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, 587 insertions, 0 deletions

diff --git a/drivers/platform/surface/surface3_power.c b/drivers/platform/surface/surface3_power.c
new file mode 100644
index 000000000..73961a24c
--- /dev/null
+++ b/drivers/platform/surface/surface3_power.c
@@ -0,0 +1,587 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Supports for the power IC on the Surface 3 tablet.
+ *
+ * (C) Copyright 2016-2018 Red Hat, Inc
+ * (C) Copyright 2016-2018 Benjamin Tissoires <benjamin.tissoires@gmail.com>
+ * (C) Copyright 2016 Stephen Just <stephenjust@gmail.com>
+ *
+ * This driver has been reverse-engineered by parsing the DSDT of the Surface 3
+ * and looking at the registers of the chips.
+ *
+ * The DSDT allowed to find out that:
+ * - the driver is required for the ACPI BAT0 device to communicate to the chip
+ *   through an operation region.
+ * - the various defines for the operation region functions to communicate with
+ *   this driver
+ * - the DSM 3f99e367-6220-4955-8b0f-06ef2ae79412 allows to trigger ACPI
+ *   events to BAT0 (the code is all available in the DSDT).
+ *
+ * Further findings regarding the 2 chips declared in the MSHW0011 are:
+ * - there are 2 chips declared:
+ *   . 0x22 seems to control the ADP1 line status (and probably the charger)
+ *   . 0x55 controls the battery directly
+ * - the battery chip uses a SMBus protocol (using plain SMBus allows non
+ *   destructive commands):
+ *   . the commands/registers used are in the range 0x00..0x7F
+ *   . if bit 8 (0x80) is set in the SMBus command, the returned value is the
+ *     same as when it is not set. There is a high chance this bit is the
+ *     read/write
+ *   . the various registers semantic as been deduced by observing the register
+ *     dumps.
+ */
+
+#include <linux/acpi.h>
+#include <linux/bits.h>
+#include <linux/freezer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uuid.h>
+#include <asm/unaligned.h>
+
+#define SURFACE_3_POLL_INTERVAL		(2 * HZ)
+#define SURFACE_3_STRLEN		10
+
+struct mshw0011_data {
+	struct i2c_client	*adp1;
+	struct i2c_client	*bat0;
+	unsigned short		notify_mask;
+	struct task_struct	*poll_task;
+	bool			kthread_running;
+
+	bool			charging;
+	bool			bat_charging;
+	u8			trip_point;
+	s32			full_capacity;
+};
+
+struct mshw0011_handler_data {
+	struct acpi_connection_info	info;
+	struct i2c_client		*client;
+};
+
+struct bix {
+	u32	revision;
+	u32	power_unit;
+	u32	design_capacity;
+	u32	last_full_charg_capacity;
+	u32	battery_technology;
+	u32	design_voltage;
+	u32	design_capacity_of_warning;
+	u32	design_capacity_of_low;
+	u32	cycle_count;
+	u32	measurement_accuracy;
+	u32	max_sampling_time;
+	u32	min_sampling_time;
+	u32	max_average_interval;
+	u32	min_average_interval;
+	u32	battery_capacity_granularity_1;
+	u32	battery_capacity_granularity_2;
+	char	model[SURFACE_3_STRLEN];
+	char	serial[SURFACE_3_STRLEN];
+	char	type[SURFACE_3_STRLEN];
+	char	OEM[SURFACE_3_STRLEN];
+} __packed;
+
+struct bst {
+	u32	battery_state;
+	s32	battery_present_rate;
