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hwmon: (jc42) Don't reset hysteresis on device removal 

Restoring the configuration register on device removal has the side
effect of also resetting the hysteresis value. This is inconsistent as
the other limits are not reset, only hysteresis. So, following the
principle of least surprise, preserve the hysteresis value when
restoring the configuration register.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Jean Delvare 2012-07-26 22:18:43 +02:00 committed by Guenter Roeck
parent 2ccc8731e5
commit 5953e2761b
1 changed files with 10 additions and 3 deletions
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13
drivers/hwmon/jc42.c
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@ -534,9 +534,16 @@ static int jc42_remove(struct i2c_client *client)
struct jc42_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &jc42_group);
if (data->config != data->orig_config)
i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG,
data->orig_config);
/* Restore original configuration except hysteresis */
if ((data->config & ~JC42_CFG_HYST_MASK) !=
(data->orig_config & ~JC42_CFG_HYST_MASK)) {
int config;
config = (data->orig_config & ~JC42_CFG_HYST_MASK)
| (data->config & JC42_CFG_HYST_MASK);
i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
}
return 0;
}