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_XOUT_L               0x02
  71 #define BMG160_AXIS_TO_REG(axis)        (BMG160_REG_XOUT_L + (axis * 2))
  72
  73 #define BMG160_REG_SLOPE_THRES          0x1B
  74 #define BMG160_SLOPE_THRES_MASK 0x0F
  75
  76 #define BMG160_REG_MOTION_INTR          0x1C
  77 #define BMG160_INT_MOTION_X             BIT(0)
  78 #define BMG160_INT_MOTION_Y             BIT(1)
  79 #define BMG160_INT_MOTION_Z             BIT(2)
  80 #define BMG160_ANY_DUR_MASK             0x30
  81 #define BMG160_ANY_DUR_SHIFT            4
  82
  83 #define BMG160_REG_INT_STATUS_2 0x0B
  84 #define BMG160_ANY_MOTION_MASK          0x07
  85
  86 #define BMG160_REG_TEMP         0x08
  87 #define BMG160_TEMP_CENTER_VAL          23
  88
  89 #define BMG160_MAX_STARTUP_TIME_MS      80
  90
  91 #define BMG160_AUTO_SUSPEND_DELAY_MS    2000
  92
  93 struct bmg160_data {
  94         struct i2c_client *client;
  95         struct iio_trigger *dready_trig;
  96         struct iio_trigger *motion_trig;
  97         struct mutex mutex;
  98         s16 buffer[8];
  99         u8 bw_bits;
 100         u32 dps_range;
 101         int ev_enable_state;
 102         int slope_thres;
 103         bool dready_trigger_on;
 104         bool motion_trigger_on;
 105         int64_t timestamp;
 106 };
 107
 108 enum bmg160_axis {
 109         AXIS_X,
 110         AXIS_Y,
 111         AXIS_Z,
 112 };
 113
 114 static const struct {
 115         int val;
 116         int bw_bits;
 117 } bmg160_samp_freq_table[] = { {100, 0x07},
 118                                {200, 0x06},
 119                                {400, 0x03},
 120                                {1000, 0x02},
 121                                {2000, 0x01} };
 122
 123 static const struct {
 124         int scale;
 125         int dps_range;
 126 } bmg160_scale_table[] = { { 1065, BMG160_RANGE_2000DPS},
 127                            { 532, BMG160_RANGE_1000DPS},
 128                            { 266, BMG160_RANGE_500DPS},
 129                            { 133, BMG160_RANGE_250DPS},
 130                            { 66, BMG160_RANGE_125DPS} };
 131
 132 static int bmg160_set_mode(struct bmg160_data *data, u8 mode)
 133 {
 134         int ret;
 135
 136         ret = i2c_smbus_write_byte_data(data->client,
 137                                         BMG160_REG_PMU_LPW, mode);
 138         if (ret < 0) {
 139                 dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n");
 140                 return ret;
 141         }
 142
 143         return 0;
 144 }
 145
 146 static int bmg160_convert_freq_to_bit(int val)
 147 {
 148         int i;
 149
 150         for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) {
 151                 if (bmg160_samp_freq_table[i].val == val)
 152                         return bmg160_samp_freq_table[i].bw_bits;
 153         }
 154
 155         return -EINVAL;
 156 }
 157
 158 static int bmg160_set_bw(struct bmg160_data *data, int val)
 159 {
 160         int ret;
 161         int bw_bits;
 162
 163         bw_bits = bmg160_convert_freq_to_bit(val);
 164         if (bw_bits < 0)
 165                 return bw_bits;
 166
 167         ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_PMU_BW,
 168                                         bw_bits);
 169         if (ret < 0) {
 170                 dev_err(&data->client->dev, "Error writing reg_pmu_bw\n");
 171                 return ret;
 172         }
 173
 174         data->bw_bits = bw_bits;
 175
 176         return 0;
 177 }
 178
 179 static int bmg160_chip_init(struct bmg160_data *data)
 180 {
 181         int ret;
 182
 183         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_CHIP_ID);
 184         if (ret < 0) {
 185                 dev_err(&data->client->dev, "Error reading reg_chip_id\n");
 186                 return ret;
 187         }
 188
 189         dev_dbg(&data->client->dev, "Chip Id %x\n", ret);
 190         if (ret != BMG160_CHIP_ID_VAL) {
 191                 dev_err(&data->client->dev, "invalid chip %x\n", ret);
 192                 return -ENODEV;
 193         }
 194
 195         ret = bmg160_set_mode(data, BMG160_MODE_NORMAL);
 196         if (ret < 0)
 197                 return ret;
 198
 199         /* Wait upto 500 ms to be ready after changing mode */
 200         usleep_range(500, 1000);
 201
 202         /* Set Bandwidth */
 203         ret = bmg160_set_bw(data, BMG160_DEF_BW);
 204         if (ret < 0)
 205                 return ret;
 206
 207         /* Set Default Range */
 208         ret = i2c_smbus_write_byte_data(data->client,
 209                                         BMG160_REG_RANGE,
 210                                         BMG160_RANGE_500DPS);
 211         if (ret < 0) {
 212                 dev_err(&data->client->dev, "Error writing reg_range\n");
 213                 return ret;
 214         }
 215         data->dps_range = BMG160_RANGE_500DPS;
 216
 217         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_SLOPE_THRES);
 218         if (ret < 0) {
 219                 dev_err(&data->client->dev, "Error reading reg_slope_thres\n");
 220                 return ret;
 221         }
 222         data->slope_thres = ret;
 223
 224         /* Set default interrupt mode */
 225         ret = i2c_smbus_write_byte_data(data->client,
 226                                         BMG160_REG_INT_RST_LATCH,
 227                                         BMG160_INT_MODE_LATCH_INT |
 228                                         BMG160_INT_MODE_LATCH_RESET);
 229         if (ret < 0) {
 230                 dev_err(&data->client->dev,
 231                         "Error writing reg_motion_intr\n");
 232                 return ret;
 233         }
 234
 235         return 0;
 236 }
 237
 238 static int bmg160_set_power_state(struct bmg160_data *data, bool on)
 239 {
 240 #ifdef CONFIG_PM_RUNTIME
 241         int ret;
 242
 243         if (on)
 244                 ret = pm_runtime_get_sync(&data->client->dev);
 245         else {
 246                 pm_runtime_mark_last_busy(&data->client->dev);
 247                 ret = pm_runtime_put_autosuspend(&data->client->dev);
 248         }
 249
 250         if (ret < 0) {
 251                 dev_err(&data->client->dev,
 252                         "Failed: bmg160_set_power_state for %d\n", on);
 253                 return ret;
 254         }
 255 #endif
 256
 257         return 0;
 258 }
 259
 260 static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
 261                                              bool status)
 262 {
 263         int ret;
 264
 265         /* Enable/Disable INT_MAP0 mapping */
 266         ret = i2c_smbus_read_byte_data(data->client,  BMG160_REG_INT_MAP_0);
 267         if (ret < 0) {
 268                 dev_err(&data->client->dev, "Error reading reg_int_map0\n");
 269                 return ret;
 270         }
 271         if (status)
 272                 ret |= BMG160_INT_MAP_0_BIT_ANY;
 273         else
 274                 ret &= ~BMG160_INT_MAP_0_BIT_ANY;
 275
 276         ret = i2c_smbus_write_byte_data(data->client,
 277                                         BMG160_REG_INT_MAP_0,
 278                                         ret);
 279         if (ret < 0) {
 280                 dev_err(&data->client->dev, "Error writing reg_int_map0\n");
 281                 return ret;
 282         }
 283
 284         /* Enable/Disable slope interrupts */
 285         if (status) {
 286                 /* Update slope thres */
 287                 ret = i2c_smbus_write_byte_data(data->client,
 288                                                 BMG160_REG_SLOPE_THRES,
 289                                                 data->slope_thres);
 290                 if (ret < 0) {
 291                         dev_err(&data->client->dev,
 292                                 "Error writing reg_slope_thres\n");
 293                         return ret;
 294                 }
 295
 296                 ret = i2c_smbus_write_byte_data(data->client,
 297                                                 BMG160_REG_MOTION_INTR,
 298                                                 BMG160_INT_MOTION_X |
 299                                                 BMG160_INT_MOTION_Y |
 300                                                 BMG160_INT_MOTION_Z);
 301                 if (ret < 0) {
 302                         dev_err(&data->client->dev,
 303                                 "Error writing reg_motion_intr\n");
 304                         return ret;
 305                 }
 306
 307                 /*
 308                  * New data interrupt is always non-latched,
 309                  * which will have higher priority, so no need
 310                  * to set latched mode, we will be flooded anyway with INTR
 311                  */
 312                 if (!data->dready_trigger_on) {
 313                         ret = i2c_smbus_write_byte_data(data->client,
 314                                                 BMG160_REG_INT_RST_LATCH,
 315                                                 BMG160_INT_MODE_LATCH_INT |
 316                                                 BMG160_INT_MODE_LATCH_RESET);
 317                         if (ret < 0) {
 318                                 dev_err(&data->client->dev,
 319                                         "Error writing reg_rst_latch\n");
 320                                 return ret;
 321                         }
 322                 }
 323
 324                 ret = i2c_smbus_write_byte_data(data->client,
 325                                                 BMG160_REG_INT_EN_0,
 326                                                 BMG160_DATA_ENABLE_INT);
 327
 328         } else
 329                 ret = i2c_smbus_write_byte_data(data->client,
 330                                                 BMG160_REG_INT_EN_0,
 331                                                 0);
 332
 333         if (ret < 0) {
 334                 dev_err(&data->client->dev, "Error writing reg_int_en0\n");
 335                 return ret;
 336         }
 337
 338         return 0;
 339 }
 340
 341 static int bmg160_setup_new_data_interrupt(struct bmg160_data *data,
 342                                            bool status)
 343 {
 344         int ret;
 345
 346         /* Enable/Disable INT_MAP1 mapping */
 347         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_1);
 348         if (ret < 0) {
 349                 dev_err(&data->client->dev, "Error reading reg_int_map1\n");
 350                 return ret;
 351         }
 352
 353         if (status)
 354                 ret |= BMG160_INT_MAP_1_BIT_NEW_DATA;
 355         else
 356                 ret &= ~BMG160_INT_MAP_1_BIT_NEW_DATA;
 357
 358         ret = i2c_smbus_write_byte_data(data->client,
 359                                         BMG160_REG_INT_MAP_1,
 360                                         ret);
 361         if (ret < 0) {
 362                 dev_err(&data->client->dev, "Error writing reg_int_map1\n");
 363                 return ret;
 364         }
 365
 366         if (status) {
 367                 ret = i2c_smbus_write_byte_data(data->client,
 368                                                 BMG160_REG_INT_RST_LATCH,
 369                                                 BMG160_INT_MODE_NON_LATCH_INT |
 370                                                 BMG160_INT_MODE_LATCH_RESET);
 371                 if (ret < 0) {
 372                         dev_err(&data->client->dev,
 373                                 "Error writing reg_rst_latch\n");
 374                                 return ret;
 375                 }
 376
 377                 ret = i2c_smbus_write_byte_data(data->client,
 378                                                 BMG160_REG_INT_EN_0,
 379                                                 BMG160_DATA_ENABLE_INT);
 380
 381         } else {
 382                 /* Restore interrupt mode */
 383                 ret = i2c_smbus_write_byte_data(data->client,
 384                                                 BMG160_REG_INT_RST_LATCH,
 385                                                 BMG160_INT_MODE_LATCH_INT |
 386                                                 BMG160_INT_MODE_LATCH_RESET);
 387                 if (ret < 0) {
 388                         dev_err(&data->client->dev,
 389                                 "Error writing reg_rst_latch\n");
 390                                 return ret;
 391                 }
 392
 393                 ret = i2c_smbus_write_byte_data(data->client,
 394                                                 BMG160_REG_INT_EN_0,
 395                                                 0);
 396         }
 397
 398         if (ret < 0) {
 399                 dev_err(&data->client->dev, "Error writing reg_int_en0\n");
 400                 return ret;
 401         }
 402
 403         return 0;
 404 }
 405
 406 static int bmg160_get_bw(struct bmg160_data *data, int *val)
 407 {
 408         int i;
 409
 410         for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) {
 411                 if (bmg160_samp_freq_table[i].bw_bits == data->bw_bits) {
 412                         *val = bmg160_samp_freq_table[i].val;
 413                         return IIO_VAL_INT;
 414                 }
 415         }
 416
 417         return -EINVAL;
 418 }
 419
 420 static int bmg160_set_scale(struct bmg160_data *data, int val)
 421 {
 422         int ret, i;
 423
 424         for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) {
 425                 if (bmg160_scale_table[i].scale == val) {
 426                         ret = i2c_smbus_write_byte_data(
 427                                         data->client,
 428                                         BMG160_REG_RANGE,
 429                                         bmg160_scale_table[i].dps_range);
 430                         if (ret < 0) {
 431                                 dev_err(&data->client->dev,
 432                                         "Error writing reg_range\n");
 433                                 return ret;
 434                         }
 435                         data->dps_range = bmg160_scale_table[i].dps_range;
 436                         return 0;
 437                 }
 438         }
 439
 440         return -EINVAL;
 441 }
 442
 443 static int bmg160_get_temp(struct bmg160_data *data, int *val)
 444 {
 445         int ret;
 446
 447         mutex_lock(&data->mutex);
 448         ret = bmg160_set_power_state(data, true);
 449         if (ret < 0) {
 450                 mutex_unlock(&data->mutex);
 451                 return ret;
 452         }
 453
 454         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_TEMP);
 455         if (ret < 0) {
 456                 dev_err(&data->client->dev, "Error reading reg_temp\n");
 457                 bmg160_set_power_state(data, false);
 458                 mutex_unlock(&data->mutex);
 459                 return ret;
 460         }
 461
 462         *val = sign_extend32(ret, 7);
 463         ret = bmg160_set_power_state(data, false);
 464         mutex_unlock(&data->mutex);
 465         if (ret < 0)
 466                 return ret;
 467
 468         return IIO_VAL_INT;
 469 }
 470
 471 static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
 472 {
 473         int ret;
 474
 475         mutex_lock(&data->mutex);
 476         ret = bmg160_set_power_state(data, true);
 477         if (ret < 0) {
 478                 mutex_unlock(&data->mutex);
 479                 return ret;
 480         }
 481
 482         ret = i2c_smbus_read_word_data(data->client, BMG160_AXIS_TO_REG(axis));
 483         if (ret < 0) {
 484                 dev_err(&data->client->dev, "Error reading axis %d\n", axis);
 485                 bmg160_set_power_state(data, false);
 486                 mutex_unlock(&data->mutex);
 487                 return ret;
 488         }
 489
 490         *val = sign_extend32(ret, 15);
 491         ret = bmg160_set_power_state(data, false);
 492         mutex_unlock(&data->mutex);
 493         if (ret < 0)
 494                 return ret;
 495
 496         return IIO_VAL_INT;
 497 }
 498
 499 static int bmg160_read_raw(struct iio_dev *indio_dev,
 500                            struct iio_chan_spec const *chan,
 501                            int *val, int *val2, long mask)
 502 {
 503         struct bmg160_data *data = iio_priv(indio_dev);
 504         int ret;
 505
 506         switch (mask) {
 507         case IIO_CHAN_INFO_RAW:
 508                 switch (chan->type) {
 509                 case IIO_TEMP:
 510                         return bmg160_get_temp(data, val);
 511                 case IIO_ANGL_VEL:
 512                         if (iio_buffer_enabled(indio_dev))
 513                                 return -EBUSY;
 514                         else
 515                                 return bmg160_get_axis(data, chan->scan_index,
 516                                                        val);
 517                 default:
 518                         return -EINVAL;
 519                 }
 520         case IIO_CHAN_INFO_OFFSET:
 521                 if (chan->type == IIO_TEMP) {
 522                         *val = BMG160_TEMP_CENTER_VAL;
 523                         return IIO_VAL_INT;
 524                 } else
 525                         return -EINVAL;
 526         case IIO_CHAN_INFO_SCALE:
 527                 *val = 0;
 528                 switch (chan->type) {
 529                 case IIO_TEMP:
 530                         *val2 = 500000;
 531                         return IIO_VAL_INT_PLUS_MICRO;
 532                 case IIO_ANGL_VEL:
 533                 {
 534                         int i;
 535
 536                         for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) {
 537                                 if (bmg160_scale_table[i].dps_range ==
 538                                                         data->dps_range) {
 539                                         *val2 = bmg160_scale_table[i].scale;
 540                                         return IIO_VAL_INT_PLUS_MICRO;
 541                                 }
 542                         }
 543                         return -EINVAL;
 544                 }
 545                 default:
 546                         return -EINVAL;
 547                 }
 548         case IIO_CHAN_INFO_SAMP_FREQ:
 549                 *val2 = 0;
 550                 mutex_lock(&data->mutex);
 551                 ret = bmg160_get_bw(data, val);
 552                 mutex_unlock(&data->mutex);
 553                 return ret;
 554         default:
 555                 return -EINVAL;
 556         }
 557 }
 558
 559 static int bmg160_write_raw(struct iio_dev *indio_dev,
 560                             struct iio_chan_spec const *chan,
 561                             int val, int val2, long mask)
 562 {
 563         struct bmg160_data *data = iio_priv(indio_dev);
 564         int ret;
 565
 566         switch (mask) {
 567         case IIO_CHAN_INFO_SAMP_FREQ:
 568                 mutex_lock(&data->mutex);
 569                 /*
 570                  * Section 4.2 of spec
 571                  * In suspend mode, the only supported operations are reading
 572                  * registers as well as writing to the (0x14) softreset
 573                  * register. Since we will be in suspend mode by default, change
 574                  * mode to power on for other writes.
 575                  */
 576                 ret = bmg160_set_power_state(data, true);
 577                 if (ret < 0) {
 578                         mutex_unlock(&data->mutex);
 579                         return ret;
 580                 }
 581                 ret = bmg160_set_bw(data, val);
 582                 if (ret < 0) {
 583                         bmg160_set_power_state(data, false);
 584                         mutex_unlock(&data->mutex);
 585                         return ret;
 586                 }
 587                 ret = bmg160_set_power_state(data, false);
 588                 mutex_unlock(&data->mutex);
 589                 return ret;
 590         case IIO_CHAN_INFO_SCALE:
 591                 if (val)
 592                         return -EINVAL;
 593
 594                 mutex_lock(&data->mutex);
 595                 /* Refer to comments above for the suspend mode ops */
 596                 ret = bmg160_set_power_state(data, true);
 597                 if (ret < 0) {
 598                         mutex_unlock(&data->mutex);
 599                         return ret;
 600                 }
 601                 ret = bmg160_set_scale(data, val2);
 602                 if (ret < 0) {
 603                         bmg160_set_power_state(data, false);
 604                         mutex_unlock(&data->mutex);
 605                         return ret;
 606                 }
 607                 ret = bmg160_set_power_state(data, false);
 608                 mutex_unlock(&data->mutex);
 609                 return ret;
 610         default:
 611                 return -EINVAL;
 612         }
 613
 614         return -EINVAL;
 615 }
 616
 617 static int bmg160_read_event(struct iio_dev *indio_dev,
 618                              const struct iio_chan_spec *chan,
 619                              enum iio_event_type type,
 620                              enum iio_event_direction dir,
 621                              enum iio_event_info info,
 622                              int *val, int *val2)
 623 {
 624         struct bmg160_data *data = iio_priv(indio_dev);
 625
 626         *val2 = 0;
 627         switch (info) {
 628         case IIO_EV_INFO_VALUE:
 629                 *val = data->slope_thres & BMG160_SLOPE_THRES_MASK;
 630                 break;
 631         default:
 632                 return -EINVAL;
 633         }
 634
 635         return IIO_VAL_INT;
 636 }
 637
 638 static int bmg160_write_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         switch (info) {
 648         case IIO_EV_INFO_VALUE:
 649                 if (data->ev_enable_state)
 650                         return -EBUSY;
 651                 data->slope_thres &= ~BMG160_SLOPE_THRES_MASK;
 652                 data->slope_thres |= (val & BMG160_SLOPE_THRES_MASK);
 653                 break;
 654         default:
 655                 return -EINVAL;
 656         }
 657
 658         return 0;
 659 }
 660
 661 static int bmg160_read_event_config(struct iio_dev *indio_dev,
 662                                     const struct iio_chan_spec *chan,
 663                                     enum iio_event_type type,
 664                                     enum iio_event_direction dir)
 665 {
 666
 667         struct bmg160_data *data = iio_priv(indio_dev);
 668
 669         return data->ev_enable_state;
 670 }
 671
 672 static int bmg160_write_event_config(struct iio_dev *indio_dev,
 673                                      const struct iio_chan_spec *chan,
 674                                      enum iio_event_type type,
 675                                      enum iio_event_direction dir,
 676                                      int state)
 677 {
 678         struct bmg160_data *data = iio_priv(indio_dev);
 679         int ret;
 680
 681         if (state && data->ev_enable_state)
 682                 return 0;
 683
 684         mutex_lock(&data->mutex);
 685
 686         if (!state && data->motion_trigger_on) {
 687                 data->ev_enable_state = 0;
 688                 mutex_unlock(&data->mutex);
 689                 return 0;
 690         }
 691         /*
 692          * We will expect the enable and disable to do operation in
 693          * in reverse order. This will happen here anyway as our
 694          * resume operation uses sync mode runtime pm calls, the
 695          * suspend operation will be delayed by autosuspend delay
 696          * So the disable operation will still happen in reverse of
 697          * enable operation. When runtime pm is disabled the mode
 698          * is always on so sequence doesn't matter
 699          */
 700         ret = bmg160_set_power_state(data, state);
 701         if (ret < 0) {
 702                 mutex_unlock(&data->mutex);
 703                 return ret;
 704         }
 705
 706         ret =  bmg160_setup_any_motion_interrupt(data, state);
 707         if (ret < 0) {
 708                 mutex_unlock(&data->mutex);
 709                 return ret;
 710         }
 711
 712         data->ev_enable_state = state;
 713         mutex_unlock(&data->mutex);
 714
 715         return 0;
 716 }
 717
 718 static int bmg160_validate_trigger(struct iio_dev *indio_dev,
 719                                    struct iio_trigger *trig)
 720 {
 721         struct bmg160_data *data = iio_priv(indio_dev);
 722
 723         if (data->dready_trig != trig && data->motion_trig != trig)
 724                 return -EINVAL;
 725
 726         return 0;
 727 }
 728
 729 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("100 200 400 1000 2000");
 730
 731 static IIO_CONST_ATTR(in_anglvel_scale_available,
 732                       "0.001065 0.000532 0.000266 0.000133 0.000066");
 733
 734 static struct attribute *bmg160_attributes[] = {
 735         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 736         &iio_const_attr_in_anglvel_scale_available.dev_attr.attr,
 737         NULL,
 738 };
 739
 740 static const struct attribute_group bmg160_attrs_group = {
 741         .attrs = bmg160_attributes,
 742 };
 743
 744 static const struct iio_event_spec bmg160_event = {
 745                 .type = IIO_EV_TYPE_ROC,
 746                 .dir = IIO_EV_DIR_RISING | IIO_EV_DIR_FALLING,
 747                 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
 748                                        BIT(IIO_EV_INFO_ENABLE)
 749 };
 750
 751 #define BMG160_CHANNEL(_axis) {                                 \
 752         .type = IIO_ANGL_VEL,                                           \
 753         .modified = 1,                                                  \
 754         .channel2 = IIO_MOD_##_axis,                                    \
 755         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
 756         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
 757                                     BIT(IIO_CHAN_INFO_SAMP_FREQ),       \
 758         .scan_index = AXIS_##_axis,                                     \
 759         .scan_type = {                                                  \
 760                 .sign = 's',                                            \
 761                 .realbits = 16,                                 \
 762                 .storagebits = 16,                                      \
 763         },                                                              \
 764         .event_spec = &bmg160_event,                                    \
 765         .num_event_specs = 1                                            \
 766 }
 767
 768 static const struct iio_chan_spec bmg160_channels[] = {
 769         {
 770                 .type = IIO_TEMP,
 771                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 772                                       BIT(IIO_CHAN_INFO_SCALE) |
 773                                       BIT(IIO_CHAN_INFO_OFFSET),
 774                 .scan_index = -1,
 775         },
 776         BMG160_CHANNEL(X),
 777         BMG160_CHANNEL(Y),
 778         BMG160_CHANNEL(Z),
 779         IIO_CHAN_SOFT_TIMESTAMP(3),
 780 };
 781
 782 static const struct iio_info bmg160_info = {
 783         .attrs                  = &bmg160_attrs_group,
 784         .read_raw               = bmg160_read_raw,
 785         .write_raw              = bmg160_write_raw,
 786         .read_event_value       = bmg160_read_event,
 787         .write_event_value      = bmg160_write_event,
 788         .write_event_config     = bmg160_write_event_config,
 789         .read_event_config      = bmg160_read_event_config,
 790         .validate_trigger       = bmg160_validate_trigger,
 791         .driver_module          = THIS_MODULE,
 792 };
 793
 794 static irqreturn_t bmg160_trigger_handler(int irq, void *p)
 795 {
 796         struct iio_poll_func *pf = p;
 797         struct iio_dev *indio_dev = pf->indio_dev;
 798         struct bmg160_data *data = iio_priv(indio_dev);
 799         int bit, ret, i = 0;
 800
 801         mutex_lock(&data->mutex);
 802         for_each_set_bit(bit, indio_dev->buffer->scan_mask,
 803                          indio_dev->masklength) {
 804                 ret = i2c_smbus_read_word_data(data->client,
 805                                                BMG160_AXIS_TO_REG(bit));
 806                 if (ret < 0) {
 807                         mutex_unlock(&data->mutex);
 808                         goto err;
 809                 }
 810                 data->buffer[i++] = ret;
 811         }
 812         mutex_unlock(&data->mutex);
 813
 814         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 815                                            data->timestamp);
 816 err:
 817         iio_trigger_notify_done(indio_dev->trig);
 818
 819         return IRQ_HANDLED;
 820 }
 821
 822 static int bmg160_trig_try_reen(struct iio_trigger *trig)
 823 {
 824         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 825         struct bmg160_data *data = iio_priv(indio_dev);
 826         int ret;
 827
 828         /* new data interrupts don't need ack */
 829         if (data->dready_trigger_on)
 830                 return 0;
 831
 832         /* Set latched mode interrupt and clear any latched interrupt */
 833         ret = i2c_smbus_write_byte_data(data->client,
 834                                         BMG160_REG_INT_RST_LATCH,
 835                                         BMG160_INT_MODE_LATCH_INT |
 836                                         BMG160_INT_MODE_LATCH_RESET);
 837         if (ret < 0) {
 838                 dev_err(&data->client->dev, "Error writing reg_rst_latch\n");
 839                 return ret;
 840         }
 841
 842         return 0;
 843 }
 844
 845 static int bmg160_data_rdy_trigger_set_state(struct iio_trigger *trig,
 846                                              bool state)
 847 {
 848         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 849         struct bmg160_data *data = iio_priv(indio_dev);
 850         int ret;
 851
 852         mutex_lock(&data->mutex);
 853
 854         if (!state && data->ev_enable_state && data->motion_trigger_on) {
 855                 data->motion_trigger_on = false;
 856                 mutex_unlock(&data->mutex);
 857                 return 0;
 858         }
 859
 860         /*
 861          * Refer to comment in bmg160_write_event_config for
 862          * enable/disable operation order
 863          */
 864         ret = bmg160_set_power_state(data, state);
 865         if (ret < 0) {
 866                 mutex_unlock(&data->mutex);
 867                 return ret;
 868         }
 869         if (data->motion_trig == trig)
 870                 ret =  bmg160_setup_any_motion_interrupt(data, state);
 871         else
 872                 ret = bmg160_setup_new_data_interrupt(data, state);
 873         if (ret < 0) {
 874                 mutex_unlock(&data->mutex);
 875                 return ret;
 876         }
 877         if (data->motion_trig == trig)
 878                 data->motion_trigger_on = state;
 879         else
 880                 data->dready_trigger_on = state;
 881
 882         mutex_unlock(&data->mutex);
 883
 884         return 0;
 885 }
 886
 887 static const struct iio_trigger_ops bmg160_trigger_ops = {
 888         .set_trigger_state = bmg160_data_rdy_trigger_set_state,
 889         .try_reenable = bmg160_trig_try_reen,
 890         .owner = THIS_MODULE,
 891 };
 892
 893 static irqreturn_t bmg160_event_handler(int irq, void *private)
 894 {
 895         struct iio_dev *indio_dev = private;
 896         struct bmg160_data *data = iio_priv(indio_dev);
 897         int ret;
 898         int dir;
 899
 900         ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_STATUS_2);
 901         if (ret < 0) {
 902                 dev_err(&data->client->dev, "Error reading reg_int_status2\n");
 903                 goto ack_intr_status;
 904         }
 905
 906         if (ret & 0x08)
 907                 dir = IIO_EV_DIR_RISING;
 908         else
 909                 dir = IIO_EV_DIR_FALLING;
 910
 911         if (ret & BMG160_ANY_MOTION_MASK)
 912                 iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
 913                                                         0,
 914                                                         IIO_MOD_X_OR_Y_OR_Z,
 915                                                         IIO_EV_TYPE_ROC,
 916                                                         dir),
 917                                                         data->timestamp);
 918
 919 ack_intr_status:
 920         if (!data->dready_trigger_on) {
 921                 ret = i2c_smbus_write_byte_data(data->client,
 922                                         BMG160_REG_INT_RST_LATCH,
 923                                         BMG160_INT_MODE_LATCH_INT |
 924                                         BMG160_INT_MODE_LATCH_RESET);
 925                 if (ret < 0)
 926                         dev_err(&data->client->dev,
 927                                 "Error writing reg_rst_latch\n");
 928         }
 929
 930         return IRQ_HANDLED;
 931 }
 932
 933 static irqreturn_t bmg160_data_rdy_trig_poll(int irq, void *private)
 934 {
 935         struct iio_dev *indio_dev = private;
 936         struct bmg160_data *data = iio_priv(indio_dev);
 937
 938         data->timestamp = iio_get_time_ns();
 939
 940         if (data->dready_trigger_on)
 941                 iio_trigger_poll(data->dready_trig);
 942         else if (data->motion_trigger_on)
 943                 iio_trigger_poll(data->motion_trig);
 944
 945         if (data->ev_enable_state)
 946                 return IRQ_WAKE_THREAD;
 947         else
 948                 return IRQ_HANDLED;
 949
 950 }
 951
 952 static int bmg160_acpi_gpio_probe(struct i2c_client *client,
 953                                   struct bmg160_data *data)
 954 {
 955         const struct acpi_device_id *id;
 956         struct device *dev;
 957         struct gpio_desc *gpio;
 958         int ret;
 959
 960         if (!client)
 961                 return -EINVAL;
 962
 963         dev = &client->dev;
 964         if (!ACPI_HANDLE(dev))
 965                 return -ENODEV;
 966
 967         id = acpi_match_device(dev->driver->acpi_match_table, dev);
 968         if (!id)
 969                 return -ENODEV;
 970
 971         /* data ready gpio interrupt pin */
 972         gpio = devm_gpiod_get_index(dev, BMG160_GPIO_NAME, 0);
 973         if (IS_ERR(gpio)) {
 974                 dev_err(dev, "acpi gpio get index failed\n");
 975                 return PTR_ERR(gpio);
 976         }
 977
 978         ret = gpiod_direction_input(gpio);
 979         if (ret)
 980                 return ret;
 981
 982         ret = gpiod_to_irq(gpio);
 983
 984         dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
 985
 986         return ret;
 987 }
 988
 989 static int bmg160_probe(struct i2c_client *client,
 990                         const struct i2c_device_id *id)
 991 {
 992         struct bmg160_data *data;
 993         struct iio_dev *indio_dev;
 994         int ret;
 995
 996         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 997         if (!indio_dev)
 998                 return -ENOMEM;
 999
1000         data = iio_priv(indio_dev);
1001         i2c_set_clientdata(client, indio_dev);
1002         data->client = client;
1003
1004         ret = bmg160_chip_init(data);
1005         if (ret < 0)
1006                 return ret;
1007
1008         mutex_init(&data->mutex);
1009
1010         indio_dev->dev.parent = &client->dev;
1011         indio_dev->channels = bmg160_channels;
1012         indio_dev->num_channels = ARRAY_SIZE(bmg160_channels);
1013         indio_dev->name = BMG160_DRV_NAME;
1014         indio_dev->modes = INDIO_DIRECT_MODE;
1015         indio_dev->info = &bmg160_info;
1016
1017         if (client->irq <= 0)
1018                 client->irq = bmg160_acpi_gpio_probe(client, data);
1019
1020         if (client->irq > 0) {
1021                 ret = devm_request_threaded_irq(&client->dev,
1022                                                 client->irq,
1023                                                 bmg160_data_rdy_trig_poll,
1024                                                 bmg160_event_handler,
1025                                                 IRQF_TRIGGER_RISING,
1026                                                 BMG160_IRQ_NAME,
1027                                                 indio_dev);
1028                 if (ret)
1029                         return ret;
1030
1031                 data->dready_trig = devm_iio_trigger_alloc(&client->dev,
1032                                                            "%s-dev%d",
1033                                                            indio_dev->name,
1034                                                            indio_dev->id);
1035                 if (!data->dready_trig)
1036                         return -ENOMEM;
1037
1038                 data->motion_trig = devm_iio_trigger_alloc(&client->dev,
1039                                                           "%s-any-motion-dev%d",
1040                                                           indio_dev->name,
1041                                                           indio_dev->id);
1042                 if (!data->motion_trig)
1043                         return -ENOMEM;
1044
1045                 data->dready_trig->dev.parent = &client->dev;
1046                 data->dready_trig->ops = &bmg160_trigger_ops;
1047                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
1048                 ret = iio_trigger_register(data->dready_trig);
1049                 if (ret)
1050                         return ret;
1051
1052                 data->motion_trig->dev.parent = &client->dev;
1053                 data->motion_trig->ops = &bmg160_trigger_ops;
1054                 iio_trigger_set_drvdata(data->motion_trig, indio_dev);
1055                 ret = iio_trigger_register(data->motion_trig);
1056                 if (ret) {
1057                         data->motion_trig = NULL;
1058                         goto err_trigger_unregister;
1059                 }
1060
1061                 ret = iio_triggered_buffer_setup(indio_dev,
1062                                                  NULL,
1063                                                  bmg160_trigger_handler,
1064                                                  NULL);
1065                 if (ret < 0) {
1066                         dev_err(&client->dev,
1067                                 "iio triggered buffer setup failed\n");
1068                         goto err_trigger_unregister;
1069                 }
1070         }
1071
1072         ret = iio_device_register(indio_dev);
1073         if (ret < 0) {
1074                 dev_err(&client->dev, "unable to register iio device\n");
1075                 goto err_buffer_cleanup;
1076         }
1077
1078         ret = pm_runtime_set_active(&client->dev);
1079         if (ret)
1080                 goto err_iio_unregister;
1081
1082         pm_runtime_enable(&client->dev);
1083         pm_runtime_set_autosuspend_delay(&client->dev,
1084                                          BMG160_AUTO_SUSPEND_DELAY_MS);
1085         pm_runtime_use_autosuspend(&client->dev);
1086
1087         return 0;
1088
1089 err_iio_unregister:
1090         iio_device_unregister(indio_dev);
1091 err_buffer_cleanup:
1092         if (data->dready_trig)
1093                 iio_triggered_buffer_cleanup(indio_dev);
1094 err_trigger_unregister:
1095         if (data->dready_trig)
1096                 iio_trigger_unregister(data->dready_trig);
1097         if (data->motion_trig)
1098                 iio_trigger_unregister(data->motion_trig);
1099
1100         return ret;
1101 }
1102
1103 static int bmg160_remove(struct i2c_client *client)
1104 {
1105         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1106         struct bmg160_data *data = iio_priv(indio_dev);
1107
1108         pm_runtime_disable(&client->dev);
1109         pm_runtime_set_suspended(&client->dev);
1110         pm_runtime_put_noidle(&client->dev);
1111
1112         iio_device_unregister(indio_dev);
1113
1114         if (data->dready_trig) {
1115                 iio_triggered_buffer_cleanup(indio_dev);
1116                 iio_trigger_unregister(data->dready_trig);
1117                 iio_trigger_unregister(data->motion_trig);
1118         }
1119
1120         mutex_lock(&data->mutex);
1121         bmg160_set_mode(data, BMG160_MODE_DEEP_SUSPEND);
1122         mutex_unlock(&data->mutex);
1123
1124         return 0;
1125 }
1126
1127 #ifdef CONFIG_PM_SLEEP
1128 static int bmg160_suspend(struct device *dev)
1129 {
1130         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1131         struct bmg160_data *data = iio_priv(indio_dev);
1132
1133         mutex_lock(&data->mutex);
1134         bmg160_set_mode(data, BMG160_MODE_SUSPEND);
1135         mutex_unlock(&data->mutex);
1136
1137         return 0;
1138 }
1139
1140 static int bmg160_resume(struct device *dev)
1141 {
1142         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1143         struct bmg160_data *data = iio_priv(indio_dev);
1144
1145         mutex_lock(&data->mutex);
1146         if (data->dready_trigger_on || data->motion_trigger_on ||
1147                                                         data->ev_enable_state)
1148                 bmg160_set_mode(data, BMG160_MODE_NORMAL);
1149         mutex_unlock(&data->mutex);
1150
1151         return 0;
1152 }
1153 #endif
1154
1155 #ifdef CONFIG_PM_RUNTIME
1156 static int bmg160_runtime_suspend(struct device *dev)
1157 {
1158         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1159         struct bmg160_data *data = iio_priv(indio_dev);
1160
1161         return bmg160_set_mode(data, BMG160_MODE_SUSPEND);
1162 }
1163
1164 static int bmg160_runtime_resume(struct device *dev)
1165 {
1166         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1167         struct bmg160_data *data = iio_priv(indio_dev);
1168         int ret;
1169
1170         ret = bmg160_set_mode(data, BMG160_MODE_NORMAL);
1171         if (ret < 0)
1172                 return ret;
1173
1174         msleep_interruptible(BMG160_MAX_STARTUP_TIME_MS);
1175
1176         return 0;
1177 }
1178 #endif
1179
1180 static const struct dev_pm_ops bmg160_pm_ops = {
1181         SET_SYSTEM_SLEEP_PM_OPS(bmg160_suspend, bmg160_resume)
1182         SET_RUNTIME_PM_OPS(bmg160_runtime_suspend,
1183                            bmg160_runtime_resume, NULL)
1184 };
1185
1186 static const struct acpi_device_id bmg160_acpi_match[] = {
1187         {"BMG0160", 0},
1188         { },
1189 };
1190 MODULE_DEVICE_TABLE(acpi, bmg160_acpi_match);
1191
1192 static const struct i2c_device_id bmg160_id[] = {
1193         {"bmg160", 0},
1194         {}
1195 };
1196
1197 MODULE_DEVICE_TABLE(i2c, bmg160_id);
1198
1199 static struct i2c_driver bmg160_driver = {
1200         .driver = {
1201                 .name   = BMG160_DRV_NAME,
1202                 .acpi_match_table = ACPI_PTR(bmg160_acpi_match),
1203                 .pm     = &bmg160_pm_ops,
1204         },
1205         .probe          = bmg160_probe,
1206         .remove         = bmg160_remove,
1207         .id_table       = bmg160_id,
1208 };
1209 module_i2c_driver(bmg160_driver);
1210
1211 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
1212 MODULE_LICENSE("GPL v2");
1213 MODULE_DESCRIPTION("BMG160 Gyro driver");