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