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msi-wmi: rework init

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There should be less code duplication with usage of gotos
Driver won't load if there's no hardware to control
Safer error handling at input driver allocation

Signed-off-by: Anisse Astier <anisse@astier.eu>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Anisse Astier 2009-12-10 14:18:15 +01:00 committed by Len Brown
parent addd65aac7
commit 46b51eb9e1
1 changed files with 34 additions and 28 deletions
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40
drivers/platform/x86/msi-wmi.c
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@ -284,6 +284,8 @@ static int __init msi_wmi_input_setup(void)
int err;
msi_wmi_input_dev = input_allocate_device();
if (!msi_wmi_input_dev)
return -ENOMEM;
msi_wmi_input_dev->name = "MSI WMI hotkeys";
msi_wmi_input_dev->phys = "wmi/input0";
@ -314,40 +316,44 @@ static int __init msi_wmi_init(void)
{
int err;
if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {
printk(KERN_ERR
"This machine doesn't have MSI-hotkeys through WMI\n");
return -ENODEV;
}
err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
msi_wmi_notify, NULL);
if (err)
return -EINVAL;
err = msi_wmi_input_setup();
if (err) {
wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
return -EINVAL;
}
if (err)
goto err_uninstall_notifier;
if (!acpi_video_backlight_support()) {
backlight = backlight_device_register(DRV_NAME,
NULL, NULL, &msi_backlight_ops);
if (IS_ERR(backlight)) {
wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
input_unregister_device(msi_wmi_input_dev);
return -EINVAL;
}
if (IS_ERR(backlight))
goto err_free_input;
backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
err = bl_get(NULL);
if (err < 0) {
wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
input_unregister_device(msi_wmi_input_dev);
backlight_device_unregister(backlight);
return -EINVAL;
}
if (err < 0)
goto err_free_backlight;
backlight->props.brightness = err;
}
}
printk(KERN_INFO DRV_PFX "Event handler installed\n");
return 0;
err_free_backlight:
backlight_device_unregister(backlight);
err_free_input:
input_unregister_device(msi_wmi_input_dev);
err_uninstall_notifier:
wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
return err;
}
static void __exit msi_wmi_exit(void)