diff options
Diffstat (limited to 'include/uapi/linux/input.h')
| -rw-r--r-- | include/uapi/linux/input.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h index 4f9f2a0f5573..2758687300b4 100644 --- a/include/uapi/linux/input.h +++ b/include/uapi/linux/input.h @@ -98,6 +98,12 @@ struct input_keymap_entry { __u8 scancode[32]; }; +struct input_mask { + __u32 type; + __u32 codes_size; + __u64 codes_ptr; +}; + #define EVIOCGVERSION _IOR('E', 0x01, int) /* get driver version */ #define EVIOCGID _IOR('E', 0x02, struct input_id) /* get device ID */ #define EVIOCGREP _IOR('E', 0x03, unsigned int[2]) /* get repeat settings */ @@ -155,6 +161,60 @@ struct input_keymap_entry { #define EVIOCGRAB _IOW('E', 0x90, int) /* Grab/Release device */ #define EVIOCREVOKE _IOW('E', 0x91, int) /* Revoke device access */ +/** + * EVIOCGMASK - Retrieve current event mask + * + * This ioctl allows user to retrieve the current event mask for specific + * event type. The argument must be of type "struct input_mask" and + * specifies the event type to query, the address of the receive buffer and + * the size of the receive buffer. + * + * The event mask is a per-client mask that specifies which events are + * forwarded to the client. Each event code is represented by a single bit + * in the event mask. If the bit is set, the event is passed to the client + * normally. Otherwise, the event is filtered and will never be queued on + * the client's receive buffer. + * + * Event masks do not affect global state of the input device. They only + * affect the file descriptor they are applied to. + * + * The default event mask for a client has all bits set, i.e. all events + * are forwarded to the client. If the kernel is queried for an unknown + * event type or if the receive buffer is larger than the number of + * event codes known to the kernel, the kernel returns all zeroes for those + * codes. + * + * At maximum, codes_size bytes are copied. + * + * This ioctl may fail with ENODEV in case the file is revoked, EFAULT + * if the receive-buffer points to invalid memory, or EINVAL if the kernel + * does not implement the ioctl. + */ +#define EVIOCGMASK _IOR('E', 0x92, struct input_mask) /* Get event-masks */ + +/** + * EVIOCSMASK - Set event mask + * + * This ioctl is the counterpart to EVIOCGMASK. Instead of receiving the + * current event mask, this changes the client's event mask for a specific + * type. See EVIOCGMASK for a description of event-masks and the + * argument-type. + * + * This ioctl provides full forward compatibility. If the passed event type + * is unknown to the kernel, or if the number of event codes specified in + * the mask is bigger than what is known to the kernel, the ioctl is still + * accepted and applied. However, any unknown codes are left untouched and + * stay cleared. That means, the kernel always filters unknown codes + * regardless of what the client requests. If the new mask doesn't cover + * all known event-codes, all remaining codes are automatically cleared and + * thus filtered. + * + * This ioctl may fail with ENODEV in case the file is revoked. EFAULT is + * returned if the receive-buffer points to invalid memory. EINVAL is returned + * if the kernel does not implement the ioctl. + */ +#define EVIOCSMASK _IOW('E', 0x93, struct input_mask) /* Set event-masks */ + #define EVIOCSCLOCKID _IOW('E', 0xa0, int) /* Set clockid to be used for timestamps */ /* |