linux-user: Add support for read/clear RTC voltage low detector using ioctls

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.

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Filip Bozuta <Filip.Bozuta@rt-rk.com>
Message-Id: <1579117007-7565-7-git-send-email-Filip.Bozuta@rt-rk.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 789764d113140df996e6a20f345b82e41a2bc128..73dcc761e642f772aa9b2c8c3108aae1497960ae 100644 (file)
--- 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 9f7aad49c6839681ee9745c10b95c9de85a3d250..9b61ae8547ddb90200924a3a39e5d0a1dc487c82 100644 (file)
--- 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)