1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/*
* Copyright © 2017-2022 The Crust Firmware Authors.
* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
*/
#ifndef COMMON_SIMPLE_DEVICE_H
#define COMMON_SIMPLE_DEVICE_H
#include <clock.h>
#include <device.h>
#include <gpio.h>
#include <intrusive.h>
#define SIMPLE_DEVICE_PINS 2
#define SIMPLE_DEVICE_PINS_INIT (const struct gpio_handle[SIMPLE_DEVICE_PINS])
struct simple_device {
struct device dev;
struct clock_handle clock;
const struct gpio_handle *pins;
uintptr_t regs;
};
/**
* Downcast a pointer to a simple device.
*/
static inline const struct simple_device *
to_simple_device(const struct device *dev)
{
return container_of(dev, const struct simple_device, dev);
}
/**
* Probe a simple device, which uses a clock and 0-2 GPIO pins.
*
* This function can be used to implement a device's .probe hook.
*/
int simple_device_probe(const struct device *dev);
/**
* Release a simple device.
*
* This function can be used to implement a device's .release hook.
*/
void simple_device_release(const struct device *dev);
/**
* Adjust the refcount of a device to match the state Linux left it in.
*
* If a device has no references, but its clock is running, acquire a
* persistent reference to prevent the device and its resources from being
* released.
*
* Similarly, if the only reference to a device is one previously acquired by
* this function, and the device's clock is not running, release the reference.
*
* This function must not be called if other references to the device are held.
*/
void simple_device_sync(const struct simple_device *sdev);
#endif /* COMMON_SIMPLE_DEVICE_H */
|
