drivers/input/joystick/cobra.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 1999-2001 Vojtech Pavlik
   4  */
   5
   6 /*
   7  * Creative Labs Blaster GamePad Cobra driver for Linux
   8  */
   9
  10 /*
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/gameport.h>
  17 #include <linux/input.h>
  18 #include <linux/jiffies.h>
  19
  20 #define DRIVER_DESC     "Creative Labs Blaster GamePad Cobra driver"
  21
  22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  23 MODULE_DESCRIPTION(DRIVER_DESC);
  24 MODULE_LICENSE("GPL");
  25
  26 #define COBRA_MAX_STROBE        45      /* 45 us max wait for first strobe */
  27 #define COBRA_LENGTH            36
  28
  29 static int cobra_btn[] = { BTN_START, BTN_SELECT, BTN_TL, BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL2, BTN_TR2, 0 };
  30
  31 struct cobra {
  32         struct gameport *gameport;
  33         struct input_dev *dev[2];
  34         int reads;
  35         int bads;
  36         unsigned char exists;
  37         char phys[2][32];
  38 };
  39
  40 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
  41 {
  42         unsigned long flags;
  43         unsigned char u, v, w;
  44         __u64 buf[2];
  45         int r[2], t[2];
  46         int i, j, ret;
  47
  48         int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
  49
  50         for (i = 0; i < 2; i++) {
  51                 r[i] = buf[i] = 0;
  52                 t[i] = COBRA_MAX_STROBE;
  53         }
  54
  55         local_irq_save(flags);
  56
  57         u = gameport_read(gameport);
  58
  59         do {
  60                 t[0]--; t[1]--;
  61                 v = gameport_read(gameport);
  62                 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
  63                         if (w & 0x30) {
  64                                 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
  65                                         buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
  66                                         t[i] = strobe;
  67                                         u = v;
  68                                 } else t[i] = 0;
  69                         }
  70         } while (t[0] > 0 || t[1] > 0);
  71
  72         local_irq_restore(flags);
  73
  74         ret = 0;
  75
  76         for (i = 0; i < 2; i++) {
  77
  78                 if (r[i] != COBRA_LENGTH) continue;
  79
  80                 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
  81                         buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
  82
  83                 if (j < COBRA_LENGTH) ret |= (1 << i);
  84
  85                 data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
  86                         | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
  87                         | ((buf[i] >> 11) & 0x1f00000);
  88
  89         }
  90
  91         return ret;
  92 }
  93
  94 static void cobra_poll(struct gameport *gameport)
  95 {
  96         struct cobra *cobra = gameport_get_drvdata(gameport);
  97         struct input_dev *dev;
  98         unsigned int data[2];
  99         int i, j, r;
 100
 101         cobra->reads++;
 102
 103         if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
 104                 cobra->bads++;
 105                 return;
 106         }
 107
 108         for (i = 0; i < 2; i++)
 109                 if (cobra->exists & r & (1 << i)) {
 110
 111                         dev = cobra->dev[i];
 112
 113                         input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
 114                         input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
 115
 116                         for (j = 0; cobra_btn[j]; j++)
 117                                 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
 118
 119                         input_sync(dev);
 120
 121                 }
 122 }
 123
 124 static int cobra_open(struct input_dev *dev)
 125 {
 126         struct cobra *cobra = input_get_drvdata(dev);
 127
 128         gameport_start_polling(cobra->gameport);
 129         return 0;
 130 }
 131
 132 static void cobra_close(struct input_dev *dev)
 133 {
 134         struct cobra *cobra = input_get_drvdata(dev);
 135
 136         gameport_stop_polling(cobra->gameport);
 137 }
 138
 139 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
 140 {
 141         struct cobra *cobra;
 142         struct input_dev *input_dev;
 143         unsigned int data[2];
 144         int i, j;
 145         int err;
 146
 147         cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
 148         if (!cobra)
 149                 return -ENOMEM;
 150
 151         cobra->gameport = gameport;
 152
 153         gameport_set_drvdata(gameport, cobra);
 154
 155         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 156         if (err)
 157                 goto fail1;
 158
 159         cobra->exists = cobra_read_packet(gameport, data);
 160
 161         for (i = 0; i < 2; i++)
 162                 if ((cobra->exists >> i) & data[i] & 1) {
 163                         printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
 164                                 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
 165                         cobra->exists &= ~(1 << i);
 166                 }
 167
 168         if (!cobra->exists) {
 169                 err = -ENODEV;
 170                 goto fail2;
 171         }
 172
 173         gameport_set_poll_handler(gameport, cobra_poll);
 174         gameport_set_poll_interval(gameport, 20);
 175
 176         for (i = 0; i < 2; i++) {
 177                 if (~(cobra->exists >> i) & 1)
 178                         continue;
 179
 180                 cobra->dev[i] = input_dev = input_allocate_device();
 181                 if (!input_dev) {
 182                         err = -ENOMEM;
 183                         goto fail3;
 184                 }
 185
 186                 snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
 187                          "%s/input%d", gameport->phys, i);
 188
 189                 input_dev->name = "Creative Labs Blaster GamePad Cobra";
 190                 input_dev->phys = cobra->phys[i];
 191                 input_dev->id.bustype = BUS_GAMEPORT;
 192                 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
 193                 input_dev->id.product = 0x0008;
 194                 input_dev->id.version = 0x0100;
 195                 input_dev->dev.parent = &gameport->dev;
 196
 197                 input_set_drvdata(input_dev, cobra);
 198
 199                 input_dev->open = cobra_open;
 200                 input_dev->close = cobra_close;
 201
 202                 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 203                 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
 204                 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
 205                 for (j = 0; cobra_btn[j]; j++)
 206                         set_bit(cobra_btn[j], input_dev->keybit);
 207
 208                 err = input_register_device(cobra->dev[i]);
 209                 if (err)
 210                         goto fail4;
 211         }
 212
 213         return 0;
 214
 215  fail4: input_free_device(cobra->dev[i]);
 216  fail3: while (--i >= 0)
 217                 if (cobra->dev[i])
 218                         input_unregister_device(cobra->dev[i]);
 219  fail2: gameport_close(gameport);
 220  fail1: gameport_set_drvdata(gameport, NULL);
 221         kfree(cobra);
 222         return err;
 223 }
 224
 225 static void cobra_disconnect(struct gameport *gameport)
 226 {
 227         struct cobra *cobra = gameport_get_drvdata(gameport);
 228         int i;
 229
 230         for (i = 0; i < 2; i++)
 231                 if ((cobra->exists >> i) & 1)
 232                         input_unregister_device(cobra->dev[i]);
 233         gameport_close(gameport);
 234         gameport_set_drvdata(gameport, NULL);
 235         kfree(cobra);
 236 }
 237
 238 static struct gameport_driver cobra_drv = {
 239         .driver         = {
 240                 .name   = "cobra",
 241         },
 242         .description    = DRIVER_DESC,
 243         .connect        = cobra_connect,
 244         .disconnect     = cobra_disconnect,
 245 };
 246
 247 module_gameport_driver(cobra_drv);