Release 4.7 drivers/iio/light/rpr0521.c

Directory: drivers/iio/light
/*
 * RPR-0521 ROHM Ambient Light and Proximity Sensor
 *
 * Copyright (c) 2015, 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.
 *
 * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).
 *
 * TODO: illuminance channel, PM support, buffer
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/delay.h>
#include <linux/acpi.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/pm_runtime.h>


#define RPR0521_REG_SYSTEM_CTRL		0x40

#define RPR0521_REG_MODE_CTRL		0x41

#define RPR0521_REG_ALS_CTRL		0x42

#define RPR0521_REG_PXS_CTRL		0x43

#define RPR0521_REG_PXS_DATA		0x44 
/* 16-bit, little endian */

#define RPR0521_REG_ALS_DATA0		0x46 
/* 16-bit, little endian */

#define RPR0521_REG_ALS_DATA1		0x48 
/* 16-bit, little endian */

#define RPR0521_REG_ID			0x92


#define RPR0521_MODE_ALS_MASK		BIT(7)

#define RPR0521_MODE_PXS_MASK		BIT(6)

#define RPR0521_MODE_MEAS_TIME_MASK	GENMASK(3, 0)

#define RPR0521_ALS_DATA0_GAIN_MASK	GENMASK(5, 4)

#define RPR0521_ALS_DATA0_GAIN_SHIFT	4

#define RPR0521_ALS_DATA1_GAIN_MASK	GENMASK(3, 2)

#define RPR0521_ALS_DATA1_GAIN_SHIFT	2

#define RPR0521_PXS_GAIN_MASK		GENMASK(5, 4)

#define RPR0521_PXS_GAIN_SHIFT		4


#define RPR0521_MODE_ALS_ENABLE		BIT(7)

#define RPR0521_MODE_ALS_DISABLE	0x00

#define RPR0521_MODE_PXS_ENABLE		BIT(6)

#define RPR0521_MODE_PXS_DISABLE	0x00


#define RPR0521_MANUFACT_ID		0xE0

#define RPR0521_DEFAULT_MEAS_TIME	0x06 
/* ALS - 100ms, PXS - 100ms */


#define RPR0521_DRV_NAME		"RPR0521"

#define RPR0521_REGMAP_NAME		"rpr0521_regmap"


#define RPR0521_SLEEP_DELAY_MS	2000


#define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"

#define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"


struct rpr0521_gain {
	
int scale;
	
int uscale;
};


static const struct rpr0521_gain rpr0521_als_gain[4] = {
	{1, 0},		/* x1 */
	{0, 500000},	/* x2 */
	{0, 15625},	/* x64 */
	{0, 7812},	/* x128 */
};


static const struct rpr0521_gain rpr0521_pxs_gain[3] = {
	{1, 0},		/* x1 */
	{0, 500000},	/* x2 */
	{0, 125000},	/* x4 */
};


enum rpr0521_channel {
	
RPR0521_CHAN_ALS_DATA0,
	
RPR0521_CHAN_ALS_DATA1,
	
RPR0521_CHAN_PXS,
};


struct rpr0521_reg_desc {
	
u8 address;
	
u8 device_mask;
};


static const struct rpr0521_reg_desc rpr0521_data_reg[] = {
	[RPR0521_CHAN_ALS_DATA0] = {
		.address	= RPR0521_REG_ALS_DATA0,
		.device_mask	= RPR0521_MODE_ALS_MASK,
        },
	[RPR0521_CHAN_ALS_DATA1] = {
		.address	= RPR0521_REG_ALS_DATA1,
		.device_mask	= RPR0521_MODE_ALS_MASK,
        },
	[RPR0521_CHAN_PXS]	= {
		.address	= RPR0521_REG_PXS_DATA,
		.device_mask	= RPR0521_MODE_PXS_MASK,
        },
};


static const struct rpr0521_gain_info {
	
u8 reg;
	
u8 mask;
	
u8 shift;
	
const struct rpr0521_gain *gain;
	
int size;
} 
rpr0521_gain[] = {
	[RPR0521_CHAN_ALS_DATA0] = {
		.reg	= RPR0521_REG_ALS_CTRL,
		.mask	= RPR0521_ALS_DATA0_GAIN_MASK,
		.shift	= RPR0521_ALS_DATA0_GAIN_SHIFT,
		.gain	= rpr0521_als_gain,
		.size	= ARRAY_SIZE(rpr0521_als_gain),
        },
	[RPR0521_CHAN_ALS_DATA1] = {
		.reg	= RPR0521_REG_ALS_CTRL,
		.mask	= RPR0521_ALS_DATA1_GAIN_MASK,
		.shift	= RPR0521_ALS_DATA1_GAIN_SHIFT,
		.gain	= rpr0521_als_gain,
		.size	= ARRAY_SIZE(rpr0521_als_gain),
        },
	[RPR0521_CHAN_PXS] = {
		.reg	= RPR0521_REG_PXS_CTRL,
		.mask	= RPR0521_PXS_GAIN_MASK,
		.shift	= RPR0521_PXS_GAIN_SHIFT,
		.gain	= rpr0521_pxs_gain,
		.size	= ARRAY_SIZE(rpr0521_pxs_gain),
        },
};


struct rpr0521_data {
	
struct i2c_client *client;

	/* protect device params updates (e.g state, gain) */
	
struct mutex lock;

	/* device active status */
	
bool als_dev_en;
	
bool pxs_dev_en;

	/* optimize runtime pm ops - enable device only if needed */
	
bool als_ps_need_en;
	
bool pxs_ps_need_en;

	
struct regmap *regmap;
};

static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);
static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);


static struct attribute *rpr0521_attributes[] = {
	&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
	NULL,
};


static const struct attribute_group rpr0521_attribute_group = {
	.attrs = rpr0521_attributes,
};


static const struct iio_chan_spec rpr0521_channels[] = {
	{
		.type = IIO_INTENSITY,
		.modified = 1,
		.address = RPR0521_CHAN_ALS_DATA0,
		.channel2 = IIO_MOD_LIGHT_BOTH,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
        },
	{
		.type = IIO_INTENSITY,
		.modified = 1,
		.address = RPR0521_CHAN_ALS_DATA1,
		.channel2 = IIO_MOD_LIGHT_IR,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
        },
	{
		.type = IIO_PROXIMITY,
		.address = RPR0521_CHAN_PXS,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
        }
};



static int rpr0521_als_enable(struct rpr0521_data *data, u8 status)
{
	int ret;

	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
				 RPR0521_MODE_ALS_MASK,
				 status);
	if (ret < 0)
		return ret;

	data->als_dev_en = true;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%



static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status)
{
	int ret;

	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
				 RPR0521_MODE_PXS_MASK,
				 status);
	if (ret < 0)
		return ret;

	data->pxs_dev_en = true;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%

/**
 * rpr0521_set_power_state - handles runtime PM state and sensors enabled status
 *
 * @data: rpr0521 device private data
 * @on: state to be set for devices in @device_mask
 * @device_mask: bitmask specifying for which device we need to update @on state
 *
 * We rely on rpr0521_runtime_resume to enable our @device_mask devices, but
 * if (for example) PXS was enabled (pxs_dev_en = true) by a previous call to
 * rpr0521_runtime_resume and we want to enable ALS we MUST set ALS enable
 * bit of RPR0521_REG_MODE_CTRL here because rpr0521_runtime_resume will not
 * be called twice.
 */


static int rpr0521_set_power_state(struct rpr0521_data *data, bool on,
				   u8 device_mask)
{
#ifdef CONFIG_PM
	int ret;
	u8 update_mask = 0;

	if (device_mask & RPR0521_MODE_ALS_MASK) {
		if (on && !data->als_ps_need_en && data->pxs_dev_en)
			update_mask |= RPR0521_MODE_ALS_MASK;
		else
			data->als_ps_need_en = on;
	}

	if (device_mask & RPR0521_MODE_PXS_MASK) {
		if (on && !data->pxs_ps_need_en && data->als_dev_en)
			update_mask |= RPR0521_MODE_PXS_MASK;
		else
			data->pxs_ps_need_en = on;
	}

	if (update_mask) {
		ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
					 update_mask, update_mask);
		if (ret < 0)
			return ret;
	}

	if (on) {
		ret = pm_runtime_get_sync(&data->client->dev);
	} else {
		pm_runtime_mark_last_busy(&data->client->dev);
		ret = pm_runtime_put_autosuspend(&data->client->dev);
	}
	if (ret < 0) {
		dev_err(&data->client->dev,
			"Failed: rpr0521_set_power_state for %d, ret %d\n",
			on, ret);
		if (on)
			pm_runtime_put_noidle(&data->client->dev);

		return ret;
	}
#endif
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 211 100.00% 1 100.00%
Total 211 100.00% 1 100.00%



static int rpr0521_get_gain(struct rpr0521_data *data, int chan,
			    int *val, int *val2)
{
	int ret, reg, idx;

	ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, &reg);
	if (ret < 0)
		return ret;

	idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift;
	*val = rpr0521_gain[chan].gain[idx].scale;
	*val2 = rpr0521_gain[chan].gain[idx].uscale;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 110 100.00% 1 100.00%
Total 110 100.00% 1 100.00%



static int rpr0521_set_gain(struct rpr0521_data *data, int chan,
			    int val, int val2)
{
	int i, idx = -EINVAL;

	/* get gain index */
	for (i = 0; i < rpr0521_gain[chan].size; i++)
		if (val == rpr0521_gain[chan].gain[i].scale &&
		    val2 == rpr0521_gain[chan].gain[i].uscale) {
			idx = i;
			break;
		}

	if (idx < 0)
		return idx;

	return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg,
				  rpr0521_gain[chan].mask,
				  idx << rpr0521_gain[chan].shift);
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 124 100.00% 1 100.00%
Total 124 100.00% 1 100.00%



static int rpr0521_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan, int *val,
			    int *val2, long mask)
{
	struct rpr0521_data *data = iio_priv(indio_dev);
	int ret;
	u8 device_mask;
	__le16 raw_data;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY)
			return -EINVAL;

		device_mask = rpr0521_data_reg[chan->address].device_mask;

		mutex_lock(&data->lock);
		ret = rpr0521_set_power_state(data, true, device_mask);
		if (ret < 0) {
			mutex_unlock(&data->lock);
			return ret;
		}

		ret = regmap_bulk_read(data->regmap,
				       rpr0521_data_reg[chan->address].address,
				       &raw_data, 2);
		if (ret < 0) {
			rpr0521_set_power_state(data, false, device_mask);
			mutex_unlock(&data->lock);
			return ret;
		}

		ret = rpr0521_set_power_state(data, false, device_mask);
		mutex_unlock(&data->lock);
		if (ret < 0)
			return ret;

		*val = le16_to_cpu(raw_data);

		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		mutex_lock(&data->lock);
		ret = rpr0521_get_gain(data, chan->address, val, val2);
		mutex_unlock(&data->lock);
		if (ret < 0)
			return ret;

		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 264 100.00% 1 100.00%
Total 264 100.00% 1 100.00%



static int rpr0521_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan, int val,
			     int val2, long mask)
{
	struct rpr0521_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		mutex_lock(&data->lock);
		ret = rpr0521_set_gain(data, chan->address, val, val2);
		mutex_unlock(&data->lock);

		return ret;
	default:
		return -EINVAL;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 87 100.00% 1 100.00%
Total 87 100.00% 1 100.00%


static const struct iio_info rpr0521_info = {
	.driver_module	= THIS_MODULE,
	.read_raw	= rpr0521_read_raw,
	.write_raw	= rpr0521_write_raw,
	.attrs		= &rpr0521_attribute_group,
};



static int rpr0521_init(struct rpr0521_data *data)
{
	int ret;
	int id;

	ret = regmap_read(data->regmap, RPR0521_REG_ID, &id);
	if (ret < 0) {
		dev_err(&data->client->dev, "Failed to read REG_ID register\n");
		return ret;
	}

	if (id != RPR0521_MANUFACT_ID) {
		dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
			id, RPR0521_MANUFACT_ID);
		return -ENODEV;
	}

	/* set default measurement time - 100 ms for both ALS and PS */
	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
				 RPR0521_MODE_MEAS_TIME_MASK,
				 RPR0521_DEFAULT_MEAS_TIME);
	if (ret) {
		pr_err("regmap_update_bits returned %d\n", ret);
		return ret;
	}

	ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
	if (ret < 0)
		return ret;
	ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
	if (ret < 0)
		return ret;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 153 100.00% 1 100.00%
Total 153 100.00% 1 100.00%



static int rpr0521_poweroff(struct rpr0521_data *data)
{
	int ret;

