2 * Line6 Linux USB driver - 0.9.1beta
4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
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.
12 #include <linux/slab.h>
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
25 Software stereo volume control.
27 static void change_volume(struct urb *urb_out, int volume[],
32 if (volume[0] == 256 && volume[1] == 256)
33 return; /* maximum volume - no change */
35 if (bytes_per_frame == 4) {
37 p = (short *)urb_out->transfer_buffer;
38 buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
40 for (; p < buf_end; ++p) {
41 *p = (*p * volume[chn & 1]) >> 8;
44 } else if (bytes_per_frame == 6) {
45 unsigned char *p, *buf_end;
46 p = (unsigned char *)urb_out->transfer_buffer;
47 buf_end = p + urb_out->transfer_buffer_length;
49 for (; p < buf_end; p += 3) {
51 val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
52 val = (val * volume[chn & 1]) >> 8;
61 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
64 Create signal for impulse response test.
66 static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
67 struct urb *urb_out, int bytes_per_frame)
69 int frames = urb_out->transfer_buffer_length / bytes_per_frame;
71 if (bytes_per_frame == 4) {
73 short *pi = (short *)line6pcm->prev_fbuf;
74 short *po = (short *)urb_out->transfer_buffer;
76 for (i = 0; i < frames; ++i) {
82 } else if (bytes_per_frame == 6) {
84 unsigned char *pi = line6pcm->prev_fbuf;
85 unsigned char *po = urb_out->transfer_buffer;
87 for (i = 0; i < frames; ++i) {
88 for (j = 0; j < bytes_per_frame / 2; ++j)
91 for (; j < bytes_per_frame; ++j)
94 pi += bytes_per_frame;
95 po += bytes_per_frame;
98 if (--line6pcm->impulse_count <= 0) {
99 ((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
101 line6pcm->impulse_volume;
102 line6pcm->impulse_count = line6pcm->impulse_period;
109 Add signal to buffer for software monitoring.
111 static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
112 int volume, int bytes_per_frame)
115 return; /* zero volume - no change */
117 if (bytes_per_frame == 4) {
118 short *pi, *po, *buf_end;
119 pi = (short *)signal;
120 po = (short *)urb_out->transfer_buffer;
121 buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
123 for (; po < buf_end; ++pi, ++po)
124 *po += (*pi * volume) >> 8;
128 We don't need to handle devices with 6 bytes per frame here
129 since they all support hardware monitoring.
134 Find a free URB, prepare audio data, and submit URB.
136 static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
140 int i, urb_size, urb_frames;
142 const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
143 const int frame_increment =
144 line6pcm->properties->snd_line6_rates.rats[0].num_min;
145 const int frame_factor =
146 line6pcm->properties->snd_line6_rates.rats[0].den *
147 (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
150 spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
152 find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
154 if (index < 0 || index >= LINE6_ISO_BUFFERS) {
155 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
156 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
160 urb_out = line6pcm->urb_audio_out[index];
163 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
164 /* compute frame size for given sampling rate */
166 struct usb_iso_packet_descriptor *fout =
167 &urb_out->iso_frame_desc[i];
169 if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
170 fsize = line6pcm->prev_fsize;
174 line6pcm->count_out += frame_increment;
175 n = line6pcm->count_out / frame_factor;
176 line6pcm->count_out -= n * frame_factor;
177 fsize = n * bytes_per_frame;
180 fout->offset = urb_size;
181 fout->length = fsize;
186 /* can't determine URB size */
187 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
188 dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
192 urb_frames = urb_size / bytes_per_frame;
193 urb_out->transfer_buffer =
194 line6pcm->buffer_out +
195 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
196 urb_out->transfer_buffer_length = urb_size;
197 urb_out->context = line6pcm;
199 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags) &&
200 !test_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags)) {
201 struct snd_pcm_runtime *runtime =
202 get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
204 if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
206 The transferred area goes over buffer boundary,
207 copy the data to the temp buffer.
