Thomas Gleixner | 1a59d1b8 | 2019-05-27 08:55:05 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * User level driver support for input subsystem |
| 4 | * |
| 5 | * Heavily based on evdev.c by Vojtech Pavlik |
| 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> |
| 8 | * |
| 9 | * Changes/Revisions: |
Benjamin Tissoires | e3480a6 | 2014-01-30 17:20:24 -0800 | [diff] [blame] | 10 | * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>) |
| 11 | * - add UI_GET_SYSNAME ioctl |
Anssi Hannula | ff46255 | 2006-07-19 01:41:09 -0400 | [diff] [blame] | 12 | * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>) |
| 13 | * - updated ff support for the changes in kernel interface |
| 14 | * - added MODULE_VERSION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) |
| 16 | * - added force feedback support |
| 17 | * - added UI_SET_PHYS |
| 18 | * 0.1 20/06/2002 |
| 19 | * - first public version |
| 20 | */ |
Dmitry Torokhov | a11bc476 | 2017-09-04 12:19:07 -0700 | [diff] [blame] | 21 | #include <uapi/linux/uinput.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/poll.h> |
Alexey Dobriyan | a99bbaf | 2009-10-04 16:11:37 +0400 | [diff] [blame] | 23 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/slab.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/fs.h> |
| 28 | #include <linux/miscdevice.h> |
Dmitry Torokhov | d77651a | 2019-01-14 13:54:55 -0800 | [diff] [blame] | 29 | #include <linux/overflow.h> |
Henrik Rydberg | 47c78e8 | 2010-11-27 09:16:48 +0100 | [diff] [blame] | 30 | #include <linux/input/mt.h> |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 31 | #include "../input-compat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Dmitry Torokhov | a11bc476 | 2017-09-04 12:19:07 -0700 | [diff] [blame] | 33 | #define UINPUT_NAME "uinput" |
| 34 | #define UINPUT_BUFFER_SIZE 16 |
| 35 | #define UINPUT_NUM_REQUESTS 16 |
| 36 | |
| 37 | enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED }; |
| 38 | |
| 39 | struct uinput_request { |
| 40 | unsigned int id; |
| 41 | unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */ |
| 42 | |
| 43 | int retval; |
| 44 | struct completion done; |
| 45 | |
| 46 | union { |
| 47 | unsigned int effect_id; |
| 48 | struct { |
| 49 | struct ff_effect *effect; |
| 50 | struct ff_effect *old; |
| 51 | } upload; |
| 52 | } u; |
| 53 | }; |
| 54 | |
| 55 | struct uinput_device { |
| 56 | struct input_dev *dev; |
| 57 | struct mutex mutex; |
| 58 | enum uinput_state state; |
| 59 | wait_queue_head_t waitq; |
| 60 | unsigned char ready; |
| 61 | unsigned char head; |
| 62 | unsigned char tail; |
| 63 | struct input_event buff[UINPUT_BUFFER_SIZE]; |
| 64 | unsigned int ff_effects_max; |
| 65 | |
| 66 | struct uinput_request *requests[UINPUT_NUM_REQUESTS]; |
| 67 | wait_queue_head_t requests_waitq; |
| 68 | spinlock_t requests_lock; |
| 69 | }; |
| 70 | |
Dmitry Torokhov | 54ce165 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 71 | static int uinput_dev_event(struct input_dev *dev, |
| 72 | unsigned int type, unsigned int code, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | { |
Dmitry Torokhov | 373f971 | 2007-04-12 01:34:33 -0400 | [diff] [blame] | 74 | struct uinput_device *udev = input_get_drvdata(dev); |
Deepa Dinamani | b3495cec | 2018-01-01 22:27:11 -0800 | [diff] [blame] | 75 | struct timespec64 ts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | udev->buff[udev->head].type = type; |
| 78 | udev->buff[udev->head].code = code; |
| 79 | udev->buff[udev->head].value = value; |
Deepa Dinamani | b3495cec | 2018-01-01 22:27:11 -0800 | [diff] [blame] | 80 | ktime_get_ts64(&ts); |
Deepa Dinamani | 152194f | 2018-01-07 17:44:42 -0800 | [diff] [blame] | 81 | udev->buff[udev->head].input_event_sec = ts.tv_sec; |
| 82 | udev->buff[udev->head].input_event_usec = ts.tv_nsec / NSEC_PER_USEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; |
| 84 | |
| 85 | wake_up_interruptible(&udev->waitq); |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 90 | /* Atomically allocate an ID for the given request. Returns 0 on success. */ |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 91 | static bool uinput_request_alloc_id(struct uinput_device *udev, |
| 92 | struct uinput_request *request) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Dmitry Torokhov | c5b3533 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 94 | unsigned int id; |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 95 | bool reserved = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 97 | spin_lock(&udev->requests_lock); |
Dmitry Torokhov | 152c12f | 2005-06-30 00:47:50 -0500 | [diff] [blame] | 98 | |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 99 | for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | if (!udev->requests[id]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | request->id = id; |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 102 | udev->requests[id] = request; |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 103 | reserved = true; |
Dmitry Torokhov | 152c12f | 2005-06-30 00:47:50 -0500 | [diff] [blame] | 104 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 106 | } |
Dmitry Torokhov | 152c12f | 2005-06-30 00:47:50 -0500 | [diff] [blame] | 107 | |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 108 | spin_unlock(&udev->requests_lock); |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 109 | return reserved; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
| 111 | |
Dmitry Torokhov | c5b3533 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 112 | static struct uinput_request *uinput_request_find(struct uinput_device *udev, |
| 113 | unsigned int id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
| 115 | /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ |
Dmitry Torokhov | c5b3533 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 116 | if (id >= UINPUT_NUM_REQUESTS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | return NULL; |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | return udev->requests[id]; |
| 120 | } |
| 121 | |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 122 | static int uinput_request_reserve_slot(struct uinput_device *udev, |
| 123 | struct uinput_request *request) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 125 | /* Allocate slot. If none are available right away, wait. */ |
| 126 | return wait_event_interruptible(udev->requests_waitq, |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 127 | uinput_request_alloc_id(udev, request)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | } |
| 129 | |
Dmitry Torokhov | 6b4877c7 | 2017-09-06 16:22:59 -0700 | [diff] [blame] | 130 | static void uinput_request_release_slot(struct uinput_device *udev, |
| 131 | unsigned int id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 133 | /* Mark slot as available */ |
Dmitry Torokhov | 6b4877c7 | 2017-09-06 16:22:59 -0700 | [diff] [blame] | 134 | spin_lock(&udev->requests_lock); |
| 135 | udev->requests[id] = NULL; |
| 136 | spin_unlock(&udev->requests_lock); |
Dmitry Torokhov | e7507ed | 2005-10-17 16:43:32 -0700 | [diff] [blame] | 137 | |
Dmitry Torokhov | 6b4877c7 | 2017-09-06 16:22:59 -0700 | [diff] [blame] | 138 | wake_up(&udev->requests_waitq); |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 139 | } |
| 140 | |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 141 | static int uinput_request_send(struct uinput_device *udev, |
| 142 | struct uinput_request *request) |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 143 | { |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 144 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 146 | retval = mutex_lock_interruptible(&udev->mutex); |
| 147 | if (retval) |
| 148 | return retval; |
| 149 | |
| 150 | if (udev->state != UIST_CREATED) { |
| 151 | retval = -ENODEV; |
| 152 | goto out; |
| 153 | } |
| 154 | |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 155 | init_completion(&request->done); |
| 156 | |
| 157 | /* |
| 158 | * Tell our userspace application about this new request |
| 159 | * by queueing an input event. |
| 160 | */ |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 161 | uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); |
| 162 | |
| 163 | out: |
| 164 | mutex_unlock(&udev->mutex); |
| 165 | return retval; |
| 166 | } |
| 167 | |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 168 | static int uinput_request_submit(struct uinput_device *udev, |
| 169 | struct uinput_request *request) |
| 170 | { |
Dmitry Torokhov | 6b4877c7 | 2017-09-06 16:22:59 -0700 | [diff] [blame] | 171 | int retval; |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 172 | |
Dmitry Torokhov | 6b4877c7 | 2017-09-06 16:22:59 -0700 | [diff] [blame] | 173 | retval = uinput_request_reserve_slot(udev, request); |
| 174 | if (retval) |
| 175 | return retval; |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 176 | |
Dmitry Torokhov | 6b4877c7 | 2017-09-06 16:22:59 -0700 | [diff] [blame] | 177 | retval = uinput_request_send(udev, request); |
| 178 | if (retval) |
| 179 | goto out; |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 180 | |
Dmitry Torokhov | 8e00911 | 2017-09-06 16:31:29 -0700 | [diff] [blame] | 181 | if (!wait_for_completion_timeout(&request->done, 30 * HZ)) { |
| 182 | retval = -ETIMEDOUT; |
| 183 | goto out; |
| 184 | } |
| 185 | |
Dmitry Torokhov | 6b4877c7 | 2017-09-06 16:22:59 -0700 | [diff] [blame] | 186 | retval = request->retval; |
| 187 | |
| 188 | out: |
| 189 | uinput_request_release_slot(udev, request->id); |
| 190 | return retval; |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 193 | /* |
Dmitry Torokhov | 54ce165 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 194 | * Fail all outstanding requests so handlers don't wait for the userspace |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 195 | * to finish processing them. |
| 196 | */ |
| 197 | static void uinput_flush_requests(struct uinput_device *udev) |
| 198 | { |
| 199 | struct uinput_request *request; |
| 200 | int i; |
| 201 | |
| 202 | spin_lock(&udev->requests_lock); |
| 203 | |
| 204 | for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { |
| 205 | request = udev->requests[i]; |
| 206 | if (request) { |
| 207 | request->retval = -ENODEV; |
Dmitry Torokhov | 6b4877c7 | 2017-09-06 16:22:59 -0700 | [diff] [blame] | 208 | complete(&request->done); |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 209 | } |
| 210 | } |
| 211 | |
| 212 | spin_unlock(&udev->requests_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
Anssi Hannula | ff46255 | 2006-07-19 01:41:09 -0400 | [diff] [blame] | 215 | static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) |
| 216 | { |
| 217 | uinput_dev_event(dev, EV_FF, FF_GAIN, gain); |
| 218 | } |
| 219 | |
| 220 | static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) |
| 221 | { |
| 222 | uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); |
| 223 | } |
| 224 | |
| 225 | static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) |
| 226 | { |
| 227 | return uinput_dev_event(dev, EV_FF, effect_id, value); |
| 228 | } |
| 229 | |
Dmitry Torokhov | 54ce165 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 230 | static int uinput_dev_upload_effect(struct input_dev *dev, |
| 231 | struct ff_effect *effect, |
| 232 | struct ff_effect *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 234 | struct uinput_device *udev = input_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | struct uinput_request request; |
| 236 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 237 | /* |
| 238 | * uinput driver does not currently support periodic effects with |
| 239 | * custom waveform since it does not have a way to pass buffer of |
| 240 | * samples (custom_data) to userspace. If ever there is a device |
| 241 | * supporting custom waveforms we would need to define an additional |
| 242 | * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. |
| 243 | */ |
| 244 | if (effect->type == FF_PERIODIC && |
| 245 | effect->u.periodic.waveform == FF_CUSTOM) |
| 246 | return -EINVAL; |
| 247 | |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 248 | request.code = UI_FF_UPLOAD; |
Anssi Hannula | ff46255 | 2006-07-19 01:41:09 -0400 | [diff] [blame] | 249 | request.u.upload.effect = effect; |
| 250 | request.u.upload.old = old; |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 251 | |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 252 | return uinput_request_submit(udev, &request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) |
| 256 | { |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 257 | struct uinput_device *udev = input_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | struct uinput_request request; |
| 259 | |
| 260 | if (!test_bit(EV_FF, dev->evbit)) |
| 261 | return -ENOSYS; |
| 262 | |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 263 | request.code = UI_FF_ERASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | request.u.effect_id = effect_id; |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 265 | |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 266 | return uinput_request_submit(udev, &request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
| 268 | |
Dmitry Torokhov | e8b9572 | 2017-09-01 17:13:43 -0700 | [diff] [blame] | 269 | static int uinput_dev_flush(struct input_dev *dev, struct file *file) |
| 270 | { |
| 271 | /* |
| 272 | * If we are called with file == NULL that means we are tearing |
| 273 | * down the device, and therefore we can not handle FF erase |
| 274 | * requests: either we are handling UI_DEV_DESTROY (and holding |
| 275 | * the udev->mutex), or the file descriptor is closed and there is |
| 276 | * nobody on the other side anymore. |
| 277 | */ |
| 278 | return file ? input_ff_flush(dev, file) : 0; |
| 279 | } |
| 280 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 281 | static void uinput_destroy_device(struct uinput_device *udev) |
| 282 | { |
| 283 | const char *name, *phys; |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 284 | struct input_dev *dev = udev->dev; |
| 285 | enum uinput_state old_state = udev->state; |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 286 | |
Aristeu Sergio Rozanski Filho | 05cebd3 | 2009-05-14 22:01:57 -0700 | [diff] [blame] | 287 | udev->state = UIST_NEW_DEVICE; |
| 288 | |
| 289 | if (dev) { |
| 290 | name = dev->name; |
| 291 | phys = dev->phys; |
| 292 | if (old_state == UIST_CREATED) { |
| 293 | uinput_flush_requests(udev); |
| 294 | input_unregister_device(dev); |
| 295 | } else { |
| 296 | input_free_device(dev); |
| 297 | } |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 298 | kfree(name); |
| 299 | kfree(phys); |
| 300 | udev->dev = NULL; |
| 301 | } |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 302 | } |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | static int uinput_create_device(struct uinput_device *udev) |
| 305 | { |
Anssi Hannula | ff46255 | 2006-07-19 01:41:09 -0400 | [diff] [blame] | 306 | struct input_dev *dev = udev->dev; |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 307 | int error, nslot; |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 308 | |
| 309 | if (udev->state != UIST_SETUP_COMPLETE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); |
| 311 | return -EINVAL; |
| 312 | } |
| 313 | |
Dmitry Torokhov | 601bbbe | 2017-01-31 14:56:43 -0800 | [diff] [blame] | 314 | if (test_bit(EV_ABS, dev->evbit)) { |
| 315 | input_alloc_absinfo(dev); |
| 316 | if (!dev->absinfo) { |
| 317 | error = -EINVAL; |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 318 | goto fail1; |
Dmitry Torokhov | 601bbbe | 2017-01-31 14:56:43 -0800 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | if (test_bit(ABS_MT_SLOT, dev->absbit)) { |
| 322 | nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; |
| 323 | error = input_mt_init_slots(dev, nslot, 0); |
| 324 | if (error) |
| 325 | goto fail1; |
| 326 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { |
| 327 | input_set_events_per_packet(dev, 60); |
| 328 | } |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 329 | } |
| 330 | |
Elias Vanderstuyft | daf6cd0 | 2015-12-18 17:32:19 -0800 | [diff] [blame] | 331 | if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) { |
| 332 | printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n", |
| 333 | UINPUT_NAME); |
| 334 | error = -EINVAL; |
| 335 | goto fail1; |
| 336 | } |
| 337 | |
Anssi Hannula | ff46255 | 2006-07-19 01:41:09 -0400 | [diff] [blame] | 338 | if (udev->ff_effects_max) { |
| 339 | error = input_ff_create(dev, udev->ff_effects_max); |
| 340 | if (error) |
| 341 | goto fail1; |
| 342 | |
| 343 | dev->ff->upload = uinput_dev_upload_effect; |
| 344 | dev->ff->erase = uinput_dev_erase_effect; |
| 345 | dev->ff->playback = uinput_dev_playback; |
| 346 | dev->ff->set_gain = uinput_dev_set_gain; |
| 347 | dev->ff->set_autocenter = uinput_dev_set_autocenter; |
Dmitry Torokhov | e8b9572 | 2017-09-01 17:13:43 -0700 | [diff] [blame] | 348 | /* |
| 349 | * The standard input_ff_flush() implementation does |
| 350 | * not quite work for uinput as we can't reasonably |
| 351 | * handle FF requests during device teardown. |
| 352 | */ |
| 353 | dev->flush = uinput_dev_flush; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | |
Dmitry Torokhov | 04ce40a | 2017-09-06 16:42:26 -0700 | [diff] [blame] | 356 | dev->event = uinput_dev_event; |
| 357 | |
| 358 | input_set_drvdata(udev->dev, udev); |
| 359 | |
Anssi Hannula | ff46255 | 2006-07-19 01:41:09 -0400 | [diff] [blame] | 360 | error = input_register_device(udev->dev); |
| 361 | if (error) |
| 362 | goto fail2; |
| 363 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 364 | udev->state = UIST_CREATED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | return 0; |
Anssi Hannula | ff46255 | 2006-07-19 01:41:09 -0400 | [diff] [blame] | 367 | |
| 368 | fail2: input_ff_destroy(dev); |
| 369 | fail1: uinput_destroy_device(udev); |
| 370 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | static int uinput_open(struct inode *inode, struct file *file) |
| 374 | { |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 375 | struct uinput_device *newdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 377 | newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | if (!newdev) |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 379 | return -ENOMEM; |
| 380 | |
Dmitry Torokhov | 221979a | 2006-02-19 00:22:36 -0500 | [diff] [blame] | 381 | mutex_init(&newdev->mutex); |
Dmitry Torokhov | 0048e60 | 2005-06-30 00:48:14 -0500 | [diff] [blame] | 382 | spin_lock_init(&newdev->requests_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | init_waitqueue_head(&newdev->requests_waitq); |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 384 | init_waitqueue_head(&newdev->waitq); |
| 385 | newdev->state = UIST_NEW_DEVICE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
| 387 | file->private_data = newdev; |
Kirill Smelkov | c5bf68f | 2019-03-26 23:51:19 +0300 | [diff] [blame] | 388 | stream_open(inode, file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
| 390 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
| 392 | |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 393 | static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code, |
| 394 | const struct input_absinfo *abs) |
| 395 | { |
Dmitry Torokhov | d77651a | 2019-01-14 13:54:55 -0800 | [diff] [blame] | 396 | int min, max, range; |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 397 | |
| 398 | min = abs->minimum; |
| 399 | max = abs->maximum; |
| 400 | |
Peter Hutterer | 4fef125 | 2018-09-18 09:53:32 -0700 | [diff] [blame] | 401 | if ((min != 0 || max != 0) && max < min) { |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 402 | printk(KERN_DEBUG |
| 403 | "%s: invalid abs[%02x] min:%d max:%d\n", |
| 404 | UINPUT_NAME, code, min, max); |
| 405 | return -EINVAL; |
| 406 | } |
| 407 | |
Dmitry Torokhov | d77651a | 2019-01-14 13:54:55 -0800 | [diff] [blame] | 408 | if (!check_sub_overflow(max, min, &range) && abs->flat > range) { |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 409 | printk(KERN_DEBUG |
| 410 | "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n", |
| 411 | UINPUT_NAME, code, abs->flat, min, max); |
| 412 | return -EINVAL; |
| 413 | } |
| 414 | |
| 415 | return 0; |
| 416 | } |
| 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | static int uinput_validate_absbits(struct input_dev *dev) |
| 419 | { |
| 420 | unsigned int cnt; |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 421 | int error; |
David Herrmann | bcb898e | 2014-07-20 17:16:23 -0700 | [diff] [blame] | 422 | |
| 423 | if (!test_bit(EV_ABS, dev->evbit)) |
| 424 | return 0; |
| 425 | |
| 426 | /* |
| 427 | * Check if absmin/absmax/absfuzz/absflat are sane. |
| 428 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
Anshul Garg | b6d3096 | 2015-07-09 10:18:22 -0700 | [diff] [blame] | 430 | for_each_set_bit(cnt, dev->absbit, ABS_CNT) { |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 431 | if (!dev->absinfo) |
David Herrmann | bcb898e | 2014-07-20 17:16:23 -0700 | [diff] [blame] | 432 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 434 | error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]); |
| 435 | if (error) |
| 436 | return error; |
David Herrmann | bcb898e | 2014-07-20 17:16:23 -0700 | [diff] [blame] | 437 | } |
| 438 | |
| 439 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
| 441 | |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 442 | static int uinput_dev_setup(struct uinput_device *udev, |
| 443 | struct uinput_setup __user *arg) |
| 444 | { |
| 445 | struct uinput_setup setup; |
| 446 | struct input_dev *dev; |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 447 | |
| 448 | if (udev->state == UIST_CREATED) |
| 449 | return -EINVAL; |
| 450 | |
| 451 | if (copy_from_user(&setup, arg, sizeof(setup))) |
| 452 | return -EFAULT; |
| 453 | |
| 454 | if (!setup.name[0]) |
| 455 | return -EINVAL; |
| 456 | |
| 457 | dev = udev->dev; |
| 458 | dev->id = setup.id; |
| 459 | udev->ff_effects_max = setup.ff_effects_max; |
| 460 | |
| 461 | kfree(dev->name); |
| 462 | dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL); |
| 463 | if (!dev->name) |
| 464 | return -ENOMEM; |
| 465 | |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 466 | udev->state = UIST_SETUP_COMPLETE; |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | static int uinput_abs_setup(struct uinput_device *udev, |
| 471 | struct uinput_setup __user *arg, size_t size) |
| 472 | { |
| 473 | struct uinput_abs_setup setup = {}; |
| 474 | struct input_dev *dev; |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 475 | int error; |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 476 | |
| 477 | if (size > sizeof(setup)) |
| 478 | return -E2BIG; |
| 479 | |
| 480 | if (udev->state == UIST_CREATED) |
| 481 | return -EINVAL; |
| 482 | |
| 483 | if (copy_from_user(&setup, arg, size)) |
| 484 | return -EFAULT; |
| 485 | |
| 486 | if (setup.code > ABS_MAX) |
| 487 | return -ERANGE; |
| 488 | |
| 489 | dev = udev->dev; |
| 490 | |
David Herrmann | fbae10d | 2015-10-25 10:34:13 +0100 | [diff] [blame] | 491 | error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo); |
| 492 | if (error) |
| 493 | return error; |
| 494 | |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 495 | input_alloc_absinfo(dev); |
| 496 | if (!dev->absinfo) |
| 497 | return -ENOMEM; |
| 498 | |
| 499 | set_bit(setup.code, dev->absbit); |
| 500 | dev->absinfo[setup.code] = setup.absinfo; |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | /* legacy setup via write() */ |
| 505 | static int uinput_setup_device_legacy(struct uinput_device *udev, |
| 506 | const char __user *buffer, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | { |
| 508 | struct uinput_user_dev *user_dev; |
| 509 | struct input_dev *dev; |
David Herrmann | 5d9d6e9 | 2011-02-11 01:10:44 -0800 | [diff] [blame] | 510 | int i; |
Dmitry Torokhov | 152c12f | 2005-06-30 00:47:50 -0500 | [diff] [blame] | 511 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 513 | if (count != sizeof(struct uinput_user_dev)) |
| 514 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 516 | if (!udev->dev) { |
Dmitry Torokhov | 04ce40a | 2017-09-06 16:42:26 -0700 | [diff] [blame] | 517 | udev->dev = input_allocate_device(); |
| 518 | if (!udev->dev) |
| 519 | return -ENOMEM; |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 520 | } |
| 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | dev = udev->dev; |
| 523 | |
Dmitry Torokhov | 4dfcc27 | 2011-02-11 01:10:45 -0800 | [diff] [blame] | 524 | user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); |
