Commit | Line | Data |
---|---|---|
e5354107 SO |
1 | /* |
2 | * Intel Management Engine Interface (Intel MEI) Linux driver | |
3 | * Copyright (c) 2012-2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/kernel.h> | |
3e833295 | 19 | #include <linux/sched.h> |
e5354107 SO |
20 | #include <linux/init.h> |
21 | #include <linux/errno.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/mutex.h> | |
24 | #include <linux/interrupt.h> | |
e5354107 SO |
25 | #include <linux/mei_cl_bus.h> |
26 | ||
27 | #include "mei_dev.h" | |
3e833295 | 28 | #include "client.h" |
e5354107 SO |
29 | |
30 | #define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver) | |
31 | #define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev) | |
32 | ||
62382997 TW |
33 | /** |
34 | * __mei_cl_send - internal client send (write) | |
35 | * | |
36 | * @cl: host client | |
37 | * @buf: buffer to send | |
38 | * @length: buffer length | |
39 | * @blocking: wait for write completion | |
40 | * | |
41 | * Return: written size bytes or < 0 on error | |
42 | */ | |
43 | ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, | |
44 | bool blocking) | |
e5354107 | 45 | { |
62382997 | 46 | struct mei_device *bus; |
6cbb097f | 47 | struct mei_cl_cb *cb; |
62382997 | 48 | ssize_t rets; |
e5354107 | 49 | |
62382997 TW |
50 | if (WARN_ON(!cl || !cl->dev)) |
51 | return -ENODEV; | |
c93b76b3 | 52 | |
62382997 | 53 | bus = cl->dev; |
e5354107 | 54 | |
62382997 | 55 | mutex_lock(&bus->device_lock); |
15c13dfc AU |
56 | if (bus->dev_state != MEI_DEV_ENABLED) { |
57 | rets = -ENODEV; | |
58 | goto out; | |
59 | } | |
60 | ||
62382997 TW |
61 | if (!mei_cl_is_connected(cl)) { |
62 | rets = -ENODEV; | |
63 | goto out; | |
64 | } | |
e5354107 | 65 | |
62382997 TW |
66 | /* Check if we have an ME client device */ |
67 | if (!mei_me_cl_is_active(cl->me_cl)) { | |
68 | rets = -ENOTTY; | |
69 | goto out; | |
70 | } | |
c93b76b3 | 71 | |
62382997 TW |
72 | if (length > mei_cl_mtu(cl)) { |
73 | rets = -EFBIG; | |
74 | goto out; | |
75 | } | |
e5354107 | 76 | |
62382997 TW |
77 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL); |
78 | if (!cb) { | |
79 | rets = -ENOMEM; | |
80 | goto out; | |
e5354107 SO |
81 | } |
82 | ||
62382997 TW |
83 | memcpy(cb->buf.data, buf, length); |
84 | ||
85 | rets = mei_cl_write(cl, cb, blocking); | |
86 | ||
87 | out: | |
88 | mutex_unlock(&bus->device_lock); | |
62382997 TW |
89 | |
90 | return rets; | |
e5354107 SO |
91 | } |
92 | ||
62382997 TW |
93 | /** |
94 | * __mei_cl_recv - internal client receive (read) | |
95 | * | |
96 | * @cl: host client | |
df7f5447 | 97 | * @buf: buffer to receive |
62382997 TW |
98 | * @length: buffer length |
99 | * | |
100 | * Return: read size in bytes of < 0 on error | |
101 | */ | |
102 | ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length) | |
e5354107 | 103 | { |
62382997 TW |
104 | struct mei_device *bus; |
105 | struct mei_cl_cb *cb; | |
106 | size_t r_length; | |
107 | ssize_t rets; | |
e5354107 | 108 | |
62382997 | 109 | if (WARN_ON(!cl || !cl->dev)) |
e5354107 SO |
110 | return -ENODEV; |
111 | ||
62382997 | 112 | bus = cl->dev; |
e5354107 | 113 | |
62382997 | 114 | mutex_lock(&bus->device_lock); |
15c13dfc AU |
115 | if (bus->dev_state != MEI_DEV_ENABLED) { |
116 | rets = -ENODEV; | |
117 | goto out; | |
118 | } | |
e5354107 | 119 | |
62382997 TW |
120 | cb = mei_cl_read_cb(cl, NULL); |
121 | if (cb) | |
122 | goto copy; | |
e5354107 | 123 | |
62382997 TW |
124 | rets = mei_cl_read_start(cl, length, NULL); |
125 | if (rets && rets != -EBUSY) | |
126 | goto out; | |
e5354107 | 127 | |
62382997 TW |
128 | /* wait on event only if there is no other waiter */ |
129 | if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) { | |
e5354107 | 130 | |
62382997 | 131 | mutex_unlock(&bus->device_lock); |
3e833295 | 132 | |
62382997 TW |
133 | if (wait_event_interruptible(cl->rx_wait, |
134 | (!list_empty(&cl->rd_completed)) || | |
135 | (!mei_cl_is_connected(cl)))) { | |
e5354107 | 136 | |
62382997 TW |
137 | if (signal_pending(current)) |
138 | return -EINTR; | |
139 | return -ERESTARTSYS; | |
140 | } | |
141 | ||
142 | mutex_lock(&bus->device_lock); | |
143 | ||
144 | if (!mei_cl_is_connected(cl)) { | |
145 | rets = -EBUSY; | |
146 | goto out; | |
147 | } | |
e5354107 SO |
148 | } |
149 | ||
62382997 TW |
150 | cb = mei_cl_read_cb(cl, NULL); |
151 | if (!cb) { | |
152 | rets = 0; | |
153 | goto out; | |
154 | } | |
e5354107 | 155 | |
62382997 TW |
156 | copy: |
157 | if (cb->status) { | |
158 | rets = cb->status; | |
159 | goto free; | |
160 | } | |
007d64eb | 161 | |
62382997 TW |
162 | r_length = min_t(size_t, length, cb->buf_idx); |
163 | memcpy(buf, cb->buf.data, r_length); | |
164 | rets = r_length; | |
007d64eb | 165 | |
62382997 TW |
166 | free: |
167 | mei_io_cb_free(cb); | |
168 | out: | |
169 | mutex_unlock(&bus->device_lock); | |
170 | ||
171 | return rets; | |
007d64eb | 172 | } |
007d64eb | 173 | |
62382997 | 174 | /** |
d49dc5e7 | 175 | * mei_cldev_send - me device send (write) |
62382997 TW |
176 | * |
177 | * @cldev: me client device | |
178 | * @buf: buffer to send | |
179 | * @length: buffer length | |
180 | * | |
181 | * Return: written size in bytes or < 0 on error | |
182 | */ | |
d49dc5e7 | 183 | ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length) |
007d64eb | 184 | { |
62382997 | 185 | struct mei_cl *cl = cldev->cl; |
007d64eb | 186 | |
62382997 TW |
187 | if (cl == NULL) |
188 | return -ENODEV; | |
007d64eb | 189 | |
62382997 | 190 | return __mei_cl_send(cl, buf, length, 1); |
007d64eb | 191 | } |
d49dc5e7 | 192 | EXPORT_SYMBOL_GPL(mei_cldev_send); |
007d64eb | 193 | |
62382997 | 194 | /** |
d49dc5e7 | 195 | * mei_cldev_recv - client receive (read) |
62382997 TW |
196 | * |
197 | * @cldev: me client device | |
df7f5447 | 198 | * @buf: buffer to receive |
62382997 TW |
199 | * @length: buffer length |
200 | * | |
201 | * Return: read size in bytes of < 0 on error | |
202 | */ | |
d49dc5e7 | 203 | ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length) |
e5354107 | 204 | { |
62382997 | 205 | struct mei_cl *cl = cldev->cl; |
e5354107 | 206 | |
62382997 TW |
207 | if (cl == NULL) |
208 | return -ENODEV; | |
e5354107 | 209 | |
62382997 | 210 | return __mei_cl_recv(cl, buf, length); |
e5354107 | 211 | } |
d49dc5e7 | 212 | EXPORT_SYMBOL_GPL(mei_cldev_recv); |
e5354107 | 213 | |
62382997 | 214 | /** |
d49dc5e7 | 215 | * mei_cl_bus_event_work - dispatch rx event for a bus device |
62382997 TW |
216 | * and schedule new work |
217 | * | |
218 | * @work: work | |
219 | */ | |
d49dc5e7 | 220 | static void mei_cl_bus_event_work(struct work_struct *work) |
e5354107 | 221 | { |
62382997 | 222 | struct mei_cl_device *cldev; |
c93b76b3 | 223 | |
62382997 | 224 | cldev = container_of(work, struct mei_cl_device, event_work); |
007d64eb | 225 | |
62382997 TW |
226 | if (cldev->event_cb) |
227 | cldev->event_cb(cldev, cldev->events, cldev->event_context); | |
007d64eb | 228 | |
62382997 | 229 | cldev->events = 0; |
e5354107 | 230 | |
62382997 | 231 | /* Prepare for the next read */ |
bb2ef9c3 AU |
232 | if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) |
233 | mei_cl_read_start(cldev->cl, 0, NULL); | |
234 | } | |
235 | ||
236 | /** | |
237 | * mei_cl_bus_notify_event - schedule notify cb on bus client | |
238 | * | |
239 | * @cl: host client | |
850f8940 TW |
240 | * |
241 | * Return: true if event was scheduled | |
242 | * false if the client is not waiting for event | |
bb2ef9c3 | 243 | */ |
850f8940 | 244 | bool mei_cl_bus_notify_event(struct mei_cl *cl) |
bb2ef9c3 AU |
245 | { |
246 | struct mei_cl_device *cldev = cl->cldev; | |
247 | ||
248 | if (!cldev || !cldev->event_cb) | |
850f8940 | 249 | return false; |
bb2ef9c3 AU |
250 | |
251 | if (!(cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF))) | |
850f8940 | 252 | return false; |
bb2ef9c3 AU |
253 | |
254 | if (!cl->notify_ev) | |
850f8940 | 255 | return false; |
bb2ef9c3 AU |
256 | |
257 | set_bit(MEI_CL_EVENT_NOTIF, &cldev->events); | |
258 | ||
259 | schedule_work(&cldev->event_work); | |
260 | ||
261 | cl->notify_ev = false; | |
850f8940 TW |
262 | |
263 | return true; | |
e5354107 SO |
264 | } |
265 | ||
62382997 | 266 | /** |
a1f9ae2b | 267 | * mei_cl_bus_rx_event - schedule rx event |
62382997 TW |
268 | * |
269 | * @cl: host client | |
a1f9ae2b TW |
270 | * |
271 | * Return: true if event was scheduled | |
272 | * false if the client is not waiting for event | |
62382997 | 273 | */ |
a1f9ae2b | 274 | bool mei_cl_bus_rx_event(struct mei_cl *cl) |
e5354107 | 275 | { |
62382997 | 276 | struct mei_cl_device *cldev = cl->cldev; |
d49ed64a | 277 | |
62382997 | 278 | if (!cldev || !cldev->event_cb) |
a1f9ae2b | 279 | return false; |
d49ed64a | 280 | |
bb2ef9c3 | 281 | if (!(cldev->events_mask & BIT(MEI_CL_EVENT_RX))) |
a1f9ae2b | 282 | return false; |
bb2ef9c3 | 283 | |
62382997 | 284 | set_bit(MEI_CL_EVENT_RX, &cldev->events); |
a7b71bc0 | 285 | |
62382997 | 286 | schedule_work(&cldev->event_work); |
a1f9ae2b TW |
287 | |
288 | return true; | |
a7b71bc0 | 289 | } |
d49ed64a | 290 | |
62382997 | 291 | /** |
d49dc5e7 | 292 | * mei_cldev_register_event_cb - register event callback |
62382997 TW |
293 | * |
294 | * @cldev: me client devices | |
295 | * @event_cb: callback function | |
bb2ef9c3 | 296 | * @events_mask: requested events bitmask |
62382997 TW |
297 | * @context: driver context data |
298 | * | |
299 | * Return: 0 on success | |
300 | * -EALREADY if an callback is already registered | |
301 | * <0 on other errors | |
302 | */ | |
d49dc5e7 TW |
303 | int mei_cldev_register_event_cb(struct mei_cl_device *cldev, |
304 | unsigned long events_mask, | |
305 | mei_cldev_event_cb_t event_cb, void *context) | |
e5354107 | 306 | { |
48168f45 TW |
307 | int ret; |
308 | ||
62382997 TW |
309 | if (cldev->event_cb) |
310 | return -EALREADY; | |
e5354107 | 311 | |
62382997 | 312 | cldev->events = 0; |
bb2ef9c3 | 313 | cldev->events_mask = events_mask; |
62382997 TW |
314 | cldev->event_cb = event_cb; |
315 | cldev->event_context = context; | |
d49dc5e7 | 316 | INIT_WORK(&cldev->event_work, mei_cl_bus_event_work); |
a7b71bc0 | 317 | |
bb2ef9c3 AU |
318 | if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) { |
319 | ret = mei_cl_read_start(cldev->cl, 0, NULL); | |
320 | if (ret && ret != -EBUSY) | |
321 | return ret; | |
322 | } | |
323 | ||
324 | if (cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)) { | |
325 | mutex_lock(&cldev->cl->dev->device_lock); | |
326 | ret = mei_cl_notify_request(cldev->cl, NULL, event_cb ? 1 : 0); | |
327 | mutex_unlock(&cldev->cl->dev->device_lock); | |
328 | if (ret) | |
329 | return ret; | |
330 | } | |
e5354107 | 331 | |
62382997 TW |
332 | return 0; |
333 | } | |
d49dc5e7 | 334 | EXPORT_SYMBOL_GPL(mei_cldev_register_event_cb); |
e5354107 | 335 | |
62382997 | 336 | /** |
d49dc5e7 | 337 | * mei_cldev_get_drvdata - driver data getter |
62382997 TW |
338 | * |
339 | * @cldev: mei client device | |
340 | * | |
341 | * Return: driver private data | |
342 | */ | |
d49dc5e7 | 343 | void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev) |
62382997 TW |
344 | { |
345 | return dev_get_drvdata(&cldev->dev); | |
e5354107 | 346 | } |
d49dc5e7 | 347 | EXPORT_SYMBOL_GPL(mei_cldev_get_drvdata); |
e5354107 | 348 | |
62382997 | 349 | /** |
d49dc5e7 | 350 | * mei_cldev_set_drvdata - driver data setter |
62382997 TW |
351 | * |
352 | * @cldev: mei client device | |
353 | * @data: data to store | |
354 | */ | |
d49dc5e7 | 355 | void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data) |
e5354107 | 356 | { |
62382997 | 357 | dev_set_drvdata(&cldev->dev, data); |
e5354107 | 358 | } |
d49dc5e7 | 359 | EXPORT_SYMBOL_GPL(mei_cldev_set_drvdata); |
333e4ee0 | 360 | |
baeacd03 TW |
361 | /** |
362 | * mei_cldev_uuid - return uuid of the underlying me client | |
363 | * | |
364 | * @cldev: mei client device | |
365 | * | |
366 | * Return: me client uuid | |
367 | */ | |
368 | const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev) | |
369 | { | |
370 | return mei_me_cl_uuid(cldev->me_cl); | |
371 | } | |
372 | EXPORT_SYMBOL_GPL(mei_cldev_uuid); | |
373 | ||
374 | /** | |
375 | * mei_cldev_ver - return protocol version of the underlying me client | |
376 | * | |
377 | * @cldev: mei client device | |
378 | * | |
379 | * Return: me client protocol version | |
380 | */ | |
381 | u8 mei_cldev_ver(const struct mei_cl_device *cldev) | |
382 | { | |
383 | return mei_me_cl_ver(cldev->me_cl); | |
384 | } | |
385 | EXPORT_SYMBOL_GPL(mei_cldev_ver); | |
386 | ||
01a14ede TW |
387 | /** |
388 | * mei_cldev_enabled - check whether the device is enabled | |
389 | * | |
390 | * @cldev: mei client device | |
391 | * | |
392 | * Return: true if me client is initialized and connected | |
393 | */ | |
394 | bool mei_cldev_enabled(struct mei_cl_device *cldev) | |
395 | { | |
396 | return cldev->cl && mei_cl_is_connected(cldev->cl); | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(mei_cldev_enabled); | |
399 | ||
62382997 | 400 | /** |
d49dc5e7 | 401 | * mei_cldev_enable_device - enable me client device |
62382997 TW |
402 | * create connection with me client |
403 | * | |
404 | * @cldev: me client device | |
405 | * | |
406 | * Return: 0 on success and < 0 on error | |
407 | */ | |
d49dc5e7 | 408 | int mei_cldev_enable(struct mei_cl_device *cldev) |
333e4ee0 | 409 | { |
6009595a TW |
410 | struct mei_device *bus = cldev->bus; |
411 | struct mei_cl *cl; | |
412 | int ret; | |
333e4ee0 | 413 | |
6009595a | 414 | cl = cldev->cl; |
333e4ee0 | 415 | |
6009595a TW |
416 | if (!cl) { |
417 | mutex_lock(&bus->device_lock); | |
7851e008 | 418 | cl = mei_cl_alloc_linked(bus); |
6009595a TW |
419 | mutex_unlock(&bus->device_lock); |
420 | if (IS_ERR(cl)) | |
421 | return PTR_ERR(cl); | |
422 | /* update pointers */ | |
423 | cldev->cl = cl; | |
424 | cl->cldev = cldev; | |
425 | } | |
333e4ee0 | 426 | |
62382997 | 427 | mutex_lock(&bus->device_lock); |
62382997 | 428 | if (mei_cl_is_connected(cl)) { |
6009595a TW |
429 | ret = 0; |
430 | goto out; | |
62382997 | 431 | } |
333e4ee0 | 432 | |
6009595a TW |
433 | if (!mei_me_cl_is_active(cldev->me_cl)) { |
434 | dev_err(&cldev->dev, "me client is not active\n"); | |
435 | ret = -ENOTTY; | |
436 | goto out; | |
62382997 TW |
437 | } |
438 | ||
6009595a TW |
439 | ret = mei_cl_connect(cl, cldev->me_cl, NULL); |
440 | if (ret < 0) | |
441 | dev_err(&cldev->dev, "cannot connect\n"); | |
442 | ||
443 | out: | |
62382997 TW |
444 | mutex_unlock(&bus->device_lock); |
445 | ||
6009595a | 446 | return ret; |
333e4ee0 | 447 | } |
d49dc5e7 | 448 | EXPORT_SYMBOL_GPL(mei_cldev_enable); |
3e833295 | 449 | |
62382997 | 450 | /** |
d49dc5e7 | 451 | * mei_cldev_disable - disable me client device |
62382997 TW |
452 | * disconnect form the me client |
453 | * | |
454 | * @cldev: me client device | |
455 | * | |
456 | * Return: 0 on success and < 0 on error | |
457 | */ | |
d49dc5e7 | 458 | int mei_cldev_disable(struct mei_cl_device *cldev) |
3e833295 | 459 | { |
b37719c3 | 460 | struct mei_device *bus; |
6009595a TW |
461 | struct mei_cl *cl; |
462 | int err; | |
3e833295 | 463 | |
6009595a | 464 | if (!cldev || !cldev->cl) |
3e833295 SO |
465 | return -ENODEV; |
466 | ||
6009595a TW |
467 | cl = cldev->cl; |
468 | ||
469 | bus = cldev->bus; | |
4234a6de | 470 | |
62382997 | 471 | cldev->event_cb = NULL; |
3e833295 | 472 | |
62382997 | 473 | mutex_lock(&bus->device_lock); |
4234a6de | 474 | |
62382997 TW |
475 | if (!mei_cl_is_connected(cl)) { |
476 | dev_err(bus->dev, "Already disconnected"); | |
477 | err = 0; | |
79563db9 TW |
478 | goto out; |
479 | } | |
4234a6de | 480 | |
62382997 | 481 | err = mei_cl_disconnect(cl); |
6009595a | 482 | if (err < 0) |
62382997 | 483 | dev_err(bus->dev, "Could not disconnect from the ME client"); |
3e833295 | 484 | |
6009595a | 485 | out: |
62382997 TW |
486 | /* Flush queues and remove any pending read */ |
487 | mei_cl_flush_queues(cl, NULL); | |
6009595a TW |
488 | mei_cl_unlink(cl); |
489 | ||
490 | kfree(cl); | |
491 | cldev->cl = NULL; | |
3e833295 | 492 | |
b37719c3 | 493 | mutex_unlock(&bus->device_lock); |
62382997 | 494 | return err; |
3e833295 | 495 | } |
d49dc5e7 | 496 | EXPORT_SYMBOL_GPL(mei_cldev_disable); |
3e833295 | 497 | |
688a9cce TW |
498 | /** |
499 | * mei_cl_device_find - find matching entry in the driver id table | |
500 | * | |
501 | * @cldev: me client device | |
502 | * @cldrv: me client driver | |
503 | * | |
504 | * Return: id on success; NULL if no id is matching | |
505 | */ | |
506 | static const | |
507 | struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev, | |
508 | struct mei_cl_driver *cldrv) | |
3e833295 | 509 | { |
62382997 TW |
510 | const struct mei_cl_device_id *id; |
511 | const uuid_le *uuid; | |
b26864ca TW |
512 | u8 version; |
513 | bool match; | |
3e833295 | 514 | |
62382997 | 515 | uuid = mei_me_cl_uuid(cldev->me_cl); |
b26864ca | 516 | version = mei_me_cl_ver(cldev->me_cl); |
3e833295 | 517 | |
62382997 | 518 | id = cldrv->id_table; |
62382997 | 519 | while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) { |
62382997 | 520 | if (!uuid_le_cmp(*uuid, id->uuid)) { |
b26864ca | 521 | match = true; |
688a9cce | 522 | |
b26864ca TW |
523 | if (cldev->name[0]) |
524 | if (strncmp(cldev->name, id->name, | |
525 | sizeof(id->name))) | |
526 | match = false; | |
688a9cce | 527 | |
b26864ca TW |
528 | if (id->version != MEI_CL_VERSION_ANY) |
529 | if (id->version != version) | |
530 | match = false; | |
531 | if (match) | |
688a9cce | 532 | return id; |
62382997 | 533 | } |
e2b31644 | 534 | |
62382997 TW |
535 | id++; |
536 | } | |
3e833295 | 537 | |
688a9cce TW |
538 | return NULL; |
539 | } | |
540 | ||
541 | /** | |
542 | * mei_cl_device_match - device match function | |
543 | * | |
544 | * @dev: device | |
545 | * @drv: driver | |
546 | * | |
547 | * Return: 1 if matching device was found 0 otherwise | |
548 | */ | |
549 | static int mei_cl_device_match(struct device *dev, struct device_driver *drv) | |
550 | { | |
551 | struct mei_cl_device *cldev = to_mei_cl_device(dev); | |
552 | struct mei_cl_driver *cldrv = to_mei_cl_driver(drv); | |
553 | const struct mei_cl_device_id *found_id; | |
554 | ||
555 | if (!cldev) | |
556 | return 0; | |
557 | ||
71ce7891 TW |
558 | if (!cldev->do_match) |
559 | return 0; | |
560 | ||
688a9cce TW |
561 | if (!cldrv || !cldrv->id_table) |
562 | return 0; | |
563 | ||
564 | found_id = mei_cl_device_find(cldev, cldrv); | |
565 | if (found_id) | |
566 | return 1; | |
567 | ||
62382997 TW |
568 | return 0; |
569 | } | |
e2b31644 | 570 | |
feb8cd0f TW |
571 | /** |
572 | * mei_cl_device_probe - bus probe function | |
573 | * | |
574 | * @dev: device | |
575 | * | |
576 | * Return: 0 on success; < 0 otherwise | |
577 | */ | |
62382997 TW |
578 | static int mei_cl_device_probe(struct device *dev) |
579 | { | |
feb8cd0f | 580 | struct mei_cl_device *cldev; |
62382997 | 581 | struct mei_cl_driver *cldrv; |
feb8cd0f TW |
582 | const struct mei_cl_device_id *id; |
583 | ||
584 | cldev = to_mei_cl_device(dev); | |
585 | cldrv = to_mei_cl_driver(dev->driver); | |
3e833295 | 586 | |
62382997 TW |
587 | if (!cldev) |
588 | return 0; | |
3e833295 | 589 | |
62382997 TW |
590 | if (!cldrv || !cldrv->probe) |
591 | return -ENODEV; | |
592 | ||
feb8cd0f TW |
593 | id = mei_cl_device_find(cldev, cldrv); |
594 | if (!id) | |
595 | return -ENODEV; | |
62382997 | 596 | |
feb8cd0f | 597 | __module_get(THIS_MODULE); |
62382997 | 598 | |
feb8cd0f | 599 | return cldrv->probe(cldev, id); |
62382997 | 600 | } |
3e833295 | 601 | |
feb8cd0f TW |
602 | /** |
603 | * mei_cl_device_remove - remove device from the bus | |
604 | * | |
605 | * @dev: device | |
606 | * | |
607 | * Return: 0 on success; < 0 otherwise | |
608 | */ | |
62382997 TW |
609 | static int mei_cl_device_remove(struct device *dev) |
610 | { | |
611 | struct mei_cl_device *cldev = to_mei_cl_device(dev); | |
612 | struct mei_cl_driver *cldrv; | |
feb8cd0f | 613 | int ret = 0; |
3e833295 | 614 | |
62382997 TW |
615 | if (!cldev || !dev->driver) |
616 | return 0; | |
617 | ||
618 | if (cldev->event_cb) { | |
619 | cldev->event_cb = NULL; | |
620 | cancel_work_sync(&cldev->event_work); | |
3d33ff24 TW |
621 | } |
622 | ||
62382997 | 623 | cldrv = to_mei_cl_driver(dev->driver); |
feb8cd0f TW |
624 | if (cldrv->remove) |
625 | ret = cldrv->remove(cldev); | |
3e833295 | 626 | |
feb8cd0f TW |
627 | module_put(THIS_MODULE); |
628 | dev->driver = NULL; | |
629 | return ret; | |
3e833295 | 630 | |
3e833295 SO |
631 | } |
632 | ||
62382997 TW |
633 | static ssize_t name_show(struct device *dev, struct device_attribute *a, |
634 | char *buf) | |
3e833295 | 635 | { |
62382997 TW |
636 | struct mei_cl_device *cldev = to_mei_cl_device(dev); |
637 | size_t len; | |
3e833295 | 638 | |
62382997 | 639 | len = snprintf(buf, PAGE_SIZE, "%s", cldev->name); |
3e833295 | 640 | |
62382997 | 641 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; |
3e833295 | 642 | } |
62382997 | 643 | static DEVICE_ATTR_RO(name); |
3e833295 | 644 | |
62382997 TW |
645 | static ssize_t uuid_show(struct device *dev, struct device_attribute *a, |
646 | char *buf) | |
3e833295 | 647 | { |
62382997 TW |
648 | struct mei_cl_device *cldev = to_mei_cl_device(dev); |
649 | const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl); | |
650 | size_t len; | |
3e833295 | 651 | |
62382997 | 652 | len = snprintf(buf, PAGE_SIZE, "%pUl", uuid); |
3e833295 | 653 | |
62382997 | 654 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; |
3e833295 | 655 | } |
62382997 | 656 | static DEVICE_ATTR_RO(uuid); |
3e833295 | 657 | |
40b7320e TW |
658 | static ssize_t version_show(struct device *dev, struct device_attribute *a, |
659 | char *buf) | |
660 | { | |
661 | struct mei_cl_device *cldev = to_mei_cl_device(dev); | |
662 | u8 version = mei_me_cl_ver(cldev->me_cl); | |
663 | size_t len; | |
664 | ||
665 | len = snprintf(buf, PAGE_SIZE, "%02X", version); | |
666 | ||
667 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; | |
668 | } | |
669 | static DEVICE_ATTR_RO(version); | |
670 | ||
62382997 TW |
671 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
672 | char *buf) | |
3e833295 | 673 | { |
62382997 TW |
674 | struct mei_cl_device *cldev = to_mei_cl_device(dev); |
675 | const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl); | |
676 | size_t len; | |
3e833295 | 677 | |
59796edc | 678 | len = snprintf(buf, PAGE_SIZE, "mei:%s:%pUl:", cldev->name, uuid); |
62382997 | 679 | return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; |
3e833295 | 680 | } |
62382997 | 681 | static DEVICE_ATTR_RO(modalias); |
3e833295 | 682 | |
d49dc5e7 | 683 | static struct attribute *mei_cldev_attrs[] = { |
62382997 TW |
684 | &dev_attr_name.attr, |
685 | &dev_attr_uuid.attr, | |
40b7320e | 686 | &dev_attr_version.attr, |
62382997 TW |
687 | &dev_attr_modalias.attr, |
688 | NULL, | |
689 | }; | |
d49dc5e7 | 690 | ATTRIBUTE_GROUPS(mei_cldev); |
62382997 | 691 | |
38d3c00d TW |
692 | /** |
693 | * mei_cl_device_uevent - me client bus uevent handler | |
694 | * | |
695 | * @dev: device | |
696 | * @env: uevent kobject | |
697 | * | |
698 | * Return: 0 on success -ENOMEM on when add_uevent_var fails | |
699 | */ | |
700 | static int mei_cl_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
3e833295 | 701 | { |
62382997 TW |
702 | struct mei_cl_device *cldev = to_mei_cl_device(dev); |
703 | const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl); | |
40b7320e TW |
704 | u8 version = mei_me_cl_ver(cldev->me_cl); |
705 | ||
706 | if (add_uevent_var(env, "MEI_CL_VERSION=%d", version)) | |
707 | return -ENOMEM; | |
3e833295 | 708 | |
62382997 TW |
709 | if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid)) |
710 | return -ENOMEM; | |
3e833295 | 711 | |
62382997 TW |
712 | if (add_uevent_var(env, "MEI_CL_NAME=%s", cldev->name)) |
713 | return -ENOMEM; | |
714 | ||
b26864ca TW |
715 | if (add_uevent_var(env, "MODALIAS=mei:%s:%pUl:%02X:", |
716 | cldev->name, uuid, version)) | |
62382997 | 717 | return -ENOMEM; |
3e833295 SO |
718 | |
719 | return 0; | |
720 | } | |
cf3baefb | 721 | |
62382997 TW |
722 | static struct bus_type mei_cl_bus_type = { |
723 | .name = "mei", | |
d49dc5e7 | 724 | .dev_groups = mei_cldev_groups, |
62382997 TW |
725 | .match = mei_cl_device_match, |
726 | .probe = mei_cl_device_probe, | |
727 | .remove = mei_cl_device_remove, | |
38d3c00d | 728 | .uevent = mei_cl_device_uevent, |
62382997 TW |
729 | }; |
730 | ||
512f64d9 TW |
731 | static struct mei_device *mei_dev_bus_get(struct mei_device *bus) |
732 | { | |
733 | if (bus) | |
734 | get_device(bus->dev); | |
735 | ||
736 | return bus; | |
737 | } | |
738 | ||
739 | static void mei_dev_bus_put(struct mei_device *bus) | |
740 | { | |
741 | if (bus) | |
742 | put_device(bus->dev); | |
743 | } | |
744 | ||
ae48d74d | 745 | static void mei_cl_bus_dev_release(struct device *dev) |
aa6aef21 | 746 | { |
62382997 TW |
747 | struct mei_cl_device *cldev = to_mei_cl_device(dev); |
748 | ||
749 | if (!cldev) | |
750 | return; | |
751 | ||
752 | mei_me_cl_put(cldev->me_cl); | |
512f64d9 | 753 | mei_dev_bus_put(cldev->bus); |
62382997 | 754 | kfree(cldev); |
aa6aef21 | 755 | } |
aa6aef21 | 756 | |
62382997 | 757 | static struct device_type mei_cl_device_type = { |
ae48d74d | 758 | .release = mei_cl_bus_dev_release, |
62382997 TW |
759 | }; |
760 | ||
213dd193 TW |
761 | /** |
762 | * mei_cl_bus_set_name - set device name for me client device | |
763 | * | |
764 | * @cldev: me client device | |
765 | */ | |
766 | static inline void mei_cl_bus_set_name(struct mei_cl_device *cldev) | |
767 | { | |
768 | dev_set_name(&cldev->dev, "mei:%s:%pUl:%02X", | |
769 | cldev->name, | |
770 | mei_me_cl_uuid(cldev->me_cl), | |
771 | mei_me_cl_ver(cldev->me_cl)); | |
772 | } | |
773 | ||
71ce7891 | 774 | /** |
ae48d74d | 775 | * mei_cl_bus_dev_alloc - initialize and allocate mei client device |
71ce7891 TW |
776 | * |
777 | * @bus: mei device | |
778 | * @me_cl: me client | |
779 | * | |
780 | * Return: allocated device structur or NULL on allocation failure | |
781 | */ | |
ae48d74d TW |
782 | static struct mei_cl_device *mei_cl_bus_dev_alloc(struct mei_device *bus, |
783 | struct mei_me_client *me_cl) | |
71ce7891 TW |
784 | { |
785 | struct mei_cl_device *cldev; | |
786 | ||
787 | cldev = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL); | |
788 | if (!cldev) | |
789 | return NULL; | |
790 | ||
791 | device_initialize(&cldev->dev); | |
792 | cldev->dev.parent = bus->dev; | |
793 | cldev->dev.bus = &mei_cl_bus_type; | |
794 | cldev->dev.type = &mei_cl_device_type; | |
795 | cldev->bus = mei_dev_bus_get(bus); | |
796 | cldev->me_cl = mei_me_cl_get(me_cl); | |
213dd193 | 797 | mei_cl_bus_set_name(cldev); |
71ce7891 TW |
798 | cldev->is_added = 0; |
799 | INIT_LIST_HEAD(&cldev->bus_list); | |
800 | ||
801 | return cldev; | |
802 | } | |
803 | ||
804 | /** | |
805 | * mei_cl_dev_setup - setup me client device | |
806 | * run fix up routines and set the device name | |
807 | * | |
808 | * @bus: mei device | |
809 | * @cldev: me client device | |
810 | * | |
811 | * Return: true if the device is eligible for enumeration | |
812 | */ | |
ae48d74d TW |
813 | static bool mei_cl_bus_dev_setup(struct mei_device *bus, |
814 | struct mei_cl_device *cldev) | |
71ce7891 TW |
815 | { |
816 | cldev->do_match = 1; | |
ae48d74d | 817 | mei_cl_bus_dev_fixup(cldev); |
71ce7891 | 818 | |
213dd193 | 819 | /* the device name can change during fix up */ |
71ce7891 | 820 | if (cldev->do_match) |
213dd193 | 821 | mei_cl_bus_set_name(cldev); |
71ce7891 TW |
822 | |
823 | return cldev->do_match == 1; | |
824 | } | |
825 | ||
826 | /** | |
827 | * mei_cl_bus_dev_add - add me client devices | |
828 | * | |
829 | * @cldev: me client device | |
830 | * | |
831 | * Return: 0 on success; < 0 on failre | |
832 | */ | |
833 | static int mei_cl_bus_dev_add(struct mei_cl_device *cldev) | |
834 | { | |
835 | int ret; | |
836 | ||
b26864ca TW |
837 | dev_dbg(cldev->bus->dev, "adding %pUL:%02X\n", |
838 | mei_me_cl_uuid(cldev->me_cl), | |
839 | mei_me_cl_ver(cldev->me_cl)); | |
71ce7891 TW |
840 | ret = device_add(&cldev->dev); |
841 | if (!ret) | |
842 | cldev->is_added = 1; | |
843 | ||
844 | return ret; | |
845 | } | |
846 | ||
6009595a TW |
847 | /** |
848 | * mei_cl_bus_dev_stop - stop the driver | |
849 | * | |
850 | * @cldev: me client device | |
851 | */ | |
852 | static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev) | |
853 | { | |
854 | if (cldev->is_added) | |
855 | device_release_driver(&cldev->dev); | |
856 | } | |
857 | ||
858 | /** | |
859 | * mei_cl_bus_dev_destroy - destroy me client devices object | |
860 | * | |
861 | * @cldev: me client device | |
2da55cfd TW |
862 | * |
863 | * Locking: called under "dev->cl_bus_lock" lock | |
6009595a TW |
864 | */ |
865 | static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev) | |
866 | { | |
2da55cfd TW |
867 | |
868 | WARN_ON(!mutex_is_locked(&cldev->bus->cl_bus_lock)); | |
869 | ||
6009595a TW |
870 | if (!cldev->is_added) |
871 | return; | |
872 | ||
873 | device_del(&cldev->dev); | |
874 | ||
6009595a | 875 | list_del_init(&cldev->bus_list); |
6009595a TW |
876 | |
877 | cldev->is_added = 0; | |
878 | put_device(&cldev->dev); | |
879 | } | |
880 | ||
881 | /** | |
882 | * mei_cl_bus_remove_device - remove a devices form the bus | |
883 | * | |
884 | * @cldev: me client device | |
885 | */ | |
886 | static void mei_cl_bus_remove_device(struct mei_cl_device *cldev) | |
887 | { | |
888 | mei_cl_bus_dev_stop(cldev); | |
889 | mei_cl_bus_dev_destroy(cldev); | |
890 | } | |
891 | ||
892 | /** | |
893 | * mei_cl_bus_remove_devices - remove all devices form the bus | |
894 | * | |
895 | * @bus: mei device | |
896 | */ | |
897 | void mei_cl_bus_remove_devices(struct mei_device *bus) | |
898 | { | |
899 | struct mei_cl_device *cldev, *next; | |
900 | ||
2da55cfd | 901 | mutex_lock(&bus->cl_bus_lock); |
6009595a TW |
902 | list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list) |
903 | mei_cl_bus_remove_device(cldev); | |
2da55cfd | 904 | mutex_unlock(&bus->cl_bus_lock); |
6009595a TW |
905 | } |
906 | ||
907 | ||
908 | /** | |
ae48d74d | 909 | * mei_cl_bus_dev_init - allocate and initializes an mei client devices |
6009595a TW |
910 | * based on me client |
911 | * | |
912 | * @bus: mei device | |
913 | * @me_cl: me client | |
2da55cfd TW |
914 | * |
915 | * Locking: called under "dev->cl_bus_lock" lock | |
6009595a | 916 | */ |
ae48d74d TW |
917 | static void mei_cl_bus_dev_init(struct mei_device *bus, |
918 | struct mei_me_client *me_cl) | |
e46980a1 | 919 | { |
62382997 | 920 | struct mei_cl_device *cldev; |
6009595a | 921 | |
2da55cfd TW |
922 | WARN_ON(!mutex_is_locked(&bus->cl_bus_lock)); |
923 | ||
6009595a TW |
924 | dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl)); |
925 | ||
926 | if (me_cl->bus_added) | |
927 | return; | |
e46980a1 | 928 | |
ae48d74d | 929 | cldev = mei_cl_bus_dev_alloc(bus, me_cl); |
62382997 | 930 | if (!cldev) |
6009595a | 931 | return; |
e46980a1 | 932 | |
6009595a TW |
933 | me_cl->bus_added = true; |
934 | list_add_tail(&cldev->bus_list, &bus->device_list); | |
0c53357c | 935 | |
6009595a | 936 | } |
e46980a1 | 937 | |
6009595a TW |
938 | /** |
939 | * mei_cl_bus_rescan - scan me clients list and add create | |
940 | * devices for eligible clients | |
941 | * | |
942 | * @bus: mei device | |
943 | */ | |
944 | void mei_cl_bus_rescan(struct mei_device *bus) | |
945 | { | |
946 | struct mei_cl_device *cldev, *n; | |
947 | struct mei_me_client *me_cl; | |
e46980a1 | 948 | |
2da55cfd TW |
949 | mutex_lock(&bus->cl_bus_lock); |
950 | ||
6009595a TW |
951 | down_read(&bus->me_clients_rwsem); |
952 | list_for_each_entry(me_cl, &bus->me_clients, list) | |
ae48d74d | 953 | mei_cl_bus_dev_init(bus, me_cl); |
6009595a | 954 | up_read(&bus->me_clients_rwsem); |
e46980a1 | 955 | |
6009595a | 956 | list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) { |
e46980a1 | 957 | |
6009595a TW |
958 | if (!mei_me_cl_is_active(cldev->me_cl)) { |
959 | mei_cl_bus_remove_device(cldev); | |
960 | continue; | |
961 | } | |
e46980a1 | 962 | |
6009595a TW |
963 | if (cldev->is_added) |
964 | continue; | |
965 | ||
ae48d74d | 966 | if (mei_cl_bus_dev_setup(bus, cldev)) |
6009595a TW |
967 | mei_cl_bus_dev_add(cldev); |
968 | else { | |
969 | list_del_init(&cldev->bus_list); | |
970 | put_device(&cldev->dev); | |
971 | } | |
972 | } | |
973 | mutex_unlock(&bus->cl_bus_lock); | |
974 | ||
975 | dev_dbg(bus->dev, "rescan end"); | |
62382997 | 976 | } |
e46980a1 | 977 | |
a816a00e AU |
978 | void mei_cl_bus_rescan_work(struct work_struct *work) |
979 | { | |
980 | struct mei_device *bus = | |
981 | container_of(work, struct mei_device, bus_rescan_work); | |
025fb792 AU |
982 | struct mei_me_client *me_cl; |
983 | ||
984 | mutex_lock(&bus->device_lock); | |
985 | me_cl = mei_me_cl_by_uuid(bus, &mei_amthif_guid); | |
986 | if (me_cl) | |
987 | mei_amthif_host_init(bus, me_cl); | |
988 | mei_me_cl_put(me_cl); | |
989 | mutex_unlock(&bus->device_lock); | |
a816a00e AU |
990 | |
991 | mei_cl_bus_rescan(bus); | |
992 | } | |
993 | ||
d49dc5e7 TW |
994 | int __mei_cldev_driver_register(struct mei_cl_driver *cldrv, |
995 | struct module *owner) | |
62382997 TW |
996 | { |
997 | int err; | |
e46980a1 | 998 | |
62382997 TW |
999 | cldrv->driver.name = cldrv->name; |
1000 | cldrv->driver.owner = owner; | |
1001 | cldrv->driver.bus = &mei_cl_bus_type; | |
e46980a1 | 1002 | |
62382997 TW |
1003 | err = driver_register(&cldrv->driver); |
1004 | if (err) | |
1005 | return err; | |
e46980a1 | 1006 | |
62382997 | 1007 | pr_debug("mei: driver [%s] registered\n", cldrv->driver.name); |
e46980a1 | 1008 | |
62382997 | 1009 | return 0; |
e46980a1 | 1010 | } |
d49dc5e7 | 1011 | EXPORT_SYMBOL_GPL(__mei_cldev_driver_register); |
e46980a1 | 1012 | |
d49dc5e7 | 1013 | void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv) |
cf3baefb | 1014 | { |
62382997 | 1015 | driver_unregister(&cldrv->driver); |
cf3baefb | 1016 | |
62382997 | 1017 | pr_debug("mei: driver [%s] unregistered\n", cldrv->driver.name); |
cf3baefb | 1018 | } |
d49dc5e7 | 1019 | EXPORT_SYMBOL_GPL(mei_cldev_driver_unregister); |
cf3baefb | 1020 | |
6009595a | 1021 | |
cf3baefb SO |
1022 | int __init mei_cl_bus_init(void) |
1023 | { | |
1024 | return bus_register(&mei_cl_bus_type); | |
1025 | } | |
1026 | ||
1027 | void __exit mei_cl_bus_exit(void) | |
1028 | { | |
1029 | bus_unregister(&mei_cl_bus_type); | |
1030 | } |