drivers/input/misc/hp_sdc_rtc.c - kernel/msm - Gitiles

 /*
  * HP i8042 SDC + MSM-58321 BBRTC driver.
  *
  * Copyright (c) 2001 Brian S. Julin
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions, and the following disclaimer,
  *    without modification.
  * 2. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * Alternatively, this software may be distributed under the terms of the
  * GNU General Public License ("GPL").
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  *
  * References:
  * System Device Controller Microprocessor Firmware Theory of Operation
  *      for Part Number 1820-4784 Revision B.  Dwg No. A-1820-4784-2
  * efirtc.c by Stephane Eranian/Hewlett Packard
  *
  */

 #include <linux/hp_sdc.h>
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/time.h>
 #include <linux/miscdevice.h>
 #include <linux/proc_fs.h>
 #include <linux/poll.h>
 #include <linux/rtc.h>

 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
 MODULE_DESCRIPTION("HP i8042 SDC + MSM-58321 RTC Driver");
 MODULE_LICENSE("Dual BSD/GPL");

 #define RTC_VERSION "1.10d"

 static unsigned long epoch = 2000;

 static struct semaphore i8042tregs;

 static hp_sdc_irqhook hp_sdc_rtc_isr;

 static struct fasync_struct *hp_sdc_rtc_async_queue;

 static DECLARE_WAIT_QUEUE_HEAD(hp_sdc_rtc_wait);

 static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
 			       size_t count, loff_t *ppos);

 static int hp_sdc_rtc_ioctl(struct inode *inode, struct file *file,
 			    unsigned int cmd, unsigned long arg);

 static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait);

 static int hp_sdc_rtc_open(struct inode *inode, struct file *file);
 static int hp_sdc_rtc_release(struct inode *inode, struct file *file);
 static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on);

 static int hp_sdc_rtc_read_proc(char *page, char **start, off_t off,
 				int count, int *eof, void *data);

 static void hp_sdc_rtc_isr (int irq, void *dev_id,
 			    uint8_t status, uint8_t data)
 {
 	return;
 }

 static int hp_sdc_rtc_do_read_bbrtc (struct rtc_time *rtctm)
 {
 	struct semaphore tsem;
 	hp_sdc_transaction t;
 	uint8_t tseq[91];
 	int i;

 	i = 0;
 	while (i < 91) {
 		tseq[i++] = HP_SDC_ACT_DATAREG |
 			HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN;
 		tseq[i++] = 0x01;			/* write i8042[0x70] */
 	  	tseq[i]   = i / 7;			/* BBRTC reg address */
 		i++;
 		tseq[i++] = HP_SDC_CMD_DO_RTCR;		/* Trigger command   */
 		tseq[i++] = 2;		/* expect 1 stat/dat pair back.   */
 		i++; i++;               /* buffer for stat/dat pair       */
 	}
 	tseq[84] |= HP_SDC_ACT_SEMAPHORE;
 	t.endidx =		91;
 	t.seq =			tseq;
 	t.act.semaphore =	&tsem;
 	init_MUTEX_LOCKED(&tsem);

 	if (hp_sdc_enqueue_transaction(&t)) return -1;

 	down_interruptible(&tsem);  /* Put ourselves to sleep for results. */

 	/* Check for nonpresence of BBRTC */
 	if (!((tseq[83] | tseq[90] | tseq[69] | tseq[76] |
 	       tseq[55] | tseq[62] | tseq[34] | tseq[41] |
 	       tseq[20] | tseq[27] | tseq[6]  | tseq[13]) & 0x0f))
 		return -1;

 	memset(rtctm, 0, sizeof(struct rtc_time));
 	rtctm->tm_year = (tseq[83] & 0x0f) + (tseq[90] & 0x0f) * 10;
 	rtctm->tm_mon  = (tseq[69] & 0x0f) + (tseq[76] & 0x0f) * 10;
 	rtctm->tm_mday = (tseq[55] & 0x0f) + (tseq[62] & 0x0f) * 10;
 	rtctm->tm_wday = (tseq[48] & 0x0f);
 	rtctm->tm_hour = (tseq[34] & 0x0f) + (tseq[41] & 0x0f) * 10;
 	rtctm->tm_min  = (tseq[20] & 0x0f) + (tseq[27] & 0x0f) * 10;
 	rtctm->tm_sec  = (tseq[6]  & 0x0f) + (tseq[13] & 0x0f) * 10;

 	return 0;
 }

 static int hp_sdc_rtc_read_bbrtc (struct rtc_time *rtctm)
 {
 	struct rtc_time tm, tm_last;
 	int i = 0;

 	/* MSM-58321 has no read latch, so must read twice and compare. */

 	if (hp_sdc_rtc_do_read_bbrtc(&tm_last)) return -1;
 	if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;

 	while (memcmp(&tm, &tm_last, sizeof(struct rtc_time))) {
 		if (i++ > 4) return -1;
 		memcpy(&tm_last, &tm, sizeof(struct rtc_time));
 		if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;
 	}

 	memcpy(rtctm, &tm, sizeof(struct rtc_time));

 	return 0;
 }


 static int64_t hp_sdc_rtc_read_i8042timer (uint8_t loadcmd, int numreg)
 {
 	hp_sdc_transaction t;
 	uint8_t tseq[26] = {
 		HP_SDC_ACT_PRECMD | HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 		0,
 		HP_SDC_CMD_READ_T1, 2, 0, 0,
 		HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 		HP_SDC_CMD_READ_T2, 2, 0, 0,
 		HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 		HP_SDC_CMD_READ_T3, 2, 0, 0,
 		HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 		HP_SDC_CMD_READ_T4, 2, 0, 0,
 		HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 		HP_SDC_CMD_READ_T5, 2, 0, 0
 	};

 	t.endidx = numreg * 5;

 	tseq[1] = loadcmd;
 	tseq[t.endidx - 4] |= HP_SDC_ACT_SEMAPHORE; /* numreg assumed > 1 */

 	t.seq =			tseq;
 	t.act.semaphore =	&i8042tregs;

 	down_interruptible(&i8042tregs);  /* Sleep if output regs in use. */

 	if (hp_sdc_enqueue_transaction(&t)) return -1;

 	down_interruptible(&i8042tregs);  /* Sleep until results come back. */
 	up(&i8042tregs);

 	return (tseq[5] |
 		((uint64_t)(tseq[10]) << 8)  | ((uint64_t)(tseq[15]) << 16) |
 		((uint64_t)(tseq[20]) << 24) | ((uint64_t)(tseq[25]) << 32));
 }


