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1/*
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
22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#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>
33#include <linux/slab.h>
34#include <linux/hid.h>
35#include <linux/mutex.h>
36#include <linux/sched.h>
37
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];
44static DEFINE_MUTEX(minors_lock);
45
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;
50 DECLARE_WAITQUEUE(wait, current);
51
52 mutex_lock(&list->read_mutex);
53
54 while (ret == 0) {
55 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
87 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 }
94 ret = len;
95
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
104/* The first byte is expected to be a report number.
105 * This function is to be called with the minors_lock mutex held */
106static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type)
107{
108 unsigned int minor = iminor(file->f_path.dentry->d_inode);
109 struct hid_device *dev;
110 __u8 *buf;
111 int ret = 0;
112
113 if (!hidraw_table[minor]) {
114 ret = -ENODEV;
115 goto out;
116 }
117
118 dev = hidraw_table[minor]->hid;
119
120 if (!dev->hid_output_raw_report) {
121 ret = -ENODEV;
122 goto out;
123 }
124
125 if (count > HID_MAX_BUFFER_SIZE) {
126 hid_warn(dev, "pid %d passed too large report\n",
127 task_pid_nr(current));
128 ret = -EINVAL;
129 goto out;
130 }
131
132 if (count < 2) {
133 hid_warn(dev, "pid %d passed too short report\n",
134 task_pid_nr(current));
135 ret = -EINVAL;
136 goto out;
137 }
138
139 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
150 ret = dev->hid_output_raw_report(dev, buf, count, report_type);
151out_free:
152 kfree(buf);
153out:
154 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);
163 mutex_unlock(&minors_lock);
164 return ret;
165}
166
167
168/* This function performs a Get_Report transfer over the control endpoint
169 * 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. */
174static 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,
210 * which is passed to dev->hid_get_raw_report(). */
211 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
236static 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
260 mutex_lock(&minors_lock);
261 if (!hidraw_table[minor]) {
262 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];
273 if (!dev->open++) {
274 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);
279 if (err < 0) {
280 hid_hw_power(dev->hid, PM_HINT_NORMAL);
281 dev->open--;
282 }
283 }
284
285out_unlock:
286 mutex_unlock(&minors_lock);
287out:
288 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;
297 int ret;
298
299 mutex_lock(&minors_lock);
300 if (!hidraw_table[minor]) {
301 ret = -ENODEV;
302 goto unlock;
303 }
304
305 list_del(&list->node);
306 dev = hidraw_table[minor];
307 if (!--dev->open) {
308 if (list->hidraw->exist) {
309 hid_hw_power(dev->hid, PM_HINT_NORMAL);
310 hid_hw_close(dev->hid);
311 } else {
312 kfree(list->hidraw);
313 }
314 }
315 kfree(list);
316 ret = 0;
317unlock:
318 mutex_unlock(&minors_lock);
319
320 return ret;
321}
322
323static long hidraw_ioctl(struct file *file, unsigned int cmd,
324 unsigned long arg)
325{
326 struct inode *inode = file->f_path.dentry->d_inode;
327 unsigned int minor = iminor(inode);
328 long ret = 0;
329 struct hidraw *dev;
330 void __user *user_arg = (void __user*) arg;
331
332 mutex_lock(&minors_lock);
333 dev = hidraw_table[minor];
334 if (!dev) {
335 ret = -ENODEV;
336 goto out;
337 }
338
339 switch (cmd) {
340 case HIDIOCGRDESCSIZE:
341 if (put_user(dev->hid->rsize, (int __user *)arg))
342 ret = -EFAULT;
343 break;
344
345 case HIDIOCGRDESC:
346 {
347 __u32 len;
348
349 if (get_user(len, (int __user *)arg))
350 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;
360 }
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)))
369 ret = -EFAULT;
370 break;
371 }
372 default:
373 {
374 struct hid_device *hid = dev->hid;
375 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) {
393 ret = -EINVAL;
394 break;
395 }
396
397 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
398 int len = strlen(hid->name) + 1;
399 if (len > _IOC_SIZE(cmd))
400 len = _IOC_SIZE(cmd);
401 ret = copy_to_user(user_arg, hid->name, len) ?
402 -EFAULT : len;
403 break;
404 }
405
406 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
407 int len = strlen(hid->phys) + 1;
408 if (len > _IOC_SIZE(cmd))
409 len = _IOC_SIZE(cmd);
410 ret = copy_to_user(user_arg, hid->phys, len) ?
411 -EFAULT : len;
412 break;
413 }
414 }
415
416 ret = -ENOTTY;
417 }
418out:
419 mutex_unlock(&minors_lock);
420 return ret;
421}
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,
430 .unlocked_ioctl = hidraw_ioctl,
431#ifdef CONFIG_COMPAT
432 .compat_ioctl = hidraw_ioctl,
433#endif
434 .llseek = noop_llseek,
435};
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{
455 int minor, result;
456 struct hidraw *dev;
457
458 /* we accept any HID device, no matter the applications */
459
460 dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
461 if (!dev)
462 return -ENOMEM;
463
464 result = -EINVAL;
465
466 mutex_lock(&minors_lock);
467
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
476 if (result) {
477 mutex_unlock(&minors_lock);
478 kfree(dev);
479 goto out;
480 }
481
482 dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
483 NULL, "%s%d", "hidraw", minor);
484
485 if (IS_ERR(dev->dev)) {
486 hidraw_table[minor] = NULL;
487 mutex_unlock(&minors_lock);
488 result = PTR_ERR(dev->dev);
489 kfree(dev);
490 goto out;
491 }
492
493 mutex_unlock(&minors_lock);
494 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
515 device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
516
517 mutex_lock(&minors_lock);
518 hidraw_table[hidraw->minor] = NULL;
519 mutex_unlock(&minors_lock);
520
521 if (hidraw->open) {
522 hid_hw_close(hid);
523 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) {
541 pr_warn("can't get major number\n");
542 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
559void hidraw_exit(void)
560{
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}
1/*
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
22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#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>
33#include <linux/slab.h>
34#include <linux/hid.h>
35#include <linux/mutex.h>
36#include <linux/sched.h>
37
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];
44static DEFINE_MUTEX(minors_lock);
45
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;
50 DECLARE_WAITQUEUE(wait, current);
51
52 mutex_lock(&list->read_mutex);
53
54 while (ret == 0) {
55 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
87 len = list->buffer[list->tail].len > count ?
88 count : list->buffer[list->tail].len;
89
90 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;
96 }
97
98 kfree(list->buffer[list->tail].value);
99 list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
100 }
101out:
102 mutex_unlock(&list->read_mutex);
103 return ret;
104}
105
106/* The first byte is expected to be a report number.
107 * This function is to be called with the minors_lock mutex held */
108static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type)
109{
110 unsigned int minor = iminor(file->f_path.dentry->d_inode);
111 struct hid_device *dev;
112 __u8 *buf;
113 int ret = 0;
114
115 if (!hidraw_table[minor]) {
116 ret = -ENODEV;
117 goto out;
118 }
119
120 dev = hidraw_table[minor]->hid;
121
122 if (!dev->hid_output_raw_report) {
123 ret = -ENODEV;
124 goto out;
125 }
126
127 if (count > HID_MAX_BUFFER_SIZE) {
128 hid_warn(dev, "pid %d passed too large report\n",
129 task_pid_nr(current));
130 ret = -EINVAL;
131 goto out;
132 }
133
134 if (count < 2) {
135 hid_warn(dev, "pid %d passed too short report\n",
136 task_pid_nr(current));
137 ret = -EINVAL;
138 goto out;
139 }
140
141 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
142 if (!buf) {
143 ret = -ENOMEM;
144 goto out;
145 }
146
147 if (copy_from_user(buf, buffer, count)) {
148 ret = -EFAULT;
149 goto out_free;
150 }
151
152 ret = dev->hid_output_raw_report(dev, buf, count, report_type);
153out_free:
154 kfree(buf);
155out:
156 return ret;
157}
158
159/* the first byte is expected to be a report number */
160static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
161{
162 ssize_t ret;
163 mutex_lock(&minors_lock);
164 ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT);
165 mutex_unlock(&minors_lock);
166 return ret;
167}
168
169
170/* This function performs a Get_Report transfer over the control endpoint
171 * per section 7.2.1 of the HID specification, version 1.1. The first byte
172 * of buffer is the report number to request, or 0x0 if the defice does not
173 * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
174 * or HID_INPUT_REPORT. This function is to be called with the minors_lock
175 * mutex held. */
176static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
177{
178 unsigned int minor = iminor(file->f_path.dentry->d_inode);
179 struct hid_device *dev;
180 __u8 *buf;
181 int ret = 0, len;
182 unsigned char report_number;
183
184 dev = hidraw_table[minor]->hid;
185
186 if (!dev->hid_get_raw_report) {
187 ret = -ENODEV;
188 goto out;
189 }
190
191 if (count > HID_MAX_BUFFER_SIZE) {
192 printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
193 task_pid_nr(current));
194 ret = -EINVAL;
195 goto out;
196 }
197
198 if (count < 2) {
199 printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
200 task_pid_nr(current));
201 ret = -EINVAL;
202 goto out;
203 }
204
205 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
206 if (!buf) {
207 ret = -ENOMEM;
208 goto out;
209 }
210
211 /* Read the first byte from the user. This is the report number,
212 * which is passed to dev->hid_get_raw_report(). */
213 if (copy_from_user(&report_number, buffer, 1)) {
214 ret = -EFAULT;
215 goto out_free;
216 }
217
218 ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type);
219
220 if (ret < 0)
221 goto out_free;
222
223 len = (ret < count) ? ret : count;
224
225 if (copy_to_user(buffer, buf, len)) {
226 ret = -EFAULT;
227 goto out_free;
228 }
229
230 ret = len;
231
232out_free:
233 kfree(buf);
234out:
235 return ret;
236}
237
238static unsigned int hidraw_poll(struct file *file, poll_table *wait)
239{
240 struct hidraw_list *list = file->private_data;
241
242 poll_wait(file, &list->hidraw->wait, wait);
243 if (list->head != list->tail)
244 return POLLIN | POLLRDNORM;
245 if (!list->hidraw->exist)
246 return POLLERR | POLLHUP;
247 return 0;
248}
249
250static int hidraw_open(struct inode *inode, struct file *file)
251{
252 unsigned int minor = iminor(inode);
253 struct hidraw *dev;
254 struct hidraw_list *list;
255 int err = 0;
256
257 if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
258 err = -ENOMEM;
259 goto out;
260 }
261
262 mutex_lock(&minors_lock);
263 if (!hidraw_table[minor]) {
264 err = -ENODEV;
265 goto out_unlock;
266 }
267
268 list->hidraw = hidraw_table[minor];
269 mutex_init(&list->read_mutex);
270 list_add_tail(&list->node, &hidraw_table[minor]->list);
271 file->private_data = list;
272
273 dev = hidraw_table[minor];
274 if (!dev->open++) {
275 err = hid_hw_power(dev->hid, PM_HINT_FULLON);
276 if (err < 0) {
277 dev->open--;
278 goto out_unlock;
279 }
280
281 err = hid_hw_open(dev->hid);
282 if (err < 0) {
283 hid_hw_power(dev->hid, PM_HINT_NORMAL);
284 dev->open--;
285 }
286 }
287
288out_unlock:
289 mutex_unlock(&minors_lock);
290out:
291 if (err < 0)
292 kfree(list);
293 return err;
294
295}
296
297static int hidraw_release(struct inode * inode, struct file * file)
298{
299 unsigned int minor = iminor(inode);
300 struct hidraw *dev;
301 struct hidraw_list *list = file->private_data;
302 int ret;
303
304 mutex_lock(&minors_lock);
305 if (!hidraw_table[minor]) {
306 ret = -ENODEV;
307 goto unlock;
308 }
309
310 list_del(&list->node);
311 dev = hidraw_table[minor];
312 if (!--dev->open) {
313 if (list->hidraw->exist) {
314 hid_hw_power(dev->hid, PM_HINT_NORMAL);
315 hid_hw_close(dev->hid);
316 } else {
317 kfree(list->hidraw);
318 }
319 }
320 kfree(list);
321 ret = 0;
322unlock:
323 mutex_unlock(&minors_lock);
324
325 return ret;
326}
327
328static long hidraw_ioctl(struct file *file, unsigned int cmd,
329 unsigned long arg)
330{
331 struct inode *inode = file->f_path.dentry->d_inode;
332 unsigned int minor = iminor(inode);
333 long ret = 0;
334 struct hidraw *dev;
335 void __user *user_arg = (void __user*) arg;
336
337 mutex_lock(&minors_lock);
338 dev = hidraw_table[minor];
339 if (!dev) {
340 ret = -ENODEV;
341 goto out;
342 }
343
344 switch (cmd) {
345 case HIDIOCGRDESCSIZE:
346 if (put_user(dev->hid->rsize, (int __user *)arg))
347 ret = -EFAULT;
348 break;
349
350 case HIDIOCGRDESC:
351 {
352 __u32 len;
353
354 if (get_user(len, (int __user *)arg))
355 ret = -EFAULT;
356 else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
357 ret = -EINVAL;
358 else if (copy_to_user(user_arg + offsetof(
359 struct hidraw_report_descriptor,
360 value[0]),
361 dev->hid->rdesc,
362 min(dev->hid->rsize, len)))
363 ret = -EFAULT;
364 break;
365 }
366 case HIDIOCGRAWINFO:
367 {
368 struct hidraw_devinfo dinfo;
369
370 dinfo.bustype = dev->hid->bus;
371 dinfo.vendor = dev->hid->vendor;
372 dinfo.product = dev->hid->product;
373 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
374 ret = -EFAULT;
375 break;
376 }
377 default:
378 {
379 struct hid_device *hid = dev->hid;
380 if (_IOC_TYPE(cmd) != 'H') {
381 ret = -EINVAL;
382 break;
383 }
384
385 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) {
386 int len = _IOC_SIZE(cmd);
387 ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT);
388 break;
389 }
390 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) {
391 int len = _IOC_SIZE(cmd);
392 ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT);
393 break;
394 }
395
396 /* Begin Read-only ioctls. */
397 if (_IOC_DIR(cmd) != _IOC_READ) {
398 ret = -EINVAL;
399 break;
400 }
401
402 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
403 int len = strlen(hid->name) + 1;
404 if (len > _IOC_SIZE(cmd))
405 len = _IOC_SIZE(cmd);
406 ret = copy_to_user(user_arg, hid->name, len) ?
407 -EFAULT : len;
408 break;
409 }
410
411 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
412 int len = strlen(hid->phys) + 1;
413 if (len > _IOC_SIZE(cmd))
414 len = _IOC_SIZE(cmd);
415 ret = copy_to_user(user_arg, hid->phys, len) ?
416 -EFAULT : len;
417 break;
418 }
419 }
420
421 ret = -ENOTTY;
422 }
423out:
424 mutex_unlock(&minors_lock);
425 return ret;
426}
427
428static const struct file_operations hidraw_ops = {
429 .owner = THIS_MODULE,
430 .read = hidraw_read,
431 .write = hidraw_write,
432 .poll = hidraw_poll,
433 .open = hidraw_open,
434 .release = hidraw_release,
435 .unlocked_ioctl = hidraw_ioctl,
436#ifdef CONFIG_COMPAT
437 .compat_ioctl = hidraw_ioctl,
438#endif
439 .llseek = noop_llseek,
440};
441
442int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
443{
444 struct hidraw *dev = hid->hidraw;
445 struct hidraw_list *list;
446 int ret = 0;
447
448 list_for_each_entry(list, &dev->list, node) {
449 if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
450 ret = -ENOMEM;
451 break;
452 }
453 list->buffer[list->head].len = len;
454 list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
455 kill_fasync(&list->fasync, SIGIO, POLL_IN);
456 }
457
458 wake_up_interruptible(&dev->wait);
459 return ret;
460}
461EXPORT_SYMBOL_GPL(hidraw_report_event);
462
463int hidraw_connect(struct hid_device *hid)
464{
465 int minor, result;
466 struct hidraw *dev;
467
468 /* we accept any HID device, no matter the applications */
469
470 dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
471 if (!dev)
472 return -ENOMEM;
473
474 result = -EINVAL;
475
476 mutex_lock(&minors_lock);
477
478 for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
479 if (hidraw_table[minor])
480 continue;
481 hidraw_table[minor] = dev;
482 result = 0;
483 break;
484 }
485
486 if (result) {
487 mutex_unlock(&minors_lock);
488 kfree(dev);
489 goto out;
490 }
491
492 dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
493 NULL, "%s%d", "hidraw", minor);
494
495 if (IS_ERR(dev->dev)) {
496 hidraw_table[minor] = NULL;
497 mutex_unlock(&minors_lock);
498 result = PTR_ERR(dev->dev);
499 kfree(dev);
500 goto out;
501 }
502
503 mutex_unlock(&minors_lock);
504 init_waitqueue_head(&dev->wait);
505 INIT_LIST_HEAD(&dev->list);
506
507 dev->hid = hid;
508 dev->minor = minor;
509
510 dev->exist = 1;
511 hid->hidraw = dev;
512
513out:
514 return result;
515
516}
517EXPORT_SYMBOL_GPL(hidraw_connect);
518
519void hidraw_disconnect(struct hid_device *hid)
520{
521 struct hidraw *hidraw = hid->hidraw;
522
523 mutex_lock(&minors_lock);
524 hidraw->exist = 0;
525
526 device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
527
528 hidraw_table[hidraw->minor] = NULL;
529
530 if (hidraw->open) {
531 hid_hw_close(hid);
532 wake_up_interruptible(&hidraw->wait);
533 } else {
534 kfree(hidraw);
535 }
536 mutex_unlock(&minors_lock);
537}
538EXPORT_SYMBOL_GPL(hidraw_disconnect);
539
540int __init hidraw_init(void)
541{
542 int result;
543 dev_t dev_id;
544
545 result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
546 HIDRAW_MAX_DEVICES, "hidraw");
547
548 hidraw_major = MAJOR(dev_id);
549
550 if (result < 0) {
551 pr_warn("can't get major number\n");
552 result = 0;
553 goto out;
554 }
555
556 hidraw_class = class_create(THIS_MODULE, "hidraw");
557 if (IS_ERR(hidraw_class)) {
558 result = PTR_ERR(hidraw_class);
559 unregister_chrdev(hidraw_major, "hidraw");
560 goto out;
561 }
562
563 cdev_init(&hidraw_cdev, &hidraw_ops);
564 cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
565out:
566 return result;
567}
568
569void hidraw_exit(void)
570{
571 dev_t dev_id = MKDEV(hidraw_major, 0);
572
573 cdev_del(&hidraw_cdev);
574 class_destroy(hidraw_class);
575 unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
576
577}