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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;
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
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400418 input_put_device(mousedev->handle.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 kfree(mousedev);
420}
421
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400422static int mousedev_open_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400424 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400426 retval = mutex_lock_interruptible(&mousedev->mutex);
427 if (retval)
428 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400430 if (mousedev->minor == MOUSEDEV_MIX)
431 mixdev_open_devices();
432 else if (!mousedev->exist)
433 retval = -ENODEV;
Oliver Neukum06445012007-10-12 14:18:40 -0400434 else if (!mousedev->open++) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400435 retval = input_open_device(&mousedev->handle);
Oliver Neukum06445012007-10-12 14:18:40 -0400436 if (retval)
437 mousedev->open--;
438 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400440 mutex_unlock(&mousedev->mutex);
441 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442}
443
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400444static void mousedev_close_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400446 mutex_lock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400447
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400448 if (mousedev->minor == MOUSEDEV_MIX)
449 mixdev_close_devices();
450 else if (mousedev->exist && !--mousedev->open)
451 input_close_device(&mousedev->handle);
452
453 mutex_unlock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400454}
455
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400456/*
457 * Open all available devices so they can all be multiplexed in one.
458 * stream. Note that this function is called with mousedev_mix->mutex
459 * held.
460 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400461static void mixdev_open_devices(void)
462{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400464
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400465 if (mousedev_mix->open++)
466 return;
467
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400468 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400469 if (!mousedev->mixdev_open) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400470 if (mousedev_open_device(mousedev))
471 continue;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400472
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400473 mousedev->mixdev_open = 1;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400474 }
475 }
476}
477
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400478/*
479 * Close all devices that were opened as part of multiplexed
480 * device. Note that this function is called with mousedev_mix->mutex
481 * held.
482 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400483static void mixdev_close_devices(void)
484{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400485 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400486
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400487 if (--mousedev_mix->open)
488 return;
489
490 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400491 if (mousedev->mixdev_open) {
492 mousedev->mixdev_open = 0;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400493 mousedev_close_device(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
495 }
496}
497
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400498
499static void mousedev_attach_client(struct mousedev *mousedev,
500 struct mousedev_client *client)
501{
502 spin_lock(&mousedev->client_lock);
503 list_add_tail_rcu(&client->node, &mousedev->client_list);
504 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400505 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400506}
507
508static void mousedev_detach_client(struct mousedev *mousedev,
509 struct mousedev_client *client)
510{
511 spin_lock(&mousedev->client_lock);
512 list_del_rcu(&client->node);
513 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400514 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400515}
516
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400517static int mousedev_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400519 struct mousedev_client *client = file->private_data;
520 struct mousedev *mousedev = client->mousedev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
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
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200548 lock_kernel();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400549 error = mutex_lock_interruptible(&mousedev_table_mutex);
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200550 if (error) {
551 unlock_kernel();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400552 return error;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200553 }
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400554 mousedev = mousedev_table[i];
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400555 if (mousedev)
556 get_device(&mousedev->dev);
557 mutex_unlock(&mousedev_table_mutex);
558
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200559 if (!mousedev) {
560 unlock_kernel();
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400561 return -ENODEV;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200562 }
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400563
564 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400565 if (!client) {
566 error = -ENOMEM;
567 goto err_put_mousedev;
568 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400570 spin_lock_init(&client->packet_lock);
571 client->pos_x = xres / 2;
572 client->pos_y = yres / 2;
573 client->mousedev = mousedev;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400574 mousedev_attach_client(mousedev, client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400576 error = mousedev_open_device(mousedev);
577 if (error)
578 goto err_free_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400580 file->private_data = client;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200581 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 return 0;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400583
584 err_free_client:
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400585 mousedev_detach_client(mousedev, client);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400586 kfree(client);
587 err_put_mousedev:
588 put_device(&mousedev->dev);
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200589 unlock_kernel();
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400590 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591}
592
593static inline int mousedev_limit_delta(int delta, int limit)
594{
595 return delta > limit ? limit : (delta < -limit ? -limit : delta);
596}
597
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400598static void mousedev_packet(struct mousedev_client *client,
599 signed char *ps2_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400601 struct mousedev_motion *p = &client->packets[client->tail];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400603 ps2_data[0] = 0x08 |
604 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
606 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
607 p->dx -= ps2_data[1];
608 p->dy -= ps2_data[2];
609
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400610 switch (client->mode) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400611 case MOUSEDEV_EMUL_EXPS:
612 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
613 p->dz -= ps2_data[3];
614 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
615 client->bufsiz = 4;
616 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400618 case MOUSEDEV_EMUL_IMPS:
619 ps2_data[0] |=
620 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
621 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
622 p->dz -= ps2_data[3];
623 client->bufsiz = 4;
624 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400626 case MOUSEDEV_EMUL_PS2:
627 default:
628 ps2_data[0] |=
629 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
630 p->dz = 0;
631 client->bufsiz = 3;
632 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 }
634
635 if (!p->dx && !p->dy && !p->dz) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400636 if (client->tail == client->head) {
637 client->ready = 0;
638 client->last_buttons = p->buttons;
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700639 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400640 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642}
643
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400644static void mousedev_generate_response(struct mousedev_client *client,
645 int command)
646{
647 client->ps2[0] = 0xfa; /* ACK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400649 switch (command) {
650
651 case 0xeb: /* Poll */
652 mousedev_packet(client, &client->ps2[1]);
653 client->bufsiz++; /* account for leading ACK */
654 break;
655
656 case 0xf2: /* Get ID */
657 switch (client->mode) {
658 case MOUSEDEV_EMUL_PS2:
659 client->ps2[1] = 0;
660 break;
661 case MOUSEDEV_EMUL_IMPS:
662 client->ps2[1] = 3;
663 break;
664 case MOUSEDEV_EMUL_EXPS:
665 client->ps2[1] = 4;
666 break;
667 }
668 client->bufsiz = 2;
669 break;
670
671 case 0xe9: /* Get info */
672 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
673 client->bufsiz = 4;
674 break;
675
676 case 0xff: /* Reset */
677 client->impsseq = client->imexseq = 0;
678 client->mode = MOUSEDEV_EMUL_PS2;
679 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
680 client->bufsiz = 3;
681 break;
682
683 default:
684 client->bufsiz = 1;
685 break;
686 }
687 client->buffer = client->bufsiz;
688}
689
690static ssize_t mousedev_write(struct file *file, const char __user *buffer,
691 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400693 struct mousedev_client *client = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 unsigned char c;
695 unsigned int i;
696
697 for (i = 0; i < count; i++) {
698
699 if (get_user(c, buffer + i))
700 return -EFAULT;
701
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400702 spin_lock_irq(&client->packet_lock);
703
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400704 if (c == mousedev_imex_seq[client->imexseq]) {
705 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
706 client->imexseq = 0;
707 client->mode = MOUSEDEV_EMUL_EXPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400709 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400710 client->imexseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400712 if (c == mousedev_imps_seq[client->impsseq]) {
713 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
714 client->impsseq = 0;
715 client->mode = MOUSEDEV_EMUL_IMPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400717 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400718 client->impsseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400720 mousedev_generate_response(client, c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400722 spin_unlock_irq(&client->packet_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 }
724
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400725 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400726 wake_up_interruptible(&client->mousedev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728 return count;
729}
730
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400731static ssize_t mousedev_read(struct file *file, char __user *buffer,
732 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400734 struct mousedev_client *client = file->private_data;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400735 struct mousedev *mousedev = client->mousedev;
736 signed char data[sizeof(client->ps2)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 int retval = 0;
738
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400739 if (!client->ready && !client->buffer && mousedev->exist &&
740 (file->f_flags & O_NONBLOCK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 return -EAGAIN;
742
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400743 retval = wait_event_interruptible(mousedev->wait,
744 !mousedev->exist || client->ready || client->buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 if (retval)
746 return retval;
747
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400748 if (!mousedev->exist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 return -ENODEV;
750
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400751 spin_lock_irq(&client->packet_lock);
752
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400753 if (!client->buffer && client->ready) {
754 mousedev_packet(client, client->ps2);
755 client->buffer = client->bufsiz;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 }
757
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400758 if (count > client->buffer)
759 count = client->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400761 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400762 client->buffer -= count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400764 spin_unlock_irq(&client->packet_lock);
765
766 if (copy_to_user(buffer, data, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 return -EFAULT;
768
769 return count;
770}
771
772/* No kernel lock - fine */
773static unsigned int mousedev_poll(struct file *file, poll_table *wait)
774{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400775 struct mousedev_client *client = file->private_data;
776 struct mousedev *mousedev = client->mousedev;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400777
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400778 poll_wait(file, &mousedev->wait, wait);
779 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
780 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781}
782
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400783static const struct file_operations mousedev_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 .owner = THIS_MODULE,
785 .read = mousedev_read,
786 .write = mousedev_write,
787 .poll = mousedev_poll,
788 .open = mousedev_open,
789 .release = mousedev_release,
790 .fasync = mousedev_fasync,
791};
792
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400793static int mousedev_install_chrdev(struct mousedev *mousedev)
794{
795 mousedev_table[mousedev->minor] = mousedev;
796 return 0;
797}
798
799static void mousedev_remove_chrdev(struct mousedev *mousedev)
800{
801 mutex_lock(&mousedev_table_mutex);
802 mousedev_table[mousedev->minor] = NULL;
803 mutex_unlock(&mousedev_table_mutex);
804}
805
806/*
807 * Mark device non-existent. This disables writes, ioctls and
808 * prevents new users from opening the device. Already posted
809 * blocking reads will stay, however new ones will fail.
810 */
811static void mousedev_mark_dead(struct mousedev *mousedev)
812{
813 mutex_lock(&mousedev->mutex);
814 mousedev->exist = 0;
815 mutex_unlock(&mousedev->mutex);
816}
817
818/*
819 * Wake up users waiting for IO so they can disconnect from
820 * dead device.
821 */
822static void mousedev_hangup(struct mousedev *mousedev)
823{
824 struct mousedev_client *client;
825
826 spin_lock(&mousedev->client_lock);
827 list_for_each_entry(client, &mousedev->client_list, node)
828 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
829 spin_unlock(&mousedev->client_lock);
830
831 wake_up_interruptible(&mousedev->wait);
832}
833
834static void mousedev_cleanup(struct mousedev *mousedev)
835{
836 struct input_handle *handle = &mousedev->handle;
837
838 mousedev_mark_dead(mousedev);
839 mousedev_hangup(mousedev);
840 mousedev_remove_chrdev(mousedev);
841
842 /* mousedev is marked dead so no one else accesses mousedev->open */
843 if (mousedev->open)
844 input_close_device(handle);
845}
846
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400847static struct mousedev *mousedev_create(struct input_dev *dev,
848 struct input_handler *handler,
849 int minor)
850{
851 struct mousedev *mousedev;
852 int error;
853
854 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
855 if (!mousedev) {
856 error = -ENOMEM;
857 goto err_out;
858 }
859
860 INIT_LIST_HEAD(&mousedev->client_list);
861 INIT_LIST_HEAD(&mousedev->mixdev_node);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400862 spin_lock_init(&mousedev->client_lock);
863 mutex_init(&mousedev->mutex);
864 lockdep_set_subclass(&mousedev->mutex,
865 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400866 init_waitqueue_head(&mousedev->wait);
867
868 if (minor == MOUSEDEV_MIX)
869 strlcpy(mousedev->name, "mice", sizeof(mousedev->name));
870 else
871 snprintf(mousedev->name, sizeof(mousedev->name),
872 "mouse%d", minor);
873
874 mousedev->minor = minor;
875 mousedev->exist = 1;
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400876 mousedev->handle.dev = input_get_device(dev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400877 mousedev->handle.name = mousedev->name;
878 mousedev->handle.handler = handler;
879 mousedev->handle.private = mousedev;
880
Kay Sieversa6c24902008-10-30 00:07:50 -0400881 dev_set_name(&mousedev->dev, mousedev->name);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400882 mousedev->dev.class = &input_class;
883 if (dev)
884 mousedev->dev.parent = &dev->dev;
885 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
886 mousedev->dev.release = mousedev_free;
887 device_initialize(&mousedev->dev);
888
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400889 if (minor != MOUSEDEV_MIX) {
890 error = input_register_handle(&mousedev->handle);
891 if (error)
892 goto err_free_mousedev;
893 }
894
895 error = mousedev_install_chrdev(mousedev);
896 if (error)
897 goto err_unregister_handle;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400898
899 error = device_add(&mousedev->dev);
900 if (error)
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400901 goto err_cleanup_mousedev;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400902
903 return mousedev;
904
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400905 err_cleanup_mousedev:
906 mousedev_cleanup(mousedev);
907 err_unregister_handle:
908 if (minor != MOUSEDEV_MIX)
909 input_unregister_handle(&mousedev->handle);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400910 err_free_mousedev:
911 put_device(&mousedev->dev);
912 err_out:
913 return ERR_PTR(error);
914}
915
916static void mousedev_destroy(struct mousedev *mousedev)
917{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400918 device_del(&mousedev->dev);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400919 mousedev_cleanup(mousedev);
920 if (mousedev->minor != MOUSEDEV_MIX)
921 input_unregister_handle(&mousedev->handle);
922 put_device(&mousedev->dev);
923}
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400924
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400925static int mixdev_add_device(struct mousedev *mousedev)
926{
927 int retval;
928
929 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
930 if (retval)
931 return retval;
932
933 if (mousedev_mix->open) {
934 retval = mousedev_open_device(mousedev);
935 if (retval)
936 goto out;
937
938 mousedev->mixdev_open = 1;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400939 }
940
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400941 get_device(&mousedev->dev);
942 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
943
944 out:
945 mutex_unlock(&mousedev_mix->mutex);
946 return retval;
947}
948
949static void mixdev_remove_device(struct mousedev *mousedev)
950{
951 mutex_lock(&mousedev_mix->mutex);
952
953 if (mousedev->mixdev_open) {
954 mousedev->mixdev_open = 0;
955 mousedev_close_device(mousedev);
956 }
957
958 list_del_init(&mousedev->mixdev_node);
959 mutex_unlock(&mousedev_mix->mutex);
960
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400961 put_device(&mousedev->dev);
962}
963
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400964static int mousedev_connect(struct input_handler *handler,
965 struct input_dev *dev,
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400966 const struct input_device_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967{
968 struct mousedev *mousedev;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400969 int minor;
970 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400972 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
973 if (!mousedev_table[minor])
974 break;
975
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 if (minor == MOUSEDEV_MINORS) {
