1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * cyttsp_i2c.c
4  * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
5  * For use with Cypress Txx3xx parts.
6  * Supported parts include:
7  * CY8CTST341
8  * CY8CTMA340
9  *
10  * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
11  * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
12  *
13  * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
14  */
15 
16 #include "cyttsp_core.h"
17 
18 #include <linux/i2c.h>
19 #include <linux/input.h>
20 
21 #define CY_I2C_NAME		"cyttsp-i2c"
22 
23 #define CY_I2C_DATA_SIZE	128
24 
25 static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
26 	.bustype	= BUS_I2C,
27 	.write		= cyttsp_i2c_write_block_data,
28 	.read           = cyttsp_i2c_read_block_data,
29 };
30 
31 static int cyttsp_i2c_probe(struct i2c_client *client)
32 {
33 	struct cyttsp *ts;
34 
35 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
36 		dev_err(&client->dev, "I2C functionality not Supported\n");
37 		return -EIO;
38 	}
39 
40 	ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
41 			  CY_I2C_DATA_SIZE);
42 
43 	if (IS_ERR(ts))
44 		return PTR_ERR(ts);
45 
46 	i2c_set_clientdata(client, ts);
47 	return 0;
48 }
49 
50 static const struct i2c_device_id cyttsp_i2c_id[] = {
51 	{ CY_I2C_NAME, 0 },
52 	{ }
53 };
54 MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
55 
56 static const struct of_device_id cyttsp_of_i2c_match[] = {
57 	{ .compatible = "cypress,cy8ctma340", },
58 	{ .compatible = "cypress,cy8ctst341", },
59 	{ /* sentinel */ }
60 };
61 MODULE_DEVICE_TABLE(of, cyttsp_of_i2c_match);
62 
63 static struct i2c_driver cyttsp_i2c_driver = {
64 	.driver = {
65 		.name	= CY_I2C_NAME,
66 		.pm	= &cyttsp_pm_ops,
67 		.of_match_table = cyttsp_of_i2c_match,
68 	},
69 	.probe_new	= cyttsp_i2c_probe,
70 	.id_table	= cyttsp_i2c_id,
71 };
72 
73 module_i2c_driver(cyttsp_i2c_driver);
74 
75 MODULE_LICENSE("GPL");
76 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
77 MODULE_AUTHOR("Cypress");
78