Re: [PATCH v3] hwmon: Driver for TI TMP103 temperature sensor

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On 06/15/2014 11:47 PM, Heiko Schocher wrote:
Driver for the TI TMP103.

The TI TMP103 is similar to the TMP102.  It differs from the TMP102
by having only 8 bit registers.

Signed-off-by: Heiko Schocher <hs@xxxxxxx>

Hello Heiko,

Almost there.

---

+static int tmp103_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct device *hwmon_dev;
+	struct regmap *regmap;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA)) {
+		dev_err(&client->dev,
+			"adapter doesn't support SMBus byte transactions\n");
+		return -ENODEV;
+	}
+
+	regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "failed to allocate register map\n");
+		return PTR_ERR(regmap);
+	}
+
+	ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG,
+				 TMP103_CONFIG);

You actually want to mask out CR0, CR1, M0, and M1 here.

+	if (ret < 0) {
+		dev_err(&client->dev, "error writing config register\n");
+		return ret;
+	}
+
+	hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
+						      regmap, tmp103_groups);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+#ifdef CONFIG_PM
+static int tmp103_suspend(struct device *dev)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
+
+	return regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONF_SD, 0);
+}
+
+static int tmp103_resume(struct device *dev)
+{
+	struct regmap *regmap = dev_get_drvdata(dev);
+
+	return regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONF_SD,
+				  TMP103_CONF_SD);

That changes {M0, M1} to {1, 1}, but you really want {0, 1} to restore the
pre-suspend configuration.

One solution for both would be to define TMP103_CONFIG_MASK and TMP103_CONF_SD_MASK
separately to ensure you catch all the to-be-cleared bits.

Guenter

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