![Stefan Hajnoczi](/assets/img/avatar_default.png)
The CONFIG_LINE6_USB_DUMP_PCM config option prints a hexdump of PCM audio data as URBs are sent and received. The usbmon feature should be used instead of manually dumping PCM URBs. There are a few advantages to using usbmon: * Can be turned on/off at runtime * Provides full USB-level traffic * tcpdump and wireshark support for powerful analysis * No driver-specific code is required This is the last user of line6_write_hexdump() so we drop it too. Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
583 lines
14 KiB
C
583 lines
14 KiB
C
/*
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* Line6 Linux USB driver - 0.9.1beta
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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 "audio.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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#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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#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
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/*
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Create signal for impulse response test.
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*/
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static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
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struct urb *urb_out, int bytes_per_frame)
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{
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int frames = urb_out->transfer_buffer_length / bytes_per_frame;
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if (bytes_per_frame == 4) {
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int i;
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short *pi = (short *)line6pcm->prev_fbuf;
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short *po = (short *)urb_out->transfer_buffer;
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for (i = 0; i < frames; ++i) {
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po[0] = pi[0];
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po[1] = 0;
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pi += 2;
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po += 2;
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}
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} else if (bytes_per_frame == 6) {
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int i, j;
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unsigned char *pi = line6pcm->prev_fbuf;
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unsigned char *po = urb_out->transfer_buffer;
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for (i = 0; i < frames; ++i) {
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for (j = 0; j < bytes_per_frame / 2; ++j)
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po[j] = pi[j];
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for (; j < bytes_per_frame; ++j)
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po[j] = 0;
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pi += bytes_per_frame;
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po += bytes_per_frame;
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}
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}
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if (--line6pcm->impulse_count <= 0) {
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((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
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1] =
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line6pcm->impulse_volume;
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line6pcm->impulse_count = line6pcm->impulse_period;
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}
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}
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#endif
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/*
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Add signal to buffer for software monitoring.
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*/
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static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
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int volume, int bytes_per_frame)
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{
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if (volume == 0)
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return; /* zero volume - no change */
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if (bytes_per_frame == 4) {
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short *pi, *po, *buf_end;
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pi = (short *)signal;
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po = (short *)urb_out->transfer_buffer;
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buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
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for (; po < buf_end; ++pi, ++po)
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*po += (*pi * volume) >> 8;
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}
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/*
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We don't need to handle devices with 6 bytes per frame here
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since they all support hardware monitoring.
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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_line6_pcm *line6pcm)
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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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int ret;
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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 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(line6pcm->line6->ifcdev, "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 fsize = 0;
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struct usb_iso_packet_descriptor *fout =
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&urb_out->iso_frame_desc[i];
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if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
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fsize = line6pcm->prev_fsize;
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if (fsize == 0) {
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int n;
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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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fsize = n * bytes_per_frame;
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}
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fout->offset = urb_size;
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fout->length = fsize;
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urb_size += fsize;
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}
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if (urb_size == 0) {
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/* can't determine URB size */
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spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
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dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
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return -EINVAL;
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}
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urb_frames = urb_size / bytes_per_frame;
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urb_out->transfer_buffer =
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line6pcm->buffer_out +
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index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
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urb_out->transfer_buffer_length = urb_size;
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urb_out->context = line6pcm;
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if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags) &&
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!test_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags)) {
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struct snd_pcm_runtime *runtime =
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get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
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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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if (len > 0) {
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memcpy(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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len * bytes_per_frame);
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memcpy(urb_out->transfer_buffer +
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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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dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
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len);
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} else {
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memcpy(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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urb_out->transfer_buffer_length);
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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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} else {
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memset(urb_out->transfer_buffer, 0,
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urb_out->transfer_buffer_length);
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}
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change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
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if (line6pcm->prev_fbuf != NULL) {
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#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
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if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
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create_impulse_test_signal(line6pcm, urb_out,
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bytes_per_frame);
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if (line6pcm->flags & LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
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line6_capture_copy(line6pcm,
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urb_out->transfer_buffer,
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urb_out->
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transfer_buffer_length);
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line6_capture_check_period(line6pcm,
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urb_out->transfer_buffer_length);
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}
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} else {
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#endif
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if (!
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(line6pcm->line6->
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properties->capabilities & LINE6_BIT_HWMON)
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&& (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
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&& (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
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add_monitor_signal(urb_out, line6pcm->prev_fbuf,
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line6pcm->volume_monitor,
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bytes_per_frame);
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#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
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}
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#endif
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}
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ret = usb_submit_urb(urb_out, GFP_ATOMIC);
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if (ret == 0)
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set_bit(index, &line6pcm->active_urb_out);
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else
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dev_err(line6pcm->line6->ifcdev,
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"URB out #%d submission failed (%d)\n", index, ret);
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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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int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
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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(line6pcm);
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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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void line6_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
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finished.
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*/
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void line6_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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}
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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 line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
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{
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line6_unlink_audio_out_urbs(line6pcm);
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line6_wait_clear_audio_out_urbs(line6pcm);
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}
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void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
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{
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kfree(line6pcm->buffer_out);
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line6pcm->buffer_out = NULL;
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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_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
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struct snd_pcm_substream *substream =
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get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
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#if USE_CLEAR_BUFFER_WORKAROUND
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memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
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#endif
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line6pcm->last_frame_out = urb->start_frame;
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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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if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
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struct snd_pcm_runtime *runtime = substream->runtime;
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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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}
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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 == -EXDEV) {
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shutdown = 1;
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break;
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}
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if (test_and_clear_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(line6pcm);
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if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
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&line6pcm->flags)) {
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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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}
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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->
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properties->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 = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
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if (ret < 0)
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return ret;
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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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line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
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return ret;
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}
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line6pcm->period_out = params_period_bytes(hw_params);
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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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line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
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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_line6_pcm *line6pcm, int cmd)
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{
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int err;
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|
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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#ifdef CONFIG_PM
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case SNDRV_PCM_TRIGGER_RESUME:
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#endif
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err = line6_pcm_acquire(line6pcm,
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LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
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|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
#ifdef CONFIG_PM
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
#endif
|
|
err = line6_pcm_release(line6pcm,
|
|
LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* playback pointer callback */
|
|
static snd_pcm_uframes_t
|
|
snd_line6_playback_pointer(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
|
|
return line6pcm->pos_out_done;
|
|
}
|
|
|
|
/* playback operators */
|
|
struct snd_pcm_ops snd_line6_playback_ops = {
|
|
.open = snd_line6_playback_open,
|
|
.close = snd_line6_playback_close,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = snd_line6_playback_hw_params,
|
|
.hw_free = snd_line6_playback_hw_free,
|
|
.prepare = snd_line6_prepare,
|
|
.trigger = snd_line6_trigger,
|
|
.pointer = snd_line6_playback_pointer,
|
|
};
|
|
|
|
int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
|
|
{
|
|
int i;
|
|
|
|
/* create audio URBs and fill in constant values: */
|
|
for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
|
|
struct urb *urb;
|
|
|
|
/* URB for audio out: */
|
|
urb = line6pcm->urb_audio_out[i] =
|
|
usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
|
|
|
|
if (urb == NULL) {
|
|
dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
urb->dev = line6pcm->line6->usbdev;
|
|
urb->pipe =
|
|
usb_sndisocpipe(line6pcm->line6->usbdev,
|
|
line6pcm->ep_audio_write &
|
|
USB_ENDPOINT_NUMBER_MASK);
|
|
urb->transfer_flags = URB_ISO_ASAP;
|
|
urb->start_frame = -1;
|
|
urb->number_of_packets = LINE6_ISO_PACKETS;
|
|
urb->interval = LINE6_ISO_INTERVAL;
|
|
urb->error_count = 0;
|
|
urb->complete = audio_out_callback;
|
|
}
|
|
|
|
return 0;
|
|
}
|