blob: 17fd6d46d082eafe8e124a6f78de65cc53e17c73 [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;
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{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400406 struct mousedev_client *client = file->private_data;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400407
Jonathan Corbet60aa4922009-02-01 14:52:56 -0700408 return fasync_helper(fd, file, on, &client->fasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400411static void mousedev_free(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400413 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
414
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400415 input_put_device(mousedev->handle.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 kfree(mousedev);
417}
418
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400419static int mousedev_open_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400421 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400423 retval = mutex_lock_interruptible(&mousedev->mutex);
424 if (retval)
425 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400427 if (mousedev->minor == MOUSEDEV_MIX)
428 mixdev_open_devices();
429 else if (!mousedev->exist)
430 retval = -ENODEV;
Oliver Neukum06445012007-10-12 14:18:40 -0400431 else if (!mousedev->open++) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400432 retval = input_open_device(&mousedev->handle);
Oliver Neukum06445012007-10-12 14:18:40 -0400433 if (retval)
434 mousedev->open--;
435 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400437 mutex_unlock(&mousedev->mutex);
438 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439}
440
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400441static void mousedev_close_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400443 mutex_lock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400444
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400445 if (mousedev->minor == MOUSEDEV_MIX)
446 mixdev_close_devices();
447 else if (mousedev->exist && !--mousedev->open)
448 input_close_device(&mousedev->handle);
449
450 mutex_unlock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400451}
452
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400453/*
454 * Open all available devices so they can all be multiplexed in one.
455 * stream. Note that this function is called with mousedev_mix->mutex
456 * held.
457 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400458static void mixdev_open_devices(void)
459{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400461
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400462 if (mousedev_mix->open++)
463 return;
464
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400465 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400466 if (!mousedev->mixdev_open) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400467 if (mousedev_open_device(mousedev))
468 continue;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400469
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400470 mousedev->mixdev_open = 1;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400471 }
472 }
473}
474
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400475/*
476 * Close all devices that were opened as part of multiplexed
477 * device. Note that this function is called with mousedev_mix->mutex
478 * held.
479 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400480static void mixdev_close_devices(void)
481{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400482 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400483
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400484 if (--mousedev_mix->open)
485 return;
486
487 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400488 if (mousedev->mixdev_open) {
489 mousedev->mixdev_open = 0;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400490 mousedev_close_device(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
492 }
493}
494
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400495
496static void mousedev_attach_client(struct mousedev *mousedev,
497 struct mousedev_client *client)
498{
499 spin_lock(&mousedev->client_lock);
500 list_add_tail_rcu(&client->node, &mousedev->client_list);
501 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400502 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400503}
504
505static void mousedev_detach_client(struct mousedev *mousedev,
506 struct mousedev_client *client)
507{
508 spin_lock(&mousedev->client_lock);
509 list_del_rcu(&client->node);
510 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400511 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400512}
513
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400514static int mousedev_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400516 struct mousedev_client *client = file->private_data;
517 struct mousedev *mousedev = client->mousedev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400519 mousedev_detach_client(mousedev, client);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400520 kfree(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400522 mousedev_close_device(mousedev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400523 put_device(&mousedev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 return 0;
526}
527
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400528static int mousedev_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400530 struct mousedev_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400532 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 int i;
534
535#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
536 if (imajor(inode) == MISC_MAJOR)
537 i = MOUSEDEV_MIX;
538 else
539#endif
540 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
541
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400542 if (i >= MOUSEDEV_MINORS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 return -ENODEV;
544
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200545 lock_kernel();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400546 error = mutex_lock_interruptible(&mousedev_table_mutex);
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200547 if (error) {
548 unlock_kernel();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400549 return error;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200550 }
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
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200556 if (!mousedev) {
557 unlock_kernel();
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400558 return -ENODEV;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200559 }
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400560
561 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400562 if (!client) {
563 error = -ENOMEM;
564 goto err_put_mousedev;
565 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400567 spin_lock_init(&client->packet_lock);
568 client->pos_x = xres / 2;
569 client->pos_y = yres / 2;
570 client->mousedev = mousedev;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400571 mousedev_attach_client(mousedev, client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400573 error = mousedev_open_device(mousedev);
574 if (error)
575 goto err_free_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400577 file->private_data = client;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200578 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 return 0;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400580
581 err_free_client:
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400582 mousedev_detach_client(mousedev, client);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400583 kfree(client);
584 err_put_mousedev:
585 put_device(&mousedev->dev);
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200586 unlock_kernel();
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400587 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588}
589
590static inline int mousedev_limit_delta(int delta, int limit)
591{
592 return delta > limit ? limit : (delta < -limit ? -limit : delta);
593}
594
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400595static void mousedev_packet(struct mousedev_client *client,
596 signed char *ps2_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400598 struct mousedev_motion *p = &client->packets[client->tail];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400600 ps2_data[0] = 0x08 |
601 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
603 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
604 p->dx -= ps2_data[1];
605 p->dy -= ps2_data[2];
606
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400607 switch (client->mode) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400608 case MOUSEDEV_EMUL_EXPS:
609 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
610 p->dz -= ps2_data[3];
611 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
612 client->bufsiz = 4;
613 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400615 case MOUSEDEV_EMUL_IMPS:
616 ps2_data[0] |=
617 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
618 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
619 p->dz -= ps2_data[3];
620 client->bufsiz = 4;
621 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400623 case MOUSEDEV_EMUL_PS2:
624 default:
625 ps2_data[0] |=
626 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
627 p->dz = 0;
628 client->bufsiz = 3;
629 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 }
631
632 if (!p->dx && !p->dy && !p->dz) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400633 if (client->tail == client->head) {
634 client->ready = 0;
635 client->last_buttons = p->buttons;
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700636 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400637 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639}
640
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400641static void mousedev_generate_response(struct mousedev_client *client,
642 int command)
643{
644 client->ps2[0] = 0xfa; /* ACK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400646 switch (command) {
647
648 case 0xeb: /* Poll */
649 mousedev_packet(client, &client->ps2[1]);
650 client->bufsiz++; /* account for leading ACK */
651 break;
652
653 case 0xf2: /* Get ID */
654 switch (client->mode) {
655 case MOUSEDEV_EMUL_PS2:
656 client->ps2[1] = 0;
657 break;
658 case MOUSEDEV_EMUL_IMPS:
659 client->ps2[1] = 3;
660 break;
661 case MOUSEDEV_EMUL_EXPS:
662 client->ps2[1] = 4;
663 break;
664 }
665 client->bufsiz = 2;
666 break;
667
668 case 0xe9: /* Get info */
669 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
670 client->bufsiz = 4;
671 break;
672
673 case 0xff: /* Reset */
674 client->impsseq = client->imexseq = 0;
675 client->mode = MOUSEDEV_EMUL_PS2;
676 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
677 client->bufsiz = 3;
678 break;
679
680 default:
681 client->bufsiz = 1;
682 break;
683 }
684 client->buffer = client->bufsiz;
685}
686
687static ssize_t mousedev_write(struct file *file, const char __user *buffer,
688 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400690 struct mousedev_client *client = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 unsigned char c;
692 unsigned int i;
693
694 for (i = 0; i < count; i++) {
695
696 if (get_user(c, buffer + i))
697 return -EFAULT;
698
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400699 spin_lock_irq(&client->packet_lock);
700
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400701 if (c == mousedev_imex_seq[client->imexseq]) {
702 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
703 client->imexseq = 0;
704 client->mode = MOUSEDEV_EMUL_EXPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400706 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400707 client->imexseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400709 if (c == mousedev_imps_seq[client->impsseq]) {
710 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
711 client->impsseq = 0;
712 client->mode = MOUSEDEV_EMUL_IMPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400714 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400715 client->impsseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400717 mousedev_generate_response(client, c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400719 spin_unlock_irq(&client->packet_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 }
721
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400722 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400723 wake_up_interruptible(&client->mousedev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
725 return count;
726}
727
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400728static ssize_t mousedev_read(struct file *file, char __user *buffer,
729 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400731 struct mousedev_client *client = file->private_data;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400732 struct mousedev *mousedev = client->mousedev;
733 signed char data[sizeof(client->ps2)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 int retval = 0;
735
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400736 if (!client->ready && !client->buffer && mousedev->exist &&
737 (file->f_flags & O_NONBLOCK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 return -EAGAIN;
739
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400740 retval = wait_event_interruptible(mousedev->wait,
741 !mousedev->exist || client->ready || client->buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 if (retval)
743 return retval;
744
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400745 if (!mousedev->exist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 return -ENODEV;
747
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400748 spin_lock_irq(&client->packet_lock);
749
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400750 if (!client->buffer && client->ready) {
751 mousedev_packet(client, client->ps2);
752 client->buffer = client->bufsiz;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 }
754
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400755 if (count > client->buffer)
756 count = client->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400758 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400759 client->buffer -= count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400761 spin_unlock_irq(&client->packet_lock);
762
763 if (copy_to_user(buffer, data, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 return -EFAULT;
765
766 return count;
767}
768
769/* No kernel lock - fine */
770static unsigned int mousedev_poll(struct file *file, poll_table *wait)
771{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400772 struct mousedev_client *client = file->private_data;
773 struct mousedev *mousedev = client->mousedev;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400774
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400775 poll_wait(file, &mousedev->wait, wait);
776 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
777 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778}
779
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400780static const struct file_operations mousedev_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 .owner = THIS_MODULE,
782 .read = mousedev_read,
783 .write = mousedev_write,
784 .poll = mousedev_poll,
785 .open = mousedev_open,
786 .release = mousedev_release,
787 .fasync = mousedev_fasync,
788};
789
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400790static int mousedev_install_chrdev(struct mousedev *mousedev)
791{
792 mousedev_table[mousedev->minor] = mousedev;
793 return 0;
794}
795
796static void mousedev_remove_chrdev(struct mousedev *mousedev)
797{
798 mutex_lock(&mousedev_table_mutex);
799 mousedev_table[mousedev->minor] = NULL;
800 mutex_unlock(&mousedev_table_mutex);
801}
802
803/*
804 * Mark device non-existent. This disables writes, ioctls and
805 * prevents new users from opening the device. Already posted
806 * blocking reads will stay, however new ones will fail.
807 */
808static void mousedev_mark_dead(struct mousedev *mousedev)
809{
810 mutex_lock(&mousedev->mutex);
811 mousedev->exist = 0;
812 mutex_unlock(&mousedev->mutex);
813}
814
815/*
816 * Wake up users waiting for IO so they can disconnect from
817 * dead device.
