kernel/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_info->i2c_command,
 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_info->i2c_command,
 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         ssif_info->multi_pos = 0;
 538
 539         rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
 540                           SSIF_IPMI_RESPONSE,
 541                           ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
 542         if (rv < 0) {
 543                 /* request failed, just return the error. */
 544                 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 545                         pr_info("Error from i2c_non_blocking_op(5)\n");
 546
 547                 msg_done_handler(ssif_info, -EIO, NULL, 0);
 548         }
 549 }
 550
 551 static void retry_timeout(unsigned long data)
 552 {
 553         struct ssif_info *ssif_info = (void *) data;
 554         unsigned long oflags, *flags;
 555         bool waiting;
 556
 557         if (ssif_info->stopping)
 558                 return;
 559
 560         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 561         waiting = ssif_info->waiting_alert;
 562         ssif_info->waiting_alert = false;
 563         ipmi_ssif_unlock_cond(ssif_info, flags);
 564
 565         if (waiting)
 566                 start_get(ssif_info);
 567 }
 568
 569
 570 static void ssif_alert(struct i2c_client *client, unsigned int data)
 571 {
 572         struct ssif_info *ssif_info = i2c_get_clientdata(client);
 573         unsigned long oflags, *flags;
 574         bool do_get = false;
 575
 576         ssif_inc_stat(ssif_info, alerts);
 577
 578         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 579         if (ssif_info->waiting_alert) {
 580                 ssif_info->waiting_alert = false;
 581                 del_timer(&ssif_info->retry_timer);
 582                 do_get = true;
 583         } else if (ssif_info->curr_msg) {
 584                 ssif_info->got_alert = true;
 585         }
 586         ipmi_ssif_unlock_cond(ssif_info, flags);
 587         if (do_get)
 588                 start_get(ssif_info);
 589 }
 590
 591 static int start_resend(struct ssif_info *ssif_info);
 592
 593 static void msg_done_handler(struct ssif_info *ssif_info, int result,
 594                              unsigned char *data, unsigned int len)
 595 {
 596         struct ipmi_smi_msg *msg;
 597         unsigned long oflags, *flags;
 598         int rv;
 599
 600         /*
 601          * We are single-threaded here, so no need for a lock until we
 602          * start messing with driver states or the queues.
 603          */
 604
 605         if (result < 0) {
 606                 ssif_info->retries_left--;
 607                 if (ssif_info->retries_left > 0) {
 608                         ssif_inc_stat(ssif_info, receive_retries);
 609
 610                         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 611                         ssif_info->waiting_alert = true;
 612                         ssif_info->rtc_us_timer = SSIF_MSG_USEC;
 613                         mod_timer(&ssif_info->retry_timer,
 614                                   jiffies + SSIF_MSG_JIFFIES);
 615                         ipmi_ssif_unlock_cond(ssif_info, flags);
 616                         return;
 617                 }
 618
 619                 ssif_inc_stat(ssif_info, receive_errors);
 620
 621                 if  (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 622                         pr_info("Error in msg_done_handler: %d\n", result);
 623                 len = 0;
 624                 goto continue_op;
 625         }
 626
 627         if ((len > 1) && (ssif_info->multi_pos == 0)
 628                                 && (data[0] == 0x00) && (data[1] == 0x01)) {
 629                 /* Start of multi-part read.  Start the next transaction. */
 630                 int i;
 631
 632                 ssif_inc_stat(ssif_info, received_message_parts);
 633
 634                 /* Remove the multi-part read marker. */
 635                 len -= 2;
 636                 for (i = 0; i < len; i++)
 637                         ssif_info->data[i] = data[i+2];
 638                 ssif_info->multi_len = len;
 639                 ssif_info->multi_pos = 1;
 640
 641                 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
 642                                   SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
 643                                   ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
 644                 if (rv < 0) {
 645                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 646                                 pr_info("Error from i2c_non_blocking_op(1)\n");
 647
 648                         result = -EIO;
 649                 } else
 650                         return;
 651         } else if (ssif_info->multi_pos) {
 652                 /* Middle of multi-part read.  Start the next transaction. */
 653                 int i;
 654                 unsigned char blocknum;
 655
 656                 if (len == 0) {
 657                         result = -EIO;
 658                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 659                                 pr_info(PFX "Middle message with no data\n");
 660
 661                         goto continue_op;
 662                 }
 663
 664                 blocknum = data[0];
 665
 666                 if (ssif_info->multi_len + len - 1 > IPMI_MAX_MSG_LENGTH) {
 667                         /* Received message too big, abort the operation. */
 668                         result = -E2BIG;
 669                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 670                                 pr_info("Received message too big\n");
 671
 672                         goto continue_op;
 673                 }
 674
 675                 /* Remove the blocknum from the data. */
 676                 len--;
 677                 for (i = 0; i < len; i++)
 678                         ssif_info->data[i + ssif_info->multi_len] = data[i + 1];
 679                 ssif_info->multi_len += len;
 680                 if (blocknum == 0xff) {
 681                         /* End of read */
 682                         len = ssif_info->multi_len;
 683                         data = ssif_info->data;
 684                 } else if (blocknum + 1 != ssif_info->multi_pos) {
 685                         /*
 686                          * Out of sequence block, just abort.  Block
 687                          * numbers start at zero for the second block,
 688                          * but multi_pos starts at one, so the +1.
 689                          */
 690                         result = -EIO;
 691                 } else {
 692                         ssif_inc_stat(ssif_info, received_message_parts);
 693
 694                         ssif_info->multi_pos++;
 695
 696                         rv = ssif_i2c_send(ssif_info, msg_done_handler,
 697                                            I2C_SMBUS_READ,
 698                                            SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
 699                                            ssif_info->recv,
 700                                            I2C_SMBUS_BLOCK_DATA);
 701                         if (rv < 0) {
 702                                 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 703                                         pr_info(PFX
 704                                                 "Error from ssif_i2c_send\n");
 705
 706                                 result = -EIO;
 707                         } else
 708                                 return;
 709                 }
 710         }
 711
 712         if (result < 0) {
 713                 ssif_inc_stat(ssif_info, receive_errors);
 714         } else {
 715                 ssif_inc_stat(ssif_info, received_messages);
 716                 ssif_inc_stat(ssif_info, received_message_parts);
 717         }
 718
 719
 720  continue_op:
 721         if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
 722                 pr_info(PFX "DONE 1: state = %d, result=%d.\n",
 723                         ssif_info->ssif_state, result);
 724
 725         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 726         msg = ssif_info->curr_msg;
 727         if (msg) {
 728                 msg->rsp_size = len;
 729                 if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
 730                         msg->rsp_size = IPMI_MAX_MSG_LENGTH;
 731                 memcpy(msg->rsp, data, msg->rsp_size);
 732                 ssif_info->curr_msg = NULL;
 733         }
 734
 735         switch (ssif_info->ssif_state) {
 736         case SSIF_NORMAL:
 737                 ipmi_ssif_unlock_cond(ssif_info, flags);
 738                 if (!msg)
 739                         break;
 740
 741                 if (result < 0)
 742                         return_hosed_msg(ssif_info, msg);
 743                 else
 744                         deliver_recv_msg(ssif_info, msg);
 745                 break;
 746
 747         case SSIF_GETTING_FLAGS:
 748                 /* We got the flags from the SSIF, now handle them. */
 749                 if ((result < 0) || (len < 4) || (data[2] != 0)) {
 750                         /*
 751                          * Error fetching flags, or invalid length,
 752                          * just give up for now.
 753                          */
 754                         ssif_info->ssif_state = SSIF_NORMAL;
 755                         ipmi_ssif_unlock_cond(ssif_info, flags);
 756                         pr_warn(PFX "Error getting flags: %d %d, %x\n",
 757                                result, len, data[2]);
 758                 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 759                            || data[1] != IPMI_GET_MSG_FLAGS_CMD) {
 760                         pr_warn(PFX "Invalid response getting flags: %x %x\n",
 761                                 data[0], data[1]);
 762                 } else {
 763                         ssif_inc_stat(ssif_info, flag_fetches);
 764                         ssif_info->msg_flags = data[3];
 765                         handle_flags(ssif_info, flags);
 766                 }
 767                 break;
 768
 769         case SSIF_CLEARING_FLAGS:
 770                 /* We cleared the flags. */
 771                 if ((result < 0) || (len < 3) || (data[2] != 0)) {
 772                         /* Error clearing flags */
 773                         pr_warn(PFX "Error clearing flags: %d %d, %x\n",
 774                                result, len, data[2]);
 775                 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 776                            || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) {
 777                         pr_warn(PFX "Invalid response clearing flags: %x %x\n",
 778                                 data[0], data[1]);
 779                 }
 780                 ssif_info->ssif_state = SSIF_NORMAL;
 781                 ipmi_ssif_unlock_cond(ssif_info, flags);
 782                 break;
 783
 784         case SSIF_GETTING_EVENTS:
 785                 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
 786                         /* Error getting event, probably done. */
 787                         msg->done(msg);
 788
 789                         /* Take off the event flag. */
 790                         ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
 791                         handle_flags(ssif_info, flags);
 792                 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 793                            || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) {
 794                         pr_warn(PFX "Invalid response getting events: %x %x\n",
 795                                 msg->rsp[0], msg->rsp[1]);
 796                         msg->done(msg);
 797                         /* Take off the event flag. */
 798                         ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
 799                         handle_flags(ssif_info, flags);
 800                 } else {
 801                         handle_flags(ssif_info, flags);
 802                         ssif_inc_stat(ssif_info, events);
 803                         deliver_recv_msg(ssif_info, msg);
 804                 }
 805                 break;
 806
 807         case SSIF_GETTING_MESSAGES:
 808                 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
 809                         /* Error getting event, probably done. */
 810                         msg->done(msg);
 811
 812                         /* Take off the msg flag. */
 813                         ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
 814                         handle_flags(ssif_info, flags);
 815                 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 816                            || msg->rsp[1] != IPMI_GET_MSG_CMD) {
 817                         pr_warn(PFX "Invalid response clearing flags: %x %x\n",
 818                                 msg->rsp[0], msg->rsp[1]);
 819                         msg->done(msg);
 820
 821                         /* Take off the msg flag. */
 822                         ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
 823                         handle_flags(ssif_info, flags);
 824                 } else {
 825                         ssif_inc_stat(ssif_info, incoming_messages);
 826                         handle_flags(ssif_info, flags);
 827                         deliver_recv_msg(ssif_info, msg);
 828                 }
 829                 break;
 830         }
 831
 832         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 833         if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) {
 834                 if (ssif_info->req_events)
 835                         start_event_fetch(ssif_info, flags);
 836                 else if (ssif_info->req_flags)
 837                         start_flag_fetch(ssif_info, flags);
 838                 else
 839                         start_next_msg(ssif_info, flags);
 840         } else
 841                 ipmi_ssif_unlock_cond(ssif_info, flags);
 842
 843         if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
 844                 pr_info(PFX "DONE 2: state = %d.\n", ssif_info->ssif_state);
 845 }
 846
 847 static void msg_written_handler(struct ssif_info *ssif_info, int result,
 848                                 unsigned char *data, unsigned int len)
 849 {
 850         int rv;
 851
 852         /* We are single-threaded here, so no need for a lock. */
 853         if (result < 0) {
 854                 ssif_info->retries_left--;
 855                 if (ssif_info->retries_left > 0) {
 856                         if (!start_resend(ssif_info)) {
 857                                 ssif_inc_stat(ssif_info, send_retries);
 858                                 return;
 859                         }
 860                         /* request failed, just return the error. */
 861                         ssif_inc_stat(ssif_info, send_errors);
 862
 863                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 864                                 pr_info(PFX
 865                                         "Out of retries in msg_written_handler\n");
 866                         msg_done_handler(ssif_info, -EIO, NULL, 0);
 867                         return;
 868                 }
 869
 870                 ssif_inc_stat(ssif_info, send_errors);
 871
 872                 /*
 873                  * Got an error on transmit, let the done routine
 874                  * handle it.
 875                  */
 876                 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 877                         pr_info("Error in msg_written_handler: %d\n", result);
 878
 879                 msg_done_handler(ssif_info, result, NULL, 0);
 880                 return;
 881         }
 882
 883         if (ssif_info->multi_data) {
 884                 /*
 885                  * In the middle of a multi-data write.  See the comment
 886                  * in the SSIF_MULTI_n_PART case in the probe function
 887                  * for details on the intricacies of this.
 888                  */
 889                 int left;
 890
 891                 ssif_inc_stat(ssif_info, sent_messages_parts);
 892
 893                 left = ssif_info->multi_len - ssif_info->multi_pos;
 894                 if (left > 32)
 895                         left = 32;
 896                 /* Length byte. */
 897                 ssif_info->multi_data[ssif_info->multi_pos] = left;
 898                 ssif_info->multi_pos += left;
 899                 if (left < 32)
 900                         /*
 901                          * Write is finished.  Note that we must end
 902                          * with a write of less than 32 bytes to
 903                          * complete the transaction, even if it is
 904                          * zero bytes.
 905                          */
 906                         ssif_info->multi_data = NULL;
 907
 908                 rv = ssif_i2c_send(ssif_info, msg_written_handler,
 909                                   I2C_SMBUS_WRITE,
 910                                   SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
 911                                   ssif_info->multi_data + ssif_info->multi_pos,
 912                                   I2C_SMBUS_BLOCK_DATA);
 913                 if (rv < 0) {
 914                         /* request failed, just return the error. */
 915                         ssif_inc_stat(ssif_info, send_errors);
 916
 917                         if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
 918                                 pr_info("Error from i2c_non_blocking_op(3)\n");
 919                         msg_done_handler(ssif_info, -EIO, NULL, 0);
 920                 }
 921         } else {
 922                 unsigned long oflags, *flags;
 923                 bool got_alert;
 924
 925                 ssif_inc_stat(ssif_info, sent_messages);
 926                 ssif_inc_stat(ssif_info, sent_messages_parts);
 927
 928                 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
 929                 got_alert = ssif_info->got_alert;
 930                 if (got_alert) {
 931                         ssif_info->got_alert = false;
 932                         ssif_info->waiting_alert = false;
 933                 }
 934
 935                 if (got_alert) {
 936                         ipmi_ssif_unlock_cond(ssif_info, flags);
 937                         /* The alert already happened, try now. */
 938                         retry_timeout((unsigned long) ssif_info);
 939                 } else {
 940                         /* Wait a jiffie then request the next message */
 941                         ssif_info->waiting_alert = true;
 942                         ssif_info->retries_left = SSIF_RECV_RETRIES;
 943                         ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC;
 944                         mod_timer(&ssif_info->retry_timer,
 945                                   jiffies + SSIF_MSG_PART_JIFFIES);
 946                         ipmi_ssif_unlock_cond(ssif_info, flags);
 947                 }
 948         }
 949 }
 950
 951 static int start_resend(struct ssif_info *ssif_info)
 952 {
 953         int rv;
 954         int command;
 955
 956         ssif_info->got_alert = false;
 957
 958         if (ssif_info->data_len > 32) {
 959                 command = SSIF_IPMI_MULTI_PART_REQUEST_START;
 960                 ssif_info->multi_data = ssif_info->data;
 961                 ssif_info->multi_len = ssif_info->data_len;
 962                 /*
 963                  * Subtle thing, this is 32, not 33, because we will
 964                  * overwrite the thing at position 32 (which was just
 965                  * transmitted) with the new length.
 966                  */
 967                 ssif_info->multi_pos = 32;
 968                 ssif_info->data[0] = 32;
 969         } else {
 970                 ssif_info->multi_data = NULL;
 971                 command = SSIF_IPMI_REQUEST;
 972                 ssif_info->data[0] = ssif_info->data_len;
 973         }
 974
 975         rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
 976                           command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
 977         if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG))
 978                 pr_info("Error from i2c_non_blocking_op(4)\n");
 979         return rv;
 980 }
 981
 982 static int start_send(struct ssif_info *ssif_info,
 983                       unsigned char   *data,
 984                       unsigned int    len)
 985 {
 986         if (len > IPMI_MAX_MSG_LENGTH)
 987                 return -E2BIG;
 988         if (len > ssif_info->max_xmit_msg_size)
 989                 return -E2BIG;
 990
 991         ssif_info->retries_left = SSIF_SEND_RETRIES;
 992         memcpy(ssif_info->data + 1, data, len);
 993         ssif_info->data_len = len;
 994         return start_resend(ssif_info);
 995 }
 996
 997 /* Must be called with the message lock held. */
 998 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags)
 999 {
1000         struct ipmi_smi_msg *msg;
1001         unsigned long oflags;
1002
1003  restart:
1004         if (!SSIF_IDLE(ssif_info)) {
1005                 ipmi_ssif_unlock_cond(ssif_info, flags);
1006                 return;
1007         }
1008
1009         if (!ssif_info->waiting_msg) {
1010                 ssif_info->curr_msg = NULL;
1011                 ipmi_ssif_unlock_cond(ssif_info, flags);
1012         } else {
1013                 int rv;
1014
1015                 ssif_info->curr_msg = ssif_info->waiting_msg;
1016                 ssif_info->waiting_msg = NULL;
1017                 ipmi_ssif_unlock_cond(ssif_info, flags);
1018                 rv = start_send(ssif_info,
1019                                 ssif_info->curr_msg->data,
1020                                 ssif_info->curr_msg->data_size);
1021                 if (rv) {
1022                         msg = ssif_info->curr_msg;
1023                         ssif_info->curr_msg = NULL;
1024                         return_hosed_msg(ssif_info, msg);
1025                         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1026                         goto restart;
1027                 }
1028         }
1029 }
1030
1031 static void sender(void                *send_info,
1032                    struct ipmi_smi_msg *msg)
1033 {
1034         struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1035         unsigned long oflags, *flags;
1036
1037         BUG_ON(ssif_info->waiting_msg);
1038         ssif_info->waiting_msg = msg;
1039
1040         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1041         start_next_msg(ssif_info, flags);
1042
1043         if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) {
1044                 struct timeval t;
1045
1046                 do_gettimeofday(&t);
1047                 pr_info("**Enqueue %02x %02x: %ld.%6.6ld\n",
1048                        msg->data[0], msg->data[1],
1049                        (long) t.tv_sec, (long) t.tv_usec);
1050         }
1051 }
1052
1053 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1054 {
1055         struct ssif_info *ssif_info = send_info;
1056
1057         data->addr_src = ssif_info->addr_source;
1058         data->dev = &ssif_info->client->dev;
1059         data->addr_info = ssif_info->addr_info;
1060         get_device(data->dev);
1061
1062         return 0;
1063 }
1064
1065 /*
1066  * Instead of having our own timer to periodically check the message
1067  * flags, we let the message handler drive us.
1068  */
1069 static void request_events(void *send_info)
1070 {
1071         struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1072         unsigned long oflags, *flags;
1073
1074         if (!ssif_info->has_event_buffer)
1075                 return;
1076
1077         flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1078         /*
1079          * Request flags first, not events, because the lower layer
1080          * doesn't have a way to send an attention.  But make sure
1081          * event checking still happens.
1082          */
1083         ssif_info->req_events = true;
1084         if (SSIF_IDLE(ssif_info))
1085                 start_flag_fetch(ssif_info, flags);
1086         else {
1087                 ssif_info->req_flags = true;
1088                 ipmi_ssif_unlock_cond(ssif_info, flags);
1089         }
1090 }
1091
1092 static int inc_usecount(void *send_info)
1093 {
1094         struct ssif_info *ssif_info = send_info;
1095
1096         if (!i2c_get_adapter(ssif_info->client->adapter->nr))
1097                 return -ENODEV;
1098
1099         i2c_use_client(ssif_info->client);
1100         return 0;
1101 }
1102
1103 static void dec_usecount(void *send_info)
1104 {
1105         struct ssif_info *ssif_info = send_info;
1106
1107         i2c_release_client(ssif_info->client);
1108         i2c_put_adapter(ssif_info->client->adapter);
1109 }
1110
1111 static int ssif_start_processing(void *send_info,
1112                                  ipmi_smi_t intf)
1113 {
1114         struct ssif_info *ssif_info = send_info;
1115
1116         ssif_info->intf = intf;
1117
1118         return 0;
1119 }
1120
1121 #define MAX_SSIF_BMCS 4
1122
1123 static unsigned short addr[MAX_SSIF_BMCS];
1124 static int num_addrs;
1125 module_param_array(addr, ushort, &num_addrs, 0);
1126 MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs.");
1127
1128 static char *adapter_name[MAX_SSIF_BMCS];
1129 static int num_adapter_names;
1130 module_param_array(adapter_name, charp, &num_adapter_names, 0);
1131 MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC.  By default all devices are scanned.");
1132
1133 static int slave_addrs[MAX_SSIF_BMCS];
1134 static int num_slave_addrs;
1135 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1136 MODULE_PARM_DESC(slave_addrs,
1137                  "The default IPMB slave address for the controller.");
1138
1139 /*
1140  * Bit 0 enables message debugging, bit 1 enables state debugging, and
1141  * bit 2 enables timing debugging.  This is an array indexed by
1142  * interface number"
1143  */
1144 static int dbg[MAX_SSIF_BMCS];
1145 static int num_dbg;
1146 module_param_array(dbg, int, &num_dbg, 0);
1147 MODULE_PARM_DESC(dbg, "Turn on debugging.");
1148
1149 static bool ssif_dbg_probe;
1150 module_param_named(dbg_probe, ssif_dbg_probe, bool, 0);
1151 MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters.");
1152
1153 static int use_thread;
1154 module_param(use_thread, int, 0);
1155 MODULE_PARM_DESC(use_thread, "Use the thread interface.");
1156
1157 static bool ssif_tryacpi = 1;
1158 module_param_named(tryacpi, ssif_tryacpi, bool, 0);
1159 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
1160
1161 static bool ssif_trydmi = 1;
1162 module_param_named(trydmi, ssif_trydmi, bool, 0);
1163 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
1164
1165 static DEFINE_MUTEX(ssif_infos_mutex);
1166 static LIST_HEAD(ssif_infos);
1167
1168 static int ssif_remove(struct i2c_client *client)
1169 {
1170         struct ssif_info *ssif_info = i2c_get_clientdata(client);
1171         int rv;
1172
1173         if (!ssif_info)
1174                 return 0;
1175
1176         /*
1177          * After this point, we won't deliver anything asychronously
1178          * to the message handler.  We can unregister ourself.
1179          */
1180         rv = ipmi_unregister_smi(ssif_info->intf);
1181         if (rv) {
1182                 pr_err(PFX "Unable to unregister device: errno=%d\n", rv);
1183                 return rv;
1184         }
1185         ssif_info->intf = NULL;
1186
1187         /* make sure the driver is not looking for flags any more. */
1188         while (ssif_info->ssif_state != SSIF_NORMAL)
1189                 schedule_timeout(1);
1190
1191         ssif_info->stopping = true;
1192         del_timer_sync(&ssif_info->retry_timer);
1193         if (ssif_info->thread) {
1194                 complete(&ssif_info->wake_thread);
1195                 kthread_stop(ssif_info->thread);
1196         }
1197
1198         /*
1199          * No message can be outstanding now, we have removed the
1200          * upper layer and it permitted us to do so.
1201          */
1202         kfree(ssif_info);
1203         return 0;
1204 }
1205
1206 static int do_cmd(struct i2c_client *client, int len, unsigned char *msg,
1207                   int *resp_len, unsigned char *resp)
1208 {
1209         int retry_cnt;
1210         int ret;
1211
1212         retry_cnt = SSIF_SEND_RETRIES;
1213  retry1:
1214         ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg);
1215         if (ret) {
1216                 retry_cnt--;
1217                 if (retry_cnt > 0)
1218                         goto retry1;
1219                 return -ENODEV;
1220         }
1221
1222         ret = -ENODEV;
1223         retry_cnt = SSIF_RECV_RETRIES;
1224         while (retry_cnt > 0) {
1225                 ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE,
1226                                                 resp);
1227                 if (ret > 0)
1228                         break;
1229                 msleep(SSIF_MSG_MSEC);
1230                 retry_cnt--;
1231                 if (retry_cnt <= 0)
1232                         break;
1233         }
1234
1235         if (ret > 0) {
1236                 /* Validate that the response is correct. */
1237                 if (ret < 3 ||
1238                     (resp[0] != (msg[0] | (1 << 2))) ||
1239                     (resp[1] != msg[1]))
1240                         ret = -EINVAL;
1241                 else {
1242                         *resp_len = ret;
1243                         ret = 0;
1244                 }
1245         }
1246
1247         return ret;
1248 }
1249
1250 static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
1251 {
1252         unsigned char *resp;
1253         unsigned char msg[3];
1254         int           rv;
1255         int           len;
1256
1257         resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1258         if (!resp)
1259                 return -ENOMEM;
1260
1261         /* Do a Get Device ID command, since it is required. */
1262         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1263         msg[1] = IPMI_GET_DEVICE_ID_CMD;
1264         rv = do_cmd(client, 2, msg, &len, resp);
1265         if (rv)
1266                 rv = -ENODEV;
1267         else
1268                 strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
1269         kfree(resp);
1270         return rv;
1271 }
1272
1273 static int smi_type_proc_show(struct seq_file *m, void *v)
1274 {
1275         seq_puts(m, "ssif\n");
1276
1277         return 0;
1278 }
1279
1280 static int smi_type_proc_open(struct inode *inode, struct file *file)
1281 {
1282         return single_open(file, smi_type_proc_show, inode->i_private);
1283 }
1284
1285 static const struct file_operations smi_type_proc_ops = {
