Color matching descriptors are meant to be a per-format piece of data
and we need to be able to support different descriptors for different
formats. As a preliminary step towards that goal, switch the default
color matching configfs functionality to point to an instance of a
new struct uvcg_color_matching. Use the same default values for its
attributes as the currently hard-coded ones so that the interface to
userspace is consistent.
Signed-off-by: Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx>
---
Changes in v2:
- Renamed uvcg_cmd to uvcg_color_matching plus the associated
variables (Kieran, Laurent)
- Added a refcnt member to struct uvcg_color_matching
drivers/usb/gadget/function/uvc_configfs.c | 58 ++++++++++++++++------
drivers/usb/gadget/function/uvc_configfs.h | 9 ++++
2 files changed, 53 insertions(+), 14 deletions(-)
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index e28becd435bf..147d3def24dd 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -13,6 +13,7 @@
#include "uvc_configfs.h"
#include <linux/sort.h>
+#include <uapi/linux/usb/video.h>
/* -----------------------------------------------------------------------------
* Global Utility Structures and Macros
@@ -1788,20 +1789,21 @@ static ssize_t uvcg_color_matching_##cname##_show( \
struct config_item *item, char *page) \
{ \
struct config_group *group = to_config_group(item); \
+ struct uvcg_color_matching *color_match = \
+ to_uvcg_color_matching(group); \
struct f_uvc_opts *opts; \
struct config_item *opts_item; \
struct mutex *su_mutex = &group->cg_subsys->su_mutex; \
- struct uvc_color_matching_descriptor *cd; \
int result; \
\
mutex_lock(su_mutex); /* for navigating configfs hierarchy */ \
\
opts_item = group->cg_item.ci_parent->ci_parent->ci_parent; \
opts = to_f_uvc_opts(opts_item); \
- cd = &opts->uvc_color_matching; \
\
mutex_lock(&opts->lock); \
- result = sprintf(page, "%u\n", le##bits##_to_cpu(cd->aname)); \
+ result = sprintf(page, "%u\n", \
+ le##bits##_to_cpu(color_match->desc.aname)); \
mutex_unlock(&opts->lock); \
\
mutex_unlock(su_mutex); \
@@ -1823,29 +1825,57 @@ static struct configfs_attribute *uvcg_color_matching_attrs[] = {
NULL,
};
-static const struct uvcg_config_group_type uvcg_color_matching_type = {
- .type = {
- .ct_item_ops = &uvcg_config_item_ops,
- .ct_attrs = uvcg_color_matching_attrs,
- .ct_owner = THIS_MODULE,
- },
- .name = "default",
+static void uvcg_color_matching_release(struct config_item *item)
+{
+ struct uvcg_color_matching *color_match =
+ to_uvcg_color_matching(to_config_group(item));
+
+ kfree(color_match);
+}
+
+static struct configfs_item_operations uvcg_color_matching_item_ops = {
+ .release = uvcg_color_matching_release,
+};
+
+static const struct config_item_type uvcg_color_matching_type = {
+ .ct_item_ops = &uvcg_color_matching_item_ops,
+ .ct_attrs = uvcg_color_matching_attrs,
+ .ct_owner = THIS_MODULE,
};
/* -----------------------------------------------------------------------------
* streaming/color_matching
*/
+static int uvcg_color_matching_create_children(struct config_group *parent)
+{
+ struct uvcg_color_matching *color_match;
+
+ color_match = kzalloc(sizeof(*color_match), GFP_KERNEL);
+ if (!color_match)
+ return -ENOMEM;
+
+ color_match->desc.bLength = UVC_DT_COLOR_MATCHING_SIZE;
+ color_match->desc.bDescriptorType = USB_DT_CS_INTERFACE;
+ color_match->desc.bDescriptorSubType = UVC_VS_COLORFORMAT;
+ color_match->desc.bColorPrimaries = UVC_COLOR_PRIMARIES_BT_709_SRGB;
+ color_match->desc.bTransferCharacteristics = UVC_TRANSFER_CHARACTERISTICS_BT_709;
+ color_match->desc.bMatrixCoefficients = UVC_MATRIX_COEFFICIENTS_SMPTE_170M;
+
+ config_group_init_type_name(&color_match->group, "default",
+ &uvcg_color_matching_type);
+ configfs_add_default_group(&color_match->group, parent);
+
+ return 0;
+}
+
static const struct uvcg_config_group_type uvcg_color_matching_grp_type = {
.type = {
.ct_item_ops = &uvcg_config_item_ops,
.ct_owner = THIS_MODULE,
},
.name = "color_matching",
- .children = (const struct uvcg_config_group_type*[]) {
- &uvcg_color_matching_type,
- NULL,
- },
+ .create_children = uvcg_color_matching_create_children,
};
/* -----------------------------------------------------------------------------
diff --git a/drivers/usb/gadget/function/uvc_configfs.h b/drivers/usb/gadget/function/uvc_configfs.h
index ad2ec8c4c78c..c7392c9b840e 100644
--- a/drivers/usb/gadget/function/uvc_configfs.h
+++ b/drivers/usb/gadget/function/uvc_configfs.h
@@ -37,6 +37,15 @@ static inline struct uvcg_control_header *to_uvcg_control_header(struct config_i
return container_of(item, struct uvcg_control_header, item);
}
+struct uvcg_color_matching {
+ struct config_group group;
+ struct uvc_color_matching_descriptor desc;
+ unsigned int refcnt;
+};
+
+#define to_uvcg_color_matching(group_ptr) \
+container_of(group_ptr, struct uvcg_color_matching, group)
+
enum uvcg_format_type {
UVCG_UNCOMPRESSED = 0,
UVCG_MJPEG,
--
2.34.1
