/*++
linux/drivers/char/wmt-pwm.c

Copyright (c) 2008  WonderMedia Technologies, Inc.

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, see <http://www.gnu.org/licenses/>.

WonderMedia Technologies, Inc.
10F, 529, Chung-Cheng Road, Hsin-Tien, Taipei 231, R.O.C.
--*/

#define WMT_PWM_C

/*--- wmt-pwm.c ---------------------------------------------------------------
*   Copyright (C) 2009 WMT Tech. Inc.
*
* MODULE       : wmt-pwm.c
* AUTHOR       : Sam Shen
* DATE         : 2009/8/12
* DESCRIPTION  :
*-----------------------------------------------------------------------------*/

/*--- History -------------------------------------------------------------------
*Version 0.01 , Sam Shen, 2009/8/12
*	First version
*
*------------------------------------------------------------------------------*/

#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <asm/uaccess.h>
#include <linux/kdev_t.h>
#include <linux/cdev.h>
#include <linux/proc_fs.h>
#include <linux/jiffies.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/sysctl.h>

#include "wmt-pwm.h"

// #define DEBUG

#ifdef __KERNEL__
#define DPRINT		printk
#else
#define DPRINT		printf
#endif

#ifdef DEBUG
#define DBG(fmt, args...)   DPRINT("[BTM] %s: " fmt, __FUNCTION__ , ## args)
#define DBG_DETAIL(fmt, args...)   DPRINT("[BTM] %s: " fmt, __FUNCTION__ , ## args)
#else
#define DBG(fmt, args...)
#define DBG_DETAIL(fmt, args...)
#endif

#define DEVICE_NAME "WMT-PWM"
#define PWM_NUM	2		/* WM3429 has 2 pwm outputs */

struct pwm_dev_s {
	/* module parameters */

	/* char dev struct */
	struct cdev cdev;
};
#define PWM_MAJOR			239
static int pwm_dev_major = PWM_MAJOR;
static int pwm_dev_minor = 0;
static int pwm_dev_nr = 1;
static int pwm_dev_ref = 0; /* is device open */
static struct pwm_dev_s pwm_dev;

unsigned int pwm_level[2] = { 0, 0 };
unsigned int pwm_freq[2] = {16000, 16000 }; //modified by howayhuo. org: {1000, 1000 }
static unsigned int pwm_enable[2] = {0,0};

DEFINE_SEMAPHORE(pwm_lock);

#define ENV_DISPLAY_PWM "wmt.display.pwm"
#define ENV_LCD_POWER "wmt.gpo.lcd"
#define GPIO_PHY_BASE_ADDR (GPIO_BASE_ADDR-WMT_MMAP_OFFSET)

struct gpio_operation_t {
	unsigned int id;
	unsigned int act;
	unsigned int bitmap;
	unsigned int ctl;
	unsigned int oc;
	unsigned int od;
};
static struct gpio_operation_t g_lcd_pw_pin;
static int g_pwm_invert;
static int g_pwm_param;
static unsigned int g_pwm_power;

extern int wmt_getsyspara(char *varname, unsigned char *varval, int *varlen);
extern void lcd_set_enable(int enable);