210 len = runtime->buffer_size - line6pcm->pos_out;
213 memcpy(urb_out->transfer_buffer,
215 line6pcm->pos_out * bytes_per_frame,
216 len * bytes_per_frame);
217 memcpy(urb_out->transfer_buffer +
218 len * bytes_per_frame, runtime->dma_area,
219 (urb_frames - len) * bytes_per_frame);
221 dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
224 memcpy(urb_out->transfer_buffer,
226 line6pcm->pos_out * bytes_per_frame,
227 urb_out->transfer_buffer_length);
230 line6pcm->pos_out += urb_frames;
231 if (line6pcm->pos_out >= runtime->buffer_size)
232 line6pcm->pos_out -= runtime->buffer_size;
234 memset(urb_out->transfer_buffer, 0,
235 urb_out->transfer_buffer_length);
238 change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
240 if (line6pcm->prev_fbuf != NULL) {
241 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
242 if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
243 create_impulse_test_signal(line6pcm, urb_out,
245 if (line6pcm->flags & LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
246 line6_capture_copy(line6pcm,
247 urb_out->transfer_buffer,
249 transfer_buffer_length);
250 line6_capture_check_period(line6pcm,
251 urb_out->transfer_buffer_length);
257 properties->capabilities & LINE6_BIT_HWMON)
258 && (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
259 && (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
260 add_monitor_signal(urb_out, line6pcm->prev_fbuf,
261 line6pcm->volume_monitor,
263 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
267 #ifdef CONFIG_LINE6_USB_DUMP_PCM
268 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
269 struct usb_iso_packet_descriptor *fout =
270 &urb_out->iso_frame_desc[i];
271 line6_write_hexdump(line6pcm->line6, 'P',
272 urb_out->transfer_buffer + fout->offset,
277 ret = usb_submit_urb(urb_out, GFP_ATOMIC);
280 set_bit(index, &line6pcm->active_urb_out);
282 dev_err(line6pcm->line6->ifcdev,
283 "URB out #%d submission failed (%d)\n", index, ret);
285 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
290 Submit all currently available playback URBs.
292 int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
296 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
297 ret = submit_audio_out_urb(line6pcm);
306 Unlink all currently active playback URBs.
308 void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
312 for (i = LINE6_ISO_BUFFERS; i--;) {
313 if (test_bit(i, &line6pcm->active_urb_out)) {
314 if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
315 struct urb *u = line6pcm->urb_audio_out[i];
323 Wait until unlinking of all currently active playback URBs has been
326 void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
334 for (i = LINE6_ISO_BUFFERS; i--;) {
335 if (test_bit(i, &line6pcm->active_urb_out))
340 set_current_state(TASK_UNINTERRUPTIBLE);
342 } while (--timeout > 0);
344 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
348 Unlink all currently active playback URBs, and wait for finishing.
350 void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
352 line6_unlink_audio_out_urbs(line6pcm);
353 line6_wait_clear_audio_out_urbs(line6pcm);
356 void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
358 kfree(line6pcm->buffer_out);
359 line6pcm->buffer_out = NULL;
