1/* 2 * Empiatech em28x1 audio extension 3 * 4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> 5 * 6 * Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org> 7 * - Port to work with the in-kernel driver 8 * - Several cleanups 9 * 10 * This driver is based on my previous au600 usb pstn audio driver 11 * and inherits all the copyrights 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28#include <linux/kernel.h> 29#include <linux/usb.h> 30#include <linux/init.h> 31#include <linux/sound.h> 32#include <linux/spinlock.h> 33#include <linux/soundcard.h> 34#include <linux/slab.h> 35#include <linux/vmalloc.h> 36#include <linux/proc_fs.h> 37#include <linux/module.h> 38#include <sound/core.h> 39#include <sound/pcm.h> 40#include <sound/pcm_params.h> 41#include <sound/info.h> 42#include <sound/initval.h> 43#include <sound/control.h> 44#include <media/v4l2-common.h> 45#include "em28xx.h" 46 47static int debug; 48module_param(debug, int, 0644); 49MODULE_PARM_DESC(debug, "activates debug info"); 50 51#define dprintk(fmt, arg...) do { \ 52 if (debug) \ 53 printk(KERN_INFO "em28xx-audio %s: " fmt, \ 54 __func__, ##arg); \ 55 } while (0) 56 57static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 58 59static int em28xx_deinit_isoc_audio(struct em28xx *dev) 60{ 61 int i; 62 63 dprintk("Stopping isoc\n"); 64 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { 65 if (!irqs_disabled()) 66 usb_kill_urb(dev->adev.urb[i]); 67 else 68 usb_unlink_urb(dev->adev.urb[i]); 69 70 usb_free_urb(dev->adev.urb[i]); 71 dev->adev.urb[i] = NULL; 72 73 kfree(dev->adev.transfer_buffer[i]); 74 dev->adev.transfer_buffer[i] = NULL; 75 } 76 77 return 0; 78} 79 80static void em28xx_audio_isocirq(struct urb *urb) 81{ 82 struct em28xx *dev = urb->context; 83 int i; 84 unsigned int oldptr; 85 int period_elapsed = 0; 86 int status; 87 unsigned char *cp; 88 unsigned int stride; 89 struct snd_pcm_substream *substream; 90 struct snd_pcm_runtime *runtime; 91 92 switch (urb->status) { 93 case 0: /* success */ 94 case -ETIMEDOUT: /* NAK */ 95 break; 96 case -ECONNRESET: /* kill */ 97 case -ENOENT: 98 case -ESHUTDOWN: 99 return; 100 default: /* error */ 101 dprintk("urb completition error %d.\n", urb->status); 102 break; 103 } 104 105 if (dev->adev.capture_pcm_substream) { 106 substream = dev->adev.capture_pcm_substream; 107 runtime = substream->runtime; 108 stride = runtime->frame_bits >> 3; 109 110 for (i = 0; i < urb->number_of_packets; i++) { 111 int length = 112 urb->iso_frame_desc[i].actual_length / stride; 113 cp = (unsigned char *)urb->transfer_buffer + 114 urb->iso_frame_desc[i].offset; 115 116 if (!length) 117 continue; 118 119 oldptr = dev->adev.hwptr_done_capture; 120 if (oldptr + length >= runtime->buffer_size) { 121 unsigned int cnt = 122 runtime->buffer_size - oldptr; 123 memcpy(runtime->dma_area + oldptr * stride, cp, 124 cnt * stride); 125 memcpy(runtime->dma_area, cp + cnt * stride, 126 length * stride - cnt * stride); 127 } else { 128 memcpy(runtime->dma_area + oldptr * stride, cp, 129 length * stride); 130 } 131 132 snd_pcm_stream_lock(substream); 133 134 dev->adev.hwptr_done_capture += length; 135 if (dev->adev.hwptr_done_capture >= 136 runtime->buffer_size) 137 dev->adev.hwptr_done_capture -= 138 runtime->buffer_size; 139 140 dev->adev.capture_transfer_done += length; 141 if (dev->adev.capture_transfer_done >= 142 runtime->period_size) { 143 dev->adev.capture_transfer_done -= 144 runtime->period_size; 145 period_elapsed = 1; 146 } 147 148 snd_pcm_stream_unlock(substream); 149 } 150 if (period_elapsed) 151 snd_pcm_period_elapsed(substream); 152 } 153 urb->status = 0; 154 155 status = usb_submit_urb(urb, GFP_ATOMIC); 156 if (status < 0) { 157 em28xx_errdev("resubmit of audio urb failed (error=%i)\n", 158 status); 159 } 160 return; 161} 162 163static int em28xx_init_audio_isoc(struct em28xx *dev) 164{ 165 int i, errCode; 166 const int sb_size = EM28XX_NUM_AUDIO_PACKETS * 167 EM28XX_AUDIO_MAX_PACKET_SIZE; 168 169 dprintk("Starting isoc transfers\n"); 170 171 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { 172 struct urb *urb; 173 int j, k; 174 175 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 176 if (!dev->adev.transfer_buffer[i]) 177 return -ENOMEM; 178 179 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 180 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); 181 if (!urb) { 182 em28xx_errdev("usb_alloc_urb failed!\n"); 183 for (j = 0; j < i; j++) { 184 usb_free_urb(dev->adev.urb[j]); 185 kfree(dev->adev.transfer_buffer[j]); 186 } 187 return -ENOMEM; 188 } 189 190 urb->dev = dev->udev; 191 urb->context = dev; 192 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83); 193 urb->transfer_flags = URB_ISO_ASAP; 194 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 195 urb->interval = 1; 196 urb->complete = em28xx_audio_isocirq; 197 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS; 198 urb->transfer_buffer_length = sb_size; 199 200 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS; 201 j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) { 202 urb->iso_frame_desc[j].offset = k; 203 urb->iso_frame_desc[j].length = 204 EM28XX_AUDIO_MAX_PACKET_SIZE; 205 } 206 dev->adev.urb[i] = urb; 207 } 208 209 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { 210 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 211 if (errCode) { 212 em28xx_deinit_isoc_audio(dev); 213 return errCode; 214 } 215 } 216 217 return 0; 218} 219 220static int em28xx_cmd(struct em28xx *dev, int cmd, int arg) 221{ 222 dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ? 223 "stop" : "start"); 224 225 switch (cmd) { 226 case EM28XX_CAPTURE_STREAM_EN: 227 if (dev->adev.capture_stream == STREAM_OFF && 228 arg == EM28XX_START_AUDIO) { 229 dev->adev.capture_stream = STREAM_ON; 230 em28xx_init_audio_isoc(dev); 231 } else if (dev->adev.capture_stream == STREAM_ON && 232 arg == EM28XX_STOP_AUDIO) { 233 dev->adev.capture_stream = STREAM_OFF; 234 em28xx_deinit_isoc_audio(dev); 235 } else { 236 em28xx_errdev("An underrun very likely occurred. " 237 "Ignoring it.\n"); 238 } 239 return 0; 240 default: 241 return -EINVAL; 242 } 243} 244 245static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 246 size_t size) 247{ 248 struct snd_pcm_runtime *runtime = subs->runtime; 249 250 dprintk("Allocating vbuffer\n"); 251 if (runtime->dma_area) { 252 if (runtime->dma_bytes > size) 253 return 0; 254 255 vfree(runtime->dma_area); 256 } 257 runtime->dma_area = vmalloc(size); 258 if (!runtime->dma_area) 259 return -ENOMEM; 260 261 runtime->dma_bytes = size; 262 263 return 0; 264} 265 266static struct snd_pcm_hardware snd_em28xx_hw_capture = { 267 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 268 SNDRV_PCM_INFO_MMAP | 269 SNDRV_PCM_INFO_INTERLEAVED | 270 SNDRV_PCM_INFO_MMAP_VALID, 271 272 .formats = SNDRV_PCM_FMTBIT_S16_LE, 273 274 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, 275 276 .rate_min = 48000, 277 .rate_max = 48000, 278 .channels_min = 2, 279 .channels_max = 2, 280 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 281 .period_bytes_min = 64, /* 12544/2, */ 282 .period_bytes_max = 12544, 283 .periods_min = 2, 284 .periods_max = 98, /* 12544, */ 285}; 286 287static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) 288{ 289 struct em28xx *dev = snd_pcm_substream_chip(substream); 290 struct snd_pcm_runtime *runtime = substream->runtime; 291 int ret = 0; 292 293 dprintk("opening device and trying to acquire exclusive lock\n"); 294 295 if (!dev) { 296 em28xx_err("BUG: em28xx can't find device struct." 297 " Can't proceed with open\n"); 298 return -ENODEV; 299 } 300 301 /* Sets volume, mute, etc */ 302 303 dev->mute = 0; 304 mutex_lock(&dev->lock); 305 ret = em28xx_audio_analog_set(dev); 306 mutex_unlock(&dev->lock); 307 if (ret < 0) 308 goto err; 309 310 runtime->hw = snd_em28xx_hw_capture; 311 if (dev->alt == 0 && dev->adev.users == 0) { 312 int errCode; 313 dev->alt = 7; 314 errCode = usb_set_interface(dev->udev, 0, 7); 315 dprintk("changing alternate number to 7\n"); 316 } 317 318 mutex_lock(&dev->lock); 319 dev->adev.users++; 320 mutex_unlock(&dev->lock); 321 322 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 323 dev->adev.capture_pcm_substream = substream; 324 runtime->private_data = dev; 325 326 return 0; 327err: 328 em28xx_err("Error while configuring em28xx mixer\n"); 329 return ret; 330} 331 332static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) 333{ 334 struct em28xx *dev = snd_pcm_substream_chip(substream); 335 336 dprintk("closing device\n"); 337 338 dev->mute = 1; 339 mutex_lock(&dev->lock); 340 dev->adev.users--; 341 em28xx_audio_analog_set(dev); 342 if (substream->runtime->dma_area) { 343 dprintk("freeing\n"); 344 vfree(substream->runtime->dma_area); 345 substream->runtime->dma_area = NULL; 346 } 347 mutex_unlock(&dev->lock); 348 349 return 0; 350} 351 352static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, 353 struct snd_pcm_hw_params *hw_params) 354{ 355 unsigned int channels, rate, format; 356 int ret; 357 358 dprintk("Setting capture parameters\n"); 359 360 ret = snd_pcm_alloc_vmalloc_buffer(substream, 361 params_buffer_bytes(hw_params)); 362 format = params_format(hw_params); 363 rate = params_rate(hw_params); 364 channels = params_channels(hw_params); 365 366 /* TODO: set up em28xx audio chip to deliver the correct audio format, 367 current default is 48000hz multiplexed => 96000hz mono 368 which shouldn't matter since analogue TV only supports mono */ 369 return 0; 370} 371 372static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) 373{ 374 struct em28xx *dev = snd_pcm_substream_chip(substream); 375 376 dprintk("Stop capture, if needed\n"); 377 378 if (dev->adev.capture_stream == STREAM_ON) 379 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_STOP_AUDIO); 380 381 return 0; 382} 383 384static int snd_em28xx_prepare(struct snd_pcm_substream *substream) 385{ 386 struct em28xx *dev = snd_pcm_substream_chip(substream); 387 388 dev->adev.hwptr_done_capture = 0; 389 dev->adev.capture_transfer_done = 0; 390 391 return 0; 392} 393 394static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, 395 int cmd) 396{ 397 struct em28xx *dev = snd_pcm_substream_chip(substream); 398 int retval; 399 400 dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START) ? 