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