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 74 tasklet_enable(struct tasklet_struct *t) 75 { 76 atomic_dec(&t->count); 77 } 78 79 static inline void 80 tasklet_disable(struct tasklet_struct *t) 81 { 82 atomic_inc(&t->count); 83 } 84 85 #endif /* _LINUX_INTERRUPT_H_ */ 86