On Mon, Jan 24, 2011 at 03:07:19PM -0800, Ping Cheng wrote:
> Resolution uses different units in the kernel (point/mm), XInput
> (point/m), and the hardware protocol (point/cm/1000 for touch and
> point/inch for pen).
>
> We have a resolution table for pen in the X driver. But we get the
> touch resolution directly from the kernel through HID descriptor.
>
> For kernels older than 2.6.30, resolution is not part of absinfo.
> For kernels older than 2.6.35, kernel does not pass resolution to
> the userland.
>
> This patch addresses those issues and correct a conversion bug
> introduced by the RX/RY workaround.
>
> Signed-off-by: Ping Cheng <pingli...@gmail.com>
> Reviewed-by: Chris Bagwell <ch...@cnpbagwell.com>
> ---
> src/wcmUSB.c | 49 +++++++++++++++++++++++++++++++++++--------------
> 1 files changed, 35 insertions(+), 14 deletions(-)
>
> diff --git a/src/wcmUSB.c b/src/wcmUSB.c
> index cfaf920..38a191b 100644
> --- a/src/wcmUSB.c
> +++ b/src/wcmUSB.c
> @@ -27,6 +27,9 @@
> #include <asm/types.h>
> #include <linux/input.h>
> #include <sys/utsname.h>
> +# ifndef LINUX_VERSION_CODE
why not just include linux/version.h unconditionally?
> +# include <linux/version.h>
> +# endif
>
> #define MAX_USB_EVENTS 32
>
> @@ -463,8 +466,19 @@ int usbWcmGetRanges(InputInfoPtr pInfo)
> if (!is_touch)
> common->wcmMaxX = absinfo.maximum;
> else
> + {
> common->wcmMaxTouchX = absinfo.maximum;
>
> + /* reset touch resolution since we retrieve it from the kernel
> + * through absinfo (on kenrels 2.6.35 or later) or
> + * RX (on kenrels older than 2.6.35) below
> + */
> + common->wcmTouchResolX = 0;
this should be unnecessary. wcmAllocate uses calloc.
> +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,30)
> + common->wcmTouchResolX = absinfo.resolution * 1000;
> +#endif
> + }
> +
> /* max y */
> if (ioctl(pInfo->fd, EVIOCGABS(ABS_Y), &absinfo) < 0)
> {
> @@ -480,36 +494,43 @@ int usbWcmGetRanges(InputInfoPtr pInfo)
> if (!is_touch)
> common->wcmMaxY = absinfo.maximum;
> else
> + {
> common->wcmMaxTouchY = absinfo.maximum;
>
> + /* reset touch resolution since we retrieve it from the kernel
> + * through absinfo (on kenrels 2.6.35 or later) or
> + * RY (on kenrels older than 2.6.35) below
> + */
> + common->wcmTouchResolY = 0;
> +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,30)
> + common->wcmTouchResolY = absinfo.resolution * 1000;
> +#endif
> + }
> +
> /* max finger strip X for tablets with Expresskeys
> - * or touch physical X for TabletPCs with touch */
> + * or physical X for touch device in thousandth of a cm */
wcmTouchResolY in the header file claims points/mm. this seems at odds with
this comment here.
> if (ioctl(pInfo->fd, EVIOCGABS(ABS_RX), &absinfo) == 0)
> {
> - if (is_touch)
> - common->wcmTouchResolX = absinfo.maximum;
> + if (is_touch && !common->wcmTouchResolX)
no. please add the same ifdef here so it's obvious why instead of the
non-obvious !common->wcmTouchResolX.
Cheers,
Peter
> + common->wcmTouchResolX =
> + (int)(((double)common->wcmMaxTouchX * 10.0
> + / (double)absinfo.maximum) + 0.5);
> else
> common->wcmMaxStripX = absinfo.maximum;
> }
>
> /* max finger strip Y for tablets with Expresskeys
> - * or touch physical Y for TabletPCs with touch */
> + * or physical Y for touch device in thousandth of a cm */
> if (ioctl(pInfo->fd, EVIOCGABS(ABS_RY), &absinfo) == 0)
> {
> - if (is_touch)
> - common->wcmTouchResolY = absinfo.maximum;
> + if (is_touch && !common->wcmTouchResolY)
> + common->wcmTouchResolY =
> + (int)(((double)common->wcmMaxTouchY * 10.0
> + / (double)absinfo.maximum) + 0.5);
> else
> common->wcmMaxStripY = absinfo.maximum;
> }
>
> - if (is_touch && common->wcmTouchResolX && common->wcmMaxTouchX)
> - {
> - common->wcmTouchResolX = (int)(((double)common->wcmTouchResolX)
> - / ((double)common->wcmMaxTouchX) + 0.5);
> - common->wcmTouchResolY = (int)(((double)common->wcmTouchResolY)
> - / ((double)common->wcmMaxTouchY) + 0.5);
> - }
> -
> /* max z cannot be configured */
> if (ioctl(pInfo->fd, EVIOCGABS(ABS_PRESSURE), &absinfo) == 0)
> common->wcmMaxZ = absinfo.maximum;
> --
> 1.7.3.4
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