linux/drivers/nfc/s3fwrn5/nci.c
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   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
  15static 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
  23static 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
  46void 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
  54int 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");
 126out:
 127        release_firmware(fw);
 128        return ret;
 129}
 130