LXR linux/drivers/input/touchscreen/gunze.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Copyright (c) 2000-2001 Vojtech Pavlik
   4 */
   5
   6/*
   7 * Gunze AHL-51S touchscreen driver for Linux
   8 */
   9
  10/*
  11 */
  12
  13#include <linux/errno.h>
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/slab.h>
  17#include <linux/input.h>
  18#include <linux/serio.h>
  19
  20#define DRIVER_DESC     "Gunze AHL-51S touchscreen driver"
  21
  22MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  23MODULE_DESCRIPTION(DRIVER_DESC);
  24MODULE_LICENSE("GPL");
  25
  26/*
  27 * Definitions & global arrays.
  28 */
  29
  30#define GUNZE_MAX_LENGTH        10
  31
  32/*
  33 * Per-touchscreen data.
  34 */
  35
  36struct gunze {
  37        struct input_dev *dev;
  38        struct serio *serio;
  39        int idx;
  40        unsigned char data[GUNZE_MAX_LENGTH];
  41        char phys[32];
  42};
  43
  44static void gunze_process_packet(struct gunze *gunze)
  45{
  46        struct input_dev *dev = gunze->dev;
  47
  48        if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
  49                (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
  50                printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
  51                return;
  52        }
  53
  54        input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
  55        input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
  56        input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
  57        input_sync(dev);
  58}
  59
  60static irqreturn_t gunze_interrupt(struct serio *serio,
  61                unsigned char data, unsigned int flags)
  62{
  63        struct gunze *gunze = serio_get_drvdata(serio);
  64
  65        if (data == '\r') {
  66                gunze_process_packet(gunze);
  67                gunze->idx = 0;
  68        } else {
  69                if (gunze->idx < GUNZE_MAX_LENGTH)
  70                        gunze->data[gunze->idx++] = data;
  71        }
  72        return IRQ_HANDLED;
  73}
  74
  75/*
  76 * gunze_disconnect() is the opposite of gunze_connect()
  77 */
  78
  79static void gunze_disconnect(struct serio *serio)
  80{
  81        struct gunze *gunze = serio_get_drvdata(serio);
  82
  83        input_get_device(gunze->dev);
  84        input_unregister_device(gunze->dev);
  85        serio_close(serio);
  86        serio_set_drvdata(serio, NULL);
  87        input_put_device(gunze->dev);
  88        kfree(gunze);
  89}
  90
  91/*
  92 * gunze_connect() is the routine that is called when someone adds a
  93 * new serio device that supports Gunze protocol and registers it as
  94 * an input device.
  95 */
  96
  97static int gunze_connect(struct serio *serio, struct serio_driver *drv)
  98{
  99        struct gunze *gunze;
 100        struct input_dev *input_dev;
 101        int err;
 102
 103        gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
 104        input_dev = input_allocate_device();
 105        if (!gunze || !input_dev) {
 106                err = -ENOMEM;
 107                goto fail1;
 108        }
 109
 110        gunze->serio = serio;
 111        gunze->dev = input_dev;
 112        snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
 113
 114        input_dev->name = "Gunze AHL-51S TouchScreen";
 115        input_dev->phys = gunze->phys;
 116        input_dev->id.bustype = BUS_RS232;
 117        input_dev->id.vendor = SERIO_GUNZE;
 118        input_dev->id.product = 0x0051;
 119        input_dev->id.version = 0x0100;
 120        input_dev->dev.parent = &serio->dev;
 121        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 122        input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 123        input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
 124        input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
 125
 126        serio_set_drvdata(serio, gunze);
 127
 128        err = serio_open(serio, drv);
 129        if (err)
 130                goto fail2;
 131
 132        err = input_register_device(gunze->dev);
 133        if (err)
 134                goto fail3;
 135
 136        return 0;
 137
 138 fail3: serio_close(serio);
 139 fail2: serio_set_drvdata(serio, NULL);
 140 fail1: input_free_device(input_dev);
 141        kfree(gunze);
 142        return err;
 143}
 144
 145/*
 146 * The serio driver structure.
 147 */
 148
 149static const struct serio_device_id gunze_serio_ids[] = {
 150        {
 151                .type   = SERIO_RS232,
 152                .proto  = SERIO_GUNZE,
 153                .id     = SERIO_ANY,
 154                .extra  = SERIO_ANY,
 155        },
 156        { 0 }
 157};
 158
 159MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
 160
 161static struct serio_driver gunze_drv = {
 162        .driver         = {
 163                .name   = "gunze",
 164        },
 165        .description    = DRIVER_DESC,
 166        .id_table       = gunze_serio_ids,
 167        .interrupt      = gunze_interrupt,
 168        .connect        = gunze_connect,
 169        .disconnect     = gunze_disconnect,
 170};
 171
 172module_serio_driver(gunze_drv);
 173