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gerrit-public.fairphone.software / kernel / msm-4.9 / 1a60864fc1c3b268a921549bcfc707c98083260b / . / drivers / input / mouse / elantech.c
blob: 597e9b8fc18db99c5bf1f33b3a274c632b2ba24b [file] [log] [blame]
/*
* Elantech Touchpad driver (v6)
*
* Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
*
* 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.
*
* Trademarks are the property of their respective owners.
*/
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/serio.h>
#include <linux/libps2.h>
#include "psmouse.h"
#include "elantech.h"
#define elantech_debug(fmt, ...) \
do { \
if (etd->debug) \
psmouse_printk(KERN_DEBUG, psmouse, \
fmt, ##__VA_ARGS__); \
} while (0)
/*
* Send a Synaptics style sliced query command
*/
static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
unsigned char *param)
{
if (psmouse_sliced_command(psmouse, c) ||
ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
return -1;
}
return 0;
}
/*
* V3 and later support this fast command
*/
static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c,
unsigned char *param)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) ||
ps2_command(ps2dev, NULL, c) ||
ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c);
return -1;
}
return 0;
}
/*
* A retrying version of ps2_command
*/
static int elantech_ps2_command(struct psmouse *psmouse,
unsigned char *param, int command)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
struct elantech_data *etd = psmouse->private;
int rc;
int tries = ETP_PS2_COMMAND_TRIES;
do {
rc = ps2_command(ps2dev, param, command);
if (rc == 0)
break;
tries--;
elantech_debug("retrying ps2 command 0x%02x (%d).\n",
command, tries);
msleep(ETP_PS2_COMMAND_DELAY);
} while (tries > 0);
if (rc)
psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command);
return rc;
}
/*
* Send an Elantech style special command to read a value from a register
*/
static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
unsigned char *val)
{
struct elantech_data *etd = psmouse->private;
unsigned char param[3];
int rc = 0;
if (reg < 0x07 || reg > 0x26)
return -1;
if (reg > 0x11 && reg < 0x20)
return -1;
switch (etd->hw_version) {
case 1:
if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
psmouse_sliced_command(psmouse, reg) ||
ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
rc = -1;
}
break;
case 2:
if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, reg) ||
elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
rc = -1;
}
break;
case 3 ... 4:
if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, reg) ||
elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
rc = -1;
}
break;
}
if (rc)
psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg);
else if (etd->hw_version != 4)
*val = param[0];
else
*val = param[1];
return rc;
}
/*
* Send an Elantech style special command to write a register with a value
*/
static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
unsigned char val)
{
struct elantech_data *etd = psmouse->private;
int rc = 0;
if (reg < 0x07 || reg > 0x26)
return -1;
if (reg > 0x11 && reg < 0x20)
return -1;
switch (etd->hw_version) {
case 1:
if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
psmouse_sliced_command(psmouse, reg) ||
psmouse_sliced_command(psmouse, val) ||
ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
rc = -1;
}
break;
case 2:
if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, reg) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, val) ||
elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
rc = -1;
}
break;
case 3:
if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, reg) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, val) ||
elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
rc = -1;
}
break;
case 4:
if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, reg) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
elantech_ps2_command(psmouse, NULL, val) ||
elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
rc = -1;
}
break;
}
if (rc)
psmouse_err(psmouse,
"failed to write register 0x%02x with value 0x%02x.\n",
reg, val);
return rc;
}
/*
* Dump a complete mouse movement packet to the syslog
*/
static void elantech_packet_dump(struct psmouse *psmouse)
{
int i;
psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [");
for (i = 0; i < psmouse->pktsize; i++)
printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]);
printk("]\n");
}
/*
* Interpret complete data packets and report absolute mode input events for
* hardware version 1. (4 byte packets)
*/
static void elantech_report_absolute_v1(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
struct elantech_data *etd = psmouse->private;
unsigned char *packet = psmouse->packet;
int fingers;
if (etd->fw_version < 0x020000) {
/*
* byte 0: D U p1 p2 1 p3 R L
* byte 1: f 0 th tw x9 x8 y9 y8
*/
fingers = ((packet[1] & 0x80) >> 7) +
((packet[1] & 0x30) >> 4);
} else {
/*
* byte 0: n1 n0 p2 p1 1 p3 R L
* byte 1: 0 0 0 0 x9 x8 y9 y8
*/
fingers = (packet[0] & 0xc0) >> 6;
}
if (etd->jumpy_cursor) {
if (fingers != 1) {
etd->single_finger_reports = 0;
} else if (etd->single_finger_reports < 2) {
/* Discard first 2 reports of one finger, bogus */
etd->single_finger_reports++;
elantech_debug("discarding packet\n");
return;
}
}
input_report_key(dev, BTN_TOUCH, fingers != 0);
/*
* byte 2: x7 x6 x5 x4 x3 x2 x1 x0
* byte 3: y7 y6 y5 y4 y3 y2 y1 y0
*/
if (fingers) {
input_report_abs(dev, ABS_X,
((packet[1] & 0x0c) << 6) | packet[2]);
input_report_abs(dev, ABS_Y,
etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
}
input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
if (etd->fw_version < 0x020000 &&
(etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
/* rocker up */
input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
/* rocker down */
input_report_key(dev, BTN_BACK, packet[0] & 0x80);
}
input_sync(dev);
}
static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
unsigned int x, unsigned int y)
{
input_mt_slot(dev, slot);
input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
if (active) {
input_report_abs(dev, ABS_MT_POSITION_X, x);
input_report_abs(dev, ABS_MT_POSITION_Y, y);
}
}
/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
static void elantech_report_semi_mt_data(struct input_dev *dev,
unsigned int num_fingers,
unsigned int x1, unsigned int y1,
unsigned int x2, unsigned int y2)
{
elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
}
/*
* Interpret complete data packets and report absolute mode input events for
* hardware version 2. (6 byte packets)
*/
static void elantech_report_absolute_v2(struct psmouse *psmouse)
{
struct elantech_data *etd = psmouse->private;
struct input_dev *dev = psmouse->dev;
unsigned char *packet = psmouse->packet;
unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
unsigned int width = 0, pres = 0;
/* byte 0: n1 n0 . . . . R L */
fingers = (packet[0] & 0xc0) >> 6;
switch (fingers) {
case 3:
/*
* Same as one finger, except report of more than 3 fingers:
* byte 3: n4 . w1 w0 . . . .
*/
if (packet[3] & 0x80)
fingers = 4;
/* pass through... */
case 1:
/*
* byte 1: . . . . x11 x10 x9 x8
* byte 2: x7 x6 x5 x4 x4 x2 x1 x0
*/
x1 = ((packet[1] & 0x0f) << 8) | packet[2];
/*
* byte 4: . . . . y11 y10 y9 y8
* byte 5: y7 y6 y5 y4 y3 y2 y1 y0
*/
y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
break;
case 2:
/*
* The coordinate of each finger is reported separately
* with a lower resolution for two finger touches:
* byte 0: . . ay8 ax8 . . . .
* byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
*/
x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
/* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
y1 = etd->y_max -
((((packet[0] & 0x20) << 3) | packet[2]) << 2);
/*
* byte 3: . . by8 bx8 . . . .
* byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
*/
x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
/* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
y2 = etd->y_max -
((((packet[3] & 0x20) << 3) | packet[5]) << 2);
/* Unknown so just report sensible values */
pres = 127;
width = 7;
break;
}
input_report_key(dev, BTN_TOUCH, fingers != 0);
if (fingers != 0) {
input_report_abs(dev, ABS_X, x1);
input_report_abs(dev, ABS_Y, y1);
}
elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
if (etd->reports_pressure) {
input_report_abs(dev, ABS_PRESSURE, pres);
input_report_abs(dev, ABS_TOOL_WIDTH, width);
}
input_sync(dev);
}
/*
* Interpret complete data packets and report absolute mode input events for
* hardware version 3. (12 byte packets for two fingers)
*/
static void elantech_report_absolute_v3(struct psmouse *psmouse,
int packet_type)
{
struct input_dev *dev = psmouse->dev;
struct elantech_data *etd = psmouse->private;
unsigned char *packet = psmouse->packet;
unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
unsigned int width = 0, pres = 0;
/* byte 0: n1 n0 . . . . R L */
fingers = (packet[0] & 0xc0) >> 6;
switch (fingers) {
case 3:
case 1:
/*
* byte 1: . . . . x11 x10 x9 x8
* byte 2: x7 x6 x5 x4 x4 x2 x1 x0
*/
x1 = ((packet[1] & 0x0f) << 8) | packet[2];
/*
* byte 4: . . . . y11 y10 y9 y8
* byte 5: y7 y6 y5 y4 y3 y2 y1 y0
*/
y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
break;
case 2:
if (packet_type == PACKET_V3_HEAD) {
/*
* byte 1: . . . . ax11 ax10 ax9 ax8
* byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
*/
etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
/*
* byte 4: . . . . ay11 ay10 ay9 ay8
* byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
*/
etd->mt[0].y = etd->y_max -
(((packet[4] & 0x0f) << 8) | packet[5]);
/*
* wait for next packet
*/
return;
}
/* packet_type == PACKET_V3_TAIL */
x1 = etd->mt[0].x;
y1 = etd->mt[0].y;
x2 = ((packet[1] & 0x0f) << 8) | packet[2];
y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
break;
}
pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
input_report_key(dev, BTN_TOUCH, fingers != 0);
if (fingers != 0) {
input_report_abs(dev, ABS_X, x1);
input_report_abs(dev, ABS_Y, y1);
}
elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
input_report_abs(dev, ABS_PRESSURE, pres);
input_report_abs(dev, ABS_TOOL_WIDTH, width);
input_sync(dev);
}
static void elantech_input_sync_v4(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
unsigned char *packet = psmouse->packet;
input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
input_mt_report_pointer_emulation(dev, true);
input_sync(dev);
}
static void process_packet_status_v4(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
unsigned char *packet = psmouse->packet;
unsigned fingers;
int i;
/* notify finger state change */
fingers = packet[1] & 0x1f;
for (i = 0; i < ETP_MAX_FINGERS; i++) {
if ((fingers & (1 << i)) == 0) {
input_mt_slot(dev, i);
input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
}
}
elantech_input_sync_v4(psmouse);
}
static void process_packet_head_v4(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
struct elantech_data *etd = psmouse->private;
unsigned char *packet = psmouse->packet;
int id = ((packet[3] & 0xe0) >> 5) - 1;
int pres, traces;
if (id < 0)
return;
etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
traces = (packet[0] & 0xf0) >> 4;
input_mt_slot(dev, id);
input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
input_report_abs(dev, ABS_MT_PRESSURE, pres);
input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
/* report this for backwards compatibility */
input_report_abs(dev, ABS_TOOL_WIDTH, traces);
elantech_input_sync_v4(psmouse);
}
static void process_packet_motion_v4(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
struct elantech_data *etd = psmouse->private;
unsigned char *packet = psmouse->packet;
int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
int id, sid;
id = ((packet[0] & 0xe0) >> 5) - 1;
if (id < 0)
return;
sid = ((packet[3] & 0xe0) >> 5) - 1;
weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
/*
* Motion packets give us the delta of x, y values of specific fingers,
* but in two's complement. Let the compiler do the conversion for us.
* Also _enlarge_ the numbers to int, in case of overflow.
