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