diff options
| -rw-r--r-- | drivers/hwmon/tmp102.c | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c index 0da695d800c..8013895a1fa 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); |