linux-kernel - [PATCH v4 4/4] HID: logitech: Support WirelessDeviceStatus connect events

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Date:   Fri, 11 Oct 2019 00:57:56 +0000
From:   Mazin Rezk <mnrzk@...tonmail.com>
To:     "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
Cc:     "benjamin.tissoires@...hat.com" <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>,
        "mnrzk@...tonmail.com" <mnrzk@...tonmail.com>
Subject: [PATCH v4 4/4] HID: logitech: Support WirelessDeviceStatus connect events

On Saturday, October 5, 2019 9:05 PM, Mazin Rezk <mnrzk@...tonmail.com> wrote:

> This patch makes WirelessDeviceStatus (0x1d4b) events get detected as
> connection events on devices with HIDPP_QUIRK_WIRELESS_DEVICE_STATUS.
>
> This quirk is currently an alias for HIDPP_QUIRK_CLASS_BLUETOOTH since
> the added Bluetooth devices do not support regular connect events.

No changes have been made to this patch in v4.

Signed-off-by: Mazin Rezk <mnrzk@...tonmail.com>
---
 drivers/hid/hid-logitech-hidpp.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 2062be922c08..b2b5fe2c74db 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -84,6 +84,7 @@ MODULE_PARM_DESC(disable_tap_to_click,

 /* Just an alias for now, may possibly be a catch-all in the future */
 #define HIDPP_QUIRK_MISSING_SHORT_REPORTS	HIDPP_QUIRK_CLASS_BLUETOOTH
+#define HIDPP_QUIRK_WIRELESS_DEVICE_STATUS	HIDPP_QUIRK_CLASS_BLUETOOTH

 #define HIDPP_QUIRK_DELAYED_INIT		HIDPP_QUIRK_NO_HIDINPUT

@@ -406,9 +407,22 @@ 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)
+#define HIDPP_PAGE_WIRELESS_DEVICE_STATUS		0x1d4b
+
+static inline bool hidpp_report_is_connect_event(struct hidpp_device *hidpp,
+						 struct hidpp_report *report)
 {
-	return (report->report_id == REPORT_ID_HIDPP_SHORT) &&
+	if (hidpp->quirks & HIDPP_QUIRK_WIRELESS_DEVICE_STATUS) {
+		/* If feature is invalid, skip array check */
+		if (report->fap.feature_index > hidpp->feature_count)
+			return false;
+
+		return (hidpp->features[report->fap.feature_index] ==
+			 HIDPP_PAGE_WIRELESS_DEVICE_STATUS);
+	}
+
+	return ((report->report_id == REPORT_ID_HIDPP_SHORT) ||
+		(hidpp->quirks & HIDPP_QUIRK_MISSING_SHORT_REPORTS)) &&
 		(report->rap.sub_id == 0x41);
 }

@@ -3157,7 +3171,7 @@ 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)
--
2.23.0