drivers/input/touchscreen/dynapro.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Dynapro serial touchscreen driver
   4  *
   5  * Copyright (c) 2009 Tias Guns
   6  * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
   7  * Richard Lemon
   8  */
   9
  10
  11 /*
  12  * 2009/09/19 Tias Guns <tias@ulyssis.org>
  13  *   Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
  14  */
  15
  16 #include <linux/errno.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/input.h>
  21 #include <linux/serio.h>
  22
  23 #define DRIVER_DESC     "Dynapro serial touchscreen driver"
  24
  25 MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
  26 MODULE_DESCRIPTION(DRIVER_DESC);
  27 MODULE_LICENSE("GPL");
  28
  29 /*
  30  * Definitions & global arrays.
  31  */
  32
  33 #define DYNAPRO_FORMAT_TOUCH_BIT 0x40
  34 #define DYNAPRO_FORMAT_LENGTH 3
  35 #define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
  36
  37 #define DYNAPRO_MIN_XC 0
  38 #define DYNAPRO_MAX_XC 0x3ff
  39 #define DYNAPRO_MIN_YC 0
  40 #define DYNAPRO_MAX_YC 0x3ff
  41
  42 #define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
  43 #define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
  44 #define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
  45
  46 /*
  47  * Per-touchscreen data.
  48  */
  49
  50 struct dynapro {
  51         struct input_dev *dev;
  52         struct serio *serio;
  53         int idx;
  54         unsigned char data[DYNAPRO_FORMAT_LENGTH];
  55         char phys[32];
  56 };
  57
  58 static void dynapro_process_data(struct dynapro *pdynapro)
  59 {
  60         struct input_dev *dev = pdynapro->dev;
  61
  62         if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
  63                 input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
  64                 input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
  65                 input_report_key(dev, BTN_TOUCH,
  66                                  DYNAPRO_GET_TOUCHED(pdynapro->data));
  67                 input_sync(dev);
  68
  69                 pdynapro->idx = 0;
  70         }
  71 }
  72
  73 static irqreturn_t dynapro_interrupt(struct serio *serio,
  74                 unsigned char data, unsigned int flags)
  75 {
  76         struct dynapro *pdynapro = serio_get_drvdata(serio);
  77
  78         pdynapro->data[pdynapro->idx] = data;
  79
  80         if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
  81                 dynapro_process_data(pdynapro);
  82         else
  83                 dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
  84                         pdynapro->data[0]);
  85
  86         return IRQ_HANDLED;
  87 }
  88
  89 static void dynapro_disconnect(struct serio *serio)
  90 {
  91         struct dynapro *pdynapro = serio_get_drvdata(serio);
  92
  93         input_get_device(pdynapro->dev);
  94         input_unregister_device(pdynapro->dev);
  95         serio_close(serio);
  96         serio_set_drvdata(serio, NULL);
  97         input_put_device(pdynapro->dev);
  98         kfree(pdynapro);
  99 }
 100
 101 /*
 102  * dynapro_connect() is the routine that is called when someone adds a
 103  * new serio device that supports dynapro protocol and registers it as
 104  * an input device. This is usually accomplished using inputattach.
 105  */
 106
 107 static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
 108 {
 109         struct dynapro *pdynapro;
 110         struct input_dev *input_dev;
 111         int err;
 112
 113         pdynapro = kzalloc(sizeof(*pdynapro), GFP_KERNEL);
 114         input_dev = input_allocate_device();
 115         if (!pdynapro || !input_dev) {
 116                 err = -ENOMEM;
 117                 goto fail1;
 118         }
 119
 120         pdynapro->serio = serio;
 121         pdynapro->dev = input_dev;
 122         snprintf(pdynapro->phys, sizeof(pdynapro->phys),
 123                  "%s/input0", serio->phys);
 124
 125         input_dev->name = "Dynapro Serial TouchScreen";
 126         input_dev->phys = pdynapro->phys;
 127         input_dev->id.bustype = BUS_RS232;
 128         input_dev->id.vendor = SERIO_DYNAPRO;
 129         input_dev->id.product = 0;
 130         input_dev->id.version = 0x0001;
 131         input_dev->dev.parent = &serio->dev;
 132         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 133         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 134         input_set_abs_params(pdynapro->dev, ABS_X,
 135                              DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
 136         input_set_abs_params(pdynapro->dev, ABS_Y,
 137                              DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
 138
 139         serio_set_drvdata(serio, pdynapro);
 140
 141         err = serio_open(serio, drv);
 142         if (err)
 143                 goto fail2;
 144
 145         err = input_register_device(pdynapro->dev);
 146         if (err)
 147                 goto fail3;
 148
 149         return 0;
 150
 151  fail3: serio_close(serio);
 152  fail2: serio_set_drvdata(serio, NULL);
 153  fail1: input_free_device(input_dev);
 154         kfree(pdynapro);
 155         return err;
 156 }
 157
 158 /*
 159  * The serio driver structure.
 160  */
 161
 162 static const struct serio_device_id dynapro_serio_ids[] = {
 163         {
 164                 .type   = SERIO_RS232,
 165                 .proto  = SERIO_DYNAPRO,
 166                 .id     = SERIO_ANY,
 167                 .extra  = SERIO_ANY,
 168         },
 169         { 0 }
 170 };
 171
 172 MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
 173
 174 static struct serio_driver dynapro_drv = {
 175         .driver         = {
 176                 .name   = "dynapro",
 177         },
 178         .description    = DRIVER_DESC,
 179         .id_table       = dynapro_serio_ids,
 180         .interrupt      = dynapro_interrupt,
 181         .connect        = dynapro_connect,
 182         .disconnect     = dynapro_disconnect,
 183 };
 184
 185 module_serio_driver(dynapro_drv);