drivers/misc/mei/mei_dev.h

   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  *
 400  * @allow_fixed_address: allow user space to connect a fixed client
 401  * @override_fixed_address: force allow fixed address behavior
 402  *
 403  * @amthif_cmd_list : amthif list for cmd waiting
 404  * @iamthif_fp : file for current amthif operation
 405  * @iamthif_cl  : amthif host client
 406  * @iamthif_current_cb : amthif current operation callback
 407  * @iamthif_open_count : number of opened amthif connections
 408  * @iamthif_stall_timer : timer to detect amthif hang
 409  * @iamthif_state : amthif processor state
 410  * @iamthif_canceled : current amthif command is canceled
 411  *
 412  * @reset_work  : work item for the device reset
 413  * @bus_rescan_work : work item for the bus rescan
 414  *
 415  * @device_list : mei client bus list
 416  * @cl_bus_lock : client bus list lock
 417  *
 418  * @dbgfs_dir   : debugfs mei root directory
 419  *
 420  * @ops:        : hw specific operations
 421  * @hw          : hw specific data
 422  */
 423 struct mei_device {
 424         struct device *dev;
 425         struct cdev cdev;
 426         int minor;
 427
 428         struct mei_cl_cb write_list;
 429         struct mei_cl_cb write_waiting_list;
 430         struct mei_cl_cb ctrl_wr_list;
 431         struct mei_cl_cb ctrl_rd_list;
 432
 433         struct list_head file_list;
 434         long open_handle_count;
 435
 436         struct mutex device_lock;
 437         struct delayed_work timer_work;
 438
 439         bool recvd_hw_ready;
 440         /*
 441          * waiting queue for receive message from FW
 442          */
 443         wait_queue_head_t wait_hw_ready;
 444         wait_queue_head_t wait_pg;
 445         wait_queue_head_t wait_hbm_start;
 446
 447         /*
 448          * mei device  states
 449          */
 450         unsigned long reset_count;
 451         enum mei_dev_state dev_state;
 452         enum mei_hbm_state hbm_state;
 453         u16 init_clients_timer;
 454
 455         /*
 456          * Power Gating support
 457          */
 458         enum mei_pg_event pg_event;
 459 #ifdef CONFIG_PM
 460         struct dev_pm_domain pg_domain;
 461 #endif /* CONFIG_PM */
 462
 463         unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];
 464         u32 rd_msg_hdr;
 465
 466         /* write buffer */
 467         u8 hbuf_depth;
 468         bool hbuf_is_ready;
 469
 470         /* used for control messages */
 471         struct {
 472                 struct mei_msg_hdr hdr;
 473                 unsigned char data[128];
 474         } wr_msg;
 475
 476         struct hbm_version version;
 477         unsigned int hbm_f_pg_supported:1;
 478         unsigned int hbm_f_dc_supported:1;
 479         unsigned int hbm_f_dot_supported:1;
 480         unsigned int hbm_f_ev_supported:1;
 481         unsigned int hbm_f_fa_supported:1;
 482         unsigned int hbm_f_ie_supported:1;
 483
 484         struct rw_semaphore me_clients_rwsem;
 485         struct list_head me_clients;
 486         DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
 487         DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
 488
 489         bool allow_fixed_address;
 490         bool override_fixed_address;
 491
 492         /* amthif list for cmd waiting */
 493         struct mei_cl_cb amthif_cmd_list;
 494         /* driver managed amthif list for reading completed amthif cmd data */
 495         const struct file *iamthif_fp;
 496         struct mei_cl iamthif_cl;
 497         struct mei_cl_cb *iamthif_current_cb;
 498         long iamthif_open_count;
 499         u32 iamthif_stall_timer;
 500         enum iamthif_states iamthif_state;
 501         bool iamthif_canceled;
 502
 503         struct work_struct reset_work;
 504         struct work_struct bus_rescan_work;
 505
 506         /* List of bus devices */
 507         struct list_head device_list;
 508         struct mutex cl_bus_lock;
 509
 510 #if IS_ENABLED(CONFIG_DEBUG_FS)
 511         struct dentry *dbgfs_dir;
 512 #endif /* CONFIG_DEBUG_FS */
 513
 514
 515         const struct mei_hw_ops *ops;
 516         char hw[0] __aligned(sizeof(void *));
 517 };
 518
 519 static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
 520 {
 521         return msecs_to_jiffies(sec * MSEC_PER_SEC);
 522 }
 523
 524 /**
 525  * mei_data2slots - get slots - number of (dwords) from a message length
 526  *      + size of the mei header
 527  *
 528  * @length: size of the messages in bytes
 529  *
 530  * Return: number of slots
 531  */
 532 static inline u32 mei_data2slots(size_t length)
 533 {
 534         return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
 535 }
 536
 537 /**
 538  * mei_slots2data - get data in slots - bytes from slots
 539  *
 540  * @slots: number of available slots
 541  *
 542  * Return: number of bytes in slots
 543  */
 544 static inline u32 mei_slots2data(int slots)
 545 {
 546         return slots * 4;
 547 }
 548
 549 /*
 550  * mei init function prototypes
 551  */
 552 void mei_device_init(struct mei_device *dev,
 553                      struct device *device,
 554                      const struct mei_hw_ops *hw_ops);
 555 int mei_reset(struct mei_device *dev);
 556 int mei_start(struct mei_device *dev);
 557 int mei_restart(struct mei_device *dev);
 558 void mei_stop(struct mei_device *dev);
 559 void mei_cancel_work(struct mei_device *dev);
 560
 561 /*
 562  *  MEI interrupt functions prototype
 563  */
 564
 565 void mei_timer(struct work_struct *work);
 566 int mei_irq_read_handler(struct mei_device *dev,
 567                 struct mei_cl_cb *cmpl_list, s32 *slots);
 568
 569 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
 570 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
 571
 572 /*
 573  * AMTHIF - AMT Host Interface Functions
 574  */
 575 void mei_amthif_reset_params(struct mei_device *dev);
 576
 577 int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl);
 578
 579 int mei_amthif_read(struct mei_device *dev, struct file *file,
 580                 char __user *ubuf, size_t length, loff_t *offset);
 581
 582 unsigned int mei_amthif_poll(struct mei_device *dev,
 583                 struct file *file, poll_table *wait);
 584
 585 int mei_amthif_release(struct mei_device *dev, struct file *file);
 586
 587 int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb);
 588 int mei_amthif_run_next_cmd(struct mei_device *dev);
 589 int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 590                         struct mei_cl_cb *cmpl_list);
 591
 592 void mei_amthif_complete(struct mei_cl *cl, struct mei_cl_cb *cb);
 593 int mei_amthif_irq_read_msg(struct mei_cl *cl,
 594                             struct mei_msg_hdr *mei_hdr,
 595                             struct mei_cl_cb *complete_list);
 596 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
 597
 598 /*
 599  * Register Access Function
 600  */
 601
 602
 603 static inline void mei_hw_config(struct mei_device *dev)
 604 {
 605         dev->ops->hw_config(dev);
 606 }
 607
 608 static inline enum mei_pg_state mei_pg_state(struct mei_device *dev)
 609 {
 610         return dev->ops->pg_state(dev);
 611 }
 612
 613 static inline bool mei_pg_in_transition(struct mei_device *dev)
 614 {
 615         return dev->ops->pg_in_transition(dev);
 616 }
 617
 618 static inline bool mei_pg_is_enabled(struct mei_device *dev)
 619 {
 620         return dev->ops->pg_is_enabled(dev);
 621 }
 622
 623 static inline int mei_hw_reset(struct mei_device *dev, bool enable)
 624 {
 625         return dev->ops->hw_reset(dev, enable);
 626 }
 627
 628 static inline int mei_hw_start(struct mei_device *dev)
 629 {
 630         return dev->ops->hw_start(dev);
 631 }
 632
 633 static inline void mei_clear_interrupts(struct mei_device *dev)
 634 {
 635         dev->ops->intr_clear(dev);
 636 }
 637
 638 static inline void mei_enable_interrupts(struct mei_device *dev)
 639 {
 640         dev->ops->intr_enable(dev);
 641 }
 642
 643 static inline void mei_disable_interrupts(struct mei_device *dev)
 644 {
 645         dev->ops->intr_disable(dev);
 646 }
 647
 648 static inline bool mei_host_is_ready(struct mei_device *dev)
 649 {
 650         return dev->ops->host_is_ready(dev);
 651 }
 652 static inline bool mei_hw_is_ready(struct mei_device *dev)
 653 {
 654         return dev->ops->hw_is_ready(dev);
 655 }
 656
 657 static inline bool mei_hbuf_is_ready(struct mei_device *dev)
 658 {
 659         return dev->ops->hbuf_is_ready(dev);
 660 }
 661
 662 static inline int mei_hbuf_empty_slots(struct mei_device *dev)
 663 {
 664         return dev->ops->hbuf_free_slots(dev);
 665 }
 666
 667 static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
 668 {
 669         return dev->ops->hbuf_max_len(dev);
 670 }
 671
 672 static inline int mei_write_message(struct mei_device *dev,
 673                         struct mei_msg_hdr *hdr,
 674                         unsigned char *buf)
 675 {
 676         return dev->ops->write(dev, hdr, buf);
 677 }
 678
 679 static inline u32 mei_read_hdr(const struct mei_device *dev)
 680 {
 681         return dev->ops->read_hdr(dev);
 682 }
 683
 684 static inline void mei_read_slots(struct mei_device *dev,
 685                      unsigned char *buf, unsigned long len)
 686 {
 687         dev->ops->read(dev, buf, len);
 688 }
 689
 690 static inline int mei_count_full_read_slots(struct mei_device *dev)
 691 {
 692         return dev->ops->rdbuf_full_slots(dev);
 693 }
 694
 695 static inline int mei_fw_status(struct mei_device *dev,
 696                                 struct mei_fw_status *fw_status)
 697 {
 698         return dev->ops->fw_status(dev, fw_status);
 699 }
 700
 701 bool mei_hbuf_acquire(struct mei_device *dev);
 702
 703 bool mei_write_is_idle(struct mei_device *dev);
 704
 705 void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr);
 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