void pwm_get_env(void)
{
	unsigned char buf[100];
	int varlen = 100;
	g_pwm_invert = 0;
	if( wmt_getsyspara(ENV_DISPLAY_PWM,buf,&varlen) == 0) {
		//printk(" pwm_get_env : %s = %s \n",ENV_DISPLAY_PWM,buf);
		sscanf(buf,"%x",&g_pwm_invert);
		//sscanf(buf,"%d",&g_pwm_invert);
		g_pwm_invert = (g_pwm_invert&0xFF);
		g_pwm_invert = g_pwm_invert >> 4;
	}
	memset(&g_lcd_pw_pin, 0, sizeof(struct gpio_operation_t));
	if( wmt_getsyspara(ENV_LCD_POWER,buf,&varlen) == 0) {
		//printk(" pwm_get_env : %s = %s \n",ENV_LCD_POWER,buf);
		sscanf(buf,"%x:%d:%x:%x:%x:%x",&g_lcd_pw_pin.id, &g_lcd_pw_pin.act, &g_lcd_pw_pin.bitmap, &g_lcd_pw_pin.ctl, \
				&g_lcd_pw_pin.oc, &g_lcd_pw_pin.od);
		if ((g_lcd_pw_pin.ctl&0xffff0000) == GPIO_PHY_BASE_ADDR)
			g_lcd_pw_pin.ctl += WMT_MMAP_OFFSET;
		if ((g_lcd_pw_pin.oc&0xffff0000) == GPIO_PHY_BASE_ADDR)
			g_lcd_pw_pin.oc += WMT_MMAP_OFFSET;
		if ((g_lcd_pw_pin.od&0xffff0000) == GPIO_PHY_BASE_ADDR)
			g_lcd_pw_pin.od += WMT_MMAP_OFFSET;
	}
	g_pwm_param = 1;
}

#define pwm_write_reg(addr,val,wait)	\
	REG32_VAL(addr) = val;	\
	while(REG32_VAL(PWM_STS_REG_ADDR)&=wait);

void pwm_set_control(int no,unsigned int ctrl)
{
	unsigned int addr;

	addr = PWM_CTRL_REG_ADDR + (0x10 * no);
	pwm_write_reg(addr,ctrl,PWM_CTRL_UPDATE << (8*no));
} /* End of pwm_proc */

void pwm_set_scalar(int no,unsigned int scalar)
{
	unsigned int addr;

	addr = PWM_SCALAR_REG_ADDR + (0x10 * no);
	pwm_write_reg(addr,scalar,PWM_SCALAR_UPDATE << (8*no));
}

void pwm_set_period(int no,unsigned int period)
{
	unsigned int addr;

	addr = PWM_PERIOD_REG_ADDR + (0x10 * no);
	pwm_write_reg(addr,period,PWM_PERIOD_UPDATE << (8*no));
}

void pwm_set_duty(int no,unsigned int duty)
{
	unsigned int addr;

	addr = PWM_DUTY_REG_ADDR + (0x10 * no);
	pwm_write_reg(addr,duty,PWM_DUTY_UPDATE << (8*no));
}

unsigned int pwm_get_period(int no)
{
	unsigned int addr;

	addr = PWM_PERIOD_REG_ADDR + (0x10 * no);
	return (REG32_VAL(addr) & 0xFFF);
}

unsigned int pwm_get_duty(int no)
{
	unsigned int addr;

	addr = PWM_DUTY_REG_ADDR + (0x10 * no);
	return (REG32_VAL(addr) & 0xFFF);
}

unsigned int get_lcd_power(void)
{
	return g_pwm_power;
/*
	unsigned int val, reg;

	if ((g_lcd_pw_pin.ctl == 0) || (g_lcd_pw_pin.oc == 0) || (g_lcd_pw_pin.od == 0)) {
		printk("lcd power ping not define\n");
		return 0;
	}
	val = 1<<g_lcd_pw_pin.bitmap;
	reg = 0;
	reg = REG32_VAL(g_lcd_pw_pin.ctl);
	if (!(reg&val))
		return 0;
	reg = REG32_VAL(g_lcd_pw_pin.oc);
	if (!(reg&val))
		return 0;
	reg = REG32_VAL(g_lcd_pw_pin.od);
	reg = (reg&val);
	if (g_lcd_pw_pin.act) {
		if (reg)
			return 1;
	} else {
		if (!reg)
			return 1;
	}
	return 0;
*/
}

void set_lcd_power(int on)
{
	unsigned int val;

	if ((g_lcd_pw_pin.ctl == 0) || (g_lcd_pw_pin.oc == 0) || (g_lcd_pw_pin.od == 0)) {
		printk("lcd power ping not define\n");
		return;
	}

	val = 1<<g_lcd_pw_pin.bitmap;
	if (g_lcd_pw_pin.act == 0)
		on = ~on;

	if (on) {
		REG32_VAL(g_lcd_pw_pin.od) |= val;
	} else {
		REG32_VAL(g_lcd_pw_pin.od) &= ~val;
	}
	REG32_VAL(g_lcd_pw_pin.ctl) |= val;
	REG32_VAL(g_lcd_pw_pin.oc) |= val;
	//printk("ctl = %x , oc = %x , od = %x\n",REG32_VAL(g_lcd_pw_pin.ctl),REG32_VAL(g_lcd_pw_pin.oc),REG32_VAL(g_lcd_pw_pin.od));

