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508 lines
12 KiB
508 lines
12 KiB
/*
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* IPWireless 3G PCMCIA Network Driver
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*
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* Original code
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* by Stephen Blackheath <stephen@blacksapphire.com>,
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* Ben Martel <benm@symmetric.co.nz>
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*
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* Copyrighted as follows:
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* Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
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*
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* Various driver changes and rewrites, port to new kernels
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* Copyright (C) 2006-2007 Jiri Kosina
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*
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* Misc code cleanups and updates
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* Copyright (C) 2007 David Sterba
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*/
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/ppp_channel.h>
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#include <linux/ppp_defs.h>
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#include <linux/slab.h>
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#include <linux/if_ppp.h>
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#include <linux/skbuff.h>
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#include "network.h"
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#include "hardware.h"
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#include "main.h"
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#include "tty.h"
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#define MAX_ASSOCIATED_TTYS 2
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#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
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struct ipw_network {
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/* Hardware context, used for calls to hardware layer. */
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struct ipw_hardware *hardware;
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/* Context for kernel 'generic_ppp' functionality */
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struct ppp_channel *ppp_channel;
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/* tty context connected with IPW console */
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struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS];
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/* True if ppp needs waking up once we're ready to xmit */
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int ppp_blocked;
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/* Number of packets queued up in hardware module. */
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int outgoing_packets_queued;
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/* Spinlock to avoid interrupts during shutdown */
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spinlock_t lock;
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struct mutex close_lock;
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/* PPP ioctl data, not actually used anywere */
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unsigned int flags;
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unsigned int rbits;
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u32 xaccm[8];
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u32 raccm;
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int mru;
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int shutting_down;
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unsigned int ras_control_lines;
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struct work_struct work_go_online;
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struct work_struct work_go_offline;
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};
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static void notify_packet_sent(void *callback_data, unsigned int packet_length)
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{
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struct ipw_network *network = callback_data;
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unsigned long flags;
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spin_lock_irqsave(&network->lock, flags);
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network->outgoing_packets_queued--;
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if (network->ppp_channel != NULL) {
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if (network->ppp_blocked) {
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network->ppp_blocked = 0;
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spin_unlock_irqrestore(&network->lock, flags);
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ppp_output_wakeup(network->ppp_channel);
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if (ipwireless_debug)
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printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
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": ppp unblocked\n");
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} else
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spin_unlock_irqrestore(&network->lock, flags);
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} else
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spin_unlock_irqrestore(&network->lock, flags);
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}
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/*
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* Called by the ppp system when it has a packet to send to the hardware.
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*/
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static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
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struct sk_buff *skb)
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{
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struct ipw_network *network = ppp_channel->private;
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unsigned long flags;
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spin_lock_irqsave(&network->lock, flags);
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if (network->outgoing_packets_queued < ipwireless_out_queue) {
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unsigned char *buf;
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static unsigned char header[] = {
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PPP_ALLSTATIONS, /* 0xff */
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PPP_UI, /* 0x03 */
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};
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int ret;
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network->outgoing_packets_queued++;
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spin_unlock_irqrestore(&network->lock, flags);
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/*
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* If we have the requested amount of headroom in the skb we
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* were handed, then we can add the header efficiently.
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*/
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if (skb_headroom(skb) >= 2) {
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memcpy(skb_push(skb, 2), header, 2);
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ret = ipwireless_send_packet(network->hardware,
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IPW_CHANNEL_RAS, skb->data,
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skb->len,
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notify_packet_sent,
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network);
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if (ret == -1) {
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skb_pull(skb, 2);
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return 0;
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}
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} else {
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/* Otherwise (rarely) we do it inefficiently. */
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buf = kmalloc(skb->len + 2, GFP_ATOMIC);
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if (!buf)
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return 0;
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memcpy(buf + 2, skb->data, skb->len);
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memcpy(buf, header, 2);
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ret = ipwireless_send_packet(network->hardware,
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IPW_CHANNEL_RAS, buf,
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skb->len + 2,
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notify_packet_sent,
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network);
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kfree(buf);
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if (ret == -1)
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return 0;
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}
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kfree_skb(skb);
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return 1;
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} else {
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/*
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* Otherwise reject the packet, and flag that the ppp system
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* needs to be unblocked once we are ready to send.
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*/
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network->ppp_blocked = 1;
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spin_unlock_irqrestore(&network->lock, flags);
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if (ipwireless_debug)
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printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": ppp blocked\n");
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return 0;
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}
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}
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/* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */
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static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel,
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unsigned int cmd, unsigned long arg)
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{
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struct ipw_network *network = ppp_channel->private;
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int err, val;
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u32 accm[8];
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int __user *user_arg = (int __user *) arg;
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err = -EFAULT;
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switch (cmd) {
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case PPPIOCGFLAGS:
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val = network->flags | network->rbits;
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if (put_user(val, user_arg))
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break;
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err = 0;
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break;
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case PPPIOCSFLAGS:
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if (get_user(val, user_arg))
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break;
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network->flags = val & ~SC_RCV_BITS;
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network->rbits = val & SC_RCV_BITS;
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err = 0;
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break;
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case PPPIOCGASYNCMAP:
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if (put_user(network->xaccm[0], user_arg))
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break;
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err = 0;
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break;
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case PPPIOCSASYNCMAP:
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if (get_user(network->xaccm[0], user_arg))
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break;
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err = 0;
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break;
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case PPPIOCGRASYNCMAP:
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if (put_user(network->raccm, user_arg))
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break;
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err = 0;
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break;
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case PPPIOCSRASYNCMAP:
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if (get_user(network->raccm, user_arg))
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break;
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err = 0;
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break;
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case PPPIOCGXASYNCMAP:
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if (copy_to_user((void __user *) arg, network->xaccm,
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sizeof(network->xaccm)))
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break;
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err = 0;
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break;
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case PPPIOCSXASYNCMAP:
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if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
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break;
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accm[2] &= ~0x40000000U; /* can't escape 0x5e */
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accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
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memcpy(network->xaccm, accm, sizeof(network->xaccm));
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err = 0;
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break;
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case PPPIOCGMRU:
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if (put_user(network->mru, user_arg))
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break;
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err = 0;
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break;
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case PPPIOCSMRU:
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if (get_user(val, user_arg))
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break;
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if (val < PPP_MRU)
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val = PPP_MRU;
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network->mru = val;
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err = 0;
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break;
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default:
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err = -ENOTTY;
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}
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return err;
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}
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static const struct ppp_channel_ops ipwireless_ppp_channel_ops = {
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.start_xmit = ipwireless_ppp_start_xmit,
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.ioctl = ipwireless_ppp_ioctl
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};
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static void do_go_online(struct work_struct *work_go_online)
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{
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struct ipw_network *network =
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container_of(work_go_online, struct ipw_network,
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work_go_online);
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unsigned long flags;
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spin_lock_irqsave(&network->lock, flags);
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if (!network->ppp_channel) {
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struct ppp_channel *channel;
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spin_unlock_irqrestore(&network->lock, flags);
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channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL);
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if (!channel) {
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printk(KERN_ERR IPWIRELESS_PCCARD_NAME
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": unable to allocate PPP channel\n");
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return;
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}
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channel->private = network;
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channel->mtu = 16384; /* Wild guess */
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channel->hdrlen = 2;
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channel->ops = &ipwireless_ppp_channel_ops;
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network->flags = 0;
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network->rbits = 0;
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network->mru = PPP_MRU;
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memset(network->xaccm, 0, sizeof(network->xaccm));
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network->xaccm[0] = ~0U;
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network->xaccm[3] = 0x60000000U;
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network->raccm = ~0U;
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ppp_register_channel(channel);
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spin_lock_irqsave(&network->lock, flags);
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network->ppp_channel = channel;
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}
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spin_unlock_irqrestore(&network->lock, flags);
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}
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static void do_go_offline(struct work_struct *work_go_offline)
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{
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struct ipw_network *network =
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container_of(work_go_offline, struct ipw_network,
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work_go_offline);
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unsigned long flags;
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mutex_lock(&network->close_lock);
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spin_lock_irqsave(&network->lock, flags);
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if (network->ppp_channel != NULL) {
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struct ppp_channel *channel = network->ppp_channel;
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network->ppp_channel = NULL;
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spin_unlock_irqrestore(&network->lock, flags);
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mutex_unlock(&network->close_lock);
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ppp_unregister_channel(channel);
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} else {
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spin_unlock_irqrestore(&network->lock, flags);
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mutex_unlock(&network->close_lock);
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}
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}
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void ipwireless_network_notify_control_line_change(struct ipw_network *network,
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unsigned int channel_idx,
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unsigned int control_lines,
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unsigned int changed_mask)
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{
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int i;
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if (channel_idx == IPW_CHANNEL_RAS)
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network->ras_control_lines = control_lines;
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for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
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struct ipw_tty *tty =
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network->associated_ttys[channel_idx][i];
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/*
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* If it's associated with a tty (other than the RAS channel
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* when we're online), then send the data to that tty. The RAS
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* channel's data is handled above - it always goes through
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* ppp_generic.
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*/
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if (tty)
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ipwireless_tty_notify_control_line_change(tty,
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channel_idx,
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control_lines,
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changed_mask);
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}
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}
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/*
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* Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI)
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* bytes, which are required on sent packet, but not always present on received
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* packets
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*/
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static struct sk_buff *ipw_packet_received_skb(unsigned char *data,
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unsigned int length)
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{
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struct sk_buff *skb;
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if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) {
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length -= 2;
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data += 2;
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}
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skb = dev_alloc_skb(length + 4);
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skb_reserve(skb, 2);
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memcpy(skb_put(skb, length), data, length);
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return skb;
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}
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void ipwireless_network_packet_received(struct ipw_network *network,
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unsigned int channel_idx,
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unsigned char *data,
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unsigned int length)
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{
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int i;
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unsigned long flags;
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for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
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struct ipw_tty *tty = network->associated_ttys[channel_idx][i];
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if (!tty)
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continue;
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/*
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* If it's associated with a tty (other than the RAS channel
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* when we're online), then send the data to that tty. The RAS
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* channel's data is handled above - it always goes through
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* ppp_generic.
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*/
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if (channel_idx == IPW_CHANNEL_RAS
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&& (network->ras_control_lines &
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IPW_CONTROL_LINE_DCD) != 0
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&& ipwireless_tty_is_modem(tty)) {
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/*
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* If data came in on the RAS channel and this tty is
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* the modem tty, and we are online, then we send it to
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* the PPP layer.
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*/
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mutex_lock(&network->close_lock);
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spin_lock_irqsave(&network->lock, flags);
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if (network->ppp_channel != NULL) {
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struct sk_buff *skb;
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spin_unlock_irqrestore(&network->lock,
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flags);
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/* Send the data to the ppp_generic module. */
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skb = ipw_packet_received_skb(data, length);
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ppp_input(network->ppp_channel, skb);
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} else
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spin_unlock_irqrestore(&network->lock,
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flags);
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mutex_unlock(&network->close_lock);
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}
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/* Otherwise we send it out the tty. */
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else
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ipwireless_tty_received(tty, data, length);
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}
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}
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struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw)
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{
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struct ipw_network *network =
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kzalloc(sizeof(struct ipw_network), GFP_ATOMIC);
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if (!network)
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return NULL;
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spin_lock_init(&network->lock);
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mutex_init(&network->close_lock);
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network->hardware = hw;
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INIT_WORK(&network->work_go_online, do_go_online);
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INIT_WORK(&network->work_go_offline, do_go_offline);
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ipwireless_associate_network(hw, network);
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return network;
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}
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void ipwireless_network_free(struct ipw_network *network)
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{
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network->shutting_down = 1;
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ipwireless_ppp_close(network);
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flush_work_sync(&network->work_go_online);
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flush_work_sync(&network->work_go_offline);
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ipwireless_stop_interrupts(network->hardware);
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ipwireless_associate_network(network->hardware, NULL);
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kfree(network);
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}
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void ipwireless_associate_network_tty(struct ipw_network *network,
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unsigned int channel_idx,
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struct ipw_tty *tty)
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{
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int i;
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for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
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if (network->associated_ttys[channel_idx][i] == NULL) {
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network->associated_ttys[channel_idx][i] = tty;
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break;
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}
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}
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void ipwireless_disassociate_network_ttys(struct ipw_network *network,
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unsigned int channel_idx)
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{
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int i;
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for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
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network->associated_ttys[channel_idx][i] = NULL;
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}
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void ipwireless_ppp_open(struct ipw_network *network)
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{
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if (ipwireless_debug)
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printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n");
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schedule_work(&network->work_go_online);
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}
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void ipwireless_ppp_close(struct ipw_network *network)
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{
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/* Disconnect from the wireless network. */
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if (ipwireless_debug)
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printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n");
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schedule_work(&network->work_go_offline);
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}
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int ipwireless_ppp_channel_index(struct ipw_network *network)
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{
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int ret = -1;
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unsigned long flags;
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spin_lock_irqsave(&network->lock, flags);
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if (network->ppp_channel != NULL)
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ret = ppp_channel_index(network->ppp_channel);
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spin_unlock_irqrestore(&network->lock, flags);
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return ret;
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}
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int ipwireless_ppp_unit_number(struct ipw_network *network)
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{
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int ret = -1;
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unsigned long flags;
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spin_lock_irqsave(&network->lock, flags);
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if (network->ppp_channel != NULL)
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ret = ppp_unit_number(network->ppp_channel);
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spin_unlock_irqrestore(&network->lock, flags);
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return ret;
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}
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int ipwireless_ppp_mru(const struct ipw_network *network)
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{
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return network->mru;
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}
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