podhd.c

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/*
 * Line6 Pod HD
 *
 * Copyright (C) 2011 Stefan Hajnoczi <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License as
 *  published by the Free Software Foundation, version 2.
 *
 */

#include <sound/core.h>
#include <sound/pcm.h>

#include "audio.h"
#include "driver.h"
#include "pcm.h"
#include "podhd.h"

#define PODHD_BYTES_PER_FRAME 6 /* 24bit audio (stereo) */

static struct snd_ratden podhd_ratden = {
    .num_min = 48000,
    .num_max = 48000,
    .num_step = 1,
    .den = 1,
};

static struct line6_pcm_properties podhd_pcm_properties = {
    .snd_line6_playback_hw = {
                  .info = (SNDRV_PCM_INFO_MMAP |
                       SNDRV_PCM_INFO_INTERLEAVED |
                       SNDRV_PCM_INFO_BLOCK_TRANSFER |
                       SNDRV_PCM_INFO_MMAP_VALID |
                       SNDRV_PCM_INFO_PAUSE |
#ifdef CONFIG_PM
                       SNDRV_PCM_INFO_RESUME |
#endif
                       SNDRV_PCM_INFO_SYNC_START),
                  .formats = SNDRV_PCM_FMTBIT_S24_3LE,
                  .rates = SNDRV_PCM_RATE_48000,
                  .rate_min = 48000,
                  .rate_max = 48000,
                  .channels_min = 2,
                  .channels_max = 2,
                  .buffer_bytes_max = 60000,
                  .period_bytes_min = 64,
                  .period_bytes_max = 8192,
                  .periods_min = 1,
                  .periods_max = 1024},
    .snd_line6_capture_hw = {
                 .info = (SNDRV_PCM_INFO_MMAP |
                      SNDRV_PCM_INFO_INTERLEAVED |
                      SNDRV_PCM_INFO_BLOCK_TRANSFER |
                      SNDRV_PCM_INFO_MMAP_VALID |
#ifdef CONFIG_PM
                      SNDRV_PCM_INFO_RESUME |
#endif
                      SNDRV_PCM_INFO_SYNC_START),
                 .formats = SNDRV_PCM_FMTBIT_S24_3LE,
                 .rates = SNDRV_PCM_RATE_48000,
                 .rate_min = 48000,
                 .rate_max = 48000,
                 .channels_min = 2,
                 .channels_max = 2,
                 .buffer_bytes_max = 60000,
                 .period_bytes_min = 64,
                 .period_bytes_max = 8192,
                 .periods_min = 1,
                 .periods_max = 1024},
    .snd_line6_rates = {
                .nrats = 1,
                .rats = &podhd_ratden},
    .bytes_per_frame = PODHD_BYTES_PER_FRAME
};

/*
    POD HD destructor.
*/
static void podhd_destruct(struct usb_interface *interface)
{
    struct usb_line6_podhd *podhd = usb_get_intfdata(interface);

    if (podhd == NULL)
        return;
    line6_cleanup_audio(&podhd->line6);
}

/*
    Try to init POD HD device.
*/
static int podhd_try_init(struct usb_interface *interface,
              struct usb_line6_podhd *podhd)
{
    int err;
    struct usb_line6 *line6 = &podhd->line6;

    if ((interface == NULL) || (podhd == NULL))
        return -ENODEV;

    /* initialize audio system: */
    err = line6_init_audio(line6);
    if (err < 0)
        return err;

    /* initialize MIDI subsystem: */
    err = line6_init_midi(line6);
    if (err < 0)
        return err;

    /* initialize PCM subsystem: */
    err = line6_init_pcm(line6, &podhd_pcm_properties);
    if (err < 0)
        return err;

    /* register USB audio system: */
    err = line6_register_audio(line6);
    return err;
}

/*
    Init POD HD device (and clean up in case of failure).
*/
int line6_podhd_init(struct usb_interface *interface,
             struct usb_line6_podhd *podhd)
{
    int err = podhd_try_init(interface, podhd);

    if (err < 0)
        podhd_destruct(interface);

    return err;
}

/*
    POD HD device disconnected.
*/
void line6_podhd_disconnect(struct usb_interface *interface)
{
    struct usb_line6_podhd *podhd;

    if (interface == NULL)
        return;
    podhd = usb_get_intfdata(interface);

    if (podhd != NULL) {
        struct snd_line6_pcm *line6pcm = podhd->line6.line6pcm;

        if (line6pcm != NULL)
            line6_pcm_disconnect(line6pcm);
    }

    podhd_destruct(interface);
}