drivers/input/touchscreen/gunze.c

   1 /*
   2  * $Id: gunze.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $
   3  *
   4  *  Copyright (c) 2000-2001 Vojtech Pavlik
   5  */
   6
   7 /*
   8  * Gunze AHL-51S touchscreen driver for Linux
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  * Should you need to contact me, the author, you can do so either by
  27  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  28  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  29  */
  30
  31 #include <linux/errno.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/input.h>
  36 #include <linux/serio.h>
  37 #include <linux/init.h>
  38
  39 #define DRIVER_DESC     "Gunze AHL-51S touchscreen driver"
  40
  41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  42 MODULE_DESCRIPTION(DRIVER_DESC);
  43 MODULE_LICENSE("GPL");
  44
  45 /*
  46  * Definitions & global arrays.
  47  */
  48
  49 #define GUNZE_MAX_LENGTH        10
  50
  51 /*
  52  * Per-touchscreen data.
  53  */
  54
  55 struct gunze {
  56         struct input_dev *dev;
  57         struct serio *serio;
  58         int idx;
  59         unsigned char data[GUNZE_MAX_LENGTH];
  60         char phys[32];
  61 };
  62
  63 static void gunze_process_packet(struct gunze* gunze)
  64 {
  65         struct input_dev *dev = gunze->dev;
  66
  67         if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
  68                 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
  69                 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
  70                 return;
  71         }
  72
  73         input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
  74         input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
  75         input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
  76         input_sync(dev);
  77 }
  78
  79 static irqreturn_t gunze_interrupt(struct serio *serio,
  80                 unsigned char data, unsigned int flags)
  81 {
  82         struct gunze* gunze = serio_get_drvdata(serio);
  83
  84         if (data == '\r') {
  85                 gunze_process_packet(gunze);
  86                 gunze->idx = 0;
  87         } else {
  88                 if (gunze->idx < GUNZE_MAX_LENGTH)
  89                         gunze->data[gunze->idx++] = data;
  90         }
  91         return IRQ_HANDLED;
  92 }
  93
  94 /*
  95  * gunze_disconnect() is the opposite of gunze_connect()
  96  */
  97
  98 static void gunze_disconnect(struct serio *serio)
  99 {
 100         struct gunze *gunze = serio_get_drvdata(serio);
 101
 102         input_get_device(gunze->dev);
 103         input_unregister_device(gunze->dev);
 104         serio_close(serio);
 105         serio_set_drvdata(serio, NULL);
 106         input_put_device(gunze->dev);
 107         kfree(gunze);
 108 }
 109
 110 /*
 111  * gunze_connect() is the routine that is called when someone adds a
 112  * new serio device that supports Gunze protocol and registers it as
 113  * an input device.
 114  */
 115
 116 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
 117 {
 118         struct gunze *gunze;
 119         struct input_dev *input_dev;
 120         int err;
 121
 122         gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
 123         input_dev = input_allocate_device();
 124         if (!gunze || !input_dev) {
 125                 err = -ENOMEM;
 126                 goto fail;
 127         }
 128
 129         gunze->serio = serio;
 130         gunze->dev = input_dev;
 131         snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
 132
 133         input_dev->private = gunze;
 134         input_dev->name = "Gunze AHL-51S TouchScreen";
 135         input_dev->phys = gunze->phys;
 136         input_dev->id.bustype = BUS_RS232;
 137         input_dev->id.vendor = SERIO_GUNZE;
 138         input_dev->id.product = 0x0051;
 139         input_dev->id.version = 0x0100;
 140         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 141         input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 142         input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
 143         input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
 144
 145         serio_set_drvdata(serio, gunze);
 146
 147         err = serio_open(serio, drv);
 148         if (err)
 149                 goto fail;
 150
 151         input_register_device(gunze->dev);
 152         return 0;
 153
 154  fail:  serio_set_drvdata(serio, NULL);
 155         input_free_device(input_dev);
 156         kfree(gunze);
 157         return err;
 158 }
 159
 160 /*
 161  * The serio driver structure.
 162  */
 163
 164 static struct serio_device_id gunze_serio_ids[] = {
 165         {
 166                 .type   = SERIO_RS232,
 167                 .proto  = SERIO_GUNZE,
 168                 .id     = SERIO_ANY,
 169                 .extra  = SERIO_ANY,
 170         },
 171         { 0 }
 172 };
 173
 174 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
 175
 176 static struct serio_driver gunze_drv = {
 177         .driver         = {
 178                 .name   = "gunze",
 179         },
 180         .description    = DRIVER_DESC,
 181         .id_table       = gunze_serio_ids,
 182         .interrupt      = gunze_interrupt,
 183         .connect        = gunze_connect,
 184         .disconnect     = gunze_disconnect,
 185 };
 186
 187 /*
 188  * The functions for inserting/removing us as a module.
 189  */
 190
 191 static int __init gunze_init(void)
 192 {
 193         serio_register_driver(&gunze_drv);
 194         return 0;
 195 }
 196
 197 static void __exit gunze_exit(void)
 198 {
 199         serio_unregister_driver(&gunze_drv);
 200 }
 201
 202 module_init(gunze_init);
 203 module_exit(gunze_exit);