1286         .open           = smi_type_proc_open,
1287         .read           = seq_read,
1288         .llseek         = seq_lseek,
1289         .release        = single_release,
1290 };
1291
1292 static int smi_stats_proc_show(struct seq_file *m, void *v)
1293 {
1294         struct ssif_info *ssif_info = m->private;
1295
1296         seq_printf(m, "sent_messages:          %u\n",
1297                    ssif_get_stat(ssif_info, sent_messages));
1298         seq_printf(m, "sent_messages_parts:    %u\n",
1299                    ssif_get_stat(ssif_info, sent_messages_parts));
1300         seq_printf(m, "send_retries:           %u\n",
1301                    ssif_get_stat(ssif_info, send_retries));
1302         seq_printf(m, "send_errors:            %u\n",
1303                    ssif_get_stat(ssif_info, send_errors));
1304         seq_printf(m, "received_messages:      %u\n",
1305                    ssif_get_stat(ssif_info, received_messages));
1306         seq_printf(m, "received_message_parts: %u\n",
1307                    ssif_get_stat(ssif_info, received_message_parts));
1308         seq_printf(m, "receive_retries:        %u\n",
1309                    ssif_get_stat(ssif_info, receive_retries));
1310         seq_printf(m, "receive_errors:         %u\n",
1311                    ssif_get_stat(ssif_info, receive_errors));
1312         seq_printf(m, "flag_fetches:           %u\n",
1313                    ssif_get_stat(ssif_info, flag_fetches));
1314         seq_printf(m, "hosed:                  %u\n",
1315                    ssif_get_stat(ssif_info, hosed));
1316         seq_printf(m, "events:                 %u\n",
1317                    ssif_get_stat(ssif_info, events));
1318         seq_printf(m, "watchdog_pretimeouts:   %u\n",
1319                    ssif_get_stat(ssif_info, watchdog_pretimeouts));
1320         seq_printf(m, "alerts:                 %u\n",
1321                    ssif_get_stat(ssif_info, alerts));
1322         return 0;
1323 }
1324
1325 static int smi_stats_proc_open(struct inode *inode, struct file *file)
1326 {
1327         return single_open(file, smi_stats_proc_show, PDE_DATA(inode));
1328 }
1329
1330 static const struct file_operations smi_stats_proc_ops = {
1331         .open           = smi_stats_proc_open,
1332         .read           = seq_read,
1333         .llseek         = seq_lseek,
1334         .release        = single_release,
1335 };
1336
1337 static int strcmp_nospace(char *s1, char *s2)
1338 {
1339         while (*s1 && *s2) {
1340                 while (isspace(*s1))
1341                         s1++;
1342                 while (isspace(*s2))
1343                         s2++;
1344                 if (*s1 > *s2)
1345                         return 1;
1346                 if (*s1 < *s2)
1347                         return -1;
1348                 s1++;
1349                 s2++;
1350         }
1351         return 0;
1352 }
1353
1354 static struct ssif_addr_info *ssif_info_find(unsigned short addr,
1355                                              char *adapter_name,
1356                                              bool match_null_name)
1357 {
1358         struct ssif_addr_info *info, *found = NULL;
1359
1360 restart:
1361         list_for_each_entry(info, &ssif_infos, link) {
1362                 if (info->binfo.addr == addr) {
1363                         if (info->adapter_name || adapter_name) {
1364                                 if (!info->adapter_name != !adapter_name) {
1365                                         /* One is NULL and one is not */
1366                                         continue;
1367                                 }
1368                                 if (adapter_name &&
1369                                     strcmp_nospace(info->adapter_name,
1370                                                    adapter_name))
1371                                         /* Names do not match */
1372                                         continue;
1373                         }
1374                         found = info;
1375                         break;
1376                 }
1377         }
1378
1379         if (!found && match_null_name) {
1380                 /* Try to get an exact match first, then try with a NULL name */
1381                 adapter_name = NULL;
1382                 match_null_name = false;
1383                 goto restart;
1384         }
1385
1386         return found;
1387 }
1388
1389 static bool check_acpi(struct ssif_info *ssif_info, struct device *dev)
1390 {
1391 #ifdef CONFIG_ACPI
1392         acpi_handle acpi_handle;
1393
1394         acpi_handle = ACPI_HANDLE(dev);
1395         if (acpi_handle) {
1396                 ssif_info->addr_source = SI_ACPI;
1397                 ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle;
1398                 return true;
1399         }
1400 #endif
1401         return false;
1402 }
1403
1404 /*
1405  * Global enables we care about.
1406  */
1407 #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
1408                              IPMI_BMC_EVT_MSG_INTR)
1409
1410 static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
1411 {
1412         unsigned char     msg[3];
1413         unsigned char     *resp;
1414         struct ssif_info   *ssif_info;
1415         int               rv = 0;
1416         int               len;
1417         int               i;
1418         u8                slave_addr = 0;
1419         struct ssif_addr_info *addr_info = NULL;
1420
1421
1422         resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1423         if (!resp)
1424                 return -ENOMEM;
1425
1426         ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
1427         if (!ssif_info) {
1428                 kfree(resp);
1429                 return -ENOMEM;
1430         }
1431
1432         if (!check_acpi(ssif_info, &client->dev)) {
1433                 addr_info = ssif_info_find(client->addr, client->adapter->name,
1434                                            true);
1435                 if (!addr_info) {
1436                         /* Must have come in through sysfs. */
1437                         ssif_info->addr_source = SI_HOTMOD;
1438                 } else {
1439                         ssif_info->addr_source = addr_info->addr_src;
1440                         ssif_info->ssif_debug = addr_info->debug;
1441                         ssif_info->addr_info = addr_info->addr_info;
1442                         slave_addr = addr_info->slave_addr;
1443                 }
1444         }
1445
1446         pr_info(PFX "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
1447                ipmi_addr_src_to_str(ssif_info->addr_source),
1448                client->addr, client->adapter->name, slave_addr);
1449
1450         /*
1451          * Do a Get Device ID command, since it comes back with some
1452          * useful info.
1453          */
1454         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1455         msg[1] = IPMI_GET_DEVICE_ID_CMD;
1456         rv = do_cmd(client, 2, msg, &len, resp);
1457         if (rv)
1458                 goto out;
1459
1460         rv = ipmi_demangle_device_id(resp, len, &ssif_info->device_id);
1461         if (rv)
1462                 goto out;
1463
1464         ssif_info->client = client;
1465         i2c_set_clientdata(client, ssif_info);
1466
1467         /* Now check for system interface capabilities */
1468         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1469         msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
1470         msg[2] = 0; /* SSIF */
1471         rv = do_cmd(client, 3, msg, &len, resp);
1472         if (!rv && (len >= 3) && (resp[2] == 0)) {
1473                 if (len < 7) {
1474                         if (ssif_dbg_probe)
1475                                 pr_info(PFX "SSIF info too short: %d\n", len);
1476                         goto no_support;
1477                 }
1478
1479                 /* Got a good SSIF response, handle it. */
1480                 ssif_info->max_xmit_msg_size = resp[5];
1481                 ssif_info->max_recv_msg_size = resp[6];
1482                 ssif_info->multi_support = (resp[4] >> 6) & 0x3;
1483                 ssif_info->supports_pec = (resp[4] >> 3) & 0x1;
1484
1485                 /* Sanitize the data */
1486                 switch (ssif_info->multi_support) {
1487                 case SSIF_NO_MULTI:
1488                         if (ssif_info->max_xmit_msg_size > 32)
1489                                 ssif_info->max_xmit_msg_size = 32;
1490                         if (ssif_info->max_recv_msg_size > 32)
1491                                 ssif_info->max_recv_msg_size = 32;
1492                         break;
1493
1494                 case SSIF_MULTI_2_PART:
1495                         if (ssif_info->max_xmit_msg_size > 63)
1496                                 ssif_info->max_xmit_msg_size = 63;
1497                         if (ssif_info->max_recv_msg_size > 62)
1498                                 ssif_info->max_recv_msg_size = 62;
1499                         break;
1500
1501                 case SSIF_MULTI_n_PART:
1502                         /*
1503                          * The specification is rather confusing at
1504                          * this point, but I think I understand what
1505                          * is meant.  At least I have a workable
1506                          * solution.  With multi-part messages, you
1507                          * cannot send a message that is a multiple of
1508                          * 32-bytes in length, because the start and
1509                          * middle messages are 32-bytes and the end
1510                          * message must be at least one byte.  You
1511                          * can't fudge on an extra byte, that would
1512                          * screw up things like fru data writes.  So
1513                          * we limit the length to 63 bytes.  That way
1514                          * a 32-byte message gets sent as a single
1515                          * part.  A larger message will be a 32-byte
1516                          * start and the next message is always going
1517                          * to be 1-31 bytes in length.  Not ideal, but
1518                          * it should work.
1519                          */
1520                         if (ssif_info->max_xmit_msg_size > 63)
1521                                 ssif_info->max_xmit_msg_size = 63;
1522                         break;
1523
1524                 default:
1525                         /* Data is not sane, just give up. */
1526                         goto no_support;
1527                 }
1528         } else {
1529  no_support:
1530                 /* Assume no multi-part or PEC support */
1531                 pr_info(PFX "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
1532                        rv, len, resp[2]);
1533
1534                 ssif_info->max_xmit_msg_size = 32;
1535                 ssif_info->max_recv_msg_size = 32;
1536                 ssif_info->multi_support = SSIF_NO_MULTI;
1537                 ssif_info->supports_pec = 0;
1538         }
1539
1540         /* Make sure the NMI timeout is cleared. */
1541         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1542         msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
1543         msg[2] = WDT_PRE_TIMEOUT_INT;
1544         rv = do_cmd(client, 3, msg, &len, resp);
1545         if (rv || (len < 3) || (resp[2] != 0))
1546                 pr_warn(PFX "Unable to clear message flags: %d %d %2.2x\n",
1547                         rv, len, resp[2]);
1548
1549         /* Attempt to enable the event buffer. */
1550         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1551         msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
1552         rv = do_cmd(client, 2, msg, &len, resp);
1553         if (rv || (len < 4) || (resp[2] != 0)) {
1554                 pr_warn(PFX "Error getting global enables: %d %d %2.2x\n",
1555                         rv, len, resp[2]);
1556                 rv = 0; /* Not fatal */
1557                 goto found;
1558         }
1559
1560         ssif_info->global_enables = resp[3];
1561
1562         if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
1563                 ssif_info->has_event_buffer = true;
1564                 /* buffer is already enabled, nothing to do. */
1565                 goto found;
1566         }
1567
1568         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1569         msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1570         msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF;
1571         rv = do_cmd(client, 3, msg, &len, resp);
1572         if (rv || (len < 2)) {
1573                 pr_warn(PFX "Error setting global enables: %d %d %2.2x\n",
1574                         rv, len, resp[2]);
1575                 rv = 0; /* Not fatal */
1576                 goto found;
1577         }
1578
1579         if (resp[2] == 0) {
1580                 /* A successful return means the event buffer is supported. */
1581                 ssif_info->has_event_buffer = true;
1582                 ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF;
1583         }
1584
1585         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1586         msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1587         msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR;
1588         rv = do_cmd(client, 3, msg, &len, resp);
1589         if (rv || (len < 2)) {
1590                 pr_warn(PFX "Error setting global enables: %d %d %2.2x\n",
1591                         rv, len, resp[2]);
1592                 rv = 0; /* Not fatal */
1593                 goto found;
1594         }
1595
1596         if (resp[2] == 0) {
1597                 /* A successful return means the alert is supported. */
1598                 ssif_info->supports_alert = true;
1599                 ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR;
1600         }
1601
1602  found:
1603         ssif_info->intf_num = atomic_inc_return(&next_intf);
