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
afe440x_show_register(struct device * dev,struct device_attribute * attr,char * buf)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
afe440x_store_register(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
afe4404_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)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
afe4404_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)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
afe4404_trigger_handler(int irq,void * private)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
afe4404_suspend(struct device * dev)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
afe4404_resume(struct device * dev)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
afe4404_probe(struct i2c_client * client)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
afe4404_remove(struct i2c_client * client)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 = 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