[SPARC]: Provide generic ioctls in Sparc RTC driver.

Provide support for drivers/char/rtc.c ioctls in the
Mostek rtc driver as well as the Sparc specific RTCGET
and RTCSET.

This allows userspace to be much less messy.  Currently
util-linux and other spots jump through hoops trying
various ioctl variants until it hits the right one whatever
driver actually being used supports.

Eventually all of this should move over to the genrtc.c
driver, but not today...

While we are here, fix up the register types for sparse.

Thanks to Frans Pop for helping point out this issue.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 99 insertions, 4 deletions

diff --git a/drivers/sbus/char/rtc.c b/drivers/sbus/char/rtc.c
index bf3273eb1c8b..49d1cd99d5ac 100644
--- a/drivers/sbus/char/rtc.c
+++ b/drivers/sbus/char/rtc.c
@@ -28,6 +28,42 @@
 
 static int rtc_busy = 0;
 
+/* This is the structure layout used by drivers/char/rtc.c, we
+ * support that driver's ioctls so that things are less messy in
+ * userspace.
+ */
+struct rtc_time_generic {
+        int tm_sec;
+        int tm_min;
+        int tm_hour;
+        int tm_mday;
+        int tm_mon;
+        int tm_year;
+        int tm_wday;
+        int tm_yday;
+        int tm_isdst;
+};
+#define RTC_AIE_ON      _IO('p', 0x01)  /* Alarm int. enable on         */
+#define RTC_AIE_OFF     _IO('p', 0x02)  /* ... off                      */
+#define RTC_UIE_ON      _IO('p', 0x03)  /* Update int. enable on        */
+#define RTC_UIE_OFF     _IO('p', 0x04)  /* ... off                      */
+#define RTC_PIE_ON      _IO('p', 0x05)  /* Periodic int. enable on      */
+#define RTC_PIE_OFF     _IO('p', 0x06)  /* ... off                      */
+#define RTC_WIE_ON      _IO('p', 0x0f)  /* Watchdog int. enable on      */
+#define RTC_WIE_OFF     _IO('p', 0x10)  /* ... off                      */
+#define RTC_RD_TIME     _IOR('p', 0x09, struct rtc_time_generic) /* Read RTC time   */
+#define RTC_SET_TIME    _IOW('p', 0x0a, struct rtc_time_generic) /* Set RTC time    */
+#define RTC_ALM_SET     _IOW('p', 0x07, struct rtc_time) /* Set alarm time  */
+#define RTC_ALM_READ    _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
+#define RTC_IRQP_READ   _IOR('p', 0x0b, unsigned long)   /* Read IRQ rate   */
+#define RTC_IRQP_SET    _IOW('p', 0x0c, unsigned long)   /* Set IRQ rate    */
+#define RTC_EPOCH_READ  _IOR('p', 0x0d, unsigned long)   /* Read epoch      */
+#define RTC_EPOCH_SET   _IOW('p', 0x0e, unsigned long)   /* Set epoch       */
+#define RTC_WKALM_SET   _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
+#define RTC_WKALM_RD    _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
+#define RTC_PLL_GET     _IOR('p', 0x11, struct rtc_pll_info)  /* Get PLL correction */
+#define RTC_PLL_SET     _IOW('p', 0x12, struct rtc_pll_info)  /* Set PLL correction */
+
 /* Retrieve the current date and time from the real time clock. */
 static void get_rtc_time(struct rtc_time *t)
 {
@@ -82,29 +118,87 @@ void set_rtc_time(struct rtc_time *t)
         spin_unlock_irq(&mostek_lock);
 }
 
+static int put_rtc_time_generic(void __user *argp, struct rtc_time *tm)
+{
+        struct rtc_time_generic __user *utm = argp;
+
+        if (__put_user(tm->sec, &utm->tm_sec) ||
+            __put_user(tm->min, &utm->tm_min) ||
+            __put_user(tm->hour, &utm->tm_hour) ||
+            __put_user(tm->dom, &utm->tm_mday) ||
+            __put_user(tm->month, &utm->tm_mon) ||
+            __put_user(tm->year, &utm->tm_year) ||
+            __put_user(tm->dow, &utm->tm_wday) ||
+            __put_user(0, &utm->tm_yday) ||
+            __put_user(0, &utm->tm_isdst))
+                return -EFAULT;
+
+        return 0;
+}
+
+static int get_rtc_time_generic(struct rtc_time *tm, void __user *argp)
+{
+        struct rtc_time_generic __user *utm = argp;
+
+        if (__get_user(tm->sec, &utm->tm_sec) ||
+            __get_user(tm->min, &utm->tm_min) ||
+            __get_user(tm->hour, &utm->tm_hour) ||
+            __get_user(tm->dom, &utm->tm_mday) ||
+            __get_user(tm->month, &utm->tm_mon) ||
+            __get_user(tm->year, &utm->tm_year) ||
+            __get_user(tm->dow, &utm->tm_wday))
+                return -EFAULT;
+
+        return 0;
+}
+
 static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
         unsigned long arg)
 {
         struct rtc_time rtc_tm;
         void __user *argp = (void __user *)arg;
 
-        switch (cmd)
-        {
+        switch (cmd) {
+        /* No interrupt support, return an error
+         * compatible with drivers/char/rtc.c
+         */
+        case RTC_AIE_OFF:
+        case RTC_AIE_ON:
+        case RTC_PIE_OFF:
+        case RTC_PIE_ON:
+        case RTC_UIE_OFF:
+        case RTC_UIE_ON:
+        case RTC_IRQP_READ:
+        case RTC_IRQP_SET:
+        case RTC_EPOCH_SET:
+        case RTC_EPOCH_READ:
+                return -EINVAL;
+
         case RTCGET:
+        case RTC_RD_TIME:
                 memset(&rtc_tm, 0, sizeof(struct rtc_time));
                 get_rtc_time(&rtc_tm);
 
-                if (copy_to_user(argp, &rtc_tm, sizeof(struct rtc_time)))
+                if (cmd == RTCGET) {
+                        if (copy_to_user(argp, &rtc_tm,
+                                         sizeof(struct rtc_time)))
+                                return -EFAULT;
+                } else if (put_rtc_time_generic(argp, &rtc_tm))
                         return -EFAULT;
 
                 return 0;
 
 
         case RTCSET:
+        case RTC_SET_TIME:
                 if (!capable(CAP_SYS_TIME))
                         return -EPERM;
 
-                if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
+                if (cmd == RTCSET) {
+                        if (copy_from_user(&rtc_tm, argp,
+                                           sizeof(struct rtc_time)))
+                                return -EFAULT;
+                } else if (get_rtc_time_generic(&rtc_tm, argp))
                         return -EFAULT;
 
                 set_rtc_time(&rtc_tm);
@@ -164,6 +258,7 @@ static int __init rtc_sun_init(void)
                 printk(KERN_ERR "rtc: unable to get misc minor for Mostek\n");
                 return error;
         }
+        printk("rtc_sun_init: Registered Mostek RTC driver.\n");
 
         return 0;
 }