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| Started by | Matt Ranostay <mranostay@gmail.com> |
|---|---|
| First post | 2015-09-07 04:40 +0200 |
| Last post | 2015-09-07 06:30 +0200 |
| Articles | 4 — 2 participants |
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[RFC v2 4/4] iio: chemical: add SGX VZ89x VOC sensor support Matt Ranostay <mranostay@gmail.com> - 2015-09-07 04:40 +0200
Re: [RFC v2 4/4] iio: chemical: add SGX VZ89x VOC sensor support Matt Ranostay <mranostay@gmail.com> - 2015-09-07 06:30 +0200
Re: [RFC v2 4/4] iio: chemical: add SGX VZ89x VOC sensor support Lars-Peter Clausen <lars@metafoo.de> - 2015-09-07 10:10 +0200
Re: [RFC v2 4/4] iio: chemical: add SGX VZ89x VOC sensor support Matt Ranostay <mranostay@gmail.com> - 2015-09-07 06:30 +0200
| From | Matt Ranostay <mranostay@gmail.com> |
|---|---|
| Date | 2015-09-07 04:40 +0200 |
| Subject | [RFC v2 4/4] iio: chemical: add SGX VZ89x VOC sensor support |
| Message-ID | <q5UvE-Hs-3@gated-at.bofh.it> |
Add support for VZ89X sensors VOC and CO2 reporting channels in
percentage which can be converted to part per million.
Signed-off-by: Matt Ranostay <mranostay@gmail.com>
---
.../ABI/testing/sysfs-bus-iio-chemical-vz89x | 30 +++
.../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 | 236 +++++++++++++++++++++
6 files changed, 275 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
create mode 100644 drivers/iio/chemical/Makefile
create mode 100644 drivers/iio/chemical/vz89x.c
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x b/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
new file mode 100644
index 0000000..74f2a35
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
@@ -0,0 +1,30 @@
+What: /sys/bus/iio/devices/iio:deviceX/in_concentration_CO2_raw
+Date: September 2015
+KernelVersion: 4.3
+Contact: Matt Ranostay <mranostay@gmail.com>
+Description:
+ Get the unscaled, and no offset applied CO2 gas percentage
+ value.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_concentration_VOC_short_raw
+Date: September 2015
+KernelVersion: 4.3
+Contact: Matt Ranostay <mranostay@gmail.com>
+Description:
+ Get the raw calibration VOC value from the sensor.
+ This value has little application outside of calibration.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_concentration_tVOC_raw
+Date: September 2015
+KernelVersion: 4.3
+Contact: Matt Ranostay <mranostay@gmail.com>
+Description:
+ Get the unscaled, and no offset applied total VOC gas
+ percentage value.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_resistance_raw
+Date: September 2015
+KernelVersion: 4.3
+Contact: Matt Ranostay <mranostay@gmail.com>
+Description:
+ Get the unscaled sensor resistance value.
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
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..ac381cc
--- /dev/null
+++ b/drivers/iio/chemical/vz89x.c
@@ -0,0 +1,236 @@
+/*
+ * vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
+ *
+ * Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com>
+ *
+ * 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_VOC_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,
+ .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),
+ .address = VZ89X_VOC_SHORT_IDX,
+ .extend_name = "VOC_short",
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .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_VOC_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);
+ if (ret < 0)
+ return ret;
+ data->buffer[i] = ret;
+ }
+
+ data->last_update = jiffies;
+
+ return 0;
+}
+
+static int vz89x_get_resistance_reading(struct vz89x_data *data)
+{
+ u8 *buf = &data->buffer[VZ89X_VOC_TVOC_IDX];
+
+ return buf[0] | ((u16)buf[1] << 8) | ((u32)buf[2] << 16);
+}
+
+static int vz89x_get_channel_scale(struct iio_chan_spec const *chan,
+ int *val, int *val2)
+{
+ switch (chan->address) {
+ case VZ89X_VOC_CO2_IDX:
+ *val = 1600;
+ *val2 = 229;
+ return IIO_VAL_FRACTIONAL;
+ case VZ89X_VOC_TVOC_IDX:
+ *val = 1000;
+ *val2 = 229;
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ return -EINVAL;
+}
+
+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);
+ mutex_unlock(&data->lock);
+
+ if (ret)
+ return ret;
+
+ switch (chan->address) {
+ case VZ89X_VOC_CO2_IDX:
+ *val = 0;
+ *val2 = data->buffer[chan->address] - 13;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case VZ89X_VOC_SHORT_IDX:
+ *val = data->buffer[chan->address] - 13;
+ return IIO_VAL_INT;
+ case VZ89X_VOC_TVOC_IDX:
+ *val = 0;
+ *val2 = data->buffer[chan->address] - 13;
+ return IIO_VAL_INT_PLUS_NANO;
+ case VZ89X_VOC_RESISTANCE_IDX:
+ *val = vz89x_get_resistance_reading(data);
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_RESISTANCE:
+ *val = 10;
+ return IIO_VAL_INT;
+ case IIO_CONCENTRATION:
+ return vz89x_get_channel_scale(chan, val, val2);
+ default:
+ return -EINVAL;
+ }
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ *val = 0;
+ *val2 = 400;
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+
+ 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@gmail.com>");
+MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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| From | Matt Ranostay <mranostay@gmail.com> |
|---|---|
| Date | 2015-09-07 06:30 +0200 |
| Message-ID | <q5We5-3dX-1@gated-at.bofh.it> |
| In reply to | #1219899 |
Thinking this over do we needed a IIO_CHAN_INFO_PROCESSED_OFFSET to
signal that it needs to be after the (value - offset) * scale
calculation?
Thanks,
Matt
On Sun, Sep 6, 2015 at 9:20 PM, Matt Ranostay <mranostay@gmail.com> wrote:
> Also one thing to note here is calculation is ((value - 13) * scale))
> + offset versus the normal (value + offset) * scale.. Not sure the
> best way to handle this possibly could be..
>
> Thanks,
>
> Matt
>
> On Sun, Sep 6, 2015 at 8:13 PM, George McCollister
> <george.mccollister@gmail.com> wrote:
>>
>>
>> On Sun, Sep 6, 2015 at 9:39 PM, Matt Ranostay <mranostay@gmail.com> wrote:
>>>
>>> Add support for VZ89X sensors VOC and CO2 reporting channels in
>>> percentage which can be converted to part per million.
>>>
>>> Signed-off-by: Matt Ranostay <mranostay@gmail.com>
>>> ---
>>> .../ABI/testing/sysfs-bus-iio-chemical-vz89x | 30 +++
>>> .../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 | 236
>>> +++++++++++++++++++++
>>> 6 files changed, 275 insertions(+)
>>> create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
>>> create mode 100644 drivers/iio/chemical/Makefile
>>> create mode 100644 drivers/iio/chemical/vz89x.c
>>>
>>> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
>>> b/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
>>> new file mode 100644
>>> index 0000000..74f2a35
>>> --- /dev/null
>>> +++ b/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
>>> @@ -0,0 +1,30 @@
>>> +What: /sys/bus/iio/devices/iio:deviceX/in_concentration_CO2_raw
>>> +Date: September 2015
>>> +KernelVersion: 4.3
>>> +Contact: Matt Ranostay <mranostay@gmail.com>
>>> +Description:
>>> + Get the unscaled, and no offset applied CO2 gas percentage
>>> + value.
>>> +
>>> +What:
>>> /sys/bus/iio/devices/iio:deviceX/in_concentration_VOC_short_raw
>>> +Date: September 2015
>>> +KernelVersion: 4.3
>>> +Contact: Matt Ranostay <mranostay@gmail.com>
>>> +Description:
>>> + Get the raw calibration VOC value from the sensor.
>>> + This value has little application outside of calibration.
>>> +
>>> +What: /sys/bus/iio/devices/iio:deviceX/in_concentration_tVOC_raw
>>> +Date: September 2015
>>> +KernelVersion: 4.3
>>> +Contact: Matt Ranostay <mranostay@gmail.com>
>>> +Description:
>>> + Get the unscaled, and no offset applied total VOC gas
>>> + percentage value.
>>> +
>>> +What: /sys/bus/iio/devices/iio:deviceX/in_resistance_raw
>>> +Date: September 2015
>>> +KernelVersion: 4.3
>>> +Contact: Matt Ranostay <mranostay@gmail.com>
>>> +Description:
>>> + Get the unscaled sensor resistance value.
>>> 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
>>> 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..ac381cc
>>> --- /dev/null
>>> +++ b/drivers/iio/chemical/vz89x.c
>>> @@ -0,0 +1,236 @@
>>> +/*
>>> + * vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
>>> + *
>>> + * Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com>
>>> + *
>>> + * 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_VOC_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,
>>> + .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),
>>> + .address = VZ89X_VOC_SHORT_IDX,
>>> + .extend_name = "VOC_short",
>>> + },
>>> + {
>>> + .type = IIO_CONCENTRATION,
>>> + .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_VOC_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);
>>> + if (ret < 0)
>>> + return ret;
>>> + data->buffer[i] = ret;
>>> + }
>>> +
>>> + data->last_update = jiffies;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int vz89x_get_resistance_reading(struct vz89x_data *data)
>>> +{
>>> + u8 *buf = &data->buffer[VZ89X_VOC_TVOC_IDX];
>>> +
>>> + return buf[0] | ((u16)buf[1] << 8) | ((u32)buf[2] << 16);
>>> +}
>>> +
>>> +static int vz89x_get_channel_scale(struct iio_chan_spec const *chan,
>>> + int *val, int *val2)
>>> +{
>>> + switch (chan->address) {
>>> + case VZ89X_VOC_CO2_IDX:
>>> + *val = 1600;
>>> + *val2 = 229;
>>> + return IIO_VAL_FRACTIONAL;
>>> + case VZ89X_VOC_TVOC_IDX:
>>> + *val = 1000;
>>> + *val2 = 229;
>>> + return IIO_VAL_FRACTIONAL;
>>> + }
>>> +
>>> + return -EINVAL;
>>> +}
>>> +
>>> +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);
>>> + mutex_unlock(&data->lock);
>>> +
>>> + if (ret)
>>> + return ret;
>>> +
>>> + switch (chan->address) {
>>> + case VZ89X_VOC_CO2_IDX:
>>> + *val = 0;
>>> + *val2 = data->buffer[chan->address] - 13;
>>
>> Magic numbers are unlucky.
>>
>>>
>>> + return IIO_VAL_INT_PLUS_MICRO;
>>> + case VZ89X_VOC_SHORT_IDX:
>>> + *val = data->buffer[chan->address] - 13;
>>> + return IIO_VAL_INT;
>>> + case VZ89X_VOC_TVOC_IDX:
>>> + *val = 0;
>>> + *val2 = data->buffer[chan->address] - 13;
>>> + return IIO_VAL_INT_PLUS_NANO;
>>> + case VZ89X_VOC_RESISTANCE_IDX:
>>> + *val = vz89x_get_resistance_reading(data);
>>> + return IIO_VAL_INT;
>>> + default:
>>> + return -EINVAL;
>>> + }
>>> + break;
>>> + case IIO_CHAN_INFO_SCALE:
>>> + switch (chan->type) {
>>> + case IIO_RESISTANCE:
>>> + *val = 10;
>>> + return IIO_VAL_INT;
>>> + case IIO_CONCENTRATION:
>>> + return vz89x_get_channel_scale(chan, val, val2);
>>> + default:
>>> + return -EINVAL;
>>> + }
>>> + break;
>>> + case IIO_CHAN_INFO_OFFSET:
>>> + *val = 0;
>>> + *val2 = 400;
>>> + return IIO_VAL_INT_PLUS_MICRO;
>>> + }
>>> +
>>> + 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@gmail.com>");
>>> +MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
>>> +MODULE_LICENSE("GPL v2");
>>> --
>>> 1.9.1
>>>
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe devicetree" in
>>> the body of a message to majordomo@vger.kernel.org
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>>
>>
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| From | Lars-Peter Clausen <lars@metafoo.de> |
|---|---|
| Date | 2015-09-07 10:10 +0200 |
| Message-ID | <q5ZF0-8c3-21@gated-at.bofh.it> |
| In reply to | #1219923 |
On 09/07/2015 06:27 AM, Matt Ranostay wrote: > Thinking this over do we needed a IIO_CHAN_INFO_PROCESSED_OFFSET to > signal that it needs to be after the (value - offset) * scale > calculation? Well, value * scale + offset = (value + offset/scale) * scale. So just scale your offset inversely to the scale. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Matt Ranostay <mranostay@gmail.com> |
|---|---|
| Date | 2015-09-07 06:30 +0200 |
| Message-ID | <q5We5-3dX-5@gated-at.bofh.it> |
| In reply to | #1219899 |
Also one thing to note here is calculation is ((value - 13) * scale))
+ offset versus the normal (value + offset) * scale.. Not sure the
best way to handle this possibly could be..
Thanks,
Matt
On Sun, Sep 6, 2015 at 8:13 PM, George McCollister
<george.mccollister@gmail.com> wrote:
>
>
> On Sun, Sep 6, 2015 at 9:39 PM, Matt Ranostay <mranostay@gmail.com> wrote:
>>
>> Add support for VZ89X sensors VOC and CO2 reporting channels in
>> percentage which can be converted to part per million.
>>
>> Signed-off-by: Matt Ranostay <mranostay@gmail.com>
>> ---
>> .../ABI/testing/sysfs-bus-iio-chemical-vz89x | 30 +++
>> .../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 | 236
>> +++++++++++++++++++++
>> 6 files changed, 275 insertions(+)
>> create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
>> create mode 100644 drivers/iio/chemical/Makefile
>> create mode 100644 drivers/iio/chemical/vz89x.c
>>
>> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
>> b/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
>> new file mode 100644
>> index 0000000..74f2a35
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/sysfs-bus-iio-chemical-vz89x
>> @@ -0,0 +1,30 @@
>> +What: /sys/bus/iio/devices/iio:deviceX/in_concentration_CO2_raw
>> +Date: September 2015
>> +KernelVersion: 4.3
>> +Contact: Matt Ranostay <mranostay@gmail.com>
>> +Description:
>> + Get the unscaled, and no offset applied CO2 gas percentage
>> + value.
>> +
>> +What:
>> /sys/bus/iio/devices/iio:deviceX/in_concentration_VOC_short_raw
>> +Date: September 2015
>> +KernelVersion: 4.3
>> +Contact: Matt Ranostay <mranostay@gmail.com>
>> +Description:
>> + Get the raw calibration VOC value from the sensor.
>> + This value has little application outside of calibration.
>> +
>> +What: /sys/bus/iio/devices/iio:deviceX/in_concentration_tVOC_raw
>> +Date: September 2015
>> +KernelVersion: 4.3
>> +Contact: Matt Ranostay <mranostay@gmail.com>
>> +Description:
>> + Get the unscaled, and no offset applied total VOC gas
>> + percentage value.
>> +
>> +What: /sys/bus/iio/devices/iio:deviceX/in_resistance_raw
>> +Date: September 2015
>> +KernelVersion: 4.3
>> +Contact: Matt Ranostay <mranostay@gmail.com>
>> +Description:
>> + Get the unscaled sensor resistance value.
>> 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
>> 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..ac381cc
>> --- /dev/null
>> +++ b/drivers/iio/chemical/vz89x.c
>> @@ -0,0 +1,236 @@
>> +/*
>> + * vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
>> + *
>> + * Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com>
>> + *
>> + * 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_VOC_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,
>> + .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),
>> + .address = VZ89X_VOC_SHORT_IDX,
>> + .extend_name = "VOC_short",
>> + },
>> + {
>> + .type = IIO_CONCENTRATION,
>> + .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_VOC_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);
>> + if (ret < 0)
>> + return ret;
>> + data->buffer[i] = ret;
>> + }
>> +
>> + data->last_update = jiffies;
>> +
>> + return 0;
>> +}
>> +
>> +static int vz89x_get_resistance_reading(struct vz89x_data *data)
>> +{
>> + u8 *buf = &data->buffer[VZ89X_VOC_TVOC_IDX];
>> +
>> + return buf[0] | ((u16)buf[1] << 8) | ((u32)buf[2] << 16);
>> +}
>> +
>> +static int vz89x_get_channel_scale(struct iio_chan_spec const *chan,
>> + int *val, int *val2)
>> +{
>> + switch (chan->address) {
>> + case VZ89X_VOC_CO2_IDX:
>> + *val = 1600;
>> + *val2 = 229;
>> + return IIO_VAL_FRACTIONAL;
>> + case VZ89X_VOC_TVOC_IDX:
>> + *val = 1000;
>> + *val2 = 229;
>> + return IIO_VAL_FRACTIONAL;
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +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);
>> + mutex_unlock(&data->lock);
>> +
>> + if (ret)
>> + return ret;
>> +
>> + switch (chan->address) {
>> + case VZ89X_VOC_CO2_IDX:
>> + *val = 0;
>> + *val2 = data->buffer[chan->address] - 13;
>
> Magic numbers are unlucky.
>
>>
>> + return IIO_VAL_INT_PLUS_MICRO;
>> + case VZ89X_VOC_SHORT_IDX:
>> + *val = data->buffer[chan->address] - 13;
>> + return IIO_VAL_INT;
>> + case VZ89X_VOC_TVOC_IDX:
>> + *val = 0;
>> + *val2 = data->buffer[chan->address] - 13;
>> + return IIO_VAL_INT_PLUS_NANO;
>> + case VZ89X_VOC_RESISTANCE_IDX:
>> + *val = vz89x_get_resistance_reading(data);
>> + return IIO_VAL_INT;
>> + default:
>> + return -EINVAL;
>> + }
>> + break;
>> + case IIO_CHAN_INFO_SCALE:
>> + switch (chan->type) {
>> + case IIO_RESISTANCE:
>> + *val = 10;
>> + return IIO_VAL_INT;
>> + case IIO_CONCENTRATION:
>> + return vz89x_get_channel_scale(chan, val, val2);
>> + default:
>> + return -EINVAL;
>> + }
>> + break;
>> + case IIO_CHAN_INFO_OFFSET:
>> + *val = 0;
>> + *val2 = 400;
>> + return IIO_VAL_INT_PLUS_MICRO;
>> + }
>> +
>> + 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@gmail.com>");
>> +MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
>> +MODULE_LICENSE("GPL v2");
>> --
>> 1.9.1
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe devicetree" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
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