drivers/misc/mei/hdcp/mei

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
mei_get_ddi_index
mei_hdcp_initiate_session
mei_hdcp_verify_receiver_cert_prepare_km
mei_hdcp_verify_hprime
mei_hdcp_store_pairing_info
mei_hdcp_initiate_locality_check
mei_hdcp_verify_lprime
mei_hdcp_get_session_key
mei_hdcp_repeater_check_flow_prepare_ack
mei_hdcp_verify_mprime
mei_hdcp_enable_authentication
mei_hdcp_close_session
mei_component_master_bind
mei_component_master_unbind
mei_hdcp_component_match
mei_hdcp_probe
mei_hdcp_remove
   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/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 static inline u8 mei_get_ddi_index(enum port port)
  31 {
  32         switch (port) {
  33         case PORT_A:
  34                 return MEI_DDI_A;
  35         case PORT_B ... PORT_F:
  36                 return (u8)port;
  37         default:
  38                 return MEI_DDI_INVALID_PORT;
  39         }
  40 }
  41 
  42 /**
  43  * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW
  44  * @dev: device corresponding to the mei_cl_device
  45  * @data: Intel HW specific hdcp data
  46  * @ake_data: AKE_Init msg output.
  47  *
  48  * Return:  0 on Success, <0 on Failure.
  49  */
  50 static int
  51 mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
  52                           struct hdcp2_ake_init *ake_data)
  53 {
  54         struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
  55         struct wired_cmd_initiate_hdcp2_session_out
  56                                                 session_init_out = { { 0 } };
  57         struct mei_cl_device *cldev;
  58         ssize_t byte;
  59 
  60         if (!dev || !data || !ake_data)
  61                 return -EINVAL;
  62 
  63         cldev = to_mei_cl_device(dev);
  64 
  65         session_init_in.header.api_version = HDCP_API_VERSION;
  66         session_init_in.header.command_id = WIRED_INITIATE_HDCP2_SESSION;
  67         session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
  68         session_init_in.header.buffer_len =
  69                                 WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
  70 
  71         session_init_in.port.integrated_port_type = data->port_type;
  72         session_init_in.port.physical_port = mei_get_ddi_index(data->port);
  73         session_init_in.protocol = data->protocol;
  74 
  75         byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
  76                               sizeof(session_init_in));
  77         if (byte < 0) {
  78                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
  79                 return byte;
  80         }
  81 
  82         byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
  83                               sizeof(session_init_out));
  84         if (byte < 0) {
  85                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
  86                 return byte;
  87         }
  88 
  89         if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
  90                 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
  91                         WIRED_INITIATE_HDCP2_SESSION,
  92                         session_init_out.header.status);
  93                 return -EIO;
  94         }
  95 
  96         ake_data->msg_id = HDCP_2_2_AKE_INIT;
  97         ake_data->tx_caps = session_init_out.tx_caps;
  98         memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);
  99 
 100         return 0;
 101 }
 102 
 103 /**
 104  * mei_hdcp_verify_receiver_cert_prepare_km() - Verify the Receiver Certificate
 105  * AKE_Send_Cert and prepare AKE_Stored_Km/AKE_No_Stored_Km
 106  * @dev: device corresponding to the mei_cl_device
 107  * @data: Intel HW specific hdcp data
 108  * @rx_cert: AKE_Send_Cert for verification
 109  * @km_stored: Pairing status flag output
 110  * @ek_pub_km: AKE_Stored_Km/AKE_No_Stored_Km output msg
 111  * @msg_sz : size of AKE_XXXXX_Km output msg
 112  *
 113  * Return: 0 on Success, <0 on Failure
 114  */
 115 static int
 116 mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev,
 117                                          struct hdcp_port_data *data,
 118                                          struct hdcp2_ake_send_cert *rx_cert,
 119                                          bool *km_stored,
 120                                          struct hdcp2_ake_no_stored_km
 121                                                                 *ek_pub_km,
 122                                          size_t *msg_sz)
 123 {
 124         struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } };
 125         struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } };
 126         struct mei_cl_device *cldev;
 127         ssize_t byte;
 128 
 129         if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
 130                 return -EINVAL;
 131 
 132         cldev = to_mei_cl_device(dev);
 133 
 134         verify_rxcert_in.header.api_version = HDCP_API_VERSION;
 135         verify_rxcert_in.header.command_id = WIRED_VERIFY_RECEIVER_CERT;
 136         verify_rxcert_in.header.status = ME_HDCP_STATUS_SUCCESS;
 137         verify_rxcert_in.header.buffer_len =
 138                                 WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN;
 139 
 140         verify_rxcert_in.port.integrated_port_type = data->port_type;
 141         verify_rxcert_in.port.physical_port = mei_get_ddi_index(data->port);
 142 
 143         verify_rxcert_in.cert_rx = rx_cert->cert_rx;
 144         memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN);
 145         memcpy(verify_rxcert_in.rx_caps, rx_cert->rx_caps, HDCP_2_2_RXCAPS_LEN);
 146 
 147         byte = mei_cldev_send(cldev, (u8 *)&verify_rxcert_in,
 148                               sizeof(verify_rxcert_in));
 149         if (byte < 0) {
 150                 dev_dbg(dev, "mei_cldev_send failed: %zd\n", byte);
 151                 return byte;
 152         }
 153 
 154         byte = mei_cldev_recv(cldev, (u8 *)&verify_rxcert_out,
 155                               sizeof(verify_rxcert_out));
 156         if (byte < 0) {
 157                 dev_dbg(dev, "mei_cldev_recv failed: %zd\n", byte);
 158                 return byte;
 159         }
 160 
 161         if (verify_rxcert_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 162                 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
 163                         WIRED_VERIFY_RECEIVER_CERT,
 164                         verify_rxcert_out.header.status);
 165                 return -EIO;
 166         }
 167 
 168         *km_stored = !!verify_rxcert_out.km_stored;
 169         if (verify_rxcert_out.km_stored) {
 170                 ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM;
 171                 *msg_sz = sizeof(struct hdcp2_ake_stored_km);
 172         } else {
 173                 ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM;
 174                 *msg_sz = sizeof(struct hdcp2_ake_no_stored_km);
 175         }
 176 
 177         memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff,
 178                sizeof(verify_rxcert_out.ekm_buff));
 179 
 180         return 0;
 181 }
 182 
 183 /**
 184  * mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
 185  * @dev: device corresponding to the mei_cl_device
 186  * @data: Intel HW specific hdcp data
 187  * @rx_hprime: AKE_Send_H_prime msg for ME FW verification
 188  *
 189  * Return: 0 on Success, <0 on Failure
 190  */
 191 static int
 192 mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
 193                        struct hdcp2_ake_send_hprime *rx_hprime)
 194 {
 195         struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
 196         struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
 197         struct mei_cl_device *cldev;
 198         ssize_t byte;
 199 
 200         if (!dev || !data || !rx_hprime)
 201                 return -EINVAL;
 202 
 203         cldev = to_mei_cl_device(dev);
 204 
 205         send_hprime_in.header.api_version = HDCP_API_VERSION;
 206         send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
 207         send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
 208         send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
 209 
 210         send_hprime_in.port.integrated_port_type = data->port_type;
 211         send_hprime_in.port.physical_port = mei_get_ddi_index(data->port);
 212 
 213         memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
 214                HDCP_2_2_H_PRIME_LEN);
 215 
 216         byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
 217                               sizeof(send_hprime_in));
 218         if (byte < 0) {
 219                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 220                 return byte;
 221         }
 222 
 223         byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
 224                               sizeof(send_hprime_out));
 225         if (byte < 0) {
 226                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 227                 return byte;
 228         }
 229 
 230         if (send_hprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 231                 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
 232                         WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status);
 233                 return -EIO;
 234         }
 235 
 236         return 0;
 237 }
 238 
 239 /**
 240  * mei_hdcp_store_pairing_info() - Store pairing info received at ME FW
 241  * @dev: device corresponding to the mei_cl_device
 242  * @data: Intel HW specific hdcp data
 243  * @pairing_info: AKE_Send_Pairing_Info msg input to ME FW
 244  *
 245  * Return: 0 on Success, <0 on Failure
 246  */
 247 static int
 248 mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
 249                             struct hdcp2_ake_send_pairing_info *pairing_info)
 250 {
 251         struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
 252         struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
 253         struct mei_cl_device *cldev;
 254         ssize_t byte;
 255 
 256         if (!dev || !data || !pairing_info)
 257                 return -EINVAL;
 258 
 259         cldev = to_mei_cl_device(dev);
 260 
 261         pairing_info_in.header.api_version = HDCP_API_VERSION;
 262         pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
 263         pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS;
 264         pairing_info_in.header.buffer_len =
 265                                         WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;
 266 
 267         pairing_info_in.port.integrated_port_type = data->port_type;
 268         pairing_info_in.port.physical_port = mei_get_ddi_index(data->port);
 269 
 270         memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
 271                HDCP_2_2_E_KH_KM_LEN);
 272 
 273         byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
 274                               sizeof(pairing_info_in));
 275         if (byte < 0) {
 276                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 277                 return byte;
 278         }
 279 
 280         byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
 281                               sizeof(pairing_info_out));
 282         if (byte < 0) {
 283                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 284                 return byte;
 285         }
 286 
 287         if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 288                 dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
 289                         WIRED_AKE_SEND_PAIRING_INFO,
 290                         pairing_info_out.header.status);
 291                 return -EIO;
 292         }
 293 
 294         return 0;
 295 }
 296 
 297 /**
 298  * mei_hdcp_initiate_locality_check() - Prepare LC_Init
 299  * @dev: device corresponding to the mei_cl_device
 300  * @data: Intel HW specific hdcp data
 301  * @lc_init_data: LC_Init msg output
 302  *
 303  * Return: 0 on Success, <0 on Failure
 304  */
 305 static int
 306 mei_hdcp_initiate_locality_check(struct device *dev,
 307                                  struct hdcp_port_data *data,
 308                                  struct hdcp2_lc_init *lc_init_data)
 309 {
 310         struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
 311         struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
 312         struct mei_cl_device *cldev;
 313         ssize_t byte;
 314 
 315         if (!dev || !data || !lc_init_data)
 316                 return -EINVAL;
 317 
 318         cldev = to_mei_cl_device(dev);
 319 
 320         lc_init_in.header.api_version = HDCP_API_VERSION;
 321         lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
 322         lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
 323         lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;
 324 
 325         lc_init_in.port.integrated_port_type = data->port_type;
 326         lc_init_in.port.physical_port = mei_get_ddi_index(data->port);
 327 
 328         byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
 329         if (byte < 0) {
 330                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 331                 return byte;
 332         }
 333 
 334         byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));
 335         if (byte < 0) {
 336                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 337                 return byte;
 338         }
 339 
 340         if (lc_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 341                 dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
 342                         WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
 343                 return -EIO;
 344         }
 345 
 346         lc_init_data->msg_id = HDCP_2_2_LC_INIT;
 347         memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);
 348 
 349         return 0;
 350 }
 351 
 352 /**
 353  * mei_hdcp_verify_lprime() - Verify lprime.
 354  * @dev: device corresponding to the mei_cl_device
 355  * @data: Intel HW specific hdcp data
 356  * @rx_lprime: LC_Send_L_prime msg for ME FW verification
 357  *
 358  * Return: 0 on Success, <0 on Failure
 359  */
 360 static int
 361 mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
 362                        struct hdcp2_lc_send_lprime *rx_lprime)
 363 {
 364         struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } };
 365         struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } };
 366         struct mei_cl_device *cldev;
 367         ssize_t byte;
 368 
 369         if (!dev || !data || !rx_lprime)
 370                 return -EINVAL;
 371 
 372         cldev = to_mei_cl_device(dev);
 373 
 374         verify_lprime_in.header.api_version = HDCP_API_VERSION;
 375         verify_lprime_in.header.command_id = WIRED_VALIDATE_LOCALITY;
 376         verify_lprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
 377         verify_lprime_in.header.buffer_len =
 378                                         WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN;
 379 
 380         verify_lprime_in.port.integrated_port_type = data->port_type;
 381         verify_lprime_in.port.physical_port = mei_get_ddi_index(data->port);
 382 
 383         memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime,
 384                HDCP_2_2_L_PRIME_LEN);
 385 
 386         byte = mei_cldev_send(cldev, (u8 *)&verify_lprime_in,
 387                               sizeof(verify_lprime_in));
 388         if (byte < 0) {
 389                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 390                 return byte;
 391         }
 392 
 393         byte = mei_cldev_recv(cldev, (u8 *)&verify_lprime_out,
 394                               sizeof(verify_lprime_out));
 395         if (byte < 0) {
 396                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 397                 return byte;
 398         }
 399 
 400         if (verify_lprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 401                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 402                         WIRED_VALIDATE_LOCALITY,
 403                         verify_lprime_out.header.status);
 404                 return -EIO;
 405         }
 406 
 407         return 0;
 408 }
 409 
 410 /**
 411  * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks.
 412  * @dev: device corresponding to the mei_cl_device
 413  * @data: Intel HW specific hdcp data
 414  * @ske_data: SKE_Send_Eks msg output from ME FW.
 415  *
 416  * Return: 0 on Success, <0 on Failure
 417  */
 418 static int mei_hdcp_get_session_key(struct device *dev,
 419                                     struct hdcp_port_data *data,
 420                                     struct hdcp2_ske_send_eks *ske_data)
 421 {
 422         struct wired_cmd_get_session_key_in get_skey_in = { { 0 } };
 423         struct wired_cmd_get_session_key_out get_skey_out = { { 0 } };
 424         struct mei_cl_device *cldev;
 425         ssize_t byte;
 426 
 427         if (!dev || !data || !ske_data)
 428                 return -EINVAL;
 429 
 430         cldev = to_mei_cl_device(dev);
 431 
 432         get_skey_in.header.api_version = HDCP_API_VERSION;
 433         get_skey_in.header.command_id = WIRED_GET_SESSION_KEY;
 434         get_skey_in.header.status = ME_HDCP_STATUS_SUCCESS;
 435         get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN;
 436 
 437         get_skey_in.port.integrated_port_type = data->port_type;
 438         get_skey_in.port.physical_port = mei_get_ddi_index(data->port);
 439 
 440         byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in));
 441         if (byte < 0) {
 442                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 443                 return byte;
 444         }
 445 
 446         byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out));
 447 
 448         if (byte < 0) {
 449                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 450                 return byte;
 451         }
 452 
 453         if (get_skey_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 454                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 455                         WIRED_GET_SESSION_KEY, get_skey_out.header.status);
 456                 return -EIO;
 457         }
 458 
 459         ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS;
 460         memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks,
 461                HDCP_2_2_E_DKEY_KS_LEN);
 462         memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN);
 463 
 464         return 0;
 465 }
 466 
 467 /**
 468  * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream topology
 469  * and prepare rep_ack.
 470  * @dev: device corresponding to the mei_cl_device
 471  * @data: Intel HW specific hdcp data
 472  * @rep_topology: Receiver ID List to be validated
 473  * @rep_send_ack : repeater ack from ME FW.
 474  *
 475  * Return: 0 on Success, <0 on Failure
 476  */
 477 static int
 478 mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
 479                                          struct hdcp_port_data *data,
 480                                          struct hdcp2_rep_send_receiverid_list
 481                                                         *rep_topology,
 482                                          struct hdcp2_rep_send_ack
 483                                                         *rep_send_ack)
 484 {
 485         struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
 486         struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
 487         struct mei_cl_device *cldev;
 488         ssize_t byte;
 489 
 490         if (!dev || !rep_topology || !rep_send_ack || !data)
 491                 return -EINVAL;
 492 
 493         cldev = to_mei_cl_device(dev);
 494 
 495         verify_repeater_in.header.api_version = HDCP_API_VERSION;
 496         verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
 497         verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS;
 498         verify_repeater_in.header.buffer_len =
 499                                         WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
 500 
 501         verify_repeater_in.port.integrated_port_type = data->port_type;
 502         verify_repeater_in.port.physical_port = mei_get_ddi_index(data->port);
 503 
 504         memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
 505                HDCP_2_2_RXINFO_LEN);
 506         memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
 507                HDCP_2_2_SEQ_NUM_LEN);
 508         memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
 509                HDCP_2_2_V_PRIME_HALF_LEN);
 510         memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
 511                HDCP_2_2_RECEIVER_IDS_MAX_LEN);
 512 
 513         byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
 514                               sizeof(verify_repeater_in));
 515         if (byte < 0) {
 516                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 517                 return byte;
 518         }
 519 
 520         byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
 521                               sizeof(verify_repeater_out));
 522         if (byte < 0) {
 523                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 524                 return byte;
 525         }
 526 
 527         if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 528                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 529                         WIRED_VERIFY_REPEATER,
 530                         verify_repeater_out.header.status);
 531                 return -EIO;
 532         }
 533 
 534         memcpy(rep_send_ack->v, verify_repeater_out.v,
 535                HDCP_2_2_V_PRIME_HALF_LEN);
 536         rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
 537 
 538         return 0;
 539 }
 540 
 541 /**
 542  * mei_hdcp_verify_mprime() - Verify mprime.
 543  * @dev: device corresponding to the mei_cl_device
 544  * @data: Intel HW specific hdcp data
 545  * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
 546  *
 547  * Return: 0 on Success, <0 on Failure
 548  */
 549 static int mei_hdcp_verify_mprime(struct device *dev,
 550                                   struct hdcp_port_data *data,
 551                                   struct hdcp2_rep_stream_ready *stream_ready)
 552 {
 553         struct wired_cmd_repeater_auth_stream_req_in
 554                                         verify_mprime_in = { { 0 } };
 555         struct wired_cmd_repeater_auth_stream_req_out
 556                                         verify_mprime_out = { { 0 } };
 557         struct mei_cl_device *cldev;
 558         ssize_t byte;
 559 
 560         if (!dev || !stream_ready || !data)
 561                 return -EINVAL;
 562 
 563         cldev = to_mei_cl_device(dev);
 564 
 565         verify_mprime_in.header.api_version = HDCP_API_VERSION;
 566         verify_mprime_in.header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ;
 567         verify_mprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
 568         verify_mprime_in.header.buffer_len =
 569                         WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_MIN_IN;
 570 
 571         verify_mprime_in.port.integrated_port_type = data->port_type;
 572         verify_mprime_in.port.physical_port = mei_get_ddi_index(data->port);
 573 
 574         memcpy(verify_mprime_in.m_prime, stream_ready->m_prime,
 575                HDCP_2_2_MPRIME_LEN);
 576         drm_hdcp_cpu_to_be24(verify_mprime_in.seq_num_m, data->seq_num_m);
 577         memcpy(verify_mprime_in.streams, data->streams,
 578                (data->k * sizeof(struct hdcp2_streamid_type)));
 579 
 580         verify_mprime_in.k = cpu_to_be16(data->k);
 581 
 582         byte = mei_cldev_send(cldev, (u8 *)&verify_mprime_in,
 583                               sizeof(verify_mprime_in));
 584         if (byte < 0) {
 585                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 586                 return byte;
 587         }
 588 
 589         byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out,
 590                               sizeof(verify_mprime_out));
 591         if (byte < 0) {
 592                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 593                 return byte;
 594         }
 595 
 596         if (verify_mprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 597                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 598                         WIRED_REPEATER_AUTH_STREAM_REQ,
 599                         verify_mprime_out.header.status);
 600                 return -EIO;
 601         }
 602 
 603         return 0;
 604 }
 605 
 606 /**
 607  * mei_hdcp_enable_authentication() - Mark a port as authenticated
 608  * through ME FW
 609  * @dev: device corresponding to the mei_cl_device
 610  * @data: Intel HW specific hdcp data
 611  *
 612  * Return: 0 on Success, <0 on Failure
 613  */
 614 static int mei_hdcp_enable_authentication(struct device *dev,
 615                                           struct hdcp_port_data *data)
 616 {
 617         struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
 618         struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
 619         struct mei_cl_device *cldev;
 620         ssize_t byte;
 621 
 622         if (!dev || !data)
 623                 return -EINVAL;
 624 
 625         cldev = to_mei_cl_device(dev);
 626 
 627         enable_auth_in.header.api_version = HDCP_API_VERSION;
 628         enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
 629         enable_auth_in.header.status = ME_HDCP_STATUS_SUCCESS;
 630         enable_auth_in.header.buffer_len = WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
 631 
 632         enable_auth_in.port.integrated_port_type = data->port_type;
 633         enable_auth_in.port.physical_port = mei_get_ddi_index(data->port);
 634         enable_auth_in.stream_type = data->streams[0].stream_type;
 635 
 636         byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
 637                               sizeof(enable_auth_in));
 638         if (byte < 0) {
 639                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 640                 return byte;
 641         }
 642 
 643         byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
 644                               sizeof(enable_auth_out));
 645         if (byte < 0) {
 646                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 647                 return byte;
 648         }
 649 
 650         if (enable_auth_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 651                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 652                         WIRED_ENABLE_AUTH, enable_auth_out.header.status);
 653                 return -EIO;
 654         }
 655 
 656         return 0;
 657 }
 658 
 659 /**
 660  * mei_hdcp_close_session() - Close the Wired HDCP Tx session of ME FW per port.
 661  * This also disables the authenticated state of the port.
 662  * @dev: device corresponding to the mei_cl_device
 663  * @data: Intel HW specific hdcp data
 664  *
 665  * Return: 0 on Success, <0 on Failure
 666  */
 667 static int
 668 mei_hdcp_close_session(struct device *dev, struct hdcp_port_data *data)
 669 {
 670         struct wired_cmd_close_session_in session_close_in = { { 0 } };
 671         struct wired_cmd_close_session_out session_close_out = { { 0 } };
 672         struct mei_cl_device *cldev;
 673         ssize_t byte;
 674 
 675         if (!dev || !data)
 676                 return -EINVAL;
 677 
 678         cldev = to_mei_cl_device(dev);
 679 
 680         session_close_in.header.api_version = HDCP_API_VERSION;
 681         session_close_in.header.command_id = WIRED_CLOSE_SESSION;
 682         session_close_in.header.status = ME_HDCP_STATUS_SUCCESS;
 683         session_close_in.header.buffer_len =
 684                                 WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN;
 685 
 686         session_close_in.port.integrated_port_type = data->port_type;
 687         session_close_in.port.physical_port = mei_get_ddi_index(data->port);
 688 
 689         byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
 690                               sizeof(session_close_in));
 691         if (byte < 0) {
 692                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 693                 return byte;
 694         }
 695 
 696         byte = mei_cldev_recv(cldev, (u8 *)&session_close_out,
 697                               sizeof(session_close_out));
 698         if (byte < 0) {
 699                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 700                 return byte;
 701         }
 702 
 703         if (session_close_out.header.status != ME_HDCP_STATUS_SUCCESS) {
 704                 dev_dbg(dev, "Session Close Failed. status: 0x%X\n",
 705                         session_close_out.header.status);
 706                 return -EIO;
 707         }
 708 
 709         return 0;
 710 }
 711 
 712 static const struct i915_hdcp_component_ops mei_hdcp_ops = {
 713         .owner = THIS_MODULE,
 714         .initiate_hdcp2_session = mei_hdcp_initiate_session,
 715         .verify_receiver_cert_prepare_km =
 716                                 mei_hdcp_verify_receiver_cert_prepare_km,
 717         .verify_hprime = mei_hdcp_verify_hprime,
 718         .store_pairing_info = mei_hdcp_store_pairing_info,
 719         .initiate_locality_check = mei_hdcp_initiate_locality_check,
 720         .verify_lprime = mei_hdcp_verify_lprime,
 721         .get_session_key = mei_hdcp_get_session_key,
 722         .repeater_check_flow_prepare_ack =
 723                                 mei_hdcp_repeater_check_flow_prepare_ack,
 724         .verify_mprime = mei_hdcp_verify_mprime,
 725         .enable_hdcp_authentication = mei_hdcp_enable_authentication,
 726         .close_hdcp_session = mei_hdcp_close_session,
 727 };
 728 
 729 static int mei_component_master_bind(struct device *dev)
 730 {
 731         struct mei_cl_device *cldev = to_mei_cl_device(dev);
 732         struct i915_hdcp_comp_master *comp_master =
 733                                                 mei_cldev_get_drvdata(cldev);
 734         int ret;
 735 
 736         dev_dbg(dev, "%s\n", __func__);
 737         comp_master->ops = &mei_hdcp_ops;
 738         comp_master->mei_dev = dev;
 739         ret = component_bind_all(dev, comp_master);
 740         if (ret < 0)
 741                 return ret;
 742 
 743         return 0;
 744 }
 745 
 746 static void mei_component_master_unbind(struct device *dev)
 747 {
 748         struct mei_cl_device *cldev = to_mei_cl_device(dev);
 749         struct i915_hdcp_comp_master *comp_master =
 750                                                 mei_cldev_get_drvdata(cldev);
 751 
 752         dev_dbg(dev, "%s\n", __func__);
 753         component_unbind_all(dev, comp_master);
 754 }
 755 
 756 static const struct component_master_ops mei_component_master_ops = {
 757         .bind = mei_component_master_bind,
 758         .unbind = mei_component_master_unbind,
 759 };
 760 
 761 /**
 762  * mei_hdcp_component_match - compare function for matching mei hdcp.
