drivers/iio/magnetometer/bmc150_magn.c

   1 /*
   2  * Bosch BMC150 three-axis magnetic field sensor driver
   3  *
   4  * Copyright (c) 2015, Intel Corporation.
   5  *
   6  * This code is based on bmm050_api.c authored by contact@bosch.sensortec.com:
   7  *
   8  * (C) Copyright 2011~2014 Bosch Sensortec GmbH All Rights Reserved
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms and conditions of the GNU General Public License,
  12  * version 2, as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/i2c.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/delay.h>
  24 #include <linux/slab.h>
  25 #include <linux/acpi.h>
  26 #include <linux/pm.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/iio/iio.h>
  29 #include <linux/iio/sysfs.h>
  30 #include <linux/iio/buffer.h>
  31 #include <linux/iio/events.h>
  32 #include <linux/iio/trigger.h>
  33 #include <linux/iio/trigger_consumer.h>
  34 #include <linux/iio/triggered_buffer.h>
  35 #include <linux/regmap.h>
  36
  37 #include "bmc150_magn.h"
  38
  39 #define BMC150_MAGN_DRV_NAME                    "bmc150_magn"
  40 #define BMC150_MAGN_IRQ_NAME                    "bmc150_magn_event"
  41
  42 #define BMC150_MAGN_REG_CHIP_ID                 0x40
  43 #define BMC150_MAGN_CHIP_ID_VAL                 0x32
  44
  45 #define BMC150_MAGN_REG_X_L                     0x42
  46 #define BMC150_MAGN_REG_X_M                     0x43
  47 #define BMC150_MAGN_REG_Y_L                     0x44
  48 #define BMC150_MAGN_REG_Y_M                     0x45
  49 #define BMC150_MAGN_SHIFT_XY_L                  3
  50 #define BMC150_MAGN_REG_Z_L                     0x46
  51 #define BMC150_MAGN_REG_Z_M                     0x47
  52 #define BMC150_MAGN_SHIFT_Z_L                   1
  53 #define BMC150_MAGN_REG_RHALL_L                 0x48
  54 #define BMC150_MAGN_REG_RHALL_M                 0x49
  55 #define BMC150_MAGN_SHIFT_RHALL_L               2
  56
  57 #define BMC150_MAGN_REG_INT_STATUS              0x4A
  58
  59 #define BMC150_MAGN_REG_POWER                   0x4B
  60 #define BMC150_MAGN_MASK_POWER_CTL              BIT(0)
  61
  62 #define BMC150_MAGN_REG_OPMODE_ODR              0x4C
  63 #define BMC150_MAGN_MASK_OPMODE                 GENMASK(2, 1)
  64 #define BMC150_MAGN_SHIFT_OPMODE                1
  65 #define BMC150_MAGN_MODE_NORMAL                 0x00
  66 #define BMC150_MAGN_MODE_FORCED                 0x01
  67 #define BMC150_MAGN_MODE_SLEEP                  0x03
  68 #define BMC150_MAGN_MASK_ODR                    GENMASK(5, 3)
  69 #define BMC150_MAGN_SHIFT_ODR                   3
  70
  71 #define BMC150_MAGN_REG_INT                     0x4D
  72
  73 #define BMC150_MAGN_REG_INT_DRDY                0x4E
  74 #define BMC150_MAGN_MASK_DRDY_EN                BIT(7)
  75 #define BMC150_MAGN_SHIFT_DRDY_EN               7
  76 #define BMC150_MAGN_MASK_DRDY_INT3              BIT(6)
  77 #define BMC150_MAGN_MASK_DRDY_Z_EN              BIT(5)
  78 #define BMC150_MAGN_MASK_DRDY_Y_EN              BIT(4)
  79 #define BMC150_MAGN_MASK_DRDY_X_EN              BIT(3)
  80 #define BMC150_MAGN_MASK_DRDY_DR_POLARITY       BIT(2)
  81 #define BMC150_MAGN_MASK_DRDY_LATCHING          BIT(1)
  82 #define BMC150_MAGN_MASK_DRDY_INT3_POLARITY     BIT(0)
  83
  84 #define BMC150_MAGN_REG_LOW_THRESH              0x4F
  85 #define BMC150_MAGN_REG_HIGH_THRESH             0x50
  86 #define BMC150_MAGN_REG_REP_XY                  0x51
  87 #define BMC150_MAGN_REG_REP_Z                   0x52
  88 #define BMC150_MAGN_REG_REP_DATAMASK            GENMASK(7, 0)
  89
  90 #define BMC150_MAGN_REG_TRIM_START              0x5D
  91 #define BMC150_MAGN_REG_TRIM_END                0x71
  92
  93 #define BMC150_MAGN_XY_OVERFLOW_VAL             -4096
  94 #define BMC150_MAGN_Z_OVERFLOW_VAL              -16384
  95
  96 /* Time from SUSPEND to SLEEP */
  97 #define BMC150_MAGN_START_UP_TIME_MS            3
  98
  99 #define BMC150_MAGN_AUTO_SUSPEND_DELAY_MS       2000
 100
 101 #define BMC150_MAGN_REGVAL_TO_REPXY(regval) (((regval) * 2) + 1)
 102 #define BMC150_MAGN_REGVAL_TO_REPZ(regval) ((regval) + 1)
 103 #define BMC150_MAGN_REPXY_TO_REGVAL(rep) (((rep) - 1) / 2)
 104 #define BMC150_MAGN_REPZ_TO_REGVAL(rep) ((rep) - 1)
 105
 106 enum bmc150_magn_axis {
 107         AXIS_X,
 108         AXIS_Y,
 109         AXIS_Z,
 110         RHALL,
 111         AXIS_XYZ_MAX = RHALL,
 112         AXIS_XYZR_MAX,
 113 };
 114
 115 enum bmc150_magn_power_modes {
 116         BMC150_MAGN_POWER_MODE_SUSPEND,
 117         BMC150_MAGN_POWER_MODE_SLEEP,
 118         BMC150_MAGN_POWER_MODE_NORMAL,
 119 };
 120
 121 struct bmc150_magn_trim_regs {
 122         s8 x1;
 123         s8 y1;
 124         __le16 reserved1;
 125         u8 reserved2;
 126         __le16 z4;
 127         s8 x2;
 128         s8 y2;
 129         __le16 reserved3;
 130         __le16 z2;
 131         __le16 z1;
 132         __le16 xyz1;
 133         __le16 z3;
 134         s8 xy2;
 135         u8 xy1;
 136 } __packed;
 137
 138 struct bmc150_magn_data {
 139         struct device *dev;
 140         /*
 141          * 1. Protect this structure.
 142          * 2. Serialize sequences that power on/off the device and access HW.
 143          */
 144         struct mutex mutex;
 145         struct regmap *regmap;
 146         /* 4 x 32 bits for x, y z, 4 bytes align, 64 bits timestamp */
 147         s32 buffer[6];
 148         struct iio_trigger *dready_trig;
 149         bool dready_trigger_on;
 150         int max_odr;
 151         int irq;
 152 };
 153
 154 static const struct {
 155         int freq;
 156         u8 reg_val;
 157 } bmc150_magn_samp_freq_table[] = { {2, 0x01},
 158                                     {6, 0x02},
 159                                     {8, 0x03},
 160                                     {10, 0x00},
 161                                     {15, 0x04},
 162                                     {20, 0x05},
 163                                     {25, 0x06},
 164                                     {30, 0x07} };
 165
 166 enum bmc150_magn_presets {
 167         LOW_POWER_PRESET,
 168         REGULAR_PRESET,
 169         ENHANCED_REGULAR_PRESET,
 170         HIGH_ACCURACY_PRESET
 171 };
 172
 173 static const struct bmc150_magn_preset {
 174         u8 rep_xy;
 175         u8 rep_z;
 176         u8 odr;
 177 } bmc150_magn_presets_table[] = {
 178         [LOW_POWER_PRESET] = {3, 3, 10},
 179         [REGULAR_PRESET] =  {9, 15, 10},
 180         [ENHANCED_REGULAR_PRESET] =  {15, 27, 10},
 181         [HIGH_ACCURACY_PRESET] =  {47, 83, 20},
 182 };
 183
 184 #define BMC150_MAGN_DEFAULT_PRESET REGULAR_PRESET
 185
 186 static bool bmc150_magn_is_writeable_reg(struct device *dev, unsigned int reg)
 187 {
 188         switch (reg) {
 189         case BMC150_MAGN_REG_POWER:
 190         case BMC150_MAGN_REG_OPMODE_ODR:
 191         case BMC150_MAGN_REG_INT:
 192         case BMC150_MAGN_REG_INT_DRDY:
 193         case BMC150_MAGN_REG_LOW_THRESH:
 194         case BMC150_MAGN_REG_HIGH_THRESH:
 195         case BMC150_MAGN_REG_REP_XY:
 196         case BMC150_MAGN_REG_REP_Z:
 197                 return true;
 198         default:
 199                 return false;
 200         };
 201 }
 202
 203 static bool bmc150_magn_is_volatile_reg(struct device *dev, unsigned int reg)
 204 {
 205         switch (reg) {
 206         case BMC150_MAGN_REG_X_L:
 207         case BMC150_MAGN_REG_X_M:
 208         case BMC150_MAGN_REG_Y_L:
 209         case BMC150_MAGN_REG_Y_M:
 210         case BMC150_MAGN_REG_Z_L:
 211         case BMC150_MAGN_REG_Z_M:
 212         case BMC150_MAGN_REG_RHALL_L:
 213         case BMC150_MAGN_REG_RHALL_M:
 214         case BMC150_MAGN_REG_INT_STATUS:
 215                 return true;
 216         default:
 217                 return false;
 218         }
 219 }
 220
 221 const struct regmap_config bmc150_magn_regmap_config = {
 222         .reg_bits = 8,
 223         .val_bits = 8,
 224
 225         .max_register = BMC150_MAGN_REG_TRIM_END,
 226         .cache_type = REGCACHE_RBTREE,
 227
 228         .writeable_reg = bmc150_magn_is_writeable_reg,
 229         .volatile_reg = bmc150_magn_is_volatile_reg,
 230 };
 231 EXPORT_SYMBOL(bmc150_magn_regmap_config);
 232
 233 static int bmc150_magn_set_power_mode(struct bmc150_magn_data *data,
 234                                       enum bmc150_magn_power_modes mode,
 235                                       bool state)
 236 {
 237         int ret;
 238
 239         switch (mode) {
 240         case BMC150_MAGN_POWER_MODE_SUSPEND:
 241                 ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_POWER,
 242                                          BMC150_MAGN_MASK_POWER_CTL, !state);
 243                 if (ret < 0)
 244                         return ret;
 245                 usleep_range(BMC150_MAGN_START_UP_TIME_MS * 1000, 20000);
 246                 return 0;
 247         case BMC150_MAGN_POWER_MODE_SLEEP:
 248                 return regmap_update_bits(data->regmap,
 249                                           BMC150_MAGN_REG_OPMODE_ODR,
 250                                           BMC150_MAGN_MASK_OPMODE,
 251                                           BMC150_MAGN_MODE_SLEEP <<
 252                                           BMC150_MAGN_SHIFT_OPMODE);
 253         case BMC150_MAGN_POWER_MODE_NORMAL:
 254                 return regmap_update_bits(data->regmap,
 255                                           BMC150_MAGN_REG_OPMODE_ODR,
 256                                           BMC150_MAGN_MASK_OPMODE,
 257                                           BMC150_MAGN_MODE_NORMAL <<
 258                                           BMC150_MAGN_SHIFT_OPMODE);
 259         }
 260
 261         return -EINVAL;
 262 }
 263
 264 static int bmc150_magn_set_power_state(struct bmc150_magn_data *data, bool on)
 265 {
 266 #ifdef CONFIG_PM
 267         int ret;
 268
 269         if (on) {
 270                 ret = pm_runtime_get_sync(data->dev);
 271         } else {
 272                 pm_runtime_mark_last_busy(data->dev);
 273                 ret = pm_runtime_put_autosuspend(data->dev);
 274         }
 275
 276         if (ret < 0) {
 277                 dev_err(data->dev,
 278                         "failed to change power state to %d\n", on);
 279                 if (on)
 280                         pm_runtime_put_noidle(data->dev);
 281
 282                 return ret;
 283         }
 284 #endif
 285
 286         return 0;
 287 }
 288
 289 static int bmc150_magn_get_odr(struct bmc150_magn_data *data, int *val)
 290 {
 291         int ret, reg_val;
 292         u8 i, odr_val;
 293
 294         ret = regmap_read(data->regmap, BMC150_MAGN_REG_OPMODE_ODR, &reg_val);
 295         if (ret < 0)
 296                 return ret;
 297         odr_val = (reg_val & BMC150_MAGN_MASK_ODR) >> BMC150_MAGN_SHIFT_ODR;
 298
 299         for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++)
 300                 if (bmc150_magn_samp_freq_table[i].reg_val == odr_val) {
 301                         *val = bmc150_magn_samp_freq_table[i].freq;
 302                         return 0;
 303                 }
 304
 305         return -EINVAL;
 306 }
 307
 308 static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val)
 309 {
 310         int ret;
 311         u8 i;
 312
 313         for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
 314                 if (bmc150_magn_samp_freq_table[i].freq == val) {
 315                         ret = regmap_update_bits(data->regmap,
 316                                                  BMC150_MAGN_REG_OPMODE_ODR,
 317                                                  BMC150_MAGN_MASK_ODR,
 318                                                  bmc150_magn_samp_freq_table[i].
 319                                                  reg_val <<
 320                                                  BMC150_MAGN_SHIFT_ODR);
 321                         if (ret < 0)
 322                                 return ret;
 323                         return 0;
 324                 }
 325         }
 326
 327         return -EINVAL;
 328 }
 329
 330 static int bmc150_magn_set_max_odr(struct bmc150_magn_data *data, int rep_xy,
 331                                    int rep_z, int odr)
 332 {
 333         int ret, reg_val, max_odr;
 334
 335         if (rep_xy <= 0) {
 336                 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY,
 337                                   &reg_val);
 338                 if (ret < 0)
 339                         return ret;
 340                 rep_xy = BMC150_MAGN_REGVAL_TO_REPXY(reg_val);
 341         }
 342         if (rep_z <= 0) {
 343                 ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z,
 344                                   &reg_val);
 345                 if (ret < 0)
 346                         return ret;
 347                 rep_z = BMC150_MAGN_REGVAL_TO_REPZ(reg_val);
 348         }
 349         if (odr <= 0) {
 350                 ret = bmc150_magn_get_odr(data, &odr);
 351                 if (ret < 0)
 352                         return ret;
 353         }
 354         /* the maximum selectable read-out frequency from datasheet */
 355         max_odr = 1000000 / (145 * rep_xy + 500 * rep_z + 980);
 356         if (odr > max_odr) {
 357                 dev_err(data->dev,
 358                         "Can't set oversampling with sampling freq %d\n",
 359                         odr);
 360                 return -EINVAL;
 361         }
 362         data->max_odr = max_odr;
 363
 364         return 0;
 365 }
 366
 367 static s32 bmc150_magn_compensate_x(struct bmc150_magn_trim_regs *tregs, s16 x,
 368                                     u16 rhall)
 369 {
 370         s16 val;
 371         u16 xyz1 = le16_to_cpu(tregs->xyz1);
 372
 373         if (x == BMC150_MAGN_XY_OVERFLOW_VAL)
 374                 return S32_MIN;
 375
 376         if (!rhall)
 377                 rhall = xyz1;
 378
 379         val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000)));
 380         val = ((s16)((((s32)x) * ((((((((s32)tregs->xy2) * ((((s32)val) *
 381               ((s32)val)) >> 7)) + (((s32)val) *
 382               ((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) *
 383               ((s32)(((s16)tregs->x2) + ((s16)0xA0)))) >> 12)) >> 13)) +
 384               (((s16)tregs->x1) << 3);
 385
