1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2012-2019, Intel Corporation. All rights reserved.
4 * Intel Management Engine Interface (Intel MEI) Linux driver
7 #include <linux/module.h>
8 #include <linux/device.h>
9 #include <linux/kernel.h>
10 #include <linux/sched/signal.h>
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/slab.h>
14 #include <linux/mutex.h>
15 #include <linux/interrupt.h>
16 #include <linux/mei_cl_bus.h>
21 #define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
24 * __mei_cl_send - internal client send (write)
27 * @buf: buffer to send
28 * @length: buffer length
31 * Return: written size bytes or < 0 on error
33 ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
36 struct mei_device *bus;
40 if (WARN_ON(!cl || !cl->dev))
45 mutex_lock(&bus->device_lock);
46 if (bus->dev_state != MEI_DEV_ENABLED) {
51 if (!mei_cl_is_connected(cl)) {
56 /* Check if we have an ME client device */
57 if (!mei_me_cl_is_active(cl->me_cl)) {
62 if (length > mei_cl_mtu(cl)) {
67 while (cl->tx_cb_queued >= bus->tx_queue_limit) {
68 mutex_unlock(&bus->device_lock);
69 rets = wait_event_interruptible(cl->tx_wait,
70 cl->writing_state == MEI_WRITE_COMPLETE ||
71 (!mei_cl_is_connected(cl)));
72 mutex_lock(&bus->device_lock);
74 if (signal_pending(current))
78 if (!mei_cl_is_connected(cl)) {
84 cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
90 cb->internal = !!(mode & MEI_CL_IO_TX_INTERNAL);
91 cb->blocking = !!(mode & MEI_CL_IO_TX_BLOCKING);
92 memcpy(cb->buf.data, buf, length);
94 rets = mei_cl_write(cl, cb);
97 mutex_unlock(&bus->device_lock);
103 * __mei_cl_recv - internal client receive (read)
106 * @buf: buffer to receive
107 * @length: buffer length
109 * @timeout: recv timeout, 0 for infinite timeout
111 * Return: read size in bytes of < 0 on error
113 ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length,
114 unsigned int mode, unsigned long timeout)
116 struct mei_device *bus;
117 struct mei_cl_cb *cb;
120 bool nonblock = !!(mode & MEI_CL_IO_RX_NONBLOCK);
122 if (WARN_ON(!cl || !cl->dev))
127 mutex_lock(&bus->device_lock);
128 if (bus->dev_state != MEI_DEV_ENABLED) {
133 cb = mei_cl_read_cb(cl, NULL);
137 rets = mei_cl_read_start(cl, length, NULL);
138 if (rets && rets != -EBUSY)
146 /* wait on event only if there is no other waiter */
147 /* synchronized under device mutex */
148 if (!waitqueue_active(&cl->rx_wait)) {
150 mutex_unlock(&bus->device_lock);
153 rets = wait_event_interruptible_timeout
155 mei_cl_read_cb(cl, NULL) ||
156 (!mei_cl_is_connected(cl)),
157 msecs_to_jiffies(timeout));
161 if (signal_pending(current))
166 if (wait_event_interruptible
168 mei_cl_read_cb(cl, NULL) ||
169 (!mei_cl_is_connected(cl)))) {
170 if (signal_pending(current))
176 mutex_lock(&bus->device_lock);
178 if (!mei_cl_is_connected(cl)) {
184 cb = mei_cl_read_cb(cl, NULL);
196 r_length = min_t(size_t, length, cb->buf_idx);
197 memcpy(buf, cb->buf.data, r_length);
201 mei_cl_del_rd_completed(cl, cb);
203 mutex_unlock(&bus->device_lock);
209 * mei_cldev_send - me device send (write)
211 * @cldev: me client device
212 * @buf: buffer to send
213 * @length: buffer length
215 * Return: written size in bytes or < 0 on error
217 ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
219 struct mei_cl *cl = cldev->cl;
221 return __mei_cl_send(cl, buf, length, MEI_CL_IO_TX_BLOCKING);
223 EXPORT_SYMBOL_GPL(mei_cldev_send);
226 * mei_cldev_recv_nonblock - non block client receive (read)
228 * @cldev: me client device
229 * @buf: buffer to receive
230 * @length: buffer length
232 * Return: read size in bytes of < 0 on error
233 * -EAGAIN if function will block.
235 ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
238 struct mei_cl *cl = cldev->cl;
240 return __mei_cl_recv(cl, buf, length, MEI_CL_IO_RX_NONBLOCK, 0);
242 EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
245 * mei_cldev_recv - client receive (read)
247 * @cldev: me client device
248 * @buf: buffer to receive
249 * @length: buffer length
251 * Return: read size in bytes of < 0 on error
253 ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
255 struct mei_cl *cl = cldev->cl;
257 return __mei_cl_recv(cl, buf, length, 0, 0);
259 EXPORT_SYMBOL_GPL(mei_cldev_recv);
262 * mei_cl_bus_rx_work - dispatch rx event for a bus device
266 static void mei_cl_bus_rx_work(struct work_struct *work)
268 struct mei_cl_device *cldev;
269 struct mei_device *bus;
271 cldev = container_of(work, struct mei_cl_device, rx_work);
278 mutex_lock(&bus->device_lock);
279 mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
280 mutex_unlock(&bus->device_lock);
284 * mei_cl_bus_notif_work - dispatch FW notif event for a bus device
288 static void mei_cl_bus_notif_work(struct work_struct *work)
290 struct mei_cl_device *cldev;
292 cldev = container_of(work, struct mei_cl_device, notif_work);
295 cldev->notif_cb(cldev);
299 * mei_cl_bus_notify_event - schedule notify cb on bus client
303 * Return: true if event was scheduled
304 * false if the client is not waiting for event
306 bool mei_cl_bus_notify_event(struct mei_cl *cl)
308 struct mei_cl_device *cldev = cl->cldev;
310 if (!cldev || !cldev->notif_cb)
316 schedule_work(&cldev->notif_work);
318 cl->notify_ev = false;
324 * mei_cl_bus_rx_event - schedule rx event
328 * Return: true if event was scheduled
329 * false if the client is not waiting for event
331 bool mei_cl_bus_rx_event(struct mei_cl *cl)
333 struct mei_cl_device *cldev = cl->cldev;
335 if (!cldev || !cldev->rx_cb)
338 schedule_work(&cldev->rx_work);
344 * mei_cldev_register_rx_cb - register Rx event callback
346 * @cldev: me client devices
347 * @rx_cb: callback function
349 * Return: 0 on success
350 * -EALREADY if an callback is already registered
353 int mei_cldev_register_rx_cb(struct mei_cl_device *cldev, mei_cldev_cb_t rx_cb)
355 struct mei_device *bus = cldev->bus;
363 cldev->rx_cb = rx_cb;
364 INIT_WORK(&cldev->rx_work, mei_cl_bus_rx_work);
366 mutex_lock(&bus->device_lock);
367 ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
368 mutex_unlock(&bus->device_lock);
369 if (ret && ret != -EBUSY)
374 EXPORT_SYMBOL_GPL(mei_cldev_register_rx_cb);
377 * mei_cldev_register_notif_cb - register FW notification event callback
379 * @cldev: me client devices
380 * @notif_cb: callback function
382 * Return: 0 on success
383 * -EALREADY if an callback is already registered
386 int mei_cldev_register_notif_cb(struct mei_cl_device *cldev,
387 mei_cldev_cb_t notif_cb)
389 struct mei_device *bus = cldev->bus;
398 cldev->notif_cb = notif_cb;
399 INIT_WORK(&cldev->notif_work, mei_cl_bus_notif_work);
401 mutex_lock(&bus->device_lock);
402 ret = mei_cl_notify_request(cldev->cl, NULL, 1);
403 mutex_unlock(&bus->device_lock);
409 EXPORT_SYMBOL_GPL(mei_cldev_register_notif_cb);
412 * mei_cldev_get_drvdata - driver data getter
414 * @cldev: mei client device
416 * Return: driver private data
418 void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev)
420 return dev_get_drvdata(&cldev->dev);
422 EXPORT_SYMBOL_GPL(mei_cldev_get_drvdata);
425 * mei_cldev_set_drvdata - driver data setter
427 * @cldev: mei client device
428 * @data: data to store
430 void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data)
432 dev_set_drvdata(&cldev->dev, data);
434 EXPORT_SYMBOL_GPL(mei_cldev_set_drvdata);
437 * mei_cldev_uuid - return uuid of the underlying me client
439 * @cldev: mei client device
441 * Return: me client uuid
443 const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev)
445 return mei_me_cl_uuid(cldev->me_cl);
447 EXPORT_SYMBOL_GPL(mei_cldev_uuid);
450 * mei_cldev_ver - return protocol version of the underlying me client
452 * @cldev: mei client device
454 * Return: me client protocol version
456 u8 mei_cldev_ver(const struct mei_cl_device *cldev)
458 return mei_me_cl_ver(cldev->me_cl);
460 EXPORT_SYMBOL_GPL(mei_cldev_ver);
463 * mei_cldev_enabled - check whether the device is enabled
465 * @cldev: mei client device
467 * Return: true if me client is initialized and connected
469 bool mei_cldev_enabled(struct mei_cl_device *cldev)
471 return mei_cl_is_connected(cldev->cl);
473 EXPORT_SYMBOL_GPL(mei_cldev_enabled);
476 * mei_cl_bus_module_get - acquire module of the underlying
479 * @cldev: mei client device
481 * Return: true on success; false if the module was removed.
483 static bool mei_cl_bus_module_get(struct mei_cl_device *cldev)
485 return try_module_get(cldev->bus->dev->driver->owner);
489 * mei_cl_bus_module_put - release the underlying hw module.
491 * @cldev: mei client device
493 static void mei_cl_bus_module_put(struct mei_cl_device *cldev)
495 module_put(cldev->bus->dev->driver->owner);
499 * mei_cl_bus_vtag - get bus vtag entry wrapper
500 * The tag for bus client is always first.
504 * Return: bus vtag or NULL
506 static inline struct mei_cl_vtag *mei_cl_bus_vtag(struct mei_cl *cl)
508 return list_first_entry_or_null(&cl->vtag_map,
509 struct mei_cl_vtag, list);
513 * mei_cl_bus_vtag_alloc - add bus client entry to vtag map
515 * @cldev: me client device
519 * * -ENOMEM if memory allocation failed
521 static int mei_cl_bus_vtag_alloc(struct mei_cl_device *cldev)
523 struct mei_cl *cl = cldev->cl;
524 struct mei_cl_vtag *cl_vtag;
527 * Bail out if the client does not supports vtags
528 * or has already allocated one
530 if (mei_cl_vt_support_check(cl) || mei_cl_bus_vtag(cl))
533 cl_vtag = mei_cl_vtag_alloc(NULL, 0);
537 list_add_tail(&cl_vtag->list, &cl->vtag_map);
543 * mei_cl_bus_vtag_free - remove the bus entry from vtag map
545 * @cldev: me client device
547 static void mei_cl_bus_vtag_free(struct mei_cl_device *cldev)
549 struct mei_cl *cl = cldev->cl;
550 struct mei_cl_vtag *cl_vtag;
552 cl_vtag = mei_cl_bus_vtag(cl);
556 list_del(&cl_vtag->list);
561 * mei_cldev_enable - enable me client device
562 * create connection with me client
564 * @cldev: me client device
566 * Return: 0 on success and < 0 on error
568 int mei_cldev_enable(struct mei_cl_device *cldev)
570 struct mei_device *bus = cldev->bus;
576 mutex_lock(&bus->device_lock);
577 if (cl->state == MEI_FILE_UNINITIALIZED) {
578 ret = mei_cl_link(cl);
581 /* update pointers */
585 if (mei_cl_is_connected(cl)) {
590 if (!mei_me_cl_is_active(cldev->me_cl)) {
591 dev_err(&cldev->dev, "me client is not active\n");
596 ret = mei_cl_bus_vtag_alloc(cldev);
600 ret = mei_cl_connect(cl, cldev->me_cl, NULL);
602 dev_err(&cldev->dev, "cannot connect\n");
603 mei_cl_bus_vtag_free(cldev);
607 mutex_unlock(&bus->device_lock);
611 EXPORT_SYMBOL_GPL(mei_cldev_enable);
614 * mei_cldev_unregister_callbacks - internal wrapper for unregistering
617 * @cldev: client device
619 static void mei_cldev_unregister_callbacks(struct mei_cl_device *cldev)
622 cancel_work_sync(&cldev->rx_work);
626 if (cldev->notif_cb) {
627 cancel_work_sync(&cldev->notif_work);
628 cldev->notif_cb = NULL;
633 * mei_cldev_disable - disable me client device
634 * disconnect form the me client
636 * @cldev: me client device
638 * Return: 0 on success and < 0 on error
640 int mei_cldev_disable(struct mei_cl_device *cldev)
642 struct mei_device *bus;
653 mei_cldev_unregister_callbacks(cldev);
655 mutex_lock(&bus->device_lock);
657 mei_cl_bus_vtag_free(cldev);
659 if (!mei_cl_is_connected(cl)) {
660 dev_dbg(bus->dev, "Already disconnected\n");
665 err = mei_cl_disconnect(cl);
667 dev_err(bus->dev, "Could not disconnect from the ME client\n");
670 /* Flush queues and remove any pending read */
671 mei_cl_flush_queues(cl, NULL);
674 mutex_unlock(&bus->device_lock);
677 EXPORT_SYMBOL_GPL(mei_cldev_disable);
680 * mei_cl_device_find - find matching entry in the driver id table
682 * @cldev: me client device
683 * @cldrv: me client driver
685 * Return: id on success; NULL if no id is matching
688 struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev,
689 struct mei_cl_driver *cldrv)
691 const struct mei_cl_device_id *id;
696 uuid = mei_me_cl_uuid(cldev->me_cl);
697 version = mei_me_cl_ver(cldev->me_cl);
699 id = cldrv->id_table;
700 while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) {
701 if (!uuid_le_cmp(*uuid, id->uuid)) {
705 if (strncmp(cldev->name, id->name,
709 if (id->version != MEI_CL_VERSION_ANY)
710 if (id->version != version)
723 * mei_cl_device_match - device match function
728 * Return: 1 if matching device was found 0 otherwise
730 static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
732 struct mei_cl_device *cldev = to_mei_cl_device(dev);
733 struct mei_cl_driver *cldrv = to_mei_cl_driver(drv);
734 const struct mei_cl_device_id *found_id;
739 if (!cldev->do_match)
742 if (!cldrv || !cldrv->id_table)
745 found_id = mei_cl_device_find(cldev, cldrv);
753 * mei_cl_device_probe - bus probe function
757 * Return: 0 on success; < 0 otherwise
759 static int mei_cl_device_probe(struct device *dev)
761 struct mei_cl_device *cldev;
762 struct mei_cl_driver *cldrv;
763 const struct mei_cl_device_id *id;
766 cldev = to_mei_cl_device(dev);
767 cldrv = to_mei_cl_driver(dev->driver);
772 if (!cldrv || !cldrv->probe)
775 id = mei_cl_device_find(cldev, cldrv);
779 if (!mei_cl_bus_module_get(cldev)) {
780 dev_err(&cldev->dev, "get hw module failed");
784 ret = cldrv->probe(cldev, id);
786 mei_cl_bus_module_put(cldev);
790 __module_get(THIS_MODULE);
795 * mei_cl_device_remove - remove device from the bus
799 * Return: 0 on success; < 0 otherwise
801 static int mei_cl_device_remove(struct device *dev)
803 struct mei_cl_device *cldev = to_mei_cl_device(dev);
804 struct mei_cl_driver *cldrv;
807 if (!cldev || !dev->driver)
810 cldrv = to_mei_cl_driver(dev->driver);
812 ret = cldrv->remove(cldev);
814 mei_cldev_unregister_callbacks(cldev);
816 mei_cl_bus_module_put(cldev);
817 module_put(THIS_MODULE);
822 static ssize_t name_show(struct device *dev, struct device_attribute *a,
825 struct mei_cl_device *cldev = to_mei_cl_device(dev);
827 return scnprintf(buf, PAGE_SIZE, "%s", cldev->name);
829 static DEVICE_ATTR_RO(name);
831 static ssize_t uuid_show(struct device *dev, struct device_attribute *a,
834 struct mei_cl_device *cldev = to_mei_cl_device(dev);
835 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
837 return sprintf(buf, "%pUl", uuid);
839 static DEVICE_ATTR_RO(uuid);
841 static ssize_t version_show(struct device *dev, struct device_attribute *a,
844 struct mei_cl_device *cldev = to_mei_cl_device(dev);
845 u8 version = mei_me_cl_ver(cldev->me_cl);
847 return sprintf(buf, "%02X", version);
849 static DEVICE_ATTR_RO(version);
851 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
854 struct mei_cl_device *cldev = to_mei_cl_device(dev);
855 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
856 u8 version = mei_me_cl_ver(cldev->me_cl);
858 return scnprintf(buf, PAGE_SIZE, "mei:%s:%pUl:%02X:",
859 cldev->name, uuid, version);
861 static DEVICE_ATTR_RO(modalias);
863 static ssize_t max_conn_show(struct device *dev, struct device_attribute *a,
866 struct mei_cl_device *cldev = to_mei_cl_device(dev);
867 u8 maxconn = mei_me_cl_max_conn(cldev->me_cl);
869 return sprintf(buf, "%d", maxconn);
871 static DEVICE_ATTR_RO(max_conn);
873 static ssize_t fixed_show(struct device *dev, struct device_attribute *a,
876 struct mei_cl_device *cldev = to_mei_cl_device(dev);
877 u8 fixed = mei_me_cl_fixed(cldev->me_cl);
879 return sprintf(buf, "%d", fixed);
881 static DEVICE_ATTR_RO(fixed);
883 static ssize_t vtag_show(struct device *dev, struct device_attribute *a,
886 struct mei_cl_device *cldev = to_mei_cl_device(dev);
887 bool vt = mei_me_cl_vt(cldev->me_cl);
889 return sprintf(buf, "%d", vt);
891 static DEVICE_ATTR_RO(vtag);
893 static ssize_t max_len_show(struct device *dev, struct device_attribute *a,
896 struct mei_cl_device *cldev = to_mei_cl_device(dev);
897 u32 maxlen = mei_me_cl_max_len(cldev->me_cl);
899 return sprintf(buf, "%u", maxlen);
901 static DEVICE_ATTR_RO(max_len);
903 static struct attribute *mei_cldev_attrs[] = {
906 &dev_attr_version.attr,
907 &dev_attr_modalias.attr,
908 &dev_attr_max_conn.attr,
909 &dev_attr_fixed.attr,
911 &dev_attr_max_len.attr,
914 ATTRIBUTE_GROUPS(mei_cldev);
917 * mei_cl_device_uevent - me client bus uevent handler
920 * @env: uevent kobject
922 * Return: 0 on success -ENOMEM on when add_uevent_var fails
924 static int mei_cl_device_uevent(struct device *dev, struct kobj_uevent_env *env)
926 struct mei_cl_device *cldev = to_mei_cl_device(dev);
927 const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
928 u8 version = mei_me_cl_ver(cldev->me_cl);
930 if (add_uevent_var(env, "MEI_CL_VERSION=%d", version))
933 if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid))
936 if (add_uevent_var(env, "MEI_CL_NAME=%s", cldev->name))
939 if (add_uevent_var(env, "MODALIAS=mei:%s:%pUl:%02X:",
940 cldev->name, uuid, version))
946 static struct bus_type mei_cl_bus_type = {
948 .dev_groups = mei_cldev_groups,
949 .match = mei_cl_device_match,
950 .probe = mei_cl_device_probe,
951 .remove = mei_cl_device_remove,
952 .uevent = mei_cl_device_uevent,
955 static struct mei_device *mei_dev_bus_get(struct mei_device *bus)
958 get_device(bus->dev);
963 static void mei_dev_bus_put(struct mei_device *bus)
966 put_device(bus->dev);
969 static void mei_cl_bus_dev_release(struct device *dev)
971 struct mei_cl_device *cldev = to_mei_cl_device(dev);
976 mei_me_cl_put(cldev->me_cl);
977 mei_dev_bus_put(cldev->bus);
978 mei_cl_unlink(cldev->cl);
983 static const struct device_type mei_cl_device_type = {
984 .release = mei_cl_bus_dev_release,
988 * mei_cl_bus_set_name - set device name for me client device
989 * <controller>-<client device>
990 * Example: 0000:00:16.0-55213584-9a29-4916-badf-0fb7ed682aeb
992 * @cldev: me client device
994 static inline void mei_cl_bus_set_name(struct mei_cl_device *cldev)
996 dev_set_name(&cldev->dev, "%s-%pUl",
997 dev_name(cldev->bus->dev),
998 mei_me_cl_uuid(cldev->me_cl));
1002 * mei_cl_bus_dev_alloc - initialize and allocate mei client device
1007 * Return: allocated device structur or NULL on allocation failure
1009 static struct mei_cl_device *mei_cl_bus_dev_alloc(struct mei_device *bus,
1010 struct mei_me_client *me_cl)
1012 struct mei_cl_device *cldev;
1015 cldev = kzalloc(sizeof(*cldev), GFP_KERNEL);
1019 cl = mei_cl_allocate(bus);
1025 device_initialize(&cldev->dev);
1026 cldev->dev.parent = bus->dev;
1027 cldev->dev.bus = &mei_cl_bus_type;
1028 cldev->dev.type = &mei_cl_device_type;
1029 cldev->bus = mei_dev_bus_get(bus);
1030 cldev->me_cl = mei_me_cl_get(me_cl);
1032 mei_cl_bus_set_name(cldev);
1033 cldev->is_added = 0;
1034 INIT_LIST_HEAD(&cldev->bus_list);
1040 * mei_cl_dev_setup - setup me client device
1041 * run fix up routines and set the device name
1044 * @cldev: me client device
1046 * Return: true if the device is eligible for enumeration
1048 static bool mei_cl_bus_dev_setup(struct mei_device *bus,
1049 struct mei_cl_device *cldev)
1051 cldev->do_match = 1;
1052 mei_cl_bus_dev_fixup(cldev);
1054 /* the device name can change during fix up */
1055 if (cldev->do_match)
1056 mei_cl_bus_set_name(cldev);
1058 return cldev->do_match == 1;
1062 * mei_cl_bus_dev_add - add me client devices
1064 * @cldev: me client device
1066 * Return: 0 on success; < 0 on failre
1068 static int mei_cl_bus_dev_add(struct mei_cl_device *cldev)
1072 dev_dbg(cldev->bus->dev, "adding %pUL:%02X\n",
1073 mei_me_cl_uuid(cldev->me_cl),
1074 mei_me_cl_ver(cldev->me_cl));
1075 ret = device_add(&cldev->dev);
1077 cldev->is_added = 1;
1083 * mei_cl_bus_dev_stop - stop the driver
1085 * @cldev: me client device
1087 static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev)
1089 if (cldev->is_added)
1090 device_release_driver(&cldev->dev);
1094 * mei_cl_bus_dev_destroy - destroy me client devices object
1096 * @cldev: me client device
1098 * Locking: called under "dev->cl_bus_lock" lock
