2033 lines
52 KiB
C
2033 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* The industrial I/O core
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* Based on elements of hwmon and input subsystems.
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*/
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#define pr_fmt(fmt) "iio-core: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/idr.h>
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#include <linux/kdev_t.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/property.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/cdev.h>
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#include <linux/slab.h>
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#include <linux/anon_inodes.h>
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#include <linux/debugfs.h>
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#include <linux/mutex.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/iio-opaque.h>
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#include "iio_core.h"
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#include "iio_core_trigger.h"
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/buffer_impl.h>
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/* IDA to assign each registered device a unique id */
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static DEFINE_IDA(iio_ida);
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static dev_t iio_devt;
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#define IIO_DEV_MAX 256
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struct bus_type iio_bus_type = {
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.name = "iio",
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};
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EXPORT_SYMBOL(iio_bus_type);
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static struct dentry *iio_debugfs_dentry;
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static const char * const iio_direction[] = {
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[0] = "in",
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[1] = "out",
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};
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static const char * const iio_chan_type_name_spec[] = {
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[IIO_VOLTAGE] = "voltage",
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[IIO_CURRENT] = "current",
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[IIO_POWER] = "power",
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[IIO_ACCEL] = "accel",
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[IIO_ANGL_VEL] = "anglvel",
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[IIO_MAGN] = "magn",
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[IIO_LIGHT] = "illuminance",
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[IIO_INTENSITY] = "intensity",
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[IIO_PROXIMITY] = "proximity",
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[IIO_TEMP] = "temp",
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[IIO_INCLI] = "incli",
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[IIO_ROT] = "rot",
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[IIO_ANGL] = "angl",
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[IIO_TIMESTAMP] = "timestamp",
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[IIO_CAPACITANCE] = "capacitance",
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[IIO_ALTVOLTAGE] = "altvoltage",
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[IIO_CCT] = "cct",
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[IIO_PRESSURE] = "pressure",
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[IIO_HUMIDITYRELATIVE] = "humidityrelative",
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[IIO_ACTIVITY] = "activity",
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[IIO_STEPS] = "steps",
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[IIO_ENERGY] = "energy",
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[IIO_DISTANCE] = "distance",
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[IIO_VELOCITY] = "velocity",
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[IIO_CONCENTRATION] = "concentration",
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[IIO_RESISTANCE] = "resistance",
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[IIO_PH] = "ph",
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[IIO_UVINDEX] = "uvindex",
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[IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
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[IIO_COUNT] = "count",
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[IIO_INDEX] = "index",
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[IIO_GRAVITY] = "gravity",
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[IIO_POSITIONRELATIVE] = "positionrelative",
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[IIO_PHASE] = "phase",
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[IIO_MASSCONCENTRATION] = "massconcentration",
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};
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static const char * const iio_modifier_names[] = {
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[IIO_MOD_X] = "x",
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[IIO_MOD_Y] = "y",
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[IIO_MOD_Z] = "z",
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[IIO_MOD_X_AND_Y] = "x&y",
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[IIO_MOD_X_AND_Z] = "x&z",
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[IIO_MOD_Y_AND_Z] = "y&z",
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[IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
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[IIO_MOD_X_OR_Y] = "x|y",
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[IIO_MOD_X_OR_Z] = "x|z",
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[IIO_MOD_Y_OR_Z] = "y|z",
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[IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
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[IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
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[IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
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[IIO_MOD_LIGHT_BOTH] = "both",
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[IIO_MOD_LIGHT_IR] = "ir",
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[IIO_MOD_LIGHT_CLEAR] = "clear",
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[IIO_MOD_LIGHT_RED] = "red",
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[IIO_MOD_LIGHT_GREEN] = "green",
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[IIO_MOD_LIGHT_BLUE] = "blue",
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[IIO_MOD_LIGHT_UV] = "uv",
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[IIO_MOD_LIGHT_DUV] = "duv",
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[IIO_MOD_QUATERNION] = "quaternion",
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[IIO_MOD_TEMP_AMBIENT] = "ambient",
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[IIO_MOD_TEMP_OBJECT] = "object",
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[IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
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[IIO_MOD_NORTH_TRUE] = "from_north_true",
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[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
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[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
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[IIO_MOD_RUNNING] = "running",
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[IIO_MOD_JOGGING] = "jogging",
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[IIO_MOD_WALKING] = "walking",
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[IIO_MOD_STILL] = "still",
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[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
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[IIO_MOD_I] = "i",
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[IIO_MOD_Q] = "q",
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[IIO_MOD_CO2] = "co2",
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[IIO_MOD_VOC] = "voc",
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[IIO_MOD_PM1] = "pm1",
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[IIO_MOD_PM2P5] = "pm2p5",
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[IIO_MOD_PM4] = "pm4",
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[IIO_MOD_PM10] = "pm10",
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[IIO_MOD_ETHANOL] = "ethanol",
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[IIO_MOD_H2] = "h2",
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[IIO_MOD_O2] = "o2",
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};
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/* relies on pairs of these shared then separate */
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static const char * const iio_chan_info_postfix[] = {
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[IIO_CHAN_INFO_RAW] = "raw",
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[IIO_CHAN_INFO_PROCESSED] = "input",
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[IIO_CHAN_INFO_SCALE] = "scale",
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[IIO_CHAN_INFO_OFFSET] = "offset",
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[IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
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[IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
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[IIO_CHAN_INFO_PEAK] = "peak_raw",
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[IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
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[IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
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[IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
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[IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
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= "filter_low_pass_3db_frequency",
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[IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
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= "filter_high_pass_3db_frequency",
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[IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
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[IIO_CHAN_INFO_FREQUENCY] = "frequency",
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[IIO_CHAN_INFO_PHASE] = "phase",
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[IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
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[IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
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[IIO_CHAN_INFO_HYSTERESIS_RELATIVE] = "hysteresis_relative",
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[IIO_CHAN_INFO_INT_TIME] = "integration_time",
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[IIO_CHAN_INFO_ENABLE] = "en",
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[IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
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[IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
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[IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
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[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
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[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
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[IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
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[IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
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[IIO_CHAN_INFO_CALIBAMBIENT] = "calibambient",
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};
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/**
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* iio_device_id() - query the unique ID for the device
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* @indio_dev: Device structure whose ID is being queried
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*
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* The IIO device ID is a unique index used for example for the naming
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* of the character device /dev/iio\:device[ID]
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*/
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int iio_device_id(struct iio_dev *indio_dev)
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{
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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return iio_dev_opaque->id;
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}
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EXPORT_SYMBOL_GPL(iio_device_id);
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/**
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* iio_sysfs_match_string_with_gaps - matches given string in an array with gaps
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* @array: array of strings
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* @n: number of strings in the array
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* @str: string to match with
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*
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* Returns index of @str in the @array or -EINVAL, similar to match_string().
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* Uses sysfs_streq instead of strcmp for matching.
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*
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* This routine will look for a string in an array of strings.
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* The search will continue until the element is found or the n-th element
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* is reached, regardless of any NULL elements in the array.
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*/
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static int iio_sysfs_match_string_with_gaps(const char * const *array, size_t n,
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const char *str)
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{
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const char *item;
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int index;
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for (index = 0; index < n; index++) {
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item = array[index];
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if (!item)
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continue;
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if (sysfs_streq(item, str))
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return index;
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}
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return -EINVAL;
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}
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#if defined(CONFIG_DEBUG_FS)
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/*
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* There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
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* iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined
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*/
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struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
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{
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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return iio_dev_opaque->debugfs_dentry;
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}
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EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
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#endif
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/**
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* iio_find_channel_from_si() - get channel from its scan index
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* @indio_dev: device
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* @si: scan index to match
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*/
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const struct iio_chan_spec
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*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
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{
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int i;
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for (i = 0; i < indio_dev->num_channels; i++)
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if (indio_dev->channels[i].scan_index == si)
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return &indio_dev->channels[i];
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return NULL;
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}
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/* This turns up an awful lot */
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ssize_t iio_read_const_attr(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sysfs_emit(buf, "%s\n", to_iio_const_attr(attr)->string);
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}
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EXPORT_SYMBOL(iio_read_const_attr);
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/**
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* iio_device_set_clock() - Set current timestamping clock for the device
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* @indio_dev: IIO device structure containing the device
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* @clock_id: timestamping clock posix identifier to set.
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*/
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int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
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{
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int ret;
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
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ret = mutex_lock_interruptible(&indio_dev->mlock);
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if (ret)
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return ret;
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if ((ev_int && iio_event_enabled(ev_int)) ||
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iio_buffer_enabled(indio_dev)) {
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mutex_unlock(&indio_dev->mlock);
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return -EBUSY;
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}
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iio_dev_opaque->clock_id = clock_id;
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mutex_unlock(&indio_dev->mlock);
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return 0;
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}
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EXPORT_SYMBOL(iio_device_set_clock);
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/**
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* iio_device_get_clock() - Retrieve current timestamping clock for the device
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* @indio_dev: IIO device structure containing the device
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*/
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clockid_t iio_device_get_clock(const struct iio_dev *indio_dev)
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{
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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return iio_dev_opaque->clock_id;
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}
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EXPORT_SYMBOL(iio_device_get_clock);
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/**
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* iio_get_time_ns() - utility function to get a time stamp for events etc
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* @indio_dev: device
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*/
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s64 iio_get_time_ns(const struct iio_dev *indio_dev)
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{
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struct timespec64 tp;
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switch (iio_device_get_clock(indio_dev)) {
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case CLOCK_REALTIME:
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return ktime_get_real_ns();
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case CLOCK_MONOTONIC:
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return ktime_get_ns();
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case CLOCK_MONOTONIC_RAW:
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return ktime_get_raw_ns();
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case CLOCK_REALTIME_COARSE:
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return ktime_to_ns(ktime_get_coarse_real());
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case CLOCK_MONOTONIC_COARSE:
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ktime_get_coarse_ts64(&tp);
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return timespec64_to_ns(&tp);
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case CLOCK_BOOTTIME:
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return ktime_get_boottime_ns();
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case CLOCK_TAI:
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return ktime_get_clocktai_ns();
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL(iio_get_time_ns);
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/**
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* iio_get_time_res() - utility function to get time stamp clock resolution in
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* nano seconds.
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* @indio_dev: device
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*/
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unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
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{
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switch (iio_device_get_clock(indio_dev)) {
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case CLOCK_REALTIME:
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case CLOCK_MONOTONIC:
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case CLOCK_MONOTONIC_RAW:
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case CLOCK_BOOTTIME:
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case CLOCK_TAI:
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return hrtimer_resolution;
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case CLOCK_REALTIME_COARSE:
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case CLOCK_MONOTONIC_COARSE:
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return LOW_RES_NSEC;
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL(iio_get_time_res);
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static int __init iio_init(void)
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{
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int ret;
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/* Register sysfs bus */
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ret = bus_register(&iio_bus_type);
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if (ret < 0) {
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pr_err("could not register bus type\n");
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goto error_nothing;
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}
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ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
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if (ret < 0) {
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pr_err("failed to allocate char dev region\n");
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goto error_unregister_bus_type;
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}
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iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
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return 0;
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error_unregister_bus_type:
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bus_unregister(&iio_bus_type);
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error_nothing:
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return ret;
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}
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static void __exit iio_exit(void)
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{
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if (iio_devt)
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unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
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bus_unregister(&iio_bus_type);
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debugfs_remove(iio_debugfs_dentry);
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}
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#if defined(CONFIG_DEBUG_FS)
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static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct iio_dev *indio_dev = file->private_data;
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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unsigned val = 0;
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int ret;
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if (*ppos > 0)
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return simple_read_from_buffer(userbuf, count, ppos,
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iio_dev_opaque->read_buf,
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iio_dev_opaque->read_buf_len);
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ret = indio_dev->info->debugfs_reg_access(indio_dev,
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iio_dev_opaque->cached_reg_addr,
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0, &val);
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if (ret) {
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dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
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return ret;
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}
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iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
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sizeof(iio_dev_opaque->read_buf),
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"0x%X\n", val);
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return simple_read_from_buffer(userbuf, count, ppos,
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iio_dev_opaque->read_buf,
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iio_dev_opaque->read_buf_len);
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}
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static ssize_t iio_debugfs_write_reg(struct file *file,
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const char __user *userbuf, size_t count, loff_t *ppos)
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{
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struct iio_dev *indio_dev = file->private_data;
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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unsigned reg, val;
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char buf[80];
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int ret;
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count = min_t(size_t, count, (sizeof(buf)-1));
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if (copy_from_user(buf, userbuf, count))
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return -EFAULT;
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buf[count] = 0;
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ret = sscanf(buf, "%i %i", ®, &val);
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switch (ret) {
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case 1:
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iio_dev_opaque->cached_reg_addr = reg;
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break;
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case 2:
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iio_dev_opaque->cached_reg_addr = reg;
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ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
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val, NULL);
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if (ret) {
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dev_err(indio_dev->dev.parent, "%s: write failed\n",
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__func__);
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return ret;
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}
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break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations iio_debugfs_reg_fops = {
|
|
.open = simple_open,
|
|
.read = iio_debugfs_read_reg,
|
|
.write = iio_debugfs_write_reg,
|
|
};
|
|
|
|
static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry);
|
|
}
|
|
|
|
static void iio_device_register_debugfs(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque;
|
|
|
|
if (indio_dev->info->debugfs_reg_access == NULL)
|
|
return;
|
|
|
|
if (!iio_debugfs_dentry)
|
|
return;
|
|
|
|
iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
|
|
iio_dev_opaque->debugfs_dentry =
|
|
debugfs_create_dir(dev_name(&indio_dev->dev),
|
|
iio_debugfs_dentry);
|
|
|
|
debugfs_create_file("direct_reg_access", 0644,
|
|
iio_dev_opaque->debugfs_dentry, indio_dev,
|
|
&iio_debugfs_reg_fops);
|
|
}
|
|
#else
|
|
static void iio_device_register_debugfs(struct iio_dev *indio_dev)
|
|
{
|
|
}
|
|
|
|
static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
|
|
{
|
|
}
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
static ssize_t iio_read_channel_ext_info(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
const struct iio_chan_spec_ext_info *ext_info;
|
|
|
|
ext_info = &this_attr->c->ext_info[this_attr->address];
|
|
|
|
return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
|
|
}
|
|
|
|
static ssize_t iio_write_channel_ext_info(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
const struct iio_chan_spec_ext_info *ext_info;
|
|
|
|
ext_info = &this_attr->c->ext_info[this_attr->address];
|
|
|
|
return ext_info->write(indio_dev, ext_info->private,
|
|
this_attr->c, buf, len);
|
|
}
|
|
|
|
ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
|
|
uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
|
|
{
|
|
const struct iio_enum *e = (const struct iio_enum *)priv;
|
|
unsigned int i;
|
|
size_t len = 0;
|
|
|
|
if (!e->num_items)
|
|
return 0;
|
|
|
|
for (i = 0; i < e->num_items; ++i) {
|
|
if (!e->items[i])
|
|
continue;
|
|
len += sysfs_emit_at(buf, len, "%s ", e->items[i]);
|
|
}
|
|
|
|
/* replace last space with a newline */
|
|
buf[len - 1] = '\n';
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_enum_available_read);
|
|
|
|
ssize_t iio_enum_read(struct iio_dev *indio_dev,
|
|
uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
|
|
{
|
|
const struct iio_enum *e = (const struct iio_enum *)priv;
|
|
int i;
|
|
|
|
if (!e->get)
|
|
return -EINVAL;
|
|
|
|
i = e->get(indio_dev, chan);
|
|
if (i < 0)
|
|
return i;
|
|
else if (i >= e->num_items || !e->items[i])
|
|
return -EINVAL;
|
|
|
|
return sysfs_emit(buf, "%s\n", e->items[i]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_enum_read);
|
|
|
|
ssize_t iio_enum_write(struct iio_dev *indio_dev,
|
|
uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
|
|
size_t len)
|
|
{
|
|
const struct iio_enum *e = (const struct iio_enum *)priv;
|
|
int ret;
|
|
|
|
if (!e->set)
|
|
return -EINVAL;
|
|
|
|
ret = iio_sysfs_match_string_with_gaps(e->items, e->num_items, buf);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = e->set(indio_dev, chan, ret);
|
|
return ret ? ret : len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_enum_write);
|
|
|
|
static const struct iio_mount_matrix iio_mount_idmatrix = {
|
|
.rotation = {
|
|
"1", "0", "0",
|
|
"0", "1", "0",
|
|
"0", "0", "1"
|
|
}
|
|
};
|
|
|
|
static int iio_setup_mount_idmatrix(const struct device *dev,
|
|
struct iio_mount_matrix *matrix)
|
|
{
|
|
*matrix = iio_mount_idmatrix;
|
|
dev_info(dev, "mounting matrix not found: using identity...\n");
|
|
return 0;
|
|
}
|
|
|
|
ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
|
|
const struct iio_chan_spec *chan, char *buf)
|
|
{
|
|
const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *)
|
|
priv)(indio_dev, chan);
|
|
|
|
if (IS_ERR(mtx))
|
|
return PTR_ERR(mtx);
|
|
|
|
if (!mtx)
|
|
mtx = &iio_mount_idmatrix;
|
|
|
|
return sysfs_emit(buf, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n",
|
|
mtx->rotation[0], mtx->rotation[1], mtx->rotation[2],
|
|
mtx->rotation[3], mtx->rotation[4], mtx->rotation[5],
|
|
mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
|
|
|
|
/**
|
|
* iio_read_mount_matrix() - retrieve iio device mounting matrix from
|
|
* device "mount-matrix" property
|
|
* @dev: device the mounting matrix property is assigned to
|
|
* @matrix: where to store retrieved matrix
|
|
*
|
|
* If device is assigned no mounting matrix property, a default 3x3 identity
|
|
* matrix will be filled in.
|
|
*
|
|
* Return: 0 if success, or a negative error code on failure.
|
|
*/
|
|
int iio_read_mount_matrix(struct device *dev, struct iio_mount_matrix *matrix)
|
|
{
|
|
size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
|
|
int err;
|
|
|
|
err = device_property_read_string_array(dev, "mount-matrix", matrix->rotation, len);
|
|
if (err == len)
|
|
return 0;
|
|
|
|
if (err >= 0)
|
|
/* Invalid number of matrix entries. */
|
|
return -EINVAL;
|
|
|
|
if (err != -EINVAL)
|
|
/* Invalid matrix declaration format. */
|
|
return err;
|
|
|
|
/* Matrix was not declared at all: fallback to identity. */
|
|
return iio_setup_mount_idmatrix(dev, matrix);
|
|
}
|
|
EXPORT_SYMBOL(iio_read_mount_matrix);
|
|
|
|
static ssize_t __iio_format_value(char *buf, size_t offset, unsigned int type,
|
|
int size, const int *vals)
|
|
{
|
|
int tmp0, tmp1;
|
|
s64 tmp2;
|
|
bool scale_db = false;
|
|
|
|
switch (type) {
|
|
case IIO_VAL_INT:
|
|
return sysfs_emit_at(buf, offset, "%d", vals[0]);
|
|
case IIO_VAL_INT_PLUS_MICRO_DB:
|
|
scale_db = true;
|
|
fallthrough;
|
|
case IIO_VAL_INT_PLUS_MICRO:
|
|
if (vals[1] < 0)
|
|
return sysfs_emit_at(buf, offset, "-%d.%06u%s",
|
|
abs(vals[0]), -vals[1],
|
|
scale_db ? " dB" : "");
|
|
else
|
|
return sysfs_emit_at(buf, offset, "%d.%06u%s", vals[0],
|
|
vals[1], scale_db ? " dB" : "");
|
|
case IIO_VAL_INT_PLUS_NANO:
|
|
if (vals[1] < 0)
|
|
return sysfs_emit_at(buf, offset, "-%d.%09u",
|
|
abs(vals[0]), -vals[1]);
|
|
else
|
|
return sysfs_emit_at(buf, offset, "%d.%09u", vals[0],
|
|
vals[1]);
|
|
case IIO_VAL_FRACTIONAL:
|
|
tmp2 = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
|
|
tmp1 = vals[1];
|
|
tmp0 = (int)div_s64_rem(tmp2, 1000000000, &tmp1);
|
|
if ((tmp2 < 0) && (tmp0 == 0))
|
|
return sysfs_emit_at(buf, offset, "-0.%09u", abs(tmp1));
|
|
else
|
|
return sysfs_emit_at(buf, offset, "%d.%09u", tmp0,
|
|
abs(tmp1));
|
|
case IIO_VAL_FRACTIONAL_LOG2:
|
|
tmp2 = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
|
|
tmp0 = (int)div_s64_rem(tmp2, 1000000000LL, &tmp1);
|
|
if (tmp0 == 0 && tmp2 < 0)
|
|
return sysfs_emit_at(buf, offset, "-0.%09u", abs(tmp1));
|
|
else
|
|
return sysfs_emit_at(buf, offset, "%d.%09u", tmp0,
|
|
abs(tmp1));
|
|
case IIO_VAL_INT_MULTIPLE:
|
|
{
|
|
int i;
|
|
int l = 0;
|
|
|
|
for (i = 0; i < size; ++i)
|
|
l += sysfs_emit_at(buf, offset + l, "%d ", vals[i]);
|
|
return l;
|
|
}
|
|
case IIO_VAL_CHAR:
|
|
return sysfs_emit_at(buf, offset, "%c", (char)vals[0]);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* iio_format_value() - Formats a IIO value into its string representation
|
|
* @buf: The buffer to which the formatted value gets written
|
|
* which is assumed to be big enough (i.e. PAGE_SIZE).
|
|
* @type: One of the IIO_VAL_* constants. This decides how the val
|
|
* and val2 parameters are formatted.
|
|
* @size: Number of IIO value entries contained in vals
|
|
* @vals: Pointer to the values, exact meaning depends on the
|
|
* type parameter.
|
|
*
|
|
* Return: 0 by default, a negative number on failure or the
|
|
* total number of characters written for a type that belongs
|
|
* to the IIO_VAL_* constant.
|
|
*/
|
|
ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals)
|
|
{
|
|
ssize_t len;
|
|
|
|
len = __iio_format_value(buf, 0, type, size, vals);
|
|
if (len >= PAGE_SIZE - 1)
|
|
return -EFBIG;
|
|
|
|
return len + sysfs_emit_at(buf, len, "\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_format_value);
|
|
|
|
static ssize_t iio_read_channel_label(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
|
|
if (!indio_dev->info->read_label)
|
|
return -EINVAL;
|
|
|
|
return indio_dev->info->read_label(indio_dev, this_attr->c, buf);
|
|
}
|
|
|
|
static ssize_t iio_read_channel_info(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int vals[INDIO_MAX_RAW_ELEMENTS];
|
|
int ret;
|
|
int val_len = 2;
|
|
|
|
if (indio_dev->info->read_raw_multi)
|
|
ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c,
|
|
INDIO_MAX_RAW_ELEMENTS,
|
|
vals, &val_len,
|
|
this_attr->address);
|
|
else
|
|
ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
|
|
&vals[0], &vals[1], this_attr->address);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return iio_format_value(buf, ret, val_len, vals);
|
|
}
|
|
|
|
static ssize_t iio_format_list(char *buf, const int *vals, int type, int length,
|
|
const char *prefix, const char *suffix)
|
|
{
|
|
ssize_t len;
|
|
int stride;
|
|
int i;
|
|
|
|
switch (type) {
|
|
case IIO_VAL_INT:
|
|
stride = 1;
|
|
break;
|
|
default:
|
|
stride = 2;
|
|
break;
|
|
}
|
|
|
|
len = sysfs_emit(buf, prefix);
|
|
|
|
for (i = 0; i <= length - stride; i += stride) {
|
|
if (i != 0) {
|
|
len += sysfs_emit_at(buf, len, " ");
|
|
if (len >= PAGE_SIZE)
|
|
return -EFBIG;
|
|
}
|
|
|
|
len += __iio_format_value(buf, len, type, stride, &vals[i]);
|
|
if (len >= PAGE_SIZE)
|
|
return -EFBIG;
|
|
}
|
|
|
|
len += sysfs_emit_at(buf, len, "%s\n", suffix);
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t iio_format_avail_list(char *buf, const int *vals,
|
|
int type, int length)
|
|
{
|
|
|
|
return iio_format_list(buf, vals, type, length, "", "");
|
|
}
|
|
|
|
static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
|
|
{
|
|
return iio_format_list(buf, vals, type, 3, "[", "]");
|
|
}
|
|
|
|
static ssize_t iio_read_channel_info_avail(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
const int *vals;
|
|
int ret;
|
|
int length;
|
|
int type;
|
|
|
|
ret = indio_dev->info->read_avail(indio_dev, this_attr->c,
|
|
&vals, &type, &length,
|
|
this_attr->address);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
switch (ret) {
|
|
case IIO_AVAIL_LIST:
|
|
return iio_format_avail_list(buf, vals, type, length);
|
|
case IIO_AVAIL_RANGE:
|
|
return iio_format_avail_range(buf, vals, type);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __iio_str_to_fixpoint() - Parse a fixed-point number from a string
|
|
* @str: The string to parse
|
|
* @fract_mult: Multiplier for the first decimal place, should be a power of 10
|
|
* @integer: The integer part of the number
|
|
* @fract: The fractional part of the number
|
|
* @scale_db: True if this should parse as dB
|
|
*
|
|
* Returns 0 on success, or a negative error code if the string could not be
|
|
* parsed.
|
|
*/
|
|
static int __iio_str_to_fixpoint(const char *str, int fract_mult,
|
|
int *integer, int *fract, bool scale_db)
|
|
{
|
|
int i = 0, f = 0;
|
|
bool integer_part = true, negative = false;
|
|
|
|
if (fract_mult == 0) {
|
|
*fract = 0;
|
|
|
|
return kstrtoint(str, 0, integer);
|
|
}
|
|
|
|
if (str[0] == '-') {
|
|
negative = true;
|
|
str++;
|
|
} else if (str[0] == '+') {
|
|
str++;
|
|
}
|
|
|
|
while (*str) {
|
|
if ('0' <= *str && *str <= '9') {
|
|
if (integer_part) {
|
|
i = i * 10 + *str - '0';
|
|
} else {
|
|
f += fract_mult * (*str - '0');
|
|
fract_mult /= 10;
|
|
}
|
|
} else if (*str == '\n') {
|
|
if (*(str + 1) == '\0')
|
|
break;
|
|
else
|
|
return -EINVAL;
|
|
} else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
|
|
/* Ignore the dB suffix */
|
|
str += sizeof(" dB") - 1;
|
|
continue;
|
|
} else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) {
|
|
/* Ignore the dB suffix */
|
|
str += sizeof("dB") - 1;
|
|
continue;
|
|
} else if (*str == '.' && integer_part) {
|
|
integer_part = false;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
str++;
|
|
}
|
|
|
|
if (negative) {
|
|
if (i)
|
|
i = -i;
|
|
else
|
|
f = -f;
|
|
}
|
|
|
|
*integer = i;
|
|
*fract = f;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iio_str_to_fixpoint() - Parse a fixed-point number from a string
|
|
* @str: The string to parse
|
|
* @fract_mult: Multiplier for the first decimal place, should be a power of 10
|
|
* @integer: The integer part of the number
|
|
* @fract: The fractional part of the number
|
|
*
|
|
* Returns 0 on success, or a negative error code if the string could not be
|
|
* parsed.
|
|
*/
|
|
int iio_str_to_fixpoint(const char *str, int fract_mult,
|
|
int *integer, int *fract)
|
|
{
|
|
return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
|
|
|
|
static ssize_t iio_write_channel_info(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int ret, fract_mult = 100000;
|
|
int integer, fract = 0;
|
|
bool is_char = false;
|
|
bool scale_db = false;
|
|
|
|
/* Assumes decimal - precision based on number of digits */
|
|
if (!indio_dev->info->write_raw)
|
|
return -EINVAL;
|
|
|
|
if (indio_dev->info->write_raw_get_fmt)
|
|
switch (indio_dev->info->write_raw_get_fmt(indio_dev,
|
|
this_attr->c, this_attr->address)) {
|
|
case IIO_VAL_INT:
|
|
fract_mult = 0;
|
|
break;
|
|
case IIO_VAL_INT_PLUS_MICRO_DB:
|
|
scale_db = true;
|
|
fallthrough;
|
|
case IIO_VAL_INT_PLUS_MICRO:
|
|
fract_mult = 100000;
|
|
break;
|
|
case IIO_VAL_INT_PLUS_NANO:
|
|
fract_mult = 100000000;
|
|
break;
|
|
case IIO_VAL_CHAR:
|
|
is_char = true;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (is_char) {
|
|
char ch;
|
|
|
|
if (sscanf(buf, "%c", &ch) != 1)
|
|
return -EINVAL;
|
|
integer = ch;
|
|
} else {
|
|
ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
|
|
scale_db);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
|
|
integer, fract, this_attr->address);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return len;
|
|
}
|
|
|
|
static
|
|
int __iio_device_attr_init(struct device_attribute *dev_attr,
|
|
const char *postfix,
|
|
struct iio_chan_spec const *chan,
|
|
ssize_t (*readfunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf),
|
|
ssize_t (*writefunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len),
|
|
enum iio_shared_by shared_by)
|
|
{
|
|
int ret = 0;
|
|
char *name = NULL;
|
|
char *full_postfix;
|
|
sysfs_attr_init(&dev_attr->attr);
|
|
|
|
/* Build up postfix of <extend_name>_<modifier>_postfix */
|
|
if (chan->modified && (shared_by == IIO_SEPARATE)) {
|
|
if (chan->extend_name)
|
|
full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
|
|
iio_modifier_names[chan
|
|
->channel2],
|
|
chan->extend_name,
|
|
postfix);
|
|
else
|
|
full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
|
|
iio_modifier_names[chan
|
|
->channel2],
|
|
postfix);
|
|
} else {
|
|
if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
|
|
full_postfix = kstrdup(postfix, GFP_KERNEL);
|
|
else
|
|
full_postfix = kasprintf(GFP_KERNEL,
|
|
"%s_%s",
|
|
chan->extend_name,
|
|
postfix);
|
|
}
|
|
if (full_postfix == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (chan->differential) { /* Differential can not have modifier */
|
|
switch (shared_by) {
|
|
case IIO_SHARED_BY_ALL:
|
|
name = kasprintf(GFP_KERNEL, "%s", full_postfix);
|
|
break;
|
|
case IIO_SHARED_BY_DIR:
|
|
name = kasprintf(GFP_KERNEL, "%s_%s",
|
|
iio_direction[chan->output],
|
|
full_postfix);
|
|
break;
|
|
case IIO_SHARED_BY_TYPE:
|
|
name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
iio_chan_type_name_spec[chan->type],
|
|
full_postfix);
|
|
break;
|
|
case IIO_SEPARATE:
|
|
if (!chan->indexed) {
|
|
WARN(1, "Differential channels must be indexed\n");
|
|
ret = -EINVAL;
|
|
goto error_free_full_postfix;
|
|
}
|
|
name = kasprintf(GFP_KERNEL,
|
|
"%s_%s%d-%s%d_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
chan->channel,
|
|
iio_chan_type_name_spec[chan->type],
|
|
chan->channel2,
|
|
full_postfix);
|
|
break;
|
|
}
|
|
} else { /* Single ended */
|
|
switch (shared_by) {
|
|
case IIO_SHARED_BY_ALL:
|
|
name = kasprintf(GFP_KERNEL, "%s", full_postfix);
|
|
break;
|
|
case IIO_SHARED_BY_DIR:
|
|
name = kasprintf(GFP_KERNEL, "%s_%s",
|
|
iio_direction[chan->output],
|
|
full_postfix);
|
|
break;
|
|
case IIO_SHARED_BY_TYPE:
|
|
name = kasprintf(GFP_KERNEL, "%s_%s_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
full_postfix);
|
|
break;
|
|
|
|
case IIO_SEPARATE:
|
|
if (chan->indexed)
|
|
name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
chan->channel,
|
|
full_postfix);
|
|
else
|
|
name = kasprintf(GFP_KERNEL, "%s_%s_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
full_postfix);
|
|
break;
|
|
}
|
|
}
|
|
if (name == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_full_postfix;
|
|
}
|
|
dev_attr->attr.name = name;
|
|
|
|
if (readfunc) {
|
|
dev_attr->attr.mode |= S_IRUGO;
|
|
dev_attr->show = readfunc;
|
|
}
|
|
|
|
if (writefunc) {
|
|
dev_attr->attr.mode |= S_IWUSR;
|
|
dev_attr->store = writefunc;
|
|
}
|
|
|
|
error_free_full_postfix:
|
|
kfree(full_postfix);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
|
|
{
|
|
kfree(dev_attr->attr.name);
|
|
}
|
|
|
|
int __iio_add_chan_devattr(const char *postfix,
|
|
struct iio_chan_spec const *chan,
|
|
ssize_t (*readfunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf),
|
|
ssize_t (*writefunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len),
|
|
u64 mask,
|
|
enum iio_shared_by shared_by,
|
|
struct device *dev,
|
|
struct iio_buffer *buffer,
|
|
struct list_head *attr_list)
|
|
{
|
|
int ret;
|
|
struct iio_dev_attr *iio_attr, *t;
|
|
|
|
iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
|
|
if (iio_attr == NULL)
|
|
return -ENOMEM;
|
|
ret = __iio_device_attr_init(&iio_attr->dev_attr,
|
|
postfix, chan,
|
|
readfunc, writefunc, shared_by);
|
|
if (ret)
|
|
goto error_iio_dev_attr_free;
|
|
iio_attr->c = chan;
|
|
iio_attr->address = mask;
|
|
iio_attr->buffer = buffer;
|
|
list_for_each_entry(t, attr_list, l)
|
|
if (strcmp(t->dev_attr.attr.name,
|
|
iio_attr->dev_attr.attr.name) == 0) {
|
|
if (shared_by == IIO_SEPARATE)
|
|
dev_err(dev, "tried to double register : %s\n",
|
|
t->dev_attr.attr.name);
|
|
ret = -EBUSY;
|
|
goto error_device_attr_deinit;
|
|
}
|
|
list_add(&iio_attr->l, attr_list);
|
|
|
|
return 0;
|
|
|
|
error_device_attr_deinit:
|
|
__iio_device_attr_deinit(&iio_attr->dev_attr);
|
|
error_iio_dev_attr_free:
|
|
kfree(iio_attr);
|
|
return ret;
|
|
}
|
|
|
|
static int iio_device_add_channel_label(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
int ret;
|
|
|
|
if (!indio_dev->info->read_label)
|
|
return 0;
|
|
|
|
ret = __iio_add_chan_devattr("label",
|
|
chan,
|
|
&iio_read_channel_label,
|
|
NULL,
|
|
0,
|
|
IIO_SEPARATE,
|
|
&indio_dev->dev,
|
|
NULL,
|
|
&iio_dev_opaque->channel_attr_list);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
enum iio_shared_by shared_by,
|
|
const long *infomask)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
int i, ret, attrcount = 0;
|
|
|
|
for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
|
|
if (i >= ARRAY_SIZE(iio_chan_info_postfix))
|
|
return -EINVAL;
|
|
ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
|
|
chan,
|
|
&iio_read_channel_info,
|
|
&iio_write_channel_info,
|
|
i,
|
|
shared_by,
|
|
&indio_dev->dev,
|
|
NULL,
|
|
&iio_dev_opaque->channel_attr_list);
|
|
if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
|
|
continue;
|
|
else if (ret < 0)
|
|
return ret;
|
|
attrcount++;
|
|
}
|
|
|
|
return attrcount;
|
|
}
|
|
|
|
static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
enum iio_shared_by shared_by,
|
|
const long *infomask)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
int i, ret, attrcount = 0;
|
|
char *avail_postfix;
|
|
|
|
for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
|
|
if (i >= ARRAY_SIZE(iio_chan_info_postfix))
|
|
return -EINVAL;
|
|
avail_postfix = kasprintf(GFP_KERNEL,
|
|
"%s_available",
|
|
iio_chan_info_postfix[i]);
|
|
if (!avail_postfix)
|
|
return -ENOMEM;
|
|
|
|
ret = __iio_add_chan_devattr(avail_postfix,
|
|
chan,
|
|
&iio_read_channel_info_avail,
|
|
NULL,
|
|
i,
|
|
shared_by,
|
|
&indio_dev->dev,
|
|
NULL,
|
|
&iio_dev_opaque->channel_attr_list);
|
|
kfree(avail_postfix);
|
|
if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
|
|
continue;
|
|
else if (ret < 0)
|
|
return ret;
|
|
attrcount++;
|
|
}
|
|
|
|
return attrcount;
|
|
}
|
|
|
|
static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
int ret, attrcount = 0;
|
|
const struct iio_chan_spec_ext_info *ext_info;
|
|
|
|
if (chan->channel < 0)
|
|
return 0;
|
|
ret = iio_device_add_info_mask_type(indio_dev, chan,
|
|
IIO_SEPARATE,
|
|
&chan->info_mask_separate);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
|
|
IIO_SEPARATE,
|
|
&chan->
|
|
info_mask_separate_available);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
ret = iio_device_add_info_mask_type(indio_dev, chan,
|
|
IIO_SHARED_BY_TYPE,
|
|
&chan->info_mask_shared_by_type);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
|
|
IIO_SHARED_BY_TYPE,
|
|
&chan->
|
|
info_mask_shared_by_type_available);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
ret = iio_device_add_info_mask_type(indio_dev, chan,
|
|
IIO_SHARED_BY_DIR,
|
|
&chan->info_mask_shared_by_dir);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
|
|
IIO_SHARED_BY_DIR,
|
|
&chan->info_mask_shared_by_dir_available);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
ret = iio_device_add_info_mask_type(indio_dev, chan,
|
|
IIO_SHARED_BY_ALL,
|
|
&chan->info_mask_shared_by_all);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
ret = iio_device_add_info_mask_type_avail(indio_dev, chan,
|
|
IIO_SHARED_BY_ALL,
|
|
&chan->info_mask_shared_by_all_available);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
ret = iio_device_add_channel_label(indio_dev, chan);
|
|
if (ret < 0)
|
|
return ret;
|
|
attrcount += ret;
|
|
|
|
if (chan->ext_info) {
|
|
unsigned int i = 0;
|
|
for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
|
|
ret = __iio_add_chan_devattr(ext_info->name,
|
|
chan,
|
|
ext_info->read ?
|
|
&iio_read_channel_ext_info : NULL,
|
|
ext_info->write ?
|
|
&iio_write_channel_ext_info : NULL,
|
|
i,
|
|
ext_info->shared,
|
|
&indio_dev->dev,
|
|
NULL,
|
|
&iio_dev_opaque->channel_attr_list);
|
|
i++;
|
|
if (ret == -EBUSY && ext_info->shared)
|
|
continue;
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
attrcount++;
|
|
}
|
|
}
|
|
|
|
return attrcount;
|
|
}
|
|
|
|
/**
|
|
* iio_free_chan_devattr_list() - Free a list of IIO device attributes
|
|
* @attr_list: List of IIO device attributes
|
|
*
|
|
* This function frees the memory allocated for each of the IIO device
|
|
* attributes in the list.
|
|
*/
|
|
void iio_free_chan_devattr_list(struct list_head *attr_list)
|
|
{
|
|
struct iio_dev_attr *p, *n;
|
|
|
|
list_for_each_entry_safe(p, n, attr_list, l) {
|
|
kfree_const(p->dev_attr.attr.name);
|
|
list_del(&p->l);
|
|
kfree(p);
|
|
}
|
|
}
|
|
|
|
static ssize_t iio_show_dev_name(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
return sysfs_emit(buf, "%s\n", indio_dev->name);
|
|
}
|
|
|
|
static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
|
|
|
|
static ssize_t iio_show_dev_label(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
return sysfs_emit(buf, "%s\n", indio_dev->label);
|
|
}
|
|
|
|
static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
|
|
|
|
static ssize_t iio_show_timestamp_clock(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
const struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
const clockid_t clk = iio_device_get_clock(indio_dev);
|
|
const char *name;
|
|
ssize_t sz;
|
|
|
|
switch (clk) {
|
|
case CLOCK_REALTIME:
|
|
name = "realtime\n";
|
|
sz = sizeof("realtime\n");
|
|
break;
|
|
case CLOCK_MONOTONIC:
|
|
name = "monotonic\n";
|
|
sz = sizeof("monotonic\n");
|
|
break;
|
|
case CLOCK_MONOTONIC_RAW:
|
|
name = "monotonic_raw\n";
|
|
sz = sizeof("monotonic_raw\n");
|
|
break;
|
|
case CLOCK_REALTIME_COARSE:
|
|
name = "realtime_coarse\n";
|
|
sz = sizeof("realtime_coarse\n");
|
|
break;
|
|
case CLOCK_MONOTONIC_COARSE:
|
|
name = "monotonic_coarse\n";
|
|
sz = sizeof("monotonic_coarse\n");
|
|
break;
|
|
case CLOCK_BOOTTIME:
|
|
name = "boottime\n";
|
|
sz = sizeof("boottime\n");
|
|
break;
|
|
case CLOCK_TAI:
|
|
name = "tai\n";
|
|
sz = sizeof("tai\n");
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
memcpy(buf, name, sz);
|
|
return sz;
|
|
}
|
|
|
|
static ssize_t iio_store_timestamp_clock(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
clockid_t clk;
|
|
int ret;
|
|
|
|
if (sysfs_streq(buf, "realtime"))
|
|
clk = CLOCK_REALTIME;
|
|
else if (sysfs_streq(buf, "monotonic"))
|
|
clk = CLOCK_MONOTONIC;
|
|
else if (sysfs_streq(buf, "monotonic_raw"))
|
|
clk = CLOCK_MONOTONIC_RAW;
|
|
else if (sysfs_streq(buf, "realtime_coarse"))
|
|
clk = CLOCK_REALTIME_COARSE;
|
|
else if (sysfs_streq(buf, "monotonic_coarse"))
|
|
clk = CLOCK_MONOTONIC_COARSE;
|
|
else if (sysfs_streq(buf, "boottime"))
|
|
clk = CLOCK_BOOTTIME;
|
|
else if (sysfs_streq(buf, "tai"))
|
|
clk = CLOCK_TAI;
|
|
else
|
|
return -EINVAL;
|
|
|
|
ret = iio_device_set_clock(dev_to_iio_dev(dev), clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return len;
|
|
}
|
|
|
|
int iio_device_register_sysfs_group(struct iio_dev *indio_dev,
|
|
const struct attribute_group *group)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
const struct attribute_group **new, **old = iio_dev_opaque->groups;
|
|
unsigned int cnt = iio_dev_opaque->groupcounter;
|
|
|
|
new = krealloc(old, sizeof(*new) * (cnt + 2), GFP_KERNEL);
|
|
if (!new)
|
|
return -ENOMEM;
|
|
|
|
new[iio_dev_opaque->groupcounter++] = group;
|
|
new[iio_dev_opaque->groupcounter] = NULL;
|
|
|
|
iio_dev_opaque->groups = new;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
|
|
iio_show_timestamp_clock, iio_store_timestamp_clock);
|
|
|
|
static int iio_device_register_sysfs(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
|
|
struct iio_dev_attr *p;
|
|
struct attribute **attr, *clk = NULL;
|
|
|
|
/* First count elements in any existing group */
|
|
if (indio_dev->info->attrs) {
|
|
attr = indio_dev->info->attrs->attrs;
|
|
while (*attr++ != NULL)
|
|
attrcount_orig++;
|
|
}
|
|
attrcount = attrcount_orig;
|
|
/*
|
|
* New channel registration method - relies on the fact a group does
|
|
* not need to be initialized if its name is NULL.
|
|
*/
|
|
if (indio_dev->channels)
|
|
for (i = 0; i < indio_dev->num_channels; i++) {
|
|
const struct iio_chan_spec *chan =
|
|
&indio_dev->channels[i];
|
|
|
|
if (chan->type == IIO_TIMESTAMP)
|
|
clk = &dev_attr_current_timestamp_clock.attr;
|
|
|
|
ret = iio_device_add_channel_sysfs(indio_dev, chan);
|
|
if (ret < 0)
|
|
goto error_clear_attrs;
|
|
attrcount += ret;
|
|
}
|
|
|
|
if (iio_dev_opaque->event_interface)
|
|
clk = &dev_attr_current_timestamp_clock.attr;
|
|
|
|
if (indio_dev->name)
|
|
attrcount++;
|
|
if (indio_dev->label)
|
|
attrcount++;
|
|
if (clk)
|
|
attrcount++;
|
|
|
|
iio_dev_opaque->chan_attr_group.attrs =
|
|
kcalloc(attrcount + 1,
|
|
sizeof(iio_dev_opaque->chan_attr_group.attrs[0]),
|
|
GFP_KERNEL);
|
|
if (iio_dev_opaque->chan_attr_group.attrs == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_clear_attrs;
|
|
}
|
|
/* Copy across original attributes */
|
|
if (indio_dev->info->attrs) {
|
|
memcpy(iio_dev_opaque->chan_attr_group.attrs,
|
|
indio_dev->info->attrs->attrs,
|
|
sizeof(iio_dev_opaque->chan_attr_group.attrs[0])
|
|
*attrcount_orig);
|
|
iio_dev_opaque->chan_attr_group.is_visible =
|
|
indio_dev->info->attrs->is_visible;
|
|
}
|
|
attrn = attrcount_orig;
|
|
/* Add all elements from the list. */
|
|
list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l)
|
|
iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
|
|
if (indio_dev->name)
|
|
iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
|
|
if (indio_dev->label)
|
|
iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
|
|
if (clk)
|
|
iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk;
|
|
|
|
ret = iio_device_register_sysfs_group(indio_dev,
|
|
&iio_dev_opaque->chan_attr_group);
|
|
if (ret)
|
|
goto error_clear_attrs;
|
|
|
|
return 0;
|
|
|
|
error_clear_attrs:
|
|
iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
|
|
iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
|
|
kfree(iio_dev_opaque->chan_attr_group.attrs);
|
|
iio_dev_opaque->chan_attr_group.attrs = NULL;
|
|
kfree(iio_dev_opaque->groups);
|
|
}
|
|
|
|
static void iio_dev_release(struct device *device)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(device);
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
|
|
if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
|
|
iio_device_unregister_trigger_consumer(indio_dev);
|
|
iio_device_unregister_eventset(indio_dev);
|
|
iio_device_unregister_sysfs(indio_dev);
|
|
|
|
iio_device_detach_buffers(indio_dev);
|
|
|
|
ida_simple_remove(&iio_ida, iio_dev_opaque->id);
|
|
kfree(iio_dev_opaque);
|
|
}
|
|
|
|
struct device_type iio_device_type = {
|
|
.name = "iio_device",
|
|
.release = iio_dev_release,
|
|
};
|
|
|
|
/**
|
|
* iio_device_alloc() - allocate an iio_dev from a driver
|
|
* @parent: Parent device.
|
|
* @sizeof_priv: Space to allocate for private structure.
|
|
**/
|
|
struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque;
|
|
struct iio_dev *indio_dev;
|
|
size_t alloc_size;
|
|
|
|
alloc_size = sizeof(struct iio_dev_opaque);
|
|
if (sizeof_priv) {
|
|
alloc_size = ALIGN(alloc_size, IIO_ALIGN);
|
|
alloc_size += sizeof_priv;
|
|
}
|
|
|
|
iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
|
|
if (!iio_dev_opaque)
|
|
return NULL;
|
|
|
|
indio_dev = &iio_dev_opaque->indio_dev;
|
|
indio_dev->priv = (char *)iio_dev_opaque +
|
|
ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN);
|
|
|
|
indio_dev->dev.parent = parent;
|
|
indio_dev->dev.type = &iio_device_type;
|
|
indio_dev->dev.bus = &iio_bus_type;
|
|
device_initialize(&indio_dev->dev);
|
|
iio_device_set_drvdata(indio_dev, (void *)indio_dev);
|
|
mutex_init(&indio_dev->mlock);
|
|
mutex_init(&iio_dev_opaque->info_exist_lock);
|
|
INIT_LIST_HEAD(&iio_dev_opaque->channel_attr_list);
|
|
|
|
iio_dev_opaque->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
|
|
if (iio_dev_opaque->id < 0) {
|
|
/* cannot use a dev_err as the name isn't available */
|
|
pr_err("failed to get device id\n");
|
|
kfree(iio_dev_opaque);
|
|
return NULL;
|
|
}
|
|
dev_set_name(&indio_dev->dev, "iio:device%d", iio_dev_opaque->id);
|
|
INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
|
|
INIT_LIST_HEAD(&iio_dev_opaque->ioctl_handlers);
|
|
|
|
return indio_dev;
|
|
}
|
|
EXPORT_SYMBOL(iio_device_alloc);
|
|
|
|
/**
|
|
* iio_device_free() - free an iio_dev from a driver
|
|
* @dev: the iio_dev associated with the device
|
|
**/
|
|
void iio_device_free(struct iio_dev *dev)
|
|
{
|
|
if (dev)
|
|
put_device(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(iio_device_free);
|
|
|
|
static void devm_iio_device_release(void *iio_dev)
|
|
{
|
|
iio_device_free(iio_dev);
|
|
}
|
|
|
|
/**
|
|
* devm_iio_device_alloc - Resource-managed iio_device_alloc()
|
|
* @parent: Device to allocate iio_dev for, and parent for this IIO device
|
|
* @sizeof_priv: Space to allocate for private structure.
|
|
*
|
|
* Managed iio_device_alloc. iio_dev allocated with this function is
|
|
* automatically freed on driver detach.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to allocated iio_dev on success, NULL on failure.
|
|
*/
|
|
struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv)
|
|
{
|
|
struct iio_dev *iio_dev;
|
|
int ret;
|
|
|
|
iio_dev = iio_device_alloc(parent, sizeof_priv);
|
|
if (!iio_dev)
|
|
return NULL;
|
|
|
|
ret = devm_add_action_or_reset(parent, devm_iio_device_release,
|
|
iio_dev);
|
|
if (ret)
|
|
return NULL;
|
|
|
|
return iio_dev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
|
|
|
|
/**
|
|
* iio_chrdev_open() - chrdev file open for buffer access and ioctls
|
|
* @inode: Inode structure for identifying the device in the file system
|
|
* @filp: File structure for iio device used to keep and later access
|
|
* private data
|
|
*
|
|
* Return: 0 on success or -EBUSY if the device is already opened
|
|
**/
|
|
static int iio_chrdev_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque =
|
|
container_of(inode->i_cdev, struct iio_dev_opaque, chrdev);
|
|
struct iio_dev *indio_dev = &iio_dev_opaque->indio_dev;
|
|
struct iio_dev_buffer_pair *ib;
|
|
|
|
if (test_and_set_bit(IIO_BUSY_BIT_POS, &iio_dev_opaque->flags))
|
|
return -EBUSY;
|
|
|
|
iio_device_get(indio_dev);
|
|
|
|
ib = kmalloc(sizeof(*ib), GFP_KERNEL);
|
|
if (!ib) {
|
|
iio_device_put(indio_dev);
|
|
clear_bit(IIO_BUSY_BIT_POS, &iio_dev_opaque->flags);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ib->indio_dev = indio_dev;
|
|
ib->buffer = indio_dev->buffer;
|
|
|
|
filp->private_data = ib;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iio_chrdev_release() - chrdev file close buffer access and ioctls
|
|
* @inode: Inode structure pointer for the char device
|
|
* @filp: File structure pointer for the char device
|
|
*
|
|
* Return: 0 for successful release
|
|
*/
|
|
static int iio_chrdev_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct iio_dev_buffer_pair *ib = filp->private_data;
|
|
struct iio_dev_opaque *iio_dev_opaque =
|
|
container_of(inode->i_cdev, struct iio_dev_opaque, chrdev);
|
|
struct iio_dev *indio_dev = &iio_dev_opaque->indio_dev;
|
|
kfree(ib);
|
|
clear_bit(IIO_BUSY_BIT_POS, &iio_dev_opaque->flags);
|
|
iio_device_put(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
|
|
struct iio_ioctl_handler *h)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
|
|
list_add_tail(&h->entry, &iio_dev_opaque->ioctl_handlers);
|
|
}
|
|
|
|
void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h)
|
|
{
|
|
list_del(&h->entry);
|
|
}
|
|
|
|
static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct iio_dev_buffer_pair *ib = filp->private_data;
|
|
struct iio_dev *indio_dev = ib->indio_dev;
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
struct iio_ioctl_handler *h;
|
|
int ret = -ENODEV;
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
/**
|
|
* The NULL check here is required to prevent crashing when a device
|
|
* is being removed while userspace would still have open file handles
|
|
* to try to access this device.
|
|
*/
|
|
if (!indio_dev->info)
|
|
goto out_unlock;
|
|
|
|
list_for_each_entry(h, &iio_dev_opaque->ioctl_handlers, entry) {
|
|
ret = h->ioctl(indio_dev, filp, cmd, arg);
|
|
if (ret != IIO_IOCTL_UNHANDLED)
|
|
break;
|
|
}
|
|
|
|
if (ret == IIO_IOCTL_UNHANDLED)
|
|
ret = -ENODEV;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations iio_buffer_fileops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = noop_llseek,
|
|
.read = iio_buffer_read_outer_addr,
|
|
.poll = iio_buffer_poll_addr,
|
|
.unlocked_ioctl = iio_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.open = iio_chrdev_open,
|
|
.release = iio_chrdev_release,
|
|
};
|
|
|
|
static const struct file_operations iio_event_fileops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = noop_llseek,
|
|
.unlocked_ioctl = iio_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.open = iio_chrdev_open,
|
|
.release = iio_chrdev_release,
|
|
};
|
|
|
|
static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
|
|
{
|
|
int i, j;
|
|
const struct iio_chan_spec *channels = indio_dev->channels;
|
|
|
|
if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES))
|
|
return 0;
|
|
|
|
for (i = 0; i < indio_dev->num_channels - 1; i++) {
|
|
if (channels[i].scan_index < 0)
|
|
continue;
|
|
for (j = i + 1; j < indio_dev->num_channels; j++)
|
|
if (channels[i].scan_index == channels[j].scan_index) {
|
|
dev_err(&indio_dev->dev,
|
|
"Duplicate scan index %d\n",
|
|
channels[i].scan_index);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iio_buffer_setup_ops noop_ring_setup_ops;
|
|
|
|
int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
const char *label;
|
|
int ret;
|
|
|
|
if (!indio_dev->info)
|
|
return -EINVAL;
|
|
|
|
iio_dev_opaque->driver_module = this_mod;
|
|
/* If the calling driver did not initialize of_node, do it here */
|
|
if (!indio_dev->dev.of_node && indio_dev->dev.parent)
|
|
indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
|
|
|
|
label = of_get_property(indio_dev->dev.of_node, "label", NULL);
|
|
if (label)
|
|
indio_dev->label = label;
|
|
|
|
ret = iio_check_unique_scan_index(indio_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
iio_device_register_debugfs(indio_dev);
|
|
|
|
ret = iio_buffers_alloc_sysfs_and_mask(indio_dev);
|
|
if (ret) {
|
|
dev_err(indio_dev->dev.parent,
|
|
"Failed to create buffer sysfs interfaces\n");
|
|
goto error_unreg_debugfs;
|
|
}
|
|
|
|
ret = iio_device_register_sysfs(indio_dev);
|
|
if (ret) {
|
|
dev_err(indio_dev->dev.parent,
|
|
"Failed to register sysfs interfaces\n");
|
|
goto error_buffer_free_sysfs;
|
|
}
|
|
ret = iio_device_register_eventset(indio_dev);
|
|
if (ret) {
|
|
dev_err(indio_dev->dev.parent,
|
|
"Failed to register event set\n");
|
|
goto error_free_sysfs;
|
|
}
|
|
if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
|
|
iio_device_register_trigger_consumer(indio_dev);
|
|
|
|
if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
|
|
indio_dev->setup_ops == NULL)
|
|
indio_dev->setup_ops = &noop_ring_setup_ops;
|
|
|
|
if (iio_dev_opaque->attached_buffers_cnt)
|
|
cdev_init(&iio_dev_opaque->chrdev, &iio_buffer_fileops);
|
|
else if (iio_dev_opaque->event_interface)
|
|
cdev_init(&iio_dev_opaque->chrdev, &iio_event_fileops);
|
|
|
|
if (iio_dev_opaque->attached_buffers_cnt || iio_dev_opaque->event_interface) {
|
|
indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), iio_dev_opaque->id);
|
|
iio_dev_opaque->chrdev.owner = this_mod;
|
|
}
|
|
|
|
/* assign device groups now; they should be all registered now */
|
|
indio_dev->dev.groups = iio_dev_opaque->groups;
|
|
|
|
ret = cdev_device_add(&iio_dev_opaque->chrdev, &indio_dev->dev);
|
|
if (ret < 0)
|
|
goto error_unreg_eventset;
|
|
|
|
return 0;
|
|
|
|
error_unreg_eventset:
|
|
iio_device_unregister_eventset(indio_dev);
|
|
error_free_sysfs:
|
|
iio_device_unregister_sysfs(indio_dev);
|
|
error_buffer_free_sysfs:
|
|
iio_buffers_free_sysfs_and_mask(indio_dev);
|
|
error_unreg_debugfs:
|
|
iio_device_unregister_debugfs(indio_dev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(__iio_device_register);
|
|
|
|
/**
|
|
* iio_device_unregister() - unregister a device from the IIO subsystem
|
|
* @indio_dev: Device structure representing the device.
|
|
**/
|
|
void iio_device_unregister(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
|
|
cdev_device_del(&iio_dev_opaque->chrdev, &indio_dev->dev);
|
|
|
|
mutex_lock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
iio_device_unregister_debugfs(indio_dev);
|
|
|
|
iio_disable_all_buffers(indio_dev);
|
|
|
|
indio_dev->info = NULL;
|
|
|
|
iio_device_wakeup_eventset(indio_dev);
|
|
iio_buffer_wakeup_poll(indio_dev);
|
|
|
|
mutex_unlock(&iio_dev_opaque->info_exist_lock);
|
|
|
|
iio_buffers_free_sysfs_and_mask(indio_dev);
|
|
}
|
|
EXPORT_SYMBOL(iio_device_unregister);
|
|
|
|
static void devm_iio_device_unreg(void *indio_dev)
|
|
{
|
|
iio_device_unregister(indio_dev);
|
|
}
|
|
|
|
int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
|
|
struct module *this_mod)
|
|
{
|
|
int ret;
|
|
|
|
ret = __iio_device_register(indio_dev, this_mod);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return devm_add_action_or_reset(dev, devm_iio_device_unreg, indio_dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__devm_iio_device_register);
|
|
|
|
/**
|
|
* iio_device_claim_direct_mode - Keep device in direct mode
|
|
* @indio_dev: the iio_dev associated with the device
|
|
*
|
|
* If the device is in direct mode it is guaranteed to stay
|
|
* that way until iio_device_release_direct_mode() is called.
|
|
*
|
|
* Use with iio_device_release_direct_mode()
|
|
*
|
|
* Returns: 0 on success, -EBUSY on failure
|
|
*/
|
|
int iio_device_claim_direct_mode(struct iio_dev *indio_dev)
|
|
{
|
|
mutex_lock(&indio_dev->mlock);
|
|
|
|
if (iio_buffer_enabled(indio_dev)) {
|
|
mutex_unlock(&indio_dev->mlock);
|
|
return -EBUSY;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode);
|
|
|
|
/**
|
|
* iio_device_release_direct_mode - releases claim on direct mode
|
|
* @indio_dev: the iio_dev associated with the device
|
|
*
|
|
* Release the claim. Device is no longer guaranteed to stay
|
|
* in direct mode.
|
|
*
|
|
* Use with iio_device_claim_direct_mode()
|
|
*/
|
|
void iio_device_release_direct_mode(struct iio_dev *indio_dev)
|
|
{
|
|
mutex_unlock(&indio_dev->mlock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_device_release_direct_mode);
|
|
|
|
subsys_initcall(iio_init);
|
|
module_exit(iio_exit);
|
|
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
|
|
MODULE_DESCRIPTION("Industrial I/O core");
|
|
MODULE_LICENSE("GPL");
|