[linux-2.6-block.git] / drivers / char / genrtc.c

/*
 *	Real Time Clock interface for
 *		- q40 and other m68k machines,
 *		- HP PARISC machines
 *		- PowerPC machines
 *      emulate some RTC irq capabilities in software
 *
 *      Copyright (C) 1999 Richard Zidlicky
 *
 *	based on Paul Gortmaker's rtc.c device and
 *           Sam Creasey Generic rtc driver
 *
 *	This driver allows use of the real time clock (built into
 *	nearly all computers) from user space. It exports the /dev/rtc
 *	interface supporting various ioctl() and also the /proc/driver/rtc
 *	pseudo-file for status information.
 *
 *	The ioctls can be used to set the interrupt behaviour where
 *	supported.
 *
 *	The /dev/rtc interface will block on reads until an interrupt
 *	has been received. If a RTC interrupt has already happened,
 *	it will output an unsigned long and then block. The output value
 *	contains the interrupt status in the low byte and the number of
 *	interrupts since the last read in the remaining high bytes. The
 *	/dev/rtc interface can also be used with the select(2) call.
 *
 *	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.
 *

 *      1.01 fix for 2.3.X                    rz@linux-m68k.org
 *      1.02 merged with code from genrtc.c   rz@linux-m68k.org
 *      1.03 make it more portable            zippel@linux-m68k.org
 *      1.04 removed useless timer code       rz@linux-m68k.org
 *      1.05 portable RTC_UIE emulation       rz@linux-m68k.org
 *      1.06 set_rtc_time can return an error trini@kernel.crashing.org
 *      1.07 ported to HP PARISC (hppa)	      Helge Deller <deller@gmx.de>
 */

#define RTC_VERSION	"1.07"

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/fcntl.h>

#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/smp_lock.h>
#include <linux/workqueue.h>

#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/rtc.h>

/*
 *	We sponge a minor off of the misc major. No need slurping
 *	up another valuable major dev number for this. If you add
 *	an ioctl, make sure you don't conflict with SPARC's RTC
 *	ioctls.
 */

static DECLARE_WAIT_QUEUE_HEAD(gen_rtc_wait);

/*
 *	Bits in gen_rtc_status.
 */

#define RTC_IS_OPEN		0x01	/* means /dev/rtc is in use	*/

static unsigned char gen_rtc_status;	/* bitmapped status byte.	*/
static unsigned long gen_rtc_irq_data;	/* our output to the world	*/

/* months start at 0 now */
static unsigned char days_in_mo[] =
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

static int irq_active;

#ifdef CONFIG_GEN_RTC_X
static struct work_struct genrtc_task;
static struct timer_list timer_task;

static unsigned int oldsecs;
static int lostint;
static unsigned long tt_exp;

static void gen_rtc_timer(unsigned long data);

static volatile int stask_active;              /* schedule_work */
static volatile int ttask_active;              /* timer_task */
static int stop_rtc_timers;                    /* don't requeue tasks */
static DEFINE_SPINLOCK(gen_rtc_lock);

static void gen_rtc_interrupt(unsigned long arg);

/*
 * Routine to poll RTC seconds field for change as often as possible,
 * after first RTC_UIE use timer to reduce polling
 */
static void genrtc_troutine(struct work_struct *work)
{
	unsigned int tmp = get_rtc_ss();
	
	if (stop_rtc_timers) {
		stask_active = 0;
		return;
	}

	if (oldsecs != tmp){
		oldsecs = tmp;

		timer_task.function = gen_rtc_timer;
		timer_task.expires = jiffies + HZ - (HZ/10);
		tt_exp=timer_task.expires;
		ttask_active=1;
		stask_active=0;
		add_timer(&timer_task);

		gen_rtc_interrupt(0);
	} else if (schedule_work(&genrtc_task) == 0)
		stask_active = 0;
}

static void gen_rtc_timer(unsigned long data)
{
	lostint = get_rtc_ss() - oldsecs ;
	if (lostint<0) 
		lostint = 60 - lostint;
	if (time_after(jiffies, tt_exp))
		printk(KERN_INFO "genrtc: timer task delayed by %ld jiffies\n",
		       jiffies-tt_exp);
	ttask_active=0;
	stask_active=1;
	if ((schedule_work(&genrtc_task) == 0))
		stask_active = 0;
}

/* 
 * call gen_rtc_interrupt function to signal an RTC_UIE,
 * arg is unused.
 * Could be invoked either from a real interrupt handler or
 * from some routine that periodically (eg 100HZ) monitors
 * whether RTC_SECS changed
 */
static void gen_rtc_interrupt(unsigned long arg)
{
	/*  We store the status in the low byte and the number of
	 *	interrupts received since the last read in the remainder
	 *	of rtc_irq_data.  */

	gen_rtc_irq_data += 0x100;
	gen_rtc_irq_data &= ~0xff;
	gen_rtc_irq_data |= RTC_UIE;

	if (lostint){
		printk("genrtc: system delaying clock ticks?\n");
		/* increment count so that userspace knows something is wrong */
		gen_rtc_irq_data += ((lostint-1)<<8);
		lostint = 0;
	}

	wake_up_interruptible(&gen_rtc_wait);
}

/*
 *	Now all the various file operations that we export.
 */
static ssize_t gen_rtc_read(struct file *file, char __user *buf,
			size_t count, loff_t *ppos)
{
	unsigned long data;
	ssize_t retval;

	if (count != sizeof (unsigned int) && count != sizeof (unsigned long))
		return -EINVAL;

	if (file->f_flags & O_NONBLOCK && !gen_rtc_irq_data)
		return -EAGAIN;

	retval = wait_event_interruptible(gen_rtc_wait,
			(data = xchg(&gen_rtc_irq_data, 0)));
	if (retval)
		goto out;

	/* first test allows optimizer to nuke this case for 32-bit machines */
	if (sizeof (int) != sizeof (long) && count == sizeof (unsigned int)) {
		unsigned int uidata = data;
		retval = put_user(uidata, (unsigned int __user *)buf) ?:
			sizeof(unsigned int);
	}
	else {
		retval = put_user(data, (unsigned long __user *)buf) ?:
			sizeof(unsigned long);
	}
out:
	return retval;
}

static unsigned int gen_rtc_poll(struct file *file,
				 struct poll_table_struct *wait)
{
	poll_wait(file, &gen_rtc_wait, wait);
	if (gen_rtc_irq_data != 0)
		return POLLIN | POLLRDNORM;
	return 0;
}

#endif

/*
 * Used to disable/enable interrupts, only RTC_UIE supported
 * We also clear out any old irq data after an ioctl() that
 * meddles with the interrupt enable/disable bits.
 */

static inline void gen_clear_rtc_irq_bit(unsigned char bit)
{
#ifdef CONFIG_GEN_RTC_X
	stop_rtc_timers = 1;
	if (ttask_active){
		del_timer_sync(&timer_task);
		ttask_active = 0;
	}
	while (stask_active)
		schedule();

	spin_lock(&gen_rtc_lock);
	irq_active = 0;
	spin_unlock(&gen_rtc_lock);
#endif
}

static inline int gen_set_rtc_irq_bit(unsigned char bit)
{
#ifdef CONFIG_GEN_RTC_X
	spin_lock(&gen_rtc_lock);
	if ( !irq_active ) {
		irq_active = 1;
		stop_rtc_timers = 0;
		lostint = 0;
		INIT_WORK(&genrtc_task, genrtc_troutine);
		oldsecs = get_rtc_ss();
		init_timer(&timer_task);

		stask_active = 1;
		if (schedule_work(&genrtc_task) == 0){
			stask_active = 0;
		}
	}
	spin_unlock(&gen_rtc_lock);
	gen_rtc_irq_data = 0;
	return 0;
#else
	return -EINVAL;
#endif
}

static int gen_rtc_ioctl(struct inode *inode, struct file *file,
			 unsigned int cmd, unsigned long arg)
{
	struct rtc_time wtime;
	struct rtc_pll_info pll;
	void __user *argp = (void __user *)arg;

	switch (cmd) {

	case RTC_PLL_GET:
	    if (get_rtc_pll(&pll))
	 	    return -EINVAL;
	    else
		    return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;

	case RTC_PLL_SET:
		if (!capable(CAP_SYS_TIME))
			return -EACCES;
		if (copy_from_user(&pll, argp, sizeof(pll)))
			return -EFAULT;
	    return set_rtc_pll(&pll);

	case RTC_UIE_OFF:	/* disable ints from RTC updates.	*/
		gen_clear_rtc_irq_bit(RTC_UIE);
		return 0;

	case RTC_UIE_ON:	/* enable ints for RTC updates.	*/
	        return gen_set_rtc_irq_bit(RTC_UIE);

