/* * UWB PAL support. * * 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/debugfs.h> #include <linux/uwb.h> #include <linux/export.h> #include "uwb-internal.h" /** * uwb_pal_init - initialize a UWB PAL * @pal: the PAL to initialize */ void uwb_pal_init(struct uwb_pal *pal) { INIT_LIST_HEAD(&pal->node); } EXPORT_SYMBOL_GPL(uwb_pal_init); /** * uwb_pal_register - register a UWB PAL * @pal: the PAL * * The PAL must be initialized with uwb_pal_init(). */ int uwb_pal_register(struct uwb_pal *pal) { struct uwb_rc *rc = pal->rc; int ret; if (pal->device) { /* create a link to the uwb_rc in the PAL device's directory. */ ret = sysfs_create_link(&pal->device->kobj, &rc->uwb_dev.dev.kobj, "uwb_rc"); if (ret < 0) return ret; /* create a link to the PAL in the UWB device's directory. */ ret = sysfs_create_link(&rc->uwb_dev.dev.kobj, &pal->device->kobj, pal->name); if (ret < 0) { sysfs_remove_link(&pal->device->kobj, "uwb_rc"); return ret; } } pal->debugfs_dir = uwb_dbg_create_pal_dir(pal); mutex_lock(&rc->uwb_dev.mutex); list_add(&pal->node, &rc->pals); mutex_unlock(&rc->uwb_dev.mutex); return 0; } EXPORT_SYMBOL_GPL(uwb_pal_register); static int find_rc(struct device *dev, const void *data) { const struct uwb_rc *target_rc = data; struct uwb_rc *rc = dev_get_drvdata(dev); if (rc == NULL) { WARN_ON(1); return 0; } if (rc == target_rc) { if (rc->ready == 0) return 0; else return 1; } return 0; } /** * Given a radio controller descriptor see if it is registered. * * @returns false if the rc does not exist or is quiescing; true otherwise. */ static bool uwb_rc_class_device_exists(struct uwb_rc *target_rc) { struct device *dev; dev = class_find_device(&uwb_rc_class, NULL, target_rc, find_rc); put_device(dev); return (dev != NULL); } /** * uwb_pal_unregister - unregister a UWB PAL * @pal: the PAL */ void uwb_pal_unregister(struct uwb_pal *pal) { struct uwb_rc *rc = pal->rc; uwb_radio_stop(pal); mutex_lock(&rc->uwb_dev.mutex); list_del(&pal->node); mutex_unlock(&rc->uwb_dev.mutex); debugfs_remove(pal->debugfs_dir); if (pal->device) { /* remove link to the PAL in the UWB device's directory. */ if (uwb_rc_class_device_exists(rc)) sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name); /* remove link to uwb_rc in the PAL device's directory. */ sysfs_remove_link(&pal->device->kobj, "uwb_rc"); } } EXPORT_SYMBOL_GPL(uwb_pal_unregister); /** * uwb_rc_pal_init - initialize the PAL related parts of a radio controller * @rc: the radio controller */ void uwb_rc_pal_init(struct uwb_rc *rc) { INIT_LIST_HEAD(&rc->pals); }