blob: cb0137b3718d8cd0a42d6483a9817a26733452c6 [file] [log] [blame]
Jiri Kosina86166b72007-05-14 09:57:40 +02001/*
2 * HID raw devices, giving access to raw HID events.
3 *
4 * In comparison to hiddev, this device does not process the
5 * hid events at all (no parsing, no lookups). This lets applications
6 * to work on raw hid events as they want to, and avoids a need to
7 * use a transport-specific userspace libhid/libusb libraries.
8 *
Jiri Kosina61834532014-01-06 16:43:27 +01009 * Copyright (c) 2007-2014 Jiri Kosina
Jiri Kosina86166b72007-05-14 09:57:40 +020010 */
11
12/*
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms and conditions of the GNU General Public License,
15 * version 2, as published by the Free Software Foundation.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20 */
21
Joe Perches4291ee32010-12-09 19:29:03 -080022#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
Jiri Kosina86166b72007-05-14 09:57:40 +020024#include <linux/fs.h>
25#include <linux/module.h>
26#include <linux/errno.h>
27#include <linux/kernel.h>
28#include <linux/init.h>
29#include <linux/cdev.h>
30#include <linux/poll.h>
31#include <linux/device.h>
32#include <linux/major.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Jiri Kosina86166b72007-05-14 09:57:40 +020034#include <linux/hid.h>
35#include <linux/mutex.h>
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040036#include <linux/sched.h>
Jiri Kosina86166b72007-05-14 09:57:40 +020037
38#include <linux/hidraw.h>
39
40static int hidraw_major;
41static struct cdev hidraw_cdev;
42static struct class *hidraw_class;
43static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES];
Oliver Neukum7d672cd2008-10-31 00:07:23 +010044static DEFINE_MUTEX(minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +020045
46static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
47{
48 struct hidraw_list *list = file->private_data;
49 int ret = 0, len;
Jiri Kosina86166b72007-05-14 09:57:40 +020050 DECLARE_WAITQUEUE(wait, current);
51
Jiri Kosinab0e14952009-10-12 11:25:56 +020052 mutex_lock(&list->read_mutex);
53
Jiri Kosina86166b72007-05-14 09:57:40 +020054 while (ret == 0) {
Jiri Kosina86166b72007-05-14 09:57:40 +020055 if (list->head == list->tail) {
56 add_wait_queue(&list->hidraw->wait, &wait);
57 set_current_state(TASK_INTERRUPTIBLE);
58
59 while (list->head == list->tail) {
Jiri Kosina86166b72007-05-14 09:57:40 +020060 if (signal_pending(current)) {
61 ret = -ERESTARTSYS;
62 break;
63 }
64 if (!list->hidraw->exist) {
65 ret = -EIO;
66 break;
67 }
Founder Fang7611e8d2012-11-21 15:20:31 +080068 if (file->f_flags & O_NONBLOCK) {
69 ret = -EAGAIN;
70 break;
71 }
Jiri Kosina86166b72007-05-14 09:57:40 +020072
73 /* allow O_NONBLOCK to work well from other threads */
74 mutex_unlock(&list->read_mutex);
75 schedule();
76 mutex_lock(&list->read_mutex);
77 set_current_state(TASK_INTERRUPTIBLE);
78 }
79
80 set_current_state(TASK_RUNNING);
81 remove_wait_queue(&list->hidraw->wait, &wait);
82 }
83
84 if (ret)
85 goto out;
86
Jiri Kosina86166b72007-05-14 09:57:40 +020087 len = list->buffer[list->tail].len > count ?
88 count : list->buffer[list->tail].len;
89
Jiri Kosinab6787242012-04-27 00:56:08 +020090 if (list->buffer[list->tail].value) {
91 if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
92 ret = -EFAULT;
93 goto out;
94 }
95 ret = len;
Jiri Kosina86166b72007-05-14 09:57:40 +020096 }
Jiri Kosina86166b72007-05-14 09:57:40 +020097
98 kfree(list->buffer[list->tail].value);
Matthieu CASTET4c7b4172012-06-28 16:51:56 +020099 list->buffer[list->tail].value = NULL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200100 list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
101 }
102out:
103 mutex_unlock(&list->read_mutex);
104 return ret;
105}
106
Jiri Kosina61834532014-01-06 16:43:27 +0100107/*
108 * The first byte of the report buffer is expected to be a report number.
