drivers/input/joystick/turbografx.c

   1 /*
   2  *  Copyright (c) 1998-2001 Vojtech Pavlik
   3  *
   4  *  Based on the work of:
   5  *      Steffen Schwenke
   6  */
   7
   8 /*
   9  * TurboGraFX parallel port interface driver for Linux.
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/parport.h>
  30 #include <linux/input.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/mutex.h>
  34 #include <linux/slab.h>
  35
  36 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  37 MODULE_DESCRIPTION("TurboGraFX parallel port interface driver");
  38 MODULE_LICENSE("GPL");
  39
  40 #define TGFX_MAX_PORTS          3
  41 #define TGFX_MAX_DEVICES        7
  42
  43 struct tgfx_config {
  44         int args[TGFX_MAX_DEVICES + 1];
  45         unsigned int nargs;
  46 };
  47
  48 static struct tgfx_config tgfx_cfg[TGFX_MAX_PORTS];
  49
  50 module_param_array_named(map, tgfx_cfg[0].args, int, &tgfx_cfg[0].nargs, 0);
  51 MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<js1>,<js2>,..<js7>");
  52 module_param_array_named(map2, tgfx_cfg[1].args, int, &tgfx_cfg[1].nargs, 0);
  53 MODULE_PARM_DESC(map2, "Describes second set of devices");
  54 module_param_array_named(map3, tgfx_cfg[2].args, int, &tgfx_cfg[2].nargs, 0);
  55 MODULE_PARM_DESC(map3, "Describes third set of devices");
  56
  57 #define TGFX_REFRESH_TIME       HZ/100  /* 10 ms */
  58
  59 #define TGFX_TRIGGER            0x08
  60 #define TGFX_UP                 0x10
  61 #define TGFX_DOWN               0x20
  62 #define TGFX_LEFT               0x40
  63 #define TGFX_RIGHT              0x80
  64
  65 #define TGFX_THUMB              0x02
  66 #define TGFX_THUMB2             0x04
  67 #define TGFX_TOP                0x01
  68 #define TGFX_TOP2               0x08
  69
  70 static int tgfx_buttons[] = { BTN_TRIGGER, BTN_THUMB, BTN_THUMB2, BTN_TOP, BTN_TOP2 };
  71
  72 static struct tgfx {
  73         struct pardevice *pd;
  74         struct timer_list timer;
  75         struct input_dev *dev[TGFX_MAX_DEVICES];
  76         char name[TGFX_MAX_DEVICES][64];
  77         char phys[TGFX_MAX_DEVICES][32];
  78         int sticks;
  79         int used;
  80         int parportno;
  81         struct mutex sem;
  82 } *tgfx_base[TGFX_MAX_PORTS];
  83
  84 /*
  85  * tgfx_timer() reads and analyzes TurboGraFX joystick data.
  86  */
  87
  88 static void tgfx_timer(struct timer_list *t)
  89 {
  90         struct tgfx *tgfx = from_timer(tgfx, t, timer);
  91         struct input_dev *dev;
  92         int data1, data2, i;
  93
  94         for (i = 0; i < 7; i++)
  95                 if (tgfx->sticks & (1 << i)) {
  96
  97                         dev = tgfx->dev[i];
  98
  99                         parport_write_data(tgfx->pd->port, ~(1 << i));
 100                         data1 = parport_read_status(tgfx->pd->port) ^ 0x7f;
 101                         data2 = parport_read_control(tgfx->pd->port) ^ 0x04;    /* CAVEAT parport */
 102
 103                         input_report_abs(dev, ABS_X, !!(data1 & TGFX_RIGHT) - !!(data1 & TGFX_LEFT));
 104                         input_report_abs(dev, ABS_Y, !!(data1 & TGFX_DOWN ) - !!(data1 & TGFX_UP  ));
 105
 106                         input_report_key(dev, BTN_TRIGGER, (data1 & TGFX_TRIGGER));
 107                         input_report_key(dev, BTN_THUMB,   (data2 & TGFX_THUMB  ));
 108                         input_report_key(dev, BTN_THUMB2,  (data2 & TGFX_THUMB2 ));
 109                         input_report_key(dev, BTN_TOP,     (data2 & TGFX_TOP    ));
 110                         input_report_key(dev, BTN_TOP2,    (data2 & TGFX_TOP2   ));
 111
 112                         input_sync(dev);
