drivers/input/touchscreen/tsc2005.c

   1 /*
   2  * TSC2005 touchscreen driver
   3  *
   4  * Copyright (C) 2006-2010 Nokia Corporation
   5  * Copyright (C) 2015 QWERTY Embedded Design
   6  * Copyright (C) 2015 EMAC Inc.
   7  *
   8  * Based on original tsc2005.c by Lauri Leukkunen <lauri.leukkunen@nokia.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/input.h>
  23 #include <linux/spi/spi.h>
  24 #include <linux/regmap.h>
  25 #include "tsc200x-core.h"
  26
  27 static const struct input_id tsc2005_input_id = {
  28         .bustype = BUS_SPI,
  29         .product = 2005,
  30 };
  31
  32 static int tsc2005_cmd(struct device *dev, u8 cmd)
  33 {
  34         u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
  35         struct spi_transfer xfer = {
  36                 .tx_buf         = &tx,
  37                 .len            = 1,
  38                 .bits_per_word  = 8,
  39         };
  40         struct spi_message msg;
  41         struct spi_device *spi = to_spi_device(dev);
  42         int error;
  43
  44         spi_message_init(&msg);
  45         spi_message_add_tail(&xfer, &msg);
  46
  47         error = spi_sync(spi, &msg);
  48         if (error) {
  49                 dev_err(dev, "%s: failed, command: %x, spi error: %d\n",
  50                         __func__, cmd, error);
  51                 return error;
  52         }
  53
  54         return 0;
  55 }
  56
  57 static int tsc2005_probe(struct spi_device *spi)
  58 {
  59         int error;
  60
  61         spi->mode = SPI_MODE_0;
  62         spi->bits_per_word = 8;
  63         if (!spi->max_speed_hz)
  64                 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
  65
  66         error = spi_setup(spi);
  67         if (error)
  68                 return error;
  69
  70         return tsc200x_probe(&spi->dev, spi->irq, &tsc2005_input_id,
  71                              devm_regmap_init_spi(spi, &tsc200x_regmap_config),
  72                              tsc2005_cmd);
  73 }
  74
  75 static int tsc2005_remove(struct spi_device *spi)
  76 {
  77         return tsc200x_remove(&spi->dev);
  78 }
  79
  80 static struct spi_driver tsc2005_driver = {
  81         .driver = {
  82                 .name   = "tsc2005",
  83                 .pm     = &tsc200x_pm_ops,
  84         },
  85         .probe  = tsc2005_probe,
  86         .remove = tsc2005_remove,
  87 };
  88 module_spi_driver(tsc2005_driver);
  89
  90 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
  91 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
  92 MODULE_LICENSE("GPL");
  93 MODULE_ALIAS("spi:tsc2005");