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ACPI: Add a generic API for _OSC -v2
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
Len Brown
parent
22763c5cf3
commit
70023de88c
2 changed files with 131 additions and 0 deletions
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@ -344,6 +344,128 @@ bool acpi_bus_can_wakeup(acpi_handle handle)
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EXPORT_SYMBOL(acpi_bus_can_wakeup);
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static void acpi_print_osc_error(acpi_handle handle,
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struct acpi_osc_context *context, char *error)
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{
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
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int i;
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if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
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printk(KERN_DEBUG "%s\n", error);
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else {
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printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
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kfree(buffer.pointer);
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}
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printk(KERN_DEBUG"_OSC request data:");
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for (i = 0; i < context->cap.length; i += sizeof(u32))
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printk("%x ", *((u32 *)(context->cap.pointer + i)));
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printk("\n");
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}
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static u8 hex_val(unsigned char c)
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{
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return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
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}
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static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
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{
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int i;
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static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
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24, 26, 28, 30, 32, 34};
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if (strlen(str) != 36)
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return AE_BAD_PARAMETER;
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for (i = 0; i < 36; i++) {
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if (i == 8 || i == 13 || i == 18 || i == 23) {
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if (str[i] != '-')
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return AE_BAD_PARAMETER;
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} else if (!isxdigit(str[i]))
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return AE_BAD_PARAMETER;
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}
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for (i = 0; i < 16; i++) {
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uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
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uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
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}
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return AE_OK;
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}
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acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
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{
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acpi_status status;
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struct acpi_object_list input;
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union acpi_object in_params[4];
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union acpi_object *out_obj;
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u8 uuid[16];
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u32 errors;
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if (!context)
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return AE_ERROR;
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if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
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return AE_ERROR;
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context->ret.length = ACPI_ALLOCATE_BUFFER;
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context->ret.pointer = NULL;
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/* Setting up input parameters */
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input.count = 4;
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input.pointer = in_params;
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in_params[0].type = ACPI_TYPE_BUFFER;
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in_params[0].buffer.length = 16;
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in_params[0].buffer.pointer = uuid;
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in_params[1].type = ACPI_TYPE_INTEGER;
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in_params[1].integer.value = context->rev;
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in_params[2].type = ACPI_TYPE_INTEGER;
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in_params[2].integer.value = context->cap.length/sizeof(u32);
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in_params[3].type = ACPI_TYPE_BUFFER;
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in_params[3].buffer.length = context->cap.length;
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in_params[3].buffer.pointer = context->cap.pointer;
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status = acpi_evaluate_object(handle, "_OSC", &input, &context->ret);
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if (ACPI_FAILURE(status))
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return status;
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/* return buffer should have the same length as cap buffer */
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if (context->ret.length != context->cap.length)
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return AE_NULL_OBJECT;
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out_obj = context->ret.pointer;
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if (out_obj->type != ACPI_TYPE_BUFFER) {
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acpi_print_osc_error(handle, context,
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"_OSC evaluation returned wrong type");
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status = AE_TYPE;
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goto out_kfree;
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}
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/* Need to ignore the bit0 in result code */
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errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
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if (errors) {
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if (errors & OSC_REQUEST_ERROR)
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acpi_print_osc_error(handle, context,
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"_OSC request failed");
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if (errors & OSC_INVALID_UUID_ERROR)
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acpi_print_osc_error(handle, context,
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"_OSC invalid UUID");
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if (errors & OSC_INVALID_REVISION_ERROR)
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acpi_print_osc_error(handle, context,
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"_OSC invalid revision");
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if (errors & OSC_CAPABILITIES_MASK_ERROR) {
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if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
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& OSC_QUERY_ENABLE)
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goto out_success;
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status = AE_SUPPORT;
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goto out_kfree;
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}
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status = AE_ERROR;
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goto out_kfree;
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}
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out_success:
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return AE_OK;
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out_kfree:
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kfree(context->ret.pointer);
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context->ret.pointer = NULL;
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return status;
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}
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EXPORT_SYMBOL(acpi_run_osc);
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/* --------------------------------------------------------------------------
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Event Management
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-------------------------------------------------------------------------- */
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@ -253,6 +253,13 @@ void __init acpi_old_suspend_ordering(void);
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void __init acpi_s4_no_nvs(void);
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#endif /* CONFIG_PM_SLEEP */
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struct acpi_osc_context {
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char *uuid_str; /* uuid string */
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int rev;
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struct acpi_buffer cap; /* arg2/arg3 */
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struct acpi_buffer ret; /* free by caller if success */
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};
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#define OSC_QUERY_TYPE 0
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#define OSC_SUPPORT_TYPE 1
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#define OSC_CONTROL_TYPE 2
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@ -265,6 +272,8 @@ void __init acpi_s4_no_nvs(void);
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#define OSC_INVALID_REVISION_ERROR 8
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#define OSC_CAPABILITIES_MASK_ERROR 16
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acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
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/* _OSC DW1 Definition (OS Support Fields) */
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#define OSC_EXT_PCI_CONFIG_SUPPORT 1
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#define OSC_ACTIVE_STATE_PWR_SUPPORT 2
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