Root/drivers/staging/line6/playback.c

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*/
27static 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*/
66static 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*/
111static 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*/
136static 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"); /* this is somewhat paranoid */
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", len); /* this is somewhat paranoid */
222        } else {
223            memcpy(urb_out->transfer_buffer,
224                   runtime->dma_area +
225                   line6pcm->pos_out * bytes_per_frame,
226                   urb_out->transfer_buffer_length);
227        }
228
229        line6pcm->pos_out += urb_frames;
230        if (line6pcm->pos_out >= runtime->buffer_size)
231            line6pcm->pos_out -= runtime->buffer_size;
232    } else {
233        memset(urb_out->transfer_buffer, 0,
234               urb_out->transfer_buffer_length);
235    }
236
237    change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
238
239    if (line6pcm->prev_fbuf != NULL) {
240#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
241        if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
242            create_impulse_test_signal(line6pcm, urb_out,
243                           bytes_per_frame);
244            if (line6pcm->flags & LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
245                line6_capture_copy(line6pcm,
246                           urb_out->transfer_buffer,
247                           urb_out->
248                           transfer_buffer_length);
249                line6_capture_check_period(line6pcm,
250                               urb_out->transfer_buffer_length);
251            }
252        } else {
253#endif
254            if (!
255                (line6pcm->line6->
256                 properties->capabilities & LINE6_BIT_HWMON)
257                && (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
258                && (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
259                add_monitor_signal(urb_out, line6pcm->prev_fbuf,
260                           line6pcm->volume_monitor,
261                           bytes_per_frame);
262#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
263        }
264#endif
265    }
266#ifdef CONFIG_LINE6_USB_DUMP_PCM
267    for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
268        struct usb_iso_packet_descriptor *fout =
269            &urb_out->iso_frame_desc[i];
270        line6_write_hexdump(line6pcm->line6, 'P',
271                    urb_out->transfer_buffer + fout->offset,
272                    fout->length);
273    }
274#endif
275
276    ret = usb_submit_urb(urb_out, GFP_ATOMIC);
277
278    if (ret == 0)
279        set_bit(index, &line6pcm->active_urb_out);
280    else
281        dev_err(line6pcm->line6->ifcdev,
282            "URB out #%d submission failed (%d)\n", index, ret);
283
284    spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
285    return 0;
286}
287
288/*
289    Submit all currently available playback URBs.
290*/
291int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
292{
293    int ret, i;
294
295    for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
296        ret = submit_audio_out_urb(line6pcm);
297        if (ret < 0)
298            return ret;
299    }
300
301    return 0;
302}
303
304/*
305    Unlink all currently active playback URBs.
306*/
307void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
308{
309    unsigned int i;
310
311    for (i = LINE6_ISO_BUFFERS; i--;) {
312        if (test_bit(i, &line6pcm->active_urb_out)) {
313            if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
314                struct urb *u = line6pcm->urb_audio_out[i];
315                usb_unlink_urb(u);
316            }
317        }
318    }
319}
320
321/*
322    Wait until unlinking of all currently active playback URBs has been finished.
323*/
324void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
325{
326    int timeout = HZ;
327    unsigned int i;
328    int alive;
329
330    do {
331        alive = 0;
332        for (i = LINE6_ISO_BUFFERS; i--;) {
333            if (test_bit(i, &line6pcm->active_urb_out))
334                alive++;
335        }
336        if (!alive)
337            break;
338        set_current_state(TASK_UNINTERRUPTIBLE);
339        schedule_timeout(1);
340    } while (--timeout > 0);
341    if (alive)
342        snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
343}
344
345/*
346    Unlink all currently active playback URBs, and wait for finishing.
347*/
348void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
349{
350    line6_unlink_audio_out_urbs(line6pcm);
351    line6_wait_clear_audio_out_urbs(line6pcm);
352}
353
354void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
355{
356    kfree(line6pcm->buffer_out);
357    line6pcm->buffer_out = NULL;
358}
359
360/*
361    Callback for completed playback URB.
362*/
363static void audio_out_callback(struct urb *urb)
364{
365    int i, index, length = 0, shutdown = 0;
366    unsigned long flags;
367
368    struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
369    struct snd_pcm_substream *substream =
370        get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
371
372#if USE_CLEAR_BUFFER_WORKAROUND
373    memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
374#endif
375
376    line6pcm->last_frame_out = urb->start_frame;
377
378    /* find index of URB */
379    for (index = LINE6_ISO_BUFFERS; index--;)
380        if (urb == line6pcm->urb_audio_out[index])
381            break;
382
383    if (index < 0)
384        return; /* URB has been unlinked asynchronously */
385
386    for (i = LINE6_ISO_PACKETS; i--;)
387        length += urb->iso_frame_desc[i].length;
388
389    spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
390
391    if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
392        struct snd_pcm_runtime *runtime = substream->runtime;
393        line6pcm->pos_out_done +=
394            length / line6pcm->properties->bytes_per_frame;
395
396        if (line6pcm->pos_out_done >= runtime->buffer_size)
397            line6pcm->pos_out_done -= runtime->buffer_size;
398    }
399
400    clear_bit(index, &line6pcm->active_urb_out);
401
402    for (i = LINE6_ISO_PACKETS; i--;)
403        if (urb->iso_frame_desc[i].status == -EXDEV) {
404            shutdown = 1;
405            break;
406        }
407
408    if (test_and_clear_bit(index, &line6pcm->unlink_urb_out))
409        shutdown = 1;
410
411    spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
412
413    if (!shutdown) {
414        submit_audio_out_urb(line6pcm);
415
416        if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
417            line6pcm->bytes_out += length;
418            if (line6pcm->bytes_out >= line6pcm->period_out) {
419                line6pcm->bytes_out %= line6pcm->period_out;
420                snd_pcm_period_elapsed(substream);
421            }
422        }
423    }
424}
425
426/* open playback callback */
427static int snd_line6_playback_open(struct snd_pcm_substream *substream)
428{
429    int err;
430    struct snd_pcm_runtime *runtime = substream->runtime;
431    struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
432
433    err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
434                        (&line6pcm->
435                         properties->snd_line6_rates));
436    if (err < 0)
437        return err;
438
439    runtime->hw = line6pcm->properties->snd_line6_playback_hw;
440    return 0;
441}
442
443/* close playback callback */
444static int snd_line6_playback_close(struct snd_pcm_substream *substream)
445{
446    return 0;
447}
448
449/* hw_params playback callback */
450static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
451                    struct snd_pcm_hw_params *hw_params)
452{
453    int ret;
454    struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
455
456    /* -- Florian Demski [FD] */
457    /* don't ask me why, but this fixes the bug on my machine */
458    if (line6pcm == NULL) {
459        if (substream->pcm == NULL)
460            return -ENOMEM;
461        if (substream->pcm->private_data == NULL)
462            return -ENOMEM;
463        substream->private_data = substream->pcm->private_data;
464        line6pcm = snd_pcm_substream_chip(substream);
465    }
466    /* -- [FD] end */
467
468    ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
469
470    if (ret < 0)
471        return ret;
472
473    ret = snd_pcm_lib_malloc_pages(substream,
474                       params_buffer_bytes(hw_params));
475    if (ret < 0) {
476        line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
477        return ret;
478    }
479
480    line6pcm->period_out = params_period_bytes(hw_params);
481    return 0;
482}
483
484/* hw_free playback callback */
485static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
486{
487    struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
488    line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
489    return snd_pcm_lib_free_pages(substream);
490}
491
492/* trigger playback callback */
493int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
494{
495    int err;
496
497    switch (cmd) {
498    case SNDRV_PCM_TRIGGER_START:
499#ifdef CONFIG_PM
500    case SNDRV_PCM_TRIGGER_RESUME:
501#endif
502        err = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
503
504        if (err < 0)
505            return err;
506
507        break;
508
509    case SNDRV_PCM_TRIGGER_STOP:
510#ifdef CONFIG_PM
511    case SNDRV_PCM_TRIGGER_SUSPEND:
512#endif
513        err = line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
514
515        if (err < 0)
516            return err;
517
518        break;
519
520    case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
521        set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
522        break;
523
524    case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
525        clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
526        break;
527
528    default:
529        return -EINVAL;
530    }
531
532    return 0;
533}
534
535/* playback pointer callback */
536static snd_pcm_uframes_t
537snd_line6_playback_pointer(struct snd_pcm_substream *substream)
538{
539    struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
540    return line6pcm->pos_out_done;
541}
542
543/* playback operators */
544struct snd_pcm_ops snd_line6_playback_ops = {
545    .open = snd_line6_playback_open,
546    .close = snd_line6_playback_close,
547    .ioctl = snd_pcm_lib_ioctl,
548    .hw_params = snd_line6_playback_hw_params,
549    .hw_free = snd_line6_playback_hw_free,
550    .prepare = snd_line6_prepare,
551    .trigger = snd_line6_trigger,
552    .pointer = snd_line6_playback_pointer,
553};
554
555int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
556{
557    int i;
558
559    /* create audio URBs and fill in constant values: */
560    for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
561        struct urb *urb;
562
563        /* URB for audio out: */
564        urb = line6pcm->urb_audio_out[i] =
565            usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
566
567        if (urb == NULL) {
568            dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
569            return -ENOMEM;
570        }
571
572        urb->dev = line6pcm->line6->usbdev;
573        urb->pipe =
574            usb_sndisocpipe(line6pcm->line6->usbdev,
575                    line6pcm->ep_audio_write &
576                    USB_ENDPOINT_NUMBER_MASK);
577        urb->transfer_flags = URB_ISO_ASAP;
578        urb->start_frame = -1;
579        urb->number_of_packets = LINE6_ISO_PACKETS;
580        urb->interval = LINE6_ISO_INTERVAL;
581        urb->error_count = 0;
582        urb->complete = audio_out_callback;
583    }
584
585    return 0;
586}
587

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