![Tomas Winkler](/assets/img/avatar_default.png)
MEI bus was designed around nfc and was hard to extend. Instead of the hard coded way of adding the devices on the mei bus we scan the whole me client list and create a device for each eligible me client (mei_cl_bus_rescan); currently we support only clients with single connection and fixed address clients. NFC radio name detection is run as a fixup routine The patch replaces handling the device list based on struct me_cl to device list based on me_cl_devices. The creating a connection is pushed from the device creation time to device enablement. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
866 lines
18 KiB
C
866 lines
18 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 = 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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bus = cl->dev;
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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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/* 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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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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/**
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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 send
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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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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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if (list_empty(&cl->rd_completed) && !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 = -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(&bus->device_lock);
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return rets;
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}
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/**
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* mei_cl_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_cl_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_cl_send);
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/**
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* mei_cl_recv - client receive (read)
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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: read size in bytes of < 0 on error
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*/
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ssize_t mei_cl_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_cl_recv);
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/**
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* mei_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_bus_event_work(struct work_struct *work)
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{
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struct mei_cl_device *cldev;
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cldev = container_of(work, struct mei_cl_device, event_work);
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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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mei_cl_read_start(cldev->cl, 0, NULL);
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}
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/**
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* mei_cl_bus_rx_event - schedule rx evenet
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*
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* @cl: host client
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*/
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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 *cldev = cl->cldev;
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if (!cldev || !cldev->event_cb)
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return;
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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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}
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/**
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* mei_cl_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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* @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_cl_register_event_cb(struct mei_cl_device *cldev,
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mei_cl_event_cb_t event_cb, void *context)
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{
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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->event_cb = event_cb;
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cldev->event_context = context;
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INIT_WORK(&cldev->event_work, mei_bus_event_work);
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ret = mei_cl_read_start(cldev->cl, 0, NULL);
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if (ret && ret != -EBUSY)
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return ret;
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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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/**
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* mei_cl_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_cl_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_cl_get_drvdata);
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/**
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* mei_cl_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_cl_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_cl_set_drvdata);
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/**
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* mei_cl_enable_device - 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_cl_enable_device(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, MEI_HOST_CLIENT_ID_ANY);
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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_cl_enable_device);
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/**
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* mei_cl_disable_device - 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_cl_disable_device(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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mutex_lock(&bus->device_lock);
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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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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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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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kfree(cl);
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cldev->cl = NULL;
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mutex_unlock(&bus->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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/**
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* mei_cl_device_find - find matching entry in the driver id table
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*
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* @cldev: me client device
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* @cldrv: me client driver
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*
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* Return: id on success; NULL if no id is matching
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*/
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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)
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{
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const struct mei_cl_device_id *id;
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const uuid_le *uuid;
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uuid = mei_me_cl_uuid(cldev->me_cl);
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id = cldrv->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 (!cldev->name[0])
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return id;
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if (!strncmp(cldev->name, id->name, sizeof(id->name)))
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return id;
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}
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id++;
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}
