Commit | Line | Data |
---|---|---|
9fff0425 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ab841160 | 2 | /* |
b4a6700c | 3 | * Copyright (c) 2003-2020, Intel Corporation. All rights reserved. |
ab841160 | 4 | * Intel Management Engine Interface (Intel MEI) Linux driver |
ab841160 | 5 | */ |
9fff0425 | 6 | |
ab841160 OW |
7 | #include <linux/module.h> |
8 | #include <linux/moduleparam.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/device.h> | |
1f180359 | 11 | #include <linux/slab.h> |
ab841160 OW |
12 | #include <linux/fs.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/fcntl.h> | |
ab841160 OW |
16 | #include <linux/poll.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/ioctl.h> | |
19 | #include <linux/cdev.h> | |
174cd4b1 | 20 | #include <linux/sched/signal.h> |
ab841160 OW |
21 | #include <linux/uuid.h> |
22 | #include <linux/compat.h> | |
23 | #include <linux/jiffies.h> | |
24 | #include <linux/interrupt.h> | |
25 | ||
4f3afe1d | 26 | #include <linux/mei.h> |
47a73801 TW |
27 | |
28 | #include "mei_dev.h" | |
90e0b5f1 | 29 | #include "client.h" |
ab841160 | 30 | |
43b8a7ed AU |
31 | static struct class *mei_class; |
32 | static dev_t mei_devt; | |
33 | #define MEI_MAX_DEVS MINORMASK | |
34 | static DEFINE_MUTEX(mei_minor_lock); | |
35 | static DEFINE_IDR(mei_idr); | |
36 | ||
ab841160 OW |
37 | /** |
38 | * mei_open - the open function | |
39 | * | |
40 | * @inode: pointer to inode structure | |
41 | * @file: pointer to file structure | |
83ce0741 | 42 | * |
a8605ea2 | 43 | * Return: 0 on success, <0 on error |
ab841160 OW |
44 | */ |
45 | static int mei_open(struct inode *inode, struct file *file) | |
46 | { | |
ab841160 | 47 | struct mei_device *dev; |
f3d8e878 | 48 | struct mei_cl *cl; |
2703d4b2 | 49 | |
6f37aca8 | 50 | int err; |
ab841160 | 51 | |
f3d8e878 | 52 | dev = container_of(inode->i_cdev, struct mei_device, cdev); |
5b881e3c | 53 | if (!dev) |
e036cc57 | 54 | return -ENODEV; |
ab841160 OW |
55 | |
56 | mutex_lock(&dev->device_lock); | |
e036cc57 | 57 | |
b210d750 | 58 | if (dev->dev_state != MEI_DEV_ENABLED) { |
2bf94cab | 59 | dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n", |
b210d750 | 60 | mei_dev_state_str(dev->dev_state)); |
03b8d341 | 61 | err = -ENODEV; |
e036cc57 | 62 | goto err_unlock; |
1b812947 | 63 | } |
ab841160 | 64 | |
7851e008 | 65 | cl = mei_cl_alloc_linked(dev); |
03b8d341 TW |
66 | if (IS_ERR(cl)) { |
67 | err = PTR_ERR(cl); | |
e036cc57 | 68 | goto err_unlock; |
03b8d341 | 69 | } |
ab841160 | 70 | |
97d549b4 | 71 | cl->fp = file; |
ab841160 | 72 | file->private_data = cl; |
e036cc57 | 73 | |
ab841160 OW |
74 | mutex_unlock(&dev->device_lock); |
75 | ||
5b881e3c | 76 | return nonseekable_open(inode, file); |
ab841160 | 77 | |
e036cc57 | 78 | err_unlock: |
ab841160 | 79 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
80 | return err; |
81 | } | |
82 | ||
f35fe5f4 AU |
83 | /** |
84 | * mei_cl_vtag_remove_by_fp - remove vtag that corresponds to fp from list | |
85 | * | |
86 | * @cl: host client | |
87 | * @fp: pointer to file structure | |
88 | * | |
89 | */ | |
90 | static void mei_cl_vtag_remove_by_fp(const struct mei_cl *cl, | |
91 | const struct file *fp) | |
92 | { | |
93 | struct mei_cl_vtag *vtag_l, *next; | |
94 | ||
95 | list_for_each_entry_safe(vtag_l, next, &cl->vtag_map, list) { | |
96 | if (vtag_l->fp == fp) { | |
97 | list_del(&vtag_l->list); | |
98 | kfree(vtag_l); | |
99 | return; | |
100 | } | |
101 | } | |
102 | } | |
103 | ||
ab841160 OW |
104 | /** |
105 | * mei_release - the release function | |
106 | * | |
107 | * @inode: pointer to inode structure | |
108 | * @file: pointer to file structure | |
109 | * | |
a8605ea2 | 110 | * Return: 0 on success, <0 on error |
ab841160 OW |
111 | */ |
112 | static int mei_release(struct inode *inode, struct file *file) | |
113 | { | |
114 | struct mei_cl *cl = file->private_data; | |
ab841160 | 115 | struct mei_device *dev; |
3c666182 | 116 | int rets; |
ab841160 OW |
117 | |
118 | if (WARN_ON(!cl || !cl->dev)) | |
119 | return -ENODEV; | |
120 | ||
121 | dev = cl->dev; | |
122 | ||
123 | mutex_lock(&dev->device_lock); | |
394a77d0 | 124 | |
f35fe5f4 AU |
125 | mei_cl_vtag_remove_by_fp(cl, file); |
126 | ||
127 | if (!list_empty(&cl->vtag_map)) { | |
128 | cl_dbg(dev, cl, "not the last vtag\n"); | |
129 | mei_cl_flush_queues(cl, file); | |
130 | rets = 0; | |
131 | goto out; | |
132 | } | |
133 | ||
3c666182 | 134 | rets = mei_cl_disconnect(cl); |
f35fe5f4 AU |
135 | /* |
136 | * Check again: This is necessary since disconnect releases the lock | |
137 | * and another client can connect in the meantime. | |
138 | */ | |
139 | if (!list_empty(&cl->vtag_map)) { | |
140 | cl_dbg(dev, cl, "not the last vtag after disconnect\n"); | |
141 | mei_cl_flush_queues(cl, file); | |
142 | goto out; | |
143 | } | |
3c666182 | 144 | |
f35fe5f4 | 145 | mei_cl_flush_queues(cl, NULL); |
46922186 | 146 | cl_dbg(dev, cl, "removing\n"); |
a562d5c2 | 147 | |
90e0b5f1 | 148 | mei_cl_unlink(cl); |
f35fe5f4 | 149 | kfree(cl); |
a562d5c2 | 150 | |
f35fe5f4 | 151 | out: |
a562d5c2 | 152 | file->private_data = NULL; |
ab841160 | 153 | |
ab841160 OW |
154 | mutex_unlock(&dev->device_lock); |
155 | return rets; | |
156 | } | |
157 | ||
158 | ||
159 | /** | |
160 | * mei_read - the read function. | |
161 | * | |
162 | * @file: pointer to file structure | |
163 | * @ubuf: pointer to user buffer | |
164 | * @length: buffer length | |
165 | * @offset: data offset in buffer | |
166 | * | |
a8605ea2 | 167 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
168 | */ |
169 | static ssize_t mei_read(struct file *file, char __user *ubuf, | |
441ab50f | 170 | size_t length, loff_t *offset) |
ab841160 OW |
171 | { |
172 | struct mei_cl *cl = file->private_data; | |
ab841160 | 173 | struct mei_device *dev; |
a9bed610 | 174 | struct mei_cl_cb *cb = NULL; |
ff1586a7 | 175 | bool nonblock = !!(file->f_flags & O_NONBLOCK); |
5151e2b5 | 176 | ssize_t rets; |
ab841160 OW |
177 | |
178 | if (WARN_ON(!cl || !cl->dev)) | |
179 | return -ENODEV; | |
180 | ||
181 | dev = cl->dev; | |
182 | ||
dd5de1f1 | 183 | |
ab841160 | 184 | mutex_lock(&dev->device_lock); |
b210d750 | 185 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
186 | rets = -ENODEV; |
187 | goto out; | |
188 | } | |
189 | ||
dd5de1f1 TW |
190 | if (length == 0) { |
191 | rets = 0; | |
192 | goto out; | |
193 | } | |
194 | ||
8b2458f4 AU |
195 | if (ubuf == NULL) { |
196 | rets = -EMSGSIZE; | |
197 | goto out; | |
198 | } | |
199 | ||
a9bed610 | 200 | cb = mei_cl_read_cb(cl, file); |
8b2458f4 AU |
201 | if (cb) |
202 | goto copy_buffer; | |
203 | ||
204 | if (*offset > 0) | |
ab841160 | 205 | *offset = 0; |
ab841160 | 206 | |
ff1586a7 AU |
207 | rets = mei_cl_read_start(cl, length, file); |
208 | if (rets && rets != -EBUSY) { | |
5151e2b5 | 209 | cl_dbg(dev, cl, "mei start read failure status = %zd\n", rets); |
ab841160 OW |
210 | goto out; |
211 | } | |
212 | ||
ff1586a7 AU |
213 | if (nonblock) { |
214 | rets = -EAGAIN; | |
215 | goto out; | |
216 | } | |
217 | ||
cb97fbbc AU |
218 | mutex_unlock(&dev->device_lock); |
219 | if (wait_event_interruptible(cl->rx_wait, | |
d1376f3d | 220 | mei_cl_read_cb(cl, file) || |
cb97fbbc AU |
221 | !mei_cl_is_connected(cl))) { |
222 | if (signal_pending(current)) | |
223 | return -EINTR; | |
224 | return -ERESTARTSYS; | |
225 | } | |
226 | mutex_lock(&dev->device_lock); | |
e2b31644 | 227 | |
cb97fbbc AU |
228 | if (!mei_cl_is_connected(cl)) { |
229 | rets = -ENODEV; | |
230 | goto out; | |
231 | } | |
ab841160 | 232 | |
cb97fbbc AU |
233 | cb = mei_cl_read_cb(cl, file); |
234 | if (!cb) { | |
cb97fbbc AU |
235 | rets = 0; |
236 | goto out; | |
237 | } | |
3d33ff24 | 238 | |
ab841160 | 239 | copy_buffer: |
3d33ff24 TW |
240 | /* now copy the data to user space */ |
241 | if (cb->status) { | |
242 | rets = cb->status; | |
5151e2b5 | 243 | cl_dbg(dev, cl, "read operation failed %zd\n", rets); |
3d33ff24 TW |
244 | goto free; |
245 | } | |
246 | ||
35bf7692 | 247 | cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", |
8b2458f4 AU |
248 | cb->buf.size, cb->buf_idx, *offset); |
249 | if (*offset >= cb->buf_idx) { | |
250 | rets = 0; | |
ab841160 OW |
251 | goto free; |
252 | } | |
253 | ||
ebb108ef TW |
254 | /* length is being truncated to PAGE_SIZE, |
255 | * however buf_idx may point beyond that */ | |
256 | length = min_t(size_t, length, cb->buf_idx - *offset); | |
ab841160 | 257 | |
5db7514d | 258 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
2bf94cab | 259 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
ab841160 OW |
260 | rets = -EFAULT; |
261 | goto free; | |
262 | } | |
263 | ||
264 | rets = length; | |
265 | *offset += length; | |
f862b6b2 TW |
266 | /* not all data was read, keep the cb */ |
267 | if (*offset < cb->buf_idx) | |
ab841160 OW |
268 | goto out; |
269 | ||
270 | free: | |
d1376f3d | 271 | mei_cl_del_rd_completed(cl, cb); |
8b2458f4 | 272 | *offset = 0; |
928fa666 | 273 | |
ab841160 | 274 | out: |
5151e2b5 | 275 | cl_dbg(dev, cl, "end mei read rets = %zd\n", rets); |
ab841160 OW |
276 | mutex_unlock(&dev->device_lock); |
277 | return rets; | |
278 | } | |
f35fe5f4 AU |
279 | |
280 | /** | |
281 | * mei_cl_vtag_by_fp - obtain the vtag by file pointer | |
282 | * | |
283 | * @cl: host client | |
284 | * @fp: pointer to file structure | |
285 | * | |
286 | * Return: vtag value on success, otherwise 0 | |
287 | */ | |
288 | static u8 mei_cl_vtag_by_fp(const struct mei_cl *cl, const struct file *fp) | |
289 | { | |
290 | struct mei_cl_vtag *cl_vtag; | |
291 | ||
292 | if (!fp) | |
293 | return 0; | |
294 | ||
295 | list_for_each_entry(cl_vtag, &cl->vtag_map, list) | |
296 | if (cl_vtag->fp == fp) | |
297 | return cl_vtag->vtag; | |
298 | return 0; | |
299 | } | |
300 | ||
ab841160 OW |
301 | /** |
302 | * mei_write - the write function. | |
303 | * | |
304 | * @file: pointer to file structure | |
305 | * @ubuf: pointer to user buffer | |
306 | * @length: buffer length | |
307 | * @offset: data offset in buffer | |
308 | * | |
a8605ea2 | 309 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
310 | */ |
311 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
441ab50f | 312 | size_t length, loff_t *offset) |
ab841160 OW |
313 | { |
314 | struct mei_cl *cl = file->private_data; | |
6cbb097f | 315 | struct mei_cl_cb *cb; |
ab841160 | 316 | struct mei_device *dev; |
5151e2b5 | 317 | ssize_t rets; |
ab841160 OW |
318 | |
319 | if (WARN_ON(!cl || !cl->dev)) | |
320 | return -ENODEV; | |
321 | ||
322 | dev = cl->dev; | |
323 | ||
324 | mutex_lock(&dev->device_lock); | |
325 | ||
b210d750 | 326 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 327 | rets = -ENODEV; |
4234a6de | 328 | goto out; |
ab841160 OW |
329 | } |
330 | ||
d49ed64a AU |
331 | if (!mei_cl_is_connected(cl)) { |
332 | cl_err(dev, cl, "is not connected"); | |
333 | rets = -ENODEV; | |
4234a6de | 334 | goto out; |
75f0ee15 | 335 | } |
dd5de1f1 | 336 | |
d49ed64a AU |
337 | if (!mei_me_cl_is_active(cl->me_cl)) { |
338 | rets = -ENOTTY; | |
dd5de1f1 TW |
339 | goto out; |
340 | } | |
341 | ||
d49ed64a | 342 | if (length > mei_cl_mtu(cl)) { |
dd5de1f1 | 343 | rets = -EFBIG; |
4234a6de | 344 | goto out; |
75f0ee15 TW |
345 | } |
346 | ||
d49ed64a AU |
347 | if (length == 0) { |
348 | rets = 0; | |
4234a6de | 349 | goto out; |
75f0ee15 | 350 | } |
d49ed64a | 351 | |
af336cab AU |
352 | while (cl->tx_cb_queued >= dev->tx_queue_limit) { |
353 | if (file->f_flags & O_NONBLOCK) { | |
354 | rets = -EAGAIN; | |
355 | goto out; | |
356 | } | |
357 | mutex_unlock(&dev->device_lock); | |
358 | rets = wait_event_interruptible(cl->tx_wait, | |
359 | cl->writing_state == MEI_WRITE_COMPLETE || | |
360 | (!mei_cl_is_connected(cl))); | |
361 | mutex_lock(&dev->device_lock); | |
362 | if (rets) { | |
363 | if (signal_pending(current)) | |
364 | rets = -EINTR; | |
365 | goto out; | |
366 | } | |
367 | if (!mei_cl_is_connected(cl)) { | |
368 | rets = -ENODEV; | |
369 | goto out; | |
370 | } | |
371 | } | |
372 | ||
6cbb097f AU |
373 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
374 | if (!cb) { | |
33d28c92 | 375 | rets = -ENOMEM; |
4234a6de | 376 | goto out; |
ab841160 | 377 | } |
f35fe5f4 | 378 | cb->vtag = mei_cl_vtag_by_fp(cl, file); |
ab841160 | 379 | |
6cbb097f | 380 | rets = copy_from_user(cb->buf.data, ubuf, length); |
d8b29efa | 381 | if (rets) { |
2bf94cab | 382 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 383 | rets = -EFAULT; |
6cbb097f | 384 | mei_io_cb_free(cb); |
4234a6de | 385 | goto out; |
d8b29efa | 386 | } |
ab841160 | 387 | |
e0cb6b2f | 388 | rets = mei_cl_write(cl, cb); |
b0d0cf77 | 389 | out: |
ab841160 | 390 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
391 | return rets; |
392 | } | |
393 | ||
9f81abda TW |
394 | /** |
395 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
396 | * | |
9f81abda | 397 | * @file: private data of the file object |
a8605ea2 | 398 | * @data: IOCTL connect data, input and output parameters |
9f81abda TW |
399 | * |
400 | * Locking: called under "dev->device_lock" lock | |
401 | * | |
a8605ea2 | 402 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
403 | */ |
404 | static int mei_ioctl_connect_client(struct file *file, | |
405 | struct mei_connect_client_data *data) | |
406 | { | |
407 | struct mei_device *dev; | |
408 | struct mei_client *client; | |
d320832f | 409 | struct mei_me_client *me_cl; |
9f81abda | 410 | struct mei_cl *cl; |
9f81abda TW |
411 | int rets; |
412 | ||
413 | cl = file->private_data; | |
9f81abda TW |
414 | dev = cl->dev; |
415 | ||
79563db9 TW |
416 | if (dev->dev_state != MEI_DEV_ENABLED) |
417 | return -ENODEV; | |
9f81abda TW |
418 | |
419 | if (cl->state != MEI_FILE_INITIALIZING && | |
79563db9 TW |
420 | cl->state != MEI_FILE_DISCONNECTED) |
421 | return -EBUSY; | |
9f81abda TW |
422 | |
423 | /* find ME client we're trying to connect to */ | |
d320832f | 424 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
f4e06246 | 425 | if (!me_cl) { |
2bf94cab | 426 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
d49ed64a | 427 | &data->in_client_uuid); |
f4e06246 AU |
428 | rets = -ENOTTY; |
429 | goto end; | |
430 | } | |
431 | ||
432 | if (me_cl->props.fixed_address) { | |
433 | bool forbidden = dev->override_fixed_address ? | |
434 | !dev->allow_fixed_address : !dev->hbm_f_fa_supported; | |
435 | if (forbidden) { | |
436 | dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n", | |
437 | &data->in_client_uuid); | |
438 | rets = -ENOTTY; | |
439 | goto end; | |
440 | } | |
9f81abda TW |
441 | } |
442 | ||
2bf94cab | 443 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
d49ed64a | 444 | me_cl->client_id); |
2bf94cab | 445 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 446 | me_cl->props.protocol_version); |
2bf94cab | 447 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 448 | me_cl->props.max_msg_length); |
9f81abda | 449 | |
9f81abda TW |
450 | /* prepare the output buffer */ |
451 | client = &data->out_client_properties; | |
d320832f TW |
452 | client->max_msg_length = me_cl->props.max_msg_length; |
453 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 454 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 455 | |
d49ed64a | 456 | rets = mei_cl_connect(cl, me_cl, file); |
9f81abda TW |
457 | |
458 | end: | |
79563db9 | 459 | mei_me_cl_put(me_cl); |
9f81abda TW |
460 | return rets; |
461 | } | |
462 | ||
3c7c8468 TW |
463 | /** |
464 | * mei_ioctl_client_notify_request - | |
465 | * propagate event notification request to client | |
466 | * | |
467 | * @file: pointer to file structure | |
468 | * @request: 0 - disable, 1 - enable | |
469 | * | |
470 | * Return: 0 on success , <0 on error | |
471 | */ | |
f23e2cc4 | 472 | static int mei_ioctl_client_notify_request(const struct file *file, u32 request) |
3c7c8468 TW |
473 | { |
474 | struct mei_cl *cl = file->private_data; | |
475 | ||
7326fffb AU |
476 | if (request != MEI_HBM_NOTIFICATION_START && |
477 | request != MEI_HBM_NOTIFICATION_STOP) | |
478 | return -EINVAL; | |
479 | ||
480 | return mei_cl_notify_request(cl, file, (u8)request); | |
3c7c8468 TW |
481 | } |
482 | ||
483 | /** | |
484 | * mei_ioctl_client_notify_get - wait for notification request | |
485 | * | |
486 | * @file: pointer to file structure | |
487 | * @notify_get: 0 - disable, 1 - enable | |
488 | * | |
489 | * Return: 0 on success , <0 on error | |
490 | */ | |
f23e2cc4 | 491 | static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get) |
3c7c8468 TW |
492 | { |
493 | struct mei_cl *cl = file->private_data; | |
494 | bool notify_ev; | |
495 | bool block = (file->f_flags & O_NONBLOCK) == 0; | |
496 | int rets; | |
497 | ||
498 | rets = mei_cl_notify_get(cl, block, ¬ify_ev); | |
499 | if (rets) | |
500 | return rets; | |
501 | ||
502 | *notify_get = notify_ev ? 1 : 0; | |
503 | return 0; | |
504 | } | |
505 | ||
ab841160 OW |
506 | /** |
507 | * mei_ioctl - the IOCTL function | |
508 | * | |
509 | * @file: pointer to file structure | |
510 | * @cmd: ioctl command | |
511 | * @data: pointer to mei message structure | |
512 | * | |
a8605ea2 | 513 | * Return: 0 on success , <0 on error |
ab841160 OW |
514 | */ |
515 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
516 | { | |
517 | struct mei_device *dev; | |
518 | struct mei_cl *cl = file->private_data; | |
154eb18f | 519 | struct mei_connect_client_data connect_data; |
3c7c8468 | 520 | u32 notify_get, notify_req; |
ab841160 OW |
521 | int rets; |
522 | ||
ab841160 OW |
523 | |
524 | if (WARN_ON(!cl || !cl->dev)) | |
525 | return -ENODEV; | |
526 | ||
527 | dev = cl->dev; | |
528 | ||
2bf94cab | 529 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
530 | |
531 | mutex_lock(&dev->device_lock); | |
b210d750 | 532 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
533 | rets = -ENODEV; |
534 | goto out; | |
535 | } | |
536 | ||
4f046e7b TW |
537 | switch (cmd) { |
538 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 539 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
154eb18f | 540 | if (copy_from_user(&connect_data, (char __user *)data, |
b4a6700c | 541 | sizeof(connect_data))) { |
2bf94cab | 542 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
543 | rets = -EFAULT; |
544 | goto out; | |
545 | } | |
ab841160 | 546 | |
154eb18f | 547 | rets = mei_ioctl_connect_client(file, &connect_data); |
4f046e7b TW |
548 | if (rets) |
549 | goto out; | |
ab841160 | 550 | |
4f046e7b | 551 | /* if all is ok, copying the data back to user. */ |
154eb18f | 552 | if (copy_to_user((char __user *)data, &connect_data, |
b4a6700c | 553 | sizeof(connect_data))) { |
2bf94cab | 554 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
555 | rets = -EFAULT; |
556 | goto out; | |
557 | } | |
558 | ||
559 | break; | |
154eb18f | 560 | |
3c7c8468 TW |
561 | case IOCTL_MEI_NOTIFY_SET: |
562 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); | |
563 | if (copy_from_user(¬ify_req, | |
564 | (char __user *)data, sizeof(notify_req))) { | |
565 | dev_dbg(dev->dev, "failed to copy data from userland\n"); | |
566 | rets = -EFAULT; | |
567 | goto out; | |
568 | } | |
569 | rets = mei_ioctl_client_notify_request(file, notify_req); | |
570 | break; | |
571 | ||
572 | case IOCTL_MEI_NOTIFY_GET: | |
573 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); | |
574 | rets = mei_ioctl_client_notify_get(file, ¬ify_get); | |
575 | if (rets) | |
576 | goto out; | |
577 | ||
578 | dev_dbg(dev->dev, "copy connect data to user\n"); | |
579 | if (copy_to_user((char __user *)data, | |
580 | ¬ify_get, sizeof(notify_get))) { | |
581 | dev_dbg(dev->dev, "failed to copy data to userland\n"); | |
582 | rets = -EFAULT; | |
583 | goto out; | |
584 | ||
585 | } | |
586 | break; | |
587 | ||
4f046e7b | 588 | default: |
4f046e7b | 589 | rets = -ENOIOCTLCMD; |
ab841160 OW |
590 | } |
591 | ||
592 | out: | |
ab841160 OW |
593 | mutex_unlock(&dev->device_lock); |
594 | return rets; | |
595 | } | |
596 | ||
ab841160 OW |
597 | /** |
598 | * mei_poll - the poll function | |
599 | * | |
600 | * @file: pointer to file structure | |
601 | * @wait: pointer to poll_table structure | |
602 | * | |
a8605ea2 | 603 | * Return: poll mask |
ab841160 | 604 | */ |
afc9a42b | 605 | static __poll_t mei_poll(struct file *file, poll_table *wait) |
ab841160 | 606 | { |
01699437 | 607 | __poll_t req_events = poll_requested_events(wait); |
ab841160 OW |
608 | struct mei_cl *cl = file->private_data; |
609 | struct mei_device *dev; | |
afc9a42b | 610 | __poll_t mask = 0; |
2c84c297 | 611 | bool notify_en; |
ab841160 OW |
612 | |
613 | if (WARN_ON(!cl || !cl->dev)) | |
a9a08845 | 614 | return EPOLLERR; |
ab841160 OW |
615 | |
616 | dev = cl->dev; | |
617 | ||
618 | mutex_lock(&dev->device_lock); | |
619 | ||
a9a08845 | 620 | notify_en = cl->notify_en && (req_events & EPOLLPRI); |
f3de9b63 TW |
621 | |
622 | if (dev->dev_state != MEI_DEV_ENABLED || | |
623 | !mei_cl_is_connected(cl)) { | |
a9a08845 | 624 | mask = EPOLLERR; |
ab841160 OW |
625 | goto out; |
626 | } | |
627 | ||
2c84c297 TW |
628 | if (notify_en) { |
629 | poll_wait(file, &cl->ev_wait, wait); | |
630 | if (cl->notify_ev) | |
a9a08845 | 631 | mask |= EPOLLPRI; |
2c84c297 | 632 | } |
9fa0be8b | 633 | |
a9a08845 | 634 | if (req_events & (EPOLLIN | EPOLLRDNORM)) { |
1d9013f0 TW |
635 | poll_wait(file, &cl->rx_wait, wait); |
636 | ||
d1376f3d | 637 | if (mei_cl_read_cb(cl, file)) |
a9a08845 | 638 | mask |= EPOLLIN | EPOLLRDNORM; |
1d9013f0 | 639 | else |
3030dc05 | 640 | mei_cl_read_start(cl, mei_cl_mtu(cl), file); |
1d9013f0 | 641 | } |
ab841160 | 642 | |
03b2cbb6 | 643 | if (req_events & (EPOLLOUT | EPOLLWRNORM)) { |
af336cab AU |
644 | poll_wait(file, &cl->tx_wait, wait); |
645 | if (cl->tx_cb_queued < dev->tx_queue_limit) | |
03b2cbb6 | 646 | mask |= EPOLLOUT | EPOLLWRNORM; |
af336cab AU |
647 | } |
648 | ||
ab841160 OW |
649 | out: |
650 | mutex_unlock(&dev->device_lock); | |
651 | return mask; | |
652 | } | |
653 | ||
58cde1a6 AU |
654 | /** |
655 | * mei_cl_is_write_queued - check if the client has pending writes. | |
656 | * | |
657 | * @cl: writing host client | |
658 | * | |
659 | * Return: true if client is writing, false otherwise. | |
660 | */ | |
661 | static bool mei_cl_is_write_queued(struct mei_cl *cl) | |
662 | { | |
663 | struct mei_device *dev = cl->dev; | |
664 | struct mei_cl_cb *cb; | |
665 | ||
666 | list_for_each_entry(cb, &dev->write_list, list) | |
667 | if (cb->cl == cl) | |
668 | return true; | |
669 | list_for_each_entry(cb, &dev->write_waiting_list, list) | |
670 | if (cb->cl == cl) | |
671 | return true; | |
672 | return false; | |
673 | } | |
674 | ||
675 | /** | |
676 | * mei_fsync - the fsync handler | |
677 | * | |
678 | * @fp: pointer to file structure | |
679 | * @start: unused | |
680 | * @end: unused | |
681 | * @datasync: unused | |
682 | * | |
683 | * Return: 0 on success, -ENODEV if client is not connected | |
684 | */ | |
685 | static int mei_fsync(struct file *fp, loff_t start, loff_t end, int datasync) | |
686 | { | |
687 | struct mei_cl *cl = fp->private_data; | |
688 | struct mei_device *dev; | |
689 | int rets; | |
690 | ||
691 | if (WARN_ON(!cl || !cl->dev)) | |
692 | return -ENODEV; | |
693 | ||
694 | dev = cl->dev; | |
695 | ||
696 | mutex_lock(&dev->device_lock); | |
697 | ||
698 | if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) { | |
699 | rets = -ENODEV; | |
700 | goto out; | |
701 | } | |
702 | ||
703 | while (mei_cl_is_write_queued(cl)) { | |
704 | mutex_unlock(&dev->device_lock); | |
705 | rets = wait_event_interruptible(cl->tx_wait, | |
706 | cl->writing_state == MEI_WRITE_COMPLETE || | |
707 | !mei_cl_is_connected(cl)); | |
708 | mutex_lock(&dev->device_lock); | |
