drivers/input/joystick/guillemot.c

   1 /*
   2  *  Copyright (c) 2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  * Guillemot Digital Interface Protocol driver for Linux
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  *
  24  * Should you need to contact me, the author, you can do so either by
  25  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/module.h>
  32 #include <linux/delay.h>
  33 #include <linux/init.h>
  34 #include <linux/gameport.h>
  35 #include <linux/input.h>
  36 #include <linux/jiffies.h>
  37
  38 #define DRIVER_DESC     "Guillemot Digital joystick driver"
  39
  40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  41 MODULE_DESCRIPTION(DRIVER_DESC);
  42 MODULE_LICENSE("GPL");
  43
  44 #define GUILLEMOT_MAX_START     600     /* 600 us */
  45 #define GUILLEMOT_MAX_STROBE    60      /* 60 us */
  46 #define GUILLEMOT_MAX_LENGTH    17      /* 17 bytes */
  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         int bads;
  71         int reads;
  72         struct guillemot_type *type;
  73         unsigned char length;
  74         char phys[32];
  75 };
  76
  77 static struct guillemot_type guillemot_type[] = {
  78         { 0x00, guillemot_abs_pad, guillemot_btn_pad, 1, "Guillemot Pad" },
  79         { 0 }};
  80
  81 /*
  82  * guillemot_read_packet() reads Guillemot joystick data.
  83  */
  84
  85 static int guillemot_read_packet(struct gameport *gameport, u8 *data)
  86 {
  87         unsigned long flags;
  88         unsigned char u, v;
  89         unsigned int t, s;
  90         int i;
  91
  92         for (i = 0; i < GUILLEMOT_MAX_LENGTH; i++)
  93                 data[i] = 0;
  94
  95         i = 0;
  96         t = gameport_time(gameport, GUILLEMOT_MAX_START);
  97         s = gameport_time(gameport, GUILLEMOT_MAX_STROBE);
  98
  99         local_irq_save(flags);
 100         gameport_trigger(gameport);
 101         v = gameport_read(gameport);
 102
 103         while (t > 0 && i < GUILLEMOT_MAX_LENGTH * 8) {
 104                 t--;
 105                 u = v; v = gameport_read(gameport);
 106                 if (v & ~u & 0x10) {
 107                         data[i >> 3] |= ((v >> 5) & 1) << (i & 7);
 108                         i++;
 109                         t = s;
 110                 }
 111         }
 112
 113         local_irq_restore(flags);
 114
 115         return i;
 116 }
 117
 118 /*
 119  * guillemot_poll() reads and analyzes Guillemot joystick data.
 120  */
 121
 122 static void guillemot_poll(struct gameport *gameport)
 123 {
 124         struct guillemot *guillemot = gameport_get_drvdata(gameport);
 125         struct input_dev *dev = guillemot->dev;
 126         u8 data[GUILLEMOT_MAX_LENGTH];
 127         int i;
 128
 129         guillemot->reads++;
 130
 131         if (guillemot_read_packet(guillemot->gameport, data) != GUILLEMOT_MAX_LENGTH * 8 ||
 132                 data[0] != 0x55 || data[16] != 0xaa) {
 133                 guillemot->bads++;
 134         } else {
 135
 136                 for (i = 0; i < 6 && guillemot->type->abs[i] >= 0; i++)
 137                         input_report_abs(dev, guillemot->type->abs[i], data[i + 5]);
 138
 139                 if (guillemot->type->hat) {
 140                         input_report_abs(dev, ABS_HAT0X, guillemot_hat_to_axis[data[4] >> 4].x);
 141                         input_report_abs(dev, ABS_HAT0Y, guillemot_hat_to_axis[data[4] >> 4].y);
 142                 }
 143
 144                 for (i = 0; i < 16 && guillemot->type->btn[i] >= 0; i++)
 145                         input_report_key(dev, guillemot->type->btn[i], (data[2 + (i >> 3)] >> (i & 7)) & 1);
 146         }
 147
 148         input_sync(dev);
 149 }
 150
 151 /*
 152  * guillemot_open() is a callback from the input open routine.
 153  */
 154
 155 static int guillemot_open(struct input_dev *dev)
 156 {
 157         struct guillemot *guillemot = input_get_drvdata(dev);
 158
 159         gameport_start_polling(guillemot->gameport);
 160         return 0;
 161 }
 162
 163 /*
 164  * guillemot_close() is a callback from the input close routine.
