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