4 * Copyright (C) ST-Ericsson 2010-2012
5 * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
6 * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
8 * USB Host Driver for Network Control Model (NCM)
9 * http://www.usb.org/developers/devclass_docs/NCM10.zip
11 * The NCM encoding, decoding and initialization logic
12 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
14 * This software is available to you under a choice of one of two
15 * licenses. You may choose this file to be licensed under the terms
16 * of the GNU General Public License (GPL) Version 2 or the 2-clause
17 * BSD license listed below:
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 #include <linux/module.h>
42 #include <linux/init.h>
43 #include <linux/netdevice.h>
44 #include <linux/ctype.h>
45 #include <linux/ethtool.h>
46 #include <linux/workqueue.h>
47 #include <linux/mii.h>
48 #include <linux/crc32.h>
49 #include <linux/usb.h>
50 #include <linux/hrtimer.h>
51 #include <linux/atomic.h>
52 #include <linux/usb/usbnet.h>
53 #include <linux/usb/cdc.h>
54 #include <linux/usb/cdc_ncm.h>
56 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
57 static bool prefer_mbim
= true;
59 static bool prefer_mbim
;
61 module_param(prefer_mbim
, bool, S_IRUGO
| S_IWUSR
);
62 MODULE_PARM_DESC(prefer_mbim
, "Prefer MBIM setting on dual NCM/MBIM functions");
64 static void cdc_ncm_txpath_bh(unsigned long param
);
65 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx
*ctx
);
66 static enum hrtimer_restart
cdc_ncm_tx_timer_cb(struct hrtimer
*hr_timer
);
67 static struct usb_driver cdc_ncm_driver
;
69 static u8
cdc_ncm_setup(struct usbnet
*dev
)
71 struct cdc_ncm_ctx
*ctx
= (struct cdc_ncm_ctx
*)dev
->data
[0];
72 struct usb_cdc_ncm_ntb_parameters ncm_parm
;
78 u16 ntb_fmt_supported
;
79 __le16 max_datagram_size
;
81 iface_no
= ctx
->control
->cur_altsetting
->desc
.bInterfaceNumber
;
83 err
= usbnet_read_cmd(dev
, USB_CDC_GET_NTB_PARAMETERS
,
84 USB_TYPE_CLASS
| USB_DIR_IN
86 0, iface_no
, &ncm_parm
,
89 dev_err(&dev
->intf
->dev
, "failed GET_NTB_PARAMETERS\n");
90 return err
; /* GET_NTB_PARAMETERS is required */
93 /* read correct set of parameters according to device mode */
94 ctx
->rx_max
= le32_to_cpu(ncm_parm
.dwNtbInMaxSize
);
95 ctx
->tx_max
= le32_to_cpu(ncm_parm
.dwNtbOutMaxSize
);
96 ctx
->tx_remainder
= le16_to_cpu(ncm_parm
.wNdpOutPayloadRemainder
);
97 ctx
->tx_modulus
= le16_to_cpu(ncm_parm
.wNdpOutDivisor
);
98 ctx
->tx_ndp_modulus
= le16_to_cpu(ncm_parm
.wNdpOutAlignment
);
99 /* devices prior to NCM Errata shall set this field to zero */
100 ctx
->tx_max_datagrams
= le16_to_cpu(ncm_parm
.wNtbOutMaxDatagrams
);
101 ntb_fmt_supported
= le16_to_cpu(ncm_parm
.bmNtbFormatsSupported
);
103 /* there are some minor differences in NCM and MBIM defaults */
104 if (cdc_ncm_comm_intf_is_mbim(ctx
->control
->cur_altsetting
)) {
108 flags
= ctx
->mbim_desc
->bmNetworkCapabilities
;
109 ctx
->max_datagram_size
= le16_to_cpu(ctx
->mbim_desc
->wMaxSegmentSize
);
110 if (ctx
->max_datagram_size
< CDC_MBIM_MIN_DATAGRAM_SIZE
)
111 ctx
->max_datagram_size
= CDC_MBIM_MIN_DATAGRAM_SIZE
;
116 flags
= ctx
->func_desc
->bmNetworkCapabilities
;
117 ctx
->max_datagram_size
= le16_to_cpu(ctx
->ether_desc
->wMaxSegmentSize
);
118 if (ctx
->max_datagram_size
< CDC_NCM_MIN_DATAGRAM_SIZE
)
119 ctx
->max_datagram_size
= CDC_NCM_MIN_DATAGRAM_SIZE
;
122 /* common absolute max for NCM and MBIM */
123 if (ctx
->max_datagram_size
> CDC_NCM_MAX_DATAGRAM_SIZE
)
124 ctx
->max_datagram_size
= CDC_NCM_MAX_DATAGRAM_SIZE
;
126 dev_dbg(&dev
->intf
->dev
,
127 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
128 ctx
->rx_max
, ctx
->tx_max
, ctx
->tx_remainder
, ctx
->tx_modulus
,
129 ctx
->tx_ndp_modulus
, ctx
->tx_max_datagrams
, flags
);
131 /* max count of tx datagrams */
132 if ((ctx
->tx_max_datagrams
== 0) ||
133 (ctx
->tx_max_datagrams
> CDC_NCM_DPT_DATAGRAMS_MAX
))
134 ctx
->tx_max_datagrams
= CDC_NCM_DPT_DATAGRAMS_MAX
;
136 /* verify maximum size of received NTB in bytes */
137 if (ctx
->rx_max
< USB_CDC_NCM_NTB_MIN_IN_SIZE
) {
138 dev_dbg(&dev
->intf
->dev
, "Using min receive length=%d\n",
139 USB_CDC_NCM_NTB_MIN_IN_SIZE
);
140 ctx
->rx_max
= USB_CDC_NCM_NTB_MIN_IN_SIZE
;
143 if (ctx
->rx_max
> CDC_NCM_NTB_MAX_SIZE_RX
) {
144 dev_dbg(&dev
->intf
->dev
, "Using default maximum receive length=%d\n",
145 CDC_NCM_NTB_MAX_SIZE_RX
);
146 ctx
->rx_max
= CDC_NCM_NTB_MAX_SIZE_RX
;
149 /* inform device about NTB input size changes */
150 if (ctx
->rx_max
!= le32_to_cpu(ncm_parm
.dwNtbInMaxSize
)) {
151 __le32 dwNtbInMaxSize
= cpu_to_le32(ctx
->rx_max
);
153 err
= usbnet_write_cmd(dev
, USB_CDC_SET_NTB_INPUT_SIZE
,
154 USB_TYPE_CLASS
| USB_DIR_OUT
155 | USB_RECIP_INTERFACE
,
156 0, iface_no
, &dwNtbInMaxSize
, 4);
158 dev_dbg(&dev
->intf
->dev
, "Setting NTB Input Size failed\n");
161 /* verify maximum size of transmitted NTB in bytes */
162 if (ctx
->tx_max
> CDC_NCM_NTB_MAX_SIZE_TX
) {
163 dev_dbg(&dev
->intf
->dev
, "Using default maximum transmit length=%d\n",
164 CDC_NCM_NTB_MAX_SIZE_TX
);
165 ctx
->tx_max
= CDC_NCM_NTB_MAX_SIZE_TX
;
167 /* Adding a pad byte here simplifies the handling in
168 * cdc_ncm_fill_tx_frame, by making tx_max always
169 * represent the real skb max size.
171 if (ctx
->tx_max
% usb_maxpacket(dev
->udev
, dev
->out
, 1) == 0)
177 * verify that the structure alignment is:
179 * - not greater than the maximum transmit length
180 * - not less than four bytes
182 val
= ctx
->tx_ndp_modulus
;
184 if ((val
< USB_CDC_NCM_NDP_ALIGN_MIN_SIZE
) ||
185 (val
!= ((-val
) & val
)) || (val
>= ctx
->tx_max
)) {
186 dev_dbg(&dev
->intf
->dev
, "Using default alignment: 4 bytes\n");
187 ctx
->tx_ndp_modulus
= USB_CDC_NCM_NDP_ALIGN_MIN_SIZE
;
191 * verify that the payload alignment is:
193 * - not greater than the maximum transmit length
194 * - not less than four bytes
196 val
= ctx
->tx_modulus
;
198 if ((val
< USB_CDC_NCM_NDP_ALIGN_MIN_SIZE
) ||
199 (val
!= ((-val
) & val
)) || (val
>= ctx
->tx_max
)) {
200 dev_dbg(&dev
->intf
->dev
, "Using default transmit modulus: 4 bytes\n");
201 ctx
->tx_modulus
= USB_CDC_NCM_NDP_ALIGN_MIN_SIZE
;
204 /* verify the payload remainder */
205 if (ctx
->tx_remainder
>= ctx
->tx_modulus
) {
206 dev_dbg(&dev
->intf
->dev
, "Using default transmit remainder: 0 bytes\n");
207 ctx
->tx_remainder
= 0;
210 /* adjust TX-remainder according to NCM specification. */
211 ctx
->tx_remainder
= ((ctx
->tx_remainder
- eth_hlen
) &
212 (ctx
->tx_modulus
- 1));
214 /* additional configuration */
217 if (flags
& USB_CDC_NCM_NCAP_CRC_MODE
) {
218 err
= usbnet_write_cmd(dev
, USB_CDC_SET_CRC_MODE
,
219 USB_TYPE_CLASS
| USB_DIR_OUT
220 | USB_RECIP_INTERFACE
,
221 USB_CDC_NCM_CRC_NOT_APPENDED
,
224 dev_dbg(&dev
->intf
->dev
, "Setting CRC mode off failed\n");
227 /* set NTB format, if both formats are supported */
228 if (ntb_fmt_supported
& USB_CDC_NCM_NTH32_SIGN
) {
229 err
= usbnet_write_cmd(dev
, USB_CDC_SET_NTB_FORMAT
,
230 USB_TYPE_CLASS
| USB_DIR_OUT
231 | USB_RECIP_INTERFACE
,
232 USB_CDC_NCM_NTB16_FORMAT
,
235 dev_dbg(&dev
->intf
->dev
, "Setting NTB format to 16-bit failed\n");
238 /* inform the device about the selected Max Datagram Size */
239 if (!(flags
& USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE
))
242 /* read current mtu value from device */
243 err
= usbnet_read_cmd(dev
, USB_CDC_GET_MAX_DATAGRAM_SIZE
,
244 USB_TYPE_CLASS
| USB_DIR_IN
| USB_RECIP_INTERFACE
,
245 0, iface_no
, &max_datagram_size
, 2);
247 dev_dbg(&dev
->intf
->dev
, "GET_MAX_DATAGRAM_SIZE failed\n");
251 if (le16_to_cpu(max_datagram_size
) == ctx
->max_datagram_size
)
254 max_datagram_size
= cpu_to_le16(ctx
->max_datagram_size
);
255 err
= usbnet_write_cmd(dev
, USB_CDC_SET_MAX_DATAGRAM_SIZE
,
256 USB_TYPE_CLASS
| USB_DIR_OUT
| USB_RECIP_INTERFACE
,
257 0, iface_no
, &max_datagram_size
, 2);
259 dev_dbg(&dev
->intf
->dev
, "SET_MAX_DATAGRAM_SIZE failed\n");
262 /* set MTU to max supported by the device if necessary */
263 if (dev
->net
->mtu
> ctx
->max_datagram_size
- eth_hlen
)
264 dev
->net
->mtu
= ctx
->max_datagram_size
- eth_hlen
;
269 cdc_ncm_find_endpoints(struct usbnet
*dev
, struct usb_interface
*intf
)
271 struct usb_host_endpoint
*e
, *in
= NULL
, *out
= NULL
;
274 for (ep
= 0; ep
< intf
->cur_altsetting
->desc
.bNumEndpoints
; ep
++) {
276 e
= intf
->cur_altsetting
->endpoint
+ ep
;
277 switch (e
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) {
278 case USB_ENDPOINT_XFER_INT
:
279 if (usb_endpoint_dir_in(&e
->desc
)) {
285 case USB_ENDPOINT_XFER_BULK
:
286 if (usb_endpoint_dir_in(&e
->desc
)) {
300 dev
->in
= usb_rcvbulkpipe(dev
->udev
,
301 in
->desc
.bEndpointAddress
&
302 USB_ENDPOINT_NUMBER_MASK
);
303 if (out
&& !dev
->out
)
304 dev
->out
= usb_sndbulkpipe(dev
->udev
,
305 out
->desc
.bEndpointAddress
&
306 USB_ENDPOINT_NUMBER_MASK
);
309 static void cdc_ncm_free(struct cdc_ncm_ctx
*ctx
)
314 if (ctx
->tx_rem_skb
!= NULL
) {
315 dev_kfree_skb_any(ctx
->tx_rem_skb
);
316 ctx
->tx_rem_skb
= NULL
;
319 if (ctx
->tx_curr_skb
!= NULL
) {
320 dev_kfree_skb_any(ctx
->tx_curr_skb
);
321 ctx
->tx_curr_skb
= NULL
;
327 int cdc_ncm_bind_common(struct usbnet
*dev
, struct usb_interface
*intf
, u8 data_altsetting
)
329 const struct usb_cdc_union_desc
*union_desc
= NULL
;
330 struct cdc_ncm_ctx
*ctx
;
331 struct usb_driver
*driver
;
337 ctx
= kzalloc(sizeof(*ctx
), GFP_KERNEL
);
341 hrtimer_init(&ctx
->tx_timer
, CLOCK_MONOTONIC
, HRTIMER_MODE_REL
);
342 ctx
->tx_timer
.function
= &cdc_ncm_tx_timer_cb
;
343 ctx
->bh
.data
= (unsigned long)dev
;
344 ctx
->bh
.func
= cdc_ncm_txpath_bh
;
345 atomic_set(&ctx
->stop
, 0);
346 spin_lock_init(&ctx
->mtx
);
348 /* store ctx pointer in device data field */
349 dev
->data
[0] = (unsigned long)ctx
;
351 /* only the control interface can be successfully probed */
354 /* get some pointers */
355 driver
= driver_of(intf
);
356 buf
= intf
->cur_altsetting
->extra
;
357 len
= intf
->cur_altsetting
->extralen
;
359 /* parse through descriptors associated with control interface */
360 while ((len
> 0) && (buf
[0] > 2) && (buf
[0] <= len
)) {
362 if (buf
[1] != USB_DT_CS_INTERFACE
)
366 case USB_CDC_UNION_TYPE
:
367 if (buf
[0] < sizeof(*union_desc
))
370 union_desc
= (const struct usb_cdc_union_desc
*)buf
;
371 /* the master must be the interface we are probing */
372 if (intf
->cur_altsetting
->desc
.bInterfaceNumber
!=
373 union_desc
->bMasterInterface0
) {
374 dev_dbg(&intf
->dev
, "bogus CDC Union\n");
377 ctx
->data
= usb_ifnum_to_if(dev
->udev
,
378 union_desc
->bSlaveInterface0
);
381 case USB_CDC_ETHERNET_TYPE
:
382 if (buf
[0] < sizeof(*(ctx
->ether_desc
)))
386 (const struct usb_cdc_ether_desc
*)buf
;
389 case USB_CDC_NCM_TYPE
:
390 if (buf
[0] < sizeof(*(ctx
->func_desc
)))
393 ctx
->func_desc
= (const struct usb_cdc_ncm_desc
*)buf
;
396 case USB_CDC_MBIM_TYPE
:
397 if (buf
[0] < sizeof(*(ctx
->mbim_desc
)))
400 ctx
->mbim_desc
= (const struct usb_cdc_mbim_desc
*)buf
;
407 /* advance to next descriptor */
413 /* some buggy devices have an IAD but no CDC Union */
414 if (!union_desc
&& intf
->intf_assoc
&& intf
->intf_assoc
->bInterfaceCount
== 2) {
415 ctx
->data
= usb_ifnum_to_if(dev
->udev
, intf
->cur_altsetting
->desc
.bInterfaceNumber
+ 1);
416 dev_dbg(&intf
->dev
, "CDC Union missing - got slave from IAD\n");
419 /* check if we got everything */
420 if (!ctx
->data
|| (!ctx
->mbim_desc
&& !ctx
->ether_desc
)) {
421 dev_dbg(&intf
->dev
, "CDC descriptors missing\n");
425 /* claim data interface, if different from control */
426 if (ctx
->data
!= ctx
->control
) {
427 temp
= usb_driver_claim_interface(driver
, ctx
->data
, dev
);
429 dev_dbg(&intf
->dev
, "failed to claim data intf\n");
434 iface_no
= ctx
->data
->cur_altsetting
->desc
.bInterfaceNumber
;
436 /* reset data interface */
437 temp
= usb_set_interface(dev
->udev
, iface_no
, 0);
439 dev_dbg(&intf
->dev
, "set interface failed\n");
443 /* configure data interface */
444 temp
= usb_set_interface(dev
->udev
, iface_no
, data_altsetting
);
446 dev_dbg(&intf
->dev
, "set interface failed\n");
450 cdc_ncm_find_endpoints(dev
, ctx
->data
);
451 cdc_ncm_find_endpoints(dev
, ctx
->control
);
452 if (!dev
->in
|| !dev
->out
|| !dev
->status
) {
453 dev_dbg(&intf
->dev
, "failed to collect endpoints\n");
457 /* initialize data interface */
458 if (cdc_ncm_setup(dev
)) {
459 dev_dbg(&intf
->dev
, "cdc_ncm_setup() failed\n");
463 usb_set_intfdata(ctx
->data
, dev
);
464 usb_set_intfdata(ctx
->control
, dev
);
466 if (ctx
->ether_desc
) {
467 temp
= usbnet_get_ethernet_addr(dev
, ctx
->ether_desc
->iMACAddress
);
469 dev_dbg(&intf
->dev
, "failed to get mac address\n");
472 dev_info(&intf
->dev
, "MAC-Address: %pM\n", dev
->net
->dev_addr
);
475 /* usbnet use these values for sizing tx/rx queues */
476 dev
->hard_mtu
= ctx
->tx_max
;
477 dev
->rx_urb_size
= ctx
->rx_max
;
482 usb_set_intfdata(ctx
->control
, NULL
);
483 usb_set_intfdata(ctx
->data
, NULL
);
484 if (ctx
->data
!= ctx
->control
)
485 usb_driver_release_interface(driver
, ctx
->data
);
487 cdc_ncm_free((struct cdc_ncm_ctx
*)dev
->data
[0]);
489 dev_info(&intf
->dev
, "bind() failure\n");
492 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common
);
494 void cdc_ncm_unbind(struct usbnet
*dev
, struct usb_interface
*intf
)
496 struct cdc_ncm_ctx
*ctx
= (struct cdc_ncm_ctx
*)dev
->data
[0];
497 struct usb_driver
*driver
= driver_of(intf
);
500 return; /* no setup */
502 atomic_set(&ctx
->stop
, 1);
504 if (hrtimer_active(&ctx
->tx_timer
))
505 hrtimer_cancel(&ctx
->tx_timer
);
507 tasklet_kill(&ctx
->bh
);
509 /* handle devices with combined control and data interface */
510 if (ctx
->control
== ctx
->data
)
513 /* disconnect master --> disconnect slave */
514 if (intf
== ctx
->control
&& ctx
->data
) {
515 usb_set_intfdata(ctx
->data
, NULL
);
516 usb_driver_release_interface(driver
, ctx
->data
);
519 } else if (intf
== ctx
->data
&& ctx
->control
) {
520 usb_set_intfdata(ctx
->control
, NULL
);
521 usb_driver_release_interface(driver
, ctx
->control
);
525 usb_set_intfdata(intf
, NULL
);
528 EXPORT_SYMBOL_GPL(cdc_ncm_unbind
);
530 /* Select the MBIM altsetting iff it is preferred and available,
531 * returning the number of the corresponding data interface altsetting
533 u8
cdc_ncm_select_altsetting(struct usbnet
*dev
, struct usb_interface
*intf
)
535 struct usb_host_interface
*alt
;
537 /* The MBIM spec defines a NCM compatible default altsetting,
538 * which we may have matched:
540 * "Functions that implement both NCM 1.0 and MBIM (an
541 * “NCM/MBIM function”) according to this recommendation
542 * shall provide two alternate settings for the
543 * Communication Interface. Alternate setting 0, and the
544 * associated class and endpoint descriptors, shall be
545 * constructed according to the rules given for the
546 * Communication Interface in section 5 of [USBNCM10].
547 * Alternate setting 1, and the associated class and
548 * endpoint descriptors, shall be constructed according to
549 * the rules given in section 6 (USB Device Model) of this
552 if (prefer_mbim
&& intf
->num_altsetting
== 2) {
553 alt
= usb_altnum_to_altsetting(intf
, CDC_NCM_COMM_ALTSETTING_MBIM
);
554 if (alt
&& cdc_ncm_comm_intf_is_mbim(alt
) &&
555 !usb_set_interface(dev
->udev
,
556 intf
->cur_altsetting
->desc
.bInterfaceNumber
,
557 CDC_NCM_COMM_ALTSETTING_MBIM
))
558 return CDC_NCM_DATA_ALTSETTING_MBIM
;
560 return CDC_NCM_DATA_ALTSETTING_NCM
;
562 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting
);
564 static int cdc_ncm_bind(struct usbnet
*dev
, struct usb_interface
*intf
)
568 /* MBIM backwards compatible function? */
569 cdc_ncm_select_altsetting(dev
, intf
);
570 if (cdc_ncm_comm_intf_is_mbim(intf
->cur_altsetting
))
573 /* NCM data altsetting is always 1 */
574 ret
= cdc_ncm_bind_common(dev
, intf
, 1);
577 * We should get an event when network connection is "connected" or
578 * "disconnected". Set network connection in "disconnected" state
579 * (carrier is OFF) during attach, so the IP network stack does not
580 * start IPv6 negotiation and more.
582 usbnet_link_change(dev
, 0, 0);
586 static void cdc_ncm_align_tail(struct sk_buff
*skb
, size_t modulus
, size_t remainder
, size_t max
)
588 size_t align
= ALIGN(skb
->len
, modulus
) - skb
->len
+ remainder
;
590 if (skb
->len
+ align
> max
)
591 align
= max
- skb
->len
;
592 if (align
&& skb_tailroom(skb
) >= align
)
593 memset(skb_put(skb
, align
), 0, align
);
596 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
597 * allocating a new one within skb
599 static struct usb_cdc_ncm_ndp16
*cdc_ncm_ndp(struct cdc_ncm_ctx
*ctx
, struct sk_buff
*skb
, __le32 sign
, size_t reserve
)
601 struct usb_cdc_ncm_ndp16
*ndp16
= NULL
;
602 struct usb_cdc_ncm_nth16
*nth16
= (void *)skb
->data
;
603 size_t ndpoffset
= le16_to_cpu(nth16
->wNdpIndex
);
605 /* follow the chain of NDPs, looking for a match */
607 ndp16
= (struct usb_cdc_ncm_ndp16
*)(skb
->data
+ ndpoffset
);
608 if (ndp16
->dwSignature
== sign
)
610 ndpoffset
= le16_to_cpu(ndp16
->wNextNdpIndex
);
614 cdc_ncm_align_tail(skb
, ctx
->tx_ndp_modulus
, 0, ctx
->tx_max
);
616 /* verify that there is room for the NDP and the datagram (reserve) */
617 if ((ctx
->tx_max
- skb
->len
- reserve
) < CDC_NCM_NDP_SIZE
)
622 ndp16
->wNextNdpIndex
= cpu_to_le16(skb
->len
);
624 nth16
->wNdpIndex
= cpu_to_le16(skb
->len
);
626 /* push a new empty NDP */
627 ndp16
= (struct usb_cdc_ncm_ndp16
*)memset(skb_put(skb
, CDC_NCM_NDP_SIZE
), 0, CDC_NCM_NDP_SIZE
);
628 ndp16
->dwSignature
= sign
;
629 ndp16
->wLength
= cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16
) + sizeof(struct usb_cdc_ncm_dpe16
));
634 cdc_ncm_fill_tx_frame(struct usbnet
*dev
, struct sk_buff
*skb
, __le32 sign
)
636 struct cdc_ncm_ctx
*ctx
= (struct cdc_ncm_ctx
*)dev
->data
[0];
637 struct usb_cdc_ncm_nth16
*nth16
;
638 struct usb_cdc_ncm_ndp16
*ndp16
;
639 struct sk_buff
*skb_out
;
640 u16 n
= 0, index
, ndplen
;
643 /* if there is a remaining skb, it gets priority */
645 swap(skb
, ctx
->tx_rem_skb
);
646 swap(sign
, ctx
->tx_rem_sign
);
651 /* check if we are resuming an OUT skb */
652 skb_out
= ctx
->tx_curr_skb
;
654 /* allocate a new OUT skb */
656 skb_out
= alloc_skb(ctx
->tx_max
, GFP_ATOMIC
);
657 if (skb_out
== NULL
) {
659 dev_kfree_skb_any(skb
);
660 dev
->net
->stats
.tx_dropped
++;
664 /* fill out the initial 16-bit NTB header */
665 nth16
= (struct usb_cdc_ncm_nth16
*)memset(skb_put(skb_out
, sizeof(struct usb_cdc_ncm_nth16
)), 0, sizeof(struct usb_cdc_ncm_nth16
));
666 nth16
->dwSignature
= cpu_to_le32(USB_CDC_NCM_NTH16_SIGN
);
667 nth16
->wHeaderLength
= cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16
));
668 nth16
->wSequence
= cpu_to_le16(ctx
->tx_seq
++);
670 /* count total number of frames in this NTB */
671 ctx
->tx_curr_frame_num
= 0;
674 for (n
= ctx
->tx_curr_frame_num
; n
< ctx
->tx_max_datagrams
; n
++) {
675 /* send any remaining skb first */
677 skb
= ctx
->tx_rem_skb
;
678 sign
= ctx
->tx_rem_sign
;
679 ctx
->tx_rem_skb
= NULL
;
681 /* check for end of skb */
686 /* get the appropriate NDP for this skb */
687 ndp16
= cdc_ncm_ndp(ctx
, skb_out
, sign
, skb
->len
+ ctx
->tx_modulus
+ ctx
->tx_remainder
);
689 /* align beginning of next frame */
690 cdc_ncm_align_tail(skb_out
, ctx
->tx_modulus
, ctx
->tx_remainder
, ctx
->tx_max
);
692 /* check if we had enough room left for both NDP and frame */
693 if (!ndp16
|| skb_out
->len
+ skb
->len
> ctx
->tx_max
) {
695 /* won't fit, MTU problem? */
696 dev_kfree_skb_any(skb
);
698 dev
->net
->stats
.tx_dropped
++;
700 /* no room for skb - store for later */
701 if (ctx
->tx_rem_skb
!= NULL
) {
702 dev_kfree_skb_any(ctx
->tx_rem_skb
);
703 dev
->net
->stats
.tx_dropped
++;
705 ctx
->tx_rem_skb
= skb
;
706 ctx
->tx_rem_sign
= sign
;
713 /* calculate frame number withing this NDP */
714 ndplen
= le16_to_cpu(ndp16
->wLength
);
715 index
= (ndplen
- sizeof(struct usb_cdc_ncm_ndp16
)) / sizeof(struct usb_cdc_ncm_dpe16
) - 1;
717 /* OK, add this skb */
718 ndp16
->dpe16
[index
].wDatagramLength
= cpu_to_le16(skb
->len
);
719 ndp16
->dpe16
[index
].wDatagramIndex
= cpu_to_le16(skb_out
->len
);
720 ndp16
->wLength
= cpu_to_le16(ndplen
+ sizeof(struct usb_cdc_ncm_dpe16
));
721 memcpy(skb_put(skb_out
, skb
->len
), skb
->data
, skb
->len
);
722 dev_kfree_skb_any(skb
);
725 /* send now if this NDP is full */
726 if (index
>= CDC_NCM_DPT_DATAGRAMS_MAX
) {
732 /* free up any dangling skb */
734 dev_kfree_skb_any(skb
);
736 dev
->net
->stats
.tx_dropped
++;
739 ctx
->tx_curr_frame_num
= n
;
742 /* wait for more frames */
744 ctx
->tx_curr_skb
= skb_out
;
747 } else if ((n
< ctx
->tx_max_datagrams
) && (ready2send
== 0)) {
748 /* wait for more frames */
750 ctx
->tx_curr_skb
= skb_out
;
751 /* set the pending count */
752 if (n
< CDC_NCM_RESTART_TIMER_DATAGRAM_CNT
)
753 ctx
->tx_timer_pending
= CDC_NCM_TIMER_PENDING_CNT
;
758 /* variables will be reset at next call */
761 /* If collected data size is less or equal CDC_NCM_MIN_TX_PKT
762 * bytes, we send buffers as it is. If we get more data, it
763 * would be more efficient for USB HS mobile device with DMA
764 * engine to receive a full size NTB, than canceling DMA
765 * transfer and receiving a short packet.
