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, struct pt_regs *regs)
  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_regs(dev, regs);
  74         input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
  75         input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
  76         input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
  77         input_sync(dev);
  78 }
  79
  80 static irqreturn_t gunze_interrupt(struct serio *serio,
  81                 unsigned char data, unsigned int flags, struct pt_regs *regs)
  82 {
  83         struct gunze* gunze = serio_get_drvdata(serio);
  84
  85         if (data == '\r') {
  86                 gunze_process_packet(gunze, regs);
  87                 gunze->idx = 0;
  88         } else {
  89                 if (gunze->idx < GUNZE_MAX_LENGTH)
  90                         gunze->data[gunze->idx++] = data;
  91         }
  92         return IRQ_HANDLED;
  93 }
  94
  95 /*
  96  * gunze_disconnect() is the opposite of gunze_connect()
  97  */
  98
  99 static void gunze_disconnect(struct serio *serio)
 100 {
 101         struct gunze *gunze = serio_get_drvdata(serio);
 102
 103         input_get_device(gunze->dev);
 104         input_unregister_device(gunze->dev);
 105         serio_close(serio);
 106         serio_set_drvdata(serio, NULL);
 107         input_put_device(gunze->dev);
 108         kfree(gunze);
 109 }
 110
 111 /*
 112  * gunze_connect() is the routine that is called when someone adds a
 113  * new serio device that supports Gunze protocol and registers it as
 114  * an input device.
 115  */
 116
 117 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
 118 {
 119         struct gunze *gunze;
 120         struct input_dev *input_dev;
 121         int err;
 122
 123         gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
 124         input_dev = input_allocate_device();
 125         if (!gunze || !input_dev) {
 126                 err = -ENOMEM;
 127                 goto fail;
 128         }
 129
 130         gunze->serio = serio;
 131         gunze->dev = input_dev;
 132         snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
 133
 134         input_dev->private = gunze;
 135         input_dev->name = "Gunze AHL-51S TouchScreen";
 136         input_dev->phys = gunze->phys;
 137         input_dev->id.bustype = BUS_RS232;
 138         input_dev->id.vendor = SERIO_GUNZE;
 139         input_dev->id.product = 0x0051;
 140         input_dev->id.version = 0x0100;
 141         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 142         input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 143         input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
 144         input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
 145
 146         serio_set_drvdata(serio, gunze);
 147
 148         err = serio_open(serio, drv);
 149         if (err)
 150                 goto fail;
 151
 152         input_register_device(gunze->dev);
 153         return 0;
 154
 155  fail:  serio_set_drvdata(serio, NULL);
 156         input_free_device(input_dev);
 157         kfree(gunze);
 158         return err;
 159 }
 160
 161 /*
 162  * The serio driver structure.
 163  */
 164
 165 static 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
 175 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
 176
 177 static 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
 188 /*
 189  * The functions for inserting/removing us as a module.
 190  */
 191
 192 static int __init gunze_init(void)
 193 {
 194         serio_register_driver(&gunze_drv);
 195         return 0;
 196 }
 197
 198 static void __exit gunze_exit(void)
 199 {
 200         serio_unregister_driver(&gunze_drv);
 201 }
 202
 203 module_init(gunze_init);
 204 module_exit(gunze_exit);