[mirror_ubuntu-eoan-kernel.git] / drivers / uwb / lc-dev.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Ultra Wide Band
 * Life cycle of devices
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * FIXME: docs
 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/kdev_t.h>
#include <linux/random.h>
#include <linux/stat.h>
#include "uwb-internal.h"

/* We initialize addresses to 0xff (invalid, as it is bcast) */
static inline void uwb_dev_addr_init(struct uwb_dev_addr *addr)
{
	memset(&addr->data, 0xff, sizeof(addr->data));
}

static inline void uwb_mac_addr_init(struct uwb_mac_addr *addr)
{
	memset(&addr->data, 0xff, sizeof(addr->data));
}

/*
 * Add callback @new to be called when an event occurs in @rc.
 */
int uwb_notifs_register(struct uwb_rc *rc, struct uwb_notifs_handler *new)
{
	if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
		return -ERESTARTSYS;
	list_add(&new->list_node, &rc->notifs_chain.list);
	mutex_unlock(&rc->notifs_chain.mutex);
	return 0;
}
EXPORT_SYMBOL_GPL(uwb_notifs_register);

/*
 * Remove event handler (callback)
 */
int uwb_notifs_deregister(struct uwb_rc *rc, struct uwb_notifs_handler *entry)
{
	if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
		return -ERESTARTSYS;
	list_del(&entry->list_node);
	mutex_unlock(&rc->notifs_chain.mutex);
	return 0;
}
EXPORT_SYMBOL_GPL(uwb_notifs_deregister);

/*
 * Notify all event handlers of a given event on @rc
 *
 * We are called with a valid reference to the device, or NULL if the
 * event is not for a particular event (e.g., a BG join event).
 */
void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event)
{
	struct uwb_notifs_handler *handler;
	if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
		return;
	if (!list_empty(&rc->notifs_chain.list)) {
		list_for_each_entry(handler, &rc->notifs_chain.list, list_node) {
			handler->cb(handler->data, uwb_dev, event);
		}
	}
	mutex_unlock(&rc->notifs_chain.mutex);
}

/*
 * Release the backing device of a uwb_dev that has been dynamically allocated.
 */
static void uwb_dev_sys_release(struct device *dev)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);

	uwb_bce_put(uwb_dev->bce);
	memset(uwb_dev, 0x69, sizeof(*uwb_dev));
	kfree(uwb_dev);
}

/*
 * Initialize a UWB device instance
 *
 * Alloc, zero and call this function.
 */
void uwb_dev_init(struct uwb_dev *uwb_dev)
{
	mutex_init(&uwb_dev->mutex);
	device_initialize(&uwb_dev->dev);
	uwb_dev->dev.release = uwb_dev_sys_release;
	uwb_dev_addr_init(&uwb_dev->dev_addr);
	uwb_mac_addr_init(&uwb_dev->mac_addr);
	bitmap_fill(uwb_dev->streams, UWB_NUM_GLOBAL_STREAMS);
}

static ssize_t uwb_dev_EUI_48_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	char addr[UWB_ADDR_STRSIZE];

	uwb_mac_addr_print(addr, sizeof(addr), &uwb_dev->mac_addr);
	return sprintf(buf, "%s\n", addr);
}
static DEVICE_ATTR(EUI_48, S_IRUGO, uwb_dev_EUI_48_show, NULL);

static ssize_t uwb_dev_DevAddr_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	char addr[UWB_ADDR_STRSIZE];

	uwb_dev_addr_print(addr, sizeof(addr), &uwb_dev->dev_addr);
	return sprintf(buf, "%s\n", addr);
}
static DEVICE_ATTR(DevAddr, S_IRUGO, uwb_dev_DevAddr_show, NULL);

/*
 * Show the BPST of this device.
 *
 * Calculated from the receive time of the device's beacon and it's
 * slot number.
 */
static ssize_t uwb_dev_BPST_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_beca_e *bce;
	struct uwb_beacon_frame *bf;
	u16 bpst;

	bce = uwb_dev->bce;
	mutex_lock(&bce->mutex);
	bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo;
	bpst = bce->be->wBPSTOffset
		- (u16)(bf->Beacon_Slot_Number * UWB_BEACON_SLOT_LENGTH_US);
	mutex_unlock(&bce->mutex);

	return sprintf(buf, "%d\n", bpst);
}
static DEVICE_ATTR(BPST, S_IRUGO, uwb_dev_BPST_show, NULL);

/*
 * Show the IEs a device is beaconing
 *
 * We need to access the beacon cache, so we just lock it really
 * quick, print the IEs and unlock.
 *
 * We have a reference on the cache entry, so that should be
 * quite safe.
 */
static ssize_t uwb_dev_IEs_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);

	return uwb_bce_print_IEs(uwb_dev, uwb_dev->bce, buf, PAGE_SIZE);
}
static DEVICE_ATTR(IEs, S_IRUGO | S_IWUSR, uwb_dev_IEs_show, NULL);

static ssize_t uwb_dev_LQE_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_beca_e *bce = uwb_dev->bce;
	size_t result;

	mutex_lock(&bce->mutex);
	result = stats_show(&uwb_dev->bce->lqe_stats, buf);
	mutex_unlock(&bce->mutex);
	return result;
}

static ssize_t uwb_dev_LQE_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_beca_e *bce = uwb_dev->bce;
	ssize_t result;

	mutex_lock(&bce->mutex);
	result = stats_store(&uwb_dev->bce->lqe_stats, buf, size);
	mutex_unlock(&bce->mutex);
	return result;
}
static DEVICE_ATTR(LQE, S_IRUGO | S_IWUSR, uwb_dev_LQE_show, uwb_dev_LQE_store);

static ssize_t uwb_dev_RSSI_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_beca_e *bce = uwb_dev->bce;
	size_t result;

	mutex_lock(&bce->mutex);
	result = stats_show(&uwb_dev->bce->rssi_stats, buf);
	mutex_unlock(&bce->mutex);
	return result;
}

static ssize_t uwb_dev_RSSI_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_beca_e *bce = uwb_dev->bce;
	ssize_t result;

	mutex_lock(&bce->mutex);
	result = stats_store(&uwb_dev->bce->rssi_stats, buf, size);
	mutex_unlock(&bce->mutex);
	return result;
}
static DEVICE_ATTR(RSSI, S_IRUGO | S_IWUSR, uwb_dev_RSSI_show, uwb_dev_RSSI_store);


static struct attribute *uwb_dev_attrs[] = {
	&dev_attr_EUI_48.attr,
	&dev_attr_DevAddr.attr,
	&dev_attr_BPST.attr,
	&dev_attr_IEs.attr,
	&dev_attr_LQE.attr,
	&dev_attr_RSSI.attr,
	NULL,
};
ATTRIBUTE_GROUPS(uwb_dev);

/* UWB bus type. */
struct bus_type uwb_bus_type = {
	.name =		"uwb",
	.dev_groups =	uwb_dev_groups,
};

/**
 * Device SYSFS registration
 */
static int __uwb_dev_sys_add(struct uwb_dev *uwb_dev, struct device *parent_dev)
{
	struct device *dev;

	dev = &uwb_dev->dev;
	dev->parent = parent_dev;
	dev_set_drvdata(dev, uwb_dev);

	return device_add(dev);
}


static void __uwb_dev_sys_rm(struct uwb_dev *uwb_dev)
{
	dev_set_drvdata(&uwb_dev->dev, NULL);
	device_del(&uwb_dev->dev);
}


/**
 * Register and initialize a new UWB device
 *
 * Did you call uwb_dev_init() on it?
 *
 * @parent_rc: is the parent radio controller who has the link to the
 *             device. When registering the UWB device that is a UWB
 *             Radio Controller, we point back to it.
 *
 * If registering the device that is part of a radio, caller has set
 * rc->uwb_dev->dev. Otherwise it is to be left NULL--a new one will
 * be allocated.
 */
int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev,
		struct uwb_rc *parent_rc)
{
	int result;
	struct device *dev;