 /* Read the i8042 real-time clock */
 static inline int hp_sdc_rtc_read_rt(struct timeval *res) {
 	int64_t raw;
 	uint32_t tenms;
 	unsigned int days;

 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_RT, 5);
 	if (raw < 0) return -1;

 	tenms = (uint32_t)raw & 0xffffff;
 	days  = (unsigned int)(raw >> 24) & 0xffff;

 	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 	res->tv_sec =  (time_t)(tenms / 100) + days * 86400;

 	return 0;
 }


 /* Read the i8042 fast handshake timer */
 static inline int hp_sdc_rtc_read_fhs(struct timeval *res) {
 	uint64_t raw;
 	unsigned int tenms;

 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_FHS, 2);
 	if (raw < 0) return -1;

 	tenms = (unsigned int)raw & 0xffff;

 	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 	res->tv_sec  = (time_t)(tenms / 100);

 	return 0;
 }


 /* Read the i8042 match timer (a.k.a. alarm) */
 static inline int hp_sdc_rtc_read_mt(struct timeval *res) {
 	int64_t raw;
 	uint32_t tenms;

 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_MT, 3);
 	if (raw < 0) return -1;

 	tenms = (uint32_t)raw & 0xffffff;

 	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 	res->tv_sec  = (time_t)(tenms / 100);

 	return 0;
 }


 /* Read the i8042 delay timer */
 static inline int hp_sdc_rtc_read_dt(struct timeval *res) {
 	int64_t raw;
 	uint32_t tenms;

 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_DT, 3);
 	if (raw < 0) return -1;

 	tenms = (uint32_t)raw & 0xffffff;

 	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 	res->tv_sec  = (time_t)(tenms / 100);

 	return 0;
 }


 /* Read the i8042 cycle timer (a.k.a. periodic) */
 static inline int hp_sdc_rtc_read_ct(struct timeval *res) {
 	int64_t raw;
 	uint32_t tenms;

 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_CT, 3);
 	if (raw < 0) return -1;

 	tenms = (uint32_t)raw & 0xffffff;

 	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 	res->tv_sec  = (time_t)(tenms / 100);

 	return 0;
 }


 /* Set the i8042 real-time clock */
 static int hp_sdc_rtc_set_rt (struct timeval *setto)
 {
 	uint32_t tenms;
 	unsigned int days;
 	hp_sdc_transaction t;
 	uint8_t tseq[11] = {
 		HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 		HP_SDC_CMD_SET_RTMS, 3, 0, 0, 0,
 		HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 		HP_SDC_CMD_SET_RTD, 2, 0, 0
 	};

 	t.endidx = 10;

 	if (0xffff < setto->tv_sec / 86400) return -1;
 	days = setto->tv_sec / 86400;
 	if (0xffff < setto->tv_usec / 1000000 / 86400) return -1;
 	days += ((setto->tv_sec % 86400) + setto->tv_usec / 1000000) / 86400;
 	if (days > 0xffff) return -1;

 	if (0xffffff < setto->tv_sec) return -1;
 	tenms  = setto->tv_sec * 100;
 	if (0xffffff < setto->tv_usec / 10000) return -1;
 	tenms += setto->tv_usec / 10000;
 	if (tenms > 0xffffff) return -1;

 	tseq[3] = (uint8_t)(tenms & 0xff);
 	tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 	tseq[5] = (uint8_t)((tenms >> 16) & 0xff);

 	tseq[9] = (uint8_t)(days & 0xff);
 	tseq[10] = (uint8_t)((days >> 8) & 0xff);

 	t.seq =	tseq;

 	if (hp_sdc_enqueue_transaction(&t)) return -1;
 	return 0;
 }

 /* Set the i8042 fast handshake timer */
 static int hp_sdc_rtc_set_fhs (struct timeval *setto)
 {
 	uint32_t tenms;
 	hp_sdc_transaction t;
 	uint8_t tseq[5] = {
 		HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 		HP_SDC_CMD_SET_FHS, 2, 0, 0
 	};

 	t.endidx = 4;

 	if (0xffff < setto->tv_sec) return -1;
 	tenms  = setto->tv_sec * 100;
 	if (0xffff < setto->tv_usec / 10000) return -1;
 	tenms += setto->tv_usec / 10000;
 	if (tenms > 0xffff) return -1;

 	tseq[3] = (uint8_t)(tenms & 0xff);
 	tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);

 	t.seq =	tseq;

 	if (hp_sdc_enqueue_transaction(&t)) return -1;
 	return 0;
 }


 /* Set the i8042 match timer (a.k.a. alarm) */
 #define hp_sdc_rtc_set_mt (setto) \
 	hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_MT)

 /* Set the i8042 delay timer */
 #define hp_sdc_rtc_set_dt (setto) \
 	hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_DT)

 /* Set the i8042 cycle timer (a.k.a. periodic) */
 #define hp_sdc_rtc_set_ct (setto) \
 	hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_CT)

 /* Set one of the i8042 3-byte wide timers */
 static int hp_sdc_rtc_set_i8042timer (struct timeval *setto, uint8_t setcmd)
 {
 	uint32_t tenms;
 	hp_sdc_transaction t;
 	uint8_t tseq[6] = {
 		HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 		0, 3, 0, 0, 0
 	};

 	t.endidx = 6;

 	if (0xffffff < setto->tv_sec) return -1;
 	tenms  = setto->tv_sec * 100;
 	if (0xffffff < setto->tv_usec / 10000) return -1;
 	tenms += setto->tv_usec / 10000;
 	if (tenms > 0xffffff) return -1;

 	tseq[1] = setcmd;
 	tseq[3] = (uint8_t)(tenms & 0xff);
 	tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 	tseq[5] = (uint8_t)((tenms >> 16)  & 0xff);

 	t.seq =			tseq;

 	if (hp_sdc_enqueue_transaction(&t)) {
 		return -1;
 	}
 	return 0;
 }

 static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
 			       size_t count, loff_t *ppos) {
 	ssize_t retval;

         if (count < sizeof(unsigned long))
                 return -EINVAL;

 	retval = put_user(68, (unsigned long __user *)buf);
 	return retval;
 }

 static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait)
 {
         unsigned long l;

 	l = 0;
         if (l != 0)
                 return POLLIN | POLLRDNORM;
         return 0;
 }

 static int hp_sdc_rtc_open(struct inode *inode, struct file *file)
 {
         return 0;
 }

 static int hp_sdc_rtc_release(struct inode *inode, struct file *file)
 {
 	/* Turn off interrupts? */

         if (file->f_flags & FASYNC) {
                 hp_sdc_rtc_fasync (-1, file, 0);
         }

         return 0;
 }

 static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on)
 {
         return fasync_helper (fd, filp, on, &hp_sdc_rtc_async_queue);
 }

 static int hp_sdc_rtc_proc_output (char *buf)
 {
 #define YN(bit) ("no")
 #define NY(bit) ("yes")
         char *p;
         struct rtc_time tm;
 	struct timeval tv;

 	memset(&tm, 0, sizeof(struct rtc_time));

 	p = buf;

 	if (hp_sdc_rtc_read_bbrtc(&tm)) {
 		p += sprintf(p, "BBRTC\t\t: READ FAILED!\n");
 	} else {
 		p += sprintf(p,
 			     "rtc_time\t: %02d:%02d:%02d\n"
 			     "rtc_date\t: %04d-%02d-%02d\n"
 			     "rtc_epoch\t: %04lu\n",
 			     tm.tm_hour, tm.tm_min, tm.tm_sec,
 			     tm.tm_year + 1900, tm.tm_mon + 1,
 			     tm.tm_mday, epoch);
 	}

 	if (hp_sdc_rtc_read_rt(&tv)) {
 		p += sprintf(p, "i8042 rtc\t: READ FAILED!\n");
 	} else {
 		p += sprintf(p, "i8042 rtc\t: %ld.%02d seconds\n",
 			     tv.tv_sec, tv.tv_usec/1000);
 	}

 	if (hp_sdc_rtc_read_fhs(&tv)) {
 		p += sprintf(p, "handshake\t: READ FAILED!\n");
 	} else {
         	p += sprintf(p, "handshake\t: %ld.%02d seconds\n",
 			     tv.tv_sec, tv.tv_usec/1000);
 	}

 	if (hp_sdc_rtc_read_mt(&tv)) {
 		p += sprintf(p, "alarm\t\t: READ FAILED!\n");
 	} else {
 		p += sprintf(p, "alarm\t\t: %ld.%02d seconds\n",
 			     tv.tv_sec, tv.tv_usec/1000);
 	}

 	if (hp_sdc_rtc_read_dt(&tv)) {
 		p += sprintf(p, "delay\t\t: READ FAILED!\n");
 	} else {
 		p += sprintf(p, "delay\t\t: %ld.%02d seconds\n",
 			     tv.tv_sec, tv.tv_usec/1000);
 	}

 	if (hp_sdc_rtc_read_ct(&tv)) {
 		p += sprintf(p, "periodic\t: READ FAILED!\n");
 	} else {
 		p += sprintf(p, "periodic\t: %ld.%02d seconds\n",
 			     tv.tv_sec, tv.tv_usec/1000);
 	}

         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",
                      YN(RTC_DST_EN),
                      NY(RTC_DM_BINARY),
                      YN(RTC_24H),
                      YN(RTC_SQWE),
                      YN(RTC_AIE),
                      YN(RTC_UIE),
                      YN(RTC_PIE),
                      1UL,
                      1 ? "okay" : "dead");

         return  p - buf;
 #undef YN
 #undef NY
 }

 static int hp_sdc_rtc_read_proc(char *page, char **start, off_t off,
                          int count, int *eof, void *data)
 {
 	int len = hp_sdc_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 hp_sdc_rtc_ioctl(struct inode *inode, struct file *file,
 			    unsigned int cmd, unsigned long arg)
 {
 #if 1
 	return -EINVAL;
 #else

         struct rtc_time wtime;
 	struct timeval ttime;
 	int use_wtime = 0;

