feat: add evdev.uinput-device

Author: MunifTanjim

evdev/uinput-device.lua

@@ -0,0 +1,80 @@
+local ffi = require("ffi")
+
+local util = require("evdev.util")
+
+local libevdev_uinput = require("evdev.libevdev-uinput")
+local evdev_uinput_enum = libevdev_uinput.enum
+local evdev_uinput = libevdev_uinput.lib
+
+local libevdev_uinput_open_mode = evdev_uinput_enum.libevdev_uinput_open_mode
+
+---@class UInputDevice
+---@field device Device
+---@field uinput_dev ffi.cdata*
+local UInputDevice = {}
+
+---@param device Device
+---@param uinput_fd_or_pathname? number
+---@param flags? nil|number[]
+---@return UInputDevice
+local function init(class, device, uinput_fd_or_pathname, flags)
+  ---@type UInputDevice
+  local self = setmetatable({}, { __index = class })
+
+  local uinput_fd, fd_err = util.to_fd(uinput_fd_or_pathname, flags)
+  if fd_err then
+    return nil, fd_err
+  end
+
+  if not uinput_fd then
+    uinput_fd = libevdev_uinput_open_mode.MANAGED
+  end
+
+  local uinput_dev_ptr = libevdev_uinput.ctype.libevdev_uinput_ptr()
+
+  local rc = evdev_uinput.libevdev_uinput_create_from_device(device.dev, uinput_fd, uinput_dev_ptr)
+  if rc < 0 then
+    return nil, string.format("Error: %s", util.err_string(-rc))
+  end
+
+  self.device = device
+  self.uinput_dev = uinput_dev_ptr[0]
+
+  ffi.gc(self.uinput_dev, evdev_uinput.libevdev_uinput_destroy)
+
+  return self
+end
+
+---@param device Device
+---@param uinput_fd_or_pathname? number
+---@param flags? nil|number[]
+---@return UInputDevice
+function UInputDevice:new(device, uinput_fd_or_pathname, flags)
+  return init(self, device, uinput_fd_or_pathname, flags)
+end
+
+---@return number
+function UInputDevice:fd()
+  return evdev_uinput.libevdev_uinput_get_fd(self.uinput_dev)
+end
+
+---@return string
+function UInputDevice:syspath()
+  return util.to_string(evdev_uinput.libevdev_uinput_get_syspath(self.uinput_dev))
+end
+
+---@return string
+function UInputDevice:devnode()
+  return util.to_string(evdev_uinput.libevdev_uinput_get_devnode(self.uinput_dev))
+end
+
+---@param ev_type number
+---@param code number
+---@param value number
+---@return boolean success
+function UInputDevice:write_event(ev_type, code, value)
+  local rc = evdev_uinput.libevdev_uinput_write_event(self.uinput_dev, ev_type, code, value)
+  return rc == 0
+end
+
+return UInputDevice