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 <[email protected]>
   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 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
  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
  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 }