[mirror_ubuntu-hirsute-kernel.git] / drivers / net / usb / kalmia.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * USB network interface driver for Samsung Kalmia based LTE USB modem like the
 * Samsung GT-B3730 and GT-B3710.
 *
 * Copyright (C) 2011 Marius Bjoernstad Kotsbak <marius@kotsbak.com>
 *
 * Sponsored by Quicklink Video Distribution Services Ltd.
 *
 * Based on the cdc_eem module.
 */

#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ctype.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/crc32.h>
#include <linux/usb/cdc.h>
#include <linux/usb/usbnet.h>
#include <linux/gfp.h>

/*
 * The Samsung Kalmia based LTE USB modems have a CDC ACM port for modem control
 * handled by the "option" module and an ethernet data port handled by this
 * module.
 *
 * The stick must first be switched into modem mode by usb_modeswitch
 * or similar tool. Then the modem gets sent two initialization packets by
 * this module, which gives the MAC address of the device. User space can then
 * connect the modem using AT commands through the ACM port and then use
 * DHCP on the network interface exposed by this module. Network packets are
 * sent to and from the modem in a proprietary format discovered after watching
 * the behavior of the windows driver for the modem.
 *
 * More information about the use of the modem is available in usb_modeswitch
 * forum and the project page:
 *
 * http://www.draisberghof.de/usb_modeswitch/bb/viewtopic.php?t=465
 * https://github.com/mkotsbak/Samsung-GT-B3730-linux-driver
 */

/* #define	DEBUG */
/* #define	VERBOSE */

#define KALMIA_HEADER_LENGTH 6
#define KALMIA_ALIGN_SIZE 4
#define KALMIA_USB_TIMEOUT 10000

/*-------------------------------------------------------------------------*/

static int
kalmia_send_init_packet(struct usbnet *dev, u8 *init_msg, u8 init_msg_len,
	u8 *buffer, u8 expected_len)
{
	int act_len;
	int status;

	netdev_dbg(dev->net, "Sending init packet");

	status = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 0x02),
		init_msg, init_msg_len, &act_len, KALMIA_USB_TIMEOUT);
	if (status != 0) {
		netdev_err(dev->net,
			"Error sending init packet. Status %i, length %i\n",
			status, act_len);
		return status;
	}
	else if (act_len != init_msg_len) {
		netdev_err(dev->net,
			"Did not send all of init packet. Bytes sent: %i",
			act_len);
	}
	else {
		netdev_dbg(dev->net, "Successfully sent init packet.");
	}

	status = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, 0x81),
		buffer, expected_len, &act_len, KALMIA_USB_TIMEOUT);

	if (status != 0)
		netdev_err(dev->net,
			"Error receiving init result. Status %i, length %i\n",
			status, act_len);
	else if (act_len != expected_len)
		netdev_err(dev->net, "Unexpected init result length: %i\n",
			act_len);

	return status;
}

static int
kalmia_init_and_get_ethernet_addr(struct usbnet *dev, u8 *ethernet_addr)
{
	static const char init_msg_1[] =
		{ 0x57, 0x50, 0x04, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00,
		0x00, 0x00 };
	static const char init_msg_2[] =
		{ 0x57, 0x50, 0x04, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0xf4,
		0x00, 0x00 };
	static const int buflen = 28;
	char *usb_buf;
	int status;

	usb_buf = kmalloc(buflen, GFP_DMA | GFP_KERNEL);
	if (!usb_buf)
		return -ENOMEM;

	memcpy(usb_buf, init_msg_1, 12);
	status = kalmia_send_init_packet(dev, usb_buf, ARRAY_SIZE(init_msg_1),
					 usb_buf, 24);
	if (status != 0)
		return status;

	memcpy(usb_buf, init_msg_2, 12);
	status = kalmia_send_init_packet(dev, usb_buf, ARRAY_SIZE(init_msg_2),
					 usb_buf, 28);
	if (status != 0)
		return status;

	memcpy(ethernet_addr, usb_buf + 10, ETH_ALEN);

	kfree(usb_buf);
	return status;
}

static int
kalmia_bind(struct usbnet *dev, struct usb_interface *intf)
{
	int status;
	u8 ethernet_addr[ETH_ALEN];

	/* Don't bind to AT command interface */
	if (intf->cur_altsetting->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
		return -EINVAL;

	dev->in = usb_rcvbulkpipe(dev->udev, 0x81 & USB_ENDPOINT_NUMBER_MASK);
	dev->out = usb_sndbulkpipe(dev->udev, 0x02 & USB_ENDPOINT_NUMBER_MASK);
	dev->status = NULL;

	dev->net->hard_header_len += KALMIA_HEADER_LENGTH;
	dev->hard_mtu = 1400;
	dev->rx_urb_size = dev->hard_mtu * 10; // Found as optimal after testing

	status = kalmia_init_and_get_ethernet_addr(dev, ethernet_addr);
	if (status)
		return status;

	memcpy(dev->net->dev_addr, ethernet_addr, ETH_ALEN);

	return status;
}

static struct sk_buff *
kalmia_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
	struct sk_buff *skb2 = NULL;
	u16 content_len;
	unsigned char *header_start;
	unsigned char ether_type_1, ether_type_2;
	u8 remainder, padlen = 0;

	if (!skb_cloned(skb)) {
		int headroom = skb_headroom(skb);
		int tailroom = skb_tailroom(skb);

		if ((tailroom >= KALMIA_ALIGN_SIZE) && (headroom
			>= KALMIA_HEADER_LENGTH))
			goto done;

		if ((headroom + tailroom) > (KALMIA_HEADER_LENGTH
			+ KALMIA_ALIGN_SIZE)) {
			skb->data = memmove(skb->head + KALMIA_HEADER_LENGTH,
				skb->data, skb->len);
			skb_set_tail_pointer(skb, skb->len);
			goto done;
		}
	}

	skb2 = skb_copy_expand(skb, KALMIA_HEADER_LENGTH,
		KALMIA_ALIGN_SIZE, flags);
	if (!skb2)
		return NULL;

	dev_kfree_skb_any(skb);
	skb = skb2;

done:
	header_start = skb_push(skb, KALMIA_HEADER_LENGTH);
	ether_type_1 = header_start[KALMIA_HEADER_LENGTH + 12];
	ether_type_2 = header_start[KALMIA_HEADER_LENGTH + 13];

	netdev_dbg(dev->net, "Sending etherType: %02x%02x", ether_type_1,
		ether_type_2);

	/* According to empiric data for data packages */
	header_start[0] = 0x57;
	header_start[1] = 0x44;
	content_len = skb->len - KALMIA_HEADER_LENGTH;

	put_unaligned_le16(content_len, &header_start[2]);
	header_start[4] = ether_type_1;
	header_start[5] = ether_type_2;

	/* Align to 4 bytes by padding with zeros */
	remainder = skb->len % KALMIA_ALIGN_SIZE;
	if (remainder > 0) {
		padlen = KALMIA_ALIGN_SIZE - remainder;
		skb_put_zero(skb, padlen);
	}

	netdev_dbg(dev->net,
		"Sending package with length %i and padding %i. Header: %6phC.",
		content_len, padlen, header_start);

	return skb;
}

static int
kalmia_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
	/*
	 * Our task here is to strip off framing, leaving skb with one
	 * data frame for the usbnet framework code to process.
	 */
	static const u8 HEADER_END_OF_USB_PACKET[] =
		{ 0x57, 0x5a, 0x00, 0x00, 0x08, 0x00 };
	static const u8 EXPECTED_UNKNOWN_HEADER_1[] =
		{ 0x57, 0x43, 0x1e, 0x00, 0x15, 0x02 };
	static const u8 EXPECTED_UNKNOWN_HEADER_2[] =
		{ 0x57, 0x50, 0x0e, 0x00, 0x00, 0x00 };
	int i = 0;

	/* incomplete header? */
	if (skb->len < KALMIA_HEADER_LENGTH)
		return 0;

	do {
		struct sk_buff *skb2 = NULL;
		u8 *header_start;
		u16 usb_packet_length, ether_packet_length;
		int is_last;

		header_start = skb->data;

		if (unlikely(header_start[0] != 0x57 || header_start[1] != 0x44)) {
			if (!memcmp(header_start, EXPECTED_UNKNOWN_HEADER_1,
				sizeof(EXPECTED_UNKNOWN_HEADER_1)) || !memcmp(
				header_start, EXPECTED_UNKNOWN_HEADER_2,
				sizeof(EXPECTED_UNKNOWN_HEADER_2))) {
				netdev_dbg(dev->net,
					"Received expected unknown frame header: %6phC. Package length: %i\n",
					header_start,
					skb->len - KALMIA_HEADER_LENGTH);
			}
			else {
				netdev_err(dev->net,
					"Received unknown frame header: %6phC. Package length: %i\n",
					header_start,
					skb->len - KALMIA_HEADER_LENGTH);
				return 0;
			}
		}
		else
			netdev_dbg(dev->net,
				"Received header: %6phC. Package length: %i\n",
				header_start, skb->len - KALMIA_HEADER_LENGTH);

		/* subtract start header and end header */
		usb_packet_length = skb->len - (2 * KALMIA_HEADER_LENGTH);
		ether_packet_length = get_unaligned_le16(&header_start[2]);
		skb_pull(skb, KALMIA_HEADER_LENGTH);

		/* Some small packets misses end marker */
		if (usb_packet_length < ether_packet_length) {
			ether_packet_length = usb_packet_length
				+ KALMIA_HEADER_LENGTH;
			is_last = true;
		}
		else {
			netdev_dbg(dev->net, "Correct package length #%i", i
				+ 1);

			is_last = (memcmp(skb->data + ether_packet_length,
				HEADER_END_OF_USB_PACKET,
				sizeof(HEADER_END_OF_USB_PACKET)) == 0);
			if (!is_last) {
				header_start = skb->data + ether_packet_length;
				netdev_dbg(dev->net,
					"End header: %6phC. Package length: %i\n",
					header_start,
					skb->len - KALMIA_HEADER_LENGTH);
			}
		}

		if (is_last) {
			skb2 = skb;
		}
		else {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (unlikely(!skb2))
				return 0;
		}

		skb_trim(skb2, ether_packet_length);

		if (is_last) {
			return 1;
		}
		else {
			usbnet_skb_return(dev, skb2);
			skb_pull(skb, ether_packet_length);
		}

		i++;
	}
	while (skb->len);

	return 1;
}

static const struct driver_info kalmia_info = {
	.description = "Samsung Kalmia LTE USB dongle",
	.flags = FLAG_WWAN,
	.bind = kalmia_bind,
	.rx_fixup = kalmia_rx_fixup,
	.tx_fixup = kalmia_tx_fixup
};

/*-------------------------------------------------------------------------*/

static const struct usb_device_id products[] = {
	/* The unswitched USB ID, to get the module auto loaded: */
	{ USB_DEVICE(0x04e8, 0x689a) },
	/* The stick switched into modem (by e.g. usb_modeswitch): */
	{ USB_DEVICE(0x04e8, 0x6889),
		.driver_info = (unsigned long) &kalmia_info, },
	{ /* EMPTY == end of list */} };
MODULE_DEVICE_TABLE( usb, products);

static struct usb_driver kalmia_driver = {
	.name = "kalmia",
	.id_table = products,
	.probe = usbnet_probe,
	.disconnect = usbnet_disconnect,
	.suspend = usbnet_suspend,
	.resume = usbnet_resume,
	.disable_hub_initiated_lpm = 1,
};

module_usb_driver(kalmia_driver);

MODULE_AUTHOR("Marius Bjoernstad Kotsbak <marius@kotsbak.com>");
MODULE_DESCRIPTION("Samsung Kalmia USB network driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
d4026123 MK	2	/*
	3	* USB network interface driver for Samsung Kalmia based LTE USB modem like the
	4	* Samsung GT-B3730 and GT-B3710.
	5	*
	6	* Copyright (C) 2011 Marius Bjoernstad Kotsbak <marius@kotsbak.com>
	7	*
	8	* Sponsored by Quicklink Video Distribution Services Ltd.
	9	*
	10	* Based on the cdc_eem module.
d4026123 MK	11	*/
	12
	13	#include <linux/module.h>
d4026123 MK	14	#include <linux/netdevice.h>
	15	#include <linux/etherdevice.h>
	16	#include <linux/ctype.h>
	17	#include <linux/ethtool.h>
	18	#include <linux/workqueue.h>
	19	#include <linux/mii.h>
	20	#include <linux/usb.h>
	21	#include <linux/crc32.h>
	22	#include <linux/usb/cdc.h>
	23	#include <linux/usb/usbnet.h>
	24	#include <linux/gfp.h>
	25
	26	/*
	27	* The Samsung Kalmia based LTE USB modems have a CDC ACM port for modem control
	28	* handled by the "option" module and an ethernet data port handled by this
	29	* module.
	30	*
	31	* The stick must first be switched into modem mode by usb_modeswitch
	32	* or similar tool. Then the modem gets sent two initialization packets by
	33	* this module, which gives the MAC address of the device. User space can then
	34	* connect the modem using AT commands through the ACM port and then use
	35	* DHCP on the network interface exposed by this module. Network packets are
	36	* sent to and from the modem in a proprietary format discovered after watching
	37	* the behavior of the windows driver for the modem.
	38	*
	39	* More information about the use of the modem is available in usb_modeswitch
	40	* forum and the project page:
	41	*
	42	* http://www.draisberghof.de/usb_modeswitch/bb/viewtopic.php?t=465
	43	* https://github.com/mkotsbak/Samsung-GT-B3730-linux-driver
	44	*/
	45
	46	/* #define DEBUG */
	47	/* #define VERBOSE */
	48
	49	#define KALMIA_HEADER_LENGTH 6
	50	#define KALMIA_ALIGN_SIZE 4
	51	#define KALMIA_USB_TIMEOUT 10000
	52
	53	/-------------------------------------------------------------------------/
	54
	55	static int
	56	kalmia_send_init_packet(struct usbnet dev, u8 init_msg, u8 init_msg_len,
	57	u8 *buffer, u8 expected_len)
	58	{
	59	int act_len;
	60	int status;
	61
	62	netdev_dbg(dev->net, "Sending init packet");
	63
	64	status = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 0x02),
	65	init_msg, init_msg_len, &act_len, KALMIA_USB_TIMEOUT);
	66	if (status != 0) {
	67	netdev_err(dev->net,
	68	"Error sending init packet. Status %i, length %i\n",
	69	status, act_len);
	70	return status;
	71	}
	72	else if (act_len != init_msg_len) {
	73	netdev_err(dev->net,
	74	"Did not send all of init packet. Bytes sent: %i",
	75	act_len);
	76	}
	77	else {
78	netdev_dbg(dev->net, "Successfully sent init packet.");
79	}
80
81	status = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, 0x81),
