| #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); |
| 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>"); |