linux/drivers/input/joystick/stinger.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Copyright (c) 2000-2001 Vojtech Pavlik
   4 *  Copyright (c) 2000 Mark Fletcher
   5 */
   6
   7/*
   8 * Gravis Stinger gamepad driver for Linux
   9 */
  10
  11/*
  12 */
  13
  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     "Gravis Stinger gamepad driver"
  21
  22MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  23MODULE_DESCRIPTION(DRIVER_DESC);
  24MODULE_LICENSE("GPL");
  25
  26/*
  27 * Constants.
  28 */
  29
  30#define STINGER_MAX_LENGTH 8
  31
  32/*
  33 * Per-Stinger data.
  34 */
  35
  36struct stinger {
  37        struct input_dev *dev;
  38        int idx;
  39        unsigned char data[STINGER_MAX_LENGTH];
  40        char phys[32];
  41};
  42
  43/*
  44 * stinger_process_packet() decodes packets the driver receives from the
  45 * Stinger. It updates the data accordingly.
  46 */
  47
  48static void stinger_process_packet(struct stinger *stinger)
  49{
  50        struct input_dev *dev = stinger->dev;
  51        unsigned char *data = stinger->data;
  52
  53        if (!stinger->idx) return;
  54
  55        input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
  56        input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
  57        input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
  58        input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
  59        input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
  60        input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
  61        input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
  62        input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
  63        input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
  64        input_report_key(dev, BTN_START,   (data[3] & 0x01));
  65
  66        input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
  67        input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
  68
  69        input_sync(dev);
  70
  71        return;
  72}
  73
  74/*
  75 * stinger_interrupt() is called by the low level driver when characters
  76 * are ready for us. We then buffer them for further processing, or call the
  77 * packet processing routine.
  78 */
  79
  80static irqreturn_t stinger_interrupt(struct serio *serio,
  81        unsigned char data, unsigned int flags)
  82{
  83        struct stinger *stinger = serio_get_drvdata(serio);
  84
  85        /* All Stinger packets are 4 bytes */
  86
  87        if (stinger->idx < STINGER_MAX_LENGTH)
  88                stinger->data[stinger->idx++] = data;
  89
  90        if (stinger->idx == 4) {
  91                stinger_process_packet(stinger);
  92                stinger->idx = 0;
  93        }
  94
  95        return IRQ_HANDLED;
  96}
  97
  98/*
  99 * stinger_disconnect() is the opposite of stinger_connect()
 100 */
 101
 102static void stinger_disconnect(struct serio *serio)
 103{
 104        struct stinger *stinger = serio_get_drvdata(serio);
 105
 106        serio_close(serio);
 107        serio_set_drvdata(serio, NULL);
 108        input_unregister_device(stinger->dev);
 109        kfree(stinger);
 110}
 111
 112/*
 113 * stinger_connect() is the routine that is called when someone adds a
 114 * new serio device that supports Stinger protocol and registers it as
 115 * an input device.
 116 */
 117
 118static int stinger_connect(struct serio *serio, struct serio_driver *drv)
 119{
 120        struct stinger *stinger;
 121        struct input_dev *input_dev;
 122        int err = -ENOMEM;
 123
 124        stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
 125        input_dev = input_allocate_device();
 126        if (!stinger || !input_dev)
 127                goto fail1;
 128
 129        stinger->dev = input_dev;
 130        snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
 131
 132        input_dev->name = "Gravis Stinger";
 133        input_dev->phys = stinger->phys;
 134        input_dev->id.bustype = BUS_RS232;
 135        input_dev->id.vendor = SERIO_STINGER;
 136        input_dev->id.product = 0x0001;
 137        input_dev->id.version = 0x0100;
 138        input_dev->dev.parent = &serio->dev;
 139
 140        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 141        input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
 142                BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
 143                BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
 144                BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
 145        input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
 146        input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
 147
 148        serio_set_drvdata(serio, stinger);
 149
 150        err = serio_open(serio, drv);
 151        if (err)
 152                goto fail2;
 153
 154        err = input_register_device(stinger->dev);
 155        if (err)
 156                goto fail3;
 157
 158        return 0;
 159
 160 fail3: serio_close(serio);
 161 fail2: serio_set_drvdata(serio, NULL);
 162 fail1: input_free_device(input_dev);
 163        kfree(stinger);
 164        return err;
 165}
 166
 167/*
 168 * The serio driver structure.
 169 */
 170
 171static const struct serio_device_id stinger_serio_ids[] = {
 172        {
 173                .type   = SERIO_RS232,
 174                .proto  = SERIO_STINGER,
 175                .id     = SERIO_ANY,
 176                .extra  = SERIO_ANY,
 177        },
 178        { 0 }
 179};
 180
 181MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
 182
 183static struct serio_driver stinger_drv = {
 184        .driver         = {
 185                .name   = "stinger",
 186        },
 187        .description    = DRIVER_DESC,
 188        .id_table       = stinger_serio_ids,
 189        .interrupt      = stinger_interrupt,
 190        .connect        = stinger_connect,
 191        .disconnect     = stinger_disconnect,
 192};
 193
 194module_serio_driver(stinger_drv);
 195