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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 | ||
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 | 30 | #define pr_fmt(fmt) "ipmi_ssif: " fmt |
83af4194 | 31 | #define dev_fmt(fmt) "ipmi_ssif: " fmt |
25880f7d | 32 | |
25930707 CM |
33 | #if defined(MODVERSIONS) |
34 | #include <linux/modversions.h> | |
35 | #endif | |
36 | ||
37 | #include <linux/module.h> | |
38 | #include <linux/moduleparam.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/seq_file.h> | |
41 | #include <linux/timer.h> | |
42 | #include <linux/delay.h> | |
43 | #include <linux/errno.h> | |
44 | #include <linux/spinlock.h> | |
45 | #include <linux/slab.h> | |
46 | #include <linux/list.h> | |
47 | #include <linux/i2c.h> | |
48 | #include <linux/ipmi_smi.h> | |
49 | #include <linux/init.h> | |
50 | #include <linux/dmi.h> | |
51 | #include <linux/kthread.h> | |
52 | #include <linux/acpi.h> | |
e3fe1427 | 53 | #include <linux/ctype.h> |
526290aa | 54 | #include <linux/time64.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 | ||
a1466ec5 CM |
93 | /* |
94 | * Timeout for the watch, only used for get flag timer. | |
95 | */ | |
c65ea996 CM |
96 | #define SSIF_WATCH_MSG_TIMEOUT msecs_to_jiffies(10) |
97 | #define SSIF_WATCH_WATCHDOG_TIMEOUT msecs_to_jiffies(250) | |
a1466ec5 | 98 | |
25930707 CM |
99 | enum ssif_intf_state { |
100 | SSIF_NORMAL, | |
101 | SSIF_GETTING_FLAGS, | |
102 | SSIF_GETTING_EVENTS, | |
103 | SSIF_CLEARING_FLAGS, | |
104 | SSIF_GETTING_MESSAGES, | |
105 | /* FIXME - add watchdog stuff. */ | |
106 | }; | |
107 | ||
108 | #define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \ | |
109 | && (ssif)->curr_msg == NULL) | |
110 | ||
111 | /* | |
112 | * Indexes into stats[] in ssif_info below. | |
113 | */ | |
114 | enum ssif_stat_indexes { | |
115 | /* Number of total messages sent. */ | |
116 | SSIF_STAT_sent_messages = 0, | |
117 | ||
118 | /* | |
119 | * Number of message parts sent. Messages may be broken into | |
120 | * parts if they are long. | |
121 | */ | |
122 | SSIF_STAT_sent_messages_parts, | |
123 | ||
124 | /* | |
125 | * Number of time a message was retried. | |
126 | */ | |
127 | SSIF_STAT_send_retries, | |
128 | ||
129 | /* | |
130 | * Number of times the send of a message failed. | |
131 | */ | |
132 | SSIF_STAT_send_errors, | |
133 | ||
134 | /* | |
135 | * Number of message responses received. | |
136 | */ | |
137 | SSIF_STAT_received_messages, | |
138 | ||
139 | /* | |
140 | * Number of message fragments received. | |
141 | */ | |
142 | SSIF_STAT_received_message_parts, | |
143 | ||
144 | /* | |
145 | * Number of times the receive of a message was retried. | |
146 | */ | |
147 | SSIF_STAT_receive_retries, | |
148 | ||
149 | /* | |
150 | * Number of errors receiving messages. | |
151 | */ | |
152 | SSIF_STAT_receive_errors, | |
153 | ||
154 | /* | |
155 | * Number of times a flag fetch was requested. | |
156 | */ | |
157 | SSIF_STAT_flag_fetches, | |
158 | ||
159 | /* | |
160 | * Number of times the hardware didn't follow the state machine. | |
161 | */ | |
162 | SSIF_STAT_hosed, | |
163 | ||
164 | /* | |
165 | * Number of received events. | |
166 | */ | |
167 | SSIF_STAT_events, | |
168 | ||
169 | /* Number of asyncronous messages received. */ | |
170 | SSIF_STAT_incoming_messages, | |
171 | ||
172 | /* Number of watchdog pretimeouts. */ | |
173 | SSIF_STAT_watchdog_pretimeouts, | |
174 | ||
91620521 CM |
175 | /* Number of alers received. */ |
176 | SSIF_STAT_alerts, | |
177 | ||
25930707 CM |
178 | /* Always add statistics before this value, it must be last. */ |
179 | SSIF_NUM_STATS | |
180 | }; | |
181 | ||
182 | struct ssif_addr_info { | |
25930707 CM |
183 | struct i2c_board_info binfo; |
184 | char *adapter_name; | |
185 | int debug; | |
186 | int slave_addr; | |
187 | enum ipmi_addr_src addr_src; | |
188 | union ipmi_smi_info_union addr_info; | |
0944d889 CM |
189 | struct device *dev; |
190 | struct i2c_client *client; | |
25930707 | 191 | |
0745dde6 CM |
192 | struct i2c_client *added_client; |
193 | ||
25930707 CM |
194 | struct mutex clients_mutex; |
195 | struct list_head clients; | |
196 | ||
197 | struct list_head link; | |
198 | }; | |
199 | ||
200 | struct ssif_info; | |
201 | ||
202 | typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result, | |
203 | unsigned char *data, unsigned int len); | |
204 | ||
205 | struct ssif_info { | |
a567b623 | 206 | struct ipmi_smi *intf; |
25930707 CM |
207 | spinlock_t lock; |
208 | struct ipmi_smi_msg *waiting_msg; | |
209 | struct ipmi_smi_msg *curr_msg; | |
210 | enum ssif_intf_state ssif_state; | |
211 | unsigned long ssif_debug; | |
212 | ||
213 | struct ipmi_smi_handlers handlers; | |
214 | ||
215 | enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */ | |
216 | union ipmi_smi_info_union addr_info; | |
217 | ||
218 | /* | |
219 | * Flags from the last GET_MSG_FLAGS command, used when an ATTN | |
220 | * is set to hold the flags until we are done handling everything | |
221 | * from the flags. | |
222 | */ | |
223 | #define RECEIVE_MSG_AVAIL 0x01 | |
224 | #define EVENT_MSG_BUFFER_FULL 0x02 | |
225 | #define WDT_PRE_TIMEOUT_INT 0x08 | |
226 | unsigned char msg_flags; | |
227 | ||
91620521 | 228 | u8 global_enables; |
25930707 | 229 | bool has_event_buffer; |
91620521 CM |
230 | bool supports_alert; |
231 | ||
232 | /* | |
233 | * Used to tell what we should do with alerts. If we are | |
234 | * waiting on a response, read the data immediately. | |
235 | */ | |
236 | bool got_alert; | |
237 | bool waiting_alert; | |
25930707 CM |
238 | |
239 | /* | |
240 | * If set to true, this will request events the next time the | |
241 | * state machine is idle. | |
242 | */ | |
243 | bool req_events; | |
244 | ||
245 | /* | |
246 | * If set to true, this will request flags the next time the | |
247 | * state machine is idle. | |
248 | */ | |
249 | bool req_flags; | |
250 | ||
251 | /* | |
252 | * Used to perform timer operations when run-to-completion | |
253 | * mode is on. This is a countdown timer. | |
254 | */ | |
255 | int rtc_us_timer; | |
256 | ||
257 | /* Used for sending/receiving data. +1 for the length. */ | |
258 | unsigned char data[IPMI_MAX_MSG_LENGTH + 1]; | |
259 | unsigned int data_len; | |
260 | ||
261 | /* Temp receive buffer, gets copied into data. */ | |
262 | unsigned char recv[I2C_SMBUS_BLOCK_MAX]; | |
263 | ||
264 | struct i2c_client *client; | |
265 | ssif_i2c_done done_handler; | |
266 | ||
267 | /* Thread interface handling */ | |
268 | struct task_struct *thread; | |
269 | struct completion wake_thread; | |
270 | bool stopping; | |
271 | int i2c_read_write; | |
272 | int i2c_command; | |
273 | unsigned char *i2c_data; | |
274 | unsigned int i2c_size; | |
275 | ||
25930707 CM |
276 | struct timer_list retry_timer; |
277 | int retries_left; | |
278 | ||
c65ea996 | 279 | long watch_timeout; /* Timeout for flags check, 0 if off. */ |
a1466ec5 CM |
280 | struct timer_list watch_timer; /* Flag fetch timer. */ |
281 | ||
25930707 CM |
282 | /* Info from SSIF cmd */ |
283 | unsigned char max_xmit_msg_size; | |
284 | unsigned char max_recv_msg_size; | |
10042504 | 285 | bool cmd8_works; /* See test_multipart_messages() for details. */ |
25930707 CM |
286 | unsigned int multi_support; |
287 | int supports_pec; | |
288 | ||
289 | #define SSIF_NO_MULTI 0 | |
290 | #define SSIF_MULTI_2_PART 1 | |
291 | #define SSIF_MULTI_n_PART 2 | |
292 | unsigned char *multi_data; | |
293 | unsigned int multi_len; | |
294 | unsigned int multi_pos; | |
295 | ||
296 | atomic_t stats[SSIF_NUM_STATS]; | |
297 | }; | |
298 | ||
299 | #define ssif_inc_stat(ssif, stat) \ | |
300 | atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat]) | |
301 | #define ssif_get_stat(ssif, stat) \ | |
302 | ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat])) | |
303 | ||
304 | static bool initialized; | |
2cd0e544 | 305 | static bool platform_registered; |
25930707 | 306 | |
25930707 CM |
307 | static void return_hosed_msg(struct ssif_info *ssif_info, |
308 | struct ipmi_smi_msg *msg); | |
309 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags); | |
310 | static int start_send(struct ssif_info *ssif_info, | |
311 | unsigned char *data, | |
312 | unsigned int len); | |
313 | ||
314 | static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info, | |
315 | unsigned long *flags) | |
562bf770 | 316 | __acquires(&ssif_info->lock) |
25930707 CM |
317 | { |
318 | spin_lock_irqsave(&ssif_info->lock, *flags); | |
319 | return flags; | |
320 | } | |
321 | ||
322 | static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info, | |
323 | unsigned long *flags) | |
562bf770 | 324 | __releases(&ssif_info->lock) |
25930707 CM |
325 | { |
326 | spin_unlock_irqrestore(&ssif_info->lock, *flags); | |
327 | } | |
328 | ||
329 | static void deliver_recv_msg(struct ssif_info *ssif_info, | |
330 | struct ipmi_smi_msg *msg) | |
331 | { | |
0fbecb4f | 332 | if (msg->rsp_size < 0) { |
25930707 | 333 | return_hosed_msg(ssif_info, msg); |
83af4194 CM |
334 | dev_err(&ssif_info->client->dev, |
335 | "%s: Malformed message: rsp_size = %d\n", | |
25880f7d | 336 | __func__, msg->rsp_size); |
25930707 | 337 | } else { |
0fbecb4f | 338 | ipmi_smi_msg_received(ssif_info->intf, msg); |
25930707 CM |
339 | } |
340 | } | |
341 | ||
342 | static void return_hosed_msg(struct ssif_info *ssif_info, | |
343 | struct ipmi_smi_msg *msg) | |
344 | { | |
345 | ssif_inc_stat(ssif_info, hosed); | |
346 | ||
347 | /* Make it a response */ | |
348 | msg->rsp[0] = msg->data[0] | 4; | |
349 | msg->rsp[1] = msg->data[1]; | |
350 | msg->rsp[2] = 0xFF; /* Unknown error. */ | |
351 | msg->rsp_size = 3; | |
352 | ||
353 | deliver_recv_msg(ssif_info, msg); | |
354 | } | |
355 | ||
356 | /* | |
357 | * Must be called with the message lock held. This will release the | |
358 | * message lock. Note that the caller will check SSIF_IDLE and start a | |
359 | * new operation, so there is no need to check for new messages to | |
360 | * start in here. | |
361 | */ | |
362 | static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
363 | { | |
364 | unsigned char msg[3]; | |
365 | ||
366 | ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; | |
367 | ssif_info->ssif_state = SSIF_CLEARING_FLAGS; | |
368 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
369 | ||
370 | /* Make sure the watchdog pre-timeout flag is not set at startup. */ | |
371 | msg[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
372 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
373 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
374 | ||
375 | if (start_send(ssif_info, msg, 3) != 0) { | |
376 | /* Error, just go to normal state. */ | |
377 | ssif_info->ssif_state = SSIF_NORMAL; | |
378 | } | |
379 | } | |
380 | ||
381 | static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags) | |
382 | { | |
383 | unsigned char mb[2]; | |
384 | ||
385 | ssif_info->req_flags = false; | |
386 | ssif_info->ssif_state = SSIF_GETTING_FLAGS; | |
387 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
388 | ||
389 | mb[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
390 | mb[1] = IPMI_GET_MSG_FLAGS_CMD; | |
391 | if (start_send(ssif_info, mb, 2) != 0) | |
392 | ssif_info->ssif_state = SSIF_NORMAL; | |
393 | } | |
394 | ||
395 | static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags, | |
396 | struct ipmi_smi_msg *msg) | |
397 | { | |
398 | if (start_send(ssif_info, msg->data, msg->data_size) != 0) { | |
399 | unsigned long oflags; | |
400 | ||
401 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
402 | ssif_info->curr_msg = NULL; | |
403 | ssif_info->ssif_state = SSIF_NORMAL; | |
404 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
405 | ipmi_free_smi_msg(msg); | |
406 | } | |
407 | } | |
408 | ||
409 | static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags) | |
410 | { | |
411 | struct ipmi_smi_msg *msg; | |
412 | ||
413 | ssif_info->req_events = false; | |
414 | ||
415 | msg = ipmi_alloc_smi_msg(); | |
416 | if (!msg) { | |
417 | ssif_info->ssif_state = SSIF_NORMAL; | |
cf9806f3 | 418 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
419 | return; |
420 | } | |
421 | ||
422 | ssif_info->curr_msg = msg; | |
423 | ssif_info->ssif_state = SSIF_GETTING_EVENTS; | |
424 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
425 | ||
426 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
427 | msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; | |
428 | msg->data_size = 2; | |
429 | ||
430 | check_start_send(ssif_info, flags, msg); | |
431 | } | |
432 | ||
433 | static void start_recv_msg_fetch(struct ssif_info *ssif_info, | |
434 | unsigned long *flags) | |
435 | { | |
436 | struct ipmi_smi_msg *msg; | |
437 | ||
438 | msg = ipmi_alloc_smi_msg(); | |
439 | if (!msg) { | |
440 | ssif_info->ssif_state = SSIF_NORMAL; | |
cf9806f3 | 441 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
442 | return; |
443 | } | |
444 | ||
445 | ssif_info->curr_msg = msg; | |
446 | ssif_info->ssif_state = SSIF_GETTING_MESSAGES; | |
447 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
448 | ||
449 | msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); | |
450 | msg->data[1] = IPMI_GET_MSG_CMD; | |
451 | msg->data_size = 2; | |
452 | ||
453 | check_start_send(ssif_info, flags, msg); | |
454 | } | |
455 | ||
456 | /* | |
457 | * Must be called with the message lock held. This will release the | |
458 | * message lock. Note that the caller will check SSIF_IDLE and start a | |
459 | * new operation, so there is no need to check for new messages to | |
460 | * start in here. | |
461 | */ | |
462 | static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags) | |
463 | { | |
464 | if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) { | |
25930707 CM |
465 | /* Watchdog pre-timeout */ |
466 | ssif_inc_stat(ssif_info, watchdog_pretimeouts); | |
467 | start_clear_flags(ssif_info, flags); | |
0fbecb4f | 468 | ipmi_smi_watchdog_pretimeout(ssif_info->intf); |
25930707 CM |
469 | } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL) |
470 | /* Messages available. */ | |
471 | start_recv_msg_fetch(ssif_info, flags); | |
472 | else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL) | |
473 | /* Events available. */ | |
474 | start_event_fetch(ssif_info, flags); | |
475 | else { | |
476 | ssif_info->ssif_state = SSIF_NORMAL; | |
477 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
478 | } | |
479 | } | |
480 | ||
481 | static int ipmi_ssif_thread(void *data) | |
482 | { | |
483 | struct ssif_info *ssif_info = data; | |
484 | ||
485 | while (!kthread_should_stop()) { | |
486 | int result; | |
487 | ||
488 | /* Wait for something to do */ | |
d0acf734 CM |
489 | result = wait_for_completion_interruptible( |
490 | &ssif_info->wake_thread); | |
25930707 CM |
491 | if (ssif_info->stopping) |
492 | break; | |
d0acf734 CM |
493 | if (result == -ERESTARTSYS) |
494 | continue; | |
495 | init_completion(&ssif_info->wake_thread); | |
25930707 CM |
496 | |
497 | if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) { | |
498 | result = i2c_smbus_write_block_data( | |
3d69d43b | 499 | ssif_info->client, ssif_info->i2c_command, |
25930707 CM |
500 | ssif_info->i2c_data[0], |
501 | ssif_info->i2c_data + 1); | |
502 | ssif_info->done_handler(ssif_info, result, NULL, 0); | |
503 | } else { | |
504 | result = i2c_smbus_read_block_data( | |
3d69d43b | 505 | ssif_info->client, ssif_info->i2c_command, |
25930707 CM |
506 | ssif_info->i2c_data); |
507 | if (result < 0) | |
508 | ssif_info->done_handler(ssif_info, result, | |
509 | NULL, 0); | |
510 | else | |
511 | ssif_info->done_handler(ssif_info, 0, | |
512 | ssif_info->i2c_data, | |
513 | result); | |
514 | } | |
515 | } | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static int ssif_i2c_send(struct ssif_info *ssif_info, | |
521 | ssif_i2c_done handler, | |
522 | int read_write, int command, | |
523 | unsigned char *data, unsigned int size) | |
524 | { | |
525 | ssif_info->done_handler = handler; | |
526 | ||
527 | ssif_info->i2c_read_write = read_write; | |
528 | ssif_info->i2c_command = command; | |
529 | ssif_info->i2c_data = data; | |
530 | ssif_info->i2c_size = size; | |
531 | complete(&ssif_info->wake_thread); | |
532 | return 0; | |
533 | } | |
534 | ||
535 | ||
536 | static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
537 | unsigned char *data, unsigned int len); | |
538 | ||
91620521 | 539 | static void start_get(struct ssif_info *ssif_info) |
25930707 | 540 | { |
25930707 CM |
541 | int rv; |
542 | ||
25930707 | 543 | ssif_info->rtc_us_timer = 0; |
3d69d43b | 544 | ssif_info->multi_pos = 0; |
25930707 CM |
545 | |
546 | rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, | |
547 | SSIF_IPMI_RESPONSE, | |
548 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
549 | if (rv < 0) { | |
550 | /* request failed, just return the error. */ | |
551 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
552 | dev_dbg(&ssif_info->client->dev, |
553 | "Error from i2c_non_blocking_op(5)\n"); | |
25930707 CM |
554 | |
555 | msg_done_handler(ssif_info, -EIO, NULL, 0); | |
556 | } | |
557 | } | |
558 | ||
e99e88a9 | 559 | static void retry_timeout(struct timer_list *t) |
91620521 | 560 | { |
e99e88a9 | 561 | struct ssif_info *ssif_info = from_timer(ssif_info, t, retry_timer); |
91620521 CM |
562 | unsigned long oflags, *flags; |
563 | bool waiting; | |
564 | ||
565 | if (ssif_info->stopping) | |
566 | return; | |
567 | ||
568 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
569 | waiting = ssif_info->waiting_alert; | |
570 | ssif_info->waiting_alert = false; | |
571 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
572 | ||
573 | if (waiting) | |
574 | start_get(ssif_info); | |
575 | } | |
576 | ||
a1466ec5 CM |
577 | static void watch_timeout(struct timer_list *t) |
578 | { | |
579 | struct ssif_info *ssif_info = from_timer(ssif_info, t, watch_timer); | |
580 | unsigned long oflags, *flags; | |
581 | ||
582 | if (ssif_info->stopping) | |
583 | return; | |
584 | ||
585 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
c65ea996 | 586 | if (ssif_info->watch_timeout) { |
a1466ec5 | 587 | mod_timer(&ssif_info->watch_timer, |
c65ea996 | 588 | jiffies + ssif_info->watch_timeout); |
a1466ec5 CM |
589 | if (SSIF_IDLE(ssif_info)) { |
590 | start_flag_fetch(ssif_info, flags); /* Releases lock */ | |
591 | return; | |
592 | } | |
593 | ssif_info->req_flags = true; | |
594 | } | |
595 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
596 | } | |
91620521 | 597 | |
b4f21054 BT |
598 | static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type, |
599 | unsigned int data) | |
91620521 CM |
600 | { |
601 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
602 | unsigned long oflags, *flags; | |
603 | bool do_get = false; | |
604 | ||
b4f21054 BT |
605 | if (type != I2C_PROTOCOL_SMBUS_ALERT) |
606 | return; | |
607 | ||
91620521 CM |
608 | ssif_inc_stat(ssif_info, alerts); |
609 | ||
610 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
611 | if (ssif_info->waiting_alert) { | |
612 | ssif_info->waiting_alert = false; | |
613 | del_timer(&ssif_info->retry_timer); | |
614 | do_get = true; | |
615 | } else if (ssif_info->curr_msg) { | |
616 | ssif_info->got_alert = true; | |
617 | } | |
618 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
619 | if (do_get) | |
620 | start_get(ssif_info); | |
621 | } | |
622 | ||
25930707 CM |
623 | static int start_resend(struct ssif_info *ssif_info); |
624 | ||
625 | static void msg_done_handler(struct ssif_info *ssif_info, int result, | |
626 | unsigned char *data, unsigned int len) | |
627 | { | |
628 | struct ipmi_smi_msg *msg; | |
629 | unsigned long oflags, *flags; | |
630 | int rv; | |
631 | ||
632 | /* | |
633 | * We are single-threaded here, so no need for a lock until we | |
634 | * start messing with driver states or the queues. | |
635 | */ | |
636 | ||
637 | if (result < 0) { | |
638 | ssif_info->retries_left--; | |
639 | if (ssif_info->retries_left > 0) { | |
640 | ssif_inc_stat(ssif_info, receive_retries); | |
641 | ||
91620521 CM |
642 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
643 | ssif_info->waiting_alert = true; | |
644 | ssif_info->rtc_us_timer = SSIF_MSG_USEC; | |
0711e8c1 JG |
645 | if (!ssif_info->stopping) |
646 | mod_timer(&ssif_info->retry_timer, | |
647 | jiffies + SSIF_MSG_JIFFIES); | |
91620521 | 648 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
649 | return; |
650 | } | |
651 | ||
652 | ssif_inc_stat(ssif_info, receive_errors); | |
653 | ||
654 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
655 | dev_dbg(&ssif_info->client->dev, |
656 | "%s: Error %d\n", __func__, result); | |
25930707 CM |
657 | len = 0; |
658 | goto continue_op; | |
659 | } | |
660 | ||
661 | if ((len > 1) && (ssif_info->multi_pos == 0) | |
662 | && (data[0] == 0x00) && (data[1] == 0x01)) { | |
663 | /* Start of multi-part read. Start the next transaction. */ | |
664 | int i; | |
665 | ||
666 | ssif_inc_stat(ssif_info, received_message_parts); | |
667 | ||
668 | /* Remove the multi-part read marker. */ | |
25930707 | 669 | len -= 2; |
7d6380cd | 670 | data += 2; |
3d69d43b | 671 | for (i = 0; i < len; i++) |
7d6380cd | 672 | ssif_info->data[i] = data[i]; |
25930707 CM |
673 | ssif_info->multi_len = len; |
674 | ssif_info->multi_pos = 1; | |
675 | ||
676 | rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ, | |
677 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
678 | ssif_info->recv, I2C_SMBUS_BLOCK_DATA); | |
679 | if (rv < 0) { | |
680 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
681 | dev_dbg(&ssif_info->client->dev, |
682 | "Error from i2c_non_blocking_op(1)\n"); | |
25930707 CM |
683 | |
684 | result = -EIO; | |
685 | } else | |
686 | return; | |
687 | } else if (ssif_info->multi_pos) { | |
688 | /* Middle of multi-part read. Start the next transaction. */ | |
689 | int i; | |
690 | unsigned char blocknum; | |
691 | ||
692 | if (len == 0) { | |
693 | result = -EIO; | |
694 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
695 | dev_dbg(&ssif_info->client->dev, |
696 | "Middle message with no data\n"); | |
25930707 CM |
697 | |
698 | goto continue_op; | |
699 | } | |
700 | ||
3d69d43b | 701 | blocknum = data[0]; |
7d6380cd CM |
702 | len--; |
703 | data++; | |
704 | ||
705 | if (blocknum != 0xff && len != 31) { | |
706 | /* All blocks but the last must have 31 data bytes. */ | |
707 | result = -EIO; | |
708 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
709 | dev_dbg(&ssif_info->client->dev, |
710 | "Received middle message <31\n"); | |
25930707 | 711 | |
7d6380cd CM |
712 | goto continue_op; |
713 | } | |
714 | ||
715 | if (ssif_info->multi_len + len > IPMI_MAX_MSG_LENGTH) { | |
25930707 CM |
716 | /* Received message too big, abort the operation. */ |
717 | result = -E2BIG; | |
718 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
719 | dev_dbg(&ssif_info->client->dev, |
720 | "Received message too big\n"); | |
25930707 CM |
721 | |
722 | goto continue_op; | |
723 | } | |
724 | ||
3d69d43b | 725 | for (i = 0; i < len; i++) |
7d6380cd | 726 | ssif_info->data[i + ssif_info->multi_len] = data[i]; |
25930707 CM |
727 | ssif_info->multi_len += len; |
728 | if (blocknum == 0xff) { | |
729 | /* End of read */ | |
730 | len = ssif_info->multi_len; | |
731 | data = ssif_info->data; | |
55be8658 | 732 | } else if (blocknum + 1 != ssif_info->multi_pos) { |
25930707 CM |
733 | /* |
734 | * Out of sequence block, just abort. Block | |
735 | * numbers start at zero for the second block, | |
736 | * but multi_pos starts at one, so the +1. | |
737 | */ | |
55be8658 KP |
738 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) |
739 | dev_dbg(&ssif_info->client->dev, | |
740 | "Received message out of sequence, expected %u, got %u\n", | |
741 | ssif_info->multi_pos - 1, blocknum); | |
25930707 CM |
742 | result = -EIO; |
743 | } else { | |
744 | ssif_inc_stat(ssif_info, received_message_parts); | |
745 | ||
746 | ssif_info->multi_pos++; | |
747 | ||
748 | rv = ssif_i2c_send(ssif_info, msg_done_handler, | |
749 | I2C_SMBUS_READ, | |
750 | SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE, | |
751 | ssif_info->recv, | |
752 | I2C_SMBUS_BLOCK_DATA); | |
753 | if (rv < 0) { | |
754 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
755 | dev_dbg(&ssif_info->client->dev, |
756 | "Error from ssif_i2c_send\n"); | |
25930707 CM |
757 | |
758 | result = -EIO; | |
759 | } else | |
760 | return; | |
761 | } | |
762 | } | |
763 | ||
7d6380cd | 764 | continue_op: |
25930707 CM |
765 | if (result < 0) { |
766 | ssif_inc_stat(ssif_info, receive_errors); | |
767 | } else { | |
768 | ssif_inc_stat(ssif_info, received_messages); | |
769 | ssif_inc_stat(ssif_info, received_message_parts); | |
770 | } | |
771 | ||
25930707 | 772 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) |
83af4194 CM |
773 | dev_dbg(&ssif_info->client->dev, |
774 | "DONE 1: state = %d, result=%d\n", | |
25930707 CM |
775 | ssif_info->ssif_state, result); |
776 | ||
777 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
778 | msg = ssif_info->curr_msg; | |
779 | if (msg) { | |
6b8526d3 CM |
780 | if (data) { |
781 | if (len > IPMI_MAX_MSG_LENGTH) | |
782 | len = IPMI_MAX_MSG_LENGTH; | |
783 | memcpy(msg->rsp, data, len); | |
784 | } else { | |
785 | len = 0; | |
786 | } | |
25930707 | 787 | msg->rsp_size = len; |
25930707 CM |
788 | ssif_info->curr_msg = NULL; |
789 | } | |
790 | ||
791 | switch (ssif_info->ssif_state) { | |
792 | case SSIF_NORMAL: | |
793 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
794 | if (!msg) | |
795 | break; | |
796 | ||
797 | if (result < 0) | |
798 | return_hosed_msg(ssif_info, msg); | |
799 | else | |
800 | deliver_recv_msg(ssif_info, msg); | |
801 | break; | |
802 | ||
803 | case SSIF_GETTING_FLAGS: | |
804 | /* We got the flags from the SSIF, now handle them. */ | |
805 | if ((result < 0) || (len < 4) || (data[2] != 0)) { | |
806 | /* | |
807 | * Error fetching flags, or invalid length, | |
808 | * just give up for now. | |
809 | */ | |
810 | ssif_info->ssif_state = SSIF_NORMAL; | |
811 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
83af4194 CM |
812 | dev_warn(&ssif_info->client->dev, |
813 | "Error getting flags: %d %d, %x\n", | |
814 | result, len, (len >= 3) ? data[2] : 0); | |
25930707 CM |
815 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 |
816 | || data[1] != IPMI_GET_MSG_FLAGS_CMD) { | |
4495ec6d CM |
817 | /* |
818 | * Don't abort here, maybe it was a queued | |
819 | * response to a previous command. | |
820 | */ | |
821 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
83af4194 CM |
822 | dev_warn(&ssif_info->client->dev, |
823 | "Invalid response getting flags: %x %x\n", | |
824 | data[0], data[1]); | |
25930707 CM |
825 | } else { |
826 | ssif_inc_stat(ssif_info, flag_fetches); | |
827 | ssif_info->msg_flags = data[3]; | |
828 | handle_flags(ssif_info, flags); | |
829 | } | |
830 | break; | |
831 | ||
832 | case SSIF_CLEARING_FLAGS: | |
833 | /* We cleared the flags. */ | |
834 | if ((result < 0) || (len < 3) || (data[2] != 0)) { | |
835 | /* Error clearing flags */ | |
83af4194 CM |
836 | dev_warn(&ssif_info->client->dev, |
837 | "Error clearing flags: %d %d, %x\n", | |
838 | result, len, (len >= 3) ? data[2] : 0); | |
25930707 CM |
839 | } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 |
840 | || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) { | |
83af4194 CM |
841 | dev_warn(&ssif_info->client->dev, |
842 | "Invalid response clearing flags: %x %x\n", | |
843 | data[0], data[1]); | |
25930707 CM |
844 | } |
845 | ssif_info->ssif_state = SSIF_NORMAL; | |
846 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
847 | break; | |
848 | ||
849 | case SSIF_GETTING_EVENTS: | |
850 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { | |
851 | /* Error getting event, probably done. */ | |
852 | msg->done(msg); | |
853 | ||
854 | /* Take off the event flag. */ | |
855 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
856 | handle_flags(ssif_info, flags); | |
857 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
858 | || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) { | |
83af4194 CM |
859 | dev_warn(&ssif_info->client->dev, |
860 | "Invalid response getting events: %x %x\n", | |
861 | msg->rsp[0], msg->rsp[1]); | |
25930707 CM |
862 | msg->done(msg); |
863 | /* Take off the event flag. */ | |
864 | ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; | |
865 | handle_flags(ssif_info, flags); | |
866 | } else { | |
867 | handle_flags(ssif_info, flags); | |
868 | ssif_inc_stat(ssif_info, events); | |
869 | deliver_recv_msg(ssif_info, msg); | |
870 | } | |
871 | break; | |
872 | ||
873 | case SSIF_GETTING_MESSAGES: | |
874 | if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) { | |
875 | /* Error getting event, probably done. */ | |
876 | msg->done(msg); | |
877 | ||
878 | /* Take off the msg flag. */ | |
879 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
880 | handle_flags(ssif_info, flags); | |
881 | } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 | |
882 | || msg->rsp[1] != IPMI_GET_MSG_CMD) { | |
83af4194 CM |
883 | dev_warn(&ssif_info->client->dev, |
884 | "Invalid response clearing flags: %x %x\n", | |
885 | msg->rsp[0], msg->rsp[1]); | |
25930707 CM |
886 | msg->done(msg); |
887 | ||
888 | /* Take off the msg flag. */ | |
889 | ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL; | |
890 | handle_flags(ssif_info, flags); | |
891 | } else { | |
892 | ssif_inc_stat(ssif_info, incoming_messages); | |
893 | handle_flags(ssif_info, flags); | |
894 | deliver_recv_msg(ssif_info, msg); | |
895 | } | |
896 | break; | |
897 | } | |
898 | ||
899 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
900 | if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) { | |
901 | if (ssif_info->req_events) | |
902 | start_event_fetch(ssif_info, flags); | |
903 | else if (ssif_info->req_flags) | |
904 | start_flag_fetch(ssif_info, flags); | |
905 | else | |
906 | start_next_msg(ssif_info, flags); | |
907 | } else | |
908 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
909 | ||
910 | if (ssif_info->ssif_debug & SSIF_DEBUG_STATE) | |
83af4194 CM |
911 | dev_dbg(&ssif_info->client->dev, |
912 | "DONE 2: state = %d.\n", ssif_info->ssif_state); | |
25930707 CM |
913 | } |
914 | ||
915 | static void msg_written_handler(struct ssif_info *ssif_info, int result, | |
916 | unsigned char *data, unsigned int len) | |
917 | { | |
918 | int rv; | |
919 | ||
920 | /* We are single-threaded here, so no need for a lock. */ | |
921 | if (result < 0) { | |
922 | ssif_info->retries_left--; | |
923 | if (ssif_info->retries_left > 0) { | |
924 | if (!start_resend(ssif_info)) { | |
925 | ssif_inc_stat(ssif_info, send_retries); | |
926 | return; | |
927 | } | |
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) | |
83af4194 CM |
932 | dev_dbg(&ssif_info->client->dev, |
933 | "%s: Out of retries\n", __func__); | |
25930707 CM |
934 | msg_done_handler(ssif_info, -EIO, NULL, 0); |
935 | return; | |
936 | } | |
937 | ||
938 | ssif_inc_stat(ssif_info, send_errors); | |
939 | ||
940 | /* | |
941 | * Got an error on transmit, let the done routine | |
942 | * handle it. | |
943 | */ | |
944 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
945 | dev_dbg(&ssif_info->client->dev, |
946 | "%s: Error %d\n", __func__, result); | |
25930707 CM |
947 | |
948 | msg_done_handler(ssif_info, result, NULL, 0); | |
949 | return; | |
950 | } | |
951 | ||
952 | if (ssif_info->multi_data) { | |
3d69d43b CM |
953 | /* |
954 | * In the middle of a multi-data write. See the comment | |
955 | * in the SSIF_MULTI_n_PART case in the probe function | |
956 | * for details on the intricacies of this. | |
957 | */ | |
10042504 | 958 | int left, to_write; |
6de65fcf | 959 | unsigned char *data_to_send; |
10042504 | 960 | unsigned char cmd; |
25930707 CM |
961 | |
962 | ssif_inc_stat(ssif_info, sent_messages_parts); | |
963 | ||
964 | left = ssif_info->multi_len - ssif_info->multi_pos; | |
10042504 CM |
965 | to_write = left; |
966 | if (to_write > 32) | |
967 | to_write = 32; | |
25930707 | 968 | /* Length byte. */ |
10042504 | 969 | ssif_info->multi_data[ssif_info->multi_pos] = to_write; |
6de65fcf | 970 | data_to_send = ssif_info->multi_data + ssif_info->multi_pos; |
10042504 CM |
971 | ssif_info->multi_pos += to_write; |
972 | cmd = SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE; | |
973 | if (ssif_info->cmd8_works) { | |
974 | if (left == to_write) { | |
975 | cmd = SSIF_IPMI_MULTI_PART_REQUEST_END; | |
976 | ssif_info->multi_data = NULL; | |
977 | } | |
978 | } else if (to_write < 32) { | |
25930707 | 979 | ssif_info->multi_data = NULL; |
10042504 | 980 | } |
25930707 CM |
981 | |
982 | rv = ssif_i2c_send(ssif_info, msg_written_handler, | |
10042504 CM |
983 | I2C_SMBUS_WRITE, cmd, |
984 | data_to_send, I2C_SMBUS_BLOCK_DATA); | |
25930707 CM |
985 | if (rv < 0) { |
986 | /* request failed, just return the error. */ | |
987 | ssif_inc_stat(ssif_info, send_errors); | |
988 | ||
989 | if (ssif_info->ssif_debug & SSIF_DEBUG_MSG) | |
83af4194 CM |
990 | dev_dbg(&ssif_info->client->dev, |
991 | "Error from i2c_non_blocking_op(3)\n"); | |
25930707 CM |
992 | msg_done_handler(ssif_info, -EIO, NULL, 0); |
993 | } | |
994 | } else { | |
21c8f915 | 995 | /* Ready to request the result. */ |
91620521 | 996 | unsigned long oflags, *flags; |
91620521 | 997 | |
25930707 CM |
998 | ssif_inc_stat(ssif_info, sent_messages); |
999 | ssif_inc_stat(ssif_info, sent_messages_parts); | |
1000 | ||
91620521 | 1001 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
21c8f915 CM |
1002 | if (ssif_info->got_alert) { |
1003 | /* The result is already ready, just start it. */ | |
91620521 | 1004 | ssif_info->got_alert = false; |
91620521 | 1005 | ipmi_ssif_unlock_cond(ssif_info, flags); |
21c8f915 | 1006 | start_get(ssif_info); |
91620521 CM |
1007 | } else { |
1008 | /* Wait a jiffie then request the next message */ | |
1009 | ssif_info->waiting_alert = true; | |
1010 | ssif_info->retries_left = SSIF_RECV_RETRIES; | |
1011 | ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC; | |
0711e8c1 JG |
1012 | if (!ssif_info->stopping) |
1013 | mod_timer(&ssif_info->retry_timer, | |
1014 | jiffies + SSIF_MSG_PART_JIFFIES); | |
91620521 CM |
1015 | ipmi_ssif_unlock_cond(ssif_info, flags); |
1016 | } | |
25930707 CM |
1017 | } |
1018 | } | |
1019 | ||
1020 | static int start_resend(struct ssif_info *ssif_info) | |
1021 | { | |
1022 | int rv; | |
1023 | int command; | |
1024 | ||
91620521 CM |
1025 | ssif_info->got_alert = false; |
1026 | ||
25930707 CM |
1027 | if (ssif_info->data_len > 32) { |
1028 | command = SSIF_IPMI_MULTI_PART_REQUEST_START; | |
1029 | ssif_info->multi_data = ssif_info->data; | |
1030 | ssif_info->multi_len = ssif_info->data_len; | |
1031 | /* | |
1032 | * Subtle thing, this is 32, not 33, because we will | |
1033 | * overwrite the thing at position 32 (which was just | |
1034 | * transmitted) with the new length. | |
1035 | */ | |
1036 | ssif_info->multi_pos = 32; | |
1037 | ssif_info->data[0] = 32; | |
1038 | } else { | |
1039 | ssif_info->multi_data = NULL; | |
1040 | command = SSIF_IPMI_REQUEST; | |
1041 | ssif_info->data[0] = ssif_info->data_len; | |
1042 | } | |
1043 | ||
1044 | rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE, | |
1045 | command, ssif_info->data, I2C_SMBUS_BLOCK_DATA); | |
1046 | if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG)) | |
83af4194 CM |
1047 | dev_dbg(&ssif_info->client->dev, |
1048 | "Error from i2c_non_blocking_op(4)\n"); | |
25930707 CM |
1049 | return rv; |
1050 | } | |
1051 | ||
1052 | static int start_send(struct ssif_info *ssif_info, | |
1053 | unsigned char *data, | |
1054 | unsigned int len) | |
1055 | { | |
1056 | if (len > IPMI_MAX_MSG_LENGTH) | |
1057 | return -E2BIG; | |
1058 | if (len > ssif_info->max_xmit_msg_size) | |
1059 | return -E2BIG; | |
1060 | ||
1061 | ssif_info->retries_left = SSIF_SEND_RETRIES; | |
3d69d43b | 1062 | memcpy(ssif_info->data + 1, data, len); |
25930707 CM |
1063 | ssif_info->data_len = len; |
1064 | return start_resend(ssif_info); | |
1065 | } | |
1066 | ||
1067 | /* Must be called with the message lock held. */ | |
1068 | static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags) | |
1069 | { | |
1070 | struct ipmi_smi_msg *msg; | |
1071 | unsigned long oflags; | |
1072 | ||
1073 | restart: | |
1074 | if (!SSIF_IDLE(ssif_info)) { | |
1075 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1076 | return; | |
1077 | } | |
1078 | ||
1079 | if (!ssif_info->waiting_msg) { | |
1080 | ssif_info->curr_msg = NULL; | |
1081 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1082 | } else { | |
1083 | int rv; | |
1084 | ||
1085 | ssif_info->curr_msg = ssif_info->waiting_msg; | |
1086 | ssif_info->waiting_msg = NULL; | |
1087 | ipmi_ssif_unlock_cond(ssif_info, flags); | |
1088 | rv = start_send(ssif_info, | |
1089 | ssif_info->curr_msg->data, | |
1090 | ssif_info->curr_msg->data_size); | |
1091 | if (rv) { | |
1092 | msg = ssif_info->curr_msg; | |
1093 | ssif_info->curr_msg = NULL; | |
1094 | return_hosed_msg(ssif_info, msg); | |
1095 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1096 | goto restart; | |
1097 | } | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | static void sender(void *send_info, | |
1102 | struct ipmi_smi_msg *msg) | |
1103 | { | |
1104 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
1105 | unsigned long oflags, *flags; | |
1106 | ||
1107 | BUG_ON(ssif_info->waiting_msg); | |
1108 | ssif_info->waiting_msg = msg; | |
1109 | ||
1110 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
1111 | start_next_msg(ssif_info, flags); | |
1112 | ||
1113 | if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) { | |
526290aa | 1114 | struct timespec64 t; |
25930707 | 1115 | |
526290aa | 1116 | ktime_get_real_ts64(&t); |
83af4194 CM |
1117 | dev_dbg(&ssif_info->client->dev, |
1118 | "**Enqueue %02x %02x: %lld.%6.6ld\n", | |
25880f7d JP |
1119 | msg->data[0], msg->data[1], |
1120 | (long long)t.tv_sec, (long)t.tv_nsec / NSEC_PER_USEC); | |
25930707 CM |
1121 | } |
1122 | } | |
1123 | ||
1124 | static int get_smi_info(void *send_info, struct ipmi_smi_info *data) | |
1125 | { | |
1126 | struct ssif_info *ssif_info = send_info; | |
1127 | ||
1128 | data->addr_src = ssif_info->addr_source; | |
1129 | data->dev = &ssif_info->client->dev; | |
1130 | data->addr_info = ssif_info->addr_info; | |
1131 | get_device(data->dev); | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | /* | |
a1466ec5 | 1137 | * Upper layer wants us to request events. |
25930707 CM |
1138 | */ |
1139 | static void request_events(void *send_info) | |
1140 | { | |
1141 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
1142 | unsigned long oflags, *flags; | |
1143 | ||
1144 | if (!ssif_info->has_event_buffer) | |
1145 | return; | |
1146 | ||
1147 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
25930707 | 1148 | ssif_info->req_events = true; |
a1466ec5 CM |
1149 | ipmi_ssif_unlock_cond(ssif_info, flags); |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * Upper layer is changing the flag saying whether we need to request | |
1154 | * flags periodically or not. | |
1155 | */ | |
c65ea996 | 1156 | static void ssif_set_need_watch(void *send_info, unsigned int watch_mask) |
a1466ec5 CM |
1157 | { |
1158 | struct ssif_info *ssif_info = (struct ssif_info *) send_info; | |
1159 | unsigned long oflags, *flags; | |
c65ea996 CM |
1160 | long timeout = 0; |
1161 | ||
1162 | if (watch_mask & IPMI_WATCH_MASK_CHECK_MESSAGES) | |
1163 | timeout = SSIF_WATCH_MSG_TIMEOUT; | |
e1891cff | 1164 | else if (watch_mask) |
c65ea996 | 1165 | timeout = SSIF_WATCH_WATCHDOG_TIMEOUT; |
a1466ec5 CM |
1166 | |
1167 | flags = ipmi_ssif_lock_cond(ssif_info, &oflags); | |
c65ea996 CM |
1168 | if (timeout != ssif_info->watch_timeout) { |
1169 | ssif_info->watch_timeout = timeout; | |
1170 | if (ssif_info->watch_timeout) | |
a1466ec5 | 1171 | mod_timer(&ssif_info->watch_timer, |
c65ea996 | 1172 | jiffies + ssif_info->watch_timeout); |
25930707 | 1173 | } |
a1466ec5 | 1174 | ipmi_ssif_unlock_cond(ssif_info, flags); |
25930707 CM |
1175 | } |
1176 | ||
a567b623 CM |
1177 | static int ssif_start_processing(void *send_info, |
1178 | struct ipmi_smi *intf) | |
25930707 CM |
1179 | { |
1180 | struct ssif_info *ssif_info = send_info; | |
1181 | ||
1182 | ssif_info->intf = intf; | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | #define MAX_SSIF_BMCS 4 | |
1188 | ||
1189 | static unsigned short addr[MAX_SSIF_BMCS]; | |
1190 | static int num_addrs; | |
1191 | module_param_array(addr, ushort, &num_addrs, 0); | |
1192 | MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs."); | |
1193 | ||
1194 | static char *adapter_name[MAX_SSIF_BMCS]; | |
1195 | static int num_adapter_names; | |
1196 | module_param_array(adapter_name, charp, &num_adapter_names, 0); | |
1197 | MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned."); | |
1198 | ||
1199 | static int slave_addrs[MAX_SSIF_BMCS]; | |
1200 | static int num_slave_addrs; | |
1201 | module_param_array(slave_addrs, int, &num_slave_addrs, 0); | |
1202 | MODULE_PARM_DESC(slave_addrs, | |
1203 | "The default IPMB slave address for the controller."); | |
1204 | ||
bf2d0877 CM |
1205 | static bool alerts_broken; |
1206 | module_param(alerts_broken, bool, 0); | |
1207 | MODULE_PARM_DESC(alerts_broken, "Don't enable alerts for the controller."); | |
1208 | ||
25930707 CM |
1209 | /* |
1210 | * Bit 0 enables message debugging, bit 1 enables state debugging, and | |
1211 | * bit 2 enables timing debugging. This is an array indexed by | |
1212 | * interface number" | |
1213 | */ | |
1214 | static int dbg[MAX_SSIF_BMCS]; | |
1215 | static int num_dbg; | |
1216 | module_param_array(dbg, int, &num_dbg, 0); | |
1217 | MODULE_PARM_DESC(dbg, "Turn on debugging."); | |
1218 | ||
1219 | static bool ssif_dbg_probe; | |
1220 | module_param_named(dbg_probe, ssif_dbg_probe, bool, 0); | |
1221 | MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters."); | |
1222 | ||
fedb25ea | 1223 | static bool ssif_tryacpi = true; |
25930707 CM |
1224 | module_param_named(tryacpi, ssif_tryacpi, bool, 0); |
1225 | MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI"); | |
1226 | ||
fedb25ea | 1227 | static bool ssif_trydmi = true; |
25930707 CM |
1228 | module_param_named(trydmi, ssif_trydmi, bool, 0); |
1229 | MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)"); | |
1230 | ||
1231 | static DEFINE_MUTEX(ssif_infos_mutex); | |
1232 | static LIST_HEAD(ssif_infos); | |
1233 | ||
ac2673d5 CM |
1234 | #define IPMI_SSIF_ATTR(name) \ |
1235 | static ssize_t ipmi_##name##_show(struct device *dev, \ | |
1236 | struct device_attribute *attr, \ | |
1237 | char *buf) \ | |
1238 | { \ | |
1239 | struct ssif_info *ssif_info = dev_get_drvdata(dev); \ | |
1240 | \ | |
1241 | return snprintf(buf, 10, "%u\n", ssif_get_stat(ssif_info, name));\ | |
1242 | } \ | |
1243 | static DEVICE_ATTR(name, S_IRUGO, ipmi_##name##_show, NULL) | |
1244 | ||
1245 | static ssize_t ipmi_type_show(struct device *dev, | |
1246 | struct device_attribute *attr, | |
1247 | char *buf) | |
1248 | { | |
1249 | return snprintf(buf, 10, "ssif\n"); | |
1250 | } | |
1251 | static DEVICE_ATTR(type, S_IRUGO, ipmi_type_show, NULL); | |
1252 | ||
1253 | IPMI_SSIF_ATTR(sent_messages); | |
1254 | IPMI_SSIF_ATTR(sent_messages_parts); | |
1255 | IPMI_SSIF_ATTR(send_retries); | |
1256 | IPMI_SSIF_ATTR(send_errors); | |
1257 | IPMI_SSIF_ATTR(received_messages); | |
1258 | IPMI_SSIF_ATTR(received_message_parts); | |
1259 | IPMI_SSIF_ATTR(receive_retries); | |
1260 | IPMI_SSIF_ATTR(receive_errors); | |
1261 | IPMI_SSIF_ATTR(flag_fetches); | |
1262 | IPMI_SSIF_ATTR(hosed); | |
1263 | IPMI_SSIF_ATTR(events); | |
1264 | IPMI_SSIF_ATTR(watchdog_pretimeouts); | |
1265 | IPMI_SSIF_ATTR(alerts); | |
1266 | ||
1267 | static struct attribute *ipmi_ssif_dev_attrs[] = { | |
1268 | &dev_attr_type.attr, | |
1269 | &dev_attr_sent_messages.attr, | |
1270 | &dev_attr_sent_messages_parts.attr, | |
1271 | &dev_attr_send_retries.attr, | |
1272 | &dev_attr_send_errors.attr, | |
1273 | &dev_attr_received_messages.attr, | |
1274 | &dev_attr_received_message_parts.attr, | |
1275 | &dev_attr_receive_retries.attr, | |
1276 | &dev_attr_receive_errors.attr, | |
1277 | &dev_attr_flag_fetches.attr, | |
1278 | &dev_attr_hosed.attr, | |
1279 | &dev_attr_events.attr, | |
1280 | &dev_attr_watchdog_pretimeouts.attr, | |
1281 | &dev_attr_alerts.attr, | |
1282 | NULL | |
1283 | }; | |
1284 | ||
1285 | static const struct attribute_group ipmi_ssif_dev_attr_group = { | |
1286 | .attrs = ipmi_ssif_dev_attrs, | |
1287 | }; | |
1288 | ||
a313dec6 | 1289 | static void shutdown_ssif(void *send_info) |
25930707 | 1290 | { |
a313dec6 | 1291 | struct ssif_info *ssif_info = send_info; |
25930707 | 1292 | |
ac2673d5 CM |
1293 | device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group); |
1294 | dev_set_drvdata(&ssif_info->client->dev, NULL); | |
1295 | ||
25930707 CM |
1296 | /* make sure the driver is not looking for flags any more. */ |
1297 | while (ssif_info->ssif_state != SSIF_NORMAL) | |
1298 | schedule_timeout(1); | |
1299 | ||
1300 | ssif_info->stopping = true; | |
a1466ec5 | 1301 | del_timer_sync(&ssif_info->watch_timer); |
25930707 CM |
1302 | del_timer_sync(&ssif_info->retry_timer); |
1303 | if (ssif_info->thread) { | |
1304 | complete(&ssif_info->wake_thread); | |
1305 | kthread_stop(ssif_info->thread); | |
1306 | } | |
a313dec6 CM |
1307 | } |
1308 | ||
1309 | static int ssif_remove(struct i2c_client *client) | |
1310 | { | |
1311 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
a313dec6 | 1312 | struct ssif_addr_info *addr_info; |
a313dec6 CM |
1313 | |
1314 | if (!ssif_info) | |
1315 | return 0; | |
1316 | ||
1317 | /* | |
1318 | * After this point, we won't deliver anything asychronously | |
1319 | * to the message handler. We can unregister ourself. | |
1320 | */ | |
2512e40e | 1321 | ipmi_unregister_smi(ssif_info->intf); |
a313dec6 | 1322 | |
0944d889 CM |
1323 | list_for_each_entry(addr_info, &ssif_infos, link) { |
1324 | if (addr_info->client == client) { | |
1325 | addr_info->client = NULL; | |
1326 | break; | |
1327 | } | |
1328 | } | |
1329 | ||
2512e40e CM |
1330 | kfree(ssif_info); |
1331 | ||
12112293 | 1332 | return 0; |
25930707 CM |
1333 | } |
1334 | ||
10042504 CM |
1335 | static int read_response(struct i2c_client *client, unsigned char *resp) |
1336 | { | |
1337 | int ret = -ENODEV, retry_cnt = SSIF_RECV_RETRIES; | |
1338 | ||
1339 | while (retry_cnt > 0) { | |
1340 | ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE, | |
1341 | resp); | |
1342 | if (ret > 0) | |
1343 | break; | |
1344 | msleep(SSIF_MSG_MSEC); | |
1345 | retry_cnt--; | |
1346 | if (retry_cnt <= 0) | |
1347 | break; | |
1348 | } | |
1349 | ||
1350 | return ret; | |
1351 | } | |
1352 | ||
25930707 CM |
1353 | static int do_cmd(struct i2c_client *client, int len, unsigned char *msg, |
1354 | int *resp_len, unsigned char *resp) | |
1355 | { | |
1356 | int retry_cnt; | |
1357 | int ret; | |
1358 | ||
1359 | retry_cnt = SSIF_SEND_RETRIES; | |
1360 | retry1: | |
1361 | ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg); | |
1362 | if (ret) { | |
1363 | retry_cnt--; | |
1364 | if (retry_cnt > 0) | |
1365 | goto retry1; | |
1366 | return -ENODEV; | |
1367 | } | |
1368 | ||
10042504 | 1369 | ret = read_response(client, resp); |
25930707 CM |
1370 | if (ret > 0) { |
1371 | /* Validate that the response is correct. */ | |
1372 | if (ret < 3 || | |
1373 | (resp[0] != (msg[0] | (1 << 2))) || | |
1374 | (resp[1] != msg[1])) | |
1375 | ret = -EINVAL; | |
10042504 CM |
1376 | else if (ret > IPMI_MAX_MSG_LENGTH) { |
1377 | ret = -E2BIG; | |
1378 | } else { | |
25930707 CM |
1379 | *resp_len = ret; |
1380 | ret = 0; | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | return ret; | |
1385 | } | |
1386 | ||
1387 | static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info) | |
1388 | { | |
1389 | unsigned char *resp; | |
1390 | unsigned char msg[3]; | |
1391 | int rv; | |
1392 | int len; | |
1393 | ||
1394 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
1395 | if (!resp) | |
1396 | return -ENOMEM; | |
1397 | ||
1398 | /* Do a Get Device ID command, since it is required. */ | |
1399 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1400 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1401 | rv = do_cmd(client, 2, msg, &len, resp); | |
1402 | if (rv) | |
1403 | rv = -ENODEV; | |
1404 | else | |
1405 | strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE); | |
1406 | kfree(resp); | |
1407 | return rv; | |
1408 | } | |
1409 | ||
b0e9aaa9 CM |
1410 | static int strcmp_nospace(char *s1, char *s2) |
1411 | { | |
1412 | while (*s1 && *s2) { | |
1413 | while (isspace(*s1)) | |
1414 | s1++; | |
1415 | while (isspace(*s2)) | |
1416 | s2++; | |
1417 | if (*s1 > *s2) | |
1418 | return 1; | |
1419 | if (*s1 < *s2) | |
1420 | return -1; | |
1421 | s1++; | |
1422 | s2++; | |
1423 | } | |
1424 | return 0; | |
1425 | } | |
1426 | ||
25930707 CM |
1427 | static struct ssif_addr_info *ssif_info_find(unsigned short addr, |
1428 | char *adapter_name, | |
1429 | bool match_null_name) | |
1430 | { | |
1431 | struct ssif_addr_info *info, *found = NULL; | |
1432 | ||
1433 | restart: | |
1434 | list_for_each_entry(info, &ssif_infos, link) { | |
1435 | if (info->binfo.addr == addr) { | |
c4436c91 KP |
1436 | if (info->addr_src == SI_SMBIOS) |
1437 | info->adapter_name = kstrdup(adapter_name, | |
1438 | GFP_KERNEL); | |
1439 | ||
25930707 CM |
1440 | if (info->adapter_name || adapter_name) { |
1441 | if (!info->adapter_name != !adapter_name) { | |
1442 | /* One is NULL and one is not */ | |
1443 | continue; | |
1444 | } | |
b0e9aaa9 CM |
1445 | if (adapter_name && |
1446 | strcmp_nospace(info->adapter_name, | |
1447 | adapter_name)) | |
1448 | /* Names do not match */ | |
25930707 CM |
1449 | continue; |
1450 | } | |
1451 | found = info; | |
1452 | break; | |
1453 | } | |
1454 | } | |
1455 | ||
1456 | if (!found && match_null_name) { | |
1457 | /* Try to get an exact match first, then try with a NULL name */ | |
1458 | adapter_name = NULL; | |
1459 | match_null_name = false; | |
1460 | goto restart; | |
1461 | } | |
1462 | ||
1463 | return found; | |
1464 | } | |
1465 | ||
1466 | static bool check_acpi(struct ssif_info *ssif_info, struct device *dev) | |
1467 | { | |
1468 | #ifdef CONFIG_ACPI | |
1469 | acpi_handle acpi_handle; | |
1470 | ||
1471 | acpi_handle = ACPI_HANDLE(dev); | |
1472 | if (acpi_handle) { | |
1473 | ssif_info->addr_source = SI_ACPI; | |
1474 | ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle; | |
1475 | return true; | |
1476 | } | |
1477 | #endif | |
1478 | return false; | |
1479 | } | |
1480 | ||
94671710 CM |
1481 | static int find_slave_address(struct i2c_client *client, int slave_addr) |
1482 | { | |
0944d889 CM |
1483 | #ifdef CONFIG_IPMI_DMI_DECODE |
1484 | if (!slave_addr) | |
1485 | slave_addr = ipmi_dmi_get_slave_addr( | |
95e300c0 | 1486 | SI_TYPE_INVALID, |
0944d889 CM |
1487 | i2c_adapter_id(client->adapter), |
1488 | client->addr); | |
1489 | #endif | |
94671710 CM |
1490 | |
1491 | return slave_addr; | |
1492 | } | |
1493 | ||
10042504 CM |
1494 | static int start_multipart_test(struct i2c_client *client, |
1495 | unsigned char *msg, bool do_middle) | |
1496 | { | |
1497 | int retry_cnt = SSIF_SEND_RETRIES, ret; | |
1498 | ||
1499 | retry_write: | |
1500 | ret = i2c_smbus_write_block_data(client, | |
1501 | SSIF_IPMI_MULTI_PART_REQUEST_START, | |
1502 | 32, msg); | |
1503 | if (ret) { | |
1504 | retry_cnt--; | |
1505 | if (retry_cnt > 0) | |
1506 | goto retry_write; | |
1507 | 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"); | |
1508 | return ret; | |
1509 | } | |
1510 | ||
1511 | if (!do_middle) | |
1512 | return 0; | |
1513 | ||
1514 | ret = i2c_smbus_write_block_data(client, | |
1515 | SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, | |
1516 | 32, msg + 32); | |
1517 | if (ret) { | |
1518 | 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"); | |
1519 | return ret; | |
1520 | } | |
1521 | ||
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static void test_multipart_messages(struct i2c_client *client, | |
1526 | struct ssif_info *ssif_info, | |
1527 | unsigned char *resp) | |
1528 | { | |
1529 | unsigned char msg[65]; | |
1530 | int ret; | |
1531 | bool do_middle; | |
1532 | ||
1533 | if (ssif_info->max_xmit_msg_size <= 32) | |
1534 | return; | |
1535 | ||
1536 | do_middle = ssif_info->max_xmit_msg_size > 63; | |
1537 | ||
1538 | memset(msg, 0, sizeof(msg)); | |
1539 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1540 | msg[1] = IPMI_GET_DEVICE_ID_CMD; | |
1541 | ||
1542 | /* | |
1543 | * The specification is all messed up dealing with sending | |
1544 | * multi-part messages. Per what the specification says, it | |
1545 | * is impossible to send a message that is a multiple of 32 | |
1546 | * bytes, except for 32 itself. It talks about a "start" | |
1547 | * transaction (cmd=6) that must be 32 bytes, "middle" | |
1548 | * transaction (cmd=7) that must be 32 bytes, and an "end" | |
1549 | * transaction. The "end" transaction is shown as cmd=7 in | |
1550 | * the text, but if that's the case there is no way to | |
1551 | * differentiate between a middle and end part except the | |
1552 | * length being less than 32. But there is a table at the far | |
1553 | * end of the section (that I had never noticed until someone | |
1554 | * pointed it out to me) that mentions it as cmd=8. | |
1555 | * | |
1556 | * After some thought, I think the example is wrong and the | |
1557 | * end transaction should be cmd=8. But some systems don't | |
1558 | * implement cmd=8, they use a zero-length end transaction, | |
1559 | * even though that violates the SMBus specification. | |
1560 | * | |
1561 | * So, to work around this, this code tests if cmd=8 works. | |
1562 | * If it does, then we use that. If not, it tests zero- | |
1563 | * byte end transactions. If that works, good. If not, | |
1564 | * we only allow 63-byte transactions max. | |
1565 | */ | |
1566 | ||
1567 | ret = start_multipart_test(client, msg, do_middle); | |
1568 | if (ret) | |
1569 | goto out_no_multi_part; | |
1570 | ||
1571 | ret = i2c_smbus_write_block_data(client, | |
1572 | SSIF_IPMI_MULTI_PART_REQUEST_END, | |
1573 | 1, msg + 64); | |
1574 | ||
1575 | if (!ret) | |
1576 | ret = read_response(client, resp); | |
1577 | ||
1578 | if (ret > 0) { | |
1579 | /* End transactions work, we are good. */ | |
1580 | ssif_info->cmd8_works = true; | |
1581 | return; | |
1582 | } | |
1583 | ||
1584 | ret = start_multipart_test(client, msg, do_middle); | |
1585 | if (ret) { | |
1586 | dev_err(&client->dev, "Second multipart test failed.\n"); | |
1587 | goto out_no_multi_part; | |
1588 | } | |
1589 | ||
1590 | ret = i2c_smbus_write_block_data(client, | |
1591 | SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE, | |
1592 | 0, msg + 64); | |
1593 | if (!ret) | |
1594 | ret = read_response(client, resp); | |
1595 | if (ret > 0) | |
1596 | /* Zero-size end parts work, use those. */ | |
1597 | return; | |
1598 | ||
1599 | /* Limit to 63 bytes and use a short middle command to mark the end. */ | |
1600 | if (ssif_info->max_xmit_msg_size > 63) | |
1601 | ssif_info->max_xmit_msg_size = 63; | |
1602 | return; | |
1603 | ||
1604 | out_no_multi_part: | |
1605 | ssif_info->max_xmit_msg_size = 32; | |
1606 | return; | |
1607 | } | |
1608 | ||
91620521 CM |
1609 | /* |
1610 | * Global enables we care about. | |
1611 | */ | |
1612 | #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ | |
1613 | IPMI_BMC_EVT_MSG_INTR) | |
1614 | ||
c4436c91 KP |
1615 | static void ssif_remove_dup(struct i2c_client *client) |
1616 | { | |
1617 | struct ssif_info *ssif_info = i2c_get_clientdata(client); | |
1618 | ||
1619 | ipmi_unregister_smi(ssif_info->intf); | |
1620 | kfree(ssif_info); | |
1621 | } | |
1622 | ||
1623 | static int ssif_add_infos(struct i2c_client *client) | |
1624 | { | |
1625 | struct ssif_addr_info *info; | |
1626 | ||
1627 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
1628 | if (!info) | |
1629 | return -ENOMEM; | |
1630 | info->addr_src = SI_ACPI; | |
1631 | info->client = client; | |
1632 | info->adapter_name = kstrdup(client->adapter->name, GFP_KERNEL); | |
1633 | info->binfo.addr = client->addr; | |
1634 | list_add_tail(&info->link, &ssif_infos); | |
1635 | return 0; | |
1636 | } | |
1637 | ||
1638 | /* | |
1639 | * Prefer ACPI over SMBIOS, if both are available. | |
1640 | * So if we get an ACPI interface and have already registered a SMBIOS | |
1641 | * interface at the same address, remove the SMBIOS and add the ACPI one. | |
1642 | */ | |
1643 | static int ssif_check_and_remove(struct i2c_client *client, | |
1644 | struct ssif_info *ssif_info) | |
1645 | { | |
1646 | struct ssif_addr_info *info; | |
1647 | ||
1648 | list_for_each_entry(info, &ssif_infos, link) { | |
1649 | if (!info->client) | |
1650 | return 0; | |
1651 | if (!strcmp(info->adapter_name, client->adapter->name) && | |
1652 | info->binfo.addr == client->addr) { | |
1653 | if (info->addr_src == SI_ACPI) | |
1654 | return -EEXIST; | |
1655 | ||
1656 | if (ssif_info->addr_source == SI_ACPI && | |
1657 | info->addr_src == SI_SMBIOS) { | |
1658 | dev_info(&client->dev, | |
1659 | "Removing %s-specified SSIF interface in favor of ACPI\n", | |
1660 | ipmi_addr_src_to_str(info->addr_src)); | |
1661 | ssif_remove_dup(info->client); | |
1662 | return 0; | |
1663 | } | |
1664 | } | |
1665 | } | |
1666 | return 0; | |
1667 | } | |
1668 | ||
25930707 CM |
1669 | static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id) |
1670 | { | |
1671 | unsigned char msg[3]; | |
1672 | unsigned char *resp; | |
1673 | struct ssif_info *ssif_info; | |
1674 | int rv = 0; | |
1675 | int len; | |
1676 | int i; | |
1677 | u8 slave_addr = 0; | |
1678 | struct ssif_addr_info *addr_info = NULL; | |
1679 | ||
c4436c91 | 1680 | mutex_lock(&ssif_infos_mutex); |
25930707 | 1681 | resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
c4436c91 KP |
