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, 1653 insertions, 0 deletions

diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
new file mode 100644
index 000000000..bdbd91821
--- /dev/null
+++ b/drivers/iio/light/ltr501.c
@@ -0,0 +1,1653 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Support for Lite-On LTR501 and similar ambient light and proximity sensors.
+ *
+ * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
+ *
+ * 7-bit I2C slave address 0x23
+ *
+ * TODO: IR LED characteristics
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+#include <linux/acpi.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/events.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define LTR501_DRV_NAME "ltr501"
+
+#define LTR501_ALS_CONTR 0x80 /* ALS operation mode, SW reset */
+#define LTR501_PS_CONTR 0x81 /* PS operation mode */
+#define LTR501_PS_MEAS_RATE 0x84 /* measurement rate*/
+#define LTR501_ALS_MEAS_RATE 0x85 /* ALS integ time, measurement rate*/
+#define LTR501_PART_ID 0x86
+#define LTR501_MANUFAC_ID 0x87
+#define LTR501_ALS_DATA1 0x88 /* 16-bit, little endian */
+#define LTR501_ALS_DATA1_UPPER 0x89 /* upper 8 bits of LTR501_ALS_DATA1 */
+#define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */
+#define LTR501_ALS_DATA0_UPPER 0x8b /* upper 8 bits of LTR501_ALS_DATA0 */
+#define LTR501_ALS_PS_STATUS 0x8c
+#define LTR501_PS_DATA 0x8d /* 16-bit, little endian */
+#define LTR501_PS_DATA_UPPER 0x8e /* upper 8 bits of LTR501_PS_DATA */
+#define LTR501_INTR 0x8f /* output mode, polarity, mode */
+#define LTR501_PS_THRESH_UP 0x90 /* 11 bit, ps upper threshold */
+#define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */
+#define LTR501_ALS_THRESH_UP 0x97 /* 16 bit, ALS upper threshold */
+#define LTR501_ALS_THRESH_LOW 0x99 /* 16 bit, ALS lower threshold */
+#define LTR501_INTR_PRST 0x9e /* ps thresh, als thresh */
+#define LTR501_MAX_REG 0x9f
+
+#define LTR501_ALS_CONTR_SW_RESET BIT(2)
+#define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2))
+#define LTR501_CONTR_PS_GAIN_SHIFT 2
+#define LTR501_CONTR_ALS_GAIN_MASK BIT(3)
+#define LTR501_CONTR_ACTIVE BIT(1)
+
+#define LTR501_STATUS_ALS_INTR BIT(3)
+#define LTR501_STATUS_ALS_RDY BIT(2)
+#define LTR501_STATUS_PS_INTR BIT(1)
+#define LTR501_STATUS_PS_RDY BIT(0)
+
+#define LTR501_PS_DATA_MASK 0x7ff
+#define LTR501_PS_THRESH_MASK 0x7ff
+#define LTR501_ALS_THRESH_MASK 0xffff
+
+#define LTR501_ALS_DEF_PERIOD 500000
+#define LTR501_PS_DEF_PERIOD 100000
+
+#define LTR501_REGMAP_NAME "ltr501_regmap"
+
+#define LTR501_LUX_CONV(vis_coeff, vis_data, ir_coeff, ir_data) \
+			((vis_coeff * vis_data) - (ir_coeff * ir_data))
+
+static const int int_time_mapping[] = {100000, 50000, 200000, 400000};
+
+static const struct reg_field reg_field_it =
+				REG_FIELD(LTR501_ALS_MEAS_RATE, 3, 4);
+static const struct reg_field reg_field_als_intr =
+				REG_FIELD(LTR501_INTR, 1, 1);
+static const struct reg_field reg_field_ps_intr =
+				REG_FIELD(LTR501_INTR, 0, 0);
+static const struct reg_field reg_field_als_rate =
+				REG_FIELD(LTR501_ALS_MEAS_RATE, 0, 2);
+static const struct reg_field reg_field_ps_rate =
+				REG_FIELD(LTR501_PS_MEAS_RATE, 0, 3);
+static const struct reg_field reg_field_als_prst =
+				REG_FIELD(LTR501_INTR_PRST, 0, 3);
+static const struct reg_field reg_field_ps_prst =
+				REG_FIELD(LTR501_INTR_PRST, 4, 7);
+
+struct ltr501_samp_table {
+	int freq_val;  /* repetition frequency in micro HZ*/
+	int time_val; /* repetition rate in micro seconds */
+};
+
+#define LTR501_RESERVED_GAIN -1
+
+enum {
+	ltr501 = 0,
+	ltr559,
+	ltr301,
+	ltr303,
+};
+
+struct ltr501_gain {
+	int scale;
+	int uscale;
+};
+
+static const struct ltr501_gain ltr501_als_gain_tbl[] = {
+	{1, 0},
+	{0, 5000},
+};
+
+static const struct ltr501_gain ltr559_als_gain_tbl[] = {
+	{1, 0},
+	{0, 500000},
+	{0, 250000},
+	{0, 125000},
+	{LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
+	{LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
+	{0, 20000},
+	{0, 10000},
+};
+
+static const struct ltr501_gain ltr501_ps_gain_tbl[] = {
+	{1, 0},
+	{0, 250000},
+	{0, 125000},
+	{0, 62500},
+};
+
+static const struct ltr501_gain ltr559_ps_gain_tbl[] = {
+	{0, 62500}, /* x16 gain */
+	{0, 31250}, /* x32 gain */
+	{0, 15625}, /* bits X1 are for x64 gain */
+	{0, 15624},
+};
+
+struct ltr501_chip_info {
+	u8 partid;
+	const struct ltr501_gain *als_gain;
+	int als_gain_tbl_size;
+	const struct ltr501_gain *ps_gain;
+	int ps_gain_tbl_size;
+	u8 als_mode_active;
+	u8 als_gain_mask;
+	u8 als_gain_shift;
+	struct iio_chan_spec const *channels;
+	const int no_channels;
+	const struct iio_info *info;
+	const struct iio_info *info_no_irq;
+};
+
+struct ltr501_data {
+	struct i2c_client *client;
+	struct mutex lock_als, lock_ps;
+	const struct ltr501_chip_info *chip_info;
+	u8 als_contr, ps_contr;
+	int als_period, ps_period; /* period in micro seconds */
+	struct regmap *regmap;
+	struct regmap_field *reg_it;
+	struct regmap_field *reg_als_intr;
+	struct regmap_field *reg_ps_intr;
+	struct regmap_field *reg_als_rate;
+	struct regmap_field *reg_ps_rate;
+	struct regmap_field *reg_als_prst;
+	struct regmap_field *reg_ps_prst;
+	uint32_t near_level;
+};
+
+static const struct ltr501_samp_table ltr501_als_samp_table[] = {
+			{20000000, 50000}, {10000000, 100000},
+			{5000000, 200000}, {2000000, 500000},
+			{1000000, 1000000}, {500000, 2000000},
+			{500000, 2000000}, {500000, 2000000}
+};
+
+static const struct ltr501_samp_table ltr501_ps_samp_table[] = {
+			{20000000, 50000}, {14285714, 70000},
+			{10000000, 100000}, {5000000, 200000},
+			{2000000, 500000}, {1000000, 1000000},
+			{500000, 2000000}, {500000, 2000000},
+			{500000, 2000000}
+};
+
+static int ltr501_match_samp_freq(const struct ltr501_samp_table *tab,
+					   int len, int val, int val2)
+{
+	int i, freq;
+
+	freq = val * 1000000 + val2;
+
+	for (i = 0; i < len; i++) {
+		if (tab[i].freq_val == freq)
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+static int ltr501_als_read_samp_freq(const struct ltr501_data *data,
+				     int *val, int *val2)
+{
+	int ret, i;
+
+	ret = regmap_field_read(data->reg_als_rate, &i);
+	if (ret < 0)
+		return ret;
+
+	if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
+		return -EINVAL;
+
+	*val = ltr501_als_samp_table[i].freq_val / 1000000;
+	*val2 = ltr501_als_samp_table[i].freq_val % 1000000;
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int ltr501_ps_read_samp_freq(const struct ltr501_data *data,
+				    int *val, int *val2)
+{
+	int ret, i;
+
+	ret = regmap_field_read(data->reg_ps_rate, &i);
+	if (ret < 0)
+		return ret;
+
+	if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
+		return -EINVAL;
+
+	*val = ltr501_ps_samp_table[i].freq_val / 1000000;
+	*val2 = ltr501_ps_samp_table[i].freq_val % 1000000;
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int ltr501_als_write_samp_freq(struct ltr501_data *data,
+				      int val, int val2)
+{
+	int i, ret;
+
+	i = ltr501_match_samp_freq(ltr501_als_samp_table,
+				   ARRAY_SIZE(ltr501_als_samp_table),
+				   val, val2);
+
+	if (i < 0)
+		return i;
+
+	mutex_lock(&data->lock_als);
+	ret = regmap_field_write(data->reg_als_rate, i);
+	mutex_unlock(&data->lock_als);
+
+	return ret;
+}
+
+static int ltr501_ps_write_samp_freq(struct ltr501_data *data,
+				     int val, int val2)
+{
+	int i, ret;
+
+	i = ltr501_match_samp_freq(ltr501_ps_samp_table,
+				   ARRAY_SIZE(ltr501_ps_samp_table),
+				   val, val2);
+
+	if (i < 0)
+		return i;
+
+	mutex_lock(&data->lock_ps);
+	ret = regmap_field_write(data->reg_ps_rate, i);
+	mutex_unlock(&data->lock_ps);
+
+	return ret;
+}
+
+static int ltr501_als_read_samp_period(const struct ltr501_data *data, int *val)
+{
+	int ret, i;
+
+	ret = regmap_field_read(data->reg_als_rate, &i);
+	if (ret < 0)
+		return ret;
+
+	if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
+		return -EINVAL;
+
+	*val = ltr501_als_samp_table[i].time_val;
+
+	return IIO_VAL_INT;
+}
+
+static int ltr501_ps_read_samp_period(const struct ltr501_data *data, int *val)
+{
+	int ret, i;
+
+	ret = regmap_field_read(data->reg_ps_rate, &i);
+	if (ret < 0)
+		return ret;
+
+	if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
+		return -EINVAL;
+
+	*val = ltr501_ps_samp_table[i].time_val;
+
+	return IIO_VAL_INT;
+}
+
+/* IR and visible spectrum coeff's are given in data sheet */
+static unsigned long ltr501_calculate_lux(u16 vis_data, u16 ir_data)
+{
+	unsigned long ratio, lux;
+
+	if (vis_data == 0)
+		return 0;
+
+	/* multiply numerator by 100 to avoid handling ratio < 1 */
+	ratio = DIV_ROUND_UP(ir_data * 100, ir_data + vis_data);
+
+	if (ratio < 45)
+		lux = LTR501_LUX_CONV(1774, vis_data, -1105, ir_data);
+	else if (ratio >= 45 && ratio < 64)
+		lux = LTR501_LUX_CONV(3772, vis_data, 1336, ir_data);
+	else if (ratio >= 64 && ratio < 85)
+		lux = LTR501_LUX_CONV(1690, vis_data, 169, ir_data);
+	else
+		lux = 0;
+
+	return lux / 1000;
+}
+
+static int ltr501_drdy(const struct ltr501_data *data, u8 drdy_mask)
+{
+	int tries = 100;
+	int ret, status;
+
+	while (tries--) {
+		ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
+		if (ret < 0)
+			return ret;
+		if ((status & drdy_mask) == drdy_mask)
+			return 0;
+		msleep(25);
+	}
+
+	dev_err(&data->client->dev, "ltr501_drdy() failed, data not ready\n");
+	return -EIO;
+}
+
+static int ltr501_set_it_time(struct ltr501_data *data, int it)
+{
+	int ret, i, index = -1, status;
+
+	for (i = 0; i < ARRAY_SIZE(int_time_mapping); i++) {
+		if (int_time_mapping[i] == it) {
+			index = i;
+			break;
+		}
+	}
+	/* Make sure integ time index is valid */
+	if (index < 0)
+		return -EINVAL;
+
+	ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
+	if (ret < 0)
+		return ret;
+
+	if (status & LTR501_CONTR_ALS_GAIN_MASK) {
+		/*
+		 * 200 ms and 400 ms integ time can only be
+		 * used in dynamic range 1
+		 */
+		if (index > 1)
+			return -EINVAL;
+	} else
+		/* 50 ms integ time can only be used in dynamic range 2 */
+		if (index == 1)
+			return -EINVAL;
+
+	return regmap_field_write(data->reg_it, index);
+}
+
+/* read int time in micro seconds */
+static int ltr501_read_it_time(const struct ltr501_data *data,
+			       int *val, int *val2)
+{
+	int ret, index;
+
+	ret = regmap_field_read(data->reg_it, &index);
+	if (ret < 0)
+		return ret;
+
+	/* Make sure integ time index is valid */
+	if (index < 0 || index >= ARRAY_SIZE(int_time_mapping))
+		return -EINVAL;
+
+	*val2 = int_time_mapping[index];
+	*val = 0;
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int ltr501_read_als(const struct ltr501_data *data, __le16 buf[2])
+{
+	int ret;
+
+	ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY);
+	if (ret < 0)
+		return ret;
+	/* always read both ALS channels in given order */
+	return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
+				buf, 2 * sizeof(__le16));
+}
+
+static int ltr501_read_ps(const struct ltr501_data *data)
+{
+	__le16 status;
+	int ret;
+
+	ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
+			       &status, sizeof(status));
+	if (ret < 0)
+		return ret;
+
+	return le16_to_cpu(status);
+}
+
+static int ltr501_read_intr_prst(const struct ltr501_data *data,
+				 enum iio_chan_type type,
+				 int *val2)
+{
+	int ret, samp_period, prst;
+
+	switch (type) {
+	case IIO_INTENSITY:
+		ret = regmap_field_read(data->reg_als_prst, &prst);
+		if (ret < 0)
+			return ret;
+
+		ret = ltr501_als_read_samp_period(data, &samp_period);
+
+		if (ret < 0)
+			return ret;
+		*val2 = samp_period * prst;
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_PROXIMITY:
+		ret = regmap_field_read(data->reg_ps_prst, &prst);
+		if (ret < 0)
+			return ret;
+
+		ret = ltr501_ps_read_samp_period(data, &samp_period);
+
+		if (ret < 0)
+			return ret;
+
+		*val2 = samp_period * prst;
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static int ltr501_write_intr_prst(struct ltr501_data *data,
+				  enum iio_chan_type type,
+				  int val, int val2)
+{
+	int ret, samp_period, new_val;
+	unsigned long period;
+
+	if (val < 0 || val2 < 0)
+		return -EINVAL;
+
+	/* period in microseconds */
+	period = ((val * 1000000) + val2);
+
+	switch (type) {
+	case IIO_INTENSITY:
+		ret = ltr501_als_read_samp_period(data, &samp_period);
+		if (ret < 0)
+			return ret;
+
+		/* period should be atleast equal to sampling period */
+		if (period < samp_period)
+			return -EINVAL;
+
+		new_val = DIV_ROUND_UP(period, samp_period);
+		if (new_val < 0 || new_val > 0x0f)
+			return -EINVAL;
+
+		mutex_lock(&data->lock_als);
+		ret = regmap_field_write(data->reg_als_prst, new_val);
+		mutex_unlock(&data->lock_als);
+		if (ret >= 0)
+			data->als_period = period;
+
+		return ret;
+	case IIO_PROXIMITY:
+		ret = ltr501_ps_read_samp_period(data, &samp_period);
+		if (ret < 0)
+			return ret;
+
+		/* period should be atleast equal to rate */
+		if (period < samp_period)
+			return -EINVAL;
+
+		new_val = DIV_ROUND_UP(period, samp_period);
+		if (new_val < 0 || new_val > 0x0f)
+			return -EINVAL;
+
+		mutex_lock(&data->lock_ps);
+		ret = regmap_field_write(data->reg_ps_prst, new_val);
+		mutex_unlock(&data->lock_ps);
+		if (ret >= 0)
+			data->ps_period = period;
+
+		return ret;
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t ltr501_read_near_level(struct iio_dev *indio_dev,
+				      uintptr_t priv,
+				      const struct iio_chan_spec *chan,
+				      char *buf)
+{
+	struct ltr501_data *data = iio_priv(indio_dev);
+
+	return sprintf(buf, "%u\n", data->near_level);
+}
+
+static const struct iio_chan_spec_ext_info ltr501_ext_info[] = {
+	{
+		.name = "nearlevel",
+		.shared = IIO_SEPARATE,
+		.read = ltr501_read_near_level,
+	},
+	{ /* sentinel */ }
+};
+
+static const struct iio_event_spec ltr501_als_event_spec[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE),
+	}, {
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE),
+	}, {
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_EITHER,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
+				 BIT(IIO_EV_INFO_PERIOD),
+	},
+
+};
+
+static const struct iio_event_spec ltr501_pxs_event_spec[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE),
+	}, {
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE),
+	}, {
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_EITHER,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
+				 BIT(IIO_EV_INFO_PERIOD),
+	},
+};
+
+#define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared, \
+				 _evspec, _evsize) { \
+	.type = IIO_INTENSITY, \
+	.modified = 1, \
+	.address = (_addr), \
+	.channel2 = (_mod), \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = (_shared), \
+	.scan_index = (_idx), \
+	.scan_type = { \
+		.sign = 'u', \
+		.realbits = 16, \
+		.storagebits = 16, \
+		.endianness = IIO_CPU, \
+	}, \
+	.event_spec = _evspec,\
+	.num_event_specs = _evsize,\
+}
+
+#define LTR501_LIGHT_CHANNEL() { \
+	.type = IIO_LIGHT, \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
+	.scan_index = -1, \
+}
+
+static const struct iio_chan_spec ltr501_channels[] = {
+	LTR501_LIGHT_CHANNEL(),
+	LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
+				 ltr501_als_event_spec,
+				 ARRAY_SIZE(ltr501_als_event_spec)),
+	LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
+				 BIT(IIO_CHAN_INFO_SCALE) |
+				 BIT(IIO_CHAN_INFO_INT_TIME) |
+				 BIT(IIO_CHAN_INFO_SAMP_FREQ),
+				 NULL, 0),
+	{
+		.type = IIO_PROXIMITY,
+		.address = LTR501_PS_DATA,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE),
+		.scan_index = 2,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 11,
+			.storagebits = 16,
+			.endianness = IIO_CPU,
+		},
+		.event_spec = ltr501_pxs_event_spec,
+		.num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec),
+		.ext_info = ltr501_ext_info,
+	},
+	IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+static const struct iio_chan_spec ltr301_channels[] = {
+	LTR501_LIGHT_CHANNEL(),
+	LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
+				 ltr501_als_event_spec,
+				 ARRAY_SIZE(ltr501_als_event_spec)),
+	LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
+				 BIT(IIO_CHAN_INFO_SCALE) |
+				 BIT(IIO_CHAN_INFO_INT_TIME) |
+				 BIT(IIO_CHAN_INFO_SAMP_FREQ),
+				 NULL, 0),
+	IIO_CHAN_SOFT_TIMESTAMP(2),
+};
+
+static int ltr501_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long mask)
+{
+	struct ltr501_data *data = iio_priv(indio_dev);
+	__le16 buf[2];
+	int ret, i;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (chan->type) {
+		case IIO_LIGHT:
+			ret = iio_device_claim_direct_mode(indio_dev);
+			if (ret)
+				return ret;
+
+			mutex_lock(&data->lock_als);
+			ret = ltr501_read_als(data, buf);
+			mutex_unlock(&data->lock_als);
+			iio_device_release_direct_mode(indio_dev);
+			if (ret < 0)
+				return ret;
+			*val = ltr501_calculate_lux(le16_to_cpu(buf[1]),
+						    le16_to_cpu(buf[0]));
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			mutex_lock(&data->lock_als);
+			ret = ltr501_read_als(data, buf);
+			mutex_unlock(&data->lock_als);
+			if (ret < 0)
+				break;
+			*val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ?
+					   buf[0] : buf[1]);
+			ret = IIO_VAL_INT;
+			break;
+		case IIO_PROXIMITY:
+			mutex_lock(&data->lock_ps);
+			ret = ltr501_read_ps(data);
+			mutex_unlock(&data->lock_ps);
+			if (ret < 0)
+				break;
+			*val = ret & LTR501_PS_DATA_MASK;
+			ret = IIO_VAL_INT;
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+
+		iio_device_release_direct_mode(indio_dev);
+		return ret;
+
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			i = (data->als_contr & data->chip_info->als_gain_mask)
+			     >> data->chip_info->als_gain_shift;
+			*val = data->chip_info->als_gain[i].scale;
+			*val2 = data->chip_info->als_gain[i].uscale;
+			return IIO_VAL_INT_PLUS_MICRO;
+		case IIO_PROXIMITY:
+			i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >>
+				LTR501_CONTR_PS_GAIN_SHIFT;
+			*val = data->chip_info->ps_gain[i].scale;
+			*val2 = data->chip_info->ps_gain[i].uscale;
+			return IIO_VAL_INT_PLUS_MICRO;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_INT_TIME:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			return ltr501_read_it_time(data, val, val2);
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			return ltr501_als_read_samp_freq(data, val, val2);
+		case IIO_PROXIMITY:
+			return ltr501_ps_read_samp_freq(data, val, val2);
+		default:
+			return -EINVAL;
+		}
+	}
+	return -EINVAL;
+}
+
+static int ltr501_get_gain_index(const struct ltr501_gain *gain, int size,
+				 int val, int val2)
+{
+	int i;
+
+	for (i = 0; i < size; i++)
+		if (val == gain[i].scale && val2 == gain[i].uscale)
+			return i;
+
+	return -1;
+}
+
+static int ltr501_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long mask)
+{
+	struct ltr501_data *data = iio_priv(indio_dev);
+	int i, ret, freq_val, freq_val2;
+	const struct ltr501_chip_info *info = data->chip_info;
+
+	ret = iio_device_claim_direct_mode(indio_dev);
+	if (ret)
+		return ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			i = ltr501_get_gain_index(info->als_gain,
+						  info->als_gain_tbl_size,
+						  val, val2);
+			if (i < 0) {
+				ret = -EINVAL;
+				break;
+			}
+
+			data->als_contr &= ~info->als_gain_mask;
+			data->als_contr |= i << info->als_gain_shift;
+
+			ret = regmap_write(data->regmap, LTR501_ALS_CONTR,
+					   data->als_contr);
+			break;
+		case IIO_PROXIMITY:
+			i = ltr501_get_gain_index(info->ps_gain,
+						  info->ps_gain_tbl_size,
+						  val, val2);
+			if (i < 0) {
+				ret = -EINVAL;
+				break;
+			}
+			data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
+			data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT;
+
+			ret = regmap_write(data->regmap, LTR501_PS_CONTR,
+					   data->ps_contr);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+
+	case IIO_CHAN_INFO_INT_TIME:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			if (val != 0) {
+				ret = -EINVAL;
+				break;
+			}
+			mutex_lock(&data->lock_als);
+			ret = ltr501_set_it_time(data, val2);
+			mutex_unlock(&data->lock_als);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			ret = ltr501_als_read_samp_freq(data, &freq_val,
+							&freq_val2);
+			if (ret < 0)
+				break;
+
+			ret = ltr501_als_write_samp_freq(data, val, val2);
+			if (ret < 0)
+				break;
+
+			/* update persistence count when changing frequency */
+			ret = ltr501_write_intr_prst(data, chan->type,
+						     0, data->als_period);
+
+			if (ret < 0)
+				ret = ltr501_als_write_samp_freq(data, freq_val,
+								 freq_val2);
+			break;
+		case IIO_PROXIMITY:
+			ret = ltr501_ps_read_samp_freq(data, &freq_val,
+						       &freq_val2);
+			if (ret < 0)
+				break;
+
+			ret = ltr501_ps_write_samp_freq(data, val, val2);
+			if (ret < 0)
+				break;
+
+			/* update persistence count when changing frequency */
+			ret = ltr501_write_intr_prst(data, chan->type,
+						     0, data->ps_period);
+
+			if (ret < 0)
+				ret = ltr501_ps_write_samp_freq(data, freq_val,
+								freq_val2);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	iio_device_release_direct_mode(indio_dev);
+	return ret;
+}
+
+static int ltr501_read_thresh(const struct iio_dev *indio_dev,
+			      const struct iio_chan_spec *chan,
+			      enum iio_event_type type,
+			      enum iio_event_direction dir,
+			      enum iio_event_info info,
+			      int *val, int *val2)
+{
+	const struct ltr501_data *data = iio_priv(indio_dev);
+	int ret, thresh_data;
+
+	switch (chan->type) {
+	case IIO_INTENSITY:
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			ret = regmap_bulk_read(data->regmap,
+					       LTR501_ALS_THRESH_UP,
+					       &thresh_data, 2);
+			if (ret < 0)
+				return ret;
+			*val = thresh_data & LTR501_ALS_THRESH_MASK;
+			return IIO_VAL_INT;
+		case IIO_EV_DIR_FALLING:
+			ret = regmap_bulk_read(data->regmap,
+					       LTR501_ALS_THRESH_LOW,
+					       &thresh_data, 2);
+			if (ret < 0)
+				return ret;
+			*val = thresh_data & LTR501_ALS_THRESH_MASK;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_PROXIMITY:
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			ret = regmap_bulk_read(data->regmap,
+					       LTR501_PS_THRESH_UP,
+					       &thresh_data, 2);
+			if (ret < 0)
+				return ret;
+			*val = thresh_data & LTR501_PS_THRESH_MASK;
+			return IIO_VAL_INT;
+		case IIO_EV_DIR_FALLING:
+			ret = regmap_bulk_read(data->regmap,
+					       LTR501_PS_THRESH_LOW,
+					       &thresh_data, 2);
+			if (ret < 0)
+				return ret;
+			*val = thresh_data & LTR501_PS_THRESH_MASK;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static int ltr501_write_thresh(struct iio_dev *indio_dev,
+			       const struct iio_chan_spec *chan,
+			       enum iio_event_type type,
+			       enum iio_event_direction dir,
+			       enum iio_event_info info,
+			       int val, int val2)
+{
+	struct ltr501_data *data = iio_priv(indio_dev);
+	int ret;
+
+	if (val < 0)
+		return -EINVAL;
+
+	switch (chan->type) {
+	case IIO_INTENSITY:
+		if (val > LTR501_ALS_THRESH_MASK)
+			return -EINVAL;
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			mutex_lock(&data->lock_als);
+			ret = regmap_bulk_write(data->regmap,
+						LTR501_ALS_THRESH_UP,
+						&val, 2);
+			mutex_unlock(&data->lock_als);
+			return ret;
+		case IIO_EV_DIR_FALLING:
+			mutex_lock(&data->lock_als);
+			ret = regmap_bulk_write(data->regmap,
+						LTR501_ALS_THRESH_LOW,
+						&val, 2);
+			mutex_unlock(&data->lock_als);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	case IIO_PROXIMITY:
+		if (val > LTR501_PS_THRESH_MASK)
+			return -EINVAL;
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			mutex_lock(&data->lock_ps);
+			ret = regmap_bulk_write(data->regmap,
+						LTR501_PS_THRESH_UP,
+						&val, 2);
+			mutex_unlock(&data->lock_ps);
+			return ret;
+		case IIO_EV_DIR_FALLING:
+			mutex_lock(&data->lock_ps);
+			ret = regmap_bulk_write(data->regmap,
+						LTR501_PS_THRESH_LOW,
+						&val, 2);
+			mutex_unlock(&data->lock_ps);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static int ltr501_read_event(struct iio_dev *indio_dev,
+			     const struct iio_chan_spec *chan,
+			     enum iio_event_type type,
+			     enum iio_event_direction dir,
+			     enum iio_event_info info,
+			     int *val, int *val2)
+{
+	int ret;
+
+	switch (info) {
+	case IIO_EV_INFO_VALUE:
+		return ltr501_read_thresh(indio_dev, chan, type, dir,
+					  info, val, val2);
+	case IIO_EV_INFO_PERIOD:
+		ret = ltr501_read_intr_prst(iio_priv(indio_dev),
+					    chan->type, val2);
+		*val = *val2 / 1000000;
+		*val2 = *val2 % 1000000;
+		return ret;
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static int ltr501_write_event(struct iio_dev *indio_dev,
+			      const struct iio_chan_spec *chan,
+			      enum iio_event_type type,
+			      enum iio_event_direction dir,
+			      enum iio_event_info info,
+			      int val, int val2)
+{
+	switch (info) {
+	case IIO_EV_INFO_VALUE:
+		if (val2 != 0)
+			return -EINVAL;
+		return ltr501_write_thresh(indio_dev, chan, type, dir,
+					   info, val, val2);
+	case IIO_EV_INFO_PERIOD:
+		return ltr501_write_intr_prst(iio_priv(indio_dev), chan->type,
+					      val, val2);
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static int ltr501_read_event_config(struct iio_dev *indio_dev,
+				    const struct iio_chan_spec *chan,
+				    enum iio_event_type type,
+				    enum iio_event_direction dir)
+{
+	struct ltr501_data *data = iio_priv(indio_dev);
+	int ret, status;
+
+	switch (chan->type) {
+	case IIO_INTENSITY:
+		ret = regmap_field_read(data->reg_als_intr, &status);
+		if (ret < 0)
+			return ret;
+		return status;
+	case IIO_PROXIMITY:
+		ret = regmap_field_read(data->reg_ps_intr, &status);
+		if (ret < 0)
+			return ret;
+		return status;
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static int ltr501_write_event_config(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir, int state)
