From: Paul Elder <paul.elder@xxxxxxxxxxxxxxxx>
Some attributes of the UVC frame descriptors should be read-only in
configfs, such as bFrameIndex. Add a read-only version of
UVCG_FRAME_ATTR to achieve this.
Signed-off-by: Paul Elder <paul.elder@xxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/function/uvc_configfs.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index 90de6418209b..0ad6ea57d0b7 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -1067,6 +1067,30 @@ static struct uvcg_frame *to_uvcg_frame(struct config_item *item)
return container_of(item, struct uvcg_frame, item);
}
+#define UVCG_FRAME_ATTR_RO(cname, aname, to_cpu_endian, to_little_endian, bits) \
+static ssize_t uvcg_frame_##cname##_show(struct config_item *item, char *page)\
+{ \
+ struct uvcg_frame *f = to_uvcg_frame(item); \
+ struct f_uvc_opts *opts; \
+ struct config_item *opts_item; \
+ struct mutex *su_mutex = &f->item.ci_group->cg_subsys->su_mutex;\
+ int result; \
+ \
+ mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
+ \
+ opts_item = f->item.ci_parent->ci_parent->ci_parent->ci_parent; \
+ opts = to_f_uvc_opts(opts_item); \
+ \
+ mutex_lock(&opts->lock); \
+ result = sprintf(page, "%d\n", to_cpu_endian(f->frame.cname)); \
+ mutex_unlock(&opts->lock); \
+ \
+ mutex_unlock(su_mutex); \
+ return result; \
+} \
+ \
+UVC_ATTR_RO(uvcg_frame_, cname, aname);
+
#define UVCG_FRAME_ATTR(cname, aname, to_cpu_endian, to_little_endian, bits) \
static ssize_t uvcg_frame_##cname##_show(struct config_item *item, char *page)\
{ \
--
Regards,
Laurent Pinchart
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