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kernel-fxtec-pro1x/sound/pci/ac97/ac97_pcm.c
Takashi Iwai 6dbe662874 [ALSA] Add experimental support of aggressive AC97 power-saving mode 
Added CONFIG_SND_AC97_POWER_SAVE kernel config to enable the support
of aggressive AC97 power-saving mode.  In this mode, the AC97
powerdown register bits are dynamically controlled at each open/close
of PCM streams.
The mode is activated via power_save option for snd-ac97-codec
driver.  As default it's off.  It can be turned on/off on the fly
via sysfs, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
2006-09-23 10:37:08 +02:00

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/*
* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
* Universal interface for Audio Codec '97
*
* For more details look to AC '97 component specification revision 2.2
* by Intel Corporation (http://developer.intel.com) and to datasheets
* for specific codecs.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sound/driver.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include <sound/ac97_codec.h>
#include <sound/asoundef.h>
#include "ac97_patch.h"
#include "ac97_id.h"
#include "ac97_local.h"
/*
* PCM support
*/
static unsigned char rate_reg_tables[2][4][9] = {
{
/* standard rates */
{
/* 3&4 front, 7&8 rear, 6&9 center/lfe */
AC97_PCM_FRONT_DAC_RATE, /* slot 3 */
AC97_PCM_FRONT_DAC_RATE, /* slot 4 */
0xff, /* slot 5 */
AC97_PCM_LFE_DAC_RATE, /* slot 6 */
AC97_PCM_SURR_DAC_RATE, /* slot 7 */
AC97_PCM_SURR_DAC_RATE, /* slot 8 */
AC97_PCM_LFE_DAC_RATE, /* slot 9 */
0xff, /* slot 10 */
0xff, /* slot 11 */
},
{
/* 7&8 front, 6&9 rear, 10&11 center/lfe */
0xff, /* slot 3 */
0xff, /* slot 4 */
0xff, /* slot 5 */
AC97_PCM_SURR_DAC_RATE, /* slot 6 */
AC97_PCM_FRONT_DAC_RATE, /* slot 7 */
AC97_PCM_FRONT_DAC_RATE, /* slot 8 */
AC97_PCM_SURR_DAC_RATE, /* slot 9 */
AC97_PCM_LFE_DAC_RATE, /* slot 10 */
AC97_PCM_LFE_DAC_RATE, /* slot 11 */
},
{
/* 6&9 front, 10&11 rear, 3&4 center/lfe */
AC97_PCM_LFE_DAC_RATE, /* slot 3 */
AC97_PCM_LFE_DAC_RATE, /* slot 4 */
0xff, /* slot 5 */
AC97_PCM_FRONT_DAC_RATE, /* slot 6 */
0xff, /* slot 7 */
0xff, /* slot 8 */
AC97_PCM_FRONT_DAC_RATE, /* slot 9 */
AC97_PCM_SURR_DAC_RATE, /* slot 10 */
AC97_PCM_SURR_DAC_RATE, /* slot 11 */
},
{
/* 10&11 front, 3&4 rear, 7&8 center/lfe */
AC97_PCM_SURR_DAC_RATE, /* slot 3 */
AC97_PCM_SURR_DAC_RATE, /* slot 4 */
0xff, /* slot 5 */
0xff, /* slot 6 */
AC97_PCM_LFE_DAC_RATE, /* slot 7 */
AC97_PCM_LFE_DAC_RATE, /* slot 8 */
0xff, /* slot 9 */
AC97_PCM_FRONT_DAC_RATE, /* slot 10 */
AC97_PCM_FRONT_DAC_RATE, /* slot 11 */
},
},
{
/* double rates */
{
/* 3&4 front, 7&8 front (t+1) */
AC97_PCM_FRONT_DAC_RATE, /* slot 3 */
AC97_PCM_FRONT_DAC_RATE, /* slot 4 */
0xff, /* slot 5 */
0xff, /* slot 6 */
AC97_PCM_FRONT_DAC_RATE, /* slot 7 */
AC97_PCM_FRONT_DAC_RATE, /* slot 8 */
0xff, /* slot 9 */
0xff, /* slot 10 */
0xff, /* slot 11 */
},
{
/* not specified in the specification */
0xff, /* slot 3 */
0xff, /* slot 4 */
0xff, /* slot 5 */
0xff, /* slot 6 */
