Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <irq_kern.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <os.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <sigio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) /* Protected by sigio_lock() called from write_sigio_workaround */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) static int sigio_irq_fd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static irqreturn_t sigio_interrupt(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	os_read_file(sigio_irq_fd, &c, sizeof(c));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) int write_sigio_irq(int fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 			     0, "write sigio", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		printk(KERN_ERR "write_sigio_irq : um_request_irq failed, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		       "err = %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	sigio_irq_fd = fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* These are called from os-Linux/sigio.c to protect its pollfds arrays. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static DEFINE_MUTEX(sigio_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) void sigio_lock(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	mutex_lock(&sigio_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) void sigio_unlock(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	mutex_unlock(&sigio_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }