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
7 #include "qemu/osdep.h"
10 #include <linux/input.h>
13 #include "qemu/bswap.h"
14 #include "qemu/sockets.h"
15 #include "contrib/libvhost-user/libvhost-user.h"
16 #include "contrib/libvhost-user/libvhost-user-glib.h"
17 #include "standard-headers/linux/virtio_input.h"
18 #include "qapi/error.h"
20 typedef struct virtio_input_event virtio_input_event;
21 typedef struct virtio_input_config virtio_input_config;
23 typedef struct VuInput {
28 virtio_input_config *sel_config;
30 virtio_input_event event;
33 uint32_t qindex, qsize;
36 static void vi_input_send(VuInput *vi, struct virtio_input_event *event)
38 VuDev *dev = &vi->dev.parent;
39 VuVirtq *vq = vu_get_queue(dev, 0);
43 /* queue up events ... */
44 if (vi->qindex == vi->qsize) {
46 vi->queue = g_realloc_n(vi->queue, vi->qsize, sizeof(vi->queue[0]));
48 vi->queue[vi->qindex++].event = *event;
50 /* ... until we see a report sync ... */
51 if (event->type != htole16(EV_SYN) ||
52 event->code != htole16(SYN_REPORT)) {
56 /* ... then check available space ... */
57 for (i = 0; i < vi->qindex; i++) {
58 elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
61 vu_queue_unpop(dev, vq, vi->queue[i].elem, 0);
64 g_warning("virtio-input queue full");
67 vi->queue[i].elem = elem;
70 /* ... and finally pass them to the guest */
71 for (i = 0; i < vi->qindex; i++) {
72 elem = vi->queue[i].elem;
73 len = iov_from_buf(elem->in_sg, elem->in_num,
74 0, &vi->queue[i].event, sizeof(virtio_input_event));
75 vu_queue_push(dev, vq, elem, len);
79 vu_queue_notify(&vi->dev.parent, vq);
84 vi_evdev_watch(VuDev *dev, int condition, void *data)
89 g_debug("Got evdev condition %x", condition);
91 struct virtio_input_event virtio;
92 struct input_event evdev;
96 rc = read(fd, &evdev, sizeof(evdev));
97 if (rc != sizeof(evdev)) {
101 g_debug("input %d %d %d", evdev.type, evdev.code, evdev.value);
103 virtio.type = htole16(evdev.type);
104 virtio.code = htole16(evdev.code);
105 virtio.value = htole32(evdev.value);
106 vi_input_send(vi, &virtio);
111 static void vi_handle_status(VuInput *vi, virtio_input_event *event)
113 struct input_event evdev;
116 if (gettimeofday(&evdev.time, NULL)) {
117 perror("vi_handle_status: gettimeofday");
121 evdev.type = le16toh(event->type);
122 evdev.code = le16toh(event->code);
123 evdev.value = le32toh(event->value);
125 rc = write(vi->evdevfd, &evdev, sizeof(evdev));
127 perror("vi_host_handle_status: write");
131 static void vi_handle_sts(VuDev *dev, int qidx)
133 VuInput *vi = container_of(dev, VuInput, dev.parent);
134 VuVirtq *vq = vu_get_queue(dev, qidx);
135 virtio_input_event event;
136 VuVirtqElement *elem;
139 g_debug("%s", G_STRFUNC);
142 elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
147 memset(&event, 0, sizeof(event));
148 len = iov_to_buf(elem->out_sg, elem->out_num,
149 0, &event, sizeof(event));
150 vi_handle_status(vi, &event);
151 vu_queue_push(dev, vq, elem, len);
155 vu_queue_notify(&vi->dev.parent, vq);
159 vi_panic(VuDev *dev, const char *msg)
161 g_critical("%s\n", msg);
166 vi_queue_set_started(VuDev *dev, int qidx, bool started)
168 VuInput *vi = container_of(dev, VuInput, dev.parent);
169 VuVirtq *vq = vu_get_queue(dev, qidx);
171 g_debug("queue started %d:%d", qidx, started);
174 vu_set_queue_handler(dev, vq, started ? vi_handle_sts : NULL);
177 started = vu_queue_started(dev, vu_get_queue(dev, 0)) &&
178 vu_queue_started(dev, vu_get_queue(dev, 1));
180 if (started && !vi->evsrc) {
181 vi->evsrc = vug_source_new(&vi->dev, vi->evdevfd,
182 G_IO_IN, vi_evdev_watch, vi);
185 if (!started && vi->evsrc) {
186 g_source_destroy(vi->evsrc);
191 static virtio_input_config *
192 vi_find_config(VuInput *vi, uint8_t select, uint8_t subsel)
194 virtio_input_config *cfg;
197 for (i = 0; i < vi->config->len; i++) {
198 cfg = &g_array_index(vi->config, virtio_input_config, i);
199 if (select == cfg->select && subsel == cfg->subsel) {
207 static int vi_get_config(VuDev *dev, uint8_t *config, uint32_t len)
209 VuInput *vi = container_of(dev, VuInput, dev.parent);
211 g_return_val_if_fail(len <= sizeof(*vi->sel_config), -1);
213 if (vi->sel_config) {
214 memcpy(config, vi->sel_config, len);
216 memset(config, 0, len);
222 static int vi_set_config(VuDev *dev, const uint8_t *data,
223 uint32_t offset, uint32_t size,
226 VuInput *vi = container_of(dev, VuInput, dev.parent);
227 virtio_input_config *config = (virtio_input_config *)data;
229 vi->sel_config = vi_find_config(vi, config->select, config->subsel);
234 static const VuDevIface vuiface = {
235 .queue_set_started = vi_queue_set_started,
236 .get_config = vi_get_config,
237 .set_config = vi_set_config,
241 vi_bits_config(VuInput *vi, int type, int count)
243 virtio_input_config bits;
246 memset(&bits, 0, sizeof(bits));
247 rc = ioctl(vi->evdevfd, EVIOCGBIT(type, count / 8), bits.u.bitmap);
252 for (i = 0; i < count / 8; i++) {
253 if (bits.u.bitmap[i]) {
261 bits.select = VIRTIO_INPUT_CFG_EV_BITS;
264 g_array_append_val(vi->config, bits);
267 static char *opt_evdev;
268 static int opt_fdnum = -1;
269 static char *opt_socket_path;
270 static gboolean opt_nograb;
271 static gboolean opt_print_caps;
273 static GOptionEntry entries[] = {
274 { "print-capabilities", 'c', 0, G_OPTION_ARG_NONE, &opt_print_caps,
275 "Print capabilities", NULL },
276 { "no-grab", 'n', 0, G_OPTION_ARG_NONE, &opt_nograb,
277 "Don't grab device", NULL },
278 { "fd", 'f', 0, G_OPTION_ARG_INT, &opt_fdnum,
279 "Use inherited fd socket", "FDNUM" },
280 { "socket-path", 's', 0, G_OPTION_ARG_FILENAME, &opt_socket_path,
281 "Use UNIX socket path", "PATH" },
282 { "evdev-path", 'p', 0, G_OPTION_ARG_FILENAME, &opt_evdev,
283 "evdev input device path", "PATH" },
288 main(int argc, char *argv[])
290 GMainLoop *loop = NULL;
293 virtio_input_config id;
295 GError *error = NULL;
296 GOptionContext *context;
298 context = g_option_context_new(NULL);
299 g_option_context_add_main_entries(context, entries, NULL);
300 if (!g_option_context_parse(context, &argc, &argv, &error)) {
301 g_printerr("Option parsing failed: %s\n", error->message);
304 if (opt_print_caps) {
306 g_print(" \"type\": \"input\",\n");
307 g_print(" \"features\": [\n");
308 g_print(" \"evdev-path\",\n");
309 g_print(" \"no-grab\"\n");
315 g_printerr("Please specify an evdev path\n");
318 if ((!!opt_socket_path + (opt_fdnum != -1)) != 1) {
319 g_printerr("Please specify either --fd or --socket-path\n");
323 vi.evdevfd = open(opt_evdev, O_RDWR);
324 if (vi.evdevfd < 0) {
325 g_printerr("Failed to open evdev: %s\n", g_strerror(errno));
329 rc = ioctl(vi.evdevfd, EVIOCGVERSION, &ver);
331 g_printerr("%s: is not an evdev device\n", argv[1]);
336 rc = ioctl(vi.evdevfd, EVIOCGRAB, 1);
338 g_printerr("Failed to grab device\n");
343 vi.config = g_array_new(false, false, sizeof(virtio_input_config));
344 memset(&id, 0, sizeof(id));
345 if (ioctl(vi.evdevfd, EVIOCGNAME(sizeof(id.u.string) - 1),
347 g_printerr("Failed to get evdev name: %s\n", g_strerror(errno));
350 id.select = VIRTIO_INPUT_CFG_ID_NAME;
351 id.size = strlen(id.u.string);
352 g_array_append_val(vi.config, id);
354 if (ioctl(vi.evdevfd, EVIOCGID, &ids) == 0) {
355 memset(&id, 0, sizeof(id));
356 id.select = VIRTIO_INPUT_CFG_ID_DEVIDS;
357 id.size = sizeof(struct virtio_input_devids);
358 id.u.ids.bustype = cpu_to_le16(ids.bustype);
359 id.u.ids.vendor = cpu_to_le16(ids.vendor);
360 id.u.ids.product = cpu_to_le16(ids.product);
361 id.u.ids.version = cpu_to_le16(ids.version);
362 g_array_append_val(vi.config, id);
365 vi_bits_config(&vi, EV_KEY, KEY_CNT);
366 vi_bits_config(&vi, EV_REL, REL_CNT);
367 vi_bits_config(&vi, EV_ABS, ABS_CNT);
368 vi_bits_config(&vi, EV_MSC, MSC_CNT);
369 vi_bits_config(&vi, EV_SW, SW_CNT);
370 g_debug("config length: %u", vi.config->len);
372 if (opt_socket_path) {
373 int lsock = unix_listen(opt_socket_path, &error_fatal);
375 g_printerr("Failed to listen on %s.\n", opt_socket_path);
378 fd = accept(lsock, NULL, NULL);
384 g_printerr("Invalid vhost-user socket.\n");
387 vug_init(&vi.dev, fd, vi_panic, &vuiface);
389 loop = g_main_loop_new(NULL, FALSE);
390 g_main_loop_run(loop);
391 g_main_loop_unref(loop);
396 g_source_unref(vi.evsrc);
398 g_array_free(vi.config, TRUE);