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().
  ...

8 files changed, 1209 insertions, 0 deletions

diff --git a/drivers/iio/common/st_sensors/Kconfig b/drivers/iio/common/st_sensors/Kconfig
new file mode 100644
index 000000000..eda8f347f
--- /dev/null
+++ b/drivers/iio/common/st_sensors/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# STMicroelectronics sensors common library
+#
+
+config IIO_ST_SENSORS_I2C
+	tristate
+	select REGMAP_I2C
+
+config IIO_ST_SENSORS_SPI
+	tristate
+	select REGMAP_SPI
+
+config IIO_ST_SENSORS_CORE
+	tristate
diff --git a/drivers/iio/common/st_sensors/Makefile b/drivers/iio/common/st_sensors/Makefile
new file mode 100644
index 000000000..f7fb3b79b
--- /dev/null
+++ b/drivers/iio/common/st_sensors/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the STMicroelectronics sensor common modules.
+#
+
+obj-$(CONFIG_IIO_ST_SENSORS_I2C) += st_sensors_i2c.o
+obj-$(CONFIG_IIO_ST_SENSORS_SPI) += st_sensors_spi.o
+obj-$(CONFIG_IIO_ST_SENSORS_CORE) += st_sensors.o
+st_sensors-y := st_sensors_core.o
+st_sensors-$(CONFIG_IIO_BUFFER) += st_sensors_buffer.o
+st_sensors-$(CONFIG_IIO_TRIGGER) += st_sensors_trigger.o
diff --git a/drivers/iio/common/st_sensors/st_sensors_buffer.c b/drivers/iio/common/st_sensors/st_sensors_buffer.c
new file mode 100644
index 000000000..e2f108ca9
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_buffer.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors buffer library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/interrupt.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/irqreturn.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+
+static int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	unsigned int num_data_channels = sdata->num_data_channels;
+	int i;
+
+	for_each_set_bit(i, indio_dev->active_scan_mask, num_data_channels) {
+		const struct iio_chan_spec *channel = &indio_dev->channels[i];
+		unsigned int bytes_to_read =
+			DIV_ROUND_UP(channel->scan_type.realbits +
+				     channel->scan_type.shift, 8);
+		unsigned int storage_bytes =
+			channel->scan_type.storagebits >> 3;
+
+		buf = PTR_ALIGN(buf, storage_bytes);
+		if (regmap_bulk_read(sdata->regmap, channel->address,
+				     buf, bytes_to_read) < 0)
+			return -EIO;
+
+		/* Advance the buffer pointer */
+		buf += storage_bytes;
+	}
+
+	return 0;
+}
+
+irqreturn_t st_sensors_trigger_handler(int irq, void *p)
+{
+	int len;
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	s64 timestamp;
+
+	/*
+	 * If we do timestamping here, do it before reading the values, because
+	 * once we've read the values, new interrupts can occur (when using
+	 * the hardware trigger) and the hw_timestamp may get updated.
+	 * By storing it in a local variable first, we are safe.
+	 */
+	if (iio_trigger_using_own(indio_dev))
+		timestamp = sdata->hw_timestamp;
+	else
+		timestamp = iio_get_time_ns(indio_dev);
+
+	len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data);
+	if (len < 0)
+		goto st_sensors_get_buffer_element_error;
+
+	iio_push_to_buffers_with_timestamp(indio_dev, sdata->buffer_data,
+					   timestamp);
+
+st_sensors_get_buffer_element_error:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL_NS(st_sensors_trigger_handler, IIO_ST_SENSORS);
diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
new file mode 100644
index 000000000..c77d7bdcc
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -0,0 +1,664 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors core library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
+#include <asm/unaligned.h>
+#include <linux/iio/common/st_sensors.h>
+
+#include "st_sensors_core.h"
+
+int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
+				    u8 reg_addr, u8 mask, u8 data)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	return regmap_update_bits(sdata->regmap,
+				  reg_addr, mask, data << __ffs(mask));
+}
+
+int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
+				  unsigned reg, unsigned writeval,
+				  unsigned *readval)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	int err;
+
+	if (!readval)
+		return regmap_write(sdata->regmap, reg, writeval);
+
+	err = regmap_read(sdata->regmap, reg, readval);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_debugfs_reg_access, IIO_ST_SENSORS);
+
+static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
+			unsigned int odr, struct st_sensor_odr_avl *odr_out)
+{
+	int i, ret = -EINVAL;
+
+	for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
+		if (sensor_settings->odr.odr_avl[i].hz == 0)
+			goto st_sensors_match_odr_error;
+
+		if (sensor_settings->odr.odr_avl[i].hz == odr) {
+			odr_out->hz = sensor_settings->odr.odr_avl[i].hz;
+			odr_out->value = sensor_settings->odr.odr_avl[i].value;
+			ret = 0;
+			break;
+		}
+	}
+
+st_sensors_match_odr_error:
+	return ret;
+}
+
+int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
+{
+	int err = 0;
+	struct st_sensor_odr_avl odr_out = {0, 0};
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	mutex_lock(&sdata->odr_lock);
+
+	if (!sdata->sensor_settings->odr.mask)
+		goto unlock_mutex;
+
+	err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
+	if (err < 0)
+		goto unlock_mutex;
+
+	if ((sdata->sensor_settings->odr.addr ==
+					sdata->sensor_settings->pw.addr) &&
+				(sdata->sensor_settings->odr.mask ==
+					sdata->sensor_settings->pw.mask)) {
+		if (sdata->enabled == true) {
+			err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->odr.addr,
+				sdata->sensor_settings->odr.mask,
+				odr_out.value);
+		} else {
+			err = 0;
+		}
+	} else {
+		err = st_sensors_write_data_with_mask(indio_dev,
+			sdata->sensor_settings->odr.addr,
+			sdata->sensor_settings->odr.mask,
+			odr_out.value);
+	}
+	if (err >= 0)
+		sdata->odr = odr_out.hz;
+
+unlock_mutex:
+	mutex_unlock(&sdata->odr_lock);
+
+	return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_odr, IIO_ST_SENSORS);
+
+static int st_sensors_match_fs(struct st_sensor_settings *sensor_settings,
+					unsigned int fs, int *index_fs_avl)
+{
+	int i, ret = -EINVAL;
+
+	for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+		if (sensor_settings->fs.fs_avl[i].num == 0)
+			return ret;
+
+		if (sensor_settings->fs.fs_avl[i].num == fs) {
+			*index_fs_avl = i;
+			ret = 0;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
+{
+	int err, i = 0;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	if (sdata->sensor_settings->fs.addr == 0)
+		return 0;
+
+	err = st_sensors_match_fs(sdata->sensor_settings, fs, &i);
+	if (err < 0)
+		goto st_accel_set_fullscale_error;
+
+	err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->fs.addr,
+				sdata->sensor_settings->fs.mask,
+				sdata->sensor_settings->fs.fs_avl[i].value);
+	if (err < 0)
+		goto st_accel_set_fullscale_error;
+
+	sdata->current_fullscale = &sdata->sensor_settings->fs.fs_avl[i];
+	return err;
+
+st_accel_set_fullscale_error:
+	dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
+	return err;
+}
+
+int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
+{
+	u8 tmp_value;
+	int err = -EINVAL;
+	bool found = false;
+	struct st_sensor_odr_avl odr_out = {0, 0};
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	if (enable) {
+		tmp_value = sdata->sensor_settings->pw.value_on;
+		if ((sdata->sensor_settings->odr.addr ==
+					sdata->sensor_settings->pw.addr) &&
+				(sdata->sensor_settings->odr.mask ==
+					sdata->sensor_settings->pw.mask)) {
+			err = st_sensors_match_odr(sdata->sensor_settings,
+							sdata->odr, &odr_out);
+			if (err < 0)
+				goto set_enable_error;
+			tmp_value = odr_out.value;
+			found = true;
+		}
+		err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->pw.addr,
+				sdata->sensor_settings->pw.mask, tmp_value);
+		if (err < 0)
+			goto set_enable_error;
+
+		sdata->enabled = true;
+
+		if (found)
+			sdata->odr = odr_out.hz;
+	} else {
+		err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->pw.addr,
+				sdata->sensor_settings->pw.mask,
+				sdata->sensor_settings->pw.value_off);
+		if (err < 0)
+			goto set_enable_error;
+
+		sdata->enabled = false;
+	}
+
+set_enable_error:
+	return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_enable, IIO_ST_SENSORS);
+
+int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	int err = 0;
+
+	if (sdata->sensor_settings->enable_axis.addr)
+		err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->enable_axis.addr,
+				sdata->sensor_settings->enable_axis.mask,
+				axis_enable);
+	return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_axis_enable, IIO_ST_SENSORS);
+
+
+int st_sensors_power_enable(struct iio_dev *indio_dev)
+{
+	static const char * const regulator_names[] = { "vdd", "vddio" };
+	struct device *parent = indio_dev->dev.parent;
+	int err;
+
+	/* Regulators not mandatory, but if requested we should enable them. */
+	err = devm_regulator_bulk_get_enable(parent,
+					     ARRAY_SIZE(regulator_names),
+					     regulator_names);
+	if (err)
+		return dev_err_probe(&indio_dev->dev, err,
+				     "unable to enable supplies\n");
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_power_enable, IIO_ST_SENSORS);
+
+static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
+					struct st_sensors_platform_data *pdata)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	/* Sensor does not support interrupts */
+	if (!sdata->sensor_settings->drdy_irq.int1.addr &&
+	    !sdata->sensor_settings->drdy_irq.int2.addr) {
+		if (pdata->drdy_int_pin)
+			dev_info(&indio_dev->dev,
+				 "DRDY on pin INT%d specified, but sensor does not support interrupts\n",
+				 pdata->drdy_int_pin);
+		return 0;
+	}
+
+	switch (pdata->drdy_int_pin) {
+	case 1:
+		if (!sdata->sensor_settings->drdy_irq.int1.mask) {
+			dev_err(&indio_dev->dev,
+					"DRDY on INT1 not available.\n");
+			return -EINVAL;
+		}
+		sdata->drdy_int_pin = 1;
+		break;
+	case 2:
+		if (!sdata->sensor_settings->drdy_irq.int2.mask) {
+			dev_err(&indio_dev->dev,
+					"DRDY on INT2 not available.\n");
+			return -EINVAL;
+		}
+		sdata->drdy_int_pin = 2;
+		break;
+	default:
+		dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
+		return -EINVAL;
+	}
+
+	if (pdata->open_drain) {
+		if (!sdata->sensor_settings->drdy_irq.int1.addr_od &&
+		    !sdata->sensor_settings->drdy_irq.int2.addr_od)
+			dev_err(&indio_dev->dev,
+				"open drain requested but unsupported.\n");
+		else
+			sdata->int_pin_open_drain = true;
+	}
+
+	return 0;
+}
+
+static struct st_sensors_platform_data *st_sensors_dev_probe(struct device *dev,
+		struct st_sensors_platform_data *defdata)
+{
+	struct st_sensors_platform_data *pdata;
+	u32 val;
+
+	if (!dev_fwnode(dev))
+		return NULL;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+	if (!device_property_read_u32(dev, "st,drdy-int-pin", &val) && (val <= 2))
+		pdata->drdy_int_pin = (u8) val;
+	else
+		pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
+
+	pdata->open_drain = device_property_read_bool(dev, "drive-open-drain");
+
+	return pdata;
+}
+
+/**
+ * st_sensors_dev_name_probe() - device probe for ST sensor name
+ * @dev: driver model representation of the device.
+ * @name: device name buffer reference.
+ * @len: device name buffer length.
+ *
+ * In effect this function matches an ID to an internal kernel
+ * name for a certain sensor device, so that the rest of the autodetection can
+ * rely on that name from this point on. I2C/SPI devices will be renamed
+ * to match the internal kernel convention.
+ */
+void st_sensors_dev_name_probe(struct device *dev, char *name, int len)
+{
+	const void *match;
+
+	match = device_get_match_data(dev);
+	if (!match)
+		return;
+
+	/* The name from the match takes precedence if present */
+	strscpy(name, match, len);
+}
+EXPORT_SYMBOL_NS(st_sensors_dev_name_probe, IIO_ST_SENSORS);
+
+int st_sensors_init_sensor(struct iio_dev *indio_dev,
+					struct st_sensors_platform_data *pdata)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	struct st_sensors_platform_data *of_pdata;
+	int err = 0;
+
+	mutex_init(&sdata->odr_lock);
+
+	/* If OF/DT pdata exists, it will take precedence of anything else */
+	of_pdata = st_sensors_dev_probe(indio_dev->dev.parent, pdata);
+	if (IS_ERR(of_pdata))
+		return PTR_ERR(of_pdata);
+	if (of_pdata)
+		pdata = of_pdata;
+
+	if (pdata) {
+		err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
+		if (err < 0)
+			return err;
+	}
+
+	err = st_sensors_set_enable(indio_dev, false);
+	if (err < 0)
+		return err;
+
+	/* Disable DRDY, this might be still be enabled after reboot. */
+	err = st_sensors_set_dataready_irq(indio_dev, false);
+	if (err < 0)
+		return err;
+
+	if (sdata->current_fullscale) {
+		err = st_sensors_set_fullscale(indio_dev,
+						sdata->current_fullscale->num);
+		if (err < 0)
+			return err;
+	} else
+		dev_info(&indio_dev->dev, "Full-scale not possible\n");
+
+	err = st_sensors_set_odr(indio_dev, sdata->odr);
+	if (err < 0)
+		return err;
+
+	/* set BDU */
+	if (sdata->sensor_settings->bdu.addr) {
+		err = st_sensors_write_data_with_mask(indio_dev,
+					sdata->sensor_settings->bdu.addr,
+					sdata->sensor_settings->bdu.mask, true);
+		if (err < 0)
+			return err;
+	}
+
+	/* set DAS */
+	if (sdata->sensor_settings->das.addr) {
+		err = st_sensors_write_data_with_mask(indio_dev,
+					sdata->sensor_settings->das.addr,
+					sdata->sensor_settings->das.mask, 1);
+		if (err < 0)
+			return err;
+	}
+
+	if (sdata->int_pin_open_drain) {
+		u8 addr, mask;
+
+		if (sdata->drdy_int_pin == 1) {
+			addr = sdata->sensor_settings->drdy_irq.int1.addr_od;
+			mask = sdata->sensor_settings->drdy_irq.int1.mask_od;
+		} else {
+			addr = sdata->sensor_settings->drdy_irq.int2.addr_od;
+			mask = sdata->sensor_settings->drdy_irq.int2.mask_od;
+		}
+
+		dev_info(&indio_dev->dev,
+			 "set interrupt line to open drain mode on pin %d\n",
+			 sdata->drdy_int_pin);
+		err = st_sensors_write_data_with_mask(indio_dev, addr,
+						      mask, 1);
+		if (err < 0)
+			return err;
+	}
+
+	err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
+
+	return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_init_sensor, IIO_ST_SENSORS);
+
+int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
+{
+	int err;
+	u8 drdy_addr, drdy_mask;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	if (!sdata->sensor_settings->drdy_irq.int1.addr &&
+	    !sdata->sensor_settings->drdy_irq.int2.addr) {
+		/*
+		 * there are some devices (e.g. LIS3MDL) where drdy line is
+		 * routed to a given pin and it is not possible to select a
+		 * different one. Take into account irq status register
+		 * to understand if irq trigger can be properly supported
+		 */
+		if (sdata->sensor_settings->drdy_irq.stat_drdy.addr)
+			sdata->hw_irq_trigger = enable;
+		return 0;
+	}
+
+	/* Enable/Disable the interrupt generator 1. */
+	if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
+		err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->drdy_irq.ig1.en_addr,
+				sdata->sensor_settings->drdy_irq.ig1.en_mask,
+				(int)enable);
+		if (err < 0)
+			goto st_accel_set_dataready_irq_error;
+	}
+
+	if (sdata->drdy_int_pin == 1) {
+		drdy_addr = sdata->sensor_settings->drdy_irq.int1.addr;
+		drdy_mask = sdata->sensor_settings->drdy_irq.int1.mask;
+	} else {
+		drdy_addr = sdata->sensor_settings->drdy_irq.int2.addr;
+		drdy_mask = sdata->sensor_settings->drdy_irq.int2.mask;
+	}
+
+	/* Flag to the poll function that the hardware trigger is in use */
+	sdata->hw_irq_trigger = enable;
+
+	/* Enable/Disable the interrupt generator for data ready. */
+	err = st_sensors_write_data_with_mask(indio_dev, drdy_addr,
+					      drdy_mask, (int)enable);
+
+st_accel_set_dataready_irq_error:
+	return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_dataready_irq, IIO_ST_SENSORS);
+
+int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
+{
+	int err = -EINVAL, i;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+		if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
+				(sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
+			err = 0;
+			break;
+		}
+	}
+	if (err < 0)
+		goto st_sensors_match_scale_error;
+
+	err = st_sensors_set_fullscale(indio_dev,
+				sdata->sensor_settings->fs.fs_avl[i].num);
+
+st_sensors_match_scale_error:
+	return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_set_fullscale_by_gain, IIO_ST_SENSORS);
+
+static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
+				     struct iio_chan_spec const *ch, int *data)
+{
+	int err;
+	u8 *outdata;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	unsigned int byte_for_channel;
+