+	u32	battery_remaining_capacity;
+	u32	battery_present_voltage;
+} __packed;
+
+struct gsb_command {
+	u8	arg0;
+	u8	arg1;
+	u8	arg2;
+} __packed;
+
+struct gsb_buffer {
+	u8	status;
+	u8	len;
+	u8	ret;
+	union {
+		struct gsb_command	cmd;
+		struct bst		bst;
+		struct bix		bix;
+	} __packed;
+} __packed;
+
+#define ACPI_BATTERY_STATE_DISCHARGING	BIT(0)
+#define ACPI_BATTERY_STATE_CHARGING	BIT(1)
+#define ACPI_BATTERY_STATE_CRITICAL	BIT(2)
+
+#define MSHW0011_CMD_DEST_BAT0		0x01
+#define MSHW0011_CMD_DEST_ADP1		0x03
+
+#define MSHW0011_CMD_BAT0_STA		0x01
+#define MSHW0011_CMD_BAT0_BIX		0x02
+#define MSHW0011_CMD_BAT0_BCT		0x03
+#define MSHW0011_CMD_BAT0_BTM		0x04
+#define MSHW0011_CMD_BAT0_BST		0x05
+#define MSHW0011_CMD_BAT0_BTP		0x06
+#define MSHW0011_CMD_ADP1_PSR		0x07
+#define MSHW0011_CMD_BAT0_PSOC		0x09
+#define MSHW0011_CMD_BAT0_PMAX		0x0a
+#define MSHW0011_CMD_BAT0_PSRC		0x0b
+#define MSHW0011_CMD_BAT0_CHGI		0x0c
+#define MSHW0011_CMD_BAT0_ARTG		0x0d
+
+#define MSHW0011_NOTIFY_GET_VERSION	0x00
+#define MSHW0011_NOTIFY_ADP1		0x01
+#define MSHW0011_NOTIFY_BAT0_BST	0x02
+#define MSHW0011_NOTIFY_BAT0_BIX	0x05
+
+#define MSHW0011_ADP1_REG_PSR		0x04
+
+#define MSHW0011_BAT0_REG_CAPACITY		0x0c
+#define MSHW0011_BAT0_REG_FULL_CHG_CAPACITY	0x0e
+#define MSHW0011_BAT0_REG_DESIGN_CAPACITY	0x40
+#define MSHW0011_BAT0_REG_VOLTAGE	0x08
+#define MSHW0011_BAT0_REG_RATE		0x14
+#define MSHW0011_BAT0_REG_OEM		0x45
+#define MSHW0011_BAT0_REG_TYPE		0x4e
+#define MSHW0011_BAT0_REG_SERIAL_NO	0x56
+#define MSHW0011_BAT0_REG_CYCLE_CNT	0x6e
+
+#define MSHW0011_EV_2_5_MASK		GENMASK(8, 0)
+
+/* 3f99e367-6220-4955-8b0f-06ef2ae79412 */
+static const guid_t mshw0011_guid =
+	GUID_INIT(0x3F99E367, 0x6220, 0x4955, 0x8B, 0x0F, 0x06, 0xEF,
+		  0x2A, 0xE7, 0x94, 0x12);
+
+static int
+mshw0011_notify(struct mshw0011_data *cdata, u8 arg1, u8 arg2,
+		unsigned int *ret_value)
+{
+	union acpi_object *obj;
+	acpi_handle handle;
+	unsigned int i;
+
+	handle = ACPI_HANDLE(&cdata->adp1->dev);
+	if (!handle)
+		return -ENODEV;
+
+	obj = acpi_evaluate_dsm_typed(handle, &mshw0011_guid, arg1, arg2, NULL,
+				      ACPI_TYPE_BUFFER);
+	if (!obj) {
+		dev_err(&cdata->adp1->dev, "device _DSM execution failed\n");
+		return -ENODEV;
+	}
+
+	*ret_value = 0;
+	for (i = 0; i < obj->buffer.length; i++)
+		*ret_value |= obj->buffer.pointer[i] << (i * 8);
+
+	ACPI_FREE(obj);
+	return 0;
+}
+
+static const struct bix default_bix = {
+	.revision = 0x00,
+	.power_unit = 0x01,
+	.design_capacity = 0x1dca,
+	.last_full_charg_capacity = 0x1dca,
+	.battery_technology = 0x01,
+	.design_voltage = 0x10df,
+	.design_capacity_of_warning = 0x8f,
+	.design_capacity_of_low = 0x47,
+	.cycle_count = 0xffffffff,
+	.measurement_accuracy = 0x00015f90,
+	.max_sampling_time = 0x03e8,
+	.min_sampling_time = 0x03e8,
+	.max_average_interval = 0x03e8,
+	.min_average_interval = 0x03e8,
+	.battery_capacity_granularity_1 = 0x45,
+	.battery_capacity_granularity_2 = 0x11,
+	.model = "P11G8M",
+	.serial = "",
+	.type = "LION",
+	.OEM = "",
+};
+
+static int mshw0011_bix(struct mshw0011_data *cdata, struct bix *bix)
+{
+	struct i2c_client *client = cdata->bat0;
+	char buf[SURFACE_3_STRLEN];
+	int ret;
+
+	*bix = default_bix;
+
+	/* get design capacity */
+	ret = i2c_smbus_read_word_data(client,
+				       MSHW0011_BAT0_REG_DESIGN_CAPACITY);
+	if (ret < 0) {
+		dev_err(&client->dev, "Error reading design capacity: %d\n",
+			ret);
+		return ret;
+	}
+	bix->design_capacity = ret;
+
+	/* get last full charge capacity */
+	ret = i2c_smbus_read_word_data(client,
+				       MSHW0011_BAT0_REG_FULL_CHG_CAPACITY);
+	if (ret < 0) {
+		dev_err(&client->dev,
+			"Error reading last full charge capacity: %d\n", ret);
+		return ret;
+	}
+	bix->last_full_charg_capacity = ret;
+
+	/*
+	 * Get serial number, on some devices (with unofficial replacement
+	 * battery?) reading any of the serial number range addresses gets
+	 * nacked in this case just leave the serial number empty.
+	 */
+	ret = i2c_smbus_read_i2c_block_data(client, MSHW0011_BAT0_REG_SERIAL_NO,
+					    sizeof(buf), buf);
+	if (ret == -EREMOTEIO) {
+		/* no serial number available */
+	} else if (ret != sizeof(buf)) {
+		dev_err(&client->dev, "Error reading serial no: %d\n", ret);
+		return ret;
+	} else {
+		snprintf(bix->serial, ARRAY_SIZE(bix->serial), "%3pE%6pE", buf + 7, buf);
+	}
+
+	/* get cycle count */
+	ret = i2c_smbus_read_word_data(client, MSHW0011_BAT0_REG_CYCLE_CNT);
+	if (ret < 0) {
+		dev_err(&client->dev, "Error reading cycle count: %d\n", ret);
+		return ret;
+	}
+	bix->cycle_count = ret;
+
+	/* get OEM name */
+	ret = i2c_smbus_read_i2c_block_data(client, MSHW0011_BAT0_REG_OEM,
+					    4, buf);
+	if (ret != 4) {
+		dev_err(&client->dev, "Error reading cycle count: %d\n", ret);
+		return ret;
+	}
+	snprintf(bix->OEM, ARRAY_SIZE(bix->OEM), "%3pE", buf);
+
+	return 0;
+}
+
+static int mshw0011_bst(struct mshw0011_data *cdata, struct bst *bst)
+{
+	struct i2c_client *client = cdata->bat0;
+	int rate, capacity, voltage, state;
+	s16 tmp;
+
+	rate = i2c_smbus_read_word_data(client, MSHW0011_BAT0_REG_RATE);
+	if (rate < 0)
+		return rate;
+
+	capacity = i2c_smbus_read_word_data(client, MSHW0011_BAT0_REG_CAPACITY);
+	if (capacity < 0)
+		return capacity;
+
+	voltage = i2c_smbus_read_word_data(client, MSHW0011_BAT0_REG_VOLTAGE);
+	if (voltage < 0)
+		return voltage;
+
+	tmp = rate;
+	bst->battery_present_rate = abs((s32)tmp);
+
+	state = 0;
+	if ((s32) tmp > 0)
+		state |= ACPI_BATTERY_STATE_CHARGING;
+	else if ((s32) tmp < 0)
+		state |= ACPI_BATTERY_STATE_DISCHARGING;
+	bst->battery_state = state;
+
+	bst->battery_remaining_capacity = capacity;
+	bst->battery_present_voltage = voltage;
+
+	return 0;
+}
+
+static int mshw0011_adp_psr(struct mshw0011_data *cdata)
+{
+	return i2c_smbus_read_byte_data(cdata->adp1, MSHW0011_ADP1_REG_PSR);
+}
+
+static int mshw0011_isr(struct mshw0011_data *cdata)
+{
+	struct bst bst;
+	struct bix bix;
+	int ret;
+	bool status, bat_status;
+
+	ret = mshw0011_adp_psr(cdata);
+	if (ret < 0)
+		return ret;
+
+	status = ret;
+	if (status != cdata->charging)
+		mshw0011_notify(cdata, cdata->notify_mask,
+				MSHW0011_NOTIFY_ADP1, &ret);
+
+	cdata->charging = status;
+
+	ret = mshw0011_bst(cdata, &bst);
+	if (ret < 0)
+		return ret;
+
+	bat_status = bst.battery_state;
+	if (bat_status != cdata->bat_charging)
+		mshw0011_notify(cdata, cdata->notify_mask,
+				MSHW0011_NOTIFY_BAT0_BST, &ret);
+
+	cdata->bat_charging = bat_status;
+
+	ret = mshw0011_bix(cdata, &bix);
+	if (ret < 0)
+		return ret;
+
+	if (bix.last_full_charg_capacity != cdata->full_capacity)
+		mshw0011_notify(cdata, cdata->notify_mask,
+				MSHW0011_NOTIFY_BAT0_BIX, &ret);
+
+	cdata->full_capacity = bix.last_full_charg_capacity;
+
+	return 0;
+}
+
+static int mshw0011_poll_task(void *data)
+{
+	struct mshw0011_data *cdata = data;
+	int ret = 0;
+
+	cdata->kthread_running = true;
+
+	set_freezable();
+
+	while (!kthread_should_stop()) {
+		schedule_timeout_interruptible(SURFACE_3_POLL_INTERVAL);
+		try_to_freeze();
+		ret = mshw0011_isr(data);
+		if (ret)
+			break;
+	}
+
+	cdata->kthread_running = false;
+	return ret;
+}
+
+static acpi_status
+mshw0011_space_handler(u32 function, acpi_physical_address command,
+			u32 bits, u64 *value64,
+			void *handler_context, void *region_context)
+{
+	struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
+	struct mshw0011_handler_data *data = handler_context;
+	struct acpi_connection_info *info = &data->info;
+	struct acpi_resource_i2c_serialbus *sb;
+	struct i2c_client *client = data->client;
+	struct mshw0011_data *cdata = i2c_get_clientdata(client);
+	struct acpi_resource *ares;
+	u32 accessor_type = function >> 16;
+	acpi_status ret;
+	int status = 1;
+
+	ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
+	if (ACPI_FAILURE(ret))
+		return ret;
+
+	if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) {
+		ret = AE_BAD_PARAMETER;
+		goto err;
+	}
+
+	if (accessor_type != ACPI_GSB_ACCESS_ATTRIB_RAW_PROCESS) {
+		ret = AE_BAD_PARAMETER;
+		goto err;
+	}
+
+	if (gsb->cmd.arg0 == MSHW0011_CMD_DEST_ADP1 &&
+	    gsb->cmd.arg1 == MSHW0011_CMD_ADP1_PSR) {
+		status = mshw0011_adp_psr(cdata);
+		if (status >= 0) {
+			ret = AE_OK;
+			goto out;
+		} else {
+			ret = AE_ERROR;
+			goto err;
+		}
+	}
+
+	if (gsb->cmd.arg0 != MSHW0011_CMD_DEST_BAT0) {
+		ret = AE_BAD_PARAMETER;
+		goto err;
+	}
+
+	switch (gsb->cmd.arg1) {
+	case MSHW0011_CMD_BAT0_STA:
+		break;
+	case MSHW0011_CMD_BAT0_BIX:
+		ret = mshw0011_bix(cdata, &gsb->bix);
+		break;
+	case MSHW0011_CMD_BAT0_BTP:
+		cdata->trip_point = gsb->cmd.arg2;
+		break;
+	case MSHW0011_CMD_BAT0_BST:
+		ret = mshw0011_bst(cdata, &gsb->bst);
+		break;
+	default:
+		dev_info(&cdata->bat0->dev, "command(0x%02x) is not supported.\n", gsb->cmd.arg1);
+		ret = AE_BAD_PARAMETER;
+		goto err;
+	}
+
+ out:
+	gsb->ret = status;
+	gsb->status = 0;
+
+ err:
+	ACPI_FREE(ares);
+	return ret;
+}
+
+static int mshw0011_install_space_handler(struct i2c_client *client)
+{
+	struct acpi_device *adev;
+	struct mshw0011_handler_data *data;
+	acpi_status status;
+
+	adev = ACPI_COMPANION(&client->dev);
+	if (!adev)
+		return -ENODEV;
+
+	data = kzalloc(sizeof(struct mshw0011_handler_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	status = acpi_bus_attach_private_data(adev->handle, (void *)data);
+	if (ACPI_FAILURE(status)) {
+		kfree(data);
+		return -ENOMEM;
+	}
+
+	status = acpi_install_address_space_handler(adev->handle,
+						    ACPI_ADR_SPACE_GSBUS,
+						    &mshw0011_space_handler,
+						    NULL,
+						    data);
+	if (ACPI_FAILURE(status)) {
+		dev_err(&client->dev, "Error installing i2c space handler\n");
+		acpi_bus_detach_private_data(adev->handle);
+		kfree(data);
+		return -ENOMEM;
+	}
+
+	acpi_dev_clear_dependencies(adev);
+	return 0;
+}
+
+static void mshw0011_remove_space_handler(struct i2c_client *client)
+{
+	struct mshw0011_handler_data *data;
+	acpi_handle handle;
+	acpi_status status;
+
+	handle = ACPI_HANDLE(&client->dev);
+	if (!handle)
+		return;
+
+	acpi_remove_address_space_handler(handle,
+				ACPI_ADR_SPACE_GSBUS,
+				&mshw0011_space_handler);
+
+	status = acpi_bus_get_private_data(handle, (void **)&data);
+	if (ACPI_SUCCESS(status))
+		kfree(data);
+
+	acpi_bus_detach_private_data(handle);
+}
+
+static int mshw0011_probe(struct i2c_client *client)
+{
+	struct i2c_board_info board_info;
+	struct device *dev = &client->dev;
+	struct i2c_client *bat0;
+	struct mshw0011_data *data;
+	int error, mask;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->adp1 = client;
+	i2c_set_clientdata(client, data);
+
+	memset(&board_info, 0, sizeof(board_info));
+	strscpy(board_info.type, "MSHW0011-bat0", I2C_NAME_SIZE);
+
+	bat0 = i2c_acpi_new_device(dev, 1, &board_info);
+	if (IS_ERR(bat0))
+		return PTR_ERR(bat0);
+
+	data->bat0 = bat0;
+	i2c_set_clientdata(bat0, data);
+
+	error = mshw0011_notify(data, 1, MSHW0011_NOTIFY_GET_VERSION, &mask);
+	if (error)
+		goto out_err;
+
+	data->notify_mask = mask == MSHW0011_EV_2_5_MASK;
+
+	data->poll_task = kthread_run(mshw0011_poll_task, data, "mshw0011_adp");
+	if (IS_ERR(data->poll_task)) {
+		error = PTR_ERR(data->poll_task);
+		dev_err(&client->dev, "Unable to run kthread err %d\n", error);
+		goto out_err;
+	}
+
+	error = mshw0011_install_space_handler(client);
+	if (error)
+		goto out_err;
+
+	return 0;
+
+out_err:
+	if (data->kthread_running)
+		kthread_stop(data->poll_task);
+	i2c_unregister_device(data->bat0);
+	return error;
+}
+
+static void mshw0011_remove(struct i2c_client *client)
+{
+	struct mshw0011_data *cdata = i2c_get_clientdata(client);
+
+	mshw0011_remove_space_handler(client);
+
+	if (cdata->kthread_running)
+		kthread_stop(cdata->poll_task);
+
+	i2c_unregister_device(cdata->bat0);
+}
+
+static const struct acpi_device_id mshw0011_acpi_match[] = {
+	{ "MSHW0011", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, mshw0011_acpi_match);
+
+static struct i2c_driver mshw0011_driver = {
+	.probe_new = mshw0011_probe,
+	.remove = mshw0011_remove,
+	.driver = {
+		.name = "mshw0011",
+		.acpi_match_table = mshw0011_acpi_match,
+	},
+};
+module_i2c_driver(mshw0011_driver);
+
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
+MODULE_DESCRIPTION("mshw0011 driver");
+MODULE_LICENSE("GPL v2");