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

From: Parthiban Nallathambi
Date: Fri Jun 29 2018 - 11:38:34 EST

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

Signed-off-by: Parthiban Nallathambi <pn@xxxxxxx>
---

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@xxxxxxx>
+ *
+ *
+ * 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
+#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);
+ 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,
+ 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)
+ * 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
+ * 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 busy;
+ 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)
+ *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;
+ 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;
+}
+
+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);
+ 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))
+ 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
+};
+
+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",
+ 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);
+}
+
+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@xxxxxxx>");
+MODULE_DESCRIPTION("VCNL4035 Ambient Light Sensor driver");
+MODULE_LICENSE("GPL v2");
--
2.14.4