
42 * write/read an out-of-bound verb
43 */
44static int verb_write_ioctl(struct hda_codec *codec,
45 struct hda_verb_ioctl __user *arg)
46{
47 u32 verb, res;
48
49 if (get_user(verb, &arg->verb))
50 return -EFAULT;
51 res = snd_hda_codec_read(codec, verb >> 24, 0,
52 (verb >> 8) & 0xffff, verb & 0xff);
53 if (put_user(res, &arg->res))
54 return -EFAULT;
55 return 0;
56}
57
58static int get_wcap_ioctl(struct hda_codec *codec,
59 struct hda_verb_ioctl __user *arg)
60{
61 u32 verb, res;
62
63 if (get_user(verb, &arg->verb))
64 return -EFAULT;
65 res = get_wcaps(codec, verb >> 24);
66 if (put_user(res, &arg->res))
67 return -EFAULT;
68 return 0;
69}
70
71
72/*
73 */
74static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
75 unsigned int cmd, unsigned long arg)
76{
77 struct hda_codec *codec = hw->private_data;
78 void __user *argp = (void __user *)arg;
79
80 switch (cmd) {
81 case HDA_IOCTL_PVERSION:
82 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
83 case HDA_IOCTL_VERB_WRITE:
84 return verb_write_ioctl(codec, argp);
85 case HDA_IOCTL_GET_WCAP:
86 return get_wcap_ioctl(codec, argp);
87 }
88 return -ENOIOCTLCMD;
89}
90
91#ifdef CONFIG_COMPAT
92static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
93 unsigned int cmd, unsigned long arg)
94{
312d045c 95 return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
2807314d
TI		 96}
97#endif
98
99static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
100{
62cf872a 101#ifndef CONFIG_SND_DEBUG_VERBOSE
2807314d
TI		 102 if (!capable(CAP_SYS_RAWIO))
103 return -EACCES;
104#endif
105 return 0;
106}
107
11aeff08
TI		 108static void clear_hwdep_elements(struct hda_codec *codec)
109{
1e1be432
TI		 110 int i;
111
11aeff08
TI		 112 /* clear init verbs */
113 snd_array_free(&codec->init_verbs);
1e1be432 114 /* clear hints */
43b62713
TI		 115 for (i = 0; i < codec->hints.used; i++) {
116 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
117 kfree(hint->key); /* we don't need to free hint->val */
118 }
1e1be432 119 snd_array_free(&codec->hints);
346ff70f 120 snd_array_free(&codec->user_pins);
11aeff08
TI		 121}
122
123static void hwdep_free(struct snd_hwdep *hwdep)
124{
125 clear_hwdep_elements(hwdep->private_data);
126}
127
1289e9e8 128int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
2807314d
TI		 129{
130 char hwname[16];
131 struct snd_hwdep *hwdep;
132 int err;
133
134 sprintf(hwname, "HDA Codec %d", codec->addr);
135 err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
136 if (err < 0)
137 return err;
138 codec->hwdep = hwdep;
139 sprintf(hwdep->name, "HDA Codec %d", codec->addr);
140 hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
141 hwdep->private_data = codec;
11aeff08 142 hwdep->private_free = hwdep_free;
2807314d
TI		 143 hwdep->exclusive = 1;
144
145 hwdep->ops.open = hda_hwdep_open;
146 hwdep->ops.ioctl = hda_hwdep_ioctl;
147#ifdef CONFIG_COMPAT
148 hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
149#endif
150
11aeff08 151 snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
43b62713 152 snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
346ff70f 153 snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
11aeff08 154
2807314d
TI		 155 return 0;
156}
d7ffba19 157
a2f6309e
TI		 158#ifdef CONFIG_SND_HDA_POWER_SAVE
159static ssize_t power_on_acct_show(struct device *dev,
160 struct device_attribute *attr,
161 char *buf)
162{
163 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
164 struct hda_codec *codec = hwdep->private_data;
165 snd_hda_update_power_acct(codec);
166 return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
167}
168
169static ssize_t power_off_acct_show(struct device *dev,
170 struct device_attribute *attr,
171 char *buf)
172{
173 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
174 struct hda_codec *codec = hwdep->private_data;
175 snd_hda_update_power_acct(codec);
176 return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
177}
178
179static struct device_attribute power_attrs[] = {
180 __ATTR_RO(power_on_acct),
181 __ATTR_RO(power_off_acct),
182};
183
184int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec)
185{
186 struct snd_hwdep *hwdep = codec->hwdep;
187 int i;
188
189 for (i = 0; i < ARRAY_SIZE(power_attrs); i++)
190 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
191 hwdep->device, &power_attrs[i]);
192 return 0;
193}
194#endif /* CONFIG_SND_HDA_POWER_SAVE */
195
e7ee058c
TI		 196#ifdef CONFIG_SND_HDA_RECONFIG
197
d7ffba19
TI		 198/*
199 * sysfs interface
200 */
201
202static int clear_codec(struct hda_codec *codec)
203{
a65d629c
TI		 204 int err;
205
206 err = snd_hda_codec_reset(codec);
207 if (err < 0) {
208 snd_printk(KERN_ERR "The codec is being used, can't free.\n");
209 return err;
210 }
11aeff08 211 clear_hwdep_elements(codec);
d7ffba19
TI		 212 return 0;
213}
214
215static int reconfig_codec(struct hda_codec *codec)
216{
217 int err;
218
bb6ac72f 219 snd_hda_power_up(codec);
d7ffba19 220 snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
a65d629c
TI		 221 err = snd_hda_codec_reset(codec);
222 if (err < 0) {
223 snd_printk(KERN_ERR
224 "The codec is being used, can't reconfigure.\n");
bb6ac72f 225 goto error;
a65d629c 226 }
d7ffba19
TI		 227 err = snd_hda_codec_configure(codec);
228 if (err < 0)
bb6ac72f 229 goto error;
d7ffba19 230 /* rebuild PCMs */
529bd6c4 231 err = snd_hda_codec_build_pcms(codec);
d7ffba19 232 if (err < 0)
bb6ac72f 233 goto error;
d7ffba19
TI		 234 /* rebuild mixers */
235 err = snd_hda_codec_build_controls(codec);
236 if (err < 0)
bb6ac72f
TI		 237 goto error;
238 err = snd_card_register(codec->bus->card);
239 error:
240 snd_hda_power_down(codec);
241 return err;
d7ffba19
TI		 242}
243
244/*
245 * allocate a string at most len chars, and remove the trailing EOL
246 */
247static char *kstrndup_noeol(const char *src, size_t len)
248{
249 char *s = kstrndup(src, len, GFP_KERNEL);
250 char *p;
251 if (!s)
252 return NULL;
253 p = strchr(s, '\n');
254 if (p)
255 *p = 0;
256 return s;
257}
258
259#define CODEC_INFO_SHOW(type) \
260static ssize_t type##_show(struct device *dev, \
261 struct device_attribute *attr, \
262 char *buf) \
263{ \
264 struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
265 struct hda_codec *codec = hwdep->private_data; \
266 return sprintf(buf, "0x%x\n", codec->type); \
267}
268
269#define CODEC_INFO_STR_SHOW(type) \
270static ssize_t type##_show(struct device *dev, \
271 struct device_attribute *attr, \
272 char *buf) \
273{ \
274 struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
275 struct hda_codec *codec = hwdep->private_data; \
276 return sprintf(buf, "%s\n", \
277 codec->type ? codec->type : ""); \
278}
279
280CODEC_INFO_SHOW(vendor_id);
281CODEC_INFO_SHOW(subsystem_id);
282CODEC_INFO_SHOW(revision_id);
283CODEC_INFO_SHOW(afg);
284CODEC_INFO_SHOW(mfg);
812a2cca
TI		 285CODEC_INFO_STR_SHOW(vendor_name);
286CODEC_INFO_STR_SHOW(chip_name);
d7ffba19
TI		 287CODEC_INFO_STR_SHOW(modelname);