977 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400978 return -ENFILE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 }
980
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400981 mousedev = mousedev_create(dev, handler, minor);
982 if (IS_ERR(mousedev))
983 return PTR_ERR(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400985 error = mixdev_add_device(mousedev);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400986 if (error) {
987 mousedev_destroy(mousedev);
988 return error;
989 }
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400990
991 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992}
993
994static void mousedev_disconnect(struct input_handle *handle)
995{
996 struct mousedev *mousedev = handle->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400998 mixdev_remove_device(mousedev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400999 mousedev_destroy(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000}
1001
Dmitry Torokhov66e66112006-09-14 01:31:59 -04001002static const struct input_device_id mousedev_ids[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001004 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1005 INPUT_DEVICE_ID_MATCH_KEYBIT |
1006 INPUT_DEVICE_ID_MATCH_RELBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001007 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1008 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1009 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001010 }, /* A mouse like device, at least one button,
1011 two relative axes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001013 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1014 INPUT_DEVICE_ID_MATCH_RELBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001015 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1016 .relbit = { BIT_MASK(REL_WHEEL) },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 }, /* A separate scrollwheel */
1018 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001019 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1020 INPUT_DEVICE_ID_MATCH_KEYBIT |
1021 INPUT_DEVICE_ID_MATCH_ABSBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001022 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1023 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1024 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001025 }, /* A tablet like device, at least touch detection,
1026 two absolute axes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001028 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1029 INPUT_DEVICE_ID_MATCH_KEYBIT |
1030 INPUT_DEVICE_ID_MATCH_ABSBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001031 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1032 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1033 BIT_MASK(BTN_TOOL_FINGER) },
1034 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1035 BIT_MASK(ABS_PRESSURE) |
1036 BIT_MASK(ABS_TOOL_WIDTH) },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 }, /* A touchpad */
Micah Parrish6724f932008-01-17 12:01:04 -05001038 {
1039 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1040 INPUT_DEVICE_ID_MATCH_KEYBIT |
1041 INPUT_DEVICE_ID_MATCH_ABSBIT,
Dmitry Torokhovd182c102008-01-30 16:33:40 -05001042 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
Micah Parrish6724f932008-01-17 12:01:04 -05001043 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1044 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1045 }, /* Mouse-like device with absolute X and Y but ordinary
1046 clicks, like hp ILO2 High Performance mouse */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -04001048 { }, /* Terminating entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049};
1050
1051MODULE_DEVICE_TABLE(input, mousedev_ids);
1052
1053static struct input_handler mousedev_handler = {
1054 .event = mousedev_event,
1055 .connect = mousedev_connect,
1056 .disconnect = mousedev_disconnect,
1057 .fops = &mousedev_fops,
1058 .minor = MOUSEDEV_MINOR_BASE,
1059 .name = "mousedev",
1060 .id_table = mousedev_ids,
1061};
1062
1063#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1064static struct miscdevice psaux_mouse = {
1065 PSMOUSE_MINOR, "psaux", &mousedev_fops
1066};
1067static int psaux_registered;
1068#endif
1069
1070static int __init mousedev_init(void)
1071{
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001072 int error;
1073
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001074 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1075 if (IS_ERR(mousedev_mix))
1076 return PTR_ERR(mousedev_mix);
1077
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001078 error = input_register_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001079 if (error) {
1080 mousedev_destroy(mousedev_mix);
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001081 return error;
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001082 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
1084#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001085 error = misc_register(&psaux_mouse);
1086 if (error)
1087 printk(KERN_WARNING "mice: could not register psaux device, "
1088 "error: %d\n", error);
1089 else
1090 psaux_registered = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091#endif
1092
1093 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1094
1095 return 0;
1096}
1097
1098static void __exit mousedev_exit(void)
1099{
1100#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1101 if (psaux_registered)
1102 misc_deregister(&psaux_mouse);
1103#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 input_unregister_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001105 mousedev_destroy(mousedev_mix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106}
1107
1108module_init(mousedev_init);
1109module_exit(mousedev_exit);