*/
delta_x1 = (signed char)packet[1];
delta_y1 = (signed char)packet[2];
delta_x2 = (signed char)packet[4];
delta_y2 = (signed char)packet[5];
etd->mt[id].x += delta_x1 * weight;
etd->mt[id].y -= delta_y1 * weight;
input_mt_slot(dev, id);
input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
if (sid >= 0) {
etd->mt[sid].x += delta_x2 * weight;
etd->mt[sid].y -= delta_y2 * weight;
input_mt_slot(dev, sid);
input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
}
elantech_input_sync_v4(psmouse);
}
static void elantech_report_absolute_v4(struct psmouse *psmouse,
int packet_type)
{
switch (packet_type) {
case PACKET_V4_STATUS:
process_packet_status_v4(psmouse);
break;
case PACKET_V4_HEAD:
process_packet_head_v4(psmouse);
break;
case PACKET_V4_MOTION:
process_packet_motion_v4(psmouse);
break;
case PACKET_UNKNOWN:
default:
/* impossible to get here */
break;
}
}
static int elantech_packet_check_v1(struct psmouse *psmouse)
{
struct elantech_data *etd = psmouse->private;
unsigned char *packet = psmouse->packet;
unsigned char p1, p2, p3;
/* Parity bits are placed differently */
if (etd->fw_version < 0x020000) {
/* byte 0: D U p1 p2 1 p3 R L */
p1 = (packet[0] & 0x20) >> 5;
p2 = (packet[0] & 0x10) >> 4;
} else {
/* byte 0: n1 n0 p2 p1 1 p3 R L */
p1 = (packet[0] & 0x10) >> 4;
p2 = (packet[0] & 0x20) >> 5;
}
p3 = (packet[0] & 0x04) >> 2;
return etd->parity[packet[1]] == p1 &&
etd->parity[packet[2]] == p2 &&
etd->parity[packet[3]] == p3;
}
static int elantech_debounce_check_v2(struct psmouse *psmouse)
{
/*
* When we encounter packet that matches this exactly, it means the
* hardware is in debounce status. Just ignore the whole packet.
*/
const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
unsigned char *packet = psmouse->packet;
return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
}
static int elantech_packet_check_v2(struct psmouse *psmouse)
{
struct elantech_data *etd = psmouse->private;
unsigned char *packet = psmouse->packet;
/*
* V2 hardware has two flavors. Older ones that do not report pressure,
* and newer ones that reports pressure and width. With newer ones, all
* packets (1, 2, 3 finger touch) have the same constant bits. With
* older ones, 1/3 finger touch packets and 2 finger touch packets
* have different constant bits.
* With all three cases, if the constant bits are not exactly what I
* expected, I consider them invalid.
*/
if (etd->reports_pressure)
return (packet[0] & 0x0c) == 0x04 &&
(packet[3] & 0x0f) == 0x02;
if ((packet[0] & 0xc0) == 0x80)
return (packet[0] & 0x0c) == 0x0c &&
(packet[3] & 0x0e) == 0x08;
return (packet[0] & 0x3c) == 0x3c &&
(packet[1] & 0xf0) == 0x00 &&
(packet[3] & 0x3e) == 0x38 &&
(packet[4] & 0xf0) == 0x00;
}
/*
* We check the constant bits to determine what packet type we get,
* so packet checking is mandatory for v3 and later hardware.
*/
static int elantech_packet_check_v3(struct psmouse *psmouse)
{
struct elantech_data *etd = psmouse->private;
const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
unsigned char *packet = psmouse->packet;
/*
* check debounce first, it has the same signature in byte 0
* and byte 3 as PACKET_V3_HEAD.
*/
if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
return PACKET_DEBOUNCE;
/*
* If the hardware flag 'crc_enabled' is set the packets have
* different signatures.
*/
if (etd->crc_enabled) {
if ((packet[3] & 0x09) == 0x08)
return PACKET_V3_HEAD;
if ((packet[3] & 0x09) == 0x09)
return PACKET_V3_TAIL;
} else {
if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
return PACKET_V3_HEAD;
if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
return PACKET_V3_TAIL;
}
return PACKET_UNKNOWN;
}
static int elantech_packet_check_v4(struct psmouse *psmouse)
{
struct elantech_data *etd = psmouse->private;
unsigned char *packet = psmouse->packet;
unsigned char packet_type = packet[3] & 0x03;
bool sanity_check;
/*
* Sanity check based on the constant bits of a packet.
* The constant bits change depending on the value of
* the hardware flag 'crc_enabled' but are the same for
* every packet, regardless of the type.
