linux/drivers/usb/gadget/f_ecm.c
Christoph Egger 90f7976880 USB: Remove unsupported usb gadget drivers
A bunch of USB gadget drivers where never ported from the linux 2.4
series to 2.6 kernels. However there's some code still in the tree for
them which isn't used and is probably untested for ages.

As the chance of these drivers being forward ported is probably quite
small now it might be time to get rid of them.

Signed-off-by: Christoph Egger <siccegge@stud.informatik.uni-erlangen.de>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-03-02 14:54:57 -08:00

829 lines
23 KiB
C

/*
* f_ecm.c -- USB CDC Ethernet (ECM) link function driver
*
* Copyright (C) 2003-2005,2008 David Brownell
* Copyright (C) 2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* #define VERBOSE_DEBUG */
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include "u_ether.h"
/*
* This function is a "CDC Ethernet Networking Control Model" (CDC ECM)
* Ethernet link. The data transfer model is simple (packets sent and
* received over bulk endpoints using normal short packet termination),
* and the control model exposes various data and optional notifications.
*
* ECM is well standardized and (except for Microsoft) supported by most
* operating systems with USB host support. It's the preferred interop
* solution for Ethernet over USB, at least for firmware based solutions.
* (Hardware solutions tend to be more minimalist.) A newer and simpler
* "Ethernet Emulation Model" (CDC EEM) hasn't yet caught on.
*
* Note that ECM requires the use of "alternate settings" for its data
* interface. This means that the set_alt() method has real work to do,
* and also means that a get_alt() method is required.
*/
struct ecm_ep_descs {
struct usb_endpoint_descriptor *in;
struct usb_endpoint_descriptor *out;
struct usb_endpoint_descriptor *notify;
};
enum ecm_notify_state {
ECM_NOTIFY_NONE, /* don't notify */
ECM_NOTIFY_CONNECT, /* issue CONNECT next */
ECM_NOTIFY_SPEED, /* issue SPEED_CHANGE next */
};
struct f_ecm {
struct gether port;
u8 ctrl_id, data_id;
char ethaddr[14];
struct ecm_ep_descs fs;
struct ecm_ep_descs hs;
struct usb_ep *notify;
struct usb_endpoint_descriptor *notify_desc;
struct usb_request *notify_req;
u8 notify_state;
bool is_open;
/* FIXME is_open needs some irq-ish locking
* ... possibly the same as port.ioport
*/
};
static inline struct f_ecm *func_to_ecm(struct usb_function *f)
{
return container_of(f, struct f_ecm, port.func);
}
/* peak (theoretical) bulk transfer rate in bits-per-second */
static inline unsigned ecm_bitrate(struct usb_gadget *g)
{
if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
return 13 * 512 * 8 * 1000 * 8;
else
return 19 * 64 * 1 * 1000 * 8;
}
/*-------------------------------------------------------------------------*/
/*
* Include the status endpoint if we can, even though it's optional.
*
* Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
* packet, to simplify cancellation; and a big transfer interval, to
* waste less bandwidth.
*
* Some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even
* if they ignore the connect/disconnect notifications that real aether
* can provide. More advanced cdc configurations might want to support
* encapsulated commands (vendor-specific, using control-OUT).
*/
#define LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */
#define ECM_STATUS_BYTECOUNT 16 /* 8 byte header + data */
/* interface descriptor: */
static struct usb_interface_descriptor ecm_control_intf __initdata = {
.bLength = sizeof ecm_control_intf,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
/* status endpoint is optional; this could be patched later */
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET,
.bInterfaceProtocol = USB_CDC_PROTO_NONE,
/* .iInterface = DYNAMIC */
};
static struct usb_cdc_header_desc ecm_header_desc __initdata = {
.bLength = sizeof ecm_header_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = cpu_to_le16(0x0110),
};
static struct usb_cdc_union_desc ecm_union_desc __initdata = {
.bLength = sizeof(ecm_union_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
/* .bMasterInterface0 = DYNAMIC */
/* .bSlaveInterface0 = DYNAMIC */
};
static struct usb_cdc_ether_desc ecm_desc __initdata = {
.bLength = sizeof ecm_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
/* this descriptor actually adds value, surprise! */
/* .iMACAddress = DYNAMIC */
.bmEthernetStatistics = cpu_to_le32(0), /* no statistics */
.wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN),
.wNumberMCFilters = cpu_to_le16(0),
.bNumberPowerFilters = 0,
};
/* the default data interface has no endpoints ... */
static struct usb_interface_descriptor ecm_data_nop_intf __initdata = {
.bLength = sizeof ecm_data_nop_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
/* .iInterface = DYNAMIC */
};
/* ... but the "real" data interface has two bulk endpoints */
static struct usb_interface_descriptor ecm_data_intf __initdata = {
.bLength = sizeof ecm_data_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 1,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
/* .iInterface = DYNAMIC */
};
/* full speed support: */
static struct usb_endpoint_descriptor fs_ecm_notify_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(ECM_STATUS_BYTECOUNT),
.bInterval = 1 << LOG2_STATUS_INTERVAL_MSEC,
};
static struct usb_endpoint_descriptor fs_ecm_in_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor fs_ecm_out_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_descriptor_header *ecm_fs_function[] __initdata = {
/* CDC ECM control descriptors */
(struct usb_descriptor_header *) &ecm_control_intf,
(struct usb_descriptor_header *) &ecm_header_desc,
(struct usb_descriptor_header *) &ecm_union_desc,
(struct usb_descriptor_header *) &ecm_desc,
/* NOTE: status endpoint might need to be removed */
(struct usb_descriptor_header *) &fs_ecm_notify_desc,
/* data interface, altsettings 0 and 1 */
(struct usb_descriptor_header *) &ecm_data_nop_intf,
(struct usb_descriptor_header *) &ecm_data_intf,
(struct usb_descriptor_header *) &fs_ecm_in_desc,
(struct usb_descriptor_header *) &fs_ecm_out_desc,
NULL,
};
/* high speed support: */
static struct usb_endpoint_descriptor hs_ecm_notify_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(ECM_STATUS_BYTECOUNT),
.bInterval = LOG2_STATUS_INTERVAL_MSEC + 4,
};
static struct usb_endpoint_descriptor hs_ecm_in_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_endpoint_descriptor hs_ecm_out_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_descriptor_header *ecm_hs_function[] __initdata = {
/* CDC ECM control descriptors */
(struct usb_descriptor_header *) &ecm_control_intf,
(struct usb_descriptor_header *) &ecm_header_desc,
(struct usb_descriptor_header *) &ecm_union_desc,
(struct usb_descriptor_header *) &ecm_desc,
/* NOTE: status endpoint might need to be removed */
(struct usb_descriptor_header *) &hs_ecm_notify_desc,
/* data interface, altsettings 0 and 1 */
(struct usb_descriptor_header *) &ecm_data_nop_intf,
(struct usb_descriptor_header *) &ecm_data_intf,
(struct usb_descriptor_header *) &hs_ecm_in_desc,
(struct usb_descriptor_header *) &hs_ecm_out_desc,
NULL,
};
/* string descriptors: */
static struct usb_string ecm_string_defs[] = {
[0].s = "CDC Ethernet Control Model (ECM)",
[1].s = NULL /* DYNAMIC */,
[2].s = "CDC Ethernet Data",
{ } /* end of list */
};
static struct usb_gadget_strings ecm_string_table = {
.language = 0x0409, /* en-us */
.strings = ecm_string_defs,
};
static struct usb_gadget_strings *ecm_strings[] = {
&ecm_string_table,
NULL,
};
/*-------------------------------------------------------------------------*/
static void ecm_do_notify(struct f_ecm *ecm)
{
struct usb_request *req = ecm->notify_req;
struct usb_cdc_notification *event;
struct usb_composite_dev *cdev = ecm->port.func.config->cdev;
__le32 *data;
int status;
/* notification already in flight? */
if (!req)
return;
event = req->buf;
switch (ecm->notify_state) {
case ECM_NOTIFY_NONE:
return;
case ECM_NOTIFY_CONNECT:
event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
if (ecm->is_open)
event->wValue = cpu_to_le16(1);
else
event->wValue = cpu_to_le16(0);
event->wLength = 0;
req->length = sizeof *event;
DBG(cdev, "notify connect %s\n",
ecm->is_open ? "true" : "false");
ecm->notify_state = ECM_NOTIFY_SPEED;
break;
case ECM_NOTIFY_SPEED:
event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
event->wValue = cpu_to_le16(0);
event->wLength = cpu_to_le16(8);
req->length = ECM_STATUS_BYTECOUNT;
/* SPEED_CHANGE data is up/down speeds in bits/sec */
data = req->buf + sizeof *event;
data[0] = cpu_to_le32(ecm_bitrate(cdev->gadget));
data[1] = data[0];
DBG(cdev, "notify speed %d\n", ecm_bitrate(cdev->gadget));
ecm->notify_state = ECM_NOTIFY_NONE;
break;
}
event->bmRequestType = 0xA1;
event->wIndex = cpu_to_le16(ecm->ctrl_id);
ecm->notify_req = NULL;
status = usb_ep_queue(ecm->notify, req, GFP_ATOMIC);
if (status < 0) {
ecm->notify_req = req;
DBG(cdev, "notify --> %d\n", status);
}
}
static void ecm_notify(struct f_ecm *ecm)
{
/* NOTE on most versions of Linux, host side cdc-ethernet
* won't listen for notifications until its netdevice opens.
* The first notification then sits in the FIFO for a long
* time, and the second one is queued.
*/
ecm->notify_state = ECM_NOTIFY_CONNECT;
ecm_do_notify(ecm);
}
static void ecm_notify_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_ecm *ecm = req->context;
struct usb_composite_dev *cdev = ecm->port.func.config->cdev;
struct usb_cdc_notification *event = req->buf;
switch (req->status) {
case 0:
/* no fault */
break;
case -ECONNRESET:
case -ESHUTDOWN:
ecm->notify_state = ECM_NOTIFY_NONE;
break;
default:
DBG(cdev, "event %02x --> %d\n",
event->bNotificationType, req->status);
break;
}
ecm->notify_req = req;
ecm_do_notify(ecm);
}
static int ecm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
{
struct f_ecm *ecm = func_to_ecm(f);
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = cdev->req;
int value = -EOPNOTSUPP;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
/* composite driver infrastructure handles everything except
* CDC class messages; interface activation uses set_alt().
*/
switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_SET_ETHERNET_PACKET_FILTER:
/* see 6.2.30: no data, wIndex = interface,
* wValue = packet filter bitmap
*/
if (w_length != 0 || w_index != ecm->ctrl_id)
goto invalid;
DBG(cdev, "packet filter %02x\n", w_value);
/* REVISIT locking of cdc_filter. This assumes the UDC
* driver won't have a concurrent packet TX irq running on
* another CPU; or that if it does, this write is atomic...
*/
ecm->port.cdc_filter = w_value;
value = 0;
break;
/* and optionally:
* case USB_CDC_SEND_ENCAPSULATED_COMMAND:
* case USB_CDC_GET_ENCAPSULATED_RESPONSE:
* case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
* case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
* case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
* case USB_CDC_GET_ETHERNET_STATISTIC:
*/
default:
invalid:
DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
}
/* respond with data transfer or status phase? */
if (value >= 0) {
DBG(cdev, "ecm req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
req->zero = 0;
req->length = value;
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0)
ERROR(cdev, "ecm req %02x.%02x response err %d\n",
ctrl->bRequestType, ctrl->bRequest,
value);
}
/* device either stalls (value < 0) or reports success */
return value;
}
static int ecm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
struct f_ecm *ecm = func_to_ecm(f);
struct usb_composite_dev *cdev = f->config->cdev;
/* Control interface has only altsetting 0 */
if (intf == ecm->ctrl_id) {
if (alt != 0)
goto fail;
if (ecm->notify->driver_data) {
VDBG(cdev, "reset ecm control %d\n", intf);
usb_ep_disable(ecm->notify);
} else {
VDBG(cdev, "init ecm ctrl %d\n", intf);
ecm->notify_desc = ep_choose(cdev->gadget,
ecm->hs.notify,
ecm->fs.notify);
}
usb_ep_enable(ecm->notify, ecm->notify_desc);
ecm->notify->driver_data = ecm;
/* Data interface has two altsettings, 0 and 1 */
} else if (intf == ecm->data_id) {
if (alt > 1)
goto fail;
if (ecm->port.in_ep->driver_data) {
DBG(cdev, "reset ecm\n");
gether_disconnect(&ecm->port);
}
if (!ecm->port.in) {
DBG(cdev, "init ecm\n");
ecm->port.in = ep_choose(cdev->gadget,
ecm->hs.in, ecm->fs.in);
ecm->port.out = ep_choose(cdev->gadget,
ecm->hs.out, ecm->fs.out);
}
/* CDC Ethernet only sends data in non-default altsettings.
* Changing altsettings resets filters, statistics, etc.
*/
if (alt == 1) {
struct net_device *net;
/* Enable zlps by default for ECM conformance;
* override for musb_hdrc (avoids txdma ovhead).
*/
ecm->port.is_zlp_ok = !(gadget_is_musbhdrc(cdev->gadget)
);
ecm->port.cdc_filter = DEFAULT_FILTER;
DBG(cdev, "activate ecm\n");
net = gether_connect(&ecm->port);
if (IS_ERR(net))
return PTR_ERR(net);
}
/* NOTE this can be a minor disagreement with the ECM spec,
* which says speed notifications will "always" follow
* connection notifications. But we allow one connect to
* follow another (if the first is in flight), and instead
* just guarantee that a speed notification is always sent.
*/
ecm_notify(ecm);
} else
goto fail;
return 0;
fail:
return -EINVAL;
}
/* Because the data interface supports multiple altsettings,
* this ECM function *MUST* implement a get_alt() method.
*/
static int ecm_get_alt(struct usb_function *f, unsigned intf)
{
struct f_ecm *ecm = func_to_ecm(f);
if (intf == ecm->ctrl_id)
return 0;
return ecm->port.in_ep->driver_data ? 1 : 0;
}
static void ecm_disable(struct usb_function *f)
{
struct f_ecm *ecm = func_to_ecm(f);
struct usb_composite_dev *cdev = f->config->cdev;
DBG(cdev, "ecm deactivated\n");
if (ecm->port.in_ep->driver_data)
gether_disconnect(&ecm->port);
if (ecm->notify->driver_data) {
usb_ep_disable(ecm->notify);
ecm->notify->driver_data = NULL;
ecm->notify_desc = NULL;
}
}
/*-------------------------------------------------------------------------*/
/*
* Callbacks let us notify the host about connect/disconnect when the
* net device is opened or closed.
*
* For testing, note that link states on this side include both opened
* and closed variants of:
*
* - disconnected/unconfigured
* - configured but inactive (data alt 0)
* - configured and active (data alt 1)
*
* Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and
* SET_INTERFACE (altsetting). Remember also that "configured" doesn't
* imply the host is actually polling the notification endpoint, and
* likewise that "active" doesn't imply it's actually using the data
* endpoints for traffic.
*/
static void ecm_open(struct gether *geth)
{
struct f_ecm *ecm = func_to_ecm(&geth->func);
DBG(ecm->port.func.config->cdev, "%s\n", __func__);
ecm->is_open = true;
ecm_notify(ecm);
}
static void ecm_close(struct gether *geth)
{
struct f_ecm *ecm = func_to_ecm(&geth->func);
DBG(ecm->port.func.config->cdev, "%s\n", __func__);
ecm->is_open = false;
ecm_notify(ecm);
}
/*-------------------------------------------------------------------------*/
/* ethernet function driver setup/binding */
static int __init
ecm_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_ecm *ecm = func_to_ecm(f);
int status;
struct usb_ep *ep;
/* allocate instance-specific interface IDs */
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
ecm->ctrl_id = status;
ecm_control_intf.bInterfaceNumber = status;
ecm_union_desc.bMasterInterface0 = status;
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
ecm->data_id = status;
ecm_data_nop_intf.bInterfaceNumber = status;
ecm_data_intf.bInterfaceNumber = status;
ecm_union_desc.bSlaveInterface0 = status;
status = -ENODEV;
/* allocate instance-specific endpoints */
ep = usb_ep_autoconfig(cdev->gadget, &fs_ecm_in_desc);
if (!ep)
goto fail;
ecm->port.in_ep = ep;
ep->driver_data = cdev; /* claim */
ep = usb_ep_autoconfig(cdev->gadget, &fs_ecm_out_desc);
if (!ep)
goto fail;
ecm->port.out_ep = ep;
ep->driver_data = cdev; /* claim */
/* NOTE: a status/notification endpoint is *OPTIONAL* but we
* don't treat it that way. It's simpler, and some newer CDC
* profiles (wireless handsets) no longer treat it as optional.
*/
ep = usb_ep_autoconfig(cdev->gadget, &fs_ecm_notify_desc);
if (!ep)
goto fail;
ecm->notify = ep;
ep->driver_data = cdev; /* claim */
status = -ENOMEM;
/* allocate notification request and buffer */
ecm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
if (!ecm->notify_req)
goto fail;
ecm->notify_req->buf = kmalloc(ECM_STATUS_BYTECOUNT, GFP_KERNEL);
if (!ecm->notify_req->buf)
goto fail;
ecm->notify_req->context = ecm;
ecm->notify_req->complete = ecm_notify_complete;
/* copy descriptors, and track endpoint copies */
f->descriptors = usb_copy_descriptors(ecm_fs_function);
if (!f->descriptors)
goto fail;
ecm->fs.in = usb_find_endpoint(ecm_fs_function,
f->descriptors, &fs_ecm_in_desc);
ecm->fs.out = usb_find_endpoint(ecm_fs_function,
f->descriptors, &fs_ecm_out_desc);
ecm->fs.notify = usb_find_endpoint(ecm_fs_function,
f->descriptors, &fs_ecm_notify_desc);
/* support all relevant hardware speeds... we expect that when
* hardware is dual speed, all bulk-capable endpoints work at
* both speeds
*/
if (gadget_is_dualspeed(c->cdev->gadget)) {
hs_ecm_in_desc.bEndpointAddress =
fs_ecm_in_desc.bEndpointAddress;
hs_ecm_out_desc.bEndpointAddress =
fs_ecm_out_desc.bEndpointAddress;
hs_ecm_notify_desc.bEndpointAddress =
fs_ecm_notify_desc.bEndpointAddress;
/* copy descriptors, and track endpoint copies */
f->hs_descriptors = usb_copy_descriptors(ecm_hs_function);
if (!f->hs_descriptors)
goto fail;
ecm->hs.in = usb_find_endpoint(ecm_hs_function,
f->hs_descriptors, &hs_ecm_in_desc);
ecm->hs.out = usb_find_endpoint(ecm_hs_function,
f->hs_descriptors, &hs_ecm_out_desc);
ecm->hs.notify = usb_find_endpoint(ecm_hs_function,
f->hs_descriptors, &hs_ecm_notify_desc);
}
/* NOTE: all that is done without knowing or caring about
* the network link ... which is unavailable to this code
* until we're activated via set_alt().
*/
ecm->port.open = ecm_open;
ecm->port.close = ecm_close;
DBG(cdev, "CDC Ethernet: %s speed IN/%s OUT/%s NOTIFY/%s\n",
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
ecm->port.in_ep->name, ecm->port.out_ep->name,
ecm->notify->name);
return 0;
fail:
if (f->descriptors)
usb_free_descriptors(f->descriptors);
if (ecm->notify_req) {
kfree(ecm->notify_req->buf);
usb_ep_free_request(ecm->notify, ecm->notify_req);
}
/* we might as well release our claims on endpoints */
if (ecm->notify)
ecm->notify->driver_data = NULL;
if (ecm->port.out)
ecm->port.out_ep->driver_data = NULL;
if (ecm->port.in)
ecm->port.in_ep->driver_data = NULL;
ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
return status;
}
static void
ecm_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct f_ecm *ecm = func_to_ecm(f);
DBG(c->cdev, "ecm unbind\n");
if (gadget_is_dualspeed(c->cdev->gadget))
usb_free_descriptors(f->hs_descriptors);
usb_free_descriptors(f->descriptors);
kfree(ecm->notify_req->buf);
usb_ep_free_request(ecm->notify, ecm->notify_req);
ecm_string_defs[1].s = NULL;
kfree(ecm);
}
/**
* ecm_bind_config - add CDC Ethernet network link to a configuration
* @c: the configuration to support the network link
* @ethaddr: a buffer in which the ethernet address of the host side
* side of the link was recorded
* Context: single threaded during gadget setup
*
* Returns zero on success, else negative errno.
*
* Caller must have called @gether_setup(). Caller is also responsible
* for calling @gether_cleanup() before module unload.
*/
int __init ecm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
{
struct f_ecm *ecm;
int status;
if (!can_support_ecm(c->cdev->gadget) || !ethaddr)
return -EINVAL;
/* maybe allocate device-global string IDs */
if (ecm_string_defs[0].id == 0) {
/* control interface label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ecm_string_defs[0].id = status;
ecm_control_intf.iInterface = status;
/* data interface label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ecm_string_defs[2].id = status;
ecm_data_intf.iInterface = status;
/* MAC address */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ecm_string_defs[1].id = status;
ecm_desc.iMACAddress = status;
}
/* allocate and initialize one new instance */
ecm = kzalloc(sizeof *ecm, GFP_KERNEL);
if (!ecm)
return -ENOMEM;
/* export host's Ethernet address in CDC format */
snprintf(ecm->ethaddr, sizeof ecm->ethaddr,
"%02X%02X%02X%02X%02X%02X",
ethaddr[0], ethaddr[1], ethaddr[2],
ethaddr[3], ethaddr[4], ethaddr[5]);
ecm_string_defs[1].s = ecm->ethaddr;
ecm->port.cdc_filter = DEFAULT_FILTER;
ecm->port.func.name = "cdc_ethernet";
ecm->port.func.strings = ecm_strings;
/* descriptors are per-instance copies */
ecm->port.func.bind = ecm_bind;
ecm->port.func.unbind = ecm_unbind;
ecm->port.func.set_alt = ecm_set_alt;
ecm->port.func.get_alt = ecm_get_alt;
ecm->port.func.setup = ecm_setup;
ecm->port.func.disable = ecm_disable;
status = usb_add_function(c, &ecm->port.func);
if (status) {
ecm_string_defs[1].s = NULL;
kfree(ecm);
}
return status;
}