blob: 6a6dd5cd783343c0804f26311674458a19d6519b [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) {
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 Kosinad2a1cfe2011-03-27 20:29:02 +0200107/* The first byte is expected to be a report number.
108 * This function is to be called with the minors_lock mutex held */
Alan Ottb4dbde92011-01-18 03:04:39 -0500109static 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 +0200110{
Al Viro496ad9a2013-01-23 17:07:38 -0500111 unsigned int minor = iminor(file_inode(file));
Jiri Kosina2e574802010-03-25 14:15:11 +0100112 struct hid_device *dev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200113 __u8 *buf;
114 int ret = 0;
115
Manoj Chourasia212a8712013-07-22 15:33:13 +0530116 if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
Antonio Ospitee42dee92010-10-05 17:20:17 +0200117 ret = -ENODEV;
118 goto out;
119 }
120
Jiri Kosina2e574802010-03-25 14:15:11 +0100121 dev = hidraw_table[minor]->hid;
122
123 if (!dev->hid_output_raw_report) {
124 ret = -ENODEV;
125 goto out;
126 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200127
Jiri Kosina2b107d62008-09-17 19:41:58 +0200128 if (count > HID_MAX_BUFFER_SIZE) {
Joe Perches4291ee32010-12-09 19:29:03 -0800129 hid_warn(dev, "pid %d passed too large report\n",
130 task_pid_nr(current));
Jiri Kosina2e574802010-03-25 14:15:11 +0100131 ret = -EINVAL;
132 goto out;
Jiri Kosina86166b72007-05-14 09:57:40 +0200133 }
134
135 if (count < 2) {
Joe Perches4291ee32010-12-09 19:29:03 -0800136 hid_warn(dev, "pid %d passed too short report\n",
137 task_pid_nr(current));
Jiri Kosina2e574802010-03-25 14:15:11 +0100138 ret = -EINVAL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200139 goto out;
140 }
141
Jiri Kosina2e574802010-03-25 14:15:11 +0100142 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
143 if (!buf) {
144 ret = -ENOMEM;
145 goto out;
146 }
147
148 if (copy_from_user(buf, buffer, count)) {
149 ret = -EFAULT;
150 goto out_free;
151 }
152
Alan Ottb4dbde92011-01-18 03:04:39 -0500153 ret = dev->hid_output_raw_report(dev, buf, count, report_type);
Jiri Kosina2e574802010-03-25 14:15:11 +0100154out_free:
Jiri Kosina86166b72007-05-14 09:57:40 +0200155 kfree(buf);
Jiri Kosina2e574802010-03-25 14:15:11 +0100156out:
Alan Ottb4dbde92011-01-18 03:04:39 -0500157 return ret;
158}
159
160/* the first byte is expected to be a report number */
161static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
162{
163 ssize_t ret;
164 mutex_lock(&minors_lock);
165 ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT);
Jiri Kosina2e574802010-03-25 14:15:11 +0100166 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200167 return ret;
168}
169
Alan Ottb4dbde92011-01-18 03:04:39 -0500170
171/* This function performs a Get_Report transfer over the control endpoint
Jiri Kosinad2a1cfe2011-03-27 20:29:02 +0200172 * per section 7.2.1 of the HID specification, version 1.1. The first byte
173 * of buffer is the report number to request, or 0x0 if the defice does not
174 * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
175 * or HID_INPUT_REPORT. This function is to be called with the minors_lock
176 * mutex held. */
Alan Ottb4dbde92011-01-18 03:04:39 -0500177static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
178{
Al Viro496ad9a2013-01-23 17:07:38 -0500179 unsigned int minor = iminor(file_inode(file));
Alan Ottb4dbde92011-01-18 03:04:39 -0500180 struct hid_device *dev;
181 __u8 *buf;
182 int ret = 0, len;
183 unsigned char report_number;
184
185 dev = hidraw_table[minor]->hid;
186
187 if (!dev->hid_get_raw_report) {
188 ret = -ENODEV;
189 goto out;
190 }
191
192 if (count > HID_MAX_BUFFER_SIZE) {
193 printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
194 task_pid_nr(current));
195 ret = -EINVAL;
196 goto out;
197 }
198
199 if (count < 2) {
200 printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
201 task_pid_nr(current));
202 ret = -EINVAL;
203 goto out;
204 }
205
206 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
207 if (!buf) {
208 ret = -ENOMEM;
209 goto out;
210 }
211
212 /* Read the first byte from the user. This is the report number,
Jiri Kosinad2a1cfe2011-03-27 20:29:02 +0200213 * which is passed to dev->hid_get_raw_report(). */