Dan Carpenter | 163d277 | 2011-02-18 08:30:52 -0800 | [diff] [blame] | 525 | if (IS_ERR(user_dev)) |
Dmitry Torokhov | 4dfcc27 | 2011-02-11 01:10:45 -0800 | [diff] [blame] | 526 | return PTR_ERR(user_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
Anssi Hannula | ff46255 | 2006-07-19 01:41:09 -0400 | [diff] [blame] | 528 | udev->ff_effects_max = user_dev->ff_effects_max; |
| 529 | |
David Herrmann | 5d9d6e9 | 2011-02-11 01:10:44 -0800 | [diff] [blame] | 530 | /* Ensure name is filled in */ |
| 531 | if (!user_dev->name[0]) { |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 532 | retval = -EINVAL; |
| 533 | goto exit; |
| 534 | } |
| 535 | |
| 536 | kfree(dev->name); |
David Herrmann | 5d9d6e9 | 2011-02-11 01:10:44 -0800 | [diff] [blame] | 537 | dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, |
| 538 | GFP_KERNEL); |
| 539 | if (!dev->name) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | retval = -ENOMEM; |
| 541 | goto exit; |
| 542 | } |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | dev->id.bustype = user_dev->id.bustype; |
| 545 | dev->id.vendor = user_dev->id.vendor; |
| 546 | dev->id.product = user_dev->id.product; |
| 547 | dev->id.version = user_dev->id.version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Dmitry Torokhov | 72d4736 | 2015-09-19 11:22:57 -0700 | [diff] [blame] | 549 | for (i = 0; i < ABS_CNT; i++) { |
Daniel Mack | 987a6c0 | 2010-08-02 20:15:17 -0700 | [diff] [blame] | 550 | input_abs_set_max(dev, i, user_dev->absmax[i]); |
| 551 | input_abs_set_min(dev, i, user_dev->absmin[i]); |
| 552 | input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); |
| 553 | input_abs_set_flat(dev, i, user_dev->absflat[i]); |
| 554 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
David Herrmann | bcb898e | 2014-07-20 17:16:23 -0700 | [diff] [blame] | 556 | retval = uinput_validate_absbits(dev); |
| 557 | if (retval < 0) |
| 558 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 560 | udev->state = UIST_SETUP_COMPLETE; |
| 561 | retval = count; |
| 562 | |
| 563 | exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | kfree(user_dev); |
| 565 | return retval; |
| 566 | } |
| 567 | |
Ryan Mallon | cbf0541 | 2013-09-18 12:40:47 -0700 | [diff] [blame] | 568 | static ssize_t uinput_inject_events(struct uinput_device *udev, |
| 569 | const char __user *buffer, size_t count) |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 570 | { |
| 571 | struct input_event ev; |
Ryan Mallon | cbf0541 | 2013-09-18 12:40:47 -0700 | [diff] [blame] | 572 | size_t bytes = 0; |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 573 | |
Ryan Mallon | cbf0541 | 2013-09-18 12:40:47 -0700 | [diff] [blame] | 574 | if (count != 0 && count < input_event_size()) |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 575 | return -EINVAL; |
| 576 | |
Ryan Mallon | cbf0541 | 2013-09-18 12:40:47 -0700 | [diff] [blame] | 577 | while (bytes + input_event_size() <= count) { |
| 578 | /* |
| 579 | * Note that even if some events were fetched successfully |
| 580 | * we are still going to return EFAULT instead of partial |
| 581 | * count to let userspace know that it got it's buffers |
| 582 | * all wrong. |
| 583 | */ |
| 584 | if (input_event_from_user(buffer + bytes, &ev)) |
| 585 | return -EFAULT; |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 586 | |
Ryan Mallon | cbf0541 | 2013-09-18 12:40:47 -0700 | [diff] [blame] | 587 | input_event(udev->dev, ev.type, ev.code, ev.value); |
| 588 | bytes += input_event_size(); |
Dmitry Torokhov | cecf107 | 2018-10-04 17:50:48 -0700 | [diff] [blame] | 589 | cond_resched(); |
Ryan Mallon | cbf0541 | 2013-09-18 12:40:47 -0700 | [diff] [blame] | 590 | } |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 591 | |
Ryan Mallon | cbf0541 | 2013-09-18 12:40:47 -0700 | [diff] [blame] | 592 | return bytes; |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 593 | } |
| 594 | |
Dmitry Torokhov | 54ce165 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 595 | static ssize_t uinput_write(struct file *file, const char __user *buffer, |
| 596 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | { |
| 598 | struct uinput_device *udev = file->private_data; |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 599 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 601 | if (count == 0) |
| 602 | return 0; |
| 603 | |
Dmitry Torokhov | 221979a | 2006-02-19 00:22:36 -0500 | [diff] [blame] | 604 | retval = mutex_lock_interruptible(&udev->mutex); |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 605 | if (retval) |
| 606 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 608 | retval = udev->state == UIST_CREATED ? |
Ryan Mallon | cbf0541 | 2013-09-18 12:40:47 -0700 | [diff] [blame] | 609 | uinput_inject_events(udev, buffer, count) : |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 610 | uinput_setup_device_legacy(udev, buffer, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Dmitry Torokhov | 221979a | 2006-02-19 00:22:36 -0500 | [diff] [blame] | 612 | mutex_unlock(&udev->mutex); |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 613 | |
| 614 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } |
| 616 | |
Dmitry Torokhov | 929d1af | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 617 | static bool uinput_fetch_next_event(struct uinput_device *udev, |
| 618 | struct input_event *event) |
| 619 | { |
| 620 | bool have_event; |
| 621 | |
| 622 | spin_lock_irq(&udev->dev->event_lock); |
| 623 | |
| 624 | have_event = udev->head != udev->tail; |
| 625 | if (have_event) { |
| 626 | *event = udev->buff[udev->tail]; |
| 627 | udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; |
| 628 | } |
| 629 | |
| 630 | spin_unlock_irq(&udev->dev->event_lock); |
| 631 | |
| 632 | return have_event; |
| 633 | } |
| 634 | |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 635 | static ssize_t uinput_events_to_user(struct uinput_device *udev, |
| 636 | char __user *buffer, size_t count) |
| 637 | { |
| 638 | struct input_event event; |
| 639 | size_t read = 0; |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 640 | |
| 641 | while (read + input_event_size() <= count && |
