- 根目录:
- sound
- pci
- cs5535audio
- cs5535audio_pcm.c
/*
* Driver for audio on multifunction CS5535 companion device
* Copyright (C) Jaya Kumar
*
* Based on Jaroslav Kysela and Takashi Iwai's examples.
* This work was sponsored by CIS(M) Sdn Bhd.
*
* 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
*
* todo: add be fmt support, spdif, pm
*/
#include <linux/init.h>
#include <linux/pci.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/asoundef.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/ac97_codec.h>
#include "cs5535audio.h"
static struct snd_pcm_hardware snd_cs5535audio_playback =
{
.info = (
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME
),
.formats = (
SNDRV_PCM_FMTBIT_S16_LE
),
.rates = (
SNDRV_PCM_RATE_CONTINUOUS |
SNDRV_PCM_RATE_8000_48000
),
.rate_min = 4000,
.rate_max = 48000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = (128*1024),
.period_bytes_min = 64,
.period_bytes_max = (64*1024 - 16),
.periods_min = 1,
.periods_max = CS5535AUDIO_MAX_DESCRIPTORS,
.fifo_size = 0,
};
static struct snd_pcm_hardware snd_cs5535audio_capture =
{
.info = (
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID
),
.formats = (
SNDRV_PCM_FMTBIT_S16_LE
),
.rates = (
SNDRV_PCM_RATE_CONTINUOUS |
SNDRV_PCM_RATE_8000_48000
),
.rate_min = 4000,
.rate_max = 48000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = (128*1024),
.period_bytes_min = 64,
.period_bytes_max = (64*1024 - 16),
.periods_min = 1,
.periods_max = CS5535AUDIO_MAX_DESCRIPTORS,
.fifo_size = 0,
};
static int snd_cs5535audio_playback_open(struct snd_pcm_substream *substream)
{
int err;
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->hw = snd_cs5535audio_playback;
runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_FRONT_DAC];
snd_pcm_limit_hw_rates(runtime);
cs5535au->playback_substream = substream;
runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK]);
if ((err = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
return err;
return 0;
}
static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream)
{
return 0;
}
#define CS5535AUDIO_DESC_LIST_SIZE \
PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc))
static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
struct cs5535audio_dma *dma,
struct snd_pcm_substream *substream,
unsigned int periods,
unsigned int period_bytes)
{
unsigned int i;
u32 addr, desc_addr, jmpprd_addr;
struct cs5535audio_dma_desc *lastdesc;
if (periods > CS5535AUDIO_MAX_DESCRIPTORS)
return -ENOMEM;
if (dma->desc_buf.area == NULL) {
if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(cs5535au->pci),
CS5535AUDIO_DESC_LIST_SIZE+1,
&dma->desc_buf) < 0)
return -ENOMEM;
dma->period_bytes = dma->periods = 0;
}
if (dma->periods == periods && dma->period_bytes == period_bytes)
return 0;
/* the u32 cast is okay because in snd*create we successfully told
pci alloc that we're only 32 bit capable so the uppper will be 0 */
addr = (u32) substream->runtime->dma_addr;
desc_addr = (u32) dma->desc_buf.addr;
for (i = 0; i < periods; i++) {
struct cs5535audio_dma_desc *desc =
&((struct cs5535audio_dma_desc *) dma->desc_buf.area)[i];
desc->addr = cpu_to_le32(addr);
desc->size = cpu_to_le16(period_bytes);
desc->ctlreserved = cpu_to_le16(PRD_EOP);
desc_addr += sizeof(struct cs5535audio_dma_desc);
addr += period_bytes;
}
/* we reserved one dummy descriptor at the end to do the PRD jump */
lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
lastdesc->size = 0;
lastdesc->ctlreserved = cpu_to_le16(PRD_JMP);
jmpprd_addr = cpu_to_le32(lastdesc->addr +
(sizeof(struct cs5535audio_dma_desc)*periods));
dma->substream = substream;
dma->period_bytes = period_bytes;
dma->periods = periods;
spin_lock_irq(&cs5535au->reg_lock);
dma->ops->disable_dma(cs5535au);
dma->ops->setup_prd(cs5535au, jmpprd_addr);
spin_unlock_irq(&cs5535au->reg_lock);
return 0;
}
static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
{
cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
}
static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
{
cs_writeb(cs5535au, ACC_BM0_CMD, 0);
}
static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
{
cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
}
static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
u32 prd_addr)
{
cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
}
static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
{
return cs_readl(cs5535au, ACC_BM0_PRD);
}
static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
{
return cs_readl(cs5535au, ACC_BM0_PNTR);
}
static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
{
cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
}
static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
{
cs_writeb(cs5535au, ACC_BM1_CMD, 0);
}
static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
{
cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
}
static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
u32 prd_addr)
{
cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
}
static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
{
return cs_readl(cs5535au, ACC_BM1_PRD);
}
static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
{
return cs_readl(cs5535au, ACC_BM1_PNTR);
}
static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
struct cs5535audio_dma *dma,
struct snd_pcm_substream *substream)
{
snd_dma_free_pages(&dma->desc_buf);
dma->desc_buf.area = NULL;
dma->substream = NULL;
}
static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