	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
				 RPR0521_MODE_ALS_MASK |
				 RPR0521_MODE_PXS_MASK,
				 RPR0521_MODE_ALS_DISABLE |
				 RPR0521_MODE_PXS_DISABLE);
	if (ret < 0)
		return ret;

	data->als_dev_en = false;
	data->pxs_dev_en = false;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 57 100.00% 1 100.00%
Total 57 100.00% 1 100.00%



static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case RPR0521_REG_MODE_CTRL:
	case RPR0521_REG_ALS_CTRL:
	case RPR0521_REG_PXS_CTRL:
		return false;
	default:
		return true;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%


static const struct regmap_config rpr0521_regmap_config = {
	.name		= RPR0521_REGMAP_NAME,

	.reg_bits	= 8,
	.val_bits	= 8,

	.max_register	= RPR0521_REG_ID,
	.cache_type	= REGCACHE_RBTREE,
	.volatile_reg	= rpr0521_is_volatile_reg,
};



static int rpr0521_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct rpr0521_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, &rpr0521_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 = &rpr0521_info;
	indio_dev->name = RPR0521_DRV_NAME;
	indio_dev->channels = rpr0521_channels;
	indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = rpr0521_init(data);
	if (ret < 0) {
		dev_err(&client->dev, "rpr0521 chip init failed\n");
		return ret;
	}

	ret = pm_runtime_set_active(&client->dev);
	if (ret < 0)
		return ret;

	pm_runtime_enable(&client->dev);
	pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS);
	pm_runtime_use_autosuspend(&client->dev);

	return iio_device_register(indio_dev);
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 249 98.42% 1 50.00%
adriana reus adriana reus 4 1.58% 1 50.00%
Total 253 100.00% 2 100.00%



static int rpr0521_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);

	rpr0521_poweroff(iio_priv(indio_dev));

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 56 91.80% 1 50.00%
adriana reus adriana reus 5 8.20% 1 50.00%
Total 61 100.00% 2 100.00%

#ifdef CONFIG_PM


static int rpr0521_runtime_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct rpr0521_data *data = iio_priv(indio_dev);
	int ret;

	/* disable channels and sets {als,pxs}_dev_en to false */
	mutex_lock(&data->lock);
	ret = rpr0521_poweroff(data);
	mutex_unlock(&data->lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 64 100.00% 1 100.00%
Total 64 100.00% 1 100.00%



static int rpr0521_runtime_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct rpr0521_data *data = iio_priv(indio_dev);
	int ret;

	if (data->als_ps_need_en) {
		ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
		if (ret < 0)
			return ret;
		data->als_ps_need_en = false;
	}

	if (data->pxs_ps_need_en) {
		ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
		if (ret < 0)
			return ret;
		data->pxs_ps_need_en = false;
	}

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 104 100.00% 1 100.00%
Total 104 100.00% 1 100.00%

#endif


static const struct dev_pm_ops rpr0521_pm_ops = {
	SET_RUNTIME_PM_OPS(rpr0521_runtime_suspend,
			   rpr0521_runtime_resume, NULL)
};


static const struct acpi_device_id rpr0521_acpi_match[] = {
	{"RPR0521", 0},
	{ }
};
MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match);


static const struct i2c_device_id rpr0521_id[] = {
	{"rpr0521", 0},
	{ }
};

MODULE_DEVICE_TABLE(i2c, rpr0521_id);


static struct i2c_driver rpr0521_driver = {
	.driver = {
		.name	= RPR0521_DRV_NAME,
		.pm	= &rpr0521_pm_ops,
		.acpi_match_table = ACPI_PTR(rpr0521_acpi_match),
        },
	.probe		= rpr0521_probe,
	.remove		= rpr0521_remove,
	.id_table	= rpr0521_id,
};


module_i2c_driver(rpr0521_driver);

MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");
MODULE_LICENSE("GPL v2");
Overall Contributors
Person Tokens Prop Commits CommitProp
daniel baluta daniel baluta 2449 99.63% 1 50.00%
adriana reus adriana reus 9 0.37% 1 50.00%
Total 2458 100.00% 2 100.00%
  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
daniel baluta	daniel baluta	50	100.00%	1	100.00%
	Total	50	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/iio/light/rpr0521.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
