LXR linux/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        spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
 220
 221        for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 222                char *fbuf;
 223                int fsize;
 224                struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 225
 226                if (fin->status == -EXDEV) {
 227                        shutdown = 1;
 228                        break;
 229                }
 230
 231                fbuf = urb->transfer_buffer + fin->offset;
 232                fsize = fin->actual_length;
 233
 234                if (fsize > line6pcm->max_packet_size) {
 235                        dev_err(line6pcm->line6->ifcdev,
 236                                "driver and/or device bug: packet too large (%d > %d)\n",
 237                                fsize, line6pcm->max_packet_size);
 238                }
 239
 240                length += fsize;
 241
 242                /* the following assumes LINE6_ISO_PACKETS == 1: */
 243                line6pcm->prev_fbuf = fbuf;
 244                line6pcm->prev_fsize = fsize;
 245
 246#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 247                if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
 248#endif
 249                        if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
 250                                     &line6pcm->flags) && (fsize > 0))
 251                                line6_capture_copy(line6pcm, fbuf, fsize);
 252        }
 253
 254        clear_bit(index, &line6pcm->active_urb_in);
 255
 256        if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
 257                shutdown = 1;
 258
 259        spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
 260
 261        if (!shutdown) {
 262                submit_audio_in_urb(line6pcm);
 263
 264#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 265                if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
 266#endif
 267                        if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
 268                                     &line6pcm->flags))
 269                                line6_capture_check_period(line6pcm, length);
 270        }
 271}
 272
 273/* open capture callback */
 274static int snd_line6_capture_open(struct snd_pcm_substream *substream)
 275{
 276        int err;
 277        struct snd_pcm_runtime *runtime = substream->runtime;
 278        struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 279
 280        err = snd_pcm_hw_constraint_ratdens(runtime, 0,
 281                                            SNDRV_PCM_HW_PARAM_RATE,
 282                                            (&line6pcm->
 283                                             properties->snd_line6_rates));
 284        if (err < 0)
 285                return err;
 286
 287        runtime->hw = line6pcm->properties->snd_line6_capture_hw;
 288        return 0;
 289}
 290
 291/* close capture callback */
 292static int snd_line6_capture_close(struct snd_pcm_substream *substream)
 293{
 294        return 0;
 295}
 296
 297/* hw_params capture callback */
 298static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
 299                                       struct snd_pcm_hw_params *hw_params)
 300{
 301        int ret;
 302        struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 303
 304        /* -- Florian Demski [FD] */
 305        /* don't ask me why, but this fixes the bug on my machine */
 306        if (line6pcm == NULL) {
 307                if (substream->pcm == NULL)
 308                        return -ENOMEM;
 309                if (substream->pcm->private_data == NULL)
 310                        return -ENOMEM;
 311                substream->private_data = substream->pcm->private_data;
 312                line6pcm = snd_pcm_substream_chip(substream);
 313        }
 314        /* -- [FD] end */
 315
 316        ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 317
 318        if (ret < 0)
 319                return ret;
 320
 321        ret = snd_pcm_lib_malloc_pages(substream,
 322                                       params_buffer_bytes(hw_params));
 323        if (ret < 0) {
 324                line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 325                return ret;
 326        }
 327
 328        line6pcm->period_in = params_period_bytes(hw_params);
 329        return 0;
 330}
 331
 332/* hw_free capture callback */
 333static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 334{
 335        struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 336        line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 337        return snd_pcm_lib_free_pages(substream);
 338}
 339
 340/* trigger callback */
 341int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
 342{
 343        int err;
 344
 345        switch (cmd) {
 346        case SNDRV_PCM_TRIGGER_START:
 347#ifdef CONFIG_PM
 348        case SNDRV_PCM_TRIGGER_RESUME:
 349#endif
 350                err = line6_pcm_acquire(line6pcm,
 351                                        LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
 352
 353                if (err < 0)
 354                        return err;
 355
 356                break;
 357
 358        case SNDRV_PCM_TRIGGER_STOP:
 359#ifdef CONFIG_PM
 360        case SNDRV_PCM_TRIGGER_SUSPEND:
 361#endif
 362                err = line6_pcm_release(line6pcm,
 363                                        LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
 364
 365                if (err < 0)
 366                        return err;
 367
 368                break;
 369
 370        default:
 371                return -EINVAL;
 372        }
 373
 374        return 0;
 375}
 376
 377/* capture pointer callback */
 378static snd_pcm_uframes_t
 379snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 380{
 381        struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 382        return line6pcm->pos_in_done;
 383}
 384
 385/* capture operators */
 386struct snd_pcm_ops snd_line6_capture_ops = {
 387        .open = snd_line6_capture_open,
 388        .close = snd_line6_capture_close,
 389        .ioctl = snd_pcm_lib_ioctl,
 390        .hw_params = snd_line6_capture_hw_params,
 391        .hw_free = snd_line6_capture_hw_free,
 392        .prepare = snd_line6_prepare,
 393        .trigger = snd_line6_trigger,
 394        .pointer = snd_line6_capture_pointer,
 395};
 396
 397int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 398{
 399        int i;
 400
 401        /* create audio URBs and fill in constant values: */
 402        for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 403                struct urb *urb;
 404
 405                /* URB for audio in: */
 406                urb = line6pcm->urb_audio_in[i] =
 407                    usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 408
 409                if (urb == NULL) {
 410                        dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 411                        return -ENOMEM;
 412                }
 413
 414                urb->dev = line6pcm->line6->usbdev;
 415                urb->pipe =
 416                    usb_rcvisocpipe(line6pcm->line6->usbdev,
 417                                    line6pcm->ep_audio_read &
 418                                    USB_ENDPOINT_NUMBER_MASK);
 419                urb->transfer_flags = URB_ISO_ASAP;
 420                urb->start_frame = -1;
 421                urb->number_of_packets = LINE6_ISO_PACKETS;
 422                urb->interval = LINE6_ISO_INTERVAL;
 423                urb->error_count = 0;
 424                urb->complete = audio_in_callback;
 425        }
 426
 427        return 0;
 428}
 429