0xff, /* slot 7 */
0xff, /* slot 8 */
0xff, /* slot 9 */
0xff, /* slot 10 */
0xff, /* slot 11 */
},
{
0xff, /* slot 3 */
0xff, /* slot 4 */
0xff, /* slot 5 */
0xff, /* slot 6 */
0xff, /* slot 7 */
0xff, /* slot 8 */
0xff, /* slot 9 */
0xff, /* slot 10 */
0xff, /* slot 11 */
},
{
0xff, /* slot 3 */
0xff, /* slot 4 */
0xff, /* slot 5 */
0xff, /* slot 6 */
0xff, /* slot 7 */
0xff, /* slot 8 */
0xff, /* slot 9 */
0xff, /* slot 10 */
0xff, /* slot 11 */
}
}};
/* FIXME: more various mappings for ADC? */
static unsigned char rate_cregs[9] = {
AC97_PCM_LR_ADC_RATE, /* 3 */
AC97_PCM_LR_ADC_RATE, /* 4 */
0xff, /* 5 */
AC97_PCM_MIC_ADC_RATE, /* 6 */
0xff, /* 7 */
0xff, /* 8 */
0xff, /* 9 */
0xff, /* 10 */
0xff, /* 11 */
};
static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx,
unsigned short slot, int dbl)
{
if (slot < 3)
return 0xff;
if (slot > 11)
return 0xff;
if (pcm->spdif)
return AC97_SPDIF; /* pseudo register */
if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK)
return rate_reg_tables[dbl][pcm->r[dbl].rate_table[cidx]][slot - 3];
else
return rate_cregs[slot - 3];
}
static int set_spdif_rate(struct snd_ac97 *ac97, unsigned short rate)
{
unsigned short old, bits, reg, mask;
unsigned int sbits;
if (! (ac97->ext_id & AC97_EI_SPDIF))
return -ENODEV;
/* TODO: double rate support */
if (ac97->flags & AC97_CS_SPDIF) {
switch (rate) {
case 48000: bits = 0; break;
case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
default: /* invalid - disable output */
snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
return -EINVAL;
}
reg = AC97_CSR_SPDIF;
mask = 1 << AC97_SC_SPSR_SHIFT;
} else {
if (ac97->id == AC97_ID_CM9739 && rate != 48000) {
snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
return -EINVAL;
}
switch (rate) {
case 44100: bits = AC97_SC_SPSR_44K; break;
case 48000: bits = AC97_SC_SPSR_48K; break;
case 32000: bits = AC97_SC_SPSR_32K; break;
default: /* invalid - disable output */
snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
return -EINVAL;
}
reg = AC97_SPDIF;
mask = AC97_SC_SPSR_MASK;
}
mutex_lock(&ac97->reg_mutex);
old = snd_ac97_read(ac97, reg) & mask;
if (old != bits) {
snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
snd_ac97_update_bits_nolock(ac97, reg, mask, bits);
/* update the internal spdif bits */
sbits = ac97->spdif_status;
if (sbits & IEC958_AES0_PROFESSIONAL) {
sbits &= ~IEC958_AES0_PRO_FS;
switch (rate) {
case 44100: sbits |= IEC958_AES0_PRO_FS_44100; break;
case 48000: sbits |= IEC958_AES0_PRO_FS_48000; break;
case 32000: sbits |= IEC958_AES0_PRO_FS_32000; break;
}
} else {
sbits &= ~(IEC958_AES3_CON_FS << 24);
switch (rate) {
case 44100: sbits |= IEC958_AES3_CON_FS_44100<<24; break;
case 48000: sbits |= IEC958_AES3_CON_FS_48000<<24; break;
case 32000: sbits |= IEC958_AES3_CON_FS_32000<<24; break;
}
}
ac97->spdif_status = sbits;
}
snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, AC97_EA_SPDIF);
mutex_unlock(&ac97->reg_mutex);
return 0;
}
/**
* snd_ac97_set_rate - change the rate of the given input/output.
