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

   1/*
   2 * Touchright serial touchscreen driver
   3 *
   4 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
   5 *
   6 * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
   7 * Copyright (c) 2004 Vojtech Pavlik
   8 * and Dan Streetman <ddstreet@ieee.org>
   9 */
  10
  11/*
  12 * This program is free software; you can redistribute it and/or modify it
  13 * under the terms of the GNU General Public License version 2 as published
  14 * by the Free Software Foundation.
  15 */
  16
  17#include <linux/errno.h>
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/slab.h>
  21#include <linux/input.h>
  22#include <linux/serio.h>
  23#include <linux/init.h>
  24
  25#define DRIVER_DESC     "Touchright serial touchscreen driver"
  26
  27MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
  28MODULE_DESCRIPTION(DRIVER_DESC);
  29MODULE_LICENSE("GPL");
  30
  31/*
  32 * Definitions & global arrays.
  33 */
  34
  35#define TR_FORMAT_TOUCH_BIT     0x01
  36#define TR_FORMAT_STATUS_BYTE   0x40
  37#define TR_FORMAT_STATUS_MASK   ~TR_FORMAT_TOUCH_BIT
  38
  39#define TR_LENGTH 5
  40
  41#define TR_MIN_XC 0
  42#define TR_MAX_XC 0x1ff
  43#define TR_MIN_YC 0
  44#define TR_MAX_YC 0x1ff
  45
  46/*
  47 * Per-touchscreen data.
  48 */
  49
  50struct tr {
  51        struct input_dev *dev;
  52        struct serio *serio;
  53        int idx;
  54        unsigned char data[TR_LENGTH];
  55        char phys[32];
  56};
  57
  58static irqreturn_t tr_interrupt(struct serio *serio,
  59                unsigned char data, unsigned int flags)
  60{
  61        struct tr *tr = serio_get_drvdata(serio);
  62        struct input_dev *dev = tr->dev;
  63
  64        tr->data[tr->idx] = data;
  65
  66        if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
  67                if (++tr->idx == TR_LENGTH) {
  68                        input_report_abs(dev, ABS_X,
  69                                (tr->data[1] << 5) | (tr->data[2] >> 1));
  70                        input_report_abs(dev, ABS_Y,
  71                                (tr->data[3] << 5) | (tr->data[4] >> 1));
  72                        input_report_key(dev, BTN_TOUCH,
  73                                tr->data[0] & TR_FORMAT_TOUCH_BIT);
  74                        input_sync(dev);
  75                        tr->idx = 0;
  76                }
  77        }
  78
  79        return IRQ_HANDLED;
  80}
  81
  82/*
  83 * tr_disconnect() is the opposite of tr_connect()
  84 */
  85
  86static void tr_disconnect(struct serio *serio)
  87{
  88        struct tr *tr = serio_get_drvdata(serio);
  89
  90        input_get_device(tr->dev);
  91        input_unregister_device(tr->dev);
  92        serio_close(serio);
  93        serio_set_drvdata(serio, NULL);
  94        input_put_device(tr->dev);
  95        kfree(tr);
  96}
  97
  98/*
  99 * tr_connect() is the routine that is called when someone adds a
 100 * new serio device that supports the Touchright protocol and registers it as
 101 * an input device.
 102 */
 103
 104static int tr_connect(struct serio *serio, struct serio_driver *drv)
 105{
 106        struct tr *tr;
 107        struct input_dev *input_dev;
 108        int err;
 109
 110        tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
 111        input_dev = input_allocate_device();
 112        if (!tr || !input_dev) {
 113                err = -ENOMEM;
 114                goto fail1;
 115        }
 116
 117        tr->serio = serio;
 118        tr->dev = input_dev;
 119        snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
 120
 121        input_dev->name = "Touchright Serial TouchScreen";
 122        input_dev->phys = tr->phys;
 123        input_dev->id.bustype = BUS_RS232;
 124        input_dev->id.vendor = SERIO_TOUCHRIGHT;
 125        input_dev->id.product = 0;
 126        input_dev->id.version = 0x0100;
 127        input_dev->dev.parent = &serio->dev;
 128        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 129        input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 130        input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
 131        input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
 132
 133        serio_set_drvdata(serio, tr);
 134
 135        err = serio_open(serio, drv);
 136        if (err)
 137                goto fail2;
 138
 139        err = input_register_device(tr->dev);
 140        if (err)
 141                goto fail3;
 142
 143        return 0;
 144
 145 fail3: serio_close(serio);
 146 fail2: serio_set_drvdata(serio, NULL);
 147 fail1: input_free_device(input_dev);
 148        kfree(tr);
 149        return err;
 150}
 151
 152/*
 153 * The serio driver structure.
 154 */
 155
 156static struct serio_device_id tr_serio_ids[] = {
 157        {
 158                .type   = SERIO_RS232,
 159                .proto  = SERIO_TOUCHRIGHT,
 160                .id     = SERIO_ANY,
 161                .extra  = SERIO_ANY,
 162        },
 163        { 0 }
 164};
 165
 166MODULE_DEVICE_TABLE(serio, tr_serio_ids);
 167
 168static struct serio_driver tr_drv = {
 169        .driver         = {
 170                .name   = "touchright",
 171        },
 172        .description    = DRIVER_DESC,
 173        .id_table       = tr_serio_ids,
 174        .interrupt      = tr_interrupt,
 175        .connect        = tr_connect,
 176        .disconnect     = tr_disconnect,
 177};
 178
 179/*
 180 * The functions for inserting/removing us as a module.
 181 */
 182
 183static int __init tr_init(void)
 184{
 185        return serio_register_driver(&tr_drv);
 186}
 187
 188static void __exit tr_exit(void)
 189{
 190        serio_unregister_driver(&tr_drv);
 191}
 192
 193module_init(tr_init);
 194module_exit(tr_exit);
 195