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 <stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include "chan_user.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <os.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) /* This address is used only as a unique identifier */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) static int null_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static void *null_init(char *str, int device, const struct chan_opts *opts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	return &null_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static int null_open(int input, int output, int primary, void *d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 		     char **dev_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	*dev_out = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	fd = open(DEV_NULL, O_RDWR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	return (fd < 0) ? -errno : fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static int null_read(int fd, char *c_out, void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void null_free(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) const struct chan_ops null_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	.type		= "null",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	.init		= null_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	.open		= null_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	.close		= generic_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	.read		= null_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	.write		= generic_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	.console_write	= generic_console_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	.window_size	= generic_window_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	.free		= null_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	.winch		= 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) };