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/watchdog.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  * watch dog definition
  31  */
  32 #define MEI_WD_HDR_SIZE       4
  33 #define MEI_WD_STOP_MSG_SIZE  MEI_WD_HDR_SIZE
  34 #define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16)
  35
  36 #define MEI_WD_DEFAULT_TIMEOUT   120  /* seconds */
  37 #define MEI_WD_MIN_TIMEOUT       120  /* seconds */
  38 #define MEI_WD_MAX_TIMEOUT     65535  /* seconds */
  39
  40 #define MEI_WD_STOP_TIMEOUT      10 /* msecs */
  41
  42 #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT       (1 << 0)
  43
  44 #define MEI_RD_MSG_BUF_SIZE           (128 * sizeof(u32))
  45
  46
  47 /*
  48  * AMTHI Client UUID
  49  */
  50 extern const uuid_le mei_amthif_guid;
  51
  52 /*
  53  * Watchdog Client UUID
  54  */
  55 extern const uuid_le mei_wd_guid;
  56
  57 /*
  58  * Number of Maximum MEI Clients
  59  */
  60 #define MEI_CLIENTS_MAX 256
  61
  62 /*
  63  * maximum number of consecutive resets
  64  */
  65 #define MEI_MAX_CONSEC_RESET  3
  66
  67 /*
  68  * Number of File descriptors/handles
  69  * that can be opened to the driver.
  70  *
  71  * Limit to 255: 256 Total Clients
  72  * minus internal client for MEI Bus Messages
  73  */
  74 #define  MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
  75
  76 /*
  77  * Internal Clients Number
  78  */
  79 #define MEI_HOST_CLIENT_ID_ANY        (-1)
  80 #define MEI_HBM_HOST_CLIENT_ID         0 /* not used, just for documentation */
  81 #define MEI_WD_HOST_CLIENT_ID          1
  82 #define MEI_IAMTHIF_HOST_CLIENT_ID     2
  83
  84
  85 /* File state */
  86 enum file_state {
  87         MEI_FILE_INITIALIZING = 0,
  88         MEI_FILE_CONNECTING,
  89         MEI_FILE_CONNECTED,
  90         MEI_FILE_DISCONNECTING,
  91         MEI_FILE_DISCONNECTED
  92 };
  93
  94 /* MEI device states */
  95 enum mei_dev_state {
  96         MEI_DEV_INITIALIZING = 0,
  97         MEI_DEV_INIT_CLIENTS,
  98         MEI_DEV_ENABLED,
  99         MEI_DEV_RESETTING,
 100         MEI_DEV_DISABLED,
 101         MEI_DEV_POWER_DOWN,
 102         MEI_DEV_POWER_UP
 103 };
 104
 105 const char *mei_dev_state_str(int state);
 106
 107 enum iamthif_states {
 108         MEI_IAMTHIF_IDLE,
 109         MEI_IAMTHIF_WRITING,
 110         MEI_IAMTHIF_FLOW_CONTROL,
 111         MEI_IAMTHIF_READING,
 112         MEI_IAMTHIF_READ_COMPLETE
 113 };
 114
 115 enum mei_file_transaction_states {
 116         MEI_IDLE,
 117         MEI_WRITING,
 118         MEI_WRITE_COMPLETE,
 119         MEI_FLOW_CONTROL,
 120         MEI_READING,
 121         MEI_READ_COMPLETE
 122 };
 123
 124 enum mei_wd_states {
 125         MEI_WD_IDLE,
 126         MEI_WD_RUNNING,
 127         MEI_WD_STOPPING,
 128 };
 129
 130 /**
 131  * enum mei_cb_file_ops  - file operation associated with the callback
 132  * @MEI_FOP_READ:       read
 133  * @MEI_FOP_WRITE:      write
 134  * @MEI_FOP_CONNECT:    connect
 135  * @MEI_FOP_DISCONNECT: disconnect
 136  * @MEI_FOP_DISCONNECT_RSP: disconnect response
 137  */
 138 enum mei_cb_file_ops {
 139         MEI_FOP_READ = 0,
 140         MEI_FOP_WRITE,
 141         MEI_FOP_CONNECT,
 142         MEI_FOP_DISCONNECT,
 143         MEI_FOP_DISCONNECT_RSP,
 144 };
 145
 146 /*
 147  * Intel MEI message data struct
 148  */
 149 struct mei_msg_data {
 150         u32 size;
 151         unsigned char *data;
 152 };
 153
 154 /* Maximum number of processed FW status registers */
 155 #define MEI_FW_STATUS_MAX 6
 156 /* Minimal  buffer for FW status string (8 bytes in dw + space or '\0') */
 157 #define MEI_FW_STATUS_STR_SZ (MEI_FW_STATUS_MAX * (8 + 1))
 158
 159
 160 /*
 161  * struct mei_fw_status - storage of FW status data
 162  *
 163  * @count: number of actually available elements in array
 164  * @status: FW status registers
 165  */
 166 struct mei_fw_status {
 167         int count;
