/*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/ratelimit.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include "usbaudio.h"
#include "helper.h"
#include "card.h"
#include "endpoint.h"
#include "pcm.h"
/*
* convert a sampling rate into our full speed format (fs/1000 in Q16.16)
* this will overflow at approx 524 kHz
*/
static inline unsigned get_usb_full_speed_rate(unsigned int rate)
{
return ((rate << 13) + 62) / 125;
}
/*
* convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
* this will overflow at approx 4 MHz
*/
static inline unsigned get_usb_high_speed_rate(unsigned int rate)
{
return ((rate << 10) + 62) / 125;
}
/*
* unlink active urbs.
*/
static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep)
{
struct snd_usb_audio *chip = subs->stream->chip;
unsigned int i;
int async;
subs->running = 0;
if (!force && subs->stream->chip->shutdown) /* to be sure... */
return -EBADFD;
async = !can_sleep && chip->async_unlink;
if (!async && in_interrupt())
return 0;
for (i = 0; i < subs->nurbs; i++) {
if (test_bit(i, &subs->active_mask)) {
if (!test_and_set_bit(i, &subs->unlink_mask)) {
struct urb *u = subs->dataurb[i].urb;
if (async)
usb_unlink_urb(u);
else
usb_kill_urb(u);
}
}
}
if (subs->syncpipe) {
for (i = 0; i < SYNC_URBS; i++) {
if (test_bit(i+16, &subs->active_mask)) {
if (!test_and_set_bit(i+16, &subs->unlink_mask)) {
struct urb *u = subs->syncurb[i].urb;
if (async)
usb_unlink_urb(u);
else
usb_kill_urb(u);
}
}
}
}
return 0;
}
/*
* release a urb data
*/
static void release_urb_ctx(struct snd_urb_ctx *u)
{
if (u->urb) {
if (u->buffer_size)
usb_free_coherent(u->subs->dev, u->buffer_size,
u->urb->transfer_buffer,
u->urb->transfer_dma);
usb_free_urb(u->urb);
u->urb = NULL;
}
}
/*
* wait until all urbs are processed.
*/
static int wait_clear_urbs(struct snd_usb_substream *subs)
{
unsigned long end_time = jiffies + msecs_to_jiffies(1000);
unsigned int i;
int alive;
do {
alive = 0;
for (i = 0; i < subs->nurbs; i++) {
if (test_bit(i, &subs->active_mask))
alive++;
}
if (subs->syncpipe) {
for (i = 0; i < SYNC_URBS; i++) {
if (test_bit(i + 16, &subs->active_mask))
alive++;
}
}
if (! alive)
break;
schedule_timeout_uninterruptible(1);
} while (time_before(jiffies, end_time));
if (alive)
snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
return 0;
}
/*
* release a substream
*/
void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force)
{
int i;
/* stop urbs (to be sure) */
deactivate_urbs(subs, force, 1);
wait_clear_urbs(subs);
for (i = 0; i < MAX_URBS; i++)
release_urb_ctx(&subs->dataurb[i]);
for (i = 0; i < SYNC_URBS; i++)
release_urb_ctx(&subs->syncurb[i]);
usb_free_coherent(