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linux/drivers/acpi/scan.c
Kay Sievers 312c004d36 [PATCH] driver core: replace "hotplug" by "uevent" 
Leave the overloaded "hotplug" word to susbsystems which are handling
real devices. The driver core does not "plug" anything, it just exports
the state to userspace and generates events.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-01-04 16:18:08 -08:00

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/*
* scan.c - support for transforming the ACPI namespace into individual objects
*/
#include <linux/module.h>
#include <linux/init.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_bus_trim(struct acpi_device *start, int rmdevice);
static void acpi_device_release(struct kobject *kobj)
{
struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);
kfree(dev->pnp.cid_list);
kfree(dev);
}
struct acpi_device_attribute {
struct attribute attr;
ssize_t(*show) (struct acpi_device *, char *);
ssize_t(*store) (struct acpi_device *, const char *, size_t);
};
typedef void acpi_device_sysfs_files(struct kobject *,
const struct attribute *);
static void setup_sys_fs_device_files(struct acpi_device *dev,
acpi_device_sysfs_files * func);
#define create_sysfs_device_files(dev) \
setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
#define remove_sysfs_device_files(dev) \
setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
#define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
#define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
static ssize_t acpi_device_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct acpi_device *device = to_acpi_device(kobj);
struct acpi_device_attribute *attribute = to_handle_attr(attr);
return attribute->show ? attribute->show(device, buf) : -EIO;
}
static ssize_t acpi_device_attr_store(struct kobject *kobj,
struct attribute *attr, const char *buf,
size_t len)
{
struct acpi_device *device = to_acpi_device(kobj);
struct acpi_device_attribute *attribute = to_handle_attr(attr);
return attribute->store ? attribute->store(device, buf, len) : -EIO;
}
static struct sysfs_ops acpi_device_sysfs_ops = {
.show = acpi_device_attr_show,
.store = acpi_device_attr_store,
};
static struct kobj_type ktype_acpi_ns = {
.sysfs_ops = &acpi_device_sysfs_ops,
.release = acpi_device_release,
};
static int namespace_uevent(struct kset *kset, struct kobject *kobj,
char **envp, int num_envp, char *buffer,
int buffer_size)
{
struct acpi_device *dev = to_acpi_device(kobj);
int i = 0;
int len = 0;
if (!dev->driver)
return 0;
if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
"PHYSDEVDRIVER=%s", dev->driver->name))
return -ENOMEM;
envp[i] = NULL;
return 0;
}
static struct kset_uevent_ops namespace_uevent_ops = {
.uevent = &namespace_uevent,
};
static struct kset acpi_namespace_kset = {
.kobj = {
.name = "namespace",
},
.subsys = &acpi_subsys,
.ktype = &ktype_acpi_ns,
.uevent_ops = &namespace_uevent_ops,
};
static void acpi_device_register(struct acpi_device *device,
struct acpi_device *parent)
{
/*
* Linkage
* -------
* Link this device to its parent and siblings.
*/
INIT_LIST_HEAD(&device->children);
INIT_LIST_HEAD(&device->node);
INIT_LIST_HEAD(&device->g_list);
INIT_LIST_HEAD(&device->wakeup_list);
spin_lock(&acpi_device_lock);
if (device->parent) {
list_add_tail(&device->node, &device->parent->children);
list_add_tail(&device->g_list, &device->parent->g_list);
} else
list_add_tail(&device->g_list, &acpi_device_list);
if (device->wakeup.flags.valid)
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
spin_unlock(&acpi_device_lock);
strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);
if (parent)
device->kobj.parent = &parent->kobj;
device->kobj.ktype = &ktype_acpi_ns;
device->kobj.kset = &acpi_namespace_kset;
kobject_register(&device->kobj);
create_sysfs_device_files(device);
}
static int acpi_device_unregister(struct acpi_device *device, int type)
{
spin_lock(&acpi_device_lock);
if (device->parent) {
list_del(&device->node);
list_del(&device->g_list);
} else
list_del(&device->g_list);
list_del(&device->wakeup_list);
spin_unlock(&acpi_device_lock);
acpi_detach_data(device->handle, acpi_bus_data_handler);
remove_sysfs_device_files(device);
kobject_unregister(&device->kobj);
return 0;
}
void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
{
ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
/* TBD */
return_VOID;
}
static int acpi_bus_get_power_flags(struct acpi_device *device)
{
acpi_status status = 0;
acpi_handle handle = NULL;
u32 i = 0;
ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
/*
* Power Management Flags
*/
status = acpi_get_handle(device->handle, "_PSC", &handle);
if (ACPI_SUCCESS(status))
device->power.flags.explicit_get = 1;
status = acpi_get_handle(device->handle, "_IRC", &handle);
if (ACPI_SUCCESS(status))
device->power.flags.inrush_current = 1;
/*
* Enumerate supported power management states
*/
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
struct acpi_device_power_state *ps = &device->power.states[i];
char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
/* Evaluate "_PRx" to se if power resources are referenced */
acpi_evaluate_reference(device->handle, object_name, NULL,
&ps->resources);
if (ps->resources.count) {
device->power.flags.power_resources = 1;
ps->flags.valid = 1;
}
/* Evaluate "_PSx" to see if we can do explicit sets */
object_name[2] = 'S';
status = acpi_get_handle(device->handle, object_name, &handle);
if (ACPI_SUCCESS(status)) {
ps->flags.explicit_set = 1;
ps->flags.valid = 1;
}
/* State is valid if we have some power control */
if (ps->resources.count || ps->flags.explicit_set)
ps->flags.valid = 1;
ps->power = -1; /* Unknown - driver assigned */
ps->latency = -1; /* Unknown - driver assigned */
}
/* Set defaults for D0 and D3 states (always valid) */
device->power.states[ACPI_STATE_D0].flags.valid = 1;
device->power.states[ACPI_STATE_D0].power = 100;
device->power.states[ACPI_STATE_D3].flags.valid = 1;
device->power.states[ACPI_STATE_D3].power = 0;
/* TBD: System wake support and resource requirements. */
device->power.state = ACPI_STATE_UNKNOWN;
return_VALUE(0);
}
int acpi_match_ids(struct acpi_device *device, char *ids)
{
int error = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
if (device->flags.hardware_id)
if (strstr(ids, device->pnp.hardware_id))
goto Done;
if (device->flags.compatible_ids) {
struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
int i;
/* compare multiple _CID entries against driver ids */
for (i = 0; i < cid_list->count; i++) {
if (strstr(ids, cid_list->id[i].value))
goto Done;
}
}
error = -ENOENT;
Done:
if (buffer.pointer)
acpi_os_free(buffer.pointer);
return error;
}
static acpi_status
acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
union acpi_object *package)
{
int i = 0;
union acpi_object *element = NULL;
if (!device || !package || (package->package.count < 2))
return AE_BAD_PARAMETER;
element = &(package->package.elements[0]);
if (!element)
return AE_BAD_PARAMETER;
if (element->type == ACPI_TYPE_PACKAGE) {
if ((element->package.count < 2) ||
(element->package.elements[0].type !=
ACPI_TYPE_LOCAL_REFERENCE)
|| (element->package.elements[1].type != ACPI_TYPE_INTEGER))
return AE_BAD_DATA;
device->wakeup.gpe_device =
element->package.elements[0].reference.handle;
device->wakeup.gpe_number =
(u32) element->package.elements[1].integer.value;
} else if (element->type == ACPI_TYPE_INTEGER) {
device->wakeup.gpe_number = element->integer.value;
} else
return AE_BAD_DATA;
element = &(package->package.elements[1]);
if (element->type != ACPI_TYPE_INTEGER) {
return AE_BAD_DATA;
}
device->wakeup.sleep_state = element->integer.value;
