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> | |
25 | #include <linux/aio.h> | |
ab841160 OW |
26 | #include <linux/poll.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/ioctl.h> | |
29 | #include <linux/cdev.h> | |
ab841160 OW |
30 | #include <linux/sched.h> |
31 | #include <linux/uuid.h> | |
32 | #include <linux/compat.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/interrupt.h> | |
35 | ||
4f3afe1d | 36 | #include <linux/mei.h> |
47a73801 TW |
37 | |
38 | #include "mei_dev.h" | |
90e0b5f1 | 39 | #include "client.h" |
ab841160 | 40 | |
ab841160 OW |
41 | /** |
42 | * mei_open - the open function | |
43 | * | |
44 | * @inode: pointer to inode structure | |
45 | * @file: pointer to file structure | |
83ce0741 | 46 | * |
a8605ea2 | 47 | * Return: 0 on success, <0 on error |
ab841160 OW |
48 | */ |
49 | static int mei_open(struct inode *inode, struct file *file) | |
50 | { | |
ab841160 | 51 | struct mei_device *dev; |
f3d8e878 | 52 | struct mei_cl *cl; |
2703d4b2 | 53 | |
6f37aca8 | 54 | int err; |
ab841160 | 55 | |
f3d8e878 | 56 | dev = container_of(inode->i_cdev, struct mei_device, cdev); |
5b881e3c | 57 | if (!dev) |
e036cc57 | 58 | return -ENODEV; |
ab841160 OW |
59 | |
60 | mutex_lock(&dev->device_lock); | |
e036cc57 | 61 | |
b210d750 | 62 | if (dev->dev_state != MEI_DEV_ENABLED) { |
2bf94cab | 63 | dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n", |
b210d750 | 64 | mei_dev_state_str(dev->dev_state)); |
03b8d341 | 65 | err = -ENODEV; |
e036cc57 | 66 | goto err_unlock; |
1b812947 | 67 | } |
ab841160 | 68 | |
03b8d341 TW |
69 | cl = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY); |
70 | if (IS_ERR(cl)) { | |
71 | err = PTR_ERR(cl); | |
e036cc57 | 72 | goto err_unlock; |
03b8d341 | 73 | } |
ab841160 OW |
74 | |
75 | file->private_data = cl; | |
e036cc57 | 76 | |
ab841160 OW |
77 | mutex_unlock(&dev->device_lock); |
78 | ||
5b881e3c | 79 | return nonseekable_open(inode, file); |
ab841160 | 80 | |
e036cc57 | 81 | err_unlock: |
ab841160 | 82 | mutex_unlock(&dev->device_lock); |
ab841160 OW |
83 | return err; |
84 | } | |
85 | ||
86 | /** | |
87 | * mei_release - the release function | |
88 | * | |
89 | * @inode: pointer to inode structure | |
90 | * @file: pointer to file structure | |
91 | * | |
a8605ea2 | 92 | * Return: 0 on success, <0 on error |
ab841160 OW |
93 | */ |
94 | static int mei_release(struct inode *inode, struct file *file) | |
95 | { | |
96 | struct mei_cl *cl = file->private_data; | |
ab841160 OW |
97 | struct mei_device *dev; |
98 | int rets = 0; | |
99 | ||
100 | if (WARN_ON(!cl || !cl->dev)) | |
101 | return -ENODEV; | |
102 | ||
103 | dev = cl->dev; | |
104 | ||
105 | mutex_lock(&dev->device_lock); | |
a562d5c2 TW |
106 | if (cl == &dev->iamthif_cl) { |
107 | rets = mei_amthif_release(dev, file); | |
108 | goto out; | |
109 | } | |
110 | if (cl->state == MEI_FILE_CONNECTED) { | |
111 | cl->state = MEI_FILE_DISCONNECTING; | |
46922186 | 112 | cl_dbg(dev, cl, "disconnecting\n"); |
90e0b5f1 | 113 | rets = mei_cl_disconnect(cl); |
a562d5c2 | 114 | } |
a9bed610 | 115 | mei_cl_flush_queues(cl, file); |
46922186 | 116 | cl_dbg(dev, cl, "removing\n"); |
a562d5c2 | 117 | |
90e0b5f1 | 118 | mei_cl_unlink(cl); |
a562d5c2 | 119 | |
a562d5c2 | 120 | file->private_data = NULL; |
ab841160 | 121 | |
a562d5c2 TW |
122 | kfree(cl); |
123 | out: | |
ab841160 OW |
124 | mutex_unlock(&dev->device_lock); |
125 | return rets; | |
126 | } | |
127 | ||
128 | ||
129 | /** | |
130 | * mei_read - the read function. | |
131 | * | |
132 | * @file: pointer to file structure | |
133 | * @ubuf: pointer to user buffer | |
134 | * @length: buffer length | |
135 | * @offset: data offset in buffer | |
136 | * | |
a8605ea2 | 137 | * Return: >=0 data length on success , <0 on error |
ab841160 OW |
138 | */ |
139 | static ssize_t mei_read(struct file *file, char __user *ubuf, | |
441ab50f | 140 | size_t length, loff_t *offset) |
ab841160 OW |
141 | { |
142 | struct mei_cl *cl = file->private_data; | |
ab841160 | 143 | struct mei_device *dev; |
a9bed610 | 144 | struct mei_cl_cb *cb = NULL; |
ab841160 OW |
145 | int rets; |
146 | int err; | |
147 | ||
148 | ||
149 | if (WARN_ON(!cl || !cl->dev)) | |
150 | return -ENODEV; | |
151 | ||
152 | dev = cl->dev; | |
153 | ||
dd5de1f1 | 154 | |
ab841160 | 155 | mutex_lock(&dev->device_lock); |
b210d750 | 156 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
157 | rets = -ENODEV; |
158 | goto out; | |
159 | } | |
160 | ||
dd5de1f1 TW |
161 | if (length == 0) { |
162 | rets = 0; | |
163 | goto out; | |
164 | } | |
165 | ||
ab841160 | 166 | if (cl == &dev->iamthif_cl) { |
19838fb8 | 167 | rets = mei_amthif_read(dev, file, ubuf, length, offset); |
ab841160 OW |
168 | goto out; |
169 | } | |
170 | ||
a9bed610 | 171 | cb = mei_cl_read_cb(cl, file); |
3d33ff24 | 172 | if (cb) { |
139aacf7 TW |
173 | /* read what left */ |
174 | if (cb->buf_idx > *offset) | |
175 | goto copy_buffer; | |
176 | /* offset is beyond buf_idx we have no more data return 0 */ | |
177 | if (cb->buf_idx > 0 && cb->buf_idx <= *offset) { | |
178 | rets = 0; | |
179 | goto free; | |
180 | } | |
181 | /* Offset needs to be cleaned for contiguous reads*/ | |
182 | if (cb->buf_idx == 0 && *offset > 0) | |
183 | *offset = 0; | |
184 | } else if (*offset > 0) { | |
ab841160 | 185 | *offset = 0; |
ab841160 OW |
186 | } |
187 | ||
bca67d68 | 188 | err = mei_cl_read_start(cl, length, file); |
ab841160 | 189 | if (err && err != -EBUSY) { |
2bf94cab | 190 | dev_dbg(dev->dev, |
ab841160 OW |
191 | "mei start read failure with status = %d\n", err); |
192 | rets = err; | |
193 | goto out; | |
194 | } | |
195 | ||
a9bed610 | 196 | if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) { |
ab841160 OW |
197 | if (file->f_flags & O_NONBLOCK) { |
198 | rets = -EAGAIN; | |
199 | goto out; | |
200 | } | |
201 | ||
202 | mutex_unlock(&dev->device_lock); | |
203 | ||
204 | if (wait_event_interruptible(cl->rx_wait, | |
a9bed610 | 205 | (!list_empty(&cl->rd_completed)) || |
e2b31644 TW |
206 | mei_cl_is_transitioning(cl))) { |
