diff options
Diffstat (limited to 'drivers/acpi/scan.c')
| -rw-r--r-- | drivers/acpi/scan.c | 1613 |
1 files changed, 1613 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c new file mode 100644 index 00000000..85cbfdcc --- /dev/null +++ b/drivers/acpi/scan.c @@ -0,0 +1,1613 @@ +/* + * scan.c - support for transforming the ACPI namespace into individual objects + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/acpi.h> +#include <linux/signal.h> +#include <linux/kthread.h> +#include <linux/dmi.h> + +#include <acpi/acpi_drivers.h> + +#include "internal.h" + +#define _COMPONENT ACPI_BUS_COMPONENT +ACPI_MODULE_NAME("scan"); +#define STRUCT_TO_INT(s) (*((int*)&s)) +extern struct acpi_device *acpi_root; + +#define ACPI_BUS_CLASS "system_bus" +#define ACPI_BUS_HID "LNXSYBUS" +#define ACPI_BUS_DEVICE_NAME "System Bus" + +#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) + +static const char *dummy_hid = "device"; + +static LIST_HEAD(acpi_device_list); +static LIST_HEAD(acpi_bus_id_list); +DEFINE_MUTEX(acpi_device_lock); +LIST_HEAD(acpi_wakeup_device_list); + +struct acpi_device_bus_id{ + char bus_id[15]; + unsigned int instance_no; + struct list_head node; +}; + +/* + * Creates hid/cid(s) string needed for modalias and uevent + * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: + * char *modalias: "acpi:IBM0001:ACPI0001" +*/ +static int create_modalias(struct acpi_device *acpi_dev, char *modalias, + int size) +{ + int len; + int count; + struct acpi_hardware_id *id; + + if (list_empty(&acpi_dev->pnp.ids)) + return 0; + + len = snprintf(modalias, size, "acpi:"); + size -= len; + + list_for_each_entry(id, &acpi_dev->pnp.ids, list) { + count = snprintf(&modalias[len], size, "%s:", id->id); + if (count < 0 || count >= size) + return -EINVAL; + len += count; + size -= count; + } + + modalias[len] = '\0'; + return len; +} + +static ssize_t +acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { + struct acpi_device *acpi_dev = to_acpi_device(dev); + int len; + + /* Device has no HID and no CID or string is >1024 */ + len = create_modalias(acpi_dev, buf, 1024); + if (len <= 0) + return 0; + buf[len++] = '\n'; + return len; +} +static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); + +static void acpi_bus_hot_remove_device(void *context) +{ + struct acpi_device *device; + acpi_handle handle = context; + struct acpi_object_list arg_list; + union acpi_object arg; + acpi_status status = AE_OK; + + if (acpi_bus_get_device(handle, &device)) + return; + + if (!device) + return; + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Hot-removing device %s...\n", dev_name(&device->dev))); + + if (acpi_bus_trim(device, 1)) { + printk(KERN_ERR PREFIX + "Removing device failed\n"); + return; + } + + /* power off device */ + status = acpi_evaluate_object(handle, "_PS3", NULL, NULL); + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) + printk(KERN_WARNING PREFIX + "Power-off device failed\n"); + + if (device->flags.lockable) { + arg_list.count = 1; + arg_list.pointer = &arg; + arg.type = ACPI_TYPE_INTEGER; + arg.integer.value = 0; + acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); + } + + arg_list.count = 1; + arg_list.pointer = &arg; + arg.type = ACPI_TYPE_INTEGER; + arg.integer.value = 1; + + /* + * TBD: _EJD support. + */ + status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); + if (ACPI_FAILURE(status)) + printk(KERN_WARNING PREFIX + "Eject device failed\n"); + + return; +} + +static ssize_t +acpi_eject_store(struct device *d, struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret = count; + acpi_status status; + acpi_object_type type = 0; + struct acpi_device *acpi_device = to_acpi_device(d); + + if ((!count) || (buf[0] != '1')) { + return -EINVAL; + } +#ifndef FORCE_EJECT + if (acpi_device->driver == NULL) { + ret = -ENODEV; + goto err; + } +#endif + status = acpi_get_type(acpi_device->handle, &type); + if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) { + ret = -ENODEV; + goto err; + } + + acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle); +err: + return ret; +} + +static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); + +static ssize_t +acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { + struct acpi_device *acpi_dev = to_acpi_device(dev); + + return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); +} +static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); + +static ssize_t +acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; + int result; + + result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); + if (result) + goto end; + + result = sprintf(buf, "%s\n", (char*)path.pointer); + kfree(path.pointer); +end: + return result; +} +static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); + +static int acpi_device_setup_files(struct