1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * cros_ec_sensors_core - Common function for Chrome OS EC sensor driver. 4 * 5 * Copyright (C) 2016 Google, Inc 6 */ 7 8 #include <linux/delay.h> 9 #include <linux/device.h> 10 #include <linux/iio/buffer.h> 11 #include <linux/iio/common/cros_ec_sensors_core.h> 12 #include <linux/iio/iio.h> 13 #include <linux/iio/kfifo_buf.h> 14 #include <linux/iio/sysfs.h> 15 #include <linux/iio/trigger_consumer.h> 16 #include <linux/iio/triggered_buffer.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/platform_data/cros_ec_commands.h> 21 #include <linux/platform_data/cros_ec_proto.h> 22 #include <linux/platform_data/cros_ec_sensorhub.h> 23 #include <linux/platform_device.h> 24 25 /* 26 * Hard coded to the first device to support sensor fifo. The EC has a 2048 27 * byte fifo and will trigger an interrupt when fifo is 2/3 full. 28 */ 29 #define CROS_EC_FIFO_SIZE (2048 * 2 / 3) 30 31 static char *cros_ec_loc[] = { 32 [MOTIONSENSE_LOC_BASE] = "base", 33 [MOTIONSENSE_LOC_LID] = "lid", 34 [MOTIONSENSE_LOC_MAX] = "unknown", 35 }; 36 37 static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev, 38 u16 cmd_offset, u16 cmd, u32 *mask) 39 { 40 int ret; 41 struct { 42 struct cros_ec_command msg; 43 union { 44 struct ec_params_get_cmd_versions params; 45 struct ec_response_get_cmd_versions resp; 46 }; 47 } __packed buf = { 48 .msg = { 49 .command = EC_CMD_GET_CMD_VERSIONS + cmd_offset, 50 .insize = sizeof(struct ec_response_get_cmd_versions), 51 .outsize = sizeof(struct ec_params_get_cmd_versions) 52 }, 53 .params = {.cmd = cmd} 54 }; 55 56 ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg); 57 if (ret >= 0) 58 *mask = buf.resp.version_mask; 59 return ret; 60 } 61 62 static void get_default_min_max_freq(enum motionsensor_type type, 63 u32 *min_freq, 64 u32 *max_freq, 65 u32 *max_fifo_events) 66 { 67 /* 68 * We don't know fifo size, set to size previously used by older 69 * hardware. 70 */ 71 *max_fifo_events = CROS_EC_FIFO_SIZE; 72 73 switch (type) { 74 case MOTIONSENSE_TYPE_ACCEL: 75 *min_freq = 12500; 76 *max_freq = 100000; 77 break; 78 case MOTIONSENSE_TYPE_GYRO: 79 *min_freq = 25000; 80 *max_freq = 100000; 81 break; 82 case MOTIONSENSE_TYPE_MAG: 83 *min_freq = 5000; 84 *max_freq = 25000; 85 break; 86 case MOTIONSENSE_TYPE_PROX: 87 case MOTIONSENSE_TYPE_LIGHT: 88 *min_freq = 100; 89 *max_freq = 50000; 90 break; 91 case MOTIONSENSE_TYPE_BARO: 92 *min_freq = 250; 93 *max_freq = 20000; 94 break; 95 case MOTIONSENSE_TYPE_ACTIVITY: 96 default: 97 *min_freq = 0; 98 *max_freq = 0; 99 break; 100 } 101 } 102 103 static int cros_ec_sensor_set_ec_rate(struct cros_ec_sensors_core_state *st, 104 int rate) 105 { 106 int ret; 107 108 if (rate > U16_MAX) 109 rate = U16_MAX; 110 111 mutex_lock(&st->cmd_lock); 112 st->param.cmd = MOTIONSENSE_CMD_EC_RATE; 113 st->param.ec_rate.data = rate; 114 ret = cros_ec_motion_send_host_cmd(st, 0); 115 mutex_unlock(&st->cmd_lock); 116 return ret; 117 } 118 119 static ssize_t cros_ec_sensor_set_report_latency(struct device *dev, 120 struct device_attribute *attr, 121 const char *buf, size_t len) 122 { 123 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 124 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 125 int integer, fract, ret; 126 int latency; 127 128 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract); 129 if (ret) 130 return ret; 131 132 /* EC rate is in ms. */ 133 latency = integer * 1000 + fract / 1000; 134 ret = cros_ec_sensor_set_ec_rate(st, latency); 135 if (ret < 0) 136 return ret; 137 138 return len; 139 } 140 141 static ssize_t cros_ec_sensor_get_report_latency(struct device *dev, 142 struct device_attribute *attr, 143 char *buf) 144 { 145 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 146 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 147 int latency, ret; 148 149 mutex_lock(&st->cmd_lock); 150 st->param.cmd = MOTIONSENSE_CMD_EC_RATE; 151 st->param.ec_rate.data = EC_MOTION_SENSE_NO_VALUE; 152 153 ret = cros_ec_motion_send_host_cmd(st, 0); 154 latency = st->resp->ec_rate.ret; 155 mutex_unlock(&st->cmd_lock); 156 if (ret < 0) 157 return ret; 158 159 return sprintf(buf, "%d.%06u\n", 160 latency / 1000, 161 (latency % 1000) * 1000); 162 } 163 164 static IIO_DEVICE_ATTR(hwfifo_timeout, 0644, 165 cros_ec_sensor_get_report_latency, 166 cros_ec_sensor_set_report_latency, 0); 167 168 static ssize_t hwfifo_watermark_max_show(struct device *dev, 169 struct device_attribute *attr, 170 char *buf) 171 { 172 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 173 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 174 175 return sprintf(buf, "%d\n", st->fifo_max_event_count); 176 } 177 178 static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0); 179 180 static const struct attribute *cros_ec_sensor_fifo_attributes[] = { 181 &iio_dev_attr_hwfifo_timeout.dev_attr.attr, 182 &iio_dev_attr_hwfifo_watermark_max.dev_attr.attr, 183 NULL, 184 }; 185 186 int cros_ec_sensors_push_data(struct iio_dev *indio_dev, 187 s16 *data, 188 s64 timestamp) 189 { 190 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 191 s16 *out; 192 s64 delta; 193 unsigned int i; 194 195 /* 196 * Ignore samples if the buffer is not set: it is needed if the ODR is 197 * set but the buffer is not enabled yet. 198 */ 199 if (!iio_buffer_enabled(indio_dev)) 200 return 0; 201 202 out = (s16 *)st->samples; 203 for_each_set_bit(i, 204 indio_dev->active_scan_mask, 205 indio_dev->masklength) { 206 *out = data[i]; 207 out++; 208 } 209 210 if (iio_device_get_clock(indio_dev) != CLOCK_BOOTTIME) 211 delta = iio_get_time_ns(indio_dev) - cros_ec_get_time_ns(); 212 else 213 delta = 0; 214 215 iio_push_to_buffers_with_timestamp(indio_dev, st->samples, 216 timestamp + delta); 217 218 return 0; 219 } 220 EXPORT_SYMBOL_GPL(cros_ec_sensors_push_data); 221 222 static void cros_ec_sensors_core_clean(void *arg) 223 { 224 struct platform_device *pdev = (struct platform_device *)arg; 225 struct cros_ec_sensorhub *sensor_hub = 226 dev_get_drvdata(pdev->dev.parent); 227 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 228 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 229 u8 sensor_num = st->param.info.sensor_num; 230 231 cros_ec_sensorhub_unregister_push_data(sensor_hub, sensor_num); 232 } 233 234 /** 235 * cros_ec_sensors_core_init() - basic initialization of the core structure 236 * @pdev: platform device created for the sensors 237 * @indio_dev: iio device structure of the device 238 * @physical_device: true if the device refers to a physical device 239 * @trigger_capture: function pointer to call buffer is triggered, 240 * for backward compatibility. 241 * @push_data: function to call when cros_ec_sensorhub receives 242 * a sample for that sensor. 243 * @has_hw_fifo: Set true if this device has/uses a HW FIFO 244 * 245 * Return: 0 on success, -errno on failure. 246 */ 247 int cros_ec_sensors_core_init(struct platform_device *pdev, 248 struct iio_dev *indio_dev, 249 bool physical_device, 250 cros_ec_sensors_capture_t trigger_capture, 251 cros_ec_sensorhub_push_data_cb_t push_data, 252 bool has_hw_fifo) 253 { 254 struct device *dev = &pdev->dev; 255 struct cros_ec_sensors_core_state *state = iio_priv(indio_dev); 256 struct cros_ec_sensorhub *sensor_hub = dev_get_drvdata(dev->parent); 257 struct cros_ec_dev *ec = sensor_hub->ec; 258 struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev); 259 u32 ver_mask; 260 int frequencies[ARRAY_SIZE(state->frequencies) / 2] = { 0 }; 261 int ret, i; 262 263 platform_set_drvdata(pdev, indio_dev); 264 265 state->ec = ec->ec_dev; 266 state->msg = devm_kzalloc(&pdev->dev, 267 max((u16)sizeof(struct ec_params_motion_sense), 268 state->ec->max_response), GFP_KERNEL); 269 if (!state->msg) 270 return -ENOMEM; 271 272 state->resp = (struct ec_response_motion_sense *)state->msg->data; 273 274 mutex_init(&state->cmd_lock); 275 276 ret = cros_ec_get_host_cmd_version_mask(state->ec, 277 ec->cmd_offset, 278 EC_CMD_MOTION_SENSE_CMD, 279 &ver_mask); 280 if (ret < 0) 281 return ret; 282 283 /* Set up the host command structure. */ 284 state->msg->version = fls(ver_mask) - 1; 285 state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; 286 state->msg->outsize = sizeof(struct ec_params_motion_sense); 287 288 indio_dev->name = pdev->name; 289 290 if (physical_device) { 291 state->param.cmd = MOTIONSENSE_CMD_INFO; 292 state->param.info.sensor_num = sensor_platform->sensor_num; 293 ret = cros_ec_motion_send_host_cmd(state, 0); 294 if (ret) { 295 dev_warn(dev, "Can not access sensor info\n"); 296 return ret; 297 } 298 state->type = state->resp->info.type; 299 state->loc = state->resp->info.location; 300 301 /* Set sign vector, only used for backward compatibility. */ 302 memset(state->sign, 1, CROS_EC_SENSOR_MAX_AXIS); 303 304 for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++) 305 state->calib[i].scale = MOTION_SENSE_DEFAULT_SCALE; 306 307 /* 0 is a correct value used to stop the device */ 308 if (state->msg->version < 3) { 309 get_default_min_max_freq(state->resp->info.type, 310 &frequencies[1], 311 &frequencies[2], 312 &state->fifo_max_event_count); 313 } else { 314 frequencies[1] = state->resp->info_3.min_frequency; 315 frequencies[2] = state->resp->info_3.max_frequency; 316 state->fifo_max_event_count = 317 state->resp->info_3.fifo_max_event_count; 318 } 319 for (i = 0; i < ARRAY_SIZE(frequencies); i++) { 320 state->frequencies[2 * i] = frequencies[i] / 1000; 321 state->frequencies[2 * i + 1] = 322 (frequencies[i] % 1000) * 1000; 323 } 324 325 if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) { 326 /* 327 * Create a software buffer, feed by the EC FIFO. 328 * We can not use trigger here, as events are generated 329 * as soon as sample_frequency is set. 330 */ 331 struct iio_buffer *buffer; 332 333 buffer = devm_iio_kfifo_allocate(dev); 334 if (!buffer) 335 return -ENOMEM; 336 337 iio_device_attach_buffer(indio_dev, buffer); 338 indio_dev->modes = INDIO_BUFFER_SOFTWARE; 339 340 ret = cros_ec_sensorhub_register_push_data( 341 sensor_hub, sensor_platform->sensor_num, 342 indio_dev, push_data); 343 if (ret) 344 return ret; 345 346 ret = devm_add_action_or_reset( 347 dev, cros_ec_sensors_core_clean, pdev); 348 if (ret) 349 return ret; 350 351 /* Timestamp coming from FIFO are in ns since boot. */ 352 ret = iio_device_set_clock(indio_dev, CLOCK_BOOTTIME); 353 if (ret) 354 return ret; 355 } else { 356 /* 357 * The only way to get samples in buffer is to set a 358 * software trigger (systrig, hrtimer). 359 */ 360 ret = devm_iio_triggered_buffer_setup( 361 dev, indio_dev, NULL, trigger_capture, 362 NULL); 363 if (ret) 364 return ret; 365 366 if (has_hw_fifo) 367 iio_buffer_set_attrs(indio_dev->buffer, 368 cros_ec_sensor_fifo_attributes); 369 } 370 } 371 372 return 0; 373 } 374 EXPORT_SYMBOL_GPL(cros_ec_sensors_core_init); 375 376 /** 377 * cros_ec_motion_send_host_cmd() - send motion sense host command 378 * @state: pointer to state information for device 379 * @opt_length: optional length to reduce the response size, useful on the data 380 * path. Otherwise, the maximal allowed response size is used 381 * 382 * When called, the sub-command is assumed to be set in param->cmd. 383 * 384 * Return: 0 on success, -errno on failure. 385 */ 386 int cros_ec_motion_send_host_cmd(struct cros_ec_sensors_core_state *state, 387 u16 opt_length) 388 { 389 int ret; 390 391 if (opt_length) 392 state->msg->insize = min(opt_length, state->ec->max_response); 393 else 394 state->msg->insize = state->ec->max_response; 395 396 memcpy(state->msg->data, &state->param, sizeof(state->param)); 397 398 ret = cros_ec_cmd_xfer_status(state->ec, state->msg); 399 if (ret < 0) 400 return ret; 401 402 if (ret && 403 state->resp != (struct ec_response_motion_sense *)state->msg->data) 404 memcpy(state->resp, state->msg->data, ret); 405 406 return 0; 407 } 408 EXPORT_SYMBOL_GPL(cros_ec_motion_send_host_cmd); 409 410 static ssize_t cros_ec_sensors_calibrate(struct iio_dev *indio_dev, 411 uintptr_t private, const struct iio_chan_spec *chan, 412 const char *buf, size_t len) 413 { 414 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 415 int ret, i; 416 bool calibrate; 417 418 ret = strtobool(buf, &calibrate); 419 if (ret < 0) 420 return ret; 421 if (!calibrate) 422 return -EINVAL; 423 424 mutex_lock(&st->cmd_lock); 425 st->param.cmd = MOTIONSENSE_CMD_PERFORM_CALIB; 426 ret = cros_ec_motion_send_host_cmd(st, 0); 427 if (ret != 0) { 428 dev_warn(&indio_dev->dev, "Unable to calibrate sensor\n"); 429 } else { 430 /* Save values */ 431 for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++) 432 st->calib[i].offset = st->resp->perform_calib.offset[i]; 433 } 434 mutex_unlock(&st->cmd_lock); 435 436 return ret ? ret : len; 437 } 438 439 static ssize_t cros_ec_sensors_id(struct iio_dev *indio_dev, 440 uintptr_t private, 441 const struct iio_chan_spec *chan, char *buf) 442 { 443 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 444 445 return snprintf(buf, PAGE_SIZE, "%d\n", st->param.info.sensor_num); 446 } 447 448 static ssize_t cros_ec_sensors_loc(struct iio_dev *indio_dev, 449 uintptr_t private, const struct iio_chan_spec *chan, 450 char *buf) 451 { 452 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 453 454 return snprintf(buf, PAGE_SIZE, "%s\n", cros_ec_loc[st->loc]); 455 } 456 457 const struct iio_chan_spec_ext_info cros_ec_sensors_ext_info[] = { 458 { 459 .name = "calibrate", 460 .shared = IIO_SHARED_BY_ALL, 461 .write = cros_ec_sensors_calibrate 462 }, 463 { 464 .name = "id", 465 .shared = IIO_SHARED_BY_ALL, 466 .read = cros_ec_sensors_id 467 }, 468 { 469 .name = "location", 470 .shared = IIO_SHARED_BY_ALL, 471 .read = cros_ec_sensors_loc 472 }, 473 { }, 474 }; 475 EXPORT_SYMBOL_GPL(cros_ec_sensors_ext_info); 476 477 /** 478 * cros_ec_sensors_idx_to_reg - convert index into offset in shared memory 479 * @st: pointer to state information for device 480 * @idx: sensor index (should be element of enum sensor_index) 481 * 482 * Return: address to read at 483 */ 484 static unsigned int cros_ec_sensors_idx_to_reg( 485 struct cros_ec_sensors_core_state *st, 486 unsigned int idx) 487 { 488 /* 489 * When using LPC interface, only space for 2 Accel and one Gyro. 490 * First halfword of MOTIONSENSE_TYPE_ACCEL is used by angle. 491 */ 492 if (st->type == MOTIONSENSE_TYPE_ACCEL) 493 return EC_MEMMAP_ACC_DATA + sizeof(u16) * 494 (1 + idx + st->param.info.sensor_num * 495 CROS_EC_SENSOR_MAX_AXIS); 496 497 return EC_MEMMAP_GYRO_DATA + sizeof(u16) * idx; 498 } 499 500 static int cros_ec_sensors_cmd_read_u8(struct cros_ec_device *ec, 501 unsigned int offset, u8 *dest) 502 { 503 return ec->cmd_readmem(ec, offset, 1, dest); 504 } 505 506 static int cros_ec_sensors_cmd_read_u16(struct cros_ec_device *ec, 507 unsigned int offset, u16 *dest) 508 { 509 __le16 tmp; 510 int ret = ec->cmd_readmem(ec, offset, 2, &tmp); 511 512 if (ret >= 0) 513 *dest = le16_to_cpu(tmp); 514 515 return ret; 516 } 517 518 /** 519 * cros_ec_sensors_read_until_not_busy() - read until is not busy 520 * 521 * @st: pointer to state information for device 522 * 523 * Read from EC status byte until it reads not busy. 524 * Return: 8-bit status if ok, -errno on failure. 525 */ 526 static int cros_ec_sensors_read_until_not_busy( 527 struct cros_ec_sensors_core_state *st) 528 { 529 struct cros_ec_device *ec = st->ec; 530 u8 status; 531 int ret, attempts = 0; 532 533 ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status); 534 if (ret < 0) 535 return ret; 536 537 while (status & EC_MEMMAP_ACC_STATUS_BUSY_BIT) { 538 /* Give up after enough attempts, return error. */ 539 if (attempts++ >= 50) 540 return -EIO; 541 542 /* Small delay every so often. */ 543 if (attempts % 5 == 0) 544 msleep(25); 545 546 ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, 547 &status); 548 if (ret < 0) 549 return ret; 550 } 551 552 return status; 553 } 554 555 /** 556 * read_ec_sensors_data_unsafe() - read acceleration data from EC shared memory 557 * @indio_dev: pointer to IIO device 558 * @scan_mask: bitmap of the sensor indices to scan 559 * @data: location to store data 560 * 561 * This is the unsafe function for reading the EC data. It does not guarantee 562 * that the EC will not modify the data as it is being read in. 563 * 564 * Return: 0 on success, -errno on failure. 565 */ 566 static int cros_ec_sensors_read_data_unsafe(struct iio_dev *indio_dev, 567 unsigned long scan_mask, s16 *data) 568 { 569 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 570 struct cros_ec_device *ec = st->ec; 571 unsigned int i; 572 int ret; 573 574 /* Read all sensors enabled in scan_mask. Each value is 2 bytes. */ 575 for_each_set_bit(i, &scan_mask, indio_dev->masklength) { 576 ret = cros_ec_sensors_cmd_read_u16(ec, 577 cros_ec_sensors_idx_to_reg(st, i), 578 data); 579 if (ret < 0) 580 return ret; 581 582 *data *= st->sign[i]; 583 data++; 584 } 585 586 return 0; 587 } 588 589 /** 590 * cros_ec_sensors_read_lpc() - read acceleration data from EC shared memory. 591 * @indio_dev: pointer to IIO device. 592 * @scan_mask: bitmap of the sensor indices to scan. 593 * @data: location to store data. 594 * 595 * Note: this is the safe function for reading the EC data. It guarantees 596 * that the data sampled was not modified by the EC while being read. 597 * 598 * Return: 0 on success, -errno on failure. 599 */ 600 int cros_ec_sensors_read_lpc(struct iio_dev *indio_dev, 601 unsigned long scan_mask, s16 *data) 602 { 603 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 604 struct cros_ec_device *ec = st->ec; 605 u8 samp_id = 0xff, status = 0; 606 int ret, attempts = 0; 607 608 /* 609 * Continually read all data from EC until the status byte after 610 * all reads reflects that the EC is not busy and the sample id 611 * matches the sample id from before all reads. This guarantees 612 * that data read in was not modified by the EC while reading. 613 */ 614 while ((status & (EC_MEMMAP_ACC_STATUS_BUSY_BIT | 615 EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK)) != samp_id) { 616 /* If we have tried to read too many times, return error. */ 617 if (attempts++ >= 5) 618 return -EIO; 619 620 /* Read status byte until EC is not busy. */ 621 ret = cros_ec_sensors_read_until_not_busy(st); 622 if (ret < 0) 623 return ret; 624 625 /* 626 * Store the current sample id so that we can compare to the 627 * sample id after reading the data. 628 */ 629 samp_id = ret & EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK; 630 631 /* Read all EC data, format it, and store it into data. */ 632 ret = cros_ec_sensors_read_data_unsafe(indio_dev, scan_mask, 633 data); 634 if (ret < 0) 635 return ret; 636 637 /* Read status byte. */ 638 ret = cros_ec_sensors_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, 639 &status); 640 if (ret < 0) 641 return ret; 642 } 643 644 return 0; 645 } 646 EXPORT_SYMBOL_GPL(cros_ec_sensors_read_lpc); 647 648 /** 649 * cros_ec_sensors_read_cmd() - retrieve data using the EC command protocol 650 * @indio_dev: pointer to IIO device 651 * @scan_mask: bitmap of the sensor indices to scan 652 * @data: location to store data 653 * 654 * Return: 0 on success, -errno on failure. 655 */ 656 int cros_ec_sensors_read_cmd(struct iio_dev *indio_dev, 657 unsigned long scan_mask, s16 *data) 658 { 659 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 660 int ret; 661 unsigned int i; 662 663 /* Read all sensor data through a command. */ 664 st->param.cmd = MOTIONSENSE_CMD_DATA; 665 ret = cros_ec_motion_send_host_cmd(st, sizeof(st->resp->data)); 666 if (ret != 0) { 667 dev_warn(&indio_dev->dev, "Unable to read sensor data\n"); 668 return ret; 669 } 670 671 for_each_set_bit(i, &scan_mask, indio_dev->masklength) { 672 *data = st->resp->data.data[i]; 673 data++; 674 } 675 676 return 0; 677 } 678 EXPORT_SYMBOL_GPL(cros_ec_sensors_read_cmd); 679 680 /** 681 * cros_ec_sensors_capture() - the trigger handler function 682 * @irq: the interrupt number. 683 * @p: a pointer to the poll function. 684 * 685 * On a trigger event occurring, if the pollfunc is attached then this 686 * handler is called as a threaded interrupt (and hence may sleep). It 687 * is responsible for grabbing data from the device and pushing it into 688 * the associated buffer. 689 * 690 * Return: IRQ_HANDLED 691 */ 692 irqreturn_t cros_ec_sensors_capture(int irq, void *p) 693 { 694 struct iio_poll_func *pf = p; 695 struct iio_dev *indio_dev = pf->indio_dev; 696 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 697 int ret; 698 699 mutex_lock(&st->cmd_lock); 700 701 /* Clear capture data. */ 702 memset(st->samples, 0, indio_dev->scan_bytes); 703 704 /* Read data based on which channels are enabled in scan mask. */ 705 ret = st->read_ec_sensors_data(indio_dev, 706 *(indio_dev->active_scan_mask), 707 (s16 *)st->samples); 708 if (ret < 0) 709 goto done; 710 711 iio_push_to_buffers_with_timestamp(indio_dev, st->samples, 712 iio_get_time_ns(indio_dev)); 713 714 done: 715 /* 716 * Tell the core we are done with this trigger and ready for the 717 * next one. 718 */ 719 iio_trigger_notify_done(indio_dev->trig); 720 721 mutex_unlock(&st->cmd_lock); 722 723 return IRQ_HANDLED; 724 } 725 EXPORT_SYMBOL_GPL(cros_ec_sensors_capture); 726 727 /** 728 * cros_ec_sensors_core_read() - function to request a value from the sensor 729 * @st: pointer to state information for device 730 * @chan: channel specification structure table 731 * @val: will contain one element making up the returned value 732 * @val2: will contain another element making up the returned value 733 * @mask: specifies which values to be requested 734 * 735 * Return: the type of value returned by the device 736 */ 737 int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st, 738 struct iio_chan_spec const *chan, 739 int *val, int *val2, long mask) 740 { 741 int ret, frequency; 742 743 switch (mask) { 744 case IIO_CHAN_INFO_SAMP_FREQ: 745 st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR; 746 st->param.sensor_odr.data = 747 EC_MOTION_SENSE_NO_VALUE; 748 749 ret = cros_ec_motion_send_host_cmd(st, 0); 750 if (ret) 751 break; 752 753 frequency = st->resp->sensor_odr.ret; 754 *val = frequency / 1000; 755 *val2 = (frequency % 1000) * 1000; 756 ret = IIO_VAL_INT_PLUS_MICRO; 757 break; 758 default: 759 ret = -EINVAL; 760 break; 761 } 762 763 return ret; 764 } 765 EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read); 766 767 /** 768 * cros_ec_sensors_core_read_avail() - get available values 769 * @indio_dev: pointer to state information for device 770 * @chan: channel specification structure table 771 * @vals: list of available values 772 * @type: type of data returned 773 * @length: number of data returned in the array 774 * @mask: specifies which values to be requested 775 * 776 * Return: an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST 777 */ 778 int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev, 779 struct iio_chan_spec const *chan, 780 const int **vals, 781 int *type, 782 int *length, 783 long mask) 784 { 785 struct cros_ec_sensors_core_state *state = iio_priv(indio_dev); 786 787 switch (mask) { 788 case IIO_CHAN_INFO_SAMP_FREQ: 789 *length = ARRAY_SIZE(state->frequencies); 790 *vals = (const int *)&state->frequencies; 791 *type = IIO_VAL_INT_PLUS_MICRO; 792 return IIO_AVAIL_LIST; 793 } 794 795 return -EINVAL; 796 } 797 EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail); 798 799 /** 800 * cros_ec_sensors_core_write() - function to write a value to the sensor 801 * @st: pointer to state information for device 802 * @chan: channel specification structure table 803 * @val: first part of value to write 804 * @val2: second part of value to write 805 * @mask: specifies which values to write 806 * 807 * Return: the type of value returned by the device 808 */ 809 int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st, 810 struct iio_chan_spec const *chan, 811 int val, int val2, long mask) 812 { 813 int ret, frequency; 814 815 switch (mask) { 816 case IIO_CHAN_INFO_SAMP_FREQ: 817 frequency = val * 1000 + val2 / 1000; 818 st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR; 819 st->param.sensor_odr.data = frequency; 820 821 /* Always roundup, so caller gets at least what it asks for. */ 822 st->param.sensor_odr.roundup = 1; 823 824 ret = cros_ec_motion_send_host_cmd(st, 0); 825 break; 826 default: 827 ret = -EINVAL; 828 break; 829 } 830 return ret; 831 } 832 EXPORT_SYMBOL_GPL(cros_ec_sensors_core_write); 833 834 static int __maybe_unused cros_ec_sensors_resume(struct device *dev) 835 { 836 struct platform_device *pdev = to_platform_device(dev); 837 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 838 struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); 839 int ret = 0; 840 841 if (st->range_updated) { 842 mutex_lock(&st->cmd_lock); 843 st->param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; 844 st->param.sensor_range.data = st->curr_range; 845 st->param.sensor_range.roundup = 1; 846 ret = cros_ec_motion_send_host_cmd(st, 0); 847 mutex_unlock(&st->cmd_lock); 848 } 849 return ret; 850 } 851 852 SIMPLE_DEV_PM_OPS(cros_ec_sensors_pm_ops, NULL, cros_ec_sensors_resume); 853 EXPORT_SYMBOL_GPL(cros_ec_sensors_pm_ops); 854 855 MODULE_DESCRIPTION("ChromeOS EC sensor hub core functions"); 856 MODULE_LICENSE("GPL v2"); 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