709 | if (rets) { | |
710 | if (signal_pending(current)) | |
711 | rets = -EINTR; | |
712 | goto out; | |
713 | } | |
714 | if (!mei_cl_is_connected(cl)) { | |
715 | rets = -ENODEV; | |
716 | goto out; | |
717 | } | |
718 | } | |
719 | rets = 0; | |
720 | out: | |
721 | mutex_unlock(&dev->device_lock); | |
722 | return rets; | |
723 | } | |
724 | ||
237092bf TW |
725 | /** |
726 | * mei_fasync - asynchronous io support | |
727 | * | |
728 | * @fd: file descriptor | |
729 | * @file: pointer to file structure | |
730 | * @band: band bitmap | |
731 | * | |
ed6dc538 TW |
732 | * Return: negative on error, |
733 | * 0 if it did no changes, | |
734 | * and positive a process was added or deleted | |
237092bf TW |
735 | */ |
736 | static int mei_fasync(int fd, struct file *file, int band) | |
737 | { | |
738 | ||
739 | struct mei_cl *cl = file->private_data; | |
740 | ||
741 | if (!mei_cl_is_connected(cl)) | |
ed6dc538 | 742 | return -ENODEV; |
237092bf TW |
743 | |
744 | return fasync_helper(fd, file, band, &cl->ev_async); | |
745 | } | |
746 | ||
52f6efdf AU |
747 | /** |
748 | * trc_show - mei device trc attribute show method | |
749 | * | |
750 | * @device: device pointer | |
751 | * @attr: attribute pointer | |
752 | * @buf: char out buffer | |
753 | * | |
754 | * Return: number of the bytes printed into buf or error | |
755 | */ | |
756 | static ssize_t trc_show(struct device *device, | |
757 | struct device_attribute *attr, char *buf) | |
758 | { | |
759 | struct mei_device *dev = dev_get_drvdata(device); | |
760 | u32 trc; | |
761 | int ret; | |
762 | ||
763 | ret = mei_trc_status(dev, &trc); | |
764 | if (ret) | |
765 | return ret; | |
766 | return sprintf(buf, "%08X\n", trc); | |
767 | } | |
768 | static DEVICE_ATTR_RO(trc); | |
769 | ||
55c4e640 | 770 | /** |
88d1bece | 771 | * fw_status_show - mei device fw_status attribute show method |
55c4e640 TW |
772 | * |
773 | * @device: device pointer | |
774 | * @attr: attribute pointer | |
775 | * @buf: char out buffer | |
776 | * | |
777 | * Return: number of the bytes printed into buf or error | |
778 | */ | |
779 | static ssize_t fw_status_show(struct device *device, | |
780 | struct device_attribute *attr, char *buf) | |
781 | { | |
782 | struct mei_device *dev = dev_get_drvdata(device); | |
783 | struct mei_fw_status fw_status; | |
784 | int err, i; | |
785 | ssize_t cnt = 0; | |
786 | ||
787 | mutex_lock(&dev->device_lock); | |
788 | err = mei_fw_status(dev, &fw_status); | |
789 | mutex_unlock(&dev->device_lock); | |
790 | if (err) { | |
791 | dev_err(device, "read fw_status error = %d\n", err); | |
792 | return err; | |
793 | } | |
794 | ||
795 | for (i = 0; i < fw_status.count; i++) | |
796 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
797 | fw_status.status[i]); | |
798 | return cnt; | |
799 | } | |
800 | static DEVICE_ATTR_RO(fw_status); | |
801 | ||
88d1bece AU |
802 | /** |
803 | * hbm_ver_show - display HBM protocol version negotiated with FW | |
804 | * | |
805 | * @device: device pointer | |
806 | * @attr: attribute pointer | |
807 | * @buf: char out buffer | |
808 | * | |
809 | * Return: number of the bytes printed into buf or error | |
810 | */ | |
811 | static ssize_t hbm_ver_show(struct device *device, | |
812 | struct device_attribute *attr, char *buf) | |
813 | { | |
814 | struct mei_device *dev = dev_get_drvdata(device); | |
815 | struct hbm_version ver; | |
816 | ||
817 | mutex_lock(&dev->device_lock); | |
818 | ver = dev->version; | |
819 | mutex_unlock(&dev->device_lock); | |
820 | ||
821 | return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version); | |
822 | } | |
823 | static DEVICE_ATTR_RO(hbm_ver); | |
824 | ||
825 | /** | |
826 | * hbm_ver_drv_show - display HBM protocol version advertised by driver | |
827 | * | |
828 | * @device: device pointer | |
829 | * @attr: attribute pointer | |
830 | * @buf: char out buffer | |
831 | * | |
832 | * Return: number of the bytes printed into buf or error | |
833 | */ | |
834 | static ssize_t hbm_ver_drv_show(struct device *device, | |
835 | struct device_attribute *attr, char *buf) | |
836 | { | |
837 | return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION); | |
838 | } | |
839 | static DEVICE_ATTR_RO(hbm_ver_drv); | |
840 | ||
af336cab AU |
841 | static ssize_t tx_queue_limit_show(struct device *device, |
842 | struct device_attribute *attr, char *buf) | |
843 | { | |
844 | struct mei_device *dev = dev_get_drvdata(device); | |
845 | u8 size = 0; | |
846 | ||
847 | mutex_lock(&dev->device_lock); | |
848 | size = dev->tx_queue_limit; | |
849 | mutex_unlock(&dev->device_lock); | |
850 | ||
851 | return snprintf(buf, PAGE_SIZE, "%u\n", size); | |
852 | } | |
853 | ||
854 | static ssize_t tx_queue_limit_store(struct device *device, | |
855 | struct device_attribute *attr, | |
856 | const char *buf, size_t count) | |
857 | { | |
858 | struct mei_device *dev = dev_get_drvdata(device); | |
859 | u8 limit; | |
860 | unsigned int inp; | |
861 | int err; | |
862 | ||
863 | err = kstrtouint(buf, 10, &inp); | |
864 | if (err) | |
865 | return err; | |
866 | if (inp > MEI_TX_QUEUE_LIMIT_MAX || inp < MEI_TX_QUEUE_LIMIT_MIN) | |
867 | return -EINVAL; | |
868 | limit = inp; | |
869 | ||
870 | mutex_lock(&dev->device_lock); | |
871 | dev->tx_queue_limit = limit; | |
872 | mutex_unlock(&dev->device_lock); | |
873 | ||
874 | return count; | |
875 | } | |
876 | static DEVICE_ATTR_RW(tx_queue_limit); | |
877 | ||
3cfaeb33 AU |
878 | /** |
879 | * fw_ver_show - display ME FW version | |
880 | * | |
881 | * @device: device pointer | |
882 | * @attr: attribute pointer | |
883 | * @buf: char out buffer | |
884 | * | |
885 | * Return: number of the bytes printed into buf or error | |
886 | */ | |
887 | static ssize_t fw_ver_show(struct device *device, | |
888 | struct device_attribute *attr, char *buf) | |
889 | { | |
890 | struct mei_device *dev = dev_get_drvdata(device); | |
891 | struct mei_fw_version *ver; | |
892 | ssize_t cnt = 0; | |
893 | int i; | |
894 | ||
895 | ver = dev->fw_ver; | |
896 | ||
897 | for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) | |
898 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%u:%u.%u.%u.%u\n", | |
899 | ver[i].platform, ver[i].major, ver[i].minor, | |
900 | ver[i].hotfix, ver[i].buildno); | |
901 | return cnt; | |
902 | } | |
903 | static DEVICE_ATTR_RO(fw_ver); | |
904 | ||
43b8a7ed AU |
905 | /** |
906 | * dev_state_show - display device state | |
907 | * | |
908 | * @device: device pointer | |
909 | * @attr: attribute pointer | |
910 | * @buf: char out buffer | |
911 | * | |
912 | * Return: number of the bytes printed into buf or error | |
913 | */ | |
914 | static ssize_t dev_state_show(struct device *device, | |
915 | struct device_attribute *attr, char *buf) | |
916 | { | |
917 | struct mei_device *dev = dev_get_drvdata(device); | |
918 | enum mei_dev_state dev_state; | |
919 | ||
920 | mutex_lock(&dev->device_lock); | |
921 | dev_state = dev->dev_state; | |
922 | mutex_unlock(&dev->device_lock); | |
923 | ||
924 | return sprintf(buf, "%s", mei_dev_state_str(dev_state)); | |
925 | } | |
926 | static DEVICE_ATTR_RO(dev_state); | |
927 | ||
43b8a7ed AU |
928 | /** |
929 | * dev_set_devstate: set to new device state and notify sysfs file. | |
930 | * | |
931 | * @dev: mei_device | |
932 | * @state: new device state | |
933 | */ | |
934 | void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state) | |
935 | { | |
936 | struct device *clsdev; | |
937 | ||
938 | if (dev->dev_state == state) | |
939 | return; | |
940 | ||
941 | dev->dev_state = state; | |
942 | ||
4495dfdd | 943 | clsdev = class_find_device_by_devt(mei_class, dev->cdev.dev); |
43b8a7ed AU |
944 | if (clsdev) { |
945 | sysfs_notify(&clsdev->kobj, NULL, "dev_state"); | |
946 | put_device(clsdev); | |
947 | } | |
948 | } | |
949 | ||
2f79d3d1 AU |
950 | /** |
951 | * kind_show - display device kind | |
952 | * | |
953 | * @device: device pointer | |
954 | * @attr: attribute pointer | |
955 | * @buf: char out buffer | |
956 | * | |
957 | * Return: number of the bytes printed into buf or error | |
958 | */ | |
959 | static ssize_t kind_show(struct device *device, | |
960 | struct device_attribute *attr, char *buf) | |
961 | { | |
962 | struct mei_device *dev = dev_get_drvdata(device); | |
963 | ssize_t ret; | |
964 | ||
965 | if (dev->kind) | |
966 | ret = sprintf(buf, "%s\n", dev->kind); | |
967 | else | |
968 | ret = sprintf(buf, "%s\n", "mei"); | |
969 | ||
970 | return ret; | |
971 | } | |
972 | static DEVICE_ATTR_RO(kind); | |
973 | ||
55c4e640 TW |
974 | static struct attribute *mei_attrs[] = { |
975 | &dev_attr_fw_status.attr, | |
88d1bece AU |
976 | &dev_attr_hbm_ver.attr, |
977 | &dev_attr_hbm_ver_drv.attr, | |
af336cab | 978 | &dev_attr_tx_queue_limit.attr, |
3cfaeb33 | 979 | &dev_attr_fw_ver.attr, |
43b8a7ed | 980 | &dev_attr_dev_state.attr, |
52f6efdf | 981 | &dev_attr_trc.attr, |
2f79d3d1 | 982 | &dev_attr_kind.attr, |
55c4e640 TW |
983 | NULL |
984 | }; | |
985 | ATTRIBUTE_GROUPS(mei); | |
986 | ||
5b881e3c OW |
987 | /* |
988 | * file operations structure will be used for mei char device. | |
989 | */ | |
990 | static const struct file_operations mei_fops = { | |
991 | .owner = THIS_MODULE, | |
992 | .read = mei_read, | |
993 | .unlocked_ioctl = mei_ioctl, | |
407e9ef7 | 994 | .compat_ioctl = compat_ptr_ioctl, |
5b881e3c OW |
995 | .open = mei_open, |
996 | .release = mei_release, | |
997 | .write = mei_write, | |