82	buffer, expected_len, &act_len, KALMIA_USB_TIMEOUT);
83
84	if (status != 0)
85	netdev_err(dev->net,
86	"Error receiving init result. Status %i, length %i\n",
87	status, act_len);
88	else if (act_len != expected_len)
89	netdev_err(dev->net, "Unexpected init result length: %i\n",
90	act_len);
91
92	return status;
93	}
94
95	static int
96	kalmia_init_and_get_ethernet_addr(struct usbnet dev, u8 ethernet_addr)
97	{
bd0d7aa6	98	static const char init_msg_1[] =
d4026123 MK	99	{ 0x57, 0x50, 0x04, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00,
d4026123 MK	100	0x00, 0x00 };
bd0d7aa6	101	static const char init_msg_2[] =
d4026123 MK	102	{ 0x57, 0x50, 0x04, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0xf4,
d4026123 MK	103	0x00, 0x00 };
bd0d7aa6	104	static const int buflen = 28;
7cdfa4a3	105	char *usb_buf;
d4026123 MK	106	int status;
d4026123 MK	107
7cdfa4a3 MK	108	usb_buf = kmalloc(buflen, GFP_DMA \| GFP_KERNEL);
	109	if (!usb_buf)
	110	return -ENOMEM;
	111
	112	memcpy(usb_buf, init_msg_1, 12);
b72c8a7e CIK	113	status = kalmia_send_init_packet(dev, usb_buf, ARRAY_SIZE(init_msg_1),
b72c8a7e CIK	114	usb_buf, 24);
d4026123 MK	115	if (status != 0)
	116	return status;
	117
7cdfa4a3	118	memcpy(usb_buf, init_msg_2, 12);
b72c8a7e CIK	119	status = kalmia_send_init_packet(dev, usb_buf, ARRAY_SIZE(init_msg_2),
b72c8a7e CIK	120	usb_buf, 28);
d4026123 MK	121	if (status != 0)
	122	return status;
	123
7cdfa4a3	124	memcpy(ethernet_addr, usb_buf + 10, ETH_ALEN);
d4026123	125
7cdfa4a3	126	kfree(usb_buf);
d4026123 MK	127	return status;
	128	}
	129
	130	static int
	131	kalmia_bind(struct usbnet dev, struct usb_interface intf)
	132	{
5c18e80b	133	int status;
d4026123 MK	134	u8 ethernet_addr[ETH_ALEN];
	135
	136	/* Don't bind to AT command interface */
	137	if (intf->cur_altsetting->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
	138	return -EINVAL;
	139
	140	dev->in = usb_rcvbulkpipe(dev->udev, 0x81 & USB_ENDPOINT_NUMBER_MASK);
	141	dev->out = usb_sndbulkpipe(dev->udev, 0x02 & USB_ENDPOINT_NUMBER_MASK);
	142	dev->status = NULL;
	143
	144	dev->net->hard_header_len += KALMIA_HEADER_LENGTH;
	145	dev->hard_mtu = 1400;
	146	dev->rx_urb_size = dev->hard_mtu * 10; // Found as optimal after testing
	147
	148	status = kalmia_init_and_get_ethernet_addr(dev, ethernet_addr);
4f06717f	149	if (status)
d4026123	150	return status;
d4026123 MK	151
d4026123 MK	152	memcpy(dev->net->dev_addr, ethernet_addr, ETH_ALEN);
d4026123 MK	153
	154	return status;
	155	}
	156
	157	static struct sk_buff *
	158	kalmia_tx_fixup(struct usbnet dev, struct sk_buff skb, gfp_t flags)
	159	{
	160	struct sk_buff *skb2 = NULL;
	161	u16 content_len;
	162	unsigned char *header_start;
	163	unsigned char ether_type_1, ether_type_2;
	164	u8 remainder, padlen = 0;
	165
	166	if (!skb_cloned(skb)) {
	167	int headroom = skb_headroom(skb);
	168	int tailroom = skb_tailroom(skb);
	169
	170	if ((tailroom >= KALMIA_ALIGN_SIZE) && (headroom
	171	>= KALMIA_HEADER_LENGTH))
	172	goto done;
	173
	174	if ((headroom + tailroom) > (KALMIA_HEADER_LENGTH
	175	+ KALMIA_ALIGN_SIZE)) {
	176	skb->data = memmove(skb->head + KALMIA_HEADER_LENGTH,
	177	skb->data, skb->len);
	178	skb_set_tail_pointer(skb, skb->len);
	179	goto done;
	180	}
	181	}
	182
	183	skb2 = skb_copy_expand(skb, KALMIA_HEADER_LENGTH,
	184	KALMIA_ALIGN_SIZE, flags);
	185	if (!skb2)
	186	return NULL;
	187
	188	dev_kfree_skb_any(skb);
	189	skb = skb2;
	190
7cdfa4a3 MK	191	done:
7cdfa4a3 MK	192	header_start = skb_push(skb, KALMIA_HEADER_LENGTH);
d4026123 MK	193	ether_type_1 = header_start[KALMIA_HEADER_LENGTH + 12];
	194	ether_type_2 = header_start[KALMIA_HEADER_LENGTH + 13];
	195
	196	netdev_dbg(dev->net, "Sending etherType: %02x%02x", ether_type_1,
	197	ether_type_2);
	198
	199	/* According to empiric data for data packages */
	200	header_start[0] = 0x57;
	201	header_start[1] = 0x44;
	202	content_len = skb->len - KALMIA_HEADER_LENGTH;
d4026123	203
7cdfa4a3	204	put_unaligned_le16(content_len, &header_start[2]);
d4026123 MK	205	header_start[4] = ether_type_1;
	206	header_start[5] = ether_type_2;
	207
	208	/* Align to 4 bytes by padding with zeros */
	209	remainder = skb->len % KALMIA_ALIGN_SIZE;
	210	if (remainder > 0) {
	211	padlen = KALMIA_ALIGN_SIZE - remainder;
b080db58	212	skb_put_zero(skb, padlen);
d4026123 MK	213	}
d4026123 MK	214
cbb963de AS	215	netdev_dbg(dev->net,
	216	"Sending package with length %i and padding %i. Header: %6phC.",
	217	content_len, padlen, header_start);
d4026123 MK	218
	219	return skb;
	220	}
	221
	222	static int
	223	kalmia_rx_fixup(struct usbnet dev, struct sk_buff skb)
	224	{
	225	/*
	226	* Our task here is to strip off framing, leaving skb with one
	227	* data frame for the usbnet framework code to process.
	228	*/
bd0d7aa6	229	static const u8 HEADER_END_OF_USB_PACKET[] =
d4026123	230	{ 0x57, 0x5a, 0x00, 0x00, 0x08, 0x00 };
bd0d7aa6	231	static const u8 EXPECTED_UNKNOWN_HEADER_1[] =
d4026123	232	{ 0x57, 0x43, 0x1e, 0x00, 0x15, 0x02 };
bd0d7aa6	233	static const u8 EXPECTED_UNKNOWN_HEADER_2[] =
d4026123	234	{ 0x57, 0x50, 0x0e, 0x00, 0x00, 0x00 };
7cdfa4a3	235	int i = 0;
d4026123 MK	236
	237	/* incomplete header? */
	238	if (skb->len < KALMIA_HEADER_LENGTH)
	239	return 0;
	240
	241	do {
	242	struct sk_buff *skb2 = NULL;
	243	u8 *header_start;
	244	u16 usb_packet_length, ether_packet_length;
	245	int is_last;
	246
	247	header_start = skb->data;
	248
	249	if (unlikely(header_start[0] != 0x57 \|\| header_start[1] != 0x44)) {
	250	if (!memcmp(header_start, EXPECTED_UNKNOWN_HEADER_1,
	251	sizeof(EXPECTED_UNKNOWN_HEADER_1)) \|\| !memcmp(
	252	header_start, EXPECTED_UNKNOWN_HEADER_2,
	253	sizeof(EXPECTED_UNKNOWN_HEADER_2))) {
cbb963de AS	254	netdev_dbg(dev->net,
	255	"Received expected unknown frame header: %6phC. Package length: %i\n",
	256	header_start,
d4026123 MK	257	skb->len - KALMIA_HEADER_LENGTH);
	258	}
	259	else {
cbb963de AS	260	netdev_err(dev->net,
	261	"Received unknown frame header: %6phC. Package length: %i\n",
	262	header_start,
d4026123 MK	263	skb->len - KALMIA_HEADER_LENGTH);
	264	return 0;
	265	}
	266	}
	267	else
cbb963de AS	268	netdev_dbg(dev->net,
	269	"Received header: %6phC. Package length: %i\n",
	270	header_start, skb->len - KALMIA_HEADER_LENGTH);
d4026123 MK	271
	272	/* subtract start header and end header */
	273	usb_packet_length = skb->len - (2 * KALMIA_HEADER_LENGTH);
7cdfa4a3	274	ether_packet_length = get_unaligned_le16(&header_start[2]);
d4026123 MK	275	skb_pull(skb, KALMIA_HEADER_LENGTH);
	276
	277	/* Some small packets misses end marker */
	278	if (usb_packet_length < ether_packet_length) {
	279	ether_packet_length = usb_packet_length
	280	+ KALMIA_HEADER_LENGTH;
	281	is_last = true;
	282	}
	283	else {
	284	netdev_dbg(dev->net, "Correct package length #%i", i
	285	+ 1);
	286
	287	is_last = (memcmp(skb->data + ether_packet_length,
	288	HEADER_END_OF_USB_PACKET,
	289	sizeof(HEADER_END_OF_USB_PACKET)) == 0);
	290	if (!is_last) {
	291	header_start = skb->data + ether_packet_length;
cbb963de AS	292	netdev_dbg(dev->net,
	293	"End header: %6phC. Package length: %i\n",
	294	header_start,
d4026123 MK	295	skb->len - KALMIA_HEADER_LENGTH);
	296	}
	297	}
	298
	299	if (is_last) {
	300	skb2 = skb;
	301	}
	302	else {
	303	skb2 = skb_clone(skb, GFP_ATOMIC);
	304	if (unlikely(!skb2))
	305	return 0;
	306	}
	307
	308	skb_trim(skb2, ether_packet_length);
	309
	310	if (is_last) {
	311	return 1;
	312	}
	313	else {
	314	usbnet_skb_return(dev, skb2);
	315	skb_pull(skb, ether_packet_length);
	316	}
	317
	318	i++;
	319	}
	320	while (skb->len);
	321
	322	return 1;
	323	}
	324
	325	static const struct driver_info kalmia_info = {
	326	.description = "Samsung Kalmia LTE USB dongle",
	327	.flags = FLAG_WWAN,
	328	.bind = kalmia_bind,
	329	.rx_fixup = kalmia_rx_fixup,
	330	.tx_fixup = kalmia_tx_fixup
	331	};
	332
	333	/-------------------------------------------------------------------------/
	334
	335	static const struct usb_device_id products[] = {
	336	/* The unswitched USB ID, to get the module auto loaded: */
	337	{ USB_DEVICE(0x04e8, 0x689a) },
08a7e621	338	/* The stick switched into modem (by e.g. usb_modeswitch): */
d4026123 MK	339	{ USB_DEVICE(0x04e8, 0x6889),
	340	.driver_info = (unsigned long) &kalmia_info, },
	341	{ /* EMPTY == end of list */} };
	342	MODULE_DEVICE_TABLE( usb, products);
	343
	344	static struct usb_driver kalmia_driver = {
	345	.name = "kalmia",
	346	.id_table = products,
	347	.probe = usbnet_probe,
	348	.disconnect = usbnet_disconnect,
	349	.suspend = usbnet_suspend,
e1f12eb6 SS	350	.resume = usbnet_resume,
e1f12eb6 SS	351	.disable_hub_initiated_lpm = 1,
d4026123 MK	352	};
d4026123 MK	353
d632eb1b	354	module_usb_driver(kalmia_driver);
d4026123 MK	355
	356	MODULE_AUTHOR("Marius Bjoernstad Kotsbak <marius@kotsbak.com>");
	357	MODULE_DESCRIPTION("Samsung Kalmia USB network driver");
	358	MODULE_LICENSE("GPL");