blob: f0e2757cb9094dee3bab158d2c368c739ec91c20 [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>
Dmitry Torokhov8f507c82016-03-16 16:59:38 -070037#include <linux/string.h>
Jiri Kosina86166b72007-05-14 09:57:40 +020038
39#include <linux/hidraw.h>
40
41static int hidraw_major;
42static struct cdev hidraw_cdev;
43static struct class *hidraw_class;
44static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES];
Oliver Neukum7d672cd2008-10-31 00:07:23 +010045static DEFINE_MUTEX(minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +020046
47static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
48{
49 struct hidraw_list *list = file->private_data;
50 int ret = 0, len;
Jiri Kosina86166b72007-05-14 09:57:40 +020051 DECLARE_WAITQUEUE(wait, current);
52
Jiri Kosinab0e14952009-10-12 11:25:56 +020053 mutex_lock(&list->read_mutex);
54
Jiri Kosina86166b72007-05-14 09:57:40 +020055 while (ret == 0) {
Jiri Kosina86166b72007-05-14 09:57:40 +020056 if (list->head == list->tail) {
57 add_wait_queue(&list->hidraw->wait, &wait);
58 set_current_state(TASK_INTERRUPTIBLE);
59
60 while (list->head == list->tail) {
Jiri Kosina86166b72007-05-14 09:57:40 +020061 if (signal_pending(current)) {
62 ret = -ERESTARTSYS;
63 break;
64 }
65 if (!list->hidraw->exist) {
66 ret = -EIO;
67 break;
68 }
Founder Fang7611e8d2012-11-21 15:20:31 +080069 if (file->f_flags & O_NONBLOCK) {
70 ret = -EAGAIN;
71 break;
72 }
Jiri Kosina86166b72007-05-14 09:57:40 +020073
74 /* allow O_NONBLOCK to work well from other threads */
75 mutex_unlock(&list->read_mutex);
76 schedule();
77 mutex_lock(&list->read_mutex);
78 set_current_state(TASK_INTERRUPTIBLE);
79 }
80
81 set_current_state(TASK_RUNNING);
82 remove_wait_queue(&list->hidraw->wait, &wait);
83 }
84
85 if (ret)
86 goto out;
87
Jiri Kosina86166b72007-05-14 09:57:40 +020088 len = list->buffer[list->tail].len > count ?
89 count : list->buffer[list->tail].len;
90
Jiri Kosinab6787242012-04-27 00:56:08 +020091 if (list->buffer[list->tail].value) {
92 if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
93 ret = -EFAULT;
94 goto out;
95 }
96 ret = len;
Jiri Kosina86166b72007-05-14 09:57:40 +020097 }
Jiri Kosina86166b72007-05-14 09:57:40 +020098
99 kfree(list->buffer[list->tail].value);
Matthieu CASTET4c7b4172012-06-28 16:51:56 +0200100 list->buffer[list->tail].value = NULL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200101 list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
102 }
103out:
104 mutex_unlock(&list->read_mutex);
105 return ret;
106}
107
Jiri Kosina61834532014-01-06 16:43:27 +0100108/*
109 * The first byte of the report buffer is expected to be a report number.
110 *
111 * This function is to be called with the minors_lock mutex held.
112 */
Alan Ottb4dbde92011-01-18 03:04:39 -0500113static 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 +0200114{
Al Viro496ad9a2013-01-23 17:07:38 -0500115 unsigned int minor = iminor(file_inode(file));
Jiri Kosina2e574802010-03-25 14:15:11 +0100116 struct hid_device *dev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200117 __u8 *buf;
118 int ret = 0;
119
Manoj Chourasia212a8712013-07-22 15:33:13 +0530120 if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
Antonio Ospitee42dee92010-10-05 17:20:17 +0200121 ret = -ENODEV;
122 goto out;
123 }
124
Jiri Kosina2e574802010-03-25 14:15:11 +0100125 dev = hidraw_table[minor]->hid;
126
Jiri Kosina2b107d62008-09-17 19:41:58 +0200127 if (count > HID_MAX_BUFFER_SIZE) {
Joe Perches4291ee32010-12-09 19:29:03 -0800128 hid_warn(dev, "pid %d passed too large report\n",
129 task_pid_nr(current));
Jiri Kosina2e574802010-03-25 14:15:11 +0100130 ret = -EINVAL;
131 goto out;
Jiri Kosina86166b72007-05-14 09:57:40 +0200132 }
133
134 if (count < 2) {
Joe Perches4291ee32010-12-09 19:29:03 -0800135 hid_warn(dev, "pid %d passed too short report\n",
136 task_pid_nr(current));
Jiri Kosina2e574802010-03-25 14:15:11 +0100137 ret = -EINVAL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200138 goto out;
139 }
140
Dmitry Torokhov8f507c82016-03-16 16:59:38 -0700141 buf = memdup_user(buffer, count);
142 if (IS_ERR(buf)) {
143 ret = PTR_ERR(buf);
Jiri Kosina2e574802010-03-25 14:15:11 +0100144 goto out;
145 }
146
Benjamin Tissoirese534a932014-03-08 22:52:42 -0500147 if ((report_type == HID_OUTPUT_REPORT) &&
148 !(dev->quirks & HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP)) {
Benjamin Tissoires3a75b242014-02-20 15:24:50 -0500149 ret = hid_hw_output_report(dev, buf, count);
150 /*
151 * compatibility with old implementation of USB-HID and I2C-HID:
152 * if the device does not support receiving output reports,
153 * on an interrupt endpoint, fallback to SET_REPORT HID command.
154 */
155 if (ret != -ENOSYS)
156 goto out_free;
157 }
158
159 ret = hid_hw_raw_request(dev, buf[0], buf, count, report_type,
160 HID_REQ_SET_REPORT);
161
Jiri Kosina2e574802010-03-25 14:15:11 +0100162out_free:
Jiri Kosina86166b72007-05-14 09:57:40 +0200163 kfree(buf);
Jiri Kosina2e574802010-03-25 14:15:11 +0100164out:
Alan Ottb4dbde92011-01-18 03:04:39 -0500165 return ret;
166}
167
Alan Ottb4dbde92011-01-18 03:04:39 -0500168static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
169{
170 ssize_t ret;
171 mutex_lock(&minors_lock);
172 ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT);
Jiri Kosina2e574802010-03-25 14:15:11 +0100173 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200174 return ret;
175}
176
Alan Ottb4dbde92011-01-18 03:04:39 -0500177
Jiri Kosina61834532014-01-06 16:43:27 +0100178/*
179 * This function performs a Get_Report transfer over the control endpoint
Jiri Kosinad2a1cfe2011-03-27 20:29:02 +0200180 * per section 7.2.1 of the HID specification, version 1.1. The first byte
181 * of buffer is the report number to request, or 0x0 if the defice does not
182 * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
Jiri Kosina61834532014-01-06 16:43:27 +0100183 * or HID_INPUT_REPORT.
184 *
185 * This function is to be called with the minors_lock mutex held.
186 */
Alan Ottb4dbde92011-01-18 03:04:39 -0500187static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
188{
Al Viro496ad9a2013-01-23 17:07:38 -0500189 unsigned int minor = iminor(file_inode(file));
Alan Ottb4dbde92011-01-18 03:04:39 -0500190 struct hid_device *dev;
191 __u8 *buf;
192 int ret = 0, len;
193 unsigned char report_number;
194
195 dev = hidraw_table[minor]->hid;
196
Benjamin Tissoirescafebc02014-02-05 16:33:22 -0500197 if (!dev->ll_driver->raw_request) {
Alan Ottb4dbde92011-01-18 03:04:39 -0500198 ret = -ENODEV;
199 goto out;
200 }
201
202 if (count > HID_MAX_BUFFER_SIZE) {
203 printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
204 task_pid_nr(current));
205 ret = -EINVAL;
206 goto out;
207 }
208
209 if (count < 2) {
210 printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
211 task_pid_nr(current));
212 ret = -EINVAL;
213 goto out;
214 }
215
216 buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
217 if (!buf) {
218 ret = -ENOMEM;
219 goto out;
220 }
221
Jiri Kosina61834532014-01-06 16:43:27 +0100222 /*
223 * Read the first byte from the user. This is the report number,
Benjamin Tissoirescafebc02014-02-05 16:33:22 -0500224 * which is passed to hid_hw_raw_request().
Jiri Kosina61834532014-01-06 16:43:27 +0100225 */
Alan Ottb4dbde92011-01-18 03:04:39 -0500226 if (copy_from_user(&report_number, buffer, 1)) {
227 ret = -EFAULT;
228 goto out_free;
229 }
230
Benjamin Tissoirescafebc02014-02-05 16:33:22 -0500231 ret = hid_hw_raw_request(dev, report_number, buf, count, report_type,
232 HID_REQ_GET_REPORT);
Alan Ottb4dbde92011-01-18 03:04:39 -0500233
234 if (ret < 0)
235 goto out_free;
236
237 len = (ret < count) ? ret : count;
238
239 if (copy_to_user(buffer, buf, len)) {
240 ret = -EFAULT;
241 goto out_free;
242 }
243
244 ret = len;
245
246out_free:
247 kfree(buf);
248out:
249 return ret;
250}
251
Jiri Kosina86166b72007-05-14 09:57:40 +0200252static unsigned int hidraw_poll(struct file *file, poll_table *wait)
253{
254 struct hidraw_list *list = file->private_data;
255
256 poll_wait(file, &list->hidraw->wait, wait);
257 if (list->head != list->tail)
258 return POLLIN | POLLRDNORM;
259 if (!list->hidraw->exist)
260 return POLLERR | POLLHUP;
261 return 0;
262}
263
264static int hidraw_open(struct inode *inode, struct file *file)
265{
266 unsigned int minor = iminor(inode);
267 struct hidraw *dev;
268 struct hidraw_list *list;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800269 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200270 int err = 0;
271
272 if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
273 err = -ENOMEM;
274 goto out;
275 }
276
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100277 mutex_lock(&minors_lock);
Manoj Chourasia212a8712013-07-22 15:33:13 +0530278 if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
Jiri Kosina86166b72007-05-14 09:57:40 +0200279 err = -ENODEV;
280 goto out_unlock;
281 }
282
Jiri Kosina86166b72007-05-14 09:57:40 +0200283 dev = hidraw_table[minor];
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100284 if (!dev->open++) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800285 err = hid_hw_power(dev->hid, PM_HINT_FULLON);
Amit Nagalf554ff82011-09-27 13:41:58 -0400286 if (err < 0) {
287 dev->open--;
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800288 goto out_unlock;
Amit Nagalf554ff82011-09-27 13:41:58 -0400289 }
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800290
291 err = hid_hw_open(dev->hid);
Oliver Neukum0361a282008-12-17 15:38:03 +0100292 if (err < 0) {
Dmitry Torokhov5bea7662010-12-07 23:02:48 -0800293 hid_hw_power(dev->hid, PM_HINT_NORMAL);
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100294 dev->open--;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800295 goto out_unlock;
Oliver Neukum0361a282008-12-17 15:38:03 +0100296 }
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100297 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200298
Yonghua Zheng277fe442013-08-26 23:38:35 +0800299 list->hidraw = hidraw_table[minor];
300 mutex_init(&list->read_mutex);
301 spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
302 list_add_tail(&list->node, &hidraw_table[minor]->list);
303 spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
304 file->private_data = list;
Jiri Kosina86166b72007-05-14 09:57:40 +0200305out_unlock:
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100306 mutex_unlock(&minors_lock);
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100307out:
Amit Nagal1a896232011-09-07 13:48:47 +0200308 if (err < 0)
309 kfree(list);
Jiri Kosina86166b72007-05-14 09:57:40 +0200310 return err;
311
312}
313
Andrew Dugganb5531312012-11-27 19:02:27 -0800314static int hidraw_fasync(int fd, struct file *file, int on)
315{
316 struct hidraw_list *list = file->private_data;
317
318 return fasync_helper(fd, file, on, &list->fasync);
319}
320
Manoj Chourasia212a8712013-07-22 15:33:13 +0530321static void drop_ref(struct hidraw *hidraw, int exists_bit)
322{
323 if (exists_bit) {
Manoj Chourasia212a8712013-07-22 15:33:13 +0530324 hidraw->exist = 0;
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530325 if (hidraw->open) {
326 hid_hw_close(hidraw->hid);
Manoj Chourasia212a8712013-07-22 15:33:13 +0530327 wake_up_interruptible(&hidraw->wait);
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530328 }
Fernando Luis Vázquez Cao47587fc2014-02-26 16:51:24 +0900329 device_destroy(hidraw_class,
330 MKDEV(hidraw_major, hidraw->minor));
Manoj Chourasia212a8712013-07-22 15:33:13 +0530331 } else {
332 --hidraw->open;
333 }
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530334 if (!hidraw->open) {
335 if (!hidraw->exist) {
Manoj Chourasia0f5a24c2013-10-01 15:39:00 +0530336 hidraw_table[hidraw->minor] = NULL;
337 kfree(hidraw);
338 } else {
339 /* close device for last reader */
340 hid_hw_power(hidraw->hid, PM_HINT_NORMAL);
341 hid_hw_close(hidraw->hid);
342 }
Manoj Chourasia212a8712013-07-22 15:33:13 +0530343 }
344}
345
Jiri Kosina86166b72007-05-14 09:57:40 +0200346static int hidraw_release(struct inode * inode, struct file * file)
347{
348 unsigned int minor = iminor(inode);
Jiri Kosina86166b72007-05-14 09:57:40 +0200349 struct hidraw_list *list = file->private_data;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800350 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200351
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100352 mutex_lock(&minors_lock);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100353
Yonghua Zheng277fe442013-08-26 23:38:35 +0800354 spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200355 list_del(&list->node);
Yonghua Zheng277fe442013-08-26 23:38:35 +0800356 spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
Jiri Kosina4db1c622008-06-24 14:45:27 +0200357 kfree(list);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100358
Manoj Chourasia212a8712013-07-22 15:33:13 +0530359 drop_ref(hidraw_table[minor], 0);
360
361 mutex_unlock(&minors_lock);
362 return 0;
Jiri Kosina86166b72007-05-14 09:57:40 +0200363}
364
Alan Cox979c4072008-05-26 11:25:26 +0200365static long hidraw_ioctl(struct file *file, unsigned int cmd,
366 unsigned long arg)
Jiri Kosina86166b72007-05-14 09:57:40 +0200367{
Al Viro496ad9a2013-01-23 17:07:38 -0500368 struct inode *inode = file_inode(file);
Jiri Kosina86166b72007-05-14 09:57:40 +0200369 unsigned int minor = iminor(inode);
Alan Cox979c4072008-05-26 11:25:26 +0200370 long ret = 0;
Jiri Kosina2e574802010-03-25 14:15:11 +0100371 struct hidraw *dev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200372 void __user *user_arg = (void __user*) arg;
373
Jiri Kosina2e574802010-03-25 14:15:11 +0100374 mutex_lock(&minors_lock);
375 dev = hidraw_table[minor];
Antonio Ospited20d5ff2010-10-05 17:20:16 +0200376 if (!dev) {
377 ret = -ENODEV;
378 goto out;
379 }
Jiri Kosina2e574802010-03-25 14:15:11 +0100380
Jiri Kosina86166b72007-05-14 09:57:40 +0200381 switch (cmd) {
382 case HIDIOCGRDESCSIZE:
383 if (put_user(dev->hid->rsize, (int __user *)arg))
Alan Cox979c4072008-05-26 11:25:26 +0200384 ret = -EFAULT;
385 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200386
387 case HIDIOCGRDESC:
388 {
389 __u32 len;
390
391 if (get_user(len, (int __user *)arg))
Alan Cox979c4072008-05-26 11:25:26 +0200392 ret = -EFAULT;
393 else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
394 ret = -EINVAL;
395 else if (copy_to_user(user_arg + offsetof(
396 struct hidraw_report_descriptor,
397 value[0]),
398 dev->hid->rdesc,
399 min(dev->hid->rsize, len)))
400 ret = -EFAULT;
401 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200402 }
403 case HIDIOCGRAWINFO:
404 {
405 struct hidraw_devinfo dinfo;
406
407 dinfo.bustype = dev->hid->bus;
408 dinfo.vendor = dev->hid->vendor;
409 dinfo.product = dev->hid->product;
410 if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
Alan Cox979c4072008-05-26 11:25:26 +0200411 ret = -EFAULT;
412 break;
Jiri Kosina86166b72007-05-14 09:57:40 +0200413 }
414 default:
Jiri Kosina9188e792008-11-12 16:14:08 +0100415 {
416 struct hid_device *hid = dev->hid;
Alan Ottb4dbde92011-01-18 03:04:39 -0500417 if (_IOC_TYPE(cmd) != 'H') {
418 ret = -EINVAL;
419 break;
420 }
421
422 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) {
423 int len = _IOC_SIZE(cmd);
424 ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT);
425 break;
426 }
427 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) {
428 int len = _IOC_SIZE(cmd);
429 ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT);
430 break;
431 }
432
433 /* Begin Read-only ioctls. */
434 if (_IOC_DIR(cmd) != _IOC_READ) {
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300435 ret = -EINVAL;
436 break;
437 }
Jiri Kosina9188e792008-11-12 16:14:08 +0100438
439 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) {
Daniel Mackdd2ed482011-05-15 18:07:42 +0200440 int len = strlen(hid->name) + 1;
Jiri Kosina9188e792008-11-12 16:14:08 +0100441 if (len > _IOC_SIZE(cmd))
442 len = _IOC_SIZE(cmd);
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300443 ret = copy_to_user(user_arg, hid->name, len) ?
Jiri Kosina9188e792008-11-12 16:14:08 +0100444 -EFAULT : len;
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300445 break;
Jiri Kosina9188e792008-11-12 16:14:08 +0100446 }
447
448 if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) {
Daniel Mackdd2ed482011-05-15 18:07:42 +0200449 int len = strlen(hid->phys) + 1;
Jiri Kosina9188e792008-11-12 16:14:08 +0100450 if (len > _IOC_SIZE(cmd))
451 len = _IOC_SIZE(cmd);
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300452 ret = copy_to_user(user_arg, hid->phys, len) ?
Jiri Kosina9188e792008-11-12 16:14:08 +0100453 -EFAULT : len;
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300454 break;
Jiri Kosina9188e792008-11-12 16:14:08 +0100455 }
Alan Ottb4dbde92011-01-18 03:04:39 -0500456 }
Jiri Kosina9188e792008-11-12 16:14:08 +0100457
Dan Carpenterdfd395af2009-02-03 16:35:17 +0300458 ret = -ENOTTY;
Jiri Kosina86166b72007-05-14 09:57:40 +0200459 }
Antonio Ospited20d5ff2010-10-05 17:20:16 +0200460out:
Jiri Kosina2e574802010-03-25 14:15:11 +0100461 mutex_unlock(&minors_lock);
Alan Cox979c4072008-05-26 11:25:26 +0200462 return ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200463}
464
465static const struct file_operations hidraw_ops = {
466 .owner = THIS_MODULE,
467 .read = hidraw_read,
468 .write = hidraw_write,
469 .poll = hidraw_poll,
470 .open = hidraw_open,
471 .release = hidraw_release,
Alan Cox979c4072008-05-26 11:25:26 +0200472 .unlocked_ioctl = hidraw_ioctl,
Andrew Dugganb5531312012-11-27 19:02:27 -0800473 .fasync = hidraw_fasync,
Alan Ottae5e49c2011-01-04 00:37:22 -0500474#ifdef CONFIG_COMPAT
475 .compat_ioctl = hidraw_ioctl,
476#endif
Arnd Bergmann6038f372010-08-15 18:52:59 +0200477 .llseek = noop_llseek,
Jiri Kosina86166b72007-05-14 09:57:40 +0200478};
479
Jiri Kosinab6787242012-04-27 00:56:08 +0200480int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
Jiri Kosina86166b72007-05-14 09:57:40 +0200481{
482 struct hidraw *dev = hid->hidraw;
483 struct hidraw_list *list;
Jiri Kosinab6787242012-04-27 00:56:08 +0200484 int ret = 0;
Yonghua Zheng277fe442013-08-26 23:38:35 +0800485 unsigned long flags;
Jiri Kosina86166b72007-05-14 09:57:40 +0200486
Yonghua Zheng277fe442013-08-26 23:38:35 +0800487 spin_lock_irqsave(&dev->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200488 list_for_each_entry(list, &dev->list, node) {
Matthieu CASTET4c7b4172012-06-28 16:51:56 +0200489 int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
490
491 if (new_head == list->tail)
492 continue;
493
Jiri Kosinab6787242012-04-27 00:56:08 +0200494 if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
495 ret = -ENOMEM;
496 break;
497 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200498 list->buffer[list->head].len = len;
Matthieu CASTET4c7b4172012-06-28 16:51:56 +0200499 list->head = new_head;
Jiri Kosina86166b72007-05-14 09:57:40 +0200500 kill_fasync(&list->fasync, SIGIO, POLL_IN);
501 }
Yonghua Zheng277fe442013-08-26 23:38:35 +0800502 spin_unlock_irqrestore(&dev->list_lock, flags);
Jiri Kosina86166b72007-05-14 09:57:40 +0200503
504 wake_up_interruptible(&dev->wait);
Jiri Kosinab6787242012-04-27 00:56:08 +0200505 return ret;
Jiri Kosina86166b72007-05-14 09:57:40 +0200506}
507EXPORT_SYMBOL_GPL(hidraw_report_event);
508
509int hidraw_connect(struct hid_device *hid)
510{
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200511 int minor, result;
Jiri Kosina86166b72007-05-14 09:57:40 +0200512 struct hidraw *dev;
513
Jiri Kosina61834532014-01-06 16:43:27 +0100514 /* we accept any HID device, all applications */
Jiri Kosina86166b72007-05-14 09:57:40 +0200515
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200516 dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL);
517 if (!dev)
518 return -ENOMEM;
519
520 result = -EINVAL;
Jiri Kosina86166b72007-05-14 09:57:40 +0200521
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100522 mutex_lock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200523
