blob: 7630273e9474051c3ba4886012e61f1088b43a81 [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
Joe Perchesda0c4902010-11-29 23:33:07 -080012#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
Dmitry Torokhov4f004692005-09-15 02:01:38 -050014#define MOUSEDEV_MINOR_BASE 32
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#define MOUSEDEV_MINORS 32
16#define MOUSEDEV_MIX 31
17
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040018#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/slab.h>
20#include <linux/poll.h>
21#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
23#include <linux/input.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/random.h>
25#include <linux/major.h>
26#include <linux/device.h>
Daniel Mack987a6c02010-08-02 20:15:17 -070027#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
29#include <linux/miscdevice.h>
30#endif
31
32MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
33MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
34MODULE_LICENSE("GPL");
35
36#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
37#define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
38#endif
39#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
40#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
41#endif
42
43static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
Dmitry Torokhov84c12b22005-12-11 12:41:03 -050044module_param(xres, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045MODULE_PARM_DESC(xres, "Horizontal screen resolution");
46
47static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
Dmitry Torokhov84c12b22005-12-11 12:41:03 -050048module_param(yres, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049MODULE_PARM_DESC(yres, "Vertical screen resolution");
50
51static unsigned tap_time = 200;
Dmitry Torokhov84c12b22005-12-11 12:41:03 -050052module_param(tap_time, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
54
55struct mousedev_hw_data {
56 int dx, dy, dz;
57 int x, y;
58 int abs_event;
59 unsigned long buttons;
60};
61
62struct mousedev {
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 int open;
64 int minor;
Dmitry Torokhov464b2412007-08-30 00:22:24 -040065 struct input_handle handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 wait_queue_head_t wait;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040067 struct list_head client_list;
Dmitry Torokhov464b2412007-08-30 00:22:24 -040068 spinlock_t client_lock; /* protects client_list */
69 struct mutex mutex;
Dmitry Torokhov9657d752007-06-14 23:32:24 -040070 struct device dev;
Dmitry Torokhov20da92d2010-07-15 23:27:36 -070071 bool exist;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Dmitry Torokhovd542ed82007-04-12 01:30:15 -040073 struct list_head mixdev_node;
74 int mixdev_open;
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 struct mousedev_hw_data packet;
77 unsigned int pkt_count;
78 int old_x[4], old_y[4];
79 int frac_dx, frac_dy;
80 unsigned long touch;
81};
82
83enum mousedev_emul {
84 MOUSEDEV_EMUL_PS2,
85 MOUSEDEV_EMUL_IMPS,
86 MOUSEDEV_EMUL_EXPS
87};
88
89struct mousedev_motion {
90 int dx, dy, dz;
91 unsigned long buttons;
92};
93
94#define PACKET_QUEUE_LEN 16
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040095struct mousedev_client {
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 struct fasync_struct *fasync;
97 struct mousedev *mousedev;
98 struct list_head node;
99
100 struct mousedev_motion packets[PACKET_QUEUE_LEN];
101 unsigned int head, tail;
102 spinlock_t packet_lock;
103 int pos_x, pos_y;
104
105 signed char ps2[6];
106 unsigned char ready, buffer, bufsiz;
107 unsigned char imexseq, impsseq;
108 enum mousedev_emul mode;
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700109 unsigned long last_buttons;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110};
111
112#define MOUSEDEV_SEQ_LEN 6
113
114static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
115static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
116
117static struct input_handler mousedev_handler;
118
119static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400120static DEFINE_MUTEX(mousedev_table_mutex);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400121static struct mousedev *mousedev_mix;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400122static LIST_HEAD(mousedev_mix_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400124static void mixdev_open_devices(void);
125static void mixdev_close_devices(void);
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
128#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
129
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400130static void mousedev_touchpad_event(struct input_dev *dev,
131 struct mousedev *mousedev,
132 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
134 int size, tmp;
135 enum { FRACTION_DENOM = 128 };
136
Dmitry Torokhov0d9d93c2007-04-12 01:31:55 -0400137 switch (code) {
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400138
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400139 case ABS_X:
Daniel Mack987a6c02010-08-02 20:15:17 -0700140
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400141 fx(0) = value;
142 if (mousedev->touch && mousedev->pkt_count >= 2) {
Christoph Fritz268ba5c2010-08-24 00:33:37 -0700143 size = input_abs_get_max(dev, ABS_X) -
144 input_abs_get_min(dev, ABS_X);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400145 if (size == 0)
146 size = 256 * 2;
Daniel Mack987a6c02010-08-02 20:15:17 -0700147
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400148 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
149 tmp += mousedev->frac_dx;
150 mousedev->packet.dx = tmp / FRACTION_DENOM;
151 mousedev->frac_dx =
152 tmp - mousedev->packet.dx * FRACTION_DENOM;
153 }
154 break;
155
156 case ABS_Y:
157 fy(0) = value;
158 if (mousedev->touch && mousedev->pkt_count >= 2) {
Daniel Mack987a6c02010-08-02 20:15:17 -0700159 /* use X size for ABS_Y to keep the same scale */
Christoph Fritz268ba5c2010-08-24 00:33:37 -0700160 size = input_abs_get_max(dev, ABS_X) -
161 input_abs_get_min(dev, ABS_X);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400162 if (size == 0)
163 size = 256 * 2;
Daniel Mack987a6c02010-08-02 20:15:17 -0700164
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400165 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
166 tmp += mousedev->frac_dy;
167 mousedev->packet.dy = tmp / FRACTION_DENOM;
168 mousedev->frac_dy = tmp -
169 mousedev->packet.dy * FRACTION_DENOM;
170 }
171 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 }
173}
174
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400175static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
176 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
Daniel Mack987a6c02010-08-02 20:15:17 -0700178 int min, max, size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 switch (code) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400182 case ABS_X:
Daniel Mack987a6c02010-08-02 20:15:17 -0700183 min = input_abs_get_min(dev, ABS_X);
184 max = input_abs_get_max(dev, ABS_X);
185
186 size = max - min;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400187 if (size == 0)
188 size = xres ? : 1;
Daniel Mack987a6c02010-08-02 20:15:17 -0700189
190 clamp(value, min, max);
191
192 mousedev->packet.x = ((value - min) * xres) / size;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400193 mousedev->packet.abs_event = 1;
194 break;
195
196 case ABS_Y:
Daniel Mack987a6c02010-08-02 20:15:17 -0700197 min = input_abs_get_min(dev, ABS_Y);
198 max = input_abs_get_max(dev, ABS_Y);
199
200 size = max - min;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400201 if (size == 0)
202 size = yres ? : 1;
Daniel Mack987a6c02010-08-02 20:15:17 -0700203
204 clamp(value, min, max);
205
206 mousedev->packet.y = yres - ((value - min) * yres) / size;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400207 mousedev->packet.abs_event = 1;
208 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 }
210}
211
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400212static void mousedev_rel_event(struct mousedev *mousedev,
213 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
215 switch (code) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400216 case REL_X:
217 mousedev->packet.dx += value;
218 break;
219
220 case REL_Y:
221 mousedev->packet.dy -= value;
222 break;
223
224 case REL_WHEEL:
225 mousedev->packet.dz -= value;
226 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 }
228}
229
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400230static void mousedev_key_event(struct mousedev *mousedev,
231 unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
233 int index;
234
235 switch (code) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400236
237 case BTN_TOUCH:
238 case BTN_0:
239 case BTN_LEFT: index = 0; break;
240
241 case BTN_STYLUS:
242 case BTN_1:
243 case BTN_RIGHT: index = 1; break;
244
245 case BTN_2:
246 case BTN_FORWARD:
247 case BTN_STYLUS2:
248 case BTN_MIDDLE: index = 2; break;
249
250 case BTN_3:
251 case BTN_BACK:
252 case BTN_SIDE: index = 3; break;
253
254 case BTN_4:
255 case BTN_EXTRA: index = 4; break;
256
257 default: return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 }
259
260 if (value) {
261 set_bit(index, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400262 set_bit(index, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 } else {
264 clear_bit(index, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400265 clear_bit(index, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 }
267}
268
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400269static void mousedev_notify_readers(struct mousedev *mousedev,
270 struct mousedev_hw_data *packet)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400272 struct mousedev_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 struct mousedev_motion *p;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400274 unsigned int new_head;
Dmitry Torokhov81211522005-06-01 02:39:36 -0500275 int wake_readers = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400277 rcu_read_lock();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400278 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
279
280 /* Just acquire the lock, interrupts already disabled */
281 spin_lock(&client->packet_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400283 p = &client->packets[client->head];
284 if (client->ready && p->buttons != mousedev->packet.buttons) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400285 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400286 if (new_head != client->tail) {
287 p = &client->packets[client->head = new_head];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 memset(p, 0, sizeof(struct mousedev_motion));
289 }
290 }
291
292 if (packet->abs_event) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400293 p->dx += packet->x - client->pos_x;
294 p->dy += packet->y - client->pos_y;
295 client->pos_x = packet->x;
296 client->pos_y = packet->y;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 }
298
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400299 client->pos_x += packet->dx;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400300 client->pos_x = client->pos_x < 0 ?
301 0 : (client->pos_x >= xres ? xres : client->pos_x);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400302 client->pos_y += packet->dy;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400303 client->pos_y = client->pos_y < 0 ?
304 0 : (client->pos_y >= yres ? yres : client->pos_y);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306 p->dx += packet->dx;
307 p->dy += packet->dy;
308 p->dz += packet->dz;
309 p->buttons = mousedev->packet.buttons;
310
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400311 if (p->dx || p->dy || p->dz ||
312 p->buttons != client->last_buttons)
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400313 client->ready = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400315 spin_unlock(&client->packet_lock);
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700316
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400317 if (client->ready) {
318 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhov81211522005-06-01 02:39:36 -0500319 wake_readers = 1;
320 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 }
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400322 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Dmitry Torokhov81211522005-06-01 02:39:36 -0500324 if (wake_readers)
325 wake_up_interruptible(&mousedev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327
328static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
329{
330 if (!value) {
331 if (mousedev->touch &&
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400332 time_before(jiffies,
333 mousedev->touch + msecs_to_jiffies(tap_time))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 /*
335 * Toggle left button to emulate tap.
336 * We rely on the fact that mousedev_mix always has 0
337 * motion packet so we won't mess current position.
338 */
339 set_bit(0, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400340 set_bit(0, &mousedev_mix->packet.buttons);
341 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400342 mousedev_notify_readers(mousedev_mix,
343 &mousedev_mix->packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 clear_bit(0, &mousedev->packet.buttons);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400345 clear_bit(0, &mousedev_mix->packet.buttons);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
347 mousedev->touch = mousedev->pkt_count = 0;
348 mousedev->frac_dx = 0;
349 mousedev->frac_dy = 0;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400350
351 } else if (!mousedev->touch)
352 mousedev->touch = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353}
354
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400355static void mousedev_event(struct input_handle *handle,
356 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
358 struct mousedev *mousedev = handle->private;
359
360 switch (type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400362 case EV_ABS:
363 /* Ignore joysticks */
364 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
365 return;
366
367 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
368 mousedev_touchpad_event(handle->dev,
369 mousedev, code, value);
370 else
371 mousedev_abs_event(handle->dev, mousedev, code, value);
372
373 break;
374
375 case EV_REL:
376 mousedev_rel_event(mousedev, code, value);
377 break;
378
379 case EV_KEY:
380 if (value != 2) {
381 if (code == BTN_TOUCH &&
382 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
383 mousedev_touchpad_touch(mousedev, value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 else
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400385 mousedev_key_event(mousedev, code, value);
386 }
387 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400389 case EV_SYN:
390 if (code == SYN_REPORT) {
391 if (mousedev->touch) {
392 mousedev->pkt_count++;
393 /*
394 * Input system eats duplicate events,
395 * but we need all of them to do correct
396 * averaging so apply present one forward
397 */
398 fx(0) = fx(1);
399 fy(0) = fy(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400402 mousedev_notify_readers(mousedev, &mousedev->packet);
403 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400405 mousedev->packet.dx = mousedev->packet.dy =
406 mousedev->packet.dz = 0;
407 mousedev->packet.abs_event = 0;
408 }
409 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 }
411}
412
413static int mousedev_fasync(int fd, struct file *file, int on)
414{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400415 struct mousedev_client *client = file->private_data;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400416
Jonathan Corbet60aa4922009-02-01 14:52:56 -0700417 return fasync_helper(fd, file, on, &client->fasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400420static void mousedev_free(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400422 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
423
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400424 input_put_device(mousedev->handle.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 kfree(mousedev);
426}
427
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400428static int mousedev_open_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400430 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400432 retval = mutex_lock_interruptible(&mousedev->mutex);
433 if (retval)
434 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400436 if (mousedev->minor == MOUSEDEV_MIX)
437 mixdev_open_devices();
438 else if (!mousedev->exist)
439 retval = -ENODEV;
Oliver Neukum06445012007-10-12 14:18:40 -0400440 else if (!mousedev->open++) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400441 retval = input_open_device(&mousedev->handle);
Oliver Neukum06445012007-10-12 14:18:40 -0400442 if (retval)
443 mousedev->open--;
444 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400446 mutex_unlock(&mousedev->mutex);
447 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400450static void mousedev_close_device(struct mousedev *mousedev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400452 mutex_lock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400453
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400454 if (mousedev->minor == MOUSEDEV_MIX)
455 mixdev_close_devices();
456 else if (mousedev->exist && !--mousedev->open)
457 input_close_device(&mousedev->handle);
458
459 mutex_unlock(&mousedev->mutex);
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400460}
461
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400462/*
463 * Open all available devices so they can all be multiplexed in one.
464 * stream. Note that this function is called with mousedev_mix->mutex
465 * held.
466 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400467static void mixdev_open_devices(void)
468{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400470
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400471 if (mousedev_mix->open++)
472 return;
473
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400474 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400475 if (!mousedev->mixdev_open) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400476 if (mousedev_open_device(mousedev))
477 continue;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400478
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400479 mousedev->mixdev_open = 1;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400480 }
481 }
482}
483
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400484/*
485 * Close all devices that were opened as part of multiplexed
486 * device. Note that this function is called with mousedev_mix->mutex
487 * held.
488 */
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400489static void mixdev_close_devices(void)
490{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400491 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400492
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400493 if (--mousedev_mix->open)
494 return;
495
496 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400497 if (mousedev->mixdev_open) {
498 mousedev->mixdev_open = 0;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400499 mousedev_close_device(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
501 }
502}
503
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400504
505static void mousedev_attach_client(struct mousedev *mousedev,
506 struct mousedev_client *client)
507{
508 spin_lock(&mousedev->client_lock);
509 list_add_tail_rcu(&client->node, &mousedev->client_list);
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
514static void mousedev_detach_client(struct mousedev *mousedev,
515 struct mousedev_client *client)
516{
517 spin_lock(&mousedev->client_lock);
518 list_del_rcu(&client->node);
519 spin_unlock(&mousedev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400520 synchronize_rcu();
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400521}
522
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400523static int mousedev_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400525 struct mousedev_client *client = file->private_data;
526 struct mousedev *mousedev = client->mousedev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400528 mousedev_detach_client(mousedev, client);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400529 kfree(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400531 mousedev_close_device(mousedev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400532 put_device(&mousedev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 return 0;
535}
536
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400537static int mousedev_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400539 struct mousedev_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 struct mousedev *mousedev;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400541 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 int i;
543
544#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
545 if (imajor(inode) == MISC_MAJOR)
546 i = MOUSEDEV_MIX;
547 else
548#endif
549 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
550
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400551 if (i >= MOUSEDEV_MINORS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 return -ENODEV;
553
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400554 error = mutex_lock_interruptible(&mousedev_table_mutex);
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200555 if (error) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400556 return error;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200557 }
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400558 mousedev = mousedev_table[i];
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400559 if (mousedev)
560 get_device(&mousedev->dev);
561 mutex_unlock(&mousedev_table_mutex);
562
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200563 if (!mousedev) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400564 return -ENODEV;
Arnd Bergmannf9c81542008-05-20 19:16:20 +0200565 }
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400566
567 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400568 if (!client) {
569 error = -ENOMEM;
570 goto err_put_mousedev;
571 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400573 spin_lock_init(&client->packet_lock);
574 client->pos_x = xres / 2;
575 client->pos_y = yres / 2;
576 client->mousedev = mousedev;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400577 mousedev_attach_client(mousedev, client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400579 error = mousedev_open_device(mousedev);
580 if (error)
581 goto err_free_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400583 file->private_data = client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 return 0;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400585
586 err_free_client:
