From 38806bda6b7c8473c47a967a514260c1a1c32c2e Mon Sep 17 00:00:00 2001
From: Jean Delvare <khali@linux-fr.org>
Date: Thu, 27 May 2010 19:58:59 +0200
Subject: [PATCH] hwmon: (tmp102) Don't always stop chip at exit

Only stop the chip at driver exit if it was stopped when driver was
loaded. Leave it running otherwise.

Also restore the device configuration if probe failed, to not leave
the system in a dangling state.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Steven King <sfking@fdwdc.com>
---
 drivers/hwmon/tmp102.c | 38 ++++++++++++++++++++++++++++----------
 1 file 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);
 
-- 
2.20.1