[v1,2/4] iio: light: lm3533-als: Remove the driver

The driver has no in kernel users and requires a board file
to be instantiated. Remove basically a dead code.

If ever needed, it can be reinstantiated and converted to one
that uses firmware node interfaces.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/iio/light/Kconfig      |  17 -
 drivers/iio/light/Makefile     |   1 -
 drivers/iio/light/lm3533-als.c | 922 ---------------------------------
 3 files changed, 940 deletions(-)
 delete mode 100644 drivers/iio/light/lm3533-als.c

On Fri, 31 May 2024 19:56:14 +0300
Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote:

> The driver has no in kernel users and requires a board file
> to be instantiated. Remove basically a dead code.
> 
> If ever needed, it can be reinstantiated and converted to one
> that uses firmware node interfaces.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Given the header removal in patch 4, I assume these all need to go together
via mfd.

Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
>  drivers/iio/light/Kconfig      |  17 -
>  drivers/iio/light/Makefile     |   1 -
>  drivers/iio/light/lm3533-als.c | 922 ---------------------------------
>  3 files changed, 940 deletions(-)
>  delete mode 100644 drivers/iio/light/lm3533-als.c
> 
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 9a587d403118..827eee527a62 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -358,23 +358,6 @@ config RPR0521
>  	  To compile this driver as a module, choose M here:
>  	  the module will be called rpr0521.
>  
> -config SENSORS_LM3533
> -	tristate "LM3533 ambient light sensor"
> -	depends on MFD_LM3533
> -	help
> -	  If you say yes here you get support for the ambient light sensor
> -	  interface on National Semiconductor / TI LM3533 Lighting Power
> -	  chips.
> -
> -	  The sensor interface can be used to control the LEDs and backlights
> -	  of the chip through defining five light zones and three sets of
> -	  corresponding output-current values.
> -
> -	  The driver provides raw and mean adc readings along with the current
> -	  light zone through sysfs. A threshold event can be generated on zone
> -	  changes. The ALS-control output values can be set per zone for the
> -	  three current output channels.
> -
>  config LTR390
>  	tristate "LTR-390UV-01 ambient light and UV sensor"
>  	depends on I2C
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index a30f906e91ba..6fd7b6f95d1d 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -31,7 +31,6 @@ obj-$(CONFIG_SENSORS_ISL29028)	+= isl29028.o
>  obj-$(CONFIG_ISL29125)		+= isl29125.o
>  obj-$(CONFIG_ISL76682)		+= isl76682.o
>  obj-$(CONFIG_JSA1212)		+= jsa1212.o
> -obj-$(CONFIG_SENSORS_LM3533)	+= lm3533-als.o
>  obj-$(CONFIG_LTR390)		+= ltr390.o
>  obj-$(CONFIG_LTR501)		+= ltr501.o
>  obj-$(CONFIG_LTRF216A)		+= ltrf216a.o
> diff --git a/drivers/iio/light/lm3533-als.c b/drivers/iio/light/lm3533-als.c
> deleted file mode 100644
> index 7800f7fa51b7..000000000000
> --- a/drivers/iio/light/lm3533-als.c
> +++ /dev/null
> @@ -1,922 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-or-later
> -/*
> - * lm3533-als.c -- LM3533 Ambient Light Sensor driver
> - *
> - * Copyright (C) 2011-2012 Texas Instruments
> - *
> - * Author: Johan Hovold <jhovold@gmail.com>
> - */
> -
> -#include <linux/atomic.h>
> -#include <linux/fs.h>
> -#include <linux/interrupt.h>
> -#include <linux/io.h>
> -#include <linux/iio/events.h>
> -#include <linux/iio/iio.h>
> -#include <linux/module.h>
> -#include <linux/mutex.h>
> -#include <linux/mfd/core.h>
> -#include <linux/platform_device.h>
> -#include <linux/slab.h>
> -#include <linux/uaccess.h>
> -
> -#include <linux/mfd/lm3533.h>
> -
> -
> -#define LM3533_ALS_RESISTOR_MIN			1
> -#define LM3533_ALS_RESISTOR_MAX			127
> -#define LM3533_ALS_CHANNEL_CURRENT_MAX		2
> -#define LM3533_ALS_THRESH_MAX			3
> -#define LM3533_ALS_ZONE_MAX			4
> -
> -#define LM3533_REG_ALS_RESISTOR_SELECT		0x30
> -#define LM3533_REG_ALS_CONF			0x31
> -#define LM3533_REG_ALS_ZONE_INFO		0x34
> -#define LM3533_REG_ALS_READ_ADC_RAW		0x37
> -#define LM3533_REG_ALS_READ_ADC_AVERAGE		0x38
> -#define LM3533_REG_ALS_BOUNDARY_BASE		0x50
> -#define LM3533_REG_ALS_TARGET_BASE		0x60
> -
> -#define LM3533_ALS_ENABLE_MASK			0x01
> -#define LM3533_ALS_INPUT_MODE_MASK		0x02
> -#define LM3533_ALS_INT_ENABLE_MASK		0x01
> -
> -#define LM3533_ALS_ZONE_SHIFT			2
> -#define LM3533_ALS_ZONE_MASK			0x1c
> -
> -#define LM3533_ALS_FLAG_INT_ENABLED		1
> -
> -
> -struct lm3533_als {
> -	struct lm3533 *lm3533;
> -	struct platform_device *pdev;
> -
> -	unsigned long flags;
> -	int irq;
> -
> -	atomic_t zone;
> -	struct mutex thresh_mutex;
> -};
> -
> -
> -static int lm3533_als_get_adc(struct iio_dev *indio_dev, bool average,
> -								int *adc)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 reg;
> -	u8 val;
> -	int ret;
> -
> -	if (average)
> -		reg = LM3533_REG_ALS_READ_ADC_AVERAGE;
> -	else
> -		reg = LM3533_REG_ALS_READ_ADC_RAW;
> -
> -	ret = lm3533_read(als->lm3533, reg, &val);
> -	if (ret) {
> -		dev_err(&indio_dev->dev, "failed to read adc\n");
> -		return ret;
> -	}
> -
> -	*adc = val;
> -
> -	return 0;
> -}
> -
> -static int _lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 val;
> -	int ret;
> -
> -	ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val);
> -	if (ret) {
> -		dev_err(&indio_dev->dev, "failed to read zone\n");
> -		return ret;
> -	}
> -
> -	val = (val & LM3533_ALS_ZONE_MASK) >> LM3533_ALS_ZONE_SHIFT;
> -	*zone = min_t(u8, val, LM3533_ALS_ZONE_MAX);
> -
> -	return 0;
> -}
> -
> -static int lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	int ret;
> -
> -	if (test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags)) {
> -		*zone = atomic_read(&als->zone);
> -	} else {
> -		ret = _lm3533_als_get_zone(indio_dev, zone);
> -		if (ret)
> -			return ret;
> -	}
> -
> -	return 0;
> -}
> -
> -/*
> - * channel	output channel 0..2
> - * zone		zone 0..4
> - */
> -static inline u8 lm3533_als_get_target_reg(unsigned channel, unsigned zone)
> -{
> -	return LM3533_REG_ALS_TARGET_BASE + 5 * channel + zone;
> -}
> -
> -static int lm3533_als_get_target(struct iio_dev *indio_dev, unsigned channel,
> -							unsigned zone, u8 *val)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 reg;
> -	int ret;
> -
> -	if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX)
> -		return -EINVAL;
> -
> -	if (zone > LM3533_ALS_ZONE_MAX)
> -		return -EINVAL;
> -
> -	reg = lm3533_als_get_target_reg(channel, zone);
> -	ret = lm3533_read(als->lm3533, reg, val);
> -	if (ret)
> -		dev_err(&indio_dev->dev, "failed to get target current\n");
> -
> -	return ret;
> -}
> -
> -static int lm3533_als_set_target(struct iio_dev *indio_dev, unsigned channel,
> -							unsigned zone, u8 val)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 reg;
> -	int ret;
> -
> -	if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX)
> -		return -EINVAL;
> -
> -	if (zone > LM3533_ALS_ZONE_MAX)
> -		return -EINVAL;
> -
> -	reg = lm3533_als_get_target_reg(channel, zone);
> -	ret = lm3533_write(als->lm3533, reg, val);
> -	if (ret)
