Commit a36afe78 authored by Daniel Scally's avatar Daniel Scally Committed by Greg Kroah-Hartman
Browse files

usb: gadget: uvc: Add new enable_interrupt_ep attribute 



Add a new attribute to the default control config group that allows
users to specify whether they want to enable the optional interrupt
endpoint for the VideoControl interface.

Signed-off-by: default avatarDaniel Scally <dan.scally@ideasonboard.com>
Link: https://lore.kernel.org/r/20230130105045.120886-3-dan.scally@ideasonboard.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3078212c

Documentation/ABI/testing/configfs-usb-gadget-uvc

+3 −1
Original line number Diff line number Diff line
@@ -15,11 +15,13 @@ Date: Dec 2014 
KernelVersion:	4.0

Description:	Control descriptors



		All attributes read only:

		All attributes read only except enable_interrupt_ep:



		================	=============================

		bInterfaceNumber	USB interface number for this

					streaming interface

		enable_interrupt_ep	flag to enable the interrupt

					endpoint for the VC interface

		================	=============================



What:		/config/usb-gadget/gadget/functions/uvc.name/control/class

drivers/usb/gadget/function/u_uvc.h

+2 −0
Original line number Diff line number Diff line
@@ -29,6 +29,8 @@ struct f_uvc_opts { 
	unsigned int					streaming_interface;

	char						function_name[32];



	bool						enable_interrupt_ep;



	/*

	 * Control descriptors array pointers for full-/high-speed and

	 * super-speed. They point by default to the uvc_fs_control_cls and

drivers/usb/gadget/function/uvc_configfs.c

+53 −0
Original line number Diff line number Diff line
@@ -716,8 +716,61 @@ static ssize_t uvcg_default_control_b_interface_number_show( 


UVC_ATTR_RO(uvcg_default_control_, b_interface_number, bInterfaceNumber);



static ssize_t uvcg_default_control_enable_interrupt_ep_show(

	struct config_item *item, char *page)

{

	struct config_group *group = to_config_group(item);

	struct mutex *su_mutex = &group->cg_subsys->su_mutex;

	struct config_item *opts_item;

	struct f_uvc_opts *opts;

	int result = 0;



	mutex_lock(su_mutex); /* for navigating configfs hierarchy */



	opts_item = item->ci_parent;

	opts = to_f_uvc_opts(opts_item);



	mutex_lock(&opts->lock);

	result += sprintf(page, "%u\n", opts->enable_interrupt_ep);

	mutex_unlock(&opts->lock);



	mutex_unlock(su_mutex);



	return result;

}



static ssize_t uvcg_default_control_enable_interrupt_ep_store(

	struct config_item *item, const char *page, size_t len)

{

	struct config_group *group = to_config_group(item);

	struct mutex *su_mutex = &group->cg_subsys->su_mutex;

	struct config_item *opts_item;

	struct f_uvc_opts *opts;

	ssize_t ret;

	u8 num;



	ret = kstrtou8(page, 0, &num);

	if (ret)

		return ret;



	mutex_lock(su_mutex); /* for navigating configfs hierarchy */



	opts_item = item->ci_parent;

	opts = to_f_uvc_opts(opts_item);



	mutex_lock(&opts->lock);

	opts->enable_interrupt_ep = num;

	mutex_unlock(&opts->lock);



	mutex_unlock(su_mutex);



	return len;

}

UVC_ATTR(uvcg_default_control_, enable_interrupt_ep, enable_interrupt_ep);



static struct configfs_attribute *uvcg_default_control_attrs[] = {

	&uvcg_default_control_attr_b_interface_number,

	&uvcg_default_control_attr_enable_interrupt_ep,

	NULL,

};