mirror of https://gitee.com/openkylin/linux.git
535 lines
12 KiB
C
535 lines
12 KiB
C
/*
|
|
* Elan I2C/SMBus Touchpad driver - SMBus interface
|
|
*
|
|
* Copyright (c) 2013 ELAN Microelectronics Corp.
|
|
*
|
|
* Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
|
|
*
|
|
* 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 [%*ph]\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,
|
|
u16 *ic_type, 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];
|
|
*ic_type = val[1];
|
|
return 0;
|
|
}
|
|
|
|
static int elan_smbus_get_product_id(struct i2c_client *client, u16 *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 = be16_to_cpup((__be16 *)val);
|
|
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 ret;
|
|
int error;
|
|
u8 val[3];
|
|
|
|
ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val);
|
|
if (ret != 3) {
|
|
error = ret < 0 ? ret : -EIO;
|
|
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 ret;
|
|
int error;
|
|
u8 val[3];
|
|
|
|
ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RESOLUTION_CMD, val);
|
|
if (ret != 3) {
|
|
error = ret < 0 ? ret : -EIO;
|
|
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 ret;
|
|
int error;
|
|
u8 val[3];
|
|
|
|
ret = i2c_smbus_read_block_data(client, ETP_SMBUS_XY_TRACENUM_CMD, val);
|
|
if (ret != 3) {
|
|
error = ret < 0 ? ret : -EIO;
|
|
dev_err(&client->dev, "failed to get trace info: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
*x_traces = val[1];
|
|
*y_traces = val[2];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int elan_smbus_get_pressure_adjustment(struct i2c_client *client,
|
|
int *adjustment)
|
|
{
|
|
*adjustment = ETP_PRESSURE_OFFSET;
|
|
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(u16)) {
|
|
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;
|
|
}
|
|
|
|
static int elan_smbus_get_pattern(struct i2c_client *client, u8 *pattern)
|
|
{
|
|
*pattern = 0;
|
|
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_pressure_adjustment = elan_smbus_get_pressure_adjustment,
|
|
|
|
.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,
|
|
.get_pattern = elan_smbus_get_pattern,
|
|
};
|