[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/sched.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>
86ae13b0	46	#include <linux/sched.h>
1da177e4 LT	47	#include <linux/errno.h>
	48	#include <linux/miscdevice.h>
	49	#include <linux/fcntl.h>
	50
	51	#include <linux/rtc.h>
	52	#include <linux/init.h>
	53	#include <linux/poll.h>
	54	#include <linux/proc_fs.h>
742a2fe3	55	#include <linux/smp_lock.h>
1da177e4 LT	56	#include <linux/workqueue.h>
	57
	58	#include <asm/uaccess.h>
	59	#include <asm/system.h>
	60	#include <asm/rtc.h>
	61
	62	/*
	63	* We sponge a minor off of the misc major. No need slurping
	64	* up another valuable major dev number for this. If you add
	65	* an ioctl, make sure you don't conflict with SPARC's RTC
	66	* ioctls.
	67	*/
	68
	69	static DECLARE_WAIT_QUEUE_HEAD(gen_rtc_wait);
	70
	71	/*
	72	* Bits in gen_rtc_status.
	73	*/
	74
	75	#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
	76
	77	static unsigned char gen_rtc_status; /* bitmapped status byte. */
	78	static unsigned long gen_rtc_irq_data; /* our output to the world */
	79
	80	/* months start at 0 now */
	81	static unsigned char days_in_mo[] =
	82	{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	83
	84	static int irq_active;
	85
	86	#ifdef CONFIG_GEN_RTC_X
	87	static struct work_struct genrtc_task;
	88	static struct timer_list timer_task;
	89
	90	static unsigned int oldsecs;
	91	static int lostint;
	92	static unsigned long tt_exp;
	93
	94	static void gen_rtc_timer(unsigned long data);
	95
	96	static volatile int stask_active; /* schedule_work */
	97	static volatile int ttask_active; /* timer_task */
	98	static int stop_rtc_timers; /* don't requeue tasks */
	99	static DEFINE_SPINLOCK(gen_rtc_lock);
	100
	101	static void gen_rtc_interrupt(unsigned long arg);
	102
	103	/*
	104	* Routine to poll RTC seconds field for change as often as possible,
	105	* after first RTC_UIE use timer to reduce polling
	106	*/
c4028958	107	static void genrtc_troutine(struct work_struct *work)
1da177e4 LT	108	{
	109	unsigned int tmp = get_rtc_ss();
	110
	111	if (stop_rtc_timers) {
	112	stask_active = 0;
	113	return;
	114	}
	115
	116	if (oldsecs != tmp){
	117	oldsecs = tmp;
	118
	119	timer_task.function = gen_rtc_timer;
	120	timer_task.expires = jiffies + HZ - (HZ/10);
	121	tt_exp=timer_task.expires;
	122	ttask_active=1;
	123	stask_active=0;
	124	add_timer(&timer_task);
	125
	126	gen_rtc_interrupt(0);
	127	} else if (schedule_work(&genrtc_task) == 0)
	128	stask_active = 0;
	129	}
	130
	131	static void gen_rtc_timer(unsigned long data)
	132	{
	133	lostint = get_rtc_ss() - oldsecs ;
	134	if (lostint<0)
	135	lostint = 60 - lostint;
	136	if (time_after(jiffies, tt_exp))
	137	printk(KERN_INFO "genrtc: timer task delayed by %ld jiffies\n",
	138	jiffies-tt_exp);
	139	ttask_active=0;
	140	stask_active=1;
	141	if ((schedule_work(&genrtc_task) == 0))
	142	stask_active = 0;
	143	}
	144
	145	/*
	146	* call gen_rtc_interrupt function to signal an RTC_UIE,
	147	* arg is unused.
	148	* Could be invoked either from a real interrupt handler or
	149	* from some routine that periodically (eg 100HZ) monitors
	150	* whether RTC_SECS changed
	151	*/
	152	static void gen_rtc_interrupt(unsigned long arg)
	153	{
	154	/* We store the status in the low byte and the number of
	155	* interrupts received since the last read in the remainder
	156	* of rtc_irq_data. */
	157
	158	gen_rtc_irq_data += 0x100;
	159	gen_rtc_irq_data &= ~0xff;
	160	gen_rtc_irq_data \|= RTC_UIE;
	161
	162	if (lostint){
	163	printk("genrtc: system delaying clock ticks?\n");
	164	/* increment count so that userspace knows something is wrong */
	165	gen_rtc_irq_data += ((lostint-1)<<8);
	166	lostint = 0;
	167	}
	168
	169	wake_up_interruptible(&gen_rtc_wait);
	170	}
	171
172	/*
173	* Now all the various file operations that we export.
174	*/
175	static ssize_t gen_rtc_read(struct file file, char __user buf,
176	size_t count, loff_t *ppos)
177	{
1da177e4 LT	178	unsigned long data;
	179	ssize_t retval;
	180
	181	if (count != sizeof (unsigned int) && count != sizeof (unsigned long))
	182	return -EINVAL;
	183
	184	if (file->f_flags & O_NONBLOCK && !gen_rtc_irq_data)
	185	return -EAGAIN;
	186
e0955e14 JS	187	retval = wait_event_interruptible(gen_rtc_wait,
	188	(data = xchg(&gen_rtc_irq_data, 0)));
	189	if (retval)
	190	goto out;
1da177e4 LT	191
	192	/* first test allows optimizer to nuke this case for 32-bit machines */
	193	if (sizeof (int) != sizeof (long) && count == sizeof (unsigned int)) {
	194	unsigned int uidata = data;
f3537ea7 AN	195	retval = put_user(uidata, (unsigned int __user *)buf) ?:
f3537ea7 AN	196	sizeof(unsigned int);
1da177e4 LT	197	}
1da177e4 LT	198	else {
f3537ea7 AN	199	retval = put_user(data, (unsigned long __user *)buf) ?:
f3537ea7 AN	200	sizeof(unsigned long);
1da177e4	201	}
e0955e14	202	out:
1da177e4 LT	203	return retval;
	204	}
	205
	206	static unsigned int gen_rtc_poll(struct file *file,
	207	struct poll_table_struct *wait)
	208	{
	209	poll_wait(file, &gen_rtc_wait, wait);
	210	if (gen_rtc_irq_data != 0)
	211	return POLLIN \| POLLRDNORM;
	212	return 0;
	213	}
	214
	215	#endif
	216
	217	/*
	218	* Used to disable/enable interrupts, only RTC_UIE supported
	219	* We also clear out any old irq data after an ioctl() that
	220	* meddles with the interrupt enable/disable bits.
	221	*/
	222
	223	static inline void gen_clear_rtc_irq_bit(unsigned char bit)
	224	{
	225	#ifdef CONFIG_GEN_RTC_X
	226	stop_rtc_timers = 1;
	227	if (ttask_active){
	228	del_timer_sync(&timer_task);
	229	ttask_active = 0;
	230	}
	231	while (stask_active)
	232	schedule();
	233
	234	spin_lock(&gen_rtc_lock);
	235	irq_active = 0;
	236	spin_unlock(&gen_rtc_lock);
	237	#endif
	238	}
	239
	240	static inline int gen_set_rtc_irq_bit(unsigned char bit)
	241	{
	242	#ifdef CONFIG_GEN_RTC_X
	243	spin_lock(&gen_rtc_lock);
	244	if ( !irq_active ) {
	245	irq_active = 1;
	246	stop_rtc_timers = 0;
	247	lostint = 0;
c4028958	248	INIT_WORK(&genrtc_task, genrtc_troutine);
1da177e4 LT	249	oldsecs = get_rtc_ss();
	250	init_timer(&timer_task);
	251
	252	stask_active = 1;
	253	if (schedule_work(&genrtc_task) == 0){
	254	stask_active = 0;
	255	}
	256	}
	257	spin_unlock(&gen_rtc_lock);
	258	gen_rtc_irq_data = 0;
	259	return 0;
	260	#else
	261	return -EINVAL;
	262	#endif
	263	}
	264
	265	static int gen_rtc_ioctl(struct inode inode, struct file file,
	266	unsigned int cmd, unsigned long arg)
	267	{
	268	struct rtc_time wtime;
	269	struct rtc_pll_info pll;
	270	void __user argp = (void __user )arg;
	271
	272	switch (cmd) {
	273
	274	case RTC_PLL_GET:
	275	if (get_rtc_pll(&pll))
	276	return -EINVAL;
	277	else
	278	return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
	279
	280	case RTC_PLL_SET:
	281	if (!capable(CAP_SYS_TIME))
	282	return -EACCES;
	283	if (copy_from_user(&pll, argp, sizeof(pll)))
	284	return -EFAULT;
	285	return set_rtc_pll(&pll);
	286
	287	case RTC_UIE_OFF: /* disable ints from RTC updates. */
	288	gen_clear_rtc_irq_bit(RTC_UIE);
	289	return 0;
	290
	291	case RTC_UIE_ON: /* enable ints for RTC updates. */
	292	return gen_set_rtc_irq_bit(RTC_UIE);
	293
	294	case RTC_RD_TIME: /* Read the time/date from RTC */
	295	/* this doesn't get week-day, who cares */
	296	memset(&wtime, 0, sizeof(wtime));
	297	get_rtc_time(&wtime);
	298
	299	return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
	300
	301	case RTC_SET_TIME: /* Set the RTC */
	302	{
	303	int year;
	304	unsigned char leap_yr;
	305
	306	if (!capable(CAP_SYS_TIME))
	307	return -EACCES;
	308
	309	if (copy_from_user(&wtime, argp, sizeof(wtime)))
	310	return -EFAULT;
	311
	312	year = wtime.tm_year + 1900;
313	leap_yr = ((!(year % 4) && (year % 100)) \|\|
314	!(year % 400));
315
316	if ((wtime.tm_mon < 0 \|\| wtime.tm_mon > 11) \|\| (wtime.tm_mday < 1))
317	return -EINVAL;
318
319	if (wtime.tm_mday < 0 \|\| wtime.tm_mday >
320	(days_in_mo[wtime.tm_mon] + ((wtime.tm_mon == 1) && leap_yr)))
321	return -EINVAL;
322
323	if (wtime.tm_hour < 0 \|\| wtime.tm_hour >= 24 \|\|
324	wtime.tm_min < 0 \|\| wtime.tm_min >= 60 \|\|
325	wtime.tm_sec < 0 \|\| wtime.tm_sec >= 60)
326	return -EINVAL;
327
328	return set_rtc_time(&wtime);
329	}
330	}
331
332	return -EINVAL;
333	}
334
335	/*
336	* We enforce only one user at a time here with the open/close.
337	* Also clear the previous interrupt data on an open, and clean
338	* up things on a close.
339	*/
340
341	static int gen_rtc_open(struct inode inode, struct file file)
342	{
742a2fe3 AB	343	lock_kernel();
	344	if (gen_rtc_status & RTC_IS_OPEN) {
	345	unlock_kernel();
1da177e4	346	return -EBUSY;
742a2fe3	347	}
1da177e4 LT	348
	349	gen_rtc_status \|= RTC_IS_OPEN;
	350	gen_rtc_irq_data = 0;
	351	irq_active = 0;
742a2fe3	352	unlock_kernel();
1da177e4 LT	353
	354	return 0;
	355	}
	356
	357	static int gen_rtc_release(struct inode inode, struct file file)
	358	{
	359	/*
	360	* Turn off all interrupts once the device is no longer
	361	* in use and clear the data.
	362	*/
	363
	364	gen_clear_rtc_irq_bit(RTC_PIE\|RTC_AIE\|RTC_UIE);
	365
	366	gen_rtc_status &= ~RTC_IS_OPEN;
	367	return 0;
	368	}
	369
	370
	371	#ifdef CONFIG_PROC_FS
	372
	373	/*
c685ce05	374	* Info exported via "/proc/driver/rtc".
1da177e4 LT	375	*/
	376
	377	static int gen_rtc_proc_output(char *buf)
	378	{
	379	char *p;
	380	struct rtc_time tm;
	381	unsigned int flags;
	382	struct rtc_pll_info pll;
	383
	384	p = buf;
	385
	386	flags = get_rtc_time(&tm);
	387
	388	p += sprintf(p,
	389	"rtc_time\t: %02d:%02d:%02d\n"
	390	"rtc_date\t: %04d-%02d-%02d\n"
	391	"rtc_epoch\t: %04u\n",
	392	tm.tm_hour, tm.tm_min, tm.tm_sec,
	393	tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 1900);
	394
	395	tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
	396
	397	p += sprintf(p, "alarm\t\t: ");
	398	if (tm.tm_hour <= 24)
	399	p += sprintf(p, "%02d:", tm.tm_hour);
	400	else
	401	p += sprintf(p, "**:");
	402
	403	if (tm.tm_min <= 59)
	404	p += sprintf(p, "%02d:", tm.tm_min);
	405	else
	406	p += sprintf(p, "**:");
	407
	408	if (tm.tm_sec <= 59)
	409	p += sprintf(p, "%02d\n", tm.tm_sec);
	410	else
	411	p += sprintf(p, "**\n");
	412
	413	p += sprintf(p,
	414	"DST_enable\t: %s\n"
	415	"BCD\t\t: %s\n"
	416	"24hr\t\t: %s\n"
	417	"square_wave\t: %s\n"
	418	"alarm_IRQ\t: %s\n"
	419	"update_IRQ\t: %s\n"
	420	"periodic_IRQ\t: %s\n"
	421	"periodic_freq\t: %ld\n"
	422	"batt_status\t: %s\n",
	423	(flags & RTC_DST_EN) ? "yes" : "no",
	424	(flags & RTC_DM_BINARY) ? "no" : "yes",
	425	(flags & RTC_24H) ? "yes" : "no",
	426	(flags & RTC_SQWE) ? "yes" : "no",
	427	(flags & RTC_AIE) ? "yes" : "no",
	428	irq_active ? "yes" : "no",
	429	(flags & RTC_PIE) ? "yes" : "no",
	430	0L /* freq */,
	431	(flags & RTC_BATT_BAD) ? "bad" : "okay");
	432	if (!get_rtc_pll(&pll))
	433	p += sprintf(p,
	434	"PLL adjustment\t: %d\n"
	435	"PLL max +ve adjustment\t: %d\n"
	436	"PLL max -ve adjustment\t: %d\n"
	437	"PLL +ve adjustment factor\t: %d\n"
	438	"PLL -ve adjustment factor\t: %d\n"
439	"PLL frequency\t: %ld\n",
440	pll.pll_value,
441	pll.pll_max,
442	pll.pll_min,
443	pll.pll_posmult,
444	pll.pll_negmult,
445	pll.pll_clock);
446	return p - buf;
447	}
448
449	static int gen_rtc_read_proc(char page, char *start, off_t off,
450	int count, int eof, void data)
451	{
452	int len = gen_rtc_proc_output (page);
453	if (len <= off+count) *eof = 1;
454	*start = page + off;
455	len -= off;
456	if (len>count) len = count;
457	if (len<0) len = 0;
458	return len;
459	}
460
461	static int __init gen_rtc_proc_init(void)
462	{
463	struct proc_dir_entry *r;
464
465	r = create_proc_read_entry("driver/rtc", 0, NULL, gen_rtc_read_proc, NULL);
466	if (!r)
467	return -ENOMEM;
468	return 0;
469	}
470	#else
471	static inline int gen_rtc_proc_init(void) { return 0; }
472	#endif /* CONFIG_PROC_FS */
473
474
475	/*
476	* The various file operations we support.
477	*/
478
62322d25	479	static const struct file_operations gen_rtc_fops = {
1da177e4 LT	480	.owner = THIS_MODULE,
	481	#ifdef CONFIG_GEN_RTC_X
	482	.read = gen_rtc_read,
	483	.poll = gen_rtc_poll,
	484	#endif
	485	.ioctl = gen_rtc_ioctl,
	486	.open = gen_rtc_open,
	487	.release = gen_rtc_release,
	488	};
	489
	490	static struct miscdevice rtc_gen_dev =
	491	{
	492	.minor = RTC_MINOR,
	493	.name = "rtc",
	494	.fops = &gen_rtc_fops,
	495	};
	496
	497	static int __init rtc_generic_init(void)
	498	{
	499	int retval;
	500
	501	printk(KERN_INFO "Generic RTC Driver v%s\n", RTC_VERSION);
	502
	503	retval = misc_register(&rtc_gen_dev);
	504	if (retval < 0)
	505	return retval;
	506
	507	retval = gen_rtc_proc_init();
	508	if (retval) {
	509	misc_deregister(&rtc_gen_dev);
	510	return retval;
	511	}
	512
	513	return 0;
	514	}
	515
	516	static void __exit rtc_generic_exit(void)
	517	{
	518	remove_proc_entry ("driver/rtc", NULL);
	519	misc_deregister(&rtc_gen_dev);
	520	}
	521
	522
	523	module_init(rtc_generic_init);
	524	module_exit(rtc_generic_exit);
	525
	526	MODULE_AUTHOR("Richard Zidlicky");
	527	MODULE_LICENSE("GPL");
	528	MODULE_ALIAS_MISCDEV(RTC_MINOR);