From: Johnson Tsai Date: Fri, 29 May 2026 07:50:32 +0000 (+0800) Subject: wifi: rtw89: usb: add serial_number and uuid sysfs attributes for 0x28de:0x2432 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=384cc80f30977d2ff095615f2241b21904499255;p=thirdparty%2Fkernel%2Fstable.git wifi: rtw89: usb: add serial_number and uuid sysfs attributes for 0x28de:0x2432 Expose the device's Serial Number (SN) and UUID from EFUSE via two read-only sysfs attributes, `serial_number` and `uuid`, on the ieee80211 phy device under the `rtw89_usb` attribute group. This hardware identification information is essential for user-space applications to uniquely identify, track, and manage specific Wi-Fi adapters. For example, in automated factory provisioning or device management systems, user-space tools rely on the EFUSE serial number and UUID to bind configurations to specific physical adapters. Currently, standard wireless APIs do not expose this low-level hardware information, making these sysfs nodes the only viable solution for user space to extract this data. The attributes are gated behind a new RTW89_QUIRK_HW_INFO_SYSFS quirk, enabled only for the VID 0x28de / PID 0x2432 device via the dev_id_quirks field in rtw89_driver_info. Example usage from user-space: $ cat /sys/class/ieee80211/phy0/rtw89_usb/serial_number 3642000123 $ cat /sys/class/ieee80211/phy0/rtw89_usb/uuid aaec2b7c-0a55-4727-8de0-b30febccbbaa Cc: Elliot Saba Cc: Charles Lohr Signed-off-by: Johnson Tsai Signed-off-by: Ping-Ke Shih Link: https://patch.msgid.link/20260529075032.16807-3-pkshih@realtek.com --- diff --git a/Documentation/ABI/testing/sysfs-class-ieee80211-rtw89 b/Documentation/ABI/testing/sysfs-class-ieee80211-rtw89 new file mode 100644 index 0000000000000..7dfdce08a42f3 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-ieee80211-rtw89 @@ -0,0 +1,24 @@ +What: /sys/class/ieee80211/phyX/rtw89_usb/serial_number +Date: May 2026 +Contact: Johnson Tsai , linux-wireless@vger.kernel.org +Description: (Read) Serial number burned into EFUSE of the RTL8852CU-based + USB Wi-Fi adapter. Only present on devices that set the + RTW89_QUIRK_HW_INFO_SYSFS quirk (currently VID 0x28de / + PID 0x2432). + + Format: %10phN (5 raw bytes printed as 10 lowercase hex + digits, no separators). + + Example: 3642000123 + +What: /sys/class/ieee80211/phyX/rtw89_usb/uuid +Date: May 2026 +Contact: Johnson Tsai , linux-wireless@vger.kernel.org +Description: (Read) UUID burned into EFUSE of the RTL8852CU-based USB Wi-Fi + adapter. Only present on devices that set the + RTW89_QUIRK_HW_INFO_SYSFS quirk (currently VID 0x28de / + PID 0x2432). + + Format: %pUb (RFC 4122 UUID in lowercase with hyphens). + + Example: aaec2b7c-0a55-4727-8de0-b30febccbbaa diff --git a/drivers/net/wireless/realtek/rtw89/core.h b/drivers/net/wireless/realtek/rtw89/core.h index 4c638c2bdc4f7..5547888d7e67a 100644 --- a/drivers/net/wireless/realtek/rtw89/core.h +++ b/drivers/net/wireless/realtek/rtw89/core.h @@ -3618,6 +3618,9 @@ struct rtw89_sta_link { u32 data_tx_cnt_lmt:6; }; +#define RTW89_EFUSE_SN_LEN 5 +#define RTW89_EFUSE_UUID_LEN 16 + struct rtw89_efuse { bool valid; bool power_k_valid; @@ -3628,6 +3631,8 @@ struct rtw89_efuse { u8 adc_td; u8 bt_setting_2; u8 bt_setting_3; + u8 sn[RTW89_EFUSE_SN_LEN]; + u8 uuid[RTW89_EFUSE_UUID_LEN]; }; struct rtw89_phy_rate_pattern { @@ -5376,6 +5381,7 @@ enum rtw89_quirks { RTW89_QUIRK_PCI_BER, RTW89_QUIRK_THERMAL_PROT_120C, RTW89_QUIRK_THERMAL_PROT_110C, + RTW89_QUIRK_HW_INFO_SYSFS, NUM_OF_RTW89_QUIRKS, }; diff --git a/drivers/net/wireless/realtek/rtw89/rtw8852c.c b/drivers/net/wireless/realtek/rtw89/rtw8852c.c index 7bb1264bcaef2..3861cce42b1ba 100644 --- a/drivers/net/wireless/realtek/rtw89/rtw8852c.c +++ b/drivers/net/wireless/realtek/rtw89/rtw8852c.c @@ -621,6 +621,15 @@ static void rtw8852c_efuse_parsing_gain_offset(struct rtw89_dev *rtwdev, gain->offset_valid = valid; } +static void rtw8852c_efuse_copy_sn_uuid_usb(struct rtw89_dev *rtwdev, + const struct rtw8852c_efuse *map) +{ + struct rtw89_efuse *efuse = &rtwdev->efuse; + + memcpy(efuse->sn, map->u.sn, sizeof(efuse->sn)); + memcpy(efuse->uuid, map->u.uuid, sizeof(efuse->uuid)); +} + static int rtw8852c_read_efuse(struct rtw89_dev *rtwdev, u8 *log_map, enum rtw89_efuse_block block) { @@ -640,6 +649,7 @@ static int rtw8852c_read_efuse(struct rtw89_dev *rtwdev, u8 *log_map, break; case RTW89_HCI_TYPE_USB: ether_addr_copy(efuse->addr, map->u.mac_addr); + rtw8852c_efuse_copy_sn_uuid_usb(rtwdev, map); break; default: return -ENOTSUPP; diff --git a/drivers/net/wireless/realtek/rtw89/rtw8852c.h b/drivers/net/wireless/realtek/rtw89/rtw8852c.h index 8585921ac6c4a..b1d7c354c18e5 100644 --- a/drivers/net/wireless/realtek/rtw89/rtw8852c.h +++ b/drivers/net/wireless/realtek/rtw89/rtw8852c.h @@ -13,7 +13,11 @@ struct rtw8852c_u_efuse { u8 rsvd[0x88]; u8 mac_addr[ETH_ALEN]; -}; + u8 rsvd1[8]; + u8 sn[RTW89_EFUSE_SN_LEN]; + u8 rsvd2[29]; + u8 uuid[RTW89_EFUSE_UUID_LEN]; +} __packed; struct rtw8852c_e_efuse { u8 mac_addr[ETH_ALEN]; diff --git a/drivers/net/wireless/realtek/rtw89/rtw8852cu.c b/drivers/net/wireless/realtek/rtw89/rtw8852cu.c index 8f89f9a314559..81ee96b0a0487 100644 --- a/drivers/net/wireless/realtek/rtw89/rtw8852cu.c +++ b/drivers/net/wireless/realtek/rtw89/rtw8852cu.c @@ -39,6 +39,16 @@ static const struct rtw89_driver_info rtw89_8852cu_info = { }, }; +static const struct rtw89_driver_info rtw89_8852cu_valve_info = { + .chip = &rtw8852c_chip_info, + .variant = NULL, + .quirks = NULL, + .dev_id_quirks = BIT(RTW89_QUIRK_HW_INFO_SYSFS), + .bus = { + .usb = &rtw8852c_usb_info, + }, +}; + static const struct usb_device_id rtw_8852cu_id_table[] = { { USB_DEVICE_AND_INTERFACE_INFO(0x0411, 0x03a6, 0xff, 0xff, 0xff), .driver_info = (kernel_ulong_t)&rtw89_8852cu_info }, @@ -53,7 +63,7 @@ static const struct usb_device_id rtw_8852cu_id_table[] = { { USB_DEVICE_AND_INTERFACE_INFO(0x0db0, 0x991d, 0xff, 0xff, 0xff), .driver_info = (kernel_ulong_t)&rtw89_8852cu_info }, { USB_DEVICE_AND_INTERFACE_INFO(0x28de, 0x2432, 0xff, 0xff, 0xff), - .driver_info = (kernel_ulong_t)&rtw89_8852cu_info }, + .driver_info = (kernel_ulong_t)&rtw89_8852cu_valve_info }, { USB_DEVICE_AND_INTERFACE_INFO(0x2c7c, 0x8206, 0xff, 0xff, 0xff), .driver_info = (kernel_ulong_t)&rtw89_8852cu_info }, { USB_DEVICE_AND_INTERFACE_INFO(0x35b2, 0x0502, 0xff, 0xff, 0xff), diff --git a/drivers/net/wireless/realtek/rtw89/usb.c b/drivers/net/wireless/realtek/rtw89/usb.c index 67ebf2d9bb7d1..aafa8b9e93dfc 100644 --- a/drivers/net/wireless/realtek/rtw89/usb.c +++ b/drivers/net/wireless/realtek/rtw89/usb.c @@ -1150,6 +1150,56 @@ static int rtw89_usb_switch_mode(struct rtw89_dev *rtwdev) return rtw89_usb_switch_mode_be(rtwdev); } +static ssize_t serial_number_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct wiphy *wiphy = container_of(dev, struct wiphy, dev); + struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy); + struct rtw89_dev *rtwdev = hw->priv; + struct rtw89_efuse *efuse = &rtwdev->efuse; + + return sysfs_emit(buf, "%*phN\n", + (int)sizeof(efuse->sn), efuse->sn); +} +static DEVICE_ATTR_RO(serial_number); + +static ssize_t uuid_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct wiphy *wiphy = container_of(dev, struct wiphy, dev); + struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy); + struct rtw89_dev *rtwdev = hw->priv; + struct rtw89_efuse *efuse = &rtwdev->efuse; + + return sysfs_emit(buf, "%pUb\n", efuse->uuid); +} +static DEVICE_ATTR_RO(uuid); + +static struct attribute *rtw89_usb_attrs[] = { + &dev_attr_serial_number.attr, + &dev_attr_uuid.attr, + NULL, +}; + +static bool rtw89_usb_group_visible(struct kobject *kobj) +{ + struct device *dev = kobj_to_dev(kobj); + struct wiphy *wiphy = container_of(dev, struct wiphy, dev); + struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy); + struct rtw89_dev *rtwdev = hw->priv; + + return test_bit(RTW89_QUIRK_HW_INFO_SYSFS, rtwdev->quirks); +} + +DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(rtw89_usb); + +static const struct attribute_group rtw89_usb_group = { + .name = "rtw89_usb", + .attrs = rtw89_usb_attrs, + .is_visible = SYSFS_GROUP_VISIBLE(rtw89_usb), +}; +__ATTRIBUTE_GROUPS(rtw89_usb); + int rtw89_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) { @@ -1171,6 +1221,8 @@ int rtw89_usb_probe(struct usb_interface *intf, rtwusb->rtwdev = rtwdev; rtwusb->info = info->bus.usb; + rtwdev->hw->wiphy->dev.groups = rtw89_usb_groups; + rtwdev->hci.ops = &rtw89_usb_ops; rtwdev->hci.type = RTW89_HCI_TYPE_USB; rtwdev->hci.tx_rpt_enabled = true;