drivers/iio/gyro/bmg160.c

   1 /*
   2  * BMG160 Gyro Sensor driver
   3  * Copyright (c) 2014, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/i2c.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/delay.h>
  19 #include <linux/slab.h>
  20 #include <linux/acpi.h>
  21 #include <linux/gpio/consumer.h>
  22 #include <linux/pm.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/iio/iio.h>
  25 #include <linux/iio/sysfs.h>
  26 #include <linux/iio/buffer.h>
  27 #include <linux/iio/trigger.h>
  28 #include <linux/iio/events.h>
  29 #include <linux/iio/trigger_consumer.h>
  30 #include <linux/iio/triggered_buffer.h>
  31
  32 #define BMG160_DRV_NAME         "bmg160"
  33 #define BMG160_IRQ_NAME         "bmg160_event"
  34 #define BMG160_GPIO_NAME                "gpio_int"
  35
  36 #define BMG160_REG_CHIP_ID              0x00
  37 #define BMG160_CHIP_ID_VAL              0x0F
  38
  39 #define BMG160_REG_PMU_LPW              0x11
  40 #define BMG160_MODE_NORMAL              0x00
  41 #define BMG160_MODE_DEEP_SUSPEND        0x20
  42 #define BMG160_MODE_SUSPEND             0x80
  43
  44 #define BMG160_REG_RANGE                0x0F
  45
  46 #define BMG160_RANGE_2000DPS            0
  47 #define BMG160_RANGE_1000DPS            1
  48 #define BMG160_RANGE_500DPS             2
  49 #define BMG160_RANGE_250DPS             3
  50 #define BMG160_RANGE_125DPS             4
  51
  52 #define BMG160_REG_PMU_BW               0x10
  53 #define BMG160_NO_FILTER                0
  54 #define BMG160_DEF_BW                   100
  55
  56 #define BMG160_REG_INT_MAP_0            0x17
  57 #define BMG160_INT_MAP_0_BIT_ANY        BIT(1)
  58
  59 #define BMG160_REG_INT_MAP_1            0x18
  60 #define BMG160_INT_MAP_1_BIT_NEW_DATA   BIT(0)
  61
  62 #define BMG160_REG_INT_RST_LATCH        0x21
  63 #define BMG160_INT_MODE_LATCH_RESET     0x80
  64 #define BMG160_INT_MODE_LATCH_INT       0x0F
  65 #define BMG160_INT_MODE_NON_LATCH_INT   0x00
  66
  67 #define BMG160_REG_INT_EN_0             0x15
  68 #define BMG160_DATA_ENABLE_INT          BIT(7)
  69
  70 #define BMG160_REG_INT_EN_1             0x16
  71 #define BMG160_INT1_BIT_OD              BIT(1)
  72
  73 #define BMG160_REG_XOUT_L               0x02
  74 #define BMG160_AXIS_TO_REG(axis)        (BMG160_REG_XOUT_L + (axis * 2))
  75
  76 #define BMG160_REG_SLOPE_THRES          0x1B
  77 #define BMG160_SLOPE_THRES_MASK 0x0F
  78
  79 #define BMG160_REG_MOTION_INTR          0x1C
  80 #define BMG160_INT_MOTION_X             BIT(0)
  81 #define BMG160_INT_MOTION_Y             BIT(1)
  82 #define BMG160_INT_MOTION_Z             BIT(2)
  83 #define BMG160_ANY_DUR_MASK             0x30
  84 #define BMG160_ANY_DUR_SHIFT            4
  85
  86 #define BMG160_REG_INT_STATUS_2 0x0B
  87 #define BMG160_ANY_MOTION_MASK          0x07
  88 #define BMG160_ANY_MOTION_BIT_X         BIT(0)
  89 #define BMG160_ANY_MOTION_BIT_Y         BIT(1)
  90 #define BMG160_ANY_MOTION_BIT_Z         BIT(2)
  91
  92 #define BMG160_REG_TEMP         0x08
  93 #define BMG160_TEMP_CENTER_VAL          23
  94
  95 #define BMG160_MAX_STARTUP_TIME_MS      80
  96
  97 #define BMG160_AUTO_SUSPEND_DELAY_MS    2000
  98
  99 struct bmg160_data {
 100         struct i2c_client *client;
 101         struct iio_trigger *dready_trig;
 102         struct iio_trigger *motion_trig;
 103         struct mutex mutex;
 104         s16 buffer[8];
 105         u8 bw_bits;
 106         u32 dps_range;
 107         int ev_enable_state;
 108         int slope_thres;
 109         bool dready_trigger_on;
 110         bool motion_trigger_on;
 111 };
 112
 113 enum bmg160_axis {
 114         AXIS_X,
 115         AXIS_Y,
 116         AXIS_Z,
 117 };
 118
 119 static const struct {
 120         int val;
 121         int bw_bits;
 122 } bmg160_samp_freq_table[] = { {100, 0x07},
 123                                {200, 0x06},
 124                                {400, 0x03},
 125                                {1000, 0x02},
 126                                {2000, 0x01} };
 127
 128 static const struct {
 129         int scale;
 130         int dps_range;
 131 } bmg160_scale_table[] = { { 1065, BMG160_RANGE_2000DPS},
 132                            { 532, BMG160_RANGE_1000DPS},
 133                            { 266, BMG160_RANGE_500DPS},
 134                            { 133, BMG160_RANGE_250DPS},
 135                            { 66, BMG160_RANGE_125DPS} };
 136
 137 static int bmg160_set_mode(struct bmg160_data *data, u8 mode)
 138 {
 139         int ret;
 140
 141         ret = i2c_smbus_write_byte_data(data->client,
 142                                         BMG160_REG_PMU_LPW, mode);
 143         if (ret < 0) {
 144                 dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n");
 145                 return ret;
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int bmg160_convert_freq_to_bit(int val)
 152 {
 153         int i;
 154
 155         for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) {
 156                 if (bmg160_samp_freq_table[i].val == val)
 157                         return bmg160_samp_freq_table[i].bw_bits;
 158         }
 159
 160         return -EINVAL;
 161 }
 162
 163 static int bmg160_set_bw(struct bmg160_data *data, int val)
 164 {
 165         int ret;
 166         int bw_bits;
 167
 168         bw_bits = bmg160_convert_freq_to_bit(val);
 169         if (bw_bits < 0)
 170                 return bw_bits;
 171
 172         ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_PMU_BW,
 173                                         bw_bits);
 174         if (ret < 0) {