 	/* This needs major work. */

         switch (cmd) {

         case RTC_AIE_OFF:       /* Mask alarm int. enab. bit    */
         case RTC_AIE_ON:        /* Allow alarm interrupts.      */
 	case RTC_PIE_OFF:       /* Mask periodic int. enab. bit */
         case RTC_PIE_ON:        /* Allow periodic ints          */
         case RTC_UIE_ON:        /* Allow ints for RTC updates.  */
         case RTC_UIE_OFF:       /* Allow ints for RTC updates.  */
         {
 		/* We cannot mask individual user timers and we
 		   cannot tell them apart when they occur, so it
 		   would be disingenuous to succeed these IOCTLs */
 		return -EINVAL;
         }
         case RTC_ALM_READ:      /* Read the present alarm time */
         {
 		if (hp_sdc_rtc_read_mt(&ttime)) return -EFAULT;
 		if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;

 		wtime.tm_hour = ttime.tv_sec / 3600;  ttime.tv_sec %= 3600;
 		wtime.tm_min  = ttime.tv_sec / 60;    ttime.tv_sec %= 60;
 		wtime.tm_sec  = ttime.tv_sec;

 		break;
         }
         case RTC_IRQP_READ:     /* Read the periodic IRQ rate.  */
         {
                 return put_user(hp_sdc_rtc_freq, (unsigned long *)arg);
         }
         case RTC_IRQP_SET:      /* Set periodic IRQ rate.       */
         {
                 /*
                  * The max we can do is 100Hz.
 		 */

                 if ((arg < 1) || (arg > 100)) return -EINVAL;
 		ttime.tv_sec = 0;
 		ttime.tv_usec = 1000000 / arg;
 		if (hp_sdc_rtc_set_ct(&ttime)) return -EFAULT;
 		hp_sdc_rtc_freq = arg;
                 return 0;
         }
         case RTC_ALM_SET:       /* Store a time into the alarm */
         {
                 /*
                  * This expects a struct hp_sdc_rtc_time. Writing 0xff means
                  * "don't care" or "match all" for PC timers.  The HP SDC
 		 * does not support that perk, but it could be emulated fairly
 		 * easily.  Only the tm_hour, tm_min and tm_sec are used.
 		 * We could do it with 10ms accuracy with the HP SDC, if the
 		 * rtc interface left us a way to do that.
                  */
                 struct hp_sdc_rtc_time alm_tm;

                 if (copy_from_user(&alm_tm, (struct hp_sdc_rtc_time*)arg,
                                    sizeof(struct hp_sdc_rtc_time)))
                        return -EFAULT;

                 if (alm_tm.tm_hour > 23) return -EINVAL;
 		if (alm_tm.tm_min  > 59) return -EINVAL;
 		if (alm_tm.tm_sec  > 59) return -EINVAL;

 		ttime.sec = alm_tm.tm_hour * 3600 +
 		  alm_tm.tm_min * 60 + alm_tm.tm_sec;
 		ttime.usec = 0;
 		if (hp_sdc_rtc_set_mt(&ttime)) return -EFAULT;
                 return 0;
         }
         case RTC_RD_TIME:       /* Read the time/date from RTC  */
         {
 		if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
                 break;
         }
         case RTC_SET_TIME:      /* Set the RTC */
         {
                 struct rtc_time hp_sdc_rtc_tm;
                 unsigned char mon, day, hrs, min, sec, leap_yr;
                 unsigned int yrs;

                 if (!capable(CAP_SYS_TIME))
                         return -EACCES;
 		if (copy_from_user(&hp_sdc_rtc_tm, (struct rtc_time *)arg,
                                    sizeof(struct rtc_time)))
                         return -EFAULT;

                 yrs = hp_sdc_rtc_tm.tm_year + 1900;
                 mon = hp_sdc_rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
                 day = hp_sdc_rtc_tm.tm_mday;
                 hrs = hp_sdc_rtc_tm.tm_hour;
                 min = hp_sdc_rtc_tm.tm_min;
                 sec = hp_sdc_rtc_tm.tm_sec;

                 if (yrs < 1970)
                         return -EINVAL;

                 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));

                 if ((mon > 12) || (day == 0))
                         return -EINVAL;
                 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
                         return -EINVAL;
 		if ((hrs >= 24) || (min >= 60) || (sec >= 60))
                         return -EINVAL;

                 if ((yrs -= eH) > 255)    /* They are unsigned */
                         return -EINVAL;


                 return 0;
         }
         case RTC_EPOCH_READ:    /* Read the epoch.      */
         {
                 return put_user (epoch, (unsigned long *)arg);
         }
         case RTC_EPOCH_SET:     /* Set the epoch.       */
         {
                 /*
                  * There were no RTC clocks before 1900.
                  */
                 if (arg < 1900)
 		  return -EINVAL;
 		if (!capable(CAP_SYS_TIME))
 		  return -EACCES;

                 epoch = arg;
                 return 0;
         }
         default:
                 return -EINVAL;
         }
         return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
 #endif
 }

 static struct file_operations hp_sdc_rtc_fops = {
         .owner =	THIS_MODULE,
         .llseek =	no_llseek,
         .read =		hp_sdc_rtc_read,
         .poll =		hp_sdc_rtc_poll,
         .ioctl =	hp_sdc_rtc_ioctl,
         .open =		hp_sdc_rtc_open,
         .release =	hp_sdc_rtc_release,
         .fasync =	hp_sdc_rtc_fasync,
 };

 static struct miscdevice hp_sdc_rtc_dev = {
         .minor =	RTC_MINOR,
         .name =		"rtc_HIL",
         .fops =		&hp_sdc_rtc_fops
 };

 static int __init hp_sdc_rtc_init(void)
 {
 	int ret;

 	init_MUTEX(&i8042tregs);

 	if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr)))
 		return ret;
 	misc_register(&hp_sdc_rtc_dev);
         create_proc_read_entry ("driver/rtc", 0, NULL,
 				hp_sdc_rtc_read_proc, NULL);

 	printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support loaded "
 			 "(RTC v " RTC_VERSION ")\n");

 	return 0;
 }

 static void __exit hp_sdc_rtc_exit(void)
 {
 	remove_proc_entry ("driver/rtc", NULL);
         misc_deregister(&hp_sdc_rtc_dev);
 	hp_sdc_release_timer_irq(hp_sdc_rtc_isr);
         printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n");
 }

 module_init(hp_sdc_rtc_init);
 module_exit(hp_sdc_rtc_exit);
	/*
	* HP i8042 SDC + MSM-58321 BBRTC driver.
	*
	* Copyright (c) 2001 Brian S. Julin
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions, and the following disclaimer,
	* without modification.
	* 2. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* Alternatively, this software may be distributed under the terms of the
	* GNU General Public License ("GPL").
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	*
	* References:
	* System Device Controller Microprocessor Firmware Theory of Operation
	* for Part Number 1820-4784 Revision B. Dwg No. A-1820-4784-2
	* efirtc.c by Stephane Eranian/Hewlett Packard
	*
	*/

