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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 #include "playback.h"
23 
24 /*
25 	Software stereo volume control.
26 */
change_volume(struct urb * urb_out,int volume[],int bytes_per_frame)27 static void change_volume(struct urb *urb_out, int volume[],
28 			  int bytes_per_frame)
29 {
30 	int chn = 0;
31 
32 	if (volume[0] == 256 && volume[1] == 256)
33 		return;		/* maximum volume - no change */
34 
35 	if (bytes_per_frame == 4) {
36 		short *p, *buf_end;
37 		p = (short *)urb_out->transfer_buffer;
38 		buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
39 
40 		for (; p < buf_end; ++p) {
41 			*p = (*p * volume[chn & 1]) >> 8;
42 			++chn;
43 		}
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;
48 
49 		for (; p < buf_end; p += 3) {
50 			int val;
51 			val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
52 			val = (val * volume[chn & 1]) >> 8;
53 			p[0] = val;
54 			p[1] = val >> 8;
55 			p[2] = val >> 16;
56 			++chn;
57 		}
58 	}
59 }
60 
61 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
62 
63 /*
64 	Create signal for impulse response test.
65 */
create_impulse_test_signal(struct snd_line6_pcm * line6pcm,struct urb * urb_out,int bytes_per_frame)66 static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
67 				       struct urb *urb_out, int bytes_per_frame)
68 {
69 	int frames = urb_out->transfer_buffer_length / bytes_per_frame;
70 
71 	if (bytes_per_frame == 4) {
72 		int i;
73 		short *pi = (short *)line6pcm->prev_fbuf;
74 		short *po = (short *)urb_out->transfer_buffer;
75 
76 		for (i = 0; i < frames; ++i) {
77 			po[0] = pi[0];
78 			po[1] = 0;
79 			pi += 2;
80 			po += 2;
81 		}
82 	} else if (bytes_per_frame == 6) {
83 		int i, j;
84 		unsigned char *pi = line6pcm->prev_fbuf;
85 		unsigned char *po = urb_out->transfer_buffer;
86 
87 		for (i = 0; i < frames; ++i) {
88 			for (j = 0; j < bytes_per_frame / 2; ++j)
89 				po[j] = pi[j];
90 
91 			for (; j < bytes_per_frame; ++j)
92 				po[j] = 0;
93 
94 			pi += bytes_per_frame;
95 			po += bytes_per_frame;
96 		}
97 	}
98 	if (--line6pcm->impulse_count <= 0) {
99 		((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
100 							      1] =
101 		    line6pcm->impulse_volume;
102 		line6pcm->impulse_count = line6pcm->impulse_period;
103 	}
104 }
105 
106 #endif
107 
108 /*
109 	Add signal to buffer for software monitoring.
110 */
add_monitor_signal(struct urb * urb_out,unsigned char * signal,int volume,int bytes_per_frame)111 static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
112 			       int volume, int bytes_per_frame)
113 {
114 	if (volume == 0)
115 		return;		/* zero volume - no change */
116 
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);
122 
123 		for (; po < buf_end; ++pi, ++po)
124 			*po += (*pi * volume) >> 8;
125 	}
126 
127 	/*
128 	   We don't need to handle devices with 6 bytes per frame here
129 	   since they all support hardware monitoring.
130 	 */
131 }
132 
133 /*
134 	Find a free URB, prepare audio data, and submit URB.
135 */
submit_audio_out_urb(struct snd_line6_pcm * line6pcm)136 static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
137 {
138 	int index;
139 	unsigned long flags;
140 	int i, urb_size, urb_frames;
141 	int ret;
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);
148 	struct urb *urb_out;
149 
150 	spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
151 	index =
152 	    find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
153 
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");
157 		return -EINVAL;
158 	}
159 
160 	urb_out = line6pcm->urb_audio_out[index];
161 	urb_size = 0;
162 
163 	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
164 		/* compute frame size for given sampling rate */
165 		int fsize = 0;
166 		struct usb_iso_packet_descriptor *fout =
167 		    &urb_out->iso_frame_desc[i];
168 
169 		if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
170 			fsize = line6pcm->prev_fsize;
171 
172 		if (fsize == 0) {
173 			int n;
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;
178 		}
179 
180 		fout->offset = urb_size;
181 		fout->length = fsize;
182 		urb_size += fsize;
183 	}
184 
185 	if (urb_size == 0) {
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");
189 		return -EINVAL;
190 	}
191 
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;
198 
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;
203 
204 		if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
205 			/*
206 			   The transferred area goes over buffer boundary,
207 			   copy the data to the temp buffer.
208 			 */
209 			int len;
210 			len = runtime->buffer_size - line6pcm->pos_out;
211 
212 			if (len > 0) {
213 				memcpy(urb_out->transfer_buffer,
214 				       runtime->dma_area +
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);
220 			} else
221 				dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
222 					len);
223 		} else {
224 			memcpy(urb_out->transfer_buffer,
225 			       runtime->dma_area +
226 			       line6pcm->pos_out * bytes_per_frame,
227 			       urb_out->transfer_buffer_length);
228 		}
229 
230 		line6pcm->pos_out += urb_frames;
231 		if (line6pcm->pos_out >= runtime->buffer_size)
232 			line6pcm->pos_out -= runtime->buffer_size;
233 	} else {
234 		memset(urb_out->transfer_buffer, 0,
235 		       urb_out->transfer_buffer_length);
236 	}
237 
238 	change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
239 
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,
244 						   bytes_per_frame);
245 			if (line6pcm->flags & LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
246 				line6_capture_copy(line6pcm,
247 						   urb_out->transfer_buffer,
248 						   urb_out->
249 						   transfer_buffer_length);
250 				line6_capture_check_period(line6pcm,
251 							   urb_out->transfer_buffer_length);
252 			}
253 		} else {
254 #endif
255 			if (!
256 			    (line6pcm->line6->
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,
262 						   bytes_per_frame);
263 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
264 		}
265 #endif
266 	}
267 
268 	ret = usb_submit_urb(urb_out, GFP_ATOMIC);
269 
270 	if (ret == 0)
271 		set_bit(index, &line6pcm->active_urb_out);
272 	else
273 		dev_err(line6pcm->line6->ifcdev,
274 			"URB out #%d submission failed (%d)\n", index, ret);
275 
276 	spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
277 	return 0;
278 }
279 
280 /*
281 	Submit all currently available playback URBs.
282 */
line6_submit_audio_out_all_urbs(struct snd_line6_pcm * line6pcm)283 int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
284 {
285 	int ret, i;
286 
287 	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
288 		ret = submit_audio_out_urb(line6pcm);
289 		if (ret < 0)
290 			return ret;
291 	}
292 
293 	return 0;
294 }
295 
296 /*
297 	Unlink all currently active playback URBs.
298 */
line6_unlink_audio_out_urbs(struct snd_line6_pcm * line6pcm)299 void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
300 {
301 	unsigned int i;
302 
303 	for (i = LINE6_ISO_BUFFERS; i--;) {
304 		if (test_bit(i, &line6pcm->active_urb_out)) {
305 			if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
306 				struct urb *u = line6pcm->urb_audio_out[i];
307 				usb_unlink_urb(u);
308 			}
309 		}
310 	}
311 }
312 
313 /*
314 	Wait until unlinking of all currently active playback URBs has been
315 	finished.
316 */
line6_wait_clear_audio_out_urbs(struct snd_line6_pcm * line6pcm)317 void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
318 {
319 	int timeout = HZ;
320 	unsigned int i;
321 	int alive;
322 
323 	do {
324 		alive = 0;
325 		for (i = LINE6_ISO_BUFFERS; i--;) {
326 			if (test_bit(i, &line6pcm->active_urb_out))
327 				alive++;
328 		}
329 		if (!alive)
330 			break;
331 		set_current_state(TASK_UNINTERRUPTIBLE);
332 		schedule_timeout(1);
333 	} while (--timeout > 0);
334 	if (alive)
335 		snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
336 }
337 
338 /*
339 	Unlink all currently active playback URBs, and wait for finishing.
340 */
line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm * line6pcm)341 void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
342 {
343 	line6_unlink_audio_out_urbs(line6pcm);
344 	line6_wait_clear_audio_out_urbs(line6pcm);
345 }
346 
line6_free_playback_buffer(struct snd_line6_pcm * line6pcm)347 void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
348 {
349 	kfree(line6pcm->buffer_out);
350 	line6pcm->buffer_out = NULL;
351 }
352 
353 /*
354 	Callback for completed playback URB.
355 */
audio_out_callback(struct urb * urb)356 static void audio_out_callback(struct urb *urb)
357 {
358 	int i, index, length = 0, shutdown = 0;
359 	unsigned long flags;
360 
361 	struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
362 	struct snd_pcm_substream *substream =
363 	    get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
364 
365 #if USE_CLEAR_BUFFER_WORKAROUND
366 	memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
367 #endif
368 
369 	line6pcm->last_frame_out = urb->start_frame;
370 
371 	/* find index of URB */
372 	for (index = LINE6_ISO_BUFFERS; index--;)
373 		if (urb == line6pcm->urb_audio_out[index])
374 			break;
375 
376 	if (index < 0)
377 		return;		/* URB has been unlinked asynchronously */
378 
379 	for (i = LINE6_ISO_PACKETS; i--;)
380 		length += urb->iso_frame_desc[i].length;
381 
382 	spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
383 
384 	if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
385 		struct snd_pcm_runtime *runtime = substream->runtime;
386 		line6pcm->pos_out_done +=
387 		    length / line6pcm->properties->bytes_per_frame;
388 
389 		if (line6pcm->pos_out_done >= runtime->buffer_size)
390 			line6pcm->pos_out_done -= runtime->buffer_size;
391 	}
392 
393 	clear_bit(index, &line6pcm->active_urb_out);
394 
395 	for (i = LINE6_ISO_PACKETS; i--;)
396 		if (urb->iso_frame_desc[i].status == -EXDEV) {
397 			shutdown = 1;
398 			break;
399 		}
400 
401 	if (test_and_clear_bit(index, &line6pcm->unlink_urb_out))
402 		shutdown = 1;
403 
404 	spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
405 
406 	if (!shutdown) {
407 		submit_audio_out_urb(line6pcm);
408 
409 		if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
410 			     &line6pcm->flags)) {
411 			line6pcm->bytes_out += length;
412 			if (line6pcm->bytes_out >= line6pcm->period_out) {
413 				line6pcm->bytes_out %= line6pcm->period_out;
414 				snd_pcm_period_elapsed(substream);
415 			}
416 		}
417 	}
418 }
419 
420 /* open playback callback */
snd_line6_playback_open(struct snd_pcm_substream * substream)421 static int snd_line6_playback_open(struct snd_pcm_substream *substream)
422 {
423 	int err;
424 	struct snd_pcm_runtime *runtime = substream->runtime;
425 	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
426 
427 	err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
428 					    (&line6pcm->
429 					     properties->snd_line6_rates));
430 	if (err < 0)
431 		return err;
432 
433 	runtime->hw = line6pcm->properties->snd_line6_playback_hw;
434 	return 0;
435 }
436 
437 /* close playback callback */
snd_line6_playback_close(struct snd_pcm_substream * substream)438 static int snd_line6_playback_close(struct snd_pcm_substream *substream)
439 {
440 	return 0;
441 }
442 
443 /* hw_params playback callback */
snd_line6_playback_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)444 static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
445 					struct snd_pcm_hw_params *hw_params)
446 {
447 	int ret;
448 	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
449 
450 	/* -- Florian Demski [FD] */
451 	/* don't ask me why, but this fixes the bug on my machine */
452 	if (line6pcm == NULL) {
453 		if (substream->pcm == NULL)
454 			return -ENOMEM;
455 		if (substream->pcm->private_data == NULL)
456 			return -ENOMEM;
457 		substream->private_data = substream->pcm->private_data;
458 		line6pcm = snd_pcm_substream_chip(substream);
459 	}
460 	/* -- [FD] end */
461 
462 	ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
463 
464 	if (ret < 0)
465 		return ret;
466 
467 	ret = snd_pcm_lib_malloc_pages(substream,
468 				       params_buffer_bytes(hw_params));
469 	if (ret < 0) {
470 		line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
471 		return ret;
472 	}
473 
474 	line6pcm->period_out = params_period_bytes(hw_params);
475 	return 0;
476 }
477 
478 /* hw_free playback callback */
snd_line6_playback_hw_free(struct snd_pcm_substream * substream)479 static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
480 {
481 	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
482 	line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
483 	return snd_pcm_lib_free_pages(substream);
484 }
485 
486 /* trigger playback callback */
snd_line6_playback_trigger(struct snd_line6_pcm * line6pcm,int cmd)487 int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
488 {
489 	int err;
490 
491 	switch (cmd) {
492 	case SNDRV_PCM_TRIGGER_START:
493 #ifdef CONFIG_PM
494 	case SNDRV_PCM_TRIGGER_RESUME:
495 #endif
496 		err = line6_pcm_acquire(line6pcm,
497 					LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
498 
499 		if (err < 0)
500 			return err;
501 
502 		break;
503 
504 	case SNDRV_PCM_TRIGGER_STOP:
505 #ifdef CONFIG_PM
506 	case SNDRV_PCM_TRIGGER_SUSPEND:
507 #endif
508 		err = line6_pcm_release(line6pcm,
509 					LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
510 
511 		if (err < 0)
512 			return err;
513 
514 		break;
515 
516 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
517 		set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
518 		break;
519 
520 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
521 		clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
522 		break;
523 
524 	default:
525 		return -EINVAL;
526 	}
527 
528 	return 0;
529 }
530 
531 /* playback pointer callback */
532 static snd_pcm_uframes_t
snd_line6_playback_pointer(struct snd_pcm_substream * substream)533 snd_line6_playback_pointer(struct snd_pcm_substream *substream)
534 {
535 	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
536 	return line6pcm->pos_out_done;
537 }
538 
539 /* playback operators */
540 struct snd_pcm_ops snd_line6_playback_ops = {
541 	.open = snd_line6_playback_open,
542 	.close = snd_line6_playback_close,
543 	.ioctl = snd_pcm_lib_ioctl,
544 	.hw_params = snd_line6_playback_hw_params,
545 	.hw_free = snd_line6_playback_hw_free,
546 	.prepare = snd_line6_prepare,
547 	.trigger = snd_line6_trigger,
548 	.pointer = snd_line6_playback_pointer,
549 };
550 
line6_create_audio_out_urbs(struct snd_line6_pcm * line6pcm)551 int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
552 {
553 	int i;
554 
555 	/* create audio URBs and fill in constant values: */
556 	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
557 		struct urb *urb;
558 
559 		/* URB for audio out: */
560 		urb = line6pcm->urb_audio_out[i] =
561 		    usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
562 
563 		if (urb == NULL) {
564 			dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
565 			return -ENOMEM;
566 		}
567 
568 		urb->dev = line6pcm->line6->usbdev;
569 		urb->pipe =
570 		    usb_sndisocpipe(line6pcm->line6->usbdev,
571 				    line6pcm->ep_audio_write &
572 				    USB_ENDPOINT_NUMBER_MASK);
573 		urb->transfer_flags = URB_ISO_ASAP;
574 		urb->start_frame = -1;
575 		urb->number_of_packets = LINE6_ISO_PACKETS;
576 		urb->interval = LINE6_ISO_INTERVAL;
577 		urb->error_count = 0;
578 		urb->complete = audio_out_callback;
579 	}
580 
581 	return 0;
582 }
583