drivers/input/mouse/sermouse.c

   1 /*
   2  * $Id: sermouse.c,v 1.17 2002/03/13 10:03:43 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2001 Vojtech Pavlik
   5  */
   6
   7 /*
   8  *  Serial mouse 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/delay.h>
  32 #include <linux/module.h>
  33 #include <linux/slab.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/input.h>
  36 #include <linux/serio.h>
  37 #include <linux/init.h>
  38
  39 #define DRIVER_DESC     "Serial mouse driver"
  40
  41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  42 MODULE_DESCRIPTION(DRIVER_DESC);
  43 MODULE_LICENSE("GPL");
  44
  45 static char *sermouse_protocols[] = { "None", "Mouse Systems Mouse", "Sun Mouse", "Microsoft Mouse",
  46                                         "Logitech M+ Mouse", "Microsoft MZ Mouse", "Logitech MZ+ Mouse",
  47                                         "Logitech MZ++ Mouse"};
  48
  49 struct sermouse {
  50         struct input_dev *dev;
  51         signed char buf[8];
  52         unsigned char count;
  53         unsigned char type;
  54         unsigned long last;
  55         char phys[32];
  56 };
  57
  58 /*
  59  * sermouse_process_msc() analyzes the incoming MSC/Sun bytestream and
  60  * applies some prediction to the data, resulting in 96 updates per
  61  * second, which is as good as a PS/2 or USB mouse.
  62  */
  63
  64 static void sermouse_process_msc(struct sermouse *sermouse, signed char data, struct pt_regs *regs)
  65 {
  66         struct input_dev *dev = sermouse->dev;
  67         signed char *buf = sermouse->buf;
  68
  69         input_regs(dev, regs);
  70
  71         switch (sermouse->count) {
  72
  73                 case 0:
  74                         if ((data & 0xf8) != 0x80) return;
  75                         input_report_key(dev, BTN_LEFT,   !(data & 4));
  76                         input_report_key(dev, BTN_RIGHT,  !(data & 1));
  77                         input_report_key(dev, BTN_MIDDLE, !(data & 2));
  78                         break;
  79
  80                 case 1:
  81                 case 3:
  82                         input_report_rel(dev, REL_X, data / 2);
  83                         input_report_rel(dev, REL_Y, -buf[1]);
  84                         buf[0] = data - data / 2;
  85                         break;
  86
  87                 case 2:
  88                 case 4:
  89                         input_report_rel(dev, REL_X, buf[0]);
  90                         input_report_rel(dev, REL_Y, buf[1] - data);
  91                         buf[1] = data / 2;
  92                         break;
  93         }
  94
  95         input_sync(dev);
  96
  97         if (++sermouse->count == 5)
  98                 sermouse->count = 0;
  99 }
 100
 101 /*
 102  * sermouse_process_ms() anlyzes the incoming MS(Z/+/++) bytestream and
 103  * generates events. With prediction it gets 80 updates/sec, assuming
 104  * standard 3-byte packets and 1200 bps.
