Re: [PATCH v1 2/2] hwmon: pmbus: Add ltc4286 driver

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On 4/25/23 06:45, Andi Shyti wrote:
Hi Delphine,

On top of Guenter's comments,

[...]

+config SENSORS_LTC4286
+	bool "Linear Technologies LTC4286"
+	help
+	  If you say yes here you get hardware monitoring support for Linear
+	  Technology LTC4286.

could you add a couple of words more here?

[...]

+static int ltc4286_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	int ret;
+	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
+	struct device *dev = &client->dev;
+	struct pmbus_driver_info *info;
+	u32 rsense;
+
+	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to read manufacturer id\n");

you can use dev_err_probe() here:

	return dev_err_probe(&client->dev, err, "failed to read manufacturer id\n");

+		return ret;
+	}
+
+	/* Refer to ltc4286 datasheet page 20
+	 * the default manufacturer id is LTC
+	 */
+	if (ret != LTC4286_MFR_ID_SIZE ||
+	    strncmp(block_buffer, "LTC", LTC4286_MFR_ID_SIZE)) {
+		dev_err(&client->dev, "unsupported manufacturer id\n");
+		return -ENODEV;
+	}
+
+	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to read manufacturer model\n");
+		return ret;
+	}

Is this read really needed?


It only makes sense if the returned string is actually validated.
Otherwise no.

Guenter




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