1 /* 2 * 3 * Intel Management Engine Interface (Intel MEI) Linux driver 4 * Copyright (c) 2003-2012, Intel Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 */ 16 17 #ifndef _MEI_DEV_H_ 18 #define _MEI_DEV_H_ 19 20 #include <linux/types.h> 21 #include <linux/cdev.h> 22 #include <linux/poll.h> 23 #include <linux/mei.h> 24 #include <linux/mei_cl_bus.h> 25 26 #include "hw.h" 27 #include "hbm.h" 28 29 30 /* 31 * AMTHI Client UUID 32 */ 33 extern const uuid_le mei_amthif_guid; 34 35 #define MEI_RD_MSG_BUF_SIZE (128 * sizeof(u32)) 36 37 /* 38 * Number of Maximum MEI Clients 39 */ 40 #define MEI_CLIENTS_MAX 256 41 42 /* 43 * maximum number of consecutive resets 44 */ 45 #define MEI_MAX_CONSEC_RESET 3 46 47 /* 48 * Number of File descriptors/handles 49 * that can be opened to the driver. 50 * 51 * Limit to 255: 256 Total Clients 52 * minus internal client for MEI Bus Messages 53 */ 54 #define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1) 55 56 /* File state */ 57 enum file_state { 58 MEI_FILE_INITIALIZING = 0, 59 MEI_FILE_CONNECTING, 60 MEI_FILE_CONNECTED, 61 MEI_FILE_DISCONNECTING, 62 MEI_FILE_DISCONNECT_REPLY, 63 MEI_FILE_DISCONNECT_REQUIRED, 64 MEI_FILE_DISCONNECTED, 65 }; 66 67 /* MEI device states */ 68 enum mei_dev_state { 69 MEI_DEV_INITIALIZING = 0, 70 MEI_DEV_INIT_CLIENTS, 71 MEI_DEV_ENABLED, 72 MEI_DEV_RESETTING, 73 MEI_DEV_DISABLED, 74 MEI_DEV_POWER_DOWN, 75 MEI_DEV_POWER_UP 76 }; 77 78 const char *mei_dev_state_str(int state); 79 80 enum iamthif_states { 81 MEI_IAMTHIF_IDLE, 82 MEI_IAMTHIF_WRITING, 83 MEI_IAMTHIF_FLOW_CONTROL, 84 MEI_IAMTHIF_READING, 85 MEI_IAMTHIF_READ_COMPLETE 86 }; 87 88 enum mei_file_transaction_states { 89 MEI_IDLE, 90 MEI_WRITING, 91 MEI_WRITE_COMPLETE, 92 MEI_FLOW_CONTROL, 93 MEI_READING, 94 MEI_READ_COMPLETE 95 }; 96 97 /** 98 * enum mei_cb_file_ops - file operation associated with the callback 99 * @MEI_FOP_READ: read 100 * @MEI_FOP_WRITE: write 101 * @MEI_FOP_CONNECT: connect 102 * @MEI_FOP_DISCONNECT: disconnect 103 * @MEI_FOP_DISCONNECT_RSP: disconnect response 104 * @MEI_FOP_NOTIFY_START: start notification 105 * @MEI_FOP_NOTIFY_STOP: stop notification 106 */ 107 enum mei_cb_file_ops { 108 MEI_FOP_READ = 0, 109 MEI_FOP_WRITE, 110 MEI_FOP_CONNECT, 111 MEI_FOP_DISCONNECT, 112 MEI_FOP_DISCONNECT_RSP, 113 MEI_FOP_NOTIFY_START, 114 MEI_FOP_NOTIFY_STOP, 115 }; 116 117 /* 118 * Intel MEI message data struct 119 */ 120 struct mei_msg_data { 121 size_t size; 122 unsigned char *data; 123 }; 124 125 /* Maximum number of processed FW status registers */ 126 #define MEI_FW_STATUS_MAX 6 127 /* Minimal buffer for FW status string (8 bytes in dw + space or '\0') */ 128 #define MEI_FW_STATUS_STR_SZ (MEI_FW_STATUS_MAX * (8 + 1)) 129 130 131 /* 132 * struct mei_fw_status - storage of FW status data 133 * 134 * @count: number of actually available elements in array 135 * @status: FW status registers 136 */ 137 struct mei_fw_status { 138 int count; 139 u32 status[MEI_FW_STATUS_MAX]; 140 }; 141 142 /** 143 * struct mei_me_client - representation of me (fw) client 144 * 145 * @list: link in me client list 146 * @refcnt: struct reference count 147 * @props: client properties 148 * @client_id: me client id 149 * @mei_flow_ctrl_creds: flow control credits 150 * @connect_count: number connections to this client 151 * @bus_added: added to bus 152 */ 153 struct mei_me_client { 154 struct list_head list; 155 struct kref refcnt; 156 struct mei_client_properties props; 157 u8 client_id; 158 u8 mei_flow_ctrl_creds; 159 u8 connect_count; 160 u8 bus_added; 161 }; 162 163 164 struct mei_cl; 165 166 /** 167 * struct mei_cl_cb - file operation callback structure 168 * 169 * @list: link in callback queue 170 * @cl: file client who is running this operation 171 * @fop_type: file operation type 172 * @buf: buffer for data associated with the callback 173 * @buf_idx: last read index 174 * @fp: pointer to file structure 175 * @status: io status of the cb 176 * @internal: communication between driver and FW flag 177 * @completed: the transfer or reception has completed 178 */ 179 struct mei_cl_cb { 180 struct list_head list; 181 struct mei_cl *cl; 182 enum mei_cb_file_ops fop_type; 183 struct mei_msg_data buf; 184 size_t buf_idx; 185 const struct file *fp; 186 int status; 187 u32 internal:1; 188 u32 completed:1; 189 }; 190 191 /** 192 * struct mei_cl - me client host representation 193 * carried in file->private_data 194 * 195 * @link: link in the clients list 196 * @dev: mei parent device 197 * @state: file operation state 198 * @tx_wait: wait queue for tx completion 199 * @rx_wait: wait queue for rx completion 200 * @wait: wait queue for management operation 201 * @ev_wait: notification wait queue 202 * @ev_async: event async notification 203 * @status: connection status 204 * @me_cl: fw client connected 205 * @host_client_id: host id 206 * @mei_flow_ctrl_creds: transmit flow credentials 207 * @timer_count: watchdog timer for operation completion 208 * @reserved: reserved for alignment 209 * @notify_en: notification - enabled/disabled 210 * @notify_ev: pending notification event 211 * @writing_state: state of the tx 212 * @rd_pending: pending read credits 213 * @rd_completed: completed read 214 * 215 * @cldev: device on the mei client bus 216 */ 217 struct mei_cl { 218 struct list_head link; 219 struct mei_device *dev; 220 enum file_state state; 221 wait_queue_head_t tx_wait; 222 wait_queue_head_t rx_wait; 223 wait_queue_head_t wait; 224 wait_queue_head_t ev_wait; 225 struct fasync_struct *ev_async; 226 int status; 227 struct mei_me_client *me_cl; 228 u8 host_client_id; 229 u8 mei_flow_ctrl_creds; 230 u8 timer_count; 231 u8 reserved; 232 u8 notify_en; 233 u8 notify_ev; 234 enum mei_file_transaction_states writing_state; 235 struct list_head rd_pending; 236 struct list_head rd_completed; 237 238 struct mei_cl_device *cldev; 239 }; 240 241 /** 242 * struct mei_hw_ops - hw specific ops 243 * 244 * @host_is_ready : query for host readiness 245 * 246 * @hw_is_ready : query if hw is ready 247 * @hw_reset : reset hw 248 * @hw_start : start hw after reset 249 * @hw_config : configure hw 250 * 251 * @fw_status : get fw status registers 252 * @pg_state : power gating state of the device 253 * @pg_in_transition : is device now in pg transition 254 * @pg_is_enabled : is power gating enabled 255 * 256 * @intr_clear : clear pending interrupts 257 * @intr_enable : enable interrupts 258 * @intr_disable : disable interrupts 259 * 260 * @hbuf_free_slots : query for write buffer empty slots 261 * @hbuf_is_ready : query if write buffer is empty 262 * @hbuf_max_len : query for write buffer max len 263 * 264 * @write : write a message to FW 265 * 266 * @rdbuf_full_slots : query how many slots are filled 267 * 268 * @read_hdr : get first 4 bytes (header) 269 * @read : read a buffer from the FW 270 */ 271 struct mei_hw_ops { 272 273 bool (*host_is_ready)(struct mei_device *dev); 274 275 bool (*hw_is_ready)(struct mei_device *dev); 276 int (*hw_reset)(struct mei_device *dev, bool enable); 277 int (*hw_start)(struct mei_device *dev); 278 void (*hw_config)(struct mei_device *dev); 279 280 281 int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts); 282 enum mei_pg_state (*pg_state)(struct mei_device *dev); 283 bool (*pg_in_transition)(struct mei_device *dev); 284 bool (*pg_is_enabled)(struct mei_device *dev); 285 286 void (*intr_clear)(struct mei_device *dev); 287 void (*intr_enable)(struct mei_device *dev); 288 void (*intr_disable)(struct mei_device *dev); 289 290 int (*hbuf_free_slots)(struct mei_device *dev); 291 bool (*hbuf_is_ready)(struct mei_device *dev); 292 size_t (*hbuf_max_len)(const struct mei_device *dev); 293 294 int (*write)(struct mei_device *dev, 295 struct mei_msg_hdr *hdr, 296 unsigned char *buf); 297 298 int (*rdbuf_full_slots)(struct mei_device *dev); 299 300 u32 (*read_hdr)(const struct mei_device *dev); 301 int (*read)(struct mei_device *dev, 302 unsigned char *buf, unsigned long len); 303 }; 304 305 /* MEI bus API*/ 306 void mei_cl_bus_rescan(struct mei_device *bus); 307 void mei_cl_bus_rescan_work(struct work_struct *work); 308 void mei_cl_bus_dev_fixup(struct mei_cl_device *dev); 309 ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, 310 bool blocking); 311 ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length); 312 bool mei_cl_bus_rx_event(struct mei_cl *cl); 313 bool mei_cl_bus_notify_event(struct mei_cl *cl); 314 void mei_cl_bus_remove_devices(struct mei_device *bus); 315 int mei_cl_bus_init(void); 316 void mei_cl_bus_exit(void); 317 318 /** 319 * enum mei_pg_event - power gating transition events 320 * 321 * @MEI_PG_EVENT_IDLE: the driver is not in power gating transition 322 * @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete 323 * @MEI_PG_EVENT_RECEIVED: the driver received pg event 324 * @MEI_PG_EVENT_INTR_WAIT: the driver is waiting for a pg event interrupt 325 * @MEI_PG_EVENT_INTR_RECEIVED: the driver received pg event interrupt 326 */ 327 enum mei_pg_event { 328 MEI_PG_EVENT_IDLE, 329 MEI_PG_EVENT_WAIT, 330 MEI_PG_EVENT_RECEIVED, 331 MEI_PG_EVENT_INTR_WAIT, 332 MEI_PG_EVENT_INTR_RECEIVED, 333 }; 334 335 /** 336 * enum mei_pg_state - device internal power gating state 337 * 338 * @MEI_PG_OFF: device is not power gated - it is active 339 * @MEI_PG_ON: device is power gated - it is in lower power state 340 */ 341 enum mei_pg_state { 342 MEI_PG_OFF = 0, 343 MEI_PG_ON = 1, 344 }; 345 346 const char *mei_pg_state_str(enum mei_pg_state state); 347 348 /** 349 * struct mei_device - MEI private device struct 350 * 351 * @dev : device on a bus 352 * @cdev : character device 353 * @minor : minor number allocated for device 354 * 355 * @write_list : write pending list 356 * @write_waiting_list : write completion list 357 * @ctrl_wr_list : pending control write list 358 * @ctrl_rd_list : pending control read list 359 * 360 * @file_list : list of opened handles 361 * @open_handle_count: number of opened handles 362 * 363 * @device_lock : big device lock 364 * @timer_work : MEI timer delayed work (timeouts) 365 * 366 * @recvd_hw_ready : hw ready message received flag 367 * 368 * @wait_hw_ready : wait queue for receive HW ready message form FW 369 * @wait_pg : wait queue for receive PG message from FW 370 * @wait_hbm_start : wait queue for receive HBM start message from FW 371 * 372 * @reset_count : number of consecutive resets 373 * @dev_state : device state 374 * @hbm_state : state of host bus message protocol 375 * @init_clients_timer : HBM init handshake timeout 376 * 377 * @pg_event : power gating event 378 * @pg_domain : runtime PM domain 379 * 380 * @rd_msg_buf : control messages buffer 381 * @rd_msg_hdr : read message header storage 382 * 383 * @hbuf_depth : depth of hardware host/write buffer is slots 384 * @hbuf_is_ready : query if the host host/write buffer is ready 385 * @wr_msg : the buffer for hbm control messages 386 * 387 * @version : HBM protocol version in use 388 * @hbm_f_pg_supported : hbm feature pgi protocol 389 * @hbm_f_dc_supported : hbm feature dynamic clients 390 * @hbm_f_dot_supported : hbm feature disconnect on timeout 391 * @hbm_f_ev_supported : hbm feature event notification 392 * @hbm_f_fa_supported : hbm feature fixed address client 393 * @hbm_f_ie_supported : hbm feature immediate reply to enum request 394 * 395 * @me_clients_rwsem: rw lock over me_clients list 396 * @me_clients : list of FW clients 397 * @me_clients_map : FW clients bit map 398 * @host_clients_map : host clients id pool 399 * @me_client_index : last FW client index in enumeration 400 * 401 * @allow_fixed_address: allow user space to connect a fixed client 402 * @override_fixed_address: force allow fixed address behavior 403 * 404 * @amthif_cmd_list : amthif list for cmd waiting 405 * @iamthif_fp : file for current amthif operation 406 * @iamthif_cl : amthif host client 407 * @iamthif_current_cb : amthif current operation callback 408 * @iamthif_open_count : number of opened amthif connections 409 * @iamthif_stall_timer : timer to detect amthif hang 410 * @iamthif_state : amthif processor state 411 * @iamthif_canceled : current amthif command is canceled 412 * 413 * @reset_work : work item for the device reset 414 * @bus_rescan_work : work item for the bus rescan 415 * 416 * @device_list : mei client bus list 417 * @cl_bus_lock : client bus list lock 418 * 419 * @dbgfs_dir : debugfs mei root directory 420 * 421 * @ops: : hw specific operations 422 * @hw : hw specific data 423 */ 424 struct mei_device { 425 struct device *dev; 426 struct cdev cdev; 427 int minor; 428 429 struct mei_cl_cb write_list; 430 struct mei_cl_cb write_waiting_list; 431 struct mei_cl_cb ctrl_wr_list; 432 struct mei_cl_cb ctrl_rd_list; 433 434 struct list_head file_list; 435 long open_handle_count; 436 437 struct mutex device_lock; 438 struct delayed_work timer_work; 439 440 bool recvd_hw_ready; 441 /* 442 * waiting queue for receive message from FW 443 */ 444 wait_queue_head_t wait_hw_ready; 445 wait_queue_head_t wait_pg; 446 wait_queue_head_t wait_hbm_start; 447 448 /* 449 * mei device states 450 */ 451 unsigned long reset_count; 452 enum mei_dev_state dev_state; 453 enum mei_hbm_state hbm_state; 454 u16 init_clients_timer; 455 456 /* 457 * Power Gating support 458 */ 459 enum mei_pg_event pg_event; 460 #ifdef CONFIG_PM 461 struct dev_pm_domain pg_domain; 462 #endif /* CONFIG_PM */ 463 464 unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; 465 u32 rd_msg_hdr; 466 467 /* write buffer */ 468 u8 hbuf_depth; 469 bool hbuf_is_ready; 470 471 /* used for control messages */ 472 struct { 473 struct mei_msg_hdr hdr; 474 unsigned char data[128]; 475 } wr_msg; 476 477 struct hbm_version version; 478 unsigned int hbm_f_pg_supported:1; 479 unsigned int hbm_f_dc_supported:1; 480 unsigned int hbm_f_dot_supported:1; 481 unsigned int hbm_f_ev_supported:1; 482 unsigned int hbm_f_fa_supported:1; 483 unsigned int hbm_f_ie_supported:1; 484 485 struct rw_semaphore me_clients_rwsem; 486 struct list_head me_clients; 487 DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX); 488 DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX); 489 unsigned long me_client_index; 490 491 bool allow_fixed_address; 492 bool override_fixed_address; 493 494 /* amthif list for cmd waiting */ 495 struct mei_cl_cb amthif_cmd_list; 496 /* driver managed amthif list