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author | Toshi Kani <toshi.kani@hpe.com> | 2017-08-23 16:54:43 -0600 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-08-29 01:42:48 +0200 |
commit | 5aa5911a0ed9355ebb02f83de4be9ba435a45a2c (patch) | |
tree | df42ef212db1c6944058a5114800a7b2706a27e9 /drivers/acpi/utils.c | |
parent | cc4a41fe5541a73019a864883297bd5043aa6d98 (diff) | |
download | linux-5aa5911a0ed9355ebb02f83de4be9ba435a45a2c.tar.gz linux-5aa5911a0ed9355ebb02f83de4be9ba435a45a2c.tar.bz2 linux-5aa5911a0ed9355ebb02f83de4be9ba435a45a2c.zip |
ACPI / blacklist: add acpi_match_platform_list()
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>
Diffstat (limited to 'drivers/acpi/utils.c')
-rw-r--r-- | drivers/acpi/utils.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index b9d956c916f5..0a9e5979aaa9 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -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); |