From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/input/mouse/elantech.c | 2193 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 2193 insertions(+) create mode 100644 drivers/input/mouse/elantech.c (limited to 'drivers/input/mouse/elantech.c') diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c new file mode 100644 index 0000000000..4e38229404 --- /dev/null +++ b/drivers/input/mouse/elantech.c @@ -0,0 +1,2193 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Elantech Touchpad driver (v6) + * + * Copyright (C) 2007-2009 Arjan Opmeer + * + * Trademarks are the property of their respective owners. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "psmouse.h" +#include "elantech.h" +#include "elan_i2c.h" + +#define elantech_debug(fmt, ...) \ + do { \ + if (etd->info.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 (ps2_sliced_command(&psmouse->ps2dev, 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 3 bytes from a register + */ +static int elantech_read_reg_params(struct psmouse *psmouse, u8 reg, u8 *param) +{ + 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)) { + psmouse_err(psmouse, + "failed to read register %#02x\n", reg); + return -EIO; + } + + return 0; +} + +/* + * Send an Elantech style special command to write a register with a parameter + */ +static int elantech_write_reg_params(struct psmouse *psmouse, u8 reg, u8 *param) +{ + 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, param[0]) || + elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || + elantech_ps2_command(psmouse, NULL, param[1]) || + elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { + psmouse_err(psmouse, + "failed to write register %#02x with value %#02x%#02x\n", + reg, param[0], param[1]); + return -EIO; + } + + return 0; +} + +/* + * 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->info.hw_version) { + case 1: + if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_READ) || + ps2_sliced_command(&psmouse->ps2dev, 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->info.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->info.hw_version) { + case 1: + if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_WRITE) || + ps2_sliced_command(&psmouse->ps2dev, reg) || + ps2_sliced_command(&psmouse->ps2dev, 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) +{ + psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [%*ph]\n", + psmouse->pktsize, psmouse->packet); +} + +/* + * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in + * fw_version for this is based on the following fw_version & caps table: + * + * Laptop-model: fw_version: caps: buttons: + * Acer S3 0x461f00 10, 13, 0e clickpad + * Acer S7-392 0x581f01 50, 17, 0d clickpad + * Acer V5-131 0x461f02 01, 16, 0c clickpad + * Acer V5-551 0x461f00 ? clickpad + * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons + * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons + * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons + * Asus TP500LN 0x381f17 10, 14, 0e clickpad + * Asus X750JN 0x381f17 10, 14, 0e clickpad + * Asus UX31 0x361f00 20, 15, 0e clickpad + * Asus UX32VD 0x361f02 00, 15, 0e clickpad + * Avatar AVIU-145A2 0x361f00 ? clickpad + * Fujitsu CELSIUS H760 0x570f02 40, 14, 0c 3 hw buttons (**) + * Fujitsu CELSIUS H780 0x5d0f02 41, 16, 0d 3 hw buttons (**) + * Fujitsu LIFEBOOK E544 0x470f00 d0, 12, 09 2 hw buttons + * Fujitsu LIFEBOOK E546 0x470f00 50, 12, 09 2 hw buttons + * Fujitsu LIFEBOOK E547 0x470f00 50, 12, 09 2 hw buttons + * Fujitsu LIFEBOOK E554 0x570f01 40, 14, 0c 2 hw buttons + * Fujitsu LIFEBOOK E557 0x570f01 40, 14, 0c 2 hw buttons + * Fujitsu T725 0x470f01 05, 12, 09 2 hw buttons + * Fujitsu H730 0x570f00 c0, 14, 0c 3 hw buttons (**) + * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons + * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*) + * Lenovo L530 0x350f02 b9, 15, 0c 2 hw buttons (*) + * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons + * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad + * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad + * Samsung NP900X3E-A02 0x575f03 ? clickpad + * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad + * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons + * Samsung RF710 0x450f00 ? 2 hw buttons + * System76 Pangolin 0x250f01 ? 2 hw buttons + * (*) + 3 trackpoint buttons + * (**) + 0 trackpoint buttons + * Note: Lenovo L430 and Lenovo L530 have the same fw_version/caps + */ +static inline int elantech_is_buttonpad(struct elantech_device_info *info) +{ + return info->fw_version & 0x001000; +} + +/* + * 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->info.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->info.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); + + psmouse_report_standard_buttons(dev, packet[0]); + + if (etd->info.fw_version < 0x020000 && + (etd->info.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; + fallthrough; + 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); + psmouse_report_standard_buttons(dev, packet[0]); + if (etd->info.reports_pressure) { + input_report_abs(dev, ABS_PRESSURE, pres); + input_report_abs(dev, ABS_TOOL_WIDTH, width); + } + + input_sync(dev); +} + +static void elantech_report_trackpoint(struct psmouse *psmouse, + int packet_type) +{ + /* + * byte 0: 0 0 sx sy 0 M R L + * byte 1:~sx 0 0 0 0 0 0 0 + * byte 2:~sy 0 0 0 0 0 0 0 + * byte 3: 0 0 ~sy ~sx 0 1 1 0 + * byte 4: x7 x6 x5 x4 x3 x2 x1 x0 + * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 + * + * x and y are written in two's complement spread + * over 9 bits with sx/sy the relative top bit and + * x7..x0 and y7..y0 the lower bits. + * The sign of y is opposite to what the input driver + * expects for a relative movement + */ + + struct elantech_data *etd = psmouse->private; + struct input_dev *tp_dev = etd->tp_dev; + unsigned char *packet = psmouse->packet; + int x, y; + u32 t; + + t = get_unaligned_le32(&packet[0]); + + switch (t & ~7U) { + case 0x06000030U: + case 0x16008020U: + case 0x26800010U: + case 0x36808000U: + + /* + * This firmware misreport coordinates for trackpoint + * occasionally. Discard packets outside of [-127, 127] range + * to prevent cursor jumps. + */ + if (packet[4] == 0x80 || packet[5] == 0x80 || + packet[1] >> 7 == packet[4] >> 7 || + packet[2] >> 7 == packet[5] >> 7) { + elantech_debug("discarding packet [%6ph]\n", packet); + break; + + } + x = packet[4] - (int)((packet[1]^0x80) << 1); + y = (int)((packet[2]^0x80) << 1) - packet[5]; + + psmouse_report_standard_buttons(tp_dev, packet[0]); + + input_report_rel(tp_dev, REL_X, x); + input_report_rel(tp_dev, REL_Y, y); + + input_sync(tp_dev); + + break; + + default: + /* Dump unexpected packet sequences if debug=1 (default) */ + if (etd->info.debug == 1) + elantech_packet_dump(psmouse); + + break; + } +} + +/* + * 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); + + /* For clickpads map both buttons to BTN_LEFT */ + if (elantech_is_buttonpad(&etd->info)) + input_report_key(dev, BTN_LEFT, packet[0] & 0x03); + else + psmouse_report_standard_buttons(dev, packet[0]); + + 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; + struct elantech_data *etd = psmouse->private; + unsigned char *packet = psmouse->packet; + + /* For clickpads map both buttons to BTN_LEFT */ + if (elantech_is_buttonpad(&etd->info)) + input_report_key(dev, BTN_LEFT, packet[0] & 0x03); + else + psmouse_report_standard_buttons(dev, packet[0]); + + 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; + int pres, traces; + + id = ((packet[3] & 0xe0) >> 5) - 1; + if (id < 0 || id >= ETP_MAX_FINGERS) + 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 || id >= ETP_MAX_FINGERS) + 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 && sid < ETP_MAX_FINGERS) { + 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->info.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. + */ + static 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->info.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; + static 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->info.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; + if ((packet[3] & 0x0f) == 0x06) + return PACKET_TRACKPOINT; + } + + 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; + unsigned int ic_version; + bool sanity_check; + + if (etd->tp_dev && (packet[3] & 0x0f) == 0x06) + return PACKET_TRACKPOINT; + + /* This represents the version of IC body. */ + ic_version = (etd->info.fw_version & 0x0f0000) >> 16; + + /* + * Sanity check based on the constant bits of a packet. + * The constant bits change depending on the value of + * the hardware flag 'crc_enabled' and the version of + * the IC body, but are the same for every packet, + * regardless of the type. + */ + if (etd->info.crc_enabled) + sanity_check = ((packet[3] & 0x08) == 0x00); + else if (ic_version == 7 && etd->info.samples[1] == 0x2A) + sanity_check = ((packet[3] & 0x1c) == 0x10); + else + sanity_check = ((packet[0] & 0x08) == 0x00 && + (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->info.debug > 1) + elantech_packet_dump(psmouse); + + switch (etd->info.hw_version) { + case 1: + if (etd->info.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->info.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); + switch (packet_type) { + case PACKET_UNKNOWN: + return PSMOUSE_BAD_DATA; + + case PACKET_DEBOUNCE: + /* ignore debounce */ + break; + + case PACKET_TRACKPOINT: + elantech_report_trackpoint(psmouse, packet_type); + break; + + default: + elantech_report_absolute_v3(psmouse, packet_type); + break; + } + + break; + + case 4: + packet_type = elantech_packet_check_v4(psmouse); + switch (packet_type) { + case PACKET_UNKNOWN: + return PSMOUSE_BAD_DATA; + + case PACKET_TRACKPOINT: + elantech_report_trackpoint(psmouse, packet_type); + break; + + default: + elantech_report_absolute_v4(psmouse, packet_type); + break; + } + + break; + } + + return PSMOUSE_FULL_PACKET; +} + +/* + * This writes the reg_07 value again to the hardware at the end of every + * set_rate call because the register loses its value. reg_07 allows setting + * absolute mode on v4 hardware + */ +static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse, + unsigned int rate) +{ + struct elantech_data *etd = psmouse->private; + + etd->original_set_rate(psmouse, rate); + if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) + psmouse_err(psmouse, "restoring reg_07 failed\n"); +} + +/* + * 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->info.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: + if (etd->info.set_hw_resolution) + etd->reg_10 = 0x0b; + else + etd->reg_10 = 0x01; + + 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->info.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; +} + +/* + * (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 int *bus) +{ + 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); + *bus = param[2]; + + return 0; +} + +static void elantech_set_buttonpad_prop(struct psmouse *psmouse) +{ + struct input_dev *dev = psmouse->dev; + struct elantech_data *etd = psmouse->private; + + if (elantech_is_buttonpad(&etd->info)) { + __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); + __clear_bit(BTN_RIGHT, dev->keybit); + } +} + +/* + * Some hw_version 4 models do have a middle button + */ +static const struct dmi_system_id elantech_dmi_has_middle_button[] = { +#if defined(CONFIG_DMI) && defined(CONFIG_X86) + { + /* Fujitsu H730 has a middle button */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"), + }, + }, + { + /* Fujitsu H760 also has a middle button */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"), + }, + }, + { + /* Fujitsu H780 also has a middle button */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H780"), + }, + }, +#endif + { } +}; + +/* + * 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; + struct elantech_device_info *info = &etd->info; + unsigned int x_min = info->x_min, y_min = info->y_min, + x_max = info->x_max, y_max = info->y_max, + width = info->width; + + __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); + if (info->has_middle_button) + __set_bit(BTN_MIDDLE, 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 (info->hw_version) { + case 1: + /* Rocker button */ + if (info->fw_version < 0x020000 && + (info->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); + fallthrough; + case 3: + if (info->hw_version == 3) + elantech_set_buttonpad_prop(psmouse); + 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 (info->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, INPUT_MT_SEMI_MT); + 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: + elantech_set_buttonpad_prop(psmouse); + __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); + /* + * 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_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; + } + + input_abs_set_res(dev, ABS_X, info->x_res); + input_abs_set_res(dev, ABS_Y, info->y_res); + if (info->hw_version > 1) { + input_abs_set_res(dev, ABS_MT_POSITION_X, info->x_res); + input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res); + } + + 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->info.