usb ethernet gadget: split CDC Subset function
This is a simple "CDC Subset" (and MCCI "SAFE") function driver, extracted from the all-in-one Ethernet gadget driver. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell
Greg Kroah-Hartman
Родитель
2b3d942c48
Коммит
8a40819e97
|
|
@ -25,7 +25,7 @@ obj-$(CONFIG_USB_M66592) += m66592-udc.o
|
|||
C_UTILS = composite.o usbstring.o config.o epautoconf.o
|
||||
|
||||
g_zero-objs := zero.o f_sourcesink.o f_loopback.o $(C_UTILS)
|
||||
g_ether-objs := ether.o u_ether.o $(C_UTILS)
|
||||
g_ether-objs := ether.o u_ether.o f_subset.o $(C_UTILS)
|
||||
g_serial-objs := serial.o u_serial.o f_acm.o f_serial.o $(C_UTILS)
|
||||
g_midi-objs := gmidi.o usbstring.o config.o epautoconf.o
|
||||
gadgetfs-objs := inode.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,423 @@
|
|||
/*
|
||||
* f_subset.c -- "CDC Subset" Ethernet 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
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/etherdevice.h>
|
||||
|
||||
#include "u_ether.h"
|
||||
|
||||
|
||||
/*
|
||||
* This function packages a simple "CDC Subset" Ethernet port with no real
|
||||
* control mechanisms; just raw data transfer over two bulk endpoints.
|
||||
* The data transfer model is exactly that of CDC Ethernet, which is
|
||||
* why we call it the "CDC Subset".
|
||||
*
|
||||
* Because it's not standardized, this has some interoperability issues.
|
||||
* They mostly relate to driver binding, since the data transfer model is
|
||||
* so simple (CDC Ethernet). The original versions of this protocol used
|
||||
* specific product/vendor IDs: byteswapped IDs for Digital Equipment's
|
||||
* SA-1100 "Itsy" board, which could run Linux 2.4 kernels and supported
|
||||
* daughtercards with USB peripheral connectors. (It was used more often
|
||||
* with other boards, using the Itsy identifiers.) Linux hosts recognized
|
||||
* this with CONFIG_USB_ARMLINUX; these devices have only one configuration
|
||||
* and one interface.
|
||||
*
|
||||
* At some point, MCCI defined a (nonconformant) CDC MDLM variant called
|
||||
* "SAFE", which happens to have a mode which is identical to the "CDC
|
||||
* Subset" in terms of data transfer and lack of control model. This was
|
||||
* adopted by later Sharp Zaurus models, and by some other software which
|
||||
* Linux hosts recognize with CONFIG_USB_NET_ZAURUS.
|
||||
*
|
||||
* Because Microsoft's RNDIS drivers are far from robust, we added a few
|
||||
* descriptors to the CDC Subset code, making this code look like a SAFE
|
||||
* implementation. This lets you use MCCI's host side MS-Windows drivers
|
||||
* if you get fed up with RNDIS. It also makes it easier for composite
|
||||
* drivers to work, since they can use class based binding instead of
|
||||
* caring about specific product and vendor IDs.
|
||||
*/
|
||||
|
||||
struct geth_descs {
|
||||
struct usb_endpoint_descriptor *in;
|
||||
struct usb_endpoint_descriptor *out;
|
||||
};
|
||||
|
||||
struct f_gether {
|
||||
struct gether port;
|
||||
|
||||
char ethaddr[14];
|
||||
|
||||
struct usb_descriptor_header **fs_function;
|
||||
struct geth_descs fs;
|
||||
struct usb_descriptor_header **hs_function;
|
||||
struct geth_descs hs;
|
||||
};
|
||||
|
||||
static inline struct f_gether *func_to_geth(struct usb_function *f)
|
||||
{
|
||||
return container_of(f, struct f_gether, port.func);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*/
|
||||
|
||||
/*
|
||||
* "Simple" CDC-subset option is a simple vendor-neutral model that most
|
||||
* full speed controllers can handle: one interface, two bulk endpoints.
|
||||
* To assist host side drivers, we fancy it up a bit, and add descriptors so
|
||||
* some host side drivers will understand it as a "SAFE" variant.
|
||||
*
|
||||
* "SAFE" loosely follows CDC WMC MDLM, violating the spec in various ways.
|
||||
* Data endpoints live in the control interface, there's no data interface.
|
||||
* And it's not used to talk to a cell phone radio.
|
||||
*/
|
||||
|
||||
/* interface descriptor: */
|
||||
|
||||
static struct usb_interface_descriptor subset_data_intf __initdata = {
|
||||
.bLength = sizeof subset_data_intf,
|
||||
.bDescriptorType = USB_DT_INTERFACE,
|
||||
|
||||
/* .bInterfaceNumber = DYNAMIC */
|
||||
.bAlternateSetting = 0,
|
||||
.bNumEndpoints = 2,
|
||||
.bInterfaceClass = USB_CLASS_COMM,
|
||||
.bInterfaceSubClass = USB_CDC_SUBCLASS_MDLM,
|
||||
.bInterfaceProtocol = 0,
|
||||
/* .iInterface = DYNAMIC */
|
||||
};
|
||||
|
||||
static struct usb_cdc_header_desc header_desc __initdata = {
|
||||
.bLength = sizeof header_desc,
|
||||
.bDescriptorType = USB_DT_CS_INTERFACE,
|
||||
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
|
||||
|
||||
.bcdCDC = __constant_cpu_to_le16(0x0110),
|
||||
};
|
||||
|
||||
static struct usb_cdc_mdlm_desc mdlm_desc __initdata = {
|
||||
.bLength = sizeof mdlm_desc,
|
||||
.bDescriptorType = USB_DT_CS_INTERFACE,
|
||||
.bDescriptorSubType = USB_CDC_MDLM_TYPE,
|
||||
|
||||
.bcdVersion = __constant_cpu_to_le16(0x0100),
|
||||
.bGUID = {
|
||||
0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
|
||||
0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
|
||||
},
|
||||
};
|
||||
|
||||
/* since "usb_cdc_mdlm_detail_desc" is a variable length structure, we
|
||||
* can't really use its struct. All we do here is say that we're using
|
||||
* the submode of "SAFE" which directly matches the CDC Subset.
|
||||
*/
|
||||
static u8 mdlm_detail_desc[] __initdata = {
|
||||
6,
|
||||
USB_DT_CS_INTERFACE,
|
||||
USB_CDC_MDLM_DETAIL_TYPE,
|
||||
|
||||
0, /* "SAFE" */
|
||||
0, /* network control capabilities (none) */
|
||||
0, /* network data capabilities ("raw" encapsulation) */
|
||||
};
|
||||
|
||||
static struct usb_cdc_ether_desc ether_desc __initdata = {
|
||||
.bLength = sizeof ether_desc,
|
||||
.bDescriptorType = USB_DT_CS_INTERFACE,
|
||||
.bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
|
||||
|
||||
/* this descriptor actually adds value, surprise! */
|
||||
/* .iMACAddress = DYNAMIC */
|
||||
.bmEthernetStatistics = __constant_cpu_to_le32(0), /* no statistics */
|
||||
.wMaxSegmentSize = __constant_cpu_to_le16(ETH_FRAME_LEN),
|
||||
.wNumberMCFilters = __constant_cpu_to_le16(0),
|
||||
.bNumberPowerFilters = 0,
|
||||
};
|
||||
|
||||
/* full speed support: */
|
||||
|
||||
static struct usb_endpoint_descriptor fs_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_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 *fs_eth_function[] __initdata = {
|
||||
(struct usb_descriptor_header *) &subset_data_intf,
|
||||
(struct usb_descriptor_header *) &header_desc,
|
||||
(struct usb_descriptor_header *) &mdlm_desc,
|
||||
(struct usb_descriptor_header *) &mdlm_detail_desc,
|
||||
(struct usb_descriptor_header *) ðer_desc,
|
||||
(struct usb_descriptor_header *) &fs_in_desc,
|
||||
(struct usb_descriptor_header *) &fs_out_desc,
|
||||
NULL,
|
||||
};
|
||||
|
||||
/* high speed support: */
|
||||
|
||||
static struct usb_endpoint_descriptor hs_in_desc __initdata = {
|
||||
.bLength = USB_DT_ENDPOINT_SIZE,
|
||||
.bDescriptorType = USB_DT_ENDPOINT,
|
||||
|
||||
.bmAttributes = USB_ENDPOINT_XFER_BULK,
|
||||
.wMaxPacketSize = __constant_cpu_to_le16(512),
|
||||
};
|
||||
|
||||
static struct usb_endpoint_descriptor hs_out_desc __initdata = {
|
||||
.bLength = USB_DT_ENDPOINT_SIZE,
|
||||
.bDescriptorType = USB_DT_ENDPOINT,
|
||||
|
||||
.bmAttributes = USB_ENDPOINT_XFER_BULK,
|
||||
.wMaxPacketSize = __constant_cpu_to_le16(512),
|
||||
};
|
||||
|
||||
static struct usb_descriptor_header *hs_eth_function[] __initdata = {
|
||||
(struct usb_descriptor_header *) &subset_data_intf,
|
||||
(struct usb_descriptor_header *) &header_desc,
|
||||
(struct usb_descriptor_header *) &mdlm_desc,
|
||||
(struct usb_descriptor_header *) &mdlm_detail_desc,
|
||||
(struct usb_descriptor_header *) ðer_desc,
|
||||
(struct usb_descriptor_header *) &hs_in_desc,
|
||||
(struct usb_descriptor_header *) &hs_out_desc,
|
||||
NULL,
|
||||
};
|
||||
|
||||
/* string descriptors: */
|
||||
|
||||
static struct usb_string geth_string_defs[] = {
|
||||
[0].s = "CDC Ethernet Subset/SAFE",
|
||||
[1].s = NULL /* DYNAMIC */,
|
||||
{ } /* end of list */
|
||||
};
|
||||
|
||||
static struct usb_gadget_strings geth_string_table = {
|
||||
.language = 0x0409, /* en-us */
|
||||
.strings = geth_string_defs,
|
||||
};
|
||||
|
||||
static struct usb_gadget_strings *geth_strings[] = {
|
||||
&geth_string_table,
|
||||
NULL,
|
||||
};
|
||||
|
||||
/*-------------------------------------------------------------------------*/
|
||||
|
||||
static int geth_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
|
||||
{
|
||||
struct f_gether *geth = func_to_geth(f);
|
||||
struct usb_composite_dev *cdev = f->config->cdev;
|
||||
struct net_device *net;
|
||||
|
||||
/* we know alt == 0, so this is an activation or a reset */
|
||||
|
||||
if (geth->port.in_ep->driver_data) {
|
||||
DBG(cdev, "reset cdc subset\n");
|
||||
gether_disconnect(&geth->port);
|
||||
}
|
||||
|
||||
DBG(cdev, "init + activate cdc subset\n");
|
||||
geth->port.in = ep_choose(cdev->gadget,
|
||||
geth->hs.in, geth->fs.in);
|
||||
geth->port.out = ep_choose(cdev->gadget,
|
||||
geth->hs.out, geth->fs.out);
|
||||
|
||||
net = gether_connect(&geth->port);
|
||||
return IS_ERR(net) ? PTR_ERR(net) : 0;
|
||||
}
|
||||
|
||||
static void geth_disable(struct usb_function *f)
|
||||
{
|
||||
struct f_gether *geth = func_to_geth(f);
|
||||
struct usb_composite_dev *cdev = f->config->cdev;
|
||||
|
||||
DBG(cdev, "net deactivated\n");
|
||||
gether_disconnect(&geth->port);
|
||||
}
|
||||
|
||||
/*-------------------------------------------------------------------------*/
|
||||
|
||||
/* serial function driver setup/binding */
|
||||
|
||||
static int __init
|
||||
geth_bind(struct usb_configuration *c, struct usb_function *f)
|
||||
{
|
||||
struct usb_composite_dev *cdev = c->cdev;
|
||||
struct f_gether *geth = func_to_geth(f);
|
||||
int status;
|
||||
struct usb_ep *ep;
|
||||
|
||||
/* allocate instance-specific interface IDs */
|
||||
status = usb_interface_id(c, f);
|
||||
if (status < 0)
|
||||
goto fail;
|
||||
subset_data_intf.bInterfaceNumber = status;
|
||||
|
||||
status = -ENODEV;
|
||||
|
||||
/* allocate instance-specific endpoints */
|
||||
ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc);
|
||||
if (!ep)
|
||||
goto fail;
|
||||
geth->port.in_ep = ep;
|
||||
ep->driver_data = cdev; /* claim */
|
||||
|
||||
ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc);
|
||||
if (!ep)
|
||||
goto fail;
|
||||
geth->port.out_ep = ep;
|
||||
ep->driver_data = cdev; /* claim */
|
||||
|
||||
/* copy descriptors, and track endpoint copies */
|
||||
f->descriptors = usb_copy_descriptors(fs_eth_function);
|
||||
|
||||
geth->fs.in = usb_find_endpoint(fs_eth_function,
|
||||
f->descriptors, &fs_in_desc);
|
||||
geth->fs.out = usb_find_endpoint(fs_eth_function,
|
||||
f->descriptors, &fs_out_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_in_desc.bEndpointAddress =
|
||||
fs_in_desc.bEndpointAddress;
|
||||
hs_out_desc.bEndpointAddress =
|
||||
fs_out_desc.bEndpointAddress;
|
||||
|
||||
/* copy descriptors, and track endpoint copies */
|
||||
f->hs_descriptors = usb_copy_descriptors(hs_eth_function);
|
||||
|
||||
geth->hs.in = usb_find_endpoint(hs_eth_function,
|
||||
f->hs_descriptors, &hs_in_desc);
|
||||
geth->hs.out = usb_find_endpoint(hs_eth_function,
|
||||
f->hs_descriptors, &hs_out_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().
|
||||
*/
|
||||
|
||||
DBG(cdev, "CDC Subset: %s speed IN/%s OUT/%s\n",
|
||||
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
|
||||
geth->port.in_ep->name, geth->port.out_ep->name);
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
/* we might as well release our claims on endpoints */
|
||||
if (geth->port.out)
|
||||
geth->port.out_ep->driver_data = NULL;
|
||||
if (geth->port.in)
|
||||
geth->port.in_ep->driver_data = NULL;
|
||||
|
||||
ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
static void
|
||||
geth_unbind(struct usb_configuration *c, struct usb_function *f)
|
||||
{
|
||||
if (gadget_is_dualspeed(c->cdev->gadget))
|
||||
usb_free_descriptors(f->hs_descriptors);
|
||||
usb_free_descriptors(f->descriptors);
|
||||
geth_string_defs[1].s = NULL;
|
||||
kfree(func_to_geth(f));
|
||||
}
|
||||
|
||||
/**
|
||||
* geth_bind_config - add CDC Subset 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 geth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
|
||||
{
|
||||
struct f_gether *geth;
|
||||
int status;
|
||||
|
||||
if (!ethaddr)
|
||||
return -EINVAL;
|
||||
|
||||
/* maybe allocate device-global string IDs */
|
||||
if (geth_string_defs[0].id == 0) {
|
||||
|
||||
/* interface label */
|
||||
status = usb_string_id(c->cdev);
|
||||
if (status < 0)
|
||||
return status;
|
||||
geth_string_defs[0].id = status;
|
||||
subset_data_intf.iInterface = status;
|
||||
|
||||
/* MAC address */
|
||||
status = usb_string_id(c->cdev);
|
||||
if (status < 0)
|
||||
return status;
|
||||
geth_string_defs[1].id = status;
|
||||
ether_desc.iMACAddress = status;
|
||||
}
|
||||
|
||||
/* allocate and initialize one new instance */
|
||||
geth = kzalloc(sizeof *geth, GFP_KERNEL);
|
||||
if (!geth)
|
||||
return -ENOMEM;
|
||||
|
||||
/* export host's Ethernet address in CDC format */
|
||||
snprintf(geth->ethaddr, sizeof geth->ethaddr,
|
||||
"%02X%02X%02X%02X%02X%02X",
|
||||
ethaddr[0], ethaddr[1], ethaddr[2],
|
||||
ethaddr[3], ethaddr[4], ethaddr[5]);
|
||||
geth_string_defs[1].s = geth->ethaddr;
|
||||
|
||||
geth->port.cdc_filter = DEFAULT_FILTER;
|
||||
|
||||
geth->port.func.name = "cdc_subset";
|
||||
geth->port.func.strings = geth_strings;
|
||||
geth->port.func.bind = geth_bind;
|
||||
geth->port.func.unbind = geth_unbind;
|
||||
geth->port.func.set_alt = geth_set_alt;
|
||||
geth->port.func.disable = geth_disable;
|
||||
|
||||
status = usb_add_function(c, &geth->port.func);
|
||||
if (status) {
|
||||
geth_string_defs[1].s = NULL;
|
||||
kfree(geth);
|
||||
}
|
||||
return status;
|
||||
}
|
||||
|
|
@ -80,4 +80,7 @@ void gether_cleanup(void);
|
|||
struct net_device *gether_connect(struct gether *);
|
||||
void gether_disconnect(struct gether *);
|
||||
|
||||
/* each configuration may bind one instance of an ethernet link */
|
||||
int geth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
|
||||
|
||||
#endif /* __U_ETHER_H */
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче