blob: c79578b5a788f48ba74ec9aa2df5c82b8385b882 [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 *
9 * Copyright (c) 2007 Jiri Kosina
10 */
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) {
60 if (file->f_flags & O_NONBLOCK) {
61 ret = -EAGAIN;
62 break;
63 }
64 if (signal_pending(current)) {
65 ret = -ERESTARTSYS;
66 break;
67 }
68 if (!list->hidraw->exist) {
69 ret = -EIO;
70 break;
71 }
72
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
90 if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
91 ret = -EFAULT;
92 goto out;
93 }
Alan Ottcf28a672011-01-26 22:25:18 -050094 ret = len;
Jiri Kosina86166b72007-05-14 09:57:40 +020095
96 kfree(list->buffer[list->tail].value);
97 list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
98 }
99out:
100 mutex_unlock(&list->read_mutex);
101 return ret;
102}
103
Jiri Kosinad2a1cfe2011-03-27 20:29:02 +0200104/* The first byte is expected to be a report number.
105 * This function is to be called with the minors_lock mutex held */
Alan Ottb4dbde92011-01-18 03:04:39 -0500106static 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 +0200107{
108 unsigned int minor = iminor(file->f_path.dentry->d_inode);
Jiri Kosina2e574802010-03-25 14:15:11 +0100109 struct hid_device *dev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200110 __u8 *buf;
111 int ret = 0;
112
Antonio Ospitee42dee92010-10-05 17:20:17 +0200113 if (!hidraw_table[minor]) {
114 ret = -ENODEV;
115 goto out;
116 }
117
Jiri Kosina2e574802010-03-25 14:15:11 +0100118 dev = hidraw_table[minor]->hid;
119
120 if (!dev->hid_output_raw_report) {
121 ret = -ENODEV;
122 goto out;
123 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200124
Jiri Kosina2b107d62008-09-17 19:41:58 +0200125 if (count > HID_MAX_BUFFER_SIZE) {
Joe Perches4291ee32010-12-09 19:29:03 -0800126 hid_warn(dev, "pid %d passed too large report\n",
127 task_pid_nr(current));
Jiri Kosina2e574802010-03-25 14:15:11 +0100128 ret = -EINVAL;
129 goto out;
Jiri Kosina86166b72007-05-14 09:57:40 +0200130 }
131
132 if (count < 2) {
Joe Perches4291ee32010-12-09 19:29:03 -0800133 hid_warn(dev, "pid %d passed too short report\n",
134 task_pid_nr(current));
Jiri Kosina2e574802010-03-25 14:15:11 +0100135 ret = -EINVAL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200136 goto out;
137 }
138
Jiri Kosina2e574802010-03-25 14:15:11 +0100139 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
140 if (!buf) {
141 ret = -ENOMEM;
142 goto out;
143 }
144
145 if (copy_from_user(buf, buffer, count)) {
146 ret = -EFAULT;
147 goto out_free;
148 }
149
Alan Ottb4dbde92011-01-18 03:04:39 -0500150 ret = dev->hid_output_raw_report(dev, buf, count, report_type);
Jiri Kosina2e574802010-03-25 14:15:11 +0100151out_free:
Jiri Kosina86166b72007-05-14 09:57:40 +0200152 kfree(buf);
Jiri Kosina2e574802010-03-25 14:15:11 +0100153out:
Alan Ottb4dbde92011-01-18 03:04:39 -0500154 return ret;
155}
156
157/* the first byte is expected to be a report number */
158static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
159{
160 ssize_t ret;
161 mutex_lock(&minors_lock);
162 ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT);
Jiri Kosina2e574802010-03-25 14:15:11 +0100163 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200164 return ret;
165}
166
Alan Ottb4dbde92011-01-18 03:04:39 -0500167
168/* This function performs a Get_Report transfer over the control endpoint
Jiri Kosinad2a1cfe2011-03-27 20:29:02 +0200169 * per section 7.2.1 of the HID specification, version 1.1. The first byte
170 * of buffer is the report number to request, or 0x0 if the defice does not
171 * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
172 * or HID_INPUT_REPORT. This function is to be called with the minors_lock
173 * mutex held. */
Alan Ottb4dbde92011-01-18 03:04:39 -0500174static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
175{
176 unsigned int minor = iminor(file->f_path.dentry->d_inode);
177 struct hid_device *dev;
178 __u8 *buf;
179 int ret = 0, len;
180 unsigned char report_number;
181
182 dev = hidraw_table[minor]->hid;
183
184 if (!dev->hid_get_raw_report) {
185 ret = -ENODEV;
186 goto out;
187 }
188
189 if (count > HID_MAX_BUFFER_SIZE) {
190 printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
191 task_pid_nr(current));
192 ret = -EINVAL;
193 goto out;
194 }
195
196 if (count < 2) {
197 printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
198 task_pid_nr(current));
199 ret = -EINVAL;
200 goto out;
201 }
202
203 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
204 if (!buf) {
205 ret = -ENOMEM;
206 goto out;
207 }
208
209 /* Read the first byte from the user. This is the report number,
Jiri Kosinad2a1cfe2011-03-27 20:29:02 +0200210 * which is passed to dev->hid_get_raw_report(). */
Alan Ottb4dbde92011-01-18 03:04:39 -0500211 if (copy_from_user(&report_number, buffer, 1)) {
212 ret = -EFAULT;
213 goto out_free;
214 }
215
216 ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type);
217
218 if (ret < 0)
219 goto out_free;
220
221 len = (ret < count) ? ret : count;
222
223 if (copy_to_user(buffer, buf, len)) {
224 ret = -EFAULT;
225 goto out_free;
226 }
227
228 ret = len;
229
230out_free:
231 kfree(buf);
232out:
233 return ret;
234}
235
Jiri Kosina86166b72007-05-14 09:57:40 +0200236static unsigned int hidraw_poll(struct file *file, poll_table *wait)
237{
238 struct hidraw_list *list = file->private_data;
239
240 poll_wait(file, &list->hidraw->wait, wait);
241 if (list->head != list->tail)
242 return POLLIN | POLLRDNORM;
243 if (!list->hidraw->exist)
244 return POLLERR | POLLHUP;
245 return 0;
246}
247
248static int hidraw_open(struct inode *inode, struct file *file)
249{
250 unsigned int minor = iminor(inode);
251 struct hidraw *dev;
252 struct hidraw_list *list;
253 int err = 0;
254
255 if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
256 err = -ENOMEM;
257 goto out;
258 }
259
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100260 mutex_lock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200261 if (!hidraw_table[minor]) {
Jiri Kosina86166b72007-05-14 09:57:40 +0200262 kfree(list);
263 err = -ENODEV;
264 goto out_unlock;
265 }
266
267 list->hidraw = hidraw_table[minor];
268 mutex_init(&list->read_mutex);
269 list_add_tail(&list->node, &hidraw_table[minor]->list);
270 file->private_data = list;
271
272 dev = hidraw_table[minor];
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100273 if (!dev->open++) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800274 err = hid_hw_power(dev->hid, PM_HINT_FULLON);
275 if (err < 0)
276 goto out_unlock;
277
278 err = hid_hw_open(dev->hid);
Oliver Neukum0361a282008-12-17 15:38:03 +0100279 if (err < 0) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800280 hid_hw_power(dev->hid, PM_HINT_NORMAL);
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100281 dev->open--;
Oliver Neukum0361a282008-12-17 15:38:03 +0100282 }
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100283 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200284
285out_unlock:
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100286 mutex_unlock(&minors_lock);
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100287out:
Jiri Kosina86166b72007-05-14 09:57:40 +0200288 return err;
