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16#include <linux/module.h>
17#include <linux/device.h>
18#include <linux/kernel.h>
19#include <linux/sched.h>
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>
25#include <linux/mei_cl_bus.h>
26
27#include "mei_dev.h"
28#include "client.h"
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
33static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
34{
35 struct mei_cl_device *device = to_mei_cl_device(dev);
36 struct mei_cl_driver *driver = to_mei_cl_driver(drv);
37 const struct mei_cl_device_id *id;
38
39 if (!device)
40 return 0;
41
42 if (!driver || !driver->id_table)
43 return 0;
44
45 id = driver->id_table;
46
47 while (id->name[0]) {
48 if (!strncmp(dev_name(dev), id->name, sizeof(id->name)))
49 return 1;
50
51 id++;
52 }
53
54 return 0;
55}
56
57static int mei_cl_device_probe(struct device *dev)
58{
59 struct mei_cl_device *device = to_mei_cl_device(dev);
60 struct mei_cl_driver *driver;
61 struct mei_cl_device_id id;
62
63 if (!device)
64 return 0;
65
66 driver = to_mei_cl_driver(dev->driver);
67 if (!driver || !driver->probe)
68 return -ENODEV;
69
70 dev_dbg(dev, "Device probe\n");
71
72 strlcpy(id.name, dev_name(dev), sizeof(id.name));
73
74 return driver->probe(device, &id);
75}
76
77static int mei_cl_device_remove(struct device *dev)
78{
79 struct mei_cl_device *device = to_mei_cl_device(dev);
80 struct mei_cl_driver *driver;
81
82 if (!device || !dev->driver)
83 return 0;
84
85 if (device->event_cb) {
86 device->event_cb = NULL;
87 cancel_work_sync(&device->event_work);
88 }
89
90 driver = to_mei_cl_driver(dev->driver);
91 if (!driver->remove) {
92 dev->driver = NULL;
93
94 return 0;
95 }
96
97 return driver->remove(device);
98}
99
100static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
101 char *buf)
102{
103 int len;
104
105 len = snprintf(buf, PAGE_SIZE, "mei:%s\n", dev_name(dev));
106
107 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
108}
109static DEVICE_ATTR_RO(modalias);
110
111static struct attribute *mei_cl_dev_attrs[] = {
112 &dev_attr_modalias.attr,
113 NULL,
114};
115ATTRIBUTE_GROUPS(mei_cl_dev);
116
117static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
118{
119 if (add_uevent_var(env, "MODALIAS=mei:%s", dev_name(dev)))
120 return -ENOMEM;
121
122 return 0;
123}
124
125static struct bus_type mei_cl_bus_type = {
126 .name = "mei",
127 .dev_groups = mei_cl_dev_groups,
128 .match = mei_cl_device_match,
129 .probe = mei_cl_device_probe,
130 .remove = mei_cl_device_remove,
131 .uevent = mei_cl_uevent,
132};
133
134static void mei_cl_dev_release(struct device *dev)
135{
136 kfree(to_mei_cl_device(dev));
137}
138
139static struct device_type mei_cl_device_type = {
140 .release = mei_cl_dev_release,
141};
142
143struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev,
144 uuid_le uuid)
145{
146 struct mei_cl *cl;
147
148 list_for_each_entry(cl, &dev->device_list, device_link) {
149 if (!uuid_le_cmp(uuid, cl->cl_uuid))
150 return cl;
151 }
152
153 return NULL;
154}
155struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
156 uuid_le uuid, char *name,
157 struct mei_cl_ops *ops)
158{
159 struct mei_cl_device *device;
160 struct mei_cl *cl;
161 int status;
162
163 cl = mei_cl_bus_find_cl_by_uuid(dev, uuid);
164 if (cl == NULL)
165 return NULL;
166
167 device = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
168 if (!device)
169 return NULL;
170
171 device->cl = cl;
172 device->ops = ops;
173
174 device->dev.parent = dev->dev;
175 device->dev.bus = &mei_cl_bus_type;
176 device->dev.type = &mei_cl_device_type;
177
178 dev_set_name(&device->dev, "%s", name);
179
180 status = device_register(&device->dev);
181 if (status) {
182 dev_err(dev->dev, "Failed to register MEI device\n");
183 kfree(device);
184 return NULL;
185 }
186
187 cl->device = device;
188
189 dev_dbg(&device->dev, "client %s registered\n", name);
190
191 return device;
192}
193EXPORT_SYMBOL_GPL(mei_cl_add_device);
194
195void mei_cl_remove_device(struct mei_cl_device *device)
196{
197 device_unregister(&device->dev);
198}
199EXPORT_SYMBOL_GPL(mei_cl_remove_device);
200
201int __mei_cl_driver_register(struct mei_cl_driver *driver, struct module *owner)
202{
203 int err;
204
205 driver->driver.name = driver->name;
206 driver->driver.owner = owner;
207 driver->driver.bus = &mei_cl_bus_type;
208
209 err = driver_register(&driver->driver);
210 if (err)
211 return err;
212
213 pr_debug("mei: driver [%s] registered\n", driver->driver.name);
214
215 return 0;
216}
217EXPORT_SYMBOL_GPL(__mei_cl_driver_register);
218
219void mei_cl_driver_unregister(struct mei_cl_driver *driver)
220{
221 driver_unregister(&driver->driver);
222
223 pr_debug("mei: driver [%s] unregistered\n", driver->driver.name);
224}
225EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
226
227static ssize_t ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
228 bool blocking)
229{
230 struct mei_device *dev;
231 struct mei_me_client *me_cl = NULL;
232 struct mei_cl_cb *cb = NULL;
233 ssize_t rets;
234
235 if (WARN_ON(!cl || !cl->dev))
236 return -ENODEV;
237
238 dev = cl->dev;
239
240 mutex_lock(&dev->device_lock);
241 if (!mei_cl_is_connected(cl)) {
242 rets = -ENODEV;
243 goto out;
244 }
245
246
247 me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
248 if (!me_cl) {
249 rets = -ENOTTY;
250 goto out;
251 }
252
253 if (length > me_cl->props.max_msg_length) {
254 rets = -EFBIG;
255 goto out;
256 }
257
258 cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
259 if (!cb) {
260 rets = -ENOMEM;
261 goto out;
262 }
263
264 memcpy(cb->buf.data, buf, length);
265
266 rets = mei_cl_write(cl, cb, blocking);
267
268out:
269 mei_me_cl_put(me_cl);
270 mutex_unlock(&dev->device_lock);
271 if (rets < 0)
272 mei_io_cb_free(cb);
273
274 return rets;
275}
276
277ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
278{
279 struct mei_device *dev;
280 struct mei_cl_cb *cb;
281 size_t r_length;
282 ssize_t rets;
283
284 if (WARN_ON(!cl || !cl->dev))
285 return -ENODEV;
286
287 dev = cl->dev;
288
289 mutex_lock(&dev->device_lock);
290
291 cb = mei_cl_read_cb(cl, NULL);
292 if (cb)
293 goto copy;
294
295 rets = mei_cl_read_start(cl, length, NULL);
296 if (rets && rets != -EBUSY)
297 goto out;
298
299 if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) {
300
301 mutex_unlock(&dev->device_lock);
302
303 if (wait_event_interruptible(cl->rx_wait,
304 (!list_empty(&cl->rd_completed)) ||
305 (!mei_cl_is_connected(cl)))) {
306
307 if (signal_pending(current))
308 return -EINTR;
309 return -ERESTARTSYS;
310 }
311
312 mutex_lock(&dev->device_lock);
313
314 if (!mei_cl_is_connected(cl)) {
315 rets = -EBUSY;
316 goto out;
317 }
318 }
319
320 cb = mei_cl_read_cb(cl, NULL);
321 if (!cb) {
322 rets = 0;
323 goto out;
324 }
325
326copy:
327 if (cb->status) {
328 rets = cb->status;
329 goto free;
330 }
331
332 r_length = min_t(size_t, length, cb->buf_idx);
333 memcpy(buf, cb->buf.data, r_length);
334 rets = r_length;
335
336free:
337 mei_io_cb_free(cb);
338out:
339 mutex_unlock(&dev->device_lock);
340
341 return rets;
342}
343
344inline ssize_t __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length)
345{
346 return ___mei_cl_send(cl, buf, length, 0);
347}
348
349inline ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
350{
351 return ___mei_cl_send(cl, buf, length, 1);
352}
353
354ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
355{
356 struct mei_cl *cl = device->cl;
357
358 if (cl == NULL)
359 return -ENODEV;
360
361 if (device->ops && device->ops->send)
362 return device->ops->send(device, buf, length);
363
364 return __mei_cl_send(cl, buf, length);
365}
366EXPORT_SYMBOL_GPL(mei_cl_send);
367
