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From: Andrej Picej <andrej.picej@norik.com>
Date: Tue, 11 Jul 2023 10:42:49 +0200
Subject: [PATCH] hwclock: add get/set parameters option
In kernel 5.16 special ioctls were introduced to get/set RTC parameters.
Add option to get/set parameters into busybox version of hwclock.
Implementation is similar to the one already used in linux-utils hwclock
tool.
Example of parameter get use:
$ hwclock -g 2
The RTC parameter 0x2 is set to 0x2.
$ hwclock --param-get bsm
The RTC parameter 0x2 is set to 0x2.
Example of parameter set use:
$ hwclock -p 2=1
The RTC parameter 0x2 will be set to 0x1.
$ hwclock -p bsm=2
The RTC parameter 0x2 will be set to 0x2.
function old new delta
hwclock_main 298 576 +278
.rodata 105231 105400 +169
packed_usage 34541 34576 +35
static.hwclock_longopts 60 84 +24
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 506/0) Total: 506 bytes
Upstream-Status: Backport [master]
Signed-off-by: Andrej Picej <andrej.picej@norik.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
(cherry picked from commit d70256a5c719439cc6fab6a4571c1bb46178e4c7)
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
---
include/rtc_.h | 18 +++++++++
util-linux/hwclock.c | 87 +++++++++++++++++++++++++++++++++++++++++---
2 files changed, 100 insertions(+), 5 deletions(-)
diff --git a/include/rtc_.h b/include/rtc_.h
index 24ff536..7829660 100644
--- a/include/rtc_.h
+++ b/include/rtc_.h
@@ -46,6 +46,17 @@ struct linux_rtc_wkalrm {
struct linux_rtc_time time; /* time the alarm is set to */
};
+struct rtc_param {
+ uint64_t param;
+ union {
+ uint64_t uvalue;
+ int64_t svalue;
+ uint64_t ptr;
+ };
+ uint32_t index;
+ uint32_t __pad;
+};
+
/*
* ioctl calls that are permitted to the /dev/rtc interface, if
* any of the RTC drivers are enabled.
@@ -71,12 +82,19 @@ struct linux_rtc_wkalrm {
#define RTC_WKALM_SET _IOW('p', 0x0f, struct linux_rtc_wkalrm)/* Set wakeup alarm*/
#define RTC_WKALM_RD _IOR('p', 0x10, struct linux_rtc_wkalrm)/* Get wakeup alarm*/
+#define RTC_PARAM_GET _IOW('p', 0x13, struct rtc_param) /* Get parameter */
+#define RTC_PARAM_SET _IOW('p', 0x14, struct rtc_param) /* Set parameter */
+
/* interrupt flags */
#define RTC_IRQF 0x80 /* any of the following is active */
#define RTC_PF 0x40
#define RTC_AF 0x20
#define RTC_UF 0x10
+#define RTC_PARAM_FEATURES 0
+#define RTC_PARAM_CORRECTION 1
+#define RTC_PARAM_BACKUP_SWITCH_MODE 2
+
POP_SAVED_FUNCTION_VISIBILITY
#endif
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index 723b095..0101db7 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -320,6 +320,70 @@ static void from_sys_clock(const char **pp_rtcname, int utc)
close(rtc);
}
+static uint64_t resolve_rtc_param_alias(const char *alias)
+{
+ int n;
+
+ BUILD_BUG_ON(RTC_PARAM_FEATURES != 0
+ || RTC_PARAM_CORRECTION != 1
+ || RTC_PARAM_BACKUP_SWITCH_MODE != 2
+ );
+ n = index_in_strings(
+ "features" "\0"
+ "correction" "\0"
+ "bsm" "\0"
+ , alias);
+ if (n >= 0)
+ return n;
+ return xstrtoull(alias, 0);
+}
+
+static void get_rtc_param(const char **pp_rtcname, const char *rtc_param)
+{
+ int rtc;
+ struct rtc_param param;
+
+ param.param = resolve_rtc_param_alias(rtc_param);
+
+ rtc = rtc_xopen(pp_rtcname, O_RDONLY);
+
+ xioctl(rtc, RTC_PARAM_GET, &param);
+
+ printf("The RTC parameter 0x%llx is set to 0x%llx.\n",
+ (unsigned long long) param.param, (unsigned long long) param.uvalue);
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(rtc);
+}
+
+static void set_rtc_param(const char **pp_rtcname, char *rtc_param)
+{
+ int rtc;
+ struct rtc_param param;
+ char *eq;
+
+ /* handle param name */
+ eq = strchr(rtc_param, '=');
+ if (!eq)
+ bb_error_msg_and_die("expected <param>=<value>");
+ *eq = '\0';
+ param.param = resolve_rtc_param_alias(rtc_param);
+ *eq = '=';
+
+ /* handle param value */
+ param.uvalue = xstrtoull(eq + 1, 0);
+
+ rtc = rtc_xopen(pp_rtcname, O_WRONLY);
+
+ printf("The RTC parameter 0x%llx will be set to 0x%llx.\n",
+ (unsigned long long) param.param, (unsigned long long) param.uvalue);
+
+ xioctl(rtc, RTC_PARAM_SET, &param);
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(rtc);
+}
+
// hwclock from util-linux 2.36.1
// hwclock [function] [option...]
//Functions:
@@ -346,10 +410,10 @@ static void from_sys_clock(const char **pp_rtcname, int utc)
//usage:#define hwclock_trivial_usage
//usage: IF_LONG_OPTS(
-//usage: "[-swul] [--systz] [-f DEV]"
+//usage: "[-swul] [--systz] [--param-get PARAM] [--param-set PARAM=VAL] [-f DEV]"
//usage: )
//usage: IF_NOT_LONG_OPTS(
-//usage: "[-swult] [-f DEV]"
+//usage: "[-swult] [-g PARAM] [-p PARAM=VAL] [-f DEV]"
//usage: )
//usage:#define hwclock_full_usage "\n\n"
//usage: "Show or set hardware clock (RTC)\n"
@@ -360,6 +424,8 @@ static void from_sys_clock(const char **pp_rtcname, int utc)
//usage: IF_LONG_OPTS(
//usage: "\n --systz Set in-kernel timezone, correct system time"
//usage: "\n if RTC is kept in local time"
+//usage: "\n --param-get PARAM Get RTC parameter"
+//usage: "\n --param-set PARAM=VAL Set RTC parameter"
//usage: )
//usage: "\n -f DEV Use specified device (e.g. /dev/rtc2)"
//usage: "\n -u Assume RTC is kept in UTC"
@@ -375,11 +441,14 @@ static void from_sys_clock(const char **pp_rtcname, int utc)
#define HWCLOCK_OPT_SYSTOHC 0x10
#define HWCLOCK_OPT_SYSTZ 0x20
#define HWCLOCK_OPT_RTCFILE 0x40
+#define HWCLOCK_OPT_PARAM_GET 0x80
+#define HWCLOCK_OPT_PARAM_SET 0x100
int hwclock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int hwclock_main(int argc UNUSED_PARAM, char **argv)
{
const char *rtcname = NULL;
+ char *param;
unsigned opt;
int utc;
#if ENABLE_LONG_OPTS
@@ -391,14 +460,18 @@ int hwclock_main(int argc UNUSED_PARAM, char **argv)
"systohc\0" No_argument "w"
"systz\0" No_argument "t" /* short opt is non-standard */
"rtc\0" Required_argument "f"
+ "param-get\0" Required_argument "g" /* short opt is non-standard */
+ "param-set\0" Required_argument "p" /* short opt is non-standard */
;
#endif
opt = getopt32long(argv,
- "^""lurswtf:v" /* -v is accepted and ignored */
+ "^""lurswtf:g:p:v" /* -v is accepted and ignored */
"\0"
- "r--wst:w--rst:s--wrt:t--rsw:l--u:u--l",
+ "r--wstgp:w--rstgp:s--wrtgp:t--rswgp:g--rswtp:p--rswtg:l--u:u--l",
hwclock_longopts,
- &rtcname
+ &rtcname,
+ &param,
+ &param
);
/* If -u or -l wasn't given, check if we are using utc */
@@ -413,6 +486,10 @@ int hwclock_main(int argc UNUSED_PARAM, char **argv)
from_sys_clock(&rtcname, utc);
else if (opt & HWCLOCK_OPT_SYSTZ)
set_kernel_timezone_and_clock(utc, NULL);
+ else if (opt & HWCLOCK_OPT_PARAM_GET)
+ get_rtc_param(&rtcname, param);
+ else if (opt & HWCLOCK_OPT_PARAM_SET)
+ set_rtc_param(&rtcname, param);
else
/* default HWCLOCK_OPT_SHOW */
show_clock(&rtcname, utc);
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