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Message-Id: <1382498110-4782-1-git-send-email-duson.lin@msa.hinet.net>
Date: Wed, 23 Oct 2013 11:15:10 +0800
From: Duson Lin <duson.lin@....hinet.net>
To: linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
dmitry.torokhov@...il.com
Cc: agnescheng@...gle.com, phoenix@....com.tw,
Duson Lin <dusonlin@....com.tw>
Subject: [PATCH] Input: add i2c driver for elan i2c touchpad
From: Duson Lin <dusonlin@....com.tw>
This driver adds support for elan i2c touchpad found on some laptops.
---
drivers/input/mouse/Kconfig | 10 +
drivers/input/mouse/Makefile | 1 +
drivers/input/mouse/elan_i2c.c | 1439 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 1450 insertions(+)
create mode 100644 drivers/input/mouse/elan_i2c.c
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index effa9c5..8ad4b38 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..bc6e957
--- /dev/null
+++ b/drivers/input/mouse/elan_i2c.c
@@ -0,0 +1,1439 @@
+/*
+ * Elan I2C Touchpad driver
+ *
+ * Copyright (c) 2013 ELAN Microelectronics Corp.
+ *
+ * Author: 林政維 (Duson Lin) <dusonlin@....com.tw>
+ * Version: 1.4.5
+ *
+ * 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 "1.4.5"
+#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
+
+/* 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 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
+
+/* IAP F/W updater */
+#define ETP_FW_NAME "elan_i2c.bin"
+#define ETP_FW_IAP_REG_L 0x01
+#define ETP_FW_IAP_REG_H 0x06
+#define ETP_IAP_VERSION_ADDR 0x0082
+#define ETP_IAP_START_ADDR 0x0083
+#define ETP_IAP_RESET 0xF0F0
+#define ETP_ENABLE_FWUPDATE 0x1EA5
+#define ETP_FW_IAP_MODE_ON (1<<9)
+#define ETP_FW_IAP_PAGE_ERR (1<<5)
+#define ETP_FW_IAP_INTERFACE_ERR (1<<4)
+#define ETP_FW_PAGE_SIZE 64
+#define ETP_FW_PAGE_COUNT 768
+#define ETP_FW_SIZE (ETP_FW_PAGE_SIZE * ETP_FW_PAGE_COUNT)
+enum {IAP_MODE = 0, MAIN_MODE};
+
+struct dbfs_data {
+ bool bfetch;
+ u8 buffer[ETP_MAX_REPORT_LEN];
+};
+
+/* 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;
+
+ /* fields required for IAP firmware updater */
+ u16 unique_id;
+ u16 fw_version;
+ u16 sm_version;
+ u16 iap_version;
+ bool updated_fw;
+ u16 iap_start_addr;
+ u8 adapter_func;
+
+ /* irq wake is enabled */
+ bool irq_wake;
+ bool enable_detail_info;
+
+ /* fields required for debug fs */
+ struct mutex dbfs_mutex;
+ struct dentry *dbfs_root;
+ struct dbfs_data dbfs_buffer;
+};
+
+u8 val[256];
+
+static int elan_i2c_read_block(struct i2c_client *client,
+ u16 reg, u8 *val, u16 len);
+static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val);
+static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd);
+static int elan_i2c_reinitialize(struct i2c_client *client);
+static int elan_i2c_enable_calibrate(struct i2c_client *client);
+static int elan_i2c_disable_calibrate(struct i2c_client *client);
+
+/*
+ **************************************************************
+ * debugfs interface
+ **************************************************************
+*/
+static int elan_dbfs_open(struct inode *inode, struct file *file)
+{
+ int retval;
+ struct elan_tp_data *data = inode->i_private;
+
+ if (!data)
+ return -ENODEV;
+
+ retval = mutex_lock_interruptible(&data->dbfs_mutex);
+ if (retval)
+ return retval;
+
+ if (!kobject_get(&data->client->dev.kobj)) {
+ retval = -ENODEV;
+ goto dbfs_out;
+ }
+
+ file->private_data = data;
+dbfs_out:
+ mutex_unlock(&data->dbfs_mutex);
+ return 0;
+}
+
+static int elan_dbfs_release(struct inode *inode, struct file *file)
+{
+ struct elan_tp_data *data = file->private_data;
+ int retval;
+ if (!data)
+ return -ENODEV;
+
+ retval = mutex_lock_interruptible(&data->dbfs_mutex);
+ if (retval)
+ return retval;
+ file->private_data = NULL;
+ kobject_put(&data->client->dev.kobj);
+ mutex_unlock(&data->dbfs_mutex);
+ return 0;
+}
+
+
+static ssize_t elan_dbfs_read(struct file *file,
+ char __user *buffer, size_t count, loff_t *ppos)
+{
+ struct elan_tp_data *data = file->private_data;
+ int retval;
+ if (!data)
+ return -ENODEV;
+
+ retval = mutex_lock_interruptible(&data->dbfs_mutex);
+ if (retval)
+ return -EFAULT;
+ if (data->dbfs_buffer.bfetch == false) {
+ if (!copy_to_user(buffer, data->dbfs_buffer.buffer, count)) {
+ data->dbfs_buffer.bfetch = true;
+ retval = count;
+ } else {
+ retval = -2;
+ }
+ } else {
+ retval = -4;
+ }
+ mutex_unlock(&data->dbfs_mutex);
+ return retval;
+}
+
+static ssize_t elan_dbfs_write(struct file *file,
+ const char __user *buffer, size_t count, loff_t *ppos)
+{
+ struct elan_tp_data *data = file->private_data;
+ int retval;
+ if (!data)
+ return -ENODEV;
+
+ retval = mutex_lock_interruptible(&data->dbfs_mutex);
+ if (retval)
+ return -EFAULT;
+ retval = count;
+ mutex_unlock(&data->dbfs_mutex);
+ return retval;
+}
+
+static long elan_dbfs_ioctrl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int retval = 0;
+ struct elan_tp_data *data = file->private_data;
+
+ retval = mutex_lock_interruptible(&data->dbfs_mutex);
+ if (retval)
+ return retval;
+ mutex_unlock(&data->dbfs_mutex);
+ return retval;
+}
+
+static const struct file_operations elan_debug_fops = {
+ .open = elan_dbfs_open,
+ .release = elan_dbfs_release,
+ .read = elan_dbfs_read,
+ .write = elan_dbfs_write,
+ .unlocked_ioctl = elan_dbfs_ioctrl
+};
+
+static int elan_dbfs_init(struct elan_tp_data *data)
+{
+ /* Create a global debugfs root for all elan devices */
+ /* sys/kernel/debug/elan */
+ data->dbfs_root = debugfs_create_dir("elan", NULL);
+ if (!data->dbfs_root) {
+ dev_err(&data->client->dev, "cannot create dbfs_root.\n");
+ return -ENODEV;
+ }
+ mutex_init(&data->dbfs_mutex);
+
+ debugfs_create_file(DRIVER_NAME, 0777,
+ data->dbfs_root, data, &elan_debug_fops);
+ data->dbfs_buffer.bfetch = false;
+ return 0;
+}
+
+/**********************************************************
+ * IAP firmware updater related routines *
+ **********************************************************
+*/
+
+static int elan_iap_getmode(struct elan_tp_data *data)
+{
+ u16 constant;
+ int retval = 0;
+ struct i2c_client *client = data->client;
+
+ retval = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
+ if (retval < 0)
+ return false;
+
+ constant = le16_to_cpup((__le16 *)val);
+ dev_dbg(&client->dev, "control reg: 0x%04x.\n", constant);
+
+ if (constant & ETP_FW_IAP_MODE_ON)
+ return MAIN_MODE;
+
+ return IAP_MODE;
+}
+
+static int elan_iap_checksum(struct elan_tp_data *data)
+{
+ int retval = 0;
+ u16 checksum = -1;
+ struct i2c_client *client = data->client;
+
+ retval = elan_i2c_read_cmd(client, ETP_I2C_IAP_CHECKSUM_CMD, val);
+ if (retval < 0) {
+ dev_err(&client->dev, "Read checksum fail, %d\n", retval);
+ return -1;
+ }
+ checksum = le16_to_cpup((__le16 *)val);
+ return checksum;
+}
+
+static bool elan_iap_reset(struct elan_tp_data *data)
+{
+ int retval = 0;
+ struct i2c_client *client = data->client;
+
+ retval = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
+ ETP_IAP_RESET);
+ if (retval < 0) {
+ dev_err(&client->dev, "cannot reset IC, %d\n", retval);
+ return false;
+ }
+ return true;
+}
+
+static bool elan_iap_setflashkey(struct elan_tp_data *data, int mode)
+{
+ int retval = 0;
+ struct i2c_client *client = data->client;
+
+ retval = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
+ ETP_ENABLE_FWUPDATE);
+ if (retval < 0) {
+ dev_err(&client->dev, "cannot set flash key, %d\n", retval);
+ return false;
+ }
+
+ /* Wait for F/W IAP initialization */
+ if (mode == MAIN_MODE)
+ msleep(100);
+ else
+ msleep(30);
+
+ return true;
+}
+
+static bool elan_iap_page_write_ok(struct elan_tp_data *data)
+{
+ u16 constant;
+ int retval = 0;
+ struct i2c_client *client = data->client;
+
+ retval = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
+ if (retval < 0)
+ return false;
+
+ constant = le16_to_cpup((__le16 *)val);
+
+ if (constant & ETP_FW_IAP_PAGE_ERR)
+ return false;
+
+ if (constant & ETP_FW_IAP_INTERFACE_ERR)
+ return false;
+
+ return true;
+}
+
+static int elan_check_fw(struct elan_tp_data *data,
+ const struct firmware *fw)
+{
+ u16 uniqueid_addr, uniqueid;
+ struct device *dev = &data->client->dev;
+
+ /* Firmware must match exact PAGE_NUM * PAGE_SIZE bytes */
+ if (fw->size != ETP_FW_SIZE) {
+ dev_err(dev, "invalid firmware size = %zu, expected %d.\n",
+ fw->size, ETP_FW_SIZE);
+ return -EBADF;
+ }
+
+ /* Check IAP Version */
+ if (!memcmp(&fw->data[ETP_IAP_VERSION_ADDR * 2],
+ &data->iap_version, 2)) {
+ dev_err(dev, "IAP F/W updating version does not match.");
+ return -EEXIST;
+ }
+
+ /* Get IAP Start Address*/
+ memcpy(&data->iap_start_addr, &fw->data[ETP_IAP_START_ADDR * 2], 2);
+ /* Get Unique ID Address */
+ memcpy(&uniqueid_addr, &fw->data[data->iap_start_addr * 2], 2);
+ /* Get Unique ID */
+ memcpy(&uniqueid, &fw->data[uniqueid_addr * 2], 2);
+
+ return 0;
+}
+
+static int elan_prepare_fw_update(struct elan_tp_data *data)
+{
+ struct i2c_client *client = data->client;
+ struct device *dev = &data->client->dev;
+
+ /* Get FW in which mode (IAP_MODE/MAIN_MODE) */
+ int mode = elan_iap_getmode(data);
+
+ if (mode == IAP_MODE) {
+ /* Reset IC */
+ if (elan_iap_reset(data) == false)
+ return -1;
+ msleep(30);
+ }
+
+ /* set flash key*/
+ if (elan_iap_setflashkey(data, mode) == false) {
+ dev_err(dev, "cannot set flash key\n");
+ return -1;
+ }
+
+ /* check is in iap mode or not*/
+ if (elan_iap_getmode(data) == MAIN_MODE) {
+ dev_err(dev, "status wrong.\n");
+ return -1;
+ }
+
+ /* set flash key again */
+ if (elan_iap_setflashkey(data, mode) == false) {
+ dev_err(dev, "cannot set flash key\n");
+ return -1;
+ }
+
+ /* read back to check we actually enabled successfully. */
+ if (elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val) < 0) {
+ dev_err(dev, "cannot get iap register\n");
+ return -1;
+ }
+
+ if (le16_to_cpup((__le16 *)val) != ETP_ENABLE_FWUPDATE) {
+ dev_err(dev, "wrong iap password = 0x%X\n",
+ le16_to_cpup((__le16 *)val));
+ return -1;
+ }
+ return 0;
+}
+
+static int elan_write_fw_block(struct elan_tp_data *data,
+ const u8 *page, u16 checksum)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+ int repeat = 3;
+ u8 page_store[ETP_FW_PAGE_SIZE + 4];
+
+ page_store[0] = ETP_FW_IAP_REG_L;
+ page_store[1] = ETP_FW_IAP_REG_H;
+ memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE);
+
+ /* recode checksum at last two bytes */
+ page_store[ETP_FW_PAGE_SIZE+2] = (u8)(checksum & 0xFF);
+ page_store[ETP_FW_PAGE_SIZE+3] = (u8)((checksum >> 8)&0xFF);
+
+ do {
+ ret = i2c_master_send(data->client, page_store,
+ ETP_FW_PAGE_SIZE + 4);
+
+ /* Wait for F/W to update one page ROM data. */
+ msleep(20);
+
+ if (ret == (ETP_FW_PAGE_SIZE + 4)) {
+ if (elan_iap_page_write_ok(data))
+ break;
+ }
+ dev_dbg(dev, "IAP retry this page!\n");
+ repeat--;
+ } while (repeat == 0);
+
+ if (repeat > 0)
+ return 0;
+ return -1;
+}
+
+static int elan_firmware(struct elan_tp_data *data)
+{
+ struct device *dev = &data->client->dev;
+ const struct firmware *fw;
+ const char *fw_name = ETP_FW_NAME;
+ int i, j, ret;
+ u16 boot_page_count;
+ u16 sw_checksum, fw_checksum;
+
+ ret = request_firmware(&fw, ETP_FW_NAME, dev);
+ if (ret) {
+ dev_err(dev, "cannot load firmware from %s, %d\n",
+ fw_name, ret);
+ goto done;
+ }
+ ret = elan_check_fw(data, fw);
+ if (ret) {
+ dev_err(dev, "Invalid Elan firmware from %s, %d\n",
+ fw_name, ret);
+ goto done;
+ }
+
+ /* set flash key and into IAP mode */
+ ret = elan_prepare_fw_update(data);
+ if (ret)
+ goto done;
+
+ sw_checksum = 0;
+ fw_checksum = 0;
+ boot_page_count = (data->iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
+ for (i = boot_page_count; i < ETP_FW_PAGE_COUNT; i++) {
+ u16 checksum = 0;
+ const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
+
+ for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
+ checksum += ((page[j + 1] << 8) | page[j]);
+
+ ret = elan_write_fw_block(data, page, checksum);
+ if (ret)
+ goto done;
+ sw_checksum += checksum;
+ }
+ /* Wait WDT rest and power on reset*/
+ msleep(600);
+
+ /* check checksum */
+ fw_checksum = elan_iap_checksum(data);
+ if (sw_checksum != fw_checksum) {
+ dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
+ sw_checksum, fw_checksum);
+ ret = -1;
+ goto done;
+ }
+ ret = 0;
+done:
+ if (ret != 0)
+ elan_iap_reset(data);
+ release_firmware(fw);
+ return ret;
+}
+
+/**************************************************************************
+* Genernal 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;
+ elan_i2c_read_block(data->client, ETP_I2C_IAP_VERSION_CMD, val, 3);
+ ret = le16_to_cpup((__le16 *)val);
+ return ret;
+}
+
+static int elan_get_x_max(struct elan_tp_data *data)
+{
+ int ret;
+ 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;
+ 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;
+ 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;
+ 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;
+ elan_i2c_read_cmd(data->client, ETP_I2C_FW_VERSION_CMD, val);
+ ret = le16_to_cpup((__le16 *)val);
+ return ret;
+}
+
+static int elan_get_sm_version(struct elan_tp_data *data)
+{
+ int ret;
+ 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;
+ elan_i2c_read_cmd(data->client, ETP_I2C_UNIQUEID_CMD, val);
+ ret = le16_to_cpup((__le16 *)val);
+ return ret;
+}
+
+static int elan_get_x_resolution(struct elan_tp_data *data)
+{
+ int ret;
+ 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;
+ elan_i2c_read_cmd(data->client, ETP_I2C_RESOLUTION_CMD, val);
+ ret = elan_convert_res(val[1]);
+ return ret;
+}
+
+static int elan_get_fw_checksum(struct elan_tp_data *data)
+{
+ int ret;
+ elan_i2c_read_cmd(data->client, ETP_I2C_FW_CHECKSUM_CMD, val);
+ ret = le16_to_cpup((__le16 *)val);
+ return ret;
+}
+
+static int elan_get_max_baseline(struct elan_tp_data *data)
+{
+ int ret;
+ elan_i2c_read_cmd(data->client, ETP_I2C_MAX_BASELINE_CMD, val);
+ ret = le16_to_cpup((__le16 *)val);
+ return ret;
+}
+
+static int elan_get_min_baseline(struct elan_tp_data *data)
+{
+ int ret;
+ elan_i2c_read_cmd(data->client, ETP_I2C_MIN_BASELINE_CMD, val);
+ ret = le16_to_cpup((__le16 *)val);
+ return ret;
+}
+
+
+static int elan_enable_calibrate(struct elan_tp_data *data)
+{
+ int ret;
+ ret = elan_i2c_enable_calibrate(data->client);
+ return ret;
+}
+
+static int elan_disable_calibrate(struct elan_tp_data *data)
+{
+ int ret;
+ ret = elan_i2c_disable_calibrate(data->client);
+ return ret;
+}
+
+/********************************************************************
+ * below routines export interfaces to sysfs file system.
+ * so user can get firmware/driver/hardware information using cat command.
+ * e.g.: use below command to get firmware version
+ * cat /sys/bus/i2c/drivers/elan_i2c/1-0015/firmware_version
+ *******************************************************************
+ */
+static ssize_t elan_enable_detailinfo(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ data->enable_detail_info = true;
+ return sprintf(buf, "enable\n");
+}
+
+static ssize_t elan_read_fw_checksum(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned int checksum = 0;
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ if (data->enable_detail_info == true) {
+ checksum = elan_get_fw_checksum(data);
+ data->enable_detail_info = false;
+ }
+ return sprintf(buf, "0x%04x\n", checksum);
+}
+
+static ssize_t elan_read_unique_id(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ data->unique_id = elan_get_unique_id(data);
+ return sprintf(buf, "0x%04x\n", data->unique_id);
+}
+
+static ssize_t elan_read_driver_ver(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", ELAN_DRIVER_VERSION);
+}
+
+static ssize_t elan_read_fw_ver(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ data->fw_version = elan_get_fw_version(data);
+ return sprintf(buf, "0x%04x\n", data->fw_version);
+}
+
+static ssize_t elan_read_sm_ver(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ data->sm_version = elan_get_sm_version(data);
+ return sprintf(buf, "0x%04x\n", data->sm_version);
+}
+
+static ssize_t elan_read_iap_ver(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ data->iap_version = elan_get_iap_version(data);
+ return sprintf(buf, "0x%04x\n", data->iap_version);
+}
+
+
+static ssize_t elan_update_fw(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ int ret;
+ data->updated_fw = true;
+ ret = elan_firmware(data);
+ if (ret)
+ dev_err(dev, "firmware update failed.\n");
+ else
+ dev_info(dev, "firmware update succeeded.\n");
+ return ret ? ret : count;
+}
+
+static ssize_t elan_do_calibrate(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ int tries = 20;
+ int ret = 0;
+ val[0] = 0;
+
+ disable_irq(data->irq);
+ elan_enable_calibrate(data);
+ elan_i2c_write_cmd(data->client, ETP_I2C_CALIBRATE_CMD, 1);
+
+ do {
+ /* wait 250ms and check finish or not */
+ msleep(250);
+ elan_i2c_read_block(data->client,
+ ETP_I2C_CALIBRATE_CMD, val, 1);
+
+ /* calibrate finish */
+ if (val[0] == 0)
+ break;
+ } while (--tries);
+
+ elan_disable_calibrate(data);
+ enable_irq(data->irq);
+
+ if (tries == 0) {
+ dev_err(dev, "Failed to calibrate. Timeout.\n");
+ ret = -ETIMEDOUT;
+ }
+ return ret < 0 ? ret : count;
+}
+
+
+static ssize_t elan_read_baseline(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ int max_baseline, min_baseline;
+
+ disable_irq(data->irq);
+ elan_enable_calibrate(data);
+ msleep(250);
+ max_baseline = elan_get_max_baseline(data);
+ min_baseline = elan_get_min_baseline(data);
+ elan_disable_calibrate(data);
+ enable_irq(data->irq);
+ return sprintf(buf, "max:%d min:%d\n", max_baseline, min_baseline);
+}
+
+static ssize_t elan_do_reinitialize(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ int ret;
+ disable_irq(data->irq);
+ ret = elan_i2c_reinitialize(data->client);
+ enable_irq(data->irq);
+ if (ret < 0)
+ return sprintf(buf, "reinitialize fail\n");
+
+ return sprintf(buf, "reinitialize success\n");
+}
+
+static DEVICE_ATTR(unique_id, S_IRUGO, elan_read_unique_id, NULL);
+static DEVICE_ATTR(firmware_version, S_IRUGO, elan_read_fw_ver, NULL);
+static DEVICE_ATTR(sample_version, S_IRUGO, elan_read_sm_ver, NULL);
+static DEVICE_ATTR(driver_version, S_IRUGO, elan_read_driver_ver, NULL);
+static DEVICE_ATTR(iap_version, S_IRUGO, elan_read_iap_ver, NULL);
+static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_read_fw_checksum, NULL);
+static DEVICE_ATTR(open_info, S_IRUGO, elan_enable_detailinfo, NULL);
+static DEVICE_ATTR(baseline, S_IRUGO, elan_read_baseline, NULL);
+static DEVICE_ATTR(reinitialize, S_IRUGO, elan_do_reinitialize, NULL);
+static DEVICE_ATTR(calibrate, S_IWUSR, NULL, elan_do_calibrate);
+static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_update_fw);
+
+static struct attribute *elan_sysfs_entries[] = {
+ &dev_attr_unique_id.attr,
+ &dev_attr_firmware_version.attr,
+ &dev_attr_sample_version.attr,
+ &dev_attr_driver_version.attr,
+ &dev_attr_iap_version.attr,
+ &dev_attr_fw_checksum.attr,
+ &dev_attr_open_info.attr,
+ &dev_attr_baseline.attr,
+ &dev_attr_reinitialize.attr,
+ &dev_attr_calibrate.attr,
+ &dev_attr_update_fw.attr,
+ NULL,
+};
+
+static const struct attribute_group elan_sysfs_group = {
+ .attrs = elan_sysfs_entries,
+};
+
+/*****************************************************************
+* 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_enable_calibrate(struct i2c_client *client)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD,
+ ETP_ENABLE_ABS|ETP_ENABLE_CALIBRATE);
+}
+
+static int elan_i2c_disable_calibrate(struct i2c_client *client)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD,
+ ETP_ENABLE_ABS|ETP_DISABLE_CALIBRATE);
+}
+
+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;
+
+ 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;
+}
+
+static int elan_i2c_reinitialize(struct i2c_client *client)
+{
+ int ret;
+
+ ret = elan_i2c_initialize(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "device initialize failed.\n");
+ goto err_i2c_reinitialize;
+ }
+
+ ret = elan_i2c_enable_absolute_mode(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "cannot switch to absolute mode.\n");
+ goto err_i2c_reinitialize;
+ }
+
+ ret = elan_i2c_wake_up(client);
+ if (ret < 0)
+ dev_err(&client->dev, "device wake up failed.\n");
+err_i2c_reinitialize:
+ return ret;
+}
+
+/*****************************************************************
+* Elan isr functions
+******************************************************************
+*/
+
+static int elan_check_packet(struct elan_tp_data *data, u8 *packet)
+{
+ u8 rid;
+ 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;
+
+ 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;
+
+ retval = mutex_lock_interruptible(&data->dbfs_mutex);
+ if (retval)
+ return IRQ_HANDLED;
+
+ if (data->updated_fw) {
+ retval = i2c_master_recv(data->client, raw,
+ ETP_INF_LENGTH);
+ if (retval == 2 && !le16_to_cpup((__le16 *)raw)) {
+ dev_info(&data->client->dev,
+ "reinitializing after F/W update...");
+ elan_i2c_reinitialize(data->client);
+ }
+ data->updated_fw = false;
+ goto elan_isr_end;
+ }
+
+ 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);
+ data->dbfs_buffer.bfetch = false;
+ memcpy(data->dbfs_buffer.buffer, raw, report_len);
+
+elan_isr_end:
+ mutex_unlock(&data->dbfs_mutex);
+ return IRQ_HANDLED;
+}
+
+
+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;
+
+ 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(INPUT_PROP_POINTER, input->propbit);
+ __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(EV_ABS, input->evbit);
+
+ __set_bit(BTN_LEFT, input->keybit);
+ __set_bit(BTN_TOUCH, input->keybit);
+ __set_bit(BTN_TOOL_FINGER, input->keybit);
+ __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
+ __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
+ __set_bit(BTN_TOOL_QUADTAP, input->keybit);
+ __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
+
+ __set_bit(ABS_MT_TOUCH_MAJOR, input->absbit);
+ __set_bit(ABS_MT_TOUCH_MINOR, input->absbit);
+ __set_bit(ABS_MT_POSITION_X, input->absbit);
+ __set_bit(ABS_MT_POSITION_Y, input->absbit);
+
+ 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);
+
+ dev_info(&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,
+ (char)x_res, (char)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(data->width_x, data->width_y), 0, 0);
+ input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
+ ETP_FINGER_WIDTH * min(data->width_x, data->width_y), 0, 0);
+
+ /* Register the device in input subsystem */
+ ret = input_register_device(input);
+ if (ret) {
+ dev_err(&client->dev, "input device 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;
+ 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;
+ 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 adapter\n");
+ return -EIO;
+ }
+
+ data = kzalloc(sizeof(struct elan_tp_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = client;
+ data->updated_fw = false;
+ data->enable_detail_info = false;
+ data->adapter_func = adapter_func;
+ data->irq = client->irq;
+
+ ret = elan_i2c_initialize(client);
+ if (ret < 0)
+ goto err_init;
+
+ ret = elan_input_dev_create(data);
+ if (ret < 0)
+ goto err_input_dev;
+
+ if (elan_dbfs_init(data)) {
+ dev_err(&client->dev, "error create elan debugfs.\n");
+ goto err_input_dev;
+ }
+ 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;
+ }
+
+ ret = elan_i2c_enable_absolute_mode(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "cannot switch to abs mode.\n");
+ goto err_switch_mode;
+ }
+
+ ret = elan_i2c_wake_up(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "device wake up failed.\n");
+ goto err_switch_mode;
+ }
+
+ device_init_wakeup(&client->dev, 1);
+ ret = sysfs_create_group(&client->dev.kobj, &elan_sysfs_group);
+ if (ret < 0) {
+ dev_err(&client->dev, "cannot register dev attribute %d", ret);
+ goto err_switch_mode;
+ }
+ i2c_set_clientdata(client, data);
+ return 0;
+
+err_switch_mode:
+ free_irq(data->irq, data);
+err_irq:
+ input_free_device(data->input);
+ debugfs_remove_recursive(data->dbfs_root);
+ mutex_destroy(&data->dbfs_mutex);
+err_input_dev:
+ kfree(data);
+err_init:
+ 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);
+ debugfs_remove_recursive(data->dbfs_root);
+ mutex_destroy(&data->dbfs_mutex);
+
+ input_unregister_device(data->input);
+ kfree(data);
+ sysfs_remove_group(&client->dev.kobj, &elan_sysfs_group);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int elan_suspend(struct device *dev)
+{
+ int ret;
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ disable_irq(data->irq);
+ ret = elan_i2c_sleep(data->client);
+
+ if (ret < 0) {
+ dev_err(dev, "suspend mode failed, %d\n", ret);
+ } else {
+ if (device_may_wakeup(dev))
+ data->irq_wake = (enable_irq_wake(data->irq) == 0);
+ }
+ return 0;
+}
+
+static int elan_resume(struct device *dev)
+{
+ int ret = 0;
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev) && data->irq_wake)
+ disable_irq_wake(data->irq);
+
+ ret = elan_i2c_reinitialize(data->client);
+
+ if (ret < 0)
+ dev_err(dev, "resume active power failed, %d\n", ret);
+
+ enable_irq(data->irq);
+ return 0;
+}
+#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,
+};
+
+
+static int __init elan_init(void)
+{
+ int ret;
+ ret = i2c_add_driver(&elan_driver);
+ if (ret) {
+ pr_err("elan driver register FAILED.\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static void __exit elan_exit(void)
+{
+ i2c_del_driver(&elan_driver);
+}
+
+module_init(elan_init);
+module_exit(elan_exit);
+
+MODULE_AUTHOR("Duson Lin <dusonlin@....com.tw>");
+MODULE_DESCRIPTION("Elan I2C Touchpad driver");
+MODULE_LICENSE("GPL");
--
1.7.10.4
--
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