if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
return AE_NO_MEMORY;
}
device->wakeup.resources.count = package->package.count - 2;
for (i = 0; i < device->wakeup.resources.count; i++) {
element = &(package->package.elements[i + 2]);
if (element->type != ACPI_TYPE_ANY) {
return AE_BAD_DATA;
}
device->wakeup.resources.handles[i] = element->reference.handle;
}
return AE_OK;
}
static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
{
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *package = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
/* _PRW */
status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
goto end;
}
package = (union acpi_object *)buffer.pointer;
status = acpi_bus_extract_wakeup_device_power_package(device, package);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error extracting _PRW package\n"));
goto end;
}
acpi_os_free(buffer.pointer);
device->wakeup.flags.valid = 1;
/* Power button, Lid switch always enable wakeup */
if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
device->wakeup.flags.run_wake = 1;
end:
if (ACPI_FAILURE(status))
device->flags.wake_capable = 0;
return_VALUE(0);
}
/* --------------------------------------------------------------------------
ACPI sysfs device file support
-------------------------------------------------------------------------- */
static ssize_t acpi_eject_store(struct acpi_device *device,
const char *buf, size_t count);
#define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
static struct acpi_device_attribute acpi_device_attr_##_name = \
__ATTR(_name, _mode, _show, _store)
ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
/**
* setup_sys_fs_device_files - sets up the device files under device namespace
* @dev: acpi_device object
* @func: function pointer to create or destroy the device file
*/
static void
setup_sys_fs_device_files(struct acpi_device *dev,
acpi_device_sysfs_files * func)
{
acpi_status status;
acpi_handle temp = NULL;
/*
* If device has _EJ0, 'eject' file is created that is used to trigger
* hot-removal function from userland.
*/
status = acpi_get_handle(dev->handle, "_EJ0", &temp);
if (ACPI_SUCCESS(status))
(*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
}
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 acpi_device *device, const char *buf, size_t count)
{
int result;
int ret = count;
int islockable;
acpi_status status;
acpi_handle handle;
acpi_object_type type = 0;
if ((!count) || (buf[0] != '1')) {
return -EINVAL;
}
#ifndef FORCE_EJECT
if (device->driver == NULL) {
ret = -ENODEV;
goto err;
}
#endif
status = acpi_get_type(device->handle, &type);
if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
ret = -ENODEV;
goto err;
}
islockable = device->flags.lockable;
handle = device->handle;
if (type == ACPI_TYPE_PROCESSOR)
result = acpi_bus_trim(device, 0);
else
result = acpi_bus_trim(device, 1);
if (!result)
result = acpi_eject_operation(handle, islockable);
if (result) {
ret = -EBUSY;
}
err:
return ret;
}
/* --------------------------------------------------------------------------
Performance Management
-------------------------------------------------------------------------- */
static int acpi_bus_get_perf_flags(struct acpi_device *device)
{
device->performance.state = ACPI_STATE_UNKNOWN;
return 0;
}
/* --------------------------------------------------------------------------
Driver Management
-------------------------------------------------------------------------- */
static LIST_HEAD(acpi_bus_drivers);
static DECLARE_MUTEX(acpi_bus_drivers_lock);
/**
* acpi_bus_match
* --------------
* Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
* matches the specified driver's criteria.
*/
static int
acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver)
{
if (driver && driver->ops.match)
return driver->ops.match(device, driver);
return acpi_match_ids(device, driver->ids);
}
/**
* acpi_bus_driver_init
* --------------------
* Used to initialize a device via its device driver. Called whenever a
* driver is bound to a device. Invokes the driver's add() and start() ops.
*/
static int
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
if (!device || !driver)
return_VALUE(-EINVAL);
if (!driver->ops.add)
return_VALUE(-ENOSYS);
result = driver->ops.add(device);
if (result) {
device->driver = NULL;
acpi_driver_data(device) = NULL;
return_VALUE(result);
}
device->driver = driver;
/*
* TBD - Configuration Management: Assign resources to device based
* upon possible configuration and currently allocated resources.
