1/* SPDX-License-Identifier: GPL-2.0-only */
2/* The industrial I/O core
3 *
4 *Copyright (c) 2008 Jonathan Cameron
5 *
6 * General attributes
7 */
8
9#ifndef _INDUSTRIAL_IO_SYSFS_H_
10#define _INDUSTRIAL_IO_SYSFS_H_
11
12struct iio_buffer;
13struct iio_chan_spec;
14
15/**
16 * struct iio_dev_attr - iio specific device attribute
17 * @dev_attr: underlying device attribute
18 * @address: associated register address
19 * @l: list head for maintaining list of dynamically created attrs
20 * @c: specification for the underlying channel
21 * @buffer: the IIO buffer to which this attribute belongs to (if any)
22 */
23struct iio_dev_attr {
24 struct device_attribute dev_attr;
25 u64 address;
26 struct list_head l;
27 struct iio_chan_spec const *c;
28 struct iio_buffer *buffer;
29};
30
31#define to_iio_dev_attr(_dev_attr) \
32 container_of(_dev_attr, struct iio_dev_attr, dev_attr)
33
34ssize_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 */
44struct 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_ATTR_RO(_name, _addr) \
59 { .dev_attr = __ATTR_RO(_name), \
60 .address = _addr }
61
62#define IIO_ATTR_WO(_name, _addr) \
63 { .dev_attr = __ATTR_WO(_name), \
64 .address = _addr }
65
66#define IIO_ATTR_RW(_name, _addr) \
67 { .dev_attr = __ATTR_RW(_name), \
68 .address = _addr }
69
70#define IIO_DEVICE_ATTR(_name, _mode, _show, _store, _addr) \
71 struct iio_dev_attr iio_dev_attr_##_name \
72 = IIO_ATTR(_name, _mode, _show, _store, _addr)
73
74#define IIO_DEVICE_ATTR_RO(_name, _addr) \
75 struct iio_dev_attr iio_dev_attr_##_name \
76 = IIO_ATTR_RO(_name, _addr)
77
78#define IIO_DEVICE_ATTR_WO(_name, _addr) \
79 struct iio_dev_attr iio_dev_attr_##_name \
80 = IIO_ATTR_WO(_name, _addr)
81
82#define IIO_DEVICE_ATTR_RW(_name, _addr) \
83 struct iio_dev_attr iio_dev_attr_##_name \
84 = IIO_ATTR_RW(_name, _addr)
85
86#define IIO_DEVICE_ATTR_NAMED(_vname, _name, _mode, _show, _store, _addr) \
87 struct iio_dev_attr iio_dev_attr_##_vname \
88 = IIO_ATTR(_name, _mode, _show, _store, _addr)
89
90#define IIO_CONST_ATTR(_name, _string) \
91 struct iio_const_attr iio_const_attr_##_name \
92 = { .string = _string, \
93 .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
94
95#define IIO_CONST_ATTR_NAMED(_vname, _name, _string) \
96 struct iio_const_attr iio_const_attr_##_vname \
97 = { .string = _string, \
98 .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
99
100#define IIO_STATIC_CONST_DEVICE_ATTR(_name, _string) \
101 static ssize_t iio_const_dev_attr_show_##_name( \
102 struct device *dev, \
103 struct device_attribute *attr, \
104 char *buf) \
105 { \
106 return sysfs_emit(buf, "%s\n", _string); \
107 } \
108 static IIO_DEVICE_ATTR(_name, 0444, \
109 iio_const_dev_attr_show_##_name, NULL, 0)
110
111/* Generic attributes of onetype or another */
112
113/**
114 * IIO_DEV_ATTR_SAMP_FREQ - sets any internal clock frequency
115 * @_mode: sysfs file mode/permissions
116 * @_show: output method for the attribute
117 * @_store: input method for the attribute
118 **/
119#define IIO_DEV_ATTR_SAMP_FREQ(_mode, _show, _store) \
120 IIO_DEVICE_ATTR(sampling_frequency, _mode, _show, _store, 0)
121
122/**
123 * IIO_DEV_ATTR_SAMP_FREQ_AVAIL - list available sampling frequencies
124 * @_show: output method for the attribute
125 *
126 * May be mode dependent on some devices
127 **/
128#define IIO_DEV_ATTR_SAMP_FREQ_AVAIL(_show) \
129 IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO, _show, NULL, 0)
130/**
131 * IIO_CONST_ATTR_SAMP_FREQ_AVAIL - list available sampling frequencies
132 * @_string: frequency string for the attribute
133 *
134 * Constant version
135 **/
136#define IIO_CONST_ATTR_SAMP_FREQ_AVAIL(_string) \
137 IIO_CONST_ATTR(sampling_frequency_available, _string)
138
139/**
140 * IIO_DEV_ATTR_INT_TIME_AVAIL - list available integration times
141 * @_show: output method for the attribute
142 **/
143#define IIO_DEV_ATTR_INT_TIME_AVAIL(_show) \
144 IIO_DEVICE_ATTR(integration_time_available, S_IRUGO, _show, NULL, 0)
145/**
146 * IIO_CONST_ATTR_INT_TIME_AVAIL - list available integration times
147 * @_string: frequency string for the attribute
148 *
149 * Constant version
150 **/
151#define IIO_CONST_ATTR_INT_TIME_AVAIL(_string) \
152 IIO_CONST_ATTR(integration_time_available, _string)
153
154#define IIO_DEV_ATTR_TEMP_RAW(_show) \
155 IIO_DEVICE_ATTR(in_temp_raw, S_IRUGO, _show, NULL, 0)
156
157#define IIO_CONST_ATTR_TEMP_OFFSET(_string) \
158 IIO_CONST_ATTR(in_temp_offset, _string)
159
160#define IIO_CONST_ATTR_TEMP_SCALE(_string) \
161 IIO_CONST_ATTR(in_temp_scale, _string)
162
163#endif /* _INDUSTRIAL_IO_SYSFS_H_ */
164

source code of linux/include/linux/iio/sysfs.h

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