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linux/drivers/iio/light/vcnl4035.c

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// SPDX-License-Identifier: GPL-2.0
/*
* VCNL4035 Ambient Light and Proximity Sensor - 7-bit I2C slave address 0x60
*
* Copyright (c) 2018, DENX Software Engineering GmbH
* Author: Parthiban Nallathambi <pn@denx.de>
*
* TODO: Proximity
*/
#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/iio/buffer.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#define VCNL4035_DRV_NAME "vcnl4035"
#define VCNL4035_IRQ_NAME "vcnl4035_event"
#define VCNL4035_REGMAP_NAME "vcnl4035_regmap"
/* Device registers */
#define VCNL4035_ALS_CONF 0x00
#define VCNL4035_ALS_THDH 0x01
#define VCNL4035_ALS_THDL 0x02
#define VCNL4035_ALS_DATA 0x0B
#define VCNL4035_WHITE_DATA 0x0C
#define VCNL4035_INT_FLAG 0x0D
#define VCNL4035_DEV_ID 0x0E
/* Register masks */
#define VCNL4035_MODE_ALS_MASK BIT(0)
#define VCNL4035_MODE_ALS_WHITE_CHAN BIT(8)
#define VCNL4035_MODE_ALS_INT_MASK BIT(1)
#define VCNL4035_ALS_IT_MASK GENMASK(7, 5)
#define VCNL4035_ALS_PERS_MASK GENMASK(3, 2)
#define VCNL4035_INT_ALS_IF_H_MASK BIT(12)
#define VCNL4035_INT_ALS_IF_L_MASK BIT(13)
/* Default values */
#define VCNL4035_MODE_ALS_ENABLE BIT(0)
#define VCNL4035_MODE_ALS_DISABLE 0x00
#define VCNL4035_MODE_ALS_INT_ENABLE BIT(1)
#define VCNL4035_MODE_ALS_INT_DISABLE 0
#define VCNL4035_DEV_ID_VAL 0x80
#define VCNL4035_ALS_IT_DEFAULT 0x01
#define VCNL4035_ALS_PERS_DEFAULT 0x00
#define VCNL4035_ALS_THDH_DEFAULT 5000
#define VCNL4035_ALS_THDL_DEFAULT 100
#define VCNL4035_SLEEP_DELAY_MS 2000
struct vcnl4035_data {
struct i2c_client *client;
struct regmap *regmap;
unsigned int als_it_val;
unsigned int als_persistence;
unsigned int als_thresh_low;
unsigned int als_thresh_high;
struct iio_trigger *drdy_trigger0;
};
static inline bool vcnl4035_is_triggered(struct vcnl4035_data *data)
{
int ret;
int reg;
ret = regmap_read(data->regmap, VCNL4035_INT_FLAG, &reg);
if (ret < 0)
return false;
return !!(reg &
(VCNL4035_INT_ALS_IF_H_MASK | VCNL4035_INT_ALS_IF_L_MASK));
}
static irqreturn_t vcnl4035_drdy_irq_thread(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct vcnl4035_data *data = iio_priv(indio_dev);
if (vcnl4035_is_triggered(data)) {
iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_EITHER),
iio_get_time_ns(indio_dev));
iio_trigger_poll_chained(data->drdy_trigger0);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
/* Triggered buffer */
static irqreturn_t vcnl4035_trigger_consumer_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct vcnl4035_data *data = iio_priv(indio_dev);
u8 buffer[ALIGN(sizeof(u16), sizeof(s64)) + sizeof(s64)];
int ret;
ret = regmap_read(data->regmap, VCNL4035_ALS_DATA, (int *)buffer);
if (ret < 0) {
dev_err(&data->client->dev,
"Trigger consumer can't read from sensor.\n");
goto fail_read;
}
iio_push_to_buffers_with_timestamp(indio_dev, buffer,
iio_get_time_ns(indio_dev));
fail_read:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int vcnl4035_als_drdy_set_state(struct iio_trigger *trigger,
bool enable_drdy)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
struct vcnl4035_data *data = iio_priv(indio_dev);
int val = enable_drdy ? VCNL4035_MODE_ALS_INT_ENABLE :
VCNL4035_MODE_ALS_INT_DISABLE;
return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
VCNL4035_MODE_ALS_INT_MASK,
val);
}
static const struct iio_trigger_ops vcnl4035_trigger_ops = {
.validate_device = iio_trigger_validate_own_device,
.set_trigger_state = vcnl4035_als_drdy_set_state,
};
static int vcnl4035_set_pm_runtime_state(struct vcnl4035_data *data, bool on)
{
int ret;
struct device *dev = &data->client->dev;
if (on) {
ret = pm_runtime_get_sync(dev);
if (ret < 0)
pm_runtime_put_noidle(dev);
} else {
pm_runtime_mark_last_busy(dev);
ret = pm_runtime_put_autosuspend(dev);
}
return ret;
}
/*
* Device IT INT Time (ms) Scale (lux/step)
* 000 50 0.064
* 001 100 0.032
* 010 200 0.016
* 100 400 0.008
* 101 - 111 800 0.004
* Values are proportional, so ALS INT is selected for input due to
* simplicity reason. Integration time value and scaling is
* calculated based on device INT value
*
* Raw value needs to be scaled using ALS steps
*/
static int vcnl4035_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
struct vcnl4035_data *data = iio_priv(indio_dev);
int ret;
int raw_data;
unsigned int reg;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = vcnl4035_set_pm_runtime_state(data, true);
if (ret < 0)
return ret;
ret = iio_device_claim_direct_mode(indio_dev);
if (!ret) {
if (chan->channel)
reg = VCNL4035_ALS_DATA;
else
reg = VCNL4035_WHITE_DATA;
ret = regmap_read(data->regmap, reg, &raw_data);
iio_device_release_direct_mode(indio_dev);
if (!ret) {
*val = raw_data;
ret = IIO_VAL_INT;
}
}
vcnl4035_set_pm_runtime_state(data, false);
return ret;
case IIO_CHAN_INFO_INT_TIME:
*val = 50;
if (data->als_it_val)
*val = data->als_it_val * 100;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 64;
if (!data->als_it_val)
*val2 = 1000;
else
*val2 = data->als_it_val * 2 * 1000;
return IIO_VAL_FRACTIONAL;
default:
return -EINVAL;
}
}
static int vcnl4035_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
int ret;
struct vcnl4035_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
if (val <= 0 || val > 800)
return -EINVAL;
ret = vcnl4035_set_pm_runtime_state(data, true);
if (ret < 0)
return ret;
ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
VCNL4035_ALS_IT_MASK,
val / 100);
if (!ret)
data->als_it_val = val / 100;
vcnl4035_set_pm_runtime_state(data, false);
return ret;
default:
return -EINVAL;
}
}
/* No direct ABI for persistence and threshold, so eventing */
static int vcnl4035_read_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir, enum iio_event_info info,
int *val, int *val2)
{
struct vcnl4035_data *data = iio_priv(indio_dev);
switch (info) {
case IIO_EV_INFO_VALUE:
switch (dir) {
case IIO_EV_DIR_RISING:
*val = data->als_thresh_high;
return IIO_VAL_INT;
case IIO_EV_DIR_FALLING:
*val = data->als_thresh_low;
return IIO_VAL_INT;
default:
return -EINVAL;
}
break;
case IIO_EV_INFO_PERIOD:
*val = data->als_persistence;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int vcnl4035_write_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir, enum iio_event_info info, int val,
int val2)
{
struct vcnl4035_data *data = iio_priv(indio_dev);
int ret;
switch (info) {
case IIO_EV_INFO_VALUE:
/* 16 bit threshold range 0 - 65535 */
if (val < 0 || val > 65535)
return -EINVAL;
if (dir == IIO_EV_DIR_RISING) {
if (val < data->als_thresh_low)
return -EINVAL;
ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
val);
if (ret)
return ret;
data->als_thresh_high = val;
} else {
if (val > data->als_thresh_high)
return -EINVAL;
ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
val);
if (ret)
return ret;
data->als_thresh_low = val;
}
return ret;
case IIO_EV_INFO_PERIOD:
/* allow only 1 2 4 8 as persistence value */
if (val < 0 || val > 8 || hweight8(val) != 1)
return -EINVAL;
ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
VCNL4035_ALS_PERS_MASK, val);
if (!ret)
data->als_persistence = val;
return ret;
default:
return -EINVAL;
}
}
static IIO_CONST_ATTR_INT_TIME_AVAIL("50 100 200 400 800");
static struct attribute *vcnl4035_attributes[] = {
&iio_const_attr_integration_time_available.dev_attr.attr,
NULL,
};
static const struct attribute_group vcnl4035_attribute_group = {
.attrs = vcnl4035_attributes,
};
static const struct iio_info vcnl4035_info = {
.read_raw = vcnl4035_read_raw,
.write_raw = vcnl4035_write_raw,
.read_event_value = vcnl4035_read_thresh,
.write_event_value = vcnl4035_write_thresh,
.attrs = &vcnl4035_attribute_group,
};
static const struct iio_event_spec vcnl4035_event_spec[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_VALUE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_VALUE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_PERIOD),
},
};
enum vcnl4035_scan_index_order {
VCNL4035_CHAN_INDEX_LIGHT,
VCNL4035_CHAN_INDEX_WHITE_LED,
};
static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
.validate_scan_mask = &iio_validate_scan_mask_onehot,
};
static const struct iio_chan_spec vcnl4035_channels[] = {
{
.type = IIO_LIGHT,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_SCALE),
.event_spec = vcnl4035_event_spec,
.num_event_specs = ARRAY_SIZE(vcnl4035_event_spec),
.scan_index = VCNL4035_CHAN_INDEX_LIGHT,
.scan_type = {
.sign = 'u',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_LE,
},
},
{
.type = IIO_INTENSITY,
.channel = 1,
.modified = 1,
.channel2 = IIO_MOD_LIGHT_BOTH,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.scan_index = VCNL4035_CHAN_INDEX_WHITE_LED,
.scan_type = {
.sign = 'u',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_LE,
},
},
};
static int vcnl4035_set_als_power_state(struct vcnl4035_data *data, u8 status)
{
return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
VCNL4035_MODE_ALS_MASK,
status);
}
static int vcnl4035_init(struct vcnl4035_data *data)
{
int ret;
int id;
ret = regmap_read(data->regmap, VCNL4035_DEV_ID, &id);
if (ret < 0) {
dev_err(&data->client->dev, "Failed to read DEV_ID register\n");
return ret;
}
if (id != VCNL4035_DEV_ID_VAL) {
dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
id, VCNL4035_DEV_ID_VAL);
return -ENODEV;
}
ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
if (ret < 0)
return ret;
/* ALS white channel enable */
ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
VCNL4035_MODE_ALS_WHITE_CHAN,
1);
if (ret) {
dev_err(&data->client->dev, "set white channel enable %d\n",
ret);
return ret;
}
/* set default integration time - 100 ms for ALS */
ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
VCNL4035_ALS_IT_MASK,
VCNL4035_ALS_IT_DEFAULT);
if (ret) {
dev_err(&data->client->dev, "set default ALS IT returned %d\n",
ret);
return ret;
}
data->als_it_val = VCNL4035_ALS_IT_DEFAULT;
/* set default persistence time - 1 for ALS */
ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
VCNL4035_ALS_PERS_MASK,
VCNL4035_ALS_PERS_DEFAULT);
if (ret) {
dev_err(&data->client->dev, "set default PERS returned %d\n",
ret);
return ret;
}
data->als_persistence = VCNL4035_ALS_PERS_DEFAULT;
/* set default HIGH threshold for ALS */
ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
VCNL4035_ALS_THDH_DEFAULT);
if (ret) {
dev_err(&data->client->dev, "set default THDH returned %d\n",
ret);
return ret;
}
data->als_thresh_high = VCNL4035_ALS_THDH_DEFAULT;
/* set default LOW threshold for ALS */
ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
VCNL4035_ALS_THDL_DEFAULT);
if (ret) {
dev_err(&data->client->dev, "set default THDL returned %d\n",
ret);
return ret;
}
data->als_thresh_low = VCNL4035_ALS_THDL_DEFAULT;
return 0;
}
static bool vcnl4035_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case VCNL4035_ALS_CONF:
case VCNL4035_DEV_ID:
return false;
default:
return true;
}
}
static const struct regmap_config vcnl4035_regmap_config = {
.name = VCNL4035_REGMAP_NAME,
.reg_bits = 8,
.val_bits = 16,
.max_register = VCNL4035_DEV_ID,
.cache_type = REGCACHE_RBTREE,
.volatile_reg = vcnl4035_is_volatile_reg,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static int vcnl4035_probe_trigger(struct iio_dev *indio_dev)
{
int ret;
struct vcnl4035_data *data = iio_priv(indio_dev);
data->drdy_trigger0 = devm_iio_trigger_alloc(
indio_dev->dev.parent,
"%s-dev%d", indio_dev->name, indio_dev->id);
if (!data->drdy_trigger0)
return -ENOMEM;
data->drdy_trigger0->dev.parent = indio_dev->dev.parent;
data->drdy_trigger0->ops = &vcnl4035_trigger_ops;
iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
ret = devm_iio_trigger_register(indio_dev->dev.parent,
data->drdy_trigger0);
if (ret) {
dev_err(&data->client->dev, "iio trigger register failed\n");
return ret;
}
/* Trigger setup */
ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev,
NULL, vcnl4035_trigger_consumer_handler,
&iio_triggered_buffer_setup_ops);
if (ret < 0) {
dev_err(&data->client->dev, "iio triggered buffer setup failed\n");
return ret;
}
/* IRQ to trigger mapping */
ret = devm_request_threaded_irq(&data->client->dev, data->client->irq,
NULL, vcnl4035_drdy_irq_thread,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
VCNL4035_IRQ_NAME, indio_dev);
if (ret < 0)
dev_err(&data->client->dev, "request irq %d for trigger0 failed\n",
data->client->irq);
return ret;
}
static int vcnl4035_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct vcnl4035_data *data;
struct iio_dev *indio_dev;
struct regmap *regmap;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
regmap = devm_regmap_init_i2c(client, &vcnl4035_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "regmap_init failed!\n");
return PTR_ERR(regmap);
}
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
data->regmap = regmap;
indio_dev->dev.parent = &client->dev;
indio_dev->info = &vcnl4035_info;
indio_dev->name = VCNL4035_DRV_NAME;
indio_dev->channels = vcnl4035_channels;
indio_dev->num_channels = ARRAY_SIZE(vcnl4035_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = vcnl4035_init(data);
if (ret < 0) {
dev_err(&client->dev, "vcnl4035 chip init failed\n");
return ret;
}
if (client->irq > 0) {
ret = vcnl4035_probe_trigger(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "vcnl4035 unable init trigger\n");
goto fail_poweroff;
}
}
ret = pm_runtime_set_active(&client->dev);
if (ret < 0)
goto fail_poweroff;
ret = iio_device_register(indio_dev);
if (ret < 0)
goto fail_poweroff;
pm_runtime_enable(&client->dev);
pm_runtime_set_autosuspend_delay(&client->dev, VCNL4035_SLEEP_DELAY_MS);
pm_runtime_use_autosuspend(&client->dev);
return 0;
fail_poweroff:
vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
return ret;
}
static int vcnl4035_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
pm_runtime_dont_use_autosuspend(&client->dev);
pm_runtime_disable(&client->dev);
iio_device_unregister(indio_dev);
pm_runtime_set_suspended(&client->dev);
return vcnl4035_set_als_power_state(iio_priv(indio_dev),
VCNL4035_MODE_ALS_DISABLE);
}
static int __maybe_unused vcnl4035_runtime_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct vcnl4035_data *data = iio_priv(indio_dev);
int ret;
ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
regcache_mark_dirty(data->regmap);
return ret;
}
static int __maybe_unused vcnl4035_runtime_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct vcnl4035_data *data = iio_priv(indio_dev);
int ret;
regcache_sync(data->regmap);
ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
if (ret < 0)
return ret;
/* wait for 1 ALS integration cycle */
msleep(data->als_it_val * 100);
return 0;
}
static const struct dev_pm_ops vcnl4035_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(vcnl4035_runtime_suspend,
vcnl4035_runtime_resume, NULL)
};
static const struct of_device_id vcnl4035_of_match[] = {
{ .compatible = "vishay,vcnl4035", },
{ }
};
MODULE_DEVICE_TABLE(of, vcnl4035_of_match);
static struct i2c_driver vcnl4035_driver = {
.driver = {
.name = VCNL4035_DRV_NAME,
.pm = &vcnl4035_pm_ops,
.of_match_table = vcnl4035_of_match,
},
.probe = vcnl4035_probe,
.remove = vcnl4035_remove,
};
module_i2c_driver(vcnl4035_driver);
MODULE_AUTHOR("Parthiban Nallathambi <pn@denx.de>");
MODULE_DESCRIPTION("VCNL4035 Ambient Light Sensor driver");
MODULE_LICENSE("GPL v2");
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