[GitHub/mt8127/android_kernel_alcatel_ttab.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/seq_file.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>

#include <asm/uaccess.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 DEFINE_MUTEX(gen_rtc_mutex);
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 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;
}

static long gen_rtc_unlocked_ioctl(struct file *file, unsigned int cmd,
				   unsigned long arg)
{
	int ret;

	mutex_lock(&gen_rtc_mutex);
	ret = gen_rtc_ioctl(file, cmd, arg);
	mutex_unlock(&gen_rtc_mutex);

	return ret;
}

/*
 *	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)
{
	mutex_lock(&gen_rtc_mutex);
	if (gen_rtc_status & RTC_IS_OPEN) {
		mutex_unlock(&gen_rtc_mutex);
		return -EBUSY;
	}

	gen_rtc_status |= RTC_IS_OPEN;
	gen_rtc_irq_data = 0;
	irq_active = 0;
	mutex_unlock(&gen_rtc_mutex);

	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_show(struct seq_file *m, void *v)
{
	struct rtc_time tm;
	unsigned int flags;
	struct rtc_pll_info pll;

	flags = get_rtc_time(&tm);

	seq_printf(m,
		     "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;

	seq_puts(m, "alarm\t\t: ");
	if (tm.tm_hour <= 24)
		seq_printf(m, "%02d:", tm.tm_hour);
	else
		seq_puts(m, "**:");

	if (tm.tm_min <= 59)
		seq_printf(m, "%02d:", tm.tm_min);
	else
		seq_puts(m, "**:");

	if (tm.tm_sec <= 59)
		seq_printf(m, "%02d\n", tm.tm_sec);
	else
		seq_puts(m, "**\n");

	seq_printf(m,
		     "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))
	    seq_printf(m,
			 "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 0;
}

static int gen_rtc_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, gen_rtc_proc_show, NULL);
}

static const struct file_operations gen_rtc_proc_fops = {
	.open		= gen_rtc_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

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

	r = proc_create("driver/rtc", 0, NULL, &gen_rtc_proc_fops);
	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
	.unlocked_ioctl	= gen_rtc_unlocked_ioctl,
	.open		= gen_rtc_open,
	.release	= gen_rtc_release,
	.llseek		= noop_llseek,
};

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>
a6d935a5	55	#include <linux/seq_file.h>
613655fa	56	#include <linux/mutex.h>
1da177e4 LT	57	#include <linux/workqueue.h>
	58
	59	#include <asm/uaccess.h>
1da177e4 LT	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
613655fa	69	static DEFINE_MUTEX(gen_rtc_mutex);
1da177e4 LT	70	static DECLARE_WAIT_QUEUE_HEAD(gen_rtc_wait);
	71
	72	/*
	73	* Bits in gen_rtc_status.
	74	*/
	75
	76	#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
	77
	78	static unsigned char gen_rtc_status; /* bitmapped status byte. */
	79	static unsigned long gen_rtc_irq_data; /* our output to the world */
	80
	81	/* months start at 0 now */
	82	static unsigned char days_in_mo[] =
	83	{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	84
	85	static int irq_active;
	86
	87	#ifdef CONFIG_GEN_RTC_X
	88	static struct work_struct genrtc_task;
	89	static struct timer_list timer_task;
	90
	91	static unsigned int oldsecs;
	92	static int lostint;
	93	static unsigned long tt_exp;
	94
	95	static void gen_rtc_timer(unsigned long data);
	96
	97	static volatile int stask_active; /* schedule_work */
	98	static volatile int ttask_active; /* timer_task */
	99	static int stop_rtc_timers; /* don't requeue tasks */
	100	static DEFINE_SPINLOCK(gen_rtc_lock);
	101
	102	static void gen_rtc_interrupt(unsigned long arg);
	103
	104	/*
	105	* Routine to poll RTC seconds field for change as often as possible,
	106	* after first RTC_UIE use timer to reduce polling
	107	*/
c4028958	108	static void genrtc_troutine(struct work_struct *work)
1da177e4 LT	109	{
	110	unsigned int tmp = get_rtc_ss();
	111
	112	if (stop_rtc_timers) {
	113	stask_active = 0;
	114	return;
	115	}
	116
	117	if (oldsecs != tmp){
	118	oldsecs = tmp;
	119
	120	timer_task.function = gen_rtc_timer;
	121	timer_task.expires = jiffies + HZ - (HZ/10);
	122	tt_exp=timer_task.expires;
	123	ttask_active=1;
	124	stask_active=0;
	125	add_timer(&timer_task);
	126
	127	gen_rtc_interrupt(0);
	128	} else if (schedule_work(&genrtc_task) == 0)
	129	stask_active = 0;
	130	}
	131
	132	static void gen_rtc_timer(unsigned long data)
	133	{
	134	lostint = get_rtc_ss() - oldsecs ;
	135	if (lostint<0)
	136	lostint = 60 - lostint;
	137	if (time_after(jiffies, tt_exp))
	138	printk(KERN_INFO "genrtc: timer task delayed by %ld jiffies\n",
	139	jiffies-tt_exp);
	140	ttask_active=0;
	141	stask_active=1;
	142	if ((schedule_work(&genrtc_task) == 0))
	143	stask_active = 0;
	144	}
	145
	146	/*
	147	* call gen_rtc_interrupt function to signal an RTC_UIE,
	148	* arg is unused.
	149	* Could be invoked either from a real interrupt handler or
	150	* from some routine that periodically (eg 100HZ) monitors
	151	* whether RTC_SECS changed
	152	*/
	153	static void gen_rtc_interrupt(unsigned long arg)
	154	{
	155	/* We store the status in the low byte and the number of
	156	* interrupts received since the last read in the remainder
	157	* of rtc_irq_data. */
	158
	159	gen_rtc_irq_data += 0x100;
	160	gen_rtc_irq_data &= ~0xff;
	161	gen_rtc_irq_data \|= RTC_UIE;
	162
	163	if (lostint){
	164	printk("genrtc: system delaying clock ticks?\n");
	165	/* increment count so that userspace knows something is wrong */
	166	gen_rtc_irq_data += ((lostint-1)<<8);
	167	lostint = 0;
	168	}
	169
	170	wake_up_interruptible(&gen_rtc_wait);
	171	}
	172
173	/*
174	* Now all the various file operations that we export.
175	*/
176	static ssize_t gen_rtc_read(struct file file, char __user buf,
177	size_t count, loff_t *ppos)
178	{
1da177e4 LT	179	unsigned long data;
	180	ssize_t retval;
	181
	182	if (count != sizeof (unsigned int) && count != sizeof (unsigned long))
	183	return -EINVAL;
	184
	185	if (file->f_flags & O_NONBLOCK && !gen_rtc_irq_data)
	186	return -EAGAIN;
	187
e0955e14 JS	188	retval = wait_event_interruptible(gen_rtc_wait,
	189	(data = xchg(&gen_rtc_irq_data, 0)));
	190	if (retval)
	191	goto out;
1da177e4 LT	192
	193	/* first test allows optimizer to nuke this case for 32-bit machines */
	194	if (sizeof (int) != sizeof (long) && count == sizeof (unsigned int)) {
	195	unsigned int uidata = data;
f3537ea7 AN	196	retval = put_user(uidata, (unsigned int __user *)buf) ?:
f3537ea7 AN	197	sizeof(unsigned int);
1da177e4 LT	198	}
1da177e4 LT	199	else {
f3537ea7 AN	200	retval = put_user(data, (unsigned long __user *)buf) ?:
f3537ea7 AN	201	sizeof(unsigned long);
1da177e4	202	}
e0955e14	203	out:
1da177e4 LT	204	return retval;
	205	}
	206
	207	static unsigned int gen_rtc_poll(struct file *file,
	208	struct poll_table_struct *wait)
	209	{
	210	poll_wait(file, &gen_rtc_wait, wait);
	211	if (gen_rtc_irq_data != 0)
	212	return POLLIN \| POLLRDNORM;
	213	return 0;
	214	}
	215
	216	#endif
	217
	218	/*
	219	* Used to disable/enable interrupts, only RTC_UIE supported
	220	* We also clear out any old irq data after an ioctl() that
	221	* meddles with the interrupt enable/disable bits.
	222	*/
	223
	224	static inline void gen_clear_rtc_irq_bit(unsigned char bit)
	225	{
	226	#ifdef CONFIG_GEN_RTC_X
	227	stop_rtc_timers = 1;
	228	if (ttask_active){
	229	del_timer_sync(&timer_task);
	230	ttask_active = 0;
	231	}
	232	while (stask_active)
	233	schedule();
	234
	235	spin_lock(&gen_rtc_lock);
	236	irq_active = 0;
	237	spin_unlock(&gen_rtc_lock);
	238	#endif
	239	}
	240
	241	static inline int gen_set_rtc_irq_bit(unsigned char bit)
	242	{
	243	#ifdef CONFIG_GEN_RTC_X
	244	spin_lock(&gen_rtc_lock);
	245	if ( !irq_active ) {
	246	irq_active = 1;
	247	stop_rtc_timers = 0;
	248	lostint = 0;
c4028958	249	INIT_WORK(&genrtc_task, genrtc_troutine);
1da177e4 LT	250	oldsecs = get_rtc_ss();
	251	init_timer(&timer_task);
	252
	253	stask_active = 1;
	254	if (schedule_work(&genrtc_task) == 0){
	255	stask_active = 0;
	256	}
	257	}
	258	spin_unlock(&gen_rtc_lock);
	259	gen_rtc_irq_data = 0;
	260	return 0;
	261	#else
	262	return -EINVAL;
	263	#endif
	264	}
	265
55929332	266	static int gen_rtc_ioctl(struct file *file,
1da177e4 LT	267	unsigned int cmd, unsigned long arg)
	268	{
	269	struct rtc_time wtime;
	270	struct rtc_pll_info pll;
	271	void __user argp = (void __user )arg;
	272
	273	switch (cmd) {
	274
	275	case RTC_PLL_GET:
	276	if (get_rtc_pll(&pll))
	277	return -EINVAL;
	278	else
	279	return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
	280
	281	case RTC_PLL_SET:
	282	if (!capable(CAP_SYS_TIME))
	283	return -EACCES;
	284	if (copy_from_user(&pll, argp, sizeof(pll)))
	285	return -EFAULT;
	286	return set_rtc_pll(&pll);
	287
	288	case RTC_UIE_OFF: /* disable ints from RTC updates. */
	289	gen_clear_rtc_irq_bit(RTC_UIE);
	290	return 0;
	291
	292	case RTC_UIE_ON: /* enable ints for RTC updates. */
	293	return gen_set_rtc_irq_bit(RTC_UIE);
	294
	295	case RTC_RD_TIME: /* Read the time/date from RTC */
	296	/* this doesn't get week-day, who cares */
	297	memset(&wtime, 0, sizeof(wtime));
	298	get_rtc_time(&wtime);
	299
	300	return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0;
	301
	302	case RTC_SET_TIME: /* Set the RTC */
	303	{
	304	int year;
	305	unsigned char leap_yr;
	306
	307	if (!capable(CAP_SYS_TIME))
	308	return -EACCES;
	309
	310	if (copy_from_user(&wtime, argp, sizeof(wtime)))
	311	return -EFAULT;
	312
	313	year = wtime.tm_year + 1900;
	314	leap_yr = ((!(year % 4) && (year % 100)) \|\|
	315	!(year % 400));
	316
	317	if ((wtime.tm_mon < 0 \|\| wtime.tm_mon > 11) \|\| (wtime.tm_mday < 1))
	318	return -EINVAL;
	319
	320	if (wtime.tm_mday < 0 \|\| wtime.tm_mday >
	321	(days_in_mo[wtime.tm_mon] + ((wtime.tm_mon == 1) && leap_yr)))
	322	return -EINVAL;
	323
	324	if (wtime.tm_hour < 0 \|\| wtime.tm_hour >= 24 \|\|
	325	wtime.tm_min < 0 \|\| wtime.tm_min >= 60 \|\|
	326	wtime.tm_sec < 0 \|\| wtime.tm_sec >= 60)
	327	return -EINVAL;
	328
	329	return set_rtc_time(&wtime);
	330	}
331	}
332
333	return -EINVAL;
334	}
335
55929332 AB	336	static long gen_rtc_unlocked_ioctl(struct file *file, unsigned int cmd,
	337	unsigned long arg)
	338	{
	339	int ret;
	340
613655fa	341	mutex_lock(&gen_rtc_mutex);
55929332	342	ret = gen_rtc_ioctl(file, cmd, arg);
613655fa	343	mutex_unlock(&gen_rtc_mutex);
55929332 AB	344
	345	return ret;
	346	}
	347
1da177e4 LT	348	/*
	349	* We enforce only one user at a time here with the open/close.
	350	* Also clear the previous interrupt data on an open, and clean
	351	* up things on a close.
	352	*/
	353
	354	static int gen_rtc_open(struct inode inode, struct file file)
	355	{
613655fa	356	mutex_lock(&gen_rtc_mutex);
742a2fe3	357	if (gen_rtc_status & RTC_IS_OPEN) {
613655fa	358	mutex_unlock(&gen_rtc_mutex);
1da177e4	359	return -EBUSY;
742a2fe3	360	}
1da177e4 LT	361
	362	gen_rtc_status \|= RTC_IS_OPEN;
	363	gen_rtc_irq_data = 0;
	364	irq_active = 0;
613655fa	365	mutex_unlock(&gen_rtc_mutex);
1da177e4 LT	366
	367	return 0;
	368	}
	369
	370	static int gen_rtc_release(struct inode inode, struct file file)
	371	{
	372	/*
	373	* Turn off all interrupts once the device is no longer
	374	* in use and clear the data.
	375	*/
	376
	377	gen_clear_rtc_irq_bit(RTC_PIE\|RTC_AIE\|RTC_UIE);
	378
	379	gen_rtc_status &= ~RTC_IS_OPEN;
	380	return 0;
	381	}
	382
	383
	384	#ifdef CONFIG_PROC_FS
	385
	386	/*
c685ce05	387	* Info exported via "/proc/driver/rtc".
1da177e4 LT	388	*/
1da177e4 LT	389
a6d935a5	390	static int gen_rtc_proc_show(struct seq_file m, void v)
1da177e4	391	{
1da177e4 LT	392	struct rtc_time tm;
	393	unsigned int flags;
	394	struct rtc_pll_info pll;
	395
1da177e4 LT	396	flags = get_rtc_time(&tm);
1da177e4 LT	397
a6d935a5	398	seq_printf(m,
1da177e4 LT	399	"rtc_time\t: %02d:%02d:%02d\n"
	400	"rtc_date\t: %04d-%02d-%02d\n"
	401	"rtc_epoch\t: %04u\n",
	402	tm.tm_hour, tm.tm_min, tm.tm_sec,
	403	tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 1900);
	404
	405	tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
	406
a6d935a5	407	seq_puts(m, "alarm\t\t: ");
1da177e4	408	if (tm.tm_hour <= 24)
a6d935a5	409	seq_printf(m, "%02d:", tm.tm_hour);
1da177e4	410	else
a6d935a5	411	seq_puts(m, "**:");
1da177e4 LT	412
1da177e4 LT	413	if (tm.tm_min <= 59)
a6d935a5	414	seq_printf(m, "%02d:", tm.tm_min);
1da177e4	415	else
a6d935a5	416	seq_puts(m, "**:");
1da177e4 LT	417
1da177e4 LT	418	if (tm.tm_sec <= 59)
a6d935a5	419	seq_printf(m, "%02d\n", tm.tm_sec);
1da177e4	420	else
a6d935a5	421	seq_puts(m, "**\n");
1da177e4	422
a6d935a5	423	seq_printf(m,
1da177e4 LT	424	"DST_enable\t: %s\n"
	425	"BCD\t\t: %s\n"
	426	"24hr\t\t: %s\n"
	427	"square_wave\t: %s\n"
	428	"alarm_IRQ\t: %s\n"
	429	"update_IRQ\t: %s\n"
	430	"periodic_IRQ\t: %s\n"
	431	"periodic_freq\t: %ld\n"
	432	"batt_status\t: %s\n",
	433	(flags & RTC_DST_EN) ? "yes" : "no",
	434	(flags & RTC_DM_BINARY) ? "no" : "yes",
	435	(flags & RTC_24H) ? "yes" : "no",
	436	(flags & RTC_SQWE) ? "yes" : "no",
	437	(flags & RTC_AIE) ? "yes" : "no",
	438	irq_active ? "yes" : "no",
	439	(flags & RTC_PIE) ? "yes" : "no",
	440	0L /* freq */,
	441	(flags & RTC_BATT_BAD) ? "bad" : "okay");
	442	if (!get_rtc_pll(&pll))
a6d935a5	443	seq_printf(m,
1da177e4 LT	444	"PLL adjustment\t: %d\n"
	445	"PLL max +ve adjustment\t: %d\n"
	446	"PLL max -ve adjustment\t: %d\n"
	447	"PLL +ve adjustment factor\t: %d\n"
	448	"PLL -ve adjustment factor\t: %d\n"
	449	"PLL frequency\t: %ld\n",
	450	pll.pll_value,
	451	pll.pll_max,
	452	pll.pll_min,
	453	pll.pll_posmult,
	454	pll.pll_negmult,
	455	pll.pll_clock);
a6d935a5	456	return 0;
1da177e4 LT	457	}
1da177e4 LT	458
a6d935a5	459	static int gen_rtc_proc_open(struct inode inode, struct file file)
1da177e4	460	{
a6d935a5	461	return single_open(file, gen_rtc_proc_show, NULL);
1da177e4 LT	462	}
1da177e4 LT	463
a6d935a5 DH	464	static const struct file_operations gen_rtc_proc_fops = {
	465	.open = gen_rtc_proc_open,
	466	.read = seq_read,
	467	.llseek = seq_lseek,
2e7718cf	468	.release = single_release,
a6d935a5 DH	469	};
a6d935a5 DH	470
1da177e4 LT	471	static int __init gen_rtc_proc_init(void)
	472	{
	473	struct proc_dir_entry *r;
	474
a6d935a5	475	r = proc_create("driver/rtc", 0, NULL, &gen_rtc_proc_fops);
1da177e4 LT	476	if (!r)
	477	return -ENOMEM;
	478	return 0;
	479	}
	480	#else
	481	static inline int gen_rtc_proc_init(void) { return 0; }
	482	#endif /* CONFIG_PROC_FS */
	483
	484
	485	/*
	486	* The various file operations we support.
	487	*/
	488
62322d25	489	static const struct file_operations gen_rtc_fops = {
1da177e4 LT	490	.owner = THIS_MODULE,
	491	#ifdef CONFIG_GEN_RTC_X
	492	.read = gen_rtc_read,
	493	.poll = gen_rtc_poll,
	494	#endif
55929332	495	.unlocked_ioctl = gen_rtc_unlocked_ioctl,
1da177e4 LT	496	.open = gen_rtc_open,
1da177e4 LT	497	.release = gen_rtc_release,
6038f373	498	.llseek = noop_llseek,
1da177e4 LT	499	};
	500
	501	static struct miscdevice rtc_gen_dev =
	502	{
	503	.minor = RTC_MINOR,
	504	.name = "rtc",
	505	.fops = &gen_rtc_fops,
	506	};
	507
	508	static int __init rtc_generic_init(void)
	509	{
	510	int retval;
	511
	512	printk(KERN_INFO "Generic RTC Driver v%s\n", RTC_VERSION);
	513
	514	retval = misc_register(&rtc_gen_dev);
	515	if (retval < 0)
	516	return retval;
	517
	518	retval = gen_rtc_proc_init();
	519	if (retval) {
	520	misc_deregister(&rtc_gen_dev);
	521	return retval;
	522	}
	523
	524	return 0;
	525	}
	526
	527	static void __exit rtc_generic_exit(void)
	528	{
	529	remove_proc_entry ("driver/rtc", NULL);
	530	misc_deregister(&rtc_gen_dev);
	531	}
	532
	533
	534	module_init(rtc_generic_init);
	535	module_exit(rtc_generic_exit);
	536
	537	MODULE_AUTHOR("Richard Zidlicky");
	538	MODULE_LICENSE("GPL");
	539	MODULE_ALIAS_MISCDEV(RTC_MINOR);