Re: [RFC v1 4/4] iio: chemical: add SGX VZ89x VOC sensor support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sat, Sep 5, 2015 at 8:53 AM, Matt Ranostay <mranostay@xxxxxxxxx> wrote:
> Add support for VZ89X sensors VOC and CO2 reporting channels in
> ppm/ppb units.

Adding more info on this would be great.

s/VOC/VOC(volatile organic compound)

Also, link to datasheet?

>
> Signed-off-by: Matt Ranostay <mranostay@xxxxxxxxx>
> ---
>  .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
>  drivers/iio/Kconfig                                |   1 +
>  drivers/iio/Makefile                               |   1 +
>  drivers/iio/chemical/Makefile                      |   6 +
>  drivers/iio/chemical/vz89x.c                       | 237 +++++++++++++++++++++

Do you have a real part number for vz89x.c. Sometime ago, we agree to
avoid using generic part
numbers in files. So vz890 (if exists) is preferred over vz89x.c.

Is vz89x a family of devices? :)

>  5 files changed, 246 insertions(+)
>  create mode 100644 drivers/iio/chemical/Makefile
>  create mode 100644 drivers/iio/chemical/vz89x.c
>
> diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> index d77d412..a550216 100644
> --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> @@ -88,6 +88,7 @@ ricoh,rs5c372b                I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
>  ricoh,rv5c386          I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
>  ricoh,rv5c387a         I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
>  samsung,24ad0xd1       S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
> +sgx,vz89x              SGX Sensortech VZ89X Sensors

You should also CC devicetree people for this.

>  sii,s35390a            2-wire CMOS real-time clock
>  skyworks,sky81452      Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply
>  st-micro,24c256                i2c serial eeprom  (24cxx)
> diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
> index 4011eff..9664e9c 100644
> --- a/drivers/iio/Kconfig
> +++ b/drivers/iio/Kconfig
> @@ -61,6 +61,7 @@ config IIO_CONSUMERS_PER_TRIGGER
>  source "drivers/iio/accel/Kconfig"
>  source "drivers/iio/adc/Kconfig"
>  source "drivers/iio/amplifiers/Kconfig"
> +source "drivers/iio/chemical/Kconfig"
>  source "drivers/iio/common/Kconfig"
>  source "drivers/iio/dac/Kconfig"
>  source "drivers/iio/frequency/Kconfig"
> diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
> index 698afc2..2288684 100644
> --- a/drivers/iio/Makefile
> +++ b/drivers/iio/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o
>  obj-y += accel/
>  obj-y += adc/
>  obj-y += amplifiers/
> +obj-y += chemical/
>  obj-y += common/
>  obj-y += dac/
>  obj-y += gyro/
> diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile
> new file mode 100644
> index 0000000..7292f2d
> --- /dev/null
> +++ b/drivers/iio/chemical/Makefile
> @@ -0,0 +1,6 @@
> +#
> +# Makefile for IIO chemical sensors
> +#
> +
> +# When adding new entries keep the list in alphabetical order
> +obj-$(CONFIG_VZ89X)            += vz89x.o
> diff --git a/drivers/iio/chemical/vz89x.c b/drivers/iio/chemical/vz89x.c
> new file mode 100644
> index 0000000..a596a22
> --- /dev/null
> +++ b/drivers/iio/chemical/vz89x.c
> @@ -0,0 +1,237 @@
> +/*
> + * vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
> + *
> + * Copyright (C) 2015 Matt Ranostay <mranostay@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that 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.
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/init.h>
> +#include <linux/i2c.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +#define VZ89X_REG_MEASUREMENT          0x09
> +#define VZ89X_REG_MEASUREMENT_SIZE     6
> +
> +#define VZ89X_VOC_CO2_IDX      0
> +#define VZ89X_VOC_SHORT_IDX    1
> +#define VZ89X_VOC_TVOC_IDX     2
> +#define VZ89X_RESISTANCE_IDX   3
> +
> +struct vz89x_data {
> +       struct i2c_client *client;
> +       struct mutex lock;
> +       unsigned long last_update;
> +
> +       u8 buffer[VZ89X_REG_MEASUREMENT_SIZE];
> +};
> +
> +static const struct iio_chan_spec vz89x_channels[] = {
> +       {
> +               .type = IIO_CONCENTRATION,
> +               .channel2 = IIO_MOD_PPM,
> +               .modified = 1,
> +               .info_mask_separate = BIT(IIO_CHAN_INFO_OFFSET) |
> +                       BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> +               .address = VZ89X_VOC_CO2_IDX,
> +               .extend_name = "CO2",
> +       },
> +       {
> +               .type = IIO_CONCENTRATION,
> +               .info_mask_separate =
> +                       BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> +               .address = VZ89X_VOC_SHORT_IDX,
> +               .extend_name = "VOC_short",
> +       },
> +       {
> +               .type = IIO_CONCENTRATION,
> +               .channel2 = IIO_MOD_PPB,
> +               .modified = 1,
> +               .info_mask_separate =
> +                       BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> +               .address = VZ89X_VOC_TVOC_IDX,
> +               .extend_name = "tVOC",
> +       },
> +       {
> +               .type = IIO_RESISTANCE,
> +               .info_mask_separate =
> +                       BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> +               .address = VZ89X_RESISTANCE_IDX,
> +       },
> +};
> +
> +static int vz89x_get_measurement(struct vz89x_data *data)
> +{
> +       int ret;
> +       int i;
> +
> +       /* sensor can only be polled once a second max per datasheet */
> +       if (!time_after(jiffies, data->last_update + HZ))
> +               return 0;
> +
> +       ret = i2c_smbus_write_word_data(data->client,
> +                                       VZ89X_REG_MEASUREMENT, 0);
> +       if (ret < 0)
> +               return ret;
> +
> +       for (i = 0; i < VZ89X_REG_MEASUREMENT_SIZE; i++) {
> +               ret = i2c_smbus_read_byte(data->client);

i2c_smbus_block_read ?

> +               if (ret < 0)
> +                       return ret;
> +       }
> +
> +       data->last_update = jiffies;
> +
> +       return 0;
> +}
> +
> +static int vz89x_get_resistance_reading(struct vz89x_data *data,
> +                                       struct iio_chan_spec const *chan)
> +{
> +       u8 *buf = &data->buffer[chan->address];
> +
> +       return buf[0] | ((u16)buf[1] << 8) | ((u16)buf[2] << 16);
> +}
> +
> +static int vz89x_get_channel_scale(struct iio_chan_spec const *chan,
> +                                  int *val, int *val2)
> +{
> +       int ret = -EINVAL;
> +
> +       switch (chan->address) {
> +       case VZ89X_VOC_CO2_IDX:
> +               *val = 1600;
> +               *val2 = 229;
> +               ret = IIO_VAL_FRACTIONAL;
> +               break;
> +       case VZ89X_VOC_SHORT_IDX:
> +               *val = 0;
> +               ret = IIO_VAL_INT;
> +               break;
> +       case VZ89X_VOC_TVOC_IDX:
> +               *val = 1000;
> +               *val2 = 229;
> +               ret = IIO_VAL_FRACTIONAL;
> +       }
> +
> +       return ret;
> +}
> +
> +static int vz89x_read_raw(struct iio_dev *indio_dev,
> +                         struct iio_chan_spec const *chan, int *val,
> +                         int *val2, long mask)
> +{
> +       struct vz89x_data *data = iio_priv(indio_dev);
> +       int ret = -EINVAL;
> +
> +       switch (mask) {
> +       case IIO_CHAN_INFO_RAW:
> +               mutex_lock(&data->lock);
> +               ret = vz89x_get_measurement(data);
> +
> +               if (chan->type == IIO_RESISTANCE)
> +                       *val = vz89x_get_resistance_reading(data, chan);
> +               else
> +                       *val = data->buffer[chan->address] - 13;
> +
> +               if (!ret)
> +                       ret = IIO_VAL_INT;
> +
> +               mutex_unlock(&data->lock);
> +               break;
> +       case IIO_CHAN_INFO_SCALE:
> +               switch (chan->type) {
> +               case IIO_RESISTANCE:
> +                       *val = 10;
> +                       ret = IIO_VAL_INT;
> +                       break;
> +               case IIO_CONCENTRATION:
> +                       ret = vz89x_get_channel_scale(chan, val, val2);
> +                       break;
> +               default:
> +                       ret = -EINVAL;
> +               }
> +               break;
> +       case IIO_CHAN_INFO_OFFSET:
> +               *val = 400;
> +               ret = IIO_VAL_INT;
> +               break;
> +       }
> +
> +       return ret;
> +}
> +
> +static const struct iio_info vz89x_info = {
> +       .driver_module  = THIS_MODULE,
> +       .read_raw       = vz89x_read_raw,
> +};
> +
> +static int vz89x_probe(struct i2c_client *client,
> +                      const struct i2c_device_id *id)
> +{
> +       struct iio_dev *indio_dev;
> +       struct vz89x_data *data;
> +
> +       if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA |
> +                                    I2C_FUNC_SMBUS_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->last_update = jiffies - HZ;
> +       mutex_init(&data->lock);
> +
> +       indio_dev->dev.parent = &client->dev;
> +       indio_dev->info = &vz89x_info,
> +       indio_dev->name = dev_name(&client->dev);
> +       indio_dev->modes = INDIO_DIRECT_MODE;
> +
> +       indio_dev->channels = vz89x_channels;
> +       indio_dev->num_channels = ARRAY_SIZE(vz89x_channels);
> +
> +       return devm_iio_device_register(&client->dev, indio_dev);
> +}
> +
> +static const struct i2c_device_id vz89x_id[] = {
> +       { "vz89x", 0 },
> +       { }
> +};
> +MODULE_DEVICE_TABLE(i2c, vz89x_id);
> +
> +static const struct of_device_id vz89x_dt_ids[] = {
> +       { .compatible = "sgx,vz89x" },
> +       { }
> +};
> +MODULE_DEVICE_TABLE(of, vz89x_dt_ids);
> +
> +static struct i2c_driver vz89x_driver = {
> +       .driver = {
> +               .name   = "vz89x",
> +               .of_match_table = of_match_ptr(vz89x_dt_ids),
> +       },
> +       .probe = vz89x_probe,
> +       .id_table = vz89x_id,
> +};
> +module_i2c_driver(vz89x_driver);
> +
> +MODULE_AUTHOR("Matt Ranostay <mranostay@xxxxxxxxx>");
> +MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
> +MODULE_LICENSE("GPL v2");
> --
> 1.9.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Input]     [Linux Kernel]     [Linux SCSI]     [X.org]

  Powered by Linux