[linux-2.6-block.git] / drivers / staging / line6 / dumprequest.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 "dumprequest.h"


/*
	Set "dump in progress" flag.
*/
void line6_dump_started(struct line6_dump_request *l6dr, int dest)
{
	l6dr->in_progress = dest;
}

/*
	Invalidate current channel, i.e., set "dump in progress" flag.
	Reading from the "dump" special file blocks until dump is completed.
*/
void line6_invalidate_current(struct line6_dump_request *l6dr)
{
	line6_dump_started(l6dr, LINE6_DUMP_CURRENT);
}

/*
	Clear "dump in progress" flag and notify waiting processes.
*/
void line6_dump_finished(struct line6_dump_request *l6dr)
{
	l6dr->in_progress = LINE6_DUMP_NONE;
	wake_up_interruptible(&l6dr->wait);
}

/*
	Send an asynchronous channel dump request.
*/
int line6_dump_request_async(struct line6_dump_request *l6dr,
			     struct usb_line6 *line6, int num)
{
	int ret;
	line6_invalidate_current(l6dr);
	ret = line6_send_raw_message_async(line6, l6dr->reqbufs[num].buffer,
					   l6dr->reqbufs[num].length);

	if (ret < 0)
		line6_dump_finished(l6dr);

	return ret;
}

/*
	Send an asynchronous dump request after a given interval.
*/
void line6_startup_delayed(struct line6_dump_request *l6dr, int seconds,
			   void (*function)(unsigned long), void *data)
{
	l6dr->timer.expires = jiffies + seconds * HZ;
	l6dr->timer.function = function;
	l6dr->timer.data = (unsigned long)data;
	add_timer(&l6dr->timer);
}

/*
	Wait for completion.
*/
int line6_wait_dump(struct line6_dump_request *l6dr, int nonblock)
{
	int retval = 0;
	DECLARE_WAITQUEUE(wait, current);
	add_wait_queue(&l6dr->wait, &wait);
	current->state = TASK_INTERRUPTIBLE;

	while (l6dr->in_progress) {
		if (nonblock) {
			retval = -EAGAIN;
			break;
		}

		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		} else
			schedule();
	}

	current->state = TASK_RUNNING;
	remove_wait_queue(&l6dr->wait, &wait);
	return retval;
}

/*
	Initialize dump request buffer.
*/
int line6_dumpreq_initbuf(struct line6_dump_request *l6dr, const void *buf,
			  size_t len, int num)
{
	l6dr->reqbufs[num].buffer = kmalloc(len, GFP_KERNEL);
	if (l6dr->reqbufs[num].buffer == NULL)
		return -ENOMEM;
	memcpy(l6dr->reqbufs[num].buffer, buf, len);
	l6dr->reqbufs[num].length = len;
	return 0;
}

/*
	Initialize dump request data structure (including one buffer).
*/
int line6_dumpreq_init(struct line6_dump_request *l6dr, const void *buf,
		       size_t len)
{
	int ret;
	ret = line6_dumpreq_initbuf(l6dr, buf, len, 0);
	if (ret < 0)
		return ret;
	init_waitqueue_head(&l6dr->wait);
	init_timer(&l6dr->timer);
	return 0;
}

/*
	Destruct dump request data structure.
*/
void line6_dumpreq_destructbuf(struct line6_dump_request *l6dr, int num)
{
	if (l6dr == NULL)
		return;
	if (l6dr->reqbufs[num].buffer == NULL)
		return;
	kfree(l6dr->reqbufs[num].buffer);
	l6dr->reqbufs[num].buffer = NULL;
}

/*
	Destruct dump request data structure.
*/
void line6_dumpreq_destruct(struct line6_dump_request *l6dr)
{
	if (l6dr->reqbufs[0].buffer == NULL)
		return;
	line6_dumpreq_destructbuf(l6dr, 0);
	l6dr->ok = 1;
	del_timer_sync(&l6dr->timer);
}
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	#include "dumprequest.h"
	14
	15
	16	/*
	17	Set "dump in progress" flag.
	18	*/
	19	void line6_dump_started(struct line6_dump_request *l6dr, int dest)
	20	{
	21	l6dr->in_progress = dest;
	22	}
	23
	24	/*
	25	Invalidate current channel, i.e., set "dump in progress" flag.
	26	Reading from the "dump" special file blocks until dump is completed.
	27	*/
	28	void line6_invalidate_current(struct line6_dump_request *l6dr)
	29	{
	30	line6_dump_started(l6dr, LINE6_DUMP_CURRENT);
	31	}
	32
	33	/*
	34	Clear "dump in progress" flag and notify waiting processes.
	35	*/
	36	void line6_dump_finished(struct line6_dump_request *l6dr)
	37	{
	38	l6dr->in_progress = LINE6_DUMP_NONE;
	39	wake_up_interruptible(&l6dr->wait);
	40	}
	41
	42	/*
	43	Send an asynchronous channel dump request.
	44	*/
766f9d20 GKH	45	int line6_dump_request_async(struct line6_dump_request *l6dr,
766f9d20 GKH	46	struct usb_line6 *line6, int num)
705ececd MG	47	{
	48	int ret;
	49	line6_invalidate_current(l6dr);
766f9d20 GKH	50	ret = line6_send_raw_message_async(line6, l6dr->reqbufs[num].buffer,
766f9d20 GKH	51	l6dr->reqbufs[num].length);
705ececd	52
766f9d20	53	if (ret < 0)
705ececd MG	54	line6_dump_finished(l6dr);
	55
	56	return ret;
	57	}
	58
	59	/*
	60	Send an asynchronous dump request after a given interval.
	61	*/
	62	void line6_startup_delayed(struct line6_dump_request *l6dr, int seconds,
766f9d20	63	void (function)(unsigned long), void data)
705ececd MG	64	{
	65	l6dr->timer.expires = jiffies + seconds * HZ;
	66	l6dr->timer.function = function;
	67	l6dr->timer.data = (unsigned long)data;
	68	add_timer(&l6dr->timer);
	69	}
	70
	71	/*
	72	Wait for completion.
	73	*/
	74	int line6_wait_dump(struct line6_dump_request *l6dr, int nonblock)
	75	{
	76	int retval = 0;
	77	DECLARE_WAITQUEUE(wait, current);
	78	add_wait_queue(&l6dr->wait, &wait);
	79	current->state = TASK_INTERRUPTIBLE;
	80
766f9d20 GKH	81	while (l6dr->in_progress) {
766f9d20 GKH	82	if (nonblock) {
705ececd MG	83	retval = -EAGAIN;
	84	break;
	85	}
	86
766f9d20	87	if (signal_pending(current)) {
705ececd MG	88	retval = -ERESTARTSYS;
705ececd MG	89	break;
766f9d20	90	} else
705ececd MG	91	schedule();
	92	}
	93
	94	current->state = TASK_RUNNING;
	95	remove_wait_queue(&l6dr->wait, &wait);
	96	return retval;
	97	}
	98
	99	/*
	100	Initialize dump request buffer.
	101	*/
766f9d20 GKH	102	int line6_dumpreq_initbuf(struct line6_dump_request l6dr, const void buf,
766f9d20 GKH	103	size_t len, int num)
705ececd MG	104	{
705ececd MG	105	l6dr->reqbufs[num].buffer = kmalloc(len, GFP_KERNEL);
766f9d20 GKH	106	if (l6dr->reqbufs[num].buffer == NULL)
766f9d20 GKH	107	return -ENOMEM;
705ececd MG	108	memcpy(l6dr->reqbufs[num].buffer, buf, len);
	109	l6dr->reqbufs[num].length = len;
	110	return 0;
	111	}
	112
	113	/*
	114	Initialize dump request data structure (including one buffer).
	115	*/
766f9d20 GKH	116	int line6_dumpreq_init(struct line6_dump_request l6dr, const void buf,
766f9d20 GKH	117	size_t len)
705ececd MG	118	{
	119	int ret;
	120	ret = line6_dumpreq_initbuf(l6dr, buf, len, 0);
766f9d20 GKH	121	if (ret < 0)
766f9d20 GKH	122	return ret;
705ececd MG	123	init_waitqueue_head(&l6dr->wait);
	124	init_timer(&l6dr->timer);
	125	return 0;
	126	}
	127
	128	/*
	129	Destruct dump request data structure.
	130	*/
	131	void line6_dumpreq_destructbuf(struct line6_dump_request *l6dr, int num)
	132	{
766f9d20 GKH	133	if (l6dr == NULL)
	134	return;
	135	if (l6dr->reqbufs[num].buffer == NULL)
	136	return;
705ececd MG	137	kfree(l6dr->reqbufs[num].buffer);
	138	l6dr->reqbufs[num].buffer = NULL;
	139	}
	140
	141	/*
	142	Destruct dump request data structure.
	143	*/
	144	void line6_dumpreq_destruct(struct line6_dump_request *l6dr)
	145	{
766f9d20 GKH	146	if (l6dr->reqbufs[0].buffer == NULL)
766f9d20 GKH	147	return;
705ececd MG	148	line6_dumpreq_destructbuf(l6dr, 0);
	149	l6dr->ok = 1;
	150	del_timer_sync(&l6dr->timer);
	151	}