[mirror_ubuntu-jammy-kernel.git] / drivers / input / mouse / elan_i2c_smbus.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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.
 *
 * 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[I2C_SMBUS_BLOCK_MAX] = {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;
	u8 buf[I2C_SMBUS_BLOCK_MAX] = {0};

	BUILD_BUG_ON(ETP_CALIBRATE_MAX_LEN > sizeof(buf));

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_CALIBRATE_QUERY, buf);
	if (error < 0)
		return error;

	memcpy(val, buf, ETP_CALIBRATE_MAX_LEN);
	return 0;
}

static int elan_smbus_get_baseline_data(struct i2c_client *client,
					bool max_baseline, u8 *value)
{
	int error;
	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};

	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[I2C_SMBUS_BLOCK_MAX] = {0};

	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,
				     u8 *clickpad)
{
	int error;
	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};

	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];
	*clickpad = val[0] & 0x10;
	return 0;
}

static int elan_smbus_get_product_id(struct i2c_client *client, u16 *id)
{
	int error;
	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};

	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[I2C_SMBUS_BLOCK_MAX] = {0};

	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[I2C_SMBUS_BLOCK_MAX] = {0};

	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[I2C_SMBUS_BLOCK_MAX] = {0};

	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[I2C_SMBUS_BLOCK_MAX] = {0};

	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[I2C_SMBUS_BLOCK_MAX] = {0};

	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[I2C_SMBUS_BLOCK_MAX] = {0};
	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 < (int)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[I2C_SMBUS_BLOCK_MAX] = {0};

	/*
	 * 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;

