Re: [PATCH v2 03/13] HID: playstation: add DualSense battery support.

From: Roderick Colenbrander <roderick.colenbrander@sony.com>

Report DualSense battery status information through power_supply class.

Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
[...]

@@ -21,6 +21,13 @@
 /* Base class for playstation devices. */
 struct ps_device {
 	struct hid_device *hdev;
+	spinlock_t lock;

+
+	struct power_supply_desc battery_desc;
+	struct power_supply *battery;
+	uint8_t battery_capacity;
+	int battery_status;
+
 	uint8_t mac_address[6];

 	int (*parse_report)(struct ps_device *dev, struct hid_report *report, u8 *data, int size);
[...]

@@ -136,6 +148,71 @@  static struct input_dev *ps_allocate_input_dev(struct hid_device *hdev, const ch
 	return input_dev;
 }

+static enum power_supply_property ps_power_supply_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_SCOPE

+};
[...]

@@ -201,7 +278,9 @@  static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *r
 	struct hid_device *hdev = ps_dev->hdev;
 	struct dualsense *ds = container_of(ps_dev, struct dualsense, base);
 	struct dualsense_input_report *ds_report;
-	uint8_t value;
+	uint8_t battery_data, battery_capacity, charging_status, value;
+	int battery_status;
+	unsigned long flags;

 	/* DualSense in USB uses the full HID report for reportID 1, but
 	 * Bluetooth uses a minimal HID report for reportID 1 and reports

@@ -242,12 +321,48 @@  static int dualsense_parse_report(struct ps_device *ps_dev, struct hid_report *r
 	input_report_key(ds->gamepad, BTN_MODE,   ds_report->buttons[2] & DS_BUTTONS2_PS_HOME);
 	input_sync(ds->gamepad);

+	battery_data = ds_report->status & DS_STATUS_BATTERY_CAPACITY;
+	charging_status = (ds_report->status & DS_STATUS_CHARGING) >> DS_STATUS_CHARGING_SHIFT;
+
+	switch (charging_status) {
+	case 0x0:
+		/* Each unit of battery data corresponds to 10%
+		 * 0 = 0-9%, 1 = 10-19%, .. and 10 = 100%
+		 */
+		battery_capacity = battery_data == 10 ? 100 : battery_data * 10 + 5;

+		battery_status = POWER_SUPPLY_STATUS_DISCHARGING;
+		break;
+	case 0x1:
+		battery_capacity = battery_data == 10 ? 100 : battery_data * 10 + 5;
+		battery_status = POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	case 0x2:
+		battery_capacity = 100;
+		battery_status = POWER_SUPPLY_STATUS_FULL;
+		break;
+	case 0xa: /* voltage or temperature out of range */
+	case 0xb: /* temperature error */
+		battery_capacity = 0;
+		battery_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		break;
+	case 0xf: /* charging error */
+	default:
+		battery_capacity = 0;
+		battery_status = POWER_SUPPLY_STATUS_UNKNOWN;
+	}
+
+	spin_lock_irqsave(&ps_dev->lock, flags);
+	ps_dev->battery_capacity = battery_capacity;
+	ps_dev->battery_status = battery_status;
+	spin_unlock_irqrestore(&ps_dev->lock, flags);
+
 	return 0;
 }

 static struct ps_device *dualsense_create(struct hid_device *hdev)
 {
 	struct dualsense *ds;
+	struct ps_device *ps_dev;
 	int ret;

 	ds = devm_kzalloc(&hdev->dev, sizeof(*ds), GFP_KERNEL);

@@ -259,8 +374,11 @@  static struct ps_device *dualsense_create(struct hid_device *hdev)
 	 */
 	hdev->version |= HID_PLAYSTATION_VERSION_PATCH;

-	ds->base.hdev = hdev;
-	ds->base.parse_report = dualsense_parse_report;
+	ps_dev = &ds->base;
+	ps_dev->hdev = hdev;
+	ps_dev->battery_capacity = 100; /* initial value until parse_report. */
+	ps_dev->battery_status = POWER_SUPPLY_STATUS_UNKNOWN;
+	ps_dev->parse_report = dualsense_parse_report;
 	hid_set_drvdata(hdev, ds);

 	ret = dualsense_get_mac_address(ds);

@@ -276,6 +394,10 @@  static struct ps_device *dualsense_create(struct hid_device *hdev)
 		goto err;
 	}

+	ret = ps_device_register_battery(ps_dev);
+	if (ret < 0)