1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NCI based driver for Samsung S3FWRN5 NFC chip
4 *
5 * Copyright (C) 2015 Samsung Electrnoics
6 * Robert Baldyga <r.baldyga@samsung.com>
7 */
8
9#include <linux/module.h>
10#include <net/nfc/nci_core.h>
11
12#include "s3fwrn5.h"
13#include "firmware.h"
14#include "nci.h"
15
16#define S3FWRN5_NFC_PROTOCOLS  (NFC_PROTO_JEWEL_MASK | \
17				NFC_PROTO_MIFARE_MASK | \
18				NFC_PROTO_FELICA_MASK | \
19				NFC_PROTO_ISO14443_MASK | \
20				NFC_PROTO_ISO14443_B_MASK | \
21				NFC_PROTO_ISO15693_MASK)
22
23static int s3fwrn5_firmware_update(struct s3fwrn5_info *info)
24{
25	bool need_update;
26	int ret;
27
28	s3fwrn5_fw_init(&info->fw_info, "sec_s3fwrn5_firmware.bin");
29
30	/* Update firmware */
31
32	s3fwrn5_set_wake(info, false);
33	s3fwrn5_set_mode(info, S3FWRN5_MODE_FW);
34
35	ret = s3fwrn5_fw_setup(&info->fw_info);
36	if (ret < 0)
37		return ret;
38
39	need_update = s3fwrn5_fw_check_version(&info->fw_info,
40		info->ndev->manufact_specific_info);
41	if (!need_update)
42		goto out;
43
44	dev_info(&info->ndev->nfc_dev->dev, "Detected new firmware version\n");
45
46	ret = s3fwrn5_fw_download(&info->fw_info);
47	if (ret < 0)
48		goto out;
49
50	/* Update RF configuration */
51
52	s3fwrn5_set_mode(info, S3FWRN5_MODE_NCI);
53
54	s3fwrn5_set_wake(info, true);
55	ret = s3fwrn5_nci_rf_configure(info, "sec_s3fwrn5_rfreg.bin");
56	s3fwrn5_set_wake(info, false);
57
58out:
59	s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
60	s3fwrn5_fw_cleanup(&info->fw_info);
61	return ret;
62}
63
64static int s3fwrn5_nci_open(struct nci_dev *ndev)
65{
66	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
67
68	if (s3fwrn5_get_mode(info) != S3FWRN5_MODE_COLD)
69		return  -EBUSY;
70
71	s3fwrn5_set_mode(info, S3FWRN5_MODE_NCI);
72	s3fwrn5_set_wake(info, true);
73
74	return 0;
75}
76
77static int s3fwrn5_nci_close(struct nci_dev *ndev)
78{
79	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
80
81	s3fwrn5_set_wake(info, false);
82	s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
83
84	return 0;
85}
86
87static int s3fwrn5_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
88{
89	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
90	int ret;
91
92	mutex_lock(&info->mutex);
93
94	if (s3fwrn5_get_mode(info) != S3FWRN5_MODE_NCI) {
95		mutex_unlock(&info->mutex);
96		return -EINVAL;
97	}
98
99	ret = s3fwrn5_write(info, skb);
100	if (ret < 0) {
101		kfree_skb(skb);
102		mutex_unlock(&info->mutex);
103		return ret;
104	}
105
106	consume_skb(skb);
107	mutex_unlock(&info->mutex);
108	return 0;
109}
110
111static int s3fwrn5_nci_post_setup(struct nci_dev *ndev)
112{
113	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
114	int ret;
115
116	ret = s3fwrn5_firmware_update(info);
117	if (ret < 0)
118		goto out;
119
120	/* NCI core reset */
121
122	s3fwrn5_set_mode(info, S3FWRN5_MODE_NCI);
123	s3fwrn5_set_wake(info, true);
124
125	ret = nci_core_reset(info->ndev);
126	if (ret < 0)
127		goto out;
128
129	ret = nci_core_init(info->ndev);
130
131out:
132	return ret;
133}
134
135static struct nci_ops s3fwrn5_nci_ops = {
136	.open = s3fwrn5_nci_open,
137	.close = s3fwrn5_nci_close,
138	.send = s3fwrn5_nci_send,
139	.post_setup = s3fwrn5_nci_post_setup,
140};
141
142int s3fwrn5_probe(struct nci_dev **ndev, void *phy_id, struct device *pdev,
143	const struct s3fwrn5_phy_ops *phy_ops, unsigned int max_payload)
144{
145	struct s3fwrn5_info *info;
146	int ret;
147
148	info = devm_kzalloc(pdev, sizeof(*info), GFP_KERNEL);
149	if (!info)
150		return -ENOMEM;
151
152	info->phy_id = phy_id;
153	info->pdev = pdev;
154	info->phy_ops = phy_ops;
155	info->max_payload = max_payload;
156	mutex_init(&info->mutex);
157
158	s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
159
160	s3fwrn5_nci_get_prop_ops(&s3fwrn5_nci_ops.prop_ops,
161		&s3fwrn5_nci_ops.n_prop_ops);
162
163	info->ndev = nci_allocate_device(&s3fwrn5_nci_ops,
164		S3FWRN5_NFC_PROTOCOLS, 0, 0);
165	if (!info->ndev)
166		return -ENOMEM;
167
168	nci_set_parent_dev(info->ndev, pdev);
169	nci_set_drvdata(info->ndev, info);
170
171	ret = nci_register_device(info->ndev);
172	if (ret < 0) {
173		nci_free_device(info->ndev);
174		return ret;
175	}
176
177	info->fw_info.ndev = info->ndev;
178
179	*ndev = info->ndev;
180
181	return ret;
182}
183EXPORT_SYMBOL(s3fwrn5_probe);
184
185void s3fwrn5_remove(struct nci_dev *ndev)
186{
187	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
188
189	s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
190
191	nci_unregister_device(ndev);
192	nci_free_device(ndev);
193}
194EXPORT_SYMBOL(s3fwrn5_remove);
195
196int s3fwrn5_recv_frame(struct nci_dev *ndev, struct sk_buff *skb,
197	enum s3fwrn5_mode mode)
198{
199	switch (mode) {
200	case S3FWRN5_MODE_NCI:
201		return nci_recv_frame(ndev, skb);
202	case S3FWRN5_MODE_FW:
203		return s3fwrn5_fw_recv_frame(ndev, skb);
204	default:
205		kfree_skb(skb);
206		return -ENODEV;
207	}
208}
209EXPORT_SYMBOL(s3fwrn5_recv_frame);
210
211MODULE_LICENSE("GPL");
212MODULE_DESCRIPTION("Samsung S3FWRN5 NFC driver");
213MODULE_AUTHOR("Robert Baldyga <r.baldyga@samsung.com>");
214