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OpenCloudOS-Kernel/sound/usb/6fire/pcm.c

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/*
* Linux driver for TerraTec DMX 6Fire USB
*
* PCM driver
*
* Author: Torsten Schenk <torsten.schenk@zoho.com>
* Created: Jan 01, 2011
* Copyright: (C) Torsten Schenk
*
* 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.
*/
#include "pcm.h"
#include "chip.h"
#include "comm.h"
#include "control.h"
enum {
OUT_N_CHANNELS = 6, IN_N_CHANNELS = 4
};
/* keep next two synced with
* FW_EP_W_MAX_PACKET_SIZE[] and RATES_MAX_PACKET_SIZE
* and CONTROL_RATE_XXX in control.h */
static const int rates_in_packet_size[] = { 228, 228, 420, 420, 404, 404 };
static const int rates_out_packet_size[] = { 228, 228, 420, 420, 604, 604 };
static const int rates[] = { 44100, 48000, 88200, 96000, 176400, 192000 };
static const int rates_alsaid[] = {
SNDRV_PCM_RATE_44100, SNDRV_PCM_RATE_48000,
SNDRV_PCM_RATE_88200, SNDRV_PCM_RATE_96000,
SNDRV_PCM_RATE_176400, SNDRV_PCM_RATE_192000 };
enum { /* settings for pcm */
OUT_EP = 6, IN_EP = 2, MAX_BUFSIZE = 128 * 1024
};
enum { /* pcm streaming states */
STREAM_DISABLED, /* no pcm streaming */
STREAM_STARTING, /* pcm streaming requested, waiting to become ready */
STREAM_RUNNING, /* pcm streaming running */
STREAM_STOPPING
};
static const struct snd_pcm_hardware pcm_hw = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_BATCH,
.formats = SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
.rates = SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000 |
SNDRV_PCM_RATE_88200 |
SNDRV_PCM_RATE_96000 |
SNDRV_PCM_RATE_176400 |
SNDRV_PCM_RATE_192000,
.rate_min = 44100,
.rate_max = 192000,
.channels_min = 1,
.channels_max = 0, /* set in pcm_open, depending on capture/playback */
.buffer_bytes_max = MAX_BUFSIZE,
.period_bytes_min = PCM_N_PACKETS_PER_URB * (PCM_MAX_PACKET_SIZE - 4),
.period_bytes_max = MAX_BUFSIZE,
.periods_min = 2,
.periods_max = 1024
};
static int usb6fire_pcm_set_rate(struct pcm_runtime *rt)
{
int ret;
struct control_runtime *ctrl_rt = rt->chip->control;
ctrl_rt->usb_streaming = false;
ret = ctrl_rt->update_streaming(ctrl_rt);
if (ret < 0) {
dev_err(&rt->chip->dev->dev,
"error stopping streaming while setting samplerate %d.\n",
rates[rt->rate]);
return ret;
}
ret = ctrl_rt->set_rate(ctrl_rt, rt->rate);
if (ret < 0) {
dev_err(&rt->chip->dev->dev,
"error setting samplerate %d.\n",
rates[rt->rate]);
return ret;
}
ret = ctrl_rt->set_channels(ctrl_rt, OUT_N_CHANNELS, IN_N_CHANNELS,
false, false);
if (ret < 0) {
dev_err(&rt->chip->dev->dev,
"error initializing channels while setting samplerate %d.\n",
rates[rt->rate]);
return ret;
}
ctrl_rt->usb_streaming = true;
ret = ctrl_rt->update_streaming(ctrl_rt);