}
void pwm_set_gpio(int no,int enable)
{
	unsigned int pwm_pin;

	if( enable ) {
		REG8_VAL(GPIO_OD_GP20_PWM0_BYTE_ADDR) &= 0xFE;
		REG8_VAL(GPIO_CTRL_GP20_PWM0_BYTE_ADDR) &= 0xFE;
	} else {
		REG8_VAL(GPIO_OD_GP20_PWM0_BYTE_ADDR) &= 0xFE;
		REG8_VAL(GPIO_OC_GP20_PWM0_BYTE_ADDR) |= 0x01;
		REG8_VAL(GPIO_CTRL_GP20_PWM0_BYTE_ADDR) |= 0x01;
	}
	/* set to PWM mode */
	if ( no == 0 )
		REG32_VAL(PIN_SHARING_SEL_4BYTE_ADDR) &= ~0x1000;
	else if( no == 1 )
		REG32_VAL(PIN_SHARING_SEL_4BYTE_ADDR) &= ~0x80;
	g_pwm_power = (unsigned int)enable;
	//lcd_set_enable(enable);
	/*set_lcd_power(enable);*/

}

void pwm_set_enable(int no,int enable)
{
	unsigned int addr,reg;

	if (g_pwm_param == 0)
		pwm_get_env();
	pwm_enable[no] = enable;
	addr = PWM_CTRL_REG_ADDR + (0x10 * no);
	reg = REG32_VAL(addr);
	if( enable ){
		reg |= PWM_ENABLE;
	}
	else {
		reg &= ~PWM_ENABLE;
	}
	pwm_write_reg(addr,reg,PWM_CTRL_UPDATE << (4*no));
	pwm_set_gpio(no,enable);
}

unsigned int pwm_get_enable(int no)
{
	unsigned int addr,reg;

	addr = PWM_CTRL_REG_ADDR + (0x10 * no);
	reg = REG32_VAL(addr);
	reg &= PWM_ENABLE;
	return reg;
}

void pwm_set_freq(int no,unsigned int freq)
{
	unsigned int clock;
	unsigned int reg;

	auto_pll_divisor(DEV_PWM,CLK_ENABLE,0,0);

	pwm_freq[no] = freq;

	clock = auto_pll_divisor(DEV_PWM,GET_FREQ,0,0);

	reg = (clock / freq / PWM_PERIOD_VAL) -1;
	pwm_set_scalar(no,reg);
}

void pwm_set_level(int no,unsigned int level)
{
	unsigned int duty,period;

	auto_pll_divisor(DEV_PWM,CLK_ENABLE,0,0);

	if (g_pwm_param == 0)
		pwm_get_env();
	pwm_level[no] = level;
	period = PWM_PERIOD_VAL - 1;
	duty = (level * PWM_PERIOD_VAL / 100);
	duty = (duty)? (duty-1):0;

	pwm_set_period(no,period);
	pwm_set_duty(no,duty);
	if (g_pwm_invert)
		pwm_set_control(no,(level)? 0x37:0x8);
	else
	pwm_set_control(no,(level)? 0x35:0x8);
	pwm_set_gpio(no,level);
}

void pwm_get_config(int no,unsigned int *freq,unsigned int *level)
{
	*freq = pwm_freq[no];
	*level = pwm_level[no];
}

#ifdef CONFIG_PROC_FS
static int pwm_do_freq0_proc(ctl_table * ctl,int write,void *buffer,size_t * len,loff_t *ppos)
{
	int ret = -1;

	ret = proc_dointvec(ctl, write, buffer, len, ppos);
	if (write)
		pwm_set_freq(0, pwm_freq[0]);

	return ret;
}

static int pwm_do_freq1_proc(ctl_table * ctl,int write,void *buffer,size_t * len,loff_t *ppos)
{
	int ret = -1;

	ret = proc_dointvec(ctl, write, buffer, len, ppos);
	if (write)
		pwm_set_freq(1, pwm_freq[1]);

	return ret;
}

static int pwm_do_level0_proc(ctl_table * ctl,int write,void *buffer,size_t * len,loff_t *ppos)
{
	int ret = -1;

	ret = proc_dointvec(ctl, write, buffer, len, ppos);
	if (write)
		pwm_set_level(0, pwm_level[0]);

	return ret;
}

static int pwm_do_level1_proc(ctl_table * ctl,int write,void *buffer,size_t * len,loff_t *ppos)
{
	int ret = -1;

	ret = proc_dointvec(ctl, write, buffer, len, ppos);
	if (write)
		pwm_set_level(1, pwm_level[1]);

	return ret;
}

static ctl_table pwm_table[] = {
    {
		.procname	= "freq0",
		.data		= &pwm_freq[0],
		.maxlen		= sizeof(int),
		.mode		= 0666,
		.proc_handler = &pwm_do_freq0_proc,
	},
    {
		.procname	= "freq1",
		.data		= &pwm_freq[1],
		.maxlen		= sizeof(int),
		.mode		= 0666,
		.proc_handler = &pwm_do_freq1_proc,
	},
    {
		.procname	= "level0",
		.data		= &pwm_level[0],
		.maxlen		= sizeof(int),
		.mode		= 0666,
		.proc_handler = &pwm_do_level0_proc,
	},
    {
		.procname	= "level1",
		.data		= &pwm_level[1],
		.maxlen		= sizeof(int),
		.mode		= 0666,
		.proc_handler = &pwm_do_level1_proc,
	},
	{ }
};

static ctl_table pwm_root_table[] = {
	{
		.procname	= "pwm",	// create path ==> /proc/sys/vpp
		.mode		= 0555,
		.child 		= pwm_table
	},
	{ }
};
static struct ctl_table_header *pwm_table_header;
#endif

/*!*************************************************************************
* pwm_open()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static int pwm_open
(
	struct inode *inode,	/*!<; //[IN] a pointer point to struct inode */
	struct file *filp		/*!<; //[IN] a pointer point to struct file  */
)
{
	struct pwm_dev_s *dev;
	int minor_no;

	DBG("Enter pwm_open\n");

	if(pwm_dev_ref)
		return -EBUSY;

	pwm_dev_ref++;

	try_module_get(THIS_MODULE);

	dev = container_of(inode->i_cdev,struct pwm_dev_s,cdev);
	filp->private_data = dev;
	minor_no = iminor(inode);	/* get */

	/* TODO */
	/* Step 1: check  hardware resource */

	/* Step 2: if first then initial hardware */

	/* Step 3: update f_op pointer */

	/* Step 4: allocate and assign provate_data structure */
	/* filp->private_data */

	return 0;
} /* End of pwm_open() */

/*!*************************************************************************
* pwm_release()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static int pwm_release
(
	struct inode *inode,	/*!<; //[IN] a pointer point to struct inode */
	struct file *filp		/*!<; //[IN] a pointer point to struct file  */
)
{
	struct pwm_dev_s *dev;

	DBG("Enter pwm_release\n");

	dev = container_of(inode->i_cdev,struct pwm_dev_s,cdev);

	pwm_dev_ref--;
	module_put(THIS_MODULE);

	/* TODO */
	/* Step 1: free private data resource */

	/* Step 2: if last then shutdown hardware */
	return 0;
} /* End of pwm_release() */

/*!*************************************************************************
* pwm_ioctl()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static long pwm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	int err = 0;
	int retval = 0;
	pwm_ctrl_t parm;

	/* check type and number, if fail return ENOTTY */
	if( _IOC_TYPE(cmd) != PWM_IOC_MAGIC )	return -ENOTTY;
	if( _IOC_NR(cmd) >= PWM_IOC_MAXNR )	return -ENOTTY;

	/* check argument area */
	if( _IOC_DIR(cmd) & _IOC_READ )
		err = !access_ok( VERIFY_WRITE, (void __user *) arg, _IOC_SIZE(cmd));
	else if ( _IOC_DIR(cmd) & _IOC_WRITE )
		err = !access_ok( VERIFY_READ, (void __user *) arg, _IOC_SIZE(cmd));

	if( err ) return -EFAULT;

	down(&pwm_lock);

	switch(cmd){
		case PWMIOSET_ENABLE:
			copy_from_user( (void *) &parm, (const void *)arg, sizeof(pwm_ctrl_t));
			pwm_set_enable(parm.no,parm.value);
			break;
		case PWMIOSET_FREQ:
			copy_from_user( (void *) &parm, (const void *)arg, sizeof(pwm_ctrl_t));
			pwm_freq[parm.no] = parm.value;
			pwm_set_freq(parm.no,parm.value);
			break;
		case PWMIOGET_FREQ:
			copy_from_user( (void *) &parm, (const void *)arg, sizeof(pwm_ctrl_t));
			parm.value = pwm_freq[parm.no];
			copy_to_user((void *) arg,(void *) &parm, sizeof(pwm_ctrl_t));
			break;
		case PWMIOSET_LEVEL:
			copy_from_user( (void *) &parm, (const void *)arg, sizeof(pwm_ctrl_t));
			pwm_level[parm.no] = parm.value;
			pwm_set_level(parm.no,parm.value);
			break;
		case PWMIOGET_LEVEL:
			copy_from_user( (void *) &parm, (const void *)arg, sizeof(pwm_ctrl_t));
			parm.value = pwm_level[parm.no];
			copy_to_user((void *) arg,(void *) &parm, sizeof(pwm_ctrl_t));
			break;
		default:
			retval = -ENOTTY;
			break;
	}

	up(&pwm_lock);
	return retval;
} /* End of pwm_ioctl() */

/*!*************************************************************************
	driver file operations struct define
****************************************************************************/
struct file_operations pwm_fops = {
	.owner = THIS_MODULE,
	.open = pwm_open,
	.unlocked_ioctl = pwm_ioctl,
	.release = pwm_release,
};

/*!*************************************************************************
* pwm_probe()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static int pwm_probe
(
	struct platform_device *pdev	/*!<; // please add parameters description her*/
)
{
	int ret = 0;
	dev_t dev_no;
	struct cdev *cdev;

	dev_no = MKDEV(pwm_dev_major,pwm_dev_minor);

	/* register char device */
	// cdev = cdev_alloc();
	cdev = &pwm_dev.cdev;
	cdev_init(cdev,&pwm_fops);
	ret = cdev_add(cdev,dev_no,1);

	if( ret ){
		printk(KERN_ALERT "*E* register char dev \n");
		return ret;
	}

//	printk( KERN_ALERT "/dev/%s major number %d, minor number %d\n", DEVICE_NAME, pwm_dev_major,pwm_dev_minor);

#ifdef CONFIG_PROC_FS
	pwm_table_header = register_sysctl_table(pwm_root_table);
#endif
	return ret;
} /* End of pwm_probe() */

/*!*************************************************************************
* pwm_remove()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static int pwm_remove
(
	struct platform_device *dev	/*!<; // please add parameters description her*/
)
{
	struct cdev *cdev;

	cdev = &pwm_dev.cdev;
	cdev_del(cdev);
	printk( KERN_ALERT "Enter pwm_remove \n");
	return 0;
} /* End of pwm_remove() */

/*!*************************************************************************
* pwm_suspend()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static int pwm_suspend
(
	struct platform_device *pdev,     /*!<; // a pointer point to struct device */
	pm_message_t state		/*!<; // suspend state */
)
{
#ifndef CONFIG_ANDROID
	int i;
	for (i=0;i<PWM_NUM;i++) {
		pwm_enable[i] = pwm_get_enable(i);
	}
#endif
	return 0;
} /* End of btm_suspend() */

/*!*************************************************************************
* pwm_resume()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static int pwm_resume
(
	struct platform_device *pdev 	/*!<; // a pointer point to struct device */
)
{
#ifndef CONFIG_ANDROID
	int i;
	for (i=0; i<PWM_NUM; i++) {
		pwm_set_enable(i, pwm_enable[i]);
		pwm_set_freq(i, pwm_freq[i]);
		pwm_set_level(i, pwm_level[i]);
	}
#endif
	auto_pll_divisor(DEV_PWM,CLK_ENABLE,0,0);
	return 0;
} /* End of pwm_resume() */

/*!*************************************************************************
	device driver struct define
****************************************************************************/
static struct platform_driver pwm_driver = {
	.driver.name           = "wmt-pwm", // This name should equal to platform device name.
	.probe          = pwm_probe,
	.remove         = pwm_remove,
	.suspend        = pwm_suspend,
	.resume         = pwm_resume
};

/*!*************************************************************************
* pwm_platform_release()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static void pwm_platform_release
(
	struct device *device	/*!<; // please add parameters description her*/
)
{
} /* End of pwm_platform_release() */

/*!*************************************************************************
	platform device struct define
****************************************************************************/
#if 0
static struct resource pwm_resources[] = {
	[0] = {
		.start  = 0xf8011400,
		.end    = 0xf80117ff,
		.flags  = IORESOURCE_MEM,
	},
};

static u64 pwm_dma_mask = 0xffffffffUL;
#endif

static struct platform_device pwm_device = {
	.name           = "wmt-pwm",
	.id             = 0,
	.dev            = 	{	.release = pwm_platform_release,
#if 0
							.dma_mask = &pwm_dma_mask,
							.coherent_dma_mask = ~0,
#endif
						},
	.num_resources  = 0,		/* ARRAY_SIZE(btm_resources), */
	.resource       = NULL,		/* pwm_resources, */
};

/*!*************************************************************************
* pwm_init()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static int pwm_init(void)
{
	int ret;
	dev_t dev_no;

	printk("Enter pwm_init\n");

	if( pwm_dev_major ){
		dev_no = MKDEV(pwm_dev_major,pwm_dev_minor);
		ret = register_chrdev_region(dev_no,pwm_dev_nr,"wmt-pwm");
	}
	else {
		ret = alloc_chrdev_region(&dev_no,pwm_dev_minor,pwm_dev_nr,"wmt-pwm");
		pwm_dev_major = MAJOR(dev_no);
	}

	if( ret < 0 ){
		printk(KERN_ALERT "*E* can't get major %d\n",pwm_dev_major);
		return ret;
	}

	ret = platform_driver_register(&pwm_driver);
	if (!ret) {
		ret = platform_device_register(&pwm_device);
		if (ret)
			platform_driver_unregister(&pwm_driver);
	}

	auto_pll_divisor(DEV_PWM,CLK_ENABLE,0,0);
	if (g_pwm_param == 0)
		pwm_get_env();

	return ret;
} /* End of pwm_init() */

module_init(pwm_init);

/*!*************************************************************************
* pwm_exit()
*
* Private Function by Sam Shen, 2009/8/12
*/
/*!
* \brief
*
* \retval  0 if success
*/
static void pwm_exit(void)
{
	dev_t dev_no;

	printk(KERN_ALERT "Enter pwm_exit\n");

	platform_driver_unregister(&pwm_driver);
	platform_device_unregister(&pwm_device);
	dev_no = MKDEV(pwm_dev_major,pwm_dev_minor);
	unregister_chrdev_region(dev_no,pwm_dev_nr);
	return;
} /* End of pwm_exit() */

module_exit(pwm_exit);

MODULE_AUTHOR("WonderMedia Technologies, Inc.");
MODULE_DESCRIPTION("WMT [PWM] driver");
MODULE_LICENSE("GPL");

/*--------------------End of Function Body -----------------------------------*/

#undef WMT_PWM_C