diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2024-07-26 15:29:40 -0700 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2024-07-31 10:43:53 -0700 |
| commit | 90368fa3978fee3a5df5cbee3312e3fe51f7a8c5 (patch) | |
| tree | c685badf3f1bcc911afcf1b89cad9aa268ccfbe6 /drivers/hwmon/max1619.c | |
| parent | 13047ebe63a8b4ffabbb97ec6edc8c7dcdb96cee (diff) | |
hwmon: (max1619) Improve chip detection code
Bail out immediately if reading any of the registers used for chip
detection fails, or if it returns an unexpected value. Drop all log
messages from detection code.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/max1619.c')
| -rw-r--r-- | drivers/hwmon/max1619.c | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/drivers/hwmon/max1619.c b/drivers/hwmon/max1619.c index 72e17afb22f0..9b6d03cff4df 100644 --- a/drivers/hwmon/max1619.c +++ b/drivers/hwmon/max1619.c @@ -260,31 +260,27 @@ static int max1619_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; - u8 reg_config, reg_convrate, reg_status, man_id, chip_id; + int regval; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -ENODEV; - /* detection */ - reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_CONFIG); - reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_CONVRATE); - reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_STATUS); - if ((reg_config & 0x03) != 0x00 - || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) { - dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n", - client->addr); + regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONFIG); + if (regval < 0 || (regval & 0x03)) + return -ENODEV; + regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONVRATE); + if (regval < 0 || regval > 0x07) + return -ENODEV; + regval = i2c_smbus_read_byte_data(client, MAX1619_REG_STATUS); + if (regval < 0 || (regval & 0x61)) return -ENODEV; - } - /* identification */ - man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_MAN_ID); - chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_CHIP_ID); - if (man_id != 0x4D || chip_id != 0x04) { - dev_info(&adapter->dev, - "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n", - man_id, chip_id); + regval = i2c_smbus_read_byte_data(client, MAX1619_REG_MAN_ID); + if (regval != 0x4d) + return -ENODEV; + regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CHIP_ID); + if (regval != 0x04) return -ENODEV; - } strscpy(info->type, "max1619", I2C_NAME_SIZE); |