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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2003-2018, Intel Corporation. All rights reserved.
4 * Intel Management Engine Interface (Intel MEI) Linux driver
5 */
6
7#include <linux/module.h>
8#include <linux/moduleparam.h>
9#include <linux/kernel.h>
10#include <linux/device.h>
11#include <linux/slab.h>
12#include <linux/fs.h>
13#include <linux/errno.h>
14#include <linux/types.h>
15#include <linux/fcntl.h>
16#include <linux/poll.h>
17#include <linux/init.h>
18#include <linux/ioctl.h>
19#include <linux/cdev.h>
20#include <linux/sched/signal.h>
21#include <linux/uuid.h>
22#include <linux/compat.h>
23#include <linux/jiffies.h>
24#include <linux/interrupt.h>
25
26#include <linux/mei.h>
27
28#include "mei_dev.h"
29#include "client.h"
30
31static struct class *mei_class;
32static dev_t mei_devt;
33#define MEI_MAX_DEVS MINORMASK
34static DEFINE_MUTEX(mei_minor_lock);
35static DEFINE_IDR(mei_idr);
36
37/**
38 * mei_open - the open function
39 *
40 * @inode: pointer to inode structure
41 * @file: pointer to file structure
42 *
43 * Return: 0 on success, <0 on error
44 */
45static int mei_open(struct inode *inode, struct file *file)
46{
47 struct mei_device *dev;
48 struct mei_cl *cl;
49
50 int err;
51
52 dev = container_of(inode->i_cdev, struct mei_device, cdev);
53 if (!dev)
54 return -ENODEV;
55
56 mutex_lock(&dev->device_lock);
57
58 if (dev->dev_state != MEI_DEV_ENABLED) {
59 dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n",
60 mei_dev_state_str(dev->dev_state));
61 err = -ENODEV;
62 goto err_unlock;
63 }
64
65 cl = mei_cl_alloc_linked(dev);
66 if (IS_ERR(cl)) {
67 err = PTR_ERR(cl);
68 goto err_unlock;
69 }
70
71 cl->fp = file;
72 file->private_data = cl;
73
74 mutex_unlock(&dev->device_lock);
75
76 return nonseekable_open(inode, file);
77
78err_unlock:
79 mutex_unlock(&dev->device_lock);
80 return err;
81}
82
83/**
84 * mei_release - the release function
85 *
86 * @inode: pointer to inode structure
87 * @file: pointer to file structure
88 *
89 * Return: 0 on success, <0 on error
90 */
91static int mei_release(struct inode *inode, struct file *file)
92{
93 struct mei_cl *cl = file->private_data;
94 struct mei_device *dev;
95 int rets;
96
97 if (WARN_ON(!cl || !cl->dev))
98 return -ENODEV;
99
100 dev = cl->dev;
101
102 mutex_lock(&dev->device_lock);
103
104 rets = mei_cl_disconnect(cl);
105
106 mei_cl_flush_queues(cl, file);
107 cl_dbg(dev, cl, "removing\n");
108
109 mei_cl_unlink(cl);
110
111 file->private_data = NULL;
112
113 kfree(cl);
114
115 mutex_unlock(&dev->device_lock);
116 return rets;
117}
118
119
120/**
121 * mei_read - the read function.
122 *
123 * @file: pointer to file structure
124 * @ubuf: pointer to user buffer
125 * @length: buffer length
126 * @offset: data offset in buffer
127 *
128 * Return: >=0 data length on success , <0 on error
129 */
130static ssize_t mei_read(struct file *file, char __user *ubuf,
131 size_t length, loff_t *offset)
132{
133 struct mei_cl *cl = file->private_data;
134 struct mei_device *dev;
135 struct mei_cl_cb *cb = NULL;
136 bool nonblock = !!(file->f_flags & O_NONBLOCK);
137 ssize_t rets;
138
139 if (WARN_ON(!cl || !cl->dev))
140 return -ENODEV;
141
142 dev = cl->dev;
143
144
145 mutex_lock(&dev->device_lock);
146 if (dev->dev_state != MEI_DEV_ENABLED) {
147 rets = -ENODEV;
148 goto out;
149 }
150
151 if (length == 0) {
152 rets = 0;
153 goto out;
154 }
155
156 if (ubuf == NULL) {
157 rets = -EMSGSIZE;
158 goto out;
159 }
160
161 cb = mei_cl_read_cb(cl, file);
162 if (cb)
163 goto copy_buffer;
164
165 if (*offset > 0)
166 *offset = 0;
167
168 rets = mei_cl_read_start(cl, length, file);
169 if (rets && rets != -EBUSY) {
170 cl_dbg(dev, cl, "mei start read failure status = %zd\n", rets);
171 goto out;
172 }
173
174 if (nonblock) {
175 rets = -EAGAIN;
176 goto out;
177 }
178
179 mutex_unlock(&dev->device_lock);
180 if (wait_event_interruptible(cl->rx_wait,
181 !list_empty(&cl->rd_completed) ||
182 !mei_cl_is_connected(cl))) {
183 if (signal_pending(current))
184 return -EINTR;
185 return -ERESTARTSYS;
186 }
187 mutex_lock(&dev->device_lock);
188
189 if (!mei_cl_is_connected(cl)) {
190 rets = -ENODEV;
191 goto out;
192 }
193
194 cb = mei_cl_read_cb(cl, file);
195 if (!cb) {
196 rets = 0;
197 goto out;
198 }
199
200copy_buffer:
201 /* now copy the data to user space */
202 if (cb->status) {
203 rets = cb->status;
204 cl_dbg(dev, cl, "read operation failed %zd\n", rets);
205 goto free;
206 }
207
208 cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n",
209 cb->buf.size, cb->buf_idx, *offset);
210 if (*offset >= cb->buf_idx) {
211 rets = 0;
212 goto free;
213 }
214
215 /* length is being truncated to PAGE_SIZE,
216 * however buf_idx may point beyond that */
217 length = min_t(size_t, length, cb->buf_idx - *offset);
218
219 if (copy_to_user(ubuf, cb->buf.data + *offset, length)) {
220 dev_dbg(dev->dev, "failed to copy data to userland\n");
221 rets = -EFAULT;
222 goto free;
223 }
224
225 rets = length;
226 *offset += length;
227 /* not all data was read, keep the cb */
228 if (*offset < cb->buf_idx)
229 goto out;
230
231free:
232 mei_io_cb_free(cb);
233 *offset = 0;
234
235out:
236 cl_dbg(dev, cl, "end mei read rets = %zd\n", rets);
237 mutex_unlock(&dev->device_lock);
238 return rets;
239}
240/**
241 * mei_write - the write function.
242 *
243 * @file: pointer to file structure
244 * @ubuf: pointer to user buffer
245 * @length: buffer length
246 * @offset: data offset in buffer
247 *
248 * Return: >=0 data length on success , <0 on error
249 */
250static ssize_t mei_write(struct file *file, const char __user *ubuf,
251 size_t length, loff_t *offset)
252{
253 struct mei_cl *cl = file->private_data;
254 struct mei_cl_cb *cb;
255 struct mei_device *dev;
256 ssize_t rets;
257
258 if (WARN_ON(!cl || !cl->dev))
259 return -ENODEV;
260
261 dev = cl->dev;
262
263 mutex_lock(&dev->device_lock);
264
265 if (dev->dev_state != MEI_DEV_ENABLED) {
266 rets = -ENODEV;
267 goto out;
268 }
269
270 if (!mei_cl_is_connected(cl)) {
271 cl_err(dev, cl, "is not connected");
272 rets = -ENODEV;
273 goto out;
274 }
275
276 if (!mei_me_cl_is_active(cl->me_cl)) {
277 rets = -ENOTTY;
278 goto out;
279 }
280
281 if (length > mei_cl_mtu(cl)) {
282 rets = -EFBIG;
283 goto out;
284 }
285
286 if (length == 0) {
287 rets = 0;
288 goto out;
289 }
290
291 while (cl->tx_cb_queued >= dev->tx_queue_limit) {
292 if (file->f_flags & O_NONBLOCK) {
293 rets = -EAGAIN;
294 goto out;
295 }
296 mutex_unlock(&dev->device_lock);
297 rets = wait_event_interruptible(cl->tx_wait,
298 cl->writing_state == MEI_WRITE_COMPLETE ||
299 (!mei_cl_is_connected(cl)));
300 mutex_lock(&dev->device_lock);
301 if (rets) {
302 if (signal_pending(current))
303 rets = -EINTR;
304 goto out;
305 }
306 if (!mei_cl_is_connected(cl)) {
307 rets = -ENODEV;
308 goto out;
309 }
310 }
311
312 cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
313 if (!cb) {
314 rets = -ENOMEM;
315 goto out;
316 }
317
318 rets = copy_from_user(cb->buf.data, ubuf, length);
319 if (rets) {
320 dev_dbg(dev->dev, "failed to copy data from userland\n");
321 rets = -EFAULT;
322 mei_io_cb_free(cb);
323 goto out;
324 }
325
326 rets = mei_cl_write(cl, cb);
327out:
328 mutex_unlock(&dev->device_lock);
329 return rets;
330}
331
332/**
333 * mei_ioctl_connect_client - the connect to fw client IOCTL function
334 *
335 * @file: private data of the file object
336 * @data: IOCTL connect data, input and output parameters
337 *
338 * Locking: called under "dev->device_lock" lock
339 *
340 * Return: 0 on success, <0 on failure.
341 */
342static int mei_ioctl_connect_client(struct file *file,
343 struct mei_connect_client_data *data)
344{
345 struct mei_device *dev;
346 struct mei_client *client;
347 struct mei_me_client *me_cl;
348 struct mei_cl *cl;
349 int rets;
350
351 cl = file->private_data;
352 dev = cl->dev;
353
354 if (dev->dev_state != MEI_DEV_ENABLED)
355 return -ENODEV;
356
357 if (cl->state != MEI_FILE_INITIALIZING &&
358 cl->state != MEI_FILE_DISCONNECTED)
359 return -EBUSY;
360
361 /* find ME client we're trying to connect to */
362 me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
363 if (!me_cl) {
364 dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n",
365 &data->in_client_uuid);
366 rets = -ENOTTY;
367 goto end;
368 }
369
370 if (me_cl->props.fixed_address) {
371 bool forbidden = dev->override_fixed_address ?
372 !dev->allow_fixed_address : !dev->hbm_f_fa_supported;
373 if (forbidden) {
374 dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n",
375 &data->in_client_uuid);
376 rets = -ENOTTY;
377 goto end;
378 }
379 }
380
381 dev_dbg(dev->dev, "Connect to FW Client ID = %d\n",
382 me_cl->client_id);
383 dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n",
384 me_cl->props.protocol_version);
385 dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n",
386 me_cl->props.max_msg_length);
387
388 /* prepare the output buffer */
389 client = &data->out_client_properties;
390 client->max_msg_length = me_cl->props.max_msg_length;
391 client->protocol_version = me_cl->props.protocol_version;
392 dev_dbg(dev->dev, "Can connect?\n");
393
394 rets = mei_cl_connect(cl, me_cl, file);
395
396end:
397 mei_me_cl_put(me_cl);
398 return rets;
399}
400
401/**
402 * mei_ioctl_client_notify_request -
403 * propagate event notification request to client
404 *
405 * @file: pointer to file structure
406 * @request: 0 - disable, 1 - enable
407 *
408 * Return: 0 on success , <0 on error
409 */
410static int mei_ioctl_client_notify_request(const struct file *file, u32 request)
411{
412 struct mei_cl *cl = file->private_data;
413
414 if (request != MEI_HBM_NOTIFICATION_START &&
415 request != MEI_HBM_NOTIFICATION_STOP)
416 return -EINVAL;
417
418 return mei_cl_notify_request(cl, file, (u8)request);
419}
420
421/**
422 * mei_ioctl_client_notify_get - wait for notification request
423 *
424 * @file: pointer to file structure
425 * @notify_get: 0 - disable, 1 - enable
426 *
427 * Return: 0 on success , <0 on error
428 */
429static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get)
430{
431 struct mei_cl *cl = file->private_data;
432 bool notify_ev;
433 bool block = (file->f_flags & O_NONBLOCK) == 0;
434 int rets;
435
436 rets = mei_cl_notify_get(cl, block, ¬ify_ev);
437 if (rets)
438 return rets;
439
440 *notify_get = notify_ev ? 1 : 0;
441 return 0;
442}
443
444/**
445 * mei_ioctl - the IOCTL function
446 *
447 * @file: pointer to file structure
448 * @cmd: ioctl command
449 * @data: pointer to mei message structure
450 *
451 * Return: 0 on success , <0 on error
452 */
453static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
454{
455 struct mei_device *dev;
456 struct mei_cl *cl = file->private_data;
457 struct mei_connect_client_data connect_data;
458 u32 notify_get, notify_req;
459 int rets;
460
461
462 if (WARN_ON(!cl || !cl->dev))
463 return -ENODEV;
464
465 dev = cl->dev;
466
467 dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd);
468
469 mutex_lock(&dev->device_lock);
470 if (dev->dev_state != MEI_DEV_ENABLED) {
471 rets = -ENODEV;
472 goto out;
473 }
474
475 switch (cmd) {
476 case IOCTL_MEI_CONNECT_CLIENT:
477 dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
478 if (copy_from_user(&connect_data, (char __user *)data,
479 sizeof(struct mei_connect_client_data))) {
480 dev_dbg(dev->dev, "failed to copy data from userland\n");
481 rets = -EFAULT;
482 goto out;
483 }
484
485 rets = mei_ioctl_connect_client(file, &connect_data);
486 if (rets)
487 goto out;
488
489 /* if all is ok, copying the data back to user. */
490 if (copy_to_user((char __user *)data, &connect_data,
491 sizeof(struct mei_connect_client_data))) {
492 dev_dbg(dev->dev, "failed to copy data to userland\n");
493 rets = -EFAULT;
494 goto out;
495 }
496
497 break;
498
499 case IOCTL_MEI_NOTIFY_SET:
500 dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n");
501 if (copy_from_user(¬ify_req,
502 (char __user *)data, sizeof(notify_req))) {
503 dev_dbg(dev->dev, "failed to copy data from userland\n");
504 rets = -EFAULT;
505 goto out;
506 }
507 rets = mei_ioctl_client_notify_request(file, notify_req);
508 break;
509
510 case IOCTL_MEI_NOTIFY_GET:
511 dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n");
512 rets = mei_ioctl_client_notify_get(file, ¬ify_get);
513 if (rets)
514 goto out;
515
516 dev_dbg(dev->dev, "copy connect data to user\n");
517 if (copy_to_user((char __user *)data,
518 ¬ify_get, sizeof(notify_get))) {
519 dev_dbg(dev->dev, "failed to copy data to userland\n");
520 rets = -EFAULT;
521 goto out;
522
523 }
524 break;
525
526 default:
527 rets = -ENOIOCTLCMD;
528 }
529
530out:
531 mutex_unlock(&dev->device_lock);
532 return rets;
533}
534
535/**
536 * mei_compat_ioctl - the compat IOCTL function
537 *
538 * @file: pointer to file structure
539 * @cmd: ioctl command
540 * @data: pointer to mei message structure
541 *
542 * Return: 0 on success , <0 on error
543 */
544#ifdef CONFIG_COMPAT
545static long mei_compat_ioctl(struct file *file,
546 unsigned int cmd, unsigned long data)
547{
548 return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
549}
550#endif
551
552
553/**
554 * mei_poll - the poll function
555 *
556 * @file: pointer to file structure
557 * @wait: pointer to poll_table structure
558 *
559 * Return: poll mask
560 */
561static __poll_t mei_poll(struct file *file, poll_table *wait)
562{
563 __poll_t req_events = poll_requested_events(wait);
564 struct mei_cl *cl = file->private_data;
565 struct mei_device *dev;
566 __poll_t mask = 0;
567 bool notify_en;
568
569 if (WARN_ON(!cl || !cl->dev))
570 return EPOLLERR;
571
572 dev = cl->dev;
573
574 mutex_lock(&dev->device_lock);
575
576 notify_en = cl->notify_en && (req_events & EPOLLPRI);
577
578 if (dev->dev_state != MEI_DEV_ENABLED ||
579 !mei_cl_is_connected(cl)) {
580 mask = EPOLLERR;
581 goto out;
582 }
583
584 if (notify_en) {
585 poll_wait(file, &cl->ev_wait, wait);
586 if (cl->notify_ev)
587 mask |= EPOLLPRI;
588 }
589
590 if (req_events & (EPOLLIN | EPOLLRDNORM)) {
591 poll_wait(file, &cl->rx_wait, wait);
592
593 if (!list_empty(&cl->rd_completed))
594 mask |= EPOLLIN | EPOLLRDNORM;
595 else
596 mei_cl_read_start(cl, mei_cl_mtu(cl), file);
597 }
598
599 if (req_events & (EPOLLOUT | EPOLLWRNORM)) {
600 poll_wait(file, &cl->tx_wait, wait);
601 if (cl->tx_cb_queued < dev->tx_queue_limit)
602 mask |= EPOLLOUT | EPOLLWRNORM;
603 }
604
605out:
606 mutex_unlock(&dev->device_lock);
607 return mask;
608}
609
610/**
611 * mei_cl_is_write_queued - check if the client has pending writes.
612 *
613 * @cl: writing host client
614 *
615 * Return: true if client is writing, false otherwise.
616 */
617static bool mei_cl_is_write_queued(struct mei_cl *cl)
618{
619 struct mei_device *dev = cl->dev;
620 struct mei_cl_cb *cb;
621
622 list_for_each_entry(cb, &dev->write_list, list)
623 if (cb->cl == cl)
624 return true;
625 list_for_each_entry(cb, &dev->write_waiting_list, list)
626 if (cb->cl == cl)
627 return true;
628 return false;
629}
630
631/**
632 * mei_fsync - the fsync handler
633 *
634 * @fp: pointer to file structure
635 * @start: unused
636 * @end: unused
637 * @datasync: unused
638 *
639 * Return: 0 on success, -ENODEV if client is not connected
640 */
641static int mei_fsync(struct file *fp, loff_t start, loff_t end, int datasync)
642{
643 struct mei_cl *cl = fp->private_data;
644 struct mei_device *dev;
645 int rets;
646
647 if (WARN_ON(!cl || !cl->dev))
648 return -ENODEV;
649
650 dev = cl->dev;
651
652 mutex_lock(&dev->device_lock);
653
654 if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) {
655 rets = -ENODEV;
656 goto out;
657 }
658
659 while (mei_cl_is_write_queued(cl)) {
660 mutex_unlock(&dev->device_lock);
661 rets = wait_event_interruptible(cl->tx_wait,
662 cl->writing_state == MEI_WRITE_COMPLETE ||
663 !mei_cl_is_connected(cl));
664 mutex_lock(&dev->device_lock);
665 if (rets) {
666 if (signal_pending(current))
667 rets = -EINTR;
668 goto out;
669 }
670 if (!mei_cl_is_connected(cl)) {
671 rets = -ENODEV;
672 goto out;
673 }
674 }
675 rets = 0;
676out:
677 mutex_unlock(&dev->device_lock);
678 return rets;
679}
680
681/**
682 * mei_fasync - asynchronous io support
683 *
684 * @fd: file descriptor
685 * @file: pointer to file structure
686 * @band: band bitmap
687 *
688 * Return: negative on error,
689 * 0 if it did no changes,
690 * and positive a process was added or deleted
691 */
692static int mei_fasync(int fd, struct file *file, int band)
693{
694
695 struct mei_cl *cl = file->private_data;
696
697 if (!mei_cl_is_connected(cl))
698 return -ENODEV;
699
700 return fasync_helper(fd, file, band, &cl->ev_async);
701}
702
703/**
704 * fw_status_show - mei device fw_status attribute show method
705 *
706 * @device: device pointer
707 * @attr: attribute pointer
708 * @buf: char out buffer
709 *
710 * Return: number of the bytes printed into buf or error
711 */
712static ssize_t fw_status_show(struct device *device,
713 struct device_attribute *attr, char *buf)
714{
715 struct mei_device *dev = dev_get_drvdata(device);
716 struct mei_fw_status fw_status;
717 int err, i;
718 ssize_t cnt = 0;
719
720 mutex_lock(&dev->device_lock);
721 err = mei_fw_status(dev, &fw_status);
722 mutex_unlock(&dev->device_lock);
723 if (err) {
724 dev_err(device, "read fw_status error = %d\n", err);
725 return err;
726 }
727
728 for (i = 0; i < fw_status.count; i++)
729 cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n",
730 fw_status.status[i]);
731 return cnt;
732}
733static DEVICE_ATTR_RO(fw_status);
734
735/**
736 * hbm_ver_show - display HBM protocol version negotiated with FW
737 *
738 * @device: device pointer
739 * @attr: attribute pointer
740 * @buf: char out buffer
741 *
742 * Return: number of the bytes printed into buf or error
743 */
744static ssize_t hbm_ver_show(struct device *device,
745 struct device_attribute *attr, char *buf)
746{
747 struct mei_device *dev = dev_get_drvdata(device);
748 struct hbm_version ver;
749
750 mutex_lock(&dev->device_lock);
751 ver = dev->version;
752 mutex_unlock(&dev->device_lock);
753
754 return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version);
755}
756static DEVICE_ATTR_RO(hbm_ver);
757
758/**
759 * hbm_ver_drv_show - display HBM protocol version advertised by driver
760 *
761 * @device: device pointer
762 * @attr: attribute pointer
763 * @buf: char out buffer
764 *
765 * Return: number of the bytes printed into buf or error
766 */
767static ssize_t hbm_ver_drv_show(struct device *device,
768 struct device_attribute *attr, char *buf)
769{
770 return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION);
771}
772static DEVICE_ATTR_RO(hbm_ver_drv);
773
774static ssize_t tx_queue_limit_show(struct device *device,
775 struct device_attribute *attr, char *buf)
776{
777 struct mei_device *dev = dev_get_drvdata(device);
778 u8 size = 0;
779
780 mutex_lock(&dev->device_lock);
781 size = dev->tx_queue_limit;
782 mutex_unlock(&dev->device_lock);
783
784 return snprintf(buf, PAGE_SIZE, "%u\n", size);
785}
786
787static ssize_t tx_queue_limit_store(struct device *device,
788 struct device_attribute *attr,
789 const char *buf, size_t count)
790{
791 struct mei_device *dev = dev_get_drvdata(device);
792 u8 limit;
793 unsigned int inp;
794 int err;
795
796 err = kstrtouint(buf, 10, &inp);
797 if (err)
798 return err;
799 if (inp > MEI_TX_QUEUE_LIMIT_MAX || inp < MEI_TX_QUEUE_LIMIT_MIN)
800 return -EINVAL;
801 limit = inp;
802
803 mutex_lock(&dev->device_lock);
804 dev->tx_queue_limit = limit;
805 mutex_unlock(&dev->device_lock);
806
807 return count;
808}
809static DEVICE_ATTR_RW(tx_queue_limit);
810
811/**
812 * fw_ver_show - display ME FW version
813 *
814 * @device: device pointer
815 * @attr: attribute pointer
816 * @buf: char out buffer
817 *
818 * Return: number of the bytes printed into buf or error
819 */
820static ssize_t fw_ver_show(struct device *device,
821 struct device_attribute *attr, char *buf)
822{
823 struct mei_device *dev = dev_get_drvdata(device);
824 struct mei_fw_version *ver;
825 ssize_t cnt = 0;
826 int i;
827
828 ver = dev->fw_ver;
829
830 for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++)
831 cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%u:%u.%u.%u.%u\n",
832 ver[i].platform, ver[i].major, ver[i].minor,
833 ver[i].hotfix, ver[i].buildno);
834 return cnt;
835}
836static DEVICE_ATTR_RO(fw_ver);
837
838/**
839 * dev_state_show - display device state
840 *
841 * @device: device pointer
842 * @attr: attribute pointer
843 * @buf: char out buffer
844 *
845 * Return: number of the bytes printed into buf or error
846 */
847static ssize_t dev_state_show(struct device *device,
848 struct device_attribute *attr, char *buf)
849{
850 struct mei_device *dev = dev_get_drvdata(device);
851 enum mei_dev_state dev_state;
852
853 mutex_lock(&dev->device_lock);
854 dev_state = dev->dev_state;
855 mutex_unlock(&dev->device_lock);
856
857 return sprintf(buf, "%s", mei_dev_state_str(dev_state));
858}
859static DEVICE_ATTR_RO(dev_state);
860
861/**
862 * dev_set_devstate: set to new device state and notify sysfs file.
863 *
864 * @dev: mei_device
865 * @state: new device state
866 */
867void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state)
868{
869 struct device *clsdev;
870
871 if (dev->dev_state == state)
872 return;
873
874 dev->dev_state = state;
875
876 clsdev = class_find_device_by_devt(mei_class, dev->cdev.dev);
877 if (clsdev) {
878 sysfs_notify(&clsdev->kobj, NULL, "dev_state");
879 put_device(clsdev);
880 }
881}
882
883static struct attribute *mei_attrs[] = {
884 &dev_attr_fw_status.attr,
885 &dev_attr_hbm_ver.attr,
886 &dev_attr_hbm_ver_drv.attr,
887 &dev_attr_tx_queue_limit.attr,
888 &dev_attr_fw_ver.attr,
889 &dev_attr_dev_state.attr,
890 NULL
891};
892ATTRIBUTE_GROUPS(mei);
893
894/*
895 * file operations structure will be used for mei char device.