1604
1605         if (ssif_dbg_probe) {
1606                 pr_info("ssif_probe: i2c_probe found device at i2c address %x\n",
1607                         client->addr);
1608         }
1609
1610         spin_lock_init(&ssif_info->lock);
1611         ssif_info->ssif_state = SSIF_NORMAL;
1612         init_timer(&ssif_info->retry_timer);
1613         ssif_info->retry_timer.data = (unsigned long) ssif_info;
1614         ssif_info->retry_timer.function = retry_timeout;
1615
1616         for (i = 0; i < SSIF_NUM_STATS; i++)
1617                 atomic_set(&ssif_info->stats[i], 0);
1618
1619         if (ssif_info->supports_pec)
1620                 ssif_info->client->flags |= I2C_CLIENT_PEC;
1621
1622         ssif_info->handlers.owner = THIS_MODULE;
1623         ssif_info->handlers.start_processing = ssif_start_processing;
1624         ssif_info->handlers.get_smi_info = get_smi_info;
1625         ssif_info->handlers.sender = sender;
1626         ssif_info->handlers.request_events = request_events;
1627         ssif_info->handlers.inc_usecount = inc_usecount;
1628         ssif_info->handlers.dec_usecount = dec_usecount;
1629
1630         {
1631                 unsigned int thread_num;
1632
1633                 thread_num = ((ssif_info->client->adapter->nr << 8) |
1634                               ssif_info->client->addr);
1635                 init_completion(&ssif_info->wake_thread);
1636                 ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info,
1637                                                "kssif%4.4x", thread_num);
1638                 if (IS_ERR(ssif_info->thread)) {
1639                         rv = PTR_ERR(ssif_info->thread);
1640                         dev_notice(&ssif_info->client->dev,
1641                                    "Could not start kernel thread: error %d\n",
1642                                    rv);
1643                         goto out;
1644                 }
1645         }
1646
1647         rv = ipmi_register_smi(&ssif_info->handlers,
1648                                ssif_info,
1649                                &ssif_info->device_id,
1650                                &ssif_info->client->dev,
1651                                slave_addr);
1652          if (rv) {
1653                 pr_err(PFX "Unable to register device: error %d\n", rv);
1654                 goto out;
1655         }
1656
1657         rv = ipmi_smi_add_proc_entry(ssif_info->intf, "type",
1658                                      &smi_type_proc_ops,
1659                                      ssif_info);
1660         if (rv) {
1661                 pr_err(PFX "Unable to create proc entry: %d\n", rv);
1662                 goto out_err_unreg;
1663         }
1664
1665         rv = ipmi_smi_add_proc_entry(ssif_info->intf, "ssif_stats",
1666                                      &smi_stats_proc_ops,
1667                                      ssif_info);
1668         if (rv) {
1669                 pr_err(PFX "Unable to create proc entry: %d\n", rv);
1670                 goto out_err_unreg;
1671         }
1672
1673  out:
1674         if (rv)
1675                 kfree(ssif_info);
1676         kfree(resp);
1677         return rv;
1678
1679  out_err_unreg:
1680         ipmi_unregister_smi(ssif_info->intf);
1681         goto out;
1682 }
1683
1684 static int ssif_adapter_handler(struct device *adev, void *opaque)
1685 {
1686         struct ssif_addr_info *addr_info = opaque;
1687
1688         if (adev->type != &i2c_adapter_type)
1689                 return 0;
1690
1691         i2c_new_device(to_i2c_adapter(adev), &addr_info->binfo);
1692
1693         if (!addr_info->adapter_name)
1694                 return 1; /* Only try the first I2C adapter by default. */
1695         return 0;
1696 }
1697
1698 static int new_ssif_client(int addr, char *adapter_name,
1699                            int debug, int slave_addr,
1700                            enum ipmi_addr_src addr_src)
1701 {
1702         struct ssif_addr_info *addr_info;
1703         int rv = 0;
1704
1705         mutex_lock(&ssif_infos_mutex);
1706         if (ssif_info_find(addr, adapter_name, false)) {
1707                 rv = -EEXIST;
1708                 goto out_unlock;
1709         }
1710
1711         addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL);
1712         if (!addr_info) {
1713                 rv = -ENOMEM;
1714                 goto out_unlock;
1715         }
1716
1717         if (adapter_name) {
1718                 addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL);
1719                 if (!addr_info->adapter_name) {
1720                         kfree(addr_info);
1721                         rv = -ENOMEM;
1722                         goto out_unlock;
1723                 }
1724         }
1725
1726         strncpy(addr_info->binfo.type, DEVICE_NAME,
1727                 sizeof(addr_info->binfo.type));
1728         addr_info->binfo.addr = addr;
1729         addr_info->binfo.platform_data = addr_info;
1730         addr_info->debug = debug;
1731         addr_info->slave_addr = slave_addr;
1732         addr_info->addr_src = addr_src;
1733
1734         list_add_tail(&addr_info->link, &ssif_infos);
1735
1736         if (initialized)
1737                 i2c_for_each_dev(addr_info, ssif_adapter_handler);
1738         /* Otherwise address list will get it */
1739
1740 out_unlock:
1741         mutex_unlock(&ssif_infos_mutex);
1742         return rv;
1743 }
1744
1745 static void free_ssif_clients(void)
1746 {
1747         struct ssif_addr_info *info, *tmp;
1748
1749         mutex_lock(&ssif_infos_mutex);
1750         list_for_each_entry_safe(info, tmp, &ssif_infos, link) {
1751                 list_del(&info->link);
1752                 kfree(info->adapter_name);
1753                 kfree(info);
1754         }
1755         mutex_unlock(&ssif_infos_mutex);
1756 }
1757
1758 static unsigned short *ssif_address_list(void)
1759 {
1760         struct ssif_addr_info *info;
1761         unsigned int count = 0, i;
1762         unsigned short *address_list;
1763
1764         list_for_each_entry(info, &ssif_infos, link)
1765                 count++;
1766
1767         address_list = kzalloc(sizeof(*address_list) * (count + 1), GFP_KERNEL);
1768         if (!address_list)
1769                 return NULL;
1770
1771         i = 0;
1772         list_for_each_entry(info, &ssif_infos, link) {
1773                 unsigned short addr = info->binfo.addr;
1774                 int j;
1775
1776                 for (j = 0; j < i; j++) {
1777                         if (address_list[j] == addr)
1778                                 goto skip_addr;
1779                 }
1780                 address_list[i] = addr;
1781 skip_addr:
1782                 i++;
1783         }
1784         address_list[i] = I2C_CLIENT_END;
1785
1786         return address_list;
1787 }
1788
1789 #ifdef CONFIG_ACPI
1790 static struct acpi_device_id ssif_acpi_match[] = {
1791         { "IPI0001", 0 },
1792         { },
1793 };
1794 MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
1795
1796 /*
1797  * Once we get an ACPI failure, we don't try any more, because we go
1798  * through the tables sequentially.  Once we don't find a table, there
1799  * are no more.
1800  */
1801 static int acpi_failure;
1802
1803 /*
1804  * Defined in the IPMI 2.0 spec.
1805  */
1806 struct SPMITable {
1807         s8      Signature[4];
1808         u32     Length;
1809         u8      Revision;
1810         u8      Checksum;
1811         s8      OEMID[6];
1812         s8      OEMTableID[8];
1813         s8      OEMRevision[4];
1814         s8      CreatorID[4];
1815         s8      CreatorRevision[4];
1816         u8      InterfaceType;
1817         u8      IPMIlegacy;
1818         s16     SpecificationRevision;
1819
1820         /*
1821          * Bit 0 - SCI interrupt supported
1822          * Bit 1 - I/O APIC/SAPIC
1823          */
1824         u8      InterruptType;
1825
1826         /*
1827          * If bit 0 of InterruptType is set, then this is the SCI
1828          * interrupt in the GPEx_STS register.
1829          */
1830         u8      GPE;
1831
1832         s16     Reserved;
1833
1834         /*
1835          * If bit 1 of InterruptType is set, then this is the I/O
1836          * APIC/SAPIC interrupt.
1837          */
1838         u32     GlobalSystemInterrupt;
1839
1840         /* The actual register address. */
1841         struct acpi_generic_address addr;
1842
1843         u8      UID[4];
1844
1845         s8      spmi_id[1]; /* A '\0' terminated array starts here. */
1846 };
1847
1848 static int try_init_spmi(struct SPMITable *spmi)
1849 {
1850         unsigned short myaddr;
1851
1852         if (num_addrs >= MAX_SSIF_BMCS)
1853                 return -1;
1854
1855         if (spmi->IPMIlegacy != 1) {
1856                 pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy);
1857                 return -ENODEV;
1858         }
1859
1860         if (spmi->InterfaceType != 4)
1861                 return -ENODEV;
1862
1863         if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) {
1864                 pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n",
1865                         spmi->addr.space_id);
1866                 return -EIO;
1867         }
1868
1869         myaddr = spmi->addr.address >> 1;
1870
1871         return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI);
1872 }
1873
1874 static void spmi_find_bmc(void)
1875 {
1876         acpi_status      status;
1877         struct SPMITable *spmi;
1878         int              i;
1879
1880         if (acpi_disabled)
1881                 return;
1882
1883         if (acpi_failure)
1884                 return;
1885
1886         for (i = 0; ; i++) {
1887                 status = acpi_get_table(ACPI_SIG_SPMI, i+1,
1888                                         (struct acpi_table_header **)&spmi);
1889                 if (status != AE_OK)
1890                         return;
1891
1892                 try_init_spmi(spmi);
1893         }
1894 }
1895 #else
1896 static void spmi_find_bmc(void) { }
1897 #endif
1898
1899 #ifdef CONFIG_DMI
1900 static int decode_dmi(const struct dmi_device *dmi_dev)
1901 {
1902         struct dmi_header *dm = dmi_dev->device_data;
1903         u8             *data = (u8 *) dm;
1904         u8             len = dm->length;
1905         unsigned short myaddr;
1906         int            slave_addr;
1907
1908         if (num_addrs >= MAX_SSIF_BMCS)
1909                 return -1;
1910
1911         if (len < 9)
1912                 return -1;
1913
1914         if (data[0x04] != 4) /* Not SSIF */
1915                 return -1;
1916
1917         if ((data[8] >> 1) == 0) {
1918                 /*
1919                  * Some broken systems put the I2C address in
1920                  * the slave address field.  We try to
1921                  * accommodate them here.
1922                  */
1923                 myaddr = data[6] >> 1;
1924                 slave_addr = 0;
1925         } else {
1926                 myaddr = data[8] >> 1;
1927                 slave_addr = data[6];
1928         }
1929
1930         return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS);
1931 }
1932
1933 static void dmi_iterator(void)
1934 {
1935         const struct dmi_device *dev = NULL;
1936
1937         while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
1938                 decode_dmi(dev);
1939 }
1940 #else
1941 static void dmi_iterator(void) { }
1942 #endif
1943
1944 static const struct i2c_device_id ssif_id[] = {
1945         { DEVICE_NAME, 0 },
1946         { }
1947 };
1948 MODULE_DEVICE_TABLE(i2c, ssif_id);
1949
1950 static struct i2c_driver ssif_i2c_driver = {
1951         .class          = I2C_CLASS_HWMON,
1952         .driver         = {
1953                 .owner                  = THIS_MODULE,
1954                 .name                   = DEVICE_NAME
1955         },
1956         .probe          = ssif_probe,
1957         .remove         = ssif_remove,
1958         .alert          = ssif_alert,
1959         .id_table       = ssif_id,
1960         .detect         = ssif_detect
1961 };
1962
1963 static int init_ipmi_ssif(void)
1964 {
1965         int i;
1966         int rv;
1967
1968         if (initialized)
1969                 return 0;
1970
1971         pr_info("IPMI SSIF Interface driver\n");
1972
1973         /* build list for i2c from addr list */
1974         for (i = 0; i < num_addrs; i++) {
1975                 rv = new_ssif_client(addr[i], adapter_name[i],
1976                                      dbg[i], slave_addrs[i],
1977                                      SI_HARDCODED);
1978                 if (rv)
1979                         pr_err(PFX
1980                                "Couldn't add hardcoded device at addr 0x%x\n",
1981                                addr[i]);
1982         }
1983
1984         if (ssif_tryacpi)
1985                 ssif_i2c_driver.driver.acpi_match_table =
1986                         ACPI_PTR(ssif_acpi_match);
1987         if (ssif_trydmi)
1988                 dmi_iterator();
1989         if (ssif_tryacpi)
1990                 spmi_find_bmc();
1991
1992         ssif_i2c_driver.address_list = ssif_address_list();
1993
1994         rv = i2c_add_driver(&ssif_i2c_driver);
1995         if (!rv)
1996                 initialized = true;
1997
1998         return rv;
1999 }
2000 module_init(init_ipmi_ssif);
2001
2002 static void cleanup_ipmi_ssif(void)
2003 {
2004         if (!initialized)
2005                 return;
2006
2007         initialized = false;
2008
2009         i2c_del_driver(&ssif_i2c_driver);
2010
2011         free_ssif_clients();
2012 }
2013 module_exit(cleanup_ipmi_ssif);
2014
2015 MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
2016 MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
2017 MODULE_LICENSE("GPL");