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, 964 insertions, 0 deletions

diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
new file mode 100644
index 000000000..ef5e0e46f
--- /dev/null
+++ b/drivers/iio/chemical/bme680_core.c
@@ -0,0 +1,964 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Bosch BME680 - Temperature, Pressure, Humidity & Gas Sensor
+ *
+ * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH
+ * Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com>
+ *
+ * Datasheet:
+ * https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME680-DS001-00.pdf
+ */
+#include <linux/acpi.h>
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/log2.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "bme680.h"
+
+struct bme680_calib {
+	u16 par_t1;
+	s16 par_t2;
+	s8  par_t3;
+	u16 par_p1;
+	s16 par_p2;
+	s8  par_p3;
+	s16 par_p4;
+	s16 par_p5;
+	s8  par_p6;
+	s8  par_p7;
+	s16 par_p8;
+	s16 par_p9;
+	u8  par_p10;
+	u16 par_h1;
+	u16 par_h2;
+	s8  par_h3;
+	s8  par_h4;
+	s8  par_h5;
+	s8  par_h6;
+	s8  par_h7;
+	s8  par_gh1;
+	s16 par_gh2;
+	s8  par_gh3;
+	u8  res_heat_range;
+	s8  res_heat_val;
+	s8  range_sw_err;
+};
+
+struct bme680_data {
+	struct regmap *regmap;
+	struct bme680_calib bme680;
+	u8 oversampling_temp;
+	u8 oversampling_press;
+	u8 oversampling_humid;
+	u16 heater_dur;
+	u16 heater_temp;
+	/*
+	 * Carryover value from temperature conversion, used in pressure
+	 * and humidity compensation calculations.
+	 */
+	s32 t_fine;
+};
+
+static const struct regmap_range bme680_volatile_ranges[] = {
+	regmap_reg_range(BME680_REG_MEAS_STAT_0, BME680_REG_GAS_R_LSB),
+	regmap_reg_range(BME680_REG_STATUS, BME680_REG_STATUS),
+	regmap_reg_range(BME680_T2_LSB_REG, BME680_GH3_REG),
+};
+
+static const struct regmap_access_table bme680_volatile_table = {
+	.yes_ranges	= bme680_volatile_ranges,
+	.n_yes_ranges	= ARRAY_SIZE(bme680_volatile_ranges),
+};
+
+const struct regmap_config bme680_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xef,
+	.volatile_table = &bme680_volatile_table,
+	.cache_type = REGCACHE_RBTREE,
+};
+EXPORT_SYMBOL_NS(bme680_regmap_config, IIO_BME680);
+
+static const struct iio_chan_spec bme680_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+	},
+	{
+		.type = IIO_PRESSURE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+	},
+	{
+		.type = IIO_HUMIDITYRELATIVE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				      BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+	},
+	{
+		.type = IIO_RESISTANCE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+	},
+};
+
+static int bme680_read_calib(struct bme680_data *data,
+			     struct bme680_calib *calib)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	unsigned int tmp, tmp_msb, tmp_lsb;
+	int ret;
+	__le16 buf;
+
+	/* Temperature related coefficients */
+	ret = regmap_bulk_read(data->regmap, BME680_T1_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_T1_LSB_REG\n");
+		return ret;
+	}
+	calib->par_t1 = le16_to_cpu(buf);
+
+	ret = regmap_bulk_read(data->regmap, BME680_T2_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_T2_LSB_REG\n");
+		return ret;
+	}
+	calib->par_t2 = le16_to_cpu(buf);
+
+	ret = regmap_read(data->regmap, BME680_T3_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_T3_REG\n");
+		return ret;
+	}
+	calib->par_t3 = tmp;
+
+	/* Pressure related coefficients */
+	ret = regmap_bulk_read(data->regmap, BME680_P1_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P1_LSB_REG\n");
+		return ret;
+	}
+	calib->par_p1 = le16_to_cpu(buf);
+
+	ret = regmap_bulk_read(data->regmap, BME680_P2_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P2_LSB_REG\n");
+		return ret;
+	}
+	calib->par_p2 = le16_to_cpu(buf);
+
+	ret = regmap_read(data->regmap, BME680_P3_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P3_REG\n");
+		return ret;
+	}
+	calib->par_p3 = tmp;
+
+	ret = regmap_bulk_read(data->regmap, BME680_P4_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P4_LSB_REG\n");
+		return ret;
+	}
+	calib->par_p4 = le16_to_cpu(buf);
+
+	ret = regmap_bulk_read(data->regmap, BME680_P5_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P5_LSB_REG\n");
+		return ret;
+	}
+	calib->par_p5 = le16_to_cpu(buf);
+
+	ret = regmap_read(data->regmap, BME680_P6_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P6_REG\n");
+		return ret;
+	}
+	calib->par_p6 = tmp;
+
+	ret = regmap_read(data->regmap, BME680_P7_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P7_REG\n");
+		return ret;
+	}
+	calib->par_p7 = tmp;
+
+	ret = regmap_bulk_read(data->regmap, BME680_P8_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P8_LSB_REG\n");
+		return ret;
+	}
+	calib->par_p8 = le16_to_cpu(buf);
+
+	ret = regmap_bulk_read(data->regmap, BME680_P9_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P9_LSB_REG\n");
+		return ret;
+	}
+	calib->par_p9 = le16_to_cpu(buf);
+
+	ret = regmap_read(data->regmap, BME680_P10_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_P10_REG\n");
+		return ret;
+	}
+	calib->par_p10 = tmp;
+
+	/* Humidity related coefficients */
+	ret = regmap_read(data->regmap, BME680_H1_MSB_REG, &tmp_msb);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H1_MSB_REG\n");
+		return ret;
+	}
+	ret = regmap_read(data->regmap, BME680_H1_LSB_REG, &tmp_lsb);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H1_LSB_REG\n");
+		return ret;
+	}
+	calib->par_h1 = (tmp_msb << BME680_HUM_REG_SHIFT_VAL) |
+			(tmp_lsb & BME680_BIT_H1_DATA_MASK);
+
+	ret = regmap_read(data->regmap, BME680_H2_MSB_REG, &tmp_msb);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H2_MSB_REG\n");
+		return ret;
+	}
+	ret = regmap_read(data->regmap, BME680_H2_LSB_REG, &tmp_lsb);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H2_LSB_REG\n");
+		return ret;
+	}
+	calib->par_h2 = (tmp_msb << BME680_HUM_REG_SHIFT_VAL) |
+			(tmp_lsb >> BME680_HUM_REG_SHIFT_VAL);
+
+	ret = regmap_read(data->regmap, BME680_H3_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H3_REG\n");
+		return ret;
+	}
+	calib->par_h3 = tmp;
+
+	ret = regmap_read(data->regmap, BME680_H4_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H4_REG\n");
+		return ret;
+	}
+	calib->par_h4 = tmp;
+
+	ret = regmap_read(data->regmap, BME680_H5_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H5_REG\n");
+		return ret;
+	}
+	calib->par_h5 = tmp;
+
+	ret = regmap_read(data->regmap, BME680_H6_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H6_REG\n");
+		return ret;
+	}
+	calib->par_h6 = tmp;
+
+	ret = regmap_read(data->regmap, BME680_H7_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_H7_REG\n");
+		return ret;
+	}
+	calib->par_h7 = tmp;
+
+	/* Gas heater related coefficients */
+	ret = regmap_read(data->regmap, BME680_GH1_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_GH1_REG\n");
+		return ret;
+	}
+	calib->par_gh1 = tmp;
+
+	ret = regmap_bulk_read(data->regmap, BME680_GH2_LSB_REG,
+			       &buf, sizeof(buf));
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_GH2_LSB_REG\n");
+		return ret;
+	}
+	calib->par_gh2 = le16_to_cpu(buf);
+
+	ret = regmap_read(data->regmap, BME680_GH3_REG, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read BME680_GH3_REG\n");
+		return ret;
+	}
+	calib->par_gh3 = tmp;
+
+	/* Other coefficients */
+	ret = regmap_read(data->regmap, BME680_REG_RES_HEAT_RANGE, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read resistance heat range\n");
+		return ret;
+	}
+	calib->res_heat_range = FIELD_GET(BME680_RHRANGE_MASK, tmp);
+
+	ret = regmap_read(data->regmap, BME680_REG_RES_HEAT_VAL, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read resistance heat value\n");
+		return ret;
+	}
+	calib->res_heat_val = tmp;
+
+	ret = regmap_read(data->regmap, BME680_REG_RANGE_SW_ERR, &tmp);
+	if (ret < 0) {
+		dev_err(dev, "failed to read range software error\n");
+		return ret;
+	}
+	calib->range_sw_err = FIELD_GET(BME680_RSERROR_MASK, tmp);
+
+	return 0;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L876
+ *
+ * Returns temperature measurement in DegC, resolutions is 0.01 DegC. Therefore,
+ * output value of "3233" represents 32.33 DegC.
+ */
+static s16 bme680_compensate_temp(struct bme680_data *data,
+				  s32 adc_temp)
+{
+	struct bme680_calib *calib = &data->bme680;
+	s64 var1, var2, var3;
+	s16 calc_temp;
+
+	/* If the calibration is invalid, attempt to reload it */
+	if (!calib->par_t2)
+		bme680_read_calib(data, calib);
+
+	var1 = (adc_temp >> 3) - (calib->par_t1 << 1);
+	var2 = (var1 * calib->par_t2) >> 11;
+	var3 = ((var1 >> 1) * (var1 >> 1)) >> 12;
+	var3 = (var3 * (calib->par_t3 << 4)) >> 14;
+	data->t_fine = var2 + var3;
+	calc_temp = (data->t_fine * 5 + 128) >> 8;
+
+	return calc_temp;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L896
+ *
+ * Returns pressure measurement in Pa. Output value of "97356" represents
+ * 97356 Pa = 973.56 hPa.
+ */
+static u32 bme680_compensate_press(struct bme680_data *data,
+				   u32 adc_press)
+{
+	struct bme680_calib *calib = &data->bme680;
+	s32 var1, var2, var3, press_comp;
+
+	var1 = (data->t_fine >> 1) - 64000;
+	var2 = ((((var1 >> 2) * (var1 >> 2)) >> 11) * calib->par_p6) >> 2;
+	var2 = var2 + (var1 * calib->par_p5 << 1);
+	var2 = (var2 >> 2) + (calib->par_p4 << 16);
+	var1 = (((((var1 >> 2) * (var1 >> 2)) >> 13) *
+			(calib->par_p3 << 5)) >> 3) +
+			((calib->par_p2 * var1) >> 1);
+	var1 = var1 >> 18;
+	var1 = ((32768 + var1) * calib->par_p1) >> 15;
+	press_comp = 1048576 - adc_press;
+	press_comp = ((press_comp - (var2 >> 12)) * 3125);
+
+	if (press_comp >= BME680_MAX_OVERFLOW_VAL)
+		press_comp = ((press_comp / (u32)var1) << 1);
+	else
+		press_comp = ((press_comp << 1) / (u32)var1);
+
+	var1 = (calib->par_p9 * (((press_comp >> 3) *
+			(press_comp >> 3)) >> 13)) >> 12;
+	var2 = ((press_comp >> 2) * calib->par_p8) >> 13;
+	var3 = ((press_comp >> 8) * (press_comp >> 8) *
+			(press_comp >> 8) * calib->par_p10) >> 17;
+
+	press_comp += (var1 + var2 + var3 + (calib->par_p7 << 7)) >> 4;
+
+	return press_comp;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L937
+ *
+ * Returns humidity measurement in percent, resolution is 0.001 percent. Output
+ * value of "43215" represents 43.215 %rH.
+ */
+static u32 bme680_compensate_humid(struct bme680_data *data,
+				   u16 adc_humid)
+{
+	struct bme680_calib *calib = &data->bme680;
+	s32 var1, var2, var3, var4, var5, var6, temp_scaled, calc_hum;
+
+	temp_scaled = (data->t_fine * 5 + 128) >> 8;
+	var1 = (adc_humid - ((s32) ((s32) calib->par_h1 * 16))) -
+		(((temp_scaled * (s32) calib->par_h3) / 100) >> 1);
+	var2 = ((s32) calib->par_h2 *
+		(((temp_scaled * calib->par_h4) / 100) +
+		 (((temp_scaled * ((temp_scaled * calib->par_h5) / 100))
+		   >> 6) / 100) + (1 << 14))) >> 10;
+	var3 = var1 * var2;
+	var4 = calib->par_h6 << 7;
+	var4 = (var4 + ((temp_scaled * calib->par_h7) / 100)) >> 4;
+	var5 = ((var3 >> 14) * (var3 >> 14)) >> 10;
+	var6 = (var4 * var5) >> 1;
+	calc_hum = (((var3 + var6) >> 10) * 1000) >> 12;
+
+	calc_hum = clamp(calc_hum, 0, 100000); /* clamp between 0-100 %rH */
+
+	return calc_hum;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L973
+ *
+ * Returns gas measurement in Ohm. Output value of "82986" represent 82986 ohms.
+ */
+static u32 bme680_compensate_gas(struct bme680_data *data, u16 gas_res_adc,
+				 u8 gas_range)
+{
+	struct bme680_calib *calib = &data->bme680;
+	s64 var1;
+	u64 var2;
+	s64 var3;
+	u32 calc_gas_res;
+
+	/* Look up table for the possible gas range values */
+	const u32 lookupTable[16] = {2147483647u, 2147483647u,
+				2147483647u, 2147483647u, 2147483647u,
+				2126008810u, 2147483647u, 2130303777u,
+				2147483647u, 2147483647u, 2143188679u,
+				2136746228u, 2147483647u, 2126008810u,
+				2147483647u, 2147483647u};
+
+	var1 = ((1340 + (5 * (s64) calib->range_sw_err)) *
+			((s64) lookupTable[gas_range])) >> 16;
+	var2 = ((gas_res_adc << 15) - 16777216) + var1;
+	var3 = ((125000 << (15 - gas_range)) * var1) >> 9;
+	var3 += (var2 >> 1);
+	calc_gas_res = div64_s64(var3, (s64) var2);
+
+	return calc_gas_res;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L1002
+ */
+static u8 bme680_calc_heater_res(struct bme680_data *data, u16 temp)
+{
+	struct bme680_calib *calib = &data->bme680;
+	s32 var1, var2, var3, var4, var5, heatr_res_x100;
+	u8 heatr_res;
+
+	if (temp > 400) /* Cap temperature */
+		temp = 400;
+
+	var1 = (((s32) BME680_AMB_TEMP * calib->par_gh3) / 1000) * 256;
+	var2 = (calib->par_gh1 + 784) * (((((calib->par_gh2 + 154009) *
+						temp * 5) / 100)
+						+ 3276800) / 10);
+	var3 = var1 + (var2 / 2);
+	var4 = (var3 / (calib->res_heat_range + 4));
+	var5 = 131 * calib->res_heat_val + 65536;
+	heatr_res_x100 = ((var4 / var5) - 250) * 34;
+	heatr_res = DIV_ROUND_CLOSEST(heatr_res_x100, 100);
+
+	return heatr_res;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L1188
+ */
+static u8 bme680_calc_heater_dur(u16 dur)
+{
+	u8 durval, factor = 0;
+
+	if (dur >= 0xfc0) {
+		durval = 0xff; /* Max duration */
+	} else {
+		while (dur > 0x3F) {
+			dur = dur / 4;
+			factor += 1;
+		}
+		durval = dur + (factor * 64);
+	}
+
+	return durval;
+}
+
+static int bme680_set_mode(struct bme680_data *data, bool mode)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+
+	if (mode) {
+		ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
+					BME680_MODE_MASK, BME680_MODE_FORCED);
+		if (ret < 0)
+			dev_err(dev, "failed to set forced mode\n");
+
+	} else {
+		ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
+					BME680_MODE_MASK, BME680_MODE_SLEEP);
+		if (ret < 0)
+			dev_err(dev, "failed to set sleep mode\n");
+
+	}
+
+	return ret;
+}
+
+static u8 bme680_oversampling_to_reg(u8 val)
+{
+	return ilog2(val) + 1;
+}
+
+static int bme680_chip_config(struct bme680_data *data)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+	u8 osrs;
+
+	osrs = FIELD_PREP(
+		BME680_OSRS_HUMIDITY_MASK,
+		bme680_oversampling_to_reg(data->oversampling_humid));
+	/*
+	 * Highly recommended to set oversampling of humidity before
+	 * temperature/pressure oversampling.
