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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> |
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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 */ |
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29 | #define STE_USB_PID_CAIF 0x230f /* Product id for CAIF Modems */ |
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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 | 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 = 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); |
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181 | pack_added = true; |
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182 | |
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 | |
190 | static struct notifier_block caif_device_notifier = { |
191 | .notifier_call = cfusbl_device_notify, |
192 | .priority = 0, |
193 | }; |
194 | |
195 | static int __init cfusbl_init(void) |
196 | { |
197 | return register_netdevice_notifier(&caif_device_notifier); |
198 | } |
199 | |
200 | static void __exit cfusbl_exit(void) |
201 | { |
202 | unregister_netdevice_notifier(&caif_device_notifier); |
203 | dev_remove_pack(&caif_usb_type); |
204 | } |
205 | |
206 | module_init(cfusbl_init); |
207 | module_exit(cfusbl_exit); |