156 lines
5.4 KiB
PHP
156 lines
5.4 KiB
PHP
; HID mouse driver, part of USBHID driver.
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; Global constants.
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; They are assembled in a macro to separate code and data;
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; the code is located at the point of "include 'mouse.inc'",
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; the data are collected when workers_globals is instantiated.
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macro workers_globals
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{
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; include global constants from previous workers
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workers_globals
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align 4
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; Callbacks for HID layer.
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mouse_driver:
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dd mouse_driver_add_device
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dd mouse_driver_disconnect
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dd mouse_driver_begin_packet
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dd mouse_driver_array_overflow?
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dd mouse_driver_input_field
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dd mouse_driver_end_packet
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}
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; Data that are specific for one mouse device.
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struct mouse_device_data
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buttons dd ? ; buttons that are currently pressed
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dx dd ? ; current x moving
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dy dd ? ; current y moving
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wheel dd ? ; current wheel moving
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hwheel dd ?
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ends
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; This procedure is called when HID layer detects a new mouse.
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; in: ebx -> device_data from USB layer, edi -> collection
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; out: eax = device-specific data or NULL on error
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proc mouse_driver_add_device
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; Just allocate memory; no initialization needed.
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movi eax, sizeof.mouse_device_data
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call Kmalloc
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ret
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endp
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; This procedure is called when HID layer detects disconnect of a previously
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; connected mouse.
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; in: edi -> mouse_device_data (pointer returned from mouse_driver_add_device)
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proc mouse_driver_disconnect
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; Free the allocated memory.
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mov eax, edi
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call Kfree
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ret
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endp
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; This procedure is called when HID layer starts processing a new input packet
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; from a mouse.
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; in: edi -> mouse_device_data (pointer returned from mouse_driver_add_device)
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proc mouse_driver_begin_packet
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; Zero all variables describing the current state.
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mov [edi+mouse_device_data.buttons], 0
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mov [edi+mouse_device_data.dx], 0
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mov [edi+mouse_device_data.dy], 0
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mov [edi+mouse_device_data.wheel], 0
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mov [edi+mouse_device_data.hwheel], 0
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ret
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endp
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; This procedure is called when HID layer processes every non-empty array field group.
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; in: edi -> mouse_device_data (pointer returned from mouse_driver_add_device)
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; in: ecx = fields count (always nonzero), edx = pointer to fields values
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; in: esi -> report_field_group
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; out: CF set => array is ok, CF cleared => array should be ignored
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proc mouse_driver_array_overflow?
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; no array fields, no overflows
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stc
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ret
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endp
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; This procedure is called from HID layer for every field.
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; in: edi -> mouse_device_data (pointer returned from mouse_driver_add_device)
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; in: ecx = field usage, edx = value, esi -> report_field_group
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proc mouse_driver_input_field
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; 1. Determine the handler. We process x/y moving, wheel and up to 32 buttons.
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; Pass other fields to the default handler - default_driver_input_field if
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; HID_DUMP_UNCLAIMED is enabled, just ignore otherwise.
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cmp ecx, USAGE_GD_X
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jz .x
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cmp ecx, USAGE_GD_Y
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jz .y
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cmp ecx, USAGE_GD_WHEEL
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jz .wheel
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cmp ecx, 0xC0238
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jz .hwheel
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sub ecx, USAGE_BUTTON_PAGE + 1
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jb .unclaimed
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cmp ecx, 32
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jae .unclaimed
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; 2. This is a button.
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; If a button is pressed, set the corresponding bit in the state.
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; If a button is not pressed, do nothing.
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test edx, edx
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jz @f
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bts [edi+mouse_device_data.buttons], ecx
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@@:
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if ~HID_DUMP_UNCLAIMED
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.unclaimed:
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end if
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ret
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if HID_DUMP_UNCLAIMED
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.unclaimed:
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add ecx, USAGE_BUTTON_PAGE + 1
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jmp default_driver_input_field
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end if
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.x:
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; 3. This is x moving. For relative fields, store the value in the state.
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; Pass absolute field to the default handler.
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test byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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jz .unclaimed
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mov [edi+mouse_device_data.dx], edx
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ret
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.y:
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; 4. This is y moving. For relative fields, store the value in the state,
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; changing the sign: HID uses "mathematics" scheme with Y axis increasing from
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; bottom to top, the kernel expects "programming" PS/2-style with Y axis
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; increasing from top to bottom.
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; Pass absolute fields to the default handler.
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test byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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jz .unclaimed
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neg edx
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mov [edi+mouse_device_data.dy], edx
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ret
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.wheel:
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; 5. This is wheel event. For relative fields, store the value in the state,
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; changing the sign. Pass absolute fields to the default handler.
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test byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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jz .unclaimed
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neg edx
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mov [edi+mouse_device_data.wheel], edx
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ret
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.hwheel:
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test byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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jz .unclaimed
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mov [edi+mouse_device_data.hwheel], edx
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ret
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endp
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; This procedure is called when HID layer ends processing a new input packet
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; from a mouse.
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; in: edi -> mouse_device_data (pointer returned from mouse_driver_add_device)
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proc mouse_driver_end_packet
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; Call the kernel, passing collected state.
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stdcall SetMouseData, \
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[edi+mouse_device_data.buttons], \
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[edi+mouse_device_data.dx], \
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[edi+mouse_device_data.dy], \
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[edi+mouse_device_data.wheel], \
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[edi+mouse_device_data.hwheel]
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ret
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endp
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