[PATCH v2] Input: add i2c/smbus driver for elan touchpad
From: Duson Lin
Date: Tue Dec 17 2013 - 22:47:11 EST
This driver adds support for elan i2c/smbus touchpad found on some laptops PC
Signed-off-by: Duson Lin <dusonlin@xxxxxxxxxx>
---
drivers/input/mouse/Kconfig | 10 +
drivers/input/mouse/Makefile | 1 +
drivers/input/mouse/elan_i2c.c | 890 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 901 insertions(+)
create mode 100644 drivers/input/mouse/elan_i2c.c
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index effa9c5..095eccc 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -215,6 +215,16 @@ config MOUSE_CYAPA
To compile this driver as a module, choose M here: the module will be
called cyapa.
+config MOUSE_ELAN_I2C
+ tristate "ELAN I2C Touchpad support"
+ depends on I2C
+ help
+ This driver adds support for Elan I2C Trackpads.
+ Say Y here if you have a ELAN I2C Touchpad.
+
+ To compile this driver as a module, choose M here: the module will be
+ called elan_i2c.
+
config MOUSE_INPORT
tristate "InPort/MS/ATIXL busmouse"
depends on ISA
diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index c25efdb..24a12a6 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_MOUSE_APPLETOUCH) += appletouch.o
obj-$(CONFIG_MOUSE_ATARI) += atarimouse.o
obj-$(CONFIG_MOUSE_BCM5974) += bcm5974.o
obj-$(CONFIG_MOUSE_CYAPA) += cyapa.o
+obj-$(CONFIG_MOUSE_ELAN_I2C) += elan_i2c.o
obj-$(CONFIG_MOUSE_GPIO) += gpio_mouse.o
obj-$(CONFIG_MOUSE_INPORT) += inport.o
obj-$(CONFIG_MOUSE_LOGIBM) += logibm.o
diff --git a/drivers/input/mouse/elan_i2c.c b/drivers/input/mouse/elan_i2c.c
new file mode 100644
index 0000000..f7bfa22
--- /dev/null
+++ b/drivers/input/mouse/elan_i2c.c
@@ -0,0 +1,890 @@
+ï/*
+ * Elan I2C/SMBus Touchpad driver
+ *
+ * Copyright (c) 2013 ELAN Microelectronics Corp.
+ *
+ * Author: ææç (Duson Lin) <dusonlin@xxxxxxxxxx>
+ * Version: 1.4.6
+ *
+ * Based on cyapa driver:
+ * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
+ * copyright (c) 2011-2012 Google, Inc.
+ *
+ * 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/device.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/input/mt.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+#include <linux/cdev.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/sched.h>
+#include <linux/input.h>
+#include <linux/uaccess.h>
+#include <linux/jiffies.h>
+
+#define DRIVER_NAME "elan_i2c"
+#define ELAN_DRIVER_VERSION "1.4.6"
+#define ETP_PRESSURE_OFFSET 25
+#define ETP_MAX_PRESSURE 255
+#define ETP_FWIDTH_REDUCE 90
+#define ETP_FINGER_WIDTH 15
+
+#define ELAN_ADAPTER_FUNC_NONE 0
+#define ELAN_ADAPTER_FUNC_I2C 1
+#define ELAN_ADAPTER_FUNC_SMBUS 2
+#define ELAN_ADAPTER_FUNC_BOTH 3
+
+/* Length of Elan touchpad information */
+#define ETP_INF_LENGTH 2
+#define ETP_MAX_FINGERS 5
+#define ETP_FINGER_DATA_LEN 5
+#define ETP_REPORT_ID 0x5D
+#define ETP_MAX_REPORT_LEN 34
+#define ETP_ENABLE_ABS 0x0001
+#define ETP_ENABLE_CALIBRATE 0x0002
+#define ETP_DISABLE_CALIBRATE 0x0000
+
+/* Elan smbus command */
+#define ETP_SMBUS_IAP_CMD 0x00
+#define ETP_SMBUS_ENABLE_TP 0x20
+#define ETP_SMBUS_SLEEP_CMD 0x21
+#define ETP_SMBUS_IAP_PASSWORD_WRITE 0x29
+#define ETP_SMBUS_IAP_PASSWORD_READ 0x80
+#define ETP_SMBUS_WRITE_FW_BLOCK 0x2A
+#define ETP_SMBUS_IAP_RESET_CMD 0x2B
+#define ETP_SMBUS_RANGE_CMD 0xA0
+#define ETP_SMBUS_FW_VERSION_CMD 0xA1
