LXR linux/drivers/input/touchscreen/dynapro.c

   1/*
   2 * Dynapro serial touchscreen driver
   3 *
   4 * Copyright (c) 2009 Tias Guns
   5 * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
   6 * Richard Lemon
   7 *
   8 */
   9
  10/*
  11 * This program is free software; you can redistribute it and/or modify it
  12 * under the terms of the GNU General Public License version 2 as published by
  13 * the Free Software Foundation.
  14 */
  15
  16/*
  17 * 2009/09/19 Tias Guns <tias@ulyssis.org>
  18 *   Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
  19 */
  20
  21#include <linux/errno.h>
  22#include <linux/kernel.h>
  23#include <linux/module.h>
  24#include <linux/slab.h>
  25#include <linux/input.h>
  26#include <linux/serio.h>
  27#include <linux/init.h>
  28
  29#define DRIVER_DESC     "Dynapro serial touchscreen driver"
  30
  31MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
  32MODULE_DESCRIPTION(DRIVER_DESC);
  33MODULE_LICENSE("GPL");
  34
  35/*
  36 * Definitions & global arrays.
  37 */
  38
  39#define DYNAPRO_FORMAT_TOUCH_BIT 0x40
  40#define DYNAPRO_FORMAT_LENGTH 3
  41#define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
  42
  43#define DYNAPRO_MIN_XC 0
  44#define DYNAPRO_MAX_XC 0x3ff
  45#define DYNAPRO_MIN_YC 0
  46#define DYNAPRO_MAX_YC 0x3ff
  47
  48#define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
  49#define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
  50#define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
  51
  52/*
  53 * Per-touchscreen data.
  54 */
  55
  56struct dynapro {
  57        struct input_dev *dev;
  58        struct serio *serio;
  59        int idx;
  60        unsigned char data[DYNAPRO_FORMAT_LENGTH];
  61        char phys[32];
  62};
  63
  64static void dynapro_process_data(struct dynapro *pdynapro)
  65{
  66        struct input_dev *dev = pdynapro->dev;
  67
  68        if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
  69                input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
  70                input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
  71                input_report_key(dev, BTN_TOUCH,
  72                                 DYNAPRO_GET_TOUCHED(pdynapro->data));
  73                input_sync(dev);
  74
  75                pdynapro->idx = 0;
  76        }
  77}
  78
  79static irqreturn_t dynapro_interrupt(struct serio *serio,
  80                unsigned char data, unsigned int flags)
  81{
  82        struct dynapro *pdynapro = serio_get_drvdata(serio);
  83
  84        pdynapro->data[pdynapro->idx] = data;
  85
  86        if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
  87                dynapro_process_data(pdynapro);
  88        else
  89                dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
  90                        pdynapro->data[0]);
  91
  92        return IRQ_HANDLED;
  93}
  94
  95static void dynapro_disconnect(struct serio *serio)
  96{
  97        struct dynapro *pdynapro = serio_get_drvdata(serio);
  98
  99        input_get_device(pdynapro->dev);
 100        input_unregister_device(pdynapro->dev);
 101        serio_close(serio);
 102        serio_set_drvdata(serio, NULL);
 103        input_put_device(pdynapro->dev);
 104        kfree(pdynapro);
 105}
 106
 107/*
 108 * dynapro_connect() is the routine that is called when someone adds a
 109 * new serio device that supports dynapro protocol and registers it as
 110 * an input device. This is usually accomplished using inputattach.
 111 */
 112
 113static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
 114{
 115        struct dynapro *pdynapro;
 116        struct input_dev *input_dev;
 117        int err;
 118
 119        pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
 120        input_dev = input_allocate_device();
 121        if (!pdynapro || !input_dev) {
 122                err = -ENOMEM;
 123                goto fail1;
 124        }
 125
 126        pdynapro->serio = serio;
 127        pdynapro->dev = input_dev;
 128        snprintf(pdynapro->phys, sizeof(pdynapro->phys),
 129                 "%s/input0", serio->phys);
 130
 131        input_dev->name = "Dynapro Serial TouchScreen";
 132        input_dev->phys = pdynapro->phys;
 133        input_dev->id.bustype = BUS_RS232;
 134        input_dev->id.vendor = SERIO_DYNAPRO;
 135        input_dev->id.product = 0;
 136        input_dev->id.version = 0x0001;
 137        input_dev->dev.parent = &serio->dev;
 138        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 139        input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 140        input_set_abs_params(pdynapro->dev, ABS_X,
 141                             DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
 142        input_set_abs_params(pdynapro->dev, ABS_Y,
 143                             DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
 144
 145        serio_set_drvdata(serio, pdynapro);
 146
 147        err = serio_open(serio, drv);
 148        if (err)
 149                goto fail2;
 150
 151        err = input_register_device(pdynapro->dev);
 152        if (err)
 153                goto fail3;
 154
 155        return 0;
 156
 157 fail3: serio_close(serio);
 158 fail2: serio_set_drvdata(serio, NULL);
 159 fail1: input_free_device(input_dev);
 160        kfree(pdynapro);
 161        return err;
 162}
 163
 164/*
 165 * The serio driver structure.
 166 */
 167
 168static struct serio_device_id dynapro_serio_ids[] = {
 169        {
 170                .type   = SERIO_RS232,
 171                .proto  = SERIO_DYNAPRO,
 172                .id     = SERIO_ANY,
 173                .extra  = SERIO_ANY,
 174        },
 175        { 0 }
 176};
 177
 178MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
 179
 180static struct serio_driver dynapro_drv = {
 181        .driver         = {
 182                .name   = "dynapro",
 183        },
 184        .description    = DRIVER_DESC,
 185        .id_table       = dynapro_serio_ids,
 186        .interrupt      = dynapro_interrupt,
 187        .connect        = dynapro_connect,
 188        .disconnect     = dynapro_disconnect,
 189};
 190
 191module_serio_driver(dynapro_drv);
 192