| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * NFC Digital Protocol stack |
| * Copyright (c) 2013, Intel Corporation. |
| */ |
| |
| #define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
| |
| #include "digital.h" |
| |
| #define DIGITAL_NFC_DEP_N_RETRY_NACK 2 |
| #define DIGITAL_NFC_DEP_N_RETRY_ATN 2 |
| |
| #define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4 |
| #define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5 |
| |
| #define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0 |
| |
| #define DIGITAL_CMD_ATR_REQ 0x00 |
| #define DIGITAL_CMD_ATR_RES 0x01 |
| #define DIGITAL_CMD_PSL_REQ 0x04 |
| #define DIGITAL_CMD_PSL_RES 0x05 |
| #define DIGITAL_CMD_DEP_REQ 0x06 |
| #define DIGITAL_CMD_DEP_RES 0x07 |
| |
| #define DIGITAL_ATR_REQ_MIN_SIZE 16 |
| #define DIGITAL_ATR_REQ_MAX_SIZE 64 |
| |
| #define DIGITAL_ATR_RES_TO_WT(s) ((s) & 0xF) |
| |
| #define DIGITAL_DID_MAX 14 |
| |
| #define DIGITAL_PAYLOAD_SIZE_MAX 254 |
| #define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4) |
| #define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3) |
| #define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3) |
| #define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3) |
| |
| #define DIGITAL_GB_BIT 0x02 |
| |
| #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) |
| |
| #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 |
| #define DIGITAL_NFC_DEP_PFB_MI_BIT 0x10 |
| #define DIGITAL_NFC_DEP_PFB_NACK_BIT 0x10 |
| #define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04 |
| |
| #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ |
| ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) |
| #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_MI_BIT) |
| #define DIGITAL_NFC_DEP_NACK_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_NACK_BIT) |
| #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) |
| #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT) |
| #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) |
| |
| #define DIGITAL_NFC_DEP_RTOX_VALUE(data) ((data) & 0x3F) |
| #define DIGITAL_NFC_DEP_RTOX_MAX 59 |
| |
| #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 |
| #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 |
| #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 |
| |
| struct digital_atr_req { |
| u8 dir; |
| u8 cmd; |
| u8 nfcid3[10]; |
| u8 did; |
| u8 bs; |
| u8 br; |
| u8 pp; |
| u8 gb[]; |
| } __packed; |
| |
| struct digital_atr_res { |
| u8 dir; |
| u8 cmd; |
| u8 nfcid3[10]; |
| u8 did; |
| u8 bs; |
| u8 br; |
| u8 to; |
| u8 pp; |
| u8 gb[]; |
| } __packed; |
| |
| struct digital_psl_req { |
| u8 dir; |
| u8 cmd; |
| u8 did; |
| u8 brs; |
| u8 fsl; |
| } __packed; |
| |
| struct digital_psl_res { |
| u8 dir; |
| u8 cmd; |
| u8 did; |
| } __packed; |
| |
| struct digital_dep_req_res { |
| u8 dir; |
| u8 cmd; |
| u8 pfb; |
| } __packed; |
| |
| static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, |
| struct sk_buff *resp); |
| static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
| struct sk_buff *resp); |
| |
| static const u8 digital_payload_bits_map[4] = { |
| [0] = 64, |
| [1] = 128, |
| [2] = 192, |
| [3] = 254 |
| }; |
| |
| /* Response Waiting Time for ATR_RES PDU in ms |
| * |
| * RWT(ATR_RES) = RWT(nfcdep,activation) + dRWT(nfcdep) + dT(nfcdep,initiator) |
| * |
| * with: |
| * RWT(nfcdep,activation) = 4096 * 2^12 / f(c) s |
| * dRWT(nfcdep) = 16 / f(c) s |
| * dT(nfcdep,initiator) = 100 ms |
| * f(c) = 13560000 Hz |
| */ |
| #define DIGITAL_ATR_RES_RWT 1337 |
| |
| /* Response Waiting Time for other DEP PDUs in ms |
| * |
| * max_rwt = rwt + dRWT(nfcdep) + dT(nfcdep,initiator) |
| * |
| * with: |
| * rwt = (256 * 16 / f(c)) * 2^wt s |
| * dRWT(nfcdep) = 16 / f(c) s |
| * dT(nfcdep,initiator) = 100 ms |
| * f(c) = 13560000 Hz |
| * 0 <= wt <= 14 (given by the target by the TO field of ATR_RES response) |
| */ |
| #define DIGITAL_NFC_DEP_IN_MAX_WT 14 |
| #define DIGITAL_NFC_DEP_TG_MAX_WT 14 |
| static const u16 digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT + 1] = { |
| 100, 101, 101, 102, 105, |
| 110, 119, 139, 177, 255, |
| 409, 719, 1337, 2575, 5049, |
| }; |
| |
| static u8 digital_payload_bits_to_size(u8 payload_bits) |
| { |
| if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map)) |
| return 0; |
| |
| return digital_payload_bits_map[payload_bits]; |
| } |
| |
| static u8 digital_payload_size_to_bits(u8 payload_size) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++) |
| if (digital_payload_bits_map[i] == payload_size) |
| return i; |
| |
| return 0xff; |
| } |
| |
| static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, |
| struct sk_buff *skb) |
| { |
| skb_push(skb, sizeof(u8)); |
| |
| skb->data[0] = skb->len; |
