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