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linux-stable/drivers/input/mouse/byd.c
Xiang wangx 652c0441de Input: byd - fix typo in a comment 
The double `the' in a comment is repeated, thus it should be removed.

Signed-off-by: Xiang wangx <wangxiang@cdjrlc.com>
Link: https://lore.kernel.org/r/20211216082735.11948-1-wangxiang@cdjrlc.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2021-12-20 00:59:50 -08:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* BYD TouchPad PS/2 mouse driver
*
* Copyright (C) 2015 Chris Diamand <chris@diamand.org>
* Copyright (C) 2015 Richard Pospesel
* Copyright (C) 2015 Tai Chi Minh Ralph Eastwood
* Copyright (C) 2015 Martin Wimpress
* Copyright (C) 2015 Jay Kuri
*/
#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 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;
struct psmouse *psmouse;
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(struct timer_list *t)
{
struct byd_data *priv = from_timer(priv, t, timer);
struct psmouse *psmouse = priv->psmouse;
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;
static 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;
priv->psmouse = psmouse;
timer_setup(&priv->timer, byd_clear_touch, 0);
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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