[PATCH 5/8] platform: arm64: qcom-hamoa-ec: Verify required I2C adapter functionality

[Anvesh Jain P]

Check the underlying I2C adapter supports both the raw I2C transfers
used by the fan RPM/LUT commands and the SMBus byte and block-write
transfers used by the other EC commands, and fail probe early with a
clear error if it doesn't.

Signed-off-by: Anvesh Jain P <anvesh.p@xxxxxxxxxxxxxxxx>
---
 drivers/platform/arm64/qcom-hamoa-ec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/platform/arm64/qcom-hamoa-ec.c b/drivers/platform/arm64/qcom-hamoa-ec.c
index d0c45d9970ee..a420a180a194 100644
--- a/drivers/platform/arm64/qcom-hamoa-ec.c
+++ b/drivers/platform/arm64/qcom-hamoa-ec.c
@@ -1195,6 +1195,11 @@ static int qcom_ec_probe(struct i2c_client *client)
 	unsigned int i;
 	int ret;
 
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_WRITE_I2C_BLOCK))
+		return -EOPNOTSUPP;
+
 	ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
 	if (!ec)
 		return -ENOMEM;

-- 
2.34.1