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_init(struct s3fwrn5_info *info)
24{
25	struct s3fwrn5_fw_info *fw_info = &info->fw_info;
26	int ret;
27
28	s3fwrn5_fw_init(fw_info, "sec_s3fwrn5_firmware.bin");
29
30	/* Get firmware data */
31	ret = s3fwrn5_fw_request_firmware(fw_info);
32	if (ret < 0)
33		dev_err(&fw_info->ndev->nfc_dev->dev,
34			"Failed to get fw file, ret=%02x\n", ret);
35	return ret;
36}
37
38static int s3fwrn5_firmware_update(struct s3fwrn5_info *info)
39{
40	bool need_update;
41	int ret;
42
43	/* Update firmware */
44
45	s3fwrn5_set_wake(info, false);
46	s3fwrn5_set_mode(info, S3FWRN5_MODE_FW);
47
48	ret = s3fwrn5_fw_setup(&info->fw_info);
49	if (ret < 0)
50		return ret;
51
52	need_update = s3fwrn5_fw_check_version(&info->fw_info,
53		info->ndev->manufact_specific_info);
54	if (!need_update)
55		goto out;
56
57	dev_info(&info->ndev->nfc_dev->dev, "Detected new firmware version\n");
58
59	ret = s3fwrn5_fw_download(&info->fw_info);
60	if (ret < 0)
61		goto out;
62
63	/* Update RF configuration */
64
65	s3fwrn5_set_mode(info, S3FWRN5_MODE_NCI);
66
67	s3fwrn5_set_wake(info, true);
68	ret = s3fwrn5_nci_rf_configure(info, "sec_s3fwrn5_rfreg.bin");
69	s3fwrn5_set_wake(info, false);
70
71out:
72	s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
73	s3fwrn5_fw_cleanup(&info->fw_info);
74	return ret;
75}
76
77static int s3fwrn5_nci_open(struct nci_dev *ndev)
78{
79	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
80
81	if (s3fwrn5_get_mode(info) != S3FWRN5_MODE_COLD)
82		return  -EBUSY;
83
84	s3fwrn5_set_mode(info, S3FWRN5_MODE_NCI);
85	s3fwrn5_set_wake(info, true);
86
87	return 0;
88}
89
90static int s3fwrn5_nci_close(struct nci_dev *ndev)
91{
92	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
93
94	s3fwrn5_set_wake(info, false);
95	s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
96
97	return 0;
98}
99
100static int s3fwrn5_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
101{
102	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
103	int ret;
104
105	mutex_lock(&info->mutex);
106
107	if (s3fwrn5_get_mode(info) != S3FWRN5_MODE_NCI) {
108		kfree_skb(skb);
109		mutex_unlock(&info->mutex);
110		return -EINVAL;
111	}
112
113	ret = s3fwrn5_write(info, skb);
114	if (ret < 0) {
115		kfree_skb(skb);
116		mutex_unlock(&info->mutex);
117		return ret;
118	}
119
120	consume_skb(skb);
121	mutex_unlock(&info->mutex);
122	return 0;
123}
124
125static int s3fwrn5_nci_post_setup(struct nci_dev *ndev)
126{
127	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
128	int ret;
129
130	if (s3fwrn5_firmware_init(info)) {
131		//skip bootloader mode
132		return 0;
133	}
134
135	ret = s3fwrn5_firmware_update(info);
136	if (ret < 0)
137		return ret;
138
139	/* NCI core reset */
140
141	s3fwrn5_set_mode(info, S3FWRN5_MODE_NCI);
142	s3fwrn5_set_wake(info, true);
143
144	ret = nci_core_reset(info->ndev);
145	if (ret < 0)
146		return ret;
147
148	return nci_core_init(info->ndev);
149}
150
151static const struct nci_ops s3fwrn5_nci_ops = {
152	.open = s3fwrn5_nci_open,
153	.close = s3fwrn5_nci_close,
154	.send = s3fwrn5_nci_send,
155	.post_setup = s3fwrn5_nci_post_setup,
156	.prop_ops = s3fwrn5_nci_prop_ops,
157	.n_prop_ops = ARRAY_SIZE(s3fwrn5_nci_prop_ops),
158};
159
160int s3fwrn5_probe(struct nci_dev **ndev, void *phy_id, struct device *pdev,
161	const struct s3fwrn5_phy_ops *phy_ops)
162{
163	struct s3fwrn5_info *info;
164	int ret;
165
166	info = devm_kzalloc(pdev, sizeof(*info), GFP_KERNEL);
167	if (!info)
168		return -ENOMEM;
169
170	info->phy_id = phy_id;
171	info->pdev = pdev;
172	info->phy_ops = phy_ops;
173	mutex_init(&info->mutex);
174
175	s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
176
177	info->ndev = nci_allocate_device(&s3fwrn5_nci_ops,
178		S3FWRN5_NFC_PROTOCOLS, 0, 0);
179	if (!info->ndev)
180		return -ENOMEM;
181
182	nci_set_parent_dev(info->ndev, pdev);
183	nci_set_drvdata(info->ndev, info);
184
185	ret = nci_register_device(info->ndev);
186	if (ret < 0) {
187		nci_free_device(info->ndev);
188		return ret;
189	}
190
191	info->fw_info.ndev = info->ndev;
192
193	*ndev = info->ndev;
194
195	return ret;
196}
197EXPORT_SYMBOL(s3fwrn5_probe);
198
199void s3fwrn5_remove(struct nci_dev *ndev)
200{
201	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
202
203	s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
204
205	nci_unregister_device(ndev);
206	nci_free_device(ndev);
207}
208EXPORT_SYMBOL(s3fwrn5_remove);
209
210int s3fwrn5_recv_frame(struct nci_dev *ndev, struct sk_buff *skb,
211	enum s3fwrn5_mode mode)
212{
213	switch (mode) {
214	case S3FWRN5_MODE_NCI:
215		return nci_recv_frame(ndev, skb);
216	case S3FWRN5_MODE_FW:
217		return s3fwrn5_fw_recv_frame(ndev, skb);
218	default:
219		kfree_skb(skb);
220		return -ENODEV;
221	}
222}
223EXPORT_SYMBOL(s3fwrn5_recv_frame);
224
225MODULE_LICENSE("GPL");
226MODULE_DESCRIPTION("Samsung S3FWRN5 NFC driver");
227MODULE_AUTHOR("Robert Baldyga <r.baldyga@samsung.com>");
228