[linux-block.git] / sound / usb / line6 / playback.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Line 6 Linux USB driver
 *
 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
 */

#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,
	.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;
}
Commit	Line	Data
a10e763b	1	// SPDX-License-Identifier: GPL-2.0-only
705ececd	2	/*
c078a4aa	3	* Line 6 Linux USB driver
705ececd	4	*
1027f476	5	* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
705ececd MG	6	*/
705ececd MG	7
140e28b8	8	#include <linux/slab.h>
705ececd MG	9	#include <sound/core.h>
	10	#include <sound/pcm.h>
	11	#include <sound/pcm_params.h>
	12
1027f476 MG	13	#include "capture.h"
1027f476 MG	14	#include "driver.h"
705ececd	15	#include "pcm.h"
b702ed25	16	#include "playback.h"
705ececd	17
705ececd MG	18	/*
	19	Software stereo volume control.
	20	*/
010f378e GKH	21	static void change_volume(struct urb *urb_out, int volume[],
010f378e GKH	22	int bytes_per_frame)
705ececd MG	23	{
	24	int chn = 0;
	25
010f378e	26	if (volume[0] == 256 && volume[1] == 256)
45af4977	27	return; /* maximum volume - no change */
705ececd	28
010f378e	29	if (bytes_per_frame == 4) {
0416980d	30	__le16 p, buf_end;
a6b4699d	31
0416980d	32	p = (__le16 *)urb_out->transfer_buffer;
705ececd MG	33	buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
705ececd MG	34
010f378e	35	for (; p < buf_end; ++p) {
0416980d TI	36	short pv = le16_to_cpu(*p);
0416980d TI	37	int val = (pv * volume[chn & 1]) >> 8;
f44f07cf	38	pv = clamp(val, -0x8000, 0x7fff);
0416980d	39	*p = cpu_to_le16(pv);
705ececd MG	40	++chn;
705ececd MG	41	}
010f378e	42	} else if (bytes_per_frame == 6) {
705ececd	43	unsigned char p, buf_end;
f3c5261e	44
705ececd MG	45	p = (unsigned char *)urb_out->transfer_buffer;
	46	buf_end = p + urb_out->transfer_buffer_length;
	47
010f378e GKH	48	for (; p < buf_end; p += 3) {
010f378e GKH	49	int val;
a6b4699d	50
010f378e	51	val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
705ececd	52	val = (val * volume[chn & 1]) >> 8;
f44f07cf	53	val = clamp(val, -0x800000, 0x7fffff);
705ececd MG	54	p[0] = val;
	55	p[1] = val >> 8;
	56	p[2] = val >> 16;
	57	++chn;
	58	}
	59	}
	60	}
	61
1027f476 MG	62	/*
	63	Create signal for impulse response test.
	64	*/
	65	static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
	66	struct urb *urb_out, int bytes_per_frame)
	67	{
	68	int frames = urb_out->transfer_buffer_length / bytes_per_frame;
	69
	70	if (bytes_per_frame == 4) {
e1a164d7 MG	71	int i;
	72	short pi = (short )line6pcm->prev_fbuf;
	73	short po = (short )urb_out->transfer_buffer;
	74
	75	for (i = 0; i < frames; ++i) {
	76	po[0] = pi[0];
	77	po[1] = 0;
	78	pi += 2;
	79	po += 2;
	80	}
1027f476 MG	81	} else if (bytes_per_frame == 6) {
	82	int i, j;
	83	unsigned char *pi = line6pcm->prev_fbuf;
	84	unsigned char *po = urb_out->transfer_buffer;
	85
	86	for (i = 0; i < frames; ++i) {
	87	for (j = 0; j < bytes_per_frame / 2; ++j)
	88	po[j] = pi[j];
	89
	90	for (; j < bytes_per_frame; ++j)
	91	po[j] = 0;
	92
	93	pi += bytes_per_frame;
	94	po += bytes_per_frame;
	95	}
e1a164d7 MG	96	}
	97	if (--line6pcm->impulse_count <= 0) {
	98	((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
	99	1] =
	100	line6pcm->impulse_volume;
	101	line6pcm->impulse_count = line6pcm->impulse_period;
1027f476 MG	102	}
	103	}
	104
1027f476 MG	105	/*
	106	Add signal to buffer for software monitoring.
	107	*/
	108	static void add_monitor_signal(struct urb urb_out, unsigned char signal,
	109	int volume, int bytes_per_frame)
	110	{
	111	if (volume == 0)
	112	return; /* zero volume - no change */
	113
	114	if (bytes_per_frame == 4) {
0416980d	115	__le16 pi, po, *buf_end;
a6b4699d	116
0416980d TI	117	pi = (__le16 *)signal;
0416980d TI	118	po = (__le16 *)urb_out->transfer_buffer;
1027f476 MG	119	buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
1027f476 MG	120
c8491535	121	for (; po < buf_end; ++pi, ++po) {
0416980d TI	122	short pov = le16_to_cpu(*po);
	123	short piv = le16_to_cpu(*pi);
	124	int val = pov + ((piv * volume) >> 8);
f44f07cf	125	pov = clamp(val, -0x8000, 0x7fff);
0416980d	126	*po = cpu_to_le16(pov);
c8491535	127	}
1027f476 MG	128	}
	129
	130	/*
e1a164d7 MG	131	We don't need to handle devices with 6 bytes per frame here
	132	since they all support hardware monitoring.
	133	*/
1027f476 MG	134	}
1027f476 MG	135
705ececd MG	136	/*
705ececd MG	137	Find a free URB, prepare audio data, and submit URB.
3d3ae445	138	must be called in line6pcm->out.lock context
705ececd	139	*/
1027f476	140	static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
705ececd MG	141	{
705ececd MG	142	int index;
705ececd	143	int i, urb_size, urb_frames;
e1a164d7	144	int ret;
97d78acf AK	145	const int bytes_per_frame =
	146	line6pcm->properties->bytes_per_channel *
	147	line6pcm->properties->playback_hw.channels_max;
45af4977	148	const int frame_increment =
1263f611	149	line6pcm->properties->rates.rats[0].num_min;
45af4977	150	const int frame_factor =
1263f611	151	line6pcm->properties->rates.rats[0].den *
79faa2b0	152	(line6pcm->line6->intervals_per_second / LINE6_ISO_INTERVAL);
705ececd MG	153	struct urb *urb_out;
705ececd MG	154
b2233d97 AK	155	index = find_first_zero_bit(&line6pcm->out.active_urbs,
b2233d97 AK	156	line6pcm->line6->iso_buffers);
705ececd	157
b2233d97	158	if (index < 0 \|\| index >= line6pcm->line6->iso_buffers) {
1027f476	159	dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
705ececd MG	160	return -EINVAL;
	161	}
	162
ad0119ab	163	urb_out = line6pcm->out.urbs[index];
705ececd MG	164	urb_size = 0;
705ececd MG	165
97d78acf	166	/* TODO: this may not work for LINE6_ISO_PACKETS != 1 */
010f378e	167	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
705ececd	168	/* compute frame size for given sampling rate */
1027f476	169	int fsize = 0;
45af4977 SB	170	struct usb_iso_packet_descriptor *fout =
45af4977 SB	171	&urb_out->iso_frame_desc[i];
1027f476	172
f2bb614b	173	fsize = line6pcm->prev_fsize;
1027f476 MG	174	if (fsize == 0) {
1027f476 MG	175	int n;
a6b4699d	176
ad0119ab TI	177	line6pcm->out.count += frame_increment;
	178	n = line6pcm->out.count / frame_factor;
	179	line6pcm->out.count -= n * frame_factor;
97d78acf	180	fsize = n;
1027f476 MG	181	}
1027f476 MG	182
97d78acf AK	183	fsize *= bytes_per_frame;
97d78acf AK	184
705ececd	185	fout->offset = urb_size;
1027f476 MG	186	fout->length = fsize;
	187	urb_size += fsize;
	188	}
	189
	190	if (urb_size == 0) {
	191	/* can't determine URB size */
6a8ec876	192	dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
1027f476	193	return -EINVAL;
705ececd MG	194	}
	195
	196	urb_frames = urb_size / bytes_per_frame;
1027f476	197	urb_out->transfer_buffer =
ad0119ab	198	line6pcm->out.buffer +
7a0f55ae	199	index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_out;
1027f476 MG	200	urb_out->transfer_buffer_length = urb_size;
	201	urb_out->context = line6pcm;
	202
63e20df1 TI	203	if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running) &&
63e20df1 TI	204	!test_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags)) {
1027f476 MG	205	struct snd_pcm_runtime *runtime =
1027f476 MG	206	get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
705ececd	207
ad0119ab	208	if (line6pcm->out.pos + urb_frames > runtime->buffer_size) {
705ececd	209	/*
45af4977 SB	210	The transferred area goes over buffer boundary,
	211	copy the data to the temp buffer.
	212	*/
705ececd	213	int len;
a6b4699d	214
ad0119ab	215	len = runtime->buffer_size - line6pcm->out.pos;
705ececd	216
010f378e	217	if (len > 0) {
1027f476	218	memcpy(urb_out->transfer_buffer,
45af4977	219	runtime->dma_area +
ad0119ab	220	line6pcm->out.pos * bytes_per_frame,
45af4977	221	len * bytes_per_frame);
1027f476	222	memcpy(urb_out->transfer_buffer +
45af4977 SB	223	len * bytes_per_frame, runtime->dma_area,
45af4977 SB	224	(urb_frames - len) * bytes_per_frame);
1027f476	225	} else
6a8ec876 SH	226	dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
6a8ec876 SH	227	len);
010f378e	228	} else {
1027f476 MG	229	memcpy(urb_out->transfer_buffer,
1027f476 MG	230	runtime->dma_area +
ad0119ab	231	line6pcm->out.pos * bytes_per_frame,
1027f476	232	urb_out->transfer_buffer_length);
705ececd	233	}
705ececd	234
ad0119ab TI	235	line6pcm->out.pos += urb_frames;
	236	if (line6pcm->out.pos >= runtime->buffer_size)
	237	line6pcm->out.pos -= runtime->buffer_size;
62a109d9 TI	238
	239	change_volume(urb_out, line6pcm->volume_playback,
	240	bytes_per_frame);
1027f476 MG	241	} else {
	242	memset(urb_out->transfer_buffer, 0,
	243	urb_out->transfer_buffer_length);
	244	}
705ececd	245
3d3ae445 TI	246	spin_lock_nested(&line6pcm->in.lock, SINGLE_DEPTH_NESTING);
3d3ae445 TI	247	if (line6pcm->prev_fbuf) {
63e20df1	248	if (test_bit(LINE6_STREAM_IMPULSE, &line6pcm->out.running)) {
1027f476 MG	249	create_impulse_test_signal(line6pcm, urb_out,
1027f476 MG	250	bytes_per_frame);
63e20df1	251	if (test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) {
e1a164d7 MG	252	line6_capture_copy(line6pcm,
	253	urb_out->transfer_buffer,
	254	urb_out->
	255	transfer_buffer_length);
	256	line6_capture_check_period(line6pcm,
30bb0e71	257	urb_out->transfer_buffer_length);
1027f476 MG	258	}
1027f476 MG	259	} else {
63e20df1 TI	260	if (!(line6pcm->line6->properties->capabilities & LINE6_CAP_HWMON)
63e20df1 TI	261	&& line6pcm->out.running && line6pcm->in.running)
1027f476 MG	262	add_monitor_signal(urb_out, line6pcm->prev_fbuf,
	263	line6pcm->volume_monitor,
	264	bytes_per_frame);
1027f476	265	}
f2bb614b TI	266	line6pcm->prev_fbuf = NULL;
f2bb614b TI	267	line6pcm->prev_fsize = 0;
1027f476	268	}
3d3ae445	269	spin_unlock(&line6pcm->in.lock);
705ececd	270
e1a164d7 MG	271	ret = usb_submit_urb(urb_out, GFP_ATOMIC);
	272
	273	if (ret == 0)
ad0119ab	274	set_bit(index, &line6pcm->out.active_urbs);
705ececd	275	else
1027f476	276	dev_err(line6pcm->line6->ifcdev,
e1a164d7	277	"URB out #%d submission failed (%d)\n", index, ret);
705ececd	278
705ececd MG	279	return 0;
	280	}
	281
	282	/*
	283	Submit all currently available playback URBs.
63e20df1 TI	284	must be called in line6pcm->out.lock context
63e20df1 TI	285	*/
1027f476	286	int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
705ececd	287	{
3d3ae445	288	int ret = 0, i;
705ececd	289
b2233d97	290	for (i = 0; i < line6pcm->line6->iso_buffers; ++i) {
1027f476	291	ret = submit_audio_out_urb(line6pcm);
010f378e	292	if (ret < 0)
3d3ae445	293	break;
010f378e	294	}
705ececd	295
3d3ae445	296	return ret;
705ececd MG	297	}
705ececd MG	298
705ececd MG	299	/*
	300	Callback for completed playback URB.
	301	*/
0c7ab158	302	static void audio_out_callback(struct urb *urb)
705ececd MG	303	{
	304	int i, index, length = 0, shutdown = 0;
	305	unsigned long flags;
e1a164d7	306	struct snd_line6_pcm line6pcm = (struct snd_line6_pcm )urb->context;
45af4977	307	struct snd_pcm_substream *substream =
1027f476	308	get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
97d78acf AK	309	const int bytes_per_frame =
	310	line6pcm->properties->bytes_per_channel *
	311	line6pcm->properties->playback_hw.channels_max;
1027f476 MG	312
	313	#if USE_CLEAR_BUFFER_WORKAROUND
	314	memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
	315	#endif
	316
ad0119ab	317	line6pcm->out.last_frame = urb->start_frame;
705ececd MG	318
705ececd MG	319	/* find index of URB */
b2233d97	320	for (index = 0; index < line6pcm->line6->iso_buffers; index++)
ad0119ab	321	if (urb == line6pcm->out.urbs[index])
705ececd MG	322	break;
705ececd MG	323
b2233d97	324	if (index >= line6pcm->line6->iso_buffers)
45af4977	325	return; /* URB has been unlinked asynchronously */
705ececd	326
9fb754b7	327	for (i = 0; i < LINE6_ISO_PACKETS; i++)
705ececd MG	328	length += urb->iso_frame_desc[i].length;
705ececd MG	329
ad0119ab	330	spin_lock_irqsave(&line6pcm->out.lock, flags);
705ececd	331
63e20df1	332	if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
1027f476	333	struct snd_pcm_runtime *runtime = substream->runtime;
f3c5261e	334
ad0119ab	335	line6pcm->out.pos_done +=
97d78acf	336	length / bytes_per_frame;
1027f476	337
ad0119ab TI	338	if (line6pcm->out.pos_done >= runtime->buffer_size)
ad0119ab TI	339	line6pcm->out.pos_done -= runtime->buffer_size;
1027f476	340	}
705ececd	341
ad0119ab	342	clear_bit(index, &line6pcm->out.active_urbs);
705ececd	343
9fb754b7	344	for (i = 0; i < LINE6_ISO_PACKETS; i++)
e1a164d7	345	if (urb->iso_frame_desc[i].status == -EXDEV) {
705ececd MG	346	shutdown = 1;
	347	break;
	348	}
	349
ad0119ab	350	if (test_and_clear_bit(index, &line6pcm->out.unlink_urbs))
705ececd MG	351	shutdown = 1;
705ececd MG	352
010f378e	353	if (!shutdown) {
1027f476	354	submit_audio_out_urb(line6pcm);
705ececd	355
63e20df1	356	if (test_bit(LINE6_STREAM_PCM, &line6pcm->out.running)) {
ad0119ab TI	357	line6pcm->out.bytes += length;
	358	if (line6pcm->out.bytes >= line6pcm->out.period) {
	359	line6pcm->out.bytes %= line6pcm->out.period;
3d3ae445	360	spin_unlock(&line6pcm->out.lock);
1027f476	361	snd_pcm_period_elapsed(substream);
3d3ae445	362	spin_lock(&line6pcm->out.lock);
1027f476	363	}
705ececd MG	364	}
705ececd MG	365	}
3d3ae445	366	spin_unlock_irqrestore(&line6pcm->out.lock, flags);
705ececd MG	367	}
	368
	369	/* open playback callback */
	370	static int snd_line6_playback_open(struct snd_pcm_substream *substream)
	371	{
	372	int err;
	373	struct snd_pcm_runtime *runtime = substream->runtime;
	374	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	375
010f378e	376	err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1263f611	377	&line6pcm->properties->rates);
010f378e	378	if (err < 0)
705ececd MG	379	return err;
705ececd MG	380
1263f611	381	runtime->hw = line6pcm->properties->playback_hw;
705ececd MG	382	return 0;
	383	}
	384
	385	/* close playback callback */
	386	static int snd_line6_playback_close(struct snd_pcm_substream *substream)
	387	{
	388	return 0;
	389	}
	390
705ececd	391	/* playback operators */
e195a331	392	const struct snd_pcm_ops snd_line6_playback_ops = {
e1a164d7 MG	393	.open = snd_line6_playback_open,
e1a164d7 MG	394	.close = snd_line6_playback_close,
63e20df1 TI	395	.hw_params = snd_line6_hw_params,
63e20df1 TI	396	.hw_free = snd_line6_hw_free,
e1a164d7 MG	397	.prepare = snd_line6_prepare,
e1a164d7 MG	398	.trigger = snd_line6_trigger,
2954f914	399	.pointer = snd_line6_pointer,
705ececd MG	400	};
705ececd MG	401
1027f476	402	int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
705ececd	403	{
16d603d3	404	struct usb_line6 *line6 = line6pcm->line6;
705ececd MG	405	int i;
705ececd MG	406
6396bb22 KC	407	line6pcm->out.urbs = kcalloc(line6->iso_buffers, sizeof(struct urb *),
6396bb22 KC	408	GFP_KERNEL);
b2233d97 AK	409	if (line6pcm->out.urbs == NULL)
	410	return -ENOMEM;
	411
705ececd	412	/* create audio URBs and fill in constant values: */
b2233d97	413	for (i = 0; i < line6->iso_buffers; ++i) {
705ececd MG	414	struct urb *urb;
	415
	416	/* URB for audio out: */
ad0119ab	417	urb = line6pcm->out.urbs[i] =
45af4977	418	usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
705ececd	419
a019f5e8	420	if (urb == NULL)
705ececd	421	return -ENOMEM;
705ececd	422
16d603d3	423	urb->dev = line6->usbdev;
45af4977	424	urb->pipe =
16d603d3 CR	425	usb_sndisocpipe(line6->usbdev,
16d603d3 CR	426	line6->properties->ep_audio_w &
e1a164d7	427	USB_ENDPOINT_NUMBER_MASK);
705ececd MG	428	urb->transfer_flags = URB_ISO_ASAP;
	429	urb->start_frame = -1;
	430	urb->number_of_packets = LINE6_ISO_PACKETS;
	431	urb->interval = LINE6_ISO_INTERVAL;
	432	urb->error_count = 0;
	433	urb->complete = audio_out_callback;
6e8a914a TI	434	if (usb_urb_ep_type_check(urb))
6e8a914a TI	435	return -EINVAL;
705ececd MG	436	}
	437
	438	return 0;
	439	}