818 */
819static void mousedev_hangup(struct mousedev *mousedev)
820{
821 struct mousedev_client *client;
822
823 spin_lock(&mousedev->client_lock);
824 list_for_each_entry(client, &mousedev->client_list, node)
825 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
826 spin_unlock(&mousedev->client_lock);
827
828 wake_up_interruptible(&mousedev->wait);
829}
830
831static void mousedev_cleanup(struct mousedev *mousedev)
832{
833 struct input_handle *handle = &mousedev->handle;
834
835 mousedev_mark_dead(mousedev);
836 mousedev_hangup(mousedev);
837 mousedev_remove_chrdev(mousedev);
838
839 /* mousedev is marked dead so no one else accesses mousedev->open */
840 if (mousedev->open)
841 input_close_device(handle);
842}
843
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400844static struct mousedev *mousedev_create(struct input_dev *dev,
845 struct input_handler *handler,
846 int minor)
847{
848 struct mousedev *mousedev;
849 int error;
850
851 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
852 if (!mousedev) {
853 error = -ENOMEM;
854 goto err_out;
855 }
856
857 INIT_LIST_HEAD(&mousedev->client_list);
858 INIT_LIST_HEAD(&mousedev->mixdev_node);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400859 spin_lock_init(&mousedev->client_lock);
860 mutex_init(&mousedev->mutex);
861 lockdep_set_subclass(&mousedev->mutex,
862 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400863 init_waitqueue_head(&mousedev->wait);
864
865 if (minor == MOUSEDEV_MIX)
866 strlcpy(mousedev->name, "mice", sizeof(mousedev->name));
867 else
868 snprintf(mousedev->name, sizeof(mousedev->name),
869 "mouse%d", minor);
870
871 mousedev->minor = minor;
872 mousedev->exist = 1;
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400873 mousedev->handle.dev = input_get_device(dev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400874 mousedev->handle.name = mousedev->name;
875 mousedev->handle.handler = handler;
876 mousedev->handle.private = mousedev;
877
Kay Sieversa6c24902008-10-30 00:07:50 -0400878 dev_set_name(&mousedev->dev, mousedev->name);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400879 mousedev->dev.class = &input_class;
880 if (dev)
881 mousedev->dev.parent = &dev->dev;
882 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
883 mousedev->dev.release = mousedev_free;
884 device_initialize(&mousedev->dev);
885
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400886 if (minor != MOUSEDEV_MIX) {
887 error = input_register_handle(&mousedev->handle);
888 if (error)
889 goto err_free_mousedev;
890 }
891
892 error = mousedev_install_chrdev(mousedev);
893 if (error)
894 goto err_unregister_handle;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400895
896 error = device_add(&mousedev->dev);
897 if (error)
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400898 goto err_cleanup_mousedev;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400899
900 return mousedev;
901
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400902 err_cleanup_mousedev:
903 mousedev_cleanup(mousedev);
904 err_unregister_handle:
905 if (minor != MOUSEDEV_MIX)
906 input_unregister_handle(&mousedev->handle);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400907 err_free_mousedev:
908 put_device(&mousedev->dev);
909 err_out:
910 return ERR_PTR(error);
911}
912
913static void mousedev_destroy(struct mousedev *mousedev)
914{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400915 device_del(&mousedev->dev);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400916 mousedev_cleanup(mousedev);
917 if (mousedev->minor != MOUSEDEV_MIX)
918 input_unregister_handle(&mousedev->handle);
919 put_device(&mousedev->dev);
920}
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400921
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400922static int mixdev_add_device(struct mousedev *mousedev)
923{
924 int retval;
925
926 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
927 if (retval)
928 return retval;
929
930 if (mousedev_mix->open) {
931 retval = mousedev_open_device(mousedev);
932 if (retval)
933 goto out;
934
935 mousedev->mixdev_open = 1;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400936 }
937
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400938 get_device(&mousedev->dev);
939 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
940
941 out:
942 mutex_unlock(&mousedev_mix->mutex);
943 return retval;
944}
945
946static void mixdev_remove_device(struct mousedev *mousedev)
947{
948 mutex_lock(&mousedev_mix->mutex);
949
950 if (mousedev->mixdev_open) {
951 mousedev->mixdev_open = 0;
952 mousedev_close_device(mousedev);
953 }
954
955 list_del_init(&mousedev->mixdev_node);
956 mutex_unlock(&mousedev_mix->mutex);
957
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400958 put_device(&mousedev->dev);
959}
960
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400961static int mousedev_connect(struct input_handler *handler,
962 struct input_dev *dev,
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400963 const struct input_device_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964{
965 struct mousedev *mousedev;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400966 int minor;
967 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400969 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
970 if (!mousedev_table[minor])
971 break;
972
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 if (minor == MOUSEDEV_MINORS) {
974 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400975 return -ENFILE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 }
977
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400978 mousedev = mousedev_create(dev, handler, minor);
979 if (IS_ERR(mousedev))
980 return PTR_ERR(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400982 error = mixdev_add_device(mousedev);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400983 if (error) {
984 mousedev_destroy(mousedev);
985 return error;
986 }
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400987
988 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989}
990
991static void mousedev_disconnect(struct input_handle *handle)
992{
993 struct mousedev *mousedev = handle->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400995 mixdev_remove_device(mousedev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400996 mousedev_destroy(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997}
998
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400999static const struct input_device_id mousedev_ids[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001001 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1002 INPUT_DEVICE_ID_MATCH_KEYBIT |
1003 INPUT_DEVICE_ID_MATCH_RELBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001004 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1005 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1006 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001007 }, /* A mouse like device, at least one button,
1008 two relative axes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001010 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1011 INPUT_DEVICE_ID_MATCH_RELBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001012 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1013 .relbit = { BIT_MASK(REL_WHEEL) },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 }, /* A separate scrollwheel */
1015 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001016 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1017 INPUT_DEVICE_ID_MATCH_KEYBIT |
1018 INPUT_DEVICE_ID_MATCH_ABSBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001019 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1020 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1021 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001022 }, /* A tablet like device, at least touch detection,
1023 two absolute axes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001025 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1026 INPUT_DEVICE_ID_MATCH_KEYBIT |
1027 INPUT_DEVICE_ID_MATCH_ABSBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001028 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1029 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1030 BIT_MASK(BTN_TOOL_FINGER) },
1031 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1032 BIT_MASK(ABS_PRESSURE) |
1033 BIT_MASK(ABS_TOOL_WIDTH) },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 }, /* A touchpad */
Micah Parrish6724f932008-01-17 12:01:04 -05001035 {
1036 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1037 INPUT_DEVICE_ID_MATCH_KEYBIT |
1038 INPUT_DEVICE_ID_MATCH_ABSBIT,
Dmitry Torokhovd182c102008-01-30 16:33:40 -05001039 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
Micah Parrish6724f932008-01-17 12:01:04 -05001040 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1041 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1042 }, /* Mouse-like device with absolute X and Y but ordinary
1043 clicks, like hp ILO2 High Performance mouse */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -04001045 { }, /* Terminating entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046};
1047
1048MODULE_DEVICE_TABLE(input, mousedev_ids);
1049
1050static struct input_handler mousedev_handler = {
1051 .event = mousedev_event,
1052 .connect = mousedev_connect,
1053 .disconnect = mousedev_disconnect,
1054 .fops = &mousedev_fops,
1055 .minor = MOUSEDEV_MINOR_BASE,
1056 .name = "mousedev",
1057 .id_table = mousedev_ids,
1058};
1059
1060#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1061static struct miscdevice psaux_mouse = {
1062 PSMOUSE_MINOR, "psaux", &mousedev_fops
1063};
1064static int psaux_registered;
1065#endif
1066
1067static int __init mousedev_init(void)
1068{
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001069 int error;
1070
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001071 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1072 if (IS_ERR(mousedev_mix))
1073 return PTR_ERR(mousedev_mix);
1074
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001075 error = input_register_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001076 if (error) {
1077 mousedev_destroy(mousedev_mix);
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001078 return error;
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001079 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080
1081#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001082 error = misc_register(&psaux_mouse);
1083 if (error)
1084 printk(KERN_WARNING "mice: could not register psaux device, "
1085 "error: %d\n", error);
1086 else
1087 psaux_registered = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088#endif
1089
1090 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1091
1092 return 0;
1093}
1094
1095static void __exit mousedev_exit(void)
1096{
1097#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1098 if (psaux_registered)
1099 misc_deregister(&psaux_mouse);
1100#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 input_unregister_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001102 mousedev_destroy(mousedev_mix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103}
1104
1105module_init(mousedev_init);
1106module_exit(mousedev_exit);