1 /*
2  * SBE 2T3E3 synchronous serial card driver for Linux
3  *
4  * Copyright (C) 2009-2010 Krzysztof Halasa <khc@pm.waw.pl>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of version 2 of the GNU General Public License
8  * as published by the Free Software Foundation.
9  *
10  * This code is based on a driver written by SBE Inc.
11  */
12 
13 #include <linux/capability.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/delay.h>
17 #include <linux/netdevice.h>
18 #include <linux/pci.h>
19 #include <linux/hdlc.h>
20 #include <linux/if_arp.h>
21 #include <linux/interrupt.h>
22 #include "2t3e3.h"
23 
t3e3_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)24 int t3e3_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
25 {
26 	struct channel *sc = dev_to_priv(dev);
27 	int cmd_2t3e3, len, rlen;
28 	t3e3_param_t param;
29 	t3e3_resp_t  resp;
30 	void *data = ifr->ifr_data + sizeof(cmd_2t3e3) + sizeof(len);
31 
32 	if (cmd == SIOCWANDEV)
33 		return hdlc_ioctl(dev, ifr, cmd);
34 	if (!capable(CAP_SYS_ADMIN))
35 		return -EPERM;
36 	if (cmd != SIOCDEVPRIVATE + 15)
37 		return -EINVAL;
38 
39 	if (copy_from_user(&cmd_2t3e3, ifr->ifr_data, sizeof(cmd_2t3e3)))
40 		return -EFAULT;
41 	if (copy_from_user(&len, ifr->ifr_data + sizeof(cmd_2t3e3), sizeof(len)))
42 		return -EFAULT;
43 
44 	if (len > sizeof(param))
45 		return -EFAULT;
46 
47 	if (len)
48 		if (copy_from_user(&param, data, len))
49 			return -EFAULT;
50 
51 	t3e3_if_config(sc, cmd_2t3e3, (char *)&param, &resp, &rlen);
52 
53 	if (rlen)
54 		if (copy_to_user(data, &resp, rlen))
55 			return -EFAULT;
56 
57 	return 0;
58 }
59 
t3e3_get_stats(struct net_device * dev)60 static struct net_device_stats* t3e3_get_stats(struct net_device *dev)
61 {
62 	struct net_device_stats *nstats = &dev->stats;
63 	struct channel *sc = dev_to_priv(dev);
64 	t3e3_stats_t *stats = &sc->s;
65 
66 	memset(nstats, 0, sizeof(struct net_device_stats));
67 	nstats->rx_packets = stats->in_packets;
68 	nstats->tx_packets = stats->out_packets;
69 	nstats->rx_bytes = stats->in_bytes;
70 	nstats->tx_bytes = stats->out_bytes;
71 
72 	nstats->rx_errors = stats->in_errors;
73 	nstats->tx_errors = stats->out_errors;
74 	nstats->rx_crc_errors = stats->in_error_crc;
75 
76 
77 	nstats->rx_dropped = stats->in_dropped;
78 	nstats->tx_dropped = stats->out_dropped;
79 	nstats->tx_carrier_errors = stats->out_error_lost_carr +
80 		stats->out_error_no_carr;
81 
82 	return nstats;
83 }
84 
t3e3_open(struct net_device * dev)85 int t3e3_open(struct net_device *dev)
86 {
87 	struct channel *sc = dev_to_priv(dev);
88 	int ret = hdlc_open(dev);
89 
90 	if (ret)
91 		return ret;
92 
93 	sc->r.flags |= SBE_2T3E3_FLAG_NETWORK_UP;
94 	dc_start(dev_to_priv(dev));
95 	netif_start_queue(dev);
96 	try_module_get(THIS_MODULE);
97 	return 0;
98 }
99 
t3e3_close(struct net_device * dev)100 int t3e3_close(struct net_device *dev)
101 {
102 	struct channel *sc = dev_to_priv(dev);
103 	hdlc_close(dev);
104 	netif_stop_queue(dev);
105 	dc_stop(sc);
106 	sc->r.flags &= ~SBE_2T3E3_FLAG_NETWORK_UP;
107 	module_put(THIS_MODULE);
108 	return 0;
109 }
110 
t3e3_attach(struct net_device * dev,unsigned short foo1,unsigned short foo2)111 static int t3e3_attach(struct net_device *dev, unsigned short foo1,
112 		       unsigned short foo2)
113 {
114 	return 0;
115 }
116 
117 static const struct net_device_ops t3e3_ops = {
118 	.ndo_open       = t3e3_open,
119 	.ndo_stop       = t3e3_close,
120 	.ndo_change_mtu = hdlc_change_mtu,
121 	.ndo_start_xmit = hdlc_start_xmit,
122 	.ndo_do_ioctl   = t3e3_ioctl,
123 	.ndo_get_stats  = t3e3_get_stats,
124 };
125 
setup_device(struct net_device * dev,struct channel * sc)126 int setup_device(struct net_device *dev, struct channel *sc)
127 {
128 	hdlc_device *hdlc = dev_to_hdlc(dev);
129 	int retval;
130 
131 	dev->base_addr = pci_resource_start(sc->pdev, 0);
132 	dev->irq = sc->pdev->irq;
133 	dev->netdev_ops = &t3e3_ops;
134 	dev->tx_queue_len = 100;
135 	hdlc->xmit = t3e3_if_start_xmit;
136 	hdlc->attach = t3e3_attach;
137 	if ((retval = register_hdlc_device(dev))) {
138 		dev_err(&sc->pdev->dev, "error registering HDLC device\n");
139 		return retval;
140 	}
141 	return 0;
142 }
143