109 *
110 * This function is to be called with the minors_lock mutex held.
111 */
Alan Ottb4dbde92011-01-18 03:04:39 -0500112static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type)
Jiri Kosina86166b72007-05-14 09:57:40 +0200113{
Al Viro496ad9a2013-01-23 17:07:38 -0500114 unsigned int minor = iminor(file_inode(file));
Jiri Kosina2e574802010-03-25 14:15:11 +0100115 struct hid_device *dev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200116 __u8 *buf;
117 int ret = 0;
118
Manoj Chourasia212a8712013-07-22 15:33:13 +0530119 if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
Antonio Ospitee42dee92010-10-05 17:20:17 +0200120 ret = -ENODEV;
121 goto out;
122 }
123
Jiri Kosina2e574802010-03-25 14:15:11 +0100124 dev = hidraw_table[minor]->hid;
125
126 if (!dev->hid_output_raw_report) {
127 ret = -ENODEV;
128 goto out;
129 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200130
Jiri Kosina2b107d62008-09-17 19:41:58 +0200131 if (count > HID_MAX_BUFFER_SIZE) {
Joe Perches4291ee32010-12-09 19:29:03 -0800132 hid_warn(dev, "pid %d passed too large report\n",
133 task_pid_nr(current));
Jiri Kosina2e574802010-03-25 14:15:11 +0100134 ret = -EINVAL;
135 goto out;
Jiri Kosina86166b72007-05-14 09:57:40 +0200136 }
137
138 if (count < 2) {
Joe Perches4291ee32010-12-09 19:29:03 -0800139 hid_warn(dev, "pid %d passed too short report\n",
140 task_pid_nr(current));
Jiri Kosina2e574802010-03-25 14:15:11 +0100141 ret = -EINVAL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200142 goto out;
143 }
144
Jiri Kosina2e574802010-03-25 14:15:11 +0100145 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
146 if (!buf) {
147 ret = -ENOMEM;
148 goto out;
149 }
150
151 if (copy_from_user(buf, buffer, count)) {
152 ret = -EFAULT;
153 goto out_free;
154 }
155
Alan Ottb4dbde92011-01-18 03:04:39 -0500156 ret = dev->hid_output_raw_report(dev, buf, count, report_type);
Jiri Kosina2e574802010-03-25 14:15:11 +0100157out_free:
Jiri Kosina86166b72007-05-14 09:57:40 +0200158 kfree(buf);
Jiri Kosina2e574802010-03-25 14:15:11 +0100159out:
Alan Ottb4dbde92011-01-18 03:04:39 -0500160 return ret;
161}
162
Alan Ottb4dbde92011-01-18 03:04:39 -0500163static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
164{
165 ssize_t ret;
166 mutex_lock(&minors_lock);
167 ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT);
Jiri Kosina2e574802010-03-25 14:15:11 +0100168 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200169 return ret;
170}
171
Alan Ottb4dbde92011-01-18 03:04:39 -0500172
Jiri Kosina61834532014-01-06 16:43:27 +0100173/*
174 * This function performs a Get_Report transfer over the control endpoint
Jiri Kosinad2a1cfe2011-03-27 20:29:02 +0200175 * per section 7.2.1 of the HID specification, version 1.1. The first byte
176 * of buffer is the report number to request, or 0x0 if the defice does not
177 * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
Jiri Kosina61834532014-01-06 16:43:27 +0100178 * or HID_INPUT_REPORT.
179 *
180 * This function is to be called with the minors_lock mutex held.
181 */
Alan Ottb4dbde92011-01-18 03:04:39 -0500182static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
183{
Al Viro496ad9a2013-01-23 17:07:38 -0500184 unsigned int minor = iminor(file_inode(file));
Alan Ottb4dbde92011-01-18 03:04:39 -0500185 struct hid_device *dev;
186 __u8 *buf;
187 int ret = 0, len;
188 unsigned char report_number;
189
190 dev = hidraw_table[minor]->hid;
191
192 if (!dev->hid_get_raw_report) {
193 ret = -ENODEV;
194 goto out;
195 }
196
197 if (count > HID_MAX_BUFFER_SIZE) {
198 printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
199 task_pid_nr(current));
200 ret = -EINVAL;
201 goto out;
202 }
203
204 if (count < 2) {
205 printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
206 task_pid_nr(current));
207 ret = -EINVAL;
208 goto out;
209 }
210
211 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
212 if (!buf) {
213 ret = -ENOMEM;
214 goto out;
215 }
216
Jiri Kosina61834532014-01-06 16:43:27 +0100217 /*
218 * Read the first byte from the user. This is the report number,
219 * which is passed to dev->hid_get_raw_report().
