drivers/input/mouse/sermouse.c

   1 /*
   2  *  Copyright (c) 1999-2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  *  Serial mouse 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/delay.h>
  30 #include <linux/module.h>
  31 #include <linux/slab.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/input.h>
  34 #include <linux/serio.h>
  35 #include <linux/init.h>
  36
  37 #define DRIVER_DESC     "Serial mouse driver"
  38
  39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  40 MODULE_DESCRIPTION(DRIVER_DESC);
  41 MODULE_LICENSE("GPL");
  42
  43 static const char *sermouse_protocols[] = { "None", "Mouse Systems Mouse", "Sun Mouse", "Microsoft Mouse",
  44                                         "Logitech M+ Mouse", "Microsoft MZ Mouse", "Logitech MZ+ Mouse",
  45                                         "Logitech MZ++ Mouse"};
  46
  47 struct sermouse {
  48         struct input_dev *dev;
  49         signed char buf[8];
  50         unsigned char count;
  51         unsigned char type;
  52         unsigned long last;
  53         char phys[32];
  54 };
  55
  56 /*
  57  * sermouse_process_msc() analyzes the incoming MSC/Sun bytestream and
  58  * applies some prediction to the data, resulting in 96 updates per
  59  * second, which is as good as a PS/2 or USB mouse.
  60  */
  61
  62 static void sermouse_process_msc(struct sermouse *sermouse, signed char data)
  63 {
  64         struct input_dev *dev = sermouse->dev;
  65         signed char *buf = sermouse->buf;
  66
  67         switch (sermouse->count) {
  68
  69                 case 0:
  70                         if ((data & 0xf8) != 0x80)
  71                                 return;
  72                         input_report_key(dev, BTN_LEFT,   !(data & 4));
  73                         input_report_key(dev, BTN_RIGHT,  !(data & 1));
  74                         input_report_key(dev, BTN_MIDDLE, !(data & 2));
  75                         break;
  76
  77                 case 1:
  78                 case 3:
  79                         input_report_rel(dev, REL_X, data / 2);
  80                         input_report_rel(dev, REL_Y, -buf[1]);
  81                         buf[0] = data - data / 2;
  82                         break;
  83
  84                 case 2:
  85                 case 4:
  86                         input_report_rel(dev, REL_X, buf[0]);
  87                         input_report_rel(dev, REL_Y, buf[1] - data);
  88                         buf[1] = data / 2;
  89                         break;
  90         }
  91
  92         input_sync(dev);
  93
  94         if (++sermouse->count == 5)
  95                 sermouse->count = 0;
  96 }
  97
  98 /*
  99  * sermouse_process_ms() anlyzes the incoming MS(Z/+/++) bytestream and
 100  * generates events. With prediction it gets 80 updates/sec, assuming
 101  * standard 3-byte packets and 1200 bps.
 102  */
 103
 104 static void sermouse_process_ms(struct sermouse *sermouse, signed char data)
 105 {
 106         struct input_dev *dev = sermouse->dev;
 107         signed char *buf = sermouse->buf;
 108
 109         if (data & 0x40)
 110                 sermouse->count = 0;
 111         else if (sermouse->count == 0)
 112                 return;
 113
 114         switch (sermouse->count) {
 115
 116                 case 0:
 117                         buf[1] = data;
 118                         input_report_key(dev, BTN_LEFT,   (data >> 5) & 1);
 119                         input_report_key(dev, BTN_RIGHT,  (data >> 4) & 1);
 120                         break;
 121
 122                 case 1:
 123                         buf[2] = data;
 124                         data = (signed char) (((buf[1] << 6) & 0xc0) | (data & 0x3f));
 125                         input_report_rel(dev, REL_X, data / 2);
 126                         input_report_rel(dev, REL_Y, buf[4]);
 127                         buf[3] = data - data / 2;
 128                         break;
 129
 130                 case 2:
 131                         /* Guessing the state of the middle button on 3-button MS-protocol mice - ugly. */
 132                         if ((sermouse->type == SERIO_MS) && !data && !buf[2] && !((buf[0] & 0xf0) ^ buf[1]))
 133                                 input_report_key(dev, BTN_MIDDLE, !test_bit(BTN_MIDDLE, dev->key));
 134                         buf[0] = buf[1];
