Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 815 insertions, 0 deletions

diff --git a/drivers/platform/x86/lg-laptop.c b/drivers/platform/x86/lg-laptop.c
new file mode 100644
index 000000000..ad3c39e9e
--- /dev/null
+++ b/drivers/platform/x86/lg-laptop.c
@@ -0,0 +1,815 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * lg-laptop.c - LG Gram ACPI features and hotkeys Driver
+ *
+ * Copyright (C) 2018 Matan Ziv-Av <matan@svgalib.org>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#include <acpi/battery.h>
+
+#define LED_DEVICE(_name, max, flag) struct led_classdev _name = { \
+	.name           = __stringify(_name),   \
+	.max_brightness = max,                  \
+	.brightness_set = _name##_set,          \
+	.brightness_get = _name##_get,          \
+	.flags = flag,                          \
+}
+
+MODULE_AUTHOR("Matan Ziv-Av");
+MODULE_DESCRIPTION("LG WMI Hotkey Driver");
+MODULE_LICENSE("GPL");
+
+#define WMI_EVENT_GUID0	"E4FB94F9-7F2B-4173-AD1A-CD1D95086248"
+#define WMI_EVENT_GUID1	"023B133E-49D1-4E10-B313-698220140DC2"
+#define WMI_EVENT_GUID2	"37BE1AC0-C3F2-4B1F-BFBE-8FDEAF2814D6"
+#define WMI_EVENT_GUID3	"911BAD44-7DF8-4FBB-9319-BABA1C4B293B"
+#define WMI_METHOD_WMAB "C3A72B38-D3EF-42D3-8CBB-D5A57049F66D"
+#define WMI_METHOD_WMBB "2B4F501A-BD3C-4394-8DCF-00A7D2BC8210"
+#define WMI_EVENT_GUID  WMI_EVENT_GUID0
+
+#define WMAB_METHOD     "\\XINI.WMAB"
+#define WMBB_METHOD     "\\XINI.WMBB"
+#define SB_GGOV_METHOD  "\\_SB.GGOV"
+#define GOV_TLED        0x2020008
+#define WM_GET          1
+#define WM_SET          2
+#define WM_KEY_LIGHT    0x400
+#define WM_TLED         0x404
+#define WM_FN_LOCK      0x407
+#define WM_BATT_LIMIT   0x61
+#define WM_READER_MODE  0xBF
+#define WM_FAN_MODE	0x33
+#define WMBB_USB_CHARGE 0x10B
+#define WMBB_BATT_LIMIT 0x10C
+
+#define PLATFORM_NAME   "lg-laptop"
+
+MODULE_ALIAS("wmi:" WMI_EVENT_GUID0);
+MODULE_ALIAS("wmi:" WMI_EVENT_GUID1);
+MODULE_ALIAS("wmi:" WMI_EVENT_GUID2);
+MODULE_ALIAS("wmi:" WMI_EVENT_GUID3);
+MODULE_ALIAS("wmi:" WMI_METHOD_WMAB);
+MODULE_ALIAS("wmi:" WMI_METHOD_WMBB);
+
+static struct platform_device *pf_device;
+static struct input_dev *wmi_input_dev;
+
+static u32 inited;
+#define INIT_INPUT_WMI_0        0x01
+#define INIT_INPUT_WMI_2        0x02
+#define INIT_INPUT_ACPI         0x04
+#define INIT_SPARSE_KEYMAP      0x80
+
+static int battery_limit_use_wmbb;
+static struct led_classdev kbd_backlight;
+static enum led_brightness get_kbd_backlight_level(void);
+
+static const struct key_entry wmi_keymap[] = {
+	{KE_KEY, 0x70, {KEY_F15} },	 /* LG control panel (F1) */
+	{KE_KEY, 0x74, {KEY_F21} },	 /* Touchpad toggle (F5) */
+	{KE_KEY, 0xf020000, {KEY_F14} }, /* Read mode (F9) */
+	{KE_KEY, 0x10000000, {KEY_F16} },/* Keyboard backlight (F8) - pressing
+					  * this key both sends an event and
+					  * changes backlight level.
