Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/input/mouse/psmouse-base.c

  1 /*
  2  * PS/2 mouse driver
  3  *
  4  * Copyright (c) 1999-2002 Vojtech Pavlik
  5  * Copyright (c) 2003-2004 Dmitry Torokhov
  6  */
  7 
  8 /*
  9  * This program is free software; you can redistribute it and/or modify it
 10  * under the terms of the GNU General Public License version 2 as published by
 11  * the Free Software Foundation.
 12  */
 13 
 14 #define pr_fmt(fmt)             KBUILD_MODNAME ": " fmt
 15 #define psmouse_fmt(fmt)        fmt
 16 
 17 #include <linux/delay.h>
 18 #include <linux/module.h>
 19 #include <linux/slab.h>
 20 #include <linux/interrupt.h>
 21 #include <linux/input.h>
 22 #include <linux/serio.h>
 23 #include <linux/init.h>
 24 #include <linux/libps2.h>
 25 #include <linux/mutex.h>
 26 
 27 #include "psmouse.h"
 28 #include "synaptics.h"
 29 #include "logips2pp.h"
 30 #include "alps.h"
 31 #include "hgpk.h"
 32 #include "lifebook.h"
 33 #include "trackpoint.h"
 34 #include "touchkit_ps2.h"
 35 #include "elantech.h"
 36 #include "sentelic.h"
 37 #include "cypress_ps2.h"
 38 #include "focaltech.h"
 39 
 40 #define DRIVER_DESC     "PS/2 mouse driver"
 41 
 42 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
 43 MODULE_DESCRIPTION(DRIVER_DESC);
 44 MODULE_LICENSE("GPL");
 45 
 46 static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
 47 static int psmouse_set_maxproto(const char *val, const struct kernel_param *);
 48 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp);
 49 static struct kernel_param_ops param_ops_proto_abbrev = {
 50         .set = psmouse_set_maxproto,
 51         .get = psmouse_get_maxproto,
 52 };
 53 #define param_check_proto_abbrev(name, p)       __param_check(name, p, unsigned int)
 54 module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
 55 MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
 56 
 57 static unsigned int psmouse_resolution = 200;
 58 module_param_named(resolution, psmouse_resolution, uint, 0644);
 59 MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
 60 
 61 static unsigned int psmouse_rate = 100;
 62 module_param_named(rate, psmouse_rate, uint, 0644);
 63 MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
 64 
 65 static bool psmouse_smartscroll = 1;
 66 module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
 67 MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
 68 
 69 static unsigned int psmouse_resetafter = 5;
 70 module_param_named(resetafter, psmouse_resetafter, uint, 0644);
 71 MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
 72 
 73 static unsigned int psmouse_resync_time;
 74 module_param_named(resync_time, psmouse_resync_time, uint, 0644);
 75 MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
 76 
 77 PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
 78                         NULL,
 79                         psmouse_attr_show_protocol, psmouse_attr_set_protocol);
 80 PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
 81                         (void *) offsetof(struct psmouse, rate),
 82                         psmouse_show_int_attr, psmouse_attr_set_rate);
 83 PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
 84                         (void *) offsetof(struct psmouse, resolution),
 85                         psmouse_show_int_attr, psmouse_attr_set_resolution);
 86 PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
 87                         (void *) offsetof(struct psmouse, resetafter),
 88                         psmouse_show_int_attr, psmouse_set_int_attr);
 89 PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
 90                         (void *) offsetof(struct psmouse, resync_time),
 91                         psmouse_show_int_attr, psmouse_set_int_attr);
 92 
 93 static struct attribute *psmouse_attributes[] = {
 94         &psmouse_attr_protocol.dattr.attr,
 95         &psmouse_attr_rate.dattr.attr,
 96         &psmouse_attr_resolution.dattr.attr,
 97         &psmouse_attr_resetafter.dattr.attr,
 98         &psmouse_attr_resync_time.dattr.attr,
 99         NULL
100 };
101 
102 static struct attribute_group psmouse_attribute_group = {
103         .attrs  = psmouse_attributes,
104 };
105 
106 /*
107  * psmouse_mutex protects all operations changing state of mouse
108  * (connecting, disconnecting, changing rate or resolution via
109  * sysfs). We could use a per-device semaphore but since there
110  * rarely more than one PS/2 mouse connected and since semaphore
111  * is taken in "slow" paths it is not worth it.
112  */
113 static DEFINE_MUTEX(psmouse_mutex);
114 
115 static struct workqueue_struct *kpsmoused_wq;
116 
117 struct psmouse_protocol {
118         enum psmouse_type type;
119         bool maxproto;
120         bool ignore_parity; /* Protocol should ignore parity errors from KBC */
121         const char *name;
122         const char *alias;
123         int (*detect)(struct psmouse *, bool);
124         int (*init)(struct psmouse *);
125 };
126 
127 /*
128  * psmouse_process_byte() analyzes the PS/2 data stream and reports
129  * relevant events to the input module once full packet has arrived.
130  */
131 
132 psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
133 {
134         struct input_dev *dev = psmouse->dev;
135         unsigned char *packet = psmouse->packet;
136 
137         if (psmouse->pktcnt < psmouse->pktsize)
138                 return PSMOUSE_GOOD_DATA;
139 
140 /*
141  * Full packet accumulated, process it
142  */
143 
144 /*
145  * Scroll wheel on IntelliMice, scroll buttons on NetMice
146  */
147 
148         if (psmouse->type == PSMOUSE_IMPS || psmouse->type == PSMOUSE_GENPS)
149                 input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);
150 
151 /*
152  * Scroll wheel and buttons on IntelliMouse Explorer
153  */
154 
155         if (psmouse->type == PSMOUSE_IMEX) {
156                 switch (packet[3] & 0xC0) {
157                 case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
158                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
159                         break;
160                 case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
161                         input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
162                         break;
163                 case 0x00:
164                 case 0xC0:
165                         input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
166                         input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
167                         input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
168                         break;
169                 }
170         }
171 
172 /*
173  * Extra buttons on Genius NewNet 3D
174  */
175 
176         if (psmouse->type == PSMOUSE_GENPS) {
177                 input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
178                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
179         }
180 
181 /*
182  * Extra button on ThinkingMouse
183  */
184         if (psmouse->type == PSMOUSE_THINKPS) {
185                 input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
186                 /* Without this bit of weirdness moving up gives wildly high Y changes. */
187                 packet[1] |= (packet[0] & 0x40) << 1;
188         }
189 
190 /*
191  * Cortron PS2 Trackball reports SIDE button on the 4th bit of the first
192  * byte.
193  */
194         if (psmouse->type == PSMOUSE_CORTRON) {
195                 input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
196                 packet[0] |= 0x08;
197         }
198 
199 /*
200  * Generic PS/2 Mouse
201  */
202 
203         input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
204         input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
205         input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);
206 
207         input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
208         input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
209 
210         input_sync(dev);
211 
212         return PSMOUSE_FULL_PACKET;
213 }
214 
215 void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
216                 unsigned long delay)
217 {
218         queue_delayed_work(kpsmoused_wq, work, delay);
219 }
220 
221 /*
222  * __psmouse_set_state() sets new psmouse state and resets all flags.
223  */
224 
225 static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
226 {
227         psmouse->state = new_state;
228         psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
229         psmouse->ps2dev.flags = 0;
230         psmouse->last = jiffies;
231 }
232 
233 
234 /*
235  * psmouse_set_state() sets new psmouse state and resets all flags and
236  * counters while holding serio lock so fighting with interrupt handler
237  * is not a concern.
238  */
239 
240 void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
241 {
242         serio_pause_rx(psmouse->ps2dev.serio);
243         __psmouse_set_state(psmouse, new_state);
244         serio_continue_rx(psmouse->ps2dev.serio);
245 }
246 
247 /*
248  * psmouse_handle_byte() processes one byte of the input data stream
249  * by calling corresponding protocol handler.
250  */
251 
252 static int psmouse_handle_byte(struct psmouse *psmouse)
253 {
254         psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
255 
256         switch (rc) {
257         case PSMOUSE_BAD_DATA:
258                 if (psmouse->state == PSMOUSE_ACTIVATED) {
259                         psmouse_warn(psmouse,
260                                      "%s at %s lost sync at byte %d\n",
261                                      psmouse->name, psmouse->phys,
262                                      psmouse->pktcnt);
263                         if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
264                                 __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
265                                 psmouse_notice(psmouse,
266                                                 "issuing reconnect request\n");
267                                 serio_reconnect(psmouse->ps2dev.serio);
268                                 return -1;
269                         }
270                 }
271                 psmouse->pktcnt = 0;
272                 break;
273 
274         case PSMOUSE_FULL_PACKET:
275                 psmouse->pktcnt = 0;
276                 if (psmouse->out_of_sync_cnt) {
277                         psmouse->out_of_sync_cnt = 0;
278                         psmouse_notice(psmouse,
279                                         "%s at %s - driver resynced.\n",
280                                         psmouse->name, psmouse->phys);
281                 }
282                 break;
283 
284         case PSMOUSE_GOOD_DATA:
285                 break;
286         }
287         return 0;
288 }
289 
290 /*
291  * psmouse_interrupt() handles incoming characters, either passing them
292  * for normal processing or gathering them as command response.
293  */
294 
295 static irqreturn_t psmouse_interrupt(struct serio *serio,
296                 unsigned char data, unsigned int flags)
297 {
298         struct psmouse *psmouse = serio_get_drvdata(serio);
299 
300         if (psmouse->state == PSMOUSE_IGNORE)
301                 goto out;
302 
303         if (unlikely((flags & SERIO_TIMEOUT) ||
304                      ((flags & SERIO_PARITY) && !psmouse->ignore_parity))) {
305 
306                 if (psmouse->state == PSMOUSE_ACTIVATED)
307                         psmouse_warn(psmouse,
308                                      "bad data from KBC -%s%s\n",
309                                      flags & SERIO_TIMEOUT ? " timeout" : "",
310                                      flags & SERIO_PARITY ? " bad parity" : "");
311                 ps2_cmd_aborted(&psmouse->ps2dev);
312                 goto out;
313         }
314 
315         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
316                 if  (ps2_handle_ack(&psmouse->ps2dev, data))
317                         goto out;
318 
319         if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
320                 if  (ps2_handle_response(&psmouse->ps2dev, data))
321                         goto out;
322 
323         if (psmouse->state <= PSMOUSE_RESYNCING)
324                 goto out;
325 
326         if (psmouse->state == PSMOUSE_ACTIVATED &&
327             psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
328                 psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
329                              psmouse->name, psmouse->phys, psmouse->pktcnt);
330                 psmouse->badbyte = psmouse->packet[0];
331                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
332                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
333                 goto out;
334         }
335 
336         psmouse->packet[psmouse->pktcnt++] = data;
337 /*
338  * Check if this is a new device announcement (0xAA 0x00)
339  */
340         if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
341                 if (psmouse->pktcnt == 1) {
342                         psmouse->last = jiffies;
343                         goto out;
344                 }
345 
346                 if (psmouse->packet[1] == PSMOUSE_RET_ID ||
347                     (psmouse->type == PSMOUSE_HGPK &&
348                      psmouse->packet[1] == PSMOUSE_RET_BAT)) {
349                         __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
350                         serio_reconnect(serio);
351                         goto out;
352                 }
353 /*
354  * Not a new device, try processing first byte normally
355  */
356                 psmouse->pktcnt = 1;
357                 if (psmouse_handle_byte(psmouse))
358                         goto out;
359 
360                 psmouse->packet[psmouse->pktcnt++] = data;
361         }
362 
363 /*
364  * See if we need to force resync because mouse was idle for too long
365  */
366         if (psmouse->state == PSMOUSE_ACTIVATED &&
367             psmouse->pktcnt == 1 && psmouse->resync_time &&
368             time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
369                 psmouse->badbyte = psmouse->packet[0];
370                 __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
371                 psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
372                 goto out;
373         }
374 
375         psmouse->last = jiffies;
376         psmouse_handle_byte(psmouse);
377 
378  out:
379         return IRQ_HANDLED;
380 }
381 
382 
383 /*
384  * psmouse_sliced_command() sends an extended PS/2 command to the mouse
385  * using sliced syntax, understood by advanced devices, such as Logitech
386  * or Synaptics touchpads. The command is encoded as:
387  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
388  * is the command.
389  */
390 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
391 {
392         int i;
393 
394         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
395                 return -1;
396 
397         for (i = 6; i >= 0; i -= 2) {
398                 unsigned char d = (command >> i) & 3;
399                 if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
400                         return -1;
401         }
402 
403         return 0;
404 }
405 
406 
407 /*
408  * psmouse_reset() resets the mouse into power-on state.
409  */
410 int psmouse_reset(struct psmouse *psmouse)
411 {
412         unsigned char param[2];
413 
414         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
415                 return -1;
416 
417         if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
418                 return -1;
419 
420         return 0;
421 }
422 
423 /*
424  * Here we set the mouse resolution.
425  */
426 
427 void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
428 {
429         static const unsigned char params[] = { 0, 1, 2, 2, 3 };
430         unsigned char p;
431 
432         if (resolution == 0 || resolution > 200)
433                 resolution = 200;
434 
435         p = params[resolution / 50];
436         ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
437         psmouse->resolution = 25 << p;
438 }
439 
440 /*
441  * Here we set the mouse report rate.
442  */
443 
444 static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
445 {
446         static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
447         unsigned char r;
448         int i = 0;
449 
450         while (rates[i] > rate) i++;
451         r = rates[i];
452         ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
453         psmouse->rate = r;
454 }
455 
456 /*
457  * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
458  */
459 
460 static int psmouse_poll(struct psmouse *psmouse)
461 {
462         return ps2_command(&psmouse->ps2dev, psmouse->packet,
463                            PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
464 }
465 
466 /*
467  * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
468  */
469 bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
470 {
471         int i;
472 
473         if (!strncmp(psmouse->ps2dev.serio->firmware_id, "PNP:", 4))
474                 for (i = 0; ids[i]; i++)
475                         if (strstr(psmouse->ps2dev.serio->firmware_id, ids[i]))
476                                 return true;
477 
478         return false;
479 }
480 
481 /*
482  * Genius NetMouse magic init.
483  */
484 static int genius_detect(struct psmouse *psmouse, bool set_properties)
485 {
486         struct ps2dev *ps2dev = &psmouse->ps2dev;
487         unsigned char param[4];
488 
489         param[0] = 3;
490         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
491         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
492         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
493         ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
494         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
495 
496         if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
497                 return -1;
498 
499         if (set_properties) {
500                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
501                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
502                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
503                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
504 
505                 psmouse->vendor = "Genius";
506                 psmouse->name = "Mouse";
507                 psmouse->pktsize = 4;
508         }
509 
510         return 0;
511 }
512 
513 /*
514  * IntelliMouse magic init.
515  */
516 static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
517 {
518         struct ps2dev *ps2dev = &psmouse->ps2dev;
519         unsigned char param[2];
520 
521         param[0] = 200;
522         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
523         param[0] = 100;
524         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
525         param[0] =  80;
526         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
527         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
528 
529         if (param[0] != 3)
530                 return -1;
531 
532         if (set_properties) {
533                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
534                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
535 
536                 if (!psmouse->vendor)
537                         psmouse->vendor = "Generic";
538                 if (!psmouse->name)
539                         psmouse->name = "Wheel Mouse";
540                 psmouse->pktsize = 4;
541         }
542 
543         return 0;
544 }
545 
546 /*
547  * Try IntelliMouse/Explorer magic init.
548  */
549 static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
550 {
551         struct ps2dev *ps2dev = &psmouse->ps2dev;
552         unsigned char param[2];
553 
554         intellimouse_detect(psmouse, 0);
555 
556         param[0] = 200;
557         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
558         param[0] = 200;
559         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
560         param[0] =  80;
561         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
562         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
563 
564         if (param[0] != 4)
565                 return -1;
566 
567 /* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
568         param[0] = 200;
569         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
570         param[0] =  80;
571         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
572         param[0] =  40;
573         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
574 
575         if (set_properties) {
576                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
577                 __set_bit(REL_WHEEL, psmouse->dev->relbit);
578                 __set_bit(REL_HWHEEL, psmouse->dev->relbit);
579                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
580                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
581 
582                 if (!psmouse->vendor)
583                         psmouse->vendor = "Generic";
584                 if (!psmouse->name)
585                         psmouse->name = "Explorer Mouse";
586                 psmouse->pktsize = 4;
587         }
588 
589         return 0;
590 }
591 
592 /*
593  * Kensington ThinkingMouse / ExpertMouse magic init.
594  */
595 static int thinking_detect(struct psmouse *psmouse, bool set_properties)
596 {
597         struct ps2dev *ps2dev = &psmouse->ps2dev;
598         unsigned char param[2];
599         static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
600         int i;
601 
602         param[0] = 10;
603         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
604         param[0] = 0;
605         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
606         for (i = 0; i < ARRAY_SIZE(seq); i++) {
607                 param[0] = seq[i];
608                 ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
609         }
610         ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
611 
612         if (param[0] != 2)
613                 return -1;
614 
615         if (set_properties) {
616                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
617                 __set_bit(BTN_EXTRA, psmouse->dev->keybit);
618 
619                 psmouse->vendor = "Kensington";
620                 psmouse->name = "ThinkingMouse";
621         }
622 
623         return 0;
624 }
625 
626 /*
627  * Bare PS/2 protocol "detection". Always succeeds.
628  */
629 static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
630 {
631         if (set_properties) {
632                 if (!psmouse->vendor)
633                         psmouse->vendor = "Generic";
634                 if (!psmouse->name)
635                         psmouse->name = "Mouse";
636 
637 /*
638  * We have no way of figuring true number of buttons so let's
639  * assume that the device has 3.
640  */
641                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
642         }
643 
644         return 0;
645 }
646 
647 /*
648  * Cortron PS/2 protocol detection. There's no special way to detect it, so it
649  * must be forced by sysfs protocol writing.
650  */
651 static int cortron_detect(struct psmouse *psmouse, bool set_properties)
652 {
653         if (set_properties) {
654                 psmouse->vendor = "Cortron";
655                 psmouse->name = "PS/2 Trackball";
656 
657                 __set_bit(BTN_MIDDLE, psmouse->dev->keybit);
658                 __set_bit(BTN_SIDE, psmouse->dev->keybit);
659         }
660 
661         return 0;
662 }
663 
664 /*
665  * Apply default settings to the psmouse structure. Most of them will
666  * be overridden by individual protocol initialization routines.
667  */
668 
669 static void psmouse_apply_defaults(struct psmouse *psmouse)
670 {
671         struct input_dev *input_dev = psmouse->dev;
672 
673         memset(input_dev->evbit, 0, sizeof(input_dev->evbit));
674         memset(input_dev->keybit, 0, sizeof(input_dev->keybit));
675         memset(input_dev->relbit, 0, sizeof(input_dev->relbit));
676         memset(input_dev->absbit, 0, sizeof(input_dev->absbit));
677         memset(input_dev->mscbit, 0, sizeof(input_dev->mscbit));
678 
679         __set_bit(EV_KEY, input_dev->evbit);
680         __set_bit(EV_REL, input_dev->evbit);
681 
682         __set_bit(BTN_LEFT, input_dev->keybit);
683         __set_bit(BTN_RIGHT, input_dev->keybit);
684 
685         __set_bit(REL_X, input_dev->relbit);
686         __set_bit(REL_Y, input_dev->relbit);
687 
688         __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
689 
690         psmouse->set_rate = psmouse_set_rate;
691         psmouse->set_resolution = psmouse_set_resolution;
692         psmouse->poll = psmouse_poll;
693         psmouse->protocol_handler = psmouse_process_byte;
694         psmouse->pktsize = 3;
695         psmouse->reconnect = NULL;
696         psmouse->disconnect = NULL;
697         psmouse->cleanup = NULL;
698         psmouse->pt_activate = NULL;
699         psmouse->pt_deactivate = NULL;
700 }
701 
702 /*
703  * Apply default settings to the psmouse structure and call specified
704  * protocol detection or initialization routine.
705  */
706 static int psmouse_do_detect(int (*detect)(struct psmouse *psmouse,
707                                            bool set_properties),
708                              struct psmouse *psmouse, bool set_properties)
709 {
710         if (set_properties)
711                 psmouse_apply_defaults(psmouse);
712 
713         return detect(psmouse, set_properties);
714 }
715 
716 /*
717  * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
718  * the mouse may have.
719  */
720 
721 static int psmouse_extensions(struct psmouse *psmouse,
722                               unsigned int max_proto, bool set_properties)
723 {
724         bool synaptics_hardware = false;
725 
726 /* Always check for focaltech, this is safe as it uses pnp-id matching */
727         if (psmouse_do_detect(focaltech_detect, psmouse, set_properties) == 0) {
728                 if (!set_properties || focaltech_init(psmouse) == 0) {
729                         /*
730                          * Not supported yet, use bare protocol.
731                          * Note that we need to also restrict
732                          * psmouse_max_proto so that psmouse_initialize()
733                          * does not try to reset rate and resolution,
734                          * because even that upsets the device.
735                          */
736                         psmouse_max_proto = PSMOUSE_PS2;
737                         return PSMOUSE_PS2;
738                 }
739         }
740 
741 /*
742  * We always check for lifebook because it does not disturb mouse
743  * (it only checks DMI information).
744  */
745         if (psmouse_do_detect(lifebook_detect, psmouse, set_properties) == 0) {
746                 if (max_proto > PSMOUSE_IMEX) {
747                         if (!set_properties || lifebook_init(psmouse) == 0)
748                                 return PSMOUSE_LIFEBOOK;
749                 }
750         }
751 
752 /*
753  * Try Kensington ThinkingMouse (we try first, because synaptics probe
754  * upsets the thinkingmouse).
755  */
756 
757         if (max_proto > PSMOUSE_IMEX &&
758             psmouse_do_detect(thinking_detect, psmouse, set_properties) == 0) {
759                 return PSMOUSE_THINKPS;
760         }
761 
762 /*
763  * Try Synaptics TouchPad. Note that probing is done even if Synaptics protocol
764  * support is disabled in config - we need to know if it is synaptics so we
765  * can reset it properly after probing for intellimouse.
766  */
767         if (max_proto > PSMOUSE_PS2 &&
768             psmouse_do_detect(synaptics_detect, psmouse, set_properties) == 0) {
769                 synaptics_hardware = true;
770 
771                 if (max_proto > PSMOUSE_IMEX) {
772 /*
773  * Try activating protocol, but check if support is enabled first, since
774  * we try detecting Synaptics even when protocol is disabled.
775  */
776                         if (synaptics_supported() &&
777                             (!set_properties || synaptics_init(psmouse) == 0)) {
778                                 return PSMOUSE_SYNAPTICS;
779                         }
780 
781 /*
782  * Some Synaptics touchpads can emulate extended protocols (like IMPS/2).
783  * Unfortunately Logitech/Genius probes confuse some firmware versions so
784  * we'll have to skip them.
785  */
786                         max_proto = PSMOUSE_IMEX;
787                 }
788 /*
789  * Make sure that touchpad is in relative mode, gestures (taps) are enabled
790  */
791                 synaptics_reset(psmouse);
792         }
793 
794 /*
795  * Try Cypress Trackpad.
796  * Must try it before Finger Sensing Pad because Finger Sensing Pad probe
797  * upsets some modules of Cypress Trackpads.
798  */
799         if (max_proto > PSMOUSE_IMEX &&
800                         cypress_detect(psmouse, set_properties) == 0) {
801                 if (cypress_supported()) {
802                         if (cypress_init(psmouse) == 0)
803                                 return PSMOUSE_CYPRESS;
804 
805                         /*
806                          * Finger Sensing Pad probe upsets some modules of
807                          * Cypress Trackpad, must avoid Finger Sensing Pad
808                          * probe if Cypress Trackpad device detected.
809                          */
810                         return PSMOUSE_PS2;
811                 }
812 
813                 max_proto = PSMOUSE_IMEX;
814         }
815 
816 /*
817  * Try ALPS TouchPad
818  */
819         if (max_proto > PSMOUSE_IMEX) {
820                 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
821                 if (psmouse_do_detect(alps_detect,
822                                       psmouse, set_properties) == 0) {
823                         if (!set_properties || alps_init(psmouse) == 0)
824                                 return PSMOUSE_ALPS;
825 /*
826  * Init failed, try basic relative protocols
827  */
828                         max_proto = PSMOUSE_IMEX;
829                 }
830         }
831 
832 /*
833  * Try OLPC HGPK touchpad.
834  */
835         if (max_proto > PSMOUSE_IMEX &&
836             psmouse_do_detect(hgpk_detect, psmouse, set_properties) == 0) {
837                 if (!set_properties || hgpk_init(psmouse) == 0)
838                         return PSMOUSE_HGPK;
839 /*
840  * Init failed, try basic relative protocols
841  */
842                 max_proto = PSMOUSE_IMEX;
843         }
844 
845 /*
846  * Try Elantech touchpad.
847  */
848         if (max_proto > PSMOUSE_IMEX &&
849             psmouse_do_detect(elantech_detect, psmouse, set_properties) == 0) {
850                 if (!set_properties || elantech_init(psmouse) == 0)
851                         return PSMOUSE_ELANTECH;
852 /*
853  * Init failed, try basic relative protocols
854  */
855                 max_proto = PSMOUSE_IMEX;
856         }
857 
858         if (max_proto > PSMOUSE_IMEX) {
859                 if (psmouse_do_detect(genius_detect,
860                                       psmouse, set_properties) == 0)
861                         return PSMOUSE_GENPS;
862 
863                 if (psmouse_do_detect(ps2pp_init,
864                                       psmouse, set_properties) == 0)
865                         return PSMOUSE_PS2PP;
866 
867                 if (psmouse_do_detect(trackpoint_detect,
868                                       psmouse, set_properties) == 0)
869                         return PSMOUSE_TRACKPOINT;
870 
871                 if (psmouse_do_detect(touchkit_ps2_detect,
872                                       psmouse, set_properties) == 0)
873                         return PSMOUSE_TOUCHKIT_PS2;
874         }
875 
876 /*
877  * Try Finger Sensing Pad. We do it here because its probe upsets
878  * Trackpoint devices (causing TP_READ_ID command to time out).
879  */
880         if (max_proto > PSMOUSE_IMEX) {
881                 if (psmouse_do_detect(fsp_detect,
882                                       psmouse, set_properties) == 0) {
883                         if (!set_properties || fsp_init(psmouse) == 0)
884                                 return PSMOUSE_FSP;
885 /*
886  * Init failed, try basic relative protocols
887  */
888                         max_proto = PSMOUSE_IMEX;
889                 }
890         }
891 
892 /*
893  * Reset to defaults in case the device got confused by extended
894  * protocol probes. Note that we follow up with full reset because
895  * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
896  */
897         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
898         psmouse_reset(psmouse);
899 
900         if (max_proto >= PSMOUSE_IMEX &&
901             psmouse_do_detect(im_explorer_detect,
902                               psmouse, set_properties) == 0) {
903                 return PSMOUSE_IMEX;
904         }
905 
906         if (max_proto >= PSMOUSE_IMPS &&
907             psmouse_do_detect(intellimouse_detect,
908                               psmouse, set_properties) == 0) {
909                 return PSMOUSE_IMPS;
910         }
911 
912 /*
913  * Okay, all failed, we have a standard mouse here. The number of the buttons
914  * is still a question, though. We assume 3.
915  */
916         psmouse_do_detect(ps2bare_detect, psmouse, set_properties);
917 
918         if (synaptics_hardware) {
919 /*
920  * We detected Synaptics hardware but it did not respond to IMPS/2 probes.
921  * We need to reset the touchpad because if there is a track point on the
922  * pass through port it could get disabled while probing for protocol
923  * extensions.
924  */
925                 psmouse_reset(psmouse);
926         }
927 
928         return PSMOUSE_PS2;
929 }
930 
931 static const struct psmouse_protocol psmouse_protocols[] = {
932         {
933                 .type           = PSMOUSE_PS2,
934                 .name           = "PS/2",
935                 .alias          = "bare",
936                 .maxproto       = true,
937                 .ignore_parity  = true,
938                 .detect         = ps2bare_detect,
939         },
940 #ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
941         {
942                 .type           = PSMOUSE_PS2PP,
943                 .name           = "PS2++",
944                 .alias          = "logitech",
945                 .detect         = ps2pp_init,
946         },
947 #endif
948         {
949                 .type           = PSMOUSE_THINKPS,
950                 .name           = "ThinkPS/2",
951                 .alias          = "thinkps",
952                 .detect         = thinking_detect,
953         },
954 #ifdef CONFIG_MOUSE_PS2_CYPRESS
955         {
956                 .type           = PSMOUSE_CYPRESS,
957                 .name           = "CyPS/2",
958                 .alias          = "cypress",
959                 .detect         = cypress_detect,
960                 .init           = cypress_init,
961         },
962 #endif
963         {
964                 .type           = PSMOUSE_GENPS,
965                 .name           = "GenPS/2",
966                 .alias          = "genius",
967                 .detect         = genius_detect,
968         },
969         {
970                 .type           = PSMOUSE_IMPS,
971                 .name           = "ImPS/2",
972                 .alias          = "imps",
973                 .maxproto       = true,
974                 .ignore_parity  = true,
975                 .detect         = intellimouse_detect,
976         },
977         {
978                 .type           = PSMOUSE_IMEX,
979                 .name           = "ImExPS/2",
980                 .alias          = "exps",
981                 .maxproto       = true,
982                 .ignore_parity  = true,
983                 .detect         = im_explorer_detect,
984         },
985 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
986         {
987                 .type           = PSMOUSE_SYNAPTICS,
988                 .name           = "SynPS/2",
989                 .alias          = "synaptics",
990                 .detect         = synaptics_detect,
991                 .init           = synaptics_init,
992         },
993         {
994                 .type           = PSMOUSE_SYNAPTICS_RELATIVE,
995                 .name           = "SynRelPS/2",
996                 .alias          = "synaptics-relative",
997                 .detect         = synaptics_detect,
998                 .init           = synaptics_init_relative,
999         },
1000 #endif
1001 #ifdef CONFIG_MOUSE_PS2_ALPS
1002         {
1003                 .type           = PSMOUSE_ALPS,
1004                 .name           = "AlpsPS/2",
1005                 .alias          = "alps",
1006                 .detect         = alps_detect,
1007                 .init           = alps_init,
1008         },
1009 #endif
1010 #ifdef CONFIG_MOUSE_PS2_LIFEBOOK
1011         {
1012                 .type           = PSMOUSE_LIFEBOOK,
1013                 .name           = "LBPS/2",
1014                 .alias          = "lifebook",
1015                 .init           = lifebook_init,
1016         },
1017 #endif
1018 #ifdef CONFIG_MOUSE_PS2_TRACKPOINT
1019         {
1020                 .type           = PSMOUSE_TRACKPOINT,
1021                 .name           = "TPPS/2",
1022                 .alias          = "trackpoint",
1023                 .detect         = trackpoint_detect,
1024         },
1025 #endif
1026 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
1027         {
1028                 .type           = PSMOUSE_TOUCHKIT_PS2,
1029                 .name           = "touchkitPS/2",
1030                 .alias          = "touchkit",
1031                 .detect         = touchkit_ps2_detect,
1032         },
1033 #endif
1034 #ifdef CONFIG_MOUSE_PS2_OLPC
1035         {
1036                 .type           = PSMOUSE_HGPK,
1037                 .name           = "OLPC HGPK",
1038                 .alias          = "hgpk",
1039                 .detect         = hgpk_detect,
1040         },
1041 #endif
1042 #ifdef CONFIG_MOUSE_PS2_ELANTECH
1043         {
1044                 .type           = PSMOUSE_ELANTECH,
1045                 .name           = "ETPS/2",
1046                 .alias          = "elantech",
1047                 .detect         = elantech_detect,
1048                 .init           = elantech_init,
1049         },
1050 #endif
1051 #ifdef CONFIG_MOUSE_PS2_SENTELIC
1052         {
1053                 .type           = PSMOUSE_FSP,
1054                 .name           = "FSPPS/2",
1055                 .alias          = "fsp",
1056                 .detect         = fsp_detect,
1057                 .init           = fsp_init,
1058         },
1059 #endif
1060         {
1061                 .type           = PSMOUSE_CORTRON,
1062                 .name           = "CortronPS/2",
1063                 .alias          = "cortps",
1064                 .detect         = cortron_detect,
1065         },
1066         {
1067                 .type           = PSMOUSE_AUTO,
1068                 .name           = "auto",
1069                 .alias          = "any",
1070                 .maxproto       = true,
1071         },
1072 };
1073 
1074 static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
1075 {
1076         int i;
1077 
1078         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
1079                 if (psmouse_protocols[i].type == type)
1080                         return &psmouse_protocols[i];
1081 
1082         WARN_ON(1);
1083         return &psmouse_protocols[0];
1084 }
1085 
1086 static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
1087 {
1088         const struct psmouse_protocol *p;
1089         int i;
1090 
1091         for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
1092                 p = &psmouse_protocols[i];
1093 
1094                 if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
1095                     (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
1096                         return &psmouse_protocols[i];
1097         }
1098 
1099         return NULL;
1100 }
1101 
1102 
1103 /*
1104  * psmouse_probe() probes for a PS/2 mouse.
1105  */
1106 
1107 static int psmouse_probe(struct psmouse *psmouse)
1108 {
1109         struct ps2dev *ps2dev = &psmouse->ps2dev;
1110         unsigned char param[2];
1111 
1112 /*
1113  * First, we check if it's a mouse. It should send 0x00 or 0x03
1114  * in case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
1115  * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and subsequent
1116  * ID queries, probably due to a firmware bug.
1117  */
1118 
1119         param[0] = 0xa5;
1120         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
1121                 return -1;
1122 
1123         if (param[0] != 0x00 && param[0] != 0x03 &&
1124             param[0] != 0x04 && param[0] != 0xff)
1125                 return -1;
1126 
1127 /*
1128  * Then we reset and disable the mouse so that it doesn't generate events.
1129  */
1130 
1131         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
1132                 psmouse_warn(psmouse, "Failed to reset mouse on %s\n",
1133                              ps2dev->serio->phys);
1134 
1135         return 0;
1136 }
1137 
1138 /*
1139  * psmouse_initialize() initializes the mouse to a sane state.
1140  */
1141 
1142 static void psmouse_initialize(struct psmouse *psmouse)
1143 {
1144 /*
1145  * We set the mouse report rate, resolution and scaling.
1146  */
1147 
1148         if (psmouse_max_proto != PSMOUSE_PS2) {
1149                 psmouse->set_rate(psmouse, psmouse->rate);
1150                 psmouse->set_resolution(psmouse, psmouse->resolution);
1151                 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
1152         }
1153 }
1154 
1155 /*
1156  * psmouse_activate() enables the mouse so that we get motion reports from it.
