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 - ((sermouse->type == SERIO_SUN) << 1)))
  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->private;
 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->private;
 232         input_unregister_device(&sermouse->dev);
 233         serio_close(serio);
 234         kfree(sermouse);
 235 }
 236
 237 /*
 238  * sermouse_connect() is a callback form the serio module when
 239  * an unhandled serio port is found.
 240  */
 241
 242 static void sermouse_connect(struct serio *serio, struct serio_driver *drv)
 243 {
 244         struct sermouse *sermouse;
 245         unsigned char c;
 246
 247         if ((serio->type & SERIO_TYPE) != SERIO_RS232)
 248                 return;
 249
 250         if (!(serio->type & SERIO_PROTO) || ((serio->type & SERIO_PROTO) > SERIO_MZPP))
 251                 return;
 252
 253         if (!(sermouse = kmalloc(sizeof(struct sermouse), GFP_KERNEL)))
 254                 return;
 255
 256         memset(sermouse, 0, sizeof(struct sermouse));
 257
 258         init_input_dev(&sermouse->dev);
 259         sermouse->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
 260         sermouse->dev.keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT);
 261         sermouse->dev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
 262         sermouse->dev.private = sermouse;
 263
 264         serio->private = sermouse;
 265
 266         sermouse->type = serio->type & SERIO_PROTO;
 267         c = (serio->type & SERIO_EXTRA) >> 16;
 268
 269         if (c & 0x01) set_bit(BTN_MIDDLE, sermouse->dev.keybit);
 270         if (c & 0x02) set_bit(BTN_SIDE, sermouse->dev.keybit);
 271         if (c & 0x04) set_bit(BTN_EXTRA, sermouse->dev.keybit);
 272         if (c & 0x10) set_bit(REL_WHEEL, sermouse->dev.relbit);
 273         if (c & 0x20) set_bit(REL_HWHEEL, sermouse->dev.relbit);
 274
 275         sprintf(sermouse->phys, "%s/input0", serio->phys);
 276
 277         sermouse->dev.name = sermouse_protocols[sermouse->type];
 278         sermouse->dev.phys = sermouse->phys;
 279         sermouse->dev.id.bustype = BUS_RS232;
 280         sermouse->dev.id.vendor = sermouse->type;
 281         sermouse->dev.id.product = c;
 282         sermouse->dev.id.version = 0x0100;
 283
 284         if (serio_open(serio, drv)) {
 285                 kfree(sermouse);
 286                 return;
 287         }
 288
 289         input_register_device(&sermouse->dev);
 290
 291         printk(KERN_INFO "input: %s on %s\n", sermouse_protocols[sermouse->type], serio->phys);
 292 }
 293
 294 static struct serio_driver sermouse_drv = {
 295         .driver         = {
 296                 .name   = "sermouse",
 297         },
 298         .description    = DRIVER_DESC,
 299         .interrupt      = sermouse_interrupt,
 300         .connect        = sermouse_connect,
 301         .disconnect     = sermouse_disconnect,
 302 };
 303
 304 int __init sermouse_init(void)
 305 {
 306         serio_register_driver(&sermouse_drv);
 307         return 0;
 308 }
 309
 310 void __exit sermouse_exit(void)
 311 {
 312         serio_unregister_driver(&sermouse_drv);
 313 }
 314
 315 module_init(sermouse_init);
 316 module_exit(sermouse_exit);