v4.19.13 snapshot.
diff --git a/drivers/rtc/rtc-proc.c b/drivers/rtc/rtc-proc.c
new file mode 100644
index 0000000..a9dd921
--- /dev/null
+++ b/drivers/rtc/rtc-proc.c
@@ -0,0 +1,121 @@
+/*
+ * RTC subsystem, proc interface
+ *
+ * Copyright (C) 2005-06 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * based on arch/arm/common/rtctime.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include "rtc-core.h"
+
+#define NAME_SIZE 10
+
+#if defined(CONFIG_RTC_HCTOSYS_DEVICE)
+static bool is_rtc_hctosys(struct rtc_device *rtc)
+{
+ int size;
+ char name[NAME_SIZE];
+
+ size = scnprintf(name, NAME_SIZE, "rtc%d", rtc->id);
+ if (size > NAME_SIZE)
+ return false;
+
+ return !strncmp(name, CONFIG_RTC_HCTOSYS_DEVICE, NAME_SIZE);
+}
+#else
+static bool is_rtc_hctosys(struct rtc_device *rtc)
+{
+ return (rtc->id == 0);
+}
+#endif
+
+static int rtc_proc_show(struct seq_file *seq, void *offset)
+{
+ int err;
+ struct rtc_device *rtc = seq->private;
+ const struct rtc_class_ops *ops = rtc->ops;
+ struct rtc_wkalrm alrm;
+ struct rtc_time tm;
+
+ err = rtc_read_time(rtc, &tm);
+ if (err == 0) {
+ seq_printf(seq,
+ "rtc_time\t: %02d:%02d:%02d\n"
+ "rtc_date\t: %04d-%02d-%02d\n",
+ tm.tm_hour, tm.tm_min, tm.tm_sec,
+ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+ }
+
+ err = rtc_read_alarm(rtc, &alrm);
+ if (err == 0) {
+ seq_printf(seq, "alrm_time\t: ");
+ if ((unsigned int)alrm.time.tm_hour <= 24)
+ seq_printf(seq, "%02d:", alrm.time.tm_hour);
+ else
+ seq_printf(seq, "**:");
+ if ((unsigned int)alrm.time.tm_min <= 59)
+ seq_printf(seq, "%02d:", alrm.time.tm_min);
+ else
+ seq_printf(seq, "**:");
+ if ((unsigned int)alrm.time.tm_sec <= 59)
+ seq_printf(seq, "%02d\n", alrm.time.tm_sec);
+ else
+ seq_printf(seq, "**\n");
+
+ seq_printf(seq, "alrm_date\t: ");
+ if ((unsigned int)alrm.time.tm_year <= 200)
+ seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
+ else
+ seq_printf(seq, "****-");
+ if ((unsigned int)alrm.time.tm_mon <= 11)
+ seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
+ else
+ seq_printf(seq, "**-");
+ if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
+ seq_printf(seq, "%02d\n", alrm.time.tm_mday);
+ else
+ seq_printf(seq, "**\n");
+ seq_printf(seq, "alarm_IRQ\t: %s\n",
+ alrm.enabled ? "yes" : "no");
+ seq_printf(seq, "alrm_pending\t: %s\n",
+ alrm.pending ? "yes" : "no");
+ seq_printf(seq, "update IRQ enabled\t: %s\n",
+ (rtc->uie_rtctimer.enabled) ? "yes" : "no");
+ seq_printf(seq, "periodic IRQ enabled\t: %s\n",
+ (rtc->pie_enabled) ? "yes" : "no");
+ seq_printf(seq, "periodic IRQ frequency\t: %d\n",
+ rtc->irq_freq);
+ seq_printf(seq, "max user IRQ frequency\t: %d\n",
+ rtc->max_user_freq);
+ }
+
+ seq_printf(seq, "24hr\t\t: yes\n");
+
+ if (ops->proc)
+ ops->proc(rtc->dev.parent, seq);
+
+ return 0;
+}
+
+void rtc_proc_add_device(struct rtc_device *rtc)
+{
+ if (is_rtc_hctosys(rtc))
+ proc_create_single_data("driver/rtc", 0, NULL, rtc_proc_show,
+ rtc);
+}
+
+void rtc_proc_del_device(struct rtc_device *rtc)
+{
+ if (is_rtc_hctosys(rtc))
+ remove_proc_entry("driver/rtc", NULL);
+}