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ACPI: utils: Add acpi_evaluate_reg() helper 

With a recent fix to the pinctrl-cherryview driver we now have
2 drivers open-coding the parameter building / passing for calling
_REG on an ACPI handle.

Add a helper for this, so that these 2 drivers can be converted to this
helper.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2020-05-07 12:49:16 +02:00 committed by Rafael J. Wysocki
parent 0e698dfa28
commit 132565d8ec
2 changed files with 26 additions and 0 deletions
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25
drivers/acpi/utils.c
View File

@ -605,6 +605,31 @@ acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
return status;
}
/**
* acpi_evaluate_reg: Evaluate _REG method to register OpRegion presence
* @handle: ACPI device handle
* @space_id: ACPI address space id to register OpRegion presence for
* @function: Parameter to pass to _REG one of ACPI_REG_CONNECT or
* ACPI_REG_DISCONNECT
*
* Evaluate device's _REG method to register OpRegion presence.
*/
acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function)
{
struct acpi_object_list arg_list;
union acpi_object params[2];
params[0].type = ACPI_TYPE_INTEGER;
params[0].integer.value = space_id;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = function;
arg_list.count = 2;
arg_list.pointer = params;
return acpi_evaluate_object(handle, "_REG", &arg_list, NULL);
}
EXPORT_SYMBOL(acpi_evaluate_reg);
/**
* acpi_evaluate_dsm - evaluate device's _DSM method
* @handle: ACPI device handle

1
include/acpi/acpi_bus.h
View File

@ -44,6 +44,7 @@ acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
u64 arg);
acpi_status acpi_evaluate_ej0(acpi_handle handle);
acpi_status acpi_evaluate_lck(acpi_handle handle, int lock);
acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function);
bool acpi_ata_match(acpi_handle handle);
bool acpi_bay_match(acpi_handle handle);
bool acpi_dock_match(acpi_handle handle);