drivers/input/joystick/guillemot.c

   1 /*
   2  * $Id: guillemot.c,v 1.10 2002/01/22 20:28:12 vojtech Exp $
   3  *
   4  *  Copyright (c) 2001 Vojtech Pavlik
   5  */
   6
   7 /*
   8  * Guillemot Digital Interface Protocol driver for Linux
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  * Should you need to contact me, the author, you can do so either by
  27  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  28  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/module.h>
  34 #include <linux/delay.h>
  35 #include <linux/init.h>
  36 #include <linux/gameport.h>
  37 #include <linux/input.h>
  38
  39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  40 MODULE_DESCRIPTION("Guillemot Digital joystick driver");
  41 MODULE_LICENSE("GPL");
  42
  43 #define GUILLEMOT_MAX_START     600     /* 600 us */
  44 #define GUILLEMOT_MAX_STROBE    60      /* 60 us */
  45 #define GUILLEMOT_MAX_LENGTH    17      /* 17 bytes */
  46 #define GUILLEMOT_REFRESH_TIME  HZ/50   /* 20 ms */
  47
  48 static short guillemot_abs_pad[] =
  49         { ABS_X, ABS_Y, ABS_THROTTLE, ABS_RUDDER, -1 };
  50
  51 static short guillemot_btn_pad[] =
  52         { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_MODE, BTN_SELECT, -1 };
  53
  54 static struct {
  55         int x;
  56         int y;
  57 } guillemot_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
  58
  59 struct guillemot_type {
  60         unsigned char id;
  61         short *abs;
  62         short *btn;
  63         int hat;
  64         char *name;
  65 };
  66
  67 struct guillemot {
  68         struct gameport *gameport;
  69         struct input_dev dev;
  70         struct timer_list timer;
  71         int used;
  72         int bads;
  73         int reads;
  74         struct guillemot_type *type;
  75         unsigned char length;
  76         char phys[32];
  77 };
  78
  79 static struct guillemot_type guillemot_type[] = {
  80         { 0x00, guillemot_abs_pad, guillemot_btn_pad, 1, "Guillemot Pad" },
  81         { 0 }};
  82
  83 /*
  84  * guillemot_read_packet() reads Guillemot joystick data.
  85  */
  86
  87 static int guillemot_read_packet(struct gameport *gameport, u8 *data)
  88 {
  89         unsigned long flags;
  90         unsigned char u, v;
  91         unsigned int t, s;
  92         int i;
  93
  94         for (i = 0; i < GUILLEMOT_MAX_LENGTH; i++)
  95                 data[i] = 0;
  96
  97         i = 0;
  98         t = gameport_time(gameport, GUILLEMOT_MAX_START);
  99         s = gameport_time(gameport, GUILLEMOT_MAX_STROBE);
 100
 101         local_irq_save(flags);
 102         gameport_trigger(gameport);
 103         v = gameport_read(gameport);
 104
 105         while (t > 0 && i < GUILLEMOT_MAX_LENGTH * 8) {
 106                 t--;
 107                 u = v; v = gameport_read(gameport);
 108                 if (v & ~u & 0x10) {
 109                         data[i >> 3] |= ((v >> 5) & 1) << (i & 7);
 110                         i++;
 111                         t = s;
 112                 }
 113         }
 114
 115         local_irq_restore(flags);
 116
 117         return i;
 118 }
 119
 120 /*
 121  * guillemot_timer() reads and analyzes Guillemot joystick data.
 122  */
 123
 124 static void guillemot_timer(unsigned long private)
 125 {
 126         struct guillemot *guillemot = (struct guillemot *) private;
 127         struct input_dev *dev = &guillemot->dev;
 128         u8 data[GUILLEMOT_MAX_LENGTH];
 129         int i;
 130
 131         guillemot->reads++;
 132
 133         if (guillemot_read_packet(guillemot->gameport, data) != GUILLEMOT_MAX_LENGTH * 8 ||
 134                 data[0] != 0x55 || data[16] != 0xaa) {
 135                 guillemot->bads++;
 136         } else {
 137
 138                 for (i = 0; i < 6 && guillemot->type->abs[i] >= 0; i++)
 139                         input_report_abs(dev, guillemot->type->abs[i], data[i + 5]);
 140
 141                 if (guillemot->type->hat) {
 142                         input_report_abs(dev, ABS_HAT0X, guillemot_hat_to_axis[data[4] >> 4].x);
 143                         input_report_abs(dev, ABS_HAT0Y, guillemot_hat_to_axis[data[4] >> 4].y);
 144                 }
 145
 146                 for (i = 0; i < 16 && guillemot->type->btn[i] >= 0; i++)
 147                         input_report_key(dev, guillemot->type->btn[i], (data[2 + (i >> 3)] >> (i & 7)) & 1);
 148         }
 149
 150         input_sync(dev);
 151
 152         mod_timer(&guillemot->timer, jiffies + GUILLEMOT_REFRESH_TIME);
 153 }
 154
 155 /*
 156  * guillemot_open() is a callback from the input open routine.
 157  */
 158
 159 static int guillemot_open(struct input_dev *dev)
 160 {
 161         struct guillemot *guillemot = dev->private;
 162         if (!guillemot->used++)
 163                 mod_timer(&guillemot->timer, jiffies + GUILLEMOT_REFRESH_TIME);
 164         return 0;
 165 }
 166
 167 /*
 168  * guillemot_close() is a callback from the input close routine.
 169  */
 170
 171 static void guillemot_close(struct input_dev *dev)
 172 {
 173         struct guillemot *guillemot = dev->private;
 174         if (!--guillemot->used)
 175                 del_timer(&guillemot->timer);
 176 }
 177
 178 /*
 179  * guillemot_connect() probes for Guillemot joysticks.
 180  */
 181
 182 static void guillemot_connect(struct gameport *gameport, struct gameport_dev *dev)
 183 {
 184         struct guillemot *guillemot;
 185         u8 data[GUILLEMOT_MAX_LENGTH];
 186         int i, t;
 187
 188         if (!(guillemot = kmalloc(sizeof(struct guillemot), GFP_KERNEL)))
 189                 return;
 190         memset(guillemot, 0, sizeof(struct guillemot));
 191
 192         gameport->private = guillemot;
 193
 194         guillemot->gameport = gameport;
 195         init_timer(&guillemot->timer);
 196         guillemot->timer.data = (long) guillemot;
 197         guillemot->timer.function = guillemot_timer;
 198
 199         if (gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
 200                 goto fail1;
 201
 202         i = guillemot_read_packet(gameport, data);
 203
 204         if (i != GUILLEMOT_MAX_LENGTH * 8 || data[0] != 0x55 || data[16] != 0xaa)
 205                 goto fail2;
 206
 207         for (i = 0; guillemot_type[i].name; i++)
 208                 if (guillemot_type[i].id == data[11])
 209                         break;
 210
 211         if (!guillemot_type[i].name) {
 212                 printk(KERN_WARNING "guillemot.c: Unknown joystick on %s. [ %02x%02x:%04x, ver %d.%02d ]\n",
 213                         gameport->phys, data[12], data[13], data[11], data[14], data[15]);
 214                 goto fail2;
 215         }
 216
 217         sprintf(guillemot->phys, "%s/input0", gameport->phys);
 218
 219         guillemot->type = guillemot_type + i;
 220
 221         guillemot->dev.private = guillemot;
 222         guillemot->dev.open = guillemot_open;
 223         guillemot->dev.close = guillemot_close;
 224
 225         guillemot->dev.name = guillemot_type[i].name;
 226         guillemot->dev.phys = guillemot->phys;
 227         guillemot->dev.id.bustype = BUS_GAMEPORT;
 228         guillemot->dev.id.vendor = GAMEPORT_ID_VENDOR_GUILLEMOT;
 229         guillemot->dev.id.product = guillemot_type[i].id;
 230         guillemot->dev.id.version = (int)data[14] << 8 | data[15];
 231
 232         guillemot->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 233
 234         for (i = 0; (t = guillemot->type->abs[i]) >= 0; i++) {
 235                 set_bit(t, guillemot->dev.absbit);
 236                 guillemot->dev.absmin[t] = 0;
 237                 guillemot->dev.absmax[t] = 255;
 238         }
 239
 240         if (guillemot->type->hat)
 241                 for (i = 0; i < 2; i++) {
 242                         t = ABS_HAT0X + i;
 243                         set_bit(t, guillemot->dev.absbit);
 244                         guillemot->dev.absmin[t] = -1;
 245                         guillemot->dev.absmax[t] = 1;
 246                 }
 247
 248         for (i = 0; (t = guillemot->type->btn[i]) >= 0; i++)
 249                 set_bit(t, guillemot->dev.keybit);
 250
 251         input_register_device(&guillemot->dev);
 252         printk(KERN_INFO "input: %s ver %d.%02d on %s\n",
 253                 guillemot->type->name, data[14], data[15], gameport->phys);
 254
 255         return;
 256 fail2:  gameport_close(gameport);
 257 fail1:  kfree(guillemot);
 258 }
 259
 260 static void guillemot_disconnect(struct gameport *gameport)
 261 {
 262         struct guillemot *guillemot = gameport->private;
 263         printk(KERN_INFO "guillemot.c: Failed %d reads out of %d on %s\n", guillemot->reads, guillemot->bads, guillemot->phys);
 264         input_unregister_device(&guillemot->dev);
 265         gameport_close(gameport);
 266         kfree(guillemot);
 267 }
 268
 269 static struct gameport_dev guillemot_dev = {
 270         .connect =      guillemot_connect,
 271         .disconnect =   guillemot_disconnect,
 272 };
 273
 274 int __init guillemot_init(void)
 275 {
 276         gameport_register_device(&guillemot_dev);
 277         return 0;
 278 }
 279
 280 void __exit guillemot_exit(void)
 281 {
 282         gameport_unregister_device(&guillemot_dev);
 283 }
 284
 285 module_init(guillemot_init);
 286 module_exit(guillemot_exit);