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PNP: add interface to retrieve ACPI device from a PNPACPI device

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Add pnp_acpi_device(pnp_dev), which takes a PNP device and returns the
associated ACPI device (or NULL, if the device is not a PNPACPI device).

This allows us to write a PNP driver that can manage both traditional
PNPBIOS and ACPI devices, treating ACPI-only functionality as an optional
extension.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2009-11-17 17:05:19 -07:00 committed by Len Brown
parent c4da6940a7
commit 9065ce4500
2 changed files with 15 additions and 1 deletions
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3
drivers/pnp/pnpacpi/core.c
View file

@ -144,7 +144,7 @@ static int pnpacpi_resume(struct pnp_dev *dev)
}
#endif
static struct pnp_protocol pnpacpi_protocol = {
struct pnp_protocol pnpacpi_protocol = {
.name = "Plug and Play ACPI",
.get = pnpacpi_get_resources,
.set = pnpacpi_set_resources,
@ -154,6 +154,7 @@ static struct pnp_protocol pnpacpi_protocol = {
.resume = pnpacpi_resume,
#endif
};
EXPORT_SYMBOL(pnpacpi_protocol);
static int __init pnpacpi_add_device(struct acpi_device *device)
{

13
include/linux/pnp.h
View file

@ -334,6 +334,19 @@ extern struct pnp_protocol pnpbios_protocol;
#define pnp_device_is_pnpbios(dev) 0
#endif
#ifdef CONFIG_PNPACPI
extern struct pnp_protocol pnpacpi_protocol;
static inline struct acpi_device *pnp_acpi_device(struct pnp_dev *dev)
{
if (dev->protocol == &pnpacpi_protocol)
return dev->data;
return NULL;
}
#else
#define pnp_acpi_device(dev) 0
#endif
/* status */
#define PNP_READY 0x0000
#define PNP_ATTACHED 0x0001