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>
diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
index 0da695d..8013895 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 @@
}
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 @@
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 @@
{
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);