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 22 /* 23 Find a free URB and submit it. 24 */ 25 static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm) 26 { 27 int index; 28 unsigned long flags; 29 int i, urb_size; 30 int ret; 31 struct urb *urb_in; 32 33 spin_lock_irqsave(&line6pcm->lock_audio_in, flags); 34 index = 35 find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS); 36 37 if (index < 0 || index >= LINE6_ISO_BUFFERS) { 38 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags); 39 dev_err(line6pcm->line6->ifcdev, "no free URB found\n"); 40 return -EINVAL; 41 } 42 43 urb_in = line6pcm->urb_audio_in[index]; 44 urb_size = 0; 45 46 for (i = 0; i < LINE6_ISO_PACKETS; ++i) { 47 struct usb_iso_packet_descriptor *fin = 48 &urb_in->iso_frame_desc[i]; 49 fin->offset = urb_size; 50 fin->length = line6pcm->max_packet_size; 51 urb_size += line6pcm->max_packet_size; 52 } 53 54 urb_in->transfer_buffer = 55 line6pcm->buffer_in + 56 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size; 57 urb_in->transfer_buffer_length = urb_size; 58 urb_in->context = line6pcm; 59 60 ret = usb_submit_urb(urb_in, GFP_ATOMIC); 61 62 if (ret == 0) 63 set_bit(index, &line6pcm->active_urb_in); 64 else 65 dev_err(line6pcm->line6->ifcdev, 66 "URB in #%d submission failed (%d)\n", index, ret); 67 68 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags); 69 return 0; 70 } 71 72 /* 73 Submit all currently available capture URBs. 74 */ 75 int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm) 76 { 77 int ret, i; 78 79 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) { 80 ret = submit_audio_in_urb(line6pcm); 81 if (ret < 0) 82 return ret; 83 } 84 85 return 0; 86 } 87 88 /* 89 Unlink all currently active capture URBs. 90 */ 91 void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm) 92 { 93 unsigned int i; 94 95 for (i = LINE6_ISO_BUFFERS; i--;) { 96 if (test_bit(i, &line6pcm->active_urb_in)) { 97 if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) { 98 struct urb *u = line6pcm->urb_audio_in[i]; 99 100 usb_unlink_urb(u); 101 } 102 } 103 } 104 } 105 106 /* 107 Wait until unlinking of all currently active capture URBs has been 108 finished. 109 */ 110 void line6_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm) 111 { 112 int timeout = HZ; 113 unsigned int i; 114 int alive; 115 116 do { 117 alive = 0; 118 for (i = LINE6_ISO_BUFFERS; i--;) { 119 if (test_bit(i, &line6pcm->active_urb_in)) 120 alive++; 121 } 122 if (!alive) 123 break; 124 set_current_state(TASK_UNINTERRUPTIBLE); 125 schedule_timeout(1); 126 } while (--timeout > 0); 127 if (alive) 128 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); 129 } 130 131 /* 132 Unlink all currently active capture URBs, and wait for finishing. 133 */ 134 void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm) 135 { 136 line6_unlink_audio_in_urbs(line6pcm); 137 line6_wait_clear_audio_in_urbs(line6pcm); 138 } 139 140 /* 141 Copy data into ALSA capture buffer. 142 */ 143 void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize) 144 { 145 struct snd_pcm_substream *substream = 146 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); 147 struct snd_pcm_runtime *runtime = substream->runtime; 148 const int bytes_per_frame = line6pcm->properties->bytes_per_frame; 149 int frames = fsize / bytes_per_frame; 150 151 if (runtime == NULL) 152 return; 153 154 if (line6pcm->pos_in_done + frames > runtime->buffer_size) { 155 /* 156 The transferred area goes over buffer boundary, 157 copy two separate chunks. 158 */ 159 int len; 160 161 len = runtime->buffer_size - line6pcm->pos_in_done; 162 163 if (len > 0) { 164 memcpy(runtime->dma_area + 165 line6pcm->pos_in_done * bytes_per_frame, fbuf, 166 len * bytes_per_frame); 167 memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, 168 (frames - len) * bytes_per_frame); 169 } else { 170 /* this is somewhat paranoid */ 171 dev_err(line6pcm->line6->ifcdev, 172 "driver bug: len = %d\n", len); 173 } 174 } else { 175 /* copy single chunk */ 176 memcpy(runtime->dma_area + 177 line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize); 178 } 179 180 line6pcm->pos_in_done += frames; 181 if (line6pcm->pos_in_done >= runtime->buffer_size) 182 line6pcm->pos_in_done -= runtime->buffer_size; 183 } 184 185 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length) 186 { 187 struct snd_pcm_substream *substream = 188 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); 189 190 line6pcm->bytes_in += length; 191 if (line6pcm->bytes_in >= line6pcm->period_in) { 192 line6pcm->bytes_in %= line6pcm->period_in; 193 snd_pcm_period_elapsed(substream); 194 } 195 } 196 197 void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm) 198 { 199 kfree(line6pcm->buffer_in); 200 line6pcm->buffer_in = NULL; 201 } 202 203 /* 204 * Callback for completed capture URB. 205 */ 206 static void audio_in_callback(struct urb *urb) 207 { 208 int i, index, length = 0, shutdown = 0; 209 unsigned long flags; 210 211 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context; 212 213 line6pcm->last_frame_in = urb->start_frame; 214 215 /* find index of URB */ 216 for (index = 0; index < LINE6_ISO_BUFFERS; ++index) 217 if (urb == line6pcm->urb_audio_in[index]) 