| /* |
| * 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" |
| #include "playback.h" |
| |
| /* |
| Software stereo volume control. |
| */ |
| static void change_volume(struct urb *urb_out, int volume[], |
| int bytes_per_frame) |
| { |
| int chn = 0; |
| |
| if (volume[0] == 256 && volume[1] == 256) |
| return; /* maximum volume - no change */ |
| |
| if (bytes_per_frame == 4) { |
| __le16 *p, *buf_end; |
| |
| p = (__le16 *)urb_out->transfer_buffer; |
| buf_end = p + urb_out->transfer_buffer_length / sizeof(*p); |
| |
| for (; p < buf_end; ++p) { |
| short pv = le16_to_cpu(*p); |
| int val = (pv * volume[chn & 1]) >> 8; |
| pv = clamp(val, -0x8000, 0x7fff); |
| *p = cpu_to_le16(pv); |
| ++chn; |
| } |
| } else if (bytes_per_frame == 6) { |
| unsigned char *p, *buf_end; |
| |
| p = (unsigned char *)urb_out->transfer_buffer; |
| buf_end = p + urb_out->transfer_buffer_length; |
| |
| for (; p < buf_end; p += 3) { |
| int val; |
| |
| val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16); |
| val = (val * volume[chn & 1]) >> 8; |
| val = clamp(val, -0x800000, 0x7fffff); |
| p[0] = val; |
| p[1] = val >> 8; |
| p[2] = val >> 16; |
| ++chn; |
| } |
| } |
| } |
| |
| /* |
| Create signal for impulse response test. |
| */ |
| static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm, |
| struct urb *urb_out, int bytes_per_frame) |
| { |
| int frames = urb_out->transfer_buffer_length / bytes_per_frame; |
| |
| if (bytes_per_frame == 4) { |
| int i; |
| short *pi = (short *)line6pcm->prev_fbuf; |
| short *po = (short *)urb_out->transfer_buffer; |
| |
| for (i = 0; i < frames; ++i) { |
| po[0] = pi[0]; |
| po[1] = 0; |
| pi += 2; |
| po += 2; |
| } |
| } else if (bytes_per_frame == 6) { |
| int i, j; |
| unsigned char *pi = line6pcm->prev_fbuf; |
| unsigned char *po = urb_out->transfer_buffer; |
| |
| for (i = 0; i < frames; ++i) { |
| for (j = 0; j < bytes_per_frame / 2; ++j) |
| po[j] = pi[j]; |
| |
| for (; j < bytes_per_frame; ++j) |
| po[j] = 0; |
| |
| pi += bytes_per_frame; |
| po += bytes_per_frame; |
| } |
| } |
| if (--line6pcm->impulse_count <= 0) { |
| ((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame - |
| 1] = |
| line6pcm->impulse_volume; |
| line6pcm->impulse_count = line6pcm->impulse_period; |
| } |
| } |
| |
| /* |
| Add signal to buffer for software monitoring. |
| */ |
| static void add_monitor_signal(struct urb *urb_out, unsigned char *signal, |
| int volume, int bytes_per_frame) |
| { |
| if (volume == 0) |
| return; /* zero volume - no change */ |
| |
| if (bytes_per_frame == 4) { |
| __le16 *pi, *po, *buf_end; |
| |
| pi = (__le16 *)signal; |
| po = (__le16 *)urb_out->transfer_buffer; |
| buf_end = po + urb_out->transfer_buffer_length / sizeof(*po); |
| |
| for (; po < buf_end; ++pi, ++po) { |
| short pov = le16_to_cpu(*po); |
| short piv = le16_to_cpu(*pi); |
| int val = pov + ((piv * volume) >> 8); |
| pov = clamp(val, -0x8000, 0x7fff); |
| *po = cpu_to_le16(pov); |
| } |
| } |
| |
| /* |
| We don't need to handle devices with 6 bytes per frame here |
| since they all support hardware monitoring. |
| */ |
| } |
| |
| /* |
| Find a free URB, prepare audio data, and submit URB. |
| must be called in line6pcm->out.lock context |
| */ |
| static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm) |
| { |
| int index; |
| int i, urb_size, urb_frames; |
| int ret; |
| const int bytes_per_frame = |
| line6pcm->properties->bytes_per_channel * |
| line6pcm->properties->playback_hw.channels_max; |
| const int frame_increment = |
| line6pcm->properties->rates.rats[0].num_min; |
| const int frame_factor = |
| line6pcm->properties->rates.rats[0].den * |
