scan.c 46.4 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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static LIST_HEAD(acpi_scan_handlers_list);
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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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int acpi_scan_add_handler(struct acpi_scan_handler *handler)
{
	if (!handler || !handler->attach)
		return -EINVAL;

	list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
	return 0;
}

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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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	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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566
{
567
	struct acpi_device *acpi_dev = to_acpi_device(dev);
568
	int len;
569

570 571 572
	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

573 574 575 576 577 578 579
	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;
Z
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580
	return 0;
L
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581 582
}

583 584 585 586 587 588 589 590 591 592 593
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;

594 595
	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
596 597 598 599 600 601 602
	return AE_OK;
}

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

603
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
604 605 606 607
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_notify_fixed,
						     device);
608
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
		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)
{
626
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
627 628
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_notify_fixed);
629
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
630 631 632 633 634 635 636
		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);
}

637 638
static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
static int acpi_device_probe(struct device * dev)
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639
{
640 641 642 643 644 645
	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) {
646 647 648 649
		if (acpi_drv->ops.notify) {
			ret = acpi_device_install_notify_handler(acpi_dev);
			if (ret) {
				if (acpi_drv->ops.remove)
650
					acpi_drv->ops.remove(acpi_dev);
651 652 653 654
				return ret;
			}
		}

655 656 657 658 659 660 661
		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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662

663 664 665 666 667 668
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) {
669 670
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
671
		if (acpi_drv->ops.remove)
672
			acpi_drv->ops.remove(acpi_dev);
L
Linus Torvalds 已提交
673
	}
674
	acpi_dev->driver = NULL;
675
	acpi_dev->driver_data = NULL;
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676

677
	put_device(dev);
Z
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678 679
	return 0;
}
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680

681
struct bus_type acpi_bus_type = {
Z
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682
	.name		= "acpi",
683 684 685 686
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
Z
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687 688
};

689 690
int acpi_device_add(struct acpi_device *device,
		    void (*release)(struct device *))
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691
{
L
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692
	int result;
693 694
	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
	int found = 0;
695

696 697 698 699 700 701 702 703 704 705 706 707
	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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708 709 710 711 712 713 714 715
	/*
	 * 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);
716 717
	INIT_LIST_HEAD(&device->physical_node_list);
	mutex_init(&device->physical_node_lock);
718
	INIT_LIST_HEAD(&device->power_dependent);
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719

720 721
	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
	if (!new_bus_id) {
722 723 724
		pr_err(PREFIX "Memory allocation error\n");
		result = -ENOMEM;
		goto err_detach;
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Linus Torvalds 已提交
725
	}
726

727
	mutex_lock(&acpi_device_lock);
728 729 730 731 732
	/*
	 * 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) {
733 734 735
		if (!strcmp(acpi_device_bus_id->bus_id,
			    acpi_device_hid(device))) {
			acpi_device_bus_id->instance_no++;
736 737 738 739
			found = 1;
			kfree(new_bus_id);
			break;
		}
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Linus Torvalds 已提交
740
	}
741
	if (!found) {
742
		acpi_device_bus_id = new_bus_id;
743
		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
744 745
		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
746
	}
747
	dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
L
Linus Torvalds 已提交
748

L
Len Brown 已提交
749
	if (device->parent)
Z
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750
		list_add_tail(&device->node, &device->parent->children);
L
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751

Z
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752 753
	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
754
	mutex_unlock(&acpi_device_lock);
L
Linus Torvalds 已提交
755

756
	if (device->parent)
757
		device->dev.parent = &device->parent->dev;
758
	device->dev.bus = &acpi_bus_type;
759
	device->dev.release = release;
760
	result = device_add(&device->dev);
761
	if (result) {
762
		dev_err(&device->dev, "Error registering device\n");
763
		goto err;
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764 765
	}

766
	result = acpi_device_setup_files(device);
767
	if (result)
768 769
		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
		       dev_name(&device->dev));
L
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770

771
	device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
L
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772
	return 0;
773 774

 err:
775
	mutex_lock(&acpi_device_lock);
L
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776
	if (device->parent)
777 778
		list_del(&device->node);
	list_del(&device->wakeup_list);
779
	mutex_unlock(&acpi_device_lock);
780 781 782

 err_detach:
	acpi_detach_data(device->handle, acpi_bus_data_handler);
783
	return result;
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784 785
}

786
static void acpi_device_unregister(struct acpi_device *device)
Z
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787
{
788
	mutex_lock(&acpi_device_lock);
L
Len Brown 已提交
789
	if (device->parent)
Z
Zhang Rui 已提交
790
		list_del(&device->node);
L
Linus Torvalds 已提交
791

Z
Zhang Rui 已提交
792
	list_del(&device->wakeup_list);
793
	mutex_unlock(&acpi_device_lock);
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794

Z
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795
	acpi_detach_data(device->handle, acpi_bus_data_handler);
796

797
	acpi_power_add_remove_device(device, false);
P
Patrick Mochel 已提交
798
	acpi_device_remove_files(device);
799 800 801
	if (device->remove)
		device->remove(device);

802
	device_del(&device->dev);
803 804 805 806 807
	/*
	 * 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);
808
	put_device(&device->dev);
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809 810
}

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811 812 813
/* --------------------------------------------------------------------------
                                 Driver Management
   -------------------------------------------------------------------------- */
L
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814
/**
815 816 817 818
 * acpi_bus_driver_init - add a device to a driver
 * @device: the device to add and initialize
 * @driver: driver for the device
 *
819
 * Used to initialize a device via its device driver.  Called whenever a
820
 * driver is bound to a device.  Invokes the driver's add() ops.
L
Linus Torvalds 已提交
821 822
 */
static int
L
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823
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
L
Linus Torvalds 已提交
824
{
L
Len Brown 已提交
825
	int result = 0;
L
Linus Torvalds 已提交
826 827

	if (!device || !driver)
828
		return -EINVAL;
L
Linus Torvalds 已提交
829 830

	if (!driver->ops.add)
831
		return -ENOSYS;
L
Linus Torvalds 已提交
832 833 834 835

	result = driver->ops.add(device);
	if (result) {
		device->driver = NULL;
836
		device->driver_data = NULL;
837
		return result;
L
Linus Torvalds 已提交
838 839 840 841 842 843 844 845 846
	}

	device->driver = driver;

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

L
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847 848
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver successfully bound to device\n"));
849
	return 0;
850 851
}

Z
Zhang Rui 已提交
852 853 854 855 856 857 858 859 860
/**
 * 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
861
{
862
	int ret;
L
Linus Torvalds 已提交
863

Z
Zhang Rui 已提交
864 865
	if (acpi_disabled)
		return -ENODEV;
866 867 868
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;
L
Linus Torvalds 已提交
869

870 871
	ret = driver_register(&driver->drv);
	return ret;
Z
Zhang Rui 已提交
872
}
L
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873

Z
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874 875 876 877 878 879 880 881 882 883 884
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)
{
885
	driver_unregister(&driver->drv);
Z
Zhang Rui 已提交
886 887 888 889 890 891 892
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
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
920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
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;
935 936
		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
					 ejd);
Z
Zhang Rui 已提交
937 938 939 940 941 942
		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

943
void acpi_bus_data_handler(acpi_handle handle, void *context)
Z
Zhang Rui 已提交
944 945 946 947 948 949 950
{

	/* TBD */

	return;
}

951 952
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
					struct acpi_device_wakeup *wakeup)
Z
Zhang Rui 已提交
953
{
954 955
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package = NULL;
Z
Zhang Rui 已提交
956
	union acpi_object *element = NULL;
957
	acpi_status status;
958
	int err = -ENODATA;
Z
Zhang Rui 已提交
959

960
	if (!wakeup)
961
		return -EINVAL;
Z
Zhang Rui 已提交
962

963
	INIT_LIST_HEAD(&wakeup->resources);
Z
Zhang Rui 已提交
964

965 966 967 968
	/* _PRW */
	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
969
		return err;
970 971 972 973
	}

	package = (union acpi_object *)buffer.pointer;

974
	if (!package || package->package.count < 2)
975 976
		goto out;

Z
Zhang Rui 已提交
977
	element = &(package->package.elements[0]);
978
	if (!element)
979
		goto out;
980

Z
Zhang Rui 已提交
981 982 983 984
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
985
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
986
			goto out;
987

988
		wakeup->gpe_device =
Z
Zhang Rui 已提交
989
		    element->package.elements[0].reference.handle;
990
		wakeup->gpe_number =
Z
Zhang Rui 已提交
991 992
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
993 994 995 996 997
		wakeup->gpe_device = NULL;
		wakeup->gpe_number = element->integer.value;
	} else {
		goto out;
	}
Z
Zhang Rui 已提交
998 999

	element = &(package->package.elements[1]);
1000
	if (element->type != ACPI_TYPE_INTEGER)
1001
		goto out;
1002

1003
	wakeup->sleep_state = element->integer.value;
Z
Zhang Rui 已提交
1004

1005 1006
	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
	if (err)
1007
		goto out;
Z
Zhang Rui 已提交
1008

1009 1010
	if (!list_empty(&wakeup->resources)) {
		int sleep_state;
Z
Zhang Rui 已提交
1011

1012 1013 1014 1015 1016 1017 1018 1019
		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
1020
	acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1021

1022 1023
 out:
	kfree(buffer.pointer);
1024
	return err;
L
Linus Torvalds 已提交
1025 1026
}

1027
static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1028
{
1029 1030
	struct acpi_device_id button_device_ids[] = {
		{"PNP0C0C", 0},
1031
		{"PNP0C0D", 0},
1032 1033 1034
		{"PNP0C0E", 0},
		{"", 0},
	};
1035 1036 1037
	acpi_status status;
	acpi_event_status event_status;

1038
	device->wakeup.flags.notifier_present = 0;
1039 1040 1041 1042

	/* Power button, Lid switch always enable wakeup */
	if (!acpi_match_device_ids(device, button_device_ids)) {
		device->wakeup.flags.run_wake = 1;
1043 1044 1045 1046 1047
		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;
		}
1048
		device_set_wakeup_capable(&device->dev, true);
1049 1050 1051
		return;
	}

1052 1053 1054
	status = acpi_get_gpe_status(device->wakeup.gpe_device,
					device->wakeup.gpe_number,
						&event_status);
1055 1056 1057 1058 1059
	if (status == AE_OK)
		device->wakeup.flags.run_wake =
				!!(event_status & ACPI_EVENT_FLAG_HANDLE);
}

1060
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1061
{
1062
	acpi_handle temp;
1063
	acpi_status status = 0;
1064
	int err;
1065

1066 1067 1068 1069 1070
	/* Presence of _PRW indicates wake capable */
	status = acpi_get_handle(device->handle, "_PRW", &temp);
	if (ACPI_FAILURE(status))
		return;

1071 1072 1073 1074
	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
							   &device->wakeup);
	if (err) {
		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1075
		return;
Z
Zhang Rui 已提交
1076
	}
L
Linus Torvalds 已提交
1077

Z
Zhang Rui 已提交
1078
	device->wakeup.flags.valid = 1;
1079
	device->wakeup.prepare_count = 0;
1080
	acpi_bus_set_run_wake_flags(device);
1081 1082 1083 1084 1085 1086
	/* 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.
	 */
1087 1088
	err = acpi_device_sleep_wake(device, 0, 0, 0);
	if (err)
1089 1090
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				"error in _DSW or _PSW evaluation\n"));
L
Linus Torvalds 已提交
1091 1092
}

1093 1094 1095
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
	struct acpi_device_power_state *ps = &device->power.states[state];
1096 1097
	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1098 1099
	acpi_handle handle;
	acpi_status status;
1100

1101 1102
	INIT_LIST_HEAD(&ps->resources);

1103 1104 1105 1106 1107 1108 1109 1110
	/* 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) {
1111 1112 1113
			int err = acpi_extract_power_resources(package, 0,
							       &ps->resources);
			if (!err)
1114
				device->power.flags.power_resources = 1;
1115
		}
1116
		ACPI_FREE(buffer.pointer);
1117 1118 1119
	}

	/* Evaluate "_PSx" to see if we can do explicit sets */
1120 1121
	pathname[2] = 'S';
	status = acpi_get_handle(device->handle, pathname, &handle);
1122 1123 1124 1125 1126 1127 1128
	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.
	 */
1129
	if (!list_empty(&ps->resources)
1130 1131 1132 1133 1134 1135 1136 1137 1138
	    || (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 */
}

1139
static void acpi_bus_get_power_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1140
{
1141 1142 1143
	acpi_status status;
	acpi_handle handle;
	u32 i;
B
Bjorn Helgaas 已提交
1144

1145 1146 1147 1148 1149 1150 1151 1152 1153
	/* 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
1154

Z
Zhang Rui 已提交
1155 1156 1157 1158 1159 1160 1161 1162 1163
	/*
	 * 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
1164

Z
Zhang Rui 已提交
1165 1166 1167
	/*
	 * Enumerate supported power management states
	 */
1168 1169
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
		acpi_bus_init_power_state(device, i);
1170

1171
	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
L
Linus Torvalds 已提交
1172

Z
Zhang Rui 已提交
1173 1174 1175 1176 1177
	/* 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
1178

1179 1180 1181 1182
	/* 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;

1183 1184 1185 1186 1187
	/* 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;

1188
	acpi_bus_init_power(device);
Z
Zhang Rui 已提交
1189
}
L
Len Brown 已提交
1190

1191
static void acpi_bus_get_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1192
{
L
Len Brown 已提交
1193 1194
	acpi_status status = AE_OK;
	acpi_handle temp = NULL;
L
Linus Torvalds 已提交
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216

	/* 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;
	}
}

1217
static void acpi_device_get_busid(struct acpi_device *device)
L
Linus Torvalds 已提交
1218
{
L
Len Brown 已提交
1219 1220 1221
	char bus_id[5] = { '?', 0 };
	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
	int i = 0;
L
Linus Torvalds 已提交
1222 1223 1224 1225 1226 1227 1228

	/*
	 * Bus ID
	 * ------
	 * The device's Bus ID is simply the object name.
	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
	 */
1229
	if (ACPI_IS_ROOT_DEVICE(device)) {
L
Linus Torvalds 已提交
1230
		strcpy(device->pnp.bus_id, "ACPI");
1231 1232 1233 1234
		return;
	}

	switch (device->device_type) {
L
Linus Torvalds 已提交
1235 1236 1237 1238 1239 1240 1241
	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:
1242
		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
L
Linus Torvalds 已提交
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
		/* 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;
	}
}

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 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290
/*
 * 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;
}

1291 1292 1293 1294 1295 1296 1297 1298 1299
/*
 * 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);
}

1300
const char *acpi_device_hid(struct acpi_device *device)
1301
{
1302
	struct acpi_hardware_id *hid;
1303

1304 1305 1306
	if (list_empty(&device->pnp.ids))
		return dummy_hid;

1307 1308 1309 1310
	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
	return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
1311

1312 1313 1314
static void acpi_add_id(struct acpi_device *device, const char *dev_id)
{
	struct acpi_hardware_id *id;
1315

1316 1317 1318
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return;
1319

T
Thomas Meyer 已提交
1320
	id->id = kstrdup(dev_id, GFP_KERNEL);
1321 1322 1323
	if (!id->id) {
		kfree(id);
		return;
1324 1325
	}

1326
	list_add_tail(&id->list, &device->pnp.ids);
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 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
/*
 * 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;
}

1364
static void acpi_device_set_id(struct acpi_device *device)
L
Linus Torvalds 已提交
1365
{
L
Len Brown 已提交
1366
	acpi_status status;
1367
	struct acpi_device_info *info;
1368
	struct acpi_pnp_device_id_list *cid_list;
1369
	int i;
L
Linus Torvalds 已提交
1370

1371
	switch (device->device_type) {
L
Linus Torvalds 已提交
1372
	case ACPI_BUS_TYPE_DEVICE:
1373
		if (ACPI_IS_ROOT_DEVICE(device)) {
1374
			acpi_add_id(device, ACPI_SYSTEM_HID);
1375 1376 1377
			break;
		}

1378
		status = acpi_get_object_info(device->handle, &info);
L
Linus Torvalds 已提交
1379
		if (ACPI_FAILURE(status)) {
1380
			printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
L
Linus Torvalds 已提交
1381 1382 1383 1384
			return;
		}

		if (info->valid & ACPI_VALID_HID)
1385 1386
			acpi_add_id(device, info->hardware_id.string);
		if (info->valid & ACPI_VALID_CID) {
1387
			cid_list = &info->compatible_id_list;
1388 1389 1390
			for (i = 0; i < cid_list->count; i++)
				acpi_add_id(device, cid_list->ids[i].string);
		}
L
Linus Torvalds 已提交
1391 1392 1393 1394
		if (info->valid & ACPI_VALID_ADR) {
			device->pnp.bus_address = info->address;
			device->flags.bus_address = 1;
		}
1395 1396 1397
		if (info->valid & ACPI_VALID_UID)
			device->pnp.unique_id = kstrdup(info->unique_id.string,
							GFP_KERNEL);
1398

1399 1400
		kfree(info);

1401 1402 1403 1404
		/*
		 * Some devices don't reliably have _HIDs & _CIDs, so add
		 * synthetic HIDs to make sure drivers can find them.
		 */
1405
		if (acpi_is_video_device(device))
1406
			acpi_add_id(device, ACPI_VIDEO_HID);
1407
		else if (ACPI_SUCCESS(acpi_bay_match(device)))
1408
			acpi_add_id(device, ACPI_BAY_HID);
1409
		else if (ACPI_SUCCESS(acpi_dock_match(device)))
1410
			acpi_add_id(device, ACPI_DOCK_HID);
1411 1412
		else if (!acpi_ibm_smbus_match(device))
			acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1413
		else if (list_empty(&device->pnp.ids) &&
1414 1415 1416 1417 1418
			 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);
		}
1419

L
Linus Torvalds 已提交
1420 1421
		break;
	case ACPI_BUS_TYPE_POWER:
1422
		acpi_add_id(device, ACPI_POWER_HID);
L
Linus Torvalds 已提交
1423 1424
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
1425
		acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
L
Linus Torvalds 已提交
1426 1427
		break;
	case ACPI_BUS_TYPE_THERMAL:
1428
		acpi_add_id(device, ACPI_THERMAL_HID);
L
Linus Torvalds 已提交
1429 1430
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
1431
		acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
L
Linus Torvalds 已提交
1432 1433
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1434
		acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
L
Linus Torvalds 已提交
1435 1436 1437 1438
		break;
	}
}

1439 1440
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
			     int type, unsigned long long sta)
L
Linus Torvalds 已提交
1441
{
1442 1443 1444 1445 1446 1447 1448 1449
	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);
1450
	device->flags.match_driver = false;
1451 1452 1453
	device_initialize(&device->dev);
	dev_set_uevent_suppress(&device->dev, true);
}
1454

1455 1456
void acpi_device_add_finalize(struct acpi_device *device)
{
1457
	device->flags.match_driver = true;
1458 1459
	dev_set_uevent_suppress(&device->dev, false);
	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
L
Linus Torvalds 已提交
1460 1461
}

1462 1463
static int acpi_add_single_object(struct acpi_device **child,
				  acpi_handle handle, int type,
1464
				  unsigned long long sta)
L
Linus Torvalds 已提交
1465
{
1466 1467
	int result;
	struct acpi_device *device;
1468
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
L
Linus Torvalds 已提交
1469

1470
	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
L
Linus Torvalds 已提交
1471
	if (!device) {
1472
		printk(KERN_ERR PREFIX "Memory allocation error\n");
1473
		return -ENOMEM;
L
Linus Torvalds 已提交
1474 1475
	}

1476 1477
	acpi_init_device_object(device, handle, type, sta);
	acpi_bus_get_power_flags(device);
1478
	acpi_bus_get_wakeup_device_flags(device);
L
Linus Torvalds 已提交
1479

1480
	result = acpi_device_add(device, acpi_device_release);
1481
	if (result) {
1482
		acpi_device_release(&device->dev);
1483 1484
		return result;
	}
L
Linus Torvalds 已提交
1485

1486
	acpi_power_add_remove_device(device, true);
1487
	acpi_device_add_finalize(device);
1488 1489 1490 1491 1492 1493 1494
	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;
1495 1496
}

1497 1498
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
				    unsigned long long *sta)
L
Linus Torvalds 已提交
1499
{
1500 1501
	acpi_status status;
	acpi_object_type acpi_type;
L
Linus Torvalds 已提交
1502

1503
	status = acpi_get_type(handle, &acpi_type);
1504
	if (ACPI_FAILURE(status))
1505
		return -ENODEV;
L
Len Brown 已提交
1506

1507
	switch (acpi_type) {
1508 1509
	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
	case ACPI_TYPE_DEVICE:
1510 1511 1512 1513
		*type = ACPI_BUS_TYPE_DEVICE;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1514 1515
		break;
	case ACPI_TYPE_PROCESSOR:
1516 1517 1518 1519
		*type = ACPI_BUS_TYPE_PROCESSOR;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1520 1521
		break;
	case ACPI_TYPE_THERMAL:
1522 1523
		*type = ACPI_BUS_TYPE_THERMAL;
		*sta = ACPI_STA_DEFAULT;
1524 1525
		break;
	case ACPI_TYPE_POWER:
1526 1527
		*type = ACPI_BUS_TYPE_POWER;
		*sta = ACPI_STA_DEFAULT;
1528 1529
		break;
	default:
1530
		return -ENODEV;
1531
	}
L
Linus Torvalds 已提交
1532

1533 1534 1535
	return 0;
}

1536 1537
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
				      void *not_used, void **return_value)
1538
{
1539
	struct acpi_device *device = NULL;
1540 1541
	int type;
	unsigned long long sta;
1542
	acpi_status status;
1543 1544
	int result;

1545 1546 1547 1548
	acpi_bus_get_device(handle, &device);
	if (device)
		goto out;

1549 1550 1551 1552
	result = acpi_bus_type_and_status(handle, &type, &sta);
	if (result)
		return AE_OK;

1553 1554 1555 1556 1557
	if (type == ACPI_BUS_TYPE_POWER) {
		acpi_add_power_resource(handle);
		return AE_OK;
	}

1558
	if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1559
	    !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1560 1561 1562 1563
		struct acpi_device_wakeup wakeup;
		acpi_handle temp;

		status = acpi_get_handle(handle, "_PRW", &temp);
1564
		if (ACPI_SUCCESS(status)) {
1565 1566
			acpi_bus_extract_wakeup_device_power_package(handle,
								     &wakeup);
1567 1568
			acpi_power_resources_list_free(&wakeup.resources);
		}
1569
		return AE_CTRL_DEPTH;
1570
	}
1571

1572
	acpi_add_single_object(&device, handle, type, sta);
1573
	if (!device)
1574
		return AE_CTRL_DEPTH;
L
Linus Torvalds 已提交
1575

1576
 out:
1577 1578
	if (!*return_value)
		*return_value = device;
1579

1580 1581
	return AE_OK;
}
1582

1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605
static int acpi_scan_attach_handler(struct acpi_device *device)
{
	struct acpi_scan_handler *handler;
	int ret = 0;

	list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
		const struct acpi_device_id *id;

		id = __acpi_match_device(device, handler->ids);
		if (!id)
			continue;

		ret = handler->attach(device, id);
		if (ret > 0) {
			device->handler = handler;
			break;
		} else if (ret < 0) {
			break;
		}
	}
	return ret;
}

1606 1607
static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
					  void *not_used, void **ret_not_used)
1608
{
1609
	const struct acpi_device_id *id;
1610 1611
	struct acpi_device *device;
	unsigned long long sta_not_used;
1612
	int ret;
1613

1614 1615 1616 1617
	/*
	 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
	 * namespace walks prematurely.
	 */
1618
	if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1619
		return AE_OK;
L
Linus Torvalds 已提交
1620

1621 1622
	if (acpi_bus_get_device(handle, &device))
		return AE_CTRL_DEPTH;
1623

1624 1625
	id = __acpi_match_device(device, acpi_platform_device_ids);
	if (id) {
1626
		/* This is a known good platform device. */
1627
		acpi_create_platform_device(device, id->driver_data);
1628
		return AE_OK;
1629
	}
1630 1631 1632 1633 1634 1635 1636

	ret = acpi_scan_attach_handler(device);
	if (ret)
		return ret > 0 ? AE_OK : AE_CTRL_DEPTH;

	ret = device_attach(&device->dev);
	return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
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Linus Torvalds 已提交
1637 1638
}

1639
/**
1640
 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1641
 * @handle: Root of the namespace scope to scan.
1642
 *
1643 1644
 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
 * found devices.
1645
 *
1646 1647 1648 1649
 * 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.
1650
 */
1651
int acpi_bus_scan(acpi_handle handle)
1652
{
1653
	void *device = NULL;
1654 1655 1656
	int error = 0;

	mutex_lock(&acpi_scan_lock);
1657

1658 1659 1660
	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);
1661

1662
	if (!device)
1663 1664
		error = -ENODEV;
	else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1665 1666
		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				    acpi_bus_device_attach, NULL, NULL, NULL);
1667

1668 1669
	mutex_unlock(&acpi_scan_lock);
	return error;
1670
}
1671
EXPORT_SYMBOL(acpi_bus_scan);
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Linus Torvalds 已提交
1672

1673 1674
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
1675
{
1676
	struct acpi_device *device = NULL;
L
Len Brown 已提交
1677

1678
	if (!acpi_bus_get_device(handle, &device)) {
1679 1680
		struct acpi_scan_handler *dev_handler = device->handler;

1681
		device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1682 1683 1684 1685 1686 1687 1688 1689
		if (dev_handler) {
			if (dev_handler->detach)
				dev_handler->detach(device);

			device->handler = NULL;
		} else {
			device_release_driver(&device->dev);
		}
1690 1691 1692
	}
	return AE_OK;
}
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Linus Torvalds 已提交
1693

1694 1695 1696 1697
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;
L
Linus Torvalds 已提交
1698

1699 1700
	if (!acpi_bus_get_device(handle, &device))
		acpi_device_unregister(device);
L
Linus Torvalds 已提交
1701

1702 1703
	return AE_OK;
}
L
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1704

1705
void acpi_bus_trim(struct acpi_device *start)
L
Linus Torvalds 已提交
1706
{
1707 1708
	mutex_lock(&acpi_scan_lock);

1709 1710 1711 1712 1713 1714 1715
	/*
	 * 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);
1716 1717 1718 1719 1720 1721 1722
	/*
	 * 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);
1723 1724

	mutex_unlock(&acpi_scan_lock);
L
Linus Torvalds 已提交
1725
}
1726 1727
EXPORT_SYMBOL_GPL(acpi_bus_trim);

1728
static int acpi_bus_scan_fixed(void)
L
Linus Torvalds 已提交
1729
{
L
Len Brown 已提交
1730
	int result = 0;
L
Li Shaohua 已提交
1731

L
Linus Torvalds 已提交
1732 1733 1734
	/*
	 * Enumerate all fixed-feature devices.
	 */
1735 1736 1737
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
		struct acpi_device *device = NULL;

1738
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
1739
						ACPI_BUS_TYPE_POWER_BUTTON,
1740 1741 1742 1743 1744 1745 1746 1747
						ACPI_STA_DEFAULT);
		if (result)
			return result;

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

1748
		device_init_wakeup(&device->dev, true);
1749
	}
L
Linus Torvalds 已提交
1750

1751 1752 1753
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
		struct acpi_device *device = NULL;

1754
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
1755
						ACPI_BUS_TYPE_SLEEP_BUTTON,
1756 1757 1758 1759 1760
						ACPI_STA_DEFAULT);
		if (result)
			return result;

		result = device_attach(&device->dev);
1761
	}
L
Linus Torvalds 已提交
1762

1763
	return result < 0 ? result : 0;
L
Linus Torvalds 已提交
1764 1765
}

1766
int __init acpi_scan_init(void)
L
Linus Torvalds 已提交
1767 1768 1769
{
	int result;

1770 1771 1772 1773 1774 1775
	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");
	}

1776
	acpi_pci_root_init();
1777
	acpi_csrt_init();
1778

L
Linus Torvalds 已提交
1779 1780 1781
	/*
	 * Enumerate devices in the ACPI namespace.
	 */
1782 1783 1784
	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
	if (result)
		return result;
L
Linus Torvalds 已提交
1785

1786
	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
L
Linus Torvalds 已提交
1787
	if (result)
1788
		return result;
L
Linus Torvalds 已提交
1789

1790 1791
	result = acpi_bus_scan_fixed();
	if (result) {
1792
		acpi_device_unregister(acpi_root);
1793 1794
		return result;
	}
L
Linus Torvalds 已提交
1795

1796 1797
	acpi_update_all_gpes();
	return 0;
L
Linus Torvalds 已提交
1798
}