 135
 136                         data = (signed char) (((buf[1] << 4) & 0xc0) | (data & 0x3f));
 137                         input_report_rel(dev, REL_X, buf[3]);
 138                         input_report_rel(dev, REL_Y, data - buf[4]);
 139                         buf[4] = data / 2;
 140                         break;
 141
 142                 case 3:
 143
 144                         switch (sermouse->type) {
 145
 146                                 case SERIO_MS:
 147                                          sermouse->type = SERIO_MP;
 148
 149                                 case SERIO_MP:
 150                                         if ((data >> 2) & 3) break;     /* M++ Wireless Extension packet. */
 151                                         input_report_key(dev, BTN_MIDDLE, (data >> 5) & 1);
 152                                         input_report_key(dev, BTN_SIDE,   (data >> 4) & 1);
 153                                         break;
 154
 155                                 case SERIO_MZP:
 156                                 case SERIO_MZPP:
 157                                         input_report_key(dev, BTN_SIDE,   (data >> 5) & 1);
 158
 159                                 case SERIO_MZ:
 160                                         input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);
 161                                         input_report_rel(dev, REL_WHEEL,  (data & 8) - (data & 7));
 162                                         break;
 163                         }
 164
 165                         break;
 166
 167                 case 4:
 168                 case 6: /* MZ++ packet type. We can get these bytes for M++ too but we ignore them later. */
 169                         buf[1] = (data >> 2) & 0x0f;
 170                         break;
 171
 172                 case 5:
 173                 case 7: /* Ignore anything besides MZ++ */
 174                         if (sermouse->type != SERIO_MZPP)
 175                                 break;
 176
 177                         switch (buf[1]) {
 178
 179                                 case 1: /* Extra mouse info */
 180
 181                                         input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
 182                                         input_report_key(dev, BTN_EXTRA, (data >> 5) & 1);
 183                                         input_report_rel(dev, data & 0x80 ? REL_HWHEEL : REL_WHEEL, (data & 7) - (data & 8));
 184
 185                                         break;
 186
 187                                 default: /* We don't decode anything else yet. */
 188
 189                                         printk(KERN_WARNING
 190                                                 "sermouse.c: Received MZ++ packet %x, don't know how to handle.\n", buf[1]);
 191                                         break;
 192                         }
 193
 194                         break;
 195         }
 196
 197         input_sync(dev);
 198
 199         sermouse->count++;
 200 }
 201
 202 /*
 203  * sermouse_interrupt() handles incoming characters, either gathering them into
 204  * packets or passing them to the command routine as command output.
 205  */
 206
 207 static irqreturn_t sermouse_interrupt(struct serio *serio,
 208                 unsigned char data, unsigned int flags)
 209 {
 210         struct sermouse *sermouse = serio_get_drvdata(serio);
 211
 212         if (time_after(jiffies, sermouse->last + HZ/10))
 213                 sermouse->count = 0;
 214
 215         sermouse->last = jiffies;
 216
 217         if (sermouse->type > SERIO_SUN)
 218                 sermouse_process_ms(sermouse, data);
 219         else
 220                 sermouse_process_msc(sermouse, data);
 221
 222         return IRQ_HANDLED;
 223 }
 224
 225 /*
 226  * sermouse_disconnect() cleans up after we don't want talk
 227  * to the mouse anymore.
 228  */
 229
 230 static void sermouse_disconnect(struct serio *serio)
 231 {
 232         struct sermouse *sermouse = serio_get_drvdata(serio);
 233
 234         serio_close(serio);
 235         serio_set_drvdata(serio, NULL);
 236         input_unregister_device(sermouse->dev);
 237         kfree(sermouse);
 238 }
 239
 240 /*
 241  * sermouse_connect() is a callback form the serio module when
 242  * an unhandled serio port is found.
