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![Paul Gortmaker](/assets/img/avatar_default.png)
These macros are no longer in module.h and module.h is no longer present everywhere. Call out export.h for the real users who are making use of these macros, or else we'll get things like: CC drivers/uwb/umc-drv.o drivers/uwb/umc-dev.c:42: warning: data definition has no type or storage class drivers/uwb/umc-dev.c:42: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’ drivers/uwb/umc-dev.c:42: warning: parameter names (without types) in function declaration Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
203 lines
4.6 KiB
C
203 lines
4.6 KiB
C
/*
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* UWB radio (channel) management.
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*
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* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/uwb.h>
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#include <linux/export.h>
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#include "uwb-internal.h"
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static int uwb_radio_select_channel(struct uwb_rc *rc)
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{
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/*
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* Default to channel 9 (BG1, TFC1) unless the user has
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* selected a specific channel or there are no active PALs.
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*/
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if (rc->active_pals == 0)
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return -1;
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if (rc->beaconing_forced)
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return rc->beaconing_forced;
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return 9;
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}
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/*
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* Notify all active PALs that the channel has changed.
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*/
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static void uwb_radio_channel_changed(struct uwb_rc *rc, int channel)
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{
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struct uwb_pal *pal;
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list_for_each_entry(pal, &rc->pals, node) {
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if (pal->channel && channel != pal->channel) {
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pal->channel = channel;
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if (pal->channel_changed)
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pal->channel_changed(pal, pal->channel);
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}
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}
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}
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/*
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* Change to a new channel and notify any active PALs of the new
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* channel.
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*
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* When stopping the radio, PALs need to be notified first so they can
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* terminate any active reservations.
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*/
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static int uwb_radio_change_channel(struct uwb_rc *rc, int channel)
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{
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int ret = 0;
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if (channel == -1)
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uwb_radio_channel_changed(rc, channel);
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if (channel != rc->beaconing) {
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if (rc->beaconing != -1 && channel != -1) {
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/*
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* FIXME: should signal the channel change
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* with a Channel Change IE.
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*/
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ret = uwb_radio_change_channel(rc, -1);
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if (ret < 0)
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return ret;
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}
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ret = uwb_rc_beacon(rc, channel, 0);
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}
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if (channel != -1)
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uwb_radio_channel_changed(rc, rc->beaconing);
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return ret;
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}
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/**
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* uwb_radio_start - request that the radio be started
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* @pal: the PAL making the request.
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*
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* If the radio is not already active, aa suitable channel is selected
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* and beacons are started.
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*/
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int uwb_radio_start(struct uwb_pal *pal)
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{
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struct uwb_rc *rc = pal->rc;
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int ret = 0;
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mutex_lock(&rc->uwb_dev.mutex);
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if (!pal->channel) {
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pal->channel = -1;
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rc->active_pals++;
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ret = uwb_radio_change_channel(rc, uwb_radio_select_channel(rc));
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}
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mutex_unlock(&rc->uwb_dev.mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(uwb_radio_start);
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/**
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* uwb_radio_stop - request tha the radio be stopped.
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* @pal: the PAL making the request.
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*
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* Stops the radio if no other PAL is making use of it.
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*/
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void uwb_radio_stop(struct uwb_pal *pal)
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{
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struct uwb_rc *rc = pal->rc;
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mutex_lock(&rc->uwb_dev.mutex);
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if (pal->channel) {
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rc->active_pals--;
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uwb_radio_change_channel(rc, uwb_radio_select_channel(rc));
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pal->channel = 0;
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}
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mutex_unlock(&rc->uwb_dev.mutex);
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}
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EXPORT_SYMBOL_GPL(uwb_radio_stop);
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/*
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* uwb_radio_force_channel - force a specific channel to be used
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* @rc: the radio controller.
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* @channel: the channel to use; -1 to force the radio to stop; 0 to
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* use the default channel selection algorithm.
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*/
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int uwb_radio_force_channel(struct uwb_rc *rc, int channel)
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{
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int ret = 0;
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mutex_lock(&rc->uwb_dev.mutex);
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rc->beaconing_forced = channel;
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ret = uwb_radio_change_channel(rc, uwb_radio_select_channel(rc));
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mutex_unlock(&rc->uwb_dev.mutex);
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return ret;
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}
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/*
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* uwb_radio_setup - setup the radio manager
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* @rc: the radio controller.
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*
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* The radio controller is reset to ensure it's in a known state
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* before it's used.
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*/
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int uwb_radio_setup(struct uwb_rc *rc)
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{
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return uwb_rc_reset(rc);
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}
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/*
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* uwb_radio_reset_state - reset any radio manager state
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* @rc: the radio controller.
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*
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* All internal radio manager state is reset to values corresponding
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* to a reset radio controller.
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*/
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void uwb_radio_reset_state(struct uwb_rc *rc)
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{
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struct uwb_pal *pal;
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mutex_lock(&rc->uwb_dev.mutex);
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list_for_each_entry(pal, &rc->pals, node) {
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if (pal->channel) {
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pal->channel = -1;
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if (pal->channel_changed)
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pal->channel_changed(pal, -1);
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}
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}
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rc->beaconing = -1;
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rc->scanning = -1;
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mutex_unlock(&rc->uwb_dev.mutex);
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}
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/*
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* uwb_radio_shutdown - shutdown the radio manager
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* @rc: the radio controller.
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*
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* The radio controller is reset.
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*/
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void uwb_radio_shutdown(struct uwb_rc *rc)
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{
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uwb_radio_reset_state(rc);
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uwb_rc_reset(rc);
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}
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