SUNRPC: don't map EKEYEXPIRED to EACCES in call_refreshresult
[linux-3.10.git] / net / caif / caif_usb.c
1 /*
2  * CAIF USB handler
3  * Copyright (C) ST-Ericsson AB 2011
4  * Author:      Sjur Brendeland
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>
14 #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
23 MODULE_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 */
29 #define STE_USB_PID_CAIF 0x230f /* Product id for CAIF Modems */
30
31 struct cfusbl {
32         struct cflayer layer;
33         u8 tx_eth_hdr[ETH_HLEN];
34 };
35
36 static bool pack_added;
37
38 static 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
48 static 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
77 static 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
84 static struct 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
119 static struct packet_type caif_usb_type __read_mostly = {
120         .type = cpu_to_be16(ETH_P_802_EX1),
121 };
122
123 static 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;
130         struct usb_device *usbdev;
131
132         /* Check whether we have a NCM device, and find its VID/PID. */
133         if (!(dev->dev.parent && dev->dev.parent->driver &&
134               strcmp(dev->dev.parent->driver->name, "cdc_ncm") == 0))
135                 return 0;
136
137         usbnet = netdev_priv(dev);
138         usbdev = usbnet->udev;
139
140         pr_debug("USB CDC NCM device VID:0x%4x PID:0x%4x\n",
141                 le16_to_cpu(usbdev->descriptor.idVendor),
142                 le16_to_cpu(usbdev->descriptor.idProduct));
143
144         /* Check for VID/PID that supports CAIF */
145         if (!(le16_to_cpu(usbdev->descriptor.idVendor) == STE_USB_VID &&
146                 le16_to_cpu(usbdev->descriptor.idProduct) == STE_USB_PID_CAIF))
147                 return 0;
148
149         if (what == NETDEV_UNREGISTER)
150                 module_put(THIS_MODULE);
151
152         if (what != NETDEV_REGISTER)
153                 return 0;
154
155         __module_get(THIS_MODULE);
156
157         memset(&common, 0, sizeof(common));
158         common.use_frag = false;
159         common.use_fcs = false;
160         common.use_stx = false;
161         common.link_select = CAIF_LINK_HIGH_BANDW;
162         common.flowctrl = NULL;
163
164         link_support = cfusbl_create(dev->ifindex, dev->dev_addr,
165                                         dev->broadcast);
166
167         if (!link_support)
168                 return -ENOMEM;
169
170         if (dev->num_tx_queues > 1)
171                 pr_warn("USB device uses more than one tx queue\n");
172
173         caif_enroll_dev(dev, &common, link_support, CFUSB_MAX_HEADLEN,
174                         &layer, &caif_usb_type.func);
175         if (!pack_added)
176                 dev_add_pack(&caif_usb_type);
177         pack_added = true;
178
179         strncpy(layer->name, dev->name,
180                         sizeof(layer->name) - 1);
181         layer->name[sizeof(layer->name) - 1] = 0;
182
183         return 0;
184 }
185
186 static struct notifier_block caif_device_notifier = {
187         .notifier_call = cfusbl_device_notify,
188         .priority = 0,
189 };
190
191 static int __init cfusbl_init(void)
192 {
193         return register_netdevice_notifier(&caif_device_notifier);
194 }
195
196 static void __exit cfusbl_exit(void)
197 {
198         unregister_netdevice_notifier(&caif_device_notifier);
199         dev_remove_pack(&caif_usb_type);
200 }
201
202 module_init(cfusbl_init);
203 module_exit(cfusbl_exit);