[deliverable/linux.git] / drivers / net / ieee802154 / fakelb.c

/*
 * Loopback IEEE 802.15.4 interface
 *
 * Copyright 2007-2012 Siemens AG
 *
 * 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.
 *
 * Written by:
 * Sergey Lapin <slapin@ossfans.org>
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 */

#include <linux/module.h>
#include <linux/timer.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>

static int numlbs = 2;

struct fakelb_dev_priv {
	struct ieee802154_hw *hw;

	struct list_head list;
	struct fakelb_priv *fake;

	spinlock_t lock;
	bool working;
};

struct fakelb_priv {
	struct list_head list;
	rwlock_t lock;
};

static int
fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
{
	BUG_ON(!level);
	*level = 0xbe;

	return 0;
}

static int
fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
{
	pr_debug("set channel to %d\n", channel);

	return 0;
}

static void
fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
{
	struct sk_buff *newskb;

	spin_lock(&priv->lock);
	if (priv->working) {
		newskb = pskb_copy(skb, GFP_ATOMIC);
		if (newskb)
			ieee802154_rx_irqsafe(priv->hw, newskb, 0xcc);
	}
	spin_unlock(&priv->lock);
}

static int
fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
{
	struct fakelb_dev_priv *priv = hw->priv;
	struct fakelb_priv *fake = priv->fake;

	read_lock_bh(&fake->lock);
	if (priv->list.next == priv->list.prev) {
		/* we are the only one device */
		fakelb_hw_deliver(priv, skb);
	} else {
		struct fakelb_dev_priv *dp;
		list_for_each_entry(dp, &priv->fake->list, list) {
			if (dp != priv &&
			    (dp->hw->phy->current_channel ==
			     priv->hw->phy->current_channel))
				fakelb_hw_deliver(dp, skb);
		}
	}
	read_unlock_bh(&fake->lock);

	return 0;
}

static int
fakelb_hw_start(struct ieee802154_hw *hw) {
	struct fakelb_dev_priv *priv = hw->priv;
	int ret = 0;

	spin_lock(&priv->lock);
	if (priv->working)
		ret = -EBUSY;
	else
		priv->working = 1;
	spin_unlock(&priv->lock);

	return ret;
}

static void
fakelb_hw_stop(struct ieee802154_hw *hw) {
	struct fakelb_dev_priv *priv = hw->priv;

	spin_lock(&priv->lock);
	priv->working = 0;
	spin_unlock(&priv->lock);
}

static const struct ieee802154_ops fakelb_ops = {
	.owner = THIS_MODULE,
	.xmit_sync = fakelb_hw_xmit,
	.ed = fakelb_hw_ed,
	.set_channel = fakelb_hw_channel,
	.start = fakelb_hw_start,
	.stop = fakelb_hw_stop,
};

/* Number of dummy devices to be set up by this module. */
module_param(numlbs, int, 0);
MODULE_PARM_DESC(numlbs, " number of pseudo devices");

static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
{
	struct fakelb_dev_priv *priv;
	int err;
	struct ieee802154_hw *hw;

	hw = ieee802154_alloc_hw(sizeof(*priv), &fakelb_ops);
	if (!hw)
		return -ENOMEM;

	priv = hw->priv;
	priv->hw = hw;

	/* 868 MHz BPSK	802.15.4-2003 */
	hw->phy->supported.channels[0] |= 1;
	/* 915 MHz BPSK	802.15.4-2003 */
	hw->phy->supported.channels[0] |= 0x7fe;
	/* 2.4 GHz O-QPSK 802.15.4-2003 */
	hw->phy->supported.channels[0] |= 0x7FFF800;
	/* 868 MHz ASK 802.15.4-2006 */
	hw->phy->supported.channels[1] |= 1;
	/* 915 MHz ASK 802.15.4-2006 */
	hw->phy->supported.channels[1] |= 0x7fe;
	/* 868 MHz O-QPSK 802.15.4-2006 */
	hw->phy->supported.channels[2] |= 1;
	/* 915 MHz O-QPSK 802.15.4-2006 */
	hw->phy->supported.channels[2] |= 0x7fe;
	/* 2.4 GHz CSS 802.15.4a-2007 */
	hw->phy->supported.channels[3] |= 0x3fff;
	/* UWB Sub-gigahertz 802.15.4a-2007 */
	hw->phy->supported.channels[4] |= 1;
	/* UWB Low band 802.15.4a-2007 */
	hw->phy->supported.channels[4] |= 0x1e;
	/* UWB High band 802.15.4a-2007 */
	hw->phy->supported.channels[4] |= 0xffe0;
	/* 750 MHz O-QPSK 802.15.4c-2009 */
	hw->phy->supported.channels[5] |= 0xf;
	/* 750 MHz MPSK 802.15.4c-2009 */
	hw->phy->supported.channels[5] |= 0xf0;
	/* 950 MHz BPSK 802.15.4d-2009 */
	hw->phy->supported.channels[6] |= 0x3ff;
	/* 950 MHz GFSK 802.15.4d-2009 */
	hw->phy->supported.channels[6] |= 0x3ffc00;

	INIT_LIST_HEAD(&priv->list);
	priv->fake = fake;

	spin_lock_init(&priv->lock);

	hw->parent = dev;

	err = ieee802154_register_hw(hw);
	if (err)
		goto err_reg;

	write_lock_bh(&fake->lock);
	list_add_tail(&priv->list, &fake->list);
	write_unlock_bh(&fake->lock);

	return 0;

err_reg:
	ieee802154_free_hw(priv->hw);
	return err;
}

static void fakelb_del(struct fakelb_dev_priv *priv)
{
	write_lock_bh(&priv->fake->lock);
	list_del(&priv->list);
	write_unlock_bh(&priv->fake->lock);

	ieee802154_unregister_hw(priv->hw);
	ieee802154_free_hw(priv->hw);
}

static int fakelb_probe(struct platform_device *pdev)
{
	struct fakelb_priv *priv;
	struct fakelb_dev_priv *dp, *tmp;
	int err = -ENOMEM;
	int i;

	priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
			    GFP_KERNEL);
	if (!priv)
		goto err_alloc;

	INIT_LIST_HEAD(&priv->list);
	rwlock_init(&priv->lock);

	for (i = 0; i < numlbs; i++) {
		err = fakelb_add_one(&pdev->dev, priv);
		if (err < 0)
			goto err_slave;
	}

	platform_set_drvdata(pdev, priv);
	dev_info(&pdev->dev, "added ieee802154 hardware\n");
	return 0;

err_slave:
	list_for_each_entry_safe(dp, tmp, &priv->list, list)
		fakelb_del(dp);
err_alloc:
	return err;
}

static int fakelb_remove(struct platform_device *pdev)
{
	struct fakelb_priv *priv = platform_get_drvdata(pdev);
	struct fakelb_dev_priv *dp, *temp;

	list_for_each_entry_safe(dp, temp, &priv->list, list)
		fakelb_del(dp);

	return 0;
}

static struct platform_device *ieee802154fake_dev;

static struct platform_driver ieee802154fake_driver = {
	.probe = fakelb_probe,
	.remove = fakelb_remove,
	.driver = {
			.name = "ieee802154fakelb",
	},
};

static __init int fakelb_init_module(void)
{
	ieee802154fake_dev = platform_device_register_simple(
			     "ieee802154fakelb", -1, NULL, 0);
	return platform_driver_register(&ieee802154fake_driver);
}

static __exit void fake_remove_module(void)
{
	platform_driver_unregister(&ieee802154fake_driver);
	platform_device_unregister(ieee802154fake_dev);
}

module_init(fakelb_init_module);
module_exit(fake_remove_module);
MODULE_LICENSE("GPL");
Commit	Line	Data
e1e49b64	1	/*
	2	* Loopback IEEE 802.15.4 interface
	3	*
	4	* Copyright 2007-2012 Siemens AG
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
e1e49b64	15	* Written by:
	16	* Sergey Lapin <slapin@ossfans.org>
	17	* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
	18	* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
	19	*/
	20
	21	#include <linux/module.h>
	22	#include <linux/timer.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/netdevice.h>
12b5c38f	25	#include <linux/device.h>
e1e49b64	26	#include <linux/spinlock.h>
e1e49b64	27	#include <net/mac802154.h>
5ad60d36	28	#include <net/cfg802154.h>
e1e49b64	29
7e57905b	30	static int numlbs = 2;
e1e49b64	31
e1e49b64	32	struct fakelb_dev_priv {
5a504397	33	struct ieee802154_hw *hw;
e1e49b64	34
	35	struct list_head list;
	36	struct fakelb_priv *fake;
	37
	38	spinlock_t lock;
	39	bool working;
	40	};
	41
	42	struct fakelb_priv {
	43	struct list_head list;
	44	rwlock_t lock;
	45	};
	46
	47	static int
5a504397	48	fakelb_hw_ed(struct ieee802154_hw hw, u8 level)
e1e49b64	49	{
e1e49b64	50	BUG_ON(!level);
	51	*level = 0xbe;
	52
	53	return 0;
	54	}
	55
	56	static int
e37d2ec8	57	fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
e1e49b64	58	{
	59	pr_debug("set channel to %d\n", channel);
	60
e1e49b64	61	return 0;
	62	}
	63
	64	static void
	65	fakelb_hw_deliver(struct fakelb_dev_priv priv, struct sk_buff skb)
	66	{
	67	struct sk_buff *newskb;
	68
	69	spin_lock(&priv->lock);
	70	if (priv->working) {
	71	newskb = pskb_copy(skb, GFP_ATOMIC);
cb97d9a3 MT	72	if (newskb)
cb97d9a3 MT	73	ieee802154_rx_irqsafe(priv->hw, newskb, 0xcc);
e1e49b64	74	}
	75	spin_unlock(&priv->lock);
	76	}
	77
	78	static int
5a504397	79	fakelb_hw_xmit(struct ieee802154_hw hw, struct sk_buff skb)
e1e49b64	80	{
5a504397	81	struct fakelb_dev_priv *priv = hw->priv;
e1e49b64	82	struct fakelb_priv *fake = priv->fake;
e1e49b64	83
e1e49b64	84	read_lock_bh(&fake->lock);
	85	if (priv->list.next == priv->list.prev) {
	86	/* we are the only one device */
	87	fakelb_hw_deliver(priv, skb);
	88	} else {
	89	struct fakelb_dev_priv *dp;
	90	list_for_each_entry(dp, &priv->fake->list, list) {
	91	if (dp != priv &&
5a504397 AA	92	(dp->hw->phy->current_channel ==
5a504397 AA	93	priv->hw->phy->current_channel))
e1e49b64	94	fakelb_hw_deliver(dp, skb);
	95	}
	96	}
	97	read_unlock_bh(&fake->lock);
	98
	99	return 0;
	100	}
	101
	102	static int
5a504397 AA	103	fakelb_hw_start(struct ieee802154_hw *hw) {
5a504397 AA	104	struct fakelb_dev_priv *priv = hw->priv;
e1e49b64	105	int ret = 0;
	106
	107	spin_lock(&priv->lock);
	108	if (priv->working)
	109	ret = -EBUSY;
	110	else
	111	priv->working = 1;
	112	spin_unlock(&priv->lock);
	113
	114	return ret;
	115	}
	116
	117	static void
5a504397 AA	118	fakelb_hw_stop(struct ieee802154_hw *hw) {
5a504397 AA	119	struct fakelb_dev_priv *priv = hw->priv;
e1e49b64	120
	121	spin_lock(&priv->lock);
	122	priv->working = 0;
	123	spin_unlock(&priv->lock);
	124	}
	125
16301861	126	static const struct ieee802154_ops fakelb_ops = {
e1e49b64	127	.owner = THIS_MODULE,
ed0a5dce	128	.xmit_sync = fakelb_hw_xmit,
e1e49b64	129	.ed = fakelb_hw_ed,
	130	.set_channel = fakelb_hw_channel,
	131	.start = fakelb_hw_start,
	132	.stop = fakelb_hw_stop,
	133	};
	134
	135	/* Number of dummy devices to be set up by this module. */
	136	module_param(numlbs, int, 0);
	137	MODULE_PARM_DESC(numlbs, " number of pseudo devices");
	138
	139	static int fakelb_add_one(struct device dev, struct fakelb_priv fake)
	140	{
	141	struct fakelb_dev_priv *priv;
	142	int err;
5a504397	143	struct ieee802154_hw *hw;
e1e49b64	144
5a504397 AA	145	hw = ieee802154_alloc_hw(sizeof(*priv), &fakelb_ops);
5a504397 AA	146	if (!hw)
e1e49b64	147	return -ENOMEM;
e1e49b64	148
5a504397 AA	149	priv = hw->priv;
5a504397 AA	150	priv->hw = hw;
e1e49b64	151
e1e49b64	152	/* 868 MHz BPSK 802.15.4-2003 */
72f655e4	153	hw->phy->supported.channels[0] \|= 1;
e1e49b64	154	/* 915 MHz BPSK 802.15.4-2003 */
72f655e4	155	hw->phy->supported.channels[0] \|= 0x7fe;
e1e49b64	156	/* 2.4 GHz O-QPSK 802.15.4-2003 */
72f655e4	157	hw->phy->supported.channels[0] \|= 0x7FFF800;
e1e49b64	158	/* 868 MHz ASK 802.15.4-2006 */
72f655e4	159	hw->phy->supported.channels[1] \|= 1;
e1e49b64	160	/* 915 MHz ASK 802.15.4-2006 */
72f655e4	161	hw->phy->supported.channels[1] \|= 0x7fe;
e1e49b64	162	/* 868 MHz O-QPSK 802.15.4-2006 */
72f655e4	163	hw->phy->supported.channels[2] \|= 1;
e1e49b64	164	/* 915 MHz O-QPSK 802.15.4-2006 */
72f655e4	165	hw->phy->supported.channels[2] \|= 0x7fe;
e1e49b64	166	/* 2.4 GHz CSS 802.15.4a-2007 */
72f655e4	167	hw->phy->supported.channels[3] \|= 0x3fff;
e1e49b64	168	/* UWB Sub-gigahertz 802.15.4a-2007 */
72f655e4	169	hw->phy->supported.channels[4] \|= 1;
e1e49b64	170	/* UWB Low band 802.15.4a-2007 */
72f655e4	171	hw->phy->supported.channels[4] \|= 0x1e;
e1e49b64	172	/* UWB High band 802.15.4a-2007 */
72f655e4	173	hw->phy->supported.channels[4] \|= 0xffe0;
e1e49b64	174	/* 750 MHz O-QPSK 802.15.4c-2009 */
72f655e4	175	hw->phy->supported.channels[5] \|= 0xf;
e1e49b64	176	/* 750 MHz MPSK 802.15.4c-2009 */
72f655e4	177	hw->phy->supported.channels[5] \|= 0xf0;
e1e49b64	178	/* 950 MHz BPSK 802.15.4d-2009 */
72f655e4	179	hw->phy->supported.channels[6] \|= 0x3ff;
e1e49b64	180	/* 950 MHz GFSK 802.15.4d-2009 */
72f655e4	181	hw->phy->supported.channels[6] \|= 0x3ffc00;
e1e49b64	182
	183	INIT_LIST_HEAD(&priv->list);
	184	priv->fake = fake;
	185
	186	spin_lock_init(&priv->lock);
	187
5a504397	188	hw->parent = dev;
e1e49b64	189
5a504397	190	err = ieee802154_register_hw(hw);
e1e49b64	191	if (err)
	192	goto err_reg;
	193
	194	write_lock_bh(&fake->lock);
	195	list_add_tail(&priv->list, &fake->list);
	196	write_unlock_bh(&fake->lock);
	197
	198	return 0;
	199
	200	err_reg:
5a504397	201	ieee802154_free_hw(priv->hw);
e1e49b64	202	return err;
	203	}
	204
	205	static void fakelb_del(struct fakelb_dev_priv *priv)
	206	{
	207	write_lock_bh(&priv->fake->lock);
	208	list_del(&priv->list);
	209	write_unlock_bh(&priv->fake->lock);
	210
5a504397 AA	211	ieee802154_unregister_hw(priv->hw);
5a504397 AA	212	ieee802154_free_hw(priv->hw);
e1e49b64	213	}
e1e49b64	214
bb1f4606	215	static int fakelb_probe(struct platform_device *pdev)
e1e49b64	216	{
e1e49b64	217	struct fakelb_priv *priv;
3186d3d7	218	struct fakelb_dev_priv dp, tmp;
e1e49b64	219	int err = -ENOMEM;
	220	int i;
	221
12b5c38f HS	222	priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
12b5c38f HS	223	GFP_KERNEL);
e1e49b64	224	if (!priv)
	225	goto err_alloc;
	226
	227	INIT_LIST_HEAD(&priv->list);
	228	rwlock_init(&priv->lock);
	229
	230	for (i = 0; i < numlbs; i++) {
	231	err = fakelb_add_one(&pdev->dev, priv);
	232	if (err < 0)
	233	goto err_slave;
	234	}
	235
	236	platform_set_drvdata(pdev, priv);
	237	dev_info(&pdev->dev, "added ieee802154 hardware\n");
	238	return 0;
	239
	240	err_slave:
3186d3d7	241	list_for_each_entry_safe(dp, tmp, &priv->list, list)
e1e49b64	242	fakelb_del(dp);
e1e49b64	243	err_alloc:
	244	return err;
	245	}
	246
bb1f4606	247	static int fakelb_remove(struct platform_device *pdev)
e1e49b64	248	{
	249	struct fakelb_priv *priv = platform_get_drvdata(pdev);
	250	struct fakelb_dev_priv dp, temp;
	251
	252	list_for_each_entry_safe(dp, temp, &priv->list, list)
	253	fakelb_del(dp);
e1e49b64	254
	255	return 0;
	256	}
	257
	258	static struct platform_device *ieee802154fake_dev;
	259
	260	static struct platform_driver ieee802154fake_driver = {
	261	.probe = fakelb_probe,
bb1f4606	262	.remove = fakelb_remove,
e1e49b64	263	.driver = {
e1e49b64	264	.name = "ieee802154fakelb",
e1e49b64	265	},
	266	};
	267
	268	static __init int fakelb_init_module(void)
	269	{
	270	ieee802154fake_dev = platform_device_register_simple(
	271	"ieee802154fakelb", -1, NULL, 0);
	272	return platform_driver_register(&ieee802154fake_driver);
	273	}
	274
	275	static __exit void fake_remove_module(void)
	276	{
	277	platform_driver_unregister(&ieee802154fake_driver);
	278	platform_device_unregister(ieee802154fake_dev);
	279	}
	280
	281	module_init(fakelb_init_module);
	282	module_exit(fake_remove_module);
	283	MODULE_LICENSE("GPL");