[deliverable/linux.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 <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "audio.h"
#include "capture.h"
#include "driver.h"
#include "pcm.h"
#include "pod.h"

/*
	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.
*/
void line6_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);
	line6_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 (runtime == NULL)
		return;

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

	line6pcm->pos_in_done += frames;
	if (line6pcm->pos_in_done >= 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);

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

void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
{
	kfree(line6pcm->buffer_in);
	line6pcm->buffer_in = NULL;
}

/*
 * 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: */
		line6pcm->prev_fbuf = fbuf;
		line6pcm->prev_fsize = fsize;

#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
		if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
#endif
			if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
				     &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 & LINE6_BITS_PCM_IMPULSE))
#endif
			if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
				     &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 = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_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_CAPTURE_BUFFER);
		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)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
	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_acquire(line6pcm,
					LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);

		if (err < 0)
			return err;

		break;

	case SNDRV_PCM_TRIGGER_STOP:
#ifdef CONFIG_PM
	case SNDRV_PCM_TRIGGER_SUSPEND:
#endif
		err = line6_pcm_release(line6pcm,
					LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);

		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
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
	17	#include "audio.h"
1027f476 MG	18	#include "capture.h"
1027f476 MG	19	#include "driver.h"
705ececd MG	20	#include "pcm.h"
705ececd MG	21	#include "pod.h"
1027f476	22
705ececd MG	23	/*
	24	Find a free URB and submit it.
	25	*/
1027f476	26	static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
705ececd	27	{
1027f476	28	int index;
705ececd	29	unsigned long flags;
705ececd	30	int i, urb_size;
e1a164d7	31	int ret;
705ececd MG	32	struct urb *urb_in;
	33
	34	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
e0645d63 SB	35	index =
e0645d63 SB	36	find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
705ececd	37
1027f476	38	if (index < 0 \|\| index >= LINE6_ISO_BUFFERS) {
705ececd	39	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
1027f476	40	dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
705ececd MG	41	return -EINVAL;
	42	}
	43
	44	urb_in = line6pcm->urb_audio_in[index];
	45	urb_size = 0;
	46
6efc5667	47	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
e0645d63 SB	48	struct usb_iso_packet_descriptor *fin =
e0645d63 SB	49	&urb_in->iso_frame_desc[i];
705ececd MG	50	fin->offset = urb_size;
	51	fin->length = line6pcm->max_packet_size;
	52	urb_size += line6pcm->max_packet_size;
	53	}
	54
e0645d63 SB	55	urb_in->transfer_buffer =
	56	line6pcm->buffer_in +
	57	index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
705ececd	58	urb_in->transfer_buffer_length = urb_size;
1027f476	59	urb_in->context = line6pcm;
705ececd	60
e1a164d7 MG	61	ret = usb_submit_urb(urb_in, GFP_ATOMIC);
	62
	63	if (ret == 0)
705ececd MG	64	set_bit(index, &line6pcm->active_urb_in);
705ececd MG	65	else
1027f476	66	dev_err(line6pcm->line6->ifcdev,
e1a164d7	67	"URB in #%d submission failed (%d)\n", index, ret);
705ececd MG	68
	69	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
	70	return 0;
	71	}
	72
	73	/*
	74	Submit all currently available capture URBs.
	75	*/
1027f476	76	int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
705ececd MG	77	{
	78	int ret, i;
	79
6efc5667	80	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
1027f476	81	ret = submit_audio_in_urb(line6pcm);
6efc5667	82	if (ret < 0)
705ececd	83	return ret;
6efc5667	84	}
705ececd MG	85
	86	return 0;
	87	}
	88
	89	/*
	90	Unlink all currently active capture URBs.
	91	*/
1027f476	92	void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
705ececd MG	93	{
	94	unsigned int i;
	95
6efc5667 GKH	96	for (i = LINE6_ISO_BUFFERS; i--;) {
	97	if (test_bit(i, &line6pcm->active_urb_in)) {
	98	if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
705ececd	99	struct urb *u = line6pcm->urb_audio_in[i];
705ececd MG	100	usb_unlink_urb(u);
	101	}
	102	}
	103	}
	104	}
	105
	106	/*
6efc5667 GKH	107	Wait until unlinking of all currently active capture URBs has been
6efc5667 GKH	108	finished.
705ececd	109	*/
0ca54888	110	void line6_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
705ececd MG	111	{
	112	int timeout = HZ;
	113	unsigned int i;
	114	int alive;
	115
	116	do {
	117	alive = 0;
	118	for (i = LINE6_ISO_BUFFERS; i--;) {
	119	if (test_bit(i, &line6pcm->active_urb_in))
	120	alive++;
	121	}
6efc5667	122	if (!alive)
705ececd MG	123	break;
	124	set_current_state(TASK_UNINTERRUPTIBLE);
	125	schedule_timeout(1);
	126	} while (--timeout > 0);
	127	if (alive)
	128	snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
705ececd MG	129	}
	130
	131	/*
	132	Unlink all currently active capture URBs, and wait for finishing.
	133	*/
1027f476	134	void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
705ececd	135	{
1027f476	136	line6_unlink_audio_in_urbs(line6pcm);
0ca54888	137	line6_wait_clear_audio_in_urbs(line6pcm);
705ececd MG	138	}
	139
	140	/*
1027f476 MG	141	Copy data into ALSA capture buffer.
	142	*/
	143	void line6_capture_copy(struct snd_line6_pcm line6pcm, char fbuf, int fsize)
	144	{
	145	struct snd_pcm_substream *substream =
	146	get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
	147	struct snd_pcm_runtime *runtime = substream->runtime;
	148	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
	149	int frames = fsize / bytes_per_frame;
	150
597a1e7c	151	if (runtime == NULL)
c7fcf255 MG	152	return;
c7fcf255 MG	153
1027f476 MG	154	if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
1027f476 MG	155	/*
e1a164d7 MG	156	The transferred area goes over buffer boundary,
	157	copy two separate chunks.
	158	*/
1027f476 MG	159	int len;
	160	len = runtime->buffer_size - line6pcm->pos_in_done;
	161
	162	if (len > 0) {
	163	memcpy(runtime->dma_area +
	164	line6pcm->pos_in_done * bytes_per_frame, fbuf,
	165	len * bytes_per_frame);
	166	memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
	167	(frames - len) * bytes_per_frame);
027360c5 GKH	168	} else {
	169	/* this is somewhat paranoid */
	170	dev_err(line6pcm->line6->ifcdev,
	171	"driver bug: len = %d\n", len);
	172	}
1027f476 MG	173	} else {
	174	/* copy single chunk */
	175	memcpy(runtime->dma_area +
	176	line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
	177	}
	178
027360c5 GKH	179	line6pcm->pos_in_done += frames;
027360c5 GKH	180	if (line6pcm->pos_in_done >= runtime->buffer_size)
1027f476 MG	181	line6pcm->pos_in_done -= runtime->buffer_size;
	182	}
	183
	184	void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
	185	{
	186	struct snd_pcm_substream *substream =
	187	get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
	188
027360c5 GKH	189	line6pcm->bytes_in += length;
027360c5 GKH	190	if (line6pcm->bytes_in >= line6pcm->period_in) {
1027f476 MG	191	line6pcm->bytes_in %= line6pcm->period_in;
	192	snd_pcm_period_elapsed(substream);
	193	}
	194	}
	195
6b02a17e MG	196	void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
	197	{
	198	kfree(line6pcm->buffer_in);
	199	line6pcm->buffer_in = NULL;
	200	}
	201
1027f476	202	/*
027360c5 GKH	203	* Callback for completed capture URB.
027360c5 GKH	204	*/
0c7ab158	205	static void audio_in_callback(struct urb *urb)
705ececd MG	206	{
705ececd MG	207	int i, index, length = 0, shutdown = 0;
705ececd MG	208	unsigned long flags;
705ececd MG	209
1027f476 MG	210	struct snd_line6_pcm line6pcm = (struct snd_line6_pcm )urb->context;
	211
	212	line6pcm->last_frame_in = urb->start_frame;
705ececd MG	213
705ececd MG	214	/* find index of URB */
6efc5667 GKH	215	for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
6efc5667 GKH	216	if (urb == line6pcm->urb_audio_in[index])
705ececd MG	217	break;
705ececd MG	218
1027f476	219	#ifdef CONFIG_LINE6_USB_DUMP_PCM
6efc5667	220	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
e0645d63 SB	221	struct usb_iso_packet_descriptor *fout =
	222	&urb->iso_frame_desc[i];
	223	line6_write_hexdump(line6pcm->line6, 'C',
	224	urb->transfer_buffer + fout->offset,
	225	fout->length);
705ececd MG	226	}
	227	#endif
	228
	229	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
	230
6efc5667	231	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
705ececd MG	232	char *fbuf;
	233	int fsize;
	234	struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
	235
e1a164d7	236	if (fin->status == -EXDEV) {
705ececd MG	237	shutdown = 1;
	238	break;
	239	}
	240
	241	fbuf = urb->transfer_buffer + fin->offset;
	242	fsize = fin->actual_length;
1027f476 MG	243
	244	if (fsize > line6pcm->max_packet_size) {
	245	dev_err(line6pcm->line6->ifcdev,
	246	"driver and/or device bug: packet too large (%d > %d)\n",
	247	fsize, line6pcm->max_packet_size);
	248	}
	249
705ececd MG	250	length += fsize;
705ececd MG	251
1027f476	252	/* the following assumes LINE6_ISO_PACKETS == 1: */
1027f476	253	line6pcm->prev_fbuf = fbuf;
1027f476	254	line6pcm->prev_fsize = fsize;
705ececd	255
1027f476	256	#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
0ca54888	257	if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
1027f476	258	#endif
a71cac2a SH	259	if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
a71cac2a SH	260	&line6pcm->flags) && (fsize > 0))
1027f476	261	line6_capture_copy(line6pcm, fbuf, fsize);
705ececd MG	262	}
	263
	264	clear_bit(index, &line6pcm->active_urb_in);
	265
1027f476	266	if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
705ececd MG	267	shutdown = 1;
	268
	269	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
	270
6efc5667	271	if (!shutdown) {
1027f476	272	submit_audio_in_urb(line6pcm);
705ececd	273
e1a164d7	274	#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
0ca54888	275	if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
e1a164d7	276	#endif
a71cac2a SH	277	if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
a71cac2a SH	278	&line6pcm->flags))
e1a164d7	279	line6_capture_check_period(line6pcm, length);
705ececd MG	280	}
	281	}
	282
	283	/* open capture callback */
	284	static int snd_line6_capture_open(struct snd_pcm_substream *substream)
	285	{
	286	int err;
	287	struct snd_pcm_runtime *runtime = substream->runtime;
	288	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	289
6efc5667 GKH	290	err = snd_pcm_hw_constraint_ratdens(runtime, 0,
6efc5667 GKH	291	SNDRV_PCM_HW_PARAM_RATE,
e1a164d7 MG	292	(&line6pcm->
e1a164d7 MG	293	properties->snd_line6_rates));
6efc5667	294	if (err < 0)
705ececd MG	295	return err;
	296
	297	runtime->hw = line6pcm->properties->snd_line6_capture_hw;
	298	return 0;
	299	}
	300
	301	/* close capture callback */
	302	static int snd_line6_capture_close(struct snd_pcm_substream *substream)
	303	{
	304	return 0;
	305	}
	306
	307	/* hw_params capture callback */
6efc5667 GKH	308	static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
6efc5667 GKH	309	struct snd_pcm_hw_params *hw_params)
705ececd MG	310	{
	311	int ret;
	312	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	313
	314	/* -- Florian Demski [FD] */
	315	/* don't ask me why, but this fixes the bug on my machine */
6efc5667 GKH	316	if (line6pcm == NULL) {
6efc5667 GKH	317	if (substream->pcm == NULL)
705ececd	318	return -ENOMEM;
6efc5667	319	if (substream->pcm->private_data == NULL)
705ececd MG	320	return -ENOMEM;
705ececd MG	321	substream->private_data = substream->pcm->private_data;
6efc5667	322	line6pcm = snd_pcm_substream_chip(substream);
705ececd MG	323	}
	324	/* -- [FD] end */
	325
0ca54888	326	ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
140e28b8	327
0ca54888 MG	328	if (ret < 0)
0ca54888 MG	329	return ret;
140e28b8	330
6efc5667 GKH	331	ret = snd_pcm_lib_malloc_pages(substream,
6efc5667 GKH	332	params_buffer_bytes(hw_params));
0ca54888 MG	333	if (ret < 0) {
0ca54888 MG	334	line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
705ececd	335	return ret;
0ca54888	336	}
705ececd MG	337
705ececd MG	338	line6pcm->period_in = params_period_bytes(hw_params);
705ececd MG	339	return 0;
	340	}
	341
	342	/* hw_free capture callback */
	343	static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
	344	{
140e28b8	345	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
0ca54888	346	line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
705ececd MG	347	return snd_pcm_lib_free_pages(substream);
	348	}
	349
	350	/* trigger callback */
1027f476	351	int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
705ececd	352	{
705ececd	353	int err;
705ececd	354
6efc5667	355	switch (cmd) {
705ececd	356	case SNDRV_PCM_TRIGGER_START:
1027f476 MG	357	#ifdef CONFIG_PM
	358	case SNDRV_PCM_TRIGGER_RESUME:
	359	#endif
a71cac2a SH	360	err = line6_pcm_acquire(line6pcm,
a71cac2a SH	361	LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
705ececd	362
1027f476 MG	363	if (err < 0)
1027f476 MG	364	return err;
705ececd MG	365
	366	break;
	367
	368	case SNDRV_PCM_TRIGGER_STOP:
1027f476 MG	369	#ifdef CONFIG_PM
	370	case SNDRV_PCM_TRIGGER_SUSPEND:
	371	#endif
a71cac2a SH	372	err = line6_pcm_release(line6pcm,
a71cac2a SH	373	LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
1027f476 MG	374
	375	if (err < 0)
	376	return err;
705ececd MG	377
	378	break;
	379
	380	default:
	381	return -EINVAL;
	382	}
	383
	384	return 0;
	385	}
	386
	387	/* capture pointer callback */
	388	static snd_pcm_uframes_t
	389	snd_line6_capture_pointer(struct snd_pcm_substream *substream)
	390	{
	391	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	392	return line6pcm->pos_in_done;
	393	}
	394
	395	/* capture operators */
	396	struct snd_pcm_ops snd_line6_capture_ops = {
e1a164d7 MG	397	.open = snd_line6_capture_open,
	398	.close = snd_line6_capture_close,
	399	.ioctl = snd_pcm_lib_ioctl,
	400	.hw_params = snd_line6_capture_hw_params,
	401	.hw_free = snd_line6_capture_hw_free,
	402	.prepare = snd_line6_prepare,
	403	.trigger = snd_line6_trigger,
	404	.pointer = snd_line6_capture_pointer,
705ececd MG	405	};
705ececd MG	406
1027f476	407	int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
705ececd MG	408	{
	409	int i;
	410
	411	/* create audio URBs and fill in constant values: */
6efc5667	412	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
705ececd MG	413	struct urb *urb;
	414
	415	/* URB for audio in: */
e0645d63 SB	416	urb = line6pcm->urb_audio_in[i] =
e0645d63 SB	417	usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
705ececd	418
6efc5667	419	if (urb == NULL) {
705ececd MG	420	dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
	421	return -ENOMEM;
	422	}
	423
	424	urb->dev = line6pcm->line6->usbdev;
e0645d63 SB	425	urb->pipe =
e0645d63 SB	426	usb_rcvisocpipe(line6pcm->line6->usbdev,
e1a164d7 MG	427	line6pcm->ep_audio_read &
e1a164d7 MG	428	USB_ENDPOINT_NUMBER_MASK);
705ececd MG	429	urb->transfer_flags = URB_ISO_ASAP;
	430	urb->start_frame = -1;
	431	urb->number_of_packets = LINE6_ISO_PACKETS;
	432	urb->interval = LINE6_ISO_INTERVAL;
	433	urb->error_count = 0;
	434	urb->complete = audio_in_callback;
	435	}
	436
	437	return 0;
	438	}