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ACPI: Add a generic API for _OSC -v2

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v2->v1:
.improve debug info as suggedted by Bjorn,Kenji
.API is using uuid string as suggested by Alexey

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@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Shaohua Li 2009-10-29 11:04:28 +08:00 committed by Len Brown
parent 22763c5cf3
commit 70023de88c
2 changed files with 131 additions and 0 deletions
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122
drivers/acpi/bus.c
View File

@ -344,6 +344,128 @@ bool acpi_bus_can_wakeup(acpi_handle handle)
EXPORT_SYMBOL(acpi_bus_can_wakeup);
static void acpi_print_osc_error(acpi_handle handle,
struct acpi_osc_context *context, char *error)
{
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
int i;
if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
printk(KERN_DEBUG "%s\n", error);
else {
printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
kfree(buffer.pointer);
}
printk(KERN_DEBUG"_OSC request data:");
for (i = 0; i < context->cap.length; i += sizeof(u32))
printk("%x ", *((u32 *)(context->cap.pointer + i)));
printk("\n");
}
static u8 hex_val(unsigned char c)
{
return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
}
static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
{
int i;
static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
24, 26, 28, 30, 32, 34};
if (strlen(str) != 36)
return AE_BAD_PARAMETER;
for (i = 0; i < 36; i++) {
if (i == 8 || i == 13 || i == 18 || i == 23) {
if (str[i] != '-')
return AE_BAD_PARAMETER;
} else if (!isxdigit(str[i]))
return AE_BAD_PARAMETER;
}
for (i = 0; i < 16; i++) {
uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
}
return AE_OK;
}
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;
u8 uuid[16];
u32 errors;
if (!context)
return AE_ERROR;
if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
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 = 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) {
acpi_print_osc_error(handle, context,
"_OSC evaluation returned wrong type");
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)
acpi_print_osc_error(handle, context,
"_OSC request failed");
if (errors & OSC_INVALID_UUID_ERROR)
acpi_print_osc_error(handle, context,
"_OSC invalid UUID");
if (errors & OSC_INVALID_REVISION_ERROR)
acpi_print_osc_error(handle, context,
"_OSC invalid revision");
if (errors & OSC_CAPABILITIES_MASK_ERROR) {
if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
& OSC_QUERY_ENABLE)
goto out_success;
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
-------------------------------------------------------------------------- */

9
include/linux/acpi.h
View File

@ -253,6 +253,13 @@ void __init acpi_old_suspend_ordering(void);
void __init acpi_s4_no_nvs(void);
#endif /* CONFIG_PM_SLEEP */
struct acpi_osc_context {
char *uuid_str; /* uuid string */
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