kernel/drivers/iio/accel/bmc150-accel-core.c

   1 /*
   2  * 3-axis accelerometer driver supporting following Bosch-Sensortec chips:
   3  *  - BMC150
   4  *  - BMI055
   5  *  - BMA255
   6  *  - BMA250E
   7  *  - BMA222E
   8  *  - BMA280
   9  *
  10  * Copyright (c) 2014, Intel Corporation.
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms and conditions of the GNU General Public License,
  14  * version 2, as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope it will be useful, but WITHOUT
  17  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  19  * more details.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/i2c.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/delay.h>
  26 #include <linux/slab.h>
  27 #include <linux/acpi.h>
  28 #include <linux/gpio/consumer.h>
  29 #include <linux/pm.h>
  30 #include <linux/pm_runtime.h>
  31 #include <linux/iio/iio.h>
  32 #include <linux/iio/sysfs.h>
  33 #include <linux/iio/buffer.h>
  34 #include <linux/iio/events.h>
  35 #include <linux/iio/trigger.h>
  36 #include <linux/iio/trigger_consumer.h>
  37 #include <linux/iio/triggered_buffer.h>
  38 #include <linux/regmap.h>
  39
  40 #include "bmc150-accel.h"
  41
  42 #define BMC150_ACCEL_DRV_NAME                   "bmc150_accel"
  43 #define BMC150_ACCEL_IRQ_NAME                   "bmc150_accel_event"
  44
  45 #define BMC150_ACCEL_REG_CHIP_ID                0x00
  46
  47 #define BMC150_ACCEL_REG_INT_STATUS_2           0x0B
  48 #define BMC150_ACCEL_ANY_MOTION_MASK            0x07
  49 #define BMC150_ACCEL_ANY_MOTION_BIT_X           BIT(0)
  50 #define BMC150_ACCEL_ANY_MOTION_BIT_Y           BIT(1)
  51 #define BMC150_ACCEL_ANY_MOTION_BIT_Z           BIT(2)
  52 #define BMC150_ACCEL_ANY_MOTION_BIT_SIGN        BIT(3)
  53
  54 #define BMC150_ACCEL_REG_PMU_LPW                0x11
  55 #define BMC150_ACCEL_PMU_MODE_MASK              0xE0
  56 #define BMC150_ACCEL_PMU_MODE_SHIFT             5
  57 #define BMC150_ACCEL_PMU_BIT_SLEEP_DUR_MASK     0x17
  58 #define BMC150_ACCEL_PMU_BIT_SLEEP_DUR_SHIFT    1
  59
  60 #define BMC150_ACCEL_REG_PMU_RANGE              0x0F
  61
  62 #define BMC150_ACCEL_DEF_RANGE_2G               0x03
  63 #define BMC150_ACCEL_DEF_RANGE_4G               0x05
  64 #define BMC150_ACCEL_DEF_RANGE_8G               0x08
  65 #define BMC150_ACCEL_DEF_RANGE_16G              0x0C
  66
  67 /* Default BW: 125Hz */
  68 #define BMC150_ACCEL_REG_PMU_BW         0x10
  69 #define BMC150_ACCEL_DEF_BW                     125
  70
  71 #define BMC150_ACCEL_REG_INT_MAP_0              0x19
  72 #define BMC150_ACCEL_INT_MAP_0_BIT_SLOPE        BIT(2)
  73
  74 #define BMC150_ACCEL_REG_INT_MAP_1              0x1A
  75 #define BMC150_ACCEL_INT_MAP_1_BIT_DATA         BIT(0)
  76 #define BMC150_ACCEL_INT_MAP_1_BIT_FWM          BIT(1)
  77 #define BMC150_ACCEL_INT_MAP_1_BIT_FFULL        BIT(2)
  78
  79 #define BMC150_ACCEL_REG_INT_RST_LATCH          0x21
  80 #define BMC150_ACCEL_INT_MODE_LATCH_RESET       0x80
  81 #define BMC150_ACCEL_INT_MODE_LATCH_INT 0x0F
  82 #define BMC150_ACCEL_INT_MODE_NON_LATCH_INT     0x00
  83
  84 #define BMC150_ACCEL_REG_INT_EN_0               0x16
  85 #define BMC150_ACCEL_INT_EN_BIT_SLP_X           BIT(0)
  86 #define BMC150_ACCEL_INT_EN_BIT_SLP_Y           BIT(1)
  87 #define BMC150_ACCEL_INT_EN_BIT_SLP_Z           BIT(2)
  88
  89 #define BMC150_ACCEL_REG_INT_EN_1               0x17
  90 #define BMC150_ACCEL_INT_EN_BIT_DATA_EN         BIT(4)
  91 #define BMC150_ACCEL_INT_EN_BIT_FFULL_EN        BIT(5)
  92 #define BMC150_ACCEL_INT_EN_BIT_FWM_EN          BIT(6)
  93
  94 #define BMC150_ACCEL_REG_INT_OUT_CTRL           0x20
  95 #define BMC150_ACCEL_INT_OUT_CTRL_INT1_LVL      BIT(0)
  96
  97 #define BMC150_ACCEL_REG_INT_5                  0x27
  98 #define BMC150_ACCEL_SLOPE_DUR_MASK             0x03
  99
 100 #define BMC150_ACCEL_REG_INT_6                  0x28
 101 #define BMC150_ACCEL_SLOPE_THRES_MASK           0xFF
 102
 103 /* Slope duration in terms of number of samples */
 104 #define BMC150_ACCEL_DEF_SLOPE_DURATION         1
 105 /* in terms of multiples of g's/LSB, based on range */
 106 #define BMC150_ACCEL_DEF_SLOPE_THRESHOLD        1
 107
 108 #define BMC150_ACCEL_REG_XOUT_L         0x02
 109
 110 #define BMC150_ACCEL_MAX_STARTUP_TIME_MS        100
 111
 112 /* Sleep Duration values */
 113 #define BMC150_ACCEL_SLEEP_500_MICRO            0x05
 114 #define BMC150_ACCEL_SLEEP_1_MS         0x06
 115 #define BMC150_ACCEL_SLEEP_2_MS         0x07
 116 #define BMC150_ACCEL_SLEEP_4_MS         0x08
 117 #define BMC150_ACCEL_SLEEP_6_MS         0x09
 118 #define BMC150_ACCEL_SLEEP_10_MS                0x0A
 119 #define BMC150_ACCEL_SLEEP_25_MS                0x0B
 120 #define BMC150_ACCEL_SLEEP_50_MS                0x0C
 121 #define BMC150_ACCEL_SLEEP_100_MS               0x0D
 122 #define BMC150_ACCEL_SLEEP_500_MS               0x0E
 123 #define BMC150_ACCEL_SLEEP_1_SEC                0x0F
 124
 125 #define BMC150_ACCEL_REG_TEMP                   0x08
 126 #define BMC150_ACCEL_TEMP_CENTER_VAL            24
 127
 128 #define BMC150_ACCEL_AXIS_TO_REG(axis)  (BMC150_ACCEL_REG_XOUT_L + (axis * 2))
 129 #define BMC150_AUTO_SUSPEND_DELAY_MS            2000
 130
 131 #define BMC150_ACCEL_REG_FIFO_STATUS            0x0E
 132 #define BMC150_ACCEL_REG_FIFO_CONFIG0           0x30
 133 #define BMC150_ACCEL_REG_FIFO_CONFIG1           0x3E
 134 #define BMC150_ACCEL_REG_FIFO_DATA              0x3F
 135 #define BMC150_ACCEL_FIFO_LENGTH                32
 136
 137 enum bmc150_accel_axis {
 138         AXIS_X,
 139         AXIS_Y,
 140         AXIS_Z,
 141 };
 142
 143 enum bmc150_power_modes {
 144         BMC150_ACCEL_SLEEP_MODE_NORMAL,
 145         BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND,
 146         BMC150_ACCEL_SLEEP_MODE_LPM,
 147         BMC150_ACCEL_SLEEP_MODE_SUSPEND = 0x04,
 148 };
 149
 150 struct bmc150_scale_info {
 151         int scale;
 152         u8 reg_range;
 153 };
 154
 155 struct bmc150_accel_chip_info {
 156         const char *name;
 157         u8 chip_id;
 158         const struct iio_chan_spec *channels;
 159         int num_channels;
 160         const struct bmc150_scale_info scale_table[4];
 161 };
 162
 163 struct bmc150_accel_interrupt {
 164         const struct bmc150_accel_interrupt_info *info;
 165         atomic_t users;
 166 };
 167
 168 struct bmc150_accel_trigger {
 169         struct bmc150_accel_data *data;
 170         struct iio_trigger *indio_trig;
 171         int (*setup)(struct bmc150_accel_trigger *t, bool state);
 172         int intr;
 173         bool enabled;
 174 };
 175
 176 enum bmc150_accel_interrupt_id {
 177         BMC150_ACCEL_INT_DATA_READY,
 178         BMC150_ACCEL_INT_ANY_MOTION,
 179         BMC150_ACCEL_INT_WATERMARK,
 180         BMC150_ACCEL_INTERRUPTS,
 181 };
 182
 183 enum bmc150_accel_trigger_id {
 184         BMC150_ACCEL_TRIGGER_DATA_READY,
 185         BMC150_ACCEL_TRIGGER_ANY_MOTION,
 186         BMC150_ACCEL_TRIGGERS,
 187 };
 188
 189 struct bmc150_accel_data {
 190         struct regmap *regmap;
 191         struct device *dev;
 192         int irq;
 193         struct bmc150_accel_interrupt interrupts[BMC150_ACCEL_INTERRUPTS];
 194         atomic_t active_intr;
 195         struct bmc150_accel_trigger triggers[BMC150_ACCEL_TRIGGERS];
 196         struct mutex mutex;
 197         u8 fifo_mode, watermark;
 198         s16 buffer[8];
 199         u8 bw_bits;
 200         u32 slope_dur;
 201         u32 slope_thres;
 202         u32 range;
 203         int ev_enable_state;
 204         int64_t timestamp, old_timestamp; /* Only used in hw fifo mode. */
 205         const struct bmc150_accel_chip_info *chip_info;
 206 };
 207
 208 static const struct {
 209         int val;
 210         int val2;
 211         u8 bw_bits;
 212 } bmc150_accel_samp_freq_table[] = { {15, 620000, 0x08},
 213                                      {31, 260000, 0x09},
 214                                      {62, 500000, 0x0A},
 215                                      {125, 0, 0x0B},
 216                                      {250, 0, 0x0C},
 217                                      {500, 0, 0x0D},
 218                                      {1000, 0, 0x0E},
 219                                      {2000, 0, 0x0F} };
 220
 221 static const struct {
 222         int bw_bits;
 223         int msec;
 224 } bmc150_accel_sample_upd_time[] = { {0x08, 64},
 225                                      {0x09, 32},
 226                                      {0x0A, 16},
 227                                      {0x0B, 8},
 228                                      {0x0C, 4},
 229                                      {0x0D, 2},
 230                                      {0x0E, 1},
 231                                      {0x0F, 1} };
 232
 233 static const struct {
 234         int sleep_dur;
 235         u8 reg_value;
 236 } bmc150_accel_sleep_value_table[] = { {0, 0},
 237                                        {500, BMC150_ACCEL_SLEEP_500_MICRO},
 238                                        {1000, BMC150_ACCEL_SLEEP_1_MS},
 239                                        {2000, BMC150_ACCEL_SLEEP_2_MS},
 240                                        {4000, BMC150_ACCEL_SLEEP_4_MS},
 241                                        {6000, BMC150_ACCEL_SLEEP_6_MS},
 242                                        {10000, BMC150_ACCEL_SLEEP_10_MS},
 243                                        {25000, BMC150_ACCEL_SLEEP_25_MS},
 244                                        {50000, BMC150_ACCEL_SLEEP_50_MS},
 245                                        {100000, BMC150_ACCEL_SLEEP_100_MS},
 246                                        {500000, BMC150_ACCEL_SLEEP_500_MS},
 247                                        {1000000, BMC150_ACCEL_SLEEP_1_SEC} };
 248
 249 static const struct regmap_config bmc150_i2c_regmap_conf = {
 250         .reg_bits = 8,
 251         .val_bits = 8,
 252         .max_register = 0x3f,
 253 };
 254
 255 static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
 256                                  enum bmc150_power_modes mode,
 257                                  int dur_us)
 258 {
 259         int i;
 260         int ret;
 261         u8 lpw_bits;
 262         int dur_val = -1;
 263
 264         if (dur_us > 0) {
 265                 for (i = 0; i < ARRAY_SIZE(bmc150_accel_sleep_value_table);
 266                                                                          ++i) {
 267                         if (bmc150_accel_sleep_value_table[i].sleep_dur ==
 268                                                                         dur_us)
 269                                 dur_val =
 270                                 bmc150_accel_sleep_value_table[i].reg_value;
 271                 }
 272         } else {
 273                 dur_val = 0;
 274         }
 275
 276         if (dur_val < 0)
 277                 return -EINVAL;
 278
 279         lpw_bits = mode << BMC150_ACCEL_PMU_MODE_SHIFT;
 280         lpw_bits |= (dur_val << BMC150_ACCEL_PMU_BIT_SLEEP_DUR_SHIFT);
 281
 282         dev_dbg(data->dev, "Set Mode bits %x\n", lpw_bits);
 283
 284         ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_LPW, lpw_bits);
 285         if (ret < 0) {
 286                 dev_err(data->dev, "Error writing reg_pmu_lpw\n");
 287                 return ret;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
 294                                int val2)
 295 {
 296         int i;
 297         int ret;
 298
 299         for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) {
 300                 if (bmc150_accel_samp_freq_table[i].val == val &&
 301                     bmc150_accel_samp_freq_table[i].val2 == val2) {
 302                         ret = regmap_write(data->regmap,
 303                                 BMC150_ACCEL_REG_PMU_BW,
 304                                 bmc150_accel_samp_freq_table[i].bw_bits);
 305                         if (ret < 0)
 306                                 return ret;
 307
 308                         data->bw_bits =
 309                                 bmc150_accel_samp_freq_table[i].bw_bits;
 310                         return 0;
 311                 }
 312         }
 313
 314         return -EINVAL;
 315 }
 316
 317 static int bmc150_accel_update_slope(struct bmc150_accel_data *data)
 318 {
 319         int ret;
 320
 321         ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_6,
 322                                         data->slope_thres);
 323         if (ret < 0) {
 324                 dev_err(data->dev, "Error writing reg_int_6\n");
 325                 return ret;
 326         }
 327
 328         ret = regmap_update_bits(data->regmap, BMC150_ACCEL_REG_INT_5,
 329                                  BMC150_ACCEL_SLOPE_DUR_MASK, data->slope_dur);
 330         if (ret < 0) {
 331                 dev_err(data->dev, "Error updating reg_int_5\n");
 332                 return ret;
 333         }
 334
 335         dev_dbg(data->dev, "%s: %x %x\n", __func__, data->slope_thres,
 336                 data->slope_dur);
 337
 338         return ret;
 339 }
 340
 341 static int bmc150_accel_any_motion_setup(struct bmc150_accel_trigger *t,
 342                                          bool state)
 343 {
 344         if (state)
 345                 return bmc150_accel_update_slope(t->data);
 346
 347         return 0;
 348 }
 349
 350 static int bmc150_accel_get_bw(struct bmc150_accel_data *data, int *val,
 351                                int *val2)
 352 {
 353         int i;
 354
 355         for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) {
 356                 if (bmc150_accel_samp_freq_table[i].bw_bits == data->bw_bits) {
 357                         *val = bmc150_accel_samp_freq_table[i].val;
 358                         *val2 = bmc150_accel_samp_freq_table[i].val2;
 359                         return IIO_VAL_INT_PLUS_MICRO;
 360                 }
 361         }
 362
 363         return -EINVAL;
 364 }
 365
 366 #ifdef CONFIG_PM
 367 static int bmc150_accel_get_startup_times(struct bmc150_accel_data *data)
 368 {
 369         int i;
 370
 371         for (i = 0; i < ARRAY_SIZE(bmc150_accel_sample_upd_time); ++i) {
 372                 if (bmc150_accel_sample_upd_time[i].bw_bits == data->bw_bits)
 373                         return bmc150_accel_sample_upd_time[i].msec;
 374         }
 375
 376         return BMC150_ACCEL_MAX_STARTUP_TIME_MS;
 377 }
 378
 379 static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on)
 380 {
 381         int ret;
 382
 383         if (on) {
 384                 ret = pm_runtime_get_sync(data->dev);
 385         } else {
 386                 pm_runtime_mark_last_busy(data->dev);
 387                 ret = pm_runtime_put_autosuspend(data->dev);
 388         }
 389
 390         if (ret < 0) {
 391                 dev_err(data->dev,
 392                         "Failed: bmc150_accel_set_power_state for %d\n", on);
 393                 if (on)
 394                         pm_runtime_put_noidle(data->dev);
 395
 396                 return ret;
 397         }
 398
 399         return 0;
 400 }
 401 #else
 402 static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on)
 403 {
 404         return 0;
 405 }
 406 #endif
 407
 408 static const struct bmc150_accel_interrupt_info {
 409         u8 map_reg;
 410         u8 map_bitmask;
 411         u8 en_reg;
 412         u8 en_bitmask;
 413 } bmc150_accel_interrupts[BMC150_ACCEL_INTERRUPTS] = {
 414         { /* data ready interrupt */
 415                 .map_reg = BMC150_ACCEL_REG_INT_MAP_1,
 416                 .map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_DATA,
 417                 .en_reg = BMC150_ACCEL_REG_INT_EN_1,
 418                 .en_bitmask = BMC150_ACCEL_INT_EN_BIT_DATA_EN,
 419         },
 420         {  /* motion interrupt */
 421                 .map_reg = BMC150_ACCEL_REG_INT_MAP_0,
 422                 .map_bitmask = BMC150_ACCEL_INT_MAP_0_BIT_SLOPE,
 423                 .en_reg = BMC150_ACCEL_REG_INT_EN_0,
 424                 .en_bitmask =  BMC150_ACCEL_INT_EN_BIT_SLP_X |
 425                         BMC150_ACCEL_INT_EN_BIT_SLP_Y |
 426                         BMC150_ACCEL_INT_EN_BIT_SLP_Z
 427         },
 428         { /* fifo watermark interrupt */
 429                 .map_reg = BMC150_ACCEL_REG_INT_MAP_1,
 430                 .map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_FWM,
 431                 .en_reg = BMC150_ACCEL_REG_INT_EN_1,
 432                 .en_bitmask = BMC150_ACCEL_INT_EN_BIT_FWM_EN,
 433         },
 434 };
 435
 436 static void bmc150_accel_interrupts_setup(struct iio_dev *indio_dev,
 437                                           struct bmc150_accel_data *data)
 438 {
 439         int i;
 440
 441         for (i = 0; i < BMC150_ACCEL_INTERRUPTS; i++)
 442                 data->interrupts[i].info = &bmc150_accel_interrupts[i];
 443 }
 444
 445 static int bmc150_accel_set_interrupt(struct bmc150_accel_data *data, int i,
 446                                       bool state)
 447 {
 448         struct bmc150_accel_interrupt *intr = &data->interrupts[i];
 449         const struct bmc150_accel_interrupt_info *info = intr->info;
 450         int ret;
 451
 452         if (state) {
 453                 if (atomic_inc_return(&intr->users) > 1)
 454                         return 0;
 455         } else {
 456                 if (atomic_dec_return(&intr->users) > 0)
 457                         return 0;
 458         }
 459
 460         /*
 461          * We will expect the enable and disable to do operation in reverse
 462          * order. This will happen here anyway, as our resume operation uses
 463          * sync mode runtime pm calls. The suspend operation will be delayed
 464          * by autosuspend delay.
 465          * So the disable operation will still happen in reverse order of
 466          * enable operation. When runtime pm is disabled the mode is always on,
 467          * so sequence doesn't matter.
 468          */
 469         ret = bmc150_accel_set_power_state(data, state);
 470         if (ret < 0)
 471                 return ret;
 472
 473         /* map the interrupt to the appropriate pins */
 474         ret = regmap_update_bits(data->regmap, info->map_reg, info->map_bitmask,
 475                                  (state ? info->map_bitmask : 0));
 476         if (ret < 0) {
 477                 dev_err(data->dev, "Error updating reg_int_map\n");
 478                 goto out_fix_power_state;
 479         }
 480
 481         /* enable/disable the interrupt */
 482         ret = regmap_update_bits(data->regmap, info->en_reg, info->en_bitmask,
 483                                  (state ? info->en_bitmask : 0));
 484         if (ret < 0) {
 485                 dev_err(data->dev, "Error updating reg_int_en\n");
 486                 goto out_fix_power_state;
 487         }
 488
 489         if (state)
 490                 atomic_inc(&data->active_intr);
 491         else
 492                 atomic_dec(&data->active_intr);
 493
 494         return 0;
 495
 496 out_fix_power_state:
 497         bmc150_accel_set_power_state(data, false);
 498         return ret;
 499 }
 500
 501 static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
 502 {
 503         int ret, i;
 504
 505         for (i = 0; i < ARRAY_SIZE(data->chip_info->scale_table); ++i) {
 506                 if (data->chip_info->scale_table[i].scale == val) {
 507                         ret = regmap_write(data->regmap,
 508                                      BMC150_ACCEL_REG_PMU_RANGE,
 509                                      data->chip_info->scale_table[i].reg_range);
 510                         if (ret < 0) {
 511                                 dev_err(data->dev,
 512                                         "Error writing pmu_range\n");
 513                                 return ret;
 514                         }
 515
 516                         data->range = data->chip_info->scale_table[i].reg_range;
 517                         return 0;
 518                 }
 519         }
 520
 521         return -EINVAL;
 522 }
 523
 524 static int bmc150_accel_get_temp(struct bmc150_accel_data *data, int *val)
 525 {
 526         int ret;
 527         unsigned int value;
 528
 529         mutex_lock(&data->mutex);
 530
 531         ret = regmap_read(data->regmap, BMC150_ACCEL_REG_TEMP, &value);
 532         if (ret < 0) {
 533                 dev_err(data->dev, "Error reading reg_temp\n");
 534                 mutex_unlock(&data->mutex);
 535                 return ret;
 536         }
 537         *val = sign_extend32(value, 7);
 538
 539         mutex_unlock(&data->mutex);
 540
 541         return IIO_VAL_INT;
 542 }
 543
 544 static int bmc150_accel_get_axis(struct bmc150_accel_data *data,
 545                                  struct iio_chan_spec const *chan,
 546                                  int *val)
 547 {
 548         int ret;
 549         int axis = chan->scan_index;
 550         unsigned int raw_val;
 551
 552         mutex_lock(&data->mutex);
 553         ret = bmc150_accel_set_power_state(data, true);
 554         if (ret < 0) {
 555                 mutex_unlock(&data->mutex);
 556                 return ret;
 557         }
 558
 559         ret = regmap_bulk_read(data->regmap, BMC150_ACCEL_AXIS_TO_REG(axis),
 560                                &raw_val, 2);
 561         if (ret < 0) {
 562                 dev_err(data->dev, "Error reading axis %d\n", axis);
 563                 bmc150_accel_set_power_state(data, false);
 564                 mutex_unlock(&data->mutex);
 565                 return ret;
 566         }
 567         *val = sign_extend32(raw_val >> chan->scan_type.shift,
 568                              chan->scan_type.realbits - 1);
 569         ret = bmc150_accel_set_power_state(data, false);
 570         mutex_unlock(&data->mutex);
 571         if (ret < 0)
 572                 return ret;
 573
 574         return IIO_VAL_INT;
 575 }
 576
 577 static int bmc150_accel_read_raw(struct iio_dev *indio_dev,
 578                                  struct iio_chan_spec const *chan,
 579                                  int *val, int *val2, long mask)
 580 {
 581         struct bmc150_accel_data *data = iio_priv(indio_dev);
 582         int ret;
 583
 584         switch (mask) {
 585         case IIO_CHAN_INFO_RAW:
 586                 switch (chan->type) {
 587                 case IIO_TEMP:
 588                         return bmc150_accel_get_temp(data, val);
 589                 case IIO_ACCEL:
 590                         if (iio_buffer_enabled(indio_dev))
 591                                 return -EBUSY;
 592                         else
 593                                 return bmc150_accel_get_axis(data, chan, val);
 594                 default:
 595                         return -EINVAL;
 596                 }
 597         case IIO_CHAN_INFO_OFFSET:
 598                 if (chan->type == IIO_TEMP) {
 599                         *val = BMC150_ACCEL_TEMP_CENTER_VAL;
 600                         return IIO_VAL_INT;
 601                 } else {
 602                         return -EINVAL;
 603                 }
 604         case IIO_CHAN_INFO_SCALE:
 605                 *val = 0;
 606                 switch (chan->type) {
 607                 case IIO_TEMP:
 608                         *val2 = 500000;
 609                         return IIO_VAL_INT_PLUS_MICRO;
 610                 case IIO_ACCEL:
 611                 {
 612                         int i;
 613                         const struct bmc150_scale_info *si;
 614                         int st_size = ARRAY_SIZE(data->chip_info->scale_table);
 615
 616                         for (i = 0; i < st_size; ++i) {
 617                                 si = &data->chip_info->scale_table[i];
 618                                 if (si->reg_range == data->range) {
 619                                         *val2 = si->scale;
 620                                         return IIO_VAL_INT_PLUS_MICRO;
 621                                 }
 622                         }
 623                         return -EINVAL;
 624                 }
 625                 default:
 626                         return -EINVAL;
 627                 }
 628         case IIO_CHAN_INFO_SAMP_FREQ:
 629                 mutex_lock(&data->mutex);
 630                 ret = bmc150_accel_get_bw(data, val, val2);
 631                 mutex_unlock(&data->mutex);
 632                 return ret;
 633         default:
 634                 return -EINVAL;
 635         }
 636 }
 637
 638 static int bmc150_accel_write_raw(struct iio_dev *indio_dev,
 639                                   struct iio_chan_spec const *chan,
 640                                   int val, int val2, long mask)
 641 {
 642         struct bmc150_accel_data *data = iio_priv(indio_dev);
 643         int ret;
 644
 645         switch (mask) {
 646         case IIO_CHAN_INFO_SAMP_FREQ:
 647                 mutex_lock(&data->mutex);
 648                 ret = bmc150_accel_set_bw(data, val, val2);
 649                 mutex_unlock(&data->mutex);
 650                 break;
 651         case IIO_CHAN_INFO_SCALE:
 652                 if (val)
 653                         return -EINVAL;
 654
 655                 mutex_lock(&data->mutex);
 656                 ret = bmc150_accel_set_scale(data, val2);
 657                 mutex_unlock(&data->mutex);
 658                 return ret;
 659         default:
 660                 ret = -EINVAL;
 661         }
 662
 663         return ret;
 664 }
 665
 666 static int bmc150_accel_read_event(struct iio_dev *indio_dev,
 667                                    const struct iio_chan_spec *chan,
 668                                    enum iio_event_type type,
 669                                    enum iio_event_direction dir,
 670                                    enum iio_event_info info,
 671                                    int *val, int *val2)
 672 {
 673         struct bmc150_accel_data *data = iio_priv(indio_dev);
 674
 675         *val2 = 0;
 676         switch (info) {
 677         case IIO_EV_INFO_VALUE:
 678                 *val = data->slope_thres;
 679                 break;
 680         case IIO_EV_INFO_PERIOD:
 681                 *val = data->slope_dur;
 682                 break;
 683         default:
 684                 return -EINVAL;
 685         }
 686
 687         return IIO_VAL_INT;
 688 }
 689
 690 static int bmc150_accel_write_event(struct iio_dev *indio_dev,
 691                                     const struct iio_chan_spec *chan,
 692                                     enum iio_event_type type,
 693                                     enum iio_event_direction dir,
 694                                     enum iio_event_info info,
 695                                     int val, int val2)
 696 {
 697         struct bmc150_accel_data *data = iio_priv(indio_dev);
 698
 699         if (data->ev_enable_state)
 700                 return -EBUSY;
 701
 702         switch (info) {
 703         case IIO_EV_INFO_VALUE:
 704                 data->slope_thres = val & BMC150_ACCEL_SLOPE_THRES_MASK;
 705                 break;
 706         case IIO_EV_INFO_PERIOD:
 707                 data->slope_dur = val & BMC150_ACCEL_SLOPE_DUR_MASK;
 708                 break;
 709         default:
 710                 return -EINVAL;
 711         }
 712
 713         return 0;
 714 }
 715
 716 static int bmc150_accel_read_event_config(struct iio_dev *indio_dev,
 717                                           const struct iio_chan_spec *chan,
 718                                           enum iio_event_type type,
 719                                           enum iio_event_direction dir)
 720 {
 721         struct bmc150_accel_data *data = iio_priv(indio_dev);
 722
 723         return data->ev_enable_state;
 724 }
 725
 726 static int bmc150_accel_write_event_config(struct iio_dev *indio_dev,
 727                                            const struct iio_chan_spec *chan,
 728                                            enum iio_event_type type,
 729                                            enum iio_event_direction dir,
 730                                            int state)
 731 {
 732         struct bmc150_accel_data *data = iio_priv(indio_dev);
 733         int ret;
 734
 735         if (state == data->ev_enable_state)
 736                 return 0;
 737
 738         mutex_lock(&data->mutex);
 739
 740         ret = bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_ANY_MOTION,
 741                                          state);
 742         if (ret < 0) {
 743                 mutex_unlock(&data->mutex);
 744                 return ret;
 745         }
 746
 747         data->ev_enable_state = state;
 748         mutex_unlock(&data->mutex);
 749
 750         return 0;
 751 }
 752
 753 static int bmc150_accel_validate_trigger(struct iio_dev *indio_dev,
 754                                          struct iio_trigger *trig)
 755 {
 756         struct bmc150_accel_data *data = iio_priv(indio_dev);
 757         int i;
 758
 759         for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) {
 760                 if (data->triggers[i].indio_trig == trig)
 761                         return 0;
 762         }
 763
 764         return -EINVAL;
 765 }
 766
 767 static ssize_t bmc150_accel_get_fifo_watermark(struct device *dev,
 768                                                struct device_attribute *attr,
 769                                                char *buf)
 770 {
 771         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 772         struct bmc150_accel_data *data = iio_priv(indio_dev);
 773         int wm;
 774
 775         mutex_lock(&data->mutex);
 776         wm = data->watermark;
 777         mutex_unlock(&data->mutex);
 778
 779         return sprintf(buf, "%d\n", wm);
 780 }
 781
 782 static ssize_t bmc150_accel_get_fifo_state(struct device *dev,
 783                                            struct device_attribute *attr,
 784                                            char *buf)
 785 {
 786         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 787         struct bmc150_accel_data *data = iio_priv(indio_dev);
 788         bool state;
 789
 790         mutex_lock(&data->mutex);
 791         state = data->fifo_mode;
 792         mutex_unlock(&data->mutex);
 793
 794         return sprintf(buf, "%d\n", state);
 795 }
 796
 797 static IIO_CONST_ATTR(hwfifo_watermark_min, "1");
 798 static IIO_CONST_ATTR(hwfifo_watermark_max,
 799                       __stringify(BMC150_ACCEL_FIFO_LENGTH));
 800 static IIO_DEVICE_ATTR(hwfifo_enabled, S_IRUGO,
 801                        bmc150_accel_get_fifo_state, NULL, 0);
 802 static IIO_DEVICE_ATTR(hwfifo_watermark, S_IRUGO,
 803                        bmc150_accel_get_fifo_watermark, NULL, 0);
 804
 805 static const struct attribute *bmc150_accel_fifo_attributes[] = {
 806         &iio_const_attr_hwfifo_watermark_min.dev_attr.attr,
 807         &iio_const_attr_hwfifo_watermark_max.dev_attr.attr,
 808         &iio_dev_attr_hwfifo_watermark.dev_attr.attr,
 809         &iio_dev_attr_hwfifo_enabled.dev_attr.attr,
 810         NULL,
 811 };
 812
 813 static int bmc150_accel_set_watermark(struct iio_dev *indio_dev, unsigned val)
 814 {
 815         struct bmc150_accel_data *data = iio_priv(indio_dev);
 816
 817         if (val > BMC150_ACCEL_FIFO_LENGTH)
 818                 val = BMC150_ACCEL_FIFO_LENGTH;
 819
 820         mutex_lock(&data->mutex);
 821         data->watermark = val;
 822         mutex_unlock(&data->mutex);
 823
 824         return 0;
 825 }
 826
 827 /*
 828  * We must read at least one full frame in one burst, otherwise the rest of the
 829  * frame data is discarded.
 830  */
 831 static int bmc150_accel_fifo_transfer(struct bmc150_accel_data *data,
 832                                       char *buffer, int samples)
 833 {
 834         int sample_length = 3 * 2;
 835         int ret;
 836         int total_length = samples * sample_length;
 837         int i;
 838         size_t step = regmap_get_raw_read_max(data->regmap);
 839
 840         if (!step || step > total_length)
 841                 step = total_length;
 842         else if (step < total_length)
 843                 step = sample_length;
 844
 845         /*
 846          * Seems we have a bus with size limitation so we have to execute
 847          * multiple reads
 848          */
 849         for (i = 0; i < total_length; i += step) {
 850                 ret = regmap_raw_read(data->regmap, BMC150_ACCEL_REG_FIFO_DATA,
 851                                       &buffer[i], step);
 852                 if (ret)
 853                         break;
 854         }
 855
 856         if (ret)
 857                 dev_err(data->dev, "Error transferring data from fifo in single steps of %zu\n",
 858                         step);
 859
 860         return ret;
 861 }
 862
 863 static int __bmc150_accel_fifo_flush(struct iio_dev *indio_dev,
 864                                      unsigned samples, bool irq)
 865 {
 866         struct bmc150_accel_data *data = iio_priv(indio_dev);
 867         int ret, i;
 868         u8 count;
 869         u16 buffer[BMC150_ACCEL_FIFO_LENGTH * 3];
 870         int64_t tstamp;
 871         uint64_t sample_period;
 872         unsigned int val;
 873
 874         ret = regmap_read(data->regmap, BMC150_ACCEL_REG_FIFO_STATUS, &val);
 875         if (ret < 0) {
 876                 dev_err(data->dev, "Error reading reg_fifo_status\n");
 877                 return ret;
 878         }
 879
 880         count = val & 0x7F;
 881
 882         if (!count)
 883                 return 0;
 884
 885         /*
 886          * If we getting called from IRQ handler we know the stored timestamp is
 887          * fairly accurate for the last stored sample. Otherwise, if we are
 888          * called as a result of a read operation from userspace and hence
 889          * before the watermark interrupt was triggered, take a timestamp
 890          * now. We can fall anywhere in between two samples so the error in this
 891          * case is at most one sample period.
 892          */
 893         if (!irq) {
 894                 data->old_timestamp = data->timestamp;
 895                 data->timestamp = iio_get_time_ns();
 896         }
 897
 898         /*
 899          * Approximate timestamps for each of the sample based on the sampling
 900          * frequency, timestamp for last sample and number of samples.
 901          *
 902          * Note that we can't use the current bandwidth settings to compute the
 903          * sample period because the sample rate varies with the device
 904          * (e.g. between 31.70ms to 32.20ms for a bandwidth of 15.63HZ). That
 905          * small variation adds when we store a large number of samples and
 906          * creates significant jitter between the last and first samples in
 907          * different batches (e.g. 32ms vs 21ms).
 908          *
 909          * To avoid this issue we compute the actual sample period ourselves
 910          * based on the timestamp delta between the last two flush operations.
 911          */
 912         sample_period = (data->timestamp - data->old_timestamp);
 913         do_div(sample_period, count);
 914         tstamp = data->timestamp - (count - 1) * sample_period;
 915
 916         if (samples && count > samples)
 917                 count = samples;
 918
 919         ret = bmc150_accel_fifo_transfer(data, (u8 *)buffer, count);
 920         if (ret)
 921                 return ret;
 922
 923         /*
 924          * Ideally we want the IIO core to handle the demux when running in fifo
 925          * mode but not when running in triggered buffer mode. Unfortunately
 926          * this does not seem to be possible, so stick with driver demux for
 927          * now.
 928          */
 929         for (i = 0; i < count; i++) {
 930                 u16 sample[8];
 931                 int j, bit;
 932
 933                 j = 0;
 934                 for_each_set_bit(bit, indio_dev->active_scan_mask,
 935                                  indio_dev->masklength)
 936                         memcpy(&sample[j++], &buffer[i * 3 + bit], 2);
 937
 938                 iio_push_to_buffers_with_timestamp(indio_dev, sample, tstamp);
 939
 940                 tstamp += sample_period;
 941         }
 942
 943         return count;
 944 }
 945
 946 static int bmc150_accel_fifo_flush(struct iio_dev *indio_dev, unsigned samples)
 947 {
 948         struct bmc150_accel_data *data = iio_priv(indio_dev);
 949         int ret;
 950
 951         mutex_lock(&data->mutex);
 952         ret = __bmc150_accel_fifo_flush(indio_dev, samples, false);
 953         mutex_unlock(&data->mutex);
 954
 955         return ret;
 956 }
 957
 958 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
 959                 "15.620000 31.260000 62.50000 125 250 500 1000 2000");
 960
 961 static struct attribute *bmc150_accel_attributes[] = {
 962         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 963         NULL,
 964 };
 965
 966 static const struct attribute_group bmc150_accel_attrs_group = {
 967         .attrs = bmc150_accel_attributes,
 968 };
 969
 970 static const struct iio_event_spec bmc150_accel_event = {
 971                 .type = IIO_EV_TYPE_ROC,
 972                 .dir = IIO_EV_DIR_EITHER,
 973                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 974                                  BIT(IIO_EV_INFO_ENABLE) |
 975                                  BIT(IIO_EV_INFO_PERIOD)
 976 };
 977
 978 #define BMC150_ACCEL_CHANNEL(_axis, bits) {                             \
 979         .type = IIO_ACCEL,                                              \
 980         .modified = 1,                                                  \
 981         .channel2 = IIO_MOD_##_axis,                                    \
 982         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
 983         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
 984                                 BIT(IIO_CHAN_INFO_SAMP_FREQ),           \
 985         .scan_index = AXIS_##_axis,                                     \
 986         .scan_type = {                                                  \
 987                 .sign = 's',                                            \
 988                 .realbits = (bits),                                     \
 989                 .storagebits = 16,                                      \
 990                 .shift = 16 - (bits),                                   \
 991         },                                                              \
 992         .event_spec = &bmc150_accel_event,                              \
 993         .num_event_specs = 1                                            \
 994 }
 995
 996 #define BMC150_ACCEL_CHANNELS(bits) {                                   \
 997         {                                                               \
 998                 .type = IIO_TEMP,                                       \
 999                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
1000                                       BIT(IIO_CHAN_INFO_SCALE) |        \
1001                                       BIT(IIO_CHAN_INFO_OFFSET),        \
1002                 .scan_index = -1,                                       \
1003         },                                                              \
1004         BMC150_ACCEL_CHANNEL(X, bits),                                  \
1005         BMC150_ACCEL_CHANNEL(Y, bits),                                  \
1006         BMC150_ACCEL_CHANNEL(Z, bits),                                  \
1007         IIO_CHAN_SOFT_TIMESTAMP(3),                                     \
1008 }
1009
1010 static const struct iio_chan_spec bma222e_accel_channels[] =
1011         BMC150_ACCEL_CHANNELS(8);
1012 static const struct iio_chan_spec bma250e_accel_channels[] =
1013         BMC150_ACCEL_CHANNELS(10);
1014 static const struct iio_chan_spec bmc150_accel_channels[] =
1015         BMC150_ACCEL_CHANNELS(12);
1016 static const struct iio_chan_spec bma280_accel_channels[] =
1017         BMC150_ACCEL_CHANNELS(14);
1018
1019 static const struct bmc150_accel_chip_info bmc150_accel_chip_info_tbl[] = {
1020         [bmc150] = {
1021                 .name = "BMC150A",
1022                 .chip_id = 0xFA,
1023                 .channels = bmc150_accel_channels,
1024                 .num_channels = ARRAY_SIZE(bmc150_accel_channels),
1025                 .scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
1026                                  {19122, BMC150_ACCEL_DEF_RANGE_4G},
1027                                  {38344, BMC150_ACCEL_DEF_RANGE_8G},
1028                                  {76590, BMC150_ACCEL_DEF_RANGE_16G} },
1029         },
1030         [bmi055] = {
1031                 .name = "BMI055A",
1032                 .chip_id = 0xFA,
1033                 .channels = bmc150_accel_channels,
1034                 .num_channels = ARRAY_SIZE(bmc150_accel_channels),
1035                 .scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
1036                                  {19122, BMC150_ACCEL_DEF_RANGE_4G},
1037                                  {38344, BMC150_ACCEL_DEF_RANGE_8G},
1038                                  {76590, BMC150_ACCEL_DEF_RANGE_16G} },
1039         },
1040         [bma255] = {
1041                 .name = "BMA0255",
1042                 .chip_id = 0xFA,
1043                 .channels = bmc150_accel_channels,
1044                 .num_channels = ARRAY_SIZE(bmc150_accel_channels),
1045                 .scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
1046                                  {19122, BMC150_ACCEL_DEF_RANGE_4G},
1047                                  {38344, BMC150_ACCEL_DEF_RANGE_8G},
1048                                  {76590, BMC150_ACCEL_DEF_RANGE_16G} },
1049         },
1050         [bma250e] = {
1051                 .name = "BMA250E",
1052                 .chip_id = 0xF9,
1053                 .channels = bma250e_accel_channels,
1054                 .num_channels = ARRAY_SIZE(bma250e_accel_channels),
1055                 .scale_table = { {38344, BMC150_ACCEL_DEF_RANGE_2G},
1056                                  {76590, BMC150_ACCEL_DEF_RANGE_4G},
1057                                  {153277, BMC150_ACCEL_DEF_RANGE_8G},
1058                                  {306457, BMC150_ACCEL_DEF_RANGE_16G} },
1059         },
1060         [bma222e] = {
1061                 .name = "BMA222E",
1062                 .chip_id = 0xF8,
1063                 .channels = bma222e_accel_channels,
1064                 .num_channels = ARRAY_SIZE(bma222e_accel_channels),
1065                 .scale_table = { {153277, BMC150_ACCEL_DEF_RANGE_2G},
1066                                  {306457, BMC150_ACCEL_DEF_RANGE_4G},
1067                                  {612915, BMC150_ACCEL_DEF_RANGE_8G},
1068                                  {1225831, BMC150_ACCEL_DEF_RANGE_16G} },
1069         },
1070         [bma280] = {
1071                 .name = "BMA0280",
1072                 .chip_id = 0xFB,
1073                 .channels = bma280_accel_channels,
1074                 .num_channels = ARRAY_SIZE(bma280_accel_channels),
1075                 .scale_table = { {2392, BMC150_ACCEL_DEF_RANGE_2G},
1076                                  {4785, BMC150_ACCEL_DEF_RANGE_4G},
1077                                  {9581, BMC150_ACCEL_DEF_RANGE_8G},
1078                                  {19152, BMC150_ACCEL_DEF_RANGE_16G} },
1079         },
1080 };
1081
1082 static const struct iio_info bmc150_accel_info = {
1083         .attrs                  = &bmc150_accel_attrs_group,
1084         .read_raw               = bmc150_accel_read_raw,
1085         .write_raw              = bmc150_accel_write_raw,
1086         .read_event_value       = bmc150_accel_read_event,
1087         .write_event_value      = bmc150_accel_write_event,
1088         .write_event_config     = bmc150_accel_write_event_config,
1089         .read_event_config      = bmc150_accel_read_event_config,
1090         .driver_module          = THIS_MODULE,
1091 };
1092
1093 static const struct iio_info bmc150_accel_info_fifo = {
1094         .attrs                  = &bmc150_accel_attrs_group,
1095         .read_raw               = bmc150_accel_read_raw,
1096         .write_raw              = bmc150_accel_write_raw,
1097         .read_event_value       = bmc150_accel_read_event,
1098         .write_event_value      = bmc150_accel_write_event,
1099         .write_event_config     = bmc150_accel_write_event_config,
1100         .read_event_config      = bmc150_accel_read_event_config,
1101         .validate_trigger       = bmc150_accel_validate_trigger,
1102         .hwfifo_set_watermark   = bmc150_accel_set_watermark,
1103         .hwfifo_flush_to_buffer = bmc150_accel_fifo_flush,
1104         .driver_module          = THIS_MODULE,
1105 };
1106
1107 static irqreturn_t bmc150_accel_trigger_handler(int irq, void *p)
1108 {
1109         struct iio_poll_func *pf = p;
1110         struct iio_dev *indio_dev = pf->indio_dev;
1111         struct bmc150_accel_data *data = iio_priv(indio_dev);
1112         int bit, ret, i = 0;
1113         unsigned int raw_val;
1114
1115         mutex_lock(&data->mutex);
1116         for_each_set_bit(bit, indio_dev->active_scan_mask,
1117                          indio_dev->masklength) {
1118                 ret = regmap_bulk_read(data->regmap,
1119                                        BMC150_ACCEL_AXIS_TO_REG(bit), &raw_val,
1120                                        2);
1121                 if (ret < 0) {
1122                         mutex_unlock(&data->mutex);
1123                         goto err_read;
1124                 }
1125                 data->buffer[i++] = raw_val;
1126         }
1127         mutex_unlock(&data->mutex);
1128
1129         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
1130                                            pf->timestamp);
1131 err_read:
1132         iio_trigger_notify_done(indio_dev->trig);
1133
1134         return IRQ_HANDLED;
1135 }
1136
1137 static int bmc150_accel_trig_try_reen(struct iio_trigger *trig)
1138 {
1139         struct bmc150_accel_trigger *t = iio_trigger_get_drvdata(trig);
1140         struct bmc150_accel_data *data = t->data;
1141         int ret;
1142
1143         /* new data interrupts don't need ack */
1144         if (t == &t->data->triggers[BMC150_ACCEL_TRIGGER_DATA_READY])
1145                 return 0;
1146
1147         mutex_lock(&data->mutex);
1148         /* clear any latched interrupt */
1149         ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
1150                            BMC150_ACCEL_INT_MODE_LATCH_INT |
1151                            BMC150_ACCEL_INT_MODE_LATCH_RESET);
1152         mutex_unlock(&data->mutex);
1153         if (ret < 0) {
1154                 dev_err(data->dev,
1155                         "Error writing reg_int_rst_latch\n");
1156                 return ret;
1157         }
1158
1159         return 0;
1160 }
1161
1162 static int bmc150_accel_trigger_set_state(struct iio_trigger *trig,
1163                                           bool state)
1164 {
1165         struct bmc150_accel_trigger *t = iio_trigger_get_drvdata(trig);
1166         struct bmc150_accel_data *data = t->data;
1167         int ret;
1168
1169         mutex_lock(&data->mutex);
1170
1171         if (t->enabled == state) {
1172                 mutex_unlock(&data->mutex);
1173                 return 0;
1174         }
1175
1176         if (t->setup) {
1177                 ret = t->setup(t, state);
1178                 if (ret < 0) {
1179                         mutex_unlock(&data->mutex);
1180                         return ret;
1181                 }
1182         }
1183
1184         ret = bmc150_accel_set_interrupt(data, t->intr, state);
1185         if (ret < 0) {
1186                 mutex_unlock(&data->mutex);
1187                 return ret;
1188         }
1189
1190         t->enabled = state;
1191
1192         mutex_unlock(&data->mutex);
1193
1194         return ret;
1195 }
1196
1197 static const struct iio_trigger_ops bmc150_accel_trigger_ops = {
1198         .set_trigger_state = bmc150_accel_trigger_set_state,
1199         .try_reenable = bmc150_accel_trig_try_reen,
1200         .owner = THIS_MODULE,
1201 };
1202
1203 static int bmc150_accel_handle_roc_event(struct iio_dev *indio_dev)
1204 {
1205         struct bmc150_accel_data *data = iio_priv(indio_dev);
1206         int dir;
1207         int ret;
1208         unsigned int val;
1209
1210         ret = regmap_read(data->regmap, BMC150_ACCEL_REG_INT_STATUS_2, &val);
1211         if (ret < 0) {
1212                 dev_err(data->dev, "Error reading reg_int_status_2\n");
1213                 return ret;
1214         }
1215
1216         if (val & BMC150_ACCEL_ANY_MOTION_BIT_SIGN)
1217                 dir = IIO_EV_DIR_FALLING;
1218         else
1219                 dir = IIO_EV_DIR_RISING;
1220
1221         if (val & BMC150_ACCEL_ANY_MOTION_BIT_X)
1222                 iio_push_event(indio_dev,
1223                                IIO_MOD_EVENT_CODE(IIO_ACCEL,
1224                                                   0,
1225                                                   IIO_MOD_X,
1226                                                   IIO_EV_TYPE_ROC,
1227                                                   dir),
1228                                data->timestamp);
1229
1230         if (val & BMC150_ACCEL_ANY_MOTION_BIT_Y)
1231                 iio_push_event(indio_dev,
1232                                IIO_MOD_EVENT_CODE(IIO_ACCEL,
1233                                                   0,
1234                                                   IIO_MOD_Y,
1235                                                   IIO_EV_TYPE_ROC,
1236                                                   dir),
1237                                data->timestamp);
1238
1239         if (val & BMC150_ACCEL_ANY_MOTION_BIT_Z)
1240                 iio_push_event(indio_dev,
1241                                IIO_MOD_EVENT_CODE(IIO_ACCEL,
1242                                                   0,
1243                                                   IIO_MOD_Z,
1244                                                   IIO_EV_TYPE_ROC,
1245                                                   dir),
1246                                data->timestamp);
1247
1248         return ret;
1249 }
1250
1251 static irqreturn_t bmc150_accel_irq_thread_handler(int irq, void *private)
1252 {
1253         struct iio_dev *indio_dev = private;
1254         struct bmc150_accel_data *data = iio_priv(indio_dev);
1255         bool ack = false;
1256         int ret;
1257
1258         mutex_lock(&data->mutex);
1259
1260         if (data->fifo_mode) {
1261                 ret = __bmc150_accel_fifo_flush(indio_dev,
1262                                                 BMC150_ACCEL_FIFO_LENGTH, true);
1263                 if (ret > 0)
1264                         ack = true;
1265         }
1266
1267         if (data->ev_enable_state) {
1268                 ret = bmc150_accel_handle_roc_event(indio_dev);
1269                 if (ret > 0)
1270                         ack = true;
1271         }
1272
1273         if (ack) {
1274                 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
1275                                    BMC150_ACCEL_INT_MODE_LATCH_INT |
1276                                    BMC150_ACCEL_INT_MODE_LATCH_RESET);
1277                 if (ret)
1278                         dev_err(data->dev, "Error writing reg_int_rst_latch\n");
1279
1280                 ret = IRQ_HANDLED;
1281         } else {
1282                 ret = IRQ_NONE;
1283         }
1284
1285         mutex_unlock(&data->mutex);
1286
1287         return ret;
1288 }
1289
1290 static irqreturn_t bmc150_accel_irq_handler(int irq, void *private)
1291 {
1292         struct iio_dev *indio_dev = private;
1293         struct bmc150_accel_data *data = iio_priv(indio_dev);
1294         bool ack = false;
1295         int i;
1296
1297         data->old_timestamp = data->timestamp;
1298         data->timestamp = iio_get_time_ns();
1299
1300         for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) {
1301                 if (data->triggers[i].enabled) {
1302                         iio_trigger_poll(data->triggers[i].indio_trig);
1303                         ack = true;
1304                         break;
1305                 }
1306         }
1307
1308         if (data->ev_enable_state || data->fifo_mode)
1309                 return IRQ_WAKE_THREAD;
1310
1311         if (ack)
1312                 return IRQ_HANDLED;
1313
1314         return IRQ_NONE;
1315 }
1316
1317 static const struct {
1318         int intr;
1319         const char *name;
1320         int (*setup)(struct bmc150_accel_trigger *t, bool state);
1321 } bmc150_accel_triggers[BMC150_ACCEL_TRIGGERS] = {
1322         {
1323                 .intr = 0,
1324                 .name = "%s-dev%d",
1325         },
1326         {
1327                 .intr = 1,
1328                 .name = "%s-any-motion-dev%d",
1329                 .setup = bmc150_accel_any_motion_setup,
1330         },
1331 };
1332
1333 static void bmc150_accel_unregister_triggers(struct bmc150_accel_data *data,
1334                                              int from)
1335 {
1336         int i;
1337
1338         for (i = from; i >= 0; i--) {
1339                 if (data->triggers[i].indio_trig) {
1340                         iio_trigger_unregister(data->triggers[i].indio_trig);
1341                         data->triggers[i].indio_trig = NULL;
1342                 }
1343         }
1344 }
1345
1346 static int bmc150_accel_triggers_setup(struct iio_dev *indio_dev,
1347                                        struct bmc150_accel_data *data)
1348 {
1349         int i, ret;
1350
1351         for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) {
1352                 struct bmc150_accel_trigger *t = &data->triggers[i];
1353
1354                 t->indio_trig = devm_iio_trigger_alloc(data->dev,
1355                                                bmc150_accel_triggers[i].name,
1356                                                        indio_dev->name,
1357                                                        indio_dev->id);
1358                 if (!t->indio_trig) {
1359                         ret = -ENOMEM;
1360                         break;
1361                 }
1362
1363                 t->indio_trig->dev.parent = data->dev;
1364                 t->indio_trig->ops = &bmc150_accel_trigger_ops;
1365                 t->intr = bmc150_accel_triggers[i].intr;
1366                 t->data = data;
1367                 t->setup = bmc150_accel_triggers[i].setup;
1368                 iio_trigger_set_drvdata(t->indio_trig, t);
1369
1370                 ret = iio_trigger_register(t->indio_trig);
1371                 if (ret)
1372                         break;
1373         }
1374
1375         if (ret)
1376                 bmc150_accel_unregister_triggers(data, i - 1);
1377
1378         return ret;
1379 }
1380
1381 #define BMC150_ACCEL_FIFO_MODE_STREAM          0x80
1382 #define BMC150_ACCEL_FIFO_MODE_FIFO            0x40
1383 #define BMC150_ACCEL_FIFO_MODE_BYPASS          0x00
1384
1385 static int bmc150_accel_fifo_set_mode(struct bmc150_accel_data *data)
1386 {
1387         u8 reg = BMC150_ACCEL_REG_FIFO_CONFIG1;
1388         int ret;
1389
1390         ret = regmap_write(data->regmap, reg, data->fifo_mode);
1391         if (ret < 0) {
1392                 dev_err(data->dev, "Error writing reg_fifo_config1\n");
1393                 return ret;
1394         }
1395
1396         if (!data->fifo_mode)
1397                 return 0;
1398
1399         ret = regmap_write(data->regmap, BMC150_ACCEL_REG_FIFO_CONFIG0,
1400                            data->watermark);
1401         if (ret < 0)
1402                 dev_err(data->dev, "Error writing reg_fifo_config0\n");
1403
1404         return ret;
1405 }
1406
1407 static int bmc150_accel_buffer_preenable(struct iio_dev *indio_dev)
1408 {
1409         struct bmc150_accel_data *data = iio_priv(indio_dev);
1410
1411         return bmc150_accel_set_power_state(data, true);
1412 }
1413
1414 static int bmc150_accel_buffer_postenable(struct iio_dev *indio_dev)
1415 {
1416         struct bmc150_accel_data *data = iio_priv(indio_dev);
1417         int ret = 0;
1418
1419         if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED)
1420                 return iio_triggered_buffer_postenable(indio_dev);
1421
1422         mutex_lock(&data->mutex);
1423
1424         if (!data->watermark)
1425                 goto out;
1426
1427         ret = bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK,
1428                                          true);
1429         if (ret)
1430                 goto out;
1431
1432         data->fifo_mode = BMC150_ACCEL_FIFO_MODE_FIFO;
1433
1434         ret = bmc150_accel_fifo_set_mode(data);
1435         if (ret) {
1436                 data->fifo_mode = 0;
1437                 bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK,
1438                                            false);
1439         }
1440
1441 out:
1442         mutex_unlock(&data->mutex);
1443
1444         return ret;
1445 }
1446
1447 static int bmc150_accel_buffer_predisable(struct iio_dev *indio_dev)
1448 {
1449         struct bmc150_accel_data *data = iio_priv(indio_dev);
1450
1451         if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED)
1452                 return iio_triggered_buffer_predisable(indio_dev);
1453
1454         mutex_lock(&data->mutex);
1455
1456         if (!data->fifo_mode)
1457                 goto out;
1458
1459         bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK, false);
1460         __bmc150_accel_fifo_flush(indio_dev, BMC150_ACCEL_FIFO_LENGTH, false);
1461         data->fifo_mode = 0;
1462         bmc150_accel_fifo_set_mode(data);
1463
1464 out:
1465         mutex_unlock(&data->mutex);
1466
1467         return 0;
1468 }
1469
1470 static int bmc150_accel_buffer_postdisable(struct iio_dev *indio_dev)
1471 {
1472         struct bmc150_accel_data *data = iio_priv(indio_dev);
1473
1474         return bmc150_accel_set_power_state(data, false);
1475 }
1476
1477 static const struct iio_buffer_setup_ops bmc150_accel_buffer_ops = {
1478         .preenable = bmc150_accel_buffer_preenable,
1479         .postenable = bmc150_accel_buffer_postenable,
1480         .predisable = bmc150_accel_buffer_predisable,
1481         .postdisable = bmc150_accel_buffer_postdisable,
1482 };
1483
1484 static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
1485 {
1486         int ret, i;
1487         unsigned int val;
1488
1489         ret = regmap_read(data->regmap, BMC150_ACCEL_REG_CHIP_ID, &val);
1490         if (ret < 0) {
1491                 dev_err(data->dev,
1492                         "Error: Reading chip id\n");
1493                 return ret;
1494         }
1495
1496         dev_dbg(data->dev, "Chip Id %x\n", val);
1497         for (i = 0; i < ARRAY_SIZE(bmc150_accel_chip_info_tbl); i++) {
1498                 if (bmc150_accel_chip_info_tbl[i].chip_id == val) {
1499                         data->chip_info = &bmc150_accel_chip_info_tbl[i];
1500                         break;
1501                 }
1502         }
1503
1504         if (!data->chip_info) {
1505                 dev_err(data->dev, "Invalid chip %x\n", val);
1506                 return -ENODEV;
1507         }
1508
1509         ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
1510         if (ret < 0)
1511                 return ret;
1512
1513         /* Set Bandwidth */
1514         ret = bmc150_accel_set_bw(data, BMC150_ACCEL_DEF_BW, 0);
1515         if (ret < 0)
1516                 return ret;
1517
1518         /* Set Default Range */
1519         ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_RANGE,
1520                            BMC150_ACCEL_DEF_RANGE_4G);
1521         if (ret < 0) {
1522                 dev_err(data->dev,
1523                                         "Error writing reg_pmu_range\n");
1524                 return ret;
1525         }
1526
1527         data->range = BMC150_ACCEL_DEF_RANGE_4G;
1528
1529         /* Set default slope duration and thresholds */
1530         data->slope_thres = BMC150_ACCEL_DEF_SLOPE_THRESHOLD;
1531         data->slope_dur = BMC150_ACCEL_DEF_SLOPE_DURATION;
1532         ret = bmc150_accel_update_slope(data);
1533         if (ret < 0)
1534                 return ret;
1535
1536         /* Set default as latched interrupts */
1537         ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
1538                            BMC150_ACCEL_INT_MODE_LATCH_INT |
1539                            BMC150_ACCEL_INT_MODE_LATCH_RESET);
1540         if (ret < 0) {
1541                 dev_err(data->dev,
1542                         "Error writing reg_int_rst_latch\n");
1543                 return ret;
1544         }
1545
1546         return 0;
1547 }
1548
1549 int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq,
1550                             const char *name, bool block_supported)
1551 {
1552         struct bmc150_accel_data *data;
1553         struct iio_dev *indio_dev;
1554         int ret;
1555
1556         indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
1557         if (!indio_dev)
1558                 return -ENOMEM;
1559
1560         data = iio_priv(indio_dev);
1561         dev_set_drvdata(dev, indio_dev);
1562         data->dev = dev;
1563         data->irq = irq;
1564
1565         data->regmap = regmap;
1566
1567         ret = bmc150_accel_chip_init(data);
1568         if (ret < 0)
1569                 return ret;
1570
1571         mutex_init(&data->mutex);
1572
1573         indio_dev->dev.parent = dev;
1574         indio_dev->channels = data->chip_info->channels;
1575         indio_dev->num_channels = data->chip_info->num_channels;
1576         indio_dev->name = name ? name : data->chip_info->name;
1577         indio_dev->modes = INDIO_DIRECT_MODE;
1578         indio_dev->info = &bmc150_accel_info;
1579
1580         ret = iio_triggered_buffer_setup(indio_dev,
1581                                          &iio_pollfunc_store_time,
1582                                          bmc150_accel_trigger_handler,
1583                                          &bmc150_accel_buffer_ops);
1584         if (ret < 0) {
1585                 dev_err(data->dev, "Failed: iio triggered buffer setup\n");
1586                 return ret;
1587         }
1588
1589         if (data->irq > 0) {
1590                 ret = devm_request_threaded_irq(
1591                                                 data->dev, data->irq,
1592                                                 bmc150_accel_irq_handler,
1593                                                 bmc150_accel_irq_thread_handler,
1594                                                 IRQF_TRIGGER_RISING,
1595                                                 BMC150_ACCEL_IRQ_NAME,
1596                                                 indio_dev);
1597                 if (ret)
1598                         goto err_buffer_cleanup;
1599
1600                 /*
1601                  * Set latched mode interrupt. While certain interrupts are
1602                  * non-latched regardless of this settings (e.g. new data) we
1603                  * want to use latch mode when we can to prevent interrupt
1604                  * flooding.
1605                  */
1606                 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
1607                                    BMC150_ACCEL_INT_MODE_LATCH_RESET);
1608                 if (ret < 0) {
1609                         dev_err(data->dev, "Error writing reg_int_rst_latch\n");
1610                         goto err_buffer_cleanup;
1611                 }
1612
1613                 bmc150_accel_interrupts_setup(indio_dev, data);
1614
1615                 ret = bmc150_accel_triggers_setup(indio_dev, data);
1616                 if (ret)
1617                         goto err_buffer_cleanup;
1618
1619                 if (block_supported) {
1620                         indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
1621                         indio_dev->info = &bmc150_accel_info_fifo;
1622                         indio_dev->buffer->attrs = bmc150_accel_fifo_attributes;
1623                 }
1624         }
1625
1626         ret = iio_device_register(indio_dev);
1627         if (ret < 0) {
1628                 dev_err(dev, "Unable to register iio device\n");
1629                 goto err_trigger_unregister;
1630         }
1631
1632         ret = pm_runtime_set_active(dev);
1633         if (ret)
1634                 goto err_iio_unregister;
1635
1636         pm_runtime_enable(dev);
1637         pm_runtime_set_autosuspend_delay(dev, BMC150_AUTO_SUSPEND_DELAY_MS);
1638         pm_runtime_use_autosuspend(dev);
1639
1640         return 0;
1641
1642 err_iio_unregister:
1643         iio_device_unregister(indio_dev);
1644 err_trigger_unregister:
1645         bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1);
1646 err_buffer_cleanup:
1647         iio_triggered_buffer_cleanup(indio_dev);
1648
1649         return ret;
1650 }
1651 EXPORT_SYMBOL_GPL(bmc150_accel_core_probe);
1652
1653 int bmc150_accel_core_remove(struct device *dev)
1654 {
1655         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1656         struct bmc150_accel_data *data = iio_priv(indio_dev);
1657
1658         pm_runtime_disable(data->dev);
1659         pm_runtime_set_suspended(data->dev);
1660         pm_runtime_put_noidle(data->dev);
1661
1662         iio_device_unregister(indio_dev);
1663
1664         bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1);
1665
1666         iio_triggered_buffer_cleanup(indio_dev);
1667
1668         mutex_lock(&data->mutex);
1669         bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND, 0);
1670         mutex_unlock(&data->mutex);
1671
1672         return 0;
1673 }
1674 EXPORT_SYMBOL_GPL(bmc150_accel_core_remove);
1675
1676 #ifdef CONFIG_PM_SLEEP
1677 static int bmc150_accel_suspend(struct device *dev)
1678 {
1679         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1680         struct bmc150_accel_data *data = iio_priv(indio_dev);
1681
1682         mutex_lock(&data->mutex);
1683         bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_SUSPEND, 0);
1684         mutex_unlock(&data->mutex);
1685
1686         return 0;
1687 }
1688
1689 static int bmc150_accel_resume(struct device *dev)
1690 {
1691         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1692         struct bmc150_accel_data *data = iio_priv(indio_dev);
1693
1694         mutex_lock(&data->mutex);
1695         if (atomic_read(&data->active_intr))
1696                 bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
1697         bmc150_accel_fifo_set_mode(data);
1698         mutex_unlock(&data->mutex);
1699
1700         return 0;
1701 }
1702 #endif
1703
1704 #ifdef CONFIG_PM
1705 static int bmc150_accel_runtime_suspend(struct device *dev)
1706 {
1707         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1708         struct bmc150_accel_data *data = iio_priv(indio_dev);
1709         int ret;
1710
1711         dev_dbg(data->dev,  __func__);
1712         ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_SUSPEND, 0);
1713         if (ret < 0)
1714                 return -EAGAIN;
1715
1716         return 0;
1717 }
1718
1719 static int bmc150_accel_runtime_resume(struct device *dev)
1720 {
1721         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1722         struct bmc150_accel_data *data = iio_priv(indio_dev);
1723         int ret;
1724         int sleep_val;
1725
1726         dev_dbg(data->dev,  __func__);
1727
1728         ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
1729         if (ret < 0)
1730                 return ret;
1731         ret = bmc150_accel_fifo_set_mode(data);
1732         if (ret < 0)
1733                 return ret;
1734
1735         sleep_val = bmc150_accel_get_startup_times(data);
1736         if (sleep_val < 20)
1737                 usleep_range(sleep_val * 1000, 20000);
1738         else
1739                 msleep_interruptible(sleep_val);
1740
1741         return 0;
1742 }
1743 #endif
1744
1745 const struct dev_pm_ops bmc150_accel_pm_ops = {
1746         SET_SYSTEM_SLEEP_PM_OPS(bmc150_accel_suspend, bmc150_accel_resume)
1747         SET_RUNTIME_PM_OPS(bmc150_accel_runtime_suspend,
1748                            bmc150_accel_runtime_resume, NULL)
1749 };
1750 EXPORT_SYMBOL_GPL(bmc150_accel_pm_ops);
1751
1752 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
1753 MODULE_LICENSE("GPL v2");
1754 MODULE_DESCRIPTION("BMC150 accelerometer driver");