scan.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,076 行 · 第 1/2 页

	/* 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_VALUE(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 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;
		}
		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:
		hid = ACPI_BUTTON_HID_SLEEPF;
		break;
	}

	/* 
	 * \_SB
	 * ----
	 * Fix for the system root bus device -- the only root-level device.
	 */
	if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
		hid = ACPI_BUS_HID;
		strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
		strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
	}

	if (hid) {
		strcpy(device->pnp.hardware_id, hid);
		device->flags.hardware_id = 1;
	}
	if (uid) {
		strcpy(device->pnp.unique_id, uid);
		device->flags.unique_id = 1;
	}
	if (cid_list) {
		device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
		if (device->pnp.cid_list)
			memcpy(device->pnp.cid_list, cid_list, cid_list->size);
		else
			printk(KERN_ERR "Memory allocation error\n");
	}

	acpi_os_free(buffer.pointer);
}

int acpi_device_set_context(struct acpi_device * device, int type)
{
	acpi_status status = AE_OK;
	int result = 0;
	/*
	 * Context
	 * -------
	 * Attach this 'struct acpi_device' to the ACPI object.  This makes
	 * resolutions from handle->device very efficient.  Note that we need
	 * to be careful with fixed-feature devices as they all attach to the
	 * root object.
	 */
	if (type != ACPI_BUS_TYPE_POWER_BUTTON && 
	    type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
		status = acpi_attach_data(device->handle,
			acpi_bus_data_handler, device);

		if (ACPI_FAILURE(status)) {
			printk("Error attaching device data\n");
			result = -ENODEV;
		}
	}
	return result;
}

void acpi_device_get_debug_info(struct acpi_device * device, acpi_handle handle, int type)
{
#ifdef CONFIG_ACPI_DEBUG_OUTPUT
	char		*type_string = NULL;
	char		name[80] = {'?','\0'};
	acpi_buffer	buffer = {sizeof(name), name};

	switch (type) {
	case ACPI_BUS_TYPE_DEVICE:
		type_string = "Device";
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
		break;
	case ACPI_BUS_TYPE_POWER:
		type_string = "Power Resource";
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
		type_string = "Processor";
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
		break;
	case ACPI_BUS_TYPE_SYSTEM:
		type_string = "System";
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
		break;
	case ACPI_BUS_TYPE_THERMAL:
		type_string = "Thermal Zone";
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
		type_string = "Power Button";
		sprintf(name, "PWRB");
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
		type_string = "Sleep Button";
		sprintf(name, "SLPB");
		break;
	}

	printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
#endif /*CONFIG_ACPI_DEBUG_OUTPUT*/
}

static int 
acpi_bus_add (
	struct acpi_device	**child,
	struct acpi_device	*parent,
	acpi_handle		handle,
	int			type)
{
	int			result = 0;
	struct acpi_device	*device = NULL;

	ACPI_FUNCTION_TRACE("acpi_bus_add");

	if (!child)
		return_VALUE(-EINVAL);

	device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
	if (!device) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
		return_VALUE(-ENOMEM);
	}
	memset(device, 0, sizeof(struct acpi_device));

	device->handle = handle;
	device->parent = parent;

	acpi_device_get_busid(device,handle,type);

	/*
	 * Flags
	 * -----
	 * Get prior to calling acpi_bus_get_status() so we know whether
	 * or not _STA is present.  Note that we only look for object
	 * handles -- cannot evaluate objects until we know the device is
	 * present and properly initialized.
	 */
	result = acpi_bus_get_flags(device);
	if (result)
		goto end;

	/*
	 * Status
	 * ------
	 * See if the device is present.  We always assume that non-Device()
	 * objects (e.g. thermal zones, power resources, processors, etc.) are
	 * present, functioning, etc. (at least when parent object is present).
	 * Note that _STA has a different meaning for some objects (e.g.
	 * power resources) so we need to be careful how we use it.
	 */
	switch (type) {
	case ACPI_BUS_TYPE_DEVICE:
		result = acpi_bus_get_status(device);
		if (ACPI_FAILURE(result) || !device->status.present) {
			result = -ENOENT;
			goto end;
		}
		break;
	default:
		STRUCT_TO_INT(device->status) = 0x0F;
		break;
	}

	/*
	 * Initialize Device
	 * -----------------
	 * TBD: Synch with Core's enumeration/initialization process.
	 */

	/*
	 * Hardware ID, Unique ID, & Bus Address
	 * -------------------------------------
	 */
	acpi_device_set_id(device,parent,handle,type);

	/*
	 * Power Management
	 * ----------------
	 */
	if (device->flags.power_manageable) {
		result = acpi_bus_get_power_flags(device);
		if (result)
			goto end;
	}

 	/*
	 * Wakeup device management
	 *-----------------------
	 */
	if (device->flags.wake_capable) {
		result = acpi_bus_get_wakeup_device_flags(device);
		if (result)
			goto end;
	}

	/*
	 * Performance Management
	 * ----------------------
	 */
	if (device->flags.performance_manageable) {
		result = acpi_bus_get_perf_flags(device);
		if (result)
			goto end;
	}

	if ((result = acpi_device_set_context(device,type)))
		goto end;

	acpi_device_get_debug_info(device,handle,type);

	acpi_device_register(device,parent);

	/*
	 * Bind _ADR-Based Devices
	 * -----------------------
	 * If there's a a bus address (_ADR) then we utilize the parent's 
	 * 'bind' function (if exists) to bind the ACPI- and natively-
	 * enumerated device representations.
	 */
	if (device->flags.bus_address) {
		if (device->parent && device->parent->ops.bind)
			device->parent->ops.bind(device);
	}

	/*
	 * Locate & Attach Driver
	 * ----------------------
	 * If there's a hardware id (_HID) or compatible ids (_CID) we check
	 * to see if there's a driver installed for this kind of device.  Note
	 * that drivers can install before or after a device is enumerated.
	 *
	 * TBD: Assumes LDM provides driver hot-plug capability.
	 */
	acpi_bus_find_driver(device);

end:
	if (!result)
		*child = device;
	else {
		if (device->pnp.cid_list)
			kfree(device->pnp.cid_list);
		kfree(device);
	}

	return_VALUE(result);
}



static int acpi_bus_scan (struct acpi_device	*start)
{
	acpi_status		status = AE_OK;
	struct acpi_device	*parent = NULL;
	struct acpi_device	*child = NULL;
	acpi_handle		phandle = NULL;
	acpi_handle		chandle = NULL;
	acpi_object_type	type = 0;
	u32			level = 1;

	ACPI_FUNCTION_TRACE("acpi_bus_scan");

	if (!start)
		return_VALUE(-EINVAL);

	parent = start;
	phandle = start->handle;
	
	/*
	 * Parse through the ACPI namespace, identify all 'devices', and
	 * create a new 'struct acpi_device' for each.
	 */
	while ((level > 0) && parent) {

		status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
			chandle, &chandle);

		/*
		 * If this scope is exhausted then move our way back up.
		 */
		if (ACPI_FAILURE(status)) {
			level--;
			chandle = phandle;
			acpi_get_parent(phandle, &phandle);
			if (parent->parent)
				parent = parent->parent;
			continue;
		}

		status = acpi_get_type(chandle, &type);
		if (ACPI_FAILURE(status))
			continue;

		/*
		 * If this is a scope object then parse it (depth-first).
		 */
		if (type == ACPI_TYPE_LOCAL_SCOPE) {
			level++;
			phandle = chandle;
			chandle = NULL;
			continue;
		}

		/*
		 * We're only interested in objects that we consider 'devices'.
		 */
		switch (type) {
		case ACPI_TYPE_DEVICE:
			type = ACPI_BUS_TYPE_DEVICE;
			break;
		case ACPI_TYPE_PROCESSOR:
			type = ACPI_BUS_TYPE_PROCESSOR;
			break;
		case ACPI_TYPE_THERMAL:
			type = ACPI_BUS_TYPE_THERMAL;
			break;
		case ACPI_TYPE_POWER:
			type = ACPI_BUS_TYPE_POWER;
			break;
		default:
			continue;
		}

		status = acpi_bus_add(&child, parent, chandle, type);
		if (ACPI_FAILURE(status))
			continue;

		/*
		 * If the device is present, enabled, and functioning then
		 * parse its scope (depth-first).  Note that we need to
		 * represent absent devices to facilitate PnP notifications
		 * -- but only the subtree head (not all of its children,
		 * which will be enumerated when the parent is inserted).
		 *
		 * TBD: Need notifications and other detection mechanisms
		 *	in place before we can fully implement this.
		 */
		if (child->status.present) {
			status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
						      NULL, NULL);
			if (ACPI_SUCCESS(status)) {
				level++;
				phandle = chandle;
				chandle = NULL;
				parent = child;
			}
		}
	}

	return_VALUE(0);
}


static int
acpi_bus_scan_fixed (
	struct acpi_device	*root)
{
	int			result = 0;
	struct acpi_device	*device = NULL;

	ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");

	if (!root)
		return_VALUE(-ENODEV);

	/*
	 * Enumerate all fixed-feature devices.
	 */
	if (acpi_fadt.pwr_button == 0)
		result = acpi_bus_add(&device, acpi_root, 
			NULL, ACPI_BUS_TYPE_POWER_BUTTON);

	if (acpi_fadt.sleep_button == 0)
		result = acpi_bus_add(&device, acpi_root, 
			NULL, ACPI_BUS_TYPE_SLEEP_BUTTON);

	return_VALUE(result);
}


static int __init acpi_scan_init(void)
{
	int result;

	ACPI_FUNCTION_TRACE("acpi_scan_init");

	if (acpi_disabled)
		return_VALUE(0);

	kset_register(&acpi_namespace_kset);

	/*
	 * Create the root device in the bus's device tree
	 */
	result = acpi_bus_add(&acpi_root, NULL, ACPI_ROOT_OBJECT, 
		ACPI_BUS_TYPE_SYSTEM);
	if (result)
		goto Done;

	/*
	 * Enumerate devices in the ACPI namespace.
	 */
	result = acpi_bus_scan_fixed(acpi_root);
	if (!result) 
		result = acpi_bus_scan(acpi_root);

	if (result)
		acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);

 Done:
	return_VALUE(result);
}

subsys_initcall(acpi_scan_init);