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, 730 insertions, 0 deletions

diff --git a/drivers/iio/common/scmi_sensors/scmi_iio.c b/drivers/iio/common/scmi_sensors/scmi_iio.c
new file mode 100644
index 000000000..d92f7f651
--- /dev/null
+++ b/drivers/iio/common/scmi_sensors/scmi_iio.c
@@ -0,0 +1,730 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * System Control and Management Interface(SCMI) based IIO sensor driver
+ *
+ * Copyright (C) 2021 Google LLC
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/sysfs.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/scmi_protocol.h>
+#include <linux/time.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#define SCMI_IIO_NUM_OF_AXIS 3
+
+struct scmi_iio_priv {
+	const struct scmi_sensor_proto_ops *sensor_ops;
+	struct scmi_protocol_handle *ph;
+	const struct scmi_sensor_info *sensor_info;
+	struct iio_dev *indio_dev;
+	/* lock to protect against multiple access to the device */
+	struct mutex lock;
+	/* adding one additional channel for timestamp */
+	s64 iio_buf[SCMI_IIO_NUM_OF_AXIS + 1];
+	struct notifier_block sensor_update_nb;
+	u32 *freq_avail;
+};
+
+static int scmi_iio_sensor_update_cb(struct notifier_block *nb,
+				     unsigned long event, void *data)
+{
+	struct scmi_sensor_update_report *sensor_update = data;
+	struct iio_dev *scmi_iio_dev;
+	struct scmi_iio_priv *sensor;
+	s8 tstamp_scale;
+	u64 time, time_ns;
+	int i;
+
+	if (sensor_update->readings_count == 0)
+		return NOTIFY_DONE;
+
+	sensor = container_of(nb, struct scmi_iio_priv, sensor_update_nb);
+
+	for (i = 0; i < sensor_update->readings_count; i++)
+		sensor->iio_buf[i] = sensor_update->readings[i].value;
+
+	if (!sensor->sensor_info->timestamped) {
+		time_ns = ktime_to_ns(sensor_update->timestamp);
+	} else {
+		/*
+		 *  All the axes are supposed to have the same value for timestamp.
+		 *  We are just using the values from the Axis 0 here.
+		 */
+		time = sensor_update->readings[0].timestamp;
+
+		/*
+		 *  Timestamp returned by SCMI is in seconds and is equal to
+		 *  time * power-of-10 multiplier(tstamp_scale) seconds.
+		 *  Converting the timestamp to nanoseconds below.
+		 */
+		tstamp_scale = sensor->sensor_info->tstamp_scale +
+			       const_ilog2(NSEC_PER_SEC) / const_ilog2(10);
+		if (tstamp_scale < 0) {
+			do_div(time, int_pow(10, abs(tstamp_scale)));
+			time_ns = time;
+		} else {
+			time_ns = time * int_pow(10, tstamp_scale);
+		}
+	}
+
+	scmi_iio_dev = sensor->indio_dev;
+	iio_push_to_buffers_with_timestamp(scmi_iio_dev, sensor->iio_buf,
+					   time_ns);
+	return NOTIFY_OK;
+}
+
+static int scmi_iio_buffer_preenable(struct iio_dev *iio_dev)
+{
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	u32 sensor_config = 0;
+	int err;
+
+	if (sensor->sensor_info->timestamped)
+		sensor_config |= FIELD_PREP(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK,
+					    SCMI_SENS_CFG_TSTAMP_ENABLE);
+
+	sensor_config |= FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+				    SCMI_SENS_CFG_SENSOR_ENABLE);
+	err = sensor->sensor_ops->config_set(sensor->ph,
+					     sensor->sensor_info->id,
+					     sensor_config);
+	if (err)
+		dev_err(&iio_dev->dev, "Error in enabling sensor %s err %d",
+			sensor->sensor_info->name, err);
+
+	return err;
+}
+
+static int scmi_iio_buffer_postdisable(struct iio_dev *iio_dev)
+{
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	u32 sensor_config = 0;
+	int err;
+
+	sensor_config |= FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+				    SCMI_SENS_CFG_SENSOR_DISABLE);
+	err = sensor->sensor_ops->config_set(sensor->ph,
+					     sensor->sensor_info->id,
+					     sensor_config);
+	if (err) {
+		dev_err(&iio_dev->dev,
+			"Error in disabling sensor %s with err %d",
+			sensor->sensor_info->name, err);
+	}
+
+	return err;
+}
+
+static const struct iio_buffer_setup_ops scmi_iio_buffer_ops = {
+	.preenable = scmi_iio_buffer_preenable,
+	.postdisable = scmi_iio_buffer_postdisable,
+};
+
+static int scmi_iio_set_odr_val(struct iio_dev *iio_dev, int val, int val2)
+{
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	u64 sec, mult, uHz, sf;
+	u32 sensor_config;
+	char buf[32];
+
+	int err = sensor->sensor_ops->config_get(sensor->ph,
+						 sensor->sensor_info->id,
+						 &sensor_config);
+	if (err) {
+		dev_err(&iio_dev->dev,
+			"Error in getting sensor config for sensor %s err %d",
+			sensor->sensor_info->name, err);
+		return err;
+	}
+
+	uHz = val * MICROHZ_PER_HZ + val2;
+
+	/*
+	 * The seconds field in the sensor interval in SCMI is 16 bits long
+	 * Therefore seconds  = 1/Hz <= 0xFFFF. As floating point calculations are
+	 * discouraged in the kernel driver code, to calculate the scale factor (sf)
+	 * (1* 1000000 * sf)/uHz <= 0xFFFF. Therefore, sf <= (uHz * 0xFFFF)/1000000
+	 * To calculate the multiplier,we convert the sf into char string  and
+	 * count the number of characters
+	 */
+	sf = (u64)uHz * 0xFFFF;
+	do_div(sf,  MICROHZ_PER_HZ);
+	mult = scnprintf(buf, sizeof(buf), "%llu", sf) - 1;
+
+	sec = int_pow(10, mult) * MICROHZ_PER_HZ;
+	do_div(sec, uHz);
+	if (sec == 0) {
+		dev_err(&iio_dev->dev,
+			"Trying to set invalid sensor update value for sensor %s",
+			sensor->sensor_info->name);
+		return -EINVAL;
+	}
+
+	sensor_config &= ~SCMI_SENS_CFG_UPDATE_SECS_MASK;
+	sensor_config |= FIELD_PREP(SCMI_SENS_CFG_UPDATE_SECS_MASK, sec);
+	sensor_config &= ~SCMI_SENS_CFG_UPDATE_EXP_MASK;
+	sensor_config |= FIELD_PREP(SCMI_SENS_CFG_UPDATE_EXP_MASK, -mult);
+
+	if (sensor->sensor_info->timestamped) {
+		sensor_config &= ~SCMI_SENS_CFG_TSTAMP_ENABLED_MASK;
+		sensor_config |= FIELD_PREP(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK,
+					    SCMI_SENS_CFG_TSTAMP_ENABLE);
+	}
+
+	sensor_config &= ~SCMI_SENS_CFG_ROUND_MASK;
+	sensor_config |=
+		FIELD_PREP(SCMI_SENS_CFG_ROUND_MASK, SCMI_SENS_CFG_ROUND_AUTO);
+
+	err = sensor->sensor_ops->config_set(sensor->ph,
+					     sensor->sensor_info->id,
+					     sensor_config);
+	if (err)
+		dev_err(&iio_dev->dev,
+			"Error in setting sensor update interval for sensor %s value %u err %d",
+			sensor->sensor_info->name, sensor_config, err);
+
+	return err;
+}
+
+static int scmi_iio_write_raw(struct iio_dev *iio_dev,
+			      struct iio_chan_spec const *chan, int val,
+			      int val2, long mask)
+{
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	int err;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		mutex_lock(&sensor->lock);
+		err = scmi_iio_set_odr_val(iio_dev, val, val2);
+		mutex_unlock(&sensor->lock);
+		return err;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int scmi_iio_read_avail(struct iio_dev *iio_dev,
+			       struct iio_chan_spec const *chan,
+			       const int **vals, int *type, int *length,
+			       long mask)
+{
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*vals = sensor->freq_avail;
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		*length = sensor->sensor_info->intervals.count * 2;
+		if (sensor->sensor_info->intervals.segmented)
+			return IIO_AVAIL_RANGE;
+		else
+			return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static void convert_ns_to_freq(u64 interval_ns, u64 *hz, u64 *uhz)
+{
+	u64 rem, freq;
+
+	freq = NSEC_PER_SEC;
+	rem = do_div(freq, interval_ns);
+	*hz = freq;
+	*uhz = rem * 1000000UL;
+	do_div(*uhz, interval_ns);
+}
+
+static int scmi_iio_get_odr_val(struct iio_dev *iio_dev, int *val, int *val2)
+{
+	u64 sensor_update_interval, sensor_interval_mult, hz, uhz;
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	u32 sensor_config;
+	int mult;
+
+	int err = sensor->sensor_ops->config_get(sensor->ph,
+						 sensor->sensor_info->id,
+						 &sensor_config);
+	if (err) {
+		dev_err(&iio_dev->dev,
+			"Error in getting sensor config for sensor %s err %d",
+			sensor->sensor_info->name, err);
+		return err;
+	}
+
+	sensor_update_interval =
+		SCMI_SENS_CFG_GET_UPDATE_SECS(sensor_config) * NSEC_PER_SEC;
+
+	mult = SCMI_SENS_CFG_GET_UPDATE_EXP(sensor_config);
+	if (mult < 0) {
+		sensor_interval_mult = int_pow(10, abs(mult));
+		do_div(sensor_update_interval, sensor_interval_mult);
+	} else {
+		sensor_interval_mult = int_pow(10, mult);
+		sensor_update_interval =
+			sensor_update_interval * sensor_interval_mult;
+	}
+
+	convert_ns_to_freq(sensor_update_interval, &hz, &uhz);
+	*val = hz;
+	*val2 = uhz;
+	return 0;
+}
+
+static int scmi_iio_read_channel_data(struct iio_dev *iio_dev,
+			     struct iio_chan_spec const *ch, int *val, int *val2)
+{
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	u32 sensor_config;
+	struct scmi_sensor_reading readings[SCMI_IIO_NUM_OF_AXIS];
+	int err;
+
+	sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+					SCMI_SENS_CFG_SENSOR_ENABLE);
+	err = sensor->sensor_ops->config_set(
+		sensor->ph, sensor->sensor_info->id, sensor_config);
+	if (err) {
+		dev_err(&iio_dev->dev,
+			"Error in enabling sensor %s err %d",
+			sensor->sensor_info->name, err);
+		return err;
+	}
+
+	err = sensor->sensor_ops->reading_get_timestamped(
+		sensor->ph, sensor->sensor_info->id,
+		sensor->sensor_info->num_axis, readings);
+	if (err) {
+		dev_err(&iio_dev->dev,
+			"Error in reading raw attribute for sensor %s err %d",
+			sensor->sensor_info->name, err);
+		return err;
+	}
+
+	sensor_config = FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK,
+					SCMI_SENS_CFG_SENSOR_DISABLE);
+	err = sensor->sensor_ops->config_set(
+		sensor->ph, sensor->sensor_info->id, sensor_config);
+	if (err) {
+		dev_err(&iio_dev->dev,
+			"Error in disabling sensor %s err %d",
+			sensor->sensor_info->name, err);
+		return err;
+	}
+
+	*val = lower_32_bits(readings[ch->scan_index].value);
+	*val2 = upper_32_bits(readings[ch->scan_index].value);
+
+	return IIO_VAL_INT_64;
+}
+
+static int scmi_iio_read_raw(struct iio_dev *iio_dev,
+			     struct iio_chan_spec const *ch, int *val,
+			     int *val2, long mask)
+{
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	s8 scale;
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		scale = sensor->sensor_info->axis[ch->scan_index].scale;
+		if (scale < 0) {
+			*val = 1;
+			*val2 = int_pow(10, abs(scale));
+			return IIO_VAL_FRACTIONAL;
+		}
+		*val = int_pow(10, scale);
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		ret = scmi_iio_get_odr_val(iio_dev, val, val2);
+		return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(iio_dev);
+		if (ret)
+			return ret;
+
+		ret = scmi_iio_read_channel_data(iio_dev, ch, val, val2);
+		iio_device_release_direct_mode(iio_dev);
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info scmi_iio_info = {
+	.read_raw = scmi_iio_read_raw,
+	.read_avail = scmi_iio_read_avail,
+	.write_raw = scmi_iio_write_raw,
+};
+
+static ssize_t scmi_iio_get_raw_available(struct iio_dev *iio_dev,
+					  uintptr_t private,
+					  const struct iio_chan_spec *chan,
+					  char *buf)
+{
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	u64 resolution, rem;
+	s64 min_range, max_range;
+	s8 exponent, scale;
+	int len = 0;
+
+	/*
+	 * All the axes are supposed to have the same value for range and resolution.
+	 * We are just using the values from the Axis 0 here.
+	 */
+	if (sensor->sensor_info->axis[0].extended_attrs) {
+		min_range = sensor->sensor_info->axis[0].attrs.min_range;
+		max_range = sensor->sensor_info->axis[0].attrs.max_range;
+		resolution = sensor->sensor_info->axis[0].resolution;
+		exponent = sensor->sensor_info->axis[0].exponent;
+		scale = sensor->sensor_info->axis[0].scale;
+
+		/*
+		 * To provide the raw value for the resolution to the userspace,
+		 * need to divide the resolution exponent by the sensor scale
+		 */
+		exponent = exponent - scale;
+		if (exponent < 0) {
+			rem = do_div(resolution,
+				     int_pow(10, abs(exponent))
+				     );
+			len = scnprintf(buf, PAGE_SIZE,
+					"[%lld %llu.%llu %lld]\n", min_range,
+					resolution, rem, max_range);
+		} else {
+			resolution = resolution * int_pow(10, exponent);
+			len = scnprintf(buf, PAGE_SIZE, "[%lld %llu %lld]\n",
+					min_range, resolution, max_range);
+		}
+	}
+	return len;
+}
+
+static const struct iio_chan_spec_ext_info scmi_iio_ext_info[] = {
+	{
+		.name = "raw_available",
+		.read = scmi_iio_get_raw_available,
+		.shared = IIO_SHARED_BY_TYPE,
+	},
+	{},
+};
+
+static void scmi_iio_set_timestamp_channel(struct iio_chan_spec *iio_chan,
+					   int scan_index)
+{
+	iio_chan->type = IIO_TIMESTAMP;
+	iio_chan->channel = -1;
+	iio_chan->scan_index = scan_index;
+	iio_chan->scan_type.sign = 'u';
+	iio_chan->scan_type.realbits = 64;
+	iio_chan->scan_type.storagebits = 64;
+}
+
+static void scmi_iio_set_data_channel(struct iio_chan_spec *iio_chan,
+				      enum iio_chan_type type,
+				      enum iio_modifier mod, int scan_index)
+{
+	iio_chan->type = type;
+	iio_chan->modified = 1;
+	iio_chan->channel2 = mod;
+	iio_chan->info_mask_separate =
+		BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_RAW);
+	iio_chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ);
+	iio_chan->info_mask_shared_by_type_available =
+		BIT(IIO_CHAN_INFO_SAMP_FREQ);
+	iio_chan->scan_index = scan_index;
+	iio_chan->scan_type.sign = 's';
+	iio_chan->scan_type.realbits = 64;
+	iio_chan->scan_type.storagebits = 64;
+	iio_chan->scan_type.endianness = IIO_LE;
+	iio_chan->ext_info = scmi_iio_ext_info;
+}
+
+static int scmi_iio_get_chan_modifier(const char *name,
+				      enum iio_modifier *modifier)
+{
+	char *pch, mod;
+
+	if (!name)
+		return -EINVAL;
+
+	pch = strrchr(name, '_');
+	if (!pch)
+		return -EINVAL;
+
+	mod = *(pch + 1);
+	switch (mod) {
+	case 'X':
+		*modifier = IIO_MOD_X;
+		return 0;
+	case 'Y':
+		*modifier = IIO_MOD_Y;
+		return 0;
+	case 'Z':
+		*modifier = IIO_MOD_Z;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int scmi_iio_get_chan_type(u8 scmi_type, enum iio_chan_type *iio_type)
+{
+	switch (scmi_type) {
+	case METERS_SEC_SQUARED:
+		*iio_type = IIO_ACCEL;
+		return 0;
+	case RADIANS_SEC:
+		*iio_type = IIO_ANGL_VEL;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static u64 scmi_iio_convert_interval_to_ns(u32 val)
+{
+	u64 sensor_update_interval =
+		SCMI_SENS_INTVL_GET_SECS(val) * NSEC_PER_SEC;
+	u64 sensor_interval_mult;
+	int mult;
+
+	mult = SCMI_SENS_INTVL_GET_EXP(val);
+	if (mult < 0) {
+		sensor_interval_mult = int_pow(10, abs(mult));
+		do_div(sensor_update_interval, sensor_interval_mult);
+	} else {
+		sensor_interval_mult = int_pow(10, mult);
+		sensor_update_interval =
+			sensor_update_interval * sensor_interval_mult;
+	}
+	return sensor_update_interval;
+}
+
+static int scmi_iio_set_sampling_freq_avail(struct iio_dev *iio_dev)
+{
+	u64 cur_interval_ns, low_interval_ns, high_interval_ns, step_size_ns,
+		hz, uhz;
+	unsigned int cur_interval, low_interval, high_interval, step_size;
+	struct scmi_iio_priv *sensor = iio_priv(iio_dev);
+	int i;
+
+	sensor->freq_avail =
+		devm_kzalloc(&iio_dev->dev,
+			     sizeof(*sensor->freq_avail) *
+				     (sensor->sensor_info->intervals.count * 2),
+			     GFP_KERNEL);
+	if (!sensor->freq_avail)
+		return -ENOMEM;
+
+	if (sensor->sensor_info->intervals.segmented) {
+		low_interval = sensor->sensor_info->intervals
+				       .desc[SCMI_SENS_INTVL_SEGMENT_LOW];
+		low_interval_ns = scmi_iio_convert_interval_to_ns(low_interval);
+		convert_ns_to_freq(low_interval_ns, &hz, &uhz);
+		sensor->freq_avail[0] = hz;
+		sensor->freq_avail[1] = uhz;
+
+		step_size = sensor->sensor_info->intervals
+				    .desc[SCMI_SENS_INTVL_SEGMENT_STEP];
+		step_size_ns = scmi_iio_convert_interval_to_ns(step_size);
+		convert_ns_to_freq(step_size_ns, &hz, &uhz);
+		sensor->freq_avail[2] = hz;
+		sensor->freq_avail[3] = uhz;
+
+		high_interval = sensor->sensor_info->intervals
+					.desc[SCMI_SENS_INTVL_SEGMENT_HIGH];
+		high_interval_ns =
+			scmi_iio_convert_interval_to_ns(high_interval);
+		convert_ns_to_freq(high_interval_ns, &hz, &uhz);
+		sensor->freq_avail[4] = hz;
+		sensor->freq_avail[5] = uhz;
+	} else {
+		for (i = 0; i < sensor->sensor_info->intervals.count; i++) {
+			cur_interval = sensor->sensor_info->intervals.desc[i];
+			cur_interval_ns =
+				scmi_iio_convert_interval_to_ns(cur_interval);
+			convert_ns_to_freq(cur_interval_ns, &hz, &uhz);
+			sensor->freq_avail[i * 2] = hz;
+			sensor->freq_avail[i * 2 + 1] = uhz;
+		}
+	}
+	return 0;
+}
+
+static struct iio_dev *
+scmi_alloc_iiodev(struct scmi_device *sdev,
+		  const struct scmi_sensor_proto_ops *ops,
+		  struct scmi_protocol_handle *ph,
+		  const struct scmi_sensor_info *sensor_info)
+{
+	struct iio_chan_spec *iio_channels;
+	struct scmi_iio_priv *sensor;
+	enum iio_modifier modifier;
+	enum iio_chan_type type;
+	struct iio_dev *iiodev;
+	struct device *dev = &sdev->dev;
+	const struct scmi_handle *handle = sdev->handle;
+	int i, ret;
+
+	iiodev = devm_iio_device_alloc(dev, sizeof(*sensor));
+	if (!iiodev)
+		return ERR_PTR(-ENOMEM);
+
+	iiodev->modes = INDIO_DIRECT_MODE;
+	sensor = iio_priv(iiodev);
+	sensor->sensor_ops = ops;
+	sensor->ph = ph;
+	sensor->sensor_info = sensor_info;
+	sensor->sensor_update_nb.notifier_call = scmi_iio_sensor_update_cb;
+	sensor->indio_dev = iiodev;
+	mutex_init(&sensor->lock);
+
+	/* adding one additional channel for timestamp */
+	iiodev->num_channels = sensor_info->num_axis + 1;
+	iiodev->name = sensor_info->name;
+	iiodev->info = &scmi_iio_info;
+
+	iio_channels =
+		devm_kzalloc(dev,
+			     sizeof(*iio_channels) * (iiodev->num_channels),
+			     GFP_KERNEL);
+	if (!iio_channels)
+		return ERR_PTR(-ENOMEM);
+
+	ret = scmi_iio_set_sampling_freq_avail(iiodev);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	for (i = 0; i < sensor_info->num_axis; i++) {
+		ret = scmi_iio_get_chan_type(sensor_info->axis[i].type, &type);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
+		ret = scmi_iio_get_chan_modifier(sensor_info->axis[i].name,
+						 &modifier);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
+		scmi_iio_set_data_channel(&iio_channels[i], type, modifier,
+					  sensor_info->axis[i].id);
+	}
+
+	ret = handle->notify_ops->devm_event_notifier_register(sdev,
+				SCMI_PROTOCOL_SENSOR, SCMI_EVENT_SENSOR_UPDATE,
+				&sensor->sensor_info->id,
+				&sensor->sensor_update_nb);
+	if (ret) {
+		dev_err(&iiodev->dev,
+			"Error in registering sensor update notifier for sensor %s err %d",
+			sensor->sensor_info->name, ret);
+		return ERR_PTR(ret);
+	}
+
+	scmi_iio_set_timestamp_channel(&iio_channels[i], i);
+	iiodev->channels = iio_channels;
+	return iiodev;
+}
+
+static int scmi_iio_dev_probe(struct scmi_device *sdev)
+{
+	const struct scmi_sensor_info *sensor_info;
+	struct scmi_handle *handle = sdev->handle;
+	const struct scmi_sensor_proto_ops *sensor_ops;
+	struct scmi_protocol_handle *ph;
+	struct device *dev = &sdev->dev;
+	struct iio_dev *scmi_iio_dev;
+	u16 nr_sensors;
+	int err = -ENODEV, i;
+
+	if (!handle)
+		return -ENODEV;
+
+	sensor_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_SENSOR, &ph);
+	if (IS_ERR(sensor_ops)) {
+		dev_err(dev, "SCMI device has no sensor interface\n");
+		return PTR_ERR(sensor_ops);
+	}
+
+	nr_sensors = sensor_ops->count_get(ph);
+	if (!nr_sensors) {
+		dev_dbg(dev, "0 sensors found via SCMI bus\n");
+		return -ENODEV;
+	}
+
+	for (i = 0; i < nr_sensors; i++) {
+		sensor_info = sensor_ops->info_get(ph, i);
+		if (!sensor_info) {
+			dev_err(dev, "SCMI sensor %d has missing info\n", i);
+			return -EINVAL;
+		}
+
+		/* This driver only supports 3-axis accel and gyro, skipping other sensors */
+		if (sensor_info->num_axis != SCMI_IIO_NUM_OF_AXIS)
+			continue;
+
+		/* This driver only supports 3-axis accel and gyro, skipping other sensors */
+		if (sensor_info->axis[0].type != METERS_SEC_SQUARED &&
+		    sensor_info->axis[0].type != RADIANS_SEC)
+			continue;
+
+		scmi_iio_dev = scmi_alloc_iiodev(sdev, sensor_ops, ph,
+						 sensor_info);
+		if (IS_ERR(scmi_iio_dev)) {
+			dev_err(dev,
+				"failed to allocate IIO device for sensor %s: %ld\n",
+				sensor_info->name, PTR_ERR(scmi_iio_dev));
+			return PTR_ERR(scmi_iio_dev);
+		}
+
+		err = devm_iio_kfifo_buffer_setup(&scmi_iio_dev->dev,
+						  scmi_iio_dev,
+						  &scmi_iio_buffer_ops);
+		if (err < 0) {
+			dev_err(dev,
+				"IIO buffer setup error at sensor %s: %d\n",
+				sensor_info->name, err);
+			return err;
+		}
+
+		err = devm_iio_device_register(dev, scmi_iio_dev);
+		if (err) {
+			dev_err(dev,
+				"IIO device registration failed at sensor %s: %d\n",
+				sensor_info->name, err);
+			return err;
+		}
+	}
+	return err;
+}
+
+static const struct scmi_device_id scmi_id_table[] = {
+	{ SCMI_PROTOCOL_SENSOR, "iiodev" },
+	{},
+};
+
+MODULE_DEVICE_TABLE(scmi, scmi_id_table);
+
+static struct scmi_driver scmi_iiodev_driver = {
+	.name = "scmi-sensor-iiodev",
+	.probe = scmi_iio_dev_probe,
+	.id_table = scmi_id_table,
+};
+
+module_scmi_driver(scmi_iiodev_driver);
+
+MODULE_AUTHOR("Jyoti Bhayana <jbhayana@google.com>");
+MODULE_DESCRIPTION("SCMI IIO Driver");
+MODULE_LICENSE("GPL v2");