[PATCH 06/12] linux-user: Add support for read/clear RTC voltage low detector using ioctls

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

This patch implements functionalities of following ioctls:

RTC_VL_READ - Read voltage low detection information

    Read the voltage low for RTCs that support voltage low.
    The third ioctl's' argument points to an int in which
    the voltage low is returned.

RTC_VL_CLR - Clear voltage low information

    Clear the information about voltage low for RTCs that
    support voltage low. The third ioctl(2) argument is
    ignored.

Implementation notes:

    Since one ioctl has a pointer to 'int' as its third agrument,
    and another ioctl has NULL as its third argument, their
    implementation was straightforward.

Signed-off-by: Filip Bozuta <Filip.Bozuta@rt-rk.com>
---
 linux-user/ioctls.h       | 2 ++
 linux-user/syscall_defs.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 0a4e3f1..1f1f3e6 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -89,6 +89,8 @@
      IOCTL(RTC_WKALM_SET, IOC_W, MK_PTR(MK_STRUCT(STRUCT_rtc_wkalrm)))
      IOCTL(RTC_PLL_GET, IOC_R, MK_PTR(MK_STRUCT(STRUCT_rtc_pll_info)))
      IOCTL(RTC_PLL_SET, IOC_W, MK_PTR(MK_STRUCT(STRUCT_rtc_pll_info)))
+     IOCTL(RTC_VL_READ, IOC_R, MK_PTR(TYPE_INT))
+     IOCTL(RTC_VL_CLR, 0, TYPE_NULL)
 
      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 8370f41..af4f366 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -796,6 +796,8 @@ struct target_rtc_pll_info {
                                                struct target_rtc_pll_info)
 #define TARGET_RTC_PLL_SET          TARGET_IOW('p', 0x12,                      \
                                                struct target_rtc_pll_info)
+#define TARGET_RTC_VL_READ          TARGET_IOR('p', 0x13, int)
+#define TARGET_RTC_VL_CLR           TARGET_IO('p', 0x14)
 
 #if defined(TARGET_ALPHA) || defined(TARGET_MIPS) || defined(TARGET_SH4) ||    \
        defined(TARGET_XTENSA)
-- 
2.7.4