Release 4.8 drivers/iio/light/max44000.c

Directory: drivers/iio/light
/*
 * MAX44000 Ambient and Infrared Proximity Sensor
 *
 * Copyright (c) 2016, Intel Corporation.
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License.  See the file COPYING in the main
 * directory of this archive for more details.
 *
 * Data sheet: https://datasheets.maximintegrated.com/en/ds/MAX44000.pdf
 *
 * 7-bit I2C slave address 0x4a
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/util_macros.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/acpi.h>


#define MAX44000_DRV_NAME		"max44000"

/* Registers in datasheet order */

#define MAX44000_REG_STATUS		0x00

#define MAX44000_REG_CFG_MAIN		0x01

#define MAX44000_REG_CFG_RX		0x02

#define MAX44000_REG_CFG_TX		0x03

#define MAX44000_REG_ALS_DATA_HI	0x04

#define MAX44000_REG_ALS_DATA_LO	0x05

#define MAX44000_REG_PRX_DATA		0x16

#define MAX44000_REG_ALS_UPTHR_HI	0x06

#define MAX44000_REG_ALS_UPTHR_LO	0x07

#define MAX44000_REG_ALS_LOTHR_HI	0x08

#define MAX44000_REG_ALS_LOTHR_LO	0x09

#define MAX44000_REG_PST		0x0a

#define MAX44000_REG_PRX_IND		0x0b

#define MAX44000_REG_PRX_THR		0x0c

#define MAX44000_REG_TRIM_GAIN_GREEN	0x0f

#define MAX44000_REG_TRIM_GAIN_IR	0x10

/* REG_CFG bits */

#define MAX44000_CFG_ALSINTE            0x01

#define MAX44000_CFG_PRXINTE            0x02

#define MAX44000_CFG_MASK               0x1c

#define MAX44000_CFG_MODE_SHUTDOWN      0x00

#define MAX44000_CFG_MODE_ALS_GIR       0x04

#define MAX44000_CFG_MODE_ALS_G         0x08

#define MAX44000_CFG_MODE_ALS_IR        0x0c

#define MAX44000_CFG_MODE_ALS_PRX       0x10

#define MAX44000_CFG_MODE_PRX           0x14

#define MAX44000_CFG_TRIM               0x20

/*
 * Upper 4 bits are not documented but start as 1 on powerup
 * Setting them to 0 causes proximity to misbehave so set them to 1
 */

#define MAX44000_REG_CFG_RX_DEFAULT 0xf0

/* REG_RX bits */

#define MAX44000_CFG_RX_ALSTIM_MASK	0x0c

#define MAX44000_CFG_RX_ALSTIM_SHIFT	2

#define MAX44000_CFG_RX_ALSPGA_MASK	0x03

#define MAX44000_CFG_RX_ALSPGA_SHIFT	0

/* REG_TX bits */

#define MAX44000_LED_CURRENT_MASK	0xf

#define MAX44000_LED_CURRENT_MAX	11

#define MAX44000_LED_CURRENT_DEFAULT	6


#define MAX44000_ALSDATA_OVERFLOW	0x4000


struct max44000_data {
	
struct mutex lock;
	
struct regmap *regmap;
};

/* Default scale is set to the minimum of 0.03125 or 1 / (1 << 5) lux */

#define MAX44000_ALS_TO_LUX_DEFAULT_FRACTION_LOG2 5

/* Scale can be multiplied by up to 128x via ALSPGA for measurement gain */

static const int max44000_alspga_shift[] = {0, 2, 4, 7};

#define MAX44000_ALSPGA_MAX_SHIFT 7

/*
 * Scale can be multiplied by up to 64x via ALSTIM because of lost resolution
 *
 * This scaling factor is hidden from userspace and instead accounted for when
 * reading raw values from the device.
 *
 * This makes it possible to cleanly expose ALSPGA as IIO_CHAN_INFO_SCALE and
 * ALSTIM as IIO_CHAN_INFO_INT_TIME without the values affecting each other.
 *
 * Handling this internally is also required for buffer support because the
 * channel's scan_type can't be modified dynamically.
 */

static const int max44000_alstim_shift[] = {0, 2, 4, 6};

#define MAX44000_ALSTIM_SHIFT(alstim) (2 * (alstim))

/* Available integration times with pretty manual alignment: */

static const int max44000_int_time_avail_ns_array[] = {
	   100000000,
	    25000000,
	     6250000,
	     1562500,
};

static const char max44000_int_time_avail_str[] =
	"0.100 "
	"0.025 "
	"0.00625 "
	"0.001625";

/* Available scales (internal to ulux) with pretty manual alignment: */

static const int max44000_scale_avail_ulux_array[] = {
	    31250,
	   125000,
	   500000,
	  4000000,
};

static const char max44000_scale_avail_str[] =
	"0.03125 "
	"0.125 "
	"0.5 "
	 "4";


#define MAX44000_SCAN_INDEX_ALS 0

#define MAX44000_SCAN_INDEX_PRX 1


static const struct iio_chan_spec max44000_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
					    BIT(IIO_CHAN_INFO_INT_TIME),
		.scan_index = MAX44000_SCAN_INDEX_ALS,
		.scan_type = {
			.sign		= 'u',
			.realbits	= 14,
			.storagebits	= 16,
                }
	},
	{
		.type = IIO_PROXIMITY,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.scan_index = MAX44000_SCAN_INDEX_PRX,
		.scan_type = {
			.sign		= 'u',
			.realbits	= 8,
			.storagebits	= 16,
                }
	},
	IIO_CHAN_SOFT_TIMESTAMP(2),
	{
		.type = IIO_CURRENT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
				      BIT(IIO_CHAN_INFO_SCALE),
		.extend_name = "led",
		.output = 1,
		.scan_index = -1,
        },
};



static int max44000_read_alstim(struct max44000_data *data)
{
	unsigned int val;
	int ret;

	ret = regmap_read(data->regmap, MAX44000_REG_CFG_RX, &val);
	if (ret < 0)
		return ret;
	return (val & MAX44000_CFG_RX_ALSTIM_MASK) >> MAX44000_CFG_RX_ALSTIM_SHIFT;
}

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static int max44000_write_alstim(struct max44000_data *data, int val)
{
	return regmap_write_bits(data->regmap, MAX44000_REG_CFG_RX,
				 MAX44000_CFG_RX_ALSTIM_MASK,
				 val << MAX44000_CFG_RX_ALSTIM_SHIFT);
}

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static int max44000_read_alspga(struct max44000_data *data)
{
	unsigned int val;
	int ret;

	ret = regmap_read(data->regmap, MAX44000_REG_CFG_RX, &val);
	if (ret < 0)
		return ret;
	return (val & MAX44000_CFG_RX_ALSPGA_MASK) >> MAX44000_CFG_RX_ALSPGA_SHIFT;
}

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static int max44000_write_alspga(struct max44000_data *data, int val)
{
	return regmap_write_bits(data->regmap, MAX44000_REG_CFG_RX,
				 MAX44000_CFG_RX_ALSPGA_MASK,
				 val << MAX44000_CFG_RX_ALSPGA_SHIFT);
}

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static int max44000_read_alsval(struct max44000_data *data)
{
	u16 regval;
	int alstim, ret;

	ret = regmap_bulk_read(data->regmap, MAX44000_REG_ALS_DATA_HI,
			       &regval, sizeof(regval));
	if (ret < 0)
		return ret;
	alstim = ret = max44000_read_alstim(data);
	if (ret < 0)
		return ret;

	regval = be16_to_cpu(regval);

	/*
         * Overflow is explained on datasheet page 17.
         *
         * It's a warning that either the G or IR channel has become saturated
         * and that the value in the register is likely incorrect.
         *
         * The recommendation is to change the scale (ALSPGA).
         * The driver just returns the max representable value.
         */
	if (regval & MAX44000_ALSDATA_OVERFLOW)
		return 0x3FFF;

	return regval << MAX44000_ALSTIM_SHIFT(alstim);
}

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static int max44000_write_led_current_raw(struct max44000_data *data, int val)
{
	/* Maybe we should clamp the value instead? */
	if (val < 0 || val > MAX44000_LED_CURRENT_MAX)
		return -ERANGE;
	if (val >= 8)
		val += 4;
	return regmap_write_bits(data->regmap, MAX44000_REG_CFG_TX,
				 MAX44000_LED_CURRENT_MASK, val);
}

