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34#include <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/errno.h>
37#include <linux/poll.h>
38#include <linux/sched.h>
39#include <linux/spinlock.h>
40#include <linux/slab.h>
41#include <linux/ipmi.h>
42#include <linux/mutex.h>
43#include <linux/init.h>
44#include <linux/device.h>
45#include <linux/compat.h>
46
47struct ipmi_file_private
48{
49 ipmi_user_t user;
50 spinlock_t recv_msg_lock;
51 struct list_head recv_msgs;
52 struct file *file;
53 struct fasync_struct *fasync_queue;
54 wait_queue_head_t wait;
55 struct mutex recv_mutex;
56 int default_retries;
57 unsigned int default_retry_time_ms;
58};
59
60static DEFINE_MUTEX(ipmi_mutex);
61static void file_receive_handler(struct ipmi_recv_msg *msg,
62 void *handler_data)
63{
64 struct ipmi_file_private *priv = handler_data;
65 int was_empty;
66 unsigned long flags;
67
68 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
69
70 was_empty = list_empty(&(priv->recv_msgs));
71 list_add_tail(&(msg->link), &(priv->recv_msgs));
72
73 if (was_empty) {
74 wake_up_interruptible(&priv->wait);
75 kill_fasync(&priv->fasync_queue, SIGIO, POLL_IN);
76 }
77
78 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
79}
80
81static unsigned int ipmi_poll(struct file *file, poll_table *wait)
82{
83 struct ipmi_file_private *priv = file->private_data;
84 unsigned int mask = 0;
85 unsigned long flags;
86
87 poll_wait(file, &priv->wait, wait);
88
89 spin_lock_irqsave(&priv->recv_msg_lock, flags);
90
91 if (!list_empty(&(priv->recv_msgs)))
92 mask |= (POLLIN | POLLRDNORM);
93
94 spin_unlock_irqrestore(&priv->recv_msg_lock, flags);
95
96 return mask;
97}
98
99static int ipmi_fasync(int fd, struct file *file, int on)
100{
101 struct ipmi_file_private *priv = file->private_data;
102 int result;
103
104 mutex_lock(&ipmi_mutex);
105 result = fasync_helper(fd, file, on, &priv->fasync_queue);
106 mutex_unlock(&ipmi_mutex);
107
108 return (result);
109}
110
111static struct ipmi_user_hndl ipmi_hndlrs =
112{
113 .ipmi_recv_hndl = file_receive_handler,
114};
115
116static int ipmi_open(struct inode *inode, struct file *file)
117{
118 int if_num = iminor(inode);
119 int rv;
120 struct ipmi_file_private *priv;
121
122
123 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
124 if (!priv)
125 return -ENOMEM;
126
127 mutex_lock(&ipmi_mutex);
128 priv->file = file;
129
130 rv = ipmi_create_user(if_num,
131 &ipmi_hndlrs,
132 priv,
133 &(priv->user));
134 if (rv) {
135 kfree(priv);
136 goto out;
137 }
138
139 file->private_data = priv;
140
141 spin_lock_init(&(priv->recv_msg_lock));
142 INIT_LIST_HEAD(&(priv->recv_msgs));
143 init_waitqueue_head(&priv->wait);
144 priv->fasync_queue = NULL;
145 mutex_init(&priv->recv_mutex);
146
147
148 priv->default_retries = -1;
149 priv->default_retry_time_ms = 0;
150
151out:
152 mutex_unlock(&ipmi_mutex);
153 return rv;
154}
155
156static int ipmi_release(struct inode *inode, struct file *file)
157{
158 struct ipmi_file_private *priv = file->private_data;
159 int rv;
160
161 rv = ipmi_destroy_user(priv->user);
162 if (rv)
163 return rv;
164
165
166 kfree(priv);
167
168 return 0;
169}
170
171static int handle_send_req(ipmi_user_t user,
172 struct ipmi_req *req,
173 int retries,
174 unsigned int retry_time_ms)
175{
176 int rv;
177 struct ipmi_addr addr;
178 struct kernel_ipmi_msg msg;
179
180 if (req->addr_len > sizeof(struct ipmi_addr))
181 return -EINVAL;
182
183 if (copy_from_user(&addr, req->addr, req->addr_len))
184 return -EFAULT;
185
186 msg.netfn = req->msg.netfn;
187 msg.cmd = req->msg.cmd;
188 msg.data_len = req->msg.data_len;
189 msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
190 if (!msg.data)
191 return -ENOMEM;
192
193
194
195
196 rv = ipmi_validate_addr(&addr, req->addr_len);
197 if (rv)
198 goto out;
199
200 if (req->msg.data != NULL) {
201 if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) {
202 rv = -EMSGSIZE;
203 goto out;
204 }
205
206 if (copy_from_user(msg.data,
207 req->msg.data,
208 req->msg.data_len))
209 {
210 rv = -EFAULT;
211 goto out;
212 }
213 } else {
214 msg.data_len = 0;
215 }
216
217 rv = ipmi_request_settime(user,
218 &addr,
219 req->msgid,
220 &msg,
221 NULL,
222 0,
223 retries,
224 retry_time_ms);
225 out:
226 kfree(msg.data);
227 return rv;
228}
229
230static int ipmi_ioctl(struct file *file,
231 unsigned int cmd,
232 unsigned long data)
233{
234 int rv = -EINVAL;
235 struct ipmi_file_private *priv = file->private_data;
236 void __user *arg = (void __user *)data;
237
238 switch (cmd)
239 {
240 case IPMICTL_SEND_COMMAND:
241 {
242 struct ipmi_req req;
243
244 if (copy_from_user(&req, arg, sizeof(req))) {
245 rv = -EFAULT;
246 break;
247 }
248
249 rv = handle_send_req(priv->user,
250 &req,
251 priv->default_retries,
252 priv->default_retry_time_ms);
253 break;
254 }
255
256 case IPMICTL_SEND_COMMAND_SETTIME:
257 {
258 struct ipmi_req_settime req;
259
260 if (copy_from_user(&req, arg, sizeof(req))) {
261 rv = -EFAULT;
262 break;
263 }
264
265 rv = handle_send_req(priv->user,
266 &req.req,
267 req.retries,
268 req.retry_time_ms);
269 break;
270 }
271
272 case IPMICTL_RECEIVE_MSG:
273 case IPMICTL_RECEIVE_MSG_TRUNC:
274 {
275 struct ipmi_recv rsp;
276 int addr_len;
277 struct list_head *entry;
278 struct ipmi_recv_msg *msg;
279 unsigned long flags;
280
281
282 rv = 0;
283 if (copy_from_user(&rsp, arg, sizeof(rsp))) {
284 rv = -EFAULT;
285 break;
286 }
287
288
289
290
291
292
293
294
295
296 mutex_lock(&priv->recv_mutex);
297
298
299 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
300 if (list_empty(&(priv->recv_msgs))) {
301 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
302 rv = -EAGAIN;
303 goto recv_err;
304 }
305 entry = priv->recv_msgs.next;
306 msg = list_entry(entry, struct ipmi_recv_msg, link);
307 list_del(entry);
308 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
309
310 addr_len = ipmi_addr_length(msg->addr.addr_type);
311 if (rsp.addr_len < addr_len)
312 {
313 rv = -EINVAL;
314 goto recv_putback_on_err;
315 }
316
317 if (copy_to_user(rsp.addr, &(msg->addr), addr_len)) {
318 rv = -EFAULT;
319 goto recv_putback_on_err;
320 }
321 rsp.addr_len = addr_len;
322
323 rsp.recv_type = msg->recv_type;
324 rsp.msgid = msg->msgid;
325 rsp.msg.netfn = msg->msg.netfn;
326 rsp.msg.cmd = msg->msg.cmd;
327
328 if (msg->msg.data_len > 0) {
329 if (rsp.msg.data_len < msg->msg.data_len) {
330 rv = -EMSGSIZE;
331 if (cmd == IPMICTL_RECEIVE_MSG_TRUNC) {
332 msg->msg.data_len = rsp.msg.data_len;
333 } else {
334 goto recv_putback_on_err;
335 }
336 }
337
338 if (copy_to_user(rsp.msg.data,
339 msg->msg.data,
340 msg->msg.data_len))
341 {
342 rv = -EFAULT;
343 goto recv_putback_on_err;
344 }
345 rsp.msg.data_len = msg->msg.data_len;
346 } else {
347 rsp.msg.data_len = 0;
348 }
349
350 if (copy_to_user(arg, &rsp, sizeof(rsp))) {
351 rv = -EFAULT;
352 goto recv_putback_on_err;
353 }
354
355 mutex_unlock(&priv->recv_mutex);
356 ipmi_free_recv_msg(msg);
357 break;
358
359 recv_putback_on_err:
360
361
362 spin_lock_irqsave(&(priv->recv_msg_lock), flags);
363 list_add(entry, &(priv->recv_msgs));
364 spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
365 mutex_unlock(&priv->recv_mutex);
366 break;
367
368 recv_err:
369 mutex_unlock(&priv->recv_mutex);
370 break;
371 }
372
373 case IPMICTL_REGISTER_FOR_CMD:
374 {
375 struct ipmi_cmdspec val;
376
377 if (copy_from_user(&val, arg, sizeof(val))) {
378 rv = -EFAULT;
379 break;
380 }
381
382 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
383 IPMI_CHAN_ALL);
384 break;
385 }
386
387 case IPMICTL_UNREGISTER_FOR_CMD:
388 {
389 struct ipmi_cmdspec val;
390
391 if (copy_from_user(&val, arg, sizeof(val))) {
392 rv = -EFAULT;
393 break;
394 }
395
396 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
397 IPMI_CHAN_ALL);
398 break;
399 }
400
401 case IPMICTL_REGISTER_FOR_CMD_CHANS:
402 {
403 struct ipmi_cmdspec_chans val;
404
405 if (copy_from_user(&val, arg, sizeof(val))) {
406 rv = -EFAULT;
407 break;
408 }
409
410 rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd,
411 val.chans);
412 break;
413 }
414
415 case IPMICTL_UNREGISTER_FOR_CMD_CHANS:
416 {
417 struct ipmi_cmdspec_chans val;
418
419 if (copy_from_user(&val, arg, sizeof(val))) {
420 rv = -EFAULT;
421 break;
422 }
423
424 rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd,
425 val.chans);
426 break;
427 }
428
429 case IPMICTL_SET_GETS_EVENTS_CMD:
430 {
431 int val;
432
433 if (copy_from_user(&val, arg, sizeof(val))) {
434 rv = -EFAULT;
435 break;
436 }
437
438 rv = ipmi_set_gets_events(priv->user, val);
439 break;
440 }
441
442
443 case IPMICTL_SET_MY_ADDRESS_CMD:
444 {
445 unsigned int val;
446
447 if (copy_from_user(&val, arg, sizeof(val))) {
448 rv = -EFAULT;
449 break;
450 }
451
452 rv = ipmi_set_my_address(priv->user, 0, val);
453 break;
454 }
455
456 case IPMICTL_GET_MY_ADDRESS_CMD:
457 {
458 unsigned int val;
459 unsigned char rval;
460
461 rv = ipmi_get_my_address(priv->user, 0, &rval);
462 if (rv)
463 break;
464
465 val = rval;
466
467 if (copy_to_user(arg, &val, sizeof(val))) {
468 rv = -EFAULT;
469 break;
470 }
471 break;
472 }
473
474 case IPMICTL_SET_MY_LUN_CMD:
475 {
476 unsigned int val;
477
478 if (copy_from_user(&val, arg, sizeof(val))) {
479 rv = -EFAULT;
480 break;
481 }
482
483 rv = ipmi_set_my_LUN(priv->user, 0, val);
484 break;
485 }
486
487 case IPMICTL_GET_MY_LUN_CMD:
488 {
489 unsigned int val;
490 unsigned char rval;
491
492 rv = ipmi_get_my_LUN(priv->user, 0, &rval);
493 if (rv)
494 break;
495
496 val = rval;
497
498 if (copy_to_user(arg, &val, sizeof(val))) {
499 rv = -EFAULT;
500 break;
501 }
502 break;
503 }
504
505 case IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD:
506 {
507 struct ipmi_channel_lun_address_set val;
508
509 if (copy_from_user(&val, arg, sizeof(val))) {
510 rv = -EFAULT;
511 break;
512 }
513
514 return ipmi_set_my_address(priv->user, val.channel, val.value);
515 break;
516 }
517
518 case IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD:
519 {
520 struct ipmi_channel_lun_address_set val;
521
522 if (copy_from_user(&val, arg, sizeof(val))) {
523 rv = -EFAULT;
524 break;
525 }
526
527 rv = ipmi_get_my_address(priv->user, val.channel, &val.value);
528 if (rv)
529 break;
530
531 if (copy_to_user(arg, &val, sizeof(val))) {
532 rv = -EFAULT;
533 break;
534 }
535 break;
536 }
537
538 case IPMICTL_SET_MY_CHANNEL_LUN_CMD:
539 {
540 struct ipmi_channel_lun_address_set val;
541
542 if (copy_from_user(&val, arg, sizeof(val))) {
543 rv = -EFAULT;
544 break;
545 }
546
547 rv = ipmi_set_my_LUN(priv->user, val.channel, val.value);
548 break;
549 }
550
551 case IPMICTL_GET_MY_CHANNEL_LUN_CMD:
552 {
553 struct ipmi_channel_lun_address_set val;
554
555 if (copy_from_user(&val, arg, sizeof(val))) {
556 rv = -EFAULT;
557 break;
558 }
559
560 rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value);
561 if (rv)
562 break;
563
564 if (copy_to_user(arg, &val, sizeof(val))) {
565 rv = -EFAULT;
566 break;
567 }
568 break;
569 }
570
571 case IPMICTL_SET_TIMING_PARMS_CMD:
572 {
573 struct ipmi_timing_parms parms;
574
575 if (copy_from_user(&parms, arg, sizeof(parms))) {
576 rv = -EFAULT;
577 break;
578 }
579
580 priv->default_retries = parms.retries;
581 priv->default_retry_time_ms = parms.retry_time_ms;
582 rv = 0;
583 break;
584 }
585
586 case IPMICTL_GET_TIMING_PARMS_CMD:
587 {
588 struct ipmi_timing_parms parms;
589
590 parms.retries = priv->default_retries;
591 parms.retry_time_ms = priv->default_retry_time_ms;
592
593 if (copy_to_user(arg, &parms, sizeof(parms))) {
594 rv = -EFAULT;
595 break;
596 }
597
598 rv = 0;
599 break;
600 }
601
602 case IPMICTL_GET_MAINTENANCE_MODE_CMD:
603 {
604 int mode;
605
606 mode = ipmi_get_maintenance_mode(priv->user);
607 if (copy_to_user(arg, &mode, sizeof(mode))) {
608 rv = -EFAULT;
609 break;
610 }
611 rv = 0;
612 break;
613 }
614
615 case IPMICTL_SET_MAINTENANCE_MODE_CMD:
616 {
617 int mode;
618
619 if (copy_from_user(&mode, arg, sizeof(mode))) {
620 rv = -EFAULT;
621 break;
622 }
623 rv = ipmi_set_maintenance_mode(priv->user, mode);
624 break;
625 }
626 }
627
628 return rv;
629}
630
631
632
633
634
635static long ipmi_unlocked_ioctl(struct file *file,
636 unsigned int cmd,
637 unsigned long data)
638{
639 int ret;
640
641 mutex_lock(&ipmi_mutex);
642 ret = ipmi_ioctl(file, cmd, data);
643 mutex_unlock(&ipmi_mutex);
644
645 return ret;
646}
647
648#ifdef CONFIG_COMPAT
649
650
651
652
653
654
655#define COMPAT_IPMICTL_SEND_COMMAND \
656 _IOR(IPMI_IOC_MAGIC, 13, struct compat_ipmi_req)
657#define COMPAT_IPMICTL_SEND_COMMAND_SETTIME \
658 _IOR(IPMI_IOC_MAGIC, 21, struct compat_ipmi_req_settime)
659#define COMPAT_IPMICTL_RECEIVE_MSG \
660 _IOWR(IPMI_IOC_MAGIC, 12, struct compat_ipmi_recv)
661#define COMPAT_IPMICTL_RECEIVE_MSG_TRUNC \
662 _IOWR(IPMI_IOC_MAGIC, 11, struct compat_ipmi_recv)
663
664struct compat_ipmi_msg {
665 u8 netfn;
666 u8 cmd;
667 u16 data_len;
668 compat_uptr_t data;
669};
670
671struct compat_ipmi_req {
672 compat_uptr_t addr;
673 compat_uint_t addr_len;
674 compat_long_t msgid;
675 struct compat_ipmi_msg msg;
676};
677
678struct compat_ipmi_recv {
679 compat_int_t recv_type;
680 compat_uptr_t addr;
681 compat_uint_t addr_len;
682 compat_long_t msgid;
683 struct compat_ipmi_msg msg;
684};
685
686struct compat_ipmi_req_settime {
687 struct compat_ipmi_req req;
688 compat_int_t retries;
689 compat_uint_t retry_time_ms;
690};
691
692
693
694
695static long get_compat_ipmi_msg(struct ipmi_msg *p64,
696 struct compat_ipmi_msg __user *p32)
697{
698 compat_uptr_t tmp;
699
700 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
701 __get_user(p64->netfn, &p32->netfn) ||
702 __get_user(p64->cmd, &p32->cmd) ||
703 __get_user(p64->data_len, &p32->data_len) ||
704 __get_user(tmp, &p32->data))
705 return -EFAULT;
706 p64->data = compat_ptr(tmp);
707 return 0;
708}
709
710static long put_compat_ipmi_msg(struct ipmi_msg *p64,
711 struct compat_ipmi_msg __user *p32)
712{
713 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
714 __put_user(p64->netfn, &p32->netfn) ||
715 __put_user(p64->cmd, &p32->cmd) ||
716 __put_user(p64->data_len, &p32->data_len))
717 return -EFAULT;
718 return 0;
719}
720
721static long get_compat_ipmi_req(struct ipmi_req *p64,
722 struct compat_ipmi_req __user *p32)
723{
724
725 compat_uptr_t tmp;
726
727 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
728 __get_user(tmp, &p32->addr) ||
729 __get_user(p64->addr_len, &p32->addr_len) ||
730 __get_user(p64->msgid, &p32->msgid) ||
731 get_compat_ipmi_msg(&p64->msg, &p32->msg))
732 return -EFAULT;
733 p64->addr = compat_ptr(tmp);
734 return 0;
735}
736
737static long get_compat_ipmi_req_settime(struct ipmi_req_settime *p64,
738 struct compat_ipmi_req_settime __user *p32)
739{
740 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
741 get_compat_ipmi_req(&p64->req, &p32->req) ||
742 __get_user(p64->retries, &p32->retries) ||
743 __get_user(p64->retry_time_ms, &p32->retry_time_ms))
744 return -EFAULT;
745 return 0;
746}
747
748static long get_compat_ipmi_recv(struct ipmi_recv *p64,
749 struct compat_ipmi_recv __user *p32)
750{
751 compat_uptr_t tmp;
752
753 if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
754 __get_user(p64->recv_type, &p32->recv_type) ||
755 __get_user(tmp, &p32->addr) ||
756 __get_user(p64->addr_len, &p32->addr_len) ||
757 __get_user(p64->msgid, &p32->msgid) ||
758 get_compat_ipmi_msg(&p64->msg, &p32->msg))
759 return -EFAULT;
760 p64->addr = compat_ptr(tmp);
761 return 0;
762}
763
764static long put_compat_ipmi_recv(struct ipmi_recv *p64,
765 struct compat_ipmi_recv __user *p32)
766{
767 if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
768 __put_user(p64->recv_type, &p32->recv_type) ||
769 __put_user(p64->addr_len, &p32->addr_len) ||
770 __put_user(p64->msgid, &p32->msgid) ||
771 put_compat_ipmi_msg(&p64->msg, &p32->msg))
772 return -EFAULT;
773 return 0;
774}
775
776
777
778
779static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
780 unsigned long arg)
781{
782 int rc;
783 struct ipmi_file_private *priv = filep->private_data;
784
785 switch(cmd) {
786 case COMPAT_IPMICTL_SEND_COMMAND:
787 {
788 struct ipmi_req rp;
789
790 if (get_compat_ipmi_req(&rp, compat_ptr(arg)))
791 return -EFAULT;
792
793 return handle_send_req(priv->user, &rp,
794 priv->default_retries,
795 priv->default_retry_time_ms);
796 }
797 case COMPAT_IPMICTL_SEND_COMMAND_SETTIME:
798 {
799 struct ipmi_req_settime sp;
800
801 if (get_compat_ipmi_req_settime(&sp, compat_ptr(arg)))
802 return -EFAULT;
803
804 return handle_send_req(priv->user, &sp.req,
805 sp.retries, sp.retry_time_ms);
806 }
807 case COMPAT_IPMICTL_RECEIVE_MSG:
808 case COMPAT_IPMICTL_RECEIVE_MSG_TRUNC:
809 {
810 struct ipmi_recv __user *precv64;
811 struct ipmi_recv recv64;
812
813 memset(&recv64, 0, sizeof(recv64));
814 if (get_compat_ipmi_recv(&recv64, compat_ptr(arg)))
815 return -EFAULT;
816
817 precv64 = compat_alloc_user_space(sizeof(recv64));
818 if (copy_to_user(precv64, &recv64, sizeof(recv64)))
819 return -EFAULT;
820
821 rc = ipmi_ioctl(filep,
822 ((cmd == COMPAT_IPMICTL_RECEIVE_MSG)
823 ? IPMICTL_RECEIVE_MSG
824 : IPMICTL_RECEIVE_MSG_TRUNC),
825 (unsigned long) precv64);
826 if (rc != 0)
827 return rc;
828
829 if (copy_from_user(&recv64, precv64, sizeof(recv64)))
830 return -EFAULT;
831
832 if (put_compat_ipmi_recv(&recv64, compat_ptr(arg)))
833 return -EFAULT;
834
835 return rc;
836 }
837 default:
838 return ipmi_ioctl(filep, cmd, arg);
839 }
840}
841
842static long unlocked_compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
843 unsigned long arg)
844{
845 int ret;
846
847 mutex_lock(&ipmi_mutex);
848 ret = compat_ipmi_ioctl(filep, cmd, arg);
849 mutex_unlock(&ipmi_mutex);
850
851 return ret;
852}
853#endif
854
855static const struct file_operations ipmi_fops = {
856 .owner = THIS_MODULE,
857 .unlocked_ioctl = ipmi_unlocked_ioctl,
858#ifdef CONFIG_COMPAT
859 .compat_ioctl = unlocked_compat_ipmi_ioctl,
860#endif
861 .open = ipmi_open,
862 .release = ipmi_release,
863 .fasync = ipmi_fasync,
864 .poll = ipmi_poll,
865 .llseek = noop_llseek,
866};
867
868#define DEVICE_NAME "ipmidev"
869
870static int ipmi_major;
871module_param(ipmi_major, int, 0);
872MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device. By"
873 " default, or if you set it to zero, it will choose the next"
874 " available device. Setting it to -1 will disable the"
875 " interface. Other values will set the major device number"
876 " to that value.");
877
878
879struct ipmi_reg_list {
880 dev_t dev;
881 struct list_head link;
882};
883static LIST_HEAD(reg_list);
884static DEFINE_MUTEX(reg_list_mutex);
885
886static struct class *ipmi_class;
887
888static void ipmi_new_smi(int if_num, struct device *device)
889{
890 dev_t dev = MKDEV(ipmi_major, if_num);
891 struct ipmi_reg_list *entry;
892
893 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
894 if (!entry) {
895 printk(KERN_ERR "ipmi_devintf: Unable to create the"
896 " ipmi class device link\n");
897 return;
898 }
899 entry->dev = dev;
900
901 mutex_lock(®_list_mutex);
902 device_create(ipmi_class, device, dev, NULL, "ipmi%d", if_num);
903 list_add(&entry->link, ®_list);
904 mutex_unlock(®_list_mutex);
905}
906
907static void ipmi_smi_gone(int if_num)
908{
909 dev_t dev = MKDEV(ipmi_major, if_num);
910 struct ipmi_reg_list *entry;
911
912 mutex_lock(®_list_mutex);
913 list_for_each_entry(entry, ®_list, link) {
914 if (entry->dev == dev) {
915 list_del(&entry->link);
916 kfree(entry);
917 break;
918 }
919 }
920 device_destroy(ipmi_class, dev);
921 mutex_unlock(®_list_mutex);
922}
923
924static struct ipmi_smi_watcher smi_watcher =
925{
926 .owner = THIS_MODULE,
927 .new_smi = ipmi_new_smi,
928 .smi_gone = ipmi_smi_gone,
929};
930
931static int __init init_ipmi_devintf(void)
932{
933 int rv;
934
935 if (ipmi_major < 0)
936 return -EINVAL;
937
938 printk(KERN_INFO "ipmi device interface\n");
939
940 ipmi_class = class_create(THIS_MODULE, "ipmi");
941 if (IS_ERR(ipmi_class)) {
942 printk(KERN_ERR "ipmi: can't register device class\n");
943 return PTR_ERR(ipmi_class);
944 }
945
946 rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops);
947 if (rv < 0) {
948 class_destroy(ipmi_class);
949 printk(KERN_ERR "ipmi: can't get major %d\n", ipmi_major);
950 return rv;
951 }
952
953 if (ipmi_major == 0) {
954 ipmi_major = rv;
955 }
956
957 rv = ipmi_smi_watcher_register(&smi_watcher);
958 if (rv) {
959 unregister_chrdev(ipmi_major, DEVICE_NAME);
960 class_destroy(ipmi_class);
961 printk(KERN_WARNING "ipmi: can't register smi watcher\n");
962 return rv;
963 }
964
965 return 0;
966}
967module_init(init_ipmi_devintf);
968
969static void __exit cleanup_ipmi(void)
970{
971 struct ipmi_reg_list *entry, *entry2;
972 mutex_lock(®_list_mutex);
973 list_for_each_entry_safe(entry, entry2, ®_list, link) {
974 list_del(&entry->link);
975 device_destroy(ipmi_class, entry->dev);
976 kfree(entry);
977 }
978 mutex_unlock(®_list_mutex);
979 class_destroy(ipmi_class);
980 ipmi_smi_watcher_unregister(&smi_watcher);
981 unregister_chrdev(ipmi_major, DEVICE_NAME);
982}
983module_exit(cleanup_ipmi);
984
985MODULE_LICENSE("GPL");
986MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
987MODULE_DESCRIPTION("Linux device interface for the IPMI message handler.");
988MODULE_ALIAS("platform:ipmi_si");
989
