1 /*
2 * Copyright (c) 2017-2020 François Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _LINUX_INTERRUPT_H_
28 #define _LINUX_INTERRUPT_H_
29
30 #include <linux/kernel.h>
31 #include <linux/bitops.h>
32 #include <linux/preempt.h>
33 #include <linux/cpumask.h>
34 #include <linux/irqreturn.h>
35 #include <linux/hardirq.h>
36 #include <linux/irqflags.h>
37 #include <linux/hrtimer.h>
38 #include <linux/kref.h>
39
40 #include <linux/atomic.h>
41
42 #define IRQF_SHARED 0x00000080
43
44 struct tasklet_struct {
45 unsigned long state;
46 void (*func)(unsigned long);
47 unsigned long data;
48 atomic_t count;
49 };
50
51 enum {
52 TASKLET_STATE_SCHED,
53 TASKLET_STATE_RUN,
54 TASKLET_IS_DYING
55 };
56
57 typedef irqreturn_t (*irq_handler_t)(int, void *);
58
59 int request_irq(unsigned int irq, irq_handler_t handler,
60 unsigned long flags, const char *name, void *dev);
61
62 void free_irq(unsigned int irq, void *dev_id);
63
64 void disable_irq(unsigned int irq);
65 void enable_irq(unsigned int irq);
66
67 void tasklet_init(struct tasklet_struct *t,
68 void (*func)(unsigned long), unsigned long data);
69 void tasklet_schedule(struct tasklet_struct *t);
70 void tasklet_hi_schedule(struct tasklet_struct *t);
71 void tasklet_kill(struct tasklet_struct *t);
72
73 static inline void
tasklet_enable(struct tasklet_struct * t)74 tasklet_enable(struct tasklet_struct *t)
75 {
76 atomic_dec(&t->count);
77 }
78
79 static inline void
tasklet_disable(struct tasklet_struct * t)80 tasklet_disable(struct tasklet_struct *t)
81 {
82 atomic_inc(&t->count);
83 }
84
85 #endif /* _LINUX_INTERRUPT_H_ */
86