524 for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) {
525 if (hidraw_table[minor])
526 continue;
527 hidraw_table[minor] = dev;
528 result = 0;
529 break;
530 }
531
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200532 if (result) {
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100533 mutex_unlock(&minors_lock);
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200534 kfree(dev);
Jiri Kosina86166b72007-05-14 09:57:40 +0200535 goto out;
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200536 }
Jiri Kosina86166b72007-05-14 09:57:40 +0200537
Jiri Kosinaaae6c282008-12-04 16:16:46 +0100538 dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
Greg Kroah-Hartmana9b12612008-07-21 20:03:34 -0700539 NULL, "%s%d", "hidraw", minor);
Jiri Kosina86166b72007-05-14 09:57:40 +0200540
541 if (IS_ERR(dev->dev)) {
Jiri Kosina86166b72007-05-14 09:57:40 +0200542 hidraw_table[minor] = NULL;
Oliver Neukum7d672cd2008-10-31 00:07:23 +0100543 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200544 result = PTR_ERR(dev->dev);
Mariusz Kozlowski709d27c2007-09-27 11:24:55 +0200545 kfree(dev);
Jiri Kosina86166b72007-05-14 09:57:40 +0200546 goto out;
547 }
548
549 init_waitqueue_head(&dev->wait);
Yonghua Zheng277fe442013-08-26 23:38:35 +0800550 spin_lock_init(&dev->list_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200551 INIT_LIST_HEAD(&dev->list);
552
553 dev->hid = hid;
554 dev->minor = minor;
555
556 dev->exist = 1;
557 hid->hidraw = dev;
558
Yonghua Zheng8e552e52013-07-30 14:16:10 +0800559 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200560out:
561 return result;
562
563}
564EXPORT_SYMBOL_GPL(hidraw_connect);
565
566void hidraw_disconnect(struct hid_device *hid)
567{
568 struct hidraw *hidraw = hid->hidraw;
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100569
570 mutex_lock(&minors_lock);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100571
Manoj Chourasia212a8712013-07-22 15:33:13 +0530572 drop_ref(hidraw, 1);
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100573
Jiri Kosinadf0cfd62012-11-01 11:33:26 +0100574 mutex_unlock(&minors_lock);
Jiri Kosina86166b72007-05-14 09:57:40 +0200575}
576EXPORT_SYMBOL_GPL(hidraw_disconnect);
577
578int __init hidraw_init(void)
579{
580 int result;
581 dev_t dev_id;
582
583 result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR,
584 HIDRAW_MAX_DEVICES, "hidraw");
Jiri Kosina86166b72007-05-14 09:57:40 +0200585 if (result < 0) {
Joe Perches4291ee32010-12-09 19:29:03 -0800586 pr_warn("can't get major number\n");
Jiri Kosina86166b72007-05-14 09:57:40 +0200587 goto out;
588 }
589
Dan Carpenter6edac6f2016-04-02 07:45:01 +0300590 hidraw_major = MAJOR(dev_id);
591
Jiri Kosina86166b72007-05-14 09:57:40 +0200592 hidraw_class = class_create(THIS_MODULE, "hidraw");
593 if (IS_ERR(hidraw_class)) {
594 result = PTR_ERR(hidraw_class);
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400595 goto error_cdev;
Jiri Kosina86166b72007-05-14 09:57:40 +0200596 }
597
598 cdev_init(&hidraw_cdev, &hidraw_ops);
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400599 result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
600 if (result < 0)
601 goto error_class;
602
Jiri Kosina0f690cc2013-02-19 14:05:34 +0100603 printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n");
Jiri Kosina86166b72007-05-14 09:57:40 +0200604out:
605 return result;
Alexey Khoroshilovbcb4a752012-08-15 23:31:45 +0400606
607error_class:
608 class_destroy(hidraw_class);
609error_cdev:
610 unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
611 goto out;
Jiri Kosina86166b72007-05-14 09:57:40 +0200612}
613
Jiri Slaby140ae3e2008-10-17 18:04:48 +0200614void hidraw_exit(void)
Jiri Kosina86166b72007-05-14 09:57:40 +0200615{
616 dev_t dev_id = MKDEV(hidraw_major, 0);
617
618 cdev_del(&hidraw_cdev);
619 class_destroy(hidraw_class);
620 unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
621
622}