Linux 2.6.31-rc6
[linux-2.6] / sound / pci / ac97 / ac97_pcm.c
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
31 #include <sound/core.h>
32 #include <sound/pcm.h>
33 #include <sound/control.h>
34 #include <sound/ac97_codec.h>
35 #include <sound/asoundef.h>
36 #include "ac97_id.h"
37 #include "ac97_local.h"
38
39 /*
40  *  PCM support
41  */
42
43 static unsigned char rate_reg_tables[2][4][9] = {
44 {
45   /* standard rates */
46   {
47         /* 3&4 front, 7&8 rear, 6&9 center/lfe */
48         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
49         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
50         0xff,                           /* slot 5 */
51         AC97_PCM_LFE_DAC_RATE,          /* slot 6 */
52         AC97_PCM_SURR_DAC_RATE,         /* slot 7 */
53         AC97_PCM_SURR_DAC_RATE,         /* slot 8 */
54         AC97_PCM_LFE_DAC_RATE,          /* slot 9 */
55         0xff,                           /* slot 10 */
56         0xff,                           /* slot 11 */
57   },
58   {
59         /* 7&8 front, 6&9 rear, 10&11 center/lfe */
60         0xff,                           /* slot 3 */
61         0xff,                           /* slot 4 */
62         0xff,                           /* slot 5 */
63         AC97_PCM_SURR_DAC_RATE,         /* slot 6 */
64         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
65         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
66         AC97_PCM_SURR_DAC_RATE,         /* slot 9 */
67         AC97_PCM_LFE_DAC_RATE,          /* slot 10 */
68         AC97_PCM_LFE_DAC_RATE,          /* slot 11 */
69   },
70   {
71         /* 6&9 front, 10&11 rear, 3&4 center/lfe */
72         AC97_PCM_LFE_DAC_RATE,          /* slot 3 */
73         AC97_PCM_LFE_DAC_RATE,          /* slot 4 */
74         0xff,                           /* slot 5 */
75         AC97_PCM_FRONT_DAC_RATE,        /* slot 6 */
76         0xff,                           /* slot 7 */
77         0xff,                           /* slot 8 */
78         AC97_PCM_FRONT_DAC_RATE,        /* slot 9 */
79         AC97_PCM_SURR_DAC_RATE,         /* slot 10 */
80         AC97_PCM_SURR_DAC_RATE,         /* slot 11 */
81   },
82   {
83         /* 10&11 front, 3&4 rear, 7&8 center/lfe */
84         AC97_PCM_SURR_DAC_RATE,         /* slot 3 */
85         AC97_PCM_SURR_DAC_RATE,         /* slot 4 */
86         0xff,                           /* slot 5 */
87         0xff,                           /* slot 6 */
88         AC97_PCM_LFE_DAC_RATE,          /* slot 7 */
89         AC97_PCM_LFE_DAC_RATE,          /* slot 8 */
90         0xff,                           /* slot 9 */
91         AC97_PCM_FRONT_DAC_RATE,        /* slot 10 */
92         AC97_PCM_FRONT_DAC_RATE,        /* slot 11 */
93   },
94 },
95 {
96   /* double rates */
97   {
98         /* 3&4 front, 7&8 front (t+1) */
99         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
100         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
101         0xff,                           /* slot 5 */
102         0xff,                           /* slot 6 */
103         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
104         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
105         0xff,                           /* slot 9 */
106         0xff,                           /* slot 10 */
107         0xff,                           /* slot 11 */
108   },
109   {
110         /* not specified in the specification */
111         0xff,                           /* slot 3 */
112         0xff,                           /* slot 4 */
113         0xff,                           /* slot 5 */
114         0xff,                           /* slot 6 */
115         0xff,                           /* slot 7 */
116         0xff,                           /* slot 8 */
117         0xff,                           /* slot 9 */
118         0xff,                           /* slot 10 */
119         0xff,                           /* slot 11 */
120   },
121   {
122         0xff,                           /* slot 3 */
123         0xff,                           /* slot 4 */
124         0xff,                           /* slot 5 */
125         0xff,                           /* slot 6 */
126         0xff,                           /* slot 7 */
127         0xff,                           /* slot 8 */
128         0xff,                           /* slot 9 */
129         0xff,                           /* slot 10 */
130         0xff,                           /* slot 11 */
131   },
132   {
133         0xff,                           /* slot 3 */
134         0xff,                           /* slot 4 */
135         0xff,                           /* slot 5 */
136         0xff,                           /* slot 6 */
137         0xff,                           /* slot 7 */
138         0xff,                           /* slot 8 */
139         0xff,                           /* slot 9 */
140         0xff,                           /* slot 10 */
141         0xff,                           /* slot 11 */
142   }
143 }};
144
145 /* FIXME: more various mappings for ADC? */
146 static unsigned char rate_cregs[9] = {
147         AC97_PCM_LR_ADC_RATE,   /* 3 */
148         AC97_PCM_LR_ADC_RATE,   /* 4 */
149         0xff,                   /* 5 */
150         AC97_PCM_MIC_ADC_RATE,  /* 6 */
151         0xff,                   /* 7 */
152         0xff,                   /* 8 */
153         0xff,                   /* 9 */
154         0xff,                   /* 10 */
155         0xff,                   /* 11 */
156 };
157
158 static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx,
159                                   unsigned short slot, int dbl)
160 {
161         if (slot < 3)
162                 return 0xff;
163         if (slot > 11)
164                 return 0xff;
165         if (pcm->spdif)
166                 return AC97_SPDIF; /* pseudo register */
167         if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK)
168                 return rate_reg_tables[dbl][pcm->r[dbl].rate_table[cidx]][slot - 3];
169         else
170                 return rate_cregs[slot - 3];
171 }
172
173 static int set_spdif_rate(struct snd_ac97 *ac97, unsigned short rate)
174 {
175         unsigned short old, bits, reg, mask;
176         unsigned int sbits;
177
178         if (! (ac97->ext_id & AC97_EI_SPDIF))
179                 return -ENODEV;
180
181         /* TODO: double rate support */
182         if (ac97->flags & AC97_CS_SPDIF) {
183                 switch (rate) {
184                 case 48000: bits = 0; break;
185                 case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
186                 default: /* invalid - disable output */
187                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
188                         return -EINVAL;
189                 }
190                 reg = AC97_CSR_SPDIF;
191                 mask = 1 << AC97_SC_SPSR_SHIFT;
192         } else {
193                 if (ac97->id == AC97_ID_CM9739 && rate != 48000) {
194                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
195                         return -EINVAL;
196                 }
197                 switch (rate) {
198                 case 44100: bits = AC97_SC_SPSR_44K; break;
199                 case 48000: bits = AC97_SC_SPSR_48K; break;
200                 case 32000: bits = AC97_SC_SPSR_32K; break;
201                 default: /* invalid - disable output */
202                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
203                         return -EINVAL;
204                 }
205                 reg = AC97_SPDIF;
206                 mask = AC97_SC_SPSR_MASK;
207         }
208
209         mutex_lock(&ac97->reg_mutex);
210         old = snd_ac97_read(ac97, reg) & mask;
211         if (old != bits) {
212                 snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
213                 snd_ac97_update_bits_nolock(ac97, reg, mask, bits);
214                 /* update the internal spdif bits */
215                 sbits = ac97->spdif_status;
216                 if (sbits & IEC958_AES0_PROFESSIONAL) {
217                         sbits &= ~IEC958_AES0_PRO_FS;
218                         switch (rate) {
219                         case 44100: sbits |= IEC958_AES0_PRO_FS_44100; break;
220                         case 48000: sbits |= IEC958_AES0_PRO_FS_48000; break;
221                         case 32000: sbits |= IEC958_AES0_PRO_FS_32000; break;
222                         }
223                 } else {
224                         sbits &= ~(IEC958_AES3_CON_FS << 24);
225                         switch (rate) {
226                         case 44100: sbits |= IEC958_AES3_CON_FS_44100<<24; break;
227                         case 48000: sbits |= IEC958_AES3_CON_FS_48000<<24; break;
228                         case 32000: sbits |= IEC958_AES3_CON_FS_32000<<24; break;
229                         }
230                 }
231                 ac97->spdif_status = sbits;
232         }
233         snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, AC97_EA_SPDIF);
234         mutex_unlock(&ac97->reg_mutex);
235         return 0;
236 }
237
238 /**
239  * snd_ac97_set_rate - change the rate of the given input/output.
240  * @ac97: the ac97 instance
241  * @reg: the register to change
242  * @rate: the sample rate to set
243  *
244  * Changes the rate of the given input/output on the codec.
245  * If the codec doesn't support VAR, the rate must be 48000 (except
246  * for SPDIF).
247  *
248  * The valid registers are AC97_PMC_MIC_ADC_RATE,
249  * AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
250  * AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
251  * if the codec supports them.
252  * AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
253  * status bits.
254  *
255  * Returns zero if successful, or a negative error code on failure.
256  */
257 int snd_ac97_set_rate(struct snd_ac97 *ac97, int reg, unsigned int rate)
258 {
259         int dbl;
260         unsigned int tmp;
261         
262         dbl = rate > 48000;
263         if (dbl) {
264                 if (!(ac97->flags & AC97_DOUBLE_RATE))
265                         return -EINVAL;
266                 if (reg != AC97_PCM_FRONT_DAC_RATE)
267                         return -EINVAL;
268         }
269
270         snd_ac97_update_power(ac97, reg, 1);
271         switch (reg) {
272         case AC97_PCM_MIC_ADC_RATE:
273                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)      /* MIC VRA */
274                         if (rate != 48000)
275                                 return -EINVAL;
276                 break;
277         case AC97_PCM_FRONT_DAC_RATE:
278         case AC97_PCM_LR_ADC_RATE:
279                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)      /* VRA */
280                         if (rate != 48000 && rate != 96000)
281                                 return -EINVAL;
282                 break;
283         case AC97_PCM_SURR_DAC_RATE:
284                 if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
285                         return -EINVAL;
286                 break;
287         case AC97_PCM_LFE_DAC_RATE:
288                 if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
289                         return -EINVAL;
290                 break;
291         case AC97_SPDIF:
292                 /* special case */
293                 return set_spdif_rate(ac97, rate);
294         default:
295                 return -EINVAL;
296         }
297         if (dbl)
298                 rate /= 2;
299         tmp = (rate * ac97->bus->clock) / 48000;
300         if (tmp > 65535)
301                 return -EINVAL;
302         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
303                 snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
304                                      AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
305         snd_ac97_update(ac97, reg, tmp & 0xffff);
306         snd_ac97_read(ac97, reg);
307         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
308                 /* Intel controllers require double rate data to be put in
309                  * slots 7+8
310                  */
311                 snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
312                                      AC97_GP_DRSS_MASK,
313                                      dbl ? AC97_GP_DRSS_78 : 0);
314                 snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
315         }
316         return 0;
317 }
318
319 EXPORT_SYMBOL(snd_ac97_set_rate);
320
321 static unsigned short get_pslots(struct snd_ac97 *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
322 {
323         if (!ac97_is_audio(ac97))
324                 return 0;
325         if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
326                 unsigned short slots = 0;
327                 if (ac97_is_rev22(ac97)) {
328                         /* Note: it's simply emulation of AMAP behaviour */
329                         u16 es;
330                         es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
331                         switch (ac97->addr) {
332                         case 1:
333                         case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
334                         case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
335                         }
336                         snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
337                 }
338                 switch (ac97->addr) {
339                 case 0:
340                         slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
341                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
342                                 slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
343                         if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
344                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
345                         if (ac97->ext_id & AC97_EI_SPDIF) {
346                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
347                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
348                                 else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
349                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
350                                 else
351                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
352                         }
353                         *rate_table = 0;
354                         break;
355                 case 1:
356                 case 2:
357                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
358                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
359                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
360                         if (ac97->ext_id & AC97_EI_SPDIF) {
361                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
362                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
363                                 else
364                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
365                         }
366                         *rate_table = 1;
367                         break;
368                 case 3:
369                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
370                         if (ac97->ext_id & AC97_EI_SPDIF)
371                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
372                         *rate_table = 2;
373                         break;
374                 }
375                 return slots;
376         } else {
377                 unsigned short slots;
378                 slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
379                 if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
380                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
381                 if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
382                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
383                 if (ac97->ext_id & AC97_EI_SPDIF) {
384                         if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
385                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
386                         else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
387                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
388                         else
389                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
390                 }
391                 *rate_table = 0;
392                 return slots;
393         }
394 }
395
396 static unsigned short get_cslots(struct snd_ac97 *ac97)
397 {
398         unsigned short slots;
399
400         if (!ac97_is_audio(ac97))
401                 return 0;
402         slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
403         slots |= (1<<AC97_SLOT_MIC);
404         return slots;
405 }
406
407 static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
408 {
409         int i, idx;
410         unsigned int rates = ~0;
411         unsigned char reg;
412
413         for (i = 3; i < 12; i++) {
414                 if (!(slots & (1 << i)))
415                         continue;
416                 reg = get_slot_reg(pcm, cidx, i, dbl);
417                 switch (reg) {
418                 case AC97_PCM_FRONT_DAC_RATE:   idx = AC97_RATES_FRONT_DAC; break;
419                 case AC97_PCM_SURR_DAC_RATE:    idx = AC97_RATES_SURR_DAC; break;
420                 case AC97_PCM_LFE_DAC_RATE:     idx = AC97_RATES_LFE_DAC; break;
421                 case AC97_PCM_LR_ADC_RATE:      idx = AC97_RATES_ADC; break;
422                 case AC97_PCM_MIC_ADC_RATE:     idx = AC97_RATES_MIC_ADC; break;
423                 default:                        idx = AC97_RATES_SPDIF; break;
424                 }
425                 rates &= pcm->r[dbl].codec[cidx]->rates[idx];
426         }
427         if (!dbl)
428                 rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
429                            SNDRV_PCM_RATE_96000);
430         return rates;
431 }
432
433 /**
434  * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
435  * @bus: the ac97 bus instance
436  * @pcms_count: count of PCMs to be assigned
437  * @pcms: PCMs to be assigned
438  *
439  * It assigns available AC97 slots for given PCMs. If none or only
440  * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
441  * are reduced and might be zero.
442  */
443 int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
444                         unsigned short pcms_count,
445                         const struct ac97_pcm *pcms)
446 {
447         int i, j, k;
448         const struct ac97_pcm *pcm;
449         struct ac97_pcm *rpcms, *rpcm;
450         unsigned short avail_slots[2][4];
451         unsigned char rate_table[2][4];
452         unsigned short tmp, slots;
453         unsigned short spdif_slots[4];
454         unsigned int rates;
455         struct snd_ac97 *codec;
456
457         rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
458         if (rpcms == NULL)
459                 return -ENOMEM;
460         memset(avail_slots, 0, sizeof(avail_slots));
461         memset(rate_table, 0, sizeof(rate_table));
462         memset(spdif_slots, 0, sizeof(spdif_slots));
