1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * include/linux/input/adxl34x.h
4 *
5 * Digital Accelerometer characteristics are highly application specific
6 * and may vary between boards and models. The platform_data for the
7 * device's "struct device" holds this information.
8 *
9 * Copyright 2009 Analog Devices Inc.
10 */
11
12 #ifndef __LINUX_INPUT_ADXL34X_H__
13 #define __LINUX_INPUT_ADXL34X_H__
14
15 #include <linux/input.h>
16
17 struct adxl34x_platform_data {
18
19 /*
20 * X,Y,Z Axis Offset:
21 * offer user offset adjustments in twoscompliment
22 * form with a scale factor of 15.6 mg/LSB (i.e. 0x7F = +2 g)
23 */
24
25 s8 x_axis_offset;
26 s8 y_axis_offset;
27 s8 z_axis_offset;
28
29 /*
30 * TAP_X/Y/Z Enable: Setting TAP_X, Y, or Z Enable enables X,
31 * Y, or Z participation in Tap detection. A '0' excludes the
32 * selected axis from participation in Tap detection.
33 * Setting the SUPPRESS bit suppresses Double Tap detection if
34 * acceleration greater than tap_threshold is present during the
35 * tap_latency period, i.e. after the first tap but before the
36 * opening of the second tap window.
37 */
38
39 #define ADXL_SUPPRESS (1 << 3)
40 #define ADXL_TAP_X_EN (1 << 2)
41 #define ADXL_TAP_Y_EN (1 << 1)
42 #define ADXL_TAP_Z_EN (1 << 0)
43
44 u8 tap_axis_control;
45
46 /*
47 * tap_threshold:
48 * holds the threshold value for tap detection/interrupts.
49 * The data format is unsigned. The scale factor is 62.5 mg/LSB
50 * (i.e. 0xFF = +16 g). A zero value may result in undesirable
51 * behavior if Tap/Double Tap is enabled.
52 */
53
54 u8 tap_threshold;
55
56 /*
57 * tap_duration:
58 * is an unsigned time value representing the maximum
59 * time that an event must be above the tap_threshold threshold
60 * to qualify as a tap event. The scale factor is 625 us/LSB. A zero
61 * value will prevent Tap/Double Tap functions from working.
62 */
63
64 u8 tap_duration;
65
66 /*
67 * tap_latency:
68 * is an unsigned time value representing the wait time
69 * from the detection of a tap event to the opening of the time
70 * window tap_window for a possible second tap event. The scale
71 * factor is 1.25 ms/LSB. A zero value will disable the Double Tap
72 * function.
73 */
74
75 u8 tap_latency;
76
77 /*
78 * tap_window:
79 * is an unsigned time value representing the amount
80 * of time after the expiration of tap_latency during which a second
81 * tap can begin. The scale factor is 1.25 ms/LSB. A zero value will
82 * disable the Double Tap function.
83 */
84
85 u8 tap_window;
86
87 /*
88 * act_axis_control:
89 * X/Y/Z Enable: A '1' enables X, Y, or Z participation in activity
90 * or inactivity detection. A '0' excludes the selected axis from
91 * participation. If all of the axes are excluded, the function is
92 * disabled.
93 * AC/DC: A '0' = DC coupled operation and a '1' = AC coupled
94 * operation. In DC coupled operation, the current acceleration is
95 * compared with activity_threshold and inactivity_threshold directly
96 * to determine whether activity or inactivity is detected. In AC
97 * coupled operation for activity detection, the acceleration value
98 * at the start of activity detection is taken as a reference value.
99 * New samples of acceleration are then compared to this
100 * reference value and if the magnitude of the difference exceeds
101 * activity_threshold the device will trigger an activity interrupt. In
102 * AC coupled operation for inactivity detection, a reference value
103 * is used again for comparison and is updated whenever the
104 * device exceeds the inactivity threshold. Once the reference
105 * value is selected, the device compares the magnitude of the
106 * difference between the reference value and the current
107 * acceleration with inactivity_threshold. If the difference is below
108 * inactivity_threshold for a total of inactivity_time, the device is
109 * considered inactive and the inactivity interrupt is triggered.
110 */
111
112 #define ADXL_ACT_ACDC (1 << 7)
113 #define ADXL_ACT_X_EN (1 << 6)
114 #define ADXL_ACT_Y_EN (1 << 5)
115 #define ADXL_ACT_Z_EN (1 << 4)
116 #define ADXL_INACT_ACDC (1 << 3)
117 #define ADXL_INACT_X_EN (1 << 2)
118 #define ADXL_INACT_Y_EN (1 << 1)
119 #define ADXL_INACT_Z_EN (1 << 0)
120
121 u8 act_axis_control;
122
123 /*
124 * activity_threshold:
125 * holds the threshold value for activity detection.
126 * The data format is unsigned. The scale factor is
127 * 62.5 mg/LSB. A zero value may result in undesirable behavior if
128 * Activity interrupt is enabled.
129 */
130
131 u8 activity_threshold;
132
133 /*
134 * inactivity_threshold:
135 * holds the threshold value for inactivity
136 * detection. The data format is unsigned. The scale
137 * factor is 62.5 mg/LSB. A zero value may result in undesirable
138 * behavior if Inactivity interrupt is enabled.
139 */
140
141 u8 inactivity_threshold;
142
143 /*
144 * inactivity_time:
145 * is an unsigned time value representing the
146 * amount of time that acceleration must be below the value in
147 * inactivity_threshold for inactivity to be declared. The scale factor
148 * is 1 second/LSB. Unlike the other interrupt functions, which
149 * operate on unfiltered data, the inactivity function operates on the
150 * filtered output data. At least one output sample must be
151 * generated for the inactivity interrupt to be triggered. This will
152 * result in the function appearing un-responsive if the
153 * inactivity_time register is set with a value less than the time
154 * constant of the Output Data Rate. A zero value will result in an
155 * interrupt when the output data is below inactivity_threshold.
156 */
157
158 u8 inactivity_time;
159
160 /*
161 * free_fall_threshold:
162 * holds the threshold value for Free-Fall detection.
163 * The data format is unsigned. The root-sum-square(RSS) value
164 * of all axes is calculated and compared to the value in
165 * free_fall_threshold to determine if a free fall event may be
166 * occurring. The scale factor is 62.5 mg/LSB. A zero value may
167 * result in undesirable behavior if Free-Fall interrupt is
168 * enabled. Values between 300 and 600 mg (0x05 to 0x09) are
169 * recommended.
170 */
171
172 u8 free_fall_threshold;
173
174 /*
175 * free_fall_time:
176 * is an unsigned time value representing the minimum
177 * time that the RSS value of all axes must be less than
178 * free_fall_threshold to generate a Free-Fall interrupt. The
179 * scale factor is 5 ms/LSB. A zero value may result in
180 * undesirable behavior if Free-Fall interrupt is enabled.
181 * Values between 100 to 350 ms (0x14 to 0x46) are recommended.
182 */
183
184 u8 free_fall_time;
185
186 /*
187 * data_rate:
188 * Selects device bandwidth and output data rate.
189 * RATE = 3200 Hz / (2^(15 - x)). Default value is 0x0A, or 100 Hz
190 * Output Data Rate. An Output Data Rate should be selected that
191 * is appropriate for the communication protocol and frequency
192 * selected. Selecting too high of an Output Data Rate with a low
193 * communication speed will result in samples being discarded.
194 */
195
196 u8 data_rate;
197
198 /*
199 * data_range:
200 * FULL_RES: When this bit is set with the device is
201 * in Full-Resolution Mode, where the output resolution increases
202 * with RANGE to maintain a 4 mg/LSB scale factor. When this
203 * bit is cleared the device is in 10-bit Mode and RANGE determine the
204 * maximum g-Range and scale factor.
205 */
206
207 #define ADXL_FULL_RES (1 << 3)
208 #define ADXL_RANGE_PM_2g 0
209 #define ADXL_RANGE_PM_4g 1
210 #define ADXL_RANGE_PM_8g 2
211 #define ADXL_RANGE_PM_16g 3
212
213 u8 data_range;
214
215 /*
216 * low_power_mode:
217 * A '0' = Normal operation and a '1' = Reduced
218 * power operation with somewhat higher noise.
219 */
220
221 u8 low_power_mode;
222
223 /*
224 * power_mode:
225 * LINK: A '1' with both the activity and inactivity functions
226 * enabled will delay the start of the activity function until
227 * inactivity is detected. Once activity is detected, inactivity
228 * detection will begin and prevent the detection of activity. This
229 * bit serially links the activity and inactivity functions. When '0'
230 * the inactivity and activity functions are concurrent. Additional
231 * information can be found in the ADXL34x datasheet's Application
232 * section under Link Mode.
233 * AUTO_SLEEP: A '1' sets the ADXL34x to switch to Sleep Mode
234 * when inactivity (acceleration has been below inactivity_threshold
235 * for at least inactivity_time) is detected and the LINK bit is set.
236 * A '0' disables automatic switching to Sleep Mode. See the
237 * Sleep Bit section of the ADXL34x datasheet for more information.
238 */
239
240 #define ADXL_LINK (1 << 5)
241 #define ADXL_AUTO_SLEEP (1 << 4)
242
243 u8 power_mode;
244
245 /*
246 * fifo_mode:
247 * BYPASS The FIFO is bypassed
248 * FIFO FIFO collects up to 32 values then stops collecting data
249 * STREAM FIFO holds the last 32 data values. Once full, the FIFO's
250 * oldest data is lost as it is replaced with newer data
251 *
252 * DEFAULT should be ADXL_FIFO_STREAM
253 */
254
255 #define ADXL_FIFO_BYPASS 0
256 #define ADXL_FIFO_FIFO 1
257 #define ADXL_FIFO_STREAM 2
258
259 u8 fifo_mode;
260
261 /*
262 * watermark:
263 * The Watermark feature can be used to reduce the interrupt load
264 * of the system. The FIFO fills up to the value stored in watermark
265 * [1..32] and then generates an interrupt.
266 * A '0' disables the watermark feature.
267 */
268
269 u8 watermark;
270
271 /*
272 * When acceleration measurements are received from the ADXL34x
273 * events are sent to the event subsystem. The following settings
274 * select the event type and event code for new x, y and z axis data
275 * respectively.
276 */
277 u32 ev_type; /* EV_ABS or EV_REL */
278
279 u32 ev_code_x; /* ABS_X,Y,Z or REL_X,Y,Z */
280 u32 ev_code_y; /* ABS_X,Y,Z or REL_X,Y,Z */
281 u32 ev_code_z; /* ABS_X,Y,Z or REL_X,Y,Z */
282
283 /*
284 * A valid BTN or KEY Code; use tap_axis_control to disable
285 * event reporting
286 */
287
288 u32 ev_code_tap[3]; /* EV_KEY {X-Axis, Y-Axis, Z-Axis} */
289
290 /*
291 * A valid BTN or KEY Code for Free-Fall or Activity enables
292 * input event reporting. A '0' disables the Free-Fall or
293 * Activity reporting.
294 */
295
296 u32 ev_code_ff; /* EV_KEY */
297 u32 ev_code_act_inactivity; /* EV_KEY */
298
299 /*
300 * Use ADXL34x INT2 pin instead of INT1 pin for interrupt output
301 */
302 u8 use_int2;
303
304 /*
305 * ADXL346 only ORIENTATION SENSING feature
306 * The orientation function of the ADXL346 reports both 2-D and
307 * 3-D orientation concurrently.
308 */
309
310 #define ADXL_EN_ORIENTATION_2D 1
311 #define ADXL_EN_ORIENTATION_3D 2
312 #define ADXL_EN_ORIENTATION_2D_3D 3
313
314 u8 orientation_enable;
315
316 /*
317 * The width of the deadzone region between two or more
318 * orientation positions is determined by setting the Deadzone
319 * value. The deadzone region size can be specified with a
320 * resolution of 3.6deg. The deadzone angle represents the total
321 * angle where the orientation is considered invalid.
322 */
323
324 #define ADXL_DEADZONE_ANGLE_0p0 0 /* !!!0.0 [deg] */
325 #define ADXL_DEADZONE_ANGLE_3p6 1 /* 3.6 [deg] */
326 #define ADXL_DEADZONE_ANGLE_7p2 2 /* 7.2 [deg] */
327 #define ADXL_DEADZONE_ANGLE_10p8 3 /* 10.8 [deg] */
328 #define ADXL_DEADZONE_ANGLE_14p4 4 /* 14.4 [deg] */
329 #define ADXL_DEADZONE_ANGLE_18p0 5 /* 18.0 [deg] */
330 #define ADXL_DEADZONE_ANGLE_21p6 6 /* 21.6 [deg] */
331 #define ADXL_DEADZONE_ANGLE_25p2 7 /* 25.2 [deg] */
332
333 u8 deadzone_angle;
334
335 /*
336 * To eliminate most human motion such as walking or shaking,
337 * a Divisor value should be selected to effectively limit the
338 * orientation bandwidth. Set the depth of the filter used to
339 * low-pass filter the measured acceleration for stable
340 * orientation sensing
341 */
342
343 #define ADXL_LP_FILTER_DIVISOR_2 0
344 #define ADXL_LP_FILTER_DIVISOR_4 1
345 #define ADXL_LP_FILTER_DIVISOR_8 2
346 #define ADXL_LP_FILTER_DIVISOR_16 3
347 #define ADXL_LP_FILTER_DIVISOR_32 4
348 #define ADXL_LP_FILTER_DIVISOR_64 5
349 #define ADXL_LP_FILTER_DIVISOR_128 6
350 #define ADXL_LP_FILTER_DIVISOR_256 7
351
352 u8 divisor_length;
353
354 u32 ev_codes_orient_2d[4]; /* EV_KEY {+X, -X, +Y, -Y} */
355 u32 ev_codes_orient_3d[6]; /* EV_KEY {+Z, +Y, +X, -X, -Y, -Z} */
356 };
357 #endif