From 6552f327cab8eb6c773ba4f702cf6a371d1dc467 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Fri, 27 Feb 2015 08:23:37 -0800 Subject: hwmon: (nct7904) Strengthen detect function The bank register has five unused bits. Verify that those bits are zero to strengthen the detect function. Cc: Vadim V. Vlasov Signed-off-by: Guenter Roeck Reviewed-by: Jean Delvare --- drivers/hwmon/nct7904.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c index eaa8234e21d0..b77b82f24480 100644 --- a/drivers/hwmon/nct7904.c +++ b/drivers/hwmon/nct7904.c @@ -502,7 +502,8 @@ static int nct7904_detect(struct i2c_client *client, /* Determine the chip type. */ if (i2c_smbus_read_byte_data(client, VENDOR_ID_REG) != NUVOTON_ID || i2c_smbus_read_byte_data(client, CHIP_ID_REG) != NCT7904_ID || - (i2c_smbus_read_byte_data(client, DEVICE_ID_REG) & 0xf0) != 0x50) + (i2c_smbus_read_byte_data(client, DEVICE_ID_REG) & 0xf0) != 0x50 || + (i2c_smbus_read_byte_data(client, BANK_SEL_REG) & 0xf8) != 0x00) return -ENODEV; strlcpy(info->type, "nct7904", I2C_NAME_SIZE); -- cgit v1.2.3