From ea652045bb38651d99bcc53972a524f602c3b306 Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Sat, 14 Jul 2018 11:46:12 +0800
Subject: Added a simple tool to create a fake sysfs backlight interface that
 invokes external commands. Some changes in the utility module to accomodate
 the new tool. Added an option to watch ALS readings.

---
 tools/fakebl.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 tools/fakebl.c

(limited to 'tools')

diff --git a/tools/fakebl.c b/tools/fakebl.c
new file mode 100644
index 0000000..dc2d9b9
--- /dev/null
+++ b/tools/fakebl.c
@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+char *path;
+char *brpath;
+char *mbrpath;
+char *cmd;
+char *rcmd;
+FILE *brf;
+int setup_dir()
+{
+	int r=mkdir(path,0755);
+	brpath=malloc(strlen(path)+12);
+	mbrpath=malloc(strlen(path)+16);
+	strcpy(brpath,path);
+	strcpy(mbrpath,path);
+	strcat(brpath,"/brightness");
+	strcat(mbrpath,"/max_brightness");
+	r|=mkfifo(brpath,0666);
+	FILE* mbrf=fopen(mbrpath,"w");
+	r|=(mbrf==NULL);
+	if(mbrf)fputs("100\n",mbrf);
+	fclose(mbrf);
+	return r;
+}
+void remove_dir()
+{
+	unlink(brpath);
+	unlink(mbrpath);
+	rmdir(path);
+	free(brpath);
+	free(mbrpath);
+}
+void usage(char* s)
+{
+	printf("usage: %s -c <cmd> -p <path>\n",s);
+	_exit(1);
+}
+int main(int argc,char **argv)
+{
+	if(argc<5)usage(argv[0]);
+	for(int i=1;i<argc-1;++i)
+	{
+		if(!strcmp(argv[i],"-c"))cmd=strdup(argv[i+1]);
+		if(!strcmp(argv[i],"-p"))path=strdup(argv[i+1]);
+	}
+	if(!cmd||!path)
+	{
+		if(cmd)free(cmd);
+		if(path)free(path);
+		usage(argv[0]);
+	}
+	if(setup_dir())return puts("error setting up fake brightness interface"),1;
+	rcmd=malloc(strlen(cmd)+16);
+	while((brf=fopen(brpath,"r")))
+	{
+		char dat[64],*eptr;
+		eptr=fgets(dat,64,brf);//unused return value
+		int v=strtol(dat,&eptr,10),r;
+		if(eptr==dat)break;
+		snprintf(rcmd,strlen(cmd)+16,cmd,v);
+		if((r=system(rcmd)))
+		printf("%s returned %d\n",rcmd,r);
+		fclose(brf);
+	}
+	remove_dir();
+	free(path);
+	free(cmd);
+	free(rcmd);
+	return 0;
+}
-- 
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