qdev: add a interface to register subclasses
[qemu.git] / hw / qdev.h
1 #ifndef QDEV_H
2 #define QDEV_H
3
4 #include "hw.h"
5 #include "qemu-queue.h"
6 #include "qemu-char.h"
7 #include "qemu-option.h"
8 #include "qapi/qapi-visit-core.h"
9 #include "qemu/object.h"
10
11 typedef struct Property Property;
12
13 typedef struct PropertyInfo PropertyInfo;
14
15 typedef struct CompatProperty CompatProperty;
16
17 typedef struct DeviceInfo DeviceInfo;
18
19 typedef struct BusState BusState;
20
21 typedef struct BusInfo BusInfo;
22
23 enum DevState {
24 DEV_STATE_CREATED = 1,
25 DEV_STATE_INITIALIZED,
26 };
27
28 enum {
29 DEV_NVECTORS_UNSPECIFIED = -1,
30 };
31
32 /**
33 * @DevicePropertyAccessor - called when trying to get/set a property
34 *
35 * @dev the device that owns the property
36 * @v the visitor that contains the property data
37 * @opaque the device property opaque
38 * @name the name of the property
39 * @errp a pointer to an Error that is filled if getting/setting fails.
40 */
41 typedef void (DevicePropertyAccessor)(DeviceState *dev,
42 Visitor *v,
43 void *opaque,
44 const char *name,
45 Error **errp);
46
47 /**
48 * @DevicePropertyRelease - called when a property is removed from a device
49 *
50 * @dev the device that owns the property
51 * @name the name of the property
52 * @opaque the opaque registered with the property
53 */
54 typedef void (DevicePropertyRelease)(DeviceState *dev,
55 const char *name,
56 void *opaque);
57
58 typedef struct DeviceProperty
59 {
60 gchar *name;
61 gchar *type;
62 DevicePropertyAccessor *get;
63 DevicePropertyAccessor *set;
64 DevicePropertyRelease *release;
65 void *opaque;
66
67 QTAILQ_ENTRY(DeviceProperty) node;
68 } DeviceProperty;
69
70 #define TYPE_DEVICE "device"
71 #define DEVICE(obj) OBJECT_CHECK(DeviceState, (obj), TYPE_DEVICE)
72 #define DEVICE_CLASS(klass) OBJECT_CLASS_CHECK(DeviceClass, (klass), TYPE_DEVICE)
73 #define DEVICE_GET_CLASS(obj) OBJECT_GET_CLASS(DeviceClass, (obj), TYPE_DEVICE)
74
75 typedef struct DeviceClass {
76 ObjectClass parent_class;
77 DeviceInfo *info;
78 void (*reset)(DeviceState *dev);
79 } DeviceClass;
80
81 /* This structure should not be accessed directly. We declare it here
82 so that it can be embedded in individual device state structures. */
83 struct DeviceState {
84 Object parent_obj;
85
86 const char *id;
87 enum DevState state;
88 QemuOpts *opts;
89 int hotplugged;
90 BusState *parent_bus;
91 int num_gpio_out;
92 qemu_irq *gpio_out;
93 int num_gpio_in;
94 qemu_irq *gpio_in;
95 QLIST_HEAD(, BusState) child_bus;
96 int num_child_bus;
97 QTAILQ_ENTRY(DeviceState) sibling;
98 int instance_id_alias;
99 int alias_required_for_version;
100
101 /**
102 * This tracks the number of references between devices. See @qdev_ref for
103 * more information.
104 */
105 uint32_t ref;
106
107 QTAILQ_HEAD(, DeviceProperty) properties;
108
109 /* Do not, under any circumstance, use this parent link below anywhere
110 * outside of qdev.c. You have been warned. */
111 DeviceState *parent;
112 };
113
114 typedef void (*bus_dev_printfn)(Monitor *mon, DeviceState *dev, int indent);
115 typedef char *(*bus_get_dev_path)(DeviceState *dev);
116 /*
117 * This callback is used to create Open Firmware device path in accordance with
118 * OF spec http://forthworks.com/standards/of1275.pdf. Indicidual bus bindings
119 * can be found here http://playground.sun.com/1275/bindings/.