 165  */
 166
 167 static void guillemot_close(struct input_dev *dev)
 168 {
 169         struct guillemot *guillemot = input_get_drvdata(dev);
 170
 171         gameport_stop_polling(guillemot->gameport);
 172 }
 173
 174 /*
 175  * guillemot_connect() probes for Guillemot joysticks.
 176  */
 177
 178 static int guillemot_connect(struct gameport *gameport, struct gameport_driver *drv)
 179 {
 180         struct guillemot *guillemot;
 181         struct input_dev *input_dev;
 182         u8 data[GUILLEMOT_MAX_LENGTH];
 183         int i, t;
 184         int err;
 185
 186         guillemot = kzalloc(sizeof(struct guillemot), GFP_KERNEL);
 187         input_dev = input_allocate_device();
 188         if (!guillemot || !input_dev) {
 189                 err = -ENOMEM;
 190                 goto fail1;
 191         }
 192
 193         guillemot->gameport = gameport;
 194         guillemot->dev = input_dev;
 195
 196         gameport_set_drvdata(gameport, guillemot);
 197
 198         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 199         if (err)
 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                 err = -ENODEV;
 206                 goto fail2;
 207         }
 208
 209         for (i = 0; guillemot_type[i].name; i++)
 210                 if (guillemot_type[i].id == data[11])
 211                         break;
 212
 213         if (!guillemot_type[i].name) {
 214                 printk(KERN_WARNING "guillemot.c: Unknown joystick on %s. [ %02x%02x:%04x, ver %d.%02d ]\n",
 215                         gameport->phys, data[12], data[13], data[11], data[14], data[15]);
 216                 err = -ENODEV;
 217                 goto fail2;
 218         }
 219
 220         gameport_set_poll_handler(gameport, guillemot_poll);
 221         gameport_set_poll_interval(gameport, 20);
 222
 223         snprintf(guillemot->phys, sizeof(guillemot->phys), "%s/input0", gameport->phys);
 224         guillemot->type = guillemot_type + i;
 225
 226         input_dev->name = guillemot_type[i].name;
 227         input_dev->phys = guillemot->phys;
 228         input_dev->id.bustype = BUS_GAMEPORT;
 229         input_dev->id.vendor = GAMEPORT_ID_VENDOR_GUILLEMOT;
 230         input_dev->id.product = guillemot_type[i].id;
 231         input_dev->id.version = (int)data[14] << 8 | data[15];
 232         input_dev->dev.parent = &gameport->dev;
 233
 234         input_set_drvdata(input_dev, guillemot);
 235
 236         input_dev->open = guillemot_open;
 237         input_dev->close = guillemot_close;
 238
 239         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 240
 241         for (i = 0; (t = guillemot->type->abs[i]) >= 0; i++)
 242                 input_set_abs_params(input_dev, t, 0, 255, 0, 0);
 243
 244         if (guillemot->type->hat) {
 245                 input_set_abs_params(input_dev, ABS_HAT0X, -1, 1, 0, 0);
 246                 input_set_abs_params(input_dev, ABS_HAT0Y, -1, 1, 0, 0);
 247         }
 248
 249         for (i = 0; (t = guillemot->type->btn[i]) >= 0; i++)
 250                 set_bit(t, input_dev->keybit);
 251
 252         err = input_register_device(guillemot->dev);
 253         if (err)
 254                 goto fail2;
 255
 256         return 0;
 257
 258 fail2:  gameport_close(gameport);
 259 fail1:  gameport_set_drvdata(gameport, NULL);
 260         input_free_device(input_dev);
 261         kfree(guillemot);
 262         return err;
 263 }
 264
 265 static void guillemot_disconnect(struct gameport *gameport)
 266 {
 267         struct guillemot *guillemot = gameport_get_drvdata(gameport);
 268
 269         printk(KERN_INFO "guillemot.c: Failed %d reads out of %d on %s\n", guillemot->reads, guillemot->bads, guillemot->phys);
 270         input_unregister_device(guillemot->dev);
 271         gameport_close(gameport);
 272         kfree(guillemot);
 273 }
 274
 275 static struct gameport_driver guillemot_drv = {
 276         .driver         = {
 277                 .name   = "guillemot",
 278         },
 279         .description    = DRIVER_DESC,
 280         .connect        = guillemot_connect,
 281         .disconnect     = guillemot_disconnect,
 282 };
 283
 284 static int __init guillemot_init(void)
 285 {
 286         return gameport_register_driver(&guillemot_drv);
 287 }
 288
 289 static void __exit guillemot_exit(void)
 290 {
 291         gameport_unregister_driver(&guillemot_drv);
 292 }
 293
 294 module_init(guillemot_init);
 295 module_exit(guillemot_exit);