288
289#define CODEC_INFO_STORE(type) \
290static ssize_t type##_store(struct device *dev, \
291 struct device_attribute *attr, \
292 const char *buf, size_t count) \
293{ \
294 struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
295 struct hda_codec *codec = hwdep->private_data; \
296 char *after; \
297 codec->type = simple_strtoul(buf, &after, 0); \
298 return count; \
299}
300
301#define CODEC_INFO_STR_STORE(type) \
302static ssize_t type##_store(struct device *dev, \
303 struct device_attribute *attr, \
304 const char *buf, size_t count) \
305{ \
306 struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
307 struct hda_codec *codec = hwdep->private_data; \
308 char *s = kstrndup_noeol(buf, 64); \
309 if (!s) \
310 return -ENOMEM; \
311 kfree(codec->type); \
312 codec->type = s; \
313 return count; \
314}
315
316CODEC_INFO_STORE(vendor_id);
317CODEC_INFO_STORE(subsystem_id);
318CODEC_INFO_STORE(revision_id);
812a2cca
TI		 319CODEC_INFO_STR_STORE(vendor_name);
320CODEC_INFO_STR_STORE(chip_name);
d7ffba19
TI		 321CODEC_INFO_STR_STORE(modelname);
322
323#define CODEC_ACTION_STORE(type) \
324static ssize_t type##_store(struct device *dev, \
325 struct device_attribute *attr, \
326 const char *buf, size_t count) \
327{ \
328 struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
329 struct hda_codec *codec = hwdep->private_data; \
330 int err = 0; \
331 if (*buf) \
332 err = type##_codec(codec); \
333 return err < 0 ? err : count; \
334}
335
336CODEC_ACTION_STORE(reconfig);
337CODEC_ACTION_STORE(clear);
338
ab1726f9
TI		 339static ssize_t init_verbs_show(struct device *dev,
340 struct device_attribute *attr,
341 char *buf)
342{
343 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
344 struct hda_codec *codec = hwdep->private_data;
345 int i, len = 0;
346 for (i = 0; i < codec->init_verbs.used; i++) {
347 struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
348 len += snprintf(buf + len, PAGE_SIZE - len,
349 "0x%02x 0x%03x 0x%04x\n",
350 v->nid, v->verb, v->param);
351 }
352 return len;
353}
354
4ea6fbc8 355static int parse_init_verbs(struct hda_codec *codec, const char *buf)
11aeff08 356{
55290e19
TI		 357 struct hda_verb *v;
358 int nid, verb, param;
11aeff08 359
55290e19
TI		 360 if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
361 return -EINVAL;
362 if (!nid || !verb)
11aeff08
TI		 363 return -EINVAL;
364 v = snd_array_new(&codec->init_verbs);
365 if (!v)
366 return -ENOMEM;
55290e19
TI		 367 v->nid = nid;
368 v->verb = verb;
369 v->param = param;
4ea6fbc8
TI		 370 return 0;
371}
372
373static ssize_t init_verbs_store(struct device *dev,
374 struct device_attribute *attr,
375 const char *buf, size_t count)
376{
377 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
378 struct hda_codec *codec = hwdep->private_data;
379 int err = parse_init_verbs(codec, buf);
380 if (err < 0)
381 return err;
11aeff08
TI		 382 return count;
383}
384
ab1726f9
TI		 385static ssize_t hints_show(struct device *dev,
386 struct device_attribute *attr,
387 char *buf)
388{
389 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
390 struct hda_codec *codec = hwdep->private_data;
391 int i, len = 0;
392 for (i = 0; i < codec->hints.used; i++) {
393 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
394 len += snprintf(buf + len, PAGE_SIZE - len,
395 "%s = %s\n", hint->key, hint->val);
396 }
397 return len;
398}
399
43b62713
TI		 400static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
