1 /* 2 * include/linux/input/adxl34x.h 3 * 4 * Digital Accelerometer characteristics are highly application specific 5 * and may vary between boards and models. The platform_data for the 6 * device's "struct device" holds this information. 7 * 8 * Copyright 2009 Analog Devices Inc. 9 * 10 * Licensed under the GPL-2 or later. 11 */ 12 13 #ifndef __LINUX_INPUT_ADXL34X_H__ 14 #define __LINUX_INPUT_ADXL34X_H__ 15 16 #include <linux/input.h> 17 18 struct adxl34x_platform_data { 19 20 /* 21 * X,Y,Z Axis Offset: 22 * offer user offset adjustments in twoscompliment 23 * form with a scale factor of 15.6 mg/LSB (i.e. 0x7F = +2 g) 24 */ 25 26 s8 x_axis_offset; 27 s8 y_axis_offset; 28 s8 z_axis_offset; 29 30 /* 31 * TAP_X/Y/Z Enable: Setting TAP_X, Y, or Z Enable enables X, 32 * Y, or Z participation in Tap detection. A '0' excludes the 33 * selected axis from participation in Tap detection. 34 * Setting the SUPPRESS bit suppresses Double Tap detection if 35 * acceleration greater than tap_threshold is present during the 36 * tap_latency period, i.e. after the first tap but before the 37 * opening of the second tap window. 38 */ 39 40 #define ADXL_SUPPRESS (1 << 3) 41 #define ADXL_TAP_X_EN (1 << 2) 42 #define ADXL_TAP_Y_EN (1 << 1) 43 #define ADXL_TAP_Z_EN (1 << 0) 44 45 u8 tap_axis_control; 46 47 /* 48 * tap_threshold: 49 * holds the threshold value for tap detection/interrupts. 50 * The data format is unsigned. The scale factor is 62.5 mg/LSB 51 * (i.e. 0xFF = +16 g). A zero value may result in undesirable 52 * behavior if Tap/Double Tap is enabled. 53 */ 54 55 u8 tap_threshold; 56 57 /* 58 * tap_duration: 59 * is an unsigned time value representing the maximum 60 * time that an event must be above the tap_threshold threshold 61 * to qualify as a tap event. The scale factor is 625 us/LSB. A zero 62 * value will prevent Tap/Double Tap functions from working. 63 */ 64 65 u8 tap_duration; 66 67 /* 68 * tap_latency: 69 * is an unsigned time value representing the wait time 70 * from the detection of a tap event to the opening of the time 71 * window tap_window for a possible second tap event. The scale 72 * factor is 1.25 ms/LSB. A zero value will disable the Double Tap 73 * function. 74 */ 75 76 u8 tap_latency; 77 78 /* 79 * tap_window: 80 * is an unsigned time value representing the amount 81 * of time after the expiration of tap_latency during which a second 82 * tap can begin. The scale factor is 1.25 ms/LSB. A zero value will 83 * disable the Double Tap function. 84 */ 85 86 u8 tap_window; 87 88 /* 89 * act_axis_control: 90 * X/Y/Z Enable: A '1' enables X, Y, or Z participation in activity 91 * or inactivity detection. A '0' excludes the selected axis from 92 * participation. If all of the axes are excluded, the function is 93 * disabled. 94 * AC/DC: A '0' = DC coupled operation and a '1' = AC coupled 95 * operation. In DC coupled operation, the current acceleration is 96 * compared with activity_threshold and inactivity_threshold directly 97 * to determine whether activity or inactivity is detected. In AC 98 * coupled operation for activity detection, the acceleration value 99 * at the start of activity detection is taken as a reference value. 100 * New samples of acceleration are then compared to this 101 * reference value and if the magnitude of the difference exceeds 102 * activity_threshold the device will trigger an activity interrupt. In 103 * AC coupled operation for inactivity detection, a reference value 104 * is used again for comparison and is updated whenever the 105 * device exceeds the inactivity threshold. Once the reference 106 * value is selected, the device compares the magnitude of the 107 * difference between the reference value and the current 108 * acceleration with inactivity_threshold. If the difference is below 109 * inactivity_threshold for a total of inactivity_time, the device is 110 * considered inactive and the inactivity interrupt is triggered. 