acpi_device *dev) +{ + acpi_status status; + acpi_handle temp; + int result = 0; + + /* + * Devices gotten from FADT don't have a "path" attribute + */ + if (dev->handle) { + result = device_create_file(&dev->dev, &dev_attr_path); + if (result) + goto end; + } + + if (!list_empty(&dev->pnp.ids)) { + result = device_create_file(&dev->dev, &dev_attr_hid); + if (result) + goto end; + + result = device_create_file(&dev->dev, &dev_attr_modalias); + if (result) + goto end; + } + + /* + * If device has _EJ0, 'eject' file is created that is used to trigger + * hot-removal function from userland. + */ + status = acpi_get_handle(dev->handle, "_EJ0", &temp); + if (ACPI_SUCCESS(status)) + result = device_create_file(&dev->dev, &dev_attr_eject); +end: + return result; +} + +static void acpi_device_remove_files(struct acpi_device *dev) +{ + acpi_status status; + acpi_handle temp; + + /* + * If device has _EJ0, 'eject' file is created that is used to trigger + * hot-removal function from userland. + */ + status = acpi_get_handle(dev->handle, "_EJ0", &temp); + if (ACPI_SUCCESS(status)) + device_remove_file(&dev->dev, &dev_attr_eject); + + device_remove_file(&dev->dev, &dev_attr_modalias); + device_remove_file(&dev->dev, &dev_attr_hid); + if (dev->handle) + device_remove_file(&dev->dev, &dev_attr_path); +} +/* -------------------------------------------------------------------------- + ACPI Bus operations + -------------------------------------------------------------------------- */ + +int acpi_match_device_ids(struct acpi_device *device, + const struct acpi_device_id *ids) +{ + const struct acpi_device_id *id; + struct acpi_hardware_id *hwid; + + /* + * If the device is not present, it is unnecessary to load device + * driver for it. + */ + if (!device->status.present) + return -ENODEV; + + for (id = ids; id->id[0]; id++) + list_for_each_entry(hwid, &device->pnp.ids, list) + if (!strcmp((char *) id->id, hwid->id)) + return 0; + + return -ENOENT; +} +EXPORT_SYMBOL(acpi_match_device_ids); + +static void acpi_free_ids(struct acpi_device *device) +{ + struct acpi_hardware_id *id, *tmp; + + list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) { + kfree(id->id); + kfree(id); + } +} + +static void acpi_device_release(struct device *dev) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + + acpi_free_ids(acpi_dev); + kfree(acpi_dev); +} + +static int acpi_device_suspend(struct device *dev, pm_message_t state) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_driver *acpi_drv = acpi_dev->driver; + + if (acpi_drv && acpi_drv->ops.suspend) + return acpi_drv->ops.suspend(acpi_dev, state); + return 0; +} + +static int acpi_device_resume(struct device *dev) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_driver *acpi_drv = acpi_dev->driver; + + if (acpi_drv && acpi_drv->ops.resume) + return acpi_drv->ops.resume(acpi_dev); + return 0; +} + +static int acpi_bus_match(struct device *dev, struct device_driver *drv) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_driver *acpi_drv = to_acpi_driver(drv); + + return !acpi_match_device_ids(acpi_dev, acpi_drv->ids); +} + +static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + int len; + + if (list_empty(&acpi_dev->pnp.ids)) + return 0; + + if (add_uevent_var(env, "MODALIAS=")) + return -ENOMEM; + len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], + sizeof(env->buf) - env->buflen); + if (len >= (sizeof(env->buf) - env->buflen)) + return -ENOMEM; + env->buflen += len; + return 0; +} + +static void acpi_device_notify(acpi_handle handle, u32 event, void *data) +{ + struct acpi_device *device = data; + + device->driver->ops.notify(device, event); +} + +static acpi_status acpi_device_notify_fixed(void *data) +{ + struct acpi_device *device = data; + + /* Fixed hardware devices have no handles */ + acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); + return AE_OK; +} + +static int acpi_device_install_notify_handler(struct acpi_device *device) +{ + acpi_status status; + + if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) + status = + acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, + acpi_device_notify_fixed, + device); + else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) + status = + acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, + acpi_device_notify_fixed, + device); + else + status = acpi_install_notify_handler(device->handle, + ACPI_DEVICE_NOTIFY, + acpi_device_notify, + device); + + if (ACPI_FAILURE(status)) + return -EINVAL; + return 0; +} + +static void acpi_device_remove_notify_handler(struct acpi_device *device) +{ + if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) + acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, + acpi_device_notify_fixed); + else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) + acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, + acpi_device_notify_fixed); + else + acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, + acpi_device_notify); +} + +static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *); +static int acpi_start_single_object(struct acpi_device *); +static int acpi_device_probe(struct device * dev) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); + int ret; + + ret = acpi_bus_driver_init(acpi_dev, acpi_drv); + if (!ret) { + if (acpi_dev->bus_ops.acpi_op_start) + acpi_start_single_object(acpi_dev); + + if (acpi_drv->ops.notify) { + ret = acpi_device_install_notify_handler(acpi_dev); + if (ret) { + if (acpi_drv->ops.remove) + acpi_drv->ops.remove(acpi_dev, + acpi_dev->removal_type); + return ret; + } + } + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Found driver [%s] for device [%s]\n", + acpi_drv->name, acpi_dev->pnp.bus_id)); + get_device(dev); + } + return ret; +} + +static int acpi_device_remove(struct device * dev) +{ + struct acpi_device *acpi_dev = to_acpi_device(dev); + struct acpi_driver *acpi_drv = acpi_dev->driver; + + if (acpi_drv) { + if (acpi_drv->ops.notify) + acpi_device_remove_notify_handler(acpi_dev); + if (acpi_drv->ops.remove) + acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type); + } + acpi_dev->driver = NULL; + acpi_dev->driver_data = NULL; + + put_device(dev); + return 0; +} + +struct bus_type acpi_bus_type = { + .name = "acpi", + .suspend = acpi_device_suspend, + .resume = acpi_device_resume, + .match = acpi_bus_match, + .probe = acpi_device_probe, + .remove = acpi_device_remove, + .uevent = acpi_device_uevent, +}; + +static int acpi_device_register(struct acpi_device *device) +{ + int result; + struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; + int found = 0; + + /* + * Linkage + * ------- + * Link this device to its parent and siblings. + */ + INIT_LIST_HEAD(&device->children); + INIT_LIST_HEAD(&device->node); + INIT_LIST_HEAD(&device->wakeup_list); + + new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); + if (!new_bus_id) { + printk(KERN_ERR PREFIX "Memory allocation error\n"); + return -ENOMEM; + } + + mutex_lock(&acpi_device_lock); + /* + * Find suitable bus_id and instance number in acpi_bus_id_list + * If failed, create one and link it into acpi_bus_id_list + */ + list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { + if (!strcmp(acpi_device_bus_id->bus_id, + acpi_device_hid(device))) { + acpi_device_bus_id->instance_no++; + found = 1; + kfree(new_bus_id); + break; + } + } + if (!found) { + acpi_device_bus_id = new_bus_id; + strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); + acpi_device_bus_id->instance_no = 0; + list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); + } + dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); + + if (device->parent) + list_add_tail(&device->node, &device->parent->children); + + if (device->wakeup.flags.valid) + list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); + mutex_unlock(&acpi_device_lock); + + if (device->parent) + device->dev.parent = &device->parent->dev; + device->dev.bus = &acpi_bus_type; + device->dev.release = &acpi_device_release; + result = device_register(&device->dev); + if (result) { + dev_err(&device->dev, "Error registering device\n"); + goto end; + } + + result = acpi_device_setup_files(device); + if (result) + printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", + dev_name(&device->dev)); + + device->removal_type = ACPI_BUS_REMOVAL_NORMAL; + return 0; +end: + mutex_lock(&acpi_device_lock); + if (device->parent) + list_del(&device->node); + list_del(&device->wakeup_list); + mutex_unlock(&acpi_device_lock); + return result; +} + +static void acpi_device_unregister(struct acpi_device *device, int type) +{ + mutex_lock(&acpi_device_lock); + if (device->parent) + list_del(&device->node); + + list_del(&device->wakeup_list); + mutex_unlock(&acpi_device_lock); + + acpi_detach_data(device->handle, acpi_bus_data_handler); + + acpi_device_remove_files(device); + device_unregister(&device->dev); +} + +/* -------------------------------------------------------------------------- + Driver Management + -------------------------------------------------------------------------- */ +/** + * acpi_bus_driver_init - add a device to a driver + * @device: the device to add and initialize + * @driver: driver for the device + * + * Used to initialize a device via its device driver. Called whenever a + * driver is bound to a device. Invokes the driver's add() ops. + */ +static int +acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) +{ + int result = 0; + + if (!device || !driver) + return -EINVAL; + + if (!driver->ops.add) + return -ENOSYS; + + result = driver->ops.add(device); + if (result) { + device->driver = NULL; + device->driver_data = NULL; + return result; + } + + device->driver = driver; + + /* + * TBD - Configuration Management: Assign resources to device based + * upon possible configuration and currently allocated resources. + */ + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Driver successfully bound to device\n")); + return 0; +} + +static int acpi_start_single_object(struct acpi_device *device) +{ + int result = 0; + struct acpi_driver *driver; + + + if (!(driver = device->driver)) + return 0; + + if (driver->ops.start) { + result = driver->ops.start(device); + if (result && driver->ops.remove) + driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); + } + + return result; +} + +/** + * acpi_bus_register_driver - register a driver with the ACPI bus + * @driver: driver being registered + * + * Registers a driver with the ACPI bus. Searches the namespace for all + * devices that match the driver's criteria and binds. Returns zero for + * success or a negative error status for failure. + */ +int acpi_bus_register_driver(struct acpi_driver *driver) +{ + int ret; + + if (acpi_disabled) + return -ENODEV; + driver->drv.name = driver->name; + driver->drv.bus = &acpi_bus_type; + driver->drv.owner = driver->owner; + + ret = driver_register(&driver->drv); + return ret; +} + +EXPORT_SYMBOL(acpi_bus_register_driver); + +/** + * acpi_bus_unregister_driver - unregisters a driver with the APIC bus + * @driver: driver to unregister + * + * Unregisters a driver with the ACPI bus. Searches the namespace for all + * devices that match the driver's criteria and unbinds. + */ +void acpi_bus_unregister_driver(struct acpi_driver *driver) +{ + driver_unregister(&driver->drv); +} + +EXPORT_SYMBOL(acpi_bus_unregister_driver); + +/* -------------------------------------------------------------------------- + Device Enumeration + -------------------------------------------------------------------------- */ +static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) +{ + acpi_status status; + int ret; + struct acpi_device *device; + + /* + * Fixed hardware devices do not appear in the namespace and do not + * have handles, but we fabricate acpi_devices for them, so we have + * to deal with them specially. + */ + if (handle == NULL) + return acpi_root; + + do { + status = acpi_get_parent(handle, &handle); + if (status == AE_NULL_ENTRY) + return NULL; + if (ACPI_FAILURE(status)) + return acpi_root; + + ret = acpi_bus_get_device(handle, &device); + if (ret == 0) + return device; + } while (1); +} + +acpi_status +acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) +{ + acpi_status status; + acpi_handle tmp; + struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; + union acpi_object *obj; + + status = acpi_get_handle(handle, "_EJD", &tmp); + if (ACPI_FAILURE(status)) + return status; + + status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); + if (ACPI_SUCCESS(status)) { + obj = buffer.pointer; + status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, + ejd); + kfree(buffer.pointer); + } + return status; +} +EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); + +void acpi_bus_data_handler(acpi_handle handle, void *context) +{ + + /* TBD */ + + return; +} + +static int acpi_bus_get_perf_flags(struct acpi_device *device) +{ + device->performance.state = ACPI_STATE_UNKNOWN; + return 0; +} + +static acpi_status +acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, + struct acpi_device_wakeup *wakeup) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *package = NULL; + union acpi_object *element = NULL; + acpi_status status; + int i = 0; + + if (!wakeup) + return AE_BAD_PARAMETER; + + /* _PRW */ + status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); + return status; + } + + package = (union acpi_object *)buffer.pointer; + + if (!package || (package->package.count < 2)) { + status = AE_BAD_DATA; + goto out; + } + + element = &(package->package.elements[0]); + if (!element) { + status = AE_BAD_DATA; + goto out; + } + if (element->type == ACPI_TYPE_PACKAGE) { + if ((element->package.count < 2) || + (element->package.elements[0].type != + ACPI_TYPE_LOCAL_REFERENCE) + || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) { + status = AE_BAD_DATA; + goto out; + } + wakeup->gpe_device = + element->package.elements[0].reference.handle; + wakeup->gpe_number = + (u32) element->package.elements[1].integer.value; + } else if (element->type == ACPI_TYPE_INTEGER) { + wakeup->gpe_device = NULL; + wakeup->gpe_number = element->integer.value; + } else { + status = AE_BAD_DATA; + goto out; + } + + element = &(package->package.elements[1]); + if (element->type != ACPI_TYPE_INTEGER) { + status = AE_BAD_DATA; + goto out; + } + wakeup->sleep_state = element->integer.value; + + if ((package->package.count - 2) > ACPI_MAX_HANDLES) { + status = AE_NO_MEMORY; + goto out; + } + wakeup->resources.count = package->package.count - 2; + for (i = 0; i < wakeup->resources.count; i++) { + element = &(package->package.elements[i + 2]); + if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { + status = AE_BAD_DATA; + goto out; + } + + wakeup->resources.handles[i] = element->reference.handle; + } + + acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); + + out: + kfree(buffer.pointer); + + return status; +} + +static void acpi_bus_set_run_wake_flags(struct acpi_device *device) +{ + struct acpi_device_id button_device_ids[] = { + {"PNP0C0D", 0}, + {"PNP0C0C", 0}, + {"PNP0C0E", 0}, + {"", 0}, + }; + acpi_status status; + acpi_event_status event_status; + + device->wakeup.flags.notifier_present = 0; + + /* Power button, Lid switch always enable wakeup */ + if (!acpi_match_device_ids(device, button_device_ids)) { + device->wakeup.flags.run_wake = 1; + device_set_wakeup_capable(&device->dev, true); + return; + } + + status = acpi_get_gpe_status(device->wakeup.gpe_device, + device->wakeup.gpe_number, + &event_status); + if (status == AE_OK) + device->wakeup.flags.run_wake = + !!(event_status & ACPI_EVENT_FLAG_HANDLE); +} + +static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) +{ + acpi_handle temp; + acpi_status status = 0; + int psw_error; + + /* Presence of _PRW indicates wake capable */ + status = acpi_get_handle(device->handle, "_PRW", &temp); + if (ACPI_FAILURE(status)) + return; + + status = acpi_bus_extract_wakeup_device_power_package(device->handle, + &device->wakeup); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); + return; + } + + device->wakeup.flags.valid = 1; + device->wakeup.prepare_count = 0; + acpi_bus_set_run_wake_flags(device); + /* Call _PSW/_DSW object to disable its ability to wake the sleeping + * system for the ACPI device with the _PRW object. + * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. + * So it is necessary to call _DSW object first. Only when it is not + * present will the _PSW object used. + */ + psw_error = acpi_device_sleep_wake(device, 0, 0, 0); + if (psw_error) + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "error in _DSW or _PSW evaluation\n")); +} + +static void acpi_bus_add_power_resource(acpi_handle handle); + +static int acpi_bus_get_power_flags(struct acpi_device *device) +{ + acpi_status status = 0; + acpi_handle handle = NULL; + u32 i = 0; + + + /* + * Power Management Flags + */ + status = acpi_get_handle(device->handle, "_PSC", &handle); + if (ACPI_SUCCESS(status)) + device->power.flags.explicit_get = 1; + status = acpi_get_handle(device->handle, "_IRC", &handle); + if (ACPI_SUCCESS(status)) + device->power.flags.inrush_current = 1; + + /* + * Enumerate supported power management states + */ + for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; 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) { + int j; + + device->power.flags.power_resources = 1; + for (j = 0; j < ps->resources.count; j++) + acpi_bus_add_power_resource(ps->resources.handles[j]); + } + + /* 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; + + /* + * State is valid if there are means to put the device into it. + * D3hot is only valid if _PR3 present. + */ + if (ps->resources.count || + (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) + 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; + + /* Set D3cold's explicit_set flag if _PS3 exists. */ + if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) + device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; + + acpi_bus_init_power(device); + + return 0; +} + +static int acpi_bus_get_flags(struct acpi_device *device) +{ + acpi_status status = AE_OK; + acpi_handle temp = NULL; + + + /* Presence of _STA indicates 'dynamic_status' */ + status = acpi_get_handle(device->handle, "_STA", &temp); + if (ACPI_SUCCESS(status)) + device->flags.dynamic_status = 1; + + /* Presence of _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; + + /* Power resources cannot be power manageable. */ + if (device->device_type == ACPI_BUS_TYPE_POWER) + return 0; + + /* 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: Performance management */ + + return 0; +} + +static void acpi_device_get_busid(struct acpi_device *device) +{ + char bus_id[5] = { '?', 0 }; + struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; + int i = 0; + + /* + * Bus ID + * ------ + * The device's Bus ID is simply the object name. + * TBD: Shouldn't this value be unique (within the ACPI namespace)? + */ + if (ACPI_IS_ROOT_DEVICE(device)) { + strcpy(device->pnp.bus_id, "ACPI"); + return; + } + + switch (device->device_type) { + case ACPI_BUS_TYPE_POWER_BUTTON: + strcpy(device->pnp.bus_id, "PWRF"); + break; + case ACPI_BUS_TYPE_SLEEP_BUTTON: + strcpy(device->pnp.bus_id, "SLPF"); + break; + default: + acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); + /* Clean up trailing underscores (if any) */ + for (i = 3; i > 1; i--) { + if (bus_id[i] == '_') + bus_id[i] = '\0'; + else + break; + } + strcpy(device->pnp.bus_id, bus_id); + break; + } +} + +/* + * acpi_bay_match - see if a device is an ejectable driver bay + * + * If an acpi object is ejectable and has one of the ACPI ATA methods defined, + * then we can safely call it an ejectable drive bay + */ +static int acpi_bay_match(struct acpi_device *device){ + acpi_status status; + acpi_handle handle; + acpi_handle tmp; + acpi_handle phandle; + + handle = device->handle; + + status = acpi_get_handle(handle, "_EJ0", &tmp); + if (ACPI_FAILURE(status)) + return -ENODEV; + + if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || + (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || + (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || + (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) + return 0; + + if (acpi_get_parent(handle, &phandle)) + return -ENODEV; + + if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) || + (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) || + (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) || + (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp)))) + return 0; + + return -ENODEV; +} + +/* + * acpi_dock_match - see if a device has a _DCK method + */ +static int acpi_dock_match(struct acpi_device *device) +{ + acpi_handle tmp; + return acpi_get_handle(device->handle, "_DCK", &tmp); +} + +const char *acpi_device_hid(struct acpi_device *device) +{ + struct acpi_hardware_id *hid; + + if (list_empty(&device->pnp.ids)) + return dummy_hid; + + hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); + return hid->id; +} +EXPORT_SYMBOL(acpi_device_hid); + +static void acpi_add_id(struct acpi_device *device, const char *dev_id) +{ + struct acpi_hardware_id *id; + + id = kmalloc(sizeof(*id), GFP_KERNEL); + if (!id) + return; + + id->id = kstrdup(dev_id, GFP_KERNEL); + if (!id->id) { + kfree(id); + return; + } + + list_add_tail(&id->list, &device->pnp.ids); +} + +/* + * Old IBM workstations have a DSDT bug wherein the SMBus object + * lacks the SMBUS01 HID and the methods do not have the necessary "_" + * prefix. Work around this. + */ +static int acpi_ibm_smbus_match(struct acpi_device *device) +{ + acpi_handle h_dummy; + struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; + int result; + + if (!dmi_name_in_vendors("IBM")) + return -ENODEV; + + /* Look for SMBS object */ + result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path); + if (result) + return result; + + if (strcmp("SMBS", path.pointer)) { + result = -ENODEV; + goto out; + } + + /* Does it have the necessary (but misnamed) methods? */ + result = -ENODEV; + if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) && + ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) && + ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy))) + result = 0; +out: + kfree(path.pointer); + return result; +} + +static void acpi_device_set_id(struct acpi_device *device) +{ + acpi_status status; + struct acpi_device_info *info; + struct acpica_device_id_list *cid_list; + int i; + + switch (device->device_type) { + case ACPI_BUS_TYPE_DEVICE: + if (ACPI_IS_ROOT_DEVICE(device)) { + acpi_add_id(device, ACPI_SYSTEM_HID); + break; + } + + status = acpi_get_object_info(device->handle, &info); + if (ACPI_FAILURE(status)) { + printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__); + return; + } + + if (info->valid & ACPI_VALID_HID) + acpi_add_id(device, info->hardware_id.string); + if (info->valid & ACPI_VALID_CID) { + cid_list = &info->compatible_id_list; + for (i = 0; i < cid_list->count; i++) + acpi_add_id(device, cid_list->ids[i].string); + } + if (info->valid & ACPI_VALID_ADR) { + device->pnp.bus_address = info->address; + device->flags.bus_address = 1; + } + + kfree(info); + + /* + * Some devices don't reliably have _HIDs & _CIDs, so add + * synthetic HIDs to make sure drivers can find them. + */ + if (acpi_is_video_device(device)) + acpi_add_id(device, ACPI_VIDEO_HID); + else if (ACPI_SUCCESS(acpi_bay_match(device))) + acpi_add_id(device, ACPI_BAY_HID); + else if (ACPI_SUCCESS(acpi_dock_match(device))) + acpi_add_id(device, ACPI_DOCK_HID); + else if (!acpi_ibm_smbus_match(device)) + acpi_add_id(device, ACPI_SMBUS_IBM_HID); + else if (!acpi_device_hid(device) && + ACPI_IS_ROOT_DEVICE(device->parent)) { + acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ + strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); + strcpy(device->pnp.device_class, ACPI_BUS_CLASS); + } + + break; + case ACPI_BUS_TYPE_POWER: + acpi_add_id(device, ACPI_POWER_HID); + break; + case ACPI_BUS_TYPE_PROCESSOR: + acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID); + break; + case ACPI_BUS_TYPE_THERMAL: + acpi_add_id(device, ACPI_THERMAL_HID); + break; + case ACPI_BUS_TYPE_POWER_BUTTON: + acpi_add_id(device, ACPI_BUTTON_HID_POWERF); + break; + case ACPI_BUS_TYPE_SLEEP_BUTTON: + acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF); + break; + } +} + +static int acpi_device_set_context(struct acpi_device *device) +{ + acpi_status status; + + /* + * Context + * ------- + * Attach this 'struct acpi_device' to the ACPI object. This makes + * resolutions from handle->device very efficient. Fixed hardware + * devices have no handles, so we skip them. + */ + if (!device->handle) + return 0; + + status = acpi_attach_data(device->handle, + acpi_bus_data_handler, device); + if (ACPI_SUCCESS(status)) + return 0; + + printk(KERN_ERR PREFIX "Error attaching device data\n"); + return -ENODEV; +} + +static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) +{ + if (!dev) + return -EINVAL; + + dev->removal_type = ACPI_BUS_REMOVAL_EJECT; + device_release_driver(&dev->dev); + + if (!rmdevice) + return 0; + + /* + * unbind _ADR-Based Devices when hot removal + */ + if (dev->flags.bus_address) { + if ((dev->parent) && (dev->parent->ops.unbind)) + dev->parent->ops.unbind(dev); + } + acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); + + return 0; +} + +static int acpi_add_single_object(struct acpi_device **child, + acpi_handle handle, int type, + unsigned long long sta, + struct acpi_bus_ops *ops) +{ + int result; + struct acpi_device *device; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + + device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); + if (!device) { + printk(KERN_ERR PREFIX "Memory allocation error\n"); + return -ENOMEM; + } + + INIT_LIST_HEAD(&device->pnp.ids); + device->device_type = type; + device->handle = handle; + device->parent = acpi_bus_get_parent(handle); + device->bus_ops = *ops; /* workround for not call .start */ + STRUCT_TO_INT(device->status) = sta; + + acpi_device_get_busid(device); + + /* + * Flags + * ----- + * 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; + + /* + * Initialize Device + * ----------------- + * TBD: Synch with Core's enumeration/initialization process. + */ + acpi_device_set_id(device); + + /* + * Power Management + * ---------------- + */ + if (device->flags.power_manageable) { + result = acpi_bus_get_power_flags(device); + if (result) + goto end; + } + + /* + * Wakeup device management + *----------------------- + */ + acpi_bus_get_wakeup_device_flags(device); + + /* + * 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))) + goto end; + + result = acpi_device_register(device); + + /* + * Bind _ADR-Based Devices when hot add + */ + if (device->flags.bus_address) { + if (device->parent && device->parent->ops.bind) + device->parent->ops.bind(device); + } + +end: + if (!result) { + acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Adding %s [%s] parent %s\n", dev_name(&device->dev), + (char *) buffer.pointer, + device->parent ? dev_name(&device->parent->dev) : + "(null)")); + kfree(buffer.pointer); + *child = device; + } else + acpi_device_release(&device->dev); + + return result; +} + +#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \ + ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING) + +static void acpi_bus_add_power_resource(acpi_handle handle) +{ + struct acpi_bus_ops ops = { + .acpi_op_add = 1, + .acpi_op_start = 1, + }; + struct acpi_device *device = NULL; + + acpi_bus_get_device(handle, &device); + if (!device) + acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER, + ACPI_STA_DEFAULT, &ops); +} + +static int acpi_bus_type_and_status(acpi_handle handle, int *type, + unsigned long long *sta) +{ + acpi_status status; + acpi_object_type acpi_type; + + status = acpi_get_type(handle, &acpi_type); + if (ACPI_FAILURE(status)) + return -ENODEV; + + switch (acpi_type) { + case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ + case ACPI_TYPE_DEVICE: + *type = ACPI_BUS_TYPE_DEVICE; + status = acpi_bus_get_status_handle(handle, sta); + if (ACPI_FAILURE(status)) + return -ENODEV; + break; + case ACPI_TYPE_PROCESSOR: + *type = ACPI_BUS_TYPE_PROCESSOR; + status = acpi_bus_get_status_handle(handle, sta); + if (ACPI_FAILURE(status)) + return -ENODEV; + break; + case ACPI_TYPE_THERMAL: + *type = ACPI_BUS_TYPE_THERMAL; + *sta = ACPI_STA_DEFAULT; + break; + case ACPI_TYPE_POWER: + *type = ACPI_BUS_TYPE_POWER; + *sta = ACPI_STA_DEFAULT; + break; + default: + return -ENODEV; + } + + return 0; +} + +static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl, + void *context, void **return_value) +{ + struct acpi_bus_ops *ops = context; + int type; + unsigned long long sta; + struct acpi_device *device; + acpi_status status; + int result; + + result = acpi_bus_type_and_status(handle, &type, &sta); + if (result) + return AE_OK; + + if (!(sta & ACPI_STA_DEVICE_PRESENT) && + !(sta & ACPI_STA_DEVICE_FUNCTIONING)) { + struct acpi_device_wakeup wakeup; + acpi_handle temp; + + status = acpi_get_handle(handle, "_PRW", &temp); + if (ACPI_SUCCESS(status)) + acpi_bus_extract_wakeup_device_power_package(handle, + &wakeup); + return AE_CTRL_DEPTH; + } + + /* + * We may already have an acpi_device from a previous enumeration. If + * so, we needn't add it again, but we may still have to start it. + */ + device = NULL; + acpi_bus_get_device(handle, &device); + if (ops->acpi_op_add && !device) + acpi_add_single_object(&device, handle, type, sta, ops); + + if (!device) + return AE_CTRL_DEPTH; + + if (ops->acpi_op_start && !(ops->acpi_op_add)) { + status = acpi_start_single_object(device); + if (ACPI_FAILURE(status)) + return AE_CTRL_DEPTH; + } + + if (!*return_value) + *return_value = device; + return AE_OK; +} + +static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops, + struct acpi_device **child) +{ + acpi_status status; + void *device = NULL; + + status = acpi_bus_check_add(handle, 0, ops, &device); + if (ACPI_SUCCESS(status)) + acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, + acpi_bus_check_add, NULL, ops, &device); + + if (child) + *child = device; + + if (device) + return 0; + else + return -ENODEV; +} + +/* + * acpi_bus_add and acpi_bus_start + * + * scan a given ACPI tree and (probably recently hot-plugged) + * create and add or starts found devices. + * + * If no devices were found -ENODEV is returned which does not + * mean that this is a real error, there just have been no suitable + * ACPI objects in the table trunk from which the kernel could create + * a device and add/start an appropriate driver. + */ + +int +acpi_bus_add(struct acpi_device **child, + struct acpi_device *parent, acpi_handle handle, int type) +{ + struct acpi_bus_ops ops; + + memset(&ops, 0, sizeof(ops)); + ops.acpi_op_add = 1; + + return acpi_bus_scan(handle, &ops, child); +} +EXPORT_SYMBOL(acpi_bus_add); + +int acpi_bus_start(struct acpi_device *device) +{ + struct acpi_bus_ops ops; + int result; + + if (!device) + return -EINVAL; + + memset(&ops, 0, sizeof(ops)); + ops.acpi_op_start = 1; + + result = acpi_bus_scan(device->handle, &ops, NULL); + + acpi_update_all_gpes(); + + return result; +} +EXPORT_SYMBOL(acpi_bus_start); + +int acpi_bus_trim(struct acpi_device *start, int rmdevice) +{ + acpi_status status; + struct acpi_device *parent, *child; + acpi_handle phandle, chandle; + acpi_object_type type; + u32 level = 1; + int err = 0; + + parent = start; + phandle = start->handle; + child = chandle = NULL; + + while ((level > 0) && parent && (!err)) { + status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, + chandle, &chandle); + + /* + * If this scope is exhausted then move our way back up. + */ + if (ACPI_FAILURE(status)) { + level--; + chandle = phandle; + acpi_get_parent(phandle, &phandle); + child = parent; + parent = parent->parent; + + if (level == 0) + err = acpi_bus_remove(child, rmdevice); + else + err = acpi_bus_remove(child, 1); + + continue; + } + + status = acpi_get_type(chandle, &type); + if (ACPI_FAILURE(status)) { + continue; + } + /* + * If there is a device corresponding to chandle then + * parse it (depth-first). + */ + if (acpi_bus_get_device(chandle, &child) == 0) { + level++; + phandle = chandle; + chandle = NULL; + parent = child; + } + continue; + } + return err; +} +EXPORT_SYMBOL_GPL(acpi_bus_trim); + +static int acpi_bus_scan_fixed(void) +{ + int result = 0; + struct acpi_device *device = NULL; + struct acpi_bus_ops ops; + + memset(&ops, 0, sizeof(ops)); + ops.acpi_op_add = 1; + ops.acpi_op_start = 1; + + /* + * Enumerate all fixed-feature devices. + */ + if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) { + result = acpi_add_single_object(&device, NULL, + ACPI_BUS_TYPE_POWER_BUTTON, + ACPI_STA_DEFAULT, + &ops); + } + + if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { + result = acpi_add_single_object(&device, NULL, + ACPI_BUS_TYPE_SLEEP_BUTTON, + ACPI_STA_DEFAULT, + &ops); + } + + return result; +} + +int __init acpi_scan_init(void) +{ + int result; + struct acpi_bus_ops ops; + + memset(&ops, 0, sizeof(ops)); + ops.acpi_op_add = 1; + ops.acpi_op_start = 1; + + result = bus_register(&acpi_bus_type); + if (result) { + /* We don't want to quit even if we failed to add suspend/resume */ + printk(KERN_ERR PREFIX "Could not register bus type\n"); + } + + acpi_power_init(); + + /* + * Enumerate devices in the ACPI namespace. + */ + result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root); + + if (!result) + result = acpi_bus_scan_fixed(); + + if (result) + acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); + else + acpi_update_all_gpes(); + + return result; +} |