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  * Should you need to contact me, the author, you can do so either by
  28  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  29  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  30  */
  31
  32 #include <linux/kernel.h>
  33 #include <linux/parport.h>
  34 #include <linux/input.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/mutex.h>
  38 #include <linux/slab.h>
  39
  40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  41 MODULE_DESCRIPTION("TurboGraFX parallel port interface driver");
  42 MODULE_LICENSE("GPL");
  43
  44 #define TGFX_MAX_PORTS          3
  45 #define TGFX_MAX_DEVICES        7
  46
  47 struct tgfx_config {
  48         int args[TGFX_MAX_DEVICES + 1];
  49         unsigned int nargs;
  50 };
  51
  52 static struct tgfx_config tgfx_cfg[TGFX_MAX_PORTS] __initdata;
  53
  54 module_param_array_named(map, tgfx_cfg[0].args, int, &tgfx_cfg[0].nargs, 0);
  55 MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<js1>,<js2>,..<js7>");
  56 module_param_array_named(map2, tgfx_cfg[1].args, int, &tgfx_cfg[1].nargs, 0);
  57 MODULE_PARM_DESC(map2, "Describes second set of devices");
  58 module_param_array_named(map3, tgfx_cfg[2].args, int, &tgfx_cfg[2].nargs, 0);
  59 MODULE_PARM_DESC(map3, "Describes third set of devices");
  60
  61 #define TGFX_REFRESH_TIME       HZ/100  /* 10 ms */
  62
  63 #define TGFX_TRIGGER            0x08
  64 #define TGFX_UP                 0x10
  65 #define TGFX_DOWN               0x20
  66 #define TGFX_LEFT               0x40
  67 #define TGFX_RIGHT              0x80
  68
  69 #define TGFX_THUMB              0x02
  70 #define TGFX_THUMB2             0x04
  71 #define TGFX_TOP                0x01
  72 #define TGFX_TOP2               0x08
  73
  74 static int tgfx_buttons[] = { BTN_TRIGGER, BTN_THUMB, BTN_THUMB2, BTN_TOP, BTN_TOP2 };
  75
  76 static struct tgfx {
  77         struct pardevice *pd;
  78         struct timer_list timer;
  79         struct input_dev *dev[TGFX_MAX_DEVICES];
  80         char name[TGFX_MAX_DEVICES][64];
  81         char phys[TGFX_MAX_DEVICES][32];
  82         int sticks;
  83         int used;
  84         struct mutex sem;
  85 } *tgfx_base[TGFX_MAX_PORTS];
  86
  87 /*
  88  * tgfx_timer() reads and analyzes TurboGraFX joystick data.
  89  */
  90
  91 static void tgfx_timer(unsigned long private)
  92 {
  93         struct tgfx *tgfx = (void *) private;
  94         struct input_dev *dev;
  95         int data1, data2, i;
  96
  97         for (i = 0; i < 7; i++)
  98                 if (tgfx->sticks & (1 << i)) {
  99
 100                         dev = tgfx->dev[i];
 101
 102                         parport_write_data(tgfx->pd->port, ~(1 << i));
 103                         data1 = parport_read_status(tgfx->pd->port) ^ 0x7f;
 104                         data2 = parport_read_control(tgfx->pd->port) ^ 0x04;    /* CAVEAT parport */
 105
 106                         input_report_abs(dev, ABS_X, !!(data1 & TGFX_RIGHT) - !!(data1 & TGFX_LEFT));
 107                         input_report_abs(dev, ABS_Y, !!(data1 & TGFX_DOWN ) - !!(data1 & TGFX_UP  ));
 108
 109                         input_report_key(dev, BTN_TRIGGER, (data1 & TGFX_TRIGGER));
 110                         input_report_key(dev, BTN_THUMB,   (data2 & TGFX_THUMB  ));
 111                         input_report_key(dev, BTN_THUMB2,  (data2 & TGFX_THUMB2 ));
 112                         input_report_key(dev, BTN_TOP,     (data2 & TGFX_TOP    ));
 113                         input_report_key(dev, BTN_TOP2,    (data2 & TGFX_TOP2   ));
 114
 115                         input_sync(dev);
 116                 }
 117
 118         mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
 119 }
 120
 121 static int tgfx_open(struct input_dev *dev)
 122 {
 123         struct tgfx *tgfx = input_get_drvdata(dev);
 124         int err;
 125
 126         err = mutex_lock_interruptible(&tgfx->sem);
 127         if (err)
 128                 return err;
 129
 130         if (!tgfx->used++) {
 131                 parport_claim(tgfx->pd);
 132                 parport_write_control(tgfx->pd->port, 0x04);
 133                 mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
 134         }
 135
 136         mutex_unlock(&tgfx->sem);
 137         return 0;
 138 }
 139
 140 static void tgfx_close(struct input_dev *dev)
 141 {
 142         struct tgfx *tgfx = input_get_drvdata(dev);
 143
 144         mutex_lock(&tgfx->sem);
 145         if (!--tgfx->used) {
 146                 del_timer_sync(&tgfx->timer);
 147                 parport_write_control(tgfx->pd->port, 0x00);
 148                 parport_release(tgfx->pd);
 149         }
 150         mutex_unlock(&tgfx->sem);
 151 }
 152
 153
 154
 155 /*
 156  * tgfx_probe() probes for tg gamepads.
