From 61864d844c296933d40c02683252bbea5193b101 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 12 Jan 2015 22:29:57 +0100
Subject: ALSA: move line6 usb driver into sound/usb
Promote line6 driver from staging to sound/usb/line6 directory, and
maintain through sound subsystem tree.
This commit just moves the code and adapts Makefile / Kconfig.
The further renames and misc cleanups will follow.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/usb/line6/playback.c | 593 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 593 insertions(+)
create mode 100644 sound/usb/line6/playback.c
(limited to 'sound/usb/line6/playback.c')
diff --git a/sound/usb/line6/playback.c b/sound/usb/line6/playback.c
new file mode 100644
index 000000000000..da2e3b8876b8
--- /dev/null
+++ b/sound/usb/line6/playback.c
@@ -0,0 +1,593 @@
+/*
+ * Line6 Linux USB driver - 0.9.1beta
+ *
+ * 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 "audio.h"
+#include "capture.h"
+#include "driver.h"
+#include "pcm.h"
+#include "pod.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) {
+ short *p, *buf_end;
+
+ p = (short *)urb_out->transfer_buffer;
+ buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
+
+ for (; p < buf_end; ++p) {
+ *p = (*p * volume[chn & 1]) >> 8;
+ ++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;
+ p[0] = val;
+ p[1] = val >> 8;
+ p[2] = val >> 16;
+ ++chn;
+ }
+ }
+}
+
+#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
+
+/*
+ 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;
+ }
+}
+
+#endif
+
+/*
+ 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) {
+ short *pi, *po, *buf_end;
+
+ pi = (short *)signal;
+ po = (short *)urb_out->transfer_buffer;
+ buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
+
+ for (; po < buf_end; ++pi, ++po)
+ *po += (*pi * volume) >> 8;
+ }
+
+ /*
+ 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.
+*/
+static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
+{
+ int index;
+ unsigned long flags;
+ int i, urb_size, urb_frames;
+ int ret;
+ const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
+ const int frame_increment =
+ line6pcm->properties->snd_line6_rates.rats[0].num_min;
+ const int frame_factor =
+ line6pcm->properties->snd_line6_rates.rats[0].den *
+ (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
+ struct urb *urb_out;
+
+ spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
+ index =
+ find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
+
+ if (index < 0 || index >= LINE6_ISO_BUFFERS) {
+ spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+ dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
+ return -EINVAL;
+ }
+
+ urb_out = line6pcm->urb_audio_out[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];
+
+ if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
+ fsize = line6pcm->prev_fsize;
+
+ if (fsize == 0) {
+ int n;
+
+ line6pcm->count_out += frame_increment;
+ n = line6pcm->count_out / frame_factor;
+ line6pcm->count_out -= 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 */
+ spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+ 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->buffer_out +
+ index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
+ urb_out->transfer_buffer_length = urb_size;
+ urb_out->context = line6pcm;
+
+ if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags) &&
+ !test_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags)) {
+ struct snd_pcm_runtime *runtime =
+ get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
+
+ if (line6pcm->pos_out + 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->pos_out;
+
+ if (len > 0) {
+ memcpy(urb_out->transfer_buffer,
+ runtime->dma_area +
+ line6pcm->pos_out * 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->pos_out * bytes_per_frame,
+ urb_out->transfer_buffer_length);
+ }
+
+ line6pcm->pos_out += urb_frames;
+ if (line6pcm->pos_out >= runtime->buffer_size)
+ line6pcm->pos_out -= runtime->buffer_size;
+ } else {
+ memset(urb_out->transfer_buffer, 0,
+ urb_out->transfer_buffer_length);
+ }
+
+ change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
+
+ if (line6pcm->prev_fbuf != NULL) {
+#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
+ if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
+ create_impulse_test_signal(line6pcm, urb_out,
+ bytes_per_frame);
+ if (line6pcm->flags &
+ LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
+ line6_capture_copy(line6pcm,
+ urb_out->transfer_buffer,
+ urb_out->
+ transfer_buffer_length);
+ line6_capture_check_period(line6pcm,
+ urb_out->transfer_buffer_length);
+ }
+ } else {
+#endif
+ if (!
+ (line6pcm->line6->
+ properties->capabilities & LINE6_CAP_HWMON)
+ && (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
+ && (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
+ add_monitor_signal(urb_out, line6pcm->prev_fbuf,
+ line6pcm->volume_monitor,
+ bytes_per_frame);
+#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
+ }
+#endif
+ }
+
+ ret = usb_submit_urb(urb_out, GFP_ATOMIC);
+
+ if (ret == 0)
+ set_bit(index, &line6pcm->active_urb_out);
+ else
+ dev_err(line6pcm->line6->ifcdev,
+ "URB out #%d submission failed (%d)\n", index, ret);
+
+ spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+ return 0;
+}
+
+/*
+ Submit all currently available playback URBs.
+*/
+int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
+{
+ int ret, i;
+
+ for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
+ ret = submit_audio_out_urb(line6pcm);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ Unlink all currently active playback URBs.
+*/
+void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+ unsigned int i;
+
+ for (i = LINE6_ISO_BUFFERS; i--;) {
+ if (test_bit(i, &line6pcm->active_urb_out)) {
+ if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
+ struct urb *u = line6pcm->urb_audio_out[i];
+
+ usb_unlink_urb(u);
+ }
+ }
+ }
+}
+
+/*
+ Wait until unlinking of all currently active playback URBs has been
+ finished.
+*/
+void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+ int timeout = HZ;
+ unsigned int i;
+ int alive;
+
+ do {
+ alive = 0;
+ for (i = LINE6_ISO_BUFFERS; i--;) {
+ if (test_bit(i, &line6pcm->active_urb_out))
+ alive++;
+ }
+ if (!alive)
+ break;
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(1);
+ } while (--timeout > 0);
+ if (alive)
+ snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
+}
+
+/*
+ Unlink all currently active playback URBs, and wait for finishing.
+*/
+void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+ line6_unlink_audio_out_urbs(line6pcm);
+ line6_wait_clear_audio_out_urbs(line6pcm);
+}
+
+void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
+{
+ kfree(line6pcm->buffer_out);
+ line6pcm->buffer_out = NULL;
+}
+
+/*
+ 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->last_frame_out = urb->start_frame;
+
+ /* find index of URB */
+ for (index = LINE6_ISO_BUFFERS; index--;)
+ if (urb == line6pcm->urb_audio_out[index])
+ break;
+
+ if (index < 0)
+ return; /* URB has been unlinked asynchronously */
+
+ for (i = LINE6_ISO_PACKETS; i--;)
+ length += urb->iso_frame_desc[i].length;
+
+ spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
+
+ if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ line6pcm->pos_out_done +=
+ length / line6pcm->properties->bytes_per_frame;
+
+ if (line6pcm->pos_out_done >= runtime->buffer_size)
+ line6pcm->pos_out_done -= runtime->buffer_size;
+ }
+
+ clear_bit(index, &line6pcm->active_urb_out);
+
+ for (i = LINE6_ISO_PACKETS; i--;)
+ if (urb->iso_frame_desc[i].status == -EXDEV) {
+ shutdown = 1;
+ break;
+ }
+
+ if (test_and_clear_bit(index, &line6pcm->unlink_urb_out))
+ shutdown = 1;
+
+ spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+
+ if (!shutdown) {
+ submit_audio_out_urb(line6pcm);
+
+ if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
+ &line6pcm->flags)) {
+ line6pcm->bytes_out += length;
+ if (line6pcm->bytes_out >= line6pcm->period_out) {
+ line6pcm->bytes_out %= line6pcm->period_out;
+ snd_pcm_period_elapsed(substream);
+ }
+ }
+ }
+}
+
+/* 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->snd_line6_rates));
+ if (err < 0)
+ return err;
+
+ runtime->hw = line6pcm->properties->snd_line6_playback_hw;
+ return 0;
+}
+
+/* close playback callback */
+static int snd_line6_playback_close(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+/* hw_params playback callback */
+static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ int ret;
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+ /* -- Florian Demski [FD] */
+ /* don't ask me why, but this fixes the bug on my machine */
+ if (line6pcm == NULL) {
+ if (substream->pcm == NULL)
+ return -ENOMEM;
+ if (substream->pcm->private_data == NULL)
+ return -ENOMEM;
+ substream->private_data = substream->pcm->private_data;
+ line6pcm = snd_pcm_substream_chip(substream);
+ }
+ /* -- [FD] end */
+
+ ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
+
+ if (ret < 0)
+ return ret;
+
+ ret = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (ret < 0) {
+ line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
+ return ret;
+ }
+
+ line6pcm->period_out = params_period_bytes(hw_params);
+ return 0;
+}
+
+/* hw_free playback callback */
+static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+ line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
+ return snd_pcm_lib_free_pages(substream);
+}
+
+/* trigger playback callback */
+int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
+{
+ int err;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+#ifdef CONFIG_PM
+ case SNDRV_PCM_TRIGGER_RESUME:
+#endif
+ err = line6_pcm_acquire(line6pcm,
+ LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
+
+ if (err < 0)
+ return err;
+
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+#ifdef CONFIG_PM
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+#endif
+ err = line6_pcm_release(line6pcm,
+ LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
+
+ if (err < 0)
+ return err;
+
+ break;
+
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
+ break;
+
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* playback pointer callback */
+static snd_pcm_uframes_t
+snd_line6_playback_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+ return line6pcm->pos_out_done;
+}
+
+/* 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_playback_hw_params,
+ .hw_free = snd_line6_playback_hw_free,
+ .prepare = snd_line6_prepare,
+ .trigger = snd_line6_trigger,
+ .pointer = snd_line6_playback_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->urb_audio_out[i] =
+ usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
+
+ if (urb == NULL) {
+ dev_err(line6->ifcdev, "Out of memory\n");
+ 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