sysfs.h
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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.
*
* General attributes
*/
#ifndef _INDUSTRIAL_IO_SYSFS_H_
#define _INDUSTRIAL_IO_SYSFS_H_
struct iio_chan_spec;
/**
* struct iio_dev_attr - iio specific device attribute
* @dev_attr: underlying device attribute
* @address: associated register address
* @l: list head for maintaining list of dynamically created attrs.
*/
struct iio_dev_attr {
struct device_attribute dev_attr;
u64 address;
struct list_head l;
struct iio_chan_spec const *c;
};
#define to_iio_dev_attr(_dev_attr) \
container_of(_dev_attr, struct iio_dev_attr, dev_attr)
ssize_t iio_read_const_attr(struct device *dev,
struct device_attribute *attr,
char *len);
/**
* struct iio_const_attr - constant device specific attribute
* often used for things like available modes
* @string: attribute string
* @dev_attr: underlying device attribute
*/
struct iio_const_attr {
const char *string;
struct device_attribute dev_attr;
};
#define to_iio_const_attr(_dev_attr) \
container_of(_dev_attr, struct iio_const_attr, dev_attr)
/* Some attributes will be hard coded (device dependent) and not require an
address, in these cases pass a negative */
#define IIO_ATTR(_name, _mode, _show, _store, _addr) \
{ .dev_attr = __ATTR(_name, _mode, _show, _store), \
.address = _addr }
#define IIO_DEVICE_ATTR(_name, _mode, _show, _store, _addr) \
struct iio_dev_attr iio_dev_attr_##_name \
= IIO_ATTR(_name, _mode, _show, _store, _addr)
#define IIO_DEVICE_ATTR_NAMED(_vname, _name, _mode, _show, _store, _addr) \
struct iio_dev_attr iio_dev_attr_##_vname \
= IIO_ATTR(_name, _mode, _show, _store, _addr)
#define IIO_CONST_ATTR(_name, _string) \
struct iio_const_attr iio_const_attr_##_name \
= { .string = _string, \
.dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
#define IIO_CONST_ATTR_NAMED(_vname, _name, _string) \
struct iio_const_attr iio_const_attr_##_vname \
= { .string = _string, \
.dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
/* Generic attributes of onetype or another */
/**
* IIO_DEV_ATTR_SAMP_FREQ - sets any internal clock frequency
* @_mode: sysfs file mode/permissions
* @_show: output method for the attribute
* @_store: input method for the attribute
**/
#define IIO_DEV_ATTR_SAMP_FREQ(_mode, _show, _store) \
IIO_DEVICE_ATTR(sampling_frequency, _mode, _show, _store, 0)
/**
* IIO_DEV_ATTR_SAMP_FREQ_AVAIL - list available sampling frequencies
* @_show: output method for the attribute
*
* May be mode dependent on some devices
**/
#define IIO_DEV_ATTR_SAMP_FREQ_AVAIL(_show) \
IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO, _show, NULL, 0)
/**
* IIO_CONST_ATTR_SAMP_FREQ_AVAIL - list available sampling frequencies
* @_string: frequency string for the attribute
*
* Constant version
**/
#define IIO_CONST_ATTR_SAMP_FREQ_AVAIL(_string) \
IIO_CONST_ATTR(sampling_frequency_available, _string)
/**
* IIO_DEV_ATTR_INT_TIME_AVAIL - list available integration times
* @_show: output method for the attribute
**/
#define IIO_DEV_ATTR_INT_TIME_AVAIL(_show) \
IIO_DEVICE_ATTR(integration_time_available, S_IRUGO, _show, NULL, 0)
/**
* IIO_CONST_ATTR_INT_TIME_AVAIL - list available integration times
* @_string: frequency string for the attribute
*
* Constant version
**/
#define IIO_CONST_ATTR_INT_TIME_AVAIL(_string) \
IIO_CONST_ATTR(integration_time_available, _string)
#define IIO_DEV_ATTR_TEMP_RAW(_show) \
IIO_DEVICE_ATTR(in_temp_raw, S_IRUGO, _show, NULL, 0)
#define IIO_CONST_ATTR_TEMP_OFFSET(_string) \
IIO_CONST_ATTR(in_temp_offset, _string)
#define IIO_CONST_ATTR_TEMP_SCALE(_string) \
IIO_CONST_ATTR(in_temp_scale, _string)
#endif /* _INDUSTRIAL_IO_SYSFS_H_ */