linux-kernel - [PATCH v4 2/4] HID: logitech: Support HID++ devices without short reports

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Date:   Fri, 11 Oct 2019 00:57:15 +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 2/4] HID: logitech: Support HID++ devices without short reports

On Saturday, October 5, 2019 9:04 PM, Mazin Rezk <mnrzk@...tonmail.com> wrote:

> This patch allows the hid-logitech-hidpp module to support devices that do
> not have support for Short HID++ reports. So far, it seems that Bluetooth
> HID++ 2.0 devices are missing short reports.

> This has been tested and confirmed with the MX Master and MX Master 2S and
> is therefore likely the case with the other Bluetooth devices.

No changes have been made to this patch in v4.

Signed-off-by: Mazin Rezk <mnrzk@...tonmail.com>
---
 drivers/hid/hid-logitech-hidpp.c | 37 ++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 85fd0c17cc2f..a0efa8a43213 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -71,6 +71,7 @@ MODULE_PARM_DESC(disable_tap_to_click,
 #define HIDPP_QUIRK_HIDPP_WHEELS		BIT(29)
 #define HIDPP_QUIRK_HIDPP_EXTRA_MOUSE_BTNS	BIT(30)
 #define HIDPP_QUIRK_HIDPP_CONSUMER_VENDOR_KEYS	BIT(31)
+#define HIDPP_QUIRK_CLASS_BLUETOOTH		BIT(5)

 /* These are just aliases for now */
 #define HIDPP_QUIRK_KBD_SCROLL_WHEEL HIDPP_QUIRK_HIDPP_WHEELS
@@ -81,6 +82,9 @@ MODULE_PARM_DESC(disable_tap_to_click,
 					 HIDPP_QUIRK_HI_RES_SCROLL_X2120 | \
 					 HIDPP_QUIRK_HI_RES_SCROLL_X2121)

+/* 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_DELAYED_INIT		HIDPP_QUIRK_NO_HIDINPUT

 #define HIDPP_CAPABILITY_HIDPP10_BATTERY	BIT(0)
@@ -340,6 +344,12 @@ static int hidpp_send_rap_command_sync(struct hidpp_device *hidpp_dev,
 	struct hidpp_report *message;
 	int ret, max_count;

+	/* Force long reports on devices that do not support short reports */
+	if (hidpp_dev->quirks & HIDPP_QUIRK_MISSING_SHORT_REPORTS &&
+	    report_id == REPORT_ID_HIDPP_SHORT)
+		report_id = REPORT_ID_HIDPP_LONG;
+
+
 	switch (report_id) {
 	case REPORT_ID_HIDPP_SHORT:
 		max_count = HIDPP_REPORT_SHORT_LENGTH - 4;
@@ -3482,6 +3492,12 @@ static bool hidpp_validate_report(struct hid_device *hdev, int id,

 static bool hidpp_validate_device(struct hid_device *hdev)
 {
+	struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+	/* Skip the short report check if the device does not support it */
+	if (hidpp->quirks & HIDPP_QUIRK_MISSING_SHORT_REPORTS)
+		return hidpp_validate_report(hdev, REPORT_ID_HIDPP_LONG,
+					     HIDPP_REPORT_LONG_LENGTH, false);
+
 	return hidpp_validate_report(hdev, REPORT_ID_HIDPP_SHORT,
 				     HIDPP_REPORT_SHORT_LENGTH, false) &&
 	       hidpp_validate_report(hdev, REPORT_ID_HIDPP_LONG,
@@ -3775,22 +3791,29 @@ static const struct hid_device_id hidpp_devices[] = {
 	  .driver_data = HIDPP_QUIRK_HIDPP_CONSUMER_VENDOR_KEYS },
 	{ /* MX Anywhere 2 mouse over Bluetooth */
 	  HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb013),
-	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 },
+	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+			 HIDPP_QUIRK_CLASS_BLUETOOTH },
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb018),
-	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 },
+	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+			 HIDPP_QUIRK_CLASS_BLUETOOTH },
 	{ /* MX Anywhere 2S mouse over Bluetooth */
 	  HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb01a),
-	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 },
+	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+			 HIDPP_QUIRK_CLASS_BLUETOOTH },
 	{ /* MX Master mouse over Bluetooth */
 	  HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb012),
-	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 },
+	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+			 HIDPP_QUIRK_CLASS_BLUETOOTH },
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb017),
-	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 },
+	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+			 HIDPP_QUIRK_CLASS_BLUETOOTH },
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb01e),
-	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 },
+	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+			 HIDPP_QUIRK_CLASS_BLUETOOTH },
 	{ /* MX Master 2S mouse over Bluetooth */
 	  HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb019),
-	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 },
+	  .driver_data = HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+			 HIDPP_QUIRK_CLASS_BLUETOOTH },
 	{}
 };

--
2.23.0