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 | |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame] | 22 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 23 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 33 | #include <linux/slab.h> |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 34 | #include <linux/hid.h> |
| 35 | #include <linux/mutex.h> |
Alexey Dobriyan | a99bbaf | 2009-10-04 16:11:37 +0400 | [diff] [blame] | 36 | #include <linux/sched.h> |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 37 | |
| 38 | #include <linux/hidraw.h> |
| 39 | |
| 40 | static int hidraw_major; |
| 41 | static struct cdev hidraw_cdev; |
| 42 | static struct class *hidraw_class; |
| 43 | static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 44 | static DEFINE_MUTEX(minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 45 | |
| 46 | static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) |
| 47 | { |
| 48 | struct hidraw_list *list = file->private_data; |
| 49 | int ret = 0, len; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 50 | DECLARE_WAITQUEUE(wait, current); |
| 51 | |
Jiri Kosina | b0e1495 | 2009-10-12 11:25:56 +0200 | [diff] [blame] | 52 | mutex_lock(&list->read_mutex); |
| 53 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 54 | while (ret == 0) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 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) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 60 | if (signal_pending(current)) { |
| 61 | ret = -ERESTARTSYS; |
| 62 | break; |
| 63 | } |
| 64 | if (!list->hidraw->exist) { |
| 65 | ret = -EIO; |
| 66 | break; |
| 67 | } |
Founder Fang | 7611e8d | 2012-11-21 15:20:31 +0800 | [diff] [blame] | 68 | if (file->f_flags & O_NONBLOCK) { |
| 69 | ret = -EAGAIN; |
| 70 | break; |
| 71 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 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 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 87 | len = list->buffer[list->tail].len > count ? |
| 88 | count : list->buffer[list->tail].len; |
| 89 | |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 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; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 96 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 97 | |
| 98 | kfree(list->buffer[list->tail].value); |
Matthieu CASTET | 4c7b417 | 2012-06-28 16:51:56 +0200 | [diff] [blame] | 99 | list->buffer[list->tail].value = NULL; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 100 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); |
| 101 | } |
| 102 | out: |
| 103 | mutex_unlock(&list->read_mutex); |
| 104 | return ret; |
| 105 | } |
| 106 | |
Jiri Kosina | d2a1cfe | 2011-03-27 20:29:02 +0200 | [diff] [blame] | 107 | /* The first byte is expected to be a report number. |
| 108 | * This function is to be called with the minors_lock mutex held */ |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 109 | 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] | 110 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 111 | unsigned int minor = iminor(file_inode(file)); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 112 | struct hid_device *dev; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 113 | __u8 *buf; |
| 114 | int ret = 0; |
| 115 | |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 116 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
Antonio Ospite | e42dee9 | 2010-10-05 17:20:17 +0200 | [diff] [blame] | 117 | ret = -ENODEV; |
| 118 | goto out; |
| 119 | } |
| 120 | |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 121 | dev = hidraw_table[minor]->hid; |
| 122 | |
| 123 | if (!dev->hid_output_raw_report) { |
| 124 | ret = -ENODEV; |
| 125 | goto out; |
| 126 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 127 | |
Jiri Kosina | 2b107d6 | 2008-09-17 19:41:58 +0200 | [diff] [blame] | 128 | if (count > HID_MAX_BUFFER_SIZE) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame] | 129 | hid_warn(dev, "pid %d passed too large report\n", |
| 130 | task_pid_nr(current)); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 131 | ret = -EINVAL; |
| 132 | goto out; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | if (count < 2) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame] | 136 | hid_warn(dev, "pid %d passed too short report\n", |
| 137 | task_pid_nr(current)); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 138 | ret = -EINVAL; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 139 | goto out; |
| 140 | } |
| 141 | |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 142 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); |
| 143 | if (!buf) { |
| 144 | ret = -ENOMEM; |
| 145 | goto out; |
| 146 | } |
| 147 | |
| 148 | if (copy_from_user(buf, buffer, count)) { |
| 149 | ret = -EFAULT; |
| 150 | goto out_free; |
| 151 | } |
| 152 | |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 153 | ret = dev->hid_output_raw_report(dev, buf, count, report_type); |
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 | |
| 160 | /* the first byte is expected to be a report number */ |
| 161 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
| 162 | { |
| 163 | ssize_t ret; |
| 164 | mutex_lock(&minors_lock); |
| 165 | ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT); |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 166 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 167 | return ret; |
| 168 | } |
| 169 | |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [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 |
| 175 | * or HID_INPUT_REPORT. This function is to be called with the minors_lock |
| 176 | * mutex held. */ |
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 | |
| 185 | dev = hidraw_table[minor]->hid; |
| 186 | |
| 187 | if (!dev->hid_get_raw_report) { |
| 188 | ret = -ENODEV; |
| 189 | goto out; |
| 190 | } |
| 191 | |
| 192 | if (count > HID_MAX_BUFFER_SIZE) { |
| 193 | printk(KERN_WARNING "hidraw: pid %d passed too large report\n", |
| 194 | task_pid_nr(current)); |
| 195 | ret = -EINVAL; |
| 196 | goto out; |
| 197 | } |
| 198 | |
| 199 | if (count < 2) { |
| 200 | printk(KERN_WARNING "hidraw: pid %d passed too short report\n", |
| 201 | task_pid_nr(current)); |
| 202 | ret = -EINVAL; |
| 203 | goto out; |
| 204 | } |
| 205 | |
| 206 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); |
| 207 | if (!buf) { |
| 208 | ret = -ENOMEM; |
| 209 | goto out; |
| 210 | } |
| 211 | |
| 212 | /* Read the first byte from the user. This is the report number, |
Jiri Kosina | d2a1cfe | 2011-03-27 20:29:02 +0200 | [diff] [blame] | 213 | * which is passed to dev->hid_get_raw_report(). */ |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 214 | if (copy_from_user(&report_number, buffer, 1)) { |
| 215 | ret = -EFAULT; |
| 216 | goto out_free; |
| 217 | } |
| 218 | |
| 219 | ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type); |
| 220 | |
| 221 | if (ret < 0) |
| 222 | goto out_free; |
| 223 | |
| 224 | len = (ret < count) ? ret : count; |
| 225 | |
| 226 | if (copy_to_user(buffer, buf, len)) { |
| 227 | ret = -EFAULT; |
| 228 | goto out_free; |
| 229 | } |
| 230 | |
| 231 | ret = len; |
| 232 | |
| 233 | out_free: |
| 234 | kfree(buf); |
| 235 | out: |
| 236 | return ret; |
| 237 | } |
| 238 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 239 | static unsigned int hidraw_poll(struct file *file, poll_table *wait) |
| 240 | { |
| 241 | struct hidraw_list *list = file->private_data; |
| 242 | |
| 243 | poll_wait(file, &list->hidraw->wait, wait); |
| 244 | if (list->head != list->tail) |
| 245 | return POLLIN | POLLRDNORM; |
| 246 | if (!list->hidraw->exist) |
| 247 | return POLLERR | POLLHUP; |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | static int hidraw_open(struct inode *inode, struct file *file) |
| 252 | { |
| 253 | unsigned int minor = iminor(inode); |
| 254 | struct hidraw *dev; |
| 255 | struct hidraw_list *list; |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 256 | unsigned long flags; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 257 | int err = 0; |
| 258 | |
| 259 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { |
| 260 | err = -ENOMEM; |
| 261 | goto out; |
| 262 | } |
| 263 | |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 264 | mutex_lock(&minors_lock); |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 265 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 266 | err = -ENODEV; |
| 267 | goto out_unlock; |
| 268 | } |
| 269 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 270 | dev = hidraw_table[minor]; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 271 | if (!dev->open++) { |
Dmitry Torokhov | 5bea766 | 2010-12-07 23:02:48 -0800 | [diff] [blame] | 272 | err = hid_hw_power(dev->hid, PM_HINT_FULLON); |
Amit Nagal | f554ff8 | 2011-09-27 13:41:58 -0400 | [diff] [blame] | 273 | if (err < 0) { |
| 274 | dev->open--; |
Dmitry Torokhov | 5bea766 | 2010-12-07 23:02:48 -0800 | [diff] [blame] | 275 | goto out_unlock; |
Amit Nagal | f554ff8 | 2011-09-27 13:41:58 -0400 | [diff] [blame] | 276 | } |
Dmitry Torokhov | 5bea766 | 2010-12-07 23:02:48 -0800 | [diff] [blame] | 277 | |
| 278 | err = hid_hw_open(dev->hid); |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 279 | if (err < 0) { |
Dmitry Torokhov | 5bea766 | 2010-12-07 23:02:48 -0800 | [diff] [blame] | 280 | hid_hw_power(dev->hid, PM_HINT_NORMAL); |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 281 | dev->open--; |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 282 | goto out_unlock; |
Oliver Neukum | 0361a28 | 2008-12-17 15:38:03 +0100 | [diff] [blame] | 283 | } |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 284 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 285 | |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 286 | list->hidraw = hidraw_table[minor]; |
| 287 | mutex_init(&list->read_mutex); |
| 288 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
| 289 | list_add_tail(&list->node, &hidraw_table[minor]->list); |
| 290 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
| 291 | file->private_data = list; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 292 | out_unlock: |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 293 | mutex_unlock(&minors_lock); |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 294 | out: |
Amit Nagal | 1a89623 | 2011-09-07 13:48:47 +0200 | [diff] [blame] | 295 | if (err < 0) |
| 296 | kfree(list); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 297 | return err; |
| 298 | |
| 299 | } |
| 300 | |
Andrew Duggan | b553131 | 2012-11-27 19:02:27 -0800 | [diff] [blame] | 301 | static int hidraw_fasync(int fd, struct file *file, int on) |
| 302 | { |
| 303 | struct hidraw_list *list = file->private_data; |
| 304 | |
| 305 | return fasync_helper(fd, file, on, &list->fasync); |
| 306 | } |
| 307 | |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 308 | static void drop_ref(struct hidraw *hidraw, int exists_bit) |
| 309 | { |
| 310 | if (exists_bit) { |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 311 | hidraw->exist = 0; |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 312 | if (hidraw->open) { |
| 313 | hid_hw_close(hidraw->hid); |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 314 | wake_up_interruptible(&hidraw->wait); |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 315 | } |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 316 | } else { |
| 317 | --hidraw->open; |
| 318 | } |
Manoj Chourasia | 0f5a24c | 2013-10-01 15:39:00 +0530 | [diff] [blame] | 319 | if (!hidraw->open) { |
| 320 | if (!hidraw->exist) { |
| 321 | device_destroy(hidraw_class, |
| 322 | MKDEV(hidraw_major, hidraw->minor)); |
| 323 | hidraw_table[hidraw->minor] = NULL; |
| 324 | kfree(hidraw); |
| 325 | } else { |
| 326 | /* close device for last reader */ |
| 327 | hid_hw_power(hidraw->hid, PM_HINT_NORMAL); |
| 328 | hid_hw_close(hidraw->hid); |
| 329 | } |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 330 | } |
| 331 | } |
| 332 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 333 | static int hidraw_release(struct inode * inode, struct file * file) |
| 334 | { |
| 335 | unsigned int minor = iminor(inode); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 336 | struct hidraw_list *list = file->private_data; |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 337 | unsigned long flags; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 338 | |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 339 | mutex_lock(&minors_lock); |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 340 | |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 341 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 342 | list_del(&list->node); |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 343 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
Jiri Kosina | 4db1c62 | 2008-06-24 14:45:27 +0200 | [diff] [blame] | 344 | kfree(list); |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 345 | |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 346 | drop_ref(hidraw_table[minor], 0); |
| 347 | |
| 348 | mutex_unlock(&minors_lock); |
| 349 | return 0; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 350 | } |
| 351 | |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 352 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
| 353 | unsigned long arg) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 354 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 355 | struct inode *inode = file_inode(file); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 356 | unsigned int minor = iminor(inode); |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 357 | long ret = 0; |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 358 | struct hidraw *dev; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 359 | void __user *user_arg = (void __user*) arg; |
| 360 | |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 361 | mutex_lock(&minors_lock); |
| 362 | dev = hidraw_table[minor]; |
Antonio Ospite | d20d5ff | 2010-10-05 17:20:16 +0200 | [diff] [blame] | 363 | if (!dev) { |
| 364 | ret = -ENODEV; |
| 365 | goto out; |
| 366 | } |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 367 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 368 | switch (cmd) { |
| 369 | case HIDIOCGRDESCSIZE: |
| 370 | if (put_user(dev->hid->rsize, (int __user *)arg)) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 371 | ret = -EFAULT; |
| 372 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 373 | |
| 374 | case HIDIOCGRDESC: |
| 375 | { |
| 376 | __u32 len; |
| 377 | |
| 378 | if (get_user(len, (int __user *)arg)) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 379 | ret = -EFAULT; |
| 380 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) |
| 381 | ret = -EINVAL; |
| 382 | else if (copy_to_user(user_arg + offsetof( |
| 383 | struct hidraw_report_descriptor, |
| 384 | value[0]), |
| 385 | dev->hid->rdesc, |
| 386 | min(dev->hid->rsize, len))) |
| 387 | ret = -EFAULT; |
| 388 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 389 | } |
| 390 | case HIDIOCGRAWINFO: |
| 391 | { |
| 392 | struct hidraw_devinfo dinfo; |
| 393 | |
| 394 | dinfo.bustype = dev->hid->bus; |
| 395 | dinfo.vendor = dev->hid->vendor; |
| 396 | dinfo.product = dev->hid->product; |
| 397 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 398 | ret = -EFAULT; |
| 399 | break; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 400 | } |
| 401 | default: |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 402 | { |
| 403 | struct hid_device *hid = dev->hid; |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 404 | if (_IOC_TYPE(cmd) != 'H') { |
| 405 | ret = -EINVAL; |
| 406 | break; |
| 407 | } |
| 408 | |
| 409 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) { |
| 410 | int len = _IOC_SIZE(cmd); |
| 411 | ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT); |
| 412 | break; |
| 413 | } |
| 414 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) { |
| 415 | int len = _IOC_SIZE(cmd); |
| 416 | ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT); |
| 417 | break; |
| 418 | } |
| 419 | |
| 420 | /* Begin Read-only ioctls. */ |
| 421 | if (_IOC_DIR(cmd) != _IOC_READ) { |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 422 | ret = -EINVAL; |
| 423 | break; |
| 424 | } |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 425 | |
| 426 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { |
Daniel Mack | dd2ed487 | 2011-05-15 18:07:42 +0200 | [diff] [blame] | 427 | int len = strlen(hid->name) + 1; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 428 | if (len > _IOC_SIZE(cmd)) |
| 429 | len = _IOC_SIZE(cmd); |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 430 | ret = copy_to_user(user_arg, hid->name, len) ? |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 431 | -EFAULT : len; |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 432 | break; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { |
Daniel Mack | dd2ed487 | 2011-05-15 18:07:42 +0200 | [diff] [blame] | 436 | int len = strlen(hid->phys) + 1; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 437 | if (len > _IOC_SIZE(cmd)) |
| 438 | len = _IOC_SIZE(cmd); |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 439 | ret = copy_to_user(user_arg, hid->phys, len) ? |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 440 | -EFAULT : len; |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 441 | break; |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 442 | } |
Alan Ott | b4dbde9 | 2011-01-18 03:04:39 -0500 | [diff] [blame] | 443 | } |
Jiri Kosina | 9188e79 | 2008-11-12 16:14:08 +0100 | [diff] [blame] | 444 | |
Dan Carpenter | dfd395af | 2009-02-03 16:35:17 +0300 | [diff] [blame] | 445 | ret = -ENOTTY; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 446 | } |
Antonio Ospite | d20d5ff | 2010-10-05 17:20:16 +0200 | [diff] [blame] | 447 | out: |
Jiri Kosina | 2e57480 | 2010-03-25 14:15:11 +0100 | [diff] [blame] | 448 | mutex_unlock(&minors_lock); |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 449 | return ret; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | static const struct file_operations hidraw_ops = { |
| 453 | .owner = THIS_MODULE, |
| 454 | .read = hidraw_read, |
| 455 | .write = hidraw_write, |
| 456 | .poll = hidraw_poll, |
| 457 | .open = hidraw_open, |
| 458 | .release = hidraw_release, |
Alan Cox | 979c407 | 2008-05-26 11:25:26 +0200 | [diff] [blame] | 459 | .unlocked_ioctl = hidraw_ioctl, |
Andrew Duggan | b553131 | 2012-11-27 19:02:27 -0800 | [diff] [blame] | 460 | .fasync = hidraw_fasync, |
Alan Ott | ae5e49c | 2011-01-04 00:37:22 -0500 | [diff] [blame] | 461 | #ifdef CONFIG_COMPAT |
| 462 | .compat_ioctl = hidraw_ioctl, |
| 463 | #endif |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 464 | .llseek = noop_llseek, |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 465 | }; |
| 466 | |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 467 | int hidraw_report_event(struct hid_device *hid, u8 *data, int len) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 468 | { |
| 469 | struct hidraw *dev = hid->hidraw; |
| 470 | struct hidraw_list *list; |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 471 | int ret = 0; |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 472 | unsigned long flags; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 473 | |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 474 | spin_lock_irqsave(&dev->list_lock, flags); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 475 | list_for_each_entry(list, &dev->list, node) { |
Matthieu CASTET | 4c7b417 | 2012-06-28 16:51:56 +0200 | [diff] [blame] | 476 | int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); |
| 477 | |
| 478 | if (new_head == list->tail) |
| 479 | continue; |
| 480 | |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 481 | if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) { |
| 482 | ret = -ENOMEM; |
| 483 | break; |
| 484 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 485 | list->buffer[list->head].len = len; |
Matthieu CASTET | 4c7b417 | 2012-06-28 16:51:56 +0200 | [diff] [blame] | 486 | list->head = new_head; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 487 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
| 488 | } |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 489 | spin_unlock_irqrestore(&dev->list_lock, flags); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 490 | |
| 491 | wake_up_interruptible(&dev->wait); |
Jiri Kosina | b678724 | 2012-04-27 00:56:08 +0200 | [diff] [blame] | 492 | return ret; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 493 | } |
| 494 | EXPORT_SYMBOL_GPL(hidraw_report_event); |
| 495 | |
| 496 | int hidraw_connect(struct hid_device *hid) |
| 497 | { |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 498 | int minor, result; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 499 | struct hidraw *dev; |
| 500 | |
Jiri Kosina | bbe281f | 2009-06-04 15:44:25 +0200 | [diff] [blame] | 501 | /* we accept any HID device, no matter the applications */ |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 502 | |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 503 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
| 504 | if (!dev) |
| 505 | return -ENOMEM; |
| 506 | |
| 507 | result = -EINVAL; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 508 | |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 509 | mutex_lock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 510 | |
| 511 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { |
| 512 | if (hidraw_table[minor]) |
| 513 | continue; |
| 514 | hidraw_table[minor] = dev; |
| 515 | result = 0; |
| 516 | break; |
| 517 | } |
