72e5885007ccfa39887389f644bd06fa1c77bcd2
[linux-2.6.git] / sound / pci / hda / hda_hwdep.c
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
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>
26 #include <linux/ctype.h>
27 #include <linux/string.h>
28 #include <linux/firmware.h>
29 #include <sound/core.h>
30 #include "hda_codec.h"
31 #include "hda_local.h"
32 #include <sound/hda_hwdep.h>
33 #include <sound/minors.h>
34
35 /* hint string pair */
36 struct hda_hint {
37         const char *key;
38         const char *val;        /* contained in the same alloc as key */
39 };
40
41 /*
42  * write/read an out-of-bound verb
43  */
44 static 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
58 static 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  */
74 static 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
92 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
93                                   unsigned int cmd, unsigned long arg)
94 {
95         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
96 }
97 #endif
98
99 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
100 {
101 #ifndef CONFIG_SND_DEBUG_VERBOSE
102         if (!capable(CAP_SYS_RAWIO))
103                 return -EACCES;
104 #endif
105         return 0;
106 }
107
108 static void clear_hwdep_elements(struct hda_codec *codec)
109 {
110         int i;
111
112         /* clear init verbs */
113         snd_array_free(&codec->init_verbs);
114         /* clear hints */
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         }
119         snd_array_free(&codec->hints);
120         snd_array_free(&codec->user_pins);
121 }
122
123 static void hwdep_free(struct snd_hwdep *hwdep)
124 {
125         clear_hwdep_elements(hwdep->private_data);
126 }
127
128 int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
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;
142         hwdep->private_free = hwdep_free;
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
151         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
152         snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
153         snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
154
155         return 0;
156 }
157
158 #ifdef CONFIG_SND_HDA_POWER_SAVE
159 static 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
169 static 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
179 static struct device_attribute power_attrs[] = {
180         __ATTR_RO(power_on_acct),
181         __ATTR_RO(power_off_acct),
182 };
183
184 int 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
196 #ifdef CONFIG_SND_HDA_RECONFIG
197
198 /*
199  * sysfs interface
200  */
201
202 static int clear_codec(struct hda_codec *codec)
203 {
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         }
211         clear_hwdep_elements(codec);
212         return 0;
213 }
214
215 static int reconfig_codec(struct hda_codec *codec)
216 {
217         int err;
218
219         snd_hda_power_up(codec);
220         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
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");
225                 goto error;
226         }
227         err = snd_hda_codec_configure(codec);
228         if (err < 0)
229                 goto error;
230         /* rebuild PCMs */
231         err = snd_hda_codec_build_pcms(codec);
232         if (err < 0)
233                 goto error;
234         /* rebuild mixers */
235         err = snd_hda_codec_build_controls(codec);
236         if (err < 0)
237                 goto error;
238         err = snd_card_register(codec->bus->card);
239  error:
240         snd_hda_power_down(codec);
241         return err;
242 }
243
244 /*
245  * allocate a string at most len chars, and remove the trailing EOL
246  */
247 static 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)                                   \
260 static 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)                               \
270 static 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
280 CODEC_INFO_SHOW(vendor_id);
281 CODEC_INFO_SHOW(subsystem_id);
282 CODEC_INFO_SHOW(revision_id);
283 CODEC_INFO_SHOW(afg);
284 CODEC_INFO_SHOW(mfg);
285 CODEC_INFO_STR_SHOW(vendor_name);
286 CODEC_INFO_STR_SHOW(chip_name);
287 CODEC_INFO_STR_SHOW(modelname);
288
289 #define CODEC_INFO_STORE(type)                                  \
290 static 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         unsigned long val;                                      \
297         int err = strict_strtoul(buf, 0, &val);                 \
298         if (err < 0)                                            \
299                 return err;                                     \
