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platform/x86: wmi: introduce helper to generate method names

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Instead of "manually" constructing the ACPI method name and
hard-coding sizes in WMI functions, introduce a helper method
which generates the method name for an arbitrary WMI block.

Furthermore, save the appropriate buffer size into a macro.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Link: https://lore.kernel.org/r/20210904175450.156801-28-pobrn@protonmail.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Barnabás Pőcze 2021-09-04 17:56:35 +00:00 committed by Hans de Goede
parent e7b2e33449
commit 57f2ce8921
1 changed files with 27 additions and 15 deletions
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42
drivers/platform/x86/wmi.c
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@ -195,6 +195,22 @@ static acpi_status wmi_method_enable(struct wmi_block *wblock, bool enable)
return status;
}
#define WMI_ACPI_METHOD_NAME_SIZE 5
static inline void get_acpi_method_name(const struct wmi_block *wblock,
const char method,
char buffer[static WMI_ACPI_METHOD_NAME_SIZE])
{
static_assert(ARRAY_SIZE(wblock->gblock.object_id) == 2);
static_assert(WMI_ACPI_METHOD_NAME_SIZE >= 5);
buffer[0] = 'W';
buffer[1] = method;
buffer[2] = wblock->gblock.object_id[0];
buffer[3] = wblock->gblock.object_id[1];
buffer[4] = '\0';
}
/*
* Exported WMI functions
*/
@ -257,7 +273,7 @@ acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance, u32 met
acpi_handle handle;
struct acpi_object_list input;
union acpi_object params[3];
char method[5] = "WM";
char method[WMI_ACPI_METHOD_NAME_SIZE];
wblock = container_of(wdev, struct wmi_block, dev);
block = &wblock->gblock;
@ -288,7 +304,7 @@ acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance, u32 met
params[2].buffer.pointer = in->pointer;
}
strncat(method, block->object_id, 2);
get_acpi_method_name(wblock, 'M', method);
return acpi_evaluate_object(handle, method, &input, out);
}
@ -302,8 +318,8 @@ static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
acpi_status status, wc_status = AE_ERROR;
struct acpi_object_list input;
union acpi_object wq_params[1];
char method[5];
char wc_method[5] = "WC";
char wc_method[WMI_ACPI_METHOD_NAME_SIZE];
char method[WMI_ACPI_METHOD_NAME_SIZE];
if (!out)
return AE_BAD_PARAMETER;
@ -331,7 +347,7 @@ static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
* enable collection.
*/
if (block->flags & ACPI_WMI_EXPENSIVE) {
strncat(wc_method, block->object_id, 2);
get_acpi_method_name(wblock, 'C', wc_method);
/*
* Some GUIDs break the specification by declaring themselves
@ -341,9 +357,7 @@ static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
wc_status = acpi_execute_simple_method(handle, wc_method, 1);
}
strcpy(method, "WQ");
strncat(method, block->object_id, 2);
get_acpi_method_name(wblock, 'Q', method);
status = acpi_evaluate_object(handle, method, &input, out);
/*
@ -415,7 +429,7 @@ acpi_status wmi_set_block(const char *guid_string, u8 instance,
acpi_handle handle;
struct acpi_object_list input;
union acpi_object params[2];
char method[5] = "WS";
char method[WMI_ACPI_METHOD_NAME_SIZE];
if (!guid_string || !in)
return AE_BAD_DATA;
@ -446,7 +460,7 @@ acpi_status wmi_set_block(const char *guid_string, u8 instance,
params[1].buffer.length = in->length;
params[1].buffer.pointer = in->pointer;
strncat(method, block->object_id, 2);
get_acpi_method_name(wblock, 'S', method);
return acpi_evaluate_object(handle, method, &input, NULL);
}
@ -1040,7 +1054,7 @@ static int wmi_create_device(struct device *wmi_bus_dev,
struct acpi_device *device)
{
struct acpi_device_info *info;
char method[5];
char method[WMI_ACPI_METHOD_NAME_SIZE];
int result;
if (wblock->gblock.flags & ACPI_WMI_EVENT) {
@ -1059,8 +1073,7 @@ static int wmi_create_device(struct device *wmi_bus_dev,
* required per the WMI documentation. If it is not present,
* we ignore this data block.
*/
strcpy(method, "WQ");
strncat(method, wblock->gblock.object_id, 2);
get_acpi_method_name(wblock, 'Q', method);
result = get_subobj_info(device->handle, method, &info);
if (result) {
@ -1087,8 +1100,7 @@ static int wmi_create_device(struct device *wmi_bus_dev,
kfree(info);
strcpy(method, "WS");
strncat(method, wblock->gblock.object_id, 2);
get_acpi_method_name(wblock, 'S', method);
result = get_subobj_info(device->handle, method, NULL);
if (result == 0)