440 lines
11 KiB
C
440 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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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#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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__le16 *p, *buf_end;
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p = (__le16 *)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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short pv = le16_to_cpu(*p);
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int val = (pv * volume[chn & 1]) >> 8;
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pv = clamp(val, -0x8000, 0x7fff);
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*p = cpu_to_le16(pv);
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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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val = clamp(val, -0x800000, 0x7fffff);
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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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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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/*
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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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__le16 *pi, *po, *buf_end;
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pi = (__le16 *)signal;
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po = (__le16 *)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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short pov = le16_to_cpu(*po);
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short piv = le16_to_cpu(*pi);
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int val = pov + ((piv * volume) >> 8);
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pov = clamp(val, -0x8000, 0x7fff);
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*po = cpu_to_le16(pov);
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}
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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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must be called in line6pcm->out.lock context
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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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int i, urb_size, urb_frames;
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int ret;
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const int bytes_per_frame =
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line6pcm->properties->bytes_per_channel *
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line6pcm->properties->playback_hw.channels_max;
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const int frame_increment =
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line6pcm->properties->rates.rats[0].num_min;
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const int frame_factor =
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line6pcm->properties->rates.rats[0].den *
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(line6pcm->line6->intervals_per_second / LINE6_ISO_INTERVAL);
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struct urb *urb_out;
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index = find_first_zero_bit(&line6pcm->out.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_out = line6pcm->out.urbs[index];
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urb_size = 0;
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/* TODO: this may not work for LINE6_ISO_PACKETS != 1 */
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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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fsize = line6pcm->prev_fsize;
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if (fsize == 0) {
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int n;
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line6pcm->out.count += frame_increment;
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n = line6pcm->out.count / frame_factor;
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line6pcm->out.count -= n * frame_factor;
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fsize = n;
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}
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fsize *= bytes_per_frame;
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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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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->out.buffer +
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index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_out;
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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_STREAM_PCM, &line6pcm->out.running) &&
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!test_bit(LINE6_FLAG_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->out.pos + 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->out.pos;
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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->out.pos * 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->out.pos * bytes_per_frame,
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urb_out->transfer_buffer_length);
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}
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line6pcm->out.pos += urb_frames;
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if (line6pcm->out.pos >= runtime->buffer_size)
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line6pcm->out.pos -= runtime->buffer_size;
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change_volume(urb_out, line6pcm->volume_playback,
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bytes_per_frame);
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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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spin_lock_nested(&line6pcm->in.lock, SINGLE_DEPTH_NESTING);
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if (line6pcm->prev_fbuf) {
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if (test_bit(LINE6_STREAM_IMPULSE, &line6pcm->out.running)) {
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create_impulse_test_signal(line6pcm, urb_out,
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bytes_per_frame);
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if (test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) {
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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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if (!(line6pcm->line6->properties->capabilities & LINE6_CAP_HWMON)
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&& line6pcm->out.running && line6pcm->in.running)
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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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}
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line6pcm->prev_fbuf = NULL;
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line6pcm->prev_fsize = 0;
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}
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spin_unlock(&line6pcm->in.lock);
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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->out.active_urbs);
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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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return 0;
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}
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/*
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Submit all currently available playback URBs.
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must be called in line6pcm->out.lock context
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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 = 0, i;
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for (i = 0; i < line6pcm->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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break;
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}
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return ret;
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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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const int bytes_per_frame =
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line6pcm->properties->bytes_per_channel *
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line6pcm->properties->playback_hw.channels_max;
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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->out.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->out.urbs[index])
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break;
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if (index >= line6pcm->line6->iso_buffers)
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return; /* URB has been unlinked asynchronously */
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for (i = 0; i < LINE6_ISO_PACKETS; i++)
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length += urb->iso_frame_desc[i].length;
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spin_lock_irqsave(&line6pcm->out.lock, flags);
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if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
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struct snd_pcm_runtime *runtime = substream->runtime;
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line6pcm->out.pos_done +=
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length / bytes_per_frame;
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if (line6pcm->out.pos_done >= runtime->buffer_size)
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line6pcm->out.pos_done -= runtime->buffer_size;
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}
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clear_bit(index, &line6pcm->out.active_urbs);
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for (i = 0; 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->out.unlink_urbs))
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shutdown = 1;
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if (!shutdown) {
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submit_audio_out_urb(line6pcm);
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if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
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line6pcm->out.bytes += length;
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if (line6pcm->out.bytes >= line6pcm->out.period) {
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line6pcm->out.bytes %= line6pcm->out.period;
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spin_unlock(&line6pcm->out.lock);
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snd_pcm_period_elapsed(substream);
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spin_lock(&line6pcm->out.lock);
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}
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}
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}
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spin_unlock_irqrestore(&line6pcm->out.lock, flags);
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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->rates);
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if (err < 0)
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return err;
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runtime->hw = line6pcm->properties->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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/* playback operators */
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const 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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.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_out_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->out.urbs = kcalloc(line6->iso_buffers, sizeof(struct urb *),
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GFP_KERNEL);
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if (line6pcm->out.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 out: */
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urb = line6pcm->out.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_sndisocpipe(line6->usbdev,
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line6->properties->ep_audio_w &
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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_out_callback;
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if (usb_urb_ep_type_check(urb))
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return -EINVAL;
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}
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return 0;
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}
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