linux/arch/alpha/kernel/rtc.c

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License cleanup: add SPDX GPL-2.0 license identifier to files with no license Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:07:57 +08:00
// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/alpha/kernel/rtc.c
*
* Copyright (C) 1991, 1992, 1995, 1999, 2000 Linus Torvalds
*
* This file contains date handling.
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mc146818rtc.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include "proto.h"
/*
* Support for the RTC device.
*
* We don't want to use the rtc-cmos driver, because we don't want to support
* alarms, as that would be indistinguishable from timer interrupts.
*
* Further, generic code is really, really tied to a 1900 epoch. This is
* true in __get_rtc_time as well as the users of struct rtc_time e.g.
* rtc_tm_to_time. Thankfully all of the other epochs in use are later
* than 1900, and so it's easy to adjust.
*/
static unsigned long rtc_epoch;
static int __init
specifiy_epoch(char *str)
{
unsigned long epoch = simple_strtoul(str, NULL, 0);
if (epoch < 1900)
printk("Ignoring invalid user specified epoch %lu\n", epoch);
else
rtc_epoch = epoch;
return 1;
}
__setup("epoch=", specifiy_epoch);
static void __init
init_rtc_epoch(void)
{
int epoch, year, ctrl;
if (rtc_epoch != 0) {
/* The epoch was specified on the command-line. */
return;
}
/* Detect the epoch in use on this computer. */
ctrl = CMOS_READ(RTC_CONTROL);
year = CMOS_READ(RTC_YEAR);
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
year = bcd2bin(year);
/* PC-like is standard; used for year >= 70 */
epoch = 1900;
if (year < 20) {
epoch = 2000;
} else if (year >= 20 && year < 48) {
/* NT epoch */
epoch = 1980;
} else if (year >= 48 && year < 70) {
/* Digital UNIX epoch */
epoch = 1952;
}
rtc_epoch = epoch;
printk(KERN_INFO "Using epoch %d for rtc year %d\n", epoch, year);
}
static int
alpha_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
mc146818_get_time(tm);
/* Adjust for non-default epochs. It's easier to depend on the
generic __get_rtc_time and adjust the epoch here than create
a copy of __get_rtc_time with the edits we need. */
if (rtc_epoch != 1900) {
int year = tm->tm_year;
/* Undo the century adjustment made in __get_rtc_time. */
if (year >= 100)
year -= 100;
year += rtc_epoch - 1900;
/* Redo the century adjustment with the epoch in place. */
if (year <= 69)
year += 100;
tm->tm_year = year;
}
return 0;
}
static int
alpha_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct rtc_time xtm;
if (rtc_epoch != 1900) {
xtm = *tm;
xtm.tm_year -= rtc_epoch - 1900;
tm = &xtm;
}
return mc146818_set_time(tm);
}
static int
alpha_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case RTC_EPOCH_READ:
return put_user(rtc_epoch, (unsigned long __user *)arg);
case RTC_EPOCH_SET:
if (arg < 1900)
return -EINVAL;
rtc_epoch = arg;
return 0;
default:
return -ENOIOCTLCMD;
}
}
static const struct rtc_class_ops alpha_rtc_ops = {
.read_time = alpha_rtc_read_time,
.set_time = alpha_rtc_set_time,
.ioctl = alpha_rtc_ioctl,
};
/*
* Similarly, except do the actual CMOS access on the boot cpu only.
* This requires marshalling the data across an interprocessor call.
*/
#if defined(CONFIG_SMP) && \
(defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_MARVEL))
# define HAVE_REMOTE_RTC 1
union remote_data {
struct rtc_time *tm;
long retval;
};
static void
do_remote_read(void *data)
{
union remote_data *x = data;
x->retval = alpha_rtc_read_time(NULL, x->tm);
}
static int
remote_read_time(struct device *dev, struct rtc_time *tm)
{
union remote_data x;
if (smp_processor_id() != boot_cpuid) {
x.tm = tm;
smp_call_function_single(boot_cpuid, do_remote_read, &x, 1);
return x.retval;
}
return alpha_rtc_read_time(NULL, tm);
}
static void
do_remote_set(void *data)
{
union remote_data *x = data;
x->retval = alpha_rtc_set_time(NULL, x->tm);
}
static int
remote_set_time(struct device *dev, struct rtc_time *tm)
{
union remote_data x;
if (smp_processor_id() != boot_cpuid) {
x.tm = tm;
smp_call_function_single(boot_cpuid, do_remote_set, &x, 1);
return x.retval;
}
return alpha_rtc_set_time(NULL, tm);
}
static const struct rtc_class_ops remote_rtc_ops = {
.read_time = remote_read_time,
.set_time = remote_set_time,
.ioctl = alpha_rtc_ioctl,
};
#endif
static int __init
alpha_rtc_init(void)
{
struct platform_device *pdev;
struct rtc_device *rtc;
init_rtc_epoch();
pdev = platform_device_register_simple("rtc-alpha", -1, NULL, 0);
rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
platform_set_drvdata(pdev, rtc);
rtc->ops = &alpha_rtc_ops;
#ifdef HAVE_REMOTE_RTC
if (alpha_mv.rtc_boot_cpu_only)
rtc->ops = &remote_rtc_ops;
#endif
return rtc_register_device(rtc);
}
device_initcall(alpha_rtc_init);