	#include <linux/hp_sdc.h>
	#include <linux/errno.h>
	#include <linux/types.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/time.h>
	#include <linux/miscdevice.h>
	#include <linux/proc_fs.h>
	#include <linux/poll.h>
	#include <linux/rtc.h>

	MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
	MODULE_DESCRIPTION("HP i8042 SDC + MSM-58321 RTC Driver");
	MODULE_LICENSE("Dual BSD/GPL");

	#define RTC_VERSION "1.10d"

	static unsigned long epoch = 2000;

	static struct semaphore i8042tregs;

	static hp_sdc_irqhook hp_sdc_rtc_isr;

	static struct fasync_struct *hp_sdc_rtc_async_queue;

	static DECLARE_WAIT_QUEUE_HEAD(hp_sdc_rtc_wait);

	static ssize_t hp_sdc_rtc_read(struct file file, char __user buf,
	size_t count, loff_t *ppos);

	static int hp_sdc_rtc_ioctl(struct inode inode, struct file file,
	unsigned int cmd, unsigned long arg);

	static unsigned int hp_sdc_rtc_poll(struct file file, poll_table wait);

	static int hp_sdc_rtc_open(struct inode inode, struct file file);
	static int hp_sdc_rtc_release(struct inode inode, struct file file);
	static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on);

	static int hp_sdc_rtc_read_proc(char page, char *start, off_t off,
	int count, int eof, void data);

	static void hp_sdc_rtc_isr (int irq, void *dev_id,
	uint8_t status, uint8_t data)
	{
	return;
	}

	static int hp_sdc_rtc_do_read_bbrtc (struct rtc_time *rtctm)
	{
	struct semaphore tsem;
	hp_sdc_transaction t;
	uint8_t tseq[91];
	int i;

	i = 0;
	while (i < 91) {
	tseq[i++] = HP_SDC_ACT_DATAREG \|
	HP_SDC_ACT_POSTCMD \| HP_SDC_ACT_DATAIN;
	tseq[i++] = 0x01; /* write i8042[0x70] */
	tseq[i] = i / 7; /* BBRTC reg address */
	i++;
	tseq[i++] = HP_SDC_CMD_DO_RTCR; /* Trigger command */
	tseq[i++] = 2; /* expect 1 stat/dat pair back. */
	i++; i++; /* buffer for stat/dat pair */
	}
	tseq[84] \|= HP_SDC_ACT_SEMAPHORE;
	t.endidx = 91;
	t.seq = tseq;
	t.act.semaphore = &tsem;
	init_MUTEX_LOCKED(&tsem);

	if (hp_sdc_enqueue_transaction(&t)) return -1;

	down_interruptible(&tsem); /* Put ourselves to sleep for results. */

	/* Check for nonpresence of BBRTC */
	if (!((tseq[83] \| tseq[90] \| tseq[69] \| tseq[76] \|
	tseq[55] \| tseq[62] \| tseq[34] \| tseq[41] \|
	tseq[20] \| tseq[27] \| tseq[6] \| tseq[13]) & 0x0f))
	return -1;

	memset(rtctm, 0, sizeof(struct rtc_time));
	rtctm->tm_year = (tseq[83] & 0x0f) + (tseq[90] & 0x0f) * 10;
	rtctm->tm_mon = (tseq[69] & 0x0f) + (tseq[76] & 0x0f) * 10;
	rtctm->tm_mday = (tseq[55] & 0x0f) + (tseq[62] & 0x0f) * 10;
	rtctm->tm_wday = (tseq[48] & 0x0f);
	rtctm->tm_hour = (tseq[34] & 0x0f) + (tseq[41] & 0x0f) * 10;
	rtctm->tm_min = (tseq[20] & 0x0f) + (tseq[27] & 0x0f) * 10;
	rtctm->tm_sec = (tseq[6] & 0x0f) + (tseq[13] & 0x0f) * 10;

	return 0;
	}

	static int hp_sdc_rtc_read_bbrtc (struct rtc_time *rtctm)
	{
	struct rtc_time tm, tm_last;
	int i = 0;

	/* MSM-58321 has no read latch, so must read twice and compare. */

	if (hp_sdc_rtc_do_read_bbrtc(&tm_last)) return -1;
	if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;

	while (memcmp(&tm, &tm_last, sizeof(struct rtc_time))) {
	if (i++ > 4) return -1;
	memcpy(&tm_last, &tm, sizeof(struct rtc_time));
	if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;
	}

	memcpy(rtctm, &tm, sizeof(struct rtc_time));

	return 0;
	}


	static int64_t hp_sdc_rtc_read_i8042timer (uint8_t loadcmd, int numreg)
	{
	hp_sdc_transaction t;
	uint8_t tseq[26] = {
	HP_SDC_ACT_PRECMD \| HP_SDC_ACT_POSTCMD \| HP_SDC_ACT_DATAIN,
	0,
	HP_SDC_CMD_READ_T1, 2, 0, 0,
	HP_SDC_ACT_POSTCMD \| HP_SDC_ACT_DATAIN,
	HP_SDC_CMD_READ_T2, 2, 0, 0,
	HP_SDC_ACT_POSTCMD \| HP_SDC_ACT_DATAIN,
	HP_SDC_CMD_READ_T3, 2, 0, 0,
	HP_SDC_ACT_POSTCMD \| HP_SDC_ACT_DATAIN,
	HP_SDC_CMD_READ_T4, 2, 0, 0,
	HP_SDC_ACT_POSTCMD \| HP_SDC_ACT_DATAIN,
	HP_SDC_CMD_READ_T5, 2, 0, 0
	};

