Input: byd - add BYD PS/2 touchpad driver

Driver for the BYD BTP10463 touchpad, found in PC Specialist `Lafite'
laptops. This patch sends the magic command sequence which causes the
touchpad to stream intellimouse-style packets.

Gestures are detected inside the touchpad, and exposed as special
values in the Z component of each packet - absolute coordinates are
not supported, even in the Windows driver. At present, this supports
two-finger vertical and horizontal scrolling, and provides the
framework to expose the other gestures it can recognize.

Signed-off-by: Chris Diamand <chris@diamand.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Chris Diamand 2016-01-27 17:04:35 -08:00 committed by Dmitry Torokhov
parent 8fb81d2001
commit 98ee377144
6 changed files with 381 additions and 0 deletions

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@ -48,6 +48,16 @@ config MOUSE_PS2_ALPS
If unsure, say Y.
config MOUSE_PS2_BYD
bool "BYD PS/2 mouse protocol extension" if EXPERT
default y
depends on MOUSE_PS2
help
Say Y here if you have a BYD PS/2 touchpad connected to
your system.
If unsure, say Y.
config MOUSE_PS2_LOGIPS2PP
bool "Logitech PS/2++ mouse protocol extension" if EXPERT
default y

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@ -28,6 +28,7 @@ cyapatp-objs := cyapa.o cyapa_gen3.o cyapa_gen5.o cyapa_gen6.o
psmouse-objs := psmouse-base.o synaptics.o focaltech.o
psmouse-$(CONFIG_MOUSE_PS2_ALPS) += alps.o
psmouse-$(CONFIG_MOUSE_PS2_BYD) += byd.o
psmouse-$(CONFIG_MOUSE_PS2_ELANTECH) += elantech.o
psmouse-$(CONFIG_MOUSE_PS2_OLPC) += hgpk.o
psmouse-$(CONFIG_MOUSE_PS2_LOGIPS2PP) += logips2pp.o

