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 static struct nci_driver_ops s3fwrn5_nci_prop_ops[] = {
  24         {
  25                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  26                                 NCI_PROP_AGAIN),
  27                 .rsp = s3fwrn5_nci_prop_rsp,
  28         },
  29         {
  30                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  31                                 NCI_PROP_GET_RFREG),
  32                 .rsp = s3fwrn5_nci_prop_rsp,
  33         },
  34         {
  35                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  36                                 NCI_PROP_SET_RFREG),
  37                 .rsp = s3fwrn5_nci_prop_rsp,
  38         },
  39         {
  40                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  41                                 NCI_PROP_GET_RFREG_VER),
  42                 .rsp = s3fwrn5_nci_prop_rsp,
  43         },
  44         {
  45                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  46                                 NCI_PROP_SET_RFREG_VER),
  47                 .rsp = s3fwrn5_nci_prop_rsp,
  48         },
  49         {
  50                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  51                                 NCI_PROP_START_RFREG),
  52                 .rsp = s3fwrn5_nci_prop_rsp,
  53         },
  54         {
  55                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  56                                 NCI_PROP_STOP_RFREG),
  57                 .rsp = s3fwrn5_nci_prop_rsp,
  58         },
  59         {
  60                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  61                                 NCI_PROP_FW_CFG),
  62                 .rsp = s3fwrn5_nci_prop_rsp,
  63         },
  64         {
  65                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  66                                 NCI_PROP_WR_RESET),
  67                 .rsp = s3fwrn5_nci_prop_rsp,
  68         },
  69 };
  70
  71 void s3fwrn5_nci_get_prop_ops(struct nci_driver_ops **ops, size_t *n)
  72 {
  73         *ops = s3fwrn5_nci_prop_ops;
  74         *n = ARRAY_SIZE(s3fwrn5_nci_prop_ops);
  75 }
  76
  77 #define S3FWRN5_RFREG_SECTION_SIZE 252
  78
  79 int s3fwrn5_nci_rf_configure(struct s3fwrn5_info *info, const char *fw_name)
  80 {
  81         const struct firmware *fw;
  82         struct nci_prop_fw_cfg_cmd fw_cfg;
  83         struct nci_prop_set_rfreg_cmd set_rfreg;
  84         struct nci_prop_stop_rfreg_cmd stop_rfreg;
  85         u32 checksum;
  86         int i, len;
  87         int ret;
  88
  89         ret = request_firmware(&fw, fw_name, &info->ndev->nfc_dev->dev);
  90         if (ret < 0)
  91                 return ret;
  92
  93         /* Compute rfreg checksum */
  94
  95         checksum = 0;
  96         for (i = 0; i < fw->size; i += 4)
  97                 checksum += *((u32 *)(fw->data+i));
  98
  99         /* Set default clock configuration for external crystal */
 100
 101         fw_cfg.clk_type = 0x01;
 102         fw_cfg.clk_speed = 0xff;
 103         fw_cfg.clk_req = 0xff;
 104         ret = nci_prop_cmd(info->ndev, NCI_PROP_FW_CFG,
 105                 sizeof(fw_cfg), (__u8 *)&fw_cfg);
 106         if (ret < 0)
 107                 goto out;
 108
 109         /* Start rfreg configuration */
 110
 111         dev_info(&info->ndev->nfc_dev->dev,
 112                 "rfreg configuration update: %s\n", fw_name);
 113
 114         ret = nci_prop_cmd(info->ndev, NCI_PROP_START_RFREG, 0, NULL);
 115         if (ret < 0) {
 116                 dev_err(&info->ndev->nfc_dev->dev,
 117                         "Unable to start rfreg update\n");
 118                 goto out;
 119         }
 120
 121         /* Update rfreg */
 122
 123         set_rfreg.index = 0;
 124         for (i = 0; i < fw->size; i += S3FWRN5_RFREG_SECTION_SIZE) {
 125                 len = (fw->size - i < S3FWRN5_RFREG_SECTION_SIZE) ?
 126                         (fw->size - i) : S3FWRN5_RFREG_SECTION_SIZE;
 127                 memcpy(set_rfreg.data, fw->data+i, len);
 128                 ret = nci_prop_cmd(info->ndev, NCI_PROP_SET_RFREG,
 129                         len+1, (__u8 *)&set_rfreg);
 130                 if (ret < 0) {
 131                         dev_err(&info->ndev->nfc_dev->dev,
 132                                 "rfreg update error (code=%d)\n", ret);
 133                         goto out;
 134                 }
 135                 set_rfreg.index++;
 136         }
 137
 138         /* Finish rfreg configuration */
 139
 140         stop_rfreg.checksum = checksum & 0xffff;
 141         ret = nci_prop_cmd(info->ndev, NCI_PROP_STOP_RFREG,
 142                 sizeof(stop_rfreg), (__u8 *)&stop_rfreg);
 143         if (ret < 0) {
 144                 dev_err(&info->ndev->nfc_dev->dev,
 145                         "Unable to stop rfreg update\n");
 146                 goto out;
 147         }
 148
 149         dev_info(&info->ndev->nfc_dev->dev,
 150                 "rfreg configuration update: success\n");
 151 out:
 152         release_firmware(fw);
 153         return ret;
 154 }