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Commit e9a39153 authored by Patrick Mochel's avatar Patrick Mochel
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ACPI: Move all namespace scanning functions from drivers/acpi/bus.c to drivers/acpi/scan.c 

Also, trigger bus scanning in acpi_scan_init(), which is made into an initcall.
parent c6816db6
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Showing with 1128 additions and 1119 deletions
drivers/acpi/Makefile
View file @ e9a39153
...@@ -32,7 +32,7 @@ obj-$(CONFIG_ACPI_INTERPRETER) += osl.o utils.o \ ...@@ -32,7 +32,7 @@ obj-$(CONFIG_ACPI_INTERPRETER) += osl.o utils.o \
# #
# ACPI Bus and Device Drivers # ACPI Bus and Device Drivers
# #
obj-$(CONFIG_ACPI_BUS) += bus.o obj-$(CONFIG_ACPI_BUS) += bus.o scan.o
obj-$(CONFIG_ACPI_AC) += ac.o obj-$(CONFIG_ACPI_AC) += ac.o
obj-$(CONFIG_ACPI_BATTERY) += battery.o obj-$(CONFIG_ACPI_BATTERY) += battery.o
obj-$(CONFIG_ACPI_BUTTON) += button.o obj-$(CONFIG_ACPI_BUTTON) += button.o
......
drivers/acpi/acpi_bus.h
View file @ e9a39153
...@@ -292,7 +292,6 @@ int acpi_bus_generate_event (struct acpi_device *device, u8 type, int data); ...@@ -292,7 +292,6 @@ int acpi_bus_generate_event (struct acpi_device *device, u8 type, int data);
int acpi_bus_receive_event (struct acpi_bus_event *event); int acpi_bus_receive_event (struct acpi_bus_event *event);
int acpi_bus_register_driver (struct acpi_driver *driver); int acpi_bus_register_driver (struct acpi_driver *driver);
int acpi_bus_unregister_driver (struct acpi_driver *driver); int acpi_bus_unregister_driver (struct acpi_driver *driver);
int acpi_bus_scan (struct acpi_device *device);
#endif /*CONFIG_ACPI_BUS*/ #endif /*CONFIG_ACPI_BUS*/
......
drivers/acpi/acpi_ksyms.c
View file @ e9a39153
...@@ -124,6 +124,5 @@ EXPORT_SYMBOL(acpi_bus_generate_event); ...@@ -124,6 +124,5 @@ EXPORT_SYMBOL(acpi_bus_generate_event);
EXPORT_SYMBOL(acpi_bus_receive_event); EXPORT_SYMBOL(acpi_bus_receive_event);
EXPORT_SYMBOL(acpi_bus_register_driver); EXPORT_SYMBOL(acpi_bus_register_driver);
EXPORT_SYMBOL(acpi_bus_unregister_driver); EXPORT_SYMBOL(acpi_bus_unregister_driver);
EXPORT_SYMBOL(acpi_bus_scan);
#endif /*CONFIG_ACPI_BUS*/ #endif /*CONFIG_ACPI_BUS*/
drivers/acpi/bus.c
View file @ e9a39153
...@@ -22,11 +22,7 @@ ...@@ -22,11 +22,7 @@
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/ */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/types.h>
#include <linux/version.h>
#include <linux/ioport.h> #include <linux/ioport.h>
#include <linux/list.h> #include <linux/list.h>
#include <linux/sched.h> #include <linux/sched.h>
...@@ -37,16 +33,11 @@ ...@@ -37,16 +33,11 @@
#endif #endif
#include "acpi_bus.h" #include "acpi_bus.h"
#include "acpi_drivers.h" #include "acpi_drivers.h"
#include "include/acinterp.h" /* for acpi_ex_eisa_id_to_string() */
#define _COMPONENT ACPI_BUS_COMPONENT #define _COMPONENT ACPI_BUS_COMPONENT
ACPI_MODULE_NAME ("acpi_bus") ACPI_MODULE_NAME ("acpi_bus")
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION(ACPI_BUS_DRIVER_NAME);
MODULE_LICENSE("GPL");
extern void eisa_set_level_irq(unsigned int irq); extern void eisa_set_level_irq(unsigned int irq);
FADT_DESCRIPTOR acpi_fadt; FADT_DESCRIPTOR acpi_fadt;
...@@ -56,66 +47,14 @@ struct proc_dir_entry *acpi_root_dir; ...@@ -56,66 +47,14 @@ struct proc_dir_entry *acpi_root_dir;
#define STRUCT_TO_INT(s) (*((int*)&s)) #define STRUCT_TO_INT(s) (*((int*)&s))
/* --------------------------------------------------------------------------
Linux Driver Model (LDM) Support
-------------------------------------------------------------------------- */
static int
acpi_device_register (
struct acpi_device *device,
struct acpi_device *parent)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_device_register");
if (!device)
return_VALUE(-EINVAL);
sprintf(device->dev.name, "ACPI device %s:%s",
device->pnp.hardware_id, device->pnp.unique_id);
strncpy(device->dev.bus_id, device->pnp.bus_id, sizeof(acpi_bus_id));
if (parent)
device->dev.parent = &parent->dev;
result = device_register(&device->dev);
return_VALUE(result);
}
static int
acpi_device_unregister (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_device_unregister");
if (device)
put_device(&device->dev);
return_VALUE(0);
}
/* -------------------------------------------------------------------------- /* --------------------------------------------------------------------------
Device Management Device Management
-------------------------------------------------------------------------- */ -------------------------------------------------------------------------- */
static void extern void acpi_bus_data_handler (
acpi_bus_data_handler (
acpi_handle handle, acpi_handle handle,
u32 function, u32 function,
void *context) void *context);
{
ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
/* TBD */
return_VOID;
}
int int
acpi_bus_get_device ( acpi_bus_get_device (
acpi_handle handle, acpi_handle handle,
...@@ -323,110 +262,6 @@ acpi_bus_set_power ( ...@@ -323,110 +262,6 @@ acpi_bus_set_power (
} }
static int
acpi_bus_get_power_flags (
struct acpi_device *device)
{
acpi_status status = 0;
acpi_handle handle = 0;
u32 i = 0;
ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
if (!device)
return -ENODEV;
/*
* 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;
status = acpi_get_handle(device->handle, "_PRW", &handle);
if (ACPI_SUCCESS(status))
device->power.flags.wake_capable = 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;
/*
* System Power States
* -------------------
*/
/* TBD: S1-S4 power state support and resource requirements. */
/*
for (i=ACPI_STATE_S1; i<ACPI_STATE_S5; i++) {
char name[5] = {'_','S',('0'+i),'D','\0'};
status = acpi_evaluate_integer(device->handle, name, NULL,
&state);
if (ACPI_FAILURE(status))
continue;
}
*/
/* TBD: System wake support and resource requirements. */
device->power.state = ACPI_STATE_UNKNOWN;
return 0;
}
/* --------------------------------------------------------------------------
Performance Management
-------------------------------------------------------------------------- */
static int
acpi_bus_get_perf_flags (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_bus_get_perf_flags");
if (!device)
return -ENODEV;
device->performance.state = ACPI_STATE_UNKNOWN;
return 0;
}
/* -------------------------------------------------------------------------- /* --------------------------------------------------------------------------
Event Management Event Management
...@@ -521,100 +356,6 @@ acpi_bus_receive_event ( ...@@ -521,100 +356,6 @@ acpi_bus_receive_event (
} }
/* --------------------------------------------------------------------------
Namespace Management
-------------------------------------------------------------------------- */
#define WALK_UP 0
#define WALK_DOWN 1
typedef int (*acpi_bus_walk_callback)(struct acpi_device*, int, void*);
#define HAS_CHILDREN(d) ((d)->children.next != &((d)->children))
#define HAS_SIBLINGS(d) (((d)->parent) && ((d)->node.next != &(d)->parent->children))
#define NODE_TO_DEVICE(n) (list_entry(n, struct acpi_device, node))
/**
* acpi_bus_walk
* -------------
* Used to walk the ACPI Bus's device namespace. Can walk down (depth-first)
* or up. Able to parse starting at any node in the namespace. Note that a
* callback return value of -ELOOP will terminate the walk.
*
* @start: starting point
* callback: function to call for every device encountered while parsing
* direction: direction to parse (up or down)
* @data: context for this search operation
*/
static int
acpi_bus_walk (
struct acpi_device *start,
acpi_bus_walk_callback callback,
int direction,
void *data)
{
int result = 0;
int level = 0;
struct acpi_device *device = NULL;
if (!start || !callback)
return -EINVAL;
device = start;
/*
* Parse Namespace
* ---------------
* Parse a given subtree (specified by start) in the given direction.
* Walking 'up' simply means that we execute the callback on leaf
* devices prior to their parents (useful for things like removing
* or powering down a subtree).
*/
while (device) {
if (direction == WALK_DOWN)
if (-ELOOP == callback(device, level, data))
break;
/* Depth First */
if (HAS_CHILDREN(device)) {
device = NODE_TO_DEVICE(device->children.next);
++level;
continue;
}
if (direction == WALK_UP)
if (-ELOOP == callback(device, level, data))
break;
/* Now Breadth */
if (HAS_SIBLINGS(device)) {
device = NODE_TO_DEVICE(device->node.next);
continue;
}
/* Scope Exhausted - Find Next */
while ((device = device->parent)) {
--level;
if (HAS_SIBLINGS(device)) {
device = NODE_TO_DEVICE(device->node.next);
break;
}
}
}
if ((direction == WALK_UP) && (result == 0))
callback(start, level, data);
return result;
}
/* -------------------------------------------------------------------------- /* --------------------------------------------------------------------------
Notification Handling Notification Handling
-------------------------------------------------------------------------- */ -------------------------------------------------------------------------- */
...@@ -791,958 +532,125 @@ acpi_bus_notify ( ...@@ -791,958 +532,125 @@ acpi_bus_notify (
return_VOID; return_VOID;
} }
/* -------------------------------------------------------------------------- /* --------------------------------------------------------------------------
Driver Management Initialization/Cleanup
-------------------------------------------------------------------------- */ -------------------------------------------------------------------------- */
static LIST_HEAD(acpi_bus_drivers); static int __init
static DECLARE_MUTEX(acpi_bus_drivers_lock); acpi_bus_init_irq (void)
/**
* acpi_bus_match
* --------------
* Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
* matches the specified driver's criteria.
*/
static int
acpi_bus_match (
struct acpi_device *device,
struct acpi_driver *driver)
{ {
if (!device || !driver)
return -EINVAL;
if (device->flags.hardware_id) {
if (strstr(driver->ids, device->pnp.hardware_id))
return 0;
}
if (device->flags.compatible_ids) {
acpi_status status = AE_OK; acpi_status status = AE_OK;
acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; acpi_object arg = {ACPI_TYPE_INTEGER};
acpi_object *object = NULL; acpi_object_list arg_list = {1, &arg};
char cid[256]; char *message = NULL;
memset(cid, 0, sizeof(cid));
status = acpi_evaluate_object(device->handle, "_CID", NULL, ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
&buffer);
if (ACPI_FAILURE(status) || !buffer.pointer)
return -ENOENT;
object = (acpi_object *) buffer.pointer; /*
* Let the system know what interrupt model we are using by
* evaluating the \_PIC object, if exists.
*/
switch (object->type) { switch (acpi_irq_model) {
case ACPI_TYPE_INTEGER: case ACPI_IRQ_MODEL_PIC:
acpi_ex_eisa_id_to_string((u32) object->integer.value, message = "PIC";
cid);
break; break;
case ACPI_TYPE_STRING: case ACPI_IRQ_MODEL_IOAPIC:
strncpy(cid, object->string.pointer, sizeof(cid) - 1); message = "IOAPIC";
break; break;
case ACPI_TYPE_PACKAGE: case ACPI_IRQ_MODEL_IOSAPIC:
/* TBD: Support CID packages */ message = "IOSAPIC";
break; break;
default:
printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
return_VALUE(-ENODEV);
} }
if (!cid[0]) { printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
acpi_os_free(buffer.pointer);
return -ENOENT;
}
if (strstr(driver->ids, cid)) { arg.integer.value = acpi_irq_model;
acpi_os_free(buffer.pointer);
return 0;
}
acpi_os_free(buffer.pointer); status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
return_VALUE(-ENODEV);
} }
return -ENOENT; return_VALUE(0);
} }
/** static int __init
* acpi_bus_driver_init acpi_bus_init (void)
* --------------------
* Used to initialize a device via its device driver. Called whenever a
* driver is bound to a device. Invokes the driver's add() and start() ops.
*/
static int
acpi_bus_driver_init (
struct acpi_device *device,
struct acpi_driver *driver)
{ {
int result = 0; int result = 0;
acpi_status status = AE_OK;
acpi_buffer buffer = {sizeof(acpi_fadt), &acpi_fadt};
ACPI_FUNCTION_TRACE("acpi_bus_driver_init"); ACPI_FUNCTION_TRACE("acpi_bus_init");
if (!device || !driver)
return_VALUE(-EINVAL);
if (!driver->ops.add) status = acpi_initialize_subsystem();
return_VALUE(-ENOSYS); if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n");
goto error0;
}
result = driver->ops.add(device); status = acpi_load_tables();
if (result) { if (ACPI_FAILURE(status)) {
device->driver = NULL; printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n");
acpi_driver_data(device) = NULL; goto error0;
return_VALUE(result);
} }
/* /*
* TBD - Configuration Management: Assign resources to device based * Get a separate copy of the FADT for use by other drivers.
* upon possible configuration and currently allocated resources.
*/ */
status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
if (driver->ops.start) { if (ACPI_FAILURE(status)) {
result = driver->ops.start(device); printk(KERN_ERR PREFIX "Unable to get the FADT\n");
if (result && driver->ops.remove) goto error1;
driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
return_VALUE(result);
} }
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver successfully bound to device\n")); #ifdef CONFIG_X86
/* Ensure the SCI is set to level-triggered, active-low */
if (acpi_ioapic)
mp_override_legacy_irq(acpi_fadt.sci_int, 3, 3, acpi_fadt.sci_int);
else
eisa_set_level_irq(acpi_fadt.sci_int);
#endif
status = acpi_enable_subsystem(ACPI_FULL_INITIALIZATION);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n");
goto error1;
}
#ifdef CONFIG_LDM #ifdef CONFIG_ACPI_EC
/* /*
* Update the device information (in the global device hierarchy) now * ACPI 2.0 requires the EC driver to be loaded and work before
* that there's a driver bound to it. * the EC device is found in the namespace. This is accomplished
* by looking for the ECDT table, and getting the EC parameters out
* of that.
*/ */
strncpy(device->dev.name, device->pnp.device_name, result = acpi_ec_ecdt_probe();
sizeof(device->dev.name)); if (result) {
goto error1;
}
#endif #endif
if (driver->ops.scan) { status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
driver->ops.scan(device); if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
goto error1;
} }
return_VALUE(0); printk(KERN_INFO PREFIX "Interpreter enabled\n");
}
/** /*
* acpi_bus_attach * Get the system interrupt model and evaluate \_PIC.
* -------------
* Callback for acpi_bus_walk() used to find devices that match a specific
* driver's criteria and then attach the driver.
*/ */
static int result = acpi_bus_init_irq();
acpi_bus_attach (
struct acpi_device *device,
int level,
void *data)
{
int result = 0;
struct acpi_driver *driver = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_attach");
if (!device || !data)
return_VALUE(-EINVAL);
driver = (struct acpi_driver *) data;
if (device->driver)
return_VALUE(-EEXIST);
if (!device->status.present)
return_VALUE(-ENODEV);
result = acpi_bus_match(device, driver);
if (result)
return_VALUE(result);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
driver->name, device->pnp.bus_id));
result = acpi_bus_driver_init(device, driver);
if (result) if (result)
return_VALUE(result); goto error1;
down(&acpi_bus_drivers_lock);
++driver->references;
up(&acpi_bus_drivers_lock);
return_VALUE(0);
}
/**
* acpi_bus_unattach
* -----------------
* Callback for acpi_bus_walk() used to find devices that match a specific
* driver's criteria and unattach the driver.
*/
static int
acpi_bus_unattach (
struct acpi_device *device,
int level,
void *data)
{
int result = 0;
struct acpi_driver *driver = (struct acpi_driver *) data;
ACPI_FUNCTION_TRACE("acpi_bus_unattach");
if (!device || !driver)
return_VALUE(-EINVAL);
if (device->driver != driver)
return_VALUE(-ENOENT);
if (!driver->ops.remove)
return_VALUE(-ENOSYS);
result = driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
if (result)
return_VALUE(result);
device->driver = NULL;
acpi_driver_data(device) = NULL;
down(&acpi_bus_drivers_lock);
driver->references--;
up(&acpi_bus_drivers_lock);
return_VALUE(0);
}
/**
* acpi_bus_find_driver
* --------------------
* Parses the list of registered drivers looking for a driver applicable for
* the specified device.
*/
static int
acpi_bus_find_driver (
struct acpi_device *device)
{
int result = -ENODEV;
struct list_head *entry = NULL;
struct acpi_driver *driver = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
if (!device || device->driver)
return_VALUE(-EINVAL);
down(&acpi_bus_drivers_lock);
list_for_each(entry, &acpi_bus_drivers) {
driver = list_entry(entry, struct acpi_driver, node);
if (acpi_bus_match(device, driver))
continue;
result = acpi_bus_driver_init(device, driver);
if (!result)
++driver->references;
break;
}
up(&acpi_bus_drivers_lock);
return_VALUE(result);
}
/**
* acpi_bus_register_driver
* ------------------------
* Registers a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and binds.
*/
int
acpi_bus_register_driver (
struct acpi_driver *driver)
{
ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
if (!driver)
return_VALUE(-EINVAL);
down(&acpi_bus_drivers_lock);
list_add_tail(&driver->node, &acpi_bus_drivers);
up(&acpi_bus_drivers_lock);
acpi_bus_walk(acpi_root, acpi_bus_attach,
WALK_DOWN, driver);
return_VALUE(driver->references);
}
/**
* acpi_bus_unregister_driver
* --------------------------
* Unregisters a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and unbinds.
*/
int
acpi_bus_unregister_driver (
struct acpi_driver *driver)
{
ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
if (!driver)
return_VALUE(-EINVAL);
acpi_bus_walk(acpi_root, acpi_bus_unattach, WALK_UP, driver);
if (driver->references)
return_VALUE(driver->references);
down(&acpi_bus_drivers_lock);
list_del(&driver->node);
up(&acpi_bus_drivers_lock);
return_VALUE(0);
}
/* --------------------------------------------------------------------------
Device Enumeration
-------------------------------------------------------------------------- */
static int
acpi_bus_get_flags (
struct acpi_device *device)
{
acpi_status status = AE_OK;
acpi_handle temp = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
/* Presence of _STA indicates 'dynamic_status' */
status = acpi_get_handle(device->handle, "_STA", &temp);
if (ACPI_SUCCESS(status))
device->flags.dynamic_status = 1;
/* Presence of _CID indicates 'compatible_ids' */
status = acpi_get_handle(device->handle, "_CID", &temp);
if (ACPI_SUCCESS(status))
device->flags.compatible_ids = 1;
/* Presence of _RMV indicates 'removable' */
status = acpi_get_handle(device->handle, "_RMV", &temp);
if (ACPI_SUCCESS(status))
device->flags.removable = 1;
/* Presence of _EJD|_EJ0 indicates 'ejectable' */
status = acpi_get_handle(device->handle, "_EJD", &temp);
if (ACPI_SUCCESS(status))
device->flags.ejectable = 1;
else {
status = acpi_get_handle(device->handle, "_EJ0", &temp);
if (ACPI_SUCCESS(status))
device->flags.ejectable = 1;
}
/* Presence of _LCK indicates 'lockable' */
status = acpi_get_handle(device->handle, "_LCK", &temp);
if (ACPI_SUCCESS(status))
device->flags.lockable = 1;
/* Presence of _PS0|_PR0 indicates 'power manageable' */
status = acpi_get_handle(device->handle, "_PS0", &temp);
if (ACPI_FAILURE(status))
status = acpi_get_handle(device->handle, "_PR0", &temp);
if (ACPI_SUCCESS(status))
device->flags.power_manageable = 1;
/* TBD: Peformance management */
return_VALUE(0);
}
static int
acpi_bus_add (
struct acpi_device **child,
struct acpi_device *parent,
acpi_handle handle,
int type)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_device *device = NULL;
char bus_id[5] = {'?',0};
acpi_buffer buffer = {sizeof(bus_id), bus_id};
acpi_device_info info;
char *hid = NULL;
char *uid = NULL;
int i = 0;
ACPI_FUNCTION_TRACE("acpi_bus_add");
if (!child)
return_VALUE(-EINVAL);
device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
if (!device) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
return_VALUE(-ENOMEM);
}
memset(device, 0, sizeof(struct acpi_device));
device->handle = handle;
device->parent = parent;
memset(&info, 0, sizeof(acpi_device_info));
/*
* 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:
sprintf(device->pnp.bus_id, "%s", "ACPI");
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
sprintf(device->pnp.bus_id, "%s", "PWRF");
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
sprintf(device->pnp.bus_id, "%s", "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;
}
sprintf(device->pnp.bus_id, "%s", bus_id);
break;
}
/*
* 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()
* objects (e.g. thermal zones, power resources, processors, 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_DEVICE:
result = acpi_bus_get_status(device);
if (result)
goto end;
break;
default:
STRUCT_TO_INT(device->status) = 0x0F;
break;
}
if (!device->status.present) {
result = -ENOENT;
goto end;
}
/*
* Initialize Device
* -----------------
* TBD: Synch with Core's enumeration/initialization process.
*/
/*
* Hardware ID, Unique ID, & Bus Address
* -------------------------------------
*/
switch (type) {
case ACPI_BUS_TYPE_DEVICE:
status = acpi_get_object_info(handle, &info);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error reading device info\n"));
result = -ENODEV;
goto end;
}
/* Clean up info strings (not NULL terminated) */
info.hardware_id[sizeof(info.hardware_id)-1] = '\0';
info.unique_id[sizeof(info.unique_id)-1] = '\0';
if (info.valid & ACPI_VALID_HID)
hid = info.hardware_id;
if (info.valid & ACPI_VALID_UID)
uid = info.unique_id;
if (info.valid & ACPI_VALID_ADR) {
device->pnp.bus_address = info.address;
device->flags.bus_address = 1;
}
break;
case ACPI_BUS_TYPE_POWER:
hid = ACPI_POWER_HID;
break;
case ACPI_BUS_TYPE_PROCESSOR:
hid = ACPI_PROCESSOR_HID;
break;
case ACPI_BUS_TYPE_SYSTEM:
hid = ACPI_SYSTEM_HID;
break;
case ACPI_BUS_TYPE_THERMAL:
hid = ACPI_THERMAL_HID;
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
hid = ACPI_BUTTON_HID_POWERF;
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
hid = ACPI_BUTTON_HID_SLEEPF;
break;
}
/*
* \_SB
* ----
* Fix for the system root bus device -- the only root-level device.
*/
if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
hid = ACPI_BUS_HID;
sprintf(device->pnp.device_name, "%s", ACPI_BUS_DEVICE_NAME);
sprintf(device->pnp.device_class, "%s", ACPI_BUS_CLASS);
}
if (hid) {
sprintf(device->pnp.hardware_id, "%s", hid);
device->flags.hardware_id = 1;
}
if (uid) {
sprintf(device->pnp.unique_id, "%s", uid);
device->flags.unique_id = 1;
}
/*
* Power Management
* ----------------
*/
if (device->flags.power_manageable) {
result = acpi_bus_get_power_flags(device);
if (result)
goto end;
}
/*
* Performance Management
* ----------------------
*/
if (device->flags.performance_manageable) {
result = acpi_bus_get_perf_flags(device);
if (result)
goto end;
}
/*
* 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.
*/
switch (type) {
case ACPI_BUS_TYPE_POWER_BUTTON:
case ACPI_BUS_TYPE_SLEEP_BUTTON:
break;
default:
status = acpi_attach_data(device->handle,
acpi_bus_data_handler, device);
break;
}
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error attaching device data\n"));
result = -ENODEV;
goto end;
}
/*
* Linkage
* -------
* Link this device to its parent and siblings.
*/
INIT_LIST_HEAD(&device->children);
if (!device->parent)
INIT_LIST_HEAD(&device->node);
else
list_add_tail(&device->node, &device->parent->children);
#ifdef CONFIG_ACPI_DEBUG
{
char *type_string = NULL;
char name[80] = {'?','\0'};
acpi_buffer buffer = {sizeof(name), name};
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
switch (type) {
case ACPI_BUS_TYPE_DEVICE:
type_string = "Device";
break;
case ACPI_BUS_TYPE_POWER:
type_string = "Power Resource";
break;
case ACPI_BUS_TYPE_PROCESSOR:
type_string = "Processor";
break;
case ACPI_BUS_TYPE_SYSTEM:
type_string = "System";
break;
case ACPI_BUS_TYPE_THERMAL:
type_string = "Thermal Zone";
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
type_string = "Power Button";
sprintf(name, "PWRB");
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
type_string = "Sleep Button";
sprintf(name, "SLPB");
break;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s %s [%p]\n",
type_string, name, handle));
}
#endif /*CONFIG_ACPI_DEBUG*/
/*
* Global Device Hierarchy:
* ------------------------
* Register this device with the global device hierarchy.
*/
acpi_device_register(device, parent);
/*
* Bind _ADR-Based Devices
* -----------------------
* If there's a a bus address (_ADR) then we utilize the parent's
* 'bind' function (if exists) to bind the ACPI- and natively-
* enumerated device representations.
*/
if (device->flags.bus_address) {
if (device->parent && device->parent->ops.bind)
device->parent->ops.bind(device);
}
/*
* Locate & Attach Driver
* ----------------------
* If there's a hardware id (_HID) or compatible ids (_CID) we check
* to see if there's a driver installed for this kind of device. Note
* that drivers can install before or after a device in enumerated.
*
* TBD: Assumes LDM provides driver hot-plug capability.
*/
if (device->flags.hardware_id || device->flags.compatible_ids)
acpi_bus_find_driver(device);
end:
if (result) {
kfree(device);
return_VALUE(result);
}
*child = device;
return_VALUE(0);
}
static int
acpi_bus_remove (
struct acpi_device *device,
int type)
{
ACPI_FUNCTION_TRACE("acpi_bus_remove");
if (!device)
return_VALUE(-ENODEV);
acpi_device_unregister(device);
kfree(device);
return_VALUE(0);
}
int
acpi_bus_scan (
struct acpi_device *start)
{
acpi_status status = AE_OK;
struct acpi_device *parent = NULL;
struct acpi_device *child = NULL;
acpi_handle phandle = 0;
acpi_handle chandle = 0;
acpi_object_type type = 0;
u32 level = 1;
ACPI_FUNCTION_TRACE("acpi_bus_scan");
if (!start)
return_VALUE(-EINVAL);
parent = start;
phandle = start->handle;
/*
* Parse through the ACPI namespace, identify all 'devices', and
* create a new 'struct acpi_device' for each.
*/
while ((level > 0) && parent) {
status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
chandle, &chandle);
/*
* If this scope is exhausted then move our way back up.
*/
if (ACPI_FAILURE(status)) {
level--;
chandle = phandle;
acpi_get_parent(phandle, &phandle);
if (parent->parent)
parent = parent->parent;
continue;
}
status = acpi_get_type(chandle, &type);
if (ACPI_FAILURE(status))
continue;
/*
* If this is a scope object then parse it (depth-first).
*/
if (type == ACPI_TYPE_ANY) {
/* Hack to get around scope identity problem */
status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, 0, NULL);
if (ACPI_SUCCESS(status)) {
level++;
phandle = chandle;
chandle = 0;
}
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;
}
status = acpi_bus_add(&child, parent, chandle, type);
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,
0, NULL);
if (ACPI_SUCCESS(status)) {
level++;
phandle = chandle;
chandle = 0;
parent = child;
}
}
}
return_VALUE(0);
}
static int
acpi_bus_scan_fixed (
struct acpi_device *root)
{
int result = 0;
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
if (!root)
return_VALUE(-ENODEV);
/*
* Enumerate all fixed-feature devices.
*/
if (acpi_fadt.pwr_button == 0)
result = acpi_bus_add(&device, acpi_root,
ACPI_ROOT_OBJECT, ACPI_BUS_TYPE_POWER_BUTTON);
if (acpi_fadt.sleep_button == 0)
result = acpi_bus_add(&device, acpi_root,
ACPI_ROOT_OBJECT, ACPI_BUS_TYPE_SLEEP_BUTTON);
return_VALUE(result);
}
/* --------------------------------------------------------------------------
Initialization/Cleanup
-------------------------------------------------------------------------- */
static int __init
acpi_bus_init_irq (void)
{
acpi_status status = AE_OK;
acpi_object arg = {ACPI_TYPE_INTEGER};
acpi_object_list arg_list = {1, &arg};
char *message = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
/*
* Let the system know what interrupt model we are using by
* evaluating the \_PIC object, if exists.
*/
switch (acpi_irq_model) {
case ACPI_IRQ_MODEL_PIC:
message = "PIC";
break;
case ACPI_IRQ_MODEL_IOAPIC:
message = "IOAPIC";
break;
case ACPI_IRQ_MODEL_IOSAPIC:
message = "IOSAPIC";
break;
default:
printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
return_VALUE(-ENODEV);
}
printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
arg.integer.value = acpi_irq_model;
status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
return_VALUE(-ENODEV);
}
return_VALUE(0);
}
static int __init
acpi_bus_init (void)
{
int result = 0;
acpi_status status = AE_OK;
acpi_buffer buffer = {sizeof(acpi_fadt), &acpi_fadt};
ACPI_FUNCTION_TRACE("acpi_bus_init");
status = acpi_initialize_subsystem();
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n");
goto error0;
}
status = acpi_load_tables();
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n");
goto error0;
}
/*
* Get a separate copy of the FADT for use by other drivers.
*/
status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to get the FADT\n");
goto error1;
}
#ifdef CONFIG_X86
/* Ensure the SCI is set to level-triggered, active-low */
if (acpi_ioapic)
mp_override_legacy_irq(acpi_fadt.sci_int, 3, 3, acpi_fadt.sci_int);
else
eisa_set_level_irq(acpi_fadt.sci_int);
#endif
status = acpi_enable_subsystem(ACPI_FULL_INITIALIZATION);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n");
goto error1;
}
#ifdef CONFIG_ACPI_EC
/*
* ACPI 2.0 requires the EC driver to be loaded and work before
* the EC device is found in the namespace. This is accomplished
* by looking for the ECDT table, and getting the EC parameters out
* of that.
*/
result = acpi_ec_ecdt_probe();
if (result) {
goto error1;
}
#endif
status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
goto error1;
}
printk(KERN_INFO PREFIX "Interpreter enabled\n");
/*
* Get the system interrupt model and evaluate \_PIC.
*/
result = acpi_bus_init_irq();
if (result)
goto error1;
/* /*
* Register the for all standard device notifications. * Register the for all standard device notifications.
...@@ -1754,14 +662,6 @@ acpi_bus_init (void) ...@@ -1754,14 +662,6 @@ acpi_bus_init (void)
goto error1; goto error1;
} }
/*
* Create the root device in the bus's device tree
*/
result = acpi_bus_add(&acpi_root, NULL, ACPI_ROOT_OBJECT,
ACPI_BUS_TYPE_SYSTEM);
if (result)
goto error2;
/* /*
* Create the top ACPI proc directory * Create the top ACPI proc directory
*/ */
...@@ -1784,24 +684,10 @@ acpi_bus_init (void) ...@@ -1784,24 +684,10 @@ acpi_bus_init (void)
acpi_pci_link_init(); /* ACPI PCI Interrupt Link */ acpi_pci_link_init(); /* ACPI PCI Interrupt Link */
acpi_pci_root_init(); /* ACPI PCI Root Bridge */ acpi_pci_root_init(); /* ACPI PCI Root Bridge */
#endif #endif
/*
* Enumerate devices in the ACPI namespace.
*/
result = acpi_bus_scan_fixed(acpi_root);
if (result)
goto error4;
result = acpi_bus_scan(acpi_root);
if (result)
goto error4;
return_VALUE(0); return_VALUE(0);
/* Mimic structured exception handling */ /* Mimic structured exception handling */
error4:
remove_proc_entry(ACPI_BUS_FILE_ROOT, NULL);
error3: error3:
acpi_bus_remove(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
error2:
acpi_remove_notify_handler(ACPI_ROOT_OBJECT, acpi_remove_notify_handler(ACPI_ROOT_OBJECT,
ACPI_SYSTEM_NOTIFY, &acpi_bus_notify); ACPI_SYSTEM_NOTIFY, &acpi_bus_notify);
error1: error1:
......
drivers/acpi/scan.c 0 → 100644
View file @ e9a39153
/*
* scan.c - support for transforming the ACPI namespace into individual objects
*/
#include <linux/init.h>
#include <linux/acpi.h>
#include "acpi_drivers.h"
#include "include/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;
static int
acpi_device_register (
struct acpi_device *device,
struct acpi_device *parent)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_device_register");
if (!device)
return_VALUE(-EINVAL);
sprintf(device->dev.name, "ACPI device %s:%s",
device->pnp.hardware_id, device->pnp.unique_id);
strncpy(device->dev.bus_id, device->pnp.bus_id, sizeof(acpi_bus_id));
if (parent)
device->dev.parent = &parent->dev;
result = device_register(&device->dev);
return_VALUE(result);
}
static int
acpi_device_unregister (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_device_unregister");
if (device)
put_device(&device->dev);
return_VALUE(0);
}
void
acpi_bus_data_handler (
acpi_handle handle,
u32 function,
void *context)
{
ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
/* TBD */
return_VOID;
}
static int
acpi_bus_get_power_flags (
struct acpi_device *device)
{
acpi_status status = 0;
acpi_handle handle = 0;
u32 i = 0;
ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
if (!device)
return -ENODEV;
/*
* 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;
status = acpi_get_handle(device->handle, "_PRW", &handle);
if (ACPI_SUCCESS(status))
device->power.flags.wake_capable = 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;
/*
* System Power States
* -------------------
*/
/* TBD: S1-S4 power state support and resource requirements. */
/*
for (i=ACPI_STATE_S1; i<ACPI_STATE_S5; i++) {
char name[5] = {'_','S',('0'+i),'D','\0'};
status = acpi_evaluate_integer(device->handle, name, NULL,
&state);
if (ACPI_FAILURE(status))
continue;
}
*/
/* TBD: System wake support and resource requirements. */
device->power.state = ACPI_STATE_UNKNOWN;
return 0;
}
/* --------------------------------------------------------------------------
Performance Management
-------------------------------------------------------------------------- */
static int
acpi_bus_get_perf_flags (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_bus_get_perf_flags");
if (!device)
return -ENODEV;
device->performance.state = ACPI_STATE_UNKNOWN;
return 0;
}
/* --------------------------------------------------------------------------
Namespace Management
-------------------------------------------------------------------------- */
#define WALK_UP 0
#define WALK_DOWN 1
typedef int (*acpi_bus_walk_callback)(struct acpi_device*, int, void*);
#define HAS_CHILDREN(d) ((d)->children.next != &((d)->children))
#define HAS_SIBLINGS(d) (((d)->parent) && ((d)->node.next != &(d)->parent->children))
#define NODE_TO_DEVICE(n) (list_entry(n, struct acpi_device, node))
/**
* acpi_bus_walk
* -------------
* Used to walk the ACPI Bus's device namespace. Can walk down (depth-first)
* or up. Able to parse starting at any node in the namespace. Note that a
* callback return value of -ELOOP will terminate the walk.
*
* @start: starting point
* callback: function to call for every device encountered while parsing
* direction: direction to parse (up or down)
* @data: context for this search operation
*/
static int
acpi_bus_walk (
struct acpi_device *start,
acpi_bus_walk_callback callback,
int direction,
void *data)
{
int result = 0;
int level = 0;
struct acpi_device *device = NULL;
if (!start || !callback)
return -EINVAL;
device = start;
/*
* Parse Namespace
* ---------------
* Parse a given subtree (specified by start) in the given direction.
* Walking 'up' simply means that we execute the callback on leaf
* devices prior to their parents (useful for things like removing
* or powering down a subtree).
*/
while (device) {
if (direction == WALK_DOWN)
if (-ELOOP == callback(device, level, data))
break;
/* Depth First */
if (HAS_CHILDREN(device)) {
device = NODE_TO_DEVICE(device->children.next);
++level;
continue;
}
if (direction == WALK_UP)
if (-ELOOP == callback(device, level, data))
break;
/* Now Breadth */
if (HAS_SIBLINGS(device)) {
device = NODE_TO_DEVICE(device->node.next);
continue;
}
/* Scope Exhausted - Find Next */
while ((device = device->parent)) {
--level;
if (HAS_SIBLINGS(device)) {
device = NODE_TO_DEVICE(device->node.next);
break;
}
}
}
if ((direction == WALK_UP) && (result == 0))
callback(start, level, data);
return result;
}
/* --------------------------------------------------------------------------
Driver Management
-------------------------------------------------------------------------- */
static LIST_HEAD(acpi_bus_drivers);
static DECLARE_MUTEX(acpi_bus_drivers_lock);
/**
* acpi_bus_match
* --------------
* Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
* matches the specified driver's criteria.
*/
static int
acpi_bus_match (
struct acpi_device *device,
struct acpi_driver *driver)
{
if (!device || !driver)
return -EINVAL;
if (device->flags.hardware_id) {
if (strstr(driver->ids, device->pnp.hardware_id))
return 0;
}
if (device->flags.compatible_ids) {
acpi_status status = AE_OK;
acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
acpi_object *object = NULL;
char cid[256];
memset(cid, 0, sizeof(cid));
status = acpi_evaluate_object(device->handle, "_CID", NULL,
&buffer);
if (ACPI_FAILURE(status) || !buffer.pointer)
return -ENOENT;
object = (acpi_object *) buffer.pointer;
switch (object->type) {
case ACPI_TYPE_INTEGER:
acpi_ex_eisa_id_to_string((u32) object->integer.value,
cid);
break;
case ACPI_TYPE_STRING:
strncpy(cid, object->string.pointer, sizeof(cid) - 1);
break;
case ACPI_TYPE_PACKAGE:
/* TBD: Support CID packages */
break;
}
if (!cid[0]) {
acpi_os_free(buffer.pointer);
return -ENOENT;
}
if (strstr(driver->ids, cid)) {
acpi_os_free(buffer.pointer);
return 0;
}
acpi_os_free(buffer.pointer);
}
return -ENOENT;
}
/**
* acpi_bus_driver_init
* --------------------
* Used to initialize a device via its device driver. Called whenever a
* driver is bound to a device. Invokes the driver's add() and start() ops.
*/
static int
acpi_bus_driver_init (
struct acpi_device *device,
struct acpi_driver *driver)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
if (!device || !driver)
return_VALUE(-EINVAL);
if (!driver->ops.add)
return_VALUE(-ENOSYS);
result = driver->ops.add(device);
if (result) {
device->driver = NULL;
acpi_driver_data(device) = NULL;
return_VALUE(result);
}
/*
* TBD - Configuration Management: Assign resources to device based
* upon possible configuration and currently allocated resources.
*/
if (driver->ops.start) {
result = driver->ops.start(device);
if (result && driver->ops.remove)
driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
return_VALUE(result);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver successfully bound to device\n"));
#ifdef CONFIG_LDM
/*
* Update the device information (in the global device hierarchy) now
* that there's a driver bound to it.
*/
strncpy(device->dev.name, device->pnp.device_name,
sizeof(device->dev.name));
#endif
if (driver->ops.scan) {
driver->ops.scan(device);
}
return_VALUE(0);
}
/**
* acpi_bus_attach
* -------------
* Callback for acpi_bus_walk() used to find devices that match a specific
* driver's criteria and then attach the driver.
*/
static int
acpi_bus_attach (
struct acpi_device *device,
int level,
void *data)
{
int result = 0;
struct acpi_driver *driver = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_attach");
if (!device || !data)
return_VALUE(-EINVAL);
driver = (struct acpi_driver *) data;
if (device->driver)
return_VALUE(-EEXIST);
if (!device->status.present)
return_VALUE(-ENODEV);
result = acpi_bus_match(device, driver);
if (result)
return_VALUE(result);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
driver->name, device->pnp.bus_id));
result = acpi_bus_driver_init(device, driver);
if (result)
return_VALUE(result);
down(&acpi_bus_drivers_lock);
++driver->references;
up(&acpi_bus_drivers_lock);
return_VALUE(0);
}
/**
* acpi_bus_unattach
* -----------------
* Callback for acpi_bus_walk() used to find devices that match a specific
* driver's criteria and unattach the driver.
*/
static int
acpi_bus_unattach (
struct acpi_device *device,
int level,
void *data)
{
int result = 0;
struct acpi_driver *driver = (struct acpi_driver *) data;
ACPI_FUNCTION_TRACE("acpi_bus_unattach");
if (!device || !driver)
return_VALUE(-EINVAL);
if (device->driver != driver)
return_VALUE(-ENOENT);
if (!driver->ops.remove)
return_VALUE(-ENOSYS);
result = driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
if (result)
return_VALUE(result);
device->driver = NULL;
acpi_driver_data(device) = NULL;
down(&acpi_bus_drivers_lock);
driver->references--;
up(&acpi_bus_drivers_lock);
return_VALUE(0);
}
/**
* acpi_bus_register_driver
* ------------------------
* Registers a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and binds.
*/
int
acpi_bus_register_driver (
struct acpi_driver *driver)
{
ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
if (!driver)
return_VALUE(-EINVAL);
down(&acpi_bus_drivers_lock);
list_add_tail(&driver->node, &acpi_bus_drivers);
up(&acpi_bus_drivers_lock);
acpi_bus_walk(acpi_root, acpi_bus_attach,
WALK_DOWN, driver);
return_VALUE(driver->references);
}
/**
* acpi_bus_unregister_driver
* --------------------------
* Unregisters a driver with the ACPI bus. Searches the namespace for all
* devices that match the driver's criteria and unbinds.
*/
int
acpi_bus_unregister_driver (
struct acpi_driver *driver)
{
ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
if (!driver)
return_VALUE(-EINVAL);
acpi_bus_walk(acpi_root, acpi_bus_unattach, WALK_UP, driver);
if (driver->references)
return_VALUE(driver->references);
down(&acpi_bus_drivers_lock);
list_del(&driver->node);
up(&acpi_bus_drivers_lock);
return_VALUE(0);
}
/**
* acpi_bus_find_driver
* --------------------
* Parses the list of registered drivers looking for a driver applicable for
* the specified device.
*/
static int
acpi_bus_find_driver (
struct acpi_device *device)
{
int result = -ENODEV;
struct list_head *entry = NULL;
struct acpi_driver *driver = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
if (!device || device->driver)
return_VALUE(-EINVAL);
down(&acpi_bus_drivers_lock);
list_for_each(entry, &acpi_bus_drivers) {
driver = list_entry(entry, struct acpi_driver, node);
if (acpi_bus_match(device, driver))
continue;
result = acpi_bus_driver_init(device, driver);
if (!result)
++driver->references;
break;
}
up(&acpi_bus_drivers_lock);
return_VALUE(result);
}
/* --------------------------------------------------------------------------
Device Enumeration
-------------------------------------------------------------------------- */
static int
acpi_bus_get_flags (
struct acpi_device *device)
{
acpi_status status = AE_OK;
acpi_handle temp = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
/* Presence of _STA indicates 'dynamic_status' */
status = acpi_get_handle(device->handle, "_STA", &temp);
if (ACPI_SUCCESS(status))
device->flags.dynamic_status = 1;
/* Presence of _CID indicates 'compatible_ids' */
status = acpi_get_handle(device->handle, "_CID", &temp);
if (ACPI_SUCCESS(status))
device->flags.compatible_ids = 1;
/* Presence of _RMV indicates 'removable' */
status = acpi_get_handle(device->handle, "_RMV", &temp);
if (ACPI_SUCCESS(status))
device->flags.removable = 1;
/* Presence of _EJD|_EJ0 indicates 'ejectable' */
status = acpi_get_handle(device->handle, "_EJD", &temp);
if (ACPI_SUCCESS(status))
device->flags.ejectable = 1;
else {
status = acpi_get_handle(device->handle, "_EJ0", &temp);
if (ACPI_SUCCESS(status))
device->flags.ejectable = 1;
}
/* Presence of _LCK indicates 'lockable' */
status = acpi_get_handle(device->handle, "_LCK", &temp);
if (ACPI_SUCCESS(status))
device->flags.lockable = 1;
/* Presence of _PS0|_PR0 indicates 'power manageable' */
status = acpi_get_handle(device->handle, "_PS0", &temp);
if (ACPI_FAILURE(status))
status = acpi_get_handle(device->handle, "_PR0", &temp);
if (ACPI_SUCCESS(status))
device->flags.power_manageable = 1;
/* TBD: Peformance management */
return_VALUE(0);
}
static int
acpi_bus_remove (
struct acpi_device *device,
int type)
{
ACPI_FUNCTION_TRACE("acpi_bus_remove");
if (!device)
return_VALUE(-ENODEV);
acpi_device_unregister(device);
kfree(device);
return_VALUE(0);
}
static int
acpi_bus_add (
struct acpi_device **child,
struct acpi_device *parent,
acpi_handle handle,
int type)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_device *device = NULL;
char bus_id[5] = {'?',0};
acpi_buffer buffer = {sizeof(bus_id), bus_id};
acpi_device_info info;
char *hid = NULL;
char *uid = NULL;
int i = 0;
ACPI_FUNCTION_TRACE("acpi_bus_add");
if (!child)
return_VALUE(-EINVAL);
device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
if (!device) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
return_VALUE(-ENOMEM);
}
memset(device, 0, sizeof(struct acpi_device));
device->handle = handle;
device->parent = parent;
memset(&info, 0, sizeof(acpi_device_info));
/*
* 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:
sprintf(device->pnp.bus_id, "%s", "ACPI");
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
sprintf(device->pnp.bus_id, "%s", "PWRF");
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
sprintf(device->pnp.bus_id, "%s", "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;
}
sprintf(device->pnp.bus_id, "%s", bus_id);
break;
}
/*
* 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()
* objects (e.g. thermal zones, power resources, processors, 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_DEVICE:
result = acpi_bus_get_status(device);
if (result)
goto end;
break;
default:
STRUCT_TO_INT(device->status) = 0x0F;
break;
}
if (!device->status.present) {
result = -ENOENT;
goto end;
}
/*
* Initialize Device
* -----------------
* TBD: Synch with Core's enumeration/initialization process.