998 | .poll = mei_poll, | |
58cde1a6 | 999 | .fsync = mei_fsync, |
237092bf | 1000 | .fasync = mei_fasync, |
5b881e3c OW |
1001 | .llseek = no_llseek |
1002 | }; | |
1003 | ||
f3d8e878 AU |
1004 | /** |
1005 | * mei_minor_get - obtain next free device minor number | |
1006 | * | |
1007 | * @dev: device pointer | |
1008 | * | |
a8605ea2 | 1009 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 1010 | */ |
f3d8e878 AU |
1011 | static int mei_minor_get(struct mei_device *dev) |
1012 | { | |
1013 | int ret; | |
1014 | ||
1015 | mutex_lock(&mei_minor_lock); | |
1016 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
1017 | if (ret >= 0) | |
1018 | dev->minor = ret; | |
1019 | else if (ret == -ENOSPC) | |
2bf94cab | 1020 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 1021 | |
f3d8e878 AU |
1022 | mutex_unlock(&mei_minor_lock); |
1023 | return ret; | |
1024 | } | |
30e53bb8 | 1025 | |
f3d8e878 AU |
1026 | /** |
1027 | * mei_minor_free - mark device minor number as free | |
1028 | * | |
1029 | * @dev: device pointer | |
1030 | */ | |
1031 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 1032 | { |
f3d8e878 AU |
1033 | mutex_lock(&mei_minor_lock); |
1034 | idr_remove(&mei_idr, dev->minor); | |
1035 | mutex_unlock(&mei_minor_lock); | |
1036 | } | |
1037 | ||
1038 | int mei_register(struct mei_device *dev, struct device *parent) | |
1039 | { | |
1040 | struct device *clsdev; /* class device */ | |
1041 | int ret, devno; | |
1042 | ||
1043 | ret = mei_minor_get(dev); | |
1044 | if (ret < 0) | |
30e53bb8 TW |
1045 | return ret; |
1046 | ||
f3d8e878 AU |
1047 | /* Fill in the data structures */ |
1048 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
1049 | cdev_init(&dev->cdev, &mei_fops); | |
154322f4 | 1050 | dev->cdev.owner = parent->driver->owner; |
f3d8e878 AU |
1051 | |
1052 | /* Add the device */ | |
1053 | ret = cdev_add(&dev->cdev, devno, 1); | |
1054 | if (ret) { | |
1055 | dev_err(parent, "unable to add device %d:%d\n", | |
1056 | MAJOR(mei_devt), dev->minor); | |
1057 | goto err_dev_add; | |
1058 | } | |
1059 | ||
55c4e640 TW |
1060 | clsdev = device_create_with_groups(mei_class, parent, devno, |
1061 | dev, mei_groups, | |
1062 | "mei%d", dev->minor); | |
f3d8e878 AU |
1063 | |
1064 | if (IS_ERR(clsdev)) { | |
1065 | dev_err(parent, "unable to create device %d:%d\n", | |
1066 | MAJOR(mei_devt), dev->minor); | |
1067 | ret = PTR_ERR(clsdev); | |
1068 | goto err_dev_create; | |
1069 | } | |
1070 | ||
5666d896 | 1071 | mei_dbgfs_register(dev, dev_name(clsdev)); |
30e53bb8 TW |
1072 | |
1073 | return 0; | |
f3d8e878 | 1074 | |
f3d8e878 AU |
1075 | err_dev_create: |
1076 | cdev_del(&dev->cdev); | |
1077 | err_dev_add: | |
1078 | mei_minor_free(dev); | |
1079 | return ret; | |
5b881e3c | 1080 | } |
40e0b67b | 1081 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 1082 | |
30e53bb8 | 1083 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 1084 | { |
f3d8e878 AU |
1085 | int devno; |
1086 | ||
1087 | devno = dev->cdev.dev; | |
1088 | cdev_del(&dev->cdev); | |
1089 | ||
30e53bb8 | 1090 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
1091 | |
1092 | device_destroy(mei_class, devno); | |
1093 | ||
1094 | mei_minor_free(dev); | |
5b881e3c | 1095 | } |
40e0b67b | 1096 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 1097 | |
cf3baefb SO |
1098 | static int __init mei_init(void) |
1099 | { | |
f3d8e878 AU |
1100 | int ret; |
1101 | ||
1102 | mei_class = class_create(THIS_MODULE, "mei"); | |
1103 | if (IS_ERR(mei_class)) { | |
1104 | pr_err("couldn't create class\n"); | |
1105 | ret = PTR_ERR(mei_class); | |
1106 | goto err; | |
1107 | } | |
1108 | ||
1109 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
1110 | if (ret < 0) { | |
1111 | pr_err("unable to allocate char dev region\n"); | |
1112 | goto err_class; | |
1113 | } | |
1114 | ||
1115 | ret = mei_cl_bus_init(); | |
1116 | if (ret < 0) { | |
1117 | pr_err("unable to initialize bus\n"); | |
1118 | goto err_chrdev; | |
1119 | } | |
1120 | ||
1121 | return 0; | |
1122 | ||
1123 | err_chrdev: | |
1124 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
1125 | err_class: | |
1126 | class_destroy(mei_class); | |
1127 | err: | |
1128 | return ret; | |
cf3baefb SO |
1129 | } |
1130 | ||
1131 | static void __exit mei_exit(void) | |
1132 | { | |
f3d8e878 AU |
1133 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
1134 | class_destroy(mei_class); | |
cf3baefb SO |
1135 | mei_cl_bus_exit(); |
1136 | } | |
1137 | ||
1138 | module_init(mei_init); | |
1139 | module_exit(mei_exit); | |
1140 | ||
40e0b67b TW |
1141 | MODULE_AUTHOR("Intel Corporation"); |
1142 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 1143 | MODULE_LICENSE("GPL v2"); |
ab841160 | 1144 |