drivers/char/ipmi/ipmi_ssif.c

   1 /*
   2  * ipmi_ssif.c
   3  *
   4  * The interface to the IPMI driver for SMBus access to a SMBus
   5  * compliant device.  Called SSIF by the IPMI spec.
   6  *
   7  * Author: Intel Corporation
   8  *         Todd Davis <todd.c.davis@intel.com>
   9  *
  10  * Rewritten by Corey Minyard <minyard@acm.org> to support the
  11  * non-blocking I2C interface, add support for multi-part
  12  * transactions, add PEC support, and general clenaup.
  13  *
  14  * Copyright 2003 Intel Corporation
  15  * Copyright 2005 MontaVista Software
  16  *
  17  *  This program is free software; you can redistribute it and/or modify it
  18  *  under the terms of the GNU General Public License as published by the
  19  *  Free Software Foundation; either version 2 of the License, or (at your
  20  *  option) any later version.
  21  */
  22
  23 /*
  24  * This file holds the "policy" for the interface to the SSIF state
  25  * machine.  It does the configuration, handles timers and interrupts,
  26  * and drives the real SSIF state machine.
  27  */
  28
  29 /*
  30  * TODO: Figure out how to use SMB alerts.  This will require a new
  31  * interface into the I2C driver, I believe.
  32  */
  33
  34 #if defined(MODVERSIONS)
  35 #include <linux/modversions.h>
  36 #endif
  37
  38 #include <linux/module.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/sched.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/timer.h>
  43 #include <linux/delay.h>
  44 #include <linux/errno.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/slab.h>
  47 #include <linux/list.h>
  48 #include <linux/i2c.h>
  49 #include <linux/ipmi_smi.h>
  50 #include <linux/init.h>
  51 #include <linux/dmi.h>
  52 #include <linux/kthread.h>
  53 #include <linux/acpi.h>
  54 #include <linux/ctype.h>
  55
  56 #define PFX "ipmi_ssif: "
  57 #define DEVICE_NAME "ipmi_ssif"
  58
  59 #define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD      0x57
  60
  61 #define SSIF_IPMI_REQUEST                       2
  62 #define SSIF_IPMI_MULTI_PART_REQUEST_START      6
  63 #define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE     7
  64 #define SSIF_IPMI_RESPONSE                      3
  65 #define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE    9
  66
  67 /* ssif_debug is a bit-field
  68  *      SSIF_DEBUG_MSG -        commands and their responses
  69  *      SSIF_DEBUG_STATES -     message states
  70  *      SSIF_DEBUG_TIMING -      Measure times between events in the driver
  71  */
  72 #define SSIF_DEBUG_TIMING       4
  73 #define SSIF_DEBUG_STATE        2
  74 #define SSIF_DEBUG_MSG          1
  75 #define SSIF_NODEBUG            0
  76 #define SSIF_DEFAULT_DEBUG      (SSIF_NODEBUG)
  77
  78 /*
  79  * Timer values
  80  */
  81 #define SSIF_MSG_USEC           20000   /* 20ms between message tries. */
  82 #define SSIF_MSG_PART_USEC      5000    /* 5ms for a message part */
  83
  84 /* How many times to we retry sending/receiving the message. */
  85 #define SSIF_SEND_RETRIES       5
  86 #define SSIF_RECV_RETRIES       250
  87
  88 #define SSIF_MSG_MSEC           (SSIF_MSG_USEC / 1000)
  89 #define SSIF_MSG_JIFFIES        ((SSIF_MSG_USEC * 1000) / TICK_NSEC)
  90 #define SSIF_MSG_PART_JIFFIES   ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC)
  91
  92 enum ssif_intf_state {
  93         SSIF_NORMAL,
  94         SSIF_GETTING_FLAGS,
  95         SSIF_GETTING_EVENTS,
  96         SSIF_CLEARING_FLAGS,
  97         SSIF_GETTING_MESSAGES,
  98         /* FIXME - add watchdog stuff. */
  99 };
 100
 101 #define SSIF_IDLE(ssif)  ((ssif)->ssif_state == SSIF_NORMAL \
 102                           && (ssif)->curr_msg == NULL)
 103
 104 /*
 105  * Indexes into stats[] in ssif_info below.
 106  */
 107 enum ssif_stat_indexes {
 108         /* Number of total messages sent. */
 109         SSIF_STAT_sent_messages = 0,
 110
 111         /*
 112          * Number of message parts sent.  Messages may be broken into
 113          * parts if they are long.
 114          */
 115         SSIF_STAT_sent_messages_parts,
 116
 117         /*
 118          * Number of time a message was retried.
 119          */
 120         SSIF_STAT_send_retries,
 121
 122         /*
 123          * Number of times the send of a message failed.
 124          */
 125         SSIF_STAT_send_errors,
 126
 127         /*
 128          * Number of message responses received.
 129          */
 130         SSIF_STAT_received_messages,
 131
 132         /*
 133          * Number of message fragments received.
 134          */
 135         SSIF_STAT_received_message_parts,
 136
 137         /*
 138          * Number of times the receive of a message was retried.
 139          */
 140         SSIF_STAT_receive_retries,
 141
 142         /*
 143          * Number of errors receiving messages.
 144          */
 145         SSIF_STAT_receive_errors,
 146
 147         /*
 148          * Number of times a flag fetch was requested.
 149          */
 150         SSIF_STAT_flag_fetches,
 151
 152         /*
 153          * Number of times the hardware didn't follow the state machine.
 154          */
 155         SSIF_STAT_hosed,
 156
 157         /*
 158          * Number of received events.
 159          */
 160         SSIF_STAT_events,
 161
 162         /* Number of asyncronous messages received. */
 163         SSIF_STAT_incoming_messages,
 164
 165         /* Number of watchdog pretimeouts. */
 166         SSIF_STAT_watchdog_pretimeouts,
 167
 168         /* Number of alers received. */
 169         SSIF_STAT_alerts,
 170
 171         /* Always add statistics before this value, it must be last. */
 172         SSIF_NUM_STATS
 173 };
 174
 175 struct ssif_addr_info {
 176         unsigned short addr;
 177         struct i2c_board_info binfo;
 178         char *adapter_name;
 179         int debug;
 180         int slave_addr;
 181         enum ipmi_addr_src addr_src;
 182         union ipmi_smi_info_union addr_info;
 183
 184         struct mutex clients_mutex;
 185         struct list_head clients;
 186
 187         struct list_head link;
 188 };
 189
 190 struct ssif_info;
 191
 192 typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result,
 193                              unsigned char *data, unsigned int len);
 194
 195 struct ssif_info {
 196         ipmi_smi_t          intf;
 197         int                 intf_num;
 198         spinlock_t          lock;
 199         struct ipmi_smi_msg *waiting_msg;
 200         struct ipmi_smi_msg *curr_msg;
 201         enum ssif_intf_state ssif_state;
 202         unsigned long       ssif_debug;
 203
 204         struct ipmi_smi_handlers handlers;
 205
 206         enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
 207         union ipmi_smi_info_union addr_info;
 208
 209         /*
 210          * Flags from the last GET_MSG_FLAGS command, used when an ATTN
 211          * is set to hold the flags until we are done handling everything
 212          * from the flags.
 213          */
 214 #define RECEIVE_MSG_AVAIL       0x01
 215 #define EVENT_MSG_BUFFER_FULL   0x02
 216 #define WDT_PRE_TIMEOUT_INT     0x08
 217         unsigned char       msg_flags;
 218
 219         u8                  global_enables;
 220         bool                has_event_buffer;
 221         bool                supports_alert;
 222
 223         /*
 224          * Used to tell what we should do with alerts.  If we are
 225          * waiting on a response, read the data immediately.
 226          */
 227         bool                got_alert;
 228         bool                waiting_alert;
 229
 230         /*
 231          * If set to true, this will request events the next time the
 232          * state machine is idle.
 233          */
 234         bool                req_events;
 235
 236         /*
 237          * If set to true, this will request flags the next time the
 238          * state machine is idle.
 239          */
 240         bool                req_flags;
 241
 242         /*
 243          * Used to perform timer operations when run-to-completion
 244          * mode is on.  This is a countdown timer.
 245          */
 246         int                 rtc_us_timer;
 247
 248         /* Used for sending/receiving data.  +1 for the length. */
 249         unsigned char data[IPMI_MAX_MSG_LENGTH + 1];
 250         unsigned int  data_len;
 251
 252         /* Temp receive buffer, gets copied into data. */
 253         unsigned char recv[I2C_SMBUS_BLOCK_MAX];
 254
 255         struct i2c_client *client;
 256         ssif_i2c_done done_handler;
 257
 258         /* Thread interface handling */
 259         struct task_struct *thread;
 260         struct completion wake_thread;
 261         bool stopping;
 262         int i2c_read_write;
 263         int i2c_command;
 264         unsigned char *i2c_data;
 265         unsigned int i2c_size;
 266
 267         /* From the device id response. */
 268         struct ipmi_device_id device_id;
 269
 270         struct timer_list retry_timer;
 271         int retries_left;
 272
 273         /* Info from SSIF cmd */
 274         unsigned char max_xmit_msg_size;
 275         unsigned char max_recv_msg_size;
 276         unsigned int  multi_support;
 277         int           supports_pec;
 278
 279 #define SSIF_NO_MULTI           0
 280 #define SSIF_MULTI_2_PART       1
 281 #define SSIF_MULTI_n_PART       2
 282         unsigned char *multi_data;
 283         unsigned int  multi_len;
 284         unsigned int  multi_pos;
 285
 286         atomic_t stats[SSIF_NUM_STATS];
 287 };
 288
 289 #define ssif_inc_stat(ssif, stat) \
 290         atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat])
 291 #define ssif_get_stat(ssif, stat) \
 292         ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
 293
 294 static bool initialized;
 295
 296 static atomic_t next_intf = ATOMIC_INIT(0);
 297
 298 static void return_hosed_msg(struct ssif_info *ssif_info,
 299                              struct ipmi_smi_msg *msg);
 300 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags);
 301 static int start_send(struct ssif_info *ssif_info,
 302                       unsigned char   *data,
 303                       unsigned int    len);
 304
 305 static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info,
 306                                           unsigned long *flags)
 307 {
 308         spin_lock_irqsave(&ssif_info->lock, *flags);
 309         return flags;
 310 }
 311
 312 static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info,
 313                                   unsigned long *flags)
 314 {
 315         spin_unlock_irqrestore(&ssif_info->lock, *flags);
 316 }
 317
 318 static void deliver_recv_msg(struct ssif_info *ssif_info,
 319                              struct ipmi_smi_msg *msg)
 320 {
 321         ipmi_smi_t    intf = ssif_info->intf;
 322
 323         if (!intf) {
 324                 ipmi_free_smi_msg(msg);
 325         } else if (msg->rsp_size < 0) {
 326                 return_hosed_msg(ssif_info, msg);
 327                 pr_err(PFX
 328                        "Malformed message in deliver_recv_msg: rsp_size = %d\n",
 329                        msg->rsp_size);
 330         } else {
 331                 ipmi_smi_msg_received(intf, msg);
 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
 351  * message lock.  Note that the caller will check SSIF_IDLE and start a
 352  * new operation, so there is no need to check for new messages to
 353  * start in here.
 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. */
 370                 ssif_info->ssif_state = SSIF_NORMAL;
 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)
 385                 ssif_info->ssif_state = SSIF_NORMAL;
 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;
 396                 ssif_info->ssif_state = SSIF_NORMAL;
 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) {
 410                 ssif_info->ssif_state = SSIF_NORMAL;
 411                 return;
 412         }
 413
 414         ssif_info->curr_msg = msg;
 415         ssif_info->ssif_state = SSIF_GETTING_EVENTS;
 416         ipmi_ssif_unlock_cond(ssif_info, flags);
 417
 418         msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
 419         msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
 420         msg->data_size = 2;
 421
 422         check_start_send(ssif_info, flags, msg);
 423 }
 424
 425 static void start_recv_msg_fetch(struct ssif_info *ssif_info,
 426                                  unsigned long *flags)
 427 {
 428         struct ipmi_smi_msg *msg;
 429
 430         msg = ipmi_alloc_smi_msg();
 431         if (!msg) {
 432                 ssif_info->ssif_state = SSIF_NORMAL;
 433                 return;
 434         }
 435
 436         ssif_info->curr_msg = msg;
 437         ssif_info->ssif_state = SSIF_GETTING_MESSAGES;
 438         ipmi_ssif_unlock_cond(ssif_info, flags);
 439
 440         msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
 441         msg->data[1] = IPMI_GET_MSG_CMD;
 442         msg->data_size = 2;
 443
 444         check_start_send(ssif_info, flags, msg);
 445 }
 446
 447 /*
 448  * Must be called with the message lock held.  This will release the
 449  * message lock.  Note that the caller will check SSIF_IDLE and start a
 450  * new operation, so there is no need to check for new messages to
 451  * start in here.
 452  */
 453 static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags)
 454 {
 455         if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
 456                 ipmi_smi_t intf = ssif_info->intf;
 457                 /* Watchdog pre-timeout */
 458                 ssif_inc_stat(ssif_info, watchdog_pretimeouts);
 459                 start_clear_flags(ssif_info, flags);
 460                 if (intf)
 461                         ipmi_smi_watchdog_pretimeout(intf);
 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 {
 469                 ssif_info->ssif_state = SSIF_NORMAL;
 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 */
 482                 result = wait_for_completion_interruptible(
 483                                                 &ssif_info->wake_thread);
 484                 if (ssif_info->stopping)
 485                         break;
 486                 if (result == -ERESTARTSYS)
 487                         continue;
 488                 init_completion(&ssif_info->wake_thread);
 489
 490                 if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) {
 491                         result = i2c_smbus_write_block_data(
 492                                 ssif_info->client, SSIF_IPMI_REQUEST,
 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(
 498                                 ssif_info->client, SSIF_IPMI_RESPONSE,
 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
 513 static int ssif_i2c_send(struct ssif_info *ssif_info,
 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);
 525         return 0;
 526 }
 527
 528
 529 static void msg_done_handler(struct ssif_info *ssif_info, int result,
 530                              unsigned char *data, unsigned int len);
 531
 532 static void start_get(struct ssif_info *ssif_info)
 533 {
 534         int rv;
 535
 536         ssif_info->rtc_us_timer = 0;
 537
 538         rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
 539                           SSIF_IPMI_RESPONSE,
 540                           ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
 541         if (rv < 0) {
 542                 /* request failed, just return the error. */
 543                 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 544                         pr_info("Error from i2c_non_blocking_op(5)\n");
 545
 546                 msg_done_handler(ssif_info, -EIO, NULL, 0);
 547         }
 548 }
 549
 550 static void retry_timeout(unsigned long data)
 551 {
 552         struct ssif_info *ssif_info = (void *) data;
 553         unsigned long oflags, *flags;
 554         bool waiting;
 555
 556         if (ssif_info->stopping)
 557                 return;
 558
 559         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 560         waiting = ssif_info->waiting_alert;
 561         ssif_info->waiting_alert = false;
 562         ipmi_ssif_unlock_cond(ssif_info, flags);
 563
 564         if (waiting)
 565                 start_get(ssif_info);
 566 }
 567
 568
 569 static void ssif_alert(struct i2c_client *client, unsigned int data)
 570 {
 571         struct ssif_info *ssif_info = i2c_get_clientdata(client);
 572         unsigned long oflags, *flags;
 573         bool do_get = false;
 574
 575         ssif_inc_stat(ssif_info, alerts);
 576
 577         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 578         if (ssif_info->waiting_alert) {
 579                 ssif_info->waiting_alert = false;
 580                 del_timer(&ssif_info->retry_timer);
 581                 do_get = true;
 582         } else if (ssif_info->curr_msg) {
 583                 ssif_info->got_alert = true;
 584         }
 585         ipmi_ssif_unlock_cond(ssif_info, flags);
 586         if (do_get)
 587                 start_get(ssif_info);
 588 }
 589
 590 static int start_resend(struct ssif_info *ssif_info);
 591
 592 static void msg_done_handler(struct ssif_info *ssif_info, int result,
 593                              unsigned char *data, unsigned int len)
 594 {
 595         struct ipmi_smi_msg *msg;
 596         unsigned long oflags, *flags;
 597         int rv;
 598
 599         /*
 600          * We are single-threaded here, so no need for a lock until we
 601          * start messing with driver states or the queues.
 602          */
 603
 604         if (result < 0) {
 605                 ssif_info->retries_left--;
 606                 if (ssif_info->retries_left > 0) {
 607                         ssif_inc_stat(ssif_info, receive_retries);
 608
 609                         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 610                         ssif_info->waiting_alert = true;
 611                         ssif_info->rtc_us_timer = SSIF_MSG_USEC;
 612                         mod_timer(&ssif_info->retry_timer,
 613                                   jiffies + SSIF_MSG_JIFFIES);
 614                         ipmi_ssif_unlock_cond(ssif_info, flags);
 615                         return;
 616                 }
 617
 618                 ssif_inc_stat(ssif_info, receive_errors);
 619
 620                 if  (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 621                         pr_info("Error in msg_done_handler: %d\n", result);
 622                 len = 0;
 623                 goto continue_op;
 624         }
 625
 626         if ((len > 1) && (ssif_info->multi_pos == 0)
 627                                 && (data[0] == 0x00) && (data[1] == 0x01)) {
 628                 /* Start of multi-part read.  Start the next transaction. */
 629                 int i;
 630
 631                 ssif_inc_stat(ssif_info, received_message_parts);
 632
 633                 /* Remove the multi-part read marker. */
 634                 for (i = 0; i < (len-2); i++)
 635                         ssif_info->data[i] = data[i+2];
 636                 len -= 2;
 637                 ssif_info->multi_len = len;
 638                 ssif_info->multi_pos = 1;
 639
 640                 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
 641                                   SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
 642                                   ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
 643                 if (rv < 0) {
 644                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 645                                 pr_info("Error from i2c_non_blocking_op(1)\n");
 646
 647                         result = -EIO;
 648                 } else
 649                         return;
 650         } else if (ssif_info->multi_pos) {
 651                 /* Middle of multi-part read.  Start the next transaction. */
 652                 int i;
 653                 unsigned char blocknum;
 654
 655                 if (len == 0) {
 656                         result = -EIO;
 657                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 658                                 pr_info(PFX "Middle message with no data\n");
 659
 660                         goto continue_op;
 661                 }
 662
 663                 blocknum = data[ssif_info->multi_len];
 664
 665                 if (ssif_info->multi_len+len-1 > IPMI_MAX_MSG_LENGTH) {
 666                         /* Received message too big, abort the operation. */
 667                         result = -E2BIG;
 668                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 669                                 pr_info("Received message too big\n");
 670
 671                         goto continue_op;
 672                 }
 673
 674                 /* Remove the blocknum from the data. */
 675                 for (i = 0; i < (len-1); i++)
 676                         ssif_info->data[i+ssif_info->multi_len] = data[i+1];
 677                 len--;
 678                 ssif_info->multi_len += len;
 679                 if (blocknum == 0xff) {
 680                         /* End of read */
 681                         len = ssif_info->multi_len;
 682                         data = ssif_info->data;
 683                 } else if ((blocknum+1) != ssif_info->multi_pos) {
 684                         /*
 685                          * Out of sequence block, just abort.  Block
 686                          * numbers start at zero for the second block,
 687                          * but multi_pos starts at one, so the +1.
 688                          */
 689                         result = -EIO;
 690                 } else {
 691                         ssif_inc_stat(ssif_info, received_message_parts);
 692
 693                         ssif_info->multi_pos++;
 694
 695                         rv = ssif_i2c_send(ssif_info, msg_done_handler,
 696                                            I2C_SMBUS_READ,
 697                                            SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
 698                                            ssif_info->recv,
 699                                            I2C_SMBUS_BLOCK_DATA);
 700                         if (rv < 0) {
 701                                 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 702                                         pr_info(PFX
 703                                                 "Error from ssif_i2c_send\n");
 704
 705                                 result = -EIO;
 706                         } else
 707                                 return;
 708                 }
 709         }
 710
 711         if (result < 0) {
 712                 ssif_inc_stat(ssif_info, receive_errors);
 713         } else {
 714                 ssif_inc_stat(ssif_info, received_messages);
 715                 ssif_inc_stat(ssif_info, received_message_parts);
 716         }
 717
 718
 719  continue_op:
 720         if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
 721                 pr_info(PFX "DONE 1: state = %d, result=%d.\n",
 722                         ssif_info->ssif_state, result);
 723
 724         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 725         msg = ssif_info->curr_msg;
 726         if (msg) {
 727                 msg->rsp_size = len;
 728                 if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
 729                         msg->rsp_size = IPMI_MAX_MSG_LENGTH;
 730                 memcpy(msg->rsp, data, msg->rsp_size);
 731                 ssif_info->curr_msg = NULL;
 732         }
 733
 734         switch (ssif_info->ssif_state) {
 735         case SSIF_NORMAL:
 736                 ipmi_ssif_unlock_cond(ssif_info, flags);
 737                 if (!msg)
 738                         break;
 739
 740                 if (result < 0)
 741                         return_hosed_msg(ssif_info, msg);
 742                 else
 743                         deliver_recv_msg(ssif_info, msg);
 744                 break;
 745
 746         case SSIF_GETTING_FLAGS:
 747                 /* We got the flags from the SSIF, now handle them. */
 748                 if ((result < 0) || (len < 4) || (data[2] != 0)) {
 749                         /*
 750                          * Error fetching flags, or invalid length,
 751                          * just give up for now.
 752                          */
 753                         ssif_info->ssif_state = SSIF_NORMAL;
 754                         ipmi_ssif_unlock_cond(ssif_info, flags);
 755                         pr_warn(PFX "Error getting flags: %d %d, %x\n",
 756                                result, len, data[2]);
 757                 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 758                            || data[1] != IPMI_GET_MSG_FLAGS_CMD) {
 759                         pr_warn(PFX "Invalid response getting flags: %x %x\n",
 760                                 data[0], data[1]);
 761                 } else {
 762                         ssif_inc_stat(ssif_info, flag_fetches);
 763                         ssif_info->msg_flags = data[3];
 764                         handle_flags(ssif_info, flags);
 765                 }
 766                 break;
 767
 768         case SSIF_CLEARING_FLAGS:
 769                 /* We cleared the flags. */
 770                 if ((result < 0) || (len < 3) || (data[2] != 0)) {
 771                         /* Error clearing flags */
 772                         pr_warn(PFX "Error clearing flags: %d %d, %x\n",
 773                                result, len, data[2]);
 774                 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 775                            || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) {
 776                         pr_warn(PFX "Invalid response clearing flags: %x %x\n",
 777                                 data[0], data[1]);
 778                 }
 779                 ssif_info->ssif_state = SSIF_NORMAL;
 780                 ipmi_ssif_unlock_cond(ssif_info, flags);
 781                 break;
 782
 783         case SSIF_GETTING_EVENTS:
 784                 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
 785                         /* Error getting event, probably done. */
 786                         msg->done(msg);
 787
 788                         /* Take off the event flag. */
 789                         ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
 790                         handle_flags(ssif_info, flags);
 791                 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 792                            || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) {
 793                         pr_warn(PFX "Invalid response getting events: %x %x\n",
 794                                 msg->rsp[0], msg->rsp[1]);
 795                         msg->done(msg);
 796                         /* Take off the event flag. */
 797                         ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
 798                         handle_flags(ssif_info, flags);
 799                 } else {
 800                         handle_flags(ssif_info, flags);
 801                         ssif_inc_stat(ssif_info, events);
 802                         deliver_recv_msg(ssif_info, msg);
 803                 }
 804                 break;
 805
 806         case SSIF_GETTING_MESSAGES:
 807                 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
 808                         /* Error getting event, probably done. */
 809                         msg->done(msg);
 810
 811                         /* Take off the msg flag. */
 812                         ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
 813                         handle_flags(ssif_info, flags);
 814                 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 815                            || msg->rsp[1] != IPMI_GET_MSG_CMD) {
 816                         pr_warn(PFX "Invalid response clearing flags: %x %x\n",
 817                                 msg->rsp[0], msg->rsp[1]);
 818                         msg->done(msg);
 819
 820                         /* Take off the msg flag. */
 821                         ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
 822                         handle_flags(ssif_info, flags);
 823                 } else {
 824                         ssif_inc_stat(ssif_info, incoming_messages);
 825                         handle_flags(ssif_info, flags);
 826                         deliver_recv_msg(ssif_info, msg);
 827                 }
 828                 break;
 829         }
 830
 831         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 832         if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) {
 833                 if (ssif_info->req_events)
 834                         start_event_fetch(ssif_info, flags);
 835                 else if (ssif_info->req_flags)
 836                         start_flag_fetch(ssif_info, flags);
 837                 else
 838                         start_next_msg(ssif_info, flags);
 839         } else
 840                 ipmi_ssif_unlock_cond(ssif_info, flags);
 841
 842         if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
 843                 pr_info(PFX "DONE 2: state = %d.\n", ssif_info->ssif_state);
 844 }
 845
 846 static void msg_written_handler(struct ssif_info *ssif_info, int result,
 847                                 unsigned char *data, unsigned int len)
 848 {
 849         int rv;
 850
 851         /* We are single-threaded here, so no need for a lock. */
 852         if (result < 0) {
 853                 ssif_info->retries_left--;
 854                 if (ssif_info->retries_left > 0) {
 855                         if (!start_resend(ssif_info)) {
 856                                 ssif_inc_stat(ssif_info, send_retries);
 857                                 return;
 858                         }
 859                         /* request failed, just return the error. */
 860                         ssif_inc_stat(ssif_info, send_errors);
 861
 862                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 863                                 pr_info(PFX
 864                                         "Out of retries in msg_written_handler\n");
 865                         msg_done_handler(ssif_info, -EIO, NULL, 0);
 866                         return;
 867                 }
 868
 869                 ssif_inc_stat(ssif_info, send_errors);
 870
 871                 /*
 872                  * Got an error on transmit, let the done routine
 873                  * handle it.
 874                  */
 875                 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 876                         pr_info("Error in msg_written_handler: %d\n", result);
 877
 878                 msg_done_handler(ssif_info, result, NULL, 0);
 879                 return;
 880         }
 881
 882         if (ssif_info->multi_data) {
 883                 /* In the middle of a multi-data write. */
 884                 int left;
 885
 886                 ssif_inc_stat(ssif_info, sent_messages_parts);
 887
 888                 left = ssif_info->multi_len - ssif_info->multi_pos;
 889                 if (left > 32)
 890                         left = 32;
 891                 /* Length byte. */
 892                 ssif_info->multi_data[ssif_info->multi_pos] = left;
 893                 ssif_info->multi_pos += left;
 894                 if (left < 32)
 895                         /*
 896                          * Write is finished.  Note that we must end
 897                          * with a write of less than 32 bytes to
 898                          * complete the transaction, even if it is
 899                          * zero bytes.
 900                          */
 901                         ssif_info->multi_data = NULL;
 902
 903                 rv = ssif_i2c_send(ssif_info, msg_written_handler,
 904                                   I2C_SMBUS_WRITE,
 905                                   SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
 906                                   ssif_info->multi_data + ssif_info->multi_pos,
 907                                   I2C_SMBUS_BLOCK_DATA);
 908                 if (rv < 0) {
 909                         /* request failed, just return the error. */
 910                         ssif_inc_stat(ssif_info, send_errors);
 911
 912                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 913                                 pr_info("Error from i2c_non_blocking_op(3)\n");
 914                         msg_done_handler(ssif_info, -EIO, NULL, 0);
 915                 }
 916         } else {
 917                 unsigned long oflags, *flags;
 918                 bool got_alert;
 919
 920                 ssif_inc_stat(ssif_info, sent_messages);
 921                 ssif_inc_stat(ssif_info, sent_messages_parts);
 922
 923                 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 924                 got_alert = ssif_info->got_alert;
 925                 if (got_alert) {
 926                         ssif_info->got_alert = false;
 927                         ssif_info->waiting_alert = false;
 928                 }
 929
 930                 if (got_alert) {
 931                         ipmi_ssif_unlock_cond(ssif_info, flags);
 932                         /* The alert already happened, try now. */
 933                         retry_timeout((unsigned long) ssif_info);
 934                 } else {
 935                         /* Wait a jiffie then request the next message */
 936                         ssif_info->waiting_alert = true;
 937                         ssif_info->retries_left = SSIF_RECV_RETRIES;
 938                         ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC;
 939                         mod_timer(&ssif_info->retry_timer,
 940                                   jiffies + SSIF_MSG_PART_JIFFIES);
 941                         ipmi_ssif_unlock_cond(ssif_info, flags);
 942                 }
 943         }
 944 }
 945
 946 static int start_resend(struct ssif_info *ssif_info)
 947 {
 948         int rv;
 949         int command;
 950
 951         ssif_info->got_alert = false;
 952
 953         if (ssif_info->data_len > 32) {
 954                 command = SSIF_IPMI_MULTI_PART_REQUEST_START;
 955                 ssif_info->multi_data = ssif_info->data;
 956                 ssif_info->multi_len = ssif_info->data_len;
 957                 /*
 958                  * Subtle thing, this is 32, not 33, because we will
 959                  * overwrite the thing at position 32 (which was just
 960                  * transmitted) with the new length.
 961                  */
 962                 ssif_info->multi_pos = 32;
 963                 ssif_info->data[0] = 32;
 964         } else {
 965                 ssif_info->multi_data = NULL;
 966                 command = SSIF_IPMI_REQUEST;
 967                 ssif_info->data[0] = ssif_info->data_len;
 968         }
 969
 970         rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
 971                           command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
 972         if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG))
 973                 pr_info("Error from i2c_non_blocking_op(4)\n");
 974         return rv;
 975 }
 976
 977 static int start_send(struct ssif_info *ssif_info,
 978                       unsigned char   *data,
 979                       unsigned int    len)
 980 {
 981         if (len > IPMI_MAX_MSG_LENGTH)
 982                 return -E2BIG;
 983         if (len > ssif_info->max_xmit_msg_size)
 984                 return -E2BIG;
 985
 986         ssif_info->retries_left = SSIF_SEND_RETRIES;
 987         memcpy(ssif_info->data+1, data, len);
 988         ssif_info->data_len = len;
 989         return start_resend(ssif_info);
 990 }
 991
 992 /* Must be called with the message lock held. */
 993 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags)
 994 {
 995         struct ipmi_smi_msg *msg;
 996         unsigned long oflags;
 997
 998  restart:
 999         if (!SSIF_IDLE(ssif_info)) {
1000                 ipmi_ssif_unlock_cond(ssif_info, flags);
1001                 return;
1002         }
1003
1004         if (!ssif_info->waiting_msg) {
1005                 ssif_info->curr_msg = NULL;
1006                 ipmi_ssif_unlock_cond(ssif_info, flags);
1007         } else {
1008                 int rv;
1009
1010                 ssif_info->curr_msg = ssif_info->waiting_msg;
1011                 ssif_info->waiting_msg = NULL;
1012                 ipmi_ssif_unlock_cond(ssif_info, flags);
1013                 rv = start_send(ssif_info,
1014                                 ssif_info->curr_msg->data,
1015                                 ssif_info->curr_msg->data_size);
1016                 if (rv) {
1017                         msg = ssif_info->curr_msg;
1018                         ssif_info->curr_msg = NULL;
1019                         return_hosed_msg(ssif_info, msg);
1020                         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1021                         goto restart;
1022                 }
1023         }
1024 }
1025
1026 static void sender(void                *send_info,
1027                    struct ipmi_smi_msg *msg)
1028 {
1029         struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1030         unsigned long oflags, *flags;
1031
1032         BUG_ON(ssif_info->waiting_msg);
1033         ssif_info->waiting_msg = msg;
1034
1035         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1036         start_next_msg(ssif_info, flags);
1037
1038         if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) {
1039                 struct timeval t;
1040
1041                 do_gettimeofday(&t);
1042                 pr_info("**Enqueue %02x %02x: %ld.%6.6ld\n",
1043                        msg->data[0], msg->data[1],
1044                        (long) t.tv_sec, (long) t.tv_usec);
1045         }
1046 }
1047
1048 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1049 {
1050         struct ssif_info *ssif_info = send_info;
1051
1052         data->addr_src = ssif_info->addr_source;
1053         data->dev = &ssif_info->client->dev;
1054         data->addr_info = ssif_info->addr_info;
1055         get_device(data->dev);
1056
1057         return 0;
1058 }
1059
1060 /*
1061  * Instead of having our own timer to periodically check the message
1062  * flags, we let the message handler drive us.
1063  */
1064 static void request_events(void *send_info)
1065 {
1066         struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1067         unsigned long oflags, *flags;
1068
1069         if (!ssif_info->has_event_buffer)
1070                 return;
1071
1072         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1073         /*
1074          * Request flags first, not events, because the lower layer
1075          * doesn't have a way to send an attention.  But make sure
1076          * event checking still happens.
1077          */
1078         ssif_info->req_events = true;
1079         if (SSIF_IDLE(ssif_info))
1080                 start_flag_fetch(ssif_info, flags);
1081         else {
1082                 ssif_info->req_flags = true;
1083                 ipmi_ssif_unlock_cond(ssif_info, flags);
1084         }
1085 }
1086
1087 static int inc_usecount(void *send_info)
1088 {
1089         struct ssif_info *ssif_info = send_info;
1090
1091         if (!i2c_get_adapter(ssif_info->client->adapter->nr))
1092                 return -ENODEV;
1093
1094         i2c_use_client(ssif_info->client);
1095         return 0;
1096 }
1097
1098 static void dec_usecount(void *send_info)
1099 {
1100         struct ssif_info *ssif_info = send_info;
1101
1102         i2c_release_client(ssif_info->client);
1103         i2c_put_adapter(ssif_info->client->adapter);
1104 }
1105
1106 static int ssif_start_processing(void *send_info,
1107                                  ipmi_smi_t intf)
1108 {
1109         struct ssif_info *ssif_info = send_info;
1110
1111         ssif_info->intf = intf;
1112
1113         return 0;
1114 }
1115
1116 #define MAX_SSIF_BMCS 4
1117
1118 static unsigned short addr[MAX_SSIF_BMCS];
1119 static int num_addrs;
1120 module_param_array(addr, ushort, &num_addrs, 0);
1121 MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs.");
1122
1123 static char *adapter_name[MAX_SSIF_BMCS];
1124 static int num_adapter_names;
1125 module_param_array(adapter_name, charp, &num_adapter_names, 0);
1126 MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC.  By default all devices are scanned.");
1127
1128 static int slave_addrs[MAX_SSIF_BMCS];
1129 static int num_slave_addrs;
1130 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1131 MODULE_PARM_DESC(slave_addrs,
1132                  "The default IPMB slave address for the controller.");
1133
1134 /*
1135  * Bit 0 enables message debugging, bit 1 enables state debugging, and
1136  * bit 2 enables timing debugging.  This is an array indexed by
1137  * interface number"
1138  */
1139 static int dbg[MAX_SSIF_BMCS];
1140 static int num_dbg;
1141 module_param_array(dbg, int, &num_dbg, 0);
1142 MODULE_PARM_DESC(dbg, "Turn on debugging.");
1143
1144 static bool ssif_dbg_probe;
1145 module_param_named(dbg_probe, ssif_dbg_probe, bool, 0);
1146 MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters.");
1147
1148 static int use_thread;
1149 module_param(use_thread, int, 0);
1150 MODULE_PARM_DESC(use_thread, "Use the thread interface.");
1151
1152 static bool ssif_tryacpi = 1;
1153 module_param_named(tryacpi, ssif_tryacpi, bool, 0);
1154 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
1155
1156 static bool ssif_trydmi = 1;
1157 module_param_named(trydmi, ssif_trydmi, bool, 0);
1158 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
1159
1160 static DEFINE_MUTEX(ssif_infos_mutex);
1161 static LIST_HEAD(ssif_infos);
1162
1163 static int ssif_remove(struct i2c_client *client)
1164 {
1165         struct ssif_info *ssif_info = i2c_get_clientdata(client);
1166         int rv;
1167
1168         if (!ssif_info)
1169                 return 0;
1170
1171         /*
1172          * After this point, we won't deliver anything asychronously
1173          * to the message handler.  We can unregister ourself.
1174          */
1175         rv = ipmi_unregister_smi(ssif_info->intf);
1176         if (rv) {
1177                 pr_err(PFX "Unable to unregister device: errno=%d\n", rv);
1178                 return rv;
1179         }
1180         ssif_info->intf = NULL;
1181
1182         /* make sure the driver is not looking for flags any more. */
1183         while (ssif_info->ssif_state != SSIF_NORMAL)
1184                 schedule_timeout(1);
1185
1186         ssif_info->stopping = true;
1187         del_timer_sync(&ssif_info->retry_timer);
1188         if (ssif_info->thread) {
1189                 complete(&ssif_info->wake_thread);
1190                 kthread_stop(ssif_info->thread);
1191         }
1192
1193         /*
1194          * No message can be outstanding now, we have removed the
1195          * upper layer and it permitted us to do so.
1196          */
1197         kfree(ssif_info);
1198         return 0;
1199 }
1200
1201 static int do_cmd(struct i2c_client *client, int len, unsigned char *msg,
1202                   int *resp_len, unsigned char *resp)
1203 {
1204         int retry_cnt;
1205         int ret;
1206
1207         retry_cnt = SSIF_SEND_RETRIES;
1208  retry1:
1209         ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg);
1210         if (ret) {
1211                 retry_cnt--;
1212                 if (retry_cnt > 0)
1213                         goto retry1;
1214                 return -ENODEV;
1215         }
1216
1217         ret = -ENODEV;
1218         retry_cnt = SSIF_RECV_RETRIES;
1219         while (retry_cnt > 0) {
1220                 ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE,
1221                                                 resp);
1222                 if (ret > 0)
1223                         break;
1224                 msleep(SSIF_MSG_MSEC);
1225                 retry_cnt--;
1226                 if (retry_cnt <= 0)
1227                         break;
1228         }
1229
1230         if (ret > 0) {
1231                 /* Validate that the response is correct. */
1232                 if (ret < 3 ||
1233                     (resp[0] != (msg[0] | (1 << 2))) ||
1234                     (resp[1] != msg[1]))
1235                         ret = -EINVAL;
1236                 else {
1237                         *resp_len = ret;
1238                         ret = 0;
1239                 }
1240         }
1241
1242         return ret;
1243 }
1244
1245 static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
1246 {
1247         unsigned char *resp;
1248         unsigned char msg[3];
1249         int           rv;
1250         int           len;
1251
1252         resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1253         if (!resp)
1254                 return -ENOMEM;
1255
1256         /* Do a Get Device ID command, since it is required. */
1257         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1258         msg[1] = IPMI_GET_DEVICE_ID_CMD;
1259         rv = do_cmd(client, 2, msg, &len, resp);
1260         if (rv)
1261                 rv = -ENODEV;
1262         else
1263                 strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
1264         kfree(resp);
1265         return rv;
1266 }
1267
1268 static int smi_type_proc_show(struct seq_file *m, void *v)
1269 {
1270         seq_puts(m, "ssif\n");
1271
1272         return 0;
1273 }
1274
1275 static int smi_type_proc_open(struct inode *inode, struct file *file)
1276 {
1277         return single_open(file, smi_type_proc_show, inode->i_private);
1278 }
1279
1280 static const struct file_operations smi_type_proc_ops = {
1281         .open           = smi_type_proc_open,
1282         .read           = seq_read,
1283         .llseek         = seq_lseek,
1284         .release        = single_release,
1285 };
1286
1287 static int smi_stats_proc_show(struct seq_file *m, void *v)
1288 {
1289         struct ssif_info *ssif_info = m->private;
1290
1291         seq_printf(m, "sent_messages:          %u\n",
1292                    ssif_get_stat(ssif_info, sent_messages));
1293         seq_printf(m, "sent_messages_parts:    %u\n",
1294                    ssif_get_stat(ssif_info, sent_messages_parts));
1295         seq_printf(m, "send_retries:           %u\n",
1296                    ssif_get_stat(ssif_info, send_retries));
1297         seq_printf(m, "send_errors:            %u\n",
1298                    ssif_get_stat(ssif_info, send_errors));
1299         seq_printf(m, "received_messages:      %u\n",
1300                    ssif_get_stat(ssif_info, received_messages));
1301         seq_printf(m, "received_message_parts: %u\n",
1302                    ssif_get_stat(ssif_info, received_message_parts));
1303         seq_printf(m, "receive_retries:        %u\n",
1304                    ssif_get_stat(ssif_info, receive_retries));
1305         seq_printf(m, "receive_errors:         %u\n",
1306                    ssif_get_stat(ssif_info, receive_errors));
1307         seq_printf(m, "flag_fetches:           %u\n",
1308                    ssif_get_stat(ssif_info, flag_fetches));
1309         seq_printf(m, "hosed:                  %u\n",
1310                    ssif_get_stat(ssif_info, hosed));
1311         seq_printf(m, "events:                 %u\n",
1312                    ssif_get_stat(ssif_info, events));
1313         seq_printf(m, "watchdog_pretimeouts:   %u\n",
1314                    ssif_get_stat(ssif_info, watchdog_pretimeouts));
1315         seq_printf(m, "alerts:                 %u\n",
1316                    ssif_get_stat(ssif_info, alerts));
1317         return 0;
1318 }
1319
1320 static int smi_stats_proc_open(struct inode *inode, struct file *file)
1321 {
1322         return single_open(file, smi_stats_proc_show, PDE_DATA(inode));
1323 }
1324
1325 static const struct file_operations smi_stats_proc_ops = {
1326         .open           = smi_stats_proc_open,
1327         .read           = seq_read,
1328         .llseek         = seq_lseek,
1329         .release        = single_release,
1330 };
1331
1332 static int strcmp_nospace(char *s1, char *s2)
1333 {
1334         while (*s1 && *s2) {
1335                 while (isspace(*s1))
1336                         s1++;
1337                 while (isspace(*s2))
1338                         s2++;
1339                 if (*s1 > *s2)
1340                         return 1;
1341                 if (*s1 < *s2)
1342                         return -1;
1343                 s1++;
1344                 s2++;
1345         }
1346         return 0;
1347 }
1348
1349 static struct ssif_addr_info *ssif_info_find(unsigned short addr,
1350                                              char *adapter_name,
1351                                              bool match_null_name)
1352 {
1353         struct ssif_addr_info *info, *found = NULL;
1354
1355 restart:
1356         list_for_each_entry(info, &ssif_infos, link) {
1357                 if (info->binfo.addr == addr) {
1358                         if (info->adapter_name || adapter_name) {
1359                                 if (!info->adapter_name != !adapter_name) {
1360                                         /* One is NULL and one is not */
1361                                         continue;
1362                                 }
1363                                 if (adapter_name &&
1364                                     strcmp_nospace(info->adapter_name,
1365                                                    adapter_name))
1366                                         /* Names do not match */
1367                                         continue;
1368                         }
1369                         found = info;
1370                         break;
1371                 }
1372         }
1373
1374         if (!found && match_null_name) {
1375                 /* Try to get an exact match first, then try with a NULL name */
1376                 adapter_name = NULL;
1377                 match_null_name = false;
1378                 goto restart;
1379         }
1380
1381         return found;
1382 }
1383
1384 static bool check_acpi(struct ssif_info *ssif_info, struct device *dev)
1385 {
1386 #ifdef CONFIG_ACPI
1387         acpi_handle acpi_handle;
1388
1389         acpi_handle = ACPI_HANDLE(dev);
1390         if (acpi_handle) {
1391                 ssif_info->addr_source = SI_ACPI;
1392                 ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle;
1393                 return true;
1394         }
1395 #endif
1396         return false;
1397 }
1398
1399 /*
1400  * Global enables we care about.
1401  */
1402 #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
1403                              IPMI_BMC_EVT_MSG_INTR)
1404
1405 static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
1406 {
1407         unsigned char     msg[3];
1408         unsigned char     *resp;
1409         struct ssif_info   *ssif_info;
1410         int               rv = 0;
1411         int               len;
1412         int               i;
1413         u8                slave_addr = 0;
1414         struct ssif_addr_info *addr_info = NULL;
1415
1416
1417         resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1418         if (!resp)
1419                 return -ENOMEM;
1420
1421         ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
1422         if (!ssif_info) {
1423                 kfree(resp);
1424                 return -ENOMEM;
1425         }
1426
1427         if (!check_acpi(ssif_info, &client->dev)) {
1428                 addr_info = ssif_info_find(client->addr, client->adapter->name,
1429                                            true);
1430                 if (!addr_info) {
1431                         /* Must have come in through sysfs. */
1432                         ssif_info->addr_source = SI_HOTMOD;
1433                 } else {
1434                         ssif_info->addr_source = addr_info->addr_src;
1435                         ssif_info->ssif_debug = addr_info->debug;
1436                         ssif_info->addr_info = addr_info->addr_info;
1437                         slave_addr = addr_info->slave_addr;
1438                 }
1439         }
1440
1441         pr_info(PFX "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
1442                ipmi_addr_src_to_str(ssif_info->addr_source),
1443                client->addr, client->adapter->name, slave_addr);
1444
1445         /*
1446          * Do a Get Device ID command, since it comes back with some
1447          * useful info.
1448          */
1449         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1450         msg[1] = IPMI_GET_DEVICE_ID_CMD;
1451         rv = do_cmd(client, 2, msg, &len, resp);
1452         if (rv)
1453                 goto out;
1454
1455         rv = ipmi_demangle_device_id(resp, len, &ssif_info->device_id);
1456         if (rv)
1457                 goto out;
1458
1459         ssif_info->client = client;
1460         i2c_set_clientdata(client, ssif_info);
1461
1462         /* Now check for system interface capabilities */
1463         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1464         msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
1465         msg[2] = 0; /* SSIF */
1466         rv = do_cmd(client, 3, msg, &len, resp);
1467         if (!rv && (len >= 3) && (resp[2] == 0)) {
1468                 if (len < 7) {
1469                         if (ssif_dbg_probe)
1470                                 pr_info(PFX "SSIF info too short: %d\n", len);
1471                         goto no_support;
1472                 }
1473
1474                 /* Got a good SSIF response, handle it. */
1475                 ssif_info->max_xmit_msg_size = resp[5];
1476                 ssif_info->max_recv_msg_size = resp[6];
1477                 ssif_info->multi_support = (resp[4] >> 6) & 0x3;
1478                 ssif_info->supports_pec = (resp[4] >> 3) & 0x1;
1479
1480                 /* Sanitize the data */
1481                 switch (ssif_info->multi_support) {
1482                 case SSIF_NO_MULTI:
1483                         if (ssif_info->max_xmit_msg_size > 32)
1484                                 ssif_info->max_xmit_msg_size = 32;
1485                         if (ssif_info->max_recv_msg_size > 32)
1486                                 ssif_info->max_recv_msg_size = 32;
1487                         break;
1488
1489                 case SSIF_MULTI_2_PART:
1490                         if (ssif_info->max_xmit_msg_size > 64)
1491                                 ssif_info->max_xmit_msg_size = 64;
1492                         if (ssif_info->max_recv_msg_size > 62)
1493                                 ssif_info->max_recv_msg_size = 62;
1494                         break;
1495
1496                 case SSIF_MULTI_n_PART:
1497                         break;
1498
1499                 default:
1500                         /* Data is not sane, just give up. */
1501                         goto no_support;
1502                 }
1503         } else {
1504  no_support:
1505                 /* Assume no multi-part or PEC support */
1506                 pr_info(PFX "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
1507                        rv, len, resp[2]);
1508
1509                 ssif_info->max_xmit_msg_size = 32;
1510                 ssif_info->max_recv_msg_size = 32;
1511                 ssif_info->multi_support = SSIF_NO_MULTI;
1512                 ssif_info->supports_pec = 0;
1513         }
1514
1515         /* Make sure the NMI timeout is cleared. */
1516         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1517         msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
1518         msg[2] = WDT_PRE_TIMEOUT_INT;
1519         rv = do_cmd(client, 3, msg, &len, resp);
1520         if (rv || (len < 3) || (resp[2] != 0))
1521                 pr_warn(PFX "Unable to clear message flags: %d %d %2.2x\n",
1522                         rv, len, resp[2]);
1523
1524         /* Attempt to enable the event buffer. */
1525         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1526         msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
1527         rv = do_cmd(client, 2, msg, &len, resp);
1528         if (rv || (len < 4) || (resp[2] != 0)) {
1529                 pr_warn(PFX "Error getting global enables: %d %d %2.2x\n",
1530                         rv, len, resp[2]);
1531                 rv = 0; /* Not fatal */
1532                 goto found;
1533         }
1534
1535         ssif_info->global_enables = resp[3];
1536
1537         if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
1538                 ssif_info->has_event_buffer = true;
1539                 /* buffer is already enabled, nothing to do. */
1540                 goto found;
1541         }
1542
1543         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1544         msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1545         msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF;
1546         rv = do_cmd(client, 3, msg, &len, resp);
1547         if (rv || (len < 2)) {
1548                 pr_warn(PFX "Error setting global enables: %d %d %2.2x\n",
1549                         rv, len, resp[2]);
1550                 rv = 0; /* Not fatal */
1551                 goto found;
1552         }
1553
1554         if (resp[2] == 0) {
1555                 /* A successful return means the event buffer is supported. */
1556                 ssif_info->has_event_buffer = true;
1557                 ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF;
1558         }
1559
1560         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1561         msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1562         msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR;
1563         rv = do_cmd(client, 3, msg, &len, resp);
1564         if (rv || (len < 2)) {
1565                 pr_warn(PFX "Error setting global enables: %d %d %2.2x\n",
1566                         rv, len, resp[2]);
1567                 rv = 0; /* Not fatal */
1568                 goto found;
1569         }
1570
1571         if (resp[2] == 0) {
1572                 /* A successful return means the alert is supported. */
1573                 ssif_info->supports_alert = true;
1574                 ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR;
1575         }
1576
1577  found:
1578         ssif_info->intf_num = atomic_inc_return(&next_intf);
1579
1580         if (ssif_dbg_probe) {
1581                 pr_info("ssif_probe: i2c_probe found device at i2c address %x\n",
1582                         client->addr);
1583         }
1584
1585         spin_lock_init(&ssif_info->lock);
1586         ssif_info->ssif_state = SSIF_NORMAL;
1587         init_timer(&ssif_info->retry_timer);
1588         ssif_info->retry_timer.data = (unsigned long) ssif_info;
1589         ssif_info->retry_timer.function = retry_timeout;
1590
1591         for (i = 0; i < SSIF_NUM_STATS; i++)
1592                 atomic_set(&ssif_info->stats[i], 0);
1593
1594         if (ssif_info->supports_pec)
1595                 ssif_info->client->flags |= I2C_CLIENT_PEC;
1596
1597         ssif_info->handlers.owner = THIS_MODULE;
1598         ssif_info->handlers.start_processing = ssif_start_processing;
1599         ssif_info->handlers.get_smi_info = get_smi_info;
1600         ssif_info->handlers.sender = sender;
1601         ssif_info->handlers.request_events = request_events;
1602         ssif_info->handlers.inc_usecount = inc_usecount;
1603         ssif_info->handlers.dec_usecount = dec_usecount;
1604
1605         {
1606                 unsigned int thread_num;
1607
1608                 thread_num = ((ssif_info->client->adapter->nr << 8) |
1609                               ssif_info->client->addr);
1610                 init_completion(&ssif_info->wake_thread);
1611                 ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info,
1612                                                "kssif%4.4x", thread_num);
1613                 if (IS_ERR(ssif_info->thread)) {
1614                         rv = PTR_ERR(ssif_info->thread);
1615                         dev_notice(&ssif_info->client->dev,
1616                                    "Could not start kernel thread: error %d\n",
1617                                    rv);
1618                         goto out;
1619                 }
1620         }
1621
1622         rv = ipmi_register_smi(&ssif_info->handlers,
1623                                ssif_info,
1624                                &ssif_info->device_id,
1625                                &ssif_info->client->dev,
1626                                slave_addr);
1627          if (rv) {
1628                 pr_err(PFX "Unable to register device: error %d\n", rv);
1629                 goto out;
1630         }
1631
1632         rv = ipmi_smi_add_proc_entry(ssif_info->intf, "type",
1633                                      &smi_type_proc_ops,
1634                                      ssif_info);
1635         if (rv) {
1636                 pr_err(PFX "Unable to create proc entry: %d\n", rv);
1637                 goto out_err_unreg;
1638         }
1639
1640         rv = ipmi_smi_add_proc_entry(ssif_info->intf, "ssif_stats",
1641                                      &smi_stats_proc_ops,
1642                                      ssif_info);
1643         if (rv) {
1644                 pr_err(PFX "Unable to create proc entry: %d\n", rv);
1645                 goto out_err_unreg;
1646         }
1647
1648  out:
1649         if (rv)
1650                 kfree(ssif_info);
1651         kfree(resp);
1652         return rv;
1653
1654  out_err_unreg:
1655         ipmi_unregister_smi(ssif_info->intf);
1656         goto out;
1657 }
1658
1659 static int ssif_adapter_handler(struct device *adev, void *opaque)
1660 {
1661         struct ssif_addr_info *addr_info = opaque;
1662
1663         if (adev->type != &i2c_adapter_type)
1664                 return 0;
1665
1666         i2c_new_device(to_i2c_adapter(adev), &addr_info->binfo);
1667
1668         if (!addr_info->adapter_name)
1669                 return 1; /* Only try the first I2C adapter by default. */
1670         return 0;
1671 }
1672
1673 static int new_ssif_client(int addr, char *adapter_name,
1674                            int debug, int slave_addr,
1675                            enum ipmi_addr_src addr_src)
1676 {
1677         struct ssif_addr_info *addr_info;
1678         int rv = 0;
1679
1680         mutex_lock(&ssif_infos_mutex);
1681         if (ssif_info_find(addr, adapter_name, false)) {
1682                 rv = -EEXIST;
1683                 goto out_unlock;
1684         }
1685
1686         addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL);
1687         if (!addr_info) {
1688                 rv = -ENOMEM;
1689                 goto out_unlock;
1690         }
1691
1692         if (adapter_name) {
1693                 addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL);
1694                 if (!addr_info->adapter_name) {
1695                         kfree(addr_info);
1696                         rv = -ENOMEM;
1697                         goto out_unlock;
1698                 }
1699         }
1700
1701         strncpy(addr_info->binfo.type, DEVICE_NAME,
1702                 sizeof(addr_info->binfo.type));
1703         addr_info->binfo.addr = addr;
1704         addr_info->binfo.platform_data = addr_info;
1705         addr_info->debug = debug;
1706         addr_info->slave_addr = slave_addr;
1707         addr_info->addr_src = addr_src;
1708
1709         list_add_tail(&addr_info->link, &ssif_infos);
1710
1711         if (initialized)
1712                 i2c_for_each_dev(addr_info, ssif_adapter_handler);
1713         /* Otherwise address list will get it */
1714
1715 out_unlock:
1716         mutex_unlock(&ssif_infos_mutex);
1717         return rv;
1718 }
1719
1720 static void free_ssif_clients(void)
1721 {
1722         struct ssif_addr_info *info, *tmp;
1723
1724         mutex_lock(&ssif_infos_mutex);
1725         list_for_each_entry_safe(info, tmp, &ssif_infos, link) {
1726                 list_del(&info->link);
1727                 kfree(info->adapter_name);
1728                 kfree(info);
1729         }
1730         mutex_unlock(&ssif_infos_mutex);
1731 }
1732
1733 static unsigned short *ssif_address_list(void)
1734 {
1735         struct ssif_addr_info *info;
1736         unsigned int count = 0, i;
1737         unsigned short *address_list;
1738
1739         list_for_each_entry(info, &ssif_infos, link)
1740                 count++;
1741
1742         address_list = kzalloc(sizeof(*address_list) * (count + 1), GFP_KERNEL);
1743         if (!address_list)
1744                 return NULL;
1745
1746         i = 0;
1747         list_for_each_entry(info, &ssif_infos, link) {
1748                 unsigned short addr = info->binfo.addr;
1749                 int j;
1750
1751                 for (j = 0; j < i; j++) {
1752                         if (address_list[j] == addr)
1753                                 goto skip_addr;
1754                 }
1755                 address_list[i] = addr;
1756 skip_addr:
1757                 i++;
1758         }
1759         address_list[i] = I2C_CLIENT_END;
1760
1761         return address_list;
1762 }
1763
1764 #ifdef CONFIG_ACPI
1765 static struct acpi_device_id ssif_acpi_match[] = {
1766         { "IPI0001", 0 },
1767         { },
1768 };
1769 MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
1770
1771 /*
1772  * Once we get an ACPI failure, we don't try any more, because we go
1773  * through the tables sequentially.  Once we don't find a table, there
1774  * are no more.
