iio: light: add support for ROHM BH1710/BH1715/BH1721/BH1750/BH1751 ambient light sensors
Add support for ROHM BH1710/BH1715/BH1721/BH1750/BH1751 ambient light sensors. Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Tomasz Duszynski
Jonathan Cameron
parent
54628687fa
commit
3a11fbb037
|
|
@ -37,6 +37,16 @@ config APDS9300
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called apds9300.
|
||||
|
||||
config BH1750
|
||||
tristate "ROHM BH1750 ambient light sensor"
|
||||
depends on I2C
|
||||
help
|
||||
Say Y here to build support for the ROHM BH1710, BH1715, BH1721,
|
||||
BH1750, BH1751 ambient light sensors.
|
||||
|
||||
To compile this driver as a module, choose M here: the module will
|
||||
be called bh1750.
|
||||
|
||||
config CM32181
|
||||
depends on I2C
|
||||
tristate "CM32181 driver"
|
||||
|
|
|
|||
|
|
@ -6,6 +6,7 @@
|
|||
obj-$(CONFIG_ADJD_S311) += adjd_s311.o
|
||||
obj-$(CONFIG_AL3320A) += al3320a.o
|
||||
obj-$(CONFIG_APDS9300) += apds9300.o
|
||||
obj-$(CONFIG_BH1750) += bh1750.o
|
||||
obj-$(CONFIG_CM32181) += cm32181.o
|
||||
obj-$(CONFIG_CM3232) += cm3232.o
|
||||
obj-$(CONFIG_CM3323) += cm3323.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,334 @@
|
|||
/*
|
||||
* ROHM BH1710/BH1715/BH1721/BH1750/BH1751 ambient light sensor driver
|
||||
*
|
||||
* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* Data sheets:
|
||||
* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1710fvc-e.pdf
|
||||
* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1715fvc-e.pdf
|
||||
* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1721fvc-e.pdf
|
||||
* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf
|
||||
* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1751fvi-e.pdf
|
||||
*
|
||||
* 7-bit I2C slave addresses:
|
||||
* 0x23 (ADDR pin low)
|
||||
* 0x5C (ADDR pin high)
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/delay.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/iio/sysfs.h>
|
||||
#include <linux/module.h>
|
||||
|
||||
#define BH1750_POWER_DOWN 0x00
|
||||
#define BH1750_ONE_TIME_H_RES_MODE 0x20 /* auto-mode for BH1721 */
|
||||
#define BH1750_CHANGE_INT_TIME_H_BIT 0x40
|
||||
#define BH1750_CHANGE_INT_TIME_L_BIT 0x60
|
||||
|
||||
enum {
|
||||
BH1710,
|
||||
BH1721,
|
||||
BH1750,
|
||||
};
|
||||
|
||||
struct bh1750_chip_info;
|
||||
struct bh1750_data {
|
||||
struct i2c_client *client;
|
||||
struct mutex lock;
|
||||
const struct bh1750_chip_info *chip_info;
|
||||
u16 mtreg;
|
||||
};
|
||||
|
||||
struct bh1750_chip_info {
|
||||
u16 mtreg_min;
|
||||
u16 mtreg_max;
|
||||
u16 mtreg_default;
|
||||
int mtreg_to_usec;
|
||||
int mtreg_to_scale;
|
||||
|
||||
/*
|
||||
* For BH1710/BH1721 all possible integration time values won't fit
|
||||
* into one page so displaying is limited to every second one.
|
||||
* Note, that user can still write proper values which were not
|
||||
* listed.
|
||||
*/
|
||||
int inc;
|
||||
|
||||
u16 int_time_low_mask;
|
||||
u16 int_time_high_mask;
|
||||
}
|
||||
|
||||
static const bh1750_chip_info_tbl[] = {
|
||||
[BH1710] = { 140, 1022, 300, 400, 250000000, 2, 0x001F, 0x03E0 },
|
||||
[BH1721] = { 140, 1020, 300, 400, 250000000, 2, 0x0010, 0x03E0 },
|
||||
[BH1750] = { 31, 254, 69, 1740, 57500000, 1, 0x001F, 0x00E0 },
|
||||
};
|
||||
|
||||
static int bh1750_change_int_time(struct bh1750_data *data, int usec)
|
||||
{
|
||||
int ret;
|
||||
u16 val;
|
||||
u8 regval;
|
||||
const struct bh1750_chip_info *chip_info = data->chip_info;
|
||||
|
||||
if ((usec % chip_info->mtreg_to_usec) != 0)
|
||||
return -EINVAL;
|
||||
|
||||
val = usec / chip_info->mtreg_to_usec;
|
||||
if (val < chip_info->mtreg_min || val > chip_info->mtreg_max)
|
||||
return -EINVAL;
|
||||
|
||||
ret = i2c_smbus_write_byte(data->client, BH1750_POWER_DOWN);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
regval = (val & chip_info->int_time_high_mask) >> 5;
|
||||
ret = i2c_smbus_write_byte(data->client,
|
||||
BH1750_CHANGE_INT_TIME_H_BIT | regval);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
regval = val & chip_info->int_time_low_mask;
|
||||
ret = i2c_smbus_write_byte(data->client,
|
||||
BH1750_CHANGE_INT_TIME_L_BIT | regval);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
data->mtreg = val;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bh1750_read(struct bh1750_data *data, int *val)
|
||||
{
|
||||
int ret;
|
||||
__be16 result;
|
||||
const struct bh1750_chip_info *chip_info = data->chip_info;
|
||||
unsigned long delay = chip_info->mtreg_to_usec * data->mtreg;
|
||||
|
||||
/*
|
||||
* BH1721 will enter continuous mode on receiving this command.
|
||||
* Note, that this eliminates need for bh1750_resume().
|
||||
*/
|
||||
ret = i2c_smbus_write_byte(data->client, BH1750_ONE_TIME_H_RES_MODE);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
usleep_range(delay + 15000, delay + 40000);
|
||||
|
||||
ret = i2c_master_recv(data->client, (char *)&result, 2);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
*val = be16_to_cpu(result);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bh1750_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int *val, int *val2, long mask)
|
||||
{
|
||||
int ret, tmp;
|
||||
struct bh1750_data *data = iio_priv(indio_dev);
|
||||
const struct bh1750_chip_info *chip_info = data->chip_info;
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
switch (chan->type) {
|
||||
case IIO_LIGHT:
|
||||
mutex_lock(&data->lock);
|
||||
ret = bh1750_read(data, val);
|
||||
mutex_unlock(&data->lock);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return IIO_VAL_INT;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
tmp = chip_info->mtreg_to_scale / data->mtreg;
|
||||
*val = tmp / 1000000;
|
||||
*val2 = tmp % 1000000;
|
||||
return IIO_VAL_INT_PLUS_MICRO;
|
||||
case IIO_CHAN_INFO_INT_TIME:
|
||||
*val = 0;
|
||||
*val2 = chip_info->mtreg_to_usec * data->mtreg;
|
||||
return IIO_VAL_INT_PLUS_MICRO;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int bh1750_write_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int val, int val2, long mask)
|
||||
{
|
||||
int ret;
|
||||
struct bh1750_data *data = iio_priv(indio_dev);
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_INT_TIME:
|
||||
if (val != 0)
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&data->lock);
|
||||
ret = bh1750_change_int_time(data, val2);
|
||||
mutex_unlock(&data->lock);
|
||||
return ret;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static ssize_t bh1750_show_int_time_available(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
int i;
|
||||
size_t len = 0;
|
||||
struct bh1750_data *data = iio_priv(dev_to_iio_dev(dev));
|
||||
const struct bh1750_chip_info *chip_info = data->chip_info;
|
||||
|
||||