289
290}
291
292static int hidraw_release(struct inode * inode, struct file * file)
293{
294 unsigned int minor = iminor(inode);
295 struct hidraw *dev;
296 struct hidraw_list *list = file->private_data;
Jiri Slabycb174682010-10-19 11:29:55 +0200297 int ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200298
Jiri Slabycb174682010-10-19 11:29:55 +0200299 mutex_lock(&minors_lock);
300 if (!hidraw_table[minor]) {
301 ret = -ENODEV;
302 goto unlock;
303 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200304
305 list_del(&list->node);
306 dev = hidraw_table[minor];
Oliver Neukumb8a832b2008-12-15 13:12:08 +0100307 if (!--dev->open) {
Oliver Neukum0361a282008-12-17 15:38:03 +0100308 if (list->hidraw->exist) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800309 hid_hw_power(dev->hid, PM_HINT_NORMAL);
310 hid_hw_close(dev->hid);
Oliver Neukum0361a282008-12-17 15:38:03 +0100311 } else {
Jiri Kosina86166b72007-05-14 09:57:40 +0200312 kfree(list->hidraw);
Oliver Neukum0361a282008-12-17 15:38:03 +0100313 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200314 }
Jiri Kosina4db1c622008-06-24 14:45:27 +0200315 kfree(list);
Jiri Slabycb174682010-10-19 11:29:55 +0200316 ret = 0;
317unlock:
318 mutex_unlock(&minors_lock);
Jiri Kosina4db1c622008-06-24 14:45:27 +0200319
Jiri Slabycb174682010-10-19 11:29:55 +0200320 return ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200321}
322
Alan Cox979c4072008-05-26 11:25:26 +0200323static long hidraw_ioctl(struct file *file, unsigned int cmd,
324 unsigned long arg)
Jiri Kosina86166b72007-05-14 09:57:40 +0200325{
Alan Cox979c4072008-05-26 11:25:26 +0200326 struct inode *inode = file->f_path.dentry->d_inode;
Jiri Kosina86166b72007-05-14 09:57:40 +0200327 unsigned int minor = iminor(inode);
Alan Cox979c4072008-05-26 11:25:26 +0200328 long ret = 0;
Jiri Kosina2e574802010-03-25 14:15:11 +0100329 struct hidraw *dev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200330 void __user *user_arg = (void __user*) arg;
331
Jiri Kosina2e574802010-03-25 14:15:11 +0100332 mutex_lock(&minors_lock);
333 dev = hidraw_table[minor];
Antonio Ospited20d5ff2010-10-05 17:20:16 +0200334 if (!dev) {
335 ret = -ENODEV;
336 goto out;
337 }
Jiri Kosina2e574802010-03-25 14:15:11 +0100338
Jiri Kosina86166b72007-05-14 09:57:40 +0200339 switch (cmd) {
340 case HIDIOCGRDESCSIZE:
341 if (put_user(dev->hid->rsize, (int __user *)arg))
Alan Cox979c4072008-05-26 11:25:26 +0200342 ret = -EFAULT;
343 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200344
345 case HIDIOCGRDESC:
346 {
347 __u32 len;
348
349 if (get_user(len, (int __user *)arg))
Alan Cox979c4072008-05-26 11:25:26 +0200350 ret = -EFAULT;
351 else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
352 ret = -EINVAL;
353 else if (copy_to_user(user_arg + offsetof(
354 struct hidraw_report_descriptor,
355 value[0]),
356 dev->hid->rdesc,
357 min(dev->hid->rsize, len)))
358 ret = -EFAULT;
359 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200360 }
361 case HIDIOCGRAWINFO:
362 {
363 struct hidraw_devinfo dinfo;
364
365 dinfo.bustype = dev->hid->bus;
366 dinfo.vendor = dev->hid->vendor;
367 dinfo.product = dev->hid->product;
368 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
Alan Cox979c4072008-05-26 11:25:26 +0200369 ret = -EFAULT;
370 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200371 }
372 default:
Jiri Kosina9188e792008-11-12 16:14:08 +0100373 {
374 struct hid_device *hid = dev->hid;
Alan Ottb4dbde92011-01-18 03:04:39 -0500375 if (_IOC_TYPE(cmd) != 'H') {
376 ret = -EINVAL;
377 break;
378 }
379
380 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) {
