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