[PATCH] hwmon: (jc42) Strengthen detect function

[Guenter Roeck <linux@roeck-us.net>]

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>
---
 drivers/hwmon/jc42.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/jc42.c b/drivers/hwmon/jc42.c
index 1180af1b1638..a260cff750a5 100644
--- 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++) {
-- 
2.39.2