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/*
* AFE4403 Heart Rate Monitors and Low-Cost Pulse Oximeters
*
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
* Andrew F. Davis <afd@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/sysfs.h>
#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include "afe440x.h"
#define AFE4403_DRIVER_NAME "afe4403"
/* AFE4403 Registers */
#define AFE4403_TIAGAIN 0x20
#define AFE4403_TIA_AMB_GAIN 0x21
/* AFE4403 GAIN register fields */
#define AFE4403_TIAGAIN_RES_MASK GENMASK(2, 0)
#define AFE4403_TIAGAIN_RES_SHIFT 0
#define AFE4403_TIAGAIN_CAP_MASK GENMASK(7, 3)
#define AFE4403_TIAGAIN_CAP_SHIFT 3
/* AFE4403 LEDCNTRL register fields */
#define AFE440X_LEDCNTRL_LED1_MASK GENMASK(15, 8)
#define AFE440X_LEDCNTRL_LED1_SHIFT 8
#define AFE440X_LEDCNTRL_LED2_MASK GENMASK(7, 0)
#define AFE440X_LEDCNTRL_LED2_SHIFT 0
#define AFE440X_LEDCNTRL_LED_RANGE_MASK GENMASK(17, 16)
#define AFE440X_LEDCNTRL_LED_RANGE_SHIFT 16
/* AFE4403 CONTROL2 register fields */
#define AFE440X_CONTROL2_PWR_DWN_TX BIT(2)
#define AFE440X_CONTROL2_EN_SLOW_DIAG BIT(8)
#define AFE440X_CONTROL2_DIAG_OUT_TRI BIT(10)
#define AFE440X_CONTROL2_TX_BRDG_MOD BIT(11)
#define AFE440X_CONTROL2_TX_REF_MASK GENMASK(18, 17)
#define AFE440X_CONTROL2_TX_REF_SHIFT 17
/* AFE4404 NULL fields */
#define NULL_MASK 0
#define NULL_SHIFT 0
/* AFE4403 LEDCNTRL values */
#define AFE440X_LEDCNTRL_RANGE_TX_HALF 0x1
#define AFE440X_LEDCNTRL_RANGE_TX_FULL 0x2
#define AFE440X_LEDCNTRL_RANGE_TX_OFF 0x3
/* AFE4403 CONTROL2 values */
#define AFE440X_CONTROL2_TX_REF_025 0x0
#define AFE440X_CONTROL2_TX_REF_050 0x1
#define AFE440X_CONTROL2_TX_REF_100 0x2
#define AFE440X_CONTROL2_TX_REF_075 0x3
/* AFE4403 CONTROL3 values */
#define AFE440X_CONTROL3_CLK_DIV_2 0x0
#define AFE440X_CONTROL3_CLK_DIV_4 0x2
#define AFE440X_CONTROL3_CLK_DIV_6 0x3
#define AFE440X_CONTROL3_CLK_DIV_8 0x4
#define AFE440X_CONTROL3_CLK_DIV_12 0x5
#define AFE440X_CONTROL3_CLK_DIV_1 0x7
/* AFE4403 TIAGAIN_CAP values */
#define AFE4403_TIAGAIN_CAP_5_P 0x0
#define AFE4403_TIAGAIN_CAP_10_P 0x1
#define AFE4403_TIAGAIN_CAP_20_P 0x2
#define AFE4403_TIAGAIN_CAP_30_P 0x3
#define AFE4403_TIAGAIN_CAP_55_P 0x8
#define AFE4403_TIAGAIN_CAP_155_P 0x10
/* AFE4403 TIAGAIN_RES values */
#define AFE4403_TIAGAIN_RES_500_K 0x0
#define AFE4403_TIAGAIN_RES_250_K 0x1
#define AFE4403_TIAGAIN_RES_100_K 0x2
#define AFE4403_TIAGAIN_RES_50_K 0x3
#define AFE4403_TIAGAIN_RES_25_K 0x4
#define AFE4403_TIAGAIN_RES_10_K 0x5
#define AFE4403_TIAGAIN_RES_1_M 0x6
#define AFE4403_TIAGAIN_RES_NONE 0x7
/**
* struct afe4403_data
* @dev - Device structure
* @spi - SPI device handle
* @regmap - Register map of the device
* @regulator - Pointer to the regulator for the IC
* @trig - IIO trigger for this device
* @irq - ADC_RDY line interrupt number
*/
struct afe4403_data {
struct device *dev;
struct spi_device *spi;
struct regmap *regmap;
struct regulator *regulator;
struct iio_trigger *trig;
int irq;
};
enum afe4403_chan_id {
LED1,
ALED1,
LED2,
ALED2,
LED1_ALED1,
LED2_ALED2,
ILED1,
ILED2,
};
static const struct afe440x_reg_info afe4403_reg_info[] = {
[LED1] = AFE440X_REG_INFO(AFE440X_LED1VAL, 0, NULL),
[ALED1] = AFE440X_REG_INFO(AFE440X_ALED1VAL, 0, NULL),
[LED2] = AFE440X_REG_INFO(AFE440X_LED2VAL, 0, NULL),
[ALED2] = AFE440X_REG_INFO(AFE440X_ALED2VAL, 0, NULL),
[LED1_ALED1] = AFE440X_REG_INFO(AFE440X_LED1_ALED1VAL, 0, NULL),
[LED2_ALED2] = AFE440X_REG_INFO(AFE440X_LED2_ALED2VAL, 0, NULL),
[ILED1] = AFE440X_REG_INFO(AFE440X_LEDCNTRL, 0, AFE440X_LEDCNTRL_LED1),
[ILED2] = AFE440X_REG_INFO(AFE440X_LEDCNTRL, 0, AFE440X_LEDCNTRL_LED2),
};
static const struct iio_chan_spec afe4403_channels[] = {
/* ADC values */
AFE440X_INTENSITY_CHAN(LED1, "led1", 0),
AFE440X_INTENSITY_CHAN(ALED1, "led1_ambient", 0),
AFE440X_INTENSITY_CHAN(LED2, "led2", 0),
AFE440X_INTENSITY_CHAN(ALED2, "led2_ambient", 0),
AFE440X_INTENSITY_CHAN(LED1_ALED1, "led1-led1_ambient", 0),
AFE440X_INTENSITY_CHAN(LED2_ALED2, "led2-led2_ambient", 0),
/* LED current */
AFE440X_CURRENT_CHAN(ILED1, "led1"),
AFE440X_CURRENT_CHAN(ILED2, "led2"),
};
static const struct afe440x_val_table afe4403_res_table[] = {
{ 500000 }, { 250000 }, { 100000 }, { 50000 },
{ 25000 }, { 10000 }, { 1000000 }, { 0 },
};
AFE440X_TABLE_ATTR(tia_resistance_available, afe4403_res_table);
static const struct afe440x_val_table afe4403_cap_table[] = {
{ 0, 5000 }, { 0, 10000 }, { 0, 20000 }, { 0, 25000 },
{ 0, 30000 }, { 0, 35000 }, { 0, 45000 }, { 0, 50000 },
{ 0, 55000 }, { 0, 60000 }, { 0, 70000 }, { 0, 75000 },
{ 0, 80000 }, { 0, 85000 }, { 0, 95000 }, { 0, 100000 },
{ 0, 155000 }, { 0, 160000 }, { 0, 170000 }, { 0, 175000 },
{ 0, 180000 }, { 0, 185000 }, { 0, 195000 }, { 0, 200000 },
{ 0, 205000 }, { 0, 210000 }, { 0, 220000 }, { 0, 225000 },
{ 0, 230000 }, { 0, 235000 }, { 0, 245000 }, { 0, 250000 },
};
AFE440X_TABLE_ATTR(tia_capacitance_available, afe4403_cap_table);
static ssize_t afe440x_show_register(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct afe4403_data *afe = iio_priv(indio_dev);
struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
unsigned int reg_val, type;
int vals[2];
int ret, val_len;
ret = regmap_read(afe->regmap, afe440x_attr->reg, ®_val);
if (ret)
return ret;
reg_val &= afe440x_attr->mask;
reg_val >>= afe440x_attr->shift;
switch (afe440x_attr->type) {
case SIMPLE:
type = IIO_VAL_INT;
val_len = 1;
vals[0] = reg_val;
break;
case RESISTANCE:
case CAPACITANCE:
type = IIO_VAL_INT_PLUS_MICRO;
val_len = 2;
if (reg_val < afe440x_attr->table_size) {
vals[0] = afe440x_attr->val_table[reg_val].integer;
vals[1] = afe440x_attr->val_table[reg_val].fract;
break;
}
return
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