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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/module.h"
10 #include "qemu/sockets.h"
11
12 #include "hw/virtio/virtio.h"
13 #include "hw/core/qdev-properties.h"
14 #include "hw/virtio/virtio-input.h"
15
16 #include <sys/ioctl.h>
17 #include "standard-headers/linux/input.h"
18
19 /* ----------------------------------------------------------------- */
20
21 static struct virtio_input_config virtio_input_host_config[] = {
22 { /* empty list */ },
23 };
24
25 static void virtio_input_host_event(void *opaque)
26 {
27 VirtIOInputHost *vih = opaque;
28 VirtIOInput *vinput = VIRTIO_INPUT(vih);
29 struct virtio_input_event virtio;
30 struct input_event evdev;
31 int rc;
32
33 for (;;) {
34 rc = read(vih->fd, &evdev, sizeof(evdev));
35 if (rc != sizeof(evdev)) {
36 break;
37 }
38
39 virtio.type = cpu_to_le16(evdev.type);
40 virtio.code = cpu_to_le16(evdev.code);
41 virtio.value = cpu_to_le32(evdev.value);
42 virtio_input_send(vinput, &virtio);
43 }
44 }
45
46 static void virtio_input_bits_config(VirtIOInputHost *vih,
47 int type, int count)
48 {
49 virtio_input_config bits;
50 int rc, i, size = 0;
51
52 memset(&bits, 0, sizeof(bits));
53 rc = ioctl(vih->fd, EVIOCGBIT(type, count/8), bits.u.bitmap);
54 if (rc < 0) {
55 return;
56 }
57
58 for (i = 0; i < count/8; i++) {
59 if (bits.u.bitmap[i]) {
60 size = i+1;
61 }
62 }
63 if (size == 0) {
64 return;
65 }
66
67 bits.select = VIRTIO_INPUT_CFG_EV_BITS;
68 bits.subsel = type;
69 bits.size = size;
70 virtio_input_add_config(VIRTIO_INPUT(vih), &bits);
71 }
72
73 static void virtio_input_abs_config(VirtIOInputHost *vih, int axis)
74 {
75 virtio_input_config config;
76 struct input_absinfo absinfo;
77 int rc;
78
79 rc = ioctl(vih->fd, EVIOCGABS(axis), &absinfo);
80 if (rc < 0) {
81 return;
82 }
83
84 memset(&config, 0, sizeof(config));
85 config.select = VIRTIO_INPUT_CFG_ABS_INFO;
86 config.subsel = axis;
87 config.size = sizeof(virtio_input_absinfo);
88
89 config.u.abs.min = cpu_to_le32(absinfo.minimum);
90 config.u.abs.max = cpu_to_le32(absinfo.maximum);
91 config.u.abs.fuzz = cpu_to_le32(absinfo.fuzz);
92 config.u.abs.flat = cpu_to_le32(absinfo.flat);
93 config.u.abs.res = cpu_to_le32(absinfo.resolution);
94
95 virtio_input_add_config(VIRTIO_INPUT(vih), &config);
96 }
97
98 static void virtio_input_host_realize(DeviceState *dev, Error **errp)
99 {
100 VirtIOInputHost *vih = VIRTIO_INPUT_HOST(dev);
101 VirtIOInput *vinput = VIRTIO_INPUT(dev);
102 virtio_input_config id, *abs;
103 struct input_id ids;
104 int rc, ver, i, axis;
105 uint8_t byte;
106
107 if (!vih->evdev) {
108 error_setg(errp, "evdev property is required");
109 return;
110 }
111
112 vih->fd = open(vih->evdev, O_RDWR);
113 if (vih->fd < 0) {
114 error_setg_file_open(errp, errno, vih->evdev);
115 return;
116 }
117 if (!qemu_set_blocking(vih->fd, false, errp)) {
118 goto err_close;
119 }
120
121 rc = ioctl(vih->fd, EVIOCGVERSION, &ver);
122 if (rc < 0) {
123 error_setg(errp, "%s: is not an evdev device", vih->evdev);
124 goto err_close;
125 }
126
127 rc = ioctl(vih->fd, EVIOCGRAB, 1);
128 if (rc < 0) {
129 error_setg_errno(errp, errno, "%s: failed to get exclusive access",
130 vih->evdev);
131 goto err_close;
132 }
133
134 memset(&id, 0, sizeof(id));
135 ioctl(vih->fd, EVIOCGNAME(sizeof(id.u.string)-1), id.u.string);
136 id.select = VIRTIO_INPUT_CFG_ID_NAME;
137 id.size = strlen(id.u.string);
138 virtio_input_add_config(vinput, &id);
139
140 if (ioctl(vih->fd, EVIOCGID, &ids) == 0) {
141 memset(&id, 0, sizeof(id));
142 id.select = VIRTIO_INPUT_CFG_ID_DEVIDS;
143 id.size = sizeof(struct virtio_input_devids);
144 id.u.ids.bustype = cpu_to_le16(ids.bustype);
145 id.u.ids.vendor = cpu_to_le16(ids.vendor);
146 id.u.ids.product = cpu_to_le16(ids.product);
147 id.u.ids.version = cpu_to_le16(ids.version);
148 virtio_input_add_config(vinput, &id);
149 }
150
151 virtio_input_bits_config(vih, EV_KEY, KEY_CNT);
152 virtio_input_bits_config(vih, EV_REL, REL_CNT);
153 virtio_input_bits_config(vih, EV_ABS, ABS_CNT);
154 virtio_input_bits_config(vih, EV_MSC, MSC_CNT);
155 virtio_input_bits_config(vih, EV_SW, SW_CNT);
156 virtio_input_bits_config(vih, EV_LED, LED_CNT);
157
158 abs = virtio_input_find_config(VIRTIO_INPUT(vih),
159 VIRTIO_INPUT_CFG_EV_BITS, EV_ABS);
160 if (abs) {
161 for (i = 0; i < abs->size; i++) {
162 byte = abs->u.bitmap[i];
163 axis = 8 * i;
164 while (byte) {
165 if (byte & 1) {
166 virtio_input_abs_config(vih, axis);
167 }
168 axis++;
169 byte >>= 1;
170 }
171 }
172 }
173
174 qemu_set_fd_handler(vih->fd, virtio_input_host_event, NULL, vih);
175 return;
176
177 err_close:
178 close(vih->fd);
179 vih->fd = -1;
180 }
181
182 static void virtio_input_host_unrealize(DeviceState *dev)
183 {
184 VirtIOInputHost *vih = VIRTIO_INPUT_HOST(dev);
185
186 if (vih->fd > 0) {
187 qemu_set_fd_handler(vih->fd, NULL, NULL, NULL);
188 close(vih->fd);
189 }
190 }
191
192 static void virtio_input_host_handle_status(VirtIOInput *vinput,
193 virtio_input_event *event)
194 {
195 VirtIOInputHost *vih = VIRTIO_INPUT_HOST(vinput);
196 struct input_event evdev;
197 struct timeval tval;
198 int rc;
199
200 if (gettimeofday(&tval, NULL)) {
201 perror("virtio_input_host_handle_status: gettimeofday");
202 return;
203 }
204
205 evdev.input_event_sec = tval.tv_sec;
206 evdev.input_event_usec = tval.tv_usec;
207 evdev.type = le16_to_cpu(event->type);
208 evdev.code = le16_to_cpu(event->code);
209 evdev.value = le32_to_cpu(event->value);
210
211 rc = write(vih->fd, &evdev, sizeof(evdev));
212 if (rc == -1) {
213 perror("virtio_input_host_handle_status: write");
214 }
215 }
216
217 static const VMStateDescription vmstate_virtio_input_host = {
218 .name = "virtio-input-host",
219 .unmigratable = 1,
220 };
221
222 static const Property virtio_input_host_properties[] = {
223 DEFINE_PROP_STRING("evdev", VirtIOInputHost, evdev),
224 };
225
226 static void virtio_input_host_class_init(ObjectClass *klass, const void *data)
227 {
228 VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
229 DeviceClass *dc = DEVICE_CLASS(klass);
230
231 dc->vmsd = &vmstate_virtio_input_host;
232 device_class_set_props(dc, virtio_input_host_properties);
233 vic->realize = virtio_input_host_realize;
234 vic->unrealize = virtio_input_host_unrealize;
235 vic->handle_status = virtio_input_host_handle_status;
236 }
237
238 static void virtio_input_host_init(Object *obj)
239 {
240 VirtIOInput *vinput = VIRTIO_INPUT(obj);
241
242 virtio_input_init_config(vinput, virtio_input_host_config);
243 }
244
245 static const TypeInfo virtio_input_host_info = {
246 .name = TYPE_VIRTIO_INPUT_HOST,
247 .parent = TYPE_VIRTIO_INPUT,
248 .instance_size = sizeof(VirtIOInputHost),
249 .instance_init = virtio_input_host_init,
250 .class_init = virtio_input_host_class_init,
251 };
252
253 /* ----------------------------------------------------------------- */
254
255 static void virtio_register_types(void)
256 {
257 type_register_static(&virtio_input_host_info);
258 }
259
260 type_init(virtio_register_types)