401{
402 int i;
403
404 for (i = 0; i < codec->hints.used; i++) {
405 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
406 if (!strcmp(hint->key, key))
407 return hint;
408 }
409 return NULL;
410}
411
412static void remove_trail_spaces(char *str)
413{
414 char *p;
415 if (!*str)
416 return;
417 p = str + strlen(str) - 1;
418 for (; isspace(*p); p--) {
419 *p = 0;
420 if (p == str)
421 return;
422 }
423}
424
425#define MAX_HINTS 1024
426
4ea6fbc8 427static int parse_hints(struct hda_codec *codec, const char *buf)
1e1be432 428{
43b62713
TI		 429 char *key, *val;
430 struct hda_hint *hint;
1e1be432 431
e7d2860b 432 buf = skip_spaces(buf);
43b62713 433 if (!*buf || *buf == '#' || *buf == '\n')
4ea6fbc8 434 return 0;
43b62713
TI		 435 if (*buf == '=')
436 return -EINVAL;
437 key = kstrndup_noeol(buf, 1024);
438 if (!key)
1e1be432 439 return -ENOMEM;
43b62713
TI		 440 /* extract key and val */
441 val = strchr(key, '=');
442 if (!val) {
443 kfree(key);
444 return -EINVAL;
445 }
446 *val++ = 0;
e7d2860b 447 val = skip_spaces(val);
43b62713
TI		 448 remove_trail_spaces(key);
449 remove_trail_spaces(val);
450 hint = get_hint(codec, key);
451 if (hint) {
452 /* replace */
453 kfree(hint->key);
454 hint->key = key;
455 hint->val = val;
4ea6fbc8 456 return 0;
43b62713
TI		 457 }
458 /* allocate a new hint entry */
459 if (codec->hints.used >= MAX_HINTS)
460 hint = NULL;
461 else
462 hint = snd_array_new(&codec->hints);
1e1be432 463 if (!hint) {
43b62713 464 kfree(key);
1e1be432
TI		 465 return -ENOMEM;
466 }
43b62713
TI		 467 hint->key = key;
468 hint->val = val;
4ea6fbc8
TI		 469 return 0;
470}
471
472static ssize_t hints_store(struct device *dev,
473 struct device_attribute *attr,
474 const char *buf, size_t count)
475{
476 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
477 struct hda_codec *codec = hwdep->private_data;
478 int err = parse_hints(codec, buf);
479 if (err < 0)
480 return err;
1e1be432
TI		 481 return count;
482}
483
3be14149
TI		 484static ssize_t pin_configs_show(struct hda_codec *codec,
485 struct snd_array *list,
486 char *buf)
487{
488 int i, len = 0;
489 for (i = 0; i < list->used; i++) {
490 struct hda_pincfg *pin = snd_array_elem(list, i);
491 len += sprintf(buf + len, "0x%02x 0x%08x\n",
492 pin->nid, pin->cfg);
493 }
494 return len;
495}
496
497static ssize_t init_pin_configs_show(struct device *dev,
498 struct device_attribute *attr,
499 char *buf)
500{
501 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
502 struct hda_codec *codec = hwdep->private_data;
503 return pin_configs_show(codec, &codec->init_pins, buf);
504}
505
346ff70f
TI		 506static ssize_t user_pin_configs_show(struct device *dev,
507 struct device_attribute *attr,
508 char *buf)
3be14149
TI		 509{
510 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
511 struct hda_codec *codec = hwdep->private_data;
346ff70f 512 return pin_configs_show(codec, &codec->user_pins, buf);
3be14149
TI		 513}
514
346ff70f
TI		 515static ssize_t driver_pin_configs_show(struct device *dev,
516 struct device_attribute *attr,
517 char *buf)
3be14149
TI		 518{
519 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
520 struct hda_codec *codec = hwdep->private_data;
346ff70f 521 return pin_configs_show(codec, &codec->driver_pins, buf);
3be14149
TI		 522}
523
524#define MAX_PIN_CONFIGS 32
525
4ea6fbc8 526static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
3be14149 527{
3be14149 528 int nid, cfg;
3be14149
TI		 529
