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

   1/*
   2 *  Copyright (c) 2000-2001 Vojtech Pavlik
   3 */
   4
   5/*
   6 * Gunze AHL-51S touchscreen driver for Linux
   7 */
   8
   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 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23 *
  24 * Should you need to contact me, the author, you can do so either by
  25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  27 */
  28
  29#include <linux/errno.h>
  30#include <linux/kernel.h>
  31#include <linux/module.h>
  32#include <linux/slab.h>
  33#include <linux/input.h>
  34#include <linux/serio.h>
  35
  36#define DRIVER_DESC     "Gunze AHL-51S touchscreen driver"
  37
  38MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  39MODULE_DESCRIPTION(DRIVER_DESC);
  40MODULE_LICENSE("GPL");
  41
  42/*
  43 * Definitions & global arrays.
  44 */
  45
  46#define GUNZE_MAX_LENGTH        10
  47
  48/*
  49 * Per-touchscreen data.
  50 */
  51
  52struct gunze {
  53        struct input_dev *dev;
  54        struct serio *serio;
  55        int idx;
  56        unsigned char data[GUNZE_MAX_LENGTH];
  57        char phys[32];
  58};
  59
  60static void gunze_process_packet(struct gunze* gunze)
  61{
  62        struct input_dev *dev = gunze->dev;
  63
  64        if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
  65                (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
  66                printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
  67                return;
  68        }
  69
  70        input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
  71        input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
  72        input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
  73        input_sync(dev);
  74}
  75
  76static irqreturn_t gunze_interrupt(struct serio *serio,
  77                unsigned char data, unsigned int flags)
  78{
  79        struct gunze* gunze = serio_get_drvdata(serio);
  80
  81        if (data == '\r') {
  82                gunze_process_packet(gunze);
  83                gunze->idx = 0;
  84        } else {
  85                if (gunze->idx < GUNZE_MAX_LENGTH)
  86                        gunze->data[gunze->idx++] = data;
  87        }
  88        return IRQ_HANDLED;
  89}
  90
  91/*
  92 * gunze_disconnect() is the opposite of gunze_connect()
  93 */
  94
  95static void gunze_disconnect(struct serio *serio)
  96{
  97        struct gunze *gunze = serio_get_drvdata(serio);
  98
  99        input_get_device(gunze->dev);
 100        input_unregister_device(gunze->dev);
 101        serio_close(serio);
 102        serio_set_drvdata(serio, NULL);
 103        input_put_device(gunze->dev);
 104        kfree(gunze);
 105}
 106
 107/*
 108 * gunze_connect() is the routine that is called when someone adds a
 109 * new serio device that supports Gunze protocol and registers it as
 110 * an input device.
 111 */
 112
 113static int gunze_connect(struct serio *serio, struct serio_driver *drv)
 114{
 115        struct gunze *gunze;
 116        struct input_dev *input_dev;
 117        int err;
 118
 119        gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
 120        input_dev = input_allocate_device();
 121        if (!gunze || !input_dev) {
 122                err = -ENOMEM;
 123                goto fail1;
 124        }
 125
 126        gunze->serio = serio;
 127        gunze->dev = input_dev;
 128        snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
 129
 130        input_dev->name = "Gunze AHL-51S TouchScreen";
 131        input_dev->phys = gunze->phys;
 132        input_dev->id.bustype = BUS_RS232;
 133        input_dev->id.vendor = SERIO_GUNZE;
 134        input_dev->id.product = 0x0051;
 135        input_dev->id.version = 0x0100;
 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(input_dev, ABS_X, 24, 1000, 0, 0);
 140        input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
 141
 142        serio_set_drvdata(serio, gunze);
 143
 144        err = serio_open(serio, drv);
 145        if (err)
 146                goto fail2;
 147
 148        err = input_register_device(gunze->dev);
 149        if (err)
 150                goto fail3;
 151
 152        return 0;
 153
 154 fail3: serio_close(serio);
 155 fail2: serio_set_drvdata(serio, NULL);
 156 fail1: input_free_device(input_dev);
 157        kfree(gunze);
 158        return err;
 159}
 160
 161/*
 162 * The serio driver structure.
 163 */
 164
 165static struct serio_device_id gunze_serio_ids[] = {
 166        {
 167                .type   = SERIO_RS232,
 168                .proto  = SERIO_GUNZE,
 169                .id     = SERIO_ANY,
 170                .extra  = SERIO_ANY,
 171        },
 172        { 0 }
 173};
 174
 175MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
 176
 177static struct serio_driver gunze_drv = {
 178        .driver         = {
 179                .name   = "gunze",
 180        },
 181        .description    = DRIVER_DESC,
 182        .id_table       = gunze_serio_ids,
 183        .interrupt      = gunze_interrupt,
 184        .connect        = gunze_connect,
 185        .disconnect     = gunze_disconnect,
 186};
 187
 188module_serio_driver(gunze_drv);
 189