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