Today, userspace sets up an input device based on the data it emits.
This is not always enough; a tablet and a touchscreen may emit exactly
the same data, for instance, but the former should be set up with a
pointer whereas the latter does not need to. Recently, a new type of
touchpad has emerged where the buttons are under the pad, which
changes handling logic without changing the emitted data. This patch
introduces a new ioctl, EVIOCGPROP, which enables user access to a set
of device properties useful during setup. The properties are given as
a bitmap in the same fashion as the event types.
Signed-off-by: Henrik Rydberg <rydberg@xxxxxxxxxxx>
---
Hi all,
Here is version two of the device information proposal. In addition to
implementing the feedback, this version only defines a single combined
type/capabilities field. Since we want to support a device being of
multiple types, it suggests that we are really after the properties
that make up a type, rather than the types themselves. And since
quirks are also properties, we end up with a single bitmap of
properties instead.
As an example of how this would work for the
touchpad/tablet/touchscreen triplet, there are two properties defined,
INPUT_PROP_POINTER and INPUT_PROP_DIRECT. A touchpad is an indirect
pointer device, a tablet is a direct pointer device, and the
touchscreen is simply a direct device.
What do you think?
Thanks,
Henrik
PS. As before, the patch compiles, but is not further tested.
drivers/input/evdev.c | 4 ++++
drivers/input/input.c | 2 ++
include/linux/input.h | 16 ++++++++++++++++
3 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index e3f7fc6..0cd97e8 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -677,6 +677,10 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
switch (EVIOC_MASK_SIZE(cmd)) {
+ case EVIOCGPROP(0):
+ return bits_to_user(dev->propbit, INPUT_PROP_MAX,
+ size, p, compat_mode);
+
case EVIOCGKEY(0):
return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode);
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 37708d1..ac751ce 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1409,6 +1409,7 @@ INPUT_DEV_CAP_ATTR(LED, led);
INPUT_DEV_CAP_ATTR(SND, snd);
INPUT_DEV_CAP_ATTR(FF, ff);
INPUT_DEV_CAP_ATTR(SW, sw);
+INPUT_DEV_CAP_ATTR(INPUT_PROP, prop);
static struct attribute *input_dev_caps_attrs[] = {
&dev_attr_ev.attr,
@@ -1420,6 +1421,7 @@ static struct attribute *input_dev_caps_attrs[] = {
&dev_attr_snd.attr,
&dev_attr_ff.attr,
&dev_attr_sw.attr,
+ &dev_attr_prop.attr,
NULL
};
diff --git a/include/linux/input.h b/include/linux/input.h
index b3a1e02..53d6364 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -91,6 +91,7 @@ struct input_keymap_entry {
#define EVIOCGNAME(len) _IOC(_IOC_READ, 'E', 0x06, len) /* get device name */
#define EVIOCGPHYS(len) _IOC(_IOC_READ, 'E', 0x07, len) /* get physical location */
#define EVIOCGUNIQ(len) _IOC(_IOC_READ, 'E', 0x08, len) /* get unique identifier */
+#define EVIOCGPROP(len) _IOC(_IOC_READ, 'E', 0x09, len) /* get device properties */
#define EVIOCGKEY(len) _IOC(_IOC_READ, 'E', 0x18, len) /* get global key state */
#define EVIOCGLED(len) _IOC(_IOC_READ, 'E', 0x19, len) /* get all LEDs */
@@ -108,6 +109,18 @@ struct input_keymap_entry {
#define EVIOCGRAB _IOW('E', 0x90, int) /* Grab/Release device */
/*
+ * Device properties and quirks
+ */
+
+#define INPUT_PROP_POINTER 0x00 /* needs a pointer */
+#define INPUT_PROP_DIRECT 0x01 /* direct object manipulation */
+#define INPUT_PROP_BUTTONPAD 0x02 /* has button(s) under pad */
+#define INPUT_PROP_SEMI_MT 0x03 /* touch rectangle only */
+
+#define INPUT_PROP_MAX 0x1f
+#define INPUT_PROP_CNT (INPUT_PROP_MAX + 1)
+
+/*
* Event types
*/
@@ -1090,6 +1103,7 @@ struct ff_effect {
* @phys: physical path to the device in the system hierarchy
* @uniq: unique identification code for the device (if device has it)
* @id: id of the device (struct input_id)
+ * @propbit: bitmap of device properties and quirks
* @evbit: bitmap of types of events supported by the device (EV_KEY,
* EV_REL, etc.)
* @keybit: bitmap of keys/buttons this device has
@@ -1173,6 +1187,8 @@ struct input_dev {
const char *uniq;
struct input_id id;
+ unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)];
+
unsigned long evbit[BITS_TO_LONGS(EV_CNT)];
unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
unsigned long relbit[BITS_TO_LONGS(REL_CNT)];
--
1.7.2.3
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