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
  24#define DRIVER_DESC     "Touchright serial touchscreen driver"
  25
  26MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
  27MODULE_DESCRIPTION(DRIVER_DESC);
  28MODULE_LICENSE("GPL");
  29
  30/*
  31 * Definitions & global arrays.
  32 */
  33
  34#define TR_FORMAT_TOUCH_BIT     0x01
  35#define TR_FORMAT_STATUS_BYTE   0x40
  36#define TR_FORMAT_STATUS_MASK   ~TR_FORMAT_TOUCH_BIT
  37
  38#define TR_LENGTH 5
  39
  40#define TR_MIN_XC 0
  41#define TR_MAX_XC 0x1ff
  42#define TR_MIN_YC 0
  43#define TR_MAX_YC 0x1ff
  44
  45/*
  46 * Per-touchscreen data.
  47 */
  48
  49struct tr {
  50        struct input_dev *dev;
  51        struct serio *serio;
  52        int idx;
  53        unsigned char data[TR_LENGTH];
  54        char phys[32];
  55};
  56
  57static irqreturn_t tr_interrupt(struct serio *serio,
  58                unsigned char data, unsigned int flags)
  59{
  60        struct tr *tr = serio_get_drvdata(serio);
  61        struct input_dev *dev = tr->dev;
  62
  63        tr->data[tr->idx] = data;
  64
  65        if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
  66                if (++tr->idx == TR_LENGTH) {
  67                        input_report_abs(dev, ABS_X,
  68                                (tr->data[1] << 5) | (tr->data[2] >> 1));
  69                        input_report_abs(dev, ABS_Y,
  70                                (tr->data[3] << 5) | (tr->data[4] >> 1));
  71                        input_report_key(dev, BTN_TOUCH,
  72                                tr->data[0] & TR_FORMAT_TOUCH_BIT);
  73                        input_sync(dev);
  74                        tr->idx = 0;
  75                }
  76        }
  77
  78        return IRQ_HANDLED;
  79}
  80
  81/*
  82 * tr_disconnect() is the opposite of tr_connect()
  83 */
  84
  85static void tr_disconnect(struct serio *serio)
  86{
  87        struct tr *tr = serio_get_drvdata(serio);
  88
  89        input_get_device(tr->dev);
  90        input_unregister_device(tr->dev);
  91        serio_close(serio);
  92        serio_set_drvdata(serio, NULL);
  93        input_put_device(tr->dev);
  94        kfree(tr);
  95}
  96
  97/*
  98 * tr_connect() is the routine that is called when someone adds a
  99 * new serio device that supports the Touchright protocol and registers it as
 100 * an input device.
 101 */
 102
 103static int tr_connect(struct serio *serio, struct serio_driver *drv)
 104{
 105        struct tr *tr;
 106        struct input_dev *input_dev;
 107        int err;
 108
 109        tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
 110        input_dev = input_allocate_device();
 111        if (!tr || !input_dev) {
 112                err = -ENOMEM;
 113                goto fail1;
 114        }
 115
 116        tr->serio = serio;
 117        tr->dev = input_dev;
 118        snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
 119
 120        input_dev->name = "Touchright Serial TouchScreen";
 121        input_dev->phys = tr->phys;
 122        input_dev->id.bustype = BUS_RS232;
 123        input_dev->id.vendor = SERIO_TOUCHRIGHT;
 124        input_dev->id.product = 0;
 125        input_dev->id.version = 0x0100;
 126        input_dev->dev.parent = &serio->dev;
 127        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 128        input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 129        input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
 130        input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
 131
 132        serio_set_drvdata(serio, tr);
 133
 134        err = serio_open(serio, drv);
 135        if (err)
 136                goto fail2;
 137
 138        err = input_register_device(tr->dev);
 139        if (err)
 140                goto fail3;
 141
 142        return 0;
 143
 144 fail3: serio_close(serio);
 145 fail2: serio_set_drvdata(serio, NULL);
 146 fail1: input_free_device(input_dev);
 147        kfree(tr);
 148        return err;
 149}
 150
 151/*
 152 * The serio driver structure.
 153 */
 154
 155static struct serio_device_id tr_serio_ids[] = {
 156        {
 157                .type   = SERIO_RS232,
 158                .proto  = SERIO_TOUCHRIGHT,
 159                .id     = SERIO_ANY,
 160                .extra  = SERIO_ANY,
 161        },
 162        { 0 }
 163};
 164
 165MODULE_DEVICE_TABLE(serio, tr_serio_ids);
 166
 167static struct serio_driver tr_drv = {
 168        .driver         = {
 169                .name   = "touchright",
 170        },
 171        .description    = DRIVER_DESC,
 172        .id_table       = tr_serio_ids,
 173        .interrupt      = tr_interrupt,
 174        .connect        = tr_connect,
 175        .disconnect     = tr_disconnect,
 176};
 177
 178module_serio_driver(tr_drv);
 179