if (ret < 0) {
dev_err(&rt->chip->dev->dev,
"error starting streaming while setting samplerate %d.\n",
rates[rt->rate]);
return ret;
}
rt->in_n_analog = IN_N_CHANNELS;
rt->out_n_analog = OUT_N_CHANNELS;
rt->in_packet_size = rates_in_packet_size[rt->rate];
rt->out_packet_size = rates_out_packet_size[rt->rate];
return 0;
}
static struct pcm_substream *usb6fire_pcm_get_substream(
struct snd_pcm_substream *alsa_sub)
{
struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
return &rt->playback;
else if (alsa_sub->stream == SNDRV_PCM_STREAM_CAPTURE)
return &rt->capture;
dev_err(&rt->chip->dev->dev, "error getting pcm substream slot.\n");
return NULL;
}
/* call with stream_mutex locked */
static void usb6fire_pcm_stream_stop(struct pcm_runtime *rt)
{
int i;
struct control_runtime *ctrl_rt = rt->chip->control;
if (rt->stream_state != STREAM_DISABLED) {
rt->stream_state = STREAM_STOPPING;
for (i = 0; i < PCM_N_URBS; i++) {
usb_kill_urb(&rt->in_urbs[i].instance);
usb_kill_urb(&rt->out_urbs[i].instance);
}
ctrl_rt->usb_streaming = false;
ctrl_rt->update_streaming(ctrl_rt);
rt->stream_state = STREAM_DISABLED;
}
}
/* call with stream_mutex locked */
static int usb6fire_pcm_stream_start(struct pcm_runtime *rt)
{
int ret;
int i;
int k;
struct usb_iso_packet_descriptor *packet;
if (rt->stream_state == STREAM_DISABLED) {
/* submit our in urbs */
rt->stream_wait_cond = false;
rt->stream_state = STREAM_STARTING;
for (i = 0; i < PCM_N_URBS; i++) {
for (k = 0; k < PCM_N_PACKETS_PER_URB; k++) {
packet = &rt->in_urbs[i].packets[k];
packet->offset = k * rt->in_packet_size;
packet->length = rt->in_packet_size;
packet->actual_length = 0;
packet->status = 0;
}
ret = usb_submit_urb(&rt->in_urbs[i].instance,
GFP_ATOMIC);
if (ret) {
usb6fire_pcm_stream_stop(rt);
return ret;
}
}
/* wait for first out urb to return (sent in in urb handler) */
wait_event_timeout(rt->stream_wait_queue, rt->stream_wait_cond,
HZ);
if (rt->stream_wait_cond)
rt->stream_state = STREAM_RUNNING;
else {
usb6fire_pcm_stream_stop(rt);
return -EIO;
}
}
return 0;
}
/* call with substream locked */
static void usb6fire_pcm_capture(struct pcm_substream *sub, struct pcm_urb *urb)
{
int i;
int frame;
int frame_count;
unsigned int total_length = 0;
struct pcm_runtime *rt = snd_pcm_substream_chip(sub->instance);
struct snd_pcm_runtime *alsa_rt = sub->instance->runtime;
u32 *src = NULL;
u32 *dest = (u32 *) (alsa_rt->dma_area + sub->dma_off
* (alsa_rt->frame_bits >> 3));
u32 *dest_end = (u32 *) (alsa_rt->dma_area + alsa_rt->buffer_size
* (alsa_rt->frame_bits >> 3));
int bytes_per_frame = alsa_rt->channels << 2;
for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
/* at least 4 header bytes for valid packet.
