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drivers: sensor: ccs811: add interface for BASELINE management

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Proper use of the CCS811 requires maintenance of the BASELINE
register value measured in clean air at various points in the sensor
life cycle.  The sensor driver abstraction has no facility to support
this, so add an application header with functions to fetch and update
the register value.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit is contained in:
Peter A. Bigot 2018-11-22 16:10:48 -06:00 • committed by Maureen Helm
commit af0c69fb9f
3 changed files with 94 additions and 1 deletions
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36
drivers/sensor/ccs811/ccs811.c
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@ -70,6 +70,40 @@ static inline u8_t error_from_status(int status)
return status >> 8;
}
int ccs811_baseline_fetch(struct device *dev)
{
const u8_t cmd = CCS811_REG_BASELINE;
struct ccs811_data *drv_data = dev->driver_data;
int rc;
u16_t baseline;
set_wake(drv_data, true);
rc = i2c_write_read(drv_data->i2c, DT_INST_0_AMS_CCS811_BASE_ADDRESS,
&cmd, sizeof(cmd),
(u8_t *)&baseline, sizeof(baseline));
set_wake(drv_data, false);
if (rc <= 0) {
rc = baseline;
}
return rc;
}
int ccs811_baseline_update(struct device *dev,
u16_t baseline)
{
struct ccs811_data *drv_data = dev->driver_data;
u8_t buf[1 + sizeof(baseline)];
int rc;
buf[0] = CCS811_REG_BASELINE;
memcpy(buf + 1, &baseline, sizeof(baseline));
set_wake(drv_data, true);
rc = i2c_write(drv_data->i2c, buf, sizeof(buf), DT_INST_0_AMS_CCS811_BASE_ADDRESS);
set_wake(drv_data, false);
return rc;
}
static int ccs811_sample_fetch(struct device *dev, enum sensor_channel chan)
{
struct ccs811_data *drv_data = dev->driver_data;
@ -285,7 +319,7 @@ int ccs811_set_thresholds(struct device *dev)
#endif /* CONFIG_CCS811_TRIGGER */
int ccs811_init(struct device *dev)
static int ccs811_init(struct device *dev)
{
struct ccs811_data *drv_data = dev->driver_data;
int ret = 0;