projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'wireless-drivers-next-for-davem-2019-02-06' of git://git.kernel.org/pub...
[linux-2.6-block.git] / drivers / char / ipmi / ipmi_ssif.c
CommitLineData
243ac210 1// SPDX-License-Identifier: GPL-2.0+
25930707
CM		 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
25930707
CM		 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
25880f7d
JP		 30#define pr_fmt(fmt) "ipmi_ssif: " fmt
31
25930707
CM		 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>
e3fe1427 52#include <linux/ctype.h>
526290aa 53#include <linux/time64.h>
95e300c0 54#include "ipmi_si_sm.h"
0944d889 55#include "ipmi_dmi.h"
25930707 56
25930707
CM		 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
10042504 64#define SSIF_IPMI_MULTI_PART_REQUEST_END 8
25930707
CM		 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
93enum 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 */
108enum 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
91620521
CM		 169 /* Number of alers received. */
170 SSIF_STAT_alerts,
171
25930707
CM		 172 /* Always add statistics before this value, it must be last. */
173 SSIF_NUM_STATS
174};
175
176struct ssif_addr_info {
25930707
CM		 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;
0944d889
CM		 183 struct device *dev;
184 struct i2c_client *client;
25930707 185
0745dde6
CM		 186 struct i2c_client *added_client;
187
25930707
CM		 188 struct mutex clients_mutex;
189 struct list_head clients;
190
191 struct list_head link;
192};
193
194struct ssif_info;
195
196typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result,
197 unsigned char *data, unsigned int len);
198
199struct ssif_info {
a567b623 200 struct ipmi_smi *intf;
25930707
CM		 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
91620521 222 u8 global_enables;
25930707 223 bool has_event_buffer;
91620521
CM		 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;
25930707
CM		 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
25930707
CM		 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;
10042504 276 bool cmd8_works; /* See test_multipart_messages() for details. */
25930707
CM		 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
295static bool initialized;
296
25930707
CM		 297static void return_hosed_msg(struct ssif_info *ssif_info,
298 struct ipmi_smi_msg *msg);
299static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags);
300static int start_send(struct ssif_info *ssif_info,
301 unsigned char *data,
302 unsigned int len);
303
304static 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
311static 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
317static void deliver_recv_msg(struct ssif_info *ssif_info,
318 struct ipmi_smi_msg *msg)
319{
0fbecb4f 320 if (msg->rsp_size < 0) {
25930707 321 return_hosed_msg(ssif_info, msg);
25880f7d
JP		 322 pr_err("%s: Malformed message: rsp_size = %d\n",
323 __func__, msg->rsp_size);
25930707 324 } else {
0fbecb4f 325 ipmi_smi_msg_received(ssif_info->intf, msg);
25930707
CM		 326 }
327}
328
329static 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 */
349static 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
368static 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
382static 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
396static 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;
cf9806f3 405 ipmi_ssif_unlock_cond(ssif_info, flags);
25930707
CM		 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
420static 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;
cf9806f3 428 ipmi_ssif_unlock_cond(ssif_info, flags);
25930707
CM		 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 */
449static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags)
450{
451 if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
25930707
CM		 452 /* Watchdog pre-timeout */
453 ssif_inc_stat(ssif_info, watchdog_pretimeouts);
454 start_clear_flags(ssif_info, flags);
0fbecb4f 455 ipmi_smi_watchdog_pretimeout(ssif_info->intf);
25930707
CM		 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
468static 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 */
d0acf734
CM		 476 result = wait_for_completion_interruptible(
477 &ssif_info->wake_thread);
25930707
CM		 478 if (ssif_info->stopping)
479 break;
d0acf734
CM		 480 if (result == -ERESTARTSYS)
481 continue;
482 init_completion(&ssif_info->wake_thread);
25930707
CM		 483
484 if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) {
485 result = i2c_smbus_write_block_data(
3d69d43b 486 ssif_info->client, ssif_info->i2c_command,
25930707
CM		 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(
3d69d43b 492 ssif_info->client, ssif_info->i2c_command,
25930707
CM		 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
507static 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
523static void msg_done_handler(struct ssif_info *ssif_info, int result,
524 unsigned char *data, unsigned int len);
525
91620521 526static void start_get(struct ssif_info *ssif_info)
25930707 527{
25930707
CM		 528 int rv;
529
25930707 530 ssif_info->rtc_us_timer = 0;
3d69d43b 531 ssif_info->multi_pos = 0;
25930707
CM		 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
e99e88a9 545static void retry_timeout(struct timer_list *t)
91620521 546{
e99e88a9 547 struct ssif_info *ssif_info = from_timer(ssif_info, t, retry_timer);
91620521
CM		 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
b4f21054
BT		 564static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type,
565 unsigned int data)
91620521
CM		 566{
567 struct ssif_info *ssif_info = i2c_get_clientdata(client);
568 unsigned long oflags, *flags;
569 bool do_get = false;
570
b4f21054
BT		 571 if (type != I2C_PROTOCOL_SMBUS_ALERT)
572 return;
573
91620521
CM		 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
25930707
CM		 589static int start_resend(struct ssif_info *ssif_info);
590
591static 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
91620521
CM		 608 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
609 ssif_info->waiting_alert = true;
610 ssif_info->rtc_us_timer = SSIF_MSG_USEC;
0711e8c1
JG		 611 if (!ssif_info->stopping)
612 mod_timer(&ssif_info->retry_timer,
613 jiffies + SSIF_MSG_JIFFIES);
91620521 614 ipmi_ssif_unlock_cond(ssif_info, flags);
25930707
CM		 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. */
25930707 634 len -= 2;
7d6380cd 635 data += 2;
3d69d43b 636 for (i = 0; i < len; i++)
7d6380cd 637 ssif_info->data[i] = data[i];
25930707
CM		 638 ssif_info->multi_len = len;
639 ssif_info->multi_pos = 1;
640
641 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
642 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
643 ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
644 if (rv < 0) {
645 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
646 pr_info("Error from i2c_non_blocking_op(1)\n");
647
648 result = -EIO;
649 } else
650 return;
651 } else if (ssif_info->multi_pos) {
652 /* Middle of multi-part read. Start the next transaction. */
653 int i;
654 unsigned char blocknum;
655
656 if (len == 0) {
657 result = -EIO;
658 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
25880f7d 659 pr_info("Middle message with no data\n");
25930707
CM		 660
661 goto continue_op;
662 }
663
3d69d43b 664 blocknum = data[0];
7d6380cd
CM		 665 len--;
666 data++;
667
668 if (blocknum != 0xff && len != 31) {
669 /* All blocks but the last must have 31 data bytes. */
670 result = -EIO;
671 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
672 pr_info("Received middle message <31\n");
25930707 673
7d6380cd
CM		 674 goto continue_op;
675 }
676
677 if (ssif_info->multi_len + len > IPMI_MAX_MSG_LENGTH) {
25930707
CM		 678 /* Received message too big, abort the operation. */
679 result = -E2BIG;
680 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
681 pr_info("Received message too big\n");
682
683 goto continue_op;
684 }
685
3d69d43b 686 for (i = 0; i < len; i++)
7d6380cd 687 ssif_info->data[i + ssif_info->multi_len] = data[i];
25930707
CM		 688 ssif_info->multi_len += len;
689 if (blocknum == 0xff) {
690 /* End of read */
691 len = ssif_info->multi_len;
692 data = ssif_info->data;
7d6380cd 693 } else if (blocknum != ssif_info->multi_pos) {
25930707
CM		 694 /*
695 * Out of sequence block, just abort. Block
696 * numbers start at zero for the second block,
697 * but multi_pos starts at one, so the +1.
698 */
699 result = -EIO;
700 } else {
701 ssif_inc_stat(ssif_info, received_message_parts);
702
703 ssif_info->multi_pos++;
704
705 rv = ssif_i2c_send(ssif_info, msg_done_handler,
706 I2C_SMBUS_READ,
707 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
708 ssif_info->recv,
709 I2C_SMBUS_BLOCK_DATA);
710 if (rv < 0) {
711 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
25880f7d 712 pr_info("Error from ssif_i2c_send\n");
25930707
CM		 713
714 result = -EIO;
715 } else
716 return;
717 }
718 }
719
7d6380cd 720 continue_op:
25930707
CM		 721 if (result < 0) {
722 ssif_inc_stat(ssif_info, receive_errors);
723 } else {
724 ssif_inc_stat(ssif_info, received_messages);
725 ssif_inc_stat(ssif_info, received_message_parts);
726 }
727
25930707 728 if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
25880f7d 729 pr_info("DONE 1: state = %d, result=%d\n",
25930707
CM		 730 ssif_info->ssif_state, result);
731
732 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
733 msg = ssif_info->curr_msg;
734 if (msg) {
735 msg->rsp_size = len;
736 if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
737 msg->rsp_size = IPMI_MAX_MSG_LENGTH;
738 memcpy(msg->rsp, data, msg->rsp_size);
739 ssif_info->curr_msg = NULL;
740 }
741
742 switch (ssif_info->ssif_state) {
743 case SSIF_NORMAL:
744 ipmi_ssif_unlock_cond(ssif_info, flags);
745 if (!msg)
746 break;
747
748 if (result < 0)
749 return_hosed_msg(ssif_info, msg);
750 else
751 deliver_recv_msg(ssif_info, msg);
752 break;
753
754 case SSIF_GETTING_FLAGS:
755 /* We got the flags from the SSIF, now handle them. */
756 if ((result < 0) || (len < 4) || (data[2] != 0)) {
757 /*
758 * Error fetching flags, or invalid length,
759 * just give up for now.
760 */
761 ssif_info->ssif_state = SSIF_NORMAL;
762 ipmi_ssif_unlock_cond(ssif_info, flags);
25880f7d
JP		 763 pr_warn("Error getting flags: %d %d, %x\n",
764 result, len, (len >= 3) ? data[2] : 0);
25930707
CM		 765 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
766 || data[1] != IPMI_GET_MSG_FLAGS_CMD) {
4495ec6d
CM		 767 /*
768 * Don't abort here, maybe it was a queued
769 * response to a previous command.
770 */
771 ipmi_ssif_unlock_cond(ssif_info, flags);
25880f7d 772 pr_warn("Invalid response getting flags: %x %x\n",
25930707
CM		 773 data[0], data[1]);
774 } else {
775 ssif_inc_stat(ssif_info, flag_fetches);
776 ssif_info->msg_flags = data[3];
777 handle_flags(ssif_info, flags);
778 }
779 break;
780
781 case SSIF_CLEARING_FLAGS:
782 /* We cleared the flags. */
783 if ((result < 0) || (len < 3) || (data[2] != 0)) {
784 /* Error clearing flags */
25880f7d
JP		 785 pr_warn("Error clearing flags: %d %d, %x\n",
786 result, len, (len >= 3) ? data[2] : 0);
25930707
CM		 787 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
788 || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) {
25880f7d 789 pr_warn("Invalid response clearing flags: %x %x\n",
25930707
CM		 790 data[0], data[1]);
791 }
792 ssif_info->ssif_state = SSIF_NORMAL;
793 ipmi_ssif_unlock_cond(ssif_info, flags);
794 break;
795
796 case SSIF_GETTING_EVENTS:
797 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
798 /* Error getting event, probably done. */
799 msg->done(msg);
800
801 /* Take off the event flag. */
802 ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
803 handle_flags(ssif_info, flags);
804 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
805 || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) {
25880f7d 806 pr_warn("Invalid response getting events: %x %x\n",
25930707
CM		 807 msg->rsp[0], msg->rsp[1]);
808 msg->done(msg);
809 /* Take off the event flag. */
810 ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
811 handle_flags(ssif_info, flags);
812 } else {
813 handle_flags(ssif_info, flags);
814 ssif_inc_stat(ssif_info, events);
815 deliver_recv_msg(ssif_info, msg);
816 }
817 break;
818
819 case SSIF_GETTING_MESSAGES:
820 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
821 /* Error getting event, probably done. */
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 if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
828 || msg->rsp[1] != IPMI_GET_MSG_CMD) {
25880f7d 829 pr_warn("Invalid response clearing flags: %x %x\n",
25930707
CM		 830 msg->rsp[0], msg->rsp[1]);
831 msg->done(msg);
832
833 /* Take off the msg flag. */
834 ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
835 handle_flags(ssif_info, flags);
836 } else {
837 ssif_inc_stat(ssif_info, incoming_messages);
838 handle_flags(ssif_info, flags);
839 deliver_recv_msg(ssif_info, msg);
840 }
841 break;
842 }
843
844 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
845 if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) {
846 if (ssif_info->req_events)
847 start_event_fetch(ssif_info, flags);
848 else if (ssif_info->req_flags)
849 start_flag_fetch(ssif_info, flags);
850 else
851 start_next_msg(ssif_info, flags);
852 } else
853 ipmi_ssif_unlock_cond(ssif_info, flags);
854
855 if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
25880f7d 856 pr_info("DONE 2: state = %d.\n", ssif_info->ssif_state);
25930707
CM		 857}
858
859static void msg_written_handler(struct ssif_info *ssif_info, int result,
860 unsigned char *data, unsigned int len)
861{
862 int rv;
863
864 /* We are single-threaded here, so no need for a lock. */
865 if (result < 0) {
866 ssif_info->retries_left--;
867 if (ssif_info->retries_left > 0) {
868 if (!start_resend(ssif_info)) {
869 ssif_inc_stat(ssif_info, send_retries);
870 return;
871 }
872 /* request failed, just return the error. */
873 ssif_inc_stat(ssif_info, send_errors);
874
875 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
25880f7d 876 pr_info("%s: Out of retries\n", __func__);
25930707
CM		 877 msg_done_handler(ssif_info, -EIO, NULL, 0);
878 return;
879 }
880
881 ssif_inc_stat(ssif_info, send_errors);
882
883 /*
884 * Got an error on transmit, let the done routine
885 * handle it.
886 */
887 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
888 pr_info("Error in msg_written_handler: %d\n", result);
889
890 msg_done_handler(ssif_info, result, NULL, 0);
891 return;
892 }
893
894 if (ssif_info->multi_data) {
3d69d43b
CM		 895 /*
896 * In the middle of a multi-data write. See the comment
897 * in the SSIF_MULTI_n_PART case in the probe function
898 * for details on the intricacies of this.
899 */
10042504 900 int left, to_write;
6de65fcf 901 unsigned char *data_to_send;
10042504 902 unsigned char cmd;
25930707
CM		 903
904 ssif_inc_stat(ssif_info, sent_messages_parts);
905
906 left = ssif_info->multi_len - ssif_info->multi_pos;
10042504
CM		 907 to_write = left;
908 if (to_write > 32)
909 to_write = 32;
25930707 910 /* Length byte. */
10042504 911 ssif_info->multi_data[ssif_info->multi_pos] = to_write;
6de65fcf 912 data_to_send = ssif_info->multi_data + ssif_info->multi_pos;
10042504
CM		 913 ssif_info->multi_pos += to_write;
914 cmd = SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE;
915 if (ssif_info->cmd8_works) {
916 if (left == to_write) {
917 cmd = SSIF_IPMI_MULTI_PART_REQUEST_END;
918 ssif_info->multi_data = NULL;
919 }
920 } else if (to_write < 32) {
25930707 921 ssif_info->multi_data = NULL;
10042504 922 }
25930707
CM		 923
924 rv = ssif_i2c_send(ssif_info, msg_written_handler,
10042504
CM		 925 I2C_SMBUS_WRITE, cmd,
926 data_to_send, I2C_SMBUS_BLOCK_DATA);
25930707
CM		 927 if (rv < 0) {
928 /* request failed, just return the error. */
929 ssif_inc_stat(ssif_info, send_errors);
930
931 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
932 pr_info("Error from i2c_non_blocking_op(3)\n");
933 msg_done_handler(ssif_info, -EIO, NULL, 0);
934 }
935 } else {
21c8f915 936 /* Ready to request the result. */
91620521 937 unsigned long oflags, *flags;
91620521 938
25930707
CM		 939 ssif_inc_stat(ssif_info, sent_messages);
940 ssif_inc_stat(ssif_info, sent_messages_parts);
941
91620521 942 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
21c8f915
CM		 943 if (ssif_info->got_alert) {
944 /* The result is already ready, just start it. */
91620521 945 ssif_info->got_alert = false;
91620521 946 ipmi_ssif_unlock_cond(ssif_info, flags);
21c8f915 947 start_get(ssif_info);
91620521
CM		 948 } else {
949 /* Wait a jiffie then request the next message */
950 ssif_info->waiting_alert = true;
951 ssif_info->retries_left = SSIF_RECV_RETRIES;
952 ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC;
0711e8c1
JG		 953 if (!ssif_info->stopping)
954 mod_timer(&ssif_info->retry_timer,
955 jiffies + SSIF_MSG_PART_JIFFIES);
91620521
CM		 956 ipmi_ssif_unlock_cond(ssif_info, flags);
957 }
25930707
CM		 958 }
959}
960
961static int start_resend(struct ssif_info *ssif_info)
962{
963 int rv;
964 int command;
965
91620521
CM		 966 ssif_info->got_alert = false;
967
25930707
CM		 968 if (ssif_info->data_len > 32) {
969 command = SSIF_IPMI_MULTI_PART_REQUEST_START;
970 ssif_info->multi_data = ssif_info->data;
971 ssif_info->multi_len = ssif_info->data_len;
972 /*
973 * Subtle thing, this is 32, not 33, because we will
974 * overwrite the thing at position 32 (which was just
975 * transmitted) with the new length.
976 */
977 ssif_info->multi_pos = 32;
978 ssif_info->data[0] = 32;
979 } else {
980 ssif_info->multi_data = NULL;
981 command = SSIF_IPMI_REQUEST;
982 ssif_info->data[0] = ssif_info->data_len;
983 }
984
985 rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
986 command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
987 if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG))
988 pr_info("Error from i2c_non_blocking_op(4)\n");
989 return rv;
990}
991
992static int start_send(struct ssif_info *ssif_info,
993 unsigned char *data,
994 unsigned int len)
995{
996 if (len > IPMI_MAX_MSG_LENGTH)
997 return -E2BIG;
998 if (len > ssif_info->max_xmit_msg_size)
999 return -E2BIG;
1000
1001 ssif_info->retries_left = SSIF_SEND_RETRIES;
3d69d43b 1002 memcpy(ssif_info->data + 1, data, len);
25930707
CM		 1003 ssif_info->data_len = len;
1004 return start_resend(ssif_info);
1005}
1006
1007/* Must be called with the message lock held. */
1008static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags)
1009{
1010 struct ipmi_smi_msg *msg;
1011 unsigned long oflags;
1012
1013 restart:
1014 if (!SSIF_IDLE(ssif_info)) {
1015 ipmi_ssif_unlock_cond(ssif_info, flags);
1016 return;
1017 }
1018
1019 if (!ssif_info->waiting_msg) {
1020 ssif_info->curr_msg = NULL;
1021 ipmi_ssif_unlock_cond(ssif_info, flags);
1022 } else {
1023 int rv;
1024
1025 ssif_info->curr_msg = ssif_info->waiting_msg;
1026 ssif_info->waiting_msg = NULL;
1027 ipmi_ssif_unlock_cond(ssif_info, flags);
1028 rv = start_send(ssif_info,
1029 ssif_info->curr_msg->data,
1030 ssif_info->curr_msg->data_size);
1031 if (rv) {
1032 msg = ssif_info->curr_msg;
1033 ssif_info->curr_msg = NULL;
1034 return_hosed_msg(ssif_info, msg);
1035 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1036 goto restart;
1037 }
1038 }
1039}
1040
1041static void sender(void *send_info,
1042 struct ipmi_smi_msg *msg)
1043{
1044 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1045 unsigned long oflags, *flags;
1046
1047 BUG_ON(ssif_info->waiting_msg);
1048 ssif_info->waiting_msg = msg;
1049
1050 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1051 start_next_msg(ssif_info, flags);
1052
1053 if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) {
526290aa 1054 struct timespec64 t;
25930707 1055
526290aa
AKC		 1056 ktime_get_real_ts64(&t);
1057 pr_info("**Enqueue %02x %02x: %lld.%6.6ld\n",
25880f7d
JP		 1058 msg->data[0], msg->data[1],
1059 (long long)t.tv_sec, (long)t.tv_nsec / NSEC_PER_USEC);
25930707
CM		 1060 }
1061}
1062
1063static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1064{
1065 struct ssif_info *ssif_info = send_info;
1066
1067 data->addr_src = ssif_info->addr_source;
1068 data->dev = &ssif_info->client->dev;
1069 data->addr_info = ssif_info->addr_info;
1070 get_device(data->dev);
1071
1072 return 0;
1073}
1074
1075/*
1076 * Instead of having our own timer to periodically check the message
1077 * flags, we let the message handler drive us.
1078 */
1079static void request_events(void *send_info)
1080{
1081 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1082 unsigned long oflags, *flags;
1083
1084 if (!ssif_info->has_event_buffer)
1085 return;
1086
1087 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1088 /*
1089 * Request flags first, not events, because the lower layer
1090 * doesn't have a way to send an attention. But make sure
1091 * event checking still happens.
1092 */
1093 ssif_info->req_events = true;
1094 if (SSIF_IDLE(ssif_info))
1095 start_flag_fetch(ssif_info, flags);
1096 else {
1097 ssif_info->req_flags = true;
1098 ipmi_ssif_unlock_cond(ssif_info, flags);
1099 }
1100}
1101
a567b623
CM		 1102static int ssif_start_processing(void *send_info,
1103 struct ipmi_smi *intf)
25930707
CM		 1104{
1105 struct ssif_info *ssif_info = send_info;
1106
1107 ssif_info->intf = intf;
1108
1109 return 0;
1110}
1111
1112#define MAX_SSIF_BMCS 4
1113
1114static unsigned short addr[MAX_SSIF_BMCS];
1115static int num_addrs;
1116module_param_array(addr, ushort, &num_addrs, 0);
1117MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs.");
1118
1119static char *adapter_name[MAX_SSIF_BMCS];
1120static int num_adapter_names;
1121module_param_array(adapter_name, charp, &num_adapter_names, 0);
1122MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned.");
1123
1124static int slave_addrs[MAX_SSIF_BMCS];
1125static int num_slave_addrs;
1126module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1127MODULE_PARM_DESC(slave_addrs,
1128 "The default IPMB slave address for the controller.");
1129
bf2d0877
CM		 1130static bool alerts_broken;
1131module_param(alerts_broken, bool, 0);
1132MODULE_PARM_DESC(alerts_broken, "Don't enable alerts for the controller.");
1133
25930707
CM		 1134/*
1135 * Bit 0 enables message debugging, bit 1 enables state debugging, and
1136 * bit 2 enables timing debugging. This is an array indexed by
1137 * interface number"
1138 */
1139static int dbg[MAX_SSIF_BMCS];
1140static int num_dbg;
1141module_param_array(dbg, int, &num_dbg, 0);
1142MODULE_PARM_DESC(dbg, "Turn on debugging.");
1143
1144static bool ssif_dbg_probe;
1145module_param_named(dbg_probe, ssif_dbg_probe, bool, 0);
1146MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters.");
1147
fedb25ea 1148static bool ssif_tryacpi = true;
25930707
CM		 1149module_param_named(tryacpi, ssif_tryacpi, bool, 0);
1150MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
1151
fedb25ea 1152static bool ssif_trydmi = true;
25930707
CM		 1153module_param_named(trydmi, ssif_trydmi, bool, 0);
1154MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
1155
1156static DEFINE_MUTEX(ssif_infos_mutex);
1157static LIST_HEAD(ssif_infos);
1158
ac2673d5
CM		 1159#define IPMI_SSIF_ATTR(name) \
1160static ssize_t ipmi_##name##_show(struct device *dev, \
1161 struct device_attribute *attr, \
1162 char *buf) \
1163{ \
1164 struct ssif_info *ssif_info = dev_get_drvdata(dev); \
1165 \
1166 return snprintf(buf, 10, "%u\n", ssif_get_stat(ssif_info, name));\
1167} \
1168static DEVICE_ATTR(name, S_IRUGO, ipmi_##name##_show, NULL)
1169
1170static ssize_t ipmi_type_show(struct device *dev,
1171 struct device_attribute *attr,
1172 char *buf)
1173{
1174 return snprintf(buf, 10, "ssif\n");
1175}
1176static DEVICE_ATTR(type, S_IRUGO, ipmi_type_show, NULL);
1177
1178IPMI_SSIF_ATTR(sent_messages);
1179IPMI_SSIF_ATTR(sent_messages_parts);
1180IPMI_SSIF_ATTR(send_retries);
1181IPMI_SSIF_ATTR(send_errors);
1182IPMI_SSIF_ATTR(received_messages);
1183IPMI_SSIF_ATTR(received_message_parts);
1184IPMI_SSIF_ATTR(receive_retries);
1185IPMI_SSIF_ATTR(receive_errors);
1186IPMI_SSIF_ATTR(flag_fetches);
1187IPMI_SSIF_ATTR(hosed);
1188IPMI_SSIF_ATTR(events);
1189IPMI_SSIF_ATTR(watchdog_pretimeouts);
1190IPMI_SSIF_ATTR(alerts);
1191
1192static struct attribute *ipmi_ssif_dev_attrs[] = {
1193 &dev_attr_type.attr,
1194 &dev_attr_sent_messages.attr,
1195 &dev_attr_sent_messages_parts.attr,
1196 &dev_attr_send_retries.attr,
1197 &dev_attr_send_errors.attr,
1198 &dev_attr_received_messages.attr,
1199 &dev_attr_received_message_parts.attr,
1200 &dev_attr_receive_retries.attr,
1201 &dev_attr_receive_errors.attr,
1202 &dev_attr_flag_fetches.attr,
1203 &dev_attr_hosed.attr,
1204 &dev_attr_events.attr,
1205 &dev_attr_watchdog_pretimeouts.attr,
1206 &dev_attr_alerts.attr,
1207 NULL
1208};
1209
1210static const struct attribute_group ipmi_ssif_dev_attr_group = {
1211 .attrs = ipmi_ssif_dev_attrs,
1212};
1213
a313dec6 1214static void shutdown_ssif(void *send_info)
25930707 1215{
a313dec6 1216 struct ssif_info *ssif_info = send_info;
25930707 1217
ac2673d5
CM		 1218 device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group);
1219 dev_set_drvdata(&ssif_info->client->dev, NULL);
1220
25930707
CM		 1221 /* make sure the driver is not looking for flags any more. */
1222 while (ssif_info->ssif_state != SSIF_NORMAL)
1223 schedule_timeout(1);
1224
1225 ssif_info->stopping = true;
1226 del_timer_sync(&ssif_info->retry_timer);
1227 if (ssif_info->thread) {
1228 complete(&ssif_info->wake_thread);
1229 kthread_stop(ssif_info->thread);
1230 }
a313dec6
CM		 1231}
1232
1233static int ssif_remove(struct i2c_client *client)
1234{
1235 struct ssif_info *ssif_info = i2c_get_clientdata(client);
a313dec6 1236 struct ssif_addr_info *addr_info;
a313dec6
CM		 1237
1238 if (!ssif_info)
1239 return 0;
1240
1241 /*
1242 * After this point, we won't deliver anything asychronously
1243 * to the message handler. We can unregister ourself.
