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linux-hardened/sound/pci/ac97/ac97_pcm.c
Paul Gortmaker d81a6d7176 sound: Add export.h for THIS_MODULE/EXPORT_SYMBOL where needed 
These aren't modules, but they do make use of these macros, so
they will need export.h to get that definition.  Previously,
they got it via the implicit module.h inclusion.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:22 -04:00

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/*
* Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include <sound/ac97_codec.h>
#include <sound/asoundef.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) {
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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