mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
synced 2026-04-18 11:33:36 -04:00
3a29355a22
This patch adds a new driver for Virtio based GPIO devices. This allows a guest VM running Linux to access GPIO lines provided by the host. It supports all basic operations, except interrupts for the GPIO lines. Based on the initial work posted by: "Enrico Weigelt, metux IT consult" <lkml@metux.net>. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _LINUX_VIRTIO_GPIO_H
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#define _LINUX_VIRTIO_GPIO_H
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#include <linux/types.h>
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/* Virtio GPIO request types */
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#define VIRTIO_GPIO_MSG_GET_NAMES 0x0001
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#define VIRTIO_GPIO_MSG_GET_DIRECTION 0x0002
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#define VIRTIO_GPIO_MSG_SET_DIRECTION 0x0003
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#define VIRTIO_GPIO_MSG_GET_VALUE 0x0004
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#define VIRTIO_GPIO_MSG_SET_VALUE 0x0005
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/* Possible values of the status field */
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#define VIRTIO_GPIO_STATUS_OK 0x0
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#define VIRTIO_GPIO_STATUS_ERR 0x1
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/* Direction types */
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#define VIRTIO_GPIO_DIRECTION_NONE 0x00
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#define VIRTIO_GPIO_DIRECTION_OUT 0x01
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#define VIRTIO_GPIO_DIRECTION_IN 0x02
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struct virtio_gpio_config {
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__u16 ngpio;
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__u8 padding[2];
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__u32 gpio_names_size;
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} __packed;
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/* Virtio GPIO Request / Response */
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struct virtio_gpio_request {
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__u16 type;
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__u16 gpio;
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__u32 value;
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};
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struct virtio_gpio_response {
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__u8 status;
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__u8 value;
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};
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struct virtio_gpio_response_get_names {
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__u8 status;
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__u8 value[];
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};
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#endif /* _LINUX_VIRTIO_GPIO_H */
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