1 | /* |
2 | * This work is licensed under the terms of the GNU GPL, version 2 or |
3 | * (at your option) any later version. See the COPYING file in the |
4 | * top-level directory. |
5 | */ |
6 | |
7 | #include "qemu/osdep.h" |
8 | #include "qapi/error.h" |
9 | #include "qemu/iov.h" |
10 | #include "qemu/module.h" |
11 | #include "trace.h" |
12 | |
13 | #include "hw/virtio/virtio.h" |
14 | #include "hw/qdev-properties.h" |
15 | #include "hw/virtio/virtio-input.h" |
16 | |
17 | #include "standard-headers/linux/input.h" |
18 | |
19 | #define VIRTIO_INPUT_VM_VERSION 1 |
20 | |
21 | /* ----------------------------------------------------------------- */ |
22 | |
23 | void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event) |
24 | { |
25 | VirtQueueElement *elem; |
26 | int i, len; |
27 | |
28 | if (!vinput->active) { |
29 | return; |
30 | } |
31 | |
32 | /* queue up events ... */ |
33 | if (vinput->qindex == vinput->qsize) { |
34 | vinput->qsize++; |
35 | vinput->queue = g_realloc(vinput->queue, vinput->qsize * |
36 | sizeof(vinput->queue[0])); |
37 | } |
38 | vinput->queue[vinput->qindex++].event = *event; |
39 | |
40 | /* ... until we see a report sync ... */ |
41 | if (event->type != cpu_to_le16(EV_SYN) || |
42 | event->code != cpu_to_le16(SYN_REPORT)) { |
43 | return; |
44 | } |
45 | |
46 | /* ... then check available space ... */ |
47 | for (i = 0; i < vinput->qindex; i++) { |
48 | elem = virtqueue_pop(vinput->evt, sizeof(VirtQueueElement)); |
49 | if (!elem) { |
50 | while (--i >= 0) { |
51 | virtqueue_unpop(vinput->evt, vinput->queue[i].elem, 0); |
52 | } |
53 | vinput->qindex = 0; |
54 | trace_virtio_input_queue_full(); |
55 | return; |
56 | } |
57 | vinput->queue[i].elem = elem; |
58 | } |
59 | |
60 | /* ... and finally pass them to the guest */ |
61 | for (i = 0; i < vinput->qindex; i++) { |
62 | elem = vinput->queue[i].elem; |
63 | len = iov_from_buf(elem->in_sg, elem->in_num, |
64 | 0, &vinput->queue[i].event, sizeof(virtio_input_event)); |
65 | virtqueue_push(vinput->evt, elem, len); |
66 | g_free(elem); |
67 | } |
68 | virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt); |
69 | vinput->qindex = 0; |
70 | } |
71 | |
72 | static void virtio_input_handle_evt(VirtIODevice *vdev, VirtQueue *vq) |
73 | { |
74 | /* nothing */ |
75 | } |
76 | |
77 | static void virtio_input_handle_sts(VirtIODevice *vdev, VirtQueue *vq) |
78 | { |
79 | VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); |
80 | VirtIOInput *vinput = VIRTIO_INPUT(vdev); |
81 | virtio_input_event event; |
82 | VirtQueueElement *elem; |
83 | int len; |
84 | |
85 | for (;;) { |
86 | elem = virtqueue_pop(vinput->sts, sizeof(VirtQueueElement)); |
87 | if (!elem) { |
88 | break; |
89 | } |
90 | |
91 | memset(&event, 0, sizeof(event)); |
92 | len = iov_to_buf(elem->out_sg, elem->out_num, |
93 | 0, &event, sizeof(event)); |
94 | if (vic->handle_status) { |
95 | vic->handle_status(vinput, &event); |
96 | } |
97 | virtqueue_push(vinput->sts, elem, len); |
98 | g_free(elem); |
99 | } |
100 | virtio_notify(vdev, vinput->sts); |
101 | } |
102 | |
103 | virtio_input_config *virtio_input_find_config(VirtIOInput *vinput, |
104 | uint8_t select, |
105 | uint8_t subsel) |
106 | { |
107 | VirtIOInputConfig *cfg; |
108 | |
109 | QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) { |
110 | if (select == cfg->config.select && |
111 | subsel == cfg->config.subsel) { |
112 | return &cfg->config; |
113 | } |
114 | } |
115 | return NULL; |
116 | } |
117 | |
118 | void virtio_input_add_config(VirtIOInput *vinput, |
119 | virtio_input_config *config) |
120 | { |
121 | VirtIOInputConfig *cfg; |
122 | |
123 | if (virtio_input_find_config(vinput, config->select, config->subsel)) { |
124 | /* should not happen */ |
125 | fprintf(stderr, "%s: duplicate config: %d/%d\n" , |
126 | __func__, config->select, config->subsel); |
127 | abort(); |
128 | } |
129 | |
130 | cfg = g_new0(VirtIOInputConfig, 1); |
131 | cfg->config = *config; |
132 | QTAILQ_INSERT_TAIL(&vinput->cfg_list, cfg, node); |
133 | } |
134 | |
135 | void virtio_input_init_config(VirtIOInput *vinput, |
136 | virtio_input_config *config) |
137 | { |
138 | int i = 0; |
139 | |
140 | QTAILQ_INIT(&vinput->cfg_list); |
141 | while (config[i].select) { |
142 | virtio_input_add_config(vinput, config + i); |
143 | i++; |
144 | } |
145 | } |
146 | |
147 | void virtio_input_idstr_config(VirtIOInput *vinput, |
148 | uint8_t select, const char *string) |
149 | { |
150 | virtio_input_config id; |
151 | |
152 | if (!string) { |
153 | return; |
154 | } |
155 | memset(&id, 0, sizeof(id)); |
156 | id.select = select; |
157 | id.size = snprintf(id.u.string, sizeof(id.u.string), "%s" , string); |
158 | virtio_input_add_config(vinput, &id); |
159 | } |
160 | |
161 | static void virtio_input_get_config(VirtIODevice *vdev, uint8_t *config_data) |
162 | { |
163 | VirtIOInput *vinput = VIRTIO_INPUT(vdev); |
164 | virtio_input_config *config; |
165 | |
166 | config = virtio_input_find_config(vinput, vinput->cfg_select, |
167 | vinput->cfg_subsel); |
168 | if (config) { |
169 | memcpy(config_data, config, vinput->cfg_size); |
170 | } else { |
171 | memset(config_data, 0, vinput->cfg_size); |
172 | } |
173 | } |
174 | |
175 | static void virtio_input_set_config(VirtIODevice *vdev, |
176 | const uint8_t *config_data) |
177 | { |
178 | VirtIOInput *vinput = VIRTIO_INPUT(vdev); |
179 | virtio_input_config *config = (virtio_input_config *)config_data; |
180 | |
181 | vinput->cfg_select = config->select; |
182 | vinput->cfg_subsel = config->subsel; |
183 | virtio_notify_config(vdev); |
184 | } |
185 | |
186 | static uint64_t virtio_input_get_features(VirtIODevice *vdev, uint64_t f, |
187 | Error **errp) |
188 | { |
189 | return f; |
190 | } |
191 | |
192 | static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val) |
193 | { |
194 | VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); |
195 | VirtIOInput *vinput = VIRTIO_INPUT(vdev); |
196 | |
197 | if (val & VIRTIO_CONFIG_S_DRIVER_OK) { |
198 | if (!vinput->active) { |
199 | vinput->active = true; |
200 | if (vic->change_active) { |
201 | vic->change_active(vinput); |
202 | } |
203 | } |
204 | } |
205 | } |
206 | |
207 | static void virtio_input_reset(VirtIODevice *vdev) |
208 | { |
209 | VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); |
210 | VirtIOInput *vinput = VIRTIO_INPUT(vdev); |
211 | |
212 | if (vinput->active) { |
213 | vinput->active = false; |
214 | if (vic->change_active) { |
215 | vic->change_active(vinput); |
216 | } |
217 | } |
218 | } |
219 | |
220 | static int virtio_input_post_load(void *opaque, int version_id) |
221 | { |
222 | VirtIOInput *vinput = opaque; |
223 | VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vinput); |
224 | VirtIODevice *vdev = VIRTIO_DEVICE(vinput); |
225 | |
226 | vinput->active = vdev->status & VIRTIO_CONFIG_S_DRIVER_OK; |
227 | if (vic->change_active) { |
228 | vic->change_active(vinput); |
229 | } |
230 | return 0; |
231 | } |
232 | |
233 | static void virtio_input_device_realize(DeviceState *dev, Error **errp) |
234 | { |
235 | VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev); |
236 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
237 | VirtIOInput *vinput = VIRTIO_INPUT(dev); |
238 | VirtIOInputConfig *cfg; |
239 | Error *local_err = NULL; |
240 | |
241 | if (vic->realize) { |
242 | vic->realize(dev, &local_err); |
243 | if (local_err) { |
244 | error_propagate(errp, local_err); |
245 | return; |
246 | } |
247 | } |
248 | |
249 | virtio_input_idstr_config(vinput, VIRTIO_INPUT_CFG_ID_SERIAL, |
250 | vinput->serial); |
251 | |
252 | QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) { |
253 | if (vinput->cfg_size < cfg->config.size) { |
254 | vinput->cfg_size = cfg->config.size; |
255 | } |
256 | } |
257 | vinput->cfg_size += 8; |
258 | assert(vinput->cfg_size <= sizeof(virtio_input_config)); |
259 | |
260 | virtio_init(vdev, "virtio-input" , VIRTIO_ID_INPUT, |
261 | vinput->cfg_size); |
262 | vinput->evt = virtio_add_queue(vdev, 64, virtio_input_handle_evt); |
263 | vinput->sts = virtio_add_queue(vdev, 64, virtio_input_handle_sts); |
264 | } |
265 | |
266 | static void virtio_input_finalize(Object *obj) |
267 | { |
268 | VirtIOInput *vinput = VIRTIO_INPUT(obj); |
269 | VirtIOInputConfig *cfg, *next; |
270 | |
271 | QTAILQ_FOREACH_SAFE(cfg, &vinput->cfg_list, node, next) { |
272 | QTAILQ_REMOVE(&vinput->cfg_list, cfg, node); |
273 | g_free(cfg); |
274 | } |
275 | |
276 | g_free(vinput->queue); |
277 | } |
278 | static void virtio_input_device_unrealize(DeviceState *dev, Error **errp) |
279 | { |
280 | VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev); |
281 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
282 | Error *local_err = NULL; |
283 | |
284 | if (vic->unrealize) { |
285 | vic->unrealize(dev, &local_err); |
286 | if (local_err) { |
287 | error_propagate(errp, local_err); |
288 | return; |
289 | } |
290 | } |
291 | virtio_cleanup(vdev); |
292 | } |
293 | |
294 | static const VMStateDescription vmstate_virtio_input = { |
295 | .name = "virtio-input" , |
296 | .minimum_version_id = VIRTIO_INPUT_VM_VERSION, |
297 | .version_id = VIRTIO_INPUT_VM_VERSION, |
298 | .fields = (VMStateField[]) { |
299 | VMSTATE_VIRTIO_DEVICE, |
300 | VMSTATE_END_OF_LIST() |
301 | }, |
302 | .post_load = virtio_input_post_load, |
303 | }; |
304 | |
305 | static Property virtio_input_properties[] = { |
306 | DEFINE_PROP_STRING("serial" , VirtIOInput, serial), |
307 | DEFINE_PROP_END_OF_LIST(), |
308 | }; |
309 | |
310 | static void virtio_input_class_init(ObjectClass *klass, void *data) |
311 | { |
312 | DeviceClass *dc = DEVICE_CLASS(klass); |
313 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
314 | |
315 | dc->props = virtio_input_properties; |
316 | dc->vmsd = &vmstate_virtio_input; |
317 | set_bit(DEVICE_CATEGORY_INPUT, dc->categories); |
318 | vdc->realize = virtio_input_device_realize; |
319 | vdc->unrealize = virtio_input_device_unrealize; |
320 | vdc->get_config = virtio_input_get_config; |
321 | vdc->set_config = virtio_input_set_config; |
322 | vdc->get_features = virtio_input_get_features; |
323 | vdc->set_status = virtio_input_set_status; |
324 | vdc->reset = virtio_input_reset; |
325 | } |
326 | |
327 | static const TypeInfo virtio_input_info = { |
328 | .name = TYPE_VIRTIO_INPUT, |
329 | .parent = TYPE_VIRTIO_DEVICE, |
330 | .instance_size = sizeof(VirtIOInput), |
331 | .class_size = sizeof(VirtIOInputClass), |
332 | .class_init = virtio_input_class_init, |
333 | .abstract = true, |
334 | .instance_finalize = virtio_input_finalize, |
335 | }; |
336 | |
337 | /* ----------------------------------------------------------------- */ |
338 | |
339 | static void virtio_register_types(void) |
340 | { |
341 | type_register_static(&virtio_input_info); |
342 | } |
343 | |
344 | type_init(virtio_register_types) |
345 | |