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
  25 #include <linux/errno.h>
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29 #include <linux/input.h>
  30 #include <linux/serio.h>
  31
  32 #define DRIVER_DESC     "Gunze AHL-51S touchscreen driver"
  33
  34 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  35 MODULE_DESCRIPTION(DRIVER_DESC);
  36 MODULE_LICENSE("GPL");
  37
  38 /*
  39  * Definitions & global arrays.
  40  */
  41
  42 #define GUNZE_MAX_LENGTH        10
  43
  44 /*
  45  * Per-touchscreen data.
  46  */
  47
  48 struct gunze {
  49         struct input_dev *dev;
  50         struct serio *serio;
  51         int idx;
  52         unsigned char data[GUNZE_MAX_LENGTH];
  53         char phys[32];
  54 };
  55
  56 static void gunze_process_packet(struct gunze *gunze)
  57 {
  58         struct input_dev *dev = gunze->dev;
  59
  60         if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
  61                 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
  62                 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
  63                 return;
  64         }
  65
  66         input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
  67         input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
  68         input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
  69         input_sync(dev);
  70 }
  71
  72 static irqreturn_t gunze_interrupt(struct serio *serio,
  73                 unsigned char data, unsigned int flags)
  74 {
  75         struct gunze *gunze = serio_get_drvdata(serio);
  76
  77         if (data == '\r') {
  78                 gunze_process_packet(gunze);
  79                 gunze->idx = 0;
  80         } else {
  81                 if (gunze->idx < GUNZE_MAX_LENGTH)
  82                         gunze->data[gunze->idx++] = data;
  83         }
  84         return IRQ_HANDLED;
  85 }
  86
  87 /*
  88  * gunze_disconnect() is the opposite of gunze_connect()
  89  */
  90
  91 static void gunze_disconnect(struct serio *serio)
  92 {
  93         struct gunze *gunze = serio_get_drvdata(serio);
  94
  95         input_get_device(gunze->dev);
  96         input_unregister_device(gunze->dev);
  97         serio_close(serio);
  98         serio_set_drvdata(serio, NULL);
  99         input_put_device(gunze->dev);
 100         kfree(gunze);
 101 }
 102
 103 /*
 104  * gunze_connect() is the routine that is called when someone adds a
 105  * new serio device that supports Gunze protocol and registers it as
 106  * an input device.
 107  */
 108
 109 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
 110 {
 111         struct gunze *gunze;
 112         struct input_dev *input_dev;
 113         int err;
 114
 115         gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
 116         input_dev = input_allocate_device();
 117         if (!gunze || !input_dev) {
 118                 err = -ENOMEM;
 119                 goto fail1;
 120         }
 121
 122         gunze->serio = serio;
 123         gunze->dev = input_dev;
 124         snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
 125
 126         input_dev->name = "Gunze AHL-51S TouchScreen";
 127         input_dev->phys = gunze->phys;
 128         input_dev->id.bustype = BUS_RS232;
 129         input_dev->id.vendor = SERIO_GUNZE;
 130         input_dev->id.product = 0x0051;
 131         input_dev->id.version = 0x0100;
 132         input_dev->dev.parent = &serio->dev;
 133         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 134         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 135         input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
 136         input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
 137
 138         serio_set_drvdata(serio, gunze);
 139
 140         err = serio_open(serio, drv);
 141         if (err)
 142                 goto fail2;
 143
 144         err = input_register_device(gunze->dev);
 145         if (err)
 146                 goto fail3;
 147
 148         return 0;
 149
 150  fail3: serio_close(serio);
 151  fail2: serio_set_drvdata(serio, NULL);
 152  fail1: input_free_device(input_dev);
 153         kfree(gunze);
 154         return err;
 155 }
 156
 157 /*
 158  * The serio driver structure.
 159  */
 160
 161 static const struct serio_device_id gunze_serio_ids[] = {
 162         {
 163                 .type   = SERIO_RS232,
 164                 .proto  = SERIO_GUNZE,
 165                 .id     = SERIO_ANY,
 166                 .extra  = SERIO_ANY,
 167         },
 168         { 0 }
 169 };
 170
 171 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
 172
 173 static struct serio_driver gunze_drv = {
 174         .driver         = {
 175                 .name   = "gunze",
 176         },
 177         .description    = DRIVER_DESC,
 178         .id_table       = gunze_serio_ids,
 179         .interrupt      = gunze_interrupt,
 180         .connect        = gunze_connect,
 181         .disconnect     = gunze_disconnect,
 182 };
 183
 184 module_serio_driver(gunze_drv);