445 lines
11 KiB
C
445 lines
11 KiB
C
|
/*
|
||
|
|
* Line 6 Linux USB driver
|
||
|
|
*
|
||
|
|
* Copyright (C) 2004-2010 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 <linux/slab.h>
|
||
|
|
#include <sound/core.h>
|
||
|
|
#include <sound/pcm.h>
|
||
|
|
#include <sound/pcm_params.h>
|
||
|
|
|
||
|
|
#include "capture.h"
|
||
|
|
#include "driver.h"
|
||
|
|
#include "pcm.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) {
|
||
|
|
__le16 *p, *buf_end;
|
||
|
|
|
||
|
|
p = (__le16 *)urb_out->transfer_buffer;
|
||
|
|
buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
|
||
|
|
|
||
|
|
for (; p < buf_end; ++p) {
|
||
|
|
short pv = le16_to_cpu(*p);
|
||
|
|
int val = (pv * volume[chn & 1]) >> 8;
|
||
|
|
pv = clamp(val, -0x8000, 0x7fff);
|
||
|
|
*p = cpu_to_le16(pv);
|
||
|
|
++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;
|
||
|
|
val = clamp(val, -0x800000, 0x7fffff);
|
||
|
|
p[0] = val;
|
||
|
|
p[1] = val >> 8;
|
||
|
|
p[2] = val >> 16;
|
||
|
|
++chn;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Create signal for impulse response test.
|
||
|
|
*/
|
||
|
|
static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
|
||
|
|
struct urb *urb_out, int bytes_per_frame)
|
||
|
|
{
|
||
|
|
int frames = urb_out->transfer_buffer_length / bytes_per_frame;
|
||
|
|
|
||
|
|
if (bytes_per_frame == 4) {
|
||
|
|
int i;
|
||
|
|
short *pi = (short *)line6pcm->prev_fbuf;
|
||
|
|
short *po = (short *)urb_out->transfer_buffer;
|
||
|
|
|
||
|
|
for (i = 0; i < frames; ++i) {
|
||
|
|
po[0] = pi[0];
|
||
|
|
po[1] = 0;
|
||
|
|
pi += 2;
|
||
|
|
po += 2;
|
||
|
|
}
|
||
|
|
} else if (bytes_per_frame == 6) {
|
||
|
|
int i, j;
|
||
|
|
unsigned char *pi = line6pcm->prev_fbuf;
|
||
|
|
unsigned char *po = urb_out->transfer_buffer;
|
||
|
|
|
||
|
|
for (i = 0; i < frames; ++i) {
|
||
|
|
for (j = 0; j < bytes_per_frame / 2; ++j)
|
||
|
|
po[j] = pi[j];
|
||
|
|
|
||
|
|
for (; j < bytes_per_frame; ++j)
|
||
|
|
po[j] = 0;
|
||
|
|
|
||
|
|
pi += bytes_per_frame;
|
||
|
|
po += bytes_per_frame;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (--line6pcm->impulse_count <= 0) {
|
||
|
|
((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
|
||
|
|
1] =
|
||
|
|
line6pcm->impulse_volume;
|
||
|
|
line6pcm->impulse_count = line6pcm->impulse_period;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Add signal to buffer for software monitoring.
|
||
|
|
*/
|
||
|
|
static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
|
||
|
|
int volume, int bytes_per_frame)
|
||
|
|
{
|
||
|
|
if (volume == 0)
|
||
|
|
return; /* zero volume - no change */
|
||
|
|
|
||
|
|
if (bytes_per_frame == 4) {
|
||
|
|
__le16 *pi, *po, *buf_end;
|
||
|
|
|
||
|
|
pi = (__le16 *)signal;
|
||
|
|
po = (__le16 *)urb_out->transfer_buffer;
|
||
|
|
buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
|
||
|
|
|
||
|
|
for (; po < buf_end; ++pi, ++po) {
|
||
|
|
short pov = le16_to_cpu(*po);
|
||
|
|
short piv = le16_to_cpu(*pi);
|
||
|
|
int val = pov + ((piv * volume) >> 8);
|
||
|
|
pov = clamp(val, -0x8000, 0x7fff);
|
||
|
|
*po = cpu_to_le16(pov);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
We don't need to handle devices with 6 bytes per frame here
|
||
|
|
since they all support hardware monitoring.
|
||
|
|
*/
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Find a free URB, prepare audio data, and submit URB.