Alan Ottb4dbde92011-01-18 03:04:39 -0500214 if (copy_from_user(&report_number, buffer, 1)) {
215 ret = -EFAULT;
216 goto out_free;
217 }
218
219 ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type);
220
221 if (ret < 0)
222 goto out_free;
223
224 len = (ret < count) ? ret : count;
225
226 if (copy_to_user(buffer, buf, len)) {
227 ret = -EFAULT;
228 goto out_free;
229 }
230
231 ret = len;
232
233out_free:
234 kfree(buf);
235out:
236 return ret;
237}
238
Jiri Kosina86166b72007-05-14 09:57:40 +0200239static unsigned int hidraw_poll(struct file *file, poll_table *wait)
240{
241 struct hidraw_list *list = file->private_data;
242
243 poll_wait(file, &list->hidraw->wait, wait);
244 if (list->head != list->tail)
245 return POLLIN | POLLRDNORM;
246 if (!list->hidraw->exist)
247 return POLLERR | POLLHUP;
248 return 0;
249}
250
251static int hidraw_open(struct inode *inode, struct file *file)
252{
253 unsigned int minor = iminor(inode);
254 struct hidraw *dev;
255 struct hidraw_list *list;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800256 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200257 int err = 0;
258
259 if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
260 err = -ENOMEM;
261 goto out;
262 }
263
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100264 mutex_lock(&minors_lock);
Manoj Chourasia212a8712013-07-22 15:33:13 +0530265 if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
Jiri Kosina86166b72007-05-14 09:57:40 +0200266 err = -ENODEV;
267 goto out_unlock;
268 }
269
Jiri Kosina86166b72007-05-14 09:57:40 +0200270 dev = hidraw_table[minor];
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100271 if (!dev->open++) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800272 err = hid_hw_power(dev->hid, PM_HINT_FULLON);
Amit Nagalf554ff82011-09-27 13:41:58 -0400273 if (err < 0) {
274 dev->open--;
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800275 goto out_unlock;
Amit Nagalf554ff82011-09-27 13:41:58 -0400276 }
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800277
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--;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800282 goto out_unlock;
Oliver Neukum0361a282008-12-17 15:38:03 +0100283 }
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100284 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200285
Yonghua Zheng277fe442013-08-26 23:38:35 +0800286 list->hidraw = hidraw_table[minor];
287 mutex_init(&list->read_mutex);
288 spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
289 list_add_tail(&list->node, &hidraw_table[minor]->list);
290 spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
291 file->private_data = list;
Jiri Kosina86166b72007-05-14 09:57:40 +0200292out_unlock:
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100293 mutex_unlock(&minors_lock);
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100294out:
Amit Nagal1a896232011-09-07 13:48:47 +0200295 if (err < 0)
296 kfree(list);
Jiri Kosina86166b72007-05-14 09:57:40 +0200297 return err;
298
299}
300
Andrew Dugganb5531312012-11-27 19:02:27 -0800301static int hidraw_fasync(int fd, struct file *file, int on)
302{
303 struct hidraw_list *list = file->private_data;
304
305 return fasync_helper(fd, file, on, &list->fasync);
306}
307
Manoj Chourasia212a8712013-07-22 15:33:13 +0530308static void drop_ref(struct hidraw *hidraw, int exists_bit)
309{
310 if (exists_bit) {
Manoj Chourasia212a8712013-07-22 15:33:13 +0530311 hidraw->exist = 0;
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530312 if (hidraw->open) {
313 hid_hw_close(hidraw->hid);
Manoj Chourasia212a8712013-07-22 15:33:13 +0530314 wake_up_interruptible(&hidraw->wait);
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530315 }
Manoj Chourasia212a8712013-07-22 15:33:13 +0530316 } else {
317 --hidraw->open;
318 }
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530319 if (!hidraw->open) {
320 if (!hidraw->exist) {
321 device_destroy(hidraw_class,
322 MKDEV(hidraw_major, hidraw->minor));
323 hidraw_table[hidraw->minor] = NULL;
324 kfree(hidraw);
325 } else {
326 /* close device for last reader */
327 hid_hw_power(hidraw->hid, PM_HINT_NORMAL);
328 hid_hw_close(hidraw->hid);
329 }
Manoj Chourasia212a8712013-07-22 15:33:13 +0530330 }
331}
332
Jiri Kosina86166b72007-05-14 09:57:40 +0200333static int hidraw_release(struct inode * inode, struct file * file)
334{
335 unsigned int minor = iminor(inode);
Jiri Kosina86166b72007-05-14 09:57:40 +0200336 struct hidraw_list *list = file->private_data;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800337 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200338
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100339 mutex_lock(&minors_lock);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100340
Yonghua Zheng277fe442013-08-26 23:38:35 +0800341 spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200342 list_del(&list->node);
Yonghua Zheng277fe442013-08-26 23:38:35 +0800343 spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
Jiri Kosina4db1c622008-06-24 14:45:27 +0200344 kfree(list);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100345
Manoj Chourasia212a8712013-07-22 15:33:13 +0530346 drop_ref(hidraw_table[minor], 0);
347
348 mutex_unlock(&minors_lock);
349 return 0;
Jiri Kosina86166b72007-05-14 09:57:40 +0200350}
351
Alan Cox979c4072008-05-26 11:25:26 +0200352static long hidraw_ioctl(struct file *file, unsigned int cmd,
353 unsigned long arg)
Jiri Kosina86166b72007-05-14 09:57:40 +0200354{
Al Viro496ad9a2013-01-23 17:07:38 -0500355 struct inode *inode = file_inode(file);
Jiri Kosina86166b72007-05-14 09:57:40 +0200356 unsigned int minor = iminor(inode);
Alan Cox979c4072008-05-26 11:25:26 +0200357 long ret = 0;
Jiri Kosina2e574802010-03-25 14:15:11 +0100358 struct hidraw *dev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200359 void __user *user_arg = (void __user*) arg;
360
Jiri Kosina2e574802010-03-25 14:15:11 +0100361 mutex_lock(&minors_lock);
362 dev = hidraw_table[minor];
Antonio Ospited20d5ff2010-10-05 17:20:16 +0200363 if (!dev) {
364 ret = -ENODEV;
365 goto out;
366 }
Jiri Kosina2e574802010-03-25 14:15:11 +0100367
Jiri Kosina86166b72007-05-14 09:57:40 +0200368 switch (cmd) {
369 case HIDIOCGRDESCSIZE:
370 if (put_user(dev->hid->rsize, (int __user *)arg))
Alan Cox979c4072008-05-26 11:25:26 +0200371 ret = -EFAULT;
372 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200373
374 case HIDIOCGRDESC:
375 {
376 __u32 len;
377
378 if (get_user(len, (int __user *)arg))
Alan Cox979c4072008-05-26 11:25:26 +0200379 ret = -EFAULT;
380 else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
381 ret = -EINVAL;
382 else if (copy_to_user(user_arg + offsetof(
383 struct hidraw_report_descriptor,
384 value[0]),
385 dev->hid->rdesc,
386 min(dev->hid->rsize, len)))
387 ret = -EFAULT;
388 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200389 }
390 case HIDIOCGRAWINFO:
391 {
392 struct hidraw_devinfo dinfo;
393
394 dinfo.bustype = dev->hid->bus;
395 dinfo.vendor = dev->hid->vendor;
396 dinfo.product = dev->hid->product;
397 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
Alan Cox979c4072008-05-26 11:25:26 +0200398 ret = -EFAULT;
399 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200400 }
401 default:
Jiri Kosina9188e792008-11-12 16:14:08 +0100402 {
403 struct hid_device *hid = dev->hid;
Alan Ottb4dbde92011-01-18 03:04:39 -0500404 if (_IOC_TYPE(cmd) != 'H') {
405 ret = -EINVAL;
406 break;
407 }
408
409 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) {
410 int len = _IOC_SIZE(cmd);
411 ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT);
412 break;
413 }
414 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) {
415 int len = _IOC_SIZE(cmd);
416 ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT);
417 break;
418 }
419
420 /* Begin Read-only ioctls. */
421 if (_IOC_DIR(cmd) != _IOC_READ) {
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300422 ret = -EINVAL;
423 break;
424 }
Jiri Kosina9188e792008-11-12 16:14:08 +0100425
426 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
Daniel Mackdd2ed4872011-05-15 18:07:42 +0200427 int len = strlen(hid->name) + 1;
Jiri Kosina9188e792008-11-12 16:14:08 +0100428 if (len > _IOC_SIZE(cmd))
429 len = _IOC_SIZE(cmd);
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300430 ret = copy_to_user(user_arg, hid->name, len) ?
