The switch statement in ade9000_write_raw() attempts to match
chan->address against ADE9000_REG_AWATTOS (0x00F) to dispatch
the calibration offset write for active power channels. However,
chan->address is set via ADE9000_ADDR_ADJUST(ADE9000_REG_AWATT,
num), so after masking the phase bits, tmp holds
ADE9000_REG_AWATT (0x210), which never matches 0x00F.

As a result, writing IIO_CHAN_INFO_CALIBBIAS for IIO_POWER always
falls through to the default case and returns -EINVAL, making
active power offset calibration silently broken.

Fix this by matching against ADE9000_REG_AWATT instead, which is
the actual base address stored in chan->address for watt channels.

Reference:ADE9000 datasheet (Rev. B), AWATTOS is the offset correction
register at 0x00F (p. 44), while AWATT is the total active power
register at 0x210 (p. 48).

Fixes: 81de7b4619fc ("iio: adc: add ade9000 support")
Signed-off-by: Giorgi Tchankvetadze <giorgitchankvetadze1997@gmail.com>
---
v2:
 - Added Fixes tag (Andy)
 - Added datasheet reference (Rev. B, p. 44 and p. 48) (Andy)

 drivers/iio/adc/ade9000.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ade9000.c b/drivers/iio/adc/ade9000.c
index 5dcc26a08970..1499fb1c718a 100644
--- a/drivers/iio/adc/ade9000.c
+++ b/drivers/iio/adc/ade9000.c
@@ -1123,7 +1123,7 @@ static int ade9000_write_raw(struct iio_dev *indio_dev,
 			tmp &= ~ADE9000_PHASE_C_POS_BIT;
 
 			switch (tmp) {
-			case ADE9000_REG_AWATTOS:
+			case ADE9000_REG_AWATT:
 				return regmap_write(st->regmap,
 						    ADE9000_ADDR_ADJUST(ADE9000_REG_AWATTOS,
 									chan->channel), val);
-- 
2.52.0

On Thu, Feb 26, 2026 at 06:07:02PM +0400, Giorgi Tchankvetadze wrote:
> The switch statement in ade9000_write_raw() attempts to match
> chan->address against ADE9000_REG_AWATTOS (0x00F) to dispatch
> the calibration offset write for active power channels. However,
> chan->address is set via ADE9000_ADDR_ADJUST(ADE9000_REG_AWATT,
> num), so after masking the phase bits, tmp holds
> ADE9000_REG_AWATT (0x210), which never matches 0x00F.
> 
> As a result, writing IIO_CHAN_INFO_CALIBBIAS for IIO_POWER always
> falls through to the default case and returns -EINVAL, making
> active power offset calibration silently broken.
> 
> Fix this by matching against ADE9000_REG_AWATT instead, which is
> the actual base address stored in chan->address for watt channels.
> 
> Reference:ADE9000 datasheet (Rev. B), AWATTOS is the offset correction
> register at 0x00F (p. 44), while AWATT is the total active power
> register at 0x210 (p. 48).

Please, avoid sending a new version earlier than 24h after the previous one!
I think the best who can review this is somebody with HW. Preferably
one from vendor company.

-- 
With Best Regards,
Andy Shevchenko