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linux/drivers/acpi/scan.c
Yasuaki Ishimatsu a383b68d9f ACPI / scan: not cache _SUN value in struct acpi_device_pnp 
The _SUN device indentification object is not guaranteed to return
the same value every time it is executed, so we should not cache its
return value, but rather execute it every time as needed.  If it is
cached, an incorrect stale value may be used in some situations.

This issue was exposed by commit 202317a573 (ACPI / scan: Add
acpi_device objects for all device nodes in the namespace).  Fix it
by avoiding to cache the return value of _SUN.

Fixes: 202317a573 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: 3.14+ <stable@vger.kernel.org> # 3.14+
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-09-03 22:41:14 +02:00

2346 lines
59 KiB
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Raw Blame History

/*
* scan.c - support for transforming the ACPI namespace into individual objects
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/signal.h>
#include <linux/kthread.h>
#include <linux/dmi.h>
#include <linux/nls.h>
#include <asm/pgtable.h>
#include "internal.h"
#define _COMPONENT ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("scan");
extern struct acpi_device *acpi_root;
#define ACPI_BUS_CLASS "system_bus"
#define ACPI_BUS_HID "LNXSYBUS"
#define ACPI_BUS_DEVICE_NAME "System Bus"
#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
/*
* If set, devices will be hot-removed even if they cannot be put offline
* gracefully (from the kernel's standpoint).
*/
bool acpi_force_hot_remove;
static const char *dummy_hid = "device";
static LIST_HEAD(acpi_bus_id_list);
static DEFINE_MUTEX(acpi_scan_lock);
static LIST_HEAD(acpi_scan_handlers_list);
DEFINE_MUTEX(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);
static DEFINE_MUTEX(acpi_hp_context_lock);
struct acpi_device_bus_id{
char bus_id[15];
unsigned int instance_no;
struct list_head node;
};
void acpi_scan_lock_acquire(void)
{
mutex_lock(&acpi_scan_lock);
}
EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
void acpi_scan_lock_release(void)
{
mutex_unlock(&acpi_scan_lock);
}
EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
void acpi_lock_hp_context(void)
{
mutex_lock(&acpi_hp_context_lock);
}
void acpi_unlock_hp_context(void)
{
mutex_unlock(&acpi_hp_context_lock);
}
void acpi_initialize_hp_context(struct acpi_device *adev,
struct acpi_hotplug_context *hp,
int (*notify)(struct acpi_device *, u32),
void (*uevent)(struct acpi_device *, u32))
{
acpi_lock_hp_context();
hp->notify = notify;
hp->uevent = uevent;
acpi_set_hp_context(adev, hp);
acpi_unlock_hp_context();
}
EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
int acpi_scan_add_handler(struct acpi_scan_handler *handler)
{
if (!handler)
return -EINVAL;
list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
return 0;
}
int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
const char *hotplug_profile_name)
{
int error;
error = acpi_scan_add_handler(handler);
if (error)
return error;
acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
return 0;
}
/*
* 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"
* Return: 0: no _HID and no _CID
* -EINVAL: output error
* -ENOMEM: output is truncated
*/
static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
int size)
{
int len;
int count;
struct acpi_hardware_id *id;
if (list_empty(&acpi_dev->pnp.ids))
return 0;
len = snprintf(modalias, size, "acpi:");
size -= len;
list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
count = snprintf(&modalias[len], size, "%s:", id->id);
if (count < 0)
return EINVAL;
if (count >= size)
return -ENOMEM;
len += count;
size -= count;
}
modalias[len] = '\0';
return len;
}
/*
* Creates uevent modalias field for ACPI enumerated devices.
* Because the other buses does not support ACPI HIDs & CIDs.
* e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
* "acpi:IBM0001:ACPI0001"
*/
int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
{
struct acpi_device *acpi_dev;
int len;
acpi_dev = ACPI_COMPANION(dev);
if (!acpi_dev)
return -ENODEV;
/* Fall back to bus specific way of modalias exporting */
if (list_empty(&acpi_dev->pnp.ids))
return -ENODEV;
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 <= 0)
return len;
env->buflen += len;
return 0;
}
EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
/*
* Creates modalias sysfs attribute for ACPI enumerated devices.
* Because the other buses does not support ACPI HIDs & CIDs.
* e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
* "acpi:IBM0001:ACPI0001"
*/
int acpi_device_modalias(struct device *dev, char *buf, int size)
{
struct acpi_device *acpi_dev;
int len;
acpi_dev = ACPI_COMPANION(dev);
if (!acpi_dev)
return -ENODEV;
/* Fall back to bus specific way of modalias exporting */
if (list_empty(&acpi_dev->pnp.ids))
return -ENODEV;
len = create_modalias(acpi_dev, buf, size -1);
if (len <= 0)
return len;
buf[len++] = '\n';
return len;
}
EXPORT_SYMBOL_GPL(acpi_device_modalias);
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;
len = create_modalias(acpi_dev, buf, 1024);
if (len <= 0)
return len;
buf[len++] = '\n';
return len;
}
static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
{
struct acpi_device_physical_node *pn;
bool offline = true;
mutex_lock(&adev->physical_node_lock);
list_for_each_entry(pn, &adev->physical_node_list, node)
if (device_supports_offline(pn->dev) && !pn->dev->offline) {
if (uevent)
kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
offline = false;
break;
}
mutex_unlock(&adev->physical_node_lock);
return offline;
}
static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
void **ret_p)
{
struct acpi_device *device = NULL;
struct acpi_device_physical_node *pn;
bool second_pass = (bool)data;
acpi_status status = AE_OK;
if (acpi_bus_get_device(handle, &device))
return AE_OK;
if (device->handler && !device->handler->hotplug.enabled) {
*ret_p = &device->dev;
return AE_SUPPORT;
}
mutex_lock(&device->physical_node_lock);
list_for_each_entry(pn, &device->physical_node_list, node) {
int ret;
if (second_pass) {
/* Skip devices offlined by the first pass. */
if (pn->put_online)
continue;
} else {
pn->put_online = false;
}
ret = device_offline(pn->dev);
if (acpi_force_hot_remove)
continue;
if (ret >= 0) {
pn->put_online = !ret;
} else {
*ret_p = pn->dev;
if (second_pass) {
status = AE_ERROR;
break;
}
}
}
mutex_unlock(&device->physical_node_lock);
return status;
}
static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
void **ret_p)
{
struct acpi_device *device = NULL;
struct acpi_device_physical_node *pn;
if (acpi_bus_get_device(handle, &device))
return AE_OK;
mutex_lock(&device->physical_node_lock);
list_for_each_entry(pn, &device->physical_node_list, node)
if (pn->put_online) {
device_online(pn->dev);
pn->put_online = false;
}
mutex_unlock(&device->physical_node_lock);
return AE_OK;
}
static int acpi_scan_try_to_offline(struct acpi_device *device)
{
acpi_handle handle = device->handle;
struct device *errdev = NULL;
acpi_status status;
/*
* Carry out two passes here and ignore errors in the first pass,
* because if the devices in question are memory blocks and
* CONFIG_MEMCG is set, one of the blocks may hold data structures
* that the other blocks depend on, but it is not known in advance which
* block holds them.
