511 lines
13 KiB
C
511 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* BYD TouchPad PS/2 mouse driver
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*
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* Copyright (C) 2015 Chris Diamand <chris@diamand.org>
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* Copyright (C) 2015 Richard Pospesel
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* Copyright (C) 2015 Tai Chi Minh Ralph Eastwood
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* Copyright (C) 2015 Martin Wimpress
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* Copyright (C) 2015 Jay Kuri
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*/
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/libps2.h>
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#include <linux/serio.h>
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#include <linux/slab.h>
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#include "psmouse.h"
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#include "byd.h"
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/* PS2 Bits */
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#define PS2_Y_OVERFLOW BIT_MASK(7)
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#define PS2_X_OVERFLOW BIT_MASK(6)
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#define PS2_Y_SIGN BIT_MASK(5)
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#define PS2_X_SIGN BIT_MASK(4)
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#define PS2_ALWAYS_1 BIT_MASK(3)
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#define PS2_MIDDLE BIT_MASK(2)
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#define PS2_RIGHT BIT_MASK(1)
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#define PS2_LEFT BIT_MASK(0)
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/*
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* BYD pad constants
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*/
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/*
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* True device resolution is unknown, however experiments show the
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* resolution is about 111 units/mm.
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* Absolute coordinate packets are in the range 0-255 for both X and Y
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* we pick ABS_X/ABS_Y dimensions which are multiples of 256 and in
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* the right ballpark given the touchpad's physical dimensions and estimate
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* resolution per spec sheet, device active area dimensions are
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* 101.6 x 60.1 mm.
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*/
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#define BYD_PAD_WIDTH 11264
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#define BYD_PAD_HEIGHT 6656
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#define BYD_PAD_RESOLUTION 111
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/*
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* Given the above dimensions, relative packets velocity is in multiples of
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* 1 unit / 11 milliseconds. We use this dt to estimate distance traveled
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*/
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#define BYD_DT 11
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/* Time in jiffies used to timeout various touch events (64 ms) */
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#define BYD_TOUCH_TIMEOUT msecs_to_jiffies(64)
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/* BYD commands reverse engineered from windows driver */
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/*
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* Swipe gesture from off-pad to on-pad
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* 0 : disable
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* 1 : enable
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*/
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#define BYD_CMD_SET_OFFSCREEN_SWIPE 0x10cc
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/*
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* Tap and drag delay time
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* 0 : disable
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* 1 - 8 : least to most delay
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*/
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#define BYD_CMD_SET_TAP_DRAG_DELAY_TIME 0x10cf
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/*
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* Physical buttons function mapping
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* 0 : enable
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* 4 : normal
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* 5 : left button custom command
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* 6 : right button custom command
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* 8 : disable
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*/
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#define BYD_CMD_SET_PHYSICAL_BUTTONS 0x10d0
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/*
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* Absolute mode (1 byte X/Y resolution)
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* 0 : disable
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* 2 : enable
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*/
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#define BYD_CMD_SET_ABSOLUTE_MODE 0x10d1
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/*
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* Two finger scrolling
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* 1 : vertical
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* 2 : horizontal
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* 3 : vertical + horizontal
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* 4 : disable
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*/
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#define BYD_CMD_SET_TWO_FINGER_SCROLL 0x10d2
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/*
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* Handedness
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* 1 : right handed
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* 2 : left handed
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*/
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#define BYD_CMD_SET_HANDEDNESS 0x10d3
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/*
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* Tap to click
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* 1 : enable
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* 2 : disable
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*/
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#define BYD_CMD_SET_TAP 0x10d4
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/*
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* Tap and drag
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* 1 : tap and hold to drag
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* 2 : tap and hold to drag + lock
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* 3 : disable
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*/
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#define BYD_CMD_SET_TAP_DRAG 0x10d5
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/*
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* Touch sensitivity
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* 1 - 7 : least to most sensitive
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*/
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#define BYD_CMD_SET_TOUCH_SENSITIVITY 0x10d6
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/*
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* One finger scrolling
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* 1 : vertical
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* 2 : horizontal
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* 3 : vertical + horizontal
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* 4 : disable
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*/
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#define BYD_CMD_SET_ONE_FINGER_SCROLL 0x10d7
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/*
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* One finger scrolling function
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* 1 : free scrolling
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* 2 : edge motion
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* 3 : free scrolling + edge motion
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* 4 : disable
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*/
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#define BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC 0x10d8
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/*
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* Sliding speed
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* 1 - 5 : slowest to fastest
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*/
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#define BYD_CMD_SET_SLIDING_SPEED 0x10da
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/*
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* Edge motion
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* 1 : disable
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* 2 : enable when dragging
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* 3 : enable when dragging and pointing
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*/
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#define BYD_CMD_SET_EDGE_MOTION 0x10db
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/*
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* Left edge region size
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* 0 - 7 : smallest to largest width
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*/
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#define BYD_CMD_SET_LEFT_EDGE_REGION 0x10dc
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/*
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* Top edge region size
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* 0 - 9 : smallest to largest height
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*/
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#define BYD_CMD_SET_TOP_EDGE_REGION 0x10dd
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/*
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* Disregard palm press as clicks
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* 1 - 6 : smallest to largest
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*/
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#define BYD_CMD_SET_PALM_CHECK 0x10de
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/*
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* Right edge region size
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* 0 - 7 : smallest to largest width
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*/
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#define BYD_CMD_SET_RIGHT_EDGE_REGION 0x10df
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/*
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* Bottom edge region size
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* 0 - 9 : smallest to largest height
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*/
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#define BYD_CMD_SET_BOTTOM_EDGE_REGION 0x10e1
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/*
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* Multitouch gestures
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* 1 : enable
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* 2 : disable
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*/
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#define BYD_CMD_SET_MULTITOUCH 0x10e3
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/*
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* Edge motion speed
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* 0 : control with finger pressure
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* 1 - 9 : slowest to fastest
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*/
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#define BYD_CMD_SET_EDGE_MOTION_SPEED 0x10e4
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/*
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* Two finger scolling function
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* 0 : free scrolling
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* 1 : free scrolling (with momentum)
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* 2 : edge motion
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* 3 : free scrolling (with momentum) + edge motion
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* 4 : disable
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*/
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#define BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC 0x10e5
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/*
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* The touchpad generates a mixture of absolute and relative packets, indicated
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* by the last byte of each packet being set to one of the following:
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*/
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#define BYD_PACKET_ABSOLUTE 0xf8
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#define BYD_PACKET_RELATIVE 0x00
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/* Multitouch gesture packets */
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#define BYD_PACKET_PINCH_IN 0xd8
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#define BYD_PACKET_PINCH_OUT 0x28
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#define BYD_PACKET_ROTATE_CLOCKWISE 0x29
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#define BYD_PACKET_ROTATE_ANTICLOCKWISE 0xd7
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#define BYD_PACKET_TWO_FINGER_SCROLL_RIGHT 0x2a
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#define BYD_PACKET_TWO_FINGER_SCROLL_DOWN 0x2b
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#define BYD_PACKET_TWO_FINGER_SCROLL_UP 0xd5
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#define BYD_PACKET_TWO_FINGER_SCROLL_LEFT 0xd6
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#define BYD_PACKET_THREE_FINGER_SWIPE_RIGHT 0x2c
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#define BYD_PACKET_THREE_FINGER_SWIPE_DOWN 0x2d
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#define BYD_PACKET_THREE_FINGER_SWIPE_UP 0xd3
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#define BYD_PACKET_THREE_FINGER_SWIPE_LEFT 0xd4
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#define BYD_PACKET_FOUR_FINGER_DOWN 0x33
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#define BYD_PACKET_FOUR_FINGER_UP 0xcd
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#define BYD_PACKET_REGION_SCROLL_RIGHT 0x35
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#define BYD_PACKET_REGION_SCROLL_DOWN 0x36
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#define BYD_PACKET_REGION_SCROLL_UP 0xca
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#define BYD_PACKET_REGION_SCROLL_LEFT 0xcb
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#define BYD_PACKET_RIGHT_CORNER_CLICK 0xd2
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#define BYD_PACKET_LEFT_CORNER_CLICK 0x2e
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#define BYD_PACKET_LEFT_AND_RIGHT_CORNER_CLICK 0x2f
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#define BYD_PACKET_ONTO_PAD_SWIPE_RIGHT 0x37
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#define BYD_PACKET_ONTO_PAD_SWIPE_DOWN 0x30
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#define BYD_PACKET_ONTO_PAD_SWIPE_UP 0xd0
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#define BYD_PACKET_ONTO_PAD_SWIPE_LEFT 0xc9
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struct byd_data {
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struct timer_list timer;
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struct psmouse *psmouse;
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s32 abs_x;
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s32 abs_y;
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typeof(jiffies) last_touch_time;
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bool btn_left;
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bool btn_right;
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bool touch;
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};
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static void byd_report_input(struct psmouse *psmouse)
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{
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struct byd_data *priv = psmouse->private;
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struct input_dev *dev = psmouse->dev;
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input_report_key(dev, BTN_TOUCH, priv->touch);
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input_report_key(dev, BTN_TOOL_FINGER, priv->touch);
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input_report_abs(dev, ABS_X, priv->abs_x);
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input_report_abs(dev, ABS_Y, priv->abs_y);
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input_report_key(dev, BTN_LEFT, priv->btn_left);
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input_report_key(dev, BTN_RIGHT, priv->btn_right);
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input_sync(dev);
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}
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static void byd_clear_touch(struct timer_list *t)
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{
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struct byd_data *priv = from_timer(priv, t, timer);
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struct psmouse *psmouse = priv->psmouse;
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serio_pause_rx(psmouse->ps2dev.serio);
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priv->touch = false;
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byd_report_input(psmouse);
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serio_continue_rx(psmouse->ps2dev.serio);
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/*
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* Move cursor back to center of pad when we lose touch - this
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* specifically improves user experience when moving cursor with one
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* finger, and pressing a button with another.
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*/
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priv->abs_x = BYD_PAD_WIDTH / 2;
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priv->abs_y = BYD_PAD_HEIGHT / 2;
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}
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static psmouse_ret_t byd_process_byte(struct psmouse *psmouse)
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{
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struct byd_data *priv = psmouse->private;
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u8 *pkt = psmouse->packet;
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if (psmouse->pktcnt > 0 && !(pkt[0] & PS2_ALWAYS_1)) {
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psmouse_warn(psmouse, "Always_1 bit not 1. pkt[0] = %02x\n",
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pkt[0]);
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return PSMOUSE_BAD_DATA;
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}
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if (psmouse->pktcnt < psmouse->pktsize)
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return PSMOUSE_GOOD_DATA;
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/* Otherwise, a full packet has been received */
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switch (pkt[3]) {
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case BYD_PACKET_ABSOLUTE:
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/* Only use absolute packets for the start of movement. */
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if (!priv->touch) {
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/* needed to detect tap */
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typeof(jiffies) tap_time =
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priv->last_touch_time + BYD_TOUCH_TIMEOUT;
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priv->touch = time_after(jiffies, tap_time);
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/* init abs position */
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priv->abs_x = pkt[1] * (BYD_PAD_WIDTH / 256);
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priv->abs_y = (255 - pkt[2]) * (BYD_PAD_HEIGHT / 256);
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}
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break;
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case BYD_PACKET_RELATIVE: {
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/* Standard packet */
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/* Sign-extend if a sign bit is set. */
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u32 signx = pkt[0] & PS2_X_SIGN ? ~0xFF : 0;
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u32 signy = pkt[0] & PS2_Y_SIGN ? ~0xFF : 0;
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s32 dx = signx | (int) pkt[1];
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s32 dy = signy | (int) pkt[2];
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/* Update position based on velocity */
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priv->abs_x += dx * BYD_DT;
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priv->abs_y -= dy * BYD_DT;
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priv->touch = true;
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break;
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}
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default:
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psmouse_warn(psmouse,
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"Unrecognized Z: pkt = %02x %02x %02x %02x\n",
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psmouse->packet[0], psmouse->packet[1],
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psmouse->packet[2], psmouse->packet[3]);
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return PSMOUSE_BAD_DATA;
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}
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priv->btn_left = pkt[0] & PS2_LEFT;
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priv->btn_right = pkt[0] & PS2_RIGHT;
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byd_report_input(psmouse);
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/* Reset time since last touch. */
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if (priv->touch) {
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priv->last_touch_time = jiffies;
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mod_timer(&priv->timer, jiffies + BYD_TOUCH_TIMEOUT);
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}
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return PSMOUSE_FULL_PACKET;
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}
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static int byd_reset_touchpad(struct psmouse *psmouse)
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{
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struct ps2dev *ps2dev = &psmouse->ps2dev;
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u8 param[4];
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size_t i;
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static const struct {
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u16 command;
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u8 arg;
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} seq[] = {
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/*
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* Intellimouse initialization sequence, to get 4-byte instead
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* of 3-byte packets.
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*/
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{ PSMOUSE_CMD_SETRATE, 0xC8 },
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{ PSMOUSE_CMD_SETRATE, 0x64 },
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{ PSMOUSE_CMD_SETRATE, 0x50 },
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{ PSMOUSE_CMD_GETID, 0 },
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{ PSMOUSE_CMD_ENABLE, 0 },
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/*
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* BYD-specific initialization, which enables absolute mode and
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* (if desired), the touchpad's built-in gesture detection.
