drivers/iio/health/afe4403.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * AFE4403 Heart Rate Monitors and Low-Cost Pulse Oximeters
   4  *
   5  * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
   6  *      Andrew F. Davis <afd@ti.com>
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/err.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/regmap.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/sysfs.h>
  17 #include <linux/regulator/consumer.h>
  18
  19 #include <linux/iio/iio.h>
  20 #include <linux/iio/sysfs.h>
  21 #include <linux/iio/buffer.h>
  22 #include <linux/iio/trigger.h>
  23 #include <linux/iio/triggered_buffer.h>
  24 #include <linux/iio/trigger_consumer.h>
  25
  26 #include <asm/unaligned.h>
  27
  28 #include "afe440x.h"
  29
  30 #define AFE4403_DRIVER_NAME             "afe4403"
  31
  32 /* AFE4403 Registers */
  33 #define AFE4403_TIAGAIN                 0x20
  34 #define AFE4403_TIA_AMB_GAIN            0x21
  35
  36 enum afe4403_fields {
  37         /* Gains */
  38         F_RF_LED1, F_CF_LED1,
  39         F_RF_LED, F_CF_LED,
  40
  41         /* LED Current */
  42         F_ILED1, F_ILED2,
  43
  44         /* sentinel */
  45         F_MAX_FIELDS
  46 };
  47
  48 static const struct reg_field afe4403_reg_fields[] = {
  49         /* Gains */
  50         [F_RF_LED1]     = REG_FIELD(AFE4403_TIAGAIN, 0, 2),
  51         [F_CF_LED1]     = REG_FIELD(AFE4403_TIAGAIN, 3, 7),
  52         [F_RF_LED]      = REG_FIELD(AFE4403_TIA_AMB_GAIN, 0, 2),
  53         [F_CF_LED]      = REG_FIELD(AFE4403_TIA_AMB_GAIN, 3, 7),
  54         /* LED Current */
  55         [F_ILED1]       = REG_FIELD(AFE440X_LEDCNTRL, 0, 7),
  56         [F_ILED2]       = REG_FIELD(AFE440X_LEDCNTRL, 8, 15),
  57 };
  58
  59 /**
  60  * struct afe4403_data - AFE4403 device instance data
  61  * @dev: Device structure
  62  * @spi: SPI device handle
  63  * @regmap: Register map of the device
  64  * @fields: Register fields of the device
  65  * @regulator: Pointer to the regulator for the IC
  66  * @trig: IIO trigger for this device
  67  * @irq: ADC_RDY line interrupt number
  68  */
  69 struct afe4403_data {
  70         struct device *dev;
  71         struct spi_device *spi;
  72         struct regmap *regmap;
  73         struct regmap_field *fields[F_MAX_FIELDS];
  74         struct regulator *regulator;
  75         struct iio_trigger *trig;
  76         int irq;
  77 };
  78
  79 enum afe4403_chan_id {
  80         LED2 = 1,
  81         ALED2,
  82         LED1,
  83         ALED1,
  84         LED2_ALED2,
  85         LED1_ALED1,
  86 };
  87
  88 static const unsigned int afe4403_channel_values[] = {
  89         [LED2] = AFE440X_LED2VAL,
  90         [ALED2] = AFE440X_ALED2VAL,
  91         [LED1] = AFE440X_LED1VAL,
  92         [ALED1] = AFE440X_ALED1VAL,
  93         [LED2_ALED2] = AFE440X_LED2_ALED2VAL,
  94         [LED1_ALED1] = AFE440X_LED1_ALED1VAL,
  95 };
  96
  97 static const unsigned int afe4403_channel_leds[] = {
  98         [LED2] = F_ILED2,
  99         [LED1] = F_ILED1,
 100 };
 101
 102 static const struct iio_chan_spec afe4403_channels[] = {
 103         /* ADC values */
 104         AFE440X_INTENSITY_CHAN(LED2, 0),
 105         AFE440X_INTENSITY_CHAN(ALED2, 0),
 106         AFE440X_INTENSITY_CHAN(LED1, 0),
 107         AFE440X_INTENSITY_CHAN(ALED1, 0),
 108         AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
 109         AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
 110         /* LED current */
 111         AFE440X_CURRENT_CHAN(LED2),
 112         AFE440X_CURRENT_CHAN(LED1),
 113 };
 114
 115 static const struct afe440x_val_table afe4403_res_table[] = {
 116         { 500000 }, { 250000 }, { 100000 }, { 50000 },
 117         { 25000 }, { 10000 }, { 1000000 }, { 0 },
 118 };
 119 AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4403_res_table);
 120
 121 static const struct afe440x_val_table afe4403_cap_table[] = {
 122         { 0, 5000 }, { 0, 10000 }, { 0, 20000 }, { 0, 25000 },
 123         { 0, 30000 }, { 0, 35000 }, { 0, 45000 }, { 0, 50000 },
 124         { 0, 55000 }, { 0, 60000 }, { 0, 70000 }, { 0, 75000 },
 125         { 0, 80000 }, { 0, 85000 }, { 0, 95000 }, { 0, 100000 },
 126         { 0, 155000 }, { 0, 160000 }, { 0, 170000 }, { 0, 175000 },
 127         { 0, 180000 }, { 0, 185000 }, { 0, 195000 }, { 0, 200000 },
 128         { 0, 205000 }, { 0, 210000 }, { 0, 220000 }, { 0, 225000 },
 129         { 0, 230000 }, { 0, 235000 }, { 0, 245000 }, { 0, 250000 },
 130 };
 131 AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4403_cap_table);
 132
 133 static ssize_t afe440x_show_register(struct device *dev,
 134                                      struct device_attribute *attr,
 135                                      char *buf)
 136 {
 137         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 138         struct afe4403_data *afe = iio_priv(indio_dev);
 139         struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
 140         unsigned int reg_val;
 141         int vals[2];
 142         int ret;
 143
 144         ret = regmap_field_read(afe->fields[afe440x_attr->field], &reg_val);
 145         if (ret)
 146                 return ret;
 147
 148         if (reg_val >= afe440x_attr->table_size)
 149                 return -EINVAL;
 150
 151         vals[0] = afe440x_attr->val_table[reg_val].integer;
 152         vals[1] = afe440x_attr->val_table[reg_val].fract;
 153
 154         return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
 155 }
 156
 157 static ssize_t afe440x_store_register(struct device *dev,
 158                                       struct device_attribute *attr,
 159                                       const char *buf, size_t count)
 160 {
 161         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 162         struct afe4403_data *afe = iio_priv(indio_dev);
 163         struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
 164         int val, integer, fract, ret;
 165
 166         ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
 167         if (ret)
 168                 return ret;
 169
 170         for (val = 0; val < afe440x_attr->table_size; val++)
 171                 if (afe440x_attr->val_table[val].integer == integer &&
 172                     afe440x_attr->val_table[val].fract == fract)
 173                         break;
 174         if (val == afe440x_attr->table_size)
 175                 return -EINVAL;
 176
 177         ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
 178         if (ret)
 179                 return ret;
 180
 181         return count;
 182 }
 183
 184 static AFE440X_ATTR(in_intensity1_resistance, F_RF_LED, afe4403_res_table);
 185 static AFE440X_ATTR(in_intensity1_capacitance, F_CF_LED, afe4403_cap_table);
 186
 187 static AFE440X_ATTR(in_intensity2_resistance, F_RF_LED, afe4403_res_table);
 188 static AFE440X_ATTR(in_intensity2_capacitance, F_CF_LED, afe4403_cap_table);
 189
 190 static AFE440X_ATTR(in_intensity3_resistance, F_RF_LED1, afe4403_res_table);
 191 static AFE440X_ATTR(in_intensity3_capacitance, F_CF_LED1, afe4403_cap_table);
 192
 193 static AFE440X_ATTR(in_intensity4_resistance, F_RF_LED1, afe4403_res_table);
 194 static AFE440X_ATTR(in_intensity4_capacitance, F_CF_LED1, afe4403_cap_table);
 195
 196 static struct attribute *afe440x_attributes[] = {
 197         &dev_attr_in_intensity_resistance_available.attr,
 198         &dev_attr_in_intensity_capacitance_available.attr,
 199         &afe440x_attr_in_intensity1_resistance.dev_attr.attr,
 200         &afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
 201         &afe440x_attr_in_intensity2_resistance.dev_attr.attr,
 202         &afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
 203         &afe440x_attr_in_intensity3_resistance.dev_attr.attr,
 204         &afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
 205         &afe440x_attr_in_intensity4_resistance.dev_attr.attr,
 206         &afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
 207         NULL
 208 };
 209
 210 static const struct attribute_group afe440x_attribute_group = {
 211         .attrs = afe440x_attributes
 212 };
 213
 214 static int afe4403_read(struct afe4403_data *afe, unsigned int reg, u32 *val)
 215 {
 216         u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
 217         u8 rx[3];
 218         int ret;
 219
 220         /* Enable reading from the device */
 221         ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
 222         if (ret)
 223                 return ret;
 224
 225         ret = spi_write_then_read(afe->spi, &reg, 1, rx, sizeof(rx));
 226         if (ret)
 227                 return ret;
 228
 229         *val = get_unaligned_be24(&rx[0]);
 230
 231         /* Disable reading from the device */
 232         tx[3] = AFE440X_CONTROL0_WRITE;
 233         ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
 234         if (ret)
 235                 return ret;
 236
 237         return 0;
 238 }
 239
 240 static int afe4403_read_raw(struct iio_dev *indio_dev,
 241                             struct iio_chan_spec const *chan,
 242                             int *val, int *val2, long mask)
 243 {
 244         struct afe4403_data *afe = iio_priv(indio_dev);
 245         unsigned int reg = afe4403_channel_values[chan->address];
 246         unsigned int field = afe4403_channel_leds[chan->address];
 247         int ret;
 248
 249         switch (chan->type) {
 250         case IIO_INTENSITY:
 251                 switch (mask) {
 252                 case IIO_CHAN_INFO_RAW:
 253                         ret = afe4403_read(afe, reg, val);
 254                         if (ret)
 255                                 return ret;
 256                         return IIO_VAL_INT;
 257                 }
 258                 break;
 259         case IIO_CURRENT:
 260                 switch (mask) {
 261                 case IIO_CHAN_INFO_RAW:
 262                         ret = regmap_field_read(afe->fields[field], val);
 263                         if (ret)
 264                                 return ret;
 265                         return IIO_VAL_INT;
 266                 case IIO_CHAN_INFO_SCALE:
 267                         *val = 0;
 268                         *val2 = 800000;
 269                         return IIO_VAL_INT_PLUS_MICRO;
 270                 }
 271                 break;
 272         default:
 273                 break;
 274         }
 275
 276         return -EINVAL;
 277 }
 278
 279 static int afe4403_write_raw(struct iio_dev *indio_dev,
 280                              struct iio_chan_spec const *chan,
 281                              int val, int val2, long mask)
 282 {
 283         struct afe4403_data *afe = iio_priv(indio_dev);
 284         unsigned int field = afe4403_channel_leds[chan->address];
 285
 286         switch (chan->type) {
 287         case IIO_CURRENT:
 288                 switch (mask) {
 289                 case IIO_CHAN_INFO_RAW:
 290                         return regmap_field_write(afe->fields[field], val);
 291                 }
 292                 break;
 293         default:
 294                 break;
 295         }
 296
 297         return -EINVAL;
 298 }
 299
 300 static const struct iio_info afe4403_iio_info = {
 301         .attrs = &afe440x_attribute_group,
 302         .read_raw = afe4403_read_raw,
 303         .write_raw = afe4403_write_raw,
 304 };
 305
 306 static irqreturn_t afe4403_trigger_handler(int irq, void *private)
 307 {
 308         struct iio_poll_func *pf = private;
 309         struct iio_dev *indio_dev = pf->indio_dev;
 310         struct afe4403_data *afe = iio_priv(indio_dev);
 311         int ret, bit, i = 0;
 312         s32 buffer[8];
 313         u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
 314         u8 rx[3];