	t.endidx = numreg * 5;

	tseq[1] = loadcmd;
	tseq[t.endidx - 4] \|= HP_SDC_ACT_SEMAPHORE; /* numreg assumed > 1 */

	t.seq = tseq;
	t.act.semaphore = &i8042tregs;

	down_interruptible(&i8042tregs); /* Sleep if output regs in use. */

	if (hp_sdc_enqueue_transaction(&t)) return -1;

	down_interruptible(&i8042tregs); /* Sleep until results come back. */
	up(&i8042tregs);

	return (tseq[5] \|
	((uint64_t)(tseq[10]) << 8) \| ((uint64_t)(tseq[15]) << 16) \|
	((uint64_t)(tseq[20]) << 24) \| ((uint64_t)(tseq[25]) << 32));
	}


	/* Read the i8042 real-time clock */
	static inline int hp_sdc_rtc_read_rt(struct timeval *res) {
	int64_t raw;
	uint32_t tenms;
	unsigned int days;

	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_RT, 5);
	if (raw < 0) return -1;

	tenms = (uint32_t)raw & 0xffffff;
	days = (unsigned int)(raw >> 24) & 0xffff;

	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
	res->tv_sec = (time_t)(tenms / 100) + days * 86400;

	return 0;
	}


	/* Read the i8042 fast handshake timer */
	static inline int hp_sdc_rtc_read_fhs(struct timeval *res) {
	uint64_t raw;
	unsigned int tenms;

	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_FHS, 2);
	if (raw < 0) return -1;

	tenms = (unsigned int)raw & 0xffff;

	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
	res->tv_sec = (time_t)(tenms / 100);

	return 0;
	}


	/* Read the i8042 match timer (a.k.a. alarm) */
	static inline int hp_sdc_rtc_read_mt(struct timeval *res) {
	int64_t raw;
	uint32_t tenms;

	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_MT, 3);
	if (raw < 0) return -1;

	tenms = (uint32_t)raw & 0xffffff;

	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
	res->tv_sec = (time_t)(tenms / 100);

	return 0;
	}


	/* Read the i8042 delay timer */
	static inline int hp_sdc_rtc_read_dt(struct timeval *res) {
	int64_t raw;
	uint32_t tenms;

	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_DT, 3);
	if (raw < 0) return -1;

	tenms = (uint32_t)raw & 0xffffff;

	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
	res->tv_sec = (time_t)(tenms / 100);

	return 0;
	}


	/* Read the i8042 cycle timer (a.k.a. periodic) */
	static inline int hp_sdc_rtc_read_ct(struct timeval *res) {
	int64_t raw;
	uint32_t tenms;

	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_CT, 3);
	if (raw < 0) return -1;

	tenms = (uint32_t)raw & 0xffffff;

	res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
	res->tv_sec = (time_t)(tenms / 100);

	return 0;
	}


	/* Set the i8042 real-time clock */
	static int hp_sdc_rtc_set_rt (struct timeval *setto)
	{
	uint32_t tenms;
	unsigned int days;
	hp_sdc_transaction t;
	uint8_t tseq[11] = {
	HP_SDC_ACT_PRECMD \| HP_SDC_ACT_DATAOUT,
	HP_SDC_CMD_SET_RTMS, 3, 0, 0, 0,
	HP_SDC_ACT_PRECMD \| HP_SDC_ACT_DATAOUT,
	HP_SDC_CMD_SET_RTD, 2, 0, 0
	};

	t.endidx = 10;

	if (0xffff < setto->tv_sec / 86400) return -1;
	days = setto->tv_sec / 86400;
	if (0xffff < setto->tv_usec / 1000000 / 86400) return -1;
	days += ((setto->tv_sec % 86400) + setto->tv_usec / 1000000) / 86400;
	if (days > 0xffff) return -1;

	if (0xffffff < setto->tv_sec) return -1;
	tenms = setto->tv_sec * 100;
	if (0xffffff < setto->tv_usec / 10000) return -1;
	tenms += setto->tv_usec / 10000;
	if (tenms > 0xffffff) return -1;

	tseq[3] = (uint8_t)(tenms & 0xff);
	tseq[4] = (uint8_t)((tenms >> 8) & 0xff);
	tseq[5] = (uint8_t)((tenms >> 16) & 0xff);

	tseq[9] = (uint8_t)(days & 0xff);
	tseq[10] = (uint8_t)((days >> 8) & 0xff);

	t.seq = tseq;

	if (hp_sdc_enqueue_transaction(&t)) return -1;
	return 0;
	}

	/* Set the i8042 fast handshake timer */
	static int hp_sdc_rtc_set_fhs (struct timeval *setto)
	{
	uint32_t tenms;
	hp_sdc_transaction t;
	uint8_t tseq[5] = {
	HP_SDC_ACT_PRECMD \| HP_SDC_ACT_DATAOUT,
	HP_SDC_CMD_SET_FHS, 2, 0, 0
	};

	t.endidx = 4;

	if (0xffff < setto->tv_sec) return -1;
	tenms = setto->tv_sec * 100;
	if (0xffff < setto->tv_usec / 10000) return -1;
	tenms += setto->tv_usec / 10000;
	if (tenms > 0xffff) return -1;

	tseq[3] = (uint8_t)(tenms & 0xff);
	tseq[4] = (uint8_t)((tenms >> 8) & 0xff);

	t.seq = tseq;

	if (hp_sdc_enqueue_transaction(&t)) return -1;
	return 0;
	}


	/* Set the i8042 match timer (a.k.a. alarm) */
	#define hp_sdc_rtc_set_mt (setto) \
	hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_MT)

	/* Set the i8042 delay timer */
	#define hp_sdc_rtc_set_dt (setto) \
	hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_DT)

	/* Set the i8042 cycle timer (a.k.a. periodic) */
	#define hp_sdc_rtc_set_ct (setto) \
	hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_CT)

	/* Set one of the i8042 3-byte wide timers */
	static int hp_sdc_rtc_set_i8042timer (struct timeval *setto, uint8_t setcmd)
	{
	uint32_t tenms;
	hp_sdc_transaction t;
	uint8_t tseq[6] = {
	HP_SDC_ACT_PRECMD \| HP_SDC_ACT_DATAOUT,
	0, 3, 0, 0, 0
	};

	t.endidx = 6;

	if (0xffffff < setto->tv_sec) return -1;
	tenms = setto->tv_sec * 100;
	if (0xffffff < setto->tv_usec / 10000) return -1;
	tenms += setto->tv_usec / 10000;
	if (tenms > 0xffffff) return -1;

	tseq[1] = setcmd;
	tseq[3] = (uint8_t)(tenms & 0xff);
	tseq[4] = (uint8_t)((tenms >> 8) & 0xff);
	tseq[5] = (uint8_t)((tenms >> 16) & 0xff);

	t.seq = tseq;

	if (hp_sdc_enqueue_transaction(&t)) {
	return -1;
	}
	return 0;
	}

	static ssize_t hp_sdc_rtc_read(struct file file, char __user buf,
	size_t count, loff_t *ppos) {
	ssize_t retval;

	if (count < sizeof(unsigned long))
	return -EINVAL;

	retval = put_user(68, (unsigned long __user *)buf);
	return retval;
	}

	static unsigned int hp_sdc_rtc_poll(struct file file, poll_table wait)
	{
	unsigned long l;

	l = 0;
	if (l != 0)
	return POLLIN \| POLLRDNORM;
	return 0;
	}

	static int hp_sdc_rtc_open(struct inode inode, struct file file)
	{
	return 0;
	}

	static int hp_sdc_rtc_release(struct inode inode, struct file file)
	{
	/* Turn off interrupts? */

	if (file->f_flags & FASYNC) {
	hp_sdc_rtc_fasync (-1, file, 0);
	}

	return 0;
	}

	static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on)
	{
	return fasync_helper (fd, filp, on, &hp_sdc_rtc_async_queue);
	}

	static int hp_sdc_rtc_proc_output (char *buf)
	{
	#define YN(bit) ("no")
	#define NY(bit) ("yes")
	char *p;
	struct rtc_time tm;
	struct timeval tv;

	memset(&tm, 0, sizeof(struct rtc_time));

	p = buf;

	if (hp_sdc_rtc_read_bbrtc(&tm)) {
	p += sprintf(p, "BBRTC\t\t: READ FAILED!\n");
	} else {
	p += sprintf(p,
	"rtc_time\t: %02d:%02d:%02d\n"
	"rtc_date\t: %04d-%02d-%02d\n"
	"rtc_epoch\t: %04lu\n",
	tm.tm_hour, tm.tm_min, tm.tm_sec,
	tm.tm_year + 1900, tm.tm_mon + 1,
	tm.tm_mday, epoch);
	}

	if (hp_sdc_rtc_read_rt(&tv)) {
	p += sprintf(p, "i8042 rtc\t: READ FAILED!\n");
	} else {
	p += sprintf(p, "i8042 rtc\t: %ld.%02d seconds\n",
	tv.tv_sec, tv.tv_usec/1000);
	}

	if (hp_sdc_rtc_read_fhs(&tv)) {
	p += sprintf(p, "handshake\t: READ FAILED!\n");
	} else {
	p += sprintf(p, "handshake\t: %ld.%02d seconds\n",
	tv.tv_sec, tv.tv_usec/1000);
	}

	if (hp_sdc_rtc_read_mt(&tv)) {
	p += sprintf(p, "alarm\t\t: READ FAILED!\n");
	} else {
	p += sprintf(p, "alarm\t\t: %ld.%02d seconds\n",
	tv.tv_sec, tv.tv_usec/1000);
	}

	if (hp_sdc_rtc_read_dt(&tv)) {
	p += sprintf(p, "delay\t\t: READ FAILED!\n");
	} else {
	p += sprintf(p, "delay\t\t: %ld.%02d seconds\n",
	tv.tv_sec, tv.tv_usec/1000);
	}

	if (hp_sdc_rtc_read_ct(&tv)) {
	p += sprintf(p, "periodic\t: READ FAILED!\n");
	} else {
	p += sprintf(p, "periodic\t: %ld.%02d seconds\n",
	tv.tv_sec, tv.tv_usec/1000);
	}

	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",
	YN(RTC_DST_EN),
	NY(RTC_DM_BINARY),
	YN(RTC_24H),
	YN(RTC_SQWE),
	YN(RTC_AIE),
	YN(RTC_UIE),
	YN(RTC_PIE),
	1UL,
	1 ? "okay" : "dead");

	return p - buf;
	#undef YN
	#undef NY
	}

	static int hp_sdc_rtc_read_proc(char page, char *start, off_t off,
	int count, int eof, void data)
	{
	int len = hp_sdc_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 hp_sdc_rtc_ioctl(struct inode inode, struct file file,
	unsigned int cmd, unsigned long arg)
	{
	#if 1
	return -EINVAL;
	#else

	struct rtc_time wtime;
	struct timeval ttime;
	int use_wtime = 0;

