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ACPI / scan: Add a scan handler for PRP0001 

If the special PRP0001 device ID is present in the given device's list
of ACPI/PNP IDs and the device has a valid "compatible" property in
the _DSD, it should be enumerated using the default mechanism,
unless some scan handlers match the IDs preceding PRP0001 in the
device's list of ACPI/PNP IDs.  In addition to that, no scan handlers
matching the IDs following PRP0001 in that list should be attached
to the device.

To make that happen, define a scan handler that will match PRP0001
and trigger the default enumeration for the matching devices if the
"compatible" property is present for them.

Since that requires the check for platform_id and device->handler
to be removed from acpi_default_enumeration(), move the fallback
invocation of acpi_default_enumeration() to acpi_bus_attach()
(after it's checked if there's a matching ACPI driver for the
device), which is a better place to call it, and do the platform_id
check in there too (device->handler is guaranteed to be unset at
the point where the function is looking for a matching ACPI driver).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Darren Hart <dvhart@linux.intel.com>
This commit is contained in:
Rafael J. Wysocki 2015-04-24 02:18:01 +02:00
parent 4c533c801d
commit 7d284352f9
1 changed files with 28 additions and 5 deletions
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33
drivers/acpi/scan.c
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@ -2392,9 +2392,6 @@ static void acpi_default_enumeration(struct acpi_device *device)
struct list_head resource_list;
bool is_spi_i2c_slave = false;
if (!device->pnp.type.platform_id || device->handler)
return;
/*
* Do not enemerate SPI/I2C slaves as they will be enuerated by their
* respective parents.
@ -2407,6 +2404,29 @@ static void acpi_default_enumeration(struct acpi_device *device)
acpi_create_platform_device(device);
}
static const struct acpi_device_id generic_device_ids[] = {
{"PRP0001", },
{"", },
};
static int acpi_generic_device_attach(struct acpi_device *adev,
const struct acpi_device_id *not_used)
{
/*
* Since PRP0001 is the only ID handled here, the test below can be
* unconditional.
*/
if (adev->data.of_compatible)
acpi_default_enumeration(adev);
return 1;
}
static struct acpi_scan_handler generic_device_handler = {
.ids = generic_device_ids,
.attach = acpi_generic_device_attach,
};
static int acpi_scan_attach_handler(struct acpi_device *device)
{
struct acpi_hardware_id *hwid;
@ -2432,8 +2452,6 @@ static int acpi_scan_attach_handler(struct acpi_device *device)
break;
}
}
if (!ret)
acpi_default_enumeration(device);
return ret;
}
@ -2475,6 +2493,9 @@ static void acpi_bus_attach(struct acpi_device *device)
ret = device_attach(&device->dev);
if (ret < 0)
return;
if (!ret && device->pnp.type.platform_id)
acpi_default_enumeration(device);
}
device->flags.visited = true;
@ -2633,6 +2654,8 @@ int __init acpi_scan_init(void)
acpi_pnp_init();
acpi_int340x_thermal_init();
acpi_scan_add_handler(&generic_device_handler);
mutex_lock(&acpi_scan_lock);
/*
* Enumerate devices in the ACPI namespace.