 315
 316         /* Enable reading from the device */
 317         ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
 318         if (ret)
 319                 goto err;
 320
 321         for_each_set_bit(bit, indio_dev->active_scan_mask,
 322                          indio_dev->masklength) {
 323                 ret = spi_write_then_read(afe->spi,
 324                                           &afe4403_channel_values[bit], 1,
 325                                           rx, sizeof(rx));
 326                 if (ret)
 327                         goto err;
 328
 329                 buffer[i++] = get_unaligned_be24(&rx[0]);
 330         }
 331
 332         /* Disable reading from the device */
 333         tx[3] = AFE440X_CONTROL0_WRITE;
 334         ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
 335         if (ret)
 336                 goto err;
 337
 338         iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp);
 339 err:
 340         iio_trigger_notify_done(indio_dev->trig);
 341
 342         return IRQ_HANDLED;
 343 }
 344
 345 static const struct iio_trigger_ops afe4403_trigger_ops = {
 346 };
 347
 348 #define AFE4403_TIMING_PAIRS                    \
 349         { AFE440X_LED2STC,      0x000050 },     \
 350         { AFE440X_LED2ENDC,     0x0003e7 },     \
 351         { AFE440X_LED1LEDSTC,   0x0007d0 },     \
 352         { AFE440X_LED1LEDENDC,  0x000bb7 },     \
 353         { AFE440X_ALED2STC,     0x000438 },     \
 354         { AFE440X_ALED2ENDC,    0x0007cf },     \
 355         { AFE440X_LED1STC,      0x000820 },     \
 356         { AFE440X_LED1ENDC,     0x000bb7 },     \
 357         { AFE440X_LED2LEDSTC,   0x000000 },     \
 358         { AFE440X_LED2LEDENDC,  0x0003e7 },     \
 359         { AFE440X_ALED1STC,     0x000c08 },     \
 360         { AFE440X_ALED1ENDC,    0x000f9f },     \
 361         { AFE440X_LED2CONVST,   0x0003ef },     \
 362         { AFE440X_LED2CONVEND,  0x0007cf },     \
 363         { AFE440X_ALED2CONVST,  0x0007d7 },     \
 364         { AFE440X_ALED2CONVEND, 0x000bb7 },     \
 365         { AFE440X_LED1CONVST,   0x000bbf },     \
 366         { AFE440X_LED1CONVEND,  0x009c3f },     \
 367         { AFE440X_ALED1CONVST,  0x000fa7 },     \
 368         { AFE440X_ALED1CONVEND, 0x001387 },     \
 369         { AFE440X_ADCRSTSTCT0,  0x0003e8 },     \
 370         { AFE440X_ADCRSTENDCT0, 0x0003eb },     \
 371         { AFE440X_ADCRSTSTCT1,  0x0007d0 },     \
 372         { AFE440X_ADCRSTENDCT1, 0x0007d3 },     \
 373         { AFE440X_ADCRSTSTCT2,  0x000bb8 },     \
 374         { AFE440X_ADCRSTENDCT2, 0x000bbb },     \
 375         { AFE440X_ADCRSTSTCT3,  0x000fa0 },     \
 376         { AFE440X_ADCRSTENDCT3, 0x000fa3 },     \
 377         { AFE440X_PRPCOUNT,     0x009c3f },     \
 378         { AFE440X_PDNCYCLESTC,  0x001518 },     \
 379         { AFE440X_PDNCYCLEENDC, 0x00991f }
 380
 381 static const struct reg_sequence afe4403_reg_sequences[] = {
 382         AFE4403_TIMING_PAIRS,
 383         { AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
 384         { AFE4403_TIAGAIN, AFE440X_TIAGAIN_ENSEPGAIN },
 385 };
 386
 387 static const struct regmap_range afe4403_yes_ranges[] = {
 388         regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
 389 };
 390
 391 static const struct regmap_access_table afe4403_volatile_table = {
 392         .yes_ranges = afe4403_yes_ranges,
 393         .n_yes_ranges = ARRAY_SIZE(afe4403_yes_ranges),
 394 };
 395
 396 static const struct regmap_config afe4403_regmap_config = {
 397         .reg_bits = 8,
 398         .val_bits = 24,
 399
 400         .max_register = AFE440X_PDNCYCLEENDC,
 401         .cache_type = REGCACHE_RBTREE,
 402         .volatile_table = &afe4403_volatile_table,
 403 };
 404
 405 static const struct of_device_id afe4403_of_match[] = {
 406         { .compatible = "ti,afe4403", },
 407         { /* sentinel */ }
 408 };
 409 MODULE_DEVICE_TABLE(of, afe4403_of_match);
