Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-26 22:21:42 +00:00
Code Issues Packages Projects Releases Wiki Activity

uwb: add the UWB stack (MLME)

Browse Source 
Most of the MAC Layer Management Entity (MLME) support: address, beacon, IE
and scan management.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
This commit is contained in:
Inaky Perez-Gonzalez 2008-09-17 16:34:08 +01:00 committed by David Vrabel
parent 0612edfd95
commit 22d203ecef
4 changed files with 1721 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

374
drivers/uwb/address.c Normal file
View File

@ -0,0 +1,374 @@
/*
* Ultra Wide Band
* Address 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
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/random.h>
#include <linux/etherdevice.h>
#include <linux/uwb/debug.h>
#include "uwb-internal.h"
/** Device Address Management command */
struct uwb_rc_cmd_dev_addr_mgmt {
struct uwb_rccb rccb;
u8 bmOperationType;
u8 baAddr[6];
} __attribute__((packed));
/**
* Low level command for setting/getting UWB radio's addresses
*
* @hwarc: HWA Radio Control interface instance
* @bmOperationType:
* Set/get, MAC/DEV (see WUSB1.0[8.6.2.2])
* @baAddr: address buffer--assumed to have enough data to hold
* the address type requested.
* @reply: Pointer to reply buffer (can be stack allocated)
* @returns: 0 if ok, < 0 errno code on error.
*
* @cmd has to be allocated because USB cannot grok USB or vmalloc
* buffers depending on your combination of host architecture.
*/
static
int uwb_rc_dev_addr_mgmt(struct uwb_rc *rc,
u8 bmOperationType, const u8 *baAddr,
struct uwb_rc_evt_dev_addr_mgmt *reply)
{
int result;
struct uwb_rc_cmd_dev_addr_mgmt *cmd;
result = -ENOMEM;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (cmd == NULL)
goto error_kzalloc;
cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_DEV_ADDR_MGMT);
cmd->bmOperationType = bmOperationType;
if (baAddr) {
size_t size = 0;
switch (bmOperationType >> 1) {
case 0: size = 2; break;
case 1: size = 6; break;
default: BUG();
}
memcpy(cmd->baAddr, baAddr, size);
}
reply->rceb.bEventType = UWB_RC_CET_GENERAL;
reply->rceb.wEvent = UWB_RC_CMD_DEV_ADDR_MGMT;
result = uwb_rc_cmd(rc, "DEV-ADDR-MGMT",
&cmd->rccb, sizeof(*cmd),
&reply->rceb, sizeof(*reply));
if (result < 0)
goto error_cmd;
if (result < sizeof(*reply)) {
dev_err(&rc->uwb_dev.dev,
"DEV-ADDR-MGMT: not enough data replied: "
"%d vs %zu bytes needed\n", result, sizeof(*reply));
result = -ENOMSG;
} else if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(&rc->uwb_dev.dev,
"DEV-ADDR-MGMT: command execution failed: %s (%d)\n",
uwb_rc_strerror(reply->bResultCode),
reply->bResultCode);
result = -EIO;
} else
result = 0;
error_cmd:
kfree(cmd);
error_kzalloc:
return result;
}
/**
* Set the UWB RC MAC or device address.
*
* @rc: UWB Radio Controller
* @_addr: Pointer to address to write [assumed to be either a
* 'struct uwb_mac_addr *' or a 'struct uwb_dev_addr *'].
* @type: Type of address to set (UWB_ADDR_DEV or UWB_ADDR_MAC).
* @returns: 0 if ok, < 0 errno code on error.
*
* Some anal retentivity here: even if both 'struct
* uwb_{dev,mac}_addr' have the actual byte array in the same offset
* and I could just pass _addr to hwarc_cmd_dev_addr_mgmt(), I prefer
* to use some syntatic sugar in case someday we decide to change the
* format of the structs. The compiler will optimize it out anyway.
*/
static int uwb_rc_addr_set(struct uwb_rc *rc,
const void *_addr, enum uwb_addr_type type)
{
int result;
u8 bmOperationType = 0x1; /* Set address */
const struct uwb_dev_addr *dev_addr = _addr;
const struct uwb_mac_addr *mac_addr = _addr;
struct uwb_rc_evt_dev_addr_mgmt reply;
const u8 *baAddr;
result = -EINVAL;
switch (type) {
case UWB_ADDR_DEV:
baAddr = dev_addr->data;
break;
case UWB_ADDR_MAC:
baAddr = mac_addr->data;
bmOperationType |= 0x2;
break;
default:
return result;
}
return uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &reply);
}
/**
* Get the UWB radio's MAC or device address.
*
* @rc: UWB Radio Controller
* @_addr: Where to write the address data [assumed to be either a
* 'struct uwb_mac_addr *' or a 'struct uwb_dev_addr *'].
* @type: Type of address to get (UWB_ADDR_DEV or UWB_ADDR_MAC).
* @returns: 0 if ok (and *_addr set), < 0 errno code on error.
*
* See comment in uwb_rc_addr_set() about anal retentivity in the
* type handling of the address variables.
