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