LXR linux/drivers/input/touchscreen/cyttsp

   1/*
   2 * Source for:
   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 * You should have received a copy of the GNU General Public License along
  23 * with this program; if not, write to the Free Software Foundation, Inc.,
  24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  25 *
  26 * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
  27 *
  28 */
  29
  30#include "cyttsp_core.h"
  31
  32#include <linux/i2c.h>
  33#include <linux/input.h>
  34
  35#define CY_I2C_DATA_SIZE        128
  36
  37static int cyttsp_i2c_read_block_data(struct cyttsp *ts,
  38                                      u8 addr, u8 length, void *values)
  39{
  40        struct i2c_client *client = to_i2c_client(ts->dev);
  41        struct i2c_msg msgs[] = {
  42                {
  43                        .addr = client->addr,
  44                        .flags = 0,
  45                        .len = 1,
  46                        .buf = &addr,
  47                },
  48                {
  49                        .addr = client->addr,
  50                        .flags = I2C_M_RD,
  51                        .len = length,
  52                        .buf = values,
  53                },
  54        };
  55        int retval;
  56
  57        retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
  58        if (retval < 0)
  59                return retval;
  60
  61        return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
  62}
  63
  64static int cyttsp_i2c_write_block_data(struct cyttsp *ts,
  65                                       u8 addr, u8 length, const void *values)
  66{
  67        struct i2c_client *client = to_i2c_client(ts->dev);
  68        int retval;
  69
  70        ts->xfer_buf[0] = addr;
  71        memcpy(&ts->xfer_buf[1], values, length);
  72
  73        retval = i2c_master_send(client, ts->xfer_buf, length + 1);
  74
  75        return retval < 0 ? retval : 0;
  76}
  77
  78static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
  79        .bustype        = BUS_I2C,
  80        .write          = cyttsp_i2c_write_block_data,
  81        .read           = cyttsp_i2c_read_block_data,
  82};
  83
  84static int cyttsp_i2c_probe(struct i2c_client *client,
  85                                      const struct i2c_device_id *id)
  86{
  87        struct cyttsp *ts;
  88
  89        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
  90                dev_err(&client->dev, "I2C functionality not Supported\n");
  91                return -EIO;
  92        }
  93
  94        ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
  95                          CY_I2C_DATA_SIZE);
  96
  97        if (IS_ERR(ts))
  98                return PTR_ERR(ts);
  99
 100        i2c_set_clientdata(client, ts);
 101
 102        return 0;
 103}
 104
 105static int cyttsp_i2c_remove(struct i2c_client *client)
 106{
 107        struct cyttsp *ts = i2c_get_clientdata(client);
 108
 109        cyttsp_remove(ts);
 110
 111        return 0;
 112}
 113
 114static const struct i2c_device_id cyttsp_i2c_id[] = {
 115        { CY_I2C_NAME, 0 },
 116        { }
 117};
 118MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
 119
 120static struct i2c_driver cyttsp_i2c_driver = {
 121        .driver = {
 122                .name   = CY_I2C_NAME,
 123                .owner  = THIS_MODULE,
 124                .pm     = &cyttsp_pm_ops,
 125        },
 126        .probe          = cyttsp_i2c_probe,
 127        .remove         = cyttsp_i2c_remove,
 128        .id_table       = cyttsp_i2c_id,
 129};
 130
 131module_i2c_driver(cyttsp_i2c_driver);
 132
 133MODULE_LICENSE("GPL");
 134MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
 135MODULE_AUTHOR("Cypress");
 136MODULE_ALIAS("i2c:cyttsp");
 137