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Driver successfully bound to device\n"));
return_VALUE(0);
}
static int acpi_start_single_object(struct acpi_device *device)
{
int result = 0;
struct acpi_driver *driver;
ACPI_FUNCTION_TRACE("acpi_start_single_object");
if (!(driver = device->driver))
return_VALUE(0);
if (driver->ops.start) {
result = driver->ops.start(device);
if (result && driver->ops.remove)
driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
}
return_VALUE(result);
}
static int acpi_driver_attach(struct acpi_driver *drv)
{
struct list_head *node, *next;
int count = 0;
ACPI_FUNCTION_TRACE("acpi_driver_attach");
spin_lock(&acpi_device_lock);
list_for_each_safe(node, next, &acpi_device_list) {
struct acpi_device *dev =
container_of(node, struct acpi_device, g_list);
if (dev->driver || !dev->status.present)
continue;
spin_unlock(&acpi_device_lock);
if (!acpi_bus_match(dev, drv)) {
if (!acpi_bus_driver_init(dev, drv)) {
acpi_start_single_object(dev);
atomic_inc(&drv->references);
count++;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found driver [%s] for device [%s]\n",
drv->name, dev->pnp.bus_id));
}
}
spin_lock(&acpi_device_lock);
}
spin_unlock(&acpi_device_lock);
return_VALUE(count);
}
static int acpi_driver_detach(struct acpi_driver *drv)
{
struct list_head *node, *next;
ACPI_FUNCTION_TRACE("acpi_driver_detach");
spin_lock(&acpi_device_lock);
list_for_each_safe(node, next, &acpi_device_list) {
struct acpi_device *dev =
container_of(node, struct acpi_device, g_list);
if (dev->driver == drv) {
spin_unlock(&acpi_device_lock);
if (drv->ops.remove)
drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL);
spin_lock(&acpi_device_lock);
dev->driver = NULL;
dev->driver_data = NULL;
atomic_dec(&drv->references);
}
}
spin_unlock(&acpi_device_lock);
return_VALUE(0);
}
/**
* acpi_bus_register_driver
* ------------------------
* Registers a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and binds. Returns the
* number of devices that were claimed by the driver, or a negative
* error status for failure.
*/
int acpi_bus_register_driver(struct acpi_driver *driver)
{
int count;
ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
if (acpi_disabled)
return_VALUE(-ENODEV);
if (!driver)
return_VALUE(-EINVAL);
spin_lock(&acpi_device_lock);
list_add_tail(&driver->node, &acpi_bus_drivers);
spin_unlock(&acpi_device_lock);
count = acpi_driver_attach(driver);
return_VALUE(count);
}
EXPORT_SYMBOL(acpi_bus_register_driver);
/**
* acpi_bus_unregister_driver
* --------------------------
* Unregisters a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and unbinds.
*/
int acpi_bus_unregister_driver(struct acpi_driver *driver)
{
int error = 0;
ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
if (driver) {
acpi_driver_detach(driver);
if (!atomic_read(&driver->references)) {
spin_lock(&acpi_device_lock);
list_del_init(&driver->node);
spin_unlock(&acpi_device_lock);
}
} else
error = -EINVAL;
return_VALUE(error);
}
EXPORT_SYMBOL(acpi_bus_unregister_driver);
/**
* acpi_bus_find_driver
* --------------------
* Parses the list of registered drivers looking for a driver applicable for
* the specified device.