 243  */
 244
 245 static int sermouse_connect(struct serio *serio, struct serio_driver *drv)
 246 {
 247         struct sermouse *sermouse;
 248         struct input_dev *input_dev;
 249         unsigned char c = serio->id.extra;
 250         int err = -ENOMEM;
 251
 252         sermouse = kzalloc(sizeof(struct sermouse), GFP_KERNEL);
 253         input_dev = input_allocate_device();
 254         if (!sermouse || !input_dev)
 255                 goto fail1;
 256
 257         sermouse->dev = input_dev;
 258         snprintf(sermouse->phys, sizeof(sermouse->phys), "%s/input0", serio->phys);
 259         sermouse->type = serio->id.proto;
 260
 261         input_dev->name = sermouse_protocols[sermouse->type];
 262         input_dev->phys = sermouse->phys;
 263         input_dev->id.bustype = BUS_RS232;
 264         input_dev->id.vendor  = sermouse->type;
 265         input_dev->id.product = c;
 266         input_dev->id.version = 0x0100;
 267         input_dev->dev.parent = &serio->dev;
 268
 269         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 270         input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
 271                 BIT_MASK(BTN_RIGHT);
 272         input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 273
 274         if (c & 0x01) set_bit(BTN_MIDDLE, input_dev->keybit);
 275         if (c & 0x02) set_bit(BTN_SIDE, input_dev->keybit);
 276         if (c & 0x04) set_bit(BTN_EXTRA, input_dev->keybit);
 277         if (c & 0x10) set_bit(REL_WHEEL, input_dev->relbit);
 278         if (c & 0x20) set_bit(REL_HWHEEL, input_dev->relbit);
 279
 280         serio_set_drvdata(serio, sermouse);
 281
 282         err = serio_open(serio, drv);
 283         if (err)
 284                 goto fail2;
 285
 286         err = input_register_device(sermouse->dev);
 287         if (err)
 288                 goto fail3;
 289
 290         return 0;
 291
 292  fail3: serio_close(serio);
 293  fail2: serio_set_drvdata(serio, NULL);
 294  fail1: input_free_device(input_dev);
 295         kfree(sermouse);
 296         return err;
 297 }
 298
 299 static struct serio_device_id sermouse_serio_ids[] = {
 300         {
 301                 .type   = SERIO_RS232,
 302                 .proto  = SERIO_MSC,
 303                 .id     = SERIO_ANY,
 304                 .extra  = SERIO_ANY,
 305         },
 306         {
 307                 .type   = SERIO_RS232,
 308                 .proto  = SERIO_SUN,
 309                 .id     = SERIO_ANY,
 310                 .extra  = SERIO_ANY,
 311         },
 312         {
 313                 .type   = SERIO_RS232,
 314                 .proto  = SERIO_MS,
 315                 .id     = SERIO_ANY,
 316                 .extra  = SERIO_ANY,
 317         },
 318         {
 319                 .type   = SERIO_RS232,
 320                 .proto  = SERIO_MP,
 321                 .id     = SERIO_ANY,
 322                 .extra  = SERIO_ANY,
 323         },
 324         {
 325                 .type   = SERIO_RS232,
 326                 .proto  = SERIO_MZ,
 327                 .id     = SERIO_ANY,
 328                 .extra  = SERIO_ANY,
 329         },
 330         {
 331                 .type   = SERIO_RS232,
 332                 .proto  = SERIO_MZP,
 333                 .id     = SERIO_ANY,
 334                 .extra  = SERIO_ANY,
 335         },
 336         {
 337                 .type   = SERIO_RS232,
 338                 .proto  = SERIO_MZPP,
 339                 .id     = SERIO_ANY,
 340                 .extra  = SERIO_ANY,
 341         },
 342         { 0 }
 343 };
 344
 345 MODULE_DEVICE_TABLE(serio, sermouse_serio_ids);
 346
 347 static struct serio_driver sermouse_drv = {
 348         .driver         = {
 349                 .name   = "sermouse",
 350         },
 351         .description    = DRIVER_DESC,
 352         .id_table       = sermouse_serio_ids,
 353         .interrupt      = sermouse_interrupt,
 354         .connect        = sermouse_connect,
 355         .disconnect     = sermouse_disconnect,
 356 };
 357
 358 static int __init sermouse_init(void)
 359 {
 360         return serio_register_driver(&sermouse_drv);
 361 }
 362
 363 static void __exit sermouse_exit(void)
 364 {
 365         serio_unregister_driver(&sermouse_drv);
 366 }
 367
 368 module_init(sermouse_init);
 369 module_exit(sermouse_exit);