3fb02738b0
Create new interfaces to recursively add an acpi namespace object to the acpi device list, and recursively start the namespace object. This is needed for ACPI based hotplug of a root bridge hierarchy where the add operation must be performed first and the start operation must be performed separately after the hot-plugged devices have been properly configured. Signed-off-by: Rajesh Shah <rajesh.shah@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1456 lines
34 KiB
C
1456 lines
34 KiB
C
/*
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* scan.c - support for transforming the ACPI namespace into individual objects
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
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#define _COMPONENT ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME ("scan")
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#define STRUCT_TO_INT(s) (*((int*)&s))
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extern struct acpi_device *acpi_root;
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#define ACPI_BUS_CLASS "system_bus"
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#define ACPI_BUS_HID "ACPI_BUS"
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#define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver"
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#define ACPI_BUS_DEVICE_NAME "System Bus"
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static LIST_HEAD(acpi_device_list);
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DEFINE_SPINLOCK(acpi_device_lock);
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LIST_HEAD(acpi_wakeup_device_list);
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static int
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acpi_bus_trim(struct acpi_device *start,
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int rmdevice);
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static void acpi_device_release(struct kobject * kobj)
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{
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struct acpi_device * dev = container_of(kobj,struct acpi_device,kobj);
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if (dev->pnp.cid_list)
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kfree(dev->pnp.cid_list);
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kfree(dev);
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}
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struct acpi_device_attribute {
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struct attribute attr;
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ssize_t (*show)(struct acpi_device *, char *);
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ssize_t (*store)(struct acpi_device *, const char *, size_t);
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};
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typedef void acpi_device_sysfs_files(struct kobject *,
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const struct attribute *);
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static void setup_sys_fs_device_files(struct acpi_device *dev,
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acpi_device_sysfs_files *func);
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#define create_sysfs_device_files(dev) \
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setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
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#define remove_sysfs_device_files(dev) \
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setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
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#define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
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#define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
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static ssize_t acpi_device_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct acpi_device *device = to_acpi_device(kobj);
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struct acpi_device_attribute *attribute = to_handle_attr(attr);
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return attribute->show ? attribute->show(device, buf) : -EIO;
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}
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static ssize_t acpi_device_attr_store(struct kobject *kobj,
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struct attribute *attr, const char *buf, size_t len)
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{
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struct acpi_device *device = to_acpi_device(kobj);
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struct acpi_device_attribute *attribute = to_handle_attr(attr);
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return attribute->store ? attribute->store(device, buf, len) : -EIO;
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}
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static struct sysfs_ops acpi_device_sysfs_ops = {
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.show = acpi_device_attr_show,
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.store = acpi_device_attr_store,
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};
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static struct kobj_type ktype_acpi_ns = {
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.sysfs_ops = &acpi_device_sysfs_ops,
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.release = acpi_device_release,
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};
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static int namespace_hotplug(struct kset *kset, struct kobject *kobj,
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char **envp, int num_envp, char *buffer,
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int buffer_size)
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{
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struct acpi_device *dev = to_acpi_device(kobj);
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int i = 0;
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int len = 0;
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if (!dev->driver)
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return 0;
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if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &len,
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"PHYSDEVDRIVER=%s", dev->driver->name))
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return -ENOMEM;
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envp[i] = NULL;
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return 0;
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}
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static struct kset_hotplug_ops namespace_hotplug_ops = {
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.hotplug = &namespace_hotplug,
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};
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static struct kset acpi_namespace_kset = {
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.kobj = {
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.name = "namespace",
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},
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.subsys = &acpi_subsys,
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.ktype = &ktype_acpi_ns,
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.hotplug_ops = &namespace_hotplug_ops,
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};
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static void acpi_device_register(struct acpi_device * device, struct acpi_device * parent)
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{
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/*
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* Linkage
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* -------
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* Link this device to its parent and siblings.