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static int max44000_read_led_current_raw(struct max44000_data *data)
{
	unsigned int regval;
	int ret;

	ret = regmap_read(data->regmap, MAX44000_REG_CFG_TX, &regval);
	if (ret < 0)
		return ret;
	regval &= MAX44000_LED_CURRENT_MASK;
	if (regval >= 8)
		regval -= 4;
	return regval;
}

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static int max44000_read_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int *val, int *val2, long mask)
{
	struct max44000_data *data = iio_priv(indio_dev);
	int alstim, alspga;
	unsigned int regval;
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		switch (chan->type) {
		case IIO_LIGHT:
			mutex_lock(&data->lock);
			ret = max44000_read_alsval(data);
			mutex_unlock(&data->lock);
			if (ret < 0)
				return ret;
			*val = ret;
			return IIO_VAL_INT;

		case IIO_PROXIMITY:
			mutex_lock(&data->lock);
			ret = regmap_read(data->regmap, MAX44000_REG_PRX_DATA, &regval);
			mutex_unlock(&data->lock);
			if (ret < 0)
				return ret;
			*val = regval;
			return IIO_VAL_INT;

		case IIO_CURRENT:
			mutex_lock(&data->lock);
			ret = max44000_read_led_current_raw(data);
			mutex_unlock(&data->lock);
			if (ret < 0)
				return ret;
			*val = ret;
			return IIO_VAL_INT;

		default:
			return -EINVAL;
		}

	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_CURRENT:
			/* Output register is in 10s of miliamps */
			*val = 10;
			return IIO_VAL_INT;

		case IIO_LIGHT:
			mutex_lock(&data->lock);
			alspga = ret = max44000_read_alspga(data);
			mutex_unlock(&data->lock);
			if (ret < 0)
				return ret;

			/* Avoid negative shifts */
			*val = (1 << MAX44000_ALSPGA_MAX_SHIFT);
			*val2 = MAX44000_ALS_TO_LUX_DEFAULT_FRACTION_LOG2
					+ MAX44000_ALSPGA_MAX_SHIFT
					- max44000_alspga_shift[alspga];
			return IIO_VAL_FRACTIONAL_LOG2;

		default:
			return -EINVAL;
		}

	case IIO_CHAN_INFO_INT_TIME:
		mutex_lock(&data->lock);
		alstim = ret = max44000_read_alstim(data);
		mutex_unlock(&data->lock);

		if (ret < 0)
			return ret;
		*val = 0;
		*val2 = max44000_int_time_avail_ns_array[alstim];
		return IIO_VAL_INT_PLUS_NANO;

	default:
		return -EINVAL;
	}
}

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static int max44000_write_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int val, int val2, long mask)
{
	struct max44000_data *data = iio_priv(indio_dev);
	int ret;

	if (mask == IIO_CHAN_INFO_RAW && chan->type == IIO_CURRENT) {
		mutex_lock(&data->lock);
		ret = max44000_write_led_current_raw(data, val);
		mutex_unlock(&data->lock);
		return ret;
	} else if (mask == IIO_CHAN_INFO_INT_TIME && chan->type == IIO_LIGHT) {
		s64 valns = val * NSEC_PER_SEC + val2;
		int alstim = find_closest_descending(valns,
				max44000_int_time_avail_ns_array,
				ARRAY_SIZE(max44000_int_time_avail_ns_array));
		mutex_lock(&data->lock);
		ret = max44000_write_alstim(data, alstim);
		mutex_unlock(&data->lock);
		return ret;
	} else if (mask == IIO_CHAN_INFO_SCALE && chan->type == IIO_LIGHT) {
		s64 valus = val * USEC_PER_SEC + val2;
		int alspga = find_closest(valus,
				max44000_scale_avail_ulux_array,
				ARRAY_SIZE(max44000_scale_avail_ulux_array));
		mutex_lock(&data->lock);
		ret = max44000_write_alspga(data, alspga);
		mutex_unlock(&data->lock);
		return ret;
	}

	return -EINVAL;
}

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static int max44000_write_raw_get_fmt(struct iio_dev *indio_dev,
				      struct iio_chan_spec const *chan,
				      long mask)
{
	if (mask == IIO_CHAN_INFO_INT_TIME && chan->type == IIO_LIGHT)
		return IIO_VAL_INT_PLUS_NANO;
	else if (mask == IIO_CHAN_INFO_SCALE && chan->type == IIO_LIGHT)
		return IIO_VAL_INT_PLUS_MICRO;
	else
		return IIO_VAL_INT;
}

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static IIO_CONST_ATTR(illuminance_integration_time_available, max44000_int_time_avail_str);
static IIO_CONST_ATTR(illuminance_scale_available, max44000_scale_avail_str);


static struct attribute *max44000_attributes[] = {
	&iio_const_attr_illuminance_integration_time_available.dev_attr.attr,
	&iio_const_attr_illuminance_scale_available.dev_attr.attr,
	NULL
};


static const struct attribute_group max44000_attribute_group = {
	.attrs = max44000_attributes,
};


static const struct iio_info max44000_info = {
	.driver_module		= THIS_MODULE,
	.read_raw		= max44000_read_raw,
	.write_raw		= max44000_write_raw,
	.write_raw_get_fmt	= max44000_write_raw_get_fmt,
	.attrs			= &max44000_attribute_group,
};



static bool max44000_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case MAX44000_REG_STATUS:
	case MAX44000_REG_CFG_MAIN:
	case MAX44000_REG_CFG_RX:
	case MAX44000_REG_CFG_TX:
	case MAX44000_REG_ALS_DATA_HI:
	case MAX44000_REG_ALS_DATA_LO:
	case MAX44000_REG_PRX_DATA:
	case MAX44000_REG_ALS_UPTHR_HI:
	case MAX44000_REG_ALS_UPTHR_LO:
	case MAX44000_REG_ALS_LOTHR_HI:
	case MAX44000_REG_ALS_LOTHR_LO:
	case MAX44000_REG_PST:
	case MAX44000_REG_PRX_IND:
	case MAX44000_REG_PRX_THR:
	case MAX44000_REG_TRIM_GAIN_GREEN:
	case MAX44000_REG_TRIM_GAIN_IR:
		return true;
	default:
		return false;
	}
}

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static bool max44000_writeable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case MAX44000_REG_CFG_MAIN:
	case MAX44000_REG_CFG_RX:
	case MAX44000_REG_CFG_TX:
	case MAX44000_REG_ALS_UPTHR_HI:
	case MAX44000_REG_ALS_UPTHR_LO:
	case MAX44000_REG_ALS_LOTHR_HI:
	case MAX44000_REG_ALS_LOTHR_LO:
	case MAX44000_REG_PST:
	case MAX44000_REG_PRX_IND:
	case MAX44000_REG_PRX_THR:
	case MAX44000_REG_TRIM_GAIN_GREEN:
	case MAX44000_REG_TRIM_GAIN_IR:
		return true;
	default:
		return false;
	}
}

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static bool max44000_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case MAX44000_REG_STATUS:
	case MAX44000_REG_ALS_DATA_HI:
	case MAX44000_REG_ALS_DATA_LO:
	case MAX44000_REG_PRX_DATA:
		return true;
	default:
		return false;
	}
}

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static bool max44000_precious_reg(struct device *dev, unsigned int reg)
{
	return reg == MAX44000_REG_STATUS;
}

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static const struct regmap_config max44000_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,

	.max_register	= MAX44000_REG_PRX_DATA,
	.readable_reg	= max44000_readable_reg,
	.writeable_reg	= max44000_writeable_reg,
	.volatile_reg	= max44000_volatile_reg,
	.precious_reg	= max44000_precious_reg,

	.use_single_rw	= 1,
	.cache_type	= REGCACHE_RBTREE,
};



static irqreturn_t max44000_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct max44000_data *data = iio_priv(indio_dev);
	u16 buf[8]; /* 2x u16 + padding + 8 bytes timestamp */
	int index = 0;
	unsigned int regval;
	int ret;

	mutex_lock(&data->lock);
	if (test_bit(MAX44000_SCAN_INDEX_ALS, indio_dev->active_scan_mask)) {
		ret = max44000_read_alsval(data);
		if (ret < 0)
			goto out_unlock;
		buf[index++] = ret;
	}
	if (test_bit(MAX44000_SCAN_INDEX_PRX, indio_dev->active_scan_mask)) {
		ret = regmap_read(data->regmap, MAX44000_REG_PRX_DATA, &regval);
		if (ret < 0)
			goto out_unlock;
		buf[index] = regval;
	}
	mutex_unlock(&data->lock);

	iio_push_to_buffers_with_timestamp(indio_dev, buf,
					   iio_get_time_ns(indio_dev));
	iio_trigger_notify_done(indio_dev->trig);
	return IRQ_HANDLED;

out_unlock:
	mutex_unlock(&data->lock);
	iio_trigger_notify_done(indio_dev->trig);
	return IRQ_HANDLED;
}

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static int max44000_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct max44000_data *data;
	struct iio_dev *indio_dev;
	int ret, reg;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;
	data = iio_priv(indio_dev);
	data->regmap = devm_regmap_init_i2c(client, &max44000_regmap_config);
	if (IS_ERR(data->regmap)) {
		dev_err(&client->dev, "regmap_init failed!\n");
		return PTR_ERR(data->regmap);
	}

	i2c_set_clientdata(client, indio_dev);
	mutex_init(&data->lock);
	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &max44000_info;
	indio_dev->name = MAX44000_DRV_NAME;
	indio_dev->channels = max44000_channels;
	indio_dev->num_channels = ARRAY_SIZE(max44000_channels);

	/*
         * The device doesn't have a reset function so we just clear some
         * important bits at probe time to ensure sane operation.
         *
         * Since we don't support interrupts/events the threshold values are
         * not important. We also don't touch trim values.
         */

	/* Reset ALS scaling bits */
	ret = regmap_write(data->regmap, MAX44000_REG_CFG_RX,
			   MAX44000_REG_CFG_RX_DEFAULT);
	if (ret < 0) {
		dev_err(&client->dev, "failed to write default CFG_RX: %d\n",
			ret);
		return ret;
	}

	/*
         * By default the LED pulse used for the proximity sensor is disabled.
         * Set a middle value so that we get some sort of valid data by default.
         */
	ret = max44000_write_led_current_raw(data, MAX44000_LED_CURRENT_DEFAULT);
	if (ret < 0) {
		dev_err(&client->dev, "failed to write init config: %d\n", ret);
		return ret;
	}

	/* Reset CFG bits to ALS_PRX mode which allows easy reading of both values. */
	reg = MAX44000_CFG_TRIM | MAX44000_CFG_MODE_ALS_PRX;
	ret = regmap_write(data->regmap, MAX44000_REG_CFG_MAIN, reg);
	if (ret < 0) {
		dev_err(&client->dev, "failed to write init config: %d\n", ret);
		return ret;
	}

	/* Read status at least once to clear any stale interrupt bits. */
	ret = regmap_read(data->regmap, MAX44000_REG_STATUS, &reg);
	if (ret < 0) {
		dev_err(&client->dev, "failed to read init status: %d\n", ret);
		return ret;
	}

	ret = iio_triggered_buffer_setup(indio_dev, NULL, max44000_trigger_handler, NULL);
	if (ret < 0) {
		dev_err(&client->dev, "iio triggered buffer setup failed\n");
		return ret;
	}

	return iio_device_register(indio_dev);
}

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static int max44000_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);

	return 0;
}

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Total 34 100.00% 2 100.00%


static const struct i2c_device_id max44000_id[] = {
	{"max44000", 0},
	{ }
};
MODULE_DEVICE_TABLE(i2c, max44000_id);

#ifdef CONFIG_ACPI

static const struct acpi_device_id max44000_acpi_match[] = {
	{"MAX44000", 0},
	{ }
};
MODULE_DEVICE_TABLE(acpi, max44000_acpi_match);
#endif


static struct i2c_driver max44000_driver = {
	.driver = {
		.name	= MAX44000_DRV_NAME,
		.acpi_match_table = ACPI_PTR(max44000_acpi_match),
        },
	.probe		= max44000_probe,
	.remove		= max44000_remove,
	.id_table	= max44000_id,
};


module_i2c_driver(max44000_driver);

MODULE_AUTHOR("Crestez Dan Leonard <leonard.crestez@intel.com>");
MODULE_DESCRIPTION("MAX44000 Ambient and Infrared Proximity Sensor");
MODULE_LICENSE("GPL v2");
Overall Contributors
Person Tokens Prop Commits CommitProp
crestez dan leonard crestez dan leonard 2477 99.88% 5 83.33%
gregor boirie gregor boirie 3 0.12% 1 16.67%
Total 2480 100.00% 6 100.00%
  Directory: drivers/iio/light

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
crestez dan leonard	crestez dan leonard	50	100.00%	2	100.00%
	Total	50	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.8 drivers/iio/light/max44000.c

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