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af873fce | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7ad65bf6 | 2 | /* |
3 | * CAIF USB handler | |
4 | * Copyright (C) ST-Ericsson AB 2011 | |
26ee65e6 | 5 | * Author: Sjur Brendeland |
7ad65bf6 | 6 | */ |
7 | ||
8 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/netdevice.h> | |
12 | #include <linux/slab.h> | |
7ad65bf6 | 13 | #include <linux/mii.h> |
14 | #include <linux/usb.h> | |
15 | #include <linux/usb/usbnet.h> | |
14e48144 | 16 | #include <linux/etherdevice.h> |
7ad65bf6 | 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 */ | |
3371bb3f | 29 | #define STE_USB_PID_CAIF 0x230f /* Product id for CAIF Modems */ |
7ad65bf6 | 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) { | |
43d88774 | 65 | pr_warn("Headroom too small\n"); |
7ad65bf6 | 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, | |
3bffc475 | 78 | int phyid) |
7ad65bf6 | 79 | { |
80 | if (layr->up && layr->up->ctrlcmd) | |
81 | layr->up->ctrlcmd(layr->up, ctrl, layr->id); | |
82 | } | |
83 | ||
5520fb42 | 84 | static struct cflayer *cfusbl_create(int phyid, const u8 ethaddr[ETH_ALEN], |
d2123be0 | 85 | u8 braddr[ETH_ALEN]) |
7ad65bf6 | 86 | { |
87 | struct cfusbl *this = kmalloc(sizeof(struct cfusbl), GFP_ATOMIC); | |
88 | ||
7970f191 | 89 | if (!this) |
7ad65bf6 | 90 | return NULL; |
7970f191 | 91 | |
7ad65bf6 | 92 | caif_assert(offsetof(struct cfusbl, layer) == 0); |
93 | ||
91c4467e | 94 | memset(&this->layer, 0, sizeof(this->layer)); |
7ad65bf6 | 95 | this->layer.receive = cfusbl_receive; |
96 | this->layer.transmit = cfusbl_transmit; | |
97 | this->layer.ctrlcmd = cfusbl_ctrlcmd; | |
98 | snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "usb%d", phyid); | |
99 | this->layer.id = phyid; | |
100 | ||
101 | /* | |
102 | * Construct TX ethernet header: | |
103 | * 0-5 destination address | |
104 | * 5-11 source address | |
105 | * 12-13 protocol type | |
106 | */ | |
34b2cff4 JP |
107 | ether_addr_copy(&this->tx_eth_hdr[ETH_ALEN], braddr); |
108 | ether_addr_copy(&this->tx_eth_hdr[ETH_ALEN], ethaddr); | |
7ad65bf6 | 109 | this->tx_eth_hdr[12] = cpu_to_be16(ETH_P_802_EX1) & 0xff; |
110 | this->tx_eth_hdr[13] = (cpu_to_be16(ETH_P_802_EX1) >> 8) & 0xff; | |
111 | pr_debug("caif ethernet TX-header dst:%pM src:%pM type:%02x%02x\n", | |
112 | this->tx_eth_hdr, this->tx_eth_hdr + ETH_ALEN, | |
113 | this->tx_eth_hdr[12], this->tx_eth_hdr[13]); | |
114 | ||
115 | return (struct cflayer *) this; | |
116 | } | |
117 | ||
7f5d8666 PS |
118 | static void cfusbl_release(struct cflayer *layer) |
119 | { | |
120 | kfree(layer); | |
121 | } | |
122 | ||
7ad65bf6 | 123 | static struct packet_type caif_usb_type __read_mostly = { |
124 | .type = cpu_to_be16(ETH_P_802_EX1), | |
125 | }; | |
126 | ||
127 | static int cfusbl_device_notify(struct notifier_block *me, unsigned long what, | |
351638e7 | 128 | void *ptr) |
7ad65bf6 | 129 | { |
351638e7 | 130 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7ad65bf6 | 131 | struct caif_dev_common common; |
132 | struct cflayer *layer, *link_support; | |
40663634 BH |
133 | struct usbnet *usbnet; |
134 | struct usb_device *usbdev; | |
7f5d8666 | 135 | int res; |
7ad65bf6 | 136 | |
9781e98a SY |
137 | if (what == NETDEV_UNREGISTER && dev->reg_state >= NETREG_UNREGISTERED) |
138 | return 0; | |
139 | ||
65d2897c BH |
140 | /* Check whether we have a NCM device, and find its VID/PID. */ |
141 | if (!(dev->dev.parent && dev->dev.parent->driver && | |
142 | strcmp(dev->dev.parent->driver->name, "cdc_ncm") == 0)) | |
7ad65bf6 | 143 | return 0; |
144 | ||
40663634 BH |
145 | usbnet = netdev_priv(dev); |
146 | usbdev = usbnet->udev; | |
147 | ||
7ad65bf6 | 148 | pr_debug("USB CDC NCM device VID:0x%4x PID:0x%4x\n", |
149 | le16_to_cpu(usbdev->descriptor.idVendor), | |
150 | le16_to_cpu(usbdev->descriptor.idProduct)); | |
151 | ||
152 | /* Check for VID/PID that supports CAIF */ | |
153 | if (!(le16_to_cpu(usbdev->descriptor.idVendor) == STE_USB_VID && | |
154 | le16_to_cpu(usbdev->descriptor.idProduct) == STE_USB_PID_CAIF)) | |
155 | return 0; | |
156 | ||
157 | if (what == NETDEV_UNREGISTER) | |
158 | module_put(THIS_MODULE); | |
159 | ||
160 | if (what != NETDEV_REGISTER) | |
161 | return 0; | |
162 | ||
163 | __module_get(THIS_MODULE); | |
164 | ||
165 | memset(&common, 0, sizeof(common)); | |
166 | common.use_frag = false; | |
167 | common.use_fcs = false; | |
168 | common.use_stx = false; | |
169 | common.link_select = CAIF_LINK_HIGH_BANDW; | |
170 | common.flowctrl = NULL; | |
171 | ||
172 | link_support = cfusbl_create(dev->ifindex, dev->dev_addr, | |
173 | dev->broadcast); | |
174 | ||
175 | if (!link_support) | |
176 | return -ENOMEM; | |
177 | ||
178 | if (dev->num_tx_queues > 1) | |
179 | pr_warn("USB device uses more than one tx queue\n"); | |
180 | ||
7f5d8666 | 181 | res = caif_enroll_dev(dev, &common, link_support, CFUSB_MAX_HEADLEN, |
7ad65bf6 | 182 | &layer, &caif_usb_type.func); |
7f5d8666 PS |
183 | if (res) |
184 | goto err; | |
185 | ||
7ad65bf6 | 186 | if (!pack_added) |
187 | dev_add_pack(&caif_usb_type); | |
3db1cd5c | 188 | pack_added = true; |
7ad65bf6 | 189 | |
df207b00 | 190 | strscpy(layer->name, dev->name, sizeof(layer->name)); |
7ad65bf6 | 191 | |
192 | return 0; | |
7f5d8666 PS |
193 | err: |
194 | cfusbl_release(link_support); | |
195 | return res; | |
7ad65bf6 | 196 | } |
197 | ||
198 | static struct notifier_block caif_device_notifier = { | |
199 | .notifier_call = cfusbl_device_notify, | |
200 | .priority = 0, | |
201 | }; | |
202 | ||
203 | static int __init cfusbl_init(void) | |
204 | { | |
205 | return register_netdevice_notifier(&caif_device_notifier); | |
206 | } | |
207 | ||
208 | static void __exit cfusbl_exit(void) | |
209 | { | |
210 | unregister_netdevice_notifier(&caif_device_notifier); | |
211 | dev_remove_pack(&caif_usb_type); | |
212 | } | |
213 | ||
214 | module_init(cfusbl_init); | |
215 | module_exit(cfusbl_exit); |