2 * AFE4404 Heart Rate Monitors and Low-Cost Pulse Oximeters
4 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
5 * Andrew F. Davis <afd@ti.com>
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.
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.
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>
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>
36 #define AFE4404_DRIVER_NAME "afe4404"
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
51 /* AFE4404 CONTROL2 register fields */
52 #define AFE440X_CONTROL2_OSC_ENABLE BIT(9)
56 F_TIA_GAIN_SEP, F_TIA_CF_SEP,
60 F_ILED1, F_ILED2, F_ILED3,
63 F_OFFDAC_AMB2, F_OFFDAC_LED1, F_OFFDAC_AMB1, F_OFFDAC_LED2,
69 static const struct reg_field afe4404_reg_fields[] = {
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),
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),
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),
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 * @buffer: Used to construct a scan to push to the iio buffer.
98 struct regmap *regmap;
99 struct regmap_field *fields[F_MAX_FIELDS];
100 struct regulator *regulator;
101 struct iio_trigger *trig;
103 s32 buffer[10] __aligned(8);
106 enum afe4404_chan_id {
115 static const unsigned int afe4404_channel_values[] = {
116 [LED2] = AFE440X_LED2VAL,
117 [ALED2] = AFE440X_ALED2VAL,
118 [LED1] = AFE440X_LED1VAL,
119 [ALED1] = AFE440X_ALED1VAL,
120 [LED2_ALED2] = AFE440X_LED2_ALED2VAL,
121 [LED1_ALED1] = AFE440X_LED1_ALED1VAL,
124 static const unsigned int afe4404_channel_leds[] = {
130 static const unsigned int afe4404_channel_offdacs[] = {
131 [LED2] = F_OFFDAC_LED2,
132 [ALED2] = F_OFFDAC_AMB2,
133 [LED1] = F_OFFDAC_LED1,
134 [ALED1] = F_OFFDAC_AMB1,
137 static const struct iio_chan_spec afe4404_channels[] = {
139 AFE440X_INTENSITY_CHAN(LED2, BIT(IIO_CHAN_INFO_OFFSET)),
140 AFE440X_INTENSITY_CHAN(ALED2, BIT(IIO_CHAN_INFO_OFFSET)),
141 AFE440X_INTENSITY_CHAN(LED1, BIT(IIO_CHAN_INFO_OFFSET)),
142 AFE440X_INTENSITY_CHAN(ALED1, BIT(IIO_CHAN_INFO_OFFSET)),
143 AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
144 AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
146 AFE440X_CURRENT_CHAN(LED2),
147 AFE440X_CURRENT_CHAN(ALED2),
148 AFE440X_CURRENT_CHAN(LED1),
151 static const struct afe440x_val_table afe4404_res_table[] = {
152 { .integer = 500000, .fract = 0 },
153 { .integer = 250000, .fract = 0 },
154 { .integer = 100000, .fract = 0 },
155 { .integer = 50000, .fract = 0 },
156 { .integer = 25000, .fract = 0 },
157 { .integer = 10000, .fract = 0 },
158 { .integer = 1000000, .fract = 0 },
159 { .integer = 2000000, .fract = 0 },
161 AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4404_res_table);
163 static const struct afe440x_val_table afe4404_cap_table[] = {
164 { .integer = 0, .fract = 5000 },
165 { .integer = 0, .fract = 2500 },
166 { .integer = 0, .fract = 10000 },
167 { .integer = 0, .fract = 7500 },
168 { .integer = 0, .fract = 20000 },
169 { .integer = 0, .fract = 17500 },
170 { .integer = 0, .fract = 25000 },
171 { .integer = 0, .fract = 22500 },
173 AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4404_cap_table);
175 static ssize_t afe440x_show_register(struct device *dev,
176 struct device_attribute *attr,
179 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
180 struct afe4404_data *afe = iio_priv(indio_dev);
181 struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
182 unsigned int reg_val;
186 ret = regmap_field_read(afe->fields[afe440x_attr->field], ®_val);
190 if (reg_val >= afe440x_attr->table_size)
193 vals[0] = afe440x_attr->val_table[reg_val].integer;
194 vals[1] = afe440x_attr->val_table[reg_val].fract;
196 return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
199 static ssize_t afe440x_store_register(struct device *dev,
200 struct device_attribute *attr,
201 const char *buf, size_t count)
203 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
204 struct afe4404_data *afe = iio_priv(indio_dev);
205 struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
206 int val, integer, fract, ret;
208 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
212 for (val = 0; val < afe440x_attr->table_size; val++)
213 if (afe440x_attr->val_table[val].integer == integer &&
214 afe440x_attr->val_table[val].fract == fract)
216 if (val == afe440x_attr->table_size)
219 ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
226 static AFE440X_ATTR(in_intensity1_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
227 static AFE440X_ATTR(in_intensity1_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
229 static AFE440X_ATTR(in_intensity2_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
230 static AFE440X_ATTR(in_intensity2_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
232 static AFE440X_ATTR(in_intensity3_resistance, F_TIA_GAIN, afe4404_res_table);
233 static AFE440X_ATTR(in_intensity3_capacitance, TIA_CF, afe4404_cap_table);
235 static AFE440X_ATTR(in_intensity4_resistance, F_TIA_GAIN, afe4404_res_table);
236 static AFE440X_ATTR(in_intensity4_capacitance, TIA_CF, afe4404_cap_table);
238 static struct attribute *afe440x_attributes[] = {
239 &dev_attr_in_intensity_resistance_available.attr,
240 &dev_attr_in_intensity_capacitance_available.attr,
241 &afe440x_attr_in_intensity1_resistance.dev_attr.attr,
242 &afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
243 &afe440x_attr_in_intensity2_resistance.dev_attr.attr,
244 &afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
245 &afe440x_attr_in_intensity3_resistance.dev_attr.attr,
246 &afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
247 &afe440x_attr_in_intensity4_resistance.dev_attr.attr,
248 &afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
252 static const struct attribute_group afe440x_attribute_group = {
253 .attrs = afe440x_attributes
256 static int afe4404_read_raw(struct iio_dev *indio_dev,
257 struct iio_chan_spec const *chan,
258 int *val, int *val2, long mask)
260 struct afe4404_data *afe = iio_priv(indio_dev);
261 unsigned int value_reg, led_field, offdac_field;
264 switch (chan->type) {
267 case IIO_CHAN_INFO_RAW:
268 value_reg = afe4404_channel_values[chan->address];
269 ret = regmap_read(afe->regmap, value_reg, val);
273 case IIO_CHAN_INFO_OFFSET:
274 offdac_field = afe4404_channel_offdacs[chan->address];
275 ret = regmap_field_read(afe->fields[offdac_field], val);
283 case IIO_CHAN_INFO_RAW:
284 led_field = afe4404_channel_leds[chan->address];
285 ret = regmap_field_read(afe->fields[led_field], val);
289 case IIO_CHAN_INFO_SCALE:
292 return IIO_VAL_INT_PLUS_MICRO;
302 static int afe4404_write_raw(struct iio_dev *indio_dev,
303 struct iio_chan_spec const *chan,
304 int val, int val2, long mask)
306 struct afe4404_data *afe = iio_priv(indio_dev);
307 unsigned int led_field, offdac_field;
309 switch (chan->type) {
312 case IIO_CHAN_INFO_OFFSET:
313 offdac_field = afe4404_channel_offdacs[chan->address];
314 return regmap_field_write(afe->fields[offdac_field], val);
319 case IIO_CHAN_INFO_RAW:
320 led_field = afe4404_channel_leds[chan->address];
321 return regmap_field_write(afe->fields[led_field], val);
331 static const struct iio_info afe4404_iio_info = {
332 .attrs = &afe440x_attribute_group,
333 .read_raw = afe4404_read_raw,
334 .write_raw = afe4404_write_raw,
335 .driver_module = THIS_MODULE,
338 static irqreturn_t afe4404_trigger_handler(int irq, void *private)
340 struct iio_poll_func *pf = private;
341 struct iio_dev *indio_dev = pf->indio_dev;
342 struct afe4404_data *afe = iio_priv(indio_dev);
345 for_each_set_bit(bit, indio_dev->active_scan_mask,
346 indio_dev->masklength) {
347 ret = regmap_read(afe->regmap, afe4404_channel_values[bit],
353 iio_push_to_buffers_with_timestamp(indio_dev, afe->buffer,
356 iio_trigger_notify_done(indio_dev->trig);
361 static const struct iio_trigger_ops afe4404_trigger_ops = {
362 .owner = THIS_MODULE,
365 /* Default timings from data-sheet */
366 #define AFE4404_TIMING_PAIRS \
367 { AFE440X_PRPCOUNT, 39999 }, \
368 { AFE440X_LED2LEDSTC, 0 }, \
369 { AFE440X_LED2LEDENDC, 398 }, \
370 { AFE440X_LED2STC, 80 }, \
371 { AFE440X_LED2ENDC, 398 }, \
372 { AFE440X_ADCRSTSTCT0, 5600 }, \
373 { AFE440X_ADCRSTENDCT0, 5606 }, \
374 { AFE440X_LED2CONVST, 5607 }, \
375 { AFE440X_LED2CONVEND, 6066 }, \
376 { AFE4404_LED3LEDSTC, 400 }, \
377 { AFE4404_LED3LEDENDC, 798 }, \
378 { AFE440X_ALED2STC, 480 }, \
379 { AFE440X_ALED2ENDC, 798 }, \
380 { AFE440X_ADCRSTSTCT1, 6068 }, \
381 { AFE440X_ADCRSTENDCT1, 6074 }, \
382 { AFE440X_ALED2CONVST, 6075 }, \
383 { AFE440X_ALED2CONVEND, 6534 }, \
384 { AFE440X_LED1LEDSTC, 800 }, \
385 { AFE440X_LED1LEDENDC, 1198 }, \
386 { AFE440X_LED1STC, 880 }, \
387 { AFE440X_LED1ENDC, 1198 }, \
388 { AFE440X_ADCRSTSTCT2, 6536 }, \
389 { AFE440X_ADCRSTENDCT2, 6542 }, \
390 { AFE440X_LED1CONVST, 6543 }, \
391 { AFE440X_LED1CONVEND, 7003 }, \
392 { AFE440X_ALED1STC, 1280 }, \
393 { AFE440X_ALED1ENDC, 1598 }, \
394 { AFE440X_ADCRSTSTCT3, 7005 }, \
395 { AFE440X_ADCRSTENDCT3, 7011 }, \
396 { AFE440X_ALED1CONVST, 7012 }, \
397 { AFE440X_ALED1CONVEND, 7471 }, \
398 { AFE440X_PDNCYCLESTC, 7671 }, \
399 { AFE440X_PDNCYCLEENDC, 39199 }
401 static const struct reg_sequence afe4404_reg_sequences[] = {
402 AFE4404_TIMING_PAIRS,
403 { AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
404 { AFE4404_TIA_GAIN_SEP, AFE440X_TIAGAIN_ENSEPGAIN },
405 { AFE440X_CONTROL2, AFE440X_CONTROL2_OSC_ENABLE },
408 static const struct regmap_range afe4404_yes_ranges[] = {
409 regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
410 regmap_reg_range(AFE4404_AVG_LED2_ALED2VAL, AFE4404_AVG_LED1_ALED1VAL),
413 static const struct regmap_access_table afe4404_volatile_table = {
414 .yes_ranges = afe4404_yes_ranges,
415 .n_yes_ranges = ARRAY_SIZE(afe4404_yes_ranges),
418 static const struct regmap_config afe4404_regmap_config = {
422 .max_register = AFE4404_AVG_LED1_ALED1VAL,
423 .cache_type = REGCACHE_RBTREE,
424 .volatile_table = &afe4404_volatile_table,
427 static const struct of_device_id afe4404_of_match[] = {
428 { .compatible = "ti,afe4404", },
431 MODULE_DEVICE_TABLE(of, afe4404_of_match);
433 static int __maybe_unused afe4404_suspend(struct device *dev)
435 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
436 struct afe4404_data *afe = iio_priv(indio_dev);
439 ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
440 AFE440X_CONTROL2_PDN_AFE,
441 AFE440X_CONTROL2_PDN_AFE);
445 ret = regulator_disable(afe->regulator);
447 dev_err(dev, "Unable to disable regulator\n");
454 static int __maybe_unused afe4404_resume(struct device *dev)
456 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
457 struct afe4404_data *afe = iio_priv(indio_dev);
460 ret = regulator_enable(afe->regulator);
462 dev_err(dev, "Unable to enable regulator\n");
466 ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
467 AFE440X_CONTROL2_PDN_AFE, 0);
474 static SIMPLE_DEV_PM_OPS(afe4404_pm_ops, afe4404_suspend, afe4404_resume);
476 static int afe4404_probe(struct i2c_client *client,
477 const struct i2c_device_id *id)
479 struct iio_dev *indio_dev;
480 struct afe4404_data *afe;
483 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*afe));
487 afe = iio_priv(indio_dev);
488 i2c_set_clientdata(client, indio_dev);
490 afe->dev = &client->dev;
491 afe->irq = client->irq;
493 afe->regmap = devm_regmap_init_i2c(client, &afe4404_regmap_config);
494 if (IS_ERR(afe->regmap)) {
495 dev_err(afe->dev, "Unable to allocate register map\n");
496 return PTR_ERR(afe->regmap);
499 for (i = 0; i < F_MAX_FIELDS; i++) {
500 afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
501 afe4404_reg_fields[i]);
502 if (IS_ERR(afe->fields[i])) {
503 dev_err(afe->dev, "Unable to allocate regmap fields\n");
504 return PTR_ERR(afe->fields[i]);
508 afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
509 if (IS_ERR(afe->regulator)) {
510 dev_err(afe->dev, "Unable to get regulator\n");
511 return PTR_ERR(afe->regulator);
513 ret = regulator_enable(afe->regulator);
515 dev_err(afe->dev, "Unable to enable regulator\n");
519 ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
520 AFE440X_CONTROL0_SW_RESET);
522 dev_err(afe->dev, "Unable to reset device\n");
526 ret = regmap_multi_reg_write(afe->regmap, afe4404_reg_sequences,
527 ARRAY_SIZE(afe4404_reg_sequences));
529 dev_err(afe->dev, "Unable to set register defaults\n");
533 indio_dev->modes = INDIO_DIRECT_MODE;
534 indio_dev->dev.parent = afe->dev;
535 indio_dev->channels = afe4404_channels;
536 indio_dev->num_channels = ARRAY_SIZE(afe4404_channels);
537 indio_dev->name = AFE4404_DRIVER_NAME;
538 indio_dev->info = &afe4404_iio_info;
541 afe->trig = devm_iio_trigger_alloc(afe->dev,
546 dev_err(afe->dev, "Unable to allocate IIO trigger\n");
551 iio_trigger_set_drvdata(afe->trig, indio_dev);
553 afe->trig->ops = &afe4404_trigger_ops;
554 afe->trig->dev.parent = afe->dev;
556 ret = iio_trigger_register(afe->trig);
558 dev_err(afe->dev, "Unable to register IIO trigger\n");
562 ret = devm_request_threaded_irq(afe->dev, afe->irq,
563 iio_trigger_generic_data_rdy_poll,
568 dev_err(afe->dev, "Unable to request IRQ\n");
573 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
574 afe4404_trigger_handler, NULL);
576 dev_err(afe->dev, "Unable to setup buffer\n");
577 goto unregister_trigger;
580 ret = iio_device_register(indio_dev);
582 dev_err(afe->dev, "Unable to register IIO device\n");
583 goto unregister_triggered_buffer;
588 unregister_triggered_buffer:
589 iio_triggered_buffer_cleanup(indio_dev);
592 iio_trigger_unregister(afe->trig);
594 regulator_disable(afe->regulator);
599 static int afe4404_remove(struct i2c_client *client)
601 struct iio_dev *indio_dev = i2c_get_clientdata(client);
602 struct afe4404_data *afe = iio_priv(indio_dev);
605 iio_device_unregister(indio_dev);
607 iio_triggered_buffer_cleanup(indio_dev);
610 iio_trigger_unregister(afe->trig);
612 ret = regulator_disable(afe->regulator);
614 dev_err(afe->dev, "Unable to disable regulator\n");
621 static const struct i2c_device_id afe4404_ids[] = {
625 MODULE_DEVICE_TABLE(i2c, afe4404_ids);
627 static struct i2c_driver afe4404_i2c_driver = {
629 .name = AFE4404_DRIVER_NAME,
630 .of_match_table = afe4404_of_match,
631 .pm = &afe4404_pm_ops,
633 .probe = afe4404_probe,
634 .remove = afe4404_remove,
635 .id_table = afe4404_ids,
637 module_i2c_driver(afe4404_i2c_driver);
639 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
640 MODULE_DESCRIPTION("TI AFE4404 Heart Rate Monitor and Pulse Oximeter AFE");
641 MODULE_LICENSE("GPL v2");