| |
| if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) |
| *(u8 *)skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; |
| } |
| |
| static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, |
| struct sk_buff *skb) |
| { |
| u8 size; |
| |
| if (skb->len < 2) |
| return -EIO; |
| |
| if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) |
| skb_pull(skb, sizeof(u8)); |
| |
| size = skb->data[0]; |
| if (size != skb->len) |
| return -EIO; |
| |
| skb_pull(skb, sizeof(u8)); |
| |
| return 0; |
| } |
| |
| static struct sk_buff * |
| digital_send_dep_data_prep(struct nfc_digital_dev *ddev, struct sk_buff *skb, |
| struct digital_dep_req_res *dep_req_res, |
| struct digital_data_exch *data_exch) |
| { |
| struct sk_buff *new_skb; |
| |
| if (skb->len > ddev->remote_payload_max) { |
| dep_req_res->pfb |= DIGITAL_NFC_DEP_PFB_MI_BIT; |
| |
| new_skb = digital_skb_alloc(ddev, ddev->remote_payload_max); |
| if (!new_skb) { |
| kfree_skb(ddev->chaining_skb); |
| ddev->chaining_skb = NULL; |
| |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| skb_put_data(new_skb, skb->data, ddev->remote_payload_max); |
| skb_pull(skb, ddev->remote_payload_max); |
| |
| ddev->chaining_skb = skb; |
| ddev->data_exch = data_exch; |
| } else { |
| ddev->chaining_skb = NULL; |
| new_skb = skb; |
| } |
| |
| return new_skb; |
| } |
| |
| static struct sk_buff * |
| digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb, |
| struct sk_buff *resp, |
| int (*send_ack)(struct nfc_digital_dev *ddev, |
| struct digital_data_exch |
| *data_exch), |
| struct digital_data_exch *data_exch) |
| { |
| struct sk_buff *new_skb; |
| int rc; |
| |
| if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) { |
| ddev->chaining_skb = |
| nfc_alloc_recv_skb(8 * ddev->local_payload_max, |
| GFP_KERNEL); |
| if (!ddev->chaining_skb) { |
| rc = -ENOMEM; |
| goto error; |
| } |
| } |
| |
| if (ddev->chaining_skb) { |
| if (resp->len > skb_tailroom(ddev->chaining_skb)) { |
| new_skb = skb_copy_expand(ddev->chaining_skb, |
| skb_headroom( |
| ddev->chaining_skb), |
| 8 * ddev->local_payload_max, |
| GFP_KERNEL); |
| if (!new_skb) { |
| rc = -ENOMEM; |
| goto error; |
| } |
| |
| kfree_skb(ddev->chaining_skb); |
| ddev->chaining_skb = new_skb; |
| } |
| |
| skb_put_data(ddev->chaining_skb, resp->data, resp->len); |
| |
| kfree_skb(resp); |
| resp = NULL; |
| |
| if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { |
| rc = send_ack(ddev, data_exch); |
| if (rc) |
| goto error; |
| |
| return NULL; |
| } |
| |
| resp = ddev->chaining_skb; |
| ddev->chaining_skb = NULL; |
| } |
| |
| return resp; |
| |
| error: |
| kfree_skb(resp); |
| |
| kfree_skb(ddev->chaining_skb); |
| ddev->chaining_skb = NULL; |
| |
| return ERR_PTR(rc); |
| } |
| |
| static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg, |
| struct sk_buff *resp) |
| { |
| struct nfc_target *target = arg; |
| struct digital_psl_res *psl_res; |
| int rc; |
| |
| if (IS_ERR(resp)) { |
| rc = PTR_ERR(resp); |
| resp = NULL; |
| goto exit; |
| } |
| |
| rc = ddev->skb_check_crc(resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.6"); |
| goto exit; |
| } |
| |
| rc = digital_skb_pull_dep_sod(ddev, resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.2"); |
| goto exit; |
| } |
| |
| psl_res = (struct digital_psl_res *)resp->data; |
| |
| if ((resp->len != sizeof(*psl_res)) || |
| (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) || |
| (psl_res->cmd != DIGITAL_CMD_PSL_RES)) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, |
| NFC_DIGITAL_RF_TECH_424F); |
| if (rc) |
| goto exit; |
| |
| rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
| NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); |
| if (rc) |
| goto exit; |
| |
| if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) && |
| (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) { |
| ddev->skb_add_crc = digital_skb_add_crc_f; |
| ddev->skb_check_crc = digital_skb_check_crc_f; |
| } |
| |
| ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F; |
| |
| nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
| NFC_RF_INITIATOR); |
| |
| ddev->curr_nfc_dep_pni = 0; |
| |
| exit: |
| dev_kfree_skb(resp); |
| |
| if (rc) |
| ddev->curr_protocol = 0; |
| } |
| |
| static int digital_in_send_psl_req(struct nfc_digital_dev *ddev, |
| struct nfc_target *target) |
| { |
| struct sk_buff *skb; |
| struct digital_psl_req *psl_req; |
| int rc; |
| u8 payload_size, payload_bits; |
| |
| skb = digital_skb_alloc(ddev, sizeof(*psl_req)); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_put(skb, sizeof(*psl_req)); |
| |
| psl_req = (struct digital_psl_req *)skb->data; |
| |
| psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| psl_req->cmd = DIGITAL_CMD_PSL_REQ; |
| psl_req->did = 0; |
| psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */ |
| |
| payload_size = min(ddev->local_payload_max, ddev->remote_payload_max); |
| payload_bits = digital_payload_size_to_bits(payload_size); |
| psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits); |
| |
| ddev->local_payload_max = payload_size; |
| ddev->remote_payload_max = payload_size; |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
| digital_in_recv_psl_res, target); |
| if (rc) |
| kfree_skb(skb); |
| |
| return rc; |
| } |
| |
| static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, |
| struct sk_buff *resp) |
| { |
| struct nfc_target *target = arg; |
| struct digital_atr_res *atr_res; |
| u8 gb_len, payload_bits; |
| u8 wt; |
| int rc; |
| |
| if (IS_ERR(resp)) { |
| rc = PTR_ERR(resp); |
| resp = NULL; |
| goto exit; |
| } |
| |
| rc = ddev->skb_check_crc(resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.6"); |
| goto exit; |
| } |
| |
| rc = digital_skb_pull_dep_sod(ddev, resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.2"); |
| goto exit; |
| } |
| |
| if (resp->len < sizeof(struct digital_atr_res)) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| gb_len = resp->len - sizeof(struct digital_atr_res); |
| |
| atr_res = (struct digital_atr_res *)resp->data; |
| |
| wt = DIGITAL_ATR_RES_TO_WT(atr_res->to); |
| if (wt > DIGITAL_NFC_DEP_IN_MAX_WT) |
| wt = DIGITAL_NFC_DEP_IN_MAX_WT; |
| ddev->dep_rwt = digital_rwt_map[wt]; |
| |
| payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp); |
| ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); |
| |
| if (!ddev->remote_payload_max) { |
| rc = -EINVAL; |
| goto exit; |
| } |
| |
| rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); |
| if (rc) |
| goto exit; |
| |
| if ((ddev->protocols & NFC_PROTO_FELICA_MASK) && |
| (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) { |
| rc = digital_in_send_psl_req(ddev, target); |
| if (!rc) |
| goto exit; |
| } |
| |
| rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
| NFC_RF_INITIATOR); |
| |
| ddev->curr_nfc_dep_pni = 0; |
| |
| exit: |
| dev_kfree_skb(resp); |
| |
| if (rc) |
| ddev->curr_protocol = 0; |
| } |
| |
| int digital_in_send_atr_req(struct nfc_digital_dev *ddev, |
| struct nfc_target *target, __u8 comm_mode, __u8 *gb, |
| size_t gb_len) |
| { |
| struct sk_buff *skb; |
| struct digital_atr_req *atr_req; |
| uint size; |
| int rc; |
| u8 payload_bits; |
| |
| size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; |
| |
| if (size > DIGITAL_ATR_REQ_MAX_SIZE) { |
| PROTOCOL_ERR("14.6.1.1"); |
| return -EINVAL; |
| } |
| |
| skb = digital_skb_alloc(ddev, size); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_put(skb, sizeof(struct digital_atr_req)); |
| |
| atr_req = (struct digital_atr_req *)skb->data; |
| memset(atr_req, 0, sizeof(struct digital_atr_req)); |
| |
| atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| atr_req->cmd = DIGITAL_CMD_ATR_REQ; |
| if (target->nfcid2_len) |
| memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
| else |
| get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
| |
| atr_req->did = 0; |
| atr_req->bs = 0; |
| atr_req->br = 0; |
| |
| ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
| payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); |
| atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); |
| |
| if (gb_len) { |
| atr_req->pp |= DIGITAL_GB_BIT; |
| skb_put_data(skb, gb, gb_len); |
| } |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| rc = digital_in_send_cmd(ddev, skb, DIGITAL_ATR_RES_RWT, |
| digital_in_recv_atr_res, target); |
| if (rc) |
| kfree_skb(skb); |
| |
| return rc; |
| } |
| |
| static int digital_in_send_ack(struct nfc_digital_dev *ddev, |
| struct digital_data_exch *data_exch) |
| { |
| struct digital_dep_req_res *dep_req; |
| struct sk_buff *skb; |
| int rc; |
| |
| skb = digital_skb_alloc(ddev, 1); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_push(skb, sizeof(struct digital_dep_req_res)); |
| |
| dep_req = (struct digital_dep_req_res *)skb->data; |
| |
| dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | |
| ddev->curr_nfc_dep_pni; |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| ddev->saved_skb = pskb_copy(skb, GFP_KERNEL); |
| |
| rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
| digital_in_recv_dep_res, data_exch); |
| if (rc) { |
| kfree_skb(skb); |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| } |
| |
| return rc; |
| } |
| |
| static int digital_in_send_nack(struct nfc_digital_dev *ddev, |
| struct digital_data_exch *data_exch) |
| { |
| struct digital_dep_req_res *dep_req; |
| struct sk_buff *skb; |
| int rc; |
| |
| skb = digital_skb_alloc(ddev, 1); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_push(skb, sizeof(struct digital_dep_req_res)); |
| |
| dep_req = (struct digital_dep_req_res *)skb->data; |
| |
| dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | |
| DIGITAL_NFC_DEP_PFB_NACK_BIT | ddev->curr_nfc_dep_pni; |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
| digital_in_recv_dep_res, data_exch); |
| if (rc) |
| kfree_skb(skb); |
| |
| return rc; |
| } |
| |
| static int digital_in_send_atn(struct nfc_digital_dev *ddev, |
| struct digital_data_exch *data_exch) |
| { |
| struct digital_dep_req_res *dep_req; |
| struct sk_buff *skb; |
| int rc; |
| |
| skb = digital_skb_alloc(ddev, 1); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_push(skb, sizeof(struct digital_dep_req_res)); |
| |
| dep_req = (struct digital_dep_req_res *)skb->data; |
| |
| dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
| digital_in_recv_dep_res, data_exch); |
| if (rc) |
| kfree_skb(skb); |
| |
| return rc; |
| } |
| |
| static int digital_in_send_rtox(struct nfc_digital_dev *ddev, |
| struct digital_data_exch *data_exch, u8 rtox) |
| { |
| struct digital_dep_req_res *dep_req; |
| struct sk_buff *skb; |
| int rc; |
| u16 rwt_int; |
| |
| rwt_int = ddev->dep_rwt * rtox; |
| if (rwt_int > digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT]) |
| rwt_int = digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT]; |
| |
| skb = digital_skb_alloc(ddev, 1); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_put_u8(skb, rtox); |
| |
| skb_push(skb, sizeof(struct digital_dep_req_res)); |
| |
| dep_req = (struct digital_dep_req_res *)skb->data; |
| |
| dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | |
| DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| rc = digital_in_send_cmd(ddev, skb, rwt_int, |
| digital_in_recv_dep_res, data_exch); |
| if (rc) |
| kfree_skb(skb); |
| |
| return rc; |
| } |
| |
| static int digital_in_send_saved_skb(struct nfc_digital_dev *ddev, |
| struct digital_data_exch *data_exch) |
| { |
| int rc; |
| |
| if (!ddev->saved_skb) |
| return -EINVAL; |
| |
| skb_get(ddev->saved_skb); |
| |
| rc = digital_in_send_cmd(ddev, ddev->saved_skb, ddev->dep_rwt, |
| digital_in_recv_dep_res, data_exch); |
| if (rc) |
| kfree_skb(ddev->saved_skb); |
| |
| return rc; |
| } |
| |
| static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, |
| struct sk_buff *resp) |
| { |
| struct digital_data_exch *data_exch = arg; |
| struct digital_dep_req_res *dep_res; |
| u8 pfb; |
| uint size; |
| int rc; |
| u8 rtox; |
| |
| if (IS_ERR(resp)) { |
| rc = PTR_ERR(resp); |
| resp = NULL; |
| |
| if ((rc == -EIO || (rc == -ETIMEDOUT && ddev->nack_count)) && |
| (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { |
| ddev->atn_count = 0; |
| |
| rc = digital_in_send_nack(ddev, data_exch); |
| if (rc) |
| goto error; |
| |
| return; |
| } else if ((rc == -ETIMEDOUT) && |
| (ddev->atn_count++ < DIGITAL_NFC_DEP_N_RETRY_ATN)) { |
| ddev->nack_count = 0; |
| |
| rc = digital_in_send_atn(ddev, data_exch); |
| if (rc) |
| goto error; |
| |
| return; |
| } |
| |
| goto exit; |
| } |
| |
| rc = digital_skb_pull_dep_sod(ddev, resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.2"); |
| goto exit; |
| } |
| |
| rc = ddev->skb_check_crc(resp); |
| if (rc) { |
| if ((resp->len >= 4) && |
| (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { |
| ddev->atn_count = 0; |
| |
| rc = digital_in_send_nack(ddev, data_exch); |
| if (rc) |
| goto error; |
| |
| kfree_skb(resp); |
| |
| return; |
| } |
| |
| PROTOCOL_ERR("14.4.1.6"); |
| goto error; |
| } |
| |
| ddev->atn_count = 0; |
| ddev->nack_count = 0; |
| |
| if (resp->len > ddev->local_payload_max) { |
| rc = -EMSGSIZE; |
| goto exit; |
| } |
| |
| size = sizeof(struct digital_dep_req_res); |
| dep_res = (struct digital_dep_req_res *)resp->data; |
| |
| if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || |
| dep_res->cmd != DIGITAL_CMD_DEP_RES) { |
| rc = -EIO; |
| goto error; |
| } |
| |
| pfb = dep_res->pfb; |
| |
| if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
| PROTOCOL_ERR("14.8.2.1"); |
| rc = -EIO; |
| goto error; |
| } |
| |
| if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| if (size > resp->len) { |
| rc = -EIO; |
| goto error; |
| } |
| |
| skb_pull(resp, size); |
| |
| switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
| case DIGITAL_NFC_DEP_PFB_I_PDU: |
| if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
| PROTOCOL_ERR("14.12.3.3"); |
| rc = -EIO; |
| goto error; |
| } |
| |
| ddev->curr_nfc_dep_pni = |
| DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); |
| |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| |
| resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
| digital_in_send_ack, |
| data_exch); |
| if (IS_ERR(resp)) { |
| rc = PTR_ERR(resp); |
| resp = NULL; |
| goto error; |
| } |
| |
| /* If resp is NULL then we're still chaining so return and |
| * wait for the next part of the PDU. Else, the PDU is |
| * complete so pass it up. |
| */ |
| if (!resp) |
| return; |
| |
| rc = 0; |
| break; |
| |
| case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: |
| if (DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { |
| PROTOCOL_ERR("14.12.4.5"); |
| rc = -EIO; |
| goto exit; |
| } |
| |
| if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
| PROTOCOL_ERR("14.12.3.3"); |
| rc = -EIO; |
| goto exit; |
| } |
| |
| ddev->curr_nfc_dep_pni = |
| DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); |
| |
| if (!ddev->chaining_skb) { |
| PROTOCOL_ERR("14.12.4.3"); |
| rc = -EIO; |
| goto exit; |
| } |
| |
| /* The initiator has received a valid ACK. Free the last sent |
| * PDU and keep on sending chained skb. |
| */ |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| |
| rc = digital_in_send_dep_req(ddev, NULL, |
| ddev->chaining_skb, |
| ddev->data_exch); |
| if (rc) |
| goto error; |
| |
| goto free_resp; |
| |
| case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
| if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { /* ATN */ |
| rc = digital_in_send_saved_skb(ddev, data_exch); |
| if (rc) |
| goto error; |
| |
| goto free_resp; |
| } |
| |
| if (ddev->atn_count || ddev->nack_count) { |
| PROTOCOL_ERR("14.12.4.4"); |
| rc = -EIO; |
| goto error; |
| } |
| |
| rtox = DIGITAL_NFC_DEP_RTOX_VALUE(resp->data[0]); |
| if (!rtox || rtox > DIGITAL_NFC_DEP_RTOX_MAX) { |
| PROTOCOL_ERR("14.8.4.1"); |
| rc = -EIO; |
| goto error; |
| } |
| |
| rc = digital_in_send_rtox(ddev, data_exch, rtox); |
| if (rc) |
| goto error; |
| |
| goto free_resp; |
| } |
| |
| exit: |
| data_exch->cb(data_exch->cb_context, resp, rc); |
| |
| error: |
| kfree(data_exch); |
| |
| kfree_skb(ddev->chaining_skb); |
| ddev->chaining_skb = NULL; |
| |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| |
| if (rc) |
| kfree_skb(resp); |
| |
| return; |
| |
| free_resp: |
| dev_kfree_skb(resp); |
| } |
| |
| int digital_in_send_dep_req(struct nfc_digital_dev *ddev, |
| struct nfc_target *target, struct sk_buff *skb, |
| struct digital_data_exch *data_exch) |
| { |
| struct digital_dep_req_res *dep_req; |
| struct sk_buff *chaining_skb, *tmp_skb; |
| int rc; |
| |
| skb_push(skb, sizeof(struct digital_dep_req_res)); |
| |
| dep_req = (struct digital_dep_req_res *)skb->data; |
| |
| dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| dep_req->pfb = ddev->curr_nfc_dep_pni; |
| |
| ddev->atn_count = 0; |
| ddev->nack_count = 0; |
| |
| chaining_skb = ddev->chaining_skb; |
| |
| tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_req, data_exch); |
| if (IS_ERR(tmp_skb)) |
| return PTR_ERR(tmp_skb); |
| |
| digital_skb_push_dep_sod(ddev, tmp_skb); |
| |
| ddev->skb_add_crc(tmp_skb); |
| |
| ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL); |
| |
| rc = digital_in_send_cmd(ddev, tmp_skb, ddev->dep_rwt, |
| digital_in_recv_dep_res, data_exch); |
| if (rc) { |
| if (tmp_skb != skb) |
| kfree_skb(tmp_skb); |
| |
| kfree_skb(chaining_skb); |
| ddev->chaining_skb = NULL; |
| |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| } |
| |
| return rc; |
| } |
| |
| static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech) |
| { |
| ddev->curr_rf_tech = rf_tech; |
| |
| ddev->skb_add_crc = digital_skb_add_crc_none; |
| ddev->skb_check_crc = digital_skb_check_crc_none; |
| |
| if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) |
| return; |
| |
| switch (ddev->curr_rf_tech) { |
| case NFC_DIGITAL_RF_TECH_106A: |
| ddev->skb_add_crc = digital_skb_add_crc_a; |
| ddev->skb_check_crc = digital_skb_check_crc_a; |
| break; |
| |
| case NFC_DIGITAL_RF_TECH_212F: |
| case NFC_DIGITAL_RF_TECH_424F: |
| ddev->skb_add_crc = digital_skb_add_crc_f; |
| ddev->skb_check_crc = digital_skb_check_crc_f; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| static int digital_tg_send_ack(struct nfc_digital_dev *ddev, |
| struct digital_data_exch *data_exch) |
| { |
| struct digital_dep_req_res *dep_res; |
| struct sk_buff *skb; |
| int rc; |
| |
| skb = digital_skb_alloc(ddev, 1); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_push(skb, sizeof(struct digital_dep_req_res)); |
| |
| dep_res = (struct digital_dep_req_res *)skb->data; |
| |
| dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| dep_res->cmd = DIGITAL_CMD_DEP_RES; |
| dep_res->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | |
| ddev->curr_nfc_dep_pni; |
| |
| if (ddev->did) { |
| dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; |
| |
| skb_put_data(skb, &ddev->did, sizeof(ddev->did)); |
| } |
| |
| ddev->curr_nfc_dep_pni = |
| DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| ddev->saved_skb = pskb_copy(skb, GFP_KERNEL); |
| |
| rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, |
| data_exch); |
| if (rc) { |
| kfree_skb(skb); |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| } |
| |
| return rc; |
| } |
| |
| static int digital_tg_send_atn(struct nfc_digital_dev *ddev) |
| { |
| struct digital_dep_req_res *dep_res; |
| struct sk_buff *skb; |
| int rc; |
| |
| skb = digital_skb_alloc(ddev, 1); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_push(skb, sizeof(struct digital_dep_req_res)); |
| |
| dep_res = (struct digital_dep_req_res *)skb->data; |
| |
| dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| dep_res->cmd = DIGITAL_CMD_DEP_RES; |
| dep_res->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; |
| |
| if (ddev->did) { |
| dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; |
| |
| skb_put_data(skb, &ddev->did, sizeof(ddev->did)); |
| } |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, |
| NULL); |
| if (rc) |
| kfree_skb(skb); |
| |
| return rc; |
| } |
| |
| static int digital_tg_send_saved_skb(struct nfc_digital_dev *ddev) |
| { |
| int rc; |
| |
| if (!ddev->saved_skb) |
| return -EINVAL; |
| |
| skb_get(ddev->saved_skb); |
| |
| rc = digital_tg_send_cmd(ddev, ddev->saved_skb, 1500, |
| digital_tg_recv_dep_req, NULL); |
| if (rc) |
| kfree_skb(ddev->saved_skb); |
| |
| return rc; |
| } |
| |
| static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
| struct sk_buff *resp) |
| { |
| int rc; |
| struct digital_dep_req_res *dep_req; |
| u8 pfb; |
| size_t size; |
| |
| if (IS_ERR(resp)) { |
| rc = PTR_ERR(resp); |
| resp = NULL; |
| goto exit; |
| } |
| |
| rc = ddev->skb_check_crc(resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.6"); |
| goto exit; |
| } |
| |
| rc = digital_skb_pull_dep_sod(ddev, resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.2"); |
| goto exit; |
| } |
| |
| if (resp->len > ddev->local_payload_max) { |
| rc = -EMSGSIZE; |
| goto exit; |
| } |
| |
| size = sizeof(struct digital_dep_req_res); |
| dep_req = (struct digital_dep_req_res *)resp->data; |
| |
| if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || |
| dep_req->cmd != DIGITAL_CMD_DEP_REQ) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| pfb = dep_req->pfb; |
| |
| if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
| if (ddev->did && (ddev->did == resp->data[3])) { |
| size++; |
| } else { |
| rc = -EIO; |
| goto exit; |
| } |
| } else if (ddev->did) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| if (size > resp->len) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| skb_pull(resp, size); |
| |
| switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
| case DIGITAL_NFC_DEP_PFB_I_PDU: |
| pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); |
| |
| if (ddev->atn_count) { |
| /* The target has received (and replied to) at least one |
| * ATN DEP_REQ. |
| */ |
| ddev->atn_count = 0; |
| |
| /* pni of resp PDU equal to the target current pni - 1 |
| * means resp is the previous DEP_REQ PDU received from |
| * the initiator so the target replies with saved_skb |
| * which is the previous DEP_RES saved in |
| * digital_tg_send_dep_res(). |
| */ |
| if (DIGITAL_NFC_DEP_PFB_PNI(pfb) == |
| DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni - 1)) { |
| rc = digital_tg_send_saved_skb(ddev); |
| if (rc) |
| goto exit; |
| |
| goto free_resp; |
| } |
| |
| /* atn_count > 0 and PDU pni != curr_nfc_dep_pni - 1 |
| * means the target probably did not received the last |
| * DEP_REQ PDU sent by the initiator. The target |
| * fallbacks to normal processing then. |
| */ |
| } |
| |
| if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
| PROTOCOL_ERR("14.12.3.4"); |
| rc = -EIO; |
| goto exit; |
| } |
| |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| |
| resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
| digital_tg_send_ack, NULL); |
| if (IS_ERR(resp)) { |
| rc = PTR_ERR(resp); |
| resp = NULL; |
| goto exit; |
| } |
| |
| /* If resp is NULL then we're still chaining so return and |
| * wait for the next part of the PDU. Else, the PDU is |
| * complete so pass it up. |
| */ |
| if (!resp) |
| return; |
| |
| rc = 0; |
| break; |
| case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: |
| if (DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { /* NACK */ |
| if (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) != |
| ddev->curr_nfc_dep_pni) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| ddev->atn_count = 0; |
| |
| rc = digital_tg_send_saved_skb(ddev); |
| if (rc) |
| goto exit; |
| |
| goto free_resp; |
| } |
| |
| /* ACK */ |
| if (ddev->atn_count) { |
| /* The target has previously received one or more ATN |
| * PDUs. |
| */ |
| ddev->atn_count = 0; |
| |
| /* If the ACK PNI is equal to the target PNI - 1 means |
| * that the initiator did not receive the previous PDU |
| * sent by the target so re-send it. |
| */ |
| if (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) == |
| ddev->curr_nfc_dep_pni) { |
| rc = digital_tg_send_saved_skb(ddev); |
| if (rc) |
| goto exit; |
| |
| goto free_resp; |
| } |
| |
| /* Otherwise, the target did not receive the previous |
| * ACK PDU from the initiator. Fallback to normal |
| * processing of chained PDU then. |
| */ |
| } |
| |
| /* Keep on sending chained PDU */ |
| if (!ddev->chaining_skb || |
| DIGITAL_NFC_DEP_PFB_PNI(pfb) != |
| ddev->curr_nfc_dep_pni) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| |
| rc = digital_tg_send_dep_res(ddev, ddev->chaining_skb); |
| if (rc) |
| goto exit; |
| |
| goto free_resp; |
| case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
| if (DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { |
| rc = -EINVAL; |
| goto exit; |
| } |
| |
| rc = digital_tg_send_atn(ddev); |
| if (rc) |
| goto exit; |
| |
| ddev->atn_count++; |
| |
| goto free_resp; |
| } |
| |
| rc = nfc_tm_data_received(ddev->nfc_dev, resp); |
| if (rc) |
| resp = NULL; |
| |
| exit: |
| kfree_skb(ddev->chaining_skb); |
| ddev->chaining_skb = NULL; |
| |
| ddev->atn_count = 0; |
| |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| |
| if (rc) |
| kfree_skb(resp); |
| |
| return; |
| |
| free_resp: |
| dev_kfree_skb(resp); |
| } |
| |
| int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) |
| { |
| struct digital_dep_req_res *dep_res; |
| struct sk_buff *chaining_skb, *tmp_skb; |
| int rc; |
| |
| skb_push(skb, sizeof(struct digital_dep_req_res)); |
| |
| dep_res = (struct digital_dep_req_res *)skb->data; |
| |
| dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| dep_res->cmd = DIGITAL_CMD_DEP_RES; |
| dep_res->pfb = ddev->curr_nfc_dep_pni; |
| |
| if (ddev->did) { |
| dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; |
| |
| skb_put_data(skb, &ddev->did, sizeof(ddev->did)); |
| } |
| |
| ddev->curr_nfc_dep_pni = |
| DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); |
| |
| chaining_skb = ddev->chaining_skb; |
| |
| tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_res, NULL); |
| if (IS_ERR(tmp_skb)) |
| return PTR_ERR(tmp_skb); |
| |
| digital_skb_push_dep_sod(ddev, tmp_skb); |
| |
| ddev->skb_add_crc(tmp_skb); |
| |
| ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL); |
| |
| rc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req, |
| NULL); |
| if (rc) { |
| if (tmp_skb != skb) |
| kfree_skb(tmp_skb); |
| |
| kfree_skb(chaining_skb); |
| ddev->chaining_skb = NULL; |
| |
| kfree_skb(ddev->saved_skb); |
| ddev->saved_skb = NULL; |
| } |
| |
| return rc; |
| } |
| |
| static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, |
| void *arg, struct sk_buff *resp) |
| { |
| u8 rf_tech = (unsigned long)arg; |
| |
| if (IS_ERR(resp)) |
| return; |
| |
| digital_tg_set_rf_tech(ddev, rf_tech); |
| |
| digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); |
| |
| digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); |
| |
| dev_kfree_skb(resp); |
| } |
| |
| static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, |
| u8 rf_tech) |
| { |
| struct digital_psl_res *psl_res; |
| struct sk_buff *skb; |
| int rc; |
| |
| skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_put(skb, sizeof(struct digital_psl_res)); |
| |
| psl_res = (struct digital_psl_res *)skb->data; |
| |
| psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| psl_res->cmd = DIGITAL_CMD_PSL_RES; |
| psl_res->did = did; |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| ddev->curr_nfc_dep_pni = 0; |
| |
| rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, |
| (void *)(unsigned long)rf_tech); |
| if (rc) |
| kfree_skb(skb); |
| |
| return rc; |
| } |
| |
| static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, |
| struct sk_buff *resp) |
| { |
| int rc; |
| struct digital_psl_req *psl_req; |
| u8 rf_tech; |
| u8 dsi, payload_size, payload_bits; |
| |
| if (IS_ERR(resp)) { |
| rc = PTR_ERR(resp); |
| resp = NULL; |
| goto exit; |
| } |
| |
| rc = ddev->skb_check_crc(resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.6"); |
| goto exit; |
| } |
| |
| rc = digital_skb_pull_dep_sod(ddev, resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.2"); |
| goto exit; |
| } |
| |
| psl_req = (struct digital_psl_req *)resp->data; |
| |
| if (resp->len != sizeof(struct digital_psl_req) || |
| psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || |
| psl_req->cmd != DIGITAL_CMD_PSL_REQ) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| dsi = (psl_req->brs >> 3) & 0x07; |
| switch (dsi) { |
| case 0: |
| rf_tech = NFC_DIGITAL_RF_TECH_106A; |
| break; |
| case 1: |
| rf_tech = NFC_DIGITAL_RF_TECH_212F; |
| break; |
| case 2: |
| rf_tech = NFC_DIGITAL_RF_TECH_424F; |
| break; |
| default: |
| pr_err("Unsupported dsi value %d\n", dsi); |
| goto exit; |
| } |
| |
| payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl); |
| payload_size = digital_payload_bits_to_size(payload_bits); |
| |
| if (!payload_size || (payload_size > min(ddev->local_payload_max, |
| ddev->remote_payload_max))) { |
| rc = -EINVAL; |
| goto exit; |
| } |
| |
| ddev->local_payload_max = payload_size; |
| ddev->remote_payload_max = payload_size; |
| |
| rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); |
| |
| exit: |
| kfree_skb(resp); |
| } |
| |
| static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, |
| void *arg, struct sk_buff *resp) |
| { |
| int offset; |
| |
| if (IS_ERR(resp)) { |
| digital_poll_next_tech(ddev); |
| return; |
| } |
| |
| offset = 2; |
| if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) |
| offset++; |
| |
| ddev->atn_count = 0; |
| |
| if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) |
| digital_tg_recv_psl_req(ddev, arg, resp); |
| else |
| digital_tg_recv_dep_req(ddev, arg, resp); |
| } |
| |
| static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, |
| struct digital_atr_req *atr_req) |
| { |
| struct digital_atr_res *atr_res; |
| struct sk_buff *skb; |
| u8 *gb, payload_bits; |
| size_t gb_len; |
| int rc; |
| |
| gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); |
| if (!gb) |
| gb_len = 0; |
| |
| skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); |
| if (!skb) |
| return -ENOMEM; |
| |
| skb_put(skb, sizeof(struct digital_atr_res)); |
| atr_res = (struct digital_atr_res *)skb->data; |
| |
| memset(atr_res, 0, sizeof(struct digital_atr_res)); |
| |
| atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| atr_res->cmd = DIGITAL_CMD_ATR_RES; |
| memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); |
| atr_res->to = DIGITAL_NFC_DEP_TG_MAX_WT; |
| |
| ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
| payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); |
| atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); |
| |
| if (gb_len) { |
| skb_put(skb, gb_len); |
| |
| atr_res->pp |= DIGITAL_GB_BIT; |
| memcpy(atr_res->gb, gb, gb_len); |
| } |
| |
| digital_skb_push_dep_sod(ddev, skb); |
| |
| ddev->skb_add_crc(skb); |
| |
| ddev->curr_nfc_dep_pni = 0; |
| |
| rc = digital_tg_send_cmd(ddev, skb, 999, |
| digital_tg_send_atr_res_complete, NULL); |
| if (rc) |
| kfree_skb(skb); |
| |
| return rc; |
| } |
| |
| void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, |
| struct sk_buff *resp) |
| { |
| int rc; |
| struct digital_atr_req *atr_req; |
| size_t gb_len, min_size; |
| u8 poll_tech_count, payload_bits; |
| |
| if (IS_ERR(resp)) { |
| rc = PTR_ERR(resp); |
| resp = NULL; |
| goto exit; |
| } |
| |
| if (!resp->len) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { |
| min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; |
| digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A); |
| } else { |
| min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; |
| digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F); |
| } |
| |
| if (resp->len < min_size) { |
| rc = -EIO; |
| goto exit; |
| } |
| |
| ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK; |
| |
| rc = ddev->skb_check_crc(resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.6"); |
| goto exit; |
| } |
| |
| rc = digital_skb_pull_dep_sod(ddev, resp); |
| if (rc) { |
| PROTOCOL_ERR("14.4.1.2"); |
| goto exit; |
| } |
| |
| atr_req = (struct digital_atr_req *)resp->data; |
| |
| if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || |
| atr_req->cmd != DIGITAL_CMD_ATR_REQ || |
| atr_req->did > DIGITAL_DID_MAX) { |
| rc = -EINVAL; |
| goto exit; |
| } |
| |
| payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp); |
| ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); |
| |
| if (!ddev->remote_payload_max) { |
| rc = -EINVAL; |
| goto exit; |
| } |
| |
| ddev->did = atr_req->did; |
| |
| rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
| NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); |
| if (rc) |
| goto exit; |
| |
| rc = digital_tg_send_atr_res(ddev, atr_req); |
| if (rc) |
| goto exit; |
| |
| gb_len = resp->len - sizeof(struct digital_atr_req); |
| |
| poll_tech_count = ddev->poll_tech_count; |
| ddev->poll_tech_count = 0; |
| |
| rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, |
| NFC_COMM_PASSIVE, atr_req->gb, gb_len); |
| if (rc) { |
| ddev->poll_tech_count = poll_tech_count; |
| goto exit; |
| } |
| |
| rc = 0; |
| exit: |
| if (rc) |
| digital_poll_next_tech(ddev); |
| |
| dev_kfree_skb(resp); |
| } |
