industrialio-core.c 46 KB
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/* The industrial I/O core
 *
 * Copyright (c) 2008 Jonathan Cameron
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * Based on elements of hwmon and input subsystems.
 */

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#define pr_fmt(fmt) "iio-core: " fmt

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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/idr.h>
#include <linux/kdev_t.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/poll.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 "iio_core.h"
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#include "iio_core_trigger.h"
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#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/buffer_impl.h>
36

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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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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[] = {
	[0] = "in",
	[1] = "out",
};

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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",
	[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",
	[IIO_INTENSITY] = "intensity",
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	[IIO_PROXIMITY] = "proximity",
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	[IIO_TEMP] = "temp",
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	[IIO_INCLI] = "incli",
	[IIO_ROT] = "rot",
	[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",
	[IIO_INDEX] = "index",
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	[IIO_GRAVITY]  = "gravity",
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};

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static const char * const iio_modifier_names[] = {
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	[IIO_MOD_X] = "x",
	[IIO_MOD_Y] = "y",
	[IIO_MOD_Z] = "z",
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	[IIO_MOD_X_AND_Y] = "x&y",
	[IIO_MOD_X_AND_Z] = "x&z",
	[IIO_MOD_Y_AND_Z] = "y&z",
	[IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
	[IIO_MOD_X_OR_Y] = "x|y",
	[IIO_MOD_X_OR_Z] = "x|z",
	[IIO_MOD_Y_OR_Z] = "y|z",
	[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",
	[IIO_MOD_LIGHT_IR] = "ir",
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	[IIO_MOD_LIGHT_CLEAR] = "clear",
	[IIO_MOD_LIGHT_RED] = "red",
	[IIO_MOD_LIGHT_GREEN] = "green",
	[IIO_MOD_LIGHT_BLUE] = "blue",
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	[IIO_MOD_LIGHT_UV] = "uv",
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	[IIO_MOD_QUATERNION] = "quaternion",
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	[IIO_MOD_TEMP_AMBIENT] = "ambient",
	[IIO_MOD_TEMP_OBJECT] = "object",
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	[IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
	[IIO_MOD_NORTH_TRUE] = "from_north_true",
	[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
	[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
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	[IIO_MOD_RUNNING] = "running",
	[IIO_MOD_JOGGING] = "jogging",
	[IIO_MOD_WALKING] = "walking",
	[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",
	[IIO_MOD_Q] = "q",
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	[IIO_MOD_CO2] = "co2",
	[IIO_MOD_VOC] = "voc",
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};

/* relies on pairs of these shared then separate */
static const char * const iio_chan_info_postfix[] = {
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	[IIO_CHAN_INFO_RAW] = "raw",
	[IIO_CHAN_INFO_PROCESSED] = "input",
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	[IIO_CHAN_INFO_SCALE] = "scale",
	[IIO_CHAN_INFO_OFFSET] = "offset",
	[IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
	[IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
	[IIO_CHAN_INFO_PEAK] = "peak_raw",
	[IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
	[IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
	[IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
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	[IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
	= "filter_low_pass_3db_frequency",
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	[IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
	= "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",
	[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_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",
	[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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};

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/**
 * iio_find_channel_from_si() - get channel from its scan index
 * @indio_dev:		device
 * @si:			scan index to match
 */
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const struct iio_chan_spec
*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
{
	int i;

	for (i = 0; i < indio_dev->num_channels; i++)
		if (indio_dev->channels[i].scan_index == si)
			return &indio_dev->channels[i];
	return NULL;
}

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/* This turns up an awful lot */
ssize_t iio_read_const_attr(struct device *dev,
			    struct device_attribute *attr,
			    char *buf)
{
	return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
}
EXPORT_SYMBOL(iio_read_const_attr);

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static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
{
	int ret;
	const struct iio_event_interface *ev_int = indio_dev->event_interface;

	ret = mutex_lock_interruptible(&indio_dev->mlock);
	if (ret)
		return ret;
	if ((ev_int && iio_event_enabled(ev_int)) ||
	    iio_buffer_enabled(indio_dev)) {
		mutex_unlock(&indio_dev->mlock);
		return -EBUSY;
	}
	indio_dev->clock_id = clock_id;
	mutex_unlock(&indio_dev->mlock);

	return 0;
}

/**
 * iio_get_time_ns() - utility function to get a time stamp for events etc
 * @indio_dev: device
 */
s64 iio_get_time_ns(const struct iio_dev *indio_dev)
{
	struct timespec tp;

	switch (iio_device_get_clock(indio_dev)) {
	case CLOCK_REALTIME:
		ktime_get_real_ts(&tp);
		break;
	case CLOCK_MONOTONIC:
		ktime_get_ts(&tp);
		break;
	case CLOCK_MONOTONIC_RAW:
		getrawmonotonic(&tp);
		break;
	case CLOCK_REALTIME_COARSE:
		tp = current_kernel_time();
		break;
	case CLOCK_MONOTONIC_COARSE:
		tp = get_monotonic_coarse();
		break;
	case CLOCK_BOOTTIME:
		get_monotonic_boottime(&tp);
		break;
	case CLOCK_TAI:
		timekeeping_clocktai(&tp);
		break;
	default:
		BUG();
	}

	return timespec_to_ns(&tp);
}
EXPORT_SYMBOL(iio_get_time_ns);

/**
 * iio_get_time_res() - utility function to get time stamp clock resolution in
 *                      nano seconds.
 * @indio_dev: device
 */
unsigned int iio_get_time_res(const struct iio_dev *indio_dev)
{
	switch (iio_device_get_clock(indio_dev)) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_MONOTONIC_RAW:
	case CLOCK_BOOTTIME:
	case CLOCK_TAI:
		return hrtimer_resolution;
	case CLOCK_REALTIME_COARSE:
	case CLOCK_MONOTONIC_COARSE:
		return LOW_RES_NSEC;
	default:
		BUG();
	}
}
EXPORT_SYMBOL(iio_get_time_res);

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static int __init iio_init(void)
{
	int ret;

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	/* Register sysfs bus */
	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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	ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
	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:
	bus_unregister(&iio_bus_type);
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error_nothing:
	return ret;
}

static void __exit iio_exit(void)
{
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	if (iio_devt)
		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);
}

#if defined(CONFIG_DEBUG_FS)
static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
			      size_t count, loff_t *ppos)
{
	struct iio_dev *indio_dev = file->private_data;
	char buf[20];
	unsigned val = 0;
	ssize_t len;
	int ret;

	ret = indio_dev->info->debugfs_reg_access(indio_dev,
						  indio_dev->cached_reg_addr,
						  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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	len = snprintf(buf, sizeof(buf), "0x%X\n", val);

	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}

static ssize_t iio_debugfs_write_reg(struct file *file,
		     const char __user *userbuf, size_t count, loff_t *ppos)
{
	struct iio_dev *indio_dev = file->private_data;
	unsigned reg, val;
	char buf[80];
	int ret;

	count = min_t(size_t, count, (sizeof(buf)-1));
	if (copy_from_user(buf, userbuf, count))
		return -EFAULT;

	buf[count] = 0;

	ret = sscanf(buf, "%i %i", &reg, &val);

	switch (ret) {
	case 1:
		indio_dev->cached_reg_addr = reg;
		break;
	case 2:
		indio_dev->cached_reg_addr = reg;
		ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
							  val, NULL);
		if (ret) {
			dev_err(indio_dev->dev.parent, "%s: write failed\n",
				__func__);
			return ret;
		}
		break;
	default:
		return -EINVAL;
	}

	return count;
}

static const struct file_operations iio_debugfs_reg_fops = {
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	.open = simple_open,
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	.read = iio_debugfs_read_reg,
	.write = iio_debugfs_write_reg,
};

static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
{
	debugfs_remove_recursive(indio_dev->debugfs_dentry);
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}

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static int iio_device_register_debugfs(struct iio_dev *indio_dev)
{
	struct dentry *d;

	if (indio_dev->info->debugfs_reg_access == NULL)
		return 0;

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	if (!iio_debugfs_dentry)
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		return 0;

	indio_dev->debugfs_dentry =
		debugfs_create_dir(dev_name(&indio_dev->dev),
				   iio_debugfs_dentry);
	if (indio_dev->debugfs_dentry == NULL) {
		dev_warn(indio_dev->dev.parent,
			 "Failed to create debugfs directory\n");
		return -EFAULT;
	}

	d = debugfs_create_file("direct_reg_access", 0644,
				indio_dev->debugfs_dentry,
				indio_dev, &iio_debugfs_reg_fops);
	if (!d) {
		iio_device_unregister_debugfs(indio_dev);
		return -ENOMEM;
	}

	return 0;
}
#else
static int iio_device_register_debugfs(struct iio_dev *indio_dev)
{
	return 0;
}

static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
{
}
#endif /* CONFIG_DEBUG_FS */

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static ssize_t iio_read_channel_ext_info(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
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	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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	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];

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	return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
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}

static ssize_t iio_write_channel_ext_info(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf,
					 size_t len)
{
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	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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	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];

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	return ext_info->write(indio_dev, ext_info->private,
			       this_attr->c, buf, len);
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}

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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)
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		len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
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	/* 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)
		return -EINVAL;

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	return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]);
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}
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;

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	ret = __sysfs_match_string(e->items, e->num_items, buf);
	if (ret < 0)
		return ret;
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	ret = e->set(indio_dev, chan, ret);
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	return ret ? ret : len;
}
EXPORT_SYMBOL_GPL(iio_enum_write);

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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 snprintf(buf, PAGE_SIZE, "%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);

/**
 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
 *                              device-tree "mount-matrix" property
 * @dev:	device the mounting matrix property is assigned to
 * @propname:	device specific mounting matrix property name
 * @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.
 */
#ifdef CONFIG_OF
int of_iio_read_mount_matrix(const struct device *dev,
			     const char *propname,
			     struct iio_mount_matrix *matrix)
{
	if (dev->of_node) {
		int err = of_property_read_string_array(dev->of_node,
				propname, matrix->rotation,
				ARRAY_SIZE(iio_mount_idmatrix.rotation));

		if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
			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);
}
#else
int of_iio_read_mount_matrix(const struct device *dev,
			     const char *propname,
			     struct iio_mount_matrix *matrix)
{
	return iio_setup_mount_idmatrix(dev, matrix);
}
#endif
EXPORT_SYMBOL(of_iio_read_mount_matrix);

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static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
				  int size, const int *vals)
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{
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	unsigned long long tmp;
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	int tmp0, tmp1;
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	bool scale_db = false;
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	switch (type) {
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	case IIO_VAL_INT:
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		return snprintf(buf, len, "%d", vals[0]);
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	case IIO_VAL_INT_PLUS_MICRO_DB:
		scale_db = true;
	case IIO_VAL_INT_PLUS_MICRO:
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		if (vals[1] < 0)
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			return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
					-vals[1], scale_db ? " dB" : "");
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		else
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			return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
					scale_db ? " dB" : "");
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	case IIO_VAL_INT_PLUS_NANO:
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		if (vals[1] < 0)
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			return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
					-vals[1]);
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		else
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			return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
604
	case IIO_VAL_FRACTIONAL:
605
		tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
606 607 608
		tmp1 = vals[1];
		tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
		return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
609
	case IIO_VAL_FRACTIONAL_LOG2:
610 611 612
		tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
		tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
		return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
613 614 615
	case IIO_VAL_INT_MULTIPLE:
	{
		int i;
616
		int l = 0;
617

618 619 620 621 622 623
		for (i = 0; i < size; ++i) {
			l += snprintf(&buf[l], len - l, "%d ", vals[i]);
			if (l >= len)
				break;
		}
		return l;
624
	}
625
	default:
626
		return 0;
627
	}
628
}
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653

/**
 * 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, PAGE_SIZE, type, size, vals);
	if (len >= PAGE_SIZE - 1)
		return -EFBIG;

	return len + sprintf(buf + len, "\n");
}
654
EXPORT_SYMBOL_GPL(iio_format_value);
655

656 657 658 659 660 661
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);
662 663 664 665 666 667 668 669 670 671 672 673
	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);
674 675 676 677

	if (ret < 0)
		return ret;

678
	return iio_format_value(buf, ret, val_len, vals);
679 680
}

681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
static ssize_t iio_format_avail_list(char *buf, const int *vals,
				     int type, int length)
{
	int i;
	ssize_t len = 0;

	switch (type) {
	case IIO_VAL_INT:
		for (i = 0; i < length; i++) {
			len += __iio_format_value(buf + len, PAGE_SIZE - len,
						  type, 1, &vals[i]);
			if (len >= PAGE_SIZE)
				return -EFBIG;
			if (i < length - 1)
				len += snprintf(buf + len, PAGE_SIZE - len,
						" ");
			else
				len += snprintf(buf + len, PAGE_SIZE - len,
						"\n");
			if (len >= PAGE_SIZE)
				return -EFBIG;
		}
		break;
	default:
		for (i = 0; i < length / 2; i++) {
			len += __iio_format_value(buf + len, PAGE_SIZE - len,
						  type, 2, &vals[i * 2]);
			if (len >= PAGE_SIZE)
				return -EFBIG;
			if (i < length / 2 - 1)
				len += snprintf(buf + len, PAGE_SIZE - len,
						" ");
			else
				len += snprintf(buf + len, PAGE_SIZE - len,
						"\n");
			if (len >= PAGE_SIZE)
				return -EFBIG;
		}
	}

	return len;
}

static ssize_t iio_format_avail_range(char *buf, const int *vals, int type)
{
	int i;
	ssize_t len;

	len = snprintf(buf, PAGE_SIZE, "[");
	switch (type) {
	case IIO_VAL_INT:
		for (i = 0; i < 3; i++) {
			len += __iio_format_value(buf + len, PAGE_SIZE - len,
						  type, 1, &vals[i]);
			if (len >= PAGE_SIZE)
				return -EFBIG;
			if (i < 2)
				len += snprintf(buf + len, PAGE_SIZE - len,
						" ");
			else
				len += snprintf(buf + len, PAGE_SIZE - len,
						"]\n");
			if (len >= PAGE_SIZE)
				return -EFBIG;
		}
		break;
	default:
		for (i = 0; i < 3; i++) {
			len += __iio_format_value(buf + len, PAGE_SIZE - len,
						  type, 2, &vals[i * 2]);
			if (len >= PAGE_SIZE)
				return -EFBIG;
			if (i < 2)
				len += snprintf(buf + len, PAGE_SIZE - len,
						" ");
			else
				len += snprintf(buf + len, PAGE_SIZE - len,
						"]\n");
			if (len >= PAGE_SIZE)
				return -EFBIG;
		}
	}

	return len;
}

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;
	}
}

794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
/**
 * 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)
{
	int i = 0, f = 0;
	bool integer_part = true, negative = false;

810 811 812 813 814 815
	if (fract_mult == 0) {
		*fract = 0;

		return kstrtoint(str, 0, integer);
	}

816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
	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 (*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;
}
EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);

858 859 860 861 862
static ssize_t iio_write_channel_info(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf,
				      size_t len)
{
863
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
864
	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
865 866
	int ret, fract_mult = 100000;
	int integer, fract;
867 868

	/* Assumes decimal - precision based on number of digits */
869
	if (!indio_dev->info->write_raw)
870
		return -EINVAL;
871 872 873 874

	if (indio_dev->info->write_raw_get_fmt)
		switch (indio_dev->info->write_raw_get_fmt(indio_dev,
			this_attr->c, this_attr->address)) {
875 876 877
		case IIO_VAL_INT:
			fract_mult = 0;
			break;
878 879 880 881 882 883 884 885 886 887
		case IIO_VAL_INT_PLUS_MICRO:
			fract_mult = 100000;
			break;
		case IIO_VAL_INT_PLUS_NANO:
			fract_mult = 100000000;
			break;
		default:
			return -EINVAL;
		}

888 889 890
	ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
	if (ret)
		return ret;
891

892
	ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
893
					 integer, fract, this_attr->address);
894 895 896 897 898 899
	if (ret)
		return ret;

	return len;
}

900
static
901 902 903 904 905 906 907 908 909 910
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),
911
			   enum iio_shared_by shared_by)
912
{
913
	int ret = 0;
914
	char *name = NULL;
915
	char *full_postfix;
916 917
	sysfs_attr_init(&dev_attr->attr);

918
	/* Build up postfix of <extend_name>_<modifier>_postfix */
919
	if (chan->modified && (shared_by == IIO_SEPARATE)) {
920 921 922 923 924 925 926 927 928 929 930 931
		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 {
932
		if (chan->extend_name == NULL || shared_by != IIO_SEPARATE)
933 934 935 936 937 938 939
			full_postfix = kstrdup(postfix, GFP_KERNEL);
		else
			full_postfix = kasprintf(GFP_KERNEL,
						 "%s_%s",
						 chan->extend_name,
						 postfix);
	}
940 941
	if (full_postfix == NULL)
		return -ENOMEM;
942

943
	if (chan->differential) { /* Differential can not have modifier */
944
		switch (shared_by) {
945
		case IIO_SHARED_BY_ALL:
946
			name = kasprintf(GFP_KERNEL, "%s", full_postfix);
947 948
			break;
		case IIO_SHARED_BY_DIR:
949
			name = kasprintf(GFP_KERNEL, "%s_%s",
950 951 952
						iio_direction[chan->output],
						full_postfix);
			break;
953
		case IIO_SHARED_BY_TYPE:
954
			name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
955 956 957 958
					    iio_direction[chan->output],
					    iio_chan_type_name_spec[chan->type],
					    iio_chan_type_name_spec[chan->type],
					    full_postfix);
959 960 961
			break;
		case IIO_SEPARATE:
			if (!chan->indexed) {
962
				WARN(1, "Differential channels must be indexed\n");
963 964 965
				ret = -EINVAL;
				goto error_free_full_postfix;
			}
966
			name = kasprintf(GFP_KERNEL,
967
					    "%s_%s%d-%s%d_%s",
968 969 970 971 972 973
					    iio_direction[chan->output],
					    iio_chan_type_name_spec[chan->type],
					    chan->channel,
					    iio_chan_type_name_spec[chan->type],
					    chan->channel2,
					    full_postfix);
974
			break;
975 976
		}
	} else { /* Single ended */
977
		switch (shared_by) {
978
		case IIO_SHARED_BY_ALL:
979
			name = kasprintf(GFP_KERNEL, "%s", full_postfix);
980 981
			break;
		case IIO_SHARED_BY_DIR:
982
			name = kasprintf(GFP_KERNEL, "%s_%s",
983 984 985
						iio_direction[chan->output],
						full_postfix);
			break;
986
		case IIO_SHARED_BY_TYPE:
987
			name = kasprintf(GFP_KERNEL, "%s_%s_%s",
988 989 990
					    iio_direction[chan->output],
					    iio_chan_type_name_spec[chan->type],
					    full_postfix);
991 992 993 994
			break;

		case IIO_SEPARATE:
			if (chan->indexed)
995
				name = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
996 997 998 999 1000
						    iio_direction[chan->output],
						    iio_chan_type_name_spec[chan->type],
						    chan->channel,
						    full_postfix);
			else
1001
				name = kasprintf(GFP_KERNEL, "%s_%s_%s",
1002 1003 1004 1005 1006
						    iio_direction[chan->output],
						    iio_chan_type_name_spec[chan->type],
						    full_postfix);
			break;
		}
1007
	}
1008
	if (name == NULL) {
1009 1010 1011
		ret = -ENOMEM;
		goto error_free_full_postfix;
	}
1012
	dev_attr->attr.name = name;
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022

	if (readfunc) {
		dev_attr->attr.mode |= S_IRUGO;
		dev_attr->show = readfunc;
	}

	if (writefunc) {
		dev_attr->attr.mode |= S_IWUSR;
		dev_attr->store = writefunc;
	}
1023

1024 1025
error_free_full_postfix:
	kfree(full_postfix);
1026

1027 1028 1029
	return ret;
}

1030
static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
{
	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),
1044
			   u64 mask,
1045
			   enum iio_shared_by shared_by,
1046 1047 1048 1049 1050 1051
			   struct device *dev,
			   struct list_head *attr_list)
{
	int ret;
	struct iio_dev_attr *iio_attr, *t;

1052
	iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
1053 1054
	if (iio_attr == NULL)
		return -ENOMEM;
1055 1056
	ret = __iio_device_attr_init(&iio_attr->dev_attr,
				     postfix, chan,
1057
				     readfunc, writefunc, shared_by);
1058 1059 1060 1061 1062 1063 1064
	if (ret)
		goto error_iio_dev_attr_free;
	iio_attr->c = chan;
	iio_attr->address = mask;
	list_for_each_entry(t, attr_list, l)
		if (strcmp(t->dev_attr.attr.name,
			   iio_attr->dev_attr.attr.name) == 0) {
1065
			if (shared_by == IIO_SEPARATE)
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
				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;
}

1082 1083 1084 1085
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)
1086
{
1087
	int i, ret, attrcount = 0;
1088

1089
	for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
1090 1091
		if (i >= ARRAY_SIZE(iio_chan_info_postfix))
			return -EINVAL;
1092 1093 1094 1095 1096
		ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
					     chan,
					     &iio_read_channel_info,
					     &iio_write_channel_info,
					     i,
1097
					     shared_by,
1098 1099
					     &indio_dev->dev,
					     &indio_dev->channel_attr_list);
1100
		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
1101
			continue;
1102 1103
		else if (ret < 0)
			return ret;
1104 1105
		attrcount++;
	}
1106

1107 1108 1109
	return attrcount;
}

1110 1111 1112 1113 1114 1115 1116 1117
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)
{
	int i, ret, attrcount = 0;
	char *avail_postfix;

1118
	for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
		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,
					     &indio_dev->channel_attr_list);
		kfree(avail_postfix);
		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
			continue;
		else if (ret < 0)
			return ret;
		attrcount++;
	}

	return attrcount;
}

1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
					struct iio_chan_spec const *chan)
{
	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;

1159 1160 1161 1162 1163 1164 1165 1166
	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;

1167 1168 1169 1170 1171 1172 1173
	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;

1174 1175 1176 1177 1178 1179 1180 1181
	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;

1182 1183 1184 1185 1186 1187 1188
	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;

1189 1190 1191 1192 1193 1194 1195
	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;

1196 1197 1198 1199 1200 1201 1202
	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;

1203 1204 1205 1206 1207 1208 1209
	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;

1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227
	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,
					&indio_dev->channel_attr_list);
			i++;
			if (ret == -EBUSY && ext_info->shared)
				continue;

			if (ret)
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				return ret;
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			attrcount++;
		}
	}

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	return attrcount;
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}

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/**
 * 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
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 * attributes in the list.
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 */
void iio_free_chan_devattr_list(struct list_head *attr_list)
1245
{
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	struct iio_dev_attr *p, *n;

	list_for_each_entry_safe(p, n, attr_list, l) {
		kfree(p->dev_attr.attr.name);
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		list_del(&p->l);
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		kfree(p);
	}
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}

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static ssize_t iio_show_dev_name(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
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	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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	return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name);
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}

static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);

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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;
}

static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR,
		   iio_show_timestamp_clock, iio_store_timestamp_clock);

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static int iio_device_register_sysfs(struct iio_dev *indio_dev)
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{
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	int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
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	struct iio_dev_attr *p;
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	struct attribute **attr, *clk = NULL;
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	/* First count elements in any existing group */
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	if (indio_dev->info->attrs) {
		attr = indio_dev->info->attrs->attrs;
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		while (*attr++ != NULL)
			attrcount_orig++;
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	}
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	attrcount = attrcount_orig;
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	/*
	 * New channel registration method - relies on the fact a group does
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Peter Meerwald committed
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	 * not need to be initialized if its name is NULL.
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	 */
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	if (indio_dev->channels)
		for (i = 0; i < indio_dev->num_channels; i++) {
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			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);
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			if (ret < 0)
				goto error_clear_attrs;
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			attrcount += ret;
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		}
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	if (indio_dev->event_interface)
		clk = &dev_attr_current_timestamp_clock.attr;

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	if (indio_dev->name)
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		attrcount++;
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	if (clk)
		attrcount++;
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	indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
						   sizeof(indio_dev->chan_attr_group.attrs[0]),
						   GFP_KERNEL);
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	if (indio_dev->chan_attr_group.attrs == NULL) {
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		ret = -ENOMEM;
		goto error_clear_attrs;
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	}
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	/* Copy across original attributes */
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	if (indio_dev->info->attrs)
		memcpy(indio_dev->chan_attr_group.attrs,
		       indio_dev->info->attrs->attrs,
		       sizeof(indio_dev->chan_attr_group.attrs[0])
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		       *attrcount_orig);
	attrn = attrcount_orig;
	/* Add all elements from the list. */
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	list_for_each_entry(p, &indio_dev->channel_attr_list, l)
		indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
	if (indio_dev->name)
		indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
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	if (clk)
		indio_dev->chan_attr_group.attrs[attrn++] = clk;
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	indio_dev->groups[indio_dev->groupcounter++] =
		&indio_dev->chan_attr_group;
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	return 0;
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error_clear_attrs:
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	iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
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	return ret;
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}

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static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
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{
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	iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
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	kfree(indio_dev->chan_attr_group.attrs);
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	indio_dev->chan_attr_group.attrs = NULL;
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}

static void iio_dev_release(struct device *device)
{
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	struct iio_dev *indio_dev = dev_to_iio_dev(device);
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	if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
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		iio_device_unregister_trigger_consumer(indio_dev);
	iio_device_unregister_eventset(indio_dev);
	iio_device_unregister_sysfs(indio_dev);
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	iio_buffer_put(indio_dev->buffer);

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	ida_simple_remove(&iio_ida, indio_dev->id);
	kfree(indio_dev);
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}

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struct device_type iio_device_type = {
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	.name = "iio_device",
	.release = iio_dev_release,
};

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/**
 * iio_device_alloc() - allocate an iio_dev from a driver
 * @sizeof_priv:	Space to allocate for private structure.
 **/
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struct iio_dev *iio_device_alloc(int sizeof_priv)
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{
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	struct iio_dev *dev;
	size_t alloc_size;

	alloc_size = sizeof(struct iio_dev);
	if (sizeof_priv) {
		alloc_size = ALIGN(alloc_size, IIO_ALIGN);
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct ? */
	alloc_size += IIO_ALIGN - 1;

	dev = kzalloc(alloc_size, GFP_KERNEL);
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	if (dev) {
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		dev->dev.groups = dev->groups;
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Guenter Roeck committed
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		dev->dev.type = &iio_device_type;
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		dev->dev.bus = &iio_bus_type;
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		device_initialize(&dev->dev);
		dev_set_drvdata(&dev->dev, (void *)dev);
		mutex_init(&dev->mlock);
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		mutex_init(&dev->info_exist_lock);
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		INIT_LIST_HEAD(&dev->channel_attr_list);
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		dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
		if (dev->id < 0) {
			/* cannot use a dev_err as the name isn't available */
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			pr_err("failed to get device id\n");
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			kfree(dev);
			return NULL;
		}
		dev_set_name(&dev->dev, "iio:device%d", dev->id);
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		INIT_LIST_HEAD(&dev->buffer_list);
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	}

	return dev;
}
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EXPORT_SYMBOL(iio_device_alloc);
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/**
 * iio_device_free() - free an iio_dev from a driver
 * @dev:		the iio_dev associated with the device
 **/
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void iio_device_free(struct iio_dev *dev)
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{
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	if (dev)
		put_device(&dev->dev);
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}
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EXPORT_SYMBOL(iio_device_free);
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static void devm_iio_device_release(struct device *dev, void *res)
{
	iio_device_free(*(struct iio_dev **)res);
}

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int devm_iio_device_match(struct device *dev, void *res, void *data)
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{
	struct iio_dev **r = res;
	if (!r || !*r) {
		WARN_ON(!r || !*r);
		return 0;
	}
	return *r == data;
}
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EXPORT_SYMBOL_GPL(devm_iio_device_match);
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/**
 * devm_iio_device_alloc - Resource-managed iio_device_alloc()
 * @dev:		Device to allocate iio_dev for
 * @sizeof_priv:	Space to allocate for private structure.
 *
 * Managed iio_device_alloc. iio_dev allocated with this function is
 * automatically freed on driver detach.
 *
 * If an iio_dev allocated with this function needs to be freed separately,
 * devm_iio_device_free() must be used.
 *
 * RETURNS:
 * Pointer to allocated iio_dev on success, NULL on failure.
 */
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struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
{
	struct iio_dev **ptr, *iio_dev;

	ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
			   GFP_KERNEL);
	if (!ptr)
		return NULL;

	iio_dev = iio_device_alloc(sizeof_priv);
	if (iio_dev) {
		*ptr = iio_dev;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return iio_dev;
}
EXPORT_SYMBOL_GPL(devm_iio_device_alloc);

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/**
 * devm_iio_device_free - Resource-managed iio_device_free()
 * @dev:		Device this iio_dev belongs to
 * @iio_dev:		the iio_dev associated with the device
 *
 * Free iio_dev allocated with devm_iio_device_alloc().
 */
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void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
{
	int rc;

	rc = devres_release(dev, devm_iio_device_release,
			    devm_iio_device_match, iio_dev);
	WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_iio_device_free);

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/**
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 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
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 * @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
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 **/
static int iio_chrdev_open(struct inode *inode, struct file *filp)
{
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	struct iio_dev *indio_dev = container_of(inode->i_cdev,
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						struct iio_dev, chrdev);
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	if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
		return -EBUSY;

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	iio_device_get(indio_dev);

1585
	filp->private_data = indio_dev;
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	return 0;
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}

/**
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 * iio_chrdev_release() - chrdev file close buffer access and ioctls
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 * @inode:	Inode structure pointer for the char device
 * @filp:	File structure pointer for the char device
 *
 * Return: 0 for successful release
 */
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static int iio_chrdev_release(struct inode *inode, struct file *filp)
{
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	struct iio_dev *indio_dev = container_of(inode->i_cdev,
						struct iio_dev, chrdev);
	clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
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	iio_device_put(indio_dev);