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, 0644, \ + &elantech_attr_##_name, \ + elantech_show_int_attr, \ + elantech_set_int_attr) + +#define ELANTECH_INFO_ATTR(_name) \ + static struct elantech_attr_data elantech_attr_##_name = { \ + .field_offset = offsetof(struct elantech_data, info) + \ + offsetof(struct elantech_device_info, _name), \ + .reg = 0, \ + }; \ + PSMOUSE_DEFINE_ATTR(_name, 0644, \ + &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_INFO_ATTR(debug); +ELANTECH_INFO_ATTR(paritycheck); +ELANTECH_INFO_ATTR(crc_enabled); + +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, + &psmouse_attr_crc_enabled.dattr.attr, + NULL +}; + +static const 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; + + /* + * Some hw_version >= 4 models have a revision higher then 20. Meaning + * that param[2] may be 10 or 20, skip the rates check for these. + */ + if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f && + param[2] < 40) + 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(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) +{ + struct elantech_data *etd = psmouse->private; + + /* + * We might have left a breadcrumb when trying to + * set up SMbus companion. + */ + psmouse_smbus_cleanup(psmouse); + + if (etd->tp_dev) + input_unregister_device(etd->tp_dev); + 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; +} + +/* + * Some hw_version 4 models do not work with crc_disabled + */ +static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = { +#if defined(CONFIG_DMI) && defined(CONFIG_X86) + { + /* Fujitsu H730 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"), + }, + }, + { + /* Fujitsu H760 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"), + }, + }, + { + /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"), + }, + }, + { + /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"), + }, + }, + { + /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"), + }, + }, + { + /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"), + }, + }, + { + /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"), + }, + }, + { + /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"), + }, + }, + { + /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), + DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"), + }, + }, +#endif + { } +}; + +/* + * Some hw_version 3 models go into error state when we try to set + * bit 3 and/or bit 1 of r10. + */ +static const struct dmi_system_id no_hw_res_dmi_table[] = { +#if defined(CONFIG_DMI) && defined(CONFIG_X86) + { + /* Gigabyte U2442 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), + DMI_MATCH(DMI_PRODUCT_NAME, "U2442"), + }, + }, +#endif + { } +}; + +/* + * Change Report id 0x5E to 0x5F. + */ +static int elantech_change_report_id(struct psmouse *psmouse) +{ + /* + * NOTE: the code is expecting to receive param[] as an array of 3 + * items (see __ps2_command()), even if in this case only 2 are + * actually needed. Make sure the array size is 3 to avoid potential + * stack out-of-bound accesses. + */ + unsigned char param[3] = { 0x10, 0x03 }; + + if (elantech_write_reg_params(psmouse, 0x7, param) || + elantech_read_reg_params(psmouse, 0x7, param) || + param[0] != 0x10 || param[1] != 0x03) { + psmouse_err(psmouse, "Unable to change report ID to 0x5f.\n"); + return -EIO; + } + + return 0; +} +/* + * determine hardware version and set some properties according to it. + */ +static int elantech_set_properties(struct elantech_device_info *info) +{ + /* This represents the version of IC body. */ + info->ic_version = (info->fw_version & 0x0f0000) >> 16; + + /* Early version of Elan touchpads doesn't obey the rule. */ + if (info->fw_version < 0x020030 || info->fw_version == 0x020600) + info->hw_version = 1; + else { + switch (info->ic_version) { + case 2: + case 4: + info->hw_version = 2; + break; + case 5: + info->hw_version = 3; + break; + case 6 ... 15: + info->hw_version = 4; + break; + default: + return -1; + } + } + + /* Get information pattern for hw_version 4 */ + info->pattern = 0x00; + if (info->ic_version == 0x0f && (info->fw_version & 0xff) <= 0x02) + info->pattern = info->fw_version & 0xff; + + /* decide which send_cmd we're gonna use early */ + info->send_cmd = info->hw_version >= 3 ? elantech_send_cmd : + synaptics_send_cmd; + + /* Turn on packet checking by default */ + info->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. + */ + info->jumpy_cursor = + (info->fw_version == 0x020022 || info->fw_version == 0x020600); + + if (info->hw_version > 1) { + /* For now show extra debug information */ + info->debug = 1; + + if (info->fw_version >= 0x020800) + info->reports_pressure = true; + } + + /* + * The signatures of v3 and v4 packets change depending on the + * value of this hardware flag. + */ + info->crc_enabled = (info->fw_version & 0x4000) == 0x4000 || + dmi_check_system(elantech_dmi_force_crc_enabled); + + /* Enable real hardware resolution on hw_version 3 ? */ + info->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table); + + return 0; +} + +static int elantech_query_info(struct psmouse *psmouse, + struct elantech_device_info *info) +{ + unsigned char param[3]; + unsigned char traces; + unsigned char ic_body[3]; + + memset(info, 0, sizeof(*info)); + + /* + * 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"); + return -EINVAL; + } + info->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; + + if (elantech_set_properties(info)) { + psmouse_err(psmouse, "unknown hardware version, aborting...