 168         u32 status[MEI_FW_STATUS_MAX];
 169 };
 170
 171 /**
 172  * struct mei_me_client - representation of me (fw) client
 173  *
 174  * @list: link in me client list
 175  * @refcnt: struct reference count
 176  * @props: client properties
 177  * @client_id: me client id
 178  * @mei_flow_ctrl_creds: flow control credits
 179  */
 180 struct mei_me_client {
 181         struct list_head list;
 182         struct kref refcnt;
 183         struct mei_client_properties props;
 184         u8 client_id;
 185         u8 mei_flow_ctrl_creds;
 186 };
 187
 188
 189 struct mei_cl;
 190
 191 /**
 192  * struct mei_cl_cb - file operation callback structure
 193  *
 194  * @list: link in callback queue
 195  * @cl: file client who is running this operation
 196  * @fop_type: file operation type
 197  * @request_buffer: buffer to store request data
 198  * @response_buffer: buffer to store response data
 199  * @buf_idx: last read index
 200  * @read_time: last read operation time stamp (iamthif)
 201  * @file_object: pointer to file structure
 202  * @internal: communication between driver and FW flag
 203  */
 204 struct mei_cl_cb {
 205         struct list_head list;
 206         struct mei_cl *cl;
 207         enum mei_cb_file_ops fop_type;
 208         struct mei_msg_data request_buffer;
 209         struct mei_msg_data response_buffer;
 210         unsigned long buf_idx;
 211         unsigned long read_time;
 212         struct file *file_object;
 213         u32 internal:1;
 214 };
 215
 216 /**
 217  * struct mei_cl - me client host representation
 218  *    carried in file->private_data
 219  *
 220  * @link: link in the clients list
 221  * @dev: mei parent device
 222  * @state: file operation state
 223  * @tx_wait: wait queue for tx completion
 224  * @rx_wait: wait queue for rx completion
 225  * @wait:  wait queue for management operation
 226  * @status: connection status
 227  * @cl_uuid: client uuid name
 228  * @host_client_id: host id
 229  * @me_client_id: me/fw id
 230  * @mei_flow_ctrl_creds: transmit flow credentials
 231  * @timer_count:  watchdog timer for operation completion
 232  * @reading_state: state of the rx
 233  * @writing_state: state of the tx
 234  * @read_cb: current pending reading callback
 235  *
 236  * @device: device on the mei client bus
 237  * @device_link:  link to bus clients
 238  */
 239 struct mei_cl {
 240         struct list_head link;
 241         struct mei_device *dev;
 242         enum file_state state;
 243         wait_queue_head_t tx_wait;
 244         wait_queue_head_t rx_wait;
 245         wait_queue_head_t wait;
 246         int status;
 247         uuid_le cl_uuid;
 248         u8 host_client_id;
 249         u8 me_client_id;
 250         u8 mei_flow_ctrl_creds;
 251         u8 timer_count;
 252         enum mei_file_transaction_states reading_state;
 253         enum mei_file_transaction_states writing_state;
 254         struct mei_cl_cb *read_cb;
 255
 256         /* MEI CL bus data */
 257         struct mei_cl_device *device;
 258         struct list_head device_link;
 259 };
 260
 261 /** struct mei_hw_ops
 262  *
 263  * @host_is_ready    : query for host readiness
 264
 265  * @hw_is_ready      : query if hw is ready
 266  * @hw_reset         : reset hw
 267  * @hw_start         : start hw after reset
 268  * @hw_config        : configure hw
 269
 270  * @fw_status        : get fw status registers
 271  * @pg_state         : power gating state of the device
 272  * @pg_is_enabled    : is power gating enabled
 273
 274  * @intr_clear       : clear pending interrupts
 275  * @intr_enable      : enable interrupts
 276  * @intr_disable     : disable interrupts
 277
 278  * @hbuf_free_slots  : query for write buffer empty slots
 279  * @hbuf_is_ready    : query if write buffer is empty
 280  * @hbuf_max_len     : query for write buffer max len
 281
 282  * @write            : write a message to FW
 283
 284  * @rdbuf_full_slots : query how many slots are filled
 285
 286  * @read_hdr         : get first 4 bytes (header)
 287  * @read             : read a buffer from the FW
 288  */
 289 struct mei_hw_ops {
 290
 291         bool (*host_is_ready)(struct mei_device *dev);
 292
 293         bool (*hw_is_ready)(struct mei_device *dev);
 294         int (*hw_reset)(struct mei_device *dev, bool enable);
 295         int (*hw_start)(struct mei_device *dev);
 296         void (*hw_config)(struct mei_device *dev);
 297
 298
 299         int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts);
 300         enum mei_pg_state (*pg_state)(struct mei_device *dev);
 301         bool (*pg_is_enabled)(struct mei_device *dev);
 302
 303         void (*intr_clear)(struct mei_device *dev);
 304         void (*intr_enable)(struct mei_device *dev);
 305         void (*intr_disable)(struct mei_device *dev);
 306
 307         int (*hbuf_free_slots)(struct mei_device *dev);
 308         bool (*hbuf_is_ready)(struct mei_device *dev);
 309         size_t (*hbuf_max_len)(const struct mei_device *dev);
 310
 311         int (*write)(struct mei_device *dev,
 312                      struct mei_msg_hdr *hdr,
 313                      unsigned char *buf);
 314
 315         int (*rdbuf_full_slots)(struct mei_device *dev);
 316
 317         u32 (*read_hdr)(const struct mei_device *dev);
 318         int (*read)(struct mei_device *dev,
 319                      unsigned char *buf, unsigned long len);
 320 };
 321
 322 /* MEI bus API*/
 323
 324 /**
 325  * struct mei_cl_ops - MEI CL device ops
 326  * This structure allows ME host clients to implement technology
 327  * specific operations.
 328  *
 329  * @enable: Enable an MEI CL device. Some devices require specific
 330  *      HECI commands to initialize completely.
 331  * @disable: Disable an MEI CL device.
 332  * @send: Tx hook for the device. This allows ME host clients to trap
 333  *      the device driver buffers before actually physically
 334  *      pushing it to the ME.
 335  * @recv: Rx hook for the device. This allows ME host clients to trap the
 336  *      ME buffers before forwarding them to the device driver.
 337  */
 338 struct mei_cl_ops {
 339         int (*enable)(struct mei_cl_device *device);
 340         int (*disable)(struct mei_cl_device *device);
 341         int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
 342         int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
 343 };
 344
 345 struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
 346                                         uuid_le uuid, char *name,
 347                                         struct mei_cl_ops *ops);
 348 void mei_cl_remove_device(struct mei_cl_device *device);
 349
 350 ssize_t __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
 351 ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
 352 ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
 353 void mei_cl_bus_rx_event(struct mei_cl *cl);
 354 void mei_cl_bus_remove_devices(struct mei_device *dev);
 355 int mei_cl_bus_init(void);
 356 void mei_cl_bus_exit(void);
 357 struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev, uuid_le uuid);
 358
 359
 360 /**
 361  * struct mei_cl_device - MEI device handle
 362  * An mei_cl_device pointer is returned from mei_add_device()
 363  * and links MEI bus clients to their actual ME host client pointer.
 364  * Drivers for MEI devices will get an mei_cl_device pointer
 365  * when being probed and shall use it for doing ME bus I/O.
 366  *
 367  * @dev: linux driver model device pointer
 368  * @cl: mei client
 369  * @ops: ME transport ops
 370  * @event_work: async work to execute event callback
 371  * @event_cb: Drivers register this callback to get asynchronous ME
 372  *      events (e.g. Rx buffer pending) notifications.
