From 75a0c92cc0acde9e6378d158ad4cce0b7dbf268f Mon Sep 17 00:00:00 2001
From: philip <philip@FreeBSD.org>
Date: Sat, 21 Dec 2019 05:03:21 +0000
Subject: [PATCH] top: display battery capacity remaining

Submitted by: Antranig Vartanian <antranigv@freebsd.am>
Reviewed by:  imp, philip
Differential Revision:        https://reviews.freebsd.org/D22871
---
 usr.bin/top/display.c |  9 +++++++++
 usr.bin/top/display.h |  1 +
 usr.bin/top/machine.c | 16 ++++++++++++++++
 usr.bin/top/machine.h |  2 ++
 usr.bin/top/top.c     |  3 +++
 5 files changed, 31 insertions(+)

diff --git a/usr.bin/top/display.c b/usr.bin/top/display.c
index 38e6657401d0..5325dde87c24 100644
--- a/usr.bin/top/display.c
+++ b/usr.bin/top/display.c
@@ -1322,6 +1322,15 @@ i_uptime(struct timeval *bt, time_t *tod)
     }
 }
 
+void
+i_battery(int nbat, int batt)
+{
+
+	if (nbat > 0) {
+		printf("; battery: %d%%", batt);
+	}
+}
+
 #define SETUPBUFFER_MIN_SCREENWIDTH 80
 #define SETUPBUFFER_REQUIRED_ADDBUFSIZ 2
 
diff --git a/usr.bin/top/display.h b/usr.bin/top/display.h
index ff3ea8d3fe9a..76e88acb4d88 100644
--- a/usr.bin/top/display.h
+++ b/usr.bin/top/display.h
@@ -14,6 +14,7 @@ void	 i_header(const char *text);
 void	 display_header(int t);
 int		 display_init(struct statics *statics);
 void	 i_arc(int *stats);
+void	 i_battery(int nbat, int batt);
 void	 i_carc(int *stats);
 void	 i_cpustates(int *states);
 void	 i_loadave(int mpid, double *avenrun);
diff --git a/usr.bin/top/machine.c b/usr.bin/top/machine.c
index edfe3e659f13..b7186a6c2c2e 100644
--- a/usr.bin/top/machine.c
+++ b/usr.bin/top/machine.c
@@ -211,6 +211,10 @@ static long *pcpu_cp_old;
 static long *pcpu_cp_diff;
 static int *pcpu_cpu_states;
 
+/* Battery units and states */
+static int battery_units;
+static int battery_life;
+
 static int compare_swap(const void *a, const void *b);
 static int compare_jid(const void *a, const void *b);
 static int compare_pid(const void *a, const void *b);
@@ -373,6 +377,12 @@ machine_init(struct statics *statics)
 	pcpu_cpu_states = calloc(ncpus * CPUSTATES, sizeof(int));
 	statics->ncpus = ncpus;
 
+	/* Allocate state of battery units reported via ACPI. */
+	battery_units = 0;
+	size = sizeof(int);
+	sysctlbyname("hw.acpi.battery.units", &battery_units, &size, NULL, 0);
+	statics->nbatteries = battery_units;
+
 	update_layout();
 
 	/* all done! */
@@ -579,6 +589,12 @@ get_system_info(struct system_info *si)
 	} else {
 		si->boottime.tv_sec = -1;
 	}
+
+	battery_life = 0;
+	if (battery_units > 0) {
+		GETSYSCTL("hw.acpi.battery.life", battery_life);
+	}
+	si->battery = battery_life;
 }
 
 #define NOPROC	((void *)-1)
diff --git a/usr.bin/top/machine.h b/usr.bin/top/machine.h
index c3c7777d910e..c2616e9052e3 100644
--- a/usr.bin/top/machine.h
+++ b/usr.bin/top/machine.h
@@ -30,6 +30,7 @@ struct statics
     const char * const *carc_names;
     const char * const *swap_names;
     const char * const *order_names;
+    int nbatteries;
     int ncpus;
 };
 
@@ -50,6 +51,7 @@ struct system_info
     int    *carc;
     int    *swap;
     struct timeval boottime;
+    int    battery;
     int    ncpus;
 };
 
diff --git a/usr.bin/top/top.c b/usr.bin/top/top.c
index 3b317fab88b7..9853ecf914b0 100644
--- a/usr.bin/top/top.c
+++ b/usr.bin/top/top.c
@@ -619,6 +619,9 @@ main(int argc, const char *argv[])
 	(*d_loadave)(system_info.last_pid,
 		     system_info.load_avg);
 
+	/* display the battery info (if any) */
+	i_battery(statics.nbatteries, system_info.battery);
+
 	/* display the current time */
 	/* this method of getting the time SHOULD be fairly portable */
 	time(&curr_time);