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linux/drivers/input/mouse/byd.c
Richard Pospesel 2d5f5611dd Input: byd - enable absolute mode 
The Windows driver's settings dialog contains a visualization of the
regions for the hardware edge scrolling capability, which uses a
temporarily-enabled limited-resolution absolute mode.

This patch enables this during normal operation, and combines the
absolute packets with the existing relative packets to provide
accurate absolute position and touch reporting.

It also adds documentation for all known gesture packets and
initialization commands.

Reviewed-by: Chris Diamand <chris@diamand.org>
Signed-off-by: Richard Pospesel <pospeselr@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2016-03-17 17:04:54 -07:00

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