![João Paulo Rechi Vita](/assets/img/avatar_default.png)
This ACPI ID present in the DSDT of the ASUS E202SA laptop. Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
1205 lines
29 KiB
C
1205 lines
29 KiB
C
/*
|
|
* Elan I2C/SMBus Touchpad driver
|
|
*
|
|
* Copyright (c) 2013 ELAN Microelectronics Corp.
|
|
*
|
|
* Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
|
|
* Version: 1.6.0
|
|
*
|
|
* 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 "1.6.0"
|
|
#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_HOVER_INFO_OFFSET 30
|
|
#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;
|
|
int pressure_adjustment;
|
|
u8 mode;
|
|
u8 ic_type;
|
|
u16 fw_validpage_count;
|
|
u16 fw_signature_address;
|
|
|
|
bool irq_wake;
|
|
|
|
u8 min_baseline;
|
|
u8 max_baseline;
|
|
bool baseline_ready;
|
|
};
|
|
|
|
static int elan_get_fwinfo(u8 iap_version, u16 *validpage_count,
|
|
u16 *signature_address)
|
|
{
|
|
switch (iap_version) {
|
|
case 0x08:
|
|
*validpage_count = 512;
|
|
break;
|
|
case 0x09:
|
|
*validpage_count = 768;
|
|
break;
|
|
case 0x0D:
|
|
*validpage_count = 896;
|
|
break;
|
|
default:
|
|
/* unknown ic type clear value */
|
|
*validpage_count = 0;
|
|
*signature_address = 0;
|
|
return -ENXIO;
|
|
}
|
|
|
|
*signature_address =
|
|
(*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
|
|
dev_err(&data->client->dev, "failed to enable power: %d\n", error);
|
|
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);
|
|
|
|
dev_err(&data->client->dev, "failed to disable power: %d\n", 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_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;
|
|
|
|
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->ic_type,
|
|
&data->sm_version);
|
|
if (error)
|
|
return error;
|
|
|
|
error = data->ops->get_version(data->client, true, &data->iap_version);
|
|
if (error)
|
|
return error;
|
|
|
|
error = data->ops->get_pressure_adjustment(data->client,
|
|
&data->pressure_adjustment);
|
|
if (error)
|
|
return error;
|
|
|
|
error = elan_get_fwinfo(data->iap_version, &data->fw_validpage_count,
|
|
&data->fw_signature_address);
|
|
if (error) {
|
|
dev_err(&data->client->dev,
|
|
"unknown iap version %d\n", data->iap_version);
|
|
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 < data->fw_validpage_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 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};
|
|
|
|
/* 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[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 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,
|
|
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;
|
|
unsigned int scaled_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);
|
|
|
|
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);
|
|
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];
|
|
u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
|
|
bool contact_valid, hover_event;
|
|
|
|
hover_event = hover_info & 0x40;
|
|
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_report_abs(input, ABS_DISTANCE, hover_event != 0);
|
|
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);
|
|
input_set_abs_params(input, ABS_DISTANCE, 0, 1, 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;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
|
|
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);
|
|
|
|
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);
|
|
goto err;
|
|
}
|
|
|
|
error = elan_initialize(data);
|
|
if (error)
|
|
dev_err(dev, "initialize when resuming failed: %d\n", error);
|
|
|
|
err:
|
|
enable_irq(data->client->irq);
|
|
return error;
|
|
}
|
|
|
|
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 },
|
|
{ "ELAN0100", 0 },
|
|
{ "ELAN0600", 0 },
|
|
{ "ELAN1000", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
|
|
#endif
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id elan_of_match[] = {
|
|
{ .compatible = "elan,ekth3000" },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, elan_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver elan_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.pm = &elan_pm_ops,
|
|
.acpi_match_table = ACPI_PTR(elan_acpi_id),
|
|
.of_match_table = of_match_ptr(elan_of_match),
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
},
|
|
.probe = elan_probe,
|
|
.id_table = elan_id,
|
|
};
|
|
|
|
module_i2c_driver(elan_driver);
|
|
|
|
MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
|
|
MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(ELAN_DRIVER_VERSION);
|