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, 979 insertions, 0 deletions

diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
new file mode 100644
index 000000000..8f0a3a35e
--- /dev/null
+++ b/drivers/iio/adc/ad799x.c
@@ -0,0 +1,979 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * iio/adc/ad799x.c
+ * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
+ *
+ * based on iio/adc/max1363
+ * Copyright (C) 2008-2010 Jonathan Cameron
+ *
+ * based on linux/drivers/i2c/chips/max123x
+ * Copyright (C) 2002-2004 Stefan Eletzhofer
+ *
+ * based on linux/drivers/acron/char/pcf8583.c
+ * Copyright (C) 2000 Russell King
+ *
+ * ad799x.c
+ *
+ * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
+ * ad7998 and similar chips.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/i2c.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/bitops.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define AD799X_CHANNEL_SHIFT			4
+
+/*
+ * AD7991, AD7995 and AD7999 defines
+ */
+
+#define AD7991_REF_SEL				0x08
+#define AD7991_FLTR				0x04
+#define AD7991_BIT_TRIAL_DELAY			0x02
+#define AD7991_SAMPLE_DELAY			0x01
+
+/*
+ * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
+ */
+
+#define AD7998_FLTR				BIT(3)
+#define AD7998_ALERT_EN				BIT(2)
+#define AD7998_BUSY_ALERT			BIT(1)
+#define AD7998_BUSY_ALERT_POL			BIT(0)
+
+#define AD7998_CONV_RES_REG			0x0
+#define AD7998_ALERT_STAT_REG			0x1
+#define AD7998_CONF_REG				0x2
+#define AD7998_CYCLE_TMR_REG			0x3
+
+#define AD7998_DATALOW_REG(x)			((x) * 3 + 0x4)
+#define AD7998_DATAHIGH_REG(x)			((x) * 3 + 0x5)
+#define AD7998_HYST_REG(x)			((x) * 3 + 0x6)
+
+#define AD7998_CYC_MASK				GENMASK(2, 0)
+#define AD7998_CYC_DIS				0x0
+#define AD7998_CYC_TCONF_32			0x1
+#define AD7998_CYC_TCONF_64			0x2
+#define AD7998_CYC_TCONF_128			0x3
+#define AD7998_CYC_TCONF_256			0x4
+#define AD7998_CYC_TCONF_512			0x5
+#define AD7998_CYC_TCONF_1024			0x6
+#define AD7998_CYC_TCONF_2048			0x7
+
+#define AD7998_ALERT_STAT_CLEAR			0xFF
+
+/*
+ * AD7997 and AD7997 defines
+ */
+
+#define AD7997_8_READ_SINGLE			BIT(7)
+#define AD7997_8_READ_SEQUENCE			(BIT(6) | BIT(5) | BIT(4))
+
+enum {
+	ad7991,
+	ad7995,
+	ad7999,
+	ad7992,
+	ad7993,
+	ad7994,
+	ad7997,
+	ad7998
+};
+
+/**
+ * struct ad799x_chip_config - chip specific information
+ * @channel:		channel specification
+ * @default_config:	device default configuration
+ * @info:		pointer to iio_info struct
+ */
+struct ad799x_chip_config {
+	const struct iio_chan_spec	channel[9];
+	u16				default_config;
+	const struct iio_info		*info;
+};
+
+/**
+ * struct ad799x_chip_info - chip specific information
+ * @num_channels:	number of channels
+ * @noirq_config:	device configuration w/o IRQ
+ * @irq_config:		device configuration w/IRQ
+ */
+struct ad799x_chip_info {
+	int				num_channels;
+	const struct ad799x_chip_config	noirq_config;
+	const struct ad799x_chip_config	irq_config;
+};
+
+struct ad799x_state {
+	struct i2c_client		*client;
+	const struct ad799x_chip_config	*chip_config;
+	struct regulator		*reg;
+	struct regulator		*vref;
+	/* lock to protect against multiple access to the device */
+	struct mutex			lock;
+	unsigned			id;
+	u16				config;
+
+	u8				*rx_buf;
+	unsigned int			transfer_size;
+};
+
+static int ad799x_write_config(struct ad799x_state *st, u16 val)
+{
+	switch (st->id) {
+	case ad7997:
+	case ad7998:
+		return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
+			val);
+	case ad7992:
+	case ad7993:
+	case ad7994:
+		return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
+			val);
+	default:
+		/* Will be written when doing a conversion */
+		st->config = val;
+		return 0;
+	}
+}
+
+static int ad799x_read_config(struct ad799x_state *st)
+{
+	switch (st->id) {
+	case ad7997:
+	case ad7998:
+		return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
+	case ad7992:
+	case ad7993:
+	case ad7994:
+		return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
+	default:
+		/* No readback support */
+		return st->config;
+	}
+}
+
+static int ad799x_update_config(struct ad799x_state *st, u16 config)
+{
+	int ret;
+
+	ret = ad799x_write_config(st, config);
+	if (ret < 0)
+		return ret;
+	ret = ad799x_read_config(st);
+	if (ret < 0)
+		return ret;
+	st->config = ret;
+
+	return 0;
+}
+
+static irqreturn_t ad799x_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ad799x_state *st = iio_priv(indio_dev);
+	int b_sent;
+	u8 cmd;
+
+	switch (st->id) {
+	case ad7991:
+	case ad7995:
+	case ad7999:
+		cmd = st->config |
+			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
+		break;
+	case ad7992:
+	case ad7993:
+	case ad7994:
+		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
+			AD7998_CONV_RES_REG;
+		break;
+	case ad7997:
+	case ad7998:
+		cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
+		break;
+	default:
+		cmd = 0;
+	}
+
+	b_sent = i2c_smbus_read_i2c_block_data(st->client,
+			cmd, st->transfer_size, st->rx_buf);
+	if (b_sent < 0)
+		goto out;
+
+	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
+			iio_get_time_ns(indio_dev));
+out:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
+	const unsigned long *scan_mask)
+{
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	kfree(st->rx_buf);
+	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+	if (!st->rx_buf)
+		return -ENOMEM;
+
+	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
+
+	switch (st->id) {
+	case ad7992:
+	case ad7993:
+	case ad7994:
+	case ad7997:
+	case ad7998:
+		st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
+		st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
+		return ad799x_write_config(st, st->config);
+	default:
+		return 0;
+	}
+}
+
+static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
+{
+	u8 cmd;
+
+	switch (st->id) {
+	case ad7991:
+	case ad7995:
+	case ad7999:
+		cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
+		break;
+	case ad7992:
+	case ad7993:
+	case ad7994:
+		cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
+		break;
+	case ad7997:
+	case ad7998:
+		cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return i2c_smbus_read_word_swapped(st->client, cmd);
+}
+
+static int ad799x_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val,
+			   int *val2,
+			   long m)
+{
+	int ret;
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+		mutex_lock(&st->lock);
+		ret = ad799x_scan_direct(st, chan->scan_index);
+		mutex_unlock(&st->lock);
+		iio_device_release_direct_mode(indio_dev);
+
+		if (ret < 0)
+			return ret;
+		*val = (ret >> chan->scan_type.shift) &
+			GENMASK(chan->scan_type.realbits - 1, 0);
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		if (st->vref)
+			ret = regulator_get_voltage(st->vref);
+		else
+			ret = regulator_get_voltage(st->reg);
+
+		if (ret < 0)
+			return ret;
+		*val = ret / 1000;
+		*val2 = chan->scan_type.realbits;
+		return IIO_VAL_FRACTIONAL_LOG2;
+	}
+	return -EINVAL;
+}
+static const unsigned int ad7998_frequencies[] = {
+	[AD7998_CYC_DIS]	= 0,
+	[AD7998_CYC_TCONF_32]	= 15625,
+	[AD7998_CYC_TCONF_64]	= 7812,
+	[AD7998_CYC_TCONF_128]	= 3906,
+	[AD7998_CYC_TCONF_512]	= 976,
+	[AD7998_CYC_TCONF_1024]	= 488,
+	[AD7998_CYC_TCONF_2048]	= 244,
+};
+
+static ssize_t ad799x_read_frequency(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
+}
+
+static ssize_t ad799x_write_frequency(struct device *dev,
+					 struct device_attribute *attr,
+					 const char *buf,
+					 size_t len)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	long val;
+	int ret, i;
+
+	ret = kstrtol(buf, 10, &val);
+	if (ret)
+		return ret;
+
+	mutex_lock(&st->lock);
+
+	ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
+	if (ret < 0)
+		goto error_ret_mutex;
+	/* Wipe the bits clean */
+	ret &= ~AD7998_CYC_MASK;
+
+	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
+		if (val == ad7998_frequencies[i])
+			break;
+	if (i == ARRAY_SIZE(ad7998_frequencies)) {
+		ret = -EINVAL;
+		goto error_ret_mutex;
+	}
+
+	ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
+		ret | i);
+	if (ret < 0)
+		goto error_ret_mutex;
+	ret = len;
+
+error_ret_mutex:
+	mutex_unlock(&st->lock);
+
+	return ret;
+}
+
+static int ad799x_read_event_config(struct iio_dev *indio_dev,
+				    const struct iio_chan_spec *chan,
+				    enum iio_event_type type,
+				    enum iio_event_direction dir)
+{
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	if (!(st->config & AD7998_ALERT_EN))
+		return 0;
+
+	if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
+		return 1;
+
+	return 0;
+}
+
+static int ad799x_write_event_config(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir,
+				     int state)
+{
+	struct ad799x_state *st = iio_priv(indio_dev);
+	int ret;
+
+	ret = iio_device_claim_direct_mode(indio_dev);
+	if (ret)
+		return ret;
+
+	mutex_lock(&st->lock);
+
+	if (state)
+		st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
+	else
+		st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
+
+	if (st->config >> AD799X_CHANNEL_SHIFT)
+		st->config |= AD7998_ALERT_EN;
+	else
+		st->config &= ~AD7998_ALERT_EN;
+
+	ret = ad799x_write_config(st, st->config);
+	mutex_unlock(&st->lock);
+	iio_device_release_direct_mode(indio_dev);
+	return ret;
+}
+
+static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
+					 enum iio_event_direction dir,
+					 enum iio_event_info info)
+{
+	switch (info) {
+	case IIO_EV_INFO_VALUE:
+		if (dir == IIO_EV_DIR_FALLING)
+			return AD7998_DATALOW_REG(chan->channel);
+		else
+			return AD7998_DATAHIGH_REG(chan->channel);
+	case IIO_EV_INFO_HYSTERESIS:
+		return AD7998_HYST_REG(chan->channel);
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ad799x_write_event_value(struct iio_dev *indio_dev,
+				    const struct iio_chan_spec *chan,
+				    enum iio_event_type type,
+				    enum iio_event_direction dir,
+				    enum iio_event_info info,
+				    int val, int val2)
+{
+	int ret;
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
+		return -EINVAL;
+
+	ret = i2c_smbus_write_word_swapped(st->client,
+		ad799x_threshold_reg(chan, dir, info),
+		val << chan->scan_type.shift);
+
+	return ret;
+}
+
+static int ad799x_read_event_value(struct iio_dev *indio_dev,
+				    const struct iio_chan_spec *chan,
+				    enum iio_event_type type,
+				    enum iio_event_direction dir,
+				    enum iio_event_info info,
+				    int *val, int *val2)
+{
+	int ret;
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	ret = i2c_smbus_read_word_swapped(st->client,
+		ad799x_threshold_reg(chan, dir, info));
+	if (ret < 0)
+		return ret;
+	*val = (ret >> chan->scan_type.shift) &
+		GENMASK(chan->scan_type.realbits - 1, 0);
+
+	return IIO_VAL_INT;
+}
+
+static irqreturn_t ad799x_event_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct ad799x_state *st = iio_priv(private);
+	int i, ret;
+
+	ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
+	if (ret <= 0)
+		goto done;
+
+	if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
+		AD7998_ALERT_STAT_CLEAR) < 0)
+		goto done;
+
+	for (i = 0; i < 8; i++) {
+		if (ret & BIT(i))
+			iio_push_event(indio_dev,
+				       i & 0x1 ?
+				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+							    (i >> 1),
+							    IIO_EV_TYPE_THRESH,
+							    IIO_EV_DIR_RISING) :
+				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
+							    (i >> 1),
+							    IIO_EV_TYPE_THRESH,
+							    IIO_EV_DIR_FALLING),
+				       iio_get_time_ns(indio_dev));
+	}
+
+done:
+	return IRQ_HANDLED;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
+			      ad799x_read_frequency,
+			      ad799x_write_frequency);
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
+
+static struct attribute *ad799x_event_attributes[] = {
+	&iio_dev_attr_sampling_frequency.dev_attr.attr,
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ad799x_event_attrs_group = {
+	.attrs = ad799x_event_attributes,
+};
+
+static const struct iio_info ad7991_info = {
+	.read_raw = &ad799x_read_raw,
+	.update_scan_mode = ad799x_update_scan_mode,
+};
+
+static const struct iio_info ad7993_4_7_8_noirq_info = {
+	.read_raw = &ad799x_read_raw,
+	.update_scan_mode = ad799x_update_scan_mode,
+};
+
+static const struct iio_info ad7993_4_7_8_irq_info = {
+	.read_raw = &ad799x_read_raw,
+	.event_attrs = &ad799x_event_attrs_group,
+	.read_event_config = &ad799x_read_event_config,
+	.write_event_config = &ad799x_write_event_config,
+	.read_event_value = &ad799x_read_event_value,
+	.write_event_value = &ad799x_write_event_value,
+	.update_scan_mode = ad799x_update_scan_mode,
+};
+
+static const struct iio_event_spec ad799x_events[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+			BIT(IIO_EV_INFO_ENABLE),
+	}, {
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+			BIT(IIO_EV_INFO_ENABLE),
+	}, {
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_EITHER,
+		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
+	},
+};
+
+#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
+	.type = IIO_VOLTAGE, \
+	.indexed = 1, \
+	.channel = (_index), \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+	.scan_index = (_index), \
+	.scan_type = { \
+		.sign = 'u', \
+		.realbits = (_realbits), \
+		.storagebits = 16, \
+		.shift = 12 - (_realbits), \
+		.endianness = IIO_BE, \
+	}, \
+	.event_spec = _ev_spec, \
+	.num_event_specs = _num_ev_spec, \
+}
+
+#define AD799X_CHANNEL(_index, _realbits) \
+	_AD799X_CHANNEL(_index, _realbits, NULL, 0)
+
+#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
+	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
+		ARRAY_SIZE(ad799x_events))
+
+static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
+	[ad7991] = {
+		.num_channels = 5,
+		.noirq_config = {
+			.channel = {
+				AD799X_CHANNEL(0, 12),
+				AD799X_CHANNEL(1, 12),
+				AD799X_CHANNEL(2, 12),
+				AD799X_CHANNEL(3, 12),
+				IIO_CHAN_SOFT_TIMESTAMP(4),
+			},
+			.info = &ad7991_info,
+		},
+	},
+	[ad7995] = {
+		.num_channels = 5,
+		.noirq_config = {
+			.channel = {
+				AD799X_CHANNEL(0, 10),
+				AD799X_CHANNEL(1, 10),
+				AD799X_CHANNEL(2, 10),
+				AD799X_CHANNEL(3, 10),
+				IIO_CHAN_SOFT_TIMESTAMP(4),
+			},
+			.info = &ad7991_info,
+		},
+	},
+	[ad7999] = {
+		.num_channels = 5,
+		.noirq_config = {
+			.channel = {
+				AD799X_CHANNEL(0, 8),
+				AD799X_CHANNEL(1, 8),
+				AD799X_CHANNEL(2, 8),
+				AD799X_CHANNEL(3, 8),
+				IIO_CHAN_SOFT_TIMESTAMP(4),
+			},
+			.info = &ad7991_info,
+		},
+	},
+	[ad7992] = {
+		.num_channels = 3,
+		.noirq_config = {
+			.channel = {
+				AD799X_CHANNEL(0, 12),
+				AD799X_CHANNEL(1, 12),
+				IIO_CHAN_SOFT_TIMESTAMP(3),
+			},
+			.info = &ad7993_4_7_8_noirq_info,
+		},
+		.irq_config = {
+			.channel = {
+				AD799X_CHANNEL_WITH_EVENTS(0, 12),
+				AD799X_CHANNEL_WITH_EVENTS(1, 12),
+				IIO_CHAN_SOFT_TIMESTAMP(3),
+			},
+			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
+			.info = &ad7993_4_7_8_irq_info,
+		},
+	},
+	[ad7993] = {
+		.num_channels = 5,
+		.noirq_config = {
+			.channel = {
+				AD799X_CHANNEL(0, 10),
+				AD799X_CHANNEL(1, 10),
+				AD799X_CHANNEL(2, 10),
+				AD799X_CHANNEL(3, 10),
+				IIO_CHAN_SOFT_TIMESTAMP(4),
+			},
+			.info = &ad7993_4_7_8_noirq_info,
+		},
+		.irq_config = {
+			.channel = {
+				AD799X_CHANNEL_WITH_EVENTS(0, 10),
+				AD799X_CHANNEL_WITH_EVENTS(1, 10),
+				AD799X_CHANNEL_WITH_EVENTS(2, 10),
+				AD799X_CHANNEL_WITH_EVENTS(3, 10),
+				IIO_CHAN_SOFT_TIMESTAMP(4),
+			},
+			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
+			.info = &ad7993_4_7_8_irq_info,
+		},
+	},
+	[ad7994] = {
+		.num_channels = 5,
+		.noirq_config = {
+			.channel = {
+				AD799X_CHANNEL(0, 12),
+				AD799X_CHANNEL(1, 12),
+				AD799X_CHANNEL(2, 12),
+				AD799X_CHANNEL(3, 12),
+				IIO_CHAN_SOFT_TIMESTAMP(4),
+			},
+			.info = &ad7993_4_7_8_noirq_info,
+		},
+		.irq_config = {
+			.channel = {
+				AD799X_CHANNEL_WITH_EVENTS(0, 12),
+				AD799X_CHANNEL_WITH_EVENTS(1, 12),
+				AD799X_CHANNEL_WITH_EVENTS(2, 12),
+				AD799X_CHANNEL_WITH_EVENTS(3, 12),
+				IIO_CHAN_SOFT_TIMESTAMP(4),
+			},
+			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
+			.info = &ad7993_4_7_8_irq_info,
+		},
+	},
+	[ad7997] = {
+		.num_channels = 9,
+		.noirq_config = {
+			.channel = {
+				AD799X_CHANNEL(0, 10),
+				AD799X_CHANNEL(1, 10),
+				AD799X_CHANNEL(2, 10),
+				AD799X_CHANNEL(3, 10),
+				AD799X_CHANNEL(4, 10),
+				AD799X_CHANNEL(5, 10),
+				AD799X_CHANNEL(6, 10),
+				AD799X_CHANNEL(7, 10),
+				IIO_CHAN_SOFT_TIMESTAMP(8),
+			},
+			.info = &ad7993_4_7_8_noirq_info,
+		},
+		.irq_config = {
+			.channel = {
+				AD799X_CHANNEL_WITH_EVENTS(0, 10),
+				AD799X_CHANNEL_WITH_EVENTS(1, 10),
+				AD799X_CHANNEL_WITH_EVENTS(2, 10),
+				AD799X_CHANNEL_WITH_EVENTS(3, 10),
+				AD799X_CHANNEL(4, 10),
+				AD799X_CHANNEL(5, 10),
+				AD799X_CHANNEL(6, 10),
+				AD799X_CHANNEL(7, 10),
+				IIO_CHAN_SOFT_TIMESTAMP(8),
+			},
+			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
+			.info = &ad7993_4_7_8_irq_info,
+		},
+	},
+	[ad7998] = {
+		.num_channels = 9,
+		.noirq_config = {
+			.channel = {
+				AD799X_CHANNEL(0, 12),
+				AD799X_CHANNEL(1, 12),
+				AD799X_CHANNEL(2, 12),
+				AD799X_CHANNEL(3, 12),
+				AD799X_CHANNEL(4, 12),
+				AD799X_CHANNEL(5, 12),
+				AD799X_CHANNEL(6, 12),
+				AD799X_CHANNEL(7, 12),
+				IIO_CHAN_SOFT_TIMESTAMP(8),
+			},
+			.info = &ad7993_4_7_8_noirq_info,
+		},
+		.irq_config = {
+			.channel = {
+				AD799X_CHANNEL_WITH_EVENTS(0, 12),
+				AD799X_CHANNEL_WITH_EVENTS(1, 12),
+				AD799X_CHANNEL_WITH_EVENTS(2, 12),
+				AD799X_CHANNEL_WITH_EVENTS(3, 12),
+				AD799X_CHANNEL(4, 12),
+				AD799X_CHANNEL(5, 12),
+				AD799X_CHANNEL(6, 12),
+				AD799X_CHANNEL(7, 12),
+				IIO_CHAN_SOFT_TIMESTAMP(8),
+			},
+			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
+			.info = &ad7993_4_7_8_irq_info,
+		},
+	},
+};
+
+static int ad799x_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *id = i2c_client_get_device_id(client);
+	int ret;
+	int extra_config = 0;
+	struct ad799x_state *st;
+	struct iio_dev *indio_dev;
+	const struct ad799x_chip_info *chip_info =
+		&ad799x_chip_info_tbl[id->driver_data];
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
+	if (indio_dev == NULL)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+	/* this is only used for device removal purposes */
+	i2c_set_clientdata(client, indio_dev);
+
+	st->id = id->driver_data;
+	if (client->irq > 0 && chip_info->irq_config.info)
+		st->chip_config = &chip_info->irq_config;
+	else
+		st->chip_config = &chip_info->noirq_config;
+
+	/* TODO: Add pdata options for filtering and bit delay */
+
+	st->reg = devm_regulator_get(&client->dev, "vcc");
+	if (IS_ERR(st->reg))
+		return PTR_ERR(st->reg);
+	ret = regulator_enable(st->reg);
+	if (ret)
+		return ret;
+
+	/* check if an external reference is supplied */
+	st->vref = devm_regulator_get_optional(&client->dev, "vref");
+
+	if (IS_ERR(st->vref)) {
+		if (PTR_ERR(st->vref) == -ENODEV) {
+			st->vref = NULL;
+			dev_info(&client->dev, "Using VCC reference voltage\n");
+		} else {
+			ret = PTR_ERR(st->vref);
+			goto error_disable_reg;
+		}
+	}
+
+	if (st->vref) {
+		/*
+		 * Use external reference voltage if supported by hardware.
+		 * This is optional if voltage / regulator present, use VCC otherwise.
+		 */
+		if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) {
+			dev_info(&client->dev, "Using external reference voltage\n");
+			extra_config |= AD7991_REF_SEL;
+			ret = regulator_enable(st->vref);
+			if (ret)
+				goto error_disable_reg;
+		} else {
+			st->vref = NULL;
+			dev_warn(&client->dev, "Supplied reference not supported\n");
+		}
+	}
+
+	st->client = client;
+
+	indio_dev->name = id->name;
+	indio_dev->info = st->chip_config->info;
+
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = st->chip_config->channel;
+	indio_dev->num_channels = chip_info->num_channels;
+
+	ret = ad799x_update_config(st, st->chip_config->default_config | extra_config);
+	if (ret)
+		goto error_disable_vref;
+
+	ret = iio_triggered_buffer_setup(indio_dev, NULL,
+		&ad799x_trigger_handler, NULL);
+	if (ret)
+		goto error_disable_vref;
+
+	if (client->irq > 0) {
+		ret = devm_request_threaded_irq(&client->dev,
+						client->irq,
+						NULL,
+						ad799x_event_handler,
+						IRQF_TRIGGER_FALLING |
+						IRQF_ONESHOT,
+						client->name,
+						indio_dev);
+		if (ret)
+			goto error_cleanup_ring;
+	}
+
+	mutex_init(&st->lock);
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto error_cleanup_ring;
+
+	return 0;
+
+error_cleanup_ring:
+	iio_triggered_buffer_cleanup(indio_dev);
+error_disable_vref:
+	if (st->vref)
+		regulator_disable(st->vref);
+error_disable_reg:
+	regulator_disable(st->reg);
+
+	return ret;
+}
+
+static void ad799x_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	iio_triggered_buffer_cleanup(indio_dev);
+	if (st->vref)
+		regulator_disable(st->vref);
+	regulator_disable(st->reg);
+	kfree(st->rx_buf);
+}
+
+static int ad799x_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	if (st->vref)
+		regulator_disable(st->vref);
+	regulator_disable(st->reg);
+
+	return 0;
+}
+
+static int ad799x_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct ad799x_state *st = iio_priv(indio_dev);
+	int ret;
+
+	ret = regulator_enable(st->reg);
+	if (ret) {
+		dev_err(dev, "Unable to enable vcc regulator\n");
+		return ret;
+	}
+
+	if (st->vref) {
+		ret = regulator_enable(st->vref);
+		if (ret) {
+			regulator_disable(st->reg);
+			dev_err(dev, "Unable to enable vref regulator\n");
+			return ret;
+		}
+	}
+
+	/* resync config */
+	ret = ad799x_update_config(st, st->config);
+	if (ret) {
+		if (st->vref)
+			regulator_disable(st->vref);
+		regulator_disable(st->reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
+
+static const struct i2c_device_id ad799x_id[] = {
+	{ "ad7991", ad7991 },
+	{ "ad7995", ad7995 },
+	{ "ad7999", ad7999 },
+	{ "ad7992", ad7992 },
+	{ "ad7993", ad7993 },
+	{ "ad7994", ad7994 },
+	{ "ad7997", ad7997 },
+	{ "ad7998", ad7998 },
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad799x_id);
+
+static struct i2c_driver ad799x_driver = {
+	.driver = {
+		.name = "ad799x",
+		.pm = pm_sleep_ptr(&ad799x_pm_ops),
+	},
+	.probe_new = ad799x_probe,
+	.remove = ad799x_remove,
+	.id_table = ad799x_id,
+};
+module_i2c_driver(ad799x_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD799x ADC");
+MODULE_LICENSE("GPL v2");