	/* This needs major work. */

	switch (cmd) {

	case RTC_AIE_OFF: /* Mask alarm int. enab. bit */
	case RTC_AIE_ON: /* Allow alarm interrupts. */
	case RTC_PIE_OFF: /* Mask periodic int. enab. bit */
	case RTC_PIE_ON: /* Allow periodic ints */
	case RTC_UIE_ON: /* Allow ints for RTC updates. */
	case RTC_UIE_OFF: /* Allow ints for RTC updates. */
	{
	/* We cannot mask individual user timers and we
	cannot tell them apart when they occur, so it
	would be disingenuous to succeed these IOCTLs */
	return -EINVAL;
	}
	case RTC_ALM_READ: /* Read the present alarm time */
	{
	if (hp_sdc_rtc_read_mt(&ttime)) return -EFAULT;
	if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;

	wtime.tm_hour = ttime.tv_sec / 3600; ttime.tv_sec %= 3600;
	wtime.tm_min = ttime.tv_sec / 60; ttime.tv_sec %= 60;
	wtime.tm_sec = ttime.tv_sec;

	break;
	}
	case RTC_IRQP_READ: /* Read the periodic IRQ rate. */
	{
	return put_user(hp_sdc_rtc_freq, (unsigned long *)arg);
	}
	case RTC_IRQP_SET: /* Set periodic IRQ rate. */
	{
	/*
	* The max we can do is 100Hz.
	*/

	if ((arg < 1) \|\| (arg > 100)) return -EINVAL;
	ttime.tv_sec = 0;
	ttime.tv_usec = 1000000 / arg;
	if (hp_sdc_rtc_set_ct(&ttime)) return -EFAULT;
	hp_sdc_rtc_freq = arg;
	return 0;
	}
	case RTC_ALM_SET: /* Store a time into the alarm */
	{
	/*
	* This expects a struct hp_sdc_rtc_time. Writing 0xff means
	* "don't care" or "match all" for PC timers. The HP SDC
	* does not support that perk, but it could be emulated fairly
	* easily. Only the tm_hour, tm_min and tm_sec are used.
	* We could do it with 10ms accuracy with the HP SDC, if the
	* rtc interface left us a way to do that.
	*/
	struct hp_sdc_rtc_time alm_tm;

	if (copy_from_user(&alm_tm, (struct hp_sdc_rtc_time*)arg,
	sizeof(struct hp_sdc_rtc_time)))
	return -EFAULT;

	if (alm_tm.tm_hour > 23) return -EINVAL;
	if (alm_tm.tm_min > 59) return -EINVAL;
	if (alm_tm.tm_sec > 59) return -EINVAL;

	ttime.sec = alm_tm.tm_hour * 3600 +
	alm_tm.tm_min * 60 + alm_tm.tm_sec;
	ttime.usec = 0;
	if (hp_sdc_rtc_set_mt(&ttime)) return -EFAULT;
	return 0;
	}
	case RTC_RD_TIME: /* Read the time/date from RTC */
	{
	if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
	break;
	}
	case RTC_SET_TIME: /* Set the RTC */
	{
	struct rtc_time hp_sdc_rtc_tm;
	unsigned char mon, day, hrs, min, sec, leap_yr;
	unsigned int yrs;

	if (!capable(CAP_SYS_TIME))
	return -EACCES;
	if (copy_from_user(&hp_sdc_rtc_tm, (struct rtc_time *)arg,
	sizeof(struct rtc_time)))
	return -EFAULT;

	yrs = hp_sdc_rtc_tm.tm_year + 1900;
	mon = hp_sdc_rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
	day = hp_sdc_rtc_tm.tm_mday;
	hrs = hp_sdc_rtc_tm.tm_hour;
	min = hp_sdc_rtc_tm.tm_min;
	sec = hp_sdc_rtc_tm.tm_sec;

	if (yrs < 1970)
	return -EINVAL;

	leap_yr = ((!(yrs % 4) && (yrs % 100)) \|\| !(yrs % 400));

	if ((mon > 12) \|\| (day == 0))
	return -EINVAL;
	if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
	return -EINVAL;
	if ((hrs >= 24) \|\| (min >= 60) \|\| (sec >= 60))
	return -EINVAL;

	if ((yrs -= eH) > 255) /* They are unsigned */
	return -EINVAL;


	return 0;
	}
	case RTC_EPOCH_READ: /* Read the epoch. */
	{
	return put_user (epoch, (unsigned long *)arg);
	}
	case RTC_EPOCH_SET: /* Set the epoch. */
	{
	/*
	* There were no RTC clocks before 1900.
	*/
	if (arg < 1900)
	return -EINVAL;
	if (!capable(CAP_SYS_TIME))
	return -EACCES;

	epoch = arg;
	return 0;
	}
	default:
	return -EINVAL;
	}
	return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
	#endif
	}

	static struct file_operations hp_sdc_rtc_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.read = hp_sdc_rtc_read,
	.poll = hp_sdc_rtc_poll,
	.ioctl = hp_sdc_rtc_ioctl,
	.open = hp_sdc_rtc_open,
	.release = hp_sdc_rtc_release,
	.fasync = hp_sdc_rtc_fasync,
	};

	static struct miscdevice hp_sdc_rtc_dev = {
	.minor = RTC_MINOR,
	.name = "rtc_HIL",
	.fops = &hp_sdc_rtc_fops
	};

	static int __init hp_sdc_rtc_init(void)
	{
	int ret;

	init_MUTEX(&i8042tregs);

	if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr)))
	return ret;
	misc_register(&hp_sdc_rtc_dev);
	create_proc_read_entry ("driver/rtc", 0, NULL,
	hp_sdc_rtc_read_proc, NULL);

	printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support loaded "
	"(RTC v " RTC_VERSION ")\n");

	return 0;
	}

	static void __exit hp_sdc_rtc_exit(void)
	{
	remove_proc_entry ("driver/rtc", NULL);
	misc_deregister(&hp_sdc_rtc_dev);
	hp_sdc_release_timer_irq(hp_sdc_rtc_isr);
	printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n");
	}

	module_init(hp_sdc_rtc_init);
	module_exit(hp_sdc_rtc_exit);