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Input: synaptics - add support for reporting x/y resolution

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Synaptics uses anisotropic coordinate system.  On some wide touchpads
vertical resolution can be twice as high as horizontal which causes
unequal sensitivity on x/y directions.  Add support for reading the
resolution with EVIOCGABS ioctl.

Signed-off-by: Tero Saarni <tero.saarni@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Tero Saarni 2009-06-10 23:27:24 -07:00 • committed by Dmitry Torokhov
commit ec20a022aa
4 changed files with 41 additions and 3 deletions
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28
drivers/input/mouse/synaptics.c
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@ -180,6 +180,29 @@ static int synaptics_identify(struct psmouse *psmouse)
return -1;
}
/*
* Read touchpad resolution
* Resolution is left zero if touchpad does not support the query
*/
static int synaptics_resolution(struct psmouse *psmouse)
{
struct synaptics_data *priv = psmouse->private;
unsigned char res[3];
if (SYN_ID_MAJOR(priv->identity) < 4)
return 0;
if (synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, res))
return 0;
if ((res[0] != 0) && (res[1] & 0x80) && (res[2] != 0)) {
priv->x_res = res[0]; /* x resolution in units/mm */
priv->y_res = res[2]; /* y resolution in units/mm */
}
return 0;
}
static int synaptics_query_hardware(struct psmouse *psmouse)
{
if (synaptics_identify(psmouse))
@ -188,6 +211,8 @@ static int synaptics_query_hardware(struct psmouse *psmouse)
return -1;
if (synaptics_capability(psmouse))
return -1;
if (synaptics_resolution(psmouse))
return -1;
return 0;
}
@ -563,6 +588,9 @@ static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
clear_bit(EV_REL, dev->evbit);
clear_bit(REL_X, dev->relbit);
clear_bit(REL_Y, dev->relbit);
dev->absres[ABS_X] = priv->x_res;
dev->absres[ABS_Y] = priv->y_res;
}
static void synaptics_disconnect(struct psmouse *psmouse)