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/bitops.h> 9 #include <linux/interrupt.h> 10 #include <linux/irq.h> 11 #include <linux/module.h> 12 #include <linux/regmap.h> 13 #include <linux/spi/spi.h> 14 15 #include <linux/iio/iio.h> 16 #include <linux/iio/sysfs.h> 17 #include <linux/iio/buffer.h> 18 #include <linux/iio/events.h> 19 #include <linux/iio/trigger.h> 20 #include <linux/iio/trigger_consumer.h> 21 #include <linux/iio/triggered_buffer.h> 22 23 #include "adxl372.h" 24 25 /* ADXL372 registers definition */ 26 #define ADXL372_DEVID 0x00 27 #define ADXL372_DEVID_MST 0x01 28 #define ADXL372_PARTID 0x02 29 #define ADXL372_STATUS_1 0x04 30 #define ADXL372_STATUS_2 0x05 31 #define ADXL372_FIFO_ENTRIES_2 0x06 32 #define ADXL372_FIFO_ENTRIES_1 0x07 33 #define ADXL372_X_DATA_H 0x08 34 #define ADXL372_X_DATA_L 0x09 35 #define ADXL372_Y_DATA_H 0x0A 36 #define ADXL372_Y_DATA_L 0x0B 37 #define ADXL372_Z_DATA_H 0x0C 38 #define ADXL372_Z_DATA_L 0x0D 39 #define ADXL372_X_MAXPEAK_H 0x15 40 #define ADXL372_X_MAXPEAK_L 0x16 41 #define ADXL372_Y_MAXPEAK_H 0x17 42 #define ADXL372_Y_MAXPEAK_L 0x18 43 #define ADXL372_Z_MAXPEAK_H 0x19 44 #define ADXL372_Z_MAXPEAK_L 0x1A 45 #define ADXL372_OFFSET_X 0x20 46 #define ADXL372_OFFSET_Y 0x21 47 #define ADXL372_OFFSET_Z 0x22 48 #define ADXL372_X_THRESH_ACT_H 0x23 49 #define ADXL372_X_THRESH_ACT_L 0x24 50 #define ADXL372_Y_THRESH_ACT_H 0x25 51 #define ADXL372_Y_THRESH_ACT_L 0x26 52 #define ADXL372_Z_THRESH_ACT_H 0x27 53 #define ADXL372_Z_THRESH_ACT_L 0x28 54 #define ADXL372_TIME_ACT 0x29 55 #define ADXL372_X_THRESH_INACT_H 0x2A 56 #define ADXL372_X_THRESH_INACT_L 0x2B 57 #define ADXL372_Y_THRESH_INACT_H 0x2C 58 #define ADXL372_Y_THRESH_INACT_L 0x2D 59 #define ADXL372_Z_THRESH_INACT_H 0x2E 60 #define ADXL372_Z_THRESH_INACT_L 0x2F 61 #define ADXL372_TIME_INACT_H 0x30 62 #define ADXL372_TIME_INACT_L 0x31 63 #define ADXL372_X_THRESH_ACT2_H 0x32 64 #define ADXL372_X_THRESH_ACT2_L 0x33 65 #define ADXL372_Y_THRESH_ACT2_H 0x34 66 #define ADXL372_Y_THRESH_ACT2_L 0x35 67 #define ADXL372_Z_THRESH_ACT2_H 0x36 68 #define ADXL372_Z_THRESH_ACT2_L 0x37 69 #define ADXL372_HPF 0x38 70 #define ADXL372_FIFO_SAMPLES 0x39 71 #define ADXL372_FIFO_CTL 0x3A 72 #define ADXL372_INT1_MAP 0x3B 73 #define ADXL372_INT2_MAP 0x3C 74 #define ADXL372_TIMING 0x3D 75 #define ADXL372_MEASURE 0x3E 76 #define ADXL372_POWER_CTL 0x3F 77 #define ADXL372_SELF_TEST 0x40 78 #define ADXL372_RESET 0x41 79 #define ADXL372_FIFO_DATA 0x42 80 81 #define ADXL372_DEVID_VAL 0xAD 82 #define ADXL372_PARTID_VAL 0xFA 83 #define ADXL372_RESET_CODE 0x52 84 85 /* ADXL372_POWER_CTL */ 86 #define ADXL372_POWER_CTL_MODE_MSK GENMASK_ULL(1, 0) 87 #define ADXL372_POWER_CTL_MODE(x) (((x) & 0x3) << 0) 88 89 /* ADXL372_MEASURE */ 90 #define ADXL372_MEASURE_LINKLOOP_MSK GENMASK_ULL(5, 4) 91 #define ADXL372_MEASURE_LINKLOOP_MODE(x) (((x) & 0x3) << 4) 92 #define ADXL372_MEASURE_BANDWIDTH_MSK GENMASK_ULL(2, 0) 93 #define ADXL372_MEASURE_BANDWIDTH_MODE(x) (((x) & 0x7) << 0) 94 95 /* ADXL372_TIMING */ 96 #define ADXL372_TIMING_ODR_MSK GENMASK_ULL(7, 5) 97 #define ADXL372_TIMING_ODR_MODE(x) (((x) & 0x7) << 5) 98 99 /* ADXL372_FIFO_CTL */ 100 #define ADXL372_FIFO_CTL_FORMAT_MSK GENMASK(5, 3) 101 #define ADXL372_FIFO_CTL_FORMAT_MODE(x) (((x) & 0x7) << 3) 102 #define ADXL372_FIFO_CTL_MODE_MSK GENMASK(2, 1) 103 #define ADXL372_FIFO_CTL_MODE_MODE(x) (((x) & 0x3) << 1) 104 #define ADXL372_FIFO_CTL_SAMPLES_MSK BIT(1) 105 #define ADXL372_FIFO_CTL_SAMPLES_MODE(x) (((x) > 0xFF) ? 1 : 0) 106 107 /* ADXL372_STATUS_1 */ 108 #define ADXL372_STATUS_1_DATA_RDY(x) (((x) >> 0) & 0x1) 109 #define ADXL372_STATUS_1_FIFO_RDY(x) (((x) >> 1) & 0x1) 110 #define ADXL372_STATUS_1_FIFO_FULL(x) (((x) >> 2) & 0x1) 111 #define ADXL372_STATUS_1_FIFO_OVR(x) (((x) >> 3) & 0x1) 112 #define ADXL372_STATUS_1_USR_NVM_BUSY(x) (((x) >> 5) & 0x1) 113 #define ADXL372_STATUS_1_AWAKE(x) (((x) >> 6) & 0x1) 114 #define ADXL372_STATUS_1_ERR_USR_REGS(x) (((x) >> 7) & 0x1) 115 116 /* ADXL372_INT1_MAP */ 117 #define ADXL372_INT1_MAP_DATA_RDY_MSK BIT(0) 118 #define ADXL372_INT1_MAP_DATA_RDY_MODE(x) (((x) & 0x1) << 0) 119 #define ADXL372_INT1_MAP_FIFO_RDY_MSK BIT(1) 120 #define ADXL372_INT1_MAP_FIFO_RDY_MODE(x) (((x) & 0x1) << 1) 121 #define ADXL372_INT1_MAP_FIFO_FULL_MSK BIT(2) 122 #define ADXL372_INT1_MAP_FIFO_FULL_MODE(x) (((x) & 0x1) << 2) 123 #define ADXL372_INT1_MAP_FIFO_OVR_MSK BIT(3) 124 #define ADXL372_INT1_MAP_FIFO_OVR_MODE(x) (((x) & 0x1) << 3) 125 #define ADXL372_INT1_MAP_INACT_MSK BIT(4) 126 #define ADXL372_INT1_MAP_INACT_MODE(x) (((x) & 0x1) << 4) 127 #define ADXL372_INT1_MAP_ACT_MSK BIT(5) 128 #define ADXL372_INT1_MAP_ACT_MODE(x) (((x) & 0x1) << 5) 129 #define ADXL372_INT1_MAP_AWAKE_MSK BIT(6) 130 #define ADXL372_INT1_MAP_AWAKE_MODE(x) (((x) & 0x1) << 6) 131 #define ADXL372_INT1_MAP_LOW_MSK BIT(7) 132 #define ADXL372_INT1_MAP_LOW_MODE(x) (((x) & 0x1) << 7) 133 134 /* The ADXL372 includes a deep, 512 sample FIFO buffer */ 135 #define ADXL372_FIFO_SIZE 512 136 137 /* 138 * At +/- 200g with 12-bit resolution, scale is computed as: 139 * (200 + 200) * 9.81 / (2^12 - 1) = 0.958241 140 */ 141 #define ADXL372_USCALE 958241 142 143 enum adxl372_op_mode { 144 ADXL372_STANDBY, 145 ADXL372_WAKE_UP, 146 ADXL372_INSTANT_ON, 147 ADXL372_FULL_BW_MEASUREMENT, 148 }; 149 150 enum adxl372_act_proc_mode { 151 ADXL372_DEFAULT, 152 ADXL372_LINKED, 153 ADXL372_LOOPED, 154 }; 155 156 enum adxl372_th_activity { 157 ADXL372_ACTIVITY, 158 ADXL372_ACTIVITY2, 159 ADXL372_INACTIVITY, 160 }; 161 162 enum adxl372_odr { 163 ADXL372_ODR_400HZ, 164 ADXL372_ODR_800HZ, 165 ADXL372_ODR_1600HZ, 166 ADXL372_ODR_3200HZ, 167 ADXL372_ODR_6400HZ, 168 }; 169 170 enum adxl372_bandwidth { 171 ADXL372_BW_200HZ, 172 ADXL372_BW_400HZ, 173 ADXL372_BW_800HZ, 174 ADXL372_BW_1600HZ, 175 ADXL372_BW_3200HZ, 176 }; 177 178 static const unsigned int adxl372_th_reg_high_addr[3] = { 179 [ADXL372_ACTIVITY] = ADXL372_X_THRESH_ACT_H, 180 [ADXL372_ACTIVITY2] = ADXL372_X_THRESH_ACT2_H, 181 [ADXL372_INACTIVITY] = ADXL372_X_THRESH_INACT_H, 182 }; 183 184 enum adxl372_fifo_format { 185 ADXL372_XYZ_FIFO, 186 ADXL372_X_FIFO, 187 ADXL372_Y_FIFO, 188 ADXL372_XY_FIFO, 189 ADXL372_Z_FIFO, 190 ADXL372_XZ_FIFO, 191 ADXL372_YZ_FIFO, 192 ADXL372_XYZ_PEAK_FIFO, 193 }; 194 195 enum adxl372_fifo_mode { 196 ADXL372_FIFO_BYPASSED, 197 ADXL372_FIFO_STREAMED, 198 ADXL372_FIFO_TRIGGERED, 199 ADXL372_FIFO_OLD_SAVED 200 }; 201 202 static const int adxl372_samp_freq_tbl[5] = { 203 400, 800, 1600, 3200, 6400, 204 }; 205 206 static const int adxl372_bw_freq_tbl[5] = { 207 200, 400, 800, 1600, 3200, 208 }; 209 210 struct adxl372_axis_lookup { 211 unsigned int bits; 212 enum adxl372_fifo_format fifo_format; 213 }; 214 215 static const struct adxl372_axis_lookup adxl372_axis_lookup_table[] = { 216 { BIT(0), ADXL372_X_FIFO }, 217 { BIT(1), ADXL372_Y_FIFO }, 218 { BIT(2), ADXL372_Z_FIFO }, 219 { BIT(0) | BIT(1), ADXL372_XY_FIFO }, 220 { BIT(0) | BIT(2), ADXL372_XZ_FIFO }, 221 { BIT(1) | BIT(2), ADXL372_YZ_FIFO }, 222 { BIT(0) | BIT(1) | BIT(2), ADXL372_XYZ_FIFO }, 223 }; 224 225 #define ADXL372_ACCEL_CHANNEL(index, reg, axis) { \ 226 .type = IIO_ACCEL, \ 227 .address = reg, \ 228 .modified = 1, \ 229 .channel2 = IIO_MOD_##axis, \ 230 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 231 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ 232 BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ 233 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ 234 .scan_index = index, \ 235 .scan_type = { \ 236 .sign = 's', \ 237 .realbits = 12, \ 238 .storagebits = 16, \ 239 .shift = 4, \ 240 }, \ 241 } 242 243 static const struct iio_chan_spec adxl372_channels[] = { 244 ADXL372_ACCEL_CHANNEL(0, ADXL372_X_DATA_H, X), 245 ADXL372_ACCEL_CHANNEL(1, ADXL372_Y_DATA_H, Y), 246 ADXL372_ACCEL_CHANNEL(2, ADXL372_Z_DATA_H, Z), 247 }; 248 249 struct adxl372_state { 250 int irq; 251 struct device *dev; 252 struct regmap *regmap; 253 struct iio_trigger *dready_trig; 254 enum adxl372_fifo_mode fifo_mode; 255 enum adxl372_fifo_format fifo_format; 256 enum adxl372_op_mode op_mode; 257 enum adxl372_act_proc_mode act_proc_mode; 258 enum adxl372_odr odr; 259 enum adxl372_bandwidth bw; 260 u32 act_time_ms; 261 u32 inact_time_ms; 262 u8 fifo_set_size; 263 u8 int1_bitmask; 264 u8 int2_bitmask; 265 u16 watermark; 266 __be16 fifo_buf[ADXL372_FIFO_SIZE]; 267 }; 268 269 static const unsigned long adxl372_channel_masks[] = { 270 BIT(0), BIT(1), BIT(2), 271 BIT(0) | BIT(1), 272 BIT(0) | BIT(2), 273 BIT(1) | BIT(2), 274 BIT(0) | BIT(1) | BIT(2), 275 0 276 }; 277 278 static int adxl372_read_axis(struct adxl372_state *st, u8 addr) 279 { 280 __be16 regval; 281 int ret; 282 283 ret = regmap_bulk_read(st->regmap, addr, ®val, sizeof(regval)); 284 if (ret < 0) 285 return ret; 286 287 return be16_to_cpu(regval); 288 } 289 290 static int adxl372_set_op_mode(struct adxl372_state *st, 291 enum adxl372_op_mode op_mode) 292 { 293 int ret; 294 295 ret = regmap_update_bits(st->regmap, ADXL372_POWER_CTL, 296 ADXL372_POWER_CTL_MODE_MSK, 297 ADXL372_POWER_CTL_MODE(op_mode)); 298 if (ret < 0) 299 return ret; 300 301 st->op_mode = op_mode; 302 303 return ret; 304 } 305 306 static int adxl372_set_odr(struct adxl372_state *st, 307 enum adxl372_odr odr) 308 { 309 int ret; 310 311 ret = regmap_update_bits(st->regmap, ADXL372_TIMING, 312 ADXL372_TIMING_ODR_MSK, 313 ADXL372_TIMING_ODR_MODE(odr)); 314 if (ret < 0) 315 return ret; 316 317 st->odr = odr; 318 319 return ret; 320 } 321 322 static int adxl372_find_closest_match(const int *array, 323 unsigned int size, int val) 324 { 325 int i; 326 327 for (i = 0; i < size; i++) { 328 if (val <= array[i]) 329 return i; 330 } 331 332 return size - 1; 333 } 334 335 static int adxl372_set_bandwidth(struct adxl372_state *st, 336 enum adxl372_bandwidth bw) 337 { 338 int ret; 339 340 ret = regmap_update_bits(st->regmap, ADXL372_MEASURE, 341 ADXL372_MEASURE_BANDWIDTH_MSK, 342 ADXL372_MEASURE_BANDWIDTH_MODE(bw)); 343 if (ret < 0) 344 return ret; 345 346 st->bw = bw; 347 348 return ret; 349 } 350 351 static int adxl372_set_act_proc_mode(struct adxl372_state *st, 352 enum adxl372_act_proc_mode mode) 353 { 354 int ret; 355 356 ret = regmap_update_bits(st->regmap, 357 ADXL372_MEASURE, 358 ADXL372_MEASURE_LINKLOOP_MSK, 359 ADXL372_MEASURE_LINKLOOP_MODE(mode)); 360 if (ret < 0) 361 return ret; 362 363 st->act_proc_mode = mode; 364 365 return ret; 366 } 367 368 static int adxl372_set_activity_threshold(struct adxl372_state *st, 369 enum adxl372_th_activity act, 370 bool ref_en, bool enable, 371 unsigned int threshold) 372 { 373 unsigned char buf[6]; 374 unsigned char th_reg_high_val, th_reg_low_val, th_reg_high_addr; 375 376 /* scale factor is 100 mg/code */ 377 th_reg_high_val = (threshold / 100) >> 3; 378 th_reg_low_val = ((threshold / 100) << 5) | (ref_en << 1) | enable; 379 th_reg_high_addr = adxl372_th_reg_high_addr[act]; 380 381 buf[0] = th_reg_high_val; 382 buf[1] = th_reg_low_val; 383 buf[2] = th_reg_high_val; 384 buf[3] = th_reg_low_val; 385 buf[4] = th_reg_high_val; 386 buf[5] = th_reg_low_val; 387 388 return regmap_bulk_write(st->regmap, th_reg_high_addr, 389 buf, ARRAY_SIZE(buf)); 390 } 391 392 static int adxl372_set_activity_time_ms(struct adxl372_state *st, 393 unsigned int act_time_ms) 394 { 395 unsigned int reg_val, scale_factor; 396 int ret; 397 398 /* 399 * 3.3 ms per code is the scale factor of the TIME_ACT register for 400 * ODR = 6400 Hz. It is 6.6 ms per code for ODR = 3200 Hz and below. 401 */ 402 if (st->odr == ADXL372_ODR_6400HZ) 403 scale_factor = 3300; 404 else 405 scale_factor = 6600; 406 407 reg_val = DIV_ROUND_CLOSEST(act_time_ms * 1000, scale_factor); 408 409 /* TIME_ACT register is 8 bits wide */ 410 if (reg_val > 0xFF) 411 reg_val = 0xFF; 412 413 ret = regmap_write(st->regmap, ADXL372_TIME_ACT, reg_val); 414 if (ret < 0) 415 return ret; 416 417 st->act_time_ms = act_time_ms; 418 419 return ret; 420 } 421 422 static int adxl372_set_inactivity_time_ms(struct adxl372_state *st, 423 unsigned int inact_time_ms) 424 { 425 unsigned int reg_val_h, reg_val_l, res, scale_factor; 426 int ret; 427 428 /* 429 * 13 ms per code is the scale factor of the TIME_INACT register for 430 * ODR = 6400 Hz. It is 26 ms per code for ODR = 3200 Hz and below. 431 */ 432 if (st->odr == ADXL372_ODR_6400HZ) 433 scale_factor = 13; 434 else 435 scale_factor = 26; 436 437 res = DIV_ROUND_CLOSEST(inact_time_ms, scale_factor); 438 reg_val_h = (res >> 8) & 0xFF; 439 reg_val_l = res & 0xFF; 440 441 ret = regmap_write(st->regmap, ADXL372_TIME_INACT_H, reg_val_h); 442 if (ret < 0) 443 return ret; 444 445 ret = regmap_write(st->regmap, ADXL372_TIME_INACT_L, reg_val_l); 446 if (ret < 0) 447 return ret; 448 449 st->inact_time_ms = inact_time_ms; 450 451 return ret; 452 } 453 454 static int adxl372_set_interrupts(struct adxl372_state *st, 455 unsigned char int1_bitmask, 456 unsigned char int2_bitmask) 457 { 458 int ret; 459 460 ret = regmap_write(st->regmap, ADXL372_INT1_MAP, int1_bitmask); 461 if (ret < 0) 462 return ret; 463 464 return regmap_write(st->regmap, ADXL372_INT2_MAP, int2_bitmask); 465 } 466 467 static int adxl372_configure_fifo(struct adxl372_state *st) 468 { 469 unsigned int fifo_samples, fifo_ctl; 470 int ret; 471 472 /* FIFO must be configured while in standby mode */ 473 ret = adxl372_set_op_mode(st, ADXL372_STANDBY); 474 if (ret < 0) 475 return ret; 476 477 fifo_samples = st->watermark & 0xFF; 478 fifo_ctl = ADXL372_FIFO_CTL_FORMAT_MODE(st->fifo_format) | 479 ADXL372_FIFO_CTL_MODE_MODE(st->fifo_mode) | 480 ADXL372_FIFO_CTL_SAMPLES_MODE(st->watermark); 481 482 ret = regmap_write(st->regmap, ADXL372_FIFO_SAMPLES, fifo_samples); 483 if (ret < 0) 484 return ret; 485 486 ret = regmap_write(st->regmap, ADXL372_FIFO_CTL, fifo_ctl); 487 if (ret < 0) 488 return ret; 489 490 return adxl372_set_op_mode(st, ADXL372_FULL_BW_MEASUREMENT); 491 } 492 493 static int adxl372_get_status(struct adxl372_state *st, 494 u8 *status1, u8 *status2, 495 u16 *fifo_entries) 496 { 497 __be32 buf; 498 u32 val; 499 int ret; 500 501 /* STATUS1, STATUS2, FIFO_ENTRIES2 and FIFO_ENTRIES are adjacent regs */ 502 ret = regmap_bulk_read(st->regmap, ADXL372_STATUS_1, 503 &buf, sizeof(buf)); 504 if (ret < 0) 505 return ret; 506 507 val = be32_to_cpu(buf); 508 509 *status1 = (val >> 24) & 0x0F; 510 *status2 = (val >> 16) & 0x0F; 511 /* 512 * FIFO_ENTRIES contains the least significant byte, and FIFO_ENTRIES2 513 * contains the two most significant bits 514 */ 515 *fifo_entries = val & 0x3FF; 516 517 return ret; 518 } 519 520 static irqreturn_t adxl372_trigger_handler(int irq, void *p) 521 { 522 struct iio_poll_func *pf = p; 523 struct iio_dev *indio_dev = pf->indio_dev; 524 struct adxl372_state *st = iio_priv(indio_dev); 525 u8 status1, status2; 526 u16 fifo_entries; 527 int i, ret; 528 529 ret = adxl372_get_status(st, &status1, &status2, &fifo_entries); 530 if (ret < 0) 531 goto err; 532 533 if (st->fifo_mode != ADXL372_FIFO_BYPASSED && 534 ADXL372_STATUS_1_FIFO_FULL(status1)) { 535 /* 536 * When reading data from multiple axes from the FIFO, 537 * to ensure that data is not overwritten and stored out 538 * of order at least one sample set must be left in the 539 * FIFO after every read. 540 */ 541 fifo_entries -= st->fifo_set_size; 542 543 /* Read data from the FIFO */ 544 ret = regmap_noinc_read(st->regmap, ADXL372_FIFO_DATA, 545 st->fifo_buf, 546 fifo_entries * sizeof(u16)); 547 if (ret < 0) 548 goto err; 549 550 /* Each sample is 2 bytes */ 551 for (i = 0; i < fifo_entries * sizeof(u16); 552 i += st->fifo_set_size * sizeof(u16)) 553 iio_push_to_buffers(indio_dev, &st->fifo_buf[i]); 554 } 555 err: 556 iio_trigger_notify_done(indio_dev->trig); 557 return IRQ_HANDLED; 558 } 559 560 static int adxl372_setup(struct adxl372_state *st) 561 { 562 unsigned int regval; 563 int ret; 564 565 ret = regmap_read(st->regmap, ADXL372_DEVID, ®val); 566 if (ret < 0) 567 return ret; 568 569 if (regval != ADXL372_DEVID_VAL) { 570 dev_err(st->dev, "Invalid chip id %x\n", regval); 571 return -ENODEV; 572 } 573 574 ret = adxl372_set_op_mode(st, ADXL372_STANDBY); 575 if (ret < 0) 576 return ret; 577 578 /* Set threshold for activity detection to 1g */ 579 ret = adxl372_set_activity_threshold(st, ADXL372_ACTIVITY, 580 true, true, 1000); 581 if (ret < 0) 582 return ret; 583 584 /* Set threshold for inactivity detection to 100mg */ 585 ret = adxl372_set_activity_threshold(st, ADXL372_INACTIVITY, 586 true, true, 100); 587 if (ret < 0) 588 return ret; 589 590 /* Set activity processing in Looped mode */ 591 ret = adxl372_set_act_proc_mode(st, ADXL372_LOOPED); 592 if (ret < 0) 593 return ret; 594 595 ret = adxl372_set_odr(st, ADXL372_ODR_6400HZ); 596 if (ret < 0) 597 return ret; 598 599 ret = adxl372_set_bandwidth(st, ADXL372_BW_3200HZ); 600 if (ret < 0) 601 return ret; 602 603 /* Set activity timer to 1ms */ 604 ret = adxl372_set_activity_time_ms(st, 1); 605 if (ret < 0) 606 return ret; 607 608 /* Set inactivity timer to 10s */ 609 ret = adxl372_set_inactivity_time_ms(st, 10000); 610 if (ret < 0) 611 return ret; 612 613 /* Set the mode of operation to full bandwidth measurement mode */ 614 return adxl372_set_op_mode(st, ADXL372_FULL_BW_MEASUREMENT); 615 } 616 617 static int adxl372_reg_access(struct iio_dev *indio_dev, 618 unsigned int reg, 619 unsigned int writeval, 620 unsigned int *readval) 621 { 622 struct adxl372_state *st = iio_priv(indio_dev); 623 624 if (readval) 625 return regmap_read(st->regmap, reg, readval); 626 else 627 return regmap_write(st->regmap, reg, writeval); 628 } 629 630 static int adxl372_read_raw(struct iio_dev *indio_dev, 631 struct iio_chan_spec const *chan, 632 int *val, int *val2, long info) 633 { 634 struct adxl372_state *st = iio_priv(indio_dev); 635 int ret; 636 637 switch (info) { 638 case IIO_CHAN_INFO_RAW: 639 ret = iio_device_claim_direct_mode(indio_dev); 640 if (ret) 641 return ret; 642 643 ret = adxl372_read_axis(st, chan->address); 644 iio_device_release_direct_mode(indio_dev); 645 if (ret < 0) 646 return ret; 647 648 *val = sign_extend32(ret >> chan->scan_type.shift, 649 chan->scan_type.realbits - 1); 650 return IIO_VAL_INT; 651 case IIO_CHAN_INFO_SCALE: 652 *val = 0; 653 *val2 = ADXL372_USCALE; 654 return IIO_VAL_INT_PLUS_MICRO; 655 case IIO_CHAN_INFO_SAMP_FREQ: 656 *val = adxl372_samp_freq_tbl[st->odr]; 657 return IIO_VAL_INT; 658 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 659 *val = adxl372_bw_freq_tbl[st->bw]; 660 return IIO_VAL_INT; 661 } 662 663 return -EINVAL; 664 } 665 666 static int adxl372_write_raw(struct iio_dev *indio_dev, 667 struct iio_chan_spec const *chan, 668 int val, int val2, long info) 669 { 670 struct adxl372_state *st = iio_priv(indio_dev); 671 int odr_index, bw_index, ret; 672 673 switch (info) { 674 case IIO_CHAN_INFO_SAMP_FREQ: 675 odr_index = adxl372_find_closest_match(adxl372_samp_freq_tbl, 676 ARRAY_SIZE(adxl372_samp_freq_tbl), 677 val); 678 ret = adxl372_set_odr(st, odr_index); 679 if (ret < 0) 680 return ret; 681 /* 682 * The timer period depends on the ODR selected. 683 * At 3200 Hz and below, it is 6.6 ms; at 6400 Hz, it is 3.3 ms 684 */ 685 ret = adxl372_set_activity_time_ms(st, st->act_time_ms); 686 if (ret < 0) 687 return ret; 688 /* 689 * The timer period depends on the ODR selected. 690 * At 3200 Hz and below, it is 26 ms; at 6400 Hz, it is 13 ms 691 */ 692 ret = adxl372_set_inactivity_time_ms(st, st->inact_time_ms); 693 if (ret < 0) 694 return ret; 695 /* 696 * The maximum bandwidth is constrained to at most half of 697 * the ODR to ensure that the Nyquist criteria is not violated 698 */ 699 if (st->bw > odr_index) 700 ret = adxl372_set_bandwidth(st, odr_index); 701 702 return ret; 703 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 704 bw_index = adxl372_find_closest_match(adxl372_bw_freq_tbl, 705 ARRAY_SIZE(adxl372_bw_freq_tbl), 706 val); 707 return adxl372_set_bandwidth(st, bw_index); 708 default: 709 return -EINVAL; 710 } 711 } 712 713 static ssize_t adxl372_show_filter_freq_avail(struct device *dev, 714 struct device_attribute *attr, 715 char *buf) 716 { 717 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 718 struct adxl372_state *st = iio_priv(indio_dev); 719 int i; 720 size_t len = 0; 721 722 for (i = 0; i <= st->odr; i++) 723 len += scnprintf(buf + len, PAGE_SIZE - len, 724 "%d ", adxl372_bw_freq_tbl[i]); 725 726 buf[len - 1] = '\n'; 727 728 return len; 729 } 730 731 static ssize_t adxl372_get_fifo_enabled(struct device *dev, 732 struct device_attribute *attr, 733 char *buf) 734 { 735 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 736 struct adxl372_state *st = iio_priv(indio_dev); 737 738 return sprintf(buf, "%d\n", st->fifo_mode); 739 } 740 741 static ssize_t adxl372_get_fifo_watermark(struct device *dev, 742 struct device_attribute *attr, 743 char *buf) 744 { 745 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 746 struct adxl372_state *st = iio_priv(indio_dev); 747 748 return sprintf(buf, "%d\n", st->watermark); 749 } 750 751 static IIO_CONST_ATTR(hwfifo_watermark_min, "1"); 752 static IIO_CONST_ATTR(hwfifo_watermark_max, 753 __stringify(ADXL372_FIFO_SIZE)); 754 static IIO_DEVICE_ATTR(hwfifo_watermark, 0444, 755 adxl372_get_fifo_watermark, NULL, 0); 756 static IIO_DEVICE_ATTR(hwfifo_enabled, 0444, 757 adxl372_get_fifo_enabled, NULL, 0); 758 759 static const struct attribute *adxl372_fifo_attributes[] = { 760 &iio_const_attr_hwfifo_watermark_min.dev_attr.attr, 761 &iio_const_attr_hwfifo_watermark_max.dev_attr.attr, 762 &iio_dev_attr_hwfifo_watermark.dev_attr.attr, 763 &iio_dev_attr_hwfifo_enabled.dev_attr.attr, 764 NULL, 765 }; 766 767 static int adxl372_set_watermark(struct iio_dev *indio_dev, unsigned int val) 768 { 769 struct adxl372_state *st = iio_priv(indio_dev); 770 771 if (val > ADXL372_FIFO_SIZE) 772 val = ADXL372_FIFO_SIZE; 773 774 st->watermark = val; 775 776 return 0; 777 } 778 779 static int adxl372_buffer_postenable(struct iio_dev *indio_dev) 780 { 781 struct adxl372_state *st = iio_priv(indio_dev); 782 unsigned int mask; 783 int i, ret; 784 785 ret = adxl372_set_interrupts(st, ADXL372_INT1_MAP_FIFO_FULL_MSK, 0); 786 if (ret < 0) 787 return ret; 788 789 mask = *indio_dev->active_scan_mask; 790 791 for (i = 0; i < ARRAY_SIZE(adxl372_axis_lookup_table); i++) { 792 if (mask == adxl372_axis_lookup_table[i].bits) 793 break; 794 } 795 796 if (i == ARRAY_SIZE(adxl372_axis_lookup_table)) 797 return -EINVAL; 798 799 st->fifo_format = adxl372_axis_lookup_table[i].fifo_format; 800 st->fifo_set_size = bitmap_weight(indio_dev->active_scan_mask, 801 indio_dev->masklength); 802 /* 803 * The 512 FIFO samples can be allotted in several ways, such as: 804 * 170 sample sets of concurrent 3-axis data 805 * 256 sample sets of concurrent 2-axis data (user selectable) 806 * 512 sample sets of single-axis data 807 */ 808 if ((st->watermark * st->fifo_set_size) > ADXL372_FIFO_SIZE) 809 st->watermark = (ADXL372_FIFO_SIZE / st->fifo_set_size); 810 811 st->fifo_mode = ADXL372_FIFO_STREAMED; 812 813 ret = adxl372_configure_fifo(st); 814 if (ret < 0) { 815 st->fifo_mode = ADXL372_FIFO_BYPASSED; 816 adxl372_set_interrupts(st, 0, 0); 817 return ret; 818 } 819 820 return iio_triggered_buffer_postenable(indio_dev); 821 } 822 823 static int adxl372_buffer_predisable(struct iio_dev *indio_dev) 824 { 825 struct adxl372_state *st = iio_priv(indio_dev); 826 int ret; 827 828 ret = iio_triggered_buffer_predisable(indio_dev); 829 if (ret < 0) 830 return ret; 831 832 adxl372_set_interrupts(st, 0, 0); 833 st->fifo_mode = ADXL372_FIFO_BYPASSED; 834 adxl372_configure_fifo(st); 835 836 return 0; 837 } 838 839 static const struct iio_buffer_setup_ops adxl372_buffer_ops = { 840 .postenable = adxl372_buffer_postenable, 841 .predisable = adxl372_buffer_predisable, 842 }; 843 844 static int adxl372_dready_trig_set_state(struct iio_trigger *trig, 845 bool state) 846 { 847 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 848 struct adxl372_state *st = iio_priv(indio_dev); 849 unsigned long int mask = 0; 850 851 if (state) 852 mask = ADXL372_INT1_MAP_FIFO_FULL_MSK; 853 854 return adxl372_set_interrupts(st, mask, 0); 855 } 856 857 static int adxl372_validate_trigger(struct iio_dev *indio_dev, 858 struct iio_trigger *trig) 859 { 860 struct adxl372_state *st = iio_priv(indio_dev); 861 862 if (st->dready_trig != trig) 863 return -EINVAL; 864 865 return 0; 866 } 867 868 static const struct iio_trigger_ops adxl372_trigger_ops = { 869 .validate_device = &iio_trigger_validate_own_device, 870 .set_trigger_state = adxl372_dready_trig_set_state, 871 }; 872 873 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("400 800 1600 3200 6400"); 874 static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available, 875 0444, adxl372_show_filter_freq_avail, NULL, 0); 876 877 static struct attribute *adxl372_attributes[] = { 878 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 879 &iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr, 880 NULL, 881 }; 882 883 static const struct attribute_group adxl372_attrs_group = { 884 .attrs = adxl372_attributes, 885 }; 886 887 static const struct iio_info adxl372_info = { 888 .validate_trigger = &adxl372_validate_trigger, 889 .attrs = &adxl372_attrs_group, 890 .read_raw = adxl372_read_raw, 891 .write_raw = adxl372_write_raw, 892 .debugfs_reg_access = &adxl372_reg_access, 893 .hwfifo_set_watermark = adxl372_set_watermark, 894 }; 895 896 bool adxl372_readable_noinc_reg(struct device *dev, unsigned int reg) 897 { 898 return (reg == ADXL372_FIFO_DATA); 899 } 900 EXPORT_SYMBOL_GPL(adxl372_readable_noinc_reg); 901 902 int adxl372_probe(struct device *dev, struct regmap *regmap, 903 int irq, const char *name) 904 { 905 struct iio_dev *indio_dev; 906 struct adxl372_state *st; 907 int ret; 908 909 indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); 910 if (!indio_dev) 911 return -ENOMEM; 912 913 st = iio_priv(indio_dev); 914 dev_set_drvdata(dev, indio_dev); 915 916 st->dev = dev; 917 st->regmap = regmap; 918 st->irq = irq; 919 920 indio_dev->channels = adxl372_channels; 921 indio_dev->num_channels = ARRAY_SIZE(adxl372_channels); 922 indio_dev->available_scan_masks = adxl372_channel_masks; 923 indio_dev->dev.parent = dev; 924 indio_dev->name = name; 925 indio_dev->info = &adxl372_info; 926 indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE; 927 928 ret = adxl372_setup(st); 929 if (ret < 0) { 930 dev_err(dev, "ADXL372 setup failed\n"); 931 return ret; 932 } 933 934 ret = devm_iio_triggered_buffer_setup(dev, 935 indio_dev, NULL, 936 adxl372_trigger_handler, 937 &adxl372_buffer_ops); 938 if (ret < 0) 939 return ret; 940 941 iio_buffer_set_attrs(indio_dev->buffer, adxl372_fifo_attributes); 942 943 if (st->irq) { 944 st->dready_trig = devm_iio_trigger_alloc(dev, 945 "%s-dev%d", 946 indio_dev->name, 947 indio_dev->id); 948 if (st->dready_trig == NULL) 949 return -ENOMEM; 950 951 st->dready_trig->ops = &adxl372_trigger_ops; 952 st->dready_trig->dev.parent = dev; 953 iio_trigger_set_drvdata(st->dready_trig, indio_dev); 954 ret = devm_iio_trigger_register(dev, st->dready_trig); 955 if (ret < 0) 956 return ret; 957 958 indio_dev->trig = iio_trigger_get(st->dready_trig); 959 960 ret = devm_request_threaded_irq(dev, st->irq, 961 iio_trigger_generic_data_rdy_poll, 962 NULL, 963 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 964 indio_dev->name, st->dready_trig); 965 if (ret < 0) 966 return ret; 967 } 968 969 return devm_iio_device_register(dev, indio_dev); 970 } 971 EXPORT_SYMBOL_GPL(adxl372_probe); 972 973 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>"); 974 MODULE_DESCRIPTION("Analog Devices ADXL372 3-axis accelerometer driver"); 975 MODULE_LICENSE("GPL"); 976