1/*
 2 * cyttsp_i2c_common.c
 3 * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
 4 * For use with Cypress Txx3xx and Txx4xx parts.
 5 * Supported parts include:
 6 * CY8CTST341
 7 * CY8CTMA340
 8 * TMA4XX
 9 * TMA1036
10 *
11 * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
12 * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * version 2, and only version 2, as published by the
17 * Free Software Foundation.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22 * GNU General Public License for more details.
23 *
24 * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
25 *
26 */
27
28#include <linux/device.h>
29#include <linux/export.h>
30#include <linux/i2c.h>
31#include <linux/module.h>
32#include <linux/types.h>
33
34#include "cyttsp4_core.h"
35
36int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf,
37				      u16 addr, u8 length, void *values)
38{
39	struct i2c_client *client = to_i2c_client(dev);
40	u8 client_addr = client->addr | ((addr >> 8) & 0x1);
41	u8 addr_lo = addr & 0xFF;
42	struct i2c_msg msgs[] = {
43		{
44			.addr = client_addr,
45			.flags = 0,
46			.len = 1,
47			.buf = &addr_lo,
48		},
49		{
50			.addr = client_addr,
51			.flags = I2C_M_RD,
52			.len = length,
53			.buf = values,
54		},
55	};
56	int retval;
57
58	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
59	if (retval < 0)
60		return retval;
61
62	return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
63}
64EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data);
65
66int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf,
67				       u16 addr, u8 length, const void *values)
68{
69	struct i2c_client *client = to_i2c_client(dev);
70	u8 client_addr = client->addr | ((addr >> 8) & 0x1);
71	u8 addr_lo = addr & 0xFF;
72	struct i2c_msg msgs[] = {
73		{
74			.addr = client_addr,
75			.flags = 0,
76			.len = length + 1,
77			.buf = xfer_buf,
78		},
79	};
80	int retval;
81
82	xfer_buf[0] = addr_lo;
83	memcpy(&xfer_buf[1], values, length);
84
85	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
86	if (retval < 0)
87		return retval;
88
89	return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
90}
91EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data);
92
93
94MODULE_LICENSE("GPL");
95MODULE_AUTHOR("Cypress");

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * cyttsp_i2c_common.c
 4 * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
 5 * For use with Cypress Txx3xx and Txx4xx parts.
 6 * Supported parts include:
 7 * CY8CTST341
 8 * CY8CTMA340
 9 * TMA4XX
10 * TMA1036
11 *
12 * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
13 * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
14 *
 
 
 
 
 
 
 
 
 
 
15 * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
 
16 */
17
18#include <linux/device.h>
19#include <linux/export.h>
20#include <linux/i2c.h>
21#include <linux/module.h>
22#include <linux/types.h>
23
24#include "cyttsp4_core.h"
25
26int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf,
27				      u16 addr, u8 length, void *values)
28{
29	struct i2c_client *client = to_i2c_client(dev);
30	u8 client_addr = client->addr | ((addr >> 8) & 0x1);
31	u8 addr_lo = addr & 0xFF;
32	struct i2c_msg msgs[] = {
33		{
34			.addr = client_addr,
35			.flags = 0,
36			.len = 1,
37			.buf = &addr_lo,
38		},
39		{
40			.addr = client_addr,
41			.flags = I2C_M_RD,
42			.len = length,
43			.buf = values,
44		},
45	};
46	int retval;
47
48	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
49	if (retval < 0)
50		return retval;
51
52	return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
53}
54EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data);
55
56int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf,
57				       u16 addr, u8 length, const void *values)
58{
59	struct i2c_client *client = to_i2c_client(dev);
60	u8 client_addr = client->addr | ((addr >> 8) & 0x1);
61	u8 addr_lo = addr & 0xFF;
62	struct i2c_msg msgs[] = {
63		{
64			.addr = client_addr,
65			.flags = 0,
66			.len = length + 1,
67			.buf = xfer_buf,
68		},
69	};
70	int retval;
71
72	xfer_buf[0] = addr_lo;
73	memcpy(&xfer_buf[1], values, length);
74
75	retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
76	if (retval < 0)
77		return retval;
78
79	return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
80}
81EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data);
82
83
84MODULE_LICENSE("GPL");
85MODULE_AUTHOR("Cypress");