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400587 mousedev_detach_client(mousedev, client);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400588 kfree(client);
589 err_put_mousedev:
590 put_device(&mousedev->dev);
591 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592}
593
594static inline int mousedev_limit_delta(int delta, int limit)
595{
596 return delta > limit ? limit : (delta < -limit ? -limit : delta);
597}
598
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400599static void mousedev_packet(struct mousedev_client *client,
600 signed char *ps2_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601{
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400602 struct mousedev_motion *p = &client->packets[client->tail];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400604 ps2_data[0] = 0x08 |
605 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
607 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
608 p->dx -= ps2_data[1];
609 p->dy -= ps2_data[2];
610
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400611 switch (client->mode) {
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400612 case MOUSEDEV_EMUL_EXPS:
613 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
614 p->dz -= ps2_data[3];
615 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
616 client->bufsiz = 4;
617 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400619 case MOUSEDEV_EMUL_IMPS:
620 ps2_data[0] |=
621 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
622 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
623 p->dz -= ps2_data[3];
624 client->bufsiz = 4;
625 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400627 case MOUSEDEV_EMUL_PS2:
628 default:
629 ps2_data[0] |=
630 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
631 p->dz = 0;
632 client->bufsiz = 3;
633 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 }
635
636 if (!p->dx && !p->dy && !p->dz) {
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400637 if (client->tail == client->head) {
638 client->ready = 0;
639 client->last_buttons = p->buttons;
Pavel Machekc1e4c8d2005-05-27 12:53:03 -0700640 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400641 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643}
644
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400645static void mousedev_generate_response(struct mousedev_client *client,
646 int command)
647{
648 client->ps2[0] = 0xfa; /* ACK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400650 switch (command) {
651
652 case 0xeb: /* Poll */
653 mousedev_packet(client, &client->ps2[1]);
654 client->bufsiz++; /* account for leading ACK */
655 break;
656
657 case 0xf2: /* Get ID */
658 switch (client->mode) {
659 case MOUSEDEV_EMUL_PS2:
660 client->ps2[1] = 0;
661 break;
662 case MOUSEDEV_EMUL_IMPS:
663 client->ps2[1] = 3;
664 break;
665 case MOUSEDEV_EMUL_EXPS:
666 client->ps2[1] = 4;
667 break;
668 }
669 client->bufsiz = 2;
670 break;
671
672 case 0xe9: /* Get info */
673 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
674 client->bufsiz = 4;
675 break;
676
677 case 0xff: /* Reset */
678 client->impsseq = client->imexseq = 0;
679 client->mode = MOUSEDEV_EMUL_PS2;
680 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
681 client->bufsiz = 3;
682 break;
683
684 default:
685 client->bufsiz = 1;
686 break;
687 }
688 client->buffer = client->bufsiz;
689}
690
691static ssize_t mousedev_write(struct file *file, const char __user *buffer,
692 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400694 struct mousedev_client *client = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 unsigned char c;
696 unsigned int i;
697
698 for (i = 0; i < count; i++) {
699
700 if (get_user(c, buffer + i))
701 return -EFAULT;
702
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400703 spin_lock_irq(&client->packet_lock);
704
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400705 if (c == mousedev_imex_seq[client->imexseq]) {
706 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
707 client->imexseq = 0;
708 client->mode = MOUSEDEV_EMUL_EXPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400710 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400711 client->imexseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400713 if (c == mousedev_imps_seq[client->impsseq]) {
714 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
715 client->impsseq = 0;
716 client->mode = MOUSEDEV_EMUL_IMPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400718 } else
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400719 client->impsseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400721 mousedev_generate_response(client, c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400723 spin_unlock_irq(&client->packet_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 }
725
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400726 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400727 wake_up_interruptible(&client->mousedev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729 return count;
730}
731
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400732static ssize_t mousedev_read(struct file *file, char __user *buffer,
