[linux-2.6-block.git] / drivers / staging / line6 / capture.c

/*
 * 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 <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"

/*
	Find a free URB and submit it.
*/
static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
{
	int index;
	unsigned long flags;
	int i, urb_size;
	int ret;
	struct urb *urb_in;

	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
	index =
	    find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);

	if (index < 0 || index >= LINE6_ISO_BUFFERS) {
		spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
		dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
		return -EINVAL;
	}

	urb_in = line6pcm->urb_audio_in[index];
	urb_size = 0;

	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
		struct usb_iso_packet_descriptor *fin =
		    &urb_in->iso_frame_desc[i];
		fin->offset = urb_size;
		fin->length = line6pcm->max_packet_size;
		urb_size += line6pcm->max_packet_size;
	}

	urb_in->transfer_buffer =
	    line6pcm->buffer_in +
	    index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
	urb_in->transfer_buffer_length = urb_size;
	urb_in->context = line6pcm;

	ret = usb_submit_urb(urb_in, GFP_ATOMIC);

	if (ret == 0)
		set_bit(index, &line6pcm->active_urb_in);
	else
		dev_err(line6pcm->line6->ifcdev,
			"URB in #%d submission failed (%d)\n", index, ret);

	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
	return 0;
}

/*
	Submit all currently available capture URBs.
*/
int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
{
	int ret, i;

	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
		ret = submit_audio_in_urb(line6pcm);
		if (ret < 0)
			return ret;
	}

	return 0;
}

/*
	Unlink all currently active capture URBs.
*/
void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
{
	unsigned int i;

	for (i = LINE6_ISO_BUFFERS; i--;) {
		if (test_bit(i, &line6pcm->active_urb_in)) {
			if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
				struct urb *u = line6pcm->urb_audio_in[i];
				usb_unlink_urb(u);
			}
		}
	}
}

/*
	Wait until unlinking of all currently active capture URBs has been
	finished.
*/
static void wait_clear_audio_in_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_in))
				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 capture URBs, and wait for finishing.
*/
void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
{
	line6_unlink_audio_in_urbs(line6pcm);
	wait_clear_audio_in_urbs(line6pcm);
}

/*
	Copy data into ALSA capture buffer.
*/
void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
{
	struct snd_pcm_substream *substream =
	    get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
	struct snd_pcm_runtime *runtime = substream->runtime;
	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
	int frames = fsize / bytes_per_frame;

	if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
		/*
		   The transferred area goes over buffer boundary,
		   copy two separate chunks.
		 */
		int len;
		len = runtime->buffer_size - line6pcm->pos_in_done;

		if (len > 0) {
			memcpy(runtime->dma_area +
			       line6pcm->pos_in_done * bytes_per_frame, fbuf,
			       len * bytes_per_frame);
			memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
			       (frames - len) * bytes_per_frame);
		} else
			dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n", len);	/* this is somewhat paranoid */
	} else {
		/* copy single chunk */
		memcpy(runtime->dma_area +
		       line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
	}

	if ((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
		line6pcm->pos_in_done -= runtime->buffer_size;
}

void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
{
	struct snd_pcm_substream *substream =
	    get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);

	if ((line6pcm->bytes_in += length) >= line6pcm->period_in) {
		line6pcm->bytes_in %= line6pcm->period_in;
		snd_pcm_period_elapsed(substream);
	}
}

/*
  Callback for completed capture URB.
*/
static void audio_in_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;

	line6pcm->last_frame_in = urb->start_frame;

	/* find index of URB */
	for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
		if (urb == line6pcm->urb_audio_in[index])
			break;

#ifdef CONFIG_LINE6_USB_DUMP_PCM
	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
		struct usb_iso_packet_descriptor *fout =
		    &urb->iso_frame_desc[i];
		line6_write_hexdump(line6pcm->line6, 'C',
				    urb->transfer_buffer + fout->offset,
				    fout->length);
	}
#endif

	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);

	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
		char *fbuf;
		int fsize;
		struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];

		if (fin->status == -EXDEV) {
			shutdown = 1;
			break;
		}

		fbuf = urb->transfer_buffer + fin->offset;
		fsize = fin->actual_length;

		if (fsize > line6pcm->max_packet_size) {
			dev_err(line6pcm->line6->ifcdev,
				"driver and/or device bug: packet too large (%d > %d)\n",
				fsize, line6pcm->max_packet_size);
		}

		length += fsize;

		/* the following assumes LINE6_ISO_PACKETS == 1: */
#if LINE6_BACKUP_MONITOR_SIGNAL
		memcpy(line6pcm->prev_fbuf, fbuf, fsize);
#else
		line6pcm->prev_fbuf = fbuf;
#endif
		line6pcm->prev_fsize = fsize;

#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
		if (!(line6pcm->flags & MASK_PCM_IMPULSE))
#endif
			if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags)
			    && (fsize > 0))
				line6_capture_copy(line6pcm, fbuf, fsize);
	}

	clear_bit(index, &line6pcm->active_urb_in);

	if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
		shutdown = 1;

	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);

	if (!shutdown) {
		submit_audio_in_urb(line6pcm);

#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
		if (!(line6pcm->flags & MASK_PCM_IMPULSE))
#endif
			if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags))
				line6_capture_check_period(line6pcm, length);
	}
}

/* open capture callback */
static int snd_line6_capture_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_capture_hw;
	return 0;
}

/* close capture callback */
static int snd_line6_capture_close(struct snd_pcm_substream *substream)
{
	return 0;
}

/* hw_params capture callback */
static int snd_line6_capture_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 = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (ret < 0)
		return ret;

	line6pcm->period_in = params_period_bytes(hw_params);
	return 0;
}

/* hw_free capture callback */
static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

/* trigger callback */
int snd_line6_capture_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_start(line6pcm, MASK_PCM_ALSA_CAPTURE);

		if (err < 0)
			return err;

		break;

	case SNDRV_PCM_TRIGGER_STOP:
#ifdef CONFIG_PM
	case SNDRV_PCM_TRIGGER_SUSPEND:
#endif
		err = line6_pcm_stop(line6pcm, MASK_PCM_ALSA_CAPTURE);

		if (err < 0)
			return err;

		break;

	default:
		return -EINVAL;
	}

	return 0;
}

/* capture pointer callback */
static snd_pcm_uframes_t
snd_line6_capture_pointer(struct snd_pcm_substream *substream)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	return line6pcm->pos_in_done;
}

/* capture operators */
struct snd_pcm_ops snd_line6_capture_ops = {
	.open = snd_line6_capture_open,
	.close = snd_line6_capture_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_line6_capture_hw_params,
	.hw_free = snd_line6_capture_hw_free,
	.prepare = snd_line6_prepare,
	.trigger = snd_line6_trigger,
	.pointer = snd_line6_capture_pointer,
};

int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
{
	int i;

	/* create audio URBs and fill in constant values: */
	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
		struct urb *urb;

		/* URB for audio in: */
		urb = line6pcm->urb_audio_in[i] =
		    usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);

		if (urb == NULL) {
			dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
			return -ENOMEM;
		}

		urb->dev = line6pcm->line6->usbdev;
		urb->pipe =
		    usb_rcvisocpipe(line6pcm->line6->usbdev,
				    line6pcm->ep_audio_read &
				    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_in_callback;
	}

	return 0;
}
Commit	Line	Data
705ececd	1	/*
e1a164d7	2	* Line6 Linux USB driver - 0.9.1beta
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
705ececd MG	12	#include <sound/core.h>
	13	#include <sound/pcm.h>
	14	#include <sound/pcm_params.h>
	15
	16	#include "audio.h"
1027f476 MG	17	#include "capture.h"
1027f476 MG	18	#include "driver.h"
705ececd MG	19	#include "pcm.h"
705ececd MG	20	#include "pod.h"
1027f476	21
705ececd MG	22	/*
	23	Find a free URB and submit it.
	24	*/
1027f476	25	static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
705ececd	26	{
1027f476	27	int index;
705ececd	28	unsigned long flags;
705ececd	29	int i, urb_size;
e1a164d7	30	int ret;
705ececd MG	31	struct urb *urb_in;
	32
	33	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
e0645d63 SB	34	index =
e0645d63 SB	35	find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
705ececd	36
1027f476	37	if (index < 0 \|\| index >= LINE6_ISO_BUFFERS) {
705ececd	38	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
1027f476	39	dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
705ececd MG	40	return -EINVAL;
	41	}
	42
	43	urb_in = line6pcm->urb_audio_in[index];
	44	urb_size = 0;
	45
6efc5667	46	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
e0645d63 SB	47	struct usb_iso_packet_descriptor *fin =
e0645d63 SB	48	&urb_in->iso_frame_desc[i];
705ececd MG	49	fin->offset = urb_size;
	50	fin->length = line6pcm->max_packet_size;
	51	urb_size += line6pcm->max_packet_size;
	52	}
	53
e0645d63 SB	54	urb_in->transfer_buffer =
	55	line6pcm->buffer_in +
	56	index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
705ececd	57	urb_in->transfer_buffer_length = urb_size;
1027f476	58	urb_in->context = line6pcm;
705ececd	59
e1a164d7 MG	60	ret = usb_submit_urb(urb_in, GFP_ATOMIC);
	61
	62	if (ret == 0)
705ececd MG	63	set_bit(index, &line6pcm->active_urb_in);
705ececd MG	64	else
1027f476	65	dev_err(line6pcm->line6->ifcdev,
e1a164d7	66	"URB in #%d submission failed (%d)\n", index, ret);
705ececd MG	67
	68	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
	69	return 0;
	70	}
	71
	72	/*
	73	Submit all currently available capture URBs.
	74	*/
1027f476	75	int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
705ececd MG	76	{
	77	int ret, i;
	78
6efc5667	79	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
1027f476	80	ret = submit_audio_in_urb(line6pcm);
6efc5667	81	if (ret < 0)
705ececd	82	return ret;
6efc5667	83	}
705ececd MG	84
	85	return 0;
	86	}
	87
	88	/*
	89	Unlink all currently active capture URBs.
	90	*/
1027f476	91	void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
705ececd MG	92	{
	93	unsigned int i;
	94
6efc5667 GKH	95	for (i = LINE6_ISO_BUFFERS; i--;) {
	96	if (test_bit(i, &line6pcm->active_urb_in)) {
	97	if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
705ececd	98	struct urb *u = line6pcm->urb_audio_in[i];
705ececd MG	99	usb_unlink_urb(u);
	100	}
	101	}
	102	}
	103	}
	104
	105	/*
6efc5667 GKH	106	Wait until unlinking of all currently active capture URBs has been
6efc5667 GKH	107	finished.
705ececd MG	108	*/
	109	static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
	110	{
	111	int timeout = HZ;
	112	unsigned int i;
	113	int alive;
	114
	115	do {
	116	alive = 0;
	117	for (i = LINE6_ISO_BUFFERS; i--;) {
	118	if (test_bit(i, &line6pcm->active_urb_in))
	119	alive++;
	120	}
6efc5667	121	if (!alive)
705ececd MG	122	break;
	123	set_current_state(TASK_UNINTERRUPTIBLE);
	124	schedule_timeout(1);
	125	} while (--timeout > 0);
	126	if (alive)
	127	snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
705ececd MG	128	}
	129
	130	/*
	131	Unlink all currently active capture URBs, and wait for finishing.
	132	*/
1027f476	133	void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
705ececd	134	{
1027f476	135	line6_unlink_audio_in_urbs(line6pcm);
705ececd MG	136	wait_clear_audio_in_urbs(line6pcm);
	137	}
	138
	139	/*
1027f476 MG	140	Copy data into ALSA capture buffer.
	141	*/
	142	void line6_capture_copy(struct snd_line6_pcm line6pcm, char fbuf, int fsize)
	143	{
	144	struct snd_pcm_substream *substream =
	145	get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
	146	struct snd_pcm_runtime *runtime = substream->runtime;
	147	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
