blob: ca092247f363602bdbf62c227223f42928ac27ee [file] [log] [blame]
/*
* 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 <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "audio.h"
#include "pcm.h"
#include "pod.h"
#include "capture.h"
/*
Find a free URB and submit it.
*/
static int submit_audio_in_urb(struct snd_pcm_substream *substream)
{
unsigned int index;
unsigned long flags;
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
int i, urb_size;
struct urb *urb_in;
spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
index =
find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
if (index >= LINE6_ISO_BUFFERS) {
spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
dev_err(s2m(substream), "no free URB found\n");
return -EINVAL;
}
urb_in = line6pcm->urb_audio_in[index];
urb_size = 0;
for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
struct usb_iso_packet_descriptor *fin =
&urb_in->iso_frame_desc[i];
fin->offset = urb_size;
fin->length = line6pcm->max_packet_size;
urb_size += line6pcm->max_packet_size;
}
urb_in->transfer_buffer =
line6pcm->buffer_in +
index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
urb_in->transfer_buffer_length = urb_size;
urb_in->context = substream;
if (usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
set_bit(index, &line6pcm->active_urb_in);
else
dev_err(s2m(substream), "URB in #%d submission failed\n",
index);
spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
return 0;
}
/*
Submit all currently available capture URBs.
*/
static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
{
int ret, i;
for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
ret = submit_audio_in_urb(substream);
if (ret < 0)
return ret;
}
return 0;
}
/*
Unlink all currently active capture URBs.
*/
static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
{
unsigned int i;
for (i = LINE6_ISO_BUFFERS; i--;) {
if (test_bit(i, &line6pcm->active_urb_in)) {
if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
struct urb *u = line6pcm->urb_audio_in[i];
usb_unlink_urb(u);
}
}
}
}
/*
Wait until unlinking of all currently active capture URBs has been
finished.
*/
static void wait_clear_audio_in_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_in))
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_in = 0;
line6pcm->unlink_urb_in = 0;
}
/*
Unlink all currently active capture URBs, and wait for finishing.
*/
void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
{
unlink_audio_in_urbs(line6pcm);
wait_clear_audio_in_urbs(line6pcm);
}
/*
Callback for completed capture URB.
*/
static void audio_in_callback(struct urb *urb)
{
int i, index, length = 0, shutdown = 0;
int frames;
unsigned long flags;
struct snd_pcm_substream *substream =
(struct snd_pcm_substream *)urb->context;
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
struct snd_pcm_runtime *runtime = substream->runtime;
/* find index of URB */
for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
if (urb == line6pcm->urb_audio_in[index])
break;
#if DO_DUMP_PCM_RECEIVE
for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
struct usb_iso_packet_descriptor *fout =
&urb->iso_frame_desc[i];
line6_write_hexdump(line6pcm->line6, 'C',
urb->transfer_buffer + fout->offset,
fout->length);
}
#endif
spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
char *fbuf;
int fsize;
struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
if (fin->status == -18) {
shutdown = 1;
break;
}
fbuf = urb->transfer_buffer + fin->offset;
fsize = fin->actual_length;
length += fsize;
if (fsize > 0) {
frames = fsize / bytes_per_frame;
if (line6pcm->pos_in_done + frames >
runtime->buffer_size) {
/*
The transferred area goes over buffer
boundary, copy two separate chunks.
*/
int len;
len =
runtime->buffer_size -
line6pcm->pos_in_done;
if (len > 0) {
memcpy(runtime->dma_area +
line6pcm->pos_in_done *
bytes_per_frame, fbuf,
len * bytes_per_frame);
memcpy(runtime->dma_area,
fbuf + len * bytes_per_frame,
(frames -
len) * bytes_per_frame);
} else {
/* this is somewhat paranoid */
dev_err(s2m(substream),
"driver bug: len = %d\n", len);
}
} else {
/* copy single chunk */
memcpy(runtime->dma_area +
line6pcm->pos_in_done * bytes_per_frame,
fbuf, fsize * bytes_per_frame);
}
line6pcm->pos_in_done += frames;
if (line6pcm->pos_in_done >= runtime->buffer_size)
line6pcm->pos_in_done -= runtime->buffer_size;
}
}
clear_bit(index, &line6pcm->active_urb_in);
if (test_bit(index, &line6pcm->unlink_urb_in))
shutdown = 1;
spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
if (!shutdown) {
submit_audio_in_urb(substream);
line6pcm->bytes_in += length;
if (line6pcm->bytes_in >= line6pcm->period_in) {
line6pcm->bytes_in -= line6pcm->period_in;
snd_pcm_period_elapsed(substream);
}
}
}
/* open capture callback */
static int snd_line6_capture_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_capture_hw;
return 0;
}
/* close capture callback */
static int snd_line6_capture_close(struct snd_pcm_substream *substream)
{
return 0;
}
/* hw_params capture callback */
static int snd_line6_capture_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_in = params_period_bytes(hw_params);
line6pcm->buffer_in =
kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
if (!line6pcm->buffer_in) {
dev_err(s2m(substream), "cannot malloc buffer_in\n");
return -ENOMEM;
}
return 0;
}
/* hw_free capture callback */
static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
{
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
unlink_wait_clear_audio_in_urbs(line6pcm);
kfree(line6pcm->buffer_in);
line6pcm->buffer_in = NULL;
return snd_pcm_lib_free_pages(substream);
}
/* trigger callback */
int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
int err;
line6pcm->count_in = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
if (!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
err = submit_audio_in_all_urbs(substream);
if (err < 0) {
clear_bit(BIT_RUNNING_CAPTURE,
&line6pcm->flags);
return err;
}
}
break;
case SNDRV_PCM_TRIGGER_STOP:
if (test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
unlink_audio_in_urbs(line6pcm);
break;
default:
return -EINVAL;
}
return 0;
}
/* capture pointer callback */
static snd_pcm_uframes_t
snd_line6_capture_pointer(struct snd_pcm_substream *substream)
{
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
return line6pcm->pos_in_done;
}
/* capture operators */
struct snd_pcm_ops snd_line6_capture_ops = {
.open = snd_line6_capture_open,
.close = snd_line6_capture_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_line6_capture_hw_params,
.hw_free = snd_line6_capture_hw_free,
.prepare = snd_line6_prepare,
.trigger = snd_line6_trigger,
.pointer = snd_line6_capture_pointer,
};
int create_audio_in_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 in: */
urb = line6pcm->urb_audio_in[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_rcvisocpipe(line6pcm->line6->usbdev,
line6pcm->
ep_audio_read & 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_in_callback;
}
return 0;
}