drivers/iio/health/afe4404.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * AFE4404 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/i2c.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/regmap.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 "afe440x.h"
  27
  28 #define AFE4404_DRIVER_NAME             "afe4404"
  29
  30 /* AFE4404 registers */
  31 #define AFE4404_TIA_GAIN_SEP            0x20
  32 #define AFE4404_TIA_GAIN                0x21
  33 #define AFE4404_PROG_TG_STC             0x34
  34 #define AFE4404_PROG_TG_ENDC            0x35
  35 #define AFE4404_LED3LEDSTC              0x36
  36 #define AFE4404_LED3LEDENDC             0x37
  37 #define AFE4404_CLKDIV_PRF              0x39
  38 #define AFE4404_OFFDAC                  0x3a
  39 #define AFE4404_DEC                     0x3d
  40 #define AFE4404_AVG_LED2_ALED2VAL       0x3f
  41 #define AFE4404_AVG_LED1_ALED1VAL       0x40
  42
  43 /* AFE4404 CONTROL2 register fields */
  44 #define AFE440X_CONTROL2_OSC_ENABLE     BIT(9)
  45
  46 enum afe4404_fields {
  47         /* Gains */
  48         F_TIA_GAIN_SEP, F_TIA_CF_SEP,
  49         F_TIA_GAIN, TIA_CF,
  50
  51         /* LED Current */
  52         F_ILED1, F_ILED2, F_ILED3,
  53
  54         /* Offset DAC */
  55         F_OFFDAC_AMB2, F_OFFDAC_LED1, F_OFFDAC_AMB1, F_OFFDAC_LED2,
  56
  57         /* sentinel */
  58         F_MAX_FIELDS
  59 };
  60
  61 static const struct reg_field afe4404_reg_fields[] = {
  62         /* Gains */
  63         [F_TIA_GAIN_SEP]        = REG_FIELD(AFE4404_TIA_GAIN_SEP, 0, 2),
  64         [F_TIA_CF_SEP]          = REG_FIELD(AFE4404_TIA_GAIN_SEP, 3, 5),
  65         [F_TIA_GAIN]            = REG_FIELD(AFE4404_TIA_GAIN, 0, 2),
  66         [TIA_CF]                = REG_FIELD(AFE4404_TIA_GAIN, 3, 5),
  67         /* LED Current */
  68         [F_ILED1]               = REG_FIELD(AFE440X_LEDCNTRL, 0, 5),
  69         [F_ILED2]               = REG_FIELD(AFE440X_LEDCNTRL, 6, 11),
  70         [F_ILED3]               = REG_FIELD(AFE440X_LEDCNTRL, 12, 17),
  71         /* Offset DAC */
  72         [F_OFFDAC_AMB2]         = REG_FIELD(AFE4404_OFFDAC, 0, 4),
  73         [F_OFFDAC_LED1]         = REG_FIELD(AFE4404_OFFDAC, 5, 9),
  74         [F_OFFDAC_AMB1]         = REG_FIELD(AFE4404_OFFDAC, 10, 14),
  75         [F_OFFDAC_LED2]         = REG_FIELD(AFE4404_OFFDAC, 15, 19),
  76 };
  77
  78 /**
  79  * struct afe4404_data - AFE4404 device instance data
  80  * @dev: Device structure
  81  * @regmap: Register map of the device
  82  * @fields: Register fields of the device
  83  * @regulator: Pointer to the regulator for the IC
  84  * @trig: IIO trigger for this device
  85  * @irq: ADC_RDY line interrupt number
  86  */
  87 struct afe4404_data {
  88         struct device *dev;
  89         struct regmap *regmap;
  90         struct regmap_field *fields[F_MAX_FIELDS];
  91         struct regulator *regulator;
  92         struct iio_trigger *trig;
  93         int irq;
  94 };
  95
  96 enum afe4404_chan_id {
  97         LED2 = 1,
  98         ALED2,
  99         LED1,
 100         ALED1,
 101         LED2_ALED2,
 102         LED1_ALED1,
 103 };
 104
 105 static const unsigned int afe4404_channel_values[] = {
 106         [LED2] = AFE440X_LED2VAL,
 107         [ALED2] = AFE440X_ALED2VAL,
 108         [LED1] = AFE440X_LED1VAL,
 109         [ALED1] = AFE440X_ALED1VAL,
 110         [LED2_ALED2] = AFE440X_LED2_ALED2VAL,
 111         [LED1_ALED1] = AFE440X_LED1_ALED1VAL,
 112 };
 113
 114 static const unsigned int afe4404_channel_leds[] = {
 115         [LED2] = F_ILED2,
 116         [ALED2] = F_ILED3,
 117         [LED1] = F_ILED1,
 118 };
 119
 120 static const unsigned int afe4404_channel_offdacs[] = {
 121         [LED2] = F_OFFDAC_LED2,
 122         [ALED2] = F_OFFDAC_AMB2,
 123         [LED1] = F_OFFDAC_LED1,
 124         [ALED1] = F_OFFDAC_AMB1,
 125 };
 126
 127 static const struct iio_chan_spec afe4404_channels[] = {
 128         /* ADC values */
 129         AFE440X_INTENSITY_CHAN(LED2, BIT(IIO_CHAN_INFO_OFFSET)),
