Re: [PATCH v2] Input: add i2c/smbus driver for elan touchpad
From: Dmitry Torokhov
Date: Fri Oct 03 2014 - 17:04:10 EST
Hi Duson,
On Tue, Jan 07, 2014 at 11:08:03AM +0800, Duson Lin wrote:
> This driver adds support for elan i2c/smbus touchpad found on some
> laptops PC
>
I was looking at your original patch together with varous other patchs
for the device in ChromeOS trees and I ended up with the following
version. Please take a look and shout if you see something wrong.
The SMbus portion is untested as I do not have hardware; I2C does work
on actual hardware.
Thanks.
--
Dmitry
Input: driver for Elan I2C/SMbus touchpad
From: Duson Lin <dusonlin@xxxxxxxxxx>
This driver supports Elan I2C/SMbous touchpads found in some laptops and
also in many Chromebooks.
Signed-off-by: Duson Lin <dusonlin@xxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
.../devicetree/bindings/input/elan_i2c.txt | 34 +
.../devicetree/bindings/vendor-prefixes.txt | 1
drivers/input/mouse/Kconfig | 30 +
drivers/input/mouse/Makefile | 5
drivers/input/mouse/elan_i2c.h | 86 ++
drivers/input/mouse/elan_i2c_core.c | 1129 ++++++++++++++++++++
drivers/input/mouse/elan_i2c_i2c.c | 612 +++++++++++
drivers/input/mouse/elan_i2c_smbus.c | 514 +++++++++
8 files changed, 2411 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/elan_i2c.txt
create mode 100644 drivers/input/mouse/elan_i2c.h
create mode 100644 drivers/input/mouse/elan_i2c_core.c
create mode 100644 drivers/input/mouse/elan_i2c_i2c.c
create mode 100644 drivers/input/mouse/elan_i2c_smbus.c
diff --git a/Documentation/devicetree/bindings/input/elan_i2c.txt b/Documentation/devicetree/bindings/input/elan_i2c.txt
new file mode 100644
index 0000000..0a6ee7d
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/elan_i2c.txt
@@ -0,0 +1,34 @@
+Elantech I2C Touchpad
+
+Required properties:
+- compatible: must be "elan,i2c_touchpad".
+- reg: I2C address of the chip.
+- interrupt-parent: a phandle for the gpio controller (see interrupt
+ binding[0]).
+- interrupts: (gpio) interrupt to which the chip is connected (see interrupt
+ binding[0]).
+
+Optional properties:
+- wakeup-source: touchpad should be configured as a wakeup source.
+- pinctrl-names: should be "default" (see pinctrl binding [1]).
+- pinctrl-0: a phandle pointing to the pin settings for the device (see
+ pinctrl binding [1]).
+- vcc-supply: a phandle for the regulator supplying 3.3V power.
+
+[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+Example:
+ &i2c1 {
+ /* ... */
+
+ touchpad@15 {
+ compatible = "elan,i2c_touchpad";
+ reg = <0x15>;
+ interrupt-parent = <&gpio4>;
+ interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
+ wakeup-source;
+ };
+
+ /* ... */
+ };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index ac7269f..e6469ec 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -42,6 +42,7 @@ dlink D-Link Corporation
dmo Data Modul AG
ebv EBV Elektronik
edt Emerging Display Technologies
+elan Elan Microelectronic Corp.
emmicro EM Microelectronic
epcos EPCOS AG
epfl Ecole Polytechnique FÃdÃrale de Lausanne
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 366fc7a..d8b46b0 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -215,6 +215,36 @@ 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/SMbus Trackpads.
+
+ Say Y here if you have a ELAN I2C/SMbus Touchpad.
+
+ To compile this driver as a module, choose M here: the module will be
+ called elan_i2c.
+
+config MOUSE_ELAN_I2C_I2C
+ bool "Enable I2C support"
+ depends on MOUSE_ELAN_I2C
+ default y
+ help
+ Say Y here if Elan Touchpad in your system is connected to
+ a standard I2C controller.
+
+ If unsure, say Y.
+
+config MOUSE_ELAN_I2C_SMBUS
+ bool "Enable SMbus support"
+ depends on MOUSE_ELAN_I2C
+ help
+ Say Y here if Elan Touchpad in your system is connected to
+ a SMbus adapter.
+
+ If unsure, say Y.
+
config MOUSE_INPORT
tristate "InPort/MS/ATIXL busmouse"
depends on ISA
diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index dda507f..560003d 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
@@ -34,3 +35,7 @@ psmouse-$(CONFIG_MOUSE_PS2_SENTELIC) += sentelic.o
psmouse-$(CONFIG_MOUSE_PS2_TRACKPOINT) += trackpoint.o
psmouse-$(CONFIG_MOUSE_PS2_TOUCHKIT) += touchkit_ps2.o
psmouse-$(CONFIG_MOUSE_PS2_CYPRESS) += cypress_ps2.o
+
+elan_i2c-objs := elan_i2c_core.o
+elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_I2C) += elan_i2c_i2c.o
+elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_SMBUS) += elan_i2c_smbus.o
diff --git a/drivers/input/mouse/elan_i2c.h b/drivers/input/mouse/elan_i2c.h
new file mode 100644
index 0000000..2e83862
--- /dev/null
+++ b/drivers/input/mouse/elan_i2c.h
@@ -0,0 +1,86 @@
+/*
+ * Elan I2C/SMBus Touchpad driver
+ *
+ * Copyright (c) 2013 ELAN Microelectronics Corp.
+ *
+ * Author: ææç (Duson Lin) <dusonlin@xxxxxxxxxx>
+ * Version: 1.5.5
+ *
+ * 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.
+ */
+
+#ifndef _ELAN_I2C_H
+#define _ELAN_i2C_H
+
+#include <linux/types.h>
+
+#define ETP_ENABLE_ABS 0x0001
+#define ETP_ENABLE_CALIBRATE 0x0002
+#define ETP_DISABLE_CALIBRATE 0x0000
+#define ETP_DISABLE_POWER 0x0001
+
+/* IAP Firmware handling */
+#define ETP_FW_NAME "elan_i2c.bin"
+#define ETP_IAP_START_ADDR 0x0083
+#define ETP_FW_IAP_PAGE_ERR (1 << 5)
+#define ETP_FW_IAP_INTF_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)
+
+struct i2c_client;
+struct completion;
+
+enum tp_mode {
+ IAP_MODE = 1,
+ MAIN_MODE
+};
+
+struct elan_transport_ops {
+ int (*initialize)(struct i2c_client *client);
+ int (*sleep_control)(struct i2c_client *, bool sleep);
+ int (*power_control)(struct i2c_client *, bool enable);
+ int (*set_mode)(struct i2c_client *client, u8 mode);
+
+ int (*calibrate)(struct i2c_client *client);
+ int (*calibrate_result)(struct i2c_client *client, u8 *val);
+
+ int (*get_baseline_data)(struct i2c_client *client,
+ bool max_baseliune, u8 *value);
+
+ int (*get_version)(struct i2c_client *client, bool iap, u8 *version);
+ int (*get_sm_version)(struct i2c_client *client, u8 *version);
+ int (*get_checksum)(struct i2c_client *client, bool iap, u16 *csum);
+ int (*get_product_id)(struct i2c_client *client, u8 *id);
+
+ int (*get_max)(struct i2c_client *client,
+ unsigned int *max_x, unsigned int *max_y);
+ int (*get_resolution)(struct i2c_client *client,
+ u8 *hw_res_x, u8 *hw_res_y);
+ int (*get_num_traces)(struct i2c_client *client,
+ unsigned int *x_tracenum,
+ unsigned int *y_tracenum);
+
+ int (*iap_get_mode)(struct i2c_client *client, enum tp_mode *mode);
+ int (*iap_reset)(struct i2c_client *client);
+
+ int (*prepare_fw_update)(struct i2c_client *client);
+ int (*write_fw_block)(struct i2c_client *client,
+ const u8 *page, u16 checksum, int idx);
+ int (*finish_fw_update)(struct i2c_client *client,
+ struct completion *reset_done);
+
+ int (*get_report)(struct i2c_client *client, u8 *report);
+};
+
+extern const struct elan_transport_ops elan_smbus_ops, elan_i2c_ops;
+
+#endif /* _ELAN_I2C_H */
diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
new file mode 100644
index 0000000..f1e5e30
--- /dev/null
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -0,0 +1,1129 @@
+/*
+ * Elan I2C/SMBus Touchpad driver
+ *
+ * Copyright (c) 2013 ELAN Microelectronics Corp.
+ *
+ * Author: ææç (Duson Lin) <dusonlin@xxxxxxxxxx>
+ * Version: 1.5.5
+ *
+ * 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/acpi.h>
+#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/kernel.h>
+#include <linux/sched.h>
+#include <linux/input.h>
+#include <linux/uaccess.h>
+#include <linux/jiffies.h>
+#include <linux/completion.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+#include <asm/unaligned.h>
+
+#include "elan_i2c.h"
+
+#define DRIVER_NAME "elan_i2c"
+#define ELAN_DRIVER_VERSION "1.5.5"
+#define ETP_PRESSURE_OFFSET 25
+#define ETP_MAX_PRESSURE 255
+#define ETP_FWIDTH_REDUCE 90
+#define ETP_FINGER_WIDTH 15
+#define ETP_RETRY_COUNT 3
+
+#define ETP_MAX_FINGERS 5
+#define ETP_FINGER_DATA_LEN 5
+#define ETP_REPORT_ID 0x5D
+#define ETP_REPORT_ID_OFFSET 2
+#define ETP_TOUCH_INFO_OFFSET 3
+#define ETP_FINGER_DATA_OFFSET 4
+#define ETP_MAX_REPORT_LEN 34
+
+/* The main device structure */
+struct elan_tp_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct regulator *vcc;
+
+ const struct elan_transport_ops *ops;
+
+ /* for fw update */
+ struct completion fw_completion;
+ bool in_fw_update;
+
+ struct mutex sysfs_mutex;
+
+ unsigned int max_x;
+ unsigned int max_y;
+ unsigned int width_x;
+ unsigned int width_y;
+ unsigned int x_res;
+ unsigned int y_res;
+
+ u8 product_id;
+ u8 fw_version;
+ u8 sm_version;
+ u8 iap_version;
+ u16 fw_checksum;
+
+ u8 mode;
+
+ bool irq_wake;
+
+ u8 min_baseline;
+ u8 max_baseline;
+ bool baseline_ready;
+};
+
+static int elan_enable_power(struct elan_tp_data *data)
+{
+ int repeat = ETP_RETRY_COUNT;
+ int error;
+
+ error = regulator_enable(data->vcc);
+ if (error) {
+ dev_err(&data->client->dev,
+ "Failed to enable regulator: %d\n", error);
+ return error;
+ }
+
+ do {
+ error = data->ops->power_control(data->client, true);
+ if (error >= 0)
+ return 0;
+
+ msleep(30);
+ } while (--repeat > 0);
+
+ return error;
+}
+
+static int elan_disable_power(struct elan_tp_data *data)
+{
+ int repeat = ETP_RETRY_COUNT;
+ int error;
+
+ do {
+ error = data->ops->power_control(data->client, false);
+ if (!error) {
+ error = regulator_disable(data->vcc);
+ if (error) {
+ dev_err(&data->client->dev,
+ "Failed to disable regulator: %d\n",
+ error);
+ /* Attempt to power the chip back up */
+ data->ops->power_control(data->client, true);
+ break;
+ }
+
+ return 0;
+ }
+
+ msleep(30);
+ } while (--repeat > 0);
+
+ return error;
+}
+
+static int elan_sleep(struct elan_tp_data *data)
+{
+ int repeat = ETP_RETRY_COUNT;
+ int error;
+
+ do {
+ error = data->ops->sleep_control(data->client, true);
+ if (!error)
+ return 0;
+
+ msleep(30);
+ } while (--repeat > 0);
+
+ return error;
+}
+
+static int __elan_initialize(struct elan_tp_data *data)
+{
+ struct i2c_client *client = data->client;
+ int error;
+
+ error = data->ops->initialize(client);
+ if (error) {
+ dev_err(&client->dev, "device initialize failed: %d\n", error);
+ return error;
+ }
+
+ data->mode |= ETP_ENABLE_ABS;
+ error = data->ops->set_mode(client, data->mode);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to switch to absolute mode: %d\n", error);
+ return error;
+ }
+
+ error = data->ops->sleep_control(client, false);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to wake device up: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_initialize(struct elan_tp_data *data)
+{
+ int repeat = ETP_RETRY_COUNT;
+ int error;
+
+ do {
+ error = __elan_initialize(data);
+ if (!error)
+ return 0;
+
+ repeat--;
+ msleep(30);
+ } while (--repeat > 0);
+
+ return error;
+}
+
+static int elan_query_device_info(struct elan_tp_data *data)
+{
+ int error;
+
+ error = data->ops->get_product_id(data->client, &data->product_id);
+ if (error)
+ return error;
+
+ error = data->ops->get_version(data->client, false, &data->fw_version);
+ if (error)
+ return error;
+
+ error = data->ops->get_checksum(data->client, false,
+ &data->fw_checksum);
+ if (error)
+ return error;
+
+ error = data->ops->get_sm_version(data->client, &data->sm_version);
+ if (error)
+ return error;
+
+ error = data->ops->get_version(data->client, true, &data->iap_version);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static unsigned int elan_convert_resolution(u8 val)
+{
+ /*
+ * (value from firmware) * 10 + 790 = dpi
+ *
+ * We also have to convert dpi to dots/mm (*10/254 to avoid floating
+ * point).
+ */
+
+ return ((int)(char)val * 10 + 790) * 10 / 254;
+}
+
+static int elan_query_device_parameters(struct elan_tp_data *data)
+{
+ unsigned int x_traces, y_traces;
+ u8 hw_x_res, hw_y_res;
+ int error;
+
+ error = data->ops->get_max(data->client, &data->max_x, &data->max_y);
+ if (error)
+ return error;
+
+ error = data->ops->get_num_traces(data->client, &x_traces, &y_traces);
+ if (error)
+ return error;
+
+ data->width_x = data->max_x / x_traces;
+ data->width_y = data->max_y / y_traces;
+
+ error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res);
+ if (error)
+ return error;
+
+ data->x_res = elan_convert_resolution(hw_x_res);
+ data->y_res = elan_convert_resolution(hw_y_res);
+
+ return 0;
+}
+
+/*
+ **********************************************************
+ * IAP firmware updater related routines
+ **********************************************************
+ */
+static int elan_write_fw_block(struct elan_tp_data *data,
+ const u8 *page, u16 checksum, int idx)
+{
+ int retry = ETP_RETRY_COUNT;
+ int error;
+
+ do {
+ error = data->ops->write_fw_block(data->client,
+ page, checksum, idx);
+ if (!error)
+ return 0;
+
+ dev_dbg(&data->client->dev,
+ "IAP retrying page %d (error: %d)\n", idx, error);
+ } while (--retry > 0);
+
+ return error;
+}
+
+static int __elan_update_firmware(struct elan_tp_data *data,
+ const struct firmware *fw)
+{
+ struct i2c_client *client = data->client;
+ struct device *dev = &client->dev;
+ int i, j;
+ int error;
+ u16 iap_start_addr;
+ u16 boot_page_count;
+ u16 sw_checksum = 0, fw_checksum = 0;
+
+ error = data->ops->prepare_fw_update(client);
+ if (error)
+ return error;
+
+ iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
+
+ boot_page_count = (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]);
+
+ error = elan_write_fw_block(data, page, checksum, i);
+ if (error) {
+ dev_err(dev, "write page %d fail: %d\n", i, error);
+ return error;
+ }
+
+ sw_checksum += checksum;
+ }
+
+ /* Wait WDT reset and power on reset */
+ msleep(600);
+
+ error = data->ops->finish_fw_update(client, &data->fw_completion);
+ if (error)
+ return error;
+
+ error = data->ops->get_checksum(client, true, &fw_checksum);
+ if (error)
+ return error;
+
+ if (sw_checksum != fw_checksum) {
+ dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
+ sw_checksum, fw_checksum);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int elan_update_firmware(struct elan_tp_data *data,
+ const struct firmware *fw)
+{
+ struct i2c_client *client = data->client;
+ int retval;
+
+ dev_dbg(&client->dev, "Starting firmware update....\n");
+
+ disable_irq(client->irq);
+ data->in_fw_update = true;
+
+ retval = __elan_update_firmware(data, fw);
+ if (retval) {
+ dev_err(&client->dev, "firmware update failed: %d\n", retval);
+ data->ops->iap_reset(client);
+ } else {
+ /* Reinitialize TP after fw is updated */
+ elan_initialize(data);
+ elan_query_device_info(data);
+ }
+
+ data->in_fw_update = false;
+ enable_irq(client->irq);
+
+ return retval;
+}
+
+
+/*
+ *******************************************************************
+ * SYSFS attributes
+ *******************************************************************
+ */
+static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "0x%04x\n", data->fw_checksum);
+}
+
+static ssize_t elan_sysfs_read_product_id(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d.0\n", data->product_id);
+}
+
+static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d.0\n", data->fw_version);
+}
+
+static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d.0\n", data->sm_version);
+}
+
+static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d.0\n", data->iap_version);
+}
+
+static ssize_t elan_sysfs_update_fw(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ const struct firmware *fw;
+ int error;
+
+ error = request_firmware(&fw, ETP_FW_NAME, dev);
+ if (error) {
+ dev_err(dev, "cannot load firmware %s: %d\n",
+ ETP_FW_NAME, error);
+ return error;
+ }
+
+ /* Firmware must be exactly 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);
+ error = -EBADF;
+ goto out_release_fw;
+ }
+
+ error = mutex_lock_interruptible(&data->sysfs_mutex);
+ if (error)
+ goto out_release_fw;
+
+ error = elan_update_firmware(data, fw);
+
+ mutex_unlock(&data->sysfs_mutex);
+
+out_release_fw:
+ release_firmware(fw);
+ return error ?: count;
+}
+
+static ssize_t calibrate_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct elan_tp_data *data = i2c_get_clientdata(client);
+ int tries = 20;
+ int retval;
+ int error;
+ u8 val[3];
+
+ retval = mutex_lock_interruptible(&data->sysfs_mutex);
+ if (retval)
+ return retval;
+
+ disable_irq(client->irq);
+
+ data->mode |= ETP_ENABLE_CALIBRATE;
+ retval = data->ops->set_mode(client, data->mode);
+ if (retval) {
+ dev_err(dev, "failed to enable calibration mode: %d\n",
+ retval);
+ goto out;
+ }
+
+ retval = data->ops->calibrate(client);
+ if (retval) {
+ dev_err(dev, "failed to start calibration: %d\n",
+ retval);
+ goto out_disable_calibrate;
+ }
+
+ val[0] = 0xff;
+ do {
+ /* Wait 250ms before checking if calibration has completed. */
+ msleep(250);
+
+ retval = data->ops->calibrate_result(client, val);
+ if (retval)
+ dev_err(dev, "failed to check calibration result: %d\n",
+ retval);
+ else if (val[0] == 0)
+ break; /* calibration done */
+
+ } while (--tries);
+
+ if (tries == 0) {
+ dev_err(dev, "failed to calibrate. Timeout.\n");
+ retval = -ETIMEDOUT;
+ }
+
+out_disable_calibrate:
+ data->mode &= ~ETP_ENABLE_CALIBRATE;
+ error = data->ops->set_mode(data->client, data->mode);
+ if (error) {
+ dev_err(dev, "failed to disable calibration mode: %d\n",
+ error);
+ if (!retval)
+ retval = error;
+ }
+out:
+ enable_irq(client->irq);
+ mutex_unlock(&data->sysfs_mutex);
+ return retval ?: count;
+}
+
+static ssize_t elan_sysfs_read_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ int error;
+ enum tp_mode mode;
+
+ error = mutex_lock_interruptible(&data->sysfs_mutex);
+ if (error)
+ return error;
+
+ error = data->ops->iap_get_mode(data->client, &mode);
+
+ mutex_unlock(&data->sysfs_mutex);
+
+ if (error)
+ return error;
+
+ return sprintf(buf, "%d\n", (int)mode);
+}
+
+static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
+static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
+static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
+static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
+static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
+static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
+static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
+
+static DEVICE_ATTR_WO(calibrate);
+
+static struct attribute *elan_sysfs_entries[] = {
+ &dev_attr_product_id.attr,
+ &dev_attr_firmware_version.attr,
+ &dev_attr_sample_version.attr,
+ &dev_attr_iap_version.attr,
+ &dev_attr_fw_checksum.attr,
+ &dev_attr_calibrate.attr,
+ &dev_attr_mode.attr,
+ &dev_attr_update_fw.attr,
+ NULL,
+};
+
+static const struct attribute_group elan_sysfs_group = {
+ .attrs = elan_sysfs_entries,
+};
+
+static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct elan_tp_data *data = i2c_get_clientdata(client);
+ int error;
+ int retval;
+
+ retval = mutex_lock_interruptible(&data->sysfs_mutex);
+ if (retval)
+ return retval;
+
+ disable_irq(client->irq);
+
+ data->baseline_ready = false;
+
+ data->mode |= ETP_ENABLE_CALIBRATE;
+ retval = data->ops->set_mode(data->client, data->mode);
+ if (retval) {
+ dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
+ retval);
+ goto out;
+ }
+
+ msleep(250);
+
+ retval = data->ops->get_baseline_data(data->client, true,
+ &data->max_baseline);
+ if (retval) {
+ dev_err(dev, "Failed to read max baseline form device: %d\n",
+ retval);
+ goto out_disable_calibrate;
+ }
+
+ retval = data->ops->get_baseline_data(data->client, false,
+ &data->min_baseline);
+ if (retval) {
+ dev_err(dev, "Failed to read min baseline form device: %d\n",
+ retval);
+ goto out_disable_calibrate;
+ }
+
+ data->baseline_ready = true;
+
+out_disable_calibrate:
+ data->mode &= ~ETP_ENABLE_CALIBRATE;
+ error = data->ops->set_mode(data->client, data->mode);
+ if (error) {
+ dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
+ error);
+ if (!retval)
+ retval = error;
+ }
+out:
+ enable_irq(client->irq);
+ mutex_unlock(&data->sysfs_mutex);
+ return retval ?: count;
+}
+
+static ssize_t min_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ int retval;
+
+ retval = mutex_lock_interruptible(&data->sysfs_mutex);
+ if (retval)
+ return retval;
+
+ if (!data->baseline_ready) {
+ retval = -ENODATA;
+ goto out;
+ }
+
+ retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
+
+out:
+ mutex_unlock(&data->sysfs_mutex);
+ return retval;
+}
+
+static ssize_t max_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct elan_tp_data *data = dev_get_drvdata(dev);
+ int retval;
+
+ retval = mutex_lock_interruptible(&data->sysfs_mutex);
+ if (retval)
+ return retval;
+
+ if (!data->baseline_ready) {
+ retval = -ENODATA;
+ goto out;
+ }
+
+ retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
+
+out:
+ mutex_unlock(&data->sysfs_mutex);
+ return retval;
+}
+
+
+static DEVICE_ATTR_WO(acquire);
+static DEVICE_ATTR_RO(min);
+static DEVICE_ATTR_RO(max);
+
+static struct attribute *elan_baseline_sysfs_entries[] = {
+ &dev_attr_acquire.attr,
+ &dev_attr_min.attr,
+ &dev_attr_max.attr,
+ NULL,
+};
+
+static const struct attribute_group elan_baseline_sysfs_group = {
+ .name = "baseline",
+ .attrs = elan_baseline_sysfs_entries,
+};
+
+static const struct attribute_group *elan_sysfs_groups[] = {
+ &elan_sysfs_group,
+ &elan_baseline_sysfs_group,
+ NULL
+};
+
+/*
+ ******************************************************************
+ * Elan isr functions
+ ******************************************************************
+ */
+static void elan_report_contact(struct elan_tp_data *data,
+ int contact_num, bool contact_valid,
+ u8 *finger_data)
+{
+ struct input_dev *input = data->input;
+ unsigned int pos_x, pos_y;
+ unsigned int pressure, mk_x, mk_y;
+ unsigned int area_x, area_y, major, minor, new_pressure;
+
+
+ if (contact_valid) {
+ pos_x = ((finger_data[0] & 0xf0) << 4) |
+ finger_data[1];
+ pos_y = ((finger_data[0] & 0x0f) << 8) |
+ finger_data[2];
+ mk_x = (finger_data[3] & 0x0f);
+ mk_y = (finger_data[3] >> 4);
+ pressure = finger_data[4];
+
+ if (pos_x > data->max_x || pos_y > data->max_y) {
+ dev_dbg(input->dev.parent,
+ "[%d] x=%d y=%d over max (%d, %d)",
+ contact_num, pos_x, pos_y,
+ data->max_x, data->max_y);
+ return;
+ }
+
+ /*
+ * To avoid treating large finger as palm, let's 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, contact_num);
+ 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, data->max_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);
+ } else {
+ input_mt_slot(input, contact_num);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
+ }
+}
+
+static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
+{
+ struct input_dev *input = data->input;
+ u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
+ int i;
+ u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
+ bool contact_valid;
+
+ for (i = 0; i < ETP_MAX_FINGERS; i++) {
+ contact_valid = tp_info & (1U << (3 + i));
+ elan_report_contact(data, i, contact_valid, finger_data);
+
+ if (contact_valid)
+ finger_data += ETP_FINGER_DATA_LEN;
+ }
+
+ input_report_key(input, BTN_LEFT, tp_info & 0x01);
+ 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;
+ struct device *dev = &data->client->dev;
+ int error;
+ u8 report[ETP_MAX_REPORT_LEN];
+
+ /*
+ * When device is connected to i2c bus, when all IAP page writes
+ * complete, the driver will receive interrupt and must read
+ * 0000 to confirm that IAP is finished.
+ */
+ if (data->in_fw_update) {
+ complete(&data->fw_completion);
+ goto out;
+ }
+
+ error = data->ops->get_report(data->client, report);
+ if (error)
+ goto out;
+
+ if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
+ dev_err(dev, "invalid report id data (%x)\n",
+ report[ETP_REPORT_ID_OFFSET]);
+ else
+ elan_report_absolute(data, report);
+
+out:
+ return IRQ_HANDLED;
+}
+
+/*
+ ******************************************************************
+ * Elan initialization functions
+ ******************************************************************
+ */
+static int elan_setup_input_device(struct elan_tp_data *data)
+{
+ struct device *dev = &data->client->dev;
+ struct input_dev *input;
+ unsigned int max_width = max(data->width_x, data->width_y);
+ unsigned int min_width = min(data->width_x, data->width_y);
+ int error;
+
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = "Elan Touchpad";
+ input->id.bustype = BUS_I2C;
+ input_set_drvdata(input, data);
+
+ error = input_mt_init_slots(input, ETP_MAX_FINGERS,
+ INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
+ if (error) {
+ dev_err(dev, "failed to initialize MT slots: %d\n", error);
+ return error;
+ }
+
+ __set_bit(EV_ABS, input->evbit);
+ __set_bit(INPUT_PROP_POINTER, input->propbit);
+ __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+ __set_bit(BTN_LEFT, input->keybit);
+
+ /* Set up ST parameters */
+ 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, data->x_res);
+ input_abs_set_res(input, ABS_Y, data->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);
+
+ /* And MT parameters */
+ 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, data->x_res);
+ input_abs_set_res(input, ABS_MT_POSITION_Y, data->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);
+
+ data->input = input;
+
+ return 0;
+}
+
+static void elan_disable_regulator(void *_data)
+{
+ struct elan_tp_data *data = _data;
+
+ regulator_disable(data->vcc);
+}
+
+static void elan_remove_sysfs_groups(void *_data)
+{
+ struct elan_tp_data *data = _data;
+
+ sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
+}
+
+static int elan_probe(struct i2c_client *client,
+ const struct i2c_device_id *dev_id)
+{
+ const struct elan_transport_ops *transport_ops;
+ struct device *dev = &client->dev;
+ struct elan_tp_data *data;
+ unsigned long irqflags;
+ int error;
+
+ if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
+ i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ transport_ops = &elan_i2c_ops;
+ } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
+ i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK)) {
+ transport_ops = &elan_smbus_ops;
+ } else {
+ dev_err(dev, "not a supported I2C/SMBus adapter\n");
+ return -EIO;
+ }
+
+ data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->ops = transport_ops;
+ data->client = client;
+ init_completion(&data->fw_completion);
+ mutex_init(&data->sysfs_mutex);
+
+ data->vcc = devm_regulator_get(&client->dev, "vcc");
+ if (IS_ERR(data->vcc)) {
+ error = PTR_ERR(data->vcc);
+ if (error != -EPROBE_DEFER)
+ dev_err(&client->dev,
+ "Failed to get 'vcc' regulator: %d\n",
+ error);
+ return error;
+ }
+
+ error = regulator_enable(data->vcc);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to enable regulator: %d\n", error);
+ return error;
+ }
+
+ error = devm_add_action(&client->dev,
+ elan_disable_regulator, data);
+ if (error) {
+ regulator_disable(data->vcc);
+ dev_err(&client->dev,
+ "Failed to add disable regulator action: %d\n",
+ error);
+ return error;
+ }
+
+ /* Initialize the touchpad. */
+ error = elan_initialize(data);
+ if (error)
+ return error;
+
+ error = elan_query_device_info(data);
+ if (error)
+ return error;
+
+ error = elan_query_device_parameters(data);
+ if (error)
+ return error;
+
+ dev_dbg(&client->dev,
+ "Elan Touchpad Information:\n"
+ " Module product 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->product_id,
+ data->fw_version,
+ data->sm_version,
+ data->iap_version,
+ data->max_x, data->max_y,
+ data->width_x, data->width_y,
+ data->x_res, data->y_res);
+
+ /* Set up input device properties based on queried parameters. */
+ error = elan_setup_input_device(data);
+ if (error)
+ return error;
+
+ /*
+ * Systems using device tree should set up interrupt via DTS,
+ * the rest will use the default falling edge interrupts.
+ */
+ irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, elan_isr,
+ irqflags | IRQF_ONESHOT,
+ client->name, data);
+ if (error) {
+ dev_err(&client->dev, "cannot register irq=%d\n", client->irq);
+ return error;
+ }
+
+ error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups);
+ if (error) {
+ dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
+ error);
+ return error;
+ }
+
+ error = devm_add_action(&client->dev,
+ elan_remove_sysfs_groups, data);
+ if (error) {
+ elan_remove_sysfs_groups(data);
+ dev_err(&client->dev,
+ "Failed to add sysfs cleanup action: %d\n",
+ error);
+ return error;
+ }
+
+ error = input_register_device(data->input);
+ if (error) {
+ dev_err(&client->dev, "failed to register input device: %d\n",
+ error);
+ return error;
+ }
+
+ /*
+ * Systems using device tree should set up wakeup via DTS,
+ * the rest will configure device as wakeup source by default.
+ */
+ if (!client->dev.of_node)
+ device_init_wakeup(&client->dev, true);
+
+ i2c_set_clientdata(client, data);
+
+ return 0;
+}
+
+static int __maybe_unused elan_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct elan_tp_data *data = i2c_get_clientdata(client);
+ int ret;
+
+ /*
+ * We are taking the mutex to make sure sysfs operations are
+ * complete before we attempt to bring the device into low[er]
+ * power mode.
+ */
+ ret = mutex_lock_interruptible(&data->sysfs_mutex);
+ if (ret)
+ return ret;
+
+ disable_irq(client->irq);
+
+ if (device_may_wakeup(dev)) {
+ ret = elan_sleep(data);
+ /* Enable wake from IRQ */
+ data->irq_wake = (enable_irq_wake(client->irq) == 0);
+ } else {
+ ret = elan_disable_power(data);
+ }
+
+ mutex_unlock(&data->sysfs_mutex);
+ return ret;
+}
+
+static int __maybe_unused elan_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct elan_tp_data *data = i2c_get_clientdata(client);
+ int error;
+
+ if (device_may_wakeup(dev) && data->irq_wake) {
+ disable_irq_wake(client->irq);
+ data->irq_wake = false;
+ }
+
+ error = elan_enable_power(data);
+ if (error)
+ dev_err(dev, "power up when resuming failed: %d\n", error);
+
+ error = elan_initialize(data);
+ if (error)
+ dev_err(dev, "initialize when resuming failed: %d\n", error);
+
+ enable_irq(data->client->irq);
+
+ return 0;
+}
+
+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);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id elan_acpi_id[] = {
+ { "ELAN0000", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id elan_of_match[] = {
+ { .compatible = "elan,i2c_touchpad" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, elan_of_match);
+#endif
+
+static struct i2c_driver elan_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .pm = &elan_pm_ops,
+ .acpi_match_table = ACPI_PTR(elan_acpi_id),
+ .of_match_table = of_match_ptr(elan_of_match),
+ },
+ .probe = elan_probe,
+ .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");
+MODULE_VERSION(ELAN_DRIVER_VERSION);
diff --git a/drivers/input/mouse/elan_i2c_i2c.c b/drivers/input/mouse/elan_i2c_i2c.c
new file mode 100644
index 0000000..047b257
--- /dev/null
+++ b/drivers/input/mouse/elan_i2c_i2c.c
@@ -0,0 +1,612 @@
+/*
+ * Elan I2C/SMBus Touchpad driver - I2C interface
+ *
+ * Copyright (c) 2013 ELAN Microelectronics Corp.
+ *
+ * Author: ææç (Duson Lin) <dusonlin@xxxxxxxxxx>
+ * Version: 1.5.5
+ *
+ * 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/completion.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <asm/unaligned.h>
+
+#include "elan_i2c.h"
+
+/* Elan i2c commands */
+#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_POWER_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_MAX_BASELINE_CMD 0x0317
+#define ETP_I2C_MIN_BASELINE_CMD 0x0318
+
+#define ETP_I2C_REPORT_LEN 34
+#define ETP_I2C_DESC_LENGTH 30
+#define ETP_I2C_REPORT_DESC_LENGTH 158
+#define ETP_I2C_INF_LENGTH 2
+#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
+
+static int elan_i2c_read_block(struct i2c_client *client,
+ u16 reg, u8 *val, u16 len)
+{
+ __le16 buf[] = {
+ cpu_to_le16(reg),
+ };
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .flags = client->flags & I2C_M_TEN,
+ .len = sizeof(buf),
+ .buf = (u8 *)buf,
+ },
+ {
+ .addr = client->addr,
+ .flags = (client->flags & I2C_M_TEN) | I2C_M_RD,
+ .len = len,
+ .buf = val,
+ }
+ };
+ int ret;
+
+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO);
+}
+
+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_I2C_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)
+{
+ __le16 buf[] = {
+ cpu_to_le16(reg),
+ cpu_to_le16(cmd),
+ };
+ struct i2c_msg msg = {
+ .addr = client->addr,
+ .flags = client->flags & I2C_M_TEN,
+ .len = sizeof(buf),
+ .buf = (u8 *)buf,
+ };
+ int ret;
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ return ret == 1 ? 0 : (ret < 0 ? ret : -EIO);
+}
+
+static int elan_i2c_initialize(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ int error;
+ u8 val[256];
+
+ error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
+ if (error) {
+ dev_err(dev, "device reset failed: %d\n", error);
+ return error;
+ }
+
+ /* Wait for the device to reset */
+ msleep(100);
+
+ /* get reset acknowledgement 0000 */
+ error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH);
+ if (error < 0) {
+ dev_err(dev, "failed to read reset response: %d\n", error);
+ return error;
+ }
+
+ error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD,
+ val, ETP_I2C_DESC_LENGTH);
+ if (error) {
+ dev_err(dev, "cannot get device descriptor: %d\n", error);
+ return error;
+ }
+
+ error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
+ val, ETP_I2C_REPORT_DESC_LENGTH);
+ if (error) {
+ dev_err(dev, "fetching report descriptor failed.: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
+ sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP);
+}
+
+static int elan_i2c_power_control(struct i2c_client *client, bool enable)
+{
+ u8 val[2];
+ u16 reg;
+ int error;
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to read current power state: %d\n",
+ error);
+ return error;
+ }
+
+ reg = le16_to_cpup((__le16 *)val);
+ if (enable)
+ reg &= ~ETP_DISABLE_POWER;
+ else
+ reg |= ETP_DISABLE_POWER;
+
+ error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD,
+ cpu_to_le16(reg));
+ if (error) {
+ dev_err(&client->dev,
+ "failed to write current power state: %d\n",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_i2c_set_mode(struct i2c_client *client, u8 mode)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode);
+}
+
+
+static int elan_i2c_calibrate(struct i2c_client *client)
+{
+ return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1);
+}
+
+static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val)
+{
+ return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1);
+}
+
+static int elan_i2c_get_baseline_data(struct i2c_client *client,
+ bool max_baseline, u8 *value)
+{
+ int error;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client,
+ max_baseline ? ETP_I2C_MAX_BASELINE_CMD :
+ ETP_I2C_MIN_BASELINE_CMD,
+ val);
+ if (error)
+ return error;
+
+ *value = le16_to_cpup((__le16 *)val);
+
+ return 0;
+}
+
+static int elan_i2c_get_version(struct i2c_client *client,
+ bool iap, u8 *version)
+{
+ int error;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client,
+ iap ? ETP_I2C_IAP_VERSION_CMD :
+ ETP_I2C_FW_VERSION_CMD,
+ val);
+ if (error) {
+ dev_err(&client->dev, "failed to get %s version: %d\n",
+ iap ? "IAP" : "FW", error);
+ return error;
+ }
+
+ *version = val[0];
+ return 0;
+}
+
+static int elan_i2c_get_sm_version(struct i2c_client *client, u8 *version)
+{
+ int error;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_SM_VERSION_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get SM version: %d\n", error);
+ return error;
+ }
+
+ *version = val[0];
+ return 0;
+}
+
+static int elan_i2c_get_product_id(struct i2c_client *client, u8 *id)
+{
+ int error;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get product ID: %d\n", error);
+ return error;
+ }
+
+ *id = val[0];
+ return 0;
+}
+
+static int elan_i2c_get_checksum(struct i2c_client *client,
+ bool iap, u16 *csum)
+{
+ int error;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client,
+ iap ? ETP_I2C_IAP_CHECKSUM_CMD :
+ ETP_I2C_FW_CHECKSUM_CMD,
+ val);
+ if (error) {
+ dev_err(&client->dev, "failed to get %s checksum: %d\n",
+ iap ? "IAP" : "FW", error);
+ return error;
+ }
+
+ *csum = le16_to_cpup((__le16 *)val);
+ return 0;
+}
+
+static int elan_i2c_get_max(struct i2c_client *client,
+ unsigned int *max_x, unsigned int *max_y)
+{
+ int error;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get X dimension: %d\n", error);
+ return error;
+ }
+
+ *max_x = le16_to_cpup((__le16 *)val) & 0x0fff;
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get Y dimension: %d\n", error);
+ return error;
+ }
+
+ *max_y = le16_to_cpup((__le16 *)val) & 0x0fff;
+
+ return 0;
+}
+
+static int elan_i2c_get_resolution(struct i2c_client *client,
+ u8 *hw_res_x, u8 *hw_res_y)
+{
+ int error;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get resolution: %d\n", error);
+ return error;
+ }
+
+ *hw_res_x = val[0];
+ *hw_res_y = val[1];
+
+ return 0;
+}
+
+static int elan_i2c_get_num_traces(struct i2c_client *client,
+ unsigned int *x_traces,
+ unsigned int *y_traces)
+{
+ int error;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get trace info: %d\n", error);
+ return error;
+ }
+
+ *x_traces = val[0] - 1;
+ *y_traces = val[1] - 1;
+
+ return 0;
+}
+
+static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode)
+{
+ int error;
+ u16 constant;
+ u8 val[3];
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to read iap control register: %d\n",
+ error);
+ return error;
+ }
+
+ constant = le16_to_cpup((__le16 *)val);
+ dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
+
+ *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE;
+
+ return 0;
+}
+
+static int elan_i2c_iap_reset(struct i2c_client *client)
+{
+ int error;
+
+ error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
+ ETP_I2C_IAP_RESET);
+ if (error) {
+ dev_err(&client->dev, "cannot reset IC: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_i2c_set_flash_key(struct i2c_client *client)
+{
+ int error;
+
+ error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
+ ETP_I2C_IAP_PASSWORD);
+ if (error) {
+ dev_err(&client->dev, "cannot set flash key: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_i2c_prepare_fw_update(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ int error;
+ enum tp_mode mode;
+ u8 val[3];
+ u16 password;
+
+ /* Get FW in which mode (IAP_MODE/MAIN_MODE) */
+ error = elan_i2c_iap_get_mode(client, &mode);
+ if (error)
+ return error;
+
+ if (mode == IAP_MODE) {
+ /* Reset IC */
+ error = elan_i2c_iap_reset(client);
+ if (error)
+ return error;
+
+ msleep(30);
+ }
+
+ /* Set flash key*/
+ error = elan_i2c_set_flash_key(client);
+ if (error)
+ return error;
+
+ /* Wait for F/W IAP initialization */
+ msleep(mode == MAIN_MODE ? 100 : 30);
+
+ /* Check if we are in IAP mode or not */
+ error = elan_i2c_iap_get_mode(client, &mode);
+ if (error)
+ return error;
+
+ if (mode == MAIN_MODE) {
+ dev_err(dev, "wrong mode: %d\n", mode);
+ return -EIO;
+ }
+
+ /* Set flash key again */
+ error = elan_i2c_set_flash_key(client);
+ if (error)
+ return error;
+
+ /* Wait for F/W IAP initialization */
+ msleep(30);
+
+ /* read back to check we actually enabled successfully. */
+ error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val);
+ if (error) {
+ dev_err(dev, "cannot read iap password: %d\n",
+ error);
+ return error;
+ }
+
+ password = le16_to_cpup((__le16 *)val);
+ if (password != ETP_I2C_IAP_PASSWORD) {
+ dev_err(dev, "wrong iap password: 0x%X\n", password);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int elan_i2c_write_fw_block(struct i2c_client *client,
+ const u8 *page, u16 checksum, int idx)
+{
+ struct device *dev = &client->dev;
+ u8 page_store[ETP_FW_PAGE_SIZE + 4];
+ u8 val[3];
+ u16 result;
+ int ret, error;
+
+ page_store[0] = ETP_I2C_IAP_REG_L;
+ page_store[1] = ETP_I2C_IAP_REG_H;
+ memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE);
+ /* recode checksum at last two bytes */
+ put_unaligned_le16(checksum, &page_store[ETP_FW_PAGE_SIZE + 2]);
+
+ ret = i2c_master_send(client, page_store, sizeof(page_store));
+ if (ret != sizeof(page_store)) {
+ error = ret < 0 ? ret : -EIO;
+ dev_err(dev, "Failed to write page %d: %d\n", idx, error);
+ return error;
+ }
+
+ /* Wait for F/W to update one page ROM data. */
+ msleep(20);
+
+ error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
+ if (error) {
+ dev_err(dev, "Failed to read IAP write result: %d\n", error);
+ return error;
+ }
+
+ result = le16_to_cpup((__le16 *)val);
+ if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
+ dev_err(dev, "IAP reports failed write: %04hx\n",
+ result);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int elan_i2c_finish_fw_update(struct i2c_client *client,
+ struct completion *completion)
+{
+ struct device *dev = &client->dev;
+ long ret;
+ int error;
+ int len;
+ u8 buffer[ETP_I2C_INF_LENGTH];
+
+ reinit_completion(completion);
+ enable_irq(client->irq);
+
+ error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
+ if (!error)
+ ret = wait_for_completion_interruptible_timeout(completion,
+ msecs_to_jiffies(300));
+ disable_irq(client->irq);
+
+ if (error) {
+ dev_err(dev, "device reset failed: %d\n", error);
+ return error;
+ } else if (ret == 0) {
+ dev_err(dev, "timeout waiting for device reset\n");
+ return -ETIMEDOUT;
+ } else if (ret < 0) {
+ error = ret;
+ dev_err(dev, "error waiting for device reset: %d\n", error);
+ return error;
+ }
+
+ len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
+ if (len != ETP_I2C_INF_LENGTH) {
+ error = len < 0 ? len : -EIO;
+ dev_err(dev, "failed to read INT signal: %d (%d)\n",
+ error, len);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_i2c_get_report(struct i2c_client *client, u8 *report)
+{
+ int len;
+
+ len = i2c_master_recv(client, report, ETP_I2C_REPORT_LEN);
+ if (len < 0) {
+ dev_err(&client->dev, "failed to read report data: %d\n", len);
+ return len;
+ }
+
+ if (len != ETP_I2C_REPORT_LEN) {
+ dev_err(&client->dev,
+ "wrong report length (%d vs %d expected)\n",
+ len, ETP_I2C_REPORT_LEN);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+const struct elan_transport_ops elan_i2c_ops = {
+ .initialize = elan_i2c_initialize,
+ .sleep_control = elan_i2c_sleep_control,
+ .power_control = elan_i2c_power_control,
+ .set_mode = elan_i2c_set_mode,
+
+ .calibrate = elan_i2c_calibrate,
+ .calibrate_result = elan_i2c_calibrate_result,
+
+ .get_baseline_data = elan_i2c_get_baseline_data,
+
+ .get_version = elan_i2c_get_version,
+ .get_sm_version = elan_i2c_get_sm_version,
+ .get_product_id = elan_i2c_get_product_id,
+ .get_checksum = elan_i2c_get_checksum,
+
+ .get_max = elan_i2c_get_max,
+ .get_resolution = elan_i2c_get_resolution,
+ .get_num_traces = elan_i2c_get_num_traces,
+
+ .iap_get_mode = elan_i2c_iap_get_mode,
+ .iap_reset = elan_i2c_iap_reset,
+
+ .prepare_fw_update = elan_i2c_prepare_fw_update,
+ .write_fw_block = elan_i2c_write_fw_block,
+ .finish_fw_update = elan_i2c_finish_fw_update,
+
+ .get_report = elan_i2c_get_report,
+};
diff --git a/drivers/input/mouse/elan_i2c_smbus.c b/drivers/input/mouse/elan_i2c_smbus.c
new file mode 100644
index 0000000..e58d82b
--- /dev/null
+++ b/drivers/input/mouse/elan_i2c_smbus.c
@@ -0,0 +1,514 @@
+/*
+ * Elan I2C/SMBus Touchpad driver - SMBus interface
+ *
+ * Copyright (c) 2013 ELAN Microelectronics Corp.
+ *
+ * Author: ææç (Duson Lin) <dusonlin@xxxxxxxxxx>
+ * Version: 1.5.5
+ *
+ * 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/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#include "elan_i2c.h"
+
+/* Elan SMbus commands */
+#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_REPORT_OFFSET 2
+#define ETP_SMBUS_HELLOPACKET_LEN 5
+#define ETP_SMBUS_IAP_PASSWORD 0x1234
+#define ETP_SMBUS_IAP_MODE_ON (1 << 6)
+
+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 len, error;
+
+ /* Get hello packet */
+ len = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_HELLOPACKET_CMD, values);
+ if (len != ETP_SMBUS_HELLOPACKET_LEN) {
+ dev_err(&client->dev, "hello packet length fail: %d\n", len);
+ error = len < 0 ? len : -EIO;
+ return error;
+ }
+
+ /* compare hello packet */
+ if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) {
+ dev_err(&client->dev, "hello packet fail [%*px]\n",
+ ETP_SMBUS_HELLOPACKET_LEN, values);
+ return -ENXIO;
+ }
+
+ /* enable tp */
+ error = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP);
+ if (error) {
+ dev_err(&client->dev, "failed to enable touchpad: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_smbus_set_mode(struct i2c_client *client, u8 mode)
+{
+ u8 cmd[4] = { 0x00, 0x07, 0x00, mode };
+
+ return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
+ sizeof(cmd), cmd);
+}
+
+static int elan_smbus_sleep_control(struct i2c_client *client, bool sleep)
+{
+ if (sleep)
+ return i2c_smbus_write_byte(client, ETP_SMBUS_SLEEP_CMD);
+ else
+ return 0; /* XXX should we send ETP_SMBUS_ENABLE_TP here? */
+}
+
+static int elan_smbus_power_control(struct i2c_client *client, bool enable)
+{
+ return 0; /* A no-op */
+}
+
+static int elan_smbus_calibrate(struct i2c_client *client)
+{
+ u8 cmd[4] = { 0x00, 0x08, 0x00, 0x01 };
+
+ return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
+ sizeof(cmd), cmd);
+}
+
+static int elan_smbus_calibrate_result(struct i2c_client *client, u8 *val)
+{
+ int error;
+
+ error = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_CALIBRATE_QUERY, val);
+ if (error < 0)
+ return error;
+
+ return 0;
+}
+
+static int elan_smbus_get_baseline_data(struct i2c_client *client,
+ bool max_baseline, u8 *value)
+{
+ int error;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client,
+ max_baseline ?
+ ETP_SMBUS_MAX_BASELINE_CMD :
+ ETP_SMBUS_MIN_BASELINE_CMD,
+ val);
+ if (error < 0)
+ return error;
+
+ *value = be16_to_cpup((__be16 *)val);
+
+ return 0;
+}
+
+static int elan_smbus_get_version(struct i2c_client *client,
+ bool iap, u8 *version)
+{
+ int error;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client,
+ iap ? ETP_SMBUS_IAP_VERSION_CMD :
+ ETP_SMBUS_FW_VERSION_CMD,
+ val);
+ if (error < 0) {
+ dev_err(&client->dev, "failed to get %s version: %d\n",
+ iap ? "IAP" : "FW", error);
+ return error;
+ }
+
+ *version = val[2];
+ return 0;
+}
+
+static int elan_smbus_get_sm_version(struct i2c_client *client, u8 *version)
+{
+ int error;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_SM_VERSION_CMD, val);
+ if (error < 0) {
+ dev_err(&client->dev, "failed to get SM version: %d\n", error);
+ return error;
+ }
+
+ *version = val[0]; /* XXX Why 0 and not 2 as in IAP/FW versions? */
+ return 0;
+}
+
+static int elan_smbus_get_product_id(struct i2c_client *client, u8 *id)
+{
+ int error;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_UNIQUEID_CMD, val);
+ if (error < 0) {
+ dev_err(&client->dev, "failed to get product ID: %d\n", error);
+ return error;
+ }
+
+ *id = val[1];
+ return 0;
+}
+
+static int elan_smbus_get_checksum(struct i2c_client *client,
+ bool iap, u16 *csum)
+{
+ int error;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client,
+ iap ? ETP_SMBUS_FW_CHECKSUM_CMD :
+ ETP_SMBUS_IAP_CHECKSUM_CMD,
+ val);
+ if (error < 0) {
+ dev_err(&client->dev, "failed to get %s checksum: %d\n",
+ iap ? "IAP" : "FW", error);
+ return error;
+ }
+
+ *csum = be16_to_cpup((__be16 *)val);
+ return 0;
+}
+
+static int elan_smbus_get_max(struct i2c_client *client,
+ unsigned int *max_x, unsigned int *max_y)
+{
+ int error;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get dimensions: %d\n", error);
+ return error;
+ }
+
+ *max_x = (0x0f & val[0]) << 8 | val[1];
+ *max_y = (0xf0 & val[0]) << 4 | val[2];
+
+ return 0;
+}
+
+static int elan_smbus_get_resolution(struct i2c_client *client,
+ u8 *hw_res_x, u8 *hw_res_y)
+{
+ int error;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_RESOLUTION_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get resolution: %d\n", error);
+ return error;
+ }
+
+ *hw_res_x = val[1] & 0x0F;
+ *hw_res_y = (val[1] & 0xF0) >> 4;
+
+ return 0;
+}
+
+static int elan_smbus_get_num_traces(struct i2c_client *client,
+ unsigned int *x_traces,
+ unsigned int *y_traces)
+{
+ int error;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_XY_TRACENUM_CMD, val);
+ if (error) {
+ dev_err(&client->dev, "failed to get trace info: %d\n", error);
+ return error;
+ }
+
+ *x_traces = val[1] - 1;
+ *y_traces = val[2] - 1;
+
+ return 0;
+}
+
+static int elan_smbus_iap_get_mode(struct i2c_client *client,
+ enum tp_mode *mode)
+{
+ int error;
+ u16 constant;
+ u8 val[3];
+
+ error = i2c_smbus_read_block_data(client, ETP_SMBUS_IAP_CTRL_CMD, val);
+ if (error < 0) {
+ dev_err(&client->dev, "failed to read iap ctrol register: %d\n",
+ error);
+ return error;
+ }
+
+ constant = be16_to_cpup((__be16 *)val);
+ dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
+
+ *mode = (constant & ETP_SMBUS_IAP_MODE_ON) ? IAP_MODE : MAIN_MODE;
+
+ return 0;
+}
+
+static int elan_smbus_iap_reset(struct i2c_client *client)
+{
+ int error;
+
+ error = i2c_smbus_write_byte(client, ETP_SMBUS_IAP_RESET_CMD);
+ if (error) {
+ dev_err(&client->dev, "cannot reset IC: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_smbus_set_flash_key(struct i2c_client *client)
+{
+ int error;
+ u8 cmd[4] = { 0x00, 0x0B, 0x00, 0x5A };
+
+ error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
+ sizeof(cmd), cmd);
+ if (error) {
+ dev_err(&client->dev, "cannot set flash key: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int elan_smbus_prepare_fw_update(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ int len;
+ int error;
+ enum tp_mode mode;
+ u8 val[3];
+ u8 cmd[4] = {0x0F, 0x78, 0x00, 0x06};
+ u16 password;
+
+ /* Get FW in which mode (IAP_MODE/MAIN_MODE) */
+ error = elan_smbus_iap_get_mode(client, &mode);
+ if (error)
+ return error;
+
+ if (mode == MAIN_MODE) {
+
+ /* set flash key */
+ error = elan_smbus_set_flash_key(client);
+ if (error)
+ return error;
+
+ /* write iap password */
+ if (i2c_smbus_write_byte(client,
+ ETP_SMBUS_IAP_PASSWORD_WRITE) < 0) {
+ dev_err(dev, "cannot write iap password\n");
+ return -EIO;
+ }
+
+ error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
+ sizeof(cmd), cmd);
+ if (error) {
+ dev_err(dev, "failed to write iap password: %d\n",
+ error);
+ return error;
+ }
+
+ /*
+ * Read back password to make sure we enabled flash
+ * successfully.
+ */
+ len = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_IAP_PASSWORD_READ,
+ val);
+ if (len != sizeof(ETP_SMBUS_IAP_PASSWORD)) {
+ error = len < 0 ? len : -EIO;
+ dev_err(dev, "failed to read iap password: %d\n",
+ error);
+ return error;
+ }
+
+ password = be16_to_cpup((__be16 *)val);
+ if (password != ETP_SMBUS_IAP_PASSWORD) {
+ dev_err(dev, "wrong iap password = 0x%X\n", password);
+ return -EIO;
+ }
+
+ /* Wait 30ms for MAIN_MODE change to IAP_MODE */
+ msleep(30);
+ }
+
+ error = elan_smbus_set_flash_key(client);
+ if (error)
+ return error;
+
+ /* Reset IC */
+ error = elan_smbus_iap_reset(client);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+
+static int elan_smbus_write_fw_block(struct i2c_client *client,
+ const u8 *page, u16 checksum, int idx)
+{
+ struct device *dev = &client->dev;
+ int error;
+ u16 result;
+ u8 val[3];
+
+ /*
+ * Due to the limitation of smbus protocol limiting
+ * transfer to 32 bytes at a time, we must split block
+ * in 2 transfers.
+ */
+ error = i2c_smbus_write_block_data(client,
+ ETP_SMBUS_WRITE_FW_BLOCK,
+ ETP_FW_PAGE_SIZE / 2,
+ page);
+ if (error) {
+ dev_err(dev, "Failed to write page %d (part %d): %d\n",
+ idx, 1, error);
+ return error;
+ }
+
+ error = i2c_smbus_write_block_data(client,
+ ETP_SMBUS_WRITE_FW_BLOCK,
+ ETP_FW_PAGE_SIZE / 2,
+ page + ETP_FW_PAGE_SIZE / 2);
+ if (error) {
+ dev_err(dev, "Failed to write page %d (part %d): %d\n",
+ idx, 2, error);
+ return error;
+ }
+
+
+ /* Wait for F/W to update one page ROM data. */
+ usleep_range(8000, 10000);
+
+ error = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_IAP_CTRL_CMD, val);
+ if (error < 0) {
+ dev_err(dev, "Failed to read IAP write result: %d\n",
+ error);
+ return error;
+ }
+
+ result = be16_to_cpup((__be16 *)val);
+ if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
+ dev_err(dev, "IAP reports failed write: %04hx\n",
+ result);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int elan_smbus_get_report(struct i2c_client *client, u8 *report)
+{
+ int len;
+
+ len = i2c_smbus_read_block_data(client,
+ ETP_SMBUS_PACKET_QUERY,
+ &report[ETP_SMBUS_REPORT_OFFSET]);
+ if (len < 0) {
+ dev_err(&client->dev, "failed to read report data: %d\n", len);
+ return len;
+ }
+
+ if (len != ETP_SMBUS_REPORT_LEN) {
+ dev_err(&client->dev,
+ "wrong report length (%d vs %d expected)\n",
+ len, ETP_SMBUS_REPORT_LEN);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int elan_smbus_finish_fw_update(struct i2c_client *client,
+ struct completion *fw_completion)
+{
+ /* No special handling unlike I2C transport */
+ return 0;
+}
+
+const struct elan_transport_ops elan_smbus_ops = {
+ .initialize = elan_smbus_initialize,
+ .sleep_control = elan_smbus_sleep_control,
+ .power_control = elan_smbus_power_control,
+ .set_mode = elan_smbus_set_mode,
+
+ .calibrate = elan_smbus_calibrate,
+ .calibrate_result = elan_smbus_calibrate_result,
+
+ .get_baseline_data = elan_smbus_get_baseline_data,
+
+ .get_version = elan_smbus_get_version,
+ .get_sm_version = elan_smbus_get_sm_version,
+ .get_product_id = elan_smbus_get_product_id,
+ .get_checksum = elan_smbus_get_checksum,
+
+ .get_max = elan_smbus_get_max,
+ .get_resolution = elan_smbus_get_resolution,
+ .get_num_traces = elan_smbus_get_num_traces,
+
+ .iap_get_mode = elan_smbus_iap_get_mode,
+ .iap_reset = elan_smbus_iap_reset,
+
+ .prepare_fw_update = elan_smbus_prepare_fw_update,
+ .write_fw_block = elan_smbus_write_fw_block,
+ .finish_fw_update = elan_smbus_finish_fw_update,
+
+ .get_report = elan_smbus_get_report,
+};
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