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platform/surface: aggregator: Allow is_ssam_device() to be used when CONFIG_SURFACE_AGGREGATOR_BUS is disabled

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In SSAM subsystem drivers that handle both ACPI and SSAM-native client
devices, we may want to check whether we have a SSAM (native) client
device. Further, we may want to do this even when instantiation thereof
cannot happen due to CONFIG_SURFACE_AGGREGATOR_BUS=n. Currently, doing
so causes an error due to an undefined reference error due to
ssam_device_type being placed in the bus source unit.

Therefore, if CONFIG_SURFACE_AGGREGATOR_BUS is not defined, simply let
is_ssam_device() return false to prevent this error.

Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20220527023447.2460025-2-luzmaximilian@gmail.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Maximilian Luz 2022-05-27 04:34:36 +02:00 committed by Hans de Goede
parent 50d88b1d1e
commit 0eb6584068
1 changed files with 11 additions and 0 deletions
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11
include/linux/surface_aggregator/device.h
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@ -177,6 +177,8 @@ struct ssam_device_driver {
void (*remove)(struct ssam_device *sdev);
};
#ifdef CONFIG_SURFACE_AGGREGATOR_BUS
extern struct bus_type ssam_bus_type;
extern const struct device_type ssam_device_type;
@ -193,6 +195,15 @@ static inline bool is_ssam_device(struct device *d)
return d->type == &ssam_device_type;
}
#else /* CONFIG_SURFACE_AGGREGATOR_BUS */
static inline bool is_ssam_device(struct device *d)
{
return false;
}
#endif /* CONFIG_SURFACE_AGGREGATOR_BUS */
/**
* to_ssam_device() - Casts the given device to a SSAM client device.
* @d: The device to cast.