 113                 }
 114
 115         mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
 116 }
 117
 118 static int tgfx_open(struct input_dev *dev)
 119 {
 120         struct tgfx *tgfx = input_get_drvdata(dev);
 121         int err;
 122
 123         err = mutex_lock_interruptible(&tgfx->sem);
 124         if (err)
 125                 return err;
 126
 127         if (!tgfx->used++) {
 128                 parport_claim(tgfx->pd);
 129                 parport_write_control(tgfx->pd->port, 0x04);
 130                 mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
 131         }
 132
 133         mutex_unlock(&tgfx->sem);
 134         return 0;
 135 }
 136
 137 static void tgfx_close(struct input_dev *dev)
 138 {
 139         struct tgfx *tgfx = input_get_drvdata(dev);
 140
 141         mutex_lock(&tgfx->sem);
 142         if (!--tgfx->used) {
 143                 del_timer_sync(&tgfx->timer);
 144                 parport_write_control(tgfx->pd->port, 0x00);
 145                 parport_release(tgfx->pd);
 146         }
 147         mutex_unlock(&tgfx->sem);
 148 }
 149
 150
 151
 152 /*
 153  * tgfx_probe() probes for tg gamepads.
 154  */
 155
 156 static void tgfx_attach(struct parport *pp)
 157 {
 158         struct tgfx *tgfx;
 159         struct input_dev *input_dev;
 160         struct pardevice *pd;
 161         int i, j, port_idx;
 162         int *n_buttons, n_devs;
 163         struct pardev_cb tgfx_parport_cb;
 164
 165         for (port_idx = 0; port_idx < TGFX_MAX_PORTS; port_idx++) {
 166                 if (tgfx_cfg[port_idx].nargs == 0 ||
 167                     tgfx_cfg[port_idx].args[0] < 0)
 168                         continue;
 169                 if (tgfx_cfg[port_idx].args[0] == pp->number)
 170                         break;
 171         }
 172
 173         if (port_idx == TGFX_MAX_PORTS) {
 174                 pr_debug("Not using parport%d.\n", pp->number);
 175                 return;
 176         }
 177         n_buttons = tgfx_cfg[port_idx].args + 1;
 178         n_devs = tgfx_cfg[port_idx].nargs - 1;
 179
 180         memset(&tgfx_parport_cb, 0, sizeof(tgfx_parport_cb));
 181         tgfx_parport_cb.flags = PARPORT_FLAG_EXCL;
 182
 183         pd = parport_register_dev_model(pp, "turbografx", &tgfx_parport_cb,
 184                                         port_idx);
 185         if (!pd) {
 186                 pr_err("parport busy already - lp.o loaded?\n");
 187                 return;
 188         }
 189
 190         tgfx = kzalloc(sizeof(struct tgfx), GFP_KERNEL);
 191         if (!tgfx) {
 192                 printk(KERN_ERR "turbografx.c: Not enough memory\n");
 193                 goto err_unreg_pardev;
 194         }
 195
 196         mutex_init(&tgfx->sem);
 197         tgfx->pd = pd;
 198         tgfx->parportno = pp->number;
 199         timer_setup(&tgfx->timer, tgfx_timer, 0);
 200
 201         for (i = 0; i < n_devs; i++) {
 202                 if (n_buttons[i] < 1)
 203                         continue;
 204
 205                 if (n_buttons[i] > ARRAY_SIZE(tgfx_buttons)) {
 206                         printk(KERN_ERR "turbografx.c: Invalid number of buttons %d\n", n_buttons[i]);
 207                         goto err_unreg_devs;
 208                 }
 209
 210                 tgfx->dev[i] = input_dev = input_allocate_device();
 211                 if (!input_dev) {
 212                         printk(KERN_ERR "turbografx.c: Not enough memory for input device\n");
 213                         goto err_unreg_devs;
 214                 }
 215
 216                 tgfx->sticks |= (1 << i);
 217                 snprintf(tgfx->name[i], sizeof(tgfx->name[i]),
 218                          "TurboGraFX %d-button Multisystem joystick", n_buttons[i]);
 219                 snprintf(tgfx->phys[i], sizeof(tgfx->phys[i]),
 220                          "%s/input%d", tgfx->pd->port->name, i);
 221
 222                 input_dev->name = tgfx->name[i];
 223                 input_dev->phys = tgfx->phys[i];
 224                 input_dev->id.bustype = BUS_PARPORT;
 225                 input_dev->id.vendor = 0x0003;
 226                 input_dev->id.product = n_buttons[i];
 227                 input_dev->id.version = 0x0100;
 228
 229                 input_set_drvdata(input_dev, tgfx);
 230
 231                 input_dev->open = tgfx_open;
 232                 input_dev->close = tgfx_close;
 233
 234                 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 235                 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
 236                 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
 237
 238                 for (j = 0; j < n_buttons[i]; j++)
 239                         set_bit(tgfx_buttons[j], input_dev->keybit);
 240
 241                 if (input_register_device(tgfx->dev[i]))
 242                         goto err_free_dev;
 243         }
 244
 245         if (!tgfx->sticks) {
 246                 printk(KERN_ERR "turbografx.c: No valid devices specified\n");
 247                 goto err_free_tgfx;
 248         }
 249
 250         tgfx_base[port_idx] = tgfx;
 251         return;
 252
 253  err_free_dev:
 254         input_free_device(tgfx->dev[i]);
 255  err_unreg_devs:
 256         while (--i >= 0)
 257                 if (tgfx->dev[i])
 258                         input_unregister_device(tgfx->dev[i]);
 259  err_free_tgfx:
 260         kfree(tgfx);
 261  err_unreg_pardev:
 262         parport_unregister_device(pd);
 263 }
 264
 265 static void tgfx_detach(struct parport *port)
 266 {
 267         int i;
 268         struct tgfx *tgfx;
 269
 270         for (i = 0; i < TGFX_MAX_PORTS; i++) {
 271                 if (tgfx_base[i] && tgfx_base[i]->parportno == port->number)
 272                         break;
 273         }
 274
 275         if (i == TGFX_MAX_PORTS)
 276                 return;
 277
 278         tgfx = tgfx_base[i];
 279         tgfx_base[i] = NULL;
 280
 281         for (i = 0; i < TGFX_MAX_DEVICES; i++)
 282                 if (tgfx->dev[i])
 283                         input_unregister_device(tgfx->dev[i]);
 284         parport_unregister_device(tgfx->pd);
 285         kfree(tgfx);
 286 }
 287
 288 static struct parport_driver tgfx_parport_driver = {
 289         .name = "turbografx",
 290         .match_port = tgfx_attach,
 291         .detach = tgfx_detach,
 292         .devmodel = true,
 293 };
 294
 295 static int __init tgfx_init(void)
 296 {
 297         int i;
 298         int have_dev = 0;
 299
 300         for (i = 0; i < TGFX_MAX_PORTS; i++) {
 301                 if (tgfx_cfg[i].nargs == 0 || tgfx_cfg[i].args[0] < 0)
 302                         continue;
 303
 304                 if (tgfx_cfg[i].nargs < 2) {
 305                         printk(KERN_ERR "turbografx.c: at least one joystick must be specified\n");
 306                         return -EINVAL;
 307                 }
 308
 309                 have_dev = 1;
 310         }
 311
 312         if (!have_dev)
 313                 return -ENODEV;
 314
 315         return parport_register_driver(&tgfx_parport_driver);
 316 }
 317
 318 static void __exit tgfx_exit(void)
 319 {
 320         parport_unregister_driver(&tgfx_parport_driver);
 321 }
 322
 323 module_init(tgfx_init);
 324 module_exit(tgfx_exit);