linux-kernel - [PATCH v8 2/2] HID: logitech-hidpp: Support WirelessDeviceStatus connect events

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Message-ID: <8digbnSpZ_FnleD2ei0nz-dB_rb8IuSFeYLUimi3LnWfQeYriniOHIZM9GKGz2-NEMDgMSXG1XFhuqTKzUt818yNTkfCF5oVVpe6LsgYkWs=@protonmail.com>
Date:   Sun, 27 Oct 2019 17:44:13 +0000
From:   Mazin Rezk <mnrzk@...tonmail.com>
To:     "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        "jikos@...nel.org" <jikos@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Filipe Laíns <lains@...hlinux.org>,
        "adrian@...und.io" <adrian@...und.io>,
        "mnrzk@...tonmail.com" <mnrzk@...tonmail.com>
Subject: [PATCH v8 2/2] HID: logitech-hidpp: Support WirelessDeviceStatus connect events

This patch allows hidpp_report_is_connect_event to support
WirelessDeviceStatus connect events.

The WirelessDeviceStatus feature index is stored in hidpp_device when
probed. The connect event's fap feature_index is compared against it if the
device supports it.

Signed-off-by: Mazin Rezk <mnrzk@...tonmail.com>
---
 drivers/hid/hid-logitech-hidpp.c | 39 ++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 19b315e4e91b..c8b23568d0b1 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -191,6 +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 */
@@ -403,10 +405,13 @@ 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->wireless_feature_index &&
+		(report->fap.feature_index == hidpp->wireless_feature_index)) ||
+		((report->report_id == REPORT_ID_HIDPP_SHORT) &&
+		(report->rap.sub_id == 0x41));
 }

 /**
@@ -1283,6 +1288,24 @@ 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                                            */
 /* -------------------------------------------------------------------------- */
@@ -3078,7 +3101,7 @@ 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)
@@ -3628,6 +3651,14 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		hidpp_overwrite_name(hdev);
 	}

+	if (connected && hidpp->protocol_major >= 2) {
+		ret = hidpp_set_wireless_feature_index(hidpp);
+		if (ret == -ENOENT)
+			hidpp->wireless_feature_index = 0;
+		else 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