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 
get_slot_reg(struct ac97_pcm * pcm,unsigned short cidx,unsigned short slot,int dbl)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 
set_spdif_rate(struct snd_ac97 * ac97,unsigned short rate)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  * Returns zero if successful, or a negative error code on failure.
257  */
snd_ac97_set_rate(struct snd_ac97 * ac97,int reg,unsigned int rate)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 
get_pslots(struct snd_ac97 * ac97,unsigned char * rate_table,unsigned short * spdif_slots)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 
get_cslots(struct snd_ac97 * ac97)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 
get_rates(struct ac97_pcm * pcm,unsigned int cidx,unsigned short slots,int dbl)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  */
snd_ac97_pcm_assign(struct snd_ac97_bus * bus,unsigned short pcms_count,const struct ac97_pcm * pcms)444 int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
445 			unsigned short pcms_count,
446 			const struct ac97_pcm *pcms)
447 {
448 	int i, j, k;
449 	const struct ac97_pcm *pcm;
450 	struct ac97_pcm *rpcms, *rpcm;
451 	unsigned short avail_slots[2][4];
452 	unsigned char rate_table[2][4];
453 	unsigned short tmp, slots;
454 	unsigned short spdif_slots[4];
455 	unsigned int rates;
456 	struct snd_ac97 *codec;
457 
458 	rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
459 	if (rpcms == NULL)
460 		return -ENOMEM;
461 	memset(avail_slots, 0, sizeof(avail_slots));
462 	memset(rate_table, 0, sizeof(rate_table));
463 	memset(spdif_slots, 0, sizeof(spdif_slots));
464 	for (i = 0; i < 4; i++) {
465 		codec = bus->codec[i];
466 		if (!codec)
467 			continue;
468 		avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
469 		avail_slots[1][i] = get_cslots(codec);
470 		if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
471 			for (j = 0; j < i; j++) {
472 				if (bus->codec[j])
473 					avail_slots[1][i] &= ~avail_slots[1][j];
474 			}
475 		}
476 	}
477 	/* first step - exclusive devices */
478 	for (i = 0; i < pcms_count; i++) {
479 		pcm = &pcms[i];
480 		rpcm = &rpcms[i];
481 		/* low-level driver thinks that it's more clever */
482 		if (pcm->copy_flag) {
483 			*rpcm = *pcm;
484 			continue;
485 		}
486 		rpcm->stream = pcm->stream;
487 		rpcm->exclusive = pcm->exclusive;
488 		rpcm->spdif = pcm->spdif;
489 		rpcm->private_value = pcm->private_value;
490 		rpcm->bus = bus;
491 		rpcm->rates = ~0;
492 		slots = pcm->r[0].slots;
493 		for (j = 0; j < 4 && slots; j++) {
494 			if (!bus->codec[j])
495 				continue;
496 			rates = ~0;
497 			if (pcm->spdif && pcm->stream == 0)
498 				tmp = spdif_slots[j];
499 			else
500 				tmp = avail_slots[pcm->stream][j];
501 			if (pcm->exclusive) {
502 				/* exclusive access */
503 				tmp &= slots;
504 				for (k = 0; k < i; k++) {
505 					if (rpcm->stream == rpcms[k].stream)
506 						tmp &= ~rpcms[k].r[0].rslots[j];
507 				}
508 			} else {
509 				/* non-exclusive access */
510 				tmp &= pcm->r[0].slots;
511 			}
512 			if (tmp) {
513 				rpcm->r[0].rslots[j] = tmp;
514 				rpcm->r[0].codec[j] = bus->codec[j];
515 				rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
516 				if (bus->no_vra)
517 					rates = SNDRV_PCM_RATE_48000;
518 				else
519 					rates = get_rates(rpcm, j, tmp, 0);
520 				if (pcm->exclusive)
521 					avail_slots[pcm->stream][j] &= ~tmp;
522 			}
523 			slots &= ~tmp;
524 			rpcm->r[0].slots |= tmp;
525 			rpcm->rates &= rates;
526 		}
527 		/* for double rate, we check the first codec only */
528 		if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
529 		    bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
530 		    rate_table[pcm->stream][0] == 0) {
531 			tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
532 			      (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
533 			if ((tmp & pcm->r[1].slots) == tmp) {
534 				rpcm->r[1].slots = tmp;
535 				rpcm->r[1].rslots[0] = tmp;
536 				rpcm->r[1].rate_table[0] = 0;
537 				rpcm->r[1].codec[0] = bus->codec[0];
538 				if (pcm->exclusive)
539 					avail_slots[pcm->stream][0] &= ~tmp;
540 				if (bus->no_vra)
541 					rates = SNDRV_PCM_RATE_96000;
542 				else
543 					rates = get_rates(rpcm, 0, tmp, 1);
544 				rpcm->rates |= rates;
545 			}
546 		}
547 		if (rpcm->rates == ~0)
548 			rpcm->rates = 0; /* not used */
549 	}
550 	bus->pcms_count = pcms_count;
551 	bus->pcms = rpcms;
552 	return 0;
553 }
554 
555 EXPORT_SYMBOL(snd_ac97_pcm_assign);
556 
557 /**
558  * snd_ac97_pcm_open - opens the given AC97 pcm
559  * @pcm: the ac97 pcm instance
560  * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
561  * @cfg: output stream characteristics
562  * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
563  *
564  * It locks the specified slots and sets the given rate to AC97 registers.
565  */
snd_ac97_pcm_open(struct ac97_pcm * pcm,unsigned int rate,enum ac97_pcm_cfg cfg,unsigned short slots)566 int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
567 		      enum ac97_pcm_cfg cfg, unsigned short slots)
568 {
569 	struct snd_ac97_bus *bus;
570 	int i, cidx, r, ok_flag;
571 	unsigned int reg_ok[4] = {0,0,0,0};
572 	unsigned char reg;
573 	int err = 0;
574 
575 	r = rate > 48000;
576 	bus = pcm->bus;
577 	if (cfg == AC97_PCM_CFG_SPDIF) {
578 		for (cidx = 0; cidx < 4; cidx++)
579 			if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
580 				err = set_spdif_rate(bus->codec[cidx], rate);
581 				if (err < 0)
582 					return err;
583 			}
584 	}
585 	spin_lock_irq(&pcm->bus->bus_lock);
586 	for (i = 3; i < 12; i++) {
587 		if (!(slots & (1 << i)))
588 			continue;
589 		ok_flag = 0;
590 		for (cidx = 0; cidx < 4; cidx++) {
591 			if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
592 				spin_unlock_irq(&pcm->bus->bus_lock);
593 				err = -EBUSY;
594 				goto error;
595 			}
596 			if (pcm->r[r].rslots[cidx] & (1 << i)) {
597 				bus->used_slots[pcm->stream][cidx] |= (1 << i);
598 				ok_flag++;
599 			}
600 		}
601 		if (!ok_flag) {
602 			spin_unlock_irq(&pcm->bus->bus_lock);
603 			snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
604 			err = -EAGAIN;
605 			goto error;
606 		}
607 	}
608 	pcm->cur_dbl = r;
609 	spin_unlock_irq(&pcm->bus->bus_lock);
610 	for (i = 3; i < 12; i++) {
611 		if (!(slots & (1 << i)))
612 			continue;
613 		for (cidx = 0; cidx < 4; cidx++) {
614 			if (pcm->r[r].rslots[cidx] & (1 << i)) {
615 				reg = get_slot_reg(pcm, cidx, i, r);
616 				if (reg == 0xff) {
617 					snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
618 					continue;
619 				}
620 				if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
621 					continue;
622 				//printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
623 				err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
624 				if (err < 0)
625 					snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
626 				else
627 					reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
628 			}
629 		}
630 	}
631 	pcm->aslots = slots;
632 	return 0;
633 
634  error:
635 	pcm->aslots = slots;
636 	snd_ac97_pcm_close(pcm);
637 	return err;
638 }
639 
640 EXPORT_SYMBOL(snd_ac97_pcm_open);
641 
642 /**
643  * snd_ac97_pcm_close - closes the given AC97 pcm
644  * @pcm: the ac97 pcm instance
645  *
646  * It frees the locked AC97 slots.
647  */
snd_ac97_pcm_close(struct ac97_pcm * pcm)648 int snd_ac97_pcm_close(struct ac97_pcm *pcm)
649 {
650 	struct snd_ac97_bus *bus;
651 	unsigned short slots = pcm->aslots;
652 	int i, cidx;
653 
654 #ifdef CONFIG_SND_AC97_POWER_SAVE
655 	int r = pcm->cur_dbl;
656 	for (i = 3; i < 12; i++) {
657 		if (!(slots & (1 << i)))
658 			continue;
659 		for (cidx = 0; cidx < 4; cidx++) {
660 			if (pcm->r[r].rslots[cidx] & (1 << i)) {
661 				int reg = get_slot_reg(pcm, cidx, i, r);
662 				snd_ac97_update_power(pcm->r[r].codec[cidx],
663 						      reg, 0);
664 			}
665 		}
666 	}
667 #endif
668 
669 	bus = pcm->bus;
670 	spin_lock_irq(&pcm->bus->bus_lock);
671 	for (i = 3; i < 12; i++) {
672 		if (!(slots & (1 << i)))
673 			continue;
674 		for (cidx = 0; cidx < 4; cidx++)
675 			bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
676 	}
677 	pcm->aslots = 0;
678 	pcm->cur_dbl = 0;
679 	spin_unlock_irq(&pcm->bus->bus_lock);
680 	return 0;
681 }
682 
683 EXPORT_SYMBOL(snd_ac97_pcm_close);
684 
double_rate_hw_constraint_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)685 static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
686 					  struct snd_pcm_hw_rule *rule)
687 {
688 	struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
689 	if (channels->min > 2) {
690 		static const struct snd_interval single_rates = {
691 			.min = 1,
692 			.max = 48000,
693 		};
694 		struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
695 		return snd_interval_refine(rate, &single_rates);
696 	}
697 	return 0;
698 }
699 
double_rate_hw_constraint_channels(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)700 static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
701 					      struct snd_pcm_hw_rule *rule)
702 {
703 	struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
704 	if (rate->min > 48000) {
705 		static const struct snd_interval double_rate_channels = {
706 			.min = 2,
707 			.max = 2,
708 		};
709 		struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
710 		return snd_interval_refine(channels, &double_rate_channels);
711 	}
712 	return 0;
713 }
714 
715 /**
716  * snd_ac97_pcm_double_rate_rules - set double rate constraints
717  * @runtime: the runtime of the ac97 front playback pcm
718  *
719  * Installs the hardware constraint rules to prevent using double rates and
720  * more than two channels at the same time.
721  */
snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime * runtime)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);
738