scan.c 45.5 KB
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/*
 * scan.c - support for transforming the ACPI namespace into individual objects
 */

#include <linux/module.h>
#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/acpi.h>
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#include <linux/signal.h>
#include <linux/kthread.h>
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#include <linux/dmi.h>
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#include <linux/nls.h>
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#include <acpi/acpi_drivers.h>

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#include "internal.h"

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#define _COMPONENT		ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME("scan");
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#define STRUCT_TO_INT(s)	(*((int*)&s))
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extern struct acpi_device *acpi_root;
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#define ACPI_BUS_CLASS			"system_bus"
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#define ACPI_BUS_HID			"LNXSYBUS"
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#define ACPI_BUS_DEVICE_NAME		"System Bus"

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#define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)

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static const char *dummy_hid = "device";
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/*
 * The following ACPI IDs are known to be suitable for representing as
 * platform devices.
 */
static const struct acpi_device_id acpi_platform_device_ids[] = {

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	{ "PNP0D40" },

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	/* Haswell LPSS devices */
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	{ "INT33C0", ACPI_PLATFORM_CLK },
	{ "INT33C1", ACPI_PLATFORM_CLK },
	{ "INT33C2", ACPI_PLATFORM_CLK },
	{ "INT33C3", ACPI_PLATFORM_CLK },
	{ "INT33C4", ACPI_PLATFORM_CLK },
	{ "INT33C5", ACPI_PLATFORM_CLK },
	{ "INT33C6", ACPI_PLATFORM_CLK },
	{ "INT33C7", ACPI_PLATFORM_CLK },
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	{ }
};

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static LIST_HEAD(acpi_device_list);
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static LIST_HEAD(acpi_bus_id_list);
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static DEFINE_MUTEX(acpi_scan_lock);
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DEFINE_MUTEX(acpi_device_lock);
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LIST_HEAD(acpi_wakeup_device_list);

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struct acpi_device_bus_id{
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	char bus_id[15];
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	unsigned int instance_no;
	struct list_head node;
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};
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/*
 * Creates hid/cid(s) string needed for modalias and uevent
 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
 * char *modalias: "acpi:IBM0001:ACPI0001"
*/
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static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
			   int size)
{
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	int len;
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	int count;
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	struct acpi_hardware_id *id;
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	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

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	len = snprintf(modalias, size, "acpi:");
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	size -= len;

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	list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
		count = snprintf(&modalias[len], size, "%s:", id->id);
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		if (count < 0 || count >= size)
			return -EINVAL;
		len += count;
		size -= count;
	}

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	modalias[len] = '\0';
	return len;
}

static ssize_t
acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	int len;

	/* Device has no HID and no CID or string is >1024 */
	len = create_modalias(acpi_dev, buf, 1024);
	if (len <= 0)
		return 0;
	buf[len++] = '\n';
	return len;
}
static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);

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/**
 * acpi_bus_hot_remove_device: hot-remove a device and its children
 * @context: struct acpi_eject_event pointer (freed in this func)
 *
 * Hot-remove a device and its children. This function frees up the
 * memory space passed by arg context, so that the caller may call
 * this function asynchronously through acpi_os_hotplug_execute().
 */
void acpi_bus_hot_remove_device(void *context)
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{
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	struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
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	struct acpi_device *device = ej_event->device;
	acpi_handle handle = device->handle;
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	acpi_handle temp;
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	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status = AE_OK;
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	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
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	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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		"Hot-removing device %s...\n", dev_name(&device->dev)));
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	acpi_bus_trim(device);
	/* Device node has been released. */
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	device = NULL;

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	/* power off device */
	status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
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		printk(KERN_WARNING PREFIX
				"Power-off device failed\n");
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	if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
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		arg_list.count = 1;
		arg_list.pointer = &arg;
		arg.type = ACPI_TYPE_INTEGER;
		arg.integer.value = 0;
		acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
	}

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = 1;

	/*
	 * TBD: _EJD support.
	 */
	status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
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	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND)
			printk(KERN_WARNING PREFIX
					"Eject device failed\n");
		goto err_out;
	}
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	kfree(context);
	return;
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err_out:
	/* Inform firmware the hot-remove operation has completed w/ error */
	(void) acpi_evaluate_hotplug_ost(handle,
				ej_event->event, ost_code, NULL);
	kfree(context);
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	return;
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}
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EXPORT_SYMBOL(acpi_bus_hot_remove_device);
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static ssize_t real_power_state_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct acpi_device *adev = to_acpi_device(dev);
	int state;
	int ret;

	ret = acpi_device_get_power(adev, &state);
	if (ret)
		return ret;

	return sprintf(buf, "%s\n", acpi_power_state_string(state));
}

static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);

static ssize_t power_state_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct acpi_device *adev = to_acpi_device(dev);

	return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
}

static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);

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static ssize_t
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acpi_eject_store(struct device *d, struct device_attribute *attr,
		const char *buf, size_t count)
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{
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	int ret = count;
	acpi_status status;
	acpi_object_type type = 0;
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	struct acpi_device *acpi_device = to_acpi_device(d);
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	struct acpi_eject_event *ej_event;
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	if ((!count) || (buf[0] != '1')) {
		return -EINVAL;
	}
#ifndef FORCE_EJECT
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	if (acpi_device->driver == NULL) {
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		ret = -ENODEV;
		goto err;
	}
#endif
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	status = acpi_get_type(acpi_device->handle, &type);
	if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
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		ret = -ENODEV;
		goto err;
	}

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	ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
	if (!ej_event) {
		ret = -ENOMEM;
		goto err;
	}

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	ej_event->device = acpi_device;
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	if (acpi_device->flags.eject_pending) {
		/* event originated from ACPI eject notification */
		ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
		acpi_device->flags.eject_pending = 0;
	} else {
		/* event originated from user */
		ej_event->event = ACPI_OST_EC_OSPM_EJECT;
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		(void) acpi_evaluate_hotplug_ost(acpi_device->handle,
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			ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
	}

	acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
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err:
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	return ret;
}

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static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
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static ssize_t
acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
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	return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
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}
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static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
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static ssize_t acpi_device_uid_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);

	return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
}
static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);

static ssize_t acpi_device_adr_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);

	return sprintf(buf, "0x%08x\n",
		       (unsigned int)(acpi_dev->pnp.bus_address));
}
static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);

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static ssize_t
acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
	int result;
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	result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
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	if (result)
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		goto end;
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	result = sprintf(buf, "%s\n", (char*)path.pointer);
	kfree(path.pointer);
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end:
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	return result;
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}
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static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
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/* sysfs file that shows description text from the ACPI _STR method */
static ssize_t description_show(struct device *dev,
				struct device_attribute *attr,
				char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	int result;

	if (acpi_dev->pnp.str_obj == NULL)
		return 0;

	/*
	 * The _STR object contains a Unicode identifier for a device.
	 * We need to convert to utf-8 so it can be displayed.
	 */
	result = utf16s_to_utf8s(
		(wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
		acpi_dev->pnp.str_obj->buffer.length,
		UTF16_LITTLE_ENDIAN, buf,
		PAGE_SIZE);

	buf[result++] = '\n';

	return result;
}
static DEVICE_ATTR(description, 0444, description_show, NULL);

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static ssize_t
acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
		     char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);

	return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
}
static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);

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static int acpi_device_setup_files(struct acpi_device *dev)
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{
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	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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	acpi_status status;
	acpi_handle temp;
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	unsigned long long sun;
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	int result = 0;
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	/*
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	 * Devices gotten from FADT don't have a "path" attribute
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	 */
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	if (dev->handle) {
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		result = device_create_file(&dev->dev, &dev_attr_path);
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		if (result)
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			goto end;
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	}

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	if (!list_empty(&dev->pnp.ids)) {
		result = device_create_file(&dev->dev, &dev_attr_hid);
		if (result)
			goto end;
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		result = device_create_file(&dev->dev, &dev_attr_modalias);
		if (result)
			goto end;
	}
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	/*
	 * If device has _STR, 'description' file is created
	 */
	status = acpi_get_handle(dev->handle, "_STR", &temp);
	if (ACPI_SUCCESS(status)) {
		status = acpi_evaluate_object(dev->handle, "_STR",
					NULL, &buffer);
		if (ACPI_FAILURE(status))
			buffer.pointer = NULL;
		dev->pnp.str_obj = buffer.pointer;
		result = device_create_file(&dev->dev, &dev_attr_description);
		if (result)
			goto end;
	}

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	if (dev->flags.bus_address)
		result = device_create_file(&dev->dev, &dev_attr_adr);
	if (dev->pnp.unique_id)
		result = device_create_file(&dev->dev, &dev_attr_uid);

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	status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
	if (ACPI_SUCCESS(status)) {
		dev->pnp.sun = (unsigned long)sun;
		result = device_create_file(&dev->dev, &dev_attr_sun);
		if (result)
			goto end;
	} else {
		dev->pnp.sun = (unsigned long)-1;
	}

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        /*
         * If device has _EJ0, 'eject' file is created that is used to trigger
         * hot-removal function from userland.
         */
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	status = acpi_get_handle(dev->handle, "_EJ0", &temp);
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	if (ACPI_SUCCESS(status)) {
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		result = device_create_file(&dev->dev, &dev_attr_eject);
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		if (result)
			return result;
	}

	if (dev->flags.power_manageable) {
		result = device_create_file(&dev->dev, &dev_attr_power_state);
		if (result)
			return result;

		if (dev->power.flags.power_resources)
			result = device_create_file(&dev->dev,
						    &dev_attr_real_power_state);
	}

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end:
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	return result;
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}

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static void acpi_device_remove_files(struct acpi_device *dev)
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{
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	acpi_status status;
	acpi_handle temp;
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	if (dev->flags.power_manageable) {
		device_remove_file(&dev->dev, &dev_attr_power_state);
		if (dev->power.flags.power_resources)
			device_remove_file(&dev->dev,
					   &dev_attr_real_power_state);
	}

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	/*
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	 * If device has _STR, remove 'description' file
	 */
	status = acpi_get_handle(dev->handle, "_STR", &temp);
	if (ACPI_SUCCESS(status)) {
		kfree(dev->pnp.str_obj);
		device_remove_file(&dev->dev, &dev_attr_description);
	}
	/*
	 * If device has _EJ0, remove 'eject' file.
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	 */
	status = acpi_get_handle(dev->handle, "_EJ0", &temp);
	if (ACPI_SUCCESS(status))
		device_remove_file(&dev->dev, &dev_attr_eject);
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	status = acpi_get_handle(dev->handle, "_SUN", &temp);
	if (ACPI_SUCCESS(status))
		device_remove_file(&dev->dev, &dev_attr_sun);

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	if (dev->pnp.unique_id)
		device_remove_file(&dev->dev, &dev_attr_uid);
	if (dev->flags.bus_address)
		device_remove_file(&dev->dev, &dev_attr_adr);
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	device_remove_file(&dev->dev, &dev_attr_modalias);
	device_remove_file(&dev->dev, &dev_attr_hid);
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	if (dev->handle)
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		device_remove_file(&dev->dev, &dev_attr_path);
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}
/* --------------------------------------------------------------------------
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			ACPI Bus operations
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   -------------------------------------------------------------------------- */
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static const struct acpi_device_id *__acpi_match_device(
	struct acpi_device *device, const struct acpi_device_id *ids)
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{
	const struct acpi_device_id *id;
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	struct acpi_hardware_id *hwid;
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	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device->status.present)
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		return NULL;
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	for (id = ids; id->id[0]; id++)
		list_for_each_entry(hwid, &device->pnp.ids, list)
			if (!strcmp((char *) id->id, hwid->id))
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				return id;

	return NULL;
}

/**
 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 * @ids: Array of struct acpi_device_id object to match against.
 * @dev: The device structure to match.
 *
 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 * object for that handle and use that object to match against a given list of
 * device IDs.
 *
 * Return a pointer to the first matching ID on success or %NULL on failure.
 */
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
					       const struct device *dev)
{
	struct acpi_device *adev;

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	if (!ids || !ACPI_HANDLE(dev)
	    || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
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		return NULL;

	return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
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int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids) ? 0 : -ENOENT;
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}
EXPORT_SYMBOL(acpi_match_device_ids);

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void acpi_free_ids(struct acpi_device *device)
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{
	struct acpi_hardware_id *id, *tmp;

	list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
		kfree(id->id);
		kfree(id);
	}
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	kfree(device->pnp.unique_id);
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}

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static void acpi_free_power_resources_lists(struct acpi_device *device)
{
	int i;

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	if (device->wakeup.flags.valid)
		acpi_power_resources_list_free(&device->wakeup.resources);

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	if (!device->flags.power_manageable)
		return;

	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
		struct acpi_device_power_state *ps = &device->power.states[i];
		acpi_power_resources_list_free(&ps->resources);
	}
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}

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static void acpi_device_release(struct device *dev)
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{
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	struct acpi_device *acpi_dev = to_acpi_device(dev);
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	acpi_free_ids(acpi_dev);
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	acpi_free_power_resources_lists(acpi_dev);
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	kfree(acpi_dev);
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}

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static int acpi_bus_match(struct device *dev, struct device_driver *drv)
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{
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	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
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	return acpi_dev->flags.match_driver
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		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
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}
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static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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	struct acpi_device *acpi_dev = to_acpi_device(dev);
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	int len;
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	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

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	if (add_uevent_var(env, "MODALIAS="))
		return -ENOMEM;
	len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
			      sizeof(env->buf) - env->buflen);
	if (len >= (sizeof(env->buf) - env->buflen))
		return -ENOMEM;
	env->buflen += len;
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570
	return 0;
L
Linus Torvalds 已提交
571 572
}

573 574 575 576 577 578 579 580 581 582 583
static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
{
	struct acpi_device *device = data;

	device->driver->ops.notify(device, event);
}

static acpi_status acpi_device_notify_fixed(void *data)
{
	struct acpi_device *device = data;

584 585
	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
586 587 588 589 590 591 592
	return AE_OK;
}

static int acpi_device_install_notify_handler(struct acpi_device *device)
{
	acpi_status status;

593
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
594 595 596 597
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_notify_fixed,
						     device);
598
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
						     acpi_device_notify_fixed,
						     device);
	else
		status = acpi_install_notify_handler(device->handle,
						     ACPI_DEVICE_NOTIFY,
						     acpi_device_notify,
						     device);

	if (ACPI_FAILURE(status))
		return -EINVAL;
	return 0;
}

static void acpi_device_remove_notify_handler(struct acpi_device *device)
{
616
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
617 618
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_notify_fixed);
619
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
620 621 622 623 624 625 626
		acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
						acpi_device_notify_fixed);
	else
		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
					   acpi_device_notify);
}

627 628
static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
static int acpi_device_probe(struct device * dev)
L
Linus Torvalds 已提交
629
{
630 631 632 633 634 635
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
	int ret;

	ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
	if (!ret) {
636 637 638 639
		if (acpi_drv->ops.notify) {
			ret = acpi_device_install_notify_handler(acpi_dev);
			if (ret) {
				if (acpi_drv->ops.remove)
640
					acpi_drv->ops.remove(acpi_dev);
641 642 643 644
				return ret;
			}
		}

645 646 647 648 649 650 651
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			"Found driver [%s] for device [%s]\n",
			acpi_drv->name, acpi_dev->pnp.bus_id));
		get_device(dev);
	}
	return ret;
}
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652

653 654 655 656 657 658
static int acpi_device_remove(struct device * dev)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = acpi_dev->driver;

	if (acpi_drv) {
659 660
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
661
		if (acpi_drv->ops.remove)
662
			acpi_drv->ops.remove(acpi_dev);
L
Linus Torvalds 已提交
663
	}
664
	acpi_dev->driver = NULL;
665
	acpi_dev->driver_data = NULL;
L
Linus Torvalds 已提交
666

667
	put_device(dev);
Z
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668 669
	return 0;
}
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670

671
struct bus_type acpi_bus_type = {
Z
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672
	.name		= "acpi",
673 674 675 676
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
Z
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677 678
};

679 680
int acpi_device_add(struct acpi_device *device,
		    void (*release)(struct device *))
L
Linus Torvalds 已提交
681
{
L
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682
	int result;
683 684
	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
	int found = 0;
685

686 687 688 689 690 691 692 693 694 695 696 697
	if (device->handle) {
		acpi_status status;

		status = acpi_attach_data(device->handle, acpi_bus_data_handler,
					  device);
		if (ACPI_FAILURE(status)) {
			acpi_handle_err(device->handle,
					"Unable to attach device data\n");
			return -ENODEV;
		}
	}

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698 699 700 701 702 703 704 705
	/*
	 * Linkage
	 * -------
	 * Link this device to its parent and siblings.
	 */
	INIT_LIST_HEAD(&device->children);
	INIT_LIST_HEAD(&device->node);
	INIT_LIST_HEAD(&device->wakeup_list);
706 707
	INIT_LIST_HEAD(&device->physical_node_list);
	mutex_init(&device->physical_node_lock);
708
	INIT_LIST_HEAD(&device->power_dependent);
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Linus Torvalds 已提交
709

710 711
	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
	if (!new_bus_id) {
712 713 714
		pr_err(PREFIX "Memory allocation error\n");
		result = -ENOMEM;
		goto err_detach;
L
Linus Torvalds 已提交
715
	}
716

717
	mutex_lock(&acpi_device_lock);
718 719 720 721 722
	/*
	 * Find suitable bus_id and instance number in acpi_bus_id_list
	 * If failed, create one and link it into acpi_bus_id_list
	 */
	list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
723 724 725
		if (!strcmp(acpi_device_bus_id->bus_id,
			    acpi_device_hid(device))) {
			acpi_device_bus_id->instance_no++;
726 727 728 729
			found = 1;
			kfree(new_bus_id);
			break;
		}
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730
	}
731
	if (!found) {
732
		acpi_device_bus_id = new_bus_id;
733
		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
734 735
		acpi_device_bus_id->instance_no = 0;
		list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
L
Linus Torvalds 已提交
736
	}
737
	dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
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738

L
Len Brown 已提交
739
	if (device->parent)
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740
		list_add_tail(&device->node, &device->parent->children);
L
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741

Z
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742 743
	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
744
	mutex_unlock(&acpi_device_lock);
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745

746
	if (device->parent)
747
		device->dev.parent = &device->parent->dev;
748
	device->dev.bus = &acpi_bus_type;
749
	device->dev.release = release;
750
	result = device_add(&device->dev);
751
	if (result) {
752
		dev_err(&device->dev, "Error registering device\n");
753
		goto err;
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754 755
	}

756
	result = acpi_device_setup_files(device);
757
	if (result)
758 759
		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
		       dev_name(&device->dev));
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760

761
	device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
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762
	return 0;
763 764

 err:
765
	mutex_lock(&acpi_device_lock);
L
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766
	if (device->parent)
767 768
		list_del(&device->node);
	list_del(&device->wakeup_list);
769
	mutex_unlock(&acpi_device_lock);
770 771 772

 err_detach:
	acpi_detach_data(device->handle, acpi_bus_data_handler);
773
	return result;
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774 775
}

776
static void acpi_device_unregister(struct acpi_device *device)
Z
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777
{
778
	mutex_lock(&acpi_device_lock);
L
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779
	if (device->parent)
Z
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780
		list_del(&device->node);
L
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781

Z
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782
	list_del(&device->wakeup_list);
783
	mutex_unlock(&acpi_device_lock);
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784

Z
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785
	acpi_detach_data(device->handle, acpi_bus_data_handler);
786

787
	acpi_power_add_remove_device(device, false);
P
Patrick Mochel 已提交
788
	acpi_device_remove_files(device);
789 790 791
	if (device->remove)
		device->remove(device);

792
	device_del(&device->dev);
793 794 795 796 797
	/*
	 * Drop the reference counts of all power resources the device depends
	 * on and turn off the ones that have no more references.
	 */
	acpi_power_transition(device, ACPI_STATE_D3_COLD);
798
	put_device(&device->dev);
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799 800
}

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801 802 803
/* --------------------------------------------------------------------------
                                 Driver Management
   -------------------------------------------------------------------------- */
L
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804
/**
805 806 807 808
 * acpi_bus_driver_init - add a device to a driver
 * @device: the device to add and initialize
 * @driver: driver for the device
 *
809
 * Used to initialize a device via its device driver.  Called whenever a
810
 * driver is bound to a device.  Invokes the driver's add() ops.
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811 812
 */
static int
L
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813
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
L
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814
{
L
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815
	int result = 0;
L
Linus Torvalds 已提交
816 817

	if (!device || !driver)
818
		return -EINVAL;
L
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819 820

	if (!driver->ops.add)
821
		return -ENOSYS;
L
Linus Torvalds 已提交
822 823 824 825

	result = driver->ops.add(device);
	if (result) {
		device->driver = NULL;
826
		device->driver_data = NULL;
827
		return result;
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Linus Torvalds 已提交
828 829 830 831 832 833 834 835 836
	}

	device->driver = driver;

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

L
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837 838
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver successfully bound to device\n"));
839
	return 0;
840 841
}

Z
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842 843 844 845 846 847 848 849 850
/**
 * 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)
L
Linus Torvalds 已提交
851
{
852
	int ret;
L
Linus Torvalds 已提交
853

Z
Zhang Rui 已提交
854 855
	if (acpi_disabled)
		return -ENODEV;
856 857 858
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;
L
Linus Torvalds 已提交
859

860 861
	ret = driver_register(&driver->drv);
	return ret;
Z
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862
}
L
Linus Torvalds 已提交
863

Z
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864 865 866 867 868 869 870 871 872 873 874
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)
{
875
	driver_unregister(&driver->drv);
Z
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876 877 878 879 880 881 882
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
	acpi_status status;
	int ret;
	struct acpi_device *device;

	/*
	 * Fixed hardware devices do not appear in the namespace and do not
	 * have handles, but we fabricate acpi_devices for them, so we have
	 * to deal with them specially.
	 */
	if (handle == NULL)
		return acpi_root;

	do {
		status = acpi_get_parent(handle, &handle);
		if (status == AE_NULL_ENTRY)
			return NULL;
		if (ACPI_FAILURE(status))
			return acpi_root;

		ret = acpi_bus_get_device(handle, &device);
		if (ret == 0)
			return device;
	} while (1);
}

Z
Zhang Rui 已提交
910 911 912 913 914 915 916 917 918 919 920 921 922 923 924
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;
925 926
		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
					 ejd);
Z
Zhang Rui 已提交
927 928 929 930 931 932
		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

933
void acpi_bus_data_handler(acpi_handle handle, void *context)
Z
Zhang Rui 已提交
934 935 936 937 938 939 940
{

	/* TBD */

	return;
}

941 942
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
					struct acpi_device_wakeup *wakeup)
Z
Zhang Rui 已提交
943
{
944 945
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package = NULL;
Z
Zhang Rui 已提交
946
	union acpi_object *element = NULL;
947
	acpi_status status;
948
	int err = -ENODATA;
Z
Zhang Rui 已提交
949

950
	if (!wakeup)
951
		return -EINVAL;
Z
Zhang Rui 已提交
952

953
	INIT_LIST_HEAD(&wakeup->resources);
Z
Zhang Rui 已提交
954

955 956 957 958
	/* _PRW */
	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
959
		return err;
960 961 962 963
	}

	package = (union acpi_object *)buffer.pointer;

964
	if (!package || package->package.count < 2)
965 966
		goto out;

Z
Zhang Rui 已提交
967
	element = &(package->package.elements[0]);
968
	if (!element)
969
		goto out;
970

Z
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971 972 973 974
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
975
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
976
			goto out;
977

978
		wakeup->gpe_device =
Z
Zhang Rui 已提交
979
		    element->package.elements[0].reference.handle;
980
		wakeup->gpe_number =
Z
Zhang Rui 已提交
981 982
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
983 984 985 986 987
		wakeup->gpe_device = NULL;
		wakeup->gpe_number = element->integer.value;
	} else {
		goto out;
	}
Z
Zhang Rui 已提交
988 989

	element = &(package->package.elements[1]);
990
	if (element->type != ACPI_TYPE_INTEGER)
991
		goto out;
992

993
	wakeup->sleep_state = element->integer.value;
Z
Zhang Rui 已提交
994

995 996
	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
	if (err)
997
		goto out;
Z
Zhang Rui 已提交
998

999 1000
	if (!list_empty(&wakeup->resources)) {
		int sleep_state;
Z
Zhang Rui 已提交
1001

1002 1003 1004 1005 1006 1007 1008 1009
		sleep_state = acpi_power_min_system_level(&wakeup->resources);
		if (sleep_state < wakeup->sleep_state) {
			acpi_handle_warn(handle, "Overriding _PRW sleep state "
					 "(S%d) by S%d from power resources\n",
					 (int)wakeup->sleep_state, sleep_state);
			wakeup->sleep_state = sleep_state;
		}
	}
L
Lin Ming 已提交
1010
	acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1011

1012 1013
 out:
	kfree(buffer.pointer);
1014
	return err;
L
Linus Torvalds 已提交
1015 1016
}

1017
static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1018
{
1019 1020
	struct acpi_device_id button_device_ids[] = {
		{"PNP0C0C", 0},
1021
		{"PNP0C0D", 0},
1022 1023 1024
		{"PNP0C0E", 0},
		{"", 0},
	};
1025 1026 1027
	acpi_status status;
	acpi_event_status event_status;

1028
	device->wakeup.flags.notifier_present = 0;
1029 1030 1031 1032

	/* Power button, Lid switch always enable wakeup */
	if (!acpi_match_device_ids(device, button_device_ids)) {
		device->wakeup.flags.run_wake = 1;
1033 1034 1035 1036 1037
		if (!acpi_match_device_ids(device, &button_device_ids[1])) {
			/* Do not use Lid/sleep button for S5 wakeup */
			if (device->wakeup.sleep_state == ACPI_STATE_S5)
				device->wakeup.sleep_state = ACPI_STATE_S4;
		}
1038
		device_set_wakeup_capable(&device->dev, true);
1039 1040 1041
		return;
	}

1042 1043 1044
	status = acpi_get_gpe_status(device->wakeup.gpe_device,
					device->wakeup.gpe_number,
						&event_status);
1045 1046 1047 1048 1049
	if (status == AE_OK)
		device->wakeup.flags.run_wake =
				!!(event_status & ACPI_EVENT_FLAG_HANDLE);
}

1050
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1051
{
1052
	acpi_handle temp;
1053
	acpi_status status = 0;
1054
	int err;
1055

1056 1057 1058 1059 1060
	/* Presence of _PRW indicates wake capable */
	status = acpi_get_handle(device->handle, "_PRW", &temp);
	if (ACPI_FAILURE(status))
		return;

1061 1062 1063 1064
	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
							   &device->wakeup);
	if (err) {
		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1065
		return;
Z
Zhang Rui 已提交
1066
	}
L
Linus Torvalds 已提交
1067

Z
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1068
	device->wakeup.flags.valid = 1;
1069
	device->wakeup.prepare_count = 0;
1070
	acpi_bus_set_run_wake_flags(device);
1071 1072 1073 1074 1075 1076
	/* Call _PSW/_DSW object to disable its ability to wake the sleeping
	 * system for the ACPI device with the _PRW object.
	 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
	 * So it is necessary to call _DSW object first. Only when it is not
	 * present will the _PSW object used.
	 */
1077 1078
	err = acpi_device_sleep_wake(device, 0, 0, 0);
	if (err)
1079 1080
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				"error in _DSW or _PSW evaluation\n"));
L
Linus Torvalds 已提交
1081 1082
}

1083 1084 1085
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
	struct acpi_device_power_state *ps = &device->power.states[state];
1086 1087
	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1088 1089
	acpi_handle handle;
	acpi_status status;
1090

1091 1092
	INIT_LIST_HEAD(&ps->resources);

1093 1094 1095 1096 1097 1098 1099 1100
	/* Evaluate "_PRx" to get referenced power resources */
	status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
	if (ACPI_SUCCESS(status)) {
		union acpi_object *package = buffer.pointer;

		if (buffer.length && package
		    && package->type == ACPI_TYPE_PACKAGE
		    && package->package.count) {
1101 1102 1103
			int err = acpi_extract_power_resources(package, 0,
							       &ps->resources);
			if (!err)
1104
				device->power.flags.power_resources = 1;
1105
		}
1106
		ACPI_FREE(buffer.pointer);
1107 1108 1109
	}

	/* Evaluate "_PSx" to see if we can do explicit sets */
1110 1111
	pathname[2] = 'S';
	status = acpi_get_handle(device->handle, pathname, &handle);
1112 1113 1114 1115 1116 1117 1118
	if (ACPI_SUCCESS(status))
		ps->flags.explicit_set = 1;

	/*
	 * State is valid if there are means to put the device into it.
	 * D3hot is only valid if _PR3 present.
	 */
1119
	if (!list_empty(&ps->resources)
1120 1121 1122 1123 1124 1125 1126 1127 1128
	    || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
		ps->flags.valid = 1;
		ps->flags.os_accessible = 1;
	}

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

1129
static void acpi_bus_get_power_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1130
{
1131 1132 1133
	acpi_status status;
	acpi_handle handle;
	u32 i;
B
Bjorn Helgaas 已提交
1134

1135 1136 1137 1138 1139 1140 1141 1142 1143
	/* Presence of _PS0|_PR0 indicates 'power manageable' */
	status = acpi_get_handle(device->handle, "_PS0", &handle);
	if (ACPI_FAILURE(status)) {
		status = acpi_get_handle(device->handle, "_PR0", &handle);
		if (ACPI_FAILURE(status))
			return;
	}

	device->flags.power_manageable = 1;
L
Len Brown 已提交
1144

Z
Zhang Rui 已提交
1145 1146 1147 1148 1149 1150 1151 1152 1153
	/*
	 * 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;
L
Linus Torvalds 已提交
1154

Z
Zhang Rui 已提交
1155 1156 1157
	/*
	 * Enumerate supported power management states
	 */
1158 1159
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
		acpi_bus_init_power_state(device, i);
1160

1161
	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
L
Linus Torvalds 已提交
1162

Z
Zhang Rui 已提交
1163 1164 1165 1166 1167
	/* 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;
L
Len Brown 已提交
1168

1169 1170 1171 1172
	/* Set D3cold's explicit_set flag if _PS3 exists. */
	if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
		device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;

1173 1174 1175 1176 1177
	/* Presence of _PS3 or _PRx means we can put the device into D3 cold */
	if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
			device->power.flags.power_resources)
		device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;

1178
	acpi_bus_init_power(device);
Z
Zhang Rui 已提交
1179
}
L
Len Brown 已提交
1180

1181
static void acpi_bus_get_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1182
{
L
Len Brown 已提交
1183 1184
	acpi_status status = AE_OK;
	acpi_handle temp = NULL;
L
Linus Torvalds 已提交
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206

	/* 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 _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;
	}
}

1207
static void acpi_device_get_busid(struct acpi_device *device)
L
Linus Torvalds 已提交
1208
{
L
Len Brown 已提交
1209 1210 1211
	char bus_id[5] = { '?', 0 };
	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
	int i = 0;
L
Linus Torvalds 已提交
1212 1213 1214 1215 1216 1217 1218

	/*
	 * Bus ID
	 * ------
	 * The device's Bus ID is simply the object name.
	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
	 */
1219
	if (ACPI_IS_ROOT_DEVICE(device)) {
L
Linus Torvalds 已提交
1220
		strcpy(device->pnp.bus_id, "ACPI");
1221 1222 1223 1224
		return;
	}

	switch (device->device_type) {
L
Linus Torvalds 已提交
1225 1226 1227 1228 1229 1230 1231
	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:
1232
		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
L
Linus Torvalds 已提交
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
		/* 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;
	}
}

1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
/*
 * 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;
}

1281 1282 1283 1284 1285 1286 1287 1288 1289
/*
 * acpi_dock_match - see if a device has a _DCK method
 */
static int acpi_dock_match(struct acpi_device *device)
{
	acpi_handle tmp;
	return acpi_get_handle(device->handle, "_DCK", &tmp);
}

1290
const char *acpi_device_hid(struct acpi_device *device)
1291
{
1292
	struct acpi_hardware_id *hid;
1293

1294 1295 1296
	if (list_empty(&device->pnp.ids))
		return dummy_hid;

1297 1298 1299 1300
	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
	return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
1301

1302 1303 1304
static void acpi_add_id(struct acpi_device *device, const char *dev_id)
{
	struct acpi_hardware_id *id;
1305

1306 1307 1308
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return;
1309

T
Thomas Meyer 已提交
1310
	id->id = kstrdup(dev_id, GFP_KERNEL);
1311 1312 1313
	if (!id->id) {
		kfree(id);
		return;
1314 1315
	}

1316
	list_add_tail(&id->list, &device->pnp.ids);
1317 1318
}

1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
/*
 * Old IBM workstations have a DSDT bug wherein the SMBus object
 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
 * prefix.  Work around this.
 */
static int acpi_ibm_smbus_match(struct acpi_device *device)
{
	acpi_handle h_dummy;
	struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
	int result;

	if (!dmi_name_in_vendors("IBM"))
		return -ENODEV;

	/* Look for SMBS object */
	result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
	if (result)
		return result;

	if (strcmp("SMBS", path.pointer)) {
		result = -ENODEV;
		goto out;
	}

	/* Does it have the necessary (but misnamed) methods? */
	result = -ENODEV;
	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
	    ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
	    ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
		result = 0;
out:
	kfree(path.pointer);
	return result;
}

1354
static void acpi_device_set_id(struct acpi_device *device)
L
Linus Torvalds 已提交
1355
{
L
Len Brown 已提交
1356
	acpi_status status;
1357
	struct acpi_device_info *info;
1358
	struct acpi_pnp_device_id_list *cid_list;
1359
	int i;
L
Linus Torvalds 已提交
1360

1361
	switch (device->device_type) {
L
Linus Torvalds 已提交
1362
	case ACPI_BUS_TYPE_DEVICE:
1363
		if (ACPI_IS_ROOT_DEVICE(device)) {
1364
			acpi_add_id(device, ACPI_SYSTEM_HID);
1365 1366 1367
			break;
		}

1368
		status = acpi_get_object_info(device->handle, &info);
L
Linus Torvalds 已提交
1369
		if (ACPI_FAILURE(status)) {
1370
			printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
L
Linus Torvalds 已提交
1371 1372 1373 1374
			return;
		}

		if (info->valid & ACPI_VALID_HID)
1375 1376
			acpi_add_id(device, info->hardware_id.string);
		if (info->valid & ACPI_VALID_CID) {
1377
			cid_list = &info->compatible_id_list;
1378 1379 1380
			for (i = 0; i < cid_list->count; i++)
				acpi_add_id(device, cid_list->ids[i].string);
		}
L
Linus Torvalds 已提交
1381 1382 1383 1384
		if (info->valid & ACPI_VALID_ADR) {
			device->pnp.bus_address = info->address;
			device->flags.bus_address = 1;
		}
1385 1386 1387
		if (info->valid & ACPI_VALID_UID)
			device->pnp.unique_id = kstrdup(info->unique_id.string,
							GFP_KERNEL);
1388

1389 1390
		kfree(info);

1391 1392 1393 1394
		/*
		 * Some devices don't reliably have _HIDs & _CIDs, so add
		 * synthetic HIDs to make sure drivers can find them.
		 */
1395
		if (acpi_is_video_device(device))
1396
			acpi_add_id(device, ACPI_VIDEO_HID);
1397
		else if (ACPI_SUCCESS(acpi_bay_match(device)))
1398
			acpi_add_id(device, ACPI_BAY_HID);
1399
		else if (ACPI_SUCCESS(acpi_dock_match(device)))
1400
			acpi_add_id(device, ACPI_DOCK_HID);
1401 1402
		else if (!acpi_ibm_smbus_match(device))
			acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1403
		else if (list_empty(&device->pnp.ids) &&
1404 1405 1406 1407 1408
			 ACPI_IS_ROOT_DEVICE(device->parent)) {
			acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
			strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
			strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
		}
1409

L
Linus Torvalds 已提交
1410 1411
		break;
	case ACPI_BUS_TYPE_POWER:
1412
		acpi_add_id(device, ACPI_POWER_HID);
L
Linus Torvalds 已提交
1413 1414
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
1415
		acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
L
Linus Torvalds 已提交
1416 1417
		break;
	case ACPI_BUS_TYPE_THERMAL:
1418
		acpi_add_id(device, ACPI_THERMAL_HID);
L
Linus Torvalds 已提交
1419 1420
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
1421
		acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
L
Linus Torvalds 已提交
1422 1423
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1424
		acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
L
Linus Torvalds 已提交
1425 1426 1427 1428
		break;
	}
}

1429 1430
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
			     int type, unsigned long long sta)
L
Linus Torvalds 已提交
1431
{
1432 1433 1434 1435 1436 1437 1438 1439
	INIT_LIST_HEAD(&device->pnp.ids);
	device->device_type = type;
	device->handle = handle;
	device->parent = acpi_bus_get_parent(handle);
	STRUCT_TO_INT(device->status) = sta;
	acpi_device_get_busid(device);
	acpi_device_set_id(device);
	acpi_bus_get_flags(device);
1440
	device->flags.match_driver = false;
1441 1442 1443
	device_initialize(&device->dev);
	dev_set_uevent_suppress(&device->dev, true);
}
1444

1445 1446
void acpi_device_add_finalize(struct acpi_device *device)
{
1447
	device->flags.match_driver = true;
1448 1449
	dev_set_uevent_suppress(&device->dev, false);
	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
L
Linus Torvalds 已提交
1450 1451
}

1452 1453
static int acpi_add_single_object(struct acpi_device **child,
				  acpi_handle handle, int type,
1454
				  unsigned long long sta)
L
Linus Torvalds 已提交
1455
{
1456 1457
	int result;
	struct acpi_device *device;
1458
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
L
Linus Torvalds 已提交
1459

1460
	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
L
Linus Torvalds 已提交
1461
	if (!device) {
1462
		printk(KERN_ERR PREFIX "Memory allocation error\n");
1463
		return -ENOMEM;
L
Linus Torvalds 已提交
1464 1465
	}

1466 1467
	acpi_init_device_object(device, handle, type, sta);
	acpi_bus_get_power_flags(device);
1468
	acpi_bus_get_wakeup_device_flags(device);
L
Linus Torvalds 已提交
1469

1470
	result = acpi_device_add(device, acpi_device_release);
1471
	if (result) {
1472
		acpi_device_release(&device->dev);
1473 1474
		return result;
	}
L
Linus Torvalds 已提交
1475

1476
	acpi_power_add_remove_device(device, true);
1477
	acpi_device_add_finalize(device);
1478 1479 1480 1481 1482 1483 1484
	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
		dev_name(&device->dev), (char *) buffer.pointer,
		device->parent ? dev_name(&device->parent->dev) : "(null)"));
	kfree(buffer.pointer);
	*child = device;
	return 0;
1485 1486
}

1487 1488
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
				    unsigned long long *sta)
L
Linus Torvalds 已提交
1489
{
1490 1491
	acpi_status status;
	acpi_object_type acpi_type;
L
Linus Torvalds 已提交
1492

1493
	status = acpi_get_type(handle, &acpi_type);
1494
	if (ACPI_FAILURE(status))
1495
		return -ENODEV;
L
Len Brown 已提交
1496

1497
	switch (acpi_type) {
1498 1499
	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
	case ACPI_TYPE_DEVICE:
1500 1501 1502 1503
		*type = ACPI_BUS_TYPE_DEVICE;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1504 1505
		break;
	case ACPI_TYPE_PROCESSOR:
1506 1507 1508 1509
		*type = ACPI_BUS_TYPE_PROCESSOR;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1510 1511
		break;
	case ACPI_TYPE_THERMAL:
1512 1513
		*type = ACPI_BUS_TYPE_THERMAL;
		*sta = ACPI_STA_DEFAULT;
1514 1515
		break;
	case ACPI_TYPE_POWER:
1516 1517
		*type = ACPI_BUS_TYPE_POWER;
		*sta = ACPI_STA_DEFAULT;
1518 1519
		break;
	default:
1520
		return -ENODEV;
1521
	}
L
Linus Torvalds 已提交
1522

1523 1524 1525
	return 0;
}

1526 1527
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
				      void *not_used, void **return_value)
1528
{
1529
	struct acpi_device *device = NULL;
1530 1531
	int type;
	unsigned long long sta;
1532
	acpi_status status;
1533 1534
	int result;

1535 1536 1537 1538
	acpi_bus_get_device(handle, &device);
	if (device)
		goto out;

1539 1540 1541 1542
	result = acpi_bus_type_and_status(handle, &type, &sta);
	if (result)
		return AE_OK;

1543 1544 1545 1546 1547
	if (type == ACPI_BUS_TYPE_POWER) {
		acpi_add_power_resource(handle);
		return AE_OK;
	}

1548
	if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1549
	    !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1550 1551 1552 1553
		struct acpi_device_wakeup wakeup;
		acpi_handle temp;

		status = acpi_get_handle(handle, "_PRW", &temp);
1554
		if (ACPI_SUCCESS(status)) {
1555 1556
			acpi_bus_extract_wakeup_device_power_package(handle,
								     &wakeup);
1557 1558
			acpi_power_resources_list_free(&wakeup.resources);
		}
1559
		return AE_CTRL_DEPTH;
1560
	}
1561

1562
	acpi_add_single_object(&device, handle, type, sta);
1563
	if (!device)
1564
		return AE_CTRL_DEPTH;
L
Linus Torvalds 已提交
1565

1566
 out:
1567 1568
	if (!*return_value)
		*return_value = device;
1569

1570 1571
	return AE_OK;
}
1572

1573 1574
static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
					  void *not_used, void **ret_not_used)
1575
{
1576
	const struct acpi_device_id *id;
1577 1578 1579 1580
	acpi_status status = AE_OK;
	struct acpi_device *device;
	unsigned long long sta_not_used;
	int type_not_used;
1581

1582 1583 1584 1585 1586 1587
	/*
	 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
	 * namespace walks prematurely.
	 */
	if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
		return AE_OK;
L
Linus Torvalds 已提交
1588

1589 1590
	if (acpi_bus_get_device(handle, &device))
		return AE_CTRL_DEPTH;
1591

1592 1593
	id = __acpi_match_device(device, acpi_platform_device_ids);
	if (id) {
1594
		/* This is a known good platform device. */
1595
		acpi_create_platform_device(device, id->driver_data);
1596
	} else if (device_attach(&device->dev) < 0) {
1597
		status = AE_CTRL_DEPTH;
1598 1599
	}
	return status;
L
Linus Torvalds 已提交
1600 1601
}

1602
/**
1603
 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1604
 * @handle: Root of the namespace scope to scan.
1605
 *
1606 1607
 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
 * found devices.
1608
 *
1609 1610 1611 1612
 * If no devices were found, -ENODEV is returned, but it does not mean that
 * there has been a real error.  There just have been no suitable ACPI objects
 * in the table trunk from which the kernel could create a device and add an
 * appropriate driver.
1613
 */
1614
int acpi_bus_scan(acpi_handle handle)
1615
{
1616
	void *device = NULL;
1617 1618 1619
	int error = 0;

	mutex_lock(&acpi_scan_lock);
1620

1621 1622 1623
	if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				    acpi_bus_check_add, NULL, NULL, &device);
1624

1625
	if (!device)
1626 1627
		error = -ENODEV;
	else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1628 1629
		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				    acpi_bus_device_attach, NULL, NULL, NULL);
1630

1631 1632
	mutex_unlock(&acpi_scan_lock);
	return error;
1633
}
1634
EXPORT_SYMBOL(acpi_bus_scan);
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Linus Torvalds 已提交
1635

1636 1637
static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
					  void *not_used, void **ret_not_used)
L
Linus Torvalds 已提交
1638
{
1639
	struct acpi_device *device = NULL;
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Len Brown 已提交
1640

1641 1642 1643 1644 1645 1646
	if (!acpi_bus_get_device(handle, &device)) {
		device->removal_type = ACPI_BUS_REMOVAL_EJECT;
		device_release_driver(&device->dev);
	}
	return AE_OK;
}
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Linus Torvalds 已提交
1647

1648 1649 1650 1651
static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
				   void *not_used, void **ret_not_used)
{
	struct acpi_device *device = NULL;
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Linus Torvalds 已提交
1652

1653 1654
	if (!acpi_bus_get_device(handle, &device))
		acpi_device_unregister(device);
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Linus Torvalds 已提交
1655

1656 1657
	return AE_OK;
}
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1658

1659
void acpi_bus_trim(struct acpi_device *start)
L
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1660
{
1661 1662
	mutex_lock(&acpi_scan_lock);

1663 1664 1665 1666 1667 1668 1669
	/*
	 * Execute acpi_bus_device_detach() as a post-order callback to detach
	 * all ACPI drivers from the device nodes being removed.
	 */
	acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
			    acpi_bus_device_detach, NULL, NULL);
	acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1670 1671 1672 1673 1674 1675 1676
	/*
	 * Execute acpi_bus_remove() as a post-order callback to remove device
	 * nodes in the given namespace scope.
	 */
	acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
			    acpi_bus_remove, NULL, NULL);
	acpi_bus_remove(start->handle, 0, NULL, NULL);
1677 1678

	mutex_unlock(&acpi_scan_lock);
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Linus Torvalds 已提交
1679
}
1680 1681
EXPORT_SYMBOL_GPL(acpi_bus_trim);

1682
static int acpi_bus_scan_fixed(void)
L
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1683
{
L
Len Brown 已提交
1684
	int result = 0;
L
Li Shaohua 已提交
1685

L
Linus Torvalds 已提交
1686 1687 1688
	/*
	 * Enumerate all fixed-feature devices.
	 */
1689 1690 1691
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
		struct acpi_device *device = NULL;

1692
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
1693
						ACPI_BUS_TYPE_POWER_BUTTON,
1694 1695 1696 1697 1698 1699 1700 1701
						ACPI_STA_DEFAULT);
		if (result)
			return result;

		result = device_attach(&device->dev);
		if (result < 0)
			return result;

1702
		device_init_wakeup(&device->dev, true);
1703
	}
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Linus Torvalds 已提交
1704

1705 1706 1707
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
		struct acpi_device *device = NULL;

1708
		result = acpi_add_single_object(&device, NULL,
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Li Shaohua 已提交
1709
						ACPI_BUS_TYPE_SLEEP_BUTTON,
1710 1711 1712 1713 1714
						ACPI_STA_DEFAULT);
		if (result)
			return result;

		result = device_attach(&device->dev);
1715
	}
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Linus Torvalds 已提交
1716

1717
	return result < 0 ? result : 0;
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1718 1719
}

1720
int __init acpi_scan_init(void)
L
Linus Torvalds 已提交
1721 1722 1723
{
	int result;

1724 1725 1726 1727 1728 1729
	result = bus_register(&acpi_bus_type);
	if (result) {
		/* We don't want to quit even if we failed to add suspend/resume */
		printk(KERN_ERR PREFIX "Could not register bus type\n");
	}

1730
	acpi_pci_root_init();
1731
	acpi_csrt_init();
1732

L
Linus Torvalds 已提交
1733 1734 1735
	/*
	 * Enumerate devices in the ACPI namespace.
	 */
1736 1737 1738
	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
	if (result)
		return result;
L
Linus Torvalds 已提交
1739

1740
	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
L
Linus Torvalds 已提交
1741
	if (result)
1742
		return result;
L
Linus Torvalds 已提交
1743

1744 1745
	result = acpi_bus_scan_fixed();
	if (result) {
1746
		acpi_device_unregister(acpi_root);
1747 1748
		return result;
	}
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Linus Torvalds 已提交
1749

1750 1751
	acpi_update_all_gpes();
	return 0;
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1752
}