// SPDX-License-Identifier: GPL-2.0
|
/*
|
* Copyright (c) 2012-2019, Intel Corporation. All rights reserved.
|
* Intel Management Engine Interface (Intel MEI) Linux driver
|
*/
|
|
#include <linux/module.h>
|
#include <linux/device.h>
|
#include <linux/kernel.h>
|
#include <linux/sched/signal.h>
|
#include <linux/init.h>
|
#include <linux/errno.h>
|
#include <linux/slab.h>
|
#include <linux/mutex.h>
|
#include <linux/interrupt.h>
|
#include <linux/mei_cl_bus.h>
|
|
#include "mei_dev.h"
|
#include "client.h"
|
|
#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
|
|
/**
|
* __mei_cl_send - internal client send (write)
|
*
|
* @cl: host client
|
* @buf: buffer to send
|
* @length: buffer length
|
* @mode: sending mode
|
*
|
* Return: written size bytes or < 0 on error
|
*/
|
ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
|
unsigned int mode)
|
{
|
struct mei_device *bus;
|
struct mei_cl_cb *cb;
|
ssize_t rets;
|
|
if (WARN_ON(!cl || !cl->dev))
|
return -ENODEV;
|
|
bus = cl->dev;
|
|
mutex_lock(&bus->device_lock);
|
if (bus->dev_state != MEI_DEV_ENABLED) {
|
rets = -ENODEV;
|
goto out;
|
}
|
|
if (!mei_cl_is_connected(cl)) {
|
rets = -ENODEV;
|
goto out;
|
}
|
|
/* Check if we have an ME client device */
|
if (!mei_me_cl_is_active(cl->me_cl)) {
|
rets = -ENOTTY;
|
goto out;
|
}
|
|
if (length > mei_cl_mtu(cl)) {
|
rets = -EFBIG;
|
goto out;
|
}
|
|
while (cl->tx_cb_queued >= bus->tx_queue_limit) {
|
mutex_unlock(&bus->device_lock);
|
rets = wait_event_interruptible(cl->tx_wait,
|
cl->writing_state == MEI_WRITE_COMPLETE ||
|
(!mei_cl_is_connected(cl)));
|
mutex_lock(&bus->device_lock);
|
if (rets) {
|
if (signal_pending(current))
|
rets = -EINTR;
|
goto out;
|
}
|
if (!mei_cl_is_connected(cl)) {
|
rets = -ENODEV;
|
goto out;
|
}
|
}
|
|
cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
|
if (!cb) {
|
rets = -ENOMEM;
|
goto out;
|
}
|
|
cb->internal = !!(mode & MEI_CL_IO_TX_INTERNAL);
|
cb->blocking = !!(mode & MEI_CL_IO_TX_BLOCKING);
|
memcpy(cb->buf.data, buf, length);
|
|
rets = mei_cl_write(cl, cb);
|
|
out:
|
mutex_unlock(&bus->device_lock);
|
|
return rets;
|
}
|
|
/**
|
* __mei_cl_recv - internal client receive (read)
|
*
|
* @cl: host client
|
* @buf: buffer to receive
|
* @length: buffer length
|
* @mode: io mode
|
* @timeout: recv timeout, 0 for infinite timeout
|
*
|
* Return: read size in bytes of < 0 on error
|
*/
|
ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length,
|
unsigned int mode, unsigned long timeout)
|
{
|
struct mei_device *bus;
|
struct mei_cl_cb *cb;
|
size_t r_length;
|
ssize_t rets;
|
bool nonblock = !!(mode & MEI_CL_IO_RX_NONBLOCK);
|
|
if (WARN_ON(!cl || !cl->dev))
|
return -ENODEV;
|
|
bus = cl->dev;
|
|
mutex_lock(&bus->device_lock);
|
if (bus->dev_state != MEI_DEV_ENABLED) {
|
rets = -ENODEV;
|
goto out;
|
}
|
|
cb = mei_cl_read_cb(cl, NULL);
|
if (cb)
|
goto copy;
|
|
rets = mei_cl_read_start(cl, length, NULL);
|
if (rets && rets != -EBUSY)
|
goto out;
|
|
if (nonblock) {
|
rets = -EAGAIN;
|
goto out;
|
}
|
|
/* wait on event only if there is no other waiter */
|
/* synchronized under device mutex */
|
if (!waitqueue_active(&cl->rx_wait)) {
|
|
mutex_unlock(&bus->device_lock);
|
|
if (timeout) {
|
rets = wait_event_interruptible_timeout
|
(cl->rx_wait,
|
mei_cl_read_cb(cl, NULL) ||
|
(!mei_cl_is_connected(cl)),
|
msecs_to_jiffies(timeout));
|
if (rets == 0)
|
return -ETIME;
|
if (rets < 0) {
|
if (signal_pending(current))
|
return -EINTR;
|
return -ERESTARTSYS;
|
}
|
} else {
|
if (wait_event_interruptible
|
(cl->rx_wait,
|
mei_cl_read_cb(cl, NULL) ||
|
(!mei_cl_is_connected(cl)))) {
|
if (signal_pending(current))
|
return -EINTR;
|
return -ERESTARTSYS;
|
}
|
}
|
|
mutex_lock(&bus->device_lock);
|
|
if (!mei_cl_is_connected(cl)) {
|
rets = -ENODEV;
|
goto out;
|
}
|
}
|
|
cb = mei_cl_read_cb(cl, NULL);
|
if (!cb) {
|
rets = 0;
|
goto out;
|
}
|
|
copy:
|
if (cb->status) {
|
rets = cb->status;
|
goto free;
|
}
|
|
r_length = min_t(size_t, length, cb->buf_idx);
|
memcpy(buf, cb->buf.data, r_length);
|
rets = r_length;
|
|
free:
|
mei_cl_del_rd_completed(cl, cb);
|
out:
|
mutex_unlock(&bus->device_lock);
|
|
return rets;
|
}
|
|
/**
|
* mei_cldev_send - me device send (write)
|
*
|
* @cldev: me client device
|
* @buf: buffer to send
|
* @length: buffer length
|
*
|
* Return: written size in bytes or < 0 on error
|
*/
|
ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
|
{
|
struct mei_cl *cl = cldev->cl;
|
|
return __mei_cl_send(cl, buf, length, MEI_CL_IO_TX_BLOCKING);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_send);
|
|
/**
|
* mei_cldev_recv_nonblock - non block client receive (read)
|
*
|
* @cldev: me client device
|
* @buf: buffer to receive
|
* @length: buffer length
|
*
|
* Return: read size in bytes of < 0 on error
|
* -EAGAIN if function will block.
|
*/
|
ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
|
size_t length)
|
{
|
struct mei_cl *cl = cldev->cl;
|
|
return __mei_cl_recv(cl, buf, length, MEI_CL_IO_RX_NONBLOCK, 0);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
|
|
/**
|
* mei_cldev_recv - client receive (read)
|
*
|
* @cldev: me client device
|
* @buf: buffer to receive
|
* @length: buffer length
|
*
|
* Return: read size in bytes of < 0 on error
|
*/
|
ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
|
{
|
struct mei_cl *cl = cldev->cl;
|
|
return __mei_cl_recv(cl, buf, length, 0, 0);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_recv);
|
|
/**
|
* mei_cl_bus_rx_work - dispatch rx event for a bus device
|
*
|
* @work: work
|
*/
|
static void mei_cl_bus_rx_work(struct work_struct *work)
|
{
|
struct mei_cl_device *cldev;
|
struct mei_device *bus;
|
|
cldev = container_of(work, struct mei_cl_device, rx_work);
|
|
bus = cldev->bus;
|
|
if (cldev->rx_cb)
|
cldev->rx_cb(cldev);
|
|
mutex_lock(&bus->device_lock);
|
mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
|
mutex_unlock(&bus->device_lock);
|
}
|
|
/**
|
* mei_cl_bus_notif_work - dispatch FW notif event for a bus device
|
*
|
* @work: work
|
*/
|
static void mei_cl_bus_notif_work(struct work_struct *work)
|
{
|
struct mei_cl_device *cldev;
|
|
cldev = container_of(work, struct mei_cl_device, notif_work);
|
|
if (cldev->notif_cb)
|
cldev->notif_cb(cldev);
|
}
|
|
/**
|
* mei_cl_bus_notify_event - schedule notify cb on bus client
|
*
|
* @cl: host client
|
*
|
* Return: true if event was scheduled
|
* false if the client is not waiting for event
|
*/
|
bool mei_cl_bus_notify_event(struct mei_cl *cl)
|
{
|
struct mei_cl_device *cldev = cl->cldev;
|
|
if (!cldev || !cldev->notif_cb)
|
return false;
|
|
if (!cl->notify_ev)
|
return false;
|
|
schedule_work(&cldev->notif_work);
|
|
cl->notify_ev = false;
|
|
return true;
|
}
|
|
/**
|
* mei_cl_bus_rx_event - schedule rx event
|
*
|
* @cl: host client
|
*
|
* Return: true if event was scheduled
|
* false if the client is not waiting for event
|
*/
|
bool mei_cl_bus_rx_event(struct mei_cl *cl)
|
{
|
struct mei_cl_device *cldev = cl->cldev;
|
|
if (!cldev || !cldev->rx_cb)
|
return false;
|
|
schedule_work(&cldev->rx_work);
|
|
return true;
|
}
|
|
/**
|
* mei_cldev_register_rx_cb - register Rx event callback
|
*
|
* @cldev: me client devices
|
* @rx_cb: callback function
|
*
|
* Return: 0 on success
|
* -EALREADY if an callback is already registered
|
* <0 on other errors
|
*/
|
int mei_cldev_register_rx_cb(struct mei_cl_device *cldev, mei_cldev_cb_t rx_cb)
|
{
|
struct mei_device *bus = cldev->bus;
|
int ret;
|
|
if (!rx_cb)
|
return -EINVAL;
|
if (cldev->rx_cb)
|
return -EALREADY;
|
|
cldev->rx_cb = rx_cb;
|
INIT_WORK(&cldev->rx_work, mei_cl_bus_rx_work);
|
|
mutex_lock(&bus->device_lock);
|
ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
|
mutex_unlock(&bus->device_lock);
|
if (ret && ret != -EBUSY)
|
return ret;
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_register_rx_cb);
|
|
/**
|
* mei_cldev_register_notif_cb - register FW notification event callback
|
*
|
* @cldev: me client devices
|
* @notif_cb: callback function
|
*
|
* Return: 0 on success
|
* -EALREADY if an callback is already registered
|
* <0 on other errors
|
*/
|
int mei_cldev_register_notif_cb(struct mei_cl_device *cldev,
|
mei_cldev_cb_t notif_cb)
|
{
|
struct mei_device *bus = cldev->bus;
|
int ret;
|
|
if (!notif_cb)
|
return -EINVAL;
|
|
if (cldev->notif_cb)
|
return -EALREADY;
|
|
cldev->notif_cb = notif_cb;
|
INIT_WORK(&cldev->notif_work, mei_cl_bus_notif_work);
|
|
mutex_lock(&bus->device_lock);
|
ret = mei_cl_notify_request(cldev->cl, NULL, 1);
|
mutex_unlock(&bus->device_lock);
|
if (ret)
|
return ret;
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_register_notif_cb);
|
|
/**
|
* mei_cldev_get_drvdata - driver data getter
|
*
|
* @cldev: mei client device
|
*
|
* Return: driver private data
|
*/
|
void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev)
|
{
|
return dev_get_drvdata(&cldev->dev);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_get_drvdata);
|
|
/**
|
* mei_cldev_set_drvdata - driver data setter
|
*
|
* @cldev: mei client device
|
* @data: data to store
|
*/
|
void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data)
|
{
|
dev_set_drvdata(&cldev->dev, data);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_set_drvdata);
|
|
/**
|
* mei_cldev_uuid - return uuid of the underlying me client
|
*
|
* @cldev: mei client device
|
*
|
* Return: me client uuid
|
*/
|
const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev)
|
{
|
return mei_me_cl_uuid(cldev->me_cl);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_uuid);
|
|
/**
|
* mei_cldev_ver - return protocol version of the underlying me client
|
*
|
* @cldev: mei client device
|
*
|
* Return: me client protocol version
|
*/
|
u8 mei_cldev_ver(const struct mei_cl_device *cldev)
|
{
|
return mei_me_cl_ver(cldev->me_cl);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_ver);
|
|
/**
|
* mei_cldev_enabled - check whether the device is enabled
|
*
|
* @cldev: mei client device
|
*
|
* Return: true if me client is initialized and connected
|
*/
|
bool mei_cldev_enabled(struct mei_cl_device *cldev)
|
{
|
return mei_cl_is_connected(cldev->cl);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_enabled);
|
|
/**
|
* mei_cl_bus_module_get - acquire module of the underlying
|
* hw driver.
|
*
|
* @cldev: mei client device
|
*
|
* Return: true on success; false if the module was removed.
|
*/
|
static bool mei_cl_bus_module_get(struct mei_cl_device *cldev)
|
{
|
return try_module_get(cldev->bus->dev->driver->owner);
|
}
|
|
/**
|
* mei_cl_bus_module_put - release the underlying hw module.
|
*
|
* @cldev: mei client device
|
*/
|
static void mei_cl_bus_module_put(struct mei_cl_device *cldev)
|
{
|
module_put(cldev->bus->dev->driver->owner);
|
}
|
|
/**
|
* mei_cl_bus_vtag - get bus vtag entry wrapper
|
* The tag for bus client is always first.
|
*
|
* @cl: host client
|
*
|
* Return: bus vtag or NULL
|
*/
|
static inline struct mei_cl_vtag *mei_cl_bus_vtag(struct mei_cl *cl)
|
{
|
return list_first_entry_or_null(&cl->vtag_map,
|
struct mei_cl_vtag, list);
|
}
|
|
/**
|
* mei_cl_bus_vtag_alloc - add bus client entry to vtag map
|
*
|
* @cldev: me client device
|
*
|
* Return:
|
* * 0 on success
|
* * -ENOMEM if memory allocation failed
|
*/
|
static int mei_cl_bus_vtag_alloc(struct mei_cl_device *cldev)
|
{
|
struct mei_cl *cl = cldev->cl;
|
struct mei_cl_vtag *cl_vtag;
|
|
/*
|
* Bail out if the client does not supports vtags
|
* or has already allocated one
|
*/
|
if (mei_cl_vt_support_check(cl) || mei_cl_bus_vtag(cl))
|
return 0;
|
|
cl_vtag = mei_cl_vtag_alloc(NULL, 0);
|
if (IS_ERR(cl_vtag))
|
return -ENOMEM;
|
|
list_add_tail(&cl_vtag->list, &cl->vtag_map);
|
|
return 0;
|
}
|
|
/**
|
* mei_cl_bus_vtag_free - remove the bus entry from vtag map
|
*
|
* @cldev: me client device
|
*/
|
static void mei_cl_bus_vtag_free(struct mei_cl_device *cldev)
|
{
|
struct mei_cl *cl = cldev->cl;
|
struct mei_cl_vtag *cl_vtag;
|
|
cl_vtag = mei_cl_bus_vtag(cl);
|
if (!cl_vtag)
|
return;
|
|
list_del(&cl_vtag->list);
|
kfree(cl_vtag);
|
}
|
|
/**
|
* mei_cldev_enable - enable me client device
|
* create connection with me client
|
*
|
* @cldev: me client device
|
*
|
* Return: 0 on success and < 0 on error
|
*/
|
int mei_cldev_enable(struct mei_cl_device *cldev)
|
{
|
struct mei_device *bus = cldev->bus;
|
struct mei_cl *cl;
|
int ret;
|
|
cl = cldev->cl;
|
|
mutex_lock(&bus->device_lock);
|
if (cl->state == MEI_FILE_UNINITIALIZED) {
|
ret = mei_cl_link(cl);
|
if (ret)
|
goto out;
|
/* update pointers */
|
cl->cldev = cldev;
|
}
|
|
if (mei_cl_is_connected(cl)) {
|
ret = 0;
|
goto out;
|
}
|
|
if (!mei_me_cl_is_active(cldev->me_cl)) {
|
dev_err(&cldev->dev, "me client is not active\n");
|
ret = -ENOTTY;
|
goto out;
|
}
|
|
ret = mei_cl_bus_vtag_alloc(cldev);
|
if (ret)
|
goto out;
|
|
ret = mei_cl_connect(cl, cldev->me_cl, NULL);
|
if (ret < 0) {
|
dev_err(&cldev->dev, "cannot connect\n");
|
mei_cl_bus_vtag_free(cldev);
|
}
|
|
out:
|
mutex_unlock(&bus->device_lock);
|
|
return ret;
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_enable);
|
|
/**
|
* mei_cldev_unregister_callbacks - internal wrapper for unregistering
|
* callbacks.
|
*
|
* @cldev: client device
|
*/
|
static void mei_cldev_unregister_callbacks(struct mei_cl_device *cldev)
|
{
|
if (cldev->rx_cb) {
|
cancel_work_sync(&cldev->rx_work);
|
cldev->rx_cb = NULL;
|
}
|
|
if (cldev->notif_cb) {
|
cancel_work_sync(&cldev->notif_work);
|
cldev->notif_cb = NULL;
|
}
|
}
|
|
/**
|
* mei_cldev_disable - disable me client device
|
* disconnect form the me client
|
*
|
* @cldev: me client device
|
*
|
* Return: 0 on success and < 0 on error
|
*/
|
int mei_cldev_disable(struct mei_cl_device *cldev)
|
{
|
struct mei_device *bus;
|
struct mei_cl *cl;
|
int err;
|
|
if (!cldev)
|
return -ENODEV;
|
|
cl = cldev->cl;
|
|
bus = cldev->bus;
|
|
mei_cldev_unregister_callbacks(cldev);
|
|
mutex_lock(&bus->device_lock);
|
|
mei_cl_bus_vtag_free(cldev);
|
|
if (!mei_cl_is_connected(cl)) {
|
dev_dbg(bus->dev, "Already disconnected\n");
|
err = 0;
|
goto out;
|
}
|
|
err = mei_cl_disconnect(cl);
|
if (err < 0)
|
dev_err(bus->dev, "Could not disconnect from the ME client\n");
|
|
out:
|
/* Flush queues and remove any pending read */
|
mei_cl_flush_queues(cl, NULL);
|
mei_cl_unlink(cl);
|
|
mutex_unlock(&bus->device_lock);
|
return err;
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_disable);
|
|
/**
|
* mei_cl_device_find - find matching entry in the driver id table
|
*
|
* @cldev: me client device
|
* @cldrv: me client driver
|
*
|
* Return: id on success; NULL if no id is matching
|
*/
|
static const
|
struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev,
|
struct mei_cl_driver *cldrv)
|
{
|
const struct mei_cl_device_id *id;
|
const uuid_le *uuid;
|
u8 version;
|
bool match;
|
|
uuid = mei_me_cl_uuid(cldev->me_cl);
|
version = mei_me_cl_ver(cldev->me_cl);
|
|
id = cldrv->id_table;
|
while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) {
|
if (!uuid_le_cmp(*uuid, id->uuid)) {
|
match = true;
|
|
if (cldev->name[0])
|
if (strncmp(cldev->name, id->name,
|
sizeof(id->name)))
|
match = false;
|
|
if (id->version != MEI_CL_VERSION_ANY)
|
if (id->version != version)
|
match = false;
|
if (match)
|
return id;
|
}
|
|
id++;
|
}
|
|
return NULL;
|
}
|
|
/**
|
* mei_cl_device_match - device match function
|
*
|
* @dev: device
|
* @drv: driver
|
*
|
* Return: 1 if matching device was found 0 otherwise
|
*/
|
static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
struct mei_cl_driver *cldrv = to_mei_cl_driver(drv);
|
const struct mei_cl_device_id *found_id;
|
|
if (!cldev)
|
return 0;
|
|
if (!cldev->do_match)
|
return 0;
|
|
if (!cldrv || !cldrv->id_table)
|
return 0;
|
|
found_id = mei_cl_device_find(cldev, cldrv);
|
if (found_id)
|
return 1;
|
|
return 0;
|
}
|
|
/**
|
* mei_cl_device_probe - bus probe function
|
*
|
* @dev: device
|
*
|
* Return: 0 on success; < 0 otherwise
|
*/
|
static int mei_cl_device_probe(struct device *dev)
|
{
|
struct mei_cl_device *cldev;
|
struct mei_cl_driver *cldrv;
|
const struct mei_cl_device_id *id;
|
int ret;
|
|
cldev = to_mei_cl_device(dev);
|
cldrv = to_mei_cl_driver(dev->driver);
|
|
if (!cldev)
|
return 0;
|
|
if (!cldrv || !cldrv->probe)
|
return -ENODEV;
|
|
id = mei_cl_device_find(cldev, cldrv);
|
if (!id)
|
return -ENODEV;
|
|
if (!mei_cl_bus_module_get(cldev)) {
|
dev_err(&cldev->dev, "get hw module failed");
|
return -ENODEV;
|
}
|
|
ret = cldrv->probe(cldev, id);
|
if (ret) {
|
mei_cl_bus_module_put(cldev);
|
return ret;
|
}
|
|
__module_get(THIS_MODULE);
|
return 0;
|
}
|
|
/**
|
* mei_cl_device_remove - remove device from the bus
|
*
|
* @dev: device
|
*
|
* Return: 0 on success; < 0 otherwise
|
*/
|
static int mei_cl_device_remove(struct device *dev)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
struct mei_cl_driver *cldrv;
|
int ret = 0;
|
|
if (!cldev || !dev->driver)
|
return 0;
|
|
cldrv = to_mei_cl_driver(dev->driver);
|
if (cldrv->remove)
|
ret = cldrv->remove(cldev);
|
|
mei_cldev_unregister_callbacks(cldev);
|
|
mei_cl_bus_module_put(cldev);
|
module_put(THIS_MODULE);
|
|
return ret;
|
}
|
|
static ssize_t name_show(struct device *dev, struct device_attribute *a,
|
char *buf)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
return scnprintf(buf, PAGE_SIZE, "%s", cldev->name);
|
}
|
static DEVICE_ATTR_RO(name);
|
|
static ssize_t uuid_show(struct device *dev, struct device_attribute *a,
|
char *buf)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
|
|
return sprintf(buf, "%pUl", uuid);
|
}
|
static DEVICE_ATTR_RO(uuid);
|
|
static ssize_t version_show(struct device *dev, struct device_attribute *a,
|
char *buf)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
u8 version = mei_me_cl_ver(cldev->me_cl);
|
|
return sprintf(buf, "%02X", version);
|
}
|
static DEVICE_ATTR_RO(version);
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
|
char *buf)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
|
u8 version = mei_me_cl_ver(cldev->me_cl);
|
|
return scnprintf(buf, PAGE_SIZE, "mei:%s:%pUl:%02X:",
|
cldev->name, uuid, version);
|
}
|
static DEVICE_ATTR_RO(modalias);
|
|
static ssize_t max_conn_show(struct device *dev, struct device_attribute *a,
|
char *buf)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
u8 maxconn = mei_me_cl_max_conn(cldev->me_cl);
|
|
return sprintf(buf, "%d", maxconn);
|
}
|
static DEVICE_ATTR_RO(max_conn);
|
|
static ssize_t fixed_show(struct device *dev, struct device_attribute *a,
|
char *buf)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
u8 fixed = mei_me_cl_fixed(cldev->me_cl);
|
|
return sprintf(buf, "%d", fixed);
|
}
|
static DEVICE_ATTR_RO(fixed);
|
|
static ssize_t vtag_show(struct device *dev, struct device_attribute *a,
|
char *buf)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
bool vt = mei_me_cl_vt(cldev->me_cl);
|
|
return sprintf(buf, "%d", vt);
|
}
|
static DEVICE_ATTR_RO(vtag);
|
|
static ssize_t max_len_show(struct device *dev, struct device_attribute *a,
|
char *buf)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
u32 maxlen = mei_me_cl_max_len(cldev->me_cl);
|
|
return sprintf(buf, "%u", maxlen);
|
}
|
static DEVICE_ATTR_RO(max_len);
|
|
static struct attribute *mei_cldev_attrs[] = {
|
&dev_attr_name.attr,
|
&dev_attr_uuid.attr,
|
&dev_attr_version.attr,
|
&dev_attr_modalias.attr,
|
&dev_attr_max_conn.attr,
|
&dev_attr_fixed.attr,
|
&dev_attr_vtag.attr,
|
&dev_attr_max_len.attr,
|
NULL,
|
};
|
ATTRIBUTE_GROUPS(mei_cldev);
|
|
/**
|
* mei_cl_device_uevent - me client bus uevent handler
|
*
|
* @dev: device
|
* @env: uevent kobject
|
*
|
* Return: 0 on success -ENOMEM on when add_uevent_var fails
|
*/
|
static int mei_cl_device_uevent(struct device *dev, struct kobj_uevent_env *env)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
|
u8 version = mei_me_cl_ver(cldev->me_cl);
|
|
if (add_uevent_var(env, "MEI_CL_VERSION=%d", version))
|
return -ENOMEM;
|
|
if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid))
|
return -ENOMEM;
|
|
if (add_uevent_var(env, "MEI_CL_NAME=%s", cldev->name))
|
return -ENOMEM;
|
|
if (add_uevent_var(env, "MODALIAS=mei:%s:%pUl:%02X:",
|
cldev->name, uuid, version))
|
return -ENOMEM;
|
|
return 0;
|
}
|
|
static struct bus_type mei_cl_bus_type = {
|
.name = "mei",
|
.dev_groups = mei_cldev_groups,
|
.match = mei_cl_device_match,
|
.probe = mei_cl_device_probe,
|
.remove = mei_cl_device_remove,
|
.uevent = mei_cl_device_uevent,
|
};
|
|
static struct mei_device *mei_dev_bus_get(struct mei_device *bus)
|
{
|
if (bus)
|
get_device(bus->dev);
|
|
return bus;
|
}
|
|
static void mei_dev_bus_put(struct mei_device *bus)
|
{
|
if (bus)
|
put_device(bus->dev);
|
}
|
|
static void mei_cl_bus_dev_release(struct device *dev)
|
{
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
if (!cldev)
|
return;
|
|
mei_me_cl_put(cldev->me_cl);
|
mei_dev_bus_put(cldev->bus);
|
mei_cl_unlink(cldev->cl);
|
kfree(cldev->cl);
|
kfree(cldev);
|
}
|
|
static const struct device_type mei_cl_device_type = {
|
.release = mei_cl_bus_dev_release,
|
};
|
|
/**
|
* mei_cl_bus_set_name - set device name for me client device
|
* <controller>-<client device>
|
* Example: 0000:00:16.0-55213584-9a29-4916-badf-0fb7ed682aeb
|
*
|
* @cldev: me client device
|
*/
|
static inline void mei_cl_bus_set_name(struct mei_cl_device *cldev)
|
{
|
dev_set_name(&cldev->dev, "%s-%pUl",
|
dev_name(cldev->bus->dev),
|
mei_me_cl_uuid(cldev->me_cl));
|
}
|
|
/**
|
* mei_cl_bus_dev_alloc - initialize and allocate mei client device
|
*
|
* @bus: mei device
|
* @me_cl: me client
|
*
|
* Return: allocated device structur or NULL on allocation failure
|
*/
|
static struct mei_cl_device *mei_cl_bus_dev_alloc(struct mei_device *bus,
|
struct mei_me_client *me_cl)
|
{
|
struct mei_cl_device *cldev;
|
struct mei_cl *cl;
|
|
cldev = kzalloc(sizeof(*cldev), GFP_KERNEL);
|
if (!cldev)
|
return NULL;
|
|
cl = mei_cl_allocate(bus);
|
if (!cl) {
|
kfree(cldev);
|
return NULL;
|
}
|
|
device_initialize(&cldev->dev);
|
cldev->dev.parent = bus->dev;
|
cldev->dev.bus = &mei_cl_bus_type;
|
cldev->dev.type = &mei_cl_device_type;
|
cldev->bus = mei_dev_bus_get(bus);
|
cldev->me_cl = mei_me_cl_get(me_cl);
|
cldev->cl = cl;
|
mei_cl_bus_set_name(cldev);
|
cldev->is_added = 0;
|
INIT_LIST_HEAD(&cldev->bus_list);
|
|
return cldev;
|
}
|
|
/**
|
* mei_cl_dev_setup - setup me client device
|
* run fix up routines and set the device name
|
*
|
* @bus: mei device
|
* @cldev: me client device
|
*
|
* Return: true if the device is eligible for enumeration
|
*/
|
static bool mei_cl_bus_dev_setup(struct mei_device *bus,
|
struct mei_cl_device *cldev)
|
{
|
cldev->do_match = 1;
|
mei_cl_bus_dev_fixup(cldev);
|
|
/* the device name can change during fix up */
|
if (cldev->do_match)
|
mei_cl_bus_set_name(cldev);
|
|
return cldev->do_match == 1;
|
}
|
|
/**
|
* mei_cl_bus_dev_add - add me client devices
|
*
|
* @cldev: me client device
|
*
|
* Return: 0 on success; < 0 on failre
|
*/
|
static int mei_cl_bus_dev_add(struct mei_cl_device *cldev)
|
{
|
int ret;
|
|
dev_dbg(cldev->bus->dev, "adding %pUL:%02X\n",
|
mei_me_cl_uuid(cldev->me_cl),
|
mei_me_cl_ver(cldev->me_cl));
|
ret = device_add(&cldev->dev);
|
if (!ret)
|
cldev->is_added = 1;
|
|
return ret;
|
}
|
|
/**
|
* mei_cl_bus_dev_stop - stop the driver
|
*
|
* @cldev: me client device
|
*/
|
static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev)
|
{
|
if (cldev->is_added)
|
device_release_driver(&cldev->dev);
|
}
|
|
/**
|
* mei_cl_bus_dev_destroy - destroy me client devices object
|
*
|
* @cldev: me client device
|
*
|
* Locking: called under "dev->cl_bus_lock" lock
|
*/
|
static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev)
|
{
|
|
WARN_ON(!mutex_is_locked(&cldev->bus->cl_bus_lock));
|
|
if (!cldev->is_added)
|
return;
|
|
device_del(&cldev->dev);
|
|
list_del_init(&cldev->bus_list);
|
|
cldev->is_added = 0;
|
put_device(&cldev->dev);
|
}
|
|
/**
|
* mei_cl_bus_remove_device - remove a devices form the bus
|
*
|
* @cldev: me client device
|
*/
|
static void mei_cl_bus_remove_device(struct mei_cl_device *cldev)
|
{
|
mei_cl_bus_dev_stop(cldev);
|
mei_cl_bus_dev_destroy(cldev);
|
}
|
|
/**
|
* mei_cl_bus_remove_devices - remove all devices form the bus
|
*
|
* @bus: mei device
|
*/
|
void mei_cl_bus_remove_devices(struct mei_device *bus)
|
{
|
struct mei_cl_device *cldev, *next;
|
|
mutex_lock(&bus->cl_bus_lock);
|
list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list)
|
mei_cl_bus_remove_device(cldev);
|
mutex_unlock(&bus->cl_bus_lock);
|
}
|
|
|
/**
|
* mei_cl_bus_dev_init - allocate and initializes an mei client devices
|
* based on me client
|
*
|
* @bus: mei device
|
* @me_cl: me client
|
*
|
* Locking: called under "dev->cl_bus_lock" lock
|
*/
|
static void mei_cl_bus_dev_init(struct mei_device *bus,
|
struct mei_me_client *me_cl)
|
{
|
struct mei_cl_device *cldev;
|
|
WARN_ON(!mutex_is_locked(&bus->cl_bus_lock));
|
|
dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl));
|
|
if (me_cl->bus_added)
|
return;
|
|
cldev = mei_cl_bus_dev_alloc(bus, me_cl);
|
if (!cldev)
|
return;
|
|
me_cl->bus_added = true;
|
list_add_tail(&cldev->bus_list, &bus->device_list);
|
|
}
|
|
/**
|
* mei_cl_bus_rescan - scan me clients list and add create
|
* devices for eligible clients
|
*
|
* @bus: mei device
|
*/
|
static void mei_cl_bus_rescan(struct mei_device *bus)
|
{
|
struct mei_cl_device *cldev, *n;
|
struct mei_me_client *me_cl;
|
|
mutex_lock(&bus->cl_bus_lock);
|
|
down_read(&bus->me_clients_rwsem);
|
list_for_each_entry(me_cl, &bus->me_clients, list)
|
mei_cl_bus_dev_init(bus, me_cl);
|
up_read(&bus->me_clients_rwsem);
|
|
list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) {
|
|
if (!mei_me_cl_is_active(cldev->me_cl)) {
|
mei_cl_bus_remove_device(cldev);
|
continue;
|
}
|
|
if (cldev->is_added)
|
continue;
|
|
if (mei_cl_bus_dev_setup(bus, cldev))
|
mei_cl_bus_dev_add(cldev);
|
else {
|
list_del_init(&cldev->bus_list);
|
put_device(&cldev->dev);
|
}
|
}
|
mutex_unlock(&bus->cl_bus_lock);
|
|
dev_dbg(bus->dev, "rescan end");
|
}
|
|
void mei_cl_bus_rescan_work(struct work_struct *work)
|
{
|
struct mei_device *bus =
|
container_of(work, struct mei_device, bus_rescan_work);
|
|
mei_cl_bus_rescan(bus);
|
}
|
|
int __mei_cldev_driver_register(struct mei_cl_driver *cldrv,
|
struct module *owner)
|
{
|
int err;
|
|
cldrv->driver.name = cldrv->name;
|
cldrv->driver.owner = owner;
|
cldrv->driver.bus = &mei_cl_bus_type;
|
|
err = driver_register(&cldrv->driver);
|
if (err)
|
return err;
|
|
pr_debug("mei: driver [%s] registered\n", cldrv->driver.name);
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(__mei_cldev_driver_register);
|
|
void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv)
|
{
|
driver_unregister(&cldrv->driver);
|
|
pr_debug("mei: driver [%s] unregistered\n", cldrv->driver.name);
|
}
|
EXPORT_SYMBOL_GPL(mei_cldev_driver_unregister);
|
|
|
int __init mei_cl_bus_init(void)
|
{
|
return bus_register(&mei_cl_bus_type);
|
}
|
|
void __exit mei_cl_bus_exit(void)
|
{
|
bus_unregister(&mei_cl_bus_type);
|
}
|
