Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 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 | #include <linux/fs.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/cdev.h> |
| 28 | #include <linux/poll.h> |
| 29 | #include <linux/device.h> |
| 30 | #include <linux/major.h> |
| 31 | #include <linux/hid.h> |
| 32 | #include <linux/mutex.h> |
Jonathan Corbet | 702e57d | 2008-05-15 10:25:44 -0600 | [diff] [blame] | 33 | #include <linux/smp_lock.h> |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 34 | |
| 35 | #include <linux/hidraw.h> |
| 36 | |
| 37 | static int hidraw_major; |
| 38 | static struct cdev hidraw_cdev; |
| 39 | static struct class *hidraw_class; |
| 40 | static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 41 | static DEFINE_MUTEX(minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 42 | |
| 43 | static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) |
| 44 | { |
| 45 | struct hidraw_list *list = file->private_data; |
| 46 | int ret = 0, len; |
| 47 | char *report; |
| 48 | DECLARE_WAITQUEUE(wait, current); |
| 49 | |
| 50 | while (ret == 0) { |
| 51 | |
| 52 | mutex_lock(&list->read_mutex); |
| 53 | |
| 54 | if (list->head == list->tail) { |
| 55 | add_wait_queue(&list->hidraw->wait, &wait); |
| 56 | set_current_state(TASK_INTERRUPTIBLE); |
| 57 | |
| 58 | while (list->head == list->tail) { |
| 59 | if (file->f_flags & O_NONBLOCK) { |
| 60 | ret = -EAGAIN; |
| 61 | break; |
| 62 | } |
| 63 | if (signal_pending(current)) { |
| 64 | ret = -ERESTARTSYS; |
| 65 | break; |
| 66 | } |
| 67 | if (!list->hidraw->exist) { |
| 68 | ret = -EIO; |
| 69 | break; |
| 70 | } |
| 71 | |
| 72 | /* allow O_NONBLOCK to work well from other threads */ |
| 73 | mutex_unlock(&list->read_mutex); |
| 74 | schedule(); |
| 75 | mutex_lock(&list->read_mutex); |
| 76 | set_current_state(TASK_INTERRUPTIBLE); |
| 77 | } |
| 78 | |
| 79 | set_current_state(TASK_RUNNING); |
| 80 | remove_wait_queue(&list->hidraw->wait, &wait); |
| 81 | } |
| 82 | |
| 83 | if (ret) |
| 84 | goto out; |
| 85 | |
| 86 | report = list->buffer[list->tail].value; |
| 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 | } |
| 99 | out: |
| 100 | mutex_unlock(&list->read_mutex); |
| 101 | return ret; |
| 102 | } |
| 103 | |
| 104 | /* the first byte is expected to be a report number */ |
| 105 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
| 106 | { |
| 107 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 108 | /* FIXME: What stops hidraw_table going NULL */ |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 109 | struct hid_device *dev = hidraw_table[minor]->hid; |
| 110 | __u8 *buf; |
| 111 | int ret = 0; |
| 112 | |
| 113 | if (!dev->hid_output_raw_report) |
| 114 | return -ENODEV; |
| 115 | |
Jiri Kosina | 2b107d6 | 2008-09-17 19:41:58 +0200 | [diff] [blame] | 116 | if (count > HID_MAX_BUFFER_SIZE) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 117 | printk(KERN_WARNING "hidraw: pid %d passed too large report\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 118 | task_pid_nr(current)); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 119 | return -EINVAL; |
| 120 | } |
| 121 | |
| 122 | if (count < 2) { |
| 123 | printk(KERN_WARNING "hidraw: pid %d passed too short report\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 124 | task_pid_nr(current)); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 125 | return -EINVAL; |
| 126 | } |
| 127 | |
| 128 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); |
| 129 | if (!buf) |
| 130 | return -ENOMEM; |
| 131 | |
| 132 | if (copy_from_user(buf, buffer, count)) { |
| 133 | ret = -EFAULT; |
| 134 | goto out; |
| 135 | } |
| 136 | |
| 137 | ret = dev->hid_output_raw_report(dev, buf, count); |
| 138 | out: |
| 139 | kfree(buf); |
| 140 | return ret; |
| 141 | } |
| 142 | |
| 143 | static unsigned int hidraw_poll(struct file *file, poll_table *wait) |
| 144 | { |
| 145 | struct hidraw_list *list = file->private_data; |
| 146 | |
| 147 | poll_wait(file, &list->hidraw->wait, wait); |
| 148 | if (list->head != list->tail) |
| 149 | return POLLIN | POLLRDNORM; |
| 150 | if (!list->hidraw->exist) |
| 151 | return POLLERR | POLLHUP; |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static int hidraw_open(struct inode *inode, struct file *file) |
| 156 | { |
| 157 | unsigned int minor = iminor(inode); |
| 158 | struct hidraw *dev; |
