[mirror_ubuntu-bionic-kernel.git] / drivers / virtio / virtio_input.c

#include <linux/module.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/input.h>

#include <uapi/linux/virtio_ids.h>
#include <uapi/linux/virtio_input.h>

struct virtio_input {
	struct virtio_device       *vdev;
	struct input_dev           *idev;
	char                       name[64];
	char                       serial[64];
	char                       phys[64];
	struct virtqueue           *evt, *sts;
	struct virtio_input_event  evts[64];
	spinlock_t                 lock;
	bool                       ready;
};

static void virtinput_queue_evtbuf(struct virtio_input *vi,
				   struct virtio_input_event *evtbuf)
{
	struct scatterlist sg[1];

	sg_init_one(sg, evtbuf, sizeof(*evtbuf));
	virtqueue_add_inbuf(vi->evt, sg, 1, evtbuf, GFP_ATOMIC);
}

static void virtinput_recv_events(struct virtqueue *vq)
{
	struct virtio_input *vi = vq->vdev->priv;
	struct virtio_input_event *event;
	unsigned long flags;
	unsigned int len;

	spin_lock_irqsave(&vi->lock, flags);
	if (vi->ready) {
		while ((event = virtqueue_get_buf(vi->evt, &len)) != NULL) {
			spin_unlock_irqrestore(&vi->lock, flags);
			input_event(vi->idev,
				    le16_to_cpu(event->type),
				    le16_to_cpu(event->code),
				    le32_to_cpu(event->value));
			spin_lock_irqsave(&vi->lock, flags);
			virtinput_queue_evtbuf(vi, event);
		}
		virtqueue_kick(vq);
	}
	spin_unlock_irqrestore(&vi->lock, flags);
}

/*
 * On error we are losing the status update, which isn't critical as
 * this is typically used for stuff like keyboard leds.
 */
static int virtinput_send_status(struct virtio_input *vi,
				 u16 type, u16 code, s32 value)
{
	struct virtio_input_event *stsbuf;
	struct scatterlist sg[1];
	unsigned long flags;
	int rc;

	stsbuf = kzalloc(sizeof(*stsbuf), GFP_ATOMIC);
	if (!stsbuf)
		return -ENOMEM;

	stsbuf->type  = cpu_to_le16(type);
	stsbuf->code  = cpu_to_le16(code);
	stsbuf->value = cpu_to_le32(value);
	sg_init_one(sg, stsbuf, sizeof(*stsbuf));

	spin_lock_irqsave(&vi->lock, flags);
	if (vi->ready) {
		rc = virtqueue_add_outbuf(vi->sts, sg, 1, stsbuf, GFP_ATOMIC);
		virtqueue_kick(vi->sts);
	} else {
		rc = -ENODEV;
	}
	spin_unlock_irqrestore(&vi->lock, flags);

	if (rc != 0)
		kfree(stsbuf);
	return rc;
}

static void virtinput_recv_status(struct virtqueue *vq)
{
	struct virtio_input *vi = vq->vdev->priv;
	struct virtio_input_event *stsbuf;
	unsigned long flags;
	unsigned int len;

	spin_lock_irqsave(&vi->lock, flags);
	while ((stsbuf = virtqueue_get_buf(vi->sts, &len)) != NULL)
		kfree(stsbuf);
	spin_unlock_irqrestore(&vi->lock, flags);
}

static int virtinput_status(struct input_dev *idev, unsigned int type,
			    unsigned int code, int value)
{
	struct virtio_input *vi = input_get_drvdata(idev);

	return virtinput_send_status(vi, type, code, value);
}

static u8 virtinput_cfg_select(struct virtio_input *vi,
			       u8 select, u8 subsel)
{
	u8 size;

	virtio_cwrite(vi->vdev, struct virtio_input_config, select, &select);
	virtio_cwrite(vi->vdev, struct virtio_input_config, subsel, &subsel);
	virtio_cread(vi->vdev, struct virtio_input_config, size, &size);
	return size;
}

static void virtinput_cfg_bits(struct virtio_input *vi, int select, int subsel,
			       unsigned long *bits, unsigned int bitcount)
{
	unsigned int bit;
	u8 *virtio_bits;
	u8 bytes;

	bytes = virtinput_cfg_select(vi, select, subsel);
	if (!bytes)
		return;
	if (bitcount > bytes * 8)
		bitcount = bytes * 8;

	/*
	 * Bitmap in virtio config space is a simple stream of bytes,
	 * with the first byte carrying bits 0-7, second bits 8-15 and
	 * so on.
	 */
	virtio_bits = kzalloc(bytes, GFP_KERNEL);
	if (!virtio_bits)
		return;
	virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
					      u.bitmap),
			   virtio_bits, bytes);
	for (bit = 0; bit < bitcount; bit++) {
		if (virtio_bits[bit / 8] & (1 << (bit % 8)))
			__set_bit(bit, bits);
	}
	kfree(virtio_bits);

	if (select == VIRTIO_INPUT_CFG_EV_BITS)
		__set_bit(subsel, vi->idev->evbit);
}

static void virtinput_cfg_abs(struct virtio_input *vi, int abs)
{
	u32 mi, ma, re, fu, fl;

	virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ABS_INFO, abs);
	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.min, &mi);
	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.max, &ma);
	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.res, &re);
	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.fuzz, &fu);
	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.flat, &fl);
	input_set_abs_params(vi->idev, abs, mi, ma, fu, fl);
	input_abs_set_res(vi->idev, abs, re);
}

static int virtinput_init_vqs(struct virtio_input *vi)
{
	struct virtqueue *vqs[2];
	vq_callback_t *cbs[] = { virtinput_recv_events,
				 virtinput_recv_status };
	static const char * const names[] = { "events", "status" };
	int err;

	err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names,
			NULL);
	if (err)
		return err;
	vi->evt = vqs[0];
	vi->sts = vqs[1];

	return 0;
}

static void virtinput_fill_evt(struct virtio_input *vi)
{
	unsigned long flags;
	int i, size;

	spin_lock_irqsave(&vi->lock, flags);
	size = virtqueue_get_vring_size(vi->evt);
	if (size > ARRAY_SIZE(vi->evts))
		size = ARRAY_SIZE(vi->evts);
	for (i = 0; i < size; i++)
		virtinput_queue_evtbuf(vi, &vi->evts[i]);
	virtqueue_kick(vi->evt);
	spin_unlock_irqrestore(&vi->lock, flags);
}

static int virtinput_probe(struct virtio_device *vdev)
{
	struct virtio_input *vi;
	unsigned long flags;
	size_t size;
	int abs, err;

	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
		return -ENODEV;

	vi = kzalloc(sizeof(*vi), GFP_KERNEL);
	if (!vi)
		return -ENOMEM;

	vdev->priv = vi;
	vi->vdev = vdev;
	spin_lock_init(&vi->lock);

	err = virtinput_init_vqs(vi);
	if (err)
		goto err_init_vq;

	vi->idev = input_allocate_device();
	if (!vi->idev) {
		err = -ENOMEM;
		goto err_input_alloc;
	}
	input_set_drvdata(vi->idev, vi);

	size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_NAME, 0);
	virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
					      u.string),
			   vi->name, min(size, sizeof(vi->name)));
	size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_SERIAL, 0);
	virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
					      u.string),
			   vi->serial, min(size, sizeof(vi->serial)));
	snprintf(vi->phys, sizeof(vi->phys),
		 "virtio%d/input0", vdev->index);
	vi->idev->name = vi->name;
	vi->idev->phys = vi->phys;
	vi->idev->uniq = vi->serial;

	size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_DEVIDS, 0);
	if (size >= sizeof(struct virtio_input_devids)) {
		virtio_cread(vi->vdev, struct virtio_input_config,
			     u.ids.bustype, &vi->idev->id.bustype);
		virtio_cread(vi->vdev, struct virtio_input_config,
			     u.ids.vendor, &vi->idev->id.vendor);
		virtio_cread(vi->vdev, struct virtio_input_config,
			     u.ids.product, &vi->idev->id.product);
		virtio_cread(vi->vdev, struct virtio_input_config,
			     u.ids.version, &vi->idev->id.version);
	} else {
		vi->idev->id.bustype = BUS_VIRTUAL;
	}

	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_PROP_BITS, 0,
			   vi->idev->propbit, INPUT_PROP_CNT);
	size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REP);
	if (size)
		__set_bit(EV_REP, vi->idev->evbit);

	vi->idev->dev.parent = &vdev->dev;
	vi->idev->event = virtinput_status;

	/* device -> kernel */
	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_KEY,
			   vi->idev->keybit, KEY_CNT);
	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REL,
			   vi->idev->relbit, REL_CNT);
	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_ABS,
			   vi->idev->absbit, ABS_CNT);
	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_MSC,
			   vi->idev->mscbit, MSC_CNT);
	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SW,
			   vi->idev->swbit,  SW_CNT);

	/* kernel -> device */
	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_LED,
			   vi->idev->ledbit, LED_CNT);
	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SND,
			   vi->idev->sndbit, SND_CNT);

	if (test_bit(EV_ABS, vi->idev->evbit)) {
		for (abs = 0; abs < ABS_CNT; abs++) {
			if (!test_bit(abs, vi->idev->absbit))
				continue;
			virtinput_cfg_abs(vi, abs);
		}
	}

	virtio_device_ready(vdev);
	vi->ready = true;
	err = input_register_device(vi->idev);
	if (err)
		goto err_input_register;

	virtinput_fill_evt(vi);
	return 0;

err_input_register:
	spin_lock_irqsave(&vi->lock, flags);
	vi->ready = false;
	spin_unlock_irqrestore(&vi->lock, flags);
	input_free_device(vi->idev);
err_input_alloc:
	vdev->config->del_vqs(vdev);
err_init_vq:
	kfree(vi);
	return err;
}

static void virtinput_remove(struct virtio_device *vdev)
{
	struct virtio_input *vi = vdev->priv;
	void *buf;
	unsigned long flags;

	spin_lock_irqsave(&vi->lock, flags);
	vi->ready = false;
	spin_unlock_irqrestore(&vi->lock, flags);

	input_unregister_device(vi->idev);
	vdev->config->reset(vdev);
	while ((buf = virtqueue_detach_unused_buf(vi->sts)) != NULL)
		kfree(buf);
	vdev->config->del_vqs(vdev);
	kfree(vi);
}

#ifdef CONFIG_PM_SLEEP
static int virtinput_freeze(struct virtio_device *vdev)
{
	struct virtio_input *vi = vdev->priv;
	unsigned long flags;

	spin_lock_irqsave(&vi->lock, flags);
	vi->ready = false;
	spin_unlock_irqrestore(&vi->lock, flags);

	vdev->config->del_vqs(vdev);
	return 0;
}

static int virtinput_restore(struct virtio_device *vdev)
{
	struct virtio_input *vi = vdev->priv;
	int err;

	err = virtinput_init_vqs(vi);
	if (err)
		return err;

	virtio_device_ready(vdev);
	vi->ready = true;
	virtinput_fill_evt(vi);
	return 0;
}
#endif

static unsigned int features[] = {
	/* none */
};
static struct virtio_device_id id_table[] = {
	{ VIRTIO_ID_INPUT, VIRTIO_DEV_ANY_ID },
	{ 0 },
};

static struct virtio_driver virtio_input_driver = {
	.driver.name         = KBUILD_MODNAME,
	.driver.owner        = THIS_MODULE,
	.feature_table       = features,
	.feature_table_size  = ARRAY_SIZE(features),
	.id_table            = id_table,
	.probe               = virtinput_probe,
	.remove              = virtinput_remove,
#ifdef CONFIG_PM_SLEEP
	.freeze	             = virtinput_freeze,
	.restore             = virtinput_restore,
#endif
};

module_virtio_driver(virtio_input_driver);
MODULE_DEVICE_TABLE(virtio, id_table);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Virtio input device driver");
MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
Commit	Line	Data
271c8651 GH	1	#include <linux/module.h>
	2	#include <linux/virtio.h>
	3	#include <linux/virtio_config.h>
	4	#include <linux/input.h>
	5
	6	#include <uapi/linux/virtio_ids.h>
	7	#include <uapi/linux/virtio_input.h>
	8
	9	struct virtio_input {
	10	struct virtio_device *vdev;
	11	struct input_dev *idev;
	12	char name[64];
	13	char serial[64];
	14	char phys[64];
	15	struct virtqueue evt, sts;
	16	struct virtio_input_event evts[64];
	17	spinlock_t lock;
	18	bool ready;
	19	};
	20
	21	static void virtinput_queue_evtbuf(struct virtio_input *vi,
	22	struct virtio_input_event *evtbuf)
	23	{
	24	struct scatterlist sg[1];
	25
	26	sg_init_one(sg, evtbuf, sizeof(*evtbuf));
	27	virtqueue_add_inbuf(vi->evt, sg, 1, evtbuf, GFP_ATOMIC);
	28	}
	29
	30	static void virtinput_recv_events(struct virtqueue *vq)
	31	{
	32	struct virtio_input *vi = vq->vdev->priv;
	33	struct virtio_input_event *event;
	34	unsigned long flags;
	35	unsigned int len;
	36
	37	spin_lock_irqsave(&vi->lock, flags);
	38	if (vi->ready) {
	39	while ((event = virtqueue_get_buf(vi->evt, &len)) != NULL) {
	40	spin_unlock_irqrestore(&vi->lock, flags);
	41	input_event(vi->idev,
	42	le16_to_cpu(event->type),
	43	le16_to_cpu(event->code),
	44	le32_to_cpu(event->value));
	45	spin_lock_irqsave(&vi->lock, flags);
	46	virtinput_queue_evtbuf(vi, event);
	47	}
	48	virtqueue_kick(vq);
	49	}
	50	spin_unlock_irqrestore(&vi->lock, flags);
	51	}
	52
	53	/*
	54	* On error we are losing the status update, which isn't critical as
	55	* this is typically used for stuff like keyboard leds.
	56	*/
	57	static int virtinput_send_status(struct virtio_input *vi,
	58	u16 type, u16 code, s32 value)
	59	{
	60	struct virtio_input_event *stsbuf;
	61	struct scatterlist sg[1];
	62	unsigned long flags;
	63	int rc;
	64
65	stsbuf = kzalloc(sizeof(*stsbuf), GFP_ATOMIC);
66	if (!stsbuf)
67	return -ENOMEM;
68
69	stsbuf->type = cpu_to_le16(type);
70	stsbuf->code = cpu_to_le16(code);
71	stsbuf->value = cpu_to_le32(value);
72	sg_init_one(sg, stsbuf, sizeof(*stsbuf));
73
74	spin_lock_irqsave(&vi->lock, flags);
75	if (vi->ready) {
76	rc = virtqueue_add_outbuf(vi->sts, sg, 1, stsbuf, GFP_ATOMIC);
77	virtqueue_kick(vi->sts);
78	} else {
79	rc = -ENODEV;
80	}
81	spin_unlock_irqrestore(&vi->lock, flags);
82
83	if (rc != 0)
84	kfree(stsbuf);
85	return rc;
86	}
87
88	static void virtinput_recv_status(struct virtqueue *vq)
89	{
90	struct virtio_input *vi = vq->vdev->priv;
91	struct virtio_input_event *stsbuf;
92	unsigned long flags;
93	unsigned int len;
94
95	spin_lock_irqsave(&vi->lock, flags);
96	while ((stsbuf = virtqueue_get_buf(vi->sts, &len)) != NULL)
97	kfree(stsbuf);
98	spin_unlock_irqrestore(&vi->lock, flags);
99	}
100
101	static int virtinput_status(struct input_dev *idev, unsigned int type,
102	unsigned int code, int value)
103	{
104	struct virtio_input *vi = input_get_drvdata(idev);
105
106	return virtinput_send_status(vi, type, code, value);
107	}
108
109	static u8 virtinput_cfg_select(struct virtio_input *vi,
110	u8 select, u8 subsel)
111	{
112	u8 size;
113
114	virtio_cwrite(vi->vdev, struct virtio_input_config, select, &select);
115	virtio_cwrite(vi->vdev, struct virtio_input_config, subsel, &subsel);
116	virtio_cread(vi->vdev, struct virtio_input_config, size, &size);
117	return size;
118	}
119
120	static void virtinput_cfg_bits(struct virtio_input *vi, int select, int subsel,
121	unsigned long *bits, unsigned int bitcount)
122	{
123	unsigned int bit;
124	u8 *virtio_bits;
125	u8 bytes;
126
127	bytes = virtinput_cfg_select(vi, select, subsel);
128	if (!bytes)
129	return;
130	if (bitcount > bytes * 8)
131	bitcount = bytes * 8;
132
133	/*
134	* Bitmap in virtio config space is a simple stream of bytes,
135	* with the first byte carrying bits 0-7, second bits 8-15 and
136	* so on.
137	*/
138	virtio_bits = kzalloc(bytes, GFP_KERNEL);
139	if (!virtio_bits)
140	return;
141	virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
142	u.bitmap),
143	virtio_bits, bytes);
144	for (bit = 0; bit < bitcount; bit++) {
145	if (virtio_bits[bit / 8] & (1 << (bit % 8)))
146	__set_bit(bit, bits);
147	}
148	kfree(virtio_bits);
149
150	if (select == VIRTIO_INPUT_CFG_EV_BITS)
151	__set_bit(subsel, vi->idev->evbit);
152	}
153
154	static void virtinput_cfg_abs(struct virtio_input *vi, int abs)
155	{
156	u32 mi, ma, re, fu, fl;
157
158	virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ABS_INFO, abs);
159	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.min, &mi);
160	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.max, &ma);
161	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.res, &re);
162	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.fuzz, &fu);
163	virtio_cread(vi->vdev, struct virtio_input_config, u.abs.flat, &fl);
164	input_set_abs_params(vi->idev, abs, mi, ma, fu, fl);
165	input_abs_set_res(vi->idev, abs, re);
166	}
167
168	static int virtinput_init_vqs(struct virtio_input *vi)
169	{
170	struct virtqueue *vqs[2];
171	vq_callback_t *cbs[] = { virtinput_recv_events,
172	virtinput_recv_status };
f7ad26ff	173	static const char * const names[] = { "events", "status" };
271c8651 GH	174	int err;
271c8651 GH	175
fb5e31d9 CH	176	err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names,
fb5e31d9 CH	177	NULL);
271c8651 GH	178	if (err)
	179	return err;
	180	vi->evt = vqs[0];
	181	vi->sts = vqs[1];
	182
	183	return 0;
	184	}
	185
	186	static void virtinput_fill_evt(struct virtio_input *vi)
	187	{
	188	unsigned long flags;
	189	int i, size;
	190
	191	spin_lock_irqsave(&vi->lock, flags);
	192	size = virtqueue_get_vring_size(vi->evt);
	193	if (size > ARRAY_SIZE(vi->evts))
	194	size = ARRAY_SIZE(vi->evts);
	195	for (i = 0; i < size; i++)
	196	virtinput_queue_evtbuf(vi, &vi->evts[i]);
	197	virtqueue_kick(vi->evt);
	198	spin_unlock_irqrestore(&vi->lock, flags);
	199	}
	200
	201	static int virtinput_probe(struct virtio_device *vdev)
	202	{
	203	struct virtio_input *vi;
	204	unsigned long flags;
	205	size_t size;
	206	int abs, err;
	207
	208	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
	209	return -ENODEV;
	210
	211	vi = kzalloc(sizeof(*vi), GFP_KERNEL);
	212	if (!vi)
	213	return -ENOMEM;
	214
	215	vdev->priv = vi;
	216	vi->vdev = vdev;
	217	spin_lock_init(&vi->lock);
	218
	219	err = virtinput_init_vqs(vi);
	220	if (err)
	221	goto err_init_vq;
	222
	223	vi->idev = input_allocate_device();
	224	if (!vi->idev) {
	225	err = -ENOMEM;
	226	goto err_input_alloc;
	227	}
	228	input_set_drvdata(vi->idev, vi);
	229
	230	size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_NAME, 0);
	231	virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
	232	u.string),
	233	vi->name, min(size, sizeof(vi->name)));
	234	size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_SERIAL, 0);
	235	virtio_cread_bytes(vi->vdev, offsetof(struct virtio_input_config,
	236	u.string),
	237	vi->serial, min(size, sizeof(vi->serial)));
	238	snprintf(vi->phys, sizeof(vi->phys),
	239	"virtio%d/input0", vdev->index);
	240	vi->idev->name = vi->name;
	241	vi->idev->phys = vi->phys;
242	vi->idev->uniq = vi->serial;
243
244	size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_ID_DEVIDS, 0);
245	if (size >= sizeof(struct virtio_input_devids)) {
246	virtio_cread(vi->vdev, struct virtio_input_config,
247	u.ids.bustype, &vi->idev->id.bustype);
248	virtio_cread(vi->vdev, struct virtio_input_config,
249	u.ids.vendor, &vi->idev->id.vendor);
250	virtio_cread(vi->vdev, struct virtio_input_config,
251	u.ids.product, &vi->idev->id.product);
252	virtio_cread(vi->vdev, struct virtio_input_config,
253	u.ids.version, &vi->idev->id.version);
254	} else {
255	vi->idev->id.bustype = BUS_VIRTUAL;
256	}
257
258	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_PROP_BITS, 0,
259	vi->idev->propbit, INPUT_PROP_CNT);
260	size = virtinput_cfg_select(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REP);
261	if (size)
262	__set_bit(EV_REP, vi->idev->evbit);
263
264	vi->idev->dev.parent = &vdev->dev;
265	vi->idev->event = virtinput_status;
266
267	/* device -> kernel */
268	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_KEY,
269	vi->idev->keybit, KEY_CNT);
270	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_REL,
271	vi->idev->relbit, REL_CNT);
272	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_ABS,
273	vi->idev->absbit, ABS_CNT);
274	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_MSC,
275	vi->idev->mscbit, MSC_CNT);
276	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SW,
277	vi->idev->swbit, SW_CNT);
278
279	/* kernel -> device */
280	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_LED,
281	vi->idev->ledbit, LED_CNT);
282	virtinput_cfg_bits(vi, VIRTIO_INPUT_CFG_EV_BITS, EV_SND,
283	vi->idev->sndbit, SND_CNT);
284
285	if (test_bit(EV_ABS, vi->idev->evbit)) {
286	for (abs = 0; abs < ABS_CNT; abs++) {
287	if (!test_bit(abs, vi->idev->absbit))
288	continue;
289	virtinput_cfg_abs(vi, abs);
290	}
291	}
292
293	virtio_device_ready(vdev);
294	vi->ready = true;
295	err = input_register_device(vi->idev);
296	if (err)
297	goto err_input_register;
298
299	virtinput_fill_evt(vi);
300	return 0;
301
302	err_input_register:
303	spin_lock_irqsave(&vi->lock, flags);
304	vi->ready = false;
305	spin_unlock_irqrestore(&vi->lock, flags);
306	input_free_device(vi->idev);
307	err_input_alloc:
308	vdev->config->del_vqs(vdev);
309	err_init_vq:
310	kfree(vi);
311	return err;
312	}
313
314	static void virtinput_remove(struct virtio_device *vdev)
315	{
316	struct virtio_input *vi = vdev->priv;
df4198b1	317	void *buf;
271c8651 GH	318	unsigned long flags;
	319
	320	spin_lock_irqsave(&vi->lock, flags);
	321	vi->ready = false;
	322	spin_unlock_irqrestore(&vi->lock, flags);
	323
	324	input_unregister_device(vi->idev);
df4198b1 JW	325	vdev->config->reset(vdev);
	326	while ((buf = virtqueue_detach_unused_buf(vi->sts)) != NULL)
	327	kfree(buf);
271c8651 GH	328	vdev->config->del_vqs(vdev);
	329	kfree(vi);
	330	}
	331
	332	#ifdef CONFIG_PM_SLEEP
	333	static int virtinput_freeze(struct virtio_device *vdev)
	334	{
	335	struct virtio_input *vi = vdev->priv;
	336	unsigned long flags;
	337
	338	spin_lock_irqsave(&vi->lock, flags);
	339	vi->ready = false;
	340	spin_unlock_irqrestore(&vi->lock, flags);
	341
	342	vdev->config->del_vqs(vdev);
	343	return 0;
	344	}
	345
	346	static int virtinput_restore(struct virtio_device *vdev)
	347	{
	348	struct virtio_input *vi = vdev->priv;
	349	int err;
	350
	351	err = virtinput_init_vqs(vi);
	352	if (err)
	353	return err;
	354
	355	virtio_device_ready(vdev);
	356	vi->ready = true;
	357	virtinput_fill_evt(vi);
	358	return 0;
	359	}
	360	#endif
	361
	362	static unsigned int features[] = {
	363	/* none */
	364	};
	365	static struct virtio_device_id id_table[] = {
	366	{ VIRTIO_ID_INPUT, VIRTIO_DEV_ANY_ID },
	367	{ 0 },
	368	};
	369
	370	static struct virtio_driver virtio_input_driver = {
	371	.driver.name = KBUILD_MODNAME,
	372	.driver.owner = THIS_MODULE,
	373	.feature_table = features,
	374	.feature_table_size = ARRAY_SIZE(features),
	375	.id_table = id_table,
	376	.probe = virtinput_probe,
	377	.remove = virtinput_remove,
	378	#ifdef CONFIG_PM_SLEEP
	379	.freeze = virtinput_freeze,
	380	.restore = virtinput_restore,
	381	#endif
	382	};
	383
	384	module_virtio_driver(virtio_input_driver);
	385	MODULE_DEVICE_TABLE(virtio, id_table);
	386
	387	MODULE_LICENSE("GPL");
	388	MODULE_DESCRIPTION("Virtio input device driver");
	389	MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");