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      1 /*
      2  * v4l-test: Test environment for Video For Linux Two API
      3  *
      4  *  3 Apr 2009  0.2  Added camera enabling through
      5  *                   /sys/devices/platform/eeepc/camera
      6  * 18 Dec 2008  0.1  First release
      7  *
      8  * Written by Mrton Nmeth <nm127 (at) freemail.hu>
      9  * Released under GPL
     10  */
     11 
     12 #include <stdio.h>
     13 #include <sys/types.h>
     14 #include <sys/stat.h>
     15 #include <fcntl.h>
     16 #include <unistd.h>
     17 #include <sys/ioctl.h>
     18 #include <errno.h>
     19 #include <string.h>
     20 #include <unistd.h>
     21 
     22 #include "dev_video.h"
     23 
     24 #define DEV_VIDEO_STATE_NORMAL		0
     25 #define DEV_VIDEO_STATE_ASUS		1
     26 #define DEV_VIDEO_STATE_EEEPC		2
     27 
     28 static int f;
     29 static int dev_video_state;
     30 
     31 static int try_ASUS_camera(char *path, char *value)
     32 {
     33 	int ASUS_camera;
     34 	size_t s;
     35 	int ret;
     36 
     37 	ASUS_camera = open(path, O_WRONLY);
     38 	if (ASUS_camera < 0) {
     39 		fprintf(stderr, "Cannot open %s: %s\n", path, strerror(errno));
     40 		return ASUS_camera;
     41 	}
     42 	s = write(ASUS_camera, value, 1);
     43 	ret = close(ASUS_camera);
     44 	if (s != 1) {
     45 		return -1;
     46 	}
     47 	if (ret < 0) {
     48 		perror("Cannot close ASUS camera");
     49 		return ret;
     50 	}
     51 
     52 	sleep(1);
     53 
     54 	f = open("/dev/video0", O_RDWR);
     55 	if (f < 0) {
     56 		perror("Cannot open /dev/video0");
     57 		return f;
     58 	}
     59 	dev_video_state = DEV_VIDEO_STATE_ASUS;
     60 
     61 	return f;
     62 }
     63 
     64 int open_video()
     65 {
     66 	int error = 0;
     67 
     68 	fflush(stdout);
     69 
     70 	f = open("/dev/video0", O_RDWR);
     71 	if (f < 0) {
     72 		perror("Cannot open /dev/video0");
     73 		fprintf(stderr, "Retrying with ASUS camera...\n");
     74 		f = try_ASUS_camera("/proc/acpi/asus/camera", "1");
     75 		if (f < 0) {
     76 			f = try_ASUS_camera
     77 			    ("/sys/devices/platform/eeepc/camera", "1");
     78 			if (f < 0) {
     79 				error = 1;
     80 			} else {
     81 				dev_video_state = DEV_VIDEO_STATE_EEEPC;
     82 			}
     83 		} else {
     84 			dev_video_state = DEV_VIDEO_STATE_ASUS;
     85 		}
     86 	} else {
     87 		dev_video_state = DEV_VIDEO_STATE_NORMAL;
     88 	}
     89 	return error;
     90 }
     91 
     92 int close_video()
     93 {
     94 	int ret;
     95 
     96 	fflush(stdout);
     97 
     98 	ret = close(f);
     99 	f = 0;
    100 	if (ret < 0) {
    101 		perror("Cannot close");
    102 		return 1;
    103 	}
    104 	switch (dev_video_state) {
    105 	case DEV_VIDEO_STATE_NORMAL:
    106 		break;
    107 	case DEV_VIDEO_STATE_ASUS:
    108 		try_ASUS_camera("/proc/acpi/asus/camera", "0");
    109 		break;
    110 	case DEV_VIDEO_STATE_EEEPC:
    111 		try_ASUS_camera("/sys/devices/platform/eeepc/camera", "0");
    112 		break;
    113 	}
    114 
    115 	return 0;
    116 }
    117 
    118 int get_video_fd()
    119 {
    120 	return f;
    121 }
    122