	case RTC_RD_TIME:	/* Read the time/date from RTC	*/
		/* this doesn't get week-day, who cares */
		memset(&wtime, 0, sizeof(wtime));
		get_rtc_time(&wtime);

		return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;

	case RTC_SET_TIME:	/* Set the RTC */
	    {
		int year;
		unsigned char leap_yr;

		if (!capable(CAP_SYS_TIME))
			return -EACCES;

		if (copy_from_user(&wtime, argp, sizeof(wtime)))
			return -EFAULT;

		year = wtime.tm_year + 1900;
		leap_yr = ((!(year % 4) && (year % 100)) ||
			   !(year % 400));

		if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) || (wtime.tm_mday < 1))
			return -EINVAL;

		if (wtime.tm_mday < 0 || wtime.tm_mday >
		    (days_in_mo[wtime.tm_mon] + ((wtime.tm_mon == 1) && leap_yr)))
			return -EINVAL;

		if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 ||
		    wtime.tm_min < 0 || wtime.tm_min >= 60 ||
		    wtime.tm_sec < 0 || wtime.tm_sec >= 60)
			return -EINVAL;

		return set_rtc_time(&wtime);
	    }
	}

	return -EINVAL;
}

/*
 *	We enforce only one user at a time here with the open/close.
 *	Also clear the previous interrupt data on an open, and clean
 *	up things on a close.
 */

static int gen_rtc_open(struct inode *inode, struct file *file)
{
	lock_kernel();
	if (gen_rtc_status & RTC_IS_OPEN) {
		unlock_kernel();
		return -EBUSY;
	}

	gen_rtc_status |= RTC_IS_OPEN;
	gen_rtc_irq_data = 0;
	irq_active = 0;
	unlock_kernel();

	return 0;
}

static int gen_rtc_release(struct inode *inode, struct file *file)
{
	/*
	 * Turn off all interrupts once the device is no longer
	 * in use and clear the data.
	 */

	gen_clear_rtc_irq_bit(RTC_PIE|RTC_AIE|RTC_UIE);

	gen_rtc_status &= ~RTC_IS_OPEN;
	return 0;
}


#ifdef CONFIG_PROC_FS

/*
 *	Info exported via "/proc/driver/rtc".
 */

static int gen_rtc_proc_output(char *buf)
{
	char *p;
	struct rtc_time tm;
	unsigned int flags;
	struct rtc_pll_info pll;

	p = buf;

	flags = get_rtc_time(&tm);

	p += sprintf(p,
		     "rtc_time\t: %02d:%02d:%02d\n"
		     "rtc_date\t: %04d-%02d-%02d\n"
		     "rtc_epoch\t: %04u\n",
		     tm.tm_hour, tm.tm_min, tm.tm_sec,
		     tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 1900);

	tm.tm_hour = tm.tm_min = tm.tm_sec = 0;

	p += sprintf(p, "alarm\t\t: ");
	if (tm.tm_hour <= 24)
		p += sprintf(p, "%02d:", tm.tm_hour);
	else
		p += sprintf(p, "**:");

	if (tm.tm_min <= 59)
		p += sprintf(p, "%02d:", tm.tm_min);
	else
		p += sprintf(p, "**:");

	if (tm.tm_sec <= 59)
		p += sprintf(p, "%02d\n", tm.tm_sec);
	else
		p += sprintf(p, "**\n");

	p += sprintf(p,
		     "DST_enable\t: %s\n"
		     "BCD\t\t: %s\n"
		     "24hr\t\t: %s\n"
		     "square_wave\t: %s\n"
		     "alarm_IRQ\t: %s\n"
		     "update_IRQ\t: %s\n"
		     "periodic_IRQ\t: %s\n"
		     "periodic_freq\t: %ld\n"
		     "batt_status\t: %s\n",
		     (flags & RTC_DST_EN) ? "yes" : "no",
		     (flags & RTC_DM_BINARY) ? "no" : "yes",
		     (flags & RTC_24H) ? "yes" : "no",
		     (flags & RTC_SQWE) ? "yes" : "no",
		     (flags & RTC_AIE) ? "yes" : "no",
		     irq_active ? "yes" : "no",
		     (flags & RTC_PIE) ? "yes" : "no",
		     0L /* freq */,
		     (flags & RTC_BATT_BAD) ? "bad" : "okay");
	if (!get_rtc_pll(&pll))
	    p += sprintf(p,
			 "PLL adjustment\t: %d\n"
			 "PLL max +ve adjustment\t: %d\n"
			 "PLL max -ve adjustment\t: %d\n"
			 "PLL +ve adjustment factor\t: %d\n"
			 "PLL -ve adjustment factor\t: %d\n"
			 "PLL frequency\t: %ld\n",
			 pll.pll_value,
			 pll.pll_max,
			 pll.pll_min,
			 pll.pll_posmult,
			 pll.pll_negmult,
			 pll.pll_clock);
	return p - buf;
}

