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Release 4.8 net/nfc/digital_technology.c

Directory: net/nfc
/*
 * NFC Digital Protocol stack
 * Copyright (c) 2013, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */


#define pr_fmt(fmt) "digital: %s: " fmt, __func__

#include "digital.h"


#define DIGITAL_CMD_SENS_REQ    0x26

#define DIGITAL_CMD_ALL_REQ     0x52

#define DIGITAL_CMD_SEL_REQ_CL1 0x93

#define DIGITAL_CMD_SEL_REQ_CL2 0x95

#define DIGITAL_CMD_SEL_REQ_CL3 0x97


#define DIGITAL_SDD_REQ_SEL_PAR 0x20


#define DIGITAL_SDD_RES_CT  0x88

#define DIGITAL_SDD_RES_LEN 5


#define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))

#define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))

#define DIGITAL_SEL_RES_IS_T4T(sel_res) ((sel_res) & 0x20)

#define DIGITAL_SEL_RES_IS_NFC_DEP(sel_res) ((sel_res) & 0x40)


#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x0C00) == 0x0C00)

#define DIGITAL_SENS_RES_IS_VALID(sens_res) \
	((!((sens_res) & 0x001F) && (((sens_res) & 0x0C00) == 0x0C00)) || \
        (((sens_res) & 0x001F) && ((sens_res) & 0x0C00) != 0x0C00))


#define DIGITAL_MIFARE_READ_RES_LEN 16

#define DIGITAL_MIFARE_ACK_RES	0x0A


#define DIGITAL_CMD_SENSB_REQ			0x05

#define DIGITAL_SENSB_ADVANCED			BIT(5)

#define DIGITAL_SENSB_EXTENDED			BIT(4)

#define DIGITAL_SENSB_ALLB_REQ			BIT(3)

#define DIGITAL_SENSB_N(n)			((n) & 0x7)


#define DIGITAL_CMD_SENSB_RES			0x50


#define DIGITAL_CMD_ATTRIB_REQ			0x1D

#define DIGITAL_ATTRIB_P1_TR0_DEFAULT		(0x0 << 6)

#define DIGITAL_ATTRIB_P1_TR1_DEFAULT		(0x0 << 4)

#define DIGITAL_ATTRIB_P1_SUPRESS_EOS		BIT(3)

#define DIGITAL_ATTRIB_P1_SUPRESS_SOS		BIT(2)

#define DIGITAL_ATTRIB_P2_LISTEN_POLL_1		(0x0 << 6)

#define DIGITAL_ATTRIB_P2_POLL_LISTEN_1		(0x0 << 4)

#define DIGITAL_ATTRIB_P2_MAX_FRAME_256		0x8

#define DIGITAL_ATTRIB_P4_DID(n)		((n) & 0xf)


#define DIGITAL_CMD_SENSF_REQ	0x00

#define DIGITAL_CMD_SENSF_RES	0x01


#define DIGITAL_SENSF_RES_MIN_LENGTH 17

#define DIGITAL_SENSF_RES_RD_AP_B1   0x00

#define DIGITAL_SENSF_RES_RD_AP_B2   0x8F


#define DIGITAL_SENSF_REQ_RC_NONE 0

#define DIGITAL_SENSF_REQ_RC_SC   1

#define DIGITAL_SENSF_REQ_RC_AP   2


#define DIGITAL_CMD_ISO15693_INVENTORY_REQ	0x01


#define DIGITAL_ISO15693_REQ_FLAG_DATA_RATE	BIT(1)

#define DIGITAL_ISO15693_REQ_FLAG_INVENTORY	BIT(2)

#define DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS	BIT(5)

#define DIGITAL_ISO15693_RES_FLAG_ERROR		BIT(0)

#define DIGITAL_ISO15693_RES_IS_VALID(flags) \
	(!((flags) & DIGITAL_ISO15693_RES_FLAG_ERROR))


#define DIGITAL_ISO_DEP_I_PCB	 0x02

#define DIGITAL_ISO_DEP_PNI(pni) ((pni) & 0x01)


#define DIGITAL_ISO_DEP_PCB_TYPE(pcb) ((pcb) & 0xC0)


#define DIGITAL_ISO_DEP_I_BLOCK 0x00


#define DIGITAL_ISO_DEP_BLOCK_HAS_DID(pcb) ((pcb) & 0x08)


static const u8 digital_ats_fsc[] = {
	 16,  24,  32,  40,  48,  64,  96, 128,
};


#define DIGITAL_ATS_FSCI(t0) ((t0) & 0x0F)

#define DIGITAL_SENSB_FSCI(pi2) (((pi2) & 0xF0) >> 4)

#define DIGITAL_ATS_MAX_FSC  256


#define DIGITAL_RATS_BYTE1 0xE0

#define DIGITAL_RATS_PARAM 0x80


struct digital_sdd_res {
	
u8 nfcid1[4];
	
u8 bcc;
} 
__packed;


struct digital_sel_req {
	
u8 sel_cmd;
	
u8 b2;
	
u8 nfcid1[4];
	
u8 bcc;
} 
__packed;


struct digital_sensb_req {
	
u8 cmd;
	
u8 afi;
	
u8 param;
} 
__packed;


struct digital_sensb_res {
	
u8 cmd;
	
u8 nfcid0[4];
	
u8 app_data[4];
	
u8 proto_info[3];
} 
__packed;


struct digital_attrib_req {
	
u8 cmd;
	
u8 nfcid0[4];
	
u8 param1;
	
u8 param2;
	
u8 param3;
	
u8 param4;
} 
__packed;


struct digital_attrib_res {
	
u8 mbli_did;
} 
__packed;


struct digital_sensf_req {
	
u8 cmd;
	
u8 sc1;
	
u8 sc2;
	
u8 rc;
	
u8 tsn;
} 
__packed;


struct digital_sensf_res {
	
u8 cmd;
	
u8 nfcid2[8];
	
u8 pad0[2];
	
u8 pad1[3];
	
u8 mrti_check;
	
u8 mrti_update;
	
u8 pad2;
	
u8 rd[2];
} 
__packed;


struct digital_iso15693_inv_req {
	
u8 flags;
	
u8 cmd;
	
u8 mask_len;
	
u64 mask;
} 
__packed;


struct digital_iso15693_inv_res {
	
u8 flags;
	
u8 dsfid;
	
u64 uid;
} 
__packed;

static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
				   struct nfc_target *target);


int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev, struct sk_buff *skb) { u8 pcb; u8 block_type; if (skb->len < 1) return -EIO; pcb = *skb->data; block_type = DIGITAL_ISO_DEP_PCB_TYPE(pcb); /* No support fo R-block nor S-block */ if (block_type != DIGITAL_ISO_DEP_I_BLOCK) { pr_err("ISO_DEP R-block and S-block not supported\n"); return -EIO; } if (DIGITAL_ISO_DEP_BLOCK_HAS_DID(pcb)) { pr_err("DID field in ISO_DEP PCB not supported\n"); return -EIO; } skb_pull(skb, 1); return 0; }

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int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev, struct sk_buff *skb) { /* * Chaining not supported so skb->len + 1 PCB byte + 2 CRC bytes must * not be greater than remote FSC */ if (skb->len + 3 > ddev->target_fsc) return -EIO; skb_push(skb, 1); *skb->data = DIGITAL_ISO_DEP_I_PCB | ddev->curr_nfc_dep_pni; ddev->curr_nfc_dep_pni = DIGITAL_ISO_DEP_PNI(ddev->curr_nfc_dep_pni + 1); return 0; }

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static void digital_in_recv_ats(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = arg; u8 fsdi; int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (resp->len < 2) { rc = -EIO; goto exit; } fsdi = DIGITAL_ATS_FSCI(resp->data[1]); if (fsdi >= 8) ddev->target_fsc = DIGITAL_ATS_MAX_FSC; else ddev->target_fsc = digital_ats_fsc[fsdi]; ddev->curr_nfc_dep_pni = 0; rc = digital_target_found(ddev, target, NFC_PROTO_ISO14443); exit: dev_kfree_skb(resp); kfree(target); if (rc) digital_poll_next_tech(ddev); }

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static int digital_in_send_rats(struct nfc_digital_dev *ddev, struct nfc_target *target) { int rc; struct sk_buff *skb; skb = digital_skb_alloc(ddev, 2); if (!skb) return -ENOMEM; *skb_put(skb, 1) = DIGITAL_RATS_BYTE1; *skb_put(skb, 1) = DIGITAL_RATS_PARAM; rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_ats, target); if (rc) kfree_skb(skb); return rc; }

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static void digital_in_recv_sel_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = arg; int rc; u8 sel_res; u8 nfc_proto; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) { rc = digital_skb_check_crc_a(resp); if (rc) { PROTOCOL_ERR("4.4.1.3"); goto exit; } } if (!resp->len) { rc = -EIO; goto exit; } sel_res = resp->data[0]; if (!DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res)) { rc = digital_in_send_sdd_req(ddev, target); if (rc) goto exit; goto exit_free_skb; } target->sel_res = sel_res; if (DIGITAL_SEL_RES_IS_T2T(sel_res)) { nfc_proto = NFC_PROTO_MIFARE; } else if (DIGITAL_SEL_RES_IS_NFC_DEP(sel_res)) { nfc_proto = NFC_PROTO_NFC_DEP; } else if (DIGITAL_SEL_RES_IS_T4T(sel_res)) { rc = digital_in_send_rats(ddev, target); if (rc) goto exit; /* * Skip target_found and don't free it for now. This will be * done when receiving the ATS */ goto exit_free_skb; } else { rc = -EOPNOTSUPP; goto exit; } rc = digital_target_found(ddev, target, nfc_proto); exit: kfree(target); exit_free_skb: dev_kfree_skb(resp); if (rc) digital_poll_next_tech(ddev); }

