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Date: Fri, 9 Aug 2019 17:20:38 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 10/11] Input: bu21013_ts - switch to using MT-B (slotted) protocol
MT-B protocol is more efficient and everyone expects it. We use in-kernel
tracking to identify contacts.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
drivers/input/touchscreen/bu21013_ts.c | 80 ++++++++++++++------------
1 file changed, 43 insertions(+), 37 deletions(-)
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c
index d7e16e915743..2c534aa61687 100644
--- a/drivers/input/touchscreen/bu21013_ts.c
+++ b/drivers/input/touchscreen/bu21013_ts.c
@@ -9,6 +9,7 @@
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
+#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -181,11 +182,13 @@ static int bu21013_read_block_data(struct bu21013_ts *ts, u8 *buf)
static int bu21013_do_touch_report(struct bu21013_ts *ts)
{
- u8 buf[LENGTH_OF_BUFFER];
- unsigned int pos_x[2], pos_y[2];
- bool has_x_sensors, has_y_sensors;
- int finger_down_count = 0;
- int i;
+ struct input_dev *input = ts->in_dev;
+ struct input_mt_pos pos[MAX_FINGERS];
+ int slots[MAX_FINGERS];
+ u8 buf[LENGTH_OF_BUFFER];
+ bool has_x_sensors, has_y_sensors;
+ int finger_down_count = 0;
+ int i;
if (bu21013_read_block_data(ts, buf) < 0)
return -EINVAL;
@@ -197,39 +200,38 @@ static int bu21013_do_touch_report(struct bu21013_ts *ts)
return 0;
for (i = 0; i < MAX_FINGERS; i++) {
- const u8 *p = &buf[4 * i + 3];
- unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS);
- unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS);
- if (x == 0 || y == 0)
+ const u8 *data = &buf[4 * i + 3];
+ struct input_mt_pos *p = &pos[finger_down_count];
+
+ p->x = data[0] << SHIFT_2 | (data[1] & MASK_BITS);
+ p->y = data[2] << SHIFT_2 | (data[3] & MASK_BITS);
+ if (p->x == 0 || p->y == 0)
continue;
- pos_x[finger_down_count] = x;
- pos_y[finger_down_count] = y;
+
finger_down_count++;
+
+ if (ts->x_flip)
+ p->x = ts->touch_x_max - p->x;
+ if (ts->y_flip)
+ p->y = ts->touch_y_max - p->y;
}
- if (finger_down_count) {
- if (finger_down_count == 2 &&
- (abs(pos_x[0] - pos_x[1]) < DELTA_MIN ||
- abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) {
- return 0;
- }
+ if (finger_down_count == 2 &&
+ (abs(pos[0].x - pos[1].x) < DELTA_MIN ||
+ abs(pos[0].y - pos[1].y) < DELTA_MIN)) {
+ return 0;
+ }
- for (i = 0; i < finger_down_count; i++) {
- if (ts->x_flip)
- pos_x[i] = ts->touch_x_max - pos_x[i];
- if (ts->y_flip)
- pos_y[i] = ts->touch_y_max - pos_y[i];
-
- input_report_abs(ts->in_dev,
- ABS_MT_POSITION_X, pos_x[i]);
- input_report_abs(ts->in_dev,
- ABS_MT_POSITION_Y, pos_y[i]);
- input_mt_sync(ts->in_dev);
- }
- } else
- input_mt_sync(ts->in_dev);
+ input_mt_assign_slots(input, slots, pos, finger_down_count, DELTA_MIN);
+ for (i = 0; i < finger_down_count; i++) {
+ input_mt_slot(input, slots[i]);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+ input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
+ input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
+ }
- input_sync(ts->in_dev);
+ input_mt_sync_frame(input);
+ input_sync(input);
return 0;
}
@@ -443,20 +445,24 @@ static int bu21013_probe(struct i2c_client *client,
return -ENOMEM;
}
ts->in_dev = in_dev;
+ input_set_drvdata(in_dev, ts);
/* register the device to input subsystem */
in_dev->name = DRIVER_TP;
in_dev->id.bustype = BUS_I2C;
- __set_bit(EV_SYN, in_dev->evbit);
- __set_bit(EV_KEY, in_dev->evbit);
- __set_bit(EV_ABS, in_dev->evbit);
-
input_set_abs_params(in_dev, ABS_MT_POSITION_X,
0, ts->touch_x_max, 0, 0);
input_set_abs_params(in_dev, ABS_MT_POSITION_Y,
0, ts->touch_y_max, 0, 0);
- input_set_drvdata(in_dev, ts);
+
+ error = input_mt_init_slots(in_dev, MAX_FINGERS,
+ INPUT_MT_DIRECT | INPUT_MT_TRACK |
+ INPUT_MT_DROP_UNUSED);
+ if (error) {
+ dev_err(&client->dev, "failed to initialize MT slots");
+ return error;
+ }
ts->regulator = devm_regulator_get(&client->dev, "avdd");
if (IS_ERR(ts->regulator)) {
--
2.23.0.rc1.153.gdeed80330f-goog
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