 130         AFE440X_INTENSITY_CHAN(ALED2, BIT(IIO_CHAN_INFO_OFFSET)),
 131         AFE440X_INTENSITY_CHAN(LED1, BIT(IIO_CHAN_INFO_OFFSET)),
 132         AFE440X_INTENSITY_CHAN(ALED1, BIT(IIO_CHAN_INFO_OFFSET)),
 133         AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
 134         AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
 135         /* LED current */
 136         AFE440X_CURRENT_CHAN(LED2),
 137         AFE440X_CURRENT_CHAN(ALED2),
 138         AFE440X_CURRENT_CHAN(LED1),
 139 };
 140
 141 static const struct afe440x_val_table afe4404_res_table[] = {
 142         { .integer = 500000, .fract = 0 },
 143         { .integer = 250000, .fract = 0 },
 144         { .integer = 100000, .fract = 0 },
 145         { .integer = 50000, .fract = 0 },
 146         { .integer = 25000, .fract = 0 },
 147         { .integer = 10000, .fract = 0 },
 148         { .integer = 1000000, .fract = 0 },
 149         { .integer = 2000000, .fract = 0 },
 150 };
 151 AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4404_res_table);
 152
 153 static const struct afe440x_val_table afe4404_cap_table[] = {
 154         { .integer = 0, .fract = 5000 },
 155         { .integer = 0, .fract = 2500 },
 156         { .integer = 0, .fract = 10000 },
 157         { .integer = 0, .fract = 7500 },
 158         { .integer = 0, .fract = 20000 },
 159         { .integer = 0, .fract = 17500 },
 160         { .integer = 0, .fract = 25000 },
 161         { .integer = 0, .fract = 22500 },
 162 };
 163 AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4404_cap_table);
 164
 165 static ssize_t afe440x_show_register(struct device *dev,
 166                                      struct device_attribute *attr,
 167                                      char *buf)
 168 {
 169         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 170         struct afe4404_data *afe = iio_priv(indio_dev);
 171         struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
 172         unsigned int reg_val;
 173         int vals[2];
 174         int ret;
 175
 176         ret = regmap_field_read(afe->fields[afe440x_attr->field], &reg_val);
 177         if (ret)
 178                 return ret;
 179
 180         if (reg_val >= afe440x_attr->table_size)
 181                 return -EINVAL;
 182
 183         vals[0] = afe440x_attr->val_table[reg_val].integer;
 184         vals[1] = afe440x_attr->val_table[reg_val].fract;
 185
 186         return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
 187 }
 188
 189 static ssize_t afe440x_store_register(struct device *dev,
 190                                       struct device_attribute *attr,
 191                                       const char *buf, size_t count)
 192 {
 193         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 194         struct afe4404_data *afe = iio_priv(indio_dev);
 195         struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
 196         int val, integer, fract, ret;
 197
 198         ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
 199         if (ret)
 200                 return ret;
 201
 202         for (val = 0; val < afe440x_attr->table_size; val++)
 203                 if (afe440x_attr->val_table[val].integer == integer &&
 204                     afe440x_attr->val_table[val].fract == fract)
 205                         break;
 206         if (val == afe440x_attr->table_size)
 207                 return -EINVAL;
 208
 209         ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
 210         if (ret)
 211                 return ret;
 212
 213         return count;
 214 }
 215
 216 static AFE440X_ATTR(in_intensity1_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
 217 static AFE440X_ATTR(in_intensity1_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
 218
 219 static AFE440X_ATTR(in_intensity2_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
 220 static AFE440X_ATTR(in_intensity2_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
 221
 222 static AFE440X_ATTR(in_intensity3_resistance, F_TIA_GAIN, afe4404_res_table);
