1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * ADXL372 3-Axis Digital Accelerometer core driver 4 * 5 * Copyright 2018 Analog Devices Inc. 6 */ 7 8 #include <linux/bitfield.h> 9 #include <linux/bitops.h> 10 #include <linux/interrupt.h> 11 #include <linux/irq.h> 12 #include <linux/module.h> 13 #include <linux/regmap.h> 14 #include <linux/spi/spi.h> 15 16 #include <linux/iio/iio.h> 17 #include <linux/iio/sysfs.h> 18 #include <linux/iio/buffer.h> 19 #include <linux/iio/events.h> 20 #include <linux/iio/trigger.h> 21 #include <linux/iio/trigger_consumer.h> 22 #include <linux/iio/triggered_buffer.h> 23 24 #include "adxl372.h" 25 26 /* ADXL372 registers definition */ 27 #define ADXL372_DEVID 0x00 28 #define ADXL372_DEVID_MST 0x01 29 #define ADXL372_PARTID 0x02 30 #define ADXL372_STATUS_1 0x04 31 #define ADXL372_STATUS_2 0x05 32 #define ADXL372_FIFO_ENTRIES_2 0x06 33 #define ADXL372_FIFO_ENTRIES_1 0x07 34 #define ADXL372_X_DATA_H 0x08 35 #define ADXL372_X_DATA_L 0x09 36 #define ADXL372_Y_DATA_H 0x0A 37 #define ADXL372_Y_DATA_L 0x0B 38 #define ADXL372_Z_DATA_H 0x0C 39 #define ADXL372_Z_DATA_L 0x0D 40 #define ADXL372_X_MAXPEAK_H 0x15 41 #define ADXL372_X_MAXPEAK_L 0x16 42 #define ADXL372_Y_MAXPEAK_H 0x17 43 #define ADXL372_Y_MAXPEAK_L 0x18 44 #define ADXL372_Z_MAXPEAK_H 0x19 45 #define ADXL372_Z_MAXPEAK_L 0x1A 46 #define ADXL372_OFFSET_X 0x20 47 #define ADXL372_OFFSET_Y 0x21 48 #define ADXL372_OFFSET_Z 0x22 49 #define ADXL372_X_THRESH_ACT_H 0x23 50 #define ADXL372_X_THRESH_ACT_L 0x24 51 #define ADXL372_Y_THRESH_ACT_H 0x25 52 #define ADXL372_Y_THRESH_ACT_L 0x26 53 #define ADXL372_Z_THRESH_ACT_H 0x27 54 #define ADXL372_Z_THRESH_ACT_L 0x28 55 #define ADXL372_TIME_ACT 0x29 56 #define ADXL372_X_THRESH_INACT_H 0x2A 57 #define ADXL372_X_THRESH_INACT_L 0x2B 58 #define ADXL372_Y_THRESH_INACT_H 0x2C 59 #define ADXL372_Y_THRESH_INACT_L 0x2D 60 #define ADXL372_Z_THRESH_INACT_H 0x2E 61 #define ADXL372_Z_THRESH_INACT_L 0x2F 62 #define ADXL372_TIME_INACT_H 0x30 63 #define ADXL372_TIME_INACT_L 0x31 64 #define ADXL372_X_THRESH_ACT2_H 0x32 65 #define ADXL372_X_THRESH_ACT2_L 0x33 66 #define ADXL372_Y_THRESH_ACT2_H 0x34 67 #define ADXL372_Y_THRESH_ACT2_L 0x35 68 #define ADXL372_Z_THRESH_ACT2_H 0x36 69 #define ADXL372_Z_THRESH_ACT2_L 0x37 70 #define ADXL372_HPF 0x38 71 #define ADXL372_FIFO_SAMPLES 0x39 72 #define ADXL372_FIFO_CTL 0x3A 73 #define ADXL372_INT1_MAP 0x3B 74 #define ADXL372_INT2_MAP 0x3C 75 #define ADXL372_TIMING 0x3D 76 #define ADXL372_MEASURE 0x3E 77 #define ADXL372_POWER_CTL 0x3F 78 #define ADXL372_SELF_TEST 0x40 79 #define ADXL372_RESET 0x41 80 #define ADXL372_FIFO_DATA 0x42 81 82 #define ADXL372_DEVID_VAL 0xAD 83 #define ADXL372_PARTID_VAL 0xFA 84 #define ADXL372_RESET_CODE 0x52 85 86 /* ADXL372_POWER_CTL */ 87 #define ADXL372_POWER_CTL_MODE_MSK GENMASK_ULL(1, 0) 88 #define ADXL372_POWER_CTL_MODE(x) (((x) & 0x3) << 0) 89 90 /* ADXL372_MEASURE */ 91 #define ADXL372_MEASURE_LINKLOOP_MSK GENMASK_ULL(5, 4) 92 #define ADXL372_MEASURE_LINKLOOP_MODE(x) (((x) & 0x3) << 4) 93 #define ADXL372_MEASURE_BANDWIDTH_MSK GENMASK_ULL(2, 0) 94 #define ADXL372_MEASURE_BANDWIDTH_MODE(x) (((x) & 0x7) << 0) 95 96 /* ADXL372_TIMING */ 97 #define ADXL372_TIMING_ODR_MSK GENMASK_ULL(7, 5) 98 #define ADXL372_TIMING_ODR_MODE(x) (((x) & 0x7) << 5) 99 100 /* ADXL372_FIFO_CTL */ 101 #define ADXL372_FIFO_CTL_FORMAT_MSK GENMASK(5, 3) 102 #define ADXL372_FIFO_CTL_FORMAT_MODE(x) (((x) & 0x7) << 3) 103 #define ADXL372_FIFO_CTL_MODE_MSK GENMASK(2, 1) 104 #define ADXL372_FIFO_CTL_MODE_MODE(x) (((x) & 0x3) << 1) 105 #define ADXL372_FIFO_CTL_SAMPLES_MSK BIT(1) 106 #define ADXL372_FIFO_CTL_SAMPLES_MODE(x) (((x) > 0xFF) ? 1 : 0) 107 108 /* ADXL372_STATUS_1 */ 109 #define ADXL372_STATUS_1_DATA_RDY(x) (((x) >> 0) & 0x1) 110 #define ADXL372_STATUS_1_FIFO_RDY(x) (((x) >> 1) & 0x1) 111 #define ADXL372_STATUS_1_FIFO_FULL(x) (((x) >> 2) & 0x1) 112 #define ADXL372_STATUS_1_FIFO_OVR(x) (((x) >> 3) & 0x1) 113 #define ADXL372_STATUS_1_USR_NVM_BUSY(x) (((x) >> 5) & 0x1) 114 #define ADXL372_STATUS_1_AWAKE(x) (((x) >> 6) & 0x1) 115 #define ADXL372_STATUS_1_ERR_USR_REGS(x) (((x) >> 7) & 0x1) 116 117 /* ADXL372_STATUS_2 */ 118 #define ADXL372_STATUS_2_INACT(x) (((x) >> 4) & 0x1) 119 #define ADXL372_STATUS_2_ACT(x) (((x) >> 5) & 0x1) 120 #define ADXL372_STATUS_2_AC2(x) (((x) >> 6) & 0x1) 121 122 /* ADXL372_INT1_MAP */ 123 #define ADXL372_INT1_MAP_DATA_RDY_MSK BIT(0) 124 #define ADXL372_INT1_MAP_DATA_RDY_MODE(x) (((x) & 0x1) << 0) 125 #define ADXL372_INT1_MAP_FIFO_RDY_MSK BIT(1) 126 #define ADXL372_INT1_MAP_FIFO_RDY_MODE(x) (((x) & 0x1) << 1) 127 #define ADXL372_INT1_MAP_FIFO_FULL_MSK BIT(2) 128 #define ADXL372_INT1_MAP_FIFO_FULL_MODE(x) (((x) & 0x1) << 2) 129 #define ADXL372_INT1_MAP_FIFO_OVR_MSK BIT(3) 130 #define ADXL372_INT1_MAP_FIFO_OVR_MODE(x) (((x) & 0x1) << 3) 131 #define ADXL372_INT1_MAP_INACT_MSK BIT(4) 132 #define ADXL372_INT1_MAP_INACT_MODE(x) (((x) & 0x1) << 4) 133 #define ADXL372_INT1_MAP_ACT_MSK BIT(5) 134 #define ADXL372_INT1_MAP_ACT_MODE(x) (((x) & 0x1) << 5) 135 #define ADXL372_INT1_MAP_AWAKE_MSK BIT(6) 136 #define ADXL372_INT1_MAP_AWAKE_MODE(x) (((x) & 0x1) << 6) 137 #define ADXL372_INT1_MAP_LOW_MSK BIT(7) 138 #define ADXL372_INT1_MAP_LOW_MODE(x) (((x) & 0x1) << 7) 139 140 /* ADX372_THRESH */ 141 #define ADXL372_THRESH_VAL_H_MSK GENMASK(10, 3) 142 #define ADXL372_THRESH_VAL_H_SEL(x) FIELD_GET(ADXL372_THRESH_VAL_H_MSK, x) 143 #define ADXL372_THRESH_VAL_L_MSK GENMASK(2, 0) 144 #define ADXL372_THRESH_VAL_L_SEL(x) FIELD_GET(ADXL372_THRESH_VAL_L_MSK, x) 145 146 /* The ADXL372 includes a deep, 512 sample FIFO buffer */ 147 #define ADXL372_FIFO_SIZE 512 148 #define ADXL372_X_AXIS_EN(x) ((x) & BIT(0)) 149 #define ADXL372_Y_AXIS_EN(x) ((x) & BIT(1)) 150 #define ADXL372_Z_AXIS_EN(x) ((x) & BIT(2)) 151 152 /* 153 * At +/- 200g with 12-bit resolution, scale is computed as: 154 * (200 + 200) * 9.81 / (2^12 - 1) = 0.958241 155 */ 156 #define ADXL372_USCALE 958241 157 158 enum adxl372_op_mode { 159 ADXL372_STANDBY, 160 ADXL372_WAKE_UP, 161 ADXL372_INSTANT_ON, 162 ADXL372_FULL_BW_MEASUREMENT, 163 }; 164 165 enum adxl372_act_proc_mode { 166 ADXL372_DEFAULT, 167 ADXL372_LINKED, 168 ADXL372_LOOPED, 169 }; 170 171 enum adxl372_th_activity { 172 ADXL372_ACTIVITY, 173 ADXL372_ACTIVITY2, 174 ADXL372_INACTIVITY, 175 }; 176 177 enum adxl372_odr { 178 ADXL372_ODR_400HZ, 179 ADXL372_ODR_800HZ, 180 ADXL372_ODR_1600HZ, 181 ADXL372_ODR_3200HZ, 182 ADXL372_ODR_6400HZ, 183 }; 184 185 enum adxl372_bandwidth { 186 ADXL372_BW_200HZ, 187 ADXL372_BW_400HZ, 188 ADXL372_BW_800HZ, 189 ADXL372_BW_1600HZ, 190 ADXL372_BW_3200HZ, 191 }; 192 193 static const unsigned int adxl372_th_reg_high_addr[3] = { 194 [ADXL372_ACTIVITY] = ADXL372_X_THRESH_ACT_H, 195 [ADXL372_ACTIVITY2] = ADXL372_X_THRESH_ACT2_H, 196 [ADXL372_INACTIVITY] = ADXL372_X_THRESH_INACT_H, 197 }; 198 199 enum adxl372_fifo_format { 200 ADXL372_XYZ_FIFO, 201 ADXL372_X_FIFO, 202 ADXL372_Y_FIFO, 203 ADXL372_XY_FIFO, 204 ADXL372_Z_FIFO, 205 ADXL372_XZ_FIFO, 206 ADXL372_YZ_FIFO, 207 ADXL372_XYZ_PEAK_FIFO, 208 }; 209 210 enum adxl372_fifo_mode { 211 ADXL372_FIFO_BYPASSED, 212 ADXL372_FIFO_STREAMED, 213 ADXL372_FIFO_TRIGGERED, 214 ADXL372_FIFO_OLD_SAVED 215 }; 216 217 static const int adxl372_samp_freq_tbl[5] = { 218 400, 800, 1600, 3200, 6400, 219 }; 220 221 static const int adxl372_bw_freq_tbl[5] = { 222 200, 400, 800, 1600, 3200, 223 }; 224 225 struct adxl372_axis_lookup { 226 unsigned int bits; 227 enum adxl372_fifo_format fifo_format; 228 }; 229 230 static const struct adxl372_axis_lookup adxl372_axis_lookup_table[] = { 231 { BIT(0), ADXL372_X_FIFO }, 232 { BIT(1), ADXL372_Y_FIFO }, 233 { BIT(2), ADXL372_Z_FIFO }, 234 { BIT(0) | BIT(1), ADXL372_XY_FIFO }, 235 { BIT(0) | BIT(2), ADXL372_XZ_FIFO }, 236 { BIT(1) | BIT(2), ADXL372_YZ_FIFO }, 237 { BIT(0) | BIT(1) | BIT(2), ADXL372_XYZ_FIFO }, 238 }; 239 240 static const struct iio_event_spec adxl372_events[] = { 241 { 242 .type = IIO_EV_TYPE_THRESH, 243 .dir = IIO_EV_DIR_RISING, 244 .mask_separate = BIT(IIO_EV_INFO_VALUE), 245 .mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD) | BIT(IIO_EV_INFO_ENABLE), 246 }, { 247 .type = IIO_EV_TYPE_THRESH, 248 .dir = IIO_EV_DIR_FALLING, 249 .mask_separate = BIT(IIO_EV_INFO_VALUE), 250 .mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD) | BIT(IIO_EV_INFO_ENABLE), 251 }, 252 }; 253 254 #define ADXL372_ACCEL_CHANNEL(index, reg, axis) { \ 255 .type = IIO_ACCEL, \ 256 .address = reg, \ 257 .modified = 1, \ 258 .channel2 = IIO_MOD_##axis, \ 259 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 260 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ 261 BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ 262 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ 263 .scan_index = index, \ 264 .scan_type = { \ 265 .sign = 's', \ 266 .realbits = 12, \ 267 .storagebits = 16, \ 268 .shift = 4, \ 269 .endianness = IIO_BE, \ 270 }, \ 271 .event_spec = adxl372_events, \ 272 .num_event_specs = ARRAY_SIZE(adxl372_events) \ 273 } 274 275 static const struct iio_chan_spec adxl372_channels[] = { 276 ADXL372_ACCEL_CHANNEL(0, ADXL372_X_DATA_H, X), 277 ADXL372_ACCEL_CHANNEL(1, ADXL372_Y_DATA_H, Y), 278 ADXL372_ACCEL_CHANNEL(2, ADXL372_Z_DATA_H, Z), 279 }; 280 281 struct adxl372_state { 282 int irq; 283 struct device *dev; 284 struct regmap *regmap; 285 struct iio_trigger *dready_trig; 286 struct iio_trigger *peak_datardy_trig; 287 enum adxl372_fifo_mode fifo_mode; 288 enum adxl372_fifo_format fifo_format; 289 unsigned int fifo_axis_mask; 290 enum adxl372_op_mode op_mode; 291 enum adxl372_act_proc_mode act_proc_mode; 292 enum adxl372_odr odr; 293 enum adxl372_bandwidth bw; 294 u32 act_time_ms; 295 u32 inact_time_ms; 296 u8 fifo_set_size; 297 unsigned long int1_bitmask; 298 unsigned long int2_bitmask; 299 u16 watermark; 300 __be16 fifo_buf[ADXL372_FIFO_SIZE]; 301 bool peak_fifo_mode_en; 302 struct mutex threshold_m; /* lock for threshold */ 303 }; 304 305 static const unsigned long adxl372_channel_masks[] = { 306 BIT(0), BIT(1), BIT(2), 307 BIT(0) | BIT(1), 308 BIT(0) | BIT(2), 309 BIT(1) | BIT(2), 310 BIT(0) | BIT(1) | BIT(2), 311 0 312 }; 313 adxl372_read_threshold_value(struct iio_dev * indio_dev,unsigned int addr,u16 * threshold)314 static ssize_t adxl372_read_threshold_value(struct iio_dev *indio_dev, unsigned int addr, 315 u16 *threshold) 316 { 317 struct adxl372_state *st = iio_priv(indio_dev); 318 __be16 raw_regval; 319 u16 regval; 320 int ret; 321 322 ret = regmap_bulk_read(st->regmap, addr, &raw_regval, sizeof(raw_regval)); 323 if (ret < 0) 324 return ret; 325 326 regval = be16_to_cpu(raw_regval); 327 regval >>= 5; 328 329 *threshold = regval; 330 331 return 0; 332 } 333 adxl372_write_threshold_value(struct iio_dev * indio_dev,unsigned int addr,u16 threshold)334 static ssize_t adxl372_write_threshold_value(struct iio_dev *indio_dev, unsigned int addr, 335 u16 threshold) 336 { 337 struct adxl372_state *st = iio_priv(indio_dev); 338 int ret; 339 340 mutex_lock(&st->threshold_m); 341 ret = regmap_write(st->regmap, addr, ADXL372_THRESH_VAL_H_SEL(threshold)); 342 if (ret < 0) 343 goto unlock; 344 345 ret = regmap_update_bits(st->regmap, addr + 1, GENMASK(7, 5), 346 ADXL372_THRESH_VAL_L_SEL(threshold) << 5); 347 348 unlock: 349 mutex_unlock(&st->threshold_m); 350 351 return ret; 352 } 353 adxl372_read_axis(struct adxl372_state * st,u8 addr)354 static int adxl372_read_axis(struct adxl372_state *st, u8 addr) 355 { 356 __be16 regval; 357 int ret; 358 359 ret = regmap_bulk_read(st->regmap, addr, ®val, sizeof(regval)); 360 if (ret < 0) 361 return ret; 362 363 return be16_to_cpu(regval); 364 } 365 adxl372_set_op_mode(struct adxl372_state * st,enum adxl372_op_mode op_mode)366 static int adxl372_set_op_mode(struct adxl372_state *st, 367 enum adxl372_op_mode op_mode) 368 { 369 int ret; 370 371 ret = regmap_update_bits(st->regmap, ADXL372_POWER_CTL, 372 ADXL372_POWER_CTL_MODE_MSK, 373 ADXL372_POWER_CTL_MODE(op_mode)); 374 if (ret < 0) 375 return ret; 376 377 st->op_mode = op_mode; 378 379 return ret; 380 } 381 adxl372_set_odr(struct adxl372_state * st,enum adxl372_odr odr)382 static int adxl372_set_odr(struct adxl372_state *st, 383 enum adxl372_odr odr) 384 { 385 int ret; 386 387 ret = regmap_update_bits(st->regmap, ADXL372_TIMING, 388 ADXL372_TIMING_ODR_MSK, 389 ADXL372_TIMING_ODR_MODE(odr)); 390 if (ret < 0) 391 return ret; 392 393 st->odr = odr; 394 395 return ret; 396 } 397 adxl372_find_closest_match(const int * array,unsigned int size,int val)398 static int adxl372_find_closest_match(const int *array, 399 unsigned int size, int val) 400 { 401 int i; 402 403 for (i = 0; i < size; i++) { 404 if (val <= array[i]) 405 return i; 406 } 407 408 return size - 1; 409 } 410 adxl372_set_bandwidth(struct adxl372_state * st,enum adxl372_bandwidth bw)411 static int adxl372_set_bandwidth(struct adxl372_state *st, 412 enum adxl372_bandwidth bw) 413 { 414 int ret; 415 416 ret = regmap_update_bits(st->regmap, ADXL372_MEASURE, 417 ADXL372_MEASURE_BANDWIDTH_MSK, 418 ADXL372_MEASURE_BANDWIDTH_MODE(bw)); 419 if (ret < 0) 420 return ret; 421 422 st->bw = bw; 423 424 return ret; 425 } 426 adxl372_set_act_proc_mode(struct adxl372_state * st,enum adxl372_act_proc_mode mode)427 static int adxl372_set_act_proc_mode(struct adxl372_state *st, 428 enum adxl372_act_proc_mode mode) 429 { 430 int ret; 431 432 ret = regmap_update_bits(st->regmap, 433 ADXL372_MEASURE, 434 ADXL372_MEASURE_LINKLOOP_MSK, 435 ADXL372_MEASURE_LINKLOOP_MODE(mode)); 436 if (ret < 0) 437 return ret; 438 439 st->act_proc_mode = mode; 440 441 return ret; 442 } 443 adxl372_set_activity_threshold(struct adxl372_state * st,enum adxl372_th_activity act,bool ref_en,bool enable,unsigned int threshold)444 static int adxl372_set_activity_threshold(struct adxl372_state *st, 445 enum adxl372_th_activity act, 446 bool ref_en, bool enable, 447 unsigned int threshold) 448 { 449 unsigned char buf[6]; 450 unsigned char th_reg_high_val, th_reg_low_val, th_reg_high_addr; 451 452 /* scale factor is 100 mg/code */ 453 th_reg_high_val = (threshold / 100) >> 3; 454 th_reg_low_val = ((threshold / 100) << 5) | (ref_en << 1) | enable; 455 th_reg_high_addr = adxl372_th_reg_high_addr[act]; 456 457 buf[0] = th_reg_high_val; 458 buf[1] = th_reg_low_val; 459 buf[2] = th_reg_high_val; 460 buf[3] = th_reg_low_val; 461 buf[4] = th_reg_high_val; 462 buf[5] = th_reg_low_val; 463 464 return regmap_bulk_write(st->regmap, th_reg_high_addr, 465 buf, ARRAY_SIZE(buf)); 466 } 467 adxl372_set_activity_time_ms(struct adxl372_state * st,unsigned int act_time_ms)468 static int adxl372_set_activity_time_ms(struct adxl372_state *st, 469 unsigned int act_time_ms) 470 { 471 unsigned int reg_val, scale_factor; 472 int ret; 473 474 /* 475 * 3.3 ms per code is the scale factor of the TIME_ACT register for 476 * ODR = 6400 Hz. It is 6.6 ms per code for ODR = 3200 Hz and below. 477 */ 478 if (st->odr == ADXL372_ODR_6400HZ) 479 scale_factor = 3300; 480 else 481 scale_factor = 6600; 482 483 reg_val = DIV_ROUND_CLOSEST(act_time_ms * 1000, scale_factor); 484 485 /* TIME_ACT register is 8 bits wide */ 486 if (reg_val > 0xFF) 487 reg_val = 0xFF; 488 489 ret = regmap_write(st->regmap, ADXL372_TIME_ACT, reg_val); 490 if (ret < 0) 491 return ret; 492 493 st->act_time_ms = act_time_ms; 494 495 return ret; 496 } 497 adxl372_set_inactivity_time_ms(struct adxl372_state * st,unsigned int inact_time_ms)498 static int adxl372_set_inactivity_time_ms(struct adxl372_state *st, 499 unsigned int inact_time_ms) 500 { 501 unsigned int reg_val_h, reg_val_l, res, scale_factor; 502 int ret; 503 504 /* 505 * 13 ms per code is the scale factor of the TIME_INACT register for 506 * ODR = 6400 Hz. It is 26 ms per code for ODR = 3200 Hz and below. 507 */ 508 if (st->odr == ADXL372_ODR_6400HZ) 509 scale_factor = 13; 510 else 511 scale_factor = 26; 512 513 res = DIV_ROUND_CLOSEST(inact_time_ms, scale_factor); 514 reg_val_h = (res >> 8) & 0xFF; 515 reg_val_l = res & 0xFF; 516 517 ret = regmap_write(st->regmap, ADXL372_TIME_INACT_H, reg_val_h); 518 if (ret < 0) 519 return ret; 520 521 ret = regmap_write(st->regmap, ADXL372_TIME_INACT_L, reg_val_l); 522 if (ret < 0) 523 return ret; 524 525 st->inact_time_ms = inact_time_ms; 526 527 return ret; 528 } 529 adxl372_set_interrupts(struct adxl372_state * st,unsigned long int1_bitmask,unsigned long int2_bitmask)530 static int adxl372_set_interrupts(struct adxl372_state *st, 531 unsigned long int1_bitmask, 532 unsigned long int2_bitmask) 533 { 534 int ret; 535 536 ret = regmap_write(st->regmap, ADXL372_INT1_MAP, int1_bitmask); 537 if (ret < 0) 538 return ret; 539 540 return regmap_write(st->regmap, ADXL372_INT2_MAP, int2_bitmask); 541 } 542 adxl372_configure_fifo(struct adxl372_state * st)543 static int adxl372_configure_fifo(struct adxl372_state *st) 544 { 545 unsigned int fifo_samples, fifo_ctl; 546 int ret; 547 548 /* FIFO must be configured while in standby mode */ 549 ret = adxl372_set_op_mode(st, ADXL372_STANDBY); 550 if (ret < 0) 551 return ret; 552 553 /* 554 * watermark stores the number of sets; we need to write the FIFO 555 * registers with the number of samples 556 */ 557 fifo_samples = (st->watermark * st->fifo_set_size); 558 fifo_ctl = ADXL372_FIFO_CTL_FORMAT_MODE(st->fifo_format) | 559 ADXL372_FIFO_CTL_MODE_MODE(st->fifo_mode) | 560 ADXL372_FIFO_CTL_SAMPLES_MODE(fifo_samples); 561 562 ret = regmap_write(st->regmap, 563 ADXL372_FIFO_SAMPLES, fifo_samples & 0xFF); 564 if (ret < 0) 565 return ret; 566 567 ret = regmap_write(st->regmap, ADXL372_FIFO_CTL, fifo_ctl); 568 if (ret < 0) 569 return ret; 570 571 return adxl372_set_op_mode(st, ADXL372_FULL_BW_MEASUREMENT); 572 } 573 adxl372_get_status(struct adxl372_state * st,u8 * status1,u8 * status2,u16 * fifo_entries)574 static int adxl372_get_status(struct adxl372_state *st, 575 u8 *status1, u8 *status2, 576 u16 *fifo_entries) 577 { 578 __be32 buf; 579 u32 val; 580 int ret; 581 582 /* STATUS1, STATUS2, FIFO_ENTRIES2 and FIFO_ENTRIES are adjacent regs */ 583 ret = regmap_bulk_read(st->regmap, ADXL372_STATUS_1, 584 &buf, sizeof(buf)); 585 if (ret < 0) 586 return ret; 587 588 val = be32_to_cpu(buf); 589 590 *status1 = (val >> 24) & 0x0F; 591 *status2 = (val >> 16) & 0x0F; 592 /* 593 * FIFO_ENTRIES contains the least significant byte, and FIFO_ENTRIES2 594 * contains the two most significant bits 595 */ 596 *fifo_entries = val & 0x3FF; 597 598 return ret; 599 } 600 adxl372_arrange_axis_data(struct adxl372_state * st,__be16 * sample)601 static void adxl372_arrange_axis_data(struct adxl372_state *st, __be16 *sample) 602 { 603 __be16 axis_sample[3]; 604 int i = 0; 605 606 memset(axis_sample, 0, 3 * sizeof(__be16)); 607 if (ADXL372_X_AXIS_EN(st->fifo_axis_mask)) 608 axis_sample[i++] = sample[0]; 609 if (ADXL372_Y_AXIS_EN(st->fifo_axis_mask)) 610 axis_sample[i++] = sample[1]; 611 if (ADXL372_Z_AXIS_EN(st->fifo_axis_mask)) 612 axis_sample[i++] = sample[2]; 613 614 memcpy(sample, axis_sample, 3 * sizeof(__be16)); 615 } 616 adxl372_push_event(struct iio_dev * indio_dev,s64 timestamp,u8 status2)617 static void adxl372_push_event(struct iio_dev *indio_dev, s64 timestamp, u8 status2) 618 { 619 unsigned int ev_dir = IIO_EV_DIR_NONE; 620 621 if (ADXL372_STATUS_2_ACT(status2)) 622 ev_dir = IIO_EV_DIR_RISING; 623 624 if (ADXL372_STATUS_2_INACT(status2)) 625 ev_dir = IIO_EV_DIR_FALLING; 626 627 if (ev_dir != IIO_EV_DIR_NONE) 628 iio_push_event(indio_dev, 629 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X_OR_Y_OR_Z, 630 IIO_EV_TYPE_THRESH, ev_dir), 631 timestamp); 632 } 633 adxl372_trigger_handler(int irq,void * p)634 static irqreturn_t adxl372_trigger_handler(int irq, void *p) 635 { 636 struct iio_poll_func *pf = p; 637 struct iio_dev *indio_dev = pf->indio_dev; 638 struct adxl372_state *st = iio_priv(indio_dev); 639 u8 status1, status2; 640 u16 fifo_entries; 641 int i, ret; 642 643 ret = adxl372_get_status(st, &status1, &status2, &fifo_entries); 644 if (ret < 0) 645 goto err; 646 647 adxl372_push_event(indio_dev, iio_get_time_ns(indio_dev), status2); 648 649 if (st->fifo_mode != ADXL372_FIFO_BYPASSED && 650 ADXL372_STATUS_1_FIFO_FULL(status1)) { 651 /* 652 * When reading data from multiple axes from the FIFO, 653 * to ensure that data is not overwritten and stored out 654 * of order at least one sample set must be left in the 655 * FIFO after every read. 656 */ 657 fifo_entries -= st->fifo_set_size; 658 659 /* Read data from the FIFO */ 660 ret = regmap_noinc_read(st->regmap, ADXL372_FIFO_DATA, 661 st->fifo_buf, 662 fifo_entries * sizeof(u16)); 663 if (ret < 0) 664 goto err; 665 666 /* Each sample is 2 bytes */ 667 for (i = 0; i < fifo_entries; i += st->fifo_set_size) { 668 /* filter peak detection data */ 669 if (st->peak_fifo_mode_en) 670 adxl372_arrange_axis_data(st, &st->fifo_buf[i]); 671 iio_push_to_buffers(indio_dev, &st->fifo_buf[i]); 672 } 673 } 674 err: 675 iio_trigger_notify_done(indio_dev->trig); 676 return IRQ_HANDLED; 677 } 678 adxl372_setup(struct adxl372_state * st)679 static int adxl372_setup(struct adxl372_state *st) 680 { 681 unsigned int regval; 682 int ret; 683 684 ret = regmap_read(st->regmap, ADXL372_DEVID, ®val); 685 if (ret < 0) 686 return ret; 687 688 if (regval != ADXL372_DEVID_VAL) { 689 dev_err(st->dev, "Invalid chip id %x\n", regval); 690 return -ENODEV; 691 } 692 693 /* 694 * Perform a software reset to make sure the device is in a consistent 695 * state after start up. 696 */ 697 ret = regmap_write(st->regmap, ADXL372_RESET, ADXL372_RESET_CODE); 698 if (ret < 0) 699 return ret; 700 701 ret = adxl372_set_op_mode(st, ADXL372_STANDBY); 702 if (ret < 0) 703 return ret; 704 705 /* Set threshold for activity detection to 1g */ 706 ret = adxl372_set_activity_threshold(st, ADXL372_ACTIVITY, 707 true, true, 1000); 708 if (ret < 0) 709 return ret; 710 711 /* Set threshold for inactivity detection to 100mg */ 712 ret = adxl372_set_activity_threshold(st, ADXL372_INACTIVITY, 713 true, true, 100); 714 if (ret < 0) 715 return ret; 716 717 /* Set activity processing in Looped mode */ 718 ret = adxl372_set_act_proc_mode(st, ADXL372_LOOPED); 719 if (ret < 0) 720 return ret; 721 722 ret = adxl372_set_odr(st, ADXL372_ODR_6400HZ); 723 if (ret < 0) 724 return ret; 725 726 ret = adxl372_set_bandwidth(st, ADXL372_BW_3200HZ); 727 if (ret < 0) 728 return ret; 729 730 /* Set activity timer to 1ms */ 731 ret = adxl372_set_activity_time_ms(st, 1); 732 if (ret < 0) 733 return ret; 734 735 /* Set inactivity timer to 10s */ 736 ret = adxl372_set_inactivity_time_ms(st, 10000); 737 if (ret < 0) 738 return ret; 739 740 /* Set the mode of operation to full bandwidth measurement mode */ 741 return adxl372_set_op_mode(st, ADXL372_FULL_BW_MEASUREMENT); 742 } 743 adxl372_reg_access(struct iio_dev * indio_dev,unsigned int reg,unsigned int writeval,unsigned int * readval)744 static int adxl372_reg_access(struct iio_dev *indio_dev, 745 unsigned int reg, 746 unsigned int writeval, 747 unsigned int *readval) 748 { 749 struct adxl372_state *st = iio_priv(indio_dev); 750 751 if (readval) 752 return regmap_read(st->regmap, reg, readval); 753 else 754 return regmap_write(st->regmap, reg, writeval); 755 } 756 adxl372_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long info)757 static int adxl372_read_raw(struct iio_dev *indio_dev, 758 struct iio_chan_spec const *chan, 759 int *val, int *val2, long info) 760 { 761 struct adxl372_state *st = iio_priv(indio_dev); 762 int ret; 763 764 switch (info) { 765 case IIO_CHAN_INFO_RAW: 766 ret = iio_device_claim_direct_mode(indio_dev); 767 if (ret) 768 return ret; 769 770 ret = adxl372_read_axis(st, chan->address); 771 iio_device_release_direct_mode(indio_dev); 772 if (ret < 0) 773 return ret; 774 775 *val = sign_extend32(ret >> chan->scan_type.shift, 776 chan->scan_type.realbits - 1); 777 return IIO_VAL_INT; 778 case IIO_CHAN_INFO_SCALE: 779 *val = 0; 780 *val2 = ADXL372_USCALE; 781 return IIO_VAL_INT_PLUS_MICRO; 782 case IIO_CHAN_INFO_SAMP_FREQ: 783 *val = adxl372_samp_freq_tbl[st->odr]; 784 return IIO_VAL_INT; 785 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 786 *val = adxl372_bw_freq_tbl[st->bw]; 787 return IIO_VAL_INT; 788 } 789 790 return -EINVAL; 791 } 792 adxl372_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long info)793 static int adxl372_write_raw(struct iio_dev *indio_dev, 794 struct iio_chan_spec const *chan, 795 int val, int val2, long info) 796 { 797 struct adxl372_state *st = iio_priv(indio_dev); 798 int odr_index, bw_index, ret; 799 800 switch (info) { 801 case IIO_CHAN_INFO_SAMP_FREQ: 802 odr_index = adxl372_find_closest_match(adxl372_samp_freq_tbl, 803 ARRAY_SIZE(adxl372_samp_freq_tbl), 804 val); 805 ret = adxl372_set_odr(st, odr_index); 806 if (ret < 0) 807 return ret; 808 /* 809 * The timer period depends on the ODR selected. 810 * At 3200 Hz and below, it is 6.6 ms; at 6400 Hz, it is 3.3 ms 811 */ 812 ret = adxl372_set_activity_time_ms(st, st->act_time_ms); 813 if (ret < 0) 814 return ret; 815 /* 816 * The timer period depends on the ODR selected. 817 * At 3200 Hz and below, it is 26 ms; at 6400 Hz, it is 13 ms 818 */ 819 ret = adxl372_set_inactivity_time_ms(st, st->inact_time_ms); 820 if (ret < 0) 821 return ret; 822 /* 823 * The maximum bandwidth is constrained to at most half of 824 * the ODR to ensure that the Nyquist criteria is not violated 825 */ 826 if (st->bw > odr_index) 827 ret = adxl372_set_bandwidth(st, odr_index); 828 829 return ret; 830 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 831 bw_index = adxl372_find_closest_match(adxl372_bw_freq_tbl, 832 ARRAY_SIZE(adxl372_bw_freq_tbl), 833 val); 834 return adxl372_set_bandwidth(st, bw_index); 835 default: 836 return -EINVAL; 837 } 838 } 839 adxl372_read_event_value(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int * val,int * val2)840 static int adxl372_read_event_value(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, 841 enum iio_event_type type, enum iio_event_direction dir, 842 enum iio_event_info info, int *val, int *val2) 843 { 844 struct adxl372_state *st = iio_priv(indio_dev); 845 unsigned int addr; 846 u16 raw_value; 847 int ret; 848 849 switch (info) { 850 case IIO_EV_INFO_VALUE: 851 switch (dir) { 852 case IIO_EV_DIR_RISING: 853 addr = ADXL372_X_THRESH_ACT_H + 2 * chan->scan_index; 854 ret = adxl372_read_threshold_value(indio_dev, addr, &raw_value); 855 if (ret < 0) 856 return ret; 857 *val = raw_value * ADXL372_USCALE; 858 *val2 = 1000000; 859 return IIO_VAL_FRACTIONAL; 860 case IIO_EV_DIR_FALLING: 861 addr = ADXL372_X_THRESH_INACT_H + 2 * chan->scan_index; 862 ret = adxl372_read_threshold_value(indio_dev, addr, &raw_value); 863 if (ret < 0) 864 return ret; 865 *val = raw_value * ADXL372_USCALE; 866 *val2 = 1000000; 867 return IIO_VAL_FRACTIONAL; 868 default: 869 return -EINVAL; 870 } 871 case IIO_EV_INFO_PERIOD: 872 switch (dir) { 873 case IIO_EV_DIR_RISING: 874 *val = st->act_time_ms; 875 *val2 = 1000; 876 return IIO_VAL_FRACTIONAL; 877 case IIO_EV_DIR_FALLING: 878 *val = st->inact_time_ms; 879 *val2 = 1000; 880 return IIO_VAL_FRACTIONAL; 881 default: 882 return -EINVAL; 883 } 884 default: 885 return -EINVAL; 886 } 887 } 888 adxl372_write_event_value(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int val,int val2)889 static int adxl372_write_event_value(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, 890 enum iio_event_type type, enum iio_event_direction dir, 891 enum iio_event_info info, int val, int val2) 892 { 893 struct adxl372_state *st = iio_priv(indio_dev); 894 unsigned int val_ms; 895 unsigned int addr; 896 u16 raw_val; 897 898 switch (info) { 899 case IIO_EV_INFO_VALUE: 900 raw_val = DIV_ROUND_UP(val * 1000000, ADXL372_USCALE); 901 switch (dir) { 902 case IIO_EV_DIR_RISING: 903 addr = ADXL372_X_THRESH_ACT_H + 2 * chan->scan_index; 904 return adxl372_write_threshold_value(indio_dev, addr, raw_val); 905 case IIO_EV_DIR_FALLING: 906 addr = ADXL372_X_THRESH_INACT_H + 2 * chan->scan_index; 907 return adxl372_write_threshold_value(indio_dev, addr, raw_val); 908 default: 909 return -EINVAL; 910 } 911 case IIO_EV_INFO_PERIOD: 912 val_ms = val * 1000 + DIV_ROUND_UP(val2, 1000); 913 switch (dir) { 914 case IIO_EV_DIR_RISING: 915 return adxl372_set_activity_time_ms(st, val_ms); 916 case IIO_EV_DIR_FALLING: 917 return adxl372_set_inactivity_time_ms(st, val_ms); 918 default: 919 return -EINVAL; 920 } 921 default: 922 return -EINVAL; 923 } 924 } 925 adxl372_read_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir)926 static int adxl372_read_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, 927 enum iio_event_type type, enum iio_event_direction dir) 928 { 929 struct adxl372_state *st = iio_priv(indio_dev); 930 931 switch (dir) { 932 case IIO_EV_DIR_RISING: 933 return FIELD_GET(ADXL372_INT1_MAP_ACT_MSK, st->int1_bitmask); 934 case IIO_EV_DIR_FALLING: 935 return FIELD_GET(ADXL372_INT1_MAP_INACT_MSK, st->int1_bitmask); 936 default: 937 return -EINVAL; 938 } 939 } 940 adxl372_write_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,int state)941 static int adxl372_write_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, 942 enum iio_event_type type, enum iio_event_direction dir, 943 int state) 944 { 945 struct adxl372_state *st = iio_priv(indio_dev); 946 947 switch (dir) { 948 case IIO_EV_DIR_RISING: 949 set_mask_bits(&st->int1_bitmask, ADXL372_INT1_MAP_ACT_MSK, 950 ADXL372_INT1_MAP_ACT_MODE(state)); 951 break; 952 case IIO_EV_DIR_FALLING: 953 set_mask_bits(&st->int1_bitmask, ADXL372_INT1_MAP_INACT_MSK, 954 ADXL372_INT1_MAP_INACT_MODE(state)); 955 break; 956 default: 957 return -EINVAL; 958 } 959 960 return adxl372_set_interrupts(st, st->int1_bitmask, 0); 961 } 962 adxl372_show_filter_freq_avail(struct device * dev,struct device_attribute * attr,char * buf)963 static ssize_t adxl372_show_filter_freq_avail(struct device *dev, 964 struct device_attribute *attr, 965 char *buf) 966 { 967 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 968 struct adxl372_state *st = iio_priv(indio_dev); 969 int i; 970 size_t len = 0; 971 972 for (i = 0; i <= st->odr; i++) 973 len += scnprintf(buf + len, PAGE_SIZE - len, 974 "%d ", adxl372_bw_freq_tbl[i]); 975 976 buf[len - 1] = '\n'; 977 978 return len; 979 } 980 adxl372_get_fifo_enabled(struct device * dev,struct device_attribute * attr,char * buf)981 static ssize_t adxl372_get_fifo_enabled(struct device *dev, 982 struct device_attribute *attr, 983 char *buf) 984 { 985 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 986 struct adxl372_state *st = iio_priv(indio_dev); 987 988 return sprintf(buf, "%d\n", st->fifo_mode); 989 } 990 adxl372_get_fifo_watermark(struct device * dev,struct device_attribute * attr,char * buf)991 static ssize_t adxl372_get_fifo_watermark(struct device *dev, 992 struct device_attribute *attr, 993 char *buf) 994 { 995 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 996 struct adxl372_state *st = iio_priv(indio_dev); 997 998 return sprintf(buf, "%d\n", st->watermark); 999 } 1000 1001 IIO_STATIC_CONST_DEVICE_ATTR(hwfifo_watermark_min, "1"); 1002 IIO_STATIC_CONST_DEVICE_ATTR(hwfifo_watermark_max, 1003 __stringify(ADXL372_FIFO_SIZE)); 1004 static IIO_DEVICE_ATTR(hwfifo_watermark, 0444, 1005 adxl372_get_fifo_watermark, NULL, 0); 1006 static IIO_DEVICE_ATTR(hwfifo_enabled, 0444, 1007 adxl372_get_fifo_enabled, NULL, 0); 1008 1009 static const struct iio_dev_attr *adxl372_fifo_attributes[] = { 1010 &iio_dev_attr_hwfifo_watermark_min, 1011 &iio_dev_attr_hwfifo_watermark_max, 1012 &iio_dev_attr_hwfifo_watermark, 1013 &iio_dev_attr_hwfifo_enabled, 1014 NULL, 1015 }; 1016 adxl372_set_watermark(struct iio_dev * indio_dev,unsigned int val)1017 static int adxl372_set_watermark(struct iio_dev *indio_dev, unsigned int val) 1018 { 1019 struct adxl372_state *st = iio_priv(indio_dev); 1020 1021 if (val > ADXL372_FIFO_SIZE) 1022 val = ADXL372_FIFO_SIZE; 1023 1024 st->watermark = val; 1025 1026 return 0; 1027 } 1028 adxl372_buffer_postenable(struct iio_dev * indio_dev)1029 static int adxl372_buffer_postenable(struct iio_dev *indio_dev) 1030 { 1031 struct adxl372_state *st = iio_priv(indio_dev); 1032 unsigned int mask; 1033 int i, ret; 1034 1035 st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK; 1036 ret = adxl372_set_interrupts(st, st->int1_bitmask, 0); 1037 if (ret < 0) 1038 return ret; 1039 1040 mask = *indio_dev->active_scan_mask; 1041 1042 for (i = 0; i < ARRAY_SIZE(adxl372_axis_lookup_table); i++) { 1043 if (mask == adxl372_axis_lookup_table[i].bits) 1044 break; 1045 } 1046 1047 if (i == ARRAY_SIZE(adxl372_axis_lookup_table)) 1048 return -EINVAL; 1049 1050 st->fifo_format = adxl372_axis_lookup_table[i].fifo_format; 1051 st->fifo_axis_mask = adxl372_axis_lookup_table[i].bits; 1052 st->fifo_set_size = bitmap_weight(indio_dev->active_scan_mask, 1053 iio_get_masklength(indio_dev)); 1054 1055 /* Configure the FIFO to store sets of impact event peak. */ 1056 if (st->peak_fifo_mode_en) { 1057 st->fifo_set_size = 3; 1058 st->fifo_format = ADXL372_XYZ_PEAK_FIFO; 1059 } 1060 1061 /* 1062 * The 512 FIFO samples can be allotted in several ways, such as: 1063 * 170 sample sets of concurrent 3-axis data 1064 * 256 sample sets of concurrent 2-axis data (user selectable) 1065 * 512 sample sets of single-axis data 1066 * 170 sets of impact event peak (x, y, z) 1067 */ 1068 if ((st->watermark * st->fifo_set_size) > ADXL372_FIFO_SIZE) 1069 st->watermark = (ADXL372_FIFO_SIZE / st->fifo_set_size); 1070 1071 st->fifo_mode = ADXL372_FIFO_STREAMED; 1072 1073 ret = adxl372_configure_fifo(st); 1074 if (ret < 0) { 1075 st->fifo_mode = ADXL372_FIFO_BYPASSED; 1076 st->int1_bitmask &= ~ADXL372_INT1_MAP_FIFO_FULL_MSK; 1077 adxl372_set_interrupts(st, st->int1_bitmask, 0); 1078 return ret; 1079 } 1080 1081 return 0; 1082 } 1083 adxl372_buffer_predisable(struct iio_dev * indio_dev)1084 static int adxl372_buffer_predisable(struct iio_dev *indio_dev) 1085 { 1086 struct adxl372_state *st = iio_priv(indio_dev); 1087 1088 st->int1_bitmask &= ~ADXL372_INT1_MAP_FIFO_FULL_MSK; 1089 adxl372_set_interrupts(st, st->int1_bitmask, 0); 1090 st->fifo_mode = ADXL372_FIFO_BYPASSED; 1091 adxl372_configure_fifo(st); 1092 1093 return 0; 1094 } 1095 1096 static const struct iio_buffer_setup_ops adxl372_buffer_ops = { 1097 .postenable = adxl372_buffer_postenable, 1098 .predisable = adxl372_buffer_predisable, 1099 }; 1100 adxl372_dready_trig_set_state(struct iio_trigger * trig,bool state)1101 static int adxl372_dready_trig_set_state(struct iio_trigger *trig, 1102 bool state) 1103 { 1104 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 1105 struct adxl372_state *st = iio_priv(indio_dev); 1106 1107 if (state) 1108 st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK; 1109 1110 return adxl372_set_interrupts(st, st->int1_bitmask, 0); 1111 } 1112 adxl372_validate_trigger(struct iio_dev * indio_dev,struct iio_trigger * trig)1113 static int adxl372_validate_trigger(struct iio_dev *indio_dev, 1114 struct iio_trigger *trig) 1115 { 1116 struct adxl372_state *st = iio_priv(indio_dev); 1117 1118 if (st->dready_trig != trig && st->peak_datardy_trig != trig) 1119 return -EINVAL; 1120 1121 return 0; 1122 } 1123 1124 static const struct iio_trigger_ops adxl372_trigger_ops = { 1125 .validate_device = &iio_trigger_validate_own_device, 1126 .set_trigger_state = adxl372_dready_trig_set_state, 1127 }; 1128 adxl372_peak_dready_trig_set_state(struct iio_trigger * trig,bool state)1129 static int adxl372_peak_dready_trig_set_state(struct iio_trigger *trig, 1130 bool state) 1131 { 1132 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 1133 struct adxl372_state *st = iio_priv(indio_dev); 1134 1135 if (state) 1136 st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK; 1137 1138 st->peak_fifo_mode_en = state; 1139 1140 return adxl372_set_interrupts(st, st->int1_bitmask, 0); 1141 } 1142 1143 static const struct iio_trigger_ops adxl372_peak_data_trigger_ops = { 1144 .validate_device = &iio_trigger_validate_own_device, 1145 .set_trigger_state = adxl372_peak_dready_trig_set_state, 1146 }; 1147 1148 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("400 800 1600 3200 6400"); 1149 static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available, 1150 0444, adxl372_show_filter_freq_avail, NULL, 0); 1151 1152 static struct attribute *adxl372_attributes[] = { 1153 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 1154 &iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr, 1155 NULL, 1156 }; 1157 1158 static const struct attribute_group adxl372_attrs_group = { 1159 .attrs = adxl372_attributes, 1160 }; 1161 1162 static const struct iio_info adxl372_info = { 1163 .validate_trigger = &adxl372_validate_trigger, 1164 .attrs = &adxl372_attrs_group, 1165 .read_raw = adxl372_read_raw, 1166 .write_raw = adxl372_write_raw, 1167 .read_event_config = adxl372_read_event_config, 1168 .write_event_config = adxl372_write_event_config, 1169 .read_event_value = adxl372_read_event_value, 1170 .write_event_value = adxl372_write_event_value, 1171 .debugfs_reg_access = &adxl372_reg_access, 1172 .hwfifo_set_watermark = adxl372_set_watermark, 1173 }; 1174 adxl372_readable_noinc_reg(struct device * dev,unsigned int reg)1175 bool adxl372_readable_noinc_reg(struct device *dev, unsigned int reg) 1176 { 1177 return (reg == ADXL372_FIFO_DATA); 1178 } 1179 EXPORT_SYMBOL_NS_GPL(adxl372_readable_noinc_reg, IIO_ADXL372); 1180 adxl372_probe(struct device * dev,struct regmap * regmap,int irq,const char * name)1181 int adxl372_probe(struct device *dev, struct regmap *regmap, 1182 int irq, const char *name) 1183 { 1184 struct iio_dev *indio_dev; 1185 struct adxl372_state *st; 1186 int ret; 1187 1188 indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); 1189 if (!indio_dev) 1190 return -ENOMEM; 1191 1192 st = iio_priv(indio_dev); 1193 dev_set_drvdata(dev, indio_dev); 1194 1195 st->dev = dev; 1196 st->regmap = regmap; 1197 st->irq = irq; 1198 1199 mutex_init(&st->threshold_m); 1200 1201 indio_dev->channels = adxl372_channels; 1202 indio_dev->num_channels = ARRAY_SIZE(adxl372_channels); 1203 indio_dev->available_scan_masks = adxl372_channel_masks; 1204 indio_dev->name = name; 1205 indio_dev->info = &adxl372_info; 1206 indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE; 1207 1208 ret = adxl372_setup(st); 1209 if (ret < 0) { 1210 dev_err(dev, "ADXL372 setup failed\n"); 1211 return ret; 1212 } 1213 1214 ret = devm_iio_triggered_buffer_setup_ext(dev, 1215 indio_dev, NULL, 1216 adxl372_trigger_handler, 1217 IIO_BUFFER_DIRECTION_IN, 1218 &adxl372_buffer_ops, 1219 adxl372_fifo_attributes); 1220 if (ret < 0) 1221 return ret; 1222 1223 if (st->irq) { 1224 st->dready_trig = devm_iio_trigger_alloc(dev, 1225 "%s-dev%d", 1226 indio_dev->name, 1227 iio_device_id(indio_dev)); 1228 if (st->dready_trig == NULL) 1229 return -ENOMEM; 1230 1231 st->peak_datardy_trig = devm_iio_trigger_alloc(dev, 1232 "%s-dev%d-peak", 1233 indio_dev->name, 1234 iio_device_id(indio_dev)); 1235 if (!st->peak_datardy_trig) 1236 return -ENOMEM; 1237 1238 st->dready_trig->ops = &adxl372_trigger_ops; 1239 st->peak_datardy_trig->ops = &adxl372_peak_data_trigger_ops; 1240 iio_trigger_set_drvdata(st->dready_trig, indio_dev); 1241 iio_trigger_set_drvdata(st->peak_datardy_trig, indio_dev); 1242 ret = devm_iio_trigger_register(dev, st->dready_trig); 1243 if (ret < 0) 1244 return ret; 1245 1246 ret = devm_iio_trigger_register(dev, st->peak_datardy_trig); 1247 if (ret < 0) 1248 return ret; 1249 1250 indio_dev->trig = iio_trigger_get(st->dready_trig); 1251 1252 ret = devm_request_threaded_irq(dev, st->irq, 1253 iio_trigger_generic_data_rdy_poll, 1254 NULL, 1255 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 1256 indio_dev->name, st->dready_trig); 1257 if (ret < 0) 1258 return ret; 1259 } 1260 1261 return devm_iio_device_register(dev, indio_dev); 1262 } 1263 EXPORT_SYMBOL_NS_GPL(adxl372_probe, IIO_ADXL372); 1264 1265 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>"); 1266 MODULE_DESCRIPTION("Analog Devices ADXL372 3-axis accelerometer driver"); 1267 MODULE_LICENSE("GPL"); 1268