| (line6pcm->line6->intervals_per_second / LINE6_ISO_INTERVAL); |
| struct urb *urb_out; |
| |
| index = find_first_zero_bit(&line6pcm->out.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_out = line6pcm->out.urbs[index]; |
| urb_size = 0; |
| |
| /* TODO: this may not work for LINE6_ISO_PACKETS != 1 */ |
| for (i = 0; i < LINE6_ISO_PACKETS; ++i) { |
| /* compute frame size for given sampling rate */ |
| int fsize = 0; |
| struct usb_iso_packet_descriptor *fout = |
| &urb_out->iso_frame_desc[i]; |
| |
| fsize = line6pcm->prev_fsize; |
| if (fsize == 0) { |
| int n; |
| |
| line6pcm->out.count += frame_increment; |
| n = line6pcm->out.count / frame_factor; |
| line6pcm->out.count -= n * frame_factor; |
| fsize = n; |
| } |
| |
| fsize *= bytes_per_frame; |
| |
| fout->offset = urb_size; |
| fout->length = fsize; |
| urb_size += fsize; |
| } |
| |
| if (urb_size == 0) { |
| /* can't determine URB size */ |
| dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n"); |
| return -EINVAL; |
| } |
| |
| urb_frames = urb_size / bytes_per_frame; |
| urb_out->transfer_buffer = |
| line6pcm->out.buffer + |
| index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_out; |
| urb_out->transfer_buffer_length = urb_size; |
| urb_out->context = line6pcm; |
| |
| if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running) && |
| !test_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags)) { |
| struct snd_pcm_runtime *runtime = |
| get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime; |
| |
| if (line6pcm->out.pos + urb_frames > runtime->buffer_size) { |
| /* |
| The transferred area goes over buffer boundary, |
| copy the data to the temp buffer. |
| */ |
| int len; |
| |
| len = runtime->buffer_size - line6pcm->out.pos; |
| |
| if (len > 0) { |
| memcpy(urb_out->transfer_buffer, |
| runtime->dma_area + |
| line6pcm->out.pos * bytes_per_frame, |
| len * bytes_per_frame); |
| memcpy(urb_out->transfer_buffer + |
| len * bytes_per_frame, runtime->dma_area, |
| (urb_frames - len) * bytes_per_frame); |
| } else |
| dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n", |
| len); |
| } else { |
| memcpy(urb_out->transfer_buffer, |
| runtime->dma_area + |
| line6pcm->out.pos * bytes_per_frame, |
| urb_out->transfer_buffer_length); |
| } |
| |
| line6pcm->out.pos += urb_frames; |
| if (line6pcm->out.pos >= runtime->buffer_size) |
| line6pcm->out.pos -= runtime->buffer_size; |
| |
| change_volume(urb_out, line6pcm->volume_playback, |
| bytes_per_frame); |
| } else { |
| memset(urb_out->transfer_buffer, 0, |
| urb_out->transfer_buffer_length); |
| } |
| |
| spin_lock_nested(&line6pcm->in.lock, SINGLE_DEPTH_NESTING); |
| if (line6pcm->prev_fbuf) { |
| if (test_bit(LINE6_STREAM_IMPULSE, &line6pcm->out.running)) { |
| create_impulse_test_signal(line6pcm, urb_out, |
| bytes_per_frame); |
| if (test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) { |
| line6_capture_copy(line6pcm, |
| urb_out->transfer_buffer, |
| urb_out-> |
| transfer_buffer_length); |
| line6_capture_check_period(line6pcm, |
| urb_out->transfer_buffer_length); |
| } |
| } else { |
| if (!(line6pcm->line6->properties->capabilities & LINE6_CAP_HWMON) |
| && line6pcm->out.running && line6pcm->in.running) |
| add_monitor_signal(urb_out, line6pcm->prev_fbuf, |
| line6pcm->volume_monitor, |
| bytes_per_frame); |
| } |
| line6pcm->prev_fbuf = NULL; |
| line6pcm->prev_fsize = 0; |
| } |
| spin_unlock(&line6pcm->in.lock); |
| |
| ret = usb_submit_urb(urb_out, GFP_ATOMIC); |
| |
| if (ret == 0) |
| set_bit(index, &line6pcm->out.active_urbs); |
| else |
| dev_err(line6pcm->line6->ifcdev, |
| "URB out #%d submission failed (%d)\n", index, ret); |
