drivers/misc/mei/hdcp/mei_hdcp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright © 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/mei.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_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  */
  38 static int
  39 mei_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 = FW_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->hdcp_ddi;
  61         session_init_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
  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 != FW_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  */
 104 static int
 105 mei_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 = FW_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->hdcp_ddi;
 131         verify_rxcert_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 181 static int
 182 mei_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 = FW_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->hdcp_ddi;
 202         send_hprime_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 238 static int
 239 mei_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 = FW_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->hdcp_ddi;
 260         pairing_info_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 297 static int
 298 mei_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 = FW_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->hdcp_ddi;
 319         lc_init_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 353 static int
 354 mei_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 = FW_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->hdcp_ddi;
 375         verify_lprime_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 412 static 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 = FW_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->hdcp_ddi;
 433         get_skey_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 472 static int
 473 mei_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 = FW_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->hdcp_ddi;
 498         verify_repeater_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 545 static 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 = FW_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->hdcp_ddi;
 576         verify_mprime_in->port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 618 static 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 = FW_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->hdcp_ddi;
 638         enable_auth_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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  */
 672 static int
 673 mei_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 = FW_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->hdcp_ddi;
 693         session_close_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 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 != FW_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
 718 static const struct i915_hdcp_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
 735 static int mei_component_master_bind(struct device *dev)
 736 {
 737         struct mei_cl_device *cldev = to_mei_cl_device(dev);
 738         struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
 739         int ret;
 740
 741         dev_dbg(dev, "%s\n", __func__);
 742         comp_arbiter->ops = &mei_hdcp_ops;
 743         comp_arbiter->hdcp_dev = dev;
 744         ret = component_bind_all(dev, comp_arbiter);
 745         if (ret < 0)
 746                 return ret;
 747
 748         return 0;
 749 }
 750
 751 static void mei_component_master_unbind(struct device *dev)
 752 {
 753         struct mei_cl_device *cldev = to_mei_cl_device(dev);
 754         struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
 755
 756         dev_dbg(dev, "%s\n", __func__);
 757         component_unbind_all(dev, comp_arbiter);
 758 }
 759
 760 static const struct component_master_ops mei_component_master_ops = {
 761         .bind = mei_component_master_bind,
 762         .unbind = mei_component_master_unbind,
 763 };
 764
 765 /**
 766  * mei_hdcp_component_match - compare function for matching mei hdcp.
 767  *
 768  *    The function checks if the driver is i915, the subcomponent is HDCP
 769  *    and the grand parent of hdcp and the parent of i915 are the same
 770  *    PCH device.
 771  *
 772  * @dev: master device
 773  * @subcomponent: subcomponent to match (I915_COMPONENT_HDCP)
 774  * @data: compare data (mei hdcp device)
 775  *
 776  * Return:
 777  * * 1 - if components match
 778  * * 0 - otherwise
 779  */
 780 static int mei_hdcp_component_match(struct device *dev, int subcomponent,
 781                                     void *data)
 782 {
 783         struct device *base = data;
 784
 785         if (!dev->driver || strcmp(dev->driver->name, "i915") ||
 786             subcomponent != I915_COMPONENT_HDCP)
 787                 return 0;
 788
 789         base = base->parent;
 790         if (!base)
 791                 return 0;
 792
 793         base = base->parent;
 794         dev = dev->parent;
 795
 796         return (base && dev && dev == base);
 797 }
 798
 799 static int mei_hdcp_probe(struct mei_cl_device *cldev,
 800                           const struct mei_cl_device_id *id)
 801 {
 802         struct i915_hdcp_arbiter *comp_arbiter;
 803         struct component_match *master_match;
 804         int ret;
 805
 806         ret = mei_cldev_enable(cldev);
 807         if (ret < 0) {
 808                 dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
 809                 goto enable_err_exit;
 810         }
 811
 812         comp_arbiter = kzalloc(sizeof(*comp_arbiter), GFP_KERNEL);
 813         if (!comp_arbiter) {
 814                 ret = -ENOMEM;
 815                 goto err_exit;
 816         }
 817
 818         master_match = NULL;
 819         component_match_add_typed(&cldev->dev, &master_match,
 820                                   mei_hdcp_component_match, &cldev->dev);
 821         if (IS_ERR_OR_NULL(master_match)) {
 822                 ret = -ENOMEM;
 823                 goto err_exit;
 824         }
 825
 826         mei_cldev_set_drvdata(cldev, comp_arbiter);
 827         ret = component_master_add_with_match(&cldev->dev,
 828                                               &mei_component_master_ops,
 829                                               master_match);
 830         if (ret < 0) {
 831                 dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
 832                 goto err_exit;
 833         }
 834
 835         return 0;
 836
 837 err_exit:
 838         mei_cldev_set_drvdata(cldev, NULL);
 839         kfree(comp_arbiter);
 840         mei_cldev_disable(cldev);
 841 enable_err_exit:
 842         return ret;
 843 }
 844
 845 static void mei_hdcp_remove(struct mei_cl_device *cldev)
 846 {
 847         struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
 848         int ret;
 849
 850         component_master_del(&cldev->dev, &mei_component_master_ops);
 851         kfree(comp_arbiter);
 852         mei_cldev_set_drvdata(cldev, NULL);
 853
 854         ret = mei_cldev_disable(cldev);
 855         if (ret)
 856                 dev_warn(&cldev->dev, "mei_cldev_disable() failed\n");
 857 }
 858
 859 #define MEI_UUID_HDCP UUID_LE(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \
 860                               0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
 861
 862 static const struct mei_cl_device_id mei_hdcp_tbl[] = {
 863         { .uuid = MEI_UUID_HDCP, .version = MEI_CL_VERSION_ANY },
 864         { }
 865 };
 866 MODULE_DEVICE_TABLE(mei, mei_hdcp_tbl);
 867
 868 static struct mei_cl_driver mei_hdcp_driver = {
 869         .id_table = mei_hdcp_tbl,
 870         .name = KBUILD_MODNAME,
 871         .probe = mei_hdcp_probe,
 872         .remove = mei_hdcp_remove,
 873 };
 874
 875 module_mei_cl_driver(mei_hdcp_driver);
 876
 877 MODULE_AUTHOR("Intel Corporation");
 878 MODULE_LICENSE("GPL");
 879 MODULE_DESCRIPTION("MEI HDCP");