From 8627f8f4dfa06acd2b52db0b02d4fbab767d0f25 Mon Sep 17 00:00:00 2001
From: Claudio Takahasi <claudio.takahasi@openbossa.org>
Date: Tue, 3 Jul 2012 15:42:58 -0300
Subject: [PATCH] hog: Discover descriptors for all characteristics

"Report" characteristic has "Report Reference Characteristic" descriptor and
"Client Characteristic Configuration" descriptor.
---
 input/hog_device.c | 56 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 55 insertions(+), 1 deletion(-)

diff --git a/input/hog_device.c b/input/hog_device.c
index 786bc1b1c..77fe47987 100644
--- a/input/hog_device.c
+++ b/input/hog_device.c
@@ -64,6 +64,55 @@ struct hog_device {
 
 static GSList *devices = NULL;
 
+static void discover_descriptor_cb(guint8 status, const guint8 *pdu,
+					guint16 len, gpointer user_data)
+{
+	struct report *report = user_data;
+	struct att_data_list *list;
+	uint8_t format;
+	int i;
+
+	if (status != 0) {
+		error("Discover all characteristic descriptors failed: %s",
+							att_ecode2str(status));
+		return;
+	}
+
+	list = dec_find_info_resp(pdu, len, &format);
+	if (list == NULL)
+		return;
+
+	if (format != 0x01)
+		goto done;
+
+	for (i = 0; i < list->num; i++) {
+		uint16_t uuid16;
+		uint8_t *value;
+
+		value = list->data[i];
+		uuid16 = att_get_u16(&value[2]);
+
+		DBG("%s descriptor: 0x%04x", report->decl->uuid, uuid16);
+	}
+
+done:
+	att_data_list_free(list);
+}
+
+static void discover_descriptor(GAttrib *attrib, struct gatt_char *chr,
+				struct gatt_char *next, gpointer user_data)
+{
+	uint16_t start, end;
+
+	start = chr->value_handle + 1;
+	end = (next ? next->handle - 1 : 0xffff);
+
+	if (start > end)
+		return;
+
+	gatt_find_info(attrib, start, end, discover_descriptor_cb, user_data);
+}
+
 static void char_discovered_cb(GSList *chars, guint8 status, gpointer user_data)
 {
 	struct hog_device *hogdev = user_data;
@@ -80,9 +129,12 @@ static void char_discovered_cb(GSList *chars, guint8 status, gpointer user_data)
 	bt_uuid16_create(&report_uuid, HOG_REPORT_UUID);
 
 	for (l = chars; l; l = g_slist_next(l)) {
-		struct gatt_char *chr = l->data;
+		struct gatt_char *chr, *next;
 		bt_uuid_t uuid;
 
+		chr = l->data;
+		next = l->next ? l->next->data : NULL;
+
 		DBG("0x%04x UUID: %s properties: %02x",
 				chr->handle, chr->uuid, chr->properties);
 
@@ -94,6 +146,8 @@ static void char_discovered_cb(GSList *chars, guint8 status, gpointer user_data)
 		report = g_new0(struct report, 1);
 		report->decl = g_memdup(chr, sizeof(*chr));
 		hogdev->reports = g_slist_append(hogdev->reports, report);
+
+		discover_descriptor(hogdev->attrib, chr, next, hogdev);
 	}
 }