1/* 2 * Line6 Linux USB driver - 0.9.1beta 3 * 4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation, version 2. 9 * 10 */ 11 12#include <linux/slab.h> 13#include <sound/core.h> 14#include <sound/pcm.h> 15#include <sound/pcm_params.h> 16 17#include "audio.h" 18#include "capture.h" 19#include "driver.h" 20#include "pcm.h" 21#include "pod.h" 22 23/* 24 Find a free URB and submit it. 25*/ 26static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm) 27{ 28 int index; 29 unsigned long flags; 30 int i, urb_size; 31 int ret; 32 struct urb *urb_in; 33 34 spin_lock_irqsave(&line6pcm->lock_audio_in, flags); 35 index = 36 find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS); 37 38 if (index < 0 || index >= LINE6_ISO_BUFFERS) { 39 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags); 40 dev_err(line6pcm->line6->ifcdev, "no free URB found\n"); 41 return -EINVAL; 42 } 43 44 urb_in = line6pcm->urb_audio_in[index]; 45 urb_size = 0; 46 47 for (i = 0; i < LINE6_ISO_PACKETS; ++i) { 48 struct usb_iso_packet_descriptor *fin = 49 &urb_in->iso_frame_desc[i]; 50 fin->offset = urb_size; 51 fin->length = line6pcm->max_packet_size; 52 urb_size += line6pcm->max_packet_size; 53 } 54 55 urb_in->transfer_buffer = 56 line6pcm->buffer_in + 57 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size; 58 urb_in->transfer_buffer_length = urb_size; 59 urb_in->context = line6pcm; 60 61 ret = usb_submit_urb(urb_in, GFP_ATOMIC); 62 63 if (ret == 0) 64 set_bit(index, &line6pcm->active_urb_in); 65 else 66 dev_err(line6pcm->line6->ifcdev, 67 "URB in #%d submission failed (%d)\n", index, ret); 68 69 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags); 70 return 0; 71} 72 73/* 74 Submit all currently available capture URBs. 75*/ 76int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm) 77{ 78 int ret, i; 79 80 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) { 81 ret = submit_audio_in_urb(line6pcm); 82 if (ret < 0) 83 return ret; 84 } 85 86 return 0; 87} 88 89/* 90 Unlink all currently active capture URBs. 91*/ 92void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm) 93{ 94 unsigned int i; 95 96 for (i = LINE6_ISO_BUFFERS; i--;) { 97 if (test_bit(i, &line6pcm->active_urb_in)) { 98 if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) { 99 struct urb *u = line6pcm->urb_audio_in[i]; 100 101 usb_unlink_urb(u); 102 } 103 } 104 } 105} 106 107/* 108 Wait until unlinking of all currently active capture URBs has been 109 finished. 110*/ 111void line6_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm) 112{ 113 int timeout = HZ; 114 unsigned int i; 115 int alive; 116 117 do { 118 alive = 0; 119 for (i = LINE6_ISO_BUFFERS; i--;) { 120 if (test_bit(i, &line6pcm->active_urb_in)) 121 alive++; 122 } 123 if (!alive) 124 break; 125 set_current_state(TASK_UNINTERRUPTIBLE); 126 schedule_timeout(1); 127 } while (--timeout > 0); 128 if (alive) 129 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); 130} 131 132/* 133 Unlink all currently active capture URBs, and wait for finishing. 134*/ 135void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm) 136{ 137 line6_unlink_audio_in_urbs(line6pcm); 138 line6_wait_clear_audio_in_urbs(line6pcm); 139} 140 141/* 142 Copy data into ALSA capture buffer. 143*/ 144void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize) 145{ 146 struct snd_pcm_substream *substream = 147 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); 148 struct snd_pcm_runtime *runtime = substream->runtime; 149 const int bytes_per_frame = line6pcm->properties->bytes_per_frame; 150 int frames = fsize / bytes_per_frame; 151 152 if (runtime == NULL) 153 return; 154 155 if (line6pcm->pos_in_done + frames > runtime->buffer_size) { 156 /* 157 The transferred area goes over buffer boundary, 158 copy two separate chunks. 159 */ 160 int len; 161 162 len = runtime->buffer_size - line6pcm->pos_in_done; 163 164 if (len > 0) { 165 memcpy(runtime->dma_area + 166 line6pcm->pos_in_done * bytes_per_frame, fbuf, 167 len * bytes_per_frame); 168 memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, 169 (frames - len) * bytes_per_frame); 170 } else { 171 /* this is somewhat paranoid */ 172 dev_err(line6pcm->line6->ifcdev, 173 "driver bug: len = %d\n", len); 174 } 175 } else { 176 /* copy single chunk */ 177 memcpy(runtime->dma_area + 178 line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize); 179 } 180 181 line6pcm->pos_in_done += frames; 182 if (line6pcm->pos_in_done >= runtime->buffer_size) 183 line6pcm->pos_in_done -= runtime->buffer_size; 184} 185 186void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length) 187{ 188 struct snd_pcm_substream *substream = 189 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); 190 191 line6pcm->bytes_in += length; 192 if (line6pcm->bytes_in >= line6pcm->period_in) { 193 line6pcm->bytes_in %= line6pcm->period_in; 194 snd_pcm_period_elapsed(substream); 195 } 196} 197 198void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm) 199{ 200 kfree(line6pcm->buffer_in); 201 line6pcm->buffer_in = NULL; 202} 203 204/* 205 * Callback for completed capture URB. 206 */ 207static void audio_in_callback(struct urb *urb) 208{ 209 int i, index, length = 0, shutdown = 0; 210 unsigned long flags; 211 212 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context; 213 214 line6pcm->last_frame_in = urb->start_frame; 215 216 /* find index of URB */ 217 for (index = 0; index < LINE6_ISO_BUFFERS; ++index) 218 if (urb == line6pcm->urb_audio_in[index]) 219 break; 220 221 spin_lock_irqsave(&line6pcm->lock_audio_in, flags); 222 223 for (i = 0; i < LINE6_ISO_PACKETS; ++i) { 224 char *fbuf; 225 int fsize; 226 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i]; 227 228 if (fin->status == -EXDEV) { 229 shutdown = 1; 230 break; 231 } 232 233 fbuf = urb->transfer_buffer + fin->offset; 234 fsize = fin->actual_length; 235 236 if (fsize > line6pcm->max_packet_size) { 237 dev_err(line6pcm->line6->ifcdev, 238 "driver and/or device bug: packet too large (%d > %d)\n", 239 fsize, line6pcm->max_packet_size); 240 } 241 242 length += fsize; 243 244 /* the following assumes LINE6_ISO_PACKETS == 1: */ 245 line6pcm->prev_fbuf = fbuf; 246 line6pcm->prev_fsize = fsize; 247 248#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE 249 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE)) 250#endif 251 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, 252 &line6pcm->flags) && (fsize > 0)) 253 line6_capture_copy(line6pcm, fbuf, fsize); 254 } 255 256 clear_bit(index, &line6pcm->active_urb_in); 257 258 if (test_and_clear_bit(index, &line6pcm->unlink_urb_in)) 259 shutdown = 1; 260 261 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags); 262 263 if (!shutdown) { 264 submit_audio_in_urb(line6pcm); 265 266#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE 267 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE)) 268#endif 269 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, 270 &line6pcm->flags)) 271 line6_capture_check_period(line6pcm, length); 272 } 273} 274 275/* open capture callback */ 276static int snd_line6_capture_open(struct snd_pcm_substream *substream) 277{ 278 int err; 279 struct snd_pcm_runtime *runtime = substream->runtime; 280 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 281 282 err = snd_pcm_hw_constraint_ratdens(runtime, 0, 283 SNDRV_PCM_HW_PARAM_RATE, 284 (&line6pcm-> 285 properties->snd_line6_rates)); 286 if (err < 0) 287 return