[qemu.git] / hw / input / virtio-input.c

/*
 * This work is licensed under the terms of the GNU GPL, version 2 or
 * (at your option) any later version.  See the COPYING file in the
 * top-level directory.
 */

#include "qemu/iov.h"

#include "hw/qdev.h"
#include "hw/virtio/virtio.h"
#include "hw/virtio/virtio-input.h"

#include "standard-headers/linux/input.h"

/* ----------------------------------------------------------------- */

void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event)
{
    VirtQueueElement elem;
    unsigned have, need;
    int i, len;

    if (!vinput->active) {
        return;
    }

    /* queue up events ... */
    if (vinput->qindex == vinput->qsize) {
        vinput->qsize++;
        vinput->queue = realloc(vinput->queue, vinput->qsize *
                                sizeof(virtio_input_event));
    }
    vinput->queue[vinput->qindex++] = *event;

    /* ... until we see a report sync ... */
    if (event->type != cpu_to_le16(EV_SYN) ||
        event->code != cpu_to_le16(SYN_REPORT)) {
        return;
    }

    /* ... then check available space ... */
    need = sizeof(virtio_input_event) * vinput->qindex;
    virtqueue_get_avail_bytes(vinput->evt, &have, NULL, need, 0);
    if (have < need) {
        vinput->qindex = 0;
        fprintf(stderr, "%s: ENOSPC in vq, dropping events\n", __func__);
        return;
    }

    /* ... and finally pass them to the guest */
    for (i = 0; i < vinput->qindex; i++) {
        if (!virtqueue_pop(vinput->evt, &elem)) {
            /* should not happen, we've checked for space beforehand */
            fprintf(stderr, "%s: Huh?  No vq elem available ...\n", __func__);
            return;
        }
        len = iov_from_buf(elem.in_sg, elem.in_num,
                           0, vinput->queue+i, sizeof(virtio_input_event));
        virtqueue_push(vinput->evt, &elem, len);
    }
    virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt);
    vinput->qindex = 0;
}

static void virtio_input_handle_evt(VirtIODevice *vdev, VirtQueue *vq)
{
    /* nothing */
}

static void virtio_input_handle_sts(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
    VirtIOInput *vinput = VIRTIO_INPUT(vdev);
    virtio_input_event event;
    VirtQueueElement elem;
    int len;

    while (virtqueue_pop(vinput->sts, &elem)) {
        memset(&event, 0, sizeof(event));
        len = iov_to_buf(elem.out_sg, elem.out_num,
                         0, &event, sizeof(event));
        if (vic->handle_status) {
            vic->handle_status(vinput, &event);
        }
        virtqueue_push(vinput->sts, &elem, len);
    }
    virtio_notify(vdev, vinput->sts);
}

static virtio_input_config *virtio_input_find_config(VirtIOInput *vinput,
                                                     uint8_t select,
                                                     uint8_t subsel)
{
    VirtIOInputConfig *cfg;

    QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
        if (select == cfg->config.select &&
            subsel == cfg->config.subsel) {
            return &cfg->config;
        }
    }
    return NULL;
}

void virtio_input_add_config(VirtIOInput *vinput,
                             virtio_input_config *config)
{
    VirtIOInputConfig *cfg;

    if (virtio_input_find_config(vinput, config->select, config->subsel)) {
        /* should not happen */
        fprintf(stderr, "%s: duplicate config: %d/%d\n",
                __func__, config->select, config->subsel);
        abort();
    }

    cfg = g_new0(VirtIOInputConfig, 1);
    cfg->config = *config;
    QTAILQ_INSERT_TAIL(&vinput->cfg_list, cfg, node);
}

void virtio_input_init_config(VirtIOInput *vinput,
                              virtio_input_config *config)
{
    int i = 0;

    QTAILQ_INIT(&vinput->cfg_list);
    while (config[i].select) {
        virtio_input_add_config(vinput, config + i);
        i++;
    }
}

void virtio_input_idstr_config(VirtIOInput *vinput,
                               uint8_t select, const char *string)
{
    virtio_input_config id;

    if (!string) {
        return;
    }
    memset(&id, 0, sizeof(id));
    id.select = select;
    id.size = snprintf(id.u.string, sizeof(id.u.string), "%s", string);
    virtio_input_add_config(vinput, &id);
}

static void virtio_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
{
    VirtIOInput *vinput = VIRTIO_INPUT(vdev);
    virtio_input_config *config;

    config = virtio_input_find_config(vinput, vinput->cfg_select,
                                      vinput->cfg_subsel);
    if (config) {
        memcpy(config_data, config, vinput->cfg_size);
    } else {
        memset(config_data, 0, vinput->cfg_size);
    }
}

static void virtio_input_set_config(VirtIODevice *vdev,
                                    const uint8_t *config_data)
{
    VirtIOInput *vinput = VIRTIO_INPUT(vdev);
    virtio_input_config *config = (virtio_input_config *)config_data;

    vinput->cfg_select = config->select;
    vinput->cfg_subsel = config->subsel;
    virtio_notify_config(vdev);
}

static uint64_t virtio_input_get_features(VirtIODevice *vdev, uint64_t f,
                                          Error **errp)
{
    return f;
}

static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val)
{
    VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
    VirtIOInput *vinput = VIRTIO_INPUT(vdev);

    if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
        if (!vinput->active) {
            vinput->active = true;
            if (vic->change_active) {
                vic->change_active(vinput);
            }
        }
    }
}

static void virtio_input_reset(VirtIODevice *vdev)
{
    VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
    VirtIOInput *vinput = VIRTIO_INPUT(vdev);

    if (vinput->active) {
        vinput->active = false;
        if (vic->change_active) {
            vic->change_active(vinput);
        }
    }
}

static void virtio_input_device_realize(DeviceState *dev, Error **errp)
{
    VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
    VirtIOInput *vinput = VIRTIO_INPUT(dev);
    VirtIOInputConfig *cfg;
    Error *local_err = NULL;

    if (vic->realize) {
        vic->realize(dev, &local_err);
        if (local_err) {
            error_propagate(errp, local_err);
            return;
        }
    }

    virtio_input_idstr_config(vinput, VIRTIO_INPUT_CFG_ID_SERIAL,
                              vinput->serial);

    QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
        if (vinput->cfg_size < cfg->config.size) {
            vinput->cfg_size = cfg->config.size;
        }
    }
    vinput->cfg_size += 8;
    assert(vinput->cfg_size <= sizeof(virtio_input_config));

    virtio_init(vdev, "virtio-input", VIRTIO_ID_INPUT,
                vinput->cfg_size);
    vinput->evt = virtio_add_queue(vdev, 64, virtio_input_handle_evt);
    vinput->sts = virtio_add_queue(vdev, 64, virtio_input_handle_sts);
}

static void virtio_input_device_unrealize(DeviceState *dev, Error **errp)
{
    VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
    Error *local_err = NULL;

    if (vic->unrealize) {
        vic->unrealize(dev, &local_err);
        if (local_err) {
            error_propagate(errp, local_err);
            return;
        }
    }
    virtio_cleanup(vdev);
}

static Property virtio_input_properties[] = {
    DEFINE_PROP_STRING("serial", VirtIOInput, serial),
    DEFINE_PROP_END_OF_LIST(),
};

static void virtio_input_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);

    dc->props          = virtio_input_properties;
    set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
    vdc->realize      = virtio_input_device_realize;
    vdc->unrealize    = virtio_input_device_unrealize;
    vdc->get_config   = virtio_input_get_config;
    vdc->set_config   = virtio_input_set_config;
    vdc->get_features = virtio_input_get_features;
    vdc->set_status   = virtio_input_set_status;
    vdc->reset        = virtio_input_reset;
}

static const TypeInfo virtio_input_info = {
    .name          = TYPE_VIRTIO_INPUT,
    .parent        = TYPE_VIRTIO_DEVICE,
    .instance_size = sizeof(VirtIOInput),
    .class_size    = sizeof(VirtIOInputClass),
    .class_init    = virtio_input_class_init,
    .abstract      = true,
};

/* ----------------------------------------------------------------- */

static void virtio_register_types(void)
{
    type_register_static(&virtio_input_info);
}

type_init(virtio_register_types)
Commit	Line	Data
f73ddbad GH	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/iov.h"
	8
	9	#include "hw/qdev.h"
	10	#include "hw/virtio/virtio.h"
	11	#include "hw/virtio/virtio-input.h"
	12
	13	#include "standard-headers/linux/input.h"
	14
	15	/* ----------------------------------------------------------------- */
	16
	17	void virtio_input_send(VirtIOInput vinput, virtio_input_event event)
	18	{
	19	VirtQueueElement elem;
	20	unsigned have, need;
	21	int i, len;
	22
d9460a75 GH	23	if (!vinput->active) {
	24	return;
	25	}
	26
f73ddbad GH	27	/* queue up events ... */
	28	if (vinput->qindex == vinput->qsize) {
	29	vinput->qsize++;
	30	vinput->queue = realloc(vinput->queue, vinput->qsize *
	31	sizeof(virtio_input_event));
	32	}
	33	vinput->queue[vinput->qindex++] = *event;
	34
	35	/* ... until we see a report sync ... */
	36	if (event->type != cpu_to_le16(EV_SYN) \|\|
	37	event->code != cpu_to_le16(SYN_REPORT)) {
	38	return;
	39	}
	40
	41	/* ... then check available space ... */
	42	need = sizeof(virtio_input_event) * vinput->qindex;
	43	virtqueue_get_avail_bytes(vinput->evt, &have, NULL, need, 0);
	44	if (have < need) {
	45	vinput->qindex = 0;
	46	fprintf(stderr, "%s: ENOSPC in vq, dropping events\n", __func__);
	47	return;
	48	}
	49
	50	/* ... and finally pass them to the guest */
	51	for (i = 0; i < vinput->qindex; i++) {
	52	if (!virtqueue_pop(vinput->evt, &elem)) {
	53	/* should not happen, we've checked for space beforehand */
	54	fprintf(stderr, "%s: Huh? No vq elem available ...\n", __func__);
	55	return;
	56	}
	57	len = iov_from_buf(elem.in_sg, elem.in_num,
	58	0, vinput->queue+i, sizeof(virtio_input_event));
	59	virtqueue_push(vinput->evt, &elem, len);
	60	}
	61	virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt);
	62	vinput->qindex = 0;
	63	}
	64
	65	static void virtio_input_handle_evt(VirtIODevice vdev, VirtQueue vq)
	66	{
	67	/* nothing */
	68	}
	69
	70	static void virtio_input_handle_sts(VirtIODevice vdev, VirtQueue vq)
	71	{
	72	VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
	73	VirtIOInput *vinput = VIRTIO_INPUT(vdev);
	74	virtio_input_event event;
	75	VirtQueueElement elem;
	76	int len;
	77
	78	while (virtqueue_pop(vinput->sts, &elem)) {
	79	memset(&event, 0, sizeof(event));
	80	len = iov_to_buf(elem.out_sg, elem.out_num,
	81	0, &event, sizeof(event));
	82	if (vic->handle_status) {
	83	vic->handle_status(vinput, &event);
	84	}
	85	virtqueue_push(vinput->sts, &elem, len);
	86	}
	87	virtio_notify(vdev, vinput->sts);
	88	}
	89
	90	static virtio_input_config virtio_input_find_config(VirtIOInput vinput,
91	uint8_t select,
92	uint8_t subsel)
93	{
94	VirtIOInputConfig *cfg;
95
96	QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
97	if (select == cfg->config.select &&
98	subsel == cfg->config.subsel) {
99	return &cfg->config;
100	}
101	}
102	return NULL;
103	}
104
105	void virtio_input_add_config(VirtIOInput *vinput,
106	virtio_input_config *config)
107	{
108	VirtIOInputConfig *cfg;
109
110	if (virtio_input_find_config(vinput, config->select, config->subsel)) {
111	/* should not happen */
112	fprintf(stderr, "%s: duplicate config: %d/%d\n",
113	__func__, config->select, config->subsel);
114	abort();
115	}
116
117	cfg = g_new0(VirtIOInputConfig, 1);
118	cfg->config = *config;
119	QTAILQ_INSERT_TAIL(&vinput->cfg_list, cfg, node);
120	}
121
122	void virtio_input_init_config(VirtIOInput *vinput,
123	virtio_input_config *config)
124	{
125	int i = 0;
126
127	QTAILQ_INIT(&vinput->cfg_list);
128	while (config[i].select) {
129	virtio_input_add_config(vinput, config + i);
130	i++;
131	}
132	}
133
134	void virtio_input_idstr_config(VirtIOInput *vinput,
135	uint8_t select, const char *string)
136	{
137	virtio_input_config id;
138
139	if (!string) {
140	return;
141	}
142	memset(&id, 0, sizeof(id));
143	id.select = select;
144	id.size = snprintf(id.u.string, sizeof(id.u.string), "%s", string);
145	virtio_input_add_config(vinput, &id);
146	}
147
148	static void virtio_input_get_config(VirtIODevice vdev, uint8_t config_data)
149	{
150	VirtIOInput *vinput = VIRTIO_INPUT(vdev);
151	virtio_input_config *config;
152
153	config = virtio_input_find_config(vinput, vinput->cfg_select,
154	vinput->cfg_subsel);
155	if (config) {
156	memcpy(config_data, config, vinput->cfg_size);
157	} else {
158	memset(config_data, 0, vinput->cfg_size);
159	}
160	}
161
162	static void virtio_input_set_config(VirtIODevice *vdev,
163	const uint8_t *config_data)
164	{
165	VirtIOInput *vinput = VIRTIO_INPUT(vdev);
166	virtio_input_config config = (virtio_input_config )config_data;
167
168	vinput->cfg_select = config->select;
169	vinput->cfg_subsel = config->subsel;
170	virtio_notify_config(vdev);
171	}
172
9d5b731d JW	173	static uint64_t virtio_input_get_features(VirtIODevice *vdev, uint64_t f,
9d5b731d JW	174	Error **errp)
f73ddbad GH	175	{
	176	return f;
	177	}
	178
	179	static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val)
	180	{
	181	VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
	182	VirtIOInput *vinput = VIRTIO_INPUT(vdev);
	183
	184	if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
	185	if (!vinput->active) {
	186	vinput->active = true;
	187	if (vic->change_active) {
	188	vic->change_active(vinput);
	189	}
	190	}
	191	}
	192	}
	193
	194	static void virtio_input_reset(VirtIODevice *vdev)
	195	{
	196	VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
	197	VirtIOInput *vinput = VIRTIO_INPUT(vdev);
	198
	199	if (vinput->active) {
	200	vinput->active = false;
	201	if (vic->change_active) {
	202	vic->change_active(vinput);
	203	}
	204	}
	205	}
	206
	207	static void virtio_input_device_realize(DeviceState dev, Error *errp)
	208	{
	209	VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
	210	VirtIODevice *vdev = VIRTIO_DEVICE(dev);
	211	VirtIOInput *vinput = VIRTIO_INPUT(dev);
	212	VirtIOInputConfig *cfg;
	213	Error *local_err = NULL;
	214
	215	if (vic->realize) {
	216	vic->realize(dev, &local_err);
	217	if (local_err) {
	218	error_propagate(errp, local_err);
	219	return;
	220	}
	221	}
	222
	223	virtio_input_idstr_config(vinput, VIRTIO_INPUT_CFG_ID_SERIAL,
6f2b9a5b	224	vinput->serial);
f73ddbad GH	225
	226	QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
	227	if (vinput->cfg_size < cfg->config.size) {
	228	vinput->cfg_size = cfg->config.size;
	229	}
	230	}
	231	vinput->cfg_size += 8;
	232	assert(vinput->cfg_size <= sizeof(virtio_input_config));
	233
	234	virtio_init(vdev, "virtio-input", VIRTIO_ID_INPUT,
	235	vinput->cfg_size);
	236	vinput->evt = virtio_add_queue(vdev, 64, virtio_input_handle_evt);
	237	vinput->sts = virtio_add_queue(vdev, 64, virtio_input_handle_sts);
	238	}
	239
	240	static void virtio_input_device_unrealize(DeviceState dev, Error *errp)
	241	{
	242	VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
	243	VirtIODevice *vdev = VIRTIO_DEVICE(dev);
	244	Error *local_err = NULL;
	245
	246	if (vic->unrealize) {
	247	vic->unrealize(dev, &local_err);
	248	if (local_err) {
	249	error_propagate(errp, local_err);
	250	return;
	251	}
	252	}
	253	virtio_cleanup(vdev);
	254	}
	255
6f2b9a5b GH	256	static Property virtio_input_properties[] = {
	257	DEFINE_PROP_STRING("serial", VirtIOInput, serial),
	258	DEFINE_PROP_END_OF_LIST(),
	259	};
	260
f73ddbad GH	261	static void virtio_input_class_init(ObjectClass klass, void data)
	262	{
	263	DeviceClass *dc = DEVICE_CLASS(klass);
	264	VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
	265
6f2b9a5b	266	dc->props = virtio_input_properties;
f73ddbad GH	267	set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
	268	vdc->realize = virtio_input_device_realize;
	269	vdc->unrealize = virtio_input_device_unrealize;
	270	vdc->get_config = virtio_input_get_config;
	271	vdc->set_config = virtio_input_set_config;
	272	vdc->get_features = virtio_input_get_features;
	273	vdc->set_status = virtio_input_set_status;
	274	vdc->reset = virtio_input_reset;
	275	}
	276
	277	static const TypeInfo virtio_input_info = {
	278	.name = TYPE_VIRTIO_INPUT,
	279	.parent = TYPE_VIRTIO_DEVICE,
	280	.instance_size = sizeof(VirtIOInput),
	281	.class_size = sizeof(VirtIOInputClass),
	282	.class_init = virtio_input_class_init,
	283	.abstract = true,
	284	};
	285
	286	/* ----------------------------------------------------------------- */
	287
	288	static void virtio_register_types(void)
	289	{
	290	type_register_static(&virtio_input_info);
	291	}
	292
	293	type_init(virtio_register_types)