[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / line6 / capture.c

/*
 * Line6 Linux USB driver - 0.8.0
 *
 * Copyright (C) 2004-2009 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 "driver.h"

#include <linux/slab.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

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

/*
	Find a free URB and submit it.
*/
static int submit_audio_in_urb(struct snd_pcm_substream *substream)
{
	unsigned int index;
	unsigned long flags;
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	int i, urb_size;
	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 >= LINE6_ISO_BUFFERS) {
		spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
		dev_err(s2m(substream), "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 = substream;

	if (usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
		set_bit(index, &line6pcm->active_urb_in);
	else
		dev_err(s2m(substream), "URB in #%d submission failed\n",
			index);

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

/*
	Submit all currently available capture URBs.
*/
static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
{
	int ret, i;

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

	return 0;
}

/*
	Unlink all currently active capture URBs.
*/
static void 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);

	line6pcm->active_urb_in = 0;
	line6pcm->unlink_urb_in = 0;
}

/*
	Unlink all currently active capture URBs, and wait for finishing.
*/
void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
{
	unlink_audio_in_urbs(line6pcm);
	wait_clear_audio_in_urbs(line6pcm);
}

/*
	Callback for completed capture URB.
*/
static void audio_in_callback(struct urb *urb)
{
	int i, index, length = 0, shutdown = 0;
	int frames;
	unsigned long flags;

	struct snd_pcm_substream *substream =
	    (struct snd_pcm_substream *)urb->context;
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
	struct snd_pcm_runtime *runtime = substream->runtime;

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

#if DO_DUMP_PCM_RECEIVE
	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 == -18) {
			shutdown = 1;
			break;
		}

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

		if (fsize > 0) {
			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 {
					/* this is somewhat paranoid */
					dev_err(s2m(substream),
						"driver bug: len = %d\n", len);
				}
			} else {
				/* copy single chunk */
				memcpy(runtime->dma_area +
				       line6pcm->pos_in_done * bytes_per_frame,
				       fbuf, fsize * bytes_per_frame);
			}

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

	clear_bit(index, &line6pcm->active_urb_in);

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

	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);

	if (!shutdown) {
		submit_audio_in_urb(substream);

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

/* 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);
	line6pcm->buffer_in =
	    kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
		    LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);

	if (!line6pcm->buffer_in) {
		dev_err(s2m(substream), "cannot malloc buffer_in\n");
		return -ENOMEM;
	}

	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);
	unlink_wait_clear_audio_in_urbs(line6pcm);

	kfree(line6pcm->buffer_in);
	line6pcm->buffer_in = NULL;

	return snd_pcm_lib_free_pages(substream);
}

/* trigger callback */
int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	int err;
	line6pcm->count_in = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		if (!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
			err = submit_audio_in_all_urbs(substream);

			if (err < 0) {
				clear_bit(BIT_RUNNING_CAPTURE,
					  &line6pcm->flags);
				return err;
			}
		}

		break;

	case SNDRV_PCM_TRIGGER_STOP:
		if (test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
			unlink_audio_in_urbs(line6pcm);

		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 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 MG	1	/*
	2	* Line6 Linux USB driver - 0.8.0
	3	*
	4	* Copyright (C) 2004-2009 Markus Grabner (grabner@icg.tugraz.at)
	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
	12	#include "driver.h"
	13
5a0e3ad6 TH	14	#include <linux/slab.h>
5a0e3ad6 TH	15
705ececd MG	16	#include <sound/core.h>
	17	#include <sound/pcm.h>
	18	#include <sound/pcm_params.h>
	19
	20	#include "audio.h"
	21	#include "pcm.h"
	22	#include "pod.h"
b702ed25	23	#include "capture.h"
705ececd	24
705ececd MG	25	/*
	26	Find a free URB and submit it.
	27	*/
	28	static int submit_audio_in_urb(struct snd_pcm_substream *substream)
	29	{
c2f5e9d2	30	unsigned int index;
705ececd MG	31	unsigned long flags;
	32	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	33	int i, urb_size;
	34	struct urb *urb_in;
	35
	36	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
e0645d63 SB	37	index =
e0645d63 SB	38	find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
705ececd	39
c2f5e9d2	40	if (index >= LINE6_ISO_BUFFERS) {
705ececd MG	41	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
	42	dev_err(s2m(substream), "no free URB found\n");
	43	return -EINVAL;
	44	}
	45
	46	urb_in = line6pcm->urb_audio_in[index];
	47	urb_size = 0;
	48
6efc5667	49	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
e0645d63 SB	50	struct usb_iso_packet_descriptor *fin =
e0645d63 SB	51	&urb_in->iso_frame_desc[i];
705ececd MG	52	fin->offset = urb_size;
	53	fin->length = line6pcm->max_packet_size;
	54	urb_size += line6pcm->max_packet_size;
	55	}
	56
e0645d63 SB	57	urb_in->transfer_buffer =
	58	line6pcm->buffer_in +
	59	index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
705ececd MG	60	urb_in->transfer_buffer_length = urb_size;
	61	urb_in->context = substream;
	62
6efc5667	63	if (usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
705ececd MG	64	set_bit(index, &line6pcm->active_urb_in);
705ececd MG	65	else
e0645d63 SB	66	dev_err(s2m(substream), "URB in #%d submission failed\n",
e0645d63 SB	67	index);
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	*/
	76	static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
	77	{
	78	int ret, i;
	79
6efc5667 GKH	80	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
	81	ret = submit_audio_in_urb(substream);
	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	*/
	92	static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
	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 MG	109	*/
	110	static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
	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);
	129
	130	line6pcm->active_urb_in = 0;
	131	line6pcm->unlink_urb_in = 0;
	132	}
	133
	134	/*
	135	Unlink all currently active capture URBs, and wait for finishing.
	136	*/
	137	void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
	138	{
	139	unlink_audio_in_urbs(line6pcm);
	140	wait_clear_audio_in_urbs(line6pcm);
	141	}
	142
	143	/*
	144	Callback for completed capture URB.
	145	*/
0c7ab158	146	static void audio_in_callback(struct urb *urb)
705ececd MG	147	{
	148	int i, index, length = 0, shutdown = 0;
	149	int frames;
	150	unsigned long flags;
	151
e0645d63 SB	152	struct snd_pcm_substream *substream =
e0645d63 SB	153	(struct snd_pcm_substream *)urb->context;
705ececd MG	154	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	155	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
	156	struct snd_pcm_runtime *runtime = substream->runtime;
	157
	158	/* find index of URB */
6efc5667 GKH	159	for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
6efc5667 GKH	160	if (urb == line6pcm->urb_audio_in[index])
705ececd MG	161	break;
	162
	163	#if DO_DUMP_PCM_RECEIVE
6efc5667	164	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
e0645d63 SB	165	struct usb_iso_packet_descriptor *fout =
	166	&urb->iso_frame_desc[i];
	167	line6_write_hexdump(line6pcm->line6, 'C',
	168	urb->transfer_buffer + fout->offset,
	169	fout->length);
705ececd MG	170	}
	171	#endif
	172
	173	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
	174
6efc5667	175	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
705ececd MG	176	char *fbuf;
	177	int fsize;
	178	struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
	179
6efc5667	180	if (fin->status == -18) {
705ececd MG	181	shutdown = 1;
	182	break;
	183	}
	184
	185	fbuf = urb->transfer_buffer + fin->offset;
	186	fsize = fin->actual_length;
	187	length += fsize;
	188
6efc5667	189	if (fsize > 0) {
705ececd MG	190	frames = fsize / bytes_per_frame;
705ececd MG	191
e0645d63 SB	192	if (line6pcm->pos_in_done + frames >
e0645d63 SB	193	runtime->buffer_size) {
705ececd	194	/*
e0645d63 SB	195	The transferred area goes over buffer
	196	boundary, copy two separate chunks.
	197	*/
705ececd	198	int len;
e0645d63 SB	199	len =
	200	runtime->buffer_size -
	201	line6pcm->pos_in_done;
705ececd	202
6efc5667	203	if (len > 0) {
e0645d63 SB	204	memcpy(runtime->dma_area +
	205	line6pcm->pos_in_done *
	206	bytes_per_frame, fbuf,
	207	len * bytes_per_frame);
	208	memcpy(runtime->dma_area,
	209	fbuf + len * bytes_per_frame,
	210	(frames -
	211	len) * bytes_per_frame);
	212	} else {
	213	/* this is somewhat paranoid */
	214	dev_err(s2m(substream),
	215	"driver bug: len = %d\n", len);
	216	}
6efc5667	217	} else {
705ececd	218	/* copy single chunk */
e0645d63 SB	219	memcpy(runtime->dma_area +
	220	line6pcm->pos_in_done * bytes_per_frame,
	221	fbuf, fsize * bytes_per_frame);
705ececd MG	222	}
705ececd MG	223
df30c0f0 SB	224	line6pcm->pos_in_done += frames;
df30c0f0 SB	225	if (line6pcm->pos_in_done >= runtime->buffer_size)
705ececd MG	226	line6pcm->pos_in_done -= runtime->buffer_size;
	227	}
	228	}
	229
	230	clear_bit(index, &line6pcm->active_urb_in);
	231
6efc5667	232	if (test_bit(index, &line6pcm->unlink_urb_in))
705ececd MG	233	shutdown = 1;
	234
	235	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
	236
6efc5667	237	if (!shutdown) {
705ececd MG	238	submit_audio_in_urb(substream);
705ececd MG	239
df30c0f0 SB	240	line6pcm->bytes_in += length;
df30c0f0 SB	241	if (line6pcm->bytes_in >= line6pcm->period_in) {
705ececd MG	242	line6pcm->bytes_in -= line6pcm->period_in;
	243	snd_pcm_period_elapsed(substream);
	244	}
	245	}
	246	}
	247
	248	/* open capture callback */
	249	static int snd_line6_capture_open(struct snd_pcm_substream *substream)
	250	{
	251	int err;
	252	struct snd_pcm_runtime *runtime = substream->runtime;
	253	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	254
6efc5667 GKH	255	err = snd_pcm_hw_constraint_ratdens(runtime, 0,
6efc5667 GKH	256	SNDRV_PCM_HW_PARAM_RATE,
e0645d63 SB	257	(&line6pcm->properties->
e0645d63 SB	258	snd_line6_rates));
6efc5667	259	if (err < 0)
705ececd MG	260	return err;
	261
	262	runtime->hw = line6pcm->properties->snd_line6_capture_hw;
	263	return 0;
	264	}
	265
	266	/* close capture callback */
	267	static int snd_line6_capture_close(struct snd_pcm_substream *substream)
	268	{
	269	return 0;
	270	}
	271
	272	/* hw_params capture callback */
6efc5667 GKH	273	static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
6efc5667 GKH	274	struct snd_pcm_hw_params *hw_params)
705ececd MG	275	{
	276	int ret;
	277	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	278
	279	/* -- Florian Demski [FD] */
	280	/* don't ask me why, but this fixes the bug on my machine */
6efc5667 GKH	281	if (line6pcm == NULL) {
6efc5667 GKH	282	if (substream->pcm == NULL)
705ececd	283	return -ENOMEM;
