linux/drivers/misc/mei/hdcp/mei_hdcp.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright \xC2\xA9 2019 Intel Corporation
   4 *
   5 * mei_hdcp.c: HDCP client driver for mei bus
   6 *
   7 * Author:
   8 * Ramalingam C <ramalingam.c@intel.com>
   9 */
  10
  11/**
  12 * DOC: MEI_HDCP Client Driver
  13 *
  14 * The mei_hdcp driver acts as a translation layer between HDCP 2.2
  15 * protocol  implementer (I915) and ME FW by translating HDCP2.2
  16 * negotiation messages to ME FW command payloads and vice versa.
  17 */
  18
  19#include <linux/module.h>
  20#include <linux/slab.h>
  21#include <linux/uuid.h>
  22#include <linux/mei_cl_bus.h>
  23#include <linux/component.h>
  24#include <drm/drm_connector.h>
  25#include <drm/i915_component.h>
  26#include <drm/i915_mei_hdcp_interface.h>
  27
  28#include "mei_hdcp.h"
  29
  30/**
  31 * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW
  32 * @dev: device corresponding to the mei_cl_device
  33 * @data: Intel HW specific hdcp data
  34 * @ake_data: AKE_Init msg output.
  35 *
  36 * Return:  0 on Success, <0 on Failure.
  37 */
  38static int
  39mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
  40                          struct hdcp2_ake_init *ake_data)
  41{
  42        struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
  43        struct wired_cmd_initiate_hdcp2_session_out
  44                                                session_init_out = { { 0 } };
  45        struct mei_cl_device *cldev;
  46        ssize_t byte;
  47
  48        if (!dev || !data || !ake_data)
  49                return -EINVAL;
  50
  51        cldev = to_mei_cl_device(dev);
  52
  53        session_init_in.header.api_version = HDCP_API_VERSION;
  54        session_init_in.header.command_id = WIRED_INITIATE_HDCP2_SESSION;
  55        session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
  56        session_init_in.header.buffer_len =
  57                                WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
  58
  59        session_init_in.port.integrated_port_type = data->port_type;
  60        session_init_in.port.physical_port = (u8)data->fw_ddi;
  61        session_init_in.port.attached_transcoder = (u8)data->fw_tc;
  62        session_init_in.protocol = data->protocol;
  63
  64        byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
  65                              sizeof(session_init_in));
  66        if (byte < 0) {
  67                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
  68                return byte;
  69        }
  70
  71        byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
  72                              sizeof(session_init_out));
  73        if (byte < 0) {
  74                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
  75                return byte;
  76        }
  77
  78        if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
  79                dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
  80                        WIRED_INITIATE_HDCP2_SESSION,
  81                        session_init_out.header.status);
  82                return -EIO;
  83        }
  84
  85        ake_data->msg_id = HDCP_2_2_AKE_INIT;
  86        ake_data->tx_caps = session_init_out.tx_caps;
  87        memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);
  88
  89        return 0;
  90}
  91
  92/**
  93 * mei_hdcp_verify_receiver_cert_prepare_km() - Verify the Receiver Certificate
  94 * AKE_Send_Cert and prepare AKE_Stored_Km/AKE_No_Stored_Km
  95 * @dev: device corresponding to the mei_cl_device
  96 * @data: Intel HW specific hdcp data
  97 * @rx_cert: AKE_Send_Cert for verification
  98 * @km_stored: Pairing status flag output
  99 * @ek_pub_km: AKE_Stored_Km/AKE_No_Stored_Km output msg
 100 * @msg_sz : size of AKE_XXXXX_Km output msg
 101 *
 102 * Return: 0 on Success, <0 on Failure
 103 */
 104static int
 105mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev,
 106                                         struct hdcp_port_data *data,
 107                                         struct hdcp2_ake_send_cert *rx_cert,
 108                                         bool *km_stored,
 109                                         struct hdcp2_ake_no_stored_km
 110                                                                *ek_pub_km,
 111                                         size_t *msg_sz)
 112{
 113        struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } };
 114        struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } };
 115        struct mei_cl_device *cldev;
 116        ssize_t byte;
 117
 118        if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
 119                return -EINVAL;
 120
 121        cldev = to_mei_cl_device(dev);
 122
 123        verify_rxcert_in.header.api_version = HDCP_API_VERSION;
 124        verify_rxcert_in.header.command_id = WIRED_VERIFY_RECEIVER_CERT;
 125        verify_rxcert_in.header.status = ME_HDCP_STATUS_SUCCESS;
 126        verify_rxcert_in.header.buffer_len =
 127                                WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN;
 128
 129        verify_rxcert_in.port.integrated_port_type = data->port_type;
 130        verify_rxcert_in.port.physical_port = (u8)data->fw_ddi;
 131        verify_rxcert_in.port.attached_transcoder = (u8)data->fw_tc;
 132
 133        verify_rxcert_in.cert_rx = rx_cert->cert_rx;
 134        memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN);
