Thomas Gleixner | a32dd67 | 2019-05-29 07:18:11 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 2 | /* |
| 3 | * HID raw devices, giving access to raw HID events. |
| 4 | * |
| 5 | * In comparison to hiddev, this device does not process the |
| 6 | * hid events at all (no parsing, no lookups). This lets applications |
| 7 | * to work on raw hid events as they want to, and avoids a need to |
| 8 | * use a transport-specific userspace libhid/libusb libraries. |
| 9 | * |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 10 | * Copyright (c) 2007-2014 Jiri Kosina |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 11 | */ |
| 12 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 13 | |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame] | 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 15 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 16 | #include <linux/fs.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/cdev.h> |
| 22 | #include <linux/poll.h> |
| 23 | #include <linux/device.h> |
| 24 | #include <linux/major.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 26 | #include <linux/hid.h> |
| 27 | #include <linux/mutex.h> |
Ingo Molnar | 174cd4b | 2017-02-02 19:15:33 +0100 | [diff] [blame] | 28 | #include <linux/sched/signal.h> |
Dmitry Torokhov | 8f507c8 | 2016-03-16 16:59:38 -0700 | [diff] [blame] | 29 | #include <linux/string.h> |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 30 | |
| 31 | #include <linux/hidraw.h> |
| 32 | |
| 33 | static int hidraw_major; |
| 34 | static struct cdev hidraw_cdev; |
| 35 | static struct class *hidraw_class; |
| 36 | static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 37 | static DEFINE_MUTEX(minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 38 | |
| 39 | static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) |
| 40 | { |
| 41 | struct hidraw_list *list = file->private_data; |
| 42 | int ret = 0, len; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 43 | DECLARE_WAITQUEUE(wait, current); |
| 44 | |
Jiri Kosina | b0e1495 | 2009-10-12 11:25:56 +0200 | [diff] [blame] | 45 | mutex_lock(&list->read_mutex); |
| 46 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 47 | while (ret == 0) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 48 | if (list->head == list->tail) { |
| 49 | add_wait_queue(&list->hidraw->wait, &wait); |
| 50 | set_current_state(TASK_INTERRUPTIBLE); |
| 51 | |
| 52 | while (list->head == list->tail) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 53 | if (signal_pending(current)) { |
| 54 | ret = -ERESTARTSYS; |
| 55 | break; |
| 56 | } |
| 57 | if (!list->hidraw->exist) { |
| 58 | ret = -EIO; |
| 59 | break; |
| 60 | } |
Founder Fang | 7611e8d | 2012-11-21 15:20:31 +0800 | [diff] [blame] | 61 | if (file->f_flags & O_NONBLOCK) { |
| 62 | ret = -EAGAIN; |
| 63 | break; |
| 64 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 65 | |
| 66 | /* allow O_NONBLOCK to work well from other threads */ |
| 67 | mutex_unlock(&list->read_mutex); |
| 68 | schedule(); |
| 69 | mutex_lock(&list->read_mutex); |
| 70 | set_current_state(TASK_INTERRUPTIBLE); |
| 71 | } |
| 72 | |
| 73 | set_current_state(TASK_RUNNING); |
| 74 | remove_wait_queue(&list->hidraw->wait, &wait); |
| 75 | } |
| 76 | |
| 77 | if (ret) |
| 78 | goto out; |
| 79 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 80 | len = list->buffer[list->tail].len > count ? |
| 81 | count : list->buffer[list->tail].len; |
| 82 | |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 83 | if (list->buffer[list->tail].value) { |
| 84 | if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { |
| 85 | ret = -EFAULT; |
| 86 | goto out; |
| 87 | } |
| 88 | ret = len; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 89 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 90 | |
| 91 | kfree(list->buffer[list->tail].value); |
Matthieu CASTET | 4c7b417 | 2012-06-28 16:51:56 +0200 | [diff] [blame] | 92 | list->buffer[list->tail].value = NULL; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 93 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); |
| 94 | } |
| 95 | out: |
| 96 | mutex_unlock(&list->read_mutex); |
| 97 | return ret; |
| 98 | } |
| 99 | |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 100 | /* |