| |
| return 0; |
| } |
| |
| /* |
| Submit all currently available playback URBs. |
| must be called in line6pcm->out.lock context |
| */ |
| int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm) |
| { |
| int ret = 0, i; |
| |
| for (i = 0; i < line6pcm->line6->iso_buffers; ++i) { |
| ret = submit_audio_out_urb(line6pcm); |
| if (ret < 0) |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| Callback for completed playback URB. |
| */ |
| static void audio_out_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; |
| struct snd_pcm_substream *substream = |
| get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK); |
| const int bytes_per_frame = |
| line6pcm->properties->bytes_per_channel * |
| line6pcm->properties->playback_hw.channels_max; |
| |
| #if USE_CLEAR_BUFFER_WORKAROUND |
| memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); |
| #endif |
| |
| line6pcm->out.last_frame = urb->start_frame; |
| |
| /* find index of URB */ |
| for (index = 0; index < line6pcm->line6->iso_buffers; index++) |
| if (urb == line6pcm->out.urbs[index]) |
| break; |
| |
| if (index >= line6pcm->line6->iso_buffers) |
| return; /* URB has been unlinked asynchronously */ |
| |
| for (i = 0; i < LINE6_ISO_PACKETS; i++) |
| length += urb->iso_frame_desc[i].length; |
| |
| spin_lock_irqsave(&line6pcm->out.lock, flags); |
| |
| if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| |
| line6pcm->out.pos_done += |
| length / bytes_per_frame; |
| |
| if (line6pcm->out.pos_done >= runtime->buffer_size) |
| line6pcm->out.pos_done -= runtime->buffer_size; |
| } |
| |
| clear_bit(index, &line6pcm->out.active_urbs); |
| |
| for (i = 0; i < LINE6_ISO_PACKETS; i++) |
| if (urb->iso_frame_desc[i].status == -EXDEV) { |
| shutdown = 1; |
| break; |
| } |
| |
| if (test_and_clear_bit(index, &line6pcm->out.unlink_urbs)) |
| shutdown = 1; |
| |
| if (!shutdown) { |
| submit_audio_out_urb(line6pcm); |
| |
| if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) { |
| line6pcm->out.bytes += length; |
| if (line6pcm->out.bytes >= line6pcm->out.period) { |
| line6pcm->out.bytes %= line6pcm->out.period; |
| spin_unlock(&line6pcm->out.lock); |
| snd_pcm_period_elapsed(substream); |
| spin_lock(&line6pcm->out.lock); |
| } |
| } |
| } |
| spin_unlock_irqrestore(&line6pcm->out.lock, flags); |
| } |
| |
| /* open playback callback */ |
| static int snd_line6_playback_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; |
| |
| runtime->hw = line6pcm->properties->playback_hw; |
| return 0; |
| } |
| |
| /* close playback callback */ |
| static int snd_line6_playback_close(struct snd_pcm_substream *substream) |
| { |
| return 0; |
| } |
| |
| /* playback operators */ |
| const 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_hw_params, |
| .hw_free = snd_line6_hw_free, |
| .prepare = snd_line6_prepare, |
| .trigger = snd_line6_trigger, |
| .pointer = snd_line6_pointer, |
| }; |
| |
| int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm) |
| { |
| struct usb_line6 *line6 = line6pcm->line6; |
| int i; |
| |
| line6pcm->out.urbs = kcalloc(line6->iso_buffers, sizeof(struct urb *), |
| GFP_KERNEL); |
| if (line6pcm->out.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 out: */ |
| urb = line6pcm->out.urbs[i] = |
| usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL); |
| |
| if (urb == NULL) |
| return -ENOMEM; |
| |
| urb->dev = line6->usbdev; |
| urb->pipe = |
| usb_sndisocpipe(line6->usbdev, |
| line6->properties->ep_audio_w & |
| 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; |
| if (usb_urb_ep_type_check(urb)) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |