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elan_i2c_core.c
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elan_i2c_core.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Elan I2C/SMBus Touchpad driver
*
* Copyright (c) 2013 ELAN Microelectronics Corp.
*
* Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
* Author: KT Liao <kt.liao@emc.com.tw>
* Version: 1.6.3
*
* Based on cyapa driver:
* copyright (c) 2011-2012 Cypress Semiconductor, Inc.
* copyright (c) 2011-2012 Google, Inc.
*
* 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/irq.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/property.h>
#include <linux/regulator/consumer.h>
#include <asm/unaligned.h>
#include "elan_i2c.h"
#define DRIVER_NAME "elan_i2c"
#define ELAN_VENDOR_ID 0x04f3
#define ETP_MAX_PRESSURE 255
#define ETP_FWIDTH_REDUCE 90
#define ETP_FINGER_WIDTH 15
#define ETP_RETRY_COUNT 3
/* quirks to control the device */
#define ETP_QUIRK_QUICK_WAKEUP BIT(0)
/* The main device structure */
struct elan_tp_data {
struct i2c_client *client;
struct input_dev *input;
struct input_dev *tp_input; /* trackpoint input node */
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 pattern;
u16 product_id;
u8 fw_version;
u8 sm_version;
u8 iap_version;
u16 fw_checksum;
unsigned int report_features;
unsigned int report_len;
int pressure_adjustment;
u8 mode;
u16 ic_type;
u16 fw_validpage_count;
u16 fw_page_size;
u32 fw_signature_address;
bool irq_wake;
u8 min_baseline;
u8 max_baseline;
bool baseline_ready;
u8 clickpad;
bool middle_button;
u32 quirks; /* Various quirks */
};
static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
{
static const struct {
u16 ic_type;
u16 product_id;
u32 quirks;
} elan_i2c_quirks[] = {
{ 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
{ 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP },
{ 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
{ 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
{ 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
};
u32 quirks = 0;
int i;
for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
if (elan_i2c_quirks[i].ic_type == ic_type &&
elan_i2c_quirks[i].product_id == product_id) {
quirks = elan_i2c_quirks[i].quirks;
}
}
if (ic_type >= 0x0D && product_id >= 0x123)
quirks |= ETP_QUIRK_QUICK_WAKEUP;
return quirks;
}
static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
u32 *signature_address, u16 *page_size)
{
switch (ic_type) {
case 0x00:
case 0x06:
case 0x08:
*validpage_count = 512;
break;
case 0x03:
case 0x07:
case 0x09:
case 0x0A:
case 0x0B:
case 0x0C:
*validpage_count = 768;
break;
case 0x0D:
*validpage_count = 896;
break;
case 0x0E:
*validpage_count = 640;
break;
case 0x10:
*validpage_count = 1024;
break;
case 0x11:
*validpage_count = 1280;
break;
case 0x13:
*validpage_count = 2048;
break;
case 0x14:
case 0x15:
*validpage_count = 1024;
break;
default:
/* unknown ic type clear value */
*validpage_count = 0;
*signature_address = 0;
*page_size = 0;
return -ENXIO;
}
*signature_address =
(*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
*validpage_count /= 8;
*page_size = ETP_FW_PAGE_SIZE_512;
} else if (ic_type >= 0x0D && iap_version >= 1) {
*validpage_count /= 2;
*page_size = ETP_FW_PAGE_SIZE_128;
} else {
*page_size = ETP_FW_PAGE_SIZE;
}
return 0;
}
static int elan_set_power(struct elan_tp_data *data, bool on)
{
int repeat = ETP_RETRY_COUNT;
int error;
do {
error = data->ops->power_control(data->client, on);
if (error >= 0)
return 0;
msleep(30);
} while (--repeat > 0);
dev_err(&data->client->dev, "failed to set power %s: %d\n",
on ? "on" : "off", error);
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_query_product(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_pattern(data->client, &data->pattern);
if (error)
return error;
error = data->ops->get_sm_version(data->client, data->pattern,
&data->ic_type, &data->sm_version,
&data->clickpad);
if (error)
return error;
return 0;
}
static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
{
if (data->ic_type == 0x0E) {
switch (data->product_id) {
case 0x05 ... 0x07:
case 0x09:
case 0x13:
return true;
}
} else if (data->ic_type == 0x08 && data->product_id == 0x26) {
/* ASUS EeeBook X205TA */
return true;
}
return false;
}
static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
{
struct i2c_client *client = data->client;
bool woken_up = false;
int error;
if (!skip_reset) {
error = data->ops->initialize(client);
if (error) {
dev_err(&client->dev, "device initialize failed: %d\n", error);
return error;
}
}
error = elan_query_product(data);
if (error)
return error;
/*
* Some ASUS devices were shipped with firmware that requires
* touchpads to be woken up first, before attempting to switch
* them into absolute reporting mode.
*/
if (elan_check_ASUS_special_fw(data)) {
error = data->ops->sleep_control(client, false);
if (error) {
dev_err(&client->dev,
"failed to wake device up: %d\n", error);
return error;
}
msleep(200);
woken_up = true;
}
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;
}
if (!woken_up) {
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, bool skip_reset)
{
int repeat = ETP_RETRY_COUNT;
int error;
do {
error = __elan_initialize(data, skip_reset);
if (!error)
return 0;
skip_reset = false;
msleep(30);
} while (--repeat > 0);
return error;
}
static int elan_query_device_info(struct elan_tp_data *data)
{
int error;
error = data->ops->get_version(data->client, data->pattern, 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_version(data->client, data->pattern,
true, &data->iap_version);
if (error)
return error;
error = data->ops->get_pressure_adjustment(data->client,
&data->pressure_adjustment);
if (error)
return error;
error = data->ops->get_report_features(data->client, data->pattern,
&data->report_features,
&data->report_len);
if (error)
return error;
data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
error = elan_get_fwinfo(data->ic_type, data->iap_version,
&data->fw_validpage_count,
&data->fw_signature_address,
&data->fw_page_size);
if (error)
dev_warn(&data->client->dev,
"unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
data->iap_version, data->ic_type);
return 0;
}
static unsigned int elan_convert_resolution(u8 val, u8 pattern)
{
/*
* pattern <= 0x01:
* (value from firmware) * 10 + 790 = dpi
* else
* ((value from firmware) + 3) * 100 = dpi
*/
int res = pattern <= 0x01 ?
(int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
/*
* We also have to convert dpi to dots/mm (*10/254 to avoid floating
* point).
*/
return res * 10 / 254;
}
static int elan_query_device_parameters(struct elan_tp_data *data)
{
struct i2c_client *client = data->client;
unsigned int x_traces, y_traces;
u32 x_mm, y_mm;
u8 hw_x_res, hw_y_res;
int error;
if (device_property_read_u32(&client->dev,
"touchscreen-size-x", &data->max_x) ||
device_property_read_u32(&client->dev,
"touchscreen-size-y", &data->max_y)) {
error = data->ops->get_max(data->client,
&data->max_x,
&data->max_y);
if (error)
return error;
} else {
/* size is the maximum + 1 */
--data->max_x;
--data->max_y;
}
if (device_property_read_u32(&client->dev,
"elan,x_traces",
&x_traces) ||
device_property_read_u32(&client->dev,
"elan,y_traces",
&y_traces)) {
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;
if (device_property_read_u32(&client->dev,
"touchscreen-x-mm", &x_mm) ||
device_property_read_u32(&client->dev,
"touchscreen-y-mm", &y_mm)) {
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->pattern);
data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
} else {
data->x_res = (data->max_x + 1) / x_mm;
data->y_res = (data->max_y + 1) / y_mm;
}
if (device_property_read_bool(&client->dev, "elan,clickpad"))
data->clickpad = 1;
if (device_property_read_bool(&client->dev, "elan,middle-button"))
data->middle_button = true;
return 0;
}
/*
**********************************************************
* IAP firmware updater related routines
**********************************************************
*/
static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
const u8 *page, u16 checksum, int idx)
{
int retry = ETP_RETRY_COUNT;
int error;
do {
error = data->ops->write_fw_block(data->client, page_size,
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, data->ic_type,
data->iap_version,
data->fw_page_size);
if (error)
return error;
iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
for (i = boot_page_count; i < data->fw_validpage_count; i++) {
u16 checksum = 0;
const u8 *page = &fw->data[i * data->fw_page_size];
for (j = 0; j < data->fw_page_size; j += 2)
checksum += ((page[j + 1] << 8) | page[j]);
error = elan_write_fw_block(data, data->fw_page_size,
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, false);
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 i2c_client *client = to_i2c_client(dev);
struct elan_tp_data *data = i2c_get_clientdata(client);
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 i2c_client *client = to_i2c_client(dev);
struct elan_tp_data *data = i2c_get_clientdata(client);
return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
data->product_id);
}
static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct elan_tp_data *data = i2c_get_clientdata(client);
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 i2c_client *client = to_i2c_client(dev);
struct elan_tp_data *data = i2c_get_clientdata(client);
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 i2c_client *client = to_i2c_client(dev);
struct elan_tp_data *data = i2c_get_clientdata(client);
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;
char *fw_name;
int error;
const u8 *fw_signature;
static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
if (data->fw_validpage_count == 0)
return -EINVAL;
/* Look for a firmware with the product id appended. */
fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
if (!fw_name) {
dev_err(dev, "failed to allocate memory for firmware name\n");
return -ENOMEM;
}
dev_info(dev, "requesting fw '%s'\n", fw_name);
error = request_firmware(&fw, fw_name, dev);
kfree(fw_name);
if (error) {
dev_err(dev, "failed to request firmware: %d\n", error);
return error;
}
/* Firmware file must match signature data */
fw_signature = &fw->data[data->fw_signature_address];
if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
(int)sizeof(signature), signature,
(int)sizeof(signature), fw_signature);
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[ETP_CALIBRATE_MAX_LEN];
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 i2c_client *client = to_i2c_client(dev);
struct elan_tp_data *data = i2c_get_clientdata(client);
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 i2c_client *client = to_i2c_client(dev);
struct elan_tp_data *data = i2c_get_clientdata(client);
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 i2c_client *client = to_i2c_client(dev);
struct elan_tp_data *data = i2c_get_clientdata(client);
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, bool high_precision,
u8 *packet, u8 *finger_data)
{
struct input_dev *input = data->input;
unsigned int pos_x, pos_y;
unsigned int pressure, scaled_pressure;
if (contact_valid) {
if (high_precision) {
pos_x = get_unaligned_be16(&finger_data[0]);
pos_y = get_unaligned_be16(&finger_data[2]);
} else {
pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
}
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;
}
pressure = finger_data[4];
scaled_pressure = pressure + data->pressure_adjustment;
if (scaled_pressure > ETP_MAX_PRESSURE)
scaled_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, scaled_pressure);
if (data->report_features & ETP_FEATURE_REPORT_MK) {
unsigned int mk_x, mk_y, area_x, area_y;
u8 mk_data = high_precision ?
packet[ETP_MK_DATA_OFFSET + contact_num] :
finger_data[3];
mk_x = mk_data & 0x0f;
mk_y = mk_data >> 4;
/*
* 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);
input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
input_report_abs(input, ABS_MT_TOUCH_MAJOR,
max(area_x, area_y));
input_report_abs(input, ABS_MT_TOUCH_MINOR,
min(area_x, area_y));
}
} else {
input_mt_slot(input, contact_num);
input_mt_report_slot_inactive(input);
}
}
static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
bool high_precision)
{
struct input_dev *input = data->input;
u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
int i;
u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
bool contact_valid, hover_event;
pm_wakeup_event(&data->client->dev, 0);
hover_event = hover_info & BIT(6);
for (i = 0; i < ETP_MAX_FINGERS; i++) {
contact_valid = tp_info & BIT(3 + i);
elan_report_contact(data, i, contact_valid, high_precision,