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return NULL;
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}
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/**
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* mei_cl_device_match - device match function
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*
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* @dev: device
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* @drv: driver
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*
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* Return: 1 if matching device was found 0 otherwise
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*/
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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 *cldev = to_mei_cl_device(dev);
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struct mei_cl_driver *cldrv = to_mei_cl_driver(drv);
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const struct mei_cl_device_id *found_id;
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if (!cldev)
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return 0;
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if (!cldev->do_match)
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return 0;
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if (!cldrv || !cldrv->id_table)
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return 0;
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found_id = mei_cl_device_find(cldev, cldrv);
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if (found_id)
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return 1;
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return 0;
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}
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/**
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* mei_cl_device_probe - bus probe function
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*
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* @dev: device
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*
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* Return: 0 on success; < 0 otherwise
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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 *cldev;
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struct mei_cl_driver *cldrv;
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const struct mei_cl_device_id *id;
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cldev = to_mei_cl_device(dev);
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cldrv = to_mei_cl_driver(dev->driver);
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if (!cldev)
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return 0;
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if (!cldrv || !cldrv->probe)
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return -ENODEV;
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id = mei_cl_device_find(cldev, cldrv);
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if (!id)
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return -ENODEV;
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__module_get(THIS_MODULE);
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return cldrv->probe(cldev, id);
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}
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/**
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* mei_cl_device_remove - remove device from the bus
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*
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* @dev: device
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*
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* Return: 0 on success; < 0 otherwise
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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 *cldev = to_mei_cl_device(dev);
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struct mei_cl_driver *cldrv;
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int ret = 0;
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if (!cldev || !dev->driver)
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return 0;
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if (cldev->event_cb) {
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cldev->event_cb = NULL;
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cancel_work_sync(&cldev->event_work);
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}
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cldrv = to_mei_cl_driver(dev->driver);
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if (cldrv->remove)
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ret = cldrv->remove(cldev);
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module_put(THIS_MODULE);
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dev->driver = NULL;
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return ret;
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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 *cldev = to_mei_cl_device(dev);
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size_t len;
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len = snprintf(buf, PAGE_SIZE, "%s", cldev->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 *cldev = to_mei_cl_device(dev);
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const uuid_le *uuid = mei_me_cl_uuid(cldev->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)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
|
|
size_t len;
|
|
|
|
len = snprintf(buf, PAGE_SIZE, "mei:%s:" MEI_CL_UUID_FMT ":",
|
|
cldev->name, MEI_CL_UUID_ARGS(uuid->b));
|
|
|
|
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static struct attribute *mei_cl_dev_attrs[] = {
|
|
&dev_attr_name.attr,
|
|
&dev_attr_uuid.attr,
|
|
&dev_attr_modalias.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(mei_cl_dev);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
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:" MEI_CL_UUID_FMT ":",
|
|
cldev->name, MEI_CL_UUID_ARGS(uuid->b)))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct bus_type mei_cl_bus_type = {
|
|
.name = "mei",
|
|
.dev_groups = mei_cl_dev_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_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_dev_release,
|
|
};
|
|
|
|
/**
|
|
* mei_cl_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_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);
|
|
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_dev_setup(struct mei_device *bus,
|
|
struct mei_cl_device *cldev)
|
|
{
|
|
cldev->do_match = 1;
|
|
mei_cl_dev_fixup(cldev);
|
|
|
|
if (cldev->do_match)
|
|
dev_set_name(&cldev->dev, "mei:%s:%pUl",
|
|
cldev->name, mei_me_cl_uuid(cldev->me_cl));
|
|
|
|
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\n", mei_me_cl_uuid(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
|
|
*/
|
|
static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev)
|
|
{
|
|
if (!cldev->is_added)
|
|
return;
|
|
|
|
device_del(&cldev->dev);
|
|
|
|
mutex_lock(&cldev->bus->cl_bus_lock);
|
|
list_del_init(&cldev->bus_list);
|
|
mutex_unlock(&cldev->bus->cl_bus_lock);
|
|
|
|
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;
|
|
|
|
list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list)
|
|
mei_cl_bus_remove_device(cldev);
|
|
}
|
|
|
|
|
|
/**
|
|
* mei_cl_dev_init - allocate and initializes an mei client devices
|
|
* based on me client
|
|
*
|
|
* @bus: mei device
|
|
* @me_cl: me client
|
|
*/
|
|
static void mei_cl_dev_init(struct mei_device *bus, struct mei_me_client *me_cl)
|
|
{
|
|
struct mei_cl_device *cldev;
|
|
|
|
dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl));
|
|
|
|
if (me_cl->bus_added)
|
|
return;
|
|
|
|
cldev = mei_cl_dev_alloc(bus, me_cl);
|
|
if (!cldev)
|
|
return;
|
|
|
|
mutex_lock(&cldev->bus->cl_bus_lock);
|
|
me_cl->bus_added = true;
|
|
list_add_tail(&cldev->bus_list, &bus->device_list);
|
|
mutex_unlock(&cldev->bus->cl_bus_lock);
|
|
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
down_read(&bus->me_clients_rwsem);
|
|
list_for_each_entry(me_cl, &bus->me_clients, list)
|
|
mei_cl_dev_init(bus, me_cl);
|
|
up_read(&bus->me_clients_rwsem);
|
|
|
|
mutex_lock(&bus->cl_bus_lock);
|
|
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_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");
|
|
}
|
|
|
|
int __mei_cl_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_cl_driver_register);
|
|
|
|
void mei_cl_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_cl_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);
|
|
}
|