root/drivers/input/touchscreen/inexio.c

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DEFINITIONS

This source file includes following definitions.
  1. inexio_process_data
  2. inexio_interrupt
  3. inexio_disconnect
  4. inexio_connect

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * iNexio serial touchscreen driver
   4  *
   5  * Copyright (c) 2008 Richard Lemon
   6  * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
   7  */
   8 
   9 
  10 /*
  11  * 2008/06/19 Richard Lemon <richard@codelemon.com>
  12  *   Copied mtouch.c and edited for iNexio protocol
  13  */
  14 
  15 #include <linux/errno.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/input.h>
  20 #include <linux/serio.h>
  21 
  22 #define DRIVER_DESC     "iNexio serial touchscreen driver"
  23 
  24 MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>");
  25 MODULE_DESCRIPTION(DRIVER_DESC);
  26 MODULE_LICENSE("GPL");
  27 
  28 /*
  29  * Definitions & global arrays.
  30  */
  31 
  32 #define INEXIO_FORMAT_TOUCH_BIT 0x01
  33 #define INEXIO_FORMAT_LENGTH 5
  34 #define INEXIO_RESPONSE_BEGIN_BYTE 0x80
  35 
  36 /* todo: check specs for max length of all responses */
  37 #define INEXIO_MAX_LENGTH 16
  38 
  39 #define INEXIO_MIN_XC 0
  40 #define INEXIO_MAX_XC 0x3fff
  41 #define INEXIO_MIN_YC 0
  42 #define INEXIO_MAX_YC 0x3fff
  43 
  44 #define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
  45 #define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
  46 #define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])
  47 
  48 /*
  49  * Per-touchscreen data.
  50  */
  51 
  52 struct inexio {
  53         struct input_dev *dev;
  54         struct serio *serio;
  55         int idx;
  56         unsigned char data[INEXIO_MAX_LENGTH];
  57         char phys[32];
  58 };
  59 
  60 static void inexio_process_data(struct inexio *pinexio)
  61 {
  62         struct input_dev *dev = pinexio->dev;
  63 
  64         if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
  65                 input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
  66                 input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
  67                 input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
  68                 input_sync(dev);
  69 
  70                 pinexio->idx = 0;
  71         }
  72 }
  73 
  74 static irqreturn_t inexio_interrupt(struct serio *serio,
  75                 unsigned char data, unsigned int flags)
  76 {
  77         struct inexio *pinexio = serio_get_drvdata(serio);
  78 
  79         pinexio->data[pinexio->idx] = data;
  80 
  81         if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
  82                 inexio_process_data(pinexio);
  83         else
  84                 printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]);
  85 
  86         return IRQ_HANDLED;
  87 }
  88 
  89 /*
  90  * inexio_disconnect() is the opposite of inexio_connect()
  91  */
  92 
  93 static void inexio_disconnect(struct serio *serio)
  94 {
  95         struct inexio *pinexio = serio_get_drvdata(serio);
  96 
  97         input_get_device(pinexio->dev);
  98         input_unregister_device(pinexio->dev);
  99         serio_close(serio);
 100         serio_set_drvdata(serio, NULL);
 101         input_put_device(pinexio->dev);
 102         kfree(pinexio);
 103 }
 104 
 105 /*
 106  * inexio_connect() is the routine that is called when someone adds a
 107  * new serio device that supports iNexio protocol and registers it as
 108  * an input device. This is usually accomplished using inputattach.
 109  */
 110 
 111 static int inexio_connect(struct serio *serio, struct serio_driver *drv)
 112 {
 113         struct inexio *pinexio;
 114         struct input_dev *input_dev;
 115         int err;
 116 
 117         pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
 118         input_dev = input_allocate_device();
 119         if (!pinexio || !input_dev) {
 120                 err = -ENOMEM;
 121                 goto fail1;
 122         }
 123 
 124         pinexio->serio = serio;
 125         pinexio->dev = input_dev;
 126         snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);
 127 
 128         input_dev->name = "iNexio Serial TouchScreen";
 129         input_dev->phys = pinexio->phys;
 130         input_dev->id.bustype = BUS_RS232;
 131         input_dev->id.vendor = SERIO_INEXIO;
 132         input_dev->id.product = 0;
 133         input_dev->id.version = 0x0001;
 134         input_dev->dev.parent = &serio->dev;
 135         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 136         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 137         input_set_abs_params(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
 138         input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);
 139 
 140         serio_set_drvdata(serio, pinexio);
 141 
 142         err = serio_open(serio, drv);
 143         if (err)
 144                 goto fail2;
 145 
 146         err = input_register_device(pinexio->dev);
 147         if (err)
 148                 goto fail3;
 149 
 150         return 0;
 151 
 152  fail3: serio_close(serio);
 153  fail2: serio_set_drvdata(serio, NULL);
 154  fail1: input_free_device(input_dev);
 155         kfree(pinexio);
 156         return err;
 157 }
 158 
 159 /*
 160  * The serio driver structure.
 161  */
 162 
 163 static const struct serio_device_id inexio_serio_ids[] = {
 164         {
 165                 .type   = SERIO_RS232,
 166                 .proto  = SERIO_INEXIO,
 167                 .id     = SERIO_ANY,
 168                 .extra  = SERIO_ANY,
 169         },
 170         { 0 }
 171 };
 172 
 173 MODULE_DEVICE_TABLE(serio, inexio_serio_ids);
 174 
 175 static struct serio_driver inexio_drv = {
 176         .driver         = {
 177                 .name   = "inexio",
 178         },
 179         .description    = DRIVER_DESC,
 180         .id_table       = inexio_serio_ids,
 181         .interrupt      = inexio_interrupt,
 182         .connect        = inexio_connect,
 183         .disconnect     = inexio_disconnect,
 184 };
 185 
 186 module_serio_driver(inexio_drv);

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