733 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400735 struct mousedev_client *client = file->private_data;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400736 struct mousedev *mousedev = client->mousedev;
737 signed char data[sizeof(client->ps2)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 int retval = 0;
739
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400740 if (!client->ready && !client->buffer && mousedev->exist &&
741 (file->f_flags & O_NONBLOCK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 return -EAGAIN;
743
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400744 retval = wait_event_interruptible(mousedev->wait,
745 !mousedev->exist || client->ready || client->buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 if (retval)
747 return retval;
748
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400749 if (!mousedev->exist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 return -ENODEV;
751
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400752 spin_lock_irq(&client->packet_lock);
753
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400754 if (!client->buffer && client->ready) {
755 mousedev_packet(client, client->ps2);
756 client->buffer = client->bufsiz;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 }
758
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400759 if (count > client->buffer)
760 count = client->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400762 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400763 client->buffer -= count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400765 spin_unlock_irq(&client->packet_lock);
766
767 if (copy_to_user(buffer, data, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 return -EFAULT;
769
770 return count;
771}
772
773/* No kernel lock - fine */
774static unsigned int mousedev_poll(struct file *file, poll_table *wait)
775{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400776 struct mousedev_client *client = file->private_data;
777 struct mousedev *mousedev = client->mousedev;
Julien Moutinho4d4bf992010-07-15 23:27:56 -0700778 unsigned int mask;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400779
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400780 poll_wait(file, &mousedev->wait, wait);
Julien Moutinho4d4bf992010-07-15 23:27:56 -0700781
782 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
783 if (client->ready || client->buffer)
784 mask |= POLLIN | POLLRDNORM;
785
786 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787}
788
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400789static const struct file_operations mousedev_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 .owner = THIS_MODULE,
791 .read = mousedev_read,
792 .write = mousedev_write,
793 .poll = mousedev_poll,
794 .open = mousedev_open,
795 .release = mousedev_release,
796 .fasync = mousedev_fasync,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200797 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798};
799
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400800static int mousedev_install_chrdev(struct mousedev *mousedev)
801{
802 mousedev_table[mousedev->minor] = mousedev;
803 return 0;
804}
805
806static void mousedev_remove_chrdev(struct mousedev *mousedev)
807{
808 mutex_lock(&mousedev_table_mutex);
809 mousedev_table[mousedev->minor] = NULL;
810 mutex_unlock(&mousedev_table_mutex);
811}
812
813/*
814 * Mark device non-existent. This disables writes, ioctls and
815 * prevents new users from opening the device. Already posted
816 * blocking reads will stay, however new ones will fail.
817 */
818static void mousedev_mark_dead(struct mousedev *mousedev)
819{
820 mutex_lock(&mousedev->mutex);
Dmitry Torokhov20da92d2010-07-15 23:27:36 -0700821 mousedev->exist = false;
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400822 mutex_unlock(&mousedev->mutex);
823}
824
825/*
826 * Wake up users waiting for IO so they can disconnect from
827 * dead device.
828 */
829static void mousedev_hangup(struct mousedev *mousedev)
830{
831 struct mousedev_client *client;
832
833 spin_lock(&mousedev->client_lock);
834 list_for_each_entry(client, &mousedev->client_list, node)
835 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
836 spin_unlock(&mousedev->client_lock);
837
838 wake_up_interruptible(&mousedev->wait);
839}
840
841static void mousedev_cleanup(struct mousedev *mousedev)
842{
843 struct input_handle *handle = &mousedev->handle;
844
845 mousedev_mark_dead(mousedev);
846 mousedev_hangup(mousedev);
847 mousedev_remove_chrdev(mousedev);
848
849 /* mousedev is marked dead so no one else accesses mousedev->open */
850 if (mousedev->open)
851 input_close_device(handle);
852}
853
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400854static struct mousedev *mousedev_create(struct input_dev *dev,
855 struct input_handler *handler,
856 int minor)
857{
858 struct mousedev *mousedev;
859 int error;
860
861 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
862 if (!mousedev) {
863 error = -ENOMEM;
864 goto err_out;
865 }
866
867 INIT_LIST_HEAD(&mousedev->client_list);
868 INIT_LIST_HEAD(&mousedev->mixdev_node);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400869 spin_lock_init(&mousedev->client_lock);
870 mutex_init(&mousedev->mutex);
871 lockdep_set_subclass(&mousedev->mutex,
