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TOMOYO Linux Cross Reference
Linux/sound/pci/hda/hda_eld.c

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.7 ] ~ [ linux-5.4.23 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.107 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.172 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.215 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.215 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 <linux/slab.h>
 26 #include <sound/core.h>
 27 #include <asm/unaligned.h>
 28 #include "hda_codec.h"
 29 #include "hda_local.h"
 30 
 31 enum eld_versions {
 32         ELD_VER_CEA_861D        = 2,
 33         ELD_VER_PARTIAL         = 31,
 34 };
 35 
 36 enum cea_edid_versions {
 37         CEA_EDID_VER_NONE       = 0,
 38         CEA_EDID_VER_CEA861     = 1,
 39         CEA_EDID_VER_CEA861A    = 2,
 40         CEA_EDID_VER_CEA861BCD  = 3,
 41         CEA_EDID_VER_RESERVED   = 4,
 42 };
 43 
 44 static char *cea_speaker_allocation_names[] = {
 45         /*  0 */ "FL/FR",
 46         /*  1 */ "LFE",
 47         /*  2 */ "FC",
 48         /*  3 */ "RL/RR",
 49         /*  4 */ "RC",
 50         /*  5 */ "FLC/FRC",
 51         /*  6 */ "RLC/RRC",
 52         /*  7 */ "FLW/FRW",
 53         /*  8 */ "FLH/FRH",
 54         /*  9 */ "TC",
 55         /* 10 */ "FCH",
 56 };
 57 
 58 static char *eld_connection_type_names[4] = {
 59         "HDMI",
 60         "DisplayPort",
 61         "2-reserved",
 62         "3-reserved"
 63 };
 64 
 65 enum cea_audio_coding_types {
 66         AUDIO_CODING_TYPE_REF_STREAM_HEADER     =  0,
 67         AUDIO_CODING_TYPE_LPCM                  =  1,
 68         AUDIO_CODING_TYPE_AC3                   =  2,
 69         AUDIO_CODING_TYPE_MPEG1                 =  3,
 70         AUDIO_CODING_TYPE_MP3                   =  4,
 71         AUDIO_CODING_TYPE_MPEG2                 =  5,
 72         AUDIO_CODING_TYPE_AACLC                 =  6,
 73         AUDIO_CODING_TYPE_DTS                   =  7,
 74         AUDIO_CODING_TYPE_ATRAC                 =  8,
 75         AUDIO_CODING_TYPE_SACD                  =  9,
 76         AUDIO_CODING_TYPE_EAC3                  = 10,
 77         AUDIO_CODING_TYPE_DTS_HD                = 11,
 78         AUDIO_CODING_TYPE_MLP                   = 12,
 79         AUDIO_CODING_TYPE_DST                   = 13,
 80         AUDIO_CODING_TYPE_WMAPRO                = 14,
 81         AUDIO_CODING_TYPE_REF_CXT               = 15,
 82         /* also include valid xtypes below */
 83         AUDIO_CODING_TYPE_HE_AAC                = 15,
 84         AUDIO_CODING_TYPE_HE_AAC2               = 16,
 85         AUDIO_CODING_TYPE_MPEG_SURROUND         = 17,
 86 };
 87 
 88 enum cea_audio_coding_xtypes {
 89         AUDIO_CODING_XTYPE_HE_REF_CT            = 0,
 90         AUDIO_CODING_XTYPE_HE_AAC               = 1,
 91         AUDIO_CODING_XTYPE_HE_AAC2              = 2,
 92         AUDIO_CODING_XTYPE_MPEG_SURROUND        = 3,
 93         AUDIO_CODING_XTYPE_FIRST_RESERVED       = 4,
 94 };
 95 
 96 static char *cea_audio_coding_type_names[] = {
 97         /*  0 */ "undefined",
 98         /*  1 */ "LPCM",
 99         /*  2 */ "AC-3",
100         /*  3 */ "MPEG1",
101         /*  4 */ "MP3",
102         /*  5 */ "MPEG2",
103         /*  6 */ "AAC-LC",
104         /*  7 */ "DTS",
105         /*  8 */ "ATRAC",
106         /*  9 */ "DSD (One Bit Audio)",
107         /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)",
108         /* 11 */ "DTS-HD",
109         /* 12 */ "MLP (Dolby TrueHD)",
110         /* 13 */ "DST",
111         /* 14 */ "WMAPro",
112         /* 15 */ "HE-AAC",
113         /* 16 */ "HE-AACv2",
114         /* 17 */ "MPEG Surround",
115 };
116 
117 /*
118  * The following two lists are shared between
119  *      - HDMI audio InfoFrame (source to sink)
120  *      - CEA E-EDID Extension (sink to source)
121  */
122 
123 /*
124  * SS1:SS0 index => sample size
125  */
126 static int cea_sample_sizes[4] = {
127         0,                      /* 0: Refer to Stream Header */
128         AC_SUPPCM_BITS_16,      /* 1: 16 bits */
129         AC_SUPPCM_BITS_20,      /* 2: 20 bits */
130         AC_SUPPCM_BITS_24,      /* 3: 24 bits */
131 };
132 
133 /*
134  * SF2:SF1:SF0 index => sampling frequency
135  */
136 static int cea_sampling_frequencies[8] = {
137         0,                      /* 0: Refer to Stream Header */
138         SNDRV_PCM_RATE_32000,   /* 1:  32000Hz */
139         SNDRV_PCM_RATE_44100,   /* 2:  44100Hz */
140         SNDRV_PCM_RATE_48000,   /* 3:  48000Hz */
141         SNDRV_PCM_RATE_88200,   /* 4:  88200Hz */
142         SNDRV_PCM_RATE_96000,   /* 5:  96000Hz */
143         SNDRV_PCM_RATE_176400,  /* 6: 176400Hz */
144         SNDRV_PCM_RATE_192000,  /* 7: 192000Hz */
145 };
146 
147 static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid,
148                                         int byte_index)
149 {
150         unsigned int val;
151 
152         val = snd_hda_codec_read(codec, nid, 0,
153                                         AC_VERB_GET_HDMI_ELDD, byte_index);
154 #ifdef BE_PARANOID
155         printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val);
156 #endif
157         return val;
158 }
159 
160 #define GRAB_BITS(buf, byte, lowbit, bits)              \
161 ({                                                      \
162         BUILD_BUG_ON(lowbit > 7);                       \
163         BUILD_BUG_ON(bits > 8);                         \
164         BUILD_BUG_ON(bits <= 0);                        \
165                                                         \
166         (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1);  \
167 })
168 
169 static void hdmi_update_short_audio_desc(struct cea_sad *a,
170                                          const unsigned char *buf)
171 {
172         int i;
173         int val;
174 
175         val = GRAB_BITS(buf, 1, 0, 7);
176         a->rates = 0;
177         for (i = 0; i < 7; i++)
178                 if (val & (1 << i))
179                         a->rates |= cea_sampling_frequencies[i + 1];
180 
181         a->channels = GRAB_BITS(buf, 0, 0, 3);
182         a->channels++;
183 
184         a->sample_bits = 0;
185         a->max_bitrate = 0;
186 
187         a->format = GRAB_BITS(buf, 0, 3, 4);
188         switch (a->format) {
189         case AUDIO_CODING_TYPE_REF_STREAM_HEADER:
190                 snd_printd(KERN_INFO
191                                 "HDMI: audio coding type 0 not expected\n");
192                 break;
193 
194         case AUDIO_CODING_TYPE_LPCM:
195                 val = GRAB_BITS(buf, 2, 0, 3);
196                 for (i = 0; i < 3; i++)
197                         if (val & (1 << i))
198                                 a->sample_bits |= cea_sample_sizes[i + 1];
199                 break;
200 
201         case AUDIO_CODING_TYPE_AC3:
202         case AUDIO_CODING_TYPE_MPEG1:
203         case AUDIO_CODING_TYPE_MP3:
204         case AUDIO_CODING_TYPE_MPEG2:
205         case AUDIO_CODING_TYPE_AACLC:
206         case AUDIO_CODING_TYPE_DTS:
207         case AUDIO_CODING_TYPE_ATRAC:
208                 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8);
209                 a->max_bitrate *= 8000;
210                 break;
211 
212         case AUDIO_CODING_TYPE_SACD:
213                 break;
214 
215         case AUDIO_CODING_TYPE_EAC3:
216                 break;
217 
218         case AUDIO_CODING_TYPE_DTS_HD:
219                 break;
220 
221         case AUDIO_CODING_TYPE_MLP:
222                 break;
223 
224         case AUDIO_CODING_TYPE_DST:
225                 break;
226 
227         case AUDIO_CODING_TYPE_WMAPRO:
228                 a->profile = GRAB_BITS(buf, 2, 0, 3);
229                 break;
230 
231         case AUDIO_CODING_TYPE_REF_CXT:
232                 a->format = GRAB_BITS(buf, 2, 3, 5);
233                 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT ||
234                     a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) {
235                         snd_printd(KERN_INFO
236                                 "HDMI: audio coding xtype %d not expected\n",
237                                 a->format);
238                         a->format = 0;
239                 } else
240                         a->format += AUDIO_CODING_TYPE_HE_AAC -
241                                      AUDIO_CODING_XTYPE_HE_AAC;
242                 break;
243         }
244 }
245 
246 /*
247  * Be careful, ELD buf could be totally rubbish!
248  */
249 int snd_hdmi_parse_eld(struct parsed_hdmi_eld *e,
250                           const unsigned char *buf, int size)
251 {
252         int mnl;
253         int i;
254 
255         e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
256         if (e->eld_ver != ELD_VER_CEA_861D &&
257             e->eld_ver != ELD_VER_PARTIAL) {
258                 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
259                                                                 e->eld_ver);
260                 goto out_fail;
261         }
262 
263         e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
264         mnl             = GRAB_BITS(buf, 4, 0, 5);
265         e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3);
266 
267         e->support_hdcp = GRAB_BITS(buf, 5, 0, 1);
268         e->support_ai   = GRAB_BITS(buf, 5, 1, 1);
269         e->conn_type    = GRAB_BITS(buf, 5, 2, 2);
270         e->sad_count    = GRAB_BITS(buf, 5, 4, 4);
271 
272         e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
273         e->spk_alloc    = GRAB_BITS(buf, 7, 0, 7);
274 
275         e->port_id        = get_unaligned_le64(buf + 8);
276 
277         /* not specified, but the spec's tendency is little endian */
278         e->manufacture_id = get_unaligned_le16(buf + 16);
279         e->product_id     = get_unaligned_le16(buf + 18);
280 
281         if (mnl > ELD_MAX_MNL) {
282                 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
283                 goto out_fail;
284         } else if (ELD_FIXED_BYTES + mnl > size) {
285                 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
286                 goto out_fail;
287         } else
288                 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);
289 
290         for (i = 0; i < e->sad_count; i++) {
291                 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
292                         snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
293                         goto out_fail;
294                 }
295                 hdmi_update_short_audio_desc(e->sad + i,
296                                         buf + ELD_FIXED_BYTES + mnl + 3 * i);
297         }
298 
299         /*
300          * HDMI sink's ELD info cannot always be retrieved for now, e.g.
301          * in console or for audio devices. Assume the highest speakers
302          * configuration, to _not_ prohibit multi-channel audio playback.
303          */
304         if (!e->spk_alloc)
305                 e->spk_alloc = 0xffff;
306 
307         return 0;
308 
309 out_fail:
310         return -EINVAL;
311 }
312 
313 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
314 {
315         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
316                                                  AC_DIPSIZE_ELD_BUF);
317 }
318 
319 int snd_hdmi_get_eld(struct hda_codec *codec, hda_nid_t nid,
320                      unsigned char *buf, int *eld_size)
321 {
322         int i;
323         int ret = 0;
324         int size;
325 
326         /*
327          * ELD size is initialized to zero in caller function. If no errors and
328          * ELD is valid, actual eld_size is assigned.
329          */
330 
331         size = snd_hdmi_get_eld_size(codec, nid);
332         if (size == 0) {
333                 /* wfg: workaround for ASUS P5E-VM HDMI board */
334                 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n");
335                 size = 128;
336         }
337         if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
338                 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size);
339                 return -ERANGE;
340         }
341 
342         /* set ELD buffer */
343         for (i = 0; i < size; i++) {
344                 unsigned int val = hdmi_get_eld_data(codec, nid, i);
345                 /*
346                  * Graphics driver might be writing to ELD buffer right now.
347                  * Just abort. The caller will repoll after a while.
348                  */
349                 if (!(val & AC_ELDD_ELD_VALID)) {
350                         snd_printd(KERN_INFO
351                                   "HDMI: invalid ELD data byte %d\n", i);
352                         ret = -EINVAL;
353                         goto error;
354                 }
355                 val &= AC_ELDD_ELD_DATA;
356                 /*
357                  * The first byte cannot be zero. This can happen on some DVI
358                  * connections. Some Intel chips may also need some 250ms delay
359                  * to return non-zero ELD data, even when the graphics driver
360                  * correctly writes ELD content before setting ELD_valid bit.
361                  */
362                 if (!val && !i) {
363                         snd_printdd(KERN_INFO "HDMI: 0 ELD data\n");
364                         ret = -EINVAL;
365                         goto error;
366                 }
367                 buf[i] = val;
368         }
369 
370         *eld_size = size;
371 error:
372         return ret;
373 }
374 
375 /**
376  * SNDRV_PCM_RATE_* and AC_PAR_PCM values don't match, print correct rates with
377  * hdmi-specific routine.
378  */
379 static void hdmi_print_pcm_rates(int pcm, char *buf, int buflen)
380 {
381         static unsigned int alsa_rates[] = {
382                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
383                 88200, 96000, 176400, 192000, 384000
384         };
385         int i, j;
386 
387         for (i = 0, j = 0; i < ARRAY_SIZE(alsa_rates); i++)
388                 if (pcm & (1 << i))
389                         j += snprintf(buf + j, buflen - j,  " %d",
390                                 alsa_rates[i]);
391 
392         buf[j] = '\0'; /* necessary when j == 0 */
393 }
394 
395 #define SND_PRINT_RATES_ADVISED_BUFSIZE 80
396 
397 static void hdmi_show_short_audio_desc(struct cea_sad *a)
398 {
399         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
400         char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits =";
401 
402         if (!a->format)
403                 return;
404 
405         hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
406 
407         if (a->format == AUDIO_CODING_TYPE_LPCM)
408                 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
409         else if (a->max_bitrate)
410                 snprintf(buf2, sizeof(buf2),
411                                 ", max bitrate = %d", a->max_bitrate);
412         else
413                 buf2[0] = '\0';
414 
415         _snd_printd(SND_PR_VERBOSE, "HDMI: supports coding type %s:"
416                         " channels = %d, rates =%s%s\n",
417                         cea_audio_coding_type_names[a->format],
418                         a->channels,
419                         buf,
420                         buf2);
421 }
422 
423 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
424 {
425         int i, j;
426 
427         for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
428                 if (spk_alloc & (1 << i))
429                         j += snprintf(buf + j, buflen - j,  " %s",
430                                         cea_speaker_allocation_names[i]);
431         }
432         buf[j] = '\0';  /* necessary when j == 0 */
433 }
434 
435 void snd_hdmi_show_eld(struct parsed_hdmi_eld *e)
436 {
437         int i;
438 
439         _snd_printd(SND_PR_VERBOSE, "HDMI: detected monitor %s at connection type %s\n",
440                         e->monitor_name,
441                         eld_connection_type_names[e->conn_type]);
442 
443         if (e->spk_alloc) {
444                 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
445                 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
446                 _snd_printd(SND_PR_VERBOSE, "HDMI: available speakers:%s\n", buf);
447         }
448 
449         for (i = 0; i < e->sad_count; i++)
450                 hdmi_show_short_audio_desc(e->sad + i);
451 }
452 
453 #ifdef CONFIG_PROC_FS
454 
455 static void hdmi_print_sad_info(int i, struct cea_sad *a,
456                                 struct snd_info_buffer *buffer)
457 {
458         char buf[SND_PRINT_RATES_ADVISED_BUFSIZE];
459 
460         snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n",
461                         i, a->format, cea_audio_coding_type_names[a->format]);
462         snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels);
463 
464         hdmi_print_pcm_rates(a->rates, buf, sizeof(buf));
465         snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf);
466 
467         if (a->format == AUDIO_CODING_TYPE_LPCM) {
468                 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf));
469                 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n",
470                                                         i, a->sample_bits, buf);
471         }
472 
473         if (a->max_bitrate)
474                 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n",
475                                                         i, a->max_bitrate);
476 
477         if (a->profile)
478                 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile);
479 }
480 
481 static void hdmi_print_eld_info(struct snd_info_entry *entry,
482                                 struct snd_info_buffer *buffer)
483 {
484         struct hdmi_eld *eld = entry->private_data;
485         struct parsed_hdmi_eld *e = &eld->info;
486         char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
487         int i;
488         static char *eld_version_names[32] = {
489                 "reserved",
490                 "reserved",
491                 "CEA-861D or below",
492                 [3 ... 30] = "reserved",
493                 [31] = "partial"
494         };
495         static char *cea_edid_version_names[8] = {
496                 "no CEA EDID Timing Extension block present",
497                 "CEA-861",
498                 "CEA-861-A",
499                 "CEA-861-B, C or D",
500                 [4 ... 7] = "reserved"
501         };
502 
503         mutex_lock(&eld->lock);
504         snd_iprintf(buffer, "monitor_present\t\t%d\n", eld->monitor_present);
505         snd_iprintf(buffer, "eld_valid\t\t%d\n", eld->eld_valid);
506         if (!eld->eld_valid) {
507                 mutex_unlock(&eld->lock);
508                 return;
509         }
510         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
511         snd_iprintf(buffer, "connection_type\t\t%s\n",
512                                 eld_connection_type_names[e->conn_type]);
513         snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver,
514                                         eld_version_names[e->eld_ver]);
515         snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver,
516                                 cea_edid_version_names[e->cea_edid_ver]);
517         snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id);
518         snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id);
519         snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id);
520         snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp);
521         snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai);
522         snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay);
523 
524         snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
525         snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf);
526 
527         snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count);
528 
529         for (i = 0; i < e->sad_count; i++)
530                 hdmi_print_sad_info(i, e->sad + i, buffer);
531         mutex_unlock(&eld->lock);
532 }
533 
534 static void hdmi_write_eld_info(struct snd_info_entry *entry,
535                                 struct snd_info_buffer *buffer)
536 {
537         struct hdmi_eld *eld = entry->private_data;
538         struct parsed_hdmi_eld *e = &eld->info;
539         char line[64];
540         char name[64];
541         char *sname;
542         long long val;
543         unsigned int n;
544 
545         mutex_lock(&eld->lock);
546         while (!snd_info_get_line(buffer, line, sizeof(line))) {
547                 if (sscanf(line, "%s %llx", name, &val) != 2)
548                         continue;
549                 /*
550                  * We don't allow modification to these fields:
551                  *      monitor_name manufacture_id product_id
552                  *      eld_version edid_version
553                  */
554                 if (!strcmp(name, "monitor_present"))
555                         eld->monitor_present = val;
556                 else if (!strcmp(name, "eld_valid"))
557                         eld->eld_valid = val;
558                 else if (!strcmp(name, "connection_type"))
559                         e->conn_type = val;
560                 else if (!strcmp(name, "port_id"))