| 159 | struct hidraw_list *list; |
| 160 | int err = 0; |
| 161 | |
| 162 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { |
| 163 | err = -ENOMEM; |
| 164 | goto out; |
| 165 | } |
| 166 | |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 167 | lock_kernel(); |
| 168 | mutex_lock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 169 | if (!hidraw_table[minor]) { |
| 170 | printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n", |
| 171 | minor); |
| 172 | kfree(list); |
| 173 | err = -ENODEV; |
| 174 | goto out_unlock; |
| 175 | } |
| 176 | |
| 177 | list->hidraw = hidraw_table[minor]; |
| 178 | mutex_init(&list->read_mutex); |
| 179 | list_add_tail(&list->node, &hidraw_table[minor]->list); |
| 180 | file->private_data = list; |
| 181 | |
| 182 | dev = hidraw_table[minor]; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 183 | if (!dev->open++) { |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 184 | if (dev->hid->ll_driver->power) { |
| 185 | err = dev->hid->ll_driver->power(dev->hid, PM_HINT_FULLON); |
| 186 | if (err < 0) |
| 187 | goto out_unlock; |
| 188 | } |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 189 | err = dev->hid->ll_driver->open(dev->hid); |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 190 | if (err < 0) { |
| 191 | if (dev->hid->ll_driver->power) |
| 192 | dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL); |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 193 | dev->open--; |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 194 | } |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 195 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 196 | |
| 197 | out_unlock: |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 198 | mutex_unlock(&minors_lock); |
Jonathan Corbet | 702e57d | 2008-05-15 10:25:44 -0600 | [diff] [blame] | 199 | unlock_kernel(); |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 200 | out: |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 201 | return err; |
| 202 | |
| 203 | } |
| 204 | |
| 205 | static int hidraw_release(struct inode * inode, struct file * file) |
| 206 | { |
| 207 | unsigned int minor = iminor(inode); |
| 208 | struct hidraw *dev; |
| 209 | struct hidraw_list *list = file->private_data; |
| 210 | |
| 211 | if (!hidraw_table[minor]) { |
| 212 | printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n", |
| 213 | minor); |
| 214 | return -ENODEV; |
| 215 | } |
| 216 | |
| 217 | list_del(&list->node); |
| 218 | dev = hidraw_table[minor]; |
Oliver Neukum | b8a832b | 2008-12-15 13:12:08 +0100 | [diff] [blame] | 219 | if (!--dev->open) { |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 220 | if (list->hidraw->exist) { |
| 221 | if (dev->hid->ll_driver->power) |
| 222 | dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL); |
Jiri Slaby | c500c97 | 2008-05-16 11:49:16 +0200 | [diff] [blame] | 223 | dev->hid->ll_driver->close(dev->hid); |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 224 | } else { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 225 | kfree(list->hidraw); |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 226 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 227 | } |
| 228 | |
Jiri Kosina | 4db1c62 | 2008-06-24 14:45:27 +0200 | [diff] [blame] | 229 | kfree(list); |
| 230 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 231 | return 0; |
| 232 | } |
| 233 | |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 234 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
| 235 | unsigned long arg) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 236 | { |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 237 | struct inode *inode = file->f_path.dentry->d_inode; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 238 | unsigned int minor = iminor(inode); |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 239 | long ret = 0; |
| 240 | /* FIXME: What stops hidraw_table going NULL */ |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 241 | struct hidraw *dev = hidraw_table[minor]; |
| 242 | void __user *user_arg = (void __user*) arg; |
| 243 | |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 244 | lock_kernel(); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 245 | switch (cmd) { |
| 246 | case HIDIOCGRDESCSIZE: |
| 247 | if (put_user(dev->hid->rsize, (int __user *)arg)) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 248 | ret = -EFAULT; |
| 249 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 250 | |
| 251 | case HIDIOCGRDESC: |
| 252 | { |
| 253 | __u32 len; |
| 254 | |
| 255 | if (get_user(len, (int __user *)arg)) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 256 | ret = -EFAULT; |
| 257 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) |
| 258 | ret = -EINVAL; |
| 259 | else if (copy_to_user(user_arg + offsetof( |
| 260 | struct hidraw_report_descriptor, |
| 261 | value[0]), |
| 262 | dev->hid->rdesc, |
| 263 | min(dev->hid->rsize, len))) |
| 264 | ret = -EFAULT; |
| 265 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 266 | } |
| 267 | case HIDIOCGRAWINFO: |
| 268 | { |
| 269 | struct hidraw_devinfo dinfo; |
| 270 | |
| 271 | dinfo.bustype = dev->hid->bus; |
| 272 | dinfo.vendor = dev->hid->vendor; |
| 273 | dinfo.product = dev->hid->product; |
| 274 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 275 | ret = -EFAULT; |
| 276 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 277 | } |
| 278 | default: |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 279 | { |
| 280 | struct hid_device *hid = dev->hid; |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 281 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) { |
| 282 | ret = -EINVAL; |
| 283 | break; |
| 284 | } |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 285 | |
| 286 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { |
| 287 | int len; |
Dan Carpenter | 38089c6 | 2009-04-07 16:35:56 +0200 | [diff] [blame] | 288 | if (!hid->name) { |
| 289 | ret = 0; |
| 290 | break; |
| 291 | } |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 292 | len = strlen(hid->name) + 1; |
| 293 | if (len > _IOC_SIZE(cmd)) |
| 294 | len = _IOC_SIZE(cmd); |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 295 | ret = copy_to_user(user_arg, hid->name, len) ? |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 296 | -EFAULT : len; |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 297 | break; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { |
| 301 | int len; |
Dan Carpenter | 38089c6 | 2009-04-07 16:35:56 +0200 | [diff] [blame] | 302 | if (!hid->phys) { |
| 303 | ret = 0; |
| 304 | break; |
| 305 | } |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 306 | len = strlen(hid->phys) + 1; |
| 307 | if (len > _IOC_SIZE(cmd)) |
| 308 | len = _IOC_SIZE(cmd); |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 309 | ret = copy_to_user(user_arg, hid->phys, len) ? |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 310 | -EFAULT : len; |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 311 | break; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 312 | } |
| 313 | } |
| 314 | |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 315 | ret = -ENOTTY; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 316 | } |
Jiri Slaby | 0f2c594 | 2008-10-23 01:47:30 +0200 | [diff] [blame] | 317 | unlock_kernel(); |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 318 | return ret; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | static const struct file_operations hidraw_ops = { |
| 322 | .owner = THIS_MODULE, |
| 323 | .read = hidraw_read, |
| 324 | .write = hidraw_write, |
| 325 | .poll = hidraw_poll, |
| 326 | .open = hidraw_open, |
| 327 | .release = hidraw_release, |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 328 | .unlocked_ioctl = hidraw_ioctl, |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 329 | }; |
| 330 | |
| 331 | void hidraw_report_event(struct hid_device *hid, u8 *data, int len) |
| 332 | { |
| 333 | struct hidraw *dev = hid->hidraw; |
| 334 | struct hidraw_list *list; |
| 335 | |
| 336 | list_for_each_entry(list, &dev->list, node) { |
| 337 | list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC); |
| 338 | list->buffer[list->head].len = len; |
| 339 | list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); |
| 340 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
| 341 | } |
| 342 | |
| 343 | wake_up_interruptible(&dev->wait); |
| 344 | } |
| 345 | EXPORT_SYMBOL_GPL(hidraw_report_event); |
| 346 | |
| 347 | int hidraw_connect(struct hid_device *hid) |
| 348 | { |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 349 | int minor, result; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 350 | struct hidraw *dev; |
| 351 | |
| 352 | /* TODO currently we accept any HID device. This should later |
| 353 | * probably be fixed to accept only those devices which provide |
| 354 | * non-input applications |
| 355 | */ |
| 356 | |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 357 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
| 358 | if (!dev) |
| 359 | return -ENOMEM; |
| 360 | |
| 361 | result = -EINVAL; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 362 | |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 363 | mutex_lock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 364 | |
| 365 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { |
| 366 | if (hidraw_table[minor]) |
| 367 | continue; |
| 368 | hidraw_table[minor] = dev; |
| 369 | result = 0; |
| 370 | break; |
| 371 | } |
| 372 | |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 373 | if (result) { |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 374 | mutex_unlock(&minors_lock); |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 375 | kfree(dev); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 376 | goto out; |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 377 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 378 | |
Jiri Kosina | aae6c28 | 2008-12-04 16:16:46 +0100 | [diff] [blame] | 379 | 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] | 380 | NULL, "%s%d", "hidraw", minor); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 381 | |
| 382 | if (IS_ERR(dev->dev)) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 383 | hidraw_table[minor] = NULL; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 384 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 385 | result = PTR_ERR(dev->dev); |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 386 | kfree(dev); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 387 | goto out; |
| 388 | } |
| 389 | |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 390 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 391 | init_waitqueue_head(&dev->wait); |
| 392 | INIT_LIST_HEAD(&dev->list); |
| 393 | |
| 394 | dev->hid = hid; |
| 395 | dev->minor = minor; |
| 396 | |
| 397 | dev->exist = 1; |
| 398 | hid->hidraw = dev; |
| 399 | |
| 400 | out: |
| 401 | return result; |
| 402 | |
| 403 | } |
| 404 | EXPORT_SYMBOL_GPL(hidraw_connect); |
| 405 | |
| 406 | void hidraw_disconnect(struct hid_device *hid) |
| 407 | { |
| 408 | struct hidraw *hidraw = hid->hidraw; |
| 409 | |
| 410 | hidraw->exist = 0; |
| 411 | |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 412 | mutex_lock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 413 | hidraw_table[hidraw->minor] = NULL; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 414 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 415 | |
| 416 | device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor)); |
| 417 | |
| 418 | if (hidraw->open) { |
Jiri Slaby | c500c97 | 2008-05-16 11:49:16 +0200 | [diff] [blame] | 419 | hid->ll_driver->close(hid); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 420 | wake_up_interruptible(&hidraw->wait); |
| 421 | } else { |
| 422 | kfree(hidraw); |
| 423 | } |
| 424 | } |
| 425 | EXPORT_SYMBOL_GPL(hidraw_disconnect); |
| 426 | |
| 427 | int __init hidraw_init(void) |
| 428 | { |
| 429 | int result; |
| 430 | dev_t dev_id; |
| 431 | |
| 432 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, |
| 433 | HIDRAW_MAX_DEVICES, "hidraw"); |
| 434 | |
| 435 | hidraw_major = MAJOR(dev_id); |
| 436 | |
| 437 | if (result < 0) { |
| 438 | printk(KERN_WARNING "hidraw: can't get major number\n"); |
| 439 | result = 0; |
| 440 | goto out; |
| 441 | } |
| 442 | |
| 443 | hidraw_class = class_create(THIS_MODULE, "hidraw"); |
| 444 | if (IS_ERR(hidraw_class)) { |
| 445 | result = PTR_ERR(hidraw_class); |
| 446 | unregister_chrdev(hidraw_major, "hidraw"); |
| 447 | goto out; |
| 448 | } |
| 449 | |
| 450 | cdev_init(&hidraw_cdev, &hidraw_ops); |
| 451 | cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); |
| 452 | out: |
| 453 | return result; |
| 454 | } |
| 455 | |
Jiri Slaby | 140ae3e | 2008-10-17 18:04:48 +0200 | [diff] [blame] | 456 | void hidraw_exit(void) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 457 | { |
| 458 | dev_t dev_id = MKDEV(hidraw_major, 0); |
| 459 | |
| 460 | cdev_del(&hidraw_cdev); |
| 461 | class_destroy(hidraw_class); |
| 462 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); |
| 463 | |
| 464 | } |