linux-user: Add support for selected alsa timer instructions using ioctls

This patch implements functionalities of following ioctls:

SNDRV_TIMER_IOCTL_START - Start selected alsa timer

    Starts the timer device that is selected. The third ioctl's argument is
    ignored. Before calling this ioctl, the ioctl "SNDRV_TIMER_IOCTL_SELECT"
    should be called first to select the timer that is to be started. If no
    timer is selected, the error EBADFD ("File descriptor in bad shape")
    is returned.

SNDRV_TIMER_IOCTL_STOP - Stop selected alsa timer

    Stops the timer device that is selected. The third ioctl's argument is
    ignored. Before calling this ioctl, the ioctl "SNDRV_TIMER_IOCTL_SELECT"
    should be called first to select the timer that is to be stopped. If no
    timer is selected, the error EBADFD ("File descriptor in bad shape")
    is returned.

SNDRV_TIMER_IOCTL_CONTINUE - Continue selected alsa timer

    Continues the timer device that is selected. The third ioctl's argument is
    ignored. Before calling this ioctl, the ioctl "SNDRV_TIMER_IOCTL_SELECT"
    should be called first to select the timer that is to be continued. If no
    timer is selected, the error EBADFD ("File descriptor in bad shape")
    is returned.

SNDRV_TIMER_IOCTL_PAUSE - Pause selected alsa timer

    Pauses the timer device that is selected. The third ioctl's argument is
    ignored. Before calling this ioctl, the ioctl "SNDRV_TIMER_IOCTL_SELECT"
    should be called first to select the timer that is to be paused. If no
    timer is selected, the error EBADFD ("File descriptor in bad shape")
    is returned.

Implementation notes:

    Since all of the implemented ioctls have NULL as their 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: <1579117007-7565-13-git-send-email-Filip.Bozuta@rt-rk.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/ioctls.h

@@ -477,6 +477,10 @@
         MK_PTR(MK_STRUCT(STRUCT_snd_timer_params)))
   IOCTL(SNDRV_TIMER_IOCTL_STATUS, IOC_R,
         MK_PTR(MK_STRUCT(STRUCT_snd_timer_status)))
+  IOCTL(SNDRV_TIMER_IOCTL_START, 0, TYPE_NULL)
+  IOCTL(SNDRV_TIMER_IOCTL_STOP, 0, TYPE_NULL)
+  IOCTL(SNDRV_TIMER_IOCTL_CONTINUE, 0, TYPE_NULL)
+  IOCTL(SNDRV_TIMER_IOCTL_PAUSE, 0, TYPE_NULL)
 
   IOCTL(HDIO_GETGEO, IOC_R, MK_PTR(MK_STRUCT(STRUCT_hd_geometry)))
   IOCTL(HDIO_GET_UNMASKINTR, IOC_R, MK_PTR(TYPE_INT))

linux-user/syscall_defs.h

@@ -2516,6 +2516,10 @@ struct target_snd_timer_status {
                                                 struct snd_timer_params)
 #define TARGET_SNDRV_TIMER_IOCTL_STATUS       TARGET_IOR('T', 0x14,            \
                                                 struct target_snd_timer_status)
+#define TARGET_SNDRV_TIMER_IOCTL_START        TARGET_IO('T', 0xa0)
+#define TARGET_SNDRV_TIMER_IOCTL_STOP         TARGET_IO('T', 0xa1)
+#define TARGET_SNDRV_TIMER_IOCTL_CONTINUE     TARGET_IO('T', 0xa2)
+#define TARGET_SNDRV_TIMER_IOCTL_PAUSE        TARGET_IO('T', 0xa3)
 
 /* vfat ioctls */
 #define TARGET_VFAT_IOCTL_READDIR_BOTH    TARGET_IORU('r', 1)