hwmon: (jc42) Strengthen detect function

Configuration register bit 5 must read 0 for all JC42.4 compliant chips.
Several capability register bits must be set for all TSE2004 compliant
chips. Use that information to strengthen the detect function.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/jc42.c b/drivers/hwmon/jc42.c
index 1180af1b16387bc74008a903d15cb4703112d1ba..a260cff750a5842a289f7aeb36c2c6cd7b86cab9 100644 (file)
--- a/drivers/hwmon/jc42.c
+++ b/drivers/hwmon/jc42.c
@@ -413,7 +413,11 @@ static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info)
        if (cap < 0 || config < 0 || manid < 0 || devid < 0)
                return -ENODEV;
 
-       if ((cap & 0xff00) || (config & 0xf800))
+       if ((cap & 0xff00) || (config & 0xf820))
+               return -ENODEV;
+
+       if ((devid & TSE2004_DEVID_MASK) == TSE2004_DEVID &&
+           (cap & 0x00e7) != 0x00e7)
                return -ENODEV;
 
        for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) {