2 * Intel Management Engine Interface (Intel MEI) Linux driver
3 * Copyright (c) 2012-2013, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 #include <linux/module.h>
17 #include <linux/device.h>
18 #include <linux/kernel.h>
19 #include <linux/sched/signal.h>
20 #include <linux/init.h>
21 #include <linux/errno.h>
22 #include <linux/slab.h>
23 #include <linux/mutex.h>
24 #include <linux/interrupt.h>
25 #include <linux/mei_cl_bus.h>
30 #define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
31 #define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
34 * __mei_cl_send - internal client send (write)
37 * @buf: buffer to send
38 * @length: buffer length
41 * Return: written size bytes or < 0 on error
43 ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
46 struct mei_device *bus;
50 if (WARN_ON(!cl || !cl->dev))
55 mutex_lock(&bus->device_lock);
56 if (bus->dev_state != MEI_DEV_ENABLED) {
61 if (!mei_cl_is_connected(cl)) {
66 /* Check if we have an ME client device */
67 if (!mei_me_cl_is_active(cl->me_cl)) {
72 if (length > mei_cl_mtu(cl)) {
77 while (cl->tx_cb_queued >= bus->tx_queue_limit) {
78 mutex_unlock(&bus->device_lock);
79 rets = wait_event_interruptible(cl->tx_wait,
80 cl->writing_state == MEI_WRITE_COMPLETE ||
81 (!mei_cl_is_connected(cl)));
82 mutex_lock(&bus->device_lock);
84 if (signal_pending(current))
88 if (!mei_cl_is_connected(cl)) {
94 cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
100 cb->internal = !!(mode & MEI_CL_IO_TX_INTERNAL);
101 cb->blocking = !!(mode & MEI_CL_IO_TX_BLOCKING);
102 memcpy(cb->buf.data, buf, length);
104 rets = mei_cl_write(cl, cb);
107 mutex_unlock(&bus->device_lock);
113 * __mei_cl_recv - internal client receive (read)
116 * @buf: buffer to receive
117 * @length: buffer length
119 * @timeout: recv timeout, 0 for infinite timeout
121 * Return: read size in bytes of < 0 on error
123 ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length,
124 unsigned int mode, unsigned long timeout)
126 struct mei_device *bus;
127 struct mei_cl_cb *cb;
130 bool nonblock = !!(mode & MEI_CL_IO_RX_NONBLOCK);
132 if (WARN_ON(!cl || !cl->dev))
137 mutex_lock(&bus->device_lock);
138 if (bus->dev_state != MEI_DEV_ENABLED) {
143 cb = mei_cl_read_cb(cl, NULL);
147 rets = mei_cl_read_start(cl, length, NULL);
148 if (rets && rets != -EBUSY)
156 /* wait on event only if there is no other waiter */
157 /* synchronized under device mutex */
158 if (!waitqueue_active(&cl->rx_wait)) {
160 mutex_unlock(&bus->device_lock);
163 rets = wait_event_interruptible_timeout
165 (!list_empty(&cl->rd_completed)) ||
166 (!mei_cl_is_connected(cl)),
167 msecs_to_jiffies(timeout));
171 if (signal_pending(current))
176 if (wait_event_interruptible
178 (!list_empty(&cl->rd_completed)) ||
179 (!mei_cl_is_connected(cl)))) {
180 if (signal_pending(current))
186 mutex_lock(&bus->device_lock);
188 if (!mei_cl_is_connected(cl)) {
194 cb = mei_cl_read_cb(cl, NULL);
206 r_length = min_t(size_t, length, cb->buf_idx);
207 memcpy(buf, cb->buf.data, r_length);
213 mutex_unlock(&bus->device_lock);
219 * mei_cldev_send - me device send (write)
221 * @cldev: me client device
222 * @buf: buffer to send
223 * @length: buffer length
225 * Return: written size in bytes or < 0 on error
227 ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
229 struct mei_cl *cl = cldev->cl;
231 return __mei_cl_send(cl, buf, length, MEI_CL_IO_TX_BLOCKING);
233 EXPORT_SYMBOL_GPL(mei_cldev_send);
236 * mei_cldev_recv_nonblock - non block client receive (read)
238 * @cldev: me client device
239 * @buf: buffer to receive
240 * @length: buffer length
242 * Return: read size in bytes of < 0 on error
243 * -EAGAIN if function will block.
