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