416 lines
8.3 KiB
C
416 lines
8.3 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2003-2013, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/mei_cl_bus.h>
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#include "mei_dev.h"
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#include "client.h"
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struct mei_nfc_cmd {
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u8 command;
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u8 status;
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u16 req_id;
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u32 reserved;
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u16 data_size;
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u8 sub_command;
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u8 data[];
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} __packed;
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struct mei_nfc_reply {
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u8 command;
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u8 status;
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u16 req_id;
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u32 reserved;
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u16 data_size;
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u8 sub_command;
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u8 reply_status;
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u8 data[];
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} __packed;
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struct mei_nfc_if_version {
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u8 radio_version_sw[3];
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u8 reserved[3];
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u8 radio_version_hw[3];
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u8 i2c_addr;
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u8 fw_ivn;
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u8 vendor_id;
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u8 radio_type;
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} __packed;
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struct mei_nfc_connect {
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u8 fw_ivn;
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u8 vendor_id;
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} __packed;
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struct mei_nfc_connect_resp {
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u8 fw_ivn;
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u8 vendor_id;
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u16 me_major;
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u16 me_minor;
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u16 me_hotfix;
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u16 me_build;
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} __packed;
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struct mei_nfc_hci_hdr {
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u8 cmd;
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u8 status;
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u16 req_id;
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u32 reserved;
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u16 data_size;
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} __packed;
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#define MEI_NFC_CMD_MAINTENANCE 0x00
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#define MEI_NFC_CMD_HCI_SEND 0x01
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#define MEI_NFC_CMD_HCI_RECV 0x02
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#define MEI_NFC_SUBCMD_CONNECT 0x00
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#define MEI_NFC_SUBCMD_IF_VERSION 0x01
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#define MEI_NFC_HEADER_SIZE 10
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/**
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* struct mei_nfc_dev - NFC mei device
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*
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* @me_cl: NFC me client
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* @cl: NFC host client
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* @cl_info: NFC info host client
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* @init_work: perform connection to the info client
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* @fw_ivn: NFC Interface Version Number
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* @vendor_id: NFC manufacturer ID
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* @radio_type: NFC radio type
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* @bus_name: bus name
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*
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*/
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struct mei_nfc_dev {
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struct mei_me_client *me_cl;
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struct mei_cl *cl;
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struct mei_cl *cl_info;
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struct work_struct init_work;
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u8 fw_ivn;
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u8 vendor_id;
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u8 radio_type;
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char *bus_name;
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};
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/* UUIDs for NFC F/W clients */
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const uuid_le mei_nfc_guid = UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50,
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0x94, 0xd4, 0x50, 0x26,
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0x67, 0x23, 0x77, 0x5c);
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static const uuid_le mei_nfc_info_guid = UUID_LE(0xd2de1625, 0x382d, 0x417d,
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0x48, 0xa4, 0xef, 0xab,
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0xba, 0x8a, 0x12, 0x06);
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/* Vendors */
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#define MEI_NFC_VENDOR_INSIDE 0x00
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#define MEI_NFC_VENDOR_NXP 0x01
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/* Radio types */
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#define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
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#define MEI_NFC_VENDOR_NXP_PN544 0x01
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static void mei_nfc_free(struct mei_nfc_dev *ndev)
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{
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if (!ndev)
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return;
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if (ndev->cl) {
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list_del(&ndev->cl->device_link);
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mei_cl_unlink(ndev->cl);
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kfree(ndev->cl);
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}
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if (ndev->cl_info) {
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list_del(&ndev->cl_info->device_link);
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mei_cl_unlink(ndev->cl_info);
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kfree(ndev->cl_info);
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}
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mei_me_cl_put(ndev->me_cl);
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kfree(ndev);
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}
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static int mei_nfc_build_bus_name(struct mei_nfc_dev *ndev)
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{
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struct mei_device *dev;
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if (!ndev->cl)
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return -ENODEV;
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dev = ndev->cl->dev;
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switch (ndev->vendor_id) {
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case MEI_NFC_VENDOR_INSIDE:
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switch (ndev->radio_type) {
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case MEI_NFC_VENDOR_INSIDE_UREAD:
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ndev->bus_name = "microread";
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return 0;
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default:
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dev_err(dev->dev, "Unknown radio type 0x%x\n",
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ndev->radio_type);
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return -EINVAL;
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}
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case MEI_NFC_VENDOR_NXP:
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switch (ndev->radio_type) {
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case MEI_NFC_VENDOR_NXP_PN544:
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ndev->bus_name = "pn544";
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return 0;
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default:
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dev_err(dev->dev, "Unknown radio type 0x%x\n",
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ndev->radio_type);
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return -EINVAL;
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}
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default:
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dev_err(dev->dev, "Unknown vendor ID 0x%x\n",
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ndev->vendor_id);
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return -EINVAL;
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}
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return 0;
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}
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static int mei_nfc_if_version(struct mei_nfc_dev *ndev)
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{
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struct mei_device *dev;
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struct mei_cl *cl;
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struct mei_nfc_cmd cmd;
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struct mei_nfc_reply *reply = NULL;
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struct mei_nfc_if_version *version;
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size_t if_version_length;
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int bytes_recv, ret;
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cl = ndev->cl_info;
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dev = cl->dev;
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memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
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cmd.command = MEI_NFC_CMD_MAINTENANCE;
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cmd.data_size = 1;
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cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
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ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd), 1);
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if (ret < 0) {
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dev_err(dev->dev, "Could not send IF version cmd\n");
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return ret;
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}
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/* to be sure on the stack we alloc memory */
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if_version_length = sizeof(struct mei_nfc_reply) +
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sizeof(struct mei_nfc_if_version);
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reply = kzalloc(if_version_length, GFP_KERNEL);
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if (!reply)
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return -ENOMEM;
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bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length);
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if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
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dev_err(dev->dev, "Could not read IF version\n");
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ret = -EIO;
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goto err;
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}
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version = (struct mei_nfc_if_version *)reply->data;
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ndev->fw_ivn = version->fw_ivn;
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ndev->vendor_id = version->vendor_id;
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ndev->radio_type = version->radio_type;
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err:
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kfree(reply);
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return ret;
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}
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static void mei_nfc_init(struct work_struct *work)
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{
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struct mei_device *dev;
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struct mei_cl_device *cldev;
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struct mei_nfc_dev *ndev;
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struct mei_cl *cl_info;
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struct mei_me_client *me_cl_info;
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ndev = container_of(work, struct mei_nfc_dev, init_work);
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cl_info = ndev->cl_info;
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dev = cl_info->dev;
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mutex_lock(&dev->device_lock);
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/* check for valid client id */
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me_cl_info = mei_me_cl_by_uuid(dev, &mei_nfc_info_guid);
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if (!me_cl_info) {
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mutex_unlock(&dev->device_lock);
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dev_info(dev->dev, "nfc: failed to find the info client\n");
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goto err;
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}
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if (mei_cl_connect(cl_info, me_cl_info, NULL) < 0) {
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mei_me_cl_put(me_cl_info);
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mutex_unlock(&dev->device_lock);
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dev_err(dev->dev, "Could not connect to the NFC INFO ME client");
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goto err;
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}
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mei_me_cl_put(me_cl_info);
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mutex_unlock(&dev->device_lock);
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if (mei_nfc_if_version(ndev) < 0) {
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dev_err(dev->dev, "Could not get the NFC interface version");
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goto err;
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}
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dev_info(dev->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
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ndev->fw_ivn, ndev->vendor_id, ndev->radio_type);
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mutex_lock(&dev->device_lock);
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if (mei_cl_disconnect(cl_info) < 0) {
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mutex_unlock(&dev->device_lock);
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dev_err(dev->dev, "Could not disconnect the NFC INFO ME client");
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goto err;
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}
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mutex_unlock(&dev->device_lock);
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if (mei_nfc_build_bus_name(ndev) < 0) {
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dev_err(dev->dev, "Could not build the bus ID name\n");
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return;
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}
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cldev = mei_cl_add_device(dev, ndev->me_cl, ndev->cl,
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ndev->bus_name);
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if (!cldev) {
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dev_err(dev->dev, "Could not add the NFC device to the MEI bus\n");
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goto err;
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}
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cldev->priv_data = ndev;
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return;
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err:
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mutex_lock(&dev->device_lock);
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mei_nfc_free(ndev);
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mutex_unlock(&dev->device_lock);
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}
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int mei_nfc_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
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{
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struct mei_nfc_dev *ndev;
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struct mei_cl *cl_info, *cl;
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int ret;
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/* in case of internal reset bail out
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* as the device is already setup
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*/
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cl = mei_cl_bus_find_cl_by_uuid(dev, mei_nfc_guid);
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if (cl)
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return 0;
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ndev = kzalloc(sizeof(struct mei_nfc_dev), GFP_KERNEL);
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if (!ndev) {
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ret = -ENOMEM;
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goto err;
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}
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ndev->me_cl = mei_me_cl_get(me_cl);
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if (!ndev->me_cl) {
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ret = -ENODEV;
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goto err;
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}
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cl_info = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
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if (IS_ERR(cl_info)) {
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ret = PTR_ERR(cl_info);
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goto err;
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}
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list_add_tail(&cl_info->device_link, &dev->device_list);
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ndev->cl_info = cl_info;
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cl = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
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if (IS_ERR(cl)) {
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ret = PTR_ERR(cl);
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goto err;
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}
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list_add_tail(&cl->device_link, &dev->device_list);
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ndev->cl = cl;
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INIT_WORK(&ndev->init_work, mei_nfc_init);
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schedule_work(&ndev->init_work);
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return 0;
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err:
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mei_nfc_free(ndev);
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return ret;
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}
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void mei_nfc_host_exit(struct mei_device *dev)
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{
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struct mei_nfc_dev *ndev;
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struct mei_cl *cl;
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struct mei_cl_device *cldev;
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cl = mei_cl_bus_find_cl_by_uuid(dev, mei_nfc_guid);
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if (!cl)
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return;
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cldev = cl->device;
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if (!cldev)
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return;
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ndev = (struct mei_nfc_dev *)cldev->priv_data;
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if (ndev)
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cancel_work_sync(&ndev->init_work);
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cldev->priv_data = NULL;
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/* Need to remove the device here
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* since mei_nfc_free will unlink the clients
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*/
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mei_cl_remove_device(cldev);
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mutex_lock(&dev->device_lock);
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mei_nfc_free(ndev);
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mutex_unlock(&dev->device_lock);
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}
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