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gpio: Add virtio-gpio driver

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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>
This commit is contained in:
Viresh Kumar
2021-08-19 10:00:22 +05:30
committed by Bartosz Golaszewski
parent d0ef631d40
commit 3a29355a22
6 changed files with 440 additions and 0 deletions
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47
include/uapi/linux/virtio_gpio.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_VIRTIO_GPIO_H
#define _LINUX_VIRTIO_GPIO_H
#include <linux/types.h>
/* Virtio GPIO request types */
#define VIRTIO_GPIO_MSG_GET_NAMES 0x0001
#define VIRTIO_GPIO_MSG_GET_DIRECTION 0x0002
#define VIRTIO_GPIO_MSG_SET_DIRECTION 0x0003
#define VIRTIO_GPIO_MSG_GET_VALUE 0x0004
#define VIRTIO_GPIO_MSG_SET_VALUE 0x0005
/* Possible values of the status field */
#define VIRTIO_GPIO_STATUS_OK 0x0
#define VIRTIO_GPIO_STATUS_ERR 0x1
/* Direction types */
#define VIRTIO_GPIO_DIRECTION_NONE 0x00
#define VIRTIO_GPIO_DIRECTION_OUT 0x01
#define VIRTIO_GPIO_DIRECTION_IN 0x02
struct virtio_gpio_config {
__u16 ngpio;
__u8 padding[2];
__u32 gpio_names_size;
} __packed;
/* Virtio GPIO Request / Response */
struct virtio_gpio_request {
__u16 type;
__u16 gpio;
__u32 value;
};
struct virtio_gpio_response {
__u8 status;
__u8 value;
};
struct virtio_gpio_response_get_names {
__u8 status;
__u8 value[];
};
#endif /* _LINUX_VIRTIO_GPIO_H */