On Tue, Apr 21, 2015 at 9:43 PM, Tomasz Duszynski <tduszyns@xxxxxxxxx> wrote:
> Add support for ROHM BH1710/BH1715/BH1721/BH1750/BH1751 ambient light
> sensors.
>
> Signed-off-by: Tomasz Duszynski <tduszyns@xxxxxxxxx>
> ---
> drivers/iio/light/Kconfig | 10 ++
> drivers/iio/light/Makefile | 1 +
> drivers/iio/light/bh1750.c | 322 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 333 insertions(+)
> create mode 100644 drivers/iio/light/bh1750.c
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 5a3237b..9fb79ca 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -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 "BH1750 ambient light sensor"
Better use ROHM BH1750 .. here.
> +static const struct iio_chan_spec bh1750_channels[] = {
> + {
> + .type = IIO_INTENSITY,
Shouldn't this be IIO_LIGHT channel type?
Users will get illuminance after multiplying raw value with scale.
> + .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 = &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 devm_iio_device_register(&client->dev, indio_dev);
You need also to add a remove function where the chip is powered down. Then
you shouldn't use devm_iio_device_register here, because you need to control
the order of chip powerdown/ device unregister operations at remove.
thanks,
Daniel.
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