	BUILD_BUG_ON(I2C_SMBUS_BLOCK_MAX > ETP_SMBUS_REPORT_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,
};
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
6696777c DL	2	/*
	3	* Elan I2C/SMBus Touchpad driver - SMBus interface
	4	*
	5	* Copyright (c) 2013 ELAN Microelectronics Corp.
	6	*
	7	* Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
6696777c DL	8	*
	9	* Based on cyapa driver:
	10	* copyright (c) 2011-2012 Cypress Semiconductor, Inc.
	11	* copyright (c) 2011-2012 Google, Inc.
	12	*
6696777c DL	13	* Trademarks are the property of their respective owners.
	14	*/
	15
	16	#include <linux/delay.h>
	17	#include <linux/i2c.h>
	18	#include <linux/init.h>
	19	#include <linux/kernel.h>
	20
	21	#include "elan_i2c.h"
	22
	23	/* Elan SMbus commands */
	24	#define ETP_SMBUS_IAP_CMD 0x00
	25	#define ETP_SMBUS_ENABLE_TP 0x20
	26	#define ETP_SMBUS_SLEEP_CMD 0x21
	27	#define ETP_SMBUS_IAP_PASSWORD_WRITE 0x29
	28	#define ETP_SMBUS_IAP_PASSWORD_READ 0x80
	29	#define ETP_SMBUS_WRITE_FW_BLOCK 0x2A
	30	#define ETP_SMBUS_IAP_RESET_CMD 0x2B
	31	#define ETP_SMBUS_RANGE_CMD 0xA0
	32	#define ETP_SMBUS_FW_VERSION_CMD 0xA1
	33	#define ETP_SMBUS_XY_TRACENUM_CMD 0xA2
	34	#define ETP_SMBUS_SM_VERSION_CMD 0xA3
	35	#define ETP_SMBUS_UNIQUEID_CMD 0xA3
	36	#define ETP_SMBUS_RESOLUTION_CMD 0xA4
	37	#define ETP_SMBUS_HELLOPACKET_CMD 0xA7
	38	#define ETP_SMBUS_PACKET_QUERY 0xA8
	39	#define ETP_SMBUS_IAP_VERSION_CMD 0xAC
	40	#define ETP_SMBUS_IAP_CTRL_CMD 0xAD
	41	#define ETP_SMBUS_IAP_CHECKSUM_CMD 0xAE
	42	#define ETP_SMBUS_FW_CHECKSUM_CMD 0xAF
	43	#define ETP_SMBUS_MAX_BASELINE_CMD 0xC3
	44	#define ETP_SMBUS_MIN_BASELINE_CMD 0xC4
	45	#define ETP_SMBUS_CALIBRATE_QUERY 0xC5
	46
	47	#define ETP_SMBUS_REPORT_LEN 32
	48	#define ETP_SMBUS_REPORT_OFFSET 2
	49	#define ETP_SMBUS_HELLOPACKET_LEN 5
	50	#define ETP_SMBUS_IAP_PASSWORD 0x1234
	51	#define ETP_SMBUS_IAP_MODE_ON (1 << 6)
	52
	53	static int elan_smbus_initialize(struct i2c_client *client)
	54	{
	55	u8 check[ETP_SMBUS_HELLOPACKET_LEN] = { 0x55, 0x55, 0x55, 0x55, 0x55 };
50fc7b61	56	u8 values[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	57	int len, error;
	58
	59	/* Get hello packet */
	60	len = i2c_smbus_read_block_data(client,
	61	ETP_SMBUS_HELLOPACKET_CMD, values);
	62	if (len != ETP_SMBUS_HELLOPACKET_LEN) {
	63	dev_err(&client->dev, "hello packet length fail: %d\n", len);
	64	error = len < 0 ? len : -EIO;
	65	return error;
	66	}
	67
	68	/* compare hello packet */
	69	if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) {
98a4a59e	70	dev_err(&client->dev, "hello packet fail [%*ph]\n",
6696777c DL	71	ETP_SMBUS_HELLOPACKET_LEN, values);
	72	return -ENXIO;
	73	}
	74
	75	/* enable tp */
	76	error = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP);
	77	if (error) {
	78	dev_err(&client->dev, "failed to enable touchpad: %d\n", error);
	79	return error;
	80	}
	81
	82	return 0;
	83	}
	84
	85	static int elan_smbus_set_mode(struct i2c_client *client, u8 mode)
	86	{
	87	u8 cmd[4] = { 0x00, 0x07, 0x00, mode };
	88
	89	return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
	90	sizeof(cmd), cmd);
	91	}
	92
	93	static int elan_smbus_sleep_control(struct i2c_client *client, bool sleep)
	94	{
	95	if (sleep)
	96	return i2c_smbus_write_byte(client, ETP_SMBUS_SLEEP_CMD);
	97	else
	98	return 0; /* XXX should we send ETP_SMBUS_ENABLE_TP here? */
	99	}
	100
	101	static int elan_smbus_power_control(struct i2c_client *client, bool enable)
	102	{
	103	return 0; /* A no-op */
	104	}
	105
	106	static int elan_smbus_calibrate(struct i2c_client *client)
	107	{
	108	u8 cmd[4] = { 0x00, 0x08, 0x00, 0x01 };
	109
	110	return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
	111	sizeof(cmd), cmd);
	112	}
	113
	114	static int elan_smbus_calibrate_result(struct i2c_client client, u8 val)
	115	{
	116	int error;
50fc7b61 BH	117	u8 buf[I2C_SMBUS_BLOCK_MAX] = {0};
	118
	119	BUILD_BUG_ON(ETP_CALIBRATE_MAX_LEN > sizeof(buf));
6696777c DL	120
6696777c DL	121	error = i2c_smbus_read_block_data(client,
50fc7b61	122	ETP_SMBUS_CALIBRATE_QUERY, buf);
6696777c DL	123	if (error < 0)
	124	return error;
	125
50fc7b61	126	memcpy(val, buf, ETP_CALIBRATE_MAX_LEN);
6696777c DL	127	return 0;
	128	}
	129
	130	static int elan_smbus_get_baseline_data(struct i2c_client *client,
	131	bool max_baseline, u8 *value)
	132	{
	133	int error;
40f7090b	134	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	135
	136	error = i2c_smbus_read_block_data(client,
	137	max_baseline ?
	138	ETP_SMBUS_MAX_BASELINE_CMD :
	139	ETP_SMBUS_MIN_BASELINE_CMD,
	140	val);
	141	if (error < 0)
	142	return error;
	143
	144	value = be16_to_cpup((__be16 )val);
	145
	146	return 0;
	147	}
	148
	149	static int elan_smbus_get_version(struct i2c_client *client,
	150	bool iap, u8 *version)
	151	{
	152	int error;
40f7090b	153	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	154
	155	error = i2c_smbus_read_block_data(client,
	156	iap ? ETP_SMBUS_IAP_VERSION_CMD :
	157	ETP_SMBUS_FW_VERSION_CMD,
	158	val);
	159	if (error < 0) {
	160	dev_err(&client->dev, "failed to get %s version: %d\n",
	161	iap ? "IAP" : "FW", error);
	162	return error;
	163	}
	164
	165	*version = val[2];
	166	return 0;
	167	}
	168
12018ac3	169	static int elan_smbus_get_sm_version(struct i2c_client *client,
99136881 KL	170	u16 ic_type, u8 version,
99136881 KL	171	u8 *clickpad)
6696777c DL	172	{
6696777c DL	173	int error;
40f7090b	174	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	175
	176	error = i2c_smbus_read_block_data(client,
	177	ETP_SMBUS_SM_VERSION_CMD, val);
	178	if (error < 0) {
	179	dev_err(&client->dev, "failed to get SM version: %d\n", error);
	180	return error;
	181	}
	182
12018ac3 DL	183	*version = val[0];
12018ac3 DL	184	*ic_type = val[1];
99136881	185	*clickpad = val[0] & 0x10;
6696777c DL	186	return 0;
	187	}
	188
ed75a14e	189	static int elan_smbus_get_product_id(struct i2c_client client, u16 id)
6696777c DL	190	{
6696777c DL	191	int error;
40f7090b	192	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	193
	194	error = i2c_smbus_read_block_data(client,
	195	ETP_SMBUS_UNIQUEID_CMD, val);
	196	if (error < 0) {
	197	dev_err(&client->dev, "failed to get product ID: %d\n", error);
	198	return error;
	199	}
	200
ed75a14e	201	id = be16_to_cpup((__be16 )val);
6696777c DL	202	return 0;
	203	}
	204
	205	static int elan_smbus_get_checksum(struct i2c_client *client,
	206	bool iap, u16 *csum)
	207	{
	208	int error;
40f7090b	209	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	210
	211	error = i2c_smbus_read_block_data(client,
	212	iap ? ETP_SMBUS_FW_CHECKSUM_CMD :
	213	ETP_SMBUS_IAP_CHECKSUM_CMD,
	214	val);
	215	if (error < 0) {
	216	dev_err(&client->dev, "failed to get %s checksum: %d\n",
	217	iap ? "IAP" : "FW", error);
	218	return error;
	219	}
	220
	221	csum = be16_to_cpup((__be16 )val);
	222	return 0;
	223	}
	224
	225	static int elan_smbus_get_max(struct i2c_client *client,
	226	unsigned int max_x, unsigned int max_y)
	227	{
265d426d	228	int ret;
6696777c	229	int error;
40f7090b	230	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c	231
265d426d BT	232	ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val);
	233	if (ret != 3) {
	234	error = ret < 0 ? ret : -EIO;
6696777c DL	235	dev_err(&client->dev, "failed to get dimensions: %d\n", error);
	236	return error;
	237	}
	238
	239	*max_x = (0x0f & val[0]) << 8 \| val[1];
	240	*max_y = (0xf0 & val[0]) << 4 \| val[2];
	241
	242	return 0;
	243	}
	244
	245	static int elan_smbus_get_resolution(struct i2c_client *client,
	246	u8 hw_res_x, u8 hw_res_y)
	247	{
265d426d	248	int ret;
6696777c	249	int error;
40f7090b	250	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c	251
265d426d BT	252	ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RESOLUTION_CMD, val);
	253	if (ret != 3) {
	254	error = ret < 0 ? ret : -EIO;
6696777c DL	255	dev_err(&client->dev, "failed to get resolution: %d\n", error);
	256	return error;
	257	}
	258
	259	*hw_res_x = val[1] & 0x0F;
	260	*hw_res_y = (val[1] & 0xF0) >> 4;
	261
	262	return 0;
	263	}
	264
	265	static int elan_smbus_get_num_traces(struct i2c_client *client,
	266	unsigned int *x_traces,
	267	unsigned int *y_traces)
	268	{
265d426d	269	int ret;
6696777c	270	int error;
40f7090b	271	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c	272
265d426d BT	273	ret = i2c_smbus_read_block_data(client, ETP_SMBUS_XY_TRACENUM_CMD, val);
	274	if (ret != 3) {
	275	error = ret < 0 ? ret : -EIO;
6696777c DL	276	dev_err(&client->dev, "failed to get trace info: %d\n", error);
	277	return error;
	278	}
	279
9f423801 DL	280	*x_traces = val[1];
9f423801 DL	281	*y_traces = val[2];
6696777c DL	282
	283	return 0;
	284	}
	285
b9bced0e	286	static int elan_smbus_get_pressure_adjustment(struct i2c_client *client,
	287	int *adjustment)
	288	{
	289	*adjustment = ETP_PRESSURE_OFFSET;
	290	return 0;
	291	}
	292
6696777c DL	293	static int elan_smbus_iap_get_mode(struct i2c_client *client,
	294	enum tp_mode *mode)
	295	{
	296	int error;
	297	u16 constant;
40f7090b	298	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	299
	300	error = i2c_smbus_read_block_data(client, ETP_SMBUS_IAP_CTRL_CMD, val);
	301	if (error < 0) {
	302	dev_err(&client->dev, "failed to read iap ctrol register: %d\n",
	303	error);
	304	return error;
	305	}
	306
	307	constant = be16_to_cpup((__be16 *)val);
	308	dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
	309
	310	*mode = (constant & ETP_SMBUS_IAP_MODE_ON) ? IAP_MODE : MAIN_MODE;
	311
	312	return 0;
	313	}
	314
	315	static int elan_smbus_iap_reset(struct i2c_client *client)
	316	{
	317	int error;
	318
	319	error = i2c_smbus_write_byte(client, ETP_SMBUS_IAP_RESET_CMD);
	320	if (error) {
	321	dev_err(&client->dev, "cannot reset IC: %d\n", error);
	322	return error;
	323	}
	324
	325	return 0;
	326	}
	327
	328	static int elan_smbus_set_flash_key(struct i2c_client *client)
	329	{
	330	int error;
	331	u8 cmd[4] = { 0x00, 0x0B, 0x00, 0x5A };
	332
	333	error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
	334	sizeof(cmd), cmd);
	335	if (error) {
	336	dev_err(&client->dev, "cannot set flash key: %d\n", error);
	337	return error;
	338	}
	339
	340	return 0;
	341	}
	342
	343	static int elan_smbus_prepare_fw_update(struct i2c_client *client)
	344	{
	345	struct device *dev = &client->dev;
	346	int len;
	347	int error;
	348	enum tp_mode mode;
40f7090b	349	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	350	u8 cmd[4] = {0x0F, 0x78, 0x00, 0x06};
	351	u16 password;
	352
	353	/* Get FW in which mode (IAP_MODE/MAIN_MODE) */
	354	error = elan_smbus_iap_get_mode(client, &mode);
	355	if (error)
	356	return error;
	357
	358	if (mode == MAIN_MODE) {
	359
	360	/* set flash key */
	361	error = elan_smbus_set_flash_key(client);
	362	if (error)
	363	return error;
	364
	365	/* write iap password */
	366	if (i2c_smbus_write_byte(client,
	367	ETP_SMBUS_IAP_PASSWORD_WRITE) < 0) {
	368	dev_err(dev, "cannot write iap password\n");
	369	return -EIO;
	370	}
	371
	372	error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
	373	sizeof(cmd), cmd);
	374	if (error) {
	375	dev_err(dev, "failed to write iap password: %d\n",
	376	error);
	377	return error;
	378	}
	379
	380	/*
	381	* Read back password to make sure we enabled flash
	382	* successfully.
	383	*/
	384	len = i2c_smbus_read_block_data(client,
	385	ETP_SMBUS_IAP_PASSWORD_READ,
	386	val);
ce1d6f22	387	if (len < (int)sizeof(u16)) {
6696777c DL	388	error = len < 0 ? len : -EIO;
	389	dev_err(dev, "failed to read iap password: %d\n",
	390	error);
	391	return error;
	392	}
	393
	394	password = be16_to_cpup((__be16 *)val);
	395	if (password != ETP_SMBUS_IAP_PASSWORD) {
	396	dev_err(dev, "wrong iap password = 0x%X\n", password);
	397	return -EIO;
	398	}
	399
	400	/* Wait 30ms for MAIN_MODE change to IAP_MODE */
	401	msleep(30);