401 "start" : "stop"); 402 403 spin_lock(&dev->adev.slock); 404 switch (cmd) { 405 case SNDRV_PCM_TRIGGER_START: 406 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_START_AUDIO); 407 retval = 0; 408 break; 409 case SNDRV_PCM_TRIGGER_STOP: 410 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_STOP_AUDIO); 411 retval = 0; 412 break; 413 default: 414 retval = -EINVAL; 415 } 416 417 spin_unlock(&dev->adev.slock); 418 return retval; 419} 420 421static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream 422 *substream) 423{ 424 unsigned long flags; 425 struct em28xx *dev; 426 snd_pcm_uframes_t hwptr_done; 427 428 dev = snd_pcm_substream_chip(substream); 429 spin_lock_irqsave(&dev->adev.slock, flags); 430 hwptr_done = dev->adev.hwptr_done_capture; 431 spin_unlock_irqrestore(&dev->adev.slock, flags); 432 433 return hwptr_done; 434} 435 436static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 437 unsigned long offset) 438{ 439 void *pageptr = subs->runtime->dma_area + offset; 440 441 return vmalloc_to_page(pageptr); 442} 443 444static struct snd_pcm_ops snd_em28xx_pcm_capture = { 445 .open = snd_em28xx_capture_open, 446 .close = snd_em28xx_pcm_close, 447 .ioctl = snd_pcm_lib_ioctl, 448 .hw_params = snd_em28xx_hw_capture_params, 449 .hw_free = snd_em28xx_hw_capture_free, 450 .prepare = snd_em28xx_prepare, 451 .trigger = snd_em28xx_capture_trigger, 452 .pointer = snd_em28xx_capture_pointer, 453 .page = snd_pcm_get_vmalloc_page, 454}; 455 456static int em28xx_audio_init(struct em28xx *dev) 457{ 458 struct em28xx_audio *adev = &dev->adev; 459 struct snd_pcm *pcm; 460 struct snd_card *card; 461 static int devnr; 462 int err; 463 464 if (dev->has_alsa_audio != 1) { 465 /* This device does not support the extension (in this case 466 the device is expecting the snd-usb-audio module or 467 doesn't have analog audio support at all) */ 468 return 0; 469 } 470 471 printk(KERN_INFO "em28xx-audio.c: probing for em28x1 " 472 "non standard usbaudio\n"); 473 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus " 474 "Rechberger\n"); 475 476 err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0, 477 &card); 478 if (err < 0) 479 return err; 480 481 spin_lock_init(&adev->slock); 482 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); 483 if (err < 0) { 484 snd_card_free(card); 485 return err; 486 } 487 488 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); 489 pcm->info_flags = 0; 490 pcm->private_data = dev; 491 strcpy(pcm->name, "Empia 28xx Capture"); 492 493 snd_card_set_dev(card, &dev->udev->dev); 494 strcpy(card->driver, "Em28xx-Audio"); 495 strcpy(card->shortname, "Em28xx Audio"); 496 strcpy(card->longname, "Empia Em28xx Audio"); 497 498 err = snd_card_register(card); 499 if (err < 0) { 500 snd_card_free(card); 501 return err; 502 } 503 adev->sndcard = card; 504 adev->udev = dev->udev; 505 506 return 0; 507} 508 509static int em28xx_audio_fini(struct em28xx *dev) 510{ 511 if (dev == NULL) 512 return 0; 513 514 if (dev->has_alsa_audio != 1) { 515 /* This device does not support the extension (in this case 516 the device is expecting the snd-usb-audio module or 517 doesn't have analog audio support at all) */ 518 return 0; 519 } 520 521 if (dev->adev.sndcard) { 522 snd_card_free(dev->adev.sndcard); 523 dev->adev.sndcard = NULL; 524 } 525 526 return 0; 527} 528 529static struct em28xx_ops audio_ops = { 530 .id = EM28XX_AUDIO, 531 .name = "Em28xx Audio Extension", 532 .init = em28xx_audio_init, 533 .fini = em28xx_audio_fini, 534}; 535 536static int __init em28xx_alsa_register(void) 537{ 538 return em28xx_register_extension(&audio_ops); 539} 540 541static void __exit em28xx_alsa_unregister(void) 542{ 543 em28xx_unregister_extension(&audio_ops); 544} 545 546MODULE_LICENSE("GPL"); 547MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); 548MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); 549MODULE_DESCRIPTION("Em28xx Audio driver"); 550 551module_init(em28xx_alsa_register); 552module_exit(em28xx_alsa_unregister); 553