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Date:   Fri, 11 Oct 2019 17:47:25 +0000
To:     "linux-input@vger.kernel.org" <linux-input@vger.kernel.org>
From:   Mazin Rezk <mnrzk@protonmail.com>
Cc:     "benjamin.tissoires@redhat.com" <benjamin.tissoires@redhat.com>,
        "jikos@kernel.org" <jikos@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        =?UTF-8?Q?Filipe_La=C3=ADns?= <lains@archlinux.org>,
        "mnrzk@protonmail.com" <mnrzk@protonmail.com>
Reply-To: Mazin Rezk <mnrzk@protonmail.com>
Subject: [PATCH v5 1/2] HID: logitech: Add MX Master over Bluetooth
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This patch adds support for the MX Master (b01e and b012) and also adds
foundational code for other Bluetooth LE HID++ devices to be added.

Some devices do not support short reports and thus have a quirk
(HIDPP_QUIRK_MISSING_SHORT_REPORTS) that forces short reports to be sent as
long reports. Since all Bluetooth LE HID++ devices seem to act this way,
HIDPP_QUIRK_CLASS_BLUETOOTH_LE aliases this quirk.

Signed-off-by: Mazin Rezk <mnrzk@protonmail.com>
---
 drivers/hid/hid-logitech-hidpp.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hi=
dpp.c
index 0179f7ed77e5..3692fb883602 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=09=09BIT(29)
 #define HIDPP_QUIRK_HIDPP_EXTRA_MOUSE_BTNS=09BIT(30)
 #define HIDPP_QUIRK_HIDPP_CONSUMER_VENDOR_KEYS=09BIT(31)
+#define HIDPP_QUIRK_MISSING_SHORT_REPORTS=09BIT(32)

 /* These are just aliases for now */
 #define HIDPP_QUIRK_KBD_SCROLL_WHEEL HIDPP_QUIRK_HIDPP_WHEELS
@@ -81,6 +82,8 @@ MODULE_PARM_DESC(disable_tap_to_click,
 =09=09=09=09=09 HIDPP_QUIRK_HI_RES_SCROLL_X2120 | \
 =09=09=09=09=09 HIDPP_QUIRK_HI_RES_SCROLL_X2121)

+#define HIDPP_QUIRK_CLASS_BLUETOOTH_LE=09HIDPP_QUIRK_MISSING_SHORT_REPORTS
+
 #define HIDPP_QUIRK_DELAYED_INIT=09=09HIDPP_QUIRK_NO_HIDINPUT

 #define HIDPP_CAPABILITY_HIDPP10_BATTERY=09BIT(0)
@@ -340,6 +343,12 @@ static int hidpp_send_rap_command_sync(struct hidpp_de=
vice *hidpp_dev,
 =09struct hidpp_report *message;
 =09int ret, max_count;

+=09/* Force long reports on devices that do not support short reports */
+=09if (hidpp_dev->quirks & HIDPP_QUIRK_MISSING_SHORT_REPORTS &&
+=09    report_id =3D=3D REPORT_ID_HIDPP_SHORT)
+=09=09report_id =3D REPORT_ID_HIDPP_LONG;
+
+
 =09switch (report_id) {
 =09case REPORT_ID_HIDPP_SHORT:
 =09=09max_count =3D HIDPP_REPORT_SHORT_LENGTH - 4;
@@ -3482,6 +3491,12 @@ static bool hidpp_validate_report(struct hid_device =
*hdev, int id,

 static bool hidpp_validate_device(struct hid_device *hdev)
 {
+=09struct hidpp_device *hidpp =3D hid_get_drvdata(hdev);
+=09/* Skip the short report check if the device does not support it */
+=09if (hidpp->quirks & HIDPP_QUIRK_MISSING_SHORT_REPORTS)
+=09=09return hidpp_validate_report(hdev, REPORT_ID_HIDPP_LONG,
+=09=09=09=09=09     HIDPP_REPORT_LONG_LENGTH, false);
+
 =09return hidpp_validate_report(hdev, REPORT_ID_HIDPP_SHORT,
 =09=09=09=09     HIDPP_REPORT_SHORT_LENGTH, false) &&
 =09       hidpp_validate_report(hdev, REPORT_ID_HIDPP_LONG,
@@ -3773,6 +3788,13 @@ static const struct hid_device_id hidpp_devices[] =
=3D {
 =09{ /* MX5500 keyboard over Bluetooth */
 =09  HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb30b),
 =09  .driver_data =3D HIDPP_QUIRK_HIDPP_CONSUMER_VENDOR_KEYS },
+=09{ /* MX Master mouse over Bluetooth */
+=09  HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb012),
+=09  .driver_data =3D HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+=09=09=09 HIDPP_QUIRK_CLASS_BLUETOOTH_LE },
+=09{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 0xb01e),
+=09  .driver_data =3D HIDPP_QUIRK_HI_RES_SCROLL_X2121 |
+=09=09=09 HIDPP_QUIRK_CLASS_BLUETOOTH_LE },
 =09{}
 };

--
2.23.0