- 根目录:
- drivers
- input
- mouse
- elan_i2c_i2c.c
/*
* Elan I2C/SMBus Touchpad driver - I2C 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/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_PRESSURE_CMD 0x010A
#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);
if (ret != 1) {
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "writing cmd (0x%04x) failed: %d\n",
reg, ret);
return ret;
}
return 0;
}
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, 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];
*y_traces = val[1];
return 0;
}
static int elan_i2c_get_pressure_adjustment(struct i2c_client *client,
int *adjustment)
{
int error;
u8 val[3];
error = elan_i2c_read_cmd(client, ETP_I2C_PRESSURE_CMD, val);
if (error) {
dev_err(&client->dev, "failed to get pressure format: %d\n",
error);
return error;
}
if ((val[0] >> 4) & 0x1)
*adjustment = 0;
else
*adjustment = ETP_PRESSURE_OFFSET;
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_pressure_adjustment = elan_i2c_get_pressure_adjustment,
.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,
};