[PATCH] iio: humidity: ens210: Fix missing I2C functionality checks
From: Salah Triki
Date: Tue May 05 2026 - 05:06:53 EST
The ENS210 driver uses both `i2c_smbus_read_byte_data()` and
`i2c_smbus_read_word_data()` during the read and probe phases.
However, `i2c_check_functionality()` was only checking for block reads
and simple byte writes, which could lead to hardware interface
incompatibilities or errors on certain adapters that do not natively
support SMBus word or byte data transactions.
Add `I2C_FUNC_SMBUS_READ_BYTE_DATA` and `I2C_FUNC_SMBUS_READ_WORD_DATA`
to the functionality check mask to ensure the adapter supports the
required operations before communication begins.
Fixes: c524fbca672e ("iio: humidity: Add support for ENS210")
Signed-off-by: Salah Triki <salah.triki@xxxxxxxxx>
---
drivers/iio/humidity/ens210.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iio/humidity/ens210.c b/drivers/iio/humidity/ens210.c
index 77418d97f30d..e8633f247b10 100644
--- a/drivers/iio/humidity/ens210.c
+++ b/drivers/iio/humidity/ens210.c
@@ -204,6 +204,8 @@ static int ens210_probe(struct i2c_client *client)
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
I2C_FUNC_SMBUS_WRITE_BYTE |
+ I2C_FUNC_SMBUS_READ_BYTE_DATA |
+ I2C_FUNC_SMBUS_READ_WORD_DATA |
I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
return dev_err_probe(&client->dev, -EOPNOTSUPP,
"adapter does not support some i2c transactions\n");
--
2.43.0