[RFC][PATCH] m68k/parisc: Convert hp_sdc_rtc driver to rtc framework

[Helge Deller <deller@gmx.de>]

This patch is a first step to convert the hp_sdc_rtc driver to the new
rtc framework.

The HP SDC RTC driver is available on HP machines only, which run either
a parisc or a m68k processor.  I did tested this patch on a parisc
machine, but it would be nice if someone with a m68k machine could test
it too.
    
Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/drivers/input/misc/hp_sdc_rtc.c b/drivers/input/misc/hp_sdc_rtc.c
index 47eb8ca729fe..c787bde12fce 100644
--- a/drivers/input/misc/hp_sdc_rtc.c
+++ b/drivers/input/misc/hp_sdc_rtc.c
@@ -34,51 +34,27 @@
  */
 
 #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/seq_file.h>
-#include <linux/poll.h>
 #include <linux/rtc.h>
-#include <linux/mutex.h>
 #include <linux/semaphore.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"
+#define RTC_VERSION "1.2"
 
-static DEFINE_MUTEX(hp_sdc_rtc_mutex);
-static unsigned long epoch = 2000;
+static struct rtc_device *rtc;
 
 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 long hp_sdc_rtc_unlocked_ioctl(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_fasync (int fd, struct file *filp, int on);
-
 static void hp_sdc_rtc_isr (int irq, void *dev_id, 
 			    uint8_t status, uint8_t data) 
 {
-	return;
+	/* Notify RTC core on alarm event */
+	rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
 }
 
 static int hp_sdc_rtc_do_read_bbrtc (struct rtc_time *rtctm)
@@ -105,17 +81,18 @@ static int hp_sdc_rtc_do_read_bbrtc (struct rtc_time *rtctm)
 	t.act.semaphore =	&tsem;
 	sema_init(&tsem, 0);
 	
-	if (hp_sdc_enqueue_transaction(&t)) return -1;
+	if (hp_sdc_enqueue_transaction(&t))
+		return -EIO;
 	
 	/* Put ourselves to sleep for results. */
 	if (WARN_ON(down_interruptible(&tsem)))
-		return -1;
+		return -EIO;
 	
 	/* 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;
+		return -ENODEV;
 
 	memset(rtctm, 0, sizeof(struct rtc_time));
 	rtctm->tm_year = (tseq[83] & 0x0f) + (tseq[90] & 0x0f) * 10;
@@ -132,17 +109,24 @@ static int hp_sdc_rtc_do_read_bbrtc (struct rtc_time *rtctm)
 static int hp_sdc_rtc_read_bbrtc (struct rtc_time *rtctm)
 {
 	struct rtc_time tm, tm_last;
-	int i = 0;
+	int i = 0, ret;
 
 	/* 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;
+	ret = hp_sdc_rtc_do_read_bbrtc(&tm_last);
+	if (ret)
+		return ret;
+	ret = hp_sdc_rtc_do_read_bbrtc(&tm);
+	if (ret)
+		return ret;
 
 	while (memcmp(&tm, &tm_last, sizeof(struct rtc_time))) {
-		if (i++ > 4) return -1;
+		if (i++ > 4)
+			return -EAGAIN;
 		memcpy(&tm_last, &tm, sizeof(struct rtc_time));
-		if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;
+		ret = hp_sdc_rtc_do_read_bbrtc(&tm);
+		if (ret)
+			return ret;
 	}
 
 	memcpy(rtctm, &tm, sizeof(struct rtc_time));
@@ -150,7 +134,6 @@ static int hp_sdc_rtc_read_bbrtc (struct rtc_time *rtctm)
 	return 0;
 }
 
-
 static int64_t hp_sdc_rtc_read_i8042timer (uint8_t loadcmd, int numreg)
 {
 	hp_sdc_transaction t;
@@ -178,16 +161,16 @@ static int64_t hp_sdc_rtc_read_i8042timer (uint8_t loadcmd, int numreg)
 
 	/* Sleep if output regs in use. */
 	if (WARN_ON(down_interruptible(&i8042tregs)))
-		return -1;
+		return -EIO;
 
 	if (hp_sdc_enqueue_transaction(&t)) {
 		up(&i8042tregs);
-		return -1;
+		return -EIO;
 	}
 	
 	/* Sleep until results come back. */
 	if (WARN_ON(down_interruptible(&i8042tregs)))
-		return -1;
+		return -EIO;
 
 	up(&i8042tregs);
 
@@ -198,13 +181,15 @@ static int64_t hp_sdc_rtc_read_i8042timer (uint8_t loadcmd, int numreg)
 
 
 /* Read the i8042 real-time clock */
-static inline int hp_sdc_rtc_read_rt(struct timespec64 *res) {
+static int hp_sdc_rtc_read_rt(struct timespec64 *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;
+	if (raw < 0)
+		return -EIO;
 
 	tenms = (uint32_t)raw & 0xffffff;
 	days  = (unsigned int)(raw >> 24) & 0xffff;
@@ -222,7 +207,8 @@ static inline int hp_sdc_rtc_read_fhs(struct timespec64 *res) {
 	unsigned int tenms;
 
 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_FHS, 2);
-	if (raw < 0) return -1;
+	if (raw < 0)
+		return -EIO;
 
 	tenms = (unsigned int)raw & 0xffff;
 
@@ -239,7 +225,8 @@ static inline int hp_sdc_rtc_read_mt(struct timespec64 *res) {
 	uint32_t tenms; 
 
 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_MT, 3);
-	if (raw < 0) return -1;
+	if (raw < 0)
+		return -EIO;
 
 	tenms = (uint32_t)raw & 0xffffff;
 
@@ -256,7 +243,8 @@ static inline int hp_sdc_rtc_read_dt(struct timespec64 *res) {
 	uint32_t tenms;
 
 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_DT, 3);
-	if (raw < 0) return -1;
+	if (raw < 0)
+		return -EIO;
 
 	tenms = (uint32_t)raw & 0xffffff;
 
@@ -273,7 +261,8 @@ static inline int hp_sdc_rtc_read_ct(struct timespec64 *res) {
 	uint32_t tenms;
 
 	raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_CT, 3);
-	if (raw < 0) return -1;
+	if (raw < 0)
+		return -EIO;
 
 	tenms = (uint32_t)raw & 0xffffff;
 
@@ -284,11 +273,11 @@ static inline int hp_sdc_rtc_read_ct(struct timespec64 *res) {
 }
 
 
-#if 0 /* not used yet */
 /* Set the i8042 real-time clock */
-static int hp_sdc_rtc_set_rt (struct timeval *setto)
+static int hp_sdc_rtc_set_rt(struct rtc_time *tm)
 {
 	uint32_t tenms;
+	time64_t seconds;
 	unsigned int days;
 	hp_sdc_transaction t;
 	uint8_t tseq[11] = {
@@ -300,17 +289,13 @@ static int hp_sdc_rtc_set_rt (struct timeval *setto)
 
 	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;
+	seconds = rtc_tm_to_time64(tm);
+	days = seconds / 86400;
+	if (days > 0xffff)
+		return -EINVAL;
+	tenms  = (seconds % 86400) * 100;
+	if (tenms > 0xffffff)
+		return -EINVAL;
 
 	tseq[3] = (uint8_t)(tenms & 0xff);
 	tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
@@ -321,12 +306,14 @@ static int hp_sdc_rtc_set_rt (struct timeval *setto)
 
 	t.seq =	tseq;
 
-	if (hp_sdc_enqueue_transaction(&t)) return -1;
+	if (hp_sdc_enqueue_transaction(&t))
+		return -EIO;
 	return 0;
 }
 
 /* Set the i8042 fast handshake timer */
-static int hp_sdc_rtc_set_fhs (struct timeval *setto)
+#if 0
+static int hp_sdc_rtc_set_fhs(struct timespec64 *setto)
 {
 	uint32_t tenms;
 	hp_sdc_transaction t;
@@ -337,36 +324,36 @@ static int hp_sdc_rtc_set_fhs (struct timeval *setto)
 
 	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;
+	tenms += setto->tv_nsec / 10000 / 1000;
+	if (tenms > 0xffff)
+		return -EINVAL;
 
 	tseq[3] = (uint8_t)(tenms & 0xff);
 	tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 
 	t.seq =	tseq;
 
-	if (hp_sdc_enqueue_transaction(&t)) return -1;
+	if (hp_sdc_enqueue_transaction(&t))
+		return -EIO;
 	return 0;
 }
-
+#endif
 
 /* Set the i8042 match timer (a.k.a. alarm) */
-#define hp_sdc_rtc_set_mt (setto) \
+#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) \
+#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) \
+#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)
+static int hp_sdc_rtc_set_i8042timer(struct timespec64 *setto, uint8_t setcmd)
 {
 	uint32_t tenms;
 	hp_sdc_transaction t;
@@ -377,58 +364,96 @@ static int hp_sdc_rtc_set_i8042timer (struct timeval *setto, uint8_t setcmd)
 
 	t.endidx = 6;
 
-	if (0xffffff < setto->tv_sec) return -1;
+	if (setto->tv_sec > 0xffffff)
+		return -EINVAL;
 	tenms  = setto->tv_sec * 100;
-	if (0xffffff < setto->tv_usec / 10000) return -1;
-	tenms += setto->tv_usec / 10000;
-	if (tenms > 0xffffff) return -1;
+	if (setto->tv_nsec / 10000 / 1000 > 0xffffff)
+		return -EINVAL;
+	tenms += setto->tv_nsec / 10000 / 1000;
+	if (tenms > 0xffffff)
+		return -EINVAL;
 
 	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;
+	t.seq =	tseq;
 
 	if (hp_sdc_enqueue_transaction(&t)) { 
-		return -1;
+		return -EIO;
 	}
 	return 0;
 }
-#endif
 
-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 int hp_sdc_rtc_get_time(struct device *dev, struct rtc_time *tm)
+{
+	return hp_sdc_rtc_read_bbrtc(tm);
 }
 
-static __poll_t hp_sdc_rtc_poll(struct file *file, poll_table *wait)
+static int hp_sdc_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
-        unsigned long l;
+	if (!rtc_valid_tm(tm))
+		return -EINVAL;
 
-	l = 0;
-        if (l != 0)
-                return EPOLLIN | EPOLLRDNORM;
-        return 0;
+	return hp_sdc_rtc_set_rt(tm);
 }
 
-static int hp_sdc_rtc_open(struct inode *inode, struct file *file)
+static int hp_sdc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wa)
 {
-        return 0;
+	/* Read the present alarm time */
+	int ret;
+	struct timespec64 ttime;
+	struct rtc_time *wtime = &wa->time;
+
+	ret = hp_sdc_rtc_read_mt(&ttime);
+	if (ret)
+		return ret;
+	ret = hp_sdc_rtc_read_bbrtc(wtime);
+	if (ret)
+		return ret;
+
+	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;
+
+	wa->enabled = 0;
+	wa->pending = 0;
+
+	return 0;
 }
 
-static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on)
+static int hp_sdc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wa)
 {
-        return fasync_helper (fd, filp, on, &hp_sdc_rtc_async_queue);
+	/* Set the alarm time */
+	struct timespec64 ttime;
+
+	/*
+	 * 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.
+	 */
+
+	if (wa->time.tm_hour > 23)
+		return -EINVAL;
+	if (wa->time.tm_min  > 59)
+		return -EINVAL;
+	if (wa->time.tm_sec  > 59)
+		return -EINVAL;
+
+	ttime.tv_sec = wa->time.tm_hour * 3600 +
+	  wa->time.tm_min * 60 + wa->time.tm_sec;
+	ttime.tv_nsec = 0;
+	if (hp_sdc_rtc_set_mt(&ttime))
+		return -EIO;
+
+	return 0;
 }
 
-static int hp_sdc_rtc_proc_show(struct seq_file *m, void *v)
+static int hp_sdc_rtc_proc(struct device *dev, struct seq_file *m)
 {
 #define YN(bit) ("no")
 #define NY(bit) ("yes")
@@ -442,11 +467,10 @@ static int hp_sdc_rtc_proc_show(struct seq_file *m, void *v)
 	} else {
 		seq_printf(m,
 			     "rtc_time\t: %02d:%02d:%02d\n"
-			     "rtc_date\t: %04d-%02d-%02d\n"
-			     "rtc_epoch\t: %04lu\n",
+			     "rtc_date\t: %04d-%02d-%02d\n",
 			     tm.tm_hour, tm.tm_min, tm.tm_sec,
 			     tm.tm_year + 1900, tm.tm_mon + 1, 
-			     tm.tm_mday, epoch);
+			     tm.tm_mday);
 	}
 
 	if (hp_sdc_rtc_read_rt(&tv)) {
@@ -509,185 +533,42 @@ static int hp_sdc_rtc_proc_show(struct seq_file *m, void *v)
 #undef NY
 }
 
-static int hp_sdc_rtc_ioctl(struct file *file, 
+static int hp_sdc_rtc_ioctl(struct device *dev,
 			    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.      */
+	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.  */
-        {
+	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 long hp_sdc_rtc_unlocked_ioctl(struct file *file,
-				      unsigned int cmd, unsigned long arg)
-{
-	int ret;
-
-	mutex_lock(&hp_sdc_rtc_mutex);
-	ret = hp_sdc_rtc_ioctl(file, cmd, arg);
-	mutex_unlock(&hp_sdc_rtc_mutex);
-
-	return ret;
+	}
+	default:
+		return -ENOIOCTLCMD;
+	}
+	return 0;
 }
 