337
drivers/input/mouse/byd.c Normal file
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@ -0,0 +1,337 @@
/*
* 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 "psmouse.h"
#include "byd.h"
#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)
/*
* The touchpad reports gestures in the last byte of each packet. It can take
* any of the following values:
*/
/* One-finger scrolling in one of the edge scroll zones. */
#define BYD_SCROLLUP 0xCA
#define BYD_SCROLLDOWN 0x36
#define BYD_SCROLLLEFT 0xCB
#define BYD_SCROLLRIGHT 0x35
/* Two-finger scrolling. */
#define BYD_2DOWN 0x2B
#define BYD_2UP 0xD5
#define BYD_2LEFT 0xD6
#define BYD_2RIGHT 0x2A
/* Pinching in or out. */
#define BYD_ZOOMOUT 0xD8
#define BYD_ZOOMIN 0x28
/* Three-finger swipe. */
#define BYD_3UP 0xD3
#define BYD_3DOWN 0x2D
#define BYD_3LEFT 0xD4
#define BYD_3RIGHT 0x2C
/* Four-finger swipe. */
#define BYD_4UP 0xCD
#define BYD_4DOWN 0x33
int byd_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[4];
param[0] = 0x03;
param[1] = 0x00;
param[2] = 0x00;
param[3] = 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;
}
static psmouse_ret_t byd_process_byte(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
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 0: {
/* Standard packet */
/* Sign-extend if a sign bit is set. */
unsigned int signx = pkt[0] & PS2_X_SIGN ? ~0xFF : 0;
unsigned int signy = pkt[0] & PS2_Y_SIGN ? ~0xFF : 0;
int dx = signx | (int) pkt[1];
int dy = signy | (int) pkt[2];
input_report_rel(psmouse->dev, REL_X, dx);
input_report_rel(psmouse->dev, REL_Y, -dy);
input_report_key(psmouse->dev, BTN_LEFT, pkt[0] & PS2_LEFT);
input_report_key(psmouse->dev, BTN_RIGHT, pkt[0] & PS2_RIGHT);
input_report_key(psmouse->dev, BTN_MIDDLE, pkt[0] & PS2_MIDDLE);
break;
}
case BYD_SCROLLDOWN:
case BYD_2DOWN:
input_report_rel(dev, REL_WHEEL, -1);
break;
case BYD_SCROLLUP:
case BYD_2UP:
input_report_rel(dev, REL_WHEEL, 1);
break;
case BYD_SCROLLLEFT:
case BYD_2LEFT:
input_report_rel(dev, REL_HWHEEL, -1);
break;
case BYD_SCROLLRIGHT:
case BYD_2RIGHT:
input_report_rel(dev, REL_HWHEEL, 1);
break;
case BYD_ZOOMOUT:
case BYD_ZOOMIN:
case BYD_3UP:
case BYD_3DOWN:
case BYD_3LEFT:
case BYD_3RIGHT:
case BYD_4UP:
case BYD_4DOWN:
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;
}
input_sync(dev);
return PSMOUSE_FULL_PACKET;
}
/* Send a sequence of bytes, where each is ACKed before the next is sent. */
static int byd_send_sequence(struct psmouse *psmouse, const u8 *seq, size_t len)
{
unsigned int i;
for (i = 0; i < len; ++i) {
if (ps2_command(&psmouse->ps2dev, NULL, seq[i]))
return -1;
}
return 0;
}
/* Keep scrolling after fingers are removed. */
#define SCROLL_INERTIAL 0x01
#define SCROLL_NO_INERTIAL 0x02
/* Clicking can be done by tapping or pressing. */
#define CLICK_BOTH 0x01
/* Clicking can only be done by pressing. */
#define CLICK_PRESS_ONLY 0x02
static int byd_enable(struct psmouse *psmouse)
{
const u8 seq1[] = { 0xE2, 0x00, 0xE0, 0x02, 0xE0 };
const u8 seq2[] = {
0xD3, 0x01,
0xD0, 0x00,
0xD0, 0x04,
/* Whether clicking is done by tapping or pressing. */
0xD4, CLICK_PRESS_ONLY,
0xD5, 0x01,
0xD7, 0x03,
/* Vertical and horizontal one-finger scroll zone inertia. */
0xD8, SCROLL_INERTIAL,
0xDA, 0x05,
0xDB, 0x02,
0xE4, 0x05,
0xD6, 0x01,
0xDE, 0x04,
0xE3, 0x01,
0xCF, 0x00,
0xD2, 0x03,
/* Vertical and horizontal two-finger scrolling inertia. */
0xE5, SCROLL_INERTIAL,
0xD9, 0x02,
0xD9, 0x07,
0xDC, 0x03,
0xDD, 0x03,
0xDF, 0x03,
0xE1, 0x03,
0xD1, 0x00,
0xCE, 0x00,
0xCC, 0x00,
0xE0, 0x00,
0xE2, 0x01
};
u8 param[4];
if (byd_send_sequence(psmouse, seq1, ARRAY_SIZE(seq1)))
return -1;
/* Send a 0x01 command, which should return 4 bytes. */
if (ps2_command(&psmouse->ps2dev, param, 0x0401))
return -1;
if (byd_send_sequence(psmouse, seq2, ARRAY_SIZE(seq2)))
return -1;
return 0;
}
/*
* Send the set of PS/2 commands required to make it identify as an
* intellimouse with 4-byte instead of 3-byte packets.
*/
static int byd_send_intellimouse_sequence(struct psmouse *psmouse)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
u8 param[4];
int i;
const struct {
u16 command;
u8 arg;
} seq[] = {
{ PSMOUSE_CMD_RESET_BAT, 0 },
{ PSMOUSE_CMD_RESET_BAT, 0 },
{ PSMOUSE_CMD_GETID, 0 },
{ PSMOUSE_CMD_SETSCALE11, 0 },
{ PSMOUSE_CMD_SETSCALE11, 0 },
{ PSMOUSE_CMD_SETSCALE11, 0 },
{ PSMOUSE_CMD_GETINFO, 0 },
{ PSMOUSE_CMD_SETRES, 0x03 },
{ PSMOUSE_CMD_SETRATE, 0xC8 },
{ PSMOUSE_CMD_SETRATE, 0x64 },
{ PSMOUSE_CMD_SETRATE, 0x50 },
{ PSMOUSE_CMD_GETID, 0 },
{ PSMOUSE_CMD_SETRATE, 0xC8 },
{ PSMOUSE_CMD_SETRATE, 0xC8 },
{ PSMOUSE_CMD_SETRATE, 0x50 },
{ PSMOUSE_CMD_GETID, 0 },
{ PSMOUSE_CMD_SETRATE, 0x64 },
{ PSMOUSE_CMD_SETRES, 0x03 },
{ PSMOUSE_CMD_ENABLE, 0 }
};
memset(param, 0, sizeof(param));
for (i = 0; i < ARRAY_SIZE(seq); ++i) {
param[0] = seq[i].arg;
if (ps2_command(ps2dev, param, seq[i].command))
return -1;
}
return 0;
}
static int byd_reset_touchpad(struct psmouse *psmouse)
{
if (byd_send_intellimouse_sequence(psmouse))
return -EIO;
if (byd_enable(psmouse))
return -EIO;
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;
}
int byd_init(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
if (psmouse_reset(psmouse))
return -EIO;
if (byd_reset_touchpad(psmouse))
return -EIO;
psmouse->reconnect = byd_reconnect;
psmouse->protocol_handler = byd_process_byte;
psmouse->pktsize = 4;
psmouse->resync_time = 0;
__set_bit(BTN_MIDDLE, dev->keybit);
__set_bit(REL_WHEEL, dev->relbit);
__set_bit(REL_HWHEEL, dev->relbit);
return 0;
}