 410
 411 static int __maybe_unused afe4403_suspend(struct device *dev)
 412 {
 413         struct iio_dev *indio_dev = spi_get_drvdata(to_spi_device(dev));
 414         struct afe4403_data *afe = iio_priv(indio_dev);
 415         int ret;
 416
 417         ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
 418                                  AFE440X_CONTROL2_PDN_AFE,
 419                                  AFE440X_CONTROL2_PDN_AFE);
 420         if (ret)
 421                 return ret;
 422
 423         ret = regulator_disable(afe->regulator);
 424         if (ret) {
 425                 dev_err(dev, "Unable to disable regulator\n");
 426                 return ret;
 427         }
 428
 429         return 0;
 430 }
 431
 432 static int __maybe_unused afe4403_resume(struct device *dev)
 433 {
 434         struct iio_dev *indio_dev = spi_get_drvdata(to_spi_device(dev));
 435         struct afe4403_data *afe = iio_priv(indio_dev);
 436         int ret;
 437
 438         ret = regulator_enable(afe->regulator);
 439         if (ret) {
 440                 dev_err(dev, "Unable to enable regulator\n");
 441                 return ret;
 442         }
 443
 444         ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
 445                                  AFE440X_CONTROL2_PDN_AFE, 0);
 446         if (ret)
 447                 return ret;
 448
 449         return 0;
 450 }
 451
 452 static SIMPLE_DEV_PM_OPS(afe4403_pm_ops, afe4403_suspend, afe4403_resume);
 453
 454 static int afe4403_probe(struct spi_device *spi)
 455 {
 456         struct iio_dev *indio_dev;
 457         struct afe4403_data *afe;
 458         int i, ret;
 459
 460         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*afe));
 461         if (!indio_dev)
 462                 return -ENOMEM;
 463
 464         afe = iio_priv(indio_dev);
 465         spi_set_drvdata(spi, indio_dev);
 466
 467         afe->dev = &spi->dev;
 468         afe->spi = spi;
 469         afe->irq = spi->irq;
 470
 471         afe->regmap = devm_regmap_init_spi(spi, &afe4403_regmap_config);
 472         if (IS_ERR(afe->regmap)) {
 473                 dev_err(afe->dev, "Unable to allocate register map\n");
 474                 return PTR_ERR(afe->regmap);
 475         }
 476
 477         for (i = 0; i < F_MAX_FIELDS; i++) {
 478                 afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
 479                                                          afe4403_reg_fields[i]);
 480                 if (IS_ERR(afe->fields[i])) {
 481                         dev_err(afe->dev, "Unable to allocate regmap fields\n");
 482                         return PTR_ERR(afe->fields[i]);
 483                 }
 484         }
 485
 486         afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
 487         if (IS_ERR(afe->regulator)) {
 488                 dev_err(afe->dev, "Unable to get regulator\n");
 489                 return PTR_ERR(afe->regulator);
 490         }
 491         ret = regulator_enable(afe->regulator);
 492         if (ret) {
 493                 dev_err(afe->dev, "Unable to enable regulator\n");
 494                 return ret;
 495         }
 496
 497         ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
 498                            AFE440X_CONTROL0_SW_RESET);
 499         if (ret) {
 500                 dev_err(afe->dev, "Unable to reset device\n");
 501                 goto err_disable_reg;
 502         }
 503
 504         ret = regmap_multi_reg_write(afe->regmap, afe4403_reg_sequences,
 505                                      ARRAY_SIZE(afe4403_reg_sequences));
 506         if (ret) {
 507                 dev_err(afe->dev, "Unable to set register defaults\n");
 508                 goto err_disable_reg;
 509         }
 510
 511         indio_dev->modes = INDIO_DIRECT_MODE;
 512         indio_dev->dev.parent = afe->dev;
 513         indio_dev->channels = afe4403_channels;
 514         indio_dev->num_channels = ARRAY_SIZE(afe4403_channels);
 515         indio_dev->name = AFE4403_DRIVER_NAME;
 516         indio_dev->info = &afe4403_iio_info;
 517
 518         if (afe->irq > 0) {
 519                 afe->trig = devm_iio_trigger_alloc(afe->dev,
 520                                                    "%s-dev%d",
 521                                                    indio_dev->name,
 522                                                    indio_dev->id);
 523                 if (!afe->trig) {
 524                         dev_err(afe->dev, "Unable to allocate IIO trigger\n");
 525                         ret = -ENOMEM;
 526                         goto err_disable_reg;
 527                 }
 528
 529                 iio_trigger_set_drvdata(afe->trig, indio_dev);
 530
 531                 afe->trig->ops = &afe4403_trigger_ops;
 532                 afe->trig->dev.parent = afe->dev;
 533
 534                 ret = iio_trigger_register(afe->trig);
 535                 if (ret) {
 536                         dev_err(afe->dev, "Unable to register IIO trigger\n");
 537                         goto err_disable_reg;
 538                 }
 539
 540                 ret = devm_request_threaded_irq(afe->dev, afe->irq,
 541                                                 iio_trigger_generic_data_rdy_poll,
 542                                                 NULL, IRQF_ONESHOT,
 543                                                 AFE4403_DRIVER_NAME,
 544                                                 afe->trig);
 545                 if (ret) {
 546                         dev_err(afe->dev, "Unable to request IRQ\n");
 547                         goto err_trig;
 548                 }
 549         }
 550
 551         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 552                                          afe4403_trigger_handler, NULL);
 553         if (ret) {
 554                 dev_err(afe->dev, "Unable to setup buffer\n");
 555                 goto err_trig;
 556         }
 557
 558         ret = iio_device_register(indio_dev);
 559         if (ret) {
 560                 dev_err(afe->dev, "Unable to register IIO device\n");
 561                 goto err_buff;
 562         }
 563
 564         return 0;
 565
 566 err_buff:
 567         iio_triggered_buffer_cleanup(indio_dev);
 568 err_trig:
 569         if (afe->irq > 0)
 570                 iio_trigger_unregister(afe->trig);
 571 err_disable_reg:
 572         regulator_disable(afe->regulator);
 573
 574         return ret;
 575 }
 576
 577 static int afe4403_remove(struct spi_device *spi)
 578 {
 579         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 580         struct afe4403_data *afe = iio_priv(indio_dev);
 581         int ret;
 582
 583         iio_device_unregister(indio_dev);
 584
 585         iio_triggered_buffer_cleanup(indio_dev);
 586
 587         if (afe->irq > 0)
 588                 iio_trigger_unregister(afe->trig);
 589
 590         ret = regulator_disable(afe->regulator);
 591         if (ret) {
 592                 dev_err(afe->dev, "Unable to disable regulator\n");
 593                 return ret;
 594         }
 595
 596         return 0;
 597 }
 598
 599 static const struct spi_device_id afe4403_ids[] = {
 600         { "afe4403", 0 },
 601         { /* sentinel */ }
 602 };
 603 MODULE_DEVICE_TABLE(spi, afe4403_ids);
 604
 605 static struct spi_driver afe4403_spi_driver = {
 606         .driver = {
 607                 .name = AFE4403_DRIVER_NAME,
 608                 .of_match_table = afe4403_of_match,
 609                 .pm = &afe4403_pm_ops,
 610         },
 611         .probe = afe4403_probe,
 612         .remove = afe4403_remove,
 613         .id_table = afe4403_ids,
 614 };
 615 module_spi_driver(afe4403_spi_driver);
 616
 617 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 618 MODULE_DESCRIPTION("TI AFE4403 Heart Rate Monitor and Pulse Oximeter AFE");
 619 MODULE_LICENSE("GPL v2");