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![Shawn Bohrer](/assets/img/avatar_default.png)
Signed-off-by: Shawn Bohrer <shawn.bohrer@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
456 lines
11 KiB
C
456 lines
11 KiB
C
/*
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* Line6 Linux USB driver - 0.8.0
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*
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* Copyright (C) 2004-2009 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 "driver.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 "audio.h"
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#include "pcm.h"
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#include "pod.h"
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#include "playback.h"
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/*
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Software stereo volume control.
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*/
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static void change_volume(struct urb *urb_out, int volume[],
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int bytes_per_frame)
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{
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int chn = 0;
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if (volume[0] == 256 && volume[1] == 256)
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return; /* maximum volume - no change */
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if (bytes_per_frame == 4) {
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short *p, *buf_end;
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p = (short *)urb_out->transfer_buffer;
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buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
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for (; p < buf_end; ++p) {
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*p = (*p * volume[chn & 1]) >> 8;
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++chn;
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}
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} else if (bytes_per_frame == 6) {
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unsigned char *p, *buf_end;
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p = (unsigned char *)urb_out->transfer_buffer;
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buf_end = p + urb_out->transfer_buffer_length;
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for (; p < buf_end; p += 3) {
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int val;
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val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
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val = (val * volume[chn & 1]) >> 8;
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p[0] = val;
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p[1] = val >> 8;
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p[2] = val >> 16;
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++chn;
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}
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}
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}
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/*
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Find a free URB, prepare audio data, and submit URB.
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*/
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static int submit_audio_out_urb(struct snd_pcm_substream *substream)
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{
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int index;
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unsigned long flags;
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int i, urb_size, urb_frames;
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struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
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const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
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const int frame_increment =
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line6pcm->properties->snd_line6_rates.rats[0].num_min;
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const int frame_factor =
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line6pcm->properties->snd_line6_rates.rats[0].den *
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(USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct urb *urb_out;
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spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
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index =
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find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
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if (index < 0 || index >= LINE6_ISO_BUFFERS) {
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spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
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dev_err(s2m(substream), "no free URB found\n");
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return -EINVAL;
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}
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urb_out = line6pcm->urb_audio_out[index];
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urb_size = 0;
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for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
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/* compute frame size for given sampling rate */
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int n, fs;
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struct usb_iso_packet_descriptor *fout =
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&urb_out->iso_frame_desc[i];
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line6pcm->count_out += frame_increment;
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n = line6pcm->count_out / frame_factor;
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line6pcm->count_out -= n * frame_factor;
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fs = n * bytes_per_frame;
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fout->offset = urb_size;
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fout->length = fs;
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urb_size += fs;
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}
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urb_frames = urb_size / bytes_per_frame;
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if (test_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags)) {
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urb_out->transfer_buffer = line6pcm->wrap_out;
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memset(line6pcm->wrap_out, 0, urb_size);
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} else {
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if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
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/*
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The transferred area goes over buffer boundary,
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copy the data to the temp buffer.
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*/
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int len;
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len = runtime->buffer_size - line6pcm->pos_out;
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urb_out->transfer_buffer = line6pcm->wrap_out;
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if (len > 0) {
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memcpy(line6pcm->wrap_out,
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runtime->dma_area +
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line6pcm->pos_out * bytes_per_frame,
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len * bytes_per_frame);
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memcpy(line6pcm->wrap_out +
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len * bytes_per_frame, runtime->dma_area,
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(urb_frames - len) * bytes_per_frame);
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} else {
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/* this is somewhat paranoid */
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dev_err(s2m(substream),
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"driver bug: len = %d\n", len);
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}
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} else {
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/* set the buffer pointer */
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urb_out->transfer_buffer =
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runtime->dma_area +
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line6pcm->pos_out * bytes_per_frame;
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}
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}
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line6pcm->pos_out += urb_frames;
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if (line6pcm->pos_out >= runtime->buffer_size)
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line6pcm->pos_out -= runtime->buffer_size;
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urb_out->transfer_buffer_length = urb_size;
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urb_out->context = substream;
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change_volume(urb_out, line6pcm->volume, bytes_per_frame);
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#if DO_DUMP_PCM_SEND
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for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
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struct usb_iso_packet_descriptor *fout =
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&urb_out->iso_frame_desc[i];
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line6_write_hexdump(line6pcm->line6, 'P',
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urb_out->transfer_buffer + fout->offset,
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fout->length);
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}
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#endif
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if (usb_submit_urb(urb_out, GFP_ATOMIC) == 0)
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set_bit(index, &line6pcm->active_urb_out);
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else
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dev_err(s2m(substream), "URB out #%d submission failed\n",
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index);
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spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
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return 0;
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}
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/*
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Submit all currently available playback URBs.
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*/
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static int submit_audio_out_all_urbs(struct snd_pcm_substream *substream)
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{
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int ret, i;
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for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
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ret = submit_audio_out_urb(substream);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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/*
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Unlink all currently active playback URBs.