	BUG_ON(uwb_dev == NULL);
	BUG_ON(parent_dev == NULL);
	BUG_ON(parent_rc == NULL);

	mutex_lock(&uwb_dev->mutex);
	dev = &uwb_dev->dev;
	uwb_dev->rc = parent_rc;
	result = __uwb_dev_sys_add(uwb_dev, parent_dev);
	if (result < 0)
		printk(KERN_ERR "UWB: unable to register dev %s with sysfs: %d\n",
		       dev_name(dev), result);
	mutex_unlock(&uwb_dev->mutex);
	return result;
}


void uwb_dev_rm(struct uwb_dev *uwb_dev)
{
	mutex_lock(&uwb_dev->mutex);
	__uwb_dev_sys_rm(uwb_dev);
	mutex_unlock(&uwb_dev->mutex);
}


static
int __uwb_dev_try_get(struct device *dev, void *__target_uwb_dev)
{
	struct uwb_dev *target_uwb_dev = __target_uwb_dev;
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	if (uwb_dev == target_uwb_dev) {
		uwb_dev_get(uwb_dev);
		return 1;
	} else
		return 0;
}


/**
 * Given a UWB device descriptor, validate and refcount it
 *
 * @returns NULL if the device does not exist or is quiescing; the ptr to
 *               it otherwise.
 */
struct uwb_dev *uwb_dev_try_get(struct uwb_rc *rc, struct uwb_dev *uwb_dev)
{
	if (uwb_dev_for_each(rc, __uwb_dev_try_get, uwb_dev))
		return uwb_dev;
	else
		return NULL;
}
EXPORT_SYMBOL_GPL(uwb_dev_try_get);


/**
 * Remove a device from the system [grunt for other functions]
 */
int __uwb_dev_offair(struct uwb_dev *uwb_dev, struct uwb_rc *rc)
{
	struct device *dev = &uwb_dev->dev;
	char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];

	uwb_mac_addr_print(macbuf, sizeof(macbuf), &uwb_dev->mac_addr);
	uwb_dev_addr_print(devbuf, sizeof(devbuf), &uwb_dev->dev_addr);
	dev_info(dev, "uwb device (mac %s dev %s) disconnected from %s %s\n",
		 macbuf, devbuf,
		 uwb_dev->dev.bus->name,
		 rc ? dev_name(&(rc->uwb_dev.dev)) : "");
	uwb_dev_rm(uwb_dev);
	list_del(&uwb_dev->bce->node);
	uwb_bce_put(uwb_dev->bce);
	uwb_dev_put(uwb_dev);	/* for the creation in _onair() */

	return 0;
}


/**
 * A device went off the air, clean up after it!
 *
 * This is called by the UWB Daemon (through the beacon purge function
 * uwb_bcn_cache_purge) when it is detected that a device has been in
 * radio silence for a while.
 *
 * If this device is actually a local radio controller we don't need
 * to go through the offair process, as it is not registered as that.
 *
 * NOTE: uwb_bcn_cache.mutex is held!
 */
void uwbd_dev_offair(struct uwb_beca_e *bce)
{
	struct uwb_dev *uwb_dev;

	uwb_dev = bce->uwb_dev;
	if (uwb_dev) {
		uwb_notify(uwb_dev->rc, uwb_dev, UWB_NOTIF_OFFAIR);
		__uwb_dev_offair(uwb_dev, uwb_dev->rc);
	}
}


/**
 * A device went on the air, start it up!
 *
 * This is called by the UWB Daemon when it is detected that a device
 * has popped up in the radio range of the radio controller.
 *
 * It will just create the freaking device, register the beacon and
 * stuff and yatla, done.
 *
 *
 * NOTE: uwb_beca.mutex is held, bce->mutex is held
 */
void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce)
{
	int result;
	struct device *dev = &rc->uwb_dev.dev;
	struct uwb_dev *uwb_dev;
	char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];

	uwb_mac_addr_print(macbuf, sizeof(macbuf), bce->mac_addr);
	uwb_dev_addr_print(devbuf, sizeof(devbuf), &bce->dev_addr);
	uwb_dev = kzalloc(sizeof(struct uwb_dev), GFP_KERNEL);
	if (uwb_dev == NULL) {
		dev_err(dev, "new device %s: Cannot allocate memory\n",
			macbuf);
		return;
	}
	uwb_dev_init(uwb_dev);		/* This sets refcnt to one, we own it */
	uwb_dev->dev.bus = &uwb_bus_type;
	uwb_dev->mac_addr = *bce->mac_addr;
	uwb_dev->dev_addr = bce->dev_addr;
	dev_set_name(&uwb_dev->dev, "%s", macbuf);