| 518 | |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 519 | if (result) { |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 520 | mutex_unlock(&minors_lock); |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 521 | kfree(dev); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 522 | goto out; |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 523 | } |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 524 | |
Jiri Kosina | aae6c28 | 2008-12-04 16:16:46 +0100 | [diff] [blame] | 525 | 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] | 526 | NULL, "%s%d", "hidraw", minor); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 527 | |
| 528 | if (IS_ERR(dev->dev)) { |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 529 | hidraw_table[minor] = NULL; |
Oliver Neukum | 7d672cd | 2008-10-31 00:07:23 +0100 | [diff] [blame] | 530 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 531 | result = PTR_ERR(dev->dev); |
Mariusz Kozlowski | 709d27c | 2007-09-27 11:24:55 +0200 | [diff] [blame] | 532 | kfree(dev); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 533 | goto out; |
| 534 | } |
| 535 | |
| 536 | init_waitqueue_head(&dev->wait); |
Yonghua Zheng | 277fe44 | 2013-08-26 23:38:35 +0800 | [diff] [blame] | 537 | spin_lock_init(&dev->list_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 538 | INIT_LIST_HEAD(&dev->list); |
| 539 | |
| 540 | dev->hid = hid; |
| 541 | dev->minor = minor; |
| 542 | |
| 543 | dev->exist = 1; |
| 544 | hid->hidraw = dev; |
| 545 | |
Yonghua Zheng | 8e552e5 | 2013-07-30 14:16:10 +0800 | [diff] [blame] | 546 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 547 | out: |
| 548 | return result; |
| 549 | |
| 550 | } |
| 551 | EXPORT_SYMBOL_GPL(hidraw_connect); |
| 552 | |
| 553 | void hidraw_disconnect(struct hid_device *hid) |
| 554 | { |
| 555 | struct hidraw *hidraw = hid->hidraw; |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 556 | |
| 557 | mutex_lock(&minors_lock); |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 558 | |
Manoj Chourasia | 212a871 | 2013-07-22 15:33:13 +0530 | [diff] [blame] | 559 | drop_ref(hidraw, 1); |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 560 | |
Jiri Kosina | df0cfd6 | 2012-11-01 11:33:26 +0100 | [diff] [blame] | 561 | mutex_unlock(&minors_lock); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 562 | } |
| 563 | EXPORT_SYMBOL_GPL(hidraw_disconnect); |
| 564 | |
| 565 | int __init hidraw_init(void) |
| 566 | { |
| 567 | int result; |
| 568 | dev_t dev_id; |
| 569 | |
| 570 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, |
| 571 | HIDRAW_MAX_DEVICES, "hidraw"); |
| 572 | |
| 573 | hidraw_major = MAJOR(dev_id); |
| 574 | |
| 575 | if (result < 0) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame] | 576 | pr_warn("can't get major number\n"); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 577 | goto out; |
| 578 | } |
| 579 | |
| 580 | hidraw_class = class_create(THIS_MODULE, "hidraw"); |
| 581 | if (IS_ERR(hidraw_class)) { |
| 582 | result = PTR_ERR(hidraw_class); |
Alexey Khoroshilov | bcb4a75 | 2012-08-15 23:31:45 +0400 | [diff] [blame] | 583 | goto error_cdev; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | cdev_init(&hidraw_cdev, &hidraw_ops); |
Alexey Khoroshilov | bcb4a75 | 2012-08-15 23:31:45 +0400 | [diff] [blame] | 587 | result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); |
| 588 | if (result < 0) |
| 589 | goto error_class; |
| 590 | |
Jiri Kosina | 0f690cc | 2013-02-19 14:05:34 +0100 | [diff] [blame] | 591 | printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n"); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 592 | out: |
| 593 | return result; |
Alexey Khoroshilov | bcb4a75 | 2012-08-15 23:31:45 +0400 | [diff] [blame] | 594 | |
| 595 | error_class: |
| 596 | class_destroy(hidraw_class); |
| 597 | error_cdev: |
| 598 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); |
| 599 | goto out; |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 600 | } |
| 601 | |
Jiri Slaby | 140ae3e | 2008-10-17 18:04:48 +0200 | [diff] [blame] | 602 | void hidraw_exit(void) |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 603 | { |
| 604 | dev_t dev_id = MKDEV(hidraw_major, 0); |
| 605 | |
| 606 | cdev_del(&hidraw_cdev); |
| 607 | class_destroy(hidraw_class); |
| 608 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); |
| 609 | |
| 610 | } |