1 /* 2 * AFE4404 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/i2c.h> 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/regmap.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 AFE4404_DRIVER_NAME "afe4404" 37 38 /* AFE4404 registers */ 39 #define AFE4404_TIA_GAIN_SEP 0x20 40 #define AFE4404_TIA_GAIN 0x21 41 #define AFE4404_PROG_TG_STC 0x34 42 #define AFE4404_PROG_TG_ENDC 0x35 43 #define AFE4404_LED3LEDSTC 0x36 44 #define AFE4404_LED3LEDENDC 0x37 45 #define AFE4404_CLKDIV_PRF 0x39 46 #define AFE4404_OFFDAC 0x3a 47 #define AFE4404_DEC 0x3d 48 #define AFE4404_AVG_LED2_ALED2VAL 0x3f 49 #define AFE4404_AVG_LED1_ALED1VAL 0x40 50 51 /* AFE4404 CONTROL2 register fields */ 52 #define AFE440X_CONTROL2_OSC_ENABLE BIT(9) 53 54 enum afe4404_fields { 55 /* Gains */ 56 F_TIA_GAIN_SEP, F_TIA_CF_SEP, 57 F_TIA_GAIN, TIA_CF, 58 59 /* LED Current */ 60 F_ILED1, F_ILED2, F_ILED3, 61 62 /* Offset DAC */ 63 F_OFFDAC_AMB2, F_OFFDAC_LED1, F_OFFDAC_AMB1, F_OFFDAC_LED2, 64 65 /* sentinel */ 66 F_MAX_FIELDS 67 }; 68 69 static const struct reg_field afe4404_reg_fields[] = { 70 /* Gains */ 71 [F_TIA_GAIN_SEP] = REG_FIELD(AFE4404_TIA_GAIN_SEP, 0, 2), 72 [F_TIA_CF_SEP] = REG_FIELD(AFE4404_TIA_GAIN_SEP, 3, 5), 73 [F_TIA_GAIN] = REG_FIELD(AFE4404_TIA_GAIN, 0, 2), 74 [TIA_CF] = REG_FIELD(AFE4404_TIA_GAIN, 3, 5), 75 /* LED Current */ 76 [F_ILED1] = REG_FIELD(AFE440X_LEDCNTRL, 0, 5), 77 [F_ILED2] = REG_FIELD(AFE440X_LEDCNTRL, 6, 11), 78 [F_ILED3] = REG_FIELD(AFE440X_LEDCNTRL, 12, 17), 79 /* Offset DAC */ 80 [F_OFFDAC_AMB2] = REG_FIELD(AFE4404_OFFDAC, 0, 4), 81 [F_OFFDAC_LED1] = REG_FIELD(AFE4404_OFFDAC, 5, 9), 82 [F_OFFDAC_AMB1] = REG_FIELD(AFE4404_OFFDAC, 10, 14), 83 [F_OFFDAC_LED2] = REG_FIELD(AFE4404_OFFDAC, 15, 19), 84 }; 85 86 /** 87 * struct afe4404_data - AFE4404 device instance data 88 * @dev: Device structure 89 * @regmap: Register map of the device 90 * @fields: Register fields of the device 91 * @regulator: Pointer to the regulator for the IC 92 * @trig: IIO trigger for this device 93 * @irq: ADC_RDY line interrupt number 94 */ 95 struct afe4404_data { 96 struct device *dev; 97 struct regmap *regmap; 98 struct regmap_field *fields[F_MAX_FIELDS]; 99 struct regulator *regulator; 100 struct iio_trigger *trig; 101 int irq; 102 }; 103 104 enum afe4404_chan_id { 105 LED2 = 1, 106 ALED2, 107 LED1, 108 ALED1, 109 LED2_ALED2, 110 LED1_ALED1, 111 }; 112 113 static const unsigned int afe4404_channel_values[] = { 114 [LED2] = AFE440X_LED2VAL, 115 [ALED2] = AFE440X_ALED2VAL, 116 [LED1] = AFE440X_LED1VAL, 117 [ALED1] = AFE440X_ALED1VAL, 118 [LED2_ALED2] = AFE440X_LED2_ALED2VAL, 119 [LED1_ALED1] = AFE440X_LED1_ALED1VAL, 120 }; 121 122 static const unsigned int afe4404_channel_leds[] = { 123 [LED2] = F_ILED2, 124 [ALED2] = F_ILED3, 125 [LED1] = F_ILED1, 126 }; 127 128 static const unsigned int afe4404_channel_offdacs[] = { 129 [LED2] = F_OFFDAC_LED2, 130 [ALED2] = F_OFFDAC_AMB2, 131 [LED1] = F_OFFDAC_LED1, 132 [ALED1] = F_OFFDAC_AMB1, 133 }; 134 135 static const struct iio_chan_spec afe4404_channels[] = { 136 /* ADC values */ 137 AFE440X_INTENSITY_CHAN(LED2, BIT(IIO_CHAN_INFO_OFFSET)), 138 AFE440X_INTENSITY_CHAN(ALED2, BIT(IIO_CHAN_INFO_OFFSET)), 139 AFE440X_INTENSITY_CHAN(LED1, BIT(IIO_CHAN_INFO_OFFSET)), 140 AFE440X_INTENSITY_CHAN(ALED1, BIT(IIO_CHAN_INFO_OFFSET)), 141 AFE440X_INTENSITY_CHAN(LED2_ALED2, 0), 142 AFE440X_INTENSITY_CHAN(LED1_ALED1, 0), 143 /* LED current */ 144 AFE440X_CURRENT_CHAN(LED2), 145 AFE440X_CURRENT_CHAN(ALED2), 146 AFE440X_CURRENT_CHAN(LED1), 147 }; 148 149 static const struct afe440x_val_table afe4404_res_table[] = { 150 { .integer = 500000, .fract = 0 }, 151 { .integer = 250000, .fract = 0 }, 152 { .integer = 100000, .fract = 0 }, 153 { .integer = 50000, .fract = 0 }, 154 { .integer = 25000, .fract = 0 }, 155 { .integer = 10000, .fract = 0 }, 156 { .integer = 1000000, .fract = 0 }, 157 { .integer = 2000000, .fract = 0 }, 158 }; 159 AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4404_res_table); 160 161 static const struct afe440x_val_table afe4404_cap_table[] = { 162 { .integer = 0, .fract = 5000 }, 163 { .integer = 0, .fract = 2500 }, 164 { .integer = 0, .fract = 10000 }, 165 { .integer = 0, .fract = 7500 }, 166 { .integer = 0, .fract = 20000 }, 167 { .integer = 0, .fract = 17500 }, 168 { .integer = 0, .fract = 25000 }, 169 { .integer = 0, .fract = 22500 }, 170 }; 171 AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4404_cap_table); 172 173 static ssize_t afe440x_show_register(struct device *dev, 174 struct device_attribute *attr, 175 char *buf) 176 { 177 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 178 struct afe4404_data *afe = iio_priv(indio_dev); 179 struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr); 180 unsigned int reg_val; 181 int vals[2]; 182 int ret; 183 184 ret = regmap_field_read(afe->fields[afe440x_attr->field], ®_val); 185 if (ret) 186 return ret; 187 188 if (reg_val >= afe440x_attr->table_size) 189 return -EINVAL; 190 191 vals[0] = afe440x_attr->val_table[reg_val].integer; 192 vals[1] = afe440x_attr->val_table[reg_val].fract; 193 194 return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals); 195 } 196 197 static ssize_t afe440x_store_register(struct device *dev, 198 struct device_attribute *attr, 199 const char *buf, size_t count) 200 { 201 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 202 struct afe4404_data *afe = iio_priv(indio_dev); 203 struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr); 204 int val, integer, fract, ret; 205 206 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract); 207 if (ret) 208 return ret; 209 210 for (val = 0; val < afe440x_attr->table_size; val++) 211 if (afe440x_attr->val_table[val].integer == integer && 212 afe440x_attr->val_table[val].fract == fract) 213 break; 214 if (val == afe440x_attr->table_size) 215 return -EINVAL; 216 217 ret = regmap_field_write(afe->fields[afe440x_attr->field], val); 218 if (ret) 219 return ret; 220 221 return count; 222 } 223 224 static AFE440X_ATTR(in_intensity1_resistance, F_TIA_GAIN_SEP, afe4404_res_table); 225 static AFE440X_ATTR(in_intensity1_capacitance, F_TIA_CF_SEP, afe4404_cap_table); 226 227 static AFE440X_ATTR(in_intensity2_resistance, F_TIA_GAIN_SEP, afe4404_res_table); 228 static AFE440X_ATTR(in_intensity2_capacitance, F_TIA_CF_SEP, afe4404_cap_table); 229 230 static AFE440X_ATTR(in_intensity3_resistance, F_TIA_GAIN, afe4404_res_table); 231 static AFE440X_ATTR(in_intensity3_capacitance, TIA_CF, afe4404_cap_table); 232 233 static AFE440X_ATTR(in_intensity4_resistance, F_TIA_GAIN, afe4404_res_table); 234 static AFE440X_ATTR(in_intensity4_capacitance, TIA_CF, afe4404_cap_table); 235 236 static struct attribute *afe440x_attributes[] = { 237 &dev_attr_in_intensity_resistance_available.attr, 238 &dev_attr_in_intensity_capacitance_available.attr, 239 &afe440x_attr_in_intensity1_resistance.dev_attr.attr, 240 &afe440x_attr_in_intensity1_capacitance.dev_attr.attr, 241 &afe440x_attr_in_intensity2_resistance.dev_attr.attr, 242 &afe440x_attr_in_intensity2_capacitance.dev_attr.attr, 243 &afe440x_attr_in_intensity3_resistance.dev_attr.attr, 244 &afe440x_attr_in_intensity3_capacitance.dev_attr.attr, 245 &afe440x_attr_in_intensity4_resistance.dev_attr.attr, 246 &afe440x_attr_in_intensity4_capacitance.dev_attr.attr, 247 NULL 248 }; 249 250 static const struct attribute_group afe440x_attribute_group = { 251 .attrs = afe440x_attributes 252 }; 253 254 static int afe4404_read_raw(struct iio_dev *indio_dev, 255 struct iio_chan_spec const *chan, 256 int *val, int *val2, long mask) 257 { 258 struct afe4404_data *afe = iio_priv(indio_dev); 259 unsigned int value_reg = afe4404_channel_values[chan->address]; 260 unsigned int led_field = afe4404_channel_leds[chan->address]; 261 unsigned int offdac_field = afe4404_channel_offdacs[chan->address]; 262 int ret; 263 264 switch (chan->type) { 265 case IIO_INTENSITY: 266 switch (mask) { 267 case IIO_CHAN_INFO_RAW: 268 ret = regmap_read(afe->regmap, value_reg, val); 269 if (ret) 270 return ret; 271 return IIO_VAL_INT; 272 case IIO_CHAN_INFO_OFFSET: 273 ret = regmap_field_read(afe->fields[offdac_field], val); 274 if (ret) 275 return ret; 276 return IIO_VAL_INT; 277 } 278 break; 279 case IIO_CURRENT: 280 switch (mask) { 281 case IIO_CHAN_INFO_RAW: 282 ret = regmap_field_read(afe->fields[led_field], val); 283 if (ret) 284 return ret; 285 return IIO_VAL_INT; 286 case IIO_CHAN_INFO_SCALE: 287 *val = 0; 288 *val2 = 800000; 289 return IIO_VAL_INT_PLUS_MICRO; 290 } 291 break; 292 default: 293 break; 294 } 295 296 return -EINVAL; 297 } 298 299 static int afe4404_write_raw(struct iio_dev *indio_dev, 300 struct iio_chan_spec const *chan, 301 int val, int val2, long mask) 302 { 303 struct afe4404_data *afe = iio_priv(indio_dev); 304 unsigned int led_field = afe4404_channel_leds[chan->address]; 305 unsigned int offdac_field = afe4404_channel_offdacs[chan->address]; 306 307 switch (chan->type) { 308 case IIO_INTENSITY: 309 switch (mask) { 310 case IIO_CHAN_INFO_OFFSET: 311 return regmap_field_write(afe->fields[offdac_field], val); 312 } 313 break; 314 case IIO_CURRENT: 315 switch (mask) { 316 case IIO_CHAN_INFO_RAW: 317 return regmap_field_write(afe->fields[led_field], val); 318 } 319 break; 320 default: 321 break; 322 } 323 324 return -EINVAL; 325 } 326 327 static const struct iio_info afe4404_iio_info = { 328 .attrs = &afe440x_attribute_group, 329 .read_raw = afe4404_read_raw, 330 .write_raw = afe4404_write_raw, 331 }; 332 333 static irqreturn_t afe4404_trigger_handler(int irq, void *private) 334 { 335 struct iio_poll_func *pf = private; 336 struct iio_dev *indio_dev = pf->indio_dev; 337 struct afe4404_data *afe = iio_priv(indio_dev); 338 int ret, bit, i = 0; 339 s32 buffer[10]; 340 341 for_each_set_bit(bit, indio_dev->active_scan_mask, 342 indio_dev->masklength) { 343 ret = regmap_read(afe->regmap, afe4404_channel_values[bit], 344 &buffer[i++]); 345 if (ret) 346 goto err; 347 } 348 349 iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp); 350 err: 351 iio_trigger_notify_done(indio_dev->trig); 352 353 return IRQ_HANDLED; 354 } 355 356 static const struct iio_trigger_ops afe4404_trigger_ops = { 357 }; 358 359 /* Default timings from data-sheet */ 360 #define AFE4404_TIMING_PAIRS \ 361 { AFE440X_PRPCOUNT, 39999 }, \ 362 { AFE440X_LED2LEDSTC, 0 }, \ 363 { AFE440X_LED2LEDENDC, 398 }, \ 364 { AFE440X_LED2STC, 80 }, \ 365 { AFE440X_LED2ENDC, 398 }, \ 366 { AFE440X_ADCRSTSTCT0, 5600 }, \ 367 { AFE440X_ADCRSTENDCT0, 5606 }, \ 368 { AFE440X_LED2CONVST, 5607 }, \ 369 { AFE440X_LED2CONVEND, 6066 }, \ 370 { AFE4404_LED3LEDSTC, 400 }, \ 371 { AFE4404_LED3LEDENDC, 798 }, \ 372 { AFE440X_ALED2STC, 480 }, \ 373 { AFE440X_ALED2ENDC, 798 }, \ 374 { AFE440X_ADCRSTSTCT1, 6068 }, \ 375 { AFE440X_ADCRSTENDCT1, 6074 }, \ 376 { AFE440X_ALED2CONVST, 6075 }, \ 377 { AFE440X_ALED2CONVEND, 6534 }, \ 378 { AFE440X_LED1LEDSTC, 800 }, \ 379 { AFE440X_LED1LEDENDC, 1198 }, \ 380 { AFE440X_LED1STC, 880 }, \ 381 { AFE440X_LED1ENDC, 1198 }, \ 382 { AFE440X_ADCRSTSTCT2, 6536 }, \ 383 { AFE440X_ADCRSTENDCT2, 6542 }, \ 384 { AFE440X_LED1CONVST, 6543 }, \ 385 { AFE440X_LED1CONVEND, 7003 }, \ 386 { AFE440X_ALED1STC, 1280 }, \ 387 { AFE440X_ALED1ENDC, 1598 }, \ 388 { AFE440X_ADCRSTSTCT3, 7005 }, \ 389 { AFE440X_ADCRSTENDCT3, 7011 }, \ 390 { AFE440X_ALED1CONVST, 7012 }, \ 391 { AFE440X_ALED1CONVEND, 7471 }, \ 392 { AFE440X_PDNCYCLESTC, 7671 }, \ 393 { AFE440X_PDNCYCLEENDC, 39199 } 394 395 static const struct reg_sequence afe4404_reg_sequences[] = { 396 AFE4404_TIMING_PAIRS, 397 { AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN }, 398 { AFE4404_TIA_GAIN_SEP, AFE440X_TIAGAIN_ENSEPGAIN }, 399 { AFE440X_CONTROL2, AFE440X_CONTROL2_OSC_ENABLE }, 400 }; 401 402 static const struct regmap_range afe4404_yes_ranges[] = { 403 regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL), 404 regmap_reg_range(AFE4404_AVG_LED2_ALED2VAL, AFE4404_AVG_LED1_ALED1VAL), 405 }; 406 407 static const struct regmap_access_table afe4404_volatile_table = { 408 .yes_ranges = afe4404_yes_ranges, 409 .n_yes_ranges = ARRAY_SIZE(afe4404_yes_ranges), 410 }; 411 412 static const struct regmap_config afe4404_regmap_config = { 413 .reg_bits = 8, 414 .val_bits = 24, 415 416 .max_register = AFE4404_AVG_LED1_ALED1VAL, 417 .cache_type = REGCACHE_RBTREE, 418 .volatile_table = &afe4404_volatile_table, 419 }; 420 421 static const struct of_device_id afe4404_of_match[] = { 422 { .compatible = "ti,afe4404", }, 423 { /* sentinel */ } 424 }; 425 MODULE_DEVICE_TABLE(of, afe4404_of_match); 426 427 static int __maybe_unused afe4404_suspend(struct device *dev) 428 { 429 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 430 struct afe4404_data *afe = iio_priv(indio_dev); 431 int ret; 432 433 ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2, 434 AFE440X_CONTROL2_PDN_AFE, 435 AFE440X_CONTROL2_PDN_AFE); 436 if (ret) 437 return ret; 438 439 ret = regulator_disable(afe->regulator); 440 if (ret) { 441 dev_err(dev, "Unable to disable regulator\n"); 442 return ret; 443 } 444 445 return 0; 446 } 447 448 static int __maybe_unused afe4404_resume(struct device *dev) 449 { 450 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 451 struct afe4404_data *afe = iio_priv(indio_dev); 452 int ret; 453 454 ret = regulator_enable(afe->regulator); 455 if (ret) { 456 dev_err(dev, "Unable to enable regulator\n"); 457 return ret; 458 } 459 460 ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2, 461 AFE440X_CONTROL2_PDN_AFE, 0); 462 if (ret) 463 return ret; 464 465 return 0; 466 } 467 468 static SIMPLE_DEV_PM_OPS(afe4404_pm_ops, afe4404_suspend, afe4404_resume); 469 470 static int afe4404_probe(struct i2c_client *client, 471 const struct i2c_device_id *id) 472 { 473 struct iio_dev *indio_dev; 474 struct afe4404_data *afe; 475 int i, ret; 476 477 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*afe)); 478 if (!indio_dev) 479 return -ENOMEM; 480 481 afe = iio_priv(indio_dev); 482 i2c_set_clientdata(client, indio_dev); 483 484 afe->dev = &client->dev; 485 afe->irq = client->irq; 486 487 afe->regmap = devm_regmap_init_i2c(client, &afe4404_regmap_config); 488 if (IS_ERR(afe->regmap)) { 489 dev_err(afe->dev, "Unable to allocate register map\n"); 490 return PTR_ERR(afe->regmap); 491 } 492 493 for (i = 0; i < F_MAX_FIELDS; i++) { 494 afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap, 495 afe4404_reg_fields[i]); 496 if (IS_ERR(afe->fields[i])) { 497 dev_err(afe->dev, "Unable to allocate regmap fields\n"); 498 return PTR_ERR(afe->fields[i]); 499 } 500 } 501 502 afe->regulator = devm_regulator_get(afe->dev, "tx_sup"); 503 if (IS_ERR(afe->regulator)) { 504 dev_err(afe->dev, "Unable to get regulator\n"); 505 return PTR_ERR(afe->regulator); 506 } 507 ret = regulator_enable(afe->regulator); 508 if (ret) { 509 dev_err(afe->dev, "Unable to enable regulator\n"); 510 return ret; 511 } 512 513 ret = regmap_write(afe->regmap, AFE440X_CONTROL0, 514 AFE440X_CONTROL0_SW_RESET); 515 if (ret) { 516 dev_err(afe->dev, "Unable to reset device\n"); 517 goto disable_reg; 518 } 519 520 ret = regmap_multi_reg_write(afe->regmap, afe4404_reg_sequences, 521 ARRAY_SIZE(afe4404_reg_sequences)); 522 if (ret) { 523 dev_err(afe->dev, "Unable to set register defaults\n"); 524 goto disable_reg; 525 } 526 527 indio_dev->modes = INDIO_DIRECT_MODE; 528 indio_dev->dev.parent = afe->dev; 529 indio_dev->channels = afe4404_channels; 530 indio_dev->num_channels = ARRAY_SIZE(afe4404_channels); 531 indio_dev->name = AFE4404_DRIVER_NAME; 532 indio_dev->info = &afe4404_iio_info; 533 534 if (afe->irq > 0) { 535 afe->trig = devm_iio_trigger_alloc(afe->dev, 536 "%s-dev%d", 537 indio_dev->name, 538 indio_dev->id); 539 if (!afe->trig) { 540 dev_err(afe->dev, "Unable to allocate IIO trigger\n"); 541 ret = -ENOMEM; 542 goto disable_reg; 543 } 544 545 iio_trigger_set_drvdata(afe->trig, indio_dev); 546 547 afe->trig->ops = &afe4404_trigger_ops; 548 afe->trig->dev.parent = afe->dev; 549 550 ret = iio_trigger_register(afe->trig); 551 if (ret) { 552 dev_err(afe->dev, "Unable to register IIO trigger\n"); 553 goto disable_reg; 554 } 555 556 ret = devm_request_threaded_irq(afe->dev, afe->irq, 557 iio_trigger_generic_data_rdy_poll, 558 NULL, IRQF_ONESHOT, 559 AFE4404_DRIVER_NAME, 560 afe->trig); 561 if (ret) { 562 dev_err(afe->dev, "Unable to request IRQ\n"); 563 goto disable_reg; 564 } 565 } 566 567 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 568 afe4404_trigger_handler, NULL); 569 if (ret) { 570 dev_err(afe->dev, "Unable to setup buffer\n"); 571 goto unregister_trigger; 572 } 573 574 ret = iio_device_register(indio_dev); 575 if (ret) { 576 dev_err(afe->dev, "Unable to register IIO device\n"); 577 goto unregister_triggered_buffer; 578 } 579 580 return 0; 581 582 unregister_triggered_buffer: 583 iio_triggered_buffer_cleanup(indio_dev); 584 unregister_trigger: 585 if (afe->irq > 0) 586 iio_trigger_unregister(afe->trig); 587 disable_reg: 588 regulator_disable(afe->regulator); 589 590 return ret; 591 } 592 593 static int afe4404_remove(struct i2c_client *client) 594 { 595 struct iio_dev *indio_dev = i2c_get_clientdata(client); 596 struct afe4404_data *afe = iio_priv(indio_dev); 597 int ret; 598 599 iio_device_unregister(indio_dev); 600 601 iio_triggered_buffer_cleanup(indio_dev); 602 603 if (afe->irq > 0) 604 iio_trigger_unregister(afe->trig); 605 606 ret = regulator_disable(afe->regulator); 607 if (ret) { 608 dev_err(afe->dev, "Unable to disable regulator\n"); 609 return ret; 610 } 611 612 return 0; 613 } 614 615 static const struct i2c_device_id afe4404_ids[] = { 616 { "afe4404", 0 }, 617 { /* sentinel */ } 618 }; 619 MODULE_DEVICE_TABLE(i2c, afe4404_ids); 620 621 static struct i2c_driver afe4404_i2c_driver = { 622 .driver = { 623 .name = AFE4404_DRIVER_NAME, 624 .of_match_table = afe4404_of_match, 625 .pm = &afe4404_pm_ops, 626 }, 627 .probe = afe4404_probe, 628 .remove = afe4404_remove, 629 .id_table = afe4404_ids, 630 }; 631 module_i2c_driver(afe4404_i2c_driver); 632 633 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); 634 MODULE_DESCRIPTION("TI AFE4404 Heart Rate Monitor and Pulse Oximeter AFE"); 635 MODULE_LICENSE("GPL v2"); 636