blob: 966b8868f7924f6f73c276411cded8f29b155714 [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>
Arnd Bergmannf9c81542008-05-20 19:16:20 +020017#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/poll.h>
19#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#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;
Dmitry Torokhov464b2412007-08-30 00:22:24 -040063 struct input_handle handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 wait_queue_head_t wait;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040065 struct list_head client_list;
Dmitry Torokhov464b2412007-08-30 00:22:24 -040066 spinlock_t client_lock; /* protects client_list */
67 struct mutex mutex;
Dmitry Torokhov9657d752007-06-14 23:32:24 -040068 struct device dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Dmitry Torokhovd542ed82007-04-12 01:30:15 -040070 struct list_head mixdev_node;
71 int mixdev_open;
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 struct mousedev_hw_data packet;
74 unsigned int pkt_count;
75 int old_x[4], old_y[4];
76 int frac_dx, frac_dy;
77 unsigned long touch;
78};
79
80enum mousedev_emul {
81 MOUSEDEV_EMUL_PS2,
82 MOUSEDEV_EMUL_IMPS,
83 MOUSEDEV_EMUL_EXPS
84};
85
86struct mousedev_motion {
87 int dx, dy, dz;
88 unsigned long buttons;
89};
90
91#define PACKET_QUEUE_LEN 16
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040092struct mousedev_client {
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 struct fasync_struct *fasync;
94 struct mousedev *mousedev;
95 struct list_head node;
96
97 struct mousedev_motion packets[PACKET_QUEUE_LEN];
98 unsigned int head, tail;
99 spinlock_t packet_lock;
100 int pos_x, pos_y;
101
102 signed char ps2[6];
103 unsigned char ready, buffer, bufsiz;
104 unsigned char imexseq, impsseq;
105 enum mousedev_emul mode;
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700106 unsigned long last_buttons;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108
109#define MOUSEDEV_SEQ_LEN 6
110
111static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
112static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
113
114static struct input_handler mousedev_handler;
115
116static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400117static DEFINE_MUTEX(mousedev_table_mutex);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400118static struct mousedev *mousedev_mix;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400119static LIST_HEAD(mousedev_mix_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400121static void mixdev_open_devices(void);
122static void mixdev_close_devices(void);
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
125#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
126
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400127static void mousedev_touchpad_event(struct input_dev *dev,
128 struct mousedev *mousedev,
129 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
131 int size, tmp;
132 enum { FRACTION_DENOM = 128 };
133
Dmitry Torokhov0d9d93c2007-04-12 01:31:55 -0400134 switch (code) {
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400135
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400136 case ABS_X:
137 fx(0) = value;
138 if (mousedev->touch && mousedev->pkt_count >= 2) {
139 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
140 if (size == 0)
141 size = 256 * 2;
142 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
143 tmp += mousedev->frac_dx;
144 mousedev->packet.dx = tmp / FRACTION_DENOM;
145 mousedev->frac_dx =
146 tmp - mousedev->packet.dx * FRACTION_DENOM;
147 }
148 break;
149
150 case ABS_Y:
151 fy(0) = value;
152 if (mousedev->touch && mousedev->pkt_count >= 2) {
153 /* use X size to keep the same scale */
154 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
155 if (size == 0)
156 size = 256 * 2;
157 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
158 tmp += mousedev->frac_dy;
159 mousedev->packet.dy = tmp / FRACTION_DENOM;
160 mousedev->frac_dy = tmp -
161 mousedev->packet.dy * FRACTION_DENOM;
162 }
163 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165}
166
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400167static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
168 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
170 int size;
171
172 switch (code) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400174 case ABS_X:
175 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
176 if (size == 0)
177 size = xres ? : 1;
178 if (value > dev->absmax[ABS_X])
179 value = dev->absmax[ABS_X];
180 if (value < dev->absmin[ABS_X])
181 value = dev->absmin[ABS_X];
182 mousedev->packet.x =
183 ((value - dev->absmin[ABS_X]) * xres) / size;
184 mousedev->packet.abs_event = 1;
185 break;
186
187 case ABS_Y:
188 size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
189 if (size == 0)
190 size = yres ? : 1;
191 if (value > dev->absmax[ABS_Y])
192 value = dev->absmax[ABS_Y];
193 if (value < dev->absmin[ABS_Y])
194 value = dev->absmin[ABS_Y];
195 mousedev->packet.y = yres -
196 ((value - dev->absmin[ABS_Y]) * yres) / size;
197 mousedev->packet.abs_event = 1;
198 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 }
200}
201
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400202static void mousedev_rel_event(struct mousedev *mousedev,
203 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
205 switch (code) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400206 case REL_X:
207 mousedev->packet.dx += value;
208 break;
209
210 case REL_Y:
211 mousedev->packet.dy -= value;
212 break;
213
214 case REL_WHEEL:
215 mousedev->packet.dz -= value;
216 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 }
218}
219
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400220static void mousedev_key_event(struct mousedev *mousedev,
221 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
223 int index;
224
225 switch (code) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400226
227 case BTN_TOUCH:
228 case BTN_0:
229 case BTN_LEFT: index = 0; break;
230
231 case BTN_STYLUS:
232 case BTN_1:
233 case BTN_RIGHT: index = 1; break;
234
235 case BTN_2:
236 case BTN_FORWARD:
237 case BTN_STYLUS2:
238 case BTN_MIDDLE: index = 2; break;
239
240 case BTN_3:
241 case BTN_BACK:
242 case BTN_SIDE: index = 3; break;
243
244 case BTN_4:
245 case BTN_EXTRA: index = 4; break;
246
247 default: return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 }
249
250 if (value) {
251 set_bit(index, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400252 set_bit(index, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 } else {
254 clear_bit(index, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400255 clear_bit(index, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
257}
258
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400259static void mousedev_notify_readers(struct mousedev *mousedev,
260 struct mousedev_hw_data *packet)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400262 struct mousedev_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 struct mousedev_motion *p;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400264 unsigned int new_head;
Dmitry Torokhov81211522005-06-01 02:39:36 -0500265 int wake_readers = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400267 rcu_read_lock();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400268 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
269
270 /* Just acquire the lock, interrupts already disabled */
271 spin_lock(&client->packet_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400273 p = &client->packets[client->head];
274 if (client->ready && p->buttons != mousedev->packet.buttons) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400275 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400276 if (new_head != client->tail) {
277 p = &client->packets[client->head = new_head];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 memset(p, 0, sizeof(struct mousedev_motion));
279 }
280 }
281
282 if (packet->abs_event) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400283 p->dx += packet->x - client->pos_x;
284 p->dy += packet->y - client->pos_y;
285 client->pos_x = packet->x;
286 client->pos_y = packet->y;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 }
288
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400289 client->pos_x += packet->dx;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400290 client->pos_x = client->pos_x < 0 ?
291 0 : (client->pos_x >= xres ? xres : client->pos_x);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400292 client->pos_y += packet->dy;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400293 client->pos_y = client->pos_y < 0 ?
294 0 : (client->pos_y >= yres ? yres : client->pos_y);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 p->dx += packet->dx;
297 p->dy += packet->dy;
298 p->dz += packet->dz;
299 p->buttons = mousedev->packet.buttons;
300
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400301 if (p->dx || p->dy || p->dz ||
302 p->buttons != client->last_buttons)
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400303 client->ready = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400305 spin_unlock(&client->packet_lock);
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700306
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400307 if (client->ready) {
308 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhov81211522005-06-01 02:39:36 -0500309 wake_readers = 1;
310 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 }
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400312 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Dmitry Torokhov81211522005-06-01 02:39:36 -0500314 if (wake_readers)
315 wake_up_interruptible(&mousedev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316}
317
318static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
319{
320 if (!value) {
321 if (mousedev->touch &&
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400322 time_before(jiffies,
323 mousedev->touch + msecs_to_jiffies(tap_time))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 /*
325 * Toggle left button to emulate tap.
326 * We rely on the fact that mousedev_mix always has 0
327 * motion packet so we won't mess current position.
328 */
329 set_bit(0, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400330 set_bit(0, &mousedev_mix->packet.buttons);
331 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400332 mousedev_notify_readers(mousedev_mix,
333 &mousedev_mix->packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 clear_bit(0, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400335 clear_bit(0, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
337 mousedev->touch = mousedev->pkt_count = 0;
338 mousedev->frac_dx = 0;
339 mousedev->frac_dy = 0;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400340
341 } else if (!mousedev->touch)
342 mousedev->touch = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343}
344
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400345static void mousedev_event(struct input_handle *handle,
346 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
348 struct mousedev *mousedev = handle->private;
349
350 switch (type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400352 case EV_ABS:
353 /* Ignore joysticks */
354 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
355 return;
356
357 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
358 mousedev_touchpad_event(handle->dev,
359 mousedev, code, value);
360 else
361 mousedev_abs_event(handle->dev, mousedev, code, value);
362
363 break;
364
365 case EV_REL:
366 mousedev_rel_event(mousedev, code, value);
367 break;
368
369 case EV_KEY:
370 if (value != 2) {
371 if (code == BTN_TOUCH &&
372 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
373 mousedev_touchpad_touch(mousedev, value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 else
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400375 mousedev_key_event(mousedev, code, value);
376 }
377 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400379 case EV_SYN:
380 if (code == SYN_REPORT) {
381 if (mousedev->touch) {
382 mousedev->pkt_count++;
383 /*
384 * Input system eats duplicate events,
385 * but we need all of them to do correct
386 * averaging so apply present one forward
387 */
388 fx(0) = fx(1);
389 fy(0) = fy(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400392 mousedev_notify_readers(mousedev, &mousedev->packet);
393 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400395 mousedev->packet.dx = mousedev->packet.dy =
396 mousedev->packet.dz = 0;
397 mousedev->packet.abs_event = 0;
398 }
399 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401}
402
403static int mousedev_fasync(int fd, struct file *file, int on)
404{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400405 struct mousedev_client *client = file->private_data;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400406
Jonathan Corbet60aa4922009-02-01 14:52:56 -0700407 return fasync_helper(fd, file, on, &client->fasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408}
409
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400410static void mousedev_free(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400412 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
413
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400414 input_put_device(mousedev->handle.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 kfree(mousedev);
416}
417
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400418static int mousedev_open_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400420 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400422 retval = mutex_lock_interruptible(&mousedev->mutex);
423 if (retval)
424 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400426 if (mousedev->minor == MOUSEDEV_MIX)
427 mixdev_open_devices();
428 else if (!mousedev->exist)
429 retval = -ENODEV;
Oliver Neukum06445012007-10-12 14:18:40 -0400430 else if (!mousedev->open++) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400431 retval = input_open_device(&mousedev->handle);
Oliver Neukum06445012007-10-12 14:18:40 -0400432 if (retval)
433 mousedev->open--;
434 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400436 mutex_unlock(&mousedev->mutex);
437 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
439
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400440static void mousedev_close_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400442 mutex_lock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400443
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400444 if (mousedev->minor == MOUSEDEV_MIX)
445 mixdev_close_devices();
446 else if (mousedev->exist && !--mousedev->open)
447 input_close_device(&mousedev->handle);
448
449 mutex_unlock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400450}
451
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400452/*
453 * Open all available devices so they can all be multiplexed in one.
454 * stream. Note that this function is called with mousedev_mix->mutex
455 * held.
456 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400457static void mixdev_open_devices(void)
458{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400460
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400461 if (mousedev_mix->open++)
462 return;
463
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400464 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400465 if (!mousedev->mixdev_open) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400466 if (mousedev_open_device(mousedev))
467 continue;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400468
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400469 mousedev->mixdev_open = 1;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400470 }
471 }
472}
473
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400474/*
475 * Close all devices that were opened as part of multiplexed
476 * device. Note that this function is called with mousedev_mix->mutex
477 * held.
478 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400479static void mixdev_close_devices(void)
480{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400481 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400482
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400483 if (--mousedev_mix->open)
484 return;
485
486 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400487 if (mousedev->mixdev_open) {
488 mousedev->mixdev_open = 0;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400489 mousedev_close_device(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 }
491 }
492}
493
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400494
495static void mousedev_attach_client(struct mousedev *mousedev,
496 struct mousedev_client *client)
497{
498 spin_lock(&mousedev->client_lock);
499 list_add_tail_rcu(&client->node, &mousedev->client_list);
500 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400501 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400502}
503
504static void mousedev_detach_client(struct mousedev *mousedev,
505 struct mousedev_client *client)
506{
507 spin_lock(&mousedev->client_lock);
508 list_del_rcu(&client->node);
509 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400510 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400511}
512
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400513static int mousedev_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400515 struct mousedev_client *client = file->private_data;
516 struct mousedev *mousedev = client->mousedev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400518 mousedev_detach_client(mousedev, client);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400519 kfree(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400521 mousedev_close_device(mousedev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400522 put_device(&mousedev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 return 0;
525}
526
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400527static int mousedev_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400529 struct mousedev_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400531 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 int i;
533
534#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
535 if (imajor(inode) == MISC_MAJOR)
536 i = MOUSEDEV_MIX;
537 else
538#endif
539 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
540
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400541 if (i >= MOUSEDEV_MINORS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 return -ENODEV;
543
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200544 lock_kernel();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400545 error = mutex_lock_interruptible(&mousedev_table_mutex);
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200546 if (error) {
547 unlock_kernel();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400548 return error;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200549 }
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400550 mousedev = mousedev_table[i];
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400551 if (mousedev)
552 get_device(&mousedev->dev);
553 mutex_unlock(&mousedev_table_mutex);
554
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200555 if (!mousedev) {
556 unlock_kernel();
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400557 return -ENODEV;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200558 }
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400559
560 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400561 if (!client) {
562 error = -ENOMEM;
563 goto err_put_mousedev;
564 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400566 spin_lock_init(&client->packet_lock);
567 client->pos_x = xres / 2;
568 client->pos_y = yres / 2;
569 client->mousedev = mousedev;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400570 mousedev_attach_client(mousedev, client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400572 error = mousedev_open_device(mousedev);
573 if (error)
574 goto err_free_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400576 file->private_data = client;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200577 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 return 0;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400579
580 err_free_client:
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400581 mousedev_detach_client(mousedev, client);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400582 kfree(client);
583 err_put_mousedev:
584 put_device(&mousedev->dev);
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200585 unlock_kernel();
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400586 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587}
588
589static inline int mousedev_limit_delta(int delta, int limit)
590{
591 return delta > limit ? limit : (delta < -limit ? -limit : delta);
592}
593
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400594static void mousedev_packet(struct mousedev_client *client,
595 signed char *ps2_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400597 struct mousedev_motion *p = &client->packets[client->tail];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400599 ps2_data[0] = 0x08 |
600 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
602 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
603 p->dx -= ps2_data[1];
604 p->dy -= ps2_data[2];
605
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400606 switch (client->mode) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400607 case MOUSEDEV_EMUL_EXPS:
608 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
609 p->dz -= ps2_data[3];
610 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
611 client->bufsiz = 4;
612 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400614 case MOUSEDEV_EMUL_IMPS:
615 ps2_data[0] |=
616 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
617 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
618 p->dz -= ps2_data[3];
619 client->bufsiz = 4;
620 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400622 case MOUSEDEV_EMUL_PS2:
623 default:
624 ps2_data[0] |=
625 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
626 p->dz = 0;
627 client->bufsiz = 3;
628 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 }
630
631 if (!p->dx && !p->dy && !p->dz) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400632 if (client->tail == client->head) {
633 client->ready = 0;
634 client->last_buttons = p->buttons;
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700635 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400636 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400640static void mousedev_generate_response(struct mousedev_client *client,
641 int command)
642{
643 client->ps2[0] = 0xfa; /* ACK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400645 switch (command) {
646
647 case 0xeb: /* Poll */
648 mousedev_packet(client, &client->ps2[1]);
649 client->bufsiz++; /* account for leading ACK */
650 break;
651
652 case 0xf2: /* Get ID */
653 switch (client->mode) {
654 case MOUSEDEV_EMUL_PS2:
655 client->ps2[1] = 0;
656 break;
657 case MOUSEDEV_EMUL_IMPS:
658 client->ps2[1] = 3;
659 break;
660 case MOUSEDEV_EMUL_EXPS:
661 client->ps2[1] = 4;
662 break;
663 }
664 client->bufsiz = 2;
665 break;
666
667 case 0xe9: /* Get info */
668 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
669 client->bufsiz = 4;
670 break;
671
672 case 0xff: /* Reset */
673 client->impsseq = client->imexseq = 0;
674 client->mode = MOUSEDEV_EMUL_PS2;
675 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
676 client->bufsiz = 3;
677 break;
678
679 default:
680 client->bufsiz = 1;
681 break;
682 }
683 client->buffer = client->bufsiz;
684}
685
686static ssize_t mousedev_write(struct file *file, const char __user *buffer,
687 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400689 struct mousedev_client *client = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 unsigned char c;
691 unsigned int i;
692
693 for (i = 0; i < count; i++) {
694
695 if (get_user(c, buffer + i))
696 return -EFAULT;
697
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400698 spin_lock_irq(&client->packet_lock);
699
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400700 if (c == mousedev_imex_seq[client->imexseq]) {
701 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
702 client->imexseq = 0;
703 client->mode = MOUSEDEV_EMUL_EXPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400705 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400706 client->imexseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400708 if (c == mousedev_imps_seq[client->impsseq]) {
709 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
710 client->impsseq = 0;
711 client->mode = MOUSEDEV_EMUL_IMPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400713 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400714 client->impsseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400716 mousedev_generate_response(client, c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400718 spin_unlock_irq(&client->packet_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 }
720
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400721 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400722 wake_up_interruptible(&client->mousedev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 return count;
725}
726
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400727static ssize_t mousedev_read(struct file *file, char __user *buffer,
728 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400730 struct mousedev_client *client = file->private_data;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400731 struct mousedev *mousedev = client->mousedev;
732 signed char data[sizeof(client->ps2)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 int retval = 0;
734
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400735 if (!client->ready && !client->buffer && mousedev->exist &&
736 (file->f_flags & O_NONBLOCK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 return -EAGAIN;
738
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400739 retval = wait_event_interruptible(mousedev->wait,
740 !mousedev->exist || client->ready || client->buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 if (retval)
742 return retval;
743
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400744 if (!mousedev->exist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 return -ENODEV;
746
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400747 spin_lock_irq(&client->packet_lock);
748
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400749 if (!client->buffer && client->ready) {
750 mousedev_packet(client, client->ps2);
751 client->buffer = client->bufsiz;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
753
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400754 if (count > client->buffer)
755 count = client->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400757 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400758 client->buffer -= count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400760 spin_unlock_irq(&client->packet_lock);
761
762 if (copy_to_user(buffer, data, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 return -EFAULT;
764
765 return count;
766}
767
768/* No kernel lock - fine */
769static unsigned int mousedev_poll(struct file *file, poll_table *wait)
770{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400771 struct mousedev_client *client = file->private_data;
772 struct mousedev *mousedev = client->mousedev;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400773
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400774 poll_wait(file, &mousedev->wait, wait);
775 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
776 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777}
778
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400779static const struct file_operations mousedev_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 .owner = THIS_MODULE,
781 .read = mousedev_read,
782 .write = mousedev_write,
783 .poll = mousedev_poll,
784 .open = mousedev_open,
785 .release = mousedev_release,
786 .fasync = mousedev_fasync,
787};
788
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400789static int mousedev_install_chrdev(struct mousedev *mousedev)
790{
791 mousedev_table[mousedev->minor] = mousedev;
792 return 0;
793}
794
795static void mousedev_remove_chrdev(struct mousedev *mousedev)
796{
797 mutex_lock(&mousedev_table_mutex);
798 mousedev_table[mousedev->minor] = NULL;
799 mutex_unlock(&mousedev_table_mutex);
800}
801
802/*
803 * Mark device non-existent. This disables writes, ioctls and
804 * prevents new users from opening the device. Already posted
805 * blocking reads will stay, however new ones will fail.
806 */
807static void mousedev_mark_dead(struct mousedev *mousedev)
808{
809 mutex_lock(&mousedev->mutex);
810 mousedev->exist = 0;
811 mutex_unlock(&mousedev->mutex);
812}
813
814/*
815 * Wake up users waiting for IO so they can disconnect from
816 * dead device.
