/*
* Copyright (c) 2013 Federico Simoncelli
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL").
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Fushicai USBTV007 Audio-Video Grabber Driver
*
* Product web site:
* http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
*
* No physical hardware was harmed running Windows during the
* reverse-engineering activity
*/
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/ac97_codec.h>
#include <sound/pcm_params.h>
#include "usbtv.h"
static const struct snd_pcm_hardware snd_usbtv_digital_hw = {
.info = SNDRV_PCM_INFO_BATCH |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_48000,
.rate_min = 48000,
.rate_max = 48000,
.channels_min = 2,
.channels_max = 2,
.period_bytes_min = 11059,
.period_bytes_max = 13516,
.periods_min = 2,
.periods_max = 98,
.buffer_bytes_max = 62720 * 8,
/* value in usbaudio.c */
};
static int snd_usbtv_pcm_open(
struct snd_pcm_substream *substream)
{
struct usbtv *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
chip->snd_substream = substream;
runtime->hw = snd_usbtv_digital_hw;
return 0;
}
static int snd_usbtv_pcm_close(
struct snd_pcm_substream *substream)
{
struct usbtv *chip = snd_pcm_substream_chip(substream);
if (atomic_read(&chip->snd_stream)) {
atomic_set(&chip->snd_stream, 0);
schedule_work(&chip->snd_trigger);
}
return 0;
}
static int snd_usbtv_prepare(
struct snd_pcm_substream *substream)
{
struct usbtv *chip = snd_pcm_substream_chip(substream);
chip->snd_buffer_pos = 0;
chip->snd_period_pos = 0;
return 0;
}
static void usbtv_audio_urb_received(
struct urb *urb)
{
struct usbtv *chip = urb->context;
struct snd_pcm_substream *substream = chip->snd_substream;
struct snd_pcm_runtime *runtime = substream->runtime;
size_t i, frame_bytes, chunk_length, buffer_pos, period_pos;
int period_elapsed;
unsigned long flags;
void *urb_current;
switch (urb->status) {
case 0:
case -ETIMEDOUT:
break;
case -ENOENT:
case -EPROTO:
case -ECONNRESET:
case -ESHUTDOWN:
return;
default:
dev_warn(chip->dev,
"unknown audio urb status %i\n",
urb->status);
}
if (!atomic_read(&chip->snd_stream))
return;
frame_bytes = runtime->frame_bits >> 3;
chunk_length = USBTV_CHUNK / frame_bytes;
buffer_pos = chip->snd_buffer_pos;
period_pos = chip->snd_period_pos;
period_elapsed = 0;
for (i = 0; i < urb->actual_length; i += USBTV_CHUNK_SIZE) {
urb_current = urb->transfer_buffer + i + USBTV_AUDIO_HDRSIZE;
if (buffer_pos + chunk_length >= runtime->buffer_size) {
size_t cnt = (runtime->buffer_size - buffer_pos) *
frame_bytes;
memcpy(runtime->dma_area + buffer_pos * frame_bytes,
urb_current, cnt);
memcpy(runtime->dma_area, urb_current + cnt,
chunk_length * frame_bytes - cnt);
}
else {
memcpy(runtime->dma_area + buffer_pos * frame_bytes,
urb_current, chunk_length * frame_bytes);
}
buffer_pos += chunk_length;
period_pos += chunk_length;
if (buffer_pos >= runtime->buffer_size)
buffer_pos -= runtime->buffer_size;
if (period_pos >= runtime->period_size) {
period_pos -= runtime->period_size;
period_elapsed = 1;
}
}
snd_pcm_stream_lock_irqsave(substream, flags);
chip->snd_buffer_pos = buffer_pos;
chip->snd_period_pos = period_pos;
snd_pcm_stream_unlock_irqrestore(substream, flags);
if (period_elapsed)
snd_pcm_period_elapsed(substream);
usb_submit_urb(urb, GFP_ATOMIC);
}
static int usbtv_audio_start(
struct usbtv *chip)
{
unsigned int pipe;
static const u16 setup[][2] = {
/* These seem to enable the device. */
{ USBTV_BASE + 0x0008, 0x0001 },
{ USBTV_BASE + 0x01d0, 0x00ff },
{ USBTV_BASE + 0x01d9, 0x0002 },
{ USBTV_BASE + 0x01da, 0x0013 },
{ USBTV_BASE + 0x01db, 0x0012 },
{ USBTV_BASE + 0x01e9, 0x0002 },
{ USBTV_BASE + 0x01ec, 0x006c },
{ USBTV_BASE + 0x0294, 0x0020 },
{ USBTV_BASE + 0x0255, 0x00cf },
{ USBTV_BASE + 0x0256, 0x0020 },
{ USBTV_BASE + 0x01eb, 0x0030 },
{ USBTV_BASE + 0x027d, 0x00a6 },
{ USBTV_BASE + 0x0280, 0x0011 },
{ USBTV_BASE + 0x0281, 0x0040 },
{ USBTV_BASE + 0x0282, 0x0011 },
{ USBTV_BASE + 0x0283, 0x0040 },
{ 0xf891, 0x0010 },
/* this sets the input from composite */
{ USBTV_BASE + 0x0284, 0x00aa },
};
chip->snd_bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
if (chip->snd_bulk_urb == NULL)
goto err_alloc_urb;
pipe = usb_rcvbulkpipe(chip->udev, USBTV_AUDIO_ENDP);
chip->snd_bulk_urb->transfer_buffer = kzalloc(
USBTV_AUDIO_URBSIZE, GFP_KERNEL);
if (chip->snd_bulk_urb->transfer_buffer == NULL)
goto err_transfer_buffer;
usb_fill_bulk_urb(chip->snd_bulk_urb, chip->udev, pipe,
chip->snd_bulk_urb->transfer_buffer, USBTV_AUDIO_URBSIZE,
usbtv_audio_urb_received, chip);
/* starting the stream */
usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));
usb_clear_halt(chip->udev, pipe);
usb_submit_urb(chip->snd_bulk_urb, GFP_ATOMIC);
return 0;
err_transfer_buffer:
usb_free_urb(chip->snd_bulk_urb);
chip->snd_bulk_urb = NULL;
err_alloc_urb:
return -ENOMEM;
}
static int usbtv_audio_stop(
struct usbtv *chip)
{
static const u16 setup[][2] = {
/* The original windows driver sometimes sends also:
* { USBTV_BASE + 0x00a2, 0x0013 }
* but it seems useless and its real effects are untested at
* the moment.
*/
{ USBTV_BASE + 0x027d, 0x0000 },
{ USBTV_BASE + 0x0280, 0x0010 },
{ USBTV_BASE + 0x0282, 0x0010 },
};
if (chip->snd_bulk_urb) {
usb_kill_urb(chip->snd_bulk_urb);
kfree(chip->snd_bulk_urb->transfer_buffer);
usb_free_urb(chip->snd_bulk_urb);
chip->snd_bulk_urb = NULL;
}
usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));
return 0;
}
void usbtv_audio_suspend(
struct usbtv *usbtv)
{
if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)
usb_kill_urb(usbtv->snd_bulk_urb);
}
void usbtv_audio_resume(
struct usbtv *usbtv)
{
if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)
usb_submit_urb(usbtv->snd_bulk_urb, GFP_ATOMIC);
}
static void snd_usbtv_trigger(
struct work_struct *work)
{
struct usbtv *chip = container_of(work,
struct usbtv, snd_trigger);
if (!chip->snd)
return;
if (atomic_read(&chip->snd_stream))
usbtv_audio_start(chip);
else
usbtv_audio_stop(chip);
}
static int snd_usbtv_card_trigger(
struct snd_pcm_substream *substream,
int cmd)
{
struct usbtv *chip = snd_pcm_substream_chip(substream);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
atomic_set(&chip->snd_stream, 1);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
atomic_set(&chip->snd_stream, 0);
break;
default:
return -EINVAL;
}
schedule_work(&chip->snd_trigger);
return 0;
}
static snd_pcm_uframes_t snd_usbtv_pointer(
struct snd_pcm_substream *substream)
{
struct usbtv *chip = snd_pcm_substream_chip(substream);
return chip->snd_buffer_pos;
}
static const struct snd_pcm_ops snd_usbtv_pcm_ops = {
.open = snd_usbtv_pcm_open,
.close = snd_usbtv_pcm_close,
.prepare = snd_usbtv_prepare,
.trigger = snd_usbtv_card_trigger,
.pointer = snd_usbtv_pointer,
};
int usbtv_audio_init(
struct usbtv *usbtv)
{
int rv;
struct snd_card *card;
struct snd_pcm *pcm;
INIT_WORK(&usbtv->snd_trigger, snd_usbtv_trigger);
atomic_set(&usbtv->snd_stream, 0);
rv = snd_card_new(&usbtv->udev->dev, SNDRV_DEFAULT_IDX1,
"usbtv",
THIS_MODULE, 0, &card);
if (rv < 0)
return rv;
strscpy(card->driver, usbtv->dev->driver->name,
sizeof(card->driver));
strscpy(card->shortname,
"usbtv",
sizeof(card->shortname));
snprintf(card->longname,
sizeof(card->longname),
"USBTV Audio at bus %d device %d", usbtv->udev->bus->busnum,
usbtv->udev->devnum);
snd_card_set_dev(card, usbtv->dev);
usbtv->snd = card;
rv = snd_pcm_new(card,
"USBTV Audio", 0, 0, 1, &pcm);
if (rv < 0)
goto err;
strscpy(pcm->name,
"USBTV Audio Input",
sizeof(pcm->name));
pcm->info_flags = 0;
pcm->private_data = usbtv;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usbtv_pcm_ops);
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
NULL, USBTV_AUDIO_BUFFER, USBTV_AUDIO_BUFFER);
rv = snd_card_register(card);
if (rv)
goto err;
return 0;
err:
usbtv->snd = NULL;
snd_card_free(card);
return rv;
}
void usbtv_audio_free(
struct usbtv *usbtv)
{
cancel_work_sync(&usbtv->snd_trigger);
if (usbtv->snd && usbtv->udev) {
snd_card_free_when_closed(usbtv->snd);
usbtv->snd = NULL;
}
}
