[PATCH v6 2/2] HID: logitech: Support WirelessDeviceStatus connect events

[Mazin Rezk]

This patch allows WirelessDeviceStatus (0x1d4b) events to be detected as
connection events in the hid-logitech-hidpp module.

Devices with HIDPP_QUIRK_WIRELESS_DEVICE_STATUS use WirelessDeviceStatus
instead of traditional connect events. Since all Bluetooth LE devices seem
to act this way, HIDPP_QUIRK_CLASS_BLUETOOTH_LE aliases this quirk.

Signed-off-by: Mazin Rezk <mnrzk@xxxxxxxxxxxxxx>
---
 drivers/hid/hid-logitech-hidpp.c | 42 ++++++++++++++++++++++++++++----
 1 file changed, 37 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 997b1056850a..9b3df57ca857 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -60,6 +60,7 @@ MODULE_PARM_DESC(disable_tap_to_click,
 #define HIDPP_QUIRK_CLASS_K750			BIT(4)

 /* bits 2..15 are reserved for classes */
+#define HIDPP_QUIRK_WIRELESS_DEVICE_STATUS	BIT(19)
 #define HIDPP_QUIRK_MISSING_SHORT_REPORTS	BIT(20)
 /* #define HIDPP_QUIRK_CONNECT_EVENTS		BIT(21) disabled */
 #define HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS	BIT(22)
@@ -82,7 +83,8 @@ MODULE_PARM_DESC(disable_tap_to_click,
 					 HIDPP_QUIRK_HI_RES_SCROLL_X2120 | \
 					 HIDPP_QUIRK_HI_RES_SCROLL_X2121)

-#define HIDPP_QUIRK_CLASS_BLUETOOTH_LE	HIDPP_QUIRK_MISSING_SHORT_REPORTS
+#define HIDPP_QUIRK_CLASS_BLUETOOTH_LE	(HIDPP_QUIRK_MISSING_SHORT_REPORTS | \
+					 HIDPP_QUIRK_WIRELESS_DEVICE_STATUS)

 #define HIDPP_QUIRK_DELAYED_INIT		HIDPP_QUIRK_NO_HIDINPUT

@@ -189,6 +191,8 @@ struct hidpp_device {

 	struct hidpp_battery battery;
 	struct hidpp_scroll_counter vertical_wheel_counter;
+
+	u8 wireless_feature_index;
 };

 /* HID++ 1.0 error codes */
@@ -402,10 +406,14 @@ static inline bool hidpp_match_error(struct hidpp_report *question,
 	    (answer->fap.params[0] == question->fap.funcindex_clientid);
 }

-static inline bool hidpp_report_is_connect_event(struct hidpp_report *report)
+static inline bool hidpp_report_is_connect_event(struct hidpp_device *hidpp,
+						 struct hidpp_report *report)
 {
-	return (report->report_id == REPORT_ID_HIDPP_SHORT) &&
-		(report->rap.sub_id == 0x41);
+	return ((hidpp->quirks & HIDPP_QUIRK_WIRELESS_DEVICE_STATUS) &&
+		(report->fap.feature_index == hidpp->wireless_feature_index)) ||
+	      (((report->report_id == REPORT_ID_HIDPP_SHORT) ||
+		(hidpp->quirks & HIDPP_QUIRK_MISSING_SHORT_REPORTS)) &&
+		(report->rap.sub_id == 0x41));
 }

 /**
@@ -1282,6 +1290,24 @@ static int hidpp_battery_get_property(struct power_supply *psy,
 	return ret;
 }

+/* -------------------------------------------------------------------------- */
+/* 0x1d4b: Wireless device status                                             */
+/* -------------------------------------------------------------------------- */
+#define HIDPP_PAGE_WIRELESS_DEVICE_STATUS			0x1d4b
+
+static int hidpp_set_wireless_feature_index(struct hidpp_device *hidpp)
+{
+	u8 feature_type;
+	int ret;
+
+	ret = hidpp_root_get_feature(hidpp,
+				     HIDPP_PAGE_WIRELESS_DEVICE_STATUS,
+				     &hidpp->wireless_feature_index,
+				     &feature_type);
+
+	return ret;
+}
+
 /* -------------------------------------------------------------------------- */
 /* 0x2120: Hi-resolution scrolling                                            */
 /* -------------------------------------------------------------------------- */
@@ -3077,7 +3103,7 @@ static int hidpp_raw_hidpp_event(struct hidpp_device *hidpp, u8 *data,
 		}
 	}

-	if (unlikely(hidpp_report_is_connect_event(report))) {
+	if (unlikely(hidpp_report_is_connect_event(hidpp, report))) {
 		atomic_set(&hidpp->connected,
 				!(report->rap.params[0] & (1 << 6)));
 		if (schedule_work(&hidpp->work) == 0)
@@ -3624,6 +3650,12 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		hidpp_overwrite_name(hdev);
 	}

+	if (connected && (hidpp->quirks & HIDPP_QUIRK_WIRELESS_DEVICE_STATUS)) {
+		ret = hidpp_set_wireless_feature_index(hidpp);
+		if (ret)
+			goto hid_hw_init_fail;
+	}
+
 	if (connected && (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP)) {
 		ret = wtp_get_config(hidpp);
 		if (ret)
--
2.23.0