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