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
62
63
64
65
66
67
68
69
70
71
72
73
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_GPIO_SHARED_H
#define __LINUX_GPIO_SHARED_H
#include <linux/cleanup.h>
#include <linux/lockdep.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
struct gpio_device;
struct gpio_desc;
struct device;
#if IS_ENABLED(CONFIG_GPIO_SHARED)
int gpio_device_setup_shared(struct gpio_device *gdev);
void gpio_device_teardown_shared(struct gpio_device *gdev);
int gpio_shared_add_proxy_lookup(struct device *consumer, const char *con_id,
unsigned long lflags);
#else
static inline int gpio_device_setup_shared(struct gpio_device *gdev)
{
return 0;
}
static inline void gpio_device_teardown_shared(struct gpio_device *gdev) { }
static inline int gpio_shared_add_proxy_lookup(struct device *consumer,
const char *con_id,
unsigned long lflags)
{
return 0;
}
#endif /* CONFIG_GPIO_SHARED */
struct gpio_shared_desc {
struct gpio_desc *desc;
bool can_sleep;
unsigned long cfg;
unsigned int usecnt;
unsigned int highcnt;
union {
struct mutex mutex;
spinlock_t spinlock;
};
};
struct gpio_shared_desc *devm_gpiod_shared_get(struct device *dev);
DEFINE_LOCK_GUARD_1(gpio_shared_desc_lock, struct gpio_shared_desc,
if (_T->lock->can_sleep)
mutex_lock(&_T->lock->mutex);
else
spin_lock_irqsave(&_T->lock->spinlock, _T->flags),
if (_T->lock->can_sleep)
mutex_unlock(&_T->lock->mutex);
else
spin_unlock_irqrestore(&_T->lock->spinlock, _T->flags),
unsigned long flags)
static inline void gpio_shared_lockdep_assert(struct gpio_shared_desc *shared_desc)
{
if (shared_desc->can_sleep)
lockdep_assert_held(&shared_desc->mutex);
else
lockdep_assert_held(&shared_desc->spinlock);
}
#endif /* __LINUX_GPIO_SHARED_H */
|