for (i = chip_info->mtreg_min; i <= chip_info->mtreg_max; i += chip_info->inc)
|
||||
len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ",
|
||||
chip_info->mtreg_to_usec * i);
|
||||
|
||||
buf[len - 1] = '\n';
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static IIO_DEV_ATTR_INT_TIME_AVAIL(bh1750_show_int_time_available);
|
||||
|
||||
static struct attribute *bh1750_attributes[] = {
|
||||
&iio_dev_attr_integration_time_available.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute_group bh1750_attribute_group = {
|
||||
.attrs = bh1750_attributes,
|
||||
};
|
||||
|
||||
static const struct iio_info bh1750_info = {
|
||||
.driver_module = THIS_MODULE,
|
||||
.attrs = &bh1750_attribute_group,
|
||||
.read_raw = bh1750_read_raw,
|
||||
.write_raw = bh1750_write_raw,
|
||||
};
|
||||
|
||||
static const struct iio_chan_spec bh1750_channels[] = {
|
||||
{
|
||||
.type = IIO_LIGHT,
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
||||
BIT(IIO_CHAN_INFO_SCALE) |
|
||||
BIT(IIO_CHAN_INFO_INT_TIME)
|
||||
}
|
||||
};
|
||||
|
||||
static int bh1750_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
int ret, usec;
|
||||
struct bh1750_data *data;
|
||||
struct iio_dev *indio_dev;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
|
||||
I2C_FUNC_SMBUS_WRITE_BYTE))
|
||||
return -ENODEV;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
data = iio_priv(indio_dev);
|
||||
i2c_set_clientdata(client, indio_dev);
|
||||
data->client = client;
|
||||
data->chip_info = &bh1750_chip_info_tbl[id->driver_data];
|
||||
|
||||
usec = data->chip_info->mtreg_to_usec * data->chip_info->mtreg_default;
|
||||
ret = bh1750_change_int_time(data, usec);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
mutex_init(&data->lock);
|
||||
indio_dev->dev.parent = &client->dev;
|
||||
indio_dev->info = &bh1750_info;
|
||||
indio_dev->name = id->name;
|
||||
indio_dev->channels = bh1750_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(bh1750_channels);
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
|
||||
return iio_device_register(indio_dev);
|
||||
}
|
||||
|
||||
static int bh1750_remove(struct i2c_client *client)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
||||
struct bh1750_data *data = iio_priv(indio_dev);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
|
||||
mutex_lock(&data->lock);
|
||||
i2c_smbus_write_byte(client, BH1750_POWER_DOWN);
|
||||
mutex_unlock(&data->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static int bh1750_suspend(struct device *dev)
|
||||
{
|
||||
int ret;
|
||||
struct bh1750_data *data =
|
||||
iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
|
||||
|
||||
/*
|
||||
* This is mainly for BH1721 which doesn't enter power down
|
||||
* mode automatically.
|
||||
*/
|
||||
mutex_lock(&data->lock);
|
||||
ret = i2c_smbus_write_byte(data->client, BH1750_POWER_DOWN);
|
||||
mutex_unlock(&data->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(bh1750_pm_ops, bh1750_suspend, NULL);
|
||||
#define BH1750_PM_OPS (&bh1750_pm_ops)
|
||||
#else
|
||||
#define BH1750_PM_OPS NULL
|
||||
#endif
|
||||
|
||||
static const struct i2c_device_id bh1750_id[] = {
|
||||
{ "bh1710", BH1710 },
|
||||
{ "bh1715", BH1750 },
|
||||
{ "bh1721", BH1721 },
|
||||
{ "bh1750", BH1750 },
|
||||
{ "bh1751", BH1750 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, bh1750_id);
|
||||
|
||||
static struct i2c_driver bh1750_driver = {
|
||||
.driver = {
|
||||
.name = "bh1750",
|
||||
.owner = THIS_MODULE,
|
||||
.pm = BH1750_PM_OPS,
|
||||
},
|
||||
.probe = bh1750_probe,
|
||||
.remove = bh1750_remove,
|
||||
.id_table = bh1750_id,
|
||||
|
||||
};
|
||||
module_i2c_driver(bh1750_driver);
|
||||
|
||||
MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
|
||||
MODULE_DESCRIPTION("ROHM BH1710/BH1715/BH1721/BH1750/BH1751 als driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue