Add an API to execute _OSC. A lot of devices can have this method, so add a
generic API.
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
---
drivers/acpi/bus.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/acpi.h | 9 ++++++
2 files changed, 81 insertions(+)
Index: linux/drivers/acpi/bus.c
===================================================================
--- linux.orig/drivers/acpi/bus.c 2009-10-27 13:50:24.000000000 +0800
+++ linux/drivers/acpi/bus.c 2009-10-27 14:02:30.000000000 +0800
@@ -344,6 +344,78 @@ bool acpi_bus_can_wakeup(acpi_handle han
EXPORT_SYMBOL(acpi_bus_can_wakeup);
+acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
+{
+ acpi_status status;
+ struct acpi_object_list input;
+ union acpi_object in_params[4];
+ union acpi_object *out_obj;
+ u32 errors;
+
+ if (!context)
+ return AE_ERROR;
+ context->ret.length = ACPI_ALLOCATE_BUFFER;
+ context->ret.pointer = NULL;
+
+ /* Setting up input parameters */
+ input.count = 4;
+ input.pointer = in_params;
+ in_params[0].type = ACPI_TYPE_BUFFER;
+ in_params[0].buffer.length = 16;
+ in_params[0].buffer.pointer = context->uuid;
+ in_params[1].type = ACPI_TYPE_INTEGER;
+ in_params[1].integer.value = context->rev;
+ in_params[2].type = ACPI_TYPE_INTEGER;
+ in_params[2].integer.value = context->cap.length/sizeof(u32);
+ in_params[3].type = ACPI_TYPE_BUFFER;
+ in_params[3].buffer.length = context->cap.length;
+ in_params[3].buffer.pointer = context->cap.pointer;
+
+ status = acpi_evaluate_object(handle, "_OSC", &input, &context->ret);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ /* return buffer should have the same length as cap buffer */
+ if (context->ret.length != context->cap.length)
+ return AE_NULL_OBJECT;
+
+ out_obj = context->ret.pointer;
+ if (out_obj->type != ACPI_TYPE_BUFFER) {
+ printk(KERN_DEBUG "_OSC evaluation returned wrong type\n");
+ status = AE_TYPE;
+ goto out_kfree;
+ }
+ /* Need to ignore the bit0 in result code */
+ errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
+ if (errors) {
+ if (errors & OSC_REQUEST_ERROR)
+ printk(KERN_DEBUG "_OSC request failed\n");
+ if (errors & OSC_INVALID_UUID_ERROR)
+ printk(KERN_DEBUG "_OSC invalid UUID\n");
+ if (errors & OSC_INVALID_REVISION_ERROR)
+ printk(KERN_DEBUG "_OSC invalid revision\n");
+ if (errors & OSC_CAPABILITIES_MASK_ERROR) {
+ if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
+ & OSC_QUERY_ENABLE)
+ goto out_success;
+ printk(KERN_DEBUG
+ "Firmware did not grant requested _OSC control\n");
+ status = AE_SUPPORT;
+ goto out_kfree;
+ }
+ status = AE_ERROR;
+ goto out_kfree;
+ }
+out_success:
+ return AE_OK;
+
+out_kfree:
+ kfree(context->ret.pointer);
+ context->ret.pointer = NULL;
+ return status;
+}
+EXPORT_SYMBOL(acpi_run_osc);
+
/* --------------------------------------------------------------------------
Event Management
-------------------------------------------------------------------------- */
Index: linux/include/linux/acpi.h
===================================================================
--- linux.orig/include/linux/acpi.h 2009-10-27 13:50:24.000000000 +0800
+++ linux/include/linux/acpi.h 2009-10-27 13:50:35.000000000 +0800
@@ -253,6 +253,13 @@ void __init acpi_old_suspend_ordering(vo
void __init acpi_s4_no_nvs(void);
#endif /* CONFIG_PM_SLEEP */
+struct acpi_osc_context {
+ u8 *uuid;
+ int rev;
+ struct acpi_buffer cap; /* arg2/arg3 */
+ struct acpi_buffer ret; /* free by caller if success */
+};
+
#define OSC_QUERY_TYPE 0
#define OSC_SUPPORT_TYPE 1
#define OSC_CONTROL_TYPE 2
@@ -265,6 +272,8 @@ void __init acpi_s4_no_nvs(void);
#define OSC_INVALID_REVISION_ERROR 8
#define OSC_CAPABILITIES_MASK_ERROR 16
+acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
+
/* _OSC DW1 Definition (OS Support Fields) */
#define OSC_EXT_PCI_CONFIG_SUPPORT 1
#define OSC_ACTIVE_STATE_PWR_SUPPORT 2
--
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