378 lines · c
1/*2 * Copyright (c) 2013 Federico Simoncelli3 * All rights reserved.4 *5 * Redistribution and use in source and binary forms, with or without6 * modification, are permitted provided that the following conditions7 * are met:8 * 1. Redistributions of source code must retain the above copyright9 * notice, this list of conditions, and the following disclaimer,10 * without modification.11 * 2. The name of the author may not be used to endorse or promote products12 * derived from this software without specific prior written permission.13 *14 * Alternatively, this software may be distributed under the terms of the15 * GNU General Public License ("GPL").16 *17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.28 */29/*30 * Fushicai USBTV007 Audio-Video Grabber Driver31 *32 * Product web site:33 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html34 *35 * No physical hardware was harmed running Windows during the36 * reverse-engineering activity37 */38 39#include <sound/core.h>40#include <sound/initval.h>41#include <sound/ac97_codec.h>42#include <sound/pcm_params.h>43 44#include "usbtv.h"45 46static const struct snd_pcm_hardware snd_usbtv_digital_hw = {47 .info = SNDRV_PCM_INFO_BATCH |48 SNDRV_PCM_INFO_MMAP |49 SNDRV_PCM_INFO_INTERLEAVED |50 SNDRV_PCM_INFO_BLOCK_TRANSFER |51 SNDRV_PCM_INFO_MMAP_VALID,52 .formats = SNDRV_PCM_FMTBIT_S16_LE,53 .rates = SNDRV_PCM_RATE_48000,54 .rate_min = 48000,55 .rate_max = 48000,56 .channels_min = 2,57 .channels_max = 2,58 .period_bytes_min = 11059,59 .period_bytes_max = 13516,60 .periods_min = 2,61 .periods_max = 98,62 .buffer_bytes_max = 62720 * 8, /* value in usbaudio.c */63};64 65static int snd_usbtv_pcm_open(struct snd_pcm_substream *substream)66{67 struct usbtv *chip = snd_pcm_substream_chip(substream);68 struct snd_pcm_runtime *runtime = substream->runtime;69 70 chip->snd_substream = substream;71 runtime->hw = snd_usbtv_digital_hw;72 73 return 0;74}75 76static int snd_usbtv_pcm_close(struct snd_pcm_substream *substream)77{78 struct usbtv *chip = snd_pcm_substream_chip(substream);79 80 if (atomic_read(&chip->snd_stream)) {81 atomic_set(&chip->snd_stream, 0);82 schedule_work(&chip->snd_trigger);83 }84 85 return 0;86}87 88static int snd_usbtv_prepare(struct snd_pcm_substream *substream)89{90 struct usbtv *chip = snd_pcm_substream_chip(substream);91 92 chip->snd_buffer_pos = 0;93 chip->snd_period_pos = 0;94 95 return 0;96}97 98static void usbtv_audio_urb_received(struct urb *urb)99{100 struct usbtv *chip = urb->context;101 struct snd_pcm_substream *substream = chip->snd_substream;102 struct snd_pcm_runtime *runtime = substream->runtime;103 size_t i, frame_bytes, chunk_length, buffer_pos, period_pos;104 int period_elapsed;105 unsigned long flags;106 void *urb_current;107 108 switch (urb->status) {109 case 0:110 case -ETIMEDOUT:111 break;112 case -ENOENT:113 case -EPROTO:114 case -ECONNRESET:115 case -ESHUTDOWN:116 return;117 default:118 dev_warn(chip->dev, "unknown audio urb status %i\n",119 urb->status);120 }121 122 if (!atomic_read(&chip->snd_stream))123 return;124 125 frame_bytes = runtime->frame_bits >> 3;126 chunk_length = USBTV_CHUNK / frame_bytes;127 128 buffer_pos = chip->snd_buffer_pos;129 period_pos = chip->snd_period_pos;130 period_elapsed = 0;131 132 for (i = 0; i < urb->actual_length; i += USBTV_CHUNK_SIZE) {133 urb_current = urb->transfer_buffer + i + USBTV_AUDIO_HDRSIZE;134 135 if (buffer_pos + chunk_length >= runtime->buffer_size) {136 size_t cnt = (runtime->buffer_size - buffer_pos) *137 frame_bytes;138 memcpy(runtime->dma_area + buffer_pos * frame_bytes,139 urb_current, cnt);140 memcpy(runtime->dma_area, urb_current + cnt,141 chunk_length * frame_bytes - cnt);142 } else {143 memcpy(runtime->dma_area + buffer_pos * frame_bytes,144 urb_current, chunk_length * frame_bytes);145 }146 147 buffer_pos += chunk_length;148 period_pos += chunk_length;149 150 if (buffer_pos >= runtime->buffer_size)151 buffer_pos -= runtime->buffer_size;152 153 if (period_pos >= runtime->period_size) {154 period_pos -= runtime->period_size;155 period_elapsed = 1;156 }157 }158 159 snd_pcm_stream_lock_irqsave(substream, flags);160 161 chip->snd_buffer_pos = buffer_pos;162 chip->snd_period_pos = period_pos;163 164 snd_pcm_stream_unlock_irqrestore(substream, flags);165 166 if (period_elapsed)167 snd_pcm_period_elapsed(substream);168 169 usb_submit_urb(urb, GFP_ATOMIC);170}171 172static int usbtv_audio_start(struct usbtv *chip)173{174 unsigned int pipe;175 static const u16 setup[][2] = {176 /* These seem to enable the device. */177 { USBTV_BASE + 0x0008, 0x0001 },178 { USBTV_BASE + 0x01d0, 0x00ff },179 { USBTV_BASE + 0x01d9, 0x0002 },180 181 { USBTV_BASE + 0x01da, 0x0013 },182 { USBTV_BASE + 0x01db, 0x0012 },183 { USBTV_BASE + 0x01e9, 0x0002 },184 { USBTV_BASE + 0x01ec, 0x006c },185 { USBTV_BASE + 0x0294, 0x0020 },186 { USBTV_BASE + 0x0255, 0x00cf },187 { USBTV_BASE + 0x0256, 0x0020 },188 { USBTV_BASE + 0x01eb, 0x0030 },189 { USBTV_BASE + 0x027d, 0x00a6 },190 { USBTV_BASE + 0x0280, 0x0011 },191 { USBTV_BASE + 0x0281, 0x0040 },192 { USBTV_BASE + 0x0282, 0x0011 },193 { USBTV_BASE + 0x0283, 0x0040 },194 { 0xf891, 0x0010 },195 196 /* this sets the input from composite */197 { USBTV_BASE + 0x0284, 0x00aa },198 };199 200 chip->snd_bulk_urb = usb_alloc_urb(0, GFP_KERNEL);201 if (chip->snd_bulk_urb == NULL)202 goto err_alloc_urb;203 204 pipe = usb_rcvbulkpipe(chip->udev, USBTV_AUDIO_ENDP);205 206 chip->snd_bulk_urb->transfer_buffer = kzalloc(207 USBTV_AUDIO_URBSIZE, GFP_KERNEL);208 if (chip->snd_bulk_urb->transfer_buffer == NULL)209 goto err_transfer_buffer;210 211 usb_fill_bulk_urb(chip->snd_bulk_urb, chip->udev, pipe,212 chip->snd_bulk_urb->transfer_buffer, USBTV_AUDIO_URBSIZE,213 usbtv_audio_urb_received, chip);214 215 /* starting the stream */216 usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));217 218 usb_clear_halt(chip->udev, pipe);219 usb_submit_urb(chip->snd_bulk_urb, GFP_ATOMIC);220 221 return 0;222 223err_transfer_buffer:224 usb_free_urb(chip->snd_bulk_urb);225 chip->snd_bulk_urb = NULL;226 227err_alloc_urb:228 return -ENOMEM;229}230 231static int usbtv_audio_stop(struct usbtv *chip)232{233 static const u16 setup[][2] = {234 /* The original windows driver sometimes sends also:235 * { USBTV_BASE + 0x00a2, 0x0013 }236 * but it seems useless and its real effects are untested at237 * the moment.238 */239 { USBTV_BASE + 0x027d, 0x0000 },240 { USBTV_BASE + 0x0280, 0x0010 },241 { USBTV_BASE + 0x0282, 0x0010 },242 };243 244 if (chip->snd_bulk_urb) {245 usb_kill_urb(chip->snd_bulk_urb);246 