530 if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
531 return -EINVAL;
532 if (!nid)
533 return -EINVAL;
4ea6fbc8
TI		 534 return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
535}
536
537static ssize_t user_pin_configs_store(struct device *dev,
538 struct device_attribute *attr,
539 const char *buf, size_t count)
540{
541 struct snd_hwdep *hwdep = dev_get_drvdata(dev);
542 struct hda_codec *codec = hwdep->private_data;
543 int err = parse_user_pin_configs(codec, buf);
3be14149
TI		 544 if (err < 0)
545 return err;
546 return count;
547}
548
d7ffba19
TI		 549#define CODEC_ATTR_RW(type) \
550 __ATTR(type, 0644, type##_show, type##_store)
551#define CODEC_ATTR_RO(type) \
552 __ATTR_RO(type)
553#define CODEC_ATTR_WO(type) \
554 __ATTR(type, 0200, NULL, type##_store)
555
556static struct device_attribute codec_attrs[] = {
557 CODEC_ATTR_RW(vendor_id),
558 CODEC_ATTR_RW(subsystem_id),
559 CODEC_ATTR_RW(revision_id),
560 CODEC_ATTR_RO(afg),
561 CODEC_ATTR_RO(mfg),
812a2cca
TI		 562 CODEC_ATTR_RW(vendor_name),
563 CODEC_ATTR_RW(chip_name),
d7ffba19 564 CODEC_ATTR_RW(modelname),
ab1726f9
TI		 565 CODEC_ATTR_RW(init_verbs),
566 CODEC_ATTR_RW(hints),
3be14149 567 CODEC_ATTR_RO(init_pin_configs),
346ff70f
TI		 568 CODEC_ATTR_RW(user_pin_configs),
569 CODEC_ATTR_RO(driver_pin_configs),
d7ffba19
TI		 570 CODEC_ATTR_WO(reconfig),
571 CODEC_ATTR_WO(clear),
572};
573
574/*
575 * create sysfs files on hwdep directory
576 */
577int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
578{
579 struct snd_hwdep *hwdep = codec->hwdep;
580 int i;
581
582 for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
583 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
584 hwdep->device, &codec_attrs[i]);
585 return 0;
586}
e7ee058c 587
43b62713
TI		 588/*
589 * Look for hint string
590 */
591const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
592{
593 struct hda_hint *hint = get_hint(codec, key);
594 return hint ? hint->val : NULL;
595}
596EXPORT_SYMBOL_HDA(snd_hda_get_hint);
597
598int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
599{
600 const char *p = snd_hda_get_hint(codec, key);
601 if (!p || !*p)
602 return -ENOENT;
603 switch (toupper(*p)) {
604 case 'T': /* true */
605 case 'Y': /* yes */
606 case '1':
607 return 1;
608 }
609 return 0;
610}
611EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);
612
e7ee058c 613#endif /* CONFIG_SND_HDA_RECONFIG */
4ea6fbc8
TI		 614
615#ifdef CONFIG_SND_HDA_PATCH_LOADER
616
617/* parser mode */
618enum {
619 LINE_MODE_NONE,
620 LINE_MODE_CODEC,
621 LINE_MODE_MODEL,
622 LINE_MODE_PINCFG,
623 LINE_MODE_VERB,
624 LINE_MODE_HINT,
625 NUM_LINE_MODES,
626};
627
628static inline int strmatch(const char *a, const char *b)
629{
630 return strnicmp(a, b, strlen(b)) == 0;
631}
632
633/* parse the contents after the line "[codec]"
634 * accept only the line with three numbers, and assign the current codec
635 */
636static void parse_codec_mode(char *buf, struct hda_bus *bus,
637 struct hda_codec **codecp)
638{
639 unsigned int vendorid, subid, caddr;
640 struct hda_codec *codec;
641
642 *codecp = NULL;
643 if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
644 list_for_each_entry(codec, &bus->codec_list, list) {
645 if (codec->addr == caddr) {
646 *codecp = codec;
647 break;
648 }
649 }
650 }
651}
652
653/* parse the contents after the other command tags, [pincfg], [verb],
654 * [hint] and [model]
655 * just pass to the sysfs helper (only when any codec was specified)
656 */
657static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
658 struct hda_codec **codecp)
659{
660 if (!*codecp)
661 return;
662 parse_user_pin_configs(*codecp, buf);
663}
664
665static void parse_verb_mode(char *buf, struct hda_bus *bus,
666 struct hda_codec **codecp)
667{
668 if (!*codecp)
669 return;
670 parse_init_verbs(*codecp, buf);
671}
672
673static void parse_hint_mode(char *buf, struct hda_bus *bus,
674 struct hda_codec **codecp)
675{
676 if (!*codecp)
677 return;
678 parse_hints(*codecp, buf);
679}
680
681static void parse_model_mode(char *buf, struct hda_bus *bus,
682 struct hda_codec **codecp)
683{
684 if (!*codecp)
685 return;
686 kfree((*codecp)->modelname);
687 (*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
688}
689
690struct hda_patch_item {
691 const char *tag;
692 void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
693};
694
695static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
696 [LINE_MODE_CODEC] = { "[codec]", parse_codec_mode },
697 [LINE_MODE_MODEL] = { "[model]", parse_model_mode },
698 [LINE_MODE_VERB] = { "[verb]", parse_verb_mode },
699 [LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode },
700 [LINE_MODE_HINT] = { "[hint]", parse_hint_mode },
701};
702
703/* check the line starting with '[' -- change the parser mode accodingly */
704static int parse_line_mode(char *buf, struct hda_bus *bus)
705{
706 int i;
707 for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
708 if (!patch_items[i].tag)
709 continue;
710 if (strmatch(buf, patch_items[i].tag))
711 return i;
712 }
713 return LINE_MODE_NONE;
714}
715
716/* copy one line from the buffer in fw, and update the fields in fw
717 * return zero if it reaches to the end of the buffer, or non-zero
718 * if successfully copied a line
719 *
720 * the spaces at the beginning and the end of the line are stripped
721 */
722static int get_line_from_fw(char *buf, int size, struct firmware *fw)
723{
724 int len;
725 const char *p = fw->data;
726 while (isspace(*p) && fw->size) {
727 p++;
728 fw->size--;
729 }
730 if (!fw->size)
731 return 0;
732 if (size < fw->size)
733 size = fw->size;
734
735 for (len = 0; len < fw->size; len++) {
736 if (!*p)
737 break;
738 if (*p == '\n') {
739 p++;
740 len++;
741 break;
742 }
743 if (len < size)
744 *buf++ = *p++;
745 }
746 *buf = 0;
747 fw->size -= len;
748 fw->data = p;
749 remove_trail_spaces(buf);
750 return 1;
751}
752
753/*
754 * load a "patch" firmware file and parse it
755 */
756int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
757{
758 int err;
759 const struct firmware *fw;
760 struct firmware tmp;
761 char buf[128];
762 struct hda_codec *codec;
763 int line_mode;
764 struct device *dev = bus->card->dev;
765
766 if (snd_BUG_ON(!dev))
767 return -ENODEV;
768 err = request_firmware(&fw, patch, dev);
769 if (err < 0) {
770 printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
771 patch);
772 return err;
773 }
774
775 tmp = *fw;
776 line_mode = LINE_MODE_NONE;
777 codec = NULL;
778 while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
779 if (!*buf || *buf == '#' || *buf == '\n')
780 continue;
781 if (*buf == '[')
782 line_mode = parse_line_mode(buf, bus);
783 else if (patch_items[line_mode].parser)
784 patch_items[line_mode].parser(buf, bus, &codec);
785 }
786 release_firmware(fw);
787 return 0;
788}
789EXPORT_SYMBOL_HDA(snd_hda_load_patch);
790#endif /* CONFIG_SND_HDA_PATCH_LOADER */
Linux 6.x block layer and io_uring tree(s)