drivers/iio/health/afe4403.c

   1 /*
   2  * AFE4403 Heart Rate Monitors and Low-Cost Pulse Oximeters
   3  *
   4  * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
   5  *      Andrew F. Davis <afd@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  */
  16
  17 #include <linux/device.h>
  18 #include <linux/err.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/regmap.h>
  23 #include <linux/spi/spi.h>
  24 #include <linux/sysfs.h>
  25 #include <linux/regulator/consumer.h>
  26
  27 #include <linux/iio/iio.h>
  28 #include <linux/iio/sysfs.h>
  29 #include <linux/iio/buffer.h>
  30 #include <linux/iio/trigger.h>
  31 #include <linux/iio/triggered_buffer.h>
  32 #include <linux/iio/trigger_consumer.h>
  33
  34 #include "afe440x.h"
  35
  36 #define AFE4403_DRIVER_NAME             "afe4403"
  37
  38 /* AFE4403 Registers */
  39 #define AFE4403_TIAGAIN                 0x20
  40 #define AFE4403_TIA_AMB_GAIN            0x21
  41
  42 /* AFE4403 LEDCNTRL values */
  43 #define AFE440X_LEDCNTRL_RANGE_TX_HALF  0x1
  44 #define AFE440X_LEDCNTRL_RANGE_TX_FULL  0x2
  45 #define AFE440X_LEDCNTRL_RANGE_TX_OFF   0x3
  46
  47 /* AFE4403 CONTROL2 values */
  48 #define AFE440X_CONTROL2_TX_REF_025     0x0
  49 #define AFE440X_CONTROL2_TX_REF_050     0x1
  50 #define AFE440X_CONTROL2_TX_REF_100     0x2
  51 #define AFE440X_CONTROL2_TX_REF_075     0x3
  52
  53 /* AFE4403 CONTROL3 values */
  54 #define AFE440X_CONTROL3_CLK_DIV_2      0x0
  55 #define AFE440X_CONTROL3_CLK_DIV_4      0x2
  56 #define AFE440X_CONTROL3_CLK_DIV_6      0x3
  57 #define AFE440X_CONTROL3_CLK_DIV_8      0x4
  58 #define AFE440X_CONTROL3_CLK_DIV_12     0x5
  59 #define AFE440X_CONTROL3_CLK_DIV_1      0x7
  60
  61 /* AFE4403 TIAGAIN_CAP values */
  62 #define AFE4403_TIAGAIN_CAP_5_P         0x0
  63 #define AFE4403_TIAGAIN_CAP_10_P        0x1
  64 #define AFE4403_TIAGAIN_CAP_20_P        0x2
  65 #define AFE4403_TIAGAIN_CAP_30_P        0x3
  66 #define AFE4403_TIAGAIN_CAP_55_P        0x8
  67 #define AFE4403_TIAGAIN_CAP_155_P       0x10
  68
  69 /* AFE4403 TIAGAIN_RES values */
  70 #define AFE4403_TIAGAIN_RES_500_K       0x0
  71 #define AFE4403_TIAGAIN_RES_250_K       0x1
  72 #define AFE4403_TIAGAIN_RES_100_K       0x2
  73 #define AFE4403_TIAGAIN_RES_50_K        0x3
  74 #define AFE4403_TIAGAIN_RES_25_K        0x4
  75 #define AFE4403_TIAGAIN_RES_10_K        0x5
  76 #define AFE4403_TIAGAIN_RES_1_M         0x6
  77 #define AFE4403_TIAGAIN_RES_NONE        0x7
  78
  79 enum afe4403_fields {
  80         /* Gains */
  81         F_RF_LED1, F_CF_LED1,
  82         F_RF_LED, F_CF_LED,
  83
  84         /* LED Current */
  85         F_ILED1, F_ILED2,
  86
  87         /* sentinel */
  88         F_MAX_FIELDS
  89 };
  90
  91 static const struct reg_field afe4403_reg_fields[] = {
  92         /* Gains */
  93         [F_RF_LED1]     = REG_FIELD(AFE4403_TIAGAIN, 0, 2),
  94         [F_CF_LED1]     = REG_FIELD(AFE4403_TIAGAIN, 3, 7),
  95         [F_RF_LED]      = REG_FIELD(AFE4403_TIA_AMB_GAIN, 0, 2),
  96         [F_CF_LED]      = REG_FIELD(AFE4403_TIA_AMB_GAIN, 3, 7),
  97         /* LED Current */
  98         [F_ILED1]       = REG_FIELD(AFE440X_LEDCNTRL, 0, 7),
  99         [F_ILED2]       = REG_FIELD(AFE440X_LEDCNTRL, 8, 15),
 100 };
 101
 102 /**
 103  * struct afe4403_data - AFE4403 device instance data
 104  * @dev: Device structure
 105  * @spi: SPI device handle
 106  * @regmap: Register map of the device
 107  * @fields: Register fields of the device
 108  * @regulator: Pointer to the regulator for the IC
 109  * @trig: IIO trigger for this device
 110  * @irq: ADC_RDY line interrupt number
 111  */
 112 struct afe4403_data {
 113         struct device *dev;
 114         struct spi_device *spi;
 115         struct regmap *regmap;
 116         struct regmap_field *fields[F_MAX_FIELDS];
 117         struct regulator *regulator;
 118         struct iio_trigger *trig;
 119         int irq;
 120 };
 121
 122 enum afe4403_chan_id {
 123         LED2 = 1,
 124         ALED2,
 125         LED1,
 126         ALED1,
 127         LED2_ALED2,
 128         LED1_ALED1,
 129 };
 130
 131 static const unsigned int afe4403_channel_values[] = {
 132         [LED2] = AFE440X_LED2VAL,
 133         [ALED2] = AFE440X_ALED2VAL,
 134         [LED1] = AFE440X_LED1VAL,
 135         [ALED1] = AFE440X_ALED1VAL,
 136         [LED2_ALED2] = AFE440X_LED2_ALED2VAL,
 137         [LED1_ALED1] = AFE440X_LED1_ALED1VAL,
 138 };
 139
 140 static const unsigned int afe4403_channel_leds[] = {
 141         [LED2] = F_ILED2,
 142         [LED1] = F_ILED1,
 143 };
 144
 145 static const struct iio_chan_spec afe4403_channels[] = {
 146         /* ADC values */
 147         AFE440X_INTENSITY_CHAN(LED2, 0),
 148         AFE440X_INTENSITY_CHAN(ALED2, 0),
 149         AFE440X_INTENSITY_CHAN(LED1, 0),
 150         AFE440X_INTENSITY_CHAN(ALED1, 0),
 151         AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
 152         AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
 153         /* LED current */
 154         AFE440X_CURRENT_CHAN(LED2),
 155         AFE440X_CURRENT_CHAN(LED1),
 156 };
 157
 158 static const struct afe440x_val_table afe4403_res_table[] = {
 159         { 500000 }, { 250000 }, { 100000 }, { 50000 },
 160         { 25000 }, { 10000 }, { 1000000 }, { 0 },
 161 };
 162 AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4403_res_table);
 163
 164 static const struct afe440x_val_table afe4403_cap_table[] = {
 165         { 0, 5000 }, { 0, 10000 }, { 0, 20000 }, { 0, 25000 },
 166         { 0, 30000 }, { 0, 35000 }, { 0, 45000 }, { 0, 50000 },
 167         { 0, 55000 }, { 0, 60000 }, { 0, 70000 }, { 0, 75000 },
 168         { 0, 80000 }, { 0, 85000 }, { 0, 95000 }, { 0, 100000 },
 169         { 0, 155000 }, { 0, 160000 }, { 0, 170000 }, { 0, 175000 },
 170         { 0, 180000 }, { 0, 185000 }, { 0, 195000 }, { 0, 200000 },
 171         { 0, 205000 }, { 0, 210000 }, { 0, 220000 }, { 0, 225000 },
 172         { 0, 230000 }, { 0, 235000 }, { 0, 245000 }, { 0, 250000 },
 173 };
 174 AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4403_cap_table);
 175
 176 static ssize_t afe440x_show_register(struct device *dev,
 177                                      struct device_attribute *attr,
 178                                      char *buf)
 179 {
 180         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 181         struct afe4403_data *afe = iio_priv(indio_dev);
 182         struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
 183         unsigned int reg_val;
 184         int vals[2];
 185         int ret;
 186
 187         ret = regmap_field_read(afe->fields[afe440x_attr->field], &reg_val);
 188         if (ret)
 189                 return ret;
 190
 191         if (reg_val >= afe440x_attr->table_size)
 192                 return -EINVAL;
 193
 194         vals[0] = afe440x_attr->val_table[reg_val].integer;
 195         vals[1] = afe440x_attr->val_table[reg_val].fract;
 196
 197         return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
 198 }
 199
 200 static ssize_t afe440x_store_register(struct device *dev,
 201                                       struct device_attribute *attr,
 202                                       const char *buf, size_t count)