+{
+	struct ltr501_data *data = iio_priv(indio_dev);
+	int ret;
+
+	/* only 1 and 0 are valid inputs */
+	if (state != 1  && state != 0)
+		return -EINVAL;
+
+	switch (chan->type) {
+	case IIO_INTENSITY:
+		mutex_lock(&data->lock_als);
+		ret = regmap_field_write(data->reg_als_intr, state);
+		mutex_unlock(&data->lock_als);
+		return ret;
+	case IIO_PROXIMITY:
+		mutex_lock(&data->lock_ps);
+		ret = regmap_field_write(data->reg_ps_intr, state);
+		mutex_unlock(&data->lock_ps);
+		return ret;
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t ltr501_show_proximity_scale_avail(struct device *dev,
+						 struct device_attribute *attr,
+						 char *buf)
+{
+	struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
+	const struct ltr501_chip_info *info = data->chip_info;
+	ssize_t len = 0;
+	int i;
+
+	for (i = 0; i < info->ps_gain_tbl_size; i++) {
+		if (info->ps_gain[i].scale == LTR501_RESERVED_GAIN)
+			continue;
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
+				 info->ps_gain[i].scale,
+				 info->ps_gain[i].uscale);
+	}
+
+	buf[len - 1] = '\n';
+
+	return len;
+}
+
+static ssize_t ltr501_show_intensity_scale_avail(struct device *dev,
+						 struct device_attribute *attr,
+						 char *buf)
+{
+	struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
+	const struct ltr501_chip_info *info = data->chip_info;
+	ssize_t len = 0;
+	int i;
+
+	for (i = 0; i < info->als_gain_tbl_size; i++) {
+		if (info->als_gain[i].scale == LTR501_RESERVED_GAIN)
+			continue;
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
+				 info->als_gain[i].scale,
+				 info->als_gain[i].uscale);
+	}
+
+	buf[len - 1] = '\n';
+
+	return len;
+}
+
+static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5");
+
+static IIO_DEVICE_ATTR(in_proximity_scale_available, S_IRUGO,
+		       ltr501_show_proximity_scale_avail, NULL, 0);
+static IIO_DEVICE_ATTR(in_intensity_scale_available, S_IRUGO,
+		       ltr501_show_intensity_scale_avail, NULL, 0);
+
+static struct attribute *ltr501_attributes[] = {
+	&iio_dev_attr_in_proximity_scale_available.dev_attr.attr,
+	&iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
+	&iio_const_attr_integration_time_available.dev_attr.attr,
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static struct attribute *ltr301_attributes[] = {
+	&iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
+	&iio_const_attr_integration_time_available.dev_attr.attr,
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group ltr501_attribute_group = {
+	.attrs = ltr501_attributes,
+};
+
+static const struct attribute_group ltr301_attribute_group = {
+	.attrs = ltr301_attributes,
+};
+
+static const struct iio_info ltr501_info_no_irq = {
+	.read_raw = ltr501_read_raw,
+	.write_raw = ltr501_write_raw,
+	.attrs = &ltr501_attribute_group,
+};
+
+static const struct iio_info ltr501_info = {
+	.read_raw = ltr501_read_raw,
+	.write_raw = ltr501_write_raw,
+	.attrs = &ltr501_attribute_group,
+	.read_event_value	= &ltr501_read_event,
+	.write_event_value	= &ltr501_write_event,
+	.read_event_config	= &ltr501_read_event_config,
+	.write_event_config	= &ltr501_write_event_config,
+};
+
+static const struct iio_info ltr301_info_no_irq = {
+	.read_raw = ltr501_read_raw,
+	.write_raw = ltr501_write_raw,
+	.attrs = &ltr301_attribute_group,
+};
+
+static const struct iio_info ltr301_info = {
+	.read_raw = ltr501_read_raw,
+	.write_raw = ltr501_write_raw,
+	.attrs = &ltr301_attribute_group,
+	.read_event_value	= &ltr501_read_event,
+	.write_event_value	= &ltr501_write_event,
+	.read_event_config	= &ltr501_read_event_config,
+	.write_event_config	= &ltr501_write_event_config,
+};
+
+static const struct ltr501_chip_info ltr501_chip_info_tbl[] = {
+	[ltr501] = {
+		.partid = 0x08,
+		.als_gain = ltr501_als_gain_tbl,
+		.als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
+		.ps_gain = ltr501_ps_gain_tbl,
+		.ps_gain_tbl_size = ARRAY_SIZE(ltr501_ps_gain_tbl),
+		.als_mode_active = BIT(0) | BIT(1),
+		.als_gain_mask = BIT(3),
+		.als_gain_shift = 3,
+		.info = &ltr501_info,
+		.info_no_irq = &ltr501_info_no_irq,
+		.channels = ltr501_channels,
+		.no_channels = ARRAY_SIZE(ltr501_channels),
+	},
+	[ltr559] = {
+		.partid = 0x09,
+		.als_gain = ltr559_als_gain_tbl,
+		.als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),
+		.ps_gain = ltr559_ps_gain_tbl,
+		.ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl),
+		.als_mode_active = BIT(0),
+		.als_gain_mask = BIT(2) | BIT(3) | BIT(4),
+		.als_gain_shift = 2,
+		.info = &ltr501_info,
+		.info_no_irq = &ltr501_info_no_irq,
+		.channels = ltr501_channels,
+		.no_channels = ARRAY_SIZE(ltr501_channels),
+	},
+	[ltr301] = {
+		.partid = 0x08,
+		.als_gain = ltr501_als_gain_tbl,
+		.als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
+		.als_mode_active = BIT(0) | BIT(1),
+		.als_gain_mask = BIT(3),
+		.als_gain_shift = 3,
+		.info = &ltr301_info,
+		.info_no_irq = &ltr301_info_no_irq,
+		.channels = ltr301_channels,
+		.no_channels = ARRAY_SIZE(ltr301_channels),
+	},
+	[ltr303] = {
+		.partid = 0x0A,
+		.als_gain = ltr559_als_gain_tbl,
+		.als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),
+		.als_mode_active = BIT(0),
+		.als_gain_mask = BIT(2) | BIT(3) | BIT(4),
+		.als_gain_shift = 2,
+		.info = &ltr301_info,
+		.info_no_irq = &ltr301_info_no_irq,
+		.channels = ltr301_channels,
+		.no_channels = ARRAY_SIZE(ltr301_channels),
+	},
+};
+
+static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val)
+{
+	int ret;
+
+	ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val);
+	if (ret < 0)
+		return ret;
+
+	return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val);
+}
+
+static irqreturn_t ltr501_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ltr501_data *data = iio_priv(indio_dev);
+	struct {
+		u16 channels[3];
+		s64 ts __aligned(8);
+	} scan;
+	__le16 als_buf[2];
+	u8 mask = 0;
+	int j = 0;
+	int ret, psdata;
+
+	memset(&scan, 0, sizeof(scan));
+
+	/* figure out which data needs to be ready */
+	if (test_bit(0, indio_dev->active_scan_mask) ||
+	    test_bit(1, indio_dev->active_scan_mask))
+		mask |= LTR501_STATUS_ALS_RDY;
+	if (test_bit(2, indio_dev->active_scan_mask))
+		mask |= LTR501_STATUS_PS_RDY;
+
+	ret = ltr501_drdy(data, mask);
+	if (ret < 0)
+		goto done;
+
+	if (mask & LTR501_STATUS_ALS_RDY) {
+		ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
+				       als_buf, sizeof(als_buf));
+		if (ret < 0)
+			goto done;
+		if (test_bit(0, indio_dev->active_scan_mask))
+			scan.channels[j++] = le16_to_cpu(als_buf[1]);
+		if (test_bit(1, indio_dev->active_scan_mask))
+			scan.channels[j++] = le16_to_cpu(als_buf[0]);
+	}
+
+	if (mask & LTR501_STATUS_PS_RDY) {
+		ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
+				       &psdata, 2);
+		if (ret < 0)
+			goto done;
+		scan.channels[j++] = psdata & LTR501_PS_DATA_MASK;
+	}
+
+	iio_push_to_buffers_with_timestamp(indio_dev, &scan,
+					   iio_get_time_ns(indio_dev));
+
+done:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ltr501_interrupt_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct ltr501_data *data = iio_priv(indio_dev);
+	int ret, status;
+
+	ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"irq read int reg failed\n");
+		return IRQ_HANDLED;
+	}
+
+	if (status & LTR501_STATUS_ALS_INTR)
+		iio_push_event(indio_dev,
+			       IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
+						    IIO_EV_TYPE_THRESH,
+						    IIO_EV_DIR_EITHER),
+			       iio_get_time_ns(indio_dev));
+
+	if (status & LTR501_STATUS_PS_INTR)
+		iio_push_event(indio_dev,
+			       IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+						    IIO_EV_TYPE_THRESH,
+						    IIO_EV_DIR_EITHER),
+			       iio_get_time_ns(indio_dev));
+
+	return IRQ_HANDLED;
+}
+
+static int ltr501_init(struct ltr501_data *data)
+{
+	int ret, status;
+
+	ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
+	if (ret < 0)
+		return ret;
+
+	data->als_contr = status | data->chip_info->als_mode_active;
+
+	ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status);
+	if (ret < 0)
+		return ret;
+
+	data->ps_contr = status | LTR501_CONTR_ACTIVE;
+
+	ret = ltr501_read_intr_prst(data, IIO_INTENSITY, &data->als_period);
+	if (ret < 0)
+		return ret;
+
+	ret = ltr501_read_intr_prst(data, IIO_PROXIMITY, &data->ps_period);
+	if (ret < 0)
+		return ret;
+
+	return ltr501_write_contr(data, data->als_contr, data->ps_contr);
+}
+
+static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case LTR501_ALS_DATA1:
+	case LTR501_ALS_DATA1_UPPER:
+	case LTR501_ALS_DATA0:
+	case LTR501_ALS_DATA0_UPPER:
+	case LTR501_ALS_PS_STATUS:
+	case LTR501_PS_DATA:
+	case LTR501_PS_DATA_UPPER:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config ltr501_regmap_config = {
+	.name =  LTR501_REGMAP_NAME,
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = LTR501_MAX_REG,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_reg = ltr501_is_volatile_reg,
+};
+
+static int ltr501_powerdown(struct ltr501_data *data)
+{
+	return ltr501_write_contr(data, data->als_contr &
+				  ~data->chip_info->als_mode_active,
+				  data->ps_contr & ~LTR501_CONTR_ACTIVE);
+}
+
+static const char *ltr501_match_acpi_device(struct device *dev, int *chip_idx)
+{
+	const struct acpi_device_id *id;
+
+	id = acpi_match_device(dev->driver->acpi_match_table, dev);
+	if (!id)
+		return NULL;
+	*chip_idx = id->driver_data;
+	return dev_name(dev);
+}
+
+static int ltr501_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *id = i2c_client_get_device_id(client);
+	static const char * const regulator_names[] = { "vdd", "vddio" };
+	struct ltr501_data *data;
+	struct iio_dev *indio_dev;
+	struct regmap *regmap;
+	int ret, partid, chip_idx = 0;
+	const char *name = NULL;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	regmap = devm_regmap_init_i2c(client, &ltr501_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Regmap initialization failed.\n");
+		return PTR_ERR(regmap);
+	}
+
+	data = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	data->client = client;
+	data->regmap = regmap;
+	mutex_init(&data->lock_als);
+	mutex_init(&data->lock_ps);
+
+	ret = devm_regulator_bulk_get_enable(&client->dev,
+					     ARRAY_SIZE(regulator_names),
+					     regulator_names);
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "Failed to get regulators\n");
+
+	data->reg_it = devm_regmap_field_alloc(&client->dev, regmap,
+					       reg_field_it);
+	if (IS_ERR(data->reg_it)) {
+		dev_err(&client->dev, "Integ time reg field init failed.\n");
+		return PTR_ERR(data->reg_it);
+	}
+
+	data->reg_als_intr = devm_regmap_field_alloc(&client->dev, regmap,
+						     reg_field_als_intr);
+	if (IS_ERR(data->reg_als_intr)) {
+		dev_err(&client->dev, "ALS intr mode reg field init failed\n");
+		return PTR_ERR(data->reg_als_intr);
+	}
+
+	data->reg_ps_intr = devm_regmap_field_alloc(&client->dev, regmap,
+						    reg_field_ps_intr);
+	if (IS_ERR(data->reg_ps_intr)) {
+		dev_err(&client->dev, "PS intr mode reg field init failed.\n");
+		return PTR_ERR(data->reg_ps_intr);
+	}
+
+	data->reg_als_rate = devm_regmap_field_alloc(&client->dev, regmap,
+						     reg_field_als_rate);
+	if (IS_ERR(data->reg_als_rate)) {
+		dev_err(&client->dev, "ALS samp rate field init failed.\n");
+		return PTR_ERR(data->reg_als_rate);
+	}
+
+	data->reg_ps_rate = devm_regmap_field_alloc(&client->dev, regmap,
+						    reg_field_ps_rate);
+	if (IS_ERR(data->reg_ps_rate)) {
+		dev_err(&client->dev, "PS samp rate field init failed.\n");
+		return PTR_ERR(data->reg_ps_rate);
+	}
+
+	data->reg_als_prst = devm_regmap_field_alloc(&client->dev, regmap,
+						     reg_field_als_prst);
+	if (IS_ERR(data->reg_als_prst)) {
+		dev_err(&client->dev, "ALS prst reg field init failed\n");
+		return PTR_ERR(data->reg_als_prst);
+	}
+
+	data->reg_ps_prst = devm_regmap_field_alloc(&client->dev, regmap,
+						    reg_field_ps_prst);
+	if (IS_ERR(data->reg_ps_prst)) {
+		dev_err(&client->dev, "PS prst reg field init failed.\n");
+		return PTR_ERR(data->reg_ps_prst);
+	}
+
+	ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
+	if (ret < 0)
+		return ret;
+
+	if (id) {
+		name = id->name;
+		chip_idx = id->driver_data;
+	} else  if (ACPI_HANDLE(&client->dev)) {
+		name = ltr501_match_acpi_device(&client->dev, &chip_idx);
+	} else {
+		return -ENODEV;
+	}
+
+	data->chip_info = &ltr501_chip_info_tbl[chip_idx];
+
+	if ((partid >> 4) != data->chip_info->partid)
+		return -ENODEV;
+
+	if (device_property_read_u32(&client->dev, "proximity-near-level",
+				     &data->near_level))
+		data->near_level = 0;
+
+	indio_dev->info = data->chip_info->info;
+	indio_dev->channels = data->chip_info->channels;
+	indio_dev->num_channels = data->chip_info->no_channels;
+	indio_dev->name = name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	ret = ltr501_init(data);
+	if (ret < 0)
+		return ret;
+
+	if (client->irq > 0) {
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
+						NULL, ltr501_interrupt_handler,
+						IRQF_TRIGGER_FALLING |
+						IRQF_ONESHOT,
+						"ltr501_thresh_event",
+						indio_dev);
+		if (ret) {
+			dev_err(&client->dev, "request irq (%d) failed\n",
+				client->irq);
+			return ret;
+		}
+	} else {
+		indio_dev->info = data->chip_info->info_no_irq;
+	}
+
+	ret = iio_triggered_buffer_setup(indio_dev, NULL,
+					 ltr501_trigger_handler, NULL);
+	if (ret)
+		goto powerdown_on_error;
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto error_unreg_buffer;
+
+	return 0;
+
+error_unreg_buffer:
+	iio_triggered_buffer_cleanup(indio_dev);
+powerdown_on_error:
+	ltr501_powerdown(data);
+	return ret;
+}
+
+static void ltr501_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+	iio_device_unregister(indio_dev);
+	iio_triggered_buffer_cleanup(indio_dev);
+	ltr501_powerdown(iio_priv(indio_dev));
+}
+
+static int ltr501_suspend(struct device *dev)
+{
+	struct ltr501_data *data = iio_priv(i2c_get_clientdata(
+					    to_i2c_client(dev)));
+	return ltr501_powerdown(data);
+}
+
+static int ltr501_resume(struct device *dev)
+{
+	struct ltr501_data *data = iio_priv(i2c_get_clientdata(
+					    to_i2c_client(dev)));
+
+	return ltr501_write_contr(data, data->als_contr,
+		data->ps_contr);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume);
+
+static const struct acpi_device_id ltr_acpi_match[] = {
+	{ "LTER0501", ltr501 },
+	{ "LTER0559", ltr559 },
+	{ "LTER0301", ltr301 },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, ltr_acpi_match);
+
+static const struct i2c_device_id ltr501_id[] = {
+	{ "ltr501", ltr501 },
+	{ "ltr559", ltr559 },
+	{ "ltr301", ltr301 },
+	{ "ltr303", ltr303 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ltr501_id);
+
+static const struct of_device_id ltr501_of_match[] = {
+	{ .compatible = "liteon,ltr501", },
+	{ .compatible = "liteon,ltr559", },
+	{ .compatible = "liteon,ltr301", },
+	{ .compatible = "liteon,ltr303", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ltr501_of_match);
+
+static struct i2c_driver ltr501_driver = {
+	.driver = {
+		.name   = LTR501_DRV_NAME,
+		.of_match_table = ltr501_of_match,
+		.pm	= pm_sleep_ptr(&ltr501_pm_ops),
+		.acpi_match_table = ACPI_PTR(ltr_acpi_match),
+	},
+	.probe_new = ltr501_probe,
+	.remove	= ltr501_remove,
+	.id_table = ltr501_id,
+};
+
+module_i2c_driver(ltr501_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_DESCRIPTION("Lite-On LTR501 ambient light and proximity sensor driver");
+MODULE_LICENSE("GPL");