Commit 8905aaafb4b5d9764c5b4b54c7d03eb41bb0a7e9

Authored by Kay Sievers
Committed by Dmitry Torokhov
1 parent 77edf0c751

Input: uinput - add devname alias to allow module on-demand load

Recent modprobe and udev versions allow to create device nodes
for modules which are not loaded. Only the first access will cause
the in-kernel module loader to pull-in the module. Systems which
never access the device node will not needlessly load the module,
and no longer need init scripts or other facilities to unconditionally
load it.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Showing 3 changed files with 3 additions and 1 deletions Inline Diff

drivers/input/misc/uinput.c
1 /* 1 /*
2 * User level driver support for input subsystem 2 * User level driver support for input subsystem
3 * 3 *
4 * Heavily based on evdev.c by Vojtech Pavlik 4 * Heavily based on evdev.c by Vojtech Pavlik
5 * 5 *
6 * This program is free software; you can redistribute it and/or modify 6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by 7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or 8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version. 9 * (at your option) any later version.
10 * 10 *
11 * This program is distributed in the hope that it will be useful, 11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details. 14 * GNU General Public License for more details.
15 * 15 *
16 * You should have received a copy of the GNU General Public License 16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software 17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * 19 *
20 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> 20 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
21 * 21 *
22 * Changes/Revisions: 22 * Changes/Revisions:
23 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>) 23 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
24 * - updated ff support for the changes in kernel interface 24 * - updated ff support for the changes in kernel interface
25 * - added MODULE_VERSION 25 * - added MODULE_VERSION
26 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) 26 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
27 * - added force feedback support 27 * - added force feedback support
28 * - added UI_SET_PHYS 28 * - added UI_SET_PHYS
29 * 0.1 20/06/2002 29 * 0.1 20/06/2002
30 * - first public version 30 * - first public version
31 */ 31 */
32 #include <linux/poll.h> 32 #include <linux/poll.h>
33 #include <linux/sched.h> 33 #include <linux/sched.h>
34 #include <linux/slab.h> 34 #include <linux/slab.h>
35 #include <linux/module.h> 35 #include <linux/module.h>
36 #include <linux/init.h> 36 #include <linux/init.h>
37 #include <linux/fs.h> 37 #include <linux/fs.h>
38 #include <linux/miscdevice.h> 38 #include <linux/miscdevice.h>
39 #include <linux/uinput.h> 39 #include <linux/uinput.h>
40 #include "../input-compat.h" 40 #include "../input-compat.h"
41 41
42 static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 42 static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
43 { 43 {
44 struct uinput_device *udev = input_get_drvdata(dev); 44 struct uinput_device *udev = input_get_drvdata(dev);
45 45
46 udev->buff[udev->head].type = type; 46 udev->buff[udev->head].type = type;
47 udev->buff[udev->head].code = code; 47 udev->buff[udev->head].code = code;
48 udev->buff[udev->head].value = value; 48 udev->buff[udev->head].value = value;
49 do_gettimeofday(&udev->buff[udev->head].time); 49 do_gettimeofday(&udev->buff[udev->head].time);
50 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; 50 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
51 51
52 wake_up_interruptible(&udev->waitq); 52 wake_up_interruptible(&udev->waitq);
53 53
54 return 0; 54 return 0;
55 } 55 }
56 56
57 /* Atomically allocate an ID for the given request. Returns 0 on success. */ 57 /* Atomically allocate an ID for the given request. Returns 0 on success. */
58 static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request) 58 static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
59 { 59 {
60 int id; 60 int id;
61 int err = -1; 61 int err = -1;
62 62
63 spin_lock(&udev->requests_lock); 63 spin_lock(&udev->requests_lock);
64 64
65 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { 65 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
66 if (!udev->requests[id]) { 66 if (!udev->requests[id]) {
67 request->id = id; 67 request->id = id;
68 udev->requests[id] = request; 68 udev->requests[id] = request;
69 err = 0; 69 err = 0;
70 break; 70 break;
71 } 71 }
72 } 72 }
73 73
74 spin_unlock(&udev->requests_lock); 74 spin_unlock(&udev->requests_lock);
75 return err; 75 return err;
76 } 76 }
77 77
78 static struct uinput_request *uinput_request_find(struct uinput_device *udev, int id) 78 static struct uinput_request *uinput_request_find(struct uinput_device *udev, int id)
79 { 79 {
80 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ 80 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
81 if (id >= UINPUT_NUM_REQUESTS || id < 0) 81 if (id >= UINPUT_NUM_REQUESTS || id < 0)
82 return NULL; 82 return NULL;
83 83
84 return udev->requests[id]; 84 return udev->requests[id];
85 } 85 }
86 86
87 static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request) 87 static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
88 { 88 {
89 /* Allocate slot. If none are available right away, wait. */ 89 /* Allocate slot. If none are available right away, wait. */
90 return wait_event_interruptible(udev->requests_waitq, 90 return wait_event_interruptible(udev->requests_waitq,
91 !uinput_request_alloc_id(udev, request)); 91 !uinput_request_alloc_id(udev, request));
92 } 92 }
93 93
94 static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request) 94 static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
95 { 95 {
96 /* Mark slot as available */ 96 /* Mark slot as available */
97 udev->requests[request->id] = NULL; 97 udev->requests[request->id] = NULL;
98 wake_up(&udev->requests_waitq); 98 wake_up(&udev->requests_waitq);
99 99
100 complete(&request->done); 100 complete(&request->done);
101 } 101 }
102 102
103 static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request) 103 static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request)
104 { 104 {
105 int retval; 105 int retval;
106 106
107 retval = uinput_request_reserve_slot(udev, request); 107 retval = uinput_request_reserve_slot(udev, request);
108 if (retval) 108 if (retval)
109 return retval; 109 return retval;
110 110
111 retval = mutex_lock_interruptible(&udev->mutex); 111 retval = mutex_lock_interruptible(&udev->mutex);
112 if (retval) 112 if (retval)
113 return retval; 113 return retval;
114 114
115 if (udev->state != UIST_CREATED) { 115 if (udev->state != UIST_CREATED) {
116 retval = -ENODEV; 116 retval = -ENODEV;
117 goto out; 117 goto out;
118 } 118 }
119 119
120 /* Tell our userspace app about this new request by queueing an input event */ 120 /* Tell our userspace app about this new request by queueing an input event */
121 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); 121 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
122 122
123 out: 123 out:
124 mutex_unlock(&udev->mutex); 124 mutex_unlock(&udev->mutex);
125 return retval; 125 return retval;
126 } 126 }
127 127
128 /* 128 /*
129 * Fail all ouitstanding requests so handlers don't wait for the userspace 129 * Fail all ouitstanding requests so handlers don't wait for the userspace
130 * to finish processing them. 130 * to finish processing them.
131 */ 131 */
132 static void uinput_flush_requests(struct uinput_device *udev) 132 static void uinput_flush_requests(struct uinput_device *udev)
133 { 133 {
134 struct uinput_request *request; 134 struct uinput_request *request;
135 int i; 135 int i;
136 136
137 spin_lock(&udev->requests_lock); 137 spin_lock(&udev->requests_lock);
138 138
139 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { 139 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
140 request = udev->requests[i]; 140 request = udev->requests[i];
141 if (request) { 141 if (request) {
142 request->retval = -ENODEV; 142 request->retval = -ENODEV;
143 uinput_request_done(udev, request); 143 uinput_request_done(udev, request);
144 } 144 }
145 } 145 }
146 146
147 spin_unlock(&udev->requests_lock); 147 spin_unlock(&udev->requests_lock);
148 } 148 }
149 149
150 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) 150 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
151 { 151 {
152 uinput_dev_event(dev, EV_FF, FF_GAIN, gain); 152 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
153 } 153 }
154 154
155 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) 155 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
156 { 156 {
157 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); 157 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
158 } 158 }
159 159
160 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) 160 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
161 { 161 {
162 return uinput_dev_event(dev, EV_FF, effect_id, value); 162 return uinput_dev_event(dev, EV_FF, effect_id, value);
163 } 163 }
164 164
165 static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old) 165 static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
166 { 166 {
167 struct uinput_device *udev = input_get_drvdata(dev); 167 struct uinput_device *udev = input_get_drvdata(dev);
168 struct uinput_request request; 168 struct uinput_request request;
169 int retval; 169 int retval;
170 170
171 /* 171 /*
172 * uinput driver does not currently support periodic effects with 172 * uinput driver does not currently support periodic effects with
173 * custom waveform since it does not have a way to pass buffer of 173 * custom waveform since it does not have a way to pass buffer of
174 * samples (custom_data) to userspace. If ever there is a device 174 * samples (custom_data) to userspace. If ever there is a device
175 * supporting custom waveforms we would need to define an additional 175 * supporting custom waveforms we would need to define an additional
176 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. 176 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
177 */ 177 */
178 if (effect->type == FF_PERIODIC && 178 if (effect->type == FF_PERIODIC &&
179 effect->u.periodic.waveform == FF_CUSTOM) 179 effect->u.periodic.waveform == FF_CUSTOM)
180 return -EINVAL; 180 return -EINVAL;
181 181
182 request.id = -1; 182 request.id = -1;
183 init_completion(&request.done); 183 init_completion(&request.done);
184 request.code = UI_FF_UPLOAD; 184 request.code = UI_FF_UPLOAD;
185 request.u.upload.effect = effect; 185 request.u.upload.effect = effect;
186 request.u.upload.old = old; 186 request.u.upload.old = old;
187 187
188 retval = uinput_request_submit(udev, &request); 188 retval = uinput_request_submit(udev, &request);
189 if (!retval) { 189 if (!retval) {
190 wait_for_completion(&request.done); 190 wait_for_completion(&request.done);
191 retval = request.retval; 191 retval = request.retval;
192 } 192 }
193 193
194 return retval; 194 return retval;
195 } 195 }
196 196
197 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) 197 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
198 { 198 {
199 struct uinput_device *udev = input_get_drvdata(dev); 199 struct uinput_device *udev = input_get_drvdata(dev);
200 struct uinput_request request; 200 struct uinput_request request;
201 int retval; 201 int retval;
202 202
203 if (!test_bit(EV_FF, dev->evbit)) 203 if (!test_bit(EV_FF, dev->evbit))
204 return -ENOSYS; 204 return -ENOSYS;
205 205
206 request.id = -1; 206 request.id = -1;
207 init_completion(&request.done); 207 init_completion(&request.done);
208 request.code = UI_FF_ERASE; 208 request.code = UI_FF_ERASE;
209 request.u.effect_id = effect_id; 209 request.u.effect_id = effect_id;
210 210
211 retval = uinput_request_submit(udev, &request); 211 retval = uinput_request_submit(udev, &request);
212 if (!retval) { 212 if (!retval) {
213 wait_for_completion(&request.done); 213 wait_for_completion(&request.done);
214 retval = request.retval; 214 retval = request.retval;
215 } 215 }
216 216
217 return retval; 217 return retval;
218 } 218 }
219 219
220 static void uinput_destroy_device(struct uinput_device *udev) 220 static void uinput_destroy_device(struct uinput_device *udev)
221 { 221 {
222 const char *name, *phys; 222 const char *name, *phys;
223 struct input_dev *dev = udev->dev; 223 struct input_dev *dev = udev->dev;
224 enum uinput_state old_state = udev->state; 224 enum uinput_state old_state = udev->state;
225 225
226 udev->state = UIST_NEW_DEVICE; 226 udev->state = UIST_NEW_DEVICE;
227 227
228 if (dev) { 228 if (dev) {
229 name = dev->name; 229 name = dev->name;
230 phys = dev->phys; 230 phys = dev->phys;
231 if (old_state == UIST_CREATED) { 231 if (old_state == UIST_CREATED) {
232 uinput_flush_requests(udev); 232 uinput_flush_requests(udev);
233 input_unregister_device(dev); 233 input_unregister_device(dev);
234 } else { 234 } else {
235 input_free_device(dev); 235 input_free_device(dev);
236 } 236 }
237 kfree(name); 237 kfree(name);
238 kfree(phys); 238 kfree(phys);
239 udev->dev = NULL; 239 udev->dev = NULL;
240 } 240 }
241 } 241 }
242 242
243 static int uinput_create_device(struct uinput_device *udev) 243 static int uinput_create_device(struct uinput_device *udev)
244 { 244 {
245 struct input_dev *dev = udev->dev; 245 struct input_dev *dev = udev->dev;
246 int error; 246 int error;
247 247
248 if (udev->state != UIST_SETUP_COMPLETE) { 248 if (udev->state != UIST_SETUP_COMPLETE) {
249 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); 249 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
250 return -EINVAL; 250 return -EINVAL;
251 } 251 }
252 252
253 if (udev->ff_effects_max) { 253 if (udev->ff_effects_max) {
254 error = input_ff_create(dev, udev->ff_effects_max); 254 error = input_ff_create(dev, udev->ff_effects_max);
255 if (error) 255 if (error)
256 goto fail1; 256 goto fail1;
257 257
258 dev->ff->upload = uinput_dev_upload_effect; 258 dev->ff->upload = uinput_dev_upload_effect;
259 dev->ff->erase = uinput_dev_erase_effect; 259 dev->ff->erase = uinput_dev_erase_effect;
260 dev->ff->playback = uinput_dev_playback; 260 dev->ff->playback = uinput_dev_playback;
261 dev->ff->set_gain = uinput_dev_set_gain; 261 dev->ff->set_gain = uinput_dev_set_gain;
262 dev->ff->set_autocenter = uinput_dev_set_autocenter; 262 dev->ff->set_autocenter = uinput_dev_set_autocenter;
263 } 263 }
264 264
265 error = input_register_device(udev->dev); 265 error = input_register_device(udev->dev);
266 if (error) 266 if (error)
267 goto fail2; 267 goto fail2;
268 268
269 udev->state = UIST_CREATED; 269 udev->state = UIST_CREATED;
270 270
271 return 0; 271 return 0;
272 272
273 fail2: input_ff_destroy(dev); 273 fail2: input_ff_destroy(dev);
274 fail1: uinput_destroy_device(udev); 274 fail1: uinput_destroy_device(udev);
275 return error; 275 return error;
276 } 276 }
277 277
278 static int uinput_open(struct inode *inode, struct file *file) 278 static int uinput_open(struct inode *inode, struct file *file)
279 { 279 {
280 struct uinput_device *newdev; 280 struct uinput_device *newdev;
281 281
282 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); 282 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