1682 | if (!resp) { |
1683 | mutex_unlock(&ssif_infos_mutex); | |
25930707 | 1684 | return -ENOMEM; |
c4436c91 | 1685 | } |
25930707 CM |
1686 | |
1687 | ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL); | |
1688 | if (!ssif_info) { | |
1689 | kfree(resp); | |
c4436c91 | 1690 | mutex_unlock(&ssif_infos_mutex); |
25930707 CM |
1691 | return -ENOMEM; |
1692 | } | |
1693 | ||
1694 | if (!check_acpi(ssif_info, &client->dev)) { | |
1695 | addr_info = ssif_info_find(client->addr, client->adapter->name, | |
1696 | true); | |
1697 | if (!addr_info) { | |
1698 | /* Must have come in through sysfs. */ | |
1699 | ssif_info->addr_source = SI_HOTMOD; | |
1700 | } else { | |
1701 | ssif_info->addr_source = addr_info->addr_src; | |
1702 | ssif_info->ssif_debug = addr_info->debug; | |
1703 | ssif_info->addr_info = addr_info->addr_info; | |
0944d889 | 1704 | addr_info->client = client; |
25930707 CM |
1705 | slave_addr = addr_info->slave_addr; |
1706 | } | |
1707 | } | |
1708 | ||
c4436c91 KP |
1709 | rv = ssif_check_and_remove(client, ssif_info); |
1710 | /* If rv is 0 and addr source is not SI_ACPI, continue probing */ | |
1711 | if (!rv && ssif_info->addr_source == SI_ACPI) { | |
1712 | rv = ssif_add_infos(client); | |
1713 | if (rv) { | |
1714 | dev_err(&client->dev, "Out of memory!, exiting ..\n"); | |
1715 | goto out; | |
1716 | } | |
1717 | } else if (rv) { | |
1718 | dev_err(&client->dev, "Not probing, Interface already present\n"); | |
1719 | goto out; | |
1720 | } | |
1721 | ||
94671710 CM |
1722 | slave_addr = find_slave_address(client, slave_addr); |
1723 | ||
83af4194 CM |
1724 | dev_info(&client->dev, |
1725 | "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n", | |
25880f7d JP |
1726 | ipmi_addr_src_to_str(ssif_info->addr_source), |
1727 | client->addr, client->adapter->name, slave_addr); | |
25930707 | 1728 | |
25930707 CM |
1729 | ssif_info->client = client; |
1730 | i2c_set_clientdata(client, ssif_info); | |
1731 | ||
1732 | /* Now check for system interface capabilities */ | |
1733 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1734 | msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD; | |
1735 | msg[2] = 0; /* SSIF */ | |
1736 | rv = do_cmd(client, 3, msg, &len, resp); | |
1737 | if (!rv && (len >= 3) && (resp[2] == 0)) { | |
1738 | if (len < 7) { | |
1739 | if (ssif_dbg_probe) | |
83af4194 CM |
1740 | dev_dbg(&ssif_info->client->dev, |
1741 | "SSIF info too short: %d\n", len); | |
25930707 CM |
1742 | goto no_support; |
1743 | } | |
1744 | ||
1745 | /* Got a good SSIF response, handle it. */ | |
1746 | ssif_info->max_xmit_msg_size = resp[5]; | |
1747 | ssif_info->max_recv_msg_size = resp[6]; | |
1748 | ssif_info->multi_support = (resp[4] >> 6) & 0x3; | |
1749 | ssif_info->supports_pec = (resp[4] >> 3) & 0x1; | |
1750 | ||
1751 | /* Sanitize the data */ | |
1752 | switch (ssif_info->multi_support) { | |
1753 | case SSIF_NO_MULTI: | |
1754 | if (ssif_info->max_xmit_msg_size > 32) | |
1755 | ssif_info->max_xmit_msg_size = 32; | |
1756 | if (ssif_info->max_recv_msg_size > 32) | |
1757 | ssif_info->max_recv_msg_size = 32; | |
1758 | break; | |
1759 | ||
1760 | case SSIF_MULTI_2_PART: | |
3d69d43b CM |
1761 | if (ssif_info->max_xmit_msg_size > 63) |
1762 | ssif_info->max_xmit_msg_size = 63; | |
25930707 CM |
1763 | if (ssif_info->max_recv_msg_size > 62) |
1764 | ssif_info->max_recv_msg_size = 62; | |
1765 | break; | |
1766 | ||
1767 | case SSIF_MULTI_n_PART: | |
10042504 | 1768 | /* We take whatever size given, but do some testing. */ |
25930707 CM |
1769 | break; |
1770 | ||
1771 | default: | |
1772 | /* Data is not sane, just give up. */ | |
1773 | goto no_support; | |
1774 | } | |
1775 | } else { | |
1776 | no_support: | |
1777 | /* Assume no multi-part or PEC support */ | |
83af4194 CM |
1778 | dev_info(&ssif_info->client->dev, |
1779 | "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n", | |
25880f7d | 1780 | rv, len, resp[2]); |
25930707 CM |
1781 | |
1782 | ssif_info->max_xmit_msg_size = 32; | |
1783 | ssif_info->max_recv_msg_size = 32; | |
1784 | ssif_info->multi_support = SSIF_NO_MULTI; | |
1785 | ssif_info->supports_pec = 0; | |
1786 | } | |
1787 | ||
10042504 CM |
1788 | test_multipart_messages(client, ssif_info, resp); |
1789 | ||
25930707 CM |
1790 | /* Make sure the NMI timeout is cleared. */ |
1791 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1792 | msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; | |
1793 | msg[2] = WDT_PRE_TIMEOUT_INT; | |
1794 | rv = do_cmd(client, 3, msg, &len, resp); | |
1795 | if (rv || (len < 3) || (resp[2] != 0)) | |
83af4194 CM |
1796 | dev_warn(&ssif_info->client->dev, |
1797 | "Unable to clear message flags: %d %d %2.2x\n", | |
1798 | rv, len, resp[2]); | |
25930707 CM |
1799 | |
1800 | /* Attempt to enable the event buffer. */ | |
1801 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1802 | msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; | |
1803 | rv = do_cmd(client, 2, msg, &len, resp); | |
1804 | if (rv || (len < 4) || (resp[2] != 0)) { | |
83af4194 CM |
1805 | dev_warn(&ssif_info->client->dev, |
1806 | "Error getting global enables: %d %d %2.2x\n", | |
1807 | rv, len, resp[2]); | |
25930707 CM |
1808 | rv = 0; /* Not fatal */ |
1809 | goto found; | |
1810 | } | |
1811 | ||
91620521 CM |
1812 | ssif_info->global_enables = resp[3]; |
1813 | ||
25930707 CM |
1814 | if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
1815 | ssif_info->has_event_buffer = true; | |
1816 | /* buffer is already enabled, nothing to do. */ | |
1817 | goto found; | |
1818 | } | |
1819 | ||
1820 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; | |
1821 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
91620521 | 1822 | msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF; |
25930707 CM |
1823 | rv = do_cmd(client, 3, msg, &len, resp); |
1824 | if (rv || (len < 2)) { | |
83af4194 CM |
1825 | dev_warn(&ssif_info->client->dev, |
1826 | "Error setting global enables: %d %d %2.2x\n", | |
1827 | rv, len, resp[2]); | |
25930707 CM |
1828 | rv = 0; /* Not fatal */ |
1829 | goto found; | |
1830 | } | |
1831 | ||
91620521 | 1832 | if (resp[2] == 0) { |
25930707 CM |
1833 | /* A successful return means the event buffer is supported. */ |
1834 | ssif_info->has_event_buffer = true; | |
91620521 CM |
1835 | ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF; |
1836 | } | |
1837 | ||
bf2d0877 CM |
1838 | /* Some systems don't behave well if you enable alerts. */ |
1839 | if (alerts_broken) | |
1840 | goto found; | |
1841 | ||
91620521 CM |
1842 | msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
1843 | msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; | |
1844 | msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR; | |
1845 | rv = do_cmd(client, 3, msg, &len, resp); | |
1846 | if (rv || (len < 2)) { | |
83af4194 CM |
1847 | dev_warn(&ssif_info->client->dev, |
1848 | "Error setting global enables: %d %d %2.2x\n", | |
1849 | rv, len, resp[2]); | |
91620521 CM |
1850 | rv = 0; /* Not fatal */ |
1851 | goto found; | |
1852 | } | |
1853 | ||
1854 | if (resp[2] == 0) { | |
1855 | /* A successful return means the alert is supported. */ | |
1856 | ssif_info->supports_alert = true; | |
1857 | ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR; | |
1858 | } | |
25930707 CM |
1859 | |
1860 | found: | |
25930707 | 1861 | if (ssif_dbg_probe) { |
83af4194 CM |
1862 | dev_dbg(&ssif_info->client->dev, |
1863 | "%s: i2c_probe found device at i2c address %x\n", | |
1864 | __func__, client->addr); | |
25930707 CM |
1865 | } |
1866 | ||
1867 | spin_lock_init(&ssif_info->lock); | |
1868 | ssif_info->ssif_state = SSIF_NORMAL; | |
e99e88a9 | 1869 | timer_setup(&ssif_info->retry_timer, retry_timeout, 0); |
a1466ec5 | 1870 | timer_setup(&ssif_info->watch_timer, watch_timeout, 0); |
25930707 CM |
1871 | |
1872 | for (i = 0; i < SSIF_NUM_STATS; i++) | |
1873 | atomic_set(&ssif_info->stats[i], 0); | |
1874 | ||
1875 | if (ssif_info->supports_pec) | |
1876 | ssif_info->client->flags |= I2C_CLIENT_PEC; | |
1877 | ||
1878 | ssif_info->handlers.owner = THIS_MODULE; | |
1879 | ssif_info->handlers.start_processing = ssif_start_processing; | |
a313dec6 | 1880 | ssif_info->handlers.shutdown = shutdown_ssif; |
25930707 CM |
1881 | ssif_info->handlers.get_smi_info = get_smi_info; |
1882 | ssif_info->handlers.sender = sender; | |
1883 | ssif_info->handlers.request_events = request_events; | |
a1466ec5 | 1884 | ssif_info->handlers.set_need_watch = ssif_set_need_watch; |
25930707 CM |
1885 | |
1886 | { | |
1887 | unsigned int thread_num; | |
1888 | ||
be8647d2 CM |
1889 | thread_num = ((i2c_adapter_id(ssif_info->client->adapter) |
1890 | << 8) | | |
25930707 CM |
1891 | ssif_info->client->addr); |
1892 | init_completion(&ssif_info->wake_thread); | |
1893 | ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info, | |
1894 | "kssif%4.4x", thread_num); | |
1895 | if (IS_ERR(ssif_info->thread)) { | |
1896 | rv = PTR_ERR(ssif_info->thread); | |
1897 | dev_notice(&ssif_info->client->dev, | |
1898 | "Could not start kernel thread: error %d\n", | |
1899 | rv); | |
1900 | goto out; | |
1901 | } | |
1902 | } | |
1903 | ||
ac2673d5 CM |
1904 | dev_set_drvdata(&ssif_info->client->dev, ssif_info); |
1905 | rv = device_add_group(&ssif_info->client->dev, | |
1906 | &ipmi_ssif_dev_attr_group); | |
1907 | if (rv) { | |
1908 | dev_err(&ssif_info->client->dev, | |
1909 | "Unable to add device attributes: error %d\n", | |
1910 | rv); | |
1911 | goto out; | |
1912 | } | |
1913 | ||
25930707 CM |
1914 | rv = ipmi_register_smi(&ssif_info->handlers, |
1915 | ssif_info, | |
25930707 CM |
1916 | &ssif_info->client->dev, |
1917 | slave_addr); | |
d5a2197b | 1918 | if (rv) { |
83af4194 CM |
1919 | dev_err(&ssif_info->client->dev, |
1920 | "Unable to register device: error %d\n", rv); | |
ac2673d5 | 1921 | goto out_remove_attr; |
25930707 CM |
1922 | } |
1923 | ||
25930707 | 1924 | out: |
0944d889 | 1925 | if (rv) { |
a8627cda GS |
1926 | if (addr_info) |
1927 | addr_info->client = NULL; | |
1928 | ||
83af4194 CM |
1929 | dev_err(&ssif_info->client->dev, |
1930 | "Unable to start IPMI SSIF: %d\n", rv); | |
25930707 | 1931 | kfree(ssif_info); |
0944d889 | 1932 | } |
25930707 | 1933 | kfree(resp); |
c4436c91 | 1934 | mutex_unlock(&ssif_infos_mutex); |
25930707 CM |
1935 | return rv; |
1936 | ||
ac2673d5 CM |
1937 | out_remove_attr: |
1938 | device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group); | |
1939 | dev_set_drvdata(&ssif_info->client->dev, NULL); | |
25930707 CM |
1940 | goto out; |
1941 | } | |
1942 | ||
1943 | static int ssif_adapter_handler(struct device *adev, void *opaque) | |
1944 | { | |
1945 | struct ssif_addr_info *addr_info = opaque; | |
1946 | ||
1947 | if (adev->type != &i2c_adapter_type) | |
1948 | return 0; | |
1949 | ||
653d3747 WS |
1950 | addr_info->added_client = i2c_new_client_device(to_i2c_adapter(adev), |
1951 | &addr_info->binfo); | |
25930707 CM |
1952 | |
1953 | if (!addr_info->adapter_name) | |
1954 | return 1; /* Only try the first I2C adapter by default. */ | |
1955 | return 0; | |
1956 | } | |
1957 | ||
1958 | static int new_ssif_client(int addr, char *adapter_name, | |
1959 | int debug, int slave_addr, | |
0944d889 CM |
1960 | enum ipmi_addr_src addr_src, |
1961 | struct device *dev) | |
25930707 CM |
1962 | { |
1963 | struct ssif_addr_info *addr_info; | |
1964 | int rv = 0; | |
1965 | ||
1966 | mutex_lock(&ssif_infos_mutex); | |
1967 | if (ssif_info_find(addr, adapter_name, false)) { | |
1968 | rv = -EEXIST; | |
1969 | goto out_unlock; | |
1970 | } | |
1971 | ||
1972 | addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL); | |
1973 | if (!addr_info) { | |
1974 | rv = -ENOMEM; | |
1975 | goto out_unlock; | |
1976 | } | |
1977 | ||
1978 | if (adapter_name) { | |
1979 | addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL); | |
1980 | if (!addr_info->adapter_name) { | |
1981 | kfree(addr_info); | |
1982 | rv = -ENOMEM; | |
1983 | goto out_unlock; | |
1984 | } | |
1985 | } | |
1986 | ||
1987 | strncpy(addr_info->binfo.type, DEVICE_NAME, | |
1988 | sizeof(addr_info->binfo.type)); | |
1989 | addr_info->binfo.addr = addr; | |
1990 | addr_info->binfo.platform_data = addr_info; | |
1991 | addr_info->debug = debug; | |
1992 | addr_info->slave_addr = slave_addr; | |
1993 | addr_info->addr_src = addr_src; | |
0944d889 CM |
1994 | addr_info->dev = dev; |
1995 | ||
87ff091c CM |
1996 | if (dev) |
1997 | dev_set_drvdata(dev, addr_info); | |
25930707 CM |
1998 | |
1999 | list_add_tail(&addr_info->link, &ssif_infos); | |
2000 | ||
2001 | if (initialized) | |
2002 | i2c_for_each_dev(addr_info, ssif_adapter_handler); | |
2003 | /* Otherwise address list will get it */ | |
2004 | ||
2005 | out_unlock: | |
2006 | mutex_unlock(&ssif_infos_mutex); | |
2007 | return rv; | |
2008 | } | |
2009 | ||
2010 | static void free_ssif_clients(void) | |
2011 | { | |
2012 | struct ssif_addr_info *info, *tmp; | |
2013 | ||
2014 | mutex_lock(&ssif_infos_mutex); | |
2015 | list_for_each_entry_safe(info, tmp, &ssif_infos, link) { | |
2016 | list_del(&info->link); | |
2017 | kfree(info->adapter_name); | |
2018 | kfree(info); | |
2019 | } | |
2020 | mutex_unlock(&ssif_infos_mutex); | |
2021 | } | |
2022 | ||
2023 | static unsigned short *ssif_address_list(void) | |
2024 | { | |
2025 | struct ssif_addr_info *info; | |
c75c5075 | 2026 | unsigned int count = 0, i = 0; |
25930707 CM |
2027 | unsigned short *address_list; |
2028 | ||
2029 | list_for_each_entry(info, &ssif_infos, link) | |
2030 | count++; | |
2031 | ||
6396bb22 KC |
2032 | address_list = kcalloc(count + 1, sizeof(*address_list), |
2033 | GFP_KERNEL); | |
25930707 CM |
2034 | if (!address_list) |
2035 | return NULL; | |
2036 | ||
25930707 CM |
2037 | list_for_each_entry(info, &ssif_infos, link) { |
2038 | unsigned short addr = info->binfo.addr; | |
2039 | int j; | |
2040 | ||
2041 | for (j = 0; j < i; j++) { | |
2042 | if (address_list[j] == addr) | |
c75c5075 CM |
2043 | /* Found a dup. */ |
2044 | break; | |
25930707 | 2045 | } |
c75c5075 CM |
2046 | if (j == i) /* Didn't find it in the list. */ |
2047 | address_list[i++] = addr; | |
25930707 CM |
2048 | } |
2049 | address_list[i] = I2C_CLIENT_END; | |
2050 | ||
2051 | return address_list; | |
2052 | } | |
2053 | ||
2054 | #ifdef CONFIG_ACPI | |
5186cf9c | 2055 | static const struct acpi_device_id ssif_acpi_match[] = { |
25930707 CM |
2056 | { "IPI0001", 0 }, |
2057 | { }, | |
2058 | }; | |
2059 | MODULE_DEVICE_TABLE(acpi, ssif_acpi_match); | |
25930707 CM |
2060 | #endif |
2061 | ||
2062 | #ifdef CONFIG_DMI | |
0944d889 | 2063 | static int dmi_ipmi_probe(struct platform_device *pdev) |
25930707 | 2064 | { |
95e300c0 | 2065 | u8 slave_addr = 0; |
0944d889 CM |
2066 | u16 i2c_addr; |
2067 | int rv; | |
25930707 | 2068 | |
0944d889 CM |
2069 | if (!ssif_trydmi) |
2070 | return -ENODEV; | |
25930707 | 2071 | |
0944d889 CM |
2072 | rv = device_property_read_u16(&pdev->dev, "i2c-addr", &i2c_addr); |
2073 | if (rv) { | |
25880f7d | 2074 | dev_warn(&pdev->dev, "No i2c-addr property\n"); |
0944d889 | 2075 | return -ENODEV; |
25930707 CM |
2076 | } |
2077 | ||
0944d889 CM |
2078 | rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr); |
2079 | if (rv) | |
ed6c3a6d | 2080 | slave_addr = 0x20; |
25930707 | 2081 | |
0944d889 CM |
2082 | return new_ssif_client(i2c_addr, NULL, 0, |
2083 | slave_addr, SI_SMBIOS, &pdev->dev); | |
25930707 CM |
2084 | } |
2085 | #else | |
0944d889 CM |
2086 | static int dmi_ipmi_probe(struct platform_device *pdev) |
2087 | { | |
2088 | return -ENODEV; | |
2089 | } | |
25930707 CM |
2090 | #endif |
2091 | ||
2092 | static const struct i2c_device_id ssif_id[] = { | |
2093 | { DEVICE_NAME, 0 }, | |
2094 | { } | |
2095 | }; | |
2096 | MODULE_DEVICE_TABLE(i2c, ssif_id); | |
2097 | ||
2098 | static struct i2c_driver ssif_i2c_driver = { | |
2099 | .class = I2C_CLASS_HWMON, | |
2100 | .driver = { | |
25930707 CM |
2101 | .name = DEVICE_NAME |
2102 | }, | |
2103 | .probe = ssif_probe, | |
2104 | .remove = ssif_remove, | |
91620521 | 2105 | .alert = ssif_alert, |
25930707 CM |
2106 | .id_table = ssif_id, |
2107 | .detect = ssif_detect | |
2108 | }; | |
2109 | ||
0944d889 CM |
2110 | static int ssif_platform_probe(struct platform_device *dev) |
2111 | { | |
2112 | return dmi_ipmi_probe(dev); | |
2113 | } | |
2114 | ||
2115 | static int ssif_platform_remove(struct platform_device *dev) | |
2116 | { | |
2117 | struct ssif_addr_info *addr_info = dev_get_drvdata(&dev->dev); | |
2118 | ||
2119 | if (!addr_info) | |
2120 | return 0; | |
2121 | ||
2122 | mutex_lock(&ssif_infos_mutex); | |
0745dde6 | 2123 | i2c_unregister_device(addr_info->added_client); |
0944d889 CM |
2124 | |
2125 | list_del(&addr_info->link); | |
2126 | kfree(addr_info); | |
2127 | mutex_unlock(&ssif_infos_mutex); | |
2128 | return 0; | |
2129 | } | |
2130 | ||
b3096c70 CM |
2131 | static const struct platform_device_id ssif_plat_ids[] = { |
2132 | { "dmi-ipmi-ssif", 0 }, | |
2133 | { } | |
2134 | }; | |
2135 | ||
0944d889 CM |
2136 | static struct platform_driver ipmi_driver = { |
2137 | .driver = { | |
2138 | .name = DEVICE_NAME, | |
2139 | }, | |
2140 | .probe = ssif_platform_probe, | |
2141 | .remove = ssif_platform_remove, | |
b3096c70 | 2142 | .id_table = ssif_plat_ids |
0944d889 CM |
2143 | }; |
2144 | ||
25930707 CM |
2145 | static int init_ipmi_ssif(void) |
2146 | { | |
2147 | int i; | |
2148 | int rv; | |
2149 | ||
2150 | if (initialized) | |
2151 | return 0; | |
2152 | ||
2153 | pr_info("IPMI SSIF Interface driver\n"); | |
2154 | ||
2155 | /* build list for i2c from addr list */ | |
2156 | for (i = 0; i < num_addrs; i++) { | |
2157 | rv = new_ssif_client(addr[i], adapter_name[i], | |
2158 | dbg[i], slave_addrs[i], | |
0944d889 | 2159 | SI_HARDCODED, NULL); |
d467f7a4 | 2160 | if (rv) |
25880f7d | 2161 | pr_err("Couldn't add hardcoded device at addr 0x%x\n", |
25930707 CM |
2162 | addr[i]); |
2163 | } | |
2164 | ||
2165 | if (ssif_tryacpi) | |
2166 | ssif_i2c_driver.driver.acpi_match_table = | |
2167 | ACPI_PTR(ssif_acpi_match); | |
0944d889 | 2168 | |
0944d889 CM |
2169 | if (ssif_trydmi) { |
2170 | rv = platform_driver_register(&ipmi_driver); | |
2171 | if (rv) | |
25880f7d | 2172 | pr_err("Unable to register driver: %d\n", rv); |
2cd0e544 KW |
2173 | else |
2174 | platform_registered = true; | |
0944d889 CM |
2175 | } |
2176 | ||
25930707 CM |
2177 | ssif_i2c_driver.address_list = ssif_address_list(); |
2178 | ||
2179 | rv = i2c_add_driver(&ssif_i2c_driver); | |
2180 | if (!rv) | |
2181 | initialized = true; | |
2182 | ||
2183 | return rv; | |
2184 | } | |
2185 | module_init(init_ipmi_ssif); | |
2186 | ||
2187 | static void cleanup_ipmi_ssif(void) | |
2188 | { | |
2189 | if (!initialized) | |
2190 | return; | |
2191 | ||
2192 | initialized = false; | |
2193 | ||
2194 | i2c_del_driver(&ssif_i2c_driver); | |
2195 | ||
36e398d7 CM |
2196 | kfree(ssif_i2c_driver.address_list); |
2197 | ||
2cd0e544 | 2198 | if (ssif_trydmi && platform_registered) |
44f56a39 | 2199 | platform_driver_unregister(&ipmi_driver); |
0944d889 | 2200 | |
25930707 CM |
2201 | free_ssif_clients(); |
2202 | } | |
2203 | module_exit(cleanup_ipmi_ssif); | |
2204 | ||
0944d889 | 2205 | MODULE_ALIAS("platform:dmi-ipmi-ssif"); |
25930707 CM |
2206 | MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>"); |
2207 | MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus"); | |
2208 | MODULE_LICENSE("GPL"); |