+	byte_for_channel = DIV_ROUND_UP(ch->scan_type.realbits +
+					ch->scan_type.shift, 8);
+	outdata = kmalloc(byte_for_channel, GFP_DMA | GFP_KERNEL);
+	if (!outdata)
+		return -ENOMEM;
+
+	err = regmap_bulk_read(sdata->regmap, ch->address,
+			       outdata, byte_for_channel);
+	if (err < 0)
+		goto st_sensors_free_memory;
+
+	if (byte_for_channel == 1)
+		*data = (s8)*outdata;
+	else if (byte_for_channel == 2)
+		*data = (s16)get_unaligned_le16(outdata);
+	else if (byte_for_channel == 3)
+		*data = (s32)sign_extend32(get_unaligned_le24(outdata), 23);
+
+st_sensors_free_memory:
+	kfree(outdata);
+
+	return err;
+}
+
+int st_sensors_read_info_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *ch, int *val)
+{
+	int err;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	err = iio_device_claim_direct_mode(indio_dev);
+	if (err)
+		return err;
+
+	mutex_lock(&sdata->odr_lock);
+
+	err = st_sensors_set_enable(indio_dev, true);
+	if (err < 0)
+		goto out;
+
+	msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
+	err = st_sensors_read_axis_data(indio_dev, ch, val);
+	if (err < 0)
+		goto out;
+
+	*val = *val >> ch->scan_type.shift;
+
+	err = st_sensors_set_enable(indio_dev, false);
+
+out:
+	mutex_unlock(&sdata->odr_lock);
+	iio_device_release_direct_mode(indio_dev);
+
+	return err;
+}
+EXPORT_SYMBOL_NS(st_sensors_read_info_raw, IIO_ST_SENSORS);
+
+/*
+ * st_sensors_get_settings_index() - get index of the sensor settings for a
+ *				     specific device from list of settings
+ * @name: device name buffer reference.
+ * @list: sensor settings list.
+ * @list_length: length of sensor settings list.
+ *
+ * Return: non negative number on success (valid index),
+ *	   negative error code otherwise.
+ */
+int st_sensors_get_settings_index(const char *name,
+				  const struct st_sensor_settings *list,
+				  const int list_length)
+{
+	int i, n;
+
+	for (i = 0; i < list_length; i++) {
+		for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
+			if (strcmp(name, list[i].sensors_supported[n]) == 0)
+				return i;
+		}
+	}
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL_NS(st_sensors_get_settings_index, IIO_ST_SENSORS);
+
+/*
+ * st_sensors_verify_id() - verify sensor ID (WhoAmI) is matching with the
+ *			    expected value
+ * @indio_dev: IIO device reference.
+ *
+ * Return: 0 on success (valid sensor ID), else a negative error code.
+ */
+int st_sensors_verify_id(struct iio_dev *indio_dev)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	int wai, err;
+
+	if (sdata->sensor_settings->wai_addr) {
+		err = regmap_read(sdata->regmap,
+				  sdata->sensor_settings->wai_addr, &wai);
+		if (err < 0) {
+			dev_err(&indio_dev->dev,
+				"failed to read Who-Am-I register.\n");
+			return err;
+		}
+
+		if (sdata->sensor_settings->wai != wai) {
+			dev_err(&indio_dev->dev,
+				"%s: WhoAmI mismatch (0x%x).\n",
+				indio_dev->name, wai);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_verify_id, IIO_ST_SENSORS);
+
+ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int i, len = 0;
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
+		if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
+			break;
+
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
+				sdata->sensor_settings->odr.odr_avl[i].hz);
+	}
+	buf[len - 1] = '\n';
+
+	return len;
+}
+EXPORT_SYMBOL_NS(st_sensors_sysfs_sampling_frequency_avail, IIO_ST_SENSORS);
+
+ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int i, len = 0, q, r;
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+		if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
+			break;
+
+		q = sdata->sensor_settings->fs.fs_avl[i].gain / 1000000;
+		r = sdata->sensor_settings->fs.fs_avl[i].gain % 1000000;
+
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ", q, r);
+	}
+	buf[len - 1] = '\n';
+
+	return len;
+}
+EXPORT_SYMBOL_NS(st_sensors_sysfs_scale_avail, IIO_ST_SENSORS);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_core.h b/drivers/iio/common/st_sensors/st_sensors_core.h
new file mode 100644
index 000000000..09f3e602a
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_core.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Local functions in the ST Sensors core
+ */
+#ifndef __ST_SENSORS_CORE_H
+#define __ST_SENSORS_CORE_H
+struct iio_dev;
+int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
+				    u8 reg_addr, u8 mask, u8 data);
+#endif
diff --git a/drivers/iio/common/st_sensors/st_sensors_i2c.c b/drivers/iio/common/st_sensors/st_sensors_i2c.c
new file mode 100644
index 000000000..ee95082c7
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors i2c library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/common/st_sensors_i2c.h>
+
+#define ST_SENSORS_I2C_MULTIREAD	0x80
+
+static const struct regmap_config st_sensors_i2c_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const struct regmap_config st_sensors_i2c_regmap_multiread_bit_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.read_flag_mask = ST_SENSORS_I2C_MULTIREAD,
+};
+
+/*
+ * st_sensors_i2c_configure() - configure I2C interface
+ * @indio_dev: IIO device reference.
