drivers/input/touchscreen/cyttsp_i2c.c

   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");