1157  */
1158 
1159 int psmouse_activate(struct psmouse *psmouse)
1160 {
1161         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1162                 psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
1163                              psmouse->ps2dev.serio->phys);
1164                 return -1;
1165         }
1166 
1167         psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1168         return 0;
1169 }
1170 
1171 /*
1172  * psmouse_deactivate() puts the mouse into poll mode so that we don't get motion
1173  * reports from it unless we explicitly request it.
1174  */
1175 
1176 int psmouse_deactivate(struct psmouse *psmouse)
1177 {
1178         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE)) {
1179                 psmouse_warn(psmouse, "Failed to deactivate mouse on %s\n",
1180                              psmouse->ps2dev.serio->phys);
1181                 return -1;
1182         }
1183 
1184         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1185         return 0;
1186 }
1187 
1188 
1189 /*
1190  * psmouse_resync() attempts to re-validate current protocol.
1191  */
1192 
1193 static void psmouse_resync(struct work_struct *work)
1194 {
1195         struct psmouse *parent = NULL, *psmouse =
1196                 container_of(work, struct psmouse, resync_work.work);
1197         struct serio *serio = psmouse->ps2dev.serio;
1198         psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
1199         bool failed = false, enabled = false;
1200         int i;
1201 
1202         mutex_lock(&psmouse_mutex);
1203 
1204         if (psmouse->state != PSMOUSE_RESYNCING)
1205                 goto out;
1206 
1207         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1208                 parent = serio_get_drvdata(serio->parent);
1209                 psmouse_deactivate(parent);
1210         }
1211 
1212 /*
1213  * Some mice don't ACK commands sent while they are in the middle of
1214  * transmitting motion packet. To avoid delay we use ps2_sendbyte()
1215  * instead of ps2_command() which would wait for 200ms for an ACK
1216  * that may never come.
1217  * As an additional quirk ALPS touchpads may not only forget to ACK
1218  * disable command but will stop reporting taps, so if we see that
1219  * mouse at least once ACKs disable we will do full reconnect if ACK
1220  * is missing.
1221  */
1222         psmouse->num_resyncs++;
1223 
1224         if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
1225                 if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
1226                         failed = true;
1227         } else
1228                 psmouse->acks_disable_command = true;
1229 
1230 /*
1231  * Poll the mouse. If it was reset the packet will be shorter than
1232  * psmouse->pktsize and ps2_command will fail. We do not expect and
1233  * do not handle scenario when mouse "upgrades" its protocol while
1234  * disconnected since it would require additional delay. If we ever
1235  * see a mouse that does it we'll adjust the code.
1236  */
1237         if (!failed) {
1238                 if (psmouse->poll(psmouse))
1239                         failed = true;
1240                 else {
1241                         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1242                         for (i = 0; i < psmouse->pktsize; i++) {
1243                                 psmouse->pktcnt++;
1244                                 rc = psmouse->protocol_handler(psmouse);
1245                                 if (rc != PSMOUSE_GOOD_DATA)
1246                                         break;
1247                         }
1248                         if (rc != PSMOUSE_FULL_PACKET)
1249                                 failed = true;
1250                         psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
1251                 }
1252         }
1253 /*
1254  * Now try to enable mouse. We try to do that even if poll failed and also
1255  * repeat our attempts 5 times, otherwise we may be left out with disabled
1256  * mouse.
1257  */
1258         for (i = 0; i < 5; i++) {
1259                 if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
1260                         enabled = true;
1261                         break;
1262                 }
1263                 msleep(200);
1264         }
1265 
1266         if (!enabled) {
1267                 psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
1268                              psmouse->ps2dev.serio->phys);
1269                 failed = true;
1270         }
1271 
1272         if (failed) {
1273                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1274                 psmouse_info(psmouse,
1275                              "resync failed, issuing reconnect request\n");
1276                 serio_reconnect(serio);
1277         } else
1278                 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
1279 
1280         if (parent)
1281                 psmouse_activate(parent);
1282  out:
1283         mutex_unlock(&psmouse_mutex);
1284 }
1285 
1286 /*
1287  * psmouse_cleanup() resets the mouse into power-on state.
1288  */
1289 
1290 static void psmouse_cleanup(struct serio *serio)
1291 {
1292         struct psmouse *psmouse = serio_get_drvdata(serio);
1293         struct psmouse *parent = NULL;
1294 
1295         mutex_lock(&psmouse_mutex);
1296 
1297         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1298                 parent = serio_get_drvdata(serio->parent);
1299                 psmouse_deactivate(parent);
1300         }
1301 
1302         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1303 
1304         /*
1305          * Disable stream mode so cleanup routine can proceed undisturbed.
1306          */
1307         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1308                 psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
1309                              psmouse->ps2dev.serio->phys);
1310 
1311         if (psmouse->cleanup)
1312                 psmouse->cleanup(psmouse);
1313 
1314 /*
1315  * Reset the mouse to defaults (bare PS/2 protocol).
1316  */
1317         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1318 
1319 /*
1320  * Some boxes, such as HP nx7400, get terribly confused if mouse
1321  * is not fully enabled before suspending/shutting down.
1322  */
1323         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
1324 
1325         if (parent) {
1326                 if (parent->pt_deactivate)
1327                         parent->pt_deactivate(parent);
1328 
1329                 psmouse_activate(parent);
1330         }
1331 
1332         mutex_unlock(&psmouse_mutex);
1333 }
1334 
1335 /*
1336  * psmouse_disconnect() closes and frees.
1337  */
1338 
1339 static void psmouse_disconnect(struct serio *serio)
1340 {
1341         struct psmouse *psmouse, *parent = NULL;
1342 
1343         psmouse = serio_get_drvdata(serio);
1344 
1345         sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);
1346 
1347         mutex_lock(&psmouse_mutex);
1348 
1349         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1350 
1351         /* make sure we don't have a resync in progress */
1352         mutex_unlock(&psmouse_mutex);
1353         flush_workqueue(kpsmoused_wq);
1354         mutex_lock(&psmouse_mutex);
1355 
1356         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1357                 parent = serio_get_drvdata(serio->parent);
1358                 psmouse_deactivate(parent);
1359         }
1360 
1361         if (psmouse->disconnect)
1362                 psmouse->disconnect(psmouse);
1363 
1364         if (parent && parent->pt_deactivate)
1365                 parent->pt_deactivate(parent);
1366 
1367         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1368 
1369         serio_close(serio);
1370         serio_set_drvdata(serio, NULL);
1371         input_unregister_device(psmouse->dev);
1372         kfree(psmouse);
1373 
1374         if (parent)
1375                 psmouse_activate(parent);
1376 
1377         mutex_unlock(&psmouse_mutex);
1378 }
1379 
1380 static int psmouse_switch_protocol(struct psmouse *psmouse,
1381                                    const struct psmouse_protocol *proto)
1382 {
1383         const struct psmouse_protocol *selected_proto;
1384         struct input_dev *input_dev = psmouse->dev;
1385 
1386         input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1387 
1388         if (proto && (proto->detect || proto->init)) {
1389                 psmouse_apply_defaults(psmouse);
1390 
1391                 if (proto->detect && proto->detect(psmouse, true) < 0)
1392                         return -1;
1393 
1394                 if (proto->init && proto->init(psmouse) < 0)
1395                         return -1;
1396 
1397                 psmouse->type = proto->type;
1398                 selected_proto = proto;
1399         } else {
1400                 psmouse->type = psmouse_extensions(psmouse,
1401                                                    psmouse_max_proto, true);
1402                 selected_proto = psmouse_protocol_by_type(psmouse->type);
1403         }
1404 
1405         psmouse->ignore_parity = selected_proto->ignore_parity;
1406 
1407         /*
1408          * If mouse's packet size is 3 there is no point in polling the
1409          * device in hopes to detect protocol reset - we won't get less
1410          * than 3 bytes response anyhow.
1411          */
1412         if (psmouse->pktsize == 3)
1413                 psmouse->resync_time = 0;
1414 
1415         /*
1416          * Some smart KVMs fake response to POLL command returning just
1417          * 3 bytes and messing up our resync logic, so if initial poll
1418          * fails we won't try polling the device anymore. Hopefully
1419          * such KVM will maintain initially selected protocol.
1420          */
1421         if (psmouse->resync_time && psmouse->poll(psmouse))
1422                 psmouse->resync_time = 0;
1423 
1424         snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
1425                  selected_proto->name, psmouse->vendor, psmouse->name);
1426 
1427         input_dev->name = psmouse->devname;
1428         input_dev->phys = psmouse->phys;
1429         input_dev->id.bustype = BUS_I8042;
1430         input_dev->id.vendor = 0x0002;
1431         input_dev->id.product = psmouse->type;
1432         input_dev->id.version = psmouse->model;
1433 
1434         return 0;
1435 }
1436 
1437 /*
1438  * psmouse_connect() is a callback from the serio module when
1439  * an unhandled serio port is found.
1440  */
1441 static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
1442 {
1443         struct psmouse *psmouse, *parent = NULL;
1444         struct input_dev *input_dev;
1445         int retval = 0, error = -ENOMEM;
1446 
1447         mutex_lock(&psmouse_mutex);
1448 
1449         /*
1450          * If this is a pass-through port deactivate parent so the device
1451          * connected to this port can be successfully identified
1452          */
1453         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1454                 parent = serio_get_drvdata(serio->parent);
1455                 psmouse_deactivate(parent);
1456         }
1457 
1458         psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
1459         input_dev = input_allocate_device();
1460         if (!psmouse || !input_dev)
1461                 goto err_free;
1462 
1463         ps2_init(&psmouse->ps2dev, serio);
1464         INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
1465         psmouse->dev = input_dev;
1466         snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
1467 
1468         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1469 
1470         serio_set_drvdata(serio, psmouse);
1471 
1472         error = serio_open(serio, drv);
1473         if (error)
1474                 goto err_clear_drvdata;
1475 
1476         if (psmouse_probe(psmouse) < 0) {
1477                 error = -ENODEV;
1478                 goto err_close_serio;
1479         }
1480 
1481         psmouse->rate = psmouse_rate;
1482         psmouse->resolution = psmouse_resolution;
1483         psmouse->resetafter = psmouse_resetafter;
1484         psmouse->resync_time = parent ? 0 : psmouse_resync_time;
1485         psmouse->smartscroll = psmouse_smartscroll;
1486 
1487         psmouse_switch_protocol(psmouse, NULL);
1488 
1489         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1490         psmouse_initialize(psmouse);
1491 
1492         error = input_register_device(psmouse->dev);
1493         if (error)
1494                 goto err_protocol_disconnect;
1495 
1496         if (parent && parent->pt_activate)
1497                 parent->pt_activate(parent);
1498 
1499         error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
1500         if (error)
1501                 goto err_pt_deactivate;
1502 
1503         psmouse_activate(psmouse);
1504 
1505  out:
1506         /* If this is a pass-through port the parent needs to be re-activated */
1507         if (parent)
1508                 psmouse_activate(parent);
1509 
1510         mutex_unlock(&psmouse_mutex);
1511         return retval;
1512 
1513  err_pt_deactivate:
1514         if (parent && parent->pt_deactivate)
1515                 parent->pt_deactivate(parent);
1516         input_unregister_device(psmouse->dev);
1517         input_dev = NULL; /* so we don't try to free it below */
1518  err_protocol_disconnect:
1519         if (psmouse->disconnect)
1520                 psmouse->disconnect(psmouse);
1521         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1522  err_close_serio:
1523         serio_close(serio);
1524  err_clear_drvdata:
1525         serio_set_drvdata(serio, NULL);
1526  err_free:
1527         input_free_device(input_dev);
1528         kfree(psmouse);
1529 
1530         retval = error;
1531         goto out;
1532 }
1533 
1534 
1535 static int psmouse_reconnect(struct serio *serio)
1536 {
1537         struct psmouse *psmouse = serio_get_drvdata(serio);
1538         struct psmouse *parent = NULL;
1539         unsigned char type;
1540         int rc = -1;
1541 
1542         mutex_lock(&psmouse_mutex);
1543 
1544         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1545                 parent = serio_get_drvdata(serio->parent);
1546                 psmouse_deactivate(parent);
1547         }
1548 
1549         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1550 
1551         if (psmouse->reconnect) {
1552                 if (psmouse->reconnect(psmouse))
1553                         goto out;
1554         } else {
1555                 psmouse_reset(psmouse);
1556 
1557                 if (psmouse_probe(psmouse) < 0)
1558                         goto out;
1559 
1560                 type = psmouse_extensions(psmouse, psmouse_max_proto, false);
1561                 if (psmouse->type != type)
1562                         goto out;
1563         }
1564 
1565         /*
1566          * OK, the device type (and capabilities) match the old one,
1567          * we can continue using it, complete initialization
1568          */
1569         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1570 
1571         psmouse_initialize(psmouse);
1572 
1573         if (parent && parent->pt_activate)
1574                 parent->pt_activate(parent);
1575 
1576         psmouse_activate(psmouse);
1577         rc = 0;
1578 
1579 out:
1580         /* If this is a pass-through port the parent waits to be activated */
1581         if (parent)
1582                 psmouse_activate(parent);
1583 
1584         mutex_unlock(&psmouse_mutex);
1585         return rc;
1586 }
1587 
1588 static struct serio_device_id psmouse_serio_ids[] = {
1589         {
1590                 .type   = SERIO_8042,
1591                 .proto  = SERIO_ANY,
1592                 .id     = SERIO_ANY,
1593                 .extra  = SERIO_ANY,
1594         },
1595         {
1596                 .type   = SERIO_PS_PSTHRU,
1597                 .proto  = SERIO_ANY,
1598                 .id     = SERIO_ANY,
1599                 .extra  = SERIO_ANY,
1600         },
1601         { 0 }
1602 };
1603 
1604 MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
1605 
1606 static struct serio_driver psmouse_drv = {
1607         .driver         = {
1608                 .name   = "psmouse",
1609         },
1610         .description    = DRIVER_DESC,
1611         .id_table       = psmouse_serio_ids,
1612         .interrupt      = psmouse_interrupt,
1613         .connect        = psmouse_connect,
1614         .reconnect      = psmouse_reconnect,
1615         .disconnect     = psmouse_disconnect,
1616         .cleanup        = psmouse_cleanup,
1617 };
1618 
1619 ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
1620                                  char *buf)
1621 {
1622         struct serio *serio = to_serio_port(dev);
1623         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1624         struct psmouse *psmouse;
1625 
1626         psmouse = serio_get_drvdata(serio);
1627 
1628         return attr->show(psmouse, attr->data, buf);
1629 }
1630 
1631 ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
1632                                 const char *buf, size_t count)
1633 {
1634         struct serio *serio = to_serio_port(dev);
1635         struct psmouse_attribute *attr = to_psmouse_attr(devattr);
1636         struct psmouse *psmouse, *parent = NULL;
1637         int retval;
1638 
1639         retval = mutex_lock_interruptible(&psmouse_mutex);
1640         if (retval)
1641                 goto out;
1642 
1643         psmouse = serio_get_drvdata(serio);
1644 
1645         if (attr->protect) {
1646                 if (psmouse->state == PSMOUSE_IGNORE) {
1647                         retval = -ENODEV;
1648                         goto out_unlock;
1649                 }
1650 
1651                 if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1652                         parent = serio_get_drvdata(serio->parent);
1653                         psmouse_deactivate(parent);
1654                 }
1655 
1656                 psmouse_deactivate(psmouse);
1657         }
1658 
1659         retval = attr->set(psmouse, attr->data, buf, count);
1660 
1661         if (attr->protect) {
1662                 if (retval != -ENODEV)
1663                         psmouse_activate(psmouse);
1664 
1665                 if (parent)
1666                         psmouse_activate(parent);
1667         }
1668 
1669  out_unlock:
1670         mutex_unlock(&psmouse_mutex);
1671  out:
1672         return retval;
1673 }
1674 
1675 static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
1676 {
1677         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1678 
1679         return sprintf(buf, "%u\n", *field);
1680 }
1681 
1682 static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
1683 {
1684         unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
1685         unsigned int value;
1686         int err;
1687 
1688         err = kstrtouint(buf, 10, &value);
1689         if (err)
1690                 return err;
1691 
1692         *field = value;
1693 
1694         return count;
1695 }
1696 
1697 static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
1698 {
1699         return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
1700 }
1701 
1702 static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1703 {
1704         struct serio *serio = psmouse->ps2dev.serio;
1705         struct psmouse *parent = NULL;
1706         struct input_dev *old_dev, *new_dev;
1707         const struct psmouse_protocol *proto, *old_proto;
1708         int error;
1709         int retry = 0;
1710 
1711         proto = psmouse_protocol_by_name(buf, count);
1712         if (!proto)
1713                 return -EINVAL;
1714 
1715         if (psmouse->type == proto->type)
1716                 return count;
1717 
1718         new_dev = input_allocate_device();
1719         if (!new_dev)
1720                 return -ENOMEM;
1721 
1722         while (!list_empty(&serio->children)) {
1723                 if (++retry > 3) {
1724                         psmouse_warn(psmouse,
1725                                      "failed to destroy children ports, protocol change aborted.\n");
1726                         input_free_device(new_dev);
1727                         return -EIO;
1728                 }
1729 
1730                 mutex_unlock(&psmouse_mutex);
1731                 serio_unregister_child_port(serio);
1732                 mutex_lock(&psmouse_mutex);
1733 
1734                 if (serio->drv != &psmouse_drv) {
1735                         input_free_device(new_dev);
1736                         return -ENODEV;
1737                 }
1738 
1739                 if (psmouse->type == proto->type) {
1740                         input_free_device(new_dev);
1741                         return count; /* switched by other thread */
1742                 }
1743         }
1744 
1745         if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
1746                 parent = serio_get_drvdata(serio->parent);
1747                 if (parent->pt_deactivate)
1748                         parent->pt_deactivate(parent);
1749         }
1750 
1751         old_dev = psmouse->dev;
1752         old_proto = psmouse_protocol_by_type(psmouse->type);
1753 
1754         if (psmouse->disconnect)
1755                 psmouse->disconnect(psmouse);
1756 
1757         psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1758 
1759         psmouse->dev = new_dev;
1760         psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1761 
1762         if (psmouse_switch_protocol(psmouse, proto) < 0) {
1763                 psmouse_reset(psmouse);
1764                 /* default to PSMOUSE_PS2 */
1765                 psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
1766         }
1767 
1768         psmouse_initialize(psmouse);
1769         psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1770 
1771         error = input_register_device(psmouse->dev);
1772         if (error) {
1773                 if (psmouse->disconnect)
1774                         psmouse->disconnect(psmouse);
1775 
1776                 psmouse_set_state(psmouse, PSMOUSE_IGNORE);
1777                 input_free_device(new_dev);
1778                 psmouse->dev = old_dev;
1779                 psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
1780                 psmouse_switch_protocol(psmouse, old_proto);
1781                 psmouse_initialize(psmouse);
1782                 psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
1783 
1784                 return error;
1785         }
1786 
1787         input_unregister_device(old_dev);
1788 
1789         if (parent && parent->pt_activate)
1790                 parent->pt_activate(parent);
1791 
1792         return count;
1793 }
1794 
1795 static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1796 {
1797         unsigned int value;
1798         int err;
1799 
1800         err = kstrtouint(buf, 10, &value);
1801         if (err)
1802                 return err;
1803 
1804         psmouse->set_rate(psmouse, value);
1805         return count;
1806 }
1807 
1808 static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
1809 {
1810         unsigned int value;
1811         int err;
1812 
1813         err = kstrtouint(buf, 10, &value);
1814         if (err)
1815                 return err;
1816 
1817         psmouse->set_resolution(psmouse, value);
1818         return count;
1819 }
1820 
1821 
1822 static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
1823 {
1824         const struct psmouse_protocol *proto;
1825 
1826         if (!val)
1827                 return -EINVAL;
1828 
1829         proto = psmouse_protocol_by_name(val, strlen(val));
1830 
1831         if (!proto || !proto->maxproto)
1832                 return -EINVAL;
1833 
1834         *((unsigned int *)kp->arg) = proto->type;
1835 
1836         return 0;
1837 }
1838 
1839 static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
1840 {
1841         int type = *((unsigned int *)kp->arg);
1842 
1843         return sprintf(buffer, "%s", psmouse_protocol_by_type(type)->name);
1844 }
1845 
1846 static int __init psmouse_init(void)
1847 {
1848         int err;
1849 
1850         lifebook_module_init();
1851         synaptics_module_init();
1852         hgpk_module_init();
1853 
1854         kpsmoused_wq = create_singlethread_workqueue("kpsmoused");
1855         if (!kpsmoused_wq) {
1856                 pr_err("failed to create kpsmoused workqueue\n");
1857                 return -ENOMEM;
1858         }
1859 
1860         err = serio_register_driver(&psmouse_drv);
1861         if (err)
1862                 destroy_workqueue(kpsmoused_wq);
1863 
1864         return err;
1865 }
1866 
1867 static void __exit psmouse_exit(void)
1868 {
1869         serio_unregister_driver(&psmouse_drv);
1870         destroy_workqueue(kpsmoused_wq);
1871 }
1872 
1873 module_init(psmouse_init);
1874 module_exit(psmouse_exit);
1875 

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