1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * System Control and Management Interface(SCMI) based IIO sensor driver 5 * 6 * Copyright (C) 2021 Google LLC 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/err.h> 11 #include <linux/iio/buffer.h> 12 #include <linux/iio/iio.h> 13 #include <linux/iio/kfifo_buf.h> 14 #include <linux/iio/sysfs.h> 15 #include <linux/kernel.h> 16 #include <linux/kthread.h> 17 #include <linux/module.h> 18 #include <linux/scmi_protocol.h> 19 #include <linux/time.h> 20 #include <linux/types.h> 21 22 #define SCMI_IIO_NUM_OF_AXIS 3 23 24 struct scmi_iio_priv { 25 const struct scmi_sensor_proto_ops *sensor_ops; 26 struct scmi_protocol_handle *ph; 27 const struct scmi_sensor_info *sensor_info; 28 struct iio_dev *indio_dev; 29 /* adding one additional channel for timestamp */ 30 s64 iio_buf[SCMI_IIO_NUM_OF_AXIS + 1]; 31 struct notifier_block sensor_update_nb; 32 u32 *freq_avail; 33 }; 34 35 static int scmi_iio_sensor_update_cb(struct notifier_block *nb, 36 unsigned long event, void *data) 37 { 38 struct scmi_sensor_update_report *sensor_update = data; 39 struct iio_dev *scmi_iio_dev; 40 struct scmi_iio_priv *sensor; 41 s8 tstamp_scale; 42 u64 time, time_ns; 43 int i; 44 45 if (sensor_update->readings_count == 0) 46 return NOTIFY_DONE; 47 48 sensor = container_of(nb, struct scmi_iio_priv, sensor_update_nb); 49 50 for (i = 0; i < sensor_update->readings_count; i++) 51 sensor->iio_buf[i] = sensor_update->readings[i].value; 52 53 if (!sensor->sensor_info->timestamped) { 54 time_ns = ktime_to_ns(sensor_update->timestamp); 55 } else { 56 /* 57 * All the axes are supposed to have the same value for timestamp. 58 * We are just using the values from the Axis 0 here. 59 */ 60 time = sensor_update->readings[0].timestamp; 61 62 /* 63 * Timestamp returned by SCMI is in seconds and is equal to 64 * time * power-of-10 multiplier(tstamp_scale) seconds. 65 * Converting the timestamp to nanoseconds below. 66 */ 67 tstamp_scale = sensor->sensor_info->tstamp_scale + 68 const_ilog2(NSEC_PER_SEC) / const_ilog2(10); 69 if (tstamp_scale < 0) { 70 do_div(time, int_pow(10, abs(tstamp_scale))); 71 time_ns = time; 72 } else { 73 time_ns = time * int_pow(10, tstamp_scale); 74 } 75 } 76 77 scmi_iio_dev = sensor->indio_dev; 78 iio_push_to_buffers_with_timestamp(scmi_iio_dev, sensor->iio_buf, 79 time_ns); 80 return NOTIFY_OK; 81 } 82 83 static int scmi_iio_buffer_preenable(struct iio_dev *iio_dev) 84 { 85 struct scmi_iio_priv *sensor = iio_priv(iio_dev); 86 u32 sensor_config = 0; 87 int err; 88 89 if (sensor->sensor_info->timestamped) 90 sensor_config |= FIELD_PREP(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, 91 SCMI_SENS_CFG_TSTAMP_ENABLE); 92 93 sensor_config |= FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK, 94 SCMI_SENS_CFG_SENSOR_ENABLE); 95 err = sensor->sensor_ops->config_set(sensor->ph, 96 sensor->sensor_info->id, 97 sensor_config); 98 if (err) 99 dev_err(&iio_dev->dev, "Error in enabling sensor %s err %d", 100 sensor->sensor_info->name, err); 101 102 return err; 103 } 104 105 static int scmi_iio_buffer_postdisable(struct iio_dev *iio_dev) 106 { 107 struct scmi_iio_priv *sensor = iio_priv(iio_dev); 108 u32 sensor_config = 0; 109 int err; 110 111 sensor_config |= FIELD_PREP(SCMI_SENS_CFG_SENSOR_ENABLED_MASK, 112 SCMI_SENS_CFG_SENSOR_DISABLE); 113 err = sensor->sensor_ops->config_set(sensor->ph, 114 sensor->sensor_info->id, 115 sensor_config); 116 if (err) { 117 dev_err(&iio_dev->dev, 118 "Error in disabling sensor %s with err %d", 119 sensor->sensor_info->name, err); 120 } 121 122 return err; 123 } 124 125 static const struct iio_buffer_setup_ops scmi_iio_buffer_ops = { 126 .preenable = scmi_iio_buffer_preenable, 127 .postdisable = scmi_iio_buffer_postdisable, 128 }; 129 130 static int scmi_iio_set_odr_val(struct iio_dev *iio_dev, int val, int val2) 131 { 132 struct scmi_iio_priv *sensor = iio_priv(iio_dev); 133 const unsigned long UHZ_PER_HZ = 1000000UL; 134 u64 sec, mult, uHz, sf; 135 u32 sensor_config; 136 char buf[32]; 137 138 int err = sensor->sensor_ops->config_get(sensor->ph, 139 sensor->sensor_info->id, 140 &sensor_config); 141 if (err) { 142 dev_err(&iio_dev->dev, 143 "Error in getting sensor config for sensor %s err %d", 144 sensor->sensor_info->name, err); 145 return err; 146 } 147 148 uHz = val * UHZ_PER_HZ + val2; 149 150 /* 151 * The seconds field in the sensor interval in SCMI is 16 bits long 152 * Therefore seconds = 1/Hz <= 0xFFFF. As floating point calculations are 153 * discouraged in the kernel driver code, to calculate the scale factor (sf) 154 * (1* 1000000 * sf)/uHz <= 0xFFFF. Therefore, sf <= (uHz * 0xFFFF)/1000000 155 * To calculate the multiplier,we convert the sf into char string and 156 * count the number of characters 157 */ 158 sf = (u64)uHz * 0xFFFF; 159 do_div(sf, UHZ_PER_HZ); 160 mult = scnprintf(buf, sizeof(buf), "%llu", sf) - 1; 161 162 sec = int_pow(10, mult) * UHZ_PER_HZ; 163 do_div(sec, uHz); 164 if (sec == 0) { 165 dev_err(&iio_dev->dev, 166 "Trying to set invalid sensor update value for sensor %s", 167 sensor->sensor_info->name); 168 return -EINVAL; 169 } 170 171 sensor_config &= ~SCMI_SENS_CFG_UPDATE_SECS_MASK; 172 sensor_config |= FIELD_PREP(SCMI_SENS_CFG_UPDATE_SECS_MASK, sec); 173 sensor_config &= ~SCMI_SENS_CFG_UPDATE_EXP_MASK; 174 sensor_config |= FIELD_PREP(SCMI_SENS_CFG_UPDATE_EXP_MASK, -mult); 175 176 if (sensor->sensor_info->timestamped) { 177 sensor_config &= ~SCMI_SENS_CFG_TSTAMP_ENABLED_MASK; 178 sensor_config |= FIELD_PREP(SCMI_SENS_CFG_TSTAMP_ENABLED_MASK, 179 SCMI_SENS_CFG_TSTAMP_ENABLE); 180 } 181 182 sensor_config &= ~SCMI_SENS_CFG_ROUND_MASK; 183 sensor_config |= 184 FIELD_PREP(SCMI_SENS_CFG_ROUND_MASK, SCMI_SENS_CFG_ROUND_AUTO); 185 186 err = sensor->sensor_ops->config_set(sensor->ph, 187 sensor->sensor_info->id, 188 sensor_config); 189 if (err) 190 dev_err(&iio_dev->dev, 191 "Error in setting sensor update interval for sensor %s value %u err %d", 192 sensor->sensor_info->name, sensor_config, err); 193 194 return err; 195 } 196 197 static int scmi_iio_write_raw(struct iio_dev *iio_dev, 198 struct iio_chan_spec const *chan, int val, 199 int val2, long mask) 200 { 201 int err; 202 203 switch (mask) { 204 case IIO_CHAN_INFO_SAMP_FREQ: 205 mutex_lock(&iio_dev->mlock); 206 err = scmi_iio_set_odr_val(iio_dev, val, val2); 207 mutex_unlock(&iio_dev->mlock); 208 return err; 209 default: 210 return -EINVAL; 211 } 212 } 213 214 static int scmi_iio_read_avail(struct iio_dev *iio_dev, 215 struct iio_chan_spec const *chan, 216 const int **vals, int *type, int *length, 217 long mask) 218 { 219 struct scmi_iio_priv *sensor = iio_priv(iio_dev); 220 221 switch (mask) { 222 case IIO_CHAN_INFO_SAMP_FREQ: 223 *vals = sensor->freq_avail; 224 *type = IIO_VAL_INT_PLUS_MICRO; 225 *length = sensor->sensor_info->intervals.count * 2; 226 if (sensor->sensor_info->intervals.segmented) 227 return IIO_AVAIL_RANGE; 228 else 229 return IIO_AVAIL_LIST; 230 default: 231 return -EINVAL; 232 } 233 } 234 235 static void convert_ns_to_freq(u64 interval_ns, u64 *hz, u64 *uhz) 236 { 237 u64 rem, freq; 238 239 freq = NSEC_PER_SEC; 240 rem = do_div(freq, interval_ns); 241 *hz = freq; 242 *uhz = rem * 1000000UL; 243 do_div(*uhz, interval_ns); 244 } 245 246 static int scmi_iio_get_odr_val(struct iio_dev *iio_dev, int *val, int *val2) 247 { 248 u64 sensor_update_interval, sensor_interval_mult, hz, uhz; 249 struct scmi_iio_priv *sensor = iio_priv(iio_dev); 250 u32 sensor_config; 251 int mult; 252 253 int err = sensor->sensor_ops->config_get(sensor->ph, 254 sensor->sensor_info->id, 255 &sensor_config); 256 if (err) { 257 dev_err(&iio_dev->dev, 258 "Error in getting sensor config for sensor %s err %d", 259 sensor->sensor_info->name, err); 260 return err; 261 } 262 263 sensor_update_interval = 264 SCMI_SENS_CFG_GET_UPDATE_SECS(sensor_config) * NSEC_PER_SEC; 265 266 mult = SCMI_SENS_CFG_GET_UPDATE_EXP(sensor_config); 267 if (mult < 0) { 268 sensor_interval_mult = int_pow(10, abs(mult)); 269 do_div(sensor_update_interval, sensor_interval_mult); 270 } else { 271 sensor_interval_mult = int_pow(10, mult); 272 sensor_update_interval = 273 sensor_update_interval * sensor_interval_mult; 274 } 275 276 convert_ns_to_freq(sensor_update_interval, &hz, &uhz); 277 *val = hz; 278 *val2 = uhz; 279 return 0; 280 } 281 282 static int scmi_iio_read_raw(struct iio_dev *iio_dev, 283 struct iio_chan_spec const *ch, int *val, 284 int *val2, long mask) 285 { 286 struct scmi_iio_priv *sensor = iio_priv(iio_dev); 287 s8 scale; 288 int ret; 289 290 switch (mask) { 291 case IIO_CHAN_INFO_SCALE: 292 scale = sensor->sensor_info->axis[ch->scan_index].scale; 293 if (scale < 0) { 294 *val = 1; 295 *val2 = int_pow(10, abs(scale)); 296 return IIO_VAL_FRACTIONAL; 297 } 298 *val = int_pow(10, scale); 299 return IIO_VAL_INT; 300 case IIO_CHAN_INFO_SAMP_FREQ: 301 ret = scmi_iio_get_odr_val(iio_dev, val, val2); 302 return ret ? ret : IIO_VAL_INT_PLUS_MICRO; 303 default: 304 return -EINVAL; 305 } 306 } 307 308 static const struct iio_info scmi_iio_info = { 309 .read_raw = scmi_iio_read_raw, 310 .read_avail = scmi_iio_read_avail, 311 .write_raw = scmi_iio_write_raw, 312 }; 313 314 static ssize_t scmi_iio_get_raw_available(struct iio_dev *iio_dev, 315 uintptr_t private, 316 const struct iio_chan_spec *chan, 317 char *buf) 318 { 319 struct scmi_iio_priv *sensor = iio_priv(iio_dev); 320 u64 resolution, rem; 321 s64 min_range, max_range; 322 s8 exponent, scale; 323 int len = 0; 324 325 /* 326 * All the axes are supposed to have the same value for range and resolution. 327 * We are just using the values from the Axis 0 here. 328 */ 329 if (sensor->sensor_info->axis[0].extended_attrs) { 330 min_range = sensor->sensor_info->axis[0].attrs.min_range; 331 max_range = sensor->sensor_info->axis[0].attrs.max_range; 332 resolution = sensor->sensor_info->axis[0].resolution; 333 exponent = sensor->sensor_info->axis[0].exponent; 334 scale = sensor->sensor_info->axis[0].scale; 335 336 /* 337 * To provide the raw value for the resolution to the userspace, 338 * need to divide the resolution exponent by the sensor scale 339 */ 340 exponent = exponent - scale; 341 if (exponent < 0) { 342 rem = do_div(resolution, 343 int_pow(10, abs(exponent)) 344 ); 345 len = scnprintf(buf, PAGE_SIZE, 346 "[%lld %llu.%llu %lld]\n", min_range, 347 resolution, rem, max_range); 348 } else { 349 resolution = resolution * int_pow(10, exponent); 350 len = scnprintf(buf, PAGE_SIZE, "[%lld %llu %lld]\n", 351 min_range, resolution, max_range); 352 } 353 } 354 return len; 355 } 356 357 static const struct iio_chan_spec_ext_info scmi_iio_ext_info[] = { 358 { 359 .name = "raw_available", 360 .read = scmi_iio_get_raw_available, 361 .shared = IIO_SHARED_BY_TYPE, 362 }, 363 {}, 364 }; 365 366 static void scmi_iio_set_timestamp_channel(struct iio_chan_spec *iio_chan, 367 int scan_index) 368 { 369 iio_chan->type = IIO_TIMESTAMP; 370 iio_chan->channel = -1; 371 iio_chan->scan_index = scan_index; 372 iio_chan->scan_type.sign = 'u'; 373 iio_chan->scan_type.realbits = 64; 374 iio_chan->scan_type.storagebits = 64; 375 } 376 377 static void scmi_iio_set_data_channel(struct iio_chan_spec *iio_chan, 378 enum iio_chan_type type, 379 enum iio_modifier mod, int scan_index) 380 { 381 iio_chan->type = type; 382 iio_chan->modified = 1; 383 iio_chan->channel2 = mod; 384 iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_SCALE); 385 iio_chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ); 386 iio_chan->info_mask_shared_by_type_available = 387 BIT(IIO_CHAN_INFO_SAMP_FREQ); 388 iio_chan->scan_index = scan_index; 389 iio_chan->scan_type.sign = 's'; 390 iio_chan->scan_type.realbits = 64; 391 iio_chan->scan_type.storagebits = 64; 392 iio_chan->scan_type.endianness = IIO_LE; 393 iio_chan->ext_info = scmi_iio_ext_info; 394 } 395 396 static int scmi_iio_get_chan_modifier(const char *name, 397 enum iio_modifier *modifier) 398 { 399 char *pch, mod; 400 401 if (!name) 402 return -EINVAL; 403 404 pch = strrchr(name, '_'); 405 if (!pch) 406 return -EINVAL; 407 408 mod = *(pch + 1); 409 switch (mod) { 410 case 'X': 411 *modifier = IIO_MOD_X; 412 return 0; 413 case 'Y': 414 *modifier = IIO_MOD_Y; 415 return 0; 416 case 'Z': 417 *modifier = IIO_MOD_Z; 418 return 0; 419 default: 420 return -EINVAL; 421 } 422 } 423 424 static int scmi_iio_get_chan_type(u8 scmi_type, enum iio_chan_type *iio_type) 425 { 426 switch (scmi_type) { 427 case METERS_SEC_SQUARED: 428 *iio_type = IIO_ACCEL; 429 return 0; 430 case RADIANS_SEC: 431 *iio_type = IIO_ANGL_VEL; 432 return 0; 433 default: 434 return -EINVAL; 435 } 436 } 437 438 static u64 scmi_iio_convert_interval_to_ns(u32 val) 439 { 440 u64 sensor_update_interval = 441 SCMI_SENS_INTVL_GET_SECS(val) * NSEC_PER_SEC; 442 u64 sensor_interval_mult; 443 int mult; 444 445 mult = SCMI_SENS_INTVL_GET_EXP(val); 446 if (mult < 0) { 447 sensor_interval_mult = int_pow(10, abs(mult)); 448 do_div(sensor_update_interval, sensor_interval_mult); 449 } else { 450 sensor_interval_mult = int_pow(10, mult); 451 sensor_update_interval = 452 sensor_update_interval * sensor_interval_mult; 453 } 454 return sensor_update_interval; 455 } 456 457 static int scmi_iio_set_sampling_freq_avail(struct iio_dev *iio_dev) 458 { 459 u64 cur_interval_ns, low_interval_ns, high_interval_ns, step_size_ns, 460 hz, uhz; 461 unsigned int cur_interval, low_interval, high_interval, step_size; 462 struct scmi_iio_priv *sensor = iio_priv(iio_dev); 463 int i; 464 465 sensor->freq_avail = 466 devm_kzalloc(&iio_dev->dev, 467 sizeof(*sensor->freq_avail) * 468 (sensor->sensor_info->intervals.count * 2), 469 GFP_KERNEL); 470 if (!sensor->freq_avail) 471 return -ENOMEM; 472 473 if (sensor->sensor_info->intervals.segmented) { 474 low_interval = sensor->sensor_info->intervals 475 .desc[SCMI_SENS_INTVL_SEGMENT_LOW]; 476 low_interval_ns = scmi_iio_convert_interval_to_ns(low_interval); 477 convert_ns_to_freq(low_interval_ns, &hz, &uhz); 478 sensor->freq_avail[0] = hz; 479 sensor->freq_avail[1] = uhz; 480 481 step_size = sensor->sensor_info->intervals 482 .desc[SCMI_SENS_INTVL_SEGMENT_STEP]; 483 step_size_ns = scmi_iio_convert_interval_to_ns(step_size); 484 convert_ns_to_freq(step_size_ns, &hz, &uhz); 485 sensor->freq_avail[2] = hz; 486 sensor->freq_avail[3] = uhz; 487 488 high_interval = sensor->sensor_info->intervals 489 .desc[SCMI_SENS_INTVL_SEGMENT_HIGH]; 490 high_interval_ns = 491 scmi_iio_convert_interval_to_ns(high_interval); 492 convert_ns_to_freq(high_interval_ns, &hz, &uhz); 493 sensor->freq_avail[4] = hz; 494 sensor->freq_avail[5] = uhz; 495 } else { 496 for (i = 0; i < sensor->sensor_info->intervals.count; i++) { 497 cur_interval = sensor->sensor_info->intervals.desc[i]; 498 cur_interval_ns = 499 scmi_iio_convert_interval_to_ns(cur_interval); 500 convert_ns_to_freq(cur_interval_ns, &hz, &uhz); 501 sensor->freq_avail[i * 2] = hz; 502 sensor->freq_avail[i * 2 + 1] = uhz; 503 } 504 } 505 return 0; 506 } 507 508 static struct iio_dev * 509 scmi_alloc_iiodev(struct scmi_device *sdev, 510 const struct scmi_sensor_proto_ops *ops, 511 struct scmi_protocol_handle *ph, 512 const struct scmi_sensor_info *sensor_info) 513 { 514 struct iio_chan_spec *iio_channels; 515 struct scmi_iio_priv *sensor; 516 enum iio_modifier modifier; 517 enum iio_chan_type type; 518 struct iio_dev *iiodev; 519 struct device *dev = &sdev->dev; 520 const struct scmi_handle *handle = sdev->handle; 521 int i, ret; 522 523 iiodev = devm_iio_device_alloc(dev, sizeof(*sensor)); 524 if (!iiodev) 525 return ERR_PTR(-ENOMEM); 526 527 iiodev->modes = INDIO_DIRECT_MODE; 528 iiodev->dev.parent = dev; 529 sensor = iio_priv(iiodev); 530 sensor->sensor_ops = ops; 531 sensor->ph = ph; 532 sensor->sensor_info = sensor_info; 533 sensor->sensor_update_nb.notifier_call = scmi_iio_sensor_update_cb; 534 sensor->indio_dev = iiodev; 535 536 /* adding one additional channel for timestamp */ 537 iiodev->num_channels = sensor_info->num_axis + 1; 538 iiodev->name = sensor_info->name; 539 iiodev->info = &scmi_iio_info; 540 541 iio_channels = 542 devm_kzalloc(dev, 543 sizeof(*iio_channels) * (iiodev->num_channels), 544 GFP_KERNEL); 545 if (!iio_channels) 546 return ERR_PTR(-ENOMEM); 547 548 ret = scmi_iio_set_sampling_freq_avail(iiodev); 549 if (ret < 0) 550 return ERR_PTR(ret); 551 552 for (i = 0; i < sensor_info->num_axis; i++) { 553 ret = scmi_iio_get_chan_type(sensor_info->axis[i].type, &type); 554 if (ret < 0) 555 return ERR_PTR(ret); 556 557 ret = scmi_iio_get_chan_modifier(sensor_info->axis[i].name, 558 &modifier); 559 if (ret < 0) 560 return ERR_PTR(ret); 561 562 scmi_iio_set_data_channel(&iio_channels[i], type, modifier, 563 sensor_info->axis[i].id); 564 } 565 566 ret = handle->notify_ops->devm_event_notifier_register(sdev, 567 SCMI_PROTOCOL_SENSOR, SCMI_EVENT_SENSOR_UPDATE, 568 &sensor->sensor_info->id, 569 &sensor->sensor_update_nb); 570 if (ret) { 571 dev_err(&iiodev->dev, 572 "Error in registering sensor update notifier for sensor %s err %d", 573 sensor->sensor_info->name, ret); 574 return ERR_PTR(ret); 575 } 576 577 scmi_iio_set_timestamp_channel(&iio_channels[i], i); 578 iiodev->channels = iio_channels; 579 return iiodev; 580 } 581 582 static int scmi_iio_dev_probe(struct scmi_device *sdev) 583 { 584 const struct scmi_sensor_info *sensor_info; 585 struct scmi_handle *handle = sdev->handle; 586 const struct scmi_sensor_proto_ops *sensor_ops; 587 struct scmi_protocol_handle *ph; 588 struct device *dev = &sdev->dev; 589 struct iio_dev *scmi_iio_dev; 590 u16 nr_sensors; 591 int err = -ENODEV, i; 592 593 if (!handle) 594 return -ENODEV; 595 596 sensor_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_SENSOR, &ph); 597 if (IS_ERR(sensor_ops)) { 598 dev_err(dev, "SCMI device has no sensor interface\n"); 599 return PTR_ERR(sensor_ops); 600 } 601 602 nr_sensors = sensor_ops->count_get(ph); 603 if (!nr_sensors) { 604 dev_dbg(dev, "0 sensors found via SCMI bus\n"); 605 return -ENODEV; 606 } 607 608 for (i = 0; i < nr_sensors; i++) { 609 sensor_info = sensor_ops->info_get(ph, i); 610 if (!sensor_info) { 611 dev_err(dev, "SCMI sensor %d has missing info\n", i); 612 return -EINVAL; 613 } 614 615 /* This driver only supports 3-axis accel and gyro, skipping other sensors */ 616 if (sensor_info->num_axis != SCMI_IIO_NUM_OF_AXIS) 617 continue; 618 619 /* This driver only supports 3-axis accel and gyro, skipping other sensors */ 620 if (sensor_info->axis[0].type != METERS_SEC_SQUARED && 621 sensor_info->axis[0].type != RADIANS_SEC) 622 continue; 623 624 scmi_iio_dev = scmi_alloc_iiodev(sdev, sensor_ops, ph, 625 sensor_info); 626 if (IS_ERR(scmi_iio_dev)) { 627 dev_err(dev, 628 "failed to allocate IIO device for sensor %s: %ld\n", 629 sensor_info->name, PTR_ERR(scmi_iio_dev)); 630 return PTR_ERR(scmi_iio_dev); 631 } 632 633 err = devm_iio_kfifo_buffer_setup(&scmi_iio_dev->dev, 634 scmi_iio_dev, 635 INDIO_BUFFER_SOFTWARE, 636 &scmi_iio_buffer_ops); 637 if (err < 0) { 638 dev_err(dev, 639 "IIO buffer setup error at sensor %s: %d\n", 640 sensor_info->name, err); 641 return err; 642 } 643 644 err = devm_iio_device_register(dev, scmi_iio_dev); 645 if (err) { 646 dev_err(dev, 647 "IIO device registration failed at sensor %s: %d\n", 648 sensor_info->name, err); 649 return err; 650 } 651 } 652 return err; 653 } 654 655 static const struct scmi_device_id scmi_id_table[] = { 656 { SCMI_PROTOCOL_SENSOR, "iiodev" }, 657 {}, 658 }; 659 660 MODULE_DEVICE_TABLE(scmi, scmi_id_table); 661 662 static struct scmi_driver scmi_iiodev_driver = { 663 .name = "scmi-sensor-iiodev", 664 .probe = scmi_iio_dev_probe, 665 .id_table = scmi_id_table, 666 }; 667 668 module_scmi_driver(scmi_iiodev_driver); 669 670 MODULE_AUTHOR("Jyoti Bhayana <jbhayana@google.com>"); 671 MODULE_DESCRIPTION("SCMI IIO Driver"); 672 MODULE_LICENSE("GPL v2"); 673