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writeback: add comments to bdi_work structure
[linux-2.6/next.git] / sound / pci / hda / hda_eld.c
blob9446a5abea1314da3888ca586594010cabea4cc4
1 /*
2 * Generic routines and proc interface for ELD(EDID Like Data) information
3 *
4 * Copyright(c) 2008 Intel Corporation.
5 *
6 * Authors:
7 * Wu Fengguang <wfg@linux.intel.com>
8 *
9 * This driver is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This driver is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include <linux/init.h>
25 #include <sound/core.h>
26 #include <asm/unaligned.h>
27 #include "hda_codec.h"
28 #include "hda_local.h"
29
30 enum eld_versions {
31 ELD_VER_CEA_861D = 2,
32 ELD_VER_PARTIAL = 31,
33 };
34
35 enum cea_edid_versions {
36 CEA_EDID_VER_NONE = 0,
37 CEA_EDID_VER_CEA861 = 1,
38 CEA_EDID_VER_CEA861A = 2,
39 CEA_EDID_VER_CEA861BCD = 3,
40 CEA_EDID_VER_RESERVED = 4,
41 };
42
43 static char *cea_speaker_allocation_names[] = {
44 /* 0 */ "FL/FR",
45 /* 1 */ "LFE",
46 /* 2 */ "FC",
47 /* 3 */ "RL/RR",
48 /* 4 */ "RC",
49 /* 5 */ "FLC/FRC",
50 /* 6 */ "RLC/RRC",
51 /* 7 */ "FLW/FRW",
52 /* 8 */ "FLH/FRH",
53 /* 9 */ "TC",
54 /* 10 */ "FCH",
55 };
56
57 static char *eld_connection_type_names[4] = {
58 "HDMI",
59 "DisplayPort",
60 "2-reserved",
61 "3-reserved"
62 };
63
64 enum cea_audio_coding_types {
65 AUDIO_CODING_TYPE_REF_STREAM_HEADER = 0,
66 AUDIO_CODING_TYPE_LPCM = 1,
67 AUDIO_CODING_TYPE_AC3 = 2,
68 AUDIO_CODING_TYPE_MPEG1 = 3,
69 AUDIO_CODING_TYPE_MP3 = 4,
70 AUDIO_CODING_TYPE_MPEG2 = 5,
71 AUDIO_CODING_TYPE_AACLC = 6,
72 AUDIO_CODING_TYPE_DTS = 7,
73 AUDIO_CODING_TYPE_ATRAC = 8,
74 AUDIO_CODING_TYPE_SACD = 9,
75 AUDIO_CODING_TYPE_EAC3 = 10,
76 AUDIO_CODING_TYPE_DTS_HD = 11,
77 AUDIO_CODING_TYPE_MLP = 12,
78 AUDIO_CODING_TYPE_DST = 13,
79 AUDIO_CODING_TYPE_WMAPRO = 14,
80 AUDIO_CODING_TYPE_REF_CXT = 15,
81 /* also include valid xtypes below */
82 AUDIO_CODING_TYPE_HE_AAC = 15,
83 AUDIO_CODING_TYPE_HE_AAC2 = 16,
84 AUDIO_CODING_TYPE_MPEG_SURROUND = 17,
85 };
86
87 enum cea_audio_coding_xtypes {
88 AUDIO_CODING_XTYPE_HE_REF_CT = 0,
89 AUDIO_CODING_XTYPE_HE_AAC = 1,
90 AUDIO_CODING_XTYPE_HE_AAC2 = 2,
91 AUDIO_CODING_XTYPE_MPEG_SURROUND = 3,
92 AUDIO_CODING_XTYPE_FIRST_RESERVED = 4,
93 };
94
95 static char *cea_audio_coding_type_names[] = {
96 /* 0 */ "undefined",
97 /* 1 */ "LPCM",
98 /* 2 */ "AC-3",
99 /* 3 */ "MPEG1",
100 /* 4 */ "MP3",
101 /* 5 */ "MPEG2",
102 /* 6 */ "AAC-LC",
103 /* 7 */ "DTS",
104 /* 8 */ "ATRAC",
105 /* 9 */ "DSD (One Bit Audio)",
106 /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
107 /* 11 */ "DTS-HD",
108 /* 12 */ "MLP (Dolby TrueHD)",
109 /* 13 */ "DST",
110 /* 14 */ "WMAPro",
111 /* 15 */ "HE-AAC",
112 /* 16 */ "HE-AACv2",
113 /* 17 */ "MPEG Surround",
114 };
115
116 /*
117 * The following two lists are shared between
118 * - HDMI audio InfoFrame (source to sink)
119 * - CEA E-EDID Extension (sink to source)
120 */
121
122 /*
123 * SS1:SS0 index => sample size
124 */
125 static int cea_sample_sizes[4] = {
126 0, /* 0: Refer to Stream Header */
127 AC_SUPPCM_BITS_16, /* 1: 16 bits */
128 AC_SUPPCM_BITS_20, /* 2: 20 bits */