220 */
Alan Ottb4dbde92011-01-18 03:04:39 -0500221 if (copy_from_user(&report_number, buffer, 1)) {
222 ret = -EFAULT;
223 goto out_free;
224 }
225
226 ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type);
227
228 if (ret < 0)
229 goto out_free;
230
231 len = (ret < count) ? ret : count;
232
233 if (copy_to_user(buffer, buf, len)) {
234 ret = -EFAULT;
235 goto out_free;
236 }
237
238 ret = len;
239
240out_free:
241 kfree(buf);
242out:
243 return ret;
244}
245
Jiri Kosina86166b72007-05-14 09:57:40 +0200246static unsigned int hidraw_poll(struct file *file, poll_table *wait)
247{
248 struct hidraw_list *list = file->private_data;
249
250 poll_wait(file, &list->hidraw->wait, wait);
251 if (list->head != list->tail)
252 return POLLIN | POLLRDNORM;
253 if (!list->hidraw->exist)
254 return POLLERR | POLLHUP;
255 return 0;
256}
257
258static int hidraw_open(struct inode *inode, struct file *file)
259{
260 unsigned int minor = iminor(inode);
261 struct hidraw *dev;
262 struct hidraw_list *list;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800263 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200264 int err = 0;
265
266 if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
267 err = -ENOMEM;
268 goto out;
269 }
270
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100271 mutex_lock(&minors_lock);
Manoj Chourasia212a8712013-07-22 15:33:13 +0530272 if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
Jiri Kosina86166b72007-05-14 09:57:40 +0200273 err = -ENODEV;
274 goto out_unlock;
275 }
276
Jiri Kosina86166b72007-05-14 09:57:40 +0200277 dev = hidraw_table[minor];
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100278 if (!dev->open++) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800279 err = hid_hw_power(dev->hid, PM_HINT_FULLON);
Amit Nagalf554ff82011-09-27 13:41:58 -0400280 if (err < 0) {
281 dev->open--;
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800282 goto out_unlock;
Amit Nagalf554ff82011-09-27 13:41:58 -0400283 }
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800284
285 err = hid_hw_open(dev->hid);
Oliver Neukum0361a282008-12-17 15:38:03 +0100286 if (err < 0) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800287 hid_hw_power(dev->hid, PM_HINT_NORMAL);
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100288 dev->open--;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800289 goto out_unlock;
Oliver Neukum0361a282008-12-17 15:38:03 +0100290 }
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100291 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200292
Yonghua Zheng277fe442013-08-26 23:38:35 +0800293 list->hidraw = hidraw_table[minor];
294 mutex_init(&list->read_mutex);
295 spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
296 list_add_tail(&list->node, &hidraw_table[minor]->list);
297 spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
298 file->private_data = list;
Jiri Kosina86166b72007-05-14 09:57:40 +0200299out_unlock:
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100300 mutex_unlock(&minors_lock);
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100301out:
Amit Nagal1a896232011-09-07 13:48:47 +0200302 if (err < 0)
303 kfree(list);
Jiri Kosina86166b72007-05-14 09:57:40 +0200304 return err;
305
306}
307
Andrew Dugganb5531312012-11-27 19:02:27 -0800308static int hidraw_fasync(int fd, struct file *file, int on)
309{
310 struct hidraw_list *list = file->private_data;
311
312 return fasync_helper(fd, file, on, &list->fasync);
313}
314
Manoj Chourasia212a8712013-07-22 15:33:13 +0530315static void drop_ref(struct hidraw *hidraw, int exists_bit)
316{
317 if (exists_bit) {
Manoj Chourasia212a8712013-07-22 15:33:13 +0530318 hidraw->exist = 0;
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530319 if (hidraw->open) {
320 hid_hw_close(hidraw->hid);
Manoj Chourasia212a8712013-07-22 15:33:13 +0530321 wake_up_interruptible(&hidraw->wait);
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530322 }
Manoj Chourasia212a8712013-07-22 15:33:13 +0530323 } else {
324 --hidraw->open;
325 }
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530326 if (!hidraw->open) {
327 if (!hidraw->exist) {
328 device_destroy(hidraw_class,
329 MKDEV(hidraw_major, hidraw->minor));
330 hidraw_table[hidraw->minor] = NULL;
331 kfree(hidraw);