 386         return (s32)val;
 387 }
 388
 389 static s32 bmc150_magn_compensate_y(struct bmc150_magn_trim_regs *tregs, s16 y,
 390                                     u16 rhall)
 391 {
 392         s16 val;
 393         u16 xyz1 = le16_to_cpu(tregs->xyz1);
 394
 395         if (y == BMC150_MAGN_XY_OVERFLOW_VAL)
 396                 return S32_MIN;
 397
 398         if (!rhall)
 399                 rhall = xyz1;
 400
 401         val = ((s16)(((u16)((((s32)xyz1) << 14) / rhall)) - ((u16)0x4000)));
 402         val = ((s16)((((s32)y) * ((((((((s32)tregs->xy2) * ((((s32)val) *
 403               ((s32)val)) >> 7)) + (((s32)val) *
 404               ((s32)(((s16)tregs->xy1) << 7)))) >> 9) + ((s32)0x100000)) *
 405               ((s32)(((s16)tregs->y2) + ((s16)0xA0)))) >> 12)) >> 13)) +
 406               (((s16)tregs->y1) << 3);
 407
 408         return (s32)val;
 409 }
 410
 411 static s32 bmc150_magn_compensate_z(struct bmc150_magn_trim_regs *tregs, s16 z,
 412                                     u16 rhall)
 413 {
 414         s32 val;
 415         u16 xyz1 = le16_to_cpu(tregs->xyz1);
 416         u16 z1 = le16_to_cpu(tregs->z1);
 417         s16 z2 = le16_to_cpu(tregs->z2);
 418         s16 z3 = le16_to_cpu(tregs->z3);
 419         s16 z4 = le16_to_cpu(tregs->z4);
 420
 421         if (z == BMC150_MAGN_Z_OVERFLOW_VAL)
 422                 return S32_MIN;
 423
 424         val = (((((s32)(z - z4)) << 15) - ((((s32)z3) * ((s32)(((s16)rhall) -
 425               ((s16)xyz1)))) >> 2)) / (z2 + ((s16)(((((s32)z1) *
 426               ((((s16)rhall) << 1))) + (1 << 15)) >> 16))));
 427
 428         return val;
 429 }
 430
 431 static int bmc150_magn_read_xyz(struct bmc150_magn_data *data, s32 *buffer)
 432 {
 433         int ret;
 434         __le16 values[AXIS_XYZR_MAX];
 435         s16 raw_x, raw_y, raw_z;
 436         u16 rhall;
 437         struct bmc150_magn_trim_regs tregs;
 438
 439         ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_X_L,
 440                                values, sizeof(values));
 441         if (ret < 0)
 442                 return ret;
 443
 444         raw_x = (s16)le16_to_cpu(values[AXIS_X]) >> BMC150_MAGN_SHIFT_XY_L;
 445         raw_y = (s16)le16_to_cpu(values[AXIS_Y]) >> BMC150_MAGN_SHIFT_XY_L;
 446         raw_z = (s16)le16_to_cpu(values[AXIS_Z]) >> BMC150_MAGN_SHIFT_Z_L;
 447         rhall = le16_to_cpu(values[RHALL]) >> BMC150_MAGN_SHIFT_RHALL_L;
 448
 449         ret = regmap_bulk_read(data->regmap, BMC150_MAGN_REG_TRIM_START,
 450                                &tregs, sizeof(tregs));
 451         if (ret < 0)
 452                 return ret;
 453
 454         buffer[AXIS_X] = bmc150_magn_compensate_x(&tregs, raw_x, rhall);
 455         buffer[AXIS_Y] = bmc150_magn_compensate_y(&tregs, raw_y, rhall);
 456         buffer[AXIS_Z] = bmc150_magn_compensate_z(&tregs, raw_z, rhall);
 457
 458         return 0;
 459 }
 460
 461 static int bmc150_magn_read_raw(struct iio_dev *indio_dev,
 462                                 struct iio_chan_spec const *chan,
 463                                 int *val, int *val2, long mask)
 464 {
 465         struct bmc150_magn_data *data = iio_priv(indio_dev);
 466         int ret, tmp;
 467         s32 values[AXIS_XYZ_MAX];
 468
 469         switch (mask) {
 470         case IIO_CHAN_INFO_RAW:
 471                 if (iio_buffer_enabled(indio_dev))
 472                         return -EBUSY;
 473                 mutex_lock(&data->mutex);
 474
 475                 ret = bmc150_magn_set_power_state(data, true);
 476                 if (ret < 0) {
 477                         mutex_unlock(&data->mutex);
 478                         return ret;
 479                 }
 480
 481                 ret = bmc150_magn_read_xyz(data, values);
 482                 if (ret < 0) {
 483                         bmc150_magn_set_power_state(data, false);
 484                         mutex_unlock(&data->mutex);
 485                         return ret;
 486                 }
 487                 *val = values[chan->scan_index];
 488
 489                 ret = bmc150_magn_set_power_state(data, false);
 490                 if (ret < 0) {
 491                         mutex_unlock(&data->mutex);
 492                         return ret;
 493                 }
 494
 495                 mutex_unlock(&data->mutex);
 496                 return IIO_VAL_INT;
 497         case IIO_CHAN_INFO_SCALE:
 498                 /*
 499                  * The API/driver performs an off-chip temperature
 500                  * compensation and outputs x/y/z magnetic field data in
 501                  * 16 LSB/uT to the upper application layer.