 763  *
 764  *    The function checks if the driver is i915, the subcomponent is HDCP
 765  *    and the grand parent of hdcp and the parent of i915 are the same
 766  *    PCH device.
 767  *
 768  * @dev: master device
 769  * @subcomponent: subcomponent to match (I915_COMPONENT_HDCP)
 770  * @data: compare data (mei hdcp device)
 771  *
 772  * Return:
 773  * * 1 - if components match
 774  * * 0 - otherwise
 775  */
 776 static int mei_hdcp_component_match(struct device *dev, int subcomponent,
 777                                     void *data)
 778 {
 779         struct device *base = data;
 780 
 781         if (strcmp(dev->driver->name, "i915") ||
 782             subcomponent != I915_COMPONENT_HDCP)
 783                 return 0;
 784 
 785         base = base->parent;
 786         if (!base)
 787                 return 0;
 788 
 789         base = base->parent;
 790         dev = dev->parent;
 791 
 792         return (base && dev && dev == base);
 793 }
 794 
 795 static int mei_hdcp_probe(struct mei_cl_device *cldev,
 796                           const struct mei_cl_device_id *id)
 797 {
 798         struct i915_hdcp_comp_master *comp_master;
 799         struct component_match *master_match;
 800         int ret;
 801 
 802         ret = mei_cldev_enable(cldev);
 803         if (ret < 0) {
 804                 dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
 805                 goto enable_err_exit;
 806         }
 807 
 808         comp_master = kzalloc(sizeof(*comp_master), GFP_KERNEL);
 809         if (!comp_master) {
 810                 ret = -ENOMEM;
 811                 goto err_exit;
 812         }
 813 
 814         master_match = NULL;
 815         component_match_add_typed(&cldev->dev, &master_match,
 816                                   mei_hdcp_component_match, &cldev->dev);
 817         if (IS_ERR_OR_NULL(master_match)) {
 818                 ret = -ENOMEM;
 819                 goto err_exit;
 820         }
 821 
 822         mei_cldev_set_drvdata(cldev, comp_master);
 823         ret = component_master_add_with_match(&cldev->dev,
 824                                               &mei_component_master_ops,
 825                                               master_match);
 826         if (ret < 0) {
 827                 dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
 828                 goto err_exit;
 829         }
 830 
 831         return 0;
 832 
 833 err_exit:
 834         mei_cldev_set_drvdata(cldev, NULL);
 835         kfree(comp_master);
 836         mei_cldev_disable(cldev);
 837 enable_err_exit:
 838         return ret;
 839 }
 840 
 841 static int mei_hdcp_remove(struct mei_cl_device *cldev)
 842 {
 843         struct i915_hdcp_comp_master *comp_master =
 844                                                 mei_cldev_get_drvdata(cldev);
 845 
 846         component_master_del(&cldev->dev, &mei_component_master_ops);
 847         kfree(comp_master);
 848         mei_cldev_set_drvdata(cldev, NULL);
 849 
 850         return mei_cldev_disable(cldev);
 851 }
 852 
 853 #define MEI_UUID_HDCP GUID_INIT(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \
 854                                 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
 855 
 856 static struct mei_cl_device_id mei_hdcp_tbl[] = {
 857         { .uuid = MEI_UUID_HDCP, .version = MEI_CL_VERSION_ANY },
 858         { }
 859 };
 860 MODULE_DEVICE_TABLE(mei, mei_hdcp_tbl);
 861 
 862 static struct mei_cl_driver mei_hdcp_driver = {
 863         .id_table = mei_hdcp_tbl,
 864         .name = KBUILD_MODNAME,
 865         .probe = mei_hdcp_probe,
 866         .remove = mei_hdcp_remove,
 867 };
 868 
 869 module_mei_cl_driver(mei_hdcp_driver);
 870 
 871 MODULE_AUTHOR("Intel Corporation");
 872 MODULE_LICENSE("GPL");
 873 MODULE_DESCRIPTION("MEI HDCP");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/misc/mei/hdcp/mei_hdcp.c

DEFINITIONS