* @ac97: the ac97 instance
* @reg: the register to change
* @rate: the sample rate to set
*
* Changes the rate of the given input/output on the codec.
* If the codec doesn't support VAR, the rate must be 48000 (except
* for SPDIF).
*
* The valid registers are AC97_PMC_MIC_ADC_RATE,
* AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
* AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
* if the codec supports them.
* AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
* status bits.
*
* Returns zero if successful, or a negative error code on failure.
*/
int snd_ac97_set_rate(struct snd_ac97 *ac97, int reg, unsigned int rate)
{
int dbl;
unsigned int tmp;
dbl = rate > 48000;
if (dbl) {
if (!(ac97->flags & AC97_DOUBLE_RATE))
return -EINVAL;
if (reg != AC97_PCM_FRONT_DAC_RATE)
return -EINVAL;
}
snd_ac97_update_power(ac97, reg, 1);
switch (reg) {
case AC97_PCM_MIC_ADC_RATE:
if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0) /* MIC VRA */
if (rate != 48000)
return -EINVAL;
break;
case AC97_PCM_FRONT_DAC_RATE:
case AC97_PCM_LR_ADC_RATE:
if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0) /* VRA */
if (rate != 48000 && rate != 96000)
return -EINVAL;
break;
case AC97_PCM_SURR_DAC_RATE:
if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
return -EINVAL;
break;
case AC97_PCM_LFE_DAC_RATE:
if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
return -EINVAL;
break;
case AC97_SPDIF:
/* special case */
return set_spdif_rate(ac97, rate);
default:
return -EINVAL;
}
if (dbl)
rate /= 2;
tmp = (rate * ac97->bus->clock) / 48000;
if (tmp > 65535)
return -EINVAL;
if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
snd_ac97_update(ac97, reg, tmp & 0xffff);
snd_ac97_read(ac97, reg);
if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
/* Intel controllers require double rate data to be put in
* slots 7+8
*/
snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
AC97_GP_DRSS_MASK,
dbl ? AC97_GP_DRSS_78 : 0);
snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
}
return 0;
}
EXPORT_SYMBOL(snd_ac97_set_rate);
static unsigned short get_pslots(struct snd_ac97 *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
{
if (!ac97_is_audio(ac97))
return 0;
if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
unsigned short slots = 0;
if (ac97_is_rev22(ac97)) {
/* Note: it's simply emulation of AMAP behaviour */
u16 es;
es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
switch (ac97->addr) {
case 1:
case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
}
snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
}
switch (ac97->addr) {
case 0:
slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
if (ac97->ext_id & AC97_EI_SPDIF) {
if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
else
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
}
*rate_table = 0;
break;
case 1:
case 2:
slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
if (ac97->ext_id & AC97_EI_SPDIF) {
if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
else
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
}
*rate_table = 1;
break;
case 3:
slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
if (ac97->ext_id & AC97_EI_SPDIF)
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
*rate_table = 2;
break;
}
return slots;
} else {
unsigned short slots;
slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
if (ac97->ext_id & AC97_EI_SPDIF) {
if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
else
*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
}
*rate_table = 0;
return slots;
}
}
static unsigned short get_cslots(struct snd_ac97 *ac97)
{
unsigned short slots;
if (!ac97_is_audio(ac97))
return 0;
slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
slots |= (1<<AC97_SLOT_MIC);
return slots;
}
static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
{
int i, idx;
unsigned int rates = ~0;
unsigned char reg;
for (i = 3; i < 12; i++) {
if (!(slots & (1 << i)))
continue;
reg = get_slot_reg(pcm, cidx, i, dbl);
switch (reg) {
case AC97_PCM_FRONT_DAC_RATE: idx = AC97_RATES_FRONT_DAC; break;
case AC97_PCM_SURR_DAC_RATE: idx = AC97_RATES_SURR_DAC; break;
case AC97_PCM_LFE_DAC_RATE: idx = AC97_RATES_LFE_DAC; break;
case AC97_PCM_LR_ADC_RATE: idx = AC97_RATES_ADC; break;
case AC97_PCM_MIC_ADC_RATE: idx = AC97_RATES_MIC_ADC; break;
default: idx = AC97_RATES_SPDIF; break;
}
rates &= pcm->r[dbl].codec[cidx]->rates[idx];
}
if (!dbl)
rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
SNDRV_PCM_RATE_96000);
return rates;
}
/**
* snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
* @bus: the ac97 bus instance
* @pcms_count: count of PCMs to be assigned
* @pcms: PCMs to be assigned
*
* It assigns available AC97 slots for given PCMs. If none or only
* some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
* are reduced and might be zero.
*/
int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
unsigned short pcms_count,
const struct ac97_pcm *pcms)
{
int i, j, k;
const struct ac97_pcm *pcm;
struct ac97_pcm *rpcms, *rpcm;
unsigned short avail_slots[2][4];
unsigned char rate_table[2][4];
unsigned short tmp, slots;
unsigned short spdif_slots[4];
unsigned int rates;
struct snd_ac97 *codec;
rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
if (rpcms == NULL)
return -ENOMEM;
memset(avail_slots, 0, sizeof(avail_slots));
memset(rate_table, 0, sizeof(rate_table));
memset(spdif_slots, 0, sizeof(spdif_slots));
for (i = 0; i < 4; i++) {
codec = bus->codec[i];
if (!codec)
continue;
avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
avail_slots[1][i] = get_cslots(codec);
if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
for (j = 0; j < i; j++) {
if (bus->codec[j])
avail_slots[1][i] &= ~avail_slots[1][j];
}
}
}
/* first step - exclusive devices */
for (i = 0; i < pcms_count; i++) {
pcm = &pcms[i];
rpcm = &rpcms[i];
/* low-level driver thinks that it's more clever */
if (pcm->copy_flag) {
*rpcm = *pcm;
continue;
}
rpcm->stream = pcm->stream;
rpcm->exclusive = pcm->exclusive;
rpcm->spdif = pcm->spdif;
rpcm->private_value = pcm->private_value;
rpcm->bus = bus;
rpcm->rates = ~0;
slots = pcm->r[0].slots;
for (j = 0; j < 4 && slots; j++) {
if (!bus->codec[j])
continue;
rates = ~0;
if (pcm->spdif && pcm->stream == 0)
tmp = spdif_slots[j];
else
tmp = avail_slots[pcm->stream][j];
if (pcm->exclusive) {
/* exclusive access */
tmp &= slots;
for (k = 0; k < i; k++) {
if (rpcm->stream == rpcms[k].stream)
tmp &= ~rpcms[k].r[0].rslots[j];
}
} else {
/* non-exclusive access */
tmp &= pcm->r[0].slots;
}
if (tmp) {
rpcm->r[0].rslots[j] = tmp;
rpcm->r[0].codec[j] = bus->codec[j];
rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
if (bus->no_vra)
rates = SNDRV_PCM_RATE_48000;
else
rates = get_rates(rpcm, j, tmp, 0);
if (pcm->exclusive)
avail_slots[pcm->stream][j] &= ~tmp;
}
slots &= ~tmp;
rpcm->r[0].slots |= tmp;
rpcm->rates &= rates;
}
/* for double rate, we check the first codec only */
if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
rate_table[pcm->stream][0] == 0) {
tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
(1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
if ((tmp & pcm->r[1].slots) == tmp) {
rpcm->r[1].slots = tmp;
rpcm->r[1].rslots[0] = tmp;
rpcm->r[1].rate_table[0] = 0;
rpcm->r[1].codec[0] = bus->codec[0];
if (pcm->exclusive)
avail_slots[pcm->stream][0] &= ~tmp;
if (bus->no_vra)
rates = SNDRV_PCM_RATE_96000;
else
rates = get_rates(rpcm, 0, tmp, 1);
rpcm->rates |= rates;
}
}
if (rpcm->rates == ~0)
rpcm->rates = 0; /* not used */
}
bus->pcms_count = pcms_count;
bus->pcms = rpcms;
return 0;
}
EXPORT_SYMBOL(snd_ac97_pcm_assign);
/**
* snd_ac97_pcm_open - opens the given AC97 pcm
* @pcm: the ac97 pcm instance
* @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
* @cfg: output stream characteristics
* @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
*
* It locks the specified slots and sets the given rate to AC97 registers.
*/
int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
enum ac97_pcm_cfg cfg, unsigned short slots)
{
struct snd_ac97_bus *bus;
int i, cidx, r, ok_flag;
unsigned int reg_ok[4] = {0,0,0,0};
unsigned char reg;
int err = 0;
r = rate > 48000;
bus = pcm->bus;
if (cfg == AC97_PCM_CFG_SPDIF) {
int err;
for (cidx = 0; cidx < 4; cidx++)
if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
err = set_spdif_rate(bus->codec[cidx], rate);
if (err < 0)
return err;
}
}
spin_lock_irq(&pcm->bus->bus_lock);
for (i = 3; i < 12; i++) {
if (!(slots & (1 << i)))
continue;
ok_flag = 0;
for (cidx = 0; cidx < 4; cidx++) {
if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
spin_unlock_irq(&pcm->bus->bus_lock);
err = -EBUSY;
goto error;
}
if (pcm->r[r].rslots[cidx] & (1 << i)) {
bus->used_slots[pcm->stream][cidx] |= (1 << i);
ok_flag++;
}
}
if (!ok_flag) {
spin_unlock_irq(&pcm->bus->bus_lock);
snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
err = -EAGAIN;
goto error;
}
}
pcm->cur_dbl = r;
spin_unlock_irq(&pcm->bus->bus_lock);
for (i = 3; i < 12; i++) {
if (!(slots & (1 << i)))
continue;
for (cidx = 0; cidx < 4; cidx++) {
if (pcm->r[r].rslots[cidx] & (1 << i)) {
reg = get_slot_reg(pcm, cidx, i, r);
if (reg == 0xff) {
snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
continue;
}
if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
continue;
//printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
if (err < 0)
snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
else
reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
}
}
}
pcm->aslots = slots;
return 0;
error:
pcm->aslots = slots;
snd_ac97_pcm_close(pcm);
return err;
}
EXPORT_SYMBOL(snd_ac97_pcm_open);
/**
* snd_ac97_pcm_close - closes the given AC97 pcm
* @pcm: the ac97 pcm instance
*
* It frees the locked AC97 slots.
*/
int snd_ac97_pcm_close(struct ac97_pcm *pcm)
{
struct snd_ac97_bus *bus;
unsigned short slots = pcm->aslots;
int i, cidx;
#ifdef CONFIG_SND_AC97_POWER_SAVE
int r = pcm->cur_dbl;
for (i = 3; i < 12; i++) {
if (!(slots & (1 << i)))
continue;
for (cidx = 0; cidx < 4; cidx++) {
if (pcm->r[r].rslots[cidx] & (1 << i)) {
int reg = get_slot_reg(pcm, cidx, i, r);
snd_ac97_update_power(pcm->r[r].codec[cidx],
reg, 0);
}
}
}
#endif
bus = pcm->bus;
spin_lock_irq(&pcm->bus->bus_lock);
for (i = 3; i < 12; i++) {
if (!(slots & (1 << i)))
continue;
for (cidx = 0; cidx < 4; cidx++)
bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
}
pcm->aslots = 0;
pcm->cur_dbl = 0;
spin_unlock_irq(&pcm->bus->bus_lock);
return 0;
}
EXPORT_SYMBOL(snd_ac97_pcm_close);
static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
if (channels->min > 2) {
static const struct snd_interval single_rates = {
.min = 1,
.max = 48000,
};
struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
return snd_interval_refine(rate, &single_rates);
}
return 0;
}
static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
if (rate->min > 48000) {
static const struct snd_interval double_rate_channels = {
.min = 2,
.max = 2,
};
struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
return snd_interval_refine(channels, &double_rate_channels);
}
return 0;
}
/**
* snd_ac97_pcm_double_rate_rules - set double rate constraints
* @runtime: the runtime of the ac97 front playback pcm
*
* Installs the hardware constraint rules to prevent using double rates and
* more than two channels at the same time.
*/
int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
{
int err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
double_rate_hw_constraint_rate, NULL,
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
double_rate_hw_constraint_channels, NULL,
SNDRV_PCM_HW_PARAM_RATE, -1);
return err;
}
EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);
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