|
||
|
|
must be called in line6pcm->out.lock context
|
||
|
|
*/
|
||
|
|
static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
|
||
|
|
{
|
||
|
|
int index;
|
||
|
|
int i, urb_size, urb_frames;
|
||
|
|
int ret;
|
||
|
|
const int bytes_per_frame =
|
||
|
|
line6pcm->properties->bytes_per_channel *
|
||
|
|
line6pcm->properties->playback_hw.channels_max;
|
||
|
|
const int frame_increment =
|
||
|
|
line6pcm->properties->rates.rats[0].num_min;
|
||
|
|
const int frame_factor =
|
||
|
|
line6pcm->properties->rates.rats[0].den *
|
||
|
|
(line6pcm->line6->intervals_per_second / LINE6_ISO_INTERVAL);
|
||
|
|
struct urb *urb_out;
|
||
|
|
|
||
|
|
index = find_first_zero_bit(&line6pcm->out.active_urbs,
|
||
|
|
line6pcm->line6->iso_buffers);
|
||
|
|
|
||
|
|
if (index < 0 || index >= line6pcm->line6->iso_buffers) {
|
||
|
|
dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
urb_out = line6pcm->out.urbs[index];
|
||
|
|
urb_size = 0;
|
||
|
|
|
||
|
|
/* TODO: this may not work for LINE6_ISO_PACKETS != 1 */
|
||
|
|
for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
|
||
|
|
/* compute frame size for given sampling rate */
|
||
|
|
int fsize = 0;
|
||
|
|
struct usb_iso_packet_descriptor *fout =
|
||
|
|
&urb_out->iso_frame_desc[i];
|
||
|
|
|
||
|
|
fsize = line6pcm->prev_fsize;
|
||
|
|
if (fsize == 0) {
|
||
|
|
int n;
|
||
|
|
|
||
|
|
line6pcm->out.count += frame_increment;
|
||
|
|
n = line6pcm->out.count / frame_factor;
|
||
|
|
line6pcm->out.count -= n * frame_factor;
|
||
|
|
fsize = n;
|
||
|
|
}
|
||
|
|
|
||
|
|
fsize *= bytes_per_frame;
|
||
|
|
|
||
|
|
fout->offset = urb_size;
|
||
|
|
fout->length = fsize;
|
||
|
|
urb_size += fsize;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (urb_size == 0) {
|
||
|
|
/* can't determine URB size */
|
||
|
|
dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
urb_frames = urb_size / bytes_per_frame;
|
||
|
|
urb_out->transfer_buffer =
|
||
|
|
line6pcm->out.buffer +
|
||
|
|
index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_out;
|
||
|
|
urb_out->transfer_buffer_length = urb_size;
|
||
|
|
urb_out->context = line6pcm;
|
||
|
|
|
||
|
|
if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running) &&
|
||
|
|
!test_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags)) {
|
||
|
|
struct snd_pcm_runtime *runtime =
|
||
|
|
get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
|
||
|
|
|
||
|
|
if (line6pcm->out.pos + 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->out.pos;
|
||
|
|
|
||
|
|
if (len > 0) {
|
||
|
|
memcpy(urb_out->transfer_buffer,
|
||
|
|
runtime->dma_area +
|
||
|
|
line6pcm->out.pos * bytes_per_frame,
|
||
|
|
len * bytes_per_frame);
|
||
|
|
memcpy(urb_out->transfer_buffer +
|
||
|
|
len * bytes_per_frame, runtime->dma_area,
|
||
|
|
(urb_frames - len) * bytes_per_frame);
|
||
|
|
} else
|
||
|
|
dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
|
||
|
|
len);
|
||
|
|
} else {
|
||
|
|
memcpy(urb_out->transfer_buffer,
|
||
|
|
runtime->dma_area +
|
||
|
|
line6pcm->out.pos * bytes_per_frame,
|
||
|
|
urb_out->transfer_buffer_length);
|
||
|
|
}
|
||
|
|
|
||
|
|
line6pcm->out.pos += urb_frames;
|
||
|
|
if (line6pcm->out.pos >= runtime->buffer_size)
|
||
|
|
line6pcm->out.pos -= runtime->buffer_size;
|
||
|
|
|
||
|
|
change_volume(urb_out, line6pcm->volume_playback,
|
||
|
|
bytes_per_frame);
|
||
|
|
} else {
|
||
|
|
memset(urb_out->transfer_buffer, 0,
|
||
|
|
urb_out->transfer_buffer_length);
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_lock_nested(&line6pcm->in.lock, SINGLE_DEPTH_NESTING);
|
||
|
|
if (line6pcm->prev_fbuf) {
|
||
|
|
if (test_bit(LINE6_STREAM_IMPULSE, &line6pcm->out.running)) {
|
||
|
|
create_impulse_test_signal(line6pcm, urb_out,
|
||
|
|
bytes_per_frame);
|
||
|
|
if (test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) {
|
||
|
|
line6_capture_copy(line6pcm,
|
||
|
|
urb_out->transfer_buffer,
|
||
|
|
urb_out->
|
||
|
|
transfer_buffer_length);
|
||
|
|
line6_capture_check_period(line6pcm,
|
||
|
|
urb_out->transfer_buffer_length);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (!(line6pcm->line6->properties->capabilities & LINE6_CAP_HWMON)
|
||
|
|
&& line6pcm->out.running && line6pcm->in.running)
|
||
|
|
add_monitor_signal(urb_out, line6pcm->prev_fbuf,
|
||
|
|
line6pcm->volume_monitor,
|
||
|
|
bytes_per_frame);
|
||
|
|
}
|
||
|
|
line6pcm->prev_fbuf = NULL;
|
||
|
|
line6pcm->prev_fsize = 0;
|
||
|
|
}
|
||
|
|
spin_unlock(&line6pcm->in.lock);
|
||
|
|
|
||
|
|
ret = usb_submit_urb(urb_out, GFP_ATOMIC);
|
||
|
|
|
||
|
|
if (ret == 0)
|
||
|
|
set_bit(index, &line6pcm->out.active_urbs);
|
||
|
|
else
|
||
|
|
dev_err(line6pcm->line6->ifcdev,
|
||
|
|
"URB out #%d submission failed (%d)\n", index, ret);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Submit all currently available playback URBs.