+	 */
+	ret = regmap_update_bits(data->regmap, BME680_REG_CTRL_HUMIDITY,
+				 BME680_OSRS_HUMIDITY_MASK, osrs);
+	if (ret < 0) {
+		dev_err(dev, "failed to write ctrl_hum register\n");
+		return ret;
+	}
+
+	/* IIR filter settings */
+	ret = regmap_update_bits(data->regmap, BME680_REG_CONFIG,
+				 BME680_FILTER_MASK,
+				 BME680_FILTER_COEFF_VAL);
+	if (ret < 0) {
+		dev_err(dev, "failed to write config register\n");
+		return ret;
+	}
+
+	osrs = FIELD_PREP(BME680_OSRS_TEMP_MASK,
+			  bme680_oversampling_to_reg(data->oversampling_temp)) |
+	       FIELD_PREP(BME680_OSRS_PRESS_MASK,
+			  bme680_oversampling_to_reg(data->oversampling_press));
+	ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
+				BME680_OSRS_TEMP_MASK | BME680_OSRS_PRESS_MASK,
+				osrs);
+	if (ret < 0)
+		dev_err(dev, "failed to write ctrl_meas register\n");
+
+	return ret;
+}
+
+static int bme680_gas_config(struct bme680_data *data)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+	u8 heatr_res, heatr_dur;
+
+	heatr_res = bme680_calc_heater_res(data, data->heater_temp);
+
+	/* set target heater temperature */
+	ret = regmap_write(data->regmap, BME680_REG_RES_HEAT_0, heatr_res);
+	if (ret < 0) {
+		dev_err(dev, "failed to write res_heat_0 register\n");
+		return ret;
+	}
+
+	heatr_dur = bme680_calc_heater_dur(data->heater_dur);
+
+	/* set target heating duration */
+	ret = regmap_write(data->regmap, BME680_REG_GAS_WAIT_0, heatr_dur);
+	if (ret < 0) {
+		dev_err(dev, "failed to write gas_wait_0 register\n");
+		return ret;
+	}
+
+	/* Enable the gas sensor and select heater profile set-point 0 */
+	ret = regmap_update_bits(data->regmap, BME680_REG_CTRL_GAS_1,
+				 BME680_RUN_GAS_MASK | BME680_NB_CONV_MASK,
+				 FIELD_PREP(BME680_RUN_GAS_MASK, 1) |
+				 FIELD_PREP(BME680_NB_CONV_MASK, 0));
+	if (ret < 0)
+		dev_err(dev, "failed to write ctrl_gas_1 register\n");
+
+	return ret;
+}
+
+static int bme680_read_temp(struct bme680_data *data, int *val)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+	__be32 tmp = 0;
+	s32 adc_temp;
+	s16 comp_temp;
+
+	/* set forced mode to trigger measurement */
+	ret = bme680_set_mode(data, true);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_bulk_read(data->regmap, BME680_REG_TEMP_MSB,
+			       &tmp, 3);
+	if (ret < 0) {
+		dev_err(dev, "failed to read temperature\n");
+		return ret;
+	}
+
+	adc_temp = be32_to_cpu(tmp) >> 12;
+	if (adc_temp == BME680_MEAS_SKIPPED) {
+		/* reading was skipped */
+		dev_err(dev, "reading temperature skipped\n");
+		return -EINVAL;
+	}
+	comp_temp = bme680_compensate_temp(data, adc_temp);
+	/*
+	 * val might be NULL if we're called by the read_press/read_humid
+	 * routine which is called to get t_fine value used in
+	 * compensate_press/compensate_humid to get compensated
+	 * pressure/humidity readings.
+	 */
+	if (val) {
+		*val = comp_temp * 10; /* Centidegrees to millidegrees */
+		return IIO_VAL_INT;
+	}
+
+	return ret;
+}
+
+static int bme680_read_press(struct bme680_data *data,
+			     int *val, int *val2)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+	__be32 tmp = 0;
+	s32 adc_press;
+
+	/* Read and compensate temperature to get a reading of t_fine */
+	ret = bme680_read_temp(data, NULL);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_bulk_read(data->regmap, BME680_REG_PRESS_MSB,
+			       &tmp, 3);
+	if (ret < 0) {
+		dev_err(dev, "failed to read pressure\n");
+		return ret;
+	}
+
+	adc_press = be32_to_cpu(tmp) >> 12;
+	if (adc_press == BME680_MEAS_SKIPPED) {
+		/* reading was skipped */
+		dev_err(dev, "reading pressure skipped\n");
+		return -EINVAL;
+	}
+
+	*val = bme680_compensate_press(data, adc_press);
+	*val2 = 100;
+	return IIO_VAL_FRACTIONAL;
+}
+
+static int bme680_read_humid(struct bme680_data *data,
+			     int *val, int *val2)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+	__be16 tmp = 0;
+	s32 adc_humidity;
+	u32 comp_humidity;
+
+	/* Read and compensate temperature to get a reading of t_fine */
+	ret = bme680_read_temp(data, NULL);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_bulk_read(data->regmap, BM6880_REG_HUMIDITY_MSB,
+			       &tmp, sizeof(tmp));
+	if (ret < 0) {
+		dev_err(dev, "failed to read humidity\n");
+		return ret;
+	}
+
+	adc_humidity = be16_to_cpu(tmp);
+	if (adc_humidity == BME680_MEAS_SKIPPED) {
+		/* reading was skipped */
+		dev_err(dev, "reading humidity skipped\n");
+		return -EINVAL;
+	}
+	comp_humidity = bme680_compensate_humid(data, adc_humidity);
+
+	*val = comp_humidity;
+	*val2 = 1000;
+	return IIO_VAL_FRACTIONAL;
+}
+
+static int bme680_read_gas(struct bme680_data *data,
+			   int *val)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+	__be16 tmp = 0;
+	unsigned int check;
+	u16 adc_gas_res;
+	u8 gas_range;
+
+	/* Set heater settings */
+	ret = bme680_gas_config(data);
+	if (ret < 0) {
+		dev_err(dev, "failed to set gas config\n");
+		return ret;
+	}
+
+	/* set forced mode to trigger measurement */
+	ret = bme680_set_mode(data, true);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &check);
+	if (check & BME680_GAS_MEAS_BIT) {
+		dev_err(dev, "gas measurement incomplete\n");
+		return -EBUSY;
+	}
+
+	ret = regmap_read(data->regmap, BME680_REG_GAS_R_LSB, &check);
+	if (ret < 0) {
+		dev_err(dev, "failed to read gas_r_lsb register\n");
+		return ret;
+	}
+
+	/*
+	 * occurs if either the gas heating duration was insuffient
+	 * to reach the target heater temperature or the target
+	 * heater temperature was too high for the heater sink to
+	 * reach.
+	 */
+	if ((check & BME680_GAS_STAB_BIT) == 0) {
+		dev_err(dev, "heater failed to reach the target temperature\n");
+		return -EINVAL;
+	}
+
+	ret = regmap_bulk_read(data->regmap, BME680_REG_GAS_MSB,
+			       &tmp, sizeof(tmp));
+	if (ret < 0) {
+		dev_err(dev, "failed to read gas resistance\n");
+		return ret;
+	}
+
+	gas_range = check & BME680_GAS_RANGE_MASK;
+	adc_gas_res = be16_to_cpu(tmp) >> BME680_ADC_GAS_RES_SHIFT;
+
+	*val = bme680_compensate_gas(data, adc_gas_res, gas_range);
+	return IIO_VAL_INT;
+}
+
+static int bme680_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long mask)
+{
+	struct bme680_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (chan->type) {
+		case IIO_TEMP:
+			return bme680_read_temp(data, val);
+		case IIO_PRESSURE:
+			return bme680_read_press(data, val, val2);
+		case IIO_HUMIDITYRELATIVE:
+			return bme680_read_humid(data, val, val2);
+		case IIO_RESISTANCE:
+			return bme680_read_gas(data, val);
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		switch (chan->type) {
+		case IIO_TEMP:
+			*val = data->oversampling_temp;
+			return IIO_VAL_INT;
+		case IIO_PRESSURE:
+			*val = data->oversampling_press;
+			return IIO_VAL_INT;
+		case IIO_HUMIDITYRELATIVE:
+			*val = data->oversampling_humid;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static bool bme680_is_valid_oversampling(int rate)
+{
+	return (rate > 0 && rate <= 16 && is_power_of_2(rate));
+}
+
+static int bme680_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long mask)
+{
+	struct bme680_data *data = iio_priv(indio_dev);
+
+	if (val2 != 0)
+		return -EINVAL;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+	{
+		if (!bme680_is_valid_oversampling(val))
+			return -EINVAL;
+
+		switch (chan->type) {
+		case IIO_TEMP:
+			data->oversampling_temp = val;
+			break;
+		case IIO_PRESSURE:
+			data->oversampling_press = val;
+			break;
+		case IIO_HUMIDITYRELATIVE:
+			data->oversampling_humid = val;
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		return bme680_chip_config(data);
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
+static const char bme680_oversampling_ratio_show[] = "1 2 4 8 16";
+
+static IIO_CONST_ATTR(oversampling_ratio_available,
+		      bme680_oversampling_ratio_show);
+
+static struct attribute *bme680_attributes[] = {
+	&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group bme680_attribute_group = {
+	.attrs = bme680_attributes,
+};
+
+static const struct iio_info bme680_info = {
+	.read_raw = &bme680_read_raw,
+	.write_raw = &bme680_write_raw,
+	.attrs = &bme680_attribute_group,
+};
+
+static const char *bme680_match_acpi_device(struct device *dev)
+{
+	const struct acpi_device_id *id;
+
+	id = acpi_match_device(dev->driver->acpi_match_table, dev);
+	if (!id)
+		return NULL;
+
+	return dev_name(dev);
+}
+
+int bme680_core_probe(struct device *dev, struct regmap *regmap,
+		      const char *name)
+{
+	struct iio_dev *indio_dev;
+	struct bme680_data *data;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_write(regmap, BME680_REG_SOFT_RESET,
+			   BME680_CMD_SOFTRESET);
+	if (ret < 0) {
+		dev_err(dev, "Failed to reset chip\n");
+		return ret;
+	}
+
+	ret = regmap_read(regmap, BME680_REG_CHIP_ID, &val);
+	if (ret < 0) {
+		dev_err(dev, "Error reading chip ID\n");
+		return ret;
+	}
+
+	if (val != BME680_CHIP_ID_VAL) {
+		dev_err(dev, "Wrong chip ID, got %x expected %x\n",
+				val, BME680_CHIP_ID_VAL);
+		return -ENODEV;
+	}
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	if (!name && ACPI_HANDLE(dev))
+		name = bme680_match_acpi_device(dev);
+
+	data = iio_priv(indio_dev);
+	dev_set_drvdata(dev, indio_dev);
+	data->regmap = regmap;
+	indio_dev->name = name;
+	indio_dev->channels = bme680_channels;
+	indio_dev->num_channels = ARRAY_SIZE(bme680_channels);
+	indio_dev->info = &bme680_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	/* default values for the sensor */
+	data->oversampling_humid = 2; /* 2X oversampling rate */
+	data->oversampling_press = 4; /* 4X oversampling rate */
+	data->oversampling_temp = 8;  /* 8X oversampling rate */
+	data->heater_temp = 320; /* degree Celsius */
+	data->heater_dur = 150;  /* milliseconds */
+
+	ret = bme680_chip_config(data);
+	if (ret < 0) {
+		dev_err(dev, "failed to set chip_config data\n");
+		return ret;
+	}
+
+	ret = bme680_gas_config(data);
+	if (ret < 0) {
+		dev_err(dev, "failed to set gas config data\n");
+		return ret;
+	}
+
+	ret = bme680_read_calib(data, &data->bme680);
+	if (ret < 0) {
+		dev_err(dev,
+			"failed to read calibration coefficients at probe\n");
+		return ret;
+	}
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL_NS_GPL(bme680_core_probe, IIO_BME680);
+
+MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>");
+MODULE_DESCRIPTION("Bosch BME680 Driver");
+MODULE_LICENSE("GPL v2");