LXR linux/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
  26static 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
  34static 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
  82void 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
  90int 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");
 162out:
 163        release_firmware(fw);
 164        return ret;
 165}
 166