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https://github.com/edk2-porting/linux-next.git
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e3e5a3d3da
This is a simple stm_source class device driver (kernelspace stm trace source) that registers a console and sends kernel messages over STM devices. Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* Simple kernel console driver for STM devices
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* Copyright (c) 2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* STM console will send kernel messages over STM devices to a trace host.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/slab.h>
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#include <linux/stm.h>
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static int stm_console_link(struct stm_source_data *data);
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static void stm_console_unlink(struct stm_source_data *data);
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static struct stm_console {
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struct stm_source_data data;
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struct console console;
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} stm_console = {
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.data = {
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.name = "console",
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.nr_chans = 1,
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.link = stm_console_link,
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.unlink = stm_console_unlink,
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},
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};
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static void
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stm_console_write(struct console *con, const char *buf, unsigned len)
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{
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struct stm_console *sc = container_of(con, struct stm_console, console);
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stm_source_write(&sc->data, 0, buf, len);
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}
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static int stm_console_link(struct stm_source_data *data)
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{
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struct stm_console *sc = container_of(data, struct stm_console, data);
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strcpy(sc->console.name, "stm_console");
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sc->console.write = stm_console_write;
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sc->console.flags = CON_ENABLED | CON_PRINTBUFFER;
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register_console(&sc->console);
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return 0;
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}
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static void stm_console_unlink(struct stm_source_data *data)
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{
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struct stm_console *sc = container_of(data, struct stm_console, data);
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unregister_console(&sc->console);
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}
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static int stm_console_init(void)
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{
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return stm_source_register_device(NULL, &stm_console.data);
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}
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static void stm_console_exit(void)
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{
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stm_source_unregister_device(&stm_console.data);
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}
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module_init(stm_console_init);
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module_exit(stm_console_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("stm_console driver");
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MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
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