| 642 | uinput_fetch_next_event(udev, &event)) { |
| 643 | |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 644 | if (input_event_to_user(buffer + read, &event)) |
| 645 | return -EFAULT; |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 646 | |
| 647 | read += input_event_size(); |
| 648 | } |
| 649 | |
Dmitry Torokhov | 00ce756 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 650 | return read; |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | static ssize_t uinput_read(struct file *file, char __user *buffer, |
| 654 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
| 656 | struct uinput_device *udev = file->private_data; |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 657 | ssize_t retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
David Herrmann | f40033a | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 659 | if (count != 0 && count < input_event_size()) |
| 660 | return -EINVAL; |
| 661 | |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 662 | do { |
| 663 | retval = mutex_lock_interruptible(&udev->mutex); |
| 664 | if (retval) |
| 665 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 667 | if (udev->state != UIST_CREATED) |
| 668 | retval = -ENODEV; |
| 669 | else if (udev->head == udev->tail && |
| 670 | (file->f_flags & O_NONBLOCK)) |
| 671 | retval = -EAGAIN; |
| 672 | else |
| 673 | retval = uinput_events_to_user(udev, buffer, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 675 | mutex_unlock(&udev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 677 | if (retval || count == 0) |
| 678 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Dmitry Torokhov | 22ae19c | 2012-07-29 22:48:31 -0700 | [diff] [blame] | 680 | if (!(file->f_flags & O_NONBLOCK)) |
| 681 | retval = wait_event_interruptible(udev->waitq, |
| 682 | udev->head != udev->tail || |
| 683 | udev->state != UIST_CREATED); |
| 684 | } while (retval == 0); |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | return retval; |
| 687 | } |
| 688 | |
Al Viro | afc9a42 | 2017-07-03 06:39:46 -0400 | [diff] [blame] | 689 | static __poll_t uinput_poll(struct file *file, poll_table *wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | { |
| 691 | struct uinput_device *udev = file->private_data; |
| 692 | |
| 693 | poll_wait(file, &udev->waitq, wait); |
| 694 | |
| 695 | if (udev->head != udev->tail) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 696 | return EPOLLIN | EPOLLRDNORM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
| 698 | return 0; |
| 699 | } |
| 700 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 701 | static int uinput_release(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 703 | struct uinput_device *udev = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 705 | uinput_destroy_device(udev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | kfree(udev); |
| 707 | |
| 708 | return 0; |
| 709 | } |
| 710 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 711 | #ifdef CONFIG_COMPAT |
| 712 | struct uinput_ff_upload_compat { |
Dmitry Torokhov | c5b3533 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 713 | __u32 request_id; |
| 714 | __s32 retval; |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 715 | struct ff_effect_compat effect; |
| 716 | struct ff_effect_compat old; |
| 717 | }; |
| 718 | |
| 719 | static int uinput_ff_upload_to_user(char __user *buffer, |
| 720 | const struct uinput_ff_upload *ff_up) |
| 721 | { |
Andrew Morton | b8b4ead | 2016-03-25 14:20:47 -0700 | [diff] [blame] | 722 | if (in_compat_syscall()) { |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 723 | struct uinput_ff_upload_compat ff_up_compat; |
| 724 | |
| 725 | ff_up_compat.request_id = ff_up->request_id; |
| 726 | ff_up_compat.retval = ff_up->retval; |
| 727 | /* |
| 728 | * It so happens that the pointer that gives us the trouble |
| 729 | * is the last field in the structure. Since we don't support |
| 730 | * custom waveforms in uinput anyway we can just copy the whole |
| 731 | * thing (to the compat size) and ignore the pointer. |
| 732 | */ |
| 733 | memcpy(&ff_up_compat.effect, &ff_up->effect, |
| 734 | sizeof(struct ff_effect_compat)); |
| 735 | memcpy(&ff_up_compat.old, &ff_up->old, |
| 736 | sizeof(struct ff_effect_compat)); |
| 737 | |
| 738 | if (copy_to_user(buffer, &ff_up_compat, |
| 739 | sizeof(struct uinput_ff_upload_compat))) |
| 740 | return -EFAULT; |
| 741 | } else { |
| 742 | if (copy_to_user(buffer, ff_up, |
| 743 | sizeof(struct uinput_ff_upload))) |
| 744 | return -EFAULT; |
| 745 | } |
| 746 | |
| 747 | return 0; |
| 748 | } |
| 749 | |
| 750 | static int uinput_ff_upload_from_user(const char __user *buffer, |
| 751 | struct uinput_ff_upload *ff_up) |
| 752 | { |
Andrew Morton | b8b4ead | 2016-03-25 14:20:47 -0700 | [diff] [blame] | 753 | if (in_compat_syscall()) { |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 754 | struct uinput_ff_upload_compat ff_up_compat; |
| 755 | |
| 756 | if (copy_from_user(&ff_up_compat, buffer, |
| 757 | sizeof(struct uinput_ff_upload_compat))) |
| 758 | return -EFAULT; |
| 759 | |
| 760 | ff_up->request_id = ff_up_compat.request_id; |
| 761 | ff_up->retval = ff_up_compat.retval; |
| 762 | memcpy(&ff_up->effect, &ff_up_compat.effect, |
| 763 | sizeof(struct ff_effect_compat)); |
| 764 | memcpy(&ff_up->old, &ff_up_compat.old, |
| 765 | sizeof(struct ff_effect_compat)); |
| 766 | |
| 767 | } else { |
| 768 | if (copy_from_user(ff_up, buffer, |
| 769 | sizeof(struct uinput_ff_upload))) |
| 770 | return -EFAULT; |
| 771 | } |
| 772 | |
| 773 | return 0; |
| 774 | } |
| 775 | |
| 776 | #else |
| 777 | |
| 778 | static int uinput_ff_upload_to_user(char __user *buffer, |
| 779 | const struct uinput_ff_upload *ff_up) |
| 780 | { |
| 781 | if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) |
| 782 | return -EFAULT; |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | static int uinput_ff_upload_from_user(const char __user *buffer, |
| 788 | struct uinput_ff_upload *ff_up) |
| 789 | { |
| 790 | if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) |
| 791 | return -EFAULT; |
| 792 | |
| 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | #endif |
| 797 | |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 798 | #define uinput_set_bit(_arg, _bit, _max) \ |
| 799 | ({ \ |
| 800 | int __ret = 0; \ |
| 801 | if (udev->state == UIST_CREATED) \ |
| 802 | __ret = -EINVAL; \ |
| 803 | else if ((_arg) > (_max)) \ |
| 804 | __ret = -EINVAL; \ |
| 805 | else set_bit((_arg), udev->dev->_bit); \ |
| 806 | __ret; \ |
| 807 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
Benjamin Tissoires | e3480a6 | 2014-01-30 17:20:24 -0800 | [diff] [blame] | 809 | static int uinput_str_to_user(void __user *dest, const char *str, |
| 810 | unsigned int maxlen) |
| 811 | { |
| 812 | char __user *p = dest; |
| 813 | int len, ret; |
| 814 | |
| 815 | if (!str) |
| 816 | return -ENOENT; |
| 817 | |
| 818 | if (maxlen == 0) |
| 819 | return -EINVAL; |
| 820 | |
| 821 | len = strlen(str) + 1; |
| 822 | if (len > maxlen) |
| 823 | len = maxlen; |
| 824 | |
| 825 | ret = copy_to_user(p, str, len); |
| 826 | if (ret) |
| 827 | return -EFAULT; |
| 828 | |
| 829 | /* force terminating '\0' */ |
| 830 | ret = put_user(0, p + len - 1); |
| 831 | return ret ? -EFAULT : len; |
| 832 | } |
| 833 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 834 | static long uinput_ioctl_handler(struct file *file, unsigned int cmd, |
| 835 | unsigned long arg, void __user *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | { |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 837 | int retval; |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 838 | struct uinput_device *udev = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | struct uinput_ff_upload ff_up; |
| 840 | struct uinput_ff_erase ff_erase; |
| 841 | struct uinput_request *req; |
Dmitry Torokhov | 5b6271bd | 2005-06-30 00:50:38 -0500 | [diff] [blame] | 842 | char *phys; |
Benjamin Tissoires | e3480a6 | 2014-01-30 17:20:24 -0800 | [diff] [blame] | 843 | const char *name; |
| 844 | unsigned int size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
Dmitry Torokhov | 221979a | 2006-02-19 00:22:36 -0500 | [diff] [blame] | 846 | retval = mutex_lock_interruptible(&udev->mutex); |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 847 | if (retval) |
| 848 | return retval; |
| 849 | |
| 850 | if (!udev->dev) { |
Dmitry Torokhov | 04ce40a | 2017-09-06 16:42:26 -0700 | [diff] [blame] | 851 | udev->dev = input_allocate_device(); |
Dan Carpenter | 781f2dd | 2017-11-10 10:21:53 -0800 | [diff] [blame] | 852 | if (!udev->dev) { |
| 853 | retval = -ENOMEM; |
| 854 | goto out; |
| 855 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | switch (cmd) { |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 859 | case UI_GET_VERSION: |
| 860 | if (put_user(UINPUT_VERSION, (unsigned int __user *)p)) |
| 861 | retval = -EFAULT; |
| 862 | goto out; |
| 863 | |
| 864 | case UI_DEV_CREATE: |
| 865 | retval = uinput_create_device(udev); |
| 866 | goto out; |
| 867 | |
| 868 | case UI_DEV_DESTROY: |
| 869 | uinput_destroy_device(udev); |
| 870 | goto out; |
| 871 | |
| 872 | case UI_DEV_SETUP: |
| 873 | retval = uinput_dev_setup(udev, p); |
| 874 | goto out; |
| 875 | |
| 876 | /* UI_ABS_SETUP is handled in the variable size ioctls */ |
| 877 | |
| 878 | case UI_SET_EVBIT: |
| 879 | retval = uinput_set_bit(arg, evbit, EV_MAX); |
| 880 | goto out; |
| 881 | |
| 882 | case UI_SET_KEYBIT: |
| 883 | retval = uinput_set_bit(arg, keybit, KEY_MAX); |
| 884 | goto out; |
| 885 | |
| 886 | case UI_SET_RELBIT: |
| 887 | retval = uinput_set_bit(arg, relbit, REL_MAX); |
| 888 | goto out; |
| 889 | |
| 890 | case UI_SET_ABSBIT: |
| 891 | retval = uinput_set_bit(arg, absbit, ABS_MAX); |
| 892 | goto out; |
| 893 | |
| 894 | case UI_SET_MSCBIT: |
| 895 | retval = uinput_set_bit(arg, mscbit, MSC_MAX); |
| 896 | goto out; |
| 897 | |
| 898 | case UI_SET_LEDBIT: |
| 899 | retval = uinput_set_bit(arg, ledbit, LED_MAX); |
| 900 | goto out; |
| 901 | |
| 902 | case UI_SET_SNDBIT: |
| 903 | retval = uinput_set_bit(arg, sndbit, SND_MAX); |
| 904 | goto out; |
| 905 | |
| 906 | case UI_SET_FFBIT: |
| 907 | retval = uinput_set_bit(arg, ffbit, FF_MAX); |
| 908 | goto out; |
| 909 | |
| 910 | case UI_SET_SWBIT: |
| 911 | retval = uinput_set_bit(arg, swbit, SW_MAX); |
| 912 | goto out; |
| 913 | |
| 914 | case UI_SET_PROPBIT: |
| 915 | retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); |
| 916 | goto out; |
| 917 | |
| 918 | case UI_SET_PHYS: |
| 919 | if (udev->state == UIST_CREATED) { |
| 920 | retval = -EINVAL; |
| 921 | goto out; |
| 922 | } |
| 923 | |
| 924 | phys = strndup_user(p, 1024); |
| 925 | if (IS_ERR(phys)) { |
| 926 | retval = PTR_ERR(phys); |
| 927 | goto out; |
| 928 | } |
| 929 | |
| 930 | kfree(udev->dev->phys); |
| 931 | udev->dev->phys = phys; |
| 932 | goto out; |
| 933 | |
| 934 | case UI_BEGIN_FF_UPLOAD: |
| 935 | retval = uinput_ff_upload_from_user(p, &ff_up); |
| 936 | if (retval) |
David Herrmann | ba4e9a6 | 2014-07-20 17:27:09 -0700 | [diff] [blame] | 937 | goto out; |
| 938 | |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 939 | req = uinput_request_find(udev, ff_up.request_id); |
| 940 | if (!req || req->code != UI_FF_UPLOAD || |
| 941 | !req->u.upload.effect) { |
| 942 | retval = -EINVAL; |
| 943 | goto out; |
| 944 | } |
| 945 | |
| 946 | ff_up.retval = 0; |
| 947 | ff_up.effect = *req->u.upload.effect; |
| 948 | if (req->u.upload.old) |
| 949 | ff_up.old = *req->u.upload.old; |
| 950 | else |
| 951 | memset(&ff_up.old, 0, sizeof(struct ff_effect)); |
| 952 | |
| 953 | retval = uinput_ff_upload_to_user(p, &ff_up); |
| 954 | goto out; |
| 955 | |
| 956 | case UI_BEGIN_FF_ERASE: |
| 957 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { |
| 958 | retval = -EFAULT; |
| 959 | goto out; |
| 960 | } |
| 961 | |
| 962 | req = uinput_request_find(udev, ff_erase.request_id); |
| 963 | if (!req || req->code != UI_FF_ERASE) { |
| 964 | retval = -EINVAL; |
| 965 | goto out; |
| 966 | } |
| 967 | |
| 968 | ff_erase.retval = 0; |
| 969 | ff_erase.effect_id = req->u.effect_id; |
| 970 | if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { |
| 971 | retval = -EFAULT; |
| 972 | goto out; |
| 973 | } |
| 974 | |
| 975 | goto out; |
| 976 | |
| 977 | case UI_END_FF_UPLOAD: |
| 978 | retval = uinput_ff_upload_from_user(p, &ff_up); |
| 979 | if (retval) |
Benjamin Tisssoires | 9d51e80 | 2014-01-30 17:16:36 -0800 | [diff] [blame] | 980 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 982 | req = uinput_request_find(udev, ff_up.request_id); |
| 983 | if (!req || req->code != UI_FF_UPLOAD || |
| 984 | !req->u.upload.effect) { |
| 985 | retval = -EINVAL; |
Benjamin Tisssoires | 9d51e80 | 2014-01-30 17:16:36 -0800 | [diff] [blame] | 986 | goto out; |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 987 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 989 | req->retval = ff_up.retval; |
| 990 | complete(&req->done); |
| 991 | goto out; |
| 992 | |
| 993 | case UI_END_FF_ERASE: |
| 994 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { |
| 995 | retval = -EFAULT; |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 996 | goto out; |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 997 | } |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 998 | |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 999 | req = uinput_request_find(udev, ff_erase.request_id); |
| 1000 | if (!req || req->code != UI_FF_ERASE) { |
| 1001 | retval = -EINVAL; |
Benjamin Tisssoires | 9d51e80 | 2014-01-30 17:16:36 -0800 | [diff] [blame] | 1002 | goto out; |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 1003 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
Dmitry Torokhov | c066165 | 2017-09-06 16:34:31 -0700 | [diff] [blame] | 1005 | req->retval = ff_erase.retval; |
| 1006 | complete(&req->done); |
| 1007 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | } |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 1009 | |
Benjamin Tissoires | e3480a6 | 2014-01-30 17:20:24 -0800 | [diff] [blame] | 1010 | size = _IOC_SIZE(cmd); |
| 1011 | |
| 1012 | /* Now check variable-length commands */ |
| 1013 | switch (cmd & ~IOCSIZE_MASK) { |
| 1014 | case UI_GET_SYSNAME(0): |
| 1015 | if (udev->state != UIST_CREATED) { |
| 1016 | retval = -ENOENT; |
| 1017 | goto out; |
| 1018 | } |
| 1019 | name = dev_name(&udev->dev->dev); |
| 1020 | retval = uinput_str_to_user(p, name, size); |
| 1021 | goto out; |
Benjamin Tissoires | 052876f8e | 2015-12-18 17:20:09 -0800 | [diff] [blame] | 1022 | |
| 1023 | case UI_ABS_SETUP & ~IOCSIZE_MASK: |
| 1024 | retval = uinput_abs_setup(udev, p, size); |
| 1025 | goto out; |
Benjamin Tissoires | e3480a6 | 2014-01-30 17:20:24 -0800 | [diff] [blame] | 1026 | } |
| 1027 | |
Benjamin Tisssoires | 9d51e80 | 2014-01-30 17:16:36 -0800 | [diff] [blame] | 1028 | retval = -EINVAL; |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 1029 | out: |
Dmitry Torokhov | 221979a | 2006-02-19 00:22:36 -0500 | [diff] [blame] | 1030 | mutex_unlock(&udev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | return retval; |
| 1032 | } |
| 1033 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 1034 | static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1035 | { |
| 1036 | return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); |
| 1037 | } |
| 1038 | |
| 1039 | #ifdef CONFIG_COMPAT |
Ricky Liang | affa80b | 2016-05-20 10:58:59 -0700 | [diff] [blame] | 1040 | |
Andrey Smirnov | 7c7da40 | 2019-05-23 12:55:26 -0700 | [diff] [blame] | 1041 | /* |
| 1042 | * These IOCTLs change their size and thus their numbers between |
| 1043 | * 32 and 64 bits. |
| 1044 | */ |
| 1045 | #define UI_SET_PHYS_COMPAT \ |
| 1046 | _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t) |
| 1047 | #define UI_BEGIN_FF_UPLOAD_COMPAT \ |
| 1048 | _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat) |
| 1049 | #define UI_END_FF_UPLOAD_COMPAT \ |
| 1050 | _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat) |
Ricky Liang | affa80b | 2016-05-20 10:58:59 -0700 | [diff] [blame] | 1051 | |
Dmitry Torokhov | 54ce165 | 2012-07-29 22:48:32 -0700 | [diff] [blame] | 1052 | static long uinput_compat_ioctl(struct file *file, |
| 1053 | unsigned int cmd, unsigned long arg) |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 1054 | { |
Andrey Smirnov | 7c7da40 | 2019-05-23 12:55:26 -0700 | [diff] [blame] | 1055 | switch (cmd) { |
| 1056 | case UI_SET_PHYS_COMPAT: |
Ricky Liang | affa80b | 2016-05-20 10:58:59 -0700 | [diff] [blame] | 1057 | cmd = UI_SET_PHYS; |
Andrey Smirnov | 7c7da40 | 2019-05-23 12:55:26 -0700 | [diff] [blame] | 1058 | break; |
| 1059 | case UI_BEGIN_FF_UPLOAD_COMPAT: |
| 1060 | cmd = UI_BEGIN_FF_UPLOAD; |
| 1061 | break; |
| 1062 | case UI_END_FF_UPLOAD_COMPAT: |
| 1063 | cmd = UI_END_FF_UPLOAD; |
| 1064 | break; |
| 1065 | } |
Ricky Liang | affa80b | 2016-05-20 10:58:59 -0700 | [diff] [blame] | 1066 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 1067 | return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); |
| 1068 | } |
| 1069 | #endif |
| 1070 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 1071 | static const struct file_operations uinput_fops = { |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 1072 | .owner = THIS_MODULE, |
| 1073 | .open = uinput_open, |
| 1074 | .release = uinput_release, |
| 1075 | .read = uinput_read, |
| 1076 | .write = uinput_write, |
| 1077 | .poll = uinput_poll, |
| 1078 | .unlocked_ioctl = uinput_ioctl, |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 1079 | #ifdef CONFIG_COMPAT |
| 1080 | .compat_ioctl = uinput_compat_ioctl, |
| 1081 | #endif |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1082 | .llseek = no_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | }; |
| 1084 | |
| 1085 | static struct miscdevice uinput_misc = { |
Dmitry Torokhov | 2950641 | 2005-11-20 00:51:22 -0500 | [diff] [blame] | 1086 | .fops = &uinput_fops, |
| 1087 | .minor = UINPUT_MINOR, |
| 1088 | .name = UINPUT_NAME, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | }; |
PrasannaKumar Muralidharan | ca75d60 | 2016-08-25 22:30:49 +0530 | [diff] [blame] | 1090 | module_misc_device(uinput_misc); |
| 1091 | |
Kay Sievers | 8905aaa | 2010-08-19 09:52:28 -0700 | [diff] [blame] | 1092 | MODULE_ALIAS_MISCDEV(UINPUT_MINOR); |
| 1093 | MODULE_ALIAS("devname:" UINPUT_NAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); |
| 1096 | MODULE_DESCRIPTION("User level driver support for input subsystem"); |
| 1097 | MODULE_LICENSE("GPL"); |