1034 lines
21 KiB
C
1034 lines
21 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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/**
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* __mei_cl_send - internal client send (write)
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*
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* @cl: host client
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* @buf: buffer to send
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* @length: buffer length
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* @blocking: wait for write completion
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*
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* Return: written size bytes or < 0 on error
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*/
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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 *bus;
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struct mei_cl_cb *cb;
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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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bus = cl->dev;
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mutex_lock(&bus->device_lock);
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if (bus->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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}
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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(&bus->device_lock);
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return rets;
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}
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/**
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* __mei_cl_recv - internal client receive (read)
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*
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* @cl: host client
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* @buf: buffer to receive
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* @length: buffer length
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*
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* Return: read size in bytes of < 0 on error
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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 *bus;
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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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bus = cl->dev;
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mutex_lock(&bus->device_lock);
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if (bus->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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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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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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/* wait on event only if there is no other waiter */
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/* synchronized under device mutex */
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if (!waitqueue_active(&cl->rx_wait)) {
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mutex_unlock(&bus->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(&bus->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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}
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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(&bus->device_lock);
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return rets;
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}
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/**
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* mei_cldev_send - me device send (write)
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*
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* @cldev: me client device
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* @buf: buffer to send
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* @length: buffer length
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*
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* Return: written size in bytes or < 0 on error
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*/
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ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
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{
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struct mei_cl *cl = cldev->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_cldev_send);
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/**
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* mei_cldev_recv - client receive (read)
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*
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* @cldev: me client device
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* @buf: buffer to receive
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* @length: buffer length
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*
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* Return: read size in bytes of < 0 on error
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*/
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ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
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{
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struct mei_cl *cl = cldev->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_cldev_recv);
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/**
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* mei_cl_bus_event_work - dispatch rx event for a bus device
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* and schedule new work
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*
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* @work: work
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*/
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static void mei_cl_bus_event_work(struct work_struct *work)
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{
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struct mei_cl_device *cldev;
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struct mei_device *bus;
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cldev = container_of(work, struct mei_cl_device, event_work);
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bus = cldev->bus;
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if (cldev->event_cb)
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cldev->event_cb(cldev, cldev->events, cldev->event_context);
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cldev->events = 0;
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/* Prepare for the next read */
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if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) {
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mutex_lock(&bus->device_lock);
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mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
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mutex_unlock(&bus->device_lock);
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}
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}
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/**
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* mei_cl_bus_notify_event - schedule notify cb on bus client
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*
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* @cl: host client
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*
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* Return: true if event was scheduled
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* false if the client is not waiting for event
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*/
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bool mei_cl_bus_notify_event(struct mei_cl *cl)
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{
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struct mei_cl_device *cldev = cl->cldev;
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if (!cldev || !cldev->event_cb)
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return false;
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if (!(cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)))
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return false;
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if (!cl->notify_ev)
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return false;
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set_bit(MEI_CL_EVENT_NOTIF, &cldev->events);
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schedule_work(&cldev->event_work);
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cl->notify_ev = false;
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return true;
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}
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/**
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* mei_cl_bus_rx_event - schedule rx event
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*
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* @cl: host client
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*
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* Return: true if event was scheduled
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* false if the client is not waiting for event
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*/
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bool mei_cl_bus_rx_event(struct mei_cl *cl)
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{
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struct mei_cl_device *cldev = cl->cldev;
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if (!cldev || !cldev->event_cb)
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return false;
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if (!(cldev->events_mask & BIT(MEI_CL_EVENT_RX)))
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return false;
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set_bit(MEI_CL_EVENT_RX, &cldev->events);
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schedule_work(&cldev->event_work);
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return true;
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}
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/**
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* mei_cldev_register_event_cb - register event callback
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*
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* @cldev: me client devices
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* @event_cb: callback function
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* @events_mask: requested events bitmask
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* @context: driver context data
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*
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* Return: 0 on success
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* -EALREADY if an callback is already registered
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* <0 on other errors
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*/
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int mei_cldev_register_event_cb(struct mei_cl_device *cldev,
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unsigned long events_mask,
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mei_cldev_event_cb_t event_cb, void *context)
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{
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struct mei_device *bus = cldev->bus;
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int ret;
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if (cldev->event_cb)
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return -EALREADY;
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cldev->events = 0;
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cldev->events_mask = events_mask;
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cldev->event_cb = event_cb;
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cldev->event_context = context;
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INIT_WORK(&cldev->event_work, mei_cl_bus_event_work);
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if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) {
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mutex_lock(&bus->device_lock);
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ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
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mutex_unlock(&bus->device_lock);
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if (ret && ret != -EBUSY)
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return ret;
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}
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if (cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)) {
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mutex_lock(&bus->device_lock);
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ret = mei_cl_notify_request(cldev->cl, NULL, event_cb ? 1 : 0);
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mutex_unlock(&bus->device_lock);
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if (ret)
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_cldev_register_event_cb);
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/**
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* mei_cldev_get_drvdata - driver data getter
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*
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* @cldev: mei client device
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*
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* Return: driver private data
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*/
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void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev)
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{
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return dev_get_drvdata(&cldev->dev);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_get_drvdata);
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/**
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* mei_cldev_set_drvdata - driver data setter
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*
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* @cldev: mei client device
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* @data: data to store
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*/
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void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data)
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{
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dev_set_drvdata(&cldev->dev, data);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_set_drvdata);
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/**
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* mei_cldev_uuid - return uuid of the underlying me client
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*
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* @cldev: mei client device
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*
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* Return: me client uuid
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*/
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const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev)
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{
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return mei_me_cl_uuid(cldev->me_cl);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_uuid);
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/**
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* mei_cldev_ver - return protocol version of the underlying me client
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*
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* @cldev: mei client device
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*
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* Return: me client protocol version
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*/
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u8 mei_cldev_ver(const struct mei_cl_device *cldev)
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{
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return mei_me_cl_ver(cldev->me_cl);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_ver);
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/**
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* mei_cldev_enabled - check whether the device is enabled
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*
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* @cldev: mei client device
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*
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* Return: true if me client is initialized and connected
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*/
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bool mei_cldev_enabled(struct mei_cl_device *cldev)
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{
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return cldev->cl && mei_cl_is_connected(cldev->cl);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_enabled);
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/**
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* mei_cldev_enable - enable me client device
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* create connection with me client
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*
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* @cldev: me client device
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*
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* Return: 0 on success and < 0 on error
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*/
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int mei_cldev_enable(struct mei_cl_device *cldev)
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{
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struct mei_device *bus = cldev->bus;
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struct mei_cl *cl;
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int ret;
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cl = cldev->cl;
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if (!cl) {
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mutex_lock(&bus->device_lock);
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cl = mei_cl_alloc_linked(bus);
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mutex_unlock(&bus->device_lock);
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if (IS_ERR(cl))
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return PTR_ERR(cl);
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/* update pointers */
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cldev->cl = cl;
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cl->cldev = cldev;
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}
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mutex_lock(&bus->device_lock);
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if (mei_cl_is_connected(cl)) {
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ret = 0;
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goto out;
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}
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if (!mei_me_cl_is_active(cldev->me_cl)) {
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dev_err(&cldev->dev, "me client is not active\n");
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ret = -ENOTTY;
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goto out;
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}
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ret = mei_cl_connect(cl, cldev->me_cl, NULL);
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if (ret < 0)
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dev_err(&cldev->dev, "cannot connect\n");
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out:
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mutex_unlock(&bus->device_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(mei_cldev_enable);
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/**
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* mei_cldev_disable - disable me client device
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* disconnect form the me client
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*
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* @cldev: me client device
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*
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* Return: 0 on success and < 0 on error
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*/
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int mei_cldev_disable(struct mei_cl_device *cldev)
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{
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struct mei_device *bus;
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struct mei_cl *cl;
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int err;
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if (!cldev || !cldev->cl)
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return -ENODEV;
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cl = cldev->cl;
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bus = cldev->bus;
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cldev->event_cb = NULL;
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|
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mutex_lock(&bus->device_lock);
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|
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if (!mei_cl_is_connected(cl)) {
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dev_err(bus->dev, "Already disconnected");
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err = 0;
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goto out;
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}
|
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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(bus->dev, "Could not disconnect from the ME client");
|
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|
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out:
|
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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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mei_cl_unlink(cl);
|
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|
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kfree(cl);
|
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cldev->cl = NULL;
|
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|
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mutex_unlock(&bus->device_lock);
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return err;
|
|
}
|
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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
|
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*
|
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* Return: id on success; NULL if no id is matching
|
|
*/
|
|
static const
|
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struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev,
|
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struct mei_cl_driver *cldrv)
|
|
{
|
|
const struct mei_cl_device_id *id;
|
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const uuid_le *uuid;
|
|
u8 version;
|
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bool match;
|
|
|
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uuid = mei_me_cl_uuid(cldev->me_cl);
|
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version = mei_me_cl_ver(cldev->me_cl);
|
|
|
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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;
|
|
|
|
ret = cldrv->probe(cldev, id);
|
|
if (ret)
|
|
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;
|
|
|
|
if (cldev->event_cb) {
|
|
cldev->event_cb = NULL;
|
|
cancel_work_sync(&cldev->event_work);
|
|
}
|
|
|
|
cldrv = to_mei_cl_driver(dev->driver);
|
|
if (cldrv->remove)
|
|
ret = cldrv->remove(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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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 struct attribute *mei_cldev_attrs[] = {
|
|
&dev_attr_name.attr,
|
|
&dev_attr_uuid.attr,
|
|
&dev_attr_version.attr,
|
|
&dev_attr_modalias.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);
|
|
kfree(cldev);
|
|
}
|
|
|
|
static 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;
|
|
|
|
cldev = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
|
|
if (!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);
|
|
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
|
|
*/
|
|
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);
|
|
struct mei_me_client *me_cl;
|
|
|
|
me_cl = mei_me_cl_by_uuid(bus, &mei_amthif_guid);
|
|
if (me_cl)
|
|
mei_amthif_host_init(bus, me_cl);
|
|
mei_me_cl_put(me_cl);
|
|
|
|
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);
|
|
}
|