621 lines
17 KiB
C
621 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AFE4404 Heart Rate Monitors and Low-Cost Pulse Oximeters
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*
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* Copyright (C) 2015-2016 Texas Instruments Incorporated - https://www.ti.com/
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* Andrew F. Davis <afd@ti.com>
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/sysfs.h>
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#include <linux/regulator/consumer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include "afe440x.h"
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#define AFE4404_DRIVER_NAME "afe4404"
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/* AFE4404 registers */
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#define AFE4404_TIA_GAIN_SEP 0x20
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#define AFE4404_TIA_GAIN 0x21
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#define AFE4404_PROG_TG_STC 0x34
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#define AFE4404_PROG_TG_ENDC 0x35
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#define AFE4404_LED3LEDSTC 0x36
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#define AFE4404_LED3LEDENDC 0x37
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#define AFE4404_CLKDIV_PRF 0x39
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#define AFE4404_OFFDAC 0x3a
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#define AFE4404_DEC 0x3d
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#define AFE4404_AVG_LED2_ALED2VAL 0x3f
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#define AFE4404_AVG_LED1_ALED1VAL 0x40
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/* AFE4404 CONTROL2 register fields */
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#define AFE440X_CONTROL2_OSC_ENABLE BIT(9)
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enum afe4404_fields {
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/* Gains */
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F_TIA_GAIN_SEP, F_TIA_CF_SEP,
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F_TIA_GAIN, TIA_CF,
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/* LED Current */
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F_ILED1, F_ILED2, F_ILED3,
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/* Offset DAC */
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F_OFFDAC_AMB2, F_OFFDAC_LED1, F_OFFDAC_AMB1, F_OFFDAC_LED2,
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/* sentinel */
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F_MAX_FIELDS
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};
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static const struct reg_field afe4404_reg_fields[] = {
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/* Gains */
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[F_TIA_GAIN_SEP] = REG_FIELD(AFE4404_TIA_GAIN_SEP, 0, 2),
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[F_TIA_CF_SEP] = REG_FIELD(AFE4404_TIA_GAIN_SEP, 3, 5),
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[F_TIA_GAIN] = REG_FIELD(AFE4404_TIA_GAIN, 0, 2),
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[TIA_CF] = REG_FIELD(AFE4404_TIA_GAIN, 3, 5),
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/* LED Current */
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[F_ILED1] = REG_FIELD(AFE440X_LEDCNTRL, 0, 5),
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[F_ILED2] = REG_FIELD(AFE440X_LEDCNTRL, 6, 11),
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[F_ILED3] = REG_FIELD(AFE440X_LEDCNTRL, 12, 17),
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/* Offset DAC */
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[F_OFFDAC_AMB2] = REG_FIELD(AFE4404_OFFDAC, 0, 4),
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[F_OFFDAC_LED1] = REG_FIELD(AFE4404_OFFDAC, 5, 9),
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[F_OFFDAC_AMB1] = REG_FIELD(AFE4404_OFFDAC, 10, 14),
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[F_OFFDAC_LED2] = REG_FIELD(AFE4404_OFFDAC, 15, 19),
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};
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/**
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* struct afe4404_data - AFE4404 device instance data
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* @dev: Device structure
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* @regmap: Register map of the device
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* @fields: Register fields of the device
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* @regulator: Pointer to the regulator for the IC
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* @trig: IIO trigger for this device
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* @irq: ADC_RDY line interrupt number
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* @buffer: Used to construct a scan to push to the iio buffer.
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*/
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struct afe4404_data {
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struct device *dev;
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struct regmap *regmap;
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struct regmap_field *fields[F_MAX_FIELDS];
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struct regulator *regulator;
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struct iio_trigger *trig;
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int irq;
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s32 buffer[10] __aligned(8);
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};
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enum afe4404_chan_id {
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LED2 = 1,
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ALED2,
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LED1,
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ALED1,
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LED2_ALED2,
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LED1_ALED1,
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};
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static const unsigned int afe4404_channel_values[] = {
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[LED2] = AFE440X_LED2VAL,
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[ALED2] = AFE440X_ALED2VAL,
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[LED1] = AFE440X_LED1VAL,
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[ALED1] = AFE440X_ALED1VAL,
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[LED2_ALED2] = AFE440X_LED2_ALED2VAL,
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[LED1_ALED1] = AFE440X_LED1_ALED1VAL,
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};
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static const unsigned int afe4404_channel_leds[] = {
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[LED2] = F_ILED2,
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[ALED2] = F_ILED3,
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[LED1] = F_ILED1,
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};
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static const unsigned int afe4404_channel_offdacs[] = {
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[LED2] = F_OFFDAC_LED2,
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[ALED2] = F_OFFDAC_AMB2,
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[LED1] = F_OFFDAC_LED1,
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[ALED1] = F_OFFDAC_AMB1,
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};
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static const struct iio_chan_spec afe4404_channels[] = {
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/* ADC values */
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AFE440X_INTENSITY_CHAN(LED2, BIT(IIO_CHAN_INFO_OFFSET)),
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AFE440X_INTENSITY_CHAN(ALED2, BIT(IIO_CHAN_INFO_OFFSET)),
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AFE440X_INTENSITY_CHAN(LED1, BIT(IIO_CHAN_INFO_OFFSET)),
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AFE440X_INTENSITY_CHAN(ALED1, BIT(IIO_CHAN_INFO_OFFSET)),
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AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
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AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
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/* LED current */
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AFE440X_CURRENT_CHAN(LED2),
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AFE440X_CURRENT_CHAN(ALED2),
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AFE440X_CURRENT_CHAN(LED1),
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};
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static const struct afe440x_val_table afe4404_res_table[] = {
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{ .integer = 500000, .fract = 0 },
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{ .integer = 250000, .fract = 0 },
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{ .integer = 100000, .fract = 0 },
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{ .integer = 50000, .fract = 0 },
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{ .integer = 25000, .fract = 0 },
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{ .integer = 10000, .fract = 0 },
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{ .integer = 1000000, .fract = 0 },
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{ .integer = 2000000, .fract = 0 },
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};
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AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4404_res_table);
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static const struct afe440x_val_table afe4404_cap_table[] = {
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{ .integer = 0, .fract = 5000 },
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{ .integer = 0, .fract = 2500 },
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{ .integer = 0, .fract = 10000 },
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{ .integer = 0, .fract = 7500 },
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{ .integer = 0, .fract = 20000 },
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{ .integer = 0, .fract = 17500 },
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{ .integer = 0, .fract = 25000 },
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{ .integer = 0, .fract = 22500 },
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};
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AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4404_cap_table);
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static ssize_t afe440x_show_register(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct afe4404_data *afe = iio_priv(indio_dev);
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struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
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unsigned int reg_val;
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int vals[2];
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int ret;
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ret = regmap_field_read(afe->fields[afe440x_attr->field], ®_val);
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if (ret)
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return ret;
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if (reg_val >= afe440x_attr->table_size)
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return -EINVAL;
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vals[0] = afe440x_attr->val_table[reg_val].integer;
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vals[1] = afe440x_attr->val_table[reg_val].fract;
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return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
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}
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static ssize_t afe440x_store_register(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct afe4404_data *afe = iio_priv(indio_dev);
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struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
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int val, integer, fract, ret;
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ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
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if (ret)
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return ret;
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for (val = 0; val < afe440x_attr->table_size; val++)
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if (afe440x_attr->val_table[val].integer == integer &&
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afe440x_attr->val_table[val].fract == fract)
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break;
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if (val == afe440x_attr->table_size)
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return -EINVAL;
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ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
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if (ret)
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return ret;
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return count;
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}
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static AFE440X_ATTR(in_intensity1_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
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static AFE440X_ATTR(in_intensity1_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
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static AFE440X_ATTR(in_intensity2_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
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static AFE440X_ATTR(in_intensity2_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
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static AFE440X_ATTR(in_intensity3_resistance, F_TIA_GAIN, afe4404_res_table);
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static AFE440X_ATTR(in_intensity3_capacitance, TIA_CF, afe4404_cap_table);
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static AFE440X_ATTR(in_intensity4_resistance, F_TIA_GAIN, afe4404_res_table);
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static AFE440X_ATTR(in_intensity4_capacitance, TIA_CF, afe4404_cap_table);
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static struct attribute *afe440x_attributes[] = {
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&dev_attr_in_intensity_resistance_available.attr,
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&dev_attr_in_intensity_capacitance_available.attr,
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&afe440x_attr_in_intensity1_resistance.dev_attr.attr,
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&afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
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&afe440x_attr_in_intensity2_resistance.dev_attr.attr,
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&afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
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&afe440x_attr_in_intensity3_resistance.dev_attr.attr,
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&afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
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&afe440x_attr_in_intensity4_resistance.dev_attr.attr,
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&afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
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NULL
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};
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static const struct attribute_group afe440x_attribute_group = {
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.attrs = afe440x_attributes
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};
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static int afe4404_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct afe4404_data *afe = iio_priv(indio_dev);
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unsigned int value_reg, led_field, offdac_field;
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int ret;
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switch (chan->type) {
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case IIO_INTENSITY:
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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value_reg = afe4404_channel_values[chan->address];
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ret = regmap_read(afe->regmap, value_reg, val);
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if (ret)
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_OFFSET:
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offdac_field = afe4404_channel_offdacs[chan->address];
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ret = regmap_field_read(afe->fields[offdac_field], val);
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if (ret)
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return ret;
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return IIO_VAL_INT;
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}
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break;
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case IIO_CURRENT:
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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led_field = afe4404_channel_leds[chan->address];
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ret = regmap_field_read(afe->fields[led_field], val);
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if (ret)
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = 800000;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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break;
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default:
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break;
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}
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return -EINVAL;
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}
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static int afe4404_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct afe4404_data *afe = iio_priv(indio_dev);
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unsigned int led_field, offdac_field;
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switch (chan->type) {
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case IIO_INTENSITY:
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switch (mask) {
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case IIO_CHAN_INFO_OFFSET:
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offdac_field = afe4404_channel_offdacs[chan->address];
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return regmap_field_write(afe->fields[offdac_field], val);
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}
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break;
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case IIO_CURRENT:
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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led_field = afe4404_channel_leds[chan->address];
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return regmap_field_write(afe->fields[led_field], val);
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}
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break;
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default:
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break;
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}
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return -EINVAL;
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}
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static const struct iio_info afe4404_iio_info = {
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.attrs = &afe440x_attribute_group,
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.read_raw = afe4404_read_raw,
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.write_raw = afe4404_write_raw,
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};
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static irqreturn_t afe4404_trigger_handler(int irq, void *private)
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{
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struct iio_poll_func *pf = private;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct afe4404_data *afe = iio_priv(indio_dev);
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int ret, bit, i = 0;
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for_each_set_bit(bit, indio_dev->active_scan_mask,
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indio_dev->masklength) {
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ret = regmap_read(afe->regmap, afe4404_channel_values[bit],
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&afe->buffer[i++]);
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if (ret)
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goto err;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, afe->buffer,
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pf->timestamp);
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err:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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/* Default timings from data-sheet */
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#define AFE4404_TIMING_PAIRS \
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{ AFE440X_PRPCOUNT, 39999 }, \
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{ AFE440X_LED2LEDSTC, 0 }, \
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{ AFE440X_LED2LEDENDC, 398 }, \
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{ AFE440X_LED2STC, 80 }, \
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{ AFE440X_LED2ENDC, 398 }, \
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{ AFE440X_ADCRSTSTCT0, 5600 }, \
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{ AFE440X_ADCRSTENDCT0, 5606 }, \
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{ AFE440X_LED2CONVST, 5607 }, \
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{ AFE440X_LED2CONVEND, 6066 }, \
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{ AFE4404_LED3LEDSTC, 400 }, \
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{ AFE4404_LED3LEDENDC, 798 }, \
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{ AFE440X_ALED2STC, 480 }, \
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{ AFE440X_ALED2ENDC, 798 }, \
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{ AFE440X_ADCRSTSTCT1, 6068 }, \
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{ AFE440X_ADCRSTENDCT1, 6074 }, \
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{ AFE440X_ALED2CONVST, 6075 }, \
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{ AFE440X_ALED2CONVEND, 6534 }, \
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{ AFE440X_LED1LEDSTC, 800 }, \
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{ AFE440X_LED1LEDENDC, 1198 }, \
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{ AFE440X_LED1STC, 880 }, \
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{ AFE440X_LED1ENDC, 1198 }, \
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{ AFE440X_ADCRSTSTCT2, 6536 }, \
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{ AFE440X_ADCRSTENDCT2, 6542 }, \
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{ AFE440X_LED1CONVST, 6543 }, \
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{ AFE440X_LED1CONVEND, 7003 }, \
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{ AFE440X_ALED1STC, 1280 }, \
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{ AFE440X_ALED1ENDC, 1598 }, \
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{ AFE440X_ADCRSTSTCT3, 7005 }, \
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{ AFE440X_ADCRSTENDCT3, 7011 }, \
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{ AFE440X_ALED1CONVST, 7012 }, \
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{ AFE440X_ALED1CONVEND, 7471 }, \
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{ AFE440X_PDNCYCLESTC, 7671 }, \
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{ AFE440X_PDNCYCLEENDC, 39199 }
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static const struct reg_sequence afe4404_reg_sequences[] = {
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AFE4404_TIMING_PAIRS,
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{ AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
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{ AFE4404_TIA_GAIN_SEP, AFE440X_TIAGAIN_ENSEPGAIN },
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{ AFE440X_CONTROL2, AFE440X_CONTROL2_OSC_ENABLE },
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};
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static const struct regmap_range afe4404_yes_ranges[] = {
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regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
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regmap_reg_range(AFE4404_AVG_LED2_ALED2VAL, AFE4404_AVG_LED1_ALED1VAL),
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};
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static const struct regmap_access_table afe4404_volatile_table = {
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.yes_ranges = afe4404_yes_ranges,
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.n_yes_ranges = ARRAY_SIZE(afe4404_yes_ranges),
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};
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static const struct regmap_config afe4404_regmap_config = {
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.reg_bits = 8,
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.val_bits = 24,
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.max_register = AFE4404_AVG_LED1_ALED1VAL,
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.cache_type = REGCACHE_RBTREE,
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.volatile_table = &afe4404_volatile_table,
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};
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static const struct of_device_id afe4404_of_match[] = {
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{ .compatible = "ti,afe4404", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, afe4404_of_match);
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static int afe4404_suspend(struct device *dev)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
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struct afe4404_data *afe = iio_priv(indio_dev);
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int ret;
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ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
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AFE440X_CONTROL2_PDN_AFE,
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AFE440X_CONTROL2_PDN_AFE);
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if (ret)
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return ret;
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ret = regulator_disable(afe->regulator);
|
|
if (ret) {
|
|
dev_err(dev, "Unable to disable regulator\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int afe4404_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct afe4404_data *afe = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = regulator_enable(afe->regulator);
|
|
if (ret) {
|
|
dev_err(dev, "Unable to enable regulator\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
|
|
AFE440X_CONTROL2_PDN_AFE, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static DEFINE_SIMPLE_DEV_PM_OPS(afe4404_pm_ops, afe4404_suspend,
|
|
afe4404_resume);
|
|
|
|
static int afe4404_probe(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev;
|
|
struct afe4404_data *afe;
|
|
int i, ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*afe));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
afe = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
|
|
afe->dev = &client->dev;
|
|
afe->irq = client->irq;
|
|
|
|
afe->regmap = devm_regmap_init_i2c(client, &afe4404_regmap_config);
|
|
if (IS_ERR(afe->regmap)) {
|
|
dev_err(afe->dev, "Unable to allocate register map\n");
|
|
return PTR_ERR(afe->regmap);
|
|
}
|
|
|
|
for (i = 0; i < F_MAX_FIELDS; i++) {
|
|
afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
|
|
afe4404_reg_fields[i]);
|
|
if (IS_ERR(afe->fields[i])) {
|
|
dev_err(afe->dev, "Unable to allocate regmap fields\n");
|
|
return PTR_ERR(afe->fields[i]);
|
|
}
|
|
}
|
|
|
|
afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
|
|
if (IS_ERR(afe->regulator))
|
|
return dev_err_probe(afe->dev, PTR_ERR(afe->regulator),
|
|
"Unable to get regulator\n");
|
|
|
|
ret = regulator_enable(afe->regulator);
|
|
if (ret) {
|
|
dev_err(afe->dev, "Unable to enable regulator\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
|
|
AFE440X_CONTROL0_SW_RESET);
|
|
if (ret) {
|
|
dev_err(afe->dev, "Unable to reset device\n");
|
|
goto disable_reg;
|
|
}
|
|
|
|
ret = regmap_multi_reg_write(afe->regmap, afe4404_reg_sequences,
|
|
ARRAY_SIZE(afe4404_reg_sequences));
|
|
if (ret) {
|
|
dev_err(afe->dev, "Unable to set register defaults\n");
|
|
goto disable_reg;
|
|
}
|
|
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = afe4404_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(afe4404_channels);
|
|
indio_dev->name = AFE4404_DRIVER_NAME;
|
|
indio_dev->info = &afe4404_iio_info;
|
|
|
|
if (afe->irq > 0) {
|
|
afe->trig = devm_iio_trigger_alloc(afe->dev,
|
|
"%s-dev%d",
|
|
indio_dev->name,
|
|
iio_device_id(indio_dev));
|
|
if (!afe->trig) {
|
|
dev_err(afe->dev, "Unable to allocate IIO trigger\n");
|
|
ret = -ENOMEM;
|
|
goto disable_reg;
|
|
}
|
|
|
|
iio_trigger_set_drvdata(afe->trig, indio_dev);
|
|
|
|
ret = iio_trigger_register(afe->trig);
|
|
if (ret) {
|
|
dev_err(afe->dev, "Unable to register IIO trigger\n");
|
|
goto disable_reg;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(afe->dev, afe->irq,
|
|
iio_trigger_generic_data_rdy_poll,
|
|
NULL, IRQF_ONESHOT,
|
|
AFE4404_DRIVER_NAME,
|
|
afe->trig);
|
|
if (ret) {
|
|
dev_err(afe->dev, "Unable to request IRQ\n");
|
|
goto disable_reg;
|
|
}
|
|
}
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
|
|
afe4404_trigger_handler, NULL);
|
|
if (ret) {
|
|
dev_err(afe->dev, "Unable to setup buffer\n");
|
|
goto unregister_trigger;
|
|
}
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret) {
|
|
dev_err(afe->dev, "Unable to register IIO device\n");
|
|
goto unregister_triggered_buffer;
|
|
}
|
|
|
|
return 0;
|
|
|
|
unregister_triggered_buffer:
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
unregister_trigger:
|
|
if (afe->irq > 0)
|
|
iio_trigger_unregister(afe->trig);
|
|
disable_reg:
|
|
regulator_disable(afe->regulator);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void afe4404_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
struct afe4404_data *afe = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
|
|
if (afe->irq > 0)
|
|
iio_trigger_unregister(afe->trig);
|
|
|
|
ret = regulator_disable(afe->regulator);
|
|
if (ret)
|
|
dev_err(afe->dev, "Unable to disable regulator\n");
|
|
}
|
|
|
|
static const struct i2c_device_id afe4404_ids[] = {
|
|
{ "afe4404", 0 },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, afe4404_ids);
|
|
|
|
static struct i2c_driver afe4404_i2c_driver = {
|
|
.driver = {
|
|
.name = AFE4404_DRIVER_NAME,
|
|
.of_match_table = afe4404_of_match,
|
|
.pm = pm_sleep_ptr(&afe4404_pm_ops),
|
|
},
|
|
.probe = afe4404_probe,
|
|
.remove = afe4404_remove,
|
|
.id_table = afe4404_ids,
|
|
};
|
|
module_i2c_driver(afe4404_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
|
|
MODULE_DESCRIPTION("TI AFE4404 Heart Rate Monitor and Pulse Oximeter AFE");
|
|
MODULE_LICENSE("GPL v2");
|