767 * This optimization support is pointless if we end up sending
768 * a ZLP after full sized NTBs.
770 if (!(dev
->driver_info
->flags
& FLAG_SEND_ZLP
) &&
771 skb_out
->len
> CDC_NCM_MIN_TX_PKT
)
772 memset(skb_put(skb_out
, ctx
->tx_max
- skb_out
->len
), 0,
773 ctx
->tx_max
- skb_out
->len
);
774 else if ((skb_out
->len
% dev
->maxpacket
) == 0)
775 *skb_put(skb_out
, 1) = 0; /* force short packet */
777 /* set final frame length */
778 nth16
= (struct usb_cdc_ncm_nth16
*)skb_out
->data
;
779 nth16
->wBlockLength
= cpu_to_le16(skb_out
->len
);
782 ctx
->tx_curr_skb
= NULL
;
783 dev
->net
->stats
.tx_packets
+= ctx
->tx_curr_frame_num
;
787 /* Start timer, if there is a remaining skb */
788 if (ctx
->tx_curr_skb
!= NULL
)
789 cdc_ncm_tx_timeout_start(ctx
);
792 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame
);
794 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx
*ctx
)
796 /* start timer, if not already started */
797 if (!(hrtimer_active(&ctx
->tx_timer
) || atomic_read(&ctx
->stop
)))
798 hrtimer_start(&ctx
->tx_timer
,
799 ktime_set(0, CDC_NCM_TIMER_INTERVAL
),
803 static enum hrtimer_restart
cdc_ncm_tx_timer_cb(struct hrtimer
*timer
)
805 struct cdc_ncm_ctx
*ctx
=
806 container_of(timer
, struct cdc_ncm_ctx
, tx_timer
);
808 if (!atomic_read(&ctx
->stop
))
809 tasklet_schedule(&ctx
->bh
);
810 return HRTIMER_NORESTART
;
813 static void cdc_ncm_txpath_bh(unsigned long param
)
815 struct usbnet
*dev
= (struct usbnet
*)param
;
816 struct cdc_ncm_ctx
*ctx
= (struct cdc_ncm_ctx
*)dev
->data
[0];
818 spin_lock_bh(&ctx
->mtx
);
819 if (ctx
->tx_timer_pending
!= 0) {
820 ctx
->tx_timer_pending
--;
821 cdc_ncm_tx_timeout_start(ctx
);
822 spin_unlock_bh(&ctx
->mtx
);
823 } else if (dev
->net
!= NULL
) {
824 spin_unlock_bh(&ctx
->mtx
);
825 netif_tx_lock_bh(dev
->net
);
826 usbnet_start_xmit(NULL
, dev
->net
);
827 netif_tx_unlock_bh(dev
->net
);
829 spin_unlock_bh(&ctx
->mtx
);
834 cdc_ncm_tx_fixup(struct usbnet
*dev
, struct sk_buff
*skb
, gfp_t flags
)
836 struct sk_buff
*skb_out
;
837 struct cdc_ncm_ctx
*ctx
= (struct cdc_ncm_ctx
*)dev
->data
[0];
840 * The Ethernet API we are using does not support transmitting
841 * multiple Ethernet frames in a single call. This driver will
842 * accumulate multiple Ethernet frames and send out a larger
843 * USB frame when the USB buffer is full or when a single jiffies
849 spin_lock_bh(&ctx
->mtx
);
850 skb_out
= cdc_ncm_fill_tx_frame(dev
, skb
, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN
));
851 spin_unlock_bh(&ctx
->mtx
);
856 dev_kfree_skb_any(skb
);
860 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup
);
862 /* verify NTB header and return offset of first NDP, or negative error */
863 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx
*ctx
, struct sk_buff
*skb_in
)
865 struct usbnet
*dev
= netdev_priv(skb_in
->dev
);
866 struct usb_cdc_ncm_nth16
*nth16
;
873 if (skb_in
->len
< (sizeof(struct usb_cdc_ncm_nth16
) +
874 sizeof(struct usb_cdc_ncm_ndp16
))) {
875 netif_dbg(dev
, rx_err
, dev
->net
, "frame too short\n");
879 nth16
= (struct usb_cdc_ncm_nth16
*)skb_in
->data
;
881 if (nth16
->dwSignature
!= cpu_to_le32(USB_CDC_NCM_NTH16_SIGN
)) {
882 netif_dbg(dev
, rx_err
, dev
->net
,
883 "invalid NTH16 signature <%#010x>\n",
884 le32_to_cpu(nth16
->dwSignature
));
888 len
= le16_to_cpu(nth16
->wBlockLength
);
889 if (len
> ctx
->rx_max
) {
890 netif_dbg(dev
, rx_err
, dev
->net
,
891 "unsupported NTB block length %u/%u\n", len
,
896 if ((ctx
->rx_seq
+ 1) != le16_to_cpu(nth16
->wSequence
) &&
897 (ctx
->rx_seq
|| le16_to_cpu(nth16
->wSequence
)) &&
898 !((ctx
->rx_seq
== 0xffff) && !le16_to_cpu(nth16
->wSequence
))) {
899 netif_dbg(dev
, rx_err
, dev
->net
,
900 "sequence number glitch prev=%d curr=%d\n",
901 ctx
->rx_seq
, le16_to_cpu(nth16
->wSequence
));
903 ctx
->rx_seq
= le16_to_cpu(nth16
->wSequence
);
905 ret
= le16_to_cpu(nth16
->wNdpIndex
);
909 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16
);
911 /* verify NDP header and return number of datagrams, or negative error */
912 int cdc_ncm_rx_verify_ndp16(struct sk_buff
*skb_in
, int ndpoffset
)
914 struct usbnet
*dev
= netdev_priv(skb_in
->dev
);
915 struct usb_cdc_ncm_ndp16
*ndp16
;
918 if ((ndpoffset
+ sizeof(struct usb_cdc_ncm_ndp16
)) > skb_in
->len
) {
919 netif_dbg(dev
, rx_err
, dev
->net
, "invalid NDP offset <%u>\n",
923 ndp16
= (struct usb_cdc_ncm_ndp16
*)(skb_in
->data
+ ndpoffset
);
925 if (le16_to_cpu(ndp16
->wLength
) < USB_CDC_NCM_NDP16_LENGTH_MIN
) {
926 netif_dbg(dev
, rx_err
, dev
->net
, "invalid DPT16 length <%u>\n",
927 le16_to_cpu(ndp16
->wLength
));
931 ret
= ((le16_to_cpu(ndp16
->wLength
) -
932 sizeof(struct usb_cdc_ncm_ndp16
)) /
933 sizeof(struct usb_cdc_ncm_dpe16
));
934 ret
--; /* we process NDP entries except for the last one */
936 if ((sizeof(struct usb_cdc_ncm_ndp16
) +
937 ret
* (sizeof(struct usb_cdc_ncm_dpe16
))) > skb_in
->len
) {
938 netif_dbg(dev
, rx_err
, dev
->net
, "Invalid nframes = %d\n", ret
);
945 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16
);
947 int cdc_ncm_rx_fixup(struct usbnet
*dev
, struct sk_buff
*skb_in
)
950 struct cdc_ncm_ctx
*ctx
= (struct cdc_ncm_ctx
*)dev
->data
[0];
955 struct usb_cdc_ncm_ndp16
*ndp16
;
956 struct usb_cdc_ncm_dpe16
*dpe16
;
958 int loopcount
= 50; /* arbitrary max preventing infinite loop */
960 ndpoffset
= cdc_ncm_rx_verify_nth16(ctx
, skb_in
);
965 nframes
= cdc_ncm_rx_verify_ndp16(skb_in
, ndpoffset
);
969 ndp16
= (struct usb_cdc_ncm_ndp16
*)(skb_in
->data
+ ndpoffset
);
971 if (ndp16
->dwSignature
!= cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN
)) {
972 netif_dbg(dev
, rx_err
, dev
->net
,
973 "invalid DPT16 signature <%#010x>\n",
974 le32_to_cpu(ndp16
->dwSignature
));
977 dpe16
= ndp16
->dpe16
;
979 for (x
= 0; x
< nframes
; x
++, dpe16
++) {
980 offset
= le16_to_cpu(dpe16
->wDatagramIndex
);
981 len
= le16_to_cpu(dpe16
->wDatagramLength
);
985 * All entries after first NULL entry are to be ignored
987 if ((offset
== 0) || (len
== 0)) {
989 goto err_ndp
; /* empty NTB */
993 /* sanity checking */
994 if (((offset
+ len
) > skb_in
->len
) ||
995 (len
> ctx
->rx_max
) || (len
< ETH_HLEN
)) {
996 netif_dbg(dev
, rx_err
, dev
->net
,
997 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
998 x
, offset
, len
, skb_in
);
1004 skb
= skb_clone(skb_in
, GFP_ATOMIC
);
1008 skb
->data
= ((u8
*)skb_in
->data
) + offset
;
1009 skb_set_tail_pointer(skb
, len
);
1010 usbnet_skb_return(dev
, skb
);
1014 /* are there more NDPs to process? */
1015 ndpoffset
= le16_to_cpu(ndp16
->wNextNdpIndex
);
1016 if (ndpoffset
&& loopcount
--)
1023 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup
);
1026 cdc_ncm_speed_change(struct usbnet
*dev
,
1027 struct usb_cdc_speed_change
*data
)
1029 uint32_t rx_speed
= le32_to_cpu(data
->DLBitRRate
);
1030 uint32_t tx_speed
= le32_to_cpu(data
->ULBitRate
);
1033 * Currently the USB-NET API does not support reporting the actual
1034 * device speed. Do print it instead.
1036 if ((tx_speed
> 1000000) && (rx_speed
> 1000000)) {
1037 netif_info(dev
, link
, dev
->net
,
1038 "%u mbit/s downlink %u mbit/s uplink\n",
1039 (unsigned int)(rx_speed
/ 1000000U),
1040 (unsigned int)(tx_speed
/ 1000000U));
1042 netif_info(dev
, link
, dev
->net
,
1043 "%u kbit/s downlink %u kbit/s uplink\n",
1044 (unsigned int)(rx_speed
/ 1000U),
1045 (unsigned int)(tx_speed
/ 1000U));
1049 static void cdc_ncm_status(struct usbnet
*dev
, struct urb
*urb
)
1051 struct cdc_ncm_ctx
*ctx
;
1052 struct usb_cdc_notification
*event
;
1054 ctx
= (struct cdc_ncm_ctx
*)dev
->data
[0];
1056 if (urb
->actual_length
< sizeof(*event
))
1059 /* test for split data in 8-byte chunks */
1060 if (test_and_clear_bit(EVENT_STS_SPLIT
, &dev
->flags
)) {
1061 cdc_ncm_speed_change(dev
,
1062 (struct usb_cdc_speed_change
*)urb
->transfer_buffer
);
1066 event
= urb
->transfer_buffer
;
1068 switch (event
->bNotificationType
) {
1069 case USB_CDC_NOTIFY_NETWORK_CONNECTION
:
1071 * According to the CDC NCM specification ch.7.1
1072 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1073 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1075 ctx
->connected
= le16_to_cpu(event
->wValue
);
1076 netif_info(dev
, link
, dev
->net
,
1077 "network connection: %sconnected\n",
1078 ctx
->connected
? "" : "dis");
1079 usbnet_link_change(dev
, ctx
->connected
, 0);
1082 case USB_CDC_NOTIFY_SPEED_CHANGE
:
1083 if (urb
->actual_length
< (sizeof(*event
) +
1084 sizeof(struct usb_cdc_speed_change
)))
1085 set_bit(EVENT_STS_SPLIT
, &dev
->flags
);
1087 cdc_ncm_speed_change(dev
,
1088 (struct usb_cdc_speed_change
*)&event
[1]);
1092 dev_dbg(&dev
->udev
->dev
,
1093 "NCM: unexpected notification 0x%02x!\n",
1094 event
->bNotificationType
);
1099 static int cdc_ncm_check_connect(struct usbnet
*dev
)
1101 struct cdc_ncm_ctx
*ctx
;
1103 ctx
= (struct cdc_ncm_ctx
*)dev
->data
[0];
1105 return 1; /* disconnected */
1107 return !ctx
->connected
;
1110 static const struct driver_info cdc_ncm_info
= {
1111 .description
= "CDC NCM",
1112 .flags
= FLAG_POINTTOPOINT
| FLAG_NO_SETINT
| FLAG_MULTI_PACKET
,
1113 .bind
= cdc_ncm_bind
,
1114 .unbind
= cdc_ncm_unbind
,
1115 .check_connect
= cdc_ncm_check_connect
,
1116 .manage_power
= usbnet_manage_power
,
1117 .status
= cdc_ncm_status
,
1118 .rx_fixup
= cdc_ncm_rx_fixup
,
1119 .tx_fixup
= cdc_ncm_tx_fixup
,
1122 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1123 static const struct driver_info wwan_info
= {
1124 .description
= "Mobile Broadband Network Device",
1125 .flags
= FLAG_POINTTOPOINT
| FLAG_NO_SETINT
| FLAG_MULTI_PACKET
1127 .bind
= cdc_ncm_bind
,
1128 .unbind
= cdc_ncm_unbind
,
1129 .check_connect
= cdc_ncm_check_connect
,
1130 .manage_power
= usbnet_manage_power
,
1131 .status
= cdc_ncm_status
,
1132 .rx_fixup
= cdc_ncm_rx_fixup
,
1133 .tx_fixup
= cdc_ncm_tx_fixup
,
1136 /* Same as wwan_info, but with FLAG_NOARP */
1137 static const struct driver_info wwan_noarp_info
= {
1138 .description
= "Mobile Broadband Network Device (NO ARP)",
1139 .flags
= FLAG_POINTTOPOINT
| FLAG_NO_SETINT
| FLAG_MULTI_PACKET
1140 | FLAG_WWAN
| FLAG_NOARP
,
1141 .bind
= cdc_ncm_bind
,
1142 .unbind
= cdc_ncm_unbind
,
1143 .check_connect
= cdc_ncm_check_connect
,
1144 .manage_power
= usbnet_manage_power
,
1145 .status
= cdc_ncm_status
,
1146 .rx_fixup
= cdc_ncm_rx_fixup
,
1147 .tx_fixup
= cdc_ncm_tx_fixup
,
1150 static const struct usb_device_id cdc_devs
[] = {
1151 /* Ericsson MBM devices like F5521gw */
1152 { .match_flags
= USB_DEVICE_ID_MATCH_INT_INFO
1153 | USB_DEVICE_ID_MATCH_VENDOR
,
1155 .bInterfaceClass
= USB_CLASS_COMM
,
1156 .bInterfaceSubClass
= USB_CDC_SUBCLASS_NCM
,
1157 .bInterfaceProtocol
= USB_CDC_PROTO_NONE
,
1158 .driver_info
= (unsigned long) &wwan_info
,
1161 /* Dell branded MBM devices like DW5550 */
1162 { .match_flags
= USB_DEVICE_ID_MATCH_INT_INFO
1163 | USB_DEVICE_ID_MATCH_VENDOR
,
1165 .bInterfaceClass
= USB_CLASS_COMM
,
1166 .bInterfaceSubClass
= USB_CDC_SUBCLASS_NCM
,
1167 .bInterfaceProtocol
= USB_CDC_PROTO_NONE
,
1168 .driver_info
= (unsigned long) &wwan_info
,
1171 /* Toshiba branded MBM devices */
1172 { .match_flags
= USB_DEVICE_ID_MATCH_INT_INFO
1173 | USB_DEVICE_ID_MATCH_VENDOR
,
1175 .bInterfaceClass
= USB_CLASS_COMM
,
1176 .bInterfaceSubClass
= USB_CDC_SUBCLASS_NCM
,
1177 .bInterfaceProtocol
= USB_CDC_PROTO_NONE
,
1178 .driver_info
= (unsigned long) &wwan_info
,
1181 /* tag Huawei devices as wwan */
1182 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1184 USB_CDC_SUBCLASS_NCM
,
1185 USB_CDC_PROTO_NONE
),
1186 .driver_info
= (unsigned long)&wwan_info
,
1189 /* Infineon(now Intel) HSPA Modem platform */
1190 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1192 USB_CDC_SUBCLASS_NCM
, USB_CDC_PROTO_NONE
),
1193 .driver_info
= (unsigned long)&wwan_noarp_info
,
1196 /* Generic CDC-NCM devices */
1197 { USB_INTERFACE_INFO(USB_CLASS_COMM
,
1198 USB_CDC_SUBCLASS_NCM
, USB_CDC_PROTO_NONE
),
1199 .driver_info
= (unsigned long)&cdc_ncm_info
,
1204 MODULE_DEVICE_TABLE(usb
, cdc_devs
);
1206 static struct usb_driver cdc_ncm_driver
= {
1208 .id_table
= cdc_devs
,
1209 .probe
= usbnet_probe
,
1210 .disconnect
= usbnet_disconnect
,
1211 .suspend
= usbnet_suspend
,
1212 .resume
= usbnet_resume
,
1213 .reset_resume
= usbnet_resume
,
1214 .supports_autosuspend
= 1,
1215 .disable_hub_initiated_lpm
= 1,
1218 module_usb_driver(cdc_ncm_driver
);
1220 MODULE_AUTHOR("Hans Petter Selasky");
1221 MODULE_DESCRIPTION("USB CDC NCM host driver");
1222 MODULE_LICENSE("Dual BSD/GPL");