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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 | ||
25880f7d | 25 | #define pr_fmt(fmt) "ipmi_ssif: " fmt |
83af4194 | 26 | #define dev_fmt(fmt) "ipmi_ssif: " fmt |
25880f7d | 27 | |
25930707 CM |
28 | #if defined(MODVERSIONS) |
29 | #include <linux/modversions.h> | |
30 | #endif | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/moduleparam.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/timer.h> | |
37 | #include <linux/delay.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/spinlock.h> | |
40 | #include <linux/slab.h> | |
41 | #include <linux/list.h> | |
42 | #include <linux/i2c.h> | |
43 | #include <linux/ipmi_smi.h> | |
44 | #include <linux/init.h> | |
45 | #include <linux/dmi.h> | |
46 | #include <linux/kthread.h> | |
47 | #include <linux/acpi.h> | |
e3fe1427 | 48 | #include <linux/ctype.h> |
526290aa | 49 | #include <linux/time64.h> |
0944d889 | 50 | #include "ipmi_dmi.h" |
25930707 | 51 | |
25930707 CM |
52 | #define DEVICE_NAME "ipmi_ssif" |
53 | ||
54 | #define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57 | |
55 | ||
56 | #define SSIF_IPMI_REQUEST 2 | |
57 | #define SSIF_IPMI_MULTI_PART_REQUEST_START 6 | |
58 | #define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7 | |
10042504 | 59 | #define SSIF_IPMI_MULTI_PART_REQUEST_END 8 |
25930707 CM |
60 | #define SSIF_IPMI_RESPONSE 3 |
61 | #define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9 | |
62 | ||
63 | /* ssif_debug is a bit-field | |
64 | * SSIF_DEBUG_MSG - commands and their responses | |
65 | * SSIF_DEBUG_STATES - message states | |
66 | * SSIF_DEBUG_TIMING - Measure times between events in the driver | |
67 | */ | |
68 | #define SSIF_DEBUG_TIMING 4 | |
69 | #define SSIF_DEBUG_STATE 2 | |
70 | #define SSIF_DEBUG_MSG 1 | |
71 | #define SSIF_NODEBUG 0 | |
72 | #define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG) | |
73 | ||
74 | /* | |
75 | * Timer values | |
76 | */ | |
00bb7e76 CM |
77 | #define SSIF_MSG_USEC 60000 /* 60ms between message tries (T3). */ |
78 | #define SSIF_REQ_RETRY_USEC 60000 /* 60ms between send retries (T6). */ | |
25930707 CM |
79 | #define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */ |
80 | ||
81 | /* How many times to we retry sending/receiving the message. */ | |
82 | #define SSIF_SEND_RETRIES 5 | |
83 | #define SSIF_RECV_RETRIES 250 | |
84 | ||
85 | #define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000) | |
00bb7e76 | 86 | #define SSIF_REQ_RETRY_MSEC (SSIF_REQ_RETRY_USEC / 1000) |
25930707 | 87 | #define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC) |
00bb7e76 | 88 | #define SSIF_REQ_RETRY_JIFFIES ((SSIF_REQ_RETRY_USEC * 1000) / TICK_NSEC) |
25930707 CM |
89 | #define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC) |
90 | ||
a1466ec5 CM |
91 | /* |
92 | * Timeout for the watch, only used for get flag timer. | |
93 | */ | |
c65ea996 CM |
94 | #define SSIF_WATCH_MSG_TIMEOUT msecs_to_jiffies(10) |
95 | #define SSIF_WATCH_WATCHDOG_TIMEOUT msecs_to_jiffies(250) | |
a1466ec5 | 96 | |
25930707 | 97 | enum ssif_intf_state { |
8230831c | 98 | SSIF_IDLE, |
25930707 CM |
99 | SSIF_GETTING_FLAGS, |
100 | SSIF_GETTING_EVENTS, | |
101 | SSIF_CLEARING_FLAGS, | |
102 | SSIF_GETTING_MESSAGES, | |
103 | /* FIXME - add watchdog stuff. */ | |
104 | }; | |
105 | ||
8230831c CM |
106 | #define IS_SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_IDLE \ |
107 | && (ssif)->curr_msg == NULL) | |
25930707 CM |
108 | |
109 | /* | |
110 | * Indexes into stats[] in ssif_info below. | |
111 | */ | |
112 | enum ssif_stat_indexes { | |
113 | /* Number of total messages sent. */ | |
114 | SSIF_STAT_sent_messages = 0, | |
115 | ||
116 | /* | |
117 | * Number of message parts sent. Messages may be broken into | |
118 | * parts if they are long. | |
119 | */ | |
120 | SSIF_STAT_sent_messages_parts, | |
121 | ||
122 | /* | |
123 | * Number of time a message was retried. | |
124 | */ | |
125 | SSIF_STAT_send_retries, | |
126 | ||
127 | /* | |
128 | * Number of times the send of a message failed. | |
129 | */ | |
130 | SSIF_STAT_send_errors, | |
131 | ||
132 | /* | |
133 | * Number of message responses received. | |
134 | */ | |
135 | SSIF_STAT_received_messages, | |
136 | ||
137 | /* | |
138 | * Number of message fragments received. | |
139 | */ | |
140 | SSIF_STAT_received_message_parts, | |
141 | ||
142 | /* | |
143 | * Number of times the receive of a message was retried. | |
144 | */ | |
145 | SSIF_STAT_receive_retries, | |
146 | ||
147 | /* | |
148 | * Number of errors receiving messages. | |
149 | */ | |
150 | SSIF_STAT_receive_errors, | |
151 | ||
152 | /* | |
153 | * Number of times a flag fetch was requested. | |
154 | */ | |
155 | SSIF_STAT_flag_fetches, | |
156 | ||
157 | /* | |
158 | * Number of times the hardware didn't follow the state machine. | |
159 | */ | |
160 | SSIF_STAT_hosed, | |
161 | ||
162 | /* | |
163 | * Number of received events. | |
164 | */ | |
165 | SSIF_STAT_events, | |
166 | ||
167 | /* Number of asyncronous messages received. */ | |
168 | SSIF_STAT_incoming_messages, | |
169 | ||
170 | /* Number of watchdog pretimeouts. */ | |
171 | SSIF_STAT_watchdog_pretimeouts, | |
172 | ||
91620521 CM |
173 | /* Number of alers received. */ |
174 | SSIF_STAT_alerts, | |
175 | ||
25930707 CM |
176 | /* Always add statistics before this value, it must be last. */ |
177 | SSIF_NUM_STATS | |
178 | }; | |
179 | ||
180 | struct ssif_addr_info { | |
25930707 CM |
181 | struct i2c_board_info binfo; |
182 | char *adapter_name; | |
183 | int debug; | |
184 | int slave_addr; | |
185 | enum ipmi_addr_src addr_src; | |
186 | union ipmi_smi_info_union addr_info; | |
0944d889 CM |
187 | struct device *dev; |
188 | struct i2c_client *client; | |
25930707 CM |
189 | |
190 | struct mutex clients_mutex; | |
191 | struct list_head clients; | |
192 | ||
193 | struct list_head link; | |
194 | }; | |
195 | ||
196 | struct ssif_info; | |
197 | ||
198 | typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result, | |
199 | unsigned char *data, unsigned int len); | |
200 | ||
201 | struct ssif_info { | |
a567b623 | 202 | struct ipmi_smi *intf; |
25930707 CM |
203 | spinlock_t lock; |
204 | struct ipmi_smi_msg *waiting_msg; | |
205 | struct ipmi_smi_msg *curr_msg; | |
206 | enum ssif_intf_state ssif_state; | |
207 | unsigned long ssif_debug; | |
208 | ||
209 | struct ipmi_smi_handlers handlers; | |
210 | ||
211 | enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */ | |
212 | union ipmi_smi_info_union addr_info; | |
213 | ||
214 | /* | |
215 | * Flags from the last GET_MSG_FLAGS command, used when an ATTN | |
216 | * is set to hold the flags until we are done handling everything | |
217 | * from the flags. | |
218 | */ | |
219 | #define RECEIVE_MSG_AVAIL 0x01 | |
220 | #define EVENT_MSG_BUFFER_FULL 0x02 | |
221 | #define WDT_PRE_TIMEOUT_INT 0x08 | |
222 | unsigned char msg_flags; | |
223 | ||
91620521 | 224 | u8 global_enables; |
25930707 | 225 | bool has_event_buffer; |
91620521 CM |
226 | bool supports_alert; |
227 | ||
228 | /* | |
229 | * Used to tell what we should do with alerts. If we are | |
230 | * waiting on a response, read the data immediately. | |
231 | */ | |
232 | bool got_alert; | |
233 | bool waiting_alert; | |
25930707 | 234 | |
00bb7e76 CM |
235 | /* Used to inform the timeout that it should do a resend. */ |
236 | bool do_resend; | |
237 | ||
25930707 CM |
238 | /* |
239 | * If set to true, this will request events the next time the | |
240 | * state machine is idle. | |
241 | */ | |
242 | bool req_events; | |
243 | ||
244 | /* | |
245 | * If set to true, this will request flags the next time the | |
246 | * state machine is idle. | |
247 | */ | |
248 | bool req_flags; | |
249 | ||
25930707 CM |
250 | /* Used for sending/receiving data. +1 for the length. */ |
251 | unsigned char data[IPMI_MAX_MSG_LENGTH + 1]; | |
252 | unsigned int data_len; | |
253 | ||
254 | /* Temp receive buffer, gets copied into data. */ | |
255 | unsigned char recv[I2C_SMBUS_BLOCK_MAX]; | |
256 | ||
257 | struct i2c_client *client; | |
258 | ssif_i2c_done done_handler; | |
259 | ||
260 | /* Thread interface handling */ | |
261 | struct task_struct *thread; | |
262 | struct completion wake_thread; | |
263 | bool stopping; | |
264 | int i2c_read_write; | |
265 | int i2c_command; | |
266 | unsigned char *i2c_data; | |
267 | unsigned int i2c_size; | |
268 | ||
25930707 CM |
269 | struct timer_list retry_timer; |
270 | int retries_left; | |
271 | ||
c65ea996 | 272 | long watch_timeout; /* Timeout for flags check, 0 if off. */ |
a1466ec5 CM |
273 | struct timer_list watch_timer; /* Flag fetch timer. */ |
274 | ||
25930707 CM |
275 | /* Info from SSIF cmd */ |
276 | unsigned char max_xmit_msg_size; | |
277 | unsigned char max_recv_msg_size; | |
10042504 | 278 | bool cmd8_works; /* See test_multipart_messages() for details. */ |
25930707 CM |
279 | unsigned int multi_support; |
280 | int supports_pec; | |
281 | ||
282 | #define SSIF_NO_MULTI 0 | |
283 | #define SSIF_MULTI_2_PART 1 | |
284 | #define SSIF_MULTI_n_PART 2 | |
285 | unsigned char *multi_data; | |
286 | unsigned int multi_len; | |
287 | unsigned int multi_pos; | |
288 | ||
289 | atomic_t stats[SSIF_NUM_STATS]; | |
290 | }; | |
291 | ||
292 | #define ssif_inc_stat(ssif, stat) \ | |
293 | atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat]) | |
294 | #define ssif_get_stat(ssif, stat) \ | |
295 | ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat])) | |
296 | ||
297 | static bool initialized; | |
2cd0e544 | 298 | static bool platform_registered; |
25930707 | 299 | |
25930707 CM |
300 | static void return_hosed_msg(struct ssif_info *ssif_info, |
301 | struct ipmi_smi_msg *msg); | |
302 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags); | |
303 | static int start_send(struct ssif_info *ssif_info, | |
304 | unsigned char *data, | |
305 | unsigned int len); | |
306 | ||
307 | static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info, | |
308 | unsigned long *flags) | |
562bf770 | 309 | __acquires(&ssif_info->lock) |
25930707 CM |
310 | { |
311 | spin_lock_irqsave(&ssif_info->lock, *flags); | |
312 | return flags; | |
313 | } | |
314 | ||
315 | static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info, | |
316 | unsigned long *flags) | |
562bf770 | 317 | __releases(&ssif_info->lock) |
25930707 CM |
318 | { |
319 | spin_unlock_irqrestore(&ssif_info->lock, *flags); | |
320 | } | |
321 | ||
322 | static void deliver_recv_msg(struct ssif_info *ssif_info, | |
323 | struct ipmi_smi_msg *msg) | |
324 | { | |
0fbecb4f | 325 | if (msg->rsp_size < 0) { |
25930707 | 326 | return_hosed_msg(ssif_info, msg); |
83af4194 CM |
327 | dev_err(&ssif_info->client->dev, |
328 | "%s: Malformed message: rsp_size = %d\n", | |
25880f7d | 329 | __func__, msg->rsp_size); |
25930707 | 330 | } else { |
0fbecb4f | 331 | ipmi_smi_msg_received(ssif_info->intf, msg); |
25930707 CM |
332 | } |
333 | } | |
334 | ||
335 | static void return_hosed_msg(struct ssif_info *ssif_info, | |
336 | struct ipmi_smi_msg *msg) | |
337 | { | |
338 | ssif_inc_stat(ssif_info, hosed); | |
339 | ||
340 | /* Make it a response */ | |
341 | msg->rsp[0] = msg->data[0] | 4; | |
342 | msg->rsp[1] = msg->data[1]; | |
343 | msg->rsp[2] = 0xFF; /* Unknown error. */ | |
344 | msg->rsp_size = 3; | |
345 | ||
346 | deliver_recv_msg(ssif_info, msg); | |
347 | } | |
348 | ||
349 | /* | |
350 | * Must be called with the message lock held. This will release the | |
8230831c CM |
351 | * message lock. Note that the caller will check IS_SSIF_IDLE and |
352 | * start a new operation, so there is no need to check for new | |
353 | * messages to start in here. | |
25930707 CM |
354 | */ |
355 | static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
356 | { | |
357 | unsigned char msg[3]; | |
358 | ||
359 | ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; | |
360 | ssif_info->ssif_state = SSIF_CLEARING_FLAGS; | |
361 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
362 | ||
363 | /* Make sure the watchdog pre-timeout flag is not set at startup. */ | |
364 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
365 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
366 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
367 | ||
368 | if (start_send(ssif_info, msg, 3) != 0) { | |
369 | /* Error, just go to normal state. */ | |
8230831c | 370 | ssif_info->ssif_state = SSIF_IDLE; |
25930707 CM |
371 | } |
372 | } | |
373 | ||
374 | static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags) | |
375 | { | |
376 | unsigned char mb[2]; | |
377 | ||
378 | ssif_info->req_flags = false; | |
379 | ssif_info->ssif_state = SSIF_GETTING_FLAGS; | |
380 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
381 | ||
382 | mb[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
383 | mb[1] = IPMI_GET_MSG_FLAGS_CMD; | |
384 | if (start_send(ssif_info, mb, 2) != 0) | |
8230831c | 385 | ssif_info->ssif_state = SSIF_IDLE; |
25930707 CM |
386 | } |
387 | ||
388 | static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags, | |
389 | struct ipmi_smi_msg *msg) | |
390 | { | |
391 | if (start_send(ssif_info, msg->data, msg->data_size) != 0) { | |
392 | unsigned long oflags; | |
393 | ||
394 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
395 | ssif_info->curr_msg = NULL; | |
8230831c | 396 | ssif_info->ssif_state = SSIF_IDLE; |
25930707 CM |
397 | ipmi_ssif_unlock_cond(ssif_info, flags); |
398 | ipmi_free_smi_msg(msg); | |
399 | } | |
400 | } | |
401 | ||
402 | static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags) | |
403 | { | |
404 | struct ipmi_smi_msg *msg; | |
405 | ||
406 | ssif_info->req_events = false; | |
407 | ||
408 | msg = ipmi_alloc_smi_msg(); | |
409 | if (!msg) { | |
8230831c | 410 | ssif_info->ssif_state = SSIF_IDLE; |
cf9806f3 | 411 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
412 | return; |
413 | } | |
414 | ||
415 | ssif_info->curr_msg = msg; | |
416 | ssif_info->ssif_state = SSIF_GETTING_EVENTS; | |
417 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
418 | ||
419 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
420 | msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; | |
421 | msg->data_size = 2; | |
422 | ||
423 | check_start_send(ssif_info, flags, msg); | |
424 | } | |
425 | ||
426 | static void start_recv_msg_fetch(struct ssif_info *ssif_info, | |
427 | unsigned long *flags) | |
428 | { | |
429 | struct ipmi_smi_msg *msg; | |
430 | ||
431 | msg = ipmi_alloc_smi_msg(); | |
432 | if (!msg) { | |
8230831c | 433 | ssif_info->ssif_state = SSIF_IDLE; |
cf9806f3 | 434 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
435 | return; |
436 | } | |
437 | ||
438 | ssif_info->curr_msg = msg; | |
439 | ssif_info->ssif_state = SSIF_GETTING_MESSAGES; | |
440 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
441 | ||
442 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
443 | msg->data[1] = IPMI_GET_MSG_CMD; | |
444 | msg->data_size = 2; | |
445 | ||
446 | check_start_send(ssif_info, flags, msg); | |
447 | } | |
448 | ||
449 | /* | |
450 | * Must be called with the message lock held. This will release the | |
8230831c CM |
451 | * message lock. Note that the caller will check IS_SSIF_IDLE and |
452 | * start a new operation, so there is no need to check for new | |
453 | * messages to start in here. | |
25930707 CM |
454 | */ |
455 | static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
456 | { | |
457 | if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) { | |
25930707 CM |
458 | /* Watchdog pre-timeout */ |
459 | ssif_inc_stat(ssif_info, watchdog_pretimeouts); | |
460 | start_clear_flags(ssif_info, flags); | |
0fbecb4f | 461 | ipmi_smi_watchdog_pretimeout(ssif_info->intf); |
25930707 CM |
462 | } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL) |
463 | /* Messages available. */ | |
464 | start_recv_msg_fetch(ssif_info, flags); | |
465 | else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL) | |
466 | /* Events available. */ | |
467 | start_event_fetch(ssif_info, flags); | |
468 | else { | |
8230831c | 469 | ssif_info->ssif_state = SSIF_IDLE; |
25930707 CM |
470 | ipmi_ssif_unlock_cond(ssif_info, flags); |
471 | } | |
472 | } | |
473 | ||
474 | static int ipmi_ssif_thread(void *data) | |
475 | { | |
476 | struct ssif_info *ssif_info = data; | |
477 | ||
478 | while (!kthread_should_stop()) { | |
479 | int result; | |
480 | ||
481 | /* Wait for something to do */ | |
d0acf734 CM |
482 | result = wait_for_completion_interruptible( |
483 | &ssif_info->wake_thread); | |
25930707 CM |
484 | if (ssif_info->stopping) |
485 | break; | |
d0acf734 CM |
486 | if (result == -ERESTARTSYS) |
487 | continue; | |
488 | init_completion(&ssif_info->wake_thread); | |
25930707 CM |
489 | |
490 | if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) { | |
491 | result = i2c_smbus_write_block_data( | |
3d69d43b | 492 | ssif_info->client, ssif_info->i2c_command, |
25930707 CM |
493 | ssif_info->i2c_data[0], |
494 | ssif_info->i2c_data + 1); | |
495 | ssif_info->done_handler(ssif_info, result, NULL, 0); | |
496 | } else { | |
497 | result = i2c_smbus_read_block_data( | |
3d69d43b | 498 | ssif_info->client, ssif_info->i2c_command, |
25930707 CM |
499 | ssif_info->i2c_data); |
500 | if (result < 0) | |
501 | ssif_info->done_handler(ssif_info, result, | |
502 | NULL, 0); | |
503 | else | |
504 | ssif_info->done_handler(ssif_info, 0, | |
505 | ssif_info->i2c_data, | |
506 | result); | |
507 | } | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
dcd10526 | 513 | static void ssif_i2c_send(struct ssif_info *ssif_info, |
25930707 CM |
514 | ssif_i2c_done handler, |
515 | int read_write, int command, | |
516 | unsigned char *data, unsigned int size) | |
517 | { | |
518 | ssif_info->done_handler = handler; | |
519 | ||
520 | ssif_info->i2c_read_write = read_write; | |
521 | ssif_info->i2c_command = command; | |
522 | ssif_info->i2c_data = data; | |
523 | ssif_info->i2c_size = size; | |
524 | complete(&ssif_info->wake_thread); | |
25930707 CM |
525 | } |
526 | ||
527 | ||
528 | static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
529 | unsigned char *data, unsigned int len); | |
530 | ||
91620521 | 531 | static void start_get(struct ssif_info *ssif_info) |
25930707 | 532 | { |
3d69d43b | 533 | ssif_info->multi_pos = 0; |
25930707 | 534 | |
dcd10526 LZ |
535 | ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, |
536 | SSIF_IPMI_RESPONSE, | |
537 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
25930707 CM |
538 | } |
539 | ||
00bb7e76 CM |
540 | static void start_resend(struct ssif_info *ssif_info); |
541 | ||
e99e88a9 | 542 | static void retry_timeout(struct timer_list *t) |
91620521 | 543 | { |
e99e88a9 | 544 | struct ssif_info *ssif_info = from_timer(ssif_info, t, retry_timer); |
91620521 | 545 | unsigned long oflags, *flags; |
00bb7e76 | 546 | bool waiting, resend; |
91620521 CM |
547 | |
548 | if (ssif_info->stopping) | |
549 | return; | |
550 | ||
551 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
00bb7e76 CM |
552 | resend = ssif_info->do_resend; |
553 | ssif_info->do_resend = false; | |
91620521 CM |
554 | waiting = ssif_info->waiting_alert; |
555 | ssif_info->waiting_alert = false; | |
556 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
557 | ||
558 | if (waiting) | |
559 | start_get(ssif_info); | |
6ce7995a | 560 | if (resend) { |
00bb7e76 | 561 | start_resend(ssif_info); |
6ce7995a CM |
562 | ssif_inc_stat(ssif_info, send_retries); |
563 | } | |
91620521 CM |
564 | } |
565 | ||
a1466ec5 CM |
566 | static void watch_timeout(struct timer_list *t) |
567 | { | |
568 | struct ssif_info *ssif_info = from_timer(ssif_info, t, watch_timer); | |
569 | unsigned long oflags, *flags; | |
570 | ||
571 | if (ssif_info->stopping) | |
572 | return; | |
573 | ||
574 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
c65ea996 | 575 | if (ssif_info->watch_timeout) { |
a1466ec5 | 576 | mod_timer(&ssif_info->watch_timer, |
c65ea996 | 577 | jiffies + ssif_info->watch_timeout); |
8230831c | 578 | if (IS_SSIF_IDLE(ssif_info)) { |
a1466ec5 CM |
579 | start_flag_fetch(ssif_info, flags); /* Releases lock */ |
580 | return; | |
581 | } | |
582 | ssif_info->req_flags = true; | |
583 | } | |
584 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
585 | } | |
91620521 | 586 | |
b4f21054 BT |
587 | static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type, |
588 | unsigned int data) | |
91620521 CM |
589 | { |
590 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
591 | unsigned long oflags, *flags; | |
592 | bool do_get = false; | |
593 | ||
b4f21054 BT |
594 | if (type != I2C_PROTOCOL_SMBUS_ALERT) |
595 | return; | |
596 | ||
91620521 CM |
597 | ssif_inc_stat(ssif_info, alerts); |
598 | ||
599 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
600 | if (ssif_info->waiting_alert) { | |
601 | ssif_info->waiting_alert = false; | |
602 | del_timer(&ssif_info->retry_timer); | |
603 | do_get = true; | |
604 | } else if (ssif_info->curr_msg) { | |
605 | ssif_info->got_alert = true; | |
606 | } | |
607 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
608 | if (do_get) | |
609 | start_get(ssif_info); | |
610 | } | |
611 | ||
25930707 CM |
612 | static void msg_done_handler(struct ssif_info *ssif_info, int result, |
613 | unsigned char *data, unsigned int len) | |
614 | { | |
615 | struct ipmi_smi_msg *msg; | |
616 | unsigned long oflags, *flags; | |
25930707 CM |
617 | |
618 | /* | |
619 | * We are single-threaded here, so no need for a lock until we | |
620 | * start messing with driver states or the queues. | |
621 | */ | |
622 | ||
623 | if (result < 0) { | |
624 | ssif_info->retries_left--; | |
625 | if (ssif_info->retries_left > 0) { | |
626 | ssif_inc_stat(ssif_info, receive_retries); | |
627 | ||
91620521 CM |
628 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
629 | ssif_info->waiting_alert = true; | |
0711e8c1 JG |
630 | if (!ssif_info->stopping) |
631 | mod_timer(&ssif_info->retry_timer, | |
632 | jiffies + SSIF_MSG_JIFFIES); | |
91620521 | 633 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
634 | return; |
635 | } | |
636 | ||
637 | ssif_inc_stat(ssif_info, receive_errors); | |
638 | ||
639 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
640 | dev_dbg(&ssif_info->client->dev, |
641 | "%s: Error %d\n", __func__, result); | |
25930707 CM |
642 | len = 0; |
643 | goto continue_op; | |
644 | } | |
645 | ||
646 | if ((len > 1) && (ssif_info->multi_pos == 0) | |
647 | && (data[0] == 0x00) && (data[1] == 0x01)) { | |
648 | /* Start of multi-part read. Start the next transaction. */ | |
649 | int i; | |
650 | ||
651 | ssif_inc_stat(ssif_info, received_message_parts); | |
652 | ||
653 | /* Remove the multi-part read marker. */ | |
25930707 | 654 | len -= 2; |
7d6380cd | 655 | data += 2; |
3d69d43b | 656 | for (i = 0; i < len; i++) |
7d6380cd | 657 | ssif_info->data[i] = data[i]; |
25930707 CM |
658 | ssif_info->multi_len = len; |
659 | ssif_info->multi_pos = 1; | |
660 | ||
dcd10526 LZ |
661 | ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, |
662 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
663 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
664 | return; | |
25930707 CM |
665 | } else if (ssif_info->multi_pos) { |
666 | /* Middle of multi-part read. Start the next transaction. */ | |
667 | int i; | |
668 | unsigned char blocknum; | |
669 | ||
670 | if (len == 0) { | |
671 | result = -EIO; | |
672 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
673 | dev_dbg(&ssif_info->client->dev, |
674 | "Middle message with no data\n"); | |
25930707 CM |
675 | |
676 | goto continue_op; | |
677 | } | |
678 | ||
3d69d43b | 679 | blocknum = data[0]; |
7d6380cd CM |
680 | len--; |
681 | data++; | |
682 | ||
683 | if (blocknum != 0xff && len != 31) { | |
684 | /* All blocks but the last must have 31 data bytes. */ | |
685 | result = -EIO; | |
686 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
687 | dev_dbg(&ssif_info->client->dev, |
688 | "Received middle message <31\n"); | |
25930707 | 689 | |
7d6380cd CM |
690 | goto continue_op; |
691 | } | |
692 | ||
693 | if (ssif_info->multi_len + len > IPMI_MAX_MSG_LENGTH) { | |
25930707 CM |
694 | /* Received message too big, abort the operation. */ |
695 | result = -E2BIG; | |
696 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
697 | dev_dbg(&ssif_info->client->dev, |
698 | "Received message too big\n"); | |
25930707 CM |
699 | |
700 | goto continue_op; | |
701 | } | |
702 | ||
3d69d43b | 703 | for (i = 0; i < len; i++) |
7d6380cd | 704 | ssif_info->data[i + ssif_info->multi_len] = data[i]; |
25930707 CM |
705 | ssif_info->multi_len += len; |
706 | if (blocknum == 0xff) { | |
707 | /* End of read */ | |
708 | len = ssif_info->multi_len; | |
709 | data = ssif_info->data; | |
55be8658 | 710 | } else if (blocknum + 1 != ssif_info->multi_pos) { |
25930707 CM |
711 | /* |
712 | * Out of sequence block, just abort. Block | |
713 | * numbers start at zero for the second block, | |
714 | * but multi_pos starts at one, so the +1. | |
715 | */ | |
55be8658 KP |
716 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
717 | dev_dbg(&ssif_info->client->dev, | |
718 | "Received message out of sequence, expected %u, got %u\n", | |
719 | ssif_info->multi_pos - 1, blocknum); | |
25930707 CM |
720 | result = -EIO; |
721 | } else { | |
722 | ssif_inc_stat(ssif_info, received_message_parts); | |
723 | ||
724 | ssif_info->multi_pos++; | |
725 | ||
dcd10526 LZ |
726 | ssif_i2c_send(ssif_info, msg_done_handler, |
727 | I2C_SMBUS_READ, | |
728 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
729 | ssif_info->recv, | |
730 | I2C_SMBUS_BLOCK_DATA); | |
731 | return; | |
25930707 CM |
732 | } |
733 | } | |
734 | ||
7d6380cd | 735 | continue_op: |
25930707 CM |
736 | if (result < 0) { |
737 | ssif_inc_stat(ssif_info, receive_errors); | |
738 | } else { | |
739 | ssif_inc_stat(ssif_info, received_messages); | |
740 | ssif_inc_stat(ssif_info, received_message_parts); | |
741 | } | |
742 | ||
25930707 | 743 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) |
83af4194 CM |
744 | dev_dbg(&ssif_info->client->dev, |
745 | "DONE 1: state = %d, result=%d\n", | |
25930707 CM |
746 | ssif_info->ssif_state, result); |
747 | ||
748 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
749 | msg = ssif_info->curr_msg; | |
750 | if (msg) { | |
6b8526d3 CM |
751 | if (data) { |
752 | if (len > IPMI_MAX_MSG_LENGTH) | |
753 | len = IPMI_MAX_MSG_LENGTH; | |
754 | memcpy(msg->rsp, data, len); | |
755 | } else { | |
756 | len = 0; | |
757 | } | |
25930707 | 758 | msg->rsp_size = len; |
25930707 CM |
759 | ssif_info->curr_msg = NULL; |
760 | } | |
761 | ||
762 | switch (ssif_info->ssif_state) { | |
8230831c | 763 | case SSIF_IDLE: |
25930707 CM |
764 | ipmi_ssif_unlock_cond(ssif_info, flags); |
765 | if (!msg) | |
766 | break; | |
767 | ||
768 | if (result < 0) | |
769 | return_hosed_msg(ssif_info, msg); | |
770 | else | |
771 | deliver_recv_msg(ssif_info, msg); | |
772 | break; | |
773 | ||
774 | case SSIF_GETTING_FLAGS: | |
775 | /* We got the flags from the SSIF, now handle them. */ | |
776 | if ((result < 0) || (len < 4) || (data[2] != 0)) { | |
777 | /* | |
778 | * Error fetching flags, or invalid length, | |
779 | * just give up for now. | |
780 | */ | |
8230831c | 781 | ssif_info->ssif_state = SSIF_IDLE; |
25930707 | 782 | ipmi_ssif_unlock_cond(ssif_info, flags); |
83af4194 CM |
783 | dev_warn(&ssif_info->client->dev, |
784 | "Error getting flags: %d %d, %x\n", | |
785 | result, len, (len >= 3) ? data[2] : 0); | |
25930707 CM |
786 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 |
787 | || data[1] != IPMI_GET_MSG_FLAGS_CMD) { | |
4495ec6d | 788 | /* |
6d2555cd | 789 | * Recv error response, give up. |
4495ec6d | 790 | */ |
6d2555cd | 791 | ssif_info->ssif_state = SSIF_IDLE; |
4495ec6d | 792 | ipmi_ssif_unlock_cond(ssif_info, flags); |
83af4194 CM |
793 | dev_warn(&ssif_info->client->dev, |
794 | "Invalid response getting flags: %x %x\n", | |
795 | data[0], data[1]); | |
25930707 CM |
796 | } else { |
797 | ssif_inc_stat(ssif_info, flag_fetches); | |
798 | ssif_info->msg_flags = data[3]; | |
799 | handle_flags(ssif_info, flags); | |
800 | } | |
801 | break; | |
802 | ||
803 | case SSIF_CLEARING_FLAGS: | |
804 | /* We cleared the flags. */ | |
805 | if ((result < 0) || (len < 3) || (data[2] != 0)) { | |
806 | /* Error clearing flags */ | |
83af4194 CM |
807 | dev_warn(&ssif_info->client->dev, |
808 | "Error clearing flags: %d %d, %x\n", | |
809 | result, len, (len >= 3) ? data[2] : 0); | |
25930707 CM |
810 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 |
811 | || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) { | |
83af4194 CM |
812 | dev_warn(&ssif_info->client->dev, |
813 | "Invalid response clearing flags: %x %x\n", | |
814 | data[0], data[1]); | |
25930707 | 815 | } |
8230831c | 816 | ssif_info->ssif_state = SSIF_IDLE; |
25930707 CM |
817 | ipmi_ssif_unlock_cond(ssif_info, flags); |
818 | break; | |
819 | ||
820 | case SSIF_GETTING_EVENTS: | |
7602b957 CM |
821 | if (!msg) { |
822 | /* Should never happen, but just in case. */ | |
823 | dev_warn(&ssif_info->client->dev, | |
824 | "No message set while getting events\n"); | |
825 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
826 | break; | |
827 | } | |
828 | ||
25930707 CM |
829 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { |
830 | /* Error getting event, probably done. */ | |
831 | msg->done(msg); | |
832 | ||
833 | /* Take off the event flag. */ | |
834 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
835 | handle_flags(ssif_info, flags); | |
836 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
837 | || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) { | |
83af4194 CM |
838 | dev_warn(&ssif_info->client->dev, |
839 | "Invalid response getting events: %x %x\n", | |
840 | msg->rsp[0], msg->rsp[1]); | |
25930707 CM |
841 | msg->done(msg); |
842 | /* Take off the event flag. */ | |
843 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
844 | handle_flags(ssif_info, flags); | |
845 | } else { | |
846 | handle_flags(ssif_info, flags); | |
847 | ssif_inc_stat(ssif_info, events); | |
848 | deliver_recv_msg(ssif_info, msg); | |
849 | } | |
850 | break; | |
851 | ||
852 | case SSIF_GETTING_MESSAGES: | |
7602b957 CM |
853 | if (!msg) { |
854 | /* Should never happen, but just in case. */ | |
855 | dev_warn(&ssif_info->client->dev, | |
856 | "No message set while getting messages\n"); | |
857 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
858 | break; | |
859 | } | |
860 | ||
25930707 CM |
861 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { |
862 | /* Error getting event, probably done. */ | |
863 | msg->done(msg); | |
864 | ||
865 | /* Take off the msg flag. */ | |
866 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
867 | handle_flags(ssif_info, flags); | |
868 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
869 | || msg->rsp[1] != IPMI_GET_MSG_CMD) { | |
83af4194 CM |
870 | dev_warn(&ssif_info->client->dev, |
871 | "Invalid response clearing flags: %x %x\n", | |
872 | msg->rsp[0], msg->rsp[1]); | |
25930707 CM |
873 | msg->done(msg); |
874 | ||
875 | /* Take off the msg flag. */ | |
876 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
877 | handle_flags(ssif_info, flags); | |
878 | } else { | |
879 | ssif_inc_stat(ssif_info, incoming_messages); | |
880 | handle_flags(ssif_info, flags); | |
881 | deliver_recv_msg(ssif_info, msg); | |
882 | } | |
883 | break; | |
7602b957 CM |
884 | |
885 | default: | |
886 | /* Should never happen, but just in case. */ | |
887 | dev_warn(&ssif_info->client->dev, | |
888 | "Invalid state in message done handling: %d\n", | |
889 | ssif_info->ssif_state); | |
890 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
25930707 CM |
891 | } |
892 | ||
893 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
8230831c | 894 | if (IS_SSIF_IDLE(ssif_info) && !ssif_info->stopping) { |
25930707 CM |
895 | if (ssif_info->req_events) |
896 | start_event_fetch(ssif_info, flags); | |
897 | else if (ssif_info->req_flags) | |
898 | start_flag_fetch(ssif_info, flags); | |
899 | else | |
900 | start_next_msg(ssif_info, flags); | |
901 | } else | |
902 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
903 | ||
904 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) | |
83af4194 CM |
905 | dev_dbg(&ssif_info->client->dev, |
906 | "DONE 2: state = %d.\n", ssif_info->ssif_state); | |
25930707 CM |
907 | } |
908 | ||
909 | static void msg_written_handler(struct ssif_info *ssif_info, int result, | |
910 | unsigned char *data, unsigned int len) | |
911 | { | |
25930707 CM |
912 | /* We are single-threaded here, so no need for a lock. */ |
913 | if (result < 0) { | |
914 | ssif_info->retries_left--; | |
915 | if (ssif_info->retries_left > 0) { | |
00bb7e76 CM |
916 | /* |
917 | * Wait the retry timeout time per the spec, | |
918 | * then redo the send. | |
919 | */ | |
920 | ssif_info->do_resend = true; | |
921 | mod_timer(&ssif_info->retry_timer, | |
922 | jiffies + SSIF_REQ_RETRY_JIFFIES); | |
25930707 CM |
923 | return; |
924 | } | |
925 | ||
926 | ssif_inc_stat(ssif_info, send_errors); | |
927 | ||
25930707 | 928 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
83af4194 | 929 | dev_dbg(&ssif_info->client->dev, |
95767ed7 | 930 | "%s: Out of retries\n", __func__); |
25930707 | 931 | |
95767ed7 | 932 | msg_done_handler(ssif_info, -EIO, NULL, 0); |
25930707 CM |
933 | return; |
934 | } | |
935 | ||
936 | if (ssif_info->multi_data) { | |
3d69d43b CM |
937 | /* |
938 | * In the middle of a multi-data write. See the comment | |
939 | * in the SSIF_MULTI_n_PART case in the probe function | |
940 | * for details on the intricacies of this. | |
941 | */ | |
10042504 | 942 | int left, to_write; |
6de65fcf | 943 | unsigned char *data_to_send; |
10042504 | 944 | unsigned char cmd; |
25930707 CM |
945 | |
946 | ssif_inc_stat(ssif_info, sent_messages_parts); | |
947 | ||
948 | left = ssif_info->multi_len - ssif_info->multi_pos; | |
10042504 CM |
949 | to_write = left; |
950 | if (to_write > 32) | |
951 | to_write = 32; | |
25930707 | 952 | /* Length byte. */ |
10042504 | 953 | ssif_info->multi_data[ssif_info->multi_pos] = to_write; |
6de65fcf | 954 | data_to_send = ssif_info->multi_data + ssif_info->multi_pos; |
10042504 CM |
955 | ssif_info->multi_pos += to_write; |
956 | cmd = SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE; | |
957 | if (ssif_info->cmd8_works) { | |
958 | if (left == to_write) { | |
959 | cmd = SSIF_IPMI_MULTI_PART_REQUEST_END; | |
960 | ssif_info->multi_data = NULL; | |
961 | } | |
962 | } else if (to_write < 32) { | |
25930707 | 963 | ssif_info->multi_data = NULL; |
10042504 | 964 | } |
25930707 | 965 | |
dcd10526 LZ |
966 | ssif_i2c_send(ssif_info, msg_written_handler, |
967 | I2C_SMBUS_WRITE, cmd, | |
968 | data_to_send, I2C_SMBUS_BLOCK_DATA); | |
25930707 | 969 | } else { |
21c8f915 | 970 | /* Ready to request the result. */ |
91620521 | 971 | unsigned long oflags, *flags; |
91620521 | 972 | |
25930707 CM |
973 | ssif_inc_stat(ssif_info, sent_messages); |
974 | ssif_inc_stat(ssif_info, sent_messages_parts); | |
975 | ||
91620521 | 976 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
21c8f915 CM |
977 | if (ssif_info->got_alert) { |
978 | /* The result is already ready, just start it. */ | |
91620521 | 979 | ssif_info->got_alert = false; |
91620521 | 980 | ipmi_ssif_unlock_cond(ssif_info, flags); |
21c8f915 | 981 | start_get(ssif_info); |
91620521 | 982 | } else { |
bd7c8ff9 | 983 | /* Wait a jiffy then request the next message */ |
91620521 CM |
984 | ssif_info->waiting_alert = true; |
985 | ssif_info->retries_left = SSIF_RECV_RETRIES; | |
0711e8c1 JG |
986 | if (!ssif_info->stopping) |
987 | mod_timer(&ssif_info->retry_timer, | |
988 | jiffies + SSIF_MSG_PART_JIFFIES); | |
91620521 CM |
989 | ipmi_ssif_unlock_cond(ssif_info, flags); |
990 | } | |
25930707 CM |
991 | } |
992 | } | |
993 | ||
95767ed7 | 994 | static void start_resend(struct ssif_info *ssif_info) |
25930707 | 995 | { |
25930707 CM |
996 | int command; |
997 | ||
91620521 CM |
998 | ssif_info->got_alert = false; |
999 | ||
25930707 CM |
1000 | if (ssif_info->data_len > 32) { |
1001 | command = SSIF_IPMI_MULTI_PART_REQUEST_START; | |
1002 | ssif_info->multi_data = ssif_info->data; | |
1003 | ssif_info->multi_len = ssif_info->data_len; | |
1004 | /* | |
1005 | * Subtle thing, this is 32, not 33, because we will | |
1006 | * overwrite the thing at position 32 (which was just | |
1007 | * transmitted) with the new length. | |
1008 | */ | |
1009 | ssif_info->multi_pos = 32; | |
1010 | ssif_info->data[0] = 32; | |
1011 | } else { | |
1012 | ssif_info->multi_data = NULL; | |
1013 | command = SSIF_IPMI_REQUEST; | |
1014 | ssif_info->data[0] = ssif_info->data_len; | |
1015 | } | |
1016 | ||
dcd10526 LZ |
1017 | ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE, |
1018 | command, ssif_info->data, I2C_SMBUS_BLOCK_DATA); | |
25930707 CM |
1019 | } |
1020 | ||
1021 | static int start_send(struct ssif_info *ssif_info, | |
1022 | unsigned char *data, | |
1023 | unsigned int len) | |
1024 | { | |
1025 | if (len > IPMI_MAX_MSG_LENGTH) | |
1026 | return -E2BIG; | |
1027 | if (len > ssif_info->max_xmit_msg_size) | |
1028 | return -E2BIG; | |
1029 | ||
1030 | ssif_info->retries_left = SSIF_SEND_RETRIES; | |
3d69d43b | 1031 | memcpy(ssif_info->data + 1, data, len); |
25930707 | 1032 | ssif_info->data_len = len; |
95767ed7 CM |
1033 | start_resend(ssif_info); |
1034 | return 0; | |
25930707 CM |
1035 | } |
1036 | ||
1037 | /* Must be called with the message lock held. */ | |
1038 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags) | |
1039 | { | |
1040 | struct ipmi_smi_msg *msg; | |
1041 | unsigned long oflags; | |
1042 | ||
1043 | restart: | |
8230831c | 1044 | if (!IS_SSIF_IDLE(ssif_info)) { |
25930707 CM |
1045 | ipmi_ssif_unlock_cond(ssif_info, flags); |
1046 | return; | |
1047 | } | |
1048 | ||
1049 | if (!ssif_info->waiting_msg) { | |
1050 | ssif_info->curr_msg = NULL; | |
1051 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1052 | } else { | |
1053 | int rv; | |
1054 | ||
1055 | ssif_info->curr_msg = ssif_info->waiting_msg; | |
1056 | ssif_info->waiting_msg = NULL; | |
1057 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1058 | rv = start_send(ssif_info, | |
1059 | ssif_info->curr_msg->data, | |
1060 | ssif_info->curr_msg->data_size); | |
1061 | if (rv) { | |
1062 | msg = ssif_info->curr_msg; | |
1063 | ssif_info->curr_msg = NULL; | |
1064 | return_hosed_msg(ssif_info, msg); | |
1065 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1066 | goto restart; | |
1067 | } | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | static void sender(void *send_info, | |
1072 | struct ipmi_smi_msg *msg) | |
1073 | { | |
5396ccbd | 1074 | struct ssif_info *ssif_info = send_info; |
25930707 CM |
1075 | unsigned long oflags, *flags; |
1076 | ||
1077 | BUG_ON(ssif_info->waiting_msg); | |
1078 | ssif_info->waiting_msg = msg; | |
1079 | ||
1080 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1081 | start_next_msg(ssif_info, flags); | |
1082 | ||
1083 | if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) { | |
526290aa | 1084 | struct timespec64 t; |
25930707 | 1085 | |
526290aa | 1086 | ktime_get_real_ts64(&t); |
83af4194 CM |
1087 | dev_dbg(&ssif_info->client->dev, |
1088 | "**Enqueue %02x %02x: %lld.%6.6ld\n", | |
25880f7d JP |
1089 | msg->data[0], msg->data[1], |
1090 | (long long)t.tv_sec, (long)t.tv_nsec / NSEC_PER_USEC); | |
25930707 CM |
1091 | } |
1092 | } | |
1093 | ||
1094 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) | |
1095 | { | |
1096 | struct ssif_info *ssif_info = send_info; | |
1097 | ||
1098 | data->addr_src = ssif_info->addr_source; | |
1099 | data->dev = &ssif_info->client->dev; | |
1100 | data->addr_info = ssif_info->addr_info; | |
1101 | get_device(data->dev); | |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | /* | |
a1466ec5 | 1107 | * Upper layer wants us to request events. |
25930707 CM |
1108 | */ |
1109 | static void request_events(void *send_info) | |
1110 | { | |
5396ccbd | 1111 | struct ssif_info *ssif_info = send_info; |
25930707 CM |
1112 | unsigned long oflags, *flags; |
1113 | ||
1114 | if (!ssif_info->has_event_buffer) | |
1115 | return; | |
1116 | ||
1117 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
25930707 | 1118 | ssif_info->req_events = true; |
a1466ec5 CM |
1119 | ipmi_ssif_unlock_cond(ssif_info, flags); |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * Upper layer is changing the flag saying whether we need to request | |
1124 | * flags periodically or not. | |
1125 | */ | |
c65ea996 | 1126 | static void ssif_set_need_watch(void *send_info, unsigned int watch_mask) |
a1466ec5 | 1127 | { |
5396ccbd | 1128 | struct ssif_info *ssif_info = send_info; |
a1466ec5 | 1129 | unsigned long oflags, *flags; |
c65ea996 CM |
1130 | long timeout = 0; |
1131 | ||
1132 | if (watch_mask & IPMI_WATCH_MASK_CHECK_MESSAGES) | |
1133 | timeout = SSIF_WATCH_MSG_TIMEOUT; | |
e1891cff | 1134 | else if (watch_mask) |
c65ea996 | 1135 | timeout = SSIF_WATCH_WATCHDOG_TIMEOUT; |
a1466ec5 CM |
1136 | |
1137 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
c65ea996 CM |
1138 | if (timeout != ssif_info->watch_timeout) { |
1139 | ssif_info->watch_timeout = timeout; | |
1140 | if (ssif_info->watch_timeout) | |
a1466ec5 | 1141 | mod_timer(&ssif_info->watch_timer, |
c65ea996 | 1142 | jiffies + ssif_info->watch_timeout); |
25930707 | 1143 | } |
a1466ec5 | 1144 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
1145 | } |
1146 | ||
a567b623 CM |
1147 | static int ssif_start_processing(void *send_info, |
1148 | struct ipmi_smi *intf) | |
25930707 CM |
1149 | { |
1150 | struct ssif_info *ssif_info = send_info; | |
1151 | ||
1152 | ssif_info->intf = intf; | |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
1157 | #define MAX_SSIF_BMCS 4 | |
1158 | ||
1159 | static unsigned short addr[MAX_SSIF_BMCS]; | |
1160 | static int num_addrs; | |
1161 | module_param_array(addr, ushort, &num_addrs, 0); | |
1162 | MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs."); | |
1163 | ||
1164 | static char *adapter_name[MAX_SSIF_BMCS]; | |
1165 | static int num_adapter_names; | |
1166 | module_param_array(adapter_name, charp, &num_adapter_names, 0); | |
1167 | MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned."); | |
1168 | ||
1169 | static int slave_addrs[MAX_SSIF_BMCS]; | |
1170 | static int num_slave_addrs; | |
1171 | module_param_array(slave_addrs, int, &num_slave_addrs, 0); | |
1172 | MODULE_PARM_DESC(slave_addrs, | |
1173 | "The default IPMB slave address for the controller."); | |
1174 | ||
bf2d0877 CM |
1175 | static bool alerts_broken; |
1176 | module_param(alerts_broken, bool, 0); | |
1177 | MODULE_PARM_DESC(alerts_broken, "Don't enable alerts for the controller."); | |
1178 | ||
25930707 CM |
1179 | /* |
1180 | * Bit 0 enables message debugging, bit 1 enables state debugging, and | |
1181 | * bit 2 enables timing debugging. This is an array indexed by | |
1182 | * interface number" | |
1183 | */ | |
1184 | static int dbg[MAX_SSIF_BMCS]; | |
1185 | static int num_dbg; | |
1186 | module_param_array(dbg, int, &num_dbg, 0); | |
1187 | MODULE_PARM_DESC(dbg, "Turn on debugging."); | |
1188 | ||
1189 | static bool ssif_dbg_probe; | |
1190 | module_param_named(dbg_probe, ssif_dbg_probe, bool, 0); | |
1191 | MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters."); | |
1192 | ||
fedb25ea | 1193 | static bool ssif_tryacpi = true; |
25930707 CM |
1194 | module_param_named(tryacpi, ssif_tryacpi, bool, 0); |
1195 | MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI"); | |
1196 | ||
fedb25ea | 1197 | static bool ssif_trydmi = true; |
25930707 CM |
1198 | module_param_named(trydmi, ssif_trydmi, bool, 0); |
1199 | MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)"); | |
1200 | ||
1201 | static DEFINE_MUTEX(ssif_infos_mutex); | |
1202 | static LIST_HEAD(ssif_infos); | |
1203 | ||
ac2673d5 CM |
1204 | #define IPMI_SSIF_ATTR(name) \ |
1205 | static ssize_t ipmi_##name##_show(struct device *dev, \ | |
1206 | struct device_attribute *attr, \ | |
1207 | char *buf) \ | |
1208 | { \ | |
1209 | struct ssif_info *ssif_info = dev_get_drvdata(dev); \ | |
1210 | \ | |
fc4e7848 | 1211 | return sysfs_emit(buf, "%u\n", ssif_get_stat(ssif_info, name));\ |
ac2673d5 CM |
1212 | } \ |
1213 | static DEVICE_ATTR(name, S_IRUGO, ipmi_##name##_show, NULL) | |
1214 | ||
1215 | static ssize_t ipmi_type_show(struct device *dev, | |
1216 | struct device_attribute *attr, | |
1217 | char *buf) | |
1218 | { | |
fc4e7848 | 1219 | return sysfs_emit(buf, "ssif\n"); |
ac2673d5 CM |
1220 | } |
1221 | static DEVICE_ATTR(type, S_IRUGO, ipmi_type_show, NULL); | |
1222 | ||
1223 | IPMI_SSIF_ATTR(sent_messages); | |
1224 | IPMI_SSIF_ATTR(sent_messages_parts); | |
1225 | IPMI_SSIF_ATTR(send_retries); | |
1226 | IPMI_SSIF_ATTR(send_errors); | |
1227 | IPMI_SSIF_ATTR(received_messages); | |
1228 | IPMI_SSIF_ATTR(received_message_parts); | |
1229 | IPMI_SSIF_ATTR(receive_retries); | |
1230 | IPMI_SSIF_ATTR(receive_errors); | |
1231 | IPMI_SSIF_ATTR(flag_fetches); | |
1232 | IPMI_SSIF_ATTR(hosed); | |
1233 | IPMI_SSIF_ATTR(events); | |
1234 | IPMI_SSIF_ATTR(watchdog_pretimeouts); | |
1235 | IPMI_SSIF_ATTR(alerts); | |
1236 | ||
1237 | static struct attribute *ipmi_ssif_dev_attrs[] = { | |
1238 | &dev_attr_type.attr, | |
1239 | &dev_attr_sent_messages.attr, | |
1240 | &dev_attr_sent_messages_parts.attr, | |
1241 | &dev_attr_send_retries.attr, | |
1242 | &dev_attr_send_errors.attr, | |
1243 | &dev_attr_received_messages.attr, | |
1244 | &dev_attr_received_message_parts.attr, | |
1245 | &dev_attr_receive_retries.attr, | |
1246 | &dev_attr_receive_errors.attr, | |
1247 | &dev_attr_flag_fetches.attr, | |
1248 | &dev_attr_hosed.attr, | |
1249 | &dev_attr_events.attr, | |
1250 | &dev_attr_watchdog_pretimeouts.attr, | |
1251 | &dev_attr_alerts.attr, | |
1252 | NULL | |
1253 | }; | |
1254 | ||
1255 | static const struct attribute_group ipmi_ssif_dev_attr_group = { | |
1256 | .attrs = ipmi_ssif_dev_attrs, | |
1257 | }; | |
1258 | ||
a313dec6 | 1259 | static void shutdown_ssif(void *send_info) |
25930707 | 1260 | { |
a313dec6 | 1261 | struct ssif_info *ssif_info = send_info; |
25930707 | 1262 | |
ac2673d5 CM |
1263 | device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group); |
1264 | dev_set_drvdata(&ssif_info->client->dev, NULL); | |
1265 | ||
25930707 | 1266 | /* make sure the driver is not looking for flags any more. */ |
8230831c | 1267 | while (ssif_info->ssif_state != SSIF_IDLE) |
25930707 CM |
1268 | schedule_timeout(1); |
1269 | ||
1270 | ssif_info->stopping = true; | |
a1466ec5 | 1271 | del_timer_sync(&ssif_info->watch_timer); |
25930707 CM |
1272 | del_timer_sync(&ssif_info->retry_timer); |
1273 | if (ssif_info->thread) { | |
1274 | complete(&ssif_info->wake_thread); | |
1275 | kthread_stop(ssif_info->thread); | |
1276 | } | |
a313dec6 CM |
1277 | } |
1278 | ||
ed5c2f5f | 1279 | static void ssif_remove(struct i2c_client *client) |
a313dec6 CM |
1280 | { |
1281 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
a313dec6 | 1282 | struct ssif_addr_info *addr_info; |
a313dec6 | 1283 | |
a313dec6 | 1284 | /* |
957c822a | 1285 | * After this point, we won't deliver anything asynchronously |
a313dec6 CM |
1286 | * to the message handler. We can unregister ourself. |
1287 | */ | |
2512e40e | 1288 | ipmi_unregister_smi(ssif_info->intf); |
a313dec6 | 1289 | |
0944d889 CM |
1290 | list_for_each_entry(addr_info, &ssif_infos, link) { |
1291 | if (addr_info->client == client) { | |
1292 | addr_info->client = NULL; | |
1293 | break; | |
1294 | } | |
1295 | } | |
1296 | ||
2512e40e | 1297 | kfree(ssif_info); |
25930707 CM |
1298 | } |
1299 | ||
10042504 CM |
1300 | static int read_response(struct i2c_client *client, unsigned char *resp) |
1301 | { | |
1302 | int ret = -ENODEV, retry_cnt = SSIF_RECV_RETRIES; | |
1303 | ||
1304 | while (retry_cnt > 0) { | |
1305 | ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE, | |
1306 | resp); | |
1307 | if (ret > 0) | |
1308 | break; | |
1309 | msleep(SSIF_MSG_MSEC); | |
1310 | retry_cnt--; | |
1311 | if (retry_cnt <= 0) | |
1312 | break; | |
1313 | } | |
1314 | ||
1315 | return ret; | |
1316 | } | |
1317 | ||
25930707 CM |
1318 | static int do_cmd(struct i2c_client *client, int len, unsigned char *msg, |
1319 | int *resp_len, unsigned char *resp) | |
1320 | { | |
1321 | int retry_cnt; | |
1322 | int ret; | |
1323 | ||
1324 | retry_cnt = SSIF_SEND_RETRIES; | |
1325 | retry1: | |
1326 | ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg); | |
1327 | if (ret) { | |
1328 | retry_cnt--; | |
00bb7e76 CM |
1329 | if (retry_cnt > 0) { |
1330 | msleep(SSIF_REQ_RETRY_MSEC); | |
25930707 | 1331 | goto retry1; |
00bb7e76 | 1332 | } |
25930707 CM |
1333 | return -ENODEV; |
1334 | } | |
1335 | ||
10042504 | 1336 | ret = read_response(client, resp); |
25930707 CM |
1337 | if (ret > 0) { |
1338 | /* Validate that the response is correct. */ | |
1339 | if (ret < 3 || | |
1340 | (resp[0] != (msg[0] | (1 << 2))) || | |
1341 | (resp[1] != msg[1])) | |
1342 | ret = -EINVAL; | |
10042504 CM |
1343 | else if (ret > IPMI_MAX_MSG_LENGTH) { |
1344 | ret = -E2BIG; | |
1345 | } else { | |
25930707 CM |
1346 | *resp_len = ret; |
1347 | ret = 0; | |
1348 | } | |
1349 | } | |
1350 | ||
1351 | return ret; | |
1352 | } | |
1353 | ||
1354 | static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info) | |
1355 | { | |
1356 | unsigned char *resp; | |
1357 | unsigned char msg[3]; | |
1358 | int rv; | |
1359 | int len; | |
1360 | ||
1361 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1362 | if (!resp) | |
1363 | return -ENOMEM; | |
1364 | ||
1365 | /* Do a Get Device ID command, since it is required. */ | |
1366 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1367 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1368 | rv = do_cmd(client, 2, msg, &len, resp); | |
1369 | if (rv) | |
1370 | rv = -ENODEV; | |
88f65f90 CM |
1371 | else { |
1372 | if (len < 3) { | |
1373 | rv = -ENODEV; | |
1374 | } else { | |
1375 | struct ipmi_device_id id; | |
1376 | ||
1377 | rv = ipmi_demangle_device_id(resp[0] >> 2, resp[1], | |
1378 | resp + 2, len - 2, &id); | |
1379 | if (rv) | |
1380 | rv = -ENODEV; /* Error means a BMC probably isn't there. */ | |
1381 | } | |
1382 | if (!rv && info) | |
d134ad25 | 1383 | strscpy(info->type, DEVICE_NAME, I2C_NAME_SIZE); |
88f65f90 | 1384 | } |
25930707 CM |
1385 | kfree(resp); |
1386 | return rv; | |
1387 | } | |
1388 | ||
b0e9aaa9 CM |
1389 | static int strcmp_nospace(char *s1, char *s2) |
1390 | { | |
1391 | while (*s1 && *s2) { | |
1392 | while (isspace(*s1)) | |
1393 | s1++; | |
1394 | while (isspace(*s2)) | |
1395 | s2++; | |
1396 | if (*s1 > *s2) | |
1397 | return 1; | |
1398 | if (*s1 < *s2) | |
1399 | return -1; | |
1400 | s1++; | |
1401 | s2++; | |
1402 | } | |
1403 | return 0; | |
1404 | } | |
1405 | ||
25930707 CM |
1406 | static struct ssif_addr_info *ssif_info_find(unsigned short addr, |
1407 | char *adapter_name, | |
1408 | bool match_null_name) | |
1409 | { | |
1410 | struct ssif_addr_info *info, *found = NULL; | |
1411 | ||
1412 | restart: | |
1413 | list_for_each_entry(info, &ssif_infos, link) { | |
1414 | if (info->binfo.addr == addr) { | |
b8d72e32 | 1415 | if (info->addr_src == SI_SMBIOS && !info->adapter_name) |
c4436c91 KP |
1416 | info->adapter_name = kstrdup(adapter_name, |
1417 | GFP_KERNEL); | |
1418 | ||
25930707 CM |
1419 | if (info->adapter_name || adapter_name) { |
1420 | if (!info->adapter_name != !adapter_name) { | |
1421 | /* One is NULL and one is not */ | |
1422 | continue; | |
1423 | } | |
b0e9aaa9 CM |
1424 | if (adapter_name && |
1425 | strcmp_nospace(info->adapter_name, | |
1426 | adapter_name)) | |
1427 | /* Names do not match */ | |
25930707 CM |
1428 | continue; |
1429 | } | |
1430 | found = info; | |
1431 | break; | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | if (!found && match_null_name) { | |
1436 | /* Try to get an exact match first, then try with a NULL name */ | |
1437 | adapter_name = NULL; | |
1438 | match_null_name = false; | |
1439 | goto restart; | |
1440 | } | |
1441 | ||
1442 | return found; | |
1443 | } | |
1444 | ||
1445 | static bool check_acpi(struct ssif_info *ssif_info, struct device *dev) | |
1446 | { | |
1447 | #ifdef CONFIG_ACPI | |
1448 | acpi_handle acpi_handle; | |
1449 | ||
1450 | acpi_handle = ACPI_HANDLE(dev); | |
1451 | if (acpi_handle) { | |
1452 | ssif_info->addr_source = SI_ACPI; | |
1453 | ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle; | |
e87443a5 | 1454 | request_module_nowait("acpi_ipmi"); |
25930707 CM |
1455 | return true; |
1456 | } | |
1457 | #endif | |
1458 | return false; | |
1459 | } | |
1460 | ||
94671710 CM |
1461 | static int find_slave_address(struct i2c_client *client, int slave_addr) |
1462 | { | |
0944d889 CM |
1463 | #ifdef CONFIG_IPMI_DMI_DECODE |
1464 | if (!slave_addr) | |
1465 | slave_addr = ipmi_dmi_get_slave_addr( | |
95e300c0 | 1466 | SI_TYPE_INVALID, |
0944d889 CM |
1467 | i2c_adapter_id(client->adapter), |
1468 | client->addr); | |
1469 | #endif | |
94671710 CM |
1470 | |
1471 | return slave_addr; | |
1472 | } | |
1473 | ||
10042504 CM |
1474 | static int start_multipart_test(struct i2c_client *client, |
1475 | unsigned char *msg, bool do_middle) | |
1476 | { | |
1477 | int retry_cnt = SSIF_SEND_RETRIES, ret; | |
1478 | ||
1479 | retry_write: | |
1480 | ret = i2c_smbus_write_block_data(client, | |
1481 | SSIF_IPMI_MULTI_PART_REQUEST_START, | |
1482 | 32, msg); | |
1483 | if (ret) { | |
1484 | retry_cnt--; | |
00bb7e76 CM |
1485 | if (retry_cnt > 0) { |
1486 | msleep(SSIF_REQ_RETRY_MSEC); | |
10042504 | 1487 | goto retry_write; |
00bb7e76 | 1488 | } |
10042504 CM |
1489 | 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"); |
1490 | return ret; | |
1491 | } | |
1492 | ||
1493 | if (!do_middle) | |
1494 | return 0; | |
1495 | ||
1496 | ret = i2c_smbus_write_block_data(client, | |
1497 | SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, | |
1498 | 32, msg + 32); | |
1499 | if (ret) { | |
1500 | 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"); | |
1501 | return ret; | |
1502 | } | |
1503 | ||
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | static void test_multipart_messages(struct i2c_client *client, | |
1508 | struct ssif_info *ssif_info, | |
1509 | unsigned char *resp) | |
1510 | { | |
1511 | unsigned char msg[65]; | |
1512 | int ret; | |
1513 | bool do_middle; | |
1514 | ||
1515 | if (ssif_info->max_xmit_msg_size <= 32) | |
1516 | return; | |
1517 | ||
1518 | do_middle = ssif_info->max_xmit_msg_size > 63; | |
1519 | ||
1520 | memset(msg, 0, sizeof(msg)); | |
1521 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1522 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1523 | ||
1524 | /* | |
1525 | * The specification is all messed up dealing with sending | |
1526 | * multi-part messages. Per what the specification says, it | |
1527 | * is impossible to send a message that is a multiple of 32 | |
1528 | * bytes, except for 32 itself. It talks about a "start" | |
1529 | * transaction (cmd=6) that must be 32 bytes, "middle" | |
1530 | * transaction (cmd=7) that must be 32 bytes, and an "end" | |
1531 | * transaction. The "end" transaction is shown as cmd=7 in | |
1532 | * the text, but if that's the case there is no way to | |
1533 | * differentiate between a middle and end part except the | |
1534 | * length being less than 32. But there is a table at the far | |
1535 | * end of the section (that I had never noticed until someone | |
1536 | * pointed it out to me) that mentions it as cmd=8. | |
1537 | * | |
1538 | * After some thought, I think the example is wrong and the | |
1539 | * end transaction should be cmd=8. But some systems don't | |
1540 | * implement cmd=8, they use a zero-length end transaction, | |
1541 | * even though that violates the SMBus specification. | |
1542 | * | |
1543 | * So, to work around this, this code tests if cmd=8 works. | |
1544 | * If it does, then we use that. If not, it tests zero- | |
1545 | * byte end transactions. If that works, good. If not, | |
1546 | * we only allow 63-byte transactions max. | |
1547 | */ | |
1548 | ||
1549 | ret = start_multipart_test(client, msg, do_middle); | |
1550 | if (ret) | |
1551 | goto out_no_multi_part; | |
1552 | ||
1553 | ret = i2c_smbus_write_block_data(client, | |
1554 | SSIF_IPMI_MULTI_PART_REQUEST_END, | |
1555 | 1, msg + 64); | |
1556 | ||
1557 | if (!ret) | |
1558 | ret = read_response(client, resp); | |
1559 | ||
1560 | if (ret > 0) { | |
1561 | /* End transactions work, we are good. */ | |
1562 | ssif_info->cmd8_works = true; | |
1563 | return; | |
1564 | } | |
1565 | ||
1566 | ret = start_multipart_test(client, msg, do_middle); | |
1567 | if (ret) { | |
1568 | dev_err(&client->dev, "Second multipart test failed.\n"); | |
1569 | goto out_no_multi_part; | |
1570 | } | |
1571 | ||
1572 | ret = i2c_smbus_write_block_data(client, | |
1573 | SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, | |
1574 | 0, msg + 64); | |
1575 | if (!ret) | |
1576 | ret = read_response(client, resp); | |
1577 | if (ret > 0) | |
1578 | /* Zero-size end parts work, use those. */ | |
1579 | return; | |
1580 | ||
1581 | /* Limit to 63 bytes and use a short middle command to mark the end. */ | |
1582 | if (ssif_info->max_xmit_msg_size > 63) | |
1583 | ssif_info->max_xmit_msg_size = 63; | |
1584 | return; | |
1585 | ||
1586 | out_no_multi_part: | |
1587 | ssif_info->max_xmit_msg_size = 32; | |
1588 | return; | |
1589 | } | |
1590 | ||
91620521 CM |
1591 | /* |
1592 | * Global enables we care about. | |
1593 | */ | |
1594 | #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ | |
1595 | IPMI_BMC_EVT_MSG_INTR) | |
1596 | ||
c4436c91 KP |
1597 | static void ssif_remove_dup(struct i2c_client *client) |
1598 | { | |
1599 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
1600 | ||
1601 | ipmi_unregister_smi(ssif_info->intf); | |
1602 | kfree(ssif_info); | |
1603 | } | |
1604 | ||
1605 | static int ssif_add_infos(struct i2c_client *client) | |
1606 | { | |
1607 | struct ssif_addr_info *info; | |
1608 | ||
1609 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
1610 | if (!info) | |
1611 | return -ENOMEM; | |
1612 | info->addr_src = SI_ACPI; | |
1613 | info->client = client; | |
1614 | info->adapter_name = kstrdup(client->adapter->name, GFP_KERNEL); | |
c5586d0f JJ |
1615 | if (!info->adapter_name) { |
1616 | kfree(info); | |
1617 | return -ENOMEM; | |
1618 | } | |
1619 | ||
c4436c91 KP |
1620 | info->binfo.addr = client->addr; |
1621 | list_add_tail(&info->link, &ssif_infos); | |
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * Prefer ACPI over SMBIOS, if both are available. | |
1627 | * So if we get an ACPI interface and have already registered a SMBIOS | |
1628 | * interface at the same address, remove the SMBIOS and add the ACPI one. | |
1629 | */ | |
1630 | static int ssif_check_and_remove(struct i2c_client *client, | |
1631 | struct ssif_info *ssif_info) | |
1632 | { | |
1633 | struct ssif_addr_info *info; | |
1634 | ||
1635 | list_for_each_entry(info, &ssif_infos, link) { | |
1636 | if (!info->client) | |
1637 | return 0; | |
1638 | if (!strcmp(info->adapter_name, client->adapter->name) && | |
1639 | info->binfo.addr == client->addr) { | |
1640 | if (info->addr_src == SI_ACPI) | |
1641 | return -EEXIST; | |
1642 | ||
1643 | if (ssif_info->addr_source == SI_ACPI && | |
1644 | info->addr_src == SI_SMBIOS) { | |
1645 | dev_info(&client->dev, | |
1646 | "Removing %s-specified SSIF interface in favor of ACPI\n", | |
1647 | ipmi_addr_src_to_str(info->addr_src)); | |
1648 | ssif_remove_dup(info->client); | |
1649 | return 0; | |
1650 | } | |
1651 | } | |
1652 | } | |
1653 | return 0; | |
1654 | } | |
1655 | ||
0924c5a0 | 1656 | static int ssif_probe(struct i2c_client *client) |
25930707 CM |
1657 | { |
1658 | unsigned char msg[3]; | |
1659 | unsigned char *resp; | |
1660 | struct ssif_info *ssif_info; | |
1661 | int rv = 0; | |
8d10ea15 | 1662 | int len = 0; |
25930707 CM |
1663 | int i; |
1664 | u8 slave_addr = 0; | |
1665 | struct ssif_addr_info *addr_info = NULL; | |
1666 | ||
c4436c91 | 1667 | mutex_lock(&ssif_infos_mutex); |
25930707 | 1668 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
c4436c91 KP |
1669 | if (!resp) { |
1670 | mutex_unlock(&ssif_infos_mutex); | |
25930707 | 1671 | return -ENOMEM; |
c4436c91 | 1672 | } |
25930707 CM |
1673 | |
1674 | ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL); | |
1675 | if (!ssif_info) { | |
1676 | kfree(resp); | |
c4436c91 | 1677 | mutex_unlock(&ssif_infos_mutex); |
25930707 CM |
1678 | return -ENOMEM; |
1679 | } | |
1680 | ||
1681 | if (!check_acpi(ssif_info, &client->dev)) { | |
1682 | addr_info = ssif_info_find(client->addr, client->adapter->name, | |
1683 | true); | |
1684 | if (!addr_info) { | |
1685 | /* Must have come in through sysfs. */ | |
1686 | ssif_info->addr_source = SI_HOTMOD; | |
1687 | } else { | |
1688 | ssif_info->addr_source = addr_info->addr_src; | |
1689 | ssif_info->ssif_debug = addr_info->debug; | |
1690 | ssif_info->addr_info = addr_info->addr_info; | |
0944d889 | 1691 | addr_info->client = client; |
25930707 CM |
1692 | slave_addr = addr_info->slave_addr; |
1693 | } | |
1694 | } | |
1695 | ||
34f35f8f MYK |
1696 | ssif_info->client = client; |
1697 | i2c_set_clientdata(client, ssif_info); | |
1698 | ||
c4436c91 KP |
1699 | rv = ssif_check_and_remove(client, ssif_info); |
1700 | /* If rv is 0 and addr source is not SI_ACPI, continue probing */ | |
1701 | if (!rv && ssif_info->addr_source == SI_ACPI) { | |
1702 | rv = ssif_add_infos(client); | |
1703 | if (rv) { | |
1704 | dev_err(&client->dev, "Out of memory!, exiting ..\n"); | |
1705 | goto out; | |
1706 | } | |
1707 | } else if (rv) { | |
1708 | dev_err(&client->dev, "Not probing, Interface already present\n"); | |
1709 | goto out; | |
1710 | } | |
1711 | ||
94671710 CM |
1712 | slave_addr = find_slave_address(client, slave_addr); |
1713 | ||
83af4194 CM |
1714 | dev_info(&client->dev, |
1715 | "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n", | |
25880f7d JP |
1716 | ipmi_addr_src_to_str(ssif_info->addr_source), |
1717 | client->addr, client->adapter->name, slave_addr); | |
25930707 | 1718 | |
88f65f90 CM |
1719 | /* |
1720 | * Send a get device id command and validate its response to | |
1721 | * make sure a valid BMC is there. | |
1722 | */ | |
1723 | rv = ssif_detect(client, NULL); | |
1724 | if (rv) { | |
1725 | dev_err(&client->dev, "Not present\n"); | |
1726 | goto out; | |
1727 | } | |
1728 | ||
25930707 CM |
1729 | /* Now check for system interface capabilities */ |
1730 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1731 | msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD; | |
1732 | msg[2] = 0; /* SSIF */ | |
1733 | rv = do_cmd(client, 3, msg, &len, resp); | |
1734 | if (!rv && (len >= 3) && (resp[2] == 0)) { | |
1735 | if (len < 7) { | |
1736 | if (ssif_dbg_probe) | |
83af4194 CM |
1737 | dev_dbg(&ssif_info->client->dev, |
1738 | "SSIF info too short: %d\n", len); | |
25930707 CM |
1739 | goto no_support; |
1740 | } | |
1741 | ||
1742 | /* Got a good SSIF response, handle it. */ | |
1743 | ssif_info->max_xmit_msg_size = resp[5]; | |
1744 | ssif_info->max_recv_msg_size = resp[6]; | |
1745 | ssif_info->multi_support = (resp[4] >> 6) & 0x3; | |
1746 | ssif_info->supports_pec = (resp[4] >> 3) & 0x1; | |
1747 | ||
1748 | /* Sanitize the data */ | |
1749 | switch (ssif_info->multi_support) { | |
1750 | case SSIF_NO_MULTI: | |
1751 | if (ssif_info->max_xmit_msg_size > 32) | |
1752 | ssif_info->max_xmit_msg_size = 32; | |
1753 | if (ssif_info->max_recv_msg_size > 32) | |
1754 | ssif_info->max_recv_msg_size = 32; | |
1755 | break; | |
1756 | ||
1757 | case SSIF_MULTI_2_PART: | |
3d69d43b CM |
1758 | if (ssif_info->max_xmit_msg_size > 63) |
1759 | ssif_info->max_xmit_msg_size = 63; | |
25930707 CM |
1760 | if (ssif_info->max_recv_msg_size > 62) |
1761 | ssif_info->max_recv_msg_size = 62; | |
1762 | break; | |
1763 | ||
1764 | case SSIF_MULTI_n_PART: | |
10042504 | 1765 | /* We take whatever size given, but do some testing. */ |
25930707 CM |
1766 | break; |
1767 | ||
1768 | default: | |
1769 | /* Data is not sane, just give up. */ | |
1770 | goto no_support; | |
1771 | } | |
1772 | } else { | |
1773 | no_support: | |
1774 | /* Assume no multi-part or PEC support */ | |
83af4194 CM |
1775 | dev_info(&ssif_info->client->dev, |
1776 | "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n", | |
25880f7d | 1777 | rv, len, resp[2]); |
25930707 CM |
1778 | |
1779 | ssif_info->max_xmit_msg_size = 32; | |
1780 | ssif_info->max_recv_msg_size = 32; | |
1781 | ssif_info->multi_support = SSIF_NO_MULTI; | |
1782 | ssif_info->supports_pec = 0; | |
1783 | } | |
1784 | ||
10042504 CM |
1785 | test_multipart_messages(client, ssif_info, resp); |
1786 | ||
25930707 CM |
1787 | /* Make sure the NMI timeout is cleared. */ |
1788 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1789 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
1790 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
1791 | rv = do_cmd(client, 3, msg, &len, resp); | |
1792 | if (rv || (len < 3) || (resp[2] != 0)) | |
83af4194 CM |
1793 | dev_warn(&ssif_info->client->dev, |
1794 | "Unable to clear message flags: %d %d %2.2x\n", | |
1795 | rv, len, resp[2]); | |
25930707 CM |
1796 | |
1797 | /* Attempt to enable the event buffer. */ | |
1798 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1799 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1800 | rv = do_cmd(client, 2, msg, &len, resp); | |
1801 | if (rv || (len < 4) || (resp[2] != 0)) { | |
83af4194 CM |
1802 | dev_warn(&ssif_info->client->dev, |
1803 | "Error getting global enables: %d %d %2.2x\n", | |
1804 | rv, len, resp[2]); | |
25930707 CM |
1805 | rv = 0; /* Not fatal */ |
1806 | goto found; | |
1807 | } | |
1808 | ||
91620521 CM |
1809 | ssif_info->global_enables = resp[3]; |
1810 | ||
25930707 CM |
1811 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
1812 | ssif_info->has_event_buffer = true; | |
1813 | /* buffer is already enabled, nothing to do. */ | |
1814 | goto found; | |
1815 | } | |
1816 | ||
1817 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1818 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
91620521 | 1819 | msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF; |
25930707 CM |
1820 | rv = do_cmd(client, 3, msg, &len, resp); |
1821 | if (rv || (len < 2)) { | |
83af4194 CM |
1822 | dev_warn(&ssif_info->client->dev, |
1823 | "Error setting global enables: %d %d %2.2x\n", | |
1824 | rv, len, resp[2]); | |
25930707 CM |
1825 | rv = 0; /* Not fatal */ |
1826 | goto found; | |
1827 | } | |
1828 | ||
91620521 | 1829 | if (resp[2] == 0) { |
25930707 CM |
1830 | /* A successful return means the event buffer is supported. */ |
1831 | ssif_info->has_event_buffer = true; | |
91620521 CM |
1832 | ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF; |
1833 | } | |
1834 | ||
bf2d0877 CM |
1835 | /* Some systems don't behave well if you enable alerts. */ |
1836 | if (alerts_broken) | |
1837 | goto found; | |
1838 | ||
91620521 CM |
1839 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
1840 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1841 | msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR; | |
1842 | rv = do_cmd(client, 3, msg, &len, resp); | |
1843 | if (rv || (len < 2)) { | |
83af4194 CM |
1844 | dev_warn(&ssif_info->client->dev, |
1845 | "Error setting global enables: %d %d %2.2x\n", | |
1846 | rv, len, resp[2]); | |
91620521 CM |
1847 | rv = 0; /* Not fatal */ |
1848 | goto found; | |
1849 | } | |
1850 | ||
1851 | if (resp[2] == 0) { | |
1852 | /* A successful return means the alert is supported. */ | |
1853 | ssif_info->supports_alert = true; | |
1854 | ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR; | |
1855 | } | |
25930707 CM |
1856 | |
1857 | found: | |
25930707 | 1858 | if (ssif_dbg_probe) { |
83af4194 CM |
1859 | dev_dbg(&ssif_info->client->dev, |
1860 | "%s: i2c_probe found device at i2c address %x\n", | |
1861 | __func__, client->addr); | |
25930707 CM |
1862 | } |
1863 | ||
1864 | spin_lock_init(&ssif_info->lock); | |
8230831c | 1865 | ssif_info->ssif_state = SSIF_IDLE; |
e99e88a9 | 1866 | timer_setup(&ssif_info->retry_timer, retry_timeout, 0); |
a1466ec5 | 1867 | timer_setup(&ssif_info->watch_timer, watch_timeout, 0); |
25930707 CM |
1868 | |
1869 | for (i = 0; i < SSIF_NUM_STATS; i++) | |
1870 | atomic_set(&ssif_info->stats[i], 0); | |
1871 | ||
1872 | if (ssif_info->supports_pec) | |
1873 | ssif_info->client->flags |= I2C_CLIENT_PEC; | |
1874 | ||
1875 | ssif_info->handlers.owner = THIS_MODULE; | |
1876 | ssif_info->handlers.start_processing = ssif_start_processing; | |
a313dec6 | 1877 | ssif_info->handlers.shutdown = shutdown_ssif; |
25930707 CM |
1878 | ssif_info->handlers.get_smi_info = get_smi_info; |
1879 | ssif_info->handlers.sender = sender; | |
1880 | ssif_info->handlers.request_events = request_events; | |
a1466ec5 | 1881 | ssif_info->handlers.set_need_watch = ssif_set_need_watch; |
25930707 CM |
1882 | |
1883 | { | |
1884 | unsigned int thread_num; | |
1885 | ||
be8647d2 CM |
1886 | thread_num = ((i2c_adapter_id(ssif_info->client->adapter) |
1887 | << 8) | | |
25930707 CM |
1888 | ssif_info->client->addr); |
1889 | init_completion(&ssif_info->wake_thread); | |
1890 | ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info, | |
1891 | "kssif%4.4x", thread_num); | |
1892 | if (IS_ERR(ssif_info->thread)) { | |
1893 | rv = PTR_ERR(ssif_info->thread); | |
