Hello,
??? wrote:
hi,all
Here is a question I didn't make out, i wonder if anybody can figure
it out. My platform is mpc8540 with graphics chip Fujitsu MB86296, my
kernel version is 2.6.12.6 <http://2.6.12.6>. I'm about to write a
gfxdriver so DirectFB can call this gfxdriver to make MB86296 do some
drawing things. I wrote a program to test if the MB86296 drawing
registers can be read and written. here is some part of the pragram:
[snip]
ioctl(3, 0x20004d2f, 0x7fe47914) = -1 EINVAL (Invalid argument)
write(1, "ioctlReadRes[0]=484,ioctlReadRes"...,
45ioctlReadRes[0]=484,ioctlReadRes[1]=30026f58
) = 45
munmap(0x32028000, 4096) = 0
exit_group(45) = ?
from above, I think the problem is in ioctl call, which shows "EINVAL
(Invalid argument)", so I added printk() to xx_ioctl() in fb driver, and
it showed xx_ioctl() was not called .Then I checked xx_ioctl() was
right. where is my problem? how to call ioctl() right??
probably, your problem is missing mb86290-driver specific ioctl
hook in the "mb86290fb_ops" structure definition in
drivers/video/mb86290/mb86290fb.c.
Ensure that this structure definition contains something like this:
.fb_ioctl = mb86290fb_ioctl,
Without this assignment only generic framebuffer ioctl will be called,
maybe therefore you can not see driver specific ioctl call. Generic
ioctl "doesn't understand" FBIO_MB86290_READ_DRAW_REG argument and
simply returns -EINVAL.
Best regards,
Anatolij
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