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Subject[PATCH 01/19] Input: Break out MT data
Date
Move all MT-related things to a separate place. This saves some
bytes for non-mt input devices, and prepares for new MT features.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
---
drivers/input/evdev.c | 10 ++++++----
drivers/input/input-mt.c | 47 +++++++++++++++++++++++++++--------------------
drivers/input/input.c | 9 ++++-----
include/linux/input.h | 9 ++-------
include/linux/input/mt.h | 16 ++++++++++++++--
5 files changed, 53 insertions(+), 38 deletions(-)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 6c58bff..a0692c5 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -653,20 +653,22 @@ static int evdev_handle_mt_request(struct input_dev *dev,
unsigned int size,
int __user *ip)
{
- const struct input_mt_slot *mt = dev->mt;
+ const struct input_mt *mt = dev->mt;
unsigned int code;
int max_slots;
int i;

if (get_user(code, &ip[0]))
return -EFAULT;
- if (!input_is_mt_value(code))
+ if (!mt || !input_is_mt_value(code))
return -EINVAL;

max_slots = (size - sizeof(__u32)) / sizeof(__s32);
- for (i = 0; i < dev->mtsize && i < max_slots; i++)
- if (put_user(input_mt_get_value(&mt[i], code), &ip[1 + i]))
+ for (i = 0; i < mt->num_slots && i < max_slots; i++) {
+ int value = input_mt_get_value(&mt->slots[i], code);
+ if (put_user(value, &ip[1 + i]))
return -EFAULT;
+ }

return 0;
}
diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
index 70a16c7..c6df704 100644
--- a/drivers/input/input-mt.c
+++ b/drivers/input/input-mt.c
@@ -27,26 +27,28 @@
*/
int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots)
{
+ struct input_mt *mt = dev->mt;
int i;

if (!num_slots)
return 0;
- if (dev->mt)
- return dev->mtsize != num_slots ? -EINVAL : 0;
+ if (mt)
+ return mt->num_slots != num_slots ? -EINVAL : 0;

- dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL);
- if (!dev->mt)
+ mt = kzalloc(sizeof(*mt) + num_slots * sizeof(*mt->slots), GFP_KERNEL);
+ if (!mt)
return -ENOMEM;

- dev->mtsize = num_slots;
+ mt->num_slots = num_slots;
input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
input_set_abs_params(dev, ABS_MT_TRACKING_ID, 0, TRKID_MAX, 0, 0);
input_set_events_per_packet(dev, 6 * num_slots);

/* Mark slots as 'unused' */
for (i = 0; i < num_slots; i++)
- input_mt_set_value(&dev->mt[i], ABS_MT_TRACKING_ID, -1);
+ input_mt_set_value(&mt->slots[i], ABS_MT_TRACKING_ID, -1);

+ dev->mt = mt;
return 0;
}
EXPORT_SYMBOL(input_mt_init_slots);
@@ -62,9 +64,7 @@ void input_mt_destroy_slots(struct input_dev *dev)
{
kfree(dev->mt);
dev->mt = NULL;
- dev->mtsize = 0;
dev->slot = 0;
- dev->trkid = 0;
}
EXPORT_SYMBOL(input_mt_destroy_slots);

@@ -83,18 +83,19 @@ EXPORT_SYMBOL(input_mt_destroy_slots);
void input_mt_report_slot_state(struct input_dev *dev,
unsigned int tool_type, bool active)
{
- struct input_mt_slot *mt;
+ struct input_mt *mt = dev->mt;
+ struct input_mt_slot *slot;
int id;

- if (!dev->mt || !active) {
+ if (!mt || !active) {
input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
return;
}

- mt = &dev->mt[dev->slot];
- id = input_mt_get_value(mt, ABS_MT_TRACKING_ID);
- if (id < 0 || input_mt_get_value(mt, ABS_MT_TOOL_TYPE) != tool_type)
- id = input_mt_new_trkid(dev);
+ slot = &mt->slots[dev->slot];
+ id = input_mt_get_value(slot, ABS_MT_TRACKING_ID);
+ if (id < 0 || input_mt_get_value(slot, ABS_MT_TOOL_TYPE) != tool_type)
+ id = input_mt_new_trkid(mt);

input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, id);
input_event(dev, EV_ABS, ABS_MT_TOOL_TYPE, tool_type);
@@ -135,13 +136,19 @@ EXPORT_SYMBOL(input_mt_report_finger_count);
*/
void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
{
- struct input_mt_slot *oldest = NULL;
- int oldid = dev->trkid;
- int count = 0;
- int i;
+ struct input_mt *mt = dev->mt;
+ struct input_mt_slot *oldest;
+ int oldid, count, i;
+
+ if (!mt)
+ return;
+
+ oldest = 0;
+ oldid = mt->trkid;
+ count = 0;

- for (i = 0; i < dev->mtsize; ++i) {
- struct input_mt_slot *ps = &dev->mt[i];
+ for (i = 0; i < mt->num_slots; ++i) {
+ struct input_mt_slot *ps = &mt->slots[i];
int id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);

if (id < 0)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 8921c61..6e90705 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -174,7 +174,7 @@ static int input_handle_abs_event(struct input_dev *dev,
* "Stage" the event; we'll flush it later, when we
* get actual touch data.
*/
- if (*pval >= 0 && *pval < dev->mtsize)
+ if (dev->mt && *pval >= 0 && *pval < dev->mt->num_slots)
dev->slot = *pval;

return INPUT_IGNORE_EVENT;
@@ -185,8 +185,7 @@ static int input_handle_abs_event(struct input_dev *dev,
if (!is_mt_event) {
pold = &dev->absinfo[code].value;
} else if (dev->mt) {
- struct input_mt_slot *mtslot = &dev->mt[dev->slot];
- pold = &mtslot->abs[code - ABS_MT_FIRST];
+ pold = &dev->mt->slots[dev->slot].abs[code - ABS_MT_FIRST];
} else {
/*
* Bypass filtering for multi-touch events when
@@ -1751,8 +1750,8 @@ static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
int i;
unsigned int events;

- if (dev->mtsize) {
- mt_slots = dev->mtsize;
+ if (dev->mt) {
+ mt_slots = dev->mt->num_slots;
} else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
diff --git a/include/linux/input.h b/include/linux/input.h
index 725dcd0..76d6788 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -1203,11 +1203,8 @@ struct ff_effect {
* software autorepeat
* @timer: timer for software autorepeat
* @rep: current values for autorepeat parameters (delay, rate)
- * @mt: pointer to array of struct input_mt_slot holding current values
- * of tracked contacts
- * @mtsize: number of MT slots the device uses
+ * @mt: pointer to multitouch state
* @slot: MT slot currently being transmitted
- * @trkid: stores MT tracking ID for the current contact
* @absinfo: array of &struct input_absinfo elements holding information
* about absolute axes (current value, min, max, flat, fuzz,
* resolution)
@@ -1287,10 +1284,8 @@ struct input_dev {

int rep[REP_CNT];

- struct input_mt_slot *mt;
- int mtsize;
+ struct input_mt *mt;
int slot;
- int trkid;

struct input_absinfo *absinfo;

diff --git a/include/linux/input/mt.h b/include/linux/input/mt.h
index f867375..4ae275c 100644
--- a/include/linux/input/mt.h
+++ b/include/linux/input/mt.h
@@ -23,6 +23,18 @@ struct input_mt_slot {
int abs[ABS_MT_LAST - ABS_MT_FIRST + 1];
};

+/**
+ * struct input_mt - state of tracked contacts
+ * @trkid: stores MT tracking ID for the next contact
+ * @num_slots: number of MT slots the device uses
+ * @slots: array of slots holding current values of tracked contacts
+ */
+struct input_mt {
+ int trkid;
+ int num_slots;
+ struct input_mt_slot slots[];
+};
+
static inline void input_mt_set_value(struct input_mt_slot *slot,
unsigned code, int value)
{
@@ -38,9 +50,9 @@ static inline int input_mt_get_value(const struct input_mt_slot *slot,
int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots);
void input_mt_destroy_slots(struct input_dev *dev);

-static inline int input_mt_new_trkid(struct input_dev *dev)
+static inline int input_mt_new_trkid(struct input_mt *mt)
{
- return dev->trkid++ & TRKID_MAX;
+ return mt->trkid++ & TRKID_MAX;
}

static inline void input_mt_slot(struct input_dev *dev, int slot)
--
1.7.11.4


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