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From:   Sonny Sasaka <sonnysasaka@chromium.org>
To:     linux-bluetooth@vger.kernel.org
Cc:     Sonny Sasaka <sonnysasaka@chromium.org>
Subject: [PATCH 1/1] client: Add battery command
Date:   Tue, 30 Jun 2020 10:47:07 -0700
Message-Id: <20200630174707.214317-1-sonnysasaka@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-bluetooth-owner@vger.kernel.org
Precedence: bulk

This adds the "battery" command to show battery information of a peer
device based on org.bluez.Battery1 API. Example usage:

[bluetooth]# battery XX:XX:XX:XX:XX:XX
Percentage: 100%
---
 client/main.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/client/main.c b/client/main.c
index 422da5593..cc5eb7ce8 100644
--- a/client/main.c
+++ b/client/main.c
@@ -65,6 +65,7 @@ static struct adapter *default_ctrl;
 static GDBusProxy *default_dev;
 static GDBusProxy *default_attr;
 static GList *ctrl_list;
+static GList *battery_proxies;
 
 static const char *agent_arguments[] = {
 	"on",
@@ -107,7 +108,9 @@ static void disconnect_handler(DBusConnection *connection, void *user_data)
 	bt_shell_set_prompt(PROMPT_OFF);
 
 	g_list_free_full(ctrl_list, proxy_leak);
+	g_list_free_full(battery_proxies, proxy_leak);
 	ctrl_list = NULL;
+	battery_proxies = NULL;
 
 	default_ctrl = NULL;
 }
@@ -445,6 +448,16 @@ done:
 	g_free(desc);
 }
 
+static void battery_added(GDBusProxy *proxy)
+{
+	battery_proxies = g_list_append(battery_proxies, proxy);
+}
+
+static void battery_removed(GDBusProxy *proxy)
+{
+	battery_proxies = g_list_remove(battery_proxies, proxy);
+}
+
 static void device_added(GDBusProxy *proxy)
 {
 	DBusMessageIter iter;
@@ -539,6 +552,8 @@ static void proxy_added(GDBusProxy *proxy, void *user_data)
 		gatt_add_manager(proxy);
 	} else if (!strcmp(interface, "org.bluez.LEAdvertisingManager1")) {
 		ad_manager_added(proxy);
+	} else if (!strcmp(interface, "org.bluez.Battery1")) {
+		battery_added(proxy);
 	}
 }
 
@@ -630,6 +645,8 @@ static void proxy_removed(GDBusProxy *proxy, void *user_data)
 		gatt_remove_manager(proxy);
 	} else if (!strcmp(interface, "org.bluez.LEAdvertisingManager1")) {
 		ad_unregister(dbus_conn, NULL);
+	} else if (!strcmp(interface, "org.bluez.Battery1")) {
+		battery_removed(proxy);
 	}
 }
 
@@ -763,6 +780,19 @@ static struct adapter *find_ctrl_by_address(GList *source, const char *address)
 	return NULL;
 }
 
+static GDBusProxy *find_battery_by_path(GList *source, const char *path)
+{
+	GList *list;
+
+	for (list = g_list_first(source); list; list = g_list_next(list)) {
+		GDBusProxy *proxy = list->data;
+		if (strcmp(g_dbus_proxy_get_path(proxy), path) == 0)
+			return proxy;
+	}
+
+	return NULL;
+}
+
 static GDBusProxy *find_proxy_by_address(GList *source, const char *address)
 {
 	GList *list;
@@ -1650,6 +1680,35 @@ static void cmd_info(int argc, char *argv[])
 	return bt_shell_noninteractive_quit(EXIT_SUCCESS);
 }
 
+static void cmd_battery(int argc, char *argv[])
+{
+	DBusMessageIter iter;
+	GDBusProxy *device_proxy;
+	GDBusProxy *battery_proxy;
+	unsigned char percentage;
+
+	device_proxy = find_device(argc, argv);
+	if (!device_proxy)
+		return bt_shell_noninteractive_quit(EXIT_FAILURE);
+
+	battery_proxy = find_battery_by_path(battery_proxies,
+					g_dbus_proxy_get_path(device_proxy));
+	if (!battery_proxy) {
+		bt_shell_printf("Device %s does not have battery information\n",
+				argv[1]);
+		return bt_shell_noninteractive_quit(EXIT_FAILURE);
+	}
+
+	if (g_dbus_proxy_get_property(battery_proxy, "Percentage", &iter) ==
+									FALSE)
+		return bt_shell_noninteractive_quit(EXIT_FAILURE);
+
+	dbus_message_iter_get_basic(&iter, &percentage);
+	bt_shell_printf("Percentage: %d%%\n", percentage);
+
+	return bt_shell_noninteractive_quit(EXIT_SUCCESS);
+}
+
 static void pair_reply(DBusMessage *message, void *user_data)
 {
 	DBusError error;
@@ -2785,6 +2844,8 @@ static const struct bt_shell_menu main_menu = {
 							dev_generator },
 	{ "disconnect",   "[dev]",    cmd_disconn, "Disconnect device",
 							dev_generator },
+	{ "battery",      "[dev]",    cmd_battery, "Show device battery",
+							dev_generator },
 	{ } },
 };
 
-- 
2.26.2