Invert Y is needed (together with swap XY) for some touchscreens, at least for some of them : - CarTft 8in4 (type=eGalax, USB=0eef:0001) - LeadingTouch Since there is not guarantee that those above devices will all behave the same, it's safer to configure them userland using udev rules. This way is safer than hardcoding options per "recognized" model, and possible regressions will be avoided in a first place. Credits-to: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx> Link: https://lkml.org/lkml/2015/6/7/191 Bug-Link: https://bugs.tizen.org/jira/browse/TC-2522 Cc: linux-input@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Signed-off-by: Philippe Coval <philippe.coval@xxxxxxxxxxxxxxxxxxx> --- ChangeLog: * v1: Initial version from me : Rebased on v4.1.0-rc6 https://lkml.org/lkml/2015/6/7/191 Note it is based on Ondrej Zary's patch (2007): https://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg136266.html Test demo on tizen cartft 8inch4 : https://www.youtube.com/watch?v=4L9Bjfy8oDM * v2: Use bool not int for options variables Rebased on v4.2-rc2 Latest unmerged version can be picked from : https://github.com/rzr/linux/tree/for-upstream * v3: Use bool static vars (for real), update commit message Rebased on v4.2-rc4 https://github.com/dtor/input/pull/2 drivers/input/touchscreen/usbtouchscreen.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c index 2c41107..cfdfb9f 100644 --- a/drivers/input/touchscreen/usbtouchscreen.c +++ b/drivers/input/touchscreen/usbtouchscreen.c @@ -64,6 +64,14 @@ static bool swap_xy; module_param(swap_xy, bool, 0644); MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped."); +static bool invert_x; +module_param(invert_x, bool, 0644); +MODULE_PARM_DESC(invert_x, "Invert X axis."); + +static bool invert_y; +module_param(invert_y, bool, 0644); +MODULE_PARM_DESC(invert_y, "Invert Y axis."); + static bool hwcalib_xy; module_param(hwcalib_xy, bool, 0644); MODULE_PARM_DESC(hwcalib_xy, "If set hw-calibrated X/Y are used if available"); @@ -1306,6 +1314,7 @@ static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch, unsigned char *pkt, int len) { struct usbtouch_device_info *type = usbtouch->type; + int x, y; if (!type->read_data(usbtouch, pkt)) return; @@ -1313,12 +1322,20 @@ static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch, input_report_key(usbtouch->input, BTN_TOUCH, usbtouch->touch); if (swap_xy) { - input_report_abs(usbtouch->input, ABS_X, usbtouch->y); - input_report_abs(usbtouch->input, ABS_Y, usbtouch->x); + x = usbtouch->y; + y = usbtouch->x; } else { - input_report_abs(usbtouch->input, ABS_X, usbtouch->x); - input_report_abs(usbtouch->input, ABS_Y, usbtouch->y); + x = usbtouch->x; + y = usbtouch->y; } + if (invert_x) + x = type->max_xc - x + type->min_xc; + if (invert_y) + y = type->max_yc - y + type->min_yc; + + input_report_abs(usbtouch->input, ABS_X, x); + input_report_abs(usbtouch->input, ABS_Y, y); + if (type->max_press) input_report_abs(usbtouch->input, ABS_PRESSURE, usbtouch->press); input_sync(usbtouch->input); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
