]>
Commit | Line | Data |
---|---|---|
ab841160 OW |
1 | /* |
2 | * | |
3 | * Intel Management Engine Interface (Intel MEI) Linux driver | |
733ba91c | 4 | * Copyright (c) 2003-2012, Intel Corporation. |
ab841160 OW |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | */ | |
ab841160 OW |
16 | #include <linux/module.h> |
17 | #include <linux/moduleparam.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/device.h> | |
1f180359 | 20 | #include <linux/slab.h> |
ab841160 OW |
21 | #include <linux/fs.h> |
22 | #include <linux/errno.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/fcntl.h> | |
ab841160 OW |
25 | #include <linux/poll.h> |
26 | #include <linux/init.h> | |
27 | #include <linux/ioctl.h> | |
28 | #include <linux/cdev.h> | |
ab841160 OW |
29 | #include <linux/sched.h> |
30 | #include <linux/uuid.h> | |
31 | #include <linux/compat.h> | |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/interrupt.h> | |
34 | ||
4f3afe1d | 35 | #include <linux/mei.h> |
47a73801 TW |
36 | |
37 | #include "mei_dev.h" | |
90e0b5f1 | 38 | #include "client.h" |
ab841160 | 39 | |
ab841160 OW |
40 | /** |
41 | * mei_open - the open function | |
42 | * | |
43 | * @inode: pointer to inode structure | |
44 | * @file: pointer to file structure | |
83ce0741 | 45 | * |
a8605ea2 | 46 | * Return: 0 on success, <0 on error |
ab841160 OW |
47 | */ |
48 | static int mei_open(struct inode *inode, struct file *file) | |
49 | { | |
ab841160 | 50 | struct mei_device *dev; |
f3d8e878 | 51 | struct mei_cl *cl; |
2703d4b2 | 52 | |
6f37aca8 | 53 | int err; |
ab841160 | 54 | |
f3d8e878 | 55 | dev = container_of(inode->i_cdev, struct mei_device, cdev); |
5b881e3c | 56 | if (!dev) |
e036cc57 | 57 | return -ENODEV; |
ab841160 OW |
58 | |
59 | mutex_lock(&dev->device_lock); | |
e036cc57 | 60 | |
b210d750 | 61 | if (dev->dev_state != MEI_DEV_ENABLED) { |
2bf94cab | 62 | dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n", |
b210d750 | 63 | mei_dev_state_str(dev->dev_state)); |
03b8d341 | 64 | err = -ENODEV; |
e036cc57 | 65 | goto err_unlock; |
1b812947 | 66 | } |
ab841160 | 67 | |
03b8d341 TW |
68 | cl = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY); |
69 | if (IS_ERR(cl)) { | |
70 | err = PTR_ERR(cl); | |
e036cc57 | 71 | goto err_unlock; |
03b8d341 | 72 | } |
ab841160 OW |
73 | |
74 | file->private_data = cl; | |
e036cc57 | 75 | |
ab841160 OW |
76 | mutex_unlock(&dev->device_lock); |
77 | ||
5b881e3c | 78 | return nonseekable_open(inode, file); |
ab841160 | 79 | |
e036cc57 | 80 | err_unlock: |
ab841160 | 81 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
82 | return err; |
83 | } | |
84 | ||
85 | /** | |
86 | * mei_release - the release function | |
87 | * | |
88 | * @inode: pointer to inode structure | |
89 | * @file: pointer to file structure | |
90 | * | |
a8605ea2 | 91 | * Return: 0 on success, <0 on error |
ab841160 OW |
92 | */ |
93 | static int mei_release(struct inode *inode, struct file *file) | |
94 | { | |
95 | struct mei_cl *cl = file->private_data; | |
ab841160 | 96 | struct mei_device *dev; |
3c666182 | 97 | int rets; |
ab841160 OW |
98 | |
99 | if (WARN_ON(!cl || !cl->dev)) | |
100 | return -ENODEV; | |
101 | ||
102 | dev = cl->dev; | |
103 | ||
104 | mutex_lock(&dev->device_lock); | |
a562d5c2 TW |
105 | if (cl == &dev->iamthif_cl) { |
106 | rets = mei_amthif_release(dev, file); | |
107 | goto out; | |
108 | } | |
3c666182 TW |
109 | rets = mei_cl_disconnect(cl); |
110 | ||
a9bed610 | 111 | mei_cl_flush_queues(cl, file); |
46922186 | 112 | cl_dbg(dev, cl, "removing\n"); |
a562d5c2 | 113 | |
90e0b5f1 | 114 | mei_cl_unlink(cl); |
a562d5c2 | 115 | |
a562d5c2 | 116 | file->private_data = NULL; |
ab841160 | 117 | |
a562d5c2 TW |
118 | kfree(cl); |
119 | out: | |
ab841160 OW |
120 | mutex_unlock(&dev->device_lock); |
121 | return rets; | |
122 | } | |
123 | ||
124 | ||
125 | /** | |
126 | * mei_read - the read function. | |
127 | * | |
128 | * @file: pointer to file structure | |
129 | * @ubuf: pointer to user buffer | |
130 | * @length: buffer length | |
131 | * @offset: data offset in buffer | |
132 | * | |
a8605ea2 | 133 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
134 | */ |
135 | static ssize_t mei_read(struct file *file, char __user *ubuf, | |
441ab50f | 136 | size_t length, loff_t *offset) |
ab841160 OW |
137 | { |
138 | struct mei_cl *cl = file->private_data; | |
ab841160 | 139 | struct mei_device *dev; |
a9bed610 | 140 | struct mei_cl_cb *cb = NULL; |
ab841160 OW |
141 | int rets; |
142 | int err; | |
143 | ||
144 | ||
145 | if (WARN_ON(!cl || !cl->dev)) | |
146 | return -ENODEV; | |
147 | ||
148 | dev = cl->dev; | |
149 | ||
dd5de1f1 | 150 | |
ab841160 | 151 | mutex_lock(&dev->device_lock); |
b210d750 | 152 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
153 | rets = -ENODEV; |
154 | goto out; | |
155 | } | |
156 | ||
dd5de1f1 TW |
157 | if (length == 0) { |
158 | rets = 0; | |
159 | goto out; | |
160 | } | |
161 | ||
8b2458f4 AU |
162 | if (ubuf == NULL) { |
163 | rets = -EMSGSIZE; | |
164 | goto out; | |
165 | } | |
166 | ||
ab841160 | 167 | if (cl == &dev->iamthif_cl) { |
19838fb8 | 168 | rets = mei_amthif_read(dev, file, ubuf, length, offset); |
ab841160 OW |
169 | goto out; |
170 | } | |
171 | ||
a9bed610 | 172 | cb = mei_cl_read_cb(cl, file); |
8b2458f4 AU |
173 | if (cb) |
174 | goto copy_buffer; | |
175 | ||
176 | if (*offset > 0) | |
ab841160 | 177 | *offset = 0; |
ab841160 | 178 | |
bca67d68 | 179 | err = mei_cl_read_start(cl, length, file); |
ab841160 | 180 | if (err && err != -EBUSY) { |
292f82c8 | 181 | cl_dbg(dev, cl, "mei start read failure status = %d\n", err); |
ab841160 OW |
182 | rets = err; |
183 | goto out; | |
184 | } | |
185 | ||
a9bed610 | 186 | if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) { |
ab841160 OW |
187 | if (file->f_flags & O_NONBLOCK) { |
188 | rets = -EAGAIN; | |
189 | goto out; | |
190 | } | |
191 | ||
192 | mutex_unlock(&dev->device_lock); | |
193 | ||
194 | if (wait_event_interruptible(cl->rx_wait, | |
a9bed610 | 195 | (!list_empty(&cl->rd_completed)) || |
6a84d63d | 196 | (!mei_cl_is_connected(cl)))) { |
e2b31644 | 197 | |
ab841160 OW |
198 | if (signal_pending(current)) |
199 | return -EINTR; | |
200 | return -ERESTARTSYS; | |
201 | } | |
202 | ||
203 | mutex_lock(&dev->device_lock); | |
6a84d63d | 204 | if (!mei_cl_is_connected(cl)) { |
ab841160 OW |
205 | rets = -EBUSY; |
206 | goto out; | |
207 | } | |
208 | } | |
209 | ||
a9bed610 | 210 | cb = mei_cl_read_cb(cl, file); |
ab841160 | 211 | if (!cb) { |
eeabfcf5 AU |
212 | if (mei_cl_is_fixed_address(cl) && dev->allow_fixed_address) { |
213 | cb = mei_cl_read_cb(cl, NULL); | |
214 | if (cb) | |
215 | goto copy_buffer; | |
216 | } | |
ab841160 OW |
217 | rets = 0; |
218 | goto out; | |
219 | } | |
3d33ff24 | 220 | |
ab841160 | 221 | copy_buffer: |
3d33ff24 TW |
222 | /* now copy the data to user space */ |
223 | if (cb->status) { | |
224 | rets = cb->status; | |
292f82c8 | 225 | cl_dbg(dev, cl, "read operation failed %d\n", rets); |
3d33ff24 TW |
226 | goto free; |
227 | } | |
228 | ||
8b2458f4 AU |
229 | cl_dbg(dev, cl, "buf.size = %d buf.idx = %ld offset = %lld\n", |
230 | cb->buf.size, cb->buf_idx, *offset); | |
231 | if (*offset >= cb->buf_idx) { | |
