| /* |
| * Line 6 Linux USB driver |
| * |
| * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation, version 2. |
| * |
| */ |
| |
| #include <linux/slab.h> |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| |
| #include "capture.h" |
| #include "driver.h" |
| #include "pcm.h" |
| |
| /* |
| Find a free URB and submit it. |
| must be called in line6pcm->in.lock context |
| */ |
| static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm) |
| { |
| int index; |
| int i, urb_size; |
| int ret; |
| struct urb *urb_in; |
| |
| index = find_first_zero_bit(&line6pcm->in.active_urbs, |
| line6pcm->line6->iso_buffers); |
| |
| if (index < 0 || index >= line6pcm->line6->iso_buffers) { |
| dev_err(line6pcm->line6->ifcdev, "no free URB found\n"); |
| return -EINVAL; |
| } |
| |
| urb_in = line6pcm->in.urbs[index]; |
| urb_size = 0; |
| |
| for (i = 0; i < LINE6_ISO_PACKETS; ++i) { |
| struct usb_iso_packet_descriptor *fin = |
| &urb_in->iso_frame_desc[i]; |
| fin->offset = urb_size; |
| fin->length = line6pcm->max_packet_size_in; |
| urb_size += line6pcm->max_packet_size_in; |
| } |
| |
| urb_in->transfer_buffer = |
| line6pcm->in.buffer + |
| index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_in; |
| urb_in->transfer_buffer_length = urb_size; |
| urb_in->context = line6pcm; |
| |
| ret = usb_submit_urb(urb_in, GFP_ATOMIC); |
| |
| if (ret == 0) |
| set_bit(index, &line6pcm->in.active_urbs); |
| else |
| dev_err(line6pcm->line6->ifcdev, |
| "URB in #%d submission failed (%d)\n", index, ret); |
| |
| return 0; |
| } |
| |
| /* |
| Submit all currently available capture URBs. |
| must be called in line6pcm->in.lock context |
| */ |
| int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm) |
| { |
| int ret = 0, i; |
| |
| for (i = 0; i < line6pcm->line6->iso_buffers; ++i) { |
| ret = submit_audio_in_urb(line6pcm); |
| if (ret < 0) |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| Copy data into ALSA capture buffer. |
| */ |
| void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize) |
| { |
| struct snd_pcm_substream *substream = |
| get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| const int bytes_per_frame = |
| line6pcm->properties->bytes_per_channel * |
| line6pcm->properties->capture_hw.channels_max; |
| int frames = fsize / bytes_per_frame; |
| |
| if (runtime == NULL) |
| return; |
| |
| if (line6pcm->in.pos_done + frames > runtime->buffer_size) { |
| /* |
| The transferred area goes over buffer boundary, |
| copy two separate chunks. |
| */ |
| int len; |
| |
| len = runtime->buffer_size - line6pcm->in.pos_done; |
| |
| if (len > 0) { |
| memcpy(runtime->dma_area + |
| line6pcm->in.pos_done * bytes_per_frame, fbuf, |
| len * bytes_per_frame); |
| memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, |
| (frames - len) * bytes_per_frame); |
| } else { |
| /* this is somewhat paranoid */ |
| dev_err(line6pcm->line6->ifcdev, |
| "driver bug: len = %d\n", len); |
| } |
| } else { |
| /* copy single chunk */ |
| memcpy(runtime->dma_area + |
| line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize); |
| } |
| |
| line6pcm->in.pos_done += frames; |
| if (line6pcm->in.pos_done >= runtime->buffer_size) |
| line6pcm->in.pos_done -= runtime->buffer_size; |
| } |
| |
| void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length) |
| { |
| struct snd_pcm_substream *substream = |
| get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); |
| |
| line6pcm->in.bytes += length; |
| if (line6pcm->in.bytes >= line6pcm->in.period) { |
| line6pcm->in.bytes %= line6pcm->in.period; |
| spin_unlock(&line6pcm->in.lock); |
| snd_pcm_period_elapsed(substream); |
| spin_lock(&line6pcm->in.lock); |
| } |
| } |
| |
| /* |
| * Callback for completed capture URB. |
| */ |
| static void audio_in_callback(struct urb *urb) |
| { |
| int i, index, length = 0, shutdown = 0; |
| unsigned long flags; |
| |
| struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context; |
| |
| line6pcm->in.last_frame = urb->start_frame; |
| |
| /* find index of URB */ |
| for (index = 0; index < line6pcm->line6->iso_buffers; ++index) |
| if (urb == line6pcm->in.urbs[index]) |
| break; |
| |
| spin_lock_irqsave(&line6pcm->in.lock, flags); |
| |
| for (i = 0; i < LINE6_ISO_PACKETS; ++i) { |
| char *fbuf; |
| int fsize; |
| struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i]; |
| |
| if (fin->status == -EXDEV) { |
| shutdown = 1; |
| break; |
| } |
| |
| fbuf = urb->transfer_buffer + fin->offset; |
| fsize = fin->actual_length; |
| |
| if (fsize > line6pcm->max_packet_size_in) { |
| dev_err(line6pcm->line6->ifcdev, |
| "driver and/or device bug: packet too large (%d > %d)\n", |
| fsize, line6pcm->max_packet_size_in); |
| } |
| |
| length += fsize; |
| |
| BUILD_BUG_ON_MSG(LINE6_ISO_PACKETS != 1, |
| "The following code assumes LINE6_ISO_PACKETS == 1"); |
| /* TODO: |
| * Also, if iso_buffers != 2, the prev frame is almost random at |
| * playback side. |
| * This needs to be redesigned. It should be "stable", but we may |
| * experience sync problems on such high-speed configs. |
| */ |
| |
| line6pcm->prev_fbuf = fbuf; |
| line6pcm->prev_fsize = fsize / |
| (line6pcm->properties->bytes_per_channel * |
| line6pcm->properties->capture_hw.channels_max); |
| |
| if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) && |
| test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) && |
| fsize > 0) |
| line6_capture_copy(line6pcm, fbuf, fsize); |
| } |
| |
| clear_bit(index, &line6pcm->in.active_urbs); |
| |
| if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs)) |
| shutdown = 1; |
| |
| if (!shutdown) { |
| submit_audio_in_urb(line6pcm); |
| |
| if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) && |
| test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) |
| line6_capture_check_period(line6pcm, length); |
| } |
| |
| spin_unlock_irqrestore(&line6pcm->in.lock, flags); |
| } |
| |
| /* open capture callback */ |
| static int snd_line6_capture_open(struct snd_pcm_substream *substream) |
| { |
| int err; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); |
| |
| err = snd_pcm_hw_constraint_ratdens(runtime, 0, |
| SNDRV_PCM_HW_PARAM_RATE, |
| &line6pcm->properties->rates); |
| if (err < 0) |
| return err; |
| |
| line6_pcm_acquire(line6pcm, LINE6_STREAM_CAPTURE_HELPER, false); |
| |
| runtime->hw = line6pcm->properties->capture_hw; |
| return 0; |
| } |
| |
| /* close capture callback */ |
| static int snd_line6_capture_close(struct snd_pcm_substream *substream) |
| { |
| struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); |
| |
| line6_pcm_release(line6pcm, LINE6_STREAM_CAPTURE_HELPER); |
| return 0; |
| } |
| |
| /* capture operators */ |
| const struct snd_pcm_ops snd_line6_capture_ops = { |
| .open = snd_line6_capture_open, |
| .close = snd_line6_capture_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = snd_line6_hw_params, |
| .hw_free = snd_line6_hw_free, |
| .prepare = snd_line6_prepare, |
| .trigger = snd_line6_trigger, |
| .pointer = snd_line6_pointer, |
| }; |
| |
| int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm) |
| { |
| struct usb_line6 *line6 = line6pcm->line6; |
| int i; |
| |
| line6pcm->in.urbs = kcalloc(line6->iso_buffers, sizeof(struct urb *), |
| GFP_KERNEL); |
| if (line6pcm->in.urbs == NULL) |
| return -ENOMEM; |
| |
| /* create audio URBs and fill in constant values: */ |
| for (i = 0; i < line6->iso_buffers; ++i) { |
| struct urb *urb; |
| |
| /* URB for audio in: */ |
| urb = line6pcm->in.urbs[i] = |
| usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL); |
| |
| if (urb == NULL) |
| return -ENOMEM; |
| |
| urb->dev = line6->usbdev; |
| urb->pipe = |
| usb_rcvisocpipe(line6->usbdev, |
| line6->properties->ep_audio_r & |
| 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_in_callback; |
| if (usb_urb_ep_type_check(urb)) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |