[PATCH v4 4/4] input: Cypress PS/2 Trackpad simulated multitouch (disabled)

[Kamal Mostafa]

This feature is disabled by default; enable with CYPRESS_SIMULATED_MT.

Instead of SEMI_MT, present a full mt interface with simulated contact
positions for >=3 fingers.  Enables e.g. multi-finger tap and drag for
old userspace applications which only count the contact positions.

Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
 drivers/input/mouse/cypress_ps2.c |   18 ++++++++++++++++++
 drivers/input/mouse/cypress_ps2.h |   16 ++++++++++++++--
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/input/mouse/cypress_ps2.c b/drivers/input/mouse/cypress_ps2.c
index fab4d18..088cdb8 100644
--- a/drivers/input/mouse/cypress_ps2.c
+++ b/drivers/input/mouse/cypress_ps2.c
@@ -408,7 +408,9 @@ static int cypress_set_input_params(struct input_dev *input,
 		if (ret < 0)
 			return ret;
 
+#if ( CYPRESS_SIMULATED_MT != 1 )
 		__set_bit(INPUT_PROP_SEMI_MT, input->propbit);
+#endif
 
 		if (cytp->tp_res_x && cytp->tp_res_y) {
 			input_abs_set_res(input, ABS_X, cytp->tp_res_x);
@@ -531,6 +533,22 @@ static int cypress_parse_packet(struct psmouse *psmouse,
 				((packet[5] & 0x0f) << 8) | packet[7];
 			if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 				report_data->contacts[1].z = report_data->contacts[0].z;
+#if ( CYPRESS_SIMULATED_MT == 1 )
+			/* simulate contact positions for >2 fingers */
+			if ( report_data->contact_cnt >= 3 ) {
+				int i;
+				for ( i=1; i<report_data->contact_cnt; i++ ) {
+				    report_data->contacts[i].x =
+						    report_data->contacts[0].x
+						    + 100*(i)*((i%2)?-1:1);
+				    report_data->contacts[i].y =
+						    report_data->contacts[0].y;
+				    if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
+					    report_data->contacts[i].z =
+						    report_data->contacts[0].z;
+				}
+			}
+#endif
 		}
 
 		report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
diff --git a/drivers/input/mouse/cypress_ps2.h b/drivers/input/mouse/cypress_ps2.h
index a74f985..c38cb6f 100644
--- a/drivers/input/mouse/cypress_ps2.h
+++ b/drivers/input/mouse/cypress_ps2.h
@@ -133,8 +133,20 @@
 #define RESP_REMOTE_BIT     0x40
 #define RESP_SMBUS_BIT      0x80
 
-#define CYTP_MAX_CONTACTS 2
-#define CYTP_MAX_MT_SLOTS 2
+/*
+ * CYPRESS_SIMULATED_MT
+ *   set to 1 for simulated multitouch (up to CTYP_MAX_CONTACