eeprom: ee1004: Check chip before probing

Like other eeprom drivers, check if the device is really there and
functional before probing.

Signed-off-by: Eddie James <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Eddie James

drivers/misc/eeprom/ee1004.c

@@ -304,6 +304,10 @@ static int ee1004_probe(struct i2c_client *client)
 				     I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_READ_BYTE_DATA))
 		return -EPFNOSUPPORT;
 
+	err = i2c_smbus_read_byte(client);
+	if (err < 0)
+		return -ENODEV;
+
 	mutex_lock(&ee1004_bus_lock);
 
 	err = ee1004_init_bus_data(client);