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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright © 2019 Intel Corporation
0004  *
0005  * mei_hdcp.c: HDCP client driver for mei bus
0006  *
0007  * Author:
0008  * Ramalingam C <ramalingam.c@intel.com>
0009  */
0010 
0011 /**
0012  * DOC: MEI_HDCP Client Driver
0013  *
0014  * The mei_hdcp driver acts as a translation layer between HDCP 2.2
0015  * protocol  implementer (I915) and ME FW by translating HDCP2.2
0016  * negotiation messages to ME FW command payloads and vice versa.
0017  */
0018 
0019 #include <linux/module.h>
0020 #include <linux/slab.h>
0021 #include <linux/uuid.h>
0022 #include <linux/mei_cl_bus.h>
0023 #include <linux/component.h>
0024 #include <drm/drm_connector.h>
0025 #include <drm/i915_component.h>
0026 #include <drm/i915_mei_hdcp_interface.h>
0027 
0028 #include "mei_hdcp.h"
0029 
0030 /**
0031  * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW
0032  * @dev: device corresponding to the mei_cl_device
0033  * @data: Intel HW specific hdcp data
0034  * @ake_data: AKE_Init msg output.
0035  *
0036  * Return:  0 on Success, <0 on Failure.
0037  */
0038 static int
0039 mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
0040               struct hdcp2_ake_init *ake_data)
0041 {
0042     struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
0043     struct wired_cmd_initiate_hdcp2_session_out
0044                         session_init_out = { { 0 } };
0045     struct mei_cl_device *cldev;
0046     ssize_t byte;
0047 
0048     if (!dev || !data || !ake_data)
0049         return -EINVAL;
0050 
0051     cldev = to_mei_cl_device(dev);
0052 
0053     session_init_in.header.api_version = HDCP_API_VERSION;
0054     session_init_in.header.command_id = WIRED_INITIATE_HDCP2_SESSION;
0055     session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
0056     session_init_in.header.buffer_len =
0057                 WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
0058 
0059     session_init_in.port.integrated_port_type = data->port_type;
0060     session_init_in.port.physical_port = (u8)data->fw_ddi;
0061     session_init_in.port.attached_transcoder = (u8)data->fw_tc;
0062     session_init_in.protocol = data->protocol;
0063 
0064     byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
0065                   sizeof(session_init_in));
0066     if (byte < 0) {
0067         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0068         return byte;
0069     }
0070 
0071     byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
0072                   sizeof(session_init_out));
0073     if (byte < 0) {
0074         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0075         return byte;
0076     }
0077 
0078     if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0079         dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
0080             WIRED_INITIATE_HDCP2_SESSION,
0081             session_init_out.header.status);
0082         return -EIO;
0083     }
0084 
0085     ake_data->msg_id = HDCP_2_2_AKE_INIT;
0086     ake_data->tx_caps = session_init_out.tx_caps;
0087     memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);
0088 
0089     return 0;
0090 }
0091 
0092 /**
0093  * mei_hdcp_verify_receiver_cert_prepare_km() - Verify the Receiver Certificate
0094  * AKE_Send_Cert and prepare AKE_Stored_Km/AKE_No_Stored_Km
0095  * @dev: device corresponding to the mei_cl_device
0096  * @data: Intel HW specific hdcp data
0097  * @rx_cert: AKE_Send_Cert for verification
0098  * @km_stored: Pairing status flag output
0099  * @ek_pub_km: AKE_Stored_Km/AKE_No_Stored_Km output msg
0100  * @msg_sz : size of AKE_XXXXX_Km output msg
0101  *
0102  * Return: 0 on Success, <0 on Failure
0103  */
0104 static int
0105 mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev,
0106                      struct hdcp_port_data *data,
0107                      struct hdcp2_ake_send_cert *rx_cert,
0108                      bool *km_stored,
0109                      struct hdcp2_ake_no_stored_km
0110                                 *ek_pub_km,
0111                      size_t *msg_sz)
0112 {
0113     struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } };
0114     struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } };
0115     struct mei_cl_device *cldev;
0116     ssize_t byte;
0117 
