![Tomas Winkler](/assets/img/avatar_default.png)
MEI bus was designed around nfc and was hard to extend. Instead of the hard coded way of adding the devices on the mei bus we scan the whole me client list and create a device for each eligible me client (mei_cl_bus_rescan); currently we support only clients with single connection and fixed address clients. NFC radio name detection is run as a fixup routine The patch replaces handling the device list based on struct me_cl to device list based on me_cl_devices. The creating a connection is pushed from the device creation time to device enablement. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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_cl_dev_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_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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