332 } else {
333 /* close device for last reader */
334 hid_hw_power(hidraw->hid, PM_HINT_NORMAL);
335 hid_hw_close(hidraw->hid);
336 }
Manoj Chourasia212a8712013-07-22 15:33:13 +0530337 }
338}
339
Jiri Kosina86166b72007-05-14 09:57:40 +0200340static int hidraw_release(struct inode * inode, struct file * file)
341{
342 unsigned int minor = iminor(inode);
Jiri Kosina86166b72007-05-14 09:57:40 +0200343 struct hidraw_list *list = file->private_data;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800344 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200345
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100346 mutex_lock(&minors_lock);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100347
Yonghua Zheng277fe442013-08-26 23:38:35 +0800348 spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200349 list_del(&list->node);
Yonghua Zheng277fe442013-08-26 23:38:35 +0800350 spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
Jiri Kosina4db1c622008-06-24 14:45:27 +0200351 kfree(list);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100352
Manoj Chourasia212a8712013-07-22 15:33:13 +0530353 drop_ref(hidraw_table[minor], 0);
354
355 mutex_unlock(&minors_lock);
356 return 0;
Jiri Kosina86166b72007-05-14 09:57:40 +0200357}
358
Alan Cox979c4072008-05-26 11:25:26 +0200359static long hidraw_ioctl(struct file *file, unsigned int cmd,
360 unsigned long arg)
Jiri Kosina86166b72007-05-14 09:57:40 +0200361{
Al Viro496ad9a2013-01-23 17:07:38 -0500362 struct inode *inode = file_inode(file);
Jiri Kosina86166b72007-05-14 09:57:40 +0200363 unsigned int minor = iminor(inode);
Alan Cox979c4072008-05-26 11:25:26 +0200364 long ret = 0;
Jiri Kosina2e574802010-03-25 14:15:11 +0100365 struct hidraw *dev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200366 void __user *user_arg = (void __user*) arg;
367
Jiri Kosina2e574802010-03-25 14:15:11 +0100368 mutex_lock(&minors_lock);
369 dev = hidraw_table[minor];
Antonio Ospited20d5ff2010-10-05 17:20:16 +0200370 if (!dev) {
371 ret = -ENODEV;
372 goto out;
373 }
Jiri Kosina2e574802010-03-25 14:15:11 +0100374
Jiri Kosina86166b72007-05-14 09:57:40 +0200375 switch (cmd) {
376 case HIDIOCGRDESCSIZE:
377 if (put_user(dev->hid->rsize, (int __user *)arg))
Alan Cox979c4072008-05-26 11:25:26 +0200378 ret = -EFAULT;
379 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200380
381 case HIDIOCGRDESC:
382 {
383 __u32 len;
384
385 if (get_user(len, (int __user *)arg))
Alan Cox979c4072008-05-26 11:25:26 +0200386 ret = -EFAULT;
387 else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
388 ret = -EINVAL;
389 else if (copy_to_user(user_arg + offsetof(
390 struct hidraw_report_descriptor,
391 value[0]),
392 dev->hid->rdesc,
393 min(dev->hid->rsize, len)))
394 ret = -EFAULT;
395 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200396 }
397 case HIDIOCGRAWINFO:
398 {
399 struct hidraw_devinfo dinfo;
400
401 dinfo.bustype = dev->hid->bus;
402 dinfo.vendor = dev->hid->vendor;
403 dinfo.product = dev->hid->product;
404 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
Alan Cox979c4072008-05-26 11:25:26 +0200405 ret = -EFAULT;
406 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200407 }
408 default:
Jiri Kosina9188e792008-11-12 16:14:08 +0100409 {
410 struct hid_device *hid = dev->hid;
Alan Ottb4dbde92011-01-18 03:04:39 -0500411 if (_IOC_TYPE(cmd) != 'H') {
412 ret = -EINVAL;
413 break;
414 }
415
416 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) {
417 int len = _IOC_SIZE(cmd);
418 ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT);
419 break;
420 }
421 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) {
422 int len = _IOC_SIZE(cmd);
423 ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT);
424 break;
425 }
426
427 /* Begin Read-only ioctls. */
428 if (_IOC_DIR(cmd) != _IOC_READ) {
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300429 ret = -EINVAL;
430 break;
431 }
Jiri Kosina9188e792008-11-12 16:14:08 +0100432
433 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
Daniel Mackdd2ed482011-05-15 18:07:42 +0200434 int len = strlen(hid->name) + 1;
Jiri Kosina9188e792008-11-12 16:14:08 +0100435 if (len > _IOC_SIZE(cmd))
436 len = _IOC_SIZE(cmd);
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300437 ret = copy_to_user(user_arg, hid->name, len) ?
Jiri Kosina9188e792008-11-12 16:14:08 +0100438 -EFAULT : len;
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300439 break;
Jiri Kosina9188e792008-11-12 16:14:08 +0100440 }
441
442 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
Daniel Mackdd2ed482011-05-15 18:07:42 +0200443 int len = strlen(hid->phys) + 1;
Jiri Kosina9188e792008-11-12 16:14:08 +0100444 if (len > _IOC_SIZE(cmd))
445 len = _IOC_SIZE(cmd);
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300446 ret = copy_to_user(user_arg, hid->phys, len) ?
Jiri Kosina9188e792008-11-12 16:14:08 +0100447 -EFAULT : len;
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300448 break;
Jiri Kosina9188e792008-11-12 16:14:08 +0100449 }
Alan Ottb4dbde92011-01-18 03:04:39 -0500450 }
Jiri Kosina9188e792008-11-12 16:14:08 +0100451
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300452 ret = -ENOTTY;
Jiri Kosina86166b72007-05-14 09:57:40 +0200453 }
Antonio Ospited20d5ff2010-10-05 17:20:16 +0200454out:
Jiri Kosina2e574802010-03-25 14:15:11 +0100455 mutex_unlock(&minors_lock);
Alan Cox979c4072008-05-26 11:25:26 +0200456 return ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200457}
458
459static const struct file_operations hidraw_ops = {
460 .owner = THIS_MODULE,
461 .read = hidraw_read,
462 .write = hidraw_write,
463 .poll = hidraw_poll,
464 .open = hidraw_open,
465 .release = hidraw_release,
Alan Cox979c4072008-05-26 11:25:26 +0200466 .unlocked_ioctl = hidraw_ioctl,
Andrew Dugganb5531312012-11-27 19:02:27 -0800467 .fasync = hidraw_fasync,
Alan Ottae5e49c2011-01-04 00:37:22 -0500468#ifdef CONFIG_COMPAT
469 .compat_ioctl = hidraw_ioctl,
470#endif
Arnd Bergmann6038f372010-08-15 18:52:59 +0200471 .llseek = noop_llseek,
Jiri Kosina86166b72007-05-14 09:57:40 +0200472};
473
Jiri Kosinab6787242012-04-27 00:56:08 +0200474int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
Jiri Kosina86166b72007-05-14 09:57:40 +0200475{
476 struct hidraw *dev = hid->hidraw;
477 struct hidraw_list *list;
Jiri Kosinab6787242012-04-27 00:56:08 +0200478 int ret = 0;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800479 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200480
Yonghua Zheng277fe442013-08-26 23:38:35 +0800481 spin_lock_irqsave(&dev->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200482 list_for_each_entry(list, &dev->list, node) {
Matthieu CASTET4c7b4172012-06-28 16:51:56 +0200483 int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
484
485 if (new_head == list->tail)
486 continue;
487
Jiri Kosinab6787242012-04-27 00:56:08 +0200488 if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
489 ret = -ENOMEM;
490 break;
491 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200492 list->buffer[list->head].len = len;
Matthieu CASTET4c7b4172012-06-28 16:51:56 +0200493 list->head = new_head;
Jiri Kosina86166b72007-05-14 09:57:40 +0200494 kill_fasync(&list->fasync, SIGIO, POLL_IN);
495 }
Yonghua Zheng277fe442013-08-26 23:38:35 +0800496 spin_unlock_irqrestore(&dev->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200497
498 wake_up_interruptible(&dev->wait);
Jiri Kosinab6787242012-04-27 00:56:08 +0200499 return ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200500}
501EXPORT_SYMBOL_GPL(hidraw_report_event);
502
503int hidraw_connect(struct hid_device *hid)
504{
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200505 int minor, result;
Jiri Kosina86166b72007-05-14 09:57:40 +0200506 struct hidraw *dev;
507
Jiri Kosina61834532014-01-06 16:43:27 +0100508 /* we accept any HID device, all applications */
Jiri Kosina86166b72007-05-14 09:57:40 +0200509
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200510 dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
511 if (!dev)
512 return -ENOMEM;
513
514 result = -EINVAL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200515
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100516 mutex_lock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200517
518 for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
519 if (hidraw_table[minor])
520 continue;
521 hidraw_table[minor] = dev;
522 result = 0;
523 break;
524 }
525
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200526 if (result) {
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100527 mutex_unlock(&minors_lock);
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200528 kfree(dev);
Jiri Kosina86166b72007-05-14 09:57:40 +0200529 goto out;
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200530 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200531
Jiri Kosinaaae6c282008-12-04 16:16:46 +0100532 dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
Greg Kroah-Hartmana9b12612008-07-21 20:03:34 -0700533 NULL, "%s%d", "hidraw", minor);
Jiri Kosina86166b72007-05-14 09:57:40 +0200534
535 if (IS_ERR(dev->dev)) {
Jiri Kosina86166b72007-05-14 09:57:40 +0200536 hidraw_table[minor] = NULL;
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100537 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200538 result = PTR_ERR(dev->dev);
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200539 kfree(dev);
Jiri Kosina86166b72007-05-14 09:57:40 +0200540 goto out;
541 }
542
543 init_waitqueue_head(&dev->wait);
Yonghua Zheng277fe442013-08-26 23:38:35 +0800544 spin_lock_init(&dev->list_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200545 INIT_LIST_HEAD(&dev->list);
546
547 dev->hid = hid;
548 dev->minor = minor;
549
550 dev->exist = 1;
551 hid->hidraw = dev;
552
Yonghua Zheng8e552e52013-07-30 14:16:10 +0800553 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200554out:
555 return result;
556
557}
558EXPORT_SYMBOL_GPL(hidraw_connect);
559
560void hidraw_disconnect(struct hid_device *hid)
561{
562 struct hidraw *hidraw = hid->hidraw;
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100563
564 mutex_lock(&minors_lock);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100565
Manoj Chourasia212a8712013-07-22 15:33:13 +0530566 drop_ref(hidraw, 1);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100567
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100568 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200569}
570EXPORT_SYMBOL_GPL(hidraw_disconnect);
571
572int __init hidraw_init(void)
573{
574 int result;
575 dev_t dev_id;
576
577 result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
578 HIDRAW_MAX_DEVICES, "hidraw");
579
580 hidraw_major = MAJOR(dev_id);
581
582 if (result < 0) {
Joe Perches4291ee32010-12-09 19:29:03 -0800583 pr_warn("can't get major number\n");
Jiri Kosina86166b72007-05-14 09:57:40 +0200584 goto out;
585 }
586
587 hidraw_class = class_create(THIS_MODULE, "hidraw");
588 if (IS_ERR(hidraw_class)) {
589 result = PTR_ERR(hidraw_class);
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400590 goto error_cdev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200591 }
592
593 cdev_init(&hidraw_cdev, &hidraw_ops);
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400594 result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
595 if (result < 0)
596 goto error_class;
597
Jiri Kosina0f690cc2013-02-19 14:05:34 +0100598 printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n");
Jiri Kosina86166b72007-05-14 09:57:40 +0200599out:
600 return result;
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400601
602error_class:
603 class_destroy(hidraw_class);
604error_cdev:
605 unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
606 goto out;
Jiri Kosina86166b72007-05-14 09:57:40 +0200607}
608
Jiri Slaby140ae3e2008-10-17 18:04:48 +0200609void hidraw_exit(void)
Jiri Kosina86166b72007-05-14 09:57:40 +0200610{
611 dev_t dev_id = MKDEV(hidraw_major, 0);
612
613 cdev_del(&hidraw_cdev);
614 class_destroy(hidraw_class);
615 unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
616
617}