|
||
|
|
must be called in line6pcm->out.lock context
|
||
|
|
*/
|
||
|
|
int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
|
||
|
|
{
|
||
|
|
int ret = 0, i;
|
||
|
|
|
||
|
|
for (i = 0; i < line6pcm->line6->iso_buffers; ++i) {
|
||
|
|
ret = submit_audio_out_urb(line6pcm);
|
||
|
|
if (ret < 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
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_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
|
||
|
|
struct snd_pcm_substream *substream =
|
||
|
|
get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
|
||
|
|
const int bytes_per_frame =
|
||
|
|
line6pcm->properties->bytes_per_channel *
|
||
|
|
line6pcm->properties->playback_hw.channels_max;
|
||
|
|
|
||
|
|
#if USE_CLEAR_BUFFER_WORKAROUND
|
||
|
|
memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
line6pcm->out.last_frame = urb->start_frame;
|
||
|
|
|
||
|
|
/* find index of URB */
|
||
|
|
for (index = 0; index < line6pcm->line6->iso_buffers; index++)
|
||
|
|
if (urb == line6pcm->out.urbs[index])
|
||
|
|
break;
|
||
|
|
|
||
|
|
if (index >= line6pcm->line6->iso_buffers)
|
||
|
|
return; /* URB has been unlinked asynchronously */
|
||
|
|
|
||
|
|
for (i = 0; i < LINE6_ISO_PACKETS; i++)
|
||
|
|
length += urb->iso_frame_desc[i].length;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&line6pcm->out.lock, flags);
|
||
|
|
|
||
|
|
if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
|
||
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
|
|
||
|
|
line6pcm->out.pos_done +=
|
||
|
|
length / bytes_per_frame;
|
||
|
|
|
||
|
|
if (line6pcm->out.pos_done >= runtime->buffer_size)
|
||
|
|
line6pcm->out.pos_done -= runtime->buffer_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
clear_bit(index, &line6pcm->out.active_urbs);
|
||
|
|
|
||
|
|
for (i = 0; i < LINE6_ISO_PACKETS; i++)
|
||
|
|
if (urb->iso_frame_desc[i].status == -EXDEV) {
|
||
|
|
shutdown = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (test_and_clear_bit(index, &line6pcm->out.unlink_urbs))
|
||
|
|
shutdown = 1;
|
||
|
|
|
||
|
|
if (!shutdown) {
|
||
|
|
submit_audio_out_urb(line6pcm);
|
||
|
|
|
||
|
|
if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
|
||
|
|
line6pcm->out.bytes += length;
|
||
|
|
if (line6pcm->out.bytes >= line6pcm->out.period) {
|
||
|
|
line6pcm->out.bytes %= line6pcm->out.period;
|
||
|
|
spin_unlock(&line6pcm->out.lock);
|
||
|
|
snd_pcm_period_elapsed(substream);
|
||
|
|
spin_lock(&line6pcm->out.lock);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
spin_unlock_irqrestore(&line6pcm->out.lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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->rates);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
runtime->hw = line6pcm->properties->playback_hw;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* close playback callback */
|
||
|
|
static int snd_line6_playback_close(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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_hw_params,
|
||
|
|
.hw_free = snd_line6_hw_free,
|
||
|
|
.prepare = snd_line6_prepare,
|
||
|
|
.trigger = snd_line6_trigger,
|
||
|
|
.pointer = snd_line6_pointer,
|
||
|
|
};
|
||
|
|
|
||
|
|
int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
|
||
|
|
{
|
||
|
|
struct usb_line6 *line6 = line6pcm->line6;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
line6pcm->out.urbs = kzalloc(
|
||
|
|
sizeof(struct urb *) * line6->iso_buffers, GFP_KERNEL);
|
||
|
|
if (line6pcm->out.urbs == NULL)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
/* 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->out.urbs[i] =
|
||
|
|
usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
|
||
|
|
|
||
|
|
if (urb == NULL)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
urb->dev = line6->usbdev;
|
||
|
|
urb->pipe =
|
||
|
|
usb_sndisocpipe(line6->usbdev,
|
||
|
|
line6->properties->ep_audio_w &
|
||
|
|
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;
|
||
|
|
if (usb_urb_ep_type_check(urb))
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|