*/
if (etd->crc_enabled)
sanity_check = ((packet[3] & 0x08) == 0x00);
else
sanity_check = ((packet[0] & 0x0c) == 0x04 &&
(packet[3] & 0x1c) == 0x10);
if (!sanity_check)
return PACKET_UNKNOWN;
switch (packet_type) {
case 0:
return PACKET_V4_STATUS;
case 1:
return PACKET_V4_HEAD;
case 2:
return PACKET_V4_MOTION;
}
return PACKET_UNKNOWN;
}
/*
* Process byte stream from mouse and handle complete packets
*/
static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
{
struct elantech_data *etd = psmouse->private;
int packet_type;
if (psmouse->pktcnt < psmouse->pktsize)
return PSMOUSE_GOOD_DATA;
if (etd->debug > 1)
elantech_packet_dump(psmouse);
switch (etd->hw_version) {
case 1:
if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
return PSMOUSE_BAD_DATA;
elantech_report_absolute_v1(psmouse);
break;
case 2:
/* ignore debounce */
if (elantech_debounce_check_v2(psmouse))
return PSMOUSE_FULL_PACKET;
if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
return PSMOUSE_BAD_DATA;
elantech_report_absolute_v2(psmouse);
break;
case 3:
packet_type = elantech_packet_check_v3(psmouse);
/* ignore debounce */
if (packet_type == PACKET_DEBOUNCE)
return PSMOUSE_FULL_PACKET;
if (packet_type == PACKET_UNKNOWN)
return PSMOUSE_BAD_DATA;
elantech_report_absolute_v3(psmouse, packet_type);
break;
case 4:
packet_type = elantech_packet_check_v4(psmouse);
if (packet_type == PACKET_UNKNOWN)
return PSMOUSE_BAD_DATA;
elantech_report_absolute_v4(psmouse, packet_type);
break;
}
return PSMOUSE_FULL_PACKET;
}
/*
* Put the touchpad into absolute mode
*/
static int elantech_set_absolute_mode(struct psmouse *psmouse)
{
struct elantech_data *etd = psmouse->private;
unsigned char val;
int tries = ETP_READ_BACK_TRIES;
int rc = 0;
switch (etd->hw_version) {
case 1:
etd->reg_10 = 0x16;
etd->reg_11 = 0x8f;
if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
rc = -1;
}
break;
case 2:
/* Windows driver values */
etd->reg_10 = 0x54;
etd->reg_11 = 0x88; /* 0x8a */
etd->reg_21 = 0x60; /* 0x00 */
if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
rc = -1;
}
break;
case 3:
etd->reg_10 = 0x0b;
if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
rc = -1;
break;
case 4:
etd->reg_07 = 0x01;
if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
rc = -1;
goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
}
if (rc == 0) {
/*
* Read back reg 0x10. For hardware version 1 we must make
* sure the absolute mode bit is set. For hardware version 2
* the touchpad is probably initializing and not ready until
* we read back the value we just wrote.
*/
do {
rc = elantech_read_reg(psmouse, 0x10, &val);
if (rc == 0)
break;
tries--;
elantech_debug("retrying read (%d).\n", tries);
msleep(ETP_READ_BACK_DELAY);
} while (tries > 0);
if (rc) {
psmouse_err(psmouse,
"failed to read back register 0x10.\n");
} else if (etd->hw_version == 1 &&
!(val & ETP_R10_ABSOLUTE_MODE)) {
psmouse_err(psmouse,
"touchpad refuses to switch to absolute mode.\n");
rc = -1;
}
}
skip_readback_reg_10:
if (rc)
psmouse_err(psmouse, "failed to initialise registers.\n");
return rc;
}
static int elantech_set_range(struct psmouse *psmouse,
unsigned int *x_min, unsigned int *y_min,
unsigned int *x_max, unsigned int *y_max,
unsigned int *width)
{
struct elantech_data *etd = psmouse->private;
unsigned char param[3];
unsigned char traces;
switch (etd->hw_version) {
case 1:
*x_min = ETP_XMIN_V1;
*y_min = ETP_YMIN_V1;
*x_max = ETP_XMAX_V1;
*y_max = ETP_YMAX_V1;
break;
case 2:
if (etd->fw_version == 0x020800 ||
etd->fw_version == 0x020b00 ||
etd->fw_version == 0x020030) {
*x_min = ETP_XMIN_V2;
*y_min = ETP_YMIN_V2;
*x_max = ETP_XMAX_V2;
*y_max = ETP_YMAX_V2;
} else {
int i;
int fixed_dpi;
i = (etd->fw_version > 0x020800 &&
etd->fw_version < 0x020900) ? 1 : 2;
if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
return -1;
fixed_dpi = param[1] & 0x10;
if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
return -1;
*x_max = (etd->capabilities[1] - i) * param[1] / 2;
*y_max = (etd->capabilities[2] - i) * param[2] / 2;
} else if (etd->fw_version == 0x040216) {
*x_max = 819;
*y_max = 405;
} else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
*x_max = 900;
*y_max = 500;
} else {
*x_max = (etd->capabilities[1] - i) * 64;
*y_max = (etd->capabilities[2] - i) * 64;
}
}
break;
case 3:
if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
return -1;
*x_max = (0x0f & param[0]) << 8 | param[1];
*y_max = (0xf0 & param[0]) << 4 | param[2];
break;
case 4:
if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
return -1;
*x_max = (0x0f & param[0]) << 8 | param[1];
*y_max = (0xf0 & param[0]) << 4 | param[2];
traces = etd->capabilities[1];
if ((traces < 2) || (traces > *x_max))
return -1;
*width = *x_max / (traces - 1);
break;
}
return 0;
}
/*
* (value from firmware) * 10 + 790 = dpi
* we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
*/
static unsigned int elantech_convert_res(unsigned int val)
{
return (val * 10 + 790) * 10 / 254;
}
static int elantech_get_resolution_v4(struct psmouse *psmouse,
unsigned int *x_res,
unsigned int *y_res)
{
unsigned char param[3];
if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
return -1;
*x_res = elantech_convert_res(param[1] & 0x0f);
*y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
return 0;
}
/*
* Set the appropriate event bits for the input subsystem
*/
static int elantech_set_input_params(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
struct elantech_data *etd = psmouse->private;
unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
unsigned int x_res = 0, y_res = 0;
if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
return -1;
__set_bit(INPUT_PROP_POINTER, dev->propbit);
__set_bit(EV_KEY, dev->evbit);
__set_bit(EV_ABS, dev->evbit);
__clear_bit(EV_REL, dev->evbit);
__set_bit(BTN_LEFT, dev->keybit);
__set_bit(BTN_RIGHT, dev->keybit);
__set_bit(BTN_TOUCH, dev->keybit);
__set_bit(BTN_TOOL_FINGER, dev->keybit);
__set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
__set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
switch (etd->hw_version) {
case 1:
/* Rocker button */
if (etd->fw_version < 0x020000 &&
(etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
__set_bit(BTN_FORWARD, dev->keybit);
__set_bit(BTN_BACK, dev->keybit);
}
input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
break;
case 2:
__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
__set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
/* fall through */
case 3:
input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
if (etd->reports_pressure) {
input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
ETP_PMAX_V2, 0, 0);
input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
ETP_WMAX_V2, 0, 0);
}
input_mt_init_slots(dev, 2, 0);
input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
break;
case 4:
if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) {
/*
* if query failed, print a warning and leave the values
* zero to resemble synaptics.c behavior.
*/
psmouse_warn(psmouse, "couldn't query resolution data.\n");
}
/* v4 is clickpad, with only one button. */
__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
__clear_bit(BTN_RIGHT, dev->keybit);
__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
/* For X to recognize me as touchpad. */
input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
input_abs_set_res(dev, ABS_X, x_res);
input_abs_set_res(dev, ABS_Y, y_res);
/*
* range of pressure and width is the same as v2,
* report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
*/
input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
ETP_PMAX_V2, 0, 0);
input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
ETP_WMAX_V2, 0, 0);
/* Multitouch capable pad, up to 5 fingers. */
input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
ETP_PMAX_V2, 0, 0);
/*
* The firmware reports how many trace lines the finger spans,
* convert to surface unit as Protocol-B requires.
*/
input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
ETP_WMAX_V2 * width, 0, 0);
break;
}
etd->y_max = y_max;
etd->width = width;
return 0;
}
struct elantech_attr_data {
size_t field_offset;
unsigned char reg;
};
/*
* Display a register value by reading a sysfs entry
*/
static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
char *buf)
{
struct elantech_data *etd = psmouse->private;
struct elantech_attr_data *attr = data;
unsigned char *reg = (unsigned char *) etd + attr->field_offset;
int rc = 0;
if (attr->reg)
rc = elantech_read_reg(psmouse, attr->reg, reg);
return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
}
/*
* Write a register value by writing a sysfs entry
*/
static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
void *data, const char *buf, size_t count)
{
struct elantech_data *etd = psmouse->private;
struct elantech_attr_data *attr = data;
unsigned char *reg = (unsigned char *) etd + attr->field_offset;
unsigned char value;
int err;
err = kstrtou8(buf, 16, &value);
if (err)
return err;
/* Do we need to preserve some bits for version 2 hardware too? */
if (etd->hw_version == 1) {
if (attr->reg == 0x10)
/* Force absolute mode always on */
value |= ETP_R10_ABSOLUTE_MODE;
else if (attr->reg == 0x11)
/* Force 4 byte mode always on */
value |= ETP_R11_4_BYTE_MODE;
}
if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
*reg = value;
return count;
}
#define ELANTECH_INT_ATTR(_name, _register) \
static struct elantech_attr_data elantech_attr_##_name = { \
.field_offset = offsetof(struct elantech_data, _name), \
.reg = _register, \
}; \
PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
&elantech_attr_##_name, \
elantech_show_int_attr, \
elantech_set_int_attr)
ELANTECH_INT_ATTR(reg_07, 0x07);
ELANTECH_INT_ATTR(reg_10, 0x10);
ELANTECH_INT_ATTR(reg_11, 0x11);
ELANTECH_INT_ATTR(reg_20, 0x20);
ELANTECH_INT_ATTR(reg_21, 0x21);
ELANTECH_INT_ATTR(reg_22, 0x22);
ELANTECH_INT_ATTR(reg_23, 0x23);
ELANTECH_INT_ATTR(reg_24, 0x24);
ELANTECH_INT_ATTR(reg_25, 0x25);
ELANTECH_INT_ATTR(reg_26, 0x26);
ELANTECH_INT_ATTR(debug, 0);
ELANTECH_INT_ATTR(paritycheck, 0);
static struct attribute *elantech_attrs[] = {
&psmouse_attr_reg_07.dattr.attr,
&psmouse_attr_reg_10.dattr.attr,
&psmouse_attr_reg_11.dattr.attr,
&psmouse_attr_reg_20.dattr.attr,
&psmouse_attr_reg_21.dattr.attr,
&psmouse_attr_reg_22.dattr.attr,
&psmouse_attr_reg_23.dattr.attr,
&psmouse_attr_reg_24.dattr.attr,
&psmouse_attr_reg_25.dattr.attr,
&psmouse_attr_reg_26.dattr.attr,
&psmouse_attr_debug.dattr.attr,
&psmouse_attr_paritycheck.dattr.attr,
NULL
};
static struct attribute_group elantech_attr_group = {
.attrs = elantech_attrs,
};
static bool elantech_is_signature_valid(const unsigned char *param)
{
static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
int i;
if (param[0] == 0)
return false;
if (param[1] == 0)
return true;
for (i = 0; i < ARRAY_SIZE(rates); i++)
if (param[2] == rates[i])
return false;
return true;
}
/*
* Use magic knock to detect Elantech touchpad
*/
int elantech_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[3];
ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
return -1;
}
/*
* Report this in case there are Elantech models that use a different
* set of magic numbers
*/
if (param[0] != 0x3c || param[1] != 0x03 ||
(param[2] != 0xc8 && param[2] != 0x00)) {
psmouse_dbg(psmouse,
"unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
param[0], param[1], param[2]);
return -1;
}
/*
* Query touchpad's firmware version and see if it reports known
* value to avoid mis-detection. Logitech mice are known to respond
* to Elantech magic knock and there might be more.
*/
if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
psmouse_dbg(psmouse, "failed to query firmware version.\n");
return -1;
}
psmouse_dbg(psmouse,
"Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
param[0], param[1], param[2]);
if (!elantech_is_signature_valid(param)) {
psmouse_dbg(psmouse,
"Probably not a real Elantech touchpad. Aborting.\n");
return -1;
}
if (set_properties) {
psmouse->vendor = "Elantech";
psmouse->name = "Touchpad";
}
return 0;
}
/*
* Clean up sysfs entries when disconnecting
*/
static void elantech_disconnect(struct psmouse *psmouse)
{
sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
&elantech_attr_group);
kfree(psmouse->private);
psmouse->private = NULL;
}
/*
* Put the touchpad back into absolute mode when reconnecting
*/
static int elantech_reconnect(struct psmouse *psmouse)
{
psmouse_reset(psmouse);
if (elantech_detect(psmouse, 0))
return -1;
if (elantech_set_absolute_mode(psmouse)) {
psmouse_err(psmouse,
"failed to put touchpad back into absolute mode.\n");
return -1;
}
return 0;
}
/*
* determine hardware version and set some properties according to it.
*/
static int elantech_set_properties(struct elantech_data *etd)
{
/* This represents the version of IC body. */
int ver = (etd->fw_version & 0x0f0000) >> 16;
/* Early version of Elan touchpads doesn't obey the rule. */
if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
etd->hw_version = 1;
else {
switch (ver) {
case 2:
case 4:
etd->hw_version = 2;
break;
case 5:
etd->hw_version = 3;
break;
case 6:
case 7:
case 8:
etd->hw_version = 4;
break;
default:
return -1;
}
}
/* decide which send_cmd we're gonna use early */
etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd :
synaptics_send_cmd;
/* Turn on packet checking by default */
etd->paritycheck = 1;
/*
* This firmware suffers from misreporting coordinates when
* a touch action starts causing the mouse cursor or scrolled page
* to jump. Enable a workaround.
*/
etd->jumpy_cursor =
(etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
if (etd->hw_version > 1) {
/* For now show extra debug information */
etd->debug = 1;
if (etd->fw_version >= 0x020800)
etd->reports_pressure = true;
}
/*
* The signatures of v3 and v4 packets change depending on the
* value of this hardware flag.
*/
etd->crc_enabled = ((etd->fw_version & 0x4000) == 0x4000);
return 0;
}
/*
* Initialize the touchpad and create sysfs entries
*/
int elantech_init(struct psmouse *psmouse)
{
struct elantech_data *etd;
int i, error;
unsigned char param[3];
psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
if (!etd)
return -ENOMEM;
psmouse_reset(psmouse);
etd->parity[0] = 1;
for (i = 1; i < 256; i++)
etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
/*
* Do the version query again so we can store the result
*/
if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
psmouse_err(psmouse, "failed to query firmware version.\n");
goto init_fail;
}
etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
if (elantech_set_properties(etd)) {
psmouse_err(psmouse, "unknown hardware version, aborting...\n");
goto init_fail;
}
psmouse_info(psmouse,
"assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
etd->hw_version, param[0], param[1], param[2]);
if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
etd->capabilities)) {
psmouse_err(psmouse, "failed to query capabilities.\n");
goto init_fail;
}
psmouse_info(psmouse,
"Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
etd->capabilities[0], etd->capabilities[1],
etd->capabilities[2]);
if (elantech_set_absolute_mode(psmouse)) {
psmouse_err(psmouse,
"failed to put touchpad into absolute mode.\n");
goto init_fail;
}
if (elantech_set_input_params(psmouse)) {
psmouse_err(psmouse, "failed to query touchpad range.\n");
goto init_fail;
}
error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
&elantech_attr_group);
if (error) {
psmouse_err(psmouse,
"failed to create sysfs attributes, error: %d.\n",
error);
goto init_fail;
}
psmouse->protocol_handler = elantech_process_byte;
psmouse->disconnect = elantech_disconnect;
psmouse->reconnect = elantech_reconnect;
psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
return 0;
init_fail:
kfree(etd);
return -1;
}