linux/drivers/misc/mei/bus-fixup.c
Tomas Winkler 1e55b609b9 mei: adjust the copyright notice in the files.
Use unified version of the copyright notice in the files
Update copyright years according the year the files
were touched, except this patch and SPDX conversions.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-28 02:07:54 +09:00

503 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2013-2019, Intel Corporation. All rights reserved.
* Intel Management Engine Interface (Intel MEI) Linux driver
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include <linux/mei_cl_bus.h>
#include "mei_dev.h"
#include "client.h"
#define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)
static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
#define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \
0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c)
#define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)
#define MEI_UUID_MKHIF_FIX UUID_LE(0x55213584, 0x9a29, 0x4916, \
0xba, 0xdf, 0xf, 0xb7, 0xed, 0x68, 0x2a, 0xeb)
#define MEI_UUID_HDCP UUID_LE(0xB638AB7E, 0x94E2, 0x4EA2, \
0xA5, 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
#define MEI_UUID_ANY NULL_UUID_LE
/**
* number_of_connections - determine whether an client be on the bus
* according number of connections
* We support only clients:
* 1. with single connection
* 2. and fixed clients (max_number_of_connections == 0)
*
* @cldev: me clients device
*/
static void number_of_connections(struct mei_cl_device *cldev)
{
dev_dbg(&cldev->dev, "running hook %s\n", __func__);
if (cldev->me_cl->props.max_number_of_connections > 1)
cldev->do_match = 0;
}
/**
* blacklist - blacklist a client from the bus
*
* @cldev: me clients device
*/
static void blacklist(struct mei_cl_device *cldev)
{
dev_dbg(&cldev->dev, "running hook %s\n", __func__);
cldev->do_match = 0;
}
/**
* whitelist - forcefully whitelist client
*
* @cldev: me clients device
*/
static void whitelist(struct mei_cl_device *cldev)
{
dev_dbg(&cldev->dev, "running hook %s\n", __func__);
cldev->do_match = 1;
}
#define OSTYPE_LINUX 2
struct mei_os_ver {
__le16 build;
__le16 reserved1;
u8 os_type;
u8 major;
u8 minor;
u8 reserved2;
} __packed;
#define MKHI_FEATURE_PTT 0x10
struct mkhi_rule_id {
__le16 rule_type;
u8 feature_id;
u8 reserved;
} __packed;
struct mkhi_fwcaps {
struct mkhi_rule_id id;
u8 len;
u8 data[0];
} __packed;
struct mkhi_fw_ver_block {
u16 minor;
u8 major;
u8 platform;
u16 buildno;
u16 hotfix;
} __packed;
struct mkhi_fw_ver {
struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS];
} __packed;
#define MKHI_FWCAPS_GROUP_ID 0x3
#define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
#define MKHI_GEN_GROUP_ID 0xFF
#define MKHI_GEN_GET_FW_VERSION_CMD 0x2
struct mkhi_msg_hdr {
u8 group_id;
u8 command;
u8 reserved;
u8 result;
} __packed;
struct mkhi_msg {
struct mkhi_msg_hdr hdr;
u8 data[0];
} __packed;
#define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
sizeof(struct mkhi_fwcaps) + \
sizeof(struct mei_os_ver))
static int mei_osver(struct mei_cl_device *cldev)
{
const size_t size = MKHI_OSVER_BUF_LEN;
char buf[MKHI_OSVER_BUF_LEN];
struct mkhi_msg *req;
struct mkhi_fwcaps *fwcaps;
struct mei_os_ver *os_ver;
unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;
memset(buf, 0, size);
req = (struct mkhi_msg *)buf;
req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;
fwcaps = (struct mkhi_fwcaps *)req->data;
fwcaps->id.rule_type = 0x0;
fwcaps->id.feature_id = MKHI_FEATURE_PTT;
fwcaps->len = sizeof(*os_ver);
os_ver = (struct mei_os_ver *)fwcaps->data;
os_ver->os_type = OSTYPE_LINUX;
return __mei_cl_send(cldev->cl, buf, size, mode);
}
#define MKHI_FWVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
sizeof(struct mkhi_fw_ver))
#define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \
sizeof(struct mkhi_fw_ver_block) * (__num))
#define MKHI_RCV_TIMEOUT 500 /* receive timeout in msec */
static int mei_fwver(struct mei_cl_device *cldev)
{
char buf[MKHI_FWVER_BUF_LEN];
struct mkhi_msg *req;
struct mkhi_fw_ver *fwver;
int bytes_recv, ret, i;
memset(buf, 0, sizeof(buf));
req = (struct mkhi_msg *)buf;
req->hdr.group_id = MKHI_GEN_GROUP_ID;
req->hdr.command = MKHI_GEN_GET_FW_VERSION_CMD;
ret = __mei_cl_send(cldev->cl, buf, sizeof(struct mkhi_msg_hdr),
MEI_CL_IO_TX_BLOCKING);
if (ret < 0) {
dev_err(&cldev->dev, "Could not send ReqFWVersion cmd\n");
return ret;
}
ret = 0;
bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), 0,
MKHI_RCV_TIMEOUT);
if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) {
/*
* Should be at least one version block,
* error out if nothing found
*/
dev_err(&cldev->dev, "Could not read FW version\n");
return -EIO;
}
fwver = (struct mkhi_fw_ver *)req->data;
memset(cldev->bus->fw_ver, 0, sizeof(cldev->bus->fw_ver));
for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) {
if ((size_t)bytes_recv < MKHI_FWVER_LEN(i + 1))
break;
dev_dbg(&cldev->dev, "FW version%d %d:%d.%d.%d.%d\n",
i, fwver->ver[i].platform,
fwver->ver[i].major, fwver->ver[i].minor,
fwver->ver[i].hotfix, fwver->ver[i].buildno);
cldev->bus->fw_ver[i].platform = fwver->ver[i].platform;
cldev->bus->fw_ver[i].major = fwver->ver[i].major;
cldev->bus->fw_ver[i].minor = fwver->ver[i].minor;
cldev->bus->fw_ver[i].hotfix = fwver->ver[i].hotfix;
cldev->bus->fw_ver[i].buildno = fwver->ver[i].buildno;
}
return ret;
}
static void mei_mkhi_fix(struct mei_cl_device *cldev)
{
int ret;
ret = mei_cldev_enable(cldev);
if (ret)
return;
ret = mei_fwver(cldev);
if (ret < 0)
dev_err(&cldev->dev, "FW version command failed %d\n", ret);
if (cldev->bus->hbm_f_os_supported) {
ret = mei_osver(cldev);
if (ret < 0)
dev_err(&cldev->dev, "OS version command failed %d\n",
ret);
}
mei_cldev_disable(cldev);
}
/**
* mei_wd - wd client on the bus, change protocol version
* as the API has changed.
