drivers/nfc/s3fwrn5/nci.c

   1 /*
   2  * NCI based driver for Samsung S3FWRN5 NFC chip
   3  *
   4  * Copyright (C) 2015 Samsung Electrnoics
   5  * Robert Baldyga <r.baldyga@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2 or later, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/completion.h>
  21 #include <linux/firmware.h>
  22
  23 #include "s3fwrn5.h"
  24 #include "nci.h"
  25
  26 static int s3fwrn5_nci_prop_rsp(struct nci_dev *ndev, struct sk_buff *skb)
  27 {
  28         __u8 status = skb->data[0];
  29
  30         nci_req_complete(ndev, status);
  31         return 0;
  32 }
  33
  34 static struct nci_driver_ops s3fwrn5_nci_prop_ops[] = {
  35         {
  36                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  37                                 NCI_PROP_AGAIN),
  38                 .rsp = s3fwrn5_nci_prop_rsp,
  39         },
  40         {
  41                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  42                                 NCI_PROP_GET_RFREG),
  43                 .rsp = s3fwrn5_nci_prop_rsp,
  44         },
  45         {
  46                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  47                                 NCI_PROP_SET_RFREG),
  48                 .rsp = s3fwrn5_nci_prop_rsp,
  49         },
  50         {
  51                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  52                                 NCI_PROP_GET_RFREG_VER),
  53                 .rsp = s3fwrn5_nci_prop_rsp,
  54         },
  55         {
  56                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  57                                 NCI_PROP_SET_RFREG_VER),
  58                 .rsp = s3fwrn5_nci_prop_rsp,
  59         },
  60         {
  61                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  62                                 NCI_PROP_START_RFREG),
  63                 .rsp = s3fwrn5_nci_prop_rsp,
  64         },
  65         {
  66                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  67                                 NCI_PROP_STOP_RFREG),
  68                 .rsp = s3fwrn5_nci_prop_rsp,
  69         },
  70         {
  71                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  72                                 NCI_PROP_FW_CFG),
  73                 .rsp = s3fwrn5_nci_prop_rsp,
  74         },
  75         {
  76                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
  77                                 NCI_PROP_WR_RESET),
  78                 .rsp = s3fwrn5_nci_prop_rsp,
  79         },
  80 };
  81
  82 void s3fwrn5_nci_get_prop_ops(struct nci_driver_ops **ops, size_t *n)
  83 {
  84         *ops = s3fwrn5_nci_prop_ops;
  85         *n = ARRAY_SIZE(s3fwrn5_nci_prop_ops);
  86 }
  87
  88 #define S3FWRN5_RFREG_SECTION_SIZE 252
  89
  90 int s3fwrn5_nci_rf_configure(struct s3fwrn5_info *info, const char *fw_name)
  91 {
  92         const struct firmware *fw;
  93         struct nci_prop_fw_cfg_cmd fw_cfg;
  94         struct nci_prop_set_rfreg_cmd set_rfreg;
  95         struct nci_prop_stop_rfreg_cmd stop_rfreg;
  96         u32 checksum;
  97         int i, len;
  98         int ret;
  99
 100         ret = request_firmware(&fw, fw_name, &info->ndev->nfc_dev->dev);
 101         if (ret < 0)
 102                 return ret;
 103
 104         /* Compute rfreg checksum */
 105
 106         checksum = 0;
 107         for (i = 0; i < fw->size; i += 4)
 108                 checksum += *((u32 *)(fw->data+i));
 109
 110         /* Set default clock configuration for external crystal */
 111
 112         fw_cfg.clk_type = 0x01;
 113         fw_cfg.clk_speed = 0xff;
 114         fw_cfg.clk_req = 0xff;
 115         ret = nci_prop_cmd(info->ndev, NCI_PROP_FW_CFG,
 116                 sizeof(fw_cfg), (__u8 *)&fw_cfg);
 117         if (ret < 0)
 118                 goto out;
 119
 120         /* Start rfreg configuration */
 121
 122         dev_info(&info->ndev->nfc_dev->dev,
 123                 "rfreg configuration update: %s\n", fw_name);
 124
 125         ret = nci_prop_cmd(info->ndev, NCI_PROP_START_RFREG, 0, NULL);
 126         if (ret < 0) {
 127                 dev_err(&info->ndev->nfc_dev->dev,
 128                         "Unable to start rfreg update\n");
 129                 goto out;
 130         }
 131
 132         /* Update rfreg */
 133
 134         set_rfreg.index = 0;
 135         for (i = 0; i < fw->size; i += S3FWRN5_RFREG_SECTION_SIZE) {
 136                 len = (fw->size - i < S3FWRN5_RFREG_SECTION_SIZE) ?
 137                         (fw->size - i) : S3FWRN5_RFREG_SECTION_SIZE;
 138                 memcpy(set_rfreg.data, fw->data+i, len);
 139                 ret = nci_prop_cmd(info->ndev, NCI_PROP_SET_RFREG,
 140                         len+1, (__u8 *)&set_rfreg);
 141                 if (ret < 0) {
 142                         dev_err(&info->ndev->nfc_dev->dev,
 143                                 "rfreg update error (code=%d)\n", ret);
 144                         goto out;
 145                 }
 146                 set_rfreg.index++;
 147         }
 148
 149         /* Finish rfreg configuration */
 150
 151         stop_rfreg.checksum = checksum & 0xffff;
 152         ret = nci_prop_cmd(info->ndev, NCI_PROP_STOP_RFREG,
 153                 sizeof(stop_rfreg), (__u8 *)&stop_rfreg);
 154         if (ret < 0) {
 155                 dev_err(&info->ndev->nfc_dev->dev,
 156                         "Unable to stop rfreg update\n");
 157                 goto out;
 158         }
 159
 160         dev_info(&info->ndev->nfc_dev->dev,
 161                 "rfreg configuration update: success\n");
 162 out:
 163         release_firmware(fw);
 164         return ret;
 165 }