 175                 dev_err(&data->client->dev, "Error writing reg_pmu_bw\n");
 176                 return ret;
 177         }
 178
 179         data->bw_bits = bw_bits;
 180
 181         return 0;
 182 }
 183
 184 static int bmg160_chip_init(struct bmg160_data *data)
 185 {
 186         int ret;
 187
 188         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_CHIP_ID);
 189         if (ret < 0) {
 190                 dev_err(&data->client->dev, "Error reading reg_chip_id\n");
 191                 return ret;
 192         }
 193
 194         dev_dbg(&data->client->dev, "Chip Id %x\n", ret);
 195         if (ret != BMG160_CHIP_ID_VAL) {
 196                 dev_err(&data->client->dev, "invalid chip %x\n", ret);
 197                 return -ENODEV;
 198         }
 199
 200         ret = bmg160_set_mode(data, BMG160_MODE_NORMAL);
 201         if (ret < 0)
 202                 return ret;
 203
 204         /* Wait upto 500 ms to be ready after changing mode */
 205         usleep_range(500, 1000);
 206
 207         /* Set Bandwidth */
 208         ret = bmg160_set_bw(data, BMG160_DEF_BW);
 209         if (ret < 0)
 210                 return ret;
 211
 212         /* Set Default Range */
 213         ret = i2c_smbus_write_byte_data(data->client,
 214                                         BMG160_REG_RANGE,
 215                                         BMG160_RANGE_500DPS);
 216         if (ret < 0) {
 217                 dev_err(&data->client->dev, "Error writing reg_range\n");
 218                 return ret;
 219         }
 220         data->dps_range = BMG160_RANGE_500DPS;
 221
 222         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_SLOPE_THRES);
 223         if (ret < 0) {
 224                 dev_err(&data->client->dev, "Error reading reg_slope_thres\n");
 225                 return ret;
 226         }
 227         data->slope_thres = ret;
 228
 229         /* Set default interrupt mode */
 230         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_EN_1);
 231         if (ret < 0) {
 232                 dev_err(&data->client->dev, "Error reading reg_int_en_1\n");
 233                 return ret;
 234         }
 235         ret &= ~BMG160_INT1_BIT_OD;
 236         ret = i2c_smbus_write_byte_data(data->client,
 237                                         BMG160_REG_INT_EN_1, ret);
 238         if (ret < 0) {
 239                 dev_err(&data->client->dev, "Error writing reg_int_en_1\n");
 240                 return ret;
 241         }
 242
 243         ret = i2c_smbus_write_byte_data(data->client,
 244                                         BMG160_REG_INT_RST_LATCH,
 245                                         BMG160_INT_MODE_LATCH_INT |
 246                                         BMG160_INT_MODE_LATCH_RESET);
 247         if (ret < 0) {
 248                 dev_err(&data->client->dev,
 249                         "Error writing reg_motion_intr\n");
 250                 return ret;
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int bmg160_set_power_state(struct bmg160_data *data, bool on)
 257 {
 258 #ifdef CONFIG_PM
 259         int ret;
 260
 261         if (on)
 262                 ret = pm_runtime_get_sync(&data->client->dev);
 263         else {
 264                 pm_runtime_mark_last_busy(&data->client->dev);
 265                 ret = pm_runtime_put_autosuspend(&data->client->dev);
 266         }
 267
 268         if (ret < 0) {
 269                 dev_err(&data->client->dev,
 270                         "Failed: bmg160_set_power_state for %d\n", on);
 271                 if (on)
 272                         pm_runtime_put_noidle(&data->client->dev);
 273
 274                 return ret;
 275         }
 276 #endif
 277
 278         return 0;
 279 }
 280
 281 static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
 282                                              bool status)
 283 {
 284         int ret;
 285
 286         /* Enable/Disable INT_MAP0 mapping */
 287         ret = i2c_smbus_read_byte_data(data->client,  BMG160_REG_INT_MAP_0);
 288         if (ret < 0) {
 289                 dev_err(&data->client->dev, "Error reading reg_int_map0\n");
 290                 return ret;
 291         }
 292         if (status)
 293                 ret |= BMG160_INT_MAP_0_BIT_ANY;
 294         else
 295                 ret &= ~BMG160_INT_MAP_0_BIT_ANY;
 296
 297         ret = i2c_smbus_write_byte_data(data->client,
 298                                         BMG160_REG_INT_MAP_0,
 299                                         ret);
 300         if (ret < 0) {
 301                 dev_err(&data->client->dev, "Error writing reg_int_map0\n");
 302                 return ret;
 303         }
 304
 305         /* Enable/Disable slope interrupts */
 306         if (status) {
 307                 /* Update slope thres */
 308                 ret = i2c_smbus_write_byte_data(data->client,
 309                                                 BMG160_REG_SLOPE_THRES,
 310                                                 data->slope_thres);
 311                 if (ret < 0) {
 312                         dev_err(&data->client->dev,
 313                                 "Error writing reg_slope_thres\n");
 314                         return ret;
 315                 }
 316
 317                 ret = i2c_smbus_write_byte_data(data->client,
 318                                                 BMG160_REG_MOTION_INTR,
 319                                                 BMG160_INT_MOTION_X |
 320                                                 BMG160_INT_MOTION_Y |
 321                                                 BMG160_INT_MOTION_Z);
 322                 if (ret < 0) {
 323                         dev_err(&data->client->dev,
 324                                 "Error writing reg_motion_intr\n");
 325                         return ret;
 326                 }
 327
 328                 /*
 329                  * New data interrupt is always non-latched,
 330                  * which will have higher priority, so no need
 331                  * to set latched mode, we will be flooded anyway with INTR
 332                  */
 333                 if (!data->dready_trigger_on) {
 334                         ret = i2c_smbus_write_byte_data(data->client,
 335                                                 BMG160_REG_INT_RST_LATCH,
 336                                                 BMG160_INT_MODE_LATCH_INT |
 337                                                 BMG160_INT_MODE_LATCH_RESET);
 338                         if (ret < 0) {
 339                                 dev_err(&data->client->dev,
 340                                         "Error writing reg_rst_latch\n");
 341                                 return ret;
 342                         }
 343                 }
 344
 345                 ret = i2c_smbus_write_byte_data(data->client,
 346                                                 BMG160_REG_INT_EN_0,
 347                                                 BMG160_DATA_ENABLE_INT);
 348
 349         } else
 350                 ret = i2c_smbus_write_byte_data(data->client,
 351                                                 BMG160_REG_INT_EN_0,
 352                                                 0);
 353
 354         if (ret < 0) {
 355                 dev_err(&data->client->dev, "Error writing reg_int_en0\n");
 356                 return ret;
 357         }
 358
 359         return 0;
 360 }
 361
 362 static int bmg160_setup_new_data_interrupt(struct bmg160_data *data,
 363                                            bool status)
 364 {
 365         int ret;
 366
 367         /* Enable/Disable INT_MAP1 mapping */
 368         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_1);
 369         if (ret < 0) {
 370                 dev_err(&data->client->dev, "Error reading reg_int_map1\n");
 371                 return ret;
 372         }
 373
 374         if (status)
 375                 ret |= BMG160_INT_MAP_1_BIT_NEW_DATA;
 376         else
 377                 ret &= ~BMG160_INT_MAP_1_BIT_NEW_DATA;
 378
 379         ret = i2c_smbus_write_byte_data(data->client,
 380                                         BMG160_REG_INT_MAP_1,
 381                                         ret);
 382         if (ret < 0) {
 383                 dev_err(&data->client->dev, "Error writing reg_int_map1\n");
 384                 return ret;
 385         }
 386
 387         if (status) {
 388                 ret = i2c_smbus_write_byte_data(data->client,
 389                                                 BMG160_REG_INT_RST_LATCH,
 390                                                 BMG160_INT_MODE_NON_LATCH_INT |
 391                                                 BMG160_INT_MODE_LATCH_RESET);
 392                 if (ret < 0) {
 393                         dev_err(&data->client->dev,
 394                                 "Error writing reg_rst_latch\n");
 395                                 return ret;
 396                 }
 397
 398                 ret = i2c_smbus_write_byte_data(data->client,
 399                                                 BMG160_REG_INT_EN_0,
 400                                                 BMG160_DATA_ENABLE_INT);
 401
 402         } else {
 403                 /* Restore interrupt mode */
 404                 ret = i2c_smbus_write_byte_data(data->client,
 405                                                 BMG160_REG_INT_RST_LATCH,
 406                                                 BMG160_INT_MODE_LATCH_INT |
 407                                                 BMG160_INT_MODE_LATCH_RESET);
 408                 if (ret < 0) {
 409                         dev_err(&data->client->dev,
 410                                 "Error writing reg_rst_latch\n");
 411                                 return ret;
 412                 }
 413
 414                 ret = i2c_smbus_write_byte_data(data->client,
 415                                                 BMG160_REG_INT_EN_0,
 416                                                 0);
 417         }
 418
 419         if (ret < 0) {
 420                 dev_err(&data->client->dev, "Error writing reg_int_en0\n");
 421                 return ret;
 422         }
 423
 424         return 0;
 425 }
 426
 427 static int bmg160_get_bw(struct bmg160_data *data, int *val)
 428 {
 429         int i;
 430
 431         for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) {
 432                 if (bmg160_samp_freq_table[i].bw_bits == data->bw_bits) {
 433                         *val = bmg160_samp_freq_table[i].val;
 434                         return IIO_VAL_INT;
 435                 }
 436         }
 437
 438         return -EINVAL;
 439 }
 440
 441 static int bmg160_set_scale(struct bmg160_data *data, int val)
 442 {
 443         int ret, i;
 444
 445         for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) {
 446                 if (bmg160_scale_table[i].scale == val) {
 447                         ret = i2c_smbus_write_byte_data(
 448                                         data->client,
 449                                         BMG160_REG_RANGE,
 450                                         bmg160_scale_table[i].dps_range);
