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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / char / ipmi / ipmi_ssif.c
blobca9528c4f183e7ea57cb71805b5a09aaf3bedd69
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * ipmi_ssif.c
4 *
5 * The interface to the IPMI driver for SMBus access to a SMBus
6 * compliant device. Called SSIF by the IPMI spec.
7 *
8 * Author: Intel Corporation
9 * Todd Davis <todd.c.davis@intel.com>
10 *
11 * Rewritten by Corey Minyard <minyard@acm.org> to support the
12 * non-blocking I2C interface, add support for multi-part
13 * transactions, add PEC support, and general clenaup.
14 *
15 * Copyright 2003 Intel Corporation
16 * Copyright 2005 MontaVista Software
17 */
18
19 /*
20 * This file holds the "policy" for the interface to the SSIF state
21 * machine. It does the configuration, handles timers and interrupts,
22 * and drives the real SSIF state machine.
23 */
24
25 /*
26 * TODO: Figure out how to use SMB alerts. This will require a new
27 * interface into the I2C driver, I believe.
28 */
29
30 #define pr_fmt(fmt) "ipmi_ssif: " fmt
31
32 #if defined(MODVERSIONS)
33 #include <linux/modversions.h>
34 #endif
35
36 #include <linux/module.h>
37 #include <linux/moduleparam.h>
38 #include <linux/sched.h>
39 #include <linux/seq_file.h>
40 #include <linux/timer.h>
41 #include <linux/delay.h>
42 #include <linux/errno.h>
43 #include <linux/spinlock.h>
44 #include <linux/slab.h>
45 #include <linux/list.h>
46 #include <linux/i2c.h>
47 #include <linux/ipmi_smi.h>
48 #include <linux/init.h>
49 #include <linux/dmi.h>
50 #include <linux/kthread.h>
51 #include <linux/acpi.h>
52 #include <linux/ctype.h>
53 #include <linux/time64.h>
54 #include "ipmi_si_sm.h"
55 #include "ipmi_dmi.h"
56
57 #define DEVICE_NAME "ipmi_ssif"
58
59 #define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57
60
61 #define SSIF_IPMI_REQUEST 2
62 #define SSIF_IPMI_MULTI_PART_REQUEST_START 6
63 #define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7
64 #define SSIF_IPMI_MULTI_PART_REQUEST_END 8
65 #define SSIF_IPMI_RESPONSE 3
66 #define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9
67
68 /* ssif_debug is a bit-field
69 * SSIF_DEBUG_MSG - commands and their responses
70 * SSIF_DEBUG_STATES - message states
71 * SSIF_DEBUG_TIMING - Measure times between events in the driver
72 */
73 #define SSIF_DEBUG_TIMING 4
74 #define SSIF_DEBUG_STATE 2
75 #define SSIF_DEBUG_MSG 1
76 #define SSIF_NODEBUG 0
77 #define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG)
78
79 /*
80 * Timer values
81 */
82 #define SSIF_MSG_USEC 20000 /* 20ms between message tries. */
83 #define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */
84
85 /* How many times to we retry sending/receiving the message. */
86 #define SSIF_SEND_RETRIES 5
87 #define SSIF_RECV_RETRIES 250
88
89 #define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000)
90 #define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC)
91 #define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC)
92
93 enum ssif_intf_state {
94 SSIF_NORMAL,
95 SSIF_GETTING_FLAGS,
96 SSIF_GETTING_EVENTS,
97 SSIF_CLEARING_FLAGS,
98 SSIF_GETTING_MESSAGES,
99 /* FIXME - add watchdog stuff. */
100 };
101
102 #define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \
103 && (ssif)->curr_msg == NULL)
104
105 /*
106 * Indexes into stats[] in ssif_info below.
107 */
108 enum ssif_stat_indexes {
109 /* Number of total messages sent. */
110 SSIF_STAT_sent_messages = 0,
111
112 /*
113 * Number of message parts sent. Messages may be broken into
114 * parts if they are long.
115 */
116 SSIF_STAT_sent_messages_parts,
117
118 /*
119 * Number of time a message was retried.
120 */
121 SSIF_STAT_send_retries,
122
123 /*
124 * Number of times the send of a message failed.
125 */
126 SSIF_STAT_send_errors,
127
128 /*
129 * Number of message responses received.
130 */
131 SSIF_STAT_received_messages,
132
133 /*
134 * Number of message fragments received.
135 */
136 SSIF_STAT_received_message_parts,
137
138 /*
139 * Number of times the receive of a message was retried.
140 */
141 SSIF_STAT_receive_retries,
142
143 /*
144 * Number of errors receiving messages.
145 */
146 SSIF_STAT_receive_errors,
147
148 /*
149 * Number of times a flag fetch was requested.
150 */
151 SSIF_STAT_flag_fetches,
152
153 /*
154 * Number of times the hardware didn't follow the state machine.
155 */
156 SSIF_STAT_hosed,
157
158 /*
159 * Number of received events.
160 */
161 SSIF_STAT_events,
162
163 /* Number of asyncronous messages received. */
164 SSIF_STAT_incoming_messages,
165
166 /* Number of watchdog pretimeouts. */
167 SSIF_STAT_watchdog_pretimeouts,
168
169 /* Number of alers received. */
170 SSIF_STAT_alerts,
171
172 /* Always add statistics before this value, it must be last. */
173 SSIF_NUM_STATS
174 };
175
176 struct ssif_addr_info {
177 struct i2c_board_info binfo;
178 char *adapter_name;
179 int debug;
180 int slave_addr;
181 enum ipmi_addr_src addr_src;
182 union ipmi_smi_info_union addr_info;
183 struct device *dev;
184 struct i2c_client *client;
185
186 struct i2c_client *added_client;
187
188 struct mutex clients_mutex;
189 struct list_head clients;
190
191 struct list_head link;
192 };
193
194 struct ssif_info;
195
196 typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result,
197 unsigned char *data, unsigned int len);
198
199 struct ssif_info {
200 struct ipmi_smi *intf;
201 spinlock_t lock;
202 struct ipmi_smi_msg *waiting_msg;
203 struct ipmi_smi_msg *curr_msg;
204 enum ssif_intf_state ssif_state;
205 unsigned long ssif_debug;
206
207 struct ipmi_smi_handlers handlers;
208
209 enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
210 union ipmi_smi_info_union addr_info;
211
212 /*
213 * Flags from the last GET_MSG_FLAGS command, used when an ATTN
214 * is set to hold the flags until we are done handling everything
215 * from the flags.
216 */
217 #define RECEIVE_MSG_AVAIL 0x01
218 #define EVENT_MSG_BUFFER_FULL 0x02
219 #define WDT_PRE_TIMEOUT_INT 0x08
220 unsigned char msg_flags;
221
222 u8 global_enables;
223 bool has_event_buffer;
224 bool supports_alert;
225
226 /*
227 * Used to tell what we should do with alerts. If we are
228 * waiting on a response, read the data immediately.
229 */
230 bool got_alert;
231 bool waiting_alert;
232
233 /*
234 * If set to true, this will request events the next time the
235 * state machine is idle.
236 */
237 bool req_events;
238
239 /*
240 * If set to true, this will request flags the next time the
241 * state machine is idle.
242 */
243 bool req_flags;
244
245 /*
246 * Used to perform timer operations when run-to-completion
247 * mode is on. This is a countdown timer.
