path: root/drivers/acpi/scan.c

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

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/acpi.h>

#include <acpi/acpi_drivers.h>
#include <acpi/acinterp.h>	/* for acpi_ex_eisa_id_to_string() */

#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("scan")
#define STRUCT_TO_INT(s)	(*((int*)&s))
extern struct acpi_device *acpi_root;

#define ACPI_BUS_CLASS			"system_bus"
#define ACPI_BUS_HID			"ACPI_BUS"
#define ACPI_BUS_DRIVER_NAME		"ACPI Bus Driver"
#define ACPI_BUS_DEVICE_NAME		"System Bus"

static LIST_HEAD(acpi_device_list);
DEFINE_SPINLOCK(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);

static int acpi_eject_operation(acpi_handle handle, int lockable)
{
	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status = AE_OK;

	/*
	 * TBD: evaluate _PS3?
	 */

	if (lockable) {
		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);
	if (ACPI_FAILURE(status)) {
		return (-ENODEV);
	}

	return (0);
}

static ssize_t
acpi_eject_store(struct device *d, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int result;
	int ret = count;
	int islockable;
	acpi_status status;
	acpi_handle handle;
	acpi_object_type type = 0;
	struct acpi_device *acpi_device = to_acpi_device(d);

	if ((!count) || (buf[0] != '1')) {
		return -EINVAL;
	}
#ifndef FORCE_EJECT
	if (acpi_device->driver == NULL) {
		ret = -ENODEV;
		goto err;
	}
#endif
	status = acpi_get_type(acpi_device->handle, &type);
	if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
		ret = -ENODEV;
		goto err;