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platform/x86: wmi: Add a new interface to read block data

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wmi_query_block is unnecessarily indirect. Add a straightforward
method for wmi bus drivers to use to read block data.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Mario Limonciello <mario_limonciello@dell.com>
Cc: Pali Rohár <pali.rohar@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: platform-driver-x86@vger.kernel.org
Cc: linux-acpi@vger.kernel.org
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
This commit is contained in:
Andy Lutomirski 2015-11-25 18:19:26 -08:00 committed by Darren Hart (VMware)
parent 1686f54445
commit 56a370259d
2 changed files with 42 additions and 16 deletions
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54
drivers/platform/x86/wmi.c
View File

@ -244,19 +244,10 @@ u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
}
EXPORT_SYMBOL_GPL(wmi_evaluate_method);
/**
* wmi_query_block - Return contents of a WMI block
* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
* @instance: Instance index
* &out: Empty buffer to return the contents of the data block to
*
* Return the contents of an ACPI-WMI data block to a buffer
*/
acpi_status wmi_query_block(const char *guid_string, u8 instance,
struct acpi_buffer *out)
static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
struct acpi_buffer *out)
{
struct guid_block *block = NULL;
struct wmi_block *wblock = NULL;
acpi_handle handle;
acpi_status status, wc_status = AE_ERROR;
struct acpi_object_list input;
@ -264,12 +255,9 @@ struct acpi_buffer *out)
char method[5];
char wc_method[5] = "WC";
if (!guid_string || !out)
if (!out)
return AE_BAD_PARAMETER;
if (!find_guid(guid_string, &wblock))
return AE_ERROR;
block = &wblock->gblock;
handle = wblock->acpi_device->handle;
@ -320,8 +308,42 @@ struct acpi_buffer *out)
return status;
}
/**
* wmi_query_block - Return contents of a WMI block (deprecated)
* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
* @instance: Instance index
* &out: Empty buffer to return the contents of the data block to
*
* Return the contents of an ACPI-WMI data block to a buffer
*/
acpi_status wmi_query_block(const char *guid_string, u8 instance,
struct acpi_buffer *out)
{
struct wmi_block *wblock;
if (!guid_string)
return AE_BAD_PARAMETER;
if (!find_guid(guid_string, &wblock))
return AE_ERROR;
return __query_block(wblock, instance, out);
}
EXPORT_SYMBOL_GPL(wmi_query_block);
union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance)
{
struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev);
if (ACPI_FAILURE(__query_block(wblock, instance, &out)))
return NULL;
return (union acpi_object *)out.pointer;
}
EXPORT_SYMBOL_GPL(wmidev_block_query);
/**
* wmi_set_block - Write to a WMI block
* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
@ -331,7 +353,7 @@ EXPORT_SYMBOL_GPL(wmi_query_block);
* Write the contents of the input buffer to an ACPI-WMI data block
*/
acpi_status wmi_set_block(const char *guid_string, u8 instance,
const struct acpi_buffer *in)
const struct acpi_buffer *in)
{
struct guid_block *block = NULL;
struct wmi_block *wblock = NULL;

4
include/linux/wmi.h
View File

@ -29,6 +29,10 @@ struct wmi_device {
bool readable, writeable;
};
/* Caller must kfree the result. */
extern union acpi_object *wmidev_block_query(struct wmi_device *wdev,
u8 instance);
struct wmi_device_id {
const char *guid_string;
};