kfree(chip->snd_bulk_urb->transfer_buffer);247 usb_free_urb(chip->snd_bulk_urb);248 chip->snd_bulk_urb = NULL;249 }250 251 usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));252 253 return 0;254}255 256void usbtv_audio_suspend(struct usbtv *usbtv)257{258 if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)259 usb_kill_urb(usbtv->snd_bulk_urb);260}261 262void usbtv_audio_resume(struct usbtv *usbtv)263{264 if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)265 usb_submit_urb(usbtv->snd_bulk_urb, GFP_ATOMIC);266}267 268static void snd_usbtv_trigger(struct work_struct *work)269{270 struct usbtv *chip = container_of(work, struct usbtv, snd_trigger);271 272 if (!chip->snd)273 return;274 275 if (atomic_read(&chip->snd_stream))276 usbtv_audio_start(chip);277 else278 usbtv_audio_stop(chip);279}280 281static int snd_usbtv_card_trigger(struct snd_pcm_substream *substream, int cmd)282{283 struct usbtv *chip = snd_pcm_substream_chip(substream);284 285 switch (cmd) {286 case SNDRV_PCM_TRIGGER_START:287 case SNDRV_PCM_TRIGGER_RESUME:288 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:289 atomic_set(&chip->snd_stream, 1);290 break;291 case SNDRV_PCM_TRIGGER_STOP:292 case SNDRV_PCM_TRIGGER_SUSPEND:293 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:294 atomic_set(&chip->snd_stream, 0);295 break;296 default:297 return -EINVAL;298 }299 300 schedule_work(&chip->snd_trigger);301 302 return 0;303}304 305static snd_pcm_uframes_t snd_usbtv_pointer(struct snd_pcm_substream *substream)306{307 struct usbtv *chip = snd_pcm_substream_chip(substream);308 309 return chip->snd_buffer_pos;310}311 312static const struct snd_pcm_ops snd_usbtv_pcm_ops = {313 .open = snd_usbtv_pcm_open,314 .close = snd_usbtv_pcm_close,315 .prepare = snd_usbtv_prepare,316 .trigger = snd_usbtv_card_trigger,317 .pointer = snd_usbtv_pointer,318};319 320int usbtv_audio_init(struct usbtv *usbtv)321{322 int rv;323 struct snd_card *card;324 struct snd_pcm *pcm;325 326 INIT_WORK(&usbtv->snd_trigger, snd_usbtv_trigger);327 atomic_set(&usbtv->snd_stream, 0);328 329 rv = snd_card_new(&usbtv->udev->dev, SNDRV_DEFAULT_IDX1, "usbtv",330 THIS_MODULE, 0, &card);331 if (rv < 0)332 return rv;333 334 strscpy(card->driver, usbtv->dev->driver->name, sizeof(card->driver));335 strscpy(card->shortname, "usbtv", sizeof(card->shortname));336 snprintf(card->longname, sizeof(card->longname),337 "USBTV Audio at bus %d device %d", usbtv->udev->bus->busnum,338 usbtv->udev->devnum);339 340 snd_card_set_dev(card, usbtv->dev);341 342 usbtv->snd = card;343 344 rv = snd_pcm_new(card, "USBTV Audio", 0, 0, 1, &pcm);345 if (rv < 0)346 goto err;347 348 strscpy(pcm->name, "USBTV Audio Input", sizeof(pcm->name));349 pcm->info_flags = 0;350 pcm->private_data = usbtv;351 352 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usbtv_pcm_ops);353 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,354 NULL, USBTV_AUDIO_BUFFER, USBTV_AUDIO_BUFFER);355 356 rv = snd_card_register(card);357 if (rv)358 goto err;359 360 return 0;361 362err:363 usbtv->snd = NULL;364 snd_card_free(card);365 366 return rv;367}368 369void usbtv_audio_free(struct usbtv *usbtv)370{371 cancel_work_sync(&usbtv->snd_trigger);372 373 if (usbtv->snd && usbtv->udev) {374 snd_card_free_when_closed(usbtv->snd);375 usbtv->snd = NULL;376 }377}378