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/*
* Line6 Linux USB driver - 0.8.0
*
* Copyright (C) 2004-2009 Markus Grabner (grabner@icg.tugraz.at)
*
* 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, version 2.
*
*/
#include "driver.h"
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "audio.h"
#include "pcm.h"
#include "pod.h"
#include "playback.h"
/*
Software stereo volume control.
*/
static void change_volume(struct urb *urb_out, int volume[],
int bytes_per_frame)
{
int chn = 0;
if (volume[0] == 256 && volume[1] == 256)
return; /* maximum volume - no change */
if (bytes_per_frame == 4) {
short *p, *buf_end;
p = (short *)urb_out->transfer_buffer;
buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
for (; p < buf_end; ++p) {
*p = (*p * volume[chn & 1]) >> 8;
++chn;
}
} else if (bytes_per_frame == 6) {
unsigned char *p, *buf_end;
p = (unsigned char *)urb_out->transfer_buffer;
buf_end = p + urb_out->transfer_buffer_length;
for (; p < buf_end; p += 3) {
int val;
val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
val = (val * volume[chn & 1]) >> 8;
p[0] = val;
p[1] = val >> 8;
p[2] = val >> 16;
++chn;
}
}
}
/*
Find a free URB, prepare audio data, and submit URB.
*/
static int submit_audio_out_urb(struct snd_pcm_substream *substream)
{
int index;
unsigned long flags;
int i, urb_size, urb_frames;
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
const int frame_increment =
line6pcm->properties->snd_line6_rates.rats[0].num_min;
const int frame_factor =
line6pcm->properties->snd_line6_rates.rats[0].den *
(USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
struct snd_pcm_runtime *runtime = substream->runtime;
struct urb *urb_out;
spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
index =
find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
if (index < 0 || index >= LINE6_ISO_BUFFERS) {
spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
dev_err(s2m(substream), "no free URB found\n");
return -EINVAL;
}
urb_out = line6pcm->urb_audio_out[index];
urb_size = 0;
for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
/* compute frame size for given sampling rate */
int n, fs;
struct usb_iso_packet_descriptor *fout =
&urb_out->iso_frame_desc[i];
line6pcm->count_out += frame_increment;
n = line6pcm->count_out / frame_factor;
line6pcm->count_out -= n * frame_factor;
fs = n * bytes_per_frame;
fout->offset = urb_size;
fout->length = fs;
urb_size += fs;
}
urb_frames = urb_size / bytes_per_frame;
if (test_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags)) {
urb_out->transfer_buffer = line6pcm->wrap_out;
memset(line6pcm->wrap_out, 0, urb_size);
} else {
if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
/*
The transferred area goes over buffer boundary,
copy the data to the temp buffer.
*/
int len;
len = runtime->buffer_size - line6pcm->pos_out;
urb_out->transfer_buffer = line6pcm->wrap_out;
if (len > 0) {
memcpy(line6pcm->wrap_out,
runtime->dma_area +
line6pcm->pos_out * bytes_per_frame,
len * bytes_per_frame);
memcpy(line6pcm->wrap_out +
len * bytes_per_frame, runtime->dma_area,
(urb_frames - len) * bytes_per_frame);
} else {
/* this is somewhat paranoid */
dev_err(s2m(substream),
"driver bug: len = %d\n", len);
}
} else {
/* set the buffer pointer */
urb_out->transfer_buffer =
runtime->dma_area +
line6pcm->pos_out * bytes_per_frame;
}
}
line6pcm->pos_out += urb_frames;
if (line6pcm->pos_out >= runtime->buffer_size)
line6pcm->pos_out -= runtime->buffer_size;
urb_out->transfer_buffer_length = urb_size;
urb_out->context = substream;
change_volume(urb_out, line6pcm->volume, bytes_per_frame);
#if DO_DUMP_PCM_SEND
for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
struct usb_iso_packet_descriptor *fout =
&urb_out->iso_frame_desc[i];
line6_write_hexdump(line6pcm->line6, 'P',
urb_out->transfer_buffer + fout->offset,
fout->length);
}
#endif
if (usb_submit_urb(urb_out, GFP_ATOMIC) == 0)
set_bit(index, &line6pcm->active_urb_out);
else
dev_err(s2m(substream), "URB out #%d submission failed\n",
index);
spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
return 0;
}
/*
Submit all currently available playback URBs.
*/
static int submit_audio_out_all_urbs(struct snd_pcm_substream *substream)
{
int ret, i;
for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
ret = submit_audio_out_urb(substream);
if (ret < 0)
return ret;
}
return 0;
}
/*
Unlink all currently active playback URBs.
*/
static void unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
{
unsigned int i;
for (i = LINE6_ISO_BUFFERS; i--;) {
if (test_bit(i, &line6pcm->active_urb_out)) {
if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
struct urb *u = line6pcm->urb_audio_out[i];
usb_unlink_urb(u);
}
}
}
}
/*
Wait until unlinking of all currently active playback URBs has been finished.
*/
static void wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
{
int timeout = HZ;
unsigned int i;
int alive;
do {
alive = 0;
for (i = LINE6_ISO_BUFFERS; i--;) {
if (test_bit(i, &line6pcm->active_urb_out))
alive++;
}
if (!alive)
break;
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(1);
} while (--timeout > 0);
if (alive)
snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
line6pcm->active_urb_out = 0;
line6pcm->unlink_urb_out = 0;
}
/*
Unlink all currently active playback URBs, and wait for finishing.
*/
void unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
{
unlink_audio_out_urbs(line6pcm);
wait_clear_audio_out_urbs(line6pcm);
}
/*
Callback for completed playback URB.
*/
static void audio_out_callback(struct urb *urb)
{
int i, index, length = 0, shutdown = 0;
unsigned long flags;
struct snd_pcm_substream *substream =
(struct snd_pcm_substream *)urb->context;
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
/* find index of URB */
for (index = LINE6_ISO_BUFFERS; index--;)
if (urb == line6pcm->urb_audio_out[index])
break;
if (index < 0)
return; /* URB has been unlinked asynchronously */
for (i = LINE6_ISO_PACKETS; i--;)
length += urb->iso_frame_desc[i].length;
spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
line6pcm->pos_out_done +=
length / line6pcm->properties->bytes_per_frame;
if (line6pcm->pos_out_done >= runtime->buffer_size)
line6pcm->pos_out_done -= runtime->buffer_size;
clear_bit(index, &line6pcm->active_urb_out);
for (i = LINE6_ISO_PACKETS; i--;)
if (urb->iso_frame_desc[i].status == -ESHUTDOWN) {
shutdown = 1;
break;
}
if (test_bit(index, &line6pcm->unlink_urb_out))
shutdown = 1;
spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
if (!shutdown) {
submit_audio_out_urb(substream);
line6pcm->bytes_out += length;
if (line6pcm->bytes_out >= line6pcm->period_out) {
line6pcm->bytes_out -= line6pcm->period_out;
snd_pcm_period_elapsed(substream);
}
}
}
/* open playback callback */
static int snd_line6_playback_open(struct snd_pcm_substream *substream)
{
int err;
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
(&line6pcm->properties->
snd_line6_rates));
if (err < 0)
return err;
runtime->hw = line6pcm->properties->snd_line6_playback_hw;
return 0;
}
/* close playback callback */
static int snd_line6_playback_close(struct snd_pcm_substream *substream)
{
return 0;
}
/* hw_params playback callback */
static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
int ret;
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
/* -- Florian Demski [FD] */
/* don't ask me why, but this fixes the bug on my machine */
if (line6pcm == NULL) {
if (substream->pcm == NULL)
return -ENOMEM;
if (substream->pcm->private_data == NULL)
return -ENOMEM;
substream->private_data = substream->pcm->private_data;
line6pcm = snd_pcm_substream_chip(substream);
}
/* -- [FD] end */
ret = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
if (ret < 0)
return ret;
line6pcm->period_out = params_period_bytes(hw_params);
line6pcm->wrap_out = kmalloc(2 * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
if (!line6pcm->wrap_out) {
dev_err(s2m(substream), "cannot malloc wrap_out\n");
return -ENOMEM;
}
return 0;
}
/* hw_free playback callback */
static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
{
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
unlink_wait_clear_audio_out_urbs(line6pcm);
kfree(line6pcm->wrap_out);
line6pcm->wrap_out = NULL;
return snd_pcm_lib_free_pages(substream);
}
/* trigger playback callback */
int snd_line6_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
int err;
line6pcm->count_out = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
if (!test_and_set_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags)) {
err = submit_audio_out_all_urbs(substream);
if (err < 0) {
clear_bit(BIT_RUNNING_PLAYBACK,
&line6pcm->flags);
return err;
}
}
break;
case SNDRV_PCM_TRIGGER_STOP:
if (test_and_clear_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags))
unlink_audio_out_urbs(line6pcm);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
set_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
clear_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
break;
default:
return -EINVAL;
}
return 0;
}
/* playback pointer callback */
static snd_pcm_uframes_t
snd_line6_playback_pointer(struct snd_pcm_substream *substream)
{
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
return line6pcm->pos_out_done;
}
/* playback operators */
struct snd_pcm_ops snd_line6_playback_ops = {
.open = snd_line6_playback_open,
.close = snd_line6_playback_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_line6_playback_hw_params,
.hw_free = snd_line6_playback_hw_free,
.prepare = snd_line6_prepare,
.trigger = snd_line6_trigger,
.pointer = snd_line6_playback_pointer,
};
int create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
{
int i;
/* create audio URBs and fill in constant values: */
for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
struct urb *urb;
/* URB for audio out: */
urb = line6pcm->urb_audio_out[i] =
usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
if (urb == NULL) {
dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
return -ENOMEM;
}
urb->dev = line6pcm->line6->usbdev;
urb->pipe =
usb_sndisocpipe(line6pcm->line6->usbdev,
line6pcm->
ep_audio_write & USB_ENDPOINT_NUMBER_MASK);
urb->transfer_flags = URB_ISO_ASAP;
urb->start_frame = -1;
urb->number_of_packets = LINE6_ISO_PACKETS;
urb->interval = LINE6_ISO_INTERVAL;
urb->error_count = 0;
urb->complete = audio_out_callback;
}
return 0;
}