| 101 | * The first byte of the report buffer is expected to be a report number. |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 102 | */ |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 103 | static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 104 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 105 | unsigned int minor = iminor(file_inode(file)); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 106 | struct hid_device *dev; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 107 | __u8 *buf; |
| 108 | int ret = 0; |
| 109 | |
Jiri Kosina | cc7ed49 | 2018-11-08 22:38:42 +0100 | [diff] [blame] | 110 | lockdep_assert_held(&minors_lock); |
| 111 | |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 112 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
Antonio Ospite | e42dee9 | 2010-10-05 17:20:17 +0200 | [diff] [blame] | 113 | ret = -ENODEV; |
| 114 | goto out; |
| 115 | } |
| 116 | |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 117 | dev = hidraw_table[minor]->hid; |
| 118 | |
Jiri Kosina | 2b107d6 | 2008-09-17 19:41:58 +0200 | [diff] [blame] | 119 | if (count > HID_MAX_BUFFER_SIZE) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame] | 120 | hid_warn(dev, "pid %d passed too large report\n", |
| 121 | task_pid_nr(current)); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 122 | ret = -EINVAL; |
| 123 | goto out; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | if (count < 2) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame] | 127 | hid_warn(dev, "pid %d passed too short report\n", |
| 128 | task_pid_nr(current)); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 129 | ret = -EINVAL; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 130 | goto out; |
| 131 | } |
| 132 | |
Dmitry Torokhov | 8f507c8 | 2016-03-16 16:59:38 -0700 | [diff] [blame] | 133 | buf = memdup_user(buffer, count); |
| 134 | if (IS_ERR(buf)) { |
| 135 | ret = PTR_ERR(buf); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 136 | goto out; |
| 137 | } |
| 138 | |
Benjamin Tissoires | e534a93 | 2014-03-08 22:52:42 -0500 | [diff] [blame] | 139 | if ((report_type == HID_OUTPUT_REPORT) && |
| 140 | !(dev->quirks & HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP)) { |
Benjamin Tissoires | 3a75b24 | 2014-02-20 15:24:50 -0500 | [diff] [blame] | 141 | ret = hid_hw_output_report(dev, buf, count); |
| 142 | /* |
| 143 | * compatibility with old implementation of USB-HID and I2C-HID: |
| 144 | * if the device does not support receiving output reports, |
| 145 | * on an interrupt endpoint, fallback to SET_REPORT HID command. |
| 146 | */ |
| 147 | if (ret != -ENOSYS) |
| 148 | goto out_free; |
| 149 | } |
| 150 | |
| 151 | ret = hid_hw_raw_request(dev, buf[0], buf, count, report_type, |
| 152 | HID_REQ_SET_REPORT); |
| 153 | |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 154 | out_free: |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 155 | kfree(buf); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 156 | out: |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 157 | return ret; |
| 158 | } |
| 159 | |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 160 | static 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); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 165 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 166 | return ret; |
| 167 | } |
| 168 | |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 169 | |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 170 | /* |
| 171 | * This function performs a Get_Report transfer over the control endpoint |
Jiri Kosina | d2a1cfe | 2011-03-27 20:29:02 +0200 | [diff] [blame] | 172 | * 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 |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 175 | * or HID_INPUT_REPORT. |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 176 | */ |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 177 | static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type) |
| 178 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 179 | unsigned int minor = iminor(file_inode(file)); |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 180 | struct hid_device *dev; |
| 181 | __u8 *buf; |
| 182 | int ret = 0, len; |
| 183 | unsigned char report_number; |
| 184 | |
Jiri Kosina | cc7ed49 | 2018-11-08 22:38:42 +0100 | [diff] [blame] | 185 | lockdep_assert_held(&minors_lock); |
| 186 | |
Rodrigo Rivas Costa | a955358 | 2018-04-06 01:09:36 +0200 | [diff] [blame] | 187 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
| 188 | ret = -ENODEV; |
| 189 | goto out; |
| 190 | } |
| 191 | |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 192 | dev = hidraw_table[minor]->hid; |
| 193 | |
Benjamin Tissoires | cafebc0 | 2014-02-05 16:33:22 -0500 | [diff] [blame] | 194 | if (!dev->ll_driver->raw_request) { |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 195 | ret = -ENODEV; |
| 196 | goto out; |
| 197 | } |
| 198 | |
| 199 | if (count > HID_MAX_BUFFER_SIZE) { |
Rishi Gupta | b05cec6 | 2019-09-20 08:05:01 +0530 | [diff] [blame] | 200 | hid_warn(dev, "pid %d passed too large report\n", |
| 201 | task_pid_nr(current)); |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 202 | ret = -EINVAL; |
| 203 | goto out; |
| 204 | } |
| 205 | |
| 206 | if (count < 2) { |
Rishi Gupta | b05cec6 | 2019-09-20 08:05:01 +0530 | [diff] [blame] | 207 | hid_warn(dev, "pid %d passed too short report\n", |
| 208 | task_pid_nr(current)); |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 209 | ret = -EINVAL; |
| 210 | goto out; |
| 211 | } |
| 212 | |
Kees Cook | 6da2ec5 | 2018-06-12 13:55:00 -0700 | [diff] [blame] | 213 | buf = kmalloc(count, GFP_KERNEL); |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 214 | if (!buf) { |
| 215 | ret = -ENOMEM; |
| 216 | goto out; |
| 217 | } |
| 218 | |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 219 | /* |
| 220 | * Read the first byte from the user. This is the report number, |
Benjamin Tissoires | cafebc0 | 2014-02-05 16:33:22 -0500 | [diff] [blame] | 221 | * which is passed to hid_hw_raw_request(). |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 222 | */ |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 223 | if (copy_from_user(&report_number, buffer, 1)) { |
| 224 | ret = -EFAULT; |
| 225 | goto out_free; |
| 226 | } |
| 227 | |
Benjamin Tissoires | cafebc0 | 2014-02-05 16:33:22 -0500 | [diff] [blame] | 228 | ret = hid_hw_raw_request(dev, report_number, buf, count, report_type, |
| 229 | HID_REQ_GET_REPORT); |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 230 | |
| 231 | if (ret < 0) |
| 232 | goto out_free; |
| 233 | |
| 234 | len = (ret < count) ? ret : count; |
| 235 | |
| 236 | if (copy_to_user(buffer, buf, len)) { |
| 237 | ret = -EFAULT; |
| 238 | goto out_free; |
| 239 | } |
| 240 | |
| 241 | ret = len; |
| 242 | |
| 243 | out_free: |
| 244 | kfree(buf); |
| 245 | out: |
| 246 | return ret; |
| 247 | } |
| 248 | |
Al Viro | afc9a42 | 2017-07-03 06:39:46 -0400 | [diff] [blame] | 249 | static __poll_t hidraw_poll(struct file *file, poll_table *wait) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 250 | { |
| 251 | struct hidraw_list *list = file->private_data; |
| 252 | |
| 253 | poll_wait(file, &list->hidraw->wait, wait); |
| 254 | if (list->head != list->tail) |
Fabian Henneke | 378b803 | 2019-07-09 13:03:37 +0200 | [diff] [blame] | 255 | return EPOLLIN | EPOLLRDNORM | EPOLLOUT; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 256 | if (!list->hidraw->exist) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 257 | return EPOLLERR | EPOLLHUP; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | static int hidraw_open(struct inode *inode, struct file *file) |
| 262 | { |
| 263 | unsigned int minor = iminor(inode); |
| 264 | struct hidraw *dev; |
| 265 | struct hidraw_list *list; |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 266 | unsigned long flags; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 267 | int err = 0; |
| 268 | |
| 269 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { |
| 270 | err = -ENOMEM; |
| 271 | goto out; |
| 272 | } |
| 273 | |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 274 | mutex_lock(&minors_lock); |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 275 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 276 | err = -ENODEV; |
| 277 | goto out_unlock; |
| 278 | } |
| 279 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 280 | dev = hidraw_table[minor]; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 281 | if (!dev->open++) { |
Dmitry Torokhov | 5bea766 | 2010-12-07 23:02:48 -0800 | [diff] [blame] | 282 | err = hid_hw_power(dev->hid, PM_HINT_FULLON); |
Amit Nagal | f554ff8 | 2011-09-27 13:41:58 -0400 | [diff] [blame] | 283 | if (err < 0) { |
| 284 | dev->open--; |
Dmitry Torokhov | 5bea766 | 2010-12-07 23:02:48 -0800 | [diff] [blame] | 285 | goto out_unlock; |
Amit Nagal | f554ff8 | 2011-09-27 13:41:58 -0400 | [diff] [blame] | 286 | } |
Dmitry Torokhov | 5bea766 | 2010-12-07 23:02:48 -0800 | [diff] [blame] | 287 | |
| 288 | err = hid_hw_open(dev->hid); |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 289 | if (err < 0) { |
Dmitry Torokhov | 5bea766 | 2010-12-07 23:02:48 -0800 | [diff] [blame] | 290 | hid_hw_power(dev->hid, PM_HINT_NORMAL); |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 291 | dev->open--; |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 292 | goto out_unlock; |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 293 | } |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 294 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 295 | |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 296 | list->hidraw = hidraw_table[minor]; |
| 297 | mutex_init(&list->read_mutex); |
| 298 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
| 299 | list_add_tail(&list->node, &hidraw_table[minor]->list); |
| 300 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
| 301 | file->private_data = list; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 302 | out_unlock: |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 303 | mutex_unlock(&minors_lock); |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 304 | out: |
Amit Nagal | 1a89623 | 2011-09-07 13:48:47 +0200 | [diff] [blame] | 305 | if (err < 0) |
| 306 | kfree(list); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 307 | return err; |
| 308 | |
| 309 | } |
| 310 | |
Andrew Duggan | b553131 | 2012-11-27 19:02:27 -0800 | [diff] [blame] | 311 | static int hidraw_fasync(int fd, struct file *file, int on) |
| 312 | { |
| 313 | struct hidraw_list *list = file->private_data; |
| 314 | |
| 315 | return fasync_helper(fd, file, on, &list->fasync); |
| 316 | } |
| 317 | |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 318 | static void drop_ref(struct hidraw *hidraw, int exists_bit) |
| 319 | { |
| 320 | if (exists_bit) { |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 321 | hidraw->exist = 0; |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 322 | if (hidraw->open) { |
| 323 | hid_hw_close(hidraw->hid); |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 324 | wake_up_interruptible(&hidraw->wait); |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 325 | } |
Fernando Luis Vázquez Cao | 47587fc | 2014-02-26 16:51:24 +0900 | [diff] [blame] | 326 | device_destroy(hidraw_class, |
| 327 | MKDEV(hidraw_major, hidraw->minor)); |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 328 | } else { |
| 329 | --hidraw->open; |
| 330 | } |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 331 | if (!hidraw->open) { |
| 332 | if (!hidraw->exist) { |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 333 | hidraw_table[hidraw->minor] = NULL; |
| 334 | kfree(hidraw); |
| 335 | } else { |
| 336 | /* close device for last reader */ |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 337 | hid_hw_close(hidraw->hid); |
Dmitry Torokhov | 814b6d1 | 2017-09-19 18:37:46 -0700 | [diff] [blame] | 338 | hid_hw_power(hidraw->hid, PM_HINT_NORMAL); |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 339 | } |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 340 | } |
| 341 | } |
| 342 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 343 | static int hidraw_release(struct inode * inode, struct file * file) |
| 344 | { |
| 345 | unsigned int minor = iminor(inode); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 346 | struct hidraw_list *list = file->private_data; |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 347 | unsigned long flags; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 348 | |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 349 | mutex_lock(&minors_lock); |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 350 | |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 351 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 352 | list_del(&list->node); |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 353 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
Jiri Kosina | 4db1c62 | 2008-06-24 14:45:27 +0200 | [diff] [blame] | 354 | kfree(list); |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 355 | |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 356 | drop_ref(hidraw_table[minor], 0); |
| 357 | |
| 358 | mutex_unlock(&minors_lock); |
| 359 | return 0; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 360 | } |