1775  */
1776 static int acpi_failure;
1777
1778 /*
1779  * Defined in the IPMI 2.0 spec.
1780  */
1781 struct SPMITable {
1782         s8      Signature[4];
1783         u32     Length;
1784         u8      Revision;
1785         u8      Checksum;
1786         s8      OEMID[6];
1787         s8      OEMTableID[8];
1788         s8      OEMRevision[4];
1789         s8      CreatorID[4];
1790         s8      CreatorRevision[4];
1791         u8      InterfaceType;
1792         u8      IPMIlegacy;
1793         s16     SpecificationRevision;
1794
1795         /*
1796          * Bit 0 - SCI interrupt supported
1797          * Bit 1 - I/O APIC/SAPIC
1798          */
1799         u8      InterruptType;
1800
1801         /*
1802          * If bit 0 of InterruptType is set, then this is the SCI
1803          * interrupt in the GPEx_STS register.
1804          */
1805         u8      GPE;
1806
1807         s16     Reserved;
1808
1809         /*
1810          * If bit 1 of InterruptType is set, then this is the I/O
1811          * APIC/SAPIC interrupt.
1812          */
1813         u32     GlobalSystemInterrupt;
1814
1815         /* The actual register address. */
1816         struct acpi_generic_address addr;
1817
1818         u8      UID[4];
1819
1820         s8      spmi_id[1]; /* A '\0' terminated array starts here. */
1821 };
1822
1823 static int try_init_spmi(struct SPMITable *spmi)
1824 {
1825         unsigned short myaddr;
1826
1827         if (num_addrs >= MAX_SSIF_BMCS)
1828                 return -1;
1829
1830         if (spmi->IPMIlegacy != 1) {
1831                 pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy);
1832                 return -ENODEV;
1833         }
1834
1835         if (spmi->InterfaceType != 4)
1836                 return -ENODEV;
1837
1838         if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) {
1839                 pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n",
1840                         spmi->addr.space_id);
1841                 return -EIO;
1842         }
1843
1844         myaddr = spmi->addr.address >> 1;
1845
1846         return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI);
1847 }
1848
1849 static void spmi_find_bmc(void)
1850 {
1851         acpi_status      status;
1852         struct SPMITable *spmi;
1853         int              i;
1854
1855         if (acpi_disabled)
1856                 return;
1857
1858         if (acpi_failure)
1859                 return;
1860
1861         for (i = 0; ; i++) {
1862                 status = acpi_get_table(ACPI_SIG_SPMI, i+1,
1863                                         (struct acpi_table_header **)&spmi);
1864                 if (status != AE_OK)
1865                         return;
1866
1867                 try_init_spmi(spmi);
1868         }
1869 }
1870 #else
1871 static void spmi_find_bmc(void) { }
1872 #endif
1873
1874 #ifdef CONFIG_DMI
1875 static int decode_dmi(const struct dmi_device *dmi_dev)
1876 {
1877         struct dmi_header *dm = dmi_dev->device_data;
1878         u8             *data = (u8 *) dm;
1879         u8             len = dm->length;
1880         unsigned short myaddr;
1881         int            slave_addr;
1882
1883         if (num_addrs >= MAX_SSIF_BMCS)
1884                 return -1;
1885
1886         if (len < 9)
1887                 return -1;
1888
1889         if (data[0x04] != 4) /* Not SSIF */
1890                 return -1;
1891
1892         if ((data[8] >> 1) == 0) {
1893                 /*
1894                  * Some broken systems put the I2C address in
1895                  * the slave address field.  We try to
1896                  * accommodate them here.
1897                  */
1898                 myaddr = data[6] >> 1;
1899                 slave_addr = 0;
1900         } else {
1901                 myaddr = data[8] >> 1;
1902                 slave_addr = data[6];
1903         }
1904
1905         return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS);
1906 }
1907
1908 static void dmi_iterator(void)
1909 {
1910         const struct dmi_device *dev = NULL;
1911
1912         while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
1913                 decode_dmi(dev);
1914 }
1915 #else
1916 static void dmi_iterator(void) { }
1917 #endif
1918
1919 static const struct i2c_device_id ssif_id[] = {
1920         { DEVICE_NAME, 0 },
1921         { }
1922 };
1923 MODULE_DEVICE_TABLE(i2c, ssif_id);
1924
1925 static struct i2c_driver ssif_i2c_driver = {
1926         .class          = I2C_CLASS_HWMON,
1927         .driver         = {
1928                 .owner                  = THIS_MODULE,
1929                 .name                   = DEVICE_NAME
1930         },
1931         .probe          = ssif_probe,
1932         .remove         = ssif_remove,
1933         .alert          = ssif_alert,
1934         .id_table       = ssif_id,
1935         .detect         = ssif_detect
1936 };
1937
1938 static int init_ipmi_ssif(void)
1939 {
1940         int i;
1941         int rv;
1942
1943         if (initialized)
1944                 return 0;
1945
1946         pr_info("IPMI SSIF Interface driver\n");
1947
1948         /* build list for i2c from addr list */
1949         for (i = 0; i < num_addrs; i++) {
1950                 rv = new_ssif_client(addr[i], adapter_name[i],
1951                                      dbg[i], slave_addrs[i],
1952                                      SI_HARDCODED);
1953                 if (rv)
1954                         pr_err(PFX
1955                                "Couldn't add hardcoded device at addr 0x%x\n",
1956                                addr[i]);
1957         }
1958
1959         if (ssif_tryacpi)
1960                 ssif_i2c_driver.driver.acpi_match_table =
1961                         ACPI_PTR(ssif_acpi_match);
1962         if (ssif_trydmi)
1963                 dmi_iterator();
1964         if (ssif_tryacpi)
1965                 spmi_find_bmc();
1966
1967         ssif_i2c_driver.address_list = ssif_address_list();
1968
1969         rv = i2c_add_driver(&ssif_i2c_driver);
1970         if (!rv)
1971                 initialized = true;
1972
1973         return rv;
1974 }
1975 module_init(init_ipmi_ssif);
1976
1977 static void cleanup_ipmi_ssif(void)
1978 {
1979         if (!initialized)
1980                 return;
1981
1982         initialized = false;
1983
1984         i2c_del_driver(&ssif_i2c_driver);
1985
1986         free_ssif_clients();
1987 }
1988 module_exit(cleanup_ipmi_ssif);
1989
1990 MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
1991 MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
1992 MODULE_LICENSE("GPL");