129 AC_SUPPCM_BITS_24, /* 3: 24 bits */
130 };
131
132 /*
133 * SF2:SF1:SF0 index => sampling frequency
134 */
135 static int cea_sampling_frequencies[8] = {
136 0, /* 0: Refer to Stream Header */
137 SNDRV_PCM_RATE_32000, /* 1: 32000Hz */
138 SNDRV_PCM_RATE_44100, /* 2: 44100Hz */
139 SNDRV_PCM_RATE_48000, /* 3: 48000Hz */
140 SNDRV_PCM_RATE_88200, /* 4: 88200Hz */
141 SNDRV_PCM_RATE_96000, /* 5: 96000Hz */
142 SNDRV_PCM_RATE_176400, /* 6: 176400Hz */
143 SNDRV_PCM_RATE_192000, /* 7: 192000Hz */
144 };
145
146 static unsigned char hdmi_get_eld_byte(struct hda_codec *codec, hda_nid_t nid,
147 int byte_index)
148 {
149 unsigned int val;
150
151 val = snd_hda_codec_read(codec, nid, 0,
152 AC_VERB_GET_HDMI_ELDD, byte_index);
153
154 #ifdef BE_PARANOID
155 printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
156 #endif
157
158 if ((val & AC_ELDD_ELD_VALID) == 0) {
159 snd_printd(KERN_INFO "HDMI: invalid ELD data byte %d\n",
160 byte_index);
161 val = 0;
162 }
163
164 return val & AC_ELDD_ELD_DATA;
165 }
166
167 #define GRAB_BITS(buf, byte, lowbit, bits) \
168 ({ \
169 BUILD_BUG_ON(lowbit > 7); \
170 BUILD_BUG_ON(bits > 8); \
171 BUILD_BUG_ON(bits <= 0); \
172 \
173 (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1); \
174 })
175
176 static void hdmi_update_short_audio_desc(struct cea_sad *a,
177 const unsigned char *buf)
178 {
179 int i;
180 int val;
181
182 val = GRAB_BITS(buf, 1, 0, 7);
183 a->rates = 0;
184 for (i = 0; i < 7; i++)
185 if (val & (1 << i))
186 a->rates |= cea_sampling_frequencies[i + 1];
187
188 a->channels = GRAB_BITS(buf, 0, 0, 3);
189 a->channels++;
190
191 a->format = GRAB_BITS(buf, 0, 3, 4);
192 switch (a->format) {
193 case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
194 snd_printd(KERN_INFO
195 "HDMI: audio coding type 0 not expected\n");
196 break;
197
198 case AUDIO_CODING_TYPE_LPCM:
199 val = GRAB_BITS(buf, 2, 0, 3);
200 a->sample_bits = 0;
201 for (i = 0; i < 3; i++)
202 if (val & (1 << i))
203 a->sample_bits |= cea_sample_sizes[i + 1];
204 break;
205
206 case AUDIO_CODING_TYPE_AC3:
207 case AUDIO_CODING_TYPE_MPEG1:
208 case AUDIO_CODING_TYPE_MP3:
209 case AUDIO_CODING_TYPE_MPEG2:
210 case AUDIO_CODING_TYPE_AACLC:
211 case AUDIO_CODING_TYPE_DTS:
212 case AUDIO_CODING_TYPE_ATRAC:
213 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
214 a->max_bitrate *= 8000;
215 break;
216
217 case AUDIO_CODING_TYPE_SACD:
218 break;
219
220 case AUDIO_CODING_TYPE_EAC3:
221 break;
222
223 case AUDIO_CODING_TYPE_DTS_HD:
224 break;
225
226 case AUDIO_CODING_TYPE_MLP:
227 break;
228
229 case AUDIO_CODING_TYPE_DST:
230 break;
231
232 case AUDIO_CODING_TYPE_WMAPRO:
233 a->profile = GRAB_BITS(buf, 2, 0, 3);
234 break;
235
236 case AUDIO_CODING_TYPE_REF_CXT:
237 a->format = GRAB_BITS(buf, 2, 3, 5);
238 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
239 a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
240 snd_printd(KERN_INFO
241 "HDMI: audio coding xtype %d not expected\n",
242 a->format);
243 a->format = 0;
244 } else
245 a->format += AUDIO_CODING_TYPE_HE_AAC -
246 AUDIO_CODING_XTYPE_HE_AAC;
247 break;
248 }
249 }
250
251 /*
252 * Be careful, ELD buf could be totally rubbish!
