[deliverable/linux.git] / drivers / input / mouse / elan_i2c_smbus.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 [%*px]\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, 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]; /* XXX Why 0 and not 2 as in IAP/FW versions? */
	return 0;
}

static int elan_smbus_get_product_id(struct i2c_client *client, u8 *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 = val[1];
	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 error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val);
	if (error) {
		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 error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_RESOLUTION_CMD, val);
	if (error) {
		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 error;
	u8 val[3];

	error = i2c_smbus_read_block_data(client,
					  ETP_SMBUS_XY_TRACENUM_CMD, val);
	if (error) {
		dev_err(&client->dev, "failed to get trace info: %d\n", error);
		return error;
	}

	*x_traces = val[1] - 1;
	*y_traces = val[2] - 1;

	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;
}

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