drivers/input/touchscreen/cyttsp_i2c.c

   1 /*
   2  * cyttsp_i2c.c
   3  * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
   4  * For use with Cypress Txx3xx parts.
   5  * Supported parts include:
   6  * CY8CTST341
   7  * CY8CTMA340
   8  *
   9  * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
  10  * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * version 2, and only version 2, as published by the
  15  * Free Software Foundation.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
  23  *
  24  */
  25
  26 #include "cyttsp_core.h"
  27
  28 #include <linux/i2c.h>
  29 #include <linux/input.h>
  30
  31 #define CY_I2C_DATA_SIZE        128
  32
  33 static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
  34         .bustype        = BUS_I2C,
  35         .write          = cyttsp_i2c_write_block_data,
  36         .read           = cyttsp_i2c_read_block_data,
  37 };
  38
  39 static int cyttsp_i2c_probe(struct i2c_client *client,
  40                                       const struct i2c_device_id *id)
  41 {
  42         struct cyttsp *ts;
  43
  44         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
  45                 dev_err(&client->dev, "I2C functionality not Supported\n");
  46                 return -EIO;
  47         }
  48
  49         ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
  50                           CY_I2C_DATA_SIZE);
  51
  52         if (IS_ERR(ts))
  53                 return PTR_ERR(ts);
  54
  55         i2c_set_clientdata(client, ts);
  56         return 0;
  57 }
  58
  59 static int cyttsp_i2c_remove(struct i2c_client *client)
  60 {
  61         struct cyttsp *ts = i2c_get_clientdata(client);
  62
  63         cyttsp_remove(ts);
  64
  65         return 0;
  66 }
  67
  68 static const struct i2c_device_id cyttsp_i2c_id[] = {
  69         { CY_I2C_NAME, 0 },
  70         { }
  71 };
  72 MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
  73
  74 static struct i2c_driver cyttsp_i2c_driver = {
  75         .driver = {
  76                 .name   = CY_I2C_NAME,
  77                 .owner  = THIS_MODULE,
  78                 .pm     = &cyttsp_pm_ops,
  79         },
  80         .probe          = cyttsp_i2c_probe,
  81         .remove         = cyttsp_i2c_remove,
  82         .id_table       = cyttsp_i2c_id,
  83 };
  84
  85 module_i2c_driver(cyttsp_i2c_driver);
  86
  87 MODULE_LICENSE("GPL");
  88 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
  89 MODULE_AUTHOR("Cypress");
  90 MODULE_ALIAS("i2c:cyttsp");