xref: /openbmc/linux/drivers/iio/health/afe4403.c (revision 82df5b73)
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");
620