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ANDROID: usb: gadget: Add configfs attribuite for controling match_existing_only

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Currently the "match_existing_only" of usb_gadget_driver in configfs is
set to one which is not flexible.
Dwc3 udc will be removed when usb core switch to host mode. This causes
failure of writing name of dwc3 udc to configfs's UDC attribuite.
To fix this we need to add a way to change the config of
"match_existing_only".
There are systems like Android do not support udev, so adding
"match_existing_only" attribute to allow configuration by user is cost little.
This patch adds a configfs attribuite for controling match_existing_only
which allow user to config "match_existing_only".

Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Bug: 146450171
Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I7c61a45cd4d22a188838659d4cc3f0fbe0ac1bcf
This commit is contained in:
Yu Chen 2019-04-20 14:40:18 +08:00 • committed by Alistair Delva
commit 8a880b68c5
1 changed files with 32 additions and 0 deletions
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32
drivers/usb/gadget/configfs.c
View file

@ -325,6 +325,36 @@ err:
return ret;
}
static ssize_t gadget_driver_match_existing_only_store(struct config_item *item,
const char *page, size_t len)
{
struct gadget_info *gi = to_gadget_info(item);
struct usb_gadget_driver *gadget_driver = &(gi->composite.gadget_driver);
bool match_existing_only;
int ret;
ret = kstrtobool(page, &match_existing_only);
if (ret)
return ret;
if (match_existing_only)
gadget_driver->match_existing_only = 1;
else
gadget_driver->match_existing_only = 0;
return len;
}
static ssize_t gadget_driver_match_existing_only_show(struct config_item *item,
char *page)
{
struct gadget_info *gi = to_gadget_info(item);
struct usb_gadget_driver *gadget_driver = &(gi->composite.gadget_driver);
bool match_existing_only = !!gadget_driver->match_existing_only;
return sprintf(page, "%s\n", match_existing_only ? "true" : "false");
}
CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
@ -334,6 +364,7 @@ CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
CONFIGFS_ATTR(gadget_dev_desc_, UDC);
CONFIGFS_ATTR(gadget_, driver_match_existing_only);
static struct configfs_attribute *gadget_root_attrs[] = {
&gadget_dev_desc_attr_bDeviceClass,
@ -345,6 +376,7 @@ static struct configfs_attribute *gadget_root_attrs[] = {
&gadget_dev_desc_attr_bcdDevice,
&gadget_dev_desc_attr_bcdUSB,
&gadget_dev_desc_attr_UDC,
&gadget_attr_driver_match_existing_only,
NULL,
};