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sjur.brandeland@stericsson.com7ad65bf2011-12-04 11:22:53 +00001/*
2 * CAIF USB handler
3 * Copyright (C) ST-Ericsson AB 2011
4 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com
5 * License terms: GNU General Public License (GPL) version 2
6 *
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
10
11#include <linux/module.h>
12#include <linux/netdevice.h>
13#include <linux/slab.h>
sjur.brandeland@stericsson.com7ad65bf2011-12-04 11:22:53 +000014#include <linux/mii.h>
15#include <linux/usb.h>
16#include <linux/usb/usbnet.h>
17#include <net/netns/generic.h>
18#include <net/caif/caif_dev.h>
19#include <net/caif/caif_layer.h>
20#include <net/caif/cfpkt.h>
21#include <net/caif/cfcnfg.h>
22
23MODULE_LICENSE("GPL");
24
25#define CFUSB_PAD_DESCR_SZ 1 /* Alignment descriptor length */
26#define CFUSB_ALIGNMENT 4 /* Number of bytes to align. */
27#define CFUSB_MAX_HEADLEN (CFUSB_PAD_DESCR_SZ + CFUSB_ALIGNMENT-1)
28#define STE_USB_VID 0x04cc /* USB Product ID for ST-Ericsson */
sjur.brandeland@stericsson.com3371bb32012-01-17 03:03:13 +000029#define STE_USB_PID_CAIF 0x230f /* Product id for CAIF Modems */
sjur.brandeland@stericsson.com7ad65bf2011-12-04 11:22:53 +000030
31struct cfusbl {
32 struct cflayer layer;
33 u8 tx_eth_hdr[ETH_HLEN];
34};
35
36static bool pack_added;
37
38static int cfusbl_receive(struct cflayer *layr, struct cfpkt *pkt)
39{
40 u8 hpad;
41
42 /* Remove padding. */
43 cfpkt_extr_head(pkt, &hpad, 1);
44 cfpkt_extr_head(pkt, NULL, hpad);
45 return layr->up->receive(layr->up, pkt);
46}
47
48static int cfusbl_transmit(struct cflayer *layr, struct cfpkt *pkt)
49{
50 struct caif_payload_info *info;
51 u8 hpad;
52 u8 zeros[CFUSB_ALIGNMENT];
53 struct sk_buff *skb;
54 struct cfusbl *usbl = container_of(layr, struct cfusbl, layer);
55
56 skb = cfpkt_tonative(pkt);
57
58 skb_reset_network_header(skb);
59 skb->protocol = htons(ETH_P_IP);
60
61 info = cfpkt_info(pkt);
62 hpad = (info->hdr_len + CFUSB_PAD_DESCR_SZ) & (CFUSB_ALIGNMENT - 1);
63
64 if (skb_headroom(skb) < ETH_HLEN + CFUSB_PAD_DESCR_SZ + hpad) {
65 pr_warn("Headroom to small\n");
66 kfree_skb(skb);
67 return -EIO;
68 }
69 memset(zeros, 0, hpad);
70
71 cfpkt_add_head(pkt, zeros, hpad);
72 cfpkt_add_head(pkt, &hpad, 1);
73 cfpkt_add_head(pkt, usbl->tx_eth_hdr, sizeof(usbl->tx_eth_hdr));
74 return layr->dn->transmit(layr->dn, pkt);
75}
76
77static void cfusbl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
78 int phyid)
79{
80 if (layr->up && layr->up->ctrlcmd)
81 layr->up->ctrlcmd(layr->up, ctrl, layr->id);
82}
83
84struct cflayer *cfusbl_create(int phyid, u8 ethaddr[ETH_ALEN],
85 u8 braddr[ETH_ALEN])
86{
87 struct cfusbl *this = kmalloc(sizeof(struct cfusbl), GFP_ATOMIC);
88
89 if (!this) {
90 pr_warn("Out of memory\n");
91 return NULL;
92 }
93 caif_assert(offsetof(struct cfusbl, layer) == 0);
94
95 memset(this, 0, sizeof(struct cflayer));
96 this->layer.receive = cfusbl_receive;
97 this->layer.transmit = cfusbl_transmit;
98 this->layer.ctrlcmd = cfusbl_ctrlcmd;
99 snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "usb%d", phyid);
100 this->layer.id = phyid;
101
102 /*
103 * Construct TX ethernet header:
104 * 0-5 destination address
105 * 5-11 source address
106 * 12-13 protocol type
107 */
108 memcpy(&this->tx_eth_hdr[ETH_ALEN], braddr, ETH_ALEN);
109 memcpy(&this->tx_eth_hdr[ETH_ALEN], ethaddr, ETH_ALEN);
110 this->tx_eth_hdr[12] = cpu_to_be16(ETH_P_802_EX1) & 0xff;
111 this->tx_eth_hdr[13] = (cpu_to_be16(ETH_P_802_EX1) >> 8) & 0xff;
112 pr_debug("caif ethernet TX-header dst:%pM src:%pM type:%02x%02x\n",
113 this->tx_eth_hdr, this->tx_eth_hdr + ETH_ALEN,
114 this->tx_eth_hdr[12], this->tx_eth_hdr[13]);
115
116 return (struct cflayer *) this;
117}
118
119static struct packet_type caif_usb_type __read_mostly = {
120 .type = cpu_to_be16(ETH_P_802_EX1),
121};
122
123static int cfusbl_device_notify(struct notifier_block *me, unsigned long what,
124 void *arg)
125{
126 struct net_device *dev = arg;
127 struct caif_dev_common common;
128 struct cflayer *layer, *link_support;
129 struct usbnet *usbnet = netdev_priv(dev);
130 struct usb_device *usbdev = usbnet->udev;
131 struct ethtool_drvinfo drvinfo;
132
133 /*
134 * Quirks: High-jack ethtool to find if we have a NCM device,
135 * and find it's VID/PID.
136 */
137 if (dev->ethtool_ops == NULL || dev->ethtool_ops->get_drvinfo == NULL)
138 return 0;
139
140 dev->ethtool_ops->get_drvinfo(dev, &drvinfo);
141 if (strncmp(drvinfo.driver, "cdc_ncm", 7) != 0)
142 return 0;
143
144 pr_debug("USB CDC NCM device VID:0x%4x PID:0x%4x\n",
145 le16_to_cpu(usbdev->descriptor.idVendor),
146 le16_to_cpu(usbdev->descriptor.idProduct));
147
148 /* Check for VID/PID that supports CAIF */
149 if (!(le16_to_cpu(usbdev->descriptor.idVendor) == STE_USB_VID &&
150 le16_to_cpu(usbdev->descriptor.idProduct) == STE_USB_PID_CAIF))
151 return 0;
152
153 if (what == NETDEV_UNREGISTER)
154 module_put(THIS_MODULE);
155
156 if (what != NETDEV_REGISTER)
157 return 0;
158
159 __module_get(THIS_MODULE);
160
161 memset(&common, 0, sizeof(common));
162 common.use_frag = false;
163 common.use_fcs = false;
164 common.use_stx = false;
165 common.link_select = CAIF_LINK_HIGH_BANDW;
166 common.flowctrl = NULL;
167
168 link_support = cfusbl_create(dev->ifindex, dev->dev_addr,
169 dev->broadcast);
170
171 if (!link_support)
172 return -ENOMEM;
173
174 if (dev->num_tx_queues > 1)
175 pr_warn("USB device uses more than one tx queue\n");
176
177 caif_enroll_dev(dev, &common, link_support, CFUSB_MAX_HEADLEN,
178 &layer, &caif_usb_type.func);
179 if (!pack_added)
180 dev_add_pack(&caif_usb_type);
Rusty Russell3db1cd52011-12-19 13:56:45 +0000181 pack_added = true;
sjur.brandeland@stericsson.com7ad65bf2011-12-04 11:22:53 +0000182
183 strncpy(layer->name, dev->name,
184 sizeof(layer->name) - 1);
185 layer->name[sizeof(layer->name) - 1] = 0;
186
187 return 0;
188}
189
190static struct notifier_block caif_device_notifier = {
191 .notifier_call = cfusbl_device_notify,
192 .priority = 0,
193};
194
195static int __init cfusbl_init(void)
196{
197 return register_netdevice_notifier(&caif_device_notifier);
198}
199
200static void __exit cfusbl_exit(void)
201{
202 unregister_netdevice_notifier(&caif_device_notifier);
203 dev_remove_pack(&caif_usb_type);
204}
205
206module_init(cfusbl_init);
207module_exit(cfusbl_exit);