 373  * @event_context: event callback run context
 374  * @events: Events bitmask sent to the driver.
 375  * @priv_data: client private data
 376  */
 377 struct mei_cl_device {
 378         struct device dev;
 379
 380         struct mei_cl *cl;
 381
 382         const struct mei_cl_ops *ops;
 383
 384         struct work_struct event_work;
 385         mei_cl_event_cb_t event_cb;
 386         void *event_context;
 387         unsigned long events;
 388
 389         void *priv_data;
 390 };
 391
 392
 393 /**
 394  * enum mei_pg_event - power gating transition events
 395  *
 396  * @MEI_PG_EVENT_IDLE: the driver is not in power gating transition
 397  * @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete
 398  * @MEI_PG_EVENT_RECEIVED: the driver received pg event
 399  */
 400 enum mei_pg_event {
 401         MEI_PG_EVENT_IDLE,
 402         MEI_PG_EVENT_WAIT,
 403         MEI_PG_EVENT_RECEIVED,
 404 };
 405
 406 /**
 407  * enum mei_pg_state - device internal power gating state
 408  *
 409  * @MEI_PG_OFF: device is not power gated - it is active
 410  * @MEI_PG_ON:  device is power gated - it is in lower power state
 411  */
 412 enum mei_pg_state {
 413         MEI_PG_OFF = 0,
 414         MEI_PG_ON =  1,
 415 };
 416
 417 const char *mei_pg_state_str(enum mei_pg_state state);
 418
 419 /**
 420  * struct mei_device -  MEI private device struct
 421  *
 422  * @dev         : device on a bus
 423  * @cdev        : character device
 424  * @minor       : minor number allocated for device
 425  *
 426  * @read_list   : read completion list
 427  * @write_list  : write pending list
 428  * @write_waiting_list : write completion list
 429  * @ctrl_wr_list : pending control write list
 430  * @ctrl_rd_list : pending control read list
 431  *
 432  * @file_list   : list of opened handles
 433  * @open_handle_count: number of opened handles
 434  *
 435  * @device_lock : big device lock
 436  * @timer_work  : MEI timer delayed work (timeouts)
 437  *
 438  * @recvd_hw_ready : hw ready message received flag
 439  *
 440  * @wait_hw_ready : wait queue for receive HW ready message form FW
 441  * @wait_pg     : wait queue for receive PG message from FW
 442  * @wait_hbm_start : wait queue for receive HBM start message from FW
 443  * @wait_stop_wd : wait queue for receive WD stop message from FW
 444  *
 445  * @reset_count : number of consecutive resets
 446  * @dev_state   : device state
 447  * @hbm_state   : state of host bus message protocol
 448  * @init_clients_timer : HBM init handshake timeout
 449  *
 450  * @pg_event    : power gating event
 451  * @pg_domain   : runtime PM domain
 452  *
 453  * @rd_msg_buf  : control messages buffer
 454  * @rd_msg_hdr  : read message header storage
 455  *
 456  * @hbuf_depth  : depth of hardware host/write buffer is slots
 457  * @hbuf_is_ready : query if the host host/write buffer is ready
 458  * @wr_msg      : the buffer for hbm control messages
 459  *
 460  * @version     : HBM protocol version in use
 461  * @hbm_f_pg_supported : hbm feature pgi protocol
 462  *
 463  * @me_clients  : list of FW clients
 464  * @me_clients_map : FW clients bit map
 465  * @host_clients_map : host clients id pool
 466  * @me_client_index : last FW client index in enumeration
 467  *
 468  * @wd_cl       : watchdog client
 469  * @wd_state    : watchdog client state
 470  * @wd_pending  : watchdog command is pending
 471  * @wd_timeout  : watchdog expiration timeout
 472  * @wd_data     : watchdog message buffer
 473  *
 474  * @amthif_cmd_list : amthif list for cmd waiting
 475  * @amthif_rd_complete_list : amthif list for reading completed cmd data
 476  * @iamthif_file_object : file for current amthif operation
 477  * @iamthif_cl  : amthif host client
 478  * @iamthif_current_cb : amthif current operation callback
 479  * @iamthif_open_count : number of opened amthif connections
 480  * @iamthif_mtu : amthif client max message length
 481  * @iamthif_timer : time stamp of current amthif command completion
 482  * @iamthif_stall_timer : timer to detect amthif hang