368ssize_t mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length)
369{
370 struct mei_cl *cl = device->cl;
371
372 if (cl == NULL)
373 return -ENODEV;
374
375 if (device->ops && device->ops->recv)
376 return device->ops->recv(device, buf, length);
377
378 return __mei_cl_recv(cl, buf, length);
379}
380EXPORT_SYMBOL_GPL(mei_cl_recv);
381
382static void mei_bus_event_work(struct work_struct *work)
383{
384 struct mei_cl_device *device;
385
386 device = container_of(work, struct mei_cl_device, event_work);
387
388 if (device->event_cb)
389 device->event_cb(device, device->events, device->event_context);
390
391 device->events = 0;
392
393
394 mei_cl_read_start(device->cl, 0, NULL);
395}
396
397int mei_cl_register_event_cb(struct mei_cl_device *device,
398 mei_cl_event_cb_t event_cb, void *context)
399{
400 if (device->event_cb)
401 return -EALREADY;
402
403 device->events = 0;
404 device->event_cb = event_cb;
405 device->event_context = context;
406 INIT_WORK(&device->event_work, mei_bus_event_work);
407
408 mei_cl_read_start(device->cl, 0, NULL);
409
410 return 0;
411}
412EXPORT_SYMBOL_GPL(mei_cl_register_event_cb);
413
414void *mei_cl_get_drvdata(const struct mei_cl_device *device)
415{
416 return dev_get_drvdata(&device->dev);
417}
418EXPORT_SYMBOL_GPL(mei_cl_get_drvdata);
419
420void mei_cl_set_drvdata(struct mei_cl_device *device, void *data)
421{
422 dev_set_drvdata(&device->dev, data);
423}
424EXPORT_SYMBOL_GPL(mei_cl_set_drvdata);
425
426int mei_cl_enable_device(struct mei_cl_device *device)
427{
428 int err;
429 struct mei_device *dev;
430 struct mei_cl *cl = device->cl;
431
432 if (cl == NULL)
433 return -ENODEV;
434
435 dev = cl->dev;
436
437 mutex_lock(&dev->device_lock);
438
439 err = mei_cl_connect(cl, NULL);
440 if (err < 0) {
441 mutex_unlock(&dev->device_lock);
442 dev_err(dev->dev, "Could not connect to the ME client");
443
444 return err;
445 }
446
447 mutex_unlock(&dev->device_lock);
448
449 if (device->event_cb)
450 mei_cl_read_start(device->cl, 0, NULL);
451
452 if (!device->ops || !device->ops->enable)
453 return 0;
454
455 return device->ops->enable(device);
456}
457EXPORT_SYMBOL_GPL(mei_cl_enable_device);
458
459int mei_cl_disable_device(struct mei_cl_device *device)
460{
461 int err;
462 struct mei_device *dev;
463 struct mei_cl *cl = device->cl;
464
465 if (cl == NULL)
466 return -ENODEV;
467
468 dev = cl->dev;
469
470 if (device->ops && device->ops->disable)
471 device->ops->disable(device);
472
473 device->event_cb = NULL;
474
475 mutex_lock(&dev->device_lock);
476
477 if (!mei_cl_is_connected(cl)) {
478 dev_err(dev->dev, "Already disconnected");
479 err = 0;
480 goto out;
481 }
482
483 cl->state = MEI_FILE_DISCONNECTING;
484
485 err = mei_cl_disconnect(cl);
486 if (err < 0) {
487 dev_err(dev->dev, "Could not disconnect from the ME client");
488 goto out;
489 }
490
491
492 mei_cl_flush_queues(cl, NULL);
493
494out:
495 mutex_unlock(&dev->device_lock);
496 return err;
497
498}
499EXPORT_SYMBOL_GPL(mei_cl_disable_device);
500
501void mei_cl_bus_rx_event(struct mei_cl *cl)
502{
503 struct mei_cl_device *device = cl->device;
504
505 if (!device || !device->event_cb)
506 return;
507
508 set_bit(MEI_CL_EVENT_RX, &device->events);
509
510 schedule_work(&device->event_work);
511}
512
513void mei_cl_bus_remove_devices(struct mei_device *dev)
514{
515 struct mei_cl *cl, *next;
516
517 mutex_lock(&dev->device_lock);
518 list_for_each_entry_safe(cl, next, &dev->device_list, device_link) {
519 if (cl->device)
520 mei_cl_remove_device(cl->device);
521
522 list_del(&cl->device_link);
523 mei_cl_unlink(cl);
524 kfree(cl);
525 }
526 mutex_unlock(&dev->device_lock);
527}
528
529int __init mei_cl_bus_init(void)
530{
531 return bus_register(&mei_cl_bus_type);
532}
533
534void __exit mei_cl_bus_exit(void)
535{
536 bus_unregister(&mei_cl_bus_type);
537}
538
