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SubjectRe: Broken synaptics mouse..
On Sun, Sep 21, 2003 at 07:20:09PM +0200, Peter Osterlund wrote:

> > I'd really prefer to contain the ugliness in mousedev.c, which then
> > could be removed completely in 2.8 or so, when XFree and GPM is already
> > well adapted to the event interface.
>
> That's certainly possible too. See patch below. Note though that this
> patch has the disadvantage mentioned by Dmitry:
>
> We also can't just emulate relative events as everything is
> multiplexed into /dev/input/mice and I can see many people
> using Synaptics via /dev/input/eventX and everything else via
> /dev/input/mice as it nicely handles hot plugging (at least I
> use it this way).

You can use EVIOCGRAB for the time being in the XFree86 synaptics
driver, this way you'll prevent its events coming into mousedev the
moment it's opened by XFree86, which is probably exactly what one wants.

For the future, I'd really like to get rid of /dev/input/mice, exactly
because it's not possible to configure which devices should be mixed in
there. A userspace solution might be better.

I'll get myself a Synaptics-equipped notebook on Monday, test this, and
if it looks OK, I'll merge it.

One thing I don't particularly like is the check for product ==
PSMOUSE_SYNAPTICS, since it's very non-generic. Also, ABS_PRESSURE is
defined on most tablets ...

We should define a standard set of features (ABS_*, BTN_*) that a
touchpad should have, and what they should mean. I fear the current
Synaptics driver gets some of it wrong. (Like the axis orientation,
which is defined to be the same as the USB HID spec, or the fact that
invalid ABS_* values should not be reported).

> linux-petero/drivers/input/mousedev.c | 102 +++++++++++++++++++++++++---------
> 1 files changed, 76 insertions(+), 26 deletions(-)
>
> diff -puN drivers/input/mousedev.c~mousedev-synaptics drivers/input/mousedev.c
> --- linux/drivers/input/mousedev.c~mousedev-synaptics 2003-09-21 14:55:34.000000000 +0200
> +++ linux-petero/drivers/input/mousedev.c 2003-09-21 18:58:47.000000000 +0200
> @@ -26,6 +26,8 @@
> #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
> #include <linux/miscdevice.h>
> #endif
> +#include <linux/serio.h>
> +#include "mouse/psmouse.h" /* For the PSMOUSE_SYNAPTICS definition */
>
> MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
> MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
> @@ -58,6 +60,7 @@ struct mousedev_list {
> unsigned long buttons;
> unsigned char ready, buffer, bufsiz;
> unsigned char mode, imexseq, impsseq;
> + int finger;
> };
>
> #define MOUSEDEV_SEQ_LEN 6
> @@ -73,12 +76,76 @@ static struct mousedev mousedev_mix;
> static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
> static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
>
> +static void mousedev_abs_event(struct input_handle *handle, struct mousedev_list *list, unsigned int code, int value)
> +{
> + int size;
> +
> + /* Ignore joysticks */
> + if (test_bit(BTN_TRIGGER, handle->dev->keybit))
> + return;
> +
> + /* Handle touchpad data */
> + if (test_bit(ABS_PRESSURE, handle->dev->absbit) &&
> + (handle->dev->id.product == PSMOUSE_SYNAPTICS)) {
> + switch (code) {
> + case ABS_PRESSURE:
> + if (!list->finger) {
> + if (value > 30)
> + list->finger = 1;
> + } else {
> + if (value < 25)
> + list->finger = 0;
> + else if (list->finger < 3)
> + list->finger++;
> + }
> + break;
> + case ABS_X:
> + if (list->finger >= 3) {
> + list->dx += (value - list->oldx) / 8;
> + }
> + list->oldx = value;
> + break;
> + case ABS_Y:
> + if (list->finger >= 3) {
> + list->dy += (value - list->oldy) / 8;
> + }
> + list->oldy = value;
> + break;
> + }
> + return;
> + }
> +
> + /* Handle tablet like devices */
> + switch (code) {
> + case ABS_X:
> + size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X];
> + if (size != 0) {
> + list->dx += (value * xres - list->oldx) / size;
> + list->oldx += list->dx * size;
> + } else {
> + list->dx += value - list->oldx;
> + list->oldx += list->dx;
> + }
> + break;
> + case ABS_Y:
> + size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y];
> + if (size != 0) {
> + list->dy -= (value * yres - list->oldy) / size;
> + list->oldy -= list->dy * size;
> + } else {
> + list->dy -= value - list->oldy;
> + list->oldy -= list->dy;
> + }
> + break;
> + }
> +}
> +
> static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
> {
> struct mousedev *mousedevs[3] = { handle->private, &mousedev_mix, NULL };
> struct mousedev **mousedev = mousedevs;
> struct mousedev_list *list;
> - int index, size, wake;
> + int index, wake;
>
> while (*mousedev) {
>
> @@ -87,31 +154,7 @@ static void mousedev_event(struct input_
> list_for_each_entry(list, &(*mousedev)->list, node)
> switch (type) {
> case EV_ABS:
> - if (test_bit(BTN_TRIGGER, handle->dev->keybit))
> - break;
> - switch (code) {
> - case ABS_X:
> - size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X];
> - if (size != 0) {
> - list->dx += (value * xres - list->oldx) / size;
> - list->oldx += list->dx * size;
> - } else {
> - list->dx += value - list->oldx;
> - list->oldx += list->dx;
> - }
> - break;
> -
> - case ABS_Y:
> - size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y];
> - if (size != 0) {
> - list->dy -= (value * yres - list->oldy) / size;
> - list->oldy -= list->dy * size;
> - } else {
> - list->dy -= value - list->oldy;
> - list->oldy -= list->dy;
> - }
> - break;
> - }
> + mousedev_abs_event(handle, list, code, value);
> break;
>
> case EV_REL:
> @@ -473,6 +516,13 @@ static struct input_device_id mousedev_i
> .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
> }, /* A tablet like device, at least touch detection, two absolute axes */
>
> + {
> + .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT | INPUT_DEVICE_ID_MATCH_PRODUCT,
> + .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
> + .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) },
> + .id.product = PSMOUSE_SYNAPTICS,
> + }, /* A synaptics touchpad */
> +
> { }, /* Terminating entry */
> };
>
>
> _
>
> --
> Peter Osterlund - petero2@telia.com
> http://w1.894.telia.com/~u89404340

--
Vojtech Pavlik
SuSE Labs, SuSE CR
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