232 | rets = 0; | |
ab841160 OW |
233 | goto free; |
234 | } | |
235 | ||
ebb108ef TW |
236 | /* length is being truncated to PAGE_SIZE, |
237 | * however buf_idx may point beyond that */ | |
238 | length = min_t(size_t, length, cb->buf_idx - *offset); | |
ab841160 | 239 | |
5db7514d | 240 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
2bf94cab | 241 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
ab841160 OW |
242 | rets = -EFAULT; |
243 | goto free; | |
244 | } | |
245 | ||
246 | rets = length; | |
247 | *offset += length; | |
ebb108ef | 248 | if ((unsigned long)*offset < cb->buf_idx) |
ab841160 OW |
249 | goto out; |
250 | ||
251 | free: | |
601a1efa | 252 | mei_io_cb_free(cb); |
8b2458f4 | 253 | *offset = 0; |
928fa666 | 254 | |
ab841160 | 255 | out: |
292f82c8 | 256 | cl_dbg(dev, cl, "end mei read rets = %d\n", rets); |
ab841160 OW |
257 | mutex_unlock(&dev->device_lock); |
258 | return rets; | |
259 | } | |
ab841160 OW |
260 | /** |
261 | * mei_write - the write function. | |
262 | * | |
263 | * @file: pointer to file structure | |
264 | * @ubuf: pointer to user buffer | |
265 | * @length: buffer length | |
266 | * @offset: data offset in buffer | |
267 | * | |
a8605ea2 | 268 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
269 | */ |
270 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
441ab50f | 271 | size_t length, loff_t *offset) |
ab841160 OW |
272 | { |
273 | struct mei_cl *cl = file->private_data; | |
274 | struct mei_cl_cb *write_cb = NULL; | |
ab841160 OW |
275 | struct mei_device *dev; |
276 | unsigned long timeout = 0; | |
277 | int rets; | |
ab841160 OW |
278 | |
279 | if (WARN_ON(!cl || !cl->dev)) | |
280 | return -ENODEV; | |
281 | ||
282 | dev = cl->dev; | |
283 | ||
284 | mutex_lock(&dev->device_lock); | |
285 | ||
b210d750 | 286 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 287 | rets = -ENODEV; |
4234a6de | 288 | goto out; |
ab841160 OW |
289 | } |
290 | ||
d49ed64a AU |
291 | if (!mei_cl_is_connected(cl)) { |
292 | cl_err(dev, cl, "is not connected"); | |
293 | rets = -ENODEV; | |
4234a6de | 294 | goto out; |
75f0ee15 | 295 | } |
dd5de1f1 | 296 | |
d49ed64a AU |
297 | if (!mei_me_cl_is_active(cl->me_cl)) { |
298 | rets = -ENOTTY; | |
dd5de1f1 TW |
299 | goto out; |
300 | } | |
301 | ||
d49ed64a | 302 | if (length > mei_cl_mtu(cl)) { |
dd5de1f1 | 303 | rets = -EFBIG; |
4234a6de | 304 | goto out; |
75f0ee15 TW |
305 | } |
306 | ||
d49ed64a AU |
307 | if (length == 0) { |
308 | rets = 0; | |
4234a6de | 309 | goto out; |
75f0ee15 | 310 | } |
d49ed64a | 311 | |
ab841160 | 312 | if (cl == &dev->iamthif_cl) { |
19838fb8 | 313 | write_cb = mei_amthif_find_read_list_entry(dev, file); |
ab841160 OW |
314 | |
315 | if (write_cb) { | |
316 | timeout = write_cb->read_time + | |
3870c320 | 317 | mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER); |
ab841160 | 318 | |
a9bed610 | 319 | if (time_after(jiffies, timeout)) { |
75f0ee15 | 320 | *offset = 0; |
601a1efa | 321 | mei_io_cb_free(write_cb); |
75f0ee15 | 322 | write_cb = NULL; |
ab841160 OW |
323 | } |
324 | } | |
325 | } | |
326 | ||
a9bed610 | 327 | *offset = 0; |
bca67d68 | 328 | write_cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
ab841160 | 329 | if (!write_cb) { |
33d28c92 | 330 | rets = -ENOMEM; |
4234a6de | 331 | goto out; |
ab841160 | 332 | } |
ab841160 | 333 | |
5db7514d | 334 | rets = copy_from_user(write_cb->buf.data, ubuf, length); |
d8b29efa | 335 | if (rets) { |
2bf94cab | 336 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 337 | rets = -EFAULT; |
4234a6de | 338 | goto out; |
d8b29efa | 339 | } |
ab841160 | 340 | |
ab841160 | 341 | if (cl == &dev->iamthif_cl) { |
8660172e | 342 | rets = mei_amthif_write(cl, write_cb); |
ab841160 | 343 | |
ab5c4a56 | 344 | if (rets) { |
2bf94cab | 345 | dev_err(dev->dev, |
1a1aca42 | 346 | "amthif write failed with status = %d\n", rets); |
4234a6de | 347 | goto out; |
ab841160 OW |
348 | } |
349 | mutex_unlock(&dev->device_lock); | |
75f0ee15 | 350 | return length; |
ab841160 OW |
351 | } |
352 | ||
4234a6de | 353 | rets = mei_cl_write(cl, write_cb, false); |
b0d0cf77 | 354 | out: |
ab841160 | 355 | mutex_unlock(&dev->device_lock); |
4234a6de TW |
356 | if (rets < 0) |
357 | mei_io_cb_free(write_cb); | |
ab841160 OW |
358 | return rets; |
359 | } | |
360 | ||
9f81abda TW |
361 | /** |
362 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
363 | * | |
9f81abda | 364 | * @file: private data of the file object |
a8605ea2 | 365 | * @data: IOCTL connect data, input and output parameters |
9f81abda TW |
366 | * |
367 | * Locking: called under "dev->device_lock" lock | |
368 | * | |
a8605ea2 | 369 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
370 | */ |
371 | static int mei_ioctl_connect_client(struct file *file, | |
372 | struct mei_connect_client_data *data) | |
373 | { | |
374 | struct mei_device *dev; | |
375 | struct mei_client *client; | |
d320832f | 376 | struct mei_me_client *me_cl; |
9f81abda | 377 | struct mei_cl *cl; |
9f81abda TW |
378 | int rets; |
379 | ||
380 | cl = file->private_data; | |
9f81abda TW |
381 | dev = cl->dev; |
382 | ||
79563db9 TW |
383 | if (dev->dev_state != MEI_DEV_ENABLED) |
384 | return -ENODEV; | |
9f81abda TW |
385 | |
386 | if (cl->state != MEI_FILE_INITIALIZING && | |
79563db9 TW |
387 | cl->state != MEI_FILE_DISCONNECTED) |
388 | return -EBUSY; | |
9f81abda TW |
389 | |
390 | /* find ME client we're trying to connect to */ | |
d320832f | 391 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
eeabfcf5 AU |
392 | if (!me_cl || |
393 | (me_cl->props.fixed_address && !dev->allow_fixed_address)) { | |
2bf94cab | 394 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
d49ed64a AU |
395 | &data->in_client_uuid); |
396 | mei_me_cl_put(me_cl); | |
79563db9 | 397 | return -ENOTTY; |
9f81abda TW |
398 | } |
399 | ||
2bf94cab | 400 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
d49ed64a | 401 | me_cl->client_id); |
2bf94cab | 402 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 403 | me_cl->props.protocol_version); |
2bf94cab | 404 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 405 | me_cl->props.max_msg_length); |
9f81abda | 406 | |
1a1aca42 | 407 | /* if we're connecting to amthif client then we will use the |
9f81abda TW |
408 | * existing connection |
409 | */ | |
1a1aca42 | 410 | if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) { |
2bf94cab | 411 | dev_dbg(dev->dev, "FW Client is amthi\n"); |
f3de9b63 | 412 | if (!mei_cl_is_connected(&dev->iamthif_cl)) { |
9f81abda TW |
413 | rets = -ENODEV; |
414 | goto end; | |
415 | } | |
9f81abda TW |
416 | mei_cl_unlink(cl); |
417 | ||
418 | kfree(cl); | |
419 | cl = NULL; | |
22f96a0e | 420 | dev->iamthif_open_count++; |
9f81abda TW |
421 | file->private_data = &dev->iamthif_cl; |
422 | ||
423 | client = &data->out_client_properties; | |
d320832f TW |
424 | client->max_msg_length = me_cl->props.max_msg_length; |
425 | client->protocol_version = me_cl->props.protocol_version; | |
9f81abda TW |
426 | rets = dev->iamthif_cl.status; |
427 | ||
428 | goto end; | |
429 | } | |
430 | ||
9f81abda TW |
431 | /* prepare the output buffer */ |
432 | client = &data->out_client_properties; | |
d320832f TW |
433 | client->max_msg_length = me_cl->props.max_msg_length; |
434 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 435 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 436 | |
d49ed64a | 437 | rets = mei_cl_connect(cl, me_cl, file); |
9f81abda TW |
438 | |
439 | end: | |
79563db9 | 440 | mei_me_cl_put(me_cl); |
9f81abda TW |
441 | return rets; |
442 | } | |
443 | ||
3c7c8468 TW |
444 | /** |
445 | * mei_ioctl_client_notify_request - | |
446 | * propagate event notification request to client | |
447 | * | |
448 | * @file: pointer to file structure | |
449 | * @request: 0 - disable, 1 - enable | |
450 | * | |
451 | * Return: 0 on success , <0 on error | |
452 | */ | |
453 | static int mei_ioctl_client_notify_request(struct file *file, u32 request) | |
454 | { | |
455 | struct mei_cl *cl = file->private_data; | |
456 | ||
457 | return mei_cl_notify_request(cl, file, request); | |
458 | } | |
459 | ||
460 | /** | |
461 | * mei_ioctl_client_notify_get - wait for notification request | |
462 | * | |
463 | * @file: pointer to file structure | |
464 | * @notify_get: 0 - disable, 1 - enable | |
465 | * | |
466 | * Return: 0 on success , <0 on error | |
467 | */ | |
468 | static int mei_ioctl_client_notify_get(struct file *file, u32 *notify_get) | |
469 | { | |
470 | struct mei_cl *cl = file->private_data; | |
471 | bool notify_ev; | |
472 | bool block = (file->f_flags & O_NONBLOCK) == 0; | |
473 | int rets; | |
474 | ||
475 | rets = mei_cl_notify_get(cl, block, ¬ify_ev); | |
476 | if (rets) | |
477 | return rets; | |
478 | ||
479 | *notify_get = notify_ev ? 1 : 0; | |
480 | return 0; | |
481 | } | |
482 | ||
ab841160 OW |
483 | /** |
484 | * mei_ioctl - the IOCTL function | |
485 | * | |
486 | * @file: pointer to file structure | |
487 | * @cmd: ioctl command | |
488 | * @data: pointer to mei message structure | |
489 | * | |
a8605ea2 | 490 | * Return: 0 on success , <0 on error |
ab841160 OW |
491 | */ |
492 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
493 | { | |
494 | struct mei_device *dev; | |
495 | struct mei_cl *cl = file->private_data; | |
154eb18f | 496 | struct mei_connect_client_data connect_data; |
3c7c8468 | 497 | u32 notify_get, notify_req; |
ab841160 OW |
498 | int rets; |
499 | ||
ab841160 OW |
500 | |
501 | if (WARN_ON(!cl || !cl->dev)) | |
502 | return -ENODEV; | |
503 | ||
504 | dev = cl->dev; | |
505 | ||
2bf94cab | 506 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
507 | |
508 | mutex_lock(&dev->device_lock); | |
b210d750 | 509 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
510 | rets = -ENODEV; |
511 | goto out; | |
512 | } | |
513 | ||
4f046e7b TW |
514 | switch (cmd) { |
515 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 516 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
154eb18f | 517 | if (copy_from_user(&connect_data, (char __user *)data, |
4f046e7b | 518 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 519 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
520 | rets = -EFAULT; |
521 | goto out; | |
522 | } | |
ab841160 | 523 | |
154eb18f | 524 | rets = mei_ioctl_connect_client(file, &connect_data); |
4f046e7b TW |
525 | if (rets) |
526 | goto out; | |
ab841160 | 527 | |
4f046e7b | 528 | /* if all is ok, copying the data back to user. */ |
154eb18f | 529 | if (copy_to_user((char __user *)data, &connect_data, |
ab841160 | 530 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 531 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
532 | rets = -EFAULT; |
533 | goto out; | |
534 | } | |
535 | ||
536 | break; | |
154eb18f | 537 | |
3c7c8468 TW |
538 | case IOCTL_MEI_NOTIFY_SET: |
539 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); | |
540 | if (copy_from_user(¬ify_req, | |
541 | (char __user *)data, sizeof(notify_req))) { | |
542 | dev_dbg(dev->dev, "failed to copy data from userland\n"); | |
543 | rets = -EFAULT; | |
544 | goto out; | |
545 | } | |
546 | rets = mei_ioctl_client_notify_request(file, notify_req); | |
547 | break; | |
548 | ||
549 | case IOCTL_MEI_NOTIFY_GET: | |
550 | dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); | |
551 | rets = mei_ioctl_client_notify_get(file, ¬ify_get); | |
552 | if (rets) | |
553 | goto out; | |
554 | ||
555 | dev_dbg(dev->dev, "copy connect data to user\n"); | |
556 | if (copy_to_user((char __user *)data, | |
557 | ¬ify_get, sizeof(notify_get))) { | |
558 | dev_dbg(dev->dev, "failed to copy data to userland\n"); | |
559 | rets = -EFAULT; | |
560 | goto out; | |
561 | ||
562 | } | |
563 | break; | |
564 | ||
4f046e7b | 565 | default: |
2bf94cab | 566 | dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
4f046e7b | 567 | rets = -ENOIOCTLCMD; |
ab841160 OW |
568 | } |
569 | ||
570 | out: | |
ab841160 OW |
571 | mutex_unlock(&dev->device_lock); |
572 | return rets; | |
573 | } | |
574 | ||
575 | /** | |
576 | * mei_compat_ioctl - the compat IOCTL function | |
577 | * | |
578 | * @file: pointer to file structure | |
579 | * @cmd: ioctl command | |
580 | * @data: pointer to mei message structure | |
581 | * | |
a8605ea2 | 582 | * Return: 0 on success , <0 on error |
ab841160 OW |
583 | */ |
584 | #ifdef CONFIG_COMPAT | |
585 | static long mei_compat_ioctl(struct file *file, | |
441ab50f | 586 | unsigned int cmd, unsigned long data) |
ab841160 OW |
587 | { |
588 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); | |
589 | } | |
590 | #endif | |
591 | ||
592 | ||
593 | /** | |
594 | * mei_poll - the poll function | |
595 | * | |
596 | * @file: pointer to file structure | |
597 | * @wait: pointer to poll_table structure | |
598 | * | |
a8605ea2 | 599 | * Return: poll mask |
ab841160 OW |
600 | */ |
601 | static unsigned int mei_poll(struct file *file, poll_table *wait) | |
602 | { | |
1d9013f0 | 603 | unsigned long req_events = poll_requested_events(wait); |
ab841160 OW |
604 | struct mei_cl *cl = file->private_data; |
605 | struct mei_device *dev; | |
606 | unsigned int mask = 0; | |
2c84c297 | 607 | bool notify_en; |
ab841160 OW |
608 | |
609 | if (WARN_ON(!cl || !cl->dev)) | |
b950ac1d | 610 | return POLLERR; |
ab841160 OW |
611 | |
612 | dev = cl->dev; | |
613 | ||
614 | mutex_lock(&dev->device_lock); | |
615 | ||
2c84c297 | 616 | notify_en = cl->notify_en && (req_events & POLLPRI); |
f3de9b63 TW |
617 | |
618 | if (dev->dev_state != MEI_DEV_ENABLED || | |
619 | !mei_cl_is_connected(cl)) { | |
b950ac1d | 620 | mask = POLLERR; |
ab841160 OW |
621 | goto out; |
622 | } | |
623 | ||
1d9013f0 TW |
624 | if (cl == &dev->iamthif_cl) { |
625 | mask = mei_amthif_poll(dev, file, wait); | |
b950ac1d TW |
626 | goto out; |
627 | } | |
628 | ||
2c84c297 TW |
629 | if (notify_en) { |
630 | poll_wait(file, &cl->ev_wait, wait); | |
631 | if (cl->notify_ev) | |
632 | mask |= POLLPRI; | |
633 | } | |
634 | ||
1d9013f0 TW |
635 | if (req_events & (POLLIN | POLLRDNORM)) { |
636 | poll_wait(file, &cl->rx_wait, wait); | |
637 | ||
638 | if (!list_empty(&cl->rd_completed)) | |
639 | mask |= POLLIN | POLLRDNORM; | |
640 | else | |
641 | mei_cl_read_start(cl, 0, file); | |
642 | } | |
ab841160 OW |
643 | |
644 | out: | |
645 | mutex_unlock(&dev->device_lock); | |
646 | return mask; | |
647 | } | |
648 | ||
237092bf TW |
649 | /** |
650 | * mei_fasync - asynchronous io support | |
651 | * | |
652 | * @fd: file descriptor | |
653 | * @file: pointer to file structure | |
654 | * @band: band bitmap | |
655 | * | |
ed6dc538 TW |
656 | * Return: negative on error, |
657 | * 0 if it did no changes, | |
658 | * and positive a process was added or deleted | |
237092bf TW |
659 | */ |
660 | static int mei_fasync(int fd, struct file *file, int band) | |
661 | { | |
662 | ||
663 | struct mei_cl *cl = file->private_data; | |
664 | ||
665 | if (!mei_cl_is_connected(cl)) | |
ed6dc538 | 666 | return -ENODEV; |
237092bf TW |
667 | |
668 | return fasync_helper(fd, file, band, &cl->ev_async); | |
669 | } | |
670 | ||
55c4e640 TW |
671 | /** |
672 | * fw_status_show - mei device attribute show method | |
673 | * | |
674 | * @device: device pointer | |
675 | * @attr: attribute pointer | |
676 | * @buf: char out buffer | |
677 | * | |
678 | * Return: number of the bytes printed into buf or error | |
679 | */ | |
680 | static ssize_t fw_status_show(struct device *device, | |
681 | struct device_attribute *attr, char *buf) | |
682 | { | |
683 | struct mei_device *dev = dev_get_drvdata(device); | |
684 | struct mei_fw_status fw_status; | |
685 | int err, i; | |
686 | ssize_t cnt = 0; | |
687 | ||
688 | mutex_lock(&dev->device_lock); | |
689 | err = mei_fw_status(dev, &fw_status); | |
690 | mutex_unlock(&dev->device_lock); | |
691 | if (err) { | |
692 | dev_err(device, "read fw_status error = %d\n", err); | |
693 | return err; | |
694 | } | |
695 | ||
696 | for (i = 0; i < fw_status.count; i++) | |
697 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
698 | fw_status.status[i]); | |
699 | return cnt; | |
700 | } | |
701 | static DEVICE_ATTR_RO(fw_status); | |
702 | ||
703 | static struct attribute *mei_attrs[] = { | |
704 | &dev_attr_fw_status.attr, | |
705 | NULL | |
706 | }; | |
707 | ATTRIBUTE_GROUPS(mei); | |
708 | ||
5b881e3c OW |
709 | /* |
710 | * file operations structure will be used for mei char device. | |
711 | */ | |
712 | static const struct file_operations mei_fops = { | |
713 | .owner = THIS_MODULE, | |
714 | .read = mei_read, | |
715 | .unlocked_ioctl = mei_ioctl, | |
716 | #ifdef CONFIG_COMPAT | |
717 | .compat_ioctl = mei_compat_ioctl, | |
718 | #endif | |
719 | .open = mei_open, | |
720 | .release = mei_release, | |
721 | .write = mei_write, | |
722 | .poll = mei_poll, | |
237092bf | 723 | .fasync = mei_fasync, |
5b881e3c OW |
724 | .llseek = no_llseek |
725 | }; | |
726 | ||
f3d8e878 AU |
727 | static struct class *mei_class; |
728 | static dev_t mei_devt; | |
729 | #define MEI_MAX_DEVS MINORMASK | |
730 | static DEFINE_MUTEX(mei_minor_lock); | |
731 | static DEFINE_IDR(mei_idr); | |
732 | ||
733 | /** | |
734 | * mei_minor_get - obtain next free device minor number | |
735 | * | |
736 | * @dev: device pointer | |
737 | * | |
a8605ea2 | 738 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 739 | */ |
f3d8e878 AU |
740 | static int mei_minor_get(struct mei_device *dev) |
741 | { | |
742 | int ret; | |
743 | ||
744 | mutex_lock(&mei_minor_lock); | |
745 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
746 | if (ret >= 0) | |
747 | dev->minor = ret; | |
748 | else if (ret == -ENOSPC) | |
2bf94cab | 749 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 750 | |
f3d8e878 AU |
751 | mutex_unlock(&mei_minor_lock); |
752 | return ret; | |
753 | } | |
30e53bb8 | 754 | |
f3d8e878 AU |
755 | /** |
756 | * mei_minor_free - mark device minor number as free | |
757 | * | |
758 | * @dev: device pointer | |
759 | */ | |
760 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 761 | { |
f3d8e878 AU |
762 | mutex_lock(&mei_minor_lock); |
763 | idr_remove(&mei_idr, dev->minor); | |
764 | mutex_unlock(&mei_minor_lock); | |
765 | } | |
766 | ||
767 | int mei_register(struct mei_device *dev, struct device *parent) | |
768 | { | |
769 | struct device *clsdev; /* class device */ | |
770 | int ret, devno; | |
771 | ||
772 | ret = mei_minor_get(dev); | |
773 | if (ret < 0) | |
30e53bb8 TW |
774 | return ret; |
775 | ||
f3d8e878 AU |
776 | /* Fill in the data structures */ |
777 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
778 | cdev_init(&dev->cdev, &mei_fops); | |
154322f4 | 779 | dev->cdev.owner = parent->driver->owner; |
f3d8e878 AU |
780 | |
781 | /* Add the device */ | |
782 | ret = cdev_add(&dev->cdev, devno, 1); | |
783 | if (ret) { | |
784 | dev_err(parent, "unable to add device %d:%d\n", | |
785 | MAJOR(mei_devt), dev->minor); | |
786 | goto err_dev_add; | |
787 | } | |
788 | ||
55c4e640 TW |
789 | clsdev = device_create_with_groups(mei_class, parent, devno, |
790 | dev, mei_groups, | |
791 | "mei%d", dev->minor); | |
f3d8e878 AU |
792 | |
793 | if (IS_ERR(clsdev)) { | |
794 | dev_err(parent, "unable to create device %d:%d\n", | |
795 | MAJOR(mei_devt), dev->minor); | |
796 | ret = PTR_ERR(clsdev); | |
797 | goto err_dev_create; | |
798 | } | |
799 | ||
800 | ret = mei_dbgfs_register(dev, dev_name(clsdev)); | |
801 | if (ret) { | |
802 | dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); | |
803 | goto err_dev_dbgfs; | |
804 | } | |
30e53bb8 TW |
805 | |
806 | return 0; | |
f3d8e878 AU |
807 | |
808 | err_dev_dbgfs: | |
809 | device_destroy(mei_class, devno); | |
810 | err_dev_create: | |
811 | cdev_del(&dev->cdev); | |
812 | err_dev_add: | |
813 | mei_minor_free(dev); | |
814 | return ret; | |
5b881e3c | 815 | } |
40e0b67b | 816 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 817 | |
30e53bb8 | 818 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 819 | { |
f3d8e878 AU |
820 | int devno; |
821 | ||
822 | devno = dev->cdev.dev; | |
823 | cdev_del(&dev->cdev); | |
824 | ||
30e53bb8 | 825 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
826 | |
827 | device_destroy(mei_class, devno); | |
828 | ||
829 | mei_minor_free(dev); | |
5b881e3c | 830 | } |
40e0b67b | 831 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 832 | |
cf3baefb SO |
833 | static int __init mei_init(void) |
834 | { | |
f3d8e878 AU |
835 | int ret; |
836 | ||
837 | mei_class = class_create(THIS_MODULE, "mei"); | |
838 | if (IS_ERR(mei_class)) { | |
839 | pr_err("couldn't create class\n"); | |
840 | ret = PTR_ERR(mei_class); | |
841 | goto err; | |
842 | } | |
843 | ||
844 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
845 | if (ret < 0) { | |
846 | pr_err("unable to allocate char dev region\n"); | |
847 | goto err_class; | |
848 | } | |
849 | ||
850 | ret = mei_cl_bus_init(); | |
851 | if (ret < 0) { | |
852 | pr_err("unable to initialize bus\n"); | |
853 | goto err_chrdev; | |
854 | } | |
855 | ||
856 | return 0; | |
857 | ||
858 | err_chrdev: | |
859 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
860 | err_class: | |
861 | class_destroy(mei_class); | |
862 | err: | |
863 | return ret; | |
cf3baefb SO |
864 | } |
865 | ||
866 | static void __exit mei_exit(void) | |
867 | { | |
f3d8e878 AU |
868 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
869 | class_destroy(mei_class); | |
cf3baefb SO |
870 | mei_cl_bus_exit(); |
871 | } | |
872 | ||
873 | module_init(mei_init); | |
874 | module_exit(mei_exit); | |
875 | ||
40e0b67b TW |
876 | MODULE_AUTHOR("Intel Corporation"); |
877 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 878 | MODULE_LICENSE("GPL v2"); |
ab841160 | 879 |