218 break; 219 220 spin_lock_irqsave(&line6pcm->lock_audio_in, flags); 221 222 for (i = 0; i < LINE6_ISO_PACKETS; ++i) { 223 char *fbuf; 224 int fsize; 225 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i]; 226 227 if (fin->status == -EXDEV) { 228 shutdown = 1; 229 break; 230 } 231 232 fbuf = urb->transfer_buffer + fin->offset; 233 fsize = fin->actual_length; 234 235 if (fsize > line6pcm->max_packet_size) { 236 dev_err(line6pcm->line6->ifcdev, 237 "driver and/or device bug: packet too large (%d > %d)\n", 238 fsize, line6pcm->max_packet_size); 239 } 240 241 length += fsize; 242 243 /* the following assumes LINE6_ISO_PACKETS == 1: */ 244 line6pcm->prev_fbuf = fbuf; 245 line6pcm->prev_fsize = fsize; 246 247 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE 248 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE)) 249 #endif 250 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, 251 &line6pcm->flags) && (fsize > 0)) 252 line6_capture_copy(line6pcm, fbuf, fsize); 253 } 254 255 clear_bit(index, &line6pcm->active_urb_in); 256 257 if (test_and_clear_bit(index, &line6pcm->unlink_urb_in)) 258 shutdown = 1; 259 260 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags); 261 262 if (!shutdown) { 263 submit_audio_in_urb(line6pcm); 264 265 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE 266 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE)) 267 #endif 268 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, 269 &line6pcm->flags)) 270 line6_capture_check_period(line6pcm, length); 271 } 272 } 273 274 /* open capture callback */ 275 static int snd_line6_capture_open(struct snd_pcm_substream *substream) 276 { 277 int err; 278 struct snd_pcm_runtime *runtime = substream->runtime; 279 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 280 281 err = snd_pcm_hw_constraint_ratdens(runtime, 0, 282 SNDRV_PCM_HW_PARAM_RATE, 283 (&line6pcm-> 284 properties->snd_line6_rates)); 285 if (err < 0) 286 return err; 287 288 runtime->hw = line6pcm->properties->snd_line6_capture_hw; 289 return 0; 290 } 291 292 /* close capture callback */ 293 static int snd_line6_capture_close(struct snd_pcm_substream *substream) 294 { 295 return 0; 296 } 297 298 /* hw_params capture callback */ 299 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream, 300 struct snd_pcm_hw_params *hw_params) 301 { 302 int ret; 303 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 304 305 /* -- Florian Demski [FD] */ 306 /* don't ask me why, but this fixes the bug on my machine */ 307 if (line6pcm == NULL) { 308 if (substream->pcm == NULL) 309 return -ENOMEM; 310 if (substream->pcm->private_data == NULL) 311 return -ENOMEM; 312 substream->private_data = substream->pcm->private_data; 313 line6pcm = snd_pcm_substream_chip(substream); 314 } 315 /* -- [FD] end */ 316 317 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER); 318 319 if (ret < 0) 320 return ret; 321 322 ret = snd_pcm_lib_malloc_pages(substream, 323 params_buffer_bytes(hw_params)); 324 if (ret < 0) { 325 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER); 326 return ret; 327 } 328 329 line6pcm->period_in = params_period_bytes(hw_params); 330 return 0; 331 } 332 333 /* hw_free capture callback */ 334 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream) 335 { 336 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 337 338 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER); 339 return snd_pcm_lib_free_pages(substream); 340 } 341 342 /* trigger callback */ 343 int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd) 344 { 345 int err; 346 347 switch (cmd) { 348 case SNDRV_PCM_TRIGGER_START: 349 #ifdef CONFIG_PM 350 case SNDRV_PCM_TRIGGER_RESUME: 351 #endif 352 err = line6_pcm_acquire(line6pcm, 353 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM); 354 355 if (err < 0) 356 return err; 357 358 break; 359 360 case SNDRV_PCM_TRIGGER_STOP: 361 #ifdef CONFIG_PM 362 case SNDRV_PCM_TRIGGER_SUSPEND: 363 #endif 364 err = line6_pcm_release(line6pcm, 365 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM); 366 367 if (err < 0) 368 return err; 369 370 break; 371 372 default: 373 return -EINVAL; 374 } 375 376 return 0; 377 } 378 379 /* capture pointer callback */ 380 static snd_pcm_uframes_t 381 snd_line6_capture_pointer(struct snd_pcm_substream *substream) 382 { 383 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 384 385 return line6pcm->pos_in_done; 386 } 387 388 /* capture operators */ 389 struct snd_pcm_ops snd_line6_capture_ops = { 390 .open = snd_line6_capture_open, 391 .close = snd_line6_capture_close, 392 .ioctl = snd_pcm_lib_ioctl, 393 .hw_params = snd_line6_capture_hw_params, 394 .hw_free = snd_line6_capture_hw_free, 395 .prepare = snd_line6_prepare, 396 .trigger = snd_line6_trigger, 397 .pointer = snd_line6_capture_pointer, 398 }; 399 400 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm) 401 { 402 struct usb_line6 *line6 = line6pcm->line6; 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(line6->ifcdev, "Out of memory\n"); 415 return -ENOMEM; 416 } 417 418 urb->dev = line6->usbdev; 419 urb->pipe = 420 usb_rcvisocpipe(line6->usbdev, 421 line6->properties->ep_audio_r & 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