[PATCH v2] iio: humidity: ens210: Fix missing I2C functionality checks

[Salah Triki <salah.triki@gmail.com>]

The ENS210 driver uses SMBus transactions (such as byte, word, and block
data reads/writes) during the probe and measurement phases. However, the
initial functionality check only validated a subset of these capabilities,
which could lead to loading failures on adapters requiring SMBus
emulation or native-only controllers.

To ensure compatibility across a wide range of I2C adapters, modify the
functionality check to verify if the adapter supports the required native
operations or, failing that, supports the SMBus emulation layer.

Fixes: c524fbca672e ("iio: humidity: Add support for ENS210")
Signed-off-by: Salah Triki <salah.triki@gmail.com>
---
 drivers/iio/humidity/ens210.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/humidity/ens210.c b/drivers/iio/humidity/ens210.c
index 77418d97f30d..c722087bc188 100644
--- a/drivers/iio/humidity/ens210.c
+++ b/drivers/iio/humidity/ens210.c
@@ -202,9 +202,12 @@ static int ens210_probe(struct i2c_client *client)
 	int ret;
 
 	if (!i2c_check_functionality(client->adapter,
-				     I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
-				     I2C_FUNC_SMBUS_WRITE_BYTE |
-				     I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
+				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) &&
+			!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL)) {
 		return dev_err_probe(&client->dev, -EOPNOTSUPP,
 			"adapter does not support some i2c transactions\n");
 	}
-- 
2.43.0