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/*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2012-2013, 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/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/mei_cl_bus.h>
#include "mei_dev.h"
#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
#define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
{
struct mei_cl_device *device = to_mei_cl_device(dev);
struct mei_cl_driver *driver = to_mei_cl_driver(drv);
const struct mei_cl_device_id *id;
if (!device)
return 0;
if (!driver || !driver->id_table)
return 0;
id = driver->id_table;
while (id->name[0]) {
if (!strcmp(dev_name(dev), id->name))
return 1;
id++;
}
return 0;
}
static int mei_cl_device_probe(struct device *dev)
{
struct mei_cl_device *device = to_mei_cl_device(dev);
struct mei_cl_driver *driver;
struct mei_cl_device_id id;
if (!device)
return 0;
driver = to_mei_cl_driver(dev->driver);
if (!driver || !driver->probe)
return -ENODEV;
dev_dbg(dev, "Device probe\n");
strncpy(id.name, dev_name(dev), MEI_CL_NAME_SIZE);
return driver->probe(device, &id);
}
static int mei_cl_device_remove(struct device *dev)
{
struct mei_cl_device *device = to_mei_cl_device(dev);
struct mei_cl_driver *driver;
if (!device || !dev->driver)
return 0;
driver = to_mei_cl_driver(dev->driver);
if (!driver->remove) {
dev->driver = NULL;
return 0;
}
return driver->remove(device);
}
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
char *buf)
{
int len;
len = snprintf(buf, PAGE_SIZE, "mei:%s\n", dev_name(dev));
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
}
static struct device_attribute mei_cl_dev_attrs[] = {
__ATTR_RO(modalias),
__ATTR_NULL,
};
static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
{
if (add_uevent_var(env, "MODALIAS=mei:%s", dev_name(dev)))
return -ENOMEM;
return 0;
}
static struct bus_type mei_cl_bus_type = {
.name = "mei",
.dev_attrs = mei_cl_dev_attrs,
.match = mei_cl_device_match,
.probe = mei_cl_device_probe,
.remove = mei_cl_device_remove,
.uevent = mei_cl_uevent,
};
static void mei_cl_dev_release(struct device *dev)
{
kfree(to_mei_cl_device(dev));
}
static struct device_type mei_cl_device_type = {
.release = mei_cl_dev_release,
};
struct mei_cl_device *mei_cl_add_device(struct mei_device *mei_device,
uuid_le uuid, char *name)
{
struct mei_cl_device *device;
int status;
device = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
if (!device)
return NULL;
device->dev.parent = &mei_device->pdev->dev;
device->dev.bus = &mei_cl_bus_type;
device->dev.type = &mei_cl_device_type;
dev_set_name(&device->dev, "%s", name);
status = device_register(&device->dev);
if (status)
goto out_err;
dev_dbg(&device->dev, "client %s registered\n", name);
return device;
out_err:
dev_err(device->dev.parent, "Failed to register MEI client\n");
kfree(device);
return NULL;
}
EXPORT_SYMBOL_GPL(mei_cl_add_device);
void mei_cl_remove_device(struct mei_cl_device *device)
{
device_unregister(&device->dev);
}
EXPORT_SYMBOL_GPL(mei_cl_remove_device);
int __mei_cl_driver_register(struct mei_cl_driver *driver, struct module *owner)
{
int err;
driver->driver.name = driver->name;
driver->driver.owner = owner;
driver->driver.bus = &mei_cl_bus_type;
err = driver_register(&driver->driver);
if (err)
return err;
pr_debug("mei: driver [%s] registered\n", driver->driver.name);
return 0;
}
EXPORT_SYMBOL_GPL(__mei_cl_driver_register);
void mei_cl_driver_unregister(struct mei_cl_driver *driver)
{
driver_unregister(&driver->driver);
pr_debug("mei: driver [%s] unregistered\n", driver->driver.name);
}
EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
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