drivers/iio/proximity/sx9324.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2021 Google LLC.
   4  *
   5  * Driver for Semtech's SX9324 capacitive proximity/button solution.
   6  * Based on SX9324 driver and copy of datasheet at:
   7  * https://edit.wpgdadawant.com/uploads/news_file/program/2019/30184/tech_files/program_30184_suggest_other_file.pdf
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/bits.h>
  12 #include <linux/bitfield.h>
  13 #include <linux/delay.h>
  14 #include <linux/i2c.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/kernel.h>
  17 #include <linux/log2.h>
  18 #include <linux/mod_devicetable.h>
  19 #include <linux/module.h>
  20 #include <linux/pm.h>
  21 #include <linux/property.h>
  22 #include <linux/regmap.h>
  23
  24 #include <linux/iio/iio.h>
  25
  26 #include "sx_common.h"
  27
  28 /* Register definitions. */
  29 #define SX9324_REG_IRQ_SRC              SX_COMMON_REG_IRQ_SRC
  30 #define SX9324_REG_STAT0                0x01
  31 #define SX9324_REG_STAT1                0x02
  32 #define SX9324_REG_STAT2                0x03
  33 #define SX9324_REG_STAT2_COMPSTAT_MASK  GENMASK(3, 0)
  34 #define SX9324_REG_STAT3                0x04
  35 #define SX9324_REG_IRQ_MSK              0x05
  36 #define SX9324_CONVDONE_IRQ             BIT(3)
  37 #define SX9324_FAR_IRQ                  BIT(5)
  38 #define SX9324_CLOSE_IRQ                BIT(6)
  39 #define SX9324_REG_IRQ_CFG0             0x06
  40 #define SX9324_REG_IRQ_CFG1             0x07
  41 #define SX9324_REG_IRQ_CFG1_FAILCOND    0x80
  42 #define SX9324_REG_IRQ_CFG2             0x08
  43
  44 #define SX9324_REG_GNRL_CTRL0           0x10
  45 #define SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK GENMASK(4, 0)
  46 #define SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS 0x16
  47 #define SX9324_REG_GNRL_CTRL1           0x11
  48 #define SX9324_REG_GNRL_CTRL1_PHEN_MASK GENMASK(3, 0)
  49 #define SX9324_REG_GNRL_CTRL1_PAUSECTRL 0x20
  50
  51 #define SX9324_REG_I2C_ADDR             0x14
  52 #define SX9324_REG_CLK_SPRD             0x15
  53
  54 #define SX9324_REG_AFE_CTRL0            0x20
  55 #define SX9324_REG_AFE_CTRL0_RINT_SHIFT         6
  56 #define SX9324_REG_AFE_CTRL0_RINT_MASK \
  57         GENMASK(SX9324_REG_AFE_CTRL0_RINT_SHIFT + 1, \
  58                 SX9324_REG_AFE_CTRL0_RINT_SHIFT)
  59 #define SX9324_REG_AFE_CTRL0_RINT_LOWEST        0x00
  60 #define SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT       4
  61 #define SX9324_REG_AFE_CTRL0_CSIDLE_MASK \
  62         GENMASK(SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT + 1, \
  63                 SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT)
  64 #define SX9324_REG_AFE_CTRL0_RINT_LOWEST        0x00
  65 #define SX9324_REG_AFE_CTRL1            0x21
  66 #define SX9324_REG_AFE_CTRL2            0x22
  67 #define SX9324_REG_AFE_CTRL3            0x23
  68 #define SX9324_REG_AFE_CTRL4            0x24
  69 #define SX9324_REG_AFE_CTRL4_FREQ_83_33HZ 0x40
  70 #define SX9324_REG_AFE_CTRL4_RESOLUTION_MASK GENMASK(2, 0)
  71 #define SX9324_REG_AFE_CTRL4_RES_100    0x04
  72 #define SX9324_REG_AFE_CTRL5            0x25
  73 #define SX9324_REG_AFE_CTRL6            0x26
  74 #define SX9324_REG_AFE_CTRL7            0x27
  75 #define SX9324_REG_AFE_PH0              0x28
  76 #define SX9324_REG_AFE_PH0_PIN_MASK(_pin) \
  77         GENMASK(2 * (_pin) + 1, 2 * (_pin))
  78
  79 #define SX9324_REG_AFE_PH1              0x29
  80 #define SX9324_REG_AFE_PH2              0x2a
  81 #define SX9324_REG_AFE_PH3              0x2b
  82 #define SX9324_REG_AFE_CTRL8            0x2c
  83 #define SX9324_REG_AFE_CTRL8_RESERVED   0x10
  84 #define SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM 0x02
  85 #define SX9324_REG_AFE_CTRL8_RESFILTIN_MASK GENMASK(3, 0)
  86 #define SX9324_REG_AFE_CTRL9            0x2d
  87 #define SX9324_REG_AFE_CTRL9_AGAIN_MASK                 GENMASK(3, 0)
  88 #define SX9324_REG_AFE_CTRL9_AGAIN_1    0x08
  89
  90 #define SX9324_REG_PROX_CTRL0           0x30
  91 #define SX9324_REG_PROX_CTRL0_GAIN_MASK GENMASK(5, 3)
  92 #define SX9324_REG_PROX_CTRL0_GAIN_SHIFT        3
  93 #define SX9324_REG_PROX_CTRL0_GAIN_RSVD         0x0
  94 #define SX9324_REG_PROX_CTRL0_GAIN_1            0x1
  95 #define SX9324_REG_PROX_CTRL0_GAIN_8            0x4
  96 #define SX9324_REG_PROX_CTRL0_RAWFILT_MASK      GENMASK(2, 0)
  97 #define SX9324_REG_PROX_CTRL0_RAWFILT_1P50      0x01
  98 #define SX9324_REG_PROX_CTRL1           0x31
  99 #define SX9324_REG_PROX_CTRL2           0x32
 100 #define SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K 0x20
 101 #define SX9324_REG_PROX_CTRL3           0x33
 102 #define SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES   0x40
 103 #define SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K 0x20
 104 #define SX9324_REG_PROX_CTRL4           0x34
 105 #define SX9324_REG_PROX_CTRL4_AVGNEGFILT_MASK   GENMASK(5, 3)
 106 #define SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 0x08
 107 #define SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK   GENMASK(2, 0)
 108 #define SX9324_REG_PROX_CTRL4_AVGPOS_FILT_256 0x04
 109 #define SX9324_REG_PROX_CTRL5           0x35
 110 #define SX9324_REG_PROX_CTRL5_HYST_MASK                 GENMASK(5, 4)
 111 #define SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK       GENMASK(3, 2)
 112 #define SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK         GENMASK(1, 0)
 113 #define SX9324_REG_PROX_CTRL6           0x36
 114 #define SX9324_REG_PROX_CTRL6_PROXTHRESH_32     0x08
 115 #define SX9324_REG_PROX_CTRL7           0x37
 116
 117 #define SX9324_REG_ADV_CTRL0            0x40
 118 #define SX9324_REG_ADV_CTRL1            0x41
 119 #define SX9324_REG_ADV_CTRL2            0x42
 120 #define SX9324_REG_ADV_CTRL3            0x43
 121 #define SX9324_REG_ADV_CTRL4            0x44
 122 #define SX9324_REG_ADV_CTRL5            0x45
 123 #define SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK GENMASK(3, 2)
 124 #define SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1   0x04
 125 #define SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1   0x01
 126 #define SX9324_REG_ADV_CTRL6            0x46
 127 #define SX9324_REG_ADV_CTRL7            0x47
 128 #define SX9324_REG_ADV_CTRL8            0x48
 129 #define SX9324_REG_ADV_CTRL9            0x49
 130 #define SX9324_REG_ADV_CTRL10           0x4a
 131 #define SX9324_REG_ADV_CTRL11           0x4b
 132 #define SX9324_REG_ADV_CTRL12           0x4c
 133 #define SX9324_REG_ADV_CTRL13           0x4d
 134 #define SX9324_REG_ADV_CTRL14           0x4e
 135 #define SX9324_REG_ADV_CTRL15           0x4f
 136 #define SX9324_REG_ADV_CTRL16           0x50
 137 #define SX9324_REG_ADV_CTRL17           0x51
 138 #define SX9324_REG_ADV_CTRL18           0x52
 139 #define SX9324_REG_ADV_CTRL19           0x53
 140 #define SX9324_REG_ADV_CTRL20           0x54
 141 #define SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION 0xf0
 142
 143 #define SX9324_REG_PHASE_SEL            0x60
 144
 145 #define SX9324_REG_USEFUL_MSB           0x61
 146 #define SX9324_REG_USEFUL_LSB           0x62
 147
 148 #define SX9324_REG_AVG_MSB              0x63
 149 #define SX9324_REG_AVG_LSB              0x64
 150
 151 #define SX9324_REG_DIFF_MSB             0x65
 152 #define SX9324_REG_DIFF_LSB             0x66
 153
 154 #define SX9324_REG_OFFSET_MSB           0x67
 155 #define SX9324_REG_OFFSET_LSB           0x68
 156
 157 #define SX9324_REG_SAR_MSB              0x69
 158 #define SX9324_REG_SAR_LSB              0x6a
 159
 160 #define SX9324_REG_RESET                0x9f
 161 /* Write this to REG_RESET to do a soft reset. */
 162 #define SX9324_SOFT_RESET               0xde
 163
 164 #define SX9324_REG_WHOAMI               0xfa
 165 #define   SX9324_WHOAMI_VALUE           0x23
 166
 167 #define SX9324_REG_REVISION             0xfe
 168
 169 /* 4 channels, as defined in STAT0: PH0, PH1, PH2 and PH3. */
 170 #define SX9324_NUM_CHANNELS             4
 171 /* 3 CS pins: CS0, CS1, CS2. */
 172 #define SX9324_NUM_PINS                 3
 173
 174 static const char * const sx9324_cs_pin_usage[] = { "HZ", "MI", "DS", "GD" };
 175
 176 static ssize_t sx9324_phase_configuration_show(struct iio_dev *indio_dev,
 177                                                uintptr_t private,
 178                                                const struct iio_chan_spec *chan,
 179                                                char *buf)
 180 {
 181         struct sx_common_data *data = iio_priv(indio_dev);
 182         unsigned int val;
 183         int i, ret, pin_idx;
 184         size_t len = 0;
 185
 186         ret = regmap_read(data->regmap, SX9324_REG_AFE_PH0 + chan->channel, &val);
 187         if (ret < 0)
 188                 return ret;
 189
 190         for (i = 0; i < SX9324_NUM_PINS; i++) {
 191                 pin_idx = (val & SX9324_REG_AFE_PH0_PIN_MASK(i)) >> (2 * i);
 192                 len += sysfs_emit_at(buf, len, "%s,",
 193                                      sx9324_cs_pin_usage[pin_idx]);
 194         }
 195         buf[len - 1] = '\n';
 196         return len;
 197 }
 198
 199 static const struct iio_chan_spec_ext_info sx9324_channel_ext_info[] = {
 200         {
 201                 .name = "setup",
 202                 .shared = IIO_SEPARATE,
 203                 .read = sx9324_phase_configuration_show,
 204         },
 205         {}
 206 };
 207
 208 #define SX9324_CHANNEL(idx)                                      \
 209 {                                                                \
 210         .type = IIO_PROXIMITY,                                   \
 211         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |           \
 212                               BIT(IIO_CHAN_INFO_HARDWAREGAIN),   \
 213         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 214         .info_mask_separate_available =                          \
 215                 BIT(IIO_CHAN_INFO_HARDWAREGAIN),                 \
 216         .info_mask_shared_by_all_available =                     \
 217                 BIT(IIO_CHAN_INFO_SAMP_FREQ),                    \
 218         .indexed = 1,                                            \
 219         .channel = idx,                                          \
 220         .address = SX9324_REG_DIFF_MSB,                          \
 221         .event_spec = sx_common_events,                          \
 222         .num_event_specs = ARRAY_SIZE(sx_common_events),         \
 223         .scan_index = idx,                                       \
 224         .scan_type = {                                           \
 225                 .sign = 's',                                     \
 226                 .realbits = 12,                                  \
 227                 .storagebits = 16,                               \
 228                 .endianness = IIO_BE,                            \
 229         },                                                       \
 230         .ext_info = sx9324_channel_ext_info,                     \
 231 }
 232
 233 static const struct iio_chan_spec sx9324_channels[] = {
 234         SX9324_CHANNEL(0),                      /* Phase 0 */
 235         SX9324_CHANNEL(1),                      /* Phase 1 */
 236         SX9324_CHANNEL(2),                      /* Phase 2 */
 237         SX9324_CHANNEL(3),                      /* Phase 3 */
 238         IIO_CHAN_SOFT_TIMESTAMP(4),
 239 };
 240
 241 /*
 242  * Each entry contains the integer part (val) and the fractional part, in micro
 243  * seconds. It conforms to the IIO output IIO_VAL_INT_PLUS_MICRO.
 244  */
 245 static const struct {
 246         int val;
 247         int val2;
 248 } sx9324_samp_freq_table[] = {
 249         { 1000, 0 },  /* 00000: Min (no idle time) */
 250         { 500, 0 },  /* 00001: 2 ms */
 251         { 250, 0 },  /* 00010: 4 ms */
 252         { 166, 666666 },  /* 00011: 6 ms */
 253         { 125, 0 },  /* 00100: 8 ms */
 254         { 100, 0 },  /* 00101: 10 ms */
 255         { 71, 428571 },  /* 00110: 14 ms */
 256         { 55, 555556 },  /* 00111: 18 ms */
 257         { 45, 454545 },  /* 01000: 22 ms */
 258         { 38, 461538 },  /* 01001: 26 ms */
 259         { 33, 333333 },  /* 01010: 30 ms */
 260         { 29, 411765 },  /* 01011: 34 ms */
 261         { 26, 315789 },  /* 01100: 38 ms */
 262         { 23, 809524 },  /* 01101: 42 ms */
 263         { 21, 739130 },  /* 01110: 46 ms */
 264         { 20, 0 },  /* 01111: 50 ms */
 265         { 17, 857143 },  /* 10000: 56 ms */
 266         { 16, 129032 },  /* 10001: 62 ms */
 267         { 14, 705882 },  /* 10010: 68 ms */
 268         { 13, 513514 },  /* 10011: 74 ms */
 269         { 12, 500000 },  /* 10100: 80 ms */
 270         { 11, 111111 },  /* 10101: 90 ms */
 271         { 10, 0 },  /* 10110: 100 ms (Typ.) */
 272         { 5, 0 },  /* 10111: 200 ms */
 273         { 3, 333333 },  /* 11000: 300 ms */
 274         { 2, 500000 },  /* 11001: 400 ms */
 275         { 1, 666667 },  /* 11010: 600 ms */
 276         { 1, 250000 },  /* 11011: 800 ms */
 277         { 1, 0 },  /* 11100: 1 s */
 278         { 0, 500000 },  /* 11101: 2 s */
 279         { 0, 333333 },  /* 11110: 3 s */
 280         { 0, 250000 },  /* 11111: 4 s */
 281 };
 282
 283 static const unsigned int sx9324_scan_period_table[] = {
 284         2,   15,  30,  45,   60,   90,   120,  200,
 285         400, 600, 800, 1000, 2000, 3000, 4000, 5000,
 286 };
 287
 288 static const struct regmap_range sx9324_writable_reg_ranges[] = {
 289         /*
 290          * To set COMPSTAT for compensation, even if datasheet says register is
 291          * RO.
 292          */
 293         regmap_reg_range(SX9324_REG_STAT2, SX9324_REG_STAT2),
 294         regmap_reg_range(SX9324_REG_IRQ_MSK, SX9324_REG_IRQ_CFG2),
 295         regmap_reg_range(SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL1),
 296         /* Leave i2c and clock spreading as unavailable */
 297         regmap_reg_range(SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL9),
 298         regmap_reg_range(SX9324_REG_PROX_CTRL0, SX9324_REG_PROX_CTRL7),
 299         regmap_reg_range(SX9324_REG_ADV_CTRL0, SX9324_REG_ADV_CTRL20),
 300         regmap_reg_range(SX9324_REG_PHASE_SEL, SX9324_REG_PHASE_SEL),
 301         regmap_reg_range(SX9324_REG_OFFSET_MSB, SX9324_REG_OFFSET_LSB),
 302         regmap_reg_range(SX9324_REG_RESET, SX9324_REG_RESET),
 303 };
 304
 305 static const struct regmap_access_table sx9324_writeable_regs = {
 306         .yes_ranges = sx9324_writable_reg_ranges,
 307         .n_yes_ranges = ARRAY_SIZE(sx9324_writable_reg_ranges),
 308 };
 309
 310 /*
 311  * All allocated registers are readable, so we just list unallocated
 312  * ones.
 313  */
 314 static const struct regmap_range sx9324_non_readable_reg_ranges[] = {
 315         regmap_reg_range(SX9324_REG_IRQ_CFG2 + 1, SX9324_REG_GNRL_CTRL0 - 1),
 316         regmap_reg_range(SX9324_REG_GNRL_CTRL1 + 1, SX9324_REG_AFE_CTRL0 - 1),
 317         regmap_reg_range(SX9324_REG_AFE_CTRL9 + 1, SX9324_REG_PROX_CTRL0 - 1),
 318         regmap_reg_range(SX9324_REG_PROX_CTRL7 + 1, SX9324_REG_ADV_CTRL0 - 1),
 319         regmap_reg_range(SX9324_REG_ADV_CTRL20 + 1, SX9324_REG_PHASE_SEL - 1),
 320         regmap_reg_range(SX9324_REG_SAR_LSB + 1, SX9324_REG_RESET - 1),
 321         regmap_reg_range(SX9324_REG_RESET + 1, SX9324_REG_WHOAMI - 1),
 322         regmap_reg_range(SX9324_REG_WHOAMI + 1, SX9324_REG_REVISION - 1),
 323 };
 324
 325 static const struct regmap_access_table sx9324_readable_regs = {
 326         .no_ranges = sx9324_non_readable_reg_ranges,
 327         .n_no_ranges = ARRAY_SIZE(sx9324_non_readable_reg_ranges),
 328 };
 329
 330 static const struct regmap_range sx9324_volatile_reg_ranges[] = {
 331         regmap_reg_range(SX9324_REG_IRQ_SRC, SX9324_REG_STAT3),
 332         regmap_reg_range(SX9324_REG_USEFUL_MSB, SX9324_REG_DIFF_LSB),
 333         regmap_reg_range(SX9324_REG_SAR_MSB, SX9324_REG_SAR_LSB),
 334         regmap_reg_range(SX9324_REG_WHOAMI, SX9324_REG_WHOAMI),
 335         regmap_reg_range(SX9324_REG_REVISION, SX9324_REG_REVISION),
 336 };
 337
 338 static const struct regmap_access_table sx9324_volatile_regs = {
 339         .yes_ranges = sx9324_volatile_reg_ranges,
 340         .n_yes_ranges = ARRAY_SIZE(sx9324_volatile_reg_ranges),
 341 };
 342
 343 static const struct regmap_config sx9324_regmap_config = {
 344         .reg_bits = 8,
 345         .val_bits = 8,
 346
 347         .max_register = SX9324_REG_REVISION,
 348         .cache_type = REGCACHE_RBTREE,
 349
 350         .wr_table = &sx9324_writeable_regs,
 351         .rd_table = &sx9324_readable_regs,
 352         .volatile_table = &sx9324_volatile_regs,
 353 };
 354
 355 static int sx9324_read_prox_data(struct sx_common_data *data,
 356                                  const struct iio_chan_spec *chan,
 357                                  __be16 *val)
 358 {
 359         int ret;
 360
 361         ret = regmap_write(data->regmap, SX9324_REG_PHASE_SEL, chan->channel);
 362         if (ret < 0)
 363                 return ret;
 364
 365         return regmap_bulk_read(data->regmap, chan->address, val, sizeof(*val));
 366 }
 367
 368 /*
 369  * If we have no interrupt support, we have to wait for a scan period
 370  * after enabling a channel to get a result.
 371  */
 372 static int sx9324_wait_for_sample(struct sx_common_data *data)
 373 {
 374         int ret;
 375         unsigned int val;
 376
 377         ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL0, &val);
 378         if (ret < 0)
 379                 return ret;
 380         val = FIELD_GET(SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, val);
 381
 382         msleep(sx9324_scan_period_table[val]);
 383
 384         return 0;
 385 }
 386
 387 static int sx9324_read_gain(struct sx_common_data *data,
 388                             const struct iio_chan_spec *chan, int *val)
 389 {
 390         unsigned int reg, regval;
 391         int ret;
 392
 393         reg = SX9324_REG_PROX_CTRL0 + chan->channel / 2;
 394         ret = regmap_read(data->regmap, reg, &regval);
 395         if (ret)
 396                 return ret;
 397
 398         regval = FIELD_GET(SX9324_REG_PROX_CTRL0_GAIN_MASK, regval);
 399         if (regval)
 400                 regval--;
 401         else if (regval == SX9324_REG_PROX_CTRL0_GAIN_RSVD ||
 402                  regval > SX9324_REG_PROX_CTRL0_GAIN_8)
 403                 return -EINVAL;
 404
 405         *val = 1 << regval;
 406
 407         return IIO_VAL_INT;
 408 }
 409
 410 static int sx9324_read_samp_freq(struct sx_common_data *data,
 411                                  int *val, int *val2)
 412 {
 413         int ret;
 414         unsigned int regval;
 415
 416         ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL0, &regval);
 417         if (ret)
 418                 return ret;
 419
 420         regval = FIELD_GET(SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, regval);
 421         *val = sx9324_samp_freq_table[regval].val;
 422         *val2 = sx9324_samp_freq_table[regval].val2;
 423
 424         return IIO_VAL_INT_PLUS_MICRO;
 425 }
 426
 427 static int sx9324_read_raw(struct iio_dev *indio_dev,
 428                            const struct iio_chan_spec *chan,
 429                            int *val, int *val2, long mask)
 430 {
 431         struct sx_common_data *data = iio_priv(indio_dev);
 432         int ret;
 433
 434         switch (mask) {
 435         case IIO_CHAN_INFO_RAW:
 436                 ret = iio_device_claim_direct_mode(indio_dev);
 437                 if (ret)
 438                         return ret;
 439
 440                 ret = sx_common_read_proximity(data, chan, val);
 441                 iio_device_release_direct_mode(indio_dev);
 442                 return ret;
 443         case IIO_CHAN_INFO_HARDWAREGAIN:
 444                 ret = iio_device_claim_direct_mode(indio_dev);
 445                 if (ret)
 446                         return ret;
 447
 448                 ret = sx9324_read_gain(data, chan, val);
 449                 iio_device_release_direct_mode(indio_dev);
 450                 return ret;
 451         case IIO_CHAN_INFO_SAMP_FREQ:
 452                 return sx9324_read_samp_freq(data, val, val2);
 453         default:
 454                 return -EINVAL;
 455         }
 456 }
 457
 458 static const int sx9324_gain_vals[] = { 1, 2, 4, 8 };
 459
 460 static int sx9324_read_avail(struct iio_dev *indio_dev,
 461                              struct iio_chan_spec const *chan,
 462                              const int **vals, int *type, int *length,
 463                              long mask)
 464 {
 465         if (chan->type != IIO_PROXIMITY)
 466                 return -EINVAL;
 467
 468         switch (mask) {
 469         case IIO_CHAN_INFO_HARDWAREGAIN:
 470                 *type = IIO_VAL_INT;
 471                 *length = ARRAY_SIZE(sx9324_gain_vals);
 472                 *vals = sx9324_gain_vals;
 473                 return IIO_AVAIL_LIST;
 474         case IIO_CHAN_INFO_SAMP_FREQ:
 475                 *type = IIO_VAL_INT_PLUS_MICRO;
 476                 *length = ARRAY_SIZE(sx9324_samp_freq_table) * 2;
 477                 *vals = (int *)sx9324_samp_freq_table;
 478                 return IIO_AVAIL_LIST;
 479         default:
 480                 return -EINVAL;
 481         }
 482 }
 483
 484 static int sx9324_set_samp_freq(struct sx_common_data *data,
 485                                 int val, int val2)
 486 {
 487         int i, ret;
 488
 489         for (i = 0; i < ARRAY_SIZE(sx9324_samp_freq_table); i++)
 490                 if (val == sx9324_samp_freq_table[i].val &&
 491                     val2 == sx9324_samp_freq_table[i].val2)
 492                         break;
 493
 494         if (i == ARRAY_SIZE(sx9324_samp_freq_table))
 495                 return -EINVAL;
 496
 497         mutex_lock(&data->mutex);
 498
 499         ret = regmap_update_bits(data->regmap,
 500                                  SX9324_REG_GNRL_CTRL0,
 501                                  SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, i);
 502
 503         mutex_unlock(&data->mutex);
 504
 505         return ret;
 506 }
 507
 508 static int sx9324_read_thresh(struct sx_common_data *data,
 509                               const struct iio_chan_spec *chan, int *val)
 510 {
 511         unsigned int regval;
 512         unsigned int reg;
 513         int ret;
 514
 515         /*
 516          * TODO(gwendal): Depending on the phase function
 517          * (proximity/table/body), retrieve the right threshold.
 518          * For now, return the proximity threshold.
 519          */
 520         reg = SX9324_REG_PROX_CTRL6 + chan->channel / 2;
 521         ret = regmap_read(data->regmap, reg, &regval);
 522         if (ret)
 523                 return ret;
 524
 525         if (regval <= 1)
 526                 *val = regval;
 527         else
 528                 *val = (regval * regval) / 2;
 529
 530         return IIO_VAL_INT;
 531 }
 532
 533 static int sx9324_read_hysteresis(struct sx_common_data *data,
 534                                   const struct iio_chan_spec *chan, int *val)
 535 {
 536         unsigned int regval, pthresh;
 537         int ret;
 538
 539         ret = sx9324_read_thresh(data, chan, &pthresh);
 540         if (ret < 0)
 541                 return ret;
 542
 543         ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, &regval);
 544         if (ret)
 545                 return ret;
 546
 547         regval = FIELD_GET(SX9324_REG_PROX_CTRL5_HYST_MASK, regval);
 548         if (!regval)
 549                 *val = 0;
 550         else
 551                 *val = pthresh >> (5 - regval);
 552
 553         return IIO_VAL_INT;
 554 }
 555
 556 static int sx9324_read_far_debounce(struct sx_common_data *data, int *val)
 557 {
 558         unsigned int regval;
 559         int ret;
 560
 561         ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, &regval);
 562         if (ret)
 563                 return ret;
 564
 565         regval = FIELD_GET(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, regval);
 566         if (regval)
 567                 *val = 1 << regval;
 568         else
 569                 *val = 0;
 570
 571         return IIO_VAL_INT;
 572 }
 573
 574 static int sx9324_read_close_debounce(struct sx_common_data *data, int *val)
 575 {
 576         unsigned int regval;
 577         int ret;
 578
 579         ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, &regval);
 580         if (ret)
 581                 return ret;
 582
 583         regval = FIELD_GET(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, regval);
 584         if (regval)
 585                 *val = 1 << regval;
 586         else
 587                 *val = 0;
 588
 589         return IIO_VAL_INT;
 590 }
 591
 592 static int sx9324_read_event_val(struct iio_dev *indio_dev,
 593                                  const struct iio_chan_spec *chan,
 594                                  enum iio_event_type type,
 595                                  enum iio_event_direction dir,
 596                                  enum iio_event_info info, int *val, int *val2)
 597 {
 598         struct sx_common_data *data = iio_priv(indio_dev);
 599
 600         if (chan->type != IIO_PROXIMITY)
 601                 return -EINVAL;
 602
 603         switch (info) {
 604         case IIO_EV_INFO_VALUE:
 605                 return sx9324_read_thresh(data, chan, val);
 606         case IIO_EV_INFO_PERIOD:
 607                 switch (dir) {
 608                 case IIO_EV_DIR_RISING:
 609                         return sx9324_read_far_debounce(data, val);
 610                 case IIO_EV_DIR_FALLING:
 611                         return sx9324_read_close_debounce(data, val);
 612                 default:
 613                         return -EINVAL;
 614                 }
 615         case IIO_EV_INFO_HYSTERESIS:
 616                 return sx9324_read_hysteresis(data, chan, val);
 617         default:
 618                 return -EINVAL;
 619         }
 620 }
 621
 622 static int sx9324_write_thresh(struct sx_common_data *data,
 623                                const struct iio_chan_spec *chan, int _val)
 624 {
 625         unsigned int reg, val = _val;
 626         int ret;
 627
 628         reg = SX9324_REG_PROX_CTRL6 + chan->channel / 2;
 629
 630         if (val >= 1)
 631                 val = int_sqrt(2 * val);
 632
 633         if (val > 0xff)
 634                 return -EINVAL;
 635
 636         mutex_lock(&data->mutex);
 637         ret = regmap_write(data->regmap, reg, val);
 638         mutex_unlock(&data->mutex);
 639
 640         return ret;
 641 }
 642
 643 static int sx9324_write_hysteresis(struct sx_common_data *data,
 644                                    const struct iio_chan_spec *chan, int _val)
 645 {
 646         unsigned int hyst, val = _val;
 647         int ret, pthresh;
 648
 649         ret = sx9324_read_thresh(data, chan, &pthresh);
 650         if (ret < 0)
 651                 return ret;
 652
 653         if (val == 0)
 654                 hyst = 0;
 655         else if (val >= pthresh >> 2)
 656                 hyst = 3;
 657         else if (val >= pthresh >> 3)
 658                 hyst = 2;
 659         else if (val >= pthresh >> 4)
 660                 hyst = 1;
 661         else
 662                 return -EINVAL;
 663
 664         hyst = FIELD_PREP(SX9324_REG_PROX_CTRL5_HYST_MASK, hyst);
 665         mutex_lock(&data->mutex);
 666         ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
 667                                  SX9324_REG_PROX_CTRL5_HYST_MASK, hyst);
 668         mutex_unlock(&data->mutex);
 669
 670         return ret;
 671 }
 672
 673 static int sx9324_write_far_debounce(struct sx_common_data *data, int _val)
 674 {
 675         unsigned int regval, val = _val;
 676         int ret;
 677
 678         if (val > 0)
 679                 val = ilog2(val);
 680         if (!FIELD_FIT(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, val))
 681                 return -EINVAL;
 682
 683         regval = FIELD_PREP(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, val);
 684
 685         mutex_lock(&data->mutex);
 686         ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
 687                                  SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK,
 688                                  regval);
 689         mutex_unlock(&data->mutex);
 690
 691         return ret;
 692 }
 693
 694 static int sx9324_write_close_debounce(struct sx_common_data *data, int _val)
 695 {
 696         unsigned int regval, val = _val;
 697         int ret;
 698
 699         if (val > 0)
 700                 val = ilog2(val);
 701         if (!FIELD_FIT(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, val))
 702                 return -EINVAL;
 703
 704         regval = FIELD_PREP(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, val);
 705
 706         mutex_lock(&data->mutex);
 707         ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
 708                                  SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK,
 709                                  regval);
 710         mutex_unlock(&data->mutex);
 711
 712         return ret;
 713 }
 714
 715 static int sx9324_write_event_val(struct iio_dev *indio_dev,
 716                                   const struct iio_chan_spec *chan,
 717                                   enum iio_event_type type,
 718                                   enum iio_event_direction dir,
 719                                   enum iio_event_info info, int val, int val2)
 720 {
 721         struct sx_common_data *data = iio_priv(indio_dev);
 722
 723         if (chan->type != IIO_PROXIMITY)
 724                 return -EINVAL;
 725
 726         switch (info) {
 727         case IIO_EV_INFO_VALUE:
 728                 return sx9324_write_thresh(data, chan, val);
 729         case IIO_EV_INFO_PERIOD:
 730                 switch (dir) {
 731                 case IIO_EV_DIR_RISING:
 732                         return sx9324_write_far_debounce(data, val);
 733                 case IIO_EV_DIR_FALLING:
 734                         return sx9324_write_close_debounce(data, val);
 735                 default:
 736                         return -EINVAL;
 737                 }
 738         case IIO_EV_INFO_HYSTERESIS:
 739                 return sx9324_write_hysteresis(data, chan, val);
 740         default:
 741                 return -EINVAL;
 742         }
 743 }
 744
 745 static int sx9324_write_gain(struct sx_common_data *data,
 746                              const struct iio_chan_spec *chan, int val)
 747 {
 748         unsigned int gain, reg;
 749         int ret;
 750
 751         reg = SX9324_REG_PROX_CTRL0 + chan->channel / 2;
 752
 753         gain = ilog2(val) + 1;
 754         if (val <= 0 || gain > SX9324_REG_PROX_CTRL0_GAIN_8)
 755                 return -EINVAL;
 756
 757         gain = FIELD_PREP(SX9324_REG_PROX_CTRL0_GAIN_MASK, gain);
 758
 759         mutex_lock(&data->mutex);
 760         ret = regmap_update_bits(data->regmap, reg,
 761                                  SX9324_REG_PROX_CTRL0_GAIN_MASK,
 762                                  gain);
 763         mutex_unlock(&data->mutex);
 764
 765         return ret;
 766 }
 767
 768 static int sx9324_write_raw(struct iio_dev *indio_dev,
 769                             const struct iio_chan_spec *chan, int val, int val2,
 770                             long mask)
 771 {
 772         struct sx_common_data *data = iio_priv(indio_dev);
 773
 774         switch (mask) {
 775         case IIO_CHAN_INFO_SAMP_FREQ:
 776                 return sx9324_set_samp_freq(data, val, val2);
 777         case IIO_CHAN_INFO_HARDWAREGAIN:
 778                 return sx9324_write_gain(data, chan, val);
 779         default:
 780                 return -EINVAL;
 781         }
 782 }
 783
 784 static const struct sx_common_reg_default sx9324_default_regs[] = {
 785         { SX9324_REG_IRQ_MSK, 0x00 },
 786         { SX9324_REG_IRQ_CFG0, 0x00, "irq_cfg0" },
 787         { SX9324_REG_IRQ_CFG1, SX9324_REG_IRQ_CFG1_FAILCOND, "irq_cfg1" },
 788         { SX9324_REG_IRQ_CFG2, 0x00, "irq_cfg2" },
 789         { SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS, "gnrl_ctrl0" },
 790         /*
 791          * The lower 4 bits should not be set as it enable sensors measurements.
 792          * Turning the detection on before the configuration values are set to
 793          * good values can cause the device to return erroneous readings.
 794          */
 795         { SX9324_REG_GNRL_CTRL1, SX9324_REG_GNRL_CTRL1_PAUSECTRL, "gnrl_ctrl1" },
 796
 797         { SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL0_RINT_LOWEST, "afe_ctrl0" },
 798         { SX9324_REG_AFE_CTRL3, 0x00, "afe_ctrl3" },
 799         { SX9324_REG_AFE_CTRL4, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
 800                 SX9324_REG_AFE_CTRL4_RES_100, "afe_ctrl4" },
 801         { SX9324_REG_AFE_CTRL6, 0x00, "afe_ctrl6" },
 802         { SX9324_REG_AFE_CTRL7, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
 803                 SX9324_REG_AFE_CTRL4_RES_100, "afe_ctrl7" },
 804
 805         /* TODO(gwendal): PHx use chip default or all grounded? */
 806         { SX9324_REG_AFE_PH0, 0x29, "afe_ph0" },
 807         { SX9324_REG_AFE_PH1, 0x26, "afe_ph1" },
 808         { SX9324_REG_AFE_PH2, 0x1a, "afe_ph2" },
 809         { SX9324_REG_AFE_PH3, 0x16, "afe_ph3" },
 810
 811         { SX9324_REG_AFE_CTRL8, SX9324_REG_AFE_CTRL8_RESERVED |
 812                 SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM, "afe_ctrl8" },
 813         { SX9324_REG_AFE_CTRL9, SX9324_REG_AFE_CTRL9_AGAIN_1, "afe_ctrl9" },
 814
 815         { SX9324_REG_PROX_CTRL0,
 816                 SX9324_REG_PROX_CTRL0_GAIN_1 << SX9324_REG_PROX_CTRL0_GAIN_SHIFT |
 817                 SX9324_REG_PROX_CTRL0_RAWFILT_1P50, "prox_ctrl0" },
 818         { SX9324_REG_PROX_CTRL1,
 819                 SX9324_REG_PROX_CTRL0_GAIN_1 << SX9324_REG_PROX_CTRL0_GAIN_SHIFT |
 820                 SX9324_REG_PROX_CTRL0_RAWFILT_1P50, "prox_ctrl1" },
 821         { SX9324_REG_PROX_CTRL2, SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K, "prox_ctrl2" },
 822         { SX9324_REG_PROX_CTRL3, SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES |
 823                 SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K, "prox_ctrl3" },
 824         { SX9324_REG_PROX_CTRL4, SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 |
 825                 SX9324_REG_PROX_CTRL4_AVGPOS_FILT_256, "prox_ctrl4" },
 826         { SX9324_REG_PROX_CTRL5, 0x00, "prox_ctrl5" },
 827         { SX9324_REG_PROX_CTRL6, SX9324_REG_PROX_CTRL6_PROXTHRESH_32, "prox_ctrl6" },
 828         { SX9324_REG_PROX_CTRL7, SX9324_REG_PROX_CTRL6_PROXTHRESH_32, "prox_ctrl7" },
 829         { SX9324_REG_ADV_CTRL0, 0x00, "adv_ctrl0" },
 830         { SX9324_REG_ADV_CTRL1, 0x00, "adv_ctrl1" },
 831         { SX9324_REG_ADV_CTRL2, 0x00, "adv_ctrl2" },
 832         { SX9324_REG_ADV_CTRL3, 0x00, "adv_ctrl3" },
 833         { SX9324_REG_ADV_CTRL4, 0x00, "adv_ctrl4" },
 834         { SX9324_REG_ADV_CTRL5, SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 |
 835                 SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1, "adv_ctrl5" },
 836         { SX9324_REG_ADV_CTRL6, 0x00, "adv_ctrl6" },
 837         { SX9324_REG_ADV_CTRL7, 0x00, "adv_ctrl7" },
 838         { SX9324_REG_ADV_CTRL8, 0x00, "adv_ctrl8" },
 839         { SX9324_REG_ADV_CTRL9, 0x00, "adv_ctrl9" },
 840         /* Body/Table threshold */
 841         { SX9324_REG_ADV_CTRL10, 0x00, "adv_ctrl10" },
 842         { SX9324_REG_ADV_CTRL11, 0x00, "adv_ctrl11" },
 843         { SX9324_REG_ADV_CTRL12, 0x00, "adv_ctrl12" },
 844         /* TODO(gwendal): SAR currenly disabled */
 845         { SX9324_REG_ADV_CTRL13, 0x00, "adv_ctrl13" },
 846         { SX9324_REG_ADV_CTRL14, 0x00, "adv_ctrl14" },
 847         { SX9324_REG_ADV_CTRL15, 0x00, "adv_ctrl15" },
 848         { SX9324_REG_ADV_CTRL16, 0x00, "adv_ctrl16" },
 849         { SX9324_REG_ADV_CTRL17, 0x00, "adv_ctrl17" },
 850         { SX9324_REG_ADV_CTRL18, 0x00, "adv_ctrl18" },
 851         { SX9324_REG_ADV_CTRL19,
 852                 SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION, "adv_ctrl19" },
 853         { SX9324_REG_ADV_CTRL20,
 854                 SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION, "adv_ctrl20" },
 855 };
 856
 857 /* Activate all channels and perform an initial compensation. */
 858 static int sx9324_init_compensation(struct iio_dev *indio_dev)
 859 {
 860         struct sx_common_data *data = iio_priv(indio_dev);
 861         unsigned int val;
 862         int ret;
 863
 864         /* run the compensation phase on all channels */
 865         ret = regmap_update_bits(data->regmap, SX9324_REG_STAT2,
 866                                  SX9324_REG_STAT2_COMPSTAT_MASK,
 867                                  SX9324_REG_STAT2_COMPSTAT_MASK);
 868         if (ret)
 869                 return ret;
 870
 871         return regmap_read_poll_timeout(data->regmap, SX9324_REG_STAT2, val,
 872                                         !(val & SX9324_REG_STAT2_COMPSTAT_MASK),
 873                                         20000, 2000000);
 874 }
 875
 876 static const struct sx_common_reg_default *
 877 sx9324_get_default_reg(struct device *dev, int idx,
 878                        struct sx_common_reg_default *reg_def)
 879 {
 880         static const char * const sx9324_rints[] = { "lowest", "low", "high",
 881                 "highest" };
 882         static const char * const sx9324_csidle[] = { "hi-z", "hi-z", "gnd",
 883                 "vdd" };
 884 #define SX9324_PIN_DEF "semtech,ph0-pin"
 885 #define SX9324_RESOLUTION_DEF "semtech,ph01-resolution"
 886 #define SX9324_PROXRAW_DEF "semtech,ph01-proxraw-strength"
 887         unsigned int pin_defs[SX9324_NUM_PINS];
 888         char prop[] = SX9324_PROXRAW_DEF;
 889         u32 start = 0, raw = 0, pos = 0;
 890         int ret, count, ph, pin;
 891
 892         memcpy(reg_def, &sx9324_default_regs[idx], sizeof(*reg_def));
 893
 894         sx_common_get_raw_register_config(dev, reg_def);
 895         switch (reg_def->reg) {
 896         case SX9324_REG_AFE_PH0:
 897         case SX9324_REG_AFE_PH1:
 898         case SX9324_REG_AFE_PH2:
 899         case SX9324_REG_AFE_PH3:
 900                 ph = reg_def->reg - SX9324_REG_AFE_PH0;
 901                 snprintf(prop, ARRAY_SIZE(prop), "semtech,ph%d-pin", ph);
 902
 903                 count = device_property_count_u32(dev, prop);
 904                 if (count != ARRAY_SIZE(pin_defs))
 905                         break;
 906                 ret = device_property_read_u32_array(dev, prop, pin_defs,
 907                                                      ARRAY_SIZE(pin_defs));
 908                 if (ret)
 909                         break;
 910
 911                 for (pin = 0; pin < SX9324_NUM_PINS; pin++)
 912                         raw |= (pin_defs[pin] << (2 * pin)) &
 913                                SX9324_REG_AFE_PH0_PIN_MASK(pin);
 914                 reg_def->def = raw;
 915                 break;
 916         case SX9324_REG_AFE_CTRL0:
 917                 ret = device_property_match_property_string(dev, "semtech,cs-idle-sleep",
 918                                                             sx9324_csidle,
 919                                                             ARRAY_SIZE(sx9324_csidle));
 920                 if (ret >= 0) {
 921                         reg_def->def &= ~SX9324_REG_AFE_CTRL0_CSIDLE_MASK;
 922                         reg_def->def |= ret << SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT;
 923                 }
 924
 925                 ret = device_property_match_property_string(dev, "semtech,int-comp-resistor",
 926                                                             sx9324_rints,
 927                                                             ARRAY_SIZE(sx9324_rints));
 928                 if (ret >= 0) {
 929                         reg_def->def &= ~SX9324_REG_AFE_CTRL0_RINT_MASK;
 930                         reg_def->def |= ret << SX9324_REG_AFE_CTRL0_RINT_SHIFT;
 931                 }
 932                 break;
 933         case SX9324_REG_AFE_CTRL4:
 934         case SX9324_REG_AFE_CTRL7:
 935                 if (reg_def->reg == SX9324_REG_AFE_CTRL4)
 936                         strncpy(prop, "semtech,ph01-resolution",
 937                                 ARRAY_SIZE(prop));
 938                 else
 939                         strncpy(prop, "semtech,ph23-resolution",
 940                                 ARRAY_SIZE(prop));
 941
 942                 ret = device_property_read_u32(dev, prop, &raw);
 943                 if (ret)
 944                         break;
 945
 946                 raw = ilog2(raw) - 3;
 947
 948                 reg_def->def &= ~SX9324_REG_AFE_CTRL4_RESOLUTION_MASK;
 949                 reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL4_RESOLUTION_MASK,
 950                                            raw);
 951                 break;
 952         case SX9324_REG_AFE_CTRL8:
 953                 ret = device_property_read_u32(dev,
 954                                 "semtech,input-precharge-resistor-ohms",
 955                                 &raw);
 956                 if (ret)
 957                         break;
 958
 959                 reg_def->def &= ~SX9324_REG_AFE_CTRL8_RESFILTIN_MASK;
 960                 reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL8_RESFILTIN_MASK,
 961                                            raw / 2000);
 962                 break;
 963
 964         case SX9324_REG_AFE_CTRL9:
 965                 ret = device_property_read_u32(dev,
 966                                 "semtech,input-analog-gain", &raw);
 967                 if (ret)
 968                         break;
 969                 /*
 970                  * The analog gain has the following setting:
 971                  * +---------+----------------+----------------+
 972                  * | dt(raw) | physical value | register value |
 973                  * +---------+----------------+----------------+
 974                  * |  0      |      x1.247    |      6         |
 975                  * |  1      |      x1        |      8         |
 976                  * |  2      |      x0.768    |     11         |
 977                  * |  3      |      x0.552    |     15         |
 978                  * +---------+----------------+----------------+
 979                  */
 980                 reg_def->def &= ~SX9324_REG_AFE_CTRL9_AGAIN_MASK;
 981                 reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL9_AGAIN_MASK,
 982                                            6 + raw * (raw + 3) / 2);
 983                 break;
 984
 985         case SX9324_REG_ADV_CTRL5:
 986                 ret = device_property_read_u32(dev, "semtech,startup-sensor",
 987                                                &start);
 988                 if (ret)
 989                         break;
 990
 991                 reg_def->def &= ~SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK;
 992                 reg_def->def |= FIELD_PREP(SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK,
 993                                            start);
 994                 break;
 995         case SX9324_REG_PROX_CTRL4:
 996                 ret = device_property_read_u32(dev, "semtech,avg-pos-strength",
 997                                                &pos);
 998                 if (ret)
 999                         break;
1000
1001                 /* Powers of 2, except for a gap between 16 and 64 */
1002                 raw = clamp(ilog2(pos), 3, 11) - (pos >= 32 ? 4 : 3);
1003
1004                 reg_def->def &= ~SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK;
1005                 reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK,
1006                                            raw);
1007                 break;
1008         case SX9324_REG_PROX_CTRL0:
1009         case SX9324_REG_PROX_CTRL1:
1010                 if (reg_def->reg == SX9324_REG_PROX_CTRL0)
1011                         strncpy(prop, "semtech,ph01-proxraw-strength",
1012                                 ARRAY_SIZE(prop));
1013                 else
1014                         strncpy(prop, "semtech,ph23-proxraw-strength",
1015                                 ARRAY_SIZE(prop));
1016                 ret = device_property_read_u32(dev, prop, &raw);
1017                 if (ret)
1018                         break;
1019
1020                 reg_def->def &= ~SX9324_REG_PROX_CTRL0_RAWFILT_MASK;
1021                 reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL0_RAWFILT_MASK,
1022                                            raw);
1023                 break;
1024         }
1025         return reg_def;
1026 }
1027
1028 static int sx9324_check_whoami(struct device *dev,
1029                                struct iio_dev *indio_dev)
1030 {
1031         /*
1032          * Only one sensor for this driver. Assuming the device tree
1033          * is correct, just set the sensor name.
1034          */
1035         indio_dev->name = "sx9324";
1036         return 0;
1037 }
1038
1039 static const struct sx_common_chip_info sx9324_chip_info = {
1040         .reg_stat = SX9324_REG_STAT0,
1041         .reg_irq_msk = SX9324_REG_IRQ_MSK,
1042         .reg_enable_chan = SX9324_REG_GNRL_CTRL1,
1043         .reg_reset = SX9324_REG_RESET,
1044
1045         .mask_enable_chan = SX9324_REG_GNRL_CTRL1_PHEN_MASK,
1046         .irq_msk_offset = 3,
1047         .num_channels = SX9324_NUM_CHANNELS,
1048         .num_default_regs = ARRAY_SIZE(sx9324_default_regs),
1049
1050         .ops = {
1051                 .read_prox_data = sx9324_read_prox_data,
1052                 .check_whoami = sx9324_check_whoami,
1053                 .init_compensation = sx9324_init_compensation,
1054                 .wait_for_sample = sx9324_wait_for_sample,
1055                 .get_default_reg = sx9324_get_default_reg,
1056         },
1057
1058         .iio_channels = sx9324_channels,
1059         .num_iio_channels = ARRAY_SIZE(sx9324_channels),
1060         .iio_info =  {
1061                 .read_raw = sx9324_read_raw,
1062                 .read_avail = sx9324_read_avail,
1063                 .read_event_value = sx9324_read_event_val,
1064                 .write_event_value = sx9324_write_event_val,
1065                 .write_raw = sx9324_write_raw,
1066                 .read_event_config = sx_common_read_event_config,
1067                 .write_event_config = sx_common_write_event_config,
1068         },
1069 };
1070
1071 static int sx9324_probe(struct i2c_client *client)
1072 {
1073         return sx_common_probe(client, &sx9324_chip_info, &sx9324_regmap_config);
1074 }
1075
1076 static int sx9324_suspend(struct device *dev)
1077 {
1078         struct sx_common_data *data = iio_priv(dev_get_drvdata(dev));
1079         unsigned int regval;
1080         int ret;
1081
1082         disable_irq_nosync(data->client->irq);
1083
1084         mutex_lock(&data->mutex);
1085         ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL1, &regval);
1086
1087         data->suspend_ctrl =
1088                 FIELD_GET(SX9324_REG_GNRL_CTRL1_PHEN_MASK, regval);
1089
1090         if (ret < 0)
1091                 goto out;
1092
1093         /* Disable all phases, send the device to sleep. */
1094         ret = regmap_write(data->regmap, SX9324_REG_GNRL_CTRL1, 0);
1095
1096 out:
1097         mutex_unlock(&data->mutex);
1098         return ret;
1099 }
1100
1101 static int sx9324_resume(struct device *dev)
1102 {
1103         struct sx_common_data *data = iio_priv(dev_get_drvdata(dev));
1104         int ret;
1105
1106         mutex_lock(&data->mutex);
1107         ret = regmap_write(data->regmap, SX9324_REG_GNRL_CTRL1,
1108                            data->suspend_ctrl | SX9324_REG_GNRL_CTRL1_PAUSECTRL);
1109         mutex_unlock(&data->mutex);
1110         if (ret)
1111                 return ret;
1112
1113         enable_irq(data->client->irq);
1114         return 0;
1115 }
1116
1117 static DEFINE_SIMPLE_DEV_PM_OPS(sx9324_pm_ops, sx9324_suspend, sx9324_resume);
1118
1119 static const struct acpi_device_id sx9324_acpi_match[] = {
1120         { "STH9324", SX9324_WHOAMI_VALUE },
1121         { }
1122 };
1123 MODULE_DEVICE_TABLE(acpi, sx9324_acpi_match);
1124
1125 static const struct of_device_id sx9324_of_match[] = {
1126         { .compatible = "semtech,sx9324", (void *)SX9324_WHOAMI_VALUE },
1127         { }
1128 };
1129 MODULE_DEVICE_TABLE(of, sx9324_of_match);
1130
1131 static const struct i2c_device_id sx9324_id[] = {
1132         { "sx9324", SX9324_WHOAMI_VALUE },
1133         { }
1134 };
1135 MODULE_DEVICE_TABLE(i2c, sx9324_id);
1136
1137 static struct i2c_driver sx9324_driver = {
1138         .driver = {
1139                 .name   = "sx9324",
1140                 .acpi_match_table = sx9324_acpi_match,
1141                 .of_match_table = sx9324_of_match,
1142                 .pm = pm_sleep_ptr(&sx9324_pm_ops),
1143
1144                 /*
1145                  * Lots of i2c transfers in probe + over 200 ms waiting in
1146                  * sx9324_init_compensation() mean a slow probe; prefer async
1147                  * so we don't delay boot if we're builtin to the kernel.
1148                  */
1149                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1150         },
1151         .probe          = sx9324_probe,
1152         .id_table       = sx9324_id,
1153 };
1154 module_i2c_driver(sx9324_driver);
1155
1156 MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
1157 MODULE_DESCRIPTION("Driver for Semtech SX9324 proximity sensor");
1158 MODULE_LICENSE("GPL v2");
1159 MODULE_IMPORT_NS(SEMTECH_PROX);