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1633 lines
34 KiB
1633 lines
34 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* NFC Digital Protocol stack |
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* Copyright (c) 2013, Intel Corporation. |
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*/ |
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|
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#define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
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|
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#include "digital.h" |
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|
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#define DIGITAL_NFC_DEP_N_RETRY_NACK 2 |
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#define DIGITAL_NFC_DEP_N_RETRY_ATN 2 |
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|
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#define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4 |
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#define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5 |
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#define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0 |
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#define DIGITAL_CMD_ATR_REQ 0x00 |
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#define DIGITAL_CMD_ATR_RES 0x01 |
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#define DIGITAL_CMD_PSL_REQ 0x04 |
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#define DIGITAL_CMD_PSL_RES 0x05 |
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#define DIGITAL_CMD_DEP_REQ 0x06 |
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#define DIGITAL_CMD_DEP_RES 0x07 |
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#define DIGITAL_ATR_REQ_MIN_SIZE 16 |
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#define DIGITAL_ATR_REQ_MAX_SIZE 64 |
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#define DIGITAL_ATR_RES_TO_WT(s) ((s) & 0xF) |
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#define DIGITAL_DID_MAX 14 |
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#define DIGITAL_PAYLOAD_SIZE_MAX 254 |
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#define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4) |
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#define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3) |
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#define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3) |
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#define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3) |
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#define DIGITAL_GB_BIT 0x02 |
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#define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) |
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#define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 |
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#define DIGITAL_NFC_DEP_PFB_MI_BIT 0x10 |
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#define DIGITAL_NFC_DEP_PFB_NACK_BIT 0x10 |
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#define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04 |
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#define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ |
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((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) |
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#define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_MI_BIT) |
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#define DIGITAL_NFC_DEP_NACK_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_NACK_BIT) |
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#define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) |
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#define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT) |
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#define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) |
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#define DIGITAL_NFC_DEP_RTOX_VALUE(data) ((data) & 0x3F) |
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#define DIGITAL_NFC_DEP_RTOX_MAX 59 |
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#define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 |
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#define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 |
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#define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 |
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struct digital_atr_req { |
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u8 dir; |
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u8 cmd; |
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u8 nfcid3[10]; |
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u8 did; |
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u8 bs; |
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u8 br; |
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u8 pp; |
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u8 gb[]; |
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} __packed; |
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struct digital_atr_res { |
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u8 dir; |
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u8 cmd; |
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u8 nfcid3[10]; |
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u8 did; |
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u8 bs; |
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u8 br; |
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u8 to; |
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u8 pp; |
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u8 gb[]; |
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} __packed; |
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struct digital_psl_req { |
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u8 dir; |
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u8 cmd; |
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u8 did; |
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u8 brs; |
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u8 fsl; |
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} __packed; |
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struct digital_psl_res { |
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u8 dir; |
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u8 cmd; |
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u8 did; |
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} __packed; |
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struct digital_dep_req_res { |
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u8 dir; |
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u8 cmd; |
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u8 pfb; |
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} __packed; |
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static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, |
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struct sk_buff *resp); |
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static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
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struct sk_buff *resp); |
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static const u8 digital_payload_bits_map[4] = { |
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[0] = 64, |
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[1] = 128, |
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[2] = 192, |
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[3] = 254 |
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}; |
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/* Response Waiting Time for ATR_RES PDU in ms |
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* |
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* RWT(ATR_RES) = RWT(nfcdep,activation) + dRWT(nfcdep) + dT(nfcdep,initiator) |
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* |
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* with: |
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* RWT(nfcdep,activation) = 4096 * 2^12 / f(c) s |
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* dRWT(nfcdep) = 16 / f(c) s |
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* dT(nfcdep,initiator) = 100 ms |
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* f(c) = 13560000 Hz |
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*/ |
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#define DIGITAL_ATR_RES_RWT 1337 |
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|
