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/pci.h>
  21 #include <linux/slab.h>
  22 #include <linux/mei.h>
  23 #include <linux/mei_cl_bus.h>
  24 #include <linux/component.h>
  25 #include <drm/drm_connector.h>
  26 #include <drm/intel/i915_component.h>
  27 #include <drm/intel/i915_hdcp_interface.h>
  28
  29 #include "mei_hdcp.h"
  30
  31 /**
  32  * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW
  33  * @dev: device corresponding to the mei_cl_device
  34  * @data: Intel HW specific hdcp data
  35  * @ake_data: AKE_Init msg output.
  36  *
  37  * Return:  0 on Success, <0 on Failure.
  38  */
  39 static int
  40 mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
  41                           struct hdcp2_ake_init *ake_data)
  42 {
  43         struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
  44         struct wired_cmd_initiate_hdcp2_session_out
  45                                                 session_init_out = { { 0 } };
  46         struct mei_cl_device *cldev;
  47         ssize_t byte;
  48
  49         if (!dev || !data || !ake_data)
  50                 return -EINVAL;
  51
  52         cldev = to_mei_cl_device(dev);
  53
  54         session_init_in.header.api_version = HDCP_API_VERSION;
  55         session_init_in.header.command_id = WIRED_INITIATE_HDCP2_SESSION;
  56         session_init_in.header.status = FW_HDCP_STATUS_SUCCESS;
  57         session_init_in.header.buffer_len =
  58                                 WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
  59
  60         session_init_in.port.integrated_port_type = data->port_type;
  61         session_init_in.port.physical_port = (u8)data->hdcp_ddi;
  62         session_init_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
  63         session_init_in.protocol = data->protocol;
  64
  65         byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
  66                               sizeof(session_init_in));
  67         if (byte < 0) {
  68                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
  69                 return byte;
  70         }
  71
  72         byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
  73                               sizeof(session_init_out));
  74         if (byte < 0) {
  75                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
  76                 return byte;
  77         }
  78
  79         if (session_init_out.header.status != FW_HDCP_STATUS_SUCCESS) {
  80                 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
  81                         WIRED_INITIATE_HDCP2_SESSION,
  82                         session_init_out.header.status);
  83                 return -EIO;
  84         }
  85
  86         ake_data->msg_id = HDCP_2_2_AKE_INIT;
  87         ake_data->tx_caps = session_init_out.tx_caps;
  88         memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);
  89
  90         return 0;
  91 }
  92
  93 /**
  94  * mei_hdcp_verify_receiver_cert_prepare_km() - Verify the Receiver Certificate
  95  * AKE_Send_Cert and prepare AKE_Stored_Km/AKE_No_Stored_Km
  96  * @dev: device corresponding to the mei_cl_device
  97  * @data: Intel HW specific hdcp data
  98  * @rx_cert: AKE_Send_Cert for verification
  99  * @km_stored: Pairing status flag output
 100  * @ek_pub_km: AKE_Stored_Km/AKE_No_Stored_Km output msg
 101  * @msg_sz : size of AKE_XXXXX_Km output msg
 102  *
 103  * Return: 0 on Success, <0 on Failure
 104  */
 105 static int
 106 mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev,
 107                                          struct hdcp_port_data *data,
 108                                          struct hdcp2_ake_send_cert *rx_cert,
 109                                          bool *km_stored,
 110                                          struct hdcp2_ake_no_stored_km
 111                                                                 *ek_pub_km,
 112                                          size_t *msg_sz)
 113 {
 114         struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } };
 115         struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } };
 116         struct mei_cl_device *cldev;
 117         ssize_t byte;
 118
 119         if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
 120                 return -EINVAL;
 121
 122         cldev = to_mei_cl_device(dev);
 123
 124         verify_rxcert_in.header.api_version = HDCP_API_VERSION;
 125         verify_rxcert_in.header.command_id = WIRED_VERIFY_RECEIVER_CERT;
 126         verify_rxcert_in.header.status = FW_HDCP_STATUS_SUCCESS;
 127         verify_rxcert_in.header.buffer_len =
 128                                 WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN;
 129
 130         verify_rxcert_in.port.integrated_port_type = data->port_type;
 131         verify_rxcert_in.port.physical_port = (u8)data->hdcp_ddi;
 132         verify_rxcert_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 133
 134         verify_rxcert_in.cert_rx = rx_cert->cert_rx;
 135         memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN);
 136         memcpy(verify_rxcert_in.rx_caps, rx_cert->rx_caps, HDCP_2_2_RXCAPS_LEN);
 137
 138         byte = mei_cldev_send(cldev, (u8 *)&verify_rxcert_in,
 139                               sizeof(verify_rxcert_in));
 140         if (byte < 0) {
 141                 dev_dbg(dev, "mei_cldev_send failed: %zd\n", byte);
 142                 return byte;
 143         }
 144
 145         byte = mei_cldev_recv(cldev, (u8 *)&verify_rxcert_out,
 146                               sizeof(verify_rxcert_out));
 147         if (byte < 0) {
 148                 dev_dbg(dev, "mei_cldev_recv failed: %zd\n", byte);
 149                 return byte;
 150         }
 151
 152         if (verify_rxcert_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 153                 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
 154                         WIRED_VERIFY_RECEIVER_CERT,
 155                         verify_rxcert_out.header.status);
 156                 return -EIO;
 157         }
 158
 159         *km_stored = !!verify_rxcert_out.km_stored;
 160         if (verify_rxcert_out.km_stored) {
 161                 ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM;
 162                 *msg_sz = sizeof(struct hdcp2_ake_stored_km);
 163         } else {
 164                 ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM;
 165                 *msg_sz = sizeof(struct hdcp2_ake_no_stored_km);
 166         }
 167
 168         memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff,
 169                sizeof(verify_rxcert_out.ekm_buff));
 170
 171         return 0;
 172 }
 173
 174 /**
 175  * mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
 176  * @dev: device corresponding to the mei_cl_device
 177  * @data: Intel HW specific hdcp data
 178  * @rx_hprime: AKE_Send_H_prime msg for ME FW verification
 179  *
 180  * Return: 0 on Success, <0 on Failure
 181  */
 182 static int
 183 mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
 184                        struct hdcp2_ake_send_hprime *rx_hprime)
 185 {
 186         struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
 187         struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
 188         struct mei_cl_device *cldev;
 189         ssize_t byte;
 190
 191         if (!dev || !data || !rx_hprime)
 192                 return -EINVAL;
 193
 194         cldev = to_mei_cl_device(dev);
 195
 196         send_hprime_in.header.api_version = HDCP_API_VERSION;
 197         send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
 198         send_hprime_in.header.status = FW_HDCP_STATUS_SUCCESS;
 199         send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
 200
 201         send_hprime_in.port.integrated_port_type = data->port_type;
 202         send_hprime_in.port.physical_port = (u8)data->hdcp_ddi;
 203         send_hprime_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 204
 205         memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
 206                HDCP_2_2_H_PRIME_LEN);
 207
 208         byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
 209                               sizeof(send_hprime_in));
 210         if (byte < 0) {
 211                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 212                 return byte;
 213         }
 214
 215         byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
 216                               sizeof(send_hprime_out));
 217         if (byte < 0) {
 218                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 219                 return byte;
 220         }
 221
 222         if (send_hprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 223                 dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
 224                         WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status);
 225                 return -EIO;
 226         }
 227
 228         return 0;
 229 }
 230
 231 /**
 232  * mei_hdcp_store_pairing_info() - Store pairing info received at ME FW
 233  * @dev: device corresponding to the mei_cl_device
 234  * @data: Intel HW specific hdcp data
 235  * @pairing_info: AKE_Send_Pairing_Info msg input to ME FW
 236  *
 237  * Return: 0 on Success, <0 on Failure
 238  */
 239 static int
 240 mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
 241                             struct hdcp2_ake_send_pairing_info *pairing_info)
 242 {
 243         struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
 244         struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
 245         struct mei_cl_device *cldev;
 246         ssize_t byte;
 247
 248         if (!dev || !data || !pairing_info)
 249                 return -EINVAL;
 250
 251         cldev = to_mei_cl_device(dev);
 252
 253         pairing_info_in.header.api_version = HDCP_API_VERSION;
 254         pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
 255         pairing_info_in.header.status = FW_HDCP_STATUS_SUCCESS;
 256         pairing_info_in.header.buffer_len =
 257                                         WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;
 258
 259         pairing_info_in.port.integrated_port_type = data->port_type;
 260         pairing_info_in.port.physical_port = (u8)data->hdcp_ddi;
 261         pairing_info_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 262
 263         memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
 264                HDCP_2_2_E_KH_KM_LEN);
 265
 266         byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
 267                               sizeof(pairing_info_in));
 268         if (byte < 0) {
 269                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 270                 return byte;
 271         }
 272
 273         byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
 274                               sizeof(pairing_info_out));
 275         if (byte < 0) {
 276                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 277                 return byte;
 278         }
 279
 280         if (pairing_info_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 281                 dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
 282                         WIRED_AKE_SEND_PAIRING_INFO,
 283                         pairing_info_out.header.status);
 284                 return -EIO;
 285         }
 286
 287         return 0;
 288 }
 289
 290 /**
 291  * mei_hdcp_initiate_locality_check() - Prepare LC_Init
 292  * @dev: device corresponding to the mei_cl_device
 293  * @data: Intel HW specific hdcp data
 294  * @lc_init_data: LC_Init msg output
 295  *
 296  * Return: 0 on Success, <0 on Failure
 297  */
 298 static int
 299 mei_hdcp_initiate_locality_check(struct device *dev,
 300                                  struct hdcp_port_data *data,
 301                                  struct hdcp2_lc_init *lc_init_data)
 302 {
 303         struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
 304         struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
 305         struct mei_cl_device *cldev;
 306         ssize_t byte;
 307
 308         if (!dev || !data || !lc_init_data)
 309                 return -EINVAL;
 310
 311         cldev = to_mei_cl_device(dev);
 312
 313         lc_init_in.header.api_version = HDCP_API_VERSION;
 314         lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
 315         lc_init_in.header.status = FW_HDCP_STATUS_SUCCESS;
 316         lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;
 317
 318         lc_init_in.port.integrated_port_type = data->port_type;
 319         lc_init_in.port.physical_port = (u8)data->hdcp_ddi;
 320         lc_init_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 321
 322         byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
 323         if (byte < 0) {
 324                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 325                 return byte;
 326         }
 327
 328         byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));
 329         if (byte < 0) {
 330                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 331                 return byte;
 332         }
 333
 334         if (lc_init_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 335                 dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
 336                         WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
 337                 return -EIO;
 338         }
 339
 340         lc_init_data->msg_id = HDCP_2_2_LC_INIT;
 341         memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);
 342
 343         return 0;
 344 }
 345
 346 /**
 347  * mei_hdcp_verify_lprime() - Verify lprime.
 348  * @dev: device corresponding to the mei_cl_device
 349  * @data: Intel HW specific hdcp data
 350  * @rx_lprime: LC_Send_L_prime msg for ME FW verification
 351  *
 352  * Return: 0 on Success, <0 on Failure
 353  */
 354 static int
 355 mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
 356                        struct hdcp2_lc_send_lprime *rx_lprime)
 357 {
 358         struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } };
 359         struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } };
 360         struct mei_cl_device *cldev;
 361         ssize_t byte;
 362
 363         if (!dev || !data || !rx_lprime)
 364                 return -EINVAL;
 365
 366         cldev = to_mei_cl_device(dev);
 367
 368         verify_lprime_in.header.api_version = HDCP_API_VERSION;
 369         verify_lprime_in.header.command_id = WIRED_VALIDATE_LOCALITY;
 370         verify_lprime_in.header.status = FW_HDCP_STATUS_SUCCESS;
 371         verify_lprime_in.header.buffer_len =
 372                                         WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN;
 373
 374         verify_lprime_in.port.integrated_port_type = data->port_type;
 375         verify_lprime_in.port.physical_port = (u8)data->hdcp_ddi;
 376         verify_lprime_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 377
 378         memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime,
 379                HDCP_2_2_L_PRIME_LEN);
 380
 381         byte = mei_cldev_send(cldev, (u8 *)&verify_lprime_in,
 382                               sizeof(verify_lprime_in));
 383         if (byte < 0) {
 384                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 385                 return byte;
 386         }
 387
 388         byte = mei_cldev_recv(cldev, (u8 *)&verify_lprime_out,
 389                               sizeof(verify_lprime_out));
 390         if (byte < 0) {
 391                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 392                 return byte;
 393         }
 394
 395         if (verify_lprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 396                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 397                         WIRED_VALIDATE_LOCALITY,
 398                         verify_lprime_out.header.status);
 399                 return -EIO;
 400         }
 401
 402         return 0;
 403 }
 404
 405 /**
 406  * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks.
 407  * @dev: device corresponding to the mei_cl_device
 408  * @data: Intel HW specific hdcp data
 409  * @ske_data: SKE_Send_Eks msg output from ME FW.
 410  *
 411  * Return: 0 on Success, <0 on Failure
 412  */
 413 static int mei_hdcp_get_session_key(struct device *dev,
 414                                     struct hdcp_port_data *data,
 415                                     struct hdcp2_ske_send_eks *ske_data)
 416 {
 417         struct wired_cmd_get_session_key_in get_skey_in = { { 0 } };
 418         struct wired_cmd_get_session_key_out get_skey_out = { { 0 } };
 419         struct mei_cl_device *cldev;
 420         ssize_t byte;
 421
 422         if (!dev || !data || !ske_data)
 423                 return -EINVAL;
 424
 425         cldev = to_mei_cl_device(dev);
 426
 427         get_skey_in.header.api_version = HDCP_API_VERSION;
 428         get_skey_in.header.command_id = WIRED_GET_SESSION_KEY;
 429         get_skey_in.header.status = FW_HDCP_STATUS_SUCCESS;
 430         get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN;
 431
 432         get_skey_in.port.integrated_port_type = data->port_type;
 433         get_skey_in.port.physical_port = (u8)data->hdcp_ddi;
 434         get_skey_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 435
 436         byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in));
 437         if (byte < 0) {
 438                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 439                 return byte;
 440         }
 441
 442         byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out));
 443
 444         if (byte < 0) {
 445                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 446                 return byte;
 447         }
 448
 449         if (get_skey_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 450                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 451                         WIRED_GET_SESSION_KEY, get_skey_out.header.status);
 452                 return -EIO;
 453         }
 454
 455         ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS;
 456         memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks,
 457                HDCP_2_2_E_DKEY_KS_LEN);
 458         memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN);
 459
 460         return 0;
 461 }
 462
 463 /**
 464  * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream topology
 465  * and prepare rep_ack.
 466  * @dev: device corresponding to the mei_cl_device
 467  * @data: Intel HW specific hdcp data
 468  * @rep_topology: Receiver ID List to be validated
 469  * @rep_send_ack : repeater ack from ME FW.
 470  *
 471  * Return: 0 on Success, <0 on Failure
 472  */
 473 static int
 474 mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
 475                                          struct hdcp_port_data *data,
 476                                          struct hdcp2_rep_send_receiverid_list
 477                                                         *rep_topology,
 478                                          struct hdcp2_rep_send_ack
 479                                                         *rep_send_ack)
 480 {
 481         struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
 482         struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
 483         struct mei_cl_device *cldev;
 484         ssize_t byte;
 485
 486         if (!dev || !rep_topology || !rep_send_ack || !data)
 487                 return -EINVAL;
 488
 489         cldev = to_mei_cl_device(dev);
 490
 491         verify_repeater_in.header.api_version = HDCP_API_VERSION;
 492         verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
 493         verify_repeater_in.header.status = FW_HDCP_STATUS_SUCCESS;
 494         verify_repeater_in.header.buffer_len =
 495                                         WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
 496
 497         verify_repeater_in.port.integrated_port_type = data->port_type;
 498         verify_repeater_in.port.physical_port = (u8)data->hdcp_ddi;
 499         verify_repeater_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 500
 501         memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
 502                HDCP_2_2_RXINFO_LEN);
 503         memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
 504                HDCP_2_2_SEQ_NUM_LEN);
 505         memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
 506                HDCP_2_2_V_PRIME_HALF_LEN);
 507         memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
 508                HDCP_2_2_RECEIVER_IDS_MAX_LEN);
 509
 510         byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
 511                               sizeof(verify_repeater_in));
 512         if (byte < 0) {
 513                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 514                 return byte;
 515         }
 516
 517         byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
 518                               sizeof(verify_repeater_out));
 519         if (byte < 0) {
 520                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 521                 return byte;
 522         }
 523
 524         if (verify_repeater_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 525                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 526                         WIRED_VERIFY_REPEATER,
 527                         verify_repeater_out.header.status);
 528                 return -EIO;
 529         }
 530
 531         memcpy(rep_send_ack->v, verify_repeater_out.v,
 532                HDCP_2_2_V_PRIME_HALF_LEN);
 533         rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
 534
 535         return 0;
 536 }
 537
 538 /**
 539  * mei_hdcp_verify_mprime() - Verify mprime.
 540  * @dev: device corresponding to the mei_cl_device
 541  * @data: Intel HW specific hdcp data
 542  * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
 543  *
 544  * Return: 0 on Success, <0 on Failure
 545  */
 546 static int mei_hdcp_verify_mprime(struct device *dev,
 547                                   struct hdcp_port_data *data,
 548                                   struct hdcp2_rep_stream_ready *stream_ready)
 549 {
 550         struct wired_cmd_repeater_auth_stream_req_in *verify_mprime_in;
 551         struct wired_cmd_repeater_auth_stream_req_out
 552                                         verify_mprime_out = { { 0 } };
 553         struct mei_cl_device *cldev;
 554         ssize_t byte;
 555         size_t cmd_size;
 556
 557         if (!dev || !stream_ready || !data)
 558                 return -EINVAL;
 559
 560         cldev = to_mei_cl_device(dev);
 561
 562         cmd_size = struct_size(verify_mprime_in, streams, data->k);
 563         if (cmd_size == SIZE_MAX)
 564                 return -EINVAL;
 565
 566         verify_mprime_in = kzalloc(cmd_size, GFP_KERNEL);
 567         if (!verify_mprime_in)
 568                 return -ENOMEM;
 569
 570         verify_mprime_in->header.api_version = HDCP_API_VERSION;
 571         verify_mprime_in->header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ;
 572         verify_mprime_in->header.status = FW_HDCP_STATUS_SUCCESS;
 573         verify_mprime_in->header.buffer_len = cmd_size  - sizeof(verify_mprime_in->header);
 574
 575         verify_mprime_in->port.integrated_port_type = data->port_type;
 576         verify_mprime_in->port.physical_port = (u8)data->hdcp_ddi;
 577         verify_mprime_in->port.attached_transcoder = (u8)data->hdcp_transcoder;
 578
 579         memcpy(verify_mprime_in->m_prime, stream_ready->m_prime, HDCP_2_2_MPRIME_LEN);
 580         drm_hdcp_cpu_to_be24(verify_mprime_in->seq_num_m, data->seq_num_m);
 581
 582         memcpy(verify_mprime_in->streams, data->streams,
 583                array_size(data->k, sizeof(*data->streams)));
 584
 585         verify_mprime_in->k = cpu_to_be16(data->k);
 586
 587         byte = mei_cldev_send(cldev, (u8 *)verify_mprime_in, cmd_size);
 588         kfree(verify_mprime_in);
 589         if (byte < 0) {
 590                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 591                 return byte;
 592         }
 593
 594         byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out,
 595                               sizeof(verify_mprime_out));
 596         if (byte < 0) {
 597                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 598                 return byte;
 599         }
 600
 601         if (verify_mprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 602                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 603                         WIRED_REPEATER_AUTH_STREAM_REQ,
 604                         verify_mprime_out.header.status);
 605                 return -EIO;
 606         }
 607
 608         return 0;
 609 }
 610
 611 /**
 612  * mei_hdcp_enable_authentication() - Mark a port as authenticated
 613  * through ME FW
 614  * @dev: device corresponding to the mei_cl_device
 615  * @data: Intel HW specific hdcp data
 616  *
 617  * Return: 0 on Success, <0 on Failure
 618  */
 619 static int mei_hdcp_enable_authentication(struct device *dev,
 620                                           struct hdcp_port_data *data)
 621 {
 622         struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
 623         struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
 624         struct mei_cl_device *cldev;
 625         ssize_t byte;
 626
 627         if (!dev || !data)
 628                 return -EINVAL;
 629
 630         cldev = to_mei_cl_device(dev);
 631
 632         enable_auth_in.header.api_version = HDCP_API_VERSION;
 633         enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
 634         enable_auth_in.header.status = FW_HDCP_STATUS_SUCCESS;
 635         enable_auth_in.header.buffer_len = WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
 636
 637         enable_auth_in.port.integrated_port_type = data->port_type;
 638         enable_auth_in.port.physical_port = (u8)data->hdcp_ddi;
 639         enable_auth_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 640         enable_auth_in.stream_type = data->streams[0].stream_type;
 641
 642         byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
 643                               sizeof(enable_auth_in));
 644         if (byte < 0) {
 645                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 646                 return byte;
 647         }
 648
 649         byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
 650                               sizeof(enable_auth_out));
 651         if (byte < 0) {
 652                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 653                 return byte;
 654         }
 655
 656         if (enable_auth_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 657                 dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
 658                         WIRED_ENABLE_AUTH, enable_auth_out.header.status);
 659                 return -EIO;
 660         }
 661
 662         return 0;
 663 }
 664
 665 /**
 666  * mei_hdcp_close_session() - Close the Wired HDCP Tx session of ME FW per port.
 667  * This also disables the authenticated state of the port.
 668  * @dev: device corresponding to the mei_cl_device
 669  * @data: Intel HW specific hdcp data
 670  *
 671  * Return: 0 on Success, <0 on Failure
 672  */
 673 static int
 674 mei_hdcp_close_session(struct device *dev, struct hdcp_port_data *data)
 675 {
 676         struct wired_cmd_close_session_in session_close_in = { { 0 } };
 677         struct wired_cmd_close_session_out session_close_out = { { 0 } };
 678         struct mei_cl_device *cldev;
 679         ssize_t byte;
 680
 681         if (!dev || !data)
 682                 return -EINVAL;
 683
 684         cldev = to_mei_cl_device(dev);
 685
 686         session_close_in.header.api_version = HDCP_API_VERSION;
 687         session_close_in.header.command_id = WIRED_CLOSE_SESSION;
 688         session_close_in.header.status = FW_HDCP_STATUS_SUCCESS;
 689         session_close_in.header.buffer_len =
 690                                 WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN;
 691
 692         session_close_in.port.integrated_port_type = data->port_type;
 693         session_close_in.port.physical_port = (u8)data->hdcp_ddi;
 694         session_close_in.port.attached_transcoder = (u8)data->hdcp_transcoder;
 695
 696         byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
 697                               sizeof(session_close_in));
 698         if (byte < 0) {
 699                 dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
 700                 return byte;
 701         }
 702
 703         byte = mei_cldev_recv(cldev, (u8 *)&session_close_out,
 704                               sizeof(session_close_out));
 705         if (byte < 0) {
 706                 dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
 707                 return byte;
 708         }
 709
 710         if (session_close_out.header.status != FW_HDCP_STATUS_SUCCESS) {
 711                 dev_dbg(dev, "Session Close Failed. status: 0x%X\n",
 712                         session_close_out.header.status);
 713                 return -EIO;
 714         }
 715
 716         return 0;
 717 }
 718
 719 static const struct i915_hdcp_ops mei_hdcp_ops = {
 720         .owner = THIS_MODULE,
 721         .initiate_hdcp2_session = mei_hdcp_initiate_session,
 722         .verify_receiver_cert_prepare_km =
 723                                 mei_hdcp_verify_receiver_cert_prepare_km,
 724         .verify_hprime = mei_hdcp_verify_hprime,
 725         .store_pairing_info = mei_hdcp_store_pairing_info,
 726         .initiate_locality_check = mei_hdcp_initiate_locality_check,
 727         .verify_lprime = mei_hdcp_verify_lprime,
 728         .get_session_key = mei_hdcp_get_session_key,
 729         .repeater_check_flow_prepare_ack =
 730                                 mei_hdcp_repeater_check_flow_prepare_ack,
 731         .verify_mprime = mei_hdcp_verify_mprime,
 732         .enable_hdcp_authentication = mei_hdcp_enable_authentication,
 733         .close_hdcp_session = mei_hdcp_close_session,
 734 };
 735
 736 static int mei_component_master_bind(struct device *dev)
 737 {
 738         struct mei_cl_device *cldev = to_mei_cl_device(dev);
 739         struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
 740         int ret;
 741
 742         dev_dbg(dev, "%s\n", __func__);
 743         comp_arbiter->ops = &mei_hdcp_ops;
 744         comp_arbiter->hdcp_dev = dev;
 745         ret = component_bind_all(dev, comp_arbiter);
 746         if (ret < 0)
 747                 return ret;
 748
 749         return 0;
 750 }
 751
 752 static void mei_component_master_unbind(struct device *dev)
 753 {
 754         struct mei_cl_device *cldev = to_mei_cl_device(dev);
 755         struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
 756
 757         dev_dbg(dev, "%s\n", __func__);
 758         component_unbind_all(dev, comp_arbiter);
 759 }
 760
 761 static const struct component_master_ops mei_component_master_ops = {
 762         .bind = mei_component_master_bind,
 763         .unbind = mei_component_master_unbind,
 764 };
 765
 766 /**
 767  * mei_hdcp_component_match - compare function for matching mei hdcp.
 768  *
 769  *    The function checks if the driver is i915, the subcomponent is HDCP
 770  *    and the grand parent of hdcp and the parent of i915 are the same
 771  *    PCH device.
 772  *
 773  * @dev: master device
 774  * @subcomponent: subcomponent to match (I915_COMPONENT_HDCP)
 775  * @data: compare data (mei hdcp device)
 776  *
 777  * Return:
 778  * * 1 - if components match
 779  * * 0 - otherwise
 780  */
 781 static int mei_hdcp_component_match(struct device *dev, int subcomponent,
 782                                     void *data)
 783 {
 784         struct device *base = data;
 785         struct pci_dev *pdev;
 786
 787         if (!dev_is_pci(dev))
 788                 return 0;
 789
 790         pdev = to_pci_dev(dev);
 791
 792         if (pdev->class != (PCI_CLASS_DISPLAY_VGA << 8) ||
 793             pdev->vendor != PCI_VENDOR_ID_INTEL)
 794                 return 0;
 795
 796         if (subcomponent != I915_COMPONENT_HDCP)
 797                 return 0;
 798
 799         base = base->parent;
 800         if (!base)
 801                 return 0;
 802
 803         base = base->parent;
 804         dev = dev->parent;
 805
 806         return (base && dev && dev == base);
 807 }
 808
 809 static int mei_hdcp_probe(struct mei_cl_device *cldev,
 810                           const struct mei_cl_device_id *id)
 811 {
 812         struct i915_hdcp_arbiter *comp_arbiter;
 813         struct component_match *master_match;
 814         int ret;
 815
 816         ret = mei_cldev_enable(cldev);
 817         if (ret < 0) {
 818                 dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
 819                 goto enable_err_exit;
 820         }
 821
 822         comp_arbiter = kzalloc(sizeof(*comp_arbiter), GFP_KERNEL);
 823         if (!comp_arbiter) {
 824                 ret = -ENOMEM;
 825                 goto err_exit;
 826         }
 827
 828         master_match = NULL;
 829         component_match_add_typed(&cldev->dev, &master_match,
 830                                   mei_hdcp_component_match, &cldev->dev);
 831         if (IS_ERR_OR_NULL(master_match)) {
 832                 ret = -ENOMEM;
 833                 goto err_exit;
 834         }
 835
 836         mei_cldev_set_drvdata(cldev, comp_arbiter);
 837         ret = component_master_add_with_match(&cldev->dev,
 838                                               &mei_component_master_ops,
 839                                               master_match);
 840         if (ret < 0) {
 841                 dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
 842                 goto err_exit;
 843         }
 844
 845         return 0;
 846
 847 err_exit:
 848         mei_cldev_set_drvdata(cldev, NULL);
 849         kfree(comp_arbiter);
 850         mei_cldev_disable(cldev);
 851 enable_err_exit:
 852         return ret;
 853 }
 854
 855 static void mei_hdcp_remove(struct mei_cl_device *cldev)
 856 {
 857         struct i915_hdcp_arbiter *comp_arbiter = mei_cldev_get_drvdata(cldev);
 858         int ret;
 859
 860         component_master_del(&cldev->dev, &mei_component_master_ops);
 861         kfree(comp_arbiter);
 862         mei_cldev_set_drvdata(cldev, NULL);
 863
 864         ret = mei_cldev_disable(cldev);
 865         if (ret)
 866                 dev_warn(&cldev->dev, "mei_cldev_disable() failed\n");
 867 }
 868
 869 #define MEI_UUID_HDCP UUID_LE(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \
 870                               0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
 871
 872 static const struct mei_cl_device_id mei_hdcp_tbl[] = {
 873         { .uuid = MEI_UUID_HDCP, .version = MEI_CL_VERSION_ANY },
 874         { }
 875 };
 876 MODULE_DEVICE_TABLE(mei, mei_hdcp_tbl);
 877
 878 static struct mei_cl_driver mei_hdcp_driver = {
 879         .id_table = mei_hdcp_tbl,
 880         .name = KBUILD_MODNAME,
 881         .probe = mei_hdcp_probe,
 882         .remove = mei_hdcp_remove,
 883 };
 884
 885 module_mei_cl_driver(mei_hdcp_driver);
 886
 887 MODULE_AUTHOR("Intel Corporation");
 888 MODULE_LICENSE("GPL");
 889 MODULE_DESCRIPTION("MEI HDCP");