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