+#define ETP_SMBUS_XY_TRACENUM_CMD 0xA2
+#define ETP_SMBUS_SM_VERSION_CMD 0xA3
+#define ETP_SMBUS_UNIQUEID_CMD 0xA3
+#define ETP_SMBUS_RESOLUTION_CMD 0xA4
+#define ETP_SMBUS_HELLOPACKET_CMD 0xA7
+#define ETP_SMBUS_PACKET_QUERY 0xA8
+#define ETP_SMBUS_IAP_VERSION_CMD 0xAC
+#define ETP_SMBUS_IAP_CTRL_CMD 0xAD
+#define ETP_SMBUS_IAP_CHECKSUM_CMD 0xAE
+#define ETP_SMBUS_FW_CHECKSUM_CMD 0xAF
+#define ETP_SMBUS_MAX_BASELINE_CMD 0xC3
+#define ETP_SMBUS_MIN_BASELINE_CMD 0xC4
+#define ETP_SMBUS_CALIBRATE_QUERY 0xC5
+#define ETP_SMBUS_REPORT_LEN 32
+#define ETP_SMBUS_FINGER_DATA_OFFSET 2
+#define ETP_SMBUS_HELLOPACKET_LEN 5
+#define ETP_SMBUS_IAP_PASSWORD 0x1234
+#define ETP_SMBUS_IAP_MODE_ON (1<<6)
+
+/* Elan i2c command */
+#define ETP_I2C_RESET 0x0100
+#define ETP_I2C_WAKE_UP 0x0800
+#define ETP_I2C_SLEEP 0x0801
+#define ETP_I2C_DESC_CMD 0x0001
+#define ETP_I2C_REPORT_DESC_CMD 0x0002
+#define ETP_I2C_STAND_CMD 0x0005
+#define ETP_I2C_UNIQUEID_CMD 0x0101
+#define ETP_I2C_FW_VERSION_CMD 0x0102
+#define ETP_I2C_SM_VERSION_CMD 0x0103
+#define ETP_I2C_XY_TRACENUM_CMD 0x0105
+#define ETP_I2C_MAX_X_AXIS_CMD 0x0106
+#define ETP_I2C_MAX_Y_AXIS_CMD 0x0107
+#define ETP_I2C_RESOLUTION_CMD 0x0108
+#define ETP_I2C_IAP_VERSION_CMD 0x0110
+#define ETP_I2C_SET_CMD 0x0300
+#define ETP_I2C_MAX_BASELINE_CMD 0x0306
+#define ETP_I2C_MIN_BASELINE_CMD 0x0307
+#define ETP_I2C_FW_CHECKSUM_CMD 0x030F
+#define ETP_I2C_IAP_CTRL_CMD 0x0310
+#define ETP_I2C_IAP_CMD 0x0311
+#define ETP_I2C_IAP_RESET_CMD 0x0314
+#define ETP_I2C_IAP_CHECKSUM_CMD 0x0315
+#define ETP_I2C_CALIBRATE_CMD 0x0316
+#define ETP_I2C_REPORT_LEN 34
+#define ETP_I2C_FINGER_DATA_OFFSET 4
+#define ETP_I2C_REPORT_ID_OFFSET 2
+#define ETP_I2C_DESC_LENGTH 30
+#define ETP_I2C_REPORT_DESC_LENGTH 158
+#define ETP_I2C_IAP_PASSWORD 0x1EA5
+#define ETP_I2C_IAP_RESET 0xF0F0
+#define ETP_I2C_MAIN_MODE_ON (1<<9)
+#define ETP_I2C_IAP_REG_L 0x01
+#define ETP_I2C_IAP_REG_H 0x06
+
+/* The main device structure */
+struct elan_tp_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ unsigned int max_x;
+ unsigned int max_y;
+ unsigned int width_x;
+ unsigned int width_y;
+ unsigned int irq;
+ u16 unique_id;
+ u16 fw_version;
+ u16 sm_version;
+ u16 iap_version;
+ bool smbus;
+};
+
+/*
+ *******************************************************************
+ * Elan smbus interface
+ *******************************************************************
+ */
+static int elan_smbus_initialize(struct i2c_client *client)
+{
+ u8 check[ETP_SMBUS_HELLOPACKET_LEN] = {0x55, 0x55, 0x55, 0x55, 0x55};
+ u8 values[ETP_SMBUS_HELLOPACKET_LEN] = {0, 0, 0, 0, 0};
+ int ret;
+
+ /* Get hello packet */
+ ret = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_HELLOPACKET_CMD, values);
+ if (ret != ETP_SMBUS_HELLOPACKET_LEN) {
+ dev_err(&client->dev, "hello packet length fail\n");
+ return -1;
+ }
+
+ /* compare hello packet */
+ if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) {
+ dev_err(&client->dev, "hello packet fail [%x %x %x %x %x]\n",
+ values[0], values[1], values[2], values[3], values[4]);
+ return -1;
+ }
+
+ /* enable tp */
+ ret = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP);
+ return ret;
+}
+
+static int elan_smbus_enable_absolute_mode(struct i2c_client *client)
+{
+ u8 cmd[4] = {0x00, 0x07, 0x00, ETP_ENABLE_ABS};
+
