drivers/input/touchscreen/dynapro.c

   1 /*
   2  * Dynapro serial touchscreen driver
   3  *
   4  * Copyright (c) 2009 Tias Guns
   5  * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
   6  * Richard Lemon
   7  *
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License version 2 as published by
  13  * the Free Software Foundation.
  14  */
  15
  16 /*
  17  * 2009/09/19 Tias Guns <tias@ulyssis.org>
  18  *   Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
  19  */
  20
  21 #include <linux/errno.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/input.h>
  26 #include <linux/serio.h>
  27 #include <linux/init.h>
  28
  29 #define DRIVER_DESC     "Dynapro serial touchscreen driver"
  30
  31 MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
  32 MODULE_DESCRIPTION(DRIVER_DESC);
  33 MODULE_LICENSE("GPL");
  34
  35 /*
  36  * Definitions & global arrays.
  37  */
  38
  39 #define DYNAPRO_FORMAT_TOUCH_BIT 0x40
  40 #define DYNAPRO_FORMAT_LENGTH 3
  41 #define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
  42
  43 #define DYNAPRO_MIN_XC 0
  44 #define DYNAPRO_MAX_XC 0x3ff
  45 #define DYNAPRO_MIN_YC 0
  46 #define DYNAPRO_MAX_YC 0x3ff
  47
  48 #define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
  49 #define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
  50 #define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
  51
  52 /*
  53  * Per-touchscreen data.
  54  */
  55
  56 struct dynapro {
  57         struct input_dev *dev;
  58         struct serio *serio;
  59         int idx;
  60         unsigned char data[DYNAPRO_FORMAT_LENGTH];
  61         char phys[32];
  62 };
  63
  64 static void dynapro_process_data(struct dynapro *pdynapro)
  65 {
  66         struct input_dev *dev = pdynapro->dev;
  67
  68         if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
  69                 input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
  70                 input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
  71                 input_report_key(dev, BTN_TOUCH,
  72                                  DYNAPRO_GET_TOUCHED(pdynapro->data));
  73                 input_sync(dev);
  74
  75                 pdynapro->idx = 0;
  76         }
  77 }
  78
  79 static irqreturn_t dynapro_interrupt(struct serio *serio,
  80                 unsigned char data, unsigned int flags)
  81 {
  82         struct dynapro *pdynapro = serio_get_drvdata(serio);
  83
  84         pdynapro->data[pdynapro->idx] = data;
  85
  86         if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
  87                 dynapro_process_data(pdynapro);
  88         else
  89                 dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
  90                         pdynapro->data[0]);
  91
  92         return IRQ_HANDLED;
  93 }
  94
  95 static void dynapro_disconnect(struct serio *serio)
  96 {
  97         struct dynapro *pdynapro = serio_get_drvdata(serio);
  98
  99         input_get_device(pdynapro->dev);
 100         input_unregister_device(pdynapro->dev);
 101         serio_close(serio);
 102         serio_set_drvdata(serio, NULL);
 103         input_put_device(pdynapro->dev);
 104         kfree(pdynapro);
 105 }
 106
 107 /*
 108  * dynapro_connect() is the routine that is called when someone adds a
 109  * new serio device that supports dynapro protocol and registers it as
 110  * an input device. This is usually accomplished using inputattach.
 111  */
 112
 113 static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
 114 {
 115         struct dynapro *pdynapro;
 116         struct input_dev *input_dev;
 117         int err;
 118
 119         pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
 120         input_dev = input_allocate_device();
 121         if (!pdynapro || !input_dev) {
 122                 err = -ENOMEM;
 123                 goto fail1;
 124         }
 125
 126         pdynapro->serio = serio;
 127         pdynapro->dev = input_dev;
 128         snprintf(pdynapro->phys, sizeof(pdynapro->phys),
 129                  "%s/input0", serio->phys);
 130
 131         input_dev->name = "Dynapro Serial TouchScreen";
 132         input_dev->phys = pdynapro->phys;
 133         input_dev->id.bustype = BUS_RS232;
 134         input_dev->id.vendor = SERIO_DYNAPRO;
 135         input_dev->id.product = 0;
 136         input_dev->id.version = 0x0001;
 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(pdynapro->dev, ABS_X,
 141                              DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
 142         input_set_abs_params(pdynapro->dev, ABS_Y,
 143                              DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
 144
 145         serio_set_drvdata(serio, pdynapro);
 146
 147         err = serio_open(serio, drv);
 148         if (err)
 149                 goto fail2;
 150
 151         err = input_register_device(pdynapro->dev);
 152         if (err)
 153                 goto fail3;
 154
 155         return 0;
 156
 157  fail3: serio_close(serio);
 158  fail2: serio_set_drvdata(serio, NULL);
 159  fail1: input_free_device(input_dev);
 160         kfree(pdynapro);
 161         return err;
 162 }
 163
 164 /*
 165  * The serio driver structure.
 166  */
 167
 168 static struct serio_device_id dynapro_serio_ids[] = {
 169         {
 170                 .type   = SERIO_RS232,
 171                 .proto  = SERIO_DYNAPRO,
 172                 .id     = SERIO_ANY,
 173                 .extra  = SERIO_ANY,
 174         },
 175         { 0 }
 176 };
 177
 178 MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
 179
 180 static struct serio_driver dynapro_drv = {
 181         .driver         = {
 182                 .name   = "dynapro",
 183         },
 184         .description    = DRIVER_DESC,
 185         .id_table       = dynapro_serio_ids,
 186         .interrupt      = dynapro_interrupt,
 187         .connect        = dynapro_connect,
 188         .disconnect     = dynapro_disconnect,
 189 };
 190
 191 module_serio_driver(dynapro_drv);