2 /* The industrial I/O core
4 * Copyright (c) 2008 Jonathan Cameron
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 #ifndef _INDUSTRIAL_IO_H_
11 #define _INDUSTRIAL_IO_H_
13 #include <linux/device.h>
14 #include <linux/cdev.h>
18 * Provide means of adjusting timer accuracy.
19 * Currently assumes nano seconds.
27 /* Could add the raw attributes as well - allowing buffer only devices */
28 enum iio_chan_info_enum {
29 /* 0 is reserverd for raw attributes */
30 IIO_CHAN_INFO_SCALE = 1,
32 IIO_CHAN_INFO_CALIBSCALE,
33 IIO_CHAN_INFO_CALIBBIAS,
35 IIO_CHAN_INFO_PEAK_SCALE,
36 IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW,
37 IIO_CHAN_INFO_AVERAGE_RAW,
40 #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2)
41 #define IIO_CHAN_INFO_SEPARATE_BIT(type) BIT(type*2 + 1)
43 #define IIO_CHAN_INFO_SCALE_SEPARATE_BIT \
44 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_SCALE)
45 #define IIO_CHAN_INFO_SCALE_SHARED_BIT \
46 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_SCALE)
47 #define IIO_CHAN_INFO_OFFSET_SEPARATE_BIT \
48 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_OFFSET)
49 #define IIO_CHAN_INFO_OFFSET_SHARED_BIT \
50 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_OFFSET)
51 #define IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT \
52 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_CALIBSCALE)
53 #define IIO_CHAN_INFO_CALIBSCALE_SHARED_BIT \
54 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_CALIBSCALE)
55 #define IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT \
56 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_CALIBBIAS)
57 #define IIO_CHAN_INFO_CALIBBIAS_SHARED_BIT \
58 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_CALIBBIAS)
59 #define IIO_CHAN_INFO_PEAK_SEPARATE_BIT \
60 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PEAK)
61 #define IIO_CHAN_INFO_PEAK_SHARED_BIT \
62 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PEAK)
63 #define IIO_CHAN_INFO_PEAKSCALE_SEPARATE_BIT \
64 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PEAKSCALE)
65 #define IIO_CHAN_INFO_PEAKSCALE_SHARED_BIT \
66 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PEAKSCALE)
67 #define IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SEPARATE_BIT \
68 IIO_CHAN_INFO_SEPARATE_BIT( \
69 IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW)
70 #define IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SHARED_BIT \
71 IIO_CHAN_INFO_SHARED_BIT( \
72 IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW)
73 #define IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT \
74 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_AVERAGE_RAW)
75 #define IIO_CHAN_INFO_AVERAGE_RAW_SHARED_BIT \
76 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_AVERAGE_RAW)
85 * struct iio_chan_spec - specification of a single channel
86 * @type: What type of measurement is the channel making.
87 * @channel: What number or name do we wish to asign the channel.
88 * @channel2: If there is a second number for a differential
89 * channel then this is it. If modified is set then the
90 * value here specifies the modifier.
91 * @address: Driver specific identifier.
92 * @scan_index: Monotonic index to give ordering in scans when read
94 * @scan_type: Sign: 's' or 'u' to specify signed or unsigned
95 * realbits: Number of valid bits of data
96 * storage_bits: Realbits + padding
97 * shift: Shift right by this before masking out
99 * endianness: little or big endian
100 * @info_mask: What information is to be exported about this channel.
101 * This includes calibbias, scale etc.
102 * @event_mask: What events can this channel produce.
103 * @extend_name: Allows labeling of channel attributes with an
104 * informative name. Note this has no effect codes etc,
106 * @processed_val: Flag to specify the data access attribute should be
107 * *_input rather than *_raw.
108 * @modified: Does a modifier apply to this channel. What these are
109 * depends on the channel type. Modifier is set in
110 * channel2. Examples are IIO_MOD_X for axial sensors about
112 * @indexed: Specify the channel has a numerical index. If not,
113 * the value in channel will be suppressed for attribute
114 * but not for event codes. Typically set it to 0 when
115 * the index is false.
116 * @differential: Channel is differential.
118 struct iio_chan_spec {
119 enum iio_chan_type type;
122 unsigned long address;
129 enum iio_endian endianness;
134 unsigned processed_val:1;
138 unsigned differential:1;
141 #define IIO_ST(si, rb, sb, sh) \
142 { .sign = si, .realbits = rb, .storagebits = sb, .shift = sh }
144 /* Macro assumes input channels */
145 #define IIO_CHAN(_type, _mod, _indexed, _proc, _name, _chan, _chan2, \
146 _inf_mask, _address, _si, _stype, _event_mask) \
150 .indexed = _indexed, \
151 .processed_val = _proc, \
152 .extend_name = _name, \
154 .channel2 = _chan2, \
155 .info_mask = _inf_mask, \
156 .address = _address, \
158 .scan_type = _stype, \
159 .event_mask = _event_mask }
161 #define IIO_CHAN_SOFT_TIMESTAMP(_si) \
162 { .type = IIO_TIMESTAMP, .channel = -1, \
163 .scan_index = _si, .scan_type = IIO_ST('s', 64, 64, 0) }
166 * iio_get_time_ns() - utility function to get a time stamp for events etc
168 static inline s64 iio_get_time_ns(void)
172 * calls getnstimeofday.
173 * If hrtimers then up to ns accurate, if not microsecond.
175 ktime_get_real_ts(&ts);
177 return timespec_to_ns(&ts);
180 /* Device operating modes */
181 #define INDIO_DIRECT_MODE 0x01
182 #define INDIO_BUFFER_TRIGGERED 0x02
183 #define INDIO_BUFFER_HARDWARE 0x08
185 #define INDIO_ALL_BUFFER_MODES \
186 (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE)
188 /* Vast majority of this is set by the industrialio subsystem on a
189 * call to iio_device_register. */
190 #define IIO_VAL_INT 1
191 #define IIO_VAL_INT_PLUS_MICRO 2
192 #define IIO_VAL_INT_PLUS_NANO 3
194 struct iio_trigger; /* forward declaration */
198 * struct iio_info - constant information about device
199 * @driver_module: module structure used to ensure correct
200 * ownership of chrdevs etc
201 * @event_attrs: event control attributes
202 * @attrs: general purpose device attributes
203 * @read_raw: function to request a value from the device.
204 * mask specifies which value. Note 0 means a reading of
205 * the channel in question. Return value will specify the
206 * type of value returned by the device. val and val2 will
207 * contain the elements making up the returned value.
208 * @write_raw: function to write a value to the device.
209 * Parameters are the same as for read_raw.
210 * @write_raw_get_fmt: callback function to query the expected
211 * format/precision. If not set by the driver, write_raw
212 * returns IIO_VAL_INT_PLUS_MICRO.
213 * @read_event_config: find out if the event is enabled.
214 * @write_event_config: set if the event is enabled.
215 * @read_event_value: read a value associated with the event. Meaning
216 * is event dependant. event_code specifies which event.
217 * @write_event_value: write the value associate with the event.
218 * Meaning is event dependent.
219 * @validate_trigger: function to validate the trigger when the
220 * current trigger gets changed.
223 struct module *driver_module;
224 struct attribute_group *event_attrs;
225 const struct attribute_group *attrs;
227 int (*read_raw)(struct iio_dev *indio_dev,
228 struct iio_chan_spec const *chan,
233 int (*write_raw)(struct iio_dev *indio_dev,
234 struct iio_chan_spec const *chan,
239 int (*write_raw_get_fmt)(struct iio_dev *indio_dev,
240 struct iio_chan_spec const *chan,
243 int (*read_event_config)(struct iio_dev *indio_dev,
246 int (*write_event_config)(struct iio_dev *indio_dev,
250 int (*read_event_value)(struct iio_dev *indio_dev,
253 int (*write_event_value)(struct iio_dev *indio_dev,
256 int (*validate_trigger)(struct iio_dev *indio_dev,
257 struct iio_trigger *trig);
262 * struct iio_dev - industrial I/O device
263 * @id: [INTERN] used to identify device internally
264 * @modes: [DRIVER] operating modes supported by device
265 * @currentmode: [DRIVER] current operating mode
266 * @dev: [DRIVER] device structure, should be assigned a parent
268 * @event_interface: [INTERN] event chrdevs associated with interrupt lines
269 * @buffer: [DRIVER] any buffer present
270 * @mlock: [INTERN] lock used to prevent simultaneous device state
272 * @available_scan_masks: [DRIVER] optional array of allowed bitmasks
273 * @masklength: [INTERN] the length of the mask established from
275 * @trig: [INTERN] current device trigger (buffer modes)
276 * @pollfunc: [DRIVER] function run on trigger being received
277 * @channels: [DRIVER] channel specification structure table
278 * @num_channels: [DRIVER] number of chanels specified in @channels.
279 * @channel_attr_list: [INTERN] keep track of automatically created channel
281 * @chan_attr_group: [INTERN] group for all attrs in base directory
282 * @name: [DRIVER] name of the device.
283 * @info: [DRIVER] callbacks and constant info from driver
284 * @chrdev: [INTERN] associated character device
285 * @groups: [INTERN] attribute groups
286 * @groupcounter: [INTERN] index of next attribute group
295 struct iio_event_interface *event_interface;
297 struct iio_buffer *buffer;
300 unsigned long *available_scan_masks;
302 struct iio_trigger *trig;
303 struct iio_poll_func *pollfunc;
305 struct iio_chan_spec const *channels;
308 struct list_head channel_attr_list;
309 struct attribute_group chan_attr_group;
311 const struct iio_info *info;
313 #define IIO_MAX_GROUPS 6
314 const struct attribute_group *groups[IIO_MAX_GROUPS + 1];
319 * iio_device_register() - register a device with the IIO subsystem
320 * @indio_dev: Device structure filled by the device driver
322 int iio_device_register(struct iio_dev *indio_dev);
325 * iio_device_unregister() - unregister a device from the IIO subsystem
326 * @indio_dev: Device structure representing the device.
328 void iio_device_unregister(struct iio_dev *indio_dev);
331 * iio_push_event() - try to add event to the list for userspace reading
332 * @indio_dev: IIO device structure
333 * @ev_code: What event
334 * @timestamp: When the event occurred
336 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp);
338 extern struct bus_type iio_bus_type;
341 * iio_put_device() - reference counted deallocation of struct device
342 * @dev: the iio_device containing the device
344 static inline void iio_put_device(struct iio_dev *indio_dev)
347 put_device(&indio_dev->dev);
350 /* Can we make this smaller? */
351 #define IIO_ALIGN L1_CACHE_BYTES
353 * iio_allocate_device() - allocate an iio_dev from a driver
354 * @sizeof_priv: Space to allocate for private structure.
356 struct iio_dev *iio_allocate_device(int sizeof_priv);
358 static inline void *iio_priv(const struct iio_dev *indio_dev)
360 return (char *)indio_dev + ALIGN(sizeof(struct iio_dev), IIO_ALIGN);
363 static inline struct iio_dev *iio_priv_to_dev(void *priv)
365 return (struct iio_dev *)((char *)priv -
366 ALIGN(sizeof(struct iio_dev), IIO_ALIGN));
370 * iio_free_device() - free an iio_dev from a driver
371 * @dev: the iio_dev associated with the device
373 void iio_free_device(struct iio_dev *indio_dev);
376 * iio_buffer_enabled() - helper function to test if the buffer is enabled
377 * @indio_dev: IIO device info structure for device
379 static inline bool iio_buffer_enabled(struct iio_dev *indio_dev)
381 return indio_dev->currentmode
382 & (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE);
385 #endif /* _INDUSTRIAL_IO_H_ */