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
  25 #include <linux/kernel.h>
  26 #include <linux/slab.h>
  27 #include <linux/module.h>
  28 #include <linux/delay.h>
  29 #include <linux/gameport.h>
  30 #include <linux/input.h>
  31 #include <linux/jiffies.h>
  32
  33 #define DRIVER_DESC     "Guillemot Digital joystick driver"
  34
  35 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  36 MODULE_DESCRIPTION(DRIVER_DESC);
  37 MODULE_LICENSE("GPL");
  38
  39 #define GUILLEMOT_MAX_START     600     /* 600 us */
  40 #define GUILLEMOT_MAX_STROBE    60      /* 60 us */
  41 #define GUILLEMOT_MAX_LENGTH    17      /* 17 bytes */
  42
  43 static short guillemot_abs_pad[] =
  44         { ABS_X, ABS_Y, ABS_THROTTLE, ABS_RUDDER, -1 };
  45
  46 static short guillemot_btn_pad[] =
  47         { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_MODE, BTN_SELECT, -1 };
  48
  49 static struct {
  50         int x;
  51         int y;
  52 } guillemot_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
  53
  54 struct guillemot_type {
  55         unsigned char id;
  56         short *abs;
  57         short *btn;
  58         int hat;
  59         char *name;
  60 };
  61
  62 struct guillemot {
  63         struct gameport *gameport;
  64         struct input_dev *dev;
  65         int bads;
  66         int reads;
  67         struct guillemot_type *type;
  68         unsigned char length;
  69         char phys[32];
  70 };
  71
  72 static struct guillemot_type guillemot_type[] = {
  73         { 0x00, guillemot_abs_pad, guillemot_btn_pad, 1, "Guillemot Pad" },
  74         { 0 }};
  75
  76 /*
  77  * guillemot_read_packet() reads Guillemot joystick data.
  78  */
  79
  80 static int guillemot_read_packet(struct gameport *gameport, u8 *data)
  81 {
  82         unsigned long flags;
  83         unsigned char u, v;
  84         unsigned int t, s;
  85         int i;
  86
  87         for (i = 0; i < GUILLEMOT_MAX_LENGTH; i++)
  88                 data[i] = 0;
  89
  90         i = 0;
  91         t = gameport_time(gameport, GUILLEMOT_MAX_START);
  92         s = gameport_time(gameport, GUILLEMOT_MAX_STROBE);
  93
  94         local_irq_save(flags);
  95         gameport_trigger(gameport);
  96         v = gameport_read(gameport);
  97
  98         while (t > 0 && i < GUILLEMOT_MAX_LENGTH * 8) {
  99                 t--;
 100                 u = v; v = gameport_read(gameport);
 101                 if (v & ~u & 0x10) {
 102                         data[i >> 3] |= ((v >> 5) & 1) << (i & 7);
 103                         i++;
 104                         t = s;
 105                 }
 106         }
 107
 108         local_irq_restore(flags);
 109
 110         return i;
 111 }
 112
 113 /*
 114  * guillemot_poll() reads and analyzes Guillemot joystick data.
 115  */
 116
 117 static void guillemot_poll(struct gameport *gameport)
 118 {
 119         struct guillemot *guillemot = gameport_get_drvdata(gameport);
 120         struct input_dev *dev = guillemot->dev;
 121         u8 data[GUILLEMOT_MAX_LENGTH];
 122         int i;
 123
 124         guillemot->reads++;
 125
 126         if (guillemot_read_packet(guillemot->gameport, data) != GUILLEMOT_MAX_LENGTH * 8 ||
 127                 data[0] != 0x55 || data[16] != 0xaa) {
 128                 guillemot->bads++;
 129         } else {
 130
 131                 for (i = 0; i < 6 && guillemot->type->abs[i] >= 0; i++)
 132                         input_report_abs(dev, guillemot->type->abs[i], data[i + 5]);
 133
 134                 if (guillemot->type->hat) {
 135                         input_report_abs(dev, ABS_HAT0X, guillemot_hat_to_axis[data[4] >> 4].x);
 136                         input_report_abs(dev, ABS_HAT0Y, guillemot_hat_to_axis[data[4] >> 4].y);
 137                 }
 138
 139                 for (i = 0; i < 16 && guillemot->type->btn[i] >= 0; i++)
 140                         input_report_key(dev, guillemot->type->btn[i], (data[2 + (i >> 3)] >> (i & 7)) & 1);
 141         }
 142
 143         input_sync(dev);
 144 }
 145
 146 /*
 147  * guillemot_open() is a callback from the input open routine.
 148  */
 149
 150 static int guillemot_open(struct input_dev *dev)
 151 {
 152         struct guillemot *guillemot = input_get_drvdata(dev);
 153
 154         gameport_start_polling(guillemot->gameport);
 155         return 0;
 156 }
 157
 158 /*
 159  * guillemot_close() is a callback from the input close routine.
 160  */
 161
 162 static void guillemot_close(struct input_dev *dev)
 163 {
 164         struct guillemot *guillemot = input_get_drvdata(dev);
 165
 166         gameport_stop_polling(guillemot->gameport);
 167 }
 168
 169 /*
 170  * guillemot_connect() probes for Guillemot joysticks.
 171  */
 172
 173 static int guillemot_connect(struct gameport *gameport, struct gameport_driver *drv)
 174 {
 175         struct guillemot *guillemot;
 176         struct input_dev *input_dev;
 177         u8 data[GUILLEMOT_MAX_LENGTH];
 178         int i, t;
 179         int err;
 180
 181         guillemot = kzalloc(sizeof(struct guillemot), GFP_KERNEL);
 182         input_dev = input_allocate_device();
 183         if (!guillemot || !input_dev) {
 184                 err = -ENOMEM;
 185                 goto fail1;
 186         }
 187
 188         guillemot->gameport = gameport;
 189         guillemot->dev = input_dev;
 190
 191         gameport_set_drvdata(gameport, guillemot);
 192
 193         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 194         if (err)
 195                 goto fail1;
 196
 197         i = guillemot_read_packet(gameport, data);
 198
 199         if (i != GUILLEMOT_MAX_LENGTH * 8 || data[0] != 0x55 || data[16] != 0xaa) {
 200                 err = -ENODEV;
 201                 goto fail2;
 202         }
 203
 204         for (i = 0; guillemot_type[i].name; i++)
 205                 if (guillemot_type[i].id == data[11])
 206                         break;
 207
 208         if (!guillemot_type[i].name) {
 209                 printk(KERN_WARNING "guillemot.c: Unknown joystick on %s. [ %02x%02x:%04x, ver %d.%02d ]\n",
 210                         gameport->phys, data[12], data[13], data[11], data[14], data[15]);
 211                 err = -ENODEV;
 212                 goto fail2;
 213         }
 214
 215         gameport_set_poll_handler(gameport, guillemot_poll);
 216         gameport_set_poll_interval(gameport, 20);
 217
 218         snprintf(guillemot->phys, sizeof(guillemot->phys), "%s/input0", gameport->phys);
 219         guillemot->type = guillemot_type + i;
 220
 221         input_dev->name = guillemot_type[i].name;
 222         input_dev->phys = guillemot->phys;
 223         input_dev->id.bustype = BUS_GAMEPORT;
 224         input_dev->id.vendor = GAMEPORT_ID_VENDOR_GUILLEMOT;
 225         input_dev->id.product = guillemot_type[i].id;
 226         input_dev->id.version = (int)data[14] << 8 | data[15];
 227         input_dev->dev.parent = &gameport->dev;
 228
 229         input_set_drvdata(input_dev, guillemot);
 230
 231         input_dev->open = guillemot_open;
 232         input_dev->close = guillemot_close;
 233
 234         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 235
 236         for (i = 0; (t = guillemot->type->abs[i]) >= 0; i++)
 237                 input_set_abs_params(input_dev, t, 0, 255, 0, 0);
 238
 239         if (guillemot->type->hat) {
 240                 input_set_abs_params(input_dev, ABS_HAT0X, -1, 1, 0, 0);
 241                 input_set_abs_params(input_dev, ABS_HAT0Y, -1, 1, 0, 0);
 242         }
 243
 244         for (i = 0; (t = guillemot->type->btn[i]) >= 0; i++)
 245                 set_bit(t, input_dev->keybit);
 246
 247         err = input_register_device(guillemot->dev);
 248         if (err)
 249                 goto fail2;
 250
 251         return 0;
 252
 253 fail2:  gameport_close(gameport);
 254 fail1:  gameport_set_drvdata(gameport, NULL);
 255         input_free_device(input_dev);
 256         kfree(guillemot);
 257         return err;
 258 }
 259
 260 static void guillemot_disconnect(struct gameport *gameport)
 261 {
 262         struct guillemot *guillemot = gameport_get_drvdata(gameport);
 263
 264         printk(KERN_INFO "guillemot.c: Failed %d reads out of %d on %s\n", guillemot->reads, guillemot->bads, guillemot->phys);
 265         input_unregister_device(guillemot->dev);
 266         gameport_close(gameport);
 267         kfree(guillemot);
 268 }
 269
 270 static struct gameport_driver guillemot_drv = {
 271         .driver         = {
 272                 .name   = "guillemot",
 273         },
 274         .description    = DRIVER_DESC,
 275         .connect        = guillemot_connect,
 276         .disconnect     = guillemot_disconnect,
 277 };
 278
 279 module_gameport_driver(guillemot_drv);