[PATCH V1] Input: synaptics-rmi4 - Supports to query DPM value.

[Marge Yang <marge.yang@tw.synaptics.com>]

RMI4 F12 will support to query DPM value on Touchpad.
When TP firmware doesn't support to report logical and
physical value within the Touchpad's HID report,
We can directly query the DPM value through RMI.

Signed-off-by: Marge Yang <marge.yang@tw.synaptics.com>
Signed-off-by: Vincent Huang <Vincent.Huang@tw.synaptics.com>
---
 drivers/input/rmi4/rmi_f12.c | 41 +++++++++++++++++++++++++++++++----------
 1 file changed, 31 insertions(+), 10 deletions(-)

diff --git a/drivers/input/rmi4/rmi_f12.c b/drivers/input/rmi4/rmi_f12.c
index 7e97944..6a7a17d 100644
--- a/drivers/input/rmi4/rmi_f12.c
+++ b/drivers/input/rmi4/rmi_f12.c
@@ -24,6 +24,7 @@ enum rmi_f12_object_type {
 };
 
 #define F12_DATA1_BYTES_PER_OBJ			8
+#define RMI_QUERY_DPM_IN_PRESENSE_BIT          29
 
 struct f12_data {
 	struct rmi_2d_sensor sensor;
@@ -73,6 +74,8 @@ static int rmi_f12_read_sensor_tuning(struct f12_data *f12)
 	int pitch_y = 0;
 	int rx_receivers = 0;
 	int tx_receivers = 0;
+	u16 query_dpm_addr = 0;
+	int dpm_resolution = 0;
 
 	item = rmi_get_register_desc_item(&f12->control_reg_desc, 8);
 	if (!item) {
@@ -122,18 +125,36 @@ static int rmi_f12_read_sensor_tuning(struct f12_data *f12)
 		offset += 4;
 	}
 
-	if (rmi_register_desc_has_subpacket(item, 3)) {
-		rx_receivers = buf[offset];
-		tx_receivers = buf[offset + 1];
-		offset += 2;
-	}
+	// Only supports to query DPM value on RMI F12.
+	item = rmi_get_register_desc_item(&f12->query_reg_desc, RMI_QUERY_DPM_IN_PRESENSE_BIT);
+	if (item) {
+		offset = rmi_register_desc_calc_reg_offset(&f12->query_reg_desc,
+			RMI_QUERY_DPM_IN_PRESENSE_BIT);
+		query_dpm_addr = fn->fd.query_base_addr	+ offset;
+		ret = rmi_read(fn->rmi_dev, query_dpm_addr, buf);
+		if (ret < 0) {
+			dev_err(&fn->dev, "Failed to read DPM value: %d\n", ret);
+			return -ENODEV;
+		}
+		dpm_resolution = buf[0];
+
+		sensor->x_mm = sensor->max_x / dpm_resolution;
+		sensor->y_mm = sensor->max_y / dpm_resolution;
+	} else {
+		if (rmi_register_desc_has_subpacket(item, 3)) {
+			rx_receivers = buf[offset];
+			tx_receivers = buf[offset + 1];
+			offset += 2;
+		}
 
-	/* Skip over sensor flags */
-	if (rmi_register_desc_has_subpacket(item, 4))
-		offset += 1;
+		/* Skip over sensor flags */
+		if (rmi_register_desc_has_subpacket(item, 4))
+			offset += 1;
+
+		sensor->x_mm = (pitch_x * rx_receivers) >> 12;
+		sensor->y_mm = (pitch_y * tx_receivers) >> 12;
+	}
 
-	sensor->x_mm = (pitch_x * rx_receivers) >> 12;
-	sensor->y_mm = (pitch_y * tx_receivers) >> 12;
 
 	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "%s: x_mm: %d y_mm: %d\n", __func__,
 		sensor->x_mm, sensor->y_mm);
-- 
2.7.4