 483  * @iamthif_msg_buf : amthif current message buffer
 484  * @iamthif_msg_buf_size : size of current amthif message request buffer
 485  * @iamthif_msg_buf_index : current index in amthif message request buffer
 486  * @iamthif_state : amthif processor state
 487  * @iamthif_flow_control_pending: amthif waits for flow control
 488  * @iamthif_ioctl : wait for completion if amthif control message
 489  * @iamthif_canceled : current amthif command is canceled
 490  *
 491  * @init_work   : work item for the device init
 492  * @reset_work  : work item for the device reset
 493  *
 494  * @device_list : mei client bus list
 495  *
 496  * @dbgfs_dir   : debugfs mei root directory
 497  *
 498  * @ops:        : hw specific operations
 499  * @hw          : hw specific data
 500  */
 501 struct mei_device {
 502         struct device *dev;
 503         struct cdev cdev;
 504         int minor;
 505
 506         struct mei_cl_cb read_list;
 507         struct mei_cl_cb write_list;
 508         struct mei_cl_cb write_waiting_list;
 509         struct mei_cl_cb ctrl_wr_list;
 510         struct mei_cl_cb ctrl_rd_list;
 511
 512         struct list_head file_list;
 513         long open_handle_count;
 514
 515         struct mutex device_lock;
 516         struct delayed_work timer_work;
 517
 518         bool recvd_hw_ready;
 519         /*
 520          * waiting queue for receive message from FW
 521          */
 522         wait_queue_head_t wait_hw_ready;
 523         wait_queue_head_t wait_pg;
 524         wait_queue_head_t wait_hbm_start;
 525         wait_queue_head_t wait_stop_wd;
 526
 527         /*
 528          * mei device  states
 529          */
 530         unsigned long reset_count;
 531         enum mei_dev_state dev_state;
 532         enum mei_hbm_state hbm_state;
 533         u16 init_clients_timer;
 534
 535         /*
 536          * Power Gating support
 537          */
 538         enum mei_pg_event pg_event;
 539 #ifdef CONFIG_PM
 540         struct dev_pm_domain pg_domain;
 541 #endif /* CONFIG_PM */
 542
 543         unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];
 544         u32 rd_msg_hdr;
 545
 546         /* write buffer */
 547         u8 hbuf_depth;
 548         bool hbuf_is_ready;
 549
 550         /* used for control messages */
 551         struct {
 552                 struct mei_msg_hdr hdr;
 553                 unsigned char data[128];
 554         } wr_msg;
 555
 556         struct hbm_version version;
 557         unsigned int hbm_f_pg_supported:1;
 558
 559         struct list_head me_clients;
 560         DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
 561         DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
 562         unsigned long me_client_index;
 563
 564         struct mei_cl wd_cl;
 565         enum mei_wd_states wd_state;
 566         bool wd_pending;
 567         u16 wd_timeout;
 568         unsigned char wd_data[MEI_WD_START_MSG_SIZE];
 569
 570
 571         /* amthif list for cmd waiting */
 572         struct mei_cl_cb amthif_cmd_list;
 573         /* driver managed amthif list for reading completed amthif cmd data */
 574         struct mei_cl_cb amthif_rd_complete_list;
 575         struct file *iamthif_file_object;
 576         struct mei_cl iamthif_cl;
 577         struct mei_cl_cb *iamthif_current_cb;
 578         long iamthif_open_count;
 579         int iamthif_mtu;
 580         unsigned long iamthif_timer;
 581         u32 iamthif_stall_timer;
 582         unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
 583         u32 iamthif_msg_buf_size;
 584         u32 iamthif_msg_buf_index;
 585         enum iamthif_states iamthif_state;
 586         bool iamthif_flow_control_pending;
 587         bool iamthif_ioctl;
 588         bool iamthif_canceled;
 589
 590         struct work_struct init_work;
 591         struct work_struct reset_work;
 592
 593         /* List of bus devices */
 594         struct list_head device_list;
 595
 596 #if IS_ENABLED(CONFIG_DEBUG_FS)
 597         struct dentry *dbgfs_dir;
 598 #endif /* CONFIG_DEBUG_FS */
 599
 600
 601         const struct mei_hw_ops *ops;
 602         char hw[0] __aligned(sizeof(void *));
 603 };
 604
 605 static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
 606 {
 607         return msecs_to_jiffies(sec * MSEC_PER_SEC);
 608 }
 609
 610 /**
 611  * mei_data2slots - get slots - number of (dwords) from a message length
 612  *      + size of the mei header
 613  *
 614  * @length: size of the messages in bytes
 615  *
 616  * Return: number of slots
 617  */
 618 static inline u32 mei_data2slots(size_t length)
 619 {
 620         return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
 621 }
 622
 623 /**
 624  * mei_slots2data - get data in slots - bytes from slots
 625  *
 626  * @slots: number of available slots
 627  *
 628  * Return: number of bytes in slots
 629  */
 630 static inline u32 mei_slots2data(int slots)
 631 {
 632         return slots * 4;
 633 }
 634
 635 /*
 636  * mei init function prototypes
 637  */
 638 void mei_device_init(struct mei_device *dev,
 639                      struct device *device,
 640                      const struct mei_hw_ops *hw_ops);
 641 int mei_reset(struct mei_device *dev);
 642 int mei_start(struct mei_device *dev);
 643 int mei_restart(struct mei_device *dev);
 644 void mei_stop(struct mei_device *dev);
 645 void mei_cancel_work(struct mei_device *dev);
 646
 647 /*
 648  *  MEI interrupt functions prototype
 649  */
 650
 651 void mei_timer(struct work_struct *work);
 652 int mei_irq_read_handler(struct mei_device *dev,
 653                 struct mei_cl_cb *cmpl_list, s32 *slots);
 654
 655 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
 656 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
 657
 658 /*
 659  * AMTHIF - AMT Host Interface Functions
 660  */
 661 void mei_amthif_reset_params(struct mei_device *dev);
 662
 663 int mei_amthif_host_init(struct mei_device *dev);
 664
 665 int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
 666
 667 int mei_amthif_read(struct mei_device *dev, struct file *file,
 668                 char __user *ubuf, size_t length, loff_t *offset);
 669
 670 unsigned int mei_amthif_poll(struct mei_device *dev,
 671                 struct file *file, poll_table *wait);
 672
 673 int mei_amthif_release(struct mei_device *dev, struct file *file);
 674
 675 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
 676                                                 struct file *file);
 677
 678 void mei_amthif_run_next_cmd(struct mei_device *dev);
 679
 680 int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 681                         struct mei_cl_cb *cmpl_list);
 682
 683 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
 684 int mei_amthif_irq_read_msg(struct mei_device *dev,
 685                             struct mei_msg_hdr *mei_hdr,
 686                             struct mei_cl_cb *complete_list);
 687 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
 688
 689 /*
 690  * NFC functions
 691  */
 692 int mei_nfc_host_init(struct mei_device *dev);
 693 void mei_nfc_host_exit(struct mei_device *dev);
 694
 695 /*
 696  * NFC Client UUID
 697  */
 698 extern const uuid_le mei_nfc_guid;
 699
 700 int mei_wd_send(struct mei_device *dev);
 701 int mei_wd_stop(struct mei_device *dev);
 702 int mei_wd_host_init(struct mei_device *dev);
 703 /*
 704  * mei_watchdog_register  - Registering watchdog interface
 705  *   once we got connection to the WD Client
 706  * @dev: mei device
 707  */
 708 int mei_watchdog_register(struct mei_device *dev);
 709 /*
 710  * mei_watchdog_unregister  - Unregistering watchdog interface
 711  * @dev: mei device
 712  */
 713 void mei_watchdog_unregister(struct mei_device *dev);
 714
 715 /*
 716  * Register Access Function
 717  */
 718
 719
 720 static inline void mei_hw_config(struct mei_device *dev)
 721 {
 722         dev->ops->hw_config(dev);
 723 }
 724
 725 static inline enum mei_pg_state mei_pg_state(struct mei_device *dev)
 726 {
 727         return dev->ops->pg_state(dev);
 728 }
 729
 730 static inline bool mei_pg_is_enabled(struct mei_device *dev)
 731 {
 732         return dev->ops->pg_is_enabled(dev);
 733 }
 734
 735 static inline int mei_hw_reset(struct mei_device *dev, bool enable)
 736 {
 737         return dev->ops->hw_reset(dev, enable);
 738 }
 739
 740 static inline int mei_hw_start(struct mei_device *dev)
 741 {
 742         return dev->ops->hw_start(dev);
 743 }
 744
 745 static inline void mei_clear_interrupts(struct mei_device *dev)
 746 {
 747         dev->ops->intr_clear(dev);
 748 }
 749
 750 static inline void mei_enable_interrupts(struct mei_device *dev)
 751 {
 752         dev->ops->intr_enable(dev);
 753 }
 754
 755 static inline void mei_disable_interrupts(struct mei_device *dev)
 756 {
 757         dev->ops->intr_disable(dev);
 758 }
 759
 760 static inline bool mei_host_is_ready(struct mei_device *dev)
 761 {
 762         return dev->ops->host_is_ready(dev);
 763 }
 764 static inline bool mei_hw_is_ready(struct mei_device *dev)
 765 {
 766         return dev->ops->hw_is_ready(dev);
 767 }
 768
 769 static inline bool mei_hbuf_is_ready(struct mei_device *dev)
 770 {
 771         return dev->ops->hbuf_is_ready(dev);
 772 }
 773
 774 static inline int mei_hbuf_empty_slots(struct mei_device *dev)
 775 {
 776         return dev->ops->hbuf_free_slots(dev);
 777 }
 778
 779 static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
 780 {
 781         return dev->ops->hbuf_max_len(dev);
 782 }
 783
 784 static inline int mei_write_message(struct mei_device *dev,
 785                         struct mei_msg_hdr *hdr,
 786                         unsigned char *buf)
 787 {
 788         return dev->ops->write(dev, hdr, buf);
 789 }
 790
 791 static inline u32 mei_read_hdr(const struct mei_device *dev)
 792 {
 793         return dev->ops->read_hdr(dev);
 794 }
 795
 796 static inline void mei_read_slots(struct mei_device *dev,
 797                      unsigned char *buf, unsigned long len)
 798 {
 799         dev->ops->read(dev, buf, len);
 800 }
 801
 802 static inline int mei_count_full_read_slots(struct mei_device *dev)
 803 {
 804         return dev->ops->rdbuf_full_slots(dev);
 805 }
 806
 807 static inline int mei_fw_status(struct mei_device *dev,
 808                                 struct mei_fw_status *fw_status)
 809 {
 810         return dev->ops->fw_status(dev, fw_status);
 811 }
 812
 813 bool mei_hbuf_acquire(struct mei_device *dev);
 814
 815 bool mei_write_is_idle(struct mei_device *dev);
 816
 817 #if IS_ENABLED(CONFIG_DEBUG_FS)
 818 int mei_dbgfs_register(struct mei_device *dev, const char *name);
 819 void mei_dbgfs_deregister(struct mei_device *dev);
 820 #else
 821 static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
 822 {
 823         return 0;
 824 }
 825 static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
 826 #endif /* CONFIG_DEBUG_FS */
 827
 828 int mei_register(struct mei_device *dev, struct device *parent);
 829 void mei_deregister(struct mei_device *dev);
 830
 831 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d internal=%1d comp=%1d"
 832 #define MEI_HDR_PRM(hdr)                  \
 833         (hdr)->host_addr, (hdr)->me_addr, \
 834         (hdr)->length, (hdr)->internal, (hdr)->msg_complete
 835
 836 ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len);
 837 /**
 838  * mei_fw_status_str - fetch and convert fw status registers to printable string
 839  *
 840  * @dev: the device structure
 841  * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ
 842  * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ
 843  *
 844  * Return: number of bytes written or < 0 on failure
 845  */
 846 static inline ssize_t mei_fw_status_str(struct mei_device *dev,
 847                                         char *buf, size_t len)
 848 {
 849         struct mei_fw_status fw_status;
 850         int ret;
 851
 852         buf[0] = '\0';
 853
 854         ret = mei_fw_status(dev, &fw_status);
 855         if (ret)
 856                 return ret;
 857
 858         ret = mei_fw_status2str(&fw_status, buf, MEI_FW_STATUS_STR_SZ);
 859
 860         return ret;
 861 }
 862
 863
 864 #endif