1244 */
2512e40e 1245 ipmi_unregister_smi(ssif_info->intf);
a313dec6 1246
0944d889
CM		 1247 list_for_each_entry(addr_info, &ssif_infos, link) {
1248 if (addr_info->client == client) {
1249 addr_info->client = NULL;
1250 break;
1251 }
1252 }
1253
2512e40e
CM		 1254 kfree(ssif_info);
1255
12112293 1256 return 0;
25930707
CM		 1257}
1258
10042504
CM		 1259static int read_response(struct i2c_client *client, unsigned char *resp)
1260{
1261 int ret = -ENODEV, retry_cnt = SSIF_RECV_RETRIES;
1262
1263 while (retry_cnt > 0) {
1264 ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE,
1265 resp);
1266 if (ret > 0)
1267 break;
1268 msleep(SSIF_MSG_MSEC);
1269 retry_cnt--;
1270 if (retry_cnt <= 0)
1271 break;
1272 }
1273
1274 return ret;
1275}
1276
25930707
CM		 1277static int do_cmd(struct i2c_client *client, int len, unsigned char *msg,
1278 int *resp_len, unsigned char *resp)
1279{
1280 int retry_cnt;
1281 int ret;
1282
1283 retry_cnt = SSIF_SEND_RETRIES;
1284 retry1:
1285 ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg);
1286 if (ret) {
1287 retry_cnt--;
1288 if (retry_cnt > 0)
1289 goto retry1;
1290 return -ENODEV;
1291 }
1292
10042504 1293 ret = read_response(client, resp);
25930707
CM		 1294 if (ret > 0) {
1295 /* Validate that the response is correct. */
1296 if (ret < 3 ||
1297 (resp[0] != (msg[0] | (1 << 2))) ||
1298 (resp[1] != msg[1]))
1299 ret = -EINVAL;
10042504
CM		 1300 else if (ret > IPMI_MAX_MSG_LENGTH) {
1301 ret = -E2BIG;
1302 } else {
25930707
CM		 1303 *resp_len = ret;
1304 ret = 0;
1305 }
1306 }
1307
1308 return ret;
1309}
1310
1311static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
1312{
1313 unsigned char *resp;
1314 unsigned char msg[3];
1315 int rv;
1316 int len;
1317
1318 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1319 if (!resp)
1320 return -ENOMEM;
1321
1322 /* Do a Get Device ID command, since it is required. */
1323 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1324 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1325 rv = do_cmd(client, 2, msg, &len, resp);
1326 if (rv)
1327 rv = -ENODEV;
1328 else
1329 strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
1330 kfree(resp);
1331 return rv;
1332}
1333
b0e9aaa9
CM		 1334static int strcmp_nospace(char *s1, char *s2)
1335{
1336 while (*s1 && *s2) {
1337 while (isspace(*s1))
1338 s1++;
1339 while (isspace(*s2))
1340 s2++;
1341 if (*s1 > *s2)
1342 return 1;
1343 if (*s1 < *s2)
1344 return -1;
1345 s1++;
1346 s2++;
1347 }
1348 return 0;
1349}
1350
25930707
CM		 1351static struct ssif_addr_info *ssif_info_find(unsigned short addr,
1352 char *adapter_name,
1353 bool match_null_name)
1354{
1355 struct ssif_addr_info *info, *found = NULL;
1356
1357restart:
1358 list_for_each_entry(info, &ssif_infos, link) {
1359 if (info->binfo.addr == addr) {
1360 if (info->adapter_name || adapter_name) {
1361 if (!info->adapter_name != !adapter_name) {
1362 /* One is NULL and one is not */
1363 continue;
1364 }
b0e9aaa9
CM		 1365 if (adapter_name &&
1366 strcmp_nospace(info->adapter_name,
1367 adapter_name))
1368 /* Names do not match */
25930707
CM		 1369 continue;
1370 }
1371 found = info;
1372 break;
1373 }
1374 }
1375
1376 if (!found && match_null_name) {
1377 /* Try to get an exact match first, then try with a NULL name */
1378 adapter_name = NULL;
1379 match_null_name = false;
1380 goto restart;
1381 }
1382
1383 return found;
1384}
1385
1386static bool check_acpi(struct ssif_info *ssif_info, struct device *dev)
1387{
1388#ifdef CONFIG_ACPI
1389 acpi_handle acpi_handle;
1390
1391 acpi_handle = ACPI_HANDLE(dev);
1392 if (acpi_handle) {
1393 ssif_info->addr_source = SI_ACPI;
1394 ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle;
1395 return true;
1396 }
1397#endif
1398 return false;
1399}
1400
94671710
CM		 1401static int find_slave_address(struct i2c_client *client, int slave_addr)
1402{
0944d889
CM		 1403#ifdef CONFIG_IPMI_DMI_DECODE
1404 if (!slave_addr)
1405 slave_addr = ipmi_dmi_get_slave_addr(
95e300c0 1406 SI_TYPE_INVALID,
0944d889
CM		 1407 i2c_adapter_id(client->adapter),
1408 client->addr);
1409#endif
94671710
CM		 1410
1411 return slave_addr;
1412}
1413
10042504
CM		 1414static int start_multipart_test(struct i2c_client *client,
1415 unsigned char *msg, bool do_middle)
1416{
1417 int retry_cnt = SSIF_SEND_RETRIES, ret;
1418
1419retry_write:
1420 ret = i2c_smbus_write_block_data(client,
1421 SSIF_IPMI_MULTI_PART_REQUEST_START,
1422 32, msg);
1423 if (ret) {
1424 retry_cnt--;
1425 if (retry_cnt > 0)
1426 goto retry_write;
1427 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");
1428 return ret;
1429 }
1430
1431 if (!do_middle)
1432 return 0;
1433
1434 ret = i2c_smbus_write_block_data(client,
1435 SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
1436 32, msg + 32);
1437 if (ret) {
1438 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");
1439 return ret;
1440 }
1441
1442 return 0;
1443}
1444
1445static void test_multipart_messages(struct i2c_client *client,
1446 struct ssif_info *ssif_info,
1447 unsigned char *resp)
1448{
1449 unsigned char msg[65];
1450 int ret;
1451 bool do_middle;
1452
1453 if (ssif_info->max_xmit_msg_size <= 32)
1454 return;
1455
1456 do_middle = ssif_info->max_xmit_msg_size > 63;
1457
1458 memset(msg, 0, sizeof(msg));
1459 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1460 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1461
1462 /*
1463 * The specification is all messed up dealing with sending
1464 * multi-part messages. Per what the specification says, it
1465 * is impossible to send a message that is a multiple of 32
1466 * bytes, except for 32 itself. It talks about a "start"
1467 * transaction (cmd=6) that must be 32 bytes, "middle"
1468 * transaction (cmd=7) that must be 32 bytes, and an "end"
1469 * transaction. The "end" transaction is shown as cmd=7 in
1470 * the text, but if that's the case there is no way to
1471 * differentiate between a middle and end part except the
1472 * length being less than 32. But there is a table at the far
1473 * end of the section (that I had never noticed until someone
1474 * pointed it out to me) that mentions it as cmd=8.
1475 *
1476 * After some thought, I think the example is wrong and the
1477 * end transaction should be cmd=8. But some systems don't
1478 * implement cmd=8, they use a zero-length end transaction,
1479 * even though that violates the SMBus specification.
1480 *
1481 * So, to work around this, this code tests if cmd=8 works.
1482 * If it does, then we use that. If not, it tests zero-
1483 * byte end transactions. If that works, good. If not,
1484 * we only allow 63-byte transactions max.
1485 */
1486
1487 ret = start_multipart_test(client, msg, do_middle);
1488 if (ret)
1489 goto out_no_multi_part;
1490
1491 ret = i2c_smbus_write_block_data(client,
1492 SSIF_IPMI_MULTI_PART_REQUEST_END,
1493 1, msg + 64);
1494
1495 if (!ret)
1496 ret = read_response(client, resp);
1497
1498 if (ret > 0) {
1499 /* End transactions work, we are good. */
1500 ssif_info->cmd8_works = true;
1501 return;
1502 }
1503
1504 ret = start_multipart_test(client, msg, do_middle);
1505 if (ret) {
1506 dev_err(&client->dev, "Second multipart test failed.\n");
1507 goto out_no_multi_part;
1508 }
1509
1510 ret = i2c_smbus_write_block_data(client,
1511 SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
1512 0, msg + 64);
1513 if (!ret)
1514 ret = read_response(client, resp);
1515 if (ret > 0)
1516 /* Zero-size end parts work, use those. */
1517 return;
1518
1519 /* Limit to 63 bytes and use a short middle command to mark the end. */
1520 if (ssif_info->max_xmit_msg_size > 63)
1521 ssif_info->max_xmit_msg_size = 63;
1522 return;
1523
1524out_no_multi_part:
1525 ssif_info->max_xmit_msg_size = 32;
1526 return;
1527}
1528
91620521
CM		 1529/*
1530 * Global enables we care about.
1531 */
1532#define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
1533 IPMI_BMC_EVT_MSG_INTR)
1534
25930707
CM		 1535static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
1536{
1537 unsigned char msg[3];
1538 unsigned char *resp;
1539 struct ssif_info *ssif_info;
1540 int rv = 0;
1541 int len;
1542 int i;
1543 u8 slave_addr = 0;
1544 struct ssif_addr_info *addr_info = NULL;
1545
25930707
CM		 1546 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1547 if (!resp)
1548 return -ENOMEM;
1549
1550 ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
1551 if (!ssif_info) {
1552 kfree(resp);
1553 return -ENOMEM;
1554 }
1555
1556 if (!check_acpi(ssif_info, &client->dev)) {
1557 addr_info = ssif_info_find(client->addr, client->adapter->name,
1558 true);
1559 if (!addr_info) {
1560 /* Must have come in through sysfs. */
1561 ssif_info->addr_source = SI_HOTMOD;
1562 } else {
1563 ssif_info->addr_source = addr_info->addr_src;
1564 ssif_info->ssif_debug = addr_info->debug;
1565 ssif_info->addr_info = addr_info->addr_info;
0944d889 1566 addr_info->client = client;
25930707
CM		 1567 slave_addr = addr_info->slave_addr;
1568 }
1569 }
1570
94671710
CM		 1571 slave_addr = find_slave_address(client, slave_addr);
1572
25880f7d
JP		 1573 pr_info("Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
1574 ipmi_addr_src_to_str(ssif_info->addr_source),
1575 client->addr, client->adapter->name, slave_addr);
25930707 1576
25930707
CM		 1577 ssif_info->client = client;
1578 i2c_set_clientdata(client, ssif_info);
1579
1580 /* Now check for system interface capabilities */
1581 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1582 msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
1583 msg[2] = 0; /* SSIF */
1584 rv = do_cmd(client, 3, msg, &len, resp);
1585 if (!rv && (len >= 3) && (resp[2] == 0)) {
1586 if (len < 7) {
1587 if (ssif_dbg_probe)
25880f7d 1588 pr_info("SSIF info too short: %d\n", len);
25930707
CM		 1589 goto no_support;
1590 }
1591
1592 /* Got a good SSIF response, handle it. */
1593 ssif_info->max_xmit_msg_size = resp[5];
1594 ssif_info->max_recv_msg_size = resp[6];
1595 ssif_info->multi_support = (resp[4] >> 6) & 0x3;
1596 ssif_info->supports_pec = (resp[4] >> 3) & 0x1;
1597
1598 /* Sanitize the data */
1599 switch (ssif_info->multi_support) {
1600 case SSIF_NO_MULTI:
1601 if (ssif_info->max_xmit_msg_size > 32)
1602 ssif_info->max_xmit_msg_size = 32;
1603 if (ssif_info->max_recv_msg_size > 32)
1604 ssif_info->max_recv_msg_size = 32;
1605 break;
1606
1607 case SSIF_MULTI_2_PART:
3d69d43b
CM		 1608 if (ssif_info->max_xmit_msg_size > 63)
1609 ssif_info->max_xmit_msg_size = 63;
25930707
CM		 1610 if (ssif_info->max_recv_msg_size > 62)
1611 ssif_info->max_recv_msg_size = 62;
1612 break;
1613
1614 case SSIF_MULTI_n_PART:
10042504 1615 /* We take whatever size given, but do some testing. */
25930707
CM		 1616 break;
1617
1618 default:
1619 /* Data is not sane, just give up. */
1620 goto no_support;
1621 }
1622 } else {
1623 no_support:
1624 /* Assume no multi-part or PEC support */
25880f7d
JP		 1625 pr_info("Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
1626 rv, len, resp[2]);
25930707
CM		 1627
1628 ssif_info->max_xmit_msg_size = 32;
1629 ssif_info->max_recv_msg_size = 32;
1630 ssif_info->multi_support = SSIF_NO_MULTI;
1631 ssif_info->supports_pec = 0;
1632 }
1633
10042504
CM		 1634 test_multipart_messages(client, ssif_info, resp);
1635
25930707
CM		 1636 /* Make sure the NMI timeout is cleared. */
1637 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1638 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
1639 msg[2] = WDT_PRE_TIMEOUT_INT;
1640 rv = do_cmd(client, 3, msg, &len, resp);
1641 if (rv || (len < 3) || (resp[2] != 0))
25880f7d 1642 pr_warn("Unable to clear message flags: %d %d %2.2x\n",
25930707
CM		 1643 rv, len, resp[2]);
1644
1645 /* Attempt to enable the event buffer. */
1646 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1647 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
1648 rv = do_cmd(client, 2, msg, &len, resp);
1649 if (rv || (len < 4) || (resp[2] != 0)) {
25880f7d 1650 pr_warn("Error getting global enables: %d %d %2.2x\n",
25930707
CM		 1651 rv, len, resp[2]);
1652 rv = 0; /* Not fatal */
1653 goto found;
1654 }
1655
91620521
CM		 1656 ssif_info->global_enables = resp[3];
1657
25930707
CM		 1658 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
1659 ssif_info->has_event_buffer = true;
1660 /* buffer is already enabled, nothing to do. */
1661 goto found;
1662 }
1663
1664 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1665 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
91620521 1666 msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF;
25930707
CM		 1667 rv = do_cmd(client, 3, msg, &len, resp);
1668 if (rv || (len < 2)) {
25880f7d 1669 pr_warn("Error setting global enables: %d %d %2.2x\n",
25930707
CM		 1670 rv, len, resp[2]);
1671 rv = 0; /* Not fatal */
1672 goto found;
1673 }
1674
91620521 1675 if (resp[2] == 0) {
25930707
CM		 1676 /* A successful return means the event buffer is supported. */
1677 ssif_info->has_event_buffer = true;
91620521
CM		 1678 ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF;
1679 }
1680
bf2d0877
CM		 1681 /* Some systems don't behave well if you enable alerts. */
1682 if (alerts_broken)
1683 goto found;
1684
91620521
CM		 1685 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1686 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1687 msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR;
1688 rv = do_cmd(client, 3, msg, &len, resp);
1689 if (rv || (len < 2)) {
25880f7d 1690 pr_warn("Error setting global enables: %d %d %2.2x\n",
91620521
CM		 1691 rv, len, resp[2]);
1692 rv = 0; /* Not fatal */
1693 goto found;
1694 }
1695
1696 if (resp[2] == 0) {
1697 /* A successful return means the alert is supported. */
1698 ssif_info->supports_alert = true;
1699 ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR;
1700 }
25930707
CM		 1701
1702 found:
25930707
CM		 1703 if (ssif_dbg_probe) {
1704 pr_info("ssif_probe: i2c_probe found device at i2c address %x\n",
1705 client->addr);
1706 }
1707
1708 spin_lock_init(&ssif_info->lock);
1709 ssif_info->ssif_state = SSIF_NORMAL;
e99e88a9 1710 timer_setup(&ssif_info->retry_timer, retry_timeout, 0);
25930707
CM		 1711
1712 for (i = 0; i < SSIF_NUM_STATS; i++)
1713 atomic_set(&ssif_info->stats[i], 0);
1714
1715 if (ssif_info->supports_pec)
1716 ssif_info->client->flags |= I2C_CLIENT_PEC;
1717
1718 ssif_info->handlers.owner = THIS_MODULE;
1719 ssif_info->handlers.start_processing = ssif_start_processing;
a313dec6 1720 ssif_info->handlers.shutdown = shutdown_ssif;
25930707
CM		 1721 ssif_info->handlers.get_smi_info = get_smi_info;
1722 ssif_info->handlers.sender = sender;
1723 ssif_info->handlers.request_events = request_events;
25930707
CM		 1724
1725 {
1726 unsigned int thread_num;
1727
be8647d2
CM		 1728 thread_num = ((i2c_adapter_id(ssif_info->client->adapter)
1729 << 8) |
25930707
CM		 1730 ssif_info->client->addr);
1731 init_completion(&ssif_info->wake_thread);
1732 ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info,
1733 "kssif%4.4x", thread_num);
1734 if (IS_ERR(ssif_info->thread)) {
1735 rv = PTR_ERR(ssif_info->thread);
1736 dev_notice(&ssif_info->client->dev,
1737 "Could not start kernel thread: error %d\n",
1738 rv);
1739 goto out;
1740 }
1741 }
1742
ac2673d5
CM		 1743 dev_set_drvdata(&ssif_info->client->dev, ssif_info);
1744 rv = device_add_group(&ssif_info->client->dev,
1745 &ipmi_ssif_dev_attr_group);
1746 if (rv) {
1747 dev_err(&ssif_info->client->dev,
1748 "Unable to add device attributes: error %d\n",
1749 rv);
1750 goto out;
1751 }
1752
25930707
CM		 1753 rv = ipmi_register_smi(&ssif_info->handlers,
1754 ssif_info,
25930707
CM		 1755 &ssif_info->client->dev,
1756 slave_addr);
1757 if (rv) {
25880f7d 1758 pr_err("Unable to register device: error %d\n", rv);
ac2673d5 1759 goto out_remove_attr;
25930707
CM		 1760 }
1761
25930707 1762 out:
0944d889 1763 if (rv) {
a8627cda
GS		 1764 if (addr_info)
1765 addr_info->client = NULL;
1766
0944d889 1767 dev_err(&client->dev, "Unable to start IPMI SSIF: %d\n", rv);
25930707 1768 kfree(ssif_info);
0944d889 1769 }
25930707
CM		 1770 kfree(resp);
1771 return rv;
1772
ac2673d5
CM		 1773out_remove_attr:
1774 device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group);
1775 dev_set_drvdata(&ssif_info->client->dev, NULL);
25930707
CM		 1776 goto out;
1777}
1778
1779static int ssif_adapter_handler(struct device *adev, void *opaque)
1780{
1781 struct ssif_addr_info *addr_info = opaque;
1782
1783 if (adev->type != &i2c_adapter_type)
1784 return 0;
1785
0745dde6
CM		 1786 addr_info->added_client = i2c_new_device(to_i2c_adapter(adev),
1787 &addr_info->binfo);
25930707
CM		 1788
1789 if (!addr_info->adapter_name)
1790 return 1; /* Only try the first I2C adapter by default. */
1791 return 0;
1792}
1793
1794static int new_ssif_client(int addr, char *adapter_name,
1795 int debug, int slave_addr,
0944d889
CM		 1796 enum ipmi_addr_src addr_src,
1797 struct device *dev)
25930707
CM		 1798{
1799 struct ssif_addr_info *addr_info;
1800 int rv = 0;
1801
1802 mutex_lock(&ssif_infos_mutex);
1803 if (ssif_info_find(addr, adapter_name, false)) {
1804 rv = -EEXIST;
1805 goto out_unlock;
1806 }
1807
1808 addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL);
1809 if (!addr_info) {
1810 rv = -ENOMEM;
1811 goto out_unlock;
1812 }
1813
1814 if (adapter_name) {
1815 addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL);
1816 if (!addr_info->adapter_name) {
1817 kfree(addr_info);
1818 rv = -ENOMEM;
1819 goto out_unlock;
1820 }
1821 }
1822
1823 strncpy(addr_info->binfo.type, DEVICE_NAME,
1824 sizeof(addr_info->binfo.type));
1825 addr_info->binfo.addr = addr;
1826 addr_info->binfo.platform_data = addr_info;
1827 addr_info->debug = debug;
1828 addr_info->slave_addr = slave_addr;
1829 addr_info->addr_src = addr_src;
0944d889
CM		 1830 addr_info->dev = dev;
1831
87ff091c
CM		 1832 if (dev)
1833 dev_set_drvdata(dev, addr_info);
25930707
CM		 1834
1835 list_add_tail(&addr_info->link, &ssif_infos);
1836
1837 if (initialized)
1838 i2c_for_each_dev(addr_info, ssif_adapter_handler);
1839 /* Otherwise address list will get it */
1840
1841out_unlock:
1842 mutex_unlock(&ssif_infos_mutex);
1843 return rv;
1844}
1845
1846static void free_ssif_clients(void)
1847{
1848 struct ssif_addr_info *info, *tmp;
1849
1850 mutex_lock(&ssif_infos_mutex);
1851 list_for_each_entry_safe(info, tmp, &ssif_infos, link) {
1852 list_del(&info->link);
1853 kfree(info->adapter_name);
1854 kfree(info);
1855 }
1856 mutex_unlock(&ssif_infos_mutex);
1857}
1858
1859static unsigned short *ssif_address_list(void)
1860{
1861 struct ssif_addr_info *info;
c75c5075 1862 unsigned int count = 0, i = 0;
25930707
CM		 1863 unsigned short *address_list;
1864
1865 list_for_each_entry(info, &ssif_infos, link)
1866 count++;
1867
6396bb22
KC		 1868 address_list = kcalloc(count + 1, sizeof(*address_list),
1869 GFP_KERNEL);
25930707
CM		 1870 if (!address_list)
1871 return NULL;
1872
25930707
CM		 1873 list_for_each_entry(info, &ssif_infos, link) {
1874 unsigned short addr = info->binfo.addr;
1875 int j;
1876
1877 for (j = 0; j < i; j++) {
1878 if (address_list[j] == addr)
c75c5075
CM		 1879 /* Found a dup. */
1880 break;
25930707 1881 }
c75c5075
CM		 1882 if (j == i) /* Didn't find it in the list. */
1883 address_list[i++] = addr;
25930707
CM		 1884 }
1885 address_list[i] = I2C_CLIENT_END;
1886
1887 return address_list;
1888}
1889
1890#ifdef CONFIG_ACPI
5186cf9c 1891static const struct acpi_device_id ssif_acpi_match[] = {
25930707
CM		 1892 { "IPI0001", 0 },
1893 { },
1894};
1895MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
25930707
CM		 1896#endif
1897
1898#ifdef CONFIG_DMI
0944d889 1899static int dmi_ipmi_probe(struct platform_device *pdev)
25930707 1900{
95e300c0 1901 u8 slave_addr = 0;
0944d889
CM		 1902 u16 i2c_addr;
1903 int rv;
25930707 1904
0944d889
CM		 1905 if (!ssif_trydmi)
1906 return -ENODEV;
25930707 1907
0944d889
CM		 1908 rv = device_property_read_u16(&pdev->dev, "i2c-addr", &i2c_addr);
1909 if (rv) {
25880f7d 1910 dev_warn(&pdev->dev, "No i2c-addr property\n");
0944d889 1911 return -ENODEV;
25930707
CM		 1912 }
1913
0944d889
CM		 1914 rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr);
1915 if (rv)
1916 dev_warn(&pdev->dev, "device has no slave-addr property");
25930707 1917
0944d889
CM		 1918 return new_ssif_client(i2c_addr, NULL, 0,
1919 slave_addr, SI_SMBIOS, &pdev->dev);
25930707
CM		 1920}
1921#else
0944d889
CM		 1922static int dmi_ipmi_probe(struct platform_device *pdev)
1923{
1924 return -ENODEV;
1925}
25930707
CM		 1926#endif
1927
1928static const struct i2c_device_id ssif_id[] = {
1929 { DEVICE_NAME, 0 },
1930 { }
1931};
1932MODULE_DEVICE_TABLE(i2c, ssif_id);
1933
1934static struct i2c_driver ssif_i2c_driver = {
1935 .class = I2C_CLASS_HWMON,
1936 .driver = {
25930707
CM		 1937 .name = DEVICE_NAME
1938 },
1939 .probe = ssif_probe,
1940 .remove = ssif_remove,
91620521 1941 .alert = ssif_alert,
25930707
CM		 1942 .id_table = ssif_id,
1943 .detect = ssif_detect
1944};
1945
0944d889
CM		 1946static int ssif_platform_probe(struct platform_device *dev)
1947{
1948 return dmi_ipmi_probe(dev);
1949}
1950
1951static int ssif_platform_remove(struct platform_device *dev)
1952{
1953 struct ssif_addr_info *addr_info = dev_get_drvdata(&dev->dev);
1954
1955 if (!addr_info)
1956 return 0;
1957
1958 mutex_lock(&ssif_infos_mutex);
0745dde6 1959 i2c_unregister_device(addr_info->added_client);
0944d889
CM		 1960
1961 list_del(&addr_info->link);
1962 kfree(addr_info);
1963 mutex_unlock(&ssif_infos_mutex);
1964 return 0;
1965}
1966
b3096c70
CM		 1967static const struct platform_device_id ssif_plat_ids[] = {
1968 { "dmi-ipmi-ssif", 0 },
1969 { }
1970};
1971
0944d889
CM		 1972static struct platform_driver ipmi_driver = {
1973 .driver = {
1974 .name = DEVICE_NAME,
1975 },
1976 .probe = ssif_platform_probe,
1977 .remove = ssif_platform_remove,
b3096c70 1978 .id_table = ssif_plat_ids
0944d889
CM		 1979};
1980
25930707
CM		 1981static int init_ipmi_ssif(void)
1982{
1983 int i;
1984 int rv;
1985
1986 if (initialized)
1987 return 0;
1988
1989 pr_info("IPMI SSIF Interface driver\n");
1990
1991 /* build list for i2c from addr list */
1992 for (i = 0; i < num_addrs; i++) {
1993 rv = new_ssif_client(addr[i], adapter_name[i],
1994 dbg[i], slave_addrs[i],
0944d889 1995 SI_HARDCODED, NULL);
d467f7a4 1996 if (rv)
25880f7d 1997 pr_err("Couldn't add hardcoded device at addr 0x%x\n",
25930707
CM		 1998 addr[i]);
1999 }
2000
2001 if (ssif_tryacpi)
2002 ssif_i2c_driver.driver.acpi_match_table =
2003 ACPI_PTR(ssif_acpi_match);
0944d889 2004
0944d889
CM		 2005 if (ssif_trydmi) {
2006 rv = platform_driver_register(&ipmi_driver);
2007 if (rv)
25880f7d 2008 pr_err("Unable to register driver: %d\n", rv);
0944d889
CM		 2009 }
2010
25930707
CM		 2011 ssif_i2c_driver.address_list = ssif_address_list();
2012
2013 rv = i2c_add_driver(&ssif_i2c_driver);
2014 if (!rv)
2015 initialized = true;
2016
2017 return rv;
2018}
2019module_init(init_ipmi_ssif);
2020
2021static void cleanup_ipmi_ssif(void)
2022{
2023 if (!initialized)
2024 return;
2025
2026 initialized = false;
2027
2028 i2c_del_driver(&ssif_i2c_driver);
2029
36e398d7
CM		 2030 kfree(ssif_i2c_driver.address_list);
2031
0944d889
CM		 2032 platform_driver_unregister(&ipmi_driver);
2033
25930707
CM		 2034 free_ssif_clients();
2035}
2036module_exit(cleanup_ipmi_ssif);
2037
0944d889 2038MODULE_ALIAS("platform:dmi-ipmi-ssif");
25930707
CM		 2039MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
2040MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
2041MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)