245 ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
248 struct mei_cl *cl = cldev->cl;
250 return __mei_cl_recv(cl, buf, length, MEI_CL_IO_RX_NONBLOCK, 0);
252 EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
255 * mei_cldev_recv - client receive (read)
257 * @cldev: me client device
258 * @buf: buffer to receive
259 * @length: buffer length
261 * Return: read size in bytes of < 0 on error
263 ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
265 struct mei_cl *cl = cldev->cl;
267 return __mei_cl_recv(cl, buf, length, 0, 0);
269 EXPORT_SYMBOL_GPL(mei_cldev_recv);
272 * mei_cl_bus_rx_work - dispatch rx event for a bus device
276 static void mei_cl_bus_rx_work(struct work_struct *work)
278 struct mei_cl_device *cldev;
279 struct mei_device *bus;
281 cldev = container_of(work, struct mei_cl_device, rx_work);
288 mutex_lock(&bus->device_lock);
289 mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
290 mutex_unlock(&bus->device_lock);
294 * mei_cl_bus_notif_work - dispatch FW notif event for a bus device
298 static void mei_cl_bus_notif_work(struct work_struct *work)
300 struct mei_cl_device *cldev;
302 cldev = container_of(work, struct mei_cl_device, notif_work);
305 cldev->notif_cb(cldev);
309 * mei_cl_bus_notify_event - schedule notify cb on bus client
313 * Return: true if event was scheduled
314 * false if the client is not waiting for event
316 bool mei_cl_bus_notify_event(struct mei_cl *cl)
318 struct mei_cl_device *cldev = cl->cldev;
320 if (!cldev || !cldev->notif_cb)
326 schedule_work(&cldev->notif_work);
328 cl->notify_ev = false;
334 * mei_cl_bus_rx_event - schedule rx event
338 * Return: true if event was scheduled
339 * false if the client is not waiting for event
341 bool mei_cl_bus_rx_event(struct mei_cl *cl)
343 struct mei_cl_device *cldev = cl->cldev;
345 if (!cldev || !cldev->rx_cb)
348 schedule_work(&cldev->rx_work);
354 * mei_cldev_register_rx_cb - register Rx event callback
356 * @cldev: me client devices
357 * @rx_cb: callback function
359 * Return: 0 on success
360 * -EALREADY if an callback is already registered
363 int mei_cldev_register_rx_cb(struct mei_cl_device *cldev, mei_cldev_cb_t rx_cb)
365 struct mei_device *bus = cldev->bus;
373 cldev->rx_cb = rx_cb;
374 INIT_WORK(&cldev->rx_work, mei_cl_bus_rx_work);
376 mutex_lock(&bus->device_lock);
377 ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
378 mutex_unlock(&bus->device_lock);
379 if (ret && ret != -EBUSY)
384 EXPORT_SYMBOL_GPL(mei_cldev_register_rx_cb);
387 * mei_cldev_register_notif_cb - register FW notification event callback
389 * @cldev: me client devices
390 * @notif_cb: callback function
392 * Return: 0 on success
393 * -EALREADY if an callback is already registered
396 int mei_cldev_register_notif_cb(struct mei_cl_device *cldev,
397 mei_cldev_cb_t notif_cb)
399 struct mei_device *bus = cldev->bus;
408 cldev->notif_cb = notif_cb;
409 INIT_WORK(&cldev->notif_work, mei_cl_bus_notif_work);
411 mutex_lock(&bus->device_lock);
412 ret = mei_cl_notify_request(cldev->cl, NULL, 1);
413 mutex_unlock(&bus->device_lock);
419 EXPORT_SYMBOL_GPL(mei_cldev_register_notif_cb);
422 * mei_cldev_get_drvdata - driver data getter
424 * @cldev: mei client device
426 * Return: driver private data
428 void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev)
430 return dev_get_drvdata(&cldev->dev);
432 EXPORT_SYMBOL_GPL(mei_cldev_get_drvdata);
435 * mei_cldev_set_drvdata - driver data setter
437 * @cldev: mei client device
438 * @data: data to store
440 void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data)
442 dev_set_drvdata(&cldev->dev, data);
444 EXPORT_SYMBOL_GPL(mei_cldev_set_drvdata);
447 * mei_cldev_uuid - return uuid of the underlying me client
449 * @cldev: mei client device
451 * Return: me client uuid
453 const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev)
455 return mei_me_cl_uuid(cldev->me_cl);
457 EXPORT_SYMBOL_GPL(mei_cldev_uuid);
460 * mei_cldev_ver - return protocol version of the underlying me client
462 * @cldev: mei client device
464 * Return: me client protocol version
466 u8 mei_cldev_ver(const struct mei_cl_device *cldev)
468 return mei_me_cl_ver(cldev->me_cl);
470 EXPORT_SYMBOL_GPL(mei_cldev_ver);
473 * mei_cldev_enabled - check whether the device is enabled
475 * @cldev: mei client device
477 * Return: true if me client is initialized and connected
479 bool mei_cldev_enabled(struct mei_cl_device *cldev)
481 return mei_cl_is_connected(cldev->cl);
483 EXPORT_SYMBOL_GPL(mei_cldev_enabled);
486 * mei_cl_bus_module_get - acquire module of the underlying
489 * @cldev: mei client device
491 * Return: true on success; false if the module was removed.
493 static bool mei_cl_bus_module_get(struct mei_cl_device *cldev)
495 return try_module_get(cldev->bus->dev->driver->owner);
499 * mei_cl_bus_module_put - release the underlying hw module.
501 * @cldev: mei client device
503 static void mei_cl_bus_module_put(struct mei_cl_device *cldev)
505 module_put(cldev->bus->dev->driver->owner);
509 * mei_cldev_enable - enable me client device
510 * create connection with me client
512 * @cldev: me client device
514 * Return: 0 on success and < 0 on error
516 int mei_cldev_enable(struct mei_cl_device *cldev)
518 struct mei_device *bus = cldev->bus;
524 mutex_lock(&bus->device_lock);
525 if (cl->state == MEI_FILE_UNINITIALIZED) {
526 ret = mei_cl_link(cl);
529 /* update pointers */
533 if (mei_cl_is_connected(cl)) {
538 if (!mei_me_cl_is_active(cldev->me_cl)) {
539 dev_err(&cldev->dev, "me client is not active\n");
544 ret = mei_cl_connect(cl, cldev->me_cl, NULL);
546 dev_err(&cldev->dev, "cannot connect\n");
549 mutex_unlock(&bus->device_lock);
553 EXPORT_SYMBOL_GPL(mei_cldev_enable);
556 * mei_cldev_unregister_callbacks - internal wrapper for unregistering
559 * @cldev: client device
561 static void mei_cldev_unregister_callbacks(struct mei_cl_device *cldev)
564 cancel_work_sync(&cldev->rx_work);
568 if (cldev->notif_cb) {
569 cancel_work_sync(&cldev->notif_work);
570 cldev->notif_cb = NULL;
575 * mei_cldev_disable - disable me client device
576 * disconnect form the me client
578 * @cldev: me client device
580 * Return: 0 on success and < 0 on error
582 int mei_cldev_disable(struct mei_cl_device *cldev)
584 struct mei_device *bus;
595 mei_cldev_unregister_callbacks(cldev);
597 mutex_lock(&bus->device_lock);
599 if (!mei_cl_is_connected(cl)) {
600 dev_dbg(bus->dev, "Already disconnected\n");
605 err = mei_cl_disconnect(cl);
607 dev_err(bus->dev, "Could not disconnect from the ME client\n");
610 /* Flush queues and remove any pending read */
611 mei_cl_flush_queues(cl, NULL);
614 mutex_unlock(&bus->device_lock);
617 EXPORT_SYMBOL_GPL(mei_cldev_disable);
620 * mei_cl_device_find - find matching entry in the driver id table
622 * @cldev: me client device
623 * @cldrv: me client driver
625 * Return: id on success; NULL if no id is matching
628 struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev,
629 struct mei_cl_driver *cldrv)
631 const struct mei_cl_device_id *id;
636 uuid = mei_me_cl_uuid(cldev->me_cl);
637 version = mei_me_cl_ver(cldev->me_cl);
639 id = cldrv->id_table;
640 while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) {
641 if (!uuid_le_cmp(*uuid, id->uuid)) {
645 if (strncmp(cldev->name, id->name,
649 if (id->version != MEI_CL_VERSION_ANY)
650 if (id->version != version)
663 * mei_cl_device_match - device match function
668 * Return: 1 if matching device was found 0 otherwise
670 static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
672 struct mei_cl_device *cldev = to_mei_cl_device(dev);
673 struct mei_cl_driver *cldrv = to_mei_cl_driver(drv);
674 const struct mei_cl_device_id *found_id;
679 if (!cldev->do_match)
682 if (!cldrv || !cldrv->id_table)
685 found_id = mei_cl_device_find(cldev, cldrv);
693 * mei_cl_device_probe - bus probe function
697 * Return: 0 on success; < 0 otherwise
699 static int mei_cl_device_probe(struct device *dev)
701 struct mei_cl_device *cldev;
702 struct mei_cl_driver *cldrv;
703 const struct mei_cl_device_id *id;
706 cldev = to_mei_cl_device(dev);
707 cldrv = to_mei_cl_driver(dev->driver);
712 if (!cldrv || !cldrv->probe)
715 id = mei_cl_device_find(cldev, cldrv);
719 if (!mei_cl_bus_module_get(cldev)) {
720 dev_err(&cldev->dev, "get hw module failed");
724 ret = cldrv->probe(cldev, id);
726 mei_cl_bus_module_put(cldev);
730 __module_get(THIS_MODULE);
735 * mei_cl_device_remove - remove device from the bus
739 * Return: 0 on success; < 0 otherwise
741 static int mei_cl_device_remove(struct device *dev)
743 struct mei_cl_device *cldev = to_mei_cl_device(dev);
744 struct mei_cl_driver *cldrv;
747 if (!cldev || !dev->driver)
750 cldrv = to_mei_cl_driver(dev->driver);
752 ret = cldrv->remove(cldev);
754 mei_cldev_unregister_callbacks(cldev);
756 mei_cl_bus_module_put(cldev);
757 module_put(THIS_MODULE);
762 static ssize_t name_show(struct device *dev, struct device_attribute *a,
765 struct mei_cl_device *cldev = to_mei_cl_device(dev);
767 return scnprintf(buf, PAGE_SIZE, "%s", cldev->name);
769 static DEVICE_ATTR_RO(name);
771 static ssize_t uuid_show(struct device *dev, struct device_attribute *a,
774 struct mei_cl_device *cldev = to_mei_cl_device(dev);
775 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
777 return scnprintf(buf, PAGE_SIZE, "%pUl", uuid);
779 static DEVICE_ATTR_RO(uuid);
781 static ssize_t version_show(struct device *dev, struct device_attribute *a,
784 struct mei_cl_device *cldev = to_mei_cl_device(dev);
785 u8 version = mei_me_cl_ver(cldev->me_cl);
787 return scnprintf(buf, PAGE_SIZE, "%02X", version);
789 static DEVICE_ATTR_RO(version);
791 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
794 struct mei_cl_device *cldev = to_mei_cl_device(dev);
795 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
796 u8 version = mei_me_cl_ver(cldev->me_cl);
798 return scnprintf(buf, PAGE_SIZE, "mei:%s:%pUl:%02X:",
799 cldev->name, uuid, version);
801 static DEVICE_ATTR_RO(modalias);
803 static struct attribute *mei_cldev_attrs[] = {
806 &dev_attr_version.attr,
807 &dev_attr_modalias.attr,
810 ATTRIBUTE_GROUPS(mei_cldev);