253 */
254 static int hdmi_update_eld(struct hdmi_eld *e,
255 const unsigned char *buf, int size)
256 {
257 int mnl;
258 int i;
259
260 e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
261 if (e->eld_ver != ELD_VER_CEA_861D &&
262 e->eld_ver != ELD_VER_PARTIAL) {
263 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
264 e->eld_ver);
265 goto out_fail;
266 }
267
268 e->eld_size = size;
269 e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
270 mnl = GRAB_BITS(buf, 4, 0, 5);
271 e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
272
273 e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
274 e->support_ai = GRAB_BITS(buf, 5, 1, 1);
275 e->conn_type = GRAB_BITS(buf, 5, 2, 2);
276 e->sad_count = GRAB_BITS(buf, 5, 4, 4);
277
278 e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
279 e->spk_alloc = GRAB_BITS(buf, 7, 0, 7);
280
281 e->port_id = get_unaligned_le64(buf + 8);
282
283 /* not specified, but the spec's tendency is little endian */
284 e->manufacture_id = get_unaligned_le16(buf + 16);
285 e->product_id = get_unaligned_le16(buf + 18);
286
287 if (mnl > ELD_MAX_MNL) {
288 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
289 goto out_fail;
290 } else if (ELD_FIXED_BYTES + mnl > size) {
291 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
292 goto out_fail;
293 } else
294 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl);
295
296 for (i = 0; i < e->sad_count; i++) {
297 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
298 snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
299 goto out_fail;
300 }
301 hdmi_update_short_audio_desc(e->sad + i,
302 buf + ELD_FIXED_BYTES + mnl + 3 * i);
303 }
304
305 return 0;
306
307 out_fail:
308 e->eld_ver = 0;
309 return -EINVAL;
310 }
311
312 static int hdmi_present_sense(struct hda_codec *codec, hda_nid_t nid)
313 {
314 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_PIN_SENSE, 0);
315 }
316
317 static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
318 {
319 int eldv;
320 int present;
321
322 present = hdmi_present_sense(codec, nid);
323 eldv = (present & AC_PINSENSE_ELDV);
324 present = (present & AC_PINSENSE_PRESENCE);
325
326 #ifdef CONFIG_SND_DEBUG_VERBOSE
327 printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
328 !!present, !!eldv);
329 #endif
330
331 return eldv && present;
332 }
333
334 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
335 {
336 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
337 AC_DIPSIZE_ELD_BUF);
338 }
339
340 int snd_hdmi_get_eld(struct hdmi_eld *eld,
341 struct hda_codec *codec, hda_nid_t nid)
342 {
343 int i;
344 int ret;
345 int size;
346 unsigned char *buf;
347
348 if (!hdmi_eld_valid(codec, nid))
349 return -ENOENT;
350
351 size = snd_hdmi_get_eld_size(codec, nid);
352 if (size == 0) {
353 /* wfg: workaround for ASUS P5E-VM HDMI board */
354 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
355 size = 128;
356 }
357 if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) {
358 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
359 return -ERANGE;
360 }
361
362 buf = kmalloc(size, GFP_KERNEL);
363 if (!buf)
364 return -ENOMEM;
365
366 for (i = 0; i < size; i++)
367 buf[i] = hdmi_get_eld_byte(codec, nid, i);
368
369 ret = hdmi_update_eld(eld, buf, size);
370
371 kfree(buf);
372 return ret;
373 }
374
375 static void hdmi_show_short_audio_desc(struct cea_sad *a)
376 {
377 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
378 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
379
380 if (!a->format)
381 return;
382
383 snd_print_pcm_rates(a->rates, buf, sizeof(buf));
384
385 if (a->format == AUDIO_CODING_TYPE_LPCM)
386 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2 - 8));
387 else if (a->max_bitrate)
388 snprintf(buf2, sizeof(buf2),
389 ", max bitrate = %d", a->max_bitrate);
390 else
391 buf2[0] = '\0';
392
393 printk(KERN_INFO "HDMI: supports coding type %s:"
394 " channels = %d, rates =%s%s\n",
395 cea_audio_coding_type_names[a->format],
396 a->channels,
397 buf,
398 buf2);
399 }
400
401 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
402 {
403 int i, j;
404
405 for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
406 if (spk_alloc & (1 << i))
407 j += snprintf(buf + j, buflen - j, " %s",
408 cea_speaker_allocation_names[i]);
409 }
410 buf[j] = '\0'; /* necessary when j == 0 */
411 }
412
413 void snd_hdmi_show_eld(struct hdmi_eld *e)
414 {
415 int i;
416
417 printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
418 e->monitor_name,
419 eld_connection_type_names[e->conn_type]);
420
421 if (e->spk_alloc) {
422 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
423 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
424 printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
425 }
426
427 for (i = 0; i < e->sad_count; i++)
428 hdmi_show_short_audio_desc(e->sad + i);
429 }
430
431 #ifdef CONFIG_PROC_FS
432
433 static void hdmi_print_sad_info(int i, struct cea_sad *a,
434 struct snd_info_buffer *buffer)
435 {
436 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
437
438 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
439 i, a->format, cea_audio_coding_type_names[a->format]);
440 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
441
442 snd_print_pcm_rates(a->rates, buf, sizeof(buf));
443 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
444
445 if (a->format == AUDIO_CODING_TYPE_LPCM) {
446 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
447 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
448 i, a->sample_bits, buf);
449 }
450
451 if (a->max_bitrate)
452 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
453 i, a->max_bitrate);
454
455 if (a->profile)
456 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
457 }
458
459 static void hdmi_print_eld_info(struct snd_info_entry *entry,
460 struct snd_info_buffer *buffer)
461 {
462 struct hdmi_eld *e = entry->private_data;
463 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
464 int i;
465 static char *eld_versoin_names[32] = {
466 "reserved",
467 "reserved",
468 "CEA-861D or below",
469 [3 ... 30] = "reserved",
470 [31] = "partial"
471 };
472 static char *cea_edid_version_names[8] = {
473 "no CEA EDID Timing Extension block present",
474 "CEA-861",
475 "CEA-861-A",
476 "CEA-861-B, C or D",
477 [4 ... 7] = "reserved"
478 };
479
480 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
481 snd_iprintf(buffer, "connection_type\t\t%s\n",
482 eld_connection_type_names[e->conn_type]);
483 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
484 eld_versoin_names[e->eld_ver]);
485 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
486 cea_edid_version_names[e->cea_edid_ver]);
487 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
488 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
489 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
490 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
491 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
492 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
493
494 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
495 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
496
497 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
498
499 for (i = 0; i < e->sad_count; i++)
500 hdmi_print_sad_info(i, e->sad + i, buffer);
501 }
502
503 static void hdmi_write_eld_info(struct snd_info_entry *entry,
504 struct snd_info_buffer *buffer)
505 {
506 struct hdmi_eld *e = entry->private_data;
507 char line[64];
508 char name[64];
509 char *sname;
510 long long val;
511 unsigned int n;
512
513 while (!snd_info_get_line(buffer, line, sizeof(line))) {
514 if (sscanf(line, "%s %llx", name, &val) != 2)
515 continue;
516 /*
517 * We don't allow modification to these fields:
518 * monitor_name manufacture_id product_id
519 * eld_version edid_version
520 */
521 if (!strcmp(name, "connection_type"))
522 e->conn_type = val;
523 else if (!strcmp(name, "port_id"))
524 e->port_id = val;
525 else if (!strcmp(name, "support_hdcp"))
526 e->support_hdcp = val;
527 else if (!strcmp(name, "support_ai"))
528 e->support_ai = val;
529 else if (!strcmp(name, "audio_sync_delay"))
530 e->aud_synch_delay = val;
531 else if (!strcmp(name, "speakers"))
532 e->spk_alloc = val;
533 else if (!strcmp(name, "sad_count"))
534 e->sad_count = val;
535 else if (!strncmp(name, "sad", 3)) {
536 sname = name + 4;
537 n = name[3] - '0';
538 if (name[4] >= '0' && name[4] <= '9') {
539 sname++;
540 n = 10 * n + name[4] - '0';
541 }
542 if (n >= ELD_MAX_SAD)
543 continue;
544 if (!strcmp(sname, "_coding_type"))
545 e->sad[n].format = val;
546 else if (!strcmp(sname, "_channels"))
547 e->sad[n].channels = val;
548 else if (!strcmp(sname, "_rates"))
549 e->sad[n].rates = val;
550 else if (!strcmp(sname, "_bits"))
551 e->sad[n].sample_bits = val;
552 else if (!strcmp(sname, "_max_bitrate"))
553 e->sad[n].max_bitrate = val;
554 else if (!strcmp(sname, "_profile"))
555 e->sad[n].profile = val;
556 if (n >= e->sad_count)
557 e->sad_count = n + 1;
558 }
559 }
560 }
561
562
563 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld)
564 {
565 char name[32];
566 struct snd_info_entry *entry;
567 int err;
568
569 snprintf(name, sizeof(name), "eld#%d", codec->addr);
570 err = snd_card_proc_new(codec->bus->card, name, &entry);
571 if (err < 0)
572 return err;
573
574 snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
575 entry->c.text.write = hdmi_write_eld_info;
576 entry->mode |= S_IWUSR;
577 eld->proc_entry = entry;
578
579 return 0;
580 }
581
582 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
583 {
584 if (!codec->bus->shutdown && eld->proc_entry) {
585 snd_device_free(codec->bus->card, eld->proc_entry);
586 eld->proc_entry = NULL;
587 }
588 }
589
590 #endif /* CONFIG_PROC_FS */
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