[v8,04/13] linux-user: Add support for getting/setting RTC wakeup alarm using ioctls

This patch implements functionalities of following ioctls:

RTC_WKALM_SET, RTC_WKALM_GET - Getting/Setting 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
    interrupt, 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 managed 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 structure
    should be passed as the third ioctl's argument.

Implementation notes:

    All ioctls in this patch have a 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.

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
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(+)

Le 15/01/2020 à 20:36, Filip Bozuta a écrit :
> This patch implements functionalities of following ioctls:
> 
> RTC_WKALM_SET, RTC_WKALM_GET - Getting/Setting 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
>     interrupt, 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 managed 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 structure
>     should be passed as the third ioctl's argument.
> 
> Implementation notes:
> 
>     All ioctls in this patch have a 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.
> 
> Reviewed-by: Laurent Vivier <laurent@vivier.eu>
> 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 */
> 

Applied to my linux-user branch.

Thanks,
Laurent