blob: 78c3ea75da2a056b2799045c6c2329f5834a8705 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Input driver to ExplorerPS/2 device driver module.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 * Copyright (c) 2004 Dmitry Torokhov
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 */
11
Dmitry Torokhov4f004692005-09-15 02:01:38 -050012#define MOUSEDEV_MINOR_BASE 32
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#define MOUSEDEV_MINORS 32
14#define MOUSEDEV_MIX 31
15
16#include <linux/slab.h>
17#include <linux/poll.h>
18#include <linux/module.h>
19#include <linux/moduleparam.h>
20#include <linux/init.h>
21#include <linux/input.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/random.h>
23#include <linux/major.h>
24#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
26#include <linux/miscdevice.h>
27#endif
28
29MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
30MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
31MODULE_LICENSE("GPL");
32
33#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
34#define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
35#endif
36#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
37#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
38#endif
39
40static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
Dmitry Torokhov84c12b22005-12-11 12:41:03 -050041module_param(xres, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042MODULE_PARM_DESC(xres, "Horizontal screen resolution");
43
44static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
Dmitry Torokhov84c12b22005-12-11 12:41:03 -050045module_param(yres, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046MODULE_PARM_DESC(yres, "Vertical screen resolution");
47
48static unsigned tap_time = 200;
Dmitry Torokhov84c12b22005-12-11 12:41:03 -050049module_param(tap_time, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
51
52struct mousedev_hw_data {
53 int dx, dy, dz;
54 int x, y;
55 int abs_event;
56 unsigned long buttons;
57};
58
59struct mousedev {
60 int exist;
61 int open;
62 int minor;
63 char name[16];
Dmitry Torokhov464b2412007-08-30 00:22:24 -040064 struct input_handle handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 wait_queue_head_t wait;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040066 struct list_head client_list;
Dmitry Torokhov464b2412007-08-30 00:22:24 -040067 spinlock_t client_lock; /* protects client_list */
68 struct mutex mutex;
Dmitry Torokhov9657d752007-06-14 23:32:24 -040069 struct device dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Dmitry Torokhovd542ed82007-04-12 01:30:15 -040071 struct list_head mixdev_node;
72 int mixdev_open;
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 struct mousedev_hw_data packet;
75 unsigned int pkt_count;
76 int old_x[4], old_y[4];
77 int frac_dx, frac_dy;
78 unsigned long touch;
79};
80
81enum mousedev_emul {
82 MOUSEDEV_EMUL_PS2,
83 MOUSEDEV_EMUL_IMPS,
84 MOUSEDEV_EMUL_EXPS
85};
86
87struct mousedev_motion {
88 int dx, dy, dz;
89 unsigned long buttons;
90};
91
92#define PACKET_QUEUE_LEN 16
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040093struct mousedev_client {
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 struct fasync_struct *fasync;
95 struct mousedev *mousedev;
96 struct list_head node;
97
98 struct mousedev_motion packets[PACKET_QUEUE_LEN];
99 unsigned int head, tail;
100 spinlock_t packet_lock;
101 int pos_x, pos_y;
102
103 signed char ps2[6];
104 unsigned char ready, buffer, bufsiz;
105 unsigned char imexseq, impsseq;
106 enum mousedev_emul mode;
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700107 unsigned long last_buttons;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108};
109
110#define MOUSEDEV_SEQ_LEN 6
111
112static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
113static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
114
115static struct input_handler mousedev_handler;
116
117static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400118static DEFINE_MUTEX(mousedev_table_mutex);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400119static struct mousedev *mousedev_mix;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400120static LIST_HEAD(mousedev_mix_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400122static void mixdev_open_devices(void);
123static void mixdev_close_devices(void);
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
126#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
127
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400128static void mousedev_touchpad_event(struct input_dev *dev,
129 struct mousedev *mousedev,
130 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
132 int size, tmp;
133 enum { FRACTION_DENOM = 128 };
134
Dmitry Torokhov0d9d93c2007-04-12 01:31:55 -0400135 switch (code) {
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400136
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400137 case ABS_X:
138 fx(0) = value;
139 if (mousedev->touch && mousedev->pkt_count >= 2) {
140 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
141 if (size == 0)
142 size = 256 * 2;
143 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
144 tmp += mousedev->frac_dx;
145 mousedev->packet.dx = tmp / FRACTION_DENOM;
146 mousedev->frac_dx =
147 tmp - mousedev->packet.dx * FRACTION_DENOM;
148 }
149 break;
150
151 case ABS_Y:
152 fy(0) = value;
153 if (mousedev->touch && mousedev->pkt_count >= 2) {
154 /* use X size to keep the same scale */
155 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
156 if (size == 0)
157 size = 256 * 2;
158 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
159 tmp += mousedev->frac_dy;
160 mousedev->packet.dy = tmp / FRACTION_DENOM;
161 mousedev->frac_dy = tmp -
162 mousedev->packet.dy * FRACTION_DENOM;
163 }
164 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
166}
167
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400168static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
169 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
171 int size;
172
173 switch (code) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400175 case ABS_X:
176 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
177 if (size == 0)
178 size = xres ? : 1;
179 if (value > dev->absmax[ABS_X])
180 value = dev->absmax[ABS_X];
181 if (value < dev->absmin[ABS_X])
182 value = dev->absmin[ABS_X];
183 mousedev->packet.x =
184 ((value - dev->absmin[ABS_X]) * xres) / size;
185 mousedev->packet.abs_event = 1;
186 break;
187
188 case ABS_Y:
189 size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
190 if (size == 0)
191 size = yres ? : 1;
192 if (value > dev->absmax[ABS_Y])
193 value = dev->absmax[ABS_Y];
194 if (value < dev->absmin[ABS_Y])
195 value = dev->absmin[ABS_Y];
196 mousedev->packet.y = yres -
197 ((value - dev->absmin[ABS_Y]) * yres) / size;
198 mousedev->packet.abs_event = 1;
199 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
201}
202
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400203static void mousedev_rel_event(struct mousedev *mousedev,
204 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
206 switch (code) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400207 case REL_X:
208 mousedev->packet.dx += value;
209 break;
210
211 case REL_Y:
212 mousedev->packet.dy -= value;
213 break;
214
215 case REL_WHEEL:
216 mousedev->packet.dz -= value;
217 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 }
219}
220
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400221static void mousedev_key_event(struct mousedev *mousedev,
222 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
224 int index;
225
226 switch (code) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400227
228 case BTN_TOUCH:
229 case BTN_0:
230 case BTN_LEFT: index = 0; break;
231
232 case BTN_STYLUS:
233 case BTN_1:
234 case BTN_RIGHT: index = 1; break;
235
236 case BTN_2:
237 case BTN_FORWARD:
238 case BTN_STYLUS2:
239 case BTN_MIDDLE: index = 2; break;
240
241 case BTN_3:
242 case BTN_BACK:
243 case BTN_SIDE: index = 3; break;
244
245 case BTN_4:
246 case BTN_EXTRA: index = 4; break;
247
248 default: return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 }
250
251 if (value) {
252 set_bit(index, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400253 set_bit(index, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 } else {
255 clear_bit(index, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400256 clear_bit(index, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
258}
259
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400260static void mousedev_notify_readers(struct mousedev *mousedev,
261 struct mousedev_hw_data *packet)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400263 struct mousedev_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 struct mousedev_motion *p;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400265 unsigned int new_head;
Dmitry Torokhov81211522005-06-01 02:39:36 -0500266 int wake_readers = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400268 rcu_read_lock();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400269 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
270
271 /* Just acquire the lock, interrupts already disabled */
272 spin_lock(&client->packet_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400274 p = &client->packets[client->head];
275 if (client->ready && p->buttons != mousedev->packet.buttons) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400276 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400277 if (new_head != client->tail) {
278 p = &client->packets[client->head = new_head];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 memset(p, 0, sizeof(struct mousedev_motion));
280 }
281 }
282
283 if (packet->abs_event) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400284 p->dx += packet->x - client->pos_x;
285 p->dy += packet->y - client->pos_y;
286 client->pos_x = packet->x;
287 client->pos_y = packet->y;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 }
289
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400290 client->pos_x += packet->dx;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400291 client->pos_x = client->pos_x < 0 ?
292 0 : (client->pos_x >= xres ? xres : client->pos_x);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400293 client->pos_y += packet->dy;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400294 client->pos_y = client->pos_y < 0 ?