	402	}
	403
	404	error = elan_smbus_set_flash_key(client);
	405	if (error)
	406	return error;
	407
	408	/* Reset IC */
	409	error = elan_smbus_iap_reset(client);
	410	if (error)
	411	return error;
	412
	413	return 0;
	414	}
	415
	416
	417	static int elan_smbus_write_fw_block(struct i2c_client *client,
	418	const u8 *page, u16 checksum, int idx)
	419	{
	420	struct device *dev = &client->dev;
	421	int error;
	422	u16 result;
40f7090b	423	u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
6696777c DL	424
	425	/*
	426	* Due to the limitation of smbus protocol limiting
	427	* transfer to 32 bytes at a time, we must split block
	428	* in 2 transfers.
	429	*/
	430	error = i2c_smbus_write_block_data(client,
	431	ETP_SMBUS_WRITE_FW_BLOCK,
	432	ETP_FW_PAGE_SIZE / 2,
	433	page);
	434	if (error) {
	435	dev_err(dev, "Failed to write page %d (part %d): %d\n",
	436	idx, 1, error);
	437	return error;
	438	}
	439
	440	error = i2c_smbus_write_block_data(client,
	441	ETP_SMBUS_WRITE_FW_BLOCK,
	442	ETP_FW_PAGE_SIZE / 2,
	443	page + ETP_FW_PAGE_SIZE / 2);
	444	if (error) {
	445	dev_err(dev, "Failed to write page %d (part %d): %d\n",
	446	idx, 2, error);
	447	return error;
	448	}
	449
	450
	451	/* Wait for F/W to update one page ROM data. */
	452	usleep_range(8000, 10000);
	453
	454	error = i2c_smbus_read_block_data(client,
	455	ETP_SMBUS_IAP_CTRL_CMD, val);
	456	if (error < 0) {
	457	dev_err(dev, "Failed to read IAP write result: %d\n",
	458	error);
	459	return error;
	460	}
	461
	462	result = be16_to_cpup((__be16 *)val);
	463	if (result & (ETP_FW_IAP_PAGE_ERR \| ETP_FW_IAP_INTF_ERR)) {
	464	dev_err(dev, "IAP reports failed write: %04hx\n",
	465	result);
	466	return -EIO;
	467	}
	468
	469	return 0;
	470	}
	471
	472	static int elan_smbus_get_report(struct i2c_client client, u8 report)
	473	{
	474	int len;
	475
50fc7b61 BH	476	BUILD_BUG_ON(I2C_SMBUS_BLOCK_MAX > ETP_SMBUS_REPORT_LEN);
50fc7b61 BH	477
6696777c DL	478	len = i2c_smbus_read_block_data(client,
	479	ETP_SMBUS_PACKET_QUERY,
	480	&report[ETP_SMBUS_REPORT_OFFSET]);
	481	if (len < 0) {
	482	dev_err(&client->dev, "failed to read report data: %d\n", len);
	483	return len;
	484	}
	485
	486	if (len != ETP_SMBUS_REPORT_LEN) {
	487	dev_err(&client->dev,
	488	"wrong report length (%d vs %d expected)\n",
	489	len, ETP_SMBUS_REPORT_LEN);
	490	return -EIO;
	491	}
	492
	493	return 0;
	494	}
	495
	496	static int elan_smbus_finish_fw_update(struct i2c_client *client,
	497	struct completion *fw_completion)
	498	{
	499	/* No special handling unlike I2C transport */
	500	return 0;
	501	}
	502
a2eaf299 KL	503	static int elan_smbus_get_pattern(struct i2c_client client, u8 pattern)
	504	{
	505	*pattern = 0;
	506	return 0;
	507	}
	508
6696777c DL	509	const struct elan_transport_ops elan_smbus_ops = {
	510	.initialize = elan_smbus_initialize,
	511	.sleep_control = elan_smbus_sleep_control,
	512	.power_control = elan_smbus_power_control,
	513	.set_mode = elan_smbus_set_mode,
	514
	515	.calibrate = elan_smbus_calibrate,
	516	.calibrate_result = elan_smbus_calibrate_result,
	517
	518	.get_baseline_data = elan_smbus_get_baseline_data,
	519
	520	.get_version = elan_smbus_get_version,
	521	.get_sm_version = elan_smbus_get_sm_version,
	522	.get_product_id = elan_smbus_get_product_id,
	523	.get_checksum = elan_smbus_get_checksum,
b9bced0e	524	.get_pressure_adjustment = elan_smbus_get_pressure_adjustment,
6696777c DL	525
	526	.get_max = elan_smbus_get_max,
	527	.get_resolution = elan_smbus_get_resolution,
	528	.get_num_traces = elan_smbus_get_num_traces,
	529
	530	.iap_get_mode = elan_smbus_iap_get_mode,
	531	.iap_reset = elan_smbus_iap_reset,
	532
	533	.prepare_fw_update = elan_smbus_prepare_fw_update,
	534	.write_fw_block = elan_smbus_write_fw_block,
	535	.finish_fw_update = elan_smbus_finish_fw_update,
	536
	537	.get_report = elan_smbus_get_report,
a2eaf299	538	.get_pattern = elan_smbus_get_pattern,
6696777c	539	};