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/* Response Waiting Time for other DEP PDUs in ms |
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* |
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* max_rwt = rwt + dRWT(nfcdep) + dT(nfcdep,initiator) |
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* |
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* with: |
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* rwt = (256 * 16 / f(c)) * 2^wt s |
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* dRWT(nfcdep) = 16 / f(c) s |
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* dT(nfcdep,initiator) = 100 ms |
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* f(c) = 13560000 Hz |
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* 0 <= wt <= 14 (given by the target by the TO field of ATR_RES response) |
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*/ |
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#define DIGITAL_NFC_DEP_IN_MAX_WT 14 |
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#define DIGITAL_NFC_DEP_TG_MAX_WT 14 |
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static const u16 digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT + 1] = { |
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100, 101, 101, 102, 105, |
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110, 119, 139, 177, 255, |
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409, 719, 1337, 2575, 5049, |
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}; |
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static u8 digital_payload_bits_to_size(u8 payload_bits) |
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{ |
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if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map)) |
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return 0; |
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|
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return digital_payload_bits_map[payload_bits]; |
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} |
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static u8 digital_payload_size_to_bits(u8 payload_size) |
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{ |
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int i; |
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for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++) |
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if (digital_payload_bits_map[i] == payload_size) |
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return i; |
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return 0xff; |
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} |
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static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, |
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struct sk_buff *skb) |
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{ |
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skb_push(skb, sizeof(u8)); |
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skb->data[0] = skb->len; |
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if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) |
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*(u8 *)skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; |
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} |
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static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, |
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struct sk_buff *skb) |
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{ |
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u8 size; |
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|
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if (skb->len < 2) |
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return -EIO; |
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|
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if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) |
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skb_pull(skb, sizeof(u8)); |
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size = skb->data[0]; |
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if (size != skb->len) |
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return -EIO; |
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skb_pull(skb, sizeof(u8)); |
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return 0; |
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} |
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static struct sk_buff * |
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digital_send_dep_data_prep(struct nfc_digital_dev *ddev, struct sk_buff *skb, |
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struct digital_dep_req_res *dep_req_res, |
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struct digital_data_exch *data_exch) |
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{ |
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struct sk_buff *new_skb; |
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|
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if (skb->len > ddev->remote_payload_max) { |
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dep_req_res->pfb |= DIGITAL_NFC_DEP_PFB_MI_BIT; |
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new_skb = digital_skb_alloc(ddev, ddev->remote_payload_max); |
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if (!new_skb) { |
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kfree_skb(ddev->chaining_skb); |
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ddev->chaining_skb = NULL; |
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return ERR_PTR(-ENOMEM); |
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} |
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skb_put_data(new_skb, skb->data, ddev->remote_payload_max); |
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skb_pull(skb, ddev->remote_payload_max); |
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ddev->chaining_skb = skb; |
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ddev->data_exch = data_exch; |
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} else { |
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ddev->chaining_skb = NULL; |
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new_skb = skb; |
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} |
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return new_skb; |
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} |
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static struct sk_buff * |
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digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb, |
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struct sk_buff *resp, |
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int (*send_ack)(struct nfc_digital_dev *ddev, |
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struct digital_data_exch |
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*data_exch), |
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struct digital_data_exch *data_exch) |
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{ |
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struct sk_buff *new_skb; |
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int rc; |
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if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) { |
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ddev->chaining_skb = |
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nfc_alloc_recv_skb(8 * ddev->local_payload_max, |
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GFP_KERNEL); |
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if (!ddev->chaining_skb) { |
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rc = -ENOMEM; |
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goto error; |
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} |
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} |
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if (ddev->chaining_skb) { |
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if (resp->len > skb_tailroom(ddev->chaining_skb)) { |
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new_skb = skb_copy_expand(ddev->chaining_skb, |
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skb_headroom( |
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ddev->chaining_skb), |
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8 * ddev->local_payload_max, |
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GFP_KERNEL); |
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if (!new_skb) { |
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rc = -ENOMEM; |
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goto error; |
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} |
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kfree_skb(ddev->chaining_skb); |
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ddev->chaining_skb = new_skb; |
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} |
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skb_put_data(ddev->chaining_skb, resp->data, resp->len); |
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kfree_skb(resp); |
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resp = NULL; |
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if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { |
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rc = send_ack(ddev, data_exch); |
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if (rc) |
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goto error; |
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return NULL; |
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} |
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resp = ddev->chaining_skb; |
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ddev->chaining_skb = NULL; |
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} |
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return resp; |
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error: |
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kfree_skb(resp); |
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kfree_skb(ddev->chaining_skb); |
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ddev->chaining_skb = NULL; |
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return ERR_PTR(rc); |
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} |
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static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg, |
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struct sk_buff *resp) |
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{ |
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struct nfc_target *target = arg; |
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struct digital_psl_res *psl_res; |
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int rc; |
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if (IS_ERR(resp)) { |
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rc = PTR_ERR(resp); |
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resp = NULL; |
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goto exit; |
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} |
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rc = ddev->skb_check_crc(resp); |
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if (rc) { |
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PROTOCOL_ERR("14.4.1.6"); |
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goto exit; |
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} |
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rc = digital_skb_pull_dep_sod(ddev, resp); |
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if (rc) { |
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PROTOCOL_ERR("14.4.1.2"); |
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goto exit; |
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} |
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psl_res = (struct digital_psl_res *)resp->data; |
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if ((resp->len != sizeof(*psl_res)) || |
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(psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) || |
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(psl_res->cmd != DIGITAL_CMD_PSL_RES)) { |
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rc = -EIO; |
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goto exit; |
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} |
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rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, |
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NFC_DIGITAL_RF_TECH_424F); |
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if (rc) |
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goto exit; |
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rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
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NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); |
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if (rc) |
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goto exit; |
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if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) && |
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(ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) { |
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ddev->skb_add_crc = digital_skb_add_crc_f; |
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ddev->skb_check_crc = digital_skb_check_crc_f; |
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} |
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ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F; |
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nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
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NFC_RF_INITIATOR); |
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ddev->curr_nfc_dep_pni = 0; |
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exit: |
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dev_kfree_skb(resp); |
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if (rc) |
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ddev->curr_protocol = 0; |
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} |
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static int digital_in_send_psl_req(struct nfc_digital_dev *ddev, |
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struct nfc_target *target) |
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{ |
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struct sk_buff *skb; |
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struct digital_psl_req *psl_req; |
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int rc; |
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u8 payload_size, payload_bits; |
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skb = digital_skb_alloc(ddev, sizeof(*psl_req)); |
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if (!skb) |
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return -ENOMEM; |
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skb_put(skb, sizeof(*psl_req)); |
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psl_req = (struct digital_psl_req *)skb->data; |
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psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
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psl_req->cmd = DIGITAL_CMD_PSL_REQ; |
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psl_req->did = 0; |
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psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */ |
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payload_size = min(ddev->local_payload_max, ddev->remote_payload_max); |
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payload_bits = digital_payload_size_to_bits(payload_size); |
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psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits); |
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ddev->local_payload_max = payload_size; |
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ddev->remote_payload_max = payload_size; |
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digital_skb_push_dep_sod(ddev, skb); |
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ddev->skb_add_crc(skb); |
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rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
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digital_in_recv_psl_res, target); |
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if (rc) |
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kfree_skb(skb); |
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return rc; |
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} |
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static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, |
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struct sk_buff *resp) |
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{ |
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struct nfc_target *target = arg; |
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struct digital_atr_res *atr_res; |
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u8 gb_len, payload_bits; |
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u8 wt; |
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int rc; |
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if (IS_ERR(resp)) { |
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rc = PTR_ERR(resp); |
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resp = NULL; |
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goto exit; |
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} |
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rc = ddev->skb_check_crc(resp); |
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if (rc) { |
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PROTOCOL_ERR("14.4.1.6"); |
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goto exit; |
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} |
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rc = digital_skb_pull_dep_sod(ddev, resp); |
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if (rc) { |
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PROTOCOL_ERR("14.4.1.2"); |
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goto exit; |
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} |
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if (resp->len < sizeof(struct digital_atr_res)) { |
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rc = -EIO; |
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goto exit; |
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} |
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gb_len = resp->len - sizeof(struct digital_atr_res); |
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atr_res = (struct digital_atr_res *)resp->data; |
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|
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wt = DIGITAL_ATR_RES_TO_WT(atr_res->to); |
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if (wt > DIGITAL_NFC_DEP_IN_MAX_WT) |
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wt = DIGITAL_NFC_DEP_IN_MAX_WT; |
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ddev->dep_rwt = digital_rwt_map[wt]; |
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|
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payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp); |
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ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); |
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|
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if (!ddev->remote_payload_max) { |
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rc = -EINVAL; |
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goto exit; |
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} |
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|
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rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); |
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if (rc) |
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goto exit; |
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|
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if ((ddev->protocols & NFC_PROTO_FELICA_MASK) && |
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(ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) { |
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rc = digital_in_send_psl_req(ddev, target); |
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if (!rc) |
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goto exit; |
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} |
|
|
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rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
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NFC_RF_INITIATOR); |
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|
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ddev->curr_nfc_dep_pni = 0; |
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|
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exit: |
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dev_kfree_skb(resp); |
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|
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if (rc) |
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ddev->curr_protocol = 0; |
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} |
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|
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int digital_in_send_atr_req(struct nfc_digital_dev *ddev, |
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struct nfc_target *target, __u8 comm_mode, __u8 *gb, |
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size_t gb_len) |
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{ |
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struct sk_buff *skb; |
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struct digital_atr_req *atr_req; |
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uint size; |
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int rc; |
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u8 payload_bits; |
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|
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size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; |
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|
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if (size > DIGITAL_ATR_REQ_MAX_SIZE) { |
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PROTOCOL_ERR("14.6.1.1"); |
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return -EINVAL; |
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} |
|
|
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skb = digital_skb_alloc(ddev, size); |
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if (!skb) |
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return -ENOMEM; |
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|
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skb_put(skb, sizeof(struct digital_atr_req)); |
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|
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atr_req = (struct digital_atr_req *)skb->data; |
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memset(atr_req, 0, sizeof(struct digital_atr_req)); |
|
|
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atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
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atr_req->cmd = DIGITAL_CMD_ATR_REQ; |
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if (target->nfcid2_len) |
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memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
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else |
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get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
|
|
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atr_req->did = 0; |
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atr_req->bs = 0; |
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atr_req->br = 0; |
|
|
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ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
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payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); |
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atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); |
|
|
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if (gb_len) { |
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atr_req->pp |= DIGITAL_GB_BIT; |
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skb_put_data(skb, gb, gb_len); |
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} |
|
|
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digital_skb_push_dep_sod(ddev, skb); |
|
|
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ddev->skb_add_crc(skb); |
|
|
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rc = digital_in_send_cmd(ddev, skb, DIGITAL_ATR_RES_RWT, |
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digital_in_recv_atr_res, target); |
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if (rc) |
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kfree_skb(skb); |
|
|
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return rc; |
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} |
|
|
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static int digital_in_send_ack(struct nfc_digital_dev *ddev, |
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struct digital_data_exch *data_exch) |
|
{ |
|
struct digital_dep_req_res *dep_req; |
|
struct sk_buff *skb; |
|
int rc; |
|
|
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skb = digital_skb_alloc(ddev, 1); |
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if (!skb) |
|
return -ENOMEM; |
|
|
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skb_push(skb, sizeof(struct digital_dep_req_res)); |
|
|
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dep_req = (struct digital_dep_req_res *)skb->data; |
|
|
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dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
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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); |
|
}
|
|
|