295 0 : (client->pos_y >= yres ? yres : client->pos_y);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 p->dx += packet->dx;
298 p->dy += packet->dy;
299 p->dz += packet->dz;
300 p->buttons = mousedev->packet.buttons;
301
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400302 if (p->dx || p->dy || p->dz ||
303 p->buttons != client->last_buttons)
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400304 client->ready = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400306 spin_unlock(&client->packet_lock);
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700307
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400308 if (client->ready) {
309 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhov81211522005-06-01 02:39:36 -0500310 wake_readers = 1;
311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400313 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Dmitry Torokhov81211522005-06-01 02:39:36 -0500315 if (wake_readers)
316 wake_up_interruptible(&mousedev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
319static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
320{
321 if (!value) {
322 if (mousedev->touch &&
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400323 time_before(jiffies,
324 mousedev->touch + msecs_to_jiffies(tap_time))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 /*
326 * Toggle left button to emulate tap.
327 * We rely on the fact that mousedev_mix always has 0
328 * motion packet so we won't mess current position.
329 */
330 set_bit(0, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400331 set_bit(0, &mousedev_mix->packet.buttons);
332 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400333 mousedev_notify_readers(mousedev_mix,
334 &mousedev_mix->packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 clear_bit(0, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400336 clear_bit(0, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 }
338 mousedev->touch = mousedev->pkt_count = 0;
339 mousedev->frac_dx = 0;
340 mousedev->frac_dy = 0;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400341
342 } else if (!mousedev->touch)
343 mousedev->touch = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400346static void mousedev_event(struct input_handle *handle,
347 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348{
349 struct mousedev *mousedev = handle->private;
350
351 switch (type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400353 case EV_ABS:
354 /* Ignore joysticks */
355 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
356 return;
357
358 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
359 mousedev_touchpad_event(handle->dev,
360 mousedev, code, value);
361 else
362 mousedev_abs_event(handle->dev, mousedev, code, value);
363
364 break;
365
366 case EV_REL:
367 mousedev_rel_event(mousedev, code, value);
368 break;
369
370 case EV_KEY:
371 if (value != 2) {
372 if (code == BTN_TOUCH &&
373 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
374 mousedev_touchpad_touch(mousedev, value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 else
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400376 mousedev_key_event(mousedev, code, value);
377 }
378 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400380 case EV_SYN:
381 if (code == SYN_REPORT) {
382 if (mousedev->touch) {
383 mousedev->pkt_count++;
384 /*
385 * Input system eats duplicate events,
386 * but we need all of them to do correct
387 * averaging so apply present one forward
388 */
389 fx(0) = fx(1);
390 fy(0) = fy(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400393 mousedev_notify_readers(mousedev, &mousedev->packet);
394 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400396 mousedev->packet.dx = mousedev->packet.dy =
397 mousedev->packet.dz = 0;
398 mousedev->packet.abs_event = 0;
399 }
400 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 }
402}
403
404static int mousedev_fasync(int fd, struct file *file, int on)
405{
406 int retval;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400407 struct mousedev_client *client = file->private_data;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400408
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400409 retval = fasync_helper(fd, file, on, &client->fasync);
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 return retval < 0 ? retval : 0;
412}
413
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400414static void mousedev_free(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400416 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 kfree(mousedev);
419}
420
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400421static int mousedev_open_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400423 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400425 retval = mutex_lock_interruptible(&mousedev->mutex);
426 if (retval)
427 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400429 if (mousedev->minor == MOUSEDEV_MIX)
430 mixdev_open_devices();
431 else if (!mousedev->exist)
432 retval = -ENODEV;
Oliver Neukum06445012007-10-12 14:18:40 -0400433 else if (!mousedev->open++) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400434 retval = input_open_device(&mousedev->handle);
Oliver Neukum06445012007-10-12 14:18:40 -0400435 if (retval)
436 mousedev->open--;
437 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400439 mutex_unlock(&mousedev->mutex);
440 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441}
442
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400443static void mousedev_close_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400445 mutex_lock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400446
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400447 if (mousedev->minor == MOUSEDEV_MIX)
448 mixdev_close_devices();
449 else if (mousedev->exist && !--mousedev->open)
450 input_close_device(&mousedev->handle);
451
452 mutex_unlock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400453}
454
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400455/*
456 * Open all available devices so they can all be multiplexed in one.
457 * stream. Note that this function is called with mousedev_mix->mutex
458 * held.
459 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400460static void mixdev_open_devices(void)
461{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400463
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400464 if (mousedev_mix->open++)
465 return;
466
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400467 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400468 if (!mousedev->mixdev_open) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400469 if (mousedev_open_device(mousedev))
470 continue;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400471
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400472 mousedev->mixdev_open = 1;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400473 }
474 }
475}
476
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400477/*
478 * Close all devices that were opened as part of multiplexed
479 * device. Note that this function is called with mousedev_mix->mutex
480 * held.
481 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400482static void mixdev_close_devices(void)
483{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400484 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400485
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400486 if (--mousedev_mix->open)
487 return;
488
489 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400490 if (mousedev->mixdev_open) {
491 mousedev->mixdev_open = 0;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400492 mousedev_close_device(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 }
494 }
495}
496
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400497
498static void mousedev_attach_client(struct mousedev *mousedev,
499 struct mousedev_client *client)
500{
501 spin_lock(&mousedev->client_lock);
502 list_add_tail_rcu(&client->node, &mousedev->client_list);
503 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400504 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400505}
506
507static void mousedev_detach_client(struct mousedev *mousedev,
508 struct mousedev_client *client)
509{
510 spin_lock(&mousedev->client_lock);
511 list_del_rcu(&client->node);
512 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400513 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400514}
515
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400516static int mousedev_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400518 struct mousedev_client *client = file->private_data;
519 struct mousedev *mousedev = client->mousedev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 mousedev_fasync(-1, file, 0);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400522 mousedev_detach_client(mousedev, client);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400523 kfree(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400525 mousedev_close_device(mousedev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400526 put_device(&mousedev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 return 0;
529}
530
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400531static int mousedev_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400533 struct mousedev_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400535 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 int i;
537
538#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
539 if (imajor(inode) == MISC_MAJOR)
540 i = MOUSEDEV_MIX;
541 else
542#endif
543 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
544
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400545 if (i >= MOUSEDEV_MINORS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 return -ENODEV;
547
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400548 error = mutex_lock_interruptible(&mousedev_table_mutex);
549 if (error)
550 return error;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400551 mousedev = mousedev_table[i];
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400552 if (mousedev)
553 get_device(&mousedev->dev);
554 mutex_unlock(&mousedev_table_mutex);
555
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400556 if (!mousedev)
557 return -ENODEV;
558
559 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400560 if (!client) {
561 error = -ENOMEM;
562 goto err_put_mousedev;
563 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400565 spin_lock_init(&client->packet_lock);
566 client->pos_x = xres / 2;
567 client->pos_y = yres / 2;
568 client->mousedev = mousedev;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400569 mousedev_attach_client(mousedev, client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400571 error = mousedev_open_device(mousedev);
572 if (error)
573 goto err_free_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400575 file->private_data = client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return 0;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400577
578 err_free_client:
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400579 mousedev_detach_client(mousedev, client);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400580 kfree(client);
581 err_put_mousedev:
582 put_device(&mousedev->dev);
583 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
585
586static inline int mousedev_limit_delta(int delta, int limit)
587{
588 return delta > limit ? limit : (delta < -limit ? -limit : delta);
589}
590
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400591static void mousedev_packet(struct mousedev_client *client,
592 signed char *ps2_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400594 struct mousedev_motion *p = &client->packets[client->tail];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400596 ps2_data[0] = 0x08 |
597 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
599 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
600 p->dx -= ps2_data[1];
601 p->dy -= ps2_data[2];
602
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400603 switch (client->mode) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400604 case MOUSEDEV_EMUL_EXPS:
605 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
606 p->dz -= ps2_data[3];
607 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
608 client->bufsiz = 4;
609 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400611 case MOUSEDEV_EMUL_IMPS:
612 ps2_data[0] |=
613 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
614 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
615 p->dz -= ps2_data[3];
616 client->bufsiz = 4;
617 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400619 case MOUSEDEV_EMUL_PS2:
620 default:
621 ps2_data[0] |=
622 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
623 p->dz = 0;
624 client->bufsiz = 3;
625 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 }
627
628 if (!p->dx && !p->dy && !p->dz) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400629 if (client->tail == client->head) {
630 client->ready = 0;
631 client->last_buttons = p->buttons;
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700632 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400633 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635}
636
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400637static void mousedev_generate_response(struct mousedev_client *client,
638 int command)
639{
640 client->ps2[0] = 0xfa; /* ACK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400642 switch (command) {
643
644 case 0xeb: /* Poll */
645 mousedev_packet(client, &client->ps2[1]);
646 client->bufsiz++; /* account for leading ACK */
647 break;
648
649 case 0xf2: /* Get ID */
650 switch (client->mode) {
651 case MOUSEDEV_EMUL_PS2:
652 client->ps2[1] = 0;
653 break;
654 case MOUSEDEV_EMUL_IMPS:
655 client->ps2[1] = 3;
656 break;
657 case MOUSEDEV_EMUL_EXPS:
658 client->ps2[1] = 4;
659 break;
660 }
661 client->bufsiz = 2;
662 break;
663
664 case 0xe9: /* Get info */
665 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
666 client->bufsiz = 4;
667 break;
668
669 case 0xff: /* Reset */
670 client->impsseq = client->imexseq = 0;
671 client->mode = MOUSEDEV_EMUL_PS2;
672 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
673 client->bufsiz = 3;
674 break;
675
676 default:
677 client->bufsiz = 1;
678 break;
679 }
680 client->buffer = client->bufsiz;
681}
682
683static ssize_t mousedev_write(struct file *file, const char __user *buffer,
684 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400686 struct mousedev_client *client = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 unsigned char c;
688 unsigned int i;
689
690 for (i = 0; i < count; i++) {
691
692 if (get_user(c, buffer + i))
693 return -EFAULT;
694
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400695 spin_lock_irq(&client->packet_lock);
696
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400697 if (c == mousedev_imex_seq[client->imexseq]) {
698 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
699 client->imexseq = 0;
700 client->mode = MOUSEDEV_EMUL_EXPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400702 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400703 client->imexseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400705 if (c == mousedev_imps_seq[client->impsseq]) {
706 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
707 client->impsseq = 0;
708 client->mode = MOUSEDEV_EMUL_IMPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400710 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400711 client->impsseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400713 mousedev_generate_response(client, c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400715 spin_unlock_irq(&client->packet_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 }
717
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400718 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400719 wake_up_interruptible(&client->mousedev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
721 return count;
722}
723
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400724static ssize_t mousedev_read(struct file *file, char __user *buffer,
725 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400727 struct mousedev_client *client = file->private_data;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400728 struct mousedev *mousedev = client->mousedev;
729 signed char data[sizeof(client->ps2)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 int retval = 0;
731
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400732 if (!client->ready && !client->buffer && mousedev->exist &&
733 (file->f_flags & O_NONBLOCK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 return -EAGAIN;
735
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400736 retval = wait_event_interruptible(mousedev->wait,
737 !mousedev->exist || client->ready || client->buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 if (retval)
739 return retval;
740
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400741 if (!mousedev->exist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 return -ENODEV;
743
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400744 spin_lock_irq(&client->packet_lock);
745
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400746 if (!client->buffer && client->ready) {
747 mousedev_packet(client, client->ps2);
748 client->buffer = client->bufsiz;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 }
750
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400751 if (count > client->buffer)
752 count = client->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400754 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400755 client->buffer -= count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400757 spin_unlock_irq(&client->packet_lock);
758
759 if (copy_to_user(buffer, data, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 return -EFAULT;
761
762 return count;
763}
764
765/* No kernel lock - fine */
766static unsigned int mousedev_poll(struct file *file, poll_table *wait)
767{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400768 struct mousedev_client *client = file->private_data;
769 struct mousedev *mousedev = client->mousedev;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400770
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400771 poll_wait(file, &mousedev->wait, wait);
772 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
773 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400776static const struct file_operations mousedev_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 .owner = THIS_MODULE,
778 .read = mousedev_read,
779 .write = mousedev_write,
780 .poll = mousedev_poll,
781 .open = mousedev_open,
782 .release = mousedev_release,
783 .fasync = mousedev_fasync,
784};
785
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400786static int mousedev_install_chrdev(struct mousedev *mousedev)
787{
788 mousedev_table[mousedev->minor] = mousedev;
789 return 0;
790}
791
792static void mousedev_remove_chrdev(struct mousedev *mousedev)
793{
794 mutex_lock(&mousedev_table_mutex);
795 mousedev_table[mousedev->minor] = NULL;
796 mutex_unlock(&mousedev_table_mutex);
797}
798
799/*
800 * Mark device non-existent. This disables writes, ioctls and
801 * prevents new users from opening the device. Already posted
802 * blocking reads will stay, however new ones will fail.
803 */
804static void mousedev_mark_dead(struct mousedev *mousedev)
805{
806 mutex_lock(&mousedev->mutex);
807 mousedev->exist = 0;
808 mutex_unlock(&mousedev->mutex);
809}
810
811/*
812 * Wake up users waiting for IO so they can disconnect from
813 * dead device.
814 */
815static void mousedev_hangup(struct mousedev *mousedev)
816{
817 struct mousedev_client *client;
818
819 spin_lock(&mousedev->client_lock);
820 list_for_each_entry(client, &mousedev->client_list, node)
821 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
822 spin_unlock(&mousedev->client_lock);
823
824 wake_up_interruptible(&mousedev->wait);
825}
826
827static void mousedev_cleanup(struct mousedev *mousedev)
828{
829 struct input_handle *handle = &mousedev->handle;
830
831 mousedev_mark_dead(mousedev);
832 mousedev_hangup(mousedev);
833 mousedev_remove_chrdev(mousedev);
834
835 /* mousedev is marked dead so no one else accesses mousedev->open */
836 if (mousedev->open)
837 input_close_device(handle);
838}
839
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400840static struct mousedev *mousedev_create(struct input_dev *dev,
841 struct input_handler *handler,
842 int minor)
843{
844 struct mousedev *mousedev;
845 int error;
846
847 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
848 if (!mousedev) {
849 error = -ENOMEM;
850 goto err_out;
851 }
852
853 INIT_LIST_HEAD(&mousedev->client_list);
854 INIT_LIST_HEAD(&mousedev->mixdev_node);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400855 spin_lock_init(&mousedev->client_lock);
856 mutex_init(&mousedev->mutex);
857 lockdep_set_subclass(&mousedev->mutex,
858 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400859 init_waitqueue_head(&mousedev->wait);
860
861 if (minor == MOUSEDEV_MIX)
862 strlcpy(mousedev->name, "mice", sizeof(mousedev->name));
863 else
864 snprintf(mousedev->name, sizeof(mousedev->name),
865 "mouse%d", minor);
866
867 mousedev->minor = minor;
868 mousedev->exist = 1;
869 mousedev->handle.dev = dev;
870 mousedev->handle.name = mousedev->name;
871 mousedev->handle.handler = handler;
872 mousedev->handle.private = mousedev;
873
874 strlcpy(mousedev->dev.bus_id, mousedev->name,
875 sizeof(mousedev->dev.bus_id));
876 mousedev->dev.class = &input_class;
877 if (dev)
878 mousedev->dev.parent = &dev->dev;
879 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
880 mousedev->dev.release = mousedev_free;
881 device_initialize(&mousedev->dev);
882
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400883 if (minor != MOUSEDEV_MIX) {
884 error = input_register_handle(&mousedev->handle);
885 if (error)
886 goto err_free_mousedev;
887 }
888
889 error = mousedev_install_chrdev(mousedev);
890 if (error)
891 goto err_unregister_handle;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400892
893 error = device_add(&mousedev->dev);
894 if (error)
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400895 goto err_cleanup_mousedev;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400896
897 return mousedev;
898
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400899 err_cleanup_mousedev:
900 mousedev_cleanup(mousedev);
901 err_unregister_handle:
902 if (minor != MOUSEDEV_MIX)
903 input_unregister_handle(&mousedev->handle);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400904 err_free_mousedev:
905 put_device(&mousedev->dev);
906 err_out:
907 return ERR_PTR(error);
908}
909
910static void mousedev_destroy(struct mousedev *mousedev)
911{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400912 device_del(&mousedev->dev);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400913 mousedev_cleanup(mousedev);
914 if (mousedev->minor != MOUSEDEV_MIX)
915 input_unregister_handle(&mousedev->handle);
916 put_device(&mousedev->dev);
917}
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400918
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400919static int mixdev_add_device(struct mousedev *mousedev)
920{
921 int retval;
922
923 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
924 if (retval)
925 return retval;
926
927 if (mousedev_mix->open) {
928 retval = mousedev_open_device(mousedev);
929 if (retval)
930 goto out;
931
932 mousedev->mixdev_open = 1;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400933 }
934
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400935 get_device(&mousedev->dev);
936 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
937
938 out:
939 mutex_unlock(&mousedev_mix->mutex);
940 return retval;
941}
942
943static void mixdev_remove_device(struct mousedev *mousedev)
944{
945 mutex_lock(&mousedev_mix->mutex);
946
947 if (mousedev->mixdev_open) {
948 mousedev->mixdev_open = 0;
949 mousedev_close_device(mousedev);
950 }
951
952 list_del_init(&mousedev->mixdev_node);
953 mutex_unlock(&mousedev_mix->mutex);
954
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400955 put_device(&mousedev->dev);
956}
957
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400958static int mousedev_connect(struct input_handler *handler,
959 struct input_dev *dev,
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400960 const struct input_device_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
962 struct mousedev *mousedev;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400963 int minor;
964 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400966 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
