[PATCH AUTOSEL 4.14 3/8] HID: logitech-hidpp: Don't use the USB serial for USB devices
From: Sasha Levin <sashal@kernel.org>
Date: 2023-05-07 00:41:52
Also in:
lkml, stable
Subsystem:
hid core layer, hid logitech drivers, hid++ logitech drivers, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
From: Bastien Nocera <hadess@hadess.net> [ Upstream commit 7ad1fe0da0fa91bf920b79ab05ae97bfabecc4f4 ] For devices that support the 0x0003 feature (Device Information) version 4, set the serial based on the output of that feature, rather than relying on the usbhid code setting the USB serial. This should allow the serial when connected through USB to (nearly) match the one when connected through a unifying receiver. For example, on the serials on a G903 wired/wireless mouse: - Unifying: 4067-e8-ce-cd-45 - USB before patch: 017C385C3837 - USB after patch: c086-e8-ce-cd-45 Signed-off-by: Bastien Nocera <hadess@hadess.net> Link: https://lore.kernel.org/r/20230302130117.3975-1-hadess@hadess.net (local) Signed-off-by: Benjamin Tissoires <redacted> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/hid/hid-logitech-hidpp.c | 51 ++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+)
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 6ad776b4711b7..e2db4731eb825 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c@@ -777,6 +777,55 @@ static bool hidpp_is_connected(struct hidpp_device *hidpp) return ret == 0; } +/* -------------------------------------------------------------------------- */ +/* 0x0003: Device Information */ +/* -------------------------------------------------------------------------- */ + +#define HIDPP_PAGE_DEVICE_INFORMATION 0x0003 + +#define CMD_GET_DEVICE_INFO 0x00 + +static int hidpp_get_serial(struct hidpp_device *hidpp, u32 *serial) +{ + struct hidpp_report response; + u8 feature_type; + u8 feature_index; + int ret; + + ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_DEVICE_INFORMATION, + &feature_index, + &feature_type); + if (ret) + return ret; + + ret = hidpp_send_fap_command_sync(hidpp, feature_index, + CMD_GET_DEVICE_INFO, + NULL, 0, &response); + if (ret) + return ret; + + /* See hidpp_unifying_get_serial() */ + *serial = *((u32 *)&response.rap.params[1]); + return 0; +} + +static int hidpp_serial_init(struct hidpp_device *hidpp) +{ + struct hid_device *hdev = hidpp->hid_dev; + u32 serial; + int ret; + + ret = hidpp_get_serial(hidpp, &serial); + if (ret) + return ret; + + snprintf(hdev->uniq, sizeof(hdev->uniq), "%04x-%4phD", + hdev->product, &serial); + dbg_hid("HID++ DeviceInformation: Got serial: %s\n", hdev->uniq); + + return 0; +} + /* -------------------------------------------------------------------------- */ /* 0x0005: GetDeviceNameType */ /* -------------------------------------------------------------------------- */
@@ -3039,6 +3088,8 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id) if (hidpp->quirks & HIDPP_QUIRK_UNIFYING) hidpp_unifying_init(hidpp); + else if (hid_is_usb(hidpp->hid_dev)) + hidpp_serial_init(hidpp); connected = hidpp_is_connected(hidpp); atomic_set(&hidpp->connected, connected);
--
2.39.2