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, 674 insertions, 0 deletions

diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c
new file mode 100644
index 000000000..e9b8e8305
--- /dev/null
+++ b/drivers/acpi/acpi_tad.c
@@ -0,0 +1,674 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ACPI Time and Alarm (TAD) Device Driver
+ *
+ * Copyright (C) 2018 Intel Corporation
+ * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ *
+ * This driver is based on Section 9.18 of the ACPI 6.2 specification revision.
+ *
+ * It only supports the system wakeup capabilities of the TAD.
+ *
+ * Provided are sysfs attributes, available under the TAD platform device,
+ * allowing user space to manage the AC and DC wakeup timers of the TAD:
+ * set and read their values, set and check their expire timer wake policies,
+ * check and clear their status and check the capabilities of the TAD reported
+ * by AML.  The DC timer attributes are only present if the TAD supports a
+ * separate DC alarm timer.
+ *
+ * The wakeup events handling and power management of the TAD is expected to
+ * be taken care of by the ACPI PM domain attached to its platform device.
+ */
+
+#include <linux/acpi.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/suspend.h>
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Rafael J. Wysocki");
+
+/* ACPI TAD capability flags (ACPI 6.2, Section 9.18.2) */
+#define ACPI_TAD_AC_WAKE	BIT(0)
+#define ACPI_TAD_DC_WAKE	BIT(1)
+#define ACPI_TAD_RT		BIT(2)
+#define ACPI_TAD_RT_IN_MS	BIT(3)
+#define ACPI_TAD_S4_S5__GWS	BIT(4)
+#define ACPI_TAD_AC_S4_WAKE	BIT(5)
+#define ACPI_TAD_AC_S5_WAKE	BIT(6)
+#define ACPI_TAD_DC_S4_WAKE	BIT(7)
+#define ACPI_TAD_DC_S5_WAKE	BIT(8)
+
+/* ACPI TAD alarm timer selection */
+#define ACPI_TAD_AC_TIMER	(u32)0
+#define ACPI_TAD_DC_TIMER	(u32)1
+
+/* Special value for disabled timer or expired timer wake policy. */
+#define ACPI_TAD_WAKE_DISABLED	(~(u32)0)
+
+struct acpi_tad_driver_data {
+	u32 capabilities;
+};
+
+struct acpi_tad_rt {
+	u16 year;  /* 1900 - 9999 */
+	u8 month;  /* 1 - 12 */
+	u8 day;    /* 1 - 31 */
+	u8 hour;   /* 0 - 23 */
+	u8 minute; /* 0 - 59 */
+	u8 second; /* 0 - 59 */
+	u8 valid;  /* 0 (failed) or 1 (success) for reads, 0 for writes */
+	u16 msec;  /* 1 - 1000 */
+	s16 tz;    /* -1440 to 1440 or 2047 (unspecified) */
+	u8 daylight;
+	u8 padding[3]; /* must be 0 */
+} __packed;
+
+static int acpi_tad_set_real_time(struct device *dev, struct acpi_tad_rt *rt)
+{
+	acpi_handle handle = ACPI_HANDLE(dev);
+	union acpi_object args[] = {
+		{ .type = ACPI_TYPE_BUFFER, },
+	};
+	struct acpi_object_list arg_list = {
+		.pointer = args,
+		.count = ARRAY_SIZE(args),
+	};
+	unsigned long long retval;
+	acpi_status status;
+
+	if (rt->year < 1900 || rt->year > 9999 ||
+	    rt->month < 1 || rt->month > 12 ||
+	    rt->hour > 23 || rt->minute > 59 || rt->second > 59 ||
+	    rt->tz < -1440 || (rt->tz > 1440 && rt->tz != 2047) ||
+	    rt->daylight > 3)
+		return -ERANGE;
+
+	args[0].buffer.pointer = (u8 *)rt;
+	args[0].buffer.length = sizeof(*rt);
+
+	pm_runtime_get_sync(dev);
+
+	status = acpi_evaluate_integer(handle, "_SRT", &arg_list, &retval);
+
+	pm_runtime_put_sync(dev);
+
+	if (ACPI_FAILURE(status) || retval)
+		return -EIO;
+
+	return 0;
+}
+
+static int acpi_tad_get_real_time(struct device *dev, struct acpi_tad_rt *rt)
+{
+	acpi_handle handle = ACPI_HANDLE(dev);
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER };
+	union acpi_object *out_obj;
+	struct acpi_tad_rt *data;
+	acpi_status status;
+	int ret = -EIO;
+
+	pm_runtime_get_sync(dev);
+
+	status = acpi_evaluate_object(handle, "_GRT", NULL, &output);
+
+	pm_runtime_put_sync(dev);
+
+	if (ACPI_FAILURE(status))
+		goto out_free;
+
+	out_obj = output.pointer;
+	if (out_obj->type != ACPI_TYPE_BUFFER)
+		goto out_free;
+
+	if (out_obj->buffer.length != sizeof(*rt))
+		goto out_free;
+
+	data = (struct acpi_tad_rt *)(out_obj->buffer.pointer);
+	if (!data->valid)
+		goto out_free;
+
+	memcpy(rt, data, sizeof(*rt));
+	ret = 0;
+
+out_free:
+	ACPI_FREE(output.pointer);
+	return ret;
+}
+
+static char *acpi_tad_rt_next_field(char *s, int *val)
+{
+	char *p;
+
+	p = strchr(s, ':');
+	if (!p)
+		return NULL;
+
+	*p = '\0';
+	if (kstrtoint(s, 10, val))
+		return NULL;
+
+	return p + 1;
+}
+
+static ssize_t time_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct acpi_tad_rt rt;
+	char *str, *s;
+	int val, ret = -ENODATA;
+
+	str = kmemdup_nul(buf, count, GFP_KERNEL);
+	if (!str)
+		return -ENOMEM;
+
+	s = acpi_tad_rt_next_field(str, &val);
+	if (!s)
+		goto out_free;
+
+	rt.year = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.month = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.day = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.hour = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.minute = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.second = val;
+
+	s = acpi_tad_rt_next_field(s, &val);
+	if (!s)
+		goto out_free;
+
+	rt.tz = val;
+
+	if (kstrtoint(s, 10, &val))
+		goto out_free;
+
+	rt.daylight = val;
+
+	rt.valid = 0;
+	rt.msec = 0;
+	memset(rt.padding, 0, 3);
+
+	ret = acpi_tad_set_real_time(dev, &rt);
+
+out_free:
+	kfree(str);
+	return ret ? ret : count;
+}
+
+static ssize_t time_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct acpi_tad_rt rt;
+	int ret;
+
+	ret = acpi_tad_get_real_time(dev, &rt);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%u:%u:%u:%u:%u:%u:%d:%u\n",
+		       rt.year, rt.month, rt.day, rt.hour, rt.minute, rt.second,
+		       rt.tz, rt.daylight);
+}
+
+static DEVICE_ATTR_RW(time);
+
+static struct attribute *acpi_tad_time_attrs[] = {
+	&dev_attr_time.attr,
+	NULL,
+};
+static const struct attribute_group acpi_tad_time_attr_group = {
+	.attrs	= acpi_tad_time_attrs,
+};
+
+static int acpi_tad_wake_set(struct device *dev, char *method, u32 timer_id,
+			     u32 value)
+{
+	acpi_handle handle = ACPI_HANDLE(dev);
+	union acpi_object args[] = {
+		{ .type = ACPI_TYPE_INTEGER, },
+		{ .type = ACPI_TYPE_INTEGER, },
+	};
+	struct acpi_object_list arg_list = {
+		.pointer = args,
+		.count = ARRAY_SIZE(args),
+	};
+	unsigned long long retval;
+	acpi_status status;
+
+	args[0].integer.value = timer_id;
+	args[1].integer.value = value;
+
+	pm_runtime_get_sync(dev);
+
+	status = acpi_evaluate_integer(handle, method, &arg_list, &retval);
+
+	pm_runtime_put_sync(dev);
+
+	if (ACPI_FAILURE(status) || retval)
+		return -EIO;
+
+	return 0;
+}
+
+static int acpi_tad_wake_write(struct device *dev, const char *buf, char *method,
+			       u32 timer_id, const char *specval)
+{
+	u32 value;
+
+	if (sysfs_streq(buf, specval)) {
+		value = ACPI_TAD_WAKE_DISABLED;
+	} else {
+		int ret = kstrtou32(buf, 0, &value);
+
+		if (ret)
+			return ret;
+
+		if (value == ACPI_TAD_WAKE_DISABLED)
+			return -EINVAL;
+	}
+
+	return acpi_tad_wake_set(dev, method, timer_id, value);
+}
+
+static ssize_t acpi_tad_wake_read(struct device *dev, char *buf, char *method,
+				  u32 timer_id, const char *specval)
+{
+	acpi_handle handle = ACPI_HANDLE(dev);
+	union acpi_object args[] = {
+		{ .type = ACPI_TYPE_INTEGER, },
+	};
+	struct acpi_object_list arg_list = {
+		.pointer = args,
+		.count = ARRAY_SIZE(args),
+	};
+	unsigned long long retval;
+	acpi_status status;
+
+	args[0].integer.value = timer_id;
+
+	pm_runtime_get_sync(dev);
+
+	status = acpi_evaluate_integer(handle, method, &arg_list, &retval);
+
+	pm_runtime_put_sync(dev);
+
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	if ((u32)retval == ACPI_TAD_WAKE_DISABLED)
+		return sprintf(buf, "%s\n", specval);
+
+	return sprintf(buf, "%u\n", (u32)retval);
+}
+
+static const char *alarm_specval = "disabled";
+
+static int acpi_tad_alarm_write(struct device *dev, const char *buf,
+				u32 timer_id)
+{
+	return acpi_tad_wake_write(dev, buf, "_STV", timer_id, alarm_specval);
+}
+
+static ssize_t acpi_tad_alarm_read(struct device *dev, char *buf, u32 timer_id)
+{
+	return acpi_tad_wake_read(dev, buf, "_TIV", timer_id, alarm_specval);
+}
+
+static const char *policy_specval = "never";
+
+static int acpi_tad_policy_write(struct device *dev, const char *buf,
+				 u32 timer_id)
+{
+	return acpi_tad_wake_write(dev, buf, "_STP", timer_id, policy_specval);
+}
+
+static ssize_t acpi_tad_policy_read(struct device *dev, char *buf, u32 timer_id)
+{
+	return acpi_tad_wake_read(dev, buf, "_TIP", timer_id, policy_specval);
+}
+
+static int acpi_tad_clear_status(struct device *dev, u32 timer_id)
+{
+	acpi_handle handle = ACPI_HANDLE(dev);
+	union acpi_object args[] = {
+		{ .type = ACPI_TYPE_INTEGER, },
+	};
+	struct acpi_object_list arg_list = {
+		.pointer = args,
+		.count = ARRAY_SIZE(args),
+	};
+	unsigned long long retval;
+	acpi_status status;
+
+	args[0].integer.value = timer_id;
+
+	pm_runtime_get_sync(dev);
+
+	status = acpi_evaluate_integer(handle, "_CWS", &arg_list, &retval);
+
+	pm_runtime_put_sync(dev);
+
+	if (ACPI_FAILURE(status) || retval)
+		return -EIO;
+
+	return 0;
+}
+
+static int acpi_tad_status_write(struct device *dev, const char *buf, u32 timer_id)
+{
+	int ret, value;
+
+	ret = kstrtoint(buf, 0, &value);
+	if (ret)
+		return ret;
+
+	if (value)
+		return -EINVAL;
+
+	return acpi_tad_clear_status(dev, timer_id);
+}
+
+static ssize_t acpi_tad_status_read(struct device *dev, char *buf, u32 timer_id)
+{
+	acpi_handle handle = ACPI_HANDLE(dev);
+	union acpi_object args[] = {
+		{ .type = ACPI_TYPE_INTEGER, },
+	};
+	struct acpi_object_list arg_list = {
+		.pointer = args,
+		.count = ARRAY_SIZE(args),
+	};
+	unsigned long long retval;
+	acpi_status status;
+
+	args[0].integer.value = timer_id;
+
+	pm_runtime_get_sync(dev);
+
+	status = acpi_evaluate_integer(handle, "_GWS", &arg_list, &retval);
+
+	pm_runtime_put_sync(dev);
+
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	return sprintf(buf, "0x%02X\n", (u32)retval);
+}
+
+static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct acpi_tad_driver_data *dd = dev_get_drvdata(dev);
+
+	return sprintf(buf, "0x%02X\n", dd->capabilities);
+}
+
+static DEVICE_ATTR_RO(caps);
+
+static ssize_t ac_alarm_store(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t count)
+{
+	int ret = acpi_tad_alarm_write(dev, buf, ACPI_TAD_AC_TIMER);
+
+	return ret ? ret : count;
+}
+
+static ssize_t ac_alarm_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	return acpi_tad_alarm_read(dev, buf, ACPI_TAD_AC_TIMER);
+}
+
+static DEVICE_ATTR_RW(ac_alarm);
+
+static ssize_t ac_policy_store(struct device *dev, struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	int ret = acpi_tad_policy_write(dev, buf, ACPI_TAD_AC_TIMER);
+
+	return ret ? ret : count;
+}
+
+static ssize_t ac_policy_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	return acpi_tad_policy_read(dev, buf, ACPI_TAD_AC_TIMER);
+}
+
+static DEVICE_ATTR_RW(ac_policy);
+
+static ssize_t ac_status_store(struct device *dev, struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	int ret = acpi_tad_status_write(dev, buf, ACPI_TAD_AC_TIMER);
+
+	return ret ? ret : count;
+}
+
+static ssize_t ac_status_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	return acpi_tad_status_read(dev, buf, ACPI_TAD_AC_TIMER);
+}
+
+static DEVICE_ATTR_RW(ac_status);
+
+static struct attribute *acpi_tad_attrs[] = {
+	&dev_attr_caps.attr,
+	&dev_attr_ac_alarm.attr,
+	&dev_attr_ac_policy.attr,
+	&dev_attr_ac_status.attr,
+	NULL,
+};
+static const struct attribute_group acpi_tad_attr_group = {
+	.attrs	= acpi_tad_attrs,
+};
+
+static ssize_t dc_alarm_store(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t count)
+{
+	int ret = acpi_tad_alarm_write(dev, buf, ACPI_TAD_DC_TIMER);
+
+	return ret ? ret : count;
+}
+
+static ssize_t dc_alarm_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	return acpi_tad_alarm_read(dev, buf, ACPI_TAD_DC_TIMER);
+}
+
+static DEVICE_ATTR_RW(dc_alarm);
+
+static ssize_t dc_policy_store(struct device *dev, struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	int ret = acpi_tad_policy_write(dev, buf, ACPI_TAD_DC_TIMER);
+
+	return ret ? ret : count;
+}
+
+static ssize_t dc_policy_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	return acpi_tad_policy_read(dev, buf, ACPI_TAD_DC_TIMER);
+}
+
+static DEVICE_ATTR_RW(dc_policy);
+
+static ssize_t dc_status_store(struct device *dev, struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	int ret = acpi_tad_status_write(dev, buf, ACPI_TAD_DC_TIMER);
+
+	return ret ? ret : count;
+}
+
+static ssize_t dc_status_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	return acpi_tad_status_read(dev, buf, ACPI_TAD_DC_TIMER);
+}
+
+static DEVICE_ATTR_RW(dc_status);
+
+static struct attribute *acpi_tad_dc_attrs[] = {
+	&dev_attr_dc_alarm.attr,
+	&dev_attr_dc_policy.attr,
+	&dev_attr_dc_status.attr,
+	NULL,
+};
+static const struct attribute_group acpi_tad_dc_attr_group = {
+	.attrs	= acpi_tad_dc_attrs,
+};
+
+static int acpi_tad_disable_timer(struct device *dev, u32 timer_id)
+{
+	return acpi_tad_wake_set(dev, "_STV", timer_id, ACPI_TAD_WAKE_DISABLED);
+}
+
+static int acpi_tad_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct acpi_tad_driver_data *dd = dev_get_drvdata(dev);
+
+	device_init_wakeup(dev, false);
+
+	pm_runtime_get_sync(dev);
+
+	if (dd->capabilities & ACPI_TAD_DC_WAKE)
+		sysfs_remove_group(&dev->kobj, &acpi_tad_dc_attr_group);
+
+	sysfs_remove_group(&dev->kobj, &acpi_tad_attr_group);
+
+	acpi_tad_disable_timer(dev, ACPI_TAD_AC_TIMER);
+	acpi_tad_clear_status(dev, ACPI_TAD_AC_TIMER);
+	if (dd->capabilities & ACPI_TAD_DC_WAKE) {
+		acpi_tad_disable_timer(dev, ACPI_TAD_DC_TIMER);
+		acpi_tad_clear_status(dev, ACPI_TAD_DC_TIMER);
+	}
+
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
+	return 0;
+}
+
+static int acpi_tad_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	acpi_handle handle = ACPI_HANDLE(dev);
+	struct acpi_tad_driver_data *dd;
+	acpi_status status;
+	unsigned long long caps;
+	int ret;
+
+	/*
+	 * Initialization failure messages are mostly about firmware issues, so
+	 * print them at the "info" level.
+	 */
+	status = acpi_evaluate_integer(handle, "_GCP", NULL, &caps);
+	if (ACPI_FAILURE(status)) {
+		dev_info(dev, "Unable to get capabilities\n");
+		return -ENODEV;
+	}
+
+	if (!(caps & ACPI_TAD_AC_WAKE)) {
+		dev_info(dev, "Unsupported capabilities\n");
+		return -ENODEV;
+	}
+
+	if (!acpi_has_method(handle, "_PRW")) {
+		dev_info(dev, "Missing _PRW\n");
+		return -ENODEV;
+	}
+
+	dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
+	if (!dd)
+		return -ENOMEM;
+
+	dd->capabilities = caps;
+	dev_set_drvdata(dev, dd);
+
+	/*
+	 * Assume that the ACPI PM domain has been attached to the device and
+	 * simply enable system wakeup and runtime PM and put the device into
+	 * runtime suspend.  Everything else should be taken care of by the ACPI
+	 * PM domain callbacks.
+	 */
+	device_init_wakeup(dev, true);
+	dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND |
+				     DPM_FLAG_MAY_SKIP_RESUME);
+	/*
+	 * The platform bus type layer tells the ACPI PM domain powers up the
+	 * device, so set the runtime PM status of it to "active".
+	 */
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_suspend(dev);
+
+	ret = sysfs_create_group(&dev->kobj, &acpi_tad_attr_group);
+	if (ret)
+		goto fail;
+
+	if (caps & ACPI_TAD_DC_WAKE) {
+		ret = sysfs_create_group(&dev->kobj, &acpi_tad_dc_attr_group);
+		if (ret)
+			goto fail;
+	}
+
+	if (caps & ACPI_TAD_RT) {
+		ret = sysfs_create_group(&dev->kobj, &acpi_tad_time_attr_group);
+		if (ret)
+			goto fail;
+	}
+
+	return 0;
+
+fail:
+	acpi_tad_remove(pdev);
+	return ret;
+}
+
+static const struct acpi_device_id acpi_tad_ids[] = {
+	{"ACPI000E", 0},
+	{}
+};
+
+static struct platform_driver acpi_tad_driver = {
+	.driver = {
+		.name = "acpi-tad",
+		.acpi_match_table = acpi_tad_ids,
+	},
+	.probe = acpi_tad_probe,
+	.remove = acpi_tad_remove,
+};
+MODULE_DEVICE_TABLE(acpi, acpi_tad_ids);
+
+module_platform_driver(acpi_tad_driver);