drivers/nfc/s3fwrn5/nci.c

   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
  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
  48 int s3fwrn5_nci_rf_configure(struct s3fwrn5_info *info, const char *fw_name)
  49 {
  50         const struct firmware *fw;
  51         struct nci_prop_fw_cfg_cmd fw_cfg;
  52         struct nci_prop_set_rfreg_cmd set_rfreg;
  53         struct nci_prop_stop_rfreg_cmd stop_rfreg;
  54         u32 checksum;
  55         int i, len;
  56         int ret;
  57
  58         ret = request_firmware(&fw, fw_name, &info->ndev->nfc_dev->dev);
  59         if (ret < 0)
  60                 return ret;
  61
  62         /* Compute rfreg checksum */
  63
  64         checksum = 0;
  65         for (i = 0; i < fw->size; i += 4)
  66                 checksum += *((u32 *)(fw->data+i));
  67
  68         /* Set default clock configuration for external crystal */
  69
  70         fw_cfg.clk_type = 0x01;
  71         fw_cfg.clk_speed = 0xff;
  72         fw_cfg.clk_req = 0xff;
  73         ret = nci_prop_cmd(info->ndev, NCI_PROP_FW_CFG,
  74                 sizeof(fw_cfg), (__u8 *)&fw_cfg);
  75         if (ret < 0)
  76                 goto out;
  77
  78         /* Start rfreg configuration */
  79
  80         dev_info(&info->ndev->nfc_dev->dev,
  81                 "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(&info->ndev->nfc_dev->dev,
  86                         "Unable to start rfreg update\n");
  87                 goto out;
  88         }
  89
  90         /* Update rfreg */
  91
  92         set_rfreg.index = 0;
  93         for (i = 0; i < fw->size; i += S3FWRN5_RFREG_SECTION_SIZE) {
  94                 len = (fw->size - i < S3FWRN5_RFREG_SECTION_SIZE) ?
  95                         (fw->size - i) : S3FWRN5_RFREG_SECTION_SIZE;
  96                 memcpy(set_rfreg.data, fw->data+i, len);
  97                 ret = nci_prop_cmd(info->ndev, NCI_PROP_SET_RFREG,
  98                         len+1, (__u8 *)&set_rfreg);
  99                 if (ret < 0) {
 100                         dev_err(&info->ndev->nfc_dev->dev,
 101                                 "rfreg update error (code=%d)\n", ret);
 102                         goto out;
 103                 }
 104                 set_rfreg.index++;
 105         }
 106
 107         /* Finish rfreg configuration */
 108
 109         stop_rfreg.checksum = checksum & 0xffff;
 110         ret = nci_prop_cmd(info->ndev, NCI_PROP_STOP_RFREG,
 111                 sizeof(stop_rfreg), (__u8 *)&stop_rfreg);
 112         if (ret < 0) {
 113                 dev_err(&info->ndev->nfc_dev->dev,
 114                         "Unable to stop rfreg update\n");
 115                 goto out;
 116         }
 117
 118         dev_info(&info->ndev->nfc_dev->dev,
 119                 "rfreg configuration update: success\n");
 120 out:
 121         release_firmware(fw);
 122         return ret;
 123 }