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1 | /* |
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> |
14 | #include <linux/netdevice.h> |
15 | #include <linux/mii.h> |
16 | #include <linux/usb.h> |
17 | #include <linux/usb/usbnet.h> |
18 | #include <net/netns/generic.h> |
19 | #include <net/caif/caif_dev.h> |
20 | #include <net/caif/caif_layer.h> |
21 | #include <net/caif/cfpkt.h> |
22 | #include <net/caif/cfcnfg.h> |
23 | |
24 | MODULE_LICENSE("GPL"); |
25 | |
26 | #define CFUSB_PAD_DESCR_SZ 1 /* Alignment descriptor length */ |
27 | #define CFUSB_ALIGNMENT 4 /* Number of bytes to align. */ |
28 | #define CFUSB_MAX_HEADLEN (CFUSB_PAD_DESCR_SZ + CFUSB_ALIGNMENT-1) |
29 | #define STE_USB_VID 0x04cc /* USB Product ID for ST-Ericsson */ |
30 | #define STE_USB_PID_CAIF 0x2306 /* Product id for CAIF Modems */ |
31 | |
32 | struct cfusbl { |
33 | struct cflayer layer; |
34 | u8 tx_eth_hdr[ETH_HLEN]; |
35 | }; |
36 | |
37 | static bool pack_added; |
38 | |
39 | static int cfusbl_receive(struct cflayer *layr, struct cfpkt *pkt) |
40 | { |
41 | u8 hpad; |
42 | |
43 | /* Remove padding. */ |
44 | cfpkt_extr_head(pkt, &hpad, 1); |
45 | cfpkt_extr_head(pkt, NULL, hpad); |
46 | return layr->up->receive(layr->up, pkt); |
47 | } |
48 | |
49 | static int cfusbl_transmit(struct cflayer *layr, struct cfpkt *pkt) |
50 | { |
51 | struct caif_payload_info *info; |
52 | u8 hpad; |
53 | u8 zeros[CFUSB_ALIGNMENT]; |
54 | struct sk_buff *skb; |
55 | struct cfusbl *usbl = container_of(layr, struct cfusbl, layer); |
56 | |
57 | skb = cfpkt_tonative(pkt); |
58 | |
59 | skb_reset_network_header(skb); |
60 | skb->protocol = htons(ETH_P_IP); |
61 | |
62 | info = cfpkt_info(pkt); |
63 | hpad = (info->hdr_len + CFUSB_PAD_DESCR_SZ) & (CFUSB_ALIGNMENT - 1); |
64 | |
65 | if (skb_headroom(skb) < ETH_HLEN + CFUSB_PAD_DESCR_SZ + hpad) { |
66 | pr_warn("Headroom to small\n"); |
67 | kfree_skb(skb); |
68 | return -EIO; |
69 | } |
70 | memset(zeros, 0, hpad); |
71 | |
72 | cfpkt_add_head(pkt, zeros, hpad); |
73 | cfpkt_add_head(pkt, &hpad, 1); |
74 | cfpkt_add_head(pkt, usbl->tx_eth_hdr, sizeof(usbl->tx_eth_hdr)); |
75 | return layr->dn->transmit(layr->dn, pkt); |
76 | } |
77 | |
78 | static void cfusbl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, |
79 | int phyid) |
80 | { |
81 | if (layr->up && layr->up->ctrlcmd) |
82 | layr->up->ctrlcmd(layr->up, ctrl, layr->id); |
83 | } |
84 | |
85 | struct cflayer *cfusbl_create(int phyid, u8 ethaddr[ETH_ALEN], |
86 | u8 braddr[ETH_ALEN]) |
87 | { |
88 | struct cfusbl *this = kmalloc(sizeof(struct cfusbl), GFP_ATOMIC); |
89 | |
90 | if (!this) { |
91 | pr_warn("Out of memory\n"); |
92 | return NULL; |
93 | } |
94 | caif_assert(offsetof(struct cfusbl, layer) == 0); |
95 | |
96 | memset(this, 0, sizeof(struct cflayer)); |
97 | this->layer.receive = cfusbl_receive; |
98 | this->layer.transmit = cfusbl_transmit; |
99 | this->layer.ctrlcmd = cfusbl_ctrlcmd; |
100 | snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "usb%d", phyid); |
101 | this->layer.id = phyid; |
102 | |
103 | /* |
104 | * Construct TX ethernet header: |
105 | * 0-5 destination address |
106 | * 5-11 source address |
107 | * 12-13 protocol type |
108 | */ |
109 | memcpy(&this->tx_eth_hdr[ETH_ALEN], braddr, ETH_ALEN); |
110 | memcpy(&this->tx_eth_hdr[ETH_ALEN], ethaddr, ETH_ALEN); |
111 | this->tx_eth_hdr[12] = cpu_to_be16(ETH_P_802_EX1) & 0xff; |
112 | this->tx_eth_hdr[13] = (cpu_to_be16(ETH_P_802_EX1) >> 8) & 0xff; |
113 | pr_debug("caif ethernet TX-header dst:%pM src:%pM type:%02x%02x\n", |
114 | this->tx_eth_hdr, this->tx_eth_hdr + ETH_ALEN, |
115 | this->tx_eth_hdr[12], this->tx_eth_hdr[13]); |
116 | |
117 | return (struct cflayer *) this; |
118 | } |
119 | |
120 | static struct packet_type caif_usb_type __read_mostly = { |
121 | .type = cpu_to_be16(ETH_P_802_EX1), |
122 | }; |
123 | |
124 | static int cfusbl_device_notify(struct notifier_block *me, unsigned long what, |
125 | void *arg) |
126 | { |
127 | struct net_device *dev = arg; |
128 | struct caif_dev_common common; |
129 | struct cflayer *layer, *link_support; |
130 | struct usbnet *usbnet = netdev_priv(dev); |
131 | struct usb_device *usbdev = usbnet->udev; |
132 | struct ethtool_drvinfo drvinfo; |
133 | |
134 | /* |
135 | * Quirks: High-jack ethtool to find if we have a NCM device, |
136 | * and find it's VID/PID. |
137 | */ |
138 | if (dev->ethtool_ops == NULL || dev->ethtool_ops->get_drvinfo == NULL) |
139 | return 0; |
140 | |
141 | dev->ethtool_ops->get_drvinfo(dev, &drvinfo); |
142 | if (strncmp(drvinfo.driver, "cdc_ncm", 7) != 0) |
143 | return 0; |
144 | |
145 | pr_debug("USB CDC NCM device VID:0x%4x PID:0x%4x\n", |
146 | le16_to_cpu(usbdev->descriptor.idVendor), |
147 | le16_to_cpu(usbdev->descriptor.idProduct)); |
148 | |
149 | /* Check for VID/PID that supports CAIF */ |
150 | if (!(le16_to_cpu(usbdev->descriptor.idVendor) == STE_USB_VID && |
151 | le16_to_cpu(usbdev->descriptor.idProduct) == STE_USB_PID_CAIF)) |
152 | return 0; |
153 | |
154 | if (what == NETDEV_UNREGISTER) |
155 | module_put(THIS_MODULE); |
156 | |
157 | if (what != NETDEV_REGISTER) |
158 | return 0; |
159 | |
160 | __module_get(THIS_MODULE); |
161 | |
162 | memset(&common, 0, sizeof(common)); |
163 | common.use_frag = false; |
164 | common.use_fcs = false; |
165 | common.use_stx = false; |
166 | common.link_select = CAIF_LINK_HIGH_BANDW; |
167 | common.flowctrl = NULL; |
168 | |
169 | link_support = cfusbl_create(dev->ifindex, dev->dev_addr, |
170 | dev->broadcast); |
171 | |
172 | if (!link_support) |
173 | return -ENOMEM; |
174 | |
175 | if (dev->num_tx_queues > 1) |
176 | pr_warn("USB device uses more than one tx queue\n"); |
177 | |
178 | caif_enroll_dev(dev, &common, link_support, CFUSB_MAX_HEADLEN, |
179 | &layer, &caif_usb_type.func); |
180 | if (!pack_added) |
181 | dev_add_pack(&caif_usb_type); |
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182 | pack_added = true; |
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183 | |
184 | strncpy(layer->name, dev->name, |
185 | sizeof(layer->name) - 1); |
186 | layer->name[sizeof(layer->name) - 1] = 0; |
187 | |
188 | return 0; |
189 | } |
190 | |
191 | static struct notifier_block caif_device_notifier = { |
192 | .notifier_call = cfusbl_device_notify, |
193 | .priority = 0, |
194 | }; |
195 | |
196 | static int __init cfusbl_init(void) |
197 | { |
198 | return register_netdevice_notifier(&caif_device_notifier); |
199 | } |
200 | |
201 | static void __exit cfusbl_exit(void) |
202 | { |
203 | unregister_netdevice_notifier(&caif_device_notifier); |
204 | dev_remove_pack(&caif_usb_type); |
205 | } |
206 | |
207 | module_init(cfusbl_init); |
208 | module_exit(cfusbl_exit); |