 451                         if (ret < 0) {
 452                                 dev_err(&data->client->dev,
 453                                         "Error writing reg_range\n");
 454                                 return ret;
 455                         }
 456                         data->dps_range = bmg160_scale_table[i].dps_range;
 457                         return 0;
 458                 }
 459         }
 460
 461         return -EINVAL;
 462 }
 463
 464 static int bmg160_get_temp(struct bmg160_data *data, int *val)
 465 {
 466         int ret;
 467
 468         mutex_lock(&data->mutex);
 469         ret = bmg160_set_power_state(data, true);
 470         if (ret < 0) {
 471                 mutex_unlock(&data->mutex);
 472                 return ret;
 473         }
 474
 475         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_TEMP);
 476         if (ret < 0) {
 477                 dev_err(&data->client->dev, "Error reading reg_temp\n");
 478                 bmg160_set_power_state(data, false);
 479                 mutex_unlock(&data->mutex);
 480                 return ret;
 481         }
 482
 483         *val = sign_extend32(ret, 7);
 484         ret = bmg160_set_power_state(data, false);
 485         mutex_unlock(&data->mutex);
 486         if (ret < 0)
 487                 return ret;
 488
 489         return IIO_VAL_INT;
 490 }
 491
 492 static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
 493 {
 494         int ret;
 495
 496         mutex_lock(&data->mutex);
 497         ret = bmg160_set_power_state(data, true);
 498         if (ret < 0) {
 499                 mutex_unlock(&data->mutex);
 500                 return ret;
 501         }
 502
 503         ret = i2c_smbus_read_word_data(data->client, BMG160_AXIS_TO_REG(axis));
 504         if (ret < 0) {
 505                 dev_err(&data->client->dev, "Error reading axis %d\n", axis);
 506                 bmg160_set_power_state(data, false);
 507                 mutex_unlock(&data->mutex);
 508                 return ret;
 509         }
 510
 511         *val = sign_extend32(ret, 15);
 512         ret = bmg160_set_power_state(data, false);
 513         mutex_unlock(&data->mutex);
 514         if (ret < 0)
 515                 return ret;
 516
 517         return IIO_VAL_INT;
 518 }
 519
 520 static int bmg160_read_raw(struct iio_dev *indio_dev,
 521                            struct iio_chan_spec const *chan,
 522                            int *val, int *val2, long mask)
 523 {
 524         struct bmg160_data *data = iio_priv(indio_dev);
 525         int ret;
 526
 527         switch (mask) {
 528         case IIO_CHAN_INFO_RAW:
 529                 switch (chan->type) {
 530                 case IIO_TEMP:
 531                         return bmg160_get_temp(data, val);
 532                 case IIO_ANGL_VEL:
 533                         if (iio_buffer_enabled(indio_dev))
 534                                 return -EBUSY;
 535                         else
 536                                 return bmg160_get_axis(data, chan->scan_index,
 537                                                        val);
 538                 default:
 539                         return -EINVAL;
 540                 }
 541         case IIO_CHAN_INFO_OFFSET:
 542                 if (chan->type == IIO_TEMP) {
 543                         *val = BMG160_TEMP_CENTER_VAL;
 544                         return IIO_VAL_INT;
 545                 } else
 546                         return -EINVAL;
 547         case IIO_CHAN_INFO_SCALE:
 548                 *val = 0;
 549                 switch (chan->type) {
 550                 case IIO_TEMP:
 551                         *val2 = 500000;
 552                         return IIO_VAL_INT_PLUS_MICRO;
 553                 case IIO_ANGL_VEL:
 554                 {
 555                         int i;
 556
 557                         for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) {
 558                                 if (bmg160_scale_table[i].dps_range ==
 559                                                         data->dps_range) {
 560                                         *val2 = bmg160_scale_table[i].scale;
 561                                         return IIO_VAL_INT_PLUS_MICRO;
 562                                 }
 563                         }
 564                         return -EINVAL;
 565                 }
 566                 default:
 567                         return -EINVAL;
 568                 }
 569         case IIO_CHAN_INFO_SAMP_FREQ:
 570                 *val2 = 0;
 571                 mutex_lock(&data->mutex);
 572                 ret = bmg160_get_bw(data, val);
 573                 mutex_unlock(&data->mutex);
 574                 return ret;
 575         default:
 576                 return -EINVAL;
 577         }
 578 }
 579
 580 static int bmg160_write_raw(struct iio_dev *indio_dev,
 581                             struct iio_chan_spec const *chan,
 582                             int val, int val2, long mask)
 583 {
 584         struct bmg160_data *data = iio_priv(indio_dev);
 585         int ret;
 586
 587         switch (mask) {
 588         case IIO_CHAN_INFO_SAMP_FREQ:
 589                 mutex_lock(&data->mutex);
 590                 /*
 591                  * Section 4.2 of spec
 592                  * In suspend mode, the only supported operations are reading
 593                  * registers as well as writing to the (0x14) softreset
 594                  * register. Since we will be in suspend mode by default, change
 595                  * mode to power on for other writes.
 596                  */
 597                 ret = bmg160_set_power_state(data, true);
 598                 if (ret < 0) {
 599                         mutex_unlock(&data->mutex);
 600                         return ret;
 601                 }
 602                 ret = bmg160_set_bw(data, val);
 603                 if (ret < 0) {
 604                         bmg160_set_power_state(data, false);
 605                         mutex_unlock(&data->mutex);
 606                         return ret;
 607                 }
 608                 ret = bmg160_set_power_state(data, false);
 609                 mutex_unlock(&data->mutex);
 610                 return ret;
 611         case IIO_CHAN_INFO_SCALE:
 612                 if (val)
 613                         return -EINVAL;
 614
 615                 mutex_lock(&data->mutex);
 616                 /* Refer to comments above for the suspend mode ops */
 617                 ret = bmg160_set_power_state(data, true);
 618                 if (ret < 0) {
 619                         mutex_unlock(&data->mutex);
 620                         return ret;
 621                 }
 622                 ret = bmg160_set_scale(data, val2);
 623                 if (ret < 0) {
 624                         bmg160_set_power_state(data, false);
 625                         mutex_unlock(&data->mutex);
 626                         return ret;
 627                 }
 628                 ret = bmg160_set_power_state(data, false);
 629                 mutex_unlock(&data->mutex);
 630                 return ret;
 631         default:
 632                 return -EINVAL;
 633         }
 634
 635         return -EINVAL;
 636 }
 637
 638 static int bmg160_read_event(struct iio_dev *indio_dev,
 639                              const struct iio_chan_spec *chan,
 640                              enum iio_event_type type,
 641                              enum iio_event_direction dir,
 642                              enum iio_event_info info,
 643                              int *val, int *val2)
 644 {
 645         struct bmg160_data *data = iio_priv(indio_dev);
 646
 647         *val2 = 0;
 648         switch (info) {
 649         case IIO_EV_INFO_VALUE:
 650                 *val = data->slope_thres & BMG160_SLOPE_THRES_MASK;
 651                 break;
 652         default:
 653                 return -EINVAL;
 654         }
 655
 656         return IIO_VAL_INT;
 657 }
 658
 659 static int bmg160_write_event(struct iio_dev *indio_dev,
 660                               const struct iio_chan_spec *chan,
 661                               enum iio_event_type type,
 662                               enum iio_event_direction dir,
 663                               enum iio_event_info info,
 664                               int val, int val2)
 665 {
 666         struct bmg160_data *data = iio_priv(indio_dev);
 667
 668         switch (info) {
 669         case IIO_EV_INFO_VALUE:
 670                 if (data->ev_enable_state)
 671                         return -EBUSY;
 672                 data->slope_thres &= ~BMG160_SLOPE_THRES_MASK;
 673                 data->slope_thres |= (val & BMG160_SLOPE_THRES_MASK);
 674                 break;
 675         default:
 676                 return -EINVAL;
 677         }
 678
 679         return 0;
 680 }
 681
 682 static int bmg160_read_event_config(struct iio_dev *indio_dev,
 683                                     const struct iio_chan_spec *chan,
 684                                     enum iio_event_type type,
 685                                     enum iio_event_direction dir)
 686 {
 687
 688         struct bmg160_data *data = iio_priv(indio_dev);
 689
 690         return data->ev_enable_state;
 691 }
 692
 693 static int bmg160_write_event_config(struct iio_dev *indio_dev,
 694                                      const struct iio_chan_spec *chan,
 695                                      enum iio_event_type type,
 696                                      enum iio_event_direction dir,
 697                                      int state)
 698 {
 699         struct bmg160_data *data = iio_priv(indio_dev);
 700         int ret;
 701
 702         if (state && data->ev_enable_state)
 703                 return 0;
 704
 705         mutex_lock(&data->mutex);
 706
 707         if (!state && data->motion_trigger_on) {
 708                 data->ev_enable_state = 0;
 709                 mutex_unlock(&data->mutex);
 710                 return 0;
 711         }
 712         /*
 713          * We will expect the enable and disable to do operation in
 714          * in reverse order. This will happen here anyway as our
 715          * resume operation uses sync mode runtime pm calls, the
 716          * suspend operation will be delayed by autosuspend delay
 717          * So the disable operation will still happen in reverse of
 718          * enable operation. When runtime pm is disabled the mode
 719          * is always on so sequence doesn't matter
 720          */
 721         ret = bmg160_set_power_state(data, state);
 722         if (ret < 0) {
 723                 mutex_unlock(&data->mutex);
 724                 return ret;
 725         }
 726
 727         ret =  bmg160_setup_any_motion_interrupt(data, state);
 728         if (ret < 0) {
 729                 bmg160_set_power_state(data, false);
 730                 mutex_unlock(&data->mutex);
 731                 return ret;
 732         }
 733
 734         data->ev_enable_state = state;
 735         mutex_unlock(&data->mutex);
 736
 737         return 0;
 738 }
 739
 740 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("100 200 400 1000 2000");
 741
 742 static IIO_CONST_ATTR(in_anglvel_scale_available,
 743                       "0.001065 0.000532 0.000266 0.000133 0.000066");
 744
 745 static struct attribute *bmg160_attributes[] = {
 746         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 747         &iio_const_attr_in_anglvel_scale_available.dev_attr.attr,
 748         NULL,
 749 };
 750
 751 static const struct attribute_group bmg160_attrs_group = {
 752         .attrs = bmg160_attributes,
 753 };
 754
 755 static const struct iio_event_spec bmg160_event = {
 756                 .type = IIO_EV_TYPE_ROC,
 757                 .dir = IIO_EV_DIR_EITHER,
 758                 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
 759                                        BIT(IIO_EV_INFO_ENABLE)
 760 };
 761
 762 #define BMG160_CHANNEL(_axis) {                                 \
 763         .type = IIO_ANGL_VEL,                                           \
 764         .modified = 1,                                                  \
 765         .channel2 = IIO_MOD_##_axis,                                    \
 766         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
 767         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
 768                                     BIT(IIO_CHAN_INFO_SAMP_FREQ),       \
 769         .scan_index = AXIS_##_axis,                                     \
 770         .scan_type = {                                                  \
 771                 .sign = 's',                                            \
 772                 .realbits = 16,                                 \
 773                 .storagebits = 16,                                      \
 774         },                                                              \
 775         .event_spec = &bmg160_event,                                    \
 776         .num_event_specs = 1                                            \
 777 }
 778
 779 static const struct iio_chan_spec bmg160_channels[] = {
 780         {
 781                 .type = IIO_TEMP,
 782                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 783                                       BIT(IIO_CHAN_INFO_SCALE) |
 784                                       BIT(IIO_CHAN_INFO_OFFSET),
 785                 .scan_index = -1,
 786         },
 787         BMG160_CHANNEL(X),
 788         BMG160_CHANNEL(Y),
 789         BMG160_CHANNEL(Z),
 790         IIO_CHAN_SOFT_TIMESTAMP(3),
 791 };
 792
 793 static const struct iio_info bmg160_info = {
 794         .attrs                  = &bmg160_attrs_group,
 795         .read_raw               = bmg160_read_raw,
 796         .write_raw              = bmg160_write_raw,
 797         .read_event_value       = bmg160_read_event,
 798         .write_event_value      = bmg160_write_event,
 799         .write_event_config     = bmg160_write_event_config,
 800         .read_event_config      = bmg160_read_event_config,
 801         .driver_module          = THIS_MODULE,
 802 };
 803
 804 static irqreturn_t bmg160_trigger_handler(int irq, void *p)
 805 {
 806         struct iio_poll_func *pf = p;
 807         struct iio_dev *indio_dev = pf->indio_dev;
 808         struct bmg160_data *data = iio_priv(indio_dev);
 809         int bit, ret, i = 0;
 810
 811         mutex_lock(&data->mutex);
 812         for_each_set_bit(bit, indio_dev->active_scan_mask,
 813                          indio_dev->masklength) {
 814                 ret = i2c_smbus_read_word_data(data->client,
 815                                                BMG160_AXIS_TO_REG(bit));
 816                 if (ret < 0) {
 817                         mutex_unlock(&data->mutex);
 818                         goto err;
 819                 }
 820                 data->buffer[i++] = ret;
 821         }
 822         mutex_unlock(&data->mutex);
 823
 824         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 825                                            pf->timestamp);
 826 err:
 827         iio_trigger_notify_done(indio_dev->trig);
 828
 829         return IRQ_HANDLED;
 830 }
 831
 832 static int bmg160_trig_try_reen(struct iio_trigger *trig)
 833 {
 834         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 835         struct bmg160_data *data = iio_priv(indio_dev);
 836         int ret;
 837
 838         /* new data interrupts don't need ack */
 839         if (data->dready_trigger_on)
 840                 return 0;
 841
 842         /* Set latched mode interrupt and clear any latched interrupt */
 843         ret = i2c_smbus_write_byte_data(data->client,
 844                                         BMG160_REG_INT_RST_LATCH,
 845                                         BMG160_INT_MODE_LATCH_INT |
 846                                         BMG160_INT_MODE_LATCH_RESET);
 847         if (ret < 0) {
 848                 dev_err(&data->client->dev, "Error writing reg_rst_latch\n");
 849                 return ret;
 850         }
 851
 852         return 0;
 853 }
 854
 855 static int bmg160_data_rdy_trigger_set_state(struct iio_trigger *trig,
 856                                              bool state)
 857 {
 858         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 859         struct bmg160_data *data = iio_priv(indio_dev);
 860         int ret;
 861
 862         mutex_lock(&data->mutex);
 863
 864         if (!state && data->ev_enable_state && data->motion_trigger_on) {
 865                 data->motion_trigger_on = false;
 866                 mutex_unlock(&data->mutex);
 867                 return 0;
 868         }
 869
 870         /*
 871          * Refer to comment in bmg160_write_event_config for
 872          * enable/disable operation order
 873          */
 874         ret = bmg160_set_power_state(data, state);
 875         if (ret < 0) {
 876                 mutex_unlock(&data->mutex);
 877                 return ret;
 878         }
 879         if (data->motion_trig == trig)
 880                 ret =  bmg160_setup_any_motion_interrupt(data, state);
 881         else
 882                 ret = bmg160_setup_new_data_interrupt(data, state);
 883         if (ret < 0) {
 884                 bmg160_set_power_state(data, false);
 885                 mutex_unlock(&data->mutex);
 886                 return ret;
 887         }
 888         if (data->motion_trig == trig)
 889                 data->motion_trigger_on = state;
 890         else
 891                 data->dready_trigger_on = state;
 892
 893         mutex_unlock(&data->mutex);
 894
 895         return 0;
 896 }
 897
 898 static const struct iio_trigger_ops bmg160_trigger_ops = {
 899         .set_trigger_state = bmg160_data_rdy_trigger_set_state,
 900         .try_reenable = bmg160_trig_try_reen,
 901         .owner = THIS_MODULE,
 902 };
 903
 904 static irqreturn_t bmg160_event_handler(int irq, void *private)
 905 {
 906         struct iio_dev *indio_dev = private;
 907         struct bmg160_data *data = iio_priv(indio_dev);
 908         int ret;
 909         int dir;
 910
 911         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_STATUS_2);
 912         if (ret < 0) {
 913                 dev_err(&data->client->dev, "Error reading reg_int_status2\n");
 914                 goto ack_intr_status;
 915         }
 916
 917         if (ret & 0x08)
 918                 dir = IIO_EV_DIR_RISING;
 919         else
 920                 dir = IIO_EV_DIR_FALLING;
 921
 922         if (ret & BMG160_ANY_MOTION_BIT_X)
 923                 iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
 924                                                         0,
 925                                                         IIO_MOD_X,
 926                                                         IIO_EV_TYPE_ROC,
 927                                                         dir),
 928                                                         iio_get_time_ns());
 929         if (ret & BMG160_ANY_MOTION_BIT_Y)
 930                 iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
 931                                                         0,
 932                                                         IIO_MOD_Y,
 933                                                         IIO_EV_TYPE_ROC,
 934                                                         dir),
 935                                                         iio_get_time_ns());
 936         if (ret & BMG160_ANY_MOTION_BIT_Z)
 937                 iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
 938                                                         0,
 939                                                         IIO_MOD_Z,
 940                                                         IIO_EV_TYPE_ROC,
 941                                                         dir),
 942                                                         iio_get_time_ns());
 943
 944 ack_intr_status:
 945         if (!data->dready_trigger_on) {
 946                 ret = i2c_smbus_write_byte_data(data->client,
 947                                         BMG160_REG_INT_RST_LATCH,
 948                                         BMG160_INT_MODE_LATCH_INT |
 949                                         BMG160_INT_MODE_LATCH_RESET);
 950                 if (ret < 0)
 951                         dev_err(&data->client->dev,
 952                                 "Error writing reg_rst_latch\n");
 953         }
 954
 955         return IRQ_HANDLED;
 956 }
 957
 958 static irqreturn_t bmg160_data_rdy_trig_poll(int irq, void *private)
 959 {
 960         struct iio_dev *indio_dev = private;
 961         struct bmg160_data *data = iio_priv(indio_dev);
 962
 963         if (data->dready_trigger_on)
 964                 iio_trigger_poll(data->dready_trig);
 965         else if (data->motion_trigger_on)
 966                 iio_trigger_poll(data->motion_trig);
 967
 968         if (data->ev_enable_state)
 969                 return IRQ_WAKE_THREAD;
 970         else
 971                 return IRQ_HANDLED;
 972
 973 }
 974
 975 static int bmg160_buffer_preenable(struct iio_dev *indio_dev)
 976 {
 977         struct bmg160_data *data = iio_priv(indio_dev);
 978
 979         return bmg160_set_power_state(data, true);
 980 }
 981
 982 static int bmg160_buffer_postdisable(struct iio_dev *indio_dev)
 983 {
 984         struct bmg160_data *data = iio_priv(indio_dev);
 985
 986         return bmg160_set_power_state(data, false);
 987 }
 988
 989 static const struct iio_buffer_setup_ops bmg160_buffer_setup_ops = {
 990         .preenable = bmg160_buffer_preenable,
 991         .postenable = iio_triggered_buffer_postenable,
 992         .predisable = iio_triggered_buffer_predisable,
 993         .postdisable = bmg160_buffer_postdisable,
 994 };
 995
 996 static int bmg160_gpio_probe(struct i2c_client *client,
 997                              struct bmg160_data *data)
 998
 999 {
1000         struct device *dev;
1001         struct gpio_desc *gpio;
1002         int ret;
1003
1004         if (!client)
1005                 return -EINVAL;
1006
1007         dev = &client->dev;
1008
1009         /* data ready gpio interrupt pin */
1010         gpio = devm_gpiod_get_index(dev, BMG160_GPIO_NAME, 0, GPIOD_IN);
1011         if (IS_ERR(gpio)) {
1012                 dev_err(dev, "acpi gpio get index failed\n");
1013                 return PTR_ERR(gpio);
1014         }
1015
1016         ret = gpiod_to_irq(gpio);
1017
1018         dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
1019
1020         return ret;
1021 }
1022
1023 static const char *bmg160_match_acpi_device(struct device *dev)
1024 {
1025         const struct acpi_device_id *id;
1026
1027         id = acpi_match_device(dev->driver->acpi_match_table, dev);
1028         if (!id)
1029                 return NULL;
1030
1031         return dev_name(dev);
1032 }
1033
1034 static int bmg160_probe(struct i2c_client *client,
1035                         const struct i2c_device_id *id)
1036 {
1037         struct bmg160_data *data;
1038         struct iio_dev *indio_dev;
1039         int ret;
1040         const char *name = NULL;
1041
1042         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1043         if (!indio_dev)
1044                 return -ENOMEM;
1045
1046         data = iio_priv(indio_dev);
1047         i2c_set_clientdata(client, indio_dev);
1048         data->client = client;
1049
1050         ret = bmg160_chip_init(data);
1051         if (ret < 0)
1052                 return ret;
1053
1054         mutex_init(&data->mutex);
1055
1056         if (id)
1057                 name = id->name;
1058
1059         if (ACPI_HANDLE(&client->dev))
1060                 name = bmg160_match_acpi_device(&client->dev);
1061
1062         indio_dev->dev.parent = &client->dev;
1063         indio_dev->channels = bmg160_channels;
1064         indio_dev->num_channels = ARRAY_SIZE(bmg160_channels);
1065         indio_dev->name = name;
1066         indio_dev->modes = INDIO_DIRECT_MODE;
1067         indio_dev->info = &bmg160_info;
1068
1069         if (client->irq <= 0)
1070                 client->irq = bmg160_gpio_probe(client, data);
1071
1072         if (client->irq > 0) {
1073                 ret = devm_request_threaded_irq(&client->dev,
1074                                                 client->irq,
1075                                                 bmg160_data_rdy_trig_poll,
1076                                                 bmg160_event_handler,
1077                                                 IRQF_TRIGGER_RISING,
1078                                                 BMG160_IRQ_NAME,
1079                                                 indio_dev);
1080                 if (ret)
1081                         return ret;
1082
1083                 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
1084                                                            "%s-dev%d",
1085                                                            indio_dev->name,
1086                                                            indio_dev->id);
1087                 if (!data->dready_trig)
1088                         return -ENOMEM;
1089
1090                 data->motion_trig = devm_iio_trigger_alloc(&client->dev,
1091                                                           "%s-any-motion-dev%d",
1092                                                           indio_dev->name,
1093                                                           indio_dev->id);
1094                 if (!data->motion_trig)
1095                         return -ENOMEM;
1096
1097                 data->dready_trig->dev.parent = &client->dev;
1098                 data->dready_trig->ops = &bmg160_trigger_ops;
1099                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
1100                 ret = iio_trigger_register(data->dready_trig);
1101                 if (ret)
1102                         return ret;
1103
1104                 data->motion_trig->dev.parent = &client->dev;
1105                 data->motion_trig->ops = &bmg160_trigger_ops;
1106                 iio_trigger_set_drvdata(data->motion_trig, indio_dev);
1107                 ret = iio_trigger_register(data->motion_trig);
1108                 if (ret) {
1109                         data->motion_trig = NULL;
1110                         goto err_trigger_unregister;
1111                 }
1112         }
1113
1114         ret = iio_triggered_buffer_setup(indio_dev,
1115                                          iio_pollfunc_store_time,
1116                                          bmg160_trigger_handler,
1117                                          &bmg160_buffer_setup_ops);
1118         if (ret < 0) {
1119                 dev_err(&client->dev,
1120                         "iio triggered buffer setup failed\n");
1121                 goto err_trigger_unregister;
1122         }
1123
1124         ret = iio_device_register(indio_dev);
1125         if (ret < 0) {
1126                 dev_err(&client->dev, "unable to register iio device\n");
1127                 goto err_buffer_cleanup;
1128         }
1129
1130         ret = pm_runtime_set_active(&client->dev);
1131         if (ret)
1132                 goto err_iio_unregister;
1133
1134         pm_runtime_enable(&client->dev);
1135         pm_runtime_set_autosuspend_delay(&client->dev,
1136                                          BMG160_AUTO_SUSPEND_DELAY_MS);
1137         pm_runtime_use_autosuspend(&client->dev);
1138
1139         return 0;
1140
1141 err_iio_unregister:
1142         iio_device_unregister(indio_dev);
1143 err_buffer_cleanup:
1144         iio_triggered_buffer_cleanup(indio_dev);
1145 err_trigger_unregister:
1146         if (data->dready_trig)
1147                 iio_trigger_unregister(data->dready_trig);
1148         if (data->motion_trig)
1149                 iio_trigger_unregister(data->motion_trig);
1150
1151         return ret;
1152 }
1153
1154 static int bmg160_remove(struct i2c_client *client)
1155 {
1156         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1157         struct bmg160_data *data = iio_priv(indio_dev);
1158
1159         pm_runtime_disable(&client->dev);
1160         pm_runtime_set_suspended(&client->dev);
1161         pm_runtime_put_noidle(&client->dev);
1162
1163         iio_device_unregister(indio_dev);
1164         iio_triggered_buffer_cleanup(indio_dev);
1165
1166         if (data->dready_trig) {
1167                 iio_trigger_unregister(data->dready_trig);
1168                 iio_trigger_unregister(data->motion_trig);
1169         }
1170
1171         mutex_lock(&data->mutex);
1172         bmg160_set_mode(data, BMG160_MODE_DEEP_SUSPEND);
1173         mutex_unlock(&data->mutex);
1174
1175         return 0;
1176 }
1177
1178 #ifdef CONFIG_PM_SLEEP
1179 static int bmg160_suspend(struct device *dev)
1180 {
1181         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1182         struct bmg160_data *data = iio_priv(indio_dev);
1183
1184         mutex_lock(&data->mutex);
1185         bmg160_set_mode(data, BMG160_MODE_SUSPEND);
1186         mutex_unlock(&data->mutex);
1187
1188         return 0;
1189 }
1190
1191 static int bmg160_resume(struct device *dev)
1192 {
1193         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1194         struct bmg160_data *data = iio_priv(indio_dev);
1195
1196         mutex_lock(&data->mutex);
1197         if (data->dready_trigger_on || data->motion_trigger_on ||
1198                                                         data->ev_enable_state)
1199                 bmg160_set_mode(data, BMG160_MODE_NORMAL);
1200         mutex_unlock(&data->mutex);
1201
1202         return 0;
1203 }
1204 #endif
1205
1206 #ifdef CONFIG_PM
1207 static int bmg160_runtime_suspend(struct device *dev)
1208 {
1209         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1210         struct bmg160_data *data = iio_priv(indio_dev);
1211         int ret;
1212
1213         ret = bmg160_set_mode(data, BMG160_MODE_SUSPEND);
1214         if (ret < 0) {
1215                 dev_err(&data->client->dev, "set mode failed\n");
1216                 return -EAGAIN;
1217         }
1218
1219         return 0;
1220 }
1221
1222 static int bmg160_runtime_resume(struct device *dev)
1223 {
1224         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1225         struct bmg160_data *data = iio_priv(indio_dev);
1226         int ret;
1227
1228         ret = bmg160_set_mode(data, BMG160_MODE_NORMAL);
1229         if (ret < 0)
1230                 return ret;
1231
1232         msleep_interruptible(BMG160_MAX_STARTUP_TIME_MS);
1233
1234         return 0;
1235 }
1236 #endif
1237
1238 static const struct dev_pm_ops bmg160_pm_ops = {
1239         SET_SYSTEM_SLEEP_PM_OPS(bmg160_suspend, bmg160_resume)
1240         SET_RUNTIME_PM_OPS(bmg160_runtime_suspend,
1241                            bmg160_runtime_resume, NULL)
1242 };
1243
1244 static const struct acpi_device_id bmg160_acpi_match[] = {
1245         {"BMG0160", 0},
1246         {"BMI055B", 0},
1247         {},
1248 };
1249
1250 MODULE_DEVICE_TABLE(acpi, bmg160_acpi_match);
1251
1252 static const struct i2c_device_id bmg160_id[] = {
1253         {"bmg160", 0},
1254         {"bmi055_gyro", 0},
1255         {}
1256 };
1257
1258 MODULE_DEVICE_TABLE(i2c, bmg160_id);
1259
1260 static struct i2c_driver bmg160_driver = {
1261         .driver = {
1262                 .name   = BMG160_DRV_NAME,
1263                 .acpi_match_table = ACPI_PTR(bmg160_acpi_match),
1264                 .pm     = &bmg160_pm_ops,
1265         },
1266         .probe          = bmg160_probe,
1267         .remove         = bmg160_remove,
1268         .id_table       = bmg160_id,
1269 };
1270 module_i2c_driver(bmg160_driver);
1271
1272 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
1273 MODULE_LICENSE("GPL v2");
1274 MODULE_DESCRIPTION("BMG160 Gyro driver");