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
 29static 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? */
132static 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
144static 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
159static 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	guard(mutex)(&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	return 0;
221}
222
223/**
224 * snd_ac97_set_rate - change the rate of the given input/output.
225 * @ac97: the ac97 instance
226 * @reg: the register to change
227 * @rate: the sample rate to set
228 *
229 * Changes the rate of the given input/output on the codec.
230 * If the codec doesn't support VAR, the rate must be 48000 (except
231 * for SPDIF).
232 *
233 * The valid registers are AC97_PCM_MIC_ADC_RATE,
234 * AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
235 * AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
236 * if the codec supports them.
237 * AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
238 * status bits.
239 *
240 * Return: Zero if successful, or a negative error code on failure.
241 */
242int snd_ac97_set_rate(struct snd_ac97 *ac97, int reg, unsigned int rate)
243{
244	int dbl;
245	unsigned int tmp;
246	
247	dbl = rate > 48000;
248	if (dbl) {
249		if (!(ac97->flags & AC97_DOUBLE_RATE))
250			return -EINVAL;
251		if (reg != AC97_PCM_FRONT_DAC_RATE)
252			return -EINVAL;
253	}
254
255	snd_ac97_update_power(ac97, reg, 1);
256	switch (reg) {
257	case AC97_PCM_MIC_ADC_RATE:
258		if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)	/* MIC VRA */
259			if (rate != 48000)
260				return -EINVAL;
261		break;
262	case AC97_PCM_FRONT_DAC_RATE:
263	case AC97_PCM_LR_ADC_RATE:
264		if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)	/* VRA */
265			if (rate != 48000 && rate != 96000)
266				return -EINVAL;
267		break;
268	case AC97_PCM_SURR_DAC_RATE:
269		if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
270			return -EINVAL;
271		break;
272	case AC97_PCM_LFE_DAC_RATE:
273		if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
274			return -EINVAL;
275		break;
276	case AC97_SPDIF:
277		/* special case */
278		return set_spdif_rate(ac97, rate);
279	default:
280		return -EINVAL;
281	}
282	if (dbl)
283		rate /= 2;
284	tmp = (rate * ac97->bus->clock) / 48000;
285	if (tmp > 65535)
286		return -EINVAL;
287	if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
288		snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
289				     AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
290	snd_ac97_update(ac97, reg, tmp & 0xffff);
291	snd_ac97_read(ac97, reg);
292	if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
293		/* Intel controllers require double rate data to be put in
294		 * slots 7+8
295		 */
296		snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
297				     AC97_GP_DRSS_MASK,
298				     dbl ? AC97_GP_DRSS_78 : 0);
299		snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
300	}
301	return 0;
302}
303
304EXPORT_SYMBOL(snd_ac97_set_rate);
305
306static unsigned short get_pslots(struct snd_ac97 *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
307{
308	if (!ac97_is_audio(ac97))
309		return 0;
310	if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
311		unsigned short slots = 0;
312		if (ac97_is_rev22(ac97)) {
313			/* Note: it's simply emulation of AMAP behaviour */
314			u16 es;
315			es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
316			switch (ac97->addr) {
317			case 1:
318			case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
319			case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
320			}
321			snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
322		}
323		switch (ac97->addr) {
324		case 0:
325			slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
326			if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
327				slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
328			if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
329				slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
330			if (ac97->ext_id & AC97_EI_SPDIF) {
331				if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
332					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
333				else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
334					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
335				else
336					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
337			}
338			*rate_table = 0;
339			break;
340		case 1:
341		case 2:
342			slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
343			if (ac97->scaps & AC97_SCAP_SURROUND_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_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
348				else
349					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
350			}
351			*rate_table = 1;
352			break;
353		case 3:
354			slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
355			if (ac97->ext_id & AC97_EI_SPDIF)
356				*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
357			*rate_table = 2;
358			break;
359		}
360		return slots;
361	} else {
362		unsigned short slots;
363		slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
364		if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
365			slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
366		if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
367			slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
368		if (ac97->ext_id & AC97_EI_SPDIF) {
369			if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
370				*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
371			else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
372				*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
373			else
374				*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
375		}
376		*rate_table = 0;
377		return slots;
378	}
379}
380
381static unsigned short get_cslots(struct snd_ac97 *ac97)
382{
383	unsigned short slots;
384
385	if (!ac97_is_audio(ac97))
386		return 0;
387	slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
388	slots |= (1<<AC97_SLOT_MIC);
389	return slots;
390}
391
392static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
393{
394	int i, idx;
395	unsigned int rates = ~0;
396	unsigned char reg;
397
398	for (i = 3; i < 12; i++) {
399		if (!(slots & (1 << i)))
400			continue;
401		reg = get_slot_reg(pcm, cidx, i, dbl);
402		switch (reg) {
403		case AC97_PCM_FRONT_DAC_RATE:	idx = AC97_RATES_FRONT_DAC; break;
404		case AC97_PCM_SURR_DAC_RATE:	idx = AC97_RATES_SURR_DAC; break;
405		case AC97_PCM_LFE_DAC_RATE:	idx = AC97_RATES_LFE_DAC; break;
406		case AC97_PCM_LR_ADC_RATE:	idx = AC97_RATES_ADC; break;
407		case AC97_PCM_MIC_ADC_RATE:	idx = AC97_RATES_MIC_ADC; break;
408		default:			idx = AC97_RATES_SPDIF; break;
409		}
410		rates &= pcm->r[dbl].codec[cidx]->rates[idx];
411	}
412	if (!dbl)
413		rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
414			   SNDRV_PCM_RATE_96000);
415	return rates;
416}
417
418/**
419 * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
420 * @bus: the ac97 bus instance
421 * @pcms_count: count of PCMs to be assigned
422 * @pcms: PCMs to be assigned
423 *
424 * It assigns available AC97 slots for given PCMs. If none or only
425 * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
426 * are reduced and might be zero.
427 *
428 * Return: Zero if successful, or a negative error code on failure.
429 */
430int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
431			unsigned short pcms_count,
432			const struct ac97_pcm *pcms)
433{
434	int i, j, k;
435	const struct ac97_pcm *pcm;
436	struct ac97_pcm *rpcms, *rpcm;
437	unsigned short avail_slots[2][4];
438	unsigned char rate_table[2][4];
439	unsigned short tmp, slots;
440	unsigned short spdif_slots[4];
441	unsigned int rates;
442	struct snd_ac97 *codec;
443
444	rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
445	if (rpcms == NULL)
446		return -ENOMEM;
447	memset(avail_slots, 0, sizeof(avail_slots));
448	memset(rate_table, 0, sizeof(rate_table));
449	memset(spdif_slots, 0, sizeof(spdif_slots));
450	for (i = 0; i < 4; i++) {
451		codec = bus->codec[i];
452		if (!codec)
453			continue;
454		avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
455		avail_slots[1][i] = get_cslots(codec);
456		if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
457			for (j = 0; j < i; j++) {
458				if (bus->codec[j])
459					avail_slots[1][i] &= ~avail_slots[1][j];
460			}
461		}
462	}
463	/* first step - exclusive devices */
464	for (i = 0; i < pcms_count; i++) {
465		pcm = &pcms[i];
466		rpcm = &rpcms[i];
467		/* low-level driver thinks that it's more clever */
468		if (pcm->copy_flag) {
469			*rpcm = *pcm;
470			continue;
471		}
472		rpcm->stream = pcm->stream;
473		rpcm->exclusive = pcm->exclusive;
474		rpcm->spdif = pcm->spdif;
475		rpcm->private_value = pcm->private_value;
476		rpcm->bus = bus;
477		rpcm->rates = ~0;
478		slots = pcm->r[0].slots;
479		for (j = 0; j < 4 && slots; j++) {
480			if (!bus->codec[j])
481				continue;
482			rates = ~0;
483			if (pcm->spdif && pcm->stream == 0)
484				tmp = spdif_slots[j];
485			else
486				tmp = avail_slots[pcm->stream][j];
487			if (pcm->exclusive) {
488				/* exclusive access */
489				tmp &= slots;
490				for (k = 0; k < i; k++) {
491					if (rpcm->stream == rpcms[k].stream)
492						tmp &= ~rpcms[k].r[0].rslots[j];
493				}
494			} else {
495				/* non-exclusive access */
496				tmp &= pcm->r[0].slots;
497			}
498			if (tmp) {
499				rpcm->r[0].rslots[j] = tmp;
500				rpcm->r[0].codec[j] = bus->codec[j];
501				rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
502				if (bus->no_vra)
503					rates = SNDRV_PCM_RATE_48000;
504				else
505					rates = get_rates(rpcm, j, tmp, 0);
506				if (pcm->exclusive)
507					avail_slots[pcm->stream][j] &= ~tmp;
508			}
509			slots &= ~tmp;
510			rpcm->r[0].slots |= tmp;
511			rpcm->rates &= rates;
512		}
513		/* for double rate, we check the first codec only */
514		if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
515		    bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
516		    rate_table[pcm->stream][0] == 0) {
517			tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
518			      (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
519			if ((tmp & pcm->r[1].slots) == tmp) {
520				rpcm->r[1].slots = tmp;
521				rpcm->r[1].rslots[0] = tmp;
522				rpcm->r[1].rate_table[0] = 0;
523				rpcm->r[1].codec[0] = bus->codec[0];
524				if (pcm->exclusive)
525					avail_slots[pcm->stream][0] &= ~tmp;
526				if (bus->no_vra)
527					rates = SNDRV_PCM_RATE_96000;
528				else
529					rates = get_rates(rpcm, 0, tmp, 1);
530				rpcm->rates |= rates;
531			}
532		}
533		if (rpcm->rates == ~0)
534			rpcm->rates = 0; /* not used */
535	}
536	bus->pcms_count = pcms_count;
537	bus->pcms = rpcms;
538	return 0;
539}
540
541EXPORT_SYMBOL(snd_ac97_pcm_assign);
542
543/**
544 * snd_ac97_pcm_open - opens the given AC97 pcm
545 * @pcm: the ac97 pcm instance
546 * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
547 * @cfg: output stream characteristics
548 * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
549 *
550 * It locks the specified slots and sets the given rate to AC97 registers.
551 *
552 * Return: Zero if successful, or a negative error code on failure.
553 */
554int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
555		      enum ac97_pcm_cfg cfg, unsigned short slots)
556{
557	struct snd_ac97_bus *bus;
558	int i, cidx, r, ok_flag;
559	unsigned int reg_ok[4] = {0,0,0,0};
560	unsigned char reg;
561	int err = 0;
562
563	r = rate > 48000;
564	bus = pcm->bus;
565	if (cfg == AC97_PCM_CFG_SPDIF) {
566		for (cidx = 0; cidx < 4; cidx++)
567			if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
568				err = set_spdif_rate(bus->codec[cidx], rate);
569				if (err < 0)
570					return err;
571			}
572	}
573	scoped_guard(spinlock_irq, &pcm->bus->bus_lock) {
574		for (i = 3; i < 12; i++) {
575			if (!(slots & (1 << i)))
576				continue;
577			ok_flag = 0;
578			for (cidx = 0; cidx < 4; cidx++) {
579				if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
580					err = -EBUSY;
581					goto error;
582				}
583				if (pcm->r[r].rslots[cidx] & (1 << i)) {
584					bus->used_slots[pcm->stream][cidx] |= (1 << i);
585					ok_flag++;
586				}
587			}
588			if (!ok_flag) {
589				dev_err(bus->card->dev,
590					"cannot find configuration for AC97 slot %i\n",
591					i);
592				err = -EAGAIN;
593				goto error;
594			}
595		}
596		pcm->cur_dbl = r;
597	}
598	for (i = 3; i < 12; i++) {
599		if (!(slots & (1 << i)))
600			continue;
601		for (cidx = 0; cidx < 4; cidx++) {
602			if (pcm->r[r].rslots[cidx] & (1 << i)) {
603				reg = get_slot_reg(pcm, cidx, i, r);
604				if (reg == 0xff) {
605					dev_err(bus->card->dev,
606						"invalid AC97 slot %i?\n", i);
607					continue;
608				}
609				if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
610					continue;
611				dev_dbg(bus->card->dev,
612					"setting ac97 reg 0x%x to rate %d\n",
613					reg, rate);
614				err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
615				if (err < 0)
616					dev_err(bus->card->dev,
617						"error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n",
618						cidx, reg, rate, err);
619				else
620					reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
621			}
622		}
623	}
624	pcm->aslots = slots;
625	return 0;
626
627 error:
628	pcm->aslots = slots;
629	snd_ac97_pcm_close(pcm);
630	return err;
631}
632
633EXPORT_SYMBOL(snd_ac97_pcm_open);
634
635/**
636 * snd_ac97_pcm_close - closes the given AC97 pcm
637 * @pcm: the ac97 pcm instance
638 *
639 * It frees the locked AC97 slots.
640 *
641 * Return: Zero.
642 */
643int snd_ac97_pcm_close(struct ac97_pcm *pcm)
644{
645	struct snd_ac97_bus *bus;
646	unsigned short slots = pcm->aslots;
647	int i, cidx;
648
649#ifdef CONFIG_SND_AC97_POWER_SAVE
650	int r = pcm->cur_dbl;
651	for (i = 3; i < 12; i++) {
652		if (!(slots & (1 << i)))
653			continue;
654		for (cidx = 0; cidx < 4; cidx++) {
655			if (pcm->r[r].rslots[cidx] & (1 << i)) {
656				int reg = get_slot_reg(pcm, cidx, i, r);
657				snd_ac97_update_power(pcm->r[r].codec[cidx],
658						      reg, 0);
659			}
660		}
661	}
662#endif
663
664	bus = pcm->bus;
665	guard(spinlock_irq)(&pcm->bus->bus_lock);
666	for (i = 3; i < 12; i++) {
667		if (!(slots & (1 << i)))
668			continue;
669		for (cidx = 0; cidx < 4; cidx++)
670			bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
671	}
672	pcm->aslots = 0;
673	pcm->cur_dbl = 0;
674	return 0;
675}
676
677EXPORT_SYMBOL(snd_ac97_pcm_close);
678
679static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
680					  struct snd_pcm_hw_rule *rule)
681{
682	struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
683	if (channels->min > 2) {
684		static const struct snd_interval single_rates = {
685			.min = 1,
686			.max = 48000,
687		};
688		struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
689		return snd_interval_refine(rate, &single_rates);
690	}
691	return 0;
692}
693
694static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
695					      struct snd_pcm_hw_rule *rule)
696{
697	struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
698	if (rate->min > 48000) {
699		static const struct snd_interval double_rate_channels = {
700			.min = 2,
701			.max = 2,
702		};
703		struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
704		return snd_interval_refine(channels, &double_rate_channels);
705	}
706	return 0;
707}
708
709/**
710 * snd_ac97_pcm_double_rate_rules - set double rate constraints
711 * @runtime: the runtime of the ac97 front playback pcm
712 *
713 * Installs the hardware constraint rules to prevent using double rates and
714 * more than two channels at the same time.
715 *
716 * Return: Zero if successful, or a negative error code on failure.
717 */
718int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
719{
720	int err;
721
722	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
723				  double_rate_hw_constraint_rate, NULL,
724				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
725	if (err < 0)
726		return err;
727	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
728				  double_rate_hw_constraint_channels, NULL,
729				  SNDRV_PCM_HW_PARAM_RATE, -1);
730	return err;
731}
732
733EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);