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/completion.h>
10 #include <linux/firmware.h>
11
12 #include "s3fwrn5.h"
13 #include "nci.h"
14
s3fwrn5_nci_prop_rsp(struct nci_dev * ndev,struct sk_buff * skb)15 static int s3fwrn5_nci_prop_rsp(struct nci_dev *ndev, struct sk_buff *skb)
16 {
17 __u8 status = skb->data[0];
18
19 nci_req_complete(ndev, status);
20 return 0;
21 }
22
23 static struct nci_driver_ops s3fwrn5_nci_prop_ops[] = {
24 {
25 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
26 NCI_PROP_AGAIN),
27 .rsp = s3fwrn5_nci_prop_rsp,
28 },
29 {
30 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
31 NCI_PROP_GET_RFREG),
32 .rsp = s3fwrn5_nci_prop_rsp,
33 },
34 {
35 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
36 NCI_PROP_SET_RFREG),
37 .rsp = s3fwrn5_nci_prop_rsp,
38 },
39 {
40 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
41 NCI_PROP_GET_RFREG_VER),
42 .rsp = s3fwrn5_nci_prop_rsp,
43 },
44 {
45 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
46 NCI_PROP_SET_RFREG_VER),
47 .rsp = s3fwrn5_nci_prop_rsp,
48 },
49 {
50 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
51 NCI_PROP_START_RFREG),
52 .rsp = s3fwrn5_nci_prop_rsp,
53 },
54 {
55 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
56 NCI_PROP_STOP_RFREG),
57 .rsp = s3fwrn5_nci_prop_rsp,
58 },
59 {
60 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
61 NCI_PROP_FW_CFG),
62 .rsp = s3fwrn5_nci_prop_rsp,
63 },
64 {
65 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
66 NCI_PROP_WR_RESET),
67 .rsp = s3fwrn5_nci_prop_rsp,
68 },
69 };
70
s3fwrn5_nci_get_prop_ops(struct nci_driver_ops ** ops,size_t * n)71 void s3fwrn5_nci_get_prop_ops(struct nci_driver_ops **ops, size_t *n)
72 {
73 *ops = s3fwrn5_nci_prop_ops;
74 *n = ARRAY_SIZE(s3fwrn5_nci_prop_ops);
75 }
76
77 #define S3FWRN5_RFREG_SECTION_SIZE 252
78
s3fwrn5_nci_rf_configure(struct s3fwrn5_info * info,const char * fw_name)79 int s3fwrn5_nci_rf_configure(struct s3fwrn5_info *info, const char *fw_name)
80 {
81 const struct firmware *fw;
82 struct nci_prop_fw_cfg_cmd fw_cfg;
83 struct nci_prop_set_rfreg_cmd set_rfreg;
84 struct nci_prop_stop_rfreg_cmd stop_rfreg;
85 u32 checksum;
86 int i, len;
87 int ret;
88
89 ret = request_firmware(&fw, fw_name, &info->ndev->nfc_dev->dev);
90 if (ret < 0)
91 return ret;
92
93 /* Compute rfreg checksum */
94
95 checksum = 0;
96 for (i = 0; i < fw->size; i += 4)
97 checksum += *((u32 *)(fw->data+i));
98
99 /* Set default clock configuration for external crystal */
100
101 fw_cfg.clk_type = 0x01;
102 fw_cfg.clk_speed = 0xff;
103 fw_cfg.clk_req = 0xff;
104 ret = nci_prop_cmd(info->ndev, NCI_PROP_FW_CFG,
105 sizeof(fw_cfg), (__u8 *)&fw_cfg);
106 if (ret < 0)
107 goto out;
108
109 /* Start rfreg configuration */
110
111 dev_info(&info->ndev->nfc_dev->dev,
112 "rfreg configuration update: %s\n", fw_name);
113
114 ret = nci_prop_cmd(info->ndev, NCI_PROP_START_RFREG, 0, NULL);
115 if (ret < 0) {
116 dev_err(&info->ndev->nfc_dev->dev,
117 "Unable to start rfreg update\n");
118 goto out;
119 }
120
121 /* Update rfreg */
122
123 set_rfreg.index = 0;
124 for (i = 0; i < fw->size; i += S3FWRN5_RFREG_SECTION_SIZE) {
125 len = (fw->size - i < S3FWRN5_RFREG_SECTION_SIZE) ?
126 (fw->size - i) : S3FWRN5_RFREG_SECTION_SIZE;
127 memcpy(set_rfreg.data, fw->data+i, len);
128 ret = nci_prop_cmd(info->ndev, NCI_PROP_SET_RFREG,
129 len+1, (__u8 *)&set_rfreg);
130 if (ret < 0) {
131 dev_err(&info->ndev->nfc_dev->dev,
132 "rfreg update error (code=%d)\n", ret);
133 goto out;
134 }
135 set_rfreg.index++;
136 }
137
138 /* Finish rfreg configuration */
139
140 stop_rfreg.checksum = checksum & 0xffff;
141 ret = nci_prop_cmd(info->ndev, NCI_PROP_STOP_RFREG,
142 sizeof(stop_rfreg), (__u8 *)&stop_rfreg);
143 if (ret < 0) {
144 dev_err(&info->ndev->nfc_dev->dev,
145 "Unable to stop rfreg update\n");
146 goto out;
147 }
148
149 dev_info(&info->ndev->nfc_dev->dev,
150 "rfreg configuration update: success\n");
151 out:
152 release_firmware(fw);
153 return ret;
154 }
155
