From e4f2f1a1eeafb37184245024dc6f3780c0296873 Mon Sep 17 00:00:00 2001
From: Claudio Takahasi <claudio.takahasi@openbossa.org>
Date: Fri, 17 Aug 2012 11:43:25 -0300
Subject: [PATCH] gatt: Add read Appearance characteristic

This patch registers the ATTIO callbacks, and triggers the Appearance
characteristic read by UUID when the ATT connection is established (if
appearance value is not found in the storage).
---
 profiles/gatt/gas.c | 69 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/profiles/gatt/gas.c b/profiles/gatt/gas.c
index d13eadc52..76db13078 100644
--- a/profiles/gatt/gas.c
+++ b/profiles/gatt/gas.c
@@ -31,6 +31,7 @@
 #include "device.h"
 #include "att.h"
 #include "gattrib.h"
+#include "attio.h"
 #include "gatt.h"
 #include "log.h"
 #include "gas.h"
@@ -40,12 +41,17 @@ struct gas {
 	struct btd_device *device;
 	struct att_range gap;	/* GAP Primary service range */
 	struct att_range gatt;	/* GATT Primary service range */
+	GAttrib *attrib;
+	guint attioid;
 };
 
 static GSList *devices = NULL;
 
 static void gas_free(struct gas *gas)
 {
+	if (gas->attioid)
+		btd_device_remove_attio_callback(gas->device, gas->attioid);
+
 	btd_device_unref(gas->device);
 	g_free(gas);
 }
@@ -58,6 +64,65 @@ static gint cmp_device(gconstpointer a, gconstpointer b)
 	return (gas->device == device ? 0 : -1);
 }
 
+static void gap_appearance_cb(guint8 status, const guint8 *pdu, guint16 plen,
+							gpointer user_data)
+{
+	struct att_data_list *list =  NULL;
+	uint16_t app;
+	uint8_t *atval;
+
+	if (status != 0) {
+		error("Read characteristics by UUID failed: %s",
+				att_ecode2str(status));
+		return;
+	}
+
+	list = dec_read_by_type_resp(pdu, plen);
+	if (list == NULL)
+		return;
+
+	if (list->len != 4) {
+		error("GAP Appearance value: invalid data");
+		goto done;
+	}
+
+	atval = list->data[0] + 2; /* skip handle value */
+	app = att_get_u16(atval);
+
+	DBG("GAP Appearance: 0x%04x", app);
+
+done:
+	att_data_list_free(list);
+}
+
+static void attio_connected_cb(GAttrib *attrib, gpointer user_data)
+{
+	struct gas *gas = user_data;
+	uint16_t app;
+
+	gas->attrib = g_attrib_ref(attrib);
+
+	if (device_get_appearance(gas->device, &app) < 0) {
+		bt_uuid_t uuid;
+
+		bt_uuid16_create(&uuid, GATT_CHARAC_APPEARANCE);
+
+		gatt_read_char_by_uuid(gas->attrib, gas->gap.start,
+						gas->gap.end, &uuid,
+						gap_appearance_cb, gas);
+	}
+
+	/* TODO: Read other GAP characteristics - See Core spec page 1739 */
+}
+
+static void attio_disconnected_cb(gpointer user_data)
+{
+	struct gas *gas = user_data;
+
+	g_attrib_unref(gas->attrib);
+	gas->attrib = NULL;
+}
+
 int gas_register(struct btd_device *device, struct att_range *gap,
 						struct att_range *gatt)
 {
@@ -73,6 +138,10 @@ int gas_register(struct btd_device *device, struct att_range *gap,
 
 	devices = g_slist_append(devices, gas);
 
+	gas->attioid = btd_device_add_attio_callback(device,
+						attio_connected_cb,
+						attio_disconnected_cb, gas);
+
 	return 0;
 }
 
-- 
2.47.3