1894 | dev_notice(&ssif_info->client->dev, | |
1895 | "Could not start kernel thread: error %d\n", | |
1896 | rv); | |
1897 | goto out; | |
1898 | } | |
1899 | } | |
1900 | ||
ac2673d5 CM |
1901 | dev_set_drvdata(&ssif_info->client->dev, ssif_info); |
1902 | rv = device_add_group(&ssif_info->client->dev, | |
1903 | &ipmi_ssif_dev_attr_group); | |
1904 | if (rv) { | |
1905 | dev_err(&ssif_info->client->dev, | |
1906 | "Unable to add device attributes: error %d\n", | |
1907 | rv); | |
1908 | goto out; | |
1909 | } | |
1910 | ||
25930707 CM |
1911 | rv = ipmi_register_smi(&ssif_info->handlers, |
1912 | ssif_info, | |
25930707 CM |
1913 | &ssif_info->client->dev, |
1914 | slave_addr); | |
d5a2197b | 1915 | if (rv) { |
83af4194 CM |
1916 | dev_err(&ssif_info->client->dev, |
1917 | "Unable to register device: error %d\n", rv); | |
ac2673d5 | 1918 | goto out_remove_attr; |
25930707 CM |
1919 | } |
1920 | ||
25930707 | 1921 | out: |
0944d889 | 1922 | if (rv) { |
a8627cda GS |
1923 | if (addr_info) |
1924 | addr_info->client = NULL; | |
1925 | ||
83af4194 CM |
1926 | dev_err(&ssif_info->client->dev, |
1927 | "Unable to start IPMI SSIF: %d\n", rv); | |
34f35f8f | 1928 | i2c_set_clientdata(client, NULL); |
25930707 | 1929 | kfree(ssif_info); |
0944d889 | 1930 | } |
25930707 | 1931 | kfree(resp); |
c4436c91 | 1932 | mutex_unlock(&ssif_infos_mutex); |
25930707 CM |
1933 | return rv; |
1934 | ||
ac2673d5 CM |
1935 | out_remove_attr: |
1936 | device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group); | |
1937 | dev_set_drvdata(&ssif_info->client->dev, NULL); | |
25930707 CM |
1938 | goto out; |
1939 | } | |
1940 | ||
25930707 CM |
1941 | static int new_ssif_client(int addr, char *adapter_name, |
1942 | int debug, int slave_addr, | |
0944d889 CM |
1943 | enum ipmi_addr_src addr_src, |
1944 | struct device *dev) | |
25930707 CM |
1945 | { |
1946 | struct ssif_addr_info *addr_info; | |
1947 | int rv = 0; | |
1948 | ||
1949 | mutex_lock(&ssif_infos_mutex); | |
1950 | if (ssif_info_find(addr, adapter_name, false)) { | |
1951 | rv = -EEXIST; | |
1952 | goto out_unlock; | |
1953 | } | |
1954 | ||
1955 | addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL); | |
1956 | if (!addr_info) { | |
1957 | rv = -ENOMEM; | |
1958 | goto out_unlock; | |
1959 | } | |
1960 | ||
1961 | if (adapter_name) { | |
1962 | addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL); | |
1963 | if (!addr_info->adapter_name) { | |
1964 | kfree(addr_info); | |
1965 | rv = -ENOMEM; | |
1966 | goto out_unlock; | |
1967 | } | |
1968 | } | |
1969 | ||
b00839ca | 1970 | strscpy(addr_info->binfo.type, DEVICE_NAME, |
25930707 CM |
1971 | sizeof(addr_info->binfo.type)); |
1972 | addr_info->binfo.addr = addr; | |
1973 | addr_info->binfo.platform_data = addr_info; | |
1974 | addr_info->debug = debug; | |
1975 | addr_info->slave_addr = slave_addr; | |
1976 | addr_info->addr_src = addr_src; | |
0944d889 CM |
1977 | addr_info->dev = dev; |
1978 | ||
87ff091c CM |
1979 | if (dev) |
1980 | dev_set_drvdata(dev, addr_info); | |
25930707 CM |
1981 | |
1982 | list_add_tail(&addr_info->link, &ssif_infos); | |
1983 | ||
2a556ce7 | 1984 | /* Address list will get it */ |
25930707 CM |
1985 | |
1986 | out_unlock: | |
1987 | mutex_unlock(&ssif_infos_mutex); | |
1988 | return rv; | |
1989 | } | |
1990 | ||
1991 | static void free_ssif_clients(void) | |
1992 | { | |
1993 | struct ssif_addr_info *info, *tmp; | |
1994 | ||
1995 | mutex_lock(&ssif_infos_mutex); | |
1996 | list_for_each_entry_safe(info, tmp, &ssif_infos, link) { | |
1997 | list_del(&info->link); | |
1998 | kfree(info->adapter_name); | |
1999 | kfree(info); | |
2000 | } | |
2001 | mutex_unlock(&ssif_infos_mutex); | |
2002 | } | |
2003 | ||
2004 | static unsigned short *ssif_address_list(void) | |
2005 | { | |
2006 | struct ssif_addr_info *info; | |
c75c5075 | 2007 | unsigned int count = 0, i = 0; |
25930707 CM |
2008 | unsigned short *address_list; |
2009 | ||
2010 | list_for_each_entry(info, &ssif_infos, link) | |
2011 | count++; | |
2012 | ||
6396bb22 KC |
2013 | address_list = kcalloc(count + 1, sizeof(*address_list), |
2014 | GFP_KERNEL); | |
25930707 CM |
2015 | if (!address_list) |
2016 | return NULL; | |
2017 | ||
25930707 CM |
2018 | list_for_each_entry(info, &ssif_infos, link) { |
2019 | unsigned short addr = info->binfo.addr; | |
2020 | int j; | |
2021 | ||
2022 | for (j = 0; j < i; j++) { | |
2023 | if (address_list[j] == addr) | |
c75c5075 CM |
2024 | /* Found a dup. */ |
2025 | break; | |
25930707 | 2026 | } |
c75c5075 CM |
2027 | if (j == i) /* Didn't find it in the list. */ |
2028 | address_list[i++] = addr; | |
25930707 CM |
2029 | } |
2030 | address_list[i] = I2C_CLIENT_END; | |
2031 | ||
2032 | return address_list; | |
2033 | } | |
2034 | ||
2035 | #ifdef CONFIG_ACPI | |
5186cf9c | 2036 | static const struct acpi_device_id ssif_acpi_match[] = { |
25930707 CM |
2037 | { "IPI0001", 0 }, |
2038 | { }, | |
2039 | }; | |
2040 | MODULE_DEVICE_TABLE(acpi, ssif_acpi_match); | |
25930707 CM |
2041 | #endif |
2042 | ||
2043 | #ifdef CONFIG_DMI | |
0944d889 | 2044 | static int dmi_ipmi_probe(struct platform_device *pdev) |
25930707 | 2045 | { |
95e300c0 | 2046 | u8 slave_addr = 0; |
0944d889 CM |
2047 | u16 i2c_addr; |
2048 | int rv; | |
25930707 | 2049 | |
0944d889 CM |
2050 | if (!ssif_trydmi) |
2051 | return -ENODEV; | |
25930707 | 2052 | |
0944d889 CM |
2053 | rv = device_property_read_u16(&pdev->dev, "i2c-addr", &i2c_addr); |
2054 | if (rv) { | |
25880f7d | 2055 | dev_warn(&pdev->dev, "No i2c-addr property\n"); |
0944d889 | 2056 | return -ENODEV; |
25930707 CM |
2057 | } |
2058 | ||
0944d889 CM |
2059 | rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr); |
2060 | if (rv) | |
ed6c3a6d | 2061 | slave_addr = 0x20; |
25930707 | 2062 | |
0944d889 CM |
2063 | return new_ssif_client(i2c_addr, NULL, 0, |
2064 | slave_addr, SI_SMBIOS, &pdev->dev); | |
25930707 CM |
2065 | } |
2066 | #else | |
0944d889 CM |
2067 | static int dmi_ipmi_probe(struct platform_device *pdev) |
2068 | { | |
2069 | return -ENODEV; | |
2070 | } | |
25930707 CM |
2071 | #endif |
2072 | ||
2073 | static const struct i2c_device_id ssif_id[] = { | |
19a01155 | 2074 | { DEVICE_NAME }, |
25930707 CM |
2075 | { } |
2076 | }; | |
2077 | MODULE_DEVICE_TABLE(i2c, ssif_id); | |
2078 | ||
2079 | static struct i2c_driver ssif_i2c_driver = { | |
2080 | .class = I2C_CLASS_HWMON, | |
2081 | .driver = { | |
25930707 CM |
2082 | .name = DEVICE_NAME |
2083 | }, | |
e64c82b8 | 2084 | .probe = ssif_probe, |
25930707 | 2085 | .remove = ssif_remove, |
91620521 | 2086 | .alert = ssif_alert, |
25930707 CM |
2087 | .id_table = ssif_id, |
2088 | .detect = ssif_detect | |
2089 | }; | |
2090 | ||
0944d889 CM |
2091 | static int ssif_platform_probe(struct platform_device *dev) |
2092 | { | |
2093 | return dmi_ipmi_probe(dev); | |
2094 | } | |
2095 | ||
a69da502 | 2096 | static void ssif_platform_remove(struct platform_device *dev) |
0944d889 CM |
2097 | { |
2098 | struct ssif_addr_info *addr_info = dev_get_drvdata(&dev->dev); | |
2099 | ||
0944d889 | 2100 | mutex_lock(&ssif_infos_mutex); |
0944d889 CM |
2101 | list_del(&addr_info->link); |
2102 | kfree(addr_info); | |
2103 | mutex_unlock(&ssif_infos_mutex); | |
0944d889 CM |
2104 | } |
2105 | ||
b3096c70 CM |
2106 | static const struct platform_device_id ssif_plat_ids[] = { |
2107 | { "dmi-ipmi-ssif", 0 }, | |
2108 | { } | |
2109 | }; | |
0e38f7ec | 2110 | MODULE_DEVICE_TABLE(platform, ssif_plat_ids); |
b3096c70 | 2111 | |
0944d889 CM |
2112 | static struct platform_driver ipmi_driver = { |
2113 | .driver = { | |
2114 | .name = DEVICE_NAME, | |
2115 | }, | |
2116 | .probe = ssif_platform_probe, | |
a69da502 | 2117 | .remove_new = ssif_platform_remove, |
b3096c70 | 2118 | .id_table = ssif_plat_ids |
0944d889 CM |
2119 | }; |
2120 | ||
ec7174f6 | 2121 | static int __init init_ipmi_ssif(void) |
25930707 CM |
2122 | { |
2123 | int i; | |
2124 | int rv; | |
2125 | ||
2126 | if (initialized) | |
2127 | return 0; | |
2128 | ||
2129 | pr_info("IPMI SSIF Interface driver\n"); | |
2130 | ||
2131 | /* build list for i2c from addr list */ | |
2132 | for (i = 0; i < num_addrs; i++) { | |
2133 | rv = new_ssif_client(addr[i], adapter_name[i], | |
2134 | dbg[i], slave_addrs[i], | |
0944d889 | 2135 | SI_HARDCODED, NULL); |
d467f7a4 | 2136 | if (rv) |
25880f7d | 2137 | pr_err("Couldn't add hardcoded device at addr 0x%x\n", |
25930707 CM |
2138 | addr[i]); |
2139 | } | |
2140 | ||
2141 | if (ssif_tryacpi) | |
2142 | ssif_i2c_driver.driver.acpi_match_table = | |
2143 | ACPI_PTR(ssif_acpi_match); | |
0944d889 | 2144 | |
0944d889 CM |
2145 | if (ssif_trydmi) { |
2146 | rv = platform_driver_register(&ipmi_driver); | |
2147 | if (rv) | |
25880f7d | 2148 | pr_err("Unable to register driver: %d\n", rv); |
2cd0e544 KW |
2149 | else |
2150 | platform_registered = true; | |
0944d889 CM |
2151 | } |
2152 | ||
25930707 CM |
2153 | ssif_i2c_driver.address_list = ssif_address_list(); |
2154 | ||
2155 | rv = i2c_add_driver(&ssif_i2c_driver); | |
2156 | if (!rv) | |
2157 | initialized = true; | |
2158 | ||
2159 | return rv; | |
2160 | } | |
2161 | module_init(init_ipmi_ssif); | |
2162 | ||
ec7174f6 | 2163 | static void __exit cleanup_ipmi_ssif(void) |
25930707 CM |
2164 | { |
2165 | if (!initialized) | |
2166 | return; | |
2167 | ||
2168 | initialized = false; | |
2169 | ||
2170 | i2c_del_driver(&ssif_i2c_driver); | |
2171 | ||
36e398d7 CM |
2172 | kfree(ssif_i2c_driver.address_list); |
2173 | ||
2cd0e544 | 2174 | if (ssif_trydmi && platform_registered) |
44f56a39 | 2175 | platform_driver_unregister(&ipmi_driver); |
0944d889 | 2176 | |
25930707 CM |
2177 | free_ssif_clients(); |
2178 | } | |
2179 | module_exit(cleanup_ipmi_ssif); | |
2180 | ||
0944d889 | 2181 | MODULE_ALIAS("platform:dmi-ipmi-ssif"); |
25930707 CM |
2182 | MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>"); |
2183 | MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus"); | |
2184 | MODULE_LICENSE("GPL"); |