*
* If the first pass is successful, the second one isn't needed, though.
*/
status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
NULL, acpi_bus_offline, (void *)false,
(void **)&errdev);
if (status == AE_SUPPORT) {
dev_warn(errdev, "Offline disabled.\n");
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
acpi_bus_online, NULL, NULL, NULL);
return -EPERM;
}
acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
if (errdev) {
errdev = NULL;
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
NULL, acpi_bus_offline, (void *)true,
(void **)&errdev);
if (!errdev || acpi_force_hot_remove)
acpi_bus_offline(handle, 0, (void *)true,
(void **)&errdev);
if (errdev && !acpi_force_hot_remove) {
dev_warn(errdev, "Offline failed.\n");
acpi_bus_online(handle, 0, NULL, NULL);
acpi_walk_namespace(ACPI_TYPE_ANY, handle,
ACPI_UINT32_MAX, acpi_bus_online,
NULL, NULL, NULL);
return -EBUSY;
}
}
return 0;
}
static int acpi_scan_hot_remove(struct acpi_device *device)
{
acpi_handle handle = device->handle;
unsigned long long sta;
acpi_status status;
if (device->handler && device->handler->hotplug.demand_offline
&& !acpi_force_hot_remove) {
if (!acpi_scan_is_offline(device, true))
return -EBUSY;
} else {
int error = acpi_scan_try_to_offline(device);
if (error)
return error;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Hot-removing device %s...\n", dev_name(&device->dev)));
acpi_bus_trim(device);
acpi_evaluate_lck(handle, 0);
/*
* TBD: _EJD support.
*/
status = acpi_evaluate_ej0(handle);
if (status == AE_NOT_FOUND)
return -ENODEV;
else if (ACPI_FAILURE(status))
return -EIO;
/*
* Verify if eject was indeed successful. If not, log an error
* message. No need to call _OST since _EJ0 call was made OK.
*/
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status)) {
acpi_handle_warn(handle,
"Status check after eject failed (0x%x)\n", status);
} else if (sta & ACPI_STA_DEVICE_ENABLED) {
acpi_handle_warn(handle,
"Eject incomplete - status 0x%llx\n", sta);
}
return 0;
}
static int acpi_scan_device_not_present(struct acpi_device *adev)
{
if (!acpi_device_enumerated(adev)) {
dev_warn(&adev->dev, "Still not present\n");
return -EALREADY;
}
acpi_bus_trim(adev);
return 0;
}
static int acpi_scan_device_check(struct acpi_device *adev)
{
int error;
acpi_bus_get_status(adev);
if (adev->status.present || adev->status.functional) {
/*
* This function is only called for device objects for which
* matching scan handlers exist. The only situation in which
* the scan handler is not attached to this device object yet
* is when the device has just appeared (either it wasn't
* present at all before or it was removed and then added
* again).
*/
if (adev->handler) {
dev_warn(&adev->dev, "Already enumerated\n");
return -EALREADY;
}
error = acpi_bus_scan(adev->handle);
if (error) {
dev_warn(&adev->dev, "Namespace scan failure\n");
return error;
}
if (!adev->handler) {
dev_warn(&adev->dev, "Enumeration failure\n");
error = -ENODEV;
}
} else {
error = acpi_scan_device_not_present(adev);
}
return error;
}
static int acpi_scan_bus_check(struct acpi_device *adev)
{
struct acpi_scan_handler *handler = adev->handler;
struct acpi_device *child;
int error;
acpi_bus_get_status(adev);
if (!(adev->status.present || adev->status.functional)) {
acpi_scan_device_not_present(adev);
return 0;
}
if (handler && handler->hotplug.scan_dependent)
return handler->hotplug.scan_dependent(adev);
error = acpi_bus_scan(adev->handle);
if (error) {
dev_warn(&adev->dev, "Namespace scan failure\n");
return error;
}
list_for_each_entry(child, &adev->children, node) {
error = acpi_scan_bus_check(child);
if (error)
return error;
}
return 0;
}
static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
{
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
return acpi_scan_bus_check(adev);
case ACPI_NOTIFY_DEVICE_CHECK:
return acpi_scan_device_check(adev);
case ACPI_NOTIFY_EJECT_REQUEST:
case ACPI_OST_EC_OSPM_EJECT:
if (adev->handler && !adev->handler->hotplug.enabled) {
dev_info(&adev->dev, "Eject disabled\n");
return -EPERM;
}
acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
return acpi_scan_hot_remove(adev);
}
return -EINVAL;
}
void acpi_device_hotplug(struct acpi_device *adev, u32 src)
{
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
int error = -ENODEV;
lock_device_hotplug();
mutex_lock(&acpi_scan_lock);
/*
* The device object's ACPI handle cannot become invalid as long as we
* are holding acpi_scan_lock, but it might have become invalid before
* that lock was acquired.
*/
if (adev->handle == INVALID_ACPI_HANDLE)
goto err_out;
if (adev->flags.is_dock_station) {
error = dock_notify(adev, src);
} else if (adev->flags.hotplug_notify) {
error = acpi_generic_hotplug_event(adev, src);
if (error == -EPERM) {
ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
goto err_out;
}
} else {
int (*notify)(struct acpi_device *, u32);
acpi_lock_hp_context();
notify = adev->hp ? adev->hp->notify : NULL;
acpi_unlock_hp_context();
/*
* There may be additional notify handlers for device objects
* without the .event() callback, so ignore them here.
*/
if (notify)
error = notify(adev, src);
else
goto out;
}
if (!error)
ost_code = ACPI_OST_SC_SUCCESS;
err_out:
acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
out:
acpi_bus_put_acpi_device(adev);
mutex_unlock(&acpi_scan_lock);
unlock_device_hotplug();
}
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);
static ssize_t
acpi_eject_store(struct device *d, struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi_device = to_acpi_device(d);
acpi_object_type not_used;
acpi_status status;
if (!count || buf[0] != '1')
return -EINVAL;
if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
&& !acpi_device->driver)
return -ENODEV;
status = acpi_get_type(acpi_device->handle, &not_used);
if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
return -ENODEV;
get_device(&acpi_device->dev);
status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
if (ACPI_SUCCESS(status))
return count;
put_device(&acpi_device->dev);
acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
}
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_device_hid(acpi_dev));
}
static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
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);
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);
/* 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);
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);
acpi_status status;
unsigned long long sun;
status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
if (ACPI_FAILURE(status))
return -ENODEV;
return sprintf(buf, "%llu\n", sun);
}
static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
static ssize_t status_show(struct device *dev, struct device_attribute *attr,
char *buf) {
struct acpi_device *acpi_dev = to_acpi_device(dev);
acpi_status status;
unsigned long long sta;
status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status))
return -ENODEV;
return sprintf(buf, "%llu\n", sta);
}
static DEVICE_ATTR_RO(status);
static int acpi_device_setup_files(struct acpi_device *dev)
{
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
acpi_status status;
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 (!list_empty(&dev->pnp.ids)) {
result = device_create_file(&dev->dev, &dev_attr_hid);
if (result)
goto end;
result = device_create_file(&dev->dev, &dev_attr_modalias);
if (result)
goto end;
}
/*
* If device has _STR, 'description' file is created
*/
if (acpi_has_method(dev->handle, "_STR")) {
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;
}
if (dev->pnp.type.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);
if (acpi_has_method(dev->handle, "_SUN")) {
result = device_create_file(&dev->dev, &dev_attr_sun);
if (result)
goto end;
}
if (acpi_has_method(dev->handle, "_STA")) {
result = device_create_file(&dev->dev, &dev_attr_status);
if (result)
goto end;
}
/*
* If device has _EJ0, 'eject' file is created that is used to trigger
* hot-removal function from userland.
*/
if (acpi_has_method(dev->handle, "_EJ0")) {
result = device_create_file(&dev->dev, &dev_attr_eject);
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);
}
end:
return result;
}
static void acpi_device_remove_files(struct acpi_device *dev)
{
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);
}
/*
* If device has _STR, remove 'description' file
*/
if (acpi_has_method(dev->handle, "_STR")) {
kfree(dev->pnp.str_obj);
device_remove_file(&dev->dev, &dev_attr_description);
}
/*
* If device has _EJ0, remove 'eject' file.
*/
if (acpi_has_method(dev->handle, "_EJ0"))
device_remove_file(&dev->dev, &dev_attr_eject);
if (acpi_has_method(dev->handle, "_SUN"))
device_remove_file(&dev->dev, &dev_attr_sun);
if (dev->pnp.unique_id)
device_remove_file(&dev->dev, &dev_attr_uid);
if (dev->pnp.type.bus_address)
device_remove_file(&dev->dev, &dev_attr_adr);
device_remove_file(&dev->dev, &dev_attr_modalias);
device_remove_file(&dev->dev, &dev_attr_hid);
if (acpi_has_method(dev->handle, "_STA"))
device_remove_file(&dev->dev, &dev_attr_status);
if (dev->handle)
device_remove_file(&dev->dev, &dev_attr_path);
}
/* --------------------------------------------------------------------------
ACPI Bus operations
-------------------------------------------------------------------------- */
static const struct acpi_device_id *__acpi_match_device(
struct acpi_device *device, const struct acpi_device_id *ids)
{
const struct acpi_device_id *id;
struct acpi_hardware_id *hwid;
/*
* If the device is not present, it is unnecessary to load device
* driver for it.
*/
if (!device->status.present)
return NULL;
for (id = ids; id->id[0]; id++)
list_for_each_entry(hwid, &device->pnp.ids, list)
if (!strcmp((char *) id->id, hwid->id))
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;
acpi_handle handle = ACPI_HANDLE(dev);
if (!ids || !handle || acpi_bus_get_device(handle, &adev))
return NULL;
return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
int acpi_match_device_ids(struct acpi_device *device,
const struct acpi_device_id *ids)
{
return __acpi_match_device(device, ids) ? 0 : -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);
static void acpi_free_power_resources_lists(struct acpi_device *device)
{
int i;
if (device->wakeup.flags.valid)
acpi_power_resources_list_free(&device->wakeup.resources);
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);
}
}
static void acpi_device_release(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
acpi_free_pnp_ids(&acpi_dev->pnp);
acpi_free_power_resources_lists(acpi_dev);
kfree(acpi_dev);
}
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_dev->flags.match_driver
&& !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 (list_empty(&acpi_dev->pnp.ids))
return 0;
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 <= 0)
return len;
env->buflen += len;
return 0;
}
static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_device *device = data;
device->driver->ops.notify(device, event);
}
static void acpi_device_notify_fixed(void *data)
{
struct acpi_device *device = data;
/* Fixed hardware devices have no handles */
acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
}
static acpi_status acpi_device_fixed_event(void *data)
{
acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
return AE_OK;
}
static int acpi_device_install_notify_handler(struct acpi_device *device)
{
acpi_status status;
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
status =
acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
acpi_device_fixed_event,
device);
else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
status =
acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
acpi_device_fixed_event,
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)
{
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
acpi_device_fixed_event);
else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
acpi_device_fixed_event);
else
acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
acpi_device_notify);
}
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;
if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
return -EINVAL;
if (!acpi_drv->ops.add)
return -ENOSYS;
ret = acpi_drv->ops.add(acpi_dev);
if (ret)
return ret;
acpi_dev->driver = acpi_drv;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Driver [%s] successfully bound to device [%s]\n",
acpi_drv->name, acpi_dev->pnp.bus_id));
if (acpi_drv->ops.notify) {
ret = acpi_device_install_notify_handler(acpi_dev);
if (ret) {
if (acpi_drv->ops.remove)
acpi_drv->ops.remove(acpi_dev);
acpi_dev->driver = NULL;
acpi_dev->driver_data = NULL;
return ret;
}
}
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 0;
}
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.notify)
acpi_device_remove_notify_handler(acpi_dev);
if (acpi_drv->ops.remove)
acpi_drv->ops.remove(acpi_dev);
}
acpi_dev->driver = NULL;
acpi_dev->driver_data = NULL;
put_device(dev);
return 0;
}
struct bus_type acpi_bus_type = {
.name = "acpi",
.match = acpi_bus_match,
.probe = acpi_device_probe,
.remove = acpi_device_remove,
.uevent = acpi_device_uevent,
};
static void acpi_device_del(struct acpi_device *device)
{
mutex_lock(&acpi_device_lock);
if (device->parent)
list_del(&device->node);
list_del(&device->wakeup_list);
mutex_unlock(&acpi_device_lock);
acpi_power_add_remove_device(device, false);
acpi_device_remove_files(device);
if (device->remove)
device->remove(device);
device_del(&device->dev);
}
static LIST_HEAD(acpi_device_del_list);
static DEFINE_MUTEX(acpi_device_del_lock);
static void acpi_device_del_work_fn(struct work_struct *work_not_used)
{
for (;;) {
struct acpi_device *adev;
mutex_lock(&acpi_device_del_lock);
if (list_empty(&acpi_device_del_list)) {
mutex_unlock(&acpi_device_del_lock);
break;
}
adev = list_first_entry(&acpi_device_del_list,
struct acpi_device, del_list);
list_del(&adev->del_list);
mutex_unlock(&acpi_device_del_lock);
acpi_device_del(adev);
/*
* Drop references to all power resources that might have been
* used by the device.
*/
acpi_power_transition(adev, ACPI_STATE_D3_COLD);
put_device(&adev->dev);
}
}
/**
* acpi_scan_drop_device - Drop an ACPI device object.
* @handle: Handle of an ACPI namespace node, not used.
* @context: Address of the ACPI device object to drop.
*
* This is invoked by acpi_ns_delete_node() during the removal of the ACPI
* namespace node the device object pointed to by @context is attached to.
*
* The unregistration is carried out asynchronously to avoid running
* acpi_device_del() under the ACPICA's namespace mutex and the list is used to
* ensure the correct ordering (the device objects must be unregistered in the
* same order in which the corresponding namespace nodes are deleted).
*/
static void acpi_scan_drop_device(acpi_handle handle, void *context)
{
static DECLARE_WORK(work, acpi_device_del_work_fn);
struct acpi_device *adev = context;
mutex_lock(&acpi_device_del_lock);
/*
* Use the ACPI hotplug workqueue which is ordered, so this work item
* won't run after any hotplug work items submitted subsequently. That
* prevents attempts to register device objects identical to those being
* deleted from happening concurrently (such attempts result from
* hotplug events handled via the ACPI hotplug workqueue). It also will
* run after all of the work items submitted previosuly, which helps
* those work items to ensure that they are not accessing stale device
* objects.
*/
if (list_empty(&acpi_device_del_list))
acpi_queue_hotplug_work(&work);
list_add_tail(&adev->del_list, &acpi_device_del_list);
/* Make acpi_ns_validate_handle() return NULL for this handle. */
adev->handle = INVALID_ACPI_HANDLE;
mutex_unlock(&acpi_device_del_lock);
}
static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
void (*callback)(void *))
{
acpi_status status;
if (!device)
return -EINVAL;
status = acpi_get_data_full(handle, acpi_scan_drop_device,
(void **)device, callback);
if (ACPI_FAILURE(status) || !*device) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
handle));
return -ENODEV;
}
return 0;
}
int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
{
return acpi_get_device_data(handle, device, NULL);
}
EXPORT_SYMBOL(acpi_bus_get_device);
static void get_acpi_device(void *dev)
{
if (dev)
get_device(&((struct acpi_device *)dev)->dev);
}
struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
{
struct acpi_device *adev = NULL;
acpi_get_device_data(handle, &adev, get_acpi_device);
return adev;
}
void acpi_bus_put_acpi_device(struct acpi_device *adev)
{
put_device(&adev->dev);
}
int acpi_device_add(struct acpi_device *device,
void (*release)(struct device *))
{
int result;
struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
int found = 0;
if (device->handle) {
acpi_status status;
status = acpi_attach_data(device->handle, acpi_scan_drop_device,
device);
if (ACPI_FAILURE(status)) {
acpi_handle_err(device->handle,
"Unable to attach device data\n");
return -ENODEV;
}
}
/*
* 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);
INIT_LIST_HEAD(&device->physical_node_list);
INIT_LIST_HEAD(&device->del_list);
mutex_init(&device->physical_node_lock);
new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
if (!new_bus_id) {
pr_err(PREFIX "Memory allocation error\n");
result = -ENOMEM;
goto err_detach;
}
mutex_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,
acpi_device_hid(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, acpi_device_hid(device));
acpi_device_bus_id->instance_no = 0;
list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
}
dev_set_name(&device->dev, "%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);
if (device->wakeup.flags.valid)
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
mutex_unlock(&acpi_device_lock);
if (device->parent)
device->dev.parent = &device->parent->dev;
device->dev.bus = &acpi_bus_type;
device->dev.release = release;
result = device_add(&device->dev);
if (result) {
dev_err(&device->dev, "Error registering device\n");
goto err;
}
result = acpi_device_setup_files(device);
if (result)
printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
dev_name(&device->dev));
return 0;
err:
mutex_lock(&acpi_device_lock);
if (device->parent)
list_del(&device->node);
list_del(&device->wakeup_list);
mutex_unlock(&acpi_device_lock);
err_detach:
acpi_detach_data(device->handle, acpi_scan_drop_device);
return result;
}
/* --------------------------------------------------------------------------
Driver Management
-------------------------------------------------------------------------- */
/**
* 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 ACPI 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
-------------------------------------------------------------------------- */
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
struct acpi_device *device = NULL;
acpi_status status;
/*
* 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)
return acpi_root;
do {
status = acpi_get_parent(handle, &handle);
if (ACPI_FAILURE(status))
return status == AE_NULL_ENTRY ? NULL : acpi_root;
} while (acpi_bus_get_device(handle, &device));
return device;
}
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(ACPI_ROOT_OBJECT, obj->string.pointer,
ejd);
kfree(buffer.pointer);
}
return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
struct acpi_device_wakeup *wakeup)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *package = NULL;
union acpi_object *element = NULL;
acpi_status status;
int err = -ENODATA;
if (!wakeup)
return -EINVAL;
INIT_LIST_HEAD(&wakeup->resources);
/* _PRW */
status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
return err;
}
package = (union acpi_object *)buffer.pointer;
if (!package || package->package.count < 2)
goto out;
element = &(package->package.elements[0]);
if (!element)
goto out;
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))
goto out;
wakeup->gpe_device =
element->package.elements[0].reference.handle;
wakeup->gpe_number =
(u32) element->package.elements[1].integer.value;
} else if (element->type == ACPI_TYPE_INTEGER) {
wakeup->gpe_device = NULL;
wakeup->gpe_number = element->integer.value;
} else {
goto out;
}
element = &(package->package.elements[1]);
if (element->type != ACPI_TYPE_INTEGER)
goto out;
wakeup->sleep_state = element->integer.value;
err = acpi_extract_power_resources(package, 2, &wakeup->resources);
if (err)
goto out;
if (!list_empty(&wakeup->resources)) {
int sleep_state;
err = acpi_power_wakeup_list_init(&wakeup->resources,
&sleep_state);
if (err) {
acpi_handle_warn(handle, "Retrieving current states "
"of wakeup power resources failed\n");
acpi_power_resources_list_free(&wakeup->resources);
goto out;
}
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;
}
}
out:
kfree(buffer.pointer);
return err;
}
static void acpi_wakeup_gpe_init(struct acpi_device *device)
{
struct acpi_device_id button_device_ids[] = {
{"PNP0C0C", 0},
{"PNP0C0D", 0},
{"PNP0C0E", 0},
{"", 0},
};
struct acpi_device_wakeup *wakeup = &device->wakeup;
acpi_status status;
acpi_event_status event_status;
wakeup->flags.notifier_present = 0;
/* Power button, Lid switch always enable wakeup */
if (!acpi_match_device_ids(device, button_device_ids)) {
wakeup->flags.run_wake = 1;
if (!acpi_match_device_ids(device, &button_device_ids[1])) {
/* Do not use Lid/sleep button for S5 wakeup */
if (wakeup->sleep_state == ACPI_STATE_S5)
wakeup->sleep_state = ACPI_STATE_S4;
}
acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
device_set_wakeup_capable(&device->dev, true);
return;
}
acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
wakeup->gpe_number);
status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
&event_status);
if (ACPI_FAILURE(status))
return;
wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HANDLE);
}
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
{
int err;
/* Presence of _PRW indicates wake capable */
if (!acpi_has_method(device->handle, "_PRW"))
return;
err = acpi_bus_extract_wakeup_device_power_package(device->handle,
&device->wakeup);
if (err) {
dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
return;
}
device->wakeup.flags.valid = 1;
device->wakeup.prepare_count = 0;
acpi_wakeup_gpe_init(device);
/* 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.
*/
err = acpi_device_sleep_wake(device, 0, 0, 0);
if (err)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"error in _DSW or _PSW evaluation\n"));
}
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
struct acpi_device_power_state *ps = &device->power.states[state];
char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
INIT_LIST_HEAD(&ps->resources);
/* 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) {
int err = acpi_extract_power_resources(package, 0,
&ps->resources);
if (!err)
device->power.flags.power_resources = 1;
}
ACPI_FREE(buffer.pointer);
}
/* Evaluate "_PSx" to see if we can do explicit sets */
pathname[2] = 'S';
if (acpi_has_method(device->handle, pathname))
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.