+					  */
+	{KE_KEY, 0x80, {KEY_RFKILL} },
+	{KE_END, 0}
+};
+
+static int ggov(u32 arg0)
+{
+	union acpi_object args[1];
+	union acpi_object *r;
+	acpi_status status;
+	acpi_handle handle;
+	struct acpi_object_list arg;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	int res;
+
+	args[0].type = ACPI_TYPE_INTEGER;
+	args[0].integer.value = arg0;
+
+	status = acpi_get_handle(NULL, (acpi_string) SB_GGOV_METHOD, &handle);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Cannot get handle");
+		return -ENODEV;
+	}
+
+	arg.count = 1;
+	arg.pointer = args;
+
+	status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_err(handle, "GGOV: call failed.\n");
+		return -EINVAL;
+	}
+
+	r = buffer.pointer;
+	if (r->type != ACPI_TYPE_INTEGER) {
+		kfree(r);
+		return -EINVAL;
+	}
+
+	res = r->integer.value;
+	kfree(r);
+
+	return res;
+}
+
+static union acpi_object *lg_wmab(u32 method, u32 arg1, u32 arg2)
+{
+	union acpi_object args[3];
+	acpi_status status;
+	acpi_handle handle;
+	struct acpi_object_list arg;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+
+	args[0].type = ACPI_TYPE_INTEGER;
+	args[0].integer.value = method;
+	args[1].type = ACPI_TYPE_INTEGER;
+	args[1].integer.value = arg1;
+	args[2].type = ACPI_TYPE_INTEGER;
+	args[2].integer.value = arg2;
+
+	status = acpi_get_handle(NULL, (acpi_string) WMAB_METHOD, &handle);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Cannot get handle");
+		return NULL;
+	}
+
+	arg.count = 3;
+	arg.pointer = args;
+
+	status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_err(handle, "WMAB: call failed.\n");
+		return NULL;
+	}
+
+	return buffer.pointer;
+}
+
+static union acpi_object *lg_wmbb(u32 method_id, u32 arg1, u32 arg2)
+{
+	union acpi_object args[3];
+	acpi_status status;
+	acpi_handle handle;
+	struct acpi_object_list arg;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	u8 buf[32];
+
+	*(u32 *)buf = method_id;
+	*(u32 *)(buf + 4) = arg1;
+	*(u32 *)(buf + 16) = arg2;
+	args[0].type = ACPI_TYPE_INTEGER;
+	args[0].integer.value = 0; /* ignored */
+	args[1].type = ACPI_TYPE_INTEGER;
+	args[1].integer.value = 1; /* Must be 1 or 2. Does not matter which */
+	args[2].type = ACPI_TYPE_BUFFER;
+	args[2].buffer.length = 32;
+	args[2].buffer.pointer = buf;
+
+	status = acpi_get_handle(NULL, (acpi_string)WMBB_METHOD, &handle);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Cannot get handle");
+		return NULL;
+	}
+
+	arg.count = 3;
+	arg.pointer = args;
+
+	status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_err(handle, "WMAB: call failed.\n");
+		return NULL;
+	}
+
+	return (union acpi_object *)buffer.pointer;
+}
+
+static void wmi_notify(u32 value, void *context)
+{
+	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	acpi_status status;
+	long data = (long)context;
+
+	pr_debug("event guid %li\n", data);
+	status = wmi_get_event_data(value, &response);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Bad event status 0x%x\n", status);
+		return;
+	}
+
+	obj = (union acpi_object *)response.pointer;
+	if (!obj)
+		return;
+
+	if (obj->type == ACPI_TYPE_INTEGER) {
+		int eventcode = obj->integer.value;
+		struct key_entry *key;
+
+		if (eventcode == 0x10000000) {
+			led_classdev_notify_brightness_hw_changed(
+				&kbd_backlight, get_kbd_backlight_level());
+		} else {
+			key = sparse_keymap_entry_from_scancode(
+				wmi_input_dev, eventcode);
+			if (key && key->type == KE_KEY)
+				sparse_keymap_report_entry(wmi_input_dev,
+							   key, 1, true);
+		}
+	}
+
+	pr_debug("Type: %i    Eventcode: 0x%llx\n", obj->type,
+		 obj->integer.value);
+	kfree(response.pointer);
+}
+
+static void wmi_input_setup(void)
+{
+	acpi_status status;
+
+	wmi_input_dev = input_allocate_device();
+	if (wmi_input_dev) {
+		wmi_input_dev->name = "LG WMI hotkeys";
+		wmi_input_dev->phys = "wmi/input0";
+		wmi_input_dev->id.bustype = BUS_HOST;
+
+		if (sparse_keymap_setup(wmi_input_dev, wmi_keymap, NULL) ||
+		    input_register_device(wmi_input_dev)) {
+			pr_info("Cannot initialize input device");
+			input_free_device(wmi_input_dev);
+			return;
+		}
+
+		inited |= INIT_SPARSE_KEYMAP;
+		status = wmi_install_notify_handler(WMI_EVENT_GUID0, wmi_notify,
+						    (void *)0);
+		if (ACPI_SUCCESS(status))
+			inited |= INIT_INPUT_WMI_0;
+
+		status = wmi_install_notify_handler(WMI_EVENT_GUID2, wmi_notify,
+						    (void *)2);
+		if (ACPI_SUCCESS(status))
+			inited |= INIT_INPUT_WMI_2;
+	} else {
+		pr_info("Cannot allocate input device");
+	}
+}
+
+static void acpi_notify(struct acpi_device *device, u32 event)
+{
+	struct key_entry *key;
+
+	acpi_handle_debug(device->handle, "notify: %d\n", event);
+	if (inited & INIT_SPARSE_KEYMAP) {
+		key = sparse_keymap_entry_from_scancode(wmi_input_dev, 0x80);
+		if (key && key->type == KE_KEY)
+			sparse_keymap_report_entry(wmi_input_dev, key, 1, true);
+	}
+}
+
+static ssize_t fan_mode_store(struct device *dev,
+			      struct device_attribute *attr,
+			      const char *buffer, size_t count)
+{
+	bool value;
+	union acpi_object *r;
+	u32 m;
+	int ret;
+
+	ret = kstrtobool(buffer, &value);
+	if (ret)
+		return ret;
+
+	r = lg_wmab(WM_FAN_MODE, WM_GET, 0);
+	if (!r)
+		return -EIO;
+
+	if (r->type != ACPI_TYPE_INTEGER) {
+		kfree(r);
+		return -EIO;
+	}
+
+	m = r->integer.value;
+	kfree(r);
+	r = lg_wmab(WM_FAN_MODE, WM_SET, (m & 0xffffff0f) | (value << 4));
+	kfree(r);
+	r = lg_wmab(WM_FAN_MODE, WM_SET, (m & 0xfffffff0) | value);
+	kfree(r);
+
+	return count;
+}
+
+static ssize_t fan_mode_show(struct device *dev,
+			     struct device_attribute *attr, char *buffer)
+{
+	unsigned int status;
+	union acpi_object *r;
+
+	r = lg_wmab(WM_FAN_MODE, WM_GET, 0);
+	if (!r)
+		return -EIO;
+
+	if (r->type != ACPI_TYPE_INTEGER) {
+		kfree(r);
+		return -EIO;
+	}
+
+	status = r->integer.value & 0x01;
+	kfree(r);
+
+	return sysfs_emit(buffer, "%d\n", status);
+}
+
+static ssize_t usb_charge_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buffer, size_t count)
+{
+	bool value;
+	union acpi_object *r;
+	int ret;
+
+	ret = kstrtobool(buffer, &value);
+	if (ret)
+		return ret;
+
+	r = lg_wmbb(WMBB_USB_CHARGE, WM_SET, value);
+	if (!r)
+		return -EIO;
+
+	kfree(r);
+	return count;
+}
+
+static ssize_t usb_charge_show(struct device *dev,
+			       struct device_attribute *attr, char *buffer)
+{
+	unsigned int status;
+	union acpi_object *r;
+
+	r = lg_wmbb(WMBB_USB_CHARGE, WM_GET, 0);
+	if (!r)
+		return -EIO;
+
+	if (r->type != ACPI_TYPE_BUFFER) {
+		kfree(r);
+		return -EIO;
+	}
+
+	status = !!r->buffer.pointer[0x10];
+
+	kfree(r);
+
+	return sysfs_emit(buffer, "%d\n", status);
+}
+
+static ssize_t reader_mode_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buffer, size_t count)
+{
+	bool value;
+	union acpi_object *r;
+	int ret;
+
+	ret = kstrtobool(buffer, &value);
+	if (ret)
+		return ret;
+
+	r = lg_wmab(WM_READER_MODE, WM_SET, value);
+	if (!r)
+		return -EIO;
+
+	kfree(r);
+	return count;
+}
+
+static ssize_t reader_mode_show(struct device *dev,
+				struct device_attribute *attr, char *buffer)
+{
+	unsigned int status;
+	union acpi_object *r;
+
+	r = lg_wmab(WM_READER_MODE, WM_GET, 0);
+	if (!r)
+		return -EIO;
+
+	if (r->type != ACPI_TYPE_INTEGER) {
+		kfree(r);
+		return -EIO;
+	}
+
+	status = !!r->integer.value;
+
+	kfree(r);
+
+	return sysfs_emit(buffer, "%d\n", status);
+}
+
+static ssize_t fn_lock_store(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buffer, size_t count)
+{
+	bool value;
+	union acpi_object *r;
+	int ret;
+
+	ret = kstrtobool(buffer, &value);
+	if (ret)
+		return ret;
+
+	r = lg_wmab(WM_FN_LOCK, WM_SET, value);
+	if (!r)
+		return -EIO;
+
+	kfree(r);
+	return count;
+}
+
+static ssize_t fn_lock_show(struct device *dev,
+			    struct device_attribute *attr, char *buffer)
+{
+	unsigned int status;
+	union acpi_object *r;
+
+	r = lg_wmab(WM_FN_LOCK, WM_GET, 0);
+	if (!r)
+		return -EIO;
+
+	if (r->type != ACPI_TYPE_BUFFER) {
+		kfree(r);
+		return -EIO;
+	}
+
+	status = !!r->buffer.pointer[0];
+	kfree(r);
+
+	return sysfs_emit(buffer, "%d\n", status);
+}
+
+static ssize_t charge_control_end_threshold_store(struct device *dev,
+						  struct device_attribute *attr,
+						  const char *buf, size_t count)
+{
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &value);
+	if (ret)
+		return ret;
+
+	if (value == 100 || value == 80) {
+		union acpi_object *r;
+
+		if (battery_limit_use_wmbb)
+			r = lg_wmbb(WMBB_BATT_LIMIT, WM_SET, value);
+		else
+			r = lg_wmab(WM_BATT_LIMIT, WM_SET, value);
+		if (!r)
+			return -EIO;
+
+		kfree(r);
+		return count;
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t charge_control_end_threshold_show(struct device *device,
+						 struct device_attribute *attr,
+						 char *buf)
+{
+	unsigned int status;
+	union acpi_object *r;
+
+	if (battery_limit_use_wmbb) {
+		r = lg_wmbb(WMBB_BATT_LIMIT, WM_GET, 0);
+		if (!r)
+			return -EIO;
+
+		if (r->type != ACPI_TYPE_BUFFER) {
+			kfree(r);
+			return -EIO;
+		}
+
+		status = r->buffer.pointer[0x10];
+	} else {
+		r = lg_wmab(WM_BATT_LIMIT, WM_GET, 0);
+		if (!r)
+			return -EIO;
+
+		if (r->type != ACPI_TYPE_INTEGER) {
+			kfree(r);
+			return -EIO;
+		}
+
+		status = r->integer.value;
+	}
+	kfree(r);
+	if (status != 80 && status != 100)
+		status = 0;
+
+	return sysfs_emit(buf, "%d\n", status);
+}
+
+static ssize_t battery_care_limit_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buffer)
+{
+	return charge_control_end_threshold_show(dev, attr, buffer);
+}
+
+static ssize_t battery_care_limit_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buffer, size_t count)
+{
+	return charge_control_end_threshold_store(dev, attr, buffer, count);
+}
+
+static DEVICE_ATTR_RW(fan_mode);
+static DEVICE_ATTR_RW(usb_charge);
+static DEVICE_ATTR_RW(reader_mode);
+static DEVICE_ATTR_RW(fn_lock);
+static DEVICE_ATTR_RW(charge_control_end_threshold);
+static DEVICE_ATTR_RW(battery_care_limit);
+
+static int lg_battery_add(struct power_supply *battery, struct acpi_battery_hook *hook)
+{
+	if (device_create_file(&battery->dev,
+			       &dev_attr_charge_control_end_threshold))
+		return -ENODEV;
+
+	return 0;
+}
+
+static int lg_battery_remove(struct power_supply *battery, struct acpi_battery_hook *hook)
+{
+	device_remove_file(&battery->dev,
+			   &dev_attr_charge_control_end_threshold);
+	return 0;
+}
+
+static struct acpi_battery_hook battery_hook = {
+	.add_battery = lg_battery_add,
+	.remove_battery = lg_battery_remove,
+	.name = "LG Battery Extension",
+};
+
+static struct attribute *dev_attributes[] = {
+	&dev_attr_fan_mode.attr,
+	&dev_attr_usb_charge.attr,
+	&dev_attr_reader_mode.attr,
+	&dev_attr_fn_lock.attr,
+	&dev_attr_battery_care_limit.attr,
+	NULL
+};
+
+static const struct attribute_group dev_attribute_group = {
+	.attrs = dev_attributes,
+};
+
+static void tpad_led_set(struct led_classdev *cdev,
+			 enum led_brightness brightness)
+{
+	union acpi_object *r;
+
+	r = lg_wmab(WM_TLED, WM_SET, brightness > LED_OFF);
+	kfree(r);
+}
+
+static enum led_brightness tpad_led_get(struct led_classdev *cdev)
+{
+	return ggov(GOV_TLED) > 0 ? LED_ON : LED_OFF;
+}
+
+static LED_DEVICE(tpad_led, 1, 0);
+
+static void kbd_backlight_set(struct led_classdev *cdev,
+			      enum led_brightness brightness)
+{
+	u32 val;
+	union acpi_object *r;
+
+	val = 0x22;
+	if (brightness <= LED_OFF)
+		val = 0;
+	if (brightness >= LED_FULL)
+		val = 0x24;
+	r = lg_wmab(WM_KEY_LIGHT, WM_SET, val);
+	kfree(r);
+}
+
+static enum led_brightness get_kbd_backlight_level(void)
+{
+	union acpi_object *r;
+	int val;
+
+	r = lg_wmab(WM_KEY_LIGHT, WM_GET, 0);
+
+	if (!r)
+		return LED_OFF;
+
+	if (r->type != ACPI_TYPE_BUFFER || r->buffer.pointer[1] != 0x05) {
+		kfree(r);
+		return LED_OFF;
+	}
+
+	switch (r->buffer.pointer[0] & 0x27) {
+	case 0x24:
+		val = LED_FULL;
+		break;
+	case 0x22:
+		val = LED_HALF;
+		break;
+	default:
+		val = LED_OFF;
+	}
+
+	kfree(r);
+
+	return val;
+}
+
+static enum led_brightness kbd_backlight_get(struct led_classdev *cdev)
+{
+	return get_kbd_backlight_level();
+}
+
+static LED_DEVICE(kbd_backlight, 255, LED_BRIGHT_HW_CHANGED);
+
+static void wmi_input_destroy(void)
+{
+	if (inited & INIT_INPUT_WMI_2)
+		wmi_remove_notify_handler(WMI_EVENT_GUID2);
+
+	if (inited & INIT_INPUT_WMI_0)
+		wmi_remove_notify_handler(WMI_EVENT_GUID0);
+
+	if (inited & INIT_SPARSE_KEYMAP)
+		input_unregister_device(wmi_input_dev);
+
+	inited &= ~(INIT_INPUT_WMI_0 | INIT_INPUT_WMI_2 | INIT_SPARSE_KEYMAP);
+}
+
+static struct platform_driver pf_driver = {
+	.driver = {
+		   .name = PLATFORM_NAME,
+	}
+};
+
+static int acpi_add(struct acpi_device *device)
+{
+	int ret;
+	const char *product;
+	int year = 2017;
+
+	if (pf_device)
+		return 0;
+
+	ret = platform_driver_register(&pf_driver);
+	if (ret)
+		return ret;
+
+	pf_device = platform_device_register_simple(PLATFORM_NAME,
+						    PLATFORM_DEVID_NONE,
+						    NULL, 0);
+	if (IS_ERR(pf_device)) {
+		ret = PTR_ERR(pf_device);
+		pf_device = NULL;
+		pr_err("unable to register platform device\n");
+		goto out_platform_registered;
+	}
+	product = dmi_get_system_info(DMI_PRODUCT_NAME);
+	if (product && strlen(product) > 4)
+		switch (product[4]) {
+		case '5':
+			if (strlen(product) > 5)
+				switch (product[5]) {
+				case 'N':
+					year = 2021;
+					break;
+				case '0':
+					year = 2016;
+					break;
+				default:
+					year = 2022;
+				}
+			break;
+		case '6':
+			year = 2016;
+			break;
+		case '7':
+			year = 2017;
+			break;
+		case '8':
+			year = 2018;
+			break;
+		case '9':
+			year = 2019;
+			break;
+		case '0':
+			if (strlen(product) > 5)
+				switch (product[5]) {
+				case 'N':
+					year = 2020;
+					break;
+				case 'P':
+					year = 2021;
+					break;
+				default:
+					year = 2022;
+				}
+			break;
+		default:
+			year = 2019;
+		}
+	pr_info("product: %s  year: %d\n", product, year);
+
+	if (year >= 2019)
+		battery_limit_use_wmbb = 1;
+
+	ret = sysfs_create_group(&pf_device->dev.kobj, &dev_attribute_group);
+	if (ret)
+		goto out_platform_device;
+
+	/* LEDs are optional */
+	led_classdev_register(&pf_device->dev, &kbd_backlight);
+	led_classdev_register(&pf_device->dev, &tpad_led);
+
+	wmi_input_setup();
+	battery_hook_register(&battery_hook);
+
+	return 0;
+
+out_platform_device:
+	platform_device_unregister(pf_device);
+out_platform_registered:
+	platform_driver_unregister(&pf_driver);
+	return ret;
+}
+
+static void acpi_remove(struct acpi_device *device)
+{
+	sysfs_remove_group(&pf_device->dev.kobj, &dev_attribute_group);
+
+	led_classdev_unregister(&tpad_led);
+	led_classdev_unregister(&kbd_backlight);
+
+	battery_hook_unregister(&battery_hook);
+	wmi_input_destroy();
+	platform_device_unregister(pf_device);
+	pf_device = NULL;
+	platform_driver_unregister(&pf_driver);
+}
+
+static const struct acpi_device_id device_ids[] = {
+	{"LGEX0815", 0},
+	{"", 0}
+};
+MODULE_DEVICE_TABLE(acpi, device_ids);
+
+static struct acpi_driver acpi_driver = {
+	.name = "LG Gram Laptop Support",
+	.class = "lg-laptop",
+	.ids = device_ids,
+	.ops = {
+		.add = acpi_add,
+		.remove = acpi_remove,
+		.notify = acpi_notify,
+		},
+	.owner = THIS_MODULE,
+};
+
+static int __init acpi_init(void)
+{
+	int result;
+
+	result = acpi_bus_register_driver(&acpi_driver);
+	if (result < 0) {
+		pr_debug("Error registering driver\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void __exit acpi_exit(void)
+{
+	acpi_bus_unregister_driver(&acpi_driver);
+}
+
+module_init(acpi_init);
+module_exit(acpi_exit);