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TOMOYO Linux Cross Reference
Linux/sound/pci/ac97/ac97_pcm.c

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  1 /*
  2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  3  *  Universal interface for Audio Codec '97
  4  *
  5  *  For more details look to AC '97 component specification revision 2.2
  6  *  by Intel Corporation (http://developer.intel.com) and to datasheets
  7  *  for specific codecs.
  8  *
  9  *
 10  *   This program is free software; you can redistribute it and/or modify
 11  *   it under the terms of the GNU General Public License as published by
 12  *   the Free Software Foundation; either version 2 of the License, or
 13  *   (at your option) any later version.
 14  *
 15  *   This program is distributed in the hope that it will be useful,
 16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  *   GNU General Public License for more details.
 19  *
 20  *   You should have received a copy of the GNU General Public License
 21  *   along with this program; if not, write to the Free Software
 22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 23  *
 24  */
 25 
 26 #include <linux/delay.h>
 27 #include <linux/init.h>
 28 #include <linux/slab.h>
 29 #include <linux/mutex.h>
 30 #include <linux/export.h>
 31 
 32 #include <sound/core.h>
 33 #include <sound/pcm.h>
 34 #include <sound/control.h>
 35 #include <sound/ac97_codec.h>
 36 #include <sound/asoundef.h>
 37 #include "ac97_id.h"
 38 #include "ac97_local.h"
 39 
 40 /*
 41  *  PCM support
 42  */
 43 
 44 static unsigned char rate_reg_tables[2][4][9] = {
 45 {
 46   /* standard rates */
 47   {
 48         /* 3&4 front, 7&8 rear, 6&9 center/lfe */
 49         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
 50         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
 51         0xff,                           /* slot 5 */
 52         AC97_PCM_LFE_DAC_RATE,          /* slot 6 */
 53         AC97_PCM_SURR_DAC_RATE,         /* slot 7 */
 54         AC97_PCM_SURR_DAC_RATE,         /* slot 8 */
 55         AC97_PCM_LFE_DAC_RATE,          /* slot 9 */
 56         0xff,                           /* slot 10 */
 57         0xff,                           /* slot 11 */
 58   },
 59   {
 60         /* 7&8 front, 6&9 rear, 10&11 center/lfe */
 61         0xff,                           /* slot 3 */
 62         0xff,                           /* slot 4 */
 63         0xff,                           /* slot 5 */
 64         AC97_PCM_SURR_DAC_RATE,         /* slot 6 */
 65         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
 66         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
 67         AC97_PCM_SURR_DAC_RATE,         /* slot 9 */
 68         AC97_PCM_LFE_DAC_RATE,          /* slot 10 */
 69         AC97_PCM_LFE_DAC_RATE,          /* slot 11 */
 70   },
 71   {
 72         /* 6&9 front, 10&11 rear, 3&4 center/lfe */
 73         AC97_PCM_LFE_DAC_RATE,          /* slot 3 */
 74         AC97_PCM_LFE_DAC_RATE,          /* slot 4 */
 75         0xff,                           /* slot 5 */
 76         AC97_PCM_FRONT_DAC_RATE,        /* slot 6 */
 77         0xff,                           /* slot 7 */
 78         0xff,                           /* slot 8 */
 79         AC97_PCM_FRONT_DAC_RATE,        /* slot 9 */
 80         AC97_PCM_SURR_DAC_RATE,         /* slot 10 */
 81         AC97_PCM_SURR_DAC_RATE,         /* slot 11 */
 82   },
 83   {
 84         /* 10&11 front, 3&4 rear, 7&8 center/lfe */
 85         AC97_PCM_SURR_DAC_RATE,         /* slot 3 */
 86         AC97_PCM_SURR_DAC_RATE,         /* slot 4 */
 87         0xff,                           /* slot 5 */
 88         0xff,                           /* slot 6 */
 89         AC97_PCM_LFE_DAC_RATE,          /* slot 7 */
 90         AC97_PCM_LFE_DAC_RATE,          /* slot 8 */
 91         0xff,                           /* slot 9 */
 92         AC97_PCM_FRONT_DAC_RATE,        /* slot 10 */
 93         AC97_PCM_FRONT_DAC_RATE,        /* slot 11 */
 94   },
 95 },
 96 {
 97   /* double rates */
 98   {
 99         /* 3&4 front, 7&8 front (t+1) */
100         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
101         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
102         0xff,                           /* slot 5 */
103         0xff,                           /* slot 6 */
104         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
105         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
106         0xff,                           /* slot 9 */
107         0xff,                           /* slot 10 */
108         0xff,                           /* slot 11 */
109   },
110   {
111         /* not specified in the specification */
112         0xff,                           /* slot 3 */
113         0xff,                           /* slot 4 */
114         0xff,                           /* slot 5 */
115         0xff,                           /* slot 6 */
116         0xff,                           /* slot 7 */
117         0xff,                           /* slot 8 */
118         0xff,                           /* slot 9 */
119         0xff,                           /* slot 10 */
120         0xff,                           /* slot 11 */
121   },
122   {
123         0xff,                           /* slot 3 */
124         0xff,                           /* slot 4 */
125         0xff,                           /* slot 5 */
126         0xff,                           /* slot 6 */
127         0xff,                           /* slot 7 */
128         0xff,                           /* slot 8 */
129         0xff,                           /* slot 9 */
130         0xff,                           /* slot 10 */
131         0xff,                           /* slot 11 */
132   },
133   {
134         0xff,                           /* slot 3 */
135         0xff,                           /* slot 4 */
136         0xff,                           /* slot 5 */
137         0xff,                           /* slot 6 */
138         0xff,                           /* slot 7 */
139         0xff,                           /* slot 8 */
140         0xff,                           /* slot 9 */
141         0xff,                           /* slot 10 */
142         0xff,                           /* slot 11 */
143   }
144 }};
145 
146 /* FIXME: more various mappings for ADC? */
147 static unsigned char rate_cregs[9] = {
148         AC97_PCM_LR_ADC_RATE,   /* 3 */
149         AC97_PCM_LR_ADC_RATE,   /* 4 */
150         0xff,                   /* 5 */
151         AC97_PCM_MIC_ADC_RATE,  /* 6 */
152         0xff,                   /* 7 */
153         0xff,                   /* 8 */
154         0xff,                   /* 9 */
155         0xff,                   /* 10 */
156         0xff,                   /* 11 */
157 };
158 
159 static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx,
160                                   unsigned short slot, int dbl)
161 {
162         if (slot < 3)
163                 return 0xff;
164         if (slot > 11)
165                 return 0xff;
166         if (pcm->spdif)
167                 return AC97_SPDIF; /* pseudo register */
168         if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK)
169                 return rate_reg_tables[dbl][pcm->r[dbl].rate_table[cidx]][slot - 3];
170         else
171                 return rate_cregs[slot - 3];
172 }
173 
174 static int set_spdif_rate(struct snd_ac97 *ac97, unsigned short rate)
175 {
176         unsigned short old, bits, reg, mask;
177         unsigned int sbits;
178 
179         if (! (ac97->ext_id & AC97_EI_SPDIF))
180                 return -ENODEV;
181 
182         /* TODO: double rate support */
183         if (ac97->flags & AC97_CS_SPDIF) {
184                 switch (rate) {
185                 case 48000: bits = 0; break;
186                 case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
187                 default: /* invalid - disable output */
188                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
189                         return -EINVAL;
190                 }
191                 reg = AC97_CSR_SPDIF;
192                 mask = 1 << AC97_SC_SPSR_SHIFT;
193         } else {
194                 if (ac97->id == AC97_ID_CM9739 && rate != 48000) {
195                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
196                         return -EINVAL;
197                 }
198                 switch (rate) {
199                 case 44100: bits = AC97_SC_SPSR_44K; break;
200                 case 48000: bits = AC97_SC_SPSR_48K; break;
201                 case 32000: bits = AC97_SC_SPSR_32K; break;
202                 default: /* invalid - disable output */
203                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
204                         return -EINVAL;
205                 }
206                 reg = AC97_SPDIF;
207                 mask = AC97_SC_SPSR_MASK;
208         }
209 
210         mutex_lock(&ac97->reg_mutex);
211         old = snd_ac97_read(ac97, reg) & mask;
212         if (old != bits) {
213                 snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
214                 snd_ac97_update_bits_nolock(ac97, reg, mask, bits);
215                 /* update the internal spdif bits */
216                 sbits = ac97->spdif_status;
217                 if (sbits & IEC958_AES0_PROFESSIONAL) {
218                         sbits &= ~IEC958_AES0_PRO_FS;
219                         switch (rate) {
220                         case 44100: sbits |= IEC958_AES0_PRO_FS_44100; break;
221                         case 48000: sbits |= IEC958_AES0_PRO_FS_48000; break;
222                         case 32000: sbits |= IEC958_AES0_PRO_FS_32000; break;
223                         }
224                 } else {
225                         sbits &= ~(IEC958_AES3_CON_FS << 24);
226                         switch (rate) {
227                         case 44100: sbits |= IEC958_AES3_CON_FS_44100<<24; break;
228                         case 48000: sbits |= IEC958_AES3_CON_FS_48000<<24; break;
229                         case 32000: sbits |= IEC958_AES3_CON_FS_32000<<24; break;
230                         }
231                 }
232                 ac97->spdif_status = sbits;
233         }
234         snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, AC97_EA_SPDIF);
235         mutex_unlock(&ac97->reg_mutex);
236         return 0;
237 }
238 
239 /**
240  * snd_ac97_set_rate - change the rate of the given input/output.
241  * @ac97: the ac97 instance
242  * @reg: the register to change
243  * @rate: the sample rate to set
244  *
245  * Changes the rate of the given input/output on the codec.
246  * If the codec doesn't support VAR, the rate must be 48000 (except
247  * for SPDIF).
248  *
249  * The valid registers are AC97_PMC_MIC_ADC_RATE,
250  * AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
251  * AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
252  * if the codec supports them.
253  * AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
254  * status bits.
255  *
256  * Return: Zero if successful, or a negative error code on failure.
257  */
258 int snd_ac97_set_rate(struct snd_ac97 *ac97, int reg, unsigned int rate)
259 {
260         int dbl;
261         unsigned int tmp;
262         
263         dbl = rate > 48000;
264         if (dbl) {
265                 if (!(ac97->flags & AC97_DOUBLE_RATE))
266                         return -EINVAL;
267                 if (reg != AC97_PCM_FRONT_DAC_RATE)
268                         return -EINVAL;
269         }
270 
271         snd_ac97_update_power(ac97, reg, 1);
272         switch (reg) {
273         case AC97_PCM_MIC_ADC_RATE:
274                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)      /* MIC VRA */
275                         if (rate != 48000)
276                                 return -EINVAL;
277                 break;
278         case AC97_PCM_FRONT_DAC_RATE:
279         case AC97_PCM_LR_ADC_RATE:
280                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)      /* VRA */
281                         if (rate != 48000 && rate != 96000)
282                                 return -EINVAL;
283                 break;
284         case AC97_PCM_SURR_DAC_RATE:
285                 if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
286                         return -EINVAL;
287                 break;
288         case AC97_PCM_LFE_DAC_RATE:
289                 if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
290                         return -EINVAL;
291                 break;
292         case AC97_SPDIF:
293                 /* special case */
294                 return set_spdif_rate(ac97, rate);
295         default:
296                 return -EINVAL;
297         }
298         if (dbl)
299                 rate /= 2;
300         tmp = (rate * ac97->bus->clock) / 48000;
301         if (tmp > 65535)
302                 return -EINVAL;
303         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
304                 snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
305                                      AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
306         snd_ac97_update(ac97, reg, tmp & 0xffff);
307         snd_ac97_read(ac97, reg);
308         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
309                 /* Intel controllers require double rate data to be put in
310                  * slots 7+8
311                  */
312                 snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
313                                      AC97_GP_DRSS_MASK,
314                                      dbl ? AC97_GP_DRSS_78 : 0);
315                 snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
316         }
317         return 0;
318 }
319 
320 EXPORT_SYMBOL(snd_ac97_set_rate);
321 
322 static unsigned short get_pslots(struct snd_ac97 *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
323 {
324         if (!ac97_is_audio(ac97))
325                 return 0;
326         if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
327                 unsigned short slots = 0;
328                 if (ac97_is_rev22(ac97)) {
329                         /* Note: it's simply emulation of AMAP behaviour */
330                         u16 es;
331                         es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
332                         switch (ac97->addr) {
333                         case 1:
334                         case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
335                         case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
336                         }
337                         snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
338                 }
339                 switch (ac97->addr) {
340                 case 0:
341                         slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
342                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
343                                 slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
344                         if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
345                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
346                         if (ac97->ext_id & AC97_EI_SPDIF) {
347                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
348                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
349                                 else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
350                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
351                                 else
352                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
353                         }
354                         *rate_table = 0;
355                         break;
356                 case 1:
357                 case 2:
358                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
359                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
360                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
361                         if (ac97->ext_id & AC97_EI_SPDIF) {
362                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
363                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
364                                 else
365                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
366                         }
367                         *rate_table = 1;
368                         break;
369                 case 3:
370                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
371                         if (ac97->ext_id & AC97_EI_SPDIF)
372                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
373                         *rate_table = 2;
374                         break;
375                 }
376                 return slots;
377         } else {
378                 unsigned short slots;
379                 slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
380                 if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
381                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
382                 if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
383                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
384                 if (ac97->ext_id & AC97_EI_SPDIF) {
385                         if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
386                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
387                         else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
388                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
389                         else
390                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
391                 }
392                 *rate_table = 0;
393                 return slots;
394         }
395 }
396 
397 static unsigned short get_cslots(struct snd_ac97 *ac97)
398 {
399         unsigned short slots;
400 
401         if (!ac97_is_audio(ac97))
402                 return 0;
403         slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
404         slots |= (1<<AC97_SLOT_MIC);
405         return slots;
406 }
407 
408 static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
409 {
410         int i, idx;
411         unsigned int rates = ~0;
412         unsigned char reg;
413 
414         for (i = 3; i < 12; i++) {
415                 if (!(slots & (1 << i)))
416                         continue;
417                 reg = get_slot_reg(pcm, cidx, i, dbl);
418                 switch (reg) {
419                 case AC97_PCM_FRONT_DAC_RATE:   idx = AC97_RATES_FRONT_DAC; break;
420                 case AC97_PCM_SURR_DAC_RATE:    idx = AC97_RATES_SURR_DAC; break;
421                 case AC97_PCM_LFE_DAC_RATE:     idx = AC97_RATES_LFE_DAC; break;
422                 case AC97_PCM_LR_ADC_RATE:      idx = AC97_RATES_ADC; break;
423                 case AC97_PCM_MIC_ADC_RATE:     idx = AC97_RATES_MIC_ADC; break;
424                 default:                        idx = AC97_RATES_SPDIF; break;
425                 }
426                 rates &= pcm->r[dbl].codec[cidx]->rates[idx];
427         }
428         if (!dbl)
429                 rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
430                            SNDRV_PCM_RATE_96000);
431         return rates;
432 }
433 
434 /**
435  * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
436  * @bus: the ac97 bus instance
437  * @pcms_count: count of PCMs to be assigned
438  * @pcms: PCMs to be assigned
439  *
440  * It assigns available AC97 slots for given PCMs. If none or only
441  * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
442  * are reduced and might be zero.
443  *
444  * Return: Zero if successful, or a negative error code on failure.
445  */
446 int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
447                         unsigned short pcms_count,
448                         const struct ac97_pcm *pcms)
449 {
450         int i, j, k;
451         const struct ac97_pcm *pcm;
452         struct ac97_pcm *rpcms, *rpcm;
453         unsigned short avail_slots[2][4];
454         unsigned char rate_table[2][4];
455         unsigned short tmp, slots;
456         unsigned short spdif_slots[4];
457         unsigned int rates;
458         struct snd_ac97 *codec;
459 
460         rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
461         if (rpcms == NULL)
462                 return -ENOMEM;
463         memset(avail_slots, 0, sizeof(avail_slots));
464         memset(rate_table, 0, sizeof(rate_table));
465         memset(spdif_slots, 0, sizeof(spdif_slots));
466         for (i = 0; i < 4; i++) {
467                 codec = bus->codec[i];
468                 if (!codec)
469                         continue;
470                 avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
471                 avail_slots[1][i] = get_cslots(codec);
472                 if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
473                         for (j = 0; j < i; j++) {
474                                 if (bus->codec[j])
475                                         avail_slots[1][i] &= ~avail_slots[1][j];
476                         }
477                 }
478         }
479         /* first step - exclusive devices */
480         for (i = 0; i < pcms_count; i++) {
481                 pcm = &pcms[i];
482                 rpcm = &rpcms[i];
483                 /* low-level driver thinks that it's more clever */
484                 if (pcm->copy_flag) {
485                         *rpcm = *pcm;
486                         continue;
487                 }
488                 rpcm->stream = pcm->stream;
489                 rpcm->exclusive = pcm->exclusive;
490                 rpcm->spdif = pcm->spdif;
491                 rpcm->private_value = pcm->private_value;
492                 rpcm->bus = bus;
493                 rpcm->rates = ~0;
494                 slots = pcm->r[0].slots;
495                 for (j = 0; j < 4 && slots; j++) {
496                         if (!bus->codec[j])
497                                 continue;
498                         rates = ~0;
499                         if (pcm->spdif && pcm->stream == 0)
500                                 tmp = spdif_slots[j];
501                         else
502                                 tmp = avail_slots[pcm->stream][j];
503                         if (pcm->exclusive) {
504                                 /* exclusive access */
505                                 tmp &= slots;
506                                 for (k = 0; k < i; k++) {
507                                         if (rpcm->stream == rpcms[k].stream)
508                                                 tmp &= ~rpcms[k].r[0].rslots[j];
509                                 }
510                         } else {
511                                 /* non-exclusive access */
512                                 tmp &= pcm->r[0].slots;
513                         }
514                         if (tmp) {
515                                 rpcm->r[0].rslots[j] = tmp;
516                                 rpcm->r[0].codec[j] = bus->codec[j];
517                                 rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
518                                 if (bus->no_vra)
519                                         rates = SNDRV_PCM_RATE_48000;
520                                 else
521                                         rates = get_rates(rpcm, j, tmp, 0);
522                                 if (pcm->exclusive)
523                                         avail_slots[pcm->stream][j] &= ~tmp;
524                         }
525                         slots &= ~tmp;
526                         rpcm->r[0].slots |= tmp;
527                         rpcm->rates &= rates;
528                 }
529                 /* for double rate, we check the first codec only */
530                 if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
531                     bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
532                     rate_table[pcm->stream][0] == 0) {
533                         tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
534                               (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
535                         if ((tmp & pcm->r[1].slots) == tmp) {
536                                 rpcm->r[1].slots = tmp;
537                                 rpcm->r[1].rslots[0] = tmp;
538                                 rpcm->r[1].rate_table[0] = 0;
539                                 rpcm->r[1].codec[0] = bus->codec[0];
540                                 if (pcm->exclusive)
541                                         avail_slots[pcm->stream][0] &= ~tmp;
542                                 if (bus->no_vra)
543                                         rates = SNDRV_PCM_RATE_96000;
544                                 else
545                                         rates = get_rates(rpcm, 0, tmp, 1);
546                                 rpcm->rates |= rates;
547                         }
548                 }
549                 if (rpcm->rates == ~0)
550                         rpcm->rates = 0; /* not used */
551         }
552         bus->pcms_count = pcms_count;
553         bus->pcms = rpcms;
554         return 0;
555 }
556 
557 EXPORT_SYMBOL(snd_ac97_pcm_assign);
558 
559 /**
560  * snd_ac97_pcm_open - opens the given AC97 pcm
561  * @pcm: the ac97 pcm instance
562  * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
563  * @cfg: output stream characteristics
564  * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
565  *
566  * It locks the specified slots and sets the given rate to AC97 registers.
567  *
568  * Return: Zero if successful, or a negative error code on failure.
569  */
570 int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
571                       enum ac97_pcm_cfg cfg, unsigned short slots)
572 {
573         struct snd_ac97_bus *bus;
574         int i, cidx, r, ok_flag;
575         unsigned int reg_ok[4] = {0,0,0,0};
576         unsigned char reg;
577         int err = 0;
578 
579         r = rate > 48000;
580         bus = pcm->bus;
581         if (cfg == AC97_PCM_CFG_SPDIF) {
582                 for (cidx = 0; cidx < 4; cidx++)
583                         if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
584                                 err = set_spdif_rate(bus->codec[cidx], rate);
585                                 if (err < 0)
586                                         return err;
587                         }
588         }
589         spin_lock_irq(&pcm->bus->bus_lock);
590         for (i = 3; i < 12; i++) {
591                 if (!(slots & (1 << i)))
592                         continue;
593                 ok_flag = 0;
594                 for (cidx = 0; cidx < 4; cidx++) {
595                         if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
596                                 spin_unlock_irq(&pcm->bus->bus_lock);
597                                 err = -EBUSY;
598                                 goto error;
599                         }
600                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
601                                 bus->used_slots[pcm->stream][cidx] |= (1 << i);
602                                 ok_flag++;
603                         }
604                 }
605                 if (!ok_flag) {
606                         spin_unlock_irq(&pcm->bus->bus_lock);
607                         snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
608                         err = -EAGAIN;
609                         goto error;
610                 }
611         }
612         pcm->cur_dbl = r;
613         spin_unlock_irq(&pcm->bus->bus_lock);
614         for (i = 3; i < 12; i++) {
615                 if (!(slots & (1 << i)))
616                         continue;
617                 for (cidx = 0; cidx < 4; cidx++) {
618                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
619                                 reg = get_slot_reg(pcm, cidx, i, r);
620                                 if (reg == 0xff) {
621                                         snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
622                                         continue;
623                                 }
624                                 if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
625                                         continue;
626                                 //printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
627                                 err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
628                                 if (err < 0)
629                                         snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
630                                 else
631                                         reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
632                         }
633                 }
634         }
635         pcm->aslots = slots;
636         return 0;
637 
638  error:
639         pcm->aslots = slots;
640         snd_ac97_pcm_close(pcm);
641         return err;
642 }
643 
644 EXPORT_SYMBOL(snd_ac97_pcm_open);
645 
646 /**
647  * snd_ac97_pcm_close - closes the given AC97 pcm
648  * @pcm: the ac97 pcm instance
649  *
650  * It frees the locked AC97 slots.
651  *
652  * Return: Zero.
653  */
654 int snd_ac97_pcm_close(struct ac97_pcm *pcm)
655 {
656         struct snd_ac97_bus *bus;
657         unsigned short slots = pcm->aslots;
658         int i, cidx;
659 
660 #ifdef CONFIG_SND_AC97_POWER_SAVE
661         int r = pcm->cur_dbl;
662         for (i = 3; i < 12; i++) {
663                 if (!(slots & (1 << i)))
664                         continue;
665                 for (cidx = 0; cidx < 4; cidx++) {
666                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
667                                 int reg = get_slot_reg(pcm, cidx, i, r);
668                                 snd_ac97_update_power(pcm->r[r].codec[cidx],
669                                                       reg, 0);
670                         }
671                 }
672         }
673 #endif
674 
675         bus = pcm->bus;
676         spin_lock_irq(&pcm->bus->bus_lock);
677         for (i = 3; i < 12; i++) {
678                 if (!(slots & (1 << i)))
679                         continue;
680                 for (cidx = 0; cidx < 4; cidx++)
681                         bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
682         }
683         pcm->aslots = 0;
684         pcm->cur_dbl = 0;
685         spin_unlock_irq(&pcm->bus->bus_lock);
686         return 0;
687 }
688 
689 EXPORT_SYMBOL(snd_ac97_pcm_close);
690 
691 static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
692                                           struct snd_pcm_hw_rule *rule)
693 {
694         struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
695         if (channels->min > 2) {
696                 static const struct snd_interval single_rates = {
697                         .min = 1,
698                         .max = 48000,
699                 };
700                 struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
701                 return snd_interval_refine(rate, &single_rates);
702         }
703         return 0;
704 }
705 
706 static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
707                                               struct snd_pcm_hw_rule *rule)
708 {
709         struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
710         if (rate->min > 48000) {
711                 static const struct snd_interval double_rate_channels = {
712                         .min = 2,
713                         .max = 2,
714                 };
715                 struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
716                 return snd_interval_refine(channels, &double_rate_channels);
717         }
718         return 0;
719 }
720 
721 /**
722  * snd_ac97_pcm_double_rate_rules - set double rate constraints
723  * @runtime: the runtime of the ac97 front playback pcm
724  *
725  * Installs the hardware constraint rules to prevent using double rates and
726  * more than two channels at the same time.
727  *
728  * Return: Zero if successful, or a negative error code on failure.
729  */
730 int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
731 {
732         int err;
733 
734         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
735                                   double_rate_hw_constraint_rate, NULL,
736                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
737         if (err < 0)
738                 return err;
739         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
740                                   double_rate_hw_constraint_channels, NULL,
741                                   SNDRV_PCM_HW_PARAM_RATE, -1);
742         return err;
743 }
744 
745 EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);
746 

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