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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Thu, 2 Jul 2020 08:42:50 -0700
Message-ID: <CABBYNZK5SyZL6mx0D2dtRqz1P7m6+JZSBXMP-xRKjNBngf-oaA@mail.gmail.com>
Subject: Re: [PATCH v2] client: Add battery percentage to info command
To:     Sonny Sasaka <sonnysasaka@chromium.org>
Cc:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
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Sender: linux-bluetooth-owner@vger.kernel.org
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Hi Sonny,

On Wed, Jul 1, 2020 at 11:06 PM Sonny Sasaka <sonnysasaka@chromium.org> wrote:
>
> Hi Luiz,
>
> On Wed, Jul 1, 2020 at 10:20 PM Luiz Augusto von Dentz
> <luiz.dentz@gmail.com> wrote:
> >
> > Hi Sonny,
> >
> > On Wed, Jul 1, 2020 at 12:24 PM Sonny Sasaka <sonnysasaka@chromium.org> wrote:
> > >
> > > This adds the Battery Percentage to the info command based on
> > > org.bluez.Battery1 API. Example usage:
> > >
> > > [bluetooth]# info XX:XX:XX:XX:XX:XX
> > > Device XX:XX:XX:XX:XX:XX (random)
> > >         Name: ...
> > >         Alias: ...
> > >         ...
> > >         Modalias: ...
> > >         Battery Percentage: 100%
> > > ---
> > >  client/main.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 43 insertions(+)
> > >
> > > diff --git a/client/main.c b/client/main.c
> > > index 422da5593..4b787240e 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 +780,20 @@ 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;
> > > @@ -1606,8 +1637,10 @@ static struct GDBusProxy *find_device(int argc, char *argv[])
> > >  static void cmd_info(int argc, char *argv[])
> > >  {
> > >         GDBusProxy *proxy;
> > > +       GDBusProxy *battery_proxy;
> > >         DBusMessageIter iter;
> > >         const char *address;
> > > +       unsigned char percentage;
> > >
> > >         proxy = find_device(argc, argv);
> > >         if (!proxy)
> > > @@ -1647,6 +1680,16 @@ static void cmd_info(int argc, char *argv[])
> > >         print_property(proxy, "AdvertisingFlags");
> > >         print_property(proxy, "AdvertisingData");
> > >
> > > +       battery_proxy = find_battery_by_path(battery_proxies,
> > > +                                       g_dbus_proxy_get_path(proxy));
> >
> > I'd replace the lines below with just print_property(battery_proxy,
> > "Percentage"); and just make print_property check for NULL proxy if it
> > doesn't already.
> I tried this but the result doesn't look quite good:
> Device XX:XX:XX:XX:XX:XX (random)
>         Name: ...
>         ...
>         Modalias: ...
>         Percentage: 0x64
>
> The name "Percentage" is not clear (what kind of percentage does it
> mean) when shown in the "info" command. And also the format for byte
> data type is hex and there is no percent sign. I tried to modify the
> print_property function to support custom format but the code gets
> overly complex and I think it's more straightforward to use custom
> logic like in this patch.

Just make it always print both the decimal and (hex).

> >
> > > +       if (battery_proxy && g_dbus_proxy_get_property(
> > > +                               battery_proxy, "Percentage", &iter)) {
> > > +               dbus_message_iter_get_basic(&iter, &percentage);
> > > +               bt_shell_printf("\tBattery Percentage: %d%%\n", percentage);
> > > +       } else {
> > > +               bt_shell_printf("\tNo battery information\n");
> > > +       }
> > > +
> > >         return bt_shell_noninteractive_quit(EXIT_SUCCESS);
> > >  }
> > >
> > > --
> > > 2.17.1
> > >
> >
> >
> > --
> > Luiz Augusto von Dentz


-- 
Luiz Augusto von Dentz