564 lines
12 KiB
C
564 lines
12 KiB
C
/*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2012-2013, 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/module.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/interrupt.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 to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
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#define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
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static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
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{
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struct mei_cl_device *device = to_mei_cl_device(dev);
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struct mei_cl_driver *driver = to_mei_cl_driver(drv);
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const struct mei_cl_device_id *id;
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const uuid_le *uuid;
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const char *name;
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if (!device)
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return 0;
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uuid = mei_me_cl_uuid(device->me_cl);
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name = device->name;
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if (!driver || !driver->id_table)
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return 0;
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id = driver->id_table;
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while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) {
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if (!uuid_le_cmp(*uuid, id->uuid)) {
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if (id->name[0]) {
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if (!strncmp(name, id->name, sizeof(id->name)))
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return 1;
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} else {
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return 1;
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}
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}
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id++;
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}
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return 0;
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}
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static int mei_cl_device_probe(struct device *dev)
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{
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struct mei_cl_device *device = to_mei_cl_device(dev);
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struct mei_cl_driver *driver;
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struct mei_cl_device_id id;
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if (!device)
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return 0;
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driver = to_mei_cl_driver(dev->driver);
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if (!driver || !driver->probe)
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return -ENODEV;
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dev_dbg(dev, "Device probe\n");
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strlcpy(id.name, device->name, sizeof(id.name));
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return driver->probe(device, &id);
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}
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static int mei_cl_device_remove(struct device *dev)
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{
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struct mei_cl_device *device = to_mei_cl_device(dev);
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struct mei_cl_driver *driver;
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if (!device || !dev->driver)
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return 0;
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if (device->event_cb) {
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device->event_cb = NULL;
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cancel_work_sync(&device->event_work);
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}
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driver = to_mei_cl_driver(dev->driver);
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if (!driver->remove) {
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dev->driver = NULL;
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return 0;
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}
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return driver->remove(device);
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}
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static ssize_t name_show(struct device *dev, struct device_attribute *a,
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char *buf)
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{
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struct mei_cl_device *device = to_mei_cl_device(dev);
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size_t len;
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len = snprintf(buf, PAGE_SIZE, "%s", device->name);
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return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
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}
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static DEVICE_ATTR_RO(name);
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static ssize_t uuid_show(struct device *dev, struct device_attribute *a,
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char *buf)
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{
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struct mei_cl_device *device = to_mei_cl_device(dev);
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const uuid_le *uuid = mei_me_cl_uuid(device->me_cl);
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size_t len;
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len = snprintf(buf, PAGE_SIZE, "%pUl", uuid);
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return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
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}
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static DEVICE_ATTR_RO(uuid);
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static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
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char *buf)
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{
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struct mei_cl_device *device = to_mei_cl_device(dev);
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const uuid_le *uuid = mei_me_cl_uuid(device->me_cl);
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size_t len;
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len = snprintf(buf, PAGE_SIZE, "mei:%s:" MEI_CL_UUID_FMT ":",
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device->name, MEI_CL_UUID_ARGS(uuid->b));
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return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
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}
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static DEVICE_ATTR_RO(modalias);
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static struct attribute *mei_cl_dev_attrs[] = {
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&dev_attr_name.attr,
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&dev_attr_uuid.attr,
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&dev_attr_modalias.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(mei_cl_dev);
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static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct mei_cl_device *device = to_mei_cl_device(dev);
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const uuid_le *uuid = mei_me_cl_uuid(device->me_cl);
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if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid))
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return -ENOMEM;
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if (add_uevent_var(env, "MEI_CL_NAME=%s", device->name))
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return -ENOMEM;
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if (add_uevent_var(env, "MODALIAS=mei:%s:" MEI_CL_UUID_FMT ":",
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device->name, MEI_CL_UUID_ARGS(uuid->b)))
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return -ENOMEM;
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return 0;
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}
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static struct bus_type mei_cl_bus_type = {
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.name = "mei",
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.dev_groups = mei_cl_dev_groups,
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.match = mei_cl_device_match,
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.probe = mei_cl_device_probe,
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.remove = mei_cl_device_remove,
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.uevent = mei_cl_uevent,
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};
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static void mei_cl_dev_release(struct device *dev)
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{
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struct mei_cl_device *device = to_mei_cl_device(dev);
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if (!device)
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return;
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mei_me_cl_put(device->me_cl);
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kfree(device);
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}
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static struct device_type mei_cl_device_type = {
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.release = mei_cl_dev_release,
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};
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struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev,
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uuid_le uuid)
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{
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struct mei_cl *cl;
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list_for_each_entry(cl, &dev->device_list, device_link) {
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if (cl->device && cl->device->me_cl &&
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!uuid_le_cmp(uuid, *mei_me_cl_uuid(cl->device->me_cl)))
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return cl;
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}
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return NULL;
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}
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struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
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struct mei_me_client *me_cl,
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struct mei_cl *cl,
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char *name)
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{
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struct mei_cl_device *device;
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int status;
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device = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
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if (!device)
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return NULL;
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device->me_cl = mei_me_cl_get(me_cl);
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if (!device->me_cl) {
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kfree(device);
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return NULL;
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}
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device->cl = cl;
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device->dev.parent = dev->dev;
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device->dev.bus = &mei_cl_bus_type;
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device->dev.type = &mei_cl_device_type;
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strlcpy(device->name, name, sizeof(device->name));
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dev_set_name(&device->dev, "mei:%s:%pUl", name, mei_me_cl_uuid(me_cl));
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status = device_register(&device->dev);
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if (status) {
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dev_err(dev->dev, "Failed to register MEI device\n");
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mei_me_cl_put(device->me_cl);
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kfree(device);
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return NULL;
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}
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cl->device = device;
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dev_dbg(&device->dev, "client %s registered\n", name);
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return device;
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}
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EXPORT_SYMBOL_GPL(mei_cl_add_device);
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void mei_cl_remove_device(struct mei_cl_device *device)
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{
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device_unregister(&device->dev);
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}
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EXPORT_SYMBOL_GPL(mei_cl_remove_device);
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int __mei_cl_driver_register(struct mei_cl_driver *driver, struct module *owner)
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{
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int err;
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driver->driver.name = driver->name;
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driver->driver.owner = owner;
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driver->driver.bus = &mei_cl_bus_type;
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err = driver_register(&driver->driver);
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if (err)
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return err;
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pr_debug("mei: driver [%s] registered\n", driver->driver.name);
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return 0;
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}
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EXPORT_SYMBOL_GPL(__mei_cl_driver_register);
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void mei_cl_driver_unregister(struct mei_cl_driver *driver)
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{
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driver_unregister(&driver->driver);
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pr_debug("mei: driver [%s] unregistered\n", driver->driver.name);
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}
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EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
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ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
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bool blocking)
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{
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struct mei_device *dev;
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struct mei_cl_cb *cb = NULL;
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ssize_t rets;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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dev = cl->dev;
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mutex_lock(&dev->device_lock);
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if (!mei_cl_is_connected(cl)) {
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rets = -ENODEV;
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goto out;
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}
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/* Check if we have an ME client device */
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if (!mei_me_cl_is_active(cl->me_cl)) {
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rets = -ENOTTY;
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goto out;
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}
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if (length > mei_cl_mtu(cl)) {
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rets = -EFBIG;
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goto out;
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}
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cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
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if (!cb) {
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rets = -ENOMEM;
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goto out;
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}
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memcpy(cb->buf.data, buf, length);
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rets = mei_cl_write(cl, cb, blocking);
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out:
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mutex_unlock(&dev->device_lock);
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if (rets < 0)
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mei_io_cb_free(cb);
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return rets;
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}
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ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
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{
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struct mei_device *dev;
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struct mei_cl_cb *cb;
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size_t r_length;
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ssize_t rets;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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dev = cl->dev;
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mutex_lock(&dev->device_lock);
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cb = mei_cl_read_cb(cl, NULL);
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if (cb)
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goto copy;
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rets = mei_cl_read_start(cl, length, NULL);
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if (rets && rets != -EBUSY)
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goto out;
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if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) {
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mutex_unlock(&dev->device_lock);
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if (wait_event_interruptible(cl->rx_wait,
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(!list_empty(&cl->rd_completed)) ||
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(!mei_cl_is_connected(cl)))) {
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if (signal_pending(current))
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return -EINTR;
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return -ERESTARTSYS;
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}
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mutex_lock(&dev->device_lock);
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if (!mei_cl_is_connected(cl)) {
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rets = -EBUSY;
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goto out;
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}
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}
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cb = mei_cl_read_cb(cl, NULL);
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if (!cb) {
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rets = 0;
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goto out;
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}
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copy:
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if (cb->status) {
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rets = cb->status;
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goto free;
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}
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r_length = min_t(size_t, length, cb->buf_idx);
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memcpy(buf, cb->buf.data, r_length);
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rets = r_length;
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free:
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mei_io_cb_free(cb);
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out:
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mutex_unlock(&dev->device_lock);
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return rets;
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}
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ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
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{
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struct mei_cl *cl = device->cl;
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if (cl == NULL)
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return -ENODEV;
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return __mei_cl_send(cl, buf, length, 1);
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}
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EXPORT_SYMBOL_GPL(mei_cl_send);
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ssize_t mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length)
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{
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struct mei_cl *cl = device->cl;
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if (cl == NULL)
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return -ENODEV;
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return __mei_cl_recv(cl, buf, length);
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}
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EXPORT_SYMBOL_GPL(mei_cl_recv);
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static void mei_bus_event_work(struct work_struct *work)
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{
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struct mei_cl_device *device;
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device = container_of(work, struct mei_cl_device, event_work);
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if (device->event_cb)
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device->event_cb(device, device->events, device->event_context);
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device->events = 0;
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/* Prepare for the next read */
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mei_cl_read_start(device->cl, 0, NULL);
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}
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int mei_cl_register_event_cb(struct mei_cl_device *device,
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mei_cl_event_cb_t event_cb, void *context)
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{
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if (device->event_cb)
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return -EALREADY;
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device->events = 0;
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device->event_cb = event_cb;
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device->event_context = context;
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INIT_WORK(&device->event_work, mei_bus_event_work);
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mei_cl_read_start(device->cl, 0, NULL);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_cl_register_event_cb);
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void *mei_cl_get_drvdata(const struct mei_cl_device *device)
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{
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return dev_get_drvdata(&device->dev);
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}
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EXPORT_SYMBOL_GPL(mei_cl_get_drvdata);
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void mei_cl_set_drvdata(struct mei_cl_device *device, void *data)
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{
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dev_set_drvdata(&device->dev, data);
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}
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EXPORT_SYMBOL_GPL(mei_cl_set_drvdata);
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int mei_cl_enable_device(struct mei_cl_device *device)
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{
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int err;
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struct mei_device *dev;
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struct mei_cl *cl = device->cl;
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if (cl == NULL)
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return -ENODEV;
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dev = cl->dev;
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mutex_lock(&dev->device_lock);
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if (mei_cl_is_connected(cl)) {
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mutex_unlock(&dev->device_lock);
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dev_warn(dev->dev, "Already connected");
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return -EBUSY;
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}
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err = mei_cl_connect(cl, device->me_cl, NULL);
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if (err < 0) {
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mutex_unlock(&dev->device_lock);
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dev_err(dev->dev, "Could not connect to the ME client");
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return err;
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}
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mutex_unlock(&dev->device_lock);
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if (device->event_cb)
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mei_cl_read_start(device->cl, 0, NULL);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_cl_enable_device);
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int mei_cl_disable_device(struct mei_cl_device *device)
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{
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int err;
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struct mei_device *dev;
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struct mei_cl *cl = device->cl;
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if (cl == NULL)
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return -ENODEV;
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dev = cl->dev;
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device->event_cb = NULL;
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mutex_lock(&dev->device_lock);
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if (!mei_cl_is_connected(cl)) {
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dev_err(dev->dev, "Already disconnected");
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err = 0;
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goto out;
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}
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err = mei_cl_disconnect(cl);
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if (err < 0) {
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dev_err(dev->dev, "Could not disconnect from the ME client");
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goto out;
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}
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/* Flush queues and remove any pending read */
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mei_cl_flush_queues(cl, NULL);
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out:
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mutex_unlock(&dev->device_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(mei_cl_disable_device);
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void mei_cl_bus_rx_event(struct mei_cl *cl)
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{
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struct mei_cl_device *device = cl->device;
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if (!device || !device->event_cb)
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return;
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set_bit(MEI_CL_EVENT_RX, &device->events);
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schedule_work(&device->event_work);
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}
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int __init mei_cl_bus_init(void)
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{
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return bus_register(&mei_cl_bus_type);
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}
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void __exit mei_cl_bus_exit(void)
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{
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bus_unregister(&mei_cl_bus_type);
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}
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