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 #include <linux/init.h>
  36
  37 #define DRIVER_DESC     "Gunze AHL-51S touchscreen driver"
  38
  39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  40 MODULE_DESCRIPTION(DRIVER_DESC);
  41 MODULE_LICENSE("GPL");
  42
  43 /*
  44  * Definitions & global arrays.
  45  */
  46
  47 #define GUNZE_MAX_LENGTH        10
  48
  49 /*
  50  * Per-touchscreen data.
  51  */
  52
  53 struct gunze {
  54         struct input_dev *dev;
  55         struct serio *serio;
  56         int idx;
  57         unsigned char data[GUNZE_MAX_LENGTH];
  58         char phys[32];
  59 };
  60
  61 static void gunze_process_packet(struct gunze* gunze)
  62 {
  63         struct input_dev *dev = gunze->dev;
  64
  65         if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
  66                 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
  67                 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
  68                 return;
  69         }
  70
  71         input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
  72         input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
  73         input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
  74         input_sync(dev);
  75 }
  76
  77 static irqreturn_t gunze_interrupt(struct serio *serio,
  78                 unsigned char data, unsigned int flags)
  79 {
  80         struct gunze* gunze = serio_get_drvdata(serio);
  81
  82         if (data == '\r') {
  83                 gunze_process_packet(gunze);
  84                 gunze->idx = 0;
  85         } else {
  86                 if (gunze->idx < GUNZE_MAX_LENGTH)
  87                         gunze->data[gunze->idx++] = data;
  88         }
  89         return IRQ_HANDLED;
  90 }
  91
  92 /*
  93  * gunze_disconnect() is the opposite of gunze_connect()
  94  */
  95
  96 static void gunze_disconnect(struct serio *serio)
  97 {
  98         struct gunze *gunze = serio_get_drvdata(serio);
  99
 100         input_get_device(gunze->dev);
 101         input_unregister_device(gunze->dev);
 102         serio_close(serio);
 103         serio_set_drvdata(serio, NULL);
 104         input_put_device(gunze->dev);
 105         kfree(gunze);
 106 }
 107
 108 /*
 109  * gunze_connect() is the routine that is called when someone adds a
 110  * new serio device that supports Gunze protocol and registers it as
 111  * an input device.
 112  */
 113
 114 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
 115 {
 116         struct gunze *gunze;
 117         struct input_dev *input_dev;
 118         int err;
 119
 120         gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
 121         input_dev = input_allocate_device();
 122         if (!gunze || !input_dev) {
 123                 err = -ENOMEM;
 124                 goto fail1;
 125         }
 126
 127         gunze->serio = serio;
 128         gunze->dev = input_dev;
 129         snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
 130
 131         input_dev->name = "Gunze AHL-51S TouchScreen";
 132         input_dev->phys = gunze->phys;
 133         input_dev->id.bustype = BUS_RS232;
 134         input_dev->id.vendor = SERIO_GUNZE;
 135         input_dev->id.product = 0x0051;
 136         input_dev->id.version = 0x0100;
 137         input_dev->dev.parent = &serio->dev;
 138         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 139         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 140         input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
 141         input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
 142
 143         serio_set_drvdata(serio, gunze);
 144
 145         err = serio_open(serio, drv);
 146         if (err)
 147                 goto fail2;
 148
 149         err = input_register_device(gunze->dev);
 150         if (err)
 151                 goto fail3;
 152
 153         return 0;
 154
 155  fail3: serio_close(serio);
 156  fail2: serio_set_drvdata(serio, NULL);
 157  fail1: input_free_device(input_dev);
 158         kfree(gunze);
 159         return err;
 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         return serio_register_driver(&gunze_drv);
 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);