1100 static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev)
1103 WARN_ON(!mutex_is_locked(&cldev->bus->cl_bus_lock));
1105 if (!cldev->is_added)
1108 device_del(&cldev->dev);
1110 list_del_init(&cldev->bus_list);
1112 cldev->is_added = 0;
1113 put_device(&cldev->dev);
1117 * mei_cl_bus_remove_device - remove a devices form the bus
1119 * @cldev: me client device
1121 static void mei_cl_bus_remove_device(struct mei_cl_device *cldev)
1123 mei_cl_bus_dev_stop(cldev);
1124 mei_cl_bus_dev_destroy(cldev);
1128 * mei_cl_bus_remove_devices - remove all devices form the bus
1132 void mei_cl_bus_remove_devices(struct mei_device *bus)
1134 struct mei_cl_device *cldev, *next;
1136 mutex_lock(&bus->cl_bus_lock);
1137 list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list)
1138 mei_cl_bus_remove_device(cldev);
1139 mutex_unlock(&bus->cl_bus_lock);
1144 * mei_cl_bus_dev_init - allocate and initializes an mei client devices
1145 * based on me client
1150 * Locking: called under "dev->cl_bus_lock" lock
1152 static void mei_cl_bus_dev_init(struct mei_device *bus,
1153 struct mei_me_client *me_cl)
1155 struct mei_cl_device *cldev;
1157 WARN_ON(!mutex_is_locked(&bus->cl_bus_lock));
1159 dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl));
1161 if (me_cl->bus_added)
1164 cldev = mei_cl_bus_dev_alloc(bus, me_cl);
1168 me_cl->bus_added = true;
1169 list_add_tail(&cldev->bus_list, &bus->device_list);
1174 * mei_cl_bus_rescan - scan me clients list and add create
1175 * devices for eligible clients
1179 static void mei_cl_bus_rescan(struct mei_device *bus)
1181 struct mei_cl_device *cldev, *n;
1182 struct mei_me_client *me_cl;
1184 mutex_lock(&bus->cl_bus_lock);
1186 down_read(&bus->me_clients_rwsem);
1187 list_for_each_entry(me_cl, &bus->me_clients, list)
1188 mei_cl_bus_dev_init(bus, me_cl);
1189 up_read(&bus->me_clients_rwsem);
1191 list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) {
1193 if (!mei_me_cl_is_active(cldev->me_cl)) {
1194 mei_cl_bus_remove_device(cldev);
1198 if (cldev->is_added)
1201 if (mei_cl_bus_dev_setup(bus, cldev))
1202 mei_cl_bus_dev_add(cldev);
1204 list_del_init(&cldev->bus_list);
1205 put_device(&cldev->dev);
1208 mutex_unlock(&bus->cl_bus_lock);
1210 dev_dbg(bus->dev, "rescan end");
1213 void mei_cl_bus_rescan_work(struct work_struct *work)
1215 struct mei_device *bus =
1216 container_of(work, struct mei_device, bus_rescan_work);
1218 mei_cl_bus_rescan(bus);
1221 int __mei_cldev_driver_register(struct mei_cl_driver *cldrv,
1222 struct module *owner)
1226 cldrv->driver.name = cldrv->name;
1227 cldrv->driver.owner = owner;
1228 cldrv->driver.bus = &mei_cl_bus_type;
1230 err = driver_register(&cldrv->driver);
1234 pr_debug("mei: driver [%s] registered\n", cldrv->driver.name);
1238 EXPORT_SYMBOL_GPL(__mei_cldev_driver_register);
1240 void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv)
1242 driver_unregister(&cldrv->driver);
1244 pr_debug("mei: driver [%s] unregistered\n", cldrv->driver.name);
1246 EXPORT_SYMBOL_GPL(mei_cldev_driver_unregister);
1249 int __init mei_cl_bus_init(void)
1251 return bus_register(&mei_cl_bus_type);
1254 void __exit mei_cl_bus_exit(void)
1256 bus_unregister(&mei_cl_bus_type);