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*/
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static void unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
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{
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unsigned int i;
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for (i = LINE6_ISO_BUFFERS; i--;) {
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if (test_bit(i, &line6pcm->active_urb_out)) {
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if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
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struct urb *u = line6pcm->urb_audio_out[i];
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usb_unlink_urb(u);
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}
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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 playback URBs has been finished.
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*/
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static void wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
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{
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int timeout = HZ;
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unsigned 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 = LINE6_ISO_BUFFERS; i--;) {
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if (test_bit(i, &line6pcm->active_urb_out))
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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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snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
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line6pcm->active_urb_out = 0;
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line6pcm->unlink_urb_out = 0;
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}
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/*
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Unlink all currently active playback URBs, and wait for finishing.
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*/
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void unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
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{
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unlink_audio_out_urbs(line6pcm);
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wait_clear_audio_out_urbs(line6pcm);
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}
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/*
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Callback for completed playback URB.
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*/
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static void audio_out_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_pcm_substream *substream =
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(struct snd_pcm_substream *)urb->context;
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struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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/* find index of URB */
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for (index = LINE6_ISO_BUFFERS; index--;)
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if (urb == line6pcm->urb_audio_out[index])
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break;
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if (index < 0)
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return; /* URB has been unlinked asynchronously */
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for (i = LINE6_ISO_PACKETS; i--;)
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length += urb->iso_frame_desc[i].length;
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spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
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line6pcm->pos_out_done +=
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length / line6pcm->properties->bytes_per_frame;
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if (line6pcm->pos_out_done >= runtime->buffer_size)
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line6pcm->pos_out_done -= runtime->buffer_size;
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clear_bit(index, &line6pcm->active_urb_out);
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for (i = LINE6_ISO_PACKETS; i--;)
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if (urb->iso_frame_desc[i].status == -ESHUTDOWN) {
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shutdown = 1;
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break;
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}
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if (test_bit(index, &line6pcm->unlink_urb_out))
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shutdown = 1;
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spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
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if (!shutdown) {
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submit_audio_out_urb(substream);
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line6pcm->bytes_out += length;
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if (line6pcm->bytes_out >= line6pcm->period_out) {
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line6pcm->bytes_out -= line6pcm->period_out;
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snd_pcm_period_elapsed(substream);
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}
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}
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}
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/* open playback callback */
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static int snd_line6_playback_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, SNDRV_PCM_HW_PARAM_RATE,
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(&line6pcm->properties->
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snd_line6_rates));
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if (err < 0)
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return err;
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runtime->hw = line6pcm->properties->snd_line6_playback_hw;
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return 0;
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}
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/* close playback callback */
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static int snd_line6_playback_close(struct snd_pcm_substream *substream)
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{
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return 0;
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}
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/* hw_params playback callback */
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static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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int ret;
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struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
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/* -- Florian Demski [FD] */
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/* don't ask me why, but this fixes the bug on my machine */
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if (line6pcm == NULL) {
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if (substream->pcm == NULL)
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return -ENOMEM;
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if (substream->pcm->private_data == NULL)
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return -ENOMEM;
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substream->private_data = substream->pcm->private_data;
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line6pcm = snd_pcm_substream_chip(substream);
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}
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/* -- [FD] end */
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ret = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (ret < 0)
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return ret;
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line6pcm->period_out = params_period_bytes(hw_params);
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line6pcm->wrap_out = kmalloc(2 * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
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if (!line6pcm->wrap_out) {
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dev_err(s2m(substream), "cannot malloc wrap_out\n");
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return -ENOMEM;
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}
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return 0;
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}
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/* hw_free playback callback */
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static int snd_line6_playback_hw_free(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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unlink_wait_clear_audio_out_urbs(line6pcm);
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kfree(line6pcm->wrap_out);
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line6pcm->wrap_out = NULL;
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return snd_pcm_lib_free_pages(substream);
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}
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/* trigger playback callback */
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int snd_line6_playback_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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int err;
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line6pcm->count_out = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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if (!test_and_set_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags)) {
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err = submit_audio_out_all_urbs(substream);
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if (err < 0) {
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clear_bit(BIT_RUNNING_PLAYBACK,
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&line6pcm->flags);
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return err;
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}
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}
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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if (test_and_clear_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags))
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unlink_audio_out_urbs(line6pcm);
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break;
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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set_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
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break;
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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clear_bit(BIT_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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return 0;
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}
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/* playback pointer callback */
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static snd_pcm_uframes_t
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snd_line6_playback_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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return line6pcm->pos_out_done;
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}
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/* playback operators */
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struct snd_pcm_ops snd_line6_playback_ops = {
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.open = snd_line6_playback_open,
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.close = snd_line6_playback_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_line6_playback_hw_params,
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.hw_free = snd_line6_playback_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_playback_pointer,
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};
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int create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
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{
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int i;
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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 out: */
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urb = line6pcm->urb_audio_out[i] =
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usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
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if (urb == NULL) {
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dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
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return -ENOMEM;
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}
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urb->dev = line6pcm->line6->usbdev;
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urb->pipe =
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usb_sndisocpipe(line6pcm->line6->usbdev,
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line6pcm->
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ep_audio_write & 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_out_callback;
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}
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return 0;
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}
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