1 files changed, 28 insertions, 10 deletions

diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
index 0da695d800c5..8013895a1faf 100644
--- a/drivers/hwmon/tmp102.c
+++ b/drivers/hwmon/tmp102.c
@@ -50,6 +50,7 @@
 struct tmp102 {
 	struct device *hwmon_dev;
 	struct mutex lock;
+	u16 config_orig;
 	unsigned long last_update;
 	int temp[3];
 };
@@ -177,21 +178,27 @@ static int __devinit tmp102_probe(struct i2c_client *client,
 	}
 	i2c_set_clientdata(client, tmp102);
 
+	status = tmp102_read_reg(client, TMP102_CONF_REG);
+	if (status < 0) {
+		dev_err(&client->dev, "error reading config register\n");
+		goto fail_free;
+	}
+	tmp102->config_orig = status;
 	status = tmp102_write_reg(client, TMP102_CONF_REG, TMP102_CONFIG);
 	if (status < 0) {
 		dev_err(&client->dev, "error writing config register\n");
-		goto fail0;
+		goto fail_restore_config;
 	}
 	status = tmp102_read_reg(client, TMP102_CONF_REG);
 	if (status < 0) {
 		dev_err(&client->dev, "error reading config register\n");
-		goto fail0;
+		goto fail_restore_config;
 	}
 	status &= ~TMP102_CONFIG_RD_ONLY;
 	if (status != TMP102_CONFIG) {
 		dev_err(&client->dev, "config settings did not stick\n");
 		status = -ENODEV;
-		goto fail0;
+		goto fail_restore_config;
 	}
 	tmp102->last_update = jiffies - HZ;
 	mutex_init(&tmp102->lock);
@@ -199,21 +206,24 @@ static int __devinit tmp102_probe(struct i2c_client *client,
 	status = sysfs_create_group(&client->dev.kobj, &tmp102_attr_group);
 	if (status) {
 		dev_dbg(&client->dev, "could not create sysfs files\n");
-		goto fail0;
+		goto fail_restore_config;
 	}
 	tmp102->hwmon_dev = hwmon_device_register(&client->dev);
 	if (IS_ERR(tmp102->hwmon_dev)) {
 		dev_dbg(&client->dev, "unable to register hwmon device\n");
 		status = PTR_ERR(tmp102->hwmon_dev);
-		goto fail1;
+		goto fail_remove_sysfs;
 	}
 
 	dev_info(&client->dev, "initialized\n");
 
 	return 0;
-fail1:
+
+fail_remove_sysfs:
 	sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
-fail0:
+fail_restore_config:
+	tmp102_write_reg(client, TMP102_CONF_REG, tmp102->config_orig);
+fail_free:
 	i2c_set_clientdata(client, NULL);
 	kfree(tmp102);
 
@@ -224,11 +234,19 @@ static int __devexit tmp102_remove(struct i2c_client *client)
 {
 	struct tmp102 *tmp102 = i2c_get_clientdata(client);
 
-	/* shutdown the chip */
-	tmp102_write_reg(client, TMP102_CONF_REG, TMP102_CONF_SD);
-
 	hwmon_device_unregister(tmp102->hwmon_dev);
 	sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
+
+	/* Stop monitoring if device was stopped originally */
+	if (tmp102->config_orig & TMP102_CONF_SD) {
+		int config;
+
+		config = tmp102_read_reg(client, TMP102_CONF_REG);
+		if (config >= 0)
+			tmp102_write_reg(client, TMP102_CONF_REG,
+					 config | TMP102_CONF_SD);
+	}
+
 	i2c_set_clientdata(client, NULL);
 	kfree(tmp102);