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 | ||
ab841160 | 162 | if (cl == &dev->iamthif_cl) { |
19838fb8 | 163 | rets = mei_amthif_read(dev, file, ubuf, length, offset); |
ab841160 OW |
164 | goto out; |
165 | } | |
166 | ||
a9bed610 | 167 | cb = mei_cl_read_cb(cl, file); |
3d33ff24 | 168 | if (cb) { |
139aacf7 TW |
169 | /* read what left */ |
170 | if (cb->buf_idx > *offset) | |
171 | goto copy_buffer; | |
172 | /* offset is beyond buf_idx we have no more data return 0 */ | |
173 | if (cb->buf_idx > 0 && cb->buf_idx <= *offset) { | |
174 | rets = 0; | |
175 | goto free; | |
176 | } | |
177 | /* Offset needs to be cleaned for contiguous reads*/ | |
178 | if (cb->buf_idx == 0 && *offset > 0) | |
179 | *offset = 0; | |
180 | } else if (*offset > 0) { | |
ab841160 | 181 | *offset = 0; |
ab841160 OW |
182 | } |
183 | ||
bca67d68 | 184 | err = mei_cl_read_start(cl, length, file); |
ab841160 | 185 | if (err && err != -EBUSY) { |
292f82c8 | 186 | cl_dbg(dev, cl, "mei start read failure status = %d\n", err); |
ab841160 OW |
187 | rets = err; |
188 | goto out; | |
189 | } | |
190 | ||
a9bed610 | 191 | if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) { |
ab841160 OW |
192 | if (file->f_flags & O_NONBLOCK) { |
193 | rets = -EAGAIN; | |
194 | goto out; | |
195 | } | |
196 | ||
197 | mutex_unlock(&dev->device_lock); | |
198 | ||
199 | if (wait_event_interruptible(cl->rx_wait, | |
a9bed610 | 200 | (!list_empty(&cl->rd_completed)) || |
6a84d63d | 201 | (!mei_cl_is_connected(cl)))) { |
e2b31644 | 202 | |
ab841160 OW |
203 | if (signal_pending(current)) |
204 | return -EINTR; | |
205 | return -ERESTARTSYS; | |
206 | } | |
207 | ||
208 | mutex_lock(&dev->device_lock); | |
6a84d63d | 209 | if (!mei_cl_is_connected(cl)) { |
ab841160 OW |
210 | rets = -EBUSY; |
211 | goto out; | |
212 | } | |
213 | } | |
214 | ||
a9bed610 | 215 | cb = mei_cl_read_cb(cl, file); |
ab841160 | 216 | if (!cb) { |
eeabfcf5 AU |
217 | if (mei_cl_is_fixed_address(cl) && dev->allow_fixed_address) { |
218 | cb = mei_cl_read_cb(cl, NULL); | |
219 | if (cb) | |
220 | goto copy_buffer; | |
221 | } | |
ab841160 OW |
222 | rets = 0; |
223 | goto out; | |
224 | } | |
3d33ff24 | 225 | |
ab841160 | 226 | copy_buffer: |
3d33ff24 TW |
227 | /* now copy the data to user space */ |
228 | if (cb->status) { | |
229 | rets = cb->status; | |
292f82c8 | 230 | cl_dbg(dev, cl, "read operation failed %d\n", rets); |
3d33ff24 TW |
231 | goto free; |
232 | } | |
233 | ||
292f82c8 | 234 | cl_dbg(dev, cl, "buf.size = %d buf.idx = %ld\n", |
5db7514d | 235 | cb->buf.size, cb->buf_idx); |
ebb108ef | 236 | if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) { |
ab841160 OW |
237 | rets = -EMSGSIZE; |
238 | goto free; | |
239 | } | |
240 | ||
ebb108ef TW |
241 | /* length is being truncated to PAGE_SIZE, |
242 | * however buf_idx may point beyond that */ | |
243 | length = min_t(size_t, length, cb->buf_idx - *offset); | |
ab841160 | 244 | |
5db7514d | 245 | if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { |
2bf94cab | 246 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
ab841160 OW |
247 | rets = -EFAULT; |
248 | goto free; | |
249 | } | |
250 | ||
251 | rets = length; | |
252 | *offset += length; | |
ebb108ef | 253 | if ((unsigned long)*offset < cb->buf_idx) |
ab841160 OW |
254 | goto out; |
255 | ||
256 | free: | |
601a1efa | 257 | mei_io_cb_free(cb); |
928fa666 | 258 | |
ab841160 | 259 | out: |
292f82c8 | 260 | cl_dbg(dev, cl, "end mei read rets = %d\n", rets); |
ab841160 OW |
261 | mutex_unlock(&dev->device_lock); |
262 | return rets; | |
263 | } | |
ab841160 OW |
264 | /** |
265 | * mei_write - the write function. | |
266 | * | |
267 | * @file: pointer to file structure | |
268 | * @ubuf: pointer to user buffer | |
269 | * @length: buffer length | |
270 | * @offset: data offset in buffer | |
271 | * | |
a8605ea2 | 272 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
273 | */ |
274 | static ssize_t mei_write(struct file *file, const char __user *ubuf, | |
441ab50f | 275 | size_t length, loff_t *offset) |
ab841160 OW |
276 | { |
277 | struct mei_cl *cl = file->private_data; | |
278 | struct mei_cl_cb *write_cb = NULL; | |
ab841160 OW |
279 | struct mei_device *dev; |
280 | unsigned long timeout = 0; | |
281 | int rets; | |
ab841160 OW |
282 | |
283 | if (WARN_ON(!cl || !cl->dev)) | |
284 | return -ENODEV; | |
285 | ||
286 | dev = cl->dev; | |
287 | ||
288 | mutex_lock(&dev->device_lock); | |
289 | ||
b210d750 | 290 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 291 | rets = -ENODEV; |
4234a6de | 292 | goto out; |
ab841160 OW |
293 | } |
294 | ||
d49ed64a AU |
295 | if (!mei_cl_is_connected(cl)) { |
296 | cl_err(dev, cl, "is not connected"); | |
297 | rets = -ENODEV; | |
4234a6de | 298 | goto out; |
75f0ee15 | 299 | } |
dd5de1f1 | 300 | |
d49ed64a AU |
301 | if (!mei_me_cl_is_active(cl->me_cl)) { |
302 | rets = -ENOTTY; | |
dd5de1f1 TW |
303 | goto out; |
304 | } | |
305 | ||
d49ed64a | 306 | if (length > mei_cl_mtu(cl)) { |
dd5de1f1 | 307 | rets = -EFBIG; |
4234a6de | 308 | goto out; |
75f0ee15 TW |
309 | } |
310 | ||
d49ed64a AU |
311 | if (length == 0) { |
312 | rets = 0; | |
4234a6de | 313 | goto out; |
75f0ee15 | 314 | } |
d49ed64a | 315 | |
ab841160 | 316 | if (cl == &dev->iamthif_cl) { |
19838fb8 | 317 | write_cb = mei_amthif_find_read_list_entry(dev, file); |
ab841160 OW |
318 | |
319 | if (write_cb) { | |
320 | timeout = write_cb->read_time + | |
3870c320 | 321 | mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER); |
ab841160 | 322 | |
a9bed610 | 323 | if (time_after(jiffies, timeout)) { |
75f0ee15 | 324 | *offset = 0; |
601a1efa | 325 | mei_io_cb_free(write_cb); |
75f0ee15 | 326 | write_cb = NULL; |
ab841160 OW |
327 | } |
328 | } | |
329 | } | |
330 | ||
a9bed610 | 331 | *offset = 0; |
bca67d68 | 332 | write_cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
ab841160 | 333 | if (!write_cb) { |
33d28c92 | 334 | rets = -ENOMEM; |
4234a6de | 335 | goto out; |
ab841160 | 336 | } |
ab841160 | 337 | |
5db7514d | 338 | rets = copy_from_user(write_cb->buf.data, ubuf, length); |
d8b29efa | 339 | if (rets) { |
2bf94cab | 340 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 341 | rets = -EFAULT; |
4234a6de | 342 | goto out; |
d8b29efa | 343 | } |
ab841160 | 344 | |
ab841160 | 345 | if (cl == &dev->iamthif_cl) { |
8660172e | 346 | rets = mei_amthif_write(cl, write_cb); |
ab841160 | 347 | |
ab5c4a56 | 348 | if (rets) { |
2bf94cab | 349 | dev_err(dev->dev, |
1a1aca42 | 350 | "amthif write failed with status = %d\n", rets); |
4234a6de | 351 | goto out; |
ab841160 OW |
352 | } |
353 | mutex_unlock(&dev->device_lock); | |
75f0ee15 | 354 | return length; |
ab841160 OW |
355 | } |
356 | ||
4234a6de | 357 | rets = mei_cl_write(cl, write_cb, false); |
b0d0cf77 | 358 | out: |
ab841160 | 359 | mutex_unlock(&dev->device_lock); |
4234a6de TW |
360 | if (rets < 0) |
361 | mei_io_cb_free(write_cb); | |
ab841160 OW |
362 | return rets; |
363 | } | |
364 | ||
9f81abda TW |
365 | /** |
366 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
367 | * | |
9f81abda | 368 | * @file: private data of the file object |
a8605ea2 | 369 | * @data: IOCTL connect data, input and output parameters |
9f81abda TW |
370 | * |
371 | * Locking: called under "dev->device_lock" lock | |
372 | * | |
a8605ea2 | 373 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
374 | */ |
375 | static int mei_ioctl_connect_client(struct file *file, | |
376 | struct mei_connect_client_data *data) | |
377 | { | |
378 | struct mei_device *dev; | |
379 | struct mei_client *client; | |
d320832f | 380 | struct mei_me_client *me_cl; |
9f81abda | 381 | struct mei_cl *cl; |
9f81abda TW |
382 | int rets; |
383 | ||
384 | cl = file->private_data; | |
9f81abda TW |
385 | dev = cl->dev; |
386 | ||
79563db9 TW |
387 | if (dev->dev_state != MEI_DEV_ENABLED) |
388 | return -ENODEV; | |
9f81abda TW |
389 | |
390 | if (cl->state != MEI_FILE_INITIALIZING && | |
79563db9 TW |
391 | cl->state != MEI_FILE_DISCONNECTED) |
392 | return -EBUSY; | |
9f81abda TW |
393 | |
394 | /* find ME client we're trying to connect to */ | |
d320832f | 395 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
eeabfcf5 AU |
396 | if (!me_cl || |
397 | (me_cl->props.fixed_address && !dev->allow_fixed_address)) { | |
2bf94cab | 398 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
d49ed64a AU |
399 | &data->in_client_uuid); |
400 | mei_me_cl_put(me_cl); | |
79563db9 | 401 | return -ENOTTY; |
9f81abda TW |
402 | } |
403 | ||
2bf94cab | 404 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
d49ed64a | 405 | me_cl->client_id); |
2bf94cab | 406 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 407 | me_cl->props.protocol_version); |
2bf94cab | 408 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 409 | me_cl->props.max_msg_length); |
9f81abda | 410 | |
1a1aca42 | 411 | /* if we're connecting to amthif client then we will use the |
9f81abda TW |
412 | * existing connection |
413 | */ | |
1a1aca42 | 414 | if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) { |
2bf94cab | 415 | dev_dbg(dev->dev, "FW Client is amthi\n"); |
f3de9b63 | 416 | if (!mei_cl_is_connected(&dev->iamthif_cl)) { |
9f81abda TW |
417 | rets = -ENODEV; |
418 | goto end; | |
419 | } | |
9f81abda TW |
420 | mei_cl_unlink(cl); |
421 | ||
422 | kfree(cl); | |
423 | cl = NULL; | |
22f96a0e | 424 | dev->iamthif_open_count++; |
9f81abda TW |
425 | file->private_data = &dev->iamthif_cl; |
426 | ||
427 | client = &data->out_client_properties; | |
d320832f TW |
428 | client->max_msg_length = me_cl->props.max_msg_length; |
429 | client->protocol_version = me_cl->props.protocol_version; | |
9f81abda TW |
430 | rets = dev->iamthif_cl.status; |
431 | ||
432 | goto end; | |
433 | } | |
434 | ||
9f81abda TW |
435 | /* prepare the output buffer */ |
436 | client = &data->out_client_properties; | |
d320832f TW |
437 | client->max_msg_length = me_cl->props.max_msg_length; |
438 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 439 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 440 | |
d49ed64a | 441 | rets = mei_cl_connect(cl, me_cl, file); |
9f81abda TW |
442 | |
443 | end: | |
79563db9 | 444 | mei_me_cl_put(me_cl); |
9f81abda TW |
445 | return rets; |
446 | } | |
447 | ||
ab841160 OW |
448 | /** |
449 | * mei_ioctl - the IOCTL function | |
450 | * | |
451 | * @file: pointer to file structure | |
452 | * @cmd: ioctl command | |
453 | * @data: pointer to mei message structure | |
454 | * | |
a8605ea2 | 455 | * Return: 0 on success , <0 on error |
ab841160 OW |
456 | */ |
457 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
458 | { | |
459 | struct mei_device *dev; | |
460 | struct mei_cl *cl = file->private_data; | |
154eb18f | 461 | struct mei_connect_client_data connect_data; |
ab841160 OW |
462 | int rets; |
463 | ||
ab841160 OW |
464 | |
465 | if (WARN_ON(!cl || !cl->dev)) | |
466 | return -ENODEV; | |
467 | ||
468 | dev = cl->dev; | |
469 | ||
2bf94cab | 470 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
471 | |
472 | mutex_lock(&dev->device_lock); | |
b210d750 | 473 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
474 | rets = -ENODEV; |
475 | goto out; | |
476 | } | |
477 | ||
4f046e7b TW |
478 | switch (cmd) { |
479 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 480 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
154eb18f | 481 | if (copy_from_user(&connect_data, (char __user *)data, |
4f046e7b | 482 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 483 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
484 | rets = -EFAULT; |
485 | goto out; | |
486 | } | |
ab841160 | 487 | |
154eb18f | 488 | rets = mei_ioctl_connect_client(file, &connect_data); |
4f046e7b TW |
489 | if (rets) |
490 | goto out; | |
ab841160 | 491 | |
4f046e7b | 492 | /* if all is ok, copying the data back to user. */ |
154eb18f | 493 | if (copy_to_user((char __user *)data, &connect_data, |
ab841160 | 494 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 495 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
496 | rets = -EFAULT; |
497 | goto out; | |
498 | } | |
499 | ||
500 | break; | |
154eb18f | 501 | |
4f046e7b | 502 | default: |
2bf94cab | 503 | dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
4f046e7b | 504 | rets = -ENOIOCTLCMD; |
ab841160 OW |
505 | } |
506 | ||
507 | out: | |
ab841160 OW |
508 | mutex_unlock(&dev->device_lock); |
509 | return rets; | |
510 | } | |
511 | ||
512 | /** | |
513 | * mei_compat_ioctl - the compat IOCTL function | |
514 | * | |
515 | * @file: pointer to file structure | |
516 | * @cmd: ioctl command | |
517 | * @data: pointer to mei message structure | |
518 | * | |
a8605ea2 | 519 | * Return: 0 on success , <0 on error |
ab841160 OW |
520 | */ |
521 | #ifdef CONFIG_COMPAT | |
522 | static long mei_compat_ioctl(struct file *file, | |
441ab50f | 523 | unsigned int cmd, unsigned long data) |
ab841160 OW |
524 | { |
525 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); | |
526 | } | |
527 | #endif | |
528 | ||
529 | ||
530 | /** | |
531 | * mei_poll - the poll function | |
532 | * | |
533 | * @file: pointer to file structure | |
534 | * @wait: pointer to poll_table structure | |
535 | * | |
a8605ea2 | 536 | * Return: poll mask |
ab841160 OW |
537 | */ |
538 | static unsigned int mei_poll(struct file *file, poll_table *wait) | |
539 | { | |
1d9013f0 | 540 | unsigned long req_events = poll_requested_events(wait); |
ab841160 OW |
541 | struct mei_cl *cl = file->private_data; |
542 | struct mei_device *dev; | |
543 | unsigned int mask = 0; | |
544 | ||
545 | if (WARN_ON(!cl || !cl->dev)) | |
b950ac1d | 546 | return POLLERR; |
ab841160 OW |
547 | |
548 | dev = cl->dev; | |
549 | ||
550 | mutex_lock(&dev->device_lock); | |
551 | ||
f3de9b63 TW |
552 | |
553 | if (dev->dev_state != MEI_DEV_ENABLED || | |
554 | !mei_cl_is_connected(cl)) { | |
b950ac1d | 555 | mask = POLLERR; |
ab841160 OW |
556 | goto out; |
557 | } | |
558 | ||
1d9013f0 TW |
559 | if (cl == &dev->iamthif_cl) { |
560 | mask = mei_amthif_poll(dev, file, wait); | |
b950ac1d TW |
561 | goto out; |
562 | } | |
563 | ||
1d9013f0 TW |
564 | if (req_events & (POLLIN | POLLRDNORM)) { |
565 | poll_wait(file, &cl->rx_wait, wait); | |
566 | ||
567 | if (!list_empty(&cl->rd_completed)) | |
568 | mask |= POLLIN | POLLRDNORM; | |
569 | else | |
570 | mei_cl_read_start(cl, 0, file); | |
571 | } | |
ab841160 OW |
572 | |
573 | out: | |
574 | mutex_unlock(&dev->device_lock); | |
575 | return mask; | |
576 | } | |
577 | ||
55c4e640 TW |
578 | /** |
579 | * fw_status_show - mei device attribute show method | |
580 | * | |
581 | * @device: device pointer | |
582 | * @attr: attribute pointer | |
583 | * @buf: char out buffer | |
584 | * | |
585 | * Return: number of the bytes printed into buf or error | |
586 | */ | |
587 | static ssize_t fw_status_show(struct device *device, | |
588 | struct device_attribute *attr, char *buf) | |
589 | { | |
590 | struct mei_device *dev = dev_get_drvdata(device); | |
591 | struct mei_fw_status fw_status; | |
592 | int err, i; | |
593 | ssize_t cnt = 0; | |
594 | ||
595 | mutex_lock(&dev->device_lock); | |
596 | err = mei_fw_status(dev, &fw_status); | |
597 | mutex_unlock(&dev->device_lock); | |
598 | if (err) { | |
599 | dev_err(device, "read fw_status error = %d\n", err); | |
600 | return err; | |
601 | } | |
602 | ||
603 | for (i = 0; i < fw_status.count; i++) | |
604 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
605 | fw_status.status[i]); | |
606 | return cnt; | |
607 | } | |
608 | static DEVICE_ATTR_RO(fw_status); | |
609 | ||
610 | static struct attribute *mei_attrs[] = { | |
611 | &dev_attr_fw_status.attr, | |
612 | NULL | |
613 | }; | |
614 | ATTRIBUTE_GROUPS(mei); | |
615 | ||
5b881e3c OW |
616 | /* |
617 | * file operations structure will be used for mei char device. | |
618 | */ | |
619 | static const struct file_operations mei_fops = { | |
620 | .owner = THIS_MODULE, | |
621 | .read = mei_read, | |
622 | .unlocked_ioctl = mei_ioctl, | |
623 | #ifdef CONFIG_COMPAT | |
624 | .compat_ioctl = mei_compat_ioctl, | |
625 | #endif | |
626 | .open = mei_open, | |
627 | .release = mei_release, | |
628 | .write = mei_write, | |
629 | .poll = mei_poll, | |
630 | .llseek = no_llseek | |
631 | }; | |
632 | ||
f3d8e878 AU |
633 | static struct class *mei_class; |
634 | static dev_t mei_devt; | |
635 | #define MEI_MAX_DEVS MINORMASK | |
636 | static DEFINE_MUTEX(mei_minor_lock); | |
637 | static DEFINE_IDR(mei_idr); | |
638 | ||
639 | /** | |
640 | * mei_minor_get - obtain next free device minor number | |
641 | * | |
642 | * @dev: device pointer | |
643 | * | |
a8605ea2 | 644 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 645 | */ |
f3d8e878 AU |
646 | static int mei_minor_get(struct mei_device *dev) |
647 | { | |
648 | int ret; | |
649 | ||
650 | mutex_lock(&mei_minor_lock); | |
651 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
652 | if (ret >= 0) | |
653 | dev->minor = ret; | |
654 | else if (ret == -ENOSPC) | |
2bf94cab | 655 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 656 | |
f3d8e878 AU |
657 | mutex_unlock(&mei_minor_lock); |
658 | return ret; | |
659 | } | |
30e53bb8 | 660 | |
f3d8e878 AU |
661 | /** |
662 | * mei_minor_free - mark device minor number as free | |
663 | * | |
664 | * @dev: device pointer | |
665 | */ | |
666 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 667 | { |
f3d8e878 AU |
668 | mutex_lock(&mei_minor_lock); |
669 | idr_remove(&mei_idr, dev->minor); | |
670 | mutex_unlock(&mei_minor_lock); | |
671 | } | |
672 | ||
673 | int mei_register(struct mei_device *dev, struct device *parent) | |
674 | { | |
675 | struct device *clsdev; /* class device */ | |
676 | int ret, devno; | |
677 | ||
678 | ret = mei_minor_get(dev); | |
679 | if (ret < 0) | |
30e53bb8 TW |
680 | return ret; |
681 | ||
f3d8e878 AU |
682 | /* Fill in the data structures */ |
683 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
684 | cdev_init(&dev->cdev, &mei_fops); | |
154322f4 | 685 | dev->cdev.owner = parent->driver->owner; |
f3d8e878 AU |
686 | |
687 | /* Add the device */ | |
688 | ret = cdev_add(&dev->cdev, devno, 1); | |
689 | if (ret) { | |
690 | dev_err(parent, "unable to add device %d:%d\n", | |
691 | MAJOR(mei_devt), dev->minor); | |
692 | goto err_dev_add; | |
693 | } | |
694 | ||
55c4e640 TW |
695 | clsdev = device_create_with_groups(mei_class, parent, devno, |
696 | dev, mei_groups, | |
697 | "mei%d", dev->minor); | |
f3d8e878 AU |
698 | |
699 | if (IS_ERR(clsdev)) { | |
700 | dev_err(parent, "unable to create device %d:%d\n", | |
701 | MAJOR(mei_devt), dev->minor); | |
702 | ret = PTR_ERR(clsdev); | |
703 | goto err_dev_create; | |
704 | } | |
705 | ||
706 | ret = mei_dbgfs_register(dev, dev_name(clsdev)); | |
707 | if (ret) { | |
708 | dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); | |
709 | goto err_dev_dbgfs; | |
710 | } | |
30e53bb8 TW |
711 | |
712 | return 0; | |
f3d8e878 AU |
713 | |
714 | err_dev_dbgfs: | |
715 | device_destroy(mei_class, devno); | |
716 | err_dev_create: | |
717 | cdev_del(&dev->cdev); | |
718 | err_dev_add: | |
719 | mei_minor_free(dev); | |
720 | return ret; | |
5b881e3c | 721 | } |
40e0b67b | 722 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 723 | |
30e53bb8 | 724 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 725 | { |
f3d8e878 AU |
726 | int devno; |
727 | ||
728 | devno = dev->cdev.dev; | |
729 | cdev_del(&dev->cdev); | |
730 | ||
30e53bb8 | 731 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
732 | |
733 | device_destroy(mei_class, devno); | |
734 | ||
735 | mei_minor_free(dev); | |
5b881e3c | 736 | } |
40e0b67b | 737 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 738 | |
cf3baefb SO |
739 | static int __init mei_init(void) |
740 | { | |
f3d8e878 AU |
741 | int ret; |
742 | ||
743 | mei_class = class_create(THIS_MODULE, "mei"); | |
744 | if (IS_ERR(mei_class)) { | |
745 | pr_err("couldn't create class\n"); | |
746 | ret = PTR_ERR(mei_class); | |
747 | goto err; | |
748 | } | |
749 | ||
750 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
751 | if (ret < 0) { | |
752 | pr_err("unable to allocate char dev region\n"); | |
753 | goto err_class; | |
754 | } | |
755 | ||
756 | ret = mei_cl_bus_init(); | |
757 | if (ret < 0) { | |
758 | pr_err("unable to initialize bus\n"); | |
759 | goto err_chrdev; | |
760 | } | |
761 | ||
762 | return 0; | |
763 | ||
764 | err_chrdev: | |
765 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
766 | err_class: | |
767 | class_destroy(mei_class); | |
768 | err: | |
769 | return ret; | |
cf3baefb SO |
770 | } |
771 | ||
772 | static void __exit mei_exit(void) | |
773 | { | |
f3d8e878 AU |
774 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
775 | class_destroy(mei_class); | |
cf3baefb SO |
776 | mei_cl_bus_exit(); |
777 | } | |
778 | ||
779 | module_init(mei_init); | |
780 | module_exit(mei_exit); | |
781 | ||
40e0b67b TW |
782 | MODULE_AUTHOR("Intel Corporation"); |
783 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 784 | MODULE_LICENSE("GPL v2"); |
ab841160 | 785 |