Merge tag 'iio-for-6.6a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into char-misc-next

Jonathan writes:

1st set of IIO new device support, features and cleanup for 6.6

New device support
* adi,ad8366
  - Add support for the HMC792 digital attenuator (mostly chip specific data)
* alwinner,sun20i-gpadc
  - New driver for the integrated ADC on a number of allwinner SoCs
    including dt-binding documentation.
* microchip,mcp4728
  - New driver for this quad channel DAC. Includes dt-bindings.
* miramems, da280
  - Add ID for DA217 accelerometer which is compatible with the da280.
* murata,irs-d200
  - New driver for this passive infrared sensor typically used for human
    detection. Includes bindings and a few pieces of new ABI to
    cover a case of needing to count a number of repeats of an event
    before reporting it.
* rohm,bu27008
  - Add initial support for the BU27010 RGB + flickering sensor to this
    driver. Substantial refactoring was needed to enable this.

Features
* adi,admv8818
  - Add mode that bypasses the input and output filters.
* amlogic,meson
  - Support control of the MUX on channel 7, exposed as multiple channels.
  - Support channel labels.
* sensirion,scd4x
  - Add pressure compensation. Controlled via an 'output' pressure channel.
* ti,lmp92040
  - Add IIO buffered supported (read via chrdev).
* vishay,vcnl4000
  - Add proximity interrupt support for vcnl4200.
  - Add proximity integration time control for vcnl4200.
  - Add illuminance integration time control for vcnl4040 and vcnl4200.
  - Add calibration bias, proximity and illuminance event period, and
    oversampling ratio control for vcnl4040 and vncl4200.

Cleanup and minor fixes
* core
  - Tidy up handling of set_trigger_state() callback return values
    to consistently assume no positive return values.
  - Use min() rather than min_t() in a case where types were clearly
    the same.
  - Drop some else statements that follow continue with a loop or
    a returns.
  - White space and comment format cleanup.
  - Use sysfs_match_string() helper to improve readability.
  - Use krealloc_array() to make it explicit a krealloc is for an array
    of structures, not just one.
* tools
  - Tidy up potential overflow in array index.
* tree wide
  - Fix up includes for DT related headers.
  - Drop some error prints in places where as similar error message
    is printed by the function being called.
  - Tidy up handling of return value from platform_get_irq() to no longer
    take into account 0 as a value that might be returned. Similar for
    fwnode_irq_get().
* adi,ad7192
  - Add missing error check and improved debug logging.
  - Use sysfs_emit_at() rather than open coded variant.
* adi,adis16475
  - Drop unused scan element enum entries.
  - Specify that a few more devices support burst32 mode.
* adi,admv1013
  - Enable all required regulators and document as required in the
    dt-binding.
* adi,admv1014
  - Make all regulators required in the dt-binding as the device needs
    them all enabled.
* adi,adxl313
  - Fix wrong enum values being used in the i2c_device_id table.
  - Use i2c_get_match_data() to reduce open coded handling of the
    various id tables.
* allwinner,gpadc
  - Make the kconfig text more specific to make space for separate drivers
    for other Allwinner devices.
* amlogic,meson
  - Drop unused timestamp channels as no buffer support.
  - Various minor reorganizations to enable addition of support channel 7
    MUX.
  - Initialize some default values to account for potential previous user
    since reboot.
* qcom,spmi-adc5
  - Add ADC5_GPIO2_100K_PU support to driver to line up with bindings.
* qcom,spmi-adc7
  - Use predefined channel ID definitions rather than values.
* invensense, common
  - Factor out the timestamp handling to a module used by both mpu6050 and
    icm42600.
* invensense,mpu6050
  - Read as many FIFO elements as possible in one bus access.
* men,s188
  - Drop redundant initialization of driver owner field.
* microchip,mcp4018 and mcp4531
  - Use i2c_get_match_data() instead of open coding. Includes making the
    data format the same for the i2c_device_id and firmware match
    tables.
* semtech,sx9310
  - dt-bindings: Add reference to IIO schema to provide the label property.
* semtech,sx9324
  - dt-bindings: Add reference to IIO schema to provide the label property.
* st,stm32-adc
  - Use devm_platform_get_and_ioremap_resource() instead of open coded
    version.
* st,stm-lptimer-trigger
  - Drop setting platform drvdata as it wasn't then used.
* ti,ads1015
  - Fix wrong dt binding description of ti,datarate for some devices.
* vishay,vcnl4200
  - Move to switch statements for channel type checking to make later
    additions simpler.

* tag 'iio-for-6.6a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (73 commits)
  Documentation: ABI: testing: admv8818: add bypass
  drivers: iio: filter: admv8818: add bypass mode
  iio: light: bd27008: Support BD27010 RGB
  iio: light: bu27008: add chip info
  dt-bindings: iio: ROHM BU27010 RGBC + flickering sensor
  iio: add MCP4728 I2C DAC driver
  dt-bindings: iio: dac: add mcp4728.yaml
  drivers: iio: admv1013: add vcc regulators
  dt-bindings: iio: admv1013: add vcc regulators
  iio: trigger: stm32-lptimer-trigger: remove unneeded platform_set_drvdata()
  iio: adc: men_z188_adc: Remove redundant initialization owner in men_z188_driver
  dt-bindings: iio: admv1014: make all regs required
  iio: cdc: ad7150: relax return value check for IRQ get
  iio: mb1232: relax return value check for IRQ get
  iio: adc: fix the return value handle for platform_get_irq()
  tools: iio: iio_generic_buffer: Fix some integer type and calculation
  iio: potentiometer: mcp4531: Use i2c_get_match_data()
  iio: potentiometer: mcp4018: Use i2c_get_match_data()
  iio: core: Fix issues and style of the comments
  iio: core: Switch to krealloc_array()
  ...

2 files changed, 97 insertions, 0 deletions

diff --git a/include/linux/iio/common/inv_sensors_timestamp.h b/include/linux/iio/common/inv_sensors_timestamp.h
new file mode 100644
index 000000000000..a47d304d1ba7
--- /dev/null
+++ b/include/linux/iio/common/inv_sensors_timestamp.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020 Invensense, Inc.
+ */
+
+#ifndef INV_SENSORS_TIMESTAMP_H_
+#define INV_SENSORS_TIMESTAMP_H_
+
+/**
+ * struct inv_sensors_timestamp_chip - chip internal properties
+ * @clock_period:	internal clock period in ns
+ * @jitter:		acceptable jitter in per-mille
+ * @init_period:	chip initial period at reset in ns
+ */
+struct inv_sensors_timestamp_chip {
+	uint32_t clock_period;
+	uint32_t jitter;
+	uint32_t init_period;
+};
+
+/**
+ * struct inv_sensors_timestamp_interval - timestamps interval
+ * @lo:	interval lower bound
+ * @up:	interval upper bound
+ */
+struct inv_sensors_timestamp_interval {
+	int64_t lo;
+	int64_t up;
+};
+
+/**
+ * struct inv_sensors_timestamp_acc - accumulator for computing an estimation
+ * @val:	current estimation of the value, the mean of all values
+ * @idx:	current index of the next free place in values table
+ * @values:	table of all measured values, use for computing the mean
+ */
+struct inv_sensors_timestamp_acc {
+	uint32_t val;
+	size_t idx;
+	uint32_t values[32];
+};
+
+/**
+ * struct inv_sensors_timestamp - timestamp management states
+ * @chip:		chip internal characteristics
+ * @min_period:		minimal acceptable clock period
+ * @max_period:		maximal acceptable clock period
+ * @it:			interrupts interval timestamps
+ * @timestamp:		store last timestamp for computing next data timestamp
+ * @mult:		current internal period multiplier
+ * @new_mult:		new set internal period multiplier (not yet effective)
+ * @period:		measured current period of the sensor
+ * @chip_period:	accumulator for computing internal chip period
+ */
+struct inv_sensors_timestamp {
+	struct inv_sensors_timestamp_chip chip;
+	uint32_t min_period;
+	uint32_t max_period;
+	struct inv_sensors_timestamp_interval it;
+	int64_t timestamp;
+	uint32_t mult;
+	uint32_t new_mult;
+	uint32_t period;
+	struct inv_sensors_timestamp_acc chip_period;
+};
+
+void inv_sensors_timestamp_init(struct inv_sensors_timestamp *ts,
+				const struct inv_sensors_timestamp_chip *chip);
+
+int inv_sensors_timestamp_update_odr(struct inv_sensors_timestamp *ts,
+				     uint32_t period, bool fifo);
+
+void inv_sensors_timestamp_interrupt(struct inv_sensors_timestamp *ts,
+				     uint32_t fifo_period, size_t fifo_nb,
+				     size_t sensor_nb, int64_t timestamp);
+
+static inline int64_t inv_sensors_timestamp_pop(struct inv_sensors_timestamp *ts)
+{
+	ts->timestamp += ts->period;
+	return ts->timestamp;
+}
+
+void inv_sensors_timestamp_apply_odr(struct inv_sensors_timestamp *ts,
+				     uint32_t fifo_period, size_t fifo_nb,
+				     unsigned int fifo_no);
+
+static inline void inv_sensors_timestamp_reset(struct inv_sensors_timestamp *ts)
+{
+	const struct inv_sensors_timestamp_interval interval_init = {0LL, 0LL};
+
+	ts->it = interval_init;
+	ts->timestamp = 0;
+}
+
+#endif
diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index 82faa98c719a..117bde7d6ad7 100644
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -19,6 +19,8 @@ enum iio_event_info {
 	IIO_EV_INFO_TIMEOUT,
 	IIO_EV_INFO_RESET_TIMEOUT,
 	IIO_EV_INFO_TAP2_MIN_DELAY,
+	IIO_EV_INFO_RUNNING_PERIOD,
+	IIO_EV_INFO_RUNNING_COUNT,
 };
 
 #define IIO_VAL_INT 1