463         for (i = 0; i < 4; i++) {
464                 codec = bus->codec[i];
465                 if (!codec)
466                         continue;
467                 avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
468                 avail_slots[1][i] = get_cslots(codec);
469                 if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
470                         for (j = 0; j < i; j++) {
471                                 if (bus->codec[j])
472                                         avail_slots[1][i] &= ~avail_slots[1][j];
473                         }
474                 }
475         }
476         /* first step - exclusive devices */
477         for (i = 0; i < pcms_count; i++) {
478                 pcm = &pcms[i];
479                 rpcm = &rpcms[i];
480                 /* low-level driver thinks that it's more clever */
481                 if (pcm->copy_flag) {
482                         *rpcm = *pcm;
483                         continue;
484                 }
485                 rpcm->stream = pcm->stream;
486                 rpcm->exclusive = pcm->exclusive;
487                 rpcm->spdif = pcm->spdif;
488                 rpcm->private_value = pcm->private_value;
489                 rpcm->bus = bus;
490                 rpcm->rates = ~0;
491                 slots = pcm->r[0].slots;
492                 for (j = 0; j < 4 && slots; j++) {
493                         if (!bus->codec[j])
494                                 continue;
495                         rates = ~0;
496                         if (pcm->spdif && pcm->stream == 0)
497                                 tmp = spdif_slots[j];
498                         else
499                                 tmp = avail_slots[pcm->stream][j];
500                         if (pcm->exclusive) {
501                                 /* exclusive access */
502                                 tmp &= slots;
503                                 for (k = 0; k < i; k++) {
504                                         if (rpcm->stream == rpcms[k].stream)
505                                                 tmp &= ~rpcms[k].r[0].rslots[j];
506                                 }
507                         } else {
508                                 /* non-exclusive access */
509                                 tmp &= pcm->r[0].slots;
510                         }
511                         if (tmp) {
512                                 rpcm->r[0].rslots[j] = tmp;
513                                 rpcm->r[0].codec[j] = bus->codec[j];
514                                 rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
515                                 if (bus->no_vra)
516                                         rates = SNDRV_PCM_RATE_48000;
517                                 else
518                                         rates = get_rates(rpcm, j, tmp, 0);
519                                 if (pcm->exclusive)
520                                         avail_slots[pcm->stream][j] &= ~tmp;
521                         }
522                         slots &= ~tmp;
523                         rpcm->r[0].slots |= tmp;
524                         rpcm->rates &= rates;
525                 }
526                 /* for double rate, we check the first codec only */
527                 if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
528                     bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
529                     rate_table[pcm->stream][0] == 0) {
530                         tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
531                               (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
532                         if ((tmp & pcm->r[1].slots) == tmp) {
533                                 rpcm->r[1].slots = tmp;
534                                 rpcm->r[1].rslots[0] = tmp;
535                                 rpcm->r[1].rate_table[0] = 0;
536                                 rpcm->r[1].codec[0] = bus->codec[0];
537                                 if (pcm->exclusive)
538                                         avail_slots[pcm->stream][0] &= ~tmp;
539                                 if (bus->no_vra)
540                                         rates = SNDRV_PCM_RATE_96000;
541                                 else
542                                         rates = get_rates(rpcm, 0, tmp, 1);
543                                 rpcm->rates |= rates;
544                         }
545                 }
546                 if (rpcm->rates == ~0)
547                         rpcm->rates = 0; /* not used */
548         }
549         bus->pcms_count = pcms_count;
550         bus->pcms = rpcms;
551         return 0;
552 }
553
554 EXPORT_SYMBOL(snd_ac97_pcm_assign);
555
556 /**
557  * snd_ac97_pcm_open - opens the given AC97 pcm
558  * @pcm: the ac97 pcm instance
559  * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
560  * @cfg: output stream characteristics
561  * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
562  *
563  * It locks the specified slots and sets the given rate to AC97 registers.
564  */
565 int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
566                       enum ac97_pcm_cfg cfg, unsigned short slots)
567 {
568         struct snd_ac97_bus *bus;
569         int i, cidx, r, ok_flag;
570         unsigned int reg_ok[4] = {0,0,0,0};
571         unsigned char reg;
572         int err = 0;
573
574         r = rate > 48000;
575         bus = pcm->bus;
576         if (cfg == AC97_PCM_CFG_SPDIF) {
577                 for (cidx = 0; cidx < 4; cidx++)
578                         if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
579                                 err = set_spdif_rate(bus->codec[cidx], rate);
580                                 if (err < 0)
581                                         return err;
582                         }
583         }
584         spin_lock_irq(&pcm->bus->bus_lock);
585         for (i = 3; i < 12; i++) {
586                 if (!(slots & (1 << i)))
587                         continue;
588                 ok_flag = 0;
589                 for (cidx = 0; cidx < 4; cidx++) {
590                         if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
591                                 spin_unlock_irq(&pcm->bus->bus_lock);
592                                 err = -EBUSY;
593                                 goto error;
594                         }
595                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
596                                 bus->used_slots[pcm->stream][cidx] |= (1 << i);
597                                 ok_flag++;
598                         }
599                 }
600                 if (!ok_flag) {
601                         spin_unlock_irq(&pcm->bus->bus_lock);
602                         snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
603                         err = -EAGAIN;
604                         goto error;
605                 }
606         }
607         pcm->cur_dbl = r;
608         spin_unlock_irq(&pcm->bus->bus_lock);
609         for (i = 3; i < 12; i++) {
610                 if (!(slots & (1 << i)))
611                         continue;
612                 for (cidx = 0; cidx < 4; cidx++) {
613                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
614                                 reg = get_slot_reg(pcm, cidx, i, r);
615                                 if (reg == 0xff) {
616                                         snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
617                                         continue;
618                                 }
619                                 if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
620                                         continue;
621                                 //printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
622                                 err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
623                                 if (err < 0)
624                                         snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
625                                 else
626                                         reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
627                         }
628                 }
629         }
630         pcm->aslots = slots;
631         return 0;
632
633  error:
634         pcm->aslots = slots;
635         snd_ac97_pcm_close(pcm);
636         return err;
637 }
638
639 EXPORT_SYMBOL(snd_ac97_pcm_open);
640
641 /**
642  * snd_ac97_pcm_close - closes the given AC97 pcm
643  * @pcm: the ac97 pcm instance
644  *
645  * It frees the locked AC97 slots.
646  */
647 int snd_ac97_pcm_close(struct ac97_pcm *pcm)
648 {
649         struct snd_ac97_bus *bus;
650         unsigned short slots = pcm->aslots;
651         int i, cidx;
652
653 #ifdef CONFIG_SND_AC97_POWER_SAVE
654         int r = pcm->cur_dbl;
655         for (i = 3; i < 12; i++) {
656                 if (!(slots & (1 << i)))
657                         continue;
658                 for (cidx = 0; cidx < 4; cidx++) {
659                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
660                                 int reg = get_slot_reg(pcm, cidx, i, r);
661                                 snd_ac97_update_power(pcm->r[r].codec[cidx],
662                                                       reg, 0);
663                         }
664                 }
665         }
666 #endif
667
668         bus = pcm->bus;
669         spin_lock_irq(&pcm->bus->bus_lock);
670         for (i = 3; i < 12; i++) {
671                 if (!(slots & (1 << i)))
672                         continue;
673                 for (cidx = 0; cidx < 4; cidx++)
674                         bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
675         }
676         pcm->aslots = 0;
677         pcm->cur_dbl = 0;
678         spin_unlock_irq(&pcm->bus->bus_lock);
679         return 0;
680 }
681
682 EXPORT_SYMBOL(snd_ac97_pcm_close);
683
684 static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
685                                           struct snd_pcm_hw_rule *rule)
686 {
687         struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
688         if (channels->min > 2) {
689                 static const struct snd_interval single_rates = {
690                         .min = 1,
691                         .max = 48000,
692                 };
693                 struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
694                 return snd_interval_refine(rate, &single_rates);
695         }
696         return 0;
697 }
698
699 static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
700                                               struct snd_pcm_hw_rule *rule)
701 {
702         struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
703         if (rate->min > 48000) {
704                 static const struct snd_interval double_rate_channels = {
705                         .min = 2,
706                         .max = 2,
707                 };
708                 struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
709                 return snd_interval_refine(channels, &double_rate_channels);
710         }
711         return 0;
712 }
713
714 /**
715  * snd_ac97_pcm_double_rate_rules - set double rate constraints
716  * @runtime: the runtime of the ac97 front playback pcm
717  *
718  * Installs the hardware constraint rules to prevent using double rates and
719  * more than two channels at the same time.
720  */
721 int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
722 {
723         int err;
724
725         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
726                                   double_rate_hw_constraint_rate, NULL,
727                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
728         if (err < 0)
729                 return err;
730         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
731                                   double_rate_hw_constraint_channels, NULL,
732                                   SNDRV_PCM_HW_PARAM_RATE, -1);
733         return err;
734 }
735
736 EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);