drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c

   1 /*
   2  * STMicroelectronics st_lsm6dsx i2c controller driver
   3  *
   4  * i2c controller embedded in lsm6dx series can connect up to four
   5  * slave devices using accelerometer sensor as trigger for i2c
   6  * read/write operations. Current implementation relies on SLV0 channel
   7  * for slave configuration and SLV{1,2,3} to read data and push them into
   8  * the hw FIFO
   9  *
  10  * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
  11  *
  12  * Permission to use, copy, modify, and/or distribute this software for any
  13  * purpose with or without fee is hereby granted, provided that the above
  14  * copyright notice and this permission notice appear in all copies.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  17  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  18  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  19  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  20  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  21  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  22  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  23  *
  24  */
  25 #include <linux/module.h>
  26 #include <linux/regmap.h>
  27 #include <linux/iio/iio.h>
  28 #include <linux/iio/sysfs.h>
  29 #include <linux/bitfield.h>
  30
  31 #include "st_lsm6dsx.h"
  32
  33 #define ST_LSM6DSX_SLV_ADDR(n, base)            ((base) + (n) * 3)
  34 #define ST_LSM6DSX_SLV_SUB_ADDR(n, base)        ((base) + 1 + (n) * 3)
  35 #define ST_LSM6DSX_SLV_CONFIG(n, base)          ((base) + 2 + (n) * 3)
  36
  37 #define ST_LS6DSX_READ_OP_MASK                  GENMASK(2, 0)
  38
  39 static const struct st_lsm6dsx_ext_dev_settings st_lsm6dsx_ext_dev_table[] = {
  40         /* LIS2MDL */
  41         {
  42                 .i2c_addr = { 0x1e },
  43                 .wai = {
  44                         .addr = 0x4f,
  45                         .val = 0x40,
  46                 },
  47                 .id = ST_LSM6DSX_ID_MAGN,
  48                 .odr_table = {
  49                         .reg = {
  50                                 .addr = 0x60,
  51                                 .mask = GENMASK(3, 2),
  52                         },
  53                         .odr_avl[0] = {  10000, 0x0 },
  54                         .odr_avl[1] = {  20000, 0x1 },
  55                         .odr_avl[2] = {  50000, 0x2 },
  56                         .odr_avl[3] = { 100000, 0x3 },
  57                         .odr_len = 4,
  58                 },
  59                 .fs_table = {
  60                         .fs_avl[0] = {
  61                                 .gain = 1500,
  62                                 .val = 0x0,
  63                         }, /* 1500 uG/LSB */
  64                         .fs_len = 1,
  65                 },
  66                 .temp_comp = {
  67                         .addr = 0x60,
  68                         .mask = BIT(7),
  69                 },
  70                 .pwr_table = {
  71                         .reg = {
  72                                 .addr = 0x60,
  73                                 .mask = GENMASK(1, 0),
  74                         },
  75                         .off_val = 0x2,
  76                         .on_val = 0x0,
  77                 },
  78                 .off_canc = {
  79                         .addr = 0x61,
  80                         .mask = BIT(1),
  81                 },
  82                 .bdu = {
  83                         .addr = 0x62,
  84                         .mask = BIT(4),
  85                 },
  86                 .out = {
  87                         .addr = 0x68,
  88                         .len = 6,
  89                 },
  90         },
  91 };
  92
  93 static void st_lsm6dsx_shub_wait_complete(struct st_lsm6dsx_hw *hw)
  94 {
  95         struct st_lsm6dsx_sensor *sensor;
  96         u32 odr;
  97
  98         sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
  99         odr = (hw->enable_mask & BIT(ST_LSM6DSX_ID_ACC)) ? sensor->odr : 12500;
 100         msleep((2000000U / odr) + 1);
 101 }
 102
 103 /**
 104  * st_lsm6dsx_shub_read_reg - read i2c controller register
 105  *
 106  * Read st_lsm6dsx i2c controller register
 107  */
 108 static int
 109 st_lsm6dsx_shub_read_reg(struct st_lsm6dsx_hw *hw, u8 *data,
 110                          int len)
 111 {
 112         const struct st_lsm6dsx_shub_settings *hub_settings;
 113         int err;
 114
 115         mutex_lock(&hw->page_lock);
 116
 117         hub_settings = &hw->settings->shub_settings;
 118         if (hub_settings->shub_out.sec_page) {
 119                 err = st_lsm6dsx_set_page(hw, true);
 120                 if (err < 0)
 121                         goto out;
 122         }
 123
 124         err = regmap_bulk_read(hw->regmap, hub_settings->shub_out.addr,
 125                                data, len);
 126
 127         if (hub_settings->shub_out.sec_page)
 128                 st_lsm6dsx_set_page(hw, false);
 129 out:
 130         mutex_unlock(&hw->page_lock);
 131
 132         return err;
 133 }
 134
 135 /**
 136  * st_lsm6dsx_shub_write_reg - write i2c controller register
 137  *
 138  * Write st_lsm6dsx i2c controller register
 139  */
 140 static int st_lsm6dsx_shub_write_reg(struct st_lsm6dsx_hw *hw, u8 addr,
 141                                      u8 *data, int len)
 142 {
 143         int err;
 144
 145         mutex_lock(&hw->page_lock);
 146         err = st_lsm6dsx_set_page(hw, true);
 147         if (err < 0)
 148                 goto out;
 149
 150         err = regmap_bulk_write(hw->regmap, addr, data, len);
 151
 152         st_lsm6dsx_set_page(hw, false);
 153 out:
 154         mutex_unlock(&hw->page_lock);
 155
 156         return err;
 157 }
 158
 159 static int
 160 st_lsm6dsx_shub_write_reg_with_mask(struct st_lsm6dsx_hw *hw, u8 addr,
 161                                     u8 mask, u8 val)
 162 {
 163         int err;
 164
 165         mutex_lock(&hw->page_lock);
 166         err = st_lsm6dsx_set_page(hw, true);
 167         if (err < 0)
 168                 goto out;
 169
 170         err = regmap_update_bits(hw->regmap, addr, mask, val);
 171
 172         st_lsm6dsx_set_page(hw, false);
 173 out:
 174         mutex_unlock(&hw->page_lock);
 175
 176         return err;
 177 }
 178
 179 static int st_lsm6dsx_shub_master_enable(struct st_lsm6dsx_sensor *sensor,
 180                                          bool enable)
 181 {
 182         const struct st_lsm6dsx_shub_settings *hub_settings;
 183         struct st_lsm6dsx_hw *hw = sensor->hw;
 184         unsigned int data;
 185         int err;
 186
 187         /* enable acc sensor as trigger */
 188         err = st_lsm6dsx_sensor_set_enable(sensor, enable);
 189         if (err < 0)
 190                 return err;
 191
 192         mutex_lock(&hw->page_lock);
 193
 194         hub_settings = &hw->settings->shub_settings;
 195         if (hub_settings->master_en.sec_page) {
 196                 err = st_lsm6dsx_set_page(hw, true);
 197                 if (err < 0)
 198                         goto out;
 199         }
 200
 201         data = ST_LSM6DSX_SHIFT_VAL(enable, hub_settings->master_en.mask);
 202         err = regmap_update_bits(hw->regmap, hub_settings->master_en.addr,
 203                                  hub_settings->master_en.mask, data);
 204
 205         if (hub_settings->master_en.sec_page)
 206                 st_lsm6dsx_set_page(hw, false);
 207 out:
 208         mutex_unlock(&hw->page_lock);
 209
 210         return err;
 211 }
 212
 213 /**
 214  * st_lsm6dsx_shub_read - read data from slave device register
 215  *
 216  * Read data from slave device register. SLV0 is used for
 217  * one-shot read operation
 218  */
 219 static int
 220 st_lsm6dsx_shub_read(struct st_lsm6dsx_sensor *sensor, u8 addr,
 221                      u8 *data, int len)
 222 {
 223         const struct st_lsm6dsx_shub_settings *hub_settings;
 224         struct st_lsm6dsx_hw *hw = sensor->hw;
 225         u8 config[3], slv_addr;
 226         int err;
 227
 228         hub_settings = &hw->settings->shub_settings;
 229         slv_addr = ST_LSM6DSX_SLV_ADDR(0, hub_settings->slv0_addr);
 230
 231         config[0] = (sensor->ext_info.addr << 1) | 1;
 232         config[1] = addr;
 233         config[2] = len & ST_LS6DSX_READ_OP_MASK;
 234
 235         err = st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 236                                         sizeof(config));
 237         if (err < 0)
 238                 return err;
 239
 240         err = st_lsm6dsx_shub_master_enable(sensor, true);
 241         if (err < 0)
 242                 return err;
 243
 244         st_lsm6dsx_shub_wait_complete(hw);
 245
 246         err = st_lsm6dsx_shub_read_reg(hw, data, len & ST_LS6DSX_READ_OP_MASK);
 247
 248         st_lsm6dsx_shub_master_enable(sensor, false);
 249
 250         memset(config, 0, sizeof(config));
 251         return st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 252                                          sizeof(config));
 253 }
 254
 255 /**
 256  * st_lsm6dsx_shub_write - write data to slave device register
 257  *
 258  * Write data from slave device register. SLV0 is used for
 259  * one-shot write operation
 260  */
 261 static int
 262 st_lsm6dsx_shub_write(struct st_lsm6dsx_sensor *sensor, u8 addr,
 263                       u8 *data, int len)
 264 {
 265         const struct st_lsm6dsx_shub_settings *hub_settings;
 266         struct st_lsm6dsx_hw *hw = sensor->hw;
 267         u8 config[2], slv_addr;
 268         int err, i;
 269
 270         hub_settings = &hw->settings->shub_settings;
 271         if (hub_settings->wr_once.addr) {
 272                 unsigned int data;
 273
 274                 data = ST_LSM6DSX_SHIFT_VAL(1, hub_settings->wr_once.mask);
 275                 err = st_lsm6dsx_shub_write_reg_with_mask(hw,
 276                         hub_settings->wr_once.addr,
 277                         hub_settings->wr_once.mask,
 278                         data);
 279                 if (err < 0)
 280                         return err;
 281         }
 282
 283         slv_addr = ST_LSM6DSX_SLV_ADDR(0, hub_settings->slv0_addr);
 284         config[0] = sensor->ext_info.addr << 1;
 285         for (i = 0 ; i < len; i++) {
 286                 config[1] = addr + i;
 287
 288                 err = st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 289                                                 sizeof(config));
 290                 if (err < 0)
 291                         return err;
 292
 293                 err = st_lsm6dsx_shub_write_reg(hw, hub_settings->dw_slv0_addr,
 294                                                 &data[i], 1);
 295                 if (err < 0)
 296                         return err;
 297
 298                 err = st_lsm6dsx_shub_master_enable(sensor, true);
 299                 if (err < 0)
 300                         return err;
 301
 302                 st_lsm6dsx_shub_wait_complete(hw);
 303
 304                 st_lsm6dsx_shub_master_enable(sensor, false);
 305         }
 306
 307         memset(config, 0, sizeof(config));
 308         return st_lsm6dsx_shub_write_reg(hw, slv_addr, config, sizeof(config));
 309 }
 310
 311 static int
 312 st_lsm6dsx_shub_write_with_mask(struct st_lsm6dsx_sensor *sensor,
 313                                 u8 addr, u8 mask, u8 val)
 314 {
 315         int err;
 316         u8 data;
 317
 318         err = st_lsm6dsx_shub_read(sensor, addr, &data, sizeof(data));
 319         if (err < 0)
 320                 return err;
 321
 322         data = ((data & ~mask) | (val << __ffs(mask) & mask));
 323
 324         return st_lsm6dsx_shub_write(sensor, addr, &data, sizeof(data));
 325 }
 326
 327 static int
 328 st_lsm6dsx_shub_get_odr_val(struct st_lsm6dsx_sensor *sensor,
 329                             u32 odr, u16 *val)
 330 {
 331         const struct st_lsm6dsx_ext_dev_settings *settings;
 332         int i;
 333
 334         settings = sensor->ext_info.settings;
 335         for (i = 0; i < settings->odr_table.odr_len; i++) {
 336                 if (settings->odr_table.odr_avl[i].milli_hz == odr)
 337                         break;
 338         }
 339
 340         if (i == settings->odr_table.odr_len)
 341                 return -EINVAL;
 342
 343         *val = settings->odr_table.odr_avl[i].val;
 344         return 0;
 345 }
 346
 347 static int
 348 st_lsm6dsx_shub_set_odr(struct st_lsm6dsx_sensor *sensor, u32 odr)
 349 {
 350         const struct st_lsm6dsx_ext_dev_settings *settings;
 351         u16 val;
 352         int err;
 353
 354         err = st_lsm6dsx_shub_get_odr_val(sensor, odr, &val);
 355         if (err < 0)
 356                 return err;
 357
 358         settings = sensor->ext_info.settings;
 359         return st_lsm6dsx_shub_write_with_mask(sensor,
 360                                                settings->odr_table.reg.addr,
 361                                                settings->odr_table.reg.mask,
 362                                                val);
 363 }
 364
 365 /* use SLV{1,2,3} for FIFO read operations */
 366 static int
 367 st_lsm6dsx_shub_config_channels(struct st_lsm6dsx_sensor *sensor,
 368                                 bool enable)
 369 {
 370         const struct st_lsm6dsx_shub_settings *hub_settings;
 371         const struct st_lsm6dsx_ext_dev_settings *settings;
 372         u8 config[9] = {}, enable_mask, slv_addr;
 373         struct st_lsm6dsx_hw *hw = sensor->hw;
 374         struct st_lsm6dsx_sensor *cur_sensor;
 375         int i, j = 0;
 376
 377         hub_settings = &hw->settings->shub_settings;
 378         if (enable)
 379                 enable_mask = hw->enable_mask | BIT(sensor->id);
 380         else
 381                 enable_mask = hw->enable_mask & ~BIT(sensor->id);
 382
 383         for (i = ST_LSM6DSX_ID_EXT0; i <= ST_LSM6DSX_ID_EXT2; i++) {
 384                 if (!hw->iio_devs[i])
 385                         continue;
 386
 387                 cur_sensor = iio_priv(hw->iio_devs[i]);
 388                 if (!(enable_mask & BIT(cur_sensor->id)))
 389                         continue;
 390
 391                 settings = cur_sensor->ext_info.settings;
 392                 config[j] = (sensor->ext_info.addr << 1) | 1;
 393                 config[j + 1] = settings->out.addr;
 394                 config[j + 2] = (settings->out.len & ST_LS6DSX_READ_OP_MASK) |
 395                                 hub_settings->batch_en;
 396                 j += 3;
 397         }
 398
 399         slv_addr = ST_LSM6DSX_SLV_ADDR(1, hub_settings->slv0_addr);
 400         return st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 401                                          sizeof(config));
 402 }
 403
 404 int st_lsm6dsx_shub_set_enable(struct st_lsm6dsx_sensor *sensor, bool enable)
 405 {
 406         const struct st_lsm6dsx_ext_dev_settings *settings;
 407         int err;
 408
 409         err = st_lsm6dsx_shub_config_channels(sensor, enable);
 410         if (err < 0)
 411                 return err;
 412
 413         settings = sensor->ext_info.settings;
 414         if (enable) {
 415                 err = st_lsm6dsx_shub_set_odr(sensor, sensor->odr);
 416                 if (err < 0)
 417                         return err;
 418         } else {
 419                 err = st_lsm6dsx_shub_write_with_mask(sensor,
 420                                         settings->odr_table.reg.addr,
 421                                         settings->odr_table.reg.mask, 0);
 422                 if (err < 0)
 423                         return err;
 424         }
 425
 426         if (settings->pwr_table.reg.addr) {
 427                 u8 val;
 428
 429                 val = enable ? settings->pwr_table.on_val
 430                              : settings->pwr_table.off_val;
 431                 err = st_lsm6dsx_shub_write_with_mask(sensor,
 432                                         settings->pwr_table.reg.addr,
 433                                         settings->pwr_table.reg.mask, val);
 434                 if (err < 0)
 435                         return err;
 436         }
 437
 438         return st_lsm6dsx_shub_master_enable(sensor, enable);
 439 }
 440
 441 static int
 442 st_lsm6dsx_shub_read_oneshot(struct st_lsm6dsx_sensor *sensor,
 443                              struct iio_chan_spec const *ch,
 444                              int *val)
 445 {
 446         int err, delay, len;
 447         u8 data[4];
 448
 449         err = st_lsm6dsx_shub_set_enable(sensor, true);
 450         if (err < 0)
 451                 return err;
 452
 453         delay = 1000000000 / sensor->odr;
 454         usleep_range(delay, 2 * delay);
 455
 456         len = min_t(int, sizeof(data), ch->scan_type.realbits >> 3);
 457         err = st_lsm6dsx_shub_read(sensor, ch->address, data, len);
 458
 459         st_lsm6dsx_shub_set_enable(sensor, false);
 460
 461         if (err < 0)
 462                 return err;
 463
 464         switch (len) {
 465         case 2:
 466                 *val = (s16)le16_to_cpu(*((__le16 *)data));
 467                 break;
 468         default:
 469                 return -EINVAL;
 470         }
 471
 472         return IIO_VAL_INT;
 473 }
 474
 475 static int
 476 st_lsm6dsx_shub_read_raw(struct iio_dev *iio_dev,
 477                          struct iio_chan_spec const *ch,
 478                          int *val, int *val2, long mask)
 479 {
 480         struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
 481         int ret;
 482
 483         switch (mask) {
 484         case IIO_CHAN_INFO_RAW:
 485                 ret = iio_device_claim_direct_mode(iio_dev);
 486                 if (ret)
 487                         break;
 488
 489                 ret = st_lsm6dsx_shub_read_oneshot(sensor, ch, val);
 490                 iio_device_release_direct_mode(iio_dev);
 491                 break;
 492         case IIO_CHAN_INFO_SAMP_FREQ:
 493                 *val = sensor->odr / 1000;
 494                 *val2 = (sensor->odr % 1000) * 1000;
 495                 ret = IIO_VAL_INT_PLUS_MICRO;
 496                 break;
 497         case IIO_CHAN_INFO_SCALE:
 498                 *val = 0;
 499                 *val2 = sensor->gain;
 500                 ret = IIO_VAL_INT_PLUS_MICRO;
 501                 break;
 502         default:
 503                 ret = -EINVAL;
 504                 break;
 505         }
 506
 507         return ret;
 508 }
 509
 510 static int
 511 st_lsm6dsx_shub_write_raw(struct iio_dev *iio_dev,
 512                           struct iio_chan_spec const *chan,
 513                           int val, int val2, long mask)
 514 {
 515         struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
 516         int err;
 517
 518         err = iio_device_claim_direct_mode(iio_dev);
 519         if (err)
 520                 return err;
 521
 522         switch (mask) {
 523         case IIO_CHAN_INFO_SAMP_FREQ: {
 524                 u16 data;
 525
 526                 val = val * 1000 + val2 / 1000;
 527                 err = st_lsm6dsx_shub_get_odr_val(sensor, val, &data);
 528                 if (!err)
 529                         sensor->odr = val;
 530                 break;
 531         }
 532         default:
 533                 err = -EINVAL;
 534                 break;
 535         }
 536
 537         iio_device_release_direct_mode(iio_dev);
 538
 539         return err;
 540 }
 541
 542 static ssize_t
 543 st_lsm6dsx_shub_sampling_freq_avail(struct device *dev,
 544                                     struct device_attribute *attr,
 545                                     char *buf)
 546 {
 547         struct st_lsm6dsx_sensor *sensor = iio_priv(dev_get_drvdata(dev));
 548         const struct st_lsm6dsx_ext_dev_settings *settings;
 549         int i, len = 0;
 550
 551         settings = sensor->ext_info.settings;
 552         for (i = 0; i < settings->odr_table.odr_len; i++) {
 553                 u32 val = settings->odr_table.odr_avl[i].milli_hz;
 554
 555                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%03d ",
 556                                  val / 1000, val % 1000);
 557         }
 558         buf[len - 1] = '\n';
 559
 560         return len;
 561 }
 562
 563 static ssize_t st_lsm6dsx_shub_scale_avail(struct device *dev,
 564                                            struct device_attribute *attr,
 565                                            char *buf)
 566 {
 567         struct st_lsm6dsx_sensor *sensor = iio_priv(dev_get_drvdata(dev));
 568         const struct st_lsm6dsx_ext_dev_settings *settings;
 569         int i, len = 0;
 570
 571         settings = sensor->ext_info.settings;
 572         for (i = 0; i < settings->fs_table.fs_len; i++)
 573                 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
 574                                  settings->fs_table.fs_avl[i].gain);
 575         buf[len - 1] = '\n';
 576
 577         return len;
 578 }
 579
 580 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(st_lsm6dsx_shub_sampling_freq_avail);
 581 static IIO_DEVICE_ATTR(in_scale_available, 0444,
 582                        st_lsm6dsx_shub_scale_avail, NULL, 0);
 583 static struct attribute *st_lsm6dsx_ext_attributes[] = {
 584         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 585         &iio_dev_attr_in_scale_available.dev_attr.attr,
 586         NULL,
 587 };
 588
 589 static const struct attribute_group st_lsm6dsx_ext_attribute_group = {
 590         .attrs = st_lsm6dsx_ext_attributes,
 591 };
 592
 593 static const struct iio_info st_lsm6dsx_ext_info = {
 594         .attrs = &st_lsm6dsx_ext_attribute_group,
 595         .read_raw = st_lsm6dsx_shub_read_raw,
 596         .write_raw = st_lsm6dsx_shub_write_raw,
 597         .hwfifo_set_watermark = st_lsm6dsx_set_watermark,
 598 };
 599
 600 static struct iio_dev *
 601 st_lsm6dsx_shub_alloc_iiodev(struct st_lsm6dsx_hw *hw,
 602                              enum st_lsm6dsx_sensor_id id,
 603                              const struct st_lsm6dsx_ext_dev_settings *info,
 604                              u8 i2c_addr, const char *name)
 605 {
 606         struct iio_chan_spec *ext_channels;
 607         struct st_lsm6dsx_sensor *sensor;
 608         struct iio_dev *iio_dev;
 609
 610         iio_dev = devm_iio_device_alloc(hw->dev, sizeof(*sensor));
 611         if (!iio_dev)
 612                 return NULL;
 613
 614         iio_dev->modes = INDIO_DIRECT_MODE;
 615         iio_dev->dev.parent = hw->dev;
 616         iio_dev->info = &st_lsm6dsx_ext_info;
 617
 618         sensor = iio_priv(iio_dev);
 619         sensor->id = id;
 620         sensor->hw = hw;
 621         sensor->odr = info->odr_table.odr_avl[0].milli_hz;
 622         sensor->gain = info->fs_table.fs_avl[0].gain;
 623         sensor->ext_info.settings = info;
 624         sensor->ext_info.addr = i2c_addr;
 625         sensor->watermark = 1;
 626
 627         switch (info->id) {
 628         case ST_LSM6DSX_ID_MAGN: {
 629                 const struct iio_chan_spec magn_channels[] = {
 630                         ST_LSM6DSX_CHANNEL(IIO_MAGN, info->out.addr,
 631                                            IIO_MOD_X, 0),
 632                         ST_LSM6DSX_CHANNEL(IIO_MAGN, info->out.addr + 2,
 633                                            IIO_MOD_Y, 1),
 634                         ST_LSM6DSX_CHANNEL(IIO_MAGN, info->out.addr + 4,
 635                                            IIO_MOD_Z, 2),
 636                         IIO_CHAN_SOFT_TIMESTAMP(3),
 637                 };
 638
 639                 ext_channels = devm_kzalloc(hw->dev, sizeof(magn_channels),
 640                                             GFP_KERNEL);
 641                 if (!ext_channels)
 642                         return NULL;
 643
 644                 memcpy(ext_channels, magn_channels, sizeof(magn_channels));
 645                 iio_dev->available_scan_masks = st_lsm6dsx_available_scan_masks;
 646                 iio_dev->channels = ext_channels;
 647                 iio_dev->num_channels = ARRAY_SIZE(magn_channels);
 648
 649                 scnprintf(sensor->name, sizeof(sensor->name), "%s_magn",
 650                           name);
 651                 break;
 652         }
 653         default:
 654                 return NULL;
 655         }
 656         iio_dev->name = sensor->name;
 657
 658         return iio_dev;
 659 }
 660
 661 static int st_lsm6dsx_shub_init_device(struct st_lsm6dsx_sensor *sensor)
 662 {
 663         const struct st_lsm6dsx_ext_dev_settings *settings;
 664         int err;
 665
 666         settings = sensor->ext_info.settings;
 667         if (settings->bdu.addr) {
 668                 err = st_lsm6dsx_shub_write_with_mask(sensor,
 669                                                       settings->bdu.addr,
 670                                                       settings->bdu.mask, 1);
 671                 if (err < 0)
 672                         return err;
 673         }
 674
 675         if (settings->temp_comp.addr) {
 676                 err = st_lsm6dsx_shub_write_with_mask(sensor,
 677                                         settings->temp_comp.addr,
 678                                         settings->temp_comp.mask, 1);
 679                 if (err < 0)
 680                         return err;
 681         }
 682
 683         if (settings->off_canc.addr) {
 684                 err = st_lsm6dsx_shub_write_with_mask(sensor,
 685                                         settings->off_canc.addr,
 686                                         settings->off_canc.mask, 1);
 687                 if (err < 0)
 688                         return err;
 689         }
 690
 691         return 0;
 692 }
 693
 694 static int
 695 st_lsm6dsx_shub_check_wai(struct st_lsm6dsx_hw *hw, u8 *i2c_addr,
 696                           const struct st_lsm6dsx_ext_dev_settings *settings)
 697 {
 698         const struct st_lsm6dsx_shub_settings *hub_settings;
 699         struct st_lsm6dsx_sensor *sensor;
 700         u8 config[3], data, slv_addr;
 701         bool found = false;
 702         int i, err;
 703
 704         hub_settings = &hw->settings->shub_settings;
 705         slv_addr = ST_LSM6DSX_SLV_ADDR(0, hub_settings->slv0_addr);
 706         sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
 707
 708         for (i = 0; i < ARRAY_SIZE(settings->i2c_addr); i++) {
 709                 if (!settings->i2c_addr[i])
 710                         continue;
 711
 712                 /* read wai slave register */
 713                 config[0] = (settings->i2c_addr[i] << 1) | 0x1;
 714                 config[1] = settings->wai.addr;
 715                 config[2] = 0x1;
 716
 717                 err = st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 718                                                 sizeof(config));
 719                 if (err < 0)
 720                         return err;
 721
 722                 err = st_lsm6dsx_shub_master_enable(sensor, true);
 723                 if (err < 0)
 724                         return err;
 725
 726                 st_lsm6dsx_shub_wait_complete(hw);
 727
 728                 err = st_lsm6dsx_shub_read_reg(hw, &data, sizeof(data));
 729
 730                 st_lsm6dsx_shub_master_enable(sensor, false);
 731
 732                 if (err < 0)
 733                         return err;
 734
 735                 if (data != settings->wai.val)
 736                         continue;
 737
 738                 *i2c_addr = settings->i2c_addr[i];
 739                 found = true;
 740                 break;
 741         }
 742
 743         /* reset SLV0 channel */
 744         memset(config, 0, sizeof(config));
 745         err = st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 746                                         sizeof(config));
 747         if (err < 0)
 748                 return err;
 749
 750         return found ? 0 : -ENODEV;
 751 }
 752
 753 int st_lsm6dsx_shub_probe(struct st_lsm6dsx_hw *hw, const char *name)
 754 {
 755         enum st_lsm6dsx_sensor_id id = ST_LSM6DSX_ID_EXT0;
 756         struct st_lsm6dsx_sensor *sensor;
 757         int err, i, num_ext_dev = 0;
 758         u8 i2c_addr = 0;
 759
 760         for (i = 0; i < ARRAY_SIZE(st_lsm6dsx_ext_dev_table); i++) {
 761                 err = st_lsm6dsx_shub_check_wai(hw, &i2c_addr,
 762                                         &st_lsm6dsx_ext_dev_table[i]);
 763                 if (err == -ENODEV)
 764                         continue;
 765                 else if (err < 0)
 766                         return err;
 767
 768                 hw->iio_devs[id] = st_lsm6dsx_shub_alloc_iiodev(hw, id,
 769                                                 &st_lsm6dsx_ext_dev_table[i],
 770                                                 i2c_addr, name);
 771                 if (!hw->iio_devs[id])
 772                         return -ENOMEM;
 773
 774                 sensor = iio_priv(hw->iio_devs[id]);
 775                 err = st_lsm6dsx_shub_init_device(sensor);
 776                 if (err < 0)
 777                         return err;
 778
 779                 if (++num_ext_dev >= hw->settings->shub_settings.num_ext_dev)
 780                         break;
 781                 id++;
 782         }
 783
 784         return 0;
 785 }