diff options
Diffstat (limited to 'net/nfc/digital_technology.c')
| -rw-r--r-- | net/nfc/digital_technology.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c index 0c28f600fd1c..564735fbbd8f 100644 --- a/net/nfc/digital_technology.c +++ b/net/nfc/digital_technology.c @@ -475,3 +475,299 @@ int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech) return rc; } + +static int digital_tg_send_sel_res(struct nfc_digital_dev *ddev) +{ + struct sk_buff *skb; + int rc; + + skb = digital_skb_alloc(ddev, 1); + if (!skb) + return -ENOMEM; + + *skb_put(skb, 1) = DIGITAL_SEL_RES_NFC_DEP; + + if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) + digital_skb_add_crc_a(skb); + + rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_atr_req, + NULL); + if (rc) + kfree_skb(skb); + + return rc; +} + +static void digital_tg_recv_sel_req(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp) +{ + int rc; + + if (IS_ERR(resp)) { + rc = PTR_ERR(resp); + resp = NULL; + goto exit; + } + + if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) { + rc = digital_skb_check_crc_a(resp); + if (rc) { + PROTOCOL_ERR("4.4.1.3"); + goto exit; + } + } + + /* Silently ignore SEL_REQ content and send a SEL_RES for NFC-DEP */ + + rc = digital_tg_send_sel_res(ddev); + +exit: + if (rc) + digital_poll_next_tech(ddev); + + dev_kfree_skb(resp); +} + +static int digital_tg_send_sdd_res(struct nfc_digital_dev *ddev) +{ + struct sk_buff *skb; + struct digital_sdd_res *sdd_res; + int rc, i; + + skb = digital_skb_alloc(ddev, sizeof(struct digital_sdd_res)); + if (!skb) + return -ENOMEM; + + skb_put(skb, sizeof(struct digital_sdd_res)); + sdd_res = (struct digital_sdd_res *)skb->data; + + sdd_res->nfcid1[0] = 0x08; + get_random_bytes(sdd_res->nfcid1 + 1, 3); + + sdd_res->bcc = 0; + for (i = 0; i < 4; i++) + sdd_res->bcc ^= sdd_res->nfcid1[i]; + + rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sel_req, + NULL); + if (rc) + kfree_skb(skb); + + return rc; +} + +static void digital_tg_recv_sdd_req(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp) +{ + u8 *sdd_req; + int rc; + + if (IS_ERR(resp)) { + rc = PTR_ERR(resp); + resp = NULL; + goto exit; + } + + sdd_req = resp->data; + + if (resp->len < 2 || sdd_req[0] != DIGITAL_CMD_SEL_REQ_CL1 || + sdd_req[1] != DIGITAL_SDD_REQ_SEL_PAR) { + rc = -EINVAL; + goto exit; + } + + rc = digital_tg_send_sdd_res(ddev); + +exit: + if (rc) + digital_poll_next_tech(ddev); + + dev_kfree_skb(resp); +} + +static int digital_tg_send_sens_res(struct nfc_digital_dev *ddev) +{ + struct sk_buff *skb; + u8 *sens_res; + int rc; + + skb = digital_skb_alloc(ddev, 2); + if (!skb) + return -ENOMEM; + + sens_res = skb_put(skb, 2); + + sens_res[0] = (DIGITAL_SENS_RES_NFC_DEP >> 8) & 0xFF; + sens_res[1] = DIGITAL_SENS_RES_NFC_DEP & 0xFF; + + rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sdd_req, + NULL); + if (rc) + kfree_skb(skb); + + return rc; +} + +void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp) +{ + u8 sens_req; + int rc; + + if (IS_ERR(resp)) { + rc = PTR_ERR(resp); + resp = NULL; + goto exit; + } + + sens_req = resp->data[0]; + + if (!resp->len || (sens_req != DIGITAL_CMD_SENS_REQ && + sens_req != DIGITAL_CMD_ALL_REQ)) { + rc = -EINVAL; + goto exit; + } + + rc = digital_tg_send_sens_res(ddev); + +exit: + if (rc) + digital_poll_next_tech(ddev); + + dev_kfree_skb(resp); +} + +int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev, + struct digital_sensf_req *sensf_req) +{ + struct sk_buff *skb; + u8 size; + int rc; + struct digital_sensf_res *sensf_res; + + size = sizeof(struct digital_sensf_res); + + if (sensf_req->rc != DIGITAL_SENSF_REQ_RC_NONE) + size -= sizeof(sensf_res->rd); + + skb = digital_skb_alloc(ddev, size); + if (!skb) + return -ENOMEM; + + skb_put(skb, size); + + sensf_res = (struct digital_sensf_res *)skb->data; + + memset(sensf_res, 0, size); + + sensf_res->cmd = DIGITAL_CMD_SENSF_RES; + sensf_res->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; + sensf_res->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; + get_random_bytes(&sensf_res->nfcid2[2], 6); + + switch (sensf_req->rc) { + case DIGITAL_SENSF_REQ_RC_SC: + sensf_res->rd[0] = sensf_req->sc1; + sensf_res->rd[1] = sensf_req->sc2; + break; + case DIGITAL_SENSF_REQ_RC_AP: + sensf_res->rd[0] = DIGITAL_SENSF_RES_RD_AP_B1; + sensf_res->rd[1] = DIGITAL_SENSF_RES_RD_AP_B2; + break; + } + + *skb_push(skb, sizeof(u8)) = size + 1; + + if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) + digital_skb_add_crc_f(skb); + + rc = digital_tg_send_cmd(ddev, skb, 300, + digital_tg_recv_atr_req, NULL); + if (rc) + kfree_skb(skb); + + return rc; +} + +void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg, + struct sk_buff *resp) +{ + struct digital_sensf_req *sensf_req; + int rc; + + if (IS_ERR(resp)) { + rc = PTR_ERR(resp); + resp = NULL; + goto exit; + } + + if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) { + rc = digital_skb_check_crc_f(resp); + if (rc) { + PROTOCOL_ERR("6.4.1.8"); + goto exit; + } + } + + if (resp->len != sizeof(struct digital_sensf_req) + 1) { + rc = -EINVAL; + goto exit; + } + + skb_pull(resp, 1); + sensf_req = (struct digital_sensf_req *)resp->data; + + if (sensf_req->cmd != DIGITAL_CMD_SENSF_REQ) { + rc = -EINVAL; + goto exit; + } + + rc = digital_tg_send_sensf_res(ddev, sensf_req); + +exit: + if (rc) + digital_poll_next_tech(ddev); + + dev_kfree_skb(resp); +} + +int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech) +{ + int rc; + + rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); + if (rc) + return rc; + + rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, + NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); + if (rc) + return rc; + + return digital_tg_listen(ddev, 300, digital_tg_recv_sens_req, NULL); +} + +int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech) +{ + int rc; + u8 *nfcid2; + + rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); + if (rc) + return rc; + + rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, + NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); + if (rc) + return rc; + + nfcid2 = kzalloc(NFC_NFCID2_MAXSIZE, GFP_KERNEL); + if (!nfcid2) + return -ENOMEM; + + nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; + nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; + get_random_bytes(nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); + + return digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, nfcid2); +} |