tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef __LINUX_GPIO_SHARED_H
4#define __LINUX_GPIO_SHARED_H
5
6#include <linux/cleanup.h>
7#include <linux/lockdep.h>
8#include <linux/mutex.h>
9#include <linux/spinlock.h>
10
11struct gpio_device;
12struct gpio_desc;
13struct device;
14
15#if IS_ENABLED(CONFIG_GPIO_SHARED)
16
17int gpio_device_setup_shared(struct gpio_device *gdev);
18void gpio_device_teardown_shared(struct gpio_device *gdev);
19int gpio_shared_add_proxy_lookup(struct device *consumer, unsigned long lflags);
20
21#else
22
23static inline int gpio_device_setup_shared(struct gpio_device *gdev)
24{
25 return 0;
26}
27
28static inline void gpio_device_teardown_shared(struct gpio_device *gdev) { }
29
30static inline int gpio_shared_add_proxy_lookup(struct device *consumer,
31 unsigned long lflags)
32{
33 return 0;
34}
35
36#endif /* CONFIG_GPIO_SHARED */
37
38struct gpio_shared_desc {
39 struct gpio_desc *desc;
40 bool can_sleep;
41 unsigned long cfg;
42 unsigned int usecnt;
43 unsigned int highcnt;
44 union {
45 struct mutex mutex;
46 spinlock_t spinlock;
47 };
48};
49
50struct gpio_shared_desc *devm_gpiod_shared_get(struct device *dev);
51
52DEFINE_LOCK_GUARD_1(gpio_shared_desc_lock, struct gpio_shared_desc,
53 if (_T->lock->can_sleep)
54 mutex_lock(&_T->lock->mutex);
55 else
56 spin_lock_irqsave(&_T->lock->spinlock, _T->flags),
57 if (_T->lock->can_sleep)
58 mutex_unlock(&_T->lock->mutex);
59 else
60 spin_unlock_irqrestore(&_T->lock->spinlock, _T->flags),
61 unsigned long flags)
62
63static inline void gpio_shared_lockdep_assert(struct gpio_shared_desc *shared_desc)
64{
65 if (shared_desc->can_sleep)
66 lockdep_assert_held(&shared_desc->mutex);
67 else
68 lockdep_assert_held(&shared_desc->spinlock);
69}
70
71#endif /* __LINUX_GPIO_SHARED_H */