*
* @cldev: me clients device
*/
#if IS_ENABLED(CONFIG_INTEL_MEI_ME)
#include <linux/pci.h>
#include "hw-me-regs.h"
static void mei_wd(struct mei_cl_device *cldev)
{
struct pci_dev *pdev = to_pci_dev(cldev->dev.parent);
dev_dbg(&cldev->dev, "running hook %s\n", __func__);
if (pdev->device == MEI_DEV_ID_WPT_LP ||
pdev->device == MEI_DEV_ID_SPT ||
pdev->device == MEI_DEV_ID_SPT_H)
cldev->me_cl->props.protocol_version = 0x2;
cldev->do_match = 1;
}
#else
static inline void mei_wd(struct mei_cl_device *cldev) {}
#endif /* CONFIG_INTEL_MEI_ME */
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;
#define MEI_NFC_CMD_MAINTENANCE 0x00
#define MEI_NFC_SUBCMD_IF_VERSION 0x01
/* 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
/**
* mei_nfc_if_version - get NFC interface version
*
* @cl: host client (nfc info)
* @ver: NFC interface version to be filled in
*
* Return: 0 on success; < 0 otherwise
*/
static int mei_nfc_if_version(struct mei_cl *cl,
struct mei_nfc_if_version *ver)
{
struct mei_device *bus;
struct mei_nfc_cmd cmd = {
.command = MEI_NFC_CMD_MAINTENANCE,
.data_size = 1,
.sub_command = MEI_NFC_SUBCMD_IF_VERSION,
};
struct mei_nfc_reply *reply = NULL;
size_t if_version_length;
int bytes_recv, ret;
bus = cl->dev;
WARN_ON(mutex_is_locked(&bus->device_lock));
ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd),
MEI_CL_IO_TX_BLOCKING);
if (ret < 0) {
dev_err(bus->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;
ret = 0;
bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, 0, 0);
if (bytes_recv < 0 || (size_t)bytes_recv < if_version_length) {
dev_err(bus->dev, "Could not read IF version\n");
ret = -EIO;
goto err;
}
memcpy(ver, reply->data, sizeof(struct mei_nfc_if_version));
dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
ver->fw_ivn, ver->vendor_id, ver->radio_type);
err:
kfree(reply);
return ret;
}
/**
* mei_nfc_radio_name - derive nfc radio name from the interface version
*
* @ver: NFC radio version
*
* Return: radio name string
*/
static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
{
if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) {
if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD)
return "microread";
}
if (ver->vendor_id == MEI_NFC_VENDOR_NXP) {
if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544)
return "pn544";
}
return NULL;
}
/**
* mei_nfc - The nfc fixup function. The function retrieves nfc radio
* name and set is as device attribute so we can load
* the proper device driver for it
*
* @cldev: me client device (nfc)
*/
static void mei_nfc(struct mei_cl_device *cldev)
{
struct mei_device *bus;
struct mei_cl *cl;
struct mei_me_client *me_cl = NULL;
struct mei_nfc_if_version ver;
const char *radio_name = NULL;
int ret;
bus = cldev->bus;
dev_dbg(&cldev->dev, "running hook %s\n", __func__);
mutex_lock(&bus->device_lock);
/* we need to connect to INFO GUID */
cl = mei_cl_alloc_linked(bus);
if (IS_ERR(cl)) {
ret = PTR_ERR(cl);
cl = NULL;
dev_err(bus->dev, "nfc hook alloc failed %d\n", ret);
goto out;
}
me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
if (!me_cl) {
ret = -ENOTTY;
dev_err(bus->dev, "Cannot find nfc info %d\n", ret);
goto out;
}
ret = mei_cl_connect(cl, me_cl, NULL);
if (ret < 0) {
dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n",
ret);
goto out;
}
mutex_unlock(&bus->device_lock);
ret = mei_nfc_if_version(cl, &ver);
if (ret)
goto disconnect;
radio_name = mei_nfc_radio_name(&ver);
if (!radio_name) {
ret = -ENOENT;
dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n",
ret);
goto disconnect;
}
dev_dbg(bus->dev, "nfc radio %s\n", radio_name);
strlcpy(cldev->name, radio_name, sizeof(cldev->name));
disconnect:
mutex_lock(&bus->device_lock);
if (mei_cl_disconnect(cl) < 0)
dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n");
mei_cl_flush_queues(cl, NULL);
out:
mei_cl_unlink(cl);
mutex_unlock(&bus->device_lock);
mei_me_cl_put(me_cl);
kfree(cl);
if (ret)
cldev->do_match = 0;
dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
}
#define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
static struct mei_fixup {
const uuid_le uuid;
void (*hook)(struct mei_cl_device *cldev);
} mei_fixups[] = {
MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
MEI_FIXUP(MEI_UUID_WD, mei_wd),
MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
MEI_FIXUP(MEI_UUID_HDCP, whitelist),
};
/**
* mei_cldev_fixup - run fixup handlers
*
* @cldev: me client device
*/
void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev)
{
struct mei_fixup *f;
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
size_t i;
for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
f = &mei_fixups[i];
if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
uuid_le_cmp(f->uuid, *uuid) == 0)
f->hook(cldev);
}
}