18
drivers/input/mouse/byd.h Normal file
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@ -0,0 +1,18 @@
#ifndef _BYD_H
#define _BYD_H
#ifdef CONFIG_MOUSE_PS2_BYD
int byd_detect(struct psmouse *psmouse, bool set_properties);
int byd_init(struct psmouse *psmouse);
#else
static inline int byd_detect(struct psmouse *psmouse, bool set_properties)
{
return -ENOSYS;
}
static inline int byd_init(struct psmouse *psmouse)
{
return -ENOSYS;
}
#endif /* CONFIG_MOUSE_PS2_BYD */
#endif /* _BYD_H */

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@ -37,6 +37,7 @@
#include "cypress_ps2.h"
#include "focaltech.h"
#include "vmmouse.h"
#include "byd.h"
#define DRIVER_DESC "PS/2 mouse driver"
@ -841,6 +842,15 @@ static const struct psmouse_protocol psmouse_protocols[] = {
.detect = vmmouse_detect,
.init = vmmouse_init,
},
#endif
#ifdef CONFIG_MOUSE_PS2_BYD
{
.type = PSMOUSE_BYD,
.name = "BydPS/2",
.alias = "byd",
.detect = byd_detect,
.init = byd_init,
},
#endif
{
.type = PSMOUSE_AUTO,
@ -1105,6 +1115,10 @@ static int psmouse_extensions(struct psmouse *psmouse,
if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
&max_proto, set_properties, true))
return PSMOUSE_TOUCHKIT_PS2;
if (psmouse_try_protocol(psmouse, PSMOUSE_BYD,
&max_proto, set_properties, true))
return PSMOUSE_BYD;
}
/*

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@ -104,6 +104,7 @@ enum psmouse_type {
PSMOUSE_CYPRESS,
PSMOUSE_FOCALTECH,
PSMOUSE_VMMOUSE,
PSMOUSE_BYD,
PSMOUSE_AUTO /* This one should always be last */
};