/*
* IIO driver for the light sensor ISL29028.
* ISL29028 is Concurrent Ambient Light and Proximity Sensor
*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define CONVERSION_TIME_MS 100
#define ISL29028_REG_CONFIGURE 0x01
#define CONFIGURE_ALS_IR_MODE_ALS 0
#define CONFIGURE_ALS_IR_MODE_IR BIT(0)
#define CONFIGURE_ALS_IR_MODE_MASK BIT(0)
#define CONFIGURE_ALS_RANGE_LOW_LUX 0
#define CONFIGURE_ALS_RANGE_HIGH_LUX BIT(1)
#define CONFIGURE_ALS_RANGE_MASK BIT(1)
#define CONFIGURE_ALS_DIS 0
#define CONFIGURE_ALS_EN BIT(2)
#define CONFIGURE_ALS_EN_MASK BIT(2)
#define CONFIGURE_PROX_DRIVE BIT(3)
#define CONFIGURE_PROX_SLP_SH 4
#define CONFIGURE_PROX_SLP_MASK (7 << CONFIGURE_PROX_SLP_SH)
#define CONFIGURE_PROX_EN BIT(7)
#define CONFIGURE_PROX_EN_MASK BIT(7)
#define ISL29028_REG_INTERRUPT 0x02
#define ISL29028_REG_PROX_DATA 0x08
#define ISL29028_REG_ALSIR_L 0x09
#define ISL29028_REG_ALSIR_U 0x0A
#define ISL29028_REG_TEST1_MODE 0x0E
#define ISL29028_REG_TEST2_MODE 0x0F
#define ISL29028_NUM_REGS (ISL29028_REG_TEST2_MODE + 1)
enum als_ir_mode {
MODE_NONE = 0,
MODE_ALS,
MODE_IR
};
struct isl29028_chip {
struct device *dev;
struct mutex lock;
struct regmap *regmap;
unsigned int prox_sampling;
bool enable_prox;
int lux_scale;
int als_ir_mode;
};
static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
unsigned int sampling)
{
static unsigned int prox_period[] = {800, 400, 200, 100, 75, 50, 12, 0};
int sel;
unsigned int period = DIV_ROUND_UP(1000, sampling);
for (sel = 0; sel < ARRAY_SIZE(prox_period); ++sel) {
if (period >= prox_period[sel])
break;
}
return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
CONFIGURE_PROX_SLP_MASK, sel << CONFIGURE_PROX_SLP_SH);
}
static int isl29028_enable_proximity(struct isl29028_chip *chip, bool enable)
{
int ret;
int val = 0;
if (enable)
val = CONFIGURE_PROX_EN;
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
CONFIGURE_PROX_EN_MASK, val);
if (ret < 0)
return ret;
/* Wait for conversion to be complete for first sample */
mdelay(DIV_ROUND_UP(1000, chip->prox_sampling));
return 0;
}
static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
{
int val = (lux_scale == 2000) ? CONFIGURE_ALS_RANGE_HIGH_LUX :
CONFIGURE_ALS_RANGE_LOW_LUX;
return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
CONFIGURE_ALS_RANGE_MASK, val);
}
static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
enum als_ir_mode mode)
{
int ret = 0;
switch (mode) {
case MODE_ALS:
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_ALS);
if (ret < 0)
return ret;
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
CONFIGURE_ALS_RANGE_MASK, CONFIGURE_ALS_RANGE_HIGH_LUX);
break;
case MODE_IR:
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_IR);
break;
case MODE_NONE:
return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_DIS);
}
if (ret < 0)
return ret;
/* Enable the ALS/IR */
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_EN);
if (ret < 0)
return ret;
/* Need to wait for conversion time if ALS/IR mode enabled */
mdelay(CONVERSION_TIME_MS);
return 0;
}
static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
{
unsigned int lsb;
unsigned int msb;
int ret;
ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
if (ret < 0) {
dev_err(chip->dev,
"Error in reading register ALSIR_L err %d\n", ret);
return ret;
}
ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
if (ret < 0) {
dev_err(chip->dev,
"Error in reading register ALSIR_U err %d\n", ret);
return ret;
}
*als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
return 0;
}
static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
{
unsigned int data;
int ret;
ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
if (ret < 0) {
dev_err(chip->dev, "Error in reading register %d, error %d\n",
ISL29028_REG_PROX_DATA, ret);
return ret;
}
*prox = data;
return 0;
}
static int isl29028_proxim_get(struct isl29028_chip *chip, int *prox_data)
{
int ret;
if (!chip->enable_prox) {
ret = isl29028_enable_proximity(chip, true);
if (ret < 0)
return ret;
chip->enable_prox = true;
}
return isl29028_read_proxim(chip, prox_data);
}
static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
{
int ret;
int als_ir_data;
if (chip->als_ir_mode != MODE_ALS) {
ret = isl29028_set_als_ir_mode(chip, MODE_ALS);
if (ret < 0) {
dev_err(chip->dev,
"Error in enabling ALS mode err %d\n", ret);
return ret;
}
chip->als_ir_mode = MODE_ALS;
}
ret = isl29028_read_als_ir(chip, &als_ir_data);
if (ret < 0)
return ret;
/*
* convert als data count to lux.
* if lux_scale = 125, lux = count * 0.031
* if lux_scale = 2000, lux = count * 0.49
*/
if (chip->lux_scale == 125)
als_ir_data = (als_ir_data * 31) / 1000;
else
als_ir_data = (als_ir_data * 49) / 100;
*als_data = als_ir_data;
return 0;
}
static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
{
int ret;
if (chip->als_ir_mode != MODE_IR) {
ret = isl29028_set_als_ir_mode(chip, MODE_IR);
if (ret < 0) {
dev_err(chip->dev,
"Error in enabling IR mode err %d\n", ret);
return ret;
}
chip->als_ir_mode = MODE_IR;
}
return isl29028_read_als_ir(chip, ir_data);
}
/* Channel IO */
static int isl29028_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val, int val2, long mask)
{
struct isl29028_chip *chip = iio_priv(indio_dev);
int ret = -EINVAL;
mutex_lock(&chip->lock);
switch (chan->type) {
case IIO_PROXIMITY:
if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
dev_err(chip->dev,
"proximity: mask value 0x%08lx not supported\n",
mask);
break;
}
if (val < 1 || val > 100) {
dev_err(chip->dev,
"Samp_freq %d is not in range[1:100]\n", val);
break;
}
ret = isl29028_set_proxim_sampling(chip, val);
if (ret < 0) {
dev_err(chip->dev,
"Setting proximity samp_freq fail, err %d\n",
ret);
break;
}
chip->prox_sampling = val;
break;
case IIO_LIGHT:
if (mask != IIO_CHAN_INFO_SCALE) {
dev_err(chip->dev,
"light: mask value 0x%08lx not supported\n",
mask);
break;
}
if ((val != 125) && (val != 2000)) {
dev_err(chip->dev,
"lux scale %d is invalid [125, 2000]\n", val);
break;
}
ret = isl29028_set_als_scale(chip, val);
if (ret < 0) {
dev_err(chip->dev,
"Setting lux scale fail with error %d\n", ret);
break;
}
chip->lux_scale = val;
break;
default:
dev_err(chip->dev, "Unsupported channel type\n");
break;
}
mutex_unlock(&chip->lock);
return ret;
}
static int isl29028_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val, int *val2, long mask)
{
struct isl29028_chip *chip = iio_priv(indio_dev);
int ret = -EINVAL;
mutex_lock(&chip->lock);
switch (mask) {
case IIO_CHAN_INFO_RAW:
case IIO_CHAN_INFO_PROCESSED:
switch (chan->type) {
case IIO_LIGHT:
ret = isl29028_als_get(chip, val);
break;
case IIO_INTENSITY:
ret = isl29028_ir_get(chip, val);
break;
case IIO_PROXIMITY:
ret = isl29028_proxim_get(chip, val);
break;
default:
break;
}
if (ret < 0)
break;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SAMP_FREQ:
if (chan->type != IIO_PROXIMITY)
break;
*val = chip->prox_sampling;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
if (chan->type != IIO_LIGHT)
break;
*val = chip->lux_scale;
ret = IIO_VAL_INT;
break;
default:
dev_err(chip->dev, "mask value 0x%08lx not supported\n", mask);
break;
}
mutex_unlock(&chip->lock);
return ret;
}
static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
"1, 3, 5, 10, 13, 20, 83, 100");
static IIO_CONST_ATTR(in_illuminance_scale_available, "125, 2000");
#define ISL29028_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
#define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
static struct attribute *isl29028_attributes[] = {
ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
ISL29028_CONST_ATTR(in_illuminance_scale_available),
NULL,
};
static const struct attribute_group isl29108_group = {
.attrs = isl29028_attributes,
};
static const struct iio_chan_spec isl29028_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
BIT(IIO_CHAN_INFO_SCALE),
}, {
.type = IIO_INTENSITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
}, {
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SAMP_FREQ),
}
};
static const struct iio_info isl29028_info = {
.attrs = &isl29108_group,
.driver_module = THIS_MODULE,
.read_raw = isl29028_read_raw,
.write_raw = isl29028_write_raw,
};
static int isl29028_chip_init(struct isl29028_chip *chip)
{
int ret;
chip->enable_prox = false;
chip->prox_sampling = 20;
chip->lux_scale = 2000;
chip->als_ir_mode = MODE_NONE;
ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
if (ret < 0) {
dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n",
__func__, ISL29028_REG_TEST1_MODE, ret);
return ret;
}
ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
if (ret < 0) {
dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n",
__func__, ISL29028_REG_TEST2_MODE, ret);
return ret;
}
ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
if (ret < 0) {
dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n",
__func__, ISL29028_REG_CONFIGURE, ret);
return ret;
}
ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling);
if (ret < 0) {
dev_err(chip->dev, "setting the proximity, err = %d\n",
ret);
return ret;
}
ret = isl29028_set_als_scale(chip, chip->lux_scale);
if (ret < 0)
dev_err(chip->dev,
"setting als scale failed, err = %d\n", ret);
return ret;
}
static bool is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case ISL29028_REG_INTERRUPT:
case ISL29028_REG_PROX_DATA:
case ISL29028_REG_ALSIR_L:
case ISL29028_REG_ALSIR_U:
return true;
default:
return false;
}
}
static const struct regmap_config isl29028_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = is_volatile_reg,
.max_register = ISL29028_NUM_REGS - 1,
.num_reg_defaults_raw = ISL29028_NUM_REGS,
.cache_type = REGCACHE_RBTREE,
};
static int isl29028_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct isl29028_chip *chip;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
if (!indio_dev) {
dev_err(&client->dev, "iio allocation fails\n");
return -ENOMEM;
}
chip = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
chip->dev = &client->dev;
mutex_init(&chip->lock);
chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
if (IS_ERR(chip->regmap)) {
ret = PTR_ERR(chip->regmap);
dev_err(chip->dev, "regmap initialization failed: %d\n", ret);
return ret;
}
ret = isl29028_chip_init(chip);
if (ret < 0) {
dev_err(chip->dev, "chip initialization failed: %d\n", ret);
return ret;
}
indio_dev->info = &isl29028_info;
indio_dev->channels = isl29028_channels;
indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
indio_dev->name = id->name;
indio_dev->dev.parent = &client->dev;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
if (ret < 0) {
dev_err(chip->dev, "iio registration fails with error %d\n",
ret);
return ret;
}
return 0;
}
static const struct i2c_device_id isl29028_id[] = {
{"isl29028", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, isl29028_id);
static const struct of_device_id isl29028_of_match[] = {
{ .compatible = "isl,isl29028", }, /* for backward compat., don't use */
{ .compatible = "isil,isl29028", },
{ },
};
MODULE_DEVICE_TABLE(of, isl29028_of_match);
static struct i2c_driver isl29028_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "isl29028",
.of_match_table = isl29028_of_match,
},
.probe = isl29028_probe,
.id_table = isl29028_id,
};
module_i2c_driver(isl29028_driver);
MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Laxman Dewangan ");