	/* plug the beacon cache */
	bce->uwb_dev = uwb_dev;
	uwb_dev->bce = bce;
	uwb_bce_get(bce);		/* released in uwb_dev_sys_release() */

	result = uwb_dev_add(uwb_dev, &rc->uwb_dev.dev, rc);
	if (result < 0) {
		dev_err(dev, "new device %s: cannot instantiate device\n",
			macbuf);
		goto error_dev_add;
	}

	dev_info(dev, "uwb device (mac %s dev %s) connected to %s %s\n",
		 macbuf, devbuf, uwb_dev->dev.bus->name,
		 dev_name(&(rc->uwb_dev.dev)));
	uwb_notify(rc, uwb_dev, UWB_NOTIF_ONAIR);
	return;

error_dev_add:
	bce->uwb_dev = NULL;
	uwb_bce_put(bce);
	kfree(uwb_dev);
	return;
}

/**
 * Iterate over the list of UWB devices, calling a @function on each
 *
 * See docs for bus_for_each()....
 *
 * @rc:       radio controller for the devices.
 * @function: function to call.
 * @priv:     data to pass to @function.
 * @returns:  0 if no invocation of function() returned a value
 *            different to zero. That value otherwise.
 */
int uwb_dev_for_each(struct uwb_rc *rc, uwb_dev_for_each_f function, void *priv)
{
	return device_for_each_child(&rc->uwb_dev.dev, priv, function);
}
EXPORT_SYMBOL_GPL(uwb_dev_for_each);
Commit	Line	Data
04672fe6	1	// SPDX-License-Identifier: GPL-2.0-only
183b9b59 IPG	2	/*
	3	* Ultra Wide Band
	4	* Life cycle of devices
	5	*
	6	* Copyright (C) 2005-2006 Intel Corporation
	7	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	8	*
183b9b59 IPG	9	* FIXME: docs
183b9b59 IPG	10	*/
183b9b59	11	#include <linux/kernel.h>
5a0e3ad6	12	#include <linux/slab.h>
183b9b59	13	#include <linux/device.h>
475c0a6b	14	#include <linux/export.h>
183b9b59 IPG	15	#include <linux/err.h>
	16	#include <linux/kdev_t.h>
	17	#include <linux/random.h>
0b992080	18	#include <linux/stat.h>
183b9b59 IPG	19	#include "uwb-internal.h"
183b9b59 IPG	20
183b9b59 IPG	21	/* We initialize addresses to 0xff (invalid, as it is bcast) */
	22	static inline void uwb_dev_addr_init(struct uwb_dev_addr *addr)
	23	{
	24	memset(&addr->data, 0xff, sizeof(addr->data));
	25	}
	26
	27	static inline void uwb_mac_addr_init(struct uwb_mac_addr *addr)
	28	{
	29	memset(&addr->data, 0xff, sizeof(addr->data));
	30	}
	31
183b9b59 IPG	32	/*
	33	* Add callback @new to be called when an event occurs in @rc.
	34	*/
	35	int uwb_notifs_register(struct uwb_rc rc, struct uwb_notifs_handler new)
	36	{
	37	if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
	38	return -ERESTARTSYS;
	39	list_add(&new->list_node, &rc->notifs_chain.list);
	40	mutex_unlock(&rc->notifs_chain.mutex);
	41	return 0;
	42	}
	43	EXPORT_SYMBOL_GPL(uwb_notifs_register);
	44
	45	/*
	46	* Remove event handler (callback)
	47	*/
	48	int uwb_notifs_deregister(struct uwb_rc rc, struct uwb_notifs_handler entry)
	49	{
	50	if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
	51	return -ERESTARTSYS;
	52	list_del(&entry->list_node);
	53	mutex_unlock(&rc->notifs_chain.mutex);
	54	return 0;
	55	}
	56	EXPORT_SYMBOL_GPL(uwb_notifs_deregister);
	57
	58	/*
	59	* Notify all event handlers of a given event on @rc
	60	*
	61	* We are called with a valid reference to the device, or NULL if the
	62	* event is not for a particular event (e.g., a BG join event).
	63	*/
	64	void uwb_notify(struct uwb_rc rc, struct uwb_dev uwb_dev, enum uwb_notifs event)
	65	{
	66	struct uwb_notifs_handler *handler;
	67	if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
	68	return;
	69	if (!list_empty(&rc->notifs_chain.list)) {
	70	list_for_each_entry(handler, &rc->notifs_chain.list, list_node) {
	71	handler->cb(handler->data, uwb_dev, event);
	72	}
	73	}
	74	mutex_unlock(&rc->notifs_chain.mutex);
	75	}
	76
	77	/*
	78	* Release the backing device of a uwb_dev that has been dynamically allocated.
	79	*/
	80	static void uwb_dev_sys_release(struct device *dev)
	81	{
	82	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	83
183b9b59	84	uwb_bce_put(uwb_dev->bce);
183b9b59 IPG	85	memset(uwb_dev, 0x69, sizeof(*uwb_dev));
183b9b59 IPG	86	kfree(uwb_dev);
183b9b59 IPG	87	}
	88
	89	/*
	90	* Initialize a UWB device instance
	91	*
	92	* Alloc, zero and call this function.
	93	*/
	94	void uwb_dev_init(struct uwb_dev *uwb_dev)
	95	{
	96	mutex_init(&uwb_dev->mutex);
	97	device_initialize(&uwb_dev->dev);
	98	uwb_dev->dev.release = uwb_dev_sys_release;
	99	uwb_dev_addr_init(&uwb_dev->dev_addr);
	100	uwb_mac_addr_init(&uwb_dev->mac_addr);
	101	bitmap_fill(uwb_dev->streams, UWB_NUM_GLOBAL_STREAMS);
	102	}
	103
	104	static ssize_t uwb_dev_EUI_48_show(struct device *dev,
	105	struct device_attribute attr, char buf)
	106	{
	107	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	108	char addr[UWB_ADDR_STRSIZE];
	109
	110	uwb_mac_addr_print(addr, sizeof(addr), &uwb_dev->mac_addr);
	111	return sprintf(buf, "%s\n", addr);
	112	}
	113	static DEVICE_ATTR(EUI_48, S_IRUGO, uwb_dev_EUI_48_show, NULL);
	114
	115	static ssize_t uwb_dev_DevAddr_show(struct device *dev,
	116	struct device_attribute attr, char buf)
	117	{
	118	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	119	char addr[UWB_ADDR_STRSIZE];
	120
	121	uwb_dev_addr_print(addr, sizeof(addr), &uwb_dev->dev_addr);
	122	return sprintf(buf, "%s\n", addr);
	123	}
	124	static DEVICE_ATTR(DevAddr, S_IRUGO, uwb_dev_DevAddr_show, NULL);
	125
	126	/*
	127	* Show the BPST of this device.
	128	*
	129	* Calculated from the receive time of the device's beacon and it's
	130	* slot number.
	131	*/
	132	static ssize_t uwb_dev_BPST_show(struct device *dev,
	133	struct device_attribute attr, char buf)
	134	{
	135	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	136	struct uwb_beca_e *bce;
	137	struct uwb_beacon_frame *bf;
	138	u16 bpst;
	139
	140	bce = uwb_dev->bce;
	141	mutex_lock(&bce->mutex);
	142	bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo;
	143	bpst = bce->be->wBPSTOffset
	144	- (u16)(bf->Beacon_Slot_Number * UWB_BEACON_SLOT_LENGTH_US);
	145	mutex_unlock(&bce->mutex);
	146
	147	return sprintf(buf, "%d\n", bpst);
	148	}
	149	static DEVICE_ATTR(BPST, S_IRUGO, uwb_dev_BPST_show, NULL);
	150
151	/*
152	* Show the IEs a device is beaconing
153	*
154	* We need to access the beacon cache, so we just lock it really
155	* quick, print the IEs and unlock.
156	*
157	* We have a reference on the cache entry, so that should be
158	* quite safe.
159	*/
160	static ssize_t uwb_dev_IEs_show(struct device *dev,
161	struct device_attribute attr, char buf)
162	{
163	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
164
165	return uwb_bce_print_IEs(uwb_dev, uwb_dev->bce, buf, PAGE_SIZE);
166	}
167	static DEVICE_ATTR(IEs, S_IRUGO \| S_IWUSR, uwb_dev_IEs_show, NULL);
168
169	static ssize_t uwb_dev_LQE_show(struct device *dev,
170	struct device_attribute attr, char buf)
171	{
172	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
173	struct uwb_beca_e *bce = uwb_dev->bce;
174	size_t result;
175
176	mutex_lock(&bce->mutex);
177	result = stats_show(&uwb_dev->bce->lqe_stats, buf);
178	mutex_unlock(&bce->mutex);
179	return result;
180	}
181
182	static ssize_t uwb_dev_LQE_store(struct device *dev,
183	struct device_attribute *attr,
184	const char *buf, size_t size)
185	{
186	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
187	struct uwb_beca_e *bce = uwb_dev->bce;
188	ssize_t result;
189
190	mutex_lock(&bce->mutex);
191	result = stats_store(&uwb_dev->bce->lqe_stats, buf, size);
192	mutex_unlock(&bce->mutex);
193	return result;
194	}
195	static DEVICE_ATTR(LQE, S_IRUGO \| S_IWUSR, uwb_dev_LQE_show, uwb_dev_LQE_store);
196
197	static ssize_t uwb_dev_RSSI_show(struct device *dev,
198	struct device_attribute attr, char buf)
199	{
200	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
201	struct uwb_beca_e *bce = uwb_dev->bce;
202	size_t result;
203
204	mutex_lock(&bce->mutex);
205	result = stats_show(&uwb_dev->bce->rssi_stats, buf);
206	mutex_unlock(&bce->mutex);
207	return result;
208	}
209
210	static ssize_t uwb_dev_RSSI_store(struct device *dev,
211	struct device_attribute *attr,
212	const char *buf, size_t size)
213	{
214	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
215	struct uwb_beca_e *bce = uwb_dev->bce;
216	ssize_t result;
217
218	mutex_lock(&bce->mutex);
219	result = stats_store(&uwb_dev->bce->rssi_stats, buf, size);
220	mutex_unlock(&bce->mutex);
221	return result;
222	}
223	static DEVICE_ATTR(RSSI, S_IRUGO \| S_IWUSR, uwb_dev_RSSI_show, uwb_dev_RSSI_store);
224
225
2fc74ac2	226	static struct attribute *uwb_dev_attrs[] = {
183b9b59 IPG	227	&dev_attr_EUI_48.attr,
	228	&dev_attr_DevAddr.attr,
	229	&dev_attr_BPST.attr,
	230	&dev_attr_IEs.attr,
	231	&dev_attr_LQE.attr,
	232	&dev_attr_RSSI.attr,
	233	NULL,
	234	};
2fc74ac2	235	ATTRIBUTE_GROUPS(uwb_dev);
183b9b59	236
84887934 TP	237	/* UWB bus type. */
	238	struct bus_type uwb_bus_type = {
	239	.name = "uwb",
	240	.dev_groups = uwb_dev_groups,
	241	};
	242
183b9b59 IPG	243	/**
183b9b59 IPG	244	* Device SYSFS registration
183b9b59 IPG	245	*/
	246	static int __uwb_dev_sys_add(struct uwb_dev uwb_dev, struct device parent_dev)
	247	{
183b9b59 IPG	248	struct device *dev;
183b9b59 IPG	249
183b9b59	250	dev = &uwb_dev->dev;
183b9b59 IPG	251	dev->parent = parent_dev;
	252	dev_set_drvdata(dev, uwb_dev);
	253
bce83697	254	return device_add(dev);
183b9b59 IPG	255	}
	256
	257
	258	static void __uwb_dev_sys_rm(struct uwb_dev *uwb_dev)
	259	{
183b9b59 IPG	260	dev_set_drvdata(&uwb_dev->dev, NULL);
183b9b59 IPG	261	device_del(&uwb_dev->dev);
183b9b59 IPG	262	}
	263
	264
	265	/**
	266	* Register and initialize a new UWB device
	267	*
	268	* Did you call uwb_dev_init() on it?
	269	*
	270	* @parent_rc: is the parent radio controller who has the link to the
	271	* device. When registering the UWB device that is a UWB
	272	* Radio Controller, we point back to it.
	273	*
	274	* If registering the device that is part of a radio, caller has set
	275	* rc->uwb_dev->dev. Otherwise it is to be left NULL--a new one will
	276	* be allocated.
	277	*/
	278	int uwb_dev_add(struct uwb_dev uwb_dev, struct device parent_dev,
	279	struct uwb_rc *parent_rc)
	280	{
	281	int result;
	282	struct device *dev;
	283
	284	BUG_ON(uwb_dev == NULL);
	285	BUG_ON(parent_dev == NULL);
	286	BUG_ON(parent_rc == NULL);
	287
	288	mutex_lock(&uwb_dev->mutex);
	289	dev = &uwb_dev->dev;
	290	uwb_dev->rc = parent_rc;
	291	result = __uwb_dev_sys_add(uwb_dev, parent_dev);
	292	if (result < 0)
	293	printk(KERN_ERR "UWB: unable to register dev %s with sysfs: %d\n",
	294	dev_name(dev), result);
	295	mutex_unlock(&uwb_dev->mutex);
	296	return result;
	297	}
	298
	299
	300	void uwb_dev_rm(struct uwb_dev *uwb_dev)
	301	{
	302	mutex_lock(&uwb_dev->mutex);
	303	__uwb_dev_sys_rm(uwb_dev);
	304	mutex_unlock(&uwb_dev->mutex);
	305	}
	306
	307
	308	static
	309	int __uwb_dev_try_get(struct device dev, void __target_uwb_dev)
	310	{
	311	struct uwb_dev *target_uwb_dev = __target_uwb_dev;
	312	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	313	if (uwb_dev == target_uwb_dev) {
	314	uwb_dev_get(uwb_dev);
	315	return 1;
	316	} else
	317	return 0;
	318	}
	319
	320
	321	/**
	322	* Given a UWB device descriptor, validate and refcount it
	323	*
	324	* @returns NULL if the device does not exist or is quiescing; the ptr to
	325	* it otherwise.
326	*/
327	struct uwb_dev uwb_dev_try_get(struct uwb_rc rc, struct uwb_dev *uwb_dev)
328	{
329	if (uwb_dev_for_each(rc, __uwb_dev_try_get, uwb_dev))
330	return uwb_dev;
331	else
332	return NULL;
333	}
334	EXPORT_SYMBOL_GPL(uwb_dev_try_get);
335
336
337	/**
338	* Remove a device from the system [grunt for other functions]
339	*/
340	int __uwb_dev_offair(struct uwb_dev uwb_dev, struct uwb_rc rc)
341	{
342	struct device *dev = &uwb_dev->dev;
343	char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];
344
183b9b59 IPG	345	uwb_mac_addr_print(macbuf, sizeof(macbuf), &uwb_dev->mac_addr);
	346	uwb_dev_addr_print(devbuf, sizeof(devbuf), &uwb_dev->dev_addr);
	347	dev_info(dev, "uwb device (mac %s dev %s) disconnected from %s %s\n",
	348	macbuf, devbuf,
e53582bb TP	349	uwb_dev->dev.bus->name,
e53582bb TP	350	rc ? dev_name(&(rc->uwb_dev.dev)) : "");
183b9b59	351	uwb_dev_rm(uwb_dev);
3af37302 SP	352	list_del(&uwb_dev->bce->node);
3af37302 SP	353	uwb_bce_put(uwb_dev->bce);
183b9b59	354	uwb_dev_put(uwb_dev); /* for the creation in _onair() */
bce83697	355
183b9b59 IPG	356	return 0;
	357	}
	358
	359
	360	/**
	361	* A device went off the air, clean up after it!
	362	*
	363	* This is called by the UWB Daemon (through the beacon purge function
	364	* uwb_bcn_cache_purge) when it is detected that a device has been in
	365	* radio silence for a while.
	366	*
	367	* If this device is actually a local radio controller we don't need
	368	* to go through the offair process, as it is not registered as that.
	369	*
	370	* NOTE: uwb_bcn_cache.mutex is held!
	371	*/
	372	void uwbd_dev_offair(struct uwb_beca_e *bce)
	373	{
	374	struct uwb_dev *uwb_dev;
	375
	376	uwb_dev = bce->uwb_dev;
	377	if (uwb_dev) {
	378	uwb_notify(uwb_dev->rc, uwb_dev, UWB_NOTIF_OFFAIR);
	379	__uwb_dev_offair(uwb_dev, uwb_dev->rc);
	380	}
	381	}
	382
	383
	384	/**
	385	* A device went on the air, start it up!
	386	*
	387	* This is called by the UWB Daemon when it is detected that a device
	388	* has popped up in the radio range of the radio controller.
	389	*
	390	* It will just create the freaking device, register the beacon and
	391	* stuff and yatla, done.
	392	*
	393	*
	394	* NOTE: uwb_beca.mutex is held, bce->mutex is held
	395	*/
	396	void uwbd_dev_onair(struct uwb_rc rc, struct uwb_beca_e bce)
	397	{
	398	int result;
	399	struct device *dev = &rc->uwb_dev.dev;
	400	struct uwb_dev *uwb_dev;
	401	char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];
	402
	403	uwb_mac_addr_print(macbuf, sizeof(macbuf), bce->mac_addr);
	404	uwb_dev_addr_print(devbuf, sizeof(devbuf), &bce->dev_addr);
92c4d9bd	405	uwb_dev = kzalloc(sizeof(struct uwb_dev), GFP_KERNEL);
183b9b59 IPG	406	if (uwb_dev == NULL) {
	407	dev_err(dev, "new device %s: Cannot allocate memory\n",
	408	macbuf);
	409	return;
	410	}
	411	uwb_dev_init(uwb_dev); /* This sets refcnt to one, we own it */
84887934	412	uwb_dev->dev.bus = &uwb_bus_type;
183b9b59 IPG	413	uwb_dev->mac_addr = *bce->mac_addr;
183b9b59 IPG	414	uwb_dev->dev_addr = bce->dev_addr;
02aa2a37	415	dev_set_name(&uwb_dev->dev, "%s", macbuf);
675f0ab2 TP	416
	417	/* plug the beacon cache */
	418	bce->uwb_dev = uwb_dev;
	419	uwb_dev->bce = bce;
	420	uwb_bce_get(bce); /* released in uwb_dev_sys_release() */
	421
183b9b59 IPG	422	result = uwb_dev_add(uwb_dev, &rc->uwb_dev.dev, rc);
	423	if (result < 0) {
	424	dev_err(dev, "new device %s: cannot instantiate device\n",
	425	macbuf);
	426	goto error_dev_add;
	427	}
675f0ab2	428
183b9b59	429	dev_info(dev, "uwb device (mac %s dev %s) connected to %s %s\n",
e53582bb TP	430	macbuf, devbuf, uwb_dev->dev.bus->name,
e53582bb TP	431	dev_name(&(rc->uwb_dev.dev)));
183b9b59 IPG	432	uwb_notify(rc, uwb_dev, UWB_NOTIF_ONAIR);
	433	return;
	434
	435	error_dev_add:
675f0ab2 TP	436	bce->uwb_dev = NULL;
675f0ab2 TP	437	uwb_bce_put(bce);
183b9b59 IPG	438	kfree(uwb_dev);
	439	return;
	440	}
	441
	442	/**
	443	* Iterate over the list of UWB devices, calling a @function on each
	444	*
	445	* See docs for bus_for_each()....
	446	*
	447	* @rc: radio controller for the devices.
	448	* @function: function to call.
	449	* @priv: data to pass to @function.
	450	* @returns: 0 if no invocation of function() returned a value
	451	* different to zero. That value otherwise.
	452	*/
	453	int uwb_dev_for_each(struct uwb_rc rc, uwb_dev_for_each_f function, void priv)
	454	{
	455	return device_for_each_child(&rc->uwb_dev.dev, priv, function);
	456	}
	457	EXPORT_SYMBOL_GPL(uwb_dev_for_each);