diff options
Diffstat (limited to 'drivers/uwb/radio.c')
| -rw-r--r-- | drivers/uwb/radio.c | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/drivers/uwb/radio.c b/drivers/uwb/radio.c deleted file mode 100644 index d58dfecf9a79..000000000000 --- a/drivers/uwb/radio.c +++ /dev/null @@ -1,203 +0,0 @@ -/* - * UWB radio (channel) management. - * - * Copyright (C) 2008 Cambridge Silicon Radio Ltd. - * - * 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, see <http://www.gnu.org/licenses/>. - */ -#include <linux/kernel.h> -#include <linux/uwb.h> -#include <linux/export.h> - -#include "uwb-internal.h" - - -static int uwb_radio_select_channel(struct uwb_rc *rc) -{ - /* - * Default to channel 9 (BG1, TFC1) unless the user has - * selected a specific channel or there are no active PALs. - */ - if (rc->active_pals == 0) - return -1; - if (rc->beaconing_forced) - return rc->beaconing_forced; - return 9; -} - - -/* - * Notify all active PALs that the channel has changed. - */ -static void uwb_radio_channel_changed(struct uwb_rc *rc, int channel) -{ - struct uwb_pal *pal; - - list_for_each_entry(pal, &rc->pals, node) { - if (pal->channel && channel != pal->channel) { - pal->channel = channel; - if (pal->channel_changed) - pal->channel_changed(pal, pal->channel); - } - } -} - -/* - * Change to a new channel and notify any active PALs of the new - * channel. - * - * When stopping the radio, PALs need to be notified first so they can - * terminate any active reservations. - */ -static int uwb_radio_change_channel(struct uwb_rc *rc, int channel) -{ - int ret = 0; - - if (channel == -1) - uwb_radio_channel_changed(rc, channel); - - if (channel != rc->beaconing) { - if (rc->beaconing != -1 && channel != -1) { - /* - * FIXME: should signal the channel change - * with a Channel Change IE. - */ - ret = uwb_radio_change_channel(rc, -1); - if (ret < 0) - return ret; - } - ret = uwb_rc_beacon(rc, channel, 0); - } - - if (channel != -1) - uwb_radio_channel_changed(rc, rc->beaconing); - - return ret; -} - -/** - * uwb_radio_start - request that the radio be started - * @pal: the PAL making the request. - * - * If the radio is not already active, aa suitable channel is selected - * and beacons are started. - */ -int uwb_radio_start(struct uwb_pal *pal) -{ - struct uwb_rc *rc = pal->rc; - int ret = 0; - - mutex_lock(&rc->uwb_dev.mutex); - - if (!pal->channel) { - pal->channel = -1; - rc->active_pals++; - ret = uwb_radio_change_channel(rc, uwb_radio_select_channel(rc)); - } - - mutex_unlock(&rc->uwb_dev.mutex); - return ret; -} -EXPORT_SYMBOL_GPL(uwb_radio_start); - -/** - * uwb_radio_stop - request tha the radio be stopped. - * @pal: the PAL making the request. - * - * Stops the radio if no other PAL is making use of it. - */ -void uwb_radio_stop(struct uwb_pal *pal) -{ - struct uwb_rc *rc = pal->rc; - - mutex_lock(&rc->uwb_dev.mutex); - - if (pal->channel) { - rc->active_pals--; - uwb_radio_change_channel(rc, uwb_radio_select_channel(rc)); - pal->channel = 0; - } - - mutex_unlock(&rc->uwb_dev.mutex); -} -EXPORT_SYMBOL_GPL(uwb_radio_stop); - -/* - * uwb_radio_force_channel - force a specific channel to be used - * @rc: the radio controller. - * @channel: the channel to use; -1 to force the radio to stop; 0 to - * use the default channel selection algorithm. - */ -int uwb_radio_force_channel(struct uwb_rc *rc, int channel) -{ - int ret = 0; - - mutex_lock(&rc->uwb_dev.mutex); - - rc->beaconing_forced = channel; - ret = uwb_radio_change_channel(rc, uwb_radio_select_channel(rc)); - - mutex_unlock(&rc->uwb_dev.mutex); - return ret; -} - -/* - * uwb_radio_setup - setup the radio manager - * @rc: the radio controller. - * - * The radio controller is reset to ensure it's in a known state - * before it's used. - */ -int uwb_radio_setup(struct uwb_rc *rc) -{ - return uwb_rc_reset(rc); -} - -/* - * uwb_radio_reset_state - reset any radio manager state - * @rc: the radio controller. - * - * All internal radio manager state is reset to values corresponding - * to a reset radio controller. - */ -void uwb_radio_reset_state(struct uwb_rc *rc) -{ - struct uwb_pal *pal; - - mutex_lock(&rc->uwb_dev.mutex); - - list_for_each_entry(pal, &rc->pals, node) { - if (pal->channel) { - pal->channel = -1; - if (pal->channel_changed) - pal->channel_changed(pal, -1); - } - } - - rc->beaconing = -1; - rc->scanning = -1; - - mutex_unlock(&rc->uwb_dev.mutex); -} - -/* - * uwb_radio_shutdown - shutdown the radio manager - * @rc: the radio controller. - * - * The radio controller is reset. - */ -void uwb_radio_shutdown(struct uwb_rc *rc) -{ - uwb_radio_reset_state(rc); - uwb_rc_reset(rc); -} |