120 */
121 typedef char *(*bus_get_fw_dev_path)(DeviceState *dev);
122 typedef int (qbus_resetfn)(BusState *bus);
123
124 struct BusInfo {
125 const char *name;
126 size_t size;
127 bus_dev_printfn print_dev;
128 bus_get_dev_path get_dev_path;
129 bus_get_fw_dev_path get_fw_dev_path;
130 qbus_resetfn *reset;
131 Property *props;
132 };
133
134 struct BusState {
135 DeviceState *parent;
136 BusInfo *info;
137 const char *name;
138 int allow_hotplug;
139 int qdev_allocated;
140 QTAILQ_HEAD(ChildrenHead, DeviceState) children;
141 QLIST_ENTRY(BusState) sibling;
142 };
143
144 struct Property {
145 const char *name;
146 PropertyInfo *info;
147 int offset;
148 int bitnr;
149 void *defval;
150 };
151
152 enum PropertyType {
153 PROP_TYPE_UNSPEC = 0,
154 PROP_TYPE_UINT8,
155 PROP_TYPE_UINT16,
156 PROP_TYPE_UINT32,
157 PROP_TYPE_INT32,
158 PROP_TYPE_UINT64,
159 PROP_TYPE_TADDR,
160 PROP_TYPE_MACADDR,
161 PROP_TYPE_DRIVE,
162 PROP_TYPE_CHR,
163 PROP_TYPE_STRING,
164 PROP_TYPE_NETDEV,
165 PROP_TYPE_VLAN,
166 PROP_TYPE_PTR,
167 PROP_TYPE_BIT,
168 };
169
170 struct PropertyInfo {
171 const char *name;
172 const char *legacy_name;
173 size_t size;
174 enum PropertyType type;
175 int64_t min;
176 int64_t max;
177 int (*parse)(DeviceState *dev, Property *prop, const char *str);
178 int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
179 void (*free)(DeviceState *dev, Property *prop);
180 DevicePropertyAccessor *get;
181 DevicePropertyAccessor *set;
182 };
183
184 typedef struct GlobalProperty {
185 const char *driver;
186 const char *property;
187 const char *value;
188 QTAILQ_ENTRY(GlobalProperty) next;
189 } GlobalProperty;
190
191 /*** Board API. This should go away once we have a machine config file. ***/
192
193 DeviceState *qdev_create(BusState *bus, const char *name);
194 DeviceState *qdev_try_create(BusState *bus, const char *name);
195 bool qdev_exists(const char *name);
196 int qdev_device_help(QemuOpts *opts);
197 DeviceState *qdev_device_add(QemuOpts *opts);
198 int qdev_init(DeviceState *dev) QEMU_WARN_UNUSED_RESULT;
199 void qdev_init_nofail(DeviceState *dev);
200 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
201 int required_for_version);
202 int qdev_unplug(DeviceState *dev);
203 void qdev_free(DeviceState *dev);
204 int qdev_simple_unplug_cb(DeviceState *dev);
205 void qdev_machine_creation_done(void);
206 bool qdev_machine_modified(void);
207
208 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
209 void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
210
211 BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
212
213 /*** Device API. ***/
214
215 typedef int (*qdev_initfn)(DeviceState *dev, DeviceInfo *info);
216 typedef int (*qdev_event)(DeviceState *dev);
217 typedef void (*qdev_resetfn)(DeviceState *dev);
218
219 struct DeviceInfo {
220 const char *name;
221 const char *fw_name;
222 const char *alias;
223 const char *desc;
224 size_t size;
225 Property *props;
226 int no_user;
227
228 /* callbacks */
229 qdev_resetfn reset;
230
231 /* device state */
232 const VMStateDescription *vmsd;
233
234 /* Private to qdev / bus. */
235 qdev_initfn init;
236 qdev_event unplug;
237 qdev_event exit;
238 BusInfo *bus_info;
239 struct DeviceInfo *next;
240 };
241 extern DeviceInfo *device_info_list;
242
243 void qdev_register(DeviceInfo *info);
244 void qdev_register_subclass(DeviceInfo *info, const char *parent);
245
246 /* Register device properties. */
247 /* GPIO inputs also double as IRQ sinks. */
248 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
249 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
250
251 CharDriverState *qdev_init_chardev(DeviceState *dev);
252
253 BusState *qdev_get_parent_bus(DeviceState *dev);
254
255 /*** BUS API. ***/
256
257 DeviceState *qdev_find_recursive(BusState *bus, const char *id);
258
259 /* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
260 typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
261 typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
262
263 void qbus_create_inplace(BusState *bus, BusInfo *info,
264 DeviceState *parent, const char *name);
265 BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name);
266 /* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
267 * < 0 if either devfn or busfn terminate walk somewhere in cursion,
268 * 0 otherwise. */
269 int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
270 qbus_walkerfn *busfn, void *opaque);
271 int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
272 qbus_walkerfn *busfn, void *opaque);
273 void qdev_reset_all(DeviceState *dev);
274 void qbus_reset_all_fn(void *opaque);
275
276 void qbus_free(BusState *bus);
277
278 #define FROM_QBUS(type, dev) DO_UPCAST(type, qbus, dev)
279
280 /* This should go away once we get rid of the NULL bus hack */
281 BusState *sysbus_get_default(void);
282
283 /*** monitor commands ***/
284
285 void do_info_qtree(Monitor *mon);
286 void do_info_qdm(Monitor *mon);
287 int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data);
288 int do_device_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
289
290 /*** qdev-properties.c ***/
291
292 extern PropertyInfo qdev_prop_bit;
293 extern PropertyInfo qdev_prop_uint8;
294 extern PropertyInfo qdev_prop_uint16;
295 extern PropertyInfo qdev_prop_uint32;
296 extern PropertyInfo qdev_prop_int32;
297 extern PropertyInfo qdev_prop_uint64;
298 extern PropertyInfo qdev_prop_hex8;
299 extern PropertyInfo qdev_prop_hex32;
300 extern PropertyInfo qdev_prop_hex64;
301 extern PropertyInfo qdev_prop_string;
302 extern PropertyInfo qdev_prop_chr;
303 extern PropertyInfo qdev_prop_ptr;
304 extern PropertyInfo qdev_prop_macaddr;
305 extern PropertyInfo qdev_prop_drive;
306 extern PropertyInfo qdev_prop_netdev;
307 extern PropertyInfo qdev_prop_vlan;
308 extern PropertyInfo qdev_prop_pci_devfn;
309
310 #define DEFINE_PROP(_name, _state, _field, _prop, _type) { \
311 .name = (_name), \
312 .info = &(_prop), \
313 .offset = offsetof(_state, _field) \
314 + type_check(_type,typeof_field(_state, _field)), \
315 }
316 #define DEFINE_PROP_DEFAULT(_name, _state, _field, _defval, _prop, _type) { \
317 .name = (_name), \
318 .info = &(_prop), \
319 .offset = offsetof(_state, _field) \
320 + type_check(_type,typeof_field(_state, _field)), \
321 .defval = (_type[]) { _defval }, \
322 }
323 #define DEFINE_PROP_BIT(_name, _state, _field, _bit, _defval) { \
324 .name = (_name), \
325 .info = &(qdev_prop_bit), \
326 .bitnr = (_bit), \
327 .offset = offsetof(_state, _field) \
328 + type_check(uint32_t,typeof_field(_state, _field)), \
329 .defval = (bool[]) { (_defval) }, \
330 }
331
332 #define DEFINE_PROP_UINT8(_n, _s, _f, _d) \
333 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint8, uint8_t)
334 #define DEFINE_PROP_UINT16(_n, _s, _f, _d) \
335 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint16, uint16_t)
336 #define DEFINE_PROP_UINT32(_n, _s, _f, _d) \
337 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint32, uint32_t)
338 #define DEFINE_PROP_INT32(_n, _s, _f, _d) \
339 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_int32, int32_t)
340 #define DEFINE_PROP_UINT64(_n, _s, _f, _d) \
341 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint64, uint64_t)
342 #define DEFINE_PROP_HEX8(_n, _s, _f, _d) \
343 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex8, uint8_t)
344 #define DEFINE_PROP_HEX32(_n, _s, _f, _d) \
345 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex32, uint32_t)
346 #define DEFINE_PROP_HEX64(_n, _s, _f, _d) \
347 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex64, uint64_t)
348 #define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d) \
349 DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_pci_devfn, uint32_t)
350
351 #define DEFINE_PROP_PTR(_n, _s, _f) \
352 DEFINE_PROP(_n, _s, _f, qdev_prop_ptr, void*)
353 #define DEFINE_PROP_CHR(_n, _s, _f) \
354 DEFINE_PROP(_n, _s, _f, qdev_prop_chr, CharDriverState*)
355 #define DEFINE_PROP_STRING(_n, _s, _f) \
356 DEFINE_PROP(_n, _s, _f, qdev_prop_string, char*)
357 #define DEFINE_PROP_NETDEV(_n, _s, _f) \
358 DEFINE_PROP(_n, _s, _f, qdev_prop_netdev, VLANClientState*)
359 #define DEFINE_PROP_VLAN(_n, _s, _f) \
360 DEFINE_PROP(_n, _s, _f, qdev_prop_vlan, VLANState*)
361 #define DEFINE_PROP_DRIVE(_n, _s, _f) \
362 DEFINE_PROP(_n, _s, _f, qdev_prop_drive, BlockDriverState *)
363 #define DEFINE_PROP_MACADDR(_n, _s, _f) \
364 DEFINE_PROP(_n, _s, _f, qdev_prop_macaddr, MACAddr)
365
366 #define DEFINE_PROP_END_OF_LIST() \
367 {}
368
369 /* Set properties between creation and init. */
370 void *qdev_get_prop_ptr(DeviceState *dev, Property *prop);
371 int qdev_prop_exists(DeviceState *dev, const char *name);
372 int qdev_prop_parse(DeviceState *dev, const char *name, const char *value);
373 void qdev_prop_set(DeviceState *dev, const char *name, void *src, enum PropertyType type);
374 void qdev_prop_set_bit(DeviceState *dev, const char *name, bool value);
375 void qdev_prop_set_uint8(DeviceState *dev, const char *name, uint8_t value);
376 void qdev_prop_set_uint16(DeviceState *dev, const char *name, uint16_t value);
377 void qdev_prop_set_uint32(DeviceState *dev, const char *name, uint32_t value);
378 void qdev_prop_set_int32(DeviceState *dev, const char *name, int32_t value);
379 void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value);
380 void qdev_prop_set_string(DeviceState *dev, const char *name, char *value);
381 void qdev_prop_set_chr(DeviceState *dev, const char *name, CharDriverState *value);
382 void qdev_prop_set_netdev(DeviceState *dev, const char *name, VLANClientState *value);
383 void qdev_prop_set_vlan(DeviceState *dev, const char *name, VLANState *value);
384 int qdev_prop_set_drive(DeviceState *dev, const char *name, BlockDriverState *value) QEMU_WARN_UNUSED_RESULT;
385 void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name, BlockDriverState *value);
386 void qdev_prop_set_macaddr(DeviceState *dev, const char *name, uint8_t *value);
387 /* FIXME: Remove opaque pointer properties. */
388 void qdev_prop_set_ptr(DeviceState *dev, const char *name, void *value);
389 void qdev_prop_set_defaults(DeviceState *dev, Property *props);
390
391 void qdev_prop_register_global_list(GlobalProperty *props);
392 void qdev_prop_set_globals(DeviceState *dev);
393 void error_set_from_qdev_prop_error(Error **errp, int ret, DeviceState *dev,
394 Property *prop, const char *value);
395
396 DeviceInfo *qdev_get_info(DeviceState *dev);
397
398 static inline const char *qdev_fw_name(DeviceState *dev)
399 {
400 DeviceInfo *info = qdev_get_info(dev);
401
402 if (info->fw_name) {
403 return info->fw_name;
404 } else if (info->alias) {
405 return info->alias;
406 }
407
408 return object_get_typename(OBJECT(dev));
409 }
410
411 char *qdev_get_fw_dev_path(DeviceState *dev);
412 /* This is a nasty hack to allow passing a NULL bus to qdev_create. */
413 extern struct BusInfo system_bus_info;
414
415 /**
416 * @qdev_ref
417 *
418 * Increase the reference count of a device. A device cannot be freed as long
419 * as its reference count is greater than zero.
