Merge branch 'linus' into x86/uv

1 files changed, 674 insertions, 0 deletions

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
new file mode 100644
index 000000000000..b9a25d57bc5e
--- /dev/null
+++ b/drivers/input/mouse/elantech.c
@@ -0,0 +1,674 @@
+/*
+ * Elantech Touchpad driver (v5)
+ *
+ * Copyright (C) 2007-2008 Arjan Opmeer <arjan@opmeer.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Trademarks are the property of their respective owners.
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+#include "psmouse.h"
+#include "elantech.h"
+
+#define elantech_debug(format, arg...)                          \
+        do {                                                    \
+                if (etd->debug)                                 \
+                        printk(KERN_DEBUG format, ##arg);       \
+        } while (0)
+
+/*
+ * Send a Synaptics style sliced query command
+ */
+static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
+                                unsigned char *param)
+{
+        if (psmouse_sliced_command(psmouse, c) ||
+            ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
+                pr_err("elantech.c: synaptics_send_cmd query 0x%02x failed.\n", 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("elantech.c: retrying ps2 command 0x%02x (%d).\n",
+                        command, tries);
+                msleep(ETP_PS2_COMMAND_DELAY);
+        } while (tries > 0);
+
+        if (rc)
+                pr_err("elantech.c: ps2 command 0x%02x failed.\n", command);
+
+        return rc;
+}
+
+/*
+ * Send an Elantech style special command to read a value from a register
+ */
+static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
+                                unsigned char *val)
+{
+        struct elantech_data *etd = psmouse->private;
+        unsigned char param[3];
+        int rc = 0;
+
+        if (reg < 0x10 || reg > 0x26)
+                return -1;
+
+        if (reg > 0x11 && reg < 0x20)
+                return -1;
+
+        switch (etd->hw_version) {
+        case 1:
+                if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
+                    psmouse_sliced_command(psmouse, reg) ||
+                    ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
+                        rc = -1;
+                }
+                break;
+
+        case 2:
+                if (elantech_ps2_command(psmouse,  NULL, ETP_PS2_CUSTOM_COMMAND) ||
+                    elantech_ps2_command(psmouse,  NULL, ETP_REGISTER_READ) ||
+                    elantech_ps2_command(psmouse,  NULL, ETP_PS2_CUSTOM_COMMAND) ||
+                    elantech_ps2_command(psmouse,  NULL, reg) ||
+                    elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
+                        rc = -1;
+                }
+                break;
+        }
+
+        if (rc)
+                pr_err("elantech.c: failed to read register 0x%02x.\n", reg);
+        else
+                *val = param[0];
+
+        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 < 0x10 || reg > 0x26)
+                return -1;
+
+        if (reg > 0x11 && reg < 0x20)
+                return -1;
+
+        switch (etd->hw_version) {
+        case 1:
+                if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
+                    psmouse_sliced_command(psmouse, reg) ||
+                    psmouse_sliced_command(psmouse, val) ||
+                    ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
+                        rc = -1;
+                }
+                break;
+
+        case 2:
+                if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
+                    elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
+                    elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
+                    elantech_ps2_command(psmouse, NULL, reg) ||
+                    elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
+                    elantech_ps2_command(psmouse, NULL, val) ||
+                    elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
+                        rc = -1;
+                }
+                break;
+        }
+
+        if (rc)
+                pr_err("elantech.c: 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(unsigned char *packet, int size)
+{
+        int     i;
+
+        printk(KERN_DEBUG "elantech.c: PS/2 packet [");
+        for (i = 0; i < size; i++)
+                printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
+        printk("]\n");
+}
+
+/*
+ * Interpret complete data packets and report absolute mode input events for
+ * hardware version 1. (4 byte packets)
+ */
+static void elantech_report_absolute_v1(struct psmouse *psmouse)
+{
+        struct input_dev *dev = psmouse->dev;
+        struct elantech_data *etd = psmouse->private;
+        unsigned char *packet = psmouse->packet;
+        int fingers;
+
+        if (etd->fw_version_maj == 0x01) {
+                /* 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;
+        }
+
+        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, ETP_YMAX_V1 -
+                        (((packet[1] & 0x03) << 8) | packet[3]));
+        }
+
+        input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
+        input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
+        input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
+        input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
+        input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
+
+        if ((etd->fw_version_maj == 0x01) &&
+            (etd->capabilities & 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);
+}
+
+/*
+ * 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 input_dev *dev = psmouse->dev;
+        unsigned char *packet = psmouse->packet;
+        int fingers, x1, y1, x2, y2;
+
+        /* byte 0: n1  n0   .   .   .   .   R   L */
+        fingers = (packet[0] & 0xc0) >> 6;
+        input_report_key(dev, BTN_TOUCH, fingers != 0);
+
+        switch (fingers) {
+        case 1:
+                /* byte 1: x15 x14 x13 x12 x11 x10 x9  x8
+                   byte 2: x7  x6  x5  x4  x4  x2  x1  x0 */
+                input_report_abs(dev, ABS_X, (packet[1] << 8) | packet[2]);
+                /* byte 4: y15 y14 y13 y12 y11 y10 y8  y8
+                   byte 5: y7  y6  y5  y4  y3  y2  y1  y0 */
+                input_report_abs(dev, ABS_Y, ETP_YMAX_V2 -
+                        ((packet[4] << 8) | packet[5]));
+                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];
+                /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
+                y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]);
+                /* byte 3:  .   .  by8 bx8  .   .   .   .
+                   byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 */
+                x2 = ((packet[3] & 0x10) << 4) | packet[4];
+                /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
+                y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]);
+                /* For compatibility with the X Synaptics driver scale up one
+                   coordinate and report as ordinary mouse movent */
+                input_report_abs(dev, ABS_X, x1 << 2);
+                input_report_abs(dev, ABS_Y, y1 << 2);
+                /* For compatibility with the proprietary X Elantech driver
+                   report both coordinates as hat coordinates */
+                input_report_abs(dev, ABS_HAT0X, x1);
+                input_report_abs(dev, ABS_HAT0Y, y1);
+                input_report_abs(dev, ABS_HAT1X, x2);
+                input_report_abs(dev, ABS_HAT1Y, y2);
+                break;
+        }
+
+        input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
+        input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
+        input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
+        input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
+        input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
+
+        input_sync(dev);
+}
+
+static int elantech_check_parity_v1(struct psmouse *psmouse)
+{
+        struct elantech_data *etd = psmouse->private;
+        unsigned char *packet = psmouse->packet;
+        unsigned char p1, p2, p3;
+
+        /* Parity bits are placed differently */
+        if (etd->fw_version_maj == 0x01) {
+                /* 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;
+}
+
+/*
+ * 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;
+
+        if (psmouse->pktcnt < psmouse->pktsize)
+                return PSMOUSE_GOOD_DATA;
+
+        if (etd->debug > 1)
+                elantech_packet_dump(psmouse->packet, psmouse->pktsize);
+
+        switch (etd->hw_version) {
+        case 1:
+                if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
+                        return PSMOUSE_BAD_DATA;
+
+                elantech_report_absolute_v1(psmouse);
+                break;
+
+        case 2:
+                /* We don't know how to check parity in protocol v2 */
+                elantech_report_absolute_v2(psmouse);
+                break;
+        }
+
+        return PSMOUSE_FULL_PACKET;
+}
+
+/*
+ * Put the touchpad into absolute mode
+ */
+static int elantech_set_absolute_mode(struct psmouse *psmouse)
+{
+        struct elantech_data *etd = psmouse->private;
+        unsigned char val;
+        int tries = ETP_READ_BACK_TRIES;
+        int rc = 0;
+
+        switch (etd->hw_version) {
+        case 1:
+                etd->reg_10 = 0x16;
+                etd->reg_11 = 0x8f;
+                if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
+                    elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
+                        rc = -1;
+                }
+                break;
+
+        case 2:
+                                        /* Windows driver values */
+                etd->reg_10 = 0x54;
+                etd->reg_11 = 0x88;     /* 0x8a */
+                etd->reg_21 = 0x60;     /* 0x00 */
+                if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
+                    elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
+                    elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
+                        rc = -1;
+                        break;
+                }
+                /*
+                 * Read back reg 0x10. The touchpad is probably initalising
+                 * 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("elantech.c: retrying read (%d).\n",
+                                tries);
+                        msleep(ETP_READ_BACK_DELAY);
+                } while (tries > 0);
+                if (rc)
+                        pr_err("elantech.c: failed to read back register 0x10.\n");
+                break;
+        }
+
+        if (rc)
+                pr_err("elantech.c: failed to initialise registers.\n");
+
+        return rc;
+}
+
+/*
+ * Set the appropriate event bits for the input subsystem
+ */
+static void elantech_set_input_params(struct psmouse *psmouse)
+{
+        struct input_dev *dev = psmouse->dev;
+        struct elantech_data *etd = psmouse->private;
+
+        __set_bit(EV_KEY, dev->evbit);
+        __set_bit(EV_ABS, dev->evbit);
+
+        __set_bit(BTN_LEFT, dev->keybit);
+        __set_bit(BTN_RIGHT, dev->keybit);
+
+        __set_bit(BTN_TOUCH, dev->keybit);
+        __set_bit(BTN_TOOL_FINGER, dev->keybit);
+        __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
+        __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
+
+        switch (etd->hw_version) {
+        case 1:
+                /* Rocker button */
+                if ((etd->fw_version_maj == 0x01) &&
+                    (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
+                        __set_bit(BTN_FORWARD, dev->keybit);
+                        __set_bit(BTN_BACK, dev->keybit);
+                }
+                input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0);
+                input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0);
+                break;
+
+        case 2:
+                input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
+                input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
+                input_set_abs_params(dev, ABS_HAT0X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
+                input_set_abs_params(dev, ABS_HAT0Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
+                input_set_abs_params(dev, ABS_HAT1X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
+                input_set_abs_params(dev, ABS_HAT1Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
+                break;
+        }
+}
+
+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 long value;
+        int err;
+
+        err = strict_strtoul(buf, 16, &value);
+        if (err)
+                return err;
+
+        if (value > 0xff)
+                return -EINVAL;
+
+        /* Do we need to preserve some bits for version 2 hardware too? */
+        if (etd->hw_version == 1) {
+                if (attr->reg == 0x10)
+                        /* Force absolute mode always on */
+                        value |= ETP_R10_ABSOLUTE_MODE;
+                else if (attr->reg == 0x11)
+                        /* Force 4 byte mode always on */
+                        value |= ETP_R11_4_BYTE_MODE;
+        }
+
+        if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
+                *reg = value;
+
+        return count;
+}
+
+#define ELANTECH_INT_ATTR(_name, _register)                             \
+        static struct elantech_attr_data elantech_attr_##_name = {      \
+                .field_offset = offsetof(struct elantech_data, _name),  \
+                .reg = _register,                                       \
+        };                                                              \
+        PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO,                   \
+                            &elantech_attr_##_name,                     \
+                            elantech_show_int_attr,                     \
+                            elantech_set_int_attr)
+
+ELANTECH_INT_ATTR(reg_10, 0x10);
+ELANTECH_INT_ATTR(reg_11, 0x11);
+ELANTECH_INT_ATTR(reg_20, 0x20);
+ELANTECH_INT_ATTR(reg_21, 0x21);
+ELANTECH_INT_ATTR(reg_22, 0x22);
+ELANTECH_INT_ATTR(reg_23, 0x23);
+ELANTECH_INT_ATTR(reg_24, 0x24);
+ELANTECH_INT_ATTR(reg_25, 0x25);
+ELANTECH_INT_ATTR(reg_26, 0x26);
+ELANTECH_INT_ATTR(debug, 0);
+ELANTECH_INT_ATTR(paritycheck, 0);
+
+static struct attribute *elantech_attrs[] = {
+        &psmouse_attr_reg_10.dattr.attr,
+        &psmouse_attr_reg_11.dattr.attr,
+        &psmouse_attr_reg_20.dattr.attr,
+        &psmouse_attr_reg_21.dattr.attr,
+        &psmouse_attr_reg_22.dattr.attr,
+        &psmouse_attr_reg_23.dattr.attr,
+        &psmouse_attr_reg_24.dattr.attr,
+        &psmouse_attr_reg_25.dattr.attr,
+        &psmouse_attr_reg_26.dattr.attr,
+        &psmouse_attr_debug.dattr.attr,
+        &psmouse_attr_paritycheck.dattr.attr,
+        NULL
+};
+
+static struct attribute_group elantech_attr_group = {
+        .attrs = elantech_attrs,
+};
+
+/*
+ * Use magic knock to detect Elantech touchpad
+ */
+int elantech_detect(struct psmouse *psmouse, int set_properties)
+{
+        struct ps2dev *ps2dev = &psmouse->ps2dev;
+        unsigned char param[3];
+
+        ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
+
+        if (ps2_command(ps2dev,  NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
+            ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
+                pr_err("elantech.c: 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) {
+                pr_info("elantech.c: unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
+                        param[0], param[1], param[2]);
+                return -1;
+        }
+
+        if (set_properties) {
+                psmouse->vendor = "Elantech";
+                psmouse->name = "Touchpad";
+        }
+
+        return 0;
+}
+
+/*
+ * Clean up sysfs entries when disconnecting
+ */
+static void elantech_disconnect(struct psmouse *psmouse)
+{
+        sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
+                           &elantech_attr_group);
+        kfree(psmouse->private);
+        psmouse->private = NULL;
+}
+
+/*
+ * Put the touchpad back into absolute mode when reconnecting
+ */
+static int elantech_reconnect(struct psmouse *psmouse)
+{
+        if (elantech_detect(psmouse, 0))
+                return -1;
+
+        if (elantech_set_absolute_mode(psmouse)) {
+                pr_err("elantech.c: failed to put touchpad back into absolute mode.\n");
+                return -1;
+        }
+
+        return 0;
+}
+
+/*
+ * Initialize the touchpad and create sysfs entries
+ */
+int elantech_init(struct psmouse *psmouse)
+{
+        struct elantech_data *etd;
+        int i, error;
+        unsigned char param[3];
+
+        etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
+        psmouse->private = etd;
+        if (!etd)
+                return -1;
+
+        etd->parity[0] = 1;
+        for (i = 1; i < 256; i++)
+                etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
+
+        /*
+         * Find out what version hardware this is
+         */
+        if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
+                pr_err("elantech.c: failed to query firmware version.\n");
+                goto init_fail;
+        }
+        pr_info("elantech.c: Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
+                param[0], param[1], param[2]);
+        etd->fw_version_maj = param[0];
+        etd->fw_version_min = param[2];
+
+        /*
+         * Assume every version greater than this is new EeePC style
+         * hardware with 6 byte packets
+         */
+        if (etd->fw_version_maj >= 0x02 && etd->fw_version_min >= 0x30) {
+                etd->hw_version = 2;
+                /* For now show extra debug information */
+                etd->debug = 1;
+                /* Don't know how to do parity checking for version 2 */
+                etd->paritycheck = 0;
+        } else {
+                etd->hw_version = 1;
+                etd->paritycheck = 1;
+        }
+        pr_info("elantech.c: assuming hardware version %d, firmware version %d.%d\n",
+                etd->hw_version, etd->fw_version_maj, etd->fw_version_min);
+
+        if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) {
+                pr_err("elantech.c: failed to query capabilities.\n");
+                goto init_fail;
+        }
+        pr_info("elantech.c: Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
+                param[0], param[1], param[2]);
+        etd->capabilities = param[0];
+
+        if (elantech_set_absolute_mode(psmouse)) {
+                pr_err("elantech.c: failed to put touchpad into absolute mode.\n");
+                goto init_fail;
+        }
+
+        elantech_set_input_params(psmouse);
+
+        error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
+                                   &elantech_attr_group);
+        if (error) {
+                pr_err("elantech.c: failed to create sysfs attributes, error: %d.\n",
+                        error);
+                goto init_fail;
+        }
+
+        psmouse->protocol_handler = elantech_process_byte;
+        psmouse->disconnect = elantech_disconnect;
+        psmouse->reconnect = elantech_reconnect;
+        psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
+
+        return 0;
+
+ init_fail:
+        kfree(etd);
+        return -1;
+}