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SubjectRe: [PATCH v2 1/2] iio: light: Add support for vishay vcnl4035

> Add support for VCNL4035, which is capable of Ambient light
> sensing (ALS) and proximity function. This patch adds support
> only for ALS function

comments below

a lot of effort is in getting a timestamp; is it worth it for ALS
measurement? also the implementation is quite involved, what is the idea?

> Signed-off-by: Parthiban Nallathambi <pn@denx.de>
> ---
>
> Changelog since v1:
>
> 1. Fixed 0-day warning on le16_to_cpu usage
> 2. Persistence value is directly mapped to datasheet's value to
> avoid confusions of usage from sysfs
> ---
> drivers/iio/light/Kconfig | 12 +
> drivers/iio/light/Makefile | 1 +
> drivers/iio/light/vcnl4035.c | 682 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 695 insertions(+)
> create mode 100644 drivers/iio/light/vcnl4035.c
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index c7ef8d1862d6..b7069a4c28a2 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -447,6 +447,18 @@ config VCNL4000
> To compile this driver as a module, choose M here: the
> module will be called vcnl4000.
>
> +config VCNL4035
> + tristate "VCNL4035 combined ALS and proximity sensor"
> + select REGMAP_I2C
> + depends on I2C
> + help
> + Say Y here if you want to build a driver for the Vishay VCNL4035,
> + combined ambient light (ALS) and proximity sensor. Currently only ALS
> + function is available.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called vcnl4035.
> +
> config VEML6070
> tristate "VEML6070 UV A light sensor"
> depends on I2C
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index 80943af5d627..dce98511a59b 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -44,6 +44,7 @@ obj-$(CONFIG_TSL2772) += tsl2772.o
> obj-$(CONFIG_TSL4531) += tsl4531.o
> obj-$(CONFIG_US5182D) += us5182d.o
> obj-$(CONFIG_VCNL4000) += vcnl4000.o
> +obj-$(CONFIG_VCNL4035) += vcnl4035.o
> obj-$(CONFIG_VEML6070) += veml6070.o
> obj-$(CONFIG_VL6180) += vl6180.o
> obj-$(CONFIG_ZOPT2201) += zopt2201.o
> diff --git a/drivers/iio/light/vcnl4035.c b/drivers/iio/light/vcnl4035.c
> new file mode 100644
> index 000000000000..45eccb462ed0
> --- /dev/null
> +++ b/drivers/iio/light/vcnl4035.c
> @@ -0,0 +1,682 @@
> +// 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/module.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/pm_runtime.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/iio/buffer.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_INT_FLAG 0x0D

there seems to be a tab before VCNL4035_INT_FLAG, should be space

> +#define VCNL4035_DEV_ID 0x0E
> +
> +/* Register masks */
> +#define VCNL4035_MODE_ALS_MASK BIT(0)
> +#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 0x00
> +#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;
> + /* protect device settings persistence, integration time, threshold */
> + struct mutex lock;
> + unsigned int als_it_val;
> + unsigned int als_persistence:4;
> + unsigned int als_thresh_low;
> + unsigned int als_thresh_high;
> + struct iio_trigger *drdy_trigger0;
> + s64 irq_timestamp;
> +};
> +
> +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;
> + if (reg & (VCNL4035_INT_ALS_IF_H_MASK | VCNL4035_INT_ALS_IF_L_MASK))
> + return true;
> + else
> + return false;
> +}
> +
> +static irqreturn_t vcnl4035_drdy_irq_handler(int irq, void *private)
> +{
> + struct iio_dev *indio_dev = private;
> + struct vcnl4035_data *data = iio_priv(indio_dev);
> +
> + data->irq_timestamp = iio_get_time_ns(indio_dev);
> + return IRQ_WAKE_THREAD;
> +}
> +
> +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_trigger_poll_chained(data->drdy_trigger0);
> + return IRQ_HANDLED;
> + }
> +
> + return IRQ_NONE;
> +}
> +
> +/* Triggered buffer */
> +static irqreturn_t vcnl4035_trigger_consumer_store_time(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *indio_dev = pf->indio_dev;
> +
> + if (!iio_trigger_using_own(indio_dev))
> + pf->timestamp = iio_get_time_ns(indio_dev);
> +
> + return IRQ_WAKE_THREAD;
> +}
> +
> +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);
> + int als_data;
> + int ret;
> +
> + if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) {
> + pf->timestamp = data->irq_timestamp;
> + data->irq_timestamp = 0;
> + }
> +
> + if (!pf->timestamp)
> + pf->timestamp = iio_get_time_ns(indio_dev);
> +
> + mutex_lock(&data->lock);

what is the purpose of the lock?
the comment in vcnl4035_data doesn't mention it either

> + ret = regmap_read(data->regmap, VCNL4035_ALS_DATA, &als_data);
> + mutex_unlock(&data->lock);
> + if (!ret)
> + iio_push_to_buffers_with_timestamp(indio_dev,
> + &als_data,

als_data needs to be large enough to hold the timestamp, see documentation
of iio_push_to_buffers_with_timestamp()

> + pf->timestamp);
> + else
> + dev_err(&data->client->dev,
> + "Trigger consumer can't read from sensor.\n");
> + pf->timestamp = 0;
> +
> + 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;
> + int ret;
> +
> + ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
> + VCNL4035_MODE_ALS_INT_MASK,
> + val);
> + if (ret)
> + dev_err(&data->client->dev, "%s failed\n", __func__);
> +
> + return ret;
> +}
> +
> +static const struct iio_trigger_ops vcnl4035_trigger_ops = {
> + .set_trigger_state = vcnl4035_als_drdy_set_state,
> +};
> +
> +/*
> + * Device IT INT Time(ms) Scale (lux/step)

maybe space before (ms)?

> + * 000 50 0.064
> + * 001 100 0.032
> + * 010 200 0.016
> + * 100 400 0.008
> + * 101 - 111 800 0.004
> + * Values are proportial, so ALS INT is selected for input due to

proportional

> + * simplicity reason. Integration time value and scaling is
> + * calculated based on device INT value
> + *
> + * Raw value needs to be scaled using ALS STEPS

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 busy;

needed? can 'ret' be used?

> + int raw_data;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + busy = iio_device_claim_direct_mode(indio_dev);
> + if (busy)
> + return -EBUSY;
> +
> + ret = regmap_read(data->regmap, VCNL4035_ALS_DATA, &raw_data);
> + iio_device_release_direct_mode(indio_dev);
> + if (ret < 0)
> + return ret;
> +
> + *val = raw_data;
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_INT_TIME:
> + mutex_lock(&data->lock);
> + *val = data->als_it_val * 100;
> + if (!*val)

maybe check data->als_it_val and then set *val accordingly as done below

> + *val = 50;
> + mutex_unlock(&data->lock);
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_SCALE:
> + mutex_lock(&data->lock);
> + *val = 64;
> + if (!data->als_it_val)
> + *val2 = 1000;
> + else
> + *val2 = data->als_it_val * 2 * 1000;
> + mutex_unlock(&data->lock);
> + 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;
> + mutex_lock(&data->lock);
> + ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
> + VCNL4035_ALS_IT_MASK,
> + val / 100);
> + if (!ret)
> + data->als_it_val = val / 100;
> + mutex_unlock(&data->lock);
> + break;

return ret;
directly here

> + default:
> + return -EINVAL;
> + }
> + return ret;
> +}
> +
> +/* 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:
> + mutex_lock(&data->lock);
> + *val = data->als_thresh_high;
> + mutex_unlock(&data->lock);
> + break;
> + case IIO_EV_DIR_FALLING:
> + mutex_lock(&data->lock);
> + *val = data->als_thresh_low;
> + mutex_unlock(&data->lock);
> + break;
> + default:
> + return -EINVAL;
> + }
> + break;
> + case IIO_EV_INFO_PERIOD:
> + mutex_lock(&data->lock);
> + *val = data->als_persistence;
> + mutex_unlock(&data->lock);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return IIO_VAL_INT;

move it up, instead of the
break;

> +}
> +
> +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 */
> + if (val < 0 || val > 65535)
> + return -EINVAL;
> + if (dir == IIO_EV_DIR_RISING) {
> + if (val < data->als_thresh_low)
> + return -EINVAL;
> + mutex_lock(&data->lock);
> + ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
> + val);

isn't the purpose of the lock to have
data->als_thresh_high = val;
in the same critical section?

here and similarly below

> + mutex_unlock(&data->lock);
> + if (ret)
> + return ret;
> + data->als_thresh_high = val;
> + } else {
> + if (val > data->als_thresh_high)
> + return -EINVAL;
> + mutex_lock(&data->lock);
> + ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
> + val);
> + mutex_unlock(&data->lock);
> + if (ret)
> + return ret;
> + data->als_thresh_low = val;
> + }
> + break;
> + case IIO_EV_INFO_PERIOD:
> + /* allow only 1 2 4 8 as persistence value */
> + if (val < 0 || val > 8 || (__sw_hweight8(val) != 1))

parenthesis around last condition not needed

> + return -EINVAL;
> + mutex_lock(&data->lock);
> + ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
> + VCNL4035_ALS_PERS_MASK, val);
> + mutex_unlock(&data->lock);
> + if (ret)
> + return ret;
> + data->als_persistence = val;
> + break;
> + default:
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +static IIO_CONST_ATTR(als_available_integration_time, "50 100 200 400 800");
> +static IIO_CONST_ATTR(als_available_persistence, "1 2 4 8");
> +static IIO_CONST_ATTR(als_available_threshold_range, "0 65535");
> +
> +static struct attribute *vcnl4035_attributes[] = {
> + &iio_const_attr_als_available_integration_time.dev_attr.attr,
> + &iio_const_attr_als_available_threshold_range.dev_attr.attr,
> + &iio_const_attr_als_available_persistence.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,
> +};
> +
> +enum vcnl4035_scan_index_order {
> + VCNL4035_CHAN_INDEX_LIGHT,
> +};
> +
> +static const unsigned long vcnl4035_available_scan_masks[] = {
> + BIT(VCNL4035_CHAN_INDEX_LIGHT), 0

I'd put 0 in a separate line so that it can be extended with a single line
patch (extreme nitpick)

> +};
> +
> +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),
> + },
> +};
> +
> +static const struct iio_chan_spec vcnl4035_channels[] = {
> + {
> + .type = IIO_INTENSITY,
> + .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,
> + },
> + },
> +};
> +
> +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;
> + }
> +
> +#ifndef CONFIG_PM
> + ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
> + if (ret < 0)
> + return ret;
> +#endif
> + /* 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) {
> + pr_err("regmap_update_bits 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) {
> + pr_err("regmap_update_bits 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) {
> + pr_err("regmap_write 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) {
> + pr_err("regmap_write 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(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;
> + mutex_init(&data->lock);
> +
> + 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;
> + }
> +
> + ret = pm_runtime_set_active(&client->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);
> +
> + if (client->irq) {
> + data->drdy_trigger0 = devm_iio_trigger_alloc(
> + indio_dev->dev.parent,
> + "%s-dev%d", indio_dev->name, indio_dev->id);
> + if (!data->drdy_trigger0) {
> + ret = -ENOMEM;
> + goto fail_pm_disable;
> + }
> + data->drdy_trigger0->dev.parent = indio_dev->dev.parent;
> + data->drdy_trigger0->ops = &vcnl4035_trigger_ops;
> + indio_dev->available_scan_masks = vcnl4035_available_scan_masks;
> + iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
> +
> + /* IRQ to trigger mapping */
> + ret = devm_request_threaded_irq(&client->dev, client->irq,
> + vcnl4035_drdy_irq_handler, vcnl4035_drdy_irq_thread,
> + IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> + VCNL4035_IRQ_NAME, indio_dev);
> + if (ret < 0) {
> + dev_err(&client->dev, "request irq %d for trigger0 failed\n",
> + client->irq);
> + goto fail_pm_disable;
> + }
> +
> + ret = devm_iio_trigger_register(indio_dev->dev.parent,
> + data->drdy_trigger0);
> + if (ret) {
> + dev_err(&client->dev, "iio trigger register failed\n");
> + goto fail_pm_disable;
> + }
> +
> + /* Trigger setup */
> + ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent,
> + indio_dev,
> + vcnl4035_trigger_consumer_store_time,
> + vcnl4035_trigger_consumer_handler,
> + NULL);
> + if (ret < 0) {
> + dev_err(&client->dev, "iio triggered buffer setup failed\n");
> + goto fail_pm_disable;
> + }
> + }
> +
> + ret = iio_device_register(indio_dev);
> + if (ret)
> + goto fail_pm_disable;
> + dev_info(&client->dev, "%s Ambient light/proximity sensor\n",

no need for this logging

> + VCNL4035_DRV_NAME);
> + return 0;
> +
> +fail_pm_disable:
> + pm_runtime_disable(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> + pm_runtime_put_noidle(&client->dev);
> +fail_poweroff:
> + return vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);

I think we want to return the 'ret' value indicating the original failure,
not the return value of vcnl4035_set_als_power_state() which is likely success

> +}
> +
> +static int vcnl4035_remove(struct i2c_client *client)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> +
> + iio_device_unregister(indio_dev);
> +
> + pm_runtime_disable(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> + pm_runtime_put_noidle(&client->dev);
> +
> + return vcnl4035_set_als_power_state(iio_priv(indio_dev),
> + VCNL4035_MODE_ALS_DISABLE);
> +}
> +
> +#ifdef CONFIG_PM
> +static int 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;
> +
> + mutex_lock(&data->lock);
> + ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
> + regcache_mark_dirty(data->regmap);
> + mutex_unlock(&data->lock);
> +
> + return ret;
> +}
> +
> +static int 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;
> +}
> +#endif
> +
> +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 const struct i2c_device_id vcnl4035_id[] = {
> + { "vcnl4035", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, vcnl4035_id);
> +
> +static struct i2c_driver vcnl4035_driver = {
> + .driver = {
> + .name = VCNL4035_DRV_NAME,
> + .pm = &vcnl4035_pm_ops,
> + .of_match_table = of_match_ptr(vcnl4035_of_match),
> + },
> + .probe = vcnl4035_probe,
> + .remove = vcnl4035_remove,
> + .id_table = vcnl4035_id,
> +};
> +
> +module_i2c_driver(vcnl4035_driver);
> +
> +MODULE_AUTHOR("Parthiban Nallathambi <pn@denx.de>");
> +MODULE_DESCRIPTION("VCNL4035 Ambient Light Sensor driver");
> +MODULE_LICENSE("GPL v2");
>

--

Peter Meerwald-Stadler
Mobile: +43 664 24 44 418

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