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usb: gadget: uvc: Add new enable_interrupt_ep attribute

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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: Daniel Scally <dan.scally@ideasonboard.com>
Link: https://lore.kernel.org/r/20230130105045.120886-3-dan.scally@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Scally 2023-01-30 10:50:44 +00:00 committed by Greg Kroah-Hartman
parent 3078212caf
commit a36afe7804
3 changed files with 58 additions and 1 deletions
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4
Documentation/ABI/testing/configfs-usb-gadget-uvc
View File

@ -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

2
drivers/usb/gadget/function/u_uvc.h
View File

@ -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

53
drivers/usb/gadget/function/uvc_configfs.c
View File

@ -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,
};