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Subject[PATCH v3 15/20] Input: bcm5974 - Convert to MT-B
Date
Use of the in-kernel tracking code to convert the driver to MT-B.

With ten fingers on the pad, the in-kernel tracking adds approximately
25 us to the maximum irqsoff latency. Under normal workloads, however,
the tracking has no measurable effect.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
---
drivers/input/mouse/bcm5974.c | 80 ++++++++++++++-----------------------------
1 file changed, 26 insertions(+), 54 deletions(-)
diff --git a/drivers/input/mouse/bcm5974.c b/drivers/input/mouse/bcm5974.c
index 7f7ea62..9555aa5 100644
--- a/drivers/input/mouse/bcm5974.c
+++ b/drivers/input/mouse/bcm5974.c
@@ -40,6 +40,7 @@
#include <linux/usb/input.h>
#include <linux/hid.h>
#include <linux/mutex.h>
+#include <linux/input/mt.h>

#define USB_VENDOR_ID_APPLE 0x05ac

@@ -234,6 +235,9 @@ struct bcm5974 {
struct bt_data *bt_data; /* button transferred data */
struct urb *tp_urb; /* trackpad usb request block */
u8 *tp_data; /* trackpad transferred data */
+ const struct tp_finger *index[MAX_FINGERS]; /* finger index data */
+ struct input_mt_pos pos[MAX_FINGERS]; /* position array */
+ int slots[MAX_FINGERS]; /* slot assignments */
};

/* logical signal quality */
@@ -398,10 +402,6 @@ static void setup_events_to_report(struct input_dev *input_dev,
{
__set_bit(EV_ABS, input_dev->evbit);

- /* pointer emulation */
- set_abs(input_dev, ABS_X, &cfg->w);
- set_abs(input_dev, ABS_Y, &cfg->w);
-
/* finger touch area */
set_abs(input_dev, ABS_MT_TOUCH_MAJOR, &cfg->w);
set_abs(input_dev, ABS_MT_TOUCH_MINOR, &cfg->w);
@@ -415,18 +415,13 @@ static void setup_events_to_report(struct input_dev *input_dev,
set_abs(input_dev, ABS_MT_POSITION_Y, &cfg->y);

__set_bit(EV_KEY, input_dev->evbit);
- __set_bit(BTN_TOUCH, input_dev->keybit);
- __set_bit(BTN_TOOL_FINGER, input_dev->keybit);
- __set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
- __set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
- __set_bit(BTN_TOOL_QUADTAP, input_dev->keybit);
__set_bit(BTN_LEFT, input_dev->keybit);

- __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
if (cfg->caps & HAS_INTEGRATED_BUTTON)
__set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);

- input_set_events_per_packet(input_dev, 60);
+ input_mt_init_slots(input_dev, MAX_FINGERS,
+ INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED | INPUT_MT_TRACK);
}

/* report button data as logical button state */
@@ -446,10 +441,13 @@ static int report_bt_state(struct bcm5974 *dev, int size)
return 0;
}

-static void report_finger_data(struct input_dev *input,
- const struct bcm5974_config *cfg,
+static void report_finger_data(struct input_dev *input, int slot,
+ const struct input_mt_pos *pos,
const struct tp_finger *f)
{
+ input_mt_slot(input, slot);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+
input_report_abs(input, ABS_MT_TOUCH_MAJOR,
raw2int(f->touch_major) << 1);
input_report_abs(input, ABS_MT_TOUCH_MINOR,
@@ -460,10 +458,8 @@ static void report_finger_data(struct input_dev *input,
raw2int(f->tool_minor) << 1);
input_report_abs(input, ABS_MT_ORIENTATION,
MAX_FINGER_ORIENTATION - raw2int(f->orientation));
- input_report_abs(input, ABS_MT_POSITION_X, raw2int(f->abs_x));
- input_report_abs(input, ABS_MT_POSITION_Y,
- cfg->y.min + cfg->y.max - raw2int(f->abs_y));
- input_mt_sync(input);
+ input_report_abs(input, ABS_MT_POSITION_X, pos->x);
+ input_report_abs(input, ABS_MT_POSITION_Y, pos->y);
}

/* report trackpad data as logical trackpad state */
@@ -472,8 +468,7 @@ static int report_tp_state(struct bcm5974 *dev, int size)
const struct bcm5974_config *c = &dev->cfg;
const struct tp_finger *f;
struct input_dev *input = dev->input;
- int raw_p, raw_x, raw_y, raw_n, i;
- int abs_x = 0, abs_y = 0, n = 0;
+ int raw_n, i, n = 0;

if (size < c->tp_offset || (size - c->tp_offset) % SIZEOF_FINGER != 0)
return -EIO;
@@ -482,44 +477,21 @@ static int report_tp_state(struct bcm5974 *dev, int size)
f = (const struct tp_finger *)(dev->tp_data + c->tp_offset);
raw_n = (size - c->tp_offset) / SIZEOF_FINGER;

- /* always track the first finger; when detached, start over */
- if (raw_n) {
-
- /* report raw trackpad data */
- for (i = 0; i < raw_n; i++)
- report_finger_data(input, c, &f[i]);
-
- raw_p = raw2int(f->touch_major);
- raw_x = raw2int(f->abs_x);
- raw_y = raw2int(f->abs_y);
-
- dprintk(9,
- "bcm5974: "
- "raw: p: %+05d x: %+05d y: %+05d n: %d\n",
- raw_p, raw_x, raw_y, raw_n);
-
- /* while tracking finger still valid, count all fingers */
- if (raw_p > 0 && raw2int(f->origin)) {
- abs_x = raw_x;
- abs_y = c->y.min + c->y.max - raw_y;
- while (raw_n--) {
- if (raw2int(f->touch_major) > 0)
- n++;
- f++;
- }
- }
+ for (i = 0; i < raw_n; i++) {
+ if (raw2int(f[i].touch_major) == 0)
+ continue;
+ dev->pos[n].x = raw2int(f[i].abs_x);
+ dev->pos[n].y = c->y.min + c->y.max - raw2int(f[i].abs_y);
+ dev->index[n++] = &f[i];
}

- input_report_key(input, BTN_TOUCH, n > 0);
- input_report_key(input, BTN_TOOL_FINGER, n == 1);
- input_report_key(input, BTN_TOOL_DOUBLETAP, n == 2);
- input_report_key(input, BTN_TOOL_TRIPLETAP, n == 3);
- input_report_key(input, BTN_TOOL_QUADTAP, n > 3);
+ input_mt_assign_slots(input, dev->slots, dev->pos, n);

- if (n > 0) {
- input_report_abs(input, ABS_X, abs_x);
- input_report_abs(input, ABS_Y, abs_y);
- }
+ for (i = 0; i < n; i++)
+ report_finger_data(input, dev->slots[i],
+ &dev->pos[i], dev->index[i]);
+
+ input_mt_sync_frame(input);

/* type 2 reports button events via ibt only */
if (c->tp_type == TYPE2) {
--
1.7.12


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