2 * AFE4403 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/kernel.h>
21 #include <linux/module.h>
22 #include <linux/regmap.h>
23 #include <linux/spi/spi.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 AFE4403_DRIVER_NAME "afe4403"
38 /* AFE4403 Registers */
39 #define AFE4403_TIAGAIN 0x20
40 #define AFE4403_TIA_AMB_GAIN 0x21
54 static const struct reg_field afe4403_reg_fields[] = {
56 [F_RF_LED1] = REG_FIELD(AFE4403_TIAGAIN, 0, 2),
57 [F_CF_LED1] = REG_FIELD(AFE4403_TIAGAIN, 3, 7),
58 [F_RF_LED] = REG_FIELD(AFE4403_TIA_AMB_GAIN, 0, 2),
59 [F_CF_LED] = REG_FIELD(AFE4403_TIA_AMB_GAIN, 3, 7),
61 [F_ILED1] = REG_FIELD(AFE440X_LEDCNTRL, 0, 7),
62 [F_ILED2] = REG_FIELD(AFE440X_LEDCNTRL, 8, 15),
66 * struct afe4403_data - AFE4403 device instance data
67 * @dev: Device structure
68 * @spi: SPI device handle
69 * @regmap: Register map of the device
70 * @fields: Register fields of the device
71 * @regulator: Pointer to the regulator for the IC
72 * @trig: IIO trigger for this device
73 * @irq: ADC_RDY line interrupt number
74 * @buffer: Used to construct data layout to push into IIO buffer.
78 struct spi_device *spi;
79 struct regmap *regmap;
80 struct regmap_field *fields[F_MAX_FIELDS];
81 struct regulator *regulator;
82 struct iio_trigger *trig;
84 /* Ensure suitable alignment for timestamp */
85 s32 buffer[8] __aligned(8);
88 enum afe4403_chan_id {
97 static const unsigned int afe4403_channel_values[] = {
98 [LED2] = AFE440X_LED2VAL,
99 [ALED2] = AFE440X_ALED2VAL,
100 [LED1] = AFE440X_LED1VAL,
101 [ALED1] = AFE440X_ALED1VAL,
102 [LED2_ALED2] = AFE440X_LED2_ALED2VAL,
103 [LED1_ALED1] = AFE440X_LED1_ALED1VAL,
106 static const unsigned int afe4403_channel_leds[] = {
111 static const struct iio_chan_spec afe4403_channels[] = {
113 AFE440X_INTENSITY_CHAN(LED2, 0),
114 AFE440X_INTENSITY_CHAN(ALED2, 0),
115 AFE440X_INTENSITY_CHAN(LED1, 0),
116 AFE440X_INTENSITY_CHAN(ALED1, 0),
117 AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
118 AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
120 AFE440X_CURRENT_CHAN(LED2),
121 AFE440X_CURRENT_CHAN(LED1),
124 static const struct afe440x_val_table afe4403_res_table[] = {
125 { 500000 }, { 250000 }, { 100000 }, { 50000 },
126 { 25000 }, { 10000 }, { 1000000 }, { 0 },
128 AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4403_res_table);
130 static const struct afe440x_val_table afe4403_cap_table[] = {
131 { 0, 5000 }, { 0, 10000 }, { 0, 20000 }, { 0, 25000 },
132 { 0, 30000 }, { 0, 35000 }, { 0, 45000 }, { 0, 50000 },
133 { 0, 55000 }, { 0, 60000 }, { 0, 70000 }, { 0, 75000 },
134 { 0, 80000 }, { 0, 85000 }, { 0, 95000 }, { 0, 100000 },
135 { 0, 155000 }, { 0, 160000 }, { 0, 170000 }, { 0, 175000 },
136 { 0, 180000 }, { 0, 185000 }, { 0, 195000 }, { 0, 200000 },
137 { 0, 205000 }, { 0, 210000 }, { 0, 220000 }, { 0, 225000 },
138 { 0, 230000 }, { 0, 235000 }, { 0, 245000 }, { 0, 250000 },
140 AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4403_cap_table);
142 static ssize_t afe440x_show_register(struct device *dev,
143 struct device_attribute *attr,
146 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
147 struct afe4403_data *afe = iio_priv(indio_dev);
148 struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
149 unsigned int reg_val;
153 ret = regmap_field_read(afe->fields[afe440x_attr->field], ®_val);
157 if (reg_val >= afe440x_attr->table_size)
160 vals[0] = afe440x_attr->val_table[reg_val].integer;
161 vals[1] = afe440x_attr->val_table[reg_val].fract;
163 return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
166 static ssize_t afe440x_store_register(struct device *dev,
167 struct device_attribute *attr,
168 const char *buf, size_t count)
170 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
171 struct afe4403_data *afe = iio_priv(indio_dev);
172 struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
173 int val, integer, fract, ret;
175 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
179 for (val = 0; val < afe440x_attr->table_size; val++)
180 if (afe440x_attr->val_table[val].integer == integer &&
181 afe440x_attr->val_table[val].fract == fract)
183 if (val == afe440x_attr->table_size)
186 ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
193 static AFE440X_ATTR(in_intensity1_resistance, F_RF_LED, afe4403_res_table);
194 static AFE440X_ATTR(in_intensity1_capacitance, F_CF_LED, afe4403_cap_table);
196 static AFE440X_ATTR(in_intensity2_resistance, F_RF_LED, afe4403_res_table);
197 static AFE440X_ATTR(in_intensity2_capacitance, F_CF_LED, afe4403_cap_table);
199 static AFE440X_ATTR(in_intensity3_resistance, F_RF_LED1, afe4403_res_table);
200 static AFE440X_ATTR(in_intensity3_capacitance, F_CF_LED1, afe4403_cap_table);
202 static AFE440X_ATTR(in_intensity4_resistance, F_RF_LED1, afe4403_res_table);
203 static AFE440X_ATTR(in_intensity4_capacitance, F_CF_LED1, afe4403_cap_table);
205 static struct attribute *afe440x_attributes[] = {
206 &dev_attr_in_intensity_resistance_available.attr,
207 &dev_attr_in_intensity_capacitance_available.attr,
208 &afe440x_attr_in_intensity1_resistance.dev_attr.attr,
209 &afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
210 &afe440x_attr_in_intensity2_resistance.dev_attr.attr,
211 &afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
212 &afe440x_attr_in_intensity3_resistance.dev_attr.attr,
213 &afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
214 &afe440x_attr_in_intensity4_resistance.dev_attr.attr,
215 &afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
219 static const struct attribute_group afe440x_attribute_group = {
220 .attrs = afe440x_attributes
223 static int afe4403_read(struct afe4403_data *afe, unsigned int reg, u32 *val)
225 u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
229 /* Enable reading from the device */
230 ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
234 ret = spi_write_then_read(afe->spi, ®, 1, rx, 3);
238 *val = (rx[0] << 16) |
242 /* Disable reading from the device */
243 tx[3] = AFE440X_CONTROL0_WRITE;
244 ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
251 static int afe4403_read_raw(struct iio_dev *indio_dev,
252 struct iio_chan_spec const *chan,
253 int *val, int *val2, long mask)
255 struct afe4403_data *afe = iio_priv(indio_dev);
256 unsigned int reg, field;
259 switch (chan->type) {
262 case IIO_CHAN_INFO_RAW:
263 reg = afe4403_channel_values[chan->address];
264 ret = afe4403_read(afe, reg, val);
272 case IIO_CHAN_INFO_RAW:
273 field = afe4403_channel_leds[chan->address];
274 ret = regmap_field_read(afe->fields[field], val);
278 case IIO_CHAN_INFO_SCALE:
281 return IIO_VAL_INT_PLUS_MICRO;
291 static int afe4403_write_raw(struct iio_dev *indio_dev,
292 struct iio_chan_spec const *chan,
293 int val, int val2, long mask)
295 struct afe4403_data *afe = iio_priv(indio_dev);
296 unsigned int field = afe4403_channel_leds[chan->address];
298 switch (chan->type) {
301 case IIO_CHAN_INFO_RAW:
302 return regmap_field_write(afe->fields[field], val);
312 static const struct iio_info afe4403_iio_info = {
313 .attrs = &afe440x_attribute_group,
314 .read_raw = afe4403_read_raw,
315 .write_raw = afe4403_write_raw,
318 static irqreturn_t afe4403_trigger_handler(int irq, void *private)
320 struct iio_poll_func *pf = private;
321 struct iio_dev *indio_dev = pf->indio_dev;
322 struct afe4403_data *afe = iio_priv(indio_dev);
324 u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
327 /* Enable reading from the device */
328 ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
332 for_each_set_bit(bit, indio_dev->active_scan_mask,
333 indio_dev->masklength) {
334 ret = spi_write_then_read(afe->spi,
335 &afe4403_channel_values[bit], 1,
340 afe->buffer[i++] = (rx[0] << 16) |
345 /* Disable reading from the device */
346 tx[3] = AFE440X_CONTROL0_WRITE;
347 ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
351 iio_push_to_buffers_with_timestamp(indio_dev, afe->buffer,
354 iio_trigger_notify_done(indio_dev->trig);
359 static const struct iio_trigger_ops afe4403_trigger_ops = {
362 #define AFE4403_TIMING_PAIRS \
363 { AFE440X_LED2STC, 0x000050 }, \
364 { AFE440X_LED2ENDC, 0x0003e7 }, \
365 { AFE440X_LED1LEDSTC, 0x0007d0 }, \
366 { AFE440X_LED1LEDENDC, 0x000bb7 }, \
367 { AFE440X_ALED2STC, 0x000438 }, \
368 { AFE440X_ALED2ENDC, 0x0007cf }, \
369 { AFE440X_LED1STC, 0x000820 }, \
370 { AFE440X_LED1ENDC, 0x000bb7 }, \
371 { AFE440X_LED2LEDSTC, 0x000000 }, \
372 { AFE440X_LED2LEDENDC, 0x0003e7 }, \
373 { AFE440X_ALED1STC, 0x000c08 }, \
374 { AFE440X_ALED1ENDC, 0x000f9f }, \
375 { AFE440X_LED2CONVST, 0x0003ef }, \
376 { AFE440X_LED2CONVEND, 0x0007cf }, \
377 { AFE440X_ALED2CONVST, 0x0007d7 }, \
378 { AFE440X_ALED2CONVEND, 0x000bb7 }, \
379 { AFE440X_LED1CONVST, 0x000bbf }, \
380 { AFE440X_LED1CONVEND, 0x009c3f }, \
381 { AFE440X_ALED1CONVST, 0x000fa7 }, \
382 { AFE440X_ALED1CONVEND, 0x001387 }, \
383 { AFE440X_ADCRSTSTCT0, 0x0003e8 }, \
384 { AFE440X_ADCRSTENDCT0, 0x0003eb }, \
385 { AFE440X_ADCRSTSTCT1, 0x0007d0 }, \
386 { AFE440X_ADCRSTENDCT1, 0x0007d3 }, \
387 { AFE440X_ADCRSTSTCT2, 0x000bb8 }, \
388 { AFE440X_ADCRSTENDCT2, 0x000bbb }, \
389 { AFE440X_ADCRSTSTCT3, 0x000fa0 }, \
390 { AFE440X_ADCRSTENDCT3, 0x000fa3 }, \
391 { AFE440X_PRPCOUNT, 0x009c3f }, \
392 { AFE440X_PDNCYCLESTC, 0x001518 }, \
393 { AFE440X_PDNCYCLEENDC, 0x00991f }
395 static const struct reg_sequence afe4403_reg_sequences[] = {
396 AFE4403_TIMING_PAIRS,
397 { AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
398 { AFE4403_TIAGAIN, AFE440X_TIAGAIN_ENSEPGAIN },
401 static const struct regmap_range afe4403_yes_ranges[] = {
402 regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
405 static const struct regmap_access_table afe4403_volatile_table = {
406 .yes_ranges = afe4403_yes_ranges,
407 .n_yes_ranges = ARRAY_SIZE(afe4403_yes_ranges),
410 static const struct regmap_config afe4403_regmap_config = {
414 .max_register = AFE440X_PDNCYCLEENDC,
415 .cache_type = REGCACHE_RBTREE,
416 .volatile_table = &afe4403_volatile_table,
419 static const struct of_device_id afe4403_of_match[] = {
420 { .compatible = "ti,afe4403", },
423 MODULE_DEVICE_TABLE(of, afe4403_of_match);
425 static int __maybe_unused afe4403_suspend(struct device *dev)
427 struct iio_dev *indio_dev = spi_get_drvdata(to_spi_device(dev));
428 struct afe4403_data *afe = iio_priv(indio_dev);
431 ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
432 AFE440X_CONTROL2_PDN_AFE,
433 AFE440X_CONTROL2_PDN_AFE);
437 ret = regulator_disable(afe->regulator);
439 dev_err(dev, "Unable to disable regulator\n");
446 static int __maybe_unused afe4403_resume(struct device *dev)
448 struct iio_dev *indio_dev = spi_get_drvdata(to_spi_device(dev));
449 struct afe4403_data *afe = iio_priv(indio_dev);
452 ret = regulator_enable(afe->regulator);
454 dev_err(dev, "Unable to enable regulator\n");
458 ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
459 AFE440X_CONTROL2_PDN_AFE, 0);
466 static SIMPLE_DEV_PM_OPS(afe4403_pm_ops, afe4403_suspend, afe4403_resume);
468 static int afe4403_probe(struct spi_device *spi)
470 struct iio_dev *indio_dev;
471 struct afe4403_data *afe;
474 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*afe));
478 afe = iio_priv(indio_dev);
479 spi_set_drvdata(spi, indio_dev);
481 afe->dev = &spi->dev;
485 afe->regmap = devm_regmap_init_spi(spi, &afe4403_regmap_config);
486 if (IS_ERR(afe->regmap)) {
487 dev_err(afe->dev, "Unable to allocate register map\n");
488 return PTR_ERR(afe->regmap);
491 for (i = 0; i < F_MAX_FIELDS; i++) {
492 afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
493 afe4403_reg_fields[i]);
494 if (IS_ERR(afe->fields[i])) {
495 dev_err(afe->dev, "Unable to allocate regmap fields\n");
496 return PTR_ERR(afe->fields[i]);
500 afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
501 if (IS_ERR(afe->regulator)) {
502 dev_err(afe->dev, "Unable to get regulator\n");
503 return PTR_ERR(afe->regulator);
505 ret = regulator_enable(afe->regulator);
507 dev_err(afe->dev, "Unable to enable regulator\n");
511 ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
512 AFE440X_CONTROL0_SW_RESET);
514 dev_err(afe->dev, "Unable to reset device\n");
515 goto err_disable_reg;
518 ret = regmap_multi_reg_write(afe->regmap, afe4403_reg_sequences,
519 ARRAY_SIZE(afe4403_reg_sequences));
521 dev_err(afe->dev, "Unable to set register defaults\n");
522 goto err_disable_reg;
525 indio_dev->modes = INDIO_DIRECT_MODE;
526 indio_dev->dev.parent = afe->dev;
527 indio_dev->channels = afe4403_channels;
528 indio_dev->num_channels = ARRAY_SIZE(afe4403_channels);
529 indio_dev->name = AFE4403_DRIVER_NAME;
530 indio_dev->info = &afe4403_iio_info;
533 afe->trig = devm_iio_trigger_alloc(afe->dev,
538 dev_err(afe->dev, "Unable to allocate IIO trigger\n");
540 goto err_disable_reg;
543 iio_trigger_set_drvdata(afe->trig, indio_dev);
545 afe->trig->ops = &afe4403_trigger_ops;
546 afe->trig->dev.parent = afe->dev;
548 ret = iio_trigger_register(afe->trig);
550 dev_err(afe->dev, "Unable to register IIO trigger\n");
551 goto err_disable_reg;
554 ret = devm_request_threaded_irq(afe->dev, afe->irq,
555 iio_trigger_generic_data_rdy_poll,
560 dev_err(afe->dev, "Unable to request IRQ\n");
565 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
566 afe4403_trigger_handler, NULL);
568 dev_err(afe->dev, "Unable to setup buffer\n");
572 ret = iio_device_register(indio_dev);
574 dev_err(afe->dev, "Unable to register IIO device\n");
581 iio_triggered_buffer_cleanup(indio_dev);
584 iio_trigger_unregister(afe->trig);
586 regulator_disable(afe->regulator);
591 static int afe4403_remove(struct spi_device *spi)
593 struct iio_dev *indio_dev = spi_get_drvdata(spi);
594 struct afe4403_data *afe = iio_priv(indio_dev);
597 iio_device_unregister(indio_dev);
599 iio_triggered_buffer_cleanup(indio_dev);
602 iio_trigger_unregister(afe->trig);
604 ret = regulator_disable(afe->regulator);
606 dev_err(afe->dev, "Unable to disable regulator\n");
613 static const struct spi_device_id afe4403_ids[] = {
617 MODULE_DEVICE_TABLE(spi, afe4403_ids);
619 static struct spi_driver afe4403_spi_driver = {
621 .name = AFE4403_DRIVER_NAME,
622 .of_match_table = afe4403_of_match,
623 .pm = &afe4403_pm_ops,
625 .probe = afe4403_probe,
626 .remove = afe4403_remove,
627 .id_table = afe4403_ids,
629 module_spi_driver(afe4403_spi_driver);
631 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
632 MODULE_DESCRIPTION("TI AFE4403 Heart Rate Monitor and Pulse Oximeter AFE");
633 MODULE_LICENSE("GPL v2");