From: Ben Harris <bjh21@bjh21.me.uk>
Date: Sat, 24 Nov 2018 11:55:35 +0000 (+0000)
Subject: Crude sysfs-compatible output mode.
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=8ac5c890317756f3329fcb5086fded4d5340a622;p=clunk.git

Crude sysfs-compatible output mode.

For pre-libgpiod systems.
---

diff --git a/clunk.c b/clunk.c
index 6199b54..38a1f39 100644
--- a/clunk.c
+++ b/clunk.c
@@ -78,6 +78,19 @@ libgpiod_out(bool state)
 }
 #endif /* WITH_LIBGPIOD */
 
+static int sysfsfd;
+
+static void sysfs_out(bool state)
+{
+	ssize_t ret;
+
+	ret = pwrite(sysfsfd, state ? "1\n" : "0\n", 2, 0);
+	if (ret == -1)
+		err(1, "write to sysfs");
+	if (ret != 2)
+		errx(1, "short write to sysfs");
+}
+
 static void (*outfn)(bool) = &dummy_out;
 
 static void
@@ -207,6 +220,16 @@ init_libgpiod(char const *gpio_name)
 }
 #endif /* WITH_LIBGPIOD */
 
+static void
+init_sysfs(char const *path)
+{
+
+	sysfsfd = open(path, O_WRONLY);
+	if (sysfsfd == -1)
+		err(1, "%s", path);
+	outfn = &sysfs_out;
+}
+
 static void
 init(int argc, char **argv)
 {
@@ -232,7 +255,7 @@ init(int argc, char **argv)
 	if (timer_create(CLOCK_REALTIME, &sev, &main_timer) != 0)
 		err(1, "timer_create");
 
-	while ((opt = getopt(argc, argv, "f:s:"
+	while ((opt = getopt(argc, argv, "f:s:Y:"
 #ifdef WITH_LIBGPIOD
 			     "G:"
 #endif /* WITH_LIBGPIOD */
@@ -249,6 +272,9 @@ init(int argc, char **argv)
 			init_libgpiod(optarg);
 			break;
 #endif /* WITH_LIBGPIOD */
+		case 'Y':
+			init_sysfs(optarg);
+			break;
 		}
 	}
 	if (statefile != NULL)