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*/
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{ 0x10E2, 0x00 },
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{ 0x10E0, 0x02 },
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/* The touchpad should reply with 4 seemingly-random bytes */
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{ 0x14E0, 0x01 },
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/* Pairs of parameters and values. */
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{ BYD_CMD_SET_HANDEDNESS, 0x01 },
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{ BYD_CMD_SET_PHYSICAL_BUTTONS, 0x04 },
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{ BYD_CMD_SET_TAP, 0x02 },
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{ BYD_CMD_SET_ONE_FINGER_SCROLL, 0x04 },
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{ BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC, 0x04 },
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{ BYD_CMD_SET_EDGE_MOTION, 0x01 },
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{ BYD_CMD_SET_PALM_CHECK, 0x00 },
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{ BYD_CMD_SET_MULTITOUCH, 0x02 },
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{ BYD_CMD_SET_TWO_FINGER_SCROLL, 0x04 },
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{ BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC, 0x04 },
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{ BYD_CMD_SET_LEFT_EDGE_REGION, 0x00 },
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{ BYD_CMD_SET_TOP_EDGE_REGION, 0x00 },
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{ BYD_CMD_SET_RIGHT_EDGE_REGION, 0x00 },
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{ BYD_CMD_SET_BOTTOM_EDGE_REGION, 0x00 },
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{ BYD_CMD_SET_ABSOLUTE_MODE, 0x02 },
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/* Finalize initialization. */
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{ 0x10E0, 0x00 },
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{ 0x10E2, 0x01 },
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};
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for (i = 0; i < ARRAY_SIZE(seq); ++i) {
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memset(param, 0, sizeof(param));
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param[0] = seq[i].arg;
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if (ps2_command(ps2dev, param, seq[i].command))
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return -EIO;
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}
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psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
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return 0;
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}
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static int byd_reconnect(struct psmouse *psmouse)
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{
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int retry = 0, error = 0;
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psmouse_dbg(psmouse, "Reconnect\n");
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do {
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psmouse_reset(psmouse);
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if (retry)
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ssleep(1);
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error = byd_detect(psmouse, 0);
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} while (error && ++retry < 3);
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if (error)
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return error;
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psmouse_dbg(psmouse, "Reconnected after %d attempts\n", retry);
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error = byd_reset_touchpad(psmouse);
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if (error) {
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psmouse_err(psmouse, "Unable to initialize device\n");
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return error;
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}
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return 0;
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}
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static void byd_disconnect(struct psmouse *psmouse)
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{
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struct byd_data *priv = psmouse->private;
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if (priv) {
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del_timer(&priv->timer);
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kfree(psmouse->private);
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psmouse->private = NULL;
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}
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}
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int byd_detect(struct psmouse *psmouse, bool set_properties)
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{
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struct ps2dev *ps2dev = &psmouse->ps2dev;
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u8 param[4] = {0x03, 0x00, 0x00, 0x00};
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
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return -1;
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
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return -1;
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
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return -1;
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
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return -1;
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
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return -1;
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if (param[1] != 0x03 || param[2] != 0x64)
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return -ENODEV;
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psmouse_dbg(psmouse, "BYD touchpad detected\n");
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if (set_properties) {
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psmouse->vendor = "BYD";
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psmouse->name = "TouchPad";
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}
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return 0;
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}
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int byd_init(struct psmouse *psmouse)
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{
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struct input_dev *dev = psmouse->dev;
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struct byd_data *priv;
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if (psmouse_reset(psmouse))
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return -EIO;
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if (byd_reset_touchpad(psmouse))
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return -EIO;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->psmouse = psmouse;
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timer_setup(&priv->timer, byd_clear_touch, 0);
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psmouse->private = priv;
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psmouse->disconnect = byd_disconnect;
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psmouse->reconnect = byd_reconnect;
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psmouse->protocol_handler = byd_process_byte;
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psmouse->pktsize = 4;
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psmouse->resync_time = 0;
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__set_bit(INPUT_PROP_POINTER, dev->propbit);
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/* Touchpad */
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__set_bit(BTN_TOUCH, dev->keybit);
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__set_bit(BTN_TOOL_FINGER, dev->keybit);
|
|
/* Buttons */
|
|
__set_bit(BTN_LEFT, dev->keybit);
|
|
__set_bit(BTN_RIGHT, dev->keybit);
|
|
__clear_bit(BTN_MIDDLE, dev->keybit);
|
|
|
|
/* Absolute position */
|
|
__set_bit(EV_ABS, dev->evbit);
|
|
input_set_abs_params(dev, ABS_X, 0, BYD_PAD_WIDTH, 0, 0);
|
|
input_set_abs_params(dev, ABS_Y, 0, BYD_PAD_HEIGHT, 0, 0);
|
|
input_abs_set_res(dev, ABS_X, BYD_PAD_RESOLUTION);
|
|
input_abs_set_res(dev, ABS_Y, BYD_PAD_RESOLUTION);
|
|
/* No relative support */
|
|
__clear_bit(EV_REL, dev->evbit);
|
|
__clear_bit(REL_X, dev->relbit);
|
|
__clear_bit(REL_Y, dev->relbit);
|
|
|
|
return 0;
|
|
}
|