ALSA: ac97: More constifications
[muen/linux.git] / sound / pci / ac97 / ac97_pcm.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *  Universal interface for Audio Codec '97
5  *
6  *  For more details look to AC '97 component specification revision 2.2
7  *  by Intel Corporation (http://developer.intel.com) and to datasheets
8  *  for specific codecs.
9  */
10
11 #include <linux/delay.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/mutex.h>
15 #include <linux/export.h>
16
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/control.h>
20 #include <sound/ac97_codec.h>
21 #include <sound/asoundef.h>
22 #include "ac97_id.h"
23 #include "ac97_local.h"
24
25 /*
26  *  PCM support
27  */
28
29 static const unsigned char rate_reg_tables[2][4][9] = {
30 {
31   /* standard rates */
32   {
33         /* 3&4 front, 7&8 rear, 6&9 center/lfe */
34         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
35         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
36         0xff,                           /* slot 5 */
37         AC97_PCM_LFE_DAC_RATE,          /* slot 6 */
38         AC97_PCM_SURR_DAC_RATE,         /* slot 7 */
39         AC97_PCM_SURR_DAC_RATE,         /* slot 8 */
40         AC97_PCM_LFE_DAC_RATE,          /* slot 9 */
41         0xff,                           /* slot 10 */
42         0xff,                           /* slot 11 */
43   },
44   {
45         /* 7&8 front, 6&9 rear, 10&11 center/lfe */
46         0xff,                           /* slot 3 */
47         0xff,                           /* slot 4 */
48         0xff,                           /* slot 5 */
49         AC97_PCM_SURR_DAC_RATE,         /* slot 6 */
50         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
51         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
52         AC97_PCM_SURR_DAC_RATE,         /* slot 9 */
53         AC97_PCM_LFE_DAC_RATE,          /* slot 10 */
54         AC97_PCM_LFE_DAC_RATE,          /* slot 11 */
55   },
56   {
57         /* 6&9 front, 10&11 rear, 3&4 center/lfe */
58         AC97_PCM_LFE_DAC_RATE,          /* slot 3 */
59         AC97_PCM_LFE_DAC_RATE,          /* slot 4 */
60         0xff,                           /* slot 5 */
61         AC97_PCM_FRONT_DAC_RATE,        /* slot 6 */
62         0xff,                           /* slot 7 */
63         0xff,                           /* slot 8 */
64         AC97_PCM_FRONT_DAC_RATE,        /* slot 9 */
65         AC97_PCM_SURR_DAC_RATE,         /* slot 10 */
66         AC97_PCM_SURR_DAC_RATE,         /* slot 11 */
67   },
68   {
69         /* 10&11 front, 3&4 rear, 7&8 center/lfe */
70         AC97_PCM_SURR_DAC_RATE,         /* slot 3 */
71         AC97_PCM_SURR_DAC_RATE,         /* slot 4 */
72         0xff,                           /* slot 5 */
73         0xff,                           /* slot 6 */
74         AC97_PCM_LFE_DAC_RATE,          /* slot 7 */
75         AC97_PCM_LFE_DAC_RATE,          /* slot 8 */
76         0xff,                           /* slot 9 */
77         AC97_PCM_FRONT_DAC_RATE,        /* slot 10 */
78         AC97_PCM_FRONT_DAC_RATE,        /* slot 11 */
79   },
80 },
81 {
82   /* double rates */
83   {
84         /* 3&4 front, 7&8 front (t+1) */
85         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
86         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
87         0xff,                           /* slot 5 */
88         0xff,                           /* slot 6 */
89         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
90         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
91         0xff,                           /* slot 9 */
92         0xff,                           /* slot 10 */
93         0xff,                           /* slot 11 */
94   },
95   {
96         /* not specified in the specification */
97         0xff,                           /* slot 3 */
98         0xff,                           /* slot 4 */
99         0xff,                           /* slot 5 */
100         0xff,                           /* slot 6 */
101         0xff,                           /* slot 7 */
102         0xff,                           /* slot 8 */
103         0xff,                           /* slot 9 */
104         0xff,                           /* slot 10 */
105         0xff,                           /* slot 11 */
106   },
107   {
108         0xff,                           /* slot 3 */
109         0xff,                           /* slot 4 */
110         0xff,                           /* slot 5 */
111         0xff,                           /* slot 6 */
112         0xff,                           /* slot 7 */
113         0xff,                           /* slot 8 */
114         0xff,                           /* slot 9 */
115         0xff,                           /* slot 10 */
116         0xff,                           /* slot 11 */
117   },
118   {
119         0xff,                           /* slot 3 */
120         0xff,                           /* slot 4 */
121         0xff,                           /* slot 5 */
122         0xff,                           /* slot 6 */
123         0xff,                           /* slot 7 */
124         0xff,                           /* slot 8 */
125         0xff,                           /* slot 9 */
126         0xff,                           /* slot 10 */
127         0xff,                           /* slot 11 */
128   }
129 }};
130
131 /* FIXME: more various mappings for ADC? */
132 static const unsigned char rate_cregs[9] = {
133         AC97_PCM_LR_ADC_RATE,   /* 3 */
134         AC97_PCM_LR_ADC_RATE,   /* 4 */
135         0xff,                   /* 5 */
136         AC97_PCM_MIC_ADC_RATE,  /* 6 */
137         0xff,                   /* 7 */
138         0xff,                   /* 8 */
139         0xff,                   /* 9 */
140         0xff,                   /* 10 */
141         0xff,                   /* 11 */
142 };
143
144 static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx,
145                                   unsigned short slot, int dbl)
146 {
147         if (slot < 3)
148                 return 0xff;
149         if (slot > 11)
150                 return 0xff;
151         if (pcm->spdif)
152                 return AC97_SPDIF; /* pseudo register */
153         if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK)
154                 return rate_reg_tables[dbl][pcm->r[dbl].rate_table[cidx]][slot - 3];
155         else
156                 return rate_cregs[slot - 3];
157 }
158
159 static int set_spdif_rate(struct snd_ac97 *ac97, unsigned short rate)
160 {
161         unsigned short old, bits, reg, mask;
162         unsigned int sbits;
163
164         if (! (ac97->ext_id & AC97_EI_SPDIF))
165                 return -ENODEV;
166
167         /* TODO: double rate support */
168         if (ac97->flags & AC97_CS_SPDIF) {
169                 switch (rate) {
170                 case 48000: bits = 0; break;
171                 case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
172                 default: /* invalid - disable output */
173                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
174                         return -EINVAL;
175                 }
176                 reg = AC97_CSR_SPDIF;
177                 mask = 1 << AC97_SC_SPSR_SHIFT;
178         } else {
179                 if (ac97->id == AC97_ID_CM9739 && rate != 48000) {
180                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
181                         return -EINVAL;
182                 }
183                 switch (rate) {
184                 case 44100: bits = AC97_SC_SPSR_44K; break;
185                 case 48000: bits = AC97_SC_SPSR_48K; break;
186                 case 32000: bits = AC97_SC_SPSR_32K; 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_SPDIF;
192                 mask = AC97_SC_SPSR_MASK;
193         }
194
195         mutex_lock(&ac97->reg_mutex);
196         old = snd_ac97_read(ac97, reg) & mask;
197         if (old != bits) {
198                 snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
199                 snd_ac97_update_bits_nolock(ac97, reg, mask, bits);
200                 /* update the internal spdif bits */
201                 sbits = ac97->spdif_status;
202                 if (sbits & IEC958_AES0_PROFESSIONAL) {
203                         sbits &= ~IEC958_AES0_PRO_FS;
204                         switch (rate) {
205                         case 44100: sbits |= IEC958_AES0_PRO_FS_44100; break;
206                         case 48000: sbits |= IEC958_AES0_PRO_FS_48000; break;
207                         case 32000: sbits |= IEC958_AES0_PRO_FS_32000; break;
208                         }
209                 } else {
210                         sbits &= ~(IEC958_AES3_CON_FS << 24);
211                         switch (rate) {
212                         case 44100: sbits |= IEC958_AES3_CON_FS_44100<<24; break;
213                         case 48000: sbits |= IEC958_AES3_CON_FS_48000<<24; break;
214                         case 32000: sbits |= IEC958_AES3_CON_FS_32000<<24; break;
215                         }
216                 }
217                 ac97->spdif_status = sbits;
218         }
219         snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, AC97_EA_SPDIF);
220         mutex_unlock(&ac97->reg_mutex);
221         return 0;
222 }
223
224 /**
225  * snd_ac97_set_rate - change the rate of the given input/output.
226  * @ac97: the ac97 instance
227  * @reg: the register to change
228  * @rate: the sample rate to set
229  *
230  * Changes the rate of the given input/output on the codec.
231  * If the codec doesn't support VAR, the rate must be 48000 (except
232  * for SPDIF).
233  *
234  * The valid registers are AC97_PMC_MIC_ADC_RATE,
235  * AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
236  * AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
237  * if the codec supports them.
238  * AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
239  * status bits.
240  *
241  * Return: Zero if successful, or a negative error code on failure.
242  */
243 int snd_ac97_set_rate(struct snd_ac97 *ac97, int reg, unsigned int rate)
244 {
245         int dbl;
246         unsigned int tmp;
247         
248         dbl = rate > 48000;
249         if (dbl) {
250                 if (!(ac97->flags & AC97_DOUBLE_RATE))
251                         return -EINVAL;
252                 if (reg != AC97_PCM_FRONT_DAC_RATE)
253                         return -EINVAL;
254         }
255
256         snd_ac97_update_power(ac97, reg, 1);
257         switch (reg) {
258         case AC97_PCM_MIC_ADC_RATE:
259                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)      /* MIC VRA */
260                         if (rate != 48000)
261                                 return -EINVAL;
262                 break;
263         case AC97_PCM_FRONT_DAC_RATE:
264         case AC97_PCM_LR_ADC_RATE:
265                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)      /* VRA */
266                         if (rate != 48000 && rate != 96000)
267                                 return -EINVAL;
268                 break;
269         case AC97_PCM_SURR_DAC_RATE:
270                 if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
271                         return -EINVAL;
272                 break;
273         case AC97_PCM_LFE_DAC_RATE:
274                 if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
275                         return -EINVAL;
276                 break;
277         case AC97_SPDIF:
278                 /* special case */
279                 return set_spdif_rate(ac97, rate);
280         default:
281                 return -EINVAL;
282         }
283         if (dbl)
284                 rate /= 2;
285         tmp = (rate * ac97->bus->clock) / 48000;
286         if (tmp > 65535)
287                 return -EINVAL;
288         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
289                 snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
290                                      AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
291         snd_ac97_update(ac97, reg, tmp & 0xffff);
292         snd_ac97_read(ac97, reg);
293         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
294                 /* Intel controllers require double rate data to be put in
295                  * slots 7+8
296                  */
297                 snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
298                                      AC97_GP_DRSS_MASK,
299                                      dbl ? AC97_GP_DRSS_78 : 0);
300                 snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
301         }
302         return 0;
303 }
304
305 EXPORT_SYMBOL(snd_ac97_set_rate);
306
307 static unsigned short get_pslots(struct snd_ac97 *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
308 {
309         if (!ac97_is_audio(ac97))
310                 return 0;
311         if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
312                 unsigned short slots = 0;
313                 if (ac97_is_rev22(ac97)) {
314                         /* Note: it's simply emulation of AMAP behaviour */
315                         u16 es;
316                         es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
317                         switch (ac97->addr) {
318                         case 1:
319                         case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
320                         case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
321                         }
322                         snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
323                 }
324                 switch (ac97->addr) {
325                 case 0:
326                         slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
327                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
328                                 slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
329                         if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
330                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
331                         if (ac97->ext_id & AC97_EI_SPDIF) {
332                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
333                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
334                                 else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
335                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
336                                 else
337                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
338                         }
339                         *rate_table = 0;
340                         break;
341                 case 1:
342                 case 2:
343                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
344                         if (ac97->scaps & AC97_SCAP_SURROUND_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_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
349                                 else
