include/linux/iio/sysfs.h

   1 /* The industrial I/O core
   2  *
   3  *Copyright (c) 2008 Jonathan Cameron
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * General attributes
  10  */
  11
  12 #ifndef _INDUSTRIAL_IO_SYSFS_H_
  13 #define _INDUSTRIAL_IO_SYSFS_H_
  14
  15 struct iio_chan_spec;
  16
  17 /**
  18  * struct iio_dev_attr - iio specific device attribute
  19  * @dev_attr:   underlying device attribute
  20  * @address:    associated register address
  21  * @l:          list head for maintaining list of dynamically created attrs
  22  * @c:          specification for the underlying channel
  23  */
  24 struct iio_dev_attr {
  25         struct device_attribute dev_attr;
  26         u64 address;
  27         struct list_head l;
  28         struct iio_chan_spec const *c;
  29 };
  30
  31 #define to_iio_dev_attr(_dev_attr)                              \
  32         container_of(_dev_attr, struct iio_dev_attr, dev_attr)
  33
  34 ssize_t iio_read_const_attr(struct device *dev,
  35                             struct device_attribute *attr,
  36                             char *len);
  37
  38 /**
  39  * struct iio_const_attr - constant device specific attribute
  40  *                         often used for things like available modes
  41  * @string:     attribute string
  42  * @dev_attr:   underlying device attribute
  43  */
  44 struct iio_const_attr {
  45         const char *string;
  46         struct device_attribute dev_attr;
  47 };
  48
  49 #define to_iio_const_attr(_dev_attr) \
  50         container_of(_dev_attr, struct iio_const_attr, dev_attr)
  51
  52 /* Some attributes will be hard coded (device dependent) and not require an
  53    address, in these cases pass a negative */
  54 #define IIO_ATTR(_name, _mode, _show, _store, _addr)            \
  55         { .dev_attr = __ATTR(_name, _mode, _show, _store),      \
  56           .address = _addr }
  57
  58 #define IIO_DEVICE_ATTR(_name, _mode, _show, _store, _addr)     \
  59         struct iio_dev_attr iio_dev_attr_##_name                \
  60         = IIO_ATTR(_name, _mode, _show, _store, _addr)
  61
  62 #define IIO_DEVICE_ATTR_NAMED(_vname, _name, _mode, _show, _store, _addr) \
  63         struct iio_dev_attr iio_dev_attr_##_vname                       \
  64         = IIO_ATTR(_name, _mode, _show, _store, _addr)
  65
  66 #define IIO_CONST_ATTR(_name, _string)                                  \
  67         struct iio_const_attr iio_const_attr_##_name                    \
  68         = { .string = _string,                                          \
  69             .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
  70
  71 #define IIO_CONST_ATTR_NAMED(_vname, _name, _string)                    \
  72         struct iio_const_attr iio_const_attr_##_vname                   \
  73         = { .string = _string,                                          \
  74             .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
  75
  76 /* Generic attributes of onetype or another */
  77
  78 /**
  79  * IIO_DEV_ATTR_SAMP_FREQ - sets any internal clock frequency
  80  * @_mode: sysfs file mode/permissions
  81  * @_show: output method for the attribute
  82  * @_store: input method for the attribute
  83  **/
  84 #define IIO_DEV_ATTR_SAMP_FREQ(_mode, _show, _store)                    \
  85         IIO_DEVICE_ATTR(sampling_frequency, _mode, _show, _store, 0)
  86
  87 /**
  88  * IIO_DEV_ATTR_SAMP_FREQ_AVAIL - list available sampling frequencies
  89  * @_show: output method for the attribute
  90  *
  91  * May be mode dependent on some devices
  92  **/
  93 #define IIO_DEV_ATTR_SAMP_FREQ_AVAIL(_show)                             \
  94         IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO, _show, NULL, 0)
  95 /**
  96  * IIO_CONST_ATTR_SAMP_FREQ_AVAIL - list available sampling frequencies
  97  * @_string: frequency string for the attribute
  98  *
  99  * Constant version
 100  **/
 101 #define IIO_CONST_ATTR_SAMP_FREQ_AVAIL(_string)                 \
 102         IIO_CONST_ATTR(sampling_frequency_available, _string)
 103
 104 /**
 105  * IIO_DEV_ATTR_INT_TIME_AVAIL - list available integration times
 106  * @_show: output method for the attribute
 107  **/
 108 #define IIO_DEV_ATTR_INT_TIME_AVAIL(_show)              \
 109         IIO_DEVICE_ATTR(integration_time_available, S_IRUGO, _show, NULL, 0)
 110 /**
 111  * IIO_CONST_ATTR_INT_TIME_AVAIL - list available integration times
 112  * @_string: frequency string for the attribute
 113  *
 114  * Constant version
 115  **/
 116 #define IIO_CONST_ATTR_INT_TIME_AVAIL(_string)          \
 117         IIO_CONST_ATTR(integration_time_available, _string)
 118
 119 #define IIO_DEV_ATTR_TEMP_RAW(_show)                    \
 120         IIO_DEVICE_ATTR(in_temp_raw, S_IRUGO, _show, NULL, 0)
 121
 122 #define IIO_CONST_ATTR_TEMP_OFFSET(_string)             \
 123         IIO_CONST_ATTR(in_temp_offset, _string)
 124
 125 #define IIO_CONST_ATTR_TEMP_SCALE(_string)              \
 126         IIO_CONST_ATTR(in_temp_scale, _string)
 127
 128 #endif /* _INDUSTRIAL_IO_SYSFS_H_ */