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[81.224.151.184]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-69aa6dba523sm7512380a12.0.2026.07.11.17.31.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Jul 2026 17:31:17 -0700 (PDT) From: =?UTF-8?q?Erik=20H=C3=A5kansson?= To: jikos@kernel.org, bentiss@kernel.org Cc: lains@riseup.net, hadess@hadess.net, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Erik=20H=C3=A5kansson?= Subject: [PATCH 1/1] HID: logitech: add Bolt receiver support for Logitech HID++ devices Date: Sun, 12 Jul 2026 02:30:51 +0200 Message-ID: <20260712003051.338194-2-erikhakan@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260712003051.338194-1-erikhakan@gmail.com> References: <20260712003051.338194-1-erikhakan@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add Logitech Bolt receiver support to the Logitech HID receiver and HID++ drivers. Handle Bolt receiver notifications in hid-logitech-dj and add a Bolt-specific initialization path in hid-logitech-hidpp, separate from the existing Unifying receiver path. This allows Bolt-connected HID++ devices to expose battery information through the kernel power_supply path, so userspace tools can report their battery status with the correct device model. Tested with: - Logitech MX Keys for Business via Bolt receiver Signed-off-by: Erik Håkansson --- drivers/hid/hid-logitech-dj.c | 10 +++++++ drivers/hid/hid-logitech-hidpp.c | 48 ++++++++++++++++++++++++++++++-- 2 files changed, 55 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c index 9c574ab8b60b..518a9ee662b0 100644 --- a/drivers/hid/hid-logitech-dj.c +++ b/drivers/hid/hid-logitech-dj.c @@ -121,6 +121,7 @@ enum recvr_type { recvr_type_27mhz, recvr_type_bluetooth, recvr_type_dinovo, + recvr_type_bolt, }; struct dj_report { @@ -1156,6 +1157,10 @@ static void logi_hidpp_recv_queue_notif(struct hid_device *hdev, logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem); workitem.reports_supported |= STD_KEYBOARD; break; + case 0x10: + device_type = "Bolt"; + logi_hidpp_dev_conn_notif_equad(hdev, hidpp_report, &workitem); + break; } /* custom receiver device (eg. powerplay) */ @@ -1894,6 +1899,7 @@ static int logi_dj_probe(struct hid_device *hdev, case recvr_type_27mhz: no_dj_interfaces = 2; break; case recvr_type_bluetooth: no_dj_interfaces = 2; break; case recvr_type_dinovo: no_dj_interfaces = 2; break; + case recvr_type_bolt: no_dj_interfaces = 3; break; } if (hid_is_usb(hdev)) { intf = to_usb_interface(hdev->dev.parent); @@ -2103,6 +2109,10 @@ static const struct hid_device_id logi_dj_receivers[] = { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1_3), .driver_data = recvr_type_gaming_hidpp_ls_1_3}, + { /* Logitech Bolt receiver (0xc548) */ + HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, + USB_DEVICE_ID_LOGITECH_BOLT_RECEIVER), + .driver_data = recvr_type_bolt}, { /* Logitech lightspeed receiver (0xc54d) */ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_NANO_RECEIVER_LIGHTSPEED_1_4), diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index 90b0184df777..0b5d0a322ae8 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -4161,8 +4161,50 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp) return ret; } +static bool hidpp_is_bolt_child(struct hid_device *hdev) +{ + struct device *parent = hdev->dev.parent; + struct hid_device *receiver_hdev; + + if (!parent) + return false; + + receiver_hdev = to_hid_device(parent); + return receiver_hdev->vendor == USB_VENDOR_ID_LOGITECH && + receiver_hdev->product == USB_DEVICE_ID_LOGITECH_BOLT_RECEIVER; +} + +static int hidpp_bolt_init(struct hidpp_device *hidpp) +{ + struct hid_device *hdev = hidpp->hid_dev; + char *name; + int ret; + + ret = hidpp_serial_init(hidpp); + if (ret) + return ret; + + name = hidpp_get_device_name(hidpp); + if (!name) + return -EIO; + + snprintf(hdev->name, sizeof(hdev->name), "%s", name); + dbg_hid("HID++ Bolt: Got name: %s\n", name); + + kfree(name); + return 0; +} + +static int hidpp_receiver_init(struct hidpp_device *hidpp) +{ + if (hidpp_is_bolt_child(hidpp->hid_dev)) + return hidpp_bolt_init(hidpp); + + return hidpp_unifying_init(hidpp); +} + /* Get name + serial for USB and Bluetooth HID++ devices */ -static void hidpp_non_unifying_init(struct hidpp_device *hidpp) +static void hidpp_non_receiver_init(struct hidpp_device *hidpp) { struct hid_device *hdev = hidpp->hid_dev; char *name; @@ -4510,9 +4552,9 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id) /* Get name + serial, store in hdev->name + hdev->uniq */ if (id->group == HID_GROUP_LOGITECH_DJ_DEVICE) - hidpp_unifying_init(hidpp); + hidpp_receiver_init(hidpp); else - hidpp_non_unifying_init(hidpp); + hidpp_non_receiver_init(hidpp); if (hidpp->quirks & HIDPP_QUIRK_DELAYED_INIT) connect_mask &= ~HID_CONNECT_HIDINPUT; base-commit: 44696aa3a489d2baf58efa61b37833f100072bee -- 2.55.0