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
s3fwrn5_firmware_init(struct s3fwrn5_info * info)23 static 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
s3fwrn5_firmware_update(struct s3fwrn5_info * info)38 static 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
71 out:
72 s3fwrn5_set_mode(info, S3FWRN5_MODE_COLD);
73 s3fwrn5_fw_cleanup(&info->fw_info);
74 return ret;
75 }
76
s3fwrn5_nci_open(struct nci_dev * ndev)77 static 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
s3fwrn5_nci_close(struct nci_dev * ndev)90 static 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
s3fwrn5_nci_send(struct nci_dev * ndev,struct sk_buff * skb)100 static 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
s3fwrn5_nci_post_setup(struct nci_dev * ndev)125 static 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
151 static 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
s3fwrn5_probe(struct nci_dev ** ndev,void * phy_id,struct device * pdev,const struct s3fwrn5_phy_ops * phy_ops)160 int 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 }
197 EXPORT_SYMBOL(s3fwrn5_probe);
198
s3fwrn5_remove(struct nci_dev * ndev)199 void 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 }
208 EXPORT_SYMBOL(s3fwrn5_remove);
209
s3fwrn5_recv_frame(struct nci_dev * ndev,struct sk_buff * skb,enum s3fwrn5_mode mode)210 int 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 }
223 EXPORT_SYMBOL(s3fwrn5_recv_frame);
224
225 MODULE_LICENSE("GPL");
226 MODULE_DESCRIPTION("Samsung S3FWRN5 NFC driver");
227 MODULE_AUTHOR("Robert Baldyga <r.baldyga@samsung.com>");
228