813 * mei_cl_device_uevent - me client bus uevent handler
816 * @env: uevent kobject
818 * Return: 0 on success -ENOMEM on when add_uevent_var fails
820 static int mei_cl_device_uevent(struct device *dev, struct kobj_uevent_env *env)
822 struct mei_cl_device *cldev = to_mei_cl_device(dev);
823 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
824 u8 version = mei_me_cl_ver(cldev->me_cl);
826 if (add_uevent_var(env, "MEI_CL_VERSION=%d", version))
829 if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid))
832 if (add_uevent_var(env, "MEI_CL_NAME=%s", cldev->name))
835 if (add_uevent_var(env, "MODALIAS=mei:%s:%pUl:%02X:",
836 cldev->name, uuid, version))
842 static struct bus_type mei_cl_bus_type = {
844 .dev_groups = mei_cldev_groups,
845 .match = mei_cl_device_match,
846 .probe = mei_cl_device_probe,
847 .remove = mei_cl_device_remove,
848 .uevent = mei_cl_device_uevent,
851 static struct mei_device *mei_dev_bus_get(struct mei_device *bus)
854 get_device(bus->dev);
859 static void mei_dev_bus_put(struct mei_device *bus)
862 put_device(bus->dev);
865 static void mei_cl_bus_dev_release(struct device *dev)
867 struct mei_cl_device *cldev = to_mei_cl_device(dev);
872 mei_me_cl_put(cldev->me_cl);
873 mei_dev_bus_put(cldev->bus);
874 mei_cl_unlink(cldev->cl);
879 static const struct device_type mei_cl_device_type = {
880 .release = mei_cl_bus_dev_release,
884 * mei_cl_bus_set_name - set device name for me client device
885 * <controller>-<client device>
886 * Example: 0000:00:16.0-55213584-9a29-4916-badf-0fb7ed682aeb
888 * @cldev: me client device
890 static inline void mei_cl_bus_set_name(struct mei_cl_device *cldev)
892 dev_set_name(&cldev->dev, "%s-%pUl",
893 dev_name(cldev->bus->dev),
894 mei_me_cl_uuid(cldev->me_cl));
898 * mei_cl_bus_dev_alloc - initialize and allocate mei client device
903 * Return: allocated device structur or NULL on allocation failure
905 static struct mei_cl_device *mei_cl_bus_dev_alloc(struct mei_device *bus,
906 struct mei_me_client *me_cl)
908 struct mei_cl_device *cldev;
911 cldev = kzalloc(sizeof(struct mei_cl_device), GFP_KERNEL);
915 cl = mei_cl_allocate(bus);
921 device_initialize(&cldev->dev);
922 cldev->dev.parent = bus->dev;
923 cldev->dev.bus = &mei_cl_bus_type;
924 cldev->dev.type = &mei_cl_device_type;
925 cldev->bus = mei_dev_bus_get(bus);
926 cldev->me_cl = mei_me_cl_get(me_cl);
928 mei_cl_bus_set_name(cldev);
930 INIT_LIST_HEAD(&cldev->bus_list);
936 * mei_cl_dev_setup - setup me client device
937 * run fix up routines and set the device name
940 * @cldev: me client device
942 * Return: true if the device is eligible for enumeration
944 static bool mei_cl_bus_dev_setup(struct mei_device *bus,
945 struct mei_cl_device *cldev)
948 mei_cl_bus_dev_fixup(cldev);
950 /* the device name can change during fix up */
952 mei_cl_bus_set_name(cldev);
954 return cldev->do_match == 1;
958 * mei_cl_bus_dev_add - add me client devices
960 * @cldev: me client device
962 * Return: 0 on success; < 0 on failre
964 static int mei_cl_bus_dev_add(struct mei_cl_device *cldev)
968 dev_dbg(cldev->bus->dev, "adding %pUL:%02X\n",
969 mei_me_cl_uuid(cldev->me_cl),
970 mei_me_cl_ver(cldev->me_cl));
971 ret = device_add(&cldev->dev);
979 * mei_cl_bus_dev_stop - stop the driver
981 * @cldev: me client device
983 static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev)
986 device_release_driver(&cldev->dev);
990 * mei_cl_bus_dev_destroy - destroy me client devices object
992 * @cldev: me client device
994 * Locking: called under "dev->cl_bus_lock" lock
996 static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev)
999 WARN_ON(!mutex_is_locked(&cldev->bus->cl_bus_lock));
1001 if (!cldev->is_added)
1004 device_del(&cldev->dev);
1006 list_del_init(&cldev->bus_list);
1008 cldev->is_added = 0;
1009 put_device(&cldev->dev);
1013 * mei_cl_bus_remove_device - remove a devices form the bus
1015 * @cldev: me client device
1017 static void mei_cl_bus_remove_device(struct mei_cl_device *cldev)
1019 mei_cl_bus_dev_stop(cldev);
1020 mei_cl_bus_dev_destroy(cldev);
1024 * mei_cl_bus_remove_devices - remove all devices form the bus
1028 void mei_cl_bus_remove_devices(struct mei_device *bus)
1030 struct mei_cl_device *cldev, *next;
1032 mutex_lock(&bus->cl_bus_lock);
1033 list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list)
1034 mei_cl_bus_remove_device(cldev);
1035 mutex_unlock(&bus->cl_bus_lock);
1040 * mei_cl_bus_dev_init - allocate and initializes an mei client devices
1041 * based on me client
1046 * Locking: called under "dev->cl_bus_lock" lock
1048 static void mei_cl_bus_dev_init(struct mei_device *bus,
1049 struct mei_me_client *me_cl)
1051 struct mei_cl_device *cldev;
1053 WARN_ON(!mutex_is_locked(&bus->cl_bus_lock));
1055 dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl));
1057 if (me_cl->bus_added)
1060 cldev = mei_cl_bus_dev_alloc(bus, me_cl);
1064 me_cl->bus_added = true;
1065 list_add_tail(&cldev->bus_list, &bus->device_list);
1070 * mei_cl_bus_rescan - scan me clients list and add create
1071 * devices for eligible clients
1075 static void mei_cl_bus_rescan(struct mei_device *bus)
1077 struct mei_cl_device *cldev, *n;
1078 struct mei_me_client *me_cl;
1080 mutex_lock(&bus->cl_bus_lock);
1082 down_read(&bus->me_clients_rwsem);
1083 list_for_each_entry(me_cl, &bus->me_clients, list)
1084 mei_cl_bus_dev_init(bus, me_cl);
1085 up_read(&bus->me_clients_rwsem);
1087 list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) {
1089 if (!mei_me_cl_is_active(cldev->me_cl)) {
1090 mei_cl_bus_remove_device(cldev);
1094 if (cldev->is_added)
1097 if (mei_cl_bus_dev_setup(bus, cldev))
1098 mei_cl_bus_dev_add(cldev);
1100 list_del_init(&cldev->bus_list);
1101 put_device(&cldev->dev);
1104 mutex_unlock(&bus->cl_bus_lock);
1106 dev_dbg(bus->dev, "rescan end");
1109 void mei_cl_bus_rescan_work(struct work_struct *work)
1111 struct mei_device *bus =
1112 container_of(work, struct mei_device, bus_rescan_work);
1114 mei_cl_bus_rescan(bus);
1117 int __mei_cldev_driver_register(struct mei_cl_driver *cldrv,
1118 struct module *owner)
1122 cldrv->driver.name = cldrv->name;
1123 cldrv->driver.owner = owner;
1124 cldrv->driver.bus = &mei_cl_bus_type;
1126 err = driver_register(&cldrv->driver);
1130 pr_debug("mei: driver [%s] registered\n", cldrv->driver.name);
1134 EXPORT_SYMBOL_GPL(__mei_cldev_driver_register);
1136 void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv)
1138 driver_unregister(&cldrv->driver);
1140 pr_debug("mei: driver [%s] unregistered\n", cldrv->driver.name);
1142 EXPORT_SYMBOL_GPL(mei_cldev_driver_unregister);
1145 int __init mei_cl_bus_init(void)
1147 return bus_register(&mei_cl_bus_type);
1150 void __exit mei_cl_bus_exit(void)
1152 bus_unregister(&mei_cl_bus_type);