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static int digital_in_send_sel_req(struct nfc_digital_dev *ddev, struct nfc_target *target, struct digital_sdd_res *sdd_res) { struct sk_buff *skb; struct digital_sel_req *sel_req; u8 sel_cmd; int rc; skb = digital_skb_alloc(ddev, sizeof(struct digital_sel_req)); if (!skb) return -ENOMEM; skb_put(skb, sizeof(struct digital_sel_req)); sel_req = (struct digital_sel_req *)skb->data; if (target->nfcid1_len <= 4) sel_cmd = DIGITAL_CMD_SEL_REQ_CL1; else if (target->nfcid1_len < 10) sel_cmd = DIGITAL_CMD_SEL_REQ_CL2; else sel_cmd = DIGITAL_CMD_SEL_REQ_CL3; sel_req->sel_cmd = sel_cmd; sel_req->b2 = 0x70; memcpy(sel_req->nfcid1, sdd_res->nfcid1, 4); sel_req->bcc = sdd_res->bcc; if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A); if (rc) goto exit; } else { digital_skb_add_crc_a(skb); } rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sel_res, target); exit: if (rc) kfree_skb(skb); return rc; }

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static void digital_in_recv_sdd_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = arg; struct digital_sdd_res *sdd_res; int rc; u8 offset, size; u8 i, bcc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (resp->len < DIGITAL_SDD_RES_LEN) { PROTOCOL_ERR("4.7.2.8"); rc = -EINVAL; goto exit; } sdd_res = (struct digital_sdd_res *)resp->data; for (i = 0, bcc = 0; i < 4; i++) bcc ^= sdd_res->nfcid1[i]; if (bcc != sdd_res->bcc) { PROTOCOL_ERR("4.7.2.6"); rc = -EINVAL; goto exit; } if (sdd_res->nfcid1[0] == DIGITAL_SDD_RES_CT) { offset = 1; size = 3; } else { offset = 0; size = 4; } memcpy(target->nfcid1 + target->nfcid1_len, sdd_res->nfcid1 + offset, size); target->nfcid1_len += size; rc = digital_in_send_sel_req(ddev, target, sdd_res); exit: dev_kfree_skb(resp); if (rc) { kfree(target); digital_poll_next_tech(ddev); } }

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static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev, struct nfc_target *target) { int rc; struct sk_buff *skb; u8 sel_cmd; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCA_STANDARD); if (rc) return rc; skb = digital_skb_alloc(ddev, 2); if (!skb) return -ENOMEM; if (target->nfcid1_len == 0) sel_cmd = DIGITAL_CMD_SEL_REQ_CL1; else if (target->nfcid1_len == 3) sel_cmd = DIGITAL_CMD_SEL_REQ_CL2; else sel_cmd = DIGITAL_CMD_SEL_REQ_CL3; *skb_put(skb, sizeof(u8)) = sel_cmd; *skb_put(skb, sizeof(u8)) = DIGITAL_SDD_REQ_SEL_PAR; return digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res, target); }

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static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = NULL; int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (resp->len < sizeof(u16)) { rc = -EIO; goto exit; } target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); if (!target) { rc = -ENOMEM; goto exit; } target->sens_res = __le16_to_cpu(*(__le16 *)resp->data); if (!DIGITAL_SENS_RES_IS_VALID(target->sens_res)) { PROTOCOL_ERR("4.6.3.3"); rc = -EINVAL; goto exit; } if (DIGITAL_SENS_RES_IS_T1T(target->sens_res)) rc = digital_target_found(ddev, target, NFC_PROTO_JEWEL); else rc = digital_in_send_sdd_req(ddev, target); exit: dev_kfree_skb(resp); if (rc) { kfree(target); digital_poll_next_tech(ddev); } }

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int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech) { struct sk_buff *skb; int rc; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, NFC_DIGITAL_RF_TECH_106A); if (rc) return rc; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCA_SHORT); if (rc) return rc; skb = digital_skb_alloc(ddev, 1); if (!skb) return -ENOMEM; *skb_put(skb, sizeof(u8)) = DIGITAL_CMD_SENS_REQ; rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sens_res, NULL); if (rc) kfree_skb(skb); return rc; }

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int digital_in_recv_mifare_res(struct sk_buff *resp) { /* Successful READ command response is 16 data bytes + 2 CRC bytes long. * Since the driver can't differentiate a ACK/NACK response from a valid * READ response, the CRC calculation must be handled at digital level * even if the driver supports it for this technology. */ if (resp->len == DIGITAL_MIFARE_READ_RES_LEN + DIGITAL_CRC_LEN) { if (digital_skb_check_crc_a(resp)) { PROTOCOL_ERR("9.4.1.2"); return -EIO; } return 0; } /* ACK response (i.e. successful WRITE). */ if (resp->len == 1 && resp->data[0] == DIGITAL_MIFARE_ACK_RES) { resp->data[0] = 0; return 0; } /* NACK and any other responses are treated as error. */ return -EIO; }

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static void digital_in_recv_attrib_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = arg; struct digital_attrib_res *attrib_res; int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (resp->len < sizeof(*attrib_res)) { PROTOCOL_ERR("12.6.2"); rc = -EIO; goto exit; } attrib_res = (struct digital_attrib_res *)resp->data; if (attrib_res->mbli_did & 0x0f) { PROTOCOL_ERR("12.6.2.1"); rc = -EIO; goto exit; } rc = digital_target_found(ddev, target, NFC_PROTO_ISO14443_B); exit: dev_kfree_skb(resp); kfree(target); if (rc) digital_poll_next_tech(ddev); }

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static int digital_in_send_attrib_req(struct nfc_digital_dev *ddev, struct nfc_target *target, struct digital_sensb_res *sensb_res) { struct digital_attrib_req *attrib_req; struct sk_buff *skb; int rc; skb = digital_skb_alloc(ddev, sizeof(*attrib_req)); if (!skb) return -ENOMEM; attrib_req = (struct digital_attrib_req *)skb_put(skb, sizeof(*attrib_req)); attrib_req->cmd = DIGITAL_CMD_ATTRIB_REQ; memcpy(attrib_req->nfcid0, sensb_res->nfcid0, sizeof(attrib_req->nfcid0)); attrib_req->param1 = DIGITAL_ATTRIB_P1_TR0_DEFAULT | DIGITAL_ATTRIB_P1_TR1_DEFAULT; attrib_req->param2 = DIGITAL_ATTRIB_P2_LISTEN_POLL_1 | DIGITAL_ATTRIB_P2_POLL_LISTEN_1 | DIGITAL_ATTRIB_P2_MAX_FRAME_256; attrib_req->param3 = sensb_res->proto_info[1] & 0x07; attrib_req->param4 = DIGITAL_ATTRIB_P4_DID(0); rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_attrib_res, target); if (rc) kfree_skb(skb); return rc; }

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static void digital_in_recv_sensb_res(struct nfc_digital_dev *ddev, void *arg, struct sk_buff *resp) { struct nfc_target *target = NULL; struct digital_sensb_res *sensb_res; u8 fsci; int rc; if (IS_ERR(resp)) { rc = PTR_ERR(resp); resp = NULL; goto exit; } if (resp->len != sizeof(*sensb_res)) { PROTOCOL_ERR("5.6.2.1"); rc = -EIO; goto exit; } sensb_res = (struct digital_sensb_res *)resp->data; if (sensb_res->cmd != DIGITAL_CMD_SENSB_RES) { PROTOCOL_ERR("5.6.2"); rc = -EIO; goto exit; } if (!(sensb_res->proto_info[1] & BIT(0))) { PROTOCOL_ERR("5.6.2.12"); rc = -EIO; goto exit; } if (sensb_res->proto_info[1] & BIT(3)) { PROTOCOL_ERR("5.6.2.16"); rc = -EIO; goto exit; } fsci = DIGITAL_SENSB_FSCI(sensb_res->proto_info[1]); if (fsci >= 8) ddev->target_fsc = DIGITAL_ATS_MAX_FSC; else ddev->target_fsc = digital_ats_fsc[fsci]; target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); if (!target) { rc = -ENOMEM; goto exit; } rc = digital_in_send_attrib_req(ddev, target, sensb_res); exit: dev_kfree_skb(resp); if (rc) { kfree(target); digital_poll_next_tech(ddev); } }

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int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech) { struct digital_sensb_req *sensb_req; struct sk_buff *skb; int rc; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, NFC_DIGITAL_RF_TECH_106B); if (rc) return rc; rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, NFC_DIGITAL_FRAMING_NFCB); if (rc) return rc; skb = digital_skb_alloc(ddev, sizeof(*sensb_req)); if (!skb) return -ENOMEM; sensb_req = (struct digital_sensb_req *)skb_put(skb, sizeof(*sensb_req)); sensb_req->cmd