| 361 | |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 362 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
| 363 | unsigned long arg) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 364 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 365 | struct inode *inode = file_inode(file); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 366 | unsigned int minor = iminor(inode); |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 367 | long ret = 0; |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 368 | struct hidraw *dev; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 369 | void __user *user_arg = (void __user*) arg; |
| 370 | |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 371 | mutex_lock(&minors_lock); |
| 372 | dev = hidraw_table[minor]; |
Alan Stern | 416dacb | 2019-08-21 13:27:12 -0400 | [diff] [blame] | 373 | if (!dev || !dev->exist) { |
Antonio Ospite | d20d5ff | 2010-10-05 17:20:16 +0200 | [diff] [blame] | 374 | ret = -ENODEV; |
| 375 | goto out; |
| 376 | } |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 377 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 378 | switch (cmd) { |
| 379 | case HIDIOCGRDESCSIZE: |
| 380 | if (put_user(dev->hid->rsize, (int __user *)arg)) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 381 | ret = -EFAULT; |
| 382 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 383 | |
| 384 | case HIDIOCGRDESC: |
| 385 | { |
| 386 | __u32 len; |
| 387 | |
| 388 | if (get_user(len, (int __user *)arg)) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 389 | ret = -EFAULT; |
| 390 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) |
| 391 | ret = -EINVAL; |
| 392 | else if (copy_to_user(user_arg + offsetof( |
| 393 | struct hidraw_report_descriptor, |
| 394 | value[0]), |
| 395 | dev->hid->rdesc, |
| 396 | min(dev->hid->rsize, len))) |
| 397 | ret = -EFAULT; |
| 398 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 399 | } |
| 400 | case HIDIOCGRAWINFO: |
| 401 | { |
| 402 | struct hidraw_devinfo dinfo; |
| 403 | |
| 404 | dinfo.bustype = dev->hid->bus; |
| 405 | dinfo.vendor = dev->hid->vendor; |
| 406 | dinfo.product = dev->hid->product; |
| 407 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 408 | ret = -EFAULT; |
| 409 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 410 | } |
| 411 | default: |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 412 | { |
| 413 | struct hid_device *hid = dev->hid; |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 414 | if (_IOC_TYPE(cmd) != 'H') { |
| 415 | ret = -EINVAL; |
| 416 | break; |
| 417 | } |
| 418 | |
| 419 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) { |
| 420 | int len = _IOC_SIZE(cmd); |
| 421 | ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT); |
| 422 | break; |
| 423 | } |
| 424 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) { |
| 425 | int len = _IOC_SIZE(cmd); |
| 426 | ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT); |
| 427 | break; |
| 428 | } |
| 429 | |
| 430 | /* Begin Read-only ioctls. */ |
| 431 | if (_IOC_DIR(cmd) != _IOC_READ) { |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 432 | ret = -EINVAL; |
| 433 | break; |
| 434 | } |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 435 | |
| 436 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { |
Daniel Mack | dd2ed48 | 2011-05-15 18:07:42 +0200 | [diff] [blame] | 437 | int len = strlen(hid->name) + 1; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 438 | if (len > _IOC_SIZE(cmd)) |
| 439 | len = _IOC_SIZE(cmd); |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 440 | ret = copy_to_user(user_arg, hid->name, len) ? |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 441 | -EFAULT : len; |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 442 | break; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { |
Daniel Mack | dd2ed48 | 2011-05-15 18:07:42 +0200 | [diff] [blame] | 446 | int len = strlen(hid->phys) + 1; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 447 | if (len > _IOC_SIZE(cmd)) |
| 448 | len = _IOC_SIZE(cmd); |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 449 | ret = copy_to_user(user_arg, hid->phys, len) ? |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 450 | -EFAULT : len; |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 451 | break; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 452 | } |
Marcel Holtmann | 2f48865 | 2019-12-04 04:41:09 +0100 | [diff] [blame^] | 453 | |
| 454 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWUNIQ(0))) { |
| 455 | int len = strlen(hid->uniq) + 1; |
| 456 | if (len > _IOC_SIZE(cmd)) |
| 457 | len = _IOC_SIZE(cmd); |
| 458 | ret = copy_to_user(user_arg, hid->uniq, len) ? |
| 459 | -EFAULT : len; |
| 460 | break; |
| 461 | } |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 462 | } |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 463 | |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 464 | ret = -ENOTTY; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 465 | } |
Antonio Ospite | d20d5ff | 2010-10-05 17:20:16 +0200 | [diff] [blame] | 466 | out: |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 467 | mutex_unlock(&minors_lock); |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 468 | return ret; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | static const struct file_operations hidraw_ops = { |
| 472 | .owner = THIS_MODULE, |
| 473 | .read = hidraw_read, |
| 474 | .write = hidraw_write, |
| 475 | .poll = hidraw_poll, |
| 476 | .open = hidraw_open, |
| 477 | .release = hidraw_release, |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 478 | .unlocked_ioctl = hidraw_ioctl, |
Andrew Duggan | b553131 | 2012-11-27 19:02:27 -0800 | [diff] [blame] | 479 | .fasync = hidraw_fasync, |
Arnd Bergmann | 1832f2d | 2018-09-11 21:59:08 +0200 | [diff] [blame] | 480 | .compat_ioctl = compat_ptr_ioctl, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 481 | .llseek = noop_llseek, |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 482 | }; |
| 483 | |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 484 | int hidraw_report_event(struct hid_device *hid, u8 *data, int len) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 485 | { |
| 486 | struct hidraw *dev = hid->hidraw; |
| 487 | struct hidraw_list *list; |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 488 | int ret = 0; |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 489 | unsigned long flags; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 490 | |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 491 | spin_lock_irqsave(&dev->list_lock, flags); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 492 | list_for_each_entry(list, &dev->list, node) { |
Matthieu CASTET | 4c7b417 | 2012-06-28 16:51:56 +0200 | [diff] [blame] | 493 | int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); |
| 494 | |
| 495 | if (new_head == list->tail) |
| 496 | continue; |
| 497 | |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 498 | if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) { |
| 499 | ret = -ENOMEM; |
| 500 | break; |
| 501 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 502 | list->buffer[list->head].len = len; |
Matthieu CASTET | 4c7b417 | 2012-06-28 16:51:56 +0200 | [diff] [blame] | 503 | list->head = new_head; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 504 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
| 505 | } |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 506 | spin_unlock_irqrestore(&dev->list_lock, flags); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 507 | |
| 508 | wake_up_interruptible(&dev->wait); |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 509 | return ret; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 510 | } |
| 511 | EXPORT_SYMBOL_GPL(hidraw_report_event); |
| 512 | |
| 513 | int hidraw_connect(struct hid_device *hid) |
| 514 | { |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 515 | int minor, result; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 516 | struct hidraw *dev; |
| 517 | |
Jiri Kosina | 6183453 | 2014-01-06 16:43:27 +0100 | [diff] [blame] | 518 | /* we accept any HID device, all applications */ |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 519 | |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 520 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
| 521 | if (!dev) |
| 522 | return -ENOMEM; |
| 523 | |
| 524 | result = -EINVAL; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 525 | |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 526 | mutex_lock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 527 | |
| 528 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { |
| 529 | if (hidraw_table[minor]) |
| 530 | continue; |
| 531 | hidraw_table[minor] = dev; |
| 532 | result = 0; |
| 533 | break; |
| 534 | } |
