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iio: chemical: atlas-ph-sensor: add EC feature 

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Matt Ranostay 2016-05-24 21:29:20 -07:00 committed by Jonathan Cameron
parent 4b9d2090a4
commit e8dd92bfbf
3 changed files with 147 additions and 5 deletions
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22
Documentation/devicetree/bindings/iio/chemical/atlas,ec-sm.txt Normal file
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@ -0,0 +1,22 @@
* Atlas Scientific EC-SM OEM sensor
http://www.atlas-scientific.com/_files/_datasheets/_oem/EC_oem_datasheet.pdf
Required properties:
- compatible: must be "atlas,ec-sm"
- reg: the I2C address of the sensor
- interrupt-parent: should be the phandle for the interrupt controller
- interrupts: the sole interrupt generated by the device
Refer to interrupt-controller/interrupts.txt for generic interrupt client
node bindings.
Example:
atlas@64 {
compatible = "atlas,ec-sm";
reg = <0x64>;
interrupt-parent = <&gpio1>;
interrupts = <16 2>;
};

8
drivers/iio/chemical/Kconfig
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@ -5,15 +5,17 @@
menu "Chemical Sensors"
config ATLAS_PH_SENSOR
tristate "Atlas Scientific OEM pH-SM sensor"
tristate "Atlas Scientific OEM SM sensors"
depends on I2C
select REGMAP_I2C
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
select IRQ_WORK
help
Say Y here to build I2C interface support for the Atlas
Scientific OEM pH-SM sensor.
Say Y here to build I2C interface support for the following
Atlas Scientific OEM SM sensors:
* pH SM sensor
* EC SM sensor
To compile this driver as module, choose M here: the
module will be called atlas-ph-sensor.

122
drivers/iio/chemical/atlas-ph-sensor.c
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@ -50,13 +50,28 @@
#define ATLAS_REG_PH_CALIB_STATUS_MID BIT(1)
#define ATLAS_REG_PH_CALIB_STATUS_HIGH BIT(2)
#define ATLAS_REG_EC_CALIB_STATUS 0x0f
#define ATLAS_REG_EC_CALIB_STATUS_MASK 0x0f
#define ATLAS_REG_EC_CALIB_STATUS_DRY BIT(0)
#define ATLAS_REG_EC_CALIB_STATUS_SINGLE BIT(1)
#define ATLAS_REG_EC_CALIB_STATUS_LOW BIT(2)
#define ATLAS_REG_EC_CALIB_STATUS_HIGH BIT(3)
#define ATLAS_REG_PH_TEMP_DATA 0x0e
#define ATLAS_REG_PH_DATA 0x16
#define ATLAS_REG_EC_PROBE 0x08
#define ATLAS_REG_EC_TEMP_DATA 0x10
#define ATLAS_REG_EC_DATA 0x18
#define ATLAS_REG_TDS_DATA 0x1c
#define ATLAS_REG_PSS_DATA 0x20
#define ATLAS_PH_INT_TIME_IN_US 450000
#define ATLAS_EC_INT_TIME_IN_US 650000
enum {
ATLAS_PH_SM,
ATLAS_EC_SM,
};
struct atlas_data {
@ -66,12 +81,13 @@ struct atlas_data {
struct regmap *regmap;
struct irq_work work;
__be32 buffer[4]; /* 32-bit pH data + 32-bit pad + 64-bit timestamp */
__be32 buffer[6]; /* 96-bit data + 32-bit pad + 64-bit timestamp */
};
static const struct regmap_range atlas_volatile_ranges[] = {
regmap_reg_range(ATLAS_REG_INT_CONTROL, ATLAS_REG_INT_CONTROL),
regmap_reg_range(ATLAS_REG_PH_DATA, ATLAS_REG_PH_DATA + 4),
regmap_reg_range(ATLAS_REG_EC_DATA, ATLAS_REG_PSS_DATA + 4),
};
static const struct regmap_access_table atlas_volatile_table = {
@ -86,7 +102,7 @@ static const struct regmap_config atlas_regmap_config = {
.val_bits = 8,
.volatile_table = &atlas_volatile_table,
.max_register = ATLAS_REG_PH_DATA + 4,
.max_register = ATLAS_REG_PSS_DATA + 4,
.cache_type = REGCACHE_RBTREE,
};
@ -115,6 +131,50 @@ static const struct iio_chan_spec atlas_ph_channels[] = {
},
};
#define ATLAS_EC_CHANNEL(_idx, _addr) \
{\
.type = IIO_CONCENTRATION, \
.indexed = 1, \
.channel = _idx, \
.address = _addr, \
.info_mask_separate = \
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \
.scan_index = _idx + 1, \
.scan_type = { \
.sign = 'u', \
.realbits = 32, \
.storagebits = 32, \
.endianness = IIO_BE, \
}, \
}
static const struct iio_chan_spec atlas_ec_channels[] = {
{
.type = IIO_ELECTRICALCONDUCTIVITY,
.address = ATLAS_REG_EC_DATA,
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
.scan_index = 0,
.scan_type = {
.sign = 'u',
.realbits = 32,
.storagebits = 32,
.endianness = IIO_BE,
},
},
ATLAS_EC_CHANNEL(0, ATLAS_REG_TDS_DATA),
ATLAS_EC_CHANNEL(1, ATLAS_REG_PSS_DATA),
IIO_CHAN_SOFT_TIMESTAMP(3),
{
.type = IIO_TEMP,
.address = ATLAS_REG_EC_TEMP_DATA,
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
.output = 1,
.scan_index = -1
},
};
static int atlas_check_ph_calibration(struct atlas_data *data)
{
struct device *dev = &data->client->dev;
@ -142,6 +202,44 @@ static int atlas_check_ph_calibration(struct atlas_data *data)
return 0;
}
static int atlas_check_ec_calibration(struct atlas_data *data)
{
struct device *dev = &data->client->dev;
int ret;
unsigned int val;
ret = regmap_bulk_read(data->regmap, ATLAS_REG_EC_PROBE, &val, 2);
if (ret)
return ret;
dev_info(dev, "probe set to K = %d.%.2d", be16_to_cpu(val) / 100,
be16_to_cpu(val) % 100);
ret = regmap_read(data->regmap, ATLAS_REG_EC_CALIB_STATUS, &val);
if (ret)
return ret;
if (!(val & ATLAS_REG_EC_CALIB_STATUS_MASK)) {
dev_warn(dev, "device has not been calibrated\n");
return 0;
}
if (!(val & ATLAS_REG_EC_CALIB_STATUS_DRY))
dev_warn(dev, "device missing dry point calibration\n");
if (val & ATLAS_REG_EC_CALIB_STATUS_SINGLE) {
dev_warn(dev, "device using single point calibration\n");
} else {
if (!(val & ATLAS_REG_EC_CALIB_STATUS_LOW))
dev_warn(dev, "device missing low point calibration\n");
if (!(val & ATLAS_REG_EC_CALIB_STATUS_HIGH))
dev_warn(dev, "device missing high point calibration\n");
}
return 0;
}
struct atlas_device {
const struct iio_chan_spec *channels;
int num_channels;
@ -159,6 +257,14 @@ static struct atlas_device atlas_devices[] = {
.calibration = &atlas_check_ph_calibration,
.delay = ATLAS_PH_INT_TIME_IN_US,
},
[ATLAS_EC_SM] = {
.channels = atlas_ec_channels,
.num_channels = 5,
.data_reg = ATLAS_REG_EC_DATA,
.calibration = &atlas_check_ec_calibration,
.delay = ATLAS_EC_INT_TIME_IN_US,
},
};
static int atlas_set_powermode(struct atlas_data *data, int on)
@ -294,6 +400,8 @@ static int atlas_read_raw(struct iio_dev *indio_dev,
(u8 *) &reg, sizeof(reg));
break;
case IIO_PH:
case IIO_CONCENTRATION:
case IIO_ELECTRICALCONDUCTIVITY:
mutex_lock(&indio_dev->mlock);
if (iio_buffer_enabled(indio_dev))
@ -324,6 +432,14 @@ static int atlas_read_raw(struct iio_dev *indio_dev,
*val = 1; /* 0.001 */
*val2 = 1000;
break;
case IIO_ELECTRICALCONDUCTIVITY:
*val = 1; /* 0.00001 */
*val = 100000;
break;
case IIO_CONCENTRATION:
*val = 0; /* 0.000000001 */
*val2 = 1000;
return IIO_VAL_INT_PLUS_NANO;
default:
return -EINVAL;
}
@ -358,12 +474,14 @@ static const struct iio_info atlas_info = {
static const struct i2c_device_id atlas_id[] = {
{ "atlas-ph-sm", ATLAS_PH_SM},
{ "atlas-ec-sm", ATLAS_EC_SM},
{}
};
MODULE_DEVICE_TABLE(i2c, atlas_id);
static const struct of_device_id atlas_dt_ids[] = {
{ .compatible = "atlas,ph-sm", .data = (void *)ATLAS_PH_SM, },
{ .compatible = "atlas,ec-sm", .data = (void *)ATLAS_EC_SM, },
{ }
};
MODULE_DEVICE_TABLE(of, atlas_dt_ids);