scan.c

来自「linux 内核源代码」· C语言 代码 · 共 1,500 行 · 第 1/3 页

 * @device: the device to add and initialize
 * @driver: driver for the device
 *
 * Used to initialize a device via its device driver.  Called whenever a 
 * driver is bound to a device.  Invokes the driver's add() ops.
 */
static int
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
{
	int result = 0;


	if (!device || !driver)
		return -EINVAL;

	if (!driver->ops.add)
		return -ENOSYS;

	result = driver->ops.add(device);
	if (result) {
		device->driver = NULL;
		acpi_driver_data(device) = NULL;
		return result;
	}

	device->driver = driver;

	/*
	 * TBD - Configuration Management: Assign resources to device based
	 * upon possible configuration and currently allocated resources.
	 */

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver successfully bound to device\n"));
	return 0;
}

static int acpi_start_single_object(struct acpi_device *device)
{
	int result = 0;
	struct acpi_driver *driver;


	if (!(driver = device->driver))
		return 0;

	if (driver->ops.start) {
		result = driver->ops.start(device);
		if (result && driver->ops.remove)
			driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
	}

	return result;
}

/**
 * acpi_bus_register_driver - register a driver with the ACPI bus
 * @driver: driver being registered
 *
 * Registers a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and binds.  Returns zero for
 * success or a negative error status for failure.
 */
int acpi_bus_register_driver(struct acpi_driver *driver)
{
	int ret;

	if (acpi_disabled)
		return -ENODEV;
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;

	ret = driver_register(&driver->drv);
	return ret;
}

EXPORT_SYMBOL(acpi_bus_register_driver);

/**
 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 * @driver: driver to unregister
 *
 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and unbinds.
 */
void acpi_bus_unregister_driver(struct acpi_driver *driver)
{
	driver_unregister(&driver->drv);
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
acpi_status
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
{
	acpi_status status;
	acpi_handle tmp;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *obj;

	status = acpi_get_handle(handle, "_EJD", &tmp);
	if (ACPI_FAILURE(status))
		return status;

	status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
	if (ACPI_SUCCESS(status)) {
		obj = buffer.pointer;
		status = acpi_get_handle(NULL, obj->string.pointer, ejd);
		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
{

	/* TBD */

	return;
}

static int acpi_bus_get_perf_flags(struct acpi_device *device)
{
	device->performance.state = ACPI_STATE_UNKNOWN;
	return 0;
}

static acpi_status
acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
					     union acpi_object *package)
{
	int i = 0;
	union acpi_object *element = NULL;

	if (!device || !package || (package->package.count < 2))
		return AE_BAD_PARAMETER;

	element = &(package->package.elements[0]);
	if (!element)
		return AE_BAD_PARAMETER;
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
			return AE_BAD_DATA;
		device->wakeup.gpe_device =
		    element->package.elements[0].reference.handle;
		device->wakeup.gpe_number =
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
		device->wakeup.gpe_number = element->integer.value;
	} else
		return AE_BAD_DATA;

	element = &(package->package.elements[1]);
	if (element->type != ACPI_TYPE_INTEGER) {
		return AE_BAD_DATA;
	}
	device->wakeup.sleep_state = element->integer.value;

	if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
		return AE_NO_MEMORY;
	}
	device->wakeup.resources.count = package->package.count - 2;
	for (i = 0; i < device->wakeup.resources.count; i++) {
		element = &(package->package.elements[i + 2]);
		if (element->type != ACPI_TYPE_ANY) {
			return AE_BAD_DATA;
		}

		device->wakeup.resources.handles[i] = element->reference.handle;
	}

	return AE_OK;
}

static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
{
	acpi_status status = 0;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package = NULL;

	struct acpi_device_id button_device_ids[] = {
		{"PNP0C0D", 0},
		{"PNP0C0C", 0},
		{"PNP0C0E", 0},
		{"", 0},
	};


	/* _PRW */
	status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
		goto end;
	}

	package = (union acpi_object *)buffer.pointer;
	status = acpi_bus_extract_wakeup_device_power_package(device, package);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
		goto end;
	}

	kfree(buffer.pointer);

	device->wakeup.flags.valid = 1;
	/* Power button, Lid switch always enable wakeup */
	if (!acpi_match_device_ids(device, button_device_ids))
		device->wakeup.flags.run_wake = 1;

      end:
	if (ACPI_FAILURE(status))
		device->flags.wake_capable = 0;
	return 0;
}

static int acpi_bus_get_power_flags(struct acpi_device *device)
{
	acpi_status status = 0;
	acpi_handle handle = NULL;
	u32 i = 0;


	/*
	 * Power Management Flags
	 */
	status = acpi_get_handle(device->handle, "_PSC", &handle);
	if (ACPI_SUCCESS(status))
		device->power.flags.explicit_get = 1;
	status = acpi_get_handle(device->handle, "_IRC", &handle);
	if (ACPI_SUCCESS(status))
		device->power.flags.inrush_current = 1;

	/*
	 * Enumerate supported power management states
	 */
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
		struct acpi_device_power_state *ps = &device->power.states[i];
		char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };

		/* Evaluate "_PRx" to se if power resources are referenced */
		acpi_evaluate_reference(device->handle, object_name, NULL,
					&ps->resources);
		if (ps->resources.count) {
			device->power.flags.power_resources = 1;
			ps->flags.valid = 1;
		}

		/* Evaluate "_PSx" to see if we can do explicit sets */
		object_name[2] = 'S';
		status = acpi_get_handle(device->handle, object_name, &handle);
		if (ACPI_SUCCESS(status)) {
			ps->flags.explicit_set = 1;
			ps->flags.valid = 1;
		}

		/* State is valid if we have some power control */
		if (ps->resources.count || ps->flags.explicit_set)
			ps->flags.valid = 1;

		ps->power = -1;	/* Unknown - driver assigned */
		ps->latency = -1;	/* Unknown - driver assigned */
	}

	/* Set defaults for D0 and D3 states (always valid) */
	device->power.states[ACPI_STATE_D0].flags.valid = 1;
	device->power.states[ACPI_STATE_D0].power = 100;
	device->power.states[ACPI_STATE_D3].flags.valid = 1;
	device->power.states[ACPI_STATE_D3].power = 0;

	/* TBD: System wake support and resource requirements. */

	device->power.state = ACPI_STATE_UNKNOWN;

	return 0;
}

static int acpi_bus_get_flags(struct acpi_device *device)
{
	acpi_status status = AE_OK;
	acpi_handle temp = NULL;


	/* Presence of _STA indicates 'dynamic_status' */
	status = acpi_get_handle(device->handle, "_STA", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.dynamic_status = 1;

	/* Presence of _CID indicates 'compatible_ids' */
	status = acpi_get_handle(device->handle, "_CID", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.compatible_ids = 1;

	/* Presence of _RMV indicates 'removable' */
	status = acpi_get_handle(device->handle, "_RMV", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.removable = 1;

	/* Presence of _EJD|_EJ0 indicates 'ejectable' */
	status = acpi_get_handle(device->handle, "_EJD", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.ejectable = 1;
	else {
		status = acpi_get_handle(device->handle, "_EJ0", &temp);
		if (ACPI_SUCCESS(status))
			device->flags.ejectable = 1;
	}

	/* Presence of _LCK indicates 'lockable' */
	status = acpi_get_handle(device->handle, "_LCK", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.lockable = 1;

	/* Presence of _PS0|_PR0 indicates 'power manageable' */
	status = acpi_get_handle(device->handle, "_PS0", &temp);
	if (ACPI_FAILURE(status))
		status = acpi_get_handle(device->handle, "_PR0", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.power_manageable = 1;

	/* Presence of _PRW indicates wake capable */
	status = acpi_get_handle(device->handle, "_PRW", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.wake_capable = 1;

	/* TBD: Peformance management */

	return 0;
}

static void acpi_device_get_busid(struct acpi_device *device,
				  acpi_handle handle, int type)
{
	char bus_id[5] = { '?', 0 };
	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
	int i = 0;

	/*
	 * Bus ID
	 * ------
	 * The device's Bus ID is simply the object name.
	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
	 */
	switch (type) {
	case ACPI_BUS_TYPE_SYSTEM:
		strcpy(device->pnp.bus_id, "ACPI");
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
		strcpy(device->pnp.bus_id, "PWRF");
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
		strcpy(device->pnp.bus_id, "SLPF");
		break;
	default:
		acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
		/* Clean up trailing underscores (if any) */
		for (i = 3; i > 1; i--) {
			if (bus_id[i] == '_')
				bus_id[i] = '\0';
			else
				break;
		}
		strcpy(device->pnp.bus_id, bus_id);
		break;
	}
}

static int
acpi_video_bus_match(struct acpi_device *device)
{
	acpi_handle h_dummy1;
	acpi_handle h_dummy2;
	acpi_handle h_dummy3;


	if (!device)
		return -EINVAL;

	/* Since there is no HID, CID for ACPI Video drivers, we have
	 * to check well known required nodes for each feature we support.
	 */

	/* Does this device able to support video switching ? */
	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
		return 0;

	/* Does this device able to retrieve a video ROM ? */
	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
		return 0;

	/* Does this device able to configure which video head to be POSTed ? */
	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
		return 0;

	return -ENODEV;
}

/*
 * acpi_bay_match - see if a device is an ejectable driver bay
 *
 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 * then we can safely call it an ejectable drive bay
 */
static int acpi_bay_match(struct acpi_device *device){
	acpi_status status;
	acpi_handle handle;
	acpi_handle tmp;
	acpi_handle phandle;

	handle = device->handle;

	status = acpi_get_handle(handle, "_EJ0", &tmp);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
		(ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
		(ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
		(ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
		return 0;

	if (acpi_get_parent(handle, &phandle))
		return -ENODEV;

        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
                return 0;

	return -ENODEV;
}

static void acpi_device_set_id(struct acpi_device *device,
			       struct acpi_device *parent, acpi_handle handle,
			       int type)
{
	struct acpi_device_info *info;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	char *hid = NULL;
	char *uid = NULL;
	struct acpi_compatible_id_list *cid_list = NULL;
	acpi_status status;

	switch (type) {
	case ACPI_BUS_TYPE_DEVICE:
		status = acpi_get_object_info(handle, &buffer);
		if (ACPI_FAILURE(status)) {
			printk("%s: Error reading device info\n", __FUNCTION__);
			return;
		}

		info = buffer.pointer;
		if (info->valid & ACPI_VALID_HID)
			hid = info->hardware_id.value;
		if (info->valid & ACPI_VALID_UID)
			uid = info->unique_id.value;
		if (info->valid & ACPI_VALID_CID)
			cid_list = &info->compatibility_id;
		if (info->valid & ACPI_VALID_ADR) {
			device->pnp.bus_address = info->address;
			device->flags.bus_address = 1;
		}

		if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
			status = acpi_video_bus_match(device);
			if(ACPI_SUCCESS(status))
				hid = ACPI_VIDEO_HID;

			status = acpi_bay_match(device);
			if (ACPI_SUCCESS(status))
				hid = ACPI_BAY_HID;
		}
		break;
	case ACPI_BUS_TYPE_POWER:
		hid = ACPI_POWER_HID;
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
		hid = ACPI_PROCESSOR_HID;
		break;
	case ACPI_BUS_TYPE_SYSTEM:
		hid = ACPI_SYSTEM_HID;
		break;
	case ACPI_BUS_TYPE_THERMAL:
		hid = ACPI_THERMAL_HID;
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
		hid = ACPI_BUTTON_HID_POWERF;
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON: