/*
* AFE4404 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/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.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 AFE4404_DRIVER_NAME "afe4404"
/* AFE4404 registers */
#define AFE4404_TIA_GAIN_SEP 0x20
#define AFE4404_TIA_GAIN 0x21
#define AFE4404_PROG_TG_STC 0x34
#define AFE4404_PROG_TG_ENDC 0x35
#define AFE4404_LED3LEDSTC 0x36
#define AFE4404_LED3LEDENDC 0x37
#define AFE4404_CLKDIV_PRF 0x39
#define AFE4404_OFFDAC 0x3a
#define AFE4404_DEC 0x3d
#define AFE4404_AVG_LED2_ALED2VAL 0x3f
#define AFE4404_AVG_LED1_ALED1VAL 0x40
/* AFE4404 GAIN register fields */
#define AFE4404_TIA_GAIN_RES_MASK GENMASK(2, 0)
#define AFE4404_TIA_GAIN_RES_SHIFT 0
#define AFE4404_TIA_GAIN_CAP_MASK GENMASK(5, 3)
#define AFE4404_TIA_GAIN_CAP_SHIFT 3
/* AFE4404 LEDCNTRL register fields */
#define AFE4404_LEDCNTRL_ILED1_MASK GENMASK(5, 0)
#define AFE4404_LEDCNTRL_ILED1_SHIFT 0
#define AFE4404_LEDCNTRL_ILED2_MASK GENMASK(11, 6)
#define AFE4404_LEDCNTRL_ILED2_SHIFT 6
#define AFE4404_LEDCNTRL_ILED3_MASK GENMASK(17, 12)
#define AFE4404_LEDCNTRL_ILED3_SHIFT 12
/* AFE4404 CONTROL2 register fields */
#define AFE440X_CONTROL2_ILED_2X_MASK BIT(17)
#define AFE440X_CONTROL2_ILED_2X_SHIFT 17
/* AFE4404 CONTROL3 register fields */
#define AFE440X_CONTROL3_OSC_ENABLE BIT(9)
/* AFE4404 OFFDAC register current fields */
#define AFE4404_OFFDAC_CURR_LED1_MASK GENMASK(9, 5)
#define AFE4404_OFFDAC_CURR_LED1_SHIFT 5
#define AFE4404_OFFDAC_CURR_LED2_MASK GENMASK(19, 15)
#define AFE4404_OFFDAC_CURR_LED2_SHIFT 15
#define AFE4404_OFFDAC_CURR_LED3_MASK GENMASK(4, 0)
#define AFE4404_OFFDAC_CURR_LED3_SHIFT 0
#define AFE4404_OFFDAC_CURR_ALED1_MASK GENMASK(14, 10)
#define AFE4404_OFFDAC_CURR_ALED1_SHIFT 10
#define AFE4404_OFFDAC_CURR_ALED2_MASK GENMASK(4, 0)
#define AFE4404_OFFDAC_CURR_ALED2_SHIFT 0
/* AFE4404 NULL fields */
#define NULL_MASK 0
#define NULL_SHIFT 0
/* AFE4404 TIA_GAIN_CAP values */
#define AFE4404_TIA_GAIN_CAP_5_P 0x0
#define AFE4404_TIA_GAIN_CAP_2_5_P 0x1
#define AFE4404_TIA_GAIN_CAP_10_P 0x2
#define AFE4404_TIA_GAIN_CAP_7_5_P 0x3
#define AFE4404_TIA_GAIN_CAP_20_P 0x4
#define AFE4404_TIA_GAIN_CAP_17_5_P 0x5
#define AFE4404_TIA_GAIN_CAP_25_P 0x6
#define AFE4404_TIA_GAIN_CAP_22_5_P 0x7
/* AFE4404 TIA_GAIN_RES values */
#define AFE4404_TIA_GAIN_RES_500_K 0x0
#define AFE4404_TIA_GAIN_RES_250_K 0x1
#define AFE4404_TIA_GAIN_RES_100_K 0x2
#define AFE4404_TIA_GAIN_RES_50_K 0x3
#define AFE4404_TIA_GAIN_RES_25_K 0x4
#define AFE4404_TIA_GAIN_RES_10_K 0x5
#define AFE4404_TIA_GAIN_RES_1_M 0x6
#define AFE4404_TIA_GAIN_RES_2_M 0x7
/**
* struct afe4404_data
* @dev - Device structure
* @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 afe4404_data {
struct device *dev;
struct regmap *regmap;
struct regulator *regulator;
struct iio_trigger *trig;
int irq;
};
enum afe4404_chan_id {
LED1,
ALED1,
LED2,
ALED2,
LED3,
LED1_ALED1,
LED2_ALED2,
ILED1,
ILED2,
ILED3,
};
static const struct afe440x_reg_info afe4404_reg_info[] = {
[LED1] = AFE440X_REG_INFO(AFE440X_LED1VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_LED1),
[ALED1] = AFE440X_REG_INFO(AFE440X_ALED1VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_ALED1),
[LED2] = AFE440X_REG_INFO(AFE440X_LED2VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_LED2),
[ALED2] = AFE440X_REG_INFO(AFE440X_ALED2VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_ALED2),
[LED3] = 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, AFE4404_LEDCNTRL_ILED1),
[ILED2] = AFE440X_REG_INFO(AFE440X_LEDCNTRL, 0, AFE4404_LEDCNTRL_ILED2),
[ILED3] = AFE440X_REG_INFO(AFE440X_LEDCNTRL, 0, AFE4404_LEDCNTRL_ILED3),
};
static const struct iio_chan_spec afe4404_channels[] = {
/* ADC values */
AFE440X_INTENSITY_CHAN(LED1, "led1", BIT(IIO_CHAN_INFO_OFFSET)),
AFE440X_INTENSITY_CHAN(ALED1, "led1_ambient", BIT(IIO_CHAN_INFO_OFFSET)),
AFE440X_INTENSITY_CHAN(LED2, "led2", BIT(IIO_CHAN_INFO_OFFSET)),
AFE440X_INTENSITY_CHAN(ALED2, "led2_ambient", BIT(IIO_CHAN_INFO_OFFSET)),
AFE440X_INTENSITY_CHAN(LED3, "led3", BIT(IIO_CHAN_INFO_OFFSET)),
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"),
AFE440X_CURRENT_CHAN(ILED3, "led3"),
};
static const struct afe440x_val_table afe4404_res_table[] = {
{ .integer = 500000, .fract = 0 },
{ .integer = 250000, .fract = 0 },
{ .integer = 100000, .fract = 0 },
{ .integer = 50000, .fract = 0 },
{ .integer = 25000, .fract = 0 },
{ .integer = 10000, .fract = 0 },
{ .integer = 1000000, .fract = 0 },
{ .integer = 2000000, .fract = 0 },
};
AFE440X_TABLE_ATTR(tia_resistance_available, afe4404_res_table);
static const struct afe440x_val_table afe4404_cap_table[] = {
{ .integer = 0, .fract = 5000 },
{ .integer = 0, .fract = 2500 },
{ .integer = 0, .fract = 10000 },
{ .integer = 0, .fract = 7500 },
{ .integer = 0, .fract = 20000 },
{ .integer = 0, .fract = 17500 },
{ .integer = 0, .fract = 25000 },
{ .integer = 0, .fract = 22500 },
};
AFE440X_TABLE_ATTR(tia_capacitance_available, afe4404_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 afe4404_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 -EINVAL;
default:
return -EINVAL;
}
return iio_format_value(buf, type, val_len, vals);
}
static ssize_t afe440x_store_register(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct afe4404_data *afe = iio_priv(indio_dev);
struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
int val, integer, fract, ret;
ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
if (ret)
return ret;
switch (afe440x_attr->type) {
case SIMPLE:
val = integer;
break;
case RESISTANCE:
case CAPACITANCE:
for (val = 0; val < afe440x_attr->table_size; val++)
if (afe440x_attr->val_table[val].integer == integer &&
afe440x_attr->val_table[val].fract == fract)
break;
if (val == afe440x_attr->table_size)
return -EINVAL;
break;
default:
return -EINVAL;
}
ret = regmap_update_bits(afe->regmap, afe440x_attr->reg,
afe440x_attr->mask,
(val << afe440x_attr->shift));
if (ret)
return ret;
return count;
}
static AFE440X_ATTR(tia_separate_en, AFE4404_TIA_GAIN_SEP, AFE440X_TIAGAIN_ENSEPGAIN, SIMPLE, NULL, 0);
static AFE440X_ATTR(tia_resistance1, AFE4404_TIA_GAIN, AFE4404_TIA_GAIN_RES, RESISTANCE, afe4404_res_table, ARRAY_SIZE(afe4404_res_table));
static AFE440X_ATTR(tia_capacitance1, AFE4404_TIA_GAIN, AFE4404_TIA_GAIN_CAP, CAPACITANCE, afe4404_cap_table, ARRAY_SIZE(afe4404_cap_table));
static AFE440X_ATTR(tia_resistance2, AFE4404_TIA_GAIN_SEP, AFE4404_TIA_GAIN_RES, RESISTANCE, afe4404_res_table, ARRAY_SIZE(afe4404_res_table));
static AFE440X_ATTR(tia_capacitance2, AFE4404_TIA_GAIN_SEP, AFE4404_TIA_GAIN_CAP, CAPACITANCE, afe4404_cap_table, ARRAY_SIZE(afe4404_cap_table));
static struct attribute *afe440x_attributes[] = {
&afe440x_attr_tia_separate_en.dev_attr.attr,
&afe440x_attr_tia_resistance1.dev_attr.attr,
&afe440x_attr_tia_capacitance1.dev_attr.attr,
&afe440x_attr_tia_resistance2.dev_attr.attr,
&afe440x_attr_tia_capacitance2.dev_attr.attr,
&dev_attr_tia_resistance_available.attr,
&dev_attr_tia_capacitance_available.attr,
NULL
};
static const struct attribute_group afe440x_attribute_group = {
.attrs = afe440x_attributes
};
static int afe4404_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct afe4404_data *afe = iio_priv(indio_dev);
const struct afe440x_reg_info reg_info = afe4404_reg_info[chan->address];
int ret;
switch (chan->type) {
case IIO_INTENSITY:
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = regmap_read(afe->regmap, reg_info.reg, val);
if (ret)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
ret = regmap_read(afe->regmap, reg_info.offreg,
val);
if (ret)
return ret;
*val &= reg_info.mask;
*val >>= reg_info.shift;
return IIO_VAL_INT;
}
break;
case IIO_CURRENT:
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = regmap_read(afe->regmap, reg_info.reg, val);
if (ret)
return ret;
*val &= reg_info.mask;
*val >>= reg_info.shift;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
*val2 = 800000;
return IIO_VAL_INT_PLUS_MICRO;
}
break;
default:
break;
}
return -EINVAL;
}
static int afe4404_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct afe4404_data *afe = iio_priv(indio_dev);
const struct afe440x_reg_info reg_info = afe4404_reg_info[chan->address];
switch (chan->type) {
case IIO_INTENSITY:
switch (mask) {
case IIO_CHAN_INFO_OFFSET:
return regmap_update_bits(afe->regmap,
reg_info.offreg,
reg_info.mask,
(val << reg_info.shift));
}
break;
case IIO_CURRENT:
switch (mask) {
case IIO_CHAN_INFO_RAW:
return regmap_update_bits(afe->regmap,
reg_info.reg,
reg_info.mask,
(val << reg_info.shift));
}
break;
default:
break;
}
return -EINVAL;
}
static const struct iio_info afe4404_iio_info = {
.attrs = &afe440x_attribute_group,
.read_raw = afe4404_read_raw,
.write_raw = afe4404_write_raw,
.driver_module = THIS_MODULE,
};
static irqreturn_t afe4404_trigger_handler(int irq, void *private)
{
struct iio_poll_func *pf = private;
struct iio_dev *indio_dev = pf->indio_dev;
struct afe4404_data *afe = iio_priv(indio_dev);
int ret, bit, i = 0;
s32 buffer[10];
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength) {
ret = regmap_read(afe->regmap, afe4404_reg_info[bit].reg,
&buffer[i++]);
if (ret)
goto err;
}
iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp);
err:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static const struct iio_trigger_ops afe4404_trigger_ops = {
.owner = THIS_MODULE,
};
/* Default timings from data-sheet */
#define AFE4404_TIMING_PAIRS \
{ AFE440X_PRPCOUNT, 39999 }, \
{ AFE440X_LED2LEDSTC, 0 }, \
{ AFE440X_LED2LEDENDC, 398 }, \
{ AFE440X_LED2STC, 80 }, \
{ AFE440X_LED2ENDC, 398 }, \
{ AFE440X_ADCRSTSTCT0, 5600 }, \
{ AFE440X_ADCRSTENDCT0, 5606 }, \
{ AFE440X_LED2CONVST, 5607 }, \
{ AFE440X_LED2CONVEND, 6066 }, \
{ AFE4404_LED3LEDSTC, 400 }, \
{ AFE4404_LED3LEDENDC, 798 }, \
{ AFE440X_ALED2STC, 480 }, \
{ AFE440X_ALED2ENDC, 798 }, \
{ AFE440X_ADCRSTSTCT1, 6068 }, \
{ AFE440X_ADCRSTENDCT1, 6074 }, \
{ AFE440X_ALED2CONVST, 6075 }, \
{ AFE440X_ALED2CONVEND, 6534 }, \
{ AFE440X_LED1LEDSTC, 800 }, \
{ AFE440X_LED1LEDENDC, 1198 }, \
{ AFE440X_LED1STC, 880 }, \
{ AFE440X_LED1ENDC, 1198 }, \
{ AFE440X_ADCRSTSTCT2, 6536 }, \
{ AFE440X_ADCRSTENDCT2, 6542 }, \
{ AFE440X_LED1CONVST, 6543 }, \
{ AFE440X_LED1CONVEND, 7003 }, \
{ AFE440X_ALED1STC, 1280 }, \
{ AFE440X_ALED1ENDC, 1598 }, \
{ AFE440X_ADCRSTSTCT3, 7005 }, \
{ AFE440X_ADCRSTENDCT3, 7011 }, \
{ AFE440X_ALED1CONVST, 7012 }, \
{ AFE440X_ALED1CONVEND, 7471 }, \
{ AFE440X_PDNCYCLESTC, 7671 }, \
{ AFE440X_PDNCYCLEENDC, 39199 }
static const struct reg_sequence afe4404_reg_sequences[] = {
AFE4404_TIMING_PAIRS,
{ AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
{ AFE4404_TIA_GAIN, AFE4404_TIA_GAIN_RES_50_K },
{ AFE440X_LEDCNTRL, (0xf << AFE4404_LEDCNTRL_ILED1_SHIFT) |
(0x3 << AFE4404_LEDCNTRL_ILED2_SHIFT) |
(0x3 << AFE4404_LEDCNTRL_ILED3_SHIFT) },
{ AFE440X_CONTROL2, AFE440X_CONTROL3_OSC_ENABLE },
};
static const struct regmap_range afe4404_yes_ranges[] = {
regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
regmap_reg_range(AFE4404_AVG_LED2_ALED2VAL, AFE4404_AVG_LED1_ALED1VAL),
};
static const struct regmap_access_table afe4404_volatile_table = {
.yes_ranges = afe4404_yes_ranges,
.n_yes_ranges = ARRAY_SIZE(afe4404_yes_ranges),
};
static const struct regmap_config afe4404_regmap_config = {
.reg_bits = 8,
.val_bits = 24,
.max_register = AFE4404_AVG_LED1_ALED1VAL,
.cache_type = REGCACHE_RBTREE,
.volatile_table = &afe4404_volatile_table,
};
#ifdef CONFIG_OF
static const struct of_device_id afe4404_of_match[] = {
{ .compatible = "ti,afe4404", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, afe4404_of_match);
#endif
static int __maybe_unused afe4404_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct afe4404_data *afe = iio_priv(indio_dev);
int ret;
ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
AFE440X_CONTROL2_PDN_AFE,
AFE440X_CONTROL2_PDN_AFE);
if (ret)
return ret;
ret = regulator_disable(afe->regulator);
if (ret) {
dev_err(dev, "Unable to disable regulator\n");
return ret;
}
return 0;
}
static int __maybe_unused afe4404_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_to_iio_dev(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 SIMPLE_DEV_PM_OPS(afe4404_pm_ops, afe4404_suspend, afe4404_resume);
static int afe4404_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct iio_dev *indio_dev;
struct afe4404_data *afe;
int 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);
}
afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
if (IS_ERR(afe->regulator)) {
dev_err(afe->dev, "Unable to get regulator\n");
return PTR_ERR(afe->regulator);
}
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->dev.parent = afe->dev;
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,
indio_dev->id);
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);
afe->trig->ops = &afe4404_trigger_ops;
afe->trig->dev.parent = afe->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 int 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");
return ret;
}
return 0;
}
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 = of_match_ptr(afe4404_of_match),
.pm = &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 and Pulse Oximeter");
MODULE_LICENSE("GPL v2");