300         codec->type = val;                                      \
301         return count;                                           \
302 }
303
304 #define CODEC_INFO_STR_STORE(type)                              \
305 static ssize_t type##_store(struct device *dev,                 \
306                             struct device_attribute *attr,      \
307                             const char *buf, size_t count)      \
308 {                                                               \
309         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
310         struct hda_codec *codec = hwdep->private_data;          \
311         char *s = kstrndup_noeol(buf, 64);                      \
312         if (!s)                                                 \
313                 return -ENOMEM;                                 \
314         kfree(codec->type);                                     \
315         codec->type = s;                                        \
316         return count;                                           \
317 }
318
319 CODEC_INFO_STORE(vendor_id);
320 CODEC_INFO_STORE(subsystem_id);
321 CODEC_INFO_STORE(revision_id);
322 CODEC_INFO_STR_STORE(vendor_name);
323 CODEC_INFO_STR_STORE(chip_name);
324 CODEC_INFO_STR_STORE(modelname);
325
326 #define CODEC_ACTION_STORE(type)                                \
327 static ssize_t type##_store(struct device *dev,                 \
328                             struct device_attribute *attr,      \
329                             const char *buf, size_t count)      \
330 {                                                               \
331         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
332         struct hda_codec *codec = hwdep->private_data;          \
333         int err = 0;                                            \
334         if (*buf)                                               \
335                 err = type##_codec(codec);                      \
336         return err < 0 ? err : count;                           \
337 }
338
339 CODEC_ACTION_STORE(reconfig);
340 CODEC_ACTION_STORE(clear);
341
342 static ssize_t init_verbs_show(struct device *dev,
343                                struct device_attribute *attr,
344                                char *buf)
345 {
346         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
347         struct hda_codec *codec = hwdep->private_data;
348         int i, len = 0;
349         for (i = 0; i < codec->init_verbs.used; i++) {
350                 struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
351                 len += snprintf(buf + len, PAGE_SIZE - len,
352                                 "0x%02x 0x%03x 0x%04x\n",
353                                 v->nid, v->verb, v->param);
354         }
355         return len;
356 }
357
358 static int parse_init_verbs(struct hda_codec *codec, const char *buf)
359 {
360         struct hda_verb *v;
361         int nid, verb, param;
362
363         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
364                 return -EINVAL;
365         if (!nid || !verb)
366                 return -EINVAL;
367         v = snd_array_new(&codec->init_verbs);
368         if (!v)
369                 return -ENOMEM;
370         v->nid = nid;
371         v->verb = verb;
372         v->param = param;
373         return 0;
374 }
375
376 static ssize_t init_verbs_store(struct device *dev,
377                                 struct device_attribute *attr,
378                                 const char *buf, size_t count)
379 {
380         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
381         struct hda_codec *codec = hwdep->private_data;
382         int err = parse_init_verbs(codec, buf);
383         if (err < 0)
384                 return err;
385         return count;
386 }
387
388 static ssize_t hints_show(struct device *dev,
389                           struct device_attribute *attr,
390                           char *buf)
391 {
392         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
393         struct hda_codec *codec = hwdep->private_data;
394         int i, len = 0;
395         for (i = 0; i < codec->hints.used; i++) {
396                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
397                 len += snprintf(buf + len, PAGE_SIZE - len,
398                                 "%s = %s\n", hint->key, hint->val);
399         }
400         return len;
401 }
402
403 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
404 {
405         int i;
406
407         for (i = 0; i < codec->hints.used; i++) {
408                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
409                 if (!strcmp(hint->key, key))
410                         return hint;
411         }
412         return NULL;
413 }
414
415 static void remove_trail_spaces(char *str)
416 {
417         char *p;
418         if (!*str)
419                 return;
420         p = str + strlen(str) - 1;
421         for (; isspace(*p); p--) {
422                 *p = 0;
423                 if (p == str)
424                         return;
425         }
426 }
427
428 #define MAX_HINTS       1024
429
430 static int parse_hints(struct hda_codec *codec, const char *buf)
431 {
432         char *key, *val;
433         struct hda_hint *hint;
434
435         buf = skip_spaces(buf);
436         if (!*buf || *buf == '#' || *buf == '\n')
437                 return 0;
438         if (*buf == '=')
439                 return -EINVAL;
440         key = kstrndup_noeol(buf, 1024);
441         if (!key)
442                 return -ENOMEM;
443         /* extract key and val */
444         val = strchr(key, '=');
445         if (!val) {
446                 kfree(key);
447                 return -EINVAL;
448         }
449         *val++ = 0;
450         val = skip_spaces(val);
451         remove_trail_spaces(key);
452         remove_trail_spaces(val);
453         hint = get_hint(codec, key);
454         if (hint) {
455                 /* replace */
456                 kfree(hint->key);
457                 hint->key = key;
458                 hint->val = val;
459                 return 0;
460         }
461         /* allocate a new hint entry */
462         if (codec->hints.used >= MAX_HINTS)
463                 hint = NULL;
464         else
465                 hint = snd_array_new(&codec->hints);
466         if (!hint) {
467                 kfree(key);
468                 return -ENOMEM;
469         }
470         hint->key = key;
471         hint->val = val;
472         return 0;
473 }
474
475 static ssize_t hints_store(struct device *dev,
476                            struct device_attribute *attr,
477                            const char *buf, size_t count)
478 {
479         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
480         struct hda_codec *codec = hwdep->private_data;
481         int err = parse_hints(codec, buf);
482         if (err < 0)
483                 return err;
484         return count;
485 }
486
487 static ssize_t pin_configs_show(struct hda_codec *codec,
488                                 struct snd_array *list,
489                                 char *buf)
490 {
491         int i, len = 0;
492         for (i = 0; i < list->used; i++) {
493                 struct hda_pincfg *pin = snd_array_elem(list, i);
494                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
495                                pin->nid, pin->cfg);
496         }
497         return len;
498 }
499
500 static ssize_t init_pin_configs_show(struct device *dev,
501                                      struct device_attribute *attr,
502                                      char *buf)
503 {
504         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
505         struct hda_codec *codec = hwdep->private_data;
506         return pin_configs_show(codec, &codec->init_pins, buf);
507 }
508
509 static ssize_t user_pin_configs_show(struct device *dev,
510                                      struct device_attribute *attr,
511                                      char *buf)
512 {
513         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
514         struct hda_codec *codec = hwdep->private_data;
515         return pin_configs_show(codec, &codec->user_pins, buf);
516 }
517
518 static ssize_t driver_pin_configs_show(struct device *dev,
519                                        struct device_attribute *attr,
520                                        char *buf)
521 {
522         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
523         struct hda_codec *codec = hwdep->private_data;
524         return pin_configs_show(codec, &codec->driver_pins, buf);
525 }
526
527 #define MAX_PIN_CONFIGS         32
528
529 static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
530 {
531         int nid, cfg;
532
533         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
534                 return -EINVAL;
535         if (!nid)
536                 return -EINVAL;
537         return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
538 }
539
540 static ssize_t user_pin_configs_store(struct device *dev,
541                                       struct device_attribute *attr,
542                                       const char *buf, size_t count)
543 {
544         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
545         struct hda_codec *codec = hwdep->private_data;
546         int err = parse_user_pin_configs(codec, buf);
547         if (err < 0)
548                 return err;
549         return count;
550 }
551
552 #define CODEC_ATTR_RW(type) \
553         __ATTR(type, 0644, type##_show, type##_store)
554 #define CODEC_ATTR_RO(type) \
555         __ATTR_RO(type)
556 #define CODEC_ATTR_WO(type) \
557         __ATTR(type, 0200, NULL, type##_store)
558
559 static struct device_attribute codec_attrs[] = {
560         CODEC_ATTR_RW(vendor_id),
561         CODEC_ATTR_RW(subsystem_id),
562         CODEC_ATTR_RW(revision_id),
563         CODEC_ATTR_RO(afg),
564         CODEC_ATTR_RO(mfg),
565         CODEC_ATTR_RW(vendor_name),
566         CODEC_ATTR_RW(chip_name),
567         CODEC_ATTR_RW(modelname),
568         CODEC_ATTR_RW(init_verbs),
569         CODEC_ATTR_RW(hints),
570         CODEC_ATTR_RO(init_pin_configs),
571         CODEC_ATTR_RW(user_pin_configs),
572         CODEC_ATTR_RO(driver_pin_configs),
573         CODEC_ATTR_WO(reconfig),
574         CODEC_ATTR_WO(clear),
575 };
576
577 /*
578  * create sysfs files on hwdep directory
579  */
580 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
581 {
582         struct snd_hwdep *hwdep = codec->hwdep;
583         int i;
584
585         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
586                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
587                                           hwdep->device, &codec_attrs[i]);
588         return 0;
589 }
590
591 /*
592  * Look for hint string
593  */
594 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
595 {
596         struct hda_hint *hint = get_hint(codec, key);
597         return hint ? hint->val : NULL;
598 }
599 EXPORT_SYMBOL_HDA(snd_hda_get_hint);
600
601 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
602 {
603         const char *p = snd_hda_get_hint(codec, key);
604         if (!p || !*p)
605                 return -ENOENT;
606         switch (toupper(*p)) {
607         case 'T': /* true */
608         case 'Y': /* yes */
609         case '1':
610                 return 1;
611         }
612         return 0;
613 }
614 EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);
615
616 #endif /* CONFIG_SND_HDA_RECONFIG */
617
618 #ifdef CONFIG_SND_HDA_PATCH_LOADER
619
620 /* parser mode */
621 enum {
622         LINE_MODE_NONE,
623         LINE_MODE_CODEC,
624         LINE_MODE_MODEL,
625         LINE_MODE_PINCFG,
626         LINE_MODE_VERB,
627         LINE_MODE_HINT,
628         LINE_MODE_VENDOR_ID,
629         LINE_MODE_SUBSYSTEM_ID,
630         LINE_MODE_REVISION_ID,
631         LINE_MODE_CHIP_NAME,
632         NUM_LINE_MODES,
633 };
634
635 static inline int strmatch(const char *a, const char *b)
636 {
637         return strnicmp(a, b, strlen(b)) == 0;
638 }
639
640 /* parse the contents after the line "[codec]"
641  * accept only the line with three numbers, and assign the current codec
642  */
643 static void parse_codec_mode(char *buf, struct hda_bus *bus,
644                              struct hda_codec **codecp)
645 {
646         int vendorid, subid, caddr;
647         struct hda_codec *codec;
648
649         *codecp = NULL;
650         if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
651                 list_for_each_entry(codec, &bus->codec_list, list) {
652                         if ((vendorid <= 0 || codec->vendor_id == vendorid) &&
653                             (subid <= 0 || codec->subsystem_id == subid) &&
654                             codec->addr == caddr) {
655                                 *codecp = codec;
656                                 break;
657                         }
658                 }
659         }
660 }
661
662 /* parse the contents after the other command tags, [pincfg], [verb],
663  * [vendor_id], [subsystem_id], [revision_id], [chip_name], [hint] and [model]
664  * just pass to the sysfs helper (only when any codec was specified)
665  */
666 static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
667                               struct hda_codec **codecp)
668 {
669         parse_user_pin_configs(*codecp, buf);
670 }
671
672 static void parse_verb_mode(char *buf, struct hda_bus *bus,
673                             struct hda_codec **codecp)
674 {
675         parse_init_verbs(*codecp, buf);
676 }
677
678 static void parse_hint_mode(char *buf, struct hda_bus *bus,
679                             struct hda_codec **codecp)
680 {
681         parse_hints(*codecp, buf);
682 }
683
684 static void parse_model_mode(char *buf, struct hda_bus *bus,
685                              struct hda_codec **codecp)
686 {
687         kfree((*codecp)->modelname);
688         (*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
689 }
690
691 static void parse_chip_name_mode(char *buf, struct hda_bus *bus,
692                                  struct hda_codec **codecp)
693 {
694         kfree((*codecp)->chip_name);
695         (*codecp)->chip_name = kstrdup(buf, GFP_KERNEL);
696 }
697
698 #define DEFINE_PARSE_ID_MODE(name) \
699 static void parse_##name##_mode(char *buf, struct hda_bus *bus, \
700                                  struct hda_codec **codecp) \
701 { \
702         unsigned long val; \
703         if (!strict_strtoul(buf, 0, &val)) \
704                 (*codecp)->name = val; \
705 }
706
707 DEFINE_PARSE_ID_MODE(vendor_id);
708 DEFINE_PARSE_ID_MODE(subsystem_id);
709 DEFINE_PARSE_ID_MODE(revision_id);
710
711
712 struct hda_patch_item {
713         const char *tag;
714         void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
715         int need_codec;
716 };
717
718 static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
719         [LINE_MODE_CODEC] = { "[codec]", parse_codec_mode, 0 },
720         [LINE_MODE_MODEL] = { "[model]", parse_model_mode, 1 },
721         [LINE_MODE_VERB] = { "[verb]", parse_verb_mode, 1 },
722         [LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode, 1 },
723         [LINE_MODE_HINT] = { "[hint]", parse_hint_mode, 1 },
724         [LINE_MODE_VENDOR_ID] = { "[vendor_id]", parse_vendor_id_mode, 1 },
725         [LINE_MODE_SUBSYSTEM_ID] = { "[subsystem_id]", parse_subsystem_id_mode, 1 },
726         [LINE_MODE_REVISION_ID] = { "[revision_id]", parse_revision_id_mode, 1 },
727         [LINE_MODE_CHIP_NAME] = { "[chip_name]", parse_chip_name_mode, 1 },
728 };
729
730 /* check the line starting with '[' -- change the parser mode accodingly */
731 static int parse_line_mode(char *buf, struct hda_bus *bus)
732 {
733         int i;
734         for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
735                 if (!patch_items[i].tag)
736                         continue;
737                 if (strmatch(buf, patch_items[i].tag))
738                         return i;
739         }
740         return LINE_MODE_NONE;
741 }
742
743 /* copy one line from the buffer in fw, and update the fields in fw
744  * return zero if it reaches to the end of the buffer, or non-zero
745  * if successfully copied a line
746  *
747  * the spaces at the beginning and the end of the line are stripped
748  */
749 static int get_line_from_fw(char *buf, int size, struct firmware *fw)
750 {
751         int len;
752         const char *p = fw->data;
753         while (isspace(*p) && fw->size) {
754                 p++;
755                 fw->size--;
756         }
757         if (!fw->size)
758                 return 0;
759         if (size < fw->size)
760                 size = fw->size;
761
762         for (len = 0; len < fw->size; len++) {
763                 if (!*p)
764                         break;
765                 if (*p == '\n') {
766                         p++;
767                         len++;
768                         break;
769                 }
770                 if (len < size)
771                         *buf++ = *p++;
772         }
773         *buf = 0;
774         fw->size -= len;
775         fw->data = p;
776         remove_trail_spaces(buf);
777         return 1;
778 }
779
780 /*
781  * load a "patch" firmware file and parse it
782  */
783 int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
784 {
785         int err;
786         const struct firmware *fw;
787         struct firmware tmp;
788         char buf[128];
789         struct hda_codec *codec;
790         int line_mode;
791         struct device *dev = bus->card->dev;
792
793         if (snd_BUG_ON(!dev))
794                 return -ENODEV;
795         err = request_firmware(&fw, patch, dev);
796         if (err < 0) {
797                 printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
798                        patch);
799                 return err;
800         }
801
802         tmp = *fw;
803         line_mode = LINE_MODE_NONE;
804         codec = NULL;
805         while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
806                 if (!*buf || *buf == '#' || *buf == '\n')
807                         continue;
808                 if (*buf == '[')
809                         line_mode = parse_line_mode(buf, bus);
810                 else if (patch_items[line_mode].parser &&
811                          (codec || !patch_items[line_mode].need_codec))
812                         patch_items[line_mode].parser(buf, bus, &codec);
813         }
814         release_firmware(fw);
815         return 0;
816 }
817 EXPORT_SYMBOL_HDA(snd_hda_load_patch);
818 #endif /* CONFIG_SND_HDA_PATCH_LOADER */