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_DATA_SIZE	128
22 
23 static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
24 	.bustype	= BUS_I2C,
25 	.write		= cyttsp_i2c_write_block_data,
26 	.read           = cyttsp_i2c_read_block_data,
27 };
28 
29 static int cyttsp_i2c_probe(struct i2c_client *client,
30 				      const struct i2c_device_id *id)
31 {
32 	struct cyttsp *ts;
33 
34 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
35 		dev_err(&client->dev, "I2C functionality not Supported\n");
36 		return -EIO;
37 	}
38 
39 	ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
40 			  CY_I2C_DATA_SIZE);
41 
42 	if (IS_ERR(ts))
43 		return PTR_ERR(ts);
44 
45 	i2c_set_clientdata(client, ts);
46 	return 0;
47 }
48 
49 static const struct i2c_device_id cyttsp_i2c_id[] = {
50 	{ CY_I2C_NAME, 0 },
51 	{ }
52 };
53 MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
54 
55 static struct i2c_driver cyttsp_i2c_driver = {
56 	.driver = {
57 		.name	= CY_I2C_NAME,
58 		.pm	= &cyttsp_pm_ops,
59 	},
60 	.probe		= cyttsp_i2c_probe,
61 	.id_table	= cyttsp_i2c_id,
62 };
63 
64 module_i2c_driver(cyttsp_i2c_driver);
65 
66 MODULE_LICENSE("GPL");
67 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
68 MODULE_AUTHOR("Cypress");
69