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![Samuel Ortiz](/assets/img/avatar_default.png)
Some devices (e.g. Sony's PaSoRi) can not do type B polling, so we have to make a distinction between ISO14443 type A and B poll modes. Cc: Eric Lapuyade <eric.lapuyade@intel.com> Cc: Ilan Elias <ilane@ti.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
627 lines
14 KiB
C
627 lines
14 KiB
C
/*
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* Texas Instrument's NFC Driver For Shared Transport.
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*
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* NFC Driver acts as interface between NCI core and
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* TI Shared Transport Layer.
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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*
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* Written by Ilan Elias <ilane@ti.com>
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*
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* Acknowledgements:
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* This file is based on btwilink.c, which was written
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* by Raja Mani and Pavan Savoy.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/firmware.h>
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#include <linux/nfc.h>
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#include <net/nfc/nci.h>
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#include <net/nfc/nci_core.h>
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#include <linux/ti_wilink_st.h>
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#define NFCWILINK_CHNL 12
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#define NFCWILINK_OPCODE 7
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#define NFCWILINK_MAX_FRAME_SIZE 300
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#define NFCWILINK_HDR_LEN 4
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#define NFCWILINK_OFFSET_LEN_IN_HDR 1
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#define NFCWILINK_LEN_SIZE 2
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#define NFCWILINK_REGISTER_TIMEOUT 8000 /* 8 sec */
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#define NFCWILINK_CMD_TIMEOUT 5000 /* 5 sec */
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#define BTS_FILE_NAME_MAX_SIZE 40
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#define BTS_FILE_HDR_MAGIC 0x42535442
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#define BTS_FILE_CMD_MAX_LEN 0xff
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#define BTS_FILE_ACTION_TYPE_SEND_CMD 1
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#define NCI_VS_NFCC_INFO_CMD_GID 0x2f
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#define NCI_VS_NFCC_INFO_CMD_OID 0x12
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#define NCI_VS_NFCC_INFO_RSP_GID 0x4f
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#define NCI_VS_NFCC_INFO_RSP_OID 0x12
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struct nfcwilink_hdr {
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__u8 chnl;
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__u8 opcode;
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__le16 len;
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} __packed;
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struct nci_vs_nfcc_info_cmd {
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__u8 gid;
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__u8 oid;
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__u8 plen;
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} __packed;
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struct nci_vs_nfcc_info_rsp {
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__u8 gid;
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__u8 oid;
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__u8 plen;
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__u8 status;
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__u8 hw_id;
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__u8 sw_ver_x;
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__u8 sw_ver_z;
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__u8 patch_id;
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} __packed;
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struct bts_file_hdr {
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__le32 magic;
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__le32 ver;
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__u8 rfu[24];
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__u8 actions[0];
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} __packed;
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struct bts_file_action {
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__le16 type;
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__le16 len;
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__u8 data[0];
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} __packed;
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struct nfcwilink {
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struct platform_device *pdev;
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struct nci_dev *ndev;
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unsigned long flags;
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char st_register_cb_status;
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long (*st_write) (struct sk_buff *);
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struct completion completed;
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struct nci_vs_nfcc_info_rsp nfcc_info;
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};
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/* NFCWILINK driver flags */
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enum {
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NFCWILINK_RUNNING,
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NFCWILINK_FW_DOWNLOAD,
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};
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static int nfcwilink_send(struct sk_buff *skb);
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static inline struct sk_buff *nfcwilink_skb_alloc(unsigned int len, gfp_t how)
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{
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struct sk_buff *skb;
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skb = alloc_skb(len + NFCWILINK_HDR_LEN, how);
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if (skb)
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skb_reserve(skb, NFCWILINK_HDR_LEN);
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return skb;
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}
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static void nfcwilink_fw_download_receive(struct nfcwilink *drv,
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struct sk_buff *skb)
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{
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struct nci_vs_nfcc_info_rsp *rsp = (void *)skb->data;
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/* Detect NCI_VS_NFCC_INFO_RSP and store the result */
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if ((skb->len > 3) && (rsp->gid == NCI_VS_NFCC_INFO_RSP_GID) &&
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(rsp->oid == NCI_VS_NFCC_INFO_RSP_OID)) {
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memcpy(&drv->nfcc_info, rsp,
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sizeof(struct nci_vs_nfcc_info_rsp));
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}
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kfree_skb(skb);
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complete(&drv->completed);
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}
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static int nfcwilink_get_bts_file_name(struct nfcwilink *drv, char *file_name)
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{
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struct nci_vs_nfcc_info_cmd *cmd;
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struct sk_buff *skb;
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unsigned long comp_ret;
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int rc;
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nfc_dev_dbg(&drv->pdev->dev, "get_bts_file_name entry");
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skb = nfcwilink_skb_alloc(sizeof(struct nci_vs_nfcc_info_cmd),
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GFP_KERNEL);
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if (!skb) {
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nfc_dev_err(&drv->pdev->dev,
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"no memory for nci_vs_nfcc_info_cmd");
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return -ENOMEM;
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}
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skb->dev = (void *)drv->ndev;
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cmd = (struct nci_vs_nfcc_info_cmd *)
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skb_put(skb, sizeof(struct nci_vs_nfcc_info_cmd));
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cmd->gid = NCI_VS_NFCC_INFO_CMD_GID;
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cmd->oid = NCI_VS_NFCC_INFO_CMD_OID;
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cmd->plen = 0;
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drv->nfcc_info.plen = 0;
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rc = nfcwilink_send(skb);
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if (rc)
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return rc;
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comp_ret = wait_for_completion_timeout(&drv->completed,
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msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
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nfc_dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld",
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comp_ret);
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if (comp_ret == 0) {
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nfc_dev_err(&drv->pdev->dev,
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"timeout on wait_for_completion_timeout");
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return -ETIMEDOUT;
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}
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nfc_dev_dbg(&drv->pdev->dev, "nci_vs_nfcc_info_rsp: plen %d, status %d",
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drv->nfcc_info.plen,
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drv->nfcc_info.status);
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if ((drv->nfcc_info.plen != 5) || (drv->nfcc_info.status != 0)) {
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nfc_dev_err(&drv->pdev->dev,
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"invalid nci_vs_nfcc_info_rsp");
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return -EINVAL;
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}
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snprintf(file_name, BTS_FILE_NAME_MAX_SIZE,
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"TINfcInit_%d.%d.%d.%d.bts",
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drv->nfcc_info.hw_id,
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drv->nfcc_info.sw_ver_x,
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drv->nfcc_info.sw_ver_z,
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drv->nfcc_info.patch_id);
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nfc_dev_info(&drv->pdev->dev, "nfcwilink FW file name: %s", file_name);
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return 0;
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}
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static int nfcwilink_send_bts_cmd(struct nfcwilink *drv, __u8 *data, int len)
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{
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struct nfcwilink_hdr *hdr = (struct nfcwilink_hdr *)data;
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struct sk_buff *skb;
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unsigned long comp_ret;
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int rc;
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nfc_dev_dbg(&drv->pdev->dev, "send_bts_cmd entry");
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/* verify valid cmd for the NFC channel */
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if ((len <= sizeof(struct nfcwilink_hdr)) ||
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(len > BTS_FILE_CMD_MAX_LEN) ||
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(hdr->chnl != NFCWILINK_CHNL) ||
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(hdr->opcode != NFCWILINK_OPCODE)) {
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nfc_dev_err(&drv->pdev->dev,
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"ignoring invalid bts cmd, len %d, chnl %d, opcode %d",
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len, hdr->chnl, hdr->opcode);
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return 0;
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}
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/* remove the ST header */
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len -= sizeof(struct nfcwilink_hdr);
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data += sizeof(struct nfcwilink_hdr);
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skb = nfcwilink_skb_alloc(len, GFP_KERNEL);
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if (!skb) {
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nfc_dev_err(&drv->pdev->dev, "no memory for bts cmd");
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return -ENOMEM;
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}
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skb->dev = (void *)drv->ndev;
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memcpy(skb_put(skb, len), data, len);
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rc = nfcwilink_send(skb);
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if (rc)
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return rc;
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comp_ret = wait_for_completion_timeout(&drv->completed,
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msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
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nfc_dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld",
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comp_ret);
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if (comp_ret == 0) {
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nfc_dev_err(&drv->pdev->dev,
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"timeout on wait_for_completion_timeout");
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return -ETIMEDOUT;
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}
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return 0;
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}
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static int nfcwilink_download_fw(struct nfcwilink *drv)
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{
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unsigned char file_name[BTS_FILE_NAME_MAX_SIZE];
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const struct firmware *fw;
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__u16 action_type, action_len;
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__u8 *ptr;
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int len, rc;
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nfc_dev_dbg(&drv->pdev->dev, "download_fw entry");
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set_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
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rc = nfcwilink_get_bts_file_name(drv, file_name);
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if (rc)
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goto exit;
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rc = request_firmware(&fw, file_name, &drv->pdev->dev);
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if (rc) {
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nfc_dev_err(&drv->pdev->dev, "request_firmware failed %d", rc);
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/* if the file is not found, don't exit with failure */
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if (rc == -ENOENT)
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rc = 0;
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goto exit;
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}
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len = fw->size;
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ptr = (__u8 *)fw->data;
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if ((len == 0) || (ptr == NULL)) {
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nfc_dev_dbg(&drv->pdev->dev,
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"request_firmware returned size %d", len);
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goto release_fw;
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}
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if (__le32_to_cpu(((struct bts_file_hdr *)ptr)->magic) !=
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BTS_FILE_HDR_MAGIC) {
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nfc_dev_err(&drv->pdev->dev, "wrong bts magic number");
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rc = -EINVAL;
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goto release_fw;
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}
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/* remove the BTS header */
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len -= sizeof(struct bts_file_hdr);
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ptr += sizeof(struct bts_file_hdr);
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while (len > 0) {
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action_type =
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__le16_to_cpu(((struct bts_file_action *)ptr)->type);
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action_len =
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__le16_to_cpu(((struct bts_file_action *)ptr)->len);
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nfc_dev_dbg(&drv->pdev->dev, "bts_file_action type %d, len %d",
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action_type, action_len);
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switch (action_type) {
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case BTS_FILE_ACTION_TYPE_SEND_CMD:
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rc = nfcwilink_send_bts_cmd(drv,
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((struct bts_file_action *)ptr)->data,
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action_len);
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if (rc)
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goto release_fw;
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break;
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}
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/* advance to the next action */
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len -= (sizeof(struct bts_file_action) + action_len);
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ptr += (sizeof(struct bts_file_action) + action_len);
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}
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release_fw:
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release_firmware(fw);
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exit:
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clear_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
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return rc;
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}
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/* Called by ST when registration is complete */
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static void nfcwilink_register_complete(void *priv_data, char data)
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{
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struct nfcwilink *drv = priv_data;
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nfc_dev_dbg(&drv->pdev->dev, "register_complete entry");
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/* store ST registration status */
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drv->st_register_cb_status = data;
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/* complete the wait in nfc_st_open() */
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complete(&drv->completed);
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}
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/* Called by ST when receive data is available */
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static long nfcwilink_receive(void *priv_data, struct sk_buff *skb)
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{
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struct nfcwilink *drv = priv_data;
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int rc;
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nfc_dev_dbg(&drv->pdev->dev, "receive entry, len %d", skb->len);
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if (!skb)
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return -EFAULT;
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if (!drv) {
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kfree_skb(skb);
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return -EFAULT;
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}
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/* strip the ST header
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(apart for the chnl byte, which is not received in the hdr) */
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skb_pull(skb, (NFCWILINK_HDR_LEN-1));
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if (test_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags)) {
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nfcwilink_fw_download_receive(drv, skb);
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return 0;
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}
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skb->dev = (void *) drv->ndev;
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/* Forward skb to NCI core layer */
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rc = nci_recv_frame(skb);
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if (rc < 0) {
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nfc_dev_err(&drv->pdev->dev, "nci_recv_frame failed %d", rc);
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return rc;
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}
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return 0;
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}
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/* protocol structure registered with ST */
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static struct st_proto_s nfcwilink_proto = {
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.chnl_id = NFCWILINK_CHNL,
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.max_frame_size = NFCWILINK_MAX_FRAME_SIZE,
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.hdr_len = (NFCWILINK_HDR_LEN-1), /* not including chnl byte */
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.offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR,
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.len_size = NFCWILINK_LEN_SIZE,
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.reserve = 0,
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.recv = nfcwilink_receive,
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.reg_complete_cb = nfcwilink_register_complete,
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.write = NULL,
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};
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static int nfcwilink_open(struct nci_dev *ndev)
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{
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struct nfcwilink *drv = nci_get_drvdata(ndev);
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unsigned long comp_ret;
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int rc;
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nfc_dev_dbg(&drv->pdev->dev, "open entry");
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if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) {
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rc = -EBUSY;
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goto exit;
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}
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nfcwilink_proto.priv_data = drv;
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init_completion(&drv->completed);
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drv->st_register_cb_status = -EINPROGRESS;
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rc = st_register(&nfcwilink_proto);
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if (rc < 0) {
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if (rc == -EINPROGRESS) {
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comp_ret = wait_for_completion_timeout(
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&drv->completed,
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msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT));
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nfc_dev_dbg(&drv->pdev->dev,
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"wait_for_completion_timeout returned %ld",
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comp_ret);
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if (comp_ret == 0) {
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/* timeout */
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rc = -ETIMEDOUT;
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goto clear_exit;
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} else if (drv->st_register_cb_status != 0) {
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rc = drv->st_register_cb_status;
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nfc_dev_err(&drv->pdev->dev,
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"st_register_cb failed %d", rc);
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goto clear_exit;
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}
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} else {
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nfc_dev_err(&drv->pdev->dev,
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"st_register failed %d", rc);
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goto clear_exit;
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}
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}
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/* st_register MUST fill the write callback */
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BUG_ON(nfcwilink_proto.write == NULL);
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drv->st_write = nfcwilink_proto.write;
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if (nfcwilink_download_fw(drv)) {
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nfc_dev_err(&drv->pdev->dev, "nfcwilink_download_fw failed %d",
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rc);
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/* open should succeed, even if the FW download failed */
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}
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goto exit;
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clear_exit:
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clear_bit(NFCWILINK_RUNNING, &drv->flags);
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exit:
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return rc;
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}
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static int nfcwilink_close(struct nci_dev *ndev)
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{
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struct nfcwilink *drv = nci_get_drvdata(ndev);
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int rc;
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nfc_dev_dbg(&drv->pdev->dev, "close entry");
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if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags))
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return 0;
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rc = st_unregister(&nfcwilink_proto);
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if (rc)
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nfc_dev_err(&drv->pdev->dev, "st_unregister failed %d", rc);
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drv->st_write = NULL;
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return rc;
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}
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static int nfcwilink_send(struct sk_buff *skb)
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{
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struct nci_dev *ndev = (struct nci_dev *)skb->dev;
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struct nfcwilink *drv = nci_get_drvdata(ndev);
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struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
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long len;
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nfc_dev_dbg(&drv->pdev->dev, "send entry, len %d", skb->len);
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if (!test_bit(NFCWILINK_RUNNING, &drv->flags)) {
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kfree_skb(skb);
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return -EINVAL;
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}
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/* add the ST hdr to the start of the buffer */
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hdr.len = cpu_to_le16(skb->len);
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memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN);
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/* Insert skb to shared transport layer's transmit queue.
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* Freeing skb memory is taken care in shared transport layer,
|
|
* so don't free skb memory here.
|
|
*/
|
|
len = drv->st_write(skb);
|
|
if (len < 0) {
|
|
kfree_skb(skb);
|
|
nfc_dev_err(&drv->pdev->dev, "st_write failed %ld", len);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nci_ops nfcwilink_ops = {
|
|
.open = nfcwilink_open,
|
|
.close = nfcwilink_close,
|
|
.send = nfcwilink_send,
|
|
};
|
|
|
|
static int nfcwilink_probe(struct platform_device *pdev)
|
|
{
|
|
static struct nfcwilink *drv;
|
|
int rc;
|
|
__u32 protocols;
|
|
|
|
nfc_dev_dbg(&pdev->dev, "probe entry");
|
|
|
|
drv = kzalloc(sizeof(struct nfcwilink), GFP_KERNEL);
|
|
if (!drv) {
|
|
rc = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
drv->pdev = pdev;
|
|
|
|
protocols = NFC_PROTO_JEWEL_MASK
|
|
| NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
|
|
| NFC_PROTO_ISO14443_MASK
|
|
| NFC_PROTO_ISO14443_B_MASK
|
|
| NFC_PROTO_NFC_DEP_MASK;
|
|
|
|
drv->ndev = nci_allocate_device(&nfcwilink_ops,
|
|
protocols,
|
|
NFCWILINK_HDR_LEN,
|
|
0);
|
|
if (!drv->ndev) {
|
|
nfc_dev_err(&pdev->dev, "nci_allocate_device failed");
|
|
rc = -ENOMEM;
|
|
goto free_exit;
|
|
}
|
|
|
|
nci_set_parent_dev(drv->ndev, &pdev->dev);
|
|
nci_set_drvdata(drv->ndev, drv);
|
|
|
|
rc = nci_register_device(drv->ndev);
|
|
if (rc < 0) {
|
|
nfc_dev_err(&pdev->dev, "nci_register_device failed %d", rc);
|
|
goto free_dev_exit;
|
|
}
|
|
|
|
dev_set_drvdata(&pdev->dev, drv);
|
|
|
|
goto exit;
|
|
|
|
free_dev_exit:
|
|
nci_free_device(drv->ndev);
|
|
|
|
free_exit:
|
|
kfree(drv);
|
|
|
|
exit:
|
|
return rc;
|
|
}
|
|
|
|
static int nfcwilink_remove(struct platform_device *pdev)
|
|
{
|
|
struct nfcwilink *drv = dev_get_drvdata(&pdev->dev);
|
|
struct nci_dev *ndev;
|
|
|
|
nfc_dev_dbg(&pdev->dev, "remove entry");
|
|
|
|
if (!drv)
|
|
return -EFAULT;
|
|
|
|
ndev = drv->ndev;
|
|
|
|
nci_unregister_device(ndev);
|
|
nci_free_device(ndev);
|
|
|
|
kfree(drv);
|
|
|
|
dev_set_drvdata(&pdev->dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver nfcwilink_driver = {
|
|
.probe = nfcwilink_probe,
|
|
.remove = nfcwilink_remove,
|
|
.driver = {
|
|
.name = "nfcwilink",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
/* ------- Module Init/Exit interfaces ------ */
|
|
static int __init nfcwilink_init(void)
|
|
{
|
|
printk(KERN_INFO "NFC Driver for TI WiLink");
|
|
|
|
return platform_driver_register(&nfcwilink_driver);
|
|
}
|
|
|
|
static void __exit nfcwilink_exit(void)
|
|
{
|
|
platform_driver_unregister(&nfcwilink_driver);
|
|
}
|
|
|
|
module_init(nfcwilink_init);
|
|
module_exit(nfcwilink_exit);
|
|
|
|
/* ------ Module Info ------ */
|
|
|
|
MODULE_AUTHOR("Ilan Elias <ilane@ti.com>");
|
|
MODULE_DESCRIPTION("NFC Driver for TI Shared Transport");
|
|
MODULE_LICENSE("GPL");
|