// SPDX-License-Identifier: GPL-2.0 /* * Simple kernel console driver for STM devices * Copyright (c) 2014, Intel Corporation. * * STM console will send kernel messages over STM devices to a trace host. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/console.h> #include <linux/slab.h> #include <linux/stm.h> static int stm_console_link(struct stm_source_data *data); static void stm_console_unlink(struct stm_source_data *data); static struct stm_console { struct stm_source_data data; struct console console; } stm_console = { .data = { .name = "console", .nr_chans = 1, .link = stm_console_link, .unlink = stm_console_unlink, }, }; static void stm_console_write(struct console *con, const char *buf, unsigned len) { struct stm_console *sc = container_of(con, struct stm_console, console); stm_source_write(&sc->data, 0, buf, len); } static int stm_console_link(struct stm_source_data *data) { struct stm_console *sc = container_of(data, struct stm_console, data); strcpy(sc->console.name, "stm_console"); sc->console.write = stm_console_write; sc->console.flags = CON_ENABLED | CON_PRINTBUFFER; register_console(&sc->console); return 0; } static void stm_console_unlink(struct stm_source_data *data) { struct stm_console *sc = container_of(data, struct stm_console, data); unregister_console(&sc->console); } static int stm_console_init(void) { return stm_source_register_device(NULL, &stm_console.data); } static void stm_console_exit(void) { stm_source_unregister_device(&stm_console.data); } module_init(stm_console_init); module_exit(stm_console_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("stm_console driver"); MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");