*/
static int acpi_bus_find_driver(struct acpi_device *device)
{
int result = 0;
struct list_head *node, *next;
ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
spin_lock(&acpi_device_lock);
list_for_each_safe(node, next, &acpi_bus_drivers) {
struct acpi_driver *driver =
container_of(node, struct acpi_driver, node);
atomic_inc(&driver->references);
spin_unlock(&acpi_device_lock);
if (!acpi_bus_match(device, driver)) {
result = acpi_bus_driver_init(device, driver);
if (!result)
goto Done;
}
atomic_dec(&driver->references);
spin_lock(&acpi_device_lock);
}
spin_unlock(&acpi_device_lock);
Done:
return_VALUE(result);
}
/* --------------------------------------------------------------------------
Device Enumeration
-------------------------------------------------------------------------- */
static int acpi_bus_get_flags(struct acpi_device *device)
{
acpi_status status = AE_OK;
acpi_handle temp = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
/* Presence of _STA indicates 'dynamic_status' */
status = acpi_get_handle(device->handle, "_STA", &temp);
if (ACPI_SUCCESS(status))
device->flags.dynamic_status = 1;
/* Presence of _CID indicates 'compatible_ids' */
status = acpi_get_handle(device->handle, "_CID", &temp);
if (ACPI_SUCCESS(status))
device->flags.compatible_ids = 1;
/* Presence of _RMV indicates 'removable' */
status = acpi_get_handle(device->handle, "_RMV", &temp);
if (ACPI_SUCCESS(status))
device->flags.removable = 1;
/* Presence of _EJD|_EJ0 indicates 'ejectable' */
status = acpi_get_handle(device->handle, "_EJD", &temp);
if (ACPI_SUCCESS(status))
device->flags.ejectable = 1;
else {
status = acpi_get_handle(device->handle, "_EJ0", &temp);
if (ACPI_SUCCESS(status))
device->flags.ejectable = 1;
}
/* Presence of _LCK indicates 'lockable' */
status = acpi_get_handle(device->handle, "_LCK", &temp);
if (ACPI_SUCCESS(status))
device->flags.lockable = 1;
/* Presence of _PS0|_PR0 indicates 'power manageable' */
status = acpi_get_handle(device->handle, "_PS0", &temp);
if (ACPI_FAILURE(status))
status = acpi_get_handle(device->handle, "_PR0", &temp);
if (ACPI_SUCCESS(status))
device->flags.power_manageable = 1;
/* Presence of _PRW indicates wake capable */
status = acpi_get_handle(device->handle, "_PRW", &temp);
if (ACPI_SUCCESS(status))
device->flags.wake_capable = 1;
/* TBD: Peformance management */
return_VALUE(0);
}
static void acpi_device_get_busid(struct acpi_device *device,
acpi_handle handle, int type)
{
char bus_id[5] = { '?', 0 };
struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
int i = 0;
/*
* Bus ID
* ------
* The device's Bus ID is simply the object name.
* TBD: Shouldn't this value be unique (within the ACPI namespace)?
*/
switch (type) {
case ACPI_BUS_TYPE_SYSTEM:
strcpy(device->pnp.bus_id, "ACPI");
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
strcpy(device->pnp.bus_id, "PWRF");
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
strcpy(device->pnp.bus_id, "SLPF");
break;
default:
acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
/* Clean up trailing underscores (if any) */
for (i = 3; i > 1; i--) {
if (bus_id[i] == '_')
bus_id[i] = '\0';
else
break;
}
strcpy(device->pnp.bus_id, bus_id);
break;
}
}
static void acpi_device_set_id(struct acpi_device *device,
struct acpi_device *parent, acpi_handle handle,
int type)
{
struct acpi_device_info *info;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
char *hid = NULL;
char *uid = NULL;
struct acpi_compatible_id_list *cid_list = NULL;
acpi_status status;
switch (type) {
case ACPI_BUS_TYPE_DEVICE:
status = acpi_get_object_info(handle, &buffer);
if (ACPI_FAILURE(status)) {
printk("%s: Error reading device info\n", __FUNCTION__);
return;
}
info = buffer.pointer;
if (info->valid & ACPI_VALID_HID)
hid = info->hardware_id.value;
if (info->valid & ACPI_VALID_UID)
uid = info->unique_id.value;
if (info->valid & ACPI_VALID_CID)
cid_list = &info->compatibility_id;
if (info->valid & ACPI_VALID_ADR) {
device->pnp.bus_address = info->address;
device->flags.bus_address = 1;
}
break;
case ACPI_BUS_TYPE_POWER:
hid = ACPI_POWER_HID;
break;
case ACPI_BUS_TYPE_PROCESSOR:
hid = ACPI_PROCESSOR_HID;
break;
case ACPI_BUS_TYPE_SYSTEM:
hid = ACPI_SYSTEM_HID;
break;
case ACPI_BUS_TYPE_THERMAL:
hid = ACPI_THERMAL_HID;
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
hid = ACPI_BUTTON_HID_POWERF;
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
hid = ACPI_BUTTON_HID_SLEEPF;
break;
}
/*
* \_SB
* ----
* Fix for the system root bus device -- the only root-level device.
*/
if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
hid = ACPI_BUS_HID;
strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
}
if (hid) {
strcpy(device->pnp.hardware_id, hid);
device->flags.hardware_id = 1;
}
if (uid) {
strcpy(device->pnp.unique_id, uid);
device->flags.unique_id = 1;
}
if (cid_list) {
device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
if (device->pnp.cid_list)
memcpy(device->pnp.cid_list, cid_list, cid_list->size);
else
printk(KERN_ERR "Memory allocation error\n");
}
acpi_os_free(buffer.pointer);
}
static int acpi_device_set_context(struct acpi_device *device, int type)
{
acpi_status status = AE_OK;
int result = 0;
/*
* Context
* -------
* Attach this 'struct acpi_device' to the ACPI object. This makes
* resolutions from handle->device very efficient. Note that we need
* to be careful with fixed-feature devices as they all attach to the
* root object.
*/
if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
status = acpi_attach_data(device->handle,
acpi_bus_data_handler, device);
if (ACPI_FAILURE(status)) {
printk("Error attaching device data\n");
result = -ENODEV;
}
}
return result;
}
static void acpi_device_get_debug_info(struct acpi_device *device,
acpi_handle handle, int type)
{
#ifdef CONFIG_ACPI_DEBUG_OUTPUT
char *type_string = NULL;
char name[80] = { '?', '\0' };
struct acpi_buffer buffer = { sizeof(name), name };
switch (type) {
case ACPI_BUS_TYPE_DEVICE:
type_string = "Device";
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
break;
case ACPI_BUS_TYPE_POWER:
type_string = "Power Resource";
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
break;
case ACPI_BUS_TYPE_PROCESSOR:
type_string = "Processor";
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
break;
case ACPI_BUS_TYPE_SYSTEM:
type_string = "System";
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
break;
case ACPI_BUS_TYPE_THERMAL:
type_string = "Thermal Zone";
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
type_string = "Power Button";
sprintf(name, "PWRB");
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
type_string = "Sleep Button";
sprintf(name, "SLPB");
break;
}
printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
#endif /*CONFIG_ACPI_DEBUG_OUTPUT */
}
static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
{
int result = 0;
struct acpi_driver *driver;
ACPI_FUNCTION_TRACE("acpi_bus_remove");
if (!dev)
return_VALUE(-EINVAL);
driver = dev->driver;
if ((driver) && (driver->ops.remove)) {
if (driver->ops.stop) {
result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
if (result)
return_VALUE(result);
}
result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
if (result) {
return_VALUE(result);
}
atomic_dec(&dev->driver->references);
dev->driver = NULL;
acpi_driver_data(dev) = NULL;
}
if (!rmdevice)
return_VALUE(0);
if (dev->flags.bus_address) {
if ((dev->parent) && (dev->parent->ops.unbind))
dev->parent->ops.unbind(dev);
}
acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
return_VALUE(0);
}
static int
acpi_add_single_object(struct acpi_device **child,
struct acpi_device *parent, acpi_handle handle, int type)
{
int result = 0;
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_add_single_object");
if (!child)
return_VALUE(-EINVAL);
device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
if (!device) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
return_VALUE(-ENOMEM);
}
memset(device, 0, sizeof(struct acpi_device));
device->handle = handle;
device->parent = parent;
acpi_device_get_busid(device, handle, type);
/*
* Flags
* -----
* Get prior to calling acpi_bus_get_status() so we know whether
* or not _STA is present. Note that we only look for object
* handles -- cannot evaluate objects until we know the device is
* present and properly initialized.
*/
result = acpi_bus_get_flags(device);
if (result)
goto end;
/*
* Status
* ------
* See if the device is present. We always assume that non-Device
* and non-Processor objects (e.g. thermal zones, power resources,
* etc.) are present, functioning, etc. (at least when parent object
* is present). Note that _STA has a different meaning for some
* objects (e.g. power resources) so we need to be careful how we use
* it.
*/
switch (type) {
case ACPI_BUS_TYPE_PROCESSOR:
case ACPI_BUS_TYPE_DEVICE:
result = acpi_bus_get_status(device);
if (ACPI_FAILURE(result) || !device->status.present) {
result = -ENOENT;
goto end;
}
break;
default:
STRUCT_TO_INT(device->status) = 0x0F;
break;
}
/*
* Initialize Device
* -----------------
* TBD: Synch with Core's enumeration/initialization process.
*/
/*
* Hardware ID, Unique ID, & Bus Address
* -------------------------------------
*/
acpi_device_set_id(device, parent, handle, type);
/*
* Power Management
* ----------------
*/
if (device->flags.power_manageable) {
result = acpi_bus_get_power_flags(device);
if (result)
goto end;
}
/*
* Wakeup device management
*-----------------------
*/
if (device->flags.wake_capable) {
result = acpi_bus_get_wakeup_device_flags(device);
if (result)
goto end;
}
/*
* Performance Management
* ----------------------
*/
if (device->flags.performance_manageable) {
result = acpi_bus_get_perf_flags(device);
if (result)
goto end;
}
if ((result = acpi_device_set_context(device, type)))
goto end;
acpi_device_get_debug_info(device, handle, type);
acpi_device_register(device, parent);
/*
* Bind _ADR-Based Devices
* -----------------------
* If there's a a bus address (_ADR) then we utilize the parent's
* 'bind' function (if exists) to bind the ACPI- and natively-
* enumerated device representations.
*/
if (device->flags.bus_address) {
if (device->parent && device->parent->ops.bind)
device->parent->ops.bind(device);
}
/*
* Locate & Attach Driver
* ----------------------
* If there's a hardware id (_HID) or compatible ids (_CID) we check
* to see if there's a driver installed for this kind of device. Note
* that drivers can install before or after a device is enumerated.
*
* TBD: Assumes LDM provides driver hot-plug capability.
*/
acpi_bus_find_driver(device);
end:
if (!result)
*child = device;
else {
kfree(device->pnp.cid_list);
kfree(device);
}
return_VALUE(result);
}
static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
{
acpi_status status = AE_OK;
struct acpi_device *parent = NULL;
struct acpi_device *child = NULL;
acpi_handle phandle = NULL;
acpi_handle chandle = NULL;
acpi_object_type type = 0;
u32 level = 1;
ACPI_FUNCTION_TRACE("acpi_bus_scan");
if (!start)
return_VALUE(-EINVAL);
parent = start;
phandle = start->handle;
/*
* Parse through the ACPI namespace, identify all 'devices', and
* create a new 'struct acpi_device' for each.
*/
while ((level > 0) && parent) {
status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
chandle, &chandle);
/*
* If this scope is exhausted then move our way back up.
*/
if (ACPI_FAILURE(status)) {
level--;
chandle = phandle;
acpi_get_parent(phandle, &phandle);
if (parent->parent)
parent = parent->parent;
continue;
}
status = acpi_get_type(chandle, &type);
if (ACPI_FAILURE(status))
continue;
/*
* If this is a scope object then parse it (depth-first).
*/
if (type == ACPI_TYPE_LOCAL_SCOPE) {
level++;
phandle = chandle;
chandle = NULL;
continue;
}
/*
* We're only interested in objects that we consider 'devices'.
*/
switch (type) {
case ACPI_TYPE_DEVICE:
type = ACPI_BUS_TYPE_DEVICE;
break;
case ACPI_TYPE_PROCESSOR:
type = ACPI_BUS_TYPE_PROCESSOR;
break;
case ACPI_TYPE_THERMAL:
type = ACPI_BUS_TYPE_THERMAL;
break;
case ACPI_TYPE_POWER:
type = ACPI_BUS_TYPE_POWER;
break;
default:
continue;
}
if (ops->acpi_op_add)
status = acpi_add_single_object(&child, parent,
chandle, type);
else
status = acpi_bus_get_device(chandle, &child);
if (ACPI_FAILURE(status))
continue;
if (ops->acpi_op_start) {
status = acpi_start_single_object(child);
if (ACPI_FAILURE(status))
continue;
}
/*
* If the device is present, enabled, and functioning then
* parse its scope (depth-first). Note that we need to
* represent absent devices to facilitate PnP notifications
* -- but only the subtree head (not all of its children,
* which will be enumerated when the parent is inserted).
*
* TBD: Need notifications and other detection mechanisms
* in place before we can fully implement this.
*/
if (child->status.present) {
status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
NULL, NULL);
if (ACPI_SUCCESS(status)) {
level++;
phandle = chandle;
chandle = NULL;
parent = child;
}
}
}
return_VALUE(0);
}
int
acpi_bus_add(struct acpi_device **child,
struct acpi_device *parent, acpi_handle handle, int type)
{
int result;
struct acpi_bus_ops ops;
ACPI_FUNCTION_TRACE("acpi_bus_add");
result = acpi_add_single_object(child, parent, handle, type);
if (!result) {
memset(&ops, 0, sizeof(ops));
ops.acpi_op_add = 1;
result = acpi_bus_scan(*child, &ops);
}
return_VALUE(result);
}
EXPORT_SYMBOL(acpi_bus_add);
int acpi_bus_start(struct acpi_device *device)
{
int result;
struct acpi_bus_ops ops;
ACPI_FUNCTION_TRACE("acpi_bus_start");
if (!device)
return_VALUE(-EINVAL);
result = acpi_start_single_object(device);
if (!result) {
memset(&ops, 0, sizeof(ops));
ops.acpi_op_start = 1;
result = acpi_bus_scan(device, &ops);
}
return_VALUE(result);
}
EXPORT_SYMBOL(acpi_bus_start);
static int acpi_bus_trim(struct acpi_device *start, int rmdevice)
{
acpi_status status;
struct acpi_device *parent, *child;
acpi_handle phandle, chandle;
acpi_object_type type;
u32 level = 1;
int err = 0;
parent = start;
phandle = start->handle;
child = chandle = NULL;
while ((level > 0) && parent && (!err)) {
status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
chandle, &chandle);
/*
* If this scope is exhausted then move our way back up.
*/
if (ACPI_FAILURE(status)) {
level--;
chandle = phandle;
acpi_get_parent(phandle, &phandle);
child = parent;
parent = parent->parent;
if (level == 0)
err = acpi_bus_remove(child, rmdevice);
else
err = acpi_bus_remove(child, 1);
continue;
}
status = acpi_get_type(chandle, &type);
if (ACPI_FAILURE(status)) {
continue;
}
/*
* If there is a device corresponding to chandle then
* parse it (depth-first).
*/
if (acpi_bus_get_device(chandle, &child) == 0) {
level++;
phandle = chandle;
chandle = NULL;
parent = child;
}
continue;
}
return err;
}
static int acpi_bus_scan_fixed(struct acpi_device *root)
{
int result = 0;
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
if (!root)
return_VALUE(-ENODEV);
/*
* Enumerate all fixed-feature devices.
*/
if (acpi_fadt.pwr_button == 0) {
result = acpi_add_single_object(&device, acpi_root,
NULL,
ACPI_BUS_TYPE_POWER_BUTTON);
if (!result)
result = acpi_start_single_object(device);
}
if (acpi_fadt.sleep_button == 0) {
result = acpi_add_single_object(&device, acpi_root,
NULL,
ACPI_BUS_TYPE_SLEEP_BUTTON);
if (!result)
result = acpi_start_single_object(device);
}
return_VALUE(result);
}
static int __init acpi_scan_init(void)
{
int result;
struct acpi_bus_ops ops;
ACPI_FUNCTION_TRACE("acpi_scan_init");
if (acpi_disabled)
return_VALUE(0);
kset_register(&acpi_namespace_kset);
/*
* Create the root device in the bus's device tree
*/
result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
ACPI_BUS_TYPE_SYSTEM);
if (result)
goto Done;
result = acpi_start_single_object(acpi_root);
/*
* Enumerate devices in the ACPI namespace.
*/
result = acpi_bus_scan_fixed(acpi_root);
if (!result) {
memset(&ops, 0, sizeof(ops));
ops.acpi_op_add = 1;
ops.acpi_op_start = 1;
result = acpi_bus_scan(acpi_root, &ops);
}
if (result)
acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
Done:
return_VALUE(result);
}
subsys_initcall(acpi_scan_init);
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