@@ -83,6 +83,14 @@ struct f_uvc_opts {
struct uvc_descriptor_header **uvc_hs_streaming_cls;
struct uvc_descriptor_header **uvc_ss_streaming_cls;
+ /*
+ * Indexes into the function's string descriptors allowing users to set
+ * custom descriptions rather than the hard-coded defaults.
+ */
+ u8 iad_index;
+ u8 vs0_index;
+ u8 vs1_index;
+
/*
* Read/write access to configfs attributes is handled by configfs.
*
@@ -2953,8 +2953,68 @@ static void uvc_func_item_release(struct config_item *item)
usb_put_function_instance(&opts->func_inst);
}
+static int uvc_func_allow_link(struct config_item *src, struct config_item *tgt)
+{
+ struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
+ struct gadget_string *string;
+ struct config_item *strings;
+ struct f_uvc_opts *opts;
+ int ret = 0;
+
+ mutex_lock(su_mutex); /* for navigating configfs hierarchy */
+
+ /* Validate that the target is an entry in strings/<langid> */
+ strings = config_group_find_item(to_config_group(src->ci_parent->ci_parent),
+ "strings");
+ if (!strings || tgt->ci_parent->ci_parent != strings) {
+ ret = -EINVAL;
+ goto put_strings;
+ }
+
+ string = to_gadget_string(tgt);
+
+ opts = to_f_uvc_opts(src);
+ mutex_lock(&opts->lock);
+
+ if (!strcmp(tgt->ci_name, "iad_desc"))
+ opts->iad_index = string->usb_string.id;
+ else if (!strcmp(tgt->ci_name, "vs0_desc"))
+ opts->vs0_index = string->usb_string.id;
+ else if (!strcmp(tgt->ci_name, "vs1_desc"))
+ opts->vs1_index = string->usb_string.id;
+ else
+ ret = -EINVAL;
+
+ mutex_unlock(&opts->lock);
+
+put_strings:
+ config_item_put(strings);
+ mutex_unlock(su_mutex);
+
+ return ret;
+}
+
+static void uvc_func_drop_link(struct config_item *src, struct config_item *tgt)
+{
+ struct f_uvc_opts *opts;
+
+ opts = to_f_uvc_opts(src);
+ mutex_lock(&opts->lock);
+
+ if (!strcmp(tgt->ci_name, "iad_desc"))
+ opts->iad_index = 0;
+ else if (!strcmp(tgt->ci_name, "vs0_desc"))
+ opts->vs0_index = 0;
+ else if (!strcmp(tgt->ci_name, "vs1_desc"))
+ opts->vs1_index = 0;
+
+ mutex_unlock(&opts->lock);
+}
+
static struct configfs_item_operations uvc_func_item_ops = {
.release = uvc_func_item_release,
+ .allow_link = uvc_func_allow_link,
+ .drop_link = uvc_func_drop_link,
};
#define UVCG_OPTS_ATTR(cname, aname, limit) \
Currently the string descriptors for the IAD and VideoStreaming Interfaces are hardcoded into f_uvc. Now that we can create arbitrary string descriptors, add a mechanism to define string descriptors for the IAD, VC and VS interfaces by linking to the appropriate directory at function level. Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> --- Changes in v4: - None Changes in v3: - Changed target of link to be within <gadget root>/strings - Dropped the VideoControl description since there's an attribute for that now Changes in v2: - New patch drivers/usb/gadget/function/u_uvc.h | 8 +++ drivers/usb/gadget/function/uvc_configfs.c | 60 ++++++++++++++++++++++ 2 files changed, 68 insertions(+)