cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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core.c (3858B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * NCI based Driver for STMicroelectronics NFC Chip
      4 *
      5 * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/nfc.h>
     10#include <net/nfc/nci.h>
     11#include <net/nfc/nci_core.h>
     12
     13#include "st-nci.h"
     14
     15#define DRIVER_DESC "NCI NFC driver for ST_NCI"
     16
     17#define ST_NCI1_X_PROPRIETARY_ISO15693 0x83
     18
     19static int st_nci_init(struct nci_dev *ndev)
     20{
     21	struct nci_mode_set_cmd cmd;
     22
     23	cmd.cmd_type = ST_NCI_SET_NFC_MODE;
     24	cmd.mode = 1;
     25
     26	return nci_prop_cmd(ndev, ST_NCI_CORE_PROP,
     27			sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
     28}
     29
     30static int st_nci_open(struct nci_dev *ndev)
     31{
     32	struct st_nci_info *info = nci_get_drvdata(ndev);
     33	int r;
     34
     35	if (test_and_set_bit(ST_NCI_RUNNING, &info->flags))
     36		return 0;
     37
     38	r = ndlc_open(info->ndlc);
     39	if (r)
     40		clear_bit(ST_NCI_RUNNING, &info->flags);
     41
     42	return r;
     43}
     44
     45static int st_nci_close(struct nci_dev *ndev)
     46{
     47	struct st_nci_info *info = nci_get_drvdata(ndev);
     48
     49	if (!test_bit(ST_NCI_RUNNING, &info->flags))
     50		return 0;
     51
     52	ndlc_close(info->ndlc);
     53
     54	clear_bit(ST_NCI_RUNNING, &info->flags);
     55
     56	return 0;
     57}
     58
     59static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
     60{
     61	struct st_nci_info *info = nci_get_drvdata(ndev);
     62
     63	skb->dev = (void *)ndev;
     64
     65	if (!test_bit(ST_NCI_RUNNING, &info->flags))
     66		return -EBUSY;
     67
     68	return ndlc_send(info->ndlc, skb);
     69}
     70
     71static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
     72					 __u8 rf_protocol)
     73{
     74	return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
     75		NFC_PROTO_ISO15693_MASK : 0;
     76}
     77
     78static int st_nci_prop_rsp_packet(struct nci_dev *ndev,
     79					struct sk_buff *skb)
     80{
     81	__u8 status = skb->data[0];
     82
     83	nci_req_complete(ndev, status);
     84	return 0;
     85}
     86
     87static const struct nci_driver_ops st_nci_prop_ops[] = {
     88	{
     89		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
     90					  ST_NCI_CORE_PROP),
     91		.rsp = st_nci_prop_rsp_packet,
     92	},
     93};
     94
     95static const struct nci_ops st_nci_ops = {
     96	.init = st_nci_init,
     97	.open = st_nci_open,
     98	.close = st_nci_close,
     99	.send = st_nci_send,
    100	.get_rfprotocol = st_nci_get_rfprotocol,
    101	.discover_se = st_nci_discover_se,
    102	.enable_se = st_nci_enable_se,
    103	.disable_se = st_nci_disable_se,
    104	.se_io = st_nci_se_io,
    105	.hci_load_session = st_nci_hci_load_session,
    106	.hci_event_received = st_nci_hci_event_received,
    107	.hci_cmd_received = st_nci_hci_cmd_received,
    108	.prop_ops = st_nci_prop_ops,
    109	.n_prop_ops = ARRAY_SIZE(st_nci_prop_ops),
    110};
    111
    112int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
    113		 int phy_tailroom, struct st_nci_se_status *se_status)
    114{
    115	struct st_nci_info *info;
    116	int r;
    117	u32 protocols;
    118
    119	info = devm_kzalloc(ndlc->dev,
    120			sizeof(struct st_nci_info), GFP_KERNEL);
    121	if (!info)
    122		return -ENOMEM;
    123
    124	protocols = NFC_PROTO_JEWEL_MASK
    125		| NFC_PROTO_MIFARE_MASK
    126		| NFC_PROTO_FELICA_MASK
    127		| NFC_PROTO_ISO14443_MASK
    128		| NFC_PROTO_ISO14443_B_MASK
    129		| NFC_PROTO_ISO15693_MASK
    130		| NFC_PROTO_NFC_DEP_MASK;
    131
    132	BUILD_BUG_ON(ARRAY_SIZE(st_nci_prop_ops) > NCI_MAX_PROPRIETARY_CMD);
    133	ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
    134					phy_headroom, phy_tailroom);
    135	if (!ndlc->ndev) {
    136		pr_err("Cannot allocate nfc ndev\n");
    137		return -ENOMEM;
    138	}
    139	info->ndlc = ndlc;
    140
    141	nci_set_drvdata(ndlc->ndev, info);
    142
    143	r = st_nci_vendor_cmds_init(ndlc->ndev);
    144	if (r) {
    145		pr_err("Cannot register proprietary vendor cmds\n");
    146		goto err_reg_dev;
    147	}
    148
    149	r = nci_register_device(ndlc->ndev);
    150	if (r) {
    151		pr_err("Cannot register nfc device to nci core\n");
    152		goto err_reg_dev;
    153	}
    154
    155	return st_nci_se_init(ndlc->ndev, se_status);
    156
    157err_reg_dev:
    158	nci_free_device(ndlc->ndev);
    159	return r;
    160}
    161EXPORT_SYMBOL_GPL(st_nci_probe);
    162
    163void st_nci_remove(struct nci_dev *ndev)
    164{
    165	struct st_nci_info *info = nci_get_drvdata(ndev);
    166
    167	ndlc_close(info->ndlc);
    168
    169	nci_unregister_device(ndev);
    170	nci_free_device(ndev);
    171}
    172EXPORT_SYMBOL_GPL(st_nci_remove);
    173
    174MODULE_LICENSE("GPL");
    175MODULE_DESCRIPTION(DRIVER_DESC);