207 | ||
ab841160 OW |
208 | if (signal_pending(current)) |
209 | return -EINTR; | |
210 | return -ERESTARTSYS; | |
211 | } | |
212 | ||
213 | mutex_lock(&dev->device_lock); | |
e2b31644 | 214 | if (mei_cl_is_transitioning(cl)) { |
ab841160 OW |
215 | rets = -EBUSY; |
216 | goto out; | |
217 | } | |
218 | } | |
219 | ||
a9bed610 | 220 | cb = mei_cl_read_cb(cl, file); |
ab841160 | 221 | if (!cb) { |
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; | |
230 | dev_dbg(dev->dev, "read operation failed %d\n", rets); | |
231 | goto free; | |
232 | } | |
233 | ||
2bf94cab | 234 | dev_dbg(dev->dev, "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: |
2bf94cab | 260 | dev_dbg(dev->dev, "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; | |
79563db9 | 278 | struct mei_me_client *me_cl = NULL; |
ab841160 | 279 | struct mei_cl_cb *write_cb = NULL; |
ab841160 OW |
280 | struct mei_device *dev; |
281 | unsigned long timeout = 0; | |
282 | int rets; | |
ab841160 OW |
283 | |
284 | if (WARN_ON(!cl || !cl->dev)) | |
285 | return -ENODEV; | |
286 | ||
287 | dev = cl->dev; | |
288 | ||
289 | mutex_lock(&dev->device_lock); | |
290 | ||
b210d750 | 291 | if (dev->dev_state != MEI_DEV_ENABLED) { |
75f0ee15 | 292 | rets = -ENODEV; |
4234a6de | 293 | goto out; |
ab841160 OW |
294 | } |
295 | ||
d880f329 | 296 | me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id); |
d320832f | 297 | if (!me_cl) { |
7ca96aa2 | 298 | rets = -ENOTTY; |
4234a6de | 299 | goto out; |
75f0ee15 | 300 | } |
dd5de1f1 TW |
301 | |
302 | if (length == 0) { | |
303 | rets = 0; | |
304 | goto out; | |
305 | } | |
306 | ||
d320832f | 307 | if (length > me_cl->props.max_msg_length) { |
dd5de1f1 | 308 | rets = -EFBIG; |
4234a6de | 309 | goto out; |
75f0ee15 TW |
310 | } |
311 | ||
312 | if (cl->state != MEI_FILE_CONNECTED) { | |
2bf94cab | 313 | dev_err(dev->dev, "host client = %d, is not connected to ME client = %d", |
75f0ee15 | 314 | cl->host_client_id, cl->me_client_id); |
4234a6de TW |
315 | rets = -ENODEV; |
316 | goto out; | |
75f0ee15 | 317 | } |
ab841160 | 318 | if (cl == &dev->iamthif_cl) { |
19838fb8 | 319 | write_cb = mei_amthif_find_read_list_entry(dev, file); |
ab841160 OW |
320 | |
321 | if (write_cb) { | |
322 | timeout = write_cb->read_time + | |
3870c320 | 323 | mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER); |
ab841160 | 324 | |
a9bed610 | 325 | if (time_after(jiffies, timeout)) { |
75f0ee15 | 326 | *offset = 0; |
601a1efa | 327 | mei_io_cb_free(write_cb); |
75f0ee15 | 328 | write_cb = NULL; |
ab841160 OW |
329 | } |
330 | } | |
331 | } | |
332 | ||
a9bed610 | 333 | *offset = 0; |
bca67d68 | 334 | write_cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); |
ab841160 | 335 | if (!write_cb) { |
33d28c92 | 336 | rets = -ENOMEM; |
4234a6de | 337 | goto out; |
ab841160 | 338 | } |
ab841160 | 339 | |
5db7514d | 340 | rets = copy_from_user(write_cb->buf.data, ubuf, length); |
d8b29efa | 341 | if (rets) { |
2bf94cab | 342 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
d8b29efa | 343 | rets = -EFAULT; |
4234a6de | 344 | goto out; |
d8b29efa | 345 | } |
ab841160 | 346 | |
ab841160 | 347 | if (cl == &dev->iamthif_cl) { |
8660172e | 348 | rets = mei_amthif_write(cl, write_cb); |
ab841160 | 349 | |
ab5c4a56 | 350 | if (rets) { |
2bf94cab | 351 | dev_err(dev->dev, |
1a1aca42 | 352 | "amthif write failed with status = %d\n", rets); |
4234a6de | 353 | goto out; |
ab841160 | 354 | } |
79563db9 | 355 | mei_me_cl_put(me_cl); |
ab841160 | 356 | mutex_unlock(&dev->device_lock); |
75f0ee15 | 357 | return length; |
ab841160 OW |
358 | } |
359 | ||
4234a6de | 360 | rets = mei_cl_write(cl, write_cb, false); |
b0d0cf77 | 361 | out: |
79563db9 | 362 | mei_me_cl_put(me_cl); |
ab841160 | 363 | mutex_unlock(&dev->device_lock); |
4234a6de TW |
364 | if (rets < 0) |
365 | mei_io_cb_free(write_cb); | |
ab841160 OW |
366 | return rets; |
367 | } | |
368 | ||
9f81abda TW |
369 | /** |
370 | * mei_ioctl_connect_client - the connect to fw client IOCTL function | |
371 | * | |
9f81abda | 372 | * @file: private data of the file object |
a8605ea2 | 373 | * @data: IOCTL connect data, input and output parameters |
9f81abda TW |
374 | * |
375 | * Locking: called under "dev->device_lock" lock | |
376 | * | |
a8605ea2 | 377 | * Return: 0 on success, <0 on failure. |
9f81abda TW |
378 | */ |
379 | static int mei_ioctl_connect_client(struct file *file, | |
380 | struct mei_connect_client_data *data) | |
381 | { | |
382 | struct mei_device *dev; | |
383 | struct mei_client *client; | |
d320832f | 384 | struct mei_me_client *me_cl; |
9f81abda | 385 | struct mei_cl *cl; |
9f81abda TW |
386 | int rets; |
387 | ||
388 | cl = file->private_data; | |
9f81abda TW |
389 | dev = cl->dev; |
390 | ||
79563db9 TW |
391 | if (dev->dev_state != MEI_DEV_ENABLED) |
392 | return -ENODEV; | |
9f81abda TW |
393 | |
394 | if (cl->state != MEI_FILE_INITIALIZING && | |
79563db9 TW |
395 | cl->state != MEI_FILE_DISCONNECTED) |
396 | return -EBUSY; | |
9f81abda TW |
397 | |
398 | /* find ME client we're trying to connect to */ | |
d320832f TW |
399 | me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); |
400 | if (!me_cl || me_cl->props.fixed_address) { | |
2bf94cab | 401 | dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
80fe6361 | 402 | &data->in_client_uuid); |
79563db9 | 403 | return -ENOTTY; |
9f81abda TW |
404 | } |
405 | ||
d320832f | 406 | cl->me_client_id = me_cl->client_id; |
d880f329 | 407 | cl->cl_uuid = me_cl->props.protocol_name; |
80fe6361 | 408 | |
2bf94cab | 409 | dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", |
9f81abda | 410 | cl->me_client_id); |
2bf94cab | 411 | dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", |
d320832f | 412 | me_cl->props.protocol_version); |
2bf94cab | 413 | dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", |
d320832f | 414 | me_cl->props.max_msg_length); |
9f81abda | 415 | |
1a1aca42 | 416 | /* if we're connecting to amthif client then we will use the |
9f81abda TW |
417 | * existing connection |
418 | */ | |
1a1aca42 | 419 | if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) { |
2bf94cab | 420 | dev_dbg(dev->dev, "FW Client is amthi\n"); |
9f81abda TW |
421 | if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) { |
422 | rets = -ENODEV; | |
423 | goto end; | |
424 | } | |
9f81abda TW |
425 | mei_cl_unlink(cl); |
426 | ||
427 | kfree(cl); | |
428 | cl = NULL; | |
22f96a0e | 429 | dev->iamthif_open_count++; |
9f81abda TW |
430 | file->private_data = &dev->iamthif_cl; |
431 | ||
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; | |
9f81abda TW |
435 | rets = dev->iamthif_cl.status; |
436 | ||
437 | goto end; | |
438 | } | |
439 | ||
9f81abda TW |
440 | /* prepare the output buffer */ |
441 | client = &data->out_client_properties; | |
d320832f TW |
442 | client->max_msg_length = me_cl->props.max_msg_length; |
443 | client->protocol_version = me_cl->props.protocol_version; | |
2bf94cab | 444 | dev_dbg(dev->dev, "Can connect?\n"); |
9f81abda | 445 | |
9f81abda TW |
446 | rets = mei_cl_connect(cl, file); |
447 | ||
448 | end: | |
79563db9 | 449 | mei_me_cl_put(me_cl); |
9f81abda TW |
450 | return rets; |
451 | } | |
452 | ||
ab841160 OW |
453 | /** |
454 | * mei_ioctl - the IOCTL function | |
455 | * | |
456 | * @file: pointer to file structure | |
457 | * @cmd: ioctl command | |
458 | * @data: pointer to mei message structure | |
459 | * | |
a8605ea2 | 460 | * Return: 0 on success , <0 on error |
ab841160 OW |
461 | */ |
462 | static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) | |
463 | { | |
464 | struct mei_device *dev; | |
465 | struct mei_cl *cl = file->private_data; | |
154eb18f | 466 | struct mei_connect_client_data connect_data; |
ab841160 OW |
467 | int rets; |
468 | ||
ab841160 OW |
469 | |
470 | if (WARN_ON(!cl || !cl->dev)) | |
471 | return -ENODEV; | |
472 | ||
473 | dev = cl->dev; | |
474 | ||
2bf94cab | 475 | dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); |
ab841160 OW |
476 | |
477 | mutex_lock(&dev->device_lock); | |
b210d750 | 478 | if (dev->dev_state != MEI_DEV_ENABLED) { |
ab841160 OW |
479 | rets = -ENODEV; |
480 | goto out; | |
481 | } | |
482 | ||
4f046e7b TW |
483 | switch (cmd) { |
484 | case IOCTL_MEI_CONNECT_CLIENT: | |
2bf94cab | 485 | dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); |
154eb18f | 486 | if (copy_from_user(&connect_data, (char __user *)data, |
4f046e7b | 487 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 488 | dev_dbg(dev->dev, "failed to copy data from userland\n"); |
4f046e7b TW |
489 | rets = -EFAULT; |
490 | goto out; | |
491 | } | |
ab841160 | 492 | |
154eb18f | 493 | rets = mei_ioctl_connect_client(file, &connect_data); |
4f046e7b TW |
494 | if (rets) |
495 | goto out; | |
ab841160 | 496 | |
4f046e7b | 497 | /* if all is ok, copying the data back to user. */ |
154eb18f | 498 | if (copy_to_user((char __user *)data, &connect_data, |
ab841160 | 499 | sizeof(struct mei_connect_client_data))) { |
2bf94cab | 500 | dev_dbg(dev->dev, "failed to copy data to userland\n"); |
4f046e7b TW |
501 | rets = -EFAULT; |
502 | goto out; | |
503 | } | |
504 | ||
505 | break; | |
154eb18f | 506 | |
4f046e7b | 507 | default: |
2bf94cab | 508 | dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
4f046e7b | 509 | rets = -ENOIOCTLCMD; |
ab841160 OW |
510 | } |
511 | ||
512 | out: | |
ab841160 OW |
513 | mutex_unlock(&dev->device_lock); |
514 | return rets; | |
515 | } | |
516 | ||
517 | /** | |
518 | * mei_compat_ioctl - the compat IOCTL function | |
519 | * | |
520 | * @file: pointer to file structure | |
521 | * @cmd: ioctl command | |
522 | * @data: pointer to mei message structure | |
523 | * | |
a8605ea2 | 524 | * Return: 0 on success , <0 on error |
ab841160 OW |
525 | */ |
526 | #ifdef CONFIG_COMPAT | |
527 | static long mei_compat_ioctl(struct file *file, | |
441ab50f | 528 | unsigned int cmd, unsigned long data) |
ab841160 OW |
529 | { |
530 | return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); | |
531 | } | |
532 | #endif | |
533 | ||
534 | ||
535 | /** | |
536 | * mei_poll - the poll function | |
537 | * | |
538 | * @file: pointer to file structure | |
539 | * @wait: pointer to poll_table structure | |
540 | * | |
a8605ea2 | 541 | * Return: poll mask |
ab841160 OW |
542 | */ |
543 | static unsigned int mei_poll(struct file *file, poll_table *wait) | |
544 | { | |
1d9013f0 | 545 | unsigned long req_events = poll_requested_events(wait); |
ab841160 OW |
546 | struct mei_cl *cl = file->private_data; |
547 | struct mei_device *dev; | |
548 | unsigned int mask = 0; | |
549 | ||
550 | if (WARN_ON(!cl || !cl->dev)) | |
b950ac1d | 551 | return POLLERR; |
ab841160 OW |
552 | |
553 | dev = cl->dev; | |
554 | ||
555 | mutex_lock(&dev->device_lock); | |
556 | ||
b950ac1d TW |
557 | if (!mei_cl_is_connected(cl)) { |
558 | mask = POLLERR; | |
ab841160 OW |
559 | goto out; |
560 | } | |
561 | ||
1d9013f0 TW |
562 | if (cl == &dev->iamthif_cl) { |
563 | mask = mei_amthif_poll(dev, file, wait); | |
b950ac1d TW |
564 | goto out; |
565 | } | |
566 | ||
1d9013f0 TW |
567 | if (req_events & (POLLIN | POLLRDNORM)) { |
568 | poll_wait(file, &cl->rx_wait, wait); | |
569 | ||
570 | if (!list_empty(&cl->rd_completed)) | |
571 | mask |= POLLIN | POLLRDNORM; | |
572 | else | |
573 | mei_cl_read_start(cl, 0, file); | |
574 | } | |
ab841160 OW |
575 | |
576 | out: | |
577 | mutex_unlock(&dev->device_lock); | |
578 | return mask; | |
579 | } | |
580 | ||
55c4e640 TW |
581 | /** |
582 | * fw_status_show - mei device attribute show method | |
583 | * | |
584 | * @device: device pointer | |
585 | * @attr: attribute pointer | |
586 | * @buf: char out buffer | |
587 | * | |
588 | * Return: number of the bytes printed into buf or error | |
589 | */ | |
590 | static ssize_t fw_status_show(struct device *device, | |
591 | struct device_attribute *attr, char *buf) | |
592 | { | |
593 | struct mei_device *dev = dev_get_drvdata(device); | |
594 | struct mei_fw_status fw_status; | |
595 | int err, i; | |
596 | ssize_t cnt = 0; | |
597 | ||
598 | mutex_lock(&dev->device_lock); | |
599 | err = mei_fw_status(dev, &fw_status); | |
600 | mutex_unlock(&dev->device_lock); | |
601 | if (err) { | |
602 | dev_err(device, "read fw_status error = %d\n", err); | |
603 | return err; | |
604 | } | |
605 | ||
606 | for (i = 0; i < fw_status.count; i++) | |
607 | cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", | |
608 | fw_status.status[i]); | |
609 | return cnt; | |
610 | } | |
611 | static DEVICE_ATTR_RO(fw_status); | |
612 | ||
613 | static struct attribute *mei_attrs[] = { | |
614 | &dev_attr_fw_status.attr, | |
615 | NULL | |
616 | }; | |
617 | ATTRIBUTE_GROUPS(mei); | |
618 | ||
5b881e3c OW |
619 | /* |
620 | * file operations structure will be used for mei char device. | |
621 | */ | |
622 | static const struct file_operations mei_fops = { | |
623 | .owner = THIS_MODULE, | |
624 | .read = mei_read, | |
625 | .unlocked_ioctl = mei_ioctl, | |
626 | #ifdef CONFIG_COMPAT | |
627 | .compat_ioctl = mei_compat_ioctl, | |
628 | #endif | |
629 | .open = mei_open, | |
630 | .release = mei_release, | |
631 | .write = mei_write, | |
632 | .poll = mei_poll, | |
633 | .llseek = no_llseek | |
634 | }; | |
635 | ||
f3d8e878 AU |
636 | static struct class *mei_class; |
637 | static dev_t mei_devt; | |
638 | #define MEI_MAX_DEVS MINORMASK | |
639 | static DEFINE_MUTEX(mei_minor_lock); | |
640 | static DEFINE_IDR(mei_idr); | |
641 | ||
642 | /** | |
643 | * mei_minor_get - obtain next free device minor number | |
644 | * | |
645 | * @dev: device pointer | |
646 | * | |
a8605ea2 | 647 | * Return: allocated minor, or -ENOSPC if no free minor left |
5b881e3c | 648 | */ |
f3d8e878 AU |
649 | static int mei_minor_get(struct mei_device *dev) |
650 | { | |
651 | int ret; | |
652 | ||
653 | mutex_lock(&mei_minor_lock); | |
654 | ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); | |
655 | if (ret >= 0) | |
656 | dev->minor = ret; | |
657 | else if (ret == -ENOSPC) | |
2bf94cab | 658 | dev_err(dev->dev, "too many mei devices\n"); |
5b881e3c | 659 | |
f3d8e878 AU |
660 | mutex_unlock(&mei_minor_lock); |
661 | return ret; | |
662 | } | |
30e53bb8 | 663 | |
f3d8e878 AU |
664 | /** |
665 | * mei_minor_free - mark device minor number as free | |
666 | * | |
667 | * @dev: device pointer | |
668 | */ | |
669 | static void mei_minor_free(struct mei_device *dev) | |
9a123f19 | 670 | { |
f3d8e878 AU |
671 | mutex_lock(&mei_minor_lock); |
672 | idr_remove(&mei_idr, dev->minor); | |
673 | mutex_unlock(&mei_minor_lock); | |
674 | } | |
675 | ||
676 | int mei_register(struct mei_device *dev, struct device *parent) | |
677 | { | |
678 | struct device *clsdev; /* class device */ | |
679 | int ret, devno; | |
680 | ||
681 | ret = mei_minor_get(dev); | |
682 | if (ret < 0) | |
30e53bb8 TW |
683 | return ret; |
684 | ||
f3d8e878 AU |
685 | /* Fill in the data structures */ |
686 | devno = MKDEV(MAJOR(mei_devt), dev->minor); | |
687 | cdev_init(&dev->cdev, &mei_fops); | |
688 | dev->cdev.owner = mei_fops.owner; | |
689 | ||
690 | /* Add the device */ | |
691 | ret = cdev_add(&dev->cdev, devno, 1); | |
692 | if (ret) { | |
693 | dev_err(parent, "unable to add device %d:%d\n", | |
694 | MAJOR(mei_devt), dev->minor); | |
695 | goto err_dev_add; | |
696 | } | |
697 | ||
55c4e640 TW |
698 | clsdev = device_create_with_groups(mei_class, parent, devno, |
699 | dev, mei_groups, | |
700 | "mei%d", dev->minor); | |
f3d8e878 AU |
701 | |
702 | if (IS_ERR(clsdev)) { | |
703 | dev_err(parent, "unable to create device %d:%d\n", | |
704 | MAJOR(mei_devt), dev->minor); | |
705 | ret = PTR_ERR(clsdev); | |
706 | goto err_dev_create; | |
707 | } | |
708 | ||
709 | ret = mei_dbgfs_register(dev, dev_name(clsdev)); | |
710 | if (ret) { | |
711 | dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); | |
712 | goto err_dev_dbgfs; | |
713 | } | |
30e53bb8 TW |
714 | |
715 | return 0; | |
f3d8e878 AU |
716 | |
717 | err_dev_dbgfs: | |
718 | device_destroy(mei_class, devno); | |
719 | err_dev_create: | |
720 | cdev_del(&dev->cdev); | |
721 | err_dev_add: | |
722 | mei_minor_free(dev); | |
723 | return ret; | |
5b881e3c | 724 | } |
40e0b67b | 725 | EXPORT_SYMBOL_GPL(mei_register); |
5b881e3c | 726 | |
30e53bb8 | 727 | void mei_deregister(struct mei_device *dev) |
5b881e3c | 728 | { |
f3d8e878 AU |
729 | int devno; |
730 | ||
731 | devno = dev->cdev.dev; | |
732 | cdev_del(&dev->cdev); | |
733 | ||
30e53bb8 | 734 | mei_dbgfs_deregister(dev); |
f3d8e878 AU |
735 | |
736 | device_destroy(mei_class, devno); | |
737 | ||
738 | mei_minor_free(dev); | |
5b881e3c | 739 | } |
40e0b67b | 740 | EXPORT_SYMBOL_GPL(mei_deregister); |
ab841160 | 741 | |
cf3baefb SO |
742 | static int __init mei_init(void) |
743 | { | |
f3d8e878 AU |
744 | int ret; |
745 | ||
746 | mei_class = class_create(THIS_MODULE, "mei"); | |
747 | if (IS_ERR(mei_class)) { | |
748 | pr_err("couldn't create class\n"); | |
749 | ret = PTR_ERR(mei_class); | |
750 | goto err; | |
751 | } | |
752 | ||
753 | ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); | |
754 | if (ret < 0) { | |
755 | pr_err("unable to allocate char dev region\n"); | |
756 | goto err_class; | |
757 | } | |
758 | ||
759 | ret = mei_cl_bus_init(); | |
760 | if (ret < 0) { | |
761 | pr_err("unable to initialize bus\n"); | |
762 | goto err_chrdev; | |
763 | } | |
764 | ||
765 | return 0; | |
766 | ||
767 | err_chrdev: | |
768 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); | |
769 | err_class: | |
770 | class_destroy(mei_class); | |
771 | err: | |
772 | return ret; | |
cf3baefb SO |
773 | } |
774 | ||
775 | static void __exit mei_exit(void) | |
776 | { | |
f3d8e878 AU |
777 | unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); |
778 | class_destroy(mei_class); | |
cf3baefb SO |
779 | mei_cl_bus_exit(); |
780 | } | |
781 | ||
782 | module_init(mei_init); | |
783 | module_exit(mei_exit); | |
784 | ||
40e0b67b TW |
785 | MODULE_AUTHOR("Intel Corporation"); |
786 | MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); | |
827eef51 | 787 | MODULE_LICENSE("GPL v2"); |
ab841160 | 788 |