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ACPI / blacklist: add acpi_match_platform_list()

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ACPI OEM ID / OEM Table ID / Revision can be used to identify
a platform based on ACPI firmware info.  acpi_blacklisted(),
intel_pstate_platform_pwr_mgmt_exists(), and some other funcs,
have been using similar check to detect a list of platforms
that require special handlings.

Move the platform check in acpi_blacklisted() to a new common
utility function, acpi_match_platform_list(), so that other
drivers do not have to implement their own version.

There is no change in functionality.

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Toshi Kani
2017-08-23 16:54:43 -06:00
committed by Rafael J. Wysocki
parent cc4a41fe55
commit 5aa5911a0e
3 changed files with 69 additions and 69 deletions
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36
drivers/acpi/utils.c
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@@ -816,3 +816,39 @@ static int __init acpi_backlight(char *str)
return 1;
}
__setup("acpi_backlight=", acpi_backlight);
/**
* acpi_match_platform_list - Check if the system matches with a given list
* @plat: pointer to acpi_platform_list table terminated by a NULL entry
*
* Return the matched index if the system is found in the platform list.
* Otherwise, return a negative error code.
*/
int acpi_match_platform_list(const struct acpi_platform_list *plat)
{
struct acpi_table_header hdr;
int idx = 0;
if (acpi_disabled)
return -ENODEV;
for (; plat->oem_id[0]; plat++, idx++) {
if (ACPI_FAILURE(acpi_get_table_header(plat->table, 0, &hdr)))
continue;
if (strncmp(plat->oem_id, hdr.oem_id, ACPI_OEM_ID_SIZE))
continue;
if (strncmp(plat->oem_table_id, hdr.oem_table_id, ACPI_OEM_TABLE_ID_SIZE))
continue;
if ((plat->pred == all_versions) ||
(plat->pred == less_than_or_equal && hdr.oem_revision <= plat->oem_revision) ||
(plat->pred == greater_than_or_equal && hdr.oem_revision >= plat->oem_revision) ||
(plat->pred == equal && hdr.oem_revision == plat->oem_revision))
return idx;
}
return -ENODEV;
}
EXPORT_SYMBOL(acpi_match_platform_list);