linux_dsm_epyc7002/sound/usb/6fire/pcm.c
Takashi Iwai fa84cf094e ALSA: pcm: Nuke snd_pcm_lib_mmap_vmalloc()
snd_pcm_lib_mmap_vmalloc() was supposed to be implemented with
somewhat special for vmalloc handling, but in the end, this turned to
just the default handler, i.e. NULL.  As the situation has never
changed over decades, let's rip it off.

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-07-18 08:24:29 +02:00

710 lines
18 KiB
C

/*
* 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 const 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,
};
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 = kcalloc(PCM_MAX_PACKET_SIZE,
PCM_N_PACKETS_PER_URB,
GFP_KERNEL);
if (!rt->out_urbs[i].buffer)
return -ENOMEM;
rt->in_urbs[i].buffer = kcalloc(PCM_MAX_PACKET_SIZE,
PCM_N_PACKETS_PER_URB,
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;
int i;
if (rt) {
rt->panic = true;
if (rt->playback.instance)
snd_pcm_stop_xrun(rt->playback.instance);
if (rt->capture.instance)
snd_pcm_stop_xrun(rt->capture.instance);
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;
}