drivers/iio/light/iqs621-als.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Azoteq IQS621/622 Ambient Light Sensors
  *
  * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
  */

 #include <linux/device.h>
 #include <linux/iio/events.h>
 #include <linux/iio/iio.h>
 #include <linux/kernel.h>
 #include <linux/mfd/iqs62x.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/notifier.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>

 #define IQS621_ALS_FLAGS_LIGHT			BIT(7)
 #define IQS621_ALS_FLAGS_RANGE			GENMASK(3, 0)

 #define IQS621_ALS_UI_OUT			0x17

 #define IQS621_ALS_THRESH_DARK			0x80
 #define IQS621_ALS_THRESH_LIGHT			0x81

 #define IQS622_IR_RANGE				0x15
 #define IQS622_IR_FLAGS				0x16
 #define IQS622_IR_FLAGS_TOUCH			BIT(1)
 #define IQS622_IR_FLAGS_PROX			BIT(0)

 #define IQS622_IR_UI_OUT			0x17

 #define IQS622_IR_THRESH_PROX			0x91
 #define IQS622_IR_THRESH_TOUCH			0x92

 struct iqs621_als_private {
 	struct iqs62x_core *iqs62x;
 	struct iio_dev *indio_dev;
 	struct notifier_block notifier;
 	struct mutex lock;
 	bool light_en;
 	bool range_en;
 	bool prox_en;
 	u8 als_flags;
 	u8 ir_flags_mask;
 	u8 ir_flags;
 	u8 thresh_light;
 	u8 thresh_dark;
 	u8 thresh_prox;
 };

 static int iqs621_als_init(struct iqs621_als_private *iqs621_als)
 {
 	struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
 	unsigned int event_mask = 0;
 	int ret;

 	switch (iqs621_als->ir_flags_mask) {
 	case IQS622_IR_FLAGS_TOUCH:
 		ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
 				   iqs621_als->thresh_prox);
 		break;

 	case IQS622_IR_FLAGS_PROX:
 		ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_PROX,
 				   iqs621_als->thresh_prox);
 		break;

 	default:
 		ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
 				   iqs621_als->thresh_light);
 		if (ret)
 			return ret;

 		ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
 				   iqs621_als->thresh_dark);
 	}

 	if (ret)
 		return ret;

 	if (iqs621_als->light_en || iqs621_als->range_en)
 		event_mask |= iqs62x->dev_desc->als_mask;

 	if (iqs621_als->prox_en)
 		event_mask |= iqs62x->dev_desc->ir_mask;

 	return regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
 				  event_mask, 0);
 }

 static int iqs621_als_notifier(struct notifier_block *notifier,
 			       unsigned long event_flags, void *context)
 {
 	struct iqs62x_event_data *event_data = context;
 	struct iqs621_als_private *iqs621_als;
 	struct iio_dev *indio_dev;
 	bool light_new, light_old;
 	bool prox_new, prox_old;
 	u8 range_new, range_old;
 	s64 timestamp;
 	int ret;

 	iqs621_als = container_of(notifier, struct iqs621_als_private,
 				  notifier);
 	indio_dev = iqs621_als->indio_dev;
 	timestamp = iio_get_time_ns(indio_dev);

 	mutex_lock(&iqs621_als->lock);

 	if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
 		ret = iqs621_als_init(iqs621_als);
 		if (ret) {
 			dev_err(indio_dev->dev.parent,
 				"Failed to re-initialize device: %d\n", ret);
 			ret = NOTIFY_BAD;
 		} else {
 			ret = NOTIFY_OK;
 		}

 		goto err_mutex;
 	}

 	if (!iqs621_als->light_en && !iqs621_als->range_en &&
 	    !iqs621_als->prox_en) {
 		ret = NOTIFY_DONE;
 		goto err_mutex;
 	}

 	/* IQS621 only */
 	light_new = event_data->als_flags & IQS621_ALS_FLAGS_LIGHT;
 	light_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_LIGHT;

 	if (iqs621_als->light_en && light_new && !light_old)
 		iio_push_event(indio_dev,
 			       IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
 						    IIO_EV_TYPE_THRESH,
 						    IIO_EV_DIR_RISING),
 			       timestamp);
 	else if (iqs621_als->light_en && !light_new && light_old)
 		iio_push_event(indio_dev,
 			       IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
 						    IIO_EV_TYPE_THRESH,
 						    IIO_EV_DIR_FALLING),
 			       timestamp);

 	/* IQS621 and IQS622 */
 	range_new = event_data->als_flags & IQS621_ALS_FLAGS_RANGE;
 	range_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_RANGE;

 	if (iqs621_als->range_en && (range_new > range_old))
 		iio_push_event(indio_dev,
 			       IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
 						    IIO_EV_TYPE_CHANGE,
 						    IIO_EV_DIR_RISING),
 			       timestamp);
 	else if (iqs621_als->range_en && (range_new < range_old))
 		iio_push_event(indio_dev,
 			       IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
 						    IIO_EV_TYPE_CHANGE,
 						    IIO_EV_DIR_FALLING),
 			       timestamp);

 	/* IQS622 only */
 	prox_new = event_data->ir_flags & iqs621_als->ir_flags_mask;
 	prox_old = iqs621_als->ir_flags & iqs621_als->ir_flags_mask;

 	if (iqs621_als->prox_en && prox_new && !prox_old)
 		iio_push_event(indio_dev,
 			       IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
 						    IIO_EV_TYPE_THRESH,
 						    IIO_EV_DIR_RISING),
 			       timestamp);
 	else if (iqs621_als->prox_en && !prox_new && prox_old)
 		iio_push_event(indio_dev,
 			       IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
 						    IIO_EV_TYPE_THRESH,
 						    IIO_EV_DIR_FALLING),
 			       timestamp);

 	iqs621_als->als_flags = event_data->als_flags;
 	iqs621_als->ir_flags = event_data->ir_flags;
 	ret = NOTIFY_OK;

 err_mutex:
 	mutex_unlock(&iqs621_als->lock);

 	return ret;
 }

 static void iqs621_als_notifier_unregister(void *context)
 {
 	struct iqs621_als_private *iqs621_als = context;
 	struct iio_dev *indio_dev = iqs621_als->indio_dev;
 	int ret;

 	ret = blocking_notifier_chain_unregister(&iqs621_als->iqs62x->nh,
 						 &iqs621_als->notifier);
 	if (ret)
 		dev_err(indio_dev->dev.parent,
 			"Failed to unregister notifier: %d\n", ret);
 }

 static int iqs621_als_read_raw(struct iio_dev *indio_dev,
 			       struct iio_chan_spec const *chan,
 			       int *val, int *val2, long mask)
 {
 	struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
 	struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
 	int ret;
 	__le16 val_buf;

 	switch (chan->type) {
 	case IIO_INTENSITY:
 		ret = regmap_read(iqs62x->regmap, chan->address, val);
 		if (ret)
 			return ret;

 		*val &= IQS621_ALS_FLAGS_RANGE;
 		return IIO_VAL_INT;

 	case IIO_PROXIMITY:
 	case IIO_LIGHT:
 		ret = regmap_raw_read(iqs62x->regmap, chan->address, &val_buf,
 				      sizeof(val_buf));
 		if (ret)
 			return ret;

 		*val = le16_to_cpu(val_buf);
 		return IIO_VAL_INT;

 	default:
 		return -EINVAL;
 	}
 }

 static int iqs621_als_read_event_config(struct iio_dev *indio_dev,
 					const struct iio_chan_spec *chan,
 					enum iio_event_type type,
 					enum iio_event_direction dir)
 {
 	struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
 	int ret;

 	mutex_lock(&iqs621_als->lock);

 	switch (chan->type) {
 	case IIO_LIGHT:
 		ret = iqs621_als->light_en;
 		break;

 	case IIO_INTENSITY:
 		ret = iqs621_als->range_en;
 		break;

 	case IIO_PROXIMITY:
 		ret = iqs621_als->prox_en;
 		break;

 	default:
 		ret = -EINVAL;
 	}

 	mutex_unlock(&iqs621_als->lock);

 	return ret;
 }

 static int iqs621_als_write_event_config(struct iio_dev *indio_dev,
 					 const struct iio_chan_spec *chan,
 					 enum iio_event_type type,
 					 enum iio_event_direction dir,
 					 int state)
 {
 	struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
 	struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
 	unsigned int val;
 	int ret;

 	mutex_lock(&iqs621_als->lock);

 	ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->als_flags, &val);
 	if (ret)
 		goto err_mutex;
 	iqs621_als->als_flags = val;

 	switch (chan->type) {
 	case IIO_LIGHT:
 		ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
 					 iqs62x->dev_desc->als_mask,
 					 iqs621_als->range_en || state ? 0 :
 									 0xFF);
 		if (!ret)
 			iqs621_als->light_en = state;
 		break;

 	case IIO_INTENSITY:
 		ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
 					 iqs62x->dev_desc->als_mask,
 					 iqs621_als->light_en || state ? 0 :
 									 0xFF);
 		if (!ret)
 			iqs621_als->range_en = state;
 		break;

 	case IIO_PROXIMITY:
 		ret = regmap_read(iqs62x->regmap, IQS622_IR_FLAGS, &val);
 		if (ret)
 			goto err_mutex;
 		iqs621_als->ir_flags = val;

 		ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
 					 iqs62x->dev_desc->ir_mask,
 					 state ? 0 : 0xFF);
 		if (!ret)
 			iqs621_als->prox_en = state;
 		break;

 	default:
 		ret = -EINVAL;
 	}

 err_mutex:
 	mutex_unlock(&iqs621_als->lock);

 	return ret;
 }

 static int iqs621_als_read_event_value(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 iqs621_als_private *iqs621_als = iio_priv(indio_dev);
 	int ret = IIO_VAL_INT;

 	mutex_lock(&iqs621_als->lock);

 	switch (dir) {
 	case IIO_EV_DIR_RISING:
 		*val = iqs621_als->thresh_light * 16;
 		break;

 	case IIO_EV_DIR_FALLING:
 		*val = iqs621_als->thresh_dark * 4;
 		break;

 	case IIO_EV_DIR_EITHER:
 		if (iqs621_als->ir_flags_mask == IQS622_IR_FLAGS_TOUCH)
 			*val = iqs621_als->thresh_prox * 4;
 		else
 			*val = iqs621_als->thresh_prox;
 		break;

 	default:
 		ret = -EINVAL;
 	}

 	mutex_unlock(&iqs621_als->lock);

 	return ret;
 }

 static int iqs621_als_write_event_value(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 iqs621_als_private *iqs621_als = iio_priv(indio_dev);
 	struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
 	unsigned int thresh_reg, thresh_val;
 	u8 ir_flags_mask, *thresh_cache;
 	int ret = -EINVAL;

 	mutex_lock(&iqs621_als->lock);

 	switch (dir) {
 	case IIO_EV_DIR_RISING:
 		thresh_reg = IQS621_ALS_THRESH_LIGHT;
 		thresh_val = val / 16;

 		thresh_cache = &iqs621_als->thresh_light;
 		ir_flags_mask = 0;
 		break;

 	case IIO_EV_DIR_FALLING:
 		thresh_reg = IQS621_ALS_THRESH_DARK;
 		thresh_val = val / 4;

 		thresh_cache = &iqs621_als->thresh_dark;
 		ir_flags_mask = 0;
 		break;

 	case IIO_EV_DIR_EITHER:
 		/*
 		 * The IQS622 supports two detection thresholds, both measured
 		 * in the same arbitrary units reported by read_raw: proximity
 		 * (0 through 255 in steps of 1), and touch (0 through 1020 in
 		 * steps of 4).
 		 *
 		 * Based on the single detection threshold chosen by the user,
 		 * select the hardware threshold that gives the best trade-off
 		 * between range and resolution.
 		 *
 		 * By default, the close-range (but coarse) touch threshold is
 		 * chosen during probe.
 		 */
 		switch (val) {
 		case 0 ... 255:
 			thresh_reg = IQS622_IR_THRESH_PROX;
 			thresh_val = val;

 			ir_flags_mask = IQS622_IR_FLAGS_PROX;
 			break;

 		case 256 ... 1020:
 			thresh_reg = IQS622_IR_THRESH_TOUCH;
 			thresh_val = val / 4;

 			ir_flags_mask = IQS622_IR_FLAGS_TOUCH;
 			break;

 		default:
 			goto err_mutex;
 		}

 		thresh_cache = &iqs621_als->thresh_prox;
 		break;

 	default:
 		goto err_mutex;
 	}

 	if (thresh_val > 0xFF)
 		goto err_mutex;

 	ret = regmap_write(iqs62x->regmap, thresh_reg, thresh_val);
 	if (ret)
 		goto err_mutex;

 	*thresh_cache = thresh_val;
 	iqs621_als->ir_flags_mask = ir_flags_mask;

 err_mutex:
 	mutex_unlock(&iqs621_als->lock);

 	return ret;
 }

 static const struct iio_info iqs621_als_info = {
 	.read_raw = &iqs621_als_read_raw,
 	.read_event_config = iqs621_als_read_event_config,
 	.write_event_config = iqs621_als_write_event_config,
 	.read_event_value = iqs621_als_read_event_value,
 	.write_event_value = iqs621_als_write_event_value,
 };

 static const struct iio_event_spec iqs621_als_range_events[] = {
 	{
 		.type = IIO_EV_TYPE_CHANGE,
 		.dir = IIO_EV_DIR_EITHER,
 		.mask_separate = BIT(IIO_EV_INFO_ENABLE),
 	},
 };

 static const struct iio_event_spec iqs621_als_light_events[] = {
 	{
 		.type = IIO_EV_TYPE_THRESH,
 		.dir = IIO_EV_DIR_EITHER,
 		.mask_separate = BIT(IIO_EV_INFO_ENABLE),
 	},
 	{
 		.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),
 	},
 };

 static const struct iio_chan_spec iqs621_als_channels[] = {
 	{
 		.type = IIO_INTENSITY,
 		.address = IQS621_ALS_FLAGS,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 		.event_spec = iqs621_als_range_events,
 		.num_event_specs = ARRAY_SIZE(iqs621_als_range_events),
 	},
 	{
 		.type = IIO_LIGHT,
 		.address = IQS621_ALS_UI_OUT,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
 		.event_spec = iqs621_als_light_events,
 		.num_event_specs = ARRAY_SIZE(iqs621_als_light_events),
 	},
 };

 static const struct iio_event_spec iqs622_als_prox_events[] = {
 	{
 		.type = IIO_EV_TYPE_THRESH,
 		.dir = IIO_EV_DIR_EITHER,
 		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
 				 BIT(IIO_EV_INFO_VALUE),
 	},
 };

 static const struct iio_chan_spec iqs622_als_channels[] = {
 	{
 		.type = IIO_INTENSITY,
 		.channel2 = IIO_MOD_LIGHT_BOTH,
 		.address = IQS622_ALS_FLAGS,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 		.event_spec = iqs621_als_range_events,
 		.num_event_specs = ARRAY_SIZE(iqs621_als_range_events),
 		.modified = true,
 	},
 	{
 		.type = IIO_INTENSITY,
 		.channel2 = IIO_MOD_LIGHT_IR,
 		.address = IQS622_IR_RANGE,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 		.modified = true,
 	},
 	{
 		.type = IIO_PROXIMITY,
 		.address = IQS622_IR_UI_OUT,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 		.event_spec = iqs622_als_prox_events,
 		.num_event_specs = ARRAY_SIZE(iqs622_als_prox_events),
 	},
 };

 static int iqs621_als_probe(struct platform_device *pdev)
 {
 	struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
 	struct iqs621_als_private *iqs621_als;
 	struct iio_dev *indio_dev;
 	unsigned int val;
 	int ret;

 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*iqs621_als));
 	if (!indio_dev)
 		return -ENOMEM;

 	iqs621_als = iio_priv(indio_dev);
 	iqs621_als->iqs62x = iqs62x;
 	iqs621_als->indio_dev = indio_dev;

 	if (iqs62x->dev_desc->prod_num == IQS622_PROD_NUM) {
 		ret = regmap_read(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
 				  &val);
 		if (ret)
 			return ret;
 		iqs621_als->thresh_prox = val;
 		iqs621_als->ir_flags_mask = IQS622_IR_FLAGS_TOUCH;

 		indio_dev->channels = iqs622_als_channels;
 		indio_dev->num_channels = ARRAY_SIZE(iqs622_als_channels);
 	} else {
 		ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
 				  &val);
 		if (ret)
 			return ret;
 		iqs621_als->thresh_light = val;

 		ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
 				  &val);
 		if (ret)
 			return ret;
 		iqs621_als->thresh_dark = val;

 		indio_dev->channels = iqs621_als_channels;
 		indio_dev->num_channels = ARRAY_SIZE(iqs621_als_channels);
 	}

 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->name = iqs62x->dev_desc->dev_name;
 	indio_dev->info = &iqs621_als_info;

 	mutex_init(&iqs621_als->lock);

 	iqs621_als->notifier.notifier_call = iqs621_als_notifier;
 	ret = blocking_notifier_chain_register(&iqs621_als->iqs62x->nh,
 					       &iqs621_als->notifier);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret);
 		return ret;
 	}

 	ret = devm_add_action_or_reset(&pdev->dev,
 				       iqs621_als_notifier_unregister,
 				       iqs621_als);
 	if (ret)
 		return ret;

 	return devm_iio_device_register(&pdev->dev, indio_dev);
 }

 static struct platform_driver iqs621_als_platform_driver = {
 	.driver = {
 		.name = "iqs621-als",
 	},
 	.probe = iqs621_als_probe,
 };
 module_platform_driver(iqs621_als_platform_driver);

 MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
 MODULE_DESCRIPTION("Azoteq IQS621/622 Ambient Light Sensors");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:iqs621-als");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Azoteq IQS621/622 Ambient Light Sensors
	*
	* Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
	*/

	#include <linux/device.h>
	#include <linux/iio/events.h>
	#include <linux/iio/iio.h>
	#include <linux/kernel.h>
	#include <linux/mfd/iqs62x.h>
	#include <linux/module.h>
	#include <linux/mutex.h>
	#include <linux/notifier.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>

	#define IQS621_ALS_FLAGS_LIGHT BIT(7)
	#define IQS621_ALS_FLAGS_RANGE GENMASK(3, 0)

	#define IQS621_ALS_UI_OUT 0x17

	#define IQS621_ALS_THRESH_DARK 0x80
	#define IQS621_ALS_THRESH_LIGHT 0x81

	#define IQS622_IR_RANGE 0x15
	#define IQS622_IR_FLAGS 0x16
	#define IQS622_IR_FLAGS_TOUCH BIT(1)
	#define IQS622_IR_FLAGS_PROX BIT(0)

	#define IQS622_IR_UI_OUT 0x17

	#define IQS622_IR_THRESH_PROX 0x91
	#define IQS622_IR_THRESH_TOUCH 0x92

	struct iqs621_als_private {
	struct iqs62x_core *iqs62x;
	struct iio_dev *indio_dev;
	struct notifier_block notifier;
	struct mutex lock;
	bool light_en;
	bool range_en;
	bool prox_en;
	u8 als_flags;
	u8 ir_flags_mask;
	u8 ir_flags;
	u8 thresh_light;
	u8 thresh_dark;
	u8 thresh_prox;
	};

	static int iqs621_als_init(struct iqs621_als_private *iqs621_als)
	{
	struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
	unsigned int event_mask = 0;
	int ret;

	switch (iqs621_als->ir_flags_mask) {
	case IQS622_IR_FLAGS_TOUCH:
	ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
	iqs621_als->thresh_prox);
	break;

	case IQS622_IR_FLAGS_PROX:
	ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_PROX,
	iqs621_als->thresh_prox);
	break;

	default:
	ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
	iqs621_als->thresh_light);
	if (ret)
	return ret;

	ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
	iqs621_als->thresh_dark);
	}

	if (ret)
	return ret;

	if (iqs621_als->light_en \|\| iqs621_als->range_en)
	event_mask \|= iqs62x->dev_desc->als_mask;

	if (iqs621_als->prox_en)
	event_mask \|= iqs62x->dev_desc->ir_mask;

	return regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
	event_mask, 0);
	}

	static int iqs621_als_notifier(struct notifier_block *notifier,
	unsigned long event_flags, void *context)
	{
	struct iqs62x_event_data *event_data = context;
	struct iqs621_als_private *iqs621_als;
	struct iio_dev *indio_dev;
	bool light_new, light_old;
	bool prox_new, prox_old;
	u8 range_new, range_old;
	s64 timestamp;
	int ret;

	iqs621_als = container_of(notifier, struct iqs621_als_private,
	notifier);
	indio_dev = iqs621_als->indio_dev;
	timestamp = iio_get_time_ns(indio_dev);

	mutex_lock(&iqs621_als->lock);

	if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
	ret = iqs621_als_init(iqs621_als);
	if (ret) {
	dev_err(indio_dev->dev.parent,
	"Failed to re-initialize device: %d\n", ret);
	ret = NOTIFY_BAD;
	} else {
	ret = NOTIFY_OK;
	}

	goto err_mutex;
	}

	if (!iqs621_als->light_en && !iqs621_als->range_en &&
	!iqs621_als->prox_en) {
	ret = NOTIFY_DONE;
	goto err_mutex;
	}

	/* IQS621 only */
	light_new = event_data->als_flags & IQS621_ALS_FLAGS_LIGHT;
	light_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_LIGHT;

	if (iqs621_als->light_en && light_new && !light_old)
	iio_push_event(indio_dev,
	IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
	IIO_EV_TYPE_THRESH,
	IIO_EV_DIR_RISING),
	timestamp);
	else if (iqs621_als->light_en && !light_new && light_old)
	iio_push_event(indio_dev,
	IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
	IIO_EV_TYPE_THRESH,
	IIO_EV_DIR_FALLING),
	timestamp);

	/* IQS621 and IQS622 */
	range_new = event_data->als_flags & IQS621_ALS_FLAGS_RANGE;
	range_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_RANGE;

	if (iqs621_als->range_en && (range_new > range_old))
	iio_push_event(indio_dev,
	IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
	IIO_EV_TYPE_CHANGE,
	IIO_EV_DIR_RISING),
	timestamp);
	else if (iqs621_als->range_en && (range_new < range_old))
	iio_push_event(indio_dev,
	IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
	IIO_EV_TYPE_CHANGE,
	IIO_EV_DIR_FALLING),
	timestamp);

	/* IQS622 only */
	prox_new = event_data->ir_flags & iqs621_als->ir_flags_mask;
	prox_old = iqs621_als->ir_flags & iqs621_als->ir_flags_mask;

	if (iqs621_als->prox_en && prox_new && !prox_old)
	iio_push_event(indio_dev,
	IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
	IIO_EV_TYPE_THRESH,
	IIO_EV_DIR_RISING),
	timestamp);
	else if (iqs621_als->prox_en && !prox_new && prox_old)
	iio_push_event(indio_dev,
	IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
	IIO_EV_TYPE_THRESH,
	IIO_EV_DIR_FALLING),
	timestamp);

	iqs621_als->als_flags = event_data->als_flags;
	iqs621_als->ir_flags = event_data->ir_flags;
	ret = NOTIFY_OK;

	err_mutex:
	mutex_unlock(&iqs621_als->lock);

	return ret;
	}

	static void iqs621_als_notifier_unregister(void *context)
	{
	struct iqs621_als_private *iqs621_als = context;
	struct iio_dev *indio_dev = iqs621_als->indio_dev;
	int ret;

	ret = blocking_notifier_chain_unregister(&iqs621_als->iqs62x->nh,
	&iqs621_als->notifier);
	if (ret)
	dev_err(indio_dev->dev.parent,
	"Failed to unregister notifier: %d\n", ret);
	}

	static int iqs621_als_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long mask)
	{
	struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
	struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
	int ret;
	__le16 val_buf;

	switch (chan->type) {
	case IIO_INTENSITY:
	ret = regmap_read(iqs62x->regmap, chan->address, val);
	if (ret)
	return ret;

	*val &= IQS621_ALS_FLAGS_RANGE;
	return IIO_VAL_INT;

	case IIO_PROXIMITY:
	case IIO_LIGHT:
	ret = regmap_raw_read(iqs62x->regmap, chan->address, &val_buf,
	sizeof(val_buf));
	if (ret)
	return ret;

	*val = le16_to_cpu(val_buf);
	return IIO_VAL_INT;

	default:
	return -EINVAL;
	}
	}

	static int iqs621_als_read_event_config(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan,
	enum iio_event_type type,
	enum iio_event_direction dir)
	{
	struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
	int ret;

	mutex_lock(&iqs621_als->lock);

	switch (chan->type) {
	case IIO_LIGHT:
	ret = iqs621_als->light_en;
	break;

	case IIO_INTENSITY:
	ret = iqs621_als->range_en;
	break;

	case IIO_PROXIMITY:
	ret = iqs621_als->prox_en;
	break;

	default:
	ret = -EINVAL;
	}

	mutex_unlock(&iqs621_als->lock);

	return ret;
	}

	static int iqs621_als_write_event_config(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan,
	enum iio_event_type type,
	enum iio_event_direction dir,
	int state)
	{
	struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
	struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
	unsigned int val;
	int ret;

	mutex_lock(&iqs621_als->lock);

	ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->als_flags, &val);
	if (ret)
	goto err_mutex;
	iqs621_als->als_flags = val;

	switch (chan->type) {
	case IIO_LIGHT:
	ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
	iqs62x->dev_desc->als_mask,
	iqs621_als->range_en \|\| state ? 0 :
	0xFF);
	if (!ret)
	iqs621_als->light_en = state;
	break;

	case IIO_INTENSITY:
	ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
	iqs62x->dev_desc->als_mask,
	iqs621_als->light_en \|\| state ? 0 :
	0xFF);
	if (!ret)
	iqs621_als->range_en = state;
	break;

	case IIO_PROXIMITY:
	ret = regmap_read(iqs62x->regmap, IQS622_IR_FLAGS, &val);
	if (ret)
	goto err_mutex;
	iqs621_als->ir_flags = val;

	ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
	iqs62x->dev_desc->ir_mask,
	state ? 0 : 0xFF);
	if (!ret)
	iqs621_als->prox_en = state;
	break;

	default:
	ret = -EINVAL;
	}

	err_mutex:
	mutex_unlock(&iqs621_als->lock);

	return ret;
	}

	static int iqs621_als_read_event_value(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 iqs621_als_private *iqs621_als = iio_priv(indio_dev);
	int ret = IIO_VAL_INT;

	mutex_lock(&iqs621_als->lock);

	switch (dir) {
	case IIO_EV_DIR_RISING:
	val = iqs621_als->thresh_light 16;
	break;

	case IIO_EV_DIR_FALLING:
	val = iqs621_als->thresh_dark 4;
	break;

	case IIO_EV_DIR_EITHER:
	if (iqs621_als->ir_flags_mask == IQS622_IR_FLAGS_TOUCH)
	val = iqs621_als->thresh_prox 4;
	else
	*val = iqs621_als->thresh_prox;
	break;

	default:
	ret = -EINVAL;
	}

	mutex_unlock(&iqs621_als->lock);

	return ret;
	}

	static int iqs621_als_write_event_value(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 iqs621_als_private *iqs621_als = iio_priv(indio_dev);
	struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
	unsigned int thresh_reg, thresh_val;
	u8 ir_flags_mask, *thresh_cache;
	int ret = -EINVAL;

	mutex_lock(&iqs621_als->lock);

	switch (dir) {
	case IIO_EV_DIR_RISING:
	thresh_reg = IQS621_ALS_THRESH_LIGHT;
	thresh_val = val / 16;

	thresh_cache = &iqs621_als->thresh_light;
	ir_flags_mask = 0;
	break;

	case IIO_EV_DIR_FALLING:
	thresh_reg = IQS621_ALS_THRESH_DARK;
	thresh_val = val / 4;

	thresh_cache = &iqs621_als->thresh_dark;
	ir_flags_mask = 0;
	break;

	case IIO_EV_DIR_EITHER:
	/*
	* The IQS622 supports two detection thresholds, both measured
	* in the same arbitrary units reported by read_raw: proximity
	* (0 through 255 in steps of 1), and touch (0 through 1020 in
	* steps of 4).
	*
	* Based on the single detection threshold chosen by the user,
	* select the hardware threshold that gives the best trade-off
	* between range and resolution.
	*
	* By default, the close-range (but coarse) touch threshold is
	* chosen during probe.
	*/
	switch (val) {
	case 0 ... 255:
	thresh_reg = IQS622_IR_THRESH_PROX;
	thresh_val = val;

	ir_flags_mask = IQS622_IR_FLAGS_PROX;
	break;

	case 256 ... 1020:
	thresh_reg = IQS622_IR_THRESH_TOUCH;
	thresh_val = val / 4;

	ir_flags_mask = IQS622_IR_FLAGS_TOUCH;
	break;

	default:
	goto err_mutex;
	}

	thresh_cache = &iqs621_als->thresh_prox;
	break;

	default:
	goto err_mutex;
	}

	if (thresh_val > 0xFF)
	goto err_mutex;

	ret = regmap_write(iqs62x->regmap, thresh_reg, thresh_val);
	if (ret)
	goto err_mutex;

	*thresh_cache = thresh_val;
	iqs621_als->ir_flags_mask = ir_flags_mask;

	err_mutex:
	mutex_unlock(&iqs621_als->lock);

	return ret;
	}

	static const struct iio_info iqs621_als_info = {
	.read_raw = &iqs621_als_read_raw,
	.read_event_config = iqs621_als_read_event_config,
	.write_event_config = iqs621_als_write_event_config,
	.read_event_value = iqs621_als_read_event_value,
	.write_event_value = iqs621_als_write_event_value,
	};

	static const struct iio_event_spec iqs621_als_range_events[] = {
	{
	.type = IIO_EV_TYPE_CHANGE,
	.dir = IIO_EV_DIR_EITHER,
	.mask_separate = BIT(IIO_EV_INFO_ENABLE),
	},
	};

	static const struct iio_event_spec iqs621_als_light_events[] = {
	{
	.type = IIO_EV_TYPE_THRESH,
	.dir = IIO_EV_DIR_EITHER,
	.mask_separate = BIT(IIO_EV_INFO_ENABLE),
	},
	{
	.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),
	},
	};

	static const struct iio_chan_spec iqs621_als_channels[] = {
	{
	.type = IIO_INTENSITY,
	.address = IQS621_ALS_FLAGS,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	.event_spec = iqs621_als_range_events,
	.num_event_specs = ARRAY_SIZE(iqs621_als_range_events),
	},
	{
	.type = IIO_LIGHT,
	.address = IQS621_ALS_UI_OUT,
	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
	.event_spec = iqs621_als_light_events,
	.num_event_specs = ARRAY_SIZE(iqs621_als_light_events),
	},
	};

	static const struct iio_event_spec iqs622_als_prox_events[] = {
	{
	.type = IIO_EV_TYPE_THRESH,
	.dir = IIO_EV_DIR_EITHER,
	.mask_separate = BIT(IIO_EV_INFO_ENABLE) \|
	BIT(IIO_EV_INFO_VALUE),
	},
	};

	static const struct iio_chan_spec iqs622_als_channels[] = {
	{
	.type = IIO_INTENSITY,
	.channel2 = IIO_MOD_LIGHT_BOTH,
	.address = IQS622_ALS_FLAGS,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	.event_spec = iqs621_als_range_events,
	.num_event_specs = ARRAY_SIZE(iqs621_als_range_events),
	.modified = true,
	},
	{
	.type = IIO_INTENSITY,
	.channel2 = IIO_MOD_LIGHT_IR,
	.address = IQS622_IR_RANGE,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	.modified = true,
	},
	{
	.type = IIO_PROXIMITY,
	.address = IQS622_IR_UI_OUT,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	.event_spec = iqs622_als_prox_events,
	.num_event_specs = ARRAY_SIZE(iqs622_als_prox_events),
	},
	};

	static int iqs621_als_probe(struct platform_device *pdev)
	{
	struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
	struct iqs621_als_private *iqs621_als;
	struct iio_dev *indio_dev;
	unsigned int val;
	int ret;

	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*iqs621_als));
	if (!indio_dev)
	return -ENOMEM;

	iqs621_als = iio_priv(indio_dev);
	iqs621_als->iqs62x = iqs62x;
	iqs621_als->indio_dev = indio_dev;

	if (iqs62x->dev_desc->prod_num == IQS622_PROD_NUM) {
	ret = regmap_read(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
	&val);
	if (ret)
	return ret;
	iqs621_als->thresh_prox = val;
	iqs621_als->ir_flags_mask = IQS622_IR_FLAGS_TOUCH;

	indio_dev->channels = iqs622_als_channels;
	indio_dev->num_channels = ARRAY_SIZE(iqs622_als_channels);
	} else {
	ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
	&val);
	if (ret)
	return ret;
	iqs621_als->thresh_light = val;

	ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
	&val);
	if (ret)
	return ret;
	iqs621_als->thresh_dark = val;

	indio_dev->channels = iqs621_als_channels;
	indio_dev->num_channels = ARRAY_SIZE(iqs621_als_channels);
	}

	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->name = iqs62x->dev_desc->dev_name;
	indio_dev->info = &iqs621_als_info;

	mutex_init(&iqs621_als->lock);

	iqs621_als->notifier.notifier_call = iqs621_als_notifier;
	ret = blocking_notifier_chain_register(&iqs621_als->iqs62x->nh,
	&iqs621_als->notifier);
	if (ret) {
	dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret);
	return ret;
	}

	ret = devm_add_action_or_reset(&pdev->dev,
	iqs621_als_notifier_unregister,
	iqs621_als);
	if (ret)
	return ret;

	return devm_iio_device_register(&pdev->dev, indio_dev);
	}

	static struct platform_driver iqs621_als_platform_driver = {
	.driver = {
	.name = "iqs621-als",
	},
	.probe = iqs621_als_probe,
	};
	module_platform_driver(iqs621_als_platform_driver);

	MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
	MODULE_DESCRIPTION("Azoteq IQS621/622 Ambient Light Sensors");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:iqs621-als");