 135        memcpy(verify_rxcert_in.rx_caps, rx_cert->rx_caps, HDCP_2_2_RXCAPS_LEN);
 136
 137        byte = mei_cldev_send(cldev, (u8 *)&verify_rxcert_in,
 138                              sizeof(verify_rxcert_in));
 139        if (byte < 0) {
 140                dev_dbg(dev, "mei_cldev_send failed: %zd\n", byte);
 141                return byte;
 142        }
 143
 144        byte = mei_cldev_recv(cldev, (u8 *)&verify_rxcert_out,
 145                              sizeof(verify_rxcert_out));
 146        if (byte < 0) {
 147                dev_dbg(dev, "mei_cldev_recv failed: %zd\n", byte);
 148                return byte;
 149        }
 150
 151        if (verify_rxcert_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 152                dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
 153                        WIRED_VERIFY_RECEIVER_CERT,
 154                        verify_rxcert_out.header.status);
 155                return -EIO;
 156        }
 157
 158        *km_stored = !!verify_rxcert_out.km_stored;
 159        if (verify_rxcert_out.km_stored) {
 160                ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM;
 161                *msg_sz = sizeof(struct hdcp2_ake_stored_km);
 162        } else {
 163                ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM;
 164                *msg_sz = sizeof(struct hdcp2_ake_no_stored_km);
 165        }
 166
 167        memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff,
 168               sizeof(verify_rxcert_out.ekm_buff));
 169
 170        return 0;
 171}
 172
 173/**
 174 * mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
 175 * @dev: device corresponding to the mei_cl_device
 176 * @data: Intel HW specific hdcp data
 177 * @rx_hprime: AKE_Send_H_prime msg for ME FW verification
 178 *
 179 * Return: 0 on Success, <0 on Failure
 180 */
 181static int
 182mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
 183                       struct hdcp2_ake_send_hprime *rx_hprime)
 184{
 185        struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
 186        struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
 187        struct mei_cl_device *cldev;
 188        ssize_t byte;
 189
 190        if (!dev || !data || !rx_hprime)
 191                return -EINVAL;
 192
 193        cldev = to_mei_cl_device(dev);
 194
 195        send_hprime_in.header.api_version = HDCP_API_VERSION;
 196        send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
 197        send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
 198        send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
 199
 200        send_hprime_in.port.integrated_port_type = data->port_type;
 201        send_hprime_in.port.physical_port = (u8)data->fw_ddi;
 202        send_hprime_in.port.attached_transcoder = (u8)data->fw_tc;
 203
 204        memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
 205               HDCP_2_2_H_PRIME_LEN);
 206
 207        byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
 208                              sizeof(send_hprime_in));
 209        if (byte < 0) {
 210                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 211                return byte;
 212        }
 213
 214        byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
 215                              sizeof(send_hprime_out));
 216        if (byte < 0) {
 217                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 218                return byte;
 219        }
 220
 221        if (send_hprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 222                dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
 223                        WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status);
 224                return -EIO;
 225        }
 226
 227        return 0;
 228}
 229
 230/**
 231 * mei_hdcp_store_pairing_info() - Store pairing info received at ME FW
 232 * @dev: device corresponding to the mei_cl_device
 233 * @data: Intel HW specific hdcp data
 234 * @pairing_info: AKE_Send_Pairing_Info msg input to ME FW
 235 *
 236 * Return: 0 on Success, <0 on Failure
 237 */
 238static int
 239mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
 240                            struct hdcp2_ake_send_pairing_info *pairing_info)
 241{
 242        struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
 243        struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
 244        struct mei_cl_device *cldev;
 245        ssize_t byte;
 246
 247        if (!dev || !data || !pairing_info)
 248                return -EINVAL;
 249
 250        cldev = to_mei_cl_device(dev);
 251
 252        pairing_info_in.header.api_version = HDCP_API_VERSION;
 253        pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
 254        pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS;
 255        pairing_info_in.header.buffer_len =
 256                                        WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;
 257
 258        pairing_info_in.port.integrated_port_type = data->port_type;
 259        pairing_info_in.port.physical_port = (u8)data->fw_ddi;
 260        pairing_info_in.port.attached_transcoder = (u8)data->fw_tc;
 261
 262        memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
 263               HDCP_2_2_E_KH_KM_LEN);
 264
 265        byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
 266                              sizeof(pairing_info_in));
 267        if (byte < 0) {
 268                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 269                return byte;
 270        }
 271
 272        byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
 273                              sizeof(pairing_info_out));
 274        if (byte < 0) {
 275                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 276                return byte;
 277        }
 278
 279        if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 280                dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
 281                        WIRED_AKE_SEND_PAIRING_INFO,
 282                        pairing_info_out.header.status);
 283                return -EIO;
 284        }
 285
 286        return 0;
 287}
 288
 289/**
 290 * mei_hdcp_initiate_locality_check() - Prepare LC_Init
 291 * @dev: device corresponding to the mei_cl_device
 292 * @data: Intel HW specific hdcp data
 293 * @lc_init_data: LC_Init msg output
 294 *
 295 * Return: 0 on Success, <0 on Failure
 296 */
 297static int
 298mei_hdcp_initiate_locality_check(struct device *dev,
 299                                 struct hdcp_port_data *data,
 300                                 struct hdcp2_lc_init *lc_init_data)
 301{
 302        struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
 303        struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
 304        struct mei_cl_device *cldev;
 305        ssize_t byte;
 306
 307        if (!dev || !data || !lc_init_data)
 308                return -EINVAL;
 309
 310        cldev = to_mei_cl_device(dev);
 311
 312        lc_init_in.header.api_version = HDCP_API_VERSION;
 313        lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
 314        lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
 315        lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;
 316
 317        lc_init_in.port.integrated_port_type = data->port_type;
 318        lc_init_in.port.physical_port = (u8)data->fw_ddi;
 319        lc_init_in.port.attached_transcoder = (u8)data->fw_tc;
 320
 321        byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
 322        if (byte < 0) {
 323                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 324                return byte;
 325        }
 326
 327        byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));
 328        if (byte < 0) {
 329                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 330                return byte;
 331        }
 332
 333        if (lc_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 334                dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
 335                        WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
 336                return -EIO;
 337        }
 338
 339        lc_init_data->msg_id = HDCP_2_2_LC_INIT;
 340        memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);
 341
 342        return 0;
 343}
 344
 345/**
 346 * mei_hdcp_verify_lprime() - Verify lprime.
 347 * @dev: device corresponding to the mei_cl_device
 348 * @data: Intel HW specific hdcp data
 349 * @rx_lprime: LC_Send_L_prime msg for ME FW verification
 350 *
 351 * Return: 0 on Success, <0 on Failure
 352 */
 353static int
 354mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
 355                       struct hdcp2_lc_send_lprime *rx_lprime)
 356{
 357        struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } };
 358        struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } };
 359        struct mei_cl_device *cldev;
 360        ssize_t byte;
 361
 362        if (!dev || !data || !rx_lprime)
 363                return -EINVAL;
 364
 365        cldev = to_mei_cl_device(dev);
 366
 367        verify_lprime_in.header.api_version = HDCP_API_VERSION;
 368        verify_lprime_in.header.command_id = WIRED_VALIDATE_LOCALITY;
 369        verify_lprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
 370        verify_lprime_in.header.buffer_len =
 371                                        WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN;
 372
 373        verify_lprime_in.port.integrated_port_type = data->port_type;
 374        verify_lprime_in.port.physical_port = (u8)data->fw_ddi;
 375        verify_lprime_in.port.attached_transcoder = (u8)data->fw_tc;
 376
 377        memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime,
 378               HDCP_2_2_L_PRIME_LEN);
 379
 380        byte = mei_cldev_send(cldev, (u8 *)&verify_lprime_in,
 381                              sizeof(verify_lprime_in));
 382        if (byte < 0) {
 383                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 384                return byte;
 385        }
 386
 387        byte = mei_cldev_recv(cldev, (u8 *)&verify_lprime_out,
 388                              sizeof(verify_lprime_out));
 389        if (byte < 0) {
 390                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 391                return byte;
 392        }
 393
 394        if (verify_lprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 395                dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 396                        WIRED_VALIDATE_LOCALITY,
 397                        verify_lprime_out.header.status);
 398                return -EIO;
 399        }
 400
 401        return 0;
 402}
 403
 404/**
 405 * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks.
 406 * @dev: device corresponding to the mei_cl_device
 407 * @data: Intel HW specific hdcp data
 408 * @ske_data: SKE_Send_Eks msg output from ME FW.
 409 *
 410 * Return: 0 on Success, <0 on Failure
 411 */
 412static int mei_hdcp_get_session_key(struct device *dev,
 413                                    struct hdcp_port_data *data,
 414                                    struct hdcp2_ske_send_eks *ske_data)
 415{
 416        struct wired_cmd_get_session_key_in get_skey_in = { { 0 } };
 417        struct wired_cmd_get_session_key_out get_skey_out = { { 0 } };
 418        struct mei_cl_device *cldev;
 419        ssize_t byte;
 420
 421        if (!dev || !data || !ske_data)
 422                return -EINVAL;
 423
 424        cldev = to_mei_cl_device(dev);
 425
 426        get_skey_in.header.api_version = HDCP_API_VERSION;
 427        get_skey_in.header.command_id = WIRED_GET_SESSION_KEY;
 428        get_skey_in.header.status = ME_HDCP_STATUS_SUCCESS;
 429        get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN;
 430
 431        get_skey_in.port.integrated_port_type = data->port_type;
 432        get_skey_in.port.physical_port = (u8)data->fw_ddi;
 433        get_skey_in.port.attached_transcoder = (u8)data->fw_tc;
 434
 435        byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in));
 436        if (byte < 0) {
 437                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 438                return byte;
 439        }
 440
 441        byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out));
 442
 443        if (byte < 0) {
 444                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 445                return byte;
 446        }
 447
 448        if (get_skey_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 449                dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 450                        WIRED_GET_SESSION_KEY, get_skey_out.header.status);
 451                return -EIO;
 452        }
 453
 454        ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS;
 455        memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks,
 456               HDCP_2_2_E_DKEY_KS_LEN);
 457        memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN);
 458
 459        return 0;
 460}
 461
 462/**
 463 * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream topology
 464 * and prepare rep_ack.
 465 * @dev: device corresponding to the mei_cl_device
 466 * @data: Intel HW specific hdcp data
 467 * @rep_topology: Receiver ID List to be validated
 468 * @rep_send_ack : repeater ack from ME FW.
 469 *
 470 * Return: 0 on Success, <0 on Failure
 471 */
 472static int
 473mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
 474                                         struct hdcp_port_data *data,
 475                                         struct hdcp2_rep_send_receiverid_list
 476                                                        *rep_topology,
 477                                         struct hdcp2_rep_send_ack
 478                                                        *rep_send_ack)
 479{
 480        struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
 481        struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
 482        struct mei_cl_device *cldev;
 483        ssize_t byte;
 484
 485        if (!dev || !rep_topology || !rep_send_ack || !data)
 486                return -EINVAL;
 487
 488        cldev = to_mei_cl_device(dev);
 489
 490        verify_repeater_in.header.api_version = HDCP_API_VERSION;
 491        verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
 492        verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS;
 493        verify_repeater_in.header.buffer_len =
 494                                        WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
 495
 496        verify_repeater_in.port.integrated_port_type = data->port_type;
 497        verify_repeater_in.port.physical_port = (u8)data->fw_ddi;
 498        verify_repeater_in.port.attached_transcoder = (u8)data->fw_tc;
 499
 500        memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
 501               HDCP_2_2_RXINFO_LEN);
 502        memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
 503               HDCP_2_2_SEQ_NUM_LEN);
 504        memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
 505               HDCP_2_2_V_PRIME_HALF_LEN);
 506        memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
 507               HDCP_2_2_RECEIVER_IDS_MAX_LEN);
 508
 509        byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
 510                              sizeof(verify_repeater_in));
 511        if (byte < 0) {
 512                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 513                return byte;
 514        }
 515
 516        byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
 517                              sizeof(verify_repeater_out));
 518        if (byte < 0) {
 519                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 520                return byte;
 521        }
 522
 523        if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 524                dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 525                        WIRED_VERIFY_REPEATER,
 526                        verify_repeater_out.header.status);
 527                return -EIO;
 528        }
 529
 530        memcpy(rep_send_ack->v, verify_repeater_out.v,
 531               HDCP_2_2_V_PRIME_HALF_LEN);
 532        rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
 533
 534        return 0;
 535}
 536
 537/**
 538 * mei_hdcp_verify_mprime() - Verify mprime.
 539 * @dev: device corresponding to the mei_cl_device
 540 * @data: Intel HW specific hdcp data
 541 * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
 542 *
 543 * Return: 0 on Success, <0 on Failure
 544 */
 545static int mei_hdcp_verify_mprime(struct device *dev,
 546                                  struct hdcp_port_data *data,
 547                                  struct hdcp2_rep_stream_ready *stream_ready)
 548{
 549        struct wired_cmd_repeater_auth_stream_req_in *verify_mprime_in;
 550        struct wired_cmd_repeater_auth_stream_req_out
 551                                        verify_mprime_out = { { 0 } };
 552        struct mei_cl_device *cldev;
 553        ssize_t byte;
 554        size_t cmd_size;
 555
 556        if (!dev || !stream_ready || !data)
 557                return -EINVAL;
 558
 559        cldev = to_mei_cl_device(dev);
 560
 561        cmd_size = struct_size(verify_mprime_in, streams, data->k);
 562        if (cmd_size == SIZE_MAX)
 563                return -EINVAL;
 564
 565        verify_mprime_in = kzalloc(cmd_size, GFP_KERNEL);
 566        if (!verify_mprime_in)
 567                return -ENOMEM;
 568
 569        verify_mprime_in->header.api_version = HDCP_API_VERSION;
 570        verify_mprime_in->header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ;
 571        verify_mprime_in->header.status = ME_HDCP_STATUS_SUCCESS;
 572        verify_mprime_in->header.buffer_len = cmd_size  - sizeof(verify_mprime_in->header);
 573
 574        verify_mprime_in->port.integrated_port_type = data->port_type;
 575        verify_mprime_in->port.physical_port = (u8)data->fw_ddi;
 576        verify_mprime_in->port.attached_transcoder = (u8)data->fw_tc;
 577
 578        memcpy(verify_mprime_in->m_prime, stream_ready->m_prime, HDCP_2_2_MPRIME_LEN);
 579        drm_hdcp_cpu_to_be24(verify_mprime_in->seq_num_m, data->seq_num_m);
 580
 581        memcpy(verify_mprime_in->streams, data->streams,
 582               array_size(data->k, sizeof(*data->streams)));
 583
 584        verify_mprime_in->k = cpu_to_be16(data->k);
 585
 586        byte = mei_cldev_send(cldev, (u8 *)verify_mprime_in, cmd_size);
 587        kfree(verify_mprime_in);
 588        if (byte < 0) {
 589                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 590                return byte;
 591        }
 592
 593        byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out,
 594                              sizeof(verify_mprime_out));
 595        if (byte < 0) {
 596                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 597                return byte;
 598        }
 599
 600        if (verify_mprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 601                dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 602                        WIRED_REPEATER_AUTH_STREAM_REQ,
 603                        verify_mprime_out.header.status);
 604                return -EIO;
 605        }
 606
 607        return 0;
 608}
 609
 610/**
 611 * mei_hdcp_enable_authentication() - Mark a port as authenticated
 612 * through ME FW
 613 * @dev: device corresponding to the mei_cl_device
 614 * @data: Intel HW specific hdcp data
 615 *
 616 * Return: 0 on Success, <0 on Failure
 617 */
 618static int mei_hdcp_enable_authentication(struct device *dev,
 619                                          struct hdcp_port_data *data)
 620{
 621        struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
 622        struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
 623        struct mei_cl_device *cldev;
 624        ssize_t byte;
 625
 626        if (!dev || !data)
 627                return -EINVAL;
 628
 629        cldev = to_mei_cl_device(dev);
 630
 631        enable_auth_in.header.api_version = HDCP_API_VERSION;
 632        enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
 633        enable_auth_in.header.status = ME_HDCP_STATUS_SUCCESS;
 634        enable_auth_in.header.buffer_len = WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
 635
 636        enable_auth_in.port.integrated_port_type = data->port_type;
 637        enable_auth_in.port.physical_port = (u8)data->fw_ddi;
 638        enable_auth_in.port.attached_transcoder = (u8)data->fw_tc;
 639        enable_auth_in.stream_type = data->streams[0].stream_type;
 640
 641        byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
 642                              sizeof(enable_auth_in));
 643        if (byte < 0) {
 644                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 645                return byte;
 646        }
 647
 648        byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
 649                              sizeof(enable_auth_out));
 650        if (byte < 0) {
 651                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 652                return byte;
 653        }
 654
 655        if (enable_auth_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 656                dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 657                        WIRED_ENABLE_AUTH, enable_auth_out.header.status);
 658                return -EIO;
 659        }
 660
 661        return 0;
 662}
 663
 664/**
 665 * mei_hdcp_close_session() - Close the Wired HDCP Tx session of ME FW per port.
 666 * This also disables the authenticated state of the port.
 667 * @dev: device corresponding to the mei_cl_device
 668 * @data: Intel HW specific hdcp data
 669 *
 670 * Return: 0 on Success, <0 on Failure
 671 */
 672static int
 673mei_hdcp_close_session(struct device *dev, struct hdcp_port_data *data)
 674{
 675        struct wired_cmd_close_session_in session_close_in = { { 0 } };
 676        struct wired_cmd_close_session_out session_close_out = { { 0 } };
 677        struct mei_cl_device *cldev;
 678        ssize_t byte;
 679
 680        if (!dev || !data)
 681                return -EINVAL;
 682
 683        cldev = to_mei_cl_device(dev);
 684
 685        session_close_in.header.api_version = HDCP_API_VERSION;
 686        session_close_in.header.command_id = WIRED_CLOSE_SESSION;
 687        session_close_in.header.status = ME_HDCP_STATUS_SUCCESS;
 688        session_close_in.header.buffer_len =
 689                                WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN;
 690
 691        session_close_in.port.integrated_port_type = data->port_type;
 692        session_close_in.port.physical_port = (u8)data->fw_ddi;
 693        session_close_in.port.attached_transcoder = (u8)data->fw_tc;
 694
 695        byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
 696                              sizeof(session_close_in));
 697        if (byte < 0) {
 698                dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 699                return byte;
 700        }
 701
 702        byte = mei_cldev_recv(cldev, (u8 *)&session_close_out,
 703                              sizeof(session_close_out));
 704        if (byte < 0) {
 705                dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 706                return byte;
 707        }
 708
 709        if (session_close_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 710                dev_dbg(dev, "Session Close Failed. status: 0x%X\n",
 711                        session_close_out.header.status);
 712                return -EIO;
 713        }
 714
 715        return 0;
 716}
 717
 718static const struct i915_hdcp_component_ops mei_hdcp_ops = {
 719        .owner = THIS_MODULE,
 720        .initiate_hdcp2_session = mei_hdcp_initiate_session,
 721        .verify_receiver_cert_prepare_km =
 722                                mei_hdcp_verify_receiver_cert_prepare_km,
 723        .verify_hprime = mei_hdcp_verify_hprime,
 724        .store_pairing_info = mei_hdcp_store_pairing_info,
 725        .initiate_locality_check = mei_hdcp_initiate_locality_check,
 726        .verify_lprime = mei_hdcp_verify_lprime,
 727        .get_session_key = mei_hdcp_get_session_key,
 728        .repeater_check_flow_prepare_ack =
 729                                mei_hdcp_repeater_check_flow_prepare_ack,
 730        .verify_mprime = mei_hdcp_verify_mprime,
 731        .enable_hdcp_authentication = mei_hdcp_enable_authentication,
 732        .close_hdcp_session = mei_hdcp_close_session,
 733};
 734
 735static int mei_component_master_bind(struct device *dev)
 736{
 737        struct mei_cl_device *cldev = to_mei_cl_device(dev);
 738        struct i915_hdcp_comp_master *comp_master =
 739                                                mei_cldev_get_drvdata(cldev);
 740        int ret;
 741
 742        dev_dbg(dev, "%s\n", __func__);
 743        comp_master->ops = &mei_hdcp_ops;
 744        comp_master->mei_dev = dev;
 745        ret = component_bind_all(dev, comp_master);
 746        if (ret < 0)
 747                return ret;
 748
 749        return 0;
 750}
 751
 752static void mei_component_master_unbind(struct device *dev)
 753{
 754        struct mei_cl_device *cldev = to_mei_cl_device(dev);
 755        struct i915_hdcp_comp_master *comp_master =
 756                                                mei_cldev_get_drvdata(cldev);
 757
 758        dev_dbg(dev, "%s\n", __func__);
 759        component_unbind_all(dev, comp_master);
 760}
 761
 762static const struct component_master_ops mei_component_master_ops = {
 763        .bind = mei_component_master_bind,
 764        .unbind = mei_component_master_unbind,
 765};
 766
 767/**
 768 * mei_hdcp_component_match - compare function for matching mei hdcp.