6efc5667	284	if (substream->pcm->private_data == NULL)
705ececd MG	285	return -ENOMEM;
705ececd MG	286	substream->private_data = substream->pcm->private_data;
6efc5667	287	line6pcm = snd_pcm_substream_chip(substream);
705ececd MG	288	}
	289	/* -- [FD] end */
	290
6efc5667 GKH	291	ret = snd_pcm_lib_malloc_pages(substream,
	292	params_buffer_bytes(hw_params));
	293	if (ret < 0)
705ececd MG	294	return ret;
	295
	296	line6pcm->period_in = params_period_bytes(hw_params);
e0645d63 SB	297	line6pcm->buffer_in =
	298	kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
	299	LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
705ececd	300
6efc5667	301	if (!line6pcm->buffer_in) {
705ececd MG	302	dev_err(s2m(substream), "cannot malloc buffer_in\n");
	303	return -ENOMEM;
	304	}
	305
	306	return 0;
	307	}
	308
	309	/* hw_free capture callback */
	310	static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
	311	{
	312	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	313	unlink_wait_clear_audio_in_urbs(line6pcm);
	314
6efc5667 GKH	315	kfree(line6pcm->buffer_in);
6efc5667 GKH	316	line6pcm->buffer_in = NULL;
705ececd MG	317
	318	return snd_pcm_lib_free_pages(substream);
	319	}
	320
	321	/* trigger callback */
	322	int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
	323	{
	324	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	325	int err;
	326	line6pcm->count_in = 0;
	327
6efc5667	328	switch (cmd) {
705ececd	329	case SNDRV_PCM_TRIGGER_START:
6efc5667	330	if (!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
705ececd MG	331	err = submit_audio_in_all_urbs(substream);
705ececd MG	332
6efc5667	333	if (err < 0) {
e0645d63 SB	334	clear_bit(BIT_RUNNING_CAPTURE,
e0645d63 SB	335	&line6pcm->flags);
705ececd MG	336	return err;
	337	}
	338	}
	339
	340	break;
	341
	342	case SNDRV_PCM_TRIGGER_STOP:
6efc5667	343	if (test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
705ececd MG	344	unlink_audio_in_urbs(line6pcm);
	345
	346	break;
	347
	348	default:
	349	return -EINVAL;
	350	}
	351
	352	return 0;
	353	}
	354
	355	/* capture pointer callback */
	356	static snd_pcm_uframes_t
	357	snd_line6_capture_pointer(struct snd_pcm_substream *substream)
	358	{
	359	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	360	return line6pcm->pos_in_done;
	361	}
	362
	363	/* capture operators */
	364	struct snd_pcm_ops snd_line6_capture_ops = {
e0645d63 SB	365	.open = snd_line6_capture_open,
	366	.close = snd_line6_capture_close,
	367	.ioctl = snd_pcm_lib_ioctl,
	368	.hw_params = snd_line6_capture_hw_params,
	369	.hw_free = snd_line6_capture_hw_free,
	370	.prepare = snd_line6_prepare,
	371	.trigger = snd_line6_trigger,
	372	.pointer = snd_line6_capture_pointer,
705ececd MG	373	};
	374
	375	int create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
	376	{
	377	int i;
	378
	379	/* create audio URBs and fill in constant values: */
6efc5667	380	for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
705ececd MG	381	struct urb *urb;
	382
	383	/* URB for audio in: */
e0645d63 SB	384	urb = line6pcm->urb_audio_in[i] =
e0645d63 SB	385	usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
705ececd	386
6efc5667	387	if (urb == NULL) {
705ececd MG	388	dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
	389	return -ENOMEM;
	390	}
	391
	392	urb->dev = line6pcm->line6->usbdev;
e0645d63 SB	393	urb->pipe =
	394	usb_rcvisocpipe(line6pcm->line6->usbdev,
	395	line6pcm->
	396	ep_audio_read & USB_ENDPOINT_NUMBER_MASK);
705ececd MG	397	urb->transfer_flags = URB_ISO_ASAP;
	398	urb->start_frame = -1;
	399	urb->number_of_packets = LINE6_ISO_PACKETS;
	400	urb->interval = LINE6_ISO_INTERVAL;
	401	urb->error_count = 0;
	402	urb->complete = audio_in_callback;
	403	}
	404
	405	return 0;
	406	}