Kernel tracking is used in 2 use cases:
- filter out jumps when the sensor is not relieable enough
- provide a MT protocol B when the sensor is providing MT protocol A data
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
---
drivers/input/rmi4/rmi_f11.c | 152 +++++++++++++++++++++++++++++--------------
include/linux/rmi.h | 14 ++--
2 files changed, 114 insertions(+), 52 deletions(-)
diff --git a/drivers/input/rmi4/rmi_f11.c b/drivers/input/rmi4/rmi_f11.c
index 50df7a1..8bccc8a 100644
--- a/drivers/input/rmi4/rmi_f11.c
+++ b/drivers/input/rmi4/rmi_f11.c
@@ -65,6 +65,9 @@
* devices currently in the field.
*/
+/* maximum ABS_MT_POSITION displacement (in mm) */
+#define DMAX 10
+
/**
* @rezero - writing this to the F11 command register will cause the sensor to
* calibrate to the current capacitive state.
@@ -497,9 +500,6 @@ struct f11_2d_data {
* @data_pkt - buffer for data reported by this sensor.
* @pkt_size - number of bytes in that buffer.
* @sensor_index - identifies this particular 2D touch sensor
- * @type_a - some early RMI4 2D sensors do not reliably track the finger
- * position when two fingers are on the device. When this is true, we
- * assume we have one of those sensors and report events appropriately.
* @sensor_type - indicates whether we're touchscreen or touchpad.
* @input - input device for absolute pointing stream
* @input_phys - buffer for the absolute phys name for this sensor.
@@ -508,13 +508,16 @@ struct f11_2d_sensor {
struct rmi_f11_2d_axis_alignment axis_align;
struct f11_2d_sensor_queries sens_query;
struct f11_2d_data data;
+ struct input_mt_pos *tracking_pos;
+ int *tracking_slots;
+ bool kernel_tracking;
+ int dmax;
u16 max_x;
u16 max_y;
u8 nbr_fingers;
u8 *data_pkt;
int pkt_size;
u8 sensor_index;
- u32 type_a; /* boolean but debugfs API requires u32 */
bool topbuttonpad;
enum rmi_f11_sensor_type sensor_type;
struct input_dev *input;
@@ -604,6 +607,53 @@ static void rmi_f11_rel_pos_report(struct f11_2d_sensor *sensor, u8 n_finger)
}
}
+static void rmi_f11_abs_parse_xy(struct f11_data *f11,
+ struct f11_2d_sensor *sensor,
+ enum f11_finger_state finger_state,
+ u8 n_finger)
+{
+ struct f11_2d_data *data = &sensor->data;
+ struct rmi_f11_2d_axis_alignment *axis_align = &sensor->axis_align;
+ u8 *pos_data = &data->abs_pos[n_finger * RMI_F11_ABS_BYTES];
+ u16 x, y;
+
+ /* we keep the previous values if the finger is released */
+ if (!finger_state)
+ return;
+
+ x = (pos_data[0] << 4) | (pos_data[2] & 0x0F);
+ y = (pos_data[1] << 4) | (pos_data[2] >> 4);
+
+ if (axis_align->swap_axes)
+ swap(x, y);
+
+ if (axis_align->flip_x)
+ x = max(sensor->max_x - x, 0);
+
+ if (axis_align->flip_y)
+ y = max(sensor->max_y - y, 0);
+
+ /*
+ * Here checking if X offset or y offset are specified is
+ * redundant. We just add the offsets or clip the values.
+ *
+ * Note: offsets need to be applied before clipping occurs,
+ * or we could get funny values that are outside of
+ * clipping boundaries.
+ */
+ x += axis_align->offset_x;
+ y += axis_align->offset_y;
+ x = max(axis_align->clip_x_low, x);
+ y = max(axis_align->clip_y_low, y);
+ if (axis_align->clip_x_high)
+ x = min(axis_align->clip_x_high, x);
+ if (axis_align->clip_y_high)
+ y = min(axis_align->clip_y_high, y);
+
+ sensor->tracking_pos[n_finger].x = x;
+ sensor->tracking_pos[n_finger].y = y;
+}
+
static void rmi_f11_abs_pos_report(struct f11_data *f11,
struct f11_2d_sensor *sensor,
enum f11_finger_state finger_state,
@@ -617,44 +667,16 @@ static void rmi_f11_abs_pos_report(struct f11_data *f11,
int w_x, w_y, w_max, w_min, orient;
int tool_type = rmi_f11_get_tool_type(sensor, finger_state);
- if (sensor->type_a) {
- input_report_abs(input, ABS_MT_TRACKING_ID, n_finger);
- input_report_abs(input, ABS_MT_TOOL_TYPE, tool_type);
- } else {
+ if (sensor->kernel_tracking)
+ input_mt_slot(input, sensor->tracking_slots[n_finger]);
+ else
input_mt_slot(input, n_finger);
- input_mt_report_slot_state(input, tool_type,
- finger_state != F11_NO_FINGER);
- }
+ input_mt_report_slot_state(input, tool_type,
+ finger_state != F11_NO_FINGER);
if (finger_state) {
- x = (pos_data[0] << 4) | (pos_data[2] & 0x0F);
- y = (pos_data[1] << 4) | (pos_data[2] >> 4);
-
- if (axis_align->swap_axes)
- swap(x, y);
-
- if (axis_align->flip_x)
- x = max(sensor->max_x - x, 0);
-
- if (axis_align->flip_y)
- y = max(sensor->max_y - y, 0);
-
- /*
- * Here checking if X offset or y offset are specified is
- * redundant. We just add the offsets or clip the values.
- *
- * Note: offsets need to be applied before clipping occurs,
- * or we could get funny values that are outside of
- * clipping boundaries.
- */
- x += axis_align->offset_x;
- y += axis_align->offset_y;
- x = max(axis_align->clip_x_low, x);
- y = max(axis_align->clip_y_low, y);
- if (axis_align->clip_x_high)
- x = min(axis_align->clip_x_high, x);
- if (axis_align->clip_y_high)
- y = min(axis_align->clip_y_high, y);
+ x = sensor->tracking_pos[n_finger].x;
+ y = sensor->tracking_pos[n_finger].y;
w_x = pos_data[3] & 0x0f;
w_y = pos_data[3] >> 4;
@@ -690,10 +712,6 @@ static void rmi_f11_abs_pos_report(struct f11_data *f11,
"finger[%d]:%d - x:%d y:%d z:%d w_max:%d w_min:%d\n",
n_finger, finger_state, x, y, z, w_max, w_min);
}
-
- /* MT sync between fingers */
- if (sensor->type_a)
- input_mt_sync(input);
}
static inline u8 rmi_f11_parse_finger_state(const u8 *f_state, u8 n_finger)
@@ -724,13 +742,36 @@ static void rmi_f11_finger_handler(struct f11_data *f11,
}
if (abs_bits)
- rmi_f11_abs_pos_report(f11, sensor, finger_state, i);
+ rmi_f11_abs_parse_xy(f11, sensor, finger_state, i);
if (rel_bits)
rmi_f11_rel_pos_report(sensor, i);
}
- input_mt_sync_frame(sensor->input);
+ if (abs_bits) {
+ /*
+ * the absolute part is made in 2 parts to allow the kernel
+ * tracking to take place.
+ */
+ if (sensor->kernel_tracking)
+ input_mt_assign_slots(sensor->input,
+ sensor->tracking_slots,
+ sensor->tracking_pos,
+ sensor->nbr_fingers,
+ sensor->dmax);
+
+ for (i = 0; i < sensor->nbr_fingers; i++) {
+ finger_state = rmi_f11_parse_finger_state(f_state, i);
+ if (finger_state == F11_RESERVED)
+ /* no need to send twice the error */
+ continue;
+
+ rmi_f11_abs_pos_report(f11, sensor, finger_state, i);
+ }
+
+ input_mt_sync_frame(sensor->input);
+ }
+
if (!sensor->unified_input)
input_sync(sensor->input);
}
@@ -1138,6 +1179,9 @@ static void f11_set_abs_params(struct rmi_function *fn, struct f11_data *f11)
else
input_flags = INPUT_MT_DIRECT;
+ if (sensor->kernel_tracking)
+ input_flags |= INPUT_MT_TRACK;
+
if (sensor->axis_align.swap_axes) {
int temp = device_x_max;
device_x_max = device_y_max;
@@ -1189,10 +1233,12 @@ static void f11_set_abs_params(struct rmi_function *fn, struct f11_data *f11)
input_abs_set_res(input, ABS_MT_POSITION_X, res_x);
input_abs_set_res(input, ABS_MT_POSITION_Y, res_y);
+
+ if (!sensor->dmax)
+ sensor->dmax = DMAX * res_x;
}
- if (!sensor->type_a)
- input_mt_init_slots(input, sensor->nbr_fingers, input_flags);
+ input_mt_init_slots(input, sensor->nbr_fingers, input_flags);
if (IS_ENABLED(CONFIG_RMI4_F11_PEN) && sensor->sens_query.has_pen)
input_set_abs_params(input, ABS_MT_TOOL_TYPE,
0, MT_TOOL_MAX, 0, 0);
@@ -1285,8 +1331,9 @@ static int rmi_f11_initialize(struct rmi_function *fn)
if (pdata->f11_sensor_data) {
sensor->axis_align =
pdata->f11_sensor_data->axis_align;
- sensor->type_a = pdata->f11_sensor_data->type_a;
sensor->topbuttonpad = pdata->f11_sensor_data->topbuttonpad;
+ sensor->kernel_tracking = pdata->f11_sensor_data->kernel_tracking;
+ sensor->dmax = pdata->f11_sensor_data->dmax;
if (sensor->sens_query.has_physical_props) {
sensor->x_mm = sensor->sens_query.x_sensor_size_mm;
@@ -1336,6 +1383,15 @@ static int rmi_f11_initialize(struct rmi_function *fn)
if (rc < 0)
return rc;
+ /* allocate the in-kernel tracking buffers */
+ sensor->tracking_pos = devm_kzalloc(&fn->dev,
+ sizeof(struct input_mt_pos) * sensor->nbr_fingers,
+ GFP_KERNEL);
+ sensor->tracking_slots = devm_kzalloc(&fn->dev,
+ sizeof(int) * sensor->nbr_fingers, GFP_KERNEL);
+ if (!sensor->tracking_pos || !sensor->tracking_slots)
+ return -ENOMEM;
+
ctrl = &f11->dev_controls;
if (sensor->axis_align.delta_x_threshold) {
ctrl->ctrl0_9[RMI_F11_DELTA_X_THRESHOLD] =
diff --git a/include/linux/rmi.h b/include/linux/rmi.h
index 4ffe9fe..f270ff9 100644
--- a/include/linux/rmi.h
+++ b/include/linux/rmi.h
@@ -84,9 +84,6 @@ enum rmi_f11_sensor_type {
/**
* struct rmi_f11_sensor_data - overrides defaults for a single F11 2D sensor.
* @axis_align - provides axis alignment overrides (see above).
- * @type_a - all modern RMI F11 firmwares implement Multifinger Type B
- * protocol. Set this to true to force MF Type A behavior, in case you find
- * an older sensor.
* @sensor_type - Forces the driver to treat the sensor as an indirect
* pointing device (touchpad) rather than a direct pointing device
* (touchscreen). This is useful when F11_2D_QUERY14 register is not
@@ -95,15 +92,24 @@ enum rmi_f11_sensor_type {
* by the firware.
* @topbuttonpad - Used with the "5 buttons touchpads" found on the Lenovo 40
* series
+ * @kernel_tracking - most moderns RMI f11 firmwares implement Multifinger
+ * Type B protocol. However, there are some corner cases where the user
+ * triggers some jumps by tapping with two fingers on the touchpad.
+ * Use this setting and dmax to filter out these jumps.
+ * Also, when using an old sensor using MF Type A behavior, set to true to
+ * report an actual MT protocol B.
+ * @dmax - the maximum distance (in sensor units) the kernel tracking allows two
+ * distincts fingers to be considered the same.
*/
struct rmi_f11_sensor_data {
struct rmi_f11_2d_axis_alignment axis_align;
- bool type_a;
enum rmi_f11_sensor_type sensor_type;
int x_mm;
int y_mm;
int disable_report_mask;
bool topbuttonpad;
+ bool kernel_tracking;
+ int dmax;
};
/**
--
2.4.3
--
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