Hitoshi Mitakef74eef92010-10-13 11:35:40 -0700872 minor == MOUSEDEV_MIX ? SINGLE_DEPTH_NESTING : 0);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400873 init_waitqueue_head(&mousedev->wait);
874
875 if (minor == MOUSEDEV_MIX)
Thadeu Lima de Souza Cascardo3d5cb602009-05-09 16:08:04 -0700876 dev_set_name(&mousedev->dev, "mice");
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400877 else
Thadeu Lima de Souza Cascardo3d5cb602009-05-09 16:08:04 -0700878 dev_set_name(&mousedev->dev, "mouse%d", minor);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400879
880 mousedev->minor = minor;
Dmitry Torokhov20da92d2010-07-15 23:27:36 -0700881 mousedev->exist = true;
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400882 mousedev->handle.dev = input_get_device(dev);
Thadeu Lima de Souza Cascardo3d5cb602009-05-09 16:08:04 -0700883 mousedev->handle.name = dev_name(&mousedev->dev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400884 mousedev->handle.handler = handler;
885 mousedev->handle.private = mousedev;
886
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400887 mousedev->dev.class = &input_class;
888 if (dev)
889 mousedev->dev.parent = &dev->dev;
890 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
891 mousedev->dev.release = mousedev_free;
892 device_initialize(&mousedev->dev);
893
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400894 if (minor != MOUSEDEV_MIX) {
895 error = input_register_handle(&mousedev->handle);
896 if (error)
897 goto err_free_mousedev;
898 }
899
900 error = mousedev_install_chrdev(mousedev);
901 if (error)
902 goto err_unregister_handle;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400903
904 error = device_add(&mousedev->dev);
905 if (error)
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400906 goto err_cleanup_mousedev;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400907
908 return mousedev;
909
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400910 err_cleanup_mousedev:
911 mousedev_cleanup(mousedev);
912 err_unregister_handle:
913 if (minor != MOUSEDEV_MIX)
914 input_unregister_handle(&mousedev->handle);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400915 err_free_mousedev:
916 put_device(&mousedev->dev);
917 err_out:
918 return ERR_PTR(error);
919}
920
921static void mousedev_destroy(struct mousedev *mousedev)
922{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400923 device_del(&mousedev->dev);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400924 mousedev_cleanup(mousedev);
925 if (mousedev->minor != MOUSEDEV_MIX)
926 input_unregister_handle(&mousedev->handle);
927 put_device(&mousedev->dev);
928}
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400929
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400930static int mixdev_add_device(struct mousedev *mousedev)
931{
932 int retval;
933
934 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
935 if (retval)
936 return retval;
937
938 if (mousedev_mix->open) {
939 retval = mousedev_open_device(mousedev);
940 if (retval)
941 goto out;
942
943 mousedev->mixdev_open = 1;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400944 }
945
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400946 get_device(&mousedev->dev);
947 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
948
949 out:
950 mutex_unlock(&mousedev_mix->mutex);
951 return retval;
952}
953
954static void mixdev_remove_device(struct mousedev *mousedev)
955{
956 mutex_lock(&mousedev_mix->mutex);
957
958 if (mousedev->mixdev_open) {
959 mousedev->mixdev_open = 0;
960 mousedev_close_device(mousedev);
961 }
962
963 list_del_init(&mousedev->mixdev_node);
964 mutex_unlock(&mousedev_mix->mutex);
965
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400966 put_device(&mousedev->dev);
967}
968
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400969static int mousedev_connect(struct input_handler *handler,
970 struct input_dev *dev,
Dmitry Torokhov5b2a08262007-04-12 01:29:46 -0400971 const struct input_device_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972{
973 struct mousedev *mousedev;
Dmitry Torokhov5b2a08262007-04-12 01:29:46 -0400974 int minor;
975 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400977 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
978 if (!mousedev_table[minor])
979 break;
980
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 if (minor == MOUSEDEV_MINORS) {
Joe Perchesda0c4902010-11-29 23:33:07 -0800982 pr_err("no more free mousedev devices\n");
Dmitry Torokhov5b2a08262007-04-12 01:29:46 -0400983 return -ENFILE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 }
985
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400986 mousedev = mousedev_create(dev, handler, minor);
987 if (IS_ERR(mousedev))
988 return PTR_ERR(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400990 error = mixdev_add_device(mousedev);
Dmitry Torokhov464b2412007-08-30 00:22:24 -0400991 if (error) {
992 mousedev_destroy(mousedev);
993 return error;
994 }
Dmitry Torokhov5b2a08262007-04-12 01:29:46 -0400995
996 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997}
998
999static void mousedev_disconnect(struct input_handle *handle)
1000{
1001 struct mousedev *mousedev = handle->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Dmitry Torokhovd542ed82007-04-12 01:30:15 -04001003 mixdev_remove_device(mousedev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001004 mousedev_destroy(mousedev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005}
1006
Dmitry Torokhov66e66112006-09-14 01:31:59 -04001007static const struct input_device_id mousedev_ids[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001009 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1010 INPUT_DEVICE_ID_MATCH_KEYBIT |
1011 INPUT_DEVICE_ID_MATCH_RELBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001012 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1013 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1014 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001015 }, /* A mouse like device, at least one button,
1016 two relative axes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001018 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1019 INPUT_DEVICE_ID_MATCH_RELBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001020 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1021 .relbit = { BIT_MASK(REL_WHEEL) },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 }, /* A separate scrollwheel */
1023 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001024 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1025 INPUT_DEVICE_ID_MATCH_KEYBIT |
1026 INPUT_DEVICE_ID_MATCH_ABSBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001027 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1028 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1029 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001030 }, /* A tablet like device, at least touch detection,
1031 two absolute axes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 {
Dmitry Torokhov464b2412007-08-30 00:22:24 -04001033 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1034 INPUT_DEVICE_ID_MATCH_KEYBIT |
1035 INPUT_DEVICE_ID_MATCH_ABSBIT,
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001036 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1037 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1038 BIT_MASK(BTN_TOOL_FINGER) },
1039 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1040 BIT_MASK(ABS_PRESSURE) |
1041 BIT_MASK(ABS_TOOL_WIDTH) },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 }, /* A touchpad */
Micah Parrish6724f932008-01-17 12:01:04 -05001043 {
1044 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1045 INPUT_DEVICE_ID_MATCH_KEYBIT |
1046 INPUT_DEVICE_ID_MATCH_ABSBIT,
Dmitry Torokhovd182c102008-01-30 16:33:40 -05001047 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
Micah Parrish6724f932008-01-17 12:01:04 -05001048 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1049 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1050 }, /* Mouse-like device with absolute X and Y but ordinary
1051 clicks, like hp ILO2 High Performance mouse */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -04001053 { }, /* Terminating entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054};
1055
1056MODULE_DEVICE_TABLE(input, mousedev_ids);
1057
1058static struct input_handler mousedev_handler = {
1059 .event = mousedev_event,
1060 .connect = mousedev_connect,
1061 .disconnect = mousedev_disconnect,
1062 .fops = &mousedev_fops,
1063 .minor = MOUSEDEV_MINOR_BASE,
1064 .name = "mousedev",
1065 .id_table = mousedev_ids,
1066};
1067
1068#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1069static struct miscdevice psaux_mouse = {
1070 PSMOUSE_MINOR, "psaux", &mousedev_fops
1071};
1072static int psaux_registered;
1073#endif
1074
1075static int __init mousedev_init(void)
1076{
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001077 int error;
1078
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001079 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1080 if (IS_ERR(mousedev_mix))
1081 return PTR_ERR(mousedev_mix);
1082
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001083 error = input_register_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001084 if (error) {
1085 mousedev_destroy(mousedev_mix);
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001086 return error;
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001087 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
1089#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001090 error = misc_register(&psaux_mouse);
1091 if (error)
Joe Perchesda0c4902010-11-29 23:33:07 -08001092 pr_warning("could not register psaux device, error: %d\n",
1093 error);
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001094 else
1095 psaux_registered = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096#endif
1097
Joe Perchesda0c4902010-11-29 23:33:07 -08001098 pr_info("PS/2 mouse device common for all mice\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
1100 return 0;
1101}
1102
1103static void __exit mousedev_exit(void)
1104{
1105#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1106 if (psaux_registered)
1107 misc_deregister(&psaux_mouse);
1108#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 input_unregister_handler(&mousedev_handler);
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001110 mousedev_destroy(mousedev_mix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111}
1112
1113module_init(mousedev_init);
1114module_exit(mousedev_exit);