1 // SPDX-License-Identifier: GPL-2.0-only
4  * Copyright (C) ST-Ericsson AB 2011
23 MODULE_DESCRIPTION("ST-Ericsson CAIF modem protocol USB support");
28 #define CFUSB_MAX_HEADLEN (CFUSB_PAD_DESCR_SZ + CFUSB_ALIGNMENT-1)
29 #define STE_USB_VID 0x04cc	/* USB Product ID for ST-Ericsson */
39 static int cfusbl_receive(struct cflayer *layr, struct cfpkt *pkt)  in cfusbl_receive()  argument
44 	cfpkt_extr_head(pkt, &hpad, 1);  in cfusbl_receive()
45 	cfpkt_extr_head(pkt, NULL, hpad);  in cfusbl_receive()
46 	return layr->up->receive(layr->up, pkt);  in cfusbl_receive()
49 static int cfusbl_transmit(struct cflayer *layr, struct cfpkt *pkt)  in cfusbl_transmit()  argument
57 	skb = cfpkt_tonative(pkt);  in cfusbl_transmit()
60 	skb->protocol = htons(ETH_P_IP);  in cfusbl_transmit()
62 	info = cfpkt_info(pkt);  in cfusbl_transmit()
63 	hpad = (info->hdr_len + CFUSB_PAD_DESCR_SZ) & (CFUSB_ALIGNMENT - 1);  in cfusbl_transmit()
68 		return -EIO;  in cfusbl_transmit()
72 	cfpkt_add_head(pkt, zeros, hpad);  in cfusbl_transmit()
73 	cfpkt_add_head(pkt, &hpad, 1);  in cfusbl_transmit()
74 	cfpkt_add_head(pkt, usbl->tx_eth_hdr, sizeof(usbl->tx_eth_hdr));  in cfusbl_transmit()
75 	return layr->dn->transmit(layr->dn, pkt);  in cfusbl_transmit()
81 	if (layr->up && layr->up->ctrlcmd)  in cfusbl_ctrlcmd()
82 		layr->up->ctrlcmd(layr->up, ctrl, layr->id);  in cfusbl_ctrlcmd()
95 	memset(&this->layer, 0, sizeof(this->layer));  in cfusbl_create()
96 	this->layer.receive = cfusbl_receive;  in cfusbl_create()
97 	this->layer.transmit = cfusbl_transmit;  in cfusbl_create()
98 	this->layer.ctrlcmd = cfusbl_ctrlcmd;  in cfusbl_create()
99 	snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "usb%d", phyid);  in cfusbl_create()
100 	this->layer.id = phyid;  in cfusbl_create()
103 	 * Construct TX ethernet header:  in cfusbl_create()
104 	 *	0-5	destination address  in cfusbl_create()
105 	 *	5-11	source address  in cfusbl_create()
106 	 *	12-13	protocol type  in cfusbl_create()
108 	ether_addr_copy(&this->tx_eth_hdr[ETH_ALEN], braddr);  in cfusbl_create()
109 	ether_addr_copy(&this->tx_eth_hdr[ETH_ALEN], ethaddr);  in cfusbl_create()
110 	this->tx_eth_hdr[12] = cpu_to_be16(ETH_P_802_EX1) & 0xff;  in cfusbl_create()
111 	this->tx_eth_hdr[13] = (cpu_to_be16(ETH_P_802_EX1) >> 8) & 0xff;  in cfusbl_create()
112 	pr_debug("caif ethernet TX-header dst:%pM src:%pM type:%02x%02x\n",  in cfusbl_create()
113 			this->tx_eth_hdr, this->tx_eth_hdr + ETH_ALEN,  in cfusbl_create()
114 			this->tx_eth_hdr[12], this->tx_eth_hdr[13]);  in cfusbl_create()
138 	if (what == NETDEV_UNREGISTER && dev->reg_state >= NETREG_UNREGISTERED)  in cfusbl_device_notify()
142 	if (!(dev->dev.parent && dev->dev.parent->driver &&  in cfusbl_device_notify()
143 	      strcmp(dev->dev.parent->driver->name, "cdc_ncm") == 0))  in cfusbl_device_notify()
147 	usbdev = usbnet->udev;  in cfusbl_device_notify()
150 		le16_to_cpu(usbdev->descriptor.idVendor),  in cfusbl_device_notify()
151 		le16_to_cpu(usbdev->descriptor.idProduct));  in cfusbl_device_notify()
154 	if (!(le16_to_cpu(usbdev->descriptor.idVendor) == STE_USB_VID &&  in cfusbl_device_notify()
155 		le16_to_cpu(usbdev->descriptor.idProduct) == STE_USB_PID_CAIF))  in cfusbl_device_notify()
173 	link_support = cfusbl_create(dev->ifindex, dev->dev_addr,  in cfusbl_device_notify()
174 					dev->broadcast);  in cfusbl_device_notify()
177 		return -ENOMEM;  in cfusbl_device_notify()
179 	if (dev->num_tx_queues > 1)  in cfusbl_device_notify()
180 		pr_warn("USB device uses more than one tx queue\n");  in cfusbl_device_notify()
191 	strscpy(layer->name, dev->name, sizeof(layer->name));  in cfusbl_device_notify()