[linux-block.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) {
		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) {
			int val = (*p * volume[chn & 1]) >> 8;
			*p = clamp(val, 0x7fff, -0x8000);
			++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, 0x7fffff, -0x800000);
			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) {
		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) {
			int val = *po + ((*pi * volume) >> 8);
			*po = clamp(val, 0x7fff, -0x8000);
		}
	}

	/*
	   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->out.lock, flags);
	index =
	    find_first_zero_bit(&line6pcm->out.active_urbs, LINE6_ISO_BUFFERS);

	if (index < 0 || index >= LINE6_ISO_BUFFERS) {
		spin_unlock_irqrestore(&line6pcm->out.lock, flags);
		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];

		if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
			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 */
		spin_unlock_irqrestore(&line6pcm->out.lock, 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->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_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->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);
	}

	if (line6pcm->prev_fbuf != NULL) {
		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 {
			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);
		}
	}

	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);

	spin_unlock_irqrestore(&line6pcm->out.lock, 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;
}

/*
	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_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
		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;

	spin_unlock_irqrestore(&line6pcm->out.lock, flags);

	if (!shutdown) {
		submit_audio_out_urb(line6pcm);

		if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
			     &line6pcm->flags)) {
			line6pcm->out.bytes += length;
			if (line6pcm->out.bytes >= line6pcm->out.period) {
				line6pcm->out.bytes %= line6pcm->out.period;
				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);

	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->out.period = 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:
	case SNDRV_PCM_TRIGGER_RESUME:
		err = line6_pcm_acquire(line6pcm,
					LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);

		if (err < 0)
			return err;

		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		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->out.pos_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->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) {
705ececd	34	short p, buf_end;
a6b4699d	35
705ececd MG	36	p = (short *)urb_out->transfer_buffer;
	37	buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
	38
010f378e	39	for (; p < buf_end; ++p) {
c8491535 TI	40	int val = (p volume[chn & 1]) >> 8;
c8491535 TI	41	*p = clamp(val, 0x7fff, -0x8000);
705ececd MG	42	++chn;
705ececd MG	43	}
010f378e	44	} else if (bytes_per_frame == 6) {
705ececd	45	unsigned char p, buf_end;
f3c5261e	46
705ececd MG	47	p = (unsigned char *)urb_out->transfer_buffer;
	48	buf_end = p + urb_out->transfer_buffer_length;
	49
010f378e GKH	50	for (; p < buf_end; p += 3) {
010f378e GKH	51	int val;
a6b4699d	52
010f378e	53	val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
705ececd	54	val = (val * volume[chn & 1]) >> 8;
c8491535	55	val = clamp(val, 0x7fffff, -0x800000);
705ececd MG	56	p[0] = val;
	57	p[1] = val >> 8;
	58	p[2] = val >> 16;
	59	++chn;
	60	}
	61	}
	62	}
	63
1027f476 MG	64	/*
	65	Create signal for impulse response test.
	66	*/
	67	static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
	68	struct urb *urb_out, int bytes_per_frame)
	69	{
	70	int frames = urb_out->transfer_buffer_length / bytes_per_frame;
	71
	72	if (bytes_per_frame == 4) {
e1a164d7 MG	73	int i;
	74	short pi = (short )line6pcm->prev_fbuf;
	75	short po = (short )urb_out->transfer_buffer;
	76
	77	for (i = 0; i < frames; ++i) {
	78	po[0] = pi[0];
	79	po[1] = 0;
	80	pi += 2;
	81	po += 2;
	82	}
1027f476 MG	83	} else if (bytes_per_frame == 6) {
	84	int i, j;
	85	unsigned char *pi = line6pcm->prev_fbuf;
	86	unsigned char *po = urb_out->transfer_buffer;
	87
	88	for (i = 0; i < frames; ++i) {
	89	for (j = 0; j < bytes_per_frame / 2; ++j)
	90	po[j] = pi[j];
	91
	92	for (; j < bytes_per_frame; ++j)
	93	po[j] = 0;
	94
	95	pi += bytes_per_frame;
	96	po += bytes_per_frame;
	97	}
e1a164d7 MG	98	}
	99	if (--line6pcm->impulse_count <= 0) {
	100	((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
	101	1] =
	102	line6pcm->impulse_volume;
	103	line6pcm->impulse_count = line6pcm->impulse_period;
1027f476 MG	104	}
	105	}
	106
1027f476 MG	107	/*
	108	Add signal to buffer for software monitoring.
	109	*/
	110	static void add_monitor_signal(struct urb urb_out, unsigned char signal,
	111	int volume, int bytes_per_frame)
	112	{
	113	if (volume == 0)
	114	return; /* zero volume - no change */
	115
	116	if (bytes_per_frame == 4) {
	117	short pi, po, *buf_end;
a6b4699d	118
1027f476 MG	119	pi = (short *)signal;
	120	po = (short *)urb_out->transfer_buffer;
	121	buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
	122
c8491535 TI	123	for (; po < buf_end; ++pi, ++po) {
	124	int val = po + ((pi * volume) >> 8);
	125	*po = clamp(val, 0x7fff, -0x8000);
	126	}
1027f476 MG	127	}
	128
	129	/*
e1a164d7 MG	130	We don't need to handle devices with 6 bytes per frame here
	131	since they all support hardware monitoring.
	132	*/
1027f476 MG	133	}
1027f476 MG	134
705ececd MG	135	/*
	136	Find a free URB, prepare audio data, and submit URB.
	137	*/
1027f476	138	static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
705ececd MG	139	{
	140	int index;
	141	unsigned long flags;
	142	int i, urb_size, urb_frames;
e1a164d7	143	int ret;
705ececd	144	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
45af4977 SB	145	const int frame_increment =
	146	line6pcm->properties->snd_line6_rates.rats[0].num_min;
	147	const int frame_factor =
	148	line6pcm->properties->snd_line6_rates.rats[0].den *
	149	(USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
705ececd MG	150	struct urb *urb_out;
705ececd MG	151
ad0119ab	152	spin_lock_irqsave(&line6pcm->out.lock, flags);
45af4977	153	index =
ad0119ab	154	find_first_zero_bit(&line6pcm->out.active_urbs, LINE6_ISO_BUFFERS);
705ececd	155
010f378e	156	if (index < 0 \|\| index >= LINE6_ISO_BUFFERS) {
ad0119ab	157	spin_unlock_irqrestore(&line6pcm->out.lock, flags);
1027f476	158	dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
705ececd MG	159	return -EINVAL;
	160	}
	161
ad0119ab	162	urb_out = line6pcm->out.urbs[index];
705ececd MG	163	urb_size = 0;
705ececd MG	164
010f378e	165	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
705ececd	166	/* compute frame size for given sampling rate */
1027f476	167	int fsize = 0;
45af4977 SB	168	struct usb_iso_packet_descriptor *fout =
45af4977 SB	169	&urb_out->iso_frame_desc[i];
1027f476	170
0ca54888	171	if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
1027f476	172	fsize = line6pcm->prev_fsize;
1027f476 MG	173
	174	if (fsize == 0) {
	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;
1027f476 MG	180	fsize = n * bytes_per_frame;
	181	}
	182
705ececd	183	fout->offset = urb_size;
1027f476 MG	184	fout->length = fsize;
	185	urb_size += fsize;
	186	}
	187
	188	if (urb_size == 0) {
	189	/* can't determine URB size */
ad0119ab	190	spin_unlock_irqrestore(&line6pcm->out.lock, flags);
6a8ec876	191	dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
1027f476	192	return -EINVAL;
705ececd MG	193	}
	194
	195	urb_frames = urb_size / bytes_per_frame;
1027f476	196	urb_out->transfer_buffer =
ad0119ab	197	line6pcm->out.buffer +
153e3876	198	index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
1027f476 MG	199	urb_out->transfer_buffer_length = urb_size;
	200	urb_out->context = line6pcm;
	201
0ca54888 MG	202	if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags) &&
0ca54888 MG	203	!test_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags)) {
1027f476 MG	204	struct snd_pcm_runtime *runtime =
1027f476 MG	205	get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
705ececd	206
ad0119ab	207	if (line6pcm->out.pos + urb_frames > runtime->buffer_size) {
705ececd	208	/*
45af4977 SB	209	The transferred area goes over buffer boundary,
	210	copy the data to the temp buffer.
	211	*/
705ececd	212	int len;
a6b4699d	213
ad0119ab	214	len = runtime->buffer_size - line6pcm->out.pos;
705ececd	215
010f378e	216	if (len > 0) {
1027f476	217	memcpy(urb_out->transfer_buffer,
45af4977	218	runtime->dma_area +
ad0119ab	219	line6pcm->out.pos * bytes_per_frame,
45af4977	220	len * bytes_per_frame);
1027f476	221	memcpy(urb_out->transfer_buffer +
45af4977 SB	222	len * bytes_per_frame, runtime->dma_area,
45af4977 SB	223	(urb_frames - len) * bytes_per_frame);
1027f476	224	} else
6a8ec876 SH	225	dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
6a8ec876 SH	226	len);
010f378e	227	} else {
1027f476 MG	228	memcpy(urb_out->transfer_buffer,
1027f476 MG	229	runtime->dma_area +
ad0119ab	230	line6pcm->out.pos * bytes_per_frame,
1027f476	231	urb_out->transfer_buffer_length);
705ececd	232	}
705ececd	233
ad0119ab TI	234	line6pcm->out.pos += urb_frames;
	235	if (line6pcm->out.pos >= runtime->buffer_size)
	236	line6pcm->out.pos -= runtime->buffer_size;
62a109d9 TI	237
	238	change_volume(urb_out, line6pcm->volume_playback,
	239	bytes_per_frame);
1027f476 MG	240	} else {
	241	memset(urb_out->transfer_buffer, 0,
	242	urb_out->transfer_buffer_length);
	243	}
705ececd	244
597a1e7c	245	if (line6pcm->prev_fbuf != NULL) {
0ca54888	246	if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
1027f476 MG	247	create_impulse_test_signal(line6pcm, urb_out,
1027f476 MG	248	bytes_per_frame);
30bb0e71 EA	249	if (line6pcm->flags &
30bb0e71 EA	250	LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
e1a164d7 MG	251	line6_capture_copy(line6pcm,
	252	urb_out->transfer_buffer,
	253	urb_out->
	254	transfer_buffer_length);
	255	line6_capture_check_period(line6pcm,
30bb0e71	256	urb_out->transfer_buffer_length);
1027f476 MG	257	}
1027f476 MG	258	} else {
1027f476	259	if (!
e1a164d7	260	(line6pcm->line6->
4cb1a4ae	261	properties->capabilities & LINE6_CAP_HWMON)
0ca54888 MG	262	&& (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
0ca54888 MG	263	&& (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
1027f476 MG	264	add_monitor_signal(urb_out, line6pcm->prev_fbuf,
	265	line6pcm->volume_monitor,
	266	bytes_per_frame);
1027f476	267	}
1027f476	268	}
705ececd	269
e1a164d7 MG	270	ret = usb_submit_urb(urb_out, GFP_ATOMIC);
	271
	272	if (ret == 0)
ad0119ab	273	set_bit(index, &line6pcm->out.active_urbs);
705ececd	274	else
1027f476	275	dev_err(line6pcm->line6->ifcdev,
e1a164d7	276	"URB out #%d submission failed (%d)\n", index, ret);
705ececd	277
ad0119ab	278	spin_unlock_irqrestore(&line6pcm->out.lock, flags);
705ececd MG	279	return 0;
	280	}
	281
	282	/*
	283	Submit all currently available playback URBs.
	284	*/
1027f476	285	int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
705ececd MG	286	{
	287	int ret, i;
	288
010f378e	289	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
1027f476	290	ret = submit_audio_out_urb(line6pcm);
010f378e	291	if (ret < 0)
705ececd	292	return ret;
010f378e	293	}
705ececd MG	294
	295	return 0;
	296	}
	297
705ececd MG	298	/*
	299	Callback for completed playback URB.
	300	*/
0c7ab158	301	static void audio_out_callback(struct urb *urb)
705ececd MG	302	{
	303	int i, index, length = 0, shutdown = 0;
	304	unsigned long flags;
e1a164d7	305	struct snd_line6_pcm line6pcm = (struct snd_line6_pcm )urb->context;
45af4977	306	struct snd_pcm_substream *substream =
1027f476 MG	307	get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
	308
	309	#if USE_CLEAR_BUFFER_WORKAROUND
	310	memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
	311	#endif
	312
ad0119ab	313	line6pcm->out.last_frame = urb->start_frame;
705ececd MG	314
705ececd MG	315	/* find index of URB */
9fb754b7	316	for (index = 0; index < LINE6_ISO_BUFFERS; index++)
ad0119ab	317	if (urb == line6pcm->out.urbs[index])
705ececd MG	318	break;
705ececd MG	319
9fb754b7	320	if (index >= LINE6_ISO_BUFFERS)
45af4977	321	return; /* URB has been unlinked asynchronously */
705ececd	322
9fb754b7	323	for (i = 0; i < LINE6_ISO_PACKETS; i++)
705ececd MG	324	length += urb->iso_frame_desc[i].length;
705ececd MG	325
ad0119ab	326	spin_lock_irqsave(&line6pcm->out.lock, flags);
705ececd	327
0ca54888	328	if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
1027f476	329	struct snd_pcm_runtime *runtime = substream->runtime;
f3c5261e	330
ad0119ab	331	line6pcm->out.pos_done +=
1027f476 MG	332	length / line6pcm->properties->bytes_per_frame;
1027f476 MG	333
ad0119ab TI	334	if (line6pcm->out.pos_done >= runtime->buffer_size)
ad0119ab TI	335	line6pcm->out.pos_done -= runtime->buffer_size;
1027f476	336	}
705ececd	337
ad0119ab	338	clear_bit(index, &line6pcm->out.active_urbs);
705ececd	339
9fb754b7	340	for (i = 0; i < LINE6_ISO_PACKETS; i++)
e1a164d7	341	if (urb->iso_frame_desc[i].status == -EXDEV) {
705ececd MG	342	shutdown = 1;
	343	break;
	344	}
	345
ad0119ab	346	if (test_and_clear_bit(index, &line6pcm->out.unlink_urbs))
705ececd MG	347	shutdown = 1;
705ececd MG	348
ad0119ab	349	spin_unlock_irqrestore(&line6pcm->out.lock, flags);
705ececd	350
010f378e	351	if (!shutdown) {
1027f476	352	submit_audio_out_urb(line6pcm);
705ececd	353
6a8ec876 SH	354	if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
6a8ec876 SH	355	&line6pcm->flags)) {
ad0119ab TI	356	line6pcm->out.bytes += length;
	357	if (line6pcm->out.bytes >= line6pcm->out.period) {
	358	line6pcm->out.bytes %= line6pcm->out.period;
1027f476 MG	359	snd_pcm_period_elapsed(substream);
1027f476 MG	360	}
705ececd MG	361	}
	362	}
	363	}
	364
	365	/* open playback callback */
	366	static int snd_line6_playback_open(struct snd_pcm_substream *substream)
	367	{
	368	int err;
	369	struct snd_pcm_runtime *runtime = substream->runtime;
	370	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	371
010f378e	372	err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
e1a164d7 MG	373	(&line6pcm->
e1a164d7 MG	374	properties->snd_line6_rates));
010f378e	375	if (err < 0)
705ececd MG	376	return err;
	377
	378	runtime->hw = line6pcm->properties->snd_line6_playback_hw;
	379	return 0;
	380	}
	381
	382	/* close playback callback */
	383	static int snd_line6_playback_close(struct snd_pcm_substream *substream)
	384	{
	385	return 0;
	386	}
	387
	388	/* hw_params playback callback */
45af4977 SB	389	static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
45af4977 SB	390	struct snd_pcm_hw_params *hw_params)
705ececd MG	391	{
	392	int ret;
	393	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	394
0ca54888	395	ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
140e28b8	396
0ca54888 MG	397	if (ret < 0)
0ca54888 MG	398	return ret;
140e28b8	399
010f378e GKH	400	ret = snd_pcm_lib_malloc_pages(substream,
010f378e GKH	401	params_buffer_bytes(hw_params));
0ca54888 MG	402	if (ret < 0) {
0ca54888 MG	403	line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
705ececd	404	return ret;
0ca54888	405	}
705ececd	406
ad0119ab	407	line6pcm->out.period = params_period_bytes(hw_params);
705ececd MG	408	return 0;
	409	}
	410
	411	/* hw_free playback callback */
	412	static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
	413	{
140e28b8	414	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
f3c5261e	415
0ca54888	416	line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
705ececd MG	417	return snd_pcm_lib_free_pages(substream);
	418	}
	419
	420	/* trigger playback callback */
1027f476	421	int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
705ececd	422	{
705ececd	423	int err;
705ececd	424
010f378e	425	switch (cmd) {
705ececd	426	case SNDRV_PCM_TRIGGER_START:
1027f476	427	case SNDRV_PCM_TRIGGER_RESUME:
6a8ec876 SH	428	err = line6_pcm_acquire(line6pcm,
6a8ec876 SH	429	LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
705ececd	430
1027f476 MG	431	if (err < 0)
1027f476 MG	432	return err;
705ececd MG	433
	434	break;
	435
	436	case SNDRV_PCM_TRIGGER_STOP:
1027f476	437	case SNDRV_PCM_TRIGGER_SUSPEND:
6a8ec876 SH	438	err = line6_pcm_release(line6pcm,
6a8ec876 SH	439	LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
1027f476 MG	440
	441	if (err < 0)
	442	return err;
705ececd MG	443
	444	break;
	445
	446	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
0ca54888	447	set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
705ececd MG	448	break;
	449
	450	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
0ca54888	451	clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
705ececd MG	452	break;
	453
	454	default:
	455	return -EINVAL;
	456	}
	457
	458	return 0;
	459	}
	460
	461	/* playback pointer callback */
	462	static snd_pcm_uframes_t
	463	snd_line6_playback_pointer(struct snd_pcm_substream *substream)
	464	{
	465	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
f3c5261e	466
ad0119ab	467	return line6pcm->out.pos_done;
705ececd MG	468	}
	469
	470	/* playback operators */
	471	struct snd_pcm_ops snd_line6_playback_ops = {
e1a164d7 MG	472	.open = snd_line6_playback_open,
	473	.close = snd_line6_playback_close,
	474	.ioctl = snd_pcm_lib_ioctl,
	475	.hw_params = snd_line6_playback_hw_params,
	476	.hw_free = snd_line6_playback_hw_free,
	477	.prepare = snd_line6_prepare,
	478	.trigger = snd_line6_trigger,
	479	.pointer = snd_line6_playback_pointer,
705ececd MG	480	};
705ececd MG	481
1027f476	482	int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
705ececd	483	{
16d603d3	484	struct usb_line6 *line6 = line6pcm->line6;
705ececd MG	485	int i;
	486
	487	/* create audio URBs and fill in constant values: */
010f378e	488	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
705ececd MG	489	struct urb *urb;
	490
	491	/* URB for audio out: */
ad0119ab	492	urb = line6pcm->out.urbs[i] =
45af4977	493	usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
705ececd	494
a019f5e8	495	if (urb == NULL)
705ececd	496	return -ENOMEM;
705ececd	497
16d603d3	498	urb->dev = line6->usbdev;
45af4977	499	urb->pipe =
16d603d3 CR	500	usb_sndisocpipe(line6->usbdev,
16d603d3 CR	501	line6->properties->ep_audio_w &
e1a164d7	502	USB_ENDPOINT_NUMBER_MASK);
705ececd MG	503	urb->transfer_flags = URB_ISO_ASAP;
	504	urb->start_frame = -1;
	505	urb->number_of_packets = LINE6_ISO_PACKETS;
	506	urb->interval = LINE6_ISO_INTERVAL;
	507	urb->error_count = 0;
	508	urb->complete = audio_out_callback;
	509	}
	510
	511	return 0;
	512	}