 223 static AFE440X_ATTR(in_intensity3_capacitance, TIA_CF, afe4404_cap_table);
 224
 225 static AFE440X_ATTR(in_intensity4_resistance, F_TIA_GAIN, afe4404_res_table);
 226 static AFE440X_ATTR(in_intensity4_capacitance, TIA_CF, afe4404_cap_table);
 227
 228 static struct attribute *afe440x_attributes[] = {
 229         &dev_attr_in_intensity_resistance_available.attr,
 230         &dev_attr_in_intensity_capacitance_available.attr,
 231         &afe440x_attr_in_intensity1_resistance.dev_attr.attr,
 232         &afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
 233         &afe440x_attr_in_intensity2_resistance.dev_attr.attr,
 234         &afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
 235         &afe440x_attr_in_intensity3_resistance.dev_attr.attr,
 236         &afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
 237         &afe440x_attr_in_intensity4_resistance.dev_attr.attr,
 238         &afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
 239         NULL
 240 };
 241
 242 static const struct attribute_group afe440x_attribute_group = {
 243         .attrs = afe440x_attributes
 244 };
 245
 246 static int afe4404_read_raw(struct iio_dev *indio_dev,
 247                             struct iio_chan_spec const *chan,
 248                             int *val, int *val2, long mask)
 249 {
 250         struct afe4404_data *afe = iio_priv(indio_dev);
 251         unsigned int value_reg = afe4404_channel_values[chan->address];
 252         unsigned int led_field = afe4404_channel_leds[chan->address];
 253         unsigned int offdac_field = afe4404_channel_offdacs[chan->address];
 254         int ret;
 255
 256         switch (chan->type) {
 257         case IIO_INTENSITY:
 258                 switch (mask) {
 259                 case IIO_CHAN_INFO_RAW:
 260                         ret = regmap_read(afe->regmap, value_reg, val);
 261                         if (ret)
 262                                 return ret;
 263                         return IIO_VAL_INT;
 264                 case IIO_CHAN_INFO_OFFSET:
 265                         ret = regmap_field_read(afe->fields[offdac_field], val);
 266                         if (ret)
 267                                 return ret;
 268                         return IIO_VAL_INT;
 269                 }
 270                 break;
 271         case IIO_CURRENT:
 272                 switch (mask) {
 273                 case IIO_CHAN_INFO_RAW:
 274                         ret = regmap_field_read(afe->fields[led_field], val);
 275                         if (ret)
 276                                 return ret;
 277                         return IIO_VAL_INT;
 278                 case IIO_CHAN_INFO_SCALE:
 279                         *val = 0;
 280                         *val2 = 800000;
 281                         return IIO_VAL_INT_PLUS_MICRO;
 282                 }
 283                 break;
 284         default:
 285                 break;
 286         }
 287
 288         return -EINVAL;
 289 }
 290
 291 static int afe4404_write_raw(struct iio_dev *indio_dev,
 292                              struct iio_chan_spec const *chan,
 293                              int val, int val2, long mask)
 294 {
 295         struct afe4404_data *afe = iio_priv(indio_dev);
 296         unsigned int led_field = afe4404_channel_leds[chan->address];
 297         unsigned int offdac_field = afe4404_channel_offdacs[chan->address];
 298
 299         switch (chan->type) {
 300         case IIO_INTENSITY:
 301                 switch (mask) {
 302                 case IIO_CHAN_INFO_OFFSET:
 303                         return regmap_field_write(afe->fields[offdac_field], val);
 304                 }
 305                 break;
 306         case IIO_CURRENT:
 307                 switch (mask) {
 308                 case IIO_CHAN_INFO_RAW:
 309                         return regmap_field_write(afe->fields[led_field], val);
 310                 }
 311                 break;
 312         default:
 313                 break;
 314         }
 315
 316         return -EINVAL;
 317 }
 318
 319 static const struct iio_info afe4404_iio_info = {
 320         .attrs = &afe440x_attribute_group,
 321         .read_raw = afe4404_read_raw,
 322         .write_raw = afe4404_write_raw,
 323 };
 324
 325 static irqreturn_t afe4404_trigger_handler(int irq, void *private)
 326 {
 327         struct iio_poll_func *pf = private;
 328         struct iio_dev *indio_dev = pf->indio_dev;
 329         struct afe4404_data *afe = iio_priv(indio_dev);
 330         int ret, bit, i = 0;
 331         s32 buffer[10];
 332
 333         for_each_set_bit(bit, indio_dev->active_scan_mask,
 334                          indio_dev->masklength) {
 335                 ret = regmap_read(afe->regmap, afe4404_channel_values[bit],
 336                                   &buffer[i++]);
 337                 if (ret)
 338                         goto err;
 339         }
 340
 341         iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp);
 342 err:
 343         iio_trigger_notify_done(indio_dev->trig);
 344
 345         return IRQ_HANDLED;
 346 }
 347
 348 static const struct iio_trigger_ops afe4404_trigger_ops = {
 349 };
 350
 351 /* Default timings from data-sheet */
 352 #define AFE4404_TIMING_PAIRS                    \
 353         { AFE440X_PRPCOUNT,     39999   },      \
 354         { AFE440X_LED2LEDSTC,   0       },      \
 355         { AFE440X_LED2LEDENDC,  398     },      \
 356         { AFE440X_LED2STC,      80      },      \
 357         { AFE440X_LED2ENDC,     398     },      \
 358         { AFE440X_ADCRSTSTCT0,  5600    },      \
 359         { AFE440X_ADCRSTENDCT0, 5606    },      \
 360         { AFE440X_LED2CONVST,   5607    },      \
 361         { AFE440X_LED2CONVEND,  6066    },      \
 362         { AFE4404_LED3LEDSTC,   400     },      \
 363         { AFE4404_LED3LEDENDC,  798     },      \
 364         { AFE440X_ALED2STC,     480     },      \
 365         { AFE440X_ALED2ENDC,    798     },      \
 366         { AFE440X_ADCRSTSTCT1,  6068    },      \
 367         { AFE440X_ADCRSTENDCT1, 6074    },      \
 368         { AFE440X_ALED2CONVST,  6075    },      \
 369         { AFE440X_ALED2CONVEND, 6534    },      \
 370         { AFE440X_LED1LEDSTC,   800     },      \
 371         { AFE440X_LED1LEDENDC,  1198    },      \
 372         { AFE440X_LED1STC,      880     },      \
 373         { AFE440X_LED1ENDC,     1198    },      \
 374         { AFE440X_ADCRSTSTCT2,  6536    },      \
 375         { AFE440X_ADCRSTENDCT2, 6542    },      \
 376         { AFE440X_LED1CONVST,   6543    },      \
 377         { AFE440X_LED1CONVEND,  7003    },      \
 378         { AFE440X_ALED1STC,     1280    },      \
 379         { AFE440X_ALED1ENDC,    1598    },      \
 380         { AFE440X_ADCRSTSTCT3,  7005    },      \
 381         { AFE440X_ADCRSTENDCT3, 7011    },      \
 382         { AFE440X_ALED1CONVST,  7012    },      \
 383         { AFE440X_ALED1CONVEND, 7471    },      \
 384         { AFE440X_PDNCYCLESTC,  7671    },      \
 385         { AFE440X_PDNCYCLEENDC, 39199   }
 386
 387 static const struct reg_sequence afe4404_reg_sequences[] = {
 388         AFE4404_TIMING_PAIRS,
 389         { AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
 390         { AFE4404_TIA_GAIN_SEP, AFE440X_TIAGAIN_ENSEPGAIN },
 391         { AFE440X_CONTROL2, AFE440X_CONTROL2_OSC_ENABLE },
 392 };
 393
 394 static const struct regmap_range afe4404_yes_ranges[] = {
 395         regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
 396         regmap_reg_range(AFE4404_AVG_LED2_ALED2VAL, AFE4404_AVG_LED1_ALED1VAL),
 397 };
 398
 399 static const struct regmap_access_table afe4404_volatile_table = {
 400         .yes_ranges = afe4404_yes_ranges,
 401         .n_yes_ranges = ARRAY_SIZE(afe4404_yes_ranges),
 402 };
 403
 404 static const struct regmap_config afe4404_regmap_config = {
 405         .reg_bits = 8,
 406         .val_bits = 24,
 407
 408         .max_register = AFE4404_AVG_LED1_ALED1VAL,
 409         .cache_type = REGCACHE_RBTREE,
 410         .volatile_table = &afe4404_volatile_table,
 411 };
 412
 413 static const struct of_device_id afe4404_of_match[] = {
 414         { .compatible = "ti,afe4404", },
 415         { /* sentinel */ }
 416 };
 417 MODULE_DEVICE_TABLE(of, afe4404_of_match);
 418
 419 static int __maybe_unused afe4404_suspend(struct device *dev)
 420 {
 421         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 422         struct afe4404_data *afe = iio_priv(indio_dev);
 423         int ret;
 424
 425         ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
 426                                  AFE440X_CONTROL2_PDN_AFE,
 427                                  AFE440X_CONTROL2_PDN_AFE);
 428         if (ret)
 429                 return ret;
 430
 431         ret = regulator_disable(afe->regulator);
 432         if (ret) {
 433                 dev_err(dev, "Unable to disable regulator\n");
 434                 return ret;
 435         }
 436
 437         return 0;
 438 }
 439
 440 static int __maybe_unused afe4404_resume(struct device *dev)
 441 {
 442         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 443         struct afe4404_data *afe = iio_priv(indio_dev);
 444         int ret;
 445
 446         ret = regulator_enable(afe->regulator);
 447         if (ret) {
 448                 dev_err(dev, "Unable to enable regulator\n");
 449                 return ret;
 450         }
 451
 452         ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
 453                                  AFE440X_CONTROL2_PDN_AFE, 0);
 454         if (ret)
 455                 return ret;
 456
 457         return 0;
 458 }
 459
 460 static SIMPLE_DEV_PM_OPS(afe4404_pm_ops, afe4404_suspend, afe4404_resume);
 461
 462 static int afe4404_probe(struct i2c_client *client,
 463                          const struct i2c_device_id *id)
 464 {
 465         struct iio_dev *indio_dev;
 466         struct afe4404_data *afe;
 467         int i, ret;
 468
 469         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*afe));
 470         if (!indio_dev)
 471                 return -ENOMEM;
 472
 473         afe = iio_priv(indio_dev);
 474         i2c_set_clientdata(client, indio_dev);
 475
 476         afe->dev = &client->dev;
 477         afe->irq = client->irq;
 478
 479         afe->regmap = devm_regmap_init_i2c(client, &afe4404_regmap_config);
 480         if (IS_ERR(afe->regmap)) {
 481                 dev_err(afe->dev, "Unable to allocate register map\n");
 482                 return PTR_ERR(afe->regmap);
 483         }
 484
 485         for (i = 0; i < F_MAX_FIELDS; i++) {
 486                 afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
 487                                                          afe4404_reg_fields[i]);
 488                 if (IS_ERR(afe->fields[i])) {
 489                         dev_err(afe->dev, "Unable to allocate regmap fields\n");
 490                         return PTR_ERR(afe->fields[i]);
 491                 }
 492         }
 493
 494         afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
 495         if (IS_ERR(afe->regulator)) {
 496                 dev_err(afe->dev, "Unable to get regulator\n");
 497                 return PTR_ERR(afe->regulator);
 498         }
 499         ret = regulator_enable(afe->regulator);
 500         if (ret) {
 501                 dev_err(afe->dev, "Unable to enable regulator\n");
 502                 return ret;
 503         }
 504
 505         ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
 506                            AFE440X_CONTROL0_SW_RESET);
 507         if (ret) {
 508                 dev_err(afe->dev, "Unable to reset device\n");
 509                 goto disable_reg;
 510         }
 511
 512         ret = regmap_multi_reg_write(afe->regmap, afe4404_reg_sequences,
 513                                      ARRAY_SIZE(afe4404_reg_sequences));
 514         if (ret) {
 515                 dev_err(afe->dev, "Unable to set register defaults\n");
 516                 goto disable_reg;
 517         }
 518
 519         indio_dev->modes = INDIO_DIRECT_MODE;
 520         indio_dev->dev.parent = afe->dev;
 521         indio_dev->channels = afe4404_channels;
 522         indio_dev->num_channels = ARRAY_SIZE(afe4404_channels);
 523         indio_dev->name = AFE4404_DRIVER_NAME;
 524         indio_dev->info = &afe4404_iio_info;
 525
 526         if (afe->irq > 0) {
 527                 afe->trig = devm_iio_trigger_alloc(afe->dev,
 528                                                    "%s-dev%d",
 529                                                    indio_dev->name,
 530                                                    indio_dev->id);
 531                 if (!afe->trig) {
 532                         dev_err(afe->dev, "Unable to allocate IIO trigger\n");
 533                         ret = -ENOMEM;
 534                         goto disable_reg;
 535                 }
 536
 537                 iio_trigger_set_drvdata(afe->trig, indio_dev);
 538
 539                 afe->trig->ops = &afe4404_trigger_ops;
 540                 afe->trig->dev.parent = afe->dev;
 541
 542                 ret = iio_trigger_register(afe->trig);
 543                 if (ret) {
 544                         dev_err(afe->dev, "Unable to register IIO trigger\n");
 545                         goto disable_reg;
 546                 }
 547
 548                 ret = devm_request_threaded_irq(afe->dev, afe->irq,
 549                                                 iio_trigger_generic_data_rdy_poll,
 550                                                 NULL, IRQF_ONESHOT,
 551                                                 AFE4404_DRIVER_NAME,
 552                                                 afe->trig);
 553                 if (ret) {
 554                         dev_err(afe->dev, "Unable to request IRQ\n");
 555                         goto disable_reg;
 556                 }
 557         }
 558
 559         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 560                                          afe4404_trigger_handler, NULL);
 561         if (ret) {
 562                 dev_err(afe->dev, "Unable to setup buffer\n");
 563                 goto unregister_trigger;
 564         }
 565
 566         ret = iio_device_register(indio_dev);
 567         if (ret) {
 568                 dev_err(afe->dev, "Unable to register IIO device\n");
 569                 goto unregister_triggered_buffer;
 570         }
 571
 572         return 0;
 573
 574 unregister_triggered_buffer:
 575         iio_triggered_buffer_cleanup(indio_dev);
 576 unregister_trigger:
 577         if (afe->irq > 0)
 578                 iio_trigger_unregister(afe->trig);
 579 disable_reg:
 580         regulator_disable(afe->regulator);
 581
 582         return ret;
 583 }
 584
 585 static int afe4404_remove(struct i2c_client *client)
 586 {
 587         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 588         struct afe4404_data *afe = iio_priv(indio_dev);
 589         int ret;
 590
 591         iio_device_unregister(indio_dev);
 592
 593         iio_triggered_buffer_cleanup(indio_dev);
 594
 595         if (afe->irq > 0)
 596                 iio_trigger_unregister(afe->trig);
 597
 598         ret = regulator_disable(afe->regulator);
 599         if (ret) {
 600                 dev_err(afe->dev, "Unable to disable regulator\n");
 601                 return ret;
 602         }
 603
 604         return 0;
 605 }
 606
 607 static const struct i2c_device_id afe4404_ids[] = {
 608         { "afe4404", 0 },
 609         { /* sentinel */ }
 610 };
 611 MODULE_DEVICE_TABLE(i2c, afe4404_ids);
 612
 613 static struct i2c_driver afe4404_i2c_driver = {
 614         .driver = {
 615                 .name = AFE4404_DRIVER_NAME,
 616                 .of_match_table = afe4404_of_match,
 617                 .pm = &afe4404_pm_ops,
 618         },
 619         .probe = afe4404_probe,
 620         .remove = afe4404_remove,
 621         .id_table = afe4404_ids,
 622 };
 623 module_i2c_driver(afe4404_i2c_driver);
 624
 625 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 626 MODULE_DESCRIPTION("TI AFE4404 Heart Rate Monitor and Pulse Oximeter AFE");
 627 MODULE_LICENSE("GPL v2");