561                         e->port_id = val;
562                 else if (!strcmp(name, "support_hdcp"))
563                         e->support_hdcp = val;
564                 else if (!strcmp(name, "support_ai"))
565                         e->support_ai = val;
566                 else if (!strcmp(name, "audio_sync_delay"))
567                         e->aud_synch_delay = val;
568                 else if (!strcmp(name, "speakers"))
569                         e->spk_alloc = val;
570                 else if (!strcmp(name, "sad_count"))
571                         e->sad_count = val;
572                 else if (!strncmp(name, "sad", 3)) {
573                         sname = name + 4;
574                         n = name[3] - '';
575                         if (name[4] >= '' && name[4] <= '9') {
576                                 sname++;
577                                 n = 10 * n + name[4] - '';
578                         }
579                         if (n >= ELD_MAX_SAD)
580                                 continue;
581                         if (!strcmp(sname, "_coding_type"))
582                                 e->sad[n].format = val;
583                         else if (!strcmp(sname, "_channels"))
584                                 e->sad[n].channels = val;
585                         else if (!strcmp(sname, "_rates"))
586                                 e->sad[n].rates = val;
587                         else if (!strcmp(sname, "_bits"))
588                                 e->sad[n].sample_bits = val;
589                         else if (!strcmp(sname, "_max_bitrate"))
590                                 e->sad[n].max_bitrate = val;
591                         else if (!strcmp(sname, "_profile"))
592                                 e->sad[n].profile = val;
593                         if (n >= e->sad_count)
594                                 e->sad_count = n + 1;
595                 }
596         }
597         mutex_unlock(&eld->lock);
598 }
599 
600 
601 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld,
602                          int index)
603 {
604         char name[32];
605         struct snd_info_entry *entry;
606         int err;
607 
608         snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index);
609         err = snd_card_proc_new(codec->bus->card, name, &entry);
610         if (err < 0)
611                 return err;
612 
613         snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
614         entry->c.text.write = hdmi_write_eld_info;
615         entry->mode |= S_IWUSR;
616         eld->proc_entry = entry;
617 
618         return 0;
619 }
620 
621 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
622 {
623         if (!codec->bus->shutdown && eld->proc_entry) {
624                 snd_device_free(codec->bus->card, eld->proc_entry);
625                 eld->proc_entry = NULL;
626         }
627 }
628 
629 #endif /* CONFIG_PROC_FS */
630 
631 /* update PCM info based on ELD */
632 void snd_hdmi_eld_update_pcm_info(struct parsed_hdmi_eld *e,
633                               struct hda_pcm_stream *hinfo)
634 {
635         u32 rates;
636         u64 formats;
637         unsigned int maxbps;
638         unsigned int channels_max;
639         int i;
640 
641         /* assume basic audio support (the basic audio flag is not in ELD;
642          * however, all audio capable sinks are required to support basic
643          * audio) */
644         rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
645                 SNDRV_PCM_RATE_48000;
646         formats = SNDRV_PCM_FMTBIT_S16_LE;
647         maxbps = 16;
648         channels_max = 2;
649         for (i = 0; i < e->sad_count; i++) {
650                 struct cea_sad *a = &e->sad[i];
651                 rates |= a->rates;
652                 if (a->channels > channels_max)
653                         channels_max = a->channels;
654                 if (a->format == AUDIO_CODING_TYPE_LPCM) {
655                         if (a->sample_bits & AC_SUPPCM_BITS_20) {
656                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
657                                 if (maxbps < 20)
658                                         maxbps = 20;
659                         }
660                         if (a->sample_bits & AC_SUPPCM_BITS_24) {
661                                 formats |= SNDRV_PCM_FMTBIT_S32_LE;
662                                 if (maxbps < 24)
663                                         maxbps = 24;
664                         }
665                 }
666         }
667 
668         /* restrict the parameters by the values the codec provides */
669         hinfo->rates &= rates;
670         hinfo->formats &= formats;
671         hinfo->maxbps = min(hinfo->maxbps, maxbps);
672         hinfo->channels_max = min(hinfo->channels_max, channels_max);
673 }
674 

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