drivers/input/touchscreen/touchright.c

   1 /*
   2  * Touchright serial touchscreen driver
   3  *
   4  * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
   5  *
   6  * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
   7  * Copyright (c) 2004 Vojtech Pavlik
   8  * and Dan Streetman <ddstreet@ieee.org>
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License version 2 as published
  14  * by the Free Software Foundation.
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21 #include <linux/input.h>
  22 #include <linux/serio.h>
  23
  24 #define DRIVER_DESC     "Touchright serial touchscreen driver"
  25
  26 MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
  27 MODULE_DESCRIPTION(DRIVER_DESC);
  28 MODULE_LICENSE("GPL");
  29
  30 /*
  31  * Definitions & global arrays.
  32  */
  33
  34 #define TR_FORMAT_TOUCH_BIT     0x01
  35 #define TR_FORMAT_STATUS_BYTE   0x40
  36 #define TR_FORMAT_STATUS_MASK   ~TR_FORMAT_TOUCH_BIT
  37
  38 #define TR_LENGTH 5
  39
  40 #define TR_MIN_XC 0
  41 #define TR_MAX_XC 0x1ff
  42 #define TR_MIN_YC 0
  43 #define TR_MAX_YC 0x1ff
  44
  45 /*
  46  * Per-touchscreen data.
  47  */
  48
  49 struct tr {
  50         struct input_dev *dev;
  51         struct serio *serio;
  52         int idx;
  53         unsigned char data[TR_LENGTH];
  54         char phys[32];
  55 };
  56
  57 static irqreturn_t tr_interrupt(struct serio *serio,
  58                 unsigned char data, unsigned int flags)
  59 {
  60         struct tr *tr = serio_get_drvdata(serio);
  61         struct input_dev *dev = tr->dev;
  62
  63         tr->data[tr->idx] = data;
  64
  65         if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
  66                 if (++tr->idx == TR_LENGTH) {
  67                         input_report_abs(dev, ABS_X,
  68                                 (tr->data[1] << 5) | (tr->data[2] >> 1));
  69                         input_report_abs(dev, ABS_Y,
  70                                 (tr->data[3] << 5) | (tr->data[4] >> 1));
  71                         input_report_key(dev, BTN_TOUCH,
  72                                 tr->data[0] & TR_FORMAT_TOUCH_BIT);
  73                         input_sync(dev);
  74                         tr->idx = 0;
  75                 }
  76         }
  77
  78         return IRQ_HANDLED;
  79 }
  80
  81 /*
  82  * tr_disconnect() is the opposite of tr_connect()
  83  */
  84
  85 static void tr_disconnect(struct serio *serio)
  86 {
  87         struct tr *tr = serio_get_drvdata(serio);
  88
  89         input_get_device(tr->dev);
  90         input_unregister_device(tr->dev);
  91         serio_close(serio);
  92         serio_set_drvdata(serio, NULL);
  93         input_put_device(tr->dev);
  94         kfree(tr);
  95 }
  96
  97 /*
  98  * tr_connect() is the routine that is called when someone adds a
  99  * new serio device that supports the Touchright protocol and registers it as
 100  * an input device.
 101  */
 102
 103 static int tr_connect(struct serio *serio, struct serio_driver *drv)
 104 {
 105         struct tr *tr;
 106         struct input_dev *input_dev;
 107         int err;
 108
 109         tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
 110         input_dev = input_allocate_device();
 111         if (!tr || !input_dev) {
 112                 err = -ENOMEM;
 113                 goto fail1;
 114         }
 115
 116         tr->serio = serio;
 117         tr->dev = input_dev;
 118         snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
 119
 120         input_dev->name = "Touchright Serial TouchScreen";
 121         input_dev->phys = tr->phys;
 122         input_dev->id.bustype = BUS_RS232;
 123         input_dev->id.vendor = SERIO_TOUCHRIGHT;
 124         input_dev->id.product = 0;
 125         input_dev->id.version = 0x0100;
 126         input_dev->dev.parent = &serio->dev;
 127         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 128         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 129         input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
 130         input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
 131
 132         serio_set_drvdata(serio, tr);
 133
 134         err = serio_open(serio, drv);
 135         if (err)
 136                 goto fail2;
 137
 138         err = input_register_device(tr->dev);
 139         if (err)
 140                 goto fail3;
 141
 142         return 0;
 143
 144  fail3: serio_close(serio);
 145  fail2: serio_set_drvdata(serio, NULL);
 146  fail1: input_free_device(input_dev);
 147         kfree(tr);
 148         return err;
 149 }
 150
 151 /*
 152  * The serio driver structure.
 153  */
 154
 155 static struct serio_device_id tr_serio_ids[] = {
 156         {
 157                 .type   = SERIO_RS232,
 158                 .proto  = SERIO_TOUCHRIGHT,
 159                 .id     = SERIO_ANY,
 160                 .extra  = SERIO_ANY,
 161         },
 162         { 0 }
 163 };
 164
 165 MODULE_DEVICE_TABLE(serio, tr_serio_ids);
 166
 167 static struct serio_driver tr_drv = {
 168         .driver         = {
 169                 .name   = "touchright",
 170         },
 171         .description    = DRIVER_DESC,
 172         .id_table       = tr_serio_ids,
 173         .interrupt      = tr_interrupt,
 174         .connect        = tr_connect,
 175         .disconnect     = tr_disconnect,
 176 };
 177
 178 module_serio_driver(tr_drv);