298 lines
7.5 KiB
C
298 lines
7.5 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 <sound/core.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 "pcm.h"
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/*
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Find a free URB and submit it.
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must be called in line6pcm->in.lock context
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*/
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static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
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{
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int index;
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int i, urb_size;
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int ret;
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struct urb *urb_in;
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index = find_first_zero_bit(&line6pcm->in.active_urbs,
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line6pcm->line6->iso_buffers);
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if (index < 0 || index >= line6pcm->line6->iso_buffers) {
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dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
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return -EINVAL;
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}
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urb_in = line6pcm->in.urbs[index];
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urb_size = 0;
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for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
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struct usb_iso_packet_descriptor *fin =
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&urb_in->iso_frame_desc[i];
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fin->offset = urb_size;
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fin->length = line6pcm->max_packet_size_in;
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urb_size += line6pcm->max_packet_size_in;
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}
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urb_in->transfer_buffer =
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line6pcm->in.buffer +
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index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_in;
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urb_in->transfer_buffer_length = urb_size;
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urb_in->context = line6pcm;
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ret = usb_submit_urb(urb_in, GFP_ATOMIC);
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if (ret == 0)
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set_bit(index, &line6pcm->in.active_urbs);
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else
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dev_err(line6pcm->line6->ifcdev,
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"URB in #%d submission failed (%d)\n", index, ret);
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return 0;
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}
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/*
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Submit all currently available capture URBs.
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must be called in line6pcm->in.lock context
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*/
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int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
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{
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int ret = 0, i;
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for (i = 0; i < line6pcm->line6->iso_buffers; ++i) {
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ret = submit_audio_in_urb(line6pcm);
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if (ret < 0)
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break;
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}
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return ret;
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}
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/*
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Copy data into ALSA capture buffer.
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*/
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void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
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{
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struct snd_pcm_substream *substream =
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get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
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struct snd_pcm_runtime *runtime = substream->runtime;
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const int bytes_per_frame =
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line6pcm->properties->bytes_per_channel *
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line6pcm->properties->capture_hw.channels_max;
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int frames = fsize / bytes_per_frame;
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if (runtime == NULL)
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return;
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if (line6pcm->in.pos_done + frames > runtime->buffer_size) {
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/*
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The transferred area goes over buffer boundary,
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copy two separate chunks.
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*/
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int len;
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len = runtime->buffer_size - line6pcm->in.pos_done;
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if (len > 0) {
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memcpy(runtime->dma_area +
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line6pcm->in.pos_done * bytes_per_frame, fbuf,
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len * bytes_per_frame);
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memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
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(frames - len) * bytes_per_frame);
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} else {
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/* this is somewhat paranoid */
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dev_err(line6pcm->line6->ifcdev,
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"driver bug: len = %d\n", len);
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}
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} else {
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/* copy single chunk */
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memcpy(runtime->dma_area +
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line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize);
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}
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line6pcm->in.pos_done += frames;
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if (line6pcm->in.pos_done >= runtime->buffer_size)
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line6pcm->in.pos_done -= runtime->buffer_size;
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}
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void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
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{
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struct snd_pcm_substream *substream =
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get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
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line6pcm->in.bytes += length;
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if (line6pcm->in.bytes >= line6pcm->in.period) {
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line6pcm->in.bytes %= line6pcm->in.period;
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spin_unlock(&line6pcm->in.lock);
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snd_pcm_period_elapsed(substream);
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spin_lock(&line6pcm->in.lock);
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}
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}
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/*
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* Callback for completed capture URB.
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*/
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static void audio_in_callback(struct urb *urb)
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{
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int i, index, length = 0, shutdown = 0;
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unsigned long flags;
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struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
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line6pcm->in.last_frame = urb->start_frame;
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/* find index of URB */
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for (index = 0; index < line6pcm->line6->iso_buffers; ++index)
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if (urb == line6pcm->in.urbs[index])
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break;
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spin_lock_irqsave(&line6pcm->in.lock, flags);
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for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
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char *fbuf;
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int fsize;
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struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
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if (fin->status == -EXDEV) {
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shutdown = 1;
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break;
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}
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fbuf = urb->transfer_buffer + fin->offset;
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fsize = fin->actual_length;
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if (fsize > line6pcm->max_packet_size_in) {
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dev_err(line6pcm->line6->ifcdev,
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"driver and/or device bug: packet too large (%d > %d)\n",
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fsize, line6pcm->max_packet_size_in);
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}
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length += fsize;
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BUILD_BUG_ON_MSG(LINE6_ISO_PACKETS != 1,
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"The following code assumes LINE6_ISO_PACKETS == 1");
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/* TODO:
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* Also, if iso_buffers != 2, the prev frame is almost random at
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* playback side.
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* This needs to be redesigned. It should be "stable", but we may
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* experience sync problems on such high-speed configs.
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*/
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line6pcm->prev_fbuf = fbuf;
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line6pcm->prev_fsize = fsize /
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(line6pcm->properties->bytes_per_channel *
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line6pcm->properties->capture_hw.channels_max);
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if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
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test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) &&
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fsize > 0)
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line6_capture_copy(line6pcm, fbuf, fsize);
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}
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clear_bit(index, &line6pcm->in.active_urbs);
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if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs))
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shutdown = 1;
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if (!shutdown) {
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submit_audio_in_urb(line6pcm);
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if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
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test_bit(LINE6_STREAM_PCM, &line6pcm->in.running))
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line6_capture_check_period(line6pcm, length);
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}
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spin_unlock_irqrestore(&line6pcm->in.lock, flags);
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}
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/* open capture callback */
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static int snd_line6_capture_open(struct snd_pcm_substream *substream)
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{
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int err;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
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err = snd_pcm_hw_constraint_ratdens(runtime, 0,
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SNDRV_PCM_HW_PARAM_RATE,
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&line6pcm->properties->rates);
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if (err < 0)
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return err;
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line6_pcm_acquire(line6pcm, LINE6_STREAM_CAPTURE_HELPER, false);
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runtime->hw = line6pcm->properties->capture_hw;
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return 0;
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}
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/* close capture callback */
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static int snd_line6_capture_close(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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line6_pcm_release(line6pcm, LINE6_STREAM_CAPTURE_HELPER);
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return 0;
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}
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/* capture operators */
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struct snd_pcm_ops snd_line6_capture_ops = {
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.open = snd_line6_capture_open,
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.close = snd_line6_capture_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_line6_hw_params,
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.hw_free = snd_line6_hw_free,
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.prepare = snd_line6_prepare,
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.trigger = snd_line6_trigger,
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.pointer = snd_line6_pointer,
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};
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int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
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{
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struct usb_line6 *line6 = line6pcm->line6;
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int i;
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line6pcm->in.urbs = kzalloc(
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sizeof(struct urb *) * line6->iso_buffers, GFP_KERNEL);
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if (line6pcm->in.urbs == NULL)
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return -ENOMEM;
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/* create audio URBs and fill in constant values: */
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for (i = 0; i < line6->iso_buffers; ++i) {
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struct urb *urb;
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/* URB for audio in: */
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urb = line6pcm->in.urbs[i] =
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usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
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if (urb == NULL)
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return -ENOMEM;
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urb->dev = line6->usbdev;
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urb->pipe =
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usb_rcvisocpipe(line6->usbdev,
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line6->properties->ep_audio_r &
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USB_ENDPOINT_NUMBER_MASK);
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urb->transfer_flags = URB_ISO_ASAP;
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urb->start_frame = -1;
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urb->number_of_packets = LINE6_ISO_PACKETS;
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urb->interval = LINE6_ISO_INTERVAL;
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urb->error_count = 0;
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urb->complete = audio_in_callback;
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}
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return 0;
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}
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