+ * @client: i2c client reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+int st_sensors_i2c_configure(struct iio_dev *indio_dev,
+			     struct i2c_client *client)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	const struct regmap_config *config;
+
+	if (sdata->sensor_settings->multi_read_bit)
+		config = &st_sensors_i2c_regmap_multiread_bit_config;
+	else
+		config = &st_sensors_i2c_regmap_config;
+
+	sdata->regmap = devm_regmap_init_i2c(client, config);
+	if (IS_ERR(sdata->regmap)) {
+		dev_err(&client->dev, "Failed to register i2c regmap (%ld)\n",
+			PTR_ERR(sdata->regmap));
+		return PTR_ERR(sdata->regmap);
+	}
+
+	i2c_set_clientdata(client, indio_dev);
+
+	indio_dev->name = client->name;
+
+	sdata->irq = client->irq;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_i2c_configure, IIO_ST_SENSORS);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_spi.c b/drivers/iio/common/st_sensors/st_sensors_spi.c
new file mode 100644
index 000000000..63e302c3f
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_spi.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors spi library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include <linux/iio/common/st_sensors_spi.h>
+
+#define ST_SENSORS_SPI_MULTIREAD	0xc0
+
+static const struct regmap_config st_sensors_spi_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const struct regmap_config st_sensors_spi_regmap_multiread_bit_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.read_flag_mask = ST_SENSORS_SPI_MULTIREAD,
+};
+
+/*
+ * st_sensors_is_spi_3_wire() - check if SPI 3-wire mode has been selected
+ * @spi: spi device reference.
+ *
+ * Return: true if SPI 3-wire mode is selected, false otherwise.
+ */
+static bool st_sensors_is_spi_3_wire(struct spi_device *spi)
+{
+	struct st_sensors_platform_data *pdata;
+	struct device *dev = &spi->dev;
+
+	if (device_property_read_bool(dev, "spi-3wire"))
+		return true;
+
+	pdata = dev_get_platdata(dev);
+	if (pdata && pdata->spi_3wire)
+		return true;
+
+	return false;
+}
+
+/*
+ * st_sensors_configure_spi_3_wire() - configure SPI 3-wire if needed
+ * @spi: spi device reference.
+ * @settings: sensor specific settings reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+static int st_sensors_configure_spi_3_wire(struct spi_device *spi,
+					   struct st_sensor_settings *settings)
+{
+	if (settings->sim.addr) {
+		u8 buffer[] = {
+			settings->sim.addr,
+			settings->sim.value
+		};
+
+		return spi_write(spi, buffer, 2);
+	}
+
+	return 0;
+}
+
+/*
+ * st_sensors_spi_configure() - configure SPI interface
+ * @indio_dev: IIO device reference.
+ * @spi: spi device reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+int st_sensors_spi_configure(struct iio_dev *indio_dev,
+			     struct spi_device *spi)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	const struct regmap_config *config;
+	int err;
+
+	if (st_sensors_is_spi_3_wire(spi)) {
+		err = st_sensors_configure_spi_3_wire(spi,
+						      sdata->sensor_settings);
+		if (err < 0)
+			return err;
+	}
+
+	if (sdata->sensor_settings->multi_read_bit)
+		config = &st_sensors_spi_regmap_multiread_bit_config;
+	else
+		config = &st_sensors_spi_regmap_config;
+
+	sdata->regmap = devm_regmap_init_spi(spi, config);
+	if (IS_ERR(sdata->regmap)) {
+		dev_err(&spi->dev, "Failed to register spi regmap (%ld)\n",
+			PTR_ERR(sdata->regmap));
+		return PTR_ERR(sdata->regmap);
+	}
+
+	spi_set_drvdata(spi, indio_dev);
+
+	indio_dev->name = spi->modalias;
+
+	sdata->irq = spi->irq;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_spi_configure, IIO_ST_SENSORS);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors spi driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c
new file mode 100644
index 000000000..899b640c0
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors trigger library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/iio/common/st_sensors.h>
+#include "st_sensors_core.h"
+
+/**
+ * st_sensors_new_samples_available() - check if more samples came in
+ * @indio_dev: IIO device reference.
+ * @sdata: Sensor data.
+ *
+ * returns:
+ * false - no new samples available or read error
+ * true - new samples available
+ */
+static bool st_sensors_new_samples_available(struct iio_dev *indio_dev,
+					     struct st_sensor_data *sdata)
+{
+	int ret, status;
+
+	/* How would I know if I can't check it? */
+	if (!sdata->sensor_settings->drdy_irq.stat_drdy.addr)
+		return true;
+
+	/* No scan mask, no interrupt */
+	if (!indio_dev->active_scan_mask)
+		return false;
+
+	ret = regmap_read(sdata->regmap,
+			  sdata->sensor_settings->drdy_irq.stat_drdy.addr,
+			  &status);
+	if (ret < 0) {
+		dev_err(indio_dev->dev.parent,
+			"error checking samples available\n");
+		return false;
+	}
+
+	return !!(status & sdata->sensor_settings->drdy_irq.stat_drdy.mask);
+}
+
+/**
+ * st_sensors_irq_handler() - top half of the IRQ-based triggers
+ * @irq: irq number
+ * @p: private handler data
+ */
+static irqreturn_t st_sensors_irq_handler(int irq, void *p)
+{
+	struct iio_trigger *trig = p;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	/* Get the time stamp as close in time as possible */
+	sdata->hw_timestamp = iio_get_time_ns(indio_dev);
+	return IRQ_WAKE_THREAD;
+}
+
+/**
+ * st_sensors_irq_thread() - bottom half of the IRQ-based triggers
+ * @irq: irq number
+ * @p: private handler data
+ */
+static irqreturn_t st_sensors_irq_thread(int irq, void *p)
+{
+	struct iio_trigger *trig = p;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	/*
+	 * If this trigger is backed by a hardware interrupt and we have a
+	 * status register, check if this IRQ came from us. Notice that
+	 * we will process also if st_sensors_new_samples_available()
+	 * returns negative: if we can't check status, then poll
+	 * unconditionally.
+	 */
+	if (sdata->hw_irq_trigger &&
+	    st_sensors_new_samples_available(indio_dev, sdata)) {
+		iio_trigger_poll_chained(p);
+	} else {
+		dev_dbg(indio_dev->dev.parent, "spurious IRQ\n");
+		return IRQ_NONE;
+	}
+
+	/*
+	 * If we have proper level IRQs the handler will be re-entered if
+	 * the line is still active, so return here and come back in through
+	 * the top half if need be.
+	 */
+	if (!sdata->edge_irq)
+		return IRQ_HANDLED;
+
+	/*
+	 * If we are using edge IRQs, new samples arrived while processing
+	 * the IRQ and those may be missed unless we pick them here, so poll
+	 * again. If the sensor delivery frequency is very high, this thread
+	 * turns into a polled loop handler.
+	 */
+	while (sdata->hw_irq_trigger &&
+	       st_sensors_new_samples_available(indio_dev, sdata)) {
+		dev_dbg(indio_dev->dev.parent,
+			"more samples came in during polling\n");
+		sdata->hw_timestamp = iio_get_time_ns(indio_dev);
+		iio_trigger_poll_chained(p);
+	}
+
+	return IRQ_HANDLED;
+}
+
+int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
+				const struct iio_trigger_ops *trigger_ops)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	struct device *parent = indio_dev->dev.parent;
+	unsigned long irq_trig;
+	int err;
+
+	sdata->trig = devm_iio_trigger_alloc(parent, "%s-trigger",
+					     indio_dev->name);
+	if (sdata->trig == NULL) {
+		dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n");
+		return -ENOMEM;
+	}
+
+	iio_trigger_set_drvdata(sdata->trig, indio_dev);
+	sdata->trig->ops = trigger_ops;
+
+	irq_trig = irqd_get_trigger_type(irq_get_irq_data(sdata->irq));
+	/*
+	 * If the IRQ is triggered on falling edge, we need to mark the
+	 * interrupt as active low, if the hardware supports this.
+	 */
+	switch(irq_trig) {
+	case IRQF_TRIGGER_FALLING:
+	case IRQF_TRIGGER_LOW:
+		if (!sdata->sensor_settings->drdy_irq.addr_ihl) {
+			dev_err(&indio_dev->dev,
+				"falling/low specified for IRQ but hardware supports only rising/high: will request rising/high\n");
+			if (irq_trig == IRQF_TRIGGER_FALLING)
+				irq_trig = IRQF_TRIGGER_RISING;
+			if (irq_trig == IRQF_TRIGGER_LOW)
+				irq_trig = IRQF_TRIGGER_HIGH;
+		} else {
+			/* Set up INT active low i.e. falling edge */
+			err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->drdy_irq.addr_ihl,
+				sdata->sensor_settings->drdy_irq.mask_ihl, 1);
+			if (err < 0)
+				return err;
+			dev_info(&indio_dev->dev,
+				 "interrupts on the falling edge or active low level\n");
+		}
+		break;
+	case IRQF_TRIGGER_RISING:
+		dev_info(&indio_dev->dev,
+			 "interrupts on the rising edge\n");
+		break;
+	case IRQF_TRIGGER_HIGH:
+		dev_info(&indio_dev->dev,
+			 "interrupts active high level\n");
+		break;
+	default:
+		/* This is the most preferred mode, if possible */
+		dev_err(&indio_dev->dev,
+			"unsupported IRQ trigger specified (%lx), enforce rising edge\n", irq_trig);
+		irq_trig = IRQF_TRIGGER_RISING;
+	}
+
+	/* Tell the interrupt handler that we're dealing with edges */
+	if (irq_trig == IRQF_TRIGGER_FALLING ||
+	    irq_trig == IRQF_TRIGGER_RISING) {
+		if (!sdata->sensor_settings->drdy_irq.stat_drdy.addr) {
+			dev_err(&indio_dev->dev,
+				"edge IRQ not supported w/o stat register.\n");
+			return -EOPNOTSUPP;
+		}
+		sdata->edge_irq = true;
+	} else {
+		/*
+		 * If we're not using edges (i.e. level interrupts) we
+		 * just mask off the IRQ, handle one interrupt, then
+		 * if the line is still low, we return to the
+		 * interrupt handler top half again and start over.
+		 */
+		irq_trig |= IRQF_ONESHOT;
+	}
+
+	/*
+	 * If the interrupt pin is Open Drain, by definition this
+	 * means that the interrupt line may be shared with other
+	 * peripherals. But to do this we also need to have a status
+	 * register and mask to figure out if this sensor was firing
+	 * the IRQ or not, so we can tell the interrupt handle that
+	 * it was "our" interrupt.
+	 */
+	if (sdata->int_pin_open_drain &&
+	    sdata->sensor_settings->drdy_irq.stat_drdy.addr)
+		irq_trig |= IRQF_SHARED;
+
+	err = devm_request_threaded_irq(parent,
+					sdata->irq,
+					st_sensors_irq_handler,
+					st_sensors_irq_thread,
+					irq_trig,
+					sdata->trig->name,
+					sdata->trig);
+	if (err) {
+		dev_err(&indio_dev->dev, "failed to request trigger IRQ.\n");
+		return err;
+	}
+
+	err = devm_iio_trigger_register(parent, sdata->trig);
+	if (err < 0) {
+		dev_err(&indio_dev->dev, "failed to register iio trigger.\n");
+		return err;
+	}
+	indio_dev->trig = iio_trigger_get(sdata->trig);
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_allocate_trigger, IIO_ST_SENSORS);
+
+int st_sensors_validate_device(struct iio_trigger *trig,
+			       struct iio_dev *indio_dev)
+{
+	struct iio_dev *indio = iio_trigger_get_drvdata(trig);
+
+	if (indio != indio_dev)
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_validate_device, IIO_ST_SENSORS);