MeowOS Dev
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76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/* fbpantest.c — empirically find the ioctl that pans /dev/fb0 by yoffset.
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* Confirmed already: fb0 is 480x720 RGB565, yres_virtual=1440 (double),
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* yoffset selects the displayed buffer, ypanstep=1. We try candidate ioctls
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* that set yoffset to the OTHER buffer and read yoffset back; whichever
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* changes it is the pan mechanism. We restore yoffset immediately.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <stdint.h>
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#define GETV 0x4600
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static int get_info(int fd, uint32_t *yoff, uint32_t *yres) {
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unsigned char v[160];
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memset(v, 0, sizeof v);
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if (ioctl(fd, GETV, v) < 0) return -1;
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*yres = *(uint32_t*)(v + 4);
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*yoff = *(uint32_t*)(v + 20);
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return 0;
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}
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static void write_yoffset_to(int fd, uint32_t cmd, uint32_t yoffset) {
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unsigned char v[160];
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memset(v, 0, sizeof v);
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if (ioctl(fd, GETV, v) < 0) return;
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/* modify only the offset fields, keep everything else */
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*(uint32_t*)(v + 16) = 0;
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*(uint32_t*)(v + 20) = yoffset;
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ioctl(fd, cmd, v);
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}
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int main(void) {
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int fd = open("/dev/fb0", O_RDWR);
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if (fd < 0) { perror("open /dev/fb0"); return 1; }
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uint32_t orig = 0, yres = 0;
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if (get_info(fd, &orig, &yres) < 0) { perror("getvar"); return 1; }
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uint32_t target = (orig < yres) ? yres : 0;
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printf("orig yoffset=%u yres=%u target(other buf)=%u\n", orig, yres, target);
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unsigned tests[] = { 0x4601, 0x4606 }; /* PUT_VSCREENINFO, PAN_DISPLAY(nr 0x06) */
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for (unsigned i = 0; i < sizeof(tests)/sizeof(tests[0]); i++) {
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uint32_t cmd = tests[i];
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write_yoffset_to(fd, cmd, target);
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uint32_t now = 0, tmp = 0;
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int ok = get_info(fd, &now, &tmp);
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printf(" cmd=0x%04X -> yoffset=%u (target %u) %s\n",
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cmd, now, target, (ok==0 && now==target) ? "*** PAN WORKS ***" : "");
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/* restore */
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if (ok == 0 && now == target) {
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write_yoffset_to(fd, cmd, orig);
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uint32_t back = 0;
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get_info(fd, &back, &tmp);
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printf(" restored to yoffset=%u\n", back);
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break;
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}
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}
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/* also probe FBIOBLANK candidate 0x4611 and 0x4603 just to report which blanks */
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errno = 0;
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int b1 = ioctl(fd, 0x4603, 5);
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int e1 = errno; errno = 0;
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int b2 = ioctl(fd, 0x4611, 5);
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int e2 = errno;
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printf(" blank 0x4603(5) r=%d errno=%d ; 0x4611(5) r=%d errno=%d\n", b1, e1, b2, e2);
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/* ensure unblanked back to 0 regardless */
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ioctl(fd, 0x4611, 0); /* unblank (works per launcher) */
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close(fd);
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return 0;
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}
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