[linux-2.6-block.git] / drivers / char / pcmcia / ipwireless / network.c

/*
 * IPWireless 3G PCMCIA Network Driver
 *
 * Original code
 *   by Stephen Blackheath <stephen@blacksapphire.com>,
 *      Ben Martel <benm@symmetric.co.nz>
 *
 * Copyrighted as follows:
 *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
 *
 * Various driver changes and rewrites, port to new kernels
 *   Copyright (C) 2006-2007 Jiri Kosina
 *
 * Misc code cleanups and updates
 *   Copyright (C) 2007 David Sterba
 */

#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/ppp_channel.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#include <linux/skbuff.h>

#include "network.h"
#include "hardware.h"
#include "main.h"
#include "tty.h"

#define MAX_OUTGOING_PACKETS_QUEUED   ipwireless_out_queue
#define MAX_ASSOCIATED_TTYS 2

#define SC_RCV_BITS     (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)

struct ipw_network {
	/* Hardware context, used for calls to hardware layer. */
	struct ipw_hardware *hardware;
	/* Context for kernel 'generic_ppp' functionality */
	struct ppp_channel *ppp_channel;
	/* tty context connected with IPW console */
	struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS];
	/* True if ppp needs waking up once we're ready to xmit */
	int ppp_blocked;
	/* Number of packets queued up in hardware module. */
	int outgoing_packets_queued;
	/* Spinlock to avoid interrupts during shutdown */
	spinlock_t spinlock;
	struct mutex close_lock;

	/* PPP ioctl data, not actually used anywere */
	unsigned int flags;
	unsigned int rbits;
	u32 xaccm[8];
	u32 raccm;
	int mru;

	int shutting_down;
	unsigned int ras_control_lines;

	struct work_struct work_go_online;
	struct work_struct work_go_offline;
};

static void notify_packet_sent(void *callback_data, unsigned int packet_length)
{
	struct ipw_network *network = callback_data;
	unsigned long flags;

	spin_lock_irqsave(&network->spinlock, flags);
	network->outgoing_packets_queued--;
	if (network->ppp_channel != NULL) {
		if (network->ppp_blocked) {
			network->ppp_blocked = 0;
			spin_unlock_irqrestore(&network->spinlock, flags);
			ppp_output_wakeup(network->ppp_channel);
			if (ipwireless_debug)
				printk(KERN_INFO IPWIRELESS_PCCARD_NAME
				       ": ppp unblocked\n");
		} else
			spin_unlock_irqrestore(&network->spinlock, flags);
	} else
		spin_unlock_irqrestore(&network->spinlock, flags);
}

/*
 * Called by the ppp system when it has a packet to send to the hardware.
 */
static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
				     struct sk_buff *skb)
{
	struct ipw_network *network = ppp_channel->private;
	unsigned long flags;

	spin_lock_irqsave(&network->spinlock, flags);
	if (network->outgoing_packets_queued < MAX_OUTGOING_PACKETS_QUEUED) {
		unsigned char *buf;
		static unsigned char header[] = {
			PPP_ALLSTATIONS, /* 0xff */
			PPP_UI,		 /* 0x03 */
		};
		int ret;

		network->outgoing_packets_queued++;
		spin_unlock_irqrestore(&network->spinlock, flags);

		/*
		 * If we have the requested amount of headroom in the skb we
		 * were handed, then we can add the header efficiently.
		 */
		if (skb_headroom(skb) >= 2) {
			memcpy(skb_push(skb, 2), header, 2);
			ret = ipwireless_send_packet(network->hardware,
					       IPW_CHANNEL_RAS, skb->data,
					       skb->len,
					       notify_packet_sent,
					       network);
			if (ret == -1) {
				skb_pull(skb, 2);
				return 0;
			}
		} else {
			/* Otherwise (rarely) we do it inefficiently. */
			buf = kmalloc(skb->len + 2, GFP_ATOMIC);
			if (!buf)
				return 0;
			memcpy(buf + 2, skb->data, skb->len);
			memcpy(buf, header, 2);
			ret = ipwireless_send_packet(network->hardware,
					       IPW_CHANNEL_RAS, buf,
					       skb->len + 2,
					       notify_packet_sent,
					       network);
			kfree(buf);
			if (ret == -1)
				return 0;
		}
		kfree_skb(skb);
		return 1;
	} else {
		/*
		 * Otherwise reject the packet, and flag that the ppp system
		 * needs to be unblocked once we are ready to send.
		 */
		network->ppp_blocked = 1;
		spin_unlock_irqrestore(&network->spinlock, flags);
		return 0;
	}
}

/* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */
static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel,
				unsigned int cmd, unsigned long arg)
{
	struct ipw_network *network = ppp_channel->private;
	int err, val;
	u32 accm[8];
	int __user *user_arg = (int __user *) arg;

	err = -EFAULT;
	switch (cmd) {
	case PPPIOCGFLAGS:
		val = network->flags | network->rbits;
		if (put_user(val, user_arg))
			break;
		err = 0;
		break;

	case PPPIOCSFLAGS:
		if (get_user(val, user_arg))
			break;
		network->flags = val & ~SC_RCV_BITS;
		network->rbits = val & SC_RCV_BITS;
		err = 0;
		break;

	case PPPIOCGASYNCMAP:
		if (put_user(network->xaccm[0], user_arg))
			break;
		err = 0;
		break;

	case PPPIOCSASYNCMAP:
		if (get_user(network->xaccm[0], user_arg))
			break;
		err = 0;
		break;

	case PPPIOCGRASYNCMAP:
		if (put_user(network->raccm, user_arg))
			break;
		err = 0;
		break;

	case PPPIOCSRASYNCMAP:
		if (get_user(network->raccm, user_arg))
			break;
		err = 0;
		break;

	case PPPIOCGXASYNCMAP:
		if (copy_to_user((void __user *) arg, network->xaccm,
					sizeof(network->xaccm)))
			break;
		err = 0;
		break;

	case PPPIOCSXASYNCMAP:
		if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
			break;
		accm[2] &= ~0x40000000U;	/* can't escape 0x5e */
		accm[3] |= 0x60000000U;	/* must escape 0x7d, 0x7e */
		memcpy(network->xaccm, accm, sizeof(network->xaccm));
		err = 0;
		break;

	case PPPIOCGMRU:
		if (put_user(network->mru, user_arg))
			break;
		err = 0;
		break;

	case PPPIOCSMRU:
		if (get_user(val, user_arg))
			break;
		if (val < PPP_MRU)
			val = PPP_MRU;
		network->mru = val;
		err = 0;
		break;

	default:
		err = -ENOTTY;
	}

	return err;
}

static struct ppp_channel_ops ipwireless_ppp_channel_ops = {
	.start_xmit = ipwireless_ppp_start_xmit,
	.ioctl      = ipwireless_ppp_ioctl
};

static void do_go_online(struct work_struct *work_go_online)
{
	struct ipw_network *network =
		container_of(work_go_online, struct ipw_network,
				work_go_online);
	unsigned long flags;

	spin_lock_irqsave(&network->spinlock, flags);
	if (!network->ppp_channel) {
		struct ppp_channel *channel;

		spin_unlock_irqrestore(&network->spinlock, flags);
		channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL);
		if (!channel) {
			printk(KERN_ERR IPWIRELESS_PCCARD_NAME
					": unable to allocate PPP channel\n");
			return;
		}
		channel->private = network;
		channel->mtu = 16384;	/* Wild guess */
		channel->hdrlen = 2;
		channel->ops = &ipwireless_ppp_channel_ops;

		network->flags = 0;
		network->rbits = 0;
		network->mru = PPP_MRU;
		memset(network->xaccm, 0, sizeof(network->xaccm));
		network->xaccm[0] = ~0U;
		network->xaccm[3] = 0x60000000U;
		network->raccm = ~0U;
		ppp_register_channel(channel);
		spin_lock_irqsave(&network->spinlock, flags);
		network->ppp_channel = channel;
	}
	spin_unlock_irqrestore(&network->spinlock, flags);
}

static void do_go_offline(struct work_struct *work_go_offline)
{
	struct ipw_network *network =
		container_of(work_go_offline, struct ipw_network,
				work_go_offline);
	unsigned long flags;

	mutex_lock(&network->close_lock);
	spin_lock_irqsave(&network->spinlock, flags);
	if (network->ppp_channel != NULL) {
		struct ppp_channel *channel = network->ppp_channel;

		network->ppp_channel = NULL;
		spin_unlock_irqrestore(&network->spinlock, flags);
		mutex_unlock(&network->close_lock);
		ppp_unregister_channel(channel);
	} else {
		spin_unlock_irqrestore(&network->spinlock, flags);
		mutex_unlock(&network->close_lock);
	}
}

void ipwireless_network_notify_control_line_change(struct ipw_network *network,
						   unsigned int channel_idx,
						   unsigned int control_lines,
						   unsigned int changed_mask)
{
	int i;

	if (channel_idx == IPW_CHANNEL_RAS)
		network->ras_control_lines = control_lines;

	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
		struct ipw_tty *tty =
			network->associated_ttys[channel_idx][i];

		/*
		 * If it's associated with a tty (other than the RAS channel
		 * when we're online), then send the data to that tty.  The RAS
		 * channel's data is handled above - it always goes through
		 * ppp_generic.
		 */
		if (tty)
			ipwireless_tty_notify_control_line_change(tty,
								  channel_idx,
								  control_lines,
								  changed_mask);
	}
}

/*
 * Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI)
 * bytes, which are required on sent packet, but not always present on received
 * packets
 */
static struct sk_buff *ipw_packet_received_skb(unsigned char *data,
					       unsigned int length)
{
	struct sk_buff *skb;

	if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) {
		length -= 2;
		data += 2;
	}

	skb = dev_alloc_skb(length + 4);
	skb_reserve(skb, 2);
	memcpy(skb_put(skb, length), data, length);

	return skb;
}

void ipwireless_network_packet_received(struct ipw_network *network,
					unsigned int channel_idx,
					unsigned char *data,
					unsigned int length)
{
	int i;
	unsigned long flags;

	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
		struct ipw_tty *tty = network->associated_ttys[channel_idx][i];

		if (!tty)
			continue;

		/*
		 * If it's associated with a tty (other than the RAS channel
		 * when we're online), then send the data to that tty.  The RAS
		 * channel's data is handled above - it always goes through
		 * ppp_generic.
		 */
		if (channel_idx == IPW_CHANNEL_RAS
				&& (network->ras_control_lines &
					IPW_CONTROL_LINE_DCD) != 0
				&& ipwireless_tty_is_modem(tty)) {
			/*
			 * If data came in on the RAS channel and this tty is
			 * the modem tty, and we are online, then we send it to
			 * the PPP layer.
			 */
			mutex_lock(&network->close_lock);
			spin_lock_irqsave(&network->spinlock, flags);
			if (network->ppp_channel != NULL) {
				struct sk_buff *skb;

				spin_unlock_irqrestore(&network->spinlock,
						flags);

				/* Send the data to the ppp_generic module. */
				skb = ipw_packet_received_skb(data, length);
				ppp_input(network->ppp_channel, skb);
			} else
				spin_unlock_irqrestore(&network->spinlock,
						flags);
			mutex_unlock(&network->close_lock);
		}
		/* Otherwise we send it out the tty. */
		else
			ipwireless_tty_received(tty, data, length);
	}
}

struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw)
{
	struct ipw_network *network =
		kzalloc(sizeof(struct ipw_network), GFP_ATOMIC);

	if (!network)
		return NULL;

	spin_lock_init(&network->spinlock);
	mutex_init(&network->close_lock);

	network->hardware = hw;

	INIT_WORK(&network->work_go_online, do_go_online);
	INIT_WORK(&network->work_go_offline, do_go_offline);

	ipwireless_associate_network(hw, network);

	return network;
}

void ipwireless_network_free(struct ipw_network *network)
{
	network->shutting_down = 1;

	ipwireless_ppp_close(network);
	flush_scheduled_work();

	ipwireless_stop_interrupts(network->hardware);
	ipwireless_associate_network(network->hardware, NULL);

	kfree(network);
}

void ipwireless_associate_network_tty(struct ipw_network *network,
				      unsigned int channel_idx,
				      struct ipw_tty *tty)
{
	int i;

	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
		if (network->associated_ttys[channel_idx][i] == NULL) {
			network->associated_ttys[channel_idx][i] = tty;
			break;
		}
}

void ipwireless_disassociate_network_ttys(struct ipw_network *network,
					  unsigned int channel_idx)
{
	int i;

	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
		network->associated_ttys[channel_idx][i] = NULL;
}

void ipwireless_ppp_open(struct ipw_network *network)
{
	if (ipwireless_debug)
		printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n");
	schedule_work(&network->work_go_online);
}

void ipwireless_ppp_close(struct ipw_network *network)
{
	/* Disconnect from the wireless network. */
	if (ipwireless_debug)
		printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n");
	schedule_work(&network->work_go_offline);
}

int ipwireless_ppp_channel_index(struct ipw_network *network)
{
	int ret = -1;
	unsigned long flags;

	spin_lock_irqsave(&network->spinlock, flags);
	if (network->ppp_channel != NULL)
		ret = ppp_channel_index(network->ppp_channel);
	spin_unlock_irqrestore(&network->spinlock, flags);

	return ret;
}

int ipwireless_ppp_unit_number(struct ipw_network *network)
{
	int ret = -1;
	unsigned long flags;

	spin_lock_irqsave(&network->spinlock, flags);
	if (network->ppp_channel != NULL)
		ret = ppp_unit_number(network->ppp_channel);
	spin_unlock_irqrestore(&network->spinlock, flags);

	return ret;
}
Commit	Line	Data
099dc4fb DS	1	/*
	2	* IPWireless 3G PCMCIA Network Driver
	3	*
	4	* Original code
	5	* by Stephen Blackheath <stephen@blacksapphire.com>,
	6	* Ben Martel <benm@symmetric.co.nz>
	7	*
	8	* Copyrighted as follows:
	9	* Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
	10	*
	11	* Various driver changes and rewrites, port to new kernels
	12	* Copyright (C) 2006-2007 Jiri Kosina
	13	*
	14	* Misc code cleanups and updates
	15	* Copyright (C) 2007 David Sterba
	16	*/
	17
	18	#include <linux/interrupt.h>
	19	#include <linux/kernel.h>
	20	#include <linux/mutex.h>
	21	#include <linux/netdevice.h>
	22	#include <linux/ppp_channel.h>
	23	#include <linux/ppp_defs.h>
	24	#include <linux/if_ppp.h>
	25	#include <linux/skbuff.h>
	26
	27	#include "network.h"
	28	#include "hardware.h"
	29	#include "main.h"
	30	#include "tty.h"
	31
	32	#define MAX_OUTGOING_PACKETS_QUEUED ipwireless_out_queue
	33	#define MAX_ASSOCIATED_TTYS 2
	34
	35	#define SC_RCV_BITS (SC_RCV_B7_1\|SC_RCV_B7_0\|SC_RCV_ODDP\|SC_RCV_EVNP)
	36
	37	struct ipw_network {
	38	/* Hardware context, used for calls to hardware layer. */
	39	struct ipw_hardware *hardware;
	40	/* Context for kernel 'generic_ppp' functionality */
	41	struct ppp_channel *ppp_channel;
	42	/* tty context connected with IPW console */
	43	struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS];
	44	/* True if ppp needs waking up once we're ready to xmit */
	45	int ppp_blocked;
	46	/* Number of packets queued up in hardware module. */
	47	int outgoing_packets_queued;
	48	/* Spinlock to avoid interrupts during shutdown */
	49	spinlock_t spinlock;
	50	struct mutex close_lock;
	51
	52	/* PPP ioctl data, not actually used anywere */
	53	unsigned int flags;
	54	unsigned int rbits;
	55	u32 xaccm[8];
	56	u32 raccm;
	57	int mru;
	58
	59	int shutting_down;
	60	unsigned int ras_control_lines;
	61
	62	struct work_struct work_go_online;
	63	struct work_struct work_go_offline;
	64	};
65
099dc4fb DS	66	static void notify_packet_sent(void *callback_data, unsigned int packet_length)
	67	{
	68	struct ipw_network *network = callback_data;
	69	unsigned long flags;
	70
	71	spin_lock_irqsave(&network->spinlock, flags);
	72	network->outgoing_packets_queued--;
	73	if (network->ppp_channel != NULL) {
	74	if (network->ppp_blocked) {
	75	network->ppp_blocked = 0;
	76	spin_unlock_irqrestore(&network->spinlock, flags);
	77	ppp_output_wakeup(network->ppp_channel);
	78	if (ipwireless_debug)
	79	printk(KERN_INFO IPWIRELESS_PCCARD_NAME
	80	": ppp unblocked\n");
	81	} else
	82	spin_unlock_irqrestore(&network->spinlock, flags);
	83	} else