 105  */
 106
 107 static void sermouse_process_ms(struct sermouse *sermouse, signed char data, struct pt_regs *regs)
 108 {
 109         struct input_dev *dev = sermouse->dev;
 110         signed char *buf = sermouse->buf;
 111
 112         if (data & 0x40) sermouse->count = 0;
 113
 114         input_regs(dev, regs);
 115
 116         switch (sermouse->count) {
 117
 118                 case 0:
 119                         buf[1] = data;
 120                         input_report_key(dev, BTN_LEFT,   (data >> 5) & 1);
 121                         input_report_key(dev, BTN_RIGHT,  (data >> 4) & 1);
 122                         break;
 123
 124                 case 1:
 125                         buf[2] = data;
 126                         data = (signed char) (((buf[1] << 6) & 0xc0) | (data & 0x3f));
 127                         input_report_rel(dev, REL_X, data / 2);
 128                         input_report_rel(dev, REL_Y, buf[4]);
 129                         buf[3] = data - data / 2;
 130                         break;
 131
 132                 case 2:
 133                         /* Guessing the state of the middle button on 3-button MS-protocol mice - ugly. */
 134                         if ((sermouse->type == SERIO_MS) && !data && !buf[2] && !((buf[0] & 0xf0) ^ buf[1]))
 135                                 input_report_key(dev, BTN_MIDDLE, !test_bit(BTN_MIDDLE, dev->key));
 136                         buf[0] = buf[1];
 137
 138                         data = (signed char) (((buf[1] << 4) & 0xc0) | (data & 0x3f));
 139                         input_report_rel(dev, REL_X, buf[3]);
 140                         input_report_rel(dev, REL_Y, data - buf[4]);
 141                         buf[4] = data / 2;
 142                         break;
 143
 144                 case 3:
 145
 146                         switch (sermouse->type) {
 147
 148                                 case SERIO_MS:
 149                                          sermouse->type = SERIO_MP;
 150
 151                                 case SERIO_MP:
 152                                         if ((data >> 2) & 3) break;     /* M++ Wireless Extension packet. */
 153                                         input_report_key(dev, BTN_MIDDLE, (data >> 5) & 1);
 154                                         input_report_key(dev, BTN_SIDE,   (data >> 4) & 1);
 155                                         break;
 156
 157                                 case SERIO_MZP:
 158                                 case SERIO_MZPP:
 159                                         input_report_key(dev, BTN_SIDE,   (data >> 5) & 1);
 160
 161                                 case SERIO_MZ:
 162                                         input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);
 163                                         input_report_rel(dev, REL_WHEEL,  (data & 8) - (data & 7));
 164                                         break;
 165                         }
 166
 167                         break;
 168
 169                 case 4:
 170                 case 6: /* MZ++ packet type. We can get these bytes for M++ too but we ignore them later. */
 171                         buf[1] = (data >> 2) & 0x0f;
 172                         break;
 173
 174                 case 5:
 175                 case 7: /* Ignore anything besides MZ++ */
 176                         if (sermouse->type != SERIO_MZPP) break;
 177
 178                         switch (buf[1]) {
 179
 180                                 case 1: /* Extra mouse info */
 181
 182                                         input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
 183                                         input_report_key(dev, BTN_EXTRA, (data >> 5) & 1);
 184                                         input_report_rel(dev, data & 0x80 ? REL_HWHEEL : REL_WHEEL, (data & 7) - (data & 8));
 185
 186                                         break;
 187
 188                                 default: /* We don't decode anything else yet. */
 189
 190                                         printk(KERN_WARNING
 191                                                 "sermouse.c: Received MZ++ packet %x, don't know how to handle.\n", buf[1]);
 192                                         break;
 193                         }
 194
 195                         break;
 196         }
 197
 198         input_sync(dev);
 199
 200         sermouse->count++;
 201 }
 202
 203 /*
 204  * sermouse_interrupt() handles incoming characters, either gathering them into
 205  * packets or passing them to the command routine as command output.
 206  */
 207
 208 static irqreturn_t sermouse_interrupt(struct serio *serio,
 209                 unsigned char data, unsigned int flags, struct pt_regs *regs)
 210 {
 211         struct sermouse *sermouse = serio_get_drvdata(serio);
 212
 213         if (time_after(jiffies, sermouse->last + HZ/10)) sermouse->count = 0;
 214         sermouse->last = jiffies;
 215
 216         if (sermouse->type > SERIO_SUN)
 217                 sermouse_process_ms(sermouse, data, regs);
 218         else
 219                 sermouse_process_msc(sermouse, data, regs);
 220         return IRQ_HANDLED;
 221 }
 222
 223 /*
 224  * sermouse_disconnect() cleans up after we don't want talk
 225  * to the mouse anymore.
 226  */
 227
 228 static void sermouse_disconnect(struct serio *serio)
 229 {
 230         struct sermouse *sermouse = serio_get_drvdata(serio);
 231
 232         serio_close(serio);
 233         serio_set_drvdata(serio, NULL);
 234         input_unregister_device(sermouse->dev);
 235         kfree(sermouse);
 236 }
 237
 238 /*
 239  * sermouse_connect() is a callback form the serio module when
 240  * an unhandled serio port is found.
