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linux-next/drivers/acpi/scan.c
Kay Sievers 7eff2e7a8b Driver core: change add_uevent_var to use a struct 
This changes the uevent buffer functions to use a struct instead of a
long list of parameters. It does no longer require the caller to do the
proper buffer termination and size accounting, which is currently wrong
in some places. It fixes a known bug where parts of the uevent
environment are overwritten because of wrong index calculations.

Many thanks to Mathieu Desnoyers for finding bugs and improving the
error handling.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-10-12 14:51:01 -07:00

1494 lines
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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/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 "LNXSYBUS"
#define ACPI_BUS_DEVICE_NAME "System Bus"
static LIST_HEAD(acpi_device_list);
static LIST_HEAD(acpi_bus_id_list);
DEFINE_SPINLOCK(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);
struct acpi_device_bus_id{
char bus_id[15];
unsigned int instance_no;
struct list_head node;
};
/*
* 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"
*/
static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
int size)
{
int len;
if (!acpi_dev->flags.hardware_id)
return -ENODEV;
len = snprintf(modalias, size, "acpi:%s:",
acpi_dev->pnp.hardware_id);
if (len < 0 || len >= size)
return -EINVAL;
size -= len;
if (acpi_dev->flags.compatible_ids) {
struct acpi_compatible_id_list *cid_list;
int i;
int count;
cid_list = acpi_dev->pnp.cid_list;
for (i = 0; i < cid_list->count; i++) {
count = snprintf(&modalias[len], size, "%s:",
cid_list->id[i].value);
if (count < 0 || count >= size) {
printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",
acpi_dev->pnp.device_name, i);
break;
}
len += count;
size -= count;
}
}
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);
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;
}
islockable = acpi_device->flags.lockable;
handle = acpi_device->handle;
result = acpi_bus_trim(acpi_device, 1);
if (!result)
result = acpi_eject_operation(handle, islockable);
if (result) {
ret = -EBUSY;
}
err:
return ret;
}
static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
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);
return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
}
static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
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;
result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
if(result)
goto end;
result = sprintf(buf, "%s\n", (char*)path.pointer);
kfree(path.pointer);
end:
return result;
}
static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
static int acpi_device_setup_files(struct acpi_device *dev)
{
acpi_status status;
acpi_handle temp;
int result = 0;
/*
* Devices gotten from FADT don't have a "path" attribute
*/
if(dev->handle) {
result = device_create_file(&dev->dev, &dev_attr_path);
if(result)
goto end;
}
if(dev->flags.hardware_id) {
result = device_create_file(&dev->dev, &dev_attr_hid);
if(result)
goto end;
}
if (dev->flags.hardware_id || dev->flags.compatible_ids){
result = device_create_file(&dev->dev, &dev_attr_modalias);
if(result)
goto end;
}
/*
* 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))
result = device_create_file(&dev->dev, &dev_attr_eject);
end:
return result;
}
static void acpi_device_remove_files(struct acpi_device *dev)
{
acpi_status status;
acpi_handle temp;
/*
* 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))
device_remove_file(&dev->dev, &dev_attr_eject);
if (dev->flags.hardware_id || dev->flags.compatible_ids)
device_remove_file(&dev->dev, &dev_attr_modalias);
if(dev->flags.hardware_id)
device_remove_file(&dev->dev, &dev_attr_hid);
if(dev->handle)
device_remove_file(&dev->dev, &dev_attr_path);
}
/* --------------------------------------------------------------------------
ACPI Bus operations
-------------------------------------------------------------------------- */
int acpi_match_device_ids(struct acpi_device *device,
const struct acpi_device_id *ids)
{
const struct acpi_device_id *id;
if (device->flags.hardware_id) {
for (id = ids; id->id[0]; id++) {
if (!strcmp((char*)id->id, device->pnp.hardware_id))
return 0;
}
}
if (device->flags.compatible_ids) {
struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
int i;
for (id = ids; id->id[0]; id++) {
/* compare multiple _CID entries against driver ids */
for (i = 0; i < cid_list->count; i++) {
if (!strcmp((char*)id->id,
cid_list->id[i].value))
return 0;
}
}
}
return -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);
static void acpi_device_release(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
kfree(acpi_dev->pnp.cid_list);
kfree(acpi_dev);
}
static int acpi_device_suspend(struct device *dev, pm_message_t state)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = acpi_dev->driver;
if (acpi_drv && acpi_drv->ops.suspend)
return acpi_drv->ops.suspend(acpi_dev, state);
return 0;
}
static int acpi_device_resume(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = acpi_dev->driver;
if (acpi_drv && acpi_drv->ops.resume)
return acpi_drv->ops.resume(acpi_dev);
return 0;
}
static int acpi_bus_match(struct device *dev, struct device_driver *drv)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = to_acpi_driver(drv);
return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
}
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
int len;
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;
return 0;
}
static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
static int acpi_start_single_object(struct acpi_device *);
static int acpi_device_probe(struct device * dev)
{
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) {
if (acpi_dev->bus_ops.acpi_op_start)
acpi_start_single_object(acpi_dev);
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;
}
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) {
if (acpi_drv->ops.stop)
acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
if (acpi_drv->ops.remove)
acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
}
acpi_dev->driver = NULL;
acpi_driver_data(dev) = NULL;
put_device(dev);
return 0;
}
static void acpi_device_shutdown(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_driver *acpi_drv = acpi_dev->driver;
if (acpi_drv && acpi_drv->ops.shutdown)
acpi_drv->ops.shutdown(acpi_dev);
return ;
}
struct bus_type acpi_bus_type = {
.name = "acpi",
.suspend = acpi_device_suspend,
.resume = acpi_device_resume,
.shutdown = acpi_device_shutdown,
.match = acpi_bus_match,
.probe = acpi_device_probe,
.remove = acpi_device_remove,
.uevent = acpi_device_uevent,
};
static int acpi_device_register(struct acpi_device *device,
struct acpi_device *parent)
{
int result;
struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
int found = 0;
/*
* 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);
new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
if (!new_bus_id) {
printk(KERN_ERR PREFIX "Memory allocation error\n");
return -ENOMEM;
}
spin_lock(&acpi_device_lock);
/*
* 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) {
if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
acpi_device_bus_id->instance_no ++;
found = 1;
kfree(new_bus_id);
break;
}
}
if(!found) {
acpi_device_bus_id = new_bus_id;
strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
acpi_device_bus_id->instance_no = 0;
list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
}
sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
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);
if (device->parent)
device->dev.parent = &parent->dev;
device->dev.bus = &acpi_bus_type;
device_initialize(&device->dev);
device->dev.release = &acpi_device_release;
result = device_add(&device->dev);
if(result) {
printk("Error adding device %s", device->dev.bus_id);
goto end;
}
result = acpi_device_setup_files(device);
if(result)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
return 0;
end:
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);
return result;
}
static void 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);
acpi_device_remove_files(device);
device_unregister(&device->dev);
}
/* --------------------------------------------------------------------------
Driver Management
-------------------------------------------------------------------------- */
/**
* acpi_bus_driver_init - add a device to a driver
* @device: the device to add and initialize
* @driver: driver for the device
*
* Used to initialize a device via its device driver. Called whenever a
* driver is bound to a device. Invokes the driver's add() ops.
*/
static int
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
{
int result = 0;
if (!device || !driver)
return -EINVAL;
if (!driver->ops.add)
return -ENOSYS;
result = driver->ops.add(device);
if (result) {
device->driver = NULL;
acpi_driver_data(device) = NULL;
return 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 0;
}
static int acpi_start_single_object(struct acpi_device *device)
{
int result = 0;
struct acpi_driver *driver;
if (!(driver = device->driver))
return 0;
if (driver->ops.start) {
result = driver->ops.start(device);
if (result && driver->ops.remove)
driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
}
return result;
}
/**
* 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)
{
int ret;
if (acpi_disabled)
return -ENODEV;
driver->drv.name = driver->name;
driver->drv.bus = &acpi_bus_type;
driver->drv.owner = driver->owner;
ret = driver_register(&driver->drv);
return ret;
}
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)
{
driver_unregister(&driver->drv);
}
EXPORT_SYMBOL(acpi_bus_unregister_driver);
/* --------------------------------------------------------------------------
Device Enumeration
-------------------------------------------------------------------------- */
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;
status = acpi_get_handle(NULL, obj->string.pointer, ejd);
kfree(buffer.pointer);
}
return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
{
/* TBD */
return;
}
static int acpi_bus_get_perf_flags(struct acpi_device *device)
{
device->performance.state = ACPI_STATE_UNKNOWN;
return 0;
}
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;
struct acpi_device_id button_device_ids[] = {
{"PNP0C0D", 0},
{"PNP0C0C", 0},
{"PNP0C0E", 0},
{"", 0},
};
/* _PRW */
status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
goto end;
}
package = (union acpi_object *)buffer.pointer;
status = acpi_bus_extract_wakeup_device_power_package(device, package);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
goto end;
}
kfree(buffer.pointer);
device->wakeup.flags.valid = 1;
/* Power button, Lid switch always enable wakeup */
if (!acpi_match_device_ids(device, button_device_ids))
device->wakeup.flags.run_wake = 1;
end:
if (ACPI_FAILURE(status))
device->flags.wake_capable = 0;
return 0;
}
static int acpi_bus_get_power_flags(struct acpi_device *device)
{
acpi_status status = 0;
acpi_handle handle = NULL;
u32 i = 0;
/*
* 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 0;
}
static int acpi_bus_get_flags(struct acpi_device *device)
{
acpi_status status = AE_OK;
acpi_handle temp = NULL;
/* 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 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 int
acpi_video_bus_match(struct acpi_device *device)
{
acpi_handle h_dummy1;
acpi_handle h_dummy2;
acpi_handle h_dummy3;
if (!device)
return -EINVAL;
/* Since there is no HID, CID for ACPI Video drivers, we have
* to check well known required nodes for each feature we support.
*/
/* Does this device able to support video switching ? */
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) &&
ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2)))
return 0;
/* Does this device able to retrieve a video ROM ? */
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1)))
return 0;
/* Does this device able to configure which video head to be POSTed ? */
if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) &&
ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) &&
ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3)))
return 0;
return -ENODEV;
}
/*
* 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;
}
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;
}
if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){
status = acpi_video_bus_match(device);
if(ACPI_SUCCESS(status))
hid = ACPI_VIDEO_HID;
status = acpi_bay_match(device);
if (ACPI_SUCCESS(status))
hid = ACPI_BAY_HID;
}
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 (((acpi_handle)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");
}
kfree(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 int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
{
if (!dev)
return -EINVAL;
dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
device_release_driver(&dev->dev);
if (!rmdevice)
return 0;
/*
* unbind _ADR-Based Devices when hot removal
*/
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 0;
}
static int
acpi_add_single_object(struct acpi_device **child,
struct acpi_device *parent, acpi_handle handle, int type,
struct acpi_bus_ops *ops)
{
int result = 0;
struct acpi_device *device = NULL;
if (!child)
return -EINVAL;
device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
if (!device) {
printk(KERN_ERR PREFIX "Memory allocation error\n");
return -ENOMEM;
}
device->handle = handle;
device->parent = parent;
device->bus_ops = *ops; /* workround for not call .start */
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) =
ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
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;
result = acpi_device_register(device, parent);
/*
* Bind _ADR-Based Devices when hot add
*/
if (device->flags.bus_address) {
if (device->parent && device->parent->ops.bind)
device->parent->ops.bind(device);
}
end:
if (!result)
*child = device;
else {
kfree(device->pnp.cid_list);
kfree(device);
}
return 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;
if (!start)
return -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, ops);
else
status = acpi_bus_get_device(chandle, &child);
if (ACPI_FAILURE(status))
continue;
if (ops->acpi_op_start && !(ops->acpi_op_add)) {
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 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;
memset(&ops, 0, sizeof(ops));
ops.acpi_op_add = 1;
result = acpi_add_single_object(child, parent, handle, type, &ops);
if (!result)
result = acpi_bus_scan(*child, &ops);
return result;
}
EXPORT_SYMBOL(acpi_bus_add);
int acpi_bus_start(struct acpi_device *device)
{
int result;
struct acpi_bus_ops ops;
if (!device)
return -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 result;
}
EXPORT_SYMBOL(acpi_bus_start);
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;
}
EXPORT_SYMBOL_GPL(acpi_bus_trim);
static int acpi_bus_scan_fixed(struct acpi_device *root)
{
int result = 0;
struct acpi_device *device = NULL;
struct acpi_bus_ops ops;
if (!root)
return -ENODEV;
memset(&ops, 0, sizeof(ops));
ops.acpi_op_add = 1;
ops.acpi_op_start = 1;
/*
* Enumerate all fixed-feature devices.
*/
if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
result = acpi_add_single_object(&device, acpi_root,
NULL,
ACPI_BUS_TYPE_POWER_BUTTON,
&ops);
}
if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
result = acpi_add_single_object(&device, acpi_root,
NULL,
ACPI_BUS_TYPE_SLEEP_BUTTON,
&ops);
}
return result;
}
static int __init acpi_scan_init(void)
{
int result;
struct acpi_bus_ops ops;
if (acpi_disabled)
return 0;
memset(&ops, 0, sizeof(ops));
ops.acpi_op_add = 1;
ops.acpi_op_start = 1;
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");
}
/*
* 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, &ops);
if (result)
goto Done;
/*
* Enumerate devices in the ACPI namespace.
*/
result = acpi_bus_scan_fixed(acpi_root);
if (!result)
result = acpi_bus_scan(acpi_root, &ops);
if (result)
acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
Done:
return result;
}
subsys_initcall(acpi_scan_init);
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