 157  */
 158
 159 static struct tgfx __init *tgfx_probe(int parport, int *n_buttons, int n_devs)
 160 {
 161         struct tgfx *tgfx;
 162         struct input_dev *input_dev;
 163         struct parport *pp;
 164         struct pardevice *pd;
 165         int i, j;
 166         int err;
 167
 168         pp = parport_find_number(parport);
 169         if (!pp) {
 170                 printk(KERN_ERR "turbografx.c: no such parport\n");
 171                 err = -EINVAL;
 172                 goto err_out;
 173         }
 174
 175         pd = parport_register_device(pp, "turbografx", NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);
 176         if (!pd) {
 177                 printk(KERN_ERR "turbografx.c: parport busy already - lp.o loaded?\n");
 178                 err = -EBUSY;
 179                 goto err_put_pp;
 180         }
 181
 182         tgfx = kzalloc(sizeof(struct tgfx), GFP_KERNEL);
 183         if (!tgfx) {
 184                 printk(KERN_ERR "turbografx.c: Not enough memory\n");
 185                 err = -ENOMEM;
 186                 goto err_unreg_pardev;
 187         }
 188
 189         mutex_init(&tgfx->sem);
 190         tgfx->pd = pd;
 191         init_timer(&tgfx->timer);
 192         tgfx->timer.data = (long) tgfx;
 193         tgfx->timer.function = tgfx_timer;
 194
 195         for (i = 0; i < n_devs; i++) {
 196                 if (n_buttons[i] < 1)
 197                         continue;
 198
 199                 if (n_buttons[i] > 6) {
 200                         printk(KERN_ERR "turbografx.c: Invalid number of buttons %d\n", n_buttons[i]);
 201                         err = -EINVAL;
 202                         goto err_unreg_devs;
 203                 }
 204
 205                 tgfx->dev[i] = input_dev = input_allocate_device();
 206                 if (!input_dev) {
 207                         printk(KERN_ERR "turbografx.c: Not enough memory for input device\n");
 208                         err = -ENOMEM;
 209                         goto err_unreg_devs;
 210                 }
 211
 212                 tgfx->sticks |= (1 << i);
 213                 snprintf(tgfx->name[i], sizeof(tgfx->name[i]),
 214                          "TurboGraFX %d-button Multisystem joystick", n_buttons[i]);
 215                 snprintf(tgfx->phys[i], sizeof(tgfx->phys[i]),
 216                          "%s/input%d", tgfx->pd->port->name, i);
 217
 218                 input_dev->name = tgfx->name[i];
 219                 input_dev->phys = tgfx->phys[i];
 220                 input_dev->id.bustype = BUS_PARPORT;
 221                 input_dev->id.vendor = 0x0003;
 222                 input_dev->id.product = n_buttons[i];
 223                 input_dev->id.version = 0x0100;
 224
 225                 input_set_drvdata(input_dev, tgfx);
 226
 227                 input_dev->open = tgfx_open;
 228                 input_dev->close = tgfx_close;
 229
 230                 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 231                 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
 232                 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
 233
 234                 for (j = 0; j < n_buttons[i]; j++)
 235                         set_bit(tgfx_buttons[j], input_dev->keybit);
 236
 237                 err = input_register_device(tgfx->dev[i]);
 238                 if (err)
 239                         goto err_free_dev;
 240         }
 241
 242         if (!tgfx->sticks) {
 243                 printk(KERN_ERR "turbografx.c: No valid devices specified\n");
 244                 err = -EINVAL;
 245                 goto err_free_tgfx;
 246         }
 247
 248         parport_put_port(pp);
 249         return tgfx;
 250
 251  err_free_dev:
 252         input_free_device(tgfx->dev[i]);
 253  err_unreg_devs:
 254         while (--i >= 0)
 255                 if (tgfx->dev[i])
 256                         input_unregister_device(tgfx->dev[i]);
 257  err_free_tgfx:
 258         kfree(tgfx);
 259  err_unreg_pardev:
 260         parport_unregister_device(pd);
 261  err_put_pp:
 262         parport_put_port(pp);
 263  err_out:
 264         return ERR_PTR(err);
 265 }
 266
 267 static void tgfx_remove(struct tgfx *tgfx)
 268 {
 269         int i;
 270
 271         for (i = 0; i < TGFX_MAX_DEVICES; i++)
 272                 if (tgfx->dev[i])
 273                         input_unregister_device(tgfx->dev[i]);
 274         parport_unregister_device(tgfx->pd);
 275         kfree(tgfx);
 276 }
 277
 278 static int __init tgfx_init(void)
 279 {
 280         int i;
 281         int have_dev = 0;
 282         int err = 0;
 283
 284         for (i = 0; i < TGFX_MAX_PORTS; i++) {
 285                 if (tgfx_cfg[i].nargs == 0 || tgfx_cfg[i].args[0] < 0)
 286                         continue;
 287
 288                 if (tgfx_cfg[i].nargs < 2) {
 289                         printk(KERN_ERR "turbografx.c: at least one joystick must be specified\n");
 290                         err = -EINVAL;
 291                         break;
 292                 }
 293
 294                 tgfx_base[i] = tgfx_probe(tgfx_cfg[i].args[0],
 295                                           tgfx_cfg[i].args + 1,
 296                                           tgfx_cfg[i].nargs - 1);
 297                 if (IS_ERR(tgfx_base[i])) {
 298                         err = PTR_ERR(tgfx_base[i]);
 299                         break;
 300                 }
 301
 302                 have_dev = 1;
 303         }
 304
 305         if (err) {
 306                 while (--i >= 0)
 307                         if (tgfx_base[i])
 308                                 tgfx_remove(tgfx_base[i]);
 309                 return err;
 310         }
 311
 312         return have_dev ? 0 : -ENODEV;
 313 }
 314
 315 static void __exit tgfx_exit(void)
 316 {
 317         int i;
 318
 319         for (i = 0; i < TGFX_MAX_PORTS; i++)
 320                 if (tgfx_base[i])
 321                         tgfx_remove(tgfx_base[i]);
 322 }
 323
 324 module_init(tgfx_init);
 325 module_exit(tgfx_exit);