* after that: 32 bits per sample for analog channels */
if (urb->packets[i].actual_length > 4)
frame_count = (urb->packets[i].actual_length - 4)
/ (rt->in_n_analog << 2);
else
frame_count = 0;
if (alsa_rt->format == SNDRV_PCM_FORMAT_S24_LE)
src = (u32 *) (urb->buffer + total_length);
else if (alsa_rt->format == SNDRV_PCM_FORMAT_S32_LE)
src = (u32 *) (urb->buffer - 1 + total_length);
else
return;
src++; /* skip leading 4 bytes of every packet */
total_length += urb->packets[i].length;
for (frame = 0; frame < frame_count; frame++) {
memcpy(dest, src, bytes_per_frame);
dest += alsa_rt->channels;
src += rt->in_n_analog;
sub->dma_off++;
sub->period_off++;
if (dest == dest_end) {
sub->dma_off = 0;
dest = (u32 *) alsa_rt->dma_area;
}
}
}
}
/* call with substream locked */
static void usb6fire_pcm_playback(struct pcm_substream *sub,
struct pcm_urb *urb)
{
int i;
int frame;
int frame_count;
struct pcm_runtime *rt = snd_pcm_substream_chip(sub->instance);
struct snd_pcm_runtime *alsa_rt = sub->instance->runtime;
u32 *src = (u32 *) (alsa_rt->dma_area + sub->dma_off
* (alsa_rt->frame_bits >> 3));
u32 *src_end = (u32 *) (alsa_rt->dma_area + alsa_rt->buffer_size
* (alsa_rt->frame_bits >> 3));
u32 *dest;
int bytes_per_frame = alsa_rt->channels << 2;
if (alsa_rt->format == SNDRV_PCM_FORMAT_S32_LE)
dest = (u32 *) (urb->buffer - 1);
else if (alsa_rt->format == SNDRV_PCM_FORMAT_S24_LE)
dest = (u32 *) (urb->buffer);
else {
dev_err(&rt->chip->dev->dev, "Unknown sample format.");
return;
}
for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
/* at least 4 header bytes for valid packet.
* after that: 32 bits per sample for analog channels */
if (urb->packets[i].length > 4)
frame_count = (urb->packets[i].length - 4)
/ (rt->out_n_analog << 2);
else
frame_count = 0;
dest++; /* skip leading 4 bytes of every frame */
for (frame = 0; frame < frame_count; frame++) {
memcpy(dest, src, bytes_per_frame);
src += alsa_rt->channels;
dest += rt->out_n_analog;
sub->dma_off++;
sub->period_off++;
if (src == src_end) {
src = (u32 *) alsa_rt->dma_area;
sub->dma_off = 0;
}
}
}
}
static void usb6fire_pcm_in_urb_handler(struct urb *usb_urb)
{
struct pcm_urb *in_urb = usb_urb->context;
struct pcm_urb *out_urb = in_urb->peer;
struct pcm_runtime *rt = in_urb->chip->pcm;
struct pcm_substream *sub;
unsigned long flags;
int total_length = 0;
int frame_count;
int frame;
int channel;
int i;
u8 *dest;
if (usb_urb->status || rt->panic || rt->stream_state == STREAM_STOPPING)
return;
for (i = 0; i < PCM_N_PACKETS_PER_URB; i++)
if (in_urb->packets[i].status) {
rt->panic = true;
return;
}
if (rt->stream_state == STREAM_DISABLED) {
dev_err(&rt->chip->dev->dev,
"internal error: stream disabled in in-urb handler.\n");
return;
}
/* receive our capture data */
sub = &rt->capture;
spin_lock_irqsave(&sub->lock, flags);
if (sub->active) {
usb6fire_pcm_capture(sub, in_urb);
if (sub->period_off >= sub->instance->runtime->period_size) {
sub->period_off %= sub->instance->runtime->period_size;
spin_unlock_irqrestore(&sub->lock, flags);
snd_pcm_period_elapsed(sub->instance);
} else
spin_unlock_irqrestore(&sub->lock, flags);
} else
spin_unlock_irqrestore(&sub->lock, flags);
/* setup out urb structure */
for (i = 0; i < PCM_N_PACKETS_PER_URB; i++) {
out_urb->packets[i].offset = total_length;
out_urb->packets[i].length = (in_urb->packets[i].actual_length
- 4) / (rt->in_n_analog << 2)
* (rt->out_n_analog << 2) + 4;
out_urb->packets[i].status = 0;
total_length += out_urb->packets[i].length;
}
memset(out_urb->buffer, 0, total_length);
/* now send our playback data (if a free out urb was found) */
sub = &rt->playback;
spin_lock_irqsave(&sub->lock, flags);
if (sub->active) {
usb6fire_pcm_playback(sub, out_urb);
if (sub->period_off >= sub->instance->runtime->period_size) {
sub->period_off %= sub->instance->runtime->period_size;
spin_unlock_irqrestore(&sub->lock, flags);
snd_pcm_period_elapsed(sub->instance);
} else
spin_unlock_irqrestore(&sub->lock, flags);
} else
spin_unlock_irqrestore(&sub->lock, flags);
/* setup the 4th byte of each sample (0x40 for analog channels) */
dest = out_urb->buffer;
for (i = 0; i < PCM_N_PACKETS_PER_URB; i++)
if (out_urb->packets[i].length >= 4) {
frame_count = (out_urb->packets[i].length - 4)
/ (rt->out_n_analog << 2);
*(dest++) = 0xaa;
*(dest++) = 0xaa;
*(dest++) = frame_count;
*(dest++) = 0x00;
for (frame = 0; frame < frame_count; frame++)
for (channel = 0;
channel < rt->out_n_analog;
channel++) {
dest += 3; /* skip sample data */
*(dest++) = 0x40;
}
}
usb_submit_urb(&out_urb->instance, GFP_ATOMIC);
usb_submit_urb(&in_urb->instance, GFP_ATOMIC);
}
static void usb6fire_pcm_out_urb_handler(struct urb *usb_urb)
{
struct pcm_urb *urb = usb_urb->context;
struct pcm_runtime *rt = urb->chip->pcm;
if (rt->stream_state == STREAM_STARTING) {
rt->stream_wait_cond = true;
wake_up(&rt->stream_wait_queue);
}
}
static int usb6fire_pcm_open(struct snd_pcm_substream *alsa_sub)
{
struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
struct pcm_substream *sub = NULL;
struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;
if (rt->panic)
return -EPIPE;
mutex_lock(&rt->stream_mutex);
alsa_rt->hw = pcm_hw;
if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (rt->rate < ARRAY_SIZE(rates))
alsa_rt->hw.rates = rates_alsaid[rt->rate];
alsa_rt->hw.channels_max = OUT_N_CHANNELS;
sub = &rt->playback;
} else if (alsa_sub->stream == SNDRV_PCM_STREAM_CAPTURE) {
if (rt->rate < ARRAY_SIZE(rates))
alsa_rt->hw.rates = rates_alsaid[rt->rate];
alsa_rt->hw.channels_max = IN_N_CHANNELS;
sub = &rt->capture;
}
if (!sub) {
mutex_unlock(&rt->stream_mutex);
dev_err(&rt->chip->dev->dev, "invalid stream type.\n");
return -EINVAL;
}
sub->instance = alsa_sub;
sub->active = false;
mutex_unlock(&rt->stream_mutex);
return 0;
}
static int usb6fire_pcm_close(struct snd_pcm_substream *alsa_sub)
{
struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
unsigned long flags;
if (rt->panic)
return 0;
mutex_lock(&rt->stream_mutex);
if (sub) {
/* deactivate substream */
spin_lock_irqsave(&sub->lock, flags);
sub->instance = NULL;
sub->active = false;
spin_unlock_irqrestore(&sub->lock, flags);
