Root/drivers/staging/line6/capture.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
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                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*/
110void 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*/
134void 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*/
143void 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        len = runtime->buffer_size - line6pcm->pos_in_done;
161
162        if (len > 0) {
163            memcpy(runtime->dma_area +
164                   line6pcm->pos_in_done * bytes_per_frame, fbuf,
165                   len * bytes_per_frame);
166            memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
167                   (frames - len) * bytes_per_frame);
168        } else {
169            /* this is somewhat paranoid */
170            dev_err(line6pcm->line6->ifcdev,
171                "driver bug: len = %d\n", len);
172        }
173    } else {
174        /* copy single chunk */
175        memcpy(runtime->dma_area +
176               line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
177    }
178
179    line6pcm->pos_in_done += frames;
180    if (line6pcm->pos_in_done >= runtime->buffer_size)
181        line6pcm->pos_in_done -= runtime->buffer_size;
182}
183
184void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
185{
186    struct snd_pcm_substream *substream =
187        get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
188
189    line6pcm->bytes_in += length;
190    if (line6pcm->bytes_in >= line6pcm->period_in) {
191        line6pcm->bytes_in %= line6pcm->period_in;
192        snd_pcm_period_elapsed(substream);
193    }
194}
195
196void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
197{
198    kfree(line6pcm->buffer_in);
199    line6pcm->buffer_in = NULL;
200}
201
202/*
203 * Callback for completed capture URB.
204 */
205static void audio_in_callback(struct urb *urb)
206{
207    int i, index, length = 0, shutdown = 0;
208    unsigned long flags;
209
210    struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
211
212    line6pcm->last_frame_in = urb->start_frame;
213
214    /* find index of URB */
215    for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
216        if (urb == line6pcm->urb_audio_in[index])
217            break;
218
219#ifdef CONFIG_LINE6_USB_DUMP_PCM
220    for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
221        struct usb_iso_packet_descriptor *fout =
222            &urb->iso_frame_desc[i];
223        line6_write_hexdump(line6pcm->line6, 'C',
224                    urb->transfer_buffer + fout->offset,
225                    fout->length);
226    }
227#endif
228
229    spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
230
231    for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
232        char *fbuf;
233        int fsize;
234        struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
235
236        if (fin->status == -EXDEV) {
237            shutdown = 1;
238            break;
239        }
240
241        fbuf = urb->transfer_buffer + fin->offset;
242        fsize = fin->actual_length;
243
244        if (fsize > line6pcm->max_packet_size) {
245            dev_err(line6pcm->line6->ifcdev,
246                "driver and/or device bug: packet too large (%d > %d)\n",
247                fsize, line6pcm->max_packet_size);
248        }
249
250        length += fsize;
251
252        /* the following assumes LINE6_ISO_PACKETS == 1: */
253        line6pcm->prev_fbuf = fbuf;
254        line6pcm->prev_fsize = fsize;
255
256#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
257        if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
258#endif
259            if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, &line6pcm->flags)
260                && (fsize > 0))
261                line6_capture_copy(line6pcm, fbuf, fsize);
262    }
263
264    clear_bit(index, &line6pcm->active_urb_in);
265
266    if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
267        shutdown = 1;
268
269    spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
270
271    if (!shutdown) {
272        submit_audio_in_urb(line6pcm);
273
274#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
275        if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
276#endif
277            if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, &line6pcm->flags))
278                line6_capture_check_period(line6pcm, length);
279    }
280}
281
282/* open capture callback */
283static int snd_line6_capture_open(struct snd_pcm_substream *substream)
284{
285    int err;
286    struct snd_pcm_runtime *runtime = substream->runtime;
287    struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
288
289    err = snd_pcm_hw_constraint_ratdens(runtime, 0,
290                        SNDRV_PCM_HW_PARAM_RATE,
291                        (&line6pcm->
292                         properties->snd_line6_rates));
293    if (err < 0)
294        return err;
295
296    runtime->hw = line6pcm->properties->snd_line6_capture_hw;
297    return 0;
298}
299
300/* close capture callback */
301static int snd_line6_capture_close(struct snd_pcm_substream *substream)
302{
303    return 0;
304}
305
306/* hw_params capture callback */
307static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
308                       struct snd_pcm_hw_params *hw_params)
309{
310    int ret;
311    struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
312
313    /* -- Florian Demski [FD] */
314    /* don't ask me why, but this fixes the bug on my machine */
315    if (line6pcm == NULL) {
316        if (substream->pcm == NULL)
317            return -ENOMEM;
318        if (substream->pcm->private_data == NULL)
319            return -ENOMEM;
320        substream->private_data = substream->pcm->private_data;
321        line6pcm = snd_pcm_substream_chip(substream);
322    }
323    /* -- [FD] end */
324
325    ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
326
327    if (ret < 0)
328        return ret;
329
330    ret = snd_pcm_lib_malloc_pages(substream,
331                       params_buffer_bytes(hw_params));
332    if (ret < 0) {
333        line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
334        return ret;
335    }
336
337    line6pcm->period_in = params_period_bytes(hw_params);
338    return 0;
339}
340
341/* hw_free capture callback */
342static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
343{
344    struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
345    line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
346    return snd_pcm_lib_free_pages(substream);
347}
348
349/* trigger callback */
350int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
351{
352    int err;
353
354    switch (cmd) {
355    case SNDRV_PCM_TRIGGER_START:
356#ifdef CONFIG_PM
357    case SNDRV_PCM_TRIGGER_RESUME:
358#endif
359        err = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
360
361        if (err < 0)
362            return err;
363
364        break;
365
366    case SNDRV_PCM_TRIGGER_STOP:
367#ifdef CONFIG_PM
368    case SNDRV_PCM_TRIGGER_SUSPEND:
369#endif
370        err = line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
371
372        if (err < 0)
373            return err;
374
375        break;
376
377    default:
378        return -EINVAL;
379    }
380
381    return 0;
382}
383
384/* capture pointer callback */
385static snd_pcm_uframes_t
386snd_line6_capture_pointer(struct snd_pcm_substream *substream)
387{
388    struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
389    return line6pcm->pos_in_done;
390}
391
392/* capture operators */
393struct snd_pcm_ops snd_line6_capture_ops = {
394    .open = snd_line6_capture_open,
395    .close = snd_line6_capture_close,
396    .ioctl = snd_pcm_lib_ioctl,
397    .hw_params = snd_line6_capture_hw_params,
398    .hw_free = snd_line6_capture_hw_free,
399    .prepare = snd_line6_prepare,
400    .trigger = snd_line6_trigger,
401    .pointer = snd_line6_capture_pointer,
402};
403
404int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
405{
406    int i;
407
408    /* create audio URBs and fill in constant values: */
409    for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
410        struct urb *urb;
411
412        /* URB for audio in: */
413        urb = line6pcm->urb_audio_in[i] =
414            usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
415
416        if (urb == NULL) {
417            dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
418            return -ENOMEM;
419        }
420
421        urb->dev = line6pcm->line6->usbdev;
422        urb->pipe =
423            usb_rcvisocpipe(line6pcm->line6->usbdev,
424                    line6pcm->ep_audio_read &
425                    USB_ENDPOINT_NUMBER_MASK);
426        urb->transfer_flags = URB_ISO_ASAP;
427        urb->start_frame = -1;
428        urb->number_of_packets = LINE6_ISO_PACKETS;
429        urb->interval = LINE6_ISO_INTERVAL;
430        urb->error_count = 0;
431        urb->complete = audio_in_callback;
432    }
433
434    return 0;
435}
436

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