Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 70023de8 authored by Shaohua Li's avatar Shaohua Li Committed by Len Brown
Browse files

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: default avatarShaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 22763c5c

drivers/acpi/bus.c

+122 −0
Original line number Original line Diff line number Diff line
@@ -344,6 +344,128 @@ bool acpi_bus_can_wakeup(acpi_handle handle) 




EXPORT_SYMBOL(acpi_bus_can_wakeup);

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

                                Event Management

   -------------------------------------------------------------------------- */

   -------------------------------------------------------------------------- */

include/linux/acpi.h

+9 −0
Original line number Original line Diff line number Diff line
@@ -253,6 +253,13 @@ void __init acpi_old_suspend_ordering(void); 
void __init acpi_s4_no_nvs(void);

void __init acpi_s4_no_nvs(void);

#endif /* CONFIG_PM_SLEEP */

#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_QUERY_TYPE			0

#define OSC_SUPPORT_TYPE 		1

#define OSC_SUPPORT_TYPE 		1

#define OSC_CONTROL_TYPE		2

#define OSC_CONTROL_TYPE		2
@@ -265,6 +272,8 @@ void __init acpi_s4_no_nvs(void); 
#define OSC_INVALID_REVISION_ERROR	8

#define OSC_INVALID_REVISION_ERROR	8

#define OSC_CAPABILITIES_MASK_ERROR	16

#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) */

/* _OSC DW1 Definition (OS Support Fields) */

#define OSC_EXT_PCI_CONFIG_SUPPORT		1

#define OSC_EXT_PCI_CONFIG_SUPPORT		1

#define OSC_ACTIVE_STATE_PWR_SUPPORT 		2

#define OSC_ACTIVE_STATE_PWR_SUPPORT 		2