> -		dev_err(&indio_dev->dev, "failed to set target current\n");
> -
> -	return ret;
> -}
> -
> -static int lm3533_als_get_current(struct iio_dev *indio_dev, unsigned channel,
> -								int *val)
> -{
> -	u8 zone;
> -	u8 target;
> -	int ret;
> -
> -	ret = lm3533_als_get_zone(indio_dev, &zone);
> -	if (ret)
> -		return ret;
> -
> -	ret = lm3533_als_get_target(indio_dev, channel, zone, &target);
> -	if (ret)
> -		return ret;
> -
> -	*val = target;
> -
> -	return 0;
> -}
> -
> -static int lm3533_als_read_raw(struct iio_dev *indio_dev,
> -				struct iio_chan_spec const *chan,
> -				int *val, int *val2, long mask)
> -{
> -	int ret;
> -
> -	switch (mask) {
> -	case IIO_CHAN_INFO_RAW:
> -		switch (chan->type) {
> -		case IIO_LIGHT:
> -			ret = lm3533_als_get_adc(indio_dev, false, val);
> -			break;
> -		case IIO_CURRENT:
> -			ret = lm3533_als_get_current(indio_dev, chan->channel,
> -									val);
> -			break;
> -		default:
> -			return -EINVAL;
> -		}
> -		break;
> -	case IIO_CHAN_INFO_AVERAGE_RAW:
> -		ret = lm3533_als_get_adc(indio_dev, true, val);
> -		break;
> -	default:
> -		return -EINVAL;
> -	}
> -
> -	if (ret)
> -		return ret;
> -
> -	return IIO_VAL_INT;
> -}
> -
> -#define CHANNEL_CURRENT(_channel)					\
> -	{								\
> -		.type		= IIO_CURRENT,				\
> -		.channel	= _channel,				\
> -		.indexed	= true,					\
> -		.output		= true,					\
> -		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
> -	}
> -
> -static const struct iio_chan_spec lm3533_als_channels[] = {
> -	{
> -		.type		= IIO_LIGHT,
> -		.channel	= 0,
> -		.indexed	= true,
> -		.info_mask_separate = BIT(IIO_CHAN_INFO_AVERAGE_RAW) |
> -				   BIT(IIO_CHAN_INFO_RAW),
> -	},
> -	CHANNEL_CURRENT(0),
> -	CHANNEL_CURRENT(1),
> -	CHANNEL_CURRENT(2),
> -};
> -
> -static irqreturn_t lm3533_als_isr(int irq, void *dev_id)
> -{
> -
> -	struct iio_dev *indio_dev = dev_id;
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 zone;
> -	int ret;
> -
> -	/* Clear interrupt by reading the ALS zone register. */
> -	ret = _lm3533_als_get_zone(indio_dev, &zone);
> -	if (ret)
> -		goto out;
> -
> -	atomic_set(&als->zone, zone);
> -
> -	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));
> -out:
> -	return IRQ_HANDLED;
> -}
> -
> -static int lm3533_als_set_int_mode(struct iio_dev *indio_dev, int enable)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 mask = LM3533_ALS_INT_ENABLE_MASK;
> -	u8 val;
> -	int ret;
> -
> -	if (enable)
> -		val = mask;
> -	else
> -		val = 0;
> -
> -	ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, val, mask);
> -	if (ret) {
> -		dev_err(&indio_dev->dev, "failed to set int mode %d\n",
> -								enable);
> -		return ret;
> -	}
> -
> -	return 0;
> -}
> -
> -static int lm3533_als_get_int_mode(struct iio_dev *indio_dev, int *enable)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 mask = LM3533_ALS_INT_ENABLE_MASK;
> -	u8 val;
> -	int ret;
> -
> -	ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val);
> -	if (ret) {
> -		dev_err(&indio_dev->dev, "failed to get int mode\n");
> -		return ret;
> -	}
> -
> -	*enable = !!(val & mask);
> -
> -	return 0;
> -}
> -
> -static inline u8 lm3533_als_get_threshold_reg(unsigned nr, bool raising)
> -{
> -	u8 offset = !raising;
> -
> -	return LM3533_REG_ALS_BOUNDARY_BASE + 2 * nr + offset;
> -}
> -
> -static int lm3533_als_get_threshold(struct iio_dev *indio_dev, unsigned nr,
> -							bool raising, u8 *val)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 reg;
> -	int ret;
> -
> -	if (nr > LM3533_ALS_THRESH_MAX)
> -		return -EINVAL;
> -