struct cs5535audio_dma *dma = substream->runtime->private_data;
int err;
err = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
if (err < 0)
return err;
dma->buf_addr = substream->runtime->dma_addr;
dma->buf_bytes = params_buffer_bytes(hw_params);
err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
params_periods(hw_params),
params_period_bytes(hw_params));
if (!err)
dma->pcm_open_flag = 1;
return err;
}
static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
{
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
struct cs5535audio_dma *dma = substream->runtime->private_data;
if (dma->pcm_open_flag) {
if (substream == cs5535au->playback_substream)
snd_ac97_update_power(cs5535au->ac97,
AC97_PCM_FRONT_DAC_RATE, 0);
else
snd_ac97_update_power(cs5535au->ac97,
AC97_PCM_LR_ADC_RATE, 0);
dma->pcm_open_flag = 0;
}
cs5535audio_clear_dma_packets(cs5535au, dma, substream);
return snd_pcm_lib_free_pages(substream);
}
static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
{
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
substream->runtime->rate);
}
static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
struct cs5535audio_dma *dma = substream->runtime->private_data;
int err = 0;
spin_lock(&cs5535au->reg_lock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
dma->ops->pause_dma(cs5535au);
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
dma->ops->enable_dma(cs5535au);
break;
case SNDRV_PCM_TRIGGER_START:
dma->ops->enable_dma(cs5535au);
break;
case SNDRV_PCM_TRIGGER_RESUME:
dma->ops->enable_dma(cs5535au);
break;
case SNDRV_PCM_TRIGGER_STOP:
dma->ops->disable_dma(cs5535au);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
dma->ops->disable_dma(cs5535au);
break;
default:
snd_printk(KERN_ERR "unhandled trigger\n");
err = -EINVAL;
break;
}
spin_unlock(&cs5535au->reg_lock);
return err;
}
static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
*substream)
{
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
u32 curdma;
struct cs5535audio_dma *dma;
dma = substream->runtime->private_data;
curdma = dma->ops->read_dma_pntr(cs5535au);
if (curdma < dma->buf_addr) {
snd_printk(KERN_ERR "curdma=%x < %x bufaddr.\n",
curdma, dma->buf_addr);
return 0;
}
curdma -= dma->buf_addr;
if (curdma >= dma->buf_bytes) {
snd_printk(KERN_ERR "diff=%x >= %x buf_bytes.\n",
curdma, dma->buf_bytes);
return 0;
}
return bytes_to_frames(substream->runtime, curdma);
}
static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
{
int err;
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->hw = snd_cs5535audio_capture;
runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC];
snd_pcm_limit_hw_rates(runtime);
cs5535au->capture_substream = substream;
runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
if ((err = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
return err;
olpc_capture_open(cs5535au->ac97);
return 0;
}
static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
{
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
olpc_capture_close(cs5535au->ac97);
return 0;
}
static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream)
{
struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE,
substream->runtime->rate);
}
static struct snd_pcm_ops snd_cs5535audio_playback_ops = {
.open = snd_cs5535audio_playback_open,
.close = snd_cs5535audio_playback_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_cs5535audio_hw_params,
.hw_free = snd_cs5535audio_hw_free,
.prepare = snd_cs5535audio_playback_prepare,
.trigger = snd_cs5535audio_trigger,
.pointer = snd_cs5535audio_pcm_pointer,
};
static struct snd_pcm_ops snd_cs5535audio_capture_ops = {
.open = snd_cs5535audio_capture_open,
.close = snd_cs5535audio_capture_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_cs5535audio_hw_params,
.hw_free = snd_cs5535audio_hw_free,
.prepare = snd_cs5535audio_capture_prepare,
.trigger = snd_cs5535audio_trigger,
.pointer = snd_cs5535audio_pcm_pointer,
};
static struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = {
.type = CS5535AUDIO_DMA_PLAYBACK,
.enable_dma = cs5535audio_playback_enable_dma,
.disable_dma = cs5535audio_playback_disable_dma,
.setup_prd = cs5535audio_playback_setup_prd,
.read_prd = cs5535audio_playback_read_prd,
.pause_dma = cs5535audio_playback_pause_dma,
.read_dma_pntr = cs5535audio_playback_read_dma_pntr,
};
static struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = {
.type = CS5535AUDIO_DMA_CAPTURE,
.enable_dma = cs5535audio_capture_enable_dma,
.disable_dma = cs5535audio_capture_disable_dma,
.setup_prd = cs5535audio_capture_setup_prd,
.read_prd = cs5535audio_capture_read_prd,
.pause_dma = cs5535audio_capture_pause_dma,
.read_dma_pntr = cs5535audio_capture_read_dma_pntr,
};
int snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
{
struct snd_pcm *pcm;
int err;
err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
if (err < 0)
return err;
cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
&snd_cs5535audio_playback_dma_ops;
cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
&snd_cs5535audio_capture_dma_ops;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
&snd_cs5535audio_playback_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
&snd_cs5535audio_capture_ops);
pcm->private_data = cs5535au;
pcm->info_flags = 0;
strcpy(pcm->name, "CS5535 Audio");
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(cs5535au->pci),
64*1024, 128*1024);
cs5535au->pcm = pcm;
return 0;
}