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*/
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INIT_LIST_HEAD(&device->children);
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INIT_LIST_HEAD(&device->node);
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INIT_LIST_HEAD(&device->g_list);
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INIT_LIST_HEAD(&device->wakeup_list);
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spin_lock(&acpi_device_lock);
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if (device->parent) {
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list_add_tail(&device->node, &device->parent->children);
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list_add_tail(&device->g_list,&device->parent->g_list);
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} else
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list_add_tail(&device->g_list,&acpi_device_list);
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if (device->wakeup.flags.valid)
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list_add_tail(&device->wakeup_list,&acpi_wakeup_device_list);
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spin_unlock(&acpi_device_lock);
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strlcpy(device->kobj.name,device->pnp.bus_id,KOBJ_NAME_LEN);
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if (parent)
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device->kobj.parent = &parent->kobj;
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device->kobj.ktype = &ktype_acpi_ns;
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device->kobj.kset = &acpi_namespace_kset;
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kobject_register(&device->kobj);
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create_sysfs_device_files(device);
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}
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static int
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acpi_device_unregister (
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struct acpi_device *device,
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int type)
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{
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spin_lock(&acpi_device_lock);
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if (device->parent) {
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list_del(&device->node);
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list_del(&device->g_list);
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} else
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list_del(&device->g_list);
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list_del(&device->wakeup_list);
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spin_unlock(&acpi_device_lock);
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acpi_detach_data(device->handle, acpi_bus_data_handler);
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remove_sysfs_device_files(device);
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kobject_unregister(&device->kobj);
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return 0;
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}
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void
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acpi_bus_data_handler (
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acpi_handle handle,
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u32 function,
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void *context)
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{
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ACPI_FUNCTION_TRACE("acpi_bus_data_handler");
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/* TBD */
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return_VOID;
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}
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static int
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acpi_bus_get_power_flags (
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struct acpi_device *device)
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{
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acpi_status status = 0;
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acpi_handle handle = NULL;
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u32 i = 0;
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ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags");
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/*
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* Power Management Flags
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*/
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status = acpi_get_handle(device->handle, "_PSC", &handle);
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if (ACPI_SUCCESS(status))
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device->power.flags.explicit_get = 1;
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status = acpi_get_handle(device->handle, "_IRC", &handle);
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if (ACPI_SUCCESS(status))
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device->power.flags.inrush_current = 1;
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/*
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* Enumerate supported power management states
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*/
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for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
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struct acpi_device_power_state *ps = &device->power.states[i];
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char object_name[5] = {'_','P','R','0'+i,'\0'};
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/* Evaluate "_PRx" to se if power resources are referenced */
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acpi_evaluate_reference(device->handle, object_name, NULL,
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&ps->resources);
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if (ps->resources.count) {
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device->power.flags.power_resources = 1;
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ps->flags.valid = 1;
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}
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/* Evaluate "_PSx" to see if we can do explicit sets */
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object_name[2] = 'S';
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status = acpi_get_handle(device->handle, object_name, &handle);
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if (ACPI_SUCCESS(status)) {
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ps->flags.explicit_set = 1;
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ps->flags.valid = 1;
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}
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/* State is valid if we have some power control */
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if (ps->resources.count || ps->flags.explicit_set)
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ps->flags.valid = 1;
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ps->power = -1; /* Unknown - driver assigned */
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ps->latency = -1; /* Unknown - driver assigned */
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}
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/* Set defaults for D0 and D3 states (always valid) */
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device->power.states[ACPI_STATE_D0].flags.valid = 1;
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device->power.states[ACPI_STATE_D0].power = 100;
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device->power.states[ACPI_STATE_D3].flags.valid = 1;
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device->power.states[ACPI_STATE_D3].power = 0;
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/* TBD: System wake support and resource requirements. */
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device->power.state = ACPI_STATE_UNKNOWN;
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return_VALUE(0);
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}
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int
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acpi_match_ids (
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struct acpi_device *device,
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char *ids)
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{
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int error = 0;
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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if (device->flags.hardware_id)
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if (strstr(ids, device->pnp.hardware_id))
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goto Done;
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if (device->flags.compatible_ids) {
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struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
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int i;
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/* compare multiple _CID entries against driver ids */
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for (i = 0; i < cid_list->count; i++)
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{
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if (strstr(ids, cid_list->id[i].value))
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goto Done;
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}
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}
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error = -ENOENT;
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Done:
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if (buffer.pointer)
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acpi_os_free(buffer.pointer);
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return error;
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}
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static acpi_status
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acpi_bus_extract_wakeup_device_power_package (
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struct acpi_device *device,
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union acpi_object *package)
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{
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int i = 0;
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union acpi_object *element = NULL;
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if (!device || !package || (package->package.count < 2))
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return AE_BAD_PARAMETER;
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element = &(package->package.elements[0]);
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if (!element)
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return AE_BAD_PARAMETER;
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if (element->type == ACPI_TYPE_PACKAGE) {
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if ((element->package.count < 2) ||
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(element->package.elements[0].type != ACPI_TYPE_LOCAL_REFERENCE) ||
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(element->package.elements[1].type != ACPI_TYPE_INTEGER))
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return AE_BAD_DATA;
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device->wakeup.gpe_device = element->package.elements[0].reference.handle;
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device->wakeup.gpe_number = (u32)element->package.elements[1].integer.value;
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}else if (element->type == ACPI_TYPE_INTEGER) {
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device->wakeup.gpe_number = element->integer.value;
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}else
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return AE_BAD_DATA;
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element = &(package->package.elements[1]);
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if (element->type != ACPI_TYPE_INTEGER) {
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return AE_BAD_DATA;
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}
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device->wakeup.sleep_state = element->integer.value;
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if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
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return AE_NO_MEMORY;
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}
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device->wakeup.resources.count = package->package.count - 2;
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for (i=0; i < device->wakeup.resources.count; i++) {
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element = &(package->package.elements[i + 2]);
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if (element->type != ACPI_TYPE_ANY ) {
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return AE_BAD_DATA;
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}
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device->wakeup.resources.handles[i] = element->reference.handle;
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}
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return AE_OK;
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}
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static int
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acpi_bus_get_wakeup_device_flags (
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struct acpi_device *device)
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{
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acpi_status status = 0;
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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union acpi_object *package = NULL;
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ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags");
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/* _PRW */
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status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n"));
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goto end;
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}
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package = (union acpi_object *) buffer.pointer;
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status = acpi_bus_extract_wakeup_device_power_package(device, package);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _PRW package\n"));
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goto end;
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}
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acpi_os_free(buffer.pointer);
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device->wakeup.flags.valid = 1;
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/* Power button, Lid switch always enable wakeup*/
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if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))
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device->wakeup.flags.run_wake = 1;
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end:
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if (ACPI_FAILURE(status))
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device->flags.wake_capable = 0;
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return_VALUE(0);
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}
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/* --------------------------------------------------------------------------
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ACPI hotplug sysfs device file support
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-------------------------------------------------------------------------- */
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static ssize_t acpi_eject_store(struct acpi_device *device,
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const char *buf, size_t count);
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#define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
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static struct acpi_device_attribute acpi_device_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
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/**
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* setup_sys_fs_device_files - sets up the device files under device namespace
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* @dev: acpi_device object
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* @func: function pointer to create or destroy the device file
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*/
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static void
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setup_sys_fs_device_files (
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struct acpi_device *dev,
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acpi_device_sysfs_files *func)
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{
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acpi_status status;
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acpi_handle temp = NULL;
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/*
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* If device has _EJ0, 'eject' file is created that is used to trigger
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* hot-removal function from userland.
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*/
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status = acpi_get_handle(dev->handle, "_EJ0", &temp);
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if (ACPI_SUCCESS(status))
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(*(func))(&dev->kobj,&acpi_device_attr_eject.attr);
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}
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static int
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acpi_eject_operation(acpi_handle handle, int lockable)
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{
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struct acpi_object_list arg_list;
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union acpi_object arg;
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acpi_status status = AE_OK;
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/*
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* TBD: evaluate _PS3?
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*/
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if (lockable) {
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = 0;
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acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
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}
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = 1;
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/*
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* TBD: _EJD support.
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*/
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status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
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if (ACPI_FAILURE(status)) {
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return(-ENODEV);
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}
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return(0);
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}
|
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|
|
|
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static ssize_t
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acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
|
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{
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int result;
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int ret = count;
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int islockable;
|
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acpi_status status;
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acpi_handle handle;
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acpi_object_type type = 0;
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|
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if ((!count) || (buf[0] != '1')) {
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return -EINVAL;
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}
|
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|
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#ifndef FORCE_EJECT
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if (device->driver == NULL) {
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ret = -ENODEV;
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goto err;
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}
|
|
#endif
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status = acpi_get_type(device->handle, &type);
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if (ACPI_FAILURE(status) || (!device->flags.ejectable) ) {
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ret = -ENODEV;
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goto err;
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}
|
|
|
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islockable = device->flags.lockable;
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handle = device->handle;
|
|
|
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if (type == ACPI_TYPE_PROCESSOR)
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result = acpi_bus_trim(device, 0);
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else
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result = acpi_bus_trim(device, 1);
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|
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if (!result)
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result = acpi_eject_operation(handle, islockable);
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|
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if (result) {
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ret = -EBUSY;
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}
|
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err:
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return ret;
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}
|
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|
|
|
|
/* --------------------------------------------------------------------------
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|
Performance Management
|
|
-------------------------------------------------------------------------- */
|
|
|
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static int
|
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acpi_bus_get_perf_flags (
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struct acpi_device *device)
|
|
{
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device->performance.state = ACPI_STATE_UNKNOWN;
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return 0;
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}
|
|
|
|
/* --------------------------------------------------------------------------
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|
Driver Management
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static LIST_HEAD(acpi_bus_drivers);
|
|
static DECLARE_MUTEX(acpi_bus_drivers_lock);
|
|
|
|
|
|
/**
|
|
* acpi_bus_match
|
|
* --------------
|
|
* Checks the device's hardware (_HID) or compatible (_CID) ids to see if it
|
|
* matches the specified driver's criteria.
|
|
*/
|
|
static int
|
|
acpi_bus_match (
|
|
struct acpi_device *device,
|
|
struct acpi_driver *driver)
|
|
{
|
|
if (driver && driver->ops.match)
|
|
return driver->ops.match(device, driver);
|
|
return acpi_match_ids(device, driver->ids);
|
|
}
|
|
|
|
|
|
/**
|
|
* acpi_bus_driver_init
|
|
* --------------------
|
|
* Used to initialize a device via its device driver. Called whenever a
|
|
* driver is bound to a device. Invokes the driver's add() and start() ops.
|
|
*/
|
|
static int
|
|
acpi_bus_driver_init (
|
|
struct acpi_device *device,
|
|
struct acpi_driver *driver)
|
|
{
|
|
int result = 0;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_driver_init");
|
|
|
|
if (!device || !driver)
|
|
return_VALUE(-EINVAL);
|
|
|
|
if (!driver->ops.add)
|
|
return_VALUE(-ENOSYS);
|
|
|
|
result = driver->ops.add(device);
|
|
if (result) {
|
|
device->driver = NULL;
|
|
acpi_driver_data(device) = NULL;
|
|
return_VALUE(result);
|
|
}
|
|
|
|
device->driver = driver;
|
|
|
|
/*
|
|
* TBD - Configuration Management: Assign resources to device based
|
|
* upon possible configuration and currently allocated resources.
|
|
*/
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver successfully bound to device\n"));
|
|
return_VALUE(0);
|
|
}
|
|
|
|
int
|
|
acpi_start_single_object (
|
|
struct acpi_device *device)
|
|
{
|
|
int result = 0;
|
|
struct acpi_driver *driver;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_start_single_object");
|
|
|
|
if (!(driver = device->driver))
|
|
return_VALUE(0);
|
|
|
|
if (driver->ops.start) {
|
|
result = driver->ops.start(device);
|
|
if (result && driver->ops.remove)
|
|
driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
|
|
}
|
|
|
|
return_VALUE(result);
|
|
}
|
|
|
|
static int acpi_driver_attach(struct acpi_driver * drv)
|
|
{
|
|
struct list_head * node, * next;
|
|
int count = 0;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_driver_attach");
|
|
|
|
spin_lock(&acpi_device_lock);
|
|
list_for_each_safe(node, next, &acpi_device_list) {
|
|
struct acpi_device * dev = container_of(node, struct acpi_device, g_list);
|
|
|
|
if (dev->driver || !dev->status.present)
|
|
continue;
|
|
spin_unlock(&acpi_device_lock);
|
|
|
|
if (!acpi_bus_match(dev, drv)) {
|
|
if (!acpi_bus_driver_init(dev, drv)) {
|
|
acpi_start_single_object(dev);
|
|
atomic_inc(&drv->references);
|
|
count++;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
|
|
drv->name, dev->pnp.bus_id));
|
|
}
|
|
}
|
|
spin_lock(&acpi_device_lock);
|
|
}
|
|
spin_unlock(&acpi_device_lock);
|
|
return_VALUE(count);
|
|
}
|
|
|
|
static int acpi_driver_detach(struct acpi_driver * drv)
|
|
{
|
|
struct list_head * node, * next;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_driver_detach");
|
|
|
|
spin_lock(&acpi_device_lock);
|
|
list_for_each_safe(node,next,&acpi_device_list) {
|
|
struct acpi_device * dev = container_of(node,struct acpi_device,g_list);
|
|
|
|
if (dev->driver == drv) {
|
|
spin_unlock(&acpi_device_lock);
|
|
if (drv->ops.remove)
|
|
drv->ops.remove(dev,ACPI_BUS_REMOVAL_NORMAL);
|
|
spin_lock(&acpi_device_lock);
|
|
dev->driver = NULL;
|
|
dev->driver_data = NULL;
|
|
atomic_dec(&drv->references);
|
|
}
|
|
}
|
|
spin_unlock(&acpi_device_lock);
|
|
return_VALUE(0);
|
|
}
|
|
|
|
/**
|
|
* acpi_bus_register_driver
|
|
* ------------------------
|
|
* Registers a driver with the ACPI bus. Searches the namespace for all
|
|
* devices that match the driver's criteria and binds. Returns the
|
|
* number of devices that were claimed by the driver, or a negative
|
|
* error status for failure.
|
|
*/
|
|
int
|
|
acpi_bus_register_driver (
|
|
struct acpi_driver *driver)
|
|
{
|
|
int count;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
|
|
|
|
if (acpi_disabled)
|
|
return_VALUE(-ENODEV);
|
|
|
|
if (!driver)
|
|
return_VALUE(-EINVAL);
|
|
|
|
spin_lock(&acpi_device_lock);
|
|
list_add_tail(&driver->node, &acpi_bus_drivers);
|
|
spin_unlock(&acpi_device_lock);
|
|
count = acpi_driver_attach(driver);
|
|
|
|
return_VALUE(count);
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_register_driver);
|
|
|
|
|
|
/**
|
|
* acpi_bus_unregister_driver
|
|
* --------------------------
|
|
* Unregisters a driver with the ACPI bus. Searches the namespace for all
|
|
* devices that match the driver's criteria and unbinds.
|
|
*/
|
|
int
|
|
acpi_bus_unregister_driver (
|
|
struct acpi_driver *driver)
|
|
{
|
|
int error = 0;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
|
|
|
|
if (driver) {
|
|
acpi_driver_detach(driver);
|
|
|
|
if (!atomic_read(&driver->references)) {
|
|
spin_lock(&acpi_device_lock);
|
|
list_del_init(&driver->node);
|
|
spin_unlock(&acpi_device_lock);
|
|
}
|
|
} else
|
|
error = -EINVAL;
|
|
return_VALUE(error);
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_unregister_driver);
|
|
|
|
/**
|
|
* acpi_bus_find_driver
|
|
* --------------------
|
|
* Parses the list of registered drivers looking for a driver applicable for
|
|
* the specified device.
|
|
*/
|
|
static int
|
|
acpi_bus_find_driver (
|
|
struct acpi_device *device)
|
|
{
|
|
int result = 0;
|
|
struct list_head * node, *next;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_find_driver");
|
|
|
|
spin_lock(&acpi_device_lock);
|
|
list_for_each_safe(node,next,&acpi_bus_drivers) {
|
|
struct acpi_driver * driver = container_of(node,struct acpi_driver,node);
|
|
|
|
atomic_inc(&driver->references);
|
|
spin_unlock(&acpi_device_lock);
|
|
if (!acpi_bus_match(device, driver)) {
|
|
result = acpi_bus_driver_init(device, driver);
|
|
if (!result)
|
|
goto Done;
|
|
}
|
|
atomic_dec(&driver->references);
|
|
spin_lock(&acpi_device_lock);
|
|
}
|
|
spin_unlock(&acpi_device_lock);
|
|
|
|
Done:
|
|
return_VALUE(result);
|
|
}
|
|
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Device Enumeration
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static int
|
|
acpi_bus_get_flags (
|
|
struct acpi_device *device)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
acpi_handle temp = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_get_flags");
|
|
|
|
/* Presence of _STA indicates 'dynamic_status' */
|
|
status = acpi_get_handle(device->handle, "_STA", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.dynamic_status = 1;
|
|
|
|
/* Presence of _CID indicates 'compatible_ids' */
|
|
status = acpi_get_handle(device->handle, "_CID", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.compatible_ids = 1;
|
|
|
|
/* Presence of _RMV indicates 'removable' */
|
|
status = acpi_get_handle(device->handle, "_RMV", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.removable = 1;
|
|
|
|
/* Presence of _EJD|_EJ0 indicates 'ejectable' */
|
|
status = acpi_get_handle(device->handle, "_EJD", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.ejectable = 1;
|
|
else {
|
|
status = acpi_get_handle(device->handle, "_EJ0", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.ejectable = 1;
|
|
}
|
|
|
|
/* Presence of _LCK indicates 'lockable' */
|
|
status = acpi_get_handle(device->handle, "_LCK", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.lockable = 1;
|
|
|
|
/* Presence of _PS0|_PR0 indicates 'power manageable' */
|
|
status = acpi_get_handle(device->handle, "_PS0", &temp);
|
|
if (ACPI_FAILURE(status))
|
|
status = acpi_get_handle(device->handle, "_PR0", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.power_manageable = 1;
|
|
|
|
/* Presence of _PRW indicates wake capable */
|
|
status = acpi_get_handle(device->handle, "_PRW", &temp);
|
|
if (ACPI_SUCCESS(status))
|
|
device->flags.wake_capable = 1;
|
|
|
|
/* TBD: Peformance management */
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
static void acpi_device_get_busid(struct acpi_device * device, acpi_handle handle, int type)
|
|
{
|
|
char bus_id[5] = {'?',0};
|
|
struct acpi_buffer buffer = {sizeof(bus_id), bus_id};
|
|
int i = 0;
|
|
|
|
/*
|
|
* Bus ID
|
|
* ------
|
|
* The device's Bus ID is simply the object name.
|
|
* TBD: Shouldn't this value be unique (within the ACPI namespace)?
|
|
*/
|
|
switch (type) {
|
|
case ACPI_BUS_TYPE_SYSTEM:
|
|
strcpy(device->pnp.bus_id, "ACPI");
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER_BUTTON:
|
|
strcpy(device->pnp.bus_id, "PWRF");
|
|
break;
|
|
case ACPI_BUS_TYPE_SLEEP_BUTTON:
|
|
strcpy(device->pnp.bus_id, "SLPF");
|
|
break;
|
|
default:
|
|
acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
|
|
/* Clean up trailing underscores (if any) */
|
|
for (i = 3; i > 1; i--) {
|
|
if (bus_id[i] == '_')
|
|
bus_id[i] = '\0';
|
|
else
|
|
break;
|
|
}
|
|
strcpy(device->pnp.bus_id, bus_id);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void acpi_device_set_id(struct acpi_device * device, struct acpi_device * parent,
|
|
acpi_handle handle, int type)
|
|
{
|
|
struct acpi_device_info *info;
|
|
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
char *hid = NULL;
|
|
char *uid = NULL;
|
|
struct acpi_compatible_id_list *cid_list = NULL;
|
|
acpi_status status;
|
|
|
|
switch (type) {
|
|
case ACPI_BUS_TYPE_DEVICE:
|
|
status = acpi_get_object_info(handle, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk("%s: Error reading device info\n",__FUNCTION__);
|
|
return;
|
|
}
|
|
|
|
info = buffer.pointer;
|
|
if (info->valid & ACPI_VALID_HID)
|
|
hid = info->hardware_id.value;
|
|
if (info->valid & ACPI_VALID_UID)
|
|
uid = info->unique_id.value;
|
|
if (info->valid & ACPI_VALID_CID)
|
|
cid_list = &info->compatibility_id;
|
|
if (info->valid & ACPI_VALID_ADR) {
|
|
device->pnp.bus_address = info->address;
|
|
device->flags.bus_address = 1;
|
|
}
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER:
|
|
hid = ACPI_POWER_HID;
|
|
break;
|
|
case ACPI_BUS_TYPE_PROCESSOR:
|
|
hid = ACPI_PROCESSOR_HID;
|
|
break;
|
|
case ACPI_BUS_TYPE_SYSTEM:
|
|
hid = ACPI_SYSTEM_HID;
|
|
break;
|
|
case ACPI_BUS_TYPE_THERMAL:
|
|
hid = ACPI_THERMAL_HID;
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER_BUTTON:
|
|
hid = ACPI_BUTTON_HID_POWERF;
|
|
break;
|
|
case ACPI_BUS_TYPE_SLEEP_BUTTON:
|
|
hid = ACPI_BUTTON_HID_SLEEPF;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* \_SB
|
|
* ----
|
|
* Fix for the system root bus device -- the only root-level device.