*/
/*
* Hardware ID, Unique ID, & Bus Address
* -------------------------------------
*/
switch (type) {
case ACPI_BUS_TYPE_DEVICE:
status = acpi_get_object_info(handle, &info);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error reading device info\n"));
result = -ENODEV;
goto end;
}
/* Clean up info strings (not NULL terminated) */
info.hardware_id[sizeof(info.hardware_id)-1] = '\0';
info.unique_id[sizeof(info.unique_id)-1] = '\0';
if (info.valid & ACPI_VALID_HID)
hid = info.hardware_id;
if (info.valid & ACPI_VALID_UID)
uid = info.unique_id;
if (info.valid & ACPI_VALID_ADR) {
device->pnp.bus_address = info.address;
device->flags.bus_address = 1;
}
break;
case ACPI_BUS_TYPE_POWER:
hid = ACPI_POWER_HID;
break;
case ACPI_BUS_TYPE_PROCESSOR:
hid = ACPI_PROCESSOR_HID;
break;
case ACPI_BUS_TYPE_SYSTEM:
hid = ACPI_SYSTEM_HID;
break;
case ACPI_BUS_TYPE_THERMAL:
hid = ACPI_THERMAL_HID;
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
hid = ACPI_BUTTON_HID_POWERF;
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
hid = ACPI_BUTTON_HID_SLEEPF;
break;
}
/*
* \_SB
* ----
* Fix for the system root bus device -- the only root-level device.
*/
if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
hid = ACPI_BUS_HID;
sprintf(device->pnp.device_name, "%s", ACPI_BUS_DEVICE_NAME);
sprintf(device->pnp.device_class, "%s", ACPI_BUS_CLASS);
}
if (hid) {
sprintf(device->pnp.hardware_id, "%s", hid);
device->flags.hardware_id = 1;
}
if (uid) {
sprintf(device->pnp.unique_id, "%s", uid);
device->flags.unique_id = 1;
}
/*
* Power Management
* ----------------
*/
if (device->flags.power_manageable) {
result = acpi_bus_get_power_flags(device);
if (result)
goto end;
}
/*
* Performance Management
* ----------------------
*/
if (device->flags.performance_manageable) {
result = acpi_bus_get_perf_flags(device);
if (result)
goto end;
}
/*
* 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.
*/
switch (type) {
case ACPI_BUS_TYPE_POWER_BUTTON:
case ACPI_BUS_TYPE_SLEEP_BUTTON:
break;
default:
status = acpi_attach_data(device->handle,
acpi_bus_data_handler, device);
break;
}
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error attaching device data\n"));
result = -ENODEV;
goto end;
}
/*
* Linkage
* -------
* Link this device to its parent and siblings.
*/
INIT_LIST_HEAD(&device->children);
if (!device->parent)
INIT_LIST_HEAD(&device->node);
else
list_add_tail(&device->node, &device->parent->children);
#ifdef CONFIG_ACPI_DEBUG
{
char *type_string = NULL;
char name[80] = {'?','\0'};
acpi_buffer buffer = {sizeof(name), name};
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
switch (type) {
case ACPI_BUS_TYPE_DEVICE:
type_string = "Device";
break;
case ACPI_BUS_TYPE_POWER:
type_string = "Power Resource";
break;
case ACPI_BUS_TYPE_PROCESSOR:
type_string = "Processor";
break;
case ACPI_BUS_TYPE_SYSTEM:
type_string = "System";
break;
case ACPI_BUS_TYPE_THERMAL:
type_string = "Thermal Zone";
break;
case ACPI_BUS_TYPE_POWER_BUTTON:
type_string = "Power Button";
sprintf(name, "PWRB");
break;
case ACPI_BUS_TYPE_SLEEP_BUTTON:
type_string = "Sleep Button";
sprintf(name, "SLPB");
break;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s %s [%p]\n",
type_string, name, handle));
}
#endif /*CONFIG_ACPI_DEBUG*/
/*
* Global Device Hierarchy:
* ------------------------
* Register this device with the global device hierarchy.
*/
acpi_device_register(device, parent);
/*
* Bind _ADR-Based Devices
* -----------------------
* If there's a a bus address (_ADR) then we utilize the parent's
* 'bind' function (if exists) to bind the ACPI- and natively-
* enumerated device representations.
*/
if (device->flags.bus_address) {
if (device->parent && device->parent->ops.bind)
device->parent->ops.bind(device);
}
/*
* Locate & Attach Driver
* ----------------------
* If there's a hardware id (_HID) or compatible ids (_CID) we check
* to see if there's a driver installed for this kind of device. Note
* that drivers can install before or after a device in enumerated.
*
* TBD: Assumes LDM provides driver hot-plug capability.
*/
if (device->flags.hardware_id || device->flags.compatible_ids)
acpi_bus_find_driver(device);
end:
if (result) {
kfree(device);
return_VALUE(result);
}
*child = device;
return_VALUE(0);
}
static int acpi_bus_scan (struct acpi_device *start)
{
acpi_status status = AE_OK;
struct acpi_device *parent = NULL;
struct acpi_device *child = NULL;
acpi_handle phandle = 0;
acpi_handle chandle = 0;
acpi_object_type type = 0;
u32 level = 1;
ACPI_FUNCTION_TRACE("acpi_bus_scan");
if (!start)
return_VALUE(-EINVAL);
parent = start;
phandle = start->handle;
/*
* Parse through the ACPI namespace, identify all 'devices', and
* create a new 'struct acpi_device' for each.
*/
while ((level > 0) && parent) {
status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
chandle, &chandle);
/*
* If this scope is exhausted then move our way back up.
*/
if (ACPI_FAILURE(status)) {
level--;
chandle = phandle;
acpi_get_parent(phandle, &phandle);
if (parent->parent)
parent = parent->parent;
continue;
}
status = acpi_get_type(chandle, &type);
if (ACPI_FAILURE(status))
continue;
/*
* If this is a scope object then parse it (depth-first).
*/
if (type == ACPI_TYPE_ANY) {
/* Hack to get around scope identity problem */
status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, 0, NULL);
if (ACPI_SUCCESS(status)) {
level++;
phandle = chandle;
chandle = 0;
}
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;
}
status = acpi_bus_add(&child, parent, chandle, type);
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,
0, NULL);
if (ACPI_SUCCESS(status)) {
level++;
phandle = chandle;
chandle = 0;
parent = child;
}
}
}
return_VALUE(0);
}
static int
acpi_bus_scan_fixed (
struct acpi_device *root)
{
int result = 0;
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
if (!root)
return_VALUE(-ENODEV);
/*
* Enumerate all fixed-feature devices.
*/
if (acpi_fadt.pwr_button == 0)
result = acpi_bus_add(&device, acpi_root,
ACPI_ROOT_OBJECT, ACPI_BUS_TYPE_POWER_BUTTON);
if (acpi_fadt.sleep_button == 0)
result = acpi_bus_add(&device, acpi_root,
ACPI_ROOT_OBJECT, ACPI_BUS_TYPE_SLEEP_BUTTON);
return_VALUE(result);
}
static int __init acpi_scan_init(void)
{
int result;
ACPI_FUNCTION_TRACE("acpi_scan_init");
if (acpi_disabled)
return_VALUE(0);
/*
* Create the root device in the bus's device tree
*/
result = acpi_bus_add(&acpi_root, NULL, ACPI_ROOT_OBJECT,
ACPI_BUS_TYPE_SYSTEM);
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);
if (result)
acpi_bus_remove(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
Done:
return_VALUE(result);
}
subsys_initcall(acpi_scan_init);
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