1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Simple kernel console driver for STM devices
 4 * Copyright (c) 2014, Intel Corporation.
 
 
 
 
 
 
 
 
 
 5 *
 6 * STM console will send kernel messages over STM devices to a trace host.
 7 */
 8
 9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/console.h>
12#include <linux/slab.h>
13#include <linux/stm.h>
14
15static int stm_console_link(struct stm_source_data *data);
16static void stm_console_unlink(struct stm_source_data *data);
17
18static struct stm_console {
19	struct stm_source_data	data;
20	struct console		console;
21} stm_console = {
22	.data	= {
23		.name		= "console",
24		.nr_chans	= 1,
25		.link		= stm_console_link,
26		.unlink		= stm_console_unlink,
27	},
28};
29
30static void
31stm_console_write(struct console *con, const char *buf, unsigned len)
32{
33	struct stm_console *sc = container_of(con, struct stm_console, console);
34
35	stm_source_write(&sc->data, 0, buf, len);
36}
37
38static int stm_console_link(struct stm_source_data *data)
39{
40	struct stm_console *sc = container_of(data, struct stm_console, data);
41
42	strcpy(sc->console.name, "stm_console");
43	sc->console.write = stm_console_write;
44	sc->console.flags = CON_ENABLED | CON_PRINTBUFFER;
45	register_console(&sc->console);
46
47	return 0;
48}
49
50static void stm_console_unlink(struct stm_source_data *data)
51{
52	struct stm_console *sc = container_of(data, struct stm_console, data);
53
54	unregister_console(&sc->console);
55}
56
57static int stm_console_init(void)
58{
59	return stm_source_register_device(NULL, &stm_console.data);
60}
61
62static void stm_console_exit(void)
63{
64	stm_source_unregister_device(&stm_console.data);
65}
66
67module_init(stm_console_init);
68module_exit(stm_console_exit);
69
70MODULE_LICENSE("GPL v2");
71MODULE_DESCRIPTION("stm_console driver");
72MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");

 
 1/*
 2 * Simple kernel console driver for STM devices
 3 * Copyright (c) 2014, Intel Corporation.
 4 *
 5 * This program is free software; you can redistribute it and/or modify it
 6 * under the terms and conditions of the GNU General Public License,
 7 * version 2, as published by the Free Software Foundation.
 8 *
 9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12 * more details.
13 *
14 * STM console will send kernel messages over STM devices to a trace host.
15 */
16
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/console.h>
20#include <linux/slab.h>
21#include <linux/stm.h>
22
23static int stm_console_link(struct stm_source_data *data);
24static void stm_console_unlink(struct stm_source_data *data);
25
26static struct stm_console {
27	struct stm_source_data	data;
28	struct console		console;
29} stm_console = {
30	.data	= {
31		.name		= "console",
32		.nr_chans	= 1,
33		.link		= stm_console_link,
34		.unlink		= stm_console_unlink,
35	},
36};
37
38static void
39stm_console_write(struct console *con, const char *buf, unsigned len)
40{
41	struct stm_console *sc = container_of(con, struct stm_console, console);
42
43	stm_source_write(&sc->data, 0, buf, len);
44}
45
46static int stm_console_link(struct stm_source_data *data)
47{
48	struct stm_console *sc = container_of(data, struct stm_console, data);
49
50	strcpy(sc->console.name, "stm_console");
51	sc->console.write = stm_console_write;
52	sc->console.flags = CON_ENABLED | CON_PRINTBUFFER;
53	register_console(&sc->console);
54
55	return 0;
56}
57
58static void stm_console_unlink(struct stm_source_data *data)
59{
60	struct stm_console *sc = container_of(data, struct stm_console, data);
61
62	unregister_console(&sc->console);
63}
64
65static int stm_console_init(void)
66{
67	return stm_source_register_device(NULL, &stm_console.data);
68}
69
70static void stm_console_exit(void)
71{
72	stm_source_unregister_device(&stm_console.data);
73}
74
75module_init(stm_console_init);
76module_exit(stm_console_exit);
77
78MODULE_LICENSE("GPL v2");
79MODULE_DESCRIPTION("stm_console driver");
80MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");