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 static char *gunze_name = "Gunze AHL-51S TouchScreen";
  52
  53 /*
  54  * Per-touchscreen data.
  55  */
  56
  57 struct gunze {
  58         struct input_dev dev;
  59         struct serio *serio;
  60         int idx;
  61         unsigned char data[GUNZE_MAX_LENGTH];
  62         char phys[32];
  63 };
  64
  65 static void gunze_process_packet(struct gunze* gunze, struct pt_regs *regs)
  66 {
  67         struct input_dev *dev = &gunze->dev;
  68
  69         if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
  70                 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
  71                 gunze->data[10] = 0;
  72                 printk(KERN_WARNING "gunze.c: bad packet: >%s<\n", gunze->data);
  73                 return;
  74         }
  75
  76         input_regs(dev, regs);
  77         input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
  78         input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
  79         input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
  80         input_sync(dev);
  81 }
  82
  83 static irqreturn_t gunze_interrupt(struct serio *serio,
  84                 unsigned char data, unsigned int flags, struct pt_regs *regs)
  85 {
  86         struct gunze* gunze = serio_get_drvdata(serio);
  87
  88         if (data == '\r') {
  89                 gunze_process_packet(gunze, regs);
  90                 gunze->idx = 0;
  91         } else {
  92                 if (gunze->idx < GUNZE_MAX_LENGTH)
  93                         gunze->data[gunze->idx++] = data;
  94         }
  95         return IRQ_HANDLED;
  96 }
  97
  98 /*
  99  * gunze_disconnect() is the opposite of gunze_connect()
 100  */
 101
 102 static void gunze_disconnect(struct serio *serio)
 103 {
 104         struct gunze* gunze = serio_get_drvdata(serio);
 105
 106         input_unregister_device(&gunze->dev);
 107         serio_close(serio);
 108         serio_set_drvdata(serio, NULL);
 109         kfree(gunze);
 110 }
 111
 112 /*
 113  * gunze_connect() is the routine that is called when someone adds a
 114  * new serio device that supports Gunze protocol and registers it as
 115  * an input device.
 116  */
 117
 118 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
 119 {
 120         struct gunze *gunze;
 121         int err;
 122
 123         if (!(gunze = kmalloc(sizeof(struct gunze), GFP_KERNEL)))
 124                 return -ENOMEM;
 125
 126         memset(gunze, 0, sizeof(struct gunze));
 127
 128         init_input_dev(&gunze->dev);
 129         gunze->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 130         gunze->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 131         input_set_abs_params(&gunze->dev, ABS_X, 24, 1000, 0, 0);
 132         input_set_abs_params(&gunze->dev, ABS_Y, 24, 1000, 0, 0);
 133
 134         gunze->serio = serio;
 135
 136         sprintf(gunze->phys, "%s/input0", serio->phys);
 137
 138         gunze->dev.private = gunze;
 139         gunze->dev.name = gunze_name;
 140         gunze->dev.phys = gunze->phys;
 141         gunze->dev.id.bustype = BUS_RS232;
 142         gunze->dev.id.vendor = SERIO_GUNZE;
 143         gunze->dev.id.product = 0x0051;
 144         gunze->dev.id.version = 0x0100;
 145
 146         serio_set_drvdata(serio, gunze);
 147
 148         err = serio_open(serio, drv);
 149         if (err) {
 150                 serio_set_drvdata(serio, NULL);
 151                 kfree(gunze);
 152                 return err;
 153         }
 154
 155         input_register_device(&gunze->dev);
 156
 157         printk(KERN_INFO "input: %s on %s\n", gunze_name, serio->phys);
 158
 159         return 0;
 160 }
 161
 162 /*
 163  * The serio driver structure.
 164  */
 165
 166 static struct serio_device_id gunze_serio_ids[] = {
 167         {
 168                 .type   = SERIO_RS232,
 169                 .proto  = SERIO_GUNZE,
 170                 .id     = SERIO_ANY,
 171                 .extra  = SERIO_ANY,
 172         },
 173         { 0 }
 174 };
 175
 176 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
 177
 178 static struct serio_driver gunze_drv = {
 179         .driver         = {
 180                 .name   = "gunze",
 181         },
 182         .description    = DRIVER_DESC,
 183         .id_table       = gunze_serio_ids,
 184         .interrupt      = gunze_interrupt,
 185         .connect        = gunze_connect,
 186         .disconnect     = gunze_disconnect,
 187 };
 188
 189 /*
 190  * The functions for inserting/removing us as a module.
 191  */
 192
 193 static int __init gunze_init(void)
 194 {
 195         serio_register_driver(&gunze_drv);
 196         return 0;
 197 }
 198
 199 static void __exit gunze_exit(void)
 200 {
 201         serio_unregister_driver(&gunze_drv);
 202 }
 203
 204 module_init(gunze_init);
 205 module_exit(gunze_exit);