With the rapidly increasing number of intelligent multi-contact and
multi-user devices, the need to send digested, filtered information
from a set of different sources within the same device is imminent.
This patch adds the concept of slots to the MT protocol. The slots
enumerate a set of identified sources, such that all MT events
can be passed independently and selectively per identified source.
The protocol works like this: Instead of sending a SYN_MT_REPORT
event immediately after the contact data, one sends a SYN_MT_SLOT
event immediately before the contact data. The input core will only
emit events for the slots corresponding to the contacts that have
changed. It is assumed that the same slot is used for the duration
of an initiated contact.
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
---
drivers/input/input.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/input.h | 26 ++++++++++++++++++++
2 files changed, 88 insertions(+), 0 deletions(-)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index afd4e2b..217e976 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -181,6 +181,22 @@ static void input_stop_autorepeat(struct input_dev *dev)
#define INPUT_PASS_TO_DEVICE 2
#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
+static void input_handle_mt_event(struct input_dev *dev,
+ unsigned int code, int value)
+{
+ int oldval = dev->mt[dev->slot].abs[code];
+ value = input_defuzz_abs_event(value, oldval, dev->absfuzz[code]);
+ if (value == oldval)
+ return;
+ dev->mt[dev->slot].abs[code] = value;
+ dev->sync = 0;
+ if (dev->slot != dev->last_slot) {
+ dev->last_slot = dev->slot;
+ input_pass_event(dev, EV_SYN, SYN_MT_SLOT, dev->slot);
+ }
+ input_pass_event(dev, EV_ABS, code, value);
+}
+
static void input_handle_event(struct input_dev *dev,
unsigned int type, unsigned int code, int value)
{
@@ -204,6 +220,10 @@ static void input_handle_event(struct ...
