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 {
    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 {
    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 */
#define IIO_DEV_ATTR_RESET(_store)          \
    IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, _store, 0)

#define IIO_DEV_ATTR_SAMP_FREQ(_mode, _show, _store)            \
    IIO_DEVICE_ATTR(sampling_frequency, _mode, _show, _store, 0)

#define IIO_DEV_ATTR_SAMP_FREQ_AVAIL(_show)             \
    IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO, _show, NULL, 0)

#define IIO_CONST_ATTR_SAMP_FREQ_AVAIL(_string)         \
    IIO_CONST_ATTR(sampling_frequency_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_ */