 769 *
 770 *    The function checks if the driver is i915, the subcomponent is HDCP
 771 *    and the grand parent of hdcp and the parent of i915 are the same
 772 *    PCH device.
 773 *
 774 * @dev: master device
 775 * @subcomponent: subcomponent to match (I915_COMPONENT_HDCP)
 776 * @data: compare data (mei hdcp device)
 777 *
 778 * Return:
 779 * * 1 - if components match
 780 * * 0 - otherwise
 781 */
 782static int mei_hdcp_component_match(struct device *dev, int subcomponent,
 783                                    void *data)
 784{
 785        struct device *base = data;
 786
 787        if (strcmp(dev->driver->name, "i915") ||
 788            subcomponent != I915_COMPONENT_HDCP)
 789                return 0;
 790
 791        base = base->parent;
 792        if (!base)
 793                return 0;
 794
 795        base = base->parent;
 796        dev = dev->parent;
 797
 798        return (base && dev && dev == base);
 799}
 800
 801static int mei_hdcp_probe(struct mei_cl_device *cldev,
 802                          const struct mei_cl_device_id *id)
 803{
 804        struct i915_hdcp_comp_master *comp_master;
 805        struct component_match *master_match;
 806        int ret;
 807
 808        ret = mei_cldev_enable(cldev);
 809        if (ret < 0) {
 810                dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
 811                goto enable_err_exit;
 812        }
 813
 814        comp_master = kzalloc(sizeof(*comp_master), GFP_KERNEL);
 815        if (!comp_master) {
 816                ret = -ENOMEM;
 817                goto err_exit;
 818        }
 819
 820        master_match = NULL;
 821        component_match_add_typed(&cldev->dev, &master_match,
 822                                  mei_hdcp_component_match, &cldev->dev);
 823        if (IS_ERR_OR_NULL(master_match)) {
 824                ret = -ENOMEM;
 825                goto err_exit;
 826        }
 827
 828        mei_cldev_set_drvdata(cldev, comp_master);
 829        ret = component_master_add_with_match(&cldev->dev,
 830                                              &mei_component_master_ops,
 831                                              master_match);
 832        if (ret < 0) {
 833                dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
 834                goto err_exit;
 835        }
 836
 837        return 0;
 838
 839err_exit:
 840        mei_cldev_set_drvdata(cldev, NULL);
 841        kfree(comp_master);
 842        mei_cldev_disable(cldev);
 843enable_err_exit:
 844        return ret;
 845}
 846
 847static void mei_hdcp_remove(struct mei_cl_device *cldev)
 848{
 849        struct i915_hdcp_comp_master *comp_master =
 850                                                mei_cldev_get_drvdata(cldev);
 851        int ret;
 852
 853        component_master_del(&cldev->dev, &mei_component_master_ops);
 854        kfree(comp_master);
 855        mei_cldev_set_drvdata(cldev, NULL);
 856
 857        ret = mei_cldev_disable(cldev);
 858        if (ret)
 859                dev_warn(&cldev->dev, "mei_cldev_disable() failed\n");
 860}
 861
 862#define MEI_UUID_HDCP GUID_INIT(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \
 863                                0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
 864
 865static const struct mei_cl_device_id mei_hdcp_tbl[] = {
 866        { .uuid = MEI_UUID_HDCP, .version = MEI_CL_VERSION_ANY },
 867        { }
 868};
 869MODULE_DEVICE_TABLE(mei, mei_hdcp_tbl);
 870
 871static struct mei_cl_driver mei_hdcp_driver = {
 872        .id_table = mei_hdcp_tbl,
 873        .name = KBUILD_MODNAME,
 874        .probe = mei_hdcp_probe,
 875        .remove = mei_hdcp_remove,
 876};
 877
 878module_mei_cl_driver(mei_hdcp_driver);
 879
 880MODULE_AUTHOR("Intel Corporation");
 881MODULE_LICENSE("GPL");
 882MODULE_DESCRIPTION("MEI HDCP");
 883