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 				      const struct i2c_device_id *id)
33 {
34 	struct cyttsp *ts;
35 
36 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
37 		dev_err(&client->dev, "I2C functionality not Supported\n");
38 		return -EIO;
39 	}
40 
41 	ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
42 			  CY_I2C_DATA_SIZE);
43 
44 	if (IS_ERR(ts))
45 		return PTR_ERR(ts);
46 
47 	i2c_set_clientdata(client, ts);
48 	return 0;
49 }
50 
51 static const struct i2c_device_id cyttsp_i2c_id[] = {
52 	{ CY_I2C_NAME, 0 },
53 	{ }
54 };
55 MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
56 
57 static const struct of_device_id cyttsp_of_i2c_match[] = {
58 	{ .compatible = "cypress,cy8ctma340", },
59 	{ .compatible = "cypress,cy8ctst341", },
60 	{ /* sentinel */ }
61 };
62 MODULE_DEVICE_TABLE(of, cyttsp_of_i2c_match);
63 
64 static struct i2c_driver cyttsp_i2c_driver = {
65 	.driver = {
66 		.name	= CY_I2C_NAME,
67 		.pm	= &cyttsp_pm_ops,
68 		.of_match_table = cyttsp_of_i2c_match,
69 	},
70 	.probe		= cyttsp_i2c_probe,
71 	.id_table	= cyttsp_i2c_id,
72 };
73 
74 module_i2c_driver(cyttsp_i2c_driver);
75 
76 MODULE_LICENSE("GPL");
77 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
78 MODULE_AUTHOR("Cypress");
79