 502                  */
 503                 *val = 0;
 504                 *val2 = 625;
 505                 return IIO_VAL_INT_PLUS_MICRO;
 506         case IIO_CHAN_INFO_SAMP_FREQ:
 507                 ret = bmc150_magn_get_odr(data, val);
 508                 if (ret < 0)
 509                         return ret;
 510                 return IIO_VAL_INT;
 511         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
 512                 switch (chan->channel2) {
 513                 case IIO_MOD_X:
 514                 case IIO_MOD_Y:
 515                         ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY,
 516                                           &tmp);
 517                         if (ret < 0)
 518                                 return ret;
 519                         *val = BMC150_MAGN_REGVAL_TO_REPXY(tmp);
 520                         return IIO_VAL_INT;
 521                 case IIO_MOD_Z:
 522                         ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z,
 523                                           &tmp);
 524                         if (ret < 0)
 525                                 return ret;
 526                         *val = BMC150_MAGN_REGVAL_TO_REPZ(tmp);
 527                         return IIO_VAL_INT;
 528                 default:
 529                         return -EINVAL;
 530                 }
 531         default:
 532                 return -EINVAL;
 533         }
 534 }
 535
 536 static int bmc150_magn_write_raw(struct iio_dev *indio_dev,
 537                                  struct iio_chan_spec const *chan,
 538                                  int val, int val2, long mask)
 539 {
 540         struct bmc150_magn_data *data = iio_priv(indio_dev);
 541         int ret;
 542
 543         switch (mask) {
 544         case IIO_CHAN_INFO_SAMP_FREQ:
 545                 if (val > data->max_odr)
 546                         return -EINVAL;
 547                 mutex_lock(&data->mutex);
 548                 ret = bmc150_magn_set_odr(data, val);
 549                 mutex_unlock(&data->mutex);
 550                 return ret;
 551         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
 552                 switch (chan->channel2) {
 553                 case IIO_MOD_X:
 554                 case IIO_MOD_Y:
 555                         if (val < 1 || val > 511)
 556                                 return -EINVAL;
 557                         mutex_lock(&data->mutex);
 558                         ret = bmc150_magn_set_max_odr(data, val, 0, 0);
 559                         if (ret < 0) {
 560                                 mutex_unlock(&data->mutex);
 561                                 return ret;
 562                         }
 563                         ret = regmap_update_bits(data->regmap,
 564                                                  BMC150_MAGN_REG_REP_XY,
 565                                                  BMC150_MAGN_REG_REP_DATAMASK,
 566                                                  BMC150_MAGN_REPXY_TO_REGVAL
 567                                                  (val));
 568                         mutex_unlock(&data->mutex);
 569                         return ret;
 570                 case IIO_MOD_Z:
 571                         if (val < 1 || val > 256)
 572                                 return -EINVAL;
 573                         mutex_lock(&data->mutex);
 574                         ret = bmc150_magn_set_max_odr(data, 0, val, 0);
 575                         if (ret < 0) {
 576                                 mutex_unlock(&data->mutex);
 577                                 return ret;
 578                         }
 579                         ret = regmap_update_bits(data->regmap,
 580                                                  BMC150_MAGN_REG_REP_Z,
 581                                                  BMC150_MAGN_REG_REP_DATAMASK,
 582                                                  BMC150_MAGN_REPZ_TO_REGVAL
 583                                                  (val));
 584                         mutex_unlock(&data->mutex);
 585                         return ret;
 586                 default:
 587                         return -EINVAL;
 588                 }
 589         default:
 590                 return -EINVAL;
 591         }
 592 }
 593
 594 static ssize_t bmc150_magn_show_samp_freq_avail(struct device *dev,
 595                                                 struct device_attribute *attr,
 596                                                 char *buf)
 597 {
 598         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 599         struct bmc150_magn_data *data = iio_priv(indio_dev);
 600         size_t len = 0;
 601         u8 i;
 602
 603         for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
 604                 if (bmc150_magn_samp_freq_table[i].freq > data->max_odr)
 605                         break;
 606                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
 607                                  bmc150_magn_samp_freq_table[i].freq);
 608         }
 609         /* replace last space with a newline */
 610         buf[len - 1] = '\n';
 611
 612         return len;
 613 }
 614
 615 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(bmc150_magn_show_samp_freq_avail);
 616
 617 static struct attribute *bmc150_magn_attributes[] = {
 618         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 619         NULL,
 620 };
 621
 622 static const struct attribute_group bmc150_magn_attrs_group = {
 623         .attrs = bmc150_magn_attributes,
 624 };
 625
 626 #define BMC150_MAGN_CHANNEL(_axis) {                                    \
 627         .type = IIO_MAGN,                                               \
 628         .modified = 1,                                                  \
 629         .channel2 = IIO_MOD_##_axis,                                    \
 630         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |                  \
 631                               BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),    \
 632         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) |      \
 633                                     BIT(IIO_CHAN_INFO_SCALE),           \
 634         .scan_index = AXIS_##_axis,                                     \
 635         .scan_type = {                                                  \
 636                 .sign = 's',                                            \
 637                 .realbits = 32,                                         \
 638                 .storagebits = 32,                                      \
 639                 .endianness = IIO_LE                                    \
 640         },                                                              \
 641 }
 642
 643 static const struct iio_chan_spec bmc150_magn_channels[] = {
 644         BMC150_MAGN_CHANNEL(X),
 645         BMC150_MAGN_CHANNEL(Y),
 646         BMC150_MAGN_CHANNEL(Z),
 647         IIO_CHAN_SOFT_TIMESTAMP(3),
 648 };
 649
 650 static const struct iio_info bmc150_magn_info = {
 651         .attrs = &bmc150_magn_attrs_group,
 652         .read_raw = bmc150_magn_read_raw,
 653         .write_raw = bmc150_magn_write_raw,
 654         .driver_module = THIS_MODULE,
 655 };
 656
 657 static const unsigned long bmc150_magn_scan_masks[] = {
 658                                         BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
 659                                         0};
 660
 661 static irqreturn_t bmc150_magn_trigger_handler(int irq, void *p)
 662 {
 663         struct iio_poll_func *pf = p;
 664         struct iio_dev *indio_dev = pf->indio_dev;
 665         struct bmc150_magn_data *data = iio_priv(indio_dev);
 666         int ret;
 667
 668         mutex_lock(&data->mutex);
 669         ret = bmc150_magn_read_xyz(data, data->buffer);
 670         if (ret < 0)
 671                 goto err;
 672
 673         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 674                                            pf->timestamp);
 675
 676 err:
 677         mutex_unlock(&data->mutex);
 678         iio_trigger_notify_done(indio_dev->trig);
 679
 680         return IRQ_HANDLED;
 681 }
 682
 683 static int bmc150_magn_init(struct bmc150_magn_data *data)
 684 {
 685         int ret, chip_id;
 686         struct bmc150_magn_preset preset;
 687
 688         ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND,
 689                                          false);
 690         if (ret < 0) {
 691                 dev_err(data->dev,
 692                         "Failed to bring up device from suspend mode\n");
 693                 return ret;
 694         }
 695
 696         ret = regmap_read(data->regmap, BMC150_MAGN_REG_CHIP_ID, &chip_id);
 697         if (ret < 0) {
 698                 dev_err(data->dev, "Failed reading chip id\n");
 699                 goto err_poweroff;
 700         }
 701         if (chip_id != BMC150_MAGN_CHIP_ID_VAL) {
 702                 dev_err(data->dev, "Invalid chip id 0x%x\n", chip_id);
 703                 ret = -ENODEV;
 704                 goto err_poweroff;
 705         }
 706         dev_dbg(data->dev, "Chip id %x\n", chip_id);
 707
 708         preset = bmc150_magn_presets_table[BMC150_MAGN_DEFAULT_PRESET];
 709         ret = bmc150_magn_set_odr(data, preset.odr);
 710         if (ret < 0) {
 711                 dev_err(data->dev, "Failed to set ODR to %d\n",
 712                         preset.odr);
 713                 goto err_poweroff;
 714         }
 715
 716         ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_XY,
 717                            BMC150_MAGN_REPXY_TO_REGVAL(preset.rep_xy));
 718         if (ret < 0) {
 719                 dev_err(data->dev, "Failed to set REP XY to %d\n",
 720                         preset.rep_xy);
 721                 goto err_poweroff;
 722         }
 723
 724         ret = regmap_write(data->regmap, BMC150_MAGN_REG_REP_Z,
 725                            BMC150_MAGN_REPZ_TO_REGVAL(preset.rep_z));
 726         if (ret < 0) {
 727                 dev_err(data->dev, "Failed to set REP Z to %d\n",
 728                         preset.rep_z);
 729                 goto err_poweroff;
 730         }
 731
 732         ret = bmc150_magn_set_max_odr(data, preset.rep_xy, preset.rep_z,
 733                                       preset.odr);
 734         if (ret < 0)
 735                 goto err_poweroff;
 736
 737         ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
 738                                          true);
 739         if (ret < 0) {
 740                 dev_err(data->dev, "Failed to power on device\n");
 741                 goto err_poweroff;
 742         }
 743
 744         return 0;
 745
 746 err_poweroff:
 747         bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
 748         return ret;
 749 }
 750
 751 static int bmc150_magn_reset_intr(struct bmc150_magn_data *data)
 752 {
 753         int tmp;
 754
 755         /*
 756          * Data Ready (DRDY) is always cleared after
 757          * readout of data registers ends.
 758          */
 759         return regmap_read(data->regmap, BMC150_MAGN_REG_X_L, &tmp);
 760 }
 761
 762 static int bmc150_magn_trig_try_reen(struct iio_trigger *trig)
 763 {
 764         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 765         struct bmc150_magn_data *data = iio_priv(indio_dev);
 766         int ret;
 767
 768         if (!data->dready_trigger_on)
 769                 return 0;
 770
 771         mutex_lock(&data->mutex);
 772         ret = bmc150_magn_reset_intr(data);
 773         mutex_unlock(&data->mutex);
 774
 775         return ret;
 776 }
 777
 778 static int bmc150_magn_data_rdy_trigger_set_state(struct iio_trigger *trig,
 779                                                   bool state)
 780 {
 781         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 782         struct bmc150_magn_data *data = iio_priv(indio_dev);
 783         int ret = 0;
 784
 785         mutex_lock(&data->mutex);
 786         if (state == data->dready_trigger_on)
 787                 goto err_unlock;
 788
 789         ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_INT_DRDY,
 790                                  BMC150_MAGN_MASK_DRDY_EN,
 791                                  state << BMC150_MAGN_SHIFT_DRDY_EN);
 792         if (ret < 0)
 793                 goto err_unlock;
 794
 795         data->dready_trigger_on = state;
 796
 797         if (state) {
 798                 ret = bmc150_magn_reset_intr(data);
 799                 if (ret < 0)
 800                         goto err_unlock;
 801         }
 802         mutex_unlock(&data->mutex);
 803
 804         return 0;
 805
 806 err_unlock:
 807         mutex_unlock(&data->mutex);
 808         return ret;
 809 }
 810
 811 static const struct iio_trigger_ops bmc150_magn_trigger_ops = {
 812         .set_trigger_state = bmc150_magn_data_rdy_trigger_set_state,
 813         .try_reenable = bmc150_magn_trig_try_reen,
 814         .owner = THIS_MODULE,
 815 };
 816
 817 static int bmc150_magn_buffer_preenable(struct iio_dev *indio_dev)
 818 {
 819         struct bmc150_magn_data *data = iio_priv(indio_dev);
 820
 821         return bmc150_magn_set_power_state(data, true);
 822 }
 823
 824 static int bmc150_magn_buffer_postdisable(struct iio_dev *indio_dev)
 825 {
 826         struct bmc150_magn_data *data = iio_priv(indio_dev);
 827
 828         return bmc150_magn_set_power_state(data, false);
 829 }
 830
 831 static const struct iio_buffer_setup_ops bmc150_magn_buffer_setup_ops = {
 832         .preenable = bmc150_magn_buffer_preenable,
 833         .postenable = iio_triggered_buffer_postenable,
 834         .predisable = iio_triggered_buffer_predisable,
 835         .postdisable = bmc150_magn_buffer_postdisable,
 836 };
 837
 838 static const char *bmc150_magn_match_acpi_device(struct device *dev)
 839 {
 840         const struct acpi_device_id *id;
 841
 842         id = acpi_match_device(dev->driver->acpi_match_table, dev);
 843         if (!id)
 844                 return NULL;
 845
 846         return dev_name(dev);
 847 }
 848
 849 int bmc150_magn_probe(struct device *dev, struct regmap *regmap,
 850                       int irq, const char *name)
 851 {
 852         struct bmc150_magn_data *data;
 853         struct iio_dev *indio_dev;
 854         int ret;
 855
 856         indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
 857         if (!indio_dev)
 858                 return -ENOMEM;
 859
 860         data = iio_priv(indio_dev);
 861         dev_set_drvdata(dev, indio_dev);
 862         data->regmap = regmap;
 863         data->irq = irq;
 864         data->dev = dev;
 865
 866         if (!name && ACPI_HANDLE(dev))
 867                 name = bmc150_magn_match_acpi_device(dev);
 868
 869         mutex_init(&data->mutex);
 870
 871         ret = bmc150_magn_init(data);
 872         if (ret < 0)
 873                 return ret;
 874
 875         indio_dev->dev.parent = dev;
 876         indio_dev->channels = bmc150_magn_channels;
 877         indio_dev->num_channels = ARRAY_SIZE(bmc150_magn_channels);
 878         indio_dev->available_scan_masks = bmc150_magn_scan_masks;
 879         indio_dev->name = name;
 880         indio_dev->modes = INDIO_DIRECT_MODE;
 881         indio_dev->info = &bmc150_magn_info;
 882
 883         if (irq > 0) {
 884                 data->dready_trig = devm_iio_trigger_alloc(dev,
 885                                                            "%s-dev%d",
 886                                                            indio_dev->name,
 887                                                            indio_dev->id);
 888                 if (!data->dready_trig) {
 889                         ret = -ENOMEM;
 890                         dev_err(dev, "iio trigger alloc failed\n");
 891                         goto err_poweroff;
 892                 }
 893
 894                 data->dready_trig->dev.parent = dev;
 895                 data->dready_trig->ops = &bmc150_magn_trigger_ops;
 896                 iio_trigger_set_drvdata(data->dready_trig, indio_dev);
 897                 ret = iio_trigger_register(data->dready_trig);
 898                 if (ret) {
 899                         dev_err(dev, "iio trigger register failed\n");
 900                         goto err_poweroff;
 901                 }
 902
 903                 ret = request_threaded_irq(irq,
 904                                            iio_trigger_generic_data_rdy_poll,
 905                                            NULL,
 906                                            IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 907                                            BMC150_MAGN_IRQ_NAME,
 908                                            data->dready_trig);
 909                 if (ret < 0) {
 910                         dev_err(dev, "request irq %d failed\n", irq);
 911                         goto err_trigger_unregister;
 912                 }
 913         }
 914
 915         ret = iio_triggered_buffer_setup(indio_dev,
 916                                          iio_pollfunc_store_time,
 917                                          bmc150_magn_trigger_handler,
 918                                          &bmc150_magn_buffer_setup_ops);
 919         if (ret < 0) {
 920                 dev_err(dev, "iio triggered buffer setup failed\n");
 921                 goto err_free_irq;
 922         }
 923
 924         ret = pm_runtime_set_active(dev);
 925         if (ret)
 926                 goto err_buffer_cleanup;
 927
 928         pm_runtime_enable(dev);
 929         pm_runtime_set_autosuspend_delay(dev,
 930                                          BMC150_MAGN_AUTO_SUSPEND_DELAY_MS);
 931         pm_runtime_use_autosuspend(dev);
 932
 933         ret = iio_device_register(indio_dev);
 934         if (ret < 0) {
 935                 dev_err(dev, "unable to register iio device\n");
 936                 goto err_buffer_cleanup;
 937         }
 938
 939         dev_dbg(dev, "Registered device %s\n", name);
 940         return 0;
 941
 942 err_buffer_cleanup:
 943         iio_triggered_buffer_cleanup(indio_dev);
 944 err_free_irq:
 945         if (irq > 0)
 946                 free_irq(irq, data->dready_trig);
 947 err_trigger_unregister:
 948         if (data->dready_trig)
 949                 iio_trigger_unregister(data->dready_trig);
 950 err_poweroff:
 951         bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
 952         return ret;
 953 }
 954 EXPORT_SYMBOL(bmc150_magn_probe);
 955
 956 int bmc150_magn_remove(struct device *dev)
 957 {
 958         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 959         struct bmc150_magn_data *data = iio_priv(indio_dev);
 960
 961         iio_device_unregister(indio_dev);
 962
 963         pm_runtime_disable(dev);
 964         pm_runtime_set_suspended(dev);
 965         pm_runtime_put_noidle(dev);
 966
 967         iio_triggered_buffer_cleanup(indio_dev);
 968
 969         if (data->irq > 0)
 970                 free_irq(data->irq, data->dready_trig);
 971
 972         if (data->dready_trig)
 973                 iio_trigger_unregister(data->dready_trig);
 974
 975         mutex_lock(&data->mutex);
 976         bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SUSPEND, true);
 977         mutex_unlock(&data->mutex);
 978
 979         return 0;
 980 }
 981 EXPORT_SYMBOL(bmc150_magn_remove);
 982
 983 #ifdef CONFIG_PM
 984 static int bmc150_magn_runtime_suspend(struct device *dev)
 985 {
 986         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 987         struct bmc150_magn_data *data = iio_priv(indio_dev);
 988         int ret;
 989
 990         mutex_lock(&data->mutex);
 991         ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP,
 992                                          true);
 993         mutex_unlock(&data->mutex);
 994         if (ret < 0) {
 995                 dev_err(dev, "powering off device failed\n");
 996                 return ret;
 997         }
 998         return 0;
 999 }
1000
1001 /*
1002  * Should be called with data->mutex held.
1003  */
1004 static int bmc150_magn_runtime_resume(struct device *dev)
1005 {
1006         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1007         struct bmc150_magn_data *data = iio_priv(indio_dev);
1008
1009         return bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
1010                                           true);
1011 }
1012 #endif
1013
1014 #ifdef CONFIG_PM_SLEEP
1015 static int bmc150_magn_suspend(struct device *dev)
1016 {
1017         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1018         struct bmc150_magn_data *data = iio_priv(indio_dev);
1019         int ret;
1020
1021         mutex_lock(&data->mutex);
1022         ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_SLEEP,
1023                                          true);
1024         mutex_unlock(&data->mutex);
1025
1026         return ret;
1027 }
1028
1029 static int bmc150_magn_resume(struct device *dev)
1030 {
1031         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1032         struct bmc150_magn_data *data = iio_priv(indio_dev);
1033         int ret;
1034
1035         mutex_lock(&data->mutex);
1036         ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
1037                                          true);
1038         mutex_unlock(&data->mutex);
1039
1040         return ret;
1041 }
1042 #endif
1043
1044 const struct dev_pm_ops bmc150_magn_pm_ops = {
1045         SET_SYSTEM_SLEEP_PM_OPS(bmc150_magn_suspend, bmc150_magn_resume)
1046         SET_RUNTIME_PM_OPS(bmc150_magn_runtime_suspend,
1047                            bmc150_magn_runtime_resume, NULL)
1048 };
1049 EXPORT_SYMBOL(bmc150_magn_pm_ops);
1050
1051 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1052 MODULE_LICENSE("GPL v2");
1053 MODULE_DESCRIPTION("BMC150 magnetometer core driver");