363 Callback for completed playback URB.
365 static void audio_out_callback(struct urb *urb)
367 int i, index, length = 0, shutdown = 0;
370 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
371 struct snd_pcm_substream *substream =
372 get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
374 #if USE_CLEAR_BUFFER_WORKAROUND
375 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
378 line6pcm->last_frame_out = urb->start_frame;
380 /* find index of URB */
381 for (index = LINE6_ISO_BUFFERS; index--;)
382 if (urb == line6pcm->urb_audio_out[index])
386 return; /* URB has been unlinked asynchronously */
388 for (i = LINE6_ISO_PACKETS; i--;)
389 length += urb->iso_frame_desc[i].length;
391 spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
393 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
394 struct snd_pcm_runtime *runtime = substream->runtime;
395 line6pcm->pos_out_done +=
396 length / line6pcm->properties->bytes_per_frame;
398 if (line6pcm->pos_out_done >= runtime->buffer_size)
399 line6pcm->pos_out_done -= runtime->buffer_size;
402 clear_bit(index, &line6pcm->active_urb_out);
404 for (i = LINE6_ISO_PACKETS; i--;)
405 if (urb->iso_frame_desc[i].status == -EXDEV) {
410 if (test_and_clear_bit(index, &line6pcm->unlink_urb_out))
413 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
416 submit_audio_out_urb(line6pcm);
418 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
420 line6pcm->bytes_out += length;
421 if (line6pcm->bytes_out >= line6pcm->period_out) {
422 line6pcm->bytes_out %= line6pcm->period_out;
423 snd_pcm_period_elapsed(substream);
429 /* open playback callback */
430 static int snd_line6_playback_open(struct snd_pcm_substream *substream)
433 struct snd_pcm_runtime *runtime = substream->runtime;
434 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
436 err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
438 properties->snd_line6_rates));
442 runtime->hw = line6pcm->properties->snd_line6_playback_hw;
446 /* close playback callback */
447 static int snd_line6_playback_close(struct snd_pcm_substream *substream)
452 /* hw_params playback callback */
453 static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
454 struct snd_pcm_hw_params *hw_params)
457 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
459 /* -- Florian Demski [FD] */
460 /* don't ask me why, but this fixes the bug on my machine */
461 if (line6pcm == NULL) {
462 if (substream->pcm == NULL)
464 if (substream->pcm->private_data == NULL)
466 substream->private_data = substream->pcm->private_data;
467 line6pcm = snd_pcm_substream_chip(substream);
471 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
476 ret = snd_pcm_lib_malloc_pages(substream,
477 params_buffer_bytes(hw_params));
479 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
483 line6pcm->period_out = params_period_bytes(hw_params);
487 /* hw_free playback callback */
488 static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
490 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
491 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
492 return snd_pcm_lib_free_pages(substream);
495 /* trigger playback callback */
496 int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
501 case SNDRV_PCM_TRIGGER_START:
503 case SNDRV_PCM_TRIGGER_RESUME:
505 err = line6_pcm_acquire(line6pcm,
506 LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
513 case SNDRV_PCM_TRIGGER_STOP:
515 case SNDRV_PCM_TRIGGER_SUSPEND:
517 err = line6_pcm_release(line6pcm,
518 LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
525 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
526 set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
529 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
530 clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
540 /* playback pointer callback */
541 static snd_pcm_uframes_t
542 snd_line6_playback_pointer(struct snd_pcm_substream *substream)
544 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
545 return line6pcm->pos_out_done;
548 /* playback operators */
549 struct snd_pcm_ops snd_line6_playback_ops = {
550 .open = snd_line6_playback_open,
551 .close = snd_line6_playback_close,
552 .ioctl = snd_pcm_lib_ioctl,
553 .hw_params = snd_line6_playback_hw_params,
554 .hw_free = snd_line6_playback_hw_free,
555 .prepare = snd_line6_prepare,
556 .trigger = snd_line6_trigger,
557 .pointer = snd_line6_playback_pointer,
560 int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
564 /* create audio URBs and fill in constant values: */
565 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
568 /* URB for audio out: */
569 urb = line6pcm->urb_audio_out[i] =
570 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
573 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
577 urb->dev = line6pcm->line6->usbdev;
579 usb_sndisocpipe(line6pcm->line6->usbdev,
580 line6pcm->ep_audio_write &
581 USB_ENDPOINT_NUMBER_MASK);
582 urb->transfer_flags = URB_ISO_ASAP;
583 urb->start_frame = -1;
584 urb->number_of_packets = LINE6_ISO_PACKETS;
585 urb->interval = LINE6_ISO_INTERVAL;
586 urb->error_count = 0;
587 urb->complete = audio_out_callback;