*/
if (!list_empty(&ps->resources)
|| (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 */
}
static void acpi_bus_get_power_flags(struct acpi_device *device)
{
u32 i;
/* Presence of _PS0|_PR0 indicates 'power manageable' */
if (!acpi_has_method(device->handle, "_PS0") &&
!acpi_has_method(device->handle, "_PR0"))
return;
device->flags.power_manageable = 1;
/*
* Power Management Flags
*/
if (acpi_has_method(device->handle, "_PSC"))
device->power.flags.explicit_get = 1;
if (acpi_has_method(device->handle, "_IRC"))
device->power.flags.inrush_current = 1;
if (acpi_has_method(device->handle, "_DSW"))
device->power.flags.dsw_present = 1;
/*
* Enumerate supported power management states
*/
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
acpi_bus_init_power_state(device, i);
INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
/* 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_COLD].flags.valid = 1;
device->power.states[ACPI_STATE_D3_COLD].power = 0;
/* 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;
/* 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;
if (acpi_bus_init_power(device)) {
acpi_free_power_resources_lists(device);
device->flags.power_manageable = 0;
}
}
static void acpi_bus_get_flags(struct acpi_device *device)
{
/* Presence of _STA indicates 'dynamic_status' */
if (acpi_has_method(device->handle, "_STA"))
device->flags.dynamic_status = 1;
/* Presence of _RMV indicates 'removable' */
if (acpi_has_method(device->handle, "_RMV"))
device->flags.removable = 1;
/* Presence of _EJD|_EJ0 indicates 'ejectable' */
if (acpi_has_method(device->handle, "_EJD") ||
acpi_has_method(device->handle, "_EJ0"))
device->flags.ejectable = 1;
}
static void acpi_device_get_busid(struct acpi_device *device)
{
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)?
*/
if (ACPI_IS_ROOT_DEVICE(device)) {
strcpy(device->pnp.bus_id, "ACPI");
return;
}
switch (device->device_type) {
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(device->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;
}
}
/*
* acpi_ata_match - see if an acpi object is an ATA device
*
* If an acpi object has one of the ACPI ATA methods defined,
* then we can safely call it an ATA device.
*/
bool acpi_ata_match(acpi_handle handle)
{
return acpi_has_method(handle, "_GTF") ||
acpi_has_method(handle, "_GTM") ||
acpi_has_method(handle, "_STM") ||
acpi_has_method(handle, "_SDD");
}
/*
* acpi_bay_match - see if an acpi object 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
*/
bool acpi_bay_match(acpi_handle handle)
{
acpi_handle phandle;
if (!acpi_has_method(handle, "_EJ0"))
return false;
if (acpi_ata_match(handle))
return true;
if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
return false;
return acpi_ata_match(phandle);
}
bool acpi_device_is_battery(struct acpi_device *adev)
{
struct acpi_hardware_id *hwid;
list_for_each_entry(hwid, &adev->pnp.ids, list)
if (!strcmp("PNP0C0A", hwid->id))
return true;
return false;
}
static bool is_ejectable_bay(struct acpi_device *adev)
{
acpi_handle handle = adev->handle;
if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
return true;
return acpi_bay_match(handle);
}
/*
* acpi_dock_match - see if an acpi object has a _DCK method
*/
bool acpi_dock_match(acpi_handle handle)
{
return acpi_has_method(handle, "_DCK");
}
const char *acpi_device_hid(struct acpi_device *device)
{
struct acpi_hardware_id *hid;
if (list_empty(&device->pnp.ids))
return dummy_hid;
hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
{
struct acpi_hardware_id *id;
id = kmalloc(sizeof(*id), GFP_KERNEL);
if (!id)
return;
id->id = kstrdup(dev_id, GFP_KERNEL);
if (!id->id) {
kfree(id);
return;
}
list_add_tail(&id->list, &pnp->ids);
pnp->type.hardware_id = 1;
}
/*
* 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 bool acpi_ibm_smbus_match(acpi_handle handle)
{
char node_name[ACPI_PATH_SEGMENT_LENGTH];
struct acpi_buffer path = { sizeof(node_name), node_name };
if (!dmi_name_in_vendors("IBM"))
return false;
/* Look for SMBS object */
if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
strcmp("SMBS", path.pointer))
return false;
/* Does it have the necessary (but misnamed) methods? */
if (acpi_has_method(handle, "SBI") &&
acpi_has_method(handle, "SBR") &&
acpi_has_method(handle, "SBW"))
return true;
return false;
}
static bool acpi_object_is_system_bus(acpi_handle handle)
{
acpi_handle tmp;
if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
tmp == handle)
return true;
if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
tmp == handle)
return true;
return false;
}
static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
int device_type)
{
acpi_status status;
struct acpi_device_info *info;
struct acpi_pnp_device_id_list *cid_list;
int i;
switch (device_type) {
case ACPI_BUS_TYPE_DEVICE:
if (handle == ACPI_ROOT_OBJECT) {
acpi_add_id(pnp, ACPI_SYSTEM_HID);
break;
}
status = acpi_get_object_info(handle, &info);
if (ACPI_FAILURE(status)) {
pr_err(PREFIX "%s: Error reading device info\n",
__func__);
return;
}
if (info->valid & ACPI_VALID_HID) {
acpi_add_id(pnp, info->hardware_id.string);
pnp->type.platform_id = 1;
}
if (info->valid & ACPI_VALID_CID) {
cid_list = &info->compatible_id_list;
for (i = 0; i < cid_list->count; i++)
acpi_add_id(pnp, cid_list->ids[i].string);
}
if (info->valid & ACPI_VALID_ADR) {
pnp->bus_address = info->address;
pnp->type.bus_address = 1;
}
if (info->valid & ACPI_VALID_UID)
pnp->unique_id = kstrdup(info->unique_id.string,
GFP_KERNEL);
kfree(info);
/*
* Some devices don't reliably have _HIDs & _CIDs, so add
* synthetic HIDs to make sure drivers can find them.