0118     if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
0119         return -EINVAL;
0120 
0121     cldev = to_mei_cl_device(dev);
0122 
0123     verify_rxcert_in.header.api_version = HDCP_API_VERSION;
0124     verify_rxcert_in.header.command_id = WIRED_VERIFY_RECEIVER_CERT;
0125     verify_rxcert_in.header.status = ME_HDCP_STATUS_SUCCESS;
0126     verify_rxcert_in.header.buffer_len =
0127                 WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN;
0128 
0129     verify_rxcert_in.port.integrated_port_type = data->port_type;
0130     verify_rxcert_in.port.physical_port = (u8)data->fw_ddi;
0131     verify_rxcert_in.port.attached_transcoder = (u8)data->fw_tc;
0132 
0133     verify_rxcert_in.cert_rx = rx_cert->cert_rx;
0134     memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN);
0135     memcpy(verify_rxcert_in.rx_caps, rx_cert->rx_caps, HDCP_2_2_RXCAPS_LEN);
0136 
0137     byte = mei_cldev_send(cldev, (u8 *)&verify_rxcert_in,
0138                   sizeof(verify_rxcert_in));
0139     if (byte < 0) {
0140         dev_dbg(dev, "mei_cldev_send failed: %zd\n", byte);
0141         return byte;
0142     }
0143 
0144     byte = mei_cldev_recv(cldev, (u8 *)&verify_rxcert_out,
0145                   sizeof(verify_rxcert_out));
0146     if (byte < 0) {
0147         dev_dbg(dev, "mei_cldev_recv failed: %zd\n", byte);
0148         return byte;
0149     }
0150 
0151     if (verify_rxcert_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0152         dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
0153             WIRED_VERIFY_RECEIVER_CERT,
0154             verify_rxcert_out.header.status);
0155         return -EIO;
0156     }
0157 
0158     *km_stored = !!verify_rxcert_out.km_stored;
0159     if (verify_rxcert_out.km_stored) {
0160         ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM;
0161         *msg_sz = sizeof(struct hdcp2_ake_stored_km);
0162     } else {
0163         ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM;
0164         *msg_sz = sizeof(struct hdcp2_ake_no_stored_km);
0165     }
0166 
0167     memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff,
0168            sizeof(verify_rxcert_out.ekm_buff));
0169 
0170     return 0;
0171 }
0172 
0173 /**
0174  * mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
0175  * @dev: device corresponding to the mei_cl_device
0176  * @data: Intel HW specific hdcp data
0177  * @rx_hprime: AKE_Send_H_prime msg for ME FW verification
0178  *
0179  * Return: 0 on Success, <0 on Failure
0180  */
0181 static int
0182 mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
0183                struct hdcp2_ake_send_hprime *rx_hprime)
0184 {
0185     struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
0186     struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
0187     struct mei_cl_device *cldev;
0188     ssize_t byte;
0189 
0190     if (!dev || !data || !rx_hprime)
0191         return -EINVAL;
0192 
0193     cldev = to_mei_cl_device(dev);
0194 
0195     send_hprime_in.header.api_version = HDCP_API_VERSION;
0196     send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
0197     send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
0198     send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
0199 
0200     send_hprime_in.port.integrated_port_type = data->port_type;
0201     send_hprime_in.port.physical_port = (u8)data->fw_ddi;
0202     send_hprime_in.port.attached_transcoder = (u8)data->fw_tc;
0203 
0204     memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
0205            HDCP_2_2_H_PRIME_LEN);
0206 
0207     byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
0208                   sizeof(send_hprime_in));
0209     if (byte < 0) {
0210         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0211         return byte;
0212     }
0213 
0214     byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
0215                   sizeof(send_hprime_out));
0216     if (byte < 0) {
0217         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0218         return byte;
0219     }
0220 
0221     if (send_hprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0222         dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
0223             WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status);
0224         return -EIO;
0225     }
0226 
0227     return 0;
0228 }
0229 
0230 /**
0231  * mei_hdcp_store_pairing_info() - Store pairing info received at ME FW
0232  * @dev: device corresponding to the mei_cl_device
0233  * @data: Intel HW specific hdcp data
0234  * @pairing_info: AKE_Send_Pairing_Info msg input to ME FW
0235  *
0236  * Return: 0 on Success, <0 on Failure
0237  */
0238 static int
0239 mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
0240                 struct hdcp2_ake_send_pairing_info *pairing_info)
0241 {
0242     struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
0243     struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
0244     struct mei_cl_device *cldev;
0245     ssize_t byte;
0246 
0247     if (!dev || !data || !pairing_info)
0248         return -EINVAL;
0249 
0250     cldev = to_mei_cl_device(dev);
0251 
0252     pairing_info_in.header.api_version = HDCP_API_VERSION;
0253     pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
0254     pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS;
0255     pairing_info_in.header.buffer_len =
0256                     WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;
0257 
0258     pairing_info_in.port.integrated_port_type = data->port_type;
0259     pairing_info_in.port.physical_port = (u8)data->fw_ddi;
0260     pairing_info_in.port.attached_transcoder = (u8)data->fw_tc;
0261 
0262     memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
0263            HDCP_2_2_E_KH_KM_LEN);
0264 
0265     byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
0266                   sizeof(pairing_info_in));
0267     if (byte < 0) {
0268         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0269         return byte;
0270     }
0271 
0272     byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
0273                   sizeof(pairing_info_out));
0274     if (byte < 0) {
0275         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0276         return byte;
0277     }
0278 
0279     if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0280         dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
0281             WIRED_AKE_SEND_PAIRING_INFO,
0282             pairing_info_out.header.status);
0283         return -EIO;
0284     }
0285 
0286     return 0;
0287 }
0288 
0289 /**
0290  * mei_hdcp_initiate_locality_check() - Prepare LC_Init
0291  * @dev: device corresponding to the mei_cl_device
0292  * @data: Intel HW specific hdcp data
0293  * @lc_init_data: LC_Init msg output
0294  *
0295  * Return: 0 on Success, <0 on Failure
0296  */
0297 static int
0298 mei_hdcp_initiate_locality_check(struct device *dev,
0299                  struct hdcp_port_data *data,
0300                  struct hdcp2_lc_init *lc_init_data)
0301 {
0302     struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
0303     struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
0304     struct mei_cl_device *cldev;
0305     ssize_t byte;
0306 
0307     if (!dev || !data || !lc_init_data)
0308         return -EINVAL;
0309 
0310     cldev = to_mei_cl_device(dev);
0311 
0312     lc_init_in.header.api_version = HDCP_API_VERSION;
0313     lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
0314     lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
0315     lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;
0316 
0317     lc_init_in.port.integrated_port_type = data->port_type;
0318     lc_init_in.port.physical_port = (u8)data->fw_ddi;
0319     lc_init_in.port.attached_transcoder = (u8)data->fw_tc;
0320 
0321     byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
0322     if (byte < 0) {
0323         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0324         return byte;
0325     }
0326 
0327     byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));
0328     if (byte < 0) {
0329         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0330         return byte;
0331     }
0332 
0333     if (lc_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0334         dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
0335             WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
0336         return -EIO;
0337     }
0338 
0339     lc_init_data->msg_id = HDCP_2_2_LC_INIT;
0340     memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);
0341 
0342     return 0;
0343 }
0344 
0345 /**
0346  * mei_hdcp_verify_lprime() - Verify lprime.
0347  * @dev: device corresponding to the mei_cl_device
0348  * @data: Intel HW specific hdcp data
0349  * @rx_lprime: LC_Send_L_prime msg for ME FW verification
0350  *
0351  * Return: 0 on Success, <0 on Failure
0352  */
0353 static int
0354 mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
0355                struct hdcp2_lc_send_lprime *rx_lprime)
0356 {
0357     struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } };
0358     struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } };
0359     struct mei_cl_device *cldev;
0360     ssize_t byte;
0361 
0362     if (!dev || !data || !rx_lprime)
0363         return -EINVAL;
0364 
0365     cldev = to_mei_cl_device(dev);
0366 
0367     verify_lprime_in.header.api_version = HDCP_API_VERSION;
0368     verify_lprime_in.header.command_id = WIRED_VALIDATE_LOCALITY;
0369     verify_lprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
0370     verify_lprime_in.header.buffer_len =
0371                     WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN;
0372 
0373     verify_lprime_in.port.integrated_port_type = data->port_type;
0374     verify_lprime_in.port.physical_port = (u8)data->fw_ddi;
0375     verify_lprime_in.port.attached_transcoder = (u8)data->fw_tc;
0376 
0377     memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime,
0378            HDCP_2_2_L_PRIME_LEN);
0379 
0380     byte = mei_cldev_send(cldev, (u8 *)&verify_lprime_in,
0381                   sizeof(verify_lprime_in));
0382     if (byte < 0) {
0383         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0384         return byte;
0385     }
0386 
0387     byte = mei_cldev_recv(cldev, (u8 *)&verify_lprime_out,
0388                   sizeof(verify_lprime_out));
0389     if (byte < 0) {
0390         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0391         return byte;
0392     }
0393 
0394     if (verify_lprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0395         dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
0396             WIRED_VALIDATE_LOCALITY,
0397             verify_lprime_out.header.status);
0398         return -EIO;
0399     }
0400 
0401     return 0;
0402 }
0403 
0404 /**
0405  * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks.
0406  * @dev: device corresponding to the mei_cl_device
0407  * @data: Intel HW specific hdcp data
0408  * @ske_data: SKE_Send_Eks msg output from ME FW.
0409  *
0410  * Return: 0 on Success, <0 on Failure
0411  */
0412 static int mei_hdcp_get_session_key(struct device *dev,
0413                     struct hdcp_port_data *data,
0414                     struct hdcp2_ske_send_eks *ske_data)
0415 {
0416     struct wired_cmd_get_session_key_in get_skey_in = { { 0 } };
0417     struct wired_cmd_get_session_key_out get_skey_out = { { 0 } };
0418     struct mei_cl_device *cldev;
0419     ssize_t byte;
0420 
0421     if (!dev || !data || !ske_data)
0422         return -EINVAL;
0423 
0424     cldev = to_mei_cl_device(dev);
0425 
0426     get_skey_in.header.api_version = HDCP_API_VERSION;
0427     get_skey_in.header.command_id = WIRED_GET_SESSION_KEY;
0428     get_skey_in.header.status = ME_HDCP_STATUS_SUCCESS;
0429     get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN;
0430 
0431     get_skey_in.port.integrated_port_type = data->port_type;
0432     get_skey_in.port.physical_port = (u8)data->fw_ddi;
0433     get_skey_in.port.attached_transcoder = (u8)data->fw_tc;
0434 
0435     byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in));
0436     if (byte < 0) {
0437         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0438         return byte;
0439     }
0440 
0441     byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out));
0442 
0443     if (byte < 0) {
0444         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0445         return byte;
0446     }
0447 
0448     if (get_skey_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0449         dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
0450             WIRED_GET_SESSION_KEY, get_skey_out.header.status);
0451         return -EIO;
0452     }
0453 
0454     ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS;
0455     memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks,
0456            HDCP_2_2_E_DKEY_KS_LEN);
0457     memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN);
0458 
0459     return 0;
0460 }
0461 
0462 /**
0463  * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream topology
0464  * and prepare rep_ack.
0465  * @dev: device corresponding to the mei_cl_device
0466  * @data: Intel HW specific hdcp data
0467  * @rep_topology: Receiver ID List to be validated
0468  * @rep_send_ack : repeater ack from ME FW.
0469  *
0470  * Return: 0 on Success, <0 on Failure
0471  */
0472 static int
0473 mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
0474                      struct hdcp_port_data *data,
0475                      struct hdcp2_rep_send_receiverid_list
0476                             *rep_topology,
0477                      struct hdcp2_rep_send_ack
0478                             *rep_send_ack)
0479 {
0480     struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
0481     struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
0482     struct mei_cl_device *cldev;
0483     ssize_t byte;
0484 
0485     if (!dev || !rep_topology || !rep_send_ack || !data)
0486         return -EINVAL;
0487 
0488     cldev = to_mei_cl_device(dev);
0489 
0490     verify_repeater_in.header.api_version = HDCP_API_VERSION;
0491     verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
0492     verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS;
0493     verify_repeater_in.header.buffer_len =
0494                     WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
0495 
0496     verify_repeater_in.port.integrated_port_type = data->port_type;
0497     verify_repeater_in.port.physical_port = (u8)data->fw_ddi;
0498     verify_repeater_in.port.attached_transcoder = (u8)data->fw_tc;
0499 
0500     memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
0501            HDCP_2_2_RXINFO_LEN);
0502     memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
0503            HDCP_2_2_SEQ_NUM_LEN);
0504     memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
0505            HDCP_2_2_V_PRIME_HALF_LEN);
0506     memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
0507            HDCP_2_2_RECEIVER_IDS_MAX_LEN);
0508 
0509     byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
0510                   sizeof(verify_repeater_in));
0511     if (byte < 0) {
0512         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0513         return byte;
0514     }
0515 
0516     byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
0517                   sizeof(verify_repeater_out));
0518     if (byte < 0) {
0519         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0520         return byte;
0521     }
0522 
0523     if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0524         dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
0525             WIRED_VERIFY_REPEATER,
0526             verify_repeater_out.header.status);
0527         return -EIO;
0528     }
0529 
0530     memcpy(rep_send_ack->v, verify_repeater_out.v,
0531            HDCP_2_2_V_PRIME_HALF_LEN);
0532     rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
0533 
0534     return 0;
0535 }
0536 
0537 /**
0538  * mei_hdcp_verify_mprime() - Verify mprime.
0539  * @dev: device corresponding to the mei_cl_device
0540  * @data: Intel HW specific hdcp data
0541  * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
0542  *
0543  * Return: 0 on Success, <0 on Failure
0544  */
0545 static int mei_hdcp_verify_mprime(struct device *dev,
0546                   struct hdcp_port_data *data,
0547                   struct hdcp2_rep_stream_ready *stream_ready)
0548 {
0549     struct wired_cmd_repeater_auth_stream_req_in *verify_mprime_in;
0550     struct wired_cmd_repeater_auth_stream_req_out
0551                     verify_mprime_out = { { 0 } };
0552     struct mei_cl_device *cldev;
0553     ssize_t byte;
0554     size_t cmd_size;
0555 
0556     if (!dev || !stream_ready || !data)
0557         return -EINVAL;
0558 
0559     cldev = to_mei_cl_device(dev);
0560 
0561     cmd_size = struct_size(verify_mprime_in, streams, data->k);
0562     if (cmd_size == SIZE_MAX)
0563         return -EINVAL;
0564 
0565     verify_mprime_in = kzalloc(cmd_size, GFP_KERNEL);
0566     if (!verify_mprime_in)
0567         return -ENOMEM;
0568 
0569     verify_mprime_in->header.api_version = HDCP_API_VERSION;
0570     verify_mprime_in->header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ;
0571     verify_mprime_in->header.status = ME_HDCP_STATUS_SUCCESS;
0572     verify_mprime_in->header.buffer_len = cmd_size  - sizeof(verify_mprime_in->header);
0573 
0574     verify_mprime_in->port.integrated_port_type = data->port_type;
0575     verify_mprime_in->port.physical_port = (u8)data->fw_ddi;
0576     verify_mprime_in->port.attached_transcoder = (u8)data->fw_tc;
0577 
0578     memcpy(verify_mprime_in->m_prime, stream_ready->m_prime, HDCP_2_2_MPRIME_LEN);
0579     drm_hdcp_cpu_to_be24(verify_mprime_in->seq_num_m, data->seq_num_m);
0580 
0581     memcpy(verify_mprime_in->streams, data->streams,
0582            array_size(data->k, sizeof(*data->streams)));
0583 
0584     verify_mprime_in->k = cpu_to_be16(data->k);
0585 
0586     byte = mei_cldev_send(cldev, (u8 *)verify_mprime_in, cmd_size);
0587     kfree(verify_mprime_in);
0588     if (byte < 0) {
0589         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0590         return byte;
0591     }
0592 
0593     byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out,
0594                   sizeof(verify_mprime_out));
0595     if (byte < 0) {
0596         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0597         return byte;
0598     }
0599 
0600     if (verify_mprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0601         dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
0602             WIRED_REPEATER_AUTH_STREAM_REQ,
0603             verify_mprime_out.header.status);
0604         return -EIO;
0605     }
0606 
0607     return 0;
0608 }
0609 
0610 /**
0611  * mei_hdcp_enable_authentication() - Mark a port as authenticated
0612  * through ME FW
0613  * @dev: device corresponding to the mei_cl_device
0614  * @data: Intel HW specific hdcp data
0615  *
0616  * Return: 0 on Success, <0 on Failure
0617  */
0618 static int mei_hdcp_enable_authentication(struct device *dev,
0619                       struct hdcp_port_data *data)
0620 {
0621     struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
0622     struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
0623     struct mei_cl_device *cldev;
0624     ssize_t byte;
0625 
0626     if (!dev || !data)
0627         return -EINVAL;
0628 
0629     cldev = to_mei_cl_device(dev);
0630 
0631     enable_auth_in.header.api_version = HDCP_API_VERSION;
0632     enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
0633     enable_auth_in.header.status = ME_HDCP_STATUS_SUCCESS;
0634     enable_auth_in.header.buffer_len = WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
0635 
0636     enable_auth_in.port.integrated_port_type = data->port_type;
0637     enable_auth_in.port.physical_port = (u8)data->fw_ddi;
0638     enable_auth_in.port.attached_transcoder = (u8)data->fw_tc;
0639     enable_auth_in.stream_type = data->streams[0].stream_type;
0640 
0641     byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
0642                   sizeof(enable_auth_in));
0643     if (byte < 0) {
0644         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0645         return byte;
0646     }
0647 
0648     byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
0649                   sizeof(enable_auth_out));
0650     if (byte < 0) {
0651         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0652         return byte;
0653     }
0654 
0655     if (enable_auth_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0656         dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
0657             WIRED_ENABLE_AUTH, enable_auth_out.header.status);
0658         return -EIO;
0659     }
0660 
0661     return 0;
0662 }
0663 
0664 /**
0665  * mei_hdcp_close_session() - Close the Wired HDCP Tx session of ME FW per port.
0666  * This also disables the authenticated state of the port.
0667  * @dev: device corresponding to the mei_cl_device
0668  * @data: Intel HW specific hdcp data
0669  *
0670  * Return: 0 on Success, <0 on Failure
0671  */
0672 static int
0673 mei_hdcp_close_session(struct device *dev, struct hdcp_port_data *data)
0674 {
0675     struct wired_cmd_close_session_in session_close_in = { { 0 } };
0676     struct wired_cmd_close_session_out session_close_out = { { 0 } };
0677     struct mei_cl_device *cldev;
0678     ssize_t byte;
0679 
0680     if (!dev || !data)
0681         return -EINVAL;
0682 
0683     cldev = to_mei_cl_device(dev);
0684 
0685     session_close_in.header.api_version = HDCP_API_VERSION;
0686     session_close_in.header.command_id = WIRED_CLOSE_SESSION;
0687     session_close_in.header.status = ME_HDCP_STATUS_SUCCESS;
0688     session_close_in.header.buffer_len =
0689                 WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN;
0690 
0691     session_close_in.port.integrated_port_type = data->port_type;
0692     session_close_in.port.physical_port = (u8)data->fw_ddi;
0693     session_close_in.port.attached_transcoder = (u8)data->fw_tc;
0694 
0695     byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
0696                   sizeof(session_close_in));
0697     if (byte < 0) {
0698         dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
0699         return byte;
0700     }
0701 
0702     byte = mei_cldev_recv(cldev, (u8 *)&session_close_out,
0703                   sizeof(session_close_out));
0704     if (byte < 0) {
0705         dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
0706         return byte;
0707     }
0708 
0709     if (session_close_out.header.status != ME_HDCP_STATUS_SUCCESS) {
0710         dev_dbg(dev, "Session Close Failed. status: 0x%X\n",
0711             session_close_out.header.status);
0712         return -EIO;
0713     }
0714 
0715     return 0;
0716 }
0717 
0718 static const struct i915_hdcp_component_ops mei_hdcp_ops = {
0719     .owner = THIS_MODULE,
0720     .initiate_hdcp2_session = mei_hdcp_initiate_session,
0721     .verify_receiver_cert_prepare_km =
0722                 mei_hdcp_verify_receiver_cert_prepare_km,
0723     .verify_hprime = mei_hdcp_verify_hprime,
0724     .store_pairing_info = mei_hdcp_store_pairing_info,
0725     .initiate_locality_check = mei_hdcp_initiate_locality_check,
0726     .verify_lprime = mei_hdcp_verify_lprime,
0727     .get_session_key = mei_hdcp_get_session_key,
0728     .repeater_check_flow_prepare_ack =
0729                 mei_hdcp_repeater_check_flow_prepare_ack,
0730     .verify_mprime = mei_hdcp_verify_mprime,
0731     .enable_hdcp_authentication = mei_hdcp_enable_authentication,
0732     .close_hdcp_session = mei_hdcp_close_session,
0733 };
0734 
0735 static int mei_component_master_bind(struct device *dev)
0736 {
0737     struct mei_cl_device *cldev = to_mei_cl_device(dev);
0738     struct i915_hdcp_comp_master *comp_master =
0739                         mei_cldev_get_drvdata(cldev);
0740     int ret;
0741 
0742     dev_dbg(dev, "%s\n", __func__);
0743     comp_master->ops = &mei_hdcp_ops;
0744     comp_master->mei_dev = dev;
0745     ret = component_bind_all(dev, comp_master);
0746     if (ret < 0)
0747         return ret;
0748 
0749     return 0;
0750 }
0751 
0752 static void mei_component_master_unbind(struct device *dev)
0753 {
0754     struct mei_cl_device *cldev = to_mei_cl_device(dev);
0755     struct i915_hdcp_comp_master *comp_master =
0756                         mei_cldev_get_drvdata(cldev);
0757 
0758     dev_dbg(dev, "%s\n", __func__);
0759     component_unbind_all(dev, comp_master);
0760 }
0761 
0762 static const struct component_master_ops mei_component_master_ops = {
0763     .bind = mei_component_master_bind,
0764     .unbind = mei_component_master_unbind,
0765 };
0766 
0767 /**
0768  * mei_hdcp_component_match - compare function for matching mei hdcp.
0769  *
0770  *    The function checks if the driver is i915, the subcomponent is HDCP
0771  *    and the grand parent of hdcp and the parent of i915 are the same
0772  *    PCH device.
0773  *
0774  * @dev: master device
0775  * @subcomponent: subcomponent to match (I915_COMPONENT_HDCP)
0776  * @data: compare data (mei hdcp device)
0777  *
0778  * Return:
0779  * * 1 - if components match
0780  * * 0 - otherwise
0781  */
0782 static int mei_hdcp_component_match(struct device *dev, int subcomponent,
0783                     void *data)
0784 {
0785     struct device *base = data;
0786 
0787     if (!dev->driver || strcmp(dev->driver->name, "i915") ||
0788         subcomponent != I915_COMPONENT_HDCP)
0789         return 0;
0790 
0791     base = base->parent;
0792     if (!base)
0793         return 0;
0794 
0795     base = base->parent;
0796     dev = dev->parent;
0797 
0798     return (base && dev && dev == base);
0799 }
0800 
0801 static int mei_hdcp_probe(struct mei_cl_device *cldev,
0802               const struct mei_cl_device_id *id)
0803 {
0804     struct i915_hdcp_comp_master *comp_master;
0805     struct component_match *master_match;
0806     int ret;
0807 
0808     ret = mei_cldev_enable(cldev);
0809     if (ret < 0) {
0810         dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
0811         goto enable_err_exit;
0812     }
0813 
0814     comp_master = kzalloc(sizeof(*comp_master), GFP_KERNEL);
0815     if (!comp_master) {
0816         ret = -ENOMEM;
0817         goto err_exit;
0818     }
0819 
0820     master_match = NULL;
0821     component_match_add_typed(&cldev->dev, &master_match,
0822                   mei_hdcp_component_match, &cldev->dev);
0823     if (IS_ERR_OR_NULL(master_match)) {
0824         ret = -ENOMEM;
0825         goto err_exit;
0826     }
0827 
0828     mei_cldev_set_drvdata(cldev, comp_master);
0829     ret = component_master_add_with_match(&cldev->dev,
0830                           &mei_component_master_ops,
0831                           master_match);
0832     if (ret < 0) {
0833         dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
0834         goto err_exit;
0835     }
0836 
0837     return 0;
0838 
0839 err_exit:
0840     mei_cldev_set_drvdata(cldev, NULL);
0841     kfree(comp_master);
0842     mei_cldev_disable(cldev);
0843 enable_err_exit:
0844     return ret;
0845 }
0846 
0847 static void mei_hdcp_remove(struct mei_cl_device *cldev)
0848 {
0849     struct i915_hdcp_comp_master *comp_master =
0850                         mei_cldev_get_drvdata(cldev);
0851     int ret;
0852 
0853     component_master_del(&cldev->dev, &mei_component_master_ops);
0854     kfree(comp_master);
0855     mei_cldev_set_drvdata(cldev, NULL);
0856 
0857     ret = mei_cldev_disable(cldev);
0858     if (ret)
0859         dev_warn(&cldev->dev, "mei_cldev_disable() failed\n");
0860 }
0861 
0862 #define MEI_UUID_HDCP GUID_INIT(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \
0863                 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
0864 
0865 static const struct mei_cl_device_id mei_hdcp_tbl[] = {
0866     { .uuid = MEI_UUID_HDCP, .version = MEI_CL_VERSION_ANY },
0867     { }
0868 };
0869 MODULE_DEVICE_TABLE(mei, mei_hdcp_tbl);
0870 
0871 static struct mei_cl_driver mei_hdcp_driver = {
0872     .id_table = mei_hdcp_tbl,
0873     .name = KBUILD_MODNAME,
0874     .probe = mei_hdcp_probe,
0875     .remove = mei_hdcp_remove,
0876 };
0877 
0878 module_mei_cl_driver(mei_hdcp_driver);
0879 
0880 MODULE_AUTHOR("Intel Corporation");
0881 MODULE_LICENSE("GPL");
0882 MODULE_DESCRIPTION("MEI HDCP");
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