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path: root/drivers/gpio/gpio-virtio.c
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Diffstat (limited to 'drivers/gpio/gpio-virtio.c')
-rw-r--r--drivers/gpio/gpio-virtio.c664
1 files changed, 664 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-virtio.c b/drivers/gpio/gpio-virtio.c
new file mode 100644
index 000000000..fcc5e8c08
--- /dev/null
+++ b/drivers/gpio/gpio-virtio.c
@@ -0,0 +1,664 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * GPIO driver for virtio-based virtual GPIO controllers
+ *
+ * Copyright (C) 2021 metux IT consult
+ * Enrico Weigelt, metux IT consult <info@metux.net>
+ *
+ * Copyright (C) 2021 Linaro.
+ * Viresh Kumar <viresh.kumar@linaro.org>
+ */
+
+#include <linux/completion.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/virtio_config.h>
+#include <uapi/linux/virtio_gpio.h>
+#include <uapi/linux/virtio_ids.h>
+
+struct virtio_gpio_line {
+ struct mutex lock; /* Protects line operation */
+ struct completion completion;
+ struct virtio_gpio_request req ____cacheline_aligned;
+ struct virtio_gpio_response res ____cacheline_aligned;
+ unsigned int rxlen;
+};
+
+struct vgpio_irq_line {
+ u8 type;
+ bool disabled;
+ bool masked;
+ bool queued;
+ bool update_pending;
+ bool queue_pending;
+
+ struct virtio_gpio_irq_request ireq ____cacheline_aligned;
+ struct virtio_gpio_irq_response ires ____cacheline_aligned;
+};
+
+struct virtio_gpio {
+ struct virtio_device *vdev;
+ struct mutex lock; /* Protects virtqueue operation */
+ struct gpio_chip gc;
+ struct virtio_gpio_line *lines;
+ struct virtqueue *request_vq;
+
+ /* irq support */
+ struct virtqueue *event_vq;
+ struct mutex irq_lock; /* Protects irq operation */
+ raw_spinlock_t eventq_lock; /* Protects queuing of the buffer */
+ struct vgpio_irq_line *irq_lines;
+};
+
+static int _virtio_gpio_req(struct virtio_gpio *vgpio, u16 type, u16 gpio,
+ u8 txvalue, u8 *rxvalue, void *response, u32 rxlen)
+{
+ struct virtio_gpio_line *line = &vgpio->lines[gpio];
+ struct virtio_gpio_request *req = &line->req;
+ struct virtio_gpio_response *res = response;
+ struct scatterlist *sgs[2], req_sg, res_sg;
+ struct device *dev = &vgpio->vdev->dev;
+ int ret;
+
+ /*
+ * Prevent concurrent requests for the same line since we have
+ * pre-allocated request/response buffers for each GPIO line. Moreover
+ * Linux always accesses a GPIO line sequentially, so this locking shall
+ * always go through without any delays.
+ */
+ mutex_lock(&line->lock);
+
+ req->type = cpu_to_le16(type);
+ req->gpio = cpu_to_le16(gpio);
+ req->value = cpu_to_le32(txvalue);
+
+ sg_init_one(&req_sg, req, sizeof(*req));
+ sg_init_one(&res_sg, res, rxlen);
+ sgs[0] = &req_sg;
+ sgs[1] = &res_sg;
+
+ line->rxlen = 0;
+ reinit_completion(&line->completion);
+
+ /*
+ * Virtqueue callers need to ensure they don't call its APIs with other
+ * virtqueue operations at the same time.
+ */
+ mutex_lock(&vgpio->lock);
+ ret = virtqueue_add_sgs(vgpio->request_vq, sgs, 1, 1, line, GFP_KERNEL);
+ if (ret) {
+ dev_err(dev, "failed to add request to vq\n");
+ mutex_unlock(&vgpio->lock);
+ goto out;
+ }
+
+ virtqueue_kick(vgpio->request_vq);
+ mutex_unlock(&vgpio->lock);
+
+ wait_for_completion(&line->completion);
+
+ if (unlikely(res->status != VIRTIO_GPIO_STATUS_OK)) {
+ dev_err(dev, "GPIO request failed: %d\n", gpio);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (unlikely(line->rxlen != rxlen)) {
+ dev_err(dev, "GPIO operation returned incorrect len (%u : %u)\n",
+ rxlen, line->rxlen);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (rxvalue)
+ *rxvalue = res->value;
+
+out:
+ mutex_unlock(&line->lock);
+ return ret;
+}
+
+static int virtio_gpio_req(struct virtio_gpio *vgpio, u16 type, u16 gpio,
+ u8 txvalue, u8 *rxvalue)
+{
+ struct virtio_gpio_line *line = &vgpio->lines[gpio];
+ struct virtio_gpio_response *res = &line->res;
+
+ return _virtio_gpio_req(vgpio, type, gpio, txvalue, rxvalue, res,
+ sizeof(*res));
+}
+
+static void virtio_gpio_free(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+
+ virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_SET_DIRECTION, gpio,
+ VIRTIO_GPIO_DIRECTION_NONE, NULL);
+}
+
+static int virtio_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ u8 direction;
+ int ret;
+
+ ret = virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_GET_DIRECTION, gpio, 0,
+ &direction);
+ if (ret)
+ return ret;
+
+ switch (direction) {
+ case VIRTIO_GPIO_DIRECTION_IN:
+ return GPIO_LINE_DIRECTION_IN;
+ case VIRTIO_GPIO_DIRECTION_OUT:
+ return GPIO_LINE_DIRECTION_OUT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int virtio_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+
+ return virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_SET_DIRECTION, gpio,
+ VIRTIO_GPIO_DIRECTION_IN, NULL);
+}
+
+static int virtio_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
+ int value)
+{
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ int ret;
+
+ ret = virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_SET_VALUE, gpio, value, NULL);
+ if (ret)
+ return ret;
+
+ return virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_SET_DIRECTION, gpio,
+ VIRTIO_GPIO_DIRECTION_OUT, NULL);
+}
+
+static int virtio_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ u8 value;
+ int ret;
+
+ ret = virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_GET_VALUE, gpio, 0, &value);
+ return ret ? ret : value;
+}
+
+static void virtio_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
+{
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+
+ virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_SET_VALUE, gpio, value, NULL);
+}
+
+/* Interrupt handling */
+static void virtio_gpio_irq_prepare(struct virtio_gpio *vgpio, u16 gpio)
+{
+ struct vgpio_irq_line *irq_line = &vgpio->irq_lines[gpio];
+ struct virtio_gpio_irq_request *ireq = &irq_line->ireq;
+ struct virtio_gpio_irq_response *ires = &irq_line->ires;
+ struct scatterlist *sgs[2], req_sg, res_sg;
+ int ret;
+
+ if (WARN_ON(irq_line->queued || irq_line->masked || irq_line->disabled))
+ return;
+
+ ireq->gpio = cpu_to_le16(gpio);
+ sg_init_one(&req_sg, ireq, sizeof(*ireq));
+ sg_init_one(&res_sg, ires, sizeof(*ires));
+ sgs[0] = &req_sg;
+ sgs[1] = &res_sg;
+
+ ret = virtqueue_add_sgs(vgpio->event_vq, sgs, 1, 1, irq_line, GFP_ATOMIC);
+ if (ret) {
+ dev_err(&vgpio->vdev->dev, "failed to add request to eventq\n");
+ return;
+ }
+
+ irq_line->queued = true;
+ virtqueue_kick(vgpio->event_vq);
+}
+
+static void virtio_gpio_irq_enable(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ struct vgpio_irq_line *irq_line = &vgpio->irq_lines[d->hwirq];
+
+ raw_spin_lock(&vgpio->eventq_lock);
+ irq_line->disabled = false;
+ irq_line->masked = false;
+ irq_line->queue_pending = true;
+ raw_spin_unlock(&vgpio->eventq_lock);
+
+ irq_line->update_pending = true;
+}
+
+static void virtio_gpio_irq_disable(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ struct vgpio_irq_line *irq_line = &vgpio->irq_lines[d->hwirq];
+
+ raw_spin_lock(&vgpio->eventq_lock);
+ irq_line->disabled = true;
+ irq_line->masked = true;
+ irq_line->queue_pending = false;
+ raw_spin_unlock(&vgpio->eventq_lock);
+
+ irq_line->update_pending = true;
+}
+
+static void virtio_gpio_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ struct vgpio_irq_line *irq_line = &vgpio->irq_lines[d->hwirq];
+
+ raw_spin_lock(&vgpio->eventq_lock);
+ irq_line->masked = true;
+ raw_spin_unlock(&vgpio->eventq_lock);
+}
+
+static void virtio_gpio_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ struct vgpio_irq_line *irq_line = &vgpio->irq_lines[d->hwirq];
+
+ raw_spin_lock(&vgpio->eventq_lock);
+ irq_line->masked = false;
+
+ /* Queue the buffer unconditionally on unmask */
+ virtio_gpio_irq_prepare(vgpio, d->hwirq);
+ raw_spin_unlock(&vgpio->eventq_lock);
+}
+
+static int virtio_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ struct vgpio_irq_line *irq_line = &vgpio->irq_lines[d->hwirq];
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ type = VIRTIO_GPIO_IRQ_TYPE_EDGE_RISING;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ type = VIRTIO_GPIO_IRQ_TYPE_EDGE_FALLING;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ type = VIRTIO_GPIO_IRQ_TYPE_EDGE_BOTH;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ type = VIRTIO_GPIO_IRQ_TYPE_LEVEL_LOW;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ type = VIRTIO_GPIO_IRQ_TYPE_LEVEL_HIGH;
+ break;
+ default:
+ dev_err(&vgpio->vdev->dev, "unsupported irq type: %u\n", type);
+ return -EINVAL;
+ }
+
+ irq_line->type = type;
+ irq_line->update_pending = true;
+
+ return 0;
+}
+
+static void virtio_gpio_irq_bus_lock(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+
+ mutex_lock(&vgpio->irq_lock);
+}
+
+static void virtio_gpio_irq_bus_sync_unlock(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct virtio_gpio *vgpio = gpiochip_get_data(gc);
+ struct vgpio_irq_line *irq_line = &vgpio->irq_lines[d->hwirq];
+ u8 type = irq_line->disabled ? VIRTIO_GPIO_IRQ_TYPE_NONE : irq_line->type;
+ unsigned long flags;
+
+ if (irq_line->update_pending) {
+ irq_line->update_pending = false;
+ virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_IRQ_TYPE, d->hwirq, type,
+ NULL);
+
+ /* Queue the buffer only after interrupt is enabled */
+ raw_spin_lock_irqsave(&vgpio->eventq_lock, flags);
+ if (irq_line->queue_pending) {
+ irq_line->queue_pending = false;
+ virtio_gpio_irq_prepare(vgpio, d->hwirq);
+ }
+ raw_spin_unlock_irqrestore(&vgpio->eventq_lock, flags);
+ }
+
+ mutex_unlock(&vgpio->irq_lock);
+}
+
+static struct irq_chip vgpio_irq_chip = {
+ .name = "virtio-gpio",
+ .irq_enable = virtio_gpio_irq_enable,
+ .irq_disable = virtio_gpio_irq_disable,
+ .irq_mask = virtio_gpio_irq_mask,
+ .irq_unmask = virtio_gpio_irq_unmask,
+ .irq_set_type = virtio_gpio_irq_set_type,
+
+ /* These are required to implement irqchip for slow busses */
+ .irq_bus_lock = virtio_gpio_irq_bus_lock,
+ .irq_bus_sync_unlock = virtio_gpio_irq_bus_sync_unlock,
+};
+
+static bool ignore_irq(struct virtio_gpio *vgpio, int gpio,
+ struct vgpio_irq_line *irq_line)
+{
+ bool ignore = false;
+
+ raw_spin_lock(&vgpio->eventq_lock);
+ irq_line->queued = false;
+
+ /* Interrupt is disabled currently */
+ if (irq_line->masked || irq_line->disabled) {
+ ignore = true;
+ goto unlock;
+ }
+
+ /*
+ * Buffer is returned as the interrupt was disabled earlier, but is
+ * enabled again now. Requeue the buffers.
+ */
+ if (irq_line->ires.status == VIRTIO_GPIO_IRQ_STATUS_INVALID) {
+ virtio_gpio_irq_prepare(vgpio, gpio);
+ ignore = true;
+ goto unlock;
+ }
+
+ if (WARN_ON(irq_line->ires.status != VIRTIO_GPIO_IRQ_STATUS_VALID))
+ ignore = true;
+
+unlock:
+ raw_spin_unlock(&vgpio->eventq_lock);
+
+ return ignore;
+}
+
+static void virtio_gpio_event_vq(struct virtqueue *vq)
+{
+ struct virtio_gpio *vgpio = vq->vdev->priv;
+ struct device *dev = &vgpio->vdev->dev;
+ struct vgpio_irq_line *irq_line;
+ int gpio, ret;
+ unsigned int len;
+
+ while (true) {
+ irq_line = virtqueue_get_buf(vgpio->event_vq, &len);
+ if (!irq_line)
+ break;
+
+ if (len != sizeof(irq_line->ires)) {
+ dev_err(dev, "irq with incorrect length (%u : %u)\n",
+ len, (unsigned int)sizeof(irq_line->ires));
+ continue;
+ }
+
+ /*
+ * Find GPIO line number from the offset of irq_line within the
+ * irq_lines block. We can also get GPIO number from
+ * irq-request, but better not to rely on a buffer returned by
+ * remote.
+ */
+ gpio = irq_line - vgpio->irq_lines;
+ WARN_ON(gpio >= vgpio->gc.ngpio);
+
+ if (unlikely(ignore_irq(vgpio, gpio, irq_line)))
+ continue;
+
+ ret = generic_handle_domain_irq(vgpio->gc.irq.domain, gpio);
+ if (ret)
+ dev_err(dev, "failed to handle interrupt: %d\n", ret);
+ }
+}
+
+static void virtio_gpio_request_vq(struct virtqueue *vq)
+{
+ struct virtio_gpio_line *line;
+ unsigned int len;
+
+ do {
+ line = virtqueue_get_buf(vq, &len);
+ if (!line)
+ return;
+
+ line->rxlen = len;
+ complete(&line->completion);
+ } while (1);
+}
+
+static void virtio_gpio_free_vqs(struct virtio_device *vdev)
+{
+ virtio_reset_device(vdev);
+ vdev->config->del_vqs(vdev);
+}
+
+static int virtio_gpio_alloc_vqs(struct virtio_gpio *vgpio,
+ struct virtio_device *vdev)
+{
+ const char * const names[] = { "requestq", "eventq" };
+ vq_callback_t *cbs[] = {
+ virtio_gpio_request_vq,
+ virtio_gpio_event_vq,
+ };
+ struct virtqueue *vqs[2] = { NULL, NULL };
+ int ret;
+
+ ret = virtio_find_vqs(vdev, vgpio->irq_lines ? 2 : 1, vqs, cbs, names, NULL);
+ if (ret) {
+ dev_err(&vdev->dev, "failed to find vqs: %d\n", ret);
+ return ret;
+ }
+
+ if (!vqs[0]) {
+ dev_err(&vdev->dev, "failed to find requestq vq\n");
+ goto out;
+ }
+ vgpio->request_vq = vqs[0];
+
+ if (vgpio->irq_lines && !vqs[1]) {
+ dev_err(&vdev->dev, "failed to find eventq vq\n");
+ goto out;
+ }
+ vgpio->event_vq = vqs[1];
+
+ return 0;
+
+out:
+ if (vqs[0] || vqs[1])
+ virtio_gpio_free_vqs(vdev);
+
+ return -ENODEV;
+}
+
+static const char **virtio_gpio_get_names(struct virtio_gpio *vgpio,
+ u32 gpio_names_size, u16 ngpio)
+{
+ struct virtio_gpio_response_get_names *res;
+ struct device *dev = &vgpio->vdev->dev;
+ u8 *gpio_names, *str;
+ const char **names;
+ int i, ret, len;
+
+ if (!gpio_names_size)
+ return NULL;
+
+ len = sizeof(*res) + gpio_names_size;
+ res = devm_kzalloc(dev, len, GFP_KERNEL);
+ if (!res)
+ return NULL;
+ gpio_names = res->value;
+
+ ret = _virtio_gpio_req(vgpio, VIRTIO_GPIO_MSG_GET_NAMES, 0, 0, NULL,
+ res, len);
+ if (ret) {
+ dev_err(dev, "Failed to get GPIO names: %d\n", ret);
+ return NULL;
+ }
+
+ names = devm_kcalloc(dev, ngpio, sizeof(*names), GFP_KERNEL);
+ if (!names)
+ return NULL;
+
+ /* NULL terminate the string instead of checking it */
+ gpio_names[gpio_names_size - 1] = '\0';
+
+ for (i = 0, str = gpio_names; i < ngpio; i++) {
+ names[i] = str;
+ str += strlen(str) + 1; /* zero-length strings are allowed */
+
+ if (str > gpio_names + gpio_names_size) {
+ dev_err(dev, "gpio_names block is too short (%d)\n", i);
+ return NULL;
+ }
+ }
+
+ return names;
+}
+
+static int virtio_gpio_probe(struct virtio_device *vdev)
+{
+ struct virtio_gpio_config config;
+ struct device *dev = &vdev->dev;
+ struct virtio_gpio *vgpio;
+ u32 gpio_names_size;
+ u16 ngpio;
+ int ret, i;
+
+ vgpio = devm_kzalloc(dev, sizeof(*vgpio), GFP_KERNEL);
+ if (!vgpio)
+ return -ENOMEM;
+
+ /* Read configuration */
+ virtio_cread_bytes(vdev, 0, &config, sizeof(config));
+ gpio_names_size = le32_to_cpu(config.gpio_names_size);
+ ngpio = le16_to_cpu(config.ngpio);
+ if (!ngpio) {
+ dev_err(dev, "Number of GPIOs can't be zero\n");
+ return -EINVAL;
+ }
+
+ vgpio->lines = devm_kcalloc(dev, ngpio, sizeof(*vgpio->lines), GFP_KERNEL);
+ if (!vgpio->lines)
+ return -ENOMEM;
+
+ for (i = 0; i < ngpio; i++) {
+ mutex_init(&vgpio->lines[i].lock);
+ init_completion(&vgpio->lines[i].completion);
+ }
+
+ mutex_init(&vgpio->lock);
+ vdev->priv = vgpio;
+
+ vgpio->vdev = vdev;
+ vgpio->gc.free = virtio_gpio_free;
+ vgpio->gc.get_direction = virtio_gpio_get_direction;
+ vgpio->gc.direction_input = virtio_gpio_direction_input;
+ vgpio->gc.direction_output = virtio_gpio_direction_output;
+ vgpio->gc.get = virtio_gpio_get;
+ vgpio->gc.set = virtio_gpio_set;
+ vgpio->gc.ngpio = ngpio;
+ vgpio->gc.base = -1; /* Allocate base dynamically */
+ vgpio->gc.label = dev_name(dev);
+ vgpio->gc.parent = dev;
+ vgpio->gc.owner = THIS_MODULE;
+ vgpio->gc.can_sleep = true;
+
+ /* Interrupt support */
+ if (virtio_has_feature(vdev, VIRTIO_GPIO_F_IRQ)) {
+ vgpio->irq_lines = devm_kcalloc(dev, ngpio, sizeof(*vgpio->irq_lines), GFP_KERNEL);
+ if (!vgpio->irq_lines)
+ return -ENOMEM;
+
+ /* The event comes from the outside so no parent handler */
+ vgpio->gc.irq.parent_handler = NULL;
+ vgpio->gc.irq.num_parents = 0;
+ vgpio->gc.irq.parents = NULL;
+ vgpio->gc.irq.default_type = IRQ_TYPE_NONE;
+ vgpio->gc.irq.handler = handle_level_irq;
+ vgpio->gc.irq.chip = &vgpio_irq_chip;
+
+ for (i = 0; i < ngpio; i++) {
+ vgpio->irq_lines[i].type = VIRTIO_GPIO_IRQ_TYPE_NONE;
+ vgpio->irq_lines[i].disabled = true;
+ vgpio->irq_lines[i].masked = true;
+ }
+
+ mutex_init(&vgpio->irq_lock);
+ raw_spin_lock_init(&vgpio->eventq_lock);
+ }
+
+ ret = virtio_gpio_alloc_vqs(vgpio, vdev);
+ if (ret)
+ return ret;
+
+ /* Mark the device ready to perform operations from within probe() */
+ virtio_device_ready(vdev);
+
+ vgpio->gc.names = virtio_gpio_get_names(vgpio, gpio_names_size, ngpio);
+
+ ret = gpiochip_add_data(&vgpio->gc, vgpio);
+ if (ret) {
+ virtio_gpio_free_vqs(vdev);
+ dev_err(dev, "Failed to add virtio-gpio controller\n");
+ }
+
+ return ret;
+}
+
+static void virtio_gpio_remove(struct virtio_device *vdev)
+{
+ struct virtio_gpio *vgpio = vdev->priv;
+
+ gpiochip_remove(&vgpio->gc);
+ virtio_gpio_free_vqs(vdev);
+}
+
+static const struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_GPIO, VIRTIO_DEV_ANY_ID },
+ {},
+};
+MODULE_DEVICE_TABLE(virtio, id_table);
+
+static const unsigned int features[] = {
+ VIRTIO_GPIO_F_IRQ,
+};
+
+static struct virtio_driver virtio_gpio_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
+ .id_table = id_table,
+ .probe = virtio_gpio_probe,
+ .remove = virtio_gpio_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .owner = THIS_MODULE,
+ },
+};
+module_virtio_driver(virtio_gpio_driver);
+
+MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>");
+MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
+MODULE_DESCRIPTION("VirtIO GPIO driver");
+MODULE_LICENSE("GPL");