 241  */
 242
 243 static int sermouse_connect(struct serio *serio, struct serio_driver *drv)
 244 {
 245         struct sermouse *sermouse;
 246         struct input_dev *input_dev;
 247         unsigned char c = serio->id.extra;
 248         int err = -ENOMEM;
 249
 250         sermouse = kzalloc(sizeof(struct sermouse), GFP_KERNEL);
 251         input_dev = input_allocate_device();
 252         if (!sermouse || !input_dev)
 253                 goto fail;
 254
 255         sermouse->dev = input_dev;
 256         snprintf(sermouse->phys, sizeof(sermouse->phys), "%s/input0", serio->phys);
 257         sermouse->type = serio->id.proto;
 258
 259         input_dev->name = sermouse_protocols[sermouse->type];
 260         input_dev->phys = sermouse->phys;
 261         input_dev->id.bustype = BUS_RS232;
 262         input_dev->id.vendor  = sermouse->type;
 263         input_dev->id.product = c;
 264         input_dev->id.version = 0x0100;
 265         input_dev->cdev.dev = &serio->dev;
 266
 267         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
 268         input_dev->keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT);
 269         input_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
 270         input_dev->private = sermouse;
 271
 272         if (c & 0x01) set_bit(BTN_MIDDLE, input_dev->keybit);
 273         if (c & 0x02) set_bit(BTN_SIDE, input_dev->keybit);
 274         if (c & 0x04) set_bit(BTN_EXTRA, input_dev->keybit);
 275         if (c & 0x10) set_bit(REL_WHEEL, input_dev->relbit);
 276         if (c & 0x20) set_bit(REL_HWHEEL, input_dev->relbit);
 277
 278         serio_set_drvdata(serio, sermouse);
 279
 280         err = serio_open(serio, drv);
 281         if (err)
 282                 goto fail;
 283
 284         input_register_device(sermouse->dev);
 285
 286         return 0;
 287
 288  fail:  serio_set_drvdata(serio, NULL);
 289         input_free_device(input_dev);
 290         kfree(sermouse);
 291         return err;
 292 }
 293
 294 static struct serio_device_id sermouse_serio_ids[] = {
 295         {
 296                 .type   = SERIO_RS232,
 297                 .proto  = SERIO_MSC,
 298                 .id     = SERIO_ANY,
 299                 .extra  = SERIO_ANY,
 300         },
 301         {
 302                 .type   = SERIO_RS232,
 303                 .proto  = SERIO_SUN,
 304                 .id     = SERIO_ANY,
 305                 .extra  = SERIO_ANY,
 306         },
 307         {
 308                 .type   = SERIO_RS232,
 309                 .proto  = SERIO_MS,
 310                 .id     = SERIO_ANY,
 311                 .extra  = SERIO_ANY,
 312         },
 313         {
 314                 .type   = SERIO_RS232,
 315                 .proto  = SERIO_MP,
 316                 .id     = SERIO_ANY,
 317                 .extra  = SERIO_ANY,
 318         },
 319         {
 320                 .type   = SERIO_RS232,
 321                 .proto  = SERIO_MZ,
 322                 .id     = SERIO_ANY,
 323                 .extra  = SERIO_ANY,
 324         },
 325         {
 326                 .type   = SERIO_RS232,
 327                 .proto  = SERIO_MZP,
 328                 .id     = SERIO_ANY,
 329                 .extra  = SERIO_ANY,
 330         },
 331         {
 332                 .type   = SERIO_RS232,
 333                 .proto  = SERIO_MZPP,
 334                 .id     = SERIO_ANY,
 335                 .extra  = SERIO_ANY,
 336         },
 337         { 0 }
 338 };
 339
 340 MODULE_DEVICE_TABLE(serio, sermouse_serio_ids);
 341
 342 static struct serio_driver sermouse_drv = {
 343         .driver         = {
 344                 .name   = "sermouse",
 345         },
 346         .description    = DRIVER_DESC,
 347         .id_table       = sermouse_serio_ids,
 348         .interrupt      = sermouse_interrupt,
 349         .connect        = sermouse_connect,
 350         .disconnect     = sermouse_disconnect,
 351 };
 352
 353 static int __init sermouse_init(void)
 354 {
 355         serio_register_driver(&sermouse_drv);
 356         return 0;
 357 }
 358
 359 static void __exit sermouse_exit(void)
 360 {
 361         serio_unregister_driver(&sermouse_drv);
 362 }
 363
 364 module_init(sermouse_init);
 365 module_exit(sermouse_exit);