283 if (!newdev) 283 if (!newdev)
284 return -ENOMEM; 284 return -ENOMEM;
285 285
286 mutex_init(&newdev->mutex); 286 mutex_init(&newdev->mutex);
287 spin_lock_init(&newdev->requests_lock); 287 spin_lock_init(&newdev->requests_lock);
288 init_waitqueue_head(&newdev->requests_waitq); 288 init_waitqueue_head(&newdev->requests_waitq);
289 init_waitqueue_head(&newdev->waitq); 289 init_waitqueue_head(&newdev->waitq);
290 newdev->state = UIST_NEW_DEVICE; 290 newdev->state = UIST_NEW_DEVICE;
291 291
292 file->private_data = newdev; 292 file->private_data = newdev;
293 nonseekable_open(inode, file); 293 nonseekable_open(inode, file);
294 294
295 return 0; 295 return 0;
296 } 296 }
297 297
298 static int uinput_validate_absbits(struct input_dev *dev) 298 static int uinput_validate_absbits(struct input_dev *dev)
299 { 299 {
300 unsigned int cnt; 300 unsigned int cnt;
301 int retval = 0; 301 int retval = 0;
302 302
303 for (cnt = 0; cnt < ABS_CNT; cnt++) { 303 for (cnt = 0; cnt < ABS_CNT; cnt++) {
304 if (!test_bit(cnt, dev->absbit)) 304 if (!test_bit(cnt, dev->absbit))
305 continue; 305 continue;
306 306
307 if (input_abs_get_max(dev, cnt) <= input_abs_get_min(dev, cnt)) { 307 if (input_abs_get_max(dev, cnt) <= input_abs_get_min(dev, cnt)) {
308 printk(KERN_DEBUG 308 printk(KERN_DEBUG
309 "%s: invalid abs[%02x] min:%d max:%d\n", 309 "%s: invalid abs[%02x] min:%d max:%d\n",
310 UINPUT_NAME, cnt, 310 UINPUT_NAME, cnt,
311 input_abs_get_min(dev, cnt), 311 input_abs_get_min(dev, cnt),
312 input_abs_get_max(dev, cnt)); 312 input_abs_get_max(dev, cnt));
313 retval = -EINVAL; 313 retval = -EINVAL;
314 break; 314 break;
315 } 315 }
316 316
317 if (input_abs_get_flat(dev, cnt) > 317 if (input_abs_get_flat(dev, cnt) >
318 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) { 318 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
319 printk(KERN_DEBUG 319 printk(KERN_DEBUG
320 "%s: abs_flat #%02x out of range: %d " 320 "%s: abs_flat #%02x out of range: %d "
321 "(min:%d/max:%d)\n", 321 "(min:%d/max:%d)\n",
322 UINPUT_NAME, cnt, 322 UINPUT_NAME, cnt,
323 input_abs_get_flat(dev, cnt), 323 input_abs_get_flat(dev, cnt),
324 input_abs_get_min(dev, cnt), 324 input_abs_get_min(dev, cnt),
325 input_abs_get_max(dev, cnt)); 325 input_abs_get_max(dev, cnt));
326 retval = -EINVAL; 326 retval = -EINVAL;
327 break; 327 break;
328 } 328 }
329 } 329 }
330 return retval; 330 return retval;
331 } 331 }
332 332
333 static int uinput_allocate_device(struct uinput_device *udev) 333 static int uinput_allocate_device(struct uinput_device *udev)
334 { 334 {
335 udev->dev = input_allocate_device(); 335 udev->dev = input_allocate_device();
336 if (!udev->dev) 336 if (!udev->dev)
337 return -ENOMEM; 337 return -ENOMEM;
338 338
339 udev->dev->event = uinput_dev_event; 339 udev->dev->event = uinput_dev_event;
340 input_set_drvdata(udev->dev, udev); 340 input_set_drvdata(udev->dev, udev);
341 341
342 return 0; 342 return 0;
343 } 343 }
344 344
345 static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count) 345 static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
346 { 346 {
347 struct uinput_user_dev *user_dev; 347 struct uinput_user_dev *user_dev;
348 struct input_dev *dev; 348 struct input_dev *dev;
349 char *name; 349 char *name;
350 int i, size; 350 int i, size;
351 int retval; 351 int retval;
352 352
353 if (count != sizeof(struct uinput_user_dev)) 353 if (count != sizeof(struct uinput_user_dev))
354 return -EINVAL; 354 return -EINVAL;
355 355
356 if (!udev->dev) { 356 if (!udev->dev) {
357 retval = uinput_allocate_device(udev); 357 retval = uinput_allocate_device(udev);
358 if (retval) 358 if (retval)
359 return retval; 359 return retval;
360 } 360 }
361 361
362 dev = udev->dev; 362 dev = udev->dev;
363 363
364 user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL); 364 user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
365 if (!user_dev) 365 if (!user_dev)
366 return -ENOMEM; 366 return -ENOMEM;
367 367
368 if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) { 368 if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
369 retval = -EFAULT; 369 retval = -EFAULT;
370 goto exit; 370 goto exit;
371 } 371 }
372 372
373 udev->ff_effects_max = user_dev->ff_effects_max; 373 udev->ff_effects_max = user_dev->ff_effects_max;
374 374
375 size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1; 375 size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
376 if (!size) { 376 if (!size) {
377 retval = -EINVAL; 377 retval = -EINVAL;
378 goto exit; 378 goto exit;
379 } 379 }
380 380
381 kfree(dev->name); 381 kfree(dev->name);
382 dev->name = name = kmalloc(size, GFP_KERNEL); 382 dev->name = name = kmalloc(size, GFP_KERNEL);
383 if (!name) { 383 if (!name) {
384 retval = -ENOMEM; 384 retval = -ENOMEM;
385 goto exit; 385 goto exit;
386 } 386 }
387 strlcpy(name, user_dev->name, size); 387 strlcpy(name, user_dev->name, size);
388 388
389 dev->id.bustype = user_dev->id.bustype; 389 dev->id.bustype = user_dev->id.bustype;
390 dev->id.vendor = user_dev->id.vendor; 390 dev->id.vendor = user_dev->id.vendor;
391 dev->id.product = user_dev->id.product; 391 dev->id.product = user_dev->id.product;
392 dev->id.version = user_dev->id.version; 392 dev->id.version = user_dev->id.version;
393 393
394 for (i = 0; i < ABS_CNT; i++) { 394 for (i = 0; i < ABS_CNT; i++) {
395 input_abs_set_max(dev, i, user_dev->absmax[i]); 395 input_abs_set_max(dev, i, user_dev->absmax[i]);
396 input_abs_set_min(dev, i, user_dev->absmin[i]); 396 input_abs_set_min(dev, i, user_dev->absmin[i]);
397 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); 397 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
398 input_abs_set_flat(dev, i, user_dev->absflat[i]); 398 input_abs_set_flat(dev, i, user_dev->absflat[i]);
399 } 399 }
400 400
401 /* check if absmin/absmax/absfuzz/absflat are filled as 401 /* check if absmin/absmax/absfuzz/absflat are filled as
402 * told in Documentation/input/input-programming.txt */ 402 * told in Documentation/input/input-programming.txt */
403 if (test_bit(EV_ABS, dev->evbit)) { 403 if (test_bit(EV_ABS, dev->evbit)) {
404 retval = uinput_validate_absbits(dev); 404 retval = uinput_validate_absbits(dev);
405 if (retval < 0) 405 if (retval < 0)
406 goto exit; 406 goto exit;
407 } 407 }
408 408
409 udev->state = UIST_SETUP_COMPLETE; 409 udev->state = UIST_SETUP_COMPLETE;
410 retval = count; 410 retval = count;
411 411
412 exit: 412 exit:
413 kfree(user_dev); 413 kfree(user_dev);
414 return retval; 414 return retval;
415 } 415 }
416 416
417 static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count) 417 static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
418 { 418 {
419 struct input_event ev; 419 struct input_event ev;
420 420
421 if (count < input_event_size()) 421 if (count < input_event_size())
422 return -EINVAL; 422 return -EINVAL;
423 423
424 if (input_event_from_user(buffer, &ev)) 424 if (input_event_from_user(buffer, &ev))
425 return -EFAULT; 425 return -EFAULT;
426 426
427 input_event(udev->dev, ev.type, ev.code, ev.value); 427 input_event(udev->dev, ev.type, ev.code, ev.value);
428 428
429 return input_event_size(); 429 return input_event_size();
430 } 430 }
431 431
432 static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 432 static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
433 { 433 {
434 struct uinput_device *udev = file->private_data; 434 struct uinput_device *udev = file->private_data;
435 int retval; 435 int retval;
436 436
437 retval = mutex_lock_interruptible(&udev->mutex); 437 retval = mutex_lock_interruptible(&udev->mutex);
438 if (retval) 438 if (retval)
439 return retval; 439 return retval;
440 440
441 retval = udev->state == UIST_CREATED ? 441 retval = udev->state == UIST_CREATED ?
442 uinput_inject_event(udev, buffer, count) : 442 uinput_inject_event(udev, buffer, count) :
443 uinput_setup_device(udev, buffer, count); 443 uinput_setup_device(udev, buffer, count);
444 444
445 mutex_unlock(&udev->mutex); 445 mutex_unlock(&udev->mutex);
446 446
447 return retval; 447 return retval;
448 } 448 }
449 449
450 static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) 450 static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
451 { 451 {
452 struct uinput_device *udev = file->private_data; 452 struct uinput_device *udev = file->private_data;
453 int retval = 0; 453 int retval = 0;
454 454
455 if (udev->state != UIST_CREATED) 455 if (udev->state != UIST_CREATED)
456 return -ENODEV; 456 return -ENODEV;
457 457
458 if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK)) 458 if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
459 return -EAGAIN; 459 return -EAGAIN;
460 460
461 retval = wait_event_interruptible(udev->waitq, 461 retval = wait_event_interruptible(udev->waitq,
462 udev->head != udev->tail || udev->state != UIST_CREATED); 462 udev->head != udev->tail || udev->state != UIST_CREATED);
463 if (retval) 463 if (retval)
464 return retval; 464 return retval;
465 465
466 retval = mutex_lock_interruptible(&udev->mutex); 466 retval = mutex_lock_interruptible(&udev->mutex);
467 if (retval) 467 if (retval)
468 return retval; 468 return retval;
469 469
470 if (udev->state != UIST_CREATED) { 470 if (udev->state != UIST_CREATED) {
471 retval = -ENODEV; 471 retval = -ENODEV;
472 goto out; 472 goto out;
473 } 473 }
474 474
475 while (udev->head != udev->tail && retval + input_event_size() <= count) { 475 while (udev->head != udev->tail && retval + input_event_size() <= count) {
476 if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) { 476 if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
477 retval = -EFAULT; 477 retval = -EFAULT;
478 goto out; 478 goto out;
479 } 479 }
480 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; 480 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
481 retval += input_event_size(); 481 retval += input_event_size();
482 } 482 }
483 483
484 out: 484 out:
485 mutex_unlock(&udev->mutex); 485 mutex_unlock(&udev->mutex);
486 486
487 return retval; 487 return retval;
488 } 488 }
489 489
490 static unsigned int uinput_poll(struct file *file, poll_table *wait) 490 static unsigned int uinput_poll(struct file *file, poll_table *wait)
491 { 491 {
492 struct uinput_device *udev = file->private_data; 492 struct uinput_device *udev = file->private_data;
493 493
494 poll_wait(file, &udev->waitq, wait); 494 poll_wait(file, &udev->waitq, wait);
495 495
496 if (udev->head != udev->tail) 496 if (udev->head != udev->tail)
497 return POLLIN | POLLRDNORM; 497 return POLLIN | POLLRDNORM;
498 498
499 return 0; 499 return 0;
500 } 500 }
501 501
502 static int uinput_release(struct inode *inode, struct file *file) 502 static int uinput_release(struct inode *inode, struct file *file)
503 { 503 {
504 struct uinput_device *udev = file->private_data; 504 struct uinput_device *udev = file->private_data;
505 505
506 uinput_destroy_device(udev); 506 uinput_destroy_device(udev);
507 kfree(udev); 507 kfree(udev);
508 508
509 return 0; 509 return 0;
510 } 510 }
511 511
512 #ifdef CONFIG_COMPAT 512 #ifdef CONFIG_COMPAT
513 struct uinput_ff_upload_compat { 513 struct uinput_ff_upload_compat {
514 int request_id; 514 int request_id;
515 int retval; 515 int retval;
516 struct ff_effect_compat effect; 516 struct ff_effect_compat effect;
517 struct ff_effect_compat old; 517 struct ff_effect_compat old;
518 }; 518 };
519 519
520 static int uinput_ff_upload_to_user(char __user *buffer, 520 static int uinput_ff_upload_to_user(char __user *buffer,
521 const struct uinput_ff_upload *ff_up) 521 const struct uinput_ff_upload *ff_up)
522 { 522 {
523 if (INPUT_COMPAT_TEST) { 523 if (INPUT_COMPAT_TEST) {
524 struct uinput_ff_upload_compat ff_up_compat; 524 struct uinput_ff_upload_compat ff_up_compat;
525 525
526 ff_up_compat.request_id = ff_up->request_id; 526 ff_up_compat.request_id = ff_up->request_id;
527 ff_up_compat.retval = ff_up->retval; 527 ff_up_compat.retval = ff_up->retval;
528 /* 528 /*
529 * It so happens that the pointer that gives us the trouble 529 * It so happens that the pointer that gives us the trouble
530 * is the last field in the structure. Since we don't support 530 * is the last field in the structure. Since we don't support
531 * custom waveforms in uinput anyway we can just copy the whole 531 * custom waveforms in uinput anyway we can just copy the whole
532 * thing (to the compat size) and ignore the pointer. 532 * thing (to the compat size) and ignore the pointer.
533 */ 533 */
534 memcpy(&ff_up_compat.effect, &ff_up->effect, 534 memcpy(&ff_up_compat.effect, &ff_up->effect,
535 sizeof(struct ff_effect_compat)); 535 sizeof(struct ff_effect_compat));
536 memcpy(&ff_up_compat.old, &ff_up->old, 536 memcpy(&ff_up_compat.old, &ff_up->old,
537 sizeof(struct ff_effect_compat)); 537 sizeof(struct ff_effect_compat));
538 538
539 if (copy_to_user(buffer, &ff_up_compat, 539 if (copy_to_user(buffer, &ff_up_compat,
540 sizeof(struct uinput_ff_upload_compat))) 540 sizeof(struct uinput_ff_upload_compat)))
541 return -EFAULT; 541 return -EFAULT;
542 } else { 542 } else {
543 if (copy_to_user(buffer, ff_up, 543 if (copy_to_user(buffer, ff_up,
544 sizeof(struct uinput_ff_upload))) 544 sizeof(struct uinput_ff_upload)))
545 return -EFAULT; 545 return -EFAULT;
546 } 546 }
547 547
548 return 0; 548 return 0;
549 } 549 }
550 550
551 static int uinput_ff_upload_from_user(const char __user *buffer, 551 static int uinput_ff_upload_from_user(const char __user *buffer,
552 struct uinput_ff_upload *ff_up) 552 struct uinput_ff_upload *ff_up)
553 { 553 {
554 if (INPUT_COMPAT_TEST) { 554 if (INPUT_COMPAT_TEST) {
555 struct uinput_ff_upload_compat ff_up_compat; 555 struct uinput_ff_upload_compat ff_up_compat;
556 556
557 if (copy_from_user(&ff_up_compat, buffer, 557 if (copy_from_user(&ff_up_compat, buffer,
558 sizeof(struct uinput_ff_upload_compat))) 558 sizeof(struct uinput_ff_upload_compat)))
559 return -EFAULT; 559 return -EFAULT;
560 560
561 ff_up->request_id = ff_up_compat.request_id; 561 ff_up->request_id = ff_up_compat.request_id;
562 ff_up->retval = ff_up_compat.retval; 562 ff_up->retval = ff_up_compat.retval;
563 memcpy(&ff_up->effect, &ff_up_compat.effect, 563 memcpy(&ff_up->effect, &ff_up_compat.effect,
564 sizeof(struct ff_effect_compat)); 564 sizeof(struct ff_effect_compat));
565 memcpy(&ff_up->old, &ff_up_compat.old, 565 memcpy(&ff_up->old, &ff_up_compat.old,
566 sizeof(struct ff_effect_compat)); 566 sizeof(struct ff_effect_compat));
567 567
568 } else { 568 } else {
569 if (copy_from_user(ff_up, buffer, 569 if (copy_from_user(ff_up, buffer,
570 sizeof(struct uinput_ff_upload))) 570 sizeof(struct uinput_ff_upload)))
571 return -EFAULT; 571 return -EFAULT;
572 } 572 }
573 573
574 return 0; 574 return 0;
575 } 575 }
576 576
577 #else 577 #else
578 578
579 static int uinput_ff_upload_to_user(char __user *buffer, 579 static int uinput_ff_upload_to_user(char __user *buffer,
580 const struct uinput_ff_upload *ff_up) 580 const struct uinput_ff_upload *ff_up)
581 { 581 {
582 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) 582 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
583 return -EFAULT; 583 return -EFAULT;
584 584
585 return 0; 585 return 0;
586 } 586 }
587 587
588 static int uinput_ff_upload_from_user(const char __user *buffer, 588 static int uinput_ff_upload_from_user(const char __user *buffer,
589 struct uinput_ff_upload *ff_up) 589 struct uinput_ff_upload *ff_up)
590 { 590 {
591 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) 591 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
592 return -EFAULT; 592 return -EFAULT;
593 593
594 return 0; 594 return 0;
595 } 595 }
596 596
597 #endif 597 #endif
598 598
599 #define uinput_set_bit(_arg, _bit, _max) \ 599 #define uinput_set_bit(_arg, _bit, _max) \
600 ({ \ 600 ({ \
601 int __ret = 0; \ 601 int __ret = 0; \
602 if (udev->state == UIST_CREATED) \ 602 if (udev->state == UIST_CREATED) \
603 __ret = -EINVAL; \ 603 __ret = -EINVAL; \
604 else if ((_arg) > (_max)) \ 604 else if ((_arg) > (_max)) \
605 __ret = -EINVAL; \ 605 __ret = -EINVAL; \
606 else set_bit((_arg), udev->dev->_bit); \ 606 else set_bit((_arg), udev->dev->_bit); \
607 __ret; \ 607 __ret; \
608 }) 608 })
609 609
610 static long uinput_ioctl_handler(struct file *file, unsigned int cmd, 610 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
611 unsigned long arg, void __user *p) 611 unsigned long arg, void __user *p)
612 { 612 {
613 int retval; 613 int retval;
614 struct uinput_device *udev = file->private_data; 614 struct uinput_device *udev = file->private_data;
615 struct uinput_ff_upload ff_up; 615 struct uinput_ff_upload ff_up;
616 struct uinput_ff_erase ff_erase; 616 struct uinput_ff_erase ff_erase;
617 struct uinput_request *req; 617 struct uinput_request *req;
618 int length; 618 int length;
619 char *phys; 619 char *phys;
620 620
621 retval = mutex_lock_interruptible(&udev->mutex); 621 retval = mutex_lock_interruptible(&udev->mutex);
622 if (retval) 622 if (retval)
623 return retval; 623 return retval;
624 624
625 if (!udev->dev) { 625 if (!udev->dev) {
626 retval = uinput_allocate_device(udev); 626 retval = uinput_allocate_device(udev);
627 if (retval) 627 if (retval)
628 goto out; 628 goto out;
629 } 629 }
630 630
631 switch (cmd) { 631 switch (cmd) {
632 case UI_DEV_CREATE: 632 case UI_DEV_CREATE:
633 retval = uinput_create_device(udev); 633 retval = uinput_create_device(udev);
634 break; 634 break;
635 635
636 case UI_DEV_DESTROY: 636 case UI_DEV_DESTROY:
637 uinput_destroy_device(udev); 637 uinput_destroy_device(udev);
638 break; 638 break;
639 639
640 case UI_SET_EVBIT: 640 case UI_SET_EVBIT:
641 retval = uinput_set_bit(arg, evbit, EV_MAX); 641 retval = uinput_set_bit(arg, evbit, EV_MAX);
642 break; 642 break;
643 643
644 case UI_SET_KEYBIT: 644 case UI_SET_KEYBIT:
645 retval = uinput_set_bit(arg, keybit, KEY_MAX); 645 retval = uinput_set_bit(arg, keybit, KEY_MAX);
646 break; 646 break;
647 647
648 case UI_SET_RELBIT: 648 case UI_SET_RELBIT:
649 retval = uinput_set_bit(arg, relbit, REL_MAX); 649 retval = uinput_set_bit(arg, relbit, REL_MAX);
650 break; 650 break;
651 651
652 case UI_SET_ABSBIT: 652 case UI_SET_ABSBIT:
653 retval = uinput_set_bit(arg, absbit, ABS_MAX); 653 retval = uinput_set_bit(arg, absbit, ABS_MAX);
654 break; 654 break;
655 655
656 case UI_SET_MSCBIT: 656 case UI_SET_MSCBIT:
657 retval = uinput_set_bit(arg, mscbit, MSC_MAX); 657 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
658 break; 658 break;
659 659
660 case UI_SET_LEDBIT: 660 case UI_SET_LEDBIT:
661 retval = uinput_set_bit(arg, ledbit, LED_MAX); 661 retval = uinput_set_bit(arg, ledbit, LED_MAX);
662 break; 662 break;
663 663
664 case UI_SET_SNDBIT: 664 case UI_SET_SNDBIT:
665 retval = uinput_set_bit(arg, sndbit, SND_MAX); 665 retval = uinput_set_bit(arg, sndbit, SND_MAX);
666 break; 666 break;
667 667
668 case UI_SET_FFBIT: 668 case UI_SET_FFBIT:
669 retval = uinput_set_bit(arg, ffbit, FF_MAX); 669 retval = uinput_set_bit(arg, ffbit, FF_MAX);
670 break; 670 break;
671 671
672 case UI_SET_SWBIT: 672 case UI_SET_SWBIT:
673 retval = uinput_set_bit(arg, swbit, SW_MAX); 673 retval = uinput_set_bit(arg, swbit, SW_MAX);
674 break; 674 break;
675 675
676 case UI_SET_PHYS: 676 case UI_SET_PHYS:
677 if (udev->state == UIST_CREATED) { 677 if (udev->state == UIST_CREATED) {
678 retval = -EINVAL; 678 retval = -EINVAL;
679 goto out; 679 goto out;
680 } 680 }
681 length = strnlen_user(p, 1024); 681 length = strnlen_user(p, 1024);
682 if (length <= 0) { 682 if (length <= 0) {
683 retval = -EFAULT; 683 retval = -EFAULT;
684 break; 684 break;
685 } 685 }
686 kfree(udev->dev->phys); 686 kfree(udev->dev->phys);
687 udev->dev->phys = phys = kmalloc(length, GFP_KERNEL); 687 udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
688 if (!phys) { 688 if (!phys) {
689 retval = -ENOMEM; 689 retval = -ENOMEM;
690 break; 690 break;
691 } 691 }
692 if (copy_from_user(phys, p, length)) { 692 if (copy_from_user(phys, p, length)) {
693 udev->dev->phys = NULL; 693 udev->dev->phys = NULL;
694 kfree(phys); 694 kfree(phys);
695 retval = -EFAULT; 695 retval = -EFAULT;
696 break; 696 break;
697 } 697 }
698 phys[length - 1] = '\0'; 698 phys[length - 1] = '\0';
699 break; 699 break;
700 700
701 case UI_BEGIN_FF_UPLOAD: 701 case UI_BEGIN_FF_UPLOAD:
702 retval = uinput_ff_upload_from_user(p, &ff_up); 702 retval = uinput_ff_upload_from_user(p, &ff_up);
703 if (retval) 703 if (retval)
704 break; 704 break;
705 705
706 req = uinput_request_find(udev, ff_up.request_id); 706 req = uinput_request_find(udev, ff_up.request_id);
707 if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) { 707 if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) {
708 retval = -EINVAL; 708 retval = -EINVAL;
709 break; 709 break;
710 } 710 }
711 711
712 ff_up.retval = 0; 712 ff_up.retval = 0;
713 ff_up.effect = *req->u.upload.effect; 713 ff_up.effect = *req->u.upload.effect;
714 if (req->u.upload.old) 714 if (req->u.upload.old)
715 ff_up.old = *req->u.upload.old; 715 ff_up.old = *req->u.upload.old;
716 else 716 else
717 memset(&ff_up.old, 0, sizeof(struct ff_effect)); 717 memset(&ff_up.old, 0, sizeof(struct ff_effect));
718 718
719 retval = uinput_ff_upload_to_user(p, &ff_up); 719 retval = uinput_ff_upload_to_user(p, &ff_up);
720 break; 720 break;
721 721
722 case UI_BEGIN_FF_ERASE: 722 case UI_BEGIN_FF_ERASE:
723 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 723 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
724 retval = -EFAULT; 724 retval = -EFAULT;
725 break; 725 break;
726 } 726 }
727 727
728 req = uinput_request_find(udev, ff_erase.request_id); 728 req = uinput_request_find(udev, ff_erase.request_id);
729 if (!req || req->code != UI_FF_ERASE) { 729 if (!req || req->code != UI_FF_ERASE) {
730 retval = -EINVAL; 730 retval = -EINVAL;
731 break; 731 break;
732 } 732 }
733 733
734 ff_erase.retval = 0; 734 ff_erase.retval = 0;
735 ff_erase.effect_id = req->u.effect_id; 735 ff_erase.effect_id = req->u.effect_id;
736 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { 736 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
737 retval = -EFAULT; 737 retval = -EFAULT;
738 break; 738 break;
739 } 739 }
740 740
741 break; 741 break;
742 742
743 case UI_END_FF_UPLOAD: 743 case UI_END_FF_UPLOAD:
744 retval = uinput_ff_upload_from_user(p, &ff_up); 744 retval = uinput_ff_upload_from_user(p, &ff_up);
745 if (retval) 745 if (retval)
746 break; 746 break;
747 747
748 req = uinput_request_find(udev, ff_up.request_id); 748 req = uinput_request_find(udev, ff_up.request_id);
749 if (!req || req->code != UI_FF_UPLOAD || 749 if (!req || req->code != UI_FF_UPLOAD ||
750 !req->u.upload.effect) { 750 !req->u.upload.effect) {
751 retval = -EINVAL; 751 retval = -EINVAL;
752 break; 752 break;
753 } 753 }
754 754
755 req->retval = ff_up.retval; 755 req->retval = ff_up.retval;
756 uinput_request_done(udev, req); 756 uinput_request_done(udev, req);
757 break; 757 break;
758 758
759 case UI_END_FF_ERASE: 759 case UI_END_FF_ERASE:
760 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { 760 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
761 retval = -EFAULT; 761 retval = -EFAULT;
762 break; 762 break;
763 } 763 }
764 764
765 req = uinput_request_find(udev, ff_erase.request_id); 765 req = uinput_request_find(udev, ff_erase.request_id);
766 if (!req || req->code != UI_FF_ERASE) { 766 if (!req || req->code != UI_FF_ERASE) {
767 retval = -EINVAL; 767 retval = -EINVAL;
768 break; 768 break;
769 } 769 }
770 770
771 req->retval = ff_erase.retval; 771 req->retval = ff_erase.retval;
772 uinput_request_done(udev, req); 772 uinput_request_done(udev, req);
773 break; 773 break;
774 774
775 default: 775 default:
776 retval = -EINVAL; 776 retval = -EINVAL;
777 } 777 }
778 778
779 out: 779 out:
780 mutex_unlock(&udev->mutex); 780 mutex_unlock(&udev->mutex);
781 return retval; 781 return retval;
782 } 782 }
783 783
784 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 784 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
785 { 785 {
786 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); 786 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
787 } 787 }
788 788
789 #ifdef CONFIG_COMPAT 789 #ifdef CONFIG_COMPAT
790 static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 790 static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
791 { 791 {
792 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); 792 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
793 } 793 }
794 #endif 794 #endif
795 795
796 static const struct file_operations uinput_fops = { 796 static const struct file_operations uinput_fops = {
797 .owner = THIS_MODULE, 797 .owner = THIS_MODULE,
798 .open = uinput_open, 798 .open = uinput_open,
799 .release = uinput_release, 799 .release = uinput_release,
800 .read = uinput_read, 800 .read = uinput_read,
801 .write = uinput_write, 801 .write = uinput_write,
802 .poll = uinput_poll, 802 .poll = uinput_poll,
803 .unlocked_ioctl = uinput_ioctl, 803 .unlocked_ioctl = uinput_ioctl,
804 #ifdef CONFIG_COMPAT 804 #ifdef CONFIG_COMPAT
805 .compat_ioctl = uinput_compat_ioctl, 805 .compat_ioctl = uinput_compat_ioctl,
806 #endif 806 #endif
807 }; 807 };
808 808
809 static struct miscdevice uinput_misc = { 809 static struct miscdevice uinput_misc = {
810 .fops = &uinput_fops, 810 .fops = &uinput_fops,
811 .minor = UINPUT_MINOR, 811 .minor = UINPUT_MINOR,
812 .name = UINPUT_NAME, 812 .name = UINPUT_NAME,
813 }; 813 };
814 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
815 MODULE_ALIAS("devname:" UINPUT_NAME);
814 816
815 static int __init uinput_init(void) 817 static int __init uinput_init(void)
816 { 818 {
817 return misc_register(&uinput_misc); 819 return misc_register(&uinput_misc);
818 } 820 }
819 821
820 static void __exit uinput_exit(void) 822 static void __exit uinput_exit(void)
821 { 823 {
822 misc_deregister(&uinput_misc); 824 misc_deregister(&uinput_misc);
823 } 825 }
824 826
825 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); 827 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
826 MODULE_DESCRIPTION("User level driver support for input subsystem"); 828 MODULE_DESCRIPTION("User level driver support for input subsystem");
827 MODULE_LICENSE("GPL"); 829 MODULE_LICENSE("GPL");
828 MODULE_VERSION("0.3"); 830 MODULE_VERSION("0.3");
829 831
830 module_init(uinput_init); 832 module_init(uinput_init);
831 module_exit(uinput_exit); 833 module_exit(uinput_exit);
832 834
833 835
include/linux/miscdevice.h
1 #ifndef _LINUX_MISCDEVICE_H 1 #ifndef _LINUX_MISCDEVICE_H
2 #define _LINUX_MISCDEVICE_H 2 #define _LINUX_MISCDEVICE_H
3 #include <linux/module.h> 3 #include <linux/module.h>
4 #include <linux/major.h> 4 #include <linux/major.h>
5 5
6 /* 6 /*
7 * These allocations are managed by device@lanana.org. If you use an 7 * These allocations are managed by device@lanana.org. If you use an
8 * entry that is not in assigned your entry may well be moved and 8 * entry that is not in assigned your entry may well be moved and
9 * reassigned, or set dynamic if a fixed value is not justified. 9 * reassigned, or set dynamic if a fixed value is not justified.
10 */ 10 */
11 11
12 #define PSMOUSE_MINOR 1 12 #define PSMOUSE_MINOR 1
13 #define MS_BUSMOUSE_MINOR 2 13 #define MS_BUSMOUSE_MINOR 2
14 #define ATIXL_BUSMOUSE_MINOR 3 14 #define ATIXL_BUSMOUSE_MINOR 3
15 /*#define AMIGAMOUSE_MINOR 4 FIXME OBSOLETE */ 15 /*#define AMIGAMOUSE_MINOR 4 FIXME OBSOLETE */
16 #define ATARIMOUSE_MINOR 5 16 #define ATARIMOUSE_MINOR 5
17 #define SUN_MOUSE_MINOR 6 17 #define SUN_MOUSE_MINOR 6
18 #define APOLLO_MOUSE_MINOR 7 18 #define APOLLO_MOUSE_MINOR 7
19 #define PC110PAD_MINOR 9 19 #define PC110PAD_MINOR 9
20 /*#define ADB_MOUSE_MINOR 10 FIXME OBSOLETE */ 20 /*#define ADB_MOUSE_MINOR 10 FIXME OBSOLETE */
21 #define WATCHDOG_MINOR 130 /* Watchdog timer */ 21 #define WATCHDOG_MINOR 130 /* Watchdog timer */
22 #define TEMP_MINOR 131 /* Temperature Sensor */ 22 #define TEMP_MINOR 131 /* Temperature Sensor */
23 #define RTC_MINOR 135 23 #define RTC_MINOR 135
24 #define EFI_RTC_MINOR 136 /* EFI Time services */ 24 #define EFI_RTC_MINOR 136 /* EFI Time services */
25 #define SUN_OPENPROM_MINOR 139 25 #define SUN_OPENPROM_MINOR 139
26 #define DMAPI_MINOR 140 /* DMAPI */ 26 #define DMAPI_MINOR 140 /* DMAPI */
27 #define NVRAM_MINOR 144 27 #define NVRAM_MINOR 144
28 #define SGI_MMTIMER 153 28 #define SGI_MMTIMER 153
29 #define STORE_QUEUE_MINOR 155 29 #define STORE_QUEUE_MINOR 155
30 #define I2O_MINOR 166 30 #define I2O_MINOR 166
31 #define MICROCODE_MINOR 184 31 #define MICROCODE_MINOR 184
32 #define TUN_MINOR 200 32 #define TUN_MINOR 200
33 #define MWAVE_MINOR 219 /* ACP/Mwave Modem */ 33 #define MWAVE_MINOR 219 /* ACP/Mwave Modem */
34 #define MPT_MINOR 220 34 #define MPT_MINOR 220
35 #define MPT2SAS_MINOR 221 35 #define MPT2SAS_MINOR 221
36 #define UINPUT_MINOR 223
36 #define HPET_MINOR 228 37 #define HPET_MINOR 228
37 #define FUSE_MINOR 229 38 #define FUSE_MINOR 229
38 #define KVM_MINOR 232 39 #define KVM_MINOR 232
39 #define BTRFS_MINOR 234 40 #define BTRFS_MINOR 234
40 #define AUTOFS_MINOR 235 41 #define AUTOFS_MINOR 235
41 #define MAPPER_CTRL_MINOR 236 42 #define MAPPER_CTRL_MINOR 236
42 #define MISC_DYNAMIC_MINOR 255 43 #define MISC_DYNAMIC_MINOR 255
43 44
44 struct device; 45 struct device;
45 46
46 struct miscdevice { 47 struct miscdevice {
47 int minor; 48 int minor;
48 const char *name; 49 const char *name;
49 const struct file_operations *fops; 50 const struct file_operations *fops;
50 struct list_head list; 51 struct list_head list;
51 struct device *parent; 52 struct device *parent;
52 struct device *this_device; 53 struct device *this_device;
53 const char *nodename; 54 const char *nodename;
54 mode_t mode; 55 mode_t mode;
55 }; 56 };
56 57
57 extern int misc_register(struct miscdevice * misc); 58 extern int misc_register(struct miscdevice * misc);
58 extern int misc_deregister(struct miscdevice *misc); 59 extern int misc_deregister(struct miscdevice *misc);
59 60
60 #define MODULE_ALIAS_MISCDEV(minor) \ 61 #define MODULE_ALIAS_MISCDEV(minor) \
61 MODULE_ALIAS("char-major-" __stringify(MISC_MAJOR) \ 62 MODULE_ALIAS("char-major-" __stringify(MISC_MAJOR) \
62 "-" __stringify(minor)) 63 "-" __stringify(minor))
63 #endif 64 #endif
64 65
include/linux/uinput.h
1 #ifndef __UINPUT_H_ 1 #ifndef __UINPUT_H_
2 #define __UINPUT_H_ 2 #define __UINPUT_H_
3 /* 3 /*
4 * User level driver support for input subsystem 4 * User level driver support for input subsystem
5 * 5 *
6 * Heavily based on evdev.c by Vojtech Pavlik 6 * Heavily based on evdev.c by Vojtech Pavlik
7 * 7 *
8 * This program is free software; you can redistribute it and/or modify 8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by 9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or 10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 11 * (at your option) any later version.
12 * 12 *
13 * This program is distributed in the hope that it will be useful, 13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details. 16 * GNU General Public License for more details.
17 * 17 *
18 * You should have received a copy of the GNU General Public License 18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software 19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * 21 *
22 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> 22 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
23 * 23 *
24 * Changes/Revisions: 24 * Changes/Revisions:
25 * 0.3 24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>) 25 * 0.3 24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>)
26 * - update ff support for the changes in kernel interface 26 * - update ff support for the changes in kernel interface
27 * - add UINPUT_VERSION 27 * - add UINPUT_VERSION
28 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) 28 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
29 * - added force feedback support 29 * - added force feedback support
30 * - added UI_SET_PHYS 30 * - added UI_SET_PHYS
31 * 0.1 20/06/2002 31 * 0.1 20/06/2002
32 * - first public version 32 * - first public version
33 */ 33 */
34 34
35 #include <linux/input.h> 35 #include <linux/input.h>
36 36
37 #define UINPUT_VERSION 3 37 #define UINPUT_VERSION 3
38 38
39 #ifdef __KERNEL__ 39 #ifdef __KERNEL__
40 #define UINPUT_MINOR 223
41 #define UINPUT_NAME "uinput" 40 #define UINPUT_NAME "uinput"
42 #define UINPUT_BUFFER_SIZE 16 41 #define UINPUT_BUFFER_SIZE 16
43 #define UINPUT_NUM_REQUESTS 16 42 #define UINPUT_NUM_REQUESTS 16
44 43
45 enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED }; 44 enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
46 45
47 struct uinput_request { 46 struct uinput_request {
48 int id; 47 int id;
49 int code; /* UI_FF_UPLOAD, UI_FF_ERASE */ 48 int code; /* UI_FF_UPLOAD, UI_FF_ERASE */
50 49
51 int retval; 50 int retval;
52 struct completion done; 51 struct completion done;
53 52
54 union { 53 union {
55 int effect_id; 54 int effect_id;
56 struct { 55 struct {
57 struct ff_effect *effect; 56 struct ff_effect *effect;
58 struct ff_effect *old; 57 struct ff_effect *old;
59 } upload; 58 } upload;
60 } u; 59 } u;
61 }; 60 };
62 61
63 struct uinput_device { 62 struct uinput_device {
64 struct input_dev *dev; 63 struct input_dev *dev;
65 struct mutex mutex; 64 struct mutex mutex;
66 enum uinput_state state; 65 enum uinput_state state;
67 wait_queue_head_t waitq; 66 wait_queue_head_t waitq;
68 unsigned char ready; 67 unsigned char ready;
69 unsigned char head; 68 unsigned char head;
70 unsigned char tail; 69 unsigned char tail;
71 struct input_event buff[UINPUT_BUFFER_SIZE]; 70 struct input_event buff[UINPUT_BUFFER_SIZE];
72 int ff_effects_max; 71 int ff_effects_max;
73 72
74 struct uinput_request *requests[UINPUT_NUM_REQUESTS]; 73 struct uinput_request *requests[UINPUT_NUM_REQUESTS];
75 wait_queue_head_t requests_waitq; 74 wait_queue_head_t requests_waitq;
76 spinlock_t requests_lock; 75 spinlock_t requests_lock;
77 }; 76 };
78 #endif /* __KERNEL__ */ 77 #endif /* __KERNEL__ */
79 78
80 struct uinput_ff_upload { 79 struct uinput_ff_upload {
81 int request_id; 80 int request_id;
82 int retval; 81 int retval;
83 struct ff_effect effect; 82 struct ff_effect effect;
84 struct ff_effect old; 83 struct ff_effect old;
85 }; 84 };
86 85
87 struct uinput_ff_erase { 86 struct uinput_ff_erase {
88 int request_id; 87 int request_id;
89 int retval; 88 int retval;
90 int effect_id; 89 int effect_id;
91 }; 90 };
92 91
93 /* ioctl */ 92 /* ioctl */
94 #define UINPUT_IOCTL_BASE 'U' 93 #define UINPUT_IOCTL_BASE 'U'
95 #define UI_DEV_CREATE _IO(UINPUT_IOCTL_BASE, 1) 94 #define UI_DEV_CREATE _IO(UINPUT_IOCTL_BASE, 1)
96 #define UI_DEV_DESTROY _IO(UINPUT_IOCTL_BASE, 2) 95 #define UI_DEV_DESTROY _IO(UINPUT_IOCTL_BASE, 2)
97 96
98 #define UI_SET_EVBIT _IOW(UINPUT_IOCTL_BASE, 100, int) 97 #define UI_SET_EVBIT _IOW(UINPUT_IOCTL_BASE, 100, int)
99 #define UI_SET_KEYBIT _IOW(UINPUT_IOCTL_BASE, 101, int) 98 #define UI_SET_KEYBIT _IOW(UINPUT_IOCTL_BASE, 101, int)
100 #define UI_SET_RELBIT _IOW(UINPUT_IOCTL_BASE, 102, int) 99 #define UI_SET_RELBIT _IOW(UINPUT_IOCTL_BASE, 102, int)
101 #define UI_SET_ABSBIT _IOW(UINPUT_IOCTL_BASE, 103, int) 100 #define UI_SET_ABSBIT _IOW(UINPUT_IOCTL_BASE, 103, int)
102 #define UI_SET_MSCBIT _IOW(UINPUT_IOCTL_BASE, 104, int) 101 #define UI_SET_MSCBIT _IOW(UINPUT_IOCTL_BASE, 104, int)
103 #define UI_SET_LEDBIT _IOW(UINPUT_IOCTL_BASE, 105, int) 102 #define UI_SET_LEDBIT _IOW(UINPUT_IOCTL_BASE, 105, int)
104 #define UI_SET_SNDBIT _IOW(UINPUT_IOCTL_BASE, 106, int) 103 #define UI_SET_SNDBIT _IOW(UINPUT_IOCTL_BASE, 106, int)
105 #define UI_SET_FFBIT _IOW(UINPUT_IOCTL_BASE, 107, int) 104 #define UI_SET_FFBIT _IOW(UINPUT_IOCTL_BASE, 107, int)
106 #define UI_SET_PHYS _IOW(UINPUT_IOCTL_BASE, 108, char*) 105 #define UI_SET_PHYS _IOW(UINPUT_IOCTL_BASE, 108, char*)
107 #define UI_SET_SWBIT _IOW(UINPUT_IOCTL_BASE, 109, int) 106 #define UI_SET_SWBIT _IOW(UINPUT_IOCTL_BASE, 109, int)
108 107
109 #define UI_BEGIN_FF_UPLOAD _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload) 108 #define UI_BEGIN_FF_UPLOAD _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload)
110 #define UI_END_FF_UPLOAD _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload) 109 #define UI_END_FF_UPLOAD _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload)
111 #define UI_BEGIN_FF_ERASE _IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase) 110 #define UI_BEGIN_FF_ERASE _IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase)
112 #define UI_END_FF_ERASE _IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase) 111 #define UI_END_FF_ERASE _IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase)
113 112
114 /* 113 /*
115 * To write a force-feedback-capable driver, the upload_effect 114 * To write a force-feedback-capable driver, the upload_effect
116 * and erase_effect callbacks in input_dev must be implemented. 115 * and erase_effect callbacks in input_dev must be implemented.
117 * The uinput driver will generate a fake input event when one of 116 * The uinput driver will generate a fake input event when one of
118 * these callbacks are invoked. The userspace code then uses 117 * these callbacks are invoked. The userspace code then uses
119 * ioctls to retrieve additional parameters and send the return code. 118 * ioctls to retrieve additional parameters and send the return code.
120 * The callback blocks until this return code is sent. 119 * The callback blocks until this return code is sent.
121 * 120 *
122 * The described callback mechanism is only used if ff_effects_max 121 * The described callback mechanism is only used if ff_effects_max
123 * is set. 122 * is set.
124 * 123 *
125 * To implement upload_effect(): 124 * To implement upload_effect():
126 * 1. Wait for an event with type == EV_UINPUT and code == UI_FF_UPLOAD. 125 * 1. Wait for an event with type == EV_UINPUT and code == UI_FF_UPLOAD.
127 * A request ID will be given in 'value'. 126 * A request ID will be given in 'value'.
128 * 2. Allocate a uinput_ff_upload struct, fill in request_id with 127 * 2. Allocate a uinput_ff_upload struct, fill in request_id with
129 * the 'value' from the EV_UINPUT event. 128 * the 'value' from the EV_UINPUT event.
130 * 3. Issue a UI_BEGIN_FF_UPLOAD ioctl, giving it the 129 * 3. Issue a UI_BEGIN_FF_UPLOAD ioctl, giving it the
131 * uinput_ff_upload struct. It will be filled in with the 130 * uinput_ff_upload struct. It will be filled in with the
132 * ff_effects passed to upload_effect(). 131 * ff_effects passed to upload_effect().
133 * 4. Perform the effect upload, and place a return code back into 132 * 4. Perform the effect upload, and place a return code back into
134 the uinput_ff_upload struct. 133 the uinput_ff_upload struct.
135 * 5. Issue a UI_END_FF_UPLOAD ioctl, also giving it the 134 * 5. Issue a UI_END_FF_UPLOAD ioctl, also giving it the
136 * uinput_ff_upload_effect struct. This will complete execution 135 * uinput_ff_upload_effect struct. This will complete execution
137 * of our upload_effect() handler. 136 * of our upload_effect() handler.
138 * 137 *
139 * To implement erase_effect(): 138 * To implement erase_effect():
140 * 1. Wait for an event with type == EV_UINPUT and code == UI_FF_ERASE. 139 * 1. Wait for an event with type == EV_UINPUT and code == UI_FF_ERASE.
141 * A request ID will be given in 'value'. 140 * A request ID will be given in 'value'.
142 * 2. Allocate a uinput_ff_erase struct, fill in request_id with 141 * 2. Allocate a uinput_ff_erase struct, fill in request_id with
143 * the 'value' from the EV_UINPUT event. 142 * the 'value' from the EV_UINPUT event.
144 * 3. Issue a UI_BEGIN_FF_ERASE ioctl, giving it the 143 * 3. Issue a UI_BEGIN_FF_ERASE ioctl, giving it the
145 * uinput_ff_erase struct. It will be filled in with the 144 * uinput_ff_erase struct. It will be filled in with the
146 * effect ID passed to erase_effect(). 145 * effect ID passed to erase_effect().
147 * 4. Perform the effect erasure, and place a return code back 146 * 4. Perform the effect erasure, and place a return code back
148 * into the uinput_ff_erase struct. 147 * into the uinput_ff_erase struct.
149 * 5. Issue a UI_END_FF_ERASE ioctl, also giving it the 148 * 5. Issue a UI_END_FF_ERASE ioctl, also giving it the
150 * uinput_ff_erase_effect struct. This will complete execution 149 * uinput_ff_erase_effect struct. This will complete execution
151 * of our erase_effect() handler. 150 * of our erase_effect() handler.
152 */ 151 */
153 152
154 /* 153 /*
155 * This is the new event type, used only by uinput. 154 * This is the new event type, used only by uinput.
156 * 'code' is UI_FF_UPLOAD or UI_FF_ERASE, and 'value' 155 * 'code' is UI_FF_UPLOAD or UI_FF_ERASE, and 'value'
157 * is the unique request ID. This number was picked 156 * is the unique request ID. This number was picked
158 * arbitrarily, above EV_MAX (since the input system 157 * arbitrarily, above EV_MAX (since the input system
159 * never sees it) but in the range of a 16-bit int. 158 * never sees it) but in the range of a 16-bit int.
160 */ 159 */
161 #define EV_UINPUT 0x0101 160 #define EV_UINPUT 0x0101
162 #define UI_FF_UPLOAD 1 161 #define UI_FF_UPLOAD 1
163 #define UI_FF_ERASE 2 162 #define UI_FF_ERASE 2
164 163
165 #define UINPUT_MAX_NAME_SIZE 80 164 #define UINPUT_MAX_NAME_SIZE 80
166 struct uinput_user_dev { 165 struct uinput_user_dev {
167 char name[UINPUT_MAX_NAME_SIZE]; 166 char name[UINPUT_MAX_NAME_SIZE];
168 struct input_id id; 167 struct input_id id;
169 int ff_effects_max; 168 int ff_effects_max;
170 int absmax[ABS_CNT]; 169 int absmax[ABS_CNT];
171 int absmin[ABS_CNT]; 170 int absmin[ABS_CNT];
172 int absfuzz[ABS_CNT]; 171 int absfuzz[ABS_CNT];
173 int absflat[ABS_CNT]; 172 int absflat[ABS_CNT];
174 }; 173 };
175 #endif /* __UINPUT_H_ */ 174 #endif /* __UINPUT_H_ */
176 175
177 176