896 */
897static const struct file_operations mei_fops = {
898 .owner = THIS_MODULE,
899 .read = mei_read,
900 .unlocked_ioctl = mei_ioctl,
901#ifdef CONFIG_COMPAT
902 .compat_ioctl = mei_compat_ioctl,
903#endif
904 .open = mei_open,
905 .release = mei_release,
906 .write = mei_write,
907 .poll = mei_poll,
908 .fsync = mei_fsync,
909 .fasync = mei_fasync,
910 .llseek = no_llseek
911};
912
913/**
914 * mei_minor_get - obtain next free device minor number
915 *
916 * @dev: device pointer
917 *
918 * Return: allocated minor, or -ENOSPC if no free minor left
919 */
920static int mei_minor_get(struct mei_device *dev)
921{
922 int ret;
923
924 mutex_lock(&mei_minor_lock);
925 ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL);
926 if (ret >= 0)
927 dev->minor = ret;
928 else if (ret == -ENOSPC)
929 dev_err(dev->dev, "too many mei devices\n");
930
931 mutex_unlock(&mei_minor_lock);
932 return ret;
933}
934
935/**
936 * mei_minor_free - mark device minor number as free
937 *
938 * @dev: device pointer
939 */
940static void mei_minor_free(struct mei_device *dev)
941{
942 mutex_lock(&mei_minor_lock);
943 idr_remove(&mei_idr, dev->minor);
944 mutex_unlock(&mei_minor_lock);
945}
946
947int mei_register(struct mei_device *dev, struct device *parent)
948{
949 struct device *clsdev; /* class device */
950 int ret, devno;
951
952 ret = mei_minor_get(dev);
953 if (ret < 0)
954 return ret;
955
956 /* Fill in the data structures */
957 devno = MKDEV(MAJOR(mei_devt), dev->minor);
958 cdev_init(&dev->cdev, &mei_fops);
959 dev->cdev.owner = parent->driver->owner;
960
961 /* Add the device */
962 ret = cdev_add(&dev->cdev, devno, 1);
963 if (ret) {
964 dev_err(parent, "unable to add device %d:%d\n",
965 MAJOR(mei_devt), dev->minor);
966 goto err_dev_add;
967 }
968
969 clsdev = device_create_with_groups(mei_class, parent, devno,
970 dev, mei_groups,
971 "mei%d", dev->minor);
972
973 if (IS_ERR(clsdev)) {
974 dev_err(parent, "unable to create device %d:%d\n",
975 MAJOR(mei_devt), dev->minor);
976 ret = PTR_ERR(clsdev);
977 goto err_dev_create;
978 }
979
980 mei_dbgfs_register(dev, dev_name(clsdev));
981
982 return 0;
983
984err_dev_create:
985 cdev_del(&dev->cdev);
986err_dev_add:
987 mei_minor_free(dev);
988 return ret;
989}
990EXPORT_SYMBOL_GPL(mei_register);
991
992void mei_deregister(struct mei_device *dev)
993{
994 int devno;
995
996 devno = dev->cdev.dev;
997 cdev_del(&dev->cdev);
998
999 mei_dbgfs_deregister(dev);
1000
1001 device_destroy(mei_class, devno);
1002
1003 mei_minor_free(dev);
1004}
1005EXPORT_SYMBOL_GPL(mei_deregister);
1006
1007static int __init mei_init(void)
1008{
1009 int ret;
1010
1011 mei_class = class_create(THIS_MODULE, "mei");
1012 if (IS_ERR(mei_class)) {
1013 pr_err("couldn't create class\n");
1014 ret = PTR_ERR(mei_class);
1015 goto err;
1016 }
1017
1018 ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei");
1019 if (ret < 0) {
1020 pr_err("unable to allocate char dev region\n");
1021 goto err_class;
1022 }
1023
1024 ret = mei_cl_bus_init();
1025 if (ret < 0) {
1026 pr_err("unable to initialize bus\n");
1027 goto err_chrdev;
1028 }
1029
1030 return 0;
1031
1032err_chrdev:
1033 unregister_chrdev_region(mei_devt, MEI_MAX_DEVS);
1034err_class:
1035 class_destroy(mei_class);
1036err:
1037 return ret;
1038}
1039
1040static void __exit mei_exit(void)
1041{
1042 unregister_chrdev_region(mei_devt, MEI_MAX_DEVS);
1043 class_destroy(mei_class);
1044 mei_cl_bus_exit();
1045}
1046
1047module_init(mei_init);
1048module_exit(mei_exit);
1049
1050MODULE_AUTHOR("Intel Corporation");
1051MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
1052MODULE_LICENSE("GPL v2");
1053