248 */
249 int rtc_us_timer;
250
251 /* Used for sending/receiving data. +1 for the length. */
252 unsigned char data[IPMI_MAX_MSG_LENGTH + 1];
253 unsigned int data_len;
254
255 /* Temp receive buffer, gets copied into data. */
256 unsigned char recv[I2C_SMBUS_BLOCK_MAX];
257
258 struct i2c_client *client;
259 ssif_i2c_done done_handler;
260
261 /* Thread interface handling */
262 struct task_struct *thread;
263 struct completion wake_thread;
264 bool stopping;
265 int i2c_read_write;
266 int i2c_command;
267 unsigned char *i2c_data;
268 unsigned int i2c_size;
269
270 struct timer_list retry_timer;
271 int retries_left;
272
273 /* Info from SSIF cmd */
274 unsigned char max_xmit_msg_size;
275 unsigned char max_recv_msg_size;
276 bool cmd8_works; /* See test_multipart_messages() for details. */
277 unsigned int multi_support;
278 int supports_pec;
279
280 #define SSIF_NO_MULTI 0
281 #define SSIF_MULTI_2_PART 1
282 #define SSIF_MULTI_n_PART 2
283 unsigned char *multi_data;
284 unsigned int multi_len;
285 unsigned int multi_pos;
286
287 atomic_t stats[SSIF_NUM_STATS];
288 };
289
290 #define ssif_inc_stat(ssif, stat) \
291 atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat])
292 #define ssif_get_stat(ssif, stat) \
293 ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
294
295 static bool initialized;
296
297 static void return_hosed_msg(struct ssif_info *ssif_info,
298 struct ipmi_smi_msg *msg);
299 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags);
300 static int start_send(struct ssif_info *ssif_info,
301 unsigned char *data,
302 unsigned int len);
303
304 static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info,
305 unsigned long *flags)
306 {
307 spin_lock_irqsave(&ssif_info->lock, *flags);
308 return flags;
309 }
310
311 static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info,
312 unsigned long *flags)
313 {
314 spin_unlock_irqrestore(&ssif_info->lock, *flags);
315 }
316
317 static void deliver_recv_msg(struct ssif_info *ssif_info,
318 struct ipmi_smi_msg *msg)
319 {
320 if (msg->rsp_size < 0) {
321 return_hosed_msg(ssif_info, msg);
322 pr_err("%s: Malformed message: rsp_size = %d\n",
323 __func__, msg->rsp_size);
324 } else {
325 ipmi_smi_msg_received(ssif_info->intf, msg);
326 }
327 }
328
329 static void return_hosed_msg(struct ssif_info *ssif_info,
330 struct ipmi_smi_msg *msg)
331 {
332 ssif_inc_stat(ssif_info, hosed);
333
334 /* Make it a response */
335 msg->rsp[0] = msg->data[0] | 4;
336 msg->rsp[1] = msg->data[1];
337 msg->rsp[2] = 0xFF; /* Unknown error. */
338 msg->rsp_size = 3;
339
340 deliver_recv_msg(ssif_info, msg);
341 }
342
343 /*
344 * Must be called with the message lock held. This will release the
345 * message lock. Note that the caller will check SSIF_IDLE and start a
346 * new operation, so there is no need to check for new messages to
347 * start in here.
348 */
349 static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags)
350 {
351 unsigned char msg[3];
352
353 ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
354 ssif_info->ssif_state = SSIF_CLEARING_FLAGS;
355 ipmi_ssif_unlock_cond(ssif_info, flags);
356
357 /* Make sure the watchdog pre-timeout flag is not set at startup. */
358 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
359 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
360 msg[2] = WDT_PRE_TIMEOUT_INT;
361
362 if (start_send(ssif_info, msg, 3) != 0) {
363 /* Error, just go to normal state. */
364 ssif_info->ssif_state = SSIF_NORMAL;
365 }
366 }
367
368 static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags)
369 {
370 unsigned char mb[2];
371
372 ssif_info->req_flags = false;
373 ssif_info->ssif_state = SSIF_GETTING_FLAGS;
374 ipmi_ssif_unlock_cond(ssif_info, flags);
375
376 mb[0] = (IPMI_NETFN_APP_REQUEST << 2);
377 mb[1] = IPMI_GET_MSG_FLAGS_CMD;
378 if (start_send(ssif_info, mb, 2) != 0)
379 ssif_info->ssif_state = SSIF_NORMAL;
380 }
381
382 static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags,
383 struct ipmi_smi_msg *msg)
384 {
385 if (start_send(ssif_info, msg->data, msg->data_size) != 0) {
386 unsigned long oflags;
387
388 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
389 ssif_info->curr_msg = NULL;
390 ssif_info->ssif_state = SSIF_NORMAL;
391 ipmi_ssif_unlock_cond(ssif_info, flags);
392 ipmi_free_smi_msg(msg);
393 }
394 }
395
396 static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags)
397 {
398 struct ipmi_smi_msg *msg;
399
400 ssif_info->req_events = false;
401
402 msg = ipmi_alloc_smi_msg();
403 if (!msg) {
404 ssif_info->ssif_state = SSIF_NORMAL;
405 ipmi_ssif_unlock_cond(ssif_info, flags);
406 return;
407 }
408
409 ssif_info->curr_msg = msg;
410 ssif_info->ssif_state = SSIF_GETTING_EVENTS;
411 ipmi_ssif_unlock_cond(ssif_info, flags);
412
413 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
414 msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
415 msg->data_size = 2;
416
417 check_start_send(ssif_info, flags, msg);
418 }
419
420 static void start_recv_msg_fetch(struct ssif_info *ssif_info,
421 unsigned long *flags)
422 {
423 struct ipmi_smi_msg *msg;
424
425 msg = ipmi_alloc_smi_msg();
426 if (!msg) {
427 ssif_info->ssif_state = SSIF_NORMAL;
428 ipmi_ssif_unlock_cond(ssif_info, flags);
429 return;
430 }
431
432 ssif_info->curr_msg = msg;
433 ssif_info->ssif_state = SSIF_GETTING_MESSAGES;
434 ipmi_ssif_unlock_cond(ssif_info, flags);
435
436 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
437 msg->data[1] = IPMI_GET_MSG_CMD;
438 msg->data_size = 2;
439
440 check_start_send(ssif_info, flags, msg);
441 }
442
443 /*
444 * Must be called with the message lock held. This will release the
445 * message lock. Note that the caller will check SSIF_IDLE and start a
446 * new operation, so there is no need to check for new messages to
447 * start in here.
448 */
449 static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags)
450 {
451 if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
452 /* Watchdog pre-timeout */
453 ssif_inc_stat(ssif_info, watchdog_pretimeouts);
454 start_clear_flags(ssif_info, flags);
455 ipmi_smi_watchdog_pretimeout(ssif_info->intf);
456 } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL)
457 /* Messages available. */
458 start_recv_msg_fetch(ssif_info, flags);
459 else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL)
460 /* Events available. */
461 start_event_fetch(ssif_info, flags);
462 else {
463 ssif_info->ssif_state = SSIF_NORMAL;
464 ipmi_ssif_unlock_cond(ssif_info, flags);
465 }
466 }
467
468 static int ipmi_ssif_thread(void *data)
469 {
470 struct ssif_info *ssif_info = data;
471
472 while (!kthread_should_stop()) {
473 int result;
474
475 /* Wait for something to do */
476 result = wait_for_completion_interruptible(
477 &ssif_info->wake_thread);
478 if (ssif_info->stopping)
479 break;
480 if (result == -ERESTARTSYS)
481 continue;
482 init_completion(&ssif_info->wake_thread);
483
484 if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) {
485 result = i2c_smbus_write_block_data(
486 ssif_info->client, ssif_info->i2c_command,
487 ssif_info->i2c_data[0],
488 ssif_info->i2c_data + 1);
489 ssif_info->done_handler(ssif_info, result, NULL, 0);
490 } else {
491 result = i2c_smbus_read_block_data(
492 ssif_info->client, ssif_info->i2c_command,
493 ssif_info->i2c_data);
494 if (result < 0)
495 ssif_info->done_handler(ssif_info, result,
496 NULL, 0);
497 else
498 ssif_info->done_handler(ssif_info, 0,
499 ssif_info->i2c_data,
500 result);
501 }
502 }
503
504 return 0;
505 }
506
507 static int ssif_i2c_send(struct ssif_info *ssif_info,
508 ssif_i2c_done handler,
509 int read_write, int command,
510 unsigned char *data, unsigned int size)
511 {
512 ssif_info->done_handler = handler;
513
514 ssif_info->i2c_read_write = read_write;
515 ssif_info->i2c_command = command;
516 ssif_info->i2c_data = data;
517 ssif_info->i2c_size = size;
518 complete(&ssif_info->wake_thread);
519 return 0;
520 }
521
522
523 static void msg_done_handler(struct ssif_info *ssif_info, int result,
524 unsigned char *data, unsigned int len);
525
526 static void start_get(struct ssif_info *ssif_info)
527 {
528 int rv;
529
530 ssif_info->rtc_us_timer = 0;
531 ssif_info->multi_pos = 0;
532
533 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
534 SSIF_IPMI_RESPONSE,
535 ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
536 if (rv < 0) {
537 /* request failed, just return the error. */
538 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
539 pr_info("Error from i2c_non_blocking_op(5)\n");
540
541 msg_done_handler(ssif_info, -EIO, NULL, 0);
542 }
543 }
544
545 static void retry_timeout(struct timer_list *t)
546 {
547 struct ssif_info *ssif_info = from_timer(ssif_info, t, retry_timer);
548 unsigned long oflags, *flags;
549 bool waiting;
550
551 if (ssif_info->stopping)
552 return;
553
554 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
555 waiting = ssif_info->waiting_alert;
556 ssif_info->waiting_alert = false;
557 ipmi_ssif_unlock_cond(ssif_info, flags);
558
559 if (waiting)
560 start_get(ssif_info);
561 }
562
563
564 static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type,
565 unsigned int data)
566 {
567 struct ssif_info *ssif_info = i2c_get_clientdata(client);
568 unsigned long oflags, *flags;
569 bool do_get = false;
570
571 if (type != I2C_PROTOCOL_SMBUS_ALERT)
572 return;
573
574 ssif_inc_stat(ssif_info, alerts);
575
576 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
577 if (ssif_info->waiting_alert) {
578 ssif_info->waiting_alert = false;
579 del_timer(&ssif_info->retry_timer);
580 do_get = true;
581 } else if (ssif_info->curr_msg) {
582 ssif_info->got_alert = true;
583 }
584 ipmi_ssif_unlock_cond(ssif_info, flags);
585 if (do_get)
586 start_get(ssif_info);
587 }
588
589 static int start_resend(struct ssif_info *ssif_info);
590
591 static void msg_done_handler(struct ssif_info *ssif_info, int result,
592 unsigned char *data, unsigned int len)
593 {
594 struct ipmi_smi_msg *msg;
595 unsigned long oflags, *flags;
596 int rv;
597
598 /*
599 * We are single-threaded here, so no need for a lock until we
600 * start messing with driver states or the queues.
601 */
602
603 if (result < 0) {
604 ssif_info->retries_left--;
605 if (ssif_info->retries_left > 0) {
606 ssif_inc_stat(ssif_info, receive_retries);
607
608 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
609 ssif_info->waiting_alert = true;
610 ssif_info->rtc_us_timer = SSIF_MSG_USEC;
611 if (!ssif_info->stopping)
612 mod_timer(&ssif_info->retry_timer,
613 jiffies + SSIF_MSG_JIFFIES);
614 ipmi_ssif_unlock_cond(ssif_info, flags);
615 return;
616 }
617
618 ssif_inc_stat(ssif_info, receive_errors);
619
620 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
621 pr_info("Error in msg_done_handler: %d\n", result);
622 len = 0;
623 goto continue_op;
624 }
625
626 if ((len > 1) && (ssif_info->multi_pos == 0)
627 && (data[0] == 0x00) && (data[1] == 0x01)) {
628 /* Start of multi-part read. Start the next transaction. */
629 int i;
630
631 ssif_inc_stat(ssif_info, received_message_parts);
632
633 /* Remove the multi-part read marker. */
634 len -= 2;
635 for (i = 0; i < len; i++)
636 ssif_info->data[i] = data[i+2];
637 ssif_info->multi_len = len;
638 ssif_info->multi_pos = 1;
639
640 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
641 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
642 ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
643 if (rv < 0) {
644 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
645 pr_info("Error from i2c_non_blocking_op(1)\n");
646
647 result = -EIO;
648 } else
649 return;
650 } else if (ssif_info->multi_pos) {
651 /* Middle of multi-part read. Start the next transaction. */
652 int i;
653 unsigned char blocknum;
654
655 if (len == 0) {
656 result = -EIO;
657 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
658 pr_info("Middle message with no data\n");
659
660 goto continue_op;
661 }
662
663 blocknum = data[0];
664
665 if (ssif_info->multi_len + len - 1 > IPMI_MAX_MSG_LENGTH) {
666 /* Received message too big, abort the operation. */
667 result = -E2BIG;
668 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
669 pr_info("Received message too big\n");
670
671 goto continue_op;
672 }
673
674 /* Remove the blocknum from the data. */
675 len--;
676 for (i = 0; i < len; i++)
677 ssif_info->data[i + ssif_info->multi_len] = data[i + 1];
678 ssif_info->multi_len += len;
679 if (blocknum == 0xff) {
680 /* End of read */
681 len = ssif_info->multi_len;
682 data = ssif_info->data;
683 } else if (blocknum + 1 != ssif_info->multi_pos) {
684 /*
685 * Out of sequence block, just abort. Block
686 * numbers start at zero for the second block,
687 * but multi_pos starts at one, so the +1.
688 */
689 result = -EIO;
690 } else {
691 ssif_inc_stat(ssif_info, received_message_parts);
692
693 ssif_info->multi_pos++;
694
695 rv = ssif_i2c_send(ssif_info, msg_done_handler,
696 I2C_SMBUS_READ,
697 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
698 ssif_info->recv,
699 I2C_SMBUS_BLOCK_DATA);
700 if (rv < 0) {
701 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
702 pr_info("Error from ssif_i2c_send\n");
703
704 result = -EIO;
705 } else
706 return;
707 }
708 }
709
710 if (result < 0) {
711 ssif_inc_stat(ssif_info, receive_errors);
712 } else {
713 ssif_inc_stat(ssif_info, received_messages);
714 ssif_inc_stat(ssif_info, received_message_parts);
715 }
716
717
718 continue_op:
719 if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
720 pr_info("DONE 1: state = %d, result=%d\n",
721 ssif_info->ssif_state, result);
722
723 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
724 msg = ssif_info->curr_msg;
725 if (msg) {
726 msg->rsp_size = len;
727 if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
728 msg->rsp_size = IPMI_MAX_MSG_LENGTH;
729 memcpy(msg->rsp, data, msg->rsp_size);
730 ssif_info->curr_msg = NULL;
731 }
732
733 switch (ssif_info->ssif_state) {
734 case SSIF_NORMAL:
735 ipmi_ssif_unlock_cond(ssif_info, flags);
736 if (!msg)
737 break;
738
739 if (result < 0)
740 return_hosed_msg(ssif_info, msg);
741 else
742 deliver_recv_msg(ssif_info, msg);
743 break;
744
745 case SSIF_GETTING_FLAGS:
746 /* We got the flags from the SSIF, now handle them. */
747 if ((result < 0) || (len < 4) || (data[2] != 0)) {
748 /*
749 * Error fetching flags, or invalid length,
750 * just give up for now.
751 */
752 ssif_info->ssif_state = SSIF_NORMAL;
753 ipmi_ssif_unlock_cond(ssif_info, flags);
754 pr_warn("Error getting flags: %d %d, %x\n",
755 result, len, (len >= 3) ? data[2] : 0);
756 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
757 || data[1] != IPMI_GET_MSG_FLAGS_CMD) {
758 /*
759 * Don't abort here, maybe it was a queued
760 * response to a previous command.
761 */
762 ipmi_ssif_unlock_cond(ssif_info, flags);
763 pr_warn("Invalid response getting flags: %x %x\n",
764 data[0], data[1]);
765 } else {
766 ssif_inc_stat(ssif_info, flag_fetches);
767 ssif_info->msg_flags = data[3];
768 handle_flags(ssif_info, flags);
769 }
770 break;
771
772 case SSIF_CLEARING_FLAGS:
773 /* We cleared the flags. */
774 if ((result < 0) || (len < 3) || (data[2] != 0)) {
775 /* Error clearing flags */
776 pr_warn("Error clearing flags: %d %d, %x\n",
777 result, len, (len >= 3) ? data[2] : 0);
778 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
779 || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) {
780 pr_warn("Invalid response clearing flags: %x %x\n",
781 data[0], data[1]);
782 }
783 ssif_info->ssif_state = SSIF_NORMAL;
784 ipmi_ssif_unlock_cond(ssif_info, flags);
785 break;
786
787 case SSIF_GETTING_EVENTS:
788 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
789 /* Error getting event, probably done. */
790 msg->done(msg);
791
792 /* Take off the event flag. */
793 ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
794 handle_flags(ssif_info, flags);
795 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
796 || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) {
797 pr_warn("Invalid response getting events: %x %x\n",
798 msg->rsp[0], msg->rsp[1]);
799 msg->done(msg);
800 /* Take off the event flag. */
801 ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
802 handle_flags(ssif_info, flags);
803 } else {
804 handle_flags(ssif_info, flags);
805 ssif_inc_stat(ssif_info, events);
806 deliver_recv_msg(ssif_info, msg);
807 }
808 break;
809
810 case SSIF_GETTING_MESSAGES:
811 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
812 /* Error getting event, probably done. */
813 msg->done(msg);
814
815 /* Take off the msg flag. */
816 ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
817 handle_flags(ssif_info, flags);
818 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
819 || msg->rsp[1] != IPMI_GET_MSG_CMD) {
820 pr_warn("Invalid response clearing flags: %x %x\n",
821 msg->rsp[0], msg->rsp[1]);
822 msg->done(msg);
823
824 /* Take off the msg flag. */
825 ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
826 handle_flags(ssif_info, flags);
827 } else {
828 ssif_inc_stat(ssif_info, incoming_messages);
829 handle_flags(ssif_info, flags);
830 deliver_recv_msg(ssif_info, msg);
831 }
832 break;
833 }
834
835 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
836 if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) {
837 if (ssif_info->req_events)
838 start_event_fetch(ssif_info, flags);
839 else if (ssif_info->req_flags)
840 start_flag_fetch(ssif_info, flags);
841 else
842 start_next_msg(ssif_info, flags);
843 } else
844 ipmi_ssif_unlock_cond(ssif_info, flags);
845
846 if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
847 pr_info("DONE 2: state = %d.\n", ssif_info->ssif_state);
848 }
849
850 static void msg_written_handler(struct ssif_info *ssif_info, int result,
851 unsigned char *data, unsigned int len)
852 {
853 int rv;
854
855 /* We are single-threaded here, so no need for a lock. */
856 if (result < 0) {
857 ssif_info->retries_left--;
858 if (ssif_info->retries_left > 0) {
859 if (!start_resend(ssif_info)) {
860 ssif_inc_stat(ssif_info, send_retries);
861 return;
862 }
863 /* request failed, just return the error. */
864 ssif_inc_stat(ssif_info, send_errors);
865
866 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
867 pr_info("%s: Out of retries\n", __func__);
868 msg_done_handler(ssif_info, -EIO, NULL, 0);
869 return;
870 }
871
872 ssif_inc_stat(ssif_info, send_errors);
873
874 /*
875 * Got an error on transmit, let the done routine
876 * handle it.
877 */
878 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
879 pr_info("Error in msg_written_handler: %d\n", result);
880
881 msg_done_handler(ssif_info, result, NULL, 0);
882 return;
883 }
884
885 if (ssif_info->multi_data) {
886 /*
887 * In the middle of a multi-data write. See the comment
888 * in the SSIF_MULTI_n_PART case in the probe function
889 * for details on the intricacies of this.
890 */
891 int left, to_write;
892 unsigned char *data_to_send;
893 unsigned char cmd;
894
895 ssif_inc_stat(ssif_info, sent_messages_parts);
896
897 left = ssif_info->multi_len - ssif_info->multi_pos;
898 to_write = left;
899 if (to_write > 32)
900 to_write = 32;
901 /* Length byte. */
902 ssif_info->multi_data[ssif_info->multi_pos] = to_write;
903 data_to_send = ssif_info->multi_data + ssif_info->multi_pos;
904 ssif_info->multi_pos += to_write;
905 cmd = SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE;
906 if (ssif_info->cmd8_works) {
907 if (left == to_write) {
908 cmd = SSIF_IPMI_MULTI_PART_REQUEST_END;
909 ssif_info->multi_data = NULL;
910 }
911 } else if (to_write < 32) {
912 ssif_info->multi_data = NULL;
913 }
914
915 rv = ssif_i2c_send(ssif_info, msg_written_handler,
916 I2C_SMBUS_WRITE, cmd,
917 data_to_send, I2C_SMBUS_BLOCK_DATA);
918 if (rv < 0) {
919 /* request failed, just return the error. */
920 ssif_inc_stat(ssif_info, send_errors);
921
922 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
923 pr_info("Error from i2c_non_blocking_op(3)\n");
924 msg_done_handler(ssif_info, -EIO, NULL, 0);
925 }
926 } else {
927 /* Ready to request the result. */
928 unsigned long oflags, *flags;
929
930 ssif_inc_stat(ssif_info, sent_messages);
931 ssif_inc_stat(ssif_info, sent_messages_parts);
932
933 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
934 if (ssif_info->got_alert) {
935 /* The result is already ready, just start it. */
936 ssif_info->got_alert = false;
937 ipmi_ssif_unlock_cond(ssif_info, flags);
938 start_get(ssif_info);
939 } else {
940 /* Wait a jiffie then request the next message */
941 ssif_info->waiting_alert = true;
942 ssif_info->retries_left = SSIF_RECV_RETRIES;
943 ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC;
944 if (!ssif_info->stopping)
945 mod_timer(&ssif_info->retry_timer,
946 jiffies + SSIF_MSG_PART_JIFFIES);
947 ipmi_ssif_unlock_cond(ssif_info, flags);
948 }
949 }
950 }
951
952 static int start_resend(struct ssif_info *ssif_info)
953 {
954 int rv;
955 int command;
956
957 ssif_info->got_alert = false;
958
959 if (ssif_info->data_len > 32) {
960 command = SSIF_IPMI_MULTI_PART_REQUEST_START;
961 ssif_info->multi_data = ssif_info->data;
962 ssif_info->multi_len = ssif_info->data_len;
963 /*
964 * Subtle thing, this is 32, not 33, because we will
965 * overwrite the thing at position 32 (which was just
966 * transmitted) with the new length.
967 */
968 ssif_info->multi_pos = 32;
969 ssif_info->data[0] = 32;
970 } else {
971 ssif_info->multi_data = NULL;
972 command = SSIF_IPMI_REQUEST;
973 ssif_info->data[0] = ssif_info->data_len;
974 }
975
976 rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
977 command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
978 if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG))
979 pr_info("Error from i2c_non_blocking_op(4)\n");
980 return rv;
981 }
982
983 static int start_send(struct ssif_info *ssif_info,
984 unsigned char *data,
985 unsigned int len)
986 {
987 if (len > IPMI_MAX_MSG_LENGTH)
988 return -E2BIG;
989 if (len > ssif_info->max_xmit_msg_size)
990 return -E2BIG;
991
992 ssif_info->retries_left = SSIF_SEND_RETRIES;
993 memcpy(ssif_info->data + 1, data, len);
994 ssif_info->data_len = len;
995 return start_resend(ssif_info);
996 }
997
998 /* Must be called with the message lock held. */
999 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags)
1000 {
1001 struct ipmi_smi_msg *msg;
1002 unsigned long oflags;
1003
1004 restart:
1005 if (!SSIF_IDLE(ssif_info)) {
1006 ipmi_ssif_unlock_cond(ssif_info, flags);
1007 return;
1008 }
1009
1010 if (!ssif_info->waiting_msg) {
1011 ssif_info->curr_msg = NULL;
1012 ipmi_ssif_unlock_cond(ssif_info, flags);
1013 } else {
1014 int rv;
1015
1016 ssif_info->curr_msg = ssif_info->waiting_msg;
1017 ssif_info->waiting_msg = NULL;
1018 ipmi_ssif_unlock_cond(ssif_info, flags);
1019 rv = start_send(ssif_info,
1020 ssif_info->curr_msg->data,
1021 ssif_info->curr_msg->data_size);
1022 if (rv) {
1023 msg = ssif_info->curr_msg;
1024 ssif_info->curr_msg = NULL;
1025 return_hosed_msg(ssif_info, msg);
1026 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1027 goto restart;
1028 }
1029 }
1030 }
1031
1032 static void sender(void *send_info,
1033 struct ipmi_smi_msg *msg)
1034 {
1035 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1036 unsigned long oflags, *flags;
1037
1038 BUG_ON(ssif_info->waiting_msg);
1039 ssif_info->waiting_msg = msg;
1040
1041 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1042 start_next_msg(ssif_info, flags);
1043
1044 if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) {
1045 struct timespec64 t;
1046
1047 ktime_get_real_ts64(&t);
1048 pr_info("**Enqueue %02x %02x: %lld.%6.6ld\n",
1049 msg->data[0], msg->data[1],
1050 (long long)t.tv_sec, (long)t.tv_nsec / NSEC_PER_USEC);
1051 }
1052 }
1053
1054 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1055 {
1056 struct ssif_info *ssif_info = send_info;
1057
1058 data->addr_src = ssif_info->addr_source;
1059 data->dev = &ssif_info->client->dev;
1060 data->addr_info = ssif_info->addr_info;
1061 get_device(data->dev);
1062
1063 return 0;
1064 }
1065
1066 /*
1067 * Instead of having our own timer to periodically check the message
1068 * flags, we let the message handler drive us.
1069 */
1070 static void request_events(void *send_info)
1071 {
1072 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1073 unsigned long oflags, *flags;
1074
1075 if (!ssif_info->has_event_buffer)
1076 return;
1077
1078 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1079 /*
1080 * Request flags first, not events, because the lower layer
1081 * doesn't have a way to send an attention. But make sure
1082 * event checking still happens.
1083 */
1084 ssif_info->req_events = true;
1085 if (SSIF_IDLE(ssif_info))
1086 start_flag_fetch(ssif_info, flags);
1087 else {
1088 ssif_info->req_flags = true;
1089 ipmi_ssif_unlock_cond(ssif_info, flags);
1090 }
1091 }
1092
1093 static int ssif_start_processing(void *send_info,
1094 struct ipmi_smi *intf)
1095 {
1096 struct ssif_info *ssif_info = send_info;
1097
1098 ssif_info->intf = intf;
1099
1100 return 0;
1101 }
1102
1103 #define MAX_SSIF_BMCS 4
1104
1105 static unsigned short addr[MAX_SSIF_BMCS];
1106 static int num_addrs;
1107 module_param_array(addr, ushort, &num_addrs, 0);
1108 MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs.");
1109
1110 static char *adapter_name[MAX_SSIF_BMCS];
1111 static int num_adapter_names;
1112 module_param_array(adapter_name, charp, &num_adapter_names, 0);
1113 MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned.");
1114
1115 static int slave_addrs[MAX_SSIF_BMCS];
1116 static int num_slave_addrs;
1117 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1118 MODULE_PARM_DESC(slave_addrs,
1119 "The default IPMB slave address for the controller.");
1120
1121 static bool alerts_broken;
1122 module_param(alerts_broken, bool, 0);
1123 MODULE_PARM_DESC(alerts_broken, "Don't enable alerts for the controller.");
1124
1125 /*
1126 * Bit 0 enables message debugging, bit 1 enables state debugging, and
1127 * bit 2 enables timing debugging. This is an array indexed by
1128 * interface number"
1129 */
1130 static int dbg[MAX_SSIF_BMCS];
1131 static int num_dbg;
1132 module_param_array(dbg, int, &num_dbg, 0);
1133 MODULE_PARM_DESC(dbg, "Turn on debugging.");
1134
1135 static bool ssif_dbg_probe;
1136 module_param_named(dbg_probe, ssif_dbg_probe, bool, 0);
1137 MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters.");
1138
1139 static bool ssif_tryacpi = true;
1140 module_param_named(tryacpi, ssif_tryacpi, bool, 0);
1141 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
1142
1143 static bool ssif_trydmi = true;
1144 module_param_named(trydmi, ssif_trydmi, bool, 0);
1145 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
1146
1147 static DEFINE_MUTEX(ssif_infos_mutex);
1148 static LIST_HEAD(ssif_infos);
1149
1150 #define IPMI_SSIF_ATTR(name) \
1151 static ssize_t ipmi_##name##_show(struct device *dev, \
1152 struct device_attribute *attr, \
1153 char *buf) \
1154 { \
1155 struct ssif_info *ssif_info = dev_get_drvdata(dev); \
1156 \
1157 return snprintf(buf, 10, "%u\n", ssif_get_stat(ssif_info, name));\
1158 } \
1159 static DEVICE_ATTR(name, S_IRUGO, ipmi_##name##_show, NULL)
1160
1161 static ssize_t ipmi_type_show(struct device *dev,
1162 struct device_attribute *attr,
1163 char *buf)
1164 {
1165 return snprintf(buf, 10, "ssif\n");
1166 }
1167 static DEVICE_ATTR(type, S_IRUGO, ipmi_type_show, NULL);
1168
1169 IPMI_SSIF_ATTR(sent_messages);
1170 IPMI_SSIF_ATTR(sent_messages_parts);
1171 IPMI_SSIF_ATTR(send_retries);
1172 IPMI_SSIF_ATTR(send_errors);
1173 IPMI_SSIF_ATTR(received_messages);
1174 IPMI_SSIF_ATTR(received_message_parts);
1175 IPMI_SSIF_ATTR(receive_retries);
1176 IPMI_SSIF_ATTR(receive_errors);
1177 IPMI_SSIF_ATTR(flag_fetches);
1178 IPMI_SSIF_ATTR(hosed);
1179 IPMI_SSIF_ATTR(events);
1180 IPMI_SSIF_ATTR(watchdog_pretimeouts);
1181 IPMI_SSIF_ATTR(alerts);
1182
1183 static struct attribute *ipmi_ssif_dev_attrs[] = {
1184 &dev_attr_type.attr,
1185 &dev_attr_sent_messages.attr,
1186 &dev_attr_sent_messages_parts.attr,
1187 &dev_attr_send_retries.attr,
1188 &dev_attr_send_errors.attr,
1189 &dev_attr_received_messages.attr,
1190 &dev_attr_received_message_parts.attr,
1191 &dev_attr_receive_retries.attr,
1192 &dev_attr_receive_errors.attr,
1193 &dev_attr_flag_fetches.attr,
1194 &dev_attr_hosed.attr,
1195 &dev_attr_events.attr,
1196 &dev_attr_watchdog_pretimeouts.attr,
1197 &dev_attr_alerts.attr,
1198 NULL
1199 };
1200
1201 static const struct attribute_group ipmi_ssif_dev_attr_group = {
1202 .attrs = ipmi_ssif_dev_attrs,
1203 };
1204
1205 static void shutdown_ssif(void *send_info)
1206 {
1207 struct ssif_info *ssif_info = send_info;
1208
1209 device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group);
1210 dev_set_drvdata(&ssif_info->client->dev, NULL);
1211
1212 /* make sure the driver is not looking for flags any more. */
1213 while (ssif_info->ssif_state != SSIF_NORMAL)
1214 schedule_timeout(1);
1215
1216 ssif_info->stopping = true;
1217 del_timer_sync(&ssif_info->retry_timer);
1218 if (ssif_info->thread) {
1219 complete(&ssif_info->wake_thread);
1220 kthread_stop(ssif_info->thread);
1221 }
1222 }
1223
1224 static int ssif_remove(struct i2c_client *client)
1225 {
1226 struct ssif_info *ssif_info = i2c_get_clientdata(client);
1227 struct ssif_addr_info *addr_info;
1228
1229 if (!ssif_info)
1230 return 0;
1231
1232 /*
1233 * After this point, we won't deliver anything asychronously
1234 * to the message handler. We can unregister ourself.
1235 */
1236 ipmi_unregister_smi(ssif_info->intf);
1237
1238 list_for_each_entry(addr_info, &ssif_infos, link) {
1239 if (addr_info->client == client) {
1240 addr_info->client = NULL;
1241 break;
1242 }
1243 }
1244
1245 kfree(ssif_info);
1246
1247 return 0;
1248 }
1249
1250 static int read_response(struct i2c_client *client, unsigned char *resp)
1251 {
1252 int ret = -ENODEV, retry_cnt = SSIF_RECV_RETRIES;
1253
1254 while (retry_cnt > 0) {
1255 ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE,
1256 resp);
1257 if (ret > 0)
1258 break;
1259 msleep(SSIF_MSG_MSEC);
1260 retry_cnt--;
1261 if (retry_cnt <= 0)
1262 break;
1263 }
1264
1265 return ret;
1266 }
1267
1268 static int do_cmd(struct i2c_client *client, int len, unsigned char *msg,
1269 int *resp_len, unsigned char *resp)
1270 {
1271 int retry_cnt;
1272 int ret;
1273
1274 retry_cnt = SSIF_SEND_RETRIES;
1275 retry1:
1276 ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg);
1277 if (ret) {
1278 retry_cnt--;
1279 if (retry_cnt > 0)
1280 goto retry1;
1281 return -ENODEV;
1282 }
1283
1284 ret = read_response(client, resp);
1285 if (ret > 0) {
1286 /* Validate that the response is correct. */
1287 if (ret < 3 ||
1288 (resp[0] != (msg[0] | (1 << 2))) ||
1289 (resp[1] != msg[1]))
1290 ret = -EINVAL;
1291 else if (ret > IPMI_MAX_MSG_LENGTH) {
1292 ret = -E2BIG;
1293 } else {
1294 *resp_len = ret;
1295 ret = 0;
1296 }
1297 }
1298
1299 return ret;
1300 }
1301
1302 static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
1303 {
1304 unsigned char *resp;
1305 unsigned char msg[3];
1306 int rv;
1307 int len;
1308
1309 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1310 if (!resp)
1311 return -ENOMEM;
1312
1313 /* Do a Get Device ID command, since it is required. */
1314 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1315 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1316 rv = do_cmd(client, 2, msg, &len, resp);
1317 if (rv)
1318 rv = -ENODEV;
1319 else
1320 strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
1321 kfree(resp);
1322 return rv;
1323 }
1324
1325 static int strcmp_nospace(char *s1, char *s2)
1326 {
1327 while (*s1 && *s2) {
1328 while (isspace(*s1))
1329 s1++;
1330 while (isspace(*s2))
1331 s2++;
1332 if (*s1 > *s2)
1333 return 1;
1334 if (*s1 < *s2)
1335 return -1;
1336 s1++;
1337 s2++;
1338 }
1339 return 0;
1340 }
1341
1342 static struct ssif_addr_info *ssif_info_find(unsigned short addr,
1343 char *adapter_name,
1344 bool match_null_name)
1345 {
1346 struct ssif_addr_info *info, *found = NULL;
1347
1348 restart:
1349 list_for_each_entry(info, &ssif_infos, link) {
1350 if (info->binfo.addr == addr) {
1351 if (info->adapter_name || adapter_name) {
1352 if (!info->adapter_name != !adapter_name) {
1353 /* One is NULL and one is not */
1354 continue;
1355 }
1356 if (adapter_name &&
1357 strcmp_nospace(info->adapter_name,
1358 adapter_name))
1359 /* Names do not match */
1360 continue;
1361 }
1362 found = info;
1363 break;
1364 }
1365 }
1366
1367 if (!found && match_null_name) {
1368 /* Try to get an exact match first, then try with a NULL name */
1369 adapter_name = NULL;
1370 match_null_name = false;
1371 goto restart;
1372 }
1373
1374 return found;
1375 }
1376
1377 static bool check_acpi(struct ssif_info *ssif_info, struct device *dev)
1378 {
1379 #ifdef CONFIG_ACPI
1380 acpi_handle acpi_handle;
1381
1382 acpi_handle = ACPI_HANDLE(dev);
1383 if (acpi_handle) {
1384 ssif_info->addr_source = SI_ACPI;
1385 ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle;
1386 return true;
1387 }
1388 #endif
1389 return false;
1390 }
1391
1392 static int find_slave_address(struct i2c_client *client, int slave_addr)
1393 {
1394 #ifdef CONFIG_IPMI_DMI_DECODE
1395 if (!slave_addr)
1396 slave_addr = ipmi_dmi_get_slave_addr(
1397 SI_TYPE_INVALID,
1398 i2c_adapter_id(client->adapter),
1399 client->addr);
1400 #endif
1401
1402 return slave_addr;
1403 }
1404
1405 static int start_multipart_test(struct i2c_client *client,
1406 unsigned char *msg, bool do_middle)
1407 {
1408 int retry_cnt = SSIF_SEND_RETRIES, ret;
1409
1410 retry_write:
1411 ret = i2c_smbus_write_block_data(client,
1412 SSIF_IPMI_MULTI_PART_REQUEST_START,
1413 32, msg);
1414 if (ret) {
1415 retry_cnt--;
1416 if (retry_cnt > 0)
1417 goto retry_write;
1418 dev_err(&client->dev, "Could not write multi-part start, though the BMC said it could handle it. Just limit sends to one part.\n");
1419 return ret;
1420 }
1421
1422 if (!do_middle)
1423 return 0;
1424
1425 ret = i2c_smbus_write_block_data(client,
1426 SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
1427 32, msg + 32);
1428 if (ret) {
1429 dev_err(&client->dev, "Could not write multi-part middle, though the BMC said it could handle it. Just limit sends to one part.\n");
1430 return ret;
1431 }
1432
1433 return 0;
1434 }
1435
1436 static void test_multipart_messages(struct i2c_client *client,
1437 struct ssif_info *ssif_info,
1438 unsigned char *resp)
1439 {
1440 unsigned char msg[65];
1441 int ret;
1442 bool do_middle;
1443
1444 if (ssif_info->max_xmit_msg_size <= 32)
1445 return;
1446
1447 do_middle = ssif_info->max_xmit_msg_size > 63;
1448
1449 memset(msg, 0, sizeof(msg));
1450 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1451 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1452
1453 /*
1454 * The specification is all messed up dealing with sending
1455 * multi-part messages. Per what the specification says, it
1456 * is impossible to send a message that is a multiple of 32
1457 * bytes, except for 32 itself. It talks about a "start"
1458 * transaction (cmd=6) that must be 32 bytes, "middle"
1459 * transaction (cmd=7) that must be 32 bytes, and an "end"
1460 * transaction. The "end" transaction is shown as cmd=7 in
1461 * the text, but if that's the case there is no way to
1462 * differentiate between a middle and end part except the
1463 * length being less than 32. But there is a table at the far
1464 * end of the section (that I had never noticed until someone
1465 * pointed it out to me) that mentions it as cmd=8.
1466 *
1467 * After some thought, I think the example is wrong and the
1468 * end transaction should be cmd=8. But some systems don't
1469 * implement cmd=8, they use a zero-length end transaction,
1470 * even though that violates the SMBus specification.
1471 *
1472 * So, to work around this, this code tests if cmd=8 works.
1473 * If it does, then we use that. If not, it tests zero-
1474 * byte end transactions. If that works, good. If not,
1475 * we only allow 63-byte transactions max.
1476 */
1477
1478 ret = start_multipart_test(client, msg, do_middle);
1479 if (ret)
1480 goto out_no_multi_part;
1481
1482 ret = i2c_smbus_write_block_data(client,
1483 SSIF_IPMI_MULTI_PART_REQUEST_END,
1484 1, msg + 64);
1485
1486 if (!ret)
1487 ret = read_response(client, resp);
1488
1489 if (ret > 0) {
1490 /* End transactions work, we are good. */
1491 ssif_info->cmd8_works = true;
1492 return;
1493 }
1494
1495 ret = start_multipart_test(client, msg, do_middle);
1496 if (ret) {
1497 dev_err(&client->dev, "Second multipart test failed.\n");
1498 goto out_no_multi_part;
1499 }
1500
1501 ret = i2c_smbus_write_block_data(client,
1502 SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
1503 0, msg + 64);
1504 if (!ret)
1505 ret = read_response(client, resp);
1506 if (ret > 0)
1507 /* Zero-size end parts work, use those. */
1508 return;
1509
1510 /* Limit to 63 bytes and use a short middle command to mark the end. */
1511 if (ssif_info->max_xmit_msg_size > 63)
1512 ssif_info->max_xmit_msg_size = 63;
1513 return;
1514
1515 out_no_multi_part:
1516 ssif_info->max_xmit_msg_size = 32;
1517 return;
1518 }
1519
1520 /*
1521 * Global enables we care about.
1522 */
1523 #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
1524 IPMI_BMC_EVT_MSG_INTR)
1525
1526 static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
1527 {
1528 unsigned char msg[3];
1529 unsigned char *resp;
1530 struct ssif_info *ssif_info;
1531 int rv = 0;
1532 int len;
1533 int i;
1534 u8 slave_addr = 0;
1535 struct ssif_addr_info *addr_info = NULL;
1536
1537 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1538 if (!resp)
1539 return -ENOMEM;
1540
1541 ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
1542 if (!ssif_info) {
1543 kfree(resp);
1544 return -ENOMEM;
1545 }
1546
1547 if (!check_acpi(ssif_info, &client->dev)) {
1548 addr_info = ssif_info_find(client->addr, client->adapter->name,
1549 true);
1550 if (!addr_info) {
1551 /* Must have come in through sysfs. */
1552 ssif_info->addr_source = SI_HOTMOD;
1553 } else {
1554 ssif_info->addr_source = addr_info->addr_src;
1555 ssif_info->ssif_debug = addr_info->debug;
1556 ssif_info->addr_info = addr_info->addr_info;
1557 addr_info->client = client;
1558 slave_addr = addr_info->slave_addr;
1559 }
1560 }
1561
1562 slave_addr = find_slave_address(client, slave_addr);
1563
1564 pr_info("Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
1565 ipmi_addr_src_to_str(ssif_info->addr_source),
1566 client->addr, client->adapter->name, slave_addr);
1567
1568 ssif_info->client = client;
1569 i2c_set_clientdata(client, ssif_info);
1570
1571 /* Now check for system interface capabilities */
1572 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1573 msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
1574 msg[2] = 0; /* SSIF */
1575 rv = do_cmd(client, 3, msg, &len, resp);
1576 if (!rv && (len >= 3) && (resp[2] == 0)) {
1577 if (len < 7) {
1578 if (ssif_dbg_probe)
1579 pr_info("SSIF info too short: %d\n", len);
1580 goto no_support;
1581 }
1582
1583 /* Got a good SSIF response, handle it. */
1584 ssif_info->max_xmit_msg_size = resp[5];
1585 ssif_info->max_recv_msg_size = resp[6];
1586 ssif_info->multi_support = (resp[4] >> 6) & 0x3;
1587 ssif_info->supports_pec = (resp[4] >> 3) & 0x1;
1588
1589 /* Sanitize the data */
1590 switch (ssif_info->multi_support) {
1591 case SSIF_NO_MULTI:
1592 if (ssif_info->max_xmit_msg_size > 32)
1593 ssif_info->max_xmit_msg_size = 32;
1594 if (ssif_info->max_recv_msg_size > 32)
1595 ssif_info->max_recv_msg_size = 32;
1596 break;
1597
1598 case SSIF_MULTI_2_PART:
1599 if (ssif_info->max_xmit_msg_size > 63)
1600 ssif_info->max_xmit_msg_size = 63;
1601 if (ssif_info->max_recv_msg_size > 62)
1602 ssif_info->max_recv_msg_size = 62;
1603 break;
1604
1605 case SSIF_MULTI_n_PART:
1606 /* We take whatever size given, but do some testing. */
1607 break;
1608
1609 default:
1610 /* Data is not sane, just give up. */
1611 goto no_support;
1612 }
1613 } else {
1614 no_support:
1615 /* Assume no multi-part or PEC support */
1616 pr_info("Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
1617 rv, len, resp[2]);
1618
1619 ssif_info->max_xmit_msg_size = 32;
1620 ssif_info->max_recv_msg_size = 32;
1621 ssif_info->multi_support = SSIF_NO_MULTI;
1622 ssif_info->supports_pec = 0;
1623 }
1624
1625 test_multipart_messages(client, ssif_info, resp);
1626
1627 /* Make sure the NMI timeout is cleared. */
1628 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1629 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
1630 msg[2] = WDT_PRE_TIMEOUT_INT;
1631 rv = do_cmd(client, 3, msg, &len, resp);
1632 if (rv || (len < 3) || (resp[2] != 0))
1633 pr_warn("Unable to clear message flags: %d %d %2.2x\n",
1634 rv, len, resp[2]);
1635
1636 /* Attempt to enable the event buffer. */
1637 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1638 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
1639 rv = do_cmd(client, 2, msg, &len, resp);
1640 if (rv || (len < 4) || (resp[2] != 0)) {
1641 pr_warn("Error getting global enables: %d %d %2.2x\n",
1642 rv, len, resp[2]);
1643 rv = 0; /* Not fatal */
1644 goto found;
1645 }
1646
1647 ssif_info->global_enables = resp[3];
1648
1649 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
1650 ssif_info->has_event_buffer = true;
1651 /* buffer is already enabled, nothing to do. */
1652 goto found;
1653 }
1654
1655 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1656 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1657 msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF;
1658 rv = do_cmd(client, 3, msg, &len, resp);
1659 if (rv || (len < 2)) {
1660 pr_warn("Error setting global enables: %d %d %2.2x\n",
1661 rv, len, resp[2]);
1662 rv = 0; /* Not fatal */
1663 goto found;
1664 }
1665
1666 if (resp[2] == 0) {
1667 /* A successful return means the event buffer is supported. */
1668 ssif_info->has_event_buffer = true;
1669 ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF;
1670 }
1671
1672 /* Some systems don't behave well if you enable alerts. */
1673 if (alerts_broken)
1674 goto found;
1675
1676 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1677 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1678 msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR;
1679 rv = do_cmd(client, 3, msg, &len, resp);
1680 if (rv || (len < 2)) {
1681 pr_warn("Error setting global enables: %d %d %2.2x\n",
1682 rv, len, resp[2]);
1683 rv = 0; /* Not fatal */
1684 goto found;
1685 }
1686
1687 if (resp[2] == 0) {
1688 /* A successful return means the alert is supported. */
1689 ssif_info->supports_alert = true;
1690 ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR;
1691 }
1692
1693 found:
1694 if (ssif_dbg_probe) {
1695 pr_info("ssif_probe: i2c_probe found device at i2c address %x\n",
1696 client->addr);
1697 }
1698
1699 spin_lock_init(&ssif_info->lock);
1700 ssif_info->ssif_state = SSIF_NORMAL;
1701 timer_setup(&ssif_info->retry_timer, retry_timeout, 0);
1702
1703 for (i = 0; i < SSIF_NUM_STATS; i++)
1704 atomic_set(&ssif_info->stats[i], 0);
1705
1706 if (ssif_info->supports_pec)
1707 ssif_info->client->flags |= I2C_CLIENT_PEC;
1708
1709 ssif_info->handlers.owner = THIS_MODULE;
1710 ssif_info->handlers.start_processing = ssif_start_processing;
1711 ssif_info->handlers.shutdown = shutdown_ssif;
1712 ssif_info->handlers.get_smi_info = get_smi_info;
1713 ssif_info->handlers.sender = sender;
1714 ssif_info->handlers.request_events = request_events;
1715
1716 {
1717 unsigned int thread_num;
1718
1719 thread_num = ((i2c_adapter_id(ssif_info->client->adapter)
1720 << 8) |
1721 ssif_info->client->addr);
1722 init_completion(&ssif_info->wake_thread);
1723 ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info,
1724 "kssif%4.4x", thread_num);
1725 if (IS_ERR(ssif_info->thread)) {
1726 rv = PTR_ERR(ssif_info->thread);
1727 dev_notice(&ssif_info->client->dev,
1728 "Could not start kernel thread: error %d\n",
1729 rv);
1730 goto out;
1731 }
1732 }
1733
1734 dev_set_drvdata(&ssif_info->client->dev, ssif_info);
1735 rv = device_add_group(&ssif_info->client->dev,
1736 &ipmi_ssif_dev_attr_group);
1737 if (rv) {
1738 dev_err(&ssif_info->client->dev,
1739 "Unable to add device attributes: error %d\n",
1740 rv);
1741 goto out;
1742 }
1743
1744 rv = ipmi_register_smi(&ssif_info->handlers,
1745 ssif_info,
1746 &ssif_info->client->dev,
1747 slave_addr);
1748 if (rv) {
1749 pr_err("Unable to register device: error %d\n", rv);
1750 goto out_remove_attr;
1751 }
1752
1753 out:
1754 if (rv) {
1755 if (addr_info)
1756 addr_info->client = NULL;
1757
1758 dev_err(&client->dev, "Unable to start IPMI SSIF: %d\n", rv);
1759 kfree(ssif_info);
1760 }
1761 kfree(resp);
1762 return rv;
1763
1764 out_remove_attr:
1765 device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group);
1766 dev_set_drvdata(&ssif_info->client->dev, NULL);
1767 goto out;
1768 }
1769
1770 static int ssif_adapter_handler(struct device *adev, void *opaque)
1771 {
1772 struct ssif_addr_info *addr_info = opaque;
1773
1774 if (adev->type != &i2c_adapter_type)
1775 return 0;
1776
1777 addr_info->added_client = i2c_new_device(to_i2c_adapter(adev),
1778 &addr_info->binfo);
1779
1780 if (!addr_info->adapter_name)
1781 return 1; /* Only try the first I2C adapter by default. */
1782 return 0;
1783 }
1784
1785 static int new_ssif_client(int addr, char *adapter_name,
1786 int debug, int slave_addr,
1787 enum ipmi_addr_src addr_src,
1788 struct device *dev)
1789 {
1790 struct ssif_addr_info *addr_info;
1791 int rv = 0;
1792
1793 mutex_lock(&ssif_infos_mutex);
1794 if (ssif_info_find(addr, adapter_name, false)) {
1795 rv = -EEXIST;
1796 goto out_unlock;
1797 }
1798
1799 addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL);
1800 if (!addr_info) {
1801 rv = -ENOMEM;
1802 goto out_unlock;
1803 }
1804
1805 if (adapter_name) {
1806 addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL);
1807 if (!addr_info->adapter_name) {
1808 kfree(addr_info);
1809 rv = -ENOMEM;
1810 goto out_unlock;
1811 }
1812 }
1813
1814 strncpy(addr_info->binfo.type, DEVICE_NAME,
1815 sizeof(addr_info->binfo.type));
1816 addr_info->binfo.addr = addr;
1817 addr_info->binfo.platform_data = addr_info;
1818 addr_info->debug = debug;
1819 addr_info->slave_addr = slave_addr;
1820 addr_info->addr_src = addr_src;
1821 addr_info->dev = dev;
1822
1823 if (dev)
1824 dev_set_drvdata(dev, addr_info);
1825
1826 list_add_tail(&addr_info->link, &ssif_infos);
1827
1828 if (initialized)
1829 i2c_for_each_dev(addr_info, ssif_adapter_handler);
1830 /* Otherwise address list will get it */
1831
1832 out_unlock:
1833 mutex_unlock(&ssif_infos_mutex);
1834 return rv;
1835 }
1836
1837 static void free_ssif_clients(void)
1838 {
1839 struct ssif_addr_info *info, *tmp;
1840
1841 mutex_lock(&ssif_infos_mutex);
1842 list_for_each_entry_safe(info, tmp, &ssif_infos, link) {
1843 list_del(&info->link);
1844 kfree(info->adapter_name);
1845 kfree(info);
1846 }
1847 mutex_unlock(&ssif_infos_mutex);
1848 }
1849
1850 static unsigned short *ssif_address_list(void)
1851 {
1852 struct ssif_addr_info *info;
1853 unsigned int count = 0, i = 0;
1854 unsigned short *address_list;
1855
1856 list_for_each_entry(info, &ssif_infos, link)
1857 count++;
1858
1859 address_list = kcalloc(count + 1, sizeof(*address_list),
1860 GFP_KERNEL);
1861 if (!address_list)
1862 return NULL;
1863
1864 list_for_each_entry(info, &ssif_infos, link) {
1865 unsigned short addr = info->binfo.addr;
1866 int j;
1867
1868 for (j = 0; j < i; j++) {
1869 if (address_list[j] == addr)
1870 /* Found a dup. */
1871 break;
1872 }
1873 if (j == i) /* Didn't find it in the list. */
1874 address_list[i++] = addr;
1875 }
1876 address_list[i] = I2C_CLIENT_END;
1877
1878 return address_list;
1879 }
1880
1881 #ifdef CONFIG_ACPI
1882 static const struct acpi_device_id ssif_acpi_match[] = {
1883 { "IPI0001", 0 },
1884 { },
1885 };
1886 MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
1887 #endif
1888
1889 #ifdef CONFIG_DMI
1890 static int dmi_ipmi_probe(struct platform_device *pdev)
1891 {
1892 u8 slave_addr = 0;
1893 u16 i2c_addr;
1894 int rv;
1895
1896 if (!ssif_trydmi)
1897 return -ENODEV;
1898
1899 rv = device_property_read_u16(&pdev->dev, "i2c-addr", &i2c_addr);
1900 if (rv) {
1901 dev_warn(&pdev->dev, "No i2c-addr property\n");
1902 return -ENODEV;
1903 }
1904
1905 rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr);
1906 if (rv)
1907 dev_warn(&pdev->dev, "device has no slave-addr property");
1908
1909 return new_ssif_client(i2c_addr, NULL, 0,
1910 slave_addr, SI_SMBIOS, &pdev->dev);
1911 }
1912 #else
1913 static int dmi_ipmi_probe(struct platform_device *pdev)
1914 {
1915 return -ENODEV;
1916 }
1917 #endif
1918
1919 static const struct i2c_device_id ssif_id[] = {
1920 { DEVICE_NAME, 0 },
1921 { }
1922 };
1923 MODULE_DEVICE_TABLE(i2c, ssif_id);
1924
1925 static struct i2c_driver ssif_i2c_driver = {
1926 .class = I2C_CLASS_HWMON,
1927 .driver = {
1928 .name = DEVICE_NAME
1929 },
1930 .probe = ssif_probe,
1931 .remove = ssif_remove,
1932 .alert = ssif_alert,
1933 .id_table = ssif_id,
1934 .detect = ssif_detect
1935 };
1936
1937 static int ssif_platform_probe(struct platform_device *dev)
1938 {
1939 return dmi_ipmi_probe(dev);
1940 }
1941
1942 static int ssif_platform_remove(struct platform_device *dev)
1943 {
1944 struct ssif_addr_info *addr_info = dev_get_drvdata(&dev->dev);
1945
1946 if (!addr_info)
1947 return 0;
1948
1949 mutex_lock(&ssif_infos_mutex);
1950 i2c_unregister_device(addr_info->added_client);
1951
1952 list_del(&addr_info->link);
1953 kfree(addr_info);
1954 mutex_unlock(&ssif_infos_mutex);
1955 return 0;
1956 }
1957
1958 static const struct platform_device_id ssif_plat_ids[] = {
1959 { "dmi-ipmi-ssif", 0 },
1960 { }
1961 };
1962
1963 static struct platform_driver ipmi_driver = {
1964 .driver = {
1965 .name = DEVICE_NAME,
1966 },
1967 .probe = ssif_platform_probe,
1968 .remove = ssif_platform_remove,
1969 .id_table = ssif_plat_ids
1970 };
1971
1972 static int init_ipmi_ssif(void)
1973 {
1974 int i;
1975 int rv;
1976
1977 if (initialized)
1978 return 0;
1979
1980 pr_info("IPMI SSIF Interface driver\n");
1981
1982 /* build list for i2c from addr list */
1983 for (i = 0; i < num_addrs; i++) {
1984 rv = new_ssif_client(addr[i], adapter_name[i],
1985 dbg[i], slave_addrs[i],
1986 SI_HARDCODED, NULL);
1987 if (rv)
1988 pr_err("Couldn't add hardcoded device at addr 0x%x\n",
1989 addr[i]);
1990 }
1991
1992 if (ssif_tryacpi)
1993 ssif_i2c_driver.driver.acpi_match_table =
1994 ACPI_PTR(ssif_acpi_match);
1995
1996 if (ssif_trydmi) {
1997 rv = platform_driver_register(&ipmi_driver);
1998 if (rv)
1999 pr_err("Unable to register driver: %d\n", rv);
2000 }
2001
2002 ssif_i2c_driver.address_list = ssif_address_list();
2003
2004 rv = i2c_add_driver(&ssif_i2c_driver);
2005 if (!rv)
2006 initialized = true;
2007
2008 return rv;
2009 }
2010 module_init(init_ipmi_ssif);
2011
2012 static void cleanup_ipmi_ssif(void)
2013 {
2014 if (!initialized)
2015 return;
2016
2017 initialized = false;
2018
2019 i2c_del_driver(&ssif_i2c_driver);
2020
2021 kfree(ssif_i2c_driver.address_list);
2022
2023 platform_driver_unregister(&ipmi_driver);
2024
2025 free_ssif_clients();
2026 }
2027 module_exit(cleanup_ipmi_ssif);
2028
2029 MODULE_ALIAS("platform:dmi-ipmi-ssif");
2030 MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
2031 MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
2032 MODULE_LICENSE("GPL");
Linux with added FPC-III support