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