T-Kernel Specification (1.B0.02)

5.3. DEVICE MANAGEMENT FUNCTIONS 245
See the screen driver specification for details.
5.3.6 Device Event Notification
A device driver sends events occurring in devices to the event notification message buffer (TDN EVENT)
as device event notification. The system default event notification message buffer is designated at the
time of device registration, but can be changed later. The system default event notification message
buffer is defined in TDEvtMbfSz in system configuration information.
The following event types are defined.
typedef enum tdevttyp {
TDE_unknown = 0, /* undefined */
TDE_MOUNT = 0x01, /* media mounted */
TDE_EJECT = 0x02, /* media ejected */
TDE_ILLMOUNT = 0x03, /* media illegally mounted */
TDE_ILLEJECT = 0x04, /* media illegally ejected */
TDE_REMOUNT = 0x05, /* media remounted */
TDE_CARDBATLOW = 0x06, /* card battery alarm */
TDE_CARDBATFAIL = 0x07, /* card battery failure */
TDE_REQEJECT = 0x08, /* media eject request */
TDE_PDBUT = 0x11, /* PD button state change */
TDE_PDMOVE = 0x12, /* PD move */
TDE_PDSTATE = 0x13, /* PD state change */
TDE_PDEXT = 0x14, /* PD extended event */
TDE_KEYDOWN = 0x21, /* key down */
TDE_KEYUP = 0x22, /* key up */
TDE_KEYMETA = 0x23, /* meta key state change */
TDE_POWEROFF = 0x31, /* power switch off */
TDE_POWERLOW = 0x32, /* low power alarm */
TDE_POWERFAIL = 0x33, /* power failure */
TDE_POWERSUS = 0x34, /* auto suspend */
TDE_POWERUPTM = 0x35, /* clock update */
TDE_CKPWON = 0x41 /* auto power on notification */
} TDEvtTyp;
Device events are notified in the following format. The contents of event notification and size differ with
each event type.
typedef struct t_devevt {
TDEvtTyp evttyp; /* event type */
/* Information specific to each event type is appended here. */
} T_DEVEVT;
The format of device event notification with device ID is as follows.
typedef struct t_devevt_id {
TDEvtTyp evttyp; /* event type */
ID devid; /* device ID */
/* Information specific to each event type is appended here. */
} T_DEVEVT_ID;
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T-Kernel 1.B0.02