111 */ 112 113 #define ADXL_ACT_ACDC (1 << 7) 114 #define ADXL_ACT_X_EN (1 << 6) 115 #define ADXL_ACT_Y_EN (1 << 5) 116 #define ADXL_ACT_Z_EN (1 << 4) 117 #define ADXL_INACT_ACDC (1 << 3) 118 #define ADXL_INACT_X_EN (1 << 2) 119 #define ADXL_INACT_Y_EN (1 << 1) 120 #define ADXL_INACT_Z_EN (1 << 0) 121 122 u8 act_axis_control; 123 124 /* 125 * activity_threshold: 126 * holds the threshold value for activity detection. 127 * The data format is unsigned. The scale factor is 128 * 62.5 mg/LSB. A zero value may result in undesirable behavior if 129 * Activity interrupt is enabled. 130 */ 131 132 u8 activity_threshold; 133 134 /* 135 * inactivity_threshold: 136 * holds the threshold value for inactivity 137 * detection. The data format is unsigned. The scale 138 * factor is 62.5 mg/LSB. A zero value may result in undesirable 139 * behavior if Inactivity interrupt is enabled. 140 */ 141 142 u8 inactivity_threshold; 143 144 /* 145 * inactivity_time: 146 * is an unsigned time value representing the 147 * amount of time that acceleration must be below the value in 148 * inactivity_threshold for inactivity to be declared. The scale factor 149 * is 1 second/LSB. Unlike the other interrupt functions, which 150 * operate on unfiltered data, the inactivity function operates on the 151 * filtered output data. At least one output sample must be 152 * generated for the inactivity interrupt to be triggered. This will 153 * result in the function appearing un-responsive if the 154 * inactivity_time register is set with a value less than the time 155 * constant of the Output Data Rate. A zero value will result in an 156 * interrupt when the output data is below inactivity_threshold. 157 */ 158 159 u8 inactivity_time; 160 161 /* 162 * free_fall_threshold: 163 * holds the threshold value for Free-Fall detection. 164 * The data format is unsigned. The root-sum-square(RSS) value 165 * of all axes is calculated and compared to the value in 166 * free_fall_threshold to determine if a free fall event may be 167 * occurring. The scale factor is 62.5 mg/LSB. A zero value may 168 * result in undesirable behavior if Free-Fall interrupt is 169 * enabled. Values between 300 and 600 mg (0x05 to 0x09) are 170 * recommended. 171 */ 172 173 u8 free_fall_threshold; 174 175 /* 176 * free_fall_time: 177 * is an unsigned time value representing the minimum 178 * time that the RSS value of all axes must be less than 179 * free_fall_threshold to generate a Free-Fall interrupt. The 180 * scale factor is 5 ms/LSB. A zero value may result in 181 * undesirable behavior if Free-Fall interrupt is enabled. 182 * Values between 100 to 350 ms (0x14 to 0x46) are recommended. 183 */ 184 185 u8 free_fall_time; 186 187 /* 188 * data_rate: 189 * Selects device bandwidth and output data rate. 190 * RATE = 3200 Hz / (2^(15 - x)). Default value is 0x0A, or 100 Hz 191 * Output Data Rate. An Output Data Rate should be selected that 192 * is appropriate for the communication protocol and frequency 193 * selected. Selecting too high of an Output Data Rate with a low 194 * communication speed will result in samples being discarded. 195 */ 196 197 u8 data_rate; 198 199 /* 200 * data_range: 201 * FULL_RES: When this bit is set with the device is 202 * in Full-Resolution Mode, where the output resolution increases 203 * with RANGE to maintain a 4 mg/LSB scale factor. When this 204 * bit is cleared the device is in 10-bit Mode and RANGE determine the 205 * maximum g-Range and scale factor. 206 */ 207 208 #define ADXL_FULL_RES (1 << 3) 209 #define ADXL_RANGE_PM_2g 0 210 #define ADXL_RANGE_PM_4g 1 211 #define ADXL_RANGE_PM_8g 2 212 #define ADXL_RANGE_PM_16g 3 213 214 u8 data_range; 215 216 /* 217 * low_power_mode: 218 * A '0' = Normal operation and a '1' = Reduced 219 * power operation with somewhat higher noise. 220 */ 221 222 u8 low_power_mode; 223 224 /* 225 * power_mode: 226 * LINK: A '1' with both the activity and inactivity functions 227 * enabled will delay the start of the activity function until 228 * inactivity is detected. Once activity is detected, inactivity 229 * detection will begin and prevent the detection of activity. This 230 * bit serially links the activity and inactivity functions. When '0' 231 * the inactivity and activity functions are concurrent. Additional 232 * information can be found in the ADXL34x datasheet's Application 233 * section under Link Mode. 234 * AUTO_SLEEP: A '1' sets the ADXL34x to switch to Sleep Mode 235 * when inactivity (acceleration has been below inactivity_threshold 236 * for at least inactivity_time) is detected and the LINK bit is set. 237 * A '0' disables automatic switching to Sleep Mode. See the 238 * Sleep Bit section of the ADXL34x datasheet for more information. 239 */ 240 241 #define ADXL_LINK (1 << 5) 242 #define ADXL_AUTO_SLEEP (1 << 4) 243 244 u8 power_mode; 245 246 /* 247 * fifo_mode: 248 * BYPASS The FIFO is bypassed 249 * FIFO FIFO collects up to 32 values then stops collecting data 250 * STREAM FIFO holds the last 32 data values. Once full, the FIFO's 251 * oldest data is lost as it is replaced with newer data 252 * 253 * DEFAULT should be ADXL_FIFO_STREAM 254 */ 255 256 #define ADXL_FIFO_BYPASS 0 257 #define ADXL_FIFO_FIFO 1 258 #define ADXL_FIFO_STREAM 2 259 260 u8 fifo_mode; 261 262 /* 263 * watermark: 264 * The Watermark feature can be used to reduce the interrupt load 265 * of the system. The FIFO fills up to the value stored in watermark 266 * [1..32] and then generates an interrupt. 267 * A '0' disables the watermark feature. 268 */ 269 270 u8 watermark; 271 272 /* 273 * When acceleration measurements are received from the ADXL34x 274 * events are sent to the event subsystem. The following settings 275 * select the event type and event code for new x, y and z axis data 276 * respectively. 277 */ 278 u32 ev_type; /* EV_ABS or EV_REL */ 279 280 u32 ev_code_x; /* ABS_X,Y,Z or REL_X,Y,Z */ 281 u32 ev_code_y; /* ABS_X,Y,Z or REL_X,Y,Z */ 282 u32 ev_code_z; /* ABS_X,Y,Z or REL_X,Y,Z */ 283 284 /* 285 * A valid BTN or KEY Code; use tap_axis_control to disable 286 * event reporting 287 */ 288 289 u32 ev_code_tap[3]; /* EV_KEY {X-Axis, Y-Axis, Z-Axis} */ 290 291 /* 292 * A valid BTN or KEY Code for Free-Fall or Activity enables 293 * input event reporting. A '0' disables the Free-Fall or 294 * Activity reporting. 295 */ 296 297 u32 ev_code_ff; /* EV_KEY */ 298 u32 ev_code_act_inactivity; /* EV_KEY */ 299 300 /* 301 * Use ADXL34x INT2 pin instead of INT1 pin for interrupt output 302 */ 303 u8 use_int2; 304 305 /* 306 * ADXL346 only ORIENTATION SENSING feature 307 * The orientation function of the ADXL346 reports both 2-D and 308 * 3-D orientation concurrently. 309 */ 310 311 #define ADXL_EN_ORIENTATION_2D 1 312 #define ADXL_EN_ORIENTATION_3D 2 313 #define ADXL_EN_ORIENTATION_2D_3D 3 314 315 u8 orientation_enable; 316 317 /* 318 * The width of the deadzone region between two or more 319 * orientation positions is determined by setting the Deadzone 320 * value. The deadzone region size can be specified with a 321 * resolution of 3.6deg. The deadzone angle represents the total 322 * angle where the orientation is considered invalid. 323 */ 324 325 #define ADXL_DEADZONE_ANGLE_0p0 0 /* !!!0.0 [deg] */ 326 #define ADXL_DEADZONE_ANGLE_3p6 1 /* 3.6 [deg] */ 327 #define ADXL_DEADZONE_ANGLE_7p2 2 /* 7.2 [deg] */ 328 #define ADXL_DEADZONE_ANGLE_10p8 3 /* 10.8 [deg] */ 329 #define ADXL_DEADZONE_ANGLE_14p4 4 /* 14.4 [deg] */ 330 #define ADXL_DEADZONE_ANGLE_18p0 5 /* 18.0 [deg] */ 331 #define ADXL_DEADZONE_ANGLE_21p6 6 /* 21.6 [deg] */ 332 #define ADXL_DEADZONE_ANGLE_25p2 7 /* 25.2 [deg] */ 333 334 u8 deadzone_angle; 335 336 /* 337 * To eliminate most human motion such as walking or shaking, 338 * a Divisor value should be selected to effectively limit the 339 * orientation bandwidth. Set the depth of the filter used to 340 * low-pass filter the measured acceleration for stable 341 * orientation sensing 342 */ 343 344 #define ADXL_LP_FILTER_DIVISOR_2 0 345 #define ADXL_LP_FILTER_DIVISOR_4 1 346 #define ADXL_LP_FILTER_DIVISOR_8 2 347 #define ADXL_LP_FILTER_DIVISOR_16 3 348 #define ADXL_LP_FILTER_DIVISOR_32 4 349 #define ADXL_LP_FILTER_DIVISOR_64 5 350 #define ADXL_LP_FILTER_DIVISOR_128 6 351 #define ADXL_LP_FILTER_DIVISOR_256 7 352 353 u8 divisor_length; 354 355 u32 ev_codes_orient_2d[4]; /* EV_KEY {+X, -X, +Y, -Y} */ 356 u32 ev_codes_orient_3d[6]; /* EV_KEY {+Z, +Y, +X, -X, -Y, -Z} */ 357 }; 358 #endif 359