linux: Work-around broken battery on the Onda v975w

Until https://bugzilla.kernel.org/show_bug.cgi?id=83941 is fixed,
this allow to have a bit more information than "0% battery" displayed in
the UI.

https://bugs.freedesktop.org/show_bug.cgi?id=90214

2 files changed, 45 insertions, 3 deletions

diff --git a/src/linux/integration-test b/src/linux/integration-test
index 4e5f13e..ad7152a 100755
--- a/src/linux/integration-test
+++ b/src/linux/integration-test
@@ -802,6 +802,33 @@ class Tests(unittest.TestCase):
         self.assertEqual(self.get_dbus_display_property('WarningLevel'), UP_DEVICE_LEVEL_NONE)
         self.stop_daemon()
 
+    def test_broken_onda_battery(self):
+        '''Onda v975w battery: https://bugzilla.kernel.org/show_bug.cgi?id=83941'''
+
+        batc = self.testbed.add_device('power_supply', 'BATC', None,
+                                       ['type', 'Battery',
+                                        'capacity', '0',
+                                        'capacity_level', 'Normal',
+                                        'present', '1',
+                                        'energy_full', '0',
+                                        'energy_full_design', '0',
+                                        'energy_now', '5549000',
+                                        'power_now', '97000',
+                                        'voltage_now', '3970000'], [])
+
+        self.start_daemon()
+        devs = self.proxy.EnumerateDevices()
+        self.assertEqual(len(devs), 1)
+        batc_up = devs[0]
+
+        self.assertEqual(self.get_dbus_dev_property(batc_up, 'Percentage'), 100.0)
+
+        self.testbed.set_attribute(batc, 'energy_now', '2774500')
+        time.sleep(5)
+        self.assertEqual(int(self.get_dbus_dev_property(batc_up, 'Percentage')), 50)
+
+        self.stop_daemon()
+
     #
     # libupower-glib tests (through introspection)
     #
diff --git a/src/linux/up-device-supply.c b/src/linux/up-device-supply.c
index 5d15083..1f86382 100644
--- a/src/linux/up-device-supply.c
+++ b/src/linux/up-device-supply.c
@@ -584,6 +584,16 @@ up_device_supply_refresh_battery (UpDeviceSupply *supply,
 			supply->priv->coldplug_units = UP_DEVICE_SUPPLY_COLDPLUG_UNITS_CHARGE;
 		}
 
+		/* Fix broken batteries without energy-full information */
+		if (energy_full < 0.01 && energy_full_design < 0.01) {
+			gdouble old_energy_full_design;
+
+			g_object_get (device, "energy-full-design", &old_energy_full_design, NULL);
+			energy_full_design = MAX(old_energy_full_design, energy);
+			/* Make following warning quiet */
+			energy_full = energy_full_design;
+		}
+
 		/* the last full should not be bigger than the design */
 		if (energy_full > energy_full_design)
 			g_warning ("energy_full (%f) is greater than energy_full_design (%f)",
@@ -679,9 +689,14 @@ up_device_supply_refresh_battery (UpDeviceSupply *supply,
         if (sysfs_file_exists (native_path, "capacity")) {
 		percentage = sysfs_get_double (native_path, "capacity");
 		percentage = CLAMP(percentage, 0.0f, 100.0f);
-                /* for devices which provide capacity, but not {energy,charge}_now */
-                if (energy < 0.1f && energy_full > 0.0f)
-                    energy = energy_full * percentage / 100;
+		/* for devices which provide capacity, but not {energy,charge}_now */
+		if (energy < 0.1f && energy_full > 0.0f) {
+			energy = energy_full * percentage / 100;
+		} else if (energy > 0.0f && percentage < 0.01) {
+			/* capacity isn't set but present */
+			percentage = 100.0 * energy / energy_full;
+			percentage = CLAMP(percentage, 0.0f, 100.0f);
+		}
         } else if (energy_full > 0.0f) {
 		percentage = 100.0 * energy / energy_full;
 		percentage = CLAMP(percentage, 0.0f, 100.0f);