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-rw-r--r--drivers/input/mouse/elantech.c2193
1 files changed, 2193 insertions, 0 deletions
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
new file mode 100644
index 000000000..4e3822940
--- /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 <arjan@opmeer.net>
+ *
+ * Trademarks are the property of their respective owners.
+ */
+
+#include <linux/delay.h>
+#include <linux/dmi.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/platform_device.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+#include <asm/unaligned.h>
+#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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-18 20:56:10 +0000