[PATCH v2 for 5.0 2/6] linux-user: Add support for read/set RTC time and alarm using ioctls

[Filip Bozuta <Filip.Bozuta@rt-rk.com>]

This patch implements functionalities of following ioctls:

RTC_RD_TIME - Read RTC time

    Returns this RTC's time in the following structure:

        struct rtc_time {
            int tm_sec;
            int tm_min;
            int tm_hour;
            int tm_mday;
            int tm_mon;
            int tm_year;
            int tm_wday;     /* unused */
            int tm_yday;     /* unused */
            int tm_isdst;    /* unused */
        };

    The fields in this structure have the same meaning and ranges
    as for the tm structure described in gmtime man page.  A pointer
    to this structure should be passed as the third ioctl's argument.

RTC_SET_TIME - Set RTC time

    Sets this RTC's time to the time specified by the rtc_time
    structure pointed to by the third ioctl's argument.  To set
    the RTC's time the process must be privileged (i.e., have the
    CAP_SYS_TIME capability).

RTC_ALM_READ, RTC_ALM_SET - Read/Set alarm time

    Read and set the alarm time, for RTCs that support alarms.
    The alarm interrupt must be separately enabled or disabled
    using the RTC_AIE_ON, RTC_AIE_OFF requests.  The third
    ioctl's argument is a pointer to an rtc_time structure.  Only
    the tm_sec, tm_min, and tm_hour fields of this structure are
    used.

Implementation notes:

    All ioctls in this patch have pointer to a structure rtc_time
    as their third argument. That is the reason why corresponding
    definition is added in linux-user/syscall_types.h. Since all
    elements of this structure are of type 'int', the rest of the
    implementation is straightforward.

Signed-off-by: Filip Bozuta <Filip.Bozuta@rt-rk.com>
---
 linux-user/ioctls.h        |  4 ++++
 linux-user/syscall_defs.h  |  4 ++++
 linux-user/syscall_types.h | 11 +++++++++++
 3 files changed, 19 insertions(+)

diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 97741c7..f472794 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -77,6 +77,10 @@
      IOCTL(RTC_PIE_OFF, 0, TYPE_NULL)
      IOCTL(RTC_WIE_ON, 0, TYPE_NULL)
      IOCTL(RTC_WIE_OFF, 0, TYPE_NULL)
+     IOCTL(RTC_ALM_READ, IOC_R, MK_PTR(MK_STRUCT(STRUCT_rtc_time)))
+     IOCTL(RTC_ALM_SET, IOC_W, MK_PTR(MK_STRUCT(STRUCT_rtc_time)))
+     IOCTL(RTC_RD_TIME, IOC_R, MK_PTR(MK_STRUCT(STRUCT_rtc_time)))
+     IOCTL(RTC_SET_TIME, IOC_W, MK_PTR(MK_STRUCT(STRUCT_rtc_time)))
 
      IOCTL(BLKROSET, IOC_W, MK_PTR(TYPE_INT))
      IOCTL(BLKROGET, IOC_R, MK_PTR(TYPE_INT))
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index f91579a..f0bf09d 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -772,6 +772,10 @@ struct target_pollfd {
 #define TARGET_RTC_PIE_OFF          TARGET_IO('p', 0x06)
 #define TARGET_RTC_WIE_ON           TARGET_IO('p', 0x0f)
 #define TARGET_RTC_WIE_OFF          TARGET_IO('p', 0x10)
+#define TARGET_RTC_ALM_READ         TARGET_IOR('p', 0x08, struct rtc_time)
+#define TARGET_RTC_ALM_SET          TARGET_IOW('p', 0x07, struct rtc_time)
+#define TARGET_RTC_RD_TIME          TARGET_IOR('p', 0x09, struct rtc_time)
+#define TARGET_RTC_SET_TIME         TARGET_IOW('p', 0x0a, struct rtc_time)
 
 #if defined(TARGET_ALPHA) || defined(TARGET_MIPS) || defined(TARGET_SH4) ||    \
        defined(TARGET_XTENSA)
diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
index 4e36983..a35072a 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -255,6 +255,17 @@ STRUCT(blkpg_partition,
        MK_ARRAY(TYPE_CHAR, BLKPG_DEVNAMELTH), /* devname */
        MK_ARRAY(TYPE_CHAR, BLKPG_VOLNAMELTH)) /* volname */
 
+STRUCT(rtc_time,
+       TYPE_INT, /* tm_sec */
+       TYPE_INT, /* tm_min */
+       TYPE_INT, /* tm_hour */
+       TYPE_INT, /* tm_mday */
+       TYPE_INT, /* tm_mon */
+       TYPE_INT, /* tm_year */
+       TYPE_INT, /* tm_wday */
+       TYPE_INT, /* tm_yday */
+       TYPE_INT) /* tm_isdst */
+
 STRUCT(blkpg_ioctl_arg,
        TYPE_INT, /* op */
        TYPE_INT, /* flags */
-- 
2.7.4