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synced 2024-08-25 10:19:47 +00:00
![Lars-Peter Clausen](/assets/img/avatar_default.png)
Drvdata is typically used by drivers to attach driver specific data to a
device. It is used to retrieve driver specific information when only the
device to which the data is attached is available.
In the IIO core in the `iio_device_alloc()` function we call
`iio_device_set_drvdata(indio_dev, indio_dev)`. This sets the drvdata of
the IIO device to itself.
This is rather unnecessary since if we have a pointer to the IIO device to
call `iio_device_get_drvdata()` on it we don't need to call the function
since we already have the pointer. If we only have a pointer to the `struct
device` we can use `dev_to_iio_dev()` to get the IIO device from it.
Furthermore the drvdata is supposed to be reserved for drivers, so it
should not be used by the IIO core in the first place.
The `set_drvdata()` has been around from the very beginning of the IIO
framework and back then it was used in the IIO device sysfs attribute
handling code. But that was subsequently replaced with a `dev_to_iio_dev()`
in commit e53f5ac52e
("iio: Use dev_to_iio_dev()") and other cleanups.
The self `set_drvdata()` is now no longer needed and can be removed.
Verified that there no longer any users by checking for potential users
using the following two coccinelle scripts and reviewing that none of the
matches are problematic code.
<smpl>
@@
struct iio_dev *iio_dev;
expression dev;
identifier fn !~ "(remove|resume|suspend)";
@@
fn(...)
{
...
*iio_dev = dev_get_drvdata(dev)
...
}
</smpl>
<smpl>
@r1@
position p;
struct iio_dev *indio_dev;
identifier dev_fn =~ "^dev_";
identifier devm_fn =~ "^devm_";
@@
(
dev_fn
|
devm_fn
)
(&indio_dev@p->dev, ...)
@@
struct iio_dev *indio_dev;
position p != r1.p;
@@
*&indio_dev@p->dev</smpl>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2067 lines
53 KiB
C
2067 lines
53 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) {
|
|
dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
|
|
sizeof(iio_dev_opaque->read_buf),
|
|
"0x%X\n", val);
|
|
|
|
return simple_read_from_buffer(userbuf, count, ppos,
|
|
iio_dev_opaque->read_buf,
|
|
iio_dev_opaque->read_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;
|
|
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
|
|
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", ®, &val);
|
|
|
|
switch (ret) {
|
|
case 1:
|
|
iio_dev_opaque->cached_reg_addr = reg;
|
|
break;
|
|
case 2:
|
|
iio_dev_opaque->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 = {
|
|
.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]);
|
|
case IIO_VAL_INT_64:
|
|
tmp2 = (s64)((((u64)vals[1]) << 32) | (u32)vals[0]);
|
|
return sysfs_emit_at(buf, offset, "%lld", tmp2);
|
|
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 indio_dev->info->read_label(indio_dev, this_attr->c, buf);
|
|
|
|
if (this_attr->c->extend_name)
|
|
return sprintf(buf, "%s\n", this_attr->c->extend_name);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
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 && !chan->extend_name)
|
|
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);
|
|
iio_dev_opaque->groups = NULL;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
const 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);
|
|
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;
|
|
}
|
|
|
|
if (dev_set_name(&indio_dev->dev, "iio:device%d", iio_dev_opaque->id)) {
|
|
ida_simple_remove(&iio_ida, iio_dev_opaque->id);
|
|
kfree(iio_dev_opaque);
|
|
return NULL;
|
|
}
|
|
|
|
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,
|
|
.write = iio_buffer_write_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 int iio_check_extended_name(const struct iio_dev *indio_dev)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!indio_dev->info->read_label)
|
|
return 0;
|
|
|
|
for (i = 0; i < indio_dev->num_channels; i++) {
|
|
if (indio_dev->channels[i].extend_name) {
|
|
dev_err(&indio_dev->dev,
|
|
"Cannot use labels and extend_name at the same time\n");
|
|
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;
|
|
|
|
ret = iio_check_extended_name(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");
|