*/
static int uwb_rc_addr_get(struct uwb_rc *rc,
void *_addr, enum uwb_addr_type type)
{
int result;
u8 bmOperationType = 0x0; /* Get address */
struct uwb_rc_evt_dev_addr_mgmt evt;
struct uwb_dev_addr *dev_addr = _addr;
struct uwb_mac_addr *mac_addr = _addr;
u8 *baAddr;
result = -EINVAL;
switch (type) {
case UWB_ADDR_DEV:
baAddr = dev_addr->data;
break;
case UWB_ADDR_MAC:
bmOperationType |= 0x2;
baAddr = mac_addr->data;
break;
default:
return result;
}
result = uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &evt);
if (result == 0)
switch (type) {
case UWB_ADDR_DEV:
memcpy(&dev_addr->data, evt.baAddr,
sizeof(dev_addr->data));
break;
case UWB_ADDR_MAC:
memcpy(&mac_addr->data, evt.baAddr,
sizeof(mac_addr->data));
break;
default: /* shut gcc up */
BUG();
}
return result;
}
/** Get @rc's MAC address to @addr */
int uwb_rc_mac_addr_get(struct uwb_rc *rc,
struct uwb_mac_addr *addr) {
return uwb_rc_addr_get(rc, addr, UWB_ADDR_MAC);
}
EXPORT_SYMBOL_GPL(uwb_rc_mac_addr_get);
/** Get @rc's device address to @addr */
int uwb_rc_dev_addr_get(struct uwb_rc *rc,
struct uwb_dev_addr *addr) {
return uwb_rc_addr_get(rc, addr, UWB_ADDR_DEV);
}
EXPORT_SYMBOL_GPL(uwb_rc_dev_addr_get);
/** Set @rc's address to @addr */
int uwb_rc_mac_addr_set(struct uwb_rc *rc,
const struct uwb_mac_addr *addr)
{
int result = -EINVAL;
mutex_lock(&rc->uwb_dev.mutex);
result = uwb_rc_addr_set(rc, addr, UWB_ADDR_MAC);
mutex_unlock(&rc->uwb_dev.mutex);
return result;
}
/** Set @rc's address to @addr */
int uwb_rc_dev_addr_set(struct uwb_rc *rc,
const struct uwb_dev_addr *addr)
{
int result = -EINVAL;
mutex_lock(&rc->uwb_dev.mutex);
result = uwb_rc_addr_set(rc, addr, UWB_ADDR_DEV);
rc->uwb_dev.dev_addr = *addr;
mutex_unlock(&rc->uwb_dev.mutex);
return result;
}
/* Returns !0 if given address is already assigned to device. */
int __uwb_mac_addr_assigned_check(struct device *dev, void *_addr)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_mac_addr *addr = _addr;
if (!uwb_mac_addr_cmp(addr, &uwb_dev->mac_addr))
return !0;
return 0;
}
/* Returns !0 if given address is already assigned to device. */
int __uwb_dev_addr_assigned_check(struct device *dev, void *_addr)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_dev_addr *addr = _addr;
if (!uwb_dev_addr_cmp(addr, &uwb_dev->dev_addr))
return !0;
return 0;
}
/**
* uwb_dev_addr_assign - assigned a generated DevAddr to a radio controller
* @rc: the (local) radio controller device requiring a new DevAddr
*
* A new DevAddr is required when:
* - first setting up a radio controller
* - if the hardware reports a DevAddr conflict
*
* The DevAddr is randomly generated in the generated DevAddr range
* [0x100, 0xfeff]. The number of devices in a beacon group is limited
* by mMaxBPLength (96) so this address space will never be exhausted.
*
* [ECMA-368] 17.1.1, 17.16.
*/
int uwb_rc_dev_addr_assign(struct uwb_rc *rc)
{
struct uwb_dev_addr new_addr;
do {
get_random_bytes(new_addr.data, sizeof(new_addr.data));
} while (new_addr.data[0] == 0x00 || new_addr.data[0] == 0xff
|| __uwb_dev_addr_assigned(rc, &new_addr));
return uwb_rc_dev_addr_set(rc, &new_addr);
}
/**
* uwbd_evt_handle_rc_dev_addr_conflict - handle a DEV_ADDR_CONFLICT event
* @evt: the DEV_ADDR_CONFLICT notification from the radio controller
*
* A new (non-conflicting) DevAddr is assigned to the radio controller.
*
* [ECMA-368] 17.1.1.1.
*/
int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt)
{
struct uwb_rc *rc = evt->rc;
return uwb_rc_dev_addr_assign(rc);
}
/*
* Print the 48-bit EUI MAC address of the radio controller when
* reading /sys/class/uwb_rc/XX/mac_address
*/
static ssize_t uwb_rc_mac_addr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_rc *rc = uwb_dev->rc;
struct uwb_mac_addr addr;
ssize_t result;
mutex_lock(&rc->uwb_dev.mutex);
result = uwb_rc_addr_get(rc, &addr, UWB_ADDR_MAC);
mutex_unlock(&rc->uwb_dev.mutex);
if (result >= 0) {
result = uwb_mac_addr_print(buf, UWB_ADDR_STRSIZE, &addr);
buf[result++] = '\n';
}
return result;
}
/*
* Parse a 48 bit address written to /sys/class/uwb_rc/XX/mac_address
* and if correct, set it.
*/
static ssize_t uwb_rc_mac_addr_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_rc *rc = uwb_dev->rc;
struct uwb_mac_addr addr;
ssize_t result;
result = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx\n",
&addr.data[0], &addr.data[1], &addr.data[2],
&addr.data[3], &addr.data[4], &addr.data[5]);
if (result != 6) {
result = -EINVAL;
goto out;
}
if (is_multicast_ether_addr(addr.data)) {
dev_err(&rc->uwb_dev.dev, "refusing to set multicast "
"MAC address %s\n", buf);
result = -EINVAL;
goto out;
}
result = uwb_rc_mac_addr_set(rc, &addr);
if (result == 0)
rc->uwb_dev.mac_addr = addr;
out:
return result < 0 ? result : size;
}
DEVICE_ATTR(mac_address, S_IRUGO | S_IWUSR, uwb_rc_mac_addr_show, uwb_rc_mac_addr_store);
/** Print @addr to @buf, @return bytes written */
size_t __uwb_addr_print(char *buf, size_t buf_size, const unsigned char *addr,
int type)
{
size_t result;
if (type)
result = scnprintf(buf, buf_size,
"%02x:%02x:%02x:%02x:%02x:%02x",
addr[0], addr[1], addr[2],
addr[3], addr[4], addr[5]);
else
result = scnprintf(buf, buf_size, "%02x:%02x",
addr[1], addr[0]);
return result;
}
EXPORT_SYMBOL_GPL(__uwb_addr_print);

644
drivers/uwb/beacon.c Normal file
View File

@ -0,0 +1,644 @@
/*
* Ultra Wide Band
* Beacon 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
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/kdev_t.h>
#include "uwb-internal.h"
#define D_LOCAL 0
#include <linux/uwb/debug.h>
/** Start Beaconing command structure */
struct uwb_rc_cmd_start_beacon {
struct uwb_rccb rccb;
__le16 wBPSTOffset;
u8 bChannelNumber;
} __attribute__((packed));
static int uwb_rc_start_beacon(struct uwb_rc *rc, u16 bpst_offset, u8 channel)
{
int result;
struct uwb_rc_cmd_start_beacon *cmd;
struct uwb_rc_evt_confirm reply;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (cmd == NULL)
return -ENOMEM;
cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_START_BEACON);
cmd->wBPSTOffset = cpu_to_le16(bpst_offset);
cmd->bChannelNumber = channel;
reply.rceb.bEventType = UWB_RC_CET_GENERAL;
reply.rceb.wEvent = UWB_RC_CMD_START_BEACON;
result = uwb_rc_cmd(rc, "START-BEACON", &cmd->rccb, sizeof(*cmd),
&reply.rceb, sizeof(reply));
if (result < 0)
goto error_cmd;
if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(&rc->uwb_dev.dev,
"START-BEACON: command execution failed: %s (%d)\n",
uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
result = -EIO;
}
error_cmd:
kfree(cmd);
return result;
}
static int uwb_rc_stop_beacon(struct uwb_rc *rc)
{
int result;
struct uwb_rccb *cmd;
struct uwb_rc_evt_confirm reply;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (cmd == NULL)
return -ENOMEM;
cmd->bCommandType = UWB_RC_CET_GENERAL;
cmd->wCommand = cpu_to_le16(UWB_RC_CMD_STOP_BEACON);
reply.rceb.bEventType = UWB_RC_CET_GENERAL;
reply.rceb.wEvent = UWB_RC_CMD_STOP_BEACON;
result = uwb_rc_cmd(rc, "STOP-BEACON", cmd, sizeof(*cmd),
&reply.rceb, sizeof(reply));
if (result < 0)
goto error_cmd;
if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(&rc->uwb_dev.dev,
"STOP-BEACON: command execution failed: %s (%d)\n",
uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
result = -EIO;
}
error_cmd:
kfree(cmd);
return result;
}
/*
* Start/stop beacons
*
* @rc: UWB Radio Controller to operate on
* @channel: UWB channel on which to beacon (WUSB[table
* 5-12]). If -1, stop beaconing.
* @bpst_offset: Beacon Period Start Time offset; FIXME-do zero
*
* According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB
* of a SET IE command after the device sent the first beacon that includes
* the IEs specified in the SET IE command. So, after we start beaconing we
* check if there is anything in the IE cache and call the SET IE command
* if needed.
*/
int uwb_rc_beacon(struct uwb_rc *rc, int channel, unsigned bpst_offset)
{
int result;
struct device *dev = &rc->uwb_dev.dev;
mutex_lock(&rc->uwb_dev.mutex);
if (channel < 0)
channel = -1;
if (channel == -1)
result = uwb_rc_stop_beacon(rc);
else {
/* channel >= 0...dah */
result = uwb_rc_start_beacon(rc, bpst_offset, channel);
if (result < 0)
goto out_up;
if (le16_to_cpu(rc->ies->wIELength) > 0) {
result = uwb_rc_set_ie(rc, rc->ies);
if (result < 0) {
dev_err(dev, "Cannot set new IE on device: "
"%d\n", result);
result = uwb_rc_stop_beacon(rc);
channel = -1;
bpst_offset = 0;
} else
result = 0;
}
}
if (result < 0)
goto out_up;
rc->beaconing = channel;
uwb_notify(rc, NULL, uwb_bg_joined(rc) ? UWB_NOTIF_BG_JOIN : UWB_NOTIF_BG_LEAVE);
out_up:
mutex_unlock(&rc->uwb_dev.mutex);
return result;
}
/*
* Beacon cache
*
* The purpose of this is to speed up the lookup of becon information
* when a new beacon arrives. The UWB Daemon uses it also to keep a
* tab of which devices are in radio distance and which not. When a
* device's beacon stays present for more than a certain amount of
* time, it is considered a new, usable device. When a beacon ceases
* to be received for a certain amount of time, it is considered that
* the device is gone.
*
* FIXME: use an allocator for the entries
* FIXME: use something faster for search than a list
*/
struct uwb_beca uwb_beca = {
.list = LIST_HEAD_INIT(uwb_beca.list),
.mutex = __MUTEX_INITIALIZER(uwb_beca.mutex)
};
void uwb_bce_kfree(struct kref *_bce)
{
struct uwb_beca_e *bce = container_of(_bce, struct uwb_beca_e, refcnt);
kfree(bce->be);
kfree(bce);
}
/* Find a beacon by dev addr in the cache */
static
struct uwb_beca_e *__uwb_beca_find_bydev(const struct uwb_dev_addr *dev_addr)
{
struct uwb_beca_e *bce, *next;
list_for_each_entry_safe(bce, next, &uwb_beca.list, node) {
d_printf(6, NULL, "looking for addr %02x:%02x in %02x:%02x\n",
dev_addr->data[0], dev_addr->data[1],
bce->dev_addr.data[0], bce->dev_addr.data[1]);
if (!memcmp(&bce->dev_addr, dev_addr, sizeof(bce->dev_addr)))
goto out;
}
bce = NULL;
out:
return bce;
}
/* Find a beacon by dev addr in the cache */
static
struct uwb_beca_e *__uwb_beca_find_bymac(const struct uwb_mac_addr *mac_addr)
{
struct uwb_beca_e *bce, *next;
list_for_each_entry_safe(bce, next, &uwb_beca.list, node) {
if (!memcmp(bce->mac_addr, mac_addr->data,
sizeof(bce->mac_addr)))
goto out;
}
bce = NULL;
out:
return bce;
}
/**
* uwb_dev_get_by_devaddr - get a UWB device with a specific DevAddr
* @rc: the radio controller that saw the device
* @devaddr: DevAddr of the UWB device to find
*
* There may be more than one matching device (in the case of a
* DevAddr conflict), but only the first one is returned.
*/
struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
const struct uwb_dev_addr *devaddr)
{
struct uwb_dev *found = NULL;
struct uwb_beca_e *bce;
mutex_lock(&uwb_beca.mutex);
bce = __uwb_beca_find_bydev(devaddr);
if (bce)
found = uwb_dev_try_get(rc, bce->uwb_dev);
mutex_unlock(&uwb_beca.mutex);
return found;
}
/**
* uwb_dev_get_by_macaddr - get a UWB device with a specific EUI-48
* @rc: the radio controller that saw the device
* @devaddr: EUI-48 of the UWB device to find
*/
struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
const struct uwb_mac_addr *macaddr)
{
struct uwb_dev *found = NULL;
struct uwb_beca_e *bce;
mutex_lock(&uwb_beca.mutex);
bce = __uwb_beca_find_bymac(macaddr);
if (bce)
found = uwb_dev_try_get(rc, bce->uwb_dev);
mutex_unlock(&uwb_beca.mutex);
return found;
}
/* Initialize a beacon cache entry */
static void uwb_beca_e_init(struct uwb_beca_e *bce)
{
mutex_init(&bce->mutex);
kref_init(&bce->refcnt);
stats_init(&bce->lqe_stats);
stats_init(&bce->rssi_stats);
}
/*
* Add a beacon to the cache
*
* @be: Beacon event information
* @bf: Beacon frame (part of b, really)
* @ts_jiffies: Timestamp (in jiffies) when the beacon was received
*/
struct uwb_beca_e *__uwb_beca_add(struct uwb_rc_evt_beacon *be,
struct uwb_beacon_frame *bf,
unsigned long ts_jiffies)
{
struct uwb_beca_e *bce;
bce = kzalloc(sizeof(*bce), GFP_KERNEL);
if (bce == NULL)
return NULL;
uwb_beca_e_init(bce);
bce->ts_jiffies = ts_jiffies;
bce->uwb_dev = NULL;
list_add(&bce->node, &uwb_beca.list);
return bce;
}
/*
* Wipe out beacon entries that became stale
*
* Remove associated devicest too.
*/
void uwb_beca_purge(void)
{
struct uwb_beca_e *bce, *next;
unsigned long now = jiffies;
mutex_lock(&uwb_beca.mutex);
list_for_each_entry_safe(bce, next, &uwb_beca.list, node) {
if (now - bce->ts_jiffies
> msecs_to_jiffies(beacon_timeout_ms)) {
uwbd_dev_offair(bce);
list_del(&bce->node);
uwb_bce_put(bce);
}
}
mutex_unlock(&uwb_beca.mutex);
}
/* Clean up the whole beacon cache. Called on shutdown */
void uwb_beca_release(void)
{
struct uwb_beca_e *bce, *next;
mutex_lock(&uwb_beca.mutex);
list_for_each_entry_safe(bce, next, &uwb_beca.list, node) {
list_del(&bce->node);
uwb_bce_put(bce);
}
mutex_unlock(&uwb_beca.mutex);
}
static void uwb_beacon_print(struct uwb_rc *rc, struct uwb_rc_evt_beacon *be,
struct uwb_beacon_frame *bf)
{
char macbuf[UWB_ADDR_STRSIZE];
char devbuf[UWB_ADDR_STRSIZE];
char dstbuf[UWB_ADDR_STRSIZE];
uwb_mac_addr_print(macbuf, sizeof(macbuf), &bf->Device_Identifier);
uwb_dev_addr_print(devbuf, sizeof(devbuf), &bf->hdr.SrcAddr);
uwb_dev_addr_print(dstbuf, sizeof(dstbuf), &bf->hdr.DestAddr);
dev_info(&rc->uwb_dev.dev,
"BEACON from %s to %s (ch%u offset %u slot %u MAC %s)\n",
devbuf, dstbuf, be->bChannelNumber, be->wBPSTOffset,
bf->Beacon_Slot_Number, macbuf);
}
/*
* @bce: beacon cache entry, referenced
*/
ssize_t uwb_bce_print_IEs(struct uwb_dev *uwb_dev, struct uwb_beca_e *bce,
char *buf, size_t size)
{
ssize_t result = 0;
struct uwb_rc_evt_beacon *be;
struct uwb_beacon_frame *bf;
struct uwb_buf_ctx ctx = {
.buf = buf,
.bytes = 0,
.size = size
};
mutex_lock(&bce->mutex);
be = bce->be;
if (be == NULL)
goto out;
bf = (void *) be->BeaconInfo;
uwb_ie_for_each(uwb_dev, uwb_ie_dump_hex, &ctx,
bf->IEData, be->wBeaconInfoLength - sizeof(*bf));
result = ctx.bytes;
out:
mutex_unlock(&bce->mutex);
return result;
}
/*
* Verify that the beacon event, frame and IEs are ok
*/
static int uwb_verify_beacon(struct uwb_rc *rc, struct uwb_event *evt,
struct uwb_rc_evt_beacon *be)
{
int result = -EINVAL;
struct uwb_beacon_frame *bf;
struct device *dev = &rc->uwb_dev.dev;
/* Is there enough data to decode a beacon frame? */
if (evt->notif.size < sizeof(*be) + sizeof(*bf)) {
dev_err(dev, "BEACON event: Not enough data to decode "
"(%zu vs %zu bytes needed)\n", evt->notif.size,
sizeof(*be) + sizeof(*bf));
goto error;
}
/* FIXME: make sure beacon frame IEs are fine and that the whole thing
* is consistent */
result = 0;
error:
return result;
}
/*
* Handle UWB_RC_EVT_BEACON events
*
* We check the beacon cache to see how the received beacon fares. If
* is there already we refresh the timestamp. If not we create a new
* entry.
*
* According to the WHCI and WUSB specs, only one beacon frame is
* allowed per notification block, so we don't bother about scanning
* for more.
*/
int uwbd_evt_handle_rc_beacon(struct uwb_event *evt)
{
int result = -EINVAL;
struct uwb_rc *rc;
struct uwb_rc_evt_beacon *be;
struct uwb_beacon_frame *bf;
struct uwb_beca_e *bce;
struct device *dev = &evt->rc->uwb_dev.dev;
unsigned long last_ts;
rc = evt->rc;
be = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon, rceb);
result = uwb_verify_beacon(rc, evt, be);
if (result < 0)
return result;
/* Ignore beacon if it is from an alien. */
if (be->bBeaconType == UWB_RC_BEACON_TYPE_OL_ALIEN ||
be->bBeaconType == UWB_RC_BEACON_TYPE_NOL_ALIEN) {
if (printk_ratelimit())
dev_err(dev, "BEACON received from ALIEN. Action? \n");
result = -ENOSYS;
return 0;
}
bf = (struct uwb_beacon_frame *) be->BeaconInfo;
/*
* Drop beacons from devices with a NULL EUI-48 -- they cannot
* be uniquely identified.
*
* It's expected that these will all be WUSB devices and they
* have a WUSB specific connection method so ignoring them
* here shouldn't be a problem.
*/
if (uwb_mac_addr_bcast(&bf->Device_Identifier))
return 0;
mutex_lock(&uwb_beca.mutex);
bce = __uwb_beca_find_bymac(&bf->Device_Identifier);
if (bce == NULL) {
/* Not in there, a new device is pinging */
uwb_beacon_print(evt->rc, be, bf);
bce = __uwb_beca_add(be, bf, evt->ts_jiffies);
if (bce == NULL) {
mutex_unlock(&uwb_beca.mutex);
return -ENOMEM;
}
}
mutex_unlock(&uwb_beca.mutex);
mutex_lock(&bce->mutex);
/* purge old beacon data */
kfree(bce->be);
last_ts = bce->ts_jiffies;
/* Update commonly used fields */
bce->ts_jiffies = evt->ts_jiffies;
bce->be = be;
bce->dev_addr = bf->hdr.SrcAddr;
bce->mac_addr = &bf->Device_Identifier;
be->wBPSTOffset = le16_to_cpu(be->wBPSTOffset);
be->wBeaconInfoLength = le16_to_cpu(be->wBeaconInfoLength);
stats_add_sample(&bce->lqe_stats, be->bLQI - 7);
stats_add_sample(&bce->rssi_stats, be->bRSSI + 18);
/*
* This might be a beacon from a new device.
*/
if (bce->uwb_dev == NULL)
uwbd_dev_onair(evt->rc, bce);
mutex_unlock(&bce->mutex);
return 1; /* we keep the event data */
}
/*
* Handle UWB_RC_EVT_BEACON_SIZE events
*
* XXXXX
*/
int uwbd_evt_handle_rc_beacon_size(struct uwb_event *evt)
{
int result = -EINVAL;
struct device *dev = &evt->rc->uwb_dev.dev;
struct uwb_rc_evt_beacon_size *bs;
/* Is there enough data to decode the event? */
if (evt->notif.size < sizeof(*bs)) {
dev_err(dev, "BEACON SIZE notification: Not enough data to "
"decode (%zu vs %zu bytes needed)\n",
evt->notif.size, sizeof(*bs));
goto error;
}
bs = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon_size, rceb);
if (0)
dev_info(dev, "Beacon size changed to %u bytes "
"(FIXME: action?)\n", le16_to_cpu(bs->wNewBeaconSize));
else {
/* temporary hack until we do something with this message... */
static unsigned count;
if (++count % 1000 == 0)
dev_info(dev, "Beacon size changed %u times "
"(FIXME: action?)\n", count);
}
result = 0;
error:
return result;
}
/**
* uwbd_evt_handle_rc_bp_slot_change - handle a BP_SLOT_CHANGE event
* @evt: the BP_SLOT_CHANGE notification from the radio controller
*
* If the event indicates that no beacon period slots were available
* then radio controller has transitioned to a non-beaconing state.
* Otherwise, simply save the current beacon slot.
*/
int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *evt)
{
struct uwb_rc *rc = evt->rc;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rc_evt_bp_slot_change *bpsc;
if (evt->notif.size < sizeof(*bpsc)) {
dev_err(dev, "BP SLOT CHANGE event: Not enough data\n");
return -EINVAL;
}
bpsc = container_of(evt->notif.rceb, struct uwb_rc_evt_bp_slot_change, rceb);
mutex_lock(&rc->uwb_dev.mutex);
if (uwb_rc_evt_bp_slot_change_no_slot(bpsc)) {
dev_info(dev, "stopped beaconing: No free slots in BP\n");
rc->beaconing = -1;
} else
rc->uwb_dev.beacon_slot = uwb_rc_evt_bp_slot_change_slot_num(bpsc);
mutex_unlock(&rc->uwb_dev.mutex);
return 0;
}
/**
* Handle UWB_RC_EVT_BPOIE_CHANGE events
*
* XXXXX
*/
struct uwb_ie_bpo {
struct uwb_ie_hdr hdr;
u8 bp_length;
u8 data[];
} __attribute__((packed));
int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *evt)
{
int result = -EINVAL;
struct device *dev = &evt->rc->uwb_dev.dev;
struct uwb_rc_evt_bpoie_change *bpoiec;
struct uwb_ie_bpo *bpoie;
static unsigned count; /* FIXME: this is a temp hack */
size_t iesize;
/* Is there enough data to decode it? */
if (evt->notif.size < sizeof(*bpoiec)) {
dev_err(dev, "BPOIEC notification: Not enough data to "
"decode (%zu vs %zu bytes needed)\n",
evt->notif.size, sizeof(*bpoiec));
goto error;
}
bpoiec = container_of(evt->notif.rceb, struct uwb_rc_evt_bpoie_change, rceb);
iesize = le16_to_cpu(bpoiec->wBPOIELength);
if (iesize < sizeof(*bpoie)) {
dev_err(dev, "BPOIEC notification: Not enough IE data to "
"decode (%zu vs %zu bytes needed)\n",
iesize, sizeof(*bpoie));
goto error;
}
if (++count % 1000 == 0) /* Lame placeholder */
dev_info(dev, "BPOIE: %u changes received\n", count);
/*
* FIXME: At this point we should go over all the IEs in the
* bpoiec->BPOIE array and act on each.
*/
result = 0;
error:
return result;
}
/**
* uwb_bg_joined - is the RC in a beacon group?
* @rc: the radio controller
*
* Returns true if the radio controller is in a beacon group (even if
* it's the sole member).
*/
int uwb_bg_joined(struct uwb_rc *rc)
{
return rc->beaconing != -1;
}
EXPORT_SYMBOL_GPL(uwb_bg_joined);
/*
* Print beaconing state.
*/
static ssize_t uwb_rc_beacon_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_rc *rc = uwb_dev->rc;
ssize_t result;
mutex_lock(&rc->uwb_dev.mutex);
result = sprintf(buf, "%d\n", rc->beaconing);
mutex_unlock(&rc->uwb_dev.mutex);
return result;
}
/*
* Start beaconing on the specified channel, or stop beaconing.
*
* The BPST offset of when to start searching for a beacon group to
* join may be specified.
*/
static ssize_t uwb_rc_beacon_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_rc *rc = uwb_dev->rc;
int channel;
unsigned bpst_offset = 0;
ssize_t result = -EINVAL;
result = sscanf(buf, "%d %u\n", &channel, &bpst_offset);
if (result >= 1)
result = uwb_rc_beacon(rc, channel, bpst_offset);
return result < 0 ? result : size;
}
DEVICE_ATTR(beacon, S_IRUGO | S_IWUSR, uwb_rc_beacon_show, uwb_rc_beacon_store);

570
drivers/uwb/ie.c Normal file
View File

@ -0,0 +1,570 @@
/*
* Ultra Wide Band
* Information Element Handling
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
* Reinette Chatre <reinette.chatre@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
*/
#include "uwb-internal.h"
#define D_LOCAL 0
#include <linux/uwb/debug.h>
/**
* uwb_ie_next - get the next IE in a buffer
* @ptr: start of the buffer containing the IE data
* @len: length of the buffer
*
* Both @ptr and @len are updated so subsequent calls to uwb_ie_next()
* will get the next IE.
*
* NULL is returned (and @ptr and @len will not be updated) if there
* are no more IEs in the buffer or the buffer is too short.
*/
struct uwb_ie_hdr *uwb_ie_next(void **ptr, size_t *len)
{
struct uwb_ie_hdr *hdr;
size_t ie_len;
if (*len < sizeof(struct uwb_ie_hdr))
return NULL;
hdr = *ptr;
ie_len = sizeof(struct uwb_ie_hdr) + hdr->length;
if (*len < ie_len)
return NULL;
*ptr += ie_len;
*len -= ie_len;
return hdr;
}
EXPORT_SYMBOL_GPL(uwb_ie_next);
/**
* Get the IEs that a radio controller is sending in its beacon
*
* @uwb_rc: UWB Radio Controller
* @returns: Size read from the system
*
* We don't need to lock the uwb_rc's mutex because we don't modify
* anything. Once done with the iedata buffer, call
* uwb_rc_ie_release(iedata). Don't call kfree on it.
