[mirror_ubuntu-zesty-kernel.git] / sound / usb / line6 / playback.c

/*
 * 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 */
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 = kzalloc(
		sizeof(struct urb *) * line6->iso_buffers, 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;
	}

	return 0;
}
Commit	Line	Data
705ececd	1	/*
c078a4aa	2	* Line 6 Linux USB driver
705ececd	3	*
1027f476	4	* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
705ececd MG	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation, version 2.
	9	*
	10	*/
	11
140e28b8	12	#include <linux/slab.h>
705ececd MG	13	#include <sound/core.h>
	14	#include <sound/pcm.h>
	15	#include <sound/pcm_params.h>
	16
1027f476 MG	17	#include "capture.h"
1027f476 MG	18	#include "driver.h"
705ececd	19	#include "pcm.h"
b702ed25	20	#include "playback.h"
705ececd	21
705ececd MG	22	/*
	23	Software stereo volume control.
	24	*/
010f378e GKH	25	static void change_volume(struct urb *urb_out, int volume[],
010f378e GKH	26	int bytes_per_frame)
705ececd MG	27	{
	28	int chn = 0;
	29
010f378e	30	if (volume[0] == 256 && volume[1] == 256)
45af4977	31	return; /* maximum volume - no change */
705ececd	32
010f378e	33	if (bytes_per_frame == 4) {
0416980d	34	__le16 p, buf_end;
a6b4699d	35
0416980d	36	p = (__le16 *)urb_out->transfer_buffer;
705ececd MG	37	buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
705ececd MG	38
010f378e	39	for (; p < buf_end; ++p) {
0416980d TI	40	short pv = le16_to_cpu(*p);
0416980d TI	41	int val = (pv * volume[chn & 1]) >> 8;
f44f07cf	42	pv = clamp(val, -0x8000, 0x7fff);
0416980d	43	*p = cpu_to_le16(pv);
705ececd MG	44	++chn;
705ececd MG	45	}
010f378e	46	} else if (bytes_per_frame == 6) {
705ececd	47	unsigned char p, buf_end;
f3c5261e	48
705ececd MG	49	p = (unsigned char *)urb_out->transfer_buffer;
	50	buf_end = p + urb_out->transfer_buffer_length;
	51
010f378e GKH	52	for (; p < buf_end; p += 3) {
010f378e GKH	53	int val;
a6b4699d	54
010f378e	55	val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
705ececd	56	val = (val * volume[chn & 1]) >> 8;
f44f07cf	57	val = clamp(val, -0x800000, 0x7fffff);
705ececd MG	58	p[0] = val;
	59	p[1] = val >> 8;
	60	p[2] = val >> 16;
	61	++chn;
	62	}
	63	}
	64	}
	65
1027f476 MG	66	/*
	67	Create signal for impulse response test.
	68	*/
	69	static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
	70	struct urb *urb_out, int bytes_per_frame)
	71	{
	72	int frames = urb_out->transfer_buffer_length / bytes_per_frame;
	73
	74	if (bytes_per_frame == 4) {
e1a164d7 MG	75	int i;
	76	short pi = (short )line6pcm->prev_fbuf;
	77	short po = (short )urb_out->transfer_buffer;
	78
	79	for (i = 0; i < frames; ++i) {
	80	po[0] = pi[0];
	81	po[1] = 0;
	82	pi += 2;
	83	po += 2;
	84	}
1027f476 MG	85	} else if (bytes_per_frame == 6) {
	86	int i, j;
	87	unsigned char *pi = line6pcm->prev_fbuf;
	88	unsigned char *po = urb_out->transfer_buffer;
	89
	90	for (i = 0; i < frames; ++i) {
	91	for (j = 0; j < bytes_per_frame / 2; ++j)
	92	po[j] = pi[j];
	93
	94	for (; j < bytes_per_frame; ++j)
	95	po[j] = 0;
	96
	97	pi += bytes_per_frame;
	98	po += bytes_per_frame;
	99	}
e1a164d7 MG	100	}
	101	if (--line6pcm->impulse_count <= 0) {
	102	((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
	103	1] =
	104	line6pcm->impulse_volume;
	105	line6pcm->impulse_count = line6pcm->impulse_period;
1027f476 MG	106	}
	107	}
	108
1027f476 MG	109	/*
	110	Add signal to buffer for software monitoring.
	111	*/
	112	static void add_monitor_signal(struct urb urb_out, unsigned char signal,
	113	int volume, int bytes_per_frame)
	114	{
	115	if (volume == 0)
	116	return; /* zero volume - no change */
	117
	118	if (bytes_per_frame == 4) {
0416980d	119	__le16 pi, po, *buf_end;
a6b4699d	120
0416980d TI	121	pi = (__le16 *)signal;
0416980d TI	122	po = (__le16 *)urb_out->transfer_buffer;
1027f476 MG	123	buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
1027f476 MG	124
c8491535	125	for (; po < buf_end; ++pi, ++po) {
0416980d TI	126	short pov = le16_to_cpu(*po);
	127	short piv = le16_to_cpu(*pi);
	128	int val = pov + ((piv * volume) >> 8);
f44f07cf	129	pov = clamp(val, -0x8000, 0x7fff);
0416980d	130	*po = cpu_to_le16(pov);
c8491535	131	}
1027f476 MG	132	}
	133
	134	/*
e1a164d7 MG	135	We don't need to handle devices with 6 bytes per frame here
	136	since they all support hardware monitoring.
	137	*/
1027f476 MG	138	}
1027f476 MG	139
705ececd MG	140	/*
705ececd MG	141	Find a free URB, prepare audio data, and submit URB.
3d3ae445	142	must be called in line6pcm->out.lock context
705ececd	143	*/
1027f476	144	static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
705ececd MG	145	{
705ececd MG	146	int index;
705ececd	147	int i, urb_size, urb_frames;
e1a164d7	148	int ret;
97d78acf AK	149	const int bytes_per_frame =
	150	line6pcm->properties->bytes_per_channel *
	151	line6pcm->properties->playback_hw.channels_max;
45af4977	152	const int frame_increment =
1263f611	153	line6pcm->properties->rates.rats[0].num_min;
45af4977	154	const int frame_factor =
1263f611	155	line6pcm->properties->rates.rats[0].den *
79faa2b0	156	(line6pcm->line6->intervals_per_second / LINE6_ISO_INTERVAL);
705ececd MG	157	struct urb *urb_out;
705ececd MG	158
b2233d97 AK	159	index = find_first_zero_bit(&line6pcm->out.active_urbs,
b2233d97 AK	160	line6pcm->line6->iso_buffers);
705ececd	161
b2233d97	162	if (index < 0 \|\| index >= line6pcm->line6->iso_buffers) {
1027f476	163	dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
705ececd MG	164	return -EINVAL;
	165	}
	166
ad0119ab	167	urb_out = line6pcm->out.urbs[index];
705ececd MG	168	urb_size = 0;
705ececd MG	169
97d78acf	170	/* TODO: this may not work for LINE6_ISO_PACKETS != 1 */
010f378e	171	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
705ececd	172	/* compute frame size for given sampling rate */
1027f476	173	int fsize = 0;
45af4977 SB	174	struct usb_iso_packet_descriptor *fout =
45af4977 SB	175	&urb_out->iso_frame_desc[i];
1027f476	176
f2bb614b	177	fsize = line6pcm->prev_fsize;
1027f476 MG	178	if (fsize == 0) {
1027f476 MG	179	int n;
a6b4699d	180
ad0119ab TI	181	line6pcm->out.count += frame_increment;
	182	n = line6pcm->out.count / frame_factor;
	183	line6pcm->out.count -= n * frame_factor;
97d78acf	184	fsize = n;
1027f476 MG	185	}
1027f476 MG	186
97d78acf AK	187	fsize *= bytes_per_frame;
97d78acf AK	188
705ececd	189	fout->offset = urb_size;
1027f476 MG	190	fout->length = fsize;
	191	urb_size += fsize;
	192	}
	193
	194	if (urb_size == 0) {
	195	/* can't determine URB size */
6a8ec876	196	dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
1027f476	197	return -EINVAL;
705ececd MG	198	}
	199
	200	urb_frames = urb_size / bytes_per_frame;
1027f476	201	urb_out->transfer_buffer =
ad0119ab	202	line6pcm->out.buffer +
7a0f55ae	203	index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_out;
1027f476 MG	204	urb_out->transfer_buffer_length = urb_size;
	205	urb_out->context = line6pcm;
	206
63e20df1 TI	207	if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running) &&
63e20df1 TI	208	!test_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags)) {
1027f476 MG	209	struct snd_pcm_runtime *runtime =
1027f476 MG	210	get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
705ececd	211
ad0119ab	212	if (line6pcm->out.pos + urb_frames > runtime->buffer_size) {
705ececd	213	/*
45af4977 SB	214	The transferred area goes over buffer boundary,
	215	copy the data to the temp buffer.
	216	*/
705ececd	217	int len;
a6b4699d	218
ad0119ab	219	len = runtime->buffer_size - line6pcm->out.pos;
705ececd	220
010f378e	221	if (len > 0) {
1027f476	222	memcpy(urb_out->transfer_buffer,
45af4977	223	runtime->dma_area +
ad0119ab	224	line6pcm->out.pos * bytes_per_frame,
45af4977	225	len * bytes_per_frame);
1027f476	226	memcpy(urb_out->transfer_buffer +
45af4977 SB	227	len * bytes_per_frame, runtime->dma_area,
45af4977 SB	228	(urb_frames - len) * bytes_per_frame);
1027f476	229	} else
6a8ec876 SH	230	dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
6a8ec876 SH	231	len);
010f378e	232	} else {
1027f476 MG	233	memcpy(urb_out->transfer_buffer,
1027f476 MG	234	runtime->dma_area +
ad0119ab	235	line6pcm->out.pos * bytes_per_frame,
1027f476	236	urb_out->transfer_buffer_length);
705ececd	237	}
705ececd	238
ad0119ab TI	239	line6pcm->out.pos += urb_frames;
	240	if (line6pcm->out.pos >= runtime->buffer_size)
	241	line6pcm->out.pos -= runtime->buffer_size;
62a109d9 TI	242
	243	change_volume(urb_out, line6pcm->volume_playback,
	244	bytes_per_frame);
1027f476 MG	245	} else {
	246	memset(urb_out->transfer_buffer, 0,
	247	urb_out->transfer_buffer_length);
	248	}
705ececd	249
3d3ae445 TI	250	spin_lock_nested(&line6pcm->in.lock, SINGLE_DEPTH_NESTING);
3d3ae445 TI	251	if (line6pcm->prev_fbuf) {
63e20df1	252	if (test_bit(LINE6_STREAM_IMPULSE, &line6pcm->out.running)) {
1027f476 MG	253	create_impulse_test_signal(line6pcm, urb_out,
1027f476 MG	254	bytes_per_frame);
63e20df1	255	if (test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) {
e1a164d7 MG	256	line6_capture_copy(line6pcm,
	257	urb_out->transfer_buffer,
	258	urb_out->
	259	transfer_buffer_length);
	260	line6_capture_check_period(line6pcm,
30bb0e71	261	urb_out->transfer_buffer_length);
1027f476 MG	262	}
1027f476 MG	263	} else {
63e20df1 TI	264	if (!(line6pcm->line6->properties->capabilities & LINE6_CAP_HWMON)
63e20df1 TI	265	&& line6pcm->out.running && line6pcm->in.running)
1027f476 MG	266	add_monitor_signal(urb_out, line6pcm->prev_fbuf,
	267	line6pcm->volume_monitor,
	268	bytes_per_frame);
1027f476	269	}
f2bb614b TI	270	line6pcm->prev_fbuf = NULL;
f2bb614b TI	271	line6pcm->prev_fsize = 0;
1027f476	272	}
3d3ae445	273	spin_unlock(&line6pcm->in.lock);
705ececd	274
e1a164d7 MG	275	ret = usb_submit_urb(urb_out, GFP_ATOMIC);
	276
	277	if (ret == 0)
ad0119ab	278	set_bit(index, &line6pcm->out.active_urbs);
705ececd	279	else
1027f476	280	dev_err(line6pcm->line6->ifcdev,
e1a164d7	281	"URB out #%d submission failed (%d)\n", index, ret);
705ececd	282
705ececd MG	283	return 0;
	284	}
	285
	286	/*
	287	Submit all currently available playback URBs.
63e20df1 TI	288	must be called in line6pcm->out.lock context
63e20df1 TI	289	*/
1027f476	290	int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
705ececd	291	{
3d3ae445	292	int ret = 0, i;
705ececd	293
b2233d97	294	for (i = 0; i < line6pcm->line6->iso_buffers; ++i) {
1027f476	295	ret = submit_audio_out_urb(line6pcm);
010f378e	296	if (ret < 0)
3d3ae445	297	break;
010f378e	298	}
705ececd	299
3d3ae445	300	return ret;
705ececd MG	301	}
705ececd MG	302
705ececd MG	303	/*
	304	Callback for completed playback URB.
	305	*/
0c7ab158	306	static void audio_out_callback(struct urb *urb)
705ececd MG	307	{
	308	int i, index, length = 0, shutdown = 0;
	309	unsigned long flags;
e1a164d7	310	struct snd_line6_pcm line6pcm = (struct snd_line6_pcm )urb->context;
45af4977	311	struct snd_pcm_substream *substream =
1027f476	312	get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
97d78acf AK	313	const int bytes_per_frame =
	314	line6pcm->properties->bytes_per_channel *
	315	line6pcm->properties->playback_hw.channels_max;
1027f476 MG	316
	317	#if USE_CLEAR_BUFFER_WORKAROUND
	318	memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
	319	#endif
	320
ad0119ab	321	line6pcm->out.last_frame = urb->start_frame;
705ececd MG	322
705ececd MG	323	/* find index of URB */
b2233d97	324	for (index = 0; index < line6pcm->line6->iso_buffers; index++)
ad0119ab	325	if (urb == line6pcm->out.urbs[index])
705ececd MG	326	break;
705ececd MG	327
b2233d97	328	if (index >= line6pcm->line6->iso_buffers)
45af4977	329	return; /* URB has been unlinked asynchronously */
705ececd	330
9fb754b7	331	for (i = 0; i < LINE6_ISO_PACKETS; i++)
705ececd MG	332	length += urb->iso_frame_desc[i].length;
705ececd MG	333
ad0119ab	334	spin_lock_irqsave(&line6pcm->out.lock, flags);
705ececd	335
63e20df1	336	if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
1027f476	337	struct snd_pcm_runtime *runtime = substream->runtime;
f3c5261e	338
ad0119ab	339	line6pcm->out.pos_done +=
97d78acf	340	length / bytes_per_frame;
1027f476	341
ad0119ab TI	342	if (line6pcm->out.pos_done >= runtime->buffer_size)
ad0119ab TI	343	line6pcm->out.pos_done -= runtime->buffer_size;
1027f476	344	}
705ececd	345
ad0119ab	346	clear_bit(index, &line6pcm->out.active_urbs);
705ececd	347
9fb754b7	348	for (i = 0; i < LINE6_ISO_PACKETS; i++)
e1a164d7	349	if (urb->iso_frame_desc[i].status == -EXDEV) {
705ececd MG	350	shutdown = 1;
	351	break;
	352	}
	353
ad0119ab	354	if (test_and_clear_bit(index, &line6pcm->out.unlink_urbs))
705ececd MG	355	shutdown = 1;
705ececd MG	356
010f378e	357	if (!shutdown) {
1027f476	358	submit_audio_out_urb(line6pcm);
705ececd	359
63e20df1	360	if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
ad0119ab TI	361	line6pcm->out.bytes += length;
	362	if (line6pcm->out.bytes >= line6pcm->out.period) {
	363	line6pcm->out.bytes %= line6pcm->out.period;
3d3ae445	364	spin_unlock(&line6pcm->out.lock);
1027f476	365	snd_pcm_period_elapsed(substream);
3d3ae445	366	spin_lock(&line6pcm->out.lock);
1027f476	367	}
705ececd MG	368	}
705ececd MG	369	}
3d3ae445	370	spin_unlock_irqrestore(&line6pcm->out.lock, flags);
705ececd MG	371	}
	372
	373	/* open playback callback */
	374	static int snd_line6_playback_open(struct snd_pcm_substream *substream)
	375	{
	376	int err;
	377	struct snd_pcm_runtime *runtime = substream->runtime;
	378	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	379
010f378e	380	err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1263f611	381	&line6pcm->properties->rates);
010f378e	382	if (err < 0)
705ececd MG	383	return err;
705ececd MG	384
1263f611	385	runtime->hw = line6pcm->properties->playback_hw;
705ececd MG	386	return 0;
	387	}
	388
	389	/* close playback callback */
	390	static int snd_line6_playback_close(struct snd_pcm_substream *substream)
	391	{
	392	return 0;
	393	}
	394
705ececd MG	395	/* playback operators */
705ececd MG	396	struct snd_pcm_ops snd_line6_playback_ops = {
e1a164d7 MG	397	.open = snd_line6_playback_open,
	398	.close = snd_line6_playback_close,
	399	.ioctl = snd_pcm_lib_ioctl,
63e20df1 TI	400	.hw_params = snd_line6_hw_params,
63e20df1 TI	401	.hw_free = snd_line6_hw_free,
e1a164d7 MG	402	.prepare = snd_line6_prepare,
e1a164d7 MG	403	.trigger = snd_line6_trigger,
2954f914	404	.pointer = snd_line6_pointer,
705ececd MG	405	};
705ececd MG	406
1027f476	407	int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
705ececd	408	{
16d603d3	409	struct usb_line6 *line6 = line6pcm->line6;
705ececd MG	410	int i;
705ececd MG	411
b2233d97 AK	412	line6pcm->out.urbs = kzalloc(
	413	sizeof(struct urb ) line6->iso_buffers, GFP_KERNEL);
	414	if (line6pcm->out.urbs == NULL)
	415	return -ENOMEM;
	416
705ececd	417	/* create audio URBs and fill in constant values: */
b2233d97	418	for (i = 0; i < line6->iso_buffers; ++i) {
705ececd MG	419	struct urb *urb;
	420
	421	/* URB for audio out: */
ad0119ab	422	urb = line6pcm->out.urbs[i] =
45af4977	423	usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
705ececd	424
a019f5e8	425	if (urb == NULL)
705ececd	426	return -ENOMEM;
705ececd	427
16d603d3	428	urb->dev = line6->usbdev;
45af4977	429	urb->pipe =
16d603d3 CR	430	usb_sndisocpipe(line6->usbdev,
16d603d3 CR	431	line6->properties->ep_audio_w &
e1a164d7	432	USB_ENDPOINT_NUMBER_MASK);
705ececd MG	433	urb->transfer_flags = URB_ISO_ASAP;
	434	urb->start_frame = -1;
	435	urb->number_of_packets = LINE6_ISO_PACKETS;
	436	urb->interval = LINE6_ISO_INTERVAL;
	437	urb->error_count = 0;
	438	urb->complete = audio_out_callback;
	439	}
	440
	441	return 0;
	442	}