350                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
351                         }
352                         *rate_table = 1;
353                         break;
354                 case 3:
355                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
356                         if (ac97->ext_id & AC97_EI_SPDIF)
357                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
358                         *rate_table = 2;
359                         break;
360                 }
361                 return slots;
362         } else {
363                 unsigned short slots;
364                 slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
365                 if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
366                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
367                 if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
368                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
369                 if (ac97->ext_id & AC97_EI_SPDIF) {
370                         if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
371                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
372                         else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
373                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
374                         else
375                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
376                 }
377                 *rate_table = 0;
378                 return slots;
379         }
380 }
381
382 static unsigned short get_cslots(struct snd_ac97 *ac97)
383 {
384         unsigned short slots;
385
386         if (!ac97_is_audio(ac97))
387                 return 0;
388         slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
389         slots |= (1<<AC97_SLOT_MIC);
390         return slots;
391 }
392
393 static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
394 {
395         int i, idx;
396         unsigned int rates = ~0;
397         unsigned char reg;
398
399         for (i = 3; i < 12; i++) {
400                 if (!(slots & (1 << i)))
401                         continue;
402                 reg = get_slot_reg(pcm, cidx, i, dbl);
403                 switch (reg) {
404                 case AC97_PCM_FRONT_DAC_RATE:   idx = AC97_RATES_FRONT_DAC; break;
405                 case AC97_PCM_SURR_DAC_RATE:    idx = AC97_RATES_SURR_DAC; break;
406                 case AC97_PCM_LFE_DAC_RATE:     idx = AC97_RATES_LFE_DAC; break;
407                 case AC97_PCM_LR_ADC_RATE:      idx = AC97_RATES_ADC; break;
408                 case AC97_PCM_MIC_ADC_RATE:     idx = AC97_RATES_MIC_ADC; break;
409                 default:                        idx = AC97_RATES_SPDIF; break;
410                 }
411                 rates &= pcm->r[dbl].codec[cidx]->rates[idx];
412         }
413         if (!dbl)
414                 rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
415                            SNDRV_PCM_RATE_96000);
416         return rates;
417 }
418
419 /**
420  * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
421  * @bus: the ac97 bus instance
422  * @pcms_count: count of PCMs to be assigned
423  * @pcms: PCMs to be assigned
424  *
425  * It assigns available AC97 slots for given PCMs. If none or only
426  * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
427  * are reduced and might be zero.
428  *
429  * Return: Zero if successful, or a negative error code on failure.
430  */
431 int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
432                         unsigned short pcms_count,
433                         const struct ac97_pcm *pcms)
434 {
435         int i, j, k;
436         const struct ac97_pcm *pcm;
437         struct ac97_pcm *rpcms, *rpcm;
438         unsigned short avail_slots[2][4];
439         unsigned char rate_table[2][4];
440         unsigned short tmp, slots;
441         unsigned short spdif_slots[4];
442         unsigned int rates;
443         struct snd_ac97 *codec;
444
445         rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
446         if (rpcms == NULL)
447                 return -ENOMEM;
448         memset(avail_slots, 0, sizeof(avail_slots));
449         memset(rate_table, 0, sizeof(rate_table));
450         memset(spdif_slots, 0, sizeof(spdif_slots));
451         for (i = 0; i < 4; i++) {
452                 codec = bus->codec[i];
453                 if (!codec)
454                         continue;
455                 avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
456                 avail_slots[1][i] = get_cslots(codec);
457                 if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
458                         for (j = 0; j < i; j++) {
459                                 if (bus->codec[j])
460                                         avail_slots[1][i] &= ~avail_slots[1][j];
461                         }
462                 }
463         }
464         /* first step - exclusive devices */
465         for (i = 0; i < pcms_count; i++) {
466                 pcm = &pcms[i];
467                 rpcm = &rpcms[i];
468                 /* low-level driver thinks that it's more clever */
469                 if (pcm->copy_flag) {
470                         *rpcm = *pcm;
471                         continue;
472                 }
473                 rpcm->stream = pcm->stream;
474                 rpcm->exclusive = pcm->exclusive;
475                 rpcm->spdif = pcm->spdif;
476                 rpcm->private_value = pcm->private_value;
477                 rpcm->bus = bus;
478                 rpcm->rates = ~0;
479                 slots = pcm->r[0].slots;
480                 for (j = 0; j < 4 && slots; j++) {
481                         if (!bus->codec[j])
482                                 continue;
483                         rates = ~0;
484                         if (pcm->spdif && pcm->stream == 0)
485                                 tmp = spdif_slots[j];
486                         else
487                                 tmp = avail_slots[pcm->stream][j];
488                         if (pcm->exclusive) {
489                                 /* exclusive access */
490                                 tmp &= slots;
491                                 for (k = 0; k < i; k++) {
492                                         if (rpcm->stream == rpcms[k].stream)
493                                                 tmp &= ~rpcms[k].r[0].rslots[j];
494                                 }
495                         } else {
496                                 /* non-exclusive access */
497                                 tmp &= pcm->r[0].slots;
498                         }
499                         if (tmp) {
500                                 rpcm->r[0].rslots[j] = tmp;
501                                 rpcm->r[0].codec[j] = bus->codec[j];
502                                 rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
503                                 if (bus->no_vra)
504                                         rates = SNDRV_PCM_RATE_48000;
505                                 else
506                                         rates = get_rates(rpcm, j, tmp, 0);
507                                 if (pcm->exclusive)
508                                         avail_slots[pcm->stream][j] &= ~tmp;
509                         }
510                         slots &= ~tmp;
511                         rpcm->r[0].slots |= tmp;
512                         rpcm->rates &= rates;
513                 }
514                 /* for double rate, we check the first codec only */
515                 if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
516                     bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
517                     rate_table[pcm->stream][0] == 0) {
518                         tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
519                               (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
520                         if ((tmp & pcm->r[1].slots) == tmp) {
521                                 rpcm->r[1].slots = tmp;
522                                 rpcm->r[1].rslots[0] = tmp;
523                                 rpcm->r[1].rate_table[0] = 0;
524                                 rpcm->r[1].codec[0] = bus->codec[0];
525                                 if (pcm->exclusive)
526                                         avail_slots[pcm->stream][0] &= ~tmp;
527                                 if (bus->no_vra)
528                                         rates = SNDRV_PCM_RATE_96000;
529                                 else
530                                         rates = get_rates(rpcm, 0, tmp, 1);
531                                 rpcm->rates |= rates;
532                         }
533                 }
534                 if (rpcm->rates == ~0)
535                         rpcm->rates = 0; /* not used */
536         }
537         bus->pcms_count = pcms_count;
538         bus->pcms = rpcms;
539         return 0;
540 }
541
542 EXPORT_SYMBOL(snd_ac97_pcm_assign);
543
544 /**
545  * snd_ac97_pcm_open - opens the given AC97 pcm
546  * @pcm: the ac97 pcm instance
547  * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
548  * @cfg: output stream characteristics
549  * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
550  *
551  * It locks the specified slots and sets the given rate to AC97 registers.
552  *
553  * Return: Zero if successful, or a negative error code on failure.
554  */
555 int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
556                       enum ac97_pcm_cfg cfg, unsigned short slots)
557 {
558         struct snd_ac97_bus *bus;
559         int i, cidx, r, ok_flag;
560         unsigned int reg_ok[4] = {0,0,0,0};
561         unsigned char reg;
562         int err = 0;
563
564         r = rate > 48000;
565         bus = pcm->bus;
566         if (cfg == AC97_PCM_CFG_SPDIF) {
567                 for (cidx = 0; cidx < 4; cidx++)
568                         if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
569                                 err = set_spdif_rate(bus->codec[cidx], rate);
570                                 if (err < 0)
571                                         return err;
572                         }
573         }
574         spin_lock_irq(&pcm->bus->bus_lock);
575         for (i = 3; i < 12; i++) {
576                 if (!(slots & (1 << i)))
577                         continue;
578                 ok_flag = 0;
579                 for (cidx = 0; cidx < 4; cidx++) {
580                         if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
581                                 spin_unlock_irq(&pcm->bus->bus_lock);
582                                 err = -EBUSY;
583                                 goto error;
584                         }
585                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
586                                 bus->used_slots[pcm->stream][cidx] |= (1 << i);
587                                 ok_flag++;
588                         }
589                 }
590                 if (!ok_flag) {
591                         spin_unlock_irq(&pcm->bus->bus_lock);
592                         dev_err(bus->card->dev,
593                                 "cannot find configuration for AC97 slot %i\n",
594                                 i);
595                         err = -EAGAIN;
596                         goto error;
597                 }
598         }
599         pcm->cur_dbl = r;
600         spin_unlock_irq(&pcm->bus->bus_lock);
601         for (i = 3; i < 12; i++) {
602                 if (!(slots & (1 << i)))
603                         continue;
604                 for (cidx = 0; cidx < 4; cidx++) {
605                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
606                                 reg = get_slot_reg(pcm, cidx, i, r);
607                                 if (reg == 0xff) {
608                                         dev_err(bus->card->dev,
609                                                 "invalid AC97 slot %i?\n", i);
610                                         continue;
611                                 }
612                                 if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
613                                         continue;
614                                 dev_dbg(bus->card->dev,
615                                         "setting ac97 reg 0x%x to rate %d\n",
616                                         reg, rate);
617                                 err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
618                                 if (err < 0)
619                                         dev_err(bus->card->dev,
620                                                 "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n",
621                                                 cidx, reg, rate, err);
622                                 else
623                                         reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
624                         }
625                 }
626         }
627         pcm->aslots = slots;
628         return 0;
629
630  error:
631         pcm->aslots = slots;
632         snd_ac97_pcm_close(pcm);
633         return err;
634 }
635
636 EXPORT_SYMBOL(snd_ac97_pcm_open);
637
638 /**
639  * snd_ac97_pcm_close - closes the given AC97 pcm
640  * @pcm: the ac97 pcm instance
641  *
642  * It frees the locked AC97 slots.
643  *
644  * Return: Zero.
645  */
646 int snd_ac97_pcm_close(struct ac97_pcm *pcm)
647 {
648         struct snd_ac97_bus *bus;
649         unsigned short slots = pcm->aslots;
650         int i, cidx;
651
652 #ifdef CONFIG_SND_AC97_POWER_SAVE
653         int r = pcm->cur_dbl;
654         for (i = 3; i < 12; i++) {
655                 if (!(slots & (1 << i)))
656                         continue;
657                 for (cidx = 0; cidx < 4; cidx++) {
658                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
659                                 int reg = get_slot_reg(pcm, cidx, i, r);
660                                 snd_ac97_update_power(pcm->r[r].codec[cidx],
661                                                       reg, 0);
662                         }
663                 }
664         }
665 #endif
666
667         bus = pcm->bus;
668         spin_lock_irq(&pcm->bus->bus_lock);
669         for (i = 3; i < 12; i++) {
670                 if (!(slots & (1 << i)))
671                         continue;
672                 for (cidx = 0; cidx < 4; cidx++)
673                         bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
674         }
675         pcm->aslots = 0;
676         pcm->cur_dbl = 0;
677         spin_unlock_irq(&pcm->bus->bus_lock);
678         return 0;
679 }
680
681 EXPORT_SYMBOL(snd_ac97_pcm_close);
682
683 static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
684                                           struct snd_pcm_hw_rule *rule)
685 {
686         struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
687         if (channels->min > 2) {
688                 static const struct snd_interval single_rates = {
689                         .min = 1,
690                         .max = 48000,
691                 };
692                 struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
693                 return snd_interval_refine(rate, &single_rates);
694         }
695         return 0;
696 }
697
698 static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
699                                               struct snd_pcm_hw_rule *rule)
700 {
701         struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
702         if (rate->min > 48000) {
703                 static const struct snd_interval double_rate_channels = {
704                         .min = 2,
705                         .max = 2,
706                 };
707                 struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
708                 return snd_interval_refine(channels, &double_rate_channels);
709         }
710         return 0;
711 }
712
713 /**
714  * snd_ac97_pcm_double_rate_rules - set double rate constraints
715  * @runtime: the runtime of the ac97 front playback pcm
716  *
717  * Installs the hardware constraint rules to prevent using double rates and
718  * more than two channels at the same time.
719  *
720  * Return: Zero if successful, or a negative error code on failure.
721  */
722 int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
723 {
724         int err;
725
726         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
727                                   double_rate_hw_constraint_rate, NULL,
728                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
729         if (err < 0)
730                 return err;
731         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
732                                   double_rate_hw_constraint_channels, NULL,
733                                   SNDRV_PCM_HW_PARAM_RATE, -1);
734         return err;
735 }
736
737 EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);