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usb: gadget: add RNDIS configfs options for class/subclass/protocol 

This adds 3 new options to the RNDIS gadget function configs. It allows
overriding the default USB interface class/subclass/protocol.

The motivation for this is that if you set the values to "ef" (Misc),
"04" (RNDIS), "01" (Ethernet) respectively, then the device will be
recognized by the rndiscmp.inf file in Windows Vista and newer and will
cause Windows to load the correct RNDIS driver without the need for a
custom (signed) .inf file.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
David Lechner 2017-07-29 20:12:57 -05:00 committed by Felipe Balbi
parent 6cea1449f6
commit 73517cf49b
4 changed files with 62 additions and 0 deletions
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3
Documentation/ABI/testing/configfs-usb-gadget-rndis
View File

@ -12,3 +12,6 @@ Description:
Ethernet over USB link
dev_addr - MAC address of device's end of this
Ethernet over USB link
class - USB interface class, default is 02 (hex)
subclass - USB interface subclass, default is 06 (hex)
protocol - USB interface protocol, default is 00 (hex)

20
drivers/usb/gadget/function/f_rndis.c
View File

@ -691,6 +691,10 @@ rndis_bind(struct usb_configuration *c, struct usb_function *f)
f->os_desc_table[0].os_desc = &rndis_opts->rndis_os_desc;
}
rndis_iad_descriptor.bFunctionClass = rndis_opts->class;
rndis_iad_descriptor.bFunctionSubClass = rndis_opts->subclass;
rndis_iad_descriptor.bFunctionProtocol = rndis_opts->protocol;
/*
* in drivers/usb/gadget/configfs.c:configfs_composite_bind()
* configurations are bound in sequence with list_for_each_entry,
@ -866,11 +870,23 @@ USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(rndis);
/* f_rndis_opts_ifname */
USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(rndis);
/* f_rndis_opts_class */
USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, class);
/* f_rndis_opts_subclass */
USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, subclass);
/* f_rndis_opts_protocol */
USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(rndis, protocol);
static struct configfs_attribute *rndis_attrs[] = {
&rndis_opts_attr_dev_addr,
&rndis_opts_attr_host_addr,
&rndis_opts_attr_qmult,
&rndis_opts_attr_ifname,
&rndis_opts_attr_class,
&rndis_opts_attr_subclass,
&rndis_opts_attr_protocol,
NULL,
};
@ -916,6 +932,10 @@ static struct usb_function_instance *rndis_alloc_inst(void)
}
INIT_LIST_HEAD(&opts->rndis_os_desc.ext_prop);
opts->class = rndis_iad_descriptor.bFunctionClass;
opts->subclass = rndis_iad_descriptor.bFunctionSubClass;
opts->protocol = rndis_iad_descriptor.bFunctionProtocol;
descs[0] = &opts->rndis_os_desc;
names[0] = "rndis";
config_group_init_type_name(&opts->func_inst.group, "",

35
drivers/usb/gadget/function/u_ether_configfs.h
View File

@ -153,4 +153,39 @@ out: \
\
CONFIGFS_ATTR_RO(_f_##_opts_, ifname)
#define USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(_f_, _n_) \
static ssize_t _f_##_opts_##_n_##_show(struct config_item *item,\
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
ret = sprintf(page, "%02x\n", opts->_n_); \
mutex_unlock(&opts->lock); \
\
return ret; \
} \
\
static ssize_t _f_##_opts_##_n_##_store(struct config_item *item,\
const char *page, \
size_t len) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
u8 val; \
\
mutex_lock(&opts->lock); \
ret = sscanf(page, "%02hhx", &val); \
if (ret > 0) { \
opts->_n_ = val; \
ret = len; \
} \
mutex_unlock(&opts->lock); \
\
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, _n_)
#endif /* __U_ETHER_CONFIGFS_H */

4
drivers/usb/gadget/function/u_rndis.h
View File

@ -29,6 +29,10 @@ struct f_rndis_opts {
struct usb_os_desc rndis_os_desc;
char rndis_ext_compat_id[16];
u8 class;
u8 subclass;
u8 protocol;
/*
* Read/write access to configfs attributes is handled by configfs.
*