621 lines
16 KiB
C
621 lines
16 KiB
C
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/*
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* Line 6 Linux USB driver
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*
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* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include "capture.h"
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#include "driver.h"
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#include "playback.h"
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/* impulse response volume controls */
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static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
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uinfo->count = 1;
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uinfo->value.integer.min = 0;
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uinfo->value.integer.max = 255;
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return 0;
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}
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static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
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ucontrol->value.integer.value[0] = line6pcm->impulse_volume;
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return 0;
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}
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static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
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int value = ucontrol->value.integer.value[0];
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int err;
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if (line6pcm->impulse_volume == value)
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return 0;
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line6pcm->impulse_volume = value;
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if (value > 0) {
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err = line6_pcm_acquire(line6pcm, LINE6_STREAM_IMPULSE, true);
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if (err < 0) {
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line6pcm->impulse_volume = 0;
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return err;
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}
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} else {
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line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
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}
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return 1;
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}
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/* impulse response period controls */
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static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
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uinfo->count = 1;
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uinfo->value.integer.min = 0;
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uinfo->value.integer.max = 2000;
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return 0;
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}
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static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
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ucontrol->value.integer.value[0] = line6pcm->impulse_period;
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return 0;
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}
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static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
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int value = ucontrol->value.integer.value[0];
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if (line6pcm->impulse_period == value)
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return 0;
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line6pcm->impulse_period = value;
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return 1;
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}
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/*
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Unlink all currently active URBs.
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*/
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static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm,
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struct line6_pcm_stream *pcms)
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{
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int i;
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for (i = 0; i < line6pcm->line6->iso_buffers; i++) {
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if (test_bit(i, &pcms->active_urbs)) {
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if (!test_and_set_bit(i, &pcms->unlink_urbs))
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usb_unlink_urb(pcms->urbs[i]);
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}
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}
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}
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/*
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Wait until unlinking of all currently active URBs has been finished.
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*/
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static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
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struct line6_pcm_stream *pcms)
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{
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int timeout = HZ;
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int i;
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int alive;
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do {
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alive = 0;
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for (i = 0; i < line6pcm->line6->iso_buffers; i++) {
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if (test_bit(i, &pcms->active_urbs))
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alive++;
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}
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if (!alive)
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break;
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set_current_state(TASK_UNINTERRUPTIBLE);
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schedule_timeout(1);
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} while (--timeout > 0);
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if (alive)
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dev_err(line6pcm->line6->ifcdev,
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"timeout: still %d active urbs..\n", alive);
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}
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static inline struct line6_pcm_stream *
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get_stream(struct snd_line6_pcm *line6pcm, int direction)
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{
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return (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
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&line6pcm->out : &line6pcm->in;
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}
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/* allocate a buffer if not opened yet;
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* call this in line6pcm.state_mutex
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*/
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static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
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struct line6_pcm_stream *pstr, int direction, int type)
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{
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const int pkt_size =
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(direction == SNDRV_PCM_STREAM_PLAYBACK) ?
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line6pcm->max_packet_size_out :
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line6pcm->max_packet_size_in;
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/* Invoked multiple times in a row so allocate once only */
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if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) {
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pstr->buffer =
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kmalloc(array3_size(line6pcm->line6->iso_buffers,
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LINE6_ISO_PACKETS, pkt_size),
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GFP_KERNEL);
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if (!pstr->buffer)
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return -ENOMEM;
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}
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return 0;
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}
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/* free a buffer if all streams are closed;
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* call this in line6pcm.state_mutex
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*/
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static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
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struct line6_pcm_stream *pstr, int type)
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{
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clear_bit(type, &pstr->opened);
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if (!pstr->opened) {
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line6_wait_clear_audio_urbs(line6pcm, pstr);
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kfree(pstr->buffer);
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pstr->buffer = NULL;
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}
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}
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/* start a PCM stream */
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static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
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int type)
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{
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unsigned long flags;
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struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
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int ret = 0;
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spin_lock_irqsave(&pstr->lock, flags);
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if (!test_and_set_bit(type, &pstr->running) &&
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!(pstr->active_urbs || pstr->unlink_urbs)) {
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pstr->count = 0;
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/* Submit all currently available URBs */
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if (direction == SNDRV_PCM_STREAM_PLAYBACK)
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ret = line6_submit_audio_out_all_urbs(line6pcm);
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else
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ret = line6_submit_audio_in_all_urbs(line6pcm);
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}
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if (ret < 0)
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clear_bit(type, &pstr->running);
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spin_unlock_irqrestore(&pstr->lock, flags);
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return ret;
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}
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/* stop a PCM stream; this doesn't sync with the unlinked URBs */
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static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
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int type)
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{
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unsigned long flags;
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struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
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spin_lock_irqsave(&pstr->lock, flags);
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clear_bit(type, &pstr->running);
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if (!pstr->running) {
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spin_unlock_irqrestore(&pstr->lock, flags);
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line6_unlink_audio_urbs(line6pcm, pstr);
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spin_lock_irqsave(&pstr->lock, flags);
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if (direction == SNDRV_PCM_STREAM_CAPTURE) {
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line6pcm->prev_fbuf = NULL;
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line6pcm->prev_fsize = 0;
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}
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}
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spin_unlock_irqrestore(&pstr->lock, flags);
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}
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/* common PCM trigger callback */
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int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
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struct snd_pcm_substream *s;
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int err;
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clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);
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snd_pcm_group_for_each_entry(s, substream) {
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if (s->pcm->card != substream->pcm->card)
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continue;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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if (s->stream == SNDRV_PCM_STREAM_CAPTURE &&
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(line6pcm->line6->properties->capabilities &
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LINE6_CAP_IN_NEEDS_OUT)) {
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err = line6_stream_start(line6pcm, SNDRV_PCM_STREAM_PLAYBACK,
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LINE6_STREAM_CAPTURE_HELPER);
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if (err < 0)
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return err;
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}
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err = line6_stream_start(line6pcm, s->stream,
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LINE6_STREAM_PCM);
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if (err < 0)
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return err;
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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if (s->stream == SNDRV_PCM_STREAM_CAPTURE &&
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(line6pcm->line6->properties->capabilities &
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LINE6_CAP_IN_NEEDS_OUT)) {
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line6_stream_stop(line6pcm, SNDRV_PCM_STREAM_PLAYBACK,
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LINE6_STREAM_CAPTURE_HELPER);
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}
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line6_stream_stop(line6pcm, s->stream,
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LINE6_STREAM_PCM);
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break;
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
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return -EINVAL;
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set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
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break;
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
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return -EINVAL;
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clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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/* common PCM pointer callback */
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snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
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struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
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return pstr->pos_done;
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}
|
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|
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|
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/* Acquire and optionally start duplex streams:
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|
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* type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
|
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*/
|
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|
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int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type, bool start)
|
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|
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{
|
||
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struct line6_pcm_stream *pstr;
|
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int ret = 0, dir;
|
||
|
|
|
||
|
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/* TODO: We should assert SNDRV_PCM_STREAM_PLAYBACK/CAPTURE == 0/1 */
|
||
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mutex_lock(&line6pcm->state_mutex);
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for (dir = 0; dir < 2; dir++) {
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||
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pstr = get_stream(line6pcm, dir);
|
||
|
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ret = line6_buffer_acquire(line6pcm, pstr, dir, type);
|
||
|
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if (ret < 0)
|
||
|
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goto error;
|
||
|
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if (!pstr->running)
|
||
|
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line6_wait_clear_audio_urbs(line6pcm, pstr);
|
||
|
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}
|
||
|
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if (start) {
|
||
|
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for (dir = 0; dir < 2; dir++) {
|
||
|
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ret = line6_stream_start(line6pcm, dir, type);
|
||
|
|
if (ret < 0)
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
error:
|
||
|
|
mutex_unlock(&line6pcm->state_mutex);
|
||
|
|
if (ret < 0)
|
||
|
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line6_pcm_release(line6pcm, type);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(line6_pcm_acquire);
|
||
|
|
|
||
|
|
/* Stop and release duplex streams */
|
||
|
|
void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
|
||
|
|
{
|
||
|
|
struct line6_pcm_stream *pstr;
|
||
|
|
int dir;
|
||
|
|
|
||
|
|
mutex_lock(&line6pcm->state_mutex);
|
||
|
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for (dir = 0; dir < 2; dir++)
|
||
|
|
line6_stream_stop(line6pcm, dir, type);
|
||
|
|
for (dir = 0; dir < 2; dir++) {
|
||
|
|
pstr = get_stream(line6pcm, dir);
|
||
|
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line6_buffer_release(line6pcm, pstr, type);
|
||
|
|
}
|
||
|
|
mutex_unlock(&line6pcm->state_mutex);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(line6_pcm_release);
|
||
|
|
|
||
|
|
/* common PCM hw_params callback */
|
||
|
|
int snd_line6_hw_params(struct snd_pcm_substream *substream,
|
||
|
|
struct snd_pcm_hw_params *hw_params)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
|
||
|
|
struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
|
||
|
|
|
||
|
|
mutex_lock(&line6pcm->state_mutex);
|
||
|
|
ret = line6_buffer_acquire(line6pcm, pstr, substream->stream,
|
||
|
|
LINE6_STREAM_PCM);
|
||
|
|
if (ret < 0)
|
||
|
|
goto error;
|
||
|
|
|
||
|
|
ret = snd_pcm_lib_malloc_pages(substream,
|
||
|
|
params_buffer_bytes(hw_params));
|
||
|
|
if (ret < 0) {
|
||
|
|
line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
|
||
|
|
pstr->period = params_period_bytes(hw_params);
|
||
|
|
error:
|
||
|
|
mutex_unlock(&line6pcm->state_mutex);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* common PCM hw_free callback */
|
||
|
|
int snd_line6_hw_free(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
|
||
|
|
struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
|
||
|
|
|
||
|
|
mutex_lock(&line6pcm->state_mutex);
|
||
|
|
line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
|
||
|
|
mutex_unlock(&line6pcm->state_mutex);
|
||
|
|
return snd_pcm_lib_free_pages(substream);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* control info callback */
|
||
|
|
static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
|
||
|
|
struct snd_ctl_elem_info *uinfo)
|
||
|
|
{
|
||
|
|
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
|
||
|
|
uinfo->count = 2;
|
||
|
|
uinfo->value.integer.min = 0;
|
||
|
|
uinfo->value.integer.max = 256;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* control get callback */
|
||
|
|
static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
|
||
|
|
struct snd_ctl_elem_value *ucontrol)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
|
||
|
|
|
||
|
|
for (i = 0; i < 2; i++)
|
||
|
|
ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* control put callback */
|
||
|
|
static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
|
||
|
|
struct snd_ctl_elem_value *ucontrol)
|
||
|
|
{
|
||
|
|
int i, changed = 0;
|
||
|
|
struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
|
||
|
|
|
||
|
|
for (i = 0; i < 2; i++)
|
||
|
|
if (line6pcm->volume_playback[i] !=
|
||
|
|
ucontrol->value.integer.value[i]) {
|
||
|
|
line6pcm->volume_playback[i] =
|
||
|
|
ucontrol->value.integer.value[i];
|
||
|
|
changed = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return changed;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* control definition */
|
||
|
|
static const struct snd_kcontrol_new line6_controls[] = {
|
||
|
|
{
|
||
|
|
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
|
||
|
|
.name = "PCM Playback Volume",
|
||
|
|
.info = snd_line6_control_playback_info,
|
||
|
|
.get = snd_line6_control_playback_get,
|
||
|
|
.put = snd_line6_control_playback_put
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
|
||
|
|
.name = "Impulse Response Volume",
|
||
|
|
.info = snd_line6_impulse_volume_info,
|
||
|
|
.get = snd_line6_impulse_volume_get,
|
||
|
|
.put = snd_line6_impulse_volume_put
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
|
||
|
|
.name = "Impulse Response Period",
|
||
|
|
.info = snd_line6_impulse_period_info,
|
||
|
|
.get = snd_line6_impulse_period_get,
|
||
|
|
.put = snd_line6_impulse_period_put
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
Cleanup the PCM device.
|
||
|
|
*/
|
||
|
|
static void cleanup_urbs(struct line6_pcm_stream *pcms, int iso_buffers)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* Most likely impossible in current code... */
|
||
|
|
if (pcms->urbs == NULL)
|
||
|
|
return;
|
||
|
|
|
||
|
|
for (i = 0; i < iso_buffers; i++) {
|
||
|
|
if (pcms->urbs[i]) {
|
||
|
|
usb_kill_urb(pcms->urbs[i]);
|
||
|
|
usb_free_urb(pcms->urbs[i]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
kfree(pcms->urbs);
|
||
|
|
pcms->urbs = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void line6_cleanup_pcm(struct snd_pcm *pcm)
|
||
|
|
{
|
||
|
|
struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
|
||
|
|
|
||
|
|
cleanup_urbs(&line6pcm->out, line6pcm->line6->iso_buffers);
|
||
|
|
cleanup_urbs(&line6pcm->in, line6pcm->line6->iso_buffers);
|
||
|
|
kfree(line6pcm);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* create a PCM device */
|
||
|
|
static int snd_line6_new_pcm(struct usb_line6 *line6, struct snd_pcm **pcm_ret)
|
||
|
|
{
|
||
|
|
struct snd_pcm *pcm;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = snd_pcm_new(line6->card, (char *)line6->properties->name,
|
||
|
|
0, 1, 1, pcm_ret);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
pcm = *pcm_ret;
|
||
|
|
strcpy(pcm->name, line6->properties->name);
|
||
|
|
|
||
|
|
/* set operators */
|
||
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
|
||
|
|
&snd_line6_playback_ops);
|
||
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
|
||
|
|
|
||
|
|
/* pre-allocation of buffers */
|
||
|
|
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
|
||
|
|
snd_dma_continuous_data
|
||
|
|
(GFP_KERNEL), 64 * 1024,
|
||
|
|
128 * 1024);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Sync with PCM stream stops.
|
||
|
|
*/
|
||
|
|
void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
|
||
|
|
{
|
||
|
|
line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
|
||
|
|
line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
|
||
|
|
line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
|
||
|
|
line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Create and register the PCM device and mixer entries.
|
||
|
|
Create URBs for playback and capture.
|
||
|
|
*/
|
||
|
|
int line6_init_pcm(struct usb_line6 *line6,
|
||
|
|
struct line6_pcm_properties *properties)
|
||
|
|
{
|
||
|
|
int i, err;
|
||
|
|
unsigned ep_read = line6->properties->ep_audio_r;
|
||
|
|
unsigned ep_write = line6->properties->ep_audio_w;
|
||
|
|
struct snd_pcm *pcm;
|
||
|
|
struct snd_line6_pcm *line6pcm;
|
||
|
|
|
||
|
|
if (!(line6->properties->capabilities & LINE6_CAP_PCM))
|
||
|
|
return 0; /* skip PCM initialization and report success */
|
||
|
|
|
||
|
|
err = snd_line6_new_pcm(line6, &pcm);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
|
||
|
|
if (!line6pcm)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
mutex_init(&line6pcm->state_mutex);
|
||
|
|
line6pcm->pcm = pcm;
|
||
|
|
line6pcm->properties = properties;
|
||
|
|
line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
|
||
|
|
line6pcm->volume_monitor = 255;
|
||
|
|
line6pcm->line6 = line6;
|
||
|
|
|
||
|
|
spin_lock_init(&line6pcm->out.lock);
|
||
|
|
spin_lock_init(&line6pcm->in.lock);
|
||
|
|
line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
|
||
|
|
|
||
|
|
line6->line6pcm = line6pcm;
|
||
|
|
|
||
|
|
pcm->private_data = line6pcm;
|
||
|
|
pcm->private_free = line6_cleanup_pcm;
|
||
|
|
|
||
|
|
line6pcm->max_packet_size_in =
|
||
|
|
usb_maxpacket(line6->usbdev,
|
||
|
|
usb_rcvisocpipe(line6->usbdev, ep_read), 0);
|
||
|
|
line6pcm->max_packet_size_out =
|
||
|
|
usb_maxpacket(line6->usbdev,
|
||
|
|
usb_sndisocpipe(line6->usbdev, ep_write), 1);
|
||
|
|
if (!line6pcm->max_packet_size_in || !line6pcm->max_packet_size_out) {
|
||
|
|
dev_err(line6pcm->line6->ifcdev,
|
||
|
|
"cannot get proper max packet size\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
err = line6_create_audio_out_urbs(line6pcm);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
err = line6_create_audio_in_urbs(line6pcm);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
/* mixer: */
|
||
|
|
for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
|
||
|
|
err = snd_ctl_add(line6->card,
|
||
|
|
snd_ctl_new1(&line6_controls[i], line6pcm));
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(line6_init_pcm);
|
||
|
|
|
||
|
|
/* prepare pcm callback */
|
||
|
|
int snd_line6_prepare(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
|
||
|
|
struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
|
||
|
|
|
||
|
|
mutex_lock(&line6pcm->state_mutex);
|
||
|
|
if (!pstr->running)
|
||
|
|
line6_wait_clear_audio_urbs(line6pcm, pstr);
|
||
|
|
|
||
|
|
if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
|
||
|
|
line6pcm->out.count = 0;
|
||
|
|
line6pcm->out.pos = 0;
|
||
|
|
line6pcm->out.pos_done = 0;
|
||
|
|
line6pcm->out.bytes = 0;
|
||
|
|
line6pcm->in.count = 0;
|
||
|
|
line6pcm->in.pos_done = 0;
|
||
|
|
line6pcm->in.bytes = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_unlock(&line6pcm->state_mutex);
|
||
|
|
return 0;
|
||
|
|
}
|