*/
ssize_t uwb_rc_get_ie(struct uwb_rc *uwb_rc, struct uwb_rc_evt_get_ie **pget_ie)
{
ssize_t result;
struct device *dev = &uwb_rc->uwb_dev.dev;
struct uwb_rccb *cmd = NULL;
struct uwb_rceb *reply = NULL;
struct uwb_rc_evt_get_ie *get_ie;
d_fnstart(3, dev, "(%p, %p)\n", uwb_rc, pget_ie);
result = -ENOMEM;
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_GET_IE);
result = uwb_rc_vcmd(uwb_rc, "GET_IE", cmd, sizeof(*cmd),
UWB_RC_CET_GENERAL, UWB_RC_CMD_GET_IE,
&reply);
if (result < 0)
goto error_cmd;
get_ie = container_of(reply, struct uwb_rc_evt_get_ie, rceb);
if (result < sizeof(*get_ie)) {
dev_err(dev, "not enough data returned for decoding GET IE "
"(%zu bytes received vs %zu needed)\n",
result, sizeof(*get_ie));
result = -EINVAL;
} else if (result < sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength)) {
dev_err(dev, "not enough data returned for decoding GET IE "
"payload (%zu bytes received vs %zu needed)\n", result,
sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength));
result = -EINVAL;
} else
*pget_ie = get_ie;
error_cmd:
kfree(cmd);
error_kzalloc:
d_fnend(3, dev, "(%p, %p) = %d\n", uwb_rc, pget_ie, (int)result);
return result;
}
EXPORT_SYMBOL_GPL(uwb_rc_get_ie);
/*
* Given a pointer to an IE, print it in ASCII/hex followed by a new line
*
* @ie_hdr: pointer to the IE header. Length is in there, and it is
* guaranteed that the ie_hdr->length bytes following it are
* safely accesible.
*
* @_data: context data passed from uwb_ie_for_each(), an struct output_ctx
*/
int uwb_ie_dump_hex(struct uwb_dev *uwb_dev, const struct uwb_ie_hdr *ie_hdr,
size_t offset, void *_ctx)
{
struct uwb_buf_ctx *ctx = _ctx;
const u8 *pl = (void *)(ie_hdr + 1);
u8 pl_itr;
ctx->bytes += scnprintf(ctx->buf + ctx->bytes, ctx->size - ctx->bytes,
"%02x %02x ", (unsigned) ie_hdr->element_id,
(unsigned) ie_hdr->length);
pl_itr = 0;
while (pl_itr < ie_hdr->length && ctx->bytes < ctx->size)
ctx->bytes += scnprintf(ctx->buf + ctx->bytes,
ctx->size - ctx->bytes,
"%02x ", (unsigned) pl[pl_itr++]);
if (ctx->bytes < ctx->size)
ctx->buf[ctx->bytes++] = '\n';
return 0;
}
EXPORT_SYMBOL_GPL(uwb_ie_dump_hex);
/**
* Verify that a pointer in a buffer points to valid IE
*
* @start: pointer to start of buffer in which IE appears
* @itr: pointer to IE inside buffer that will be verified
* @top: pointer to end of buffer
*
* @returns: 0 if IE is valid, <0 otherwise
*
* Verification involves checking that the buffer can contain a
* header and the amount of data reported in the IE header can be found in
* the buffer.
*/
static
int uwb_rc_ie_verify(struct uwb_dev *uwb_dev, const void *start,
const void *itr, const void *top)
{
struct device *dev = &uwb_dev->dev;
const struct uwb_ie_hdr *ie_hdr;
if (top - itr < sizeof(*ie_hdr)) {
dev_err(dev, "Bad IE: no data to decode header "
"(%zu bytes left vs %zu needed) at offset %zu\n",
top - itr, sizeof(*ie_hdr), itr - start);
return -EINVAL;
}
ie_hdr = itr;
itr += sizeof(*ie_hdr);
if (top - itr < ie_hdr->length) {
dev_err(dev, "Bad IE: not enough data for payload "
"(%zu bytes left vs %zu needed) at offset %zu\n",
top - itr, (size_t)ie_hdr->length,
(void *)ie_hdr - start);
return -EINVAL;
}
return 0;
}
/**
* Walk a buffer filled with consecutive IE's a buffer
*
* @uwb_dev: UWB device this IEs belong to (for err messages mainly)
*
* @fn: function to call with each IE; if it returns 0, we keep
* traversing the buffer. If it returns !0, we'll stop and return
* that value.
*
* @data: pointer passed to @fn
*
* @buf: buffer where the consecutive IEs are located
*
* @size: size of @buf
*
* Each IE is checked for basic correctness (there is space left for
* the header and the payload). If that test is failed, we stop
* processing. For every good IE, @fn is called.
*/
ssize_t uwb_ie_for_each(struct uwb_dev *uwb_dev, uwb_ie_f fn, void *data,
const void *buf, size_t size)
{
ssize_t result = 0;
const struct uwb_ie_hdr *ie_hdr;
const void *itr = buf, *top = itr + size;
while (itr < top) {
if (uwb_rc_ie_verify(uwb_dev, buf, itr, top) != 0)
break;
ie_hdr = itr;
itr += sizeof(*ie_hdr) + ie_hdr->length;
result = fn(uwb_dev, ie_hdr, itr - buf, data);
if (result != 0)
break;
}
return result;
}
EXPORT_SYMBOL_GPL(uwb_ie_for_each);
/**
* Replace all IEs currently being transmitted by a device
*
* @cmd: pointer to the SET-IE command with the IEs to set
* @size: size of @buf
*/
int uwb_rc_set_ie(struct uwb_rc *rc, struct uwb_rc_cmd_set_ie *cmd)
{
int result;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rc_evt_set_ie reply;
reply.rceb.bEventType = UWB_RC_CET_GENERAL;
reply.rceb.wEvent = UWB_RC_CMD_SET_IE;
result = uwb_rc_cmd(rc, "SET-IE", &cmd->rccb,
sizeof(*cmd) + le16_to_cpu(cmd->wIELength),
&reply.rceb, sizeof(reply));
if (result < 0)
goto error_cmd;
else if (result != sizeof(reply)) {
dev_err(dev, "SET-IE: not enough data to decode reply "
"(%d bytes received vs %zu needed)\n",
result, sizeof(reply));
result = -EIO;
} else if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(dev, "SET-IE: command execution failed: %s (%d)\n",
uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
result = -EIO;
} else
result = 0;
error_cmd:
return result;
}
/**
* Determine by IE id if IE is host settable
* WUSB 1.0 [8.6.2.8 Table 8.85]
*
* EXCEPTION:
* All but UWB_IE_WLP appears in Table 8.85 from WUSB 1.0. Setting this IE
* is required for the WLP substack to perform association with its WSS so
* we hope that the WUSB spec will be changed to reflect this.
*/
static
int uwb_rc_ie_is_host_settable(enum uwb_ie element_id)
{
if (element_id == UWB_PCA_AVAILABILITY ||
element_id == UWB_BP_SWITCH_IE ||
element_id == UWB_MAC_CAPABILITIES_IE ||
element_id == UWB_PHY_CAPABILITIES_IE ||
element_id == UWB_APP_SPEC_PROBE_IE ||
element_id == UWB_IDENTIFICATION_IE ||
element_id == UWB_MASTER_KEY_ID_IE ||
element_id == UWB_IE_WLP ||
element_id == UWB_APP_SPEC_IE)
return 1;
return 0;
}
/**
* Extract Host Settable IEs from IE
*
* @ie_data: pointer to buffer containing all IEs
* @size: size of buffer
*
* @returns: length of buffer that only includes host settable IEs
*
* Given a buffer of IEs we move all Host Settable IEs to front of buffer
* by overwriting the IEs that are not Host Settable.
* Buffer length is adjusted accordingly.
*/
static
ssize_t uwb_rc_parse_host_settable_ie(struct uwb_dev *uwb_dev,
void *ie_data, size_t size)
{
size_t new_len = size;
struct uwb_ie_hdr *ie_hdr;
size_t ie_length;
void *itr = ie_data, *top = itr + size;
while (itr < top) {
if (uwb_rc_ie_verify(uwb_dev, ie_data, itr, top) != 0)
break;
ie_hdr = itr;
ie_length = sizeof(*ie_hdr) + ie_hdr->length;
if (uwb_rc_ie_is_host_settable(ie_hdr->element_id)) {
itr += ie_length;
} else {
memmove(itr, itr + ie_length, top - (itr + ie_length));
new_len -= ie_length;
top -= ie_length;
}
}
return new_len;
}
/* Cleanup the whole IE management subsystem */
void uwb_rc_ie_init(struct uwb_rc *uwb_rc)
{
mutex_init(&uwb_rc->ies_mutex);
}
/**
* Set up cache for host settable IEs currently being transmitted
*
* First we just call GET-IE to get the current IEs being transmitted
* (or we workaround and pretend we did) and (because the format is
* the same) reuse that as the IE cache (with the command prefix, as
* explained in 'struct uwb_rc').
*
* @returns: size of cache created
*/
ssize_t uwb_rc_ie_setup(struct uwb_rc *uwb_rc)
{
struct device *dev = &uwb_rc->uwb_dev.dev;
ssize_t result;
size_t capacity;
struct uwb_rc_evt_get_ie *ie_info;
d_fnstart(3, dev, "(%p)\n", uwb_rc);
mutex_lock(&uwb_rc->ies_mutex);
result = uwb_rc_get_ie(uwb_rc, &ie_info);
if (result < 0)
goto error_get_ie;
capacity = result;
d_printf(5, dev, "Got IEs %zu bytes (%zu long at %p)\n", result,
(size_t)le16_to_cpu(ie_info->wIELength), ie_info);
/* Remove IEs that host should not set. */
result = uwb_rc_parse_host_settable_ie(&uwb_rc->uwb_dev,
ie_info->IEData, le16_to_cpu(ie_info->wIELength));
if (result < 0)
goto error_parse;
d_printf(5, dev, "purged non-settable IEs to %zu bytes\n", result);
uwb_rc->ies = (void *) ie_info;
uwb_rc->ies->rccb.bCommandType = UWB_RC_CET_GENERAL;
uwb_rc->ies->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SET_IE);
uwb_rc->ies_capacity = capacity;
d_printf(5, dev, "IE cache at %p %zu bytes, %zu capacity\n",
ie_info, result, capacity);
result = 0;
error_parse:
error_get_ie:
mutex_unlock(&uwb_rc->ies_mutex);
d_fnend(3, dev, "(%p) = %zu\n", uwb_rc, result);
return result;
}
/* Cleanup the whole IE management subsystem */
void uwb_rc_ie_release(struct uwb_rc *uwb_rc)
{
kfree(uwb_rc->ies);
uwb_rc->ies = NULL;
uwb_rc->ies_capacity = 0;
}
static
int __acc_size(struct uwb_dev *uwb_dev, const struct uwb_ie_hdr *ie_hdr,
size_t offset, void *_ctx)
{
size_t *acc_size = _ctx;
*acc_size += sizeof(*ie_hdr) + ie_hdr->length;
d_printf(6, &uwb_dev->dev, "new acc size %zu\n", *acc_size);
return 0;
}
/**
* Add a new IE to IEs currently being transmitted by device
*
* @ies: the buffer containing the new IE or IEs to be added to
* the device's beacon. The buffer will be verified for
* consistence (meaning the headers should be right) and
* consistent with the buffer size.
* @size: size of @ies (in bytes, total buffer size)
* @returns: 0 if ok, <0 errno code on error
*
* According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB
* after the device sent the first beacon that includes the IEs specified
* in the SET IE command. We thus cannot send this command if the device is
* not beaconing. Instead, a SET IE command will be sent later right after
* we start beaconing.
*
* Setting an IE on the device will overwrite all current IEs in device. So
* we take the current IEs being transmitted by the device, append the
* new one, and call SET IE with all the IEs needed.
*
* The local IE cache will only be updated with the new IE if SET IE
* completed successfully.
*/
int uwb_rc_ie_add(struct uwb_rc *uwb_rc,
const struct uwb_ie_hdr *ies, size_t size)
{
int result = 0;
struct device *dev = &uwb_rc->uwb_dev.dev;
struct uwb_rc_cmd_set_ie *new_ies;
size_t ies_size, total_size, acc_size = 0;
if (uwb_rc->ies == NULL)
return -ESHUTDOWN;
uwb_ie_for_each(&uwb_rc->uwb_dev, __acc_size, &acc_size, ies, size);
if (acc_size != size) {
dev_err(dev, "BUG: bad IEs, misconstructed headers "
"[%zu bytes reported vs %zu calculated]\n",
size, acc_size);
WARN_ON(1);
return -EINVAL;
}
mutex_lock(&uwb_rc->ies_mutex);
ies_size = le16_to_cpu(uwb_rc->ies->wIELength);
total_size = sizeof(*uwb_rc->ies) + ies_size;
if (total_size + size > uwb_rc->ies_capacity) {
d_printf(4, dev, "Reallocating IE cache from %p capacity %zu "
"to capacity %zu\n", uwb_rc->ies, uwb_rc->ies_capacity,
total_size + size);
new_ies = kzalloc(total_size + size, GFP_KERNEL);
if (new_ies == NULL) {
dev_err(dev, "No memory for adding new IE\n");
result = -ENOMEM;
goto error_alloc;
}
memcpy(new_ies, uwb_rc->ies, total_size);
uwb_rc->ies_capacity = total_size + size;
kfree(uwb_rc->ies);
uwb_rc->ies = new_ies;
d_printf(4, dev, "New IE cache at %p capacity %zu\n",
uwb_rc->ies, uwb_rc->ies_capacity);
}
memcpy((void *)uwb_rc->ies + total_size, ies, size);
uwb_rc->ies->wIELength = cpu_to_le16(ies_size + size);
if (uwb_rc->beaconing != -1) {
result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
if (result < 0) {
dev_err(dev, "Cannot set new IE on device: %d\n",
result);
uwb_rc->ies->wIELength = cpu_to_le16(ies_size);
} else
result = 0;
}
d_printf(4, dev, "IEs now occupy %hu bytes of %zu capacity at %p\n",
le16_to_cpu(uwb_rc->ies->wIELength), uwb_rc->ies_capacity,
uwb_rc->ies);
error_alloc:
mutex_unlock(&uwb_rc->ies_mutex);
return result;
}
EXPORT_SYMBOL_GPL(uwb_rc_ie_add);
/*
* Remove an IE from internal cache
*
* We are dealing with our internal IE cache so no need to verify that the
* IEs are valid (it has been done already).
*
* Should be called with ies_mutex held
*
* We do not break out once an IE is found in the cache. It is currently
* possible to have more than one IE with the same ID included in the
* beacon. We don't reallocate, we just mark the size smaller.
*/
static
int uwb_rc_ie_cache_rm(struct uwb_rc *uwb_rc, enum uwb_ie to_remove)
{
struct uwb_ie_hdr *ie_hdr;
size_t new_len = le16_to_cpu(uwb_rc->ies->wIELength);
void *itr = uwb_rc->ies->IEData;
void *top = itr + new_len;
while (itr < top) {
ie_hdr = itr;
if (ie_hdr->element_id != to_remove) {
itr += sizeof(*ie_hdr) + ie_hdr->length;
} else {
int ie_length;
ie_length = sizeof(*ie_hdr) + ie_hdr->length;
if (top - itr != ie_length)
memmove(itr, itr + ie_length, top - itr + ie_length);
top -= ie_length;
new_len -= ie_length;
}
}
uwb_rc->ies->wIELength = cpu_to_le16(new_len);
return 0;
}
/**
* Remove an IE currently being transmitted by device
*
* @element_id: id of IE to be removed from device's beacon
*/
int uwb_rc_ie_rm(struct uwb_rc *uwb_rc, enum uwb_ie element_id)
{
struct device *dev = &uwb_rc->uwb_dev.dev;
int result;
if (uwb_rc->ies == NULL)
return -ESHUTDOWN;
mutex_lock(&uwb_rc->ies_mutex);
result = uwb_rc_ie_cache_rm(uwb_rc, element_id);
if (result < 0)
dev_err(dev, "Cannot remove IE from cache.\n");
if (uwb_rc->beaconing != -1) {
result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
if (result < 0)
dev_err(dev, "Cannot set new IE on device.\n");
}
mutex_unlock(&uwb_rc->ies_mutex);
return result;
}
EXPORT_SYMBOL_GPL(uwb_rc_ie_rm);
/**
* Create and set new Identification IE
*
* Currently only sets the Vendor ID. The Vendor ID is set from the OUI,
* which is obtained from the first three bytes from the MAC address.
*/
int uwb_rc_set_identification_ie(struct uwb_rc *uwb_rc)
{
struct {
struct uwb_identification_ie id_ie;
struct uwb_dev_info dev_info;
struct uwb_vendor_id vendor_id;
} ie_data;
ie_data.id_ie.hdr.element_id = UWB_IDENTIFICATION_IE;
ie_data.id_ie.hdr.length = sizeof(struct uwb_dev_info) +
sizeof(struct uwb_vendor_id);
ie_data.dev_info.type = UWB_DEV_INFO_VENDOR_ID;
ie_data.dev_info.length = sizeof(struct uwb_vendor_id);
ie_data.vendor_id.data[0] = uwb_rc->uwb_dev.mac_addr.data[0];
ie_data.vendor_id.data[1] = uwb_rc->uwb_dev.mac_addr.data[1];
ie_data.vendor_id.data[2] = uwb_rc->uwb_dev.mac_addr.data[2];
return uwb_rc_ie_add(uwb_rc, &ie_data.id_ie.hdr, sizeof(ie_data));
}

133
drivers/uwb/scan.c Normal file
View File

@ -0,0 +1,133 @@
/*
* Ultra Wide Band
* Scanning 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
* FIXME: there are issues here on how BEACON and SCAN on USB RCI deal
* with each other. Currently seems that START_BEACON while
* SCAN_ONLY will cancel the scan, so we need to update the
* state here. Clarification request sent by email on
* 10/05/2005.
* 10/28/2005 No clear answer heard--maybe we'll hack the API
* so that when we start beaconing, if the HC is
* scanning in a mode not compatible with beaconing
* we just fail.
*/
#include <linux/device.h>
#include <linux/err.h>
#include "uwb-internal.h"
/**
* Start/stop scanning in a radio controller
*
* @rc: UWB Radio Controlller
* @channel: Channel to scan; encodings in WUSB1.0[Table 5.12]
* @type: Type of scanning to do.
* @bpst_offset: value at which to start scanning (if type ==
* UWB_SCAN_ONLY_STARTTIME)
* @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_scan(struct uwb_rc *rc,
unsigned channel, enum uwb_scan_type type,
unsigned bpst_offset)
{
int result;
struct uwb_rc_cmd_scan *cmd;
struct uwb_rc_evt_confirm reply;
result = -ENOMEM;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (cmd == NULL)
goto error_kzalloc;
mutex_lock(&rc->uwb_dev.mutex);
cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SCAN);
cmd->bChannelNumber = channel;
cmd->bScanState = type;
cmd->wStartTime = cpu_to_le16(bpst_offset);
reply.rceb.bEventType = UWB_RC_CET_GENERAL;
reply.rceb.wEvent = UWB_RC_CMD_SCAN;
result = uwb_rc_cmd(rc, "SCAN", &cmd->rccb, sizeof(*cmd),
&reply.rceb, sizeof(reply));
if (result < 0)
goto error_cmd;
if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(&rc->uwb_dev.dev,
"SCAN: command execution failed: %s (%d)\n",
uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
result = -EIO;
goto error_cmd;
}
rc->scanning = channel;
rc->scan_type = type;
error_cmd:
mutex_unlock(&rc->uwb_dev.mutex);
kfree(cmd);
error_kzalloc:
return result;
}
/*
* Print scanning state
*/
static ssize_t uwb_rc_scan_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_rc *rc = uwb_dev->rc;
ssize_t result;
mutex_lock(&rc->uwb_dev.mutex);
result = sprintf(buf, "%d %d\n", rc->scanning, rc->scan_type);
mutex_unlock(&rc->uwb_dev.mutex);
return result;
}
/*
*
*/
static ssize_t uwb_rc_scan_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_rc *rc = uwb_dev->rc;
unsigned channel;
unsigned type;
unsigned bpst_offset = 0;
ssize_t result = -EINVAL;
result = sscanf(buf, "%u %u %u\n", &channel, &type, &bpst_offset);
if (result >= 2 && type < UWB_SCAN_TOP)
result = uwb_rc_scan(rc, channel, type, bpst_offset);
return result < 0 ? result : size;
}
/** Radio Control sysfs interface (declaration) */
DEVICE_ATTR(scan, S_IRUGO | S_IWUSR, uwb_rc_scan_show, uwb_rc_scan_store);