*/
if (acpi_is_video_device(handle))
acpi_add_id(pnp, ACPI_VIDEO_HID);
else if (acpi_bay_match(handle))
acpi_add_id(pnp, ACPI_BAY_HID);
else if (acpi_dock_match(handle))
acpi_add_id(pnp, ACPI_DOCK_HID);
else if (acpi_ibm_smbus_match(handle))
acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
else if (list_empty(&pnp->ids) &&
acpi_object_is_system_bus(handle)) {
/* \_SB, \_TZ, LNXSYBUS */
acpi_add_id(pnp, ACPI_BUS_HID);
strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
strcpy(pnp->device_class, ACPI_BUS_CLASS);
}
break;
case ACPI_BUS_TYPE_POWER:
acpi_add_id(pnp, ACPI_POWER_HID);
break;
case ACPI_BUS_TYPE_PROCESSOR:
acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
break;
case ACPI_BUS_TYPE_THERMAL:
acpi_add_id(pnp, ACPI_THERMAL_HID);
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
break;
}
}
void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
{
struct acpi_hardware_id *id, *tmp;
list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
kfree(id->id);
kfree(id);
}
kfree(pnp->unique_id);
}
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
int type, unsigned long long sta)
{
INIT_LIST_HEAD(&device->pnp.ids);
device->device_type = type;
device->handle = handle;
device->parent = acpi_bus_get_parent(handle);
acpi_set_device_status(device, sta);
acpi_device_get_busid(device);
acpi_set_pnp_ids(handle, &device->pnp, type);
acpi_bus_get_flags(device);
device->flags.match_driver = false;
device->flags.initialized = true;
device->flags.visited = false;
device_initialize(&device->dev);
dev_set_uevent_suppress(&device->dev, true);
}
void acpi_device_add_finalize(struct acpi_device *device)
{
dev_set_uevent_suppress(&device->dev, false);
kobject_uevent(&device->dev.kobj, KOBJ_ADD);
}
static int acpi_add_single_object(struct acpi_device **child,
acpi_handle handle, int type,
unsigned long long sta)
{
int result;
struct acpi_device *device;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
if (!device) {
printk(KERN_ERR PREFIX "Memory allocation error\n");
return -ENOMEM;
}
acpi_init_device_object(device, handle, type, sta);
acpi_bus_get_power_flags(device);
acpi_bus_get_wakeup_device_flags(device);
result = acpi_device_add(device, acpi_device_release);
if (result) {
acpi_device_release(&device->dev);
return result;
}
acpi_power_add_remove_device(device, true);
acpi_device_add_finalize(device);
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;
}
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
unsigned long long *sta)
{
acpi_status status;
acpi_object_type acpi_type;
status = acpi_get_type(handle, &acpi_type);
if (ACPI_FAILURE(status))
return -ENODEV;
switch (acpi_type) {
case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
case ACPI_TYPE_DEVICE:
*type = ACPI_BUS_TYPE_DEVICE;
status = acpi_bus_get_status_handle(handle, sta);
if (ACPI_FAILURE(status))
return -ENODEV;
break;
case ACPI_TYPE_PROCESSOR:
*type = ACPI_BUS_TYPE_PROCESSOR;
status = acpi_bus_get_status_handle(handle, sta);
if (ACPI_FAILURE(status))
return -ENODEV;
break;
case ACPI_TYPE_THERMAL:
*type = ACPI_BUS_TYPE_THERMAL;
*sta = ACPI_STA_DEFAULT;
break;
case ACPI_TYPE_POWER:
*type = ACPI_BUS_TYPE_POWER;
*sta = ACPI_STA_DEFAULT;
break;
default:
return -ENODEV;
}
return 0;
}
bool acpi_device_is_present(struct acpi_device *adev)
{
if (adev->status.present || adev->status.functional)
return true;
adev->flags.initialized = false;
return false;
}
static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
char *idstr,
const struct acpi_device_id **matchid)
{
const struct acpi_device_id *devid;
if (handler->match)
return handler->match(idstr, matchid);
for (devid = handler->ids; devid->id[0]; devid++)
if (!strcmp((char *)devid->id, idstr)) {
if (matchid)
*matchid = devid;
return true;
}
return false;
}
static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
const struct acpi_device_id **matchid)
{
struct acpi_scan_handler *handler;
list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
if (acpi_scan_handler_matching(handler, idstr, matchid))
return handler;
return NULL;
}
void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
{
if (!!hotplug->enabled == !!val)
return;
mutex_lock(&acpi_scan_lock);
hotplug->enabled = val;
mutex_unlock(&acpi_scan_lock);
}
static void acpi_scan_init_hotplug(struct acpi_device *adev)
{
struct acpi_hardware_id *hwid;
if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
acpi_dock_add(adev);
return;
}
list_for_each_entry(hwid, &adev->pnp.ids, list) {
struct acpi_scan_handler *handler;
handler = acpi_scan_match_handler(hwid->id, NULL);
if (handler) {
adev->flags.hotplug_notify = true;
break;
}
}
}
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
void *not_used, void **return_value)
{
struct acpi_device *device = NULL;
int type;
unsigned long long sta;
int result;
acpi_bus_get_device(handle, &device);
if (device)
goto out;
result = acpi_bus_type_and_status(handle, &type, &sta);
if (result)
return AE_OK;
if (type == ACPI_BUS_TYPE_POWER) {
acpi_add_power_resource(handle);
return AE_OK;
}
acpi_add_single_object(&device, handle, type, sta);
if (!device)
return AE_CTRL_DEPTH;
acpi_scan_init_hotplug(device);
out:
if (!*return_value)
*return_value = device;
return AE_OK;
}
static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
{
bool *is_spi_i2c_slave_p = data;
if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
return 1;
/*
* devices that are connected to UART still need to be enumerated to
* platform bus
*/
if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
*is_spi_i2c_slave_p = true;
/* no need to do more checking */
return -1;
}
static void acpi_default_enumeration(struct acpi_device *device)
{
struct list_head resource_list;
bool is_spi_i2c_slave = false;
if (!device->pnp.type.platform_id || device->handler)
return;
/*
* Do not enemerate SPI/I2C slaves as they will be enuerated by their
* respective parents.
*/
INIT_LIST_HEAD(&resource_list);
acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
&is_spi_i2c_slave);
acpi_dev_free_resource_list(&resource_list);
if (!is_spi_i2c_slave)
acpi_create_platform_device(device);
}
static int acpi_scan_attach_handler(struct acpi_device *device)
{
struct acpi_hardware_id *hwid;
int ret = 0;
list_for_each_entry(hwid, &device->pnp.ids, list) {
const struct acpi_device_id *devid;
struct acpi_scan_handler *handler;
handler = acpi_scan_match_handler(hwid->id, &devid);
if (handler) {
if (!handler->attach) {
device->pnp.type.platform_id = 0;
continue;
}
device->handler = handler;
ret = handler->attach(device, devid);
if (ret > 0)
break;
device->handler = NULL;
if (ret < 0)
break;
}
}
if (!ret)
acpi_default_enumeration(device);
return ret;
}
static void acpi_bus_attach(struct acpi_device *device)
{
struct acpi_device *child;
acpi_handle ejd;
int ret;
if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
register_dock_dependent_device(device, ejd);
acpi_bus_get_status(device);
/* Skip devices that are not present. */
if (!acpi_device_is_present(device)) {
device->flags.visited = false;
return;
}
if (device->handler)
goto ok;
if (!device->flags.initialized) {
acpi_bus_update_power(device, NULL);
device->flags.initialized = true;
}
device->flags.visited = false;
ret = acpi_scan_attach_handler(device);
if (ret < 0)
return;
device->flags.match_driver = true;
if (!ret) {
ret = device_attach(&device->dev);
if (ret < 0)
return;
}
device->flags.visited = true;
ok:
list_for_each_entry(child, &device->children, node)
acpi_bus_attach(child);
}
/**
* acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
* @handle: Root of the namespace scope to scan.
*
* Scan a given ACPI tree (probably recently hot-plugged) and create and add
* found devices.
*
* 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.
*
* Must be called under acpi_scan_lock.
*/
int acpi_bus_scan(acpi_handle handle)
{
void *device = NULL;
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);
if (device) {
acpi_bus_attach(device);
return 0;
}
return -ENODEV;
}
EXPORT_SYMBOL(acpi_bus_scan);
/**
* acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
* @adev: Root of the ACPI namespace scope to walk.
*
* Must be called under acpi_scan_lock.
*/
void acpi_bus_trim(struct acpi_device *adev)
{
struct acpi_scan_handler *handler = adev->handler;
struct acpi_device *child;
list_for_each_entry_reverse(child, &adev->children, node)
acpi_bus_trim(child);
adev->flags.match_driver = false;
if (handler) {
if (handler->detach)
handler->detach(adev);
adev->handler = NULL;
} else {
device_release_driver(&adev->dev);
}
/*
* Most likely, the device is going away, so put it into D3cold before
* that.
*/
acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
adev->flags.initialized = false;
adev->flags.visited = false;
}
EXPORT_SYMBOL_GPL(acpi_bus_trim);
static int acpi_bus_scan_fixed(void)
{
int result = 0;
/*
* Enumerate all fixed-feature devices.
*/
if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
struct acpi_device *device = NULL;
result = acpi_add_single_object(&device, NULL,
ACPI_BUS_TYPE_POWER_BUTTON,
ACPI_STA_DEFAULT);
if (result)
return result;
device->flags.match_driver = true;
result = device_attach(&device->dev);
if (result < 0)
return result;
device_init_wakeup(&device->dev, true);
}
if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
struct acpi_device *device = NULL;
result = acpi_add_single_object(&device, NULL,
ACPI_BUS_TYPE_SLEEP_BUTTON,
ACPI_STA_DEFAULT);
if (result)
return result;
device->flags.match_driver = true;
result = device_attach(&device->dev);
}
return result < 0 ? result : 0;
}
int __init acpi_scan_init(void)
{
int result;
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");
}
acpi_pci_root_init();
acpi_pci_link_init();
acpi_processor_init();
acpi_lpss_init();
acpi_cmos_rtc_init();
acpi_container_init();
acpi_memory_hotplug_init();
acpi_pnp_init();
mutex_lock(&acpi_scan_lock);
/*
* Enumerate devices in the ACPI namespace.
*/
result = acpi_bus_scan(ACPI_ROOT_OBJECT);
if (result)
goto out;
result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
if (result)
goto out;
/* Fixed feature devices do not exist on HW-reduced platform */
if (!acpi_gbl_reduced_hardware) {
result = acpi_bus_scan_fixed();
if (result) {
acpi_detach_data(acpi_root->handle,
acpi_scan_drop_device);
acpi_device_del(acpi_root);
put_device(&acpi_root->dev);
goto out;
}
}
acpi_update_all_gpes();
out:
mutex_unlock(&acpi_scan_lock);
return result;
}
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