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 
get_slot_reg(struct ac97_pcm * pcm,unsigned short cidx,unsigned short slot,int dbl)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 
set_spdif_rate(struct snd_ac97 * ac97,unsigned short rate)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  */
snd_ac97_set_rate(struct snd_ac97 * ac97,int reg,unsigned int rate)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 
get_pslots(struct snd_ac97 * ac97,unsigned char * rate_table,unsigned short * spdif_slots)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 
get_cslots(struct snd_ac97 * ac97)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 
get_rates(struct ac97_pcm * pcm,unsigned int cidx,unsigned short slots,int dbl)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  */
snd_ac97_pcm_assign(struct snd_ac97_bus * bus,unsigned short pcms_count,const struct ac97_pcm * pcms)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  */
snd_ac97_pcm_open(struct ac97_pcm * pcm,unsigned int rate,enum ac97_pcm_cfg cfg,unsigned short slots)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  */
snd_ac97_pcm_close(struct ac97_pcm * pcm)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 
double_rate_hw_constraint_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)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 
double_rate_hw_constraint_channels(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)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  */
snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime * runtime)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);
737