Messages in this thread |  | | | Date | Tue, 10 Feb 2009 21:29:28 +0100 | | Subject | Re: [PATCH] lis3lv02d: add axes knowledge of HP Pavilion dv5 models | | From | Giuseppe Bilotta <> |
| |
On Tue, Feb 10, 2009 at 1:42 PM, Éric Piel <E.A.B.Piel@tudelft.nl> wrote: > Giuseppe Bilotta schreef: >> oblomov@oblomov:~$ cat /sys/devices/platform/lis3lv02d/position >> (-256,256,14592) >> oblomov@oblomov:~$ cat /sys/devices/platform/lis3lv02d/position >> (0,256,14848) >> oblomov@oblomov:~$ cat /sys/devices/platform/lis3lv02d/position >> (-256,256,14848) >> oblomov@oblomov:~$ cat /sys/devices/platform/lis3lv02d/position >> (-256,0,14336) >> oblomov@oblomov:~$ cat /sys/devices/platform/lis3lv02d/position >> (-256,512,14336) >> oblomov@oblomov:~$ cat /sys/devices/platform/lis3lv02d/position >> (256,256,14592) >> >> Left edge raised: >> oblomov@oblomov:~$ cat /sys/devices/platform/lis3lv02d/position >> (5120,512,13312) >> oblomov@oblomov:~$ cat /sys/devices/platform/lis3lv02d/position >> (5632,512,13312) >> >> You might be onto something. > Yes, beautiful! All are multiples of 2⁸, so much a sign of MSB/LSB > inversion! And the good news is that the device just happens to have a > register to set the endianess: CTRL2/BLE . For now, in the driver, we > expect the device to be little endian (which is the default according to > the manual). So at initialization we could force the endianess and see > if that fix the problem. > > Can you try something like this in lis3lv02d_poweron(): > adev.read(handle, CTRL_REG2, &val); > val |= CTRL2_BDU | CTRL2_IEN; > + val &= ~CTRL2_BLE; > adev.write(handle, CTRL_REG2, val);
I reverted both my patch and the 'minimal init' patch from Pavel, then added this line. However, it seems to change nothing. Even using CTRL2_BLE instead of its negation doesn't seem to change much: same fluctuations, and cat'ing the sysfs file still gives 256, 512 etc.
-- Giuseppe "Oblomov" Bilotta -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |