307 lines
6.9 KiB
C
307 lines
6.9 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/uuid.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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#define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
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0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)
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static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
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#define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \
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0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c)
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#define MEI_UUID_ANY NULL_UUID_LE
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/**
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* number_of_connections - determine whether an client be on the bus
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* according number of connections
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* We support only clients:
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* 1. with single connection
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* 2. and fixed clients (max_number_of_connections == 0)
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*
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* @cldev: me clients device
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*/
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static void number_of_connections(struct mei_cl_device *cldev)
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{
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dev_dbg(&cldev->dev, "running hook %s on %pUl\n",
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__func__, mei_me_cl_uuid(cldev->me_cl));
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if (cldev->me_cl->props.max_number_of_connections > 1)
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cldev->do_match = 0;
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}
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/**
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* blacklist - blacklist a client from the bus
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*
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* @cldev: me clients device
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*/
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static void blacklist(struct mei_cl_device *cldev)
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{
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dev_dbg(&cldev->dev, "running hook %s on %pUl\n",
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__func__, mei_me_cl_uuid(cldev->me_cl));
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cldev->do_match = 0;
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}
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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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#define MEI_NFC_CMD_MAINTENANCE 0x00
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#define MEI_NFC_SUBCMD_IF_VERSION 0x01
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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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/**
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* mei_nfc_if_version - get NFC interface version
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*
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* @cl: host client (nfc info)
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* @ver: NFC interface version to be filled in
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*
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* Return: 0 on success; < 0 otherwise
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*/
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static int mei_nfc_if_version(struct mei_cl *cl,
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struct mei_nfc_if_version *ver)
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{
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struct mei_device *bus;
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struct mei_nfc_cmd cmd = {
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.command = MEI_NFC_CMD_MAINTENANCE,
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.data_size = 1,
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.sub_command = MEI_NFC_SUBCMD_IF_VERSION,
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};
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struct mei_nfc_reply *reply = NULL;
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size_t if_version_length;
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int bytes_recv, ret;
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bus = cl->dev;
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WARN_ON(mutex_is_locked(&bus->device_lock));
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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(bus->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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ret = 0;
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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(bus->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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memcpy(ver, reply->data, sizeof(struct mei_nfc_if_version));
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dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
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ver->fw_ivn, ver->vendor_id, ver->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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/**
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* mei_nfc_radio_name - derive nfc radio name from the interface version
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*
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* @ver: NFC radio version
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*
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* Return: radio name string
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*/
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static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
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{
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if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) {
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if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD)
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return "microread";
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}
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if (ver->vendor_id == MEI_NFC_VENDOR_NXP) {
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if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544)
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return "pn544";
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}
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return NULL;
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}
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/**
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* mei_nfc - The nfc fixup function. The function retrieves nfc radio
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* name and set is as device attribute so we can load
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* the proper device driver for it
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*
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* @cldev: me client device (nfc)
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*/
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static void mei_nfc(struct mei_cl_device *cldev)
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{
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struct mei_device *bus;
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struct mei_cl *cl;
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struct mei_me_client *me_cl = NULL;
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struct mei_nfc_if_version ver;
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const char *radio_name = NULL;
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int ret;
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bus = cldev->bus;
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dev_dbg(bus->dev, "running hook %s: %pUl match=%d\n",
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__func__, mei_me_cl_uuid(cldev->me_cl), cldev->do_match);
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mutex_lock(&bus->device_lock);
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/* we need to connect to INFO GUID */
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cl = mei_cl_alloc_linked(bus, 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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cl = NULL;
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dev_err(bus->dev, "nfc hook alloc failed %d\n", ret);
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goto out;
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}
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me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
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if (!me_cl) {
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ret = -ENOTTY;
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dev_err(bus->dev, "Cannot find nfc info %d\n", ret);
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goto out;
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}
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ret = mei_cl_connect(cl, me_cl, NULL);
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if (ret < 0) {
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dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n",
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ret);
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goto out;
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}
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mutex_unlock(&bus->device_lock);
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ret = mei_nfc_if_version(cl, &ver);
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if (ret)
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goto disconnect;
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radio_name = mei_nfc_radio_name(&ver);
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if (!radio_name) {
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ret = -ENOENT;
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dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n",
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ret);
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goto disconnect;
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}
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dev_dbg(bus->dev, "nfc radio %s\n", radio_name);
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strlcpy(cldev->name, radio_name, sizeof(cldev->name));
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disconnect:
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mutex_lock(&bus->device_lock);
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if (mei_cl_disconnect(cl) < 0)
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dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n");
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mei_cl_flush_queues(cl, NULL);
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out:
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mei_cl_unlink(cl);
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mutex_unlock(&bus->device_lock);
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mei_me_cl_put(me_cl);
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kfree(cl);
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if (ret)
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cldev->do_match = 0;
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dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
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}
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#define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
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static struct mei_fixup {
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const uuid_le uuid;
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void (*hook)(struct mei_cl_device *cldev);
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} mei_fixups[] = {
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MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
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MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
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MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
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};
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/**
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* mei_cldev_fixup - run fixup handlers
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*
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* @cldev: me client device
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*/
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void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev)
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{
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struct mei_fixup *f;
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const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
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int i;
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for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
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f = &mei_fixups[i];
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if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
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uuid_le_cmp(f->uuid, *uuid) == 0)
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f->hook(cldev);
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}
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}
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