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uwb: add the UWB stack (radio controller interface)

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Add the UWB radio controller interface (URCI) support.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
This commit is contained in:
Inaky Perez-Gonzalez 2008-09-17 16:34:07 +01:00 committed by David Vrabel
parent 183b9b592a
commit 0612edfd95
3 changed files with 1463 additions and 0 deletions
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485
drivers/uwb/est.c Normal file
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@ -0,0 +1,485 @@
/*
* Ultra Wide Band Radio Control
* Event Size Tables management
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: docs
*
* Infrastructure, code and data tables for guessing the size of
* events received on the notification endpoints of UWB radio
* controllers.
*
* You define a table of events and for each, its size and how to get
* the extra size.
*
* ENTRY POINTS:
*
* uwb_est_{init/destroy}(): To initialize/release the EST subsystem.
*
* uwb_est_[u]register(): To un/register event size tables
* uwb_est_grow()
*
* uwb_est_find_size(): Get the size of an event
* uwb_est_get_size()
*/
#include <linux/spinlock.h>
#define D_LOCAL 0
#include <linux/uwb/debug.h>
#include "uwb-internal.h"
struct uwb_est {
u16 type_event_high;
u16 vendor, product;
u8 entries;
const struct uwb_est_entry *entry;
};
static struct uwb_est *uwb_est;
static u8 uwb_est_size;
static u8 uwb_est_used;
static DEFINE_RWLOCK(uwb_est_lock);
/**
* WUSB Standard Event Size Table, HWA-RC interface
*
* Sizes for events and notifications type 0 (general), high nibble 0.
*/
static
struct uwb_est_entry uwb_est_00_00xx[] = {
[UWB_RC_EVT_IE_RCV] = {
.size = sizeof(struct uwb_rc_evt_ie_rcv),
.offset = 1 + offsetof(struct uwb_rc_evt_ie_rcv, wIELength),
},
[UWB_RC_EVT_BEACON] = {
.size = sizeof(struct uwb_rc_evt_beacon),
.offset = 1 + offsetof(struct uwb_rc_evt_beacon, wBeaconInfoLength),
},
[UWB_RC_EVT_BEACON_SIZE] = {
.size = sizeof(struct uwb_rc_evt_beacon_size),
},
[UWB_RC_EVT_BPOIE_CHANGE] = {
.size = sizeof(struct uwb_rc_evt_bpoie_change),
.offset = 1 + offsetof(struct uwb_rc_evt_bpoie_change,
wBPOIELength),
},
[UWB_RC_EVT_BP_SLOT_CHANGE] = {
.size = sizeof(struct uwb_rc_evt_bp_slot_change),
},
[UWB_RC_EVT_BP_SWITCH_IE_RCV] = {
.size = sizeof(struct uwb_rc_evt_bp_switch_ie_rcv),
.offset = 1 + offsetof(struct uwb_rc_evt_bp_switch_ie_rcv, wIELength),
},
[UWB_RC_EVT_DEV_ADDR_CONFLICT] = {
.size = sizeof(struct uwb_rc_evt_dev_addr_conflict),
},
[UWB_RC_EVT_DRP_AVAIL] = {
.size = sizeof(struct uwb_rc_evt_drp_avail)
},
[UWB_RC_EVT_DRP] = {
.size = sizeof(struct uwb_rc_evt_drp),
.offset = 1 + offsetof(struct uwb_rc_evt_drp, ie_length),
},
[UWB_RC_EVT_BP_SWITCH_STATUS] = {
.size = sizeof(struct uwb_rc_evt_bp_switch_status),
},
[UWB_RC_EVT_CMD_FRAME_RCV] = {
.size = sizeof(struct uwb_rc_evt_cmd_frame_rcv),
.offset = 1 + offsetof(struct uwb_rc_evt_cmd_frame_rcv, dataLength),
},
[UWB_RC_EVT_CHANNEL_CHANGE_IE_RCV] = {
.size = sizeof(struct uwb_rc_evt_channel_change_ie_rcv),
.offset = 1 + offsetof(struct uwb_rc_evt_channel_change_ie_rcv, wIELength),
},
[UWB_RC_CMD_CHANNEL_CHANGE] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_DEV_ADDR_MGMT] = {
.size = sizeof(struct uwb_rc_evt_dev_addr_mgmt) },
[UWB_RC_CMD_GET_IE] = {
.size = sizeof(struct uwb_rc_evt_get_ie),
.offset = 1 + offsetof(struct uwb_rc_evt_get_ie, wIELength),
},
[UWB_RC_CMD_RESET] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_SCAN] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_SET_BEACON_FILTER] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_SET_DRP_IE] = {
.size = sizeof(struct uwb_rc_evt_set_drp_ie),
},
[UWB_RC_CMD_SET_IE] = {
.size = sizeof(struct uwb_rc_evt_set_ie),
},
[UWB_RC_CMD_SET_NOTIFICATION_FILTER] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_SET_TX_POWER] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_SLEEP] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_START_BEACON] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_STOP_BEACON] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_BP_MERGE] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_SEND_COMMAND_FRAME] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
[UWB_RC_CMD_SET_ASIE_NOTIF] = {
.size = sizeof(struct uwb_rc_evt_confirm),
},
};
static
struct uwb_est_entry uwb_est_01_00xx[] = {
[UWB_RC_DAA_ENERGY_DETECTED] = {
.size = sizeof(struct uwb_rc_evt_daa_energy_detected),
},
[UWB_RC_SET_DAA_ENERGY_MASK] = {
.size = sizeof(struct uwb_rc_evt_set_daa_energy_mask),
},
[UWB_RC_SET_NOTIFICATION_FILTER_EX] = {
.size = sizeof(struct uwb_rc_evt_set_notification_filter_ex),
},
};
/**
* Initialize the EST subsystem
*
* Register the standard tables also.
*
* FIXME: tag init
*/
int uwb_est_create(void)
{
int result;
uwb_est_size = 2;
uwb_est_used = 0;
uwb_est = kzalloc(uwb_est_size * sizeof(uwb_est[0]), GFP_KERNEL);
if (uwb_est == NULL)
return -ENOMEM;
result = uwb_est_register(UWB_RC_CET_GENERAL, 0, 0xffff, 0xffff,
uwb_est_00_00xx, ARRAY_SIZE(uwb_est_00_00xx));
if (result < 0)
goto out;
result = uwb_est_register(UWB_RC_CET_EX_TYPE_1, 0, 0xffff, 0xffff,
uwb_est_01_00xx, ARRAY_SIZE(uwb_est_01_00xx));
out:
return result;
}
/** Clean it up */
void uwb_est_destroy(void)
{
kfree(uwb_est);
uwb_est = NULL;
uwb_est_size = uwb_est_used = 0;
}
/**
* Double the capacity of the EST table
*
* @returns 0 if ok, < 0 errno no error.
*/
static
int uwb_est_grow(void)
{
size_t actual_size = uwb_est_size * sizeof(uwb_est[0]);
void *new = kmalloc(2 * actual_size, GFP_ATOMIC);
if (new == NULL)
return -ENOMEM;
memcpy(new, uwb_est, actual_size);
memset(new + actual_size, 0, actual_size);
kfree(uwb_est);
uwb_est = new;
uwb_est_size *= 2;
return 0;
}
/**
* Register an event size table
*
* Makes room for it if the table is full, and then inserts it in the
* right position (entries are sorted by type, event_high, vendor and
* then product).
*
* @vendor: vendor code for matching against the device (0x0000 and
* 0xffff mean any); use 0x0000 to force all to match without
* checking possible vendor specific ones, 0xfffff to match
* after checking vendor specific ones.
*
* @product: product code from that vendor; same matching rules, use
* 0x0000 for not allowing vendor specific matches, 0xffff
* for allowing.
*
* This arragement just makes the tables sort differenty. Because the
* table is sorted by growing type-event_high-vendor-product, a zero
* vendor will match before than a 0x456a vendor, that will match
* before a 0xfffff vendor.
*
* @returns 0 if ok, < 0 errno on error (-ENOENT if not found).
*/
/* FIXME: add bus type to vendor/product code */
int uwb_est_register(u8 type, u8 event_high, u16 vendor, u16 product,
const struct uwb_est_entry *entry, size_t entries)
{
unsigned long flags;
unsigned itr;
u16 type_event_high;
int result = 0;
write_lock_irqsave(&uwb_est_lock, flags);
if (uwb_est_used == uwb_est_size) {
result = uwb_est_grow();
if (result < 0)
goto out;
}
/* Find the right spot to insert it in */
type_event_high = type << 8 | event_high;
for (itr = 0; itr < uwb_est_used; itr++)
if (uwb_est[itr].type_event_high < type
&& uwb_est[itr].vendor < vendor
&& uwb_est[itr].product < product)
break;
/* Shift others to make room for the new one? */
if (itr < uwb_est_used)
memmove(&uwb_est[itr+1], &uwb_est[itr], uwb_est_used - itr);
uwb_est[itr].type_event_high = type << 8 | event_high;
uwb_est[itr].vendor = vendor;
uwb_est[itr].product = product;
uwb_est[itr].entry = entry;
uwb_est[itr].entries = entries;
uwb_est_used++;
out:
write_unlock_irqrestore(&uwb_est_lock, flags);
return result;
}
EXPORT_SYMBOL_GPL(uwb_est_register);
/**
* Unregister an event size table
*
* This just removes the specified entry and moves the ones after it
* to fill in the gap. This is needed to keep the list sorted; no
* reallocation is done to reduce the size of the table.
*
* We unregister by all the data we used to register instead of by
* pointer to the @entry array because we might have used the same
* table for a bunch of IDs (for example).
*
* @returns 0 if ok, < 0 errno on error (-ENOENT if not found).
*/
int uwb_est_unregister(u8 type, u8 event_high, u16 vendor, u16 product,
const struct uwb_est_entry *entry, size_t entries)
{
unsigned long flags;
unsigned itr;
struct uwb_est est_cmp = {
.type_event_high = type << 8 | event_high,
.vendor = vendor,
.product = product,
.entry = entry,
.entries = entries
};
write_lock_irqsave(&uwb_est_lock, flags);
for (itr = 0; itr < uwb_est_used; itr++)
if (!memcmp(&uwb_est[itr], &est_cmp, sizeof(est_cmp)))
goto found;
write_unlock_irqrestore(&uwb_est_lock, flags);
return -ENOENT;
found:
if (itr < uwb_est_used - 1) /* Not last one? move ones above */
memmove(&uwb_est[itr], &uwb_est[itr+1], uwb_est_used - itr - 1);
uwb_est_used--;
write_unlock_irqrestore(&uwb_est_lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(uwb_est_unregister);
/**
* Get the size of an event from a table
*
* @rceb: pointer to the buffer with the event
* @rceb_size: size of the area pointed to by @rceb in bytes.
* @returns: > 0 Size of the event
* -ENOSPC An area big enough was not provided to look
* ahead into the event's guts and guess the size.
* -EINVAL Unknown event code (wEvent).
*
* This will look at the received RCEB and guess what is the total
* size. For variable sized events, it will look further ahead into
* their length field to see how much data should be read.
*
* Note this size is *not* final--the neh (Notification/Event Handle)
* might specificy an extra size to add.
*/
static
ssize_t uwb_est_get_size(struct uwb_rc *uwb_rc, struct uwb_est *est,
u8 event_low, const struct uwb_rceb *rceb,
size_t rceb_size)
{
unsigned offset;
ssize_t size;
struct device *dev = &uwb_rc->uwb_dev.dev;
const struct uwb_est_entry *entry;
size = -ENOENT;
if (event_low >= est->entries) { /* in range? */
if (printk_ratelimit())
dev_err(dev, "EST %p 0x%04x/%04x/%04x[%u]: "
"event %u out of range\n",
est, est->type_event_high, est->vendor,
est->product, est->entries,
event_low);
goto out;
}
size = -ENOENT;
entry = &est->entry[event_low];
if (entry->size == 0 && entry->offset == 0) { /* unknown? */
if (printk_ratelimit())
dev_err(dev, "EST %p 0x%04x/%04x/%04x[%u]: "
"event %u unknown\n",
est, est->type_event_high, est->vendor,
est->product, est->entries, event_low);
goto out;
}
offset = entry->offset; /* extra fries with that? */
if (offset == 0)
size = entry->size;
else {
/* Ops, got an extra size field at 'offset'--read it */
const void *ptr = rceb;
size_t type_size = 0;
offset--;
size = -ENOSPC; /* enough data for more? */
switch (entry->type) {
case UWB_EST_16: type_size = sizeof(__le16); break;
case UWB_EST_8: type_size = sizeof(u8); break;
default: BUG();
}
if (offset + type_size >= rceb_size) {
if (printk_ratelimit())
dev_err(dev, "EST %p 0x%04x/%04x/%04x[%u]: "
"not enough data to read extra size\n",
est, est->type_event_high, est->vendor,
est->product, est->entries);
goto out;
}
size = entry->size;
ptr += offset;
switch (entry->type) {
case UWB_EST_16: size += le16_to_cpu(*(__le16 *)ptr); break;
case UWB_EST_8: size += *(u8 *)ptr; break;
default: BUG();
}
}
out:
return size;
}
/**
* Guesses the size of a WA event
*
* @rceb: pointer to the buffer with the event
* @rceb_size: size of the area pointed to by @rceb in bytes.
* @returns: > 0 Size of the event
* -ENOSPC An area big enough was not provided to look
* ahead into the event's guts and guess the size.
* -EINVAL Unknown event code (wEvent).
*
* This will look at the received RCEB and guess what is the total
* size by checking all the tables registered with
* uwb_est_register(). For variable sized events, it will look further
* ahead into their length field to see how much data should be read.
*
* Note this size is *not* final--the neh (Notification/Event Handle)
* might specificy an extra size to add or replace.
*/
ssize_t uwb_est_find_size(struct uwb_rc *rc, const struct uwb_rceb *rceb,
size_t rceb_size)
{
/* FIXME: add vendor/product data */
ssize_t size;
struct device *dev = &rc->uwb_dev.dev;
unsigned long flags;
unsigned itr;
u16 type_event_high, event;
u8 *ptr = (u8 *) rceb;
read_lock_irqsave(&uwb_est_lock, flags);
d_printf(2, dev, "Size query for event 0x%02x/%04x/%02x,"
" buffer size %ld\n",
(unsigned) rceb->bEventType,
(unsigned) le16_to_cpu(rceb->wEvent),
(unsigned) rceb->bEventContext,
(long) rceb_size);
size = -ENOSPC;
if (rceb_size < sizeof(*rceb))
goto out;
event = le16_to_cpu(rceb->wEvent);
type_event_high = rceb->bEventType << 8 | (event & 0xff00) >> 8;
for (itr = 0; itr < uwb_est_used; itr++) {
d_printf(3, dev, "Checking EST 0x%04x/%04x/%04x\n",
uwb_est[itr].type_event_high, uwb_est[itr].vendor,
uwb_est[itr].product);
if (uwb_est[itr].type_event_high != type_event_high)
continue;
size = uwb_est_get_size(rc, &uwb_est[itr],
event & 0x00ff, rceb, rceb_size);
/* try more tables that might handle the same type */
if (size != -ENOENT)
goto out;
}
/* FIXME: downgrade to _dbg() */
if (printk_ratelimit())
dev_err(dev, "event 0x%02x/%04x/%02x: no handlers available; "
"RCEB %02x %02x %02x %02x\n",
(unsigned) rceb->bEventType,
(unsigned) le16_to_cpu(rceb->wEvent),
(unsigned) rceb->bEventContext,
ptr[0], ptr[1], ptr[2], ptr[3]);
size = -ENOENT;
out:
read_unlock_irqrestore(&uwb_est_lock, flags);
return size;
}
EXPORT_SYMBOL_GPL(uwb_est_find_size);

616
drivers/uwb/neh.c Normal file
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@ -0,0 +1,616 @@
/*
* WUSB Wire Adapter: Radio Control Interface (WUSB[8])
* Notification and Event Handling
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* The RC interface of the Host Wire Adapter (USB dongle) or WHCI PCI
* card delivers a stream of notifications and events to the
* notification end event endpoint or area. This code takes care of
* getting a buffer with that data, breaking it up in separate
* notifications and events and then deliver those.
*
* Events are answers to commands and they carry a context ID that
* associates them to the command. Notifications are that,
* notifications, they come out of the blue and have a context ID of
* zero. Think of the context ID kind of like a handler. The
* uwb_rc_neh_* code deals with managing context IDs.
*
* This is why you require a handle to operate on a UWB host. When you
* open a handle a context ID is assigned to you.
*
* So, as it is done is:
*
* 1. Add an event handler [uwb_rc_neh_add()] (assigns a ctx id)
* 2. Issue command [rc->cmd(rc, ...)]
* 3. Arm the timeout timer [uwb_rc_neh_arm()]
* 4, Release the reference to the neh [uwb_rc_neh_put()]
* 5. Wait for the callback
* 6. Command result (RCEB) is passed to the callback
*
* If (2) fails, you should remove the handle [uwb_rc_neh_rm()]
* instead of arming the timer.
*
* Handles are for using in *serialized* code, single thread.
*
* When the notification/event comes, the IRQ handler/endpoint
* callback passes the data read to uwb_rc_neh_grok() which will break
* it up in a discrete series of events, look up who is listening for
* them and execute the pertinent callbacks.
*
* If the reader detects an error while reading the data stream, call
* uwb_rc_neh_error().
*
* CONSTRAINTS/ASSUMPTIONS:
*
* - Most notifications/events are small (less thank .5k), copying
* around is ok.
*
* - Notifications/events are ALWAYS smaller than PAGE_SIZE
*
* - Notifications/events always come in a single piece (ie: a buffer
* will always contain entire notifications/events).
*
* - we cannot know in advance how long each event is (because they
* lack a length field in their header--smart move by the standards
* body, btw). So we need a facility to get the event size given the
* header. This is what the EST code does (notif/Event Size
* Tables), check nest.c--as well, you can associate the size to
* the handle [w/ neh->extra_size()].
*
* - Most notifications/events are fixed size; only a few are variable
* size (NEST takes care of that).
*
* - Listeners of events expect them, so they usually provide a
* buffer, as they know the size. Listeners to notifications don't,
* so we allocate their buffers dynamically.
*/
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/err.h>
#include "uwb-internal.h"
#define D_LOCAL 0
#include <linux/uwb/debug.h>
/*
* UWB Radio Controller Notification/Event Handle
*
* Represents an entity waiting for an event coming from the UWB Radio
* Controller with a given context id (context) and type (evt_type and
* evt). On reception of the notification/event, the callback (cb) is
* called with the event.
*
* If the timer expires before the event is received, the callback is
* called with -ETIMEDOUT as the event size.
*/
struct uwb_rc_neh {
struct kref kref;
struct uwb_rc *rc;
u8 evt_type;
__le16 evt;
u8 context;
uwb_rc_cmd_cb_f cb;
void *arg;
struct timer_list timer;
struct list_head list_node;
};
static void uwb_rc_neh_timer(unsigned long arg);
static void uwb_rc_neh_release(struct kref *kref)
{
struct uwb_rc_neh *neh = container_of(kref, struct uwb_rc_neh, kref);
kfree(neh);
}
static void uwb_rc_neh_get(struct uwb_rc_neh *neh)
{
kref_get(&neh->kref);
}
/**
* uwb_rc_neh_put - release reference to a neh
* @neh: the neh
*/
void uwb_rc_neh_put(struct uwb_rc_neh *neh)
{
kref_put(&neh->kref, uwb_rc_neh_release);
}
/**
* Assigns @neh a context id from @rc's pool
*
* @rc: UWB Radio Controller descriptor; @rc->neh_lock taken
* @neh: Notification/Event Handle
* @returns 0 if context id was assigned ok; < 0 errno on error (if
* all the context IDs are taken).
*
* (assumes @wa is locked).
*
* NOTE: WUSB spec reserves context ids 0x00 for notifications and
* 0xff is invalid, so they must not be used. Initialization
* fills up those two in the bitmap so they are not allocated.
*
* We spread the allocation around to reduce the posiblity of two
* consecutive opened @neh's getting the same context ID assigned (to
* avoid surprises with late events that timed out long time ago). So
* first we search from where @rc->ctx_roll is, if not found, we
* search from zero.
*/
static
int __uwb_rc_ctx_get(struct uwb_rc *rc, struct uwb_rc_neh *neh)
{
int result;
result = find_next_zero_bit(rc->ctx_bm, UWB_RC_CTX_MAX,
rc->ctx_roll++);
if (result < UWB_RC_CTX_MAX)
goto found;
result = find_first_zero_bit(rc->ctx_bm, UWB_RC_CTX_MAX);
if (result < UWB_RC_CTX_MAX)
goto found;
return -ENFILE;
found:
set_bit(result, rc->ctx_bm);
neh->context = result;
return 0;
}
/** Releases @neh's context ID back to @rc (@rc->neh_lock is locked). */
static
void __uwb_rc_ctx_put(struct uwb_rc *rc, struct uwb_rc_neh *neh)
{
struct device *dev = &rc->uwb_dev.dev;
if (neh->context == 0)
return;
if (test_bit(neh->context, rc->ctx_bm) == 0) {
dev_err(dev, "context %u not set in bitmap\n",
neh->context);
WARN_ON(1);
}
clear_bit(neh->context, rc->ctx_bm);
neh->context = 0;
}
/**
* uwb_rc_neh_add - add a neh for a radio controller command
* @rc: the radio controller
* @cmd: the radio controller command
* @expected_type: the type of the expected response event
* @expected_event: the expected event ID
* @cb: callback for when the event is received
* @arg: argument for the callback
*
* Creates a neh and adds it to the list of those waiting for an
* event. A context ID will be assigned to the command.
*/
struct uwb_rc_neh *uwb_rc_neh_add(struct uwb_rc *rc, struct uwb_rccb *cmd,
u8 expected_type, u16 expected_event,
uwb_rc_cmd_cb_f cb, void *arg)
{
int result;
unsigned long flags;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rc_neh *neh;
neh = kzalloc(sizeof(*neh), GFP_KERNEL);
if (neh == NULL) {
result = -ENOMEM;
goto error_kzalloc;
}
kref_init(&neh->kref);
INIT_LIST_HEAD(&neh->list_node);
init_timer(&neh->timer);
neh->timer.function = uwb_rc_neh_timer;
neh->timer.data = (unsigned long)neh;
neh->rc = rc;
neh->evt_type = expected_type;
neh->evt = cpu_to_le16(expected_event);
neh->cb = cb;
neh->arg = arg;
spin_lock_irqsave(&rc->neh_lock, flags);
result = __uwb_rc_ctx_get(rc, neh);
if (result >= 0) {
cmd->bCommandContext = neh->context;
list_add_tail(&neh->list_node, &rc->neh_list);
uwb_rc_neh_get(neh);
}
spin_unlock_irqrestore(&rc->neh_lock, flags);
if (result < 0)
goto error_ctx_get;
return neh;
error_ctx_get:
kfree(neh);
error_kzalloc:
dev_err(dev, "cannot open handle to radio controller: %d\n", result);
return ERR_PTR(result);
}
static void __uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
{
del_timer(&neh->timer);
__uwb_rc_ctx_put(rc, neh);
list_del(&neh->list_node);
}
/**
* uwb_rc_neh_rm - remove a neh.
* @rc: the radio controller
* @neh: the neh to remove
*
* Remove an active neh immediately instead of waiting for the event
* (or a time out).
*/
void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
{
unsigned long flags;
spin_lock_irqsave(&rc->neh_lock, flags);
__uwb_rc_neh_rm(rc, neh);
spin_unlock_irqrestore(&rc->neh_lock, flags);
uwb_rc_neh_put(neh);
}
/**
* uwb_rc_neh_arm - arm an event handler timeout timer
*
* @rc: UWB Radio Controller
* @neh: Notification/event handler for @rc
*
* The timer is only armed if the neh is active.
*/
void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
{
unsigned long flags;
spin_lock_irqsave(&rc->neh_lock, flags);
if (neh->context)
mod_timer(&neh->timer,
jiffies + msecs_to_jiffies(UWB_RC_CMD_TIMEOUT_MS));
spin_unlock_irqrestore(&rc->neh_lock, flags);
}
static void uwb_rc_neh_cb(struct uwb_rc_neh *neh, struct uwb_rceb *rceb, size_t size)
{
(*neh->cb)(neh->rc, neh->arg, rceb, size);
uwb_rc_neh_put(neh);
}
static bool uwb_rc_neh_match(struct uwb_rc_neh *neh, const struct uwb_rceb *rceb)
{
return neh->evt_type == rceb->bEventType
&& neh->evt == rceb->wEvent
&& neh->context == rceb->bEventContext;
}
/**
* Find the handle waiting for a RC Radio Control Event
*
* @rc: UWB Radio Controller
* @rceb: Pointer to the RCEB buffer
* @event_size: Pointer to the size of the RCEB buffer. Might be
* adjusted to take into account the @neh->extra_size
* settings.
*
* If the listener has no buffer (NULL buffer), one is allocated for
* the right size (the amount of data received). @neh->ptr will point
* to the event payload, which always starts with a 'struct
* uwb_rceb'. kfree() it when done.
*/
static
struct uwb_rc_neh *uwb_rc_neh_lookup(struct uwb_rc *rc,
const struct uwb_rceb *rceb)
{
struct uwb_rc_neh *neh = NULL, *h;
unsigned long flags;
spin_lock_irqsave(&rc->neh_lock, flags);
list_for_each_entry(h, &rc->neh_list, list_node) {
if (uwb_rc_neh_match(h, rceb)) {
neh = h;
break;
}
}
if (neh)
__uwb_rc_neh_rm(rc, neh);
spin_unlock_irqrestore(&rc->neh_lock, flags);
return neh;
}
/**
* Process notifications coming from the radio control interface
*
* @rc: UWB Radio Control Interface descriptor
* @neh: Notification/Event Handler @neh->ptr points to
* @uwb_evt->buffer.
*
* This function is called by the event/notif handling subsystem when
* notifications arrive (hwarc_probe() arms a notification/event handle
* that calls back this function for every received notification; this
* function then will rearm itself).
*
* Notification data buffers are dynamically allocated by the NEH
* handling code in neh.c [uwb_rc_neh_lookup()]. What is actually
* allocated is space to contain the notification data.
*
* Buffers are prefixed with a Radio Control Event Block (RCEB) as
* defined by the WUSB Wired-Adapter Radio Control interface. We
* just use it for the notification code.
*
* On each case statement we just transcode endianess of the different
* fields. We declare a pointer to a RCI definition of an event, and
* then to a UWB definition of the same event (which are the same,
* remember). Event if we use different pointers
*/
static
void uwb_rc_notif(struct uwb_rc *rc, struct uwb_rceb *rceb, ssize_t size)
{
struct device *dev = &rc->uwb_dev.dev;
struct uwb_event *uwb_evt;
if (size == -ESHUTDOWN)
return;
if (size < 0) {
dev_err(dev, "ignoring event with error code %zu\n",
size);
return;
}
uwb_evt = kzalloc(sizeof(*uwb_evt), GFP_ATOMIC);
if (unlikely(uwb_evt == NULL)) {
dev_err(dev, "no memory to queue event 0x%02x/%04x/%02x\n",
rceb->bEventType, le16_to_cpu(rceb->wEvent),
rceb->bEventContext);
return;
}
uwb_evt->rc = __uwb_rc_get(rc); /* will be put by uwbd's uwbd_event_handle() */
uwb_evt->ts_jiffies = jiffies;
uwb_evt->type = UWB_EVT_TYPE_NOTIF;
uwb_evt->notif.size = size;
uwb_evt->notif.rceb = rceb;
switch (le16_to_cpu(rceb->wEvent)) {
/* Trap some vendor specific events
*
* FIXME: move this to handling in ptc-est, where we
* register a NULL event handler for these two guys
* using the Intel IDs.
*/
case 0x0103:
dev_info(dev, "FIXME: DEVICE ADD\n");
return;
case 0x0104:
dev_info(dev, "FIXME: DEVICE RM\n");
return;
default:
break;
}
uwbd_event_queue(uwb_evt);
}
static void uwb_rc_neh_grok_event(struct uwb_rc *rc, struct uwb_rceb *rceb, size_t size)
{
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rc_neh *neh;
struct uwb_rceb *notif;
if (rceb->bEventContext == 0) {
notif = kmalloc(size, GFP_ATOMIC);
if (notif) {
memcpy(notif, rceb, size);
uwb_rc_notif(rc, notif, size);
} else
dev_err(dev, "event 0x%02x/%04x/%02x (%zu bytes): no memory\n",
rceb->bEventType, le16_to_cpu(rceb->wEvent),
rceb->bEventContext, size);
} else {
neh = uwb_rc_neh_lookup(rc, rceb);
if (neh)
uwb_rc_neh_cb(neh, rceb, size);
else if (printk_ratelimit())
dev_warn(dev, "event 0x%02x/%04x/%02x (%zu bytes): nobody cared\n",
rceb->bEventType, le16_to_cpu(rceb->wEvent),
rceb->bEventContext, size);
}
}
/**
* Given a buffer with one or more UWB RC events/notifications, break
* them up and dispatch them.
*
* @rc: UWB Radio Controller
* @buf: Buffer with the stream of notifications/events
* @buf_size: Amount of data in the buffer
*
* Note each notification/event starts always with a 'struct
* uwb_rceb', so the minimum size if 4 bytes.
*
* The device may pass us events formatted differently than expected.
* These are first filtered, potentially creating a new event in a new
* memory location. If a new event is created by the filter it is also
* freed here.
*
* For each notif/event, tries to guess the size looking at the EST
* tables, then looks for a neh that is waiting for that event and if
* found, copies the payload to the neh's buffer and calls it back. If
* not, the data is ignored.
*
* Note that if we can't find a size description in the EST tables, we
* still might find a size in the 'neh' handle in uwb_rc_neh_lookup().
*
* Assumptions:
*
* @rc->neh_lock is NOT taken
*
* We keep track of various sizes here:
* size: contains the size of the buffer that is processed for the
* incoming event. this buffer may contain events that are not
* formatted as WHCI.
* real_size: the actual space taken by this event in the buffer.
* We need to keep track of the real size of an event to be able to
* advance the buffer correctly.
* event_size: the size of the event as expected by the core layer
* [OR] the size of the event after filtering. if the filtering
* created a new event in a new memory location then this is
* effectively the size of a new event buffer
*/
void uwb_rc_neh_grok(struct uwb_rc *rc, void *buf, size_t buf_size)
{
struct device *dev = &rc->uwb_dev.dev;
void *itr;
struct uwb_rceb *rceb;
size_t size, real_size, event_size;
int needtofree;
d_fnstart(3, dev, "(rc %p buf %p %zu buf_size)\n", rc, buf, buf_size);
d_printf(2, dev, "groking event block: %zu bytes\n", buf_size);
itr = buf;
size = buf_size;
while (size > 0) {
if (size < sizeof(*rceb)) {
dev_err(dev, "not enough data in event buffer to "
"process incoming events (%zu left, minimum is "
"%zu)\n", size, sizeof(*rceb));
break;
}
rceb = itr;
if (rc->filter_event) {
needtofree = rc->filter_event(rc, &rceb, size,
&real_size, &event_size);
if (needtofree < 0 && needtofree != -ENOANO) {
dev_err(dev, "BUG: Unable to filter event "
"(0x%02x/%04x/%02x) from "
"device. \n", rceb->bEventType,
le16_to_cpu(rceb->wEvent),
rceb->bEventContext);
break;
}
} else
needtofree = -ENOANO;
/* do real processing if there was no filtering or the
* filtering didn't act */
if (needtofree == -ENOANO) {
ssize_t ret = uwb_est_find_size(rc, rceb, size);
if (ret < 0)
break;
if (ret > size) {
dev_err(dev, "BUG: hw sent incomplete event "
"0x%02x/%04x/%02x (%zd bytes), only got "
"%zu bytes. We don't handle that.\n",
rceb->bEventType, le16_to_cpu(rceb->wEvent),
rceb->bEventContext, ret, size);
break;
}
real_size = event_size = ret;
}
uwb_rc_neh_grok_event(rc, rceb, event_size);
if (needtofree == 1)
kfree(rceb);
itr += real_size;
size -= real_size;
d_printf(2, dev, "consumed %zd bytes, %zu left\n",
event_size, size);
}
d_fnend(3, dev, "(rc %p buf %p %zu buf_size) = void\n", rc, buf, buf_size);
}
EXPORT_SYMBOL_GPL(uwb_rc_neh_grok);
/**
* The entity that reads from the device notification/event channel has
* detected an error.
*
* @rc: UWB Radio Controller
* @error: Errno error code
*
*/
void uwb_rc_neh_error(struct uwb_rc *rc, int error)
{
struct uwb_rc_neh *neh, *next;
unsigned long flags;
BUG_ON(error >= 0);
spin_lock_irqsave(&rc->neh_lock, flags);
list_for_each_entry_safe(neh, next, &rc->neh_list, list_node) {
__uwb_rc_neh_rm(rc, neh);
uwb_rc_neh_cb(neh, NULL, error);
}
spin_unlock_irqrestore(&rc->neh_lock, flags);
}
EXPORT_SYMBOL_GPL(uwb_rc_neh_error);
static void uwb_rc_neh_timer(unsigned long arg)
{
struct uwb_rc_neh *neh = (struct uwb_rc_neh *)arg;
struct uwb_rc *rc = neh->rc;
unsigned long flags;
spin_lock_irqsave(&rc->neh_lock, flags);
__uwb_rc_neh_rm(rc, neh);
spin_unlock_irqrestore(&rc->neh_lock, flags);
uwb_rc_neh_cb(neh, NULL, -ETIMEDOUT);
}
/** Initializes the @rc's neh subsystem
*/
void uwb_rc_neh_create(struct uwb_rc *rc)
{
spin_lock_init(&rc->neh_lock);
INIT_LIST_HEAD(&rc->neh_list);
set_bit(0, rc->ctx_bm); /* 0 is reserved (see [WUSB] table 8-65) */
set_bit(0xff, rc->ctx_bm); /* and 0xff is invalid */
rc->ctx_roll = 1;
}
/** Release's the @rc's neh subsystem */
void uwb_rc_neh_destroy(struct uwb_rc *rc)
{
unsigned long flags;
struct uwb_rc_neh *neh, *next;
spin_lock_irqsave(&rc->neh_lock, flags);
list_for_each_entry_safe(neh, next, &rc->neh_list, list_node) {
__uwb_rc_neh_rm(rc, neh);
uwb_rc_neh_put(neh);
}
spin_unlock_irqrestore(&rc->neh_lock, flags);
}

362
drivers/uwb/reset.c Normal file
View File

@ -0,0 +1,362 @@
/*
* Ultra Wide Band
* UWB basic command support and radio reset
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME:
*
* - docs
*
* - Now we are serializing (using the uwb_dev->mutex) the command
* execution; it should be parallelized as much as possible some
* day.
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include "uwb-internal.h"
#define D_LOCAL 0
#include <linux/uwb/debug.h>
/**
* Command result codes (WUSB1.0[T8-69])
*/
static
const char *__strerror[] = {
"success",
"failure",
"hardware failure",
"no more slots",
"beacon is too large",
"invalid parameter",
"unsupported power level",
"time out (wa) or invalid ie data (whci)",
"beacon size exceeded",
"cancelled",
"invalid state",
"invalid size",
"ack not recieved",
"no more asie notification",
};
/** Return a string matching the given error code */
const char *uwb_rc_strerror(unsigned code)
{
if (code == 255)
return "time out";
if (code >= ARRAY_SIZE(__strerror))
return "unknown error";
return __strerror[code];
}
int uwb_rc_cmd_async(struct uwb_rc *rc, const char *cmd_name,
struct uwb_rccb *cmd, size_t cmd_size,
u8 expected_type, u16 expected_event,
uwb_rc_cmd_cb_f cb, void *arg)
{
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rc_neh *neh;
int needtofree = 0;
int result;
uwb_dev_lock(&rc->uwb_dev); /* Protect against rc->priv being removed */
if (rc->priv == NULL) {
uwb_dev_unlock(&rc->uwb_dev);
return -ESHUTDOWN;
}
if (rc->filter_cmd) {
needtofree = rc->filter_cmd(rc, &cmd, &cmd_size);
if (needtofree < 0 && needtofree != -ENOANO) {
dev_err(dev, "%s: filter error: %d\n",
cmd_name, needtofree);
uwb_dev_unlock(&rc->uwb_dev);
return needtofree;
}
}
neh = uwb_rc_neh_add(rc, cmd, expected_type, expected_event, cb, arg);
if (IS_ERR(neh)) {
result = PTR_ERR(neh);
goto out;
}
result = rc->cmd(rc, cmd, cmd_size);
uwb_dev_unlock(&rc->uwb_dev);
if (result < 0)
uwb_rc_neh_rm(rc, neh);
else
uwb_rc_neh_arm(rc, neh);
uwb_rc_neh_put(neh);
out:
if (needtofree == 1)
kfree(cmd);
return result < 0 ? result : 0;
}
EXPORT_SYMBOL_GPL(uwb_rc_cmd_async);
struct uwb_rc_cmd_done_params {
struct completion completion;
struct uwb_rceb *reply;
ssize_t reply_size;
};
static void uwb_rc_cmd_done(struct uwb_rc *rc, void *arg,
struct uwb_rceb *reply, ssize_t reply_size)
{
struct uwb_rc_cmd_done_params *p = (struct uwb_rc_cmd_done_params *)arg;
if (reply_size > 0) {
if (p->reply)
reply_size = min(p->reply_size, reply_size);
else
p->reply = kmalloc(reply_size, GFP_ATOMIC);
if (p->reply)
memcpy(p->reply, reply, reply_size);
else
reply_size = -ENOMEM;
}
p->reply_size = reply_size;
complete(&p->completion);
}
/**
* Generic function for issuing commands to the Radio Control Interface
*
* @rc: UWB Radio Control descriptor
* @cmd_name: Name of the command being issued (for error messages)
* @cmd: Pointer to rccb structure containing the command;
* normally you embed this structure as the first member of
* the full command structure.
* @cmd_size: Size of the whole command buffer pointed to by @cmd.
* @reply: Pointer to where to store the reply
* @reply_size: @reply's size
* @expected_type: Expected type in the return event
* @expected_event: Expected event code in the return event
* @preply: Here a pointer to where the event data is received will
* be stored. Once done with the data, free with kfree().
*
* This function is generic; it works for commands that return a fixed
* and known size or for commands that return a variable amount of data.
*
* If a buffer is provided, that is used, although it could be chopped
* to the maximum size of the buffer. If the buffer is NULL, then one
* be allocated in *preply with the whole contents of the reply.
*
* @rc needs to be referenced
*/
static
ssize_t __uwb_rc_cmd(struct uwb_rc *rc, const char *cmd_name,
struct uwb_rccb *cmd, size_t cmd_size,
struct uwb_rceb *reply, size_t reply_size,
u8 expected_type, u16 expected_event,
struct uwb_rceb **preply)
{
ssize_t result = 0;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rc_cmd_done_params params;
init_completion(&params.completion);
params.reply = reply;
params.reply_size = reply_size;
result = uwb_rc_cmd_async(rc, cmd_name, cmd, cmd_size,
expected_type, expected_event,
uwb_rc_cmd_done, &params);
if (result)
return result;
wait_for_completion(&params.completion);
if (preply)
*preply = params.reply;
if (params.reply_size < 0)
dev_err(dev, "%s: confirmation event 0x%02x/%04x/%02x "
"reception failed: %d\n", cmd_name,
expected_type, expected_event, cmd->bCommandContext,
(int)params.reply_size);
return params.reply_size;
}
/**
* Generic function for issuing commands to the Radio Control Interface
*
* @rc: UWB Radio Control descriptor
* @cmd_name: Name of the command being issued (for error messages)
* @cmd: Pointer to rccb structure containing the command;
* normally you embed this structure as the first member of
* the full command structure.
* @cmd_size: Size of the whole command buffer pointed to by @cmd.
* @reply: Pointer to the beginning of the confirmation event
* buffer. Normally bigger than an 'struct hwarc_rceb'.
* You need to fill out reply->bEventType and reply->wEvent (in
* cpu order) as the function will use them to verify the
* confirmation event.
* @reply_size: Size of the reply buffer
*
* The function checks that the length returned in the reply is at
* least as big as @reply_size; if not, it will be deemed an error and
* -EIO returned.
*
* @rc needs to be referenced
*/
ssize_t uwb_rc_cmd(struct uwb_rc *rc, const char *cmd_name,
struct uwb_rccb *cmd, size_t cmd_size,
struct uwb_rceb *reply, size_t reply_size)
{
struct device *dev = &rc->uwb_dev.dev;
ssize_t result;
result = __uwb_rc_cmd(rc, cmd_name,
cmd, cmd_size, reply, reply_size,
reply->bEventType, reply->wEvent, NULL);
if (result > 0 && result < reply_size) {
dev_err(dev, "%s: not enough data returned for decoding reply "
"(%zu bytes received vs at least %zu needed)\n",
cmd_name, result, reply_size);
result = -EIO;
}
return result;
}
EXPORT_SYMBOL_GPL(uwb_rc_cmd);
/**
* Generic function for issuing commands to the Radio Control
* Interface that return an unknown amount of data
*
* @rc: UWB Radio Control descriptor
* @cmd_name: Name of the command being issued (for error messages)
* @cmd: Pointer to rccb structure containing the command;
* normally you embed this structure as the first member of
* the full command structure.
* @cmd_size: Size of the whole command buffer pointed to by @cmd.
* @expected_type: Expected type in the return event
* @expected_event: Expected event code in the return event
* @preply: Here a pointer to where the event data is received will
* be stored. Once done with the data, free with kfree().
*
* The function checks that the length returned in the reply is at
* least as big as a 'struct uwb_rceb *'; if not, it will be deemed an
* error and -EIO returned.
*
* @rc needs to be referenced
*/
ssize_t uwb_rc_vcmd(struct uwb_rc *rc, const char *cmd_name,
struct uwb_rccb *cmd, size_t cmd_size,
u8 expected_type, u16 expected_event,
struct uwb_rceb **preply)
{
return __uwb_rc_cmd(rc, cmd_name, cmd, cmd_size, NULL, 0,
expected_type, expected_event, preply);
}
EXPORT_SYMBOL_GPL(uwb_rc_vcmd);
/**
* Reset a UWB Host Controller (and all radio settings)
*
* @rc: Host Controller descriptor
* @returns: 0 if ok, < 0 errno code on error
*
* We put the command on kmalloc'ed memory as some arches cannot do
* USB from the stack. The reply event is copied from an stage buffer,
* so it can be in the stack. See WUSB1.0[8.6.2.4] for more details.
*/
int uwb_rc_reset(struct uwb_rc *rc)
{
int result = -ENOMEM;
struct uwb_rc_evt_confirm reply;
struct uwb_rccb *cmd;
size_t cmd_size = sizeof(*cmd);
mutex_lock(&rc->uwb_dev.mutex);
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (cmd == NULL)
goto error_kzalloc;
cmd->bCommandType = UWB_RC_CET_GENERAL;
cmd->wCommand = cpu_to_le16(UWB_RC_CMD_RESET);
reply.rceb.bEventType = UWB_RC_CET_GENERAL;
reply.rceb.wEvent = UWB_RC_CMD_RESET;
result = uwb_rc_cmd(rc, "RESET", cmd, cmd_size,
&reply.rceb, sizeof(reply));
if (result < 0)
goto error_cmd;
if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(&rc->uwb_dev.dev,
"RESET: command execution failed: %s (%d)\n",
uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
result = -EIO;
}
error_cmd:
kfree(cmd);
error_kzalloc:
mutex_unlock(&rc->uwb_dev.mutex);
return result;
}
int uwbd_msg_handle_reset(struct uwb_event *evt)
{
struct uwb_rc *rc = evt->rc;
int ret;
/* Need to prevent the RC hardware module going away while in
the rc->reset() call. */
if (!try_module_get(rc->owner))
return 0;
dev_info(&rc->uwb_dev.dev, "resetting radio controller\n");
ret = rc->reset(rc);
if (ret)
dev_err(&rc->uwb_dev.dev, "failed to reset hardware: %d\n", ret);
module_put(rc->owner);
return ret;
}
/**
* uwb_rc_reset_all - request a reset of the radio controller and PALs
* @rc: the radio controller of the hardware device to be reset.
*
* The full hardware reset of the radio controller and all the PALs
* will be scheduled.
*/
void uwb_rc_reset_all(struct uwb_rc *rc)
{
struct uwb_event *evt;
evt = kzalloc(sizeof(struct uwb_event), GFP_ATOMIC);
if (unlikely(evt == NULL))
return;
evt->rc = __uwb_rc_get(rc); /* will be put by uwbd's uwbd_event_handle() */
evt->ts_jiffies = jiffies;
evt->type = UWB_EVT_TYPE_MSG;
evt->message = UWB_EVT_MSG_RESET;
uwbd_event_queue(evt);
}
EXPORT_SYMBOL_GPL(uwb_rc_reset_all);