err; 288 289 runtime->hw = line6pcm->properties->snd_line6_capture_hw; 290 return 0; 291} 292 293/* close capture callback */ 294static int snd_line6_capture_close(struct snd_pcm_substream *substream) 295{ 296 return 0; 297} 298 299/* hw_params capture callback */ 300static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream, 301 struct snd_pcm_hw_params *hw_params) 302{ 303 int ret; 304 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 305 306 /* -- Florian Demski [FD] */ 307 /* don't ask me why, but this fixes the bug on my machine */ 308 if (line6pcm == NULL) { 309 if (substream->pcm == NULL) 310 return -ENOMEM; 311 if (substream->pcm->private_data == NULL) 312 return -ENOMEM; 313 substream->private_data = substream->pcm->private_data; 314 line6pcm = snd_pcm_substream_chip(substream); 315 } 316 /* -- [FD] end */ 317 318 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER); 319 320 if (ret < 0) 321 return ret; 322 323 ret = snd_pcm_lib_malloc_pages(substream, 324 params_buffer_bytes(hw_params)); 325 if (ret < 0) { 326 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER); 327 return ret; 328 } 329 330 line6pcm->period_in = params_period_bytes(hw_params); 331 return 0; 332} 333 334/* hw_free capture callback */ 335static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream) 336{ 337 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 338 339 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER); 340 return snd_pcm_lib_free_pages(substream); 341} 342 343/* trigger callback */ 344int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd) 345{ 346 int err; 347 348 switch (cmd) { 349 case SNDRV_PCM_TRIGGER_START: 350#ifdef CONFIG_PM 351 case SNDRV_PCM_TRIGGER_RESUME: 352#endif 353 err = line6_pcm_acquire(line6pcm, 354 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM); 355 356 if (err < 0) 357 return err; 358 359 break; 360 361 case SNDRV_PCM_TRIGGER_STOP: 362#ifdef CONFIG_PM 363 case SNDRV_PCM_TRIGGER_SUSPEND: 364#endif 365 err = line6_pcm_release(line6pcm, 366 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM); 367 368 if (err < 0) 369 return err; 370 371 break; 372 373 default: 374 return -EINVAL; 375 } 376 377 return 0; 378} 379 380/* capture pointer callback */ 381static snd_pcm_uframes_t 382snd_line6_capture_pointer(struct snd_pcm_substream *substream) 383{ 384 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 385 386 return line6pcm->pos_in_done; 387} 388 389/* capture operators */ 390struct snd_pcm_ops snd_line6_capture_ops = { 391 .open = snd_line6_capture_open, 392 .close = snd_line6_capture_close, 393 .ioctl = snd_pcm_lib_ioctl, 394 .hw_params = snd_line6_capture_hw_params, 395 .hw_free = snd_line6_capture_hw_free, 396 .prepare = snd_line6_prepare, 397 .trigger = snd_line6_trigger, 398 .pointer = snd_line6_capture_pointer, 399}; 400 401int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm) 402{ 403 int i; 404 405 /* create audio URBs and fill in constant values: */ 406 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) { 407 struct urb *urb; 408 409 /* URB for audio in: */ 410 urb = line6pcm->urb_audio_in[i] = 411 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL); 412 413 if (urb == NULL) { 414 dev_err(line6pcm->line6->ifcdev, "Out of memory\n"); 415 return -ENOMEM; 416 } 417 418 urb->dev = line6pcm->line6->usbdev; 419 urb->pipe = 420 usb_rcvisocpipe(line6pcm->line6->usbdev, 421 line6pcm->ep_audio_read & 422 USB_ENDPOINT_NUMBER_MASK); 423 urb->transfer_flags = URB_ISO_ASAP; 424 urb->start_frame = -1; 425 urb->number_of_packets = LINE6_ISO_PACKETS; 426 urb->interval = LINE6_ISO_INTERVAL; 427 urb->error_count = 0; 428 urb->complete = audio_in_callback; 429 } 430 431 return 0; 432} 433