> -	reg = lm3533_als_get_threshold_reg(nr, raising);
> -	ret = lm3533_read(als->lm3533, reg, val);
> -	if (ret)
> -		dev_err(&indio_dev->dev, "failed to get threshold\n");
> -
> -	return ret;
> -}
> -
> -static int lm3533_als_set_threshold(struct iio_dev *indio_dev, unsigned nr,
> -							bool raising, u8 val)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 val2;
> -	u8 reg, reg2;
> -	int ret;
> -
> -	if (nr > LM3533_ALS_THRESH_MAX)
> -		return -EINVAL;
> -
> -	reg = lm3533_als_get_threshold_reg(nr, raising);
> -	reg2 = lm3533_als_get_threshold_reg(nr, !raising);
> -
> -	mutex_lock(&als->thresh_mutex);
> -	ret = lm3533_read(als->lm3533, reg2, &val2);
> -	if (ret) {
> -		dev_err(&indio_dev->dev, "failed to get threshold\n");
> -		goto out;
> -	}
> -	/*
> -	 * This device does not allow negative hysteresis (in fact, it uses
> -	 * whichever value is smaller as the lower bound) so we need to make
> -	 * sure that thresh_falling <= thresh_raising.
> -	 */
> -	if ((raising && (val < val2)) || (!raising && (val > val2))) {
> -		ret = -EINVAL;
> -		goto out;
> -	}
> -
> -	ret = lm3533_write(als->lm3533, reg, val);
> -	if (ret) {
> -		dev_err(&indio_dev->dev, "failed to set threshold\n");
> -		goto out;
> -	}
> -out:
> -	mutex_unlock(&als->thresh_mutex);
> -
> -	return ret;
> -}
> -
> -static int lm3533_als_get_hysteresis(struct iio_dev *indio_dev, unsigned nr,
> -								u8 *val)
> -{
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	u8 falling;
> -	u8 raising;
> -	int ret;
> -
> -	if (nr > LM3533_ALS_THRESH_MAX)
> -		return -EINVAL;
> -
> -	mutex_lock(&als->thresh_mutex);
> -	ret = lm3533_als_get_threshold(indio_dev, nr, false, &falling);
> -	if (ret)
> -		goto out;
> -	ret = lm3533_als_get_threshold(indio_dev, nr, true, &raising);
> -	if (ret)
> -		goto out;
> -
> -	*val = raising - falling;
> -out:
> -	mutex_unlock(&als->thresh_mutex);
> -
> -	return ret;
> -}
> -
> -static ssize_t show_thresh_either_en(struct device *dev,
> -					struct device_attribute *attr,
> -					char *buf)
> -{
> -	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	int enable;
> -	int ret;
> -
> -	if (als->irq) {
> -		ret = lm3533_als_get_int_mode(indio_dev, &enable);
> -		if (ret)
> -			return ret;
> -	} else {
> -		enable = 0;
> -	}
> -
> -	return sysfs_emit(buf, "%u\n", enable);
> -}
> -
> -static ssize_t store_thresh_either_en(struct device *dev,
> -					struct device_attribute *attr,
> -					const char *buf, size_t len)
> -{
> -	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -	unsigned long enable;
> -	bool int_enabled;
> -	u8 zone;
> -	int ret;
> -
> -	if (!als->irq)
> -		return -EBUSY;
> -
> -	if (kstrtoul(buf, 0, &enable))
> -		return -EINVAL;
> -
> -	int_enabled = test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
> -
> -	if (enable && !int_enabled) {
> -		ret = lm3533_als_get_zone(indio_dev, &zone);
> -		if (ret)
> -			return ret;
> -
> -		atomic_set(&als->zone, zone);
> -
> -		set_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
> -	}
> -
> -	ret = lm3533_als_set_int_mode(indio_dev, enable);
> -	if (ret) {
> -		if (!int_enabled)
> -			clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
> -
> -		return ret;
> -	}
> -
> -	if (!enable)
> -		clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
> -
> -	return len;
> -}
> -
> -static ssize_t show_zone(struct device *dev,
> -				struct device_attribute *attr, char *buf)
> -{
> -	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> -	u8 zone;
> -	int ret;
> -
> -	ret = lm3533_als_get_zone(indio_dev, &zone);
> -	if (ret)
> -		return ret;
> -
> -	return sysfs_emit(buf, "%u\n", zone);
> -}
> -
> -enum lm3533_als_attribute_type {
> -	LM3533_ATTR_TYPE_HYSTERESIS,
> -	LM3533_ATTR_TYPE_TARGET,
> -	LM3533_ATTR_TYPE_THRESH_FALLING,
> -	LM3533_ATTR_TYPE_THRESH_RAISING,
> -};
> -
> -struct lm3533_als_attribute {
> -	struct device_attribute dev_attr;
> -	enum lm3533_als_attribute_type type;
> -	u8 val1;
> -	u8 val2;
> -};
> -
> -static inline struct lm3533_als_attribute *
> -to_lm3533_als_attr(struct device_attribute *attr)
> -{
> -	return container_of(attr, struct lm3533_als_attribute, dev_attr);
> -}
> -
> -static ssize_t show_als_attr(struct device *dev,
> -					struct device_attribute *attr,
> -					char *buf)
> -{
> -	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> -	struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr);
> -	u8 val;
> -	int ret;
> -
> -	switch (als_attr->type) {
> -	case LM3533_ATTR_TYPE_HYSTERESIS:
> -		ret = lm3533_als_get_hysteresis(indio_dev, als_attr->val1,
> -									&val);
> -		break;
> -	case LM3533_ATTR_TYPE_TARGET:
> -		ret = lm3533_als_get_target(indio_dev, als_attr->val1,
> -							als_attr->val2, &val);
> -		break;
> -	case LM3533_ATTR_TYPE_THRESH_FALLING:
> -		ret = lm3533_als_get_threshold(indio_dev, als_attr->val1,
> -								false, &val);
> -		break;
> -	case LM3533_ATTR_TYPE_THRESH_RAISING:
> -		ret = lm3533_als_get_threshold(indio_dev, als_attr->val1,
> -								true, &val);
> -		break;
> -	default:
> -		ret = -ENXIO;
> -	}
> -
> -	if (ret)
> -		return ret;
> -
> -	return sysfs_emit(buf, "%u\n", val);
> -}
> -
> -static ssize_t store_als_attr(struct device *dev,
> -					struct device_attribute *attr,
> -					const char *buf, size_t len)
> -{
> -	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> -	struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr);
> -	u8 val;
> -	int ret;
> -
> -	if (kstrtou8(buf, 0, &val))
> -		return -EINVAL;
> -
> -	switch (als_attr->type) {
> -	case LM3533_ATTR_TYPE_TARGET:
> -		ret = lm3533_als_set_target(indio_dev, als_attr->val1,
> -							als_attr->val2, val);
> -		break;
> -	case LM3533_ATTR_TYPE_THRESH_FALLING:
> -		ret = lm3533_als_set_threshold(indio_dev, als_attr->val1,
> -								false, val);
> -		break;
> -	case LM3533_ATTR_TYPE_THRESH_RAISING:
> -		ret = lm3533_als_set_threshold(indio_dev, als_attr->val1,
> -								true, val);
> -		break;
> -	default:
> -		ret = -ENXIO;
> -	}
> -
> -	if (ret)
> -		return ret;
> -
> -	return len;
> -}
> -
> -#define ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2)	\
> -	{ .dev_attr	= __ATTR(_name, _mode, _show, _store),		\
> -	  .type		= _type,					\
> -	  .val1		= _val1,					\
> -	  .val2		= _val2 }
> -
> -#define LM3533_ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) \
> -	struct lm3533_als_attribute lm3533_als_attr_##_name =		  \
> -		ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2)
> -
> -#define ALS_TARGET_ATTR_RW(_channel, _zone)				\
> -	LM3533_ALS_ATTR(out_current##_channel##_current##_zone##_raw,	\
> -				S_IRUGO | S_IWUSR,			\
> -				show_als_attr, store_als_attr,		\
> -				LM3533_ATTR_TYPE_TARGET, _channel, _zone)
> -/*
> - * ALS output current values (ALS mapper targets)
> - *
> - * out_current[0-2]_current[0-4]_raw		0-255
> - */
> -static ALS_TARGET_ATTR_RW(0, 0);
> -static ALS_TARGET_ATTR_RW(0, 1);
> -static ALS_TARGET_ATTR_RW(0, 2);
> -static ALS_TARGET_ATTR_RW(0, 3);
> -static ALS_TARGET_ATTR_RW(0, 4);
> -
> -static ALS_TARGET_ATTR_RW(1, 0);
> -static ALS_TARGET_ATTR_RW(1, 1);
> -static ALS_TARGET_ATTR_RW(1, 2);
> -static ALS_TARGET_ATTR_RW(1, 3);
> -static ALS_TARGET_ATTR_RW(1, 4);
> -
> -static ALS_TARGET_ATTR_RW(2, 0);
> -static ALS_TARGET_ATTR_RW(2, 1);
> -static ALS_TARGET_ATTR_RW(2, 2);
> -static ALS_TARGET_ATTR_RW(2, 3);
> -static ALS_TARGET_ATTR_RW(2, 4);
> -
> -#define ALS_THRESH_FALLING_ATTR_RW(_nr)					\
> -	LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_falling_value,	\
> -			S_IRUGO | S_IWUSR,				\
> -			show_als_attr, store_als_attr,		\
> -			LM3533_ATTR_TYPE_THRESH_FALLING, _nr, 0)
> -
> -#define ALS_THRESH_RAISING_ATTR_RW(_nr)					\
> -	LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_raising_value,	\
> -			S_IRUGO | S_IWUSR,				\
> -			show_als_attr, store_als_attr,			\
> -			LM3533_ATTR_TYPE_THRESH_RAISING, _nr, 0)
> -/*
> - * ALS Zone thresholds (boundaries)
> - *
> - * in_illuminance0_thresh[0-3]_falling_value	0-255
> - * in_illuminance0_thresh[0-3]_raising_value	0-255
> - */
> -static ALS_THRESH_FALLING_ATTR_RW(0);
> -static ALS_THRESH_FALLING_ATTR_RW(1);
> -static ALS_THRESH_FALLING_ATTR_RW(2);
> -static ALS_THRESH_FALLING_ATTR_RW(3);
> -
> -static ALS_THRESH_RAISING_ATTR_RW(0);
> -static ALS_THRESH_RAISING_ATTR_RW(1);
> -static ALS_THRESH_RAISING_ATTR_RW(2);
> -static ALS_THRESH_RAISING_ATTR_RW(3);
> -
> -#define ALS_HYSTERESIS_ATTR_RO(_nr)					\
> -	LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_hysteresis,	\
> -			S_IRUGO, show_als_attr, NULL,			\
> -			LM3533_ATTR_TYPE_HYSTERESIS, _nr, 0)
> -/*
> - * ALS Zone threshold hysteresis
> - *
> - * threshY_hysteresis = threshY_raising - threshY_falling
> - *
> - * in_illuminance0_thresh[0-3]_hysteresis	0-255
> - * in_illuminance0_thresh[0-3]_hysteresis	0-255
> - */
> -static ALS_HYSTERESIS_ATTR_RO(0);
> -static ALS_HYSTERESIS_ATTR_RO(1);
> -static ALS_HYSTERESIS_ATTR_RO(2);
> -static ALS_HYSTERESIS_ATTR_RO(3);
> -
> -#define ILLUMINANCE_ATTR_RO(_name) \
> -	DEVICE_ATTR(in_illuminance0_##_name, S_IRUGO, show_##_name, NULL)
> -#define ILLUMINANCE_ATTR_RW(_name) \
> -	DEVICE_ATTR(in_illuminance0_##_name, S_IRUGO | S_IWUSR, \
> -						show_##_name, store_##_name)
> -/*
> - * ALS Zone threshold-event enable
> - *
> - * in_illuminance0_thresh_either_en		0,1
> - */
> -static ILLUMINANCE_ATTR_RW(thresh_either_en);
> -
> -/*
> - * ALS Current Zone
> - *
> - * in_illuminance0_zone		0-4
> - */
> -static ILLUMINANCE_ATTR_RO(zone);
> -
> -static struct attribute *lm3533_als_event_attributes[] = {
> -	&dev_attr_in_illuminance0_thresh_either_en.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh0_falling_value.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh0_hysteresis.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh0_raising_value.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh1_falling_value.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh1_hysteresis.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh1_raising_value.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh2_falling_value.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh2_hysteresis.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh2_raising_value.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh3_falling_value.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh3_hysteresis.dev_attr.attr,
> -	&lm3533_als_attr_in_illuminance0_thresh3_raising_value.dev_attr.attr,
> -	NULL
> -};
> -
> -static const struct attribute_group lm3533_als_event_attribute_group = {
> -	.attrs = lm3533_als_event_attributes
> -};
> -
> -static struct attribute *lm3533_als_attributes[] = {
> -	&dev_attr_in_illuminance0_zone.attr,
> -	&lm3533_als_attr_out_current0_current0_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current0_current1_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current0_current2_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current0_current3_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current0_current4_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current1_current0_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current1_current1_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current1_current2_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current1_current3_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current1_current4_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current2_current0_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current2_current1_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current2_current2_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current2_current3_raw.dev_attr.attr,
> -	&lm3533_als_attr_out_current2_current4_raw.dev_attr.attr,
> -	NULL
> -};
> -
> -static const struct attribute_group lm3533_als_attribute_group = {
> -	.attrs = lm3533_als_attributes
> -};
> -
> -static int lm3533_als_set_input_mode(struct lm3533_als *als, bool pwm_mode)
> -{
> -	u8 mask = LM3533_ALS_INPUT_MODE_MASK;
> -	u8 val;
> -	int ret;
> -
> -	if (pwm_mode)
> -		val = mask;	/* pwm input */
> -	else
> -		val = 0;	/* analog input */
> -
> -	ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, val, mask);
> -	if (ret) {
> -		dev_err(&als->pdev->dev, "failed to set input mode %d\n",
> -								pwm_mode);
> -		return ret;
> -	}
> -
> -	return 0;
> -}
> -
> -static int lm3533_als_set_resistor(struct lm3533_als *als, u8 val)
> -{
> -	int ret;
> -
> -	if (val < LM3533_ALS_RESISTOR_MIN || val > LM3533_ALS_RESISTOR_MAX) {
> -		dev_err(&als->pdev->dev, "invalid resistor value\n");
> -		return -EINVAL;
> -	}
> -
> -	ret = lm3533_write(als->lm3533, LM3533_REG_ALS_RESISTOR_SELECT, val);
> -	if (ret) {
> -		dev_err(&als->pdev->dev, "failed to set resistor\n");
> -		return ret;
> -	}
> -
> -	return 0;
> -}
> -
> -static int lm3533_als_setup(struct lm3533_als *als,
> -			    struct lm3533_als_platform_data *pdata)
> -{
> -	int ret;
> -
> -	ret = lm3533_als_set_input_mode(als, pdata->pwm_mode);
> -	if (ret)
> -		return ret;
> -
> -	/* ALS input is always high impedance in PWM-mode. */
> -	if (!pdata->pwm_mode) {
> -		ret = lm3533_als_set_resistor(als, pdata->r_select);
> -		if (ret)
> -			return ret;
> -	}
> -
> -	return 0;
> -}
> -
> -static int lm3533_als_setup_irq(struct lm3533_als *als, void *dev)
> -{
> -	u8 mask = LM3533_ALS_INT_ENABLE_MASK;
> -	int ret;
> -
> -	/* Make sure interrupts are disabled. */
> -	ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, 0, mask);
> -	if (ret) {
> -		dev_err(&als->pdev->dev, "failed to disable interrupts\n");
> -		return ret;
> -	}
> -
> -	ret = request_threaded_irq(als->irq, NULL, lm3533_als_isr,
> -					IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> -					dev_name(&als->pdev->dev), dev);
> -	if (ret) {
> -		dev_err(&als->pdev->dev, "failed to request irq %d\n",
> -								als->irq);
> -		return ret;
> -	}
> -
> -	return 0;
> -}
> -
> -static int lm3533_als_enable(struct lm3533_als *als)
> -{
> -	u8 mask = LM3533_ALS_ENABLE_MASK;
> -	int ret;
> -
> -	ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, mask, mask);
> -	if (ret)
> -		dev_err(&als->pdev->dev, "failed to enable ALS\n");
> -
> -	return ret;
> -}
> -
> -static int lm3533_als_disable(struct lm3533_als *als)
> -{
> -	u8 mask = LM3533_ALS_ENABLE_MASK;
> -	int ret;
> -
> -	ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, 0, mask);
> -	if (ret)
> -		dev_err(&als->pdev->dev, "failed to disable ALS\n");
> -
> -	return ret;
> -}
> -
> -static const struct iio_info lm3533_als_info = {
> -	.attrs		= &lm3533_als_attribute_group,
> -	.event_attrs	= &lm3533_als_event_attribute_group,
> -	.read_raw	= &lm3533_als_read_raw,
> -};
> -
> -static int lm3533_als_probe(struct platform_device *pdev)
> -{
> -	struct lm3533 *lm3533;
> -	struct lm3533_als_platform_data *pdata;
> -	struct lm3533_als *als;
> -	struct iio_dev *indio_dev;
> -	int ret;
> -
> -	lm3533 = dev_get_drvdata(pdev->dev.parent);
> -	if (!lm3533)
> -		return -EINVAL;
> -
> -	pdata = pdev->dev.platform_data;
> -	if (!pdata) {
> -		dev_err(&pdev->dev, "no platform data\n");
> -		return -EINVAL;
> -	}
> -
> -	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*als));
> -	if (!indio_dev)
> -		return -ENOMEM;
> -
> -	indio_dev->info = &lm3533_als_info;
> -	indio_dev->channels = lm3533_als_channels;
> -	indio_dev->num_channels = ARRAY_SIZE(lm3533_als_channels);
> -	indio_dev->name = dev_name(&pdev->dev);
> -	iio_device_set_parent(indio_dev, pdev->dev.parent);
> -	indio_dev->modes = INDIO_DIRECT_MODE;
> -
> -	als = iio_priv(indio_dev);
> -	als->lm3533 = lm3533;
> -	als->pdev = pdev;
> -	als->irq = lm3533->irq;
> -	atomic_set(&als->zone, 0);
> -	mutex_init(&als->thresh_mutex);
> -
> -	platform_set_drvdata(pdev, indio_dev);
> -
> -	if (als->irq) {
> -		ret = lm3533_als_setup_irq(als, indio_dev);
> -		if (ret)
> -			return ret;
> -	}
> -
> -	ret = lm3533_als_setup(als, pdata);
> -	if (ret)
> -		goto err_free_irq;
> -
> -	ret = lm3533_als_enable(als);
> -	if (ret)
> -		goto err_free_irq;
> -
> -	ret = iio_device_register(indio_dev);
> -	if (ret) {
> -		dev_err(&pdev->dev, "failed to register ALS\n");
> -		goto err_disable;
> -	}
> -
> -	return 0;
> -
> -err_disable:
> -	lm3533_als_disable(als);
> -err_free_irq:
> -	if (als->irq)
> -		free_irq(als->irq, indio_dev);
> -
> -	return ret;
> -}
> -
> -static void lm3533_als_remove(struct platform_device *pdev)
> -{
> -	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> -	struct lm3533_als *als = iio_priv(indio_dev);
> -
> -	lm3533_als_set_int_mode(indio_dev, false);
> -	iio_device_unregister(indio_dev);
> -	lm3533_als_disable(als);
> -	if (als->irq)
> -		free_irq(als->irq, indio_dev);
> -}
> -
> -static struct platform_driver lm3533_als_driver = {
> -	.driver	= {
> -		.name	= "lm3533-als",
> -	},
> -	.probe		= lm3533_als_probe,
> -	.remove_new	= lm3533_als_remove,
> -};
> -module_platform_driver(lm3533_als_driver);
> -
> -MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
> -MODULE_DESCRIPTION("LM3533 Ambient Light Sensor driver");
> -MODULE_LICENSE("GPL");
> -MODULE_ALIAS("platform:lm3533-als");

On Sat, Jun 01, 2024 at 02:05:08PM +0100, Jonathan Cameron wrote:
> On Fri, 31 May 2024 19:56:14 +0300
> Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote:
> 
> > The driver has no in kernel users and requires a board file
> > to be instantiated. Remove basically a dead code.
> > 
> > If ever needed, it can be reinstantiated and converted to one
> > that uses firmware node interfaces.
> > 
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Given the header removal in patch 4, I assume these all need to go together
> via mfd.
> 
> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Thank you! We are waiting for Johan to tell what his plans about the driver.
If it comes to removal, I add your tag to the new version of this mini-series.