\n"); + return -EINVAL; + } + psmouse_info(psmouse, + "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n", + info->hw_version, param[0], param[1], param[2]); + + if (info->send_cmd(psmouse, ETP_CAPABILITIES_QUERY, + info->capabilities)) { + psmouse_err(psmouse, "failed to query capabilities.\n"); + return -EINVAL; + } + psmouse_info(psmouse, + "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", + info->capabilities[0], info->capabilities[1], + info->capabilities[2]); + + if (info->hw_version != 1) { + if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, info->samples)) { + psmouse_err(psmouse, "failed to query sample data\n"); + return -EINVAL; + } + psmouse_info(psmouse, + "Elan sample query result %02x, %02x, %02x\n", + info->samples[0], + info->samples[1], + info->samples[2]); + } + + if (info->pattern > 0x00 && info->ic_version == 0xf) { + if (info->send_cmd(psmouse, ETP_ICBODY_QUERY, ic_body)) { + psmouse_err(psmouse, "failed to query ic body\n"); + return -EINVAL; + } + info->ic_version = be16_to_cpup((__be16 *)ic_body); + psmouse_info(psmouse, + "Elan ic body: %#04x, current fw version: %#02x\n", + info->ic_version, ic_body[2]); + } + + info->product_id = be16_to_cpup((__be16 *)info->samples); + if (info->pattern == 0x00) + info->product_id &= 0xff; + + if (info->samples[1] == 0x74 && info->hw_version == 0x03) { + /* + * This module has a bug which makes absolute mode + * unusable, so let's abort so we'll be using standard + * PS/2 protocol. + */ + psmouse_info(psmouse, + "absolute mode broken, forcing standard PS/2 protocol\n"); + return -ENODEV; + } + + /* The MSB indicates the presence of the trackpoint */ + info->has_trackpoint = (info->capabilities[0] & 0x80) == 0x80; + + if (info->has_trackpoint && info->ic_version == 0x0011 && + (info->product_id == 0x08 || info->product_id == 0x09 || + info->product_id == 0x0d || info->product_id == 0x0e)) { + /* + * This module has a bug which makes trackpoint in SMBus + * mode return invalid data unless trackpoint is switched + * from using 0x5e reports to 0x5f. If we are not able to + * make the switch, let's abort initialization so we'll be + * using standard PS/2 protocol. + */ + if (elantech_change_report_id(psmouse)) { + psmouse_info(psmouse, + "Trackpoint report is broken, forcing standard PS/2 protocol\n"); + return -ENODEV; + } + } + + info->x_res = 31; + info->y_res = 31; + if (info->hw_version == 4) { + if (elantech_get_resolution_v4(psmouse, + &info->x_res, + &info->y_res, + &info->bus)) { + psmouse_warn(psmouse, + "failed to query resolution data.\n"); + } + } + + /* query range information */ + switch (info->hw_version) { + case 1: + info->x_min = ETP_XMIN_V1; + info->y_min = ETP_YMIN_V1; + info->x_max = ETP_XMAX_V1; + info->y_max = ETP_YMAX_V1; + break; + + case 2: + if (info->fw_version == 0x020800 || + info->fw_version == 0x020b00 || + info->fw_version == 0x020030) { + info->x_min = ETP_XMIN_V2; + info->y_min = ETP_YMIN_V2; + info->x_max = ETP_XMAX_V2; + info->y_max = ETP_YMAX_V2; + } else { + int i; + int fixed_dpi; + + i = (info->fw_version > 0x020800 && + info->fw_version < 0x020900) ? 1 : 2; + + if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) + return -EINVAL; + + fixed_dpi = param[1] & 0x10; + + if (((info->fw_version >> 16) == 0x14) && fixed_dpi) { + if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, param)) + return -EINVAL; + + info->x_max = (info->capabilities[1] - i) * param[1] / 2; + info->y_max = (info->capabilities[2] - i) * param[2] / 2; + } else if (info->fw_version == 0x040216) { + info->x_max = 819; + info->y_max = 405; + } else if (info->fw_version == 0x040219 || info->fw_version == 0x040215) { + info->x_max = 900; + info->y_max = 500; + } else { + info->x_max = (info->capabilities[1] - i) * 64; + info->y_max = (info->capabilities[2] - i) * 64; + } + } + break; + + case 3: + if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) + return -EINVAL; + + info->x_max = (0x0f & param[0]) << 8 | param[1]; + info->y_max = (0xf0 & param[0]) << 4 | param[2]; + break; + + case 4: + if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) + return -EINVAL; + + info->x_max = (0x0f & param[0]) << 8 | param[1]; + info->y_max = (0xf0 & param[0]) << 4 | param[2]; + traces = info->capabilities[1]; + if ((traces < 2) || (traces > info->x_max)) + return -EINVAL; + + info->width = info->x_max / (traces - 1); + + /* column number of traces */ + info->x_traces = traces; + + /* row number of traces */ + traces = info->capabilities[2]; + if ((traces >= 2) && (traces <= info->y_max)) + info->y_traces = traces; + + break; + } + + /* check for the middle button: DMI matching or new v4 firmwares */ + info->has_middle_button = dmi_check_system(elantech_dmi_has_middle_button) || + (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) && + !elantech_is_buttonpad(info)); + + return 0; +} + +#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS) + +/* + * The newest Elantech device can use a secondary bus (over SMBus) which + * provides a better bandwidth and allow a better control of the touchpads. + * This is used to decide if we need to use this bus or not. + */ +enum { + ELANTECH_SMBUS_NOT_SET = -1, + ELANTECH_SMBUS_OFF, + ELANTECH_SMBUS_ON, +}; + +static int elantech_smbus = IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ? + ELANTECH_SMBUS_NOT_SET : ELANTECH_SMBUS_OFF; +module_param_named(elantech_smbus, elantech_smbus, int, 0644); +MODULE_PARM_DESC(elantech_smbus, "Use a secondary bus for the Elantech device."); + +static const char * const i2c_blacklist_pnp_ids[] = { + /* + * These are known to not be working properly as bits are missing + * in elan_i2c. + */ + NULL +}; + +static int elantech_create_smbus(struct psmouse *psmouse, + struct elantech_device_info *info, + bool leave_breadcrumbs) +{ + struct property_entry i2c_props[11] = {}; + struct i2c_board_info smbus_board = { + I2C_BOARD_INFO("elan_i2c", 0x15), + .flags = I2C_CLIENT_HOST_NOTIFY, + }; + unsigned int idx = 0; + + i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-x", + info->x_max + 1); + i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-y", + info->y_max + 1); + i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-x", + info->x_min); + i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-y", + info->y_min); + if (info->x_res) + i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-x-mm", + (info->x_max + 1) / info->x_res); + if (info->y_res) + i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-y-mm", + (info->y_max + 1) / info->y_res); + + if (info->has_trackpoint) + i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,trackpoint"); + + if (info->has_middle_button) + i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,middle-button"); + + if (info->x_traces) + i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,x_traces", + info->x_traces); + if (info->y_traces) + i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,y_traces", + info->y_traces); + + if (elantech_is_buttonpad(info)) + i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,clickpad"); + + smbus_board.fwnode = fwnode_create_software_node(i2c_props, NULL); + if (IS_ERR(smbus_board.fwnode)) + return PTR_ERR(smbus_board.fwnode); + + return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false, + leave_breadcrumbs); +} + +/* + * elantech_setup_smbus - called once the PS/2 devices are enumerated + * and decides to instantiate a SMBus InterTouch device. + */ +static int elantech_setup_smbus(struct psmouse *psmouse, + struct elantech_device_info *info, + bool leave_breadcrumbs) +{ + int error; + + if (elantech_smbus == ELANTECH_SMBUS_OFF) + return -ENXIO; + + if (elantech_smbus == ELANTECH_SMBUS_NOT_SET) { + /* + * New ICs are enabled by default, unless mentioned in + * i2c_blacklist_pnp_ids. + * Old ICs are up to the user to decide. + */ + if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) || + psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids)) + return -ENXIO; + } + + psmouse_info(psmouse, "Trying to set up SMBus access\n"); + + error = elantech_create_smbus(psmouse, info, leave_breadcrumbs); + if (error) { + if (error == -EAGAIN) + psmouse_info(psmouse, "SMbus companion is not ready yet\n"); + else + psmouse_err(psmouse, "unable to create intertouch device\n"); + + return error; + } + + return 0; +} + +static bool elantech_use_host_notify(struct psmouse *psmouse, + struct elantech_device_info *info) +{ + if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version)) + return true; + + switch (info->bus) { + case ETP_BUS_PS2_ONLY: + /* expected case */ + break; + case ETP_BUS_SMB_ALERT_ONLY: + case ETP_BUS_PS2_SMB_ALERT: + psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n"); + break; + case ETP_BUS_SMB_HST_NTFY_ONLY: + case ETP_BUS_PS2_SMB_HST_NTFY: + return true; + default: + psmouse_dbg(psmouse, + "Ignoring SMBus bus provider %d.\n", + info->bus); + } + + return false; +} + +int elantech_init_smbus(struct psmouse *psmouse) +{ + struct elantech_device_info info; + int error; + + psmouse_reset(psmouse); + + error = elantech_query_info(psmouse, &info); + if (error) + goto init_fail; + + if (info.hw_version < 4) { + error = -ENXIO; + goto init_fail; + } + + return elantech_create_smbus(psmouse, &info, false); + init_fail: + psmouse_reset(psmouse); + return error; +} +#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */ + +/* + * Initialize the touchpad and create sysfs entries + */ +static int elantech_setup_ps2(struct psmouse *psmouse, + struct elantech_device_info *info) +{ + struct elantech_data *etd; + int i; + int error = -EINVAL; + struct input_dev *tp_dev; + + psmouse->private = etd = kzalloc(sizeof(*etd), GFP_KERNEL); + if (!etd) + return -ENOMEM; + + etd->info = *info; + + etd->parity[0] = 1; + for (i = 1; i < 256; i++) + etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; + + if (elantech_set_absolute_mode(psmouse)) { + psmouse_err(psmouse, + "failed to put touchpad into absolute mode.\n"); + goto init_fail; + } + + if (info->fw_version == 0x381f17) { + etd->original_set_rate = psmouse->set_rate; + psmouse->set_rate = elantech_set_rate_restore_reg_07; + } + + 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; + } + + if (info->has_trackpoint) { + tp_dev = input_allocate_device(); + + if (!tp_dev) { + error = -ENOMEM; + goto init_fail_tp_alloc; + } + + etd->tp_dev = tp_dev; + snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1", + psmouse->ps2dev.serio->phys); + tp_dev->phys = etd->tp_phys; + tp_dev->name = "ETPS/2 Elantech TrackPoint"; + tp_dev->id.bustype = BUS_I8042; + tp_dev->id.vendor = 0x0002; + tp_dev->id.product = PSMOUSE_ELANTECH; + tp_dev->id.version = 0x0000; + tp_dev->dev.parent = &psmouse->ps2dev.serio->dev; + tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); + tp_dev->relbit[BIT_WORD(REL_X)] = + BIT_MASK(REL_X) | BIT_MASK(REL_Y); + tp_dev->keybit[BIT_WORD(BTN_LEFT)] = + BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | + BIT_MASK(BTN_RIGHT); + + __set_bit(INPUT_PROP_POINTER, tp_dev->propbit); + __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit); + + error = input_register_device(etd->tp_dev); + if (error < 0) + goto init_fail_tp_reg; + } + + psmouse->protocol_handler = elantech_process_byte; + psmouse->disconnect = elantech_disconnect; + psmouse->reconnect = elantech_reconnect; + psmouse->fast_reconnect = NULL; + psmouse->pktsize = info->hw_version > 1 ? 6 : 4; + + return 0; + init_fail_tp_reg: + input_free_device(tp_dev); + init_fail_tp_alloc: + sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, + &elantech_attr_group); + init_fail: + kfree(etd); + return error; +} + +int elantech_init_ps2(struct psmouse *psmouse) +{ + struct elantech_device_info info; + int error; + + psmouse_reset(psmouse); + + error = elantech_query_info(psmouse, &info); + if (error) + goto init_fail; + + error = elantech_setup_ps2(psmouse, &info); + if (error) + goto init_fail; + + return 0; + init_fail: + psmouse_reset(psmouse); + return error; +} + +int elantech_init(struct psmouse *psmouse) +{ + struct elantech_device_info info; + int error; + + psmouse_reset(psmouse); + + error = elantech_query_info(psmouse, &info); + if (error) + goto init_fail; + +#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS) + + if (elantech_use_host_notify(psmouse, &info)) { + if (!IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) || + !IS_ENABLED(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)) { + psmouse_warn(psmouse, + "The touchpad can support a better bus than the too old PS/2 protocol. " + "Make sure MOUSE_PS2_ELANTECH_SMBUS and MOUSE_ELAN_I2C_SMBUS are enabled to get a better touchpad experience.\n"); + } + error = elantech_setup_smbus(psmouse, &info, true); + if (!error) + return PSMOUSE_ELANTECH_SMBUS; + } + +#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */ + + error = elantech_setup_ps2(psmouse, &info); + if (error < 0) { + /* + * Not using any flavor of Elantech support, so clean up + * SMbus breadcrumbs, if any. + */ + psmouse_smbus_cleanup(psmouse); + goto init_fail; + } + + return PSMOUSE_ELANTECH; + init_fail: + psmouse_reset(psmouse); + return error; +} -- cgit v1.2.3