static int gen_rtc_read_proc(char *page, char **start, off_t off,
			     int count, int *eof, void *data)
{
	int len = gen_rtc_proc_output (page);
        if (len <= off+count) *eof = 1;
	*start = page + off;
	len -= off;
        if (len>count) len = count;
        if (len<0) len = 0;
	return len;
}

static int __init gen_rtc_proc_init(void)
{
	struct proc_dir_entry *r;

	r = create_proc_read_entry("driver/rtc", 0, NULL, gen_rtc_read_proc, NULL);
	if (!r)
		return -ENOMEM;
	return 0;
}
#else
static inline int gen_rtc_proc_init(void) { return 0; }
#endif /* CONFIG_PROC_FS */


/*
 *	The various file operations we support.
 */

static const struct file_operations gen_rtc_fops = {
	.owner		= THIS_MODULE,
#ifdef CONFIG_GEN_RTC_X
	.read		= gen_rtc_read,
	.poll		= gen_rtc_poll,
#endif
	.ioctl		= gen_rtc_ioctl,
	.open		= gen_rtc_open,
	.release	= gen_rtc_release,
};

static struct miscdevice rtc_gen_dev =
{
	.minor		= RTC_MINOR,
	.name		= "rtc",
	.fops		= &gen_rtc_fops,
};

static int __init rtc_generic_init(void)
{
	int retval;

	printk(KERN_INFO "Generic RTC Driver v%s\n", RTC_VERSION);

	retval = misc_register(&rtc_gen_dev);
	if (retval < 0)
		return retval;

	retval = gen_rtc_proc_init();
	if (retval) {
		misc_deregister(&rtc_gen_dev);
		return retval;
	}

	return 0;
}

static void __exit rtc_generic_exit(void)
{
	remove_proc_entry ("driver/rtc", NULL);
	misc_deregister(&rtc_gen_dev);
}


module_init(rtc_generic_init);
module_exit(rtc_generic_exit);

MODULE_AUTHOR("Richard Zidlicky");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(RTC_MINOR);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Real Time Clock interface for
	3	* - q40 and other m68k machines,
	4	* - HP PARISC machines
	5	* - PowerPC machines
	6	* emulate some RTC irq capabilities in software
	7	*
	8	* Copyright (C) 1999 Richard Zidlicky
	9	*
	10	* based on Paul Gortmaker's rtc.c device and
	11	* Sam Creasey Generic rtc driver
	12	*
	13	* This driver allows use of the real time clock (built into
	14	* nearly all computers) from user space. It exports the /dev/rtc
c685ce05	15	* interface supporting various ioctl() and also the /proc/driver/rtc
1da177e4 LT	16	* pseudo-file for status information.
	17	*
	18	* The ioctls can be used to set the interrupt behaviour where
	19	* supported.
	20	*
	21	* The /dev/rtc interface will block on reads until an interrupt
	22	* has been received. If a RTC interrupt has already happened,
	23	* it will output an unsigned long and then block. The output value
	24	* contains the interrupt status in the low byte and the number of
	25	* interrupts since the last read in the remaining high bytes. The
	26	* /dev/rtc interface can also be used with the select(2) call.
	27	*
	28	* This program is free software; you can redistribute it and/or
	29	* modify it under the terms of the GNU General Public License
	30	* as published by the Free Software Foundation; either version
	31	* 2 of the License, or (at your option) any later version.
	32	*
	33
	34	* 1.01 fix for 2.3.X rz@linux-m68k.org
	35	* 1.02 merged with code from genrtc.c rz@linux-m68k.org
	36	* 1.03 make it more portable zippel@linux-m68k.org
	37	* 1.04 removed useless timer code rz@linux-m68k.org
	38	* 1.05 portable RTC_UIE emulation rz@linux-m68k.org
	39	* 1.06 set_rtc_time can return an error trini@kernel.crashing.org
	40	* 1.07 ported to HP PARISC (hppa) Helge Deller <deller@gmx.de>
	41	*/
	42
	43	#define RTC_VERSION "1.07"
	44
	45	#include <linux/module.h>
1da177e4 LT	46	#include <linux/errno.h>
	47	#include <linux/miscdevice.h>
	48	#include <linux/fcntl.h>
	49
	50	#include <linux/rtc.h>
	51	#include <linux/init.h>
	52	#include <linux/poll.h>
	53	#include <linux/proc_fs.h>
742a2fe3	54	#include <linux/smp_lock.h>
1da177e4 LT	55	#include <linux/workqueue.h>
	56
	57	#include <asm/uaccess.h>
	58	#include <asm/system.h>
	59	#include <asm/rtc.h>
	60
	61	/*
	62	* We sponge a minor off of the misc major. No need slurping
	63	* up another valuable major dev number for this. If you add
	64	* an ioctl, make sure you don't conflict with SPARC's RTC
	65	* ioctls.
	66	*/
	67
	68	static DECLARE_WAIT_QUEUE_HEAD(gen_rtc_wait);
	69
	70	/*
	71	* Bits in gen_rtc_status.
	72	*/
	73
	74	#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
	75
	76	static unsigned char gen_rtc_status; /* bitmapped status byte. */
	77	static unsigned long gen_rtc_irq_data; /* our output to the world */
	78
	79	/* months start at 0 now */
	80	static unsigned char days_in_mo[] =
	81	{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	82
	83	static int irq_active;
	84
	85	#ifdef CONFIG_GEN_RTC_X
	86	static struct work_struct genrtc_task;
	87	static struct timer_list timer_task;
	88
	89	static unsigned int oldsecs;
	90	static int lostint;
	91	static unsigned long tt_exp;
	92
	93	static void gen_rtc_timer(unsigned long data);
	94
	95	static volatile int stask_active; /* schedule_work */
	96	static volatile int ttask_active; /* timer_task */
	97	static int stop_rtc_timers; /* don't requeue tasks */
	98	static DEFINE_SPINLOCK(gen_rtc_lock);
	99
	100	static void gen_rtc_interrupt(unsigned long arg);
	101
	102	/*
	103	* Routine to poll RTC seconds field for change as often as possible,
	104	* after first RTC_UIE use timer to reduce polling
	105	*/
c4028958	106	static void genrtc_troutine(struct work_struct *work)
1da177e4 LT	107	{
	108	unsigned int tmp = get_rtc_ss();
	109
	110	if (stop_rtc_timers) {
	111	stask_active = 0;
	112	return;
	113	}
	114
	115	if (oldsecs != tmp){
	116	oldsecs = tmp;
	117
	118	timer_task.function = gen_rtc_timer;
	119	timer_task.expires = jiffies + HZ - (HZ/10);
	120	tt_exp=timer_task.expires;
	121	ttask_active=1;
	122	stask_active=0;
	123	add_timer(&timer_task);
	124
	125	gen_rtc_interrupt(0);
	126	} else if (schedule_work(&genrtc_task) == 0)
	127	stask_active = 0;
	128	}
	129
	130	static void gen_rtc_timer(unsigned long data)
	131	{
	132	lostint = get_rtc_ss() - oldsecs ;
	133	if (lostint<0)
	134	lostint = 60 - lostint;
	135	if (time_after(jiffies, tt_exp))
	136	printk(KERN_INFO "genrtc: timer task delayed by %ld jiffies\n",
	137	jiffies-tt_exp);
	138	ttask_active=0;
	139	stask_active=1;
	140	if ((schedule_work(&genrtc_task) == 0))
	141	stask_active = 0;
	142	}
	143
	144	/*
	145	* call gen_rtc_interrupt function to signal an RTC_UIE,
	146	* arg is unused.
	147	* Could be invoked either from a real interrupt handler or
	148	* from some routine that periodically (eg 100HZ) monitors
	149	* whether RTC_SECS changed
	150	*/
	151	static void gen_rtc_interrupt(unsigned long arg)
	152	{
	153	/* We store the status in the low byte and the number of
	154	* interrupts received since the last read in the remainder
	155	* of rtc_irq_data. */
	156
	157	gen_rtc_irq_data += 0x100;
	158	gen_rtc_irq_data &= ~0xff;
	159	gen_rtc_irq_data \|= RTC_UIE;
	160
	161	if (lostint){
	162	printk("genrtc: system delaying clock ticks?\n");
	163	/* increment count so that userspace knows something is wrong */
	164	gen_rtc_irq_data += ((lostint-1)<<8);
	165	lostint = 0;
	166	}
	167
	168	wake_up_interruptible(&gen_rtc_wait);
	169	}
	170
171	/*
172	* Now all the various file operations that we export.
173	*/
174	static ssize_t gen_rtc_read(struct file file, char __user buf,
175	size_t count, loff_t *ppos)
176	{
1da177e4 LT	177	unsigned long data;
	178	ssize_t retval;
	179
	180	if (count != sizeof (unsigned int) && count != sizeof (unsigned long))
	181	return -EINVAL;
	182
	183	if (file->f_flags & O_NONBLOCK && !gen_rtc_irq_data)
	184	return -EAGAIN;
	185
e0955e14 JS	186	retval = wait_event_interruptible(gen_rtc_wait,
	187	(data = xchg(&gen_rtc_irq_data, 0)));
	188	if (retval)
	189	goto out;
1da177e4 LT	190
	191	/* first test allows optimizer to nuke this case for 32-bit machines */
	192	if (sizeof (int) != sizeof (long) && count == sizeof (unsigned int)) {
	193	unsigned int uidata = data;
f3537ea7 AN	194	retval = put_user(uidata, (unsigned int __user *)buf) ?:
f3537ea7 AN	195	sizeof(unsigned int);
1da177e4 LT	196	}
1da177e4 LT	197	else {
f3537ea7 AN	198	retval = put_user(data, (unsigned long __user *)buf) ?:
f3537ea7 AN	199	sizeof(unsigned long);
1da177e4	200	}
e0955e14	201	out:
1da177e4 LT	202	return retval;
	203	}
	204
	205	static unsigned int gen_rtc_poll(struct file *file,
	206	struct poll_table_struct *wait)
	207	{
	208	poll_wait(file, &gen_rtc_wait, wait);
	209	if (gen_rtc_irq_data != 0)
	210	return POLLIN \| POLLRDNORM;
	211	return 0;
	212	}
	213
	214	#endif
	215
	216	/*
	217	* Used to disable/enable interrupts, only RTC_UIE supported
	218	* We also clear out any old irq data after an ioctl() that
	219	* meddles with the interrupt enable/disable bits.
	220	*/
	221
	222	static inline void gen_clear_rtc_irq_bit(unsigned char bit)
	223	{
	224	#ifdef CONFIG_GEN_RTC_X
	225	stop_rtc_timers = 1;
	226	if (ttask_active){
	227	del_timer_sync(&timer_task);
	228	ttask_active = 0;
	229	}
	230	while (stask_active)
	231	schedule();
	232
	233	spin_lock(&gen_rtc_lock);
	234	irq_active = 0;
	235	spin_unlock(&gen_rtc_lock);
	236	#endif
	237	}
	238
	239	static inline int gen_set_rtc_irq_bit(unsigned char bit)
	240	{
	241	#ifdef CONFIG_GEN_RTC_X
	242	spin_lock(&gen_rtc_lock);
	243	if ( !irq_active ) {
	244	irq_active = 1;
	245	stop_rtc_timers = 0;
	246	lostint = 0;
c4028958	247	INIT_WORK(&genrtc_task, genrtc_troutine);
1da177e4 LT	248	oldsecs = get_rtc_ss();
	249	init_timer(&timer_task);
	250
	251	stask_active = 1;
	252	if (schedule_work(&genrtc_task) == 0){
	253	stask_active = 0;
	254	}
	255	}
	256	spin_unlock(&gen_rtc_lock);
	257	gen_rtc_irq_data = 0;
	258	return 0;
	259	#else
	260	return -EINVAL;
	261	#endif
	262	}
	263
	264	static int gen_rtc_ioctl(struct inode inode, struct file file,
	265	unsigned int cmd, unsigned long arg)
	266	{
	267	struct rtc_time wtime;
	268	struct rtc_pll_info pll;
	269	void __user argp = (void __user )arg;
	270
	271	switch (cmd) {
	272
	273	case RTC_PLL_GET:
	274	if (get_rtc_pll(&pll))
	275	return -EINVAL;
	276	else
	277	return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
	278
	279	case RTC_PLL_SET:
	280	if (!capable(CAP_SYS_TIME))
	281	return -EACCES;
	282	if (copy_from_user(&pll, argp, sizeof(pll)))
	283	return -EFAULT;
	284	return set_rtc_pll(&pll);
	285
	286	case RTC_UIE_OFF: /* disable ints from RTC updates. */
	287	gen_clear_rtc_irq_bit(RTC_UIE);
	288	return 0;
	289
	290	case RTC_UIE_ON: /* enable ints for RTC updates. */
	291	return gen_set_rtc_irq_bit(RTC_UIE);
	292
	293	case RTC_RD_TIME: /* Read the time/date from RTC */
	294	/* this doesn't get week-day, who cares */
	295	memset(&wtime, 0, sizeof(wtime));
	296	get_rtc_time(&wtime);
	297
	298	return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
	299
	300	case RTC_SET_TIME: /* Set the RTC */
	301	{
	302	int year;
	303	unsigned char leap_yr;
	304
	305	if (!capable(CAP_SYS_TIME))
	306	return -EACCES;
	307
	308	if (copy_from_user(&wtime, argp, sizeof(wtime)))
	309	return -EFAULT;
	310
	311	year = wtime.tm_year + 1900;
312	leap_yr = ((!(year % 4) && (year % 100)) \|\|
313	!(year % 400));
314
315	if ((wtime.tm_mon < 0 \|\| wtime.tm_mon > 11) \|\| (wtime.tm_mday < 1))
316	return -EINVAL;
317
318	if (wtime.tm_mday < 0 \|\| wtime.tm_mday >
319	(days_in_mo[wtime.tm_mon] + ((wtime.tm_mon == 1) && leap_yr)))
320	return -EINVAL;
321
322	if (wtime.tm_hour < 0 \|\| wtime.tm_hour >= 24 \|\|
323	wtime.tm_min < 0 \|\| wtime.tm_min >= 60 \|\|
324	wtime.tm_sec < 0 \|\| wtime.tm_sec >= 60)
325	return -EINVAL;
326
327	return set_rtc_time(&wtime);
328	}
329	}
330
331	return -EINVAL;
332	}
333
334	/*
335	* We enforce only one user at a time here with the open/close.
336	* Also clear the previous interrupt data on an open, and clean
337	* up things on a close.
338	*/
339
340	static int gen_rtc_open(struct inode inode, struct file file)
341	{
742a2fe3 AB	342	lock_kernel();
	343	if (gen_rtc_status & RTC_IS_OPEN) {
	344	unlock_kernel();
1da177e4	345	return -EBUSY;
742a2fe3	346	}
1da177e4 LT	347
	348	gen_rtc_status \|= RTC_IS_OPEN;
	349	gen_rtc_irq_data = 0;
	350	irq_active = 0;
742a2fe3	351	unlock_kernel();
1da177e4 LT	352
	353	return 0;
	354	}
	355
	356	static int gen_rtc_release(struct inode inode, struct file file)
	357	{
	358	/*
	359	* Turn off all interrupts once the device is no longer
	360	* in use and clear the data.
	361	*/
	362
	363	gen_clear_rtc_irq_bit(RTC_PIE\|RTC_AIE\|RTC_UIE);
	364
	365	gen_rtc_status &= ~RTC_IS_OPEN;
	366	return 0;
	367	}
	368
	369
	370	#ifdef CONFIG_PROC_FS
	371
	372	/*
c685ce05	373	* Info exported via "/proc/driver/rtc".
1da177e4 LT	374	*/
	375
	376	static int gen_rtc_proc_output(char *buf)
	377	{
	378	char *p;
	379	struct rtc_time tm;
	380	unsigned int flags;
	381	struct rtc_pll_info pll;
	382
	383	p = buf;
	384
	385	flags = get_rtc_time(&tm);
	386
	387	p += sprintf(p,
	388	"rtc_time\t: %02d:%02d:%02d\n"
	389	"rtc_date\t: %04d-%02d-%02d\n"
	390	"rtc_epoch\t: %04u\n",
	391	tm.tm_hour, tm.tm_min, tm.tm_sec,
	392	tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 1900);
	393
	394	tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
	395
	396	p += sprintf(p, "alarm\t\t: ");
	397	if (tm.tm_hour <= 24)
	398	p += sprintf(p, "%02d:", tm.tm_hour);
	399	else
	400	p += sprintf(p, "**:");
	401
	402	if (tm.tm_min <= 59)
	403	p += sprintf(p, "%02d:", tm.tm_min);
	404	else
	405	p += sprintf(p, "**:");
	406
	407	if (tm.tm_sec <= 59)
	408	p += sprintf(p, "%02d\n", tm.tm_sec);
	409	else
	410	p += sprintf(p, "**\n");
	411
	412	p += sprintf(p,
	413	"DST_enable\t: %s\n"
	414	"BCD\t\t: %s\n"
	415	"24hr\t\t: %s\n"
	416	"square_wave\t: %s\n"
	417	"alarm_IRQ\t: %s\n"
	418	"update_IRQ\t: %s\n"
	419	"periodic_IRQ\t: %s\n"
	420	"periodic_freq\t: %ld\n"
	421	"batt_status\t: %s\n",
	422	(flags & RTC_DST_EN) ? "yes" : "no",
	423	(flags & RTC_DM_BINARY) ? "no" : "yes",
	424	(flags & RTC_24H) ? "yes" : "no",
	425	(flags & RTC_SQWE) ? "yes" : "no",
	426	(flags & RTC_AIE) ? "yes" : "no",
	427	irq_active ? "yes" : "no",
	428	(flags & RTC_PIE) ? "yes" : "no",
	429	0L /* freq */,
	430	(flags & RTC_BATT_BAD) ? "bad" : "okay");
	431	if (!get_rtc_pll(&pll))
	432	p += sprintf(p,
	433	"PLL adjustment\t: %d\n"
	434	"PLL max +ve adjustment\t: %d\n"
	435	"PLL max -ve adjustment\t: %d\n"
	436	"PLL +ve adjustment factor\t: %d\n"
	437	"PLL -ve adjustment factor\t: %d\n"
438	"PLL frequency\t: %ld\n",
439	pll.pll_value,
440	pll.pll_max,
441	pll.pll_min,
442	pll.pll_posmult,
443	pll.pll_negmult,
444	pll.pll_clock);
445	return p - buf;
446	}
447
448	static int gen_rtc_read_proc(char page, char *start, off_t off,
449	int count, int eof, void data)
450	{
451	int len = gen_rtc_proc_output (page);
452	if (len <= off+count) *eof = 1;
453	*start = page + off;
454	len -= off;
455	if (len>count) len = count;
456	if (len<0) len = 0;
457	return len;
458	}
459
460	static int __init gen_rtc_proc_init(void)
461	{
462	struct proc_dir_entry *r;
463
464	r = create_proc_read_entry("driver/rtc", 0, NULL, gen_rtc_read_proc, NULL);
465	if (!r)
466	return -ENOMEM;
467	return 0;
468	}
469	#else
470	static inline int gen_rtc_proc_init(void) { return 0; }
471	#endif /* CONFIG_PROC_FS */
472
473
474	/*
475	* The various file operations we support.
476	*/
477
62322d25	478	static const struct file_operations gen_rtc_fops = {
1da177e4 LT	479	.owner = THIS_MODULE,
	480	#ifdef CONFIG_GEN_RTC_X
	481	.read = gen_rtc_read,
	482	.poll = gen_rtc_poll,
	483	#endif
	484	.ioctl = gen_rtc_ioctl,
	485	.open = gen_rtc_open,
	486	.release = gen_rtc_release,
	487	};
	488
	489	static struct miscdevice rtc_gen_dev =
	490	{
	491	.minor = RTC_MINOR,
	492	.name = "rtc",
	493	.fops = &gen_rtc_fops,
	494	};
	495
	496	static int __init rtc_generic_init(void)
	497	{
	498	int retval;
	499
	500	printk(KERN_INFO "Generic RTC Driver v%s\n", RTC_VERSION);
	501
	502	retval = misc_register(&rtc_gen_dev);
	503	if (retval < 0)
	504	return retval;
	505
	506	retval = gen_rtc_proc_init();
	507	if (retval) {
	508	misc_deregister(&rtc_gen_dev);
	509	return retval;
	510	}
	511
	512	return 0;
	513	}
	514
	515	static void __exit rtc_generic_exit(void)
	516	{
	517	remove_proc_entry ("driver/rtc", NULL);
	518	misc_deregister(&rtc_gen_dev);
	519	}
	520
	521
	522	module_init(rtc_generic_init);
	523	module_exit(rtc_generic_exit);
	524
	525	MODULE_AUTHOR("Richard Zidlicky");
	526	MODULE_LICENSE("GPL");
	527	MODULE_ALIAS_MISCDEV(RTC_MINOR);