381 int len = _IOC_SIZE(cmd);
382 ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT);
383 break;
384 }
385 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) {
386 int len = _IOC_SIZE(cmd);
387 ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT);
388 break;
389 }
390
391 /* Begin Read-only ioctls. */
392 if (_IOC_DIR(cmd) != _IOC_READ) {
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300393 ret = -EINVAL;
394 break;
395 }
Jiri Kosina9188e792008-11-12 16:14:08 +0100396
397 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
Daniel Mackdd2ed482011-05-15 18:07:42 +0200398 int len = strlen(hid->name) + 1;
Jiri Kosina9188e792008-11-12 16:14:08 +0100399 if (len > _IOC_SIZE(cmd))
400 len = _IOC_SIZE(cmd);
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300401 ret = copy_to_user(user_arg, hid->name, len) ?
Jiri Kosina9188e792008-11-12 16:14:08 +0100402 -EFAULT : len;
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300403 break;
Jiri Kosina9188e792008-11-12 16:14:08 +0100404 }
405
406 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
Daniel Mackdd2ed482011-05-15 18:07:42 +0200407 int len = strlen(hid->phys) + 1;
Jiri Kosina9188e792008-11-12 16:14:08 +0100408 if (len > _IOC_SIZE(cmd))
409 len = _IOC_SIZE(cmd);
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300410 ret = copy_to_user(user_arg, hid->phys, len) ?
Jiri Kosina9188e792008-11-12 16:14:08 +0100411 -EFAULT : len;
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300412 break;
Jiri Kosina9188e792008-11-12 16:14:08 +0100413 }
Alan Ottb4dbde92011-01-18 03:04:39 -0500414 }
Jiri Kosina9188e792008-11-12 16:14:08 +0100415
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300416 ret = -ENOTTY;
Jiri Kosina86166b72007-05-14 09:57:40 +0200417 }
Antonio Ospited20d5ff2010-10-05 17:20:16 +0200418out:
Jiri Kosina2e574802010-03-25 14:15:11 +0100419 mutex_unlock(&minors_lock);
Alan Cox979c4072008-05-26 11:25:26 +0200420 return ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200421}
422
423static const struct file_operations hidraw_ops = {
424 .owner = THIS_MODULE,
425 .read = hidraw_read,
426 .write = hidraw_write,
427 .poll = hidraw_poll,
428 .open = hidraw_open,
429 .release = hidraw_release,
Alan Cox979c4072008-05-26 11:25:26 +0200430 .unlocked_ioctl = hidraw_ioctl,
Alan Ottae5e49c2011-01-04 00:37:22 -0500431#ifdef CONFIG_COMPAT
432 .compat_ioctl = hidraw_ioctl,
433#endif
Arnd Bergmann6038f372010-08-15 18:52:59 +0200434 .llseek = noop_llseek,
Jiri Kosina86166b72007-05-14 09:57:40 +0200435};
436
437void hidraw_report_event(struct hid_device *hid, u8 *data, int len)
438{
439 struct hidraw *dev = hid->hidraw;
440 struct hidraw_list *list;
441
442 list_for_each_entry(list, &dev->list, node) {
443 list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC);
444 list->buffer[list->head].len = len;
445 list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
446 kill_fasync(&list->fasync, SIGIO, POLL_IN);
447 }
448
449 wake_up_interruptible(&dev->wait);
450}
451EXPORT_SYMBOL_GPL(hidraw_report_event);
452
453int hidraw_connect(struct hid_device *hid)
454{
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200455 int minor, result;
Jiri Kosina86166b72007-05-14 09:57:40 +0200456 struct hidraw *dev;
457
Jiri Kosinabbe281f2009-06-04 15:44:25 +0200458 /* we accept any HID device, no matter the applications */
Jiri Kosina86166b72007-05-14 09:57:40 +0200459
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200460 dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
461 if (!dev)
462 return -ENOMEM;
463
464 result = -EINVAL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200465
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100466 mutex_lock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200467
468 for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
469 if (hidraw_table[minor])
470 continue;
471 hidraw_table[minor] = dev;
472 result = 0;
473 break;
474 }
475
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200476 if (result) {
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100477 mutex_unlock(&minors_lock);
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200478 kfree(dev);
Jiri Kosina86166b72007-05-14 09:57:40 +0200479 goto out;
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200480 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200481
Jiri Kosinaaae6c282008-12-04 16:16:46 +0100482 dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
Greg Kroah-Hartmana9b12612008-07-21 20:03:34 -0700483 NULL, "%s%d", "hidraw", minor);
Jiri Kosina86166b72007-05-14 09:57:40 +0200484
485 if (IS_ERR(dev->dev)) {
Jiri Kosina86166b72007-05-14 09:57:40 +0200486 hidraw_table[minor] = NULL;
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100487 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200488 result = PTR_ERR(dev->dev);
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200489 kfree(dev);
Jiri Kosina86166b72007-05-14 09:57:40 +0200490 goto out;
491 }
492
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100493 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200494 init_waitqueue_head(&dev->wait);
495 INIT_LIST_HEAD(&dev->list);
496
497 dev->hid = hid;
498 dev->minor = minor;
499
500 dev->exist = 1;
501 hid->hidraw = dev;
502
503out:
504 return result;
505
506}
507EXPORT_SYMBOL_GPL(hidraw_connect);
508
509void hidraw_disconnect(struct hid_device *hid)
510{
511 struct hidraw *hidraw = hid->hidraw;
512
513 hidraw->exist = 0;
514
Stefan Achatz3a22ebe2011-01-29 02:17:30 +0100515 device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
516
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100517 mutex_lock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200518 hidraw_table[hidraw->minor] = NULL;
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100519 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200520
Jiri Kosina86166b72007-05-14 09:57:40 +0200521 if (hidraw->open) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800522 hid_hw_close(hid);
Jiri Kosina86166b72007-05-14 09:57:40 +0200523 wake_up_interruptible(&hidraw->wait);
524 } else {
525 kfree(hidraw);
526 }
527}
528EXPORT_SYMBOL_GPL(hidraw_disconnect);
529
530int __init hidraw_init(void)
531{
532 int result;
533 dev_t dev_id;
534
535 result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
536 HIDRAW_MAX_DEVICES, "hidraw");
537
538 hidraw_major = MAJOR(dev_id);
539
540 if (result < 0) {
Joe Perches4291ee32010-12-09 19:29:03 -0800541 pr_warn("can't get major number\n");
Jiri Kosina86166b72007-05-14 09:57:40 +0200542 result = 0;
543 goto out;
544 }
545
546 hidraw_class = class_create(THIS_MODULE, "hidraw");
547 if (IS_ERR(hidraw_class)) {
548 result = PTR_ERR(hidraw_class);
549 unregister_chrdev(hidraw_major, "hidraw");
550 goto out;
551 }
552
553 cdev_init(&hidraw_cdev, &hidraw_ops);
554 cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
555out:
556 return result;
557}
558
Jiri Slaby140ae3e2008-10-17 18:04:48 +0200559void hidraw_exit(void)
Jiri Kosina86166b72007-05-14 09:57:40 +0200560{
561 dev_t dev_id = MKDEV(hidraw_major, 0);
562
563 cdev_del(&hidraw_cdev);
564 class_destroy(hidraw_class);
565 unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
566
567}