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@xxxxxxxxx>
---
Here's a new version of the patch I posted last week. I've revised
it according to comments from Dmitry. Please comment if I got the
idea completely wrong or if there's something I could fine tune.
I had some doubts regarding my change in set_input_params() where the
parameters generally seemed to be set to input_dev by calling
input_set_abs_params() helper function. I did not add new resolution
parameter to this function since its use was so wide spread. I just
assign the resolution parameters directly which seemed more practical
for me.
drivers/input/evdev.c | 8 ++++++--
drivers/input/mouse/synaptics.c | 28 ++++++++++++++++++++++++++++
drivers/input/mouse/synaptics.h | 2 ++
include/linux/input.h | 2 ++
4 files changed, 38 insertions(+), 2 deletions(-)
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 7a7a026..f2df97f 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -626,8 +626,10 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
abs.maximum = dev->absmax[t];
abs.fuzz = dev->absfuzz[t];
abs.flat = dev->absflat[t];
+ abs.resolution = dev->absres[t];
- if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
+ if (copy_to_user(p, &abs,
+ min(_IOC_SIZE(cmd), sizeof(struct input_absinfo))))
return -EFAULT;
return 0;
@@ -655,7 +657,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
t = _IOC_NR(cmd) & ABS_MAX;
if (copy_from_user(&abs, p,
- sizeof(struct input_absinfo)))
+ min(_IOC_SIZE(cmd), sizeof(struct input_absinfo))))
return -EFAULT;
/*
@@ -670,6 +672,8 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
dev->absmax[t] = abs.maximum;
dev->absfuzz[t] = abs.fuzz;
dev->absflat[t] = abs.flat;
+ dev->absres[t] = (_IOC_SIZE(cmd) < sizeof(struct input_absinfo)) ?
+ 0 : abs.resolution;
spin_unlock_irq(&dev->event_lock);
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index f3e4f7b..19984bf 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -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)
diff --git a/drivers/input/mouse/synaptics.h b/drivers/input/mouse/synaptics.h
index 02aa4cf..3023821 100644
--- a/drivers/input/mouse/synaptics.h
+++ b/drivers/input/mouse/synaptics.h
@@ -97,6 +97,8 @@ struct synaptics_data {
unsigned long int capabilities; /* Capabilities */
unsigned long int ext_cap; /* Extended Capabilities */
unsigned long int identity; /* Identification */
+ int x_res; /* X resolution in units/mm */
+ int y_res; /* Y resolution in units/mm */
unsigned char pkt_type; /* packet type - old, new, etc */
unsigned char mode; /* current mode byte */
diff --git a/include/linux/input.h b/include/linux/input.h
index 0e6ff5d..351638d 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -53,6 +53,7 @@ struct input_absinfo {
__s32 maximum;
__s32 fuzz;
__s32 flat;
+ __s32 resolution;
};
#define EVIOCGVERSION _IOR('E', 0x01, int) /* get driver version */
@@ -1108,6 +1109,7 @@ struct input_dev {
int absmin[ABS_MAX + 1];
int absfuzz[ABS_MAX + 1];
int absflat[ABS_MAX + 1];
+ int absres[ABS_MAX + 1];
int (*open)(struct input_dev *dev);
void (*close)(struct input_dev *dev);
--
1.6.0.4
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