for reading completed amthif cmd data */ 497 const struct file *iamthif_fp; 498 struct mei_cl iamthif_cl; 499 struct mei_cl_cb *iamthif_current_cb; 500 long iamthif_open_count; 501 u32 iamthif_stall_timer; 502 enum iamthif_states iamthif_state; 503 bool iamthif_canceled; 504 505 struct work_struct reset_work; 506 struct work_struct bus_rescan_work; 507 508 /* List of bus devices */ 509 struct list_head device_list; 510 struct mutex cl_bus_lock; 511 512 #if IS_ENABLED(CONFIG_DEBUG_FS) 513 struct dentry *dbgfs_dir; 514 #endif /* CONFIG_DEBUG_FS */ 515 516 517 const struct mei_hw_ops *ops; 518 char hw[0] __aligned(sizeof(void *)); 519 }; 520 521 static inline unsigned long mei_secs_to_jiffies(unsigned long sec) 522 { 523 return msecs_to_jiffies(sec * MSEC_PER_SEC); 524 } 525 526 /** 527 * mei_data2slots - get slots - number of (dwords) from a message length 528 * + size of the mei header 529 * 530 * @length: size of the messages in bytes 531 * 532 * Return: number of slots 533 */ 534 static inline u32 mei_data2slots(size_t length) 535 { 536 return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4); 537 } 538 539 /** 540 * mei_slots2data - get data in slots - bytes from slots 541 * 542 * @slots: number of available slots 543 * 544 * Return: number of bytes in slots 545 */ 546 static inline u32 mei_slots2data(int slots) 547 { 548 return slots * 4; 549 } 550 551 /* 552 * mei init function prototypes 553 */ 554 void mei_device_init(struct mei_device *dev, 555 struct device *device, 556 const struct mei_hw_ops *hw_ops); 557 int mei_reset(struct mei_device *dev); 558 int mei_start(struct mei_device *dev); 559 int mei_restart(struct mei_device *dev); 560 void mei_stop(struct mei_device *dev); 561 void mei_cancel_work(struct mei_device *dev); 562 563 /* 564 * MEI interrupt functions prototype 565 */ 566 567 void mei_timer(struct work_struct *work); 568 int mei_irq_read_handler(struct mei_device *dev, 569 struct mei_cl_cb *cmpl_list, s32 *slots); 570 571 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list); 572 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list); 573 574 /* 575 * AMTHIF - AMT Host Interface Functions 576 */ 577 void mei_amthif_reset_params(struct mei_device *dev); 578 579 int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl); 580 581 int mei_amthif_read(struct mei_device *dev, struct file *file, 582 char __user *ubuf, size_t length, loff_t *offset); 583 584 unsigned int mei_amthif_poll(struct mei_device *dev, 585 struct file *file, poll_table *wait); 586 587 int mei_amthif_release(struct mei_device *dev, struct file *file); 588 589 int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb); 590 int mei_amthif_run_next_cmd(struct mei_device *dev); 591 int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb, 592 struct mei_cl_cb *cmpl_list); 593 594 void mei_amthif_complete(struct mei_cl *cl, struct mei_cl_cb *cb); 595 int mei_amthif_irq_read_msg(struct mei_cl *cl, 596 struct mei_msg_hdr *mei_hdr, 597 struct mei_cl_cb *complete_list); 598 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots); 599 600 /* 601 * Register Access Function 602 */ 603 604 605 static inline void mei_hw_config(struct mei_device *dev) 606 { 607 dev->ops->hw_config(dev); 608 } 609 610 static inline enum mei_pg_state mei_pg_state(struct mei_device *dev) 611 { 612 return dev->ops->pg_state(dev); 613 } 614 615 static inline bool mei_pg_in_transition(struct mei_device *dev) 616 { 617 return dev->ops->pg_in_transition(dev); 618 } 619 620 static inline bool mei_pg_is_enabled(struct mei_device *dev) 621 { 622 