hwmon: (adt7475) Improve device detection
Check the value of register 0x3f as part of the device detection, to
make it more robust.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Jordan Crouse <jordan@cosmicpenguin.net>
Cc: "Darrick J. Wong" <djwong@us.ibm.com>
diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
index 20bab51..520773b 100644
--- a/drivers/hwmon/adt7475.c
+++ b/drivers/hwmon/adt7475.c
@@ -47,6 +47,7 @@
#define REG_DEVID 0x3D
#define REG_VENDID 0x3E
+#define REG_DEVID2 0x3F
#define REG_STATUS1 0x41
#define REG_STATUS2 0x42
@@ -1014,18 +1015,22 @@
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
- int vendid, devid;
+ int vendid, devid, devid2;
const char *name;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
vendid = adt7475_read(REG_VENDID);
- devid = adt7475_read(REG_DEVID);
+ devid2 = adt7475_read(REG_DEVID2);
+ if (vendid != 0x41 || /* Analog Devices */
+ (devid2 & 0xf8) != 0x68)
+ return -ENODEV;
- if (vendid == 0x41 && devid == 0x73)
+ devid = adt7475_read(REG_DEVID);
+ if (devid == 0x73)
name = "adt7473";
- else if (vendid == 0x41 && devid == 0x75 && client->addr == 0x2e)
+ else if (devid == 0x75 && client->addr == 0x2e)
name = "adt7475";
else {
dev_dbg(&adapter->dev,