/* all substreams closed? if so, stop streaming */
if (!rt->playback.instance && !rt->capture.instance) {
usb6fire_pcm_stream_stop(rt);
rt->rate = ARRAY_SIZE(rates);
}
}
mutex_unlock(&rt->stream_mutex);
return 0;
}
static int usb6fire_pcm_hw_params(struct snd_pcm_substream *alsa_sub,
struct snd_pcm_hw_params *hw_params)
{
return snd_pcm_lib_alloc_vmalloc_buffer(alsa_sub,
params_buffer_bytes(hw_params));
}
static int usb6fire_pcm_hw_free(struct snd_pcm_substream *alsa_sub)
{
return snd_pcm_lib_free_vmalloc_buffer(alsa_sub);
}
static int usb6fire_pcm_prepare(struct snd_pcm_substream *alsa_sub)
{
struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime;
int ret;
if (rt->panic)
return -EPIPE;
if (!sub)
return -ENODEV;
mutex_lock(&rt->stream_mutex);
sub->dma_off = 0;
sub->period_off = 0;
if (rt->stream_state == STREAM_DISABLED) {
for (rt->rate = 0; rt->rate < ARRAY_SIZE(rates); rt->rate++)
if (alsa_rt->rate == rates[rt->rate])
break;
if (rt->rate == ARRAY_SIZE(rates)) {
mutex_unlock(&rt->stream_mutex);
dev_err(&rt->chip->dev->dev,
"invalid rate %d in prepare.\n",
alsa_rt->rate);
return -EINVAL;
}
ret = usb6fire_pcm_set_rate(rt);
if (ret) {
mutex_unlock(&rt->stream_mutex);
return ret;
}
ret = usb6fire_pcm_stream_start(rt);
if (ret) {
mutex_unlock(&rt->stream_mutex);
dev_err(&rt->chip->dev->dev,
"could not start pcm stream.\n");
return ret;
}
}
mutex_unlock(&rt->stream_mutex);
return 0;
}
static int usb6fire_pcm_trigger(struct snd_pcm_substream *alsa_sub, int cmd)
{
struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
unsigned long flags;
if (rt->panic)
return -EPIPE;
if (!sub)
return -ENODEV;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
spin_lock_irqsave(&sub->lock, flags);
sub->active = true;
spin_unlock_irqrestore(&sub->lock, flags);
return 0;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
spin_lock_irqsave(&sub->lock, flags);
sub->active = false;
spin_unlock_irqrestore(&sub->lock, flags);
return 0;
default:
return -EINVAL;
}
}
static snd_pcm_uframes_t usb6fire_pcm_pointer(
struct snd_pcm_substream *alsa_sub)
{
struct pcm_substream *sub = usb6fire_pcm_get_substream(alsa_sub);
struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
unsigned long flags;
snd_pcm_uframes_t ret;
if (rt->panic || !sub)
return SNDRV_PCM_POS_XRUN;
spin_lock_irqsave(&sub->lock, flags);
ret = sub->dma_off;
spin_unlock_irqrestore(&sub->lock, flags);
return ret;
}
static struct snd_pcm_ops pcm_ops = {
.open = usb6fire_pcm_open,
.close = usb6fire_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = usb6fire_pcm_hw_params,
.hw_free = usb6fire_pcm_hw_free,
.prepare = usb6fire_pcm_prepare,
.trigger = usb6fire_pcm_trigger,
.pointer = usb6fire_pcm_pointer,
.page = snd_pcm_lib_get_vmalloc_page,
.mmap = snd_pcm_lib_mmap_vmalloc,
};
static void usb6fire_pcm_init_urb(struct pcm_urb *urb,
struct sfire_chip *chip, bool in, int ep,
void (*handler)(struct urb *))
{
urb->chip = chip;
usb_init_urb(&urb->instance);
urb->instance.transfer_buffer = urb->buffer;
urb->instance.transfer_buffer_length =
PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE;
urb->instance.dev = chip->dev;
urb->instance.pipe = in ? usb_rcvisocpipe(chip->dev, ep)
: usb_sndisocpipe(chip->dev, ep);
urb->instance.interval = 1;
urb->instance.complete = handler;
urb->instance.context = urb;
urb->instance.number_of_packets = PCM_N_PACKETS_PER_URB;
}
static int usb6fire_pcm_buffers_init(struct pcm_runtime *rt)
{
int i;
for (i = 0; i < PCM_N_URBS; i++) {
rt->out_urbs[i].buffer = kzalloc(PCM_N_PACKETS_PER_URB
* PCM_MAX_PACKET_SIZE, GFP_KERNEL);
if (!rt->out_urbs[i].buffer)
return -ENOMEM;
rt->in_urbs[i].buffer = kzalloc(PCM_N_PACKETS_PER_URB
* PCM_MAX_PACKET_SIZE, GFP_KERNEL);
if (!rt->in_urbs[i].buffer)
return -ENOMEM;
}
return 0;
}
static void usb6fire_pcm_buffers_destroy(struct pcm_runtime *rt)
{
int i;
for (i = 0; i < PCM_N_URBS; i++) {
kfree(rt->out_urbs[i].buffer);
kfree(rt->in_urbs[i].buffer);
}
}
int usb6fire_pcm_init(struct sfire_chip *chip)
{
int i;
int ret;
struct snd_pcm *pcm;
struct pcm_runtime *rt =
kzalloc(sizeof(struct pcm_runtime), GFP_KERNEL);
if (!rt)
return -ENOMEM;
ret = usb6fire_pcm_buffers_init(rt);
if (ret) {
usb6fire_pcm_buffers_destroy(rt);
kfree(rt);
return ret;
}
rt->chip = chip;
rt->stream_state = STREAM_DISABLED;
rt->rate = ARRAY_SIZE(rates);
init_waitqueue_head(&rt->stream_wait_queue);
mutex_init(&rt->stream_mutex);
spin_lock_init(&rt->playback.lock);
spin_lock_init(&rt->capture.lock);
for (i = 0; i < PCM_N_URBS; i++) {
usb6fire_pcm_init_urb(&rt->in_urbs[i], chip, true, IN_EP,
usb6fire_pcm_in_urb_handler);
usb6fire_pcm_init_urb(&rt->out_urbs[i], chip, false, OUT_EP,
usb6fire_pcm_out_urb_handler);
rt->in_urbs[i].peer = &rt->out_urbs[i];
rt->out_urbs[i].peer = &rt->in_urbs[i];
}
ret = snd_pcm_new(chip->card, "DMX6FireUSB", 0, 1, 1, &pcm);
if (ret < 0) {
usb6fire_pcm_buffers_destroy(rt);
kfree(rt);
dev_err(&chip->dev->dev, "cannot create pcm instance.\n");
return ret;
}
pcm->private_data = rt;
strcpy(pcm->name, "DMX 6Fire USB");
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_ops);
if (ret) {
usb6fire_pcm_buffers_destroy(rt);
kfree(rt);
dev_err(&chip->dev->dev,
"error preallocating pcm buffers.\n");
return ret;
}
rt->instance = pcm;
chip->pcm = rt;
return 0;
}
void usb6fire_pcm_abort(struct sfire_chip *chip)
{
struct pcm_runtime *rt = chip->pcm;
unsigned long flags;
int i;
if (rt) {
rt->panic = true;
if (rt->playback.instance) {
snd_pcm_stream_lock_irqsave(rt->playback.instance, flags);
snd_pcm_stop(rt->playback.instance,
SNDRV_PCM_STATE_XRUN);
snd_pcm_stream_unlock_irqrestore(rt->playback.instance, flags);
}
if (rt->capture.instance) {
snd_pcm_stream_lock_irqsave(rt->capture.instance, flags);
snd_pcm_stop(rt->capture.instance,
SNDRV_PCM_STATE_XRUN);
snd_pcm_stream_unlock_irqrestore(rt->capture.instance, flags);
}
for (i = 0; i < PCM_N_URBS; i++) {
usb_poison_urb(&rt->in_urbs[i].instance);
usb_poison_urb(&rt->out_urbs[i].instance);
}
}
}
void usb6fire_pcm_destroy(struct sfire_chip *chip)
{
struct pcm_runtime *rt = chip->pcm;
usb6fire_pcm_buffers_destroy(rt);
kfree(rt);
chip->pcm = NULL;
}
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