path: root/drivers/media/video/cx231xx/cx231xx-core.c

/*
   cx231xx-core.c - driver for Conexant Cx23100/101/102
				USB video capture devices

   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
				Based on em28xx driver

   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; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include <media/v4l2-common.h>

#include "cx231xx.h"
#include "cx231xx-reg.h"

/* #define ENABLE_DEBUG_ISOC_FRAMES */

static unsigned int core_debug;
module_param(core_debug, int, 0644);
MODULE_PARM_DESC(core_debug, "enable debug messages [core]");

#define cx231xx_coredbg(fmt, arg...) do {\
	if (core_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)

static unsigned int reg_debug;
module_param(reg_debug, int, 0644);
MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");

#define cx231xx_regdbg(fmt, arg...) do {\
	if (reg_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)

static int alt = CX231XX_PINOUT;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");

#define cx231xx_isocdbg(fmt, arg...) do {\
	if (core_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)

/*****************************************************************
*             Device control list functions     				 *
******************************************************************/

static LIST_HEAD(cx231xx_devlist);
static DEFINE_MUTEX(cx231xx_devlist_mutex);

/*
 * cx231xx_realease_resources()
 * unregisters the v4l2,i2c and usb devices
 * called when the device gets disconected or at module unload
*/
void cx231xx_remove_from_devlist(struct cx231xx *dev)
{
	mutex_lock(&cx231xx_devlist_mutex);
	list_del(&dev->devlist);
	mutex_unlock(&cx231xx_devlist_mutex);
};

void cx231xx_add_into_devlist(struct cx231xx *dev)
{
	mutex_lock(&cx231xx_devlist_mutex);
	list_add_tail(&dev->devlist, &cx231xx_devlist);
	mutex_unlock(&cx231xx_devlist_mutex);
};

static LIST_HEAD(cx231xx_extension_devlist);
static DEFINE_MUTEX(cx231xx_extension_devlist_lock);

int cx231xx_register_extension(struct cx231xx_ops *ops)
{
	struct cx231xx *dev = NULL;

	mutex_lock(&cx231xx_devlist_mutex);
	mutex_lock(&cx231xx_extension_devlist_lock);
	list_add_tail(&ops->next, &cx231xx_extension_devlist);
	list_for_each_entry(dev, &cx231xx_devlist, devlist) {
		if (dev)
			ops->init(dev);
	}
	printk(KERN_INFO DRIVER_NAME ": %s initialized\n", ops->name);
	mutex_unlock(&cx231xx_extension_devlist_lock);
	mutex_unlock(&cx231xx_devlist_mutex);
	return 0;
}
EXPORT_SYMBOL(cx231xx_register_extension);

void cx231xx_unregister_extension(struct cx231xx_ops *ops)
{
	struct cx231xx *dev = NULL;

	mutex_lock(&cx231xx_devlist_mutex);
	list_for_each_entry(dev, &cx231xx_devlist, devlist) {
		if (dev)
			ops->fini(dev);
	}

	mutex_lock(&cx231xx_extension_devlist_lock);
	printk(KERN_INFO DRIVER_NAME ": %s removed\n", ops->name);
	list_del(&ops->next);
	mutex_unlock(&cx231xx_extension_devlist_lock);
	mutex_unlock(&cx231xx_devlist_mutex);
}
EXPORT_SYMBOL(cx231xx_unregister_extension);

void cx231xx_init_extension(struct cx231xx *dev)
{
	struct cx231xx_ops *ops = NULL;

	mutex_lock(&cx231xx_extension_devlist_lock);
	if (!list_empty(&cx231xx_extension_devlist)) {
		list_for_each_entry(ops, &cx231xx_extension_devlist, next) {
			if (ops->init)