|
|
*/
|
|
if ((parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
|
|
hid = ACPI_BUS_HID;
|
|
strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
|
|
strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
|
|
}
|
|
|
|
if (hid) {
|
|
strcpy(device->pnp.hardware_id, hid);
|
|
device->flags.hardware_id = 1;
|
|
}
|
|
if (uid) {
|
|
strcpy(device->pnp.unique_id, uid);
|
|
device->flags.unique_id = 1;
|
|
}
|
|
if (cid_list) {
|
|
device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL);
|
|
if (device->pnp.cid_list)
|
|
memcpy(device->pnp.cid_list, cid_list, cid_list->size);
|
|
else
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
}
|
|
|
|
acpi_os_free(buffer.pointer);
|
|
}
|
|
|
|
static int acpi_device_set_context(struct acpi_device * device, int type)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
int result = 0;
|
|
/*
|
|
* Context
|
|
* -------
|
|
* Attach this 'struct acpi_device' to the ACPI object. This makes
|
|
* resolutions from handle->device very efficient. Note that we need
|
|
* to be careful with fixed-feature devices as they all attach to the
|
|
* root object.
|
|
*/
|
|
if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
|
|
type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
|
|
status = acpi_attach_data(device->handle,
|
|
acpi_bus_data_handler, device);
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
printk("Error attaching device data\n");
|
|
result = -ENODEV;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static void acpi_device_get_debug_info(struct acpi_device * device, acpi_handle handle, int type)
|
|
{
|
|
#ifdef CONFIG_ACPI_DEBUG_OUTPUT
|
|
char *type_string = NULL;
|
|
char name[80] = {'?','\0'};
|
|
struct acpi_buffer buffer = {sizeof(name), name};
|
|
|
|
switch (type) {
|
|
case ACPI_BUS_TYPE_DEVICE:
|
|
type_string = "Device";
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER:
|
|
type_string = "Power Resource";
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
break;
|
|
case ACPI_BUS_TYPE_PROCESSOR:
|
|
type_string = "Processor";
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
break;
|
|
case ACPI_BUS_TYPE_SYSTEM:
|
|
type_string = "System";
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
break;
|
|
case ACPI_BUS_TYPE_THERMAL:
|
|
type_string = "Thermal Zone";
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER_BUTTON:
|
|
type_string = "Power Button";
|
|
sprintf(name, "PWRB");
|
|
break;
|
|
case ACPI_BUS_TYPE_SLEEP_BUTTON:
|
|
type_string = "Sleep Button";
|
|
sprintf(name, "SLPB");
|
|
break;
|
|
}
|
|
|
|
printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle);
|
|
#endif /*CONFIG_ACPI_DEBUG_OUTPUT*/
|
|
}
|
|
|
|
|
|
static int
|
|
acpi_bus_remove (
|
|
struct acpi_device *dev,
|
|
int rmdevice)
|
|
{
|
|
int result = 0;
|
|
struct acpi_driver *driver;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_remove");
|
|
|
|
if (!dev)
|
|
return_VALUE(-EINVAL);
|
|
|
|
driver = dev->driver;
|
|
|
|
if ((driver) && (driver->ops.remove)) {
|
|
|
|
if (driver->ops.stop) {
|
|
result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT);
|
|
if (result)
|
|
return_VALUE(result);
|
|
}
|
|
|
|
result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT);
|
|
if (result) {
|
|
return_VALUE(result);
|
|
}
|
|
|
|
atomic_dec(&dev->driver->references);
|
|
dev->driver = NULL;
|
|
acpi_driver_data(dev) = NULL;
|
|
}
|
|
|
|
if (!rmdevice)
|
|
return_VALUE(0);
|
|
|
|
if (dev->flags.bus_address) {
|
|
if ((dev->parent) && (dev->parent->ops.unbind))
|
|
dev->parent->ops.unbind(dev);
|
|
}
|
|
|
|
acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
|
|
static int
|
|
acpi_add_single_object (
|
|
struct acpi_device **child,
|
|
struct acpi_device *parent,
|
|
acpi_handle handle,
|
|
int type)
|
|
{
|
|
int result = 0;
|
|
struct acpi_device *device = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_add_single_object");
|
|
|
|
if (!child)
|
|
return_VALUE(-EINVAL);
|
|
|
|
device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL);
|
|
if (!device) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
|
|
return_VALUE(-ENOMEM);
|
|
}
|
|
memset(device, 0, sizeof(struct acpi_device));
|
|
|
|
device->handle = handle;
|
|
device->parent = parent;
|
|
|
|
acpi_device_get_busid(device,handle,type);
|
|
|
|
/*
|
|
* Flags
|
|
* -----
|
|
* Get prior to calling acpi_bus_get_status() so we know whether
|
|
* or not _STA is present. Note that we only look for object
|
|
* handles -- cannot evaluate objects until we know the device is
|
|
* present and properly initialized.
|
|
*/
|
|
result = acpi_bus_get_flags(device);
|
|
if (result)
|
|
goto end;
|
|
|
|
/*
|
|
* Status
|
|
* ------
|
|
* See if the device is present. We always assume that non-Device()
|
|
* 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 (ACPI_FAILURE(result) || !device->status.present) {
|
|
result = -ENOENT;
|
|
goto end;
|
|
}
|
|
break;
|
|
default:
|
|
STRUCT_TO_INT(device->status) = 0x0F;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Initialize Device
|
|
* -----------------
|
|
* TBD: Synch with Core's enumeration/initialization process.
|
|
*/
|
|
|
|
/*
|
|
* Hardware ID, Unique ID, & Bus Address
|
|
* -------------------------------------
|
|
*/
|
|
acpi_device_set_id(device,parent,handle,type);
|
|
|
|
/*
|
|
* Power Management
|
|
* ----------------
|
|
*/
|
|
if (device->flags.power_manageable) {
|
|
result = acpi_bus_get_power_flags(device);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
|
|
/*
|
|
* Wakeup device management
|
|
*-----------------------
|
|
*/
|
|
if (device->flags.wake_capable) {
|
|
result = acpi_bus_get_wakeup_device_flags(device);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
|
|
/*
|
|
* Performance Management
|
|
* ----------------------
|
|
*/
|
|
if (device->flags.performance_manageable) {
|
|
result = acpi_bus_get_perf_flags(device);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
|
|
if ((result = acpi_device_set_context(device,type)))
|
|
goto end;
|
|
|
|
acpi_device_get_debug_info(device,handle,type);
|
|
|
|
acpi_device_register(device,parent);
|
|
|
|
/*
|
|
* Bind _ADR-Based Devices
|
|
* -----------------------
|
|
* If there's a a bus address (_ADR) then we utilize the parent's
|
|
* 'bind' function (if exists) to bind the ACPI- and natively-
|
|
* enumerated device representations.
|
|
*/
|
|
if (device->flags.bus_address) {
|
|
if (device->parent && device->parent->ops.bind)
|
|
device->parent->ops.bind(device);
|
|
}
|
|
|
|
/*
|
|
* Locate & Attach Driver
|
|
* ----------------------
|
|
* If there's a hardware id (_HID) or compatible ids (_CID) we check
|
|
* to see if there's a driver installed for this kind of device. Note
|
|
* that drivers can install before or after a device is enumerated.
|
|
*
|
|
* TBD: Assumes LDM provides driver hot-plug capability.
|
|
*/
|
|
result = acpi_bus_find_driver(device);
|
|
|
|
end:
|
|
if (!result)
|
|
*child = device;
|
|
else {
|
|
if (device->pnp.cid_list)
|
|
kfree(device->pnp.cid_list);
|
|
kfree(device);
|
|
}
|
|
|
|
return_VALUE(result);
|
|
}
|
|
|
|
|
|
static int acpi_bus_scan (struct acpi_device *start,
|
|
struct acpi_bus_ops *ops)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_device *parent = NULL;
|
|
struct acpi_device *child = NULL;
|
|
acpi_handle phandle = NULL;
|
|
acpi_handle chandle = NULL;
|
|
acpi_object_type type = 0;
|
|
u32 level = 1;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_scan");
|
|
|
|
if (!start)
|
|
return_VALUE(-EINVAL);
|
|
|
|
parent = start;
|
|
phandle = start->handle;
|
|
|
|
/*
|
|
* Parse through the ACPI namespace, identify all 'devices', and
|
|
* create a new 'struct acpi_device' for each.
|
|
*/
|
|
while ((level > 0) && parent) {
|
|
|
|
status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
|
|
chandle, &chandle);
|
|
|
|
/*
|
|
* If this scope is exhausted then move our way back up.
|
|
*/
|
|
if (ACPI_FAILURE(status)) {
|
|
level--;
|
|
chandle = phandle;
|
|
acpi_get_parent(phandle, &phandle);
|
|
if (parent->parent)
|
|
parent = parent->parent;
|
|
continue;
|
|
}
|
|
|
|
status = acpi_get_type(chandle, &type);
|
|
if (ACPI_FAILURE(status))
|
|
continue;
|
|
|
|
/*
|
|
* If this is a scope object then parse it (depth-first).
|
|
*/
|
|
if (type == ACPI_TYPE_LOCAL_SCOPE) {
|
|
level++;
|
|
phandle = chandle;
|
|
chandle = NULL;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We're only interested in objects that we consider 'devices'.
|
|
*/
|
|
switch (type) {
|
|
case ACPI_TYPE_DEVICE:
|
|
type = ACPI_BUS_TYPE_DEVICE;
|
|
break;
|
|
case ACPI_TYPE_PROCESSOR:
|
|
type = ACPI_BUS_TYPE_PROCESSOR;
|
|
break;
|
|
case ACPI_TYPE_THERMAL:
|
|
type = ACPI_BUS_TYPE_THERMAL;
|
|
break;
|
|
case ACPI_TYPE_POWER:
|
|
type = ACPI_BUS_TYPE_POWER;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
if (ops->acpi_op_add)
|
|
status = acpi_add_single_object(&child, parent,
|
|
chandle, type);
|
|
else
|
|
status = acpi_bus_get_device(chandle, &child);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
continue;
|
|
|
|
if (ops->acpi_op_start) {
|
|
status = acpi_start_single_object(child);
|
|
if (ACPI_FAILURE(status))
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* If the device is present, enabled, and functioning then
|
|
* parse its scope (depth-first). Note that we need to
|
|
* represent absent devices to facilitate PnP notifications
|
|
* -- but only the subtree head (not all of its children,
|
|
* which will be enumerated when the parent is inserted).
|
|
*
|
|
* TBD: Need notifications and other detection mechanisms
|
|
* in place before we can fully implement this.
|
|
*/
|
|
if (child->status.present) {
|
|
status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
|
|
NULL, NULL);
|
|
if (ACPI_SUCCESS(status)) {
|
|
level++;
|
|
phandle = chandle;
|
|
chandle = NULL;
|
|
parent = child;
|
|
}
|
|
}
|
|
}
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
int
|
|
acpi_bus_add (
|
|
struct acpi_device **child,
|
|
struct acpi_device *parent,
|
|
acpi_handle handle,
|
|
int type)
|
|
{
|
|
int result;
|
|
struct acpi_bus_ops ops;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_add");
|
|
|
|
result = acpi_add_single_object(child, parent, handle, type);
|
|
if (!result) {
|
|
memset(&ops, 0, sizeof(ops));
|
|
ops.acpi_op_add = 1;
|
|
result = acpi_bus_scan(*child, &ops);
|
|
}
|
|
return_VALUE(result);
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_add);
|
|
|
|
int
|
|
acpi_bus_start (
|
|
struct acpi_device *device)
|
|
{
|
|
int result;
|
|
struct acpi_bus_ops ops;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_start");
|
|
|
|
if (!device)
|
|
return_VALUE(-EINVAL);
|
|
|
|
result = acpi_start_single_object(device);
|
|
if (!result) {
|
|
memset(&ops, 0, sizeof(ops));
|
|
ops.acpi_op_start = 1;
|
|
result = acpi_bus_scan(device, &ops);
|
|
}
|
|
return_VALUE(result);
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_start);
|
|
|
|
static int
|
|
acpi_bus_trim(struct acpi_device *start,
|
|
int rmdevice)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_device *parent, *child;
|
|
acpi_handle phandle, chandle;
|
|
acpi_object_type type;
|
|
u32 level = 1;
|
|
int err = 0;
|
|
|
|
parent = start;
|
|
phandle = start->handle;
|
|
child = chandle = NULL;
|
|
|
|
while ((level > 0) && parent && (!err)) {
|
|
status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
|
|
chandle, &chandle);
|
|
|
|
/*
|
|
* If this scope is exhausted then move our way back up.
|
|
*/
|
|
if (ACPI_FAILURE(status)) {
|
|
level--;
|
|
chandle = phandle;
|
|
acpi_get_parent(phandle, &phandle);
|
|
child = parent;
|
|
parent = parent->parent;
|
|
|
|
if (level == 0)
|
|
err = acpi_bus_remove(child, rmdevice);
|
|
else
|
|
err = acpi_bus_remove(child, 1);
|
|
|
|
continue;
|
|
}
|
|
|
|
status = acpi_get_type(chandle, &type);
|
|
if (ACPI_FAILURE(status)) {
|
|
continue;
|
|
}
|
|
/*
|
|
* If there is a device corresponding to chandle then
|
|
* parse it (depth-first).
|
|
*/
|
|
if (acpi_bus_get_device(chandle, &child) == 0) {
|
|
level++;
|
|
phandle = chandle;
|
|
chandle = NULL;
|
|
parent = child;
|
|
}
|
|
continue;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
acpi_bus_scan_fixed (
|
|
struct acpi_device *root)
|
|
{
|
|
int result = 0;
|
|
struct acpi_device *device = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed");
|
|
|
|
if (!root)
|
|
return_VALUE(-ENODEV);
|
|
|
|
/*
|
|
* Enumerate all fixed-feature devices.
|
|
*/
|
|
if (acpi_fadt.pwr_button == 0) {
|
|
result = acpi_add_single_object(&device, acpi_root,
|
|
NULL, ACPI_BUS_TYPE_POWER_BUTTON);
|
|
if (!result)
|
|
result = acpi_start_single_object(device);
|
|
}
|
|
|
|
if (acpi_fadt.sleep_button == 0) {
|
|
result = acpi_add_single_object(&device, acpi_root,
|
|
NULL, ACPI_BUS_TYPE_SLEEP_BUTTON);
|
|
if (!result)
|
|
result = acpi_start_single_object(device);
|
|
}
|
|
|
|
return_VALUE(result);
|
|
}
|
|
|
|
|
|
static int __init acpi_scan_init(void)
|
|
{
|
|
int result;
|
|
struct acpi_bus_ops ops;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_scan_init");
|
|
|
|
if (acpi_disabled)
|
|
return_VALUE(0);
|
|
|
|
kset_register(&acpi_namespace_kset);
|
|
|
|
/*
|
|
* Create the root device in the bus's device tree
|
|
*/
|
|
result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
|
|
ACPI_BUS_TYPE_SYSTEM);
|
|
if (result)
|
|
goto Done;
|
|
|
|
result = acpi_start_single_object(acpi_root);
|
|
|
|
/*
|
|
* Enumerate devices in the ACPI namespace.
|
|
*/
|
|
result = acpi_bus_scan_fixed(acpi_root);
|
|
if (!result) {
|
|
memset(&ops, 0, sizeof(ops));
|
|
ops.acpi_op_add = 1;
|
|
ops.acpi_op_start = 1;
|
|
result = acpi_bus_scan(acpi_root, &ops);
|
|
}
|
|
|
|
if (result)
|
|
acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
|
|
|
|
Done:
|
|
return_VALUE(result);
|
|
}
|
|
|
|
subsys_initcall(acpi_scan_init);
|