+ return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD, 4, cmd);
+}
+
+/*
+ ******************************************************************
+ * Elan i2c interface
+ ******************************************************************
+ */
+static int elan_i2c_read_block(struct i2c_client *client,
+ u16 reg, u8 *val, u16 len)
+{
+ struct i2c_msg msgs[2];
+ u8 buf[2];
+ int ret;
+
+ buf[0] = reg & 0xff;
+ buf[1] = (reg >> 8) & 0xff;
+
+ msgs[0].addr = client->addr;
+ msgs[0].flags = client->flags & I2C_M_TEN;
+ msgs[0].len = 2;
+ msgs[0].buf = buf;
+
+ msgs[1].addr = client->addr;
+ msgs[1].flags = client->flags & I2C_M_TEN;
+ msgs[1].flags |= I2C_M_RD;
+ msgs[1].len = len;
+ msgs[1].buf = val;
+
+ ret = i2c_transfer(client->adapter, msgs, 2);
+ return ret != 2 ? -EIO : 0;
+}
+
+static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val)
+{
+ int retval;
+
+ retval = elan_i2c_read_block(client, reg, val, ETP_INF_LENGTH);
+ if (retval < 0) {
+ dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg);
+ return retval;
+ }
+ return 0;
+}
+
+static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd)
+{
+ struct i2c_msg msg;
+ u8 buf[4];
+ int ret;
+
+ buf[0] = reg & 0xff;
+ buf[1] = (reg >> 8) & 0xff;
+ buf[2] = cmd & 0xff;
+ buf[3] = (cmd >> 8) & 0xff;
+
+ msg.addr = client->addr;
+ msg.flags = client->flags & I2C_M_TEN;
+ msg.len = 4;
+ msg.buf = buf;
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ return ret != 1 ? -EIO : 0;
+}
+
+static int elan_i2c_reset(struct i2c_client *client)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
+ ETP_I2C_RESET);
+}
+
+static int elan_i2c_wake_up(struct i2c_client *client)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
+ ETP_I2C_WAKE_UP);
+}
+
+static int elan_i2c_sleep(struct i2c_client *client)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
+ ETP_I2C_SLEEP);
+}
+
+static int elan_i2c_enable_absolute_mode(struct i2c_client *client)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD,
+ ETP_ENABLE_ABS);
+}
+
+static int elan_i2c_get_desc(struct i2c_client *client, u8 *val)
+{
+ return elan_i2c_read_block(client, ETP_I2C_DESC_CMD, val,
+ ETP_I2C_DESC_LENGTH);
+}
+
+static int elan_i2c_get_report_desc(struct i2c_client *client, u8 *val)
+{
+ return elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
+ val, ETP_I2C_REPORT_DESC_LENGTH);
+}
+
+static int elan_i2c_initialize(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ int rc;
+ u8 val[256];
+
+ rc = elan_i2c_reset(client);
+ if (rc < 0) {
+ dev_err(dev, "device reset failed.\n");
+ return -1;
+ }
+
+ /* wait for get reset return flag */
+ msleep(100);
+ /* get reset return flag 0000 */
+ rc = i2c_master_recv(client, val, ETP_INF_LENGTH);
+ if (rc < 0) {
+ dev_err(dev, "get device reset return value failed.\n");
+ return -1;
+ }
+
+ rc = elan_i2c_get_desc(client, val);
+ if (rc < 0) {
+ dev_err(dev, "cannot get device descriptor.\n");
+ return -1;
+ }
+
+ rc = elan_i2c_get_report_desc(client, val);
+ if (rc < 0) {
+ dev_err(dev, "fetching report descriptor failed.\n");
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ ******************************************************************
+ * General functions
+ ******************************************************************
+ */
+/*
+ * (value from firmware) * 10 + 790 = dpi
+ * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
+ */
+static unsigned int elan_convert_res(char val)
+{
+ int res;
+ if (val & 0x80) {
+ val = ~val + 1;
+ res = (790 - val * 10) * 10 / 254;
+ } else
+ res = (val * 10 + 790) * 10 / 254;
+ return res;
+}
+
+static int elan_get_iap_version(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_IAP_VERSION_CMD, val);
+ ret = val[2];
+ } else {
+ elan_i2c_read_cmd(data->client,
+ ETP_I2C_IAP_VERSION_CMD, val);
+ ret = val[0];
+ }
+ return ret;
+}
+
+static int elan_get_x_max(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_RANGE_CMD, val);
+ ret = (0x0f & val[0]) << 8 | val[1];
+ } else {
+ elan_i2c_read_cmd(data->client,
+ ETP_I2C_MAX_X_AXIS_CMD, val);
+ ret = (0x0f & val[1]) << 8 | val[0];
+ }
+ return ret;
+}
+
+static int elan_get_y_max(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_RANGE_CMD, val);
+ ret = (0xf0 & val[0]) << 4 | val[2];
+ } else {
+ elan_i2c_read_cmd(data->client,
+ ETP_I2C_MAX_Y_AXIS_CMD, val);
+ ret = (0x0f & val[1]) << 8 | val[0];
+ }
+ return ret;
+}
+
+static int elan_get_x_tracenum(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_XY_TRACENUM_CMD, val);
+ ret = (val[1] - 1);
+ } else {
+ elan_i2c_read_cmd(data->client,
+ ETP_I2C_XY_TRACENUM_CMD, val);
+ ret = (val[0] - 1);
+ }
+ return ret;
+}
+
+static int elan_get_y_tracenum(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_XY_TRACENUM_CMD, val);
+ ret = (val[2] - 1);
+ } else {
+ ret = elan_i2c_read_cmd(data->client,
+ ETP_I2C_XY_TRACENUM_CMD, val);
+ ret = (val[1] - 1);
+ }
+ return ret;
+}
+
+static int elan_get_fw_version(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_FW_VERSION_CMD, val);
+ ret = val[2];
+ } else {
+ elan_i2c_read_cmd(data->client,
+ ETP_I2C_FW_VERSION_CMD, val);
+ ret = val[0];
+ }
+ return ret;
+}
+
+static int elan_get_sm_version(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus)
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_SM_VERSION_CMD, val);
+ else
+ elan_i2c_read_block(data->client,
+ ETP_I2C_SM_VERSION_CMD, val, 1);
+ ret = val[0];
+ return ret;
+}
+
+static int elan_get_unique_id(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_UNIQUEID_CMD, val);
+ ret = val[1];
+ } else {
+ elan_i2c_read_cmd(data->client,
+ ETP_I2C_UNIQUEID_CMD, val);
+ ret = val[0];
+ }
+ return ret;
+}
+
+static int elan_get_x_resolution(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_RESOLUTION_CMD, val);
+ ret = elan_convert_res(val[1] & 0x0F);
+ } else {
+ elan_i2c_read_cmd(data->client,
+ ETP_I2C_RESOLUTION_CMD, val);
+ ret = elan_convert_res(val[0]);
+ }
+ return ret;
+}
+
+static int elan_get_y_resolution(struct elan_tp_data *data)
+{
+ int ret;
+ u8 val[3];
+ if (data->smbus) {
+ i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_RESOLUTION_CMD, val);
+ ret = elan_convert_res((val[1] & 0xF0) >> 4);
+ } else {
+ elan_i2c_read_cmd(data->client,
+ ETP_I2C_RESOLUTION_CMD, val);
+ ret = elan_convert_res(val[1]);
+ }
+ return ret;
+}
+
+static int elan_initialize(struct elan_tp_data *data)
+{
+ int ret;
+ if (data->smbus) {
+ ret = elan_smbus_initialize(data->client);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "device initialize failed.\n");
+ goto err_initialize;
+ }
+
+ ret = elan_smbus_enable_absolute_mode(data->client);
+ if (ret < 0)
+ dev_err(&data->client->dev,
+ "cannot switch to absolute mode.\n");
+ } else {
+ ret = elan_i2c_initialize(data->client);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "device initialize failed.\n");
+ goto err_initialize;
+ }
+
+ ret = elan_i2c_enable_absolute_mode(data->client);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "cannot switch to absolute mode.\n");
+ goto err_initialize;
+ }
+
+ ret = elan_i2c_wake_up(data->client);
+ if (ret < 0)
+ dev_err(&data->client->dev,
+ "device wake up failed.\n");
+ }
+err_initialize:
+ return ret;
+}
+
+
+/*
+ ******************************************************************
+ * Elan isr functions
+ ******************************************************************
+ */
+static int elan_check_packet(struct elan_tp_data *data, u8 *packet)
+{
+ u8 rid;
+
+ if (data->smbus)
+ rid = packet[0];
+ else
+ rid = packet[ETP_I2C_REPORT_ID_OFFSET];
+
+ /* check report id */
+ if (rid != ETP_REPORT_ID) {
+ dev_err(&data->client->dev, "report id [%x] fail.\n", rid);
+ return -1;
+ }
+ return 0;
+}
+
+static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
+{
+ struct input_dev *input = data->input;
+ u8 *finger_data;
+ bool finger_on;
+ int pos_x, pos_y;
+ int pressure, mk_x, mk_y;
+ int i, area_x, area_y, major, minor, new_pressure;
+ int finger_count = 0;
+ int btn_click;
+ u8 tp_info;
+
+ if (data->smbus) {
+ finger_data = &packet[ETP_SMBUS_FINGER_DATA_OFFSET];
+ tp_info = packet[1];
+ } else {
+ finger_data = &packet[ETP_I2C_FINGER_DATA_OFFSET];
+ tp_info = packet[3];
+ }
+
+ btn_click = (tp_info & 0x01);
+ for (i = 0; i < ETP_MAX_FINGERS; i++) {
+ finger_on = (tp_info >> (3 + i)) & 0x01;
+
+ /* analyze touched finger raw data*/
+ if (finger_on) {
+ pos_x = ((finger_data[0] & 0xf0) << 4) |
+ finger_data[1];
+ pos_y = ((finger_data[0] & 0x0f) << 8) |
+ finger_data[2];
+ pos_y = data->max_y - pos_y;
+ mk_x = (finger_data[3] & 0x0f);
+ mk_y = (finger_data[3] >> 4);
+ pressure = finger_data[4];
+
+ /*
+ * to avoid fat finger be as palm, so reduce the
+ * width x and y per trace
+ */
+ area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
+ area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
+
+ major = max(area_x, area_y);
+ minor = min(area_x, area_y);
+
+ new_pressure = pressure + ETP_PRESSURE_OFFSET;
+ if (new_pressure > ETP_MAX_PRESSURE)
+ new_pressure = ETP_MAX_PRESSURE;
+
+ input_mt_slot(input, i);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER,
+ true);
+ input_report_abs(input, ABS_MT_POSITION_X, pos_x);
+ input_report_abs(input, ABS_MT_POSITION_Y, pos_y);
+ input_report_abs(input, ABS_MT_PRESSURE, new_pressure);
+ input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
+ input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
+ finger_data += ETP_FINGER_DATA_LEN;
+ finger_count++;
+ } else {
+ input_mt_slot(input, i);
+ input_mt_report_slot_state(input,
+ MT_TOOL_FINGER, false);
+ }
+ }
+
+ input_report_key(input, BTN_LEFT, (btn_click == 1));
+ input_mt_report_pointer_emulation(input, true);
+ input_sync(input);
+}
+
+static irqreturn_t elan_isr(int irq, void *dev_id)
+{
+ struct elan_tp_data *data = dev_id;
+ u8 raw[ETP_MAX_REPORT_LEN];
+ int retval;
+ int report_len;
+
+ if (data->smbus) {
+ report_len = ETP_SMBUS_REPORT_LEN;
+ retval = i2c_smbus_read_block_data(data->client,
+ ETP_SMBUS_PACKET_QUERY,
+ raw);
+ } else {
+ report_len = ETP_I2C_REPORT_LEN;
+ retval = i2c_master_recv(data->client, raw, report_len);
+ }
+
+ if (retval != report_len) {
+ dev_err(&data->client->dev, "wrong packet len(%d)", retval);
+ goto elan_isr_end;
+ }
+
+ if (elan_check_packet(data, raw) < 0) {
+ dev_err(&data->client->dev, "wrong packet format.");
+ goto elan_isr_end;
+ }
+ elan_report_absolute(data, raw);
+
+elan_isr_end:
+ return IRQ_HANDLED;
+}
+
+/*
+ ******************************************************************
+ * Elan initial functions
+ ******************************************************************
+ */
+static int elan_input_dev_create(struct elan_tp_data *data)
+{
+ struct i2c_client *client = data->client;
+ struct input_dev *input;
+ unsigned int x_res, y_res;
+ int ret, max_width, min_width;
+
+ data->input = input = input_allocate_device();
+ if (!input)
+ return -ENOMEM;
+ input->name = "Elan Touchpad";
+ input->id.bustype = BUS_I2C;
+ input->dev.parent = &data->client->dev;
+
+ __set_bit(EV_ABS, input->evbit);
+ __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+ __set_bit(BTN_LEFT, input->keybit);
+
+ data->unique_id = elan_get_unique_id(data);
+ data->fw_version = elan_get_fw_version(data);
+ data->sm_version = elan_get_sm_version(data);
+ data->iap_version = elan_get_iap_version(data);
+ data->max_x = elan_get_x_max(data);
+ data->max_y = elan_get_y_max(data);
+ data->width_x = data->max_x / elan_get_x_tracenum(data);
+ data->width_y = data->max_y / elan_get_y_tracenum(data);
+ x_res = elan_get_x_resolution(data);
+ y_res = elan_get_y_resolution(data);
+ max_width = max(data->width_x, data->width_y);
+ min_width = min(data->width_x, data->width_y);
+
+ dev_dbg(&client->dev,
+ "Elan Touchpad Information:\n"
+ " Module unique ID: 0x%04x\n"
+ " Firmware Version: 0x%04x\n"
+ " Sample Version: 0x%04x\n"
+ " IAP Version: 0x%04x\n"
+ " Max ABS X,Y: %d,%d\n"
+ " Width X,Y: %d,%d\n"
+ " Resolution X,Y: %d,%d (dots/mm)\n",
+ data->unique_id,
+ data->fw_version,
+ data->sm_version,
+ data->iap_version,
+ data->max_x, data->max_y,
+ data->width_x, data->width_y,
+ x_res, y_res);
+
+ input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
+ input_abs_set_res(input, ABS_X, x_res);
+ input_abs_set_res(input, ABS_Y, y_res);
+ input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
+ input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
+
+ /* handle pointer emulation and unused slots in core */
+ ret = input_mt_init_slots(input, ETP_MAX_FINGERS,
+ INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
+ if (ret) {
+ dev_err(&client->dev, "allocate MT slots failed, %d\n", ret);
+ goto err_free_device;
+ }
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
+ input_abs_set_res(input, ABS_MT_POSITION_X, x_res);
+ input_abs_set_res(input, ABS_MT_POSITION_Y, y_res);
+ input_set_abs_params(input, ABS_MT_PRESSURE, 0,
+ ETP_MAX_PRESSURE, 0, 0);
+ input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
+ ETP_FINGER_WIDTH * max_width, 0, 0);
+ input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
+ ETP_FINGER_WIDTH * min_width, 0, 0);
+
+ /* Register the device in input subsystem */
+ ret = input_register_device(input);
+ if (ret) {
+ dev_err(&client->dev, "input_dev register failed, %d\n", ret);
+ goto err_free_device;
+ }
+
+ return 0;
+
+err_free_device:
+ input_free_device(input);
+ return ret;
+}
+
+static u8 elan_check_adapter_functionality(struct i2c_client *client)
+{
+ u8 ret = ELAN_ADAPTER_FUNC_NONE;
+
+ if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ ret |= ELAN_ADAPTER_FUNC_I2C;
+ if (i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK))
+ ret |= ELAN_ADAPTER_FUNC_SMBUS;
+ return ret;
+}
+
+static int elan_probe(struct i2c_client *client,
+ const struct i2c_device_id *dev_id)
+{
+ struct elan_tp_data *data;
+ int ret;
+ u8 adapter_func;
+ union i2c_smbus_data dummy;
+ struct device *dev = &client->dev;
+
+ adapter_func = elan_check_adapter_functionality(client);
+ if (adapter_func == ELAN_ADAPTER_FUNC_NONE) {
+ dev_err(dev, "not a supported I2C/SMBus adapter\n");
+ return -EIO;
+ }
+
+ /* Make sure there is something at this address */
+ if (i2c_smbus_xfer(client->adapter, client->addr, 0,
+ I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
+ return -ENODEV;
+
+ data = kzalloc(sizeof(struct elan_tp_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* check protocol type */
+ if (adapter_func == ELAN_ADAPTER_FUNC_SMBUS)
+ data->smbus = true;
+ else
+ data->smbus = false;
+ data->client = client;
+ data->irq = client->irq;
+
+ ret = request_threaded_irq(client->irq, NULL, elan_isr,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ client->name, data);
+ if (ret < 0) {
+ dev_err(&client->dev, "cannot register irq=%d\n",
+ client->irq);
+ goto err_irq;
+ }
+
+ /* initial elan touch pad */
+ ret = elan_initialize(data);
+ if (ret < 0)
+ goto err_init;
+
+ /* create input device */
+ ret = elan_input_dev_create(data);
+ if (ret < 0)
+ goto err_input_dev;
+
+ device_init_wakeup(&client->dev, 1);
+ i2c_set_clientdata(client, data);
+ return 0;
+
+err_input_dev:
+err_init:
+ free_irq(data->irq, data);
+err_irq:
+ kfree(data);
+ dev_err(&client->dev, "Elan Trackpad probe fail!\n");
+ return ret;
+}
+
+static int elan_remove(struct i2c_client *client)
+{
+ struct elan_tp_data *data = i2c_get_clientdata(client);
+ free_irq(data->irq, data);
+ input_unregister_device(data->input);
+ kfree(data);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int elan_suspend(struct device *dev)
+{
+ int ret = 0;
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ disable_irq(data->irq);
+ if (data->smbus)
+ ret = i2c_smbus_write_byte(data->client,
+ ETP_SMBUS_SLEEP_CMD);
+ else
+ ret = elan_i2c_sleep(data->client);
+
+ if (ret < 0)
+ dev_err(dev, "suspend mode failed, %d\n", ret);
+
+ return ret;
+}
+
+static int elan_resume(struct device *dev)
+{
+ int ret = 0;
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ ret = elan_initialize(data);
+ if (ret < 0)
+ dev_err(dev, "resume active power failed, %d\n", ret);
+
+ enable_irq(data->irq);
+ return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
+
+static const struct i2c_device_id elan_id[] = {
+ { DRIVER_NAME, 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, elan_id);
+
+static struct i2c_driver elan_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .pm = &elan_pm_ops,
+ },
+ .probe = elan_probe,
+ .remove = elan_remove,
+ .id_table = elan_id,
+};
+
+module_i2c_driver(elan_driver);
+
+MODULE_AUTHOR("Duson Lin <dusonlin@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
+MODULE_LICENSE("GPL");
--
1.7.10.4
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