967 if (!mousedev_table[minor])
968 break;
969
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 if (minor == MOUSEDEV_MINORS) {
971 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400972 return -ENFILE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 }
974
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400975 mousedev = mousedev_create(dev, handler, minor);
976 if (IS_ERR(mousedev))
977 return PTR_ERR(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400979 error = mixdev_add_device(mousedev);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400980 if (error) {
981 mousedev_destroy(mousedev);
982 return error;
983 }
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400984
985 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986}
987
988static void mousedev_disconnect(struct input_handle *handle)
989{
990 struct mousedev *mousedev = handle->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400992 mixdev_remove_device(mousedev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400993 mousedev_destroy(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994}
995
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400996static const struct input_device_id mousedev_ids[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400998 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
999 INPUT_DEVICE_ID_MATCH_KEYBIT |
1000 INPUT_DEVICE_ID_MATCH_RELBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001001 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1002 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1003 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001004 }, /* A mouse like device, at least one button,
1005 two relative axes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001007 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1008 INPUT_DEVICE_ID_MATCH_RELBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001009 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1010 .relbit = { BIT_MASK(REL_WHEEL) },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 }, /* A separate scrollwheel */
1012 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001013 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1014 INPUT_DEVICE_ID_MATCH_KEYBIT |
1015 INPUT_DEVICE_ID_MATCH_ABSBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001016 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1017 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1018 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001019 }, /* A tablet like device, at least touch detection,
1020 two absolute axes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001022 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1023 INPUT_DEVICE_ID_MATCH_KEYBIT |
1024 INPUT_DEVICE_ID_MATCH_ABSBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001025 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1026 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1027 BIT_MASK(BTN_TOOL_FINGER) },
1028 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1029 BIT_MASK(ABS_PRESSURE) |
1030 BIT_MASK(ABS_TOOL_WIDTH) },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 }, /* A touchpad */
1032
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -04001033 { }, /* Terminating entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034};
1035
1036MODULE_DEVICE_TABLE(input, mousedev_ids);
1037
1038static struct input_handler mousedev_handler = {
1039 .event = mousedev_event,
1040 .connect = mousedev_connect,
1041 .disconnect = mousedev_disconnect,
1042 .fops = &mousedev_fops,
1043 .minor = MOUSEDEV_MINOR_BASE,
1044 .name = "mousedev",
1045 .id_table = mousedev_ids,
1046};
1047
1048#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1049static struct miscdevice psaux_mouse = {
1050 PSMOUSE_MINOR, "psaux", &mousedev_fops
1051};
1052static int psaux_registered;
1053#endif
1054
1055static int __init mousedev_init(void)
1056{
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001057 int error;
1058
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001059 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1060 if (IS_ERR(mousedev_mix))
1061 return PTR_ERR(mousedev_mix);
1062
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001063 error = input_register_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001064 if (error) {
1065 mousedev_destroy(mousedev_mix);
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001066 return error;
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001067 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
1069#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001070 error = misc_register(&psaux_mouse);
1071 if (error)
1072 printk(KERN_WARNING "mice: could not register psaux device, "
1073 "error: %d\n", error);
1074 else
1075 psaux_registered = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076#endif
1077
1078 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1079
1080 return 0;
1081}
1082
1083static void __exit mousedev_exit(void)
1084{
1085#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1086 if (psaux_registered)
1087 misc_deregister(&psaux_mouse);
1088#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 input_unregister_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001090 mousedev_destroy(mousedev_mix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091}
1092
1093module_init(mousedev_init);
1094module_exit(mousedev_exit);