return dev->ops->pg_is_enabled(dev); 623 } 624 625 static inline int mei_hw_reset(struct mei_device *dev, bool enable) 626 { 627 return dev->ops->hw_reset(dev, enable); 628 } 629 630 static inline int mei_hw_start(struct mei_device *dev) 631 { 632 return dev->ops->hw_start(dev); 633 } 634 635 static inline void mei_clear_interrupts(struct mei_device *dev) 636 { 637 dev->ops->intr_clear(dev); 638 } 639 640 static inline void mei_enable_interrupts(struct mei_device *dev) 641 { 642 dev->ops->intr_enable(dev); 643 } 644 645 static inline void mei_disable_interrupts(struct mei_device *dev) 646 { 647 dev->ops->intr_disable(dev); 648 } 649 650 static inline bool mei_host_is_ready(struct mei_device *dev) 651 { 652 return dev->ops->host_is_ready(dev); 653 } 654 static inline bool mei_hw_is_ready(struct mei_device *dev) 655 { 656 return dev->ops->hw_is_ready(dev); 657 } 658 659 static inline bool mei_hbuf_is_ready(struct mei_device *dev) 660 { 661 return dev->ops->hbuf_is_ready(dev); 662 } 663 664 static inline int mei_hbuf_empty_slots(struct mei_device *dev) 665 { 666 return dev->ops->hbuf_free_slots(dev); 667 } 668 669 static inline size_t mei_hbuf_max_len(const struct mei_device *dev) 670 { 671 return dev->ops->hbuf_max_len(dev); 672 } 673 674 static inline int mei_write_message(struct mei_device *dev, 675 struct mei_msg_hdr *hdr, 676 unsigned char *buf) 677 { 678 return dev->ops->write(dev, hdr, buf); 679 } 680 681 static inline u32 mei_read_hdr(const struct mei_device *dev) 682 { 683 return dev->ops->read_hdr(dev); 684 } 685 686 static inline void mei_read_slots(struct mei_device *dev, 687 unsigned char *buf, unsigned long len) 688 { 689 dev->ops->read(dev, buf, len); 690 } 691 692 static inline int mei_count_full_read_slots(struct mei_device *dev) 693 { 694 return dev->ops->rdbuf_full_slots(dev); 695 } 696 697 static inline int mei_fw_status(struct mei_device *dev, 698 struct mei_fw_status *fw_status) 699 { 700 return dev->ops->fw_status(dev, fw_status); 701 } 702 703 bool mei_hbuf_acquire(struct mei_device *dev); 704 705 bool mei_write_is_idle(struct mei_device *dev); 706 707 #if IS_ENABLED(CONFIG_DEBUG_FS) 708 int mei_dbgfs_register(struct mei_device *dev, const char *name); 709 void mei_dbgfs_deregister(struct mei_device *dev); 710 #else 711 static inline int mei_dbgfs_register(struct mei_device *dev, const char *name) 712 { 713 return 0; 714 } 715 static inline void mei_dbgfs_deregister(struct mei_device *dev) {} 716 #endif /* CONFIG_DEBUG_FS */ 717 718 int mei_register(struct mei_device *dev, struct device *parent); 719 void mei_deregister(struct mei_device *dev); 720 721 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d internal=%1d comp=%1d" 722 #define MEI_HDR_PRM(hdr) \ 723 (hdr)->host_addr, (hdr)->me_addr, \ 724 (hdr)->length, (hdr)->internal, (hdr)->msg_complete 725 726 ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len); 727 /** 728 * mei_fw_status_str - fetch and convert fw status registers to printable string 729 * 730 * @dev: the device structure 731 * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ 732 * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ 733 * 734 * Return: number of bytes written or < 0 on failure 735 */ 736 static inline ssize_t mei_fw_status_str(struct mei_device *dev, 737 char *buf, size_t len) 738 { 739 struct mei_fw_status fw_status; 740 int ret; 741 742 buf[0] = '\0'; 743 744 ret = mei_fw_status(dev, &fw_status); 745 if (ret) 746 return ret; 747 748 ret = mei_fw_status2str(&fw_status, buf, MEI_FW_STATUS_STR_SZ); 749 750 return ret; 751 } 752 753 754 #endif 755