-
-static const struct file_operations hp_sdc_rtc_fops = {
-        .owner =		THIS_MODULE,
-        .llseek =		no_llseek,
-        .read =			hp_sdc_rtc_read,
-        .poll =			hp_sdc_rtc_poll,
-        .unlocked_ioctl =	hp_sdc_rtc_unlocked_ioctl,
-        .open =			hp_sdc_rtc_open,
-        .fasync =		hp_sdc_rtc_fasync,
-};
-
-static struct miscdevice hp_sdc_rtc_dev = {
-        .minor =	RTC_MINOR,
-        .name =		"rtc_HIL",
-        .fops =		&hp_sdc_rtc_fops
+static const struct rtc_class_ops hp_sdc_rtc_ops = {
+	.ioctl = hp_sdc_rtc_ioctl,
+	.proc = hp_sdc_rtc_proc,
+	.read_time = hp_sdc_rtc_get_time,
+	.set_time = hp_sdc_rtc_set_time,
+	.read_alarm = hp_sdc_rtc_read_alarm,
+	.set_alarm = hp_sdc_rtc_set_alarm,
+	// int (*alarm_irq_enable)(struct device *, unsigned int enabled);
 };
 
 static int __init hp_sdc_rtc_init(void)
 {
 	int ret;
+	struct rtc_time tm;
 
 #ifdef __mc68000__
 	if (!MACH_IS_HP300)
@@ -696,14 +577,22 @@ static int __init hp_sdc_rtc_init(void)
 
 	sema_init(&i8042tregs, 1);
 
+	/* check if BBRTC is available */
+	ret = hp_sdc_rtc_read_bbrtc(&tm);
+	if (ret) {
+		pr_info("hil-rtc: BBRTC not available.");
+		return -ENODEV;
+	}
+
 	if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr)))
 		return ret;
-	if (misc_register(&hp_sdc_rtc_dev) != 0)
-		printk(KERN_INFO "Could not register misc. dev for i8042 rtc\n");
 
-        proc_create_single("driver/rtc", 0, NULL, hp_sdc_rtc_proc_show);
+	rtc = devm_rtc_device_register(hp_sdc_get_sdc_device(),
+			"hil-rtc", &hp_sdc_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
 
-	printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support loaded "
+	pr_info("hil-rtc: HP i8042 SDC + MSM-58321 RTC support loaded "
 			 "(RTC v " RTC_VERSION ")\n");
 
 	return 0;
@@ -711,10 +600,9 @@ static int __init hp_sdc_rtc_init(void)
 
 static void __exit hp_sdc_rtc_exit(void)
 {
-	remove_proc_entry ("driver/rtc", NULL);
-        misc_deregister(&hp_sdc_rtc_dev);
+	devm_rtc_device_unregister(hp_sdc_get_sdc_device(), rtc);
 	hp_sdc_release_timer_irq(hp_sdc_rtc_isr);
-        printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n");
+	pr_info("hil-rtc: HP i8042 SDC + MSM-58321 RTC support unloaded\n");
 }
 
 module_init(hp_sdc_rtc_init);
diff --git a/drivers/input/serio/hp_sdc.c b/drivers/input/serio/hp_sdc.c
index 0b8a25c58d02..3e0ad6a4907f 100644
--- a/drivers/input/serio/hp_sdc.c
+++ b/drivers/input/serio/hp_sdc.c
@@ -110,6 +110,17 @@ MODULE_PARM_DESC(no_hpsdc, "Do not enable HP SDC driver.");
 
 static hp_i8042_sdc	hp_sdc;	/* All driver state is kept in here. */
 
+struct device *hp_sdc_get_sdc_device(void)
+{
+#if defined(__hppa__)
+	return &hp_sdc.dev->dev;
+#elif defined(__mc68000__)
+	/* hp_sdc.dev is 1, so return NULL instead. */
+	return NULL;
+#endif
+}
+EXPORT_SYMBOL(hp_sdc_get_sdc_device);
+
 /*************** primitives for use in any context *********************/
 static inline uint8_t hp_sdc_status_in8(void)
 {
diff --git a/include/linux/hp_sdc.h b/include/linux/hp_sdc.h
index 6f1dee7e67e0..8988e32adebd 100644
--- a/include/linux/hp_sdc.h
+++ b/include/linux/hp_sdc.h
@@ -298,4 +298,6 @@ typedef struct {
 
 } hp_i8042_sdc;
 
+struct device *hp_sdc_get_sdc_device(void);
+
 #endif /* _LINUX_HP_SDC_H */