drivers/input/joystick/stinger.c

   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 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/input.h>
  15 #include <linux/serio.h>
  16
  17 #define DRIVER_DESC     "Gravis Stinger gamepad driver"
  18
  19 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  20 MODULE_DESCRIPTION(DRIVER_DESC);
  21 MODULE_LICENSE("GPL");
  22
  23 /*
  24  * Constants.
  25  */
  26
  27 #define STINGER_MAX_LENGTH 8
  28
  29 /*
  30  * Per-Stinger data.
  31  */
  32
  33 struct stinger {
  34         struct input_dev *dev;
  35         int idx;
  36         unsigned char data[STINGER_MAX_LENGTH];
  37         char phys[32];
  38 };
  39
  40 /*
  41  * stinger_process_packet() decodes packets the driver receives from the
  42  * Stinger. It updates the data accordingly.
  43  */
  44
  45 static void stinger_process_packet(struct stinger *stinger)
  46 {
  47         struct input_dev *dev = stinger->dev;
  48         unsigned char *data = stinger->data;
  49
  50         if (!stinger->idx) return;
  51
  52         input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
  53         input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
  54         input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
  55         input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
  56         input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
  57         input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
  58         input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
  59         input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
  60         input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
  61         input_report_key(dev, BTN_START,   (data[3] & 0x01));
  62
  63         input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
  64         input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
  65
  66         input_sync(dev);
  67
  68         return;
  69 }
  70
  71 /*
  72  * stinger_interrupt() is called by the low level driver when characters
  73  * are ready for us. We then buffer them for further processing, or call the
  74  * packet processing routine.
  75  */
  76
  77 static irqreturn_t stinger_interrupt(struct serio *serio,
  78         unsigned char data, unsigned int flags)
  79 {
  80         struct stinger *stinger = serio_get_drvdata(serio);
  81
  82         /* All Stinger packets are 4 bytes */
  83
  84         if (stinger->idx < STINGER_MAX_LENGTH)
  85                 stinger->data[stinger->idx++] = data;
  86
  87         if (stinger->idx == 4) {
  88                 stinger_process_packet(stinger);
  89                 stinger->idx = 0;
  90         }
  91
  92         return IRQ_HANDLED;
  93 }
  94
  95 /*
  96  * stinger_disconnect() is the opposite of stinger_connect()
  97  */
  98
  99 static void stinger_disconnect(struct serio *serio)
 100 {
 101         struct stinger *stinger = serio_get_drvdata(serio);
 102
 103         serio_close(serio);
 104         serio_set_drvdata(serio, NULL);
 105         input_unregister_device(stinger->dev);
 106         kfree(stinger);
 107 }
 108
 109 /*
 110  * stinger_connect() is the routine that is called when someone adds a
 111  * new serio device that supports Stinger protocol and registers it as
 112  * an input device.
 113  */
 114
 115 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
 116 {
 117         struct stinger *stinger;
 118         struct input_dev *input_dev;
 119         int err = -ENOMEM;
 120
 121         stinger = kmalloc(sizeof(*stinger), GFP_KERNEL);
 122         input_dev = input_allocate_device();
 123         if (!stinger || !input_dev)
 124                 goto fail1;
 125
 126         stinger->dev = input_dev;
 127         snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
 128
 129         input_dev->name = "Gravis Stinger";
 130         input_dev->phys = stinger->phys;
 131         input_dev->id.bustype = BUS_RS232;
 132         input_dev->id.vendor = SERIO_STINGER;
 133         input_dev->id.product = 0x0001;
 134         input_dev->id.version = 0x0100;
 135         input_dev->dev.parent = &serio->dev;
 136
 137         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 138         input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
 139                 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
 140                 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
 141                 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
 142         input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
 143         input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
 144
 145         serio_set_drvdata(serio, stinger);
 146
 147         err = serio_open(serio, drv);
 148         if (err)
 149                 goto fail2;
 150
 151         err = input_register_device(stinger->dev);
 152         if (err)
 153                 goto fail3;
 154
 155         return 0;
 156
 157  fail3: serio_close(serio);
 158  fail2: serio_set_drvdata(serio, NULL);
 159  fail1: input_free_device(input_dev);
 160         kfree(stinger);
 161         return err;
 162 }
 163
 164 /*
 165  * The serio driver structure.
 166  */
 167
 168 static const struct serio_device_id stinger_serio_ids[] = {
 169         {
 170                 .type   = SERIO_RS232,
 171                 .proto  = SERIO_STINGER,
 172                 .id     = SERIO_ANY,
 173                 .extra  = SERIO_ANY,
 174         },
 175         { 0 }
 176 };
 177
 178 MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
 179
 180 static struct serio_driver stinger_drv = {
 181         .driver         = {
 182                 .name   = "stinger",
 183         },
 184         .description    = DRIVER_DESC,
 185         .id_table       = stinger_serio_ids,
 186         .interrupt      = stinger_interrupt,
 187         .connect        = stinger_connect,
 188         .disconnect     = stinger_disconnect,
 189 };
 190
 191 module_serio_driver(stinger_drv);