From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/sound/usb/line6/playback.c | 429 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 429 insertions(+) create mode 100644 kernel/sound/usb/line6/playback.c (limited to 'kernel/sound/usb/line6/playback.c') diff --git a/kernel/sound/usb/line6/playback.c b/kernel/sound/usb/line6/playback.c new file mode 100644 index 000000000..97ed593f6 --- /dev/null +++ b/kernel/sound/usb/line6/playback.c @@ -0,0 +1,429 @@ +/* + * 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 +#include +#include +#include + +#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_frame; + const int frame_increment = + line6pcm->properties->rates.rats[0].num_min; + const int frame_factor = + line6pcm->properties->rates.rats[0].den * + (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL); + struct urb *urb_out; + + index = + find_first_zero_bit(&line6pcm->out.active_urbs, LINE6_ISO_BUFFERS); + + if (index < 0 || index >= LINE6_ISO_BUFFERS) { + dev_err(line6pcm->line6->ifcdev, "no free URB found\n"); + return -EINVAL; + } + + urb_out = line6pcm->out.urbs[index]; + urb_size = 0; + + 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 * 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; + 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 < 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); + +#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 < LINE6_ISO_BUFFERS; index++) + if (urb == line6pcm->out.urbs[index]) + break; + + if (index >= 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 / line6pcm->properties->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 */ +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; + + /* 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; + } + + return 0; +} -- cgit 1.2.3-korg