	148	int frames = fsize / bytes_per_frame;
	149
	150	if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
	151	/*
e1a164d7 MG	152	The transferred area goes over buffer boundary,
	153	copy two separate chunks.
	154	*/
1027f476 MG	155	int len;
	156	len = runtime->buffer_size - line6pcm->pos_in_done;
	157
	158	if (len > 0) {
	159	memcpy(runtime->dma_area +
	160	line6pcm->pos_in_done * bytes_per_frame, fbuf,
	161	len * bytes_per_frame);
	162	memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
	163	(frames - len) * bytes_per_frame);
	164	} else
	165	dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n", len); /* this is somewhat paranoid */
	166	} else {
	167	/* copy single chunk */
	168	memcpy(runtime->dma_area +
	169	line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
	170	}
	171
	172	if ((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
	173	line6pcm->pos_in_done -= runtime->buffer_size;
	174	}
	175
	176	void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
	177	{
	178	struct snd_pcm_substream *substream =
	179	get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
	180
	181	if ((line6pcm->bytes_in += length) >= line6pcm->period_in) {
	182	line6pcm->bytes_in %= line6pcm->period_in;
	183	snd_pcm_period_elapsed(substream);
	184	}
	185	}
	186
	187	/*
	188	Callback for completed capture URB.
705ececd	189	*/
0c7ab158	190	static void audio_in_callback(struct urb *urb)
705ececd MG	191	{
705ececd MG	192	int i, index, length = 0, shutdown = 0;
705ececd MG	193	unsigned long flags;
705ececd MG	194
1027f476 MG	195	struct snd_line6_pcm line6pcm = (struct snd_line6_pcm )urb->context;
	196
	197	line6pcm->last_frame_in = urb->start_frame;
705ececd MG	198
705ececd MG	199	/* find index of URB */
6efc5667 GKH	200	for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
6efc5667 GKH	201	if (urb == line6pcm->urb_audio_in[index])
705ececd MG	202	break;
705ececd MG	203
1027f476	204	#ifdef CONFIG_LINE6_USB_DUMP_PCM
6efc5667	205	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
e0645d63 SB	206	struct usb_iso_packet_descriptor *fout =
	207	&urb->iso_frame_desc[i];
	208	line6_write_hexdump(line6pcm->line6, 'C',
	209	urb->transfer_buffer + fout->offset,
	210	fout->length);
705ececd MG	211	}
	212	#endif
	213
	214	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
	215
6efc5667	216	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
705ececd MG	217	char *fbuf;
	218	int fsize;
	219	struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
	220
e1a164d7	221	if (fin->status == -EXDEV) {
705ececd MG	222	shutdown = 1;
	223	break;
	224	}
	225
	226	fbuf = urb->transfer_buffer + fin->offset;
	227	fsize = fin->actual_length;
1027f476 MG	228
	229	if (fsize > line6pcm->max_packet_size) {
	230	dev_err(line6pcm->line6->ifcdev,
	231	"driver and/or device bug: packet too large (%d > %d)\n",
	232	fsize, line6pcm->max_packet_size);
	233	}
	234
705ececd MG	235	length += fsize;
705ececd MG	236
1027f476 MG	237	/* the following assumes LINE6_ISO_PACKETS == 1: */
	238	#if LINE6_BACKUP_MONITOR_SIGNAL
	239	memcpy(line6pcm->prev_fbuf, fbuf, fsize);
	240	#else
	241	line6pcm->prev_fbuf = fbuf;
	242	#endif
	243	line6pcm->prev_fsize = fsize;
705ececd	244
1027f476 MG	245	#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
	246	if (!(line6pcm->flags & MASK_PCM_IMPULSE))
	247	#endif
	248	if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags)
	249	&& (fsize > 0))
	250	line6_capture_copy(line6pcm, fbuf, fsize);
705ececd MG	251	}
	252
	253	clear_bit(index, &line6pcm->active_urb_in);
	254
1027f476	255	if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
705ececd MG	256	shutdown = 1;
	257
	258	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
	259
6efc5667	260	if (!shutdown) {
1027f476	261	submit_audio_in_urb(line6pcm);
705ececd	262
e1a164d7 MG	263	#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
	264	if (!(line6pcm->flags & MASK_PCM_IMPULSE))
	265	#endif
	266	if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags))
	267	line6_capture_check_period(line6pcm, length);
705ececd MG	268	}
	269	}
	270
	271	/* open capture callback */
	272	static int snd_line6_capture_open(struct snd_pcm_substream *substream)
	273	{
	274	int err;
	275	struct snd_pcm_runtime *runtime = substream->runtime;
	276	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	277
6efc5667 GKH	278	err = snd_pcm_hw_constraint_ratdens(runtime, 0,
6efc5667 GKH	279	SNDRV_PCM_HW_PARAM_RATE,
e1a164d7 MG	280	(&line6pcm->
e1a164d7 MG	281	properties->snd_line6_rates));
6efc5667	282	if (err < 0)
705ececd MG	283	return err;
	284
	285	runtime->hw = line6pcm->properties->snd_line6_capture_hw;
	286	return 0;
	287	}
	288
	289	/* close capture callback */
	290	static int snd_line6_capture_close(struct snd_pcm_substream *substream)
	291	{
	292	return 0;
	293	}
	294
	295	/* hw_params capture callback */
6efc5667 GKH	296	static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
6efc5667 GKH	297	struct snd_pcm_hw_params *hw_params)
705ececd MG	298	{
	299	int ret;
	300	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	301
	302	/* -- Florian Demski [FD] */
	303	/* don't ask me why, but this fixes the bug on my machine */
6efc5667 GKH	304	if (line6pcm == NULL) {
6efc5667 GKH	305	if (substream->pcm == NULL)
705ececd	306	return -ENOMEM;
6efc5667	307	if (substream->pcm->private_data == NULL)
705ececd MG	308	return -ENOMEM;
705ececd MG	309	substream->private_data = substream->pcm->private_data;
6efc5667	310	line6pcm = snd_pcm_substream_chip(substream);
705ececd MG	311	}
	312	/* -- [FD] end */
	313
6efc5667 GKH	314	ret = snd_pcm_lib_malloc_pages(substream,
	315	params_buffer_bytes(hw_params));
	316	if (ret < 0)
705ececd MG	317	return ret;
	318
	319	line6pcm->period_in = params_period_bytes(hw_params);
705ececd MG	320	return 0;
	321	}
	322
	323	/* hw_free capture callback */
	324	static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
	325	{
705ececd MG	326	return snd_pcm_lib_free_pages(substream);
	327	}
	328
	329	/* trigger callback */
1027f476	330	int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
705ececd	331	{
705ececd	332	int err;
705ececd	333
6efc5667	334	switch (cmd) {
705ececd	335	case SNDRV_PCM_TRIGGER_START:
1027f476 MG	336	#ifdef CONFIG_PM
	337	case SNDRV_PCM_TRIGGER_RESUME:
	338	#endif
	339	err = line6_pcm_start(line6pcm, MASK_PCM_ALSA_CAPTURE);
705ececd	340
1027f476 MG	341	if (err < 0)
1027f476 MG	342	return err;
705ececd MG	343
	344	break;
	345
	346	case SNDRV_PCM_TRIGGER_STOP:
1027f476 MG	347	#ifdef CONFIG_PM
	348	case SNDRV_PCM_TRIGGER_SUSPEND:
	349	#endif
	350	err = line6_pcm_stop(line6pcm, MASK_PCM_ALSA_CAPTURE);
	351
	352	if (err < 0)
	353	return err;
705ececd MG	354
	355	break;
	356
	357	default:
	358	return -EINVAL;
	359	}
	360
	361	return 0;
	362	}
	363
	364	/* capture pointer callback */
	365	static snd_pcm_uframes_t
	366	snd_line6_capture_pointer(struct snd_pcm_substream *substream)
	367	{
	368	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	369	return line6pcm->pos_in_done;
	370	}
	371
	372	/* capture operators */
	373	struct snd_pcm_ops snd_line6_capture_ops = {
e1a164d7 MG	374	.open = snd_line6_capture_open,
	375	.close = snd_line6_capture_close,
	376	.ioctl = snd_pcm_lib_ioctl,
	377	.hw_params = snd_line6_capture_hw_params,
	378	.hw_free = snd_line6_capture_hw_free,
	379	.prepare = snd_line6_prepare,
	380	.trigger = snd_line6_trigger,
	381	.pointer = snd_line6_capture_pointer,
705ececd MG	382	};
705ececd MG	383
1027f476	384	int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
705ececd MG	385	{
	386	int i;
	387
	388	/* create audio URBs and fill in constant values: */
6efc5667	389	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
705ececd MG	390	struct urb *urb;
	391
	392	/* URB for audio in: */
e0645d63 SB	393	urb = line6pcm->urb_audio_in[i] =
e0645d63 SB	394	usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
705ececd	395
6efc5667	396	if (urb == NULL) {
705ececd MG	397	dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
	398	return -ENOMEM;
	399	}
	400
	401	urb->dev = line6pcm->line6->usbdev;
e0645d63 SB	402	urb->pipe =
e0645d63 SB	403	usb_rcvisocpipe(line6pcm->line6->usbdev,
e1a164d7 MG	404	line6pcm->ep_audio_read &
e1a164d7 MG	405	USB_ENDPOINT_NUMBER_MASK);
705ececd MG	406	urb->transfer_flags = URB_ISO_ASAP;
	407	urb->start_frame = -1;
	408	urb->number_of_packets = LINE6_ISO_PACKETS;
	409	urb->interval = LINE6_ISO_INTERVAL;
	410	urb->error_count = 0;
	411	urb->complete = audio_in_callback;
	412	}
	413
	414	return 0;
	415	}