420 *
421 * @dev - the device
422 */
423 void qdev_ref(DeviceState *dev);
424
425 /**
426 * @qdef_unref
427 *
428 * Decrease the reference count of a device. A device cannot be freed as long
429 * as its reference count is greater than zero.
430 *
431 * @dev - the device
432 */
433 void qdev_unref(DeviceState *dev);
434
435 /**
436 * @qdev_property_add - add a new property to a device
437 *
438 * @dev - the device to add a property to
439 *
440 * @name - the name of the property. This can contain any character except for
441 * a forward slash. In general, you should use hyphens '-' instead of
442 * underscores '_' when naming properties.
443 *
444 * @type - the type name of the property. This namespace is pretty loosely
445 * defined. Sub namespaces are constructed by using a prefix and then
446 * to angle brackets. For instance, the type 'virtio-net-pci' in the
447 * 'link' namespace would be 'link<virtio-net-pci>'.
448 *
449 * @get - the getter to be called to read a property. If this is NULL, then
450 * the property cannot be read.
451 *
452 * @set - the setter to be called to write a property. If this is NULL,
453 * then the property cannot be written.
454 *
455 * @release - called when the property is removed from the device. This is
456 * meant to allow a property to free its opaque upon device
457 * destruction. This may be NULL.
458 *
459 * @opaque - an opaque pointer to pass to the callbacks for the property
460 *
461 * @errp - returns an error if this function fails
462 */
463 void qdev_property_add(DeviceState *dev, const char *name, const char *type,
464 DevicePropertyAccessor *get, DevicePropertyAccessor *set,
465 DevicePropertyRelease *release,
466 void *opaque, Error **errp);
467
468 /**
469 * @qdev_property_get - reads a property from a device
470 *
471 * @dev - the device
472 *
473 * @v - the visitor that will receive the property value. This should be an
474 * Output visitor and the data will be written with @name as the name.
475 *
476 * @name - the name of the property
477 *
478 * @errp - returns an error if this function fails
479 */
480 void qdev_property_get(DeviceState *dev, Visitor *v, const char *name,
481 Error **errp);
482
483 /**
484 * @qdev_property_set - writes a property to a device
485 *
486 * @dev - the device
487 *
488 * @v - the visitor that will be used to write the property value. This should
489 * be an Input visitor and the data will be first read with @name as the
490 * name and then written as the property value.
491 *
492 * @name - the name of the property
493 *
494 * @errp - returns an error if this function fails
495 */
496 void qdev_property_set(DeviceState *dev, Visitor *v, const char *name,
497 Error **errp);
498
499 /**
500 * @qdev_property_get_type - returns the type of a property
501 *
502 * @dev - the device
503 *
504 * @name - the name of the property
505 *
506 * @errp - returns an error if this function fails
507 *
508 * Returns:
509 * The type name of the property.
510 */
511 const char *qdev_property_get_type(DeviceState *dev, const char *name,
512 Error **errp);
513
514 /**
515 * @qdev_property_add_static - add a @Property to a device referencing a
516 * field in a struct.
517 */
518 void qdev_property_add_static(DeviceState *dev, Property *prop, Error **errp);
519
520 /**
521 * @qdev_get_root - returns the root device of the composition tree
522 *
523 * Returns:
524 * The root of the composition tree.
525 */
526 DeviceState *qdev_get_root(void);
527
528 /**
529 * @qdev_get_canonical_path - returns the canonical path for a device. This
530 * is the path within the composition tree starting from the root.
531 *
532 * Returns:
533 * The canonical path in the composition tree.
534 */
535 gchar *qdev_get_canonical_path(DeviceState *dev);
536
537 /**
538 * @qdev_resolve_path - resolves a path returning a device
539 *
540 * There are two types of supported paths--absolute paths and partial paths.
541 *
542 * Absolute paths are derived from the root device and can follow child<> or
543 * link<> properties. Since they can follow link<> properties, they can be
544 * arbitrarily long. Absolute paths look like absolute filenames and are
545 * prefixed with a leading slash.
546 *
547 * Partial paths look like relative filenames. They do not begin with a
548 * prefix. The matching rules for partial paths are subtle but designed to make
549 * specifying devices easy. At each level of the composition tree, the partial
550 * path is matched as an absolute path. The first match is not returned. At
551 * least two matches are searched for. A successful result is only returned if
552 * only one match is founded. If more than one match is found, a flag is
553 * return to indicate that the match was ambiguous.
554 *
555 * @path - the path to resolve
556 *
557 * @ambiguous - returns true if the path resolution failed because of an
558 * ambiguous match
559 *
560 * Returns:
561 * The matched device or NULL on path lookup failure.
562 */
563 DeviceState *qdev_resolve_path(const char *path, bool *ambiguous);
564
565 /**
566 * @qdev_property_add_child - Add a child property to a device
567 *
568 * Child properties form the composition tree. All devices need to be a child
569 * of another device. Devices can only be a child of one device.
570 *
571 * There is no way for a child to determine what its parent is. It is not
572 * a bidirectional relationship. This is by design.
573 *
574 * @dev - the device to add a property to
575 *
576 * @name - the name of the property
577 *
578 * @child - the child device
579 *
580 * @errp - if an error occurs, a pointer to an area to store the area
581 */
582 void qdev_property_add_child(DeviceState *dev, const char *name,
583 DeviceState *child, Error **errp);
584
585 /**
586 * @qdev_property_add_link - Add a link property to a device
587 *
588 * Links establish relationships between devices. Links are unidirectional
589 * although two links can be combined to form a bidirectional relationship
590 * between devices.
591 *
592 * Links form the graph in the device model.
593 *
594 * @dev - the device to add a property to
595 *
596 * @name - the name of the property
597 *
598 * @type - the qdev type of the link
599 *
600 * @child - a pointer to where the link device reference is stored
601 *
602 * @errp - if an error occurs, a pointer to an area to store the area
603 */
604 void qdev_property_add_link(DeviceState *dev, const char *name,
605 const char *type, DeviceState **child,
606 Error **errp);
607
608 /**
609 * @qdev_property_add_str
610 *
611 * Add a string property using getters/setters. This function will add a
612 * property of type 'string'.
613 *
614 * @dev - the device to add a property to
615 *
616 * @name - the name of the property
617 *
618 * @get - the getter or NULL if the property is write-only. This function must
619 * return a string to be freed by @g_free().
620 *
621 * @set - the setter or NULL if the property is read-only
622 *
623 * @errp - if an error occurs, a pointer to an area to store the error
624 */
625 void qdev_property_add_str(DeviceState *dev, const char *name,
626 char *(*get)(DeviceState *, Error **),
627 void (*set)(DeviceState *, const char *, Error **),
628 Error **errp);
629
630 /**
631 * @qdev_get_type
632 *
633 * Returns the string representation of the type of this object.
634 *
635 * @dev - the device
636 *
637 * @errp - if an error occurs, a pointer to an area to store the error
638 *
639 * Returns: a string representing the type. This must be freed by the caller
640 * with g_free().
641 */
642 char *qdev_get_type(DeviceState *dev, Error **errp);
643
644 /**
645 * @qdev_machine_init
646 *
647 * Initialize platform devices before machine init. This is a hack until full
648 * support for composition is added.
649 */
650 void qdev_machine_init(void);
651
652 /**
653 * @device_reset
654 *
655 * Reset a single device (by calling the reset method).
656 */
657 void device_reset(DeviceState *dev);
658
659 #endif