817 */
818static void mousedev_hangup(struct mousedev *mousedev)
819{
820 struct mousedev_client *client;
821
822 spin_lock(&mousedev->client_lock);
823 list_for_each_entry(client, &mousedev->client_list, node)
824 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
825 spin_unlock(&mousedev->client_lock);
826
827 wake_up_interruptible(&mousedev->wait);
828}
829
830static void mousedev_cleanup(struct mousedev *mousedev)
831{
832 struct input_handle *handle = &mousedev->handle;
833
834 mousedev_mark_dead(mousedev);
835 mousedev_hangup(mousedev);
836 mousedev_remove_chrdev(mousedev);
837
838 /* mousedev is marked dead so no one else accesses mousedev->open */
839 if (mousedev->open)
840 input_close_device(handle);
841}
842
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400843static struct mousedev *mousedev_create(struct input_dev *dev,
844 struct input_handler *handler,
845 int minor)
846{
847 struct mousedev *mousedev;
848 int error;
849
850 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
851 if (!mousedev) {
852 error = -ENOMEM;
853 goto err_out;
854 }
855
856 INIT_LIST_HEAD(&mousedev->client_list);
857 INIT_LIST_HEAD(&mousedev->mixdev_node);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400858 spin_lock_init(&mousedev->client_lock);
859 mutex_init(&mousedev->mutex);
860 lockdep_set_subclass(&mousedev->mutex,
861 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400862 init_waitqueue_head(&mousedev->wait);
863
864 if (minor == MOUSEDEV_MIX)
Thadeu Lima de Souza Cascardo3d5cb602009-05-09 16:08:04 -0700865 dev_set_name(&mousedev->dev, "mice");
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400866 else
Thadeu Lima de Souza Cascardo3d5cb602009-05-09 16:08:04 -0700867 dev_set_name(&mousedev->dev, "mouse%d", minor);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400868
869 mousedev->minor = minor;
870 mousedev->exist = 1;
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400871 mousedev->handle.dev = input_get_device(dev);
Thadeu Lima de Souza Cascardo3d5cb602009-05-09 16:08:04 -0700872 mousedev->handle.name = dev_name(&mousedev->dev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400873 mousedev->handle.handler = handler;
874 mousedev->handle.private = mousedev;
875
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400876 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 */
Micah Parrish6724f932008-01-17 12:01:04 -05001032 {
1033 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1034 INPUT_DEVICE_ID_MATCH_KEYBIT |
1035 INPUT_DEVICE_ID_MATCH_ABSBIT,
Dmitry Torokhovd182c102008-01-30 16:33:40 -05001036 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
Micah Parrish6724f932008-01-17 12:01:04 -05001037 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1038 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1039 }, /* Mouse-like device with absolute X and Y but ordinary
1040 clicks, like hp ILO2 High Performance mouse */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -04001042 { }, /* Terminating entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043};
1044
1045MODULE_DEVICE_TABLE(input, mousedev_ids);
1046
1047static struct input_handler mousedev_handler = {
1048 .event = mousedev_event,
1049 .connect = mousedev_connect,
1050 .disconnect = mousedev_disconnect,
1051 .fops = &mousedev_fops,
1052 .minor = MOUSEDEV_MINOR_BASE,
1053 .name = "mousedev",
1054 .id_table = mousedev_ids,
1055};
1056
1057#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1058static struct miscdevice psaux_mouse = {
1059 PSMOUSE_MINOR, "psaux", &mousedev_fops
1060};
1061static int psaux_registered;
1062#endif
1063
1064static int __init mousedev_init(void)
1065{
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001066 int error;
1067
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001068 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1069 if (IS_ERR(mousedev_mix))
1070 return PTR_ERR(mousedev_mix);
1071
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001072 error = input_register_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001073 if (error) {
1074 mousedev_destroy(mousedev_mix);
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001075 return error;
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001076 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
1078#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001079 error = misc_register(&psaux_mouse);
1080 if (error)
1081 printk(KERN_WARNING "mice: could not register psaux device, "
1082 "error: %d\n", error);
1083 else
1084 psaux_registered = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085#endif
1086
1087 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1088
1089 return 0;
1090}
1091
1092static void __exit mousedev_exit(void)
1093{
1094#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1095 if (psaux_registered)
1096 misc_deregister(&psaux_mouse);
1097#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 input_unregister_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001099 mousedev_destroy(mousedev_mix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100}
1101
1102module_init(mousedev_init);
1103module_exit(mousedev_exit);