 203 {
 204         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 205         struct afe4403_data *afe = iio_priv(indio_dev);
 206         struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
 207         int val, integer, fract, ret;
 208
 209         ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
 210         if (ret)
 211                 return ret;
 212
 213         for (val = 0; val < afe440x_attr->table_size; val++)
 214                 if (afe440x_attr->val_table[val].integer == integer &&
 215                     afe440x_attr->val_table[val].fract == fract)
 216                         break;
 217         if (val == afe440x_attr->table_size)
 218                 return -EINVAL;
 219
 220         ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
 221         if (ret)
 222                 return ret;
 223
 224         return count;
 225 }
 226
 227 static AFE440X_ATTR(in_intensity1_resistance, F_RF_LED, afe4403_res_table);
 228 static AFE440X_ATTR(in_intensity1_capacitance, F_CF_LED, afe4403_cap_table);
 229
 230 static AFE440X_ATTR(in_intensity2_resistance, F_RF_LED, afe4403_res_table);
 231 static AFE440X_ATTR(in_intensity2_capacitance, F_CF_LED, afe4403_cap_table);
 232
 233 static AFE440X_ATTR(in_intensity3_resistance, F_RF_LED1, afe4403_res_table);
 234 static AFE440X_ATTR(in_intensity3_capacitance, F_CF_LED1, afe4403_cap_table);
 235
 236 static AFE440X_ATTR(in_intensity4_resistance, F_RF_LED1, afe4403_res_table);
 237 static AFE440X_ATTR(in_intensity4_capacitance, F_CF_LED1, afe4403_cap_table);
 238
 239 static struct attribute *afe440x_attributes[] = {
 240         &dev_attr_in_intensity_resistance_available.attr,
 241         &dev_attr_in_intensity_capacitance_available.attr,
 242         &afe440x_attr_in_intensity1_resistance.dev_attr.attr,
 243         &afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
 244         &afe440x_attr_in_intensity2_resistance.dev_attr.attr,
 245         &afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
 246         &afe440x_attr_in_intensity3_resistance.dev_attr.attr,
 247         &afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
 248         &afe440x_attr_in_intensity4_resistance.dev_attr.attr,
 249         &afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
 250         NULL
 251 };
 252
 253 static const struct attribute_group afe440x_attribute_group = {
 254         .attrs = afe440x_attributes
 255 };
 256
 257 static int afe4403_read(struct afe4403_data *afe, unsigned int reg, u32 *val)
 258 {
 259         u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
 260         u8 rx[3];
 261         int ret;
 262
 263         /* Enable reading from the device */
 264         ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
 265         if (ret)
 266                 return ret;
 267
 268         ret = spi_write_then_read(afe->spi, &reg, 1, rx, 3);
 269         if (ret)
 270                 return ret;
 271
 272         *val = (rx[0] << 16) |
 273                 (rx[1] << 8) |
 274                 (rx[2]);
 275
 276         /* Disable reading from the device */
 277         tx[3] = AFE440X_CONTROL0_WRITE;
 278         ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
 279         if (ret)
 280                 return ret;
 281
 282         return 0;
 283 }
 284
 285 static int afe4403_read_raw(struct iio_dev *indio_dev,
 286                             struct iio_chan_spec const *chan,
 287                             int *val, int *val2, long mask)
 288 {
 289         struct afe4403_data *afe = iio_priv(indio_dev);
 290         unsigned int reg = afe4403_channel_values[chan->address];
 291         unsigned int field = afe4403_channel_leds[chan->address];
 292         int ret;
 293
 294         switch (chan->type) {
 295         case IIO_INTENSITY:
 296                 switch (mask) {
 297                 case IIO_CHAN_INFO_RAW:
 298                         ret = afe4403_read(afe, reg, val);
 299                         if (ret)
 300                                 return ret;
 301                         return IIO_VAL_INT;
 302                 }
 303                 break;
 304         case IIO_CURRENT:
 305                 switch (mask) {
 306                 case IIO_CHAN_INFO_RAW:
 307                         ret = regmap_field_read(afe->fields[field], val);
 308                         if (ret)
 309                                 return ret;
 310                         return IIO_VAL_INT;
 311                 case IIO_CHAN_INFO_SCALE:
 312                         *val = 0;
 313                         *val2 = 800000;
 314                         return IIO_VAL_INT_PLUS_MICRO;
 315                 }
 316                 break;
 317         default:
 318                 break;
 319         }
 320
 321         return -EINVAL;
 322 }
 323
 324 static int afe4403_write_raw(struct iio_dev *indio_dev,
 325                              struct iio_chan_spec const *chan,
 326                              int val, int val2, long mask)
 327 {
 328         struct afe4403_data *afe = iio_priv(indio_dev);
 329         unsigned int field = afe4403_channel_leds[chan->address];
 330
 331         switch (chan->type) {
 332         case IIO_CURRENT:
 333                 switch (mask) {
 334                 case IIO_CHAN_INFO_RAW:
 335                         return regmap_field_write(afe->fields[field], val);
 336                 }
 337                 break;
 338         default:
 339                 break;
 340         }
 341
 342         return -EINVAL;
 343 }
 344
 345 static const struct iio_info afe4403_iio_info = {
 346         .attrs = &afe440x_attribute_group,
 347         .read_raw = afe4403_read_raw,
 348         .write_raw = afe4403_write_raw,
 349         .driver_module = THIS_MODULE,
 350 };
 351
 352 static irqreturn_t afe4403_trigger_handler(int irq, void *private)
 353 {
 354         struct iio_poll_func *pf = private;
 355         struct iio_dev *indio_dev = pf->indio_dev;
 356         struct afe4403_data *afe = iio_priv(indio_dev);
 357         int ret, bit, i = 0;
 358         s32 buffer[8];
 359         u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
 360         u8 rx[3];
 361
 362         /* Enable reading from the device */
 363         ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
 364         if (ret)
 365                 goto err;
 366
 367         for_each_set_bit(bit, indio_dev->active_scan_mask,
 368                          indio_dev->masklength) {
 369                 ret = spi_write_then_read(afe->spi,
 370                                           &afe4403_channel_values[bit], 1,
 371                                           rx, 3);
 372                 if (ret)
 373                         goto err;
 374
 375                 buffer[i++] = (rx[0] << 16) |
 376                                 (rx[1] << 8) |
 377                                 (rx[2]);
 378         }
 379
 380         /* Disable reading from the device */
 381         tx[3] = AFE440X_CONTROL0_WRITE;
 382         ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
 383         if (ret)
 384                 goto err;
 385
 386         iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp);
 387 err:
 388         iio_trigger_notify_done(indio_dev->trig);
 389
 390         return IRQ_HANDLED;
 391 }
 392
 393 static const struct iio_trigger_ops afe4403_trigger_ops = {
 394         .owner = THIS_MODULE,
 395 };
 396
 397 #define AFE4403_TIMING_PAIRS                    \
 398         { AFE440X_LED2STC,      0x000050 },     \
 399         { AFE440X_LED2ENDC,     0x0003e7 },     \
 400         { AFE440X_LED1LEDSTC,   0x0007d0 },     \
 401         { AFE440X_LED1LEDENDC,  0x000bb7 },     \
 402         { AFE440X_ALED2STC,     0x000438 },     \
 403         { AFE440X_ALED2ENDC,    0x0007cf },     \
 404         { AFE440X_LED1STC,      0x000820 },     \
 405         { AFE440X_LED1ENDC,     0x000bb7 },     \
 406         { AFE440X_LED2LEDSTC,   0x000000 },     \
 407         { AFE440X_LED2LEDENDC,  0x0003e7 },     \
 408         { AFE440X_ALED1STC,     0x000c08 },     \
 409         { AFE440X_ALED1ENDC,    0x000f9f },     \
 410         { AFE440X_LED2CONVST,   0x0003ef },     \
 411         { AFE440X_LED2CONVEND,  0x0007cf },     \
 412         { AFE440X_ALED2CONVST,  0x0007d7 },     \
 413         { AFE440X_ALED2CONVEND, 0x000bb7 },     \
 414         { AFE440X_LED1CONVST,   0x000bbf },     \
 415         { AFE440X_LED1CONVEND,  0x009c3f },     \
 416         { AFE440X_ALED1CONVST,  0x000fa7 },     \
 417         { AFE440X_ALED1CONVEND, 0x001387 },     \
 418         { AFE440X_ADCRSTSTCT0,  0x0003e8 },     \
 419         { AFE440X_ADCRSTENDCT0, 0x0003eb },     \
 420         { AFE440X_ADCRSTSTCT1,  0x0007d0 },     \
 421         { AFE440X_ADCRSTENDCT1, 0x0007d3 },     \
 422         { AFE440X_ADCRSTSTCT2,  0x000bb8 },     \
 423         { AFE440X_ADCRSTENDCT2, 0x000bbb },     \
 424         { AFE440X_ADCRSTSTCT3,  0x000fa0 },     \
 425         { AFE440X_ADCRSTENDCT3, 0x000fa3 },     \
 426         { AFE440X_PRPCOUNT,     0x009c3f },     \
 427         { AFE440X_PDNCYCLESTC,  0x001518 },     \
 428         { AFE440X_PDNCYCLEENDC, 0x00991f }
 429
 430 static const struct reg_sequence afe4403_reg_sequences[] = {
 431         AFE4403_TIMING_PAIRS,
 432         { AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
 433         { AFE4403_TIAGAIN, AFE440X_TIAGAIN_ENSEPGAIN },
 434 };
 435
 436 static const struct regmap_range afe4403_yes_ranges[] = {
 437         regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
 438 };
 439
 440 static const struct regmap_access_table afe4403_volatile_table = {
 441         .yes_ranges = afe4403_yes_ranges,
 442         .n_yes_ranges = ARRAY_SIZE(afe4403_yes_ranges),
 443 };
 444
 445 static const struct regmap_config afe4403_regmap_config = {
 446         .reg_bits = 8,
 447         .val_bits = 24,
 448
 449         .max_register = AFE440X_PDNCYCLEENDC,
 450         .cache_type = REGCACHE_RBTREE,
 451         .volatile_table = &afe4403_volatile_table,
 452 };
 453
 454 static const struct of_device_id afe4403_of_match[] = {
 455         { .compatible = "ti,afe4403", },
 456         { /* sentinel */ }
 457 };
 458 MODULE_DEVICE_TABLE(of, afe4403_of_match);
 459
 460 static int __maybe_unused afe4403_suspend(struct device *dev)
 461 {
 462         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 463         struct afe4403_data *afe = iio_priv(indio_dev);
 464         int ret;
 465
 466         ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
 467                                  AFE440X_CONTROL2_PDN_AFE,
 468                                  AFE440X_CONTROL2_PDN_AFE);
 469         if (ret)
 470                 return ret;
 471
 472         ret = regulator_disable(afe->regulator);
 473         if (ret) {
 474                 dev_err(dev, "Unable to disable regulator\n");
 475                 return ret;
 476         }
 477
 478         return 0;
 479 }
 480
 481 static int __maybe_unused afe4403_resume(struct device *dev)
 482 {
 483         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 484         struct afe4403_data *afe = iio_priv(indio_dev);
 485         int ret;
 486
 487         ret = regulator_enable(afe->regulator);
 488         if (ret) {
 489                 dev_err(dev, "Unable to enable regulator\n");
 490                 return ret;
 491         }
 492
 493         ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
 494                                  AFE440X_CONTROL2_PDN_AFE, 0);
 495         if (ret)
 496                 return ret;
 497
 498         return 0;
 499 }
 500
 501 static SIMPLE_DEV_PM_OPS(afe4403_pm_ops, afe4403_suspend, afe4403_resume);
 502
 503 static int afe4403_probe(struct spi_device *spi)
 504 {
 505         struct iio_dev *indio_dev;
 506         struct afe4403_data *afe;
 507         int i, ret;
 508
 509         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*afe));
 510         if (!indio_dev)
 511                 return -ENOMEM;
 512
 513         afe = iio_priv(indio_dev);
 514         spi_set_drvdata(spi, indio_dev);
 515
 516         afe->dev = &spi->dev;
 517         afe->spi = spi;
 518         afe->irq = spi->irq;
 519
 520         afe->regmap = devm_regmap_init_spi(spi, &afe4403_regmap_config);
 521         if (IS_ERR(afe->regmap)) {
 522                 dev_err(afe->dev, "Unable to allocate register map\n");
 523                 return PTR_ERR(afe->regmap);
 524         }
 525
 526         for (i = 0; i < F_MAX_FIELDS; i++) {
 527                 afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
 528                                                          afe4403_reg_fields[i]);
 529                 if (IS_ERR(afe->fields[i])) {
 530                         dev_err(afe->dev, "Unable to allocate regmap fields\n");
 531                         return PTR_ERR(afe->fields[i]);
 532                 }
 533         }
 534
 535         afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
 536         if (IS_ERR(afe->regulator)) {
 537                 dev_err(afe->dev, "Unable to get regulator\n");
 538                 return PTR_ERR(afe->regulator);
 539         }
 540         ret = regulator_enable(afe->regulator);
 541         if (ret) {
 542                 dev_err(afe->dev, "Unable to enable regulator\n");
 543                 return ret;
 544         }
 545
 546         ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
 547                            AFE440X_CONTROL0_SW_RESET);
 548         if (ret) {
 549                 dev_err(afe->dev, "Unable to reset device\n");
 550                 goto err_disable_reg;
 551         }
 552
 553         ret = regmap_multi_reg_write(afe->regmap, afe4403_reg_sequences,
 554                                      ARRAY_SIZE(afe4403_reg_sequences));
 555         if (ret) {
 556                 dev_err(afe->dev, "Unable to set register defaults\n");
 557                 goto err_disable_reg;
 558         }
 559
 560         indio_dev->modes = INDIO_DIRECT_MODE;
 561         indio_dev->dev.parent = afe->dev;
 562         indio_dev->channels = afe4403_channels;
 563         indio_dev->num_channels = ARRAY_SIZE(afe4403_channels);
 564         indio_dev->name = AFE4403_DRIVER_NAME;
 565         indio_dev->info = &afe4403_iio_info;
 566
 567         if (afe->irq > 0) {
 568                 afe->trig = devm_iio_trigger_alloc(afe->dev,
 569                                                    "%s-dev%d",
 570                                                    indio_dev->name,
 571                                                    indio_dev->id);
 572                 if (!afe->trig) {
 573                         dev_err(afe->dev, "Unable to allocate IIO trigger\n");
 574                         ret = -ENOMEM;
 575                         goto err_disable_reg;
 576                 }
 577
 578                 iio_trigger_set_drvdata(afe->trig, indio_dev);
 579
 580                 afe->trig->ops = &afe4403_trigger_ops;
 581                 afe->trig->dev.parent = afe->dev;
 582
 583                 ret = iio_trigger_register(afe->trig);
 584                 if (ret) {
 585                         dev_err(afe->dev, "Unable to register IIO trigger\n");
 586                         goto err_disable_reg;
 587                 }
 588
 589                 ret = devm_request_threaded_irq(afe->dev, afe->irq,
 590                                                 iio_trigger_generic_data_rdy_poll,
 591                                                 NULL, IRQF_ONESHOT,
 592                                                 AFE4403_DRIVER_NAME,
 593                                                 afe->trig);
 594                 if (ret) {
 595                         dev_err(afe->dev, "Unable to request IRQ\n");
 596                         goto err_trig;
 597                 }
 598         }
 599
 600         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 601                                          afe4403_trigger_handler, NULL);
 602         if (ret) {
 603                 dev_err(afe->dev, "Unable to setup buffer\n");
 604                 goto err_trig;
 605         }
 606
 607         ret = iio_device_register(indio_dev);
 608         if (ret) {
 609                 dev_err(afe->dev, "Unable to register IIO device\n");
 610                 goto err_buff;
 611         }
 612
 613         return 0;
 614
 615 err_buff:
 616         iio_triggered_buffer_cleanup(indio_dev);
 617 err_trig:
 618         if (afe->irq > 0)
 619                 iio_trigger_unregister(afe->trig);
 620 err_disable_reg:
 621         regulator_disable(afe->regulator);
 622
 623         return ret;
 624 }
 625
 626 static int afe4403_remove(struct spi_device *spi)
 627 {
 628         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 629         struct afe4403_data *afe = iio_priv(indio_dev);
 630         int ret;
 631
 632         iio_device_unregister(indio_dev);
 633
 634         iio_triggered_buffer_cleanup(indio_dev);
 635
 636         if (afe->irq > 0)
 637                 iio_trigger_unregister(afe->trig);
 638
 639         ret = regulator_disable(afe->regulator);
 640         if (ret) {
 641                 dev_err(afe->dev, "Unable to disable regulator\n");
 642                 return ret;
 643         }
 644
 645         return 0;
 646 }
 647
 648 static const struct spi_device_id afe4403_ids[] = {
 649         { "afe4403", 0 },
 650         { /* sentinel */ }
 651 };
 652 MODULE_DEVICE_TABLE(spi, afe4403_ids);
 653
 654 static struct spi_driver afe4403_spi_driver = {
 655         .driver = {
 656                 .name = AFE4403_DRIVER_NAME,
 657                 .of_match_table = afe4403_of_match,
 658                 .pm = &afe4403_pm_ops,
 659         },
 660         .probe = afe4403_probe,
 661         .remove = afe4403_remove,
 662         .id_table = afe4403_ids,
 663 };
 664 module_spi_driver(afe4403_spi_driver);
 665
 666 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 667 MODULE_DESCRIPTION("TI AFE4403 Heart Rate Monitor and Pulse Oximeter AFE");
 668 MODULE_LICENSE("GPL v2");