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_SET_RFREG),
27 .rsp = s3fwrn5_nci_prop_rsp,
28 },
29 {
30 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
31 NCI_PROP_START_RFREG),
32 .rsp = s3fwrn5_nci_prop_rsp,
33 },
34 {
35 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
36 NCI_PROP_STOP_RFREG),
37 .rsp = s3fwrn5_nci_prop_rsp,
38 },
39 {
40 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
41 NCI_PROP_FW_CFG),
42 .rsp = s3fwrn5_nci_prop_rsp,
43 },
44 };
45
s3fwrn5_nci_get_prop_ops(struct nci_driver_ops ** ops,size_t * n)46 void s3fwrn5_nci_get_prop_ops(struct nci_driver_ops **ops, size_t *n)
47 {
48 *ops = s3fwrn5_nci_prop_ops;
49 *n = ARRAY_SIZE(s3fwrn5_nci_prop_ops);
50 }
51
52 #define S3FWRN5_RFREG_SECTION_SIZE 252
53
s3fwrn5_nci_rf_configure(struct s3fwrn5_info * info,const char * fw_name)54 int s3fwrn5_nci_rf_configure(struct s3fwrn5_info *info, const char *fw_name)
55 {
56 const struct firmware *fw;
57 struct nci_prop_fw_cfg_cmd fw_cfg;
58 struct nci_prop_set_rfreg_cmd set_rfreg;
59 struct nci_prop_stop_rfreg_cmd stop_rfreg;
60 u32 checksum;
61 int i, len;
62 int ret;
63
64 ret = request_firmware(&fw, fw_name, &info->ndev->nfc_dev->dev);
65 if (ret < 0)
66 return ret;
67
68 /* Compute rfreg checksum */
69
70 checksum = 0;
71 for (i = 0; i < fw->size; i += 4)
72 checksum += *((u32 *)(fw->data+i));
73
74 /* Set default clock configuration for external crystal */
75
76 fw_cfg.clk_type = 0x01;
77 fw_cfg.clk_speed = 0xff;
78 fw_cfg.clk_req = 0xff;
79 ret = nci_prop_cmd(info->ndev, NCI_PROP_FW_CFG,
80 sizeof(fw_cfg), (__u8 *)&fw_cfg);
81 if (ret < 0)
82 goto out;
83
84 /* Start rfreg configuration */
85
86 dev_info(&info->ndev->nfc_dev->dev,
87 "rfreg configuration update: %s\n", fw_name);
88
89 ret = nci_prop_cmd(info->ndev, NCI_PROP_START_RFREG, 0, NULL);
90 if (ret < 0) {
91 dev_err(&info->ndev->nfc_dev->dev,
92 "Unable to start rfreg update\n");
93 goto out;
94 }
95
96 /* Update rfreg */
97
98 set_rfreg.index = 0;
99 for (i = 0; i < fw->size; i += S3FWRN5_RFREG_SECTION_SIZE) {
100 len = (fw->size - i < S3FWRN5_RFREG_SECTION_SIZE) ?
101 (fw->size - i) : S3FWRN5_RFREG_SECTION_SIZE;
102 memcpy(set_rfreg.data, fw->data+i, len);
103 ret = nci_prop_cmd(info->ndev, NCI_PROP_SET_RFREG,
104 len+1, (__u8 *)&set_rfreg);
105 if (ret < 0) {
106 dev_err(&info->ndev->nfc_dev->dev,
107 "rfreg update error (code=%d)\n", ret);
108 goto out;
109 }
110 set_rfreg.index++;
111 }
112
113 /* Finish rfreg configuration */
114
115 stop_rfreg.checksum = checksum & 0xffff;
116 ret = nci_prop_cmd(info->ndev, NCI_PROP_STOP_RFREG,
117 sizeof(stop_rfreg), (__u8 *)&stop_rfreg);
118 if (ret < 0) {
119 dev_err(&info->ndev->nfc_dev->dev,
120 "Unable to stop rfreg update\n");
121 goto out;
122 }
123
124 dev_info(&info->ndev->nfc_dev->dev,
125 "rfreg configuration update: success\n");
126 out:
127 release_firmware(fw);
128 return ret;
129 }
130