In preparation for allowing more than the default color matching
descriptor, make the color matching attributes writeable.
Signed-off-by: Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx>
---
.../ABI/testing/configfs-usb-gadget-uvc | 2 +-
drivers/usb/gadget/function/uvc_configfs.c | 32 ++++++++++++++++++-
2 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uvc b/Documentation/ABI/testing/configfs-usb-gadget-uvc
index 611b23e6488d..3512f4899fe3 100644
--- a/Documentation/ABI/testing/configfs-usb-gadget-uvc
+++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc
@@ -165,7 +165,7 @@ Date: Dec 2014
KernelVersion: 4.0
Description: Default color matching descriptors
- All attributes read only:
+ All attributes read/write:
======================== ======================================
bMatrixCoefficients matrix used to compute luma and
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index 6f5932c9f09c..4fbc42d738a4 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -1845,7 +1845,37 @@ static ssize_t uvcg_color_matching_##cname##_show( \
return result; \
} \
\
-UVC_ATTR_RO(uvcg_color_matching_, cname, aname)
+static ssize_t uvcg_color_matching_##cname##_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 uvcg_cmd *cmd = to_uvcg_cmd(group); \
+ struct f_uvc_opts *opts; \
+ struct config_item *opts_item; \
+ int ret; \
+ u##bits num; \
+ \
+ ret = kstrtou##bits(page, 0, &num); \
+ if (ret) \
+ return ret; \
+ \
+ 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); \
+ \
+ mutex_lock(&opts->lock); \
+ \
+ cmd->desc.aname = num; \
+ ret = len; \
+ \
+ mutex_unlock(&opts->lock); \
+ mutex_unlock(su_mutex); \
+ \
+ return ret; \
+} \
+UVC_ATTR(uvcg_color_matching_, cname, aname)
UVCG_COLOR_MATCHING_ATTR(b_color_primaries, bColorPrimaries, 8);
UVCG_COLOR_MATCHING_ATTR(b_transfer_characteristics, bTransferCharacteristics, 8);
--
2.34.1
