Commit d656b6fd authored by Jean Delvare's avatar Jean Delvare
Browse files

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: default avatarJean 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>
parent 54ecb9e3

drivers/hwmon/adt7475.c

+9 −4
Original line number Diff line number Diff line
@@ -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 @@ static int adt7475_detect(struct i2c_client *client, int kind, 
			  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,