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hwmon: (max1619) Improve chip detection code

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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>
This commit is contained in:
Guenter Roeck 2024-07-26 15:29:40 -07:00
parent 13047ebe63
commit 90368fa397
1 changed files with 14 additions and 18 deletions
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32
drivers/hwmon/max1619.c
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@ -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);