	84	spin_unlock_irqrestore(&network->spinlock, flags);
	85	}
	86
	87	/*
	88	* Called by the ppp system when it has a packet to send to the hardware.
	89	*/
	90	static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
	91	struct sk_buff *skb)
	92	{
	93	struct ipw_network *network = ppp_channel->private;
	94	unsigned long flags;
	95
	96	spin_lock_irqsave(&network->spinlock, flags);
	97	if (network->outgoing_packets_queued < MAX_OUTGOING_PACKETS_QUEUED) {
	98	unsigned char *buf;
	99	static unsigned char header[] = {
	100	PPP_ALLSTATIONS, /* 0xff */
	101	PPP_UI, /* 0x03 */
	102	};
	103	int ret;
	104
	105	network->outgoing_packets_queued++;
	106	spin_unlock_irqrestore(&network->spinlock, flags);
	107
	108	/*
	109	* If we have the requested amount of headroom in the skb we
	110	* were handed, then we can add the header efficiently.
	111	*/
	112	if (skb_headroom(skb) >= 2) {
	113	memcpy(skb_push(skb, 2), header, 2);
	114	ret = ipwireless_send_packet(network->hardware,
	115	IPW_CHANNEL_RAS, skb->data,
	116	skb->len,
	117	notify_packet_sent,
	118	network);
	119	if (ret == -1) {
	120	skb_pull(skb, 2);
	121	return 0;
	122	}
	123	} else {
	124	/* Otherwise (rarely) we do it inefficiently. */
	125	buf = kmalloc(skb->len + 2, GFP_ATOMIC);
	126	if (!buf)
	127	return 0;
	128	memcpy(buf + 2, skb->data, skb->len);
	129	memcpy(buf, header, 2);
130	ret = ipwireless_send_packet(network->hardware,
131	IPW_CHANNEL_RAS, buf,
132	skb->len + 2,
133	notify_packet_sent,
134	network);
135	kfree(buf);
136	if (ret == -1)
137	return 0;
138	}
139	kfree_skb(skb);
140	return 1;
141	} else {
142	/*
143	* Otherwise reject the packet, and flag that the ppp system
144	* needs to be unblocked once we are ready to send.
145	*/
146	network->ppp_blocked = 1;
147	spin_unlock_irqrestore(&network->spinlock, flags);
148	return 0;
149	}
150	}
151
152	/* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */
153	static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel,
154	unsigned int cmd, unsigned long arg)
155	{
156	struct ipw_network *network = ppp_channel->private;
157	int err, val;
158	u32 accm[8];
159	int __user user_arg = (int __user ) arg;
160
161	err = -EFAULT;
162	switch (cmd) {
163	case PPPIOCGFLAGS:
164	val = network->flags \| network->rbits;
165	if (put_user(val, user_arg))
166	break;
167	err = 0;
168	break;
169
170	case PPPIOCSFLAGS:
171	if (get_user(val, user_arg))
172	break;
173	network->flags = val & ~SC_RCV_BITS;
174	network->rbits = val & SC_RCV_BITS;
175	err = 0;
176	break;
177
178	case PPPIOCGASYNCMAP:
179	if (put_user(network->xaccm[0], user_arg))
180	break;
181	err = 0;
182	break;
183
184	case PPPIOCSASYNCMAP:
185	if (get_user(network->xaccm[0], user_arg))
186	break;
187	err = 0;
188	break;
189
190	case PPPIOCGRASYNCMAP:
191	if (put_user(network->raccm, user_arg))
192	break;
193	err = 0;
194	break;
195
196	case PPPIOCSRASYNCMAP:
197	if (get_user(network->raccm, user_arg))
198	break;
199	err = 0;
200	break;
201
202	case PPPIOCGXASYNCMAP:
203	if (copy_to_user((void __user *) arg, network->xaccm,
204	sizeof(network->xaccm)))
205	break;
206	err = 0;
207	break;
208
209	case PPPIOCSXASYNCMAP:
210	if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
211	break;
212	accm[2] &= ~0x40000000U; /* can't escape 0x5e */
213	accm[3] \|= 0x60000000U; /* must escape 0x7d, 0x7e */
214	memcpy(network->xaccm, accm, sizeof(network->xaccm));
215	err = 0;
216	break;
217
218	case PPPIOCGMRU:
219	if (put_user(network->mru, user_arg))
220	break;
221	err = 0;
222	break;
223
224	case PPPIOCSMRU:
225	if (get_user(val, user_arg))
226	break;
227	if (val < PPP_MRU)
228	val = PPP_MRU;
229	network->mru = val;
230	err = 0;
231	break;
232
233	default:
234	err = -ENOTTY;
235	}
236
237	return err;
238	}
239
240	static struct ppp_channel_ops ipwireless_ppp_channel_ops = {
241	.start_xmit = ipwireless_ppp_start_xmit,
242	.ioctl = ipwireless_ppp_ioctl
243	};
244
245	static void do_go_online(struct work_struct *work_go_online)
246	{
247	struct ipw_network *network =
248	container_of(work_go_online, struct ipw_network,
249	work_go_online);
250	unsigned long flags;
251
252	spin_lock_irqsave(&network->spinlock, flags);
253	if (!network->ppp_channel) {
254	struct ppp_channel *channel;
255
256	spin_unlock_irqrestore(&network->spinlock, flags);
257	channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL);
258	if (!channel) {
259	printk(KERN_ERR IPWIRELESS_PCCARD_NAME
260	": unable to allocate PPP channel\n");
261	return;
262	}
263	channel->private = network;
264	channel->mtu = 16384; /* Wild guess */
265	channel->hdrlen = 2;
266	channel->ops = &ipwireless_ppp_channel_ops;
267
268	network->flags = 0;
269	network->rbits = 0;
270	network->mru = PPP_MRU;
271	memset(network->xaccm, 0, sizeof(network->xaccm));
272	network->xaccm[0] = ~0U;
273	network->xaccm[3] = 0x60000000U;
274	network->raccm = ~0U;
275	ppp_register_channel(channel);
276	spin_lock_irqsave(&network->spinlock, flags);
277	network->ppp_channel = channel;
278	}
279	spin_unlock_irqrestore(&network->spinlock, flags);
280	}
281
282	static void do_go_offline(struct work_struct *work_go_offline)
283	{
284	struct ipw_network *network =
285	container_of(work_go_offline, struct ipw_network,
286	work_go_offline);
287	unsigned long flags;
288
289	mutex_lock(&network->close_lock);
290	spin_lock_irqsave(&network->spinlock, flags);
291	if (network->ppp_channel != NULL) {
292	struct ppp_channel *channel = network->ppp_channel;
293
294	network->ppp_channel = NULL;
295	spin_unlock_irqrestore(&network->spinlock, flags);
296	mutex_unlock(&network->close_lock);
297	ppp_unregister_channel(channel);
298	} else {
299	spin_unlock_irqrestore(&network->spinlock, flags);
300	mutex_unlock(&network->close_lock);
301	}
302	}
303
304	void ipwireless_network_notify_control_line_change(struct ipw_network *network,
305	unsigned int channel_idx,
306	unsigned int control_lines,
307	unsigned int changed_mask)
308	{
309	int i;
310
311	if (channel_idx == IPW_CHANNEL_RAS)
312	network->ras_control_lines = control_lines;
313
314	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
315	struct ipw_tty *tty =
316	network->associated_ttys[channel_idx][i];
317
318	/*
319	* If it's associated with a tty (other than the RAS channel
320	* when we're online), then send the data to that tty. The RAS
321	* channel's data is handled above - it always goes through
322	* ppp_generic.
323	*/
324	if (tty)
325	ipwireless_tty_notify_control_line_change(tty,
326	channel_idx,
327	control_lines,
328	changed_mask);
329	}
330	}
331
332	/*
333	* Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI)
334	* bytes, which are required on sent packet, but not always present on received
335	* packets
336	*/
337	static struct sk_buff ipw_packet_received_skb(unsigned char data,
338	unsigned int length)
339	{
340	struct sk_buff *skb;
341
342	if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) {
343	length -= 2;
344	data += 2;
345	}
346
347	skb = dev_alloc_skb(length + 4);
348	skb_reserve(skb, 2);
349	memcpy(skb_put(skb, length), data, length);
350
351	return skb;
352	}
353
354	void ipwireless_network_packet_received(struct ipw_network *network,
355	unsigned int channel_idx,
356	unsigned char *data,
357	unsigned int length)
358	{
359	int i;
360	unsigned long flags;
361
362	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
363	struct ipw_tty *tty = network->associated_ttys[channel_idx][i];
364
a51f4124 DS	365	if (!tty)
	366	continue;
	367
099dc4fb DS	368	/*
	369	* If it's associated with a tty (other than the RAS channel
	370	* when we're online), then send the data to that tty. The RAS
	371	* channel's data is handled above - it always goes through
	372	* ppp_generic.
	373	*/
a51f4124	374	if (channel_idx == IPW_CHANNEL_RAS
099dc4fb DS	375	&& (network->ras_control_lines &
	376	IPW_CONTROL_LINE_DCD) != 0
	377	&& ipwireless_tty_is_modem(tty)) {
	378	/*
	379	* If data came in on the RAS channel and this tty is
	380	* the modem tty, and we are online, then we send it to
	381	* the PPP layer.
	382	*/
	383	mutex_lock(&network->close_lock);
	384	spin_lock_irqsave(&network->spinlock, flags);
	385	if (network->ppp_channel != NULL) {
	386	struct sk_buff *skb;
	387
	388	spin_unlock_irqrestore(&network->spinlock,
	389	flags);
	390
	391	/* Send the data to the ppp_generic module. */
	392	skb = ipw_packet_received_skb(data, length);
	393	ppp_input(network->ppp_channel, skb);
	394	} else
	395	spin_unlock_irqrestore(&network->spinlock,
	396	flags);
	397	mutex_unlock(&network->close_lock);
	398	}
	399	/* Otherwise we send it out the tty. */
	400	else
	401	ipwireless_tty_received(tty, data, length);
	402	}
	403	}
	404
	405	struct ipw_network ipwireless_network_create(struct ipw_hardware hw)
	406	{
	407	struct ipw_network *network =
	408	kzalloc(sizeof(struct ipw_network), GFP_ATOMIC);
	409
	410	if (!network)
	411	return NULL;
	412
	413	spin_lock_init(&network->spinlock);
	414	mutex_init(&network->close_lock);
	415
	416	network->hardware = hw;
	417
	418	INIT_WORK(&network->work_go_online, do_go_online);
	419	INIT_WORK(&network->work_go_offline, do_go_offline);
	420
	421	ipwireless_associate_network(hw, network);
	422
	423	return network;
	424	}
	425
	426	void ipwireless_network_free(struct ipw_network *network)
	427	{
	428	network->shutting_down = 1;
	429
	430	ipwireless_ppp_close(network);
	431	flush_scheduled_work();
	432
	433	ipwireless_stop_interrupts(network->hardware);
	434	ipwireless_associate_network(network->hardware, NULL);
	435
	436	kfree(network);
	437	}
	438
439	void ipwireless_associate_network_tty(struct ipw_network *network,
440	unsigned int channel_idx,
441	struct ipw_tty *tty)
442	{
443	int i;
444
445	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
446	if (network->associated_ttys[channel_idx][i] == NULL) {
447	network->associated_ttys[channel_idx][i] = tty;
448	break;
449	}
450	}
451
452	void ipwireless_disassociate_network_ttys(struct ipw_network *network,
453	unsigned int channel_idx)
454	{
455	int i;
456
457	for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
458	network->associated_ttys[channel_idx][i] = NULL;
459	}
460
461	void ipwireless_ppp_open(struct ipw_network *network)
462	{
463	if (ipwireless_debug)
464	printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n");
465	schedule_work(&network->work_go_online);
466	}
467
468	void ipwireless_ppp_close(struct ipw_network *network)
469	{
470	/* Disconnect from the wireless network. */
471	if (ipwireless_debug)
472	printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n");
473	schedule_work(&network->work_go_offline);
474	}
475
476	int ipwireless_ppp_channel_index(struct ipw_network *network)
477	{
478	int ret = -1;
479	unsigned long flags;
480
481	spin_lock_irqsave(&network->spinlock, flags);
482	if (network->ppp_channel != NULL)
483	ret = ppp_channel_index(network->ppp_channel);
484	spin_unlock_irqrestore(&network->spinlock, flags);
485
486	return ret;
487	}
488
489	int ipwireless_ppp_unit_number(struct ipw_network *network)
490	{
491	int ret = -1;
492	unsigned long flags;
493
494	spin_lock_irqsave(&network->spinlock, flags);
495	if (network->ppp_channel != NULL)
496	ret = ppp_unit_number(network->ppp_channel);
497	spin_unlock_irqrestore(&network->spinlock, flags);
498
499	return ret;
500	}