| 535 | |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 536 | if (result) { |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 537 | mutex_unlock(&minors_lock); |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 538 | kfree(dev); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 539 | goto out; |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 540 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 541 | |
Jiri Kosina | aae6c28 | 2008-12-04 16:16:46 +0100 | [diff] [blame] | 542 | dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
Greg Kroah-Hartman | a9b1261 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 543 | NULL, "%s%d", "hidraw", minor); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 544 | |
| 545 | if (IS_ERR(dev->dev)) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 546 | hidraw_table[minor] = NULL; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 547 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 548 | result = PTR_ERR(dev->dev); |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 549 | kfree(dev); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 550 | goto out; |
| 551 | } |
| 552 | |
| 553 | init_waitqueue_head(&dev->wait); |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 554 | spin_lock_init(&dev->list_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 555 | INIT_LIST_HEAD(&dev->list); |
| 556 | |
| 557 | dev->hid = hid; |
| 558 | dev->minor = minor; |
| 559 | |
| 560 | dev->exist = 1; |
| 561 | hid->hidraw = dev; |
| 562 | |
Yonghua Zheng | 8e552e5 | 2013-07-30 14:16:10 +0800 | [diff] [blame] | 563 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 564 | out: |
| 565 | return result; |
| 566 | |
| 567 | } |
| 568 | EXPORT_SYMBOL_GPL(hidraw_connect); |
| 569 | |
| 570 | void hidraw_disconnect(struct hid_device *hid) |
| 571 | { |
| 572 | struct hidraw *hidraw = hid->hidraw; |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 573 | |
| 574 | mutex_lock(&minors_lock); |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 575 | |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 576 | drop_ref(hidraw, 1); |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 577 | |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 578 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 579 | } |
| 580 | EXPORT_SYMBOL_GPL(hidraw_disconnect); |
| 581 | |
| 582 | int __init hidraw_init(void) |
| 583 | { |
| 584 | int result; |
| 585 | dev_t dev_id; |
| 586 | |
| 587 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, |
| 588 | HIDRAW_MAX_DEVICES, "hidraw"); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 589 | if (result < 0) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame] | 590 | pr_warn("can't get major number\n"); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 591 | goto out; |
| 592 | } |
| 593 | |
Dan Carpenter | 6edac6f | 2016-04-02 07:45:01 +0300 | [diff] [blame] | 594 | hidraw_major = MAJOR(dev_id); |
| 595 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 596 | hidraw_class = class_create(THIS_MODULE, "hidraw"); |
| 597 | if (IS_ERR(hidraw_class)) { |
| 598 | result = PTR_ERR(hidraw_class); |
Alexey Khoroshilov | bcb4a75 | 2012-08-15 23:31:45 +0400 | [diff] [blame] | 599 | goto error_cdev; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 600 | } |
| 601 | |
| 602 | cdev_init(&hidraw_cdev, &hidraw_ops); |
Alexey Khoroshilov | bcb4a75 | 2012-08-15 23:31:45 +0400 | [diff] [blame] | 603 | result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); |
| 604 | if (result < 0) |
| 605 | goto error_class; |
| 606 | |
Rishi Gupta | b05cec6 | 2019-09-20 08:05:01 +0530 | [diff] [blame] | 607 | pr_info("raw HID events driver (C) Jiri Kosina\n"); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 608 | out: |
| 609 | return result; |
Alexey Khoroshilov | bcb4a75 | 2012-08-15 23:31:45 +0400 | [diff] [blame] | 610 | |
| 611 | error_class: |
| 612 | class_destroy(hidraw_class); |
| 613 | error_cdev: |
| 614 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); |
| 615 | goto out; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 616 | } |
| 617 | |
Jiri Slaby | 140ae3e | 2008-10-17 18:04:48 +0200 | [diff] [blame] | 618 | void hidraw_exit(void) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 619 | { |
| 620 | dev_t dev_id = MKDEV(hidraw_major, 0); |
| 621 | |
| 622 | cdev_del(&hidraw_cdev); |
| 623 | class_destroy(hidraw_class); |
| 624 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); |
| 625 | |
| 626 | } |