Jiri Kosina9188e792008-11-12 16:14:08 +0100431 -EFAULT : len;
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300432 break;
Jiri Kosina9188e792008-11-12 16:14:08 +0100433 }
434
435 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
Daniel Mackdd2ed4872011-05-15 18:07:42 +0200436 int len = strlen(hid->phys) + 1;
Jiri Kosina9188e792008-11-12 16:14:08 +0100437 if (len > _IOC_SIZE(cmd))
438 len = _IOC_SIZE(cmd);
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300439 ret = copy_to_user(user_arg, hid->phys, len) ?
Jiri Kosina9188e792008-11-12 16:14:08 +0100440 -EFAULT : len;
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300441 break;
Jiri Kosina9188e792008-11-12 16:14:08 +0100442 }
Alan Ottb4dbde92011-01-18 03:04:39 -0500443 }
Jiri Kosina9188e792008-11-12 16:14:08 +0100444
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300445 ret = -ENOTTY;
Jiri Kosina86166b72007-05-14 09:57:40 +0200446 }
Antonio Ospited20d5ff2010-10-05 17:20:16 +0200447out:
Jiri Kosina2e574802010-03-25 14:15:11 +0100448 mutex_unlock(&minors_lock);
Alan Cox979c4072008-05-26 11:25:26 +0200449 return ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200450}
451
452static const struct file_operations hidraw_ops = {
453 .owner = THIS_MODULE,
454 .read = hidraw_read,
455 .write = hidraw_write,
456 .poll = hidraw_poll,
457 .open = hidraw_open,
458 .release = hidraw_release,
Alan Cox979c4072008-05-26 11:25:26 +0200459 .unlocked_ioctl = hidraw_ioctl,
Andrew Dugganb5531312012-11-27 19:02:27 -0800460 .fasync = hidraw_fasync,
Alan Ottae5e49c2011-01-04 00:37:22 -0500461#ifdef CONFIG_COMPAT
462 .compat_ioctl = hidraw_ioctl,
463#endif
Arnd Bergmann6038f372010-08-15 18:52:59 +0200464 .llseek = noop_llseek,
Jiri Kosina86166b72007-05-14 09:57:40 +0200465};
466
Jiri Kosinab6787242012-04-27 00:56:08 +0200467int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
Jiri Kosina86166b72007-05-14 09:57:40 +0200468{
469 struct hidraw *dev = hid->hidraw;
470 struct hidraw_list *list;
Jiri Kosinab6787242012-04-27 00:56:08 +0200471 int ret = 0;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800472 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200473
Yonghua Zheng277fe442013-08-26 23:38:35 +0800474 spin_lock_irqsave(&dev->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200475 list_for_each_entry(list, &dev->list, node) {
Matthieu CASTET4c7b4172012-06-28 16:51:56 +0200476 int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
477
478 if (new_head == list->tail)
479 continue;
480
Jiri Kosinab6787242012-04-27 00:56:08 +0200481 if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
482 ret = -ENOMEM;
483 break;
484 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200485 list->buffer[list->head].len = len;
Matthieu CASTET4c7b4172012-06-28 16:51:56 +0200486 list->head = new_head;
Jiri Kosina86166b72007-05-14 09:57:40 +0200487 kill_fasync(&list->fasync, SIGIO, POLL_IN);
488 }
Yonghua Zheng277fe442013-08-26 23:38:35 +0800489 spin_unlock_irqrestore(&dev->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200490
491 wake_up_interruptible(&dev->wait);
Jiri Kosinab6787242012-04-27 00:56:08 +0200492 return ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200493}
494EXPORT_SYMBOL_GPL(hidraw_report_event);
495
496int hidraw_connect(struct hid_device *hid)
497{
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200498 int minor, result;
Jiri Kosina86166b72007-05-14 09:57:40 +0200499 struct hidraw *dev;
500
Jiri Kosinabbe281f2009-06-04 15:44:25 +0200501 /* we accept any HID device, no matter the applications */
Jiri Kosina86166b72007-05-14 09:57:40 +0200502
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200503 dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
504 if (!dev)
505 return -ENOMEM;
506
507 result = -EINVAL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200508
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100509 mutex_lock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200510
511 for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
512 if (hidraw_table[minor])
513 continue;
514 hidraw_table[minor] = dev;
515 result = 0;
516 break;
517 }
518
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200519 if (result) {
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100520 mutex_unlock(&minors_lock);
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200521 kfree(dev);
Jiri Kosina86166b72007-05-14 09:57:40 +0200522 goto out;
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200523 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200524
Jiri Kosinaaae6c282008-12-04 16:16:46 +0100525 dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
Greg Kroah-Hartmana9b12612008-07-21 20:03:34 -0700526 NULL, "%s%d", "hidraw", minor);
Jiri Kosina86166b72007-05-14 09:57:40 +0200527
528 if (IS_ERR(dev->dev)) {
Jiri Kosina86166b72007-05-14 09:57:40 +0200529 hidraw_table[minor] = NULL;
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100530 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200531 result = PTR_ERR(dev->dev);
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200532 kfree(dev);
Jiri Kosina86166b72007-05-14 09:57:40 +0200533 goto out;
534 }
535
536 init_waitqueue_head(&dev->wait);
Yonghua Zheng277fe442013-08-26 23:38:35 +0800537 spin_lock_init(&dev->list_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200538 INIT_LIST_HEAD(&dev->list);
539
540 dev->hid = hid;
541 dev->minor = minor;
542
543 dev->exist = 1;
544 hid->hidraw = dev;
545
Yonghua Zheng8e552e52013-07-30 14:16:10 +0800546 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200547out:
548 return result;
549
550}
551EXPORT_SYMBOL_GPL(hidraw_connect);
552
553void hidraw_disconnect(struct hid_device *hid)
554{
555 struct hidraw *hidraw = hid->hidraw;
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100556
557 mutex_lock(&minors_lock);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100558
Manoj Chourasia212a8712013-07-22 15:33:13 +0530559 drop_ref(hidraw, 1);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100560
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100561 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200562}
563EXPORT_SYMBOL_GPL(hidraw_disconnect);
564
565int __init hidraw_init(void)
566{
567 int result;
568 dev_t dev_id;
569
570 result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
571 HIDRAW_MAX_DEVICES, "hidraw");
572
573 hidraw_major = MAJOR(dev_id);
574
575 if (result < 0) {
Joe Perches4291ee32010-12-09 19:29:03 -0800576 pr_warn("can't get major number\n");
Jiri Kosina86166b72007-05-14 09:57:40 +0200577 goto out;
578 }
579
580 hidraw_class = class_create(THIS_MODULE, "hidraw");
581 if (IS_ERR(hidraw_class)) {
582 result = PTR_ERR(hidraw_class);
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400583 goto error_cdev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200584 }
585
586 cdev_init(&hidraw_cdev, &hidraw_ops);
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400587 result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
588 if (result < 0)
589 goto error_class;
590
Jiri Kosina0f690cc2013-02-19 14:05:34 +0100591 printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n");
Jiri Kosina86166b72007-05-14 09:57:40 +0200592out:
593 return result;
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400594
595error_class:
596 class_destroy(hidraw_class);
597error_cdev:
598 unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
599 goto out;
Jiri Kosina86166b72007-05-14 09:57:40 +0200600}
601
Jiri Slaby140ae3e2008-10-17 18:04:48 +0200602void hidraw_exit(void)
Jiri Kosina86166b72007-05-14 09:57:40 +0200603{
604 dev_t dev_id = MKDEV(hidraw_major, 0);
605
606 cdev_del(&hidraw_cdev);
607 class_destroy(hidraw_class);
608 unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
609
610}