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iio: adc: Fix polling of INA219 conversion ready flag

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While the INA226 has a conversion ready flag (CVRF) in the R/W Mask/Enable
register with read-to-clear semantics, the corresponding bit of the INA219
(CNVR) is part of the bus voltage register. The flag is cleared by reading
the power register.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Stefan Brüns 2017-05-24 02:09:07 +02:00 committed by Jonathan Cameron
parent 7b34697e96
commit e5c2ce6bac
1 changed files with 29 additions and 7 deletions
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36
drivers/iio/adc/ina2xx-adc.c
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@ -44,6 +44,7 @@
#define INA226_MASK_ENABLE 0x06
#define INA226_CVRF BIT(3)
#define INA219_CNVR BIT(1)
#define INA2XX_MAX_REGISTERS 8
@ -592,6 +593,7 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
int bit, ret, i = 0;
s64 time_a, time_b;
unsigned int alert;
int cnvr_need_clear = 0;
time_a = iio_get_time_ns(indio_dev);
@ -603,22 +605,30 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
* we check the ConVersionReadyFlag.
* On hardware that supports using the ALERT pin to toggle a
* GPIO a triggered buffer could be used instead.
* For now, we pay for that extra read of the ALERT register
* For now, we do an extra read of the MASK_ENABLE register (INA226)
* resp. the BUS_VOLTAGE register (INA219).
*/
if (!chip->allow_async_readout)
do {
ret = regmap_read(chip->regmap, INA226_MASK_ENABLE,
&alert);
if (chip->config->chip_id == ina226) {
ret = regmap_read(chip->regmap,
INA226_MASK_ENABLE, &alert);
alert &= INA226_CVRF;
} else {
ret = regmap_read(chip->regmap,
INA2XX_BUS_VOLTAGE, &alert);
alert &= INA219_CNVR;
cnvr_need_clear = alert;
}
if (ret < 0)
return ret;
alert &= INA226_CVRF;
} while (!alert);
/*
* Single register reads: bulk_read will not work with ina226
* as there is no auto-increment of the address register for
* data length longer than 16bits.
* Single register reads: bulk_read will not work with ina226/219
* as there is no auto-increment of the register pointer.
*/
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength) {
@ -630,6 +640,18 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
return ret;
data[i++] = val;
if (INA2XX_SHUNT_VOLTAGE + bit == INA2XX_POWER)
cnvr_need_clear = 0;
}
/* Dummy read on INA219 power register to clear CNVR flag */
if (cnvr_need_clear && chip->config->chip_id == ina219) {
unsigned int val;
ret = regmap_read(chip->regmap, INA2XX_POWER, &val);
if (ret < 0)
return ret;
}
time_b = iio_get_time_ns(indio_dev);