[PATCH v3 for 5.0 4/6] linux-user: Add support for get/set RTC wakeup alarm using ioctls

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

This patch implements functionalities of following ioctls:

RTC_WKALM_SET, RTC_WKALM_GET - Get/Set wakeup alarm

    Some RTCs support a more powerful alarm interface, using these
    ioctls to read or write the RTC's alarm time (respectively)
    with this structure:

        struct rtc_wkalrm {
            unsigned char enabled;
            unsigned char pending;
            struct rtc_time time;
        };

    The enabled flag is used to enable or disable the alarm inter‐
    rupt, or to read its current status; when using these calls,
    RTC_AIE_ON and RTC_AIE_OFF are not used.  The pending flag is
    used by RTC_WKALM_RD to report a pending interrupt (so it's
    mostly useless on Linux, except when talking to the RTC man‐
    aged by EFI firmware).  The time field is as used with
    RTC_ALM_READ and RTC_ALM_SET except that the tm_mday, tm_mon,
    and tm_year fields are also valid.  A pointer to this struc‐
    ture should be passed as the third ioctl's argument.

Implementation notes:

    All ioctls in this patch have pointer to a structure rtc_wkalrm
    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 either of type 'unsigned char'
    or 'struct rtc_time' (that was covered in one of previous
    patches), the rest of the implementation is straightforward.

Signed-off-by: Filip Bozuta <Filip.Bozuta@rt-rk.com>
---
 linux-user/ioctls.h        | 2 ++
 linux-user/syscall_defs.h  | 2 ++
 linux-user/syscall_types.h | 5 +++++
 3 files changed, 9 insertions(+)

diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index accbdee..b09396e 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -85,6 +85,8 @@
      IOCTL(RTC_IRQP_SET, IOC_W, TYPE_ULONG)
      IOCTL(RTC_EPOCH_READ, IOC_R, MK_PTR(TYPE_ULONG))
      IOCTL(RTC_EPOCH_SET, IOC_W, TYPE_ULONG)
+     IOCTL(RTC_WKALM_RD, IOC_R, MK_PTR(MK_STRUCT(STRUCT_rtc_wkalrm)))
+     IOCTL(RTC_WKALM_SET, IOC_W, MK_PTR(MK_STRUCT(STRUCT_rtc_wkalrm)))
 
      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 bbfa935..37504a2 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -780,6 +780,8 @@ struct target_pollfd {
 #define TARGET_RTC_IRQP_SET         TARGET_IOW('p', 0x0c, abi_ulong)
 #define TARGET_RTC_EPOCH_READ       TARGET_IOR('p', 0x0d, abi_ulong)
 #define TARGET_RTC_EPOCH_SET        TARGET_IOW('p', 0x0e, abi_ulong)
+#define TARGET_RTC_WKALM_RD         TARGET_IOR('p', 0x10, struct rtc_wkalrm)
+#define TARGET_RTC_WKALM_SET        TARGET_IOW('p', 0x0f, struct rtc_wkalrm)
 
 #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 a35072a..820bc8e 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -266,6 +266,11 @@ STRUCT(rtc_time,
        TYPE_INT, /* tm_yday */
        TYPE_INT) /* tm_isdst */
 
+STRUCT(rtc_wkalrm,
+       TYPE_CHAR, /* enabled */
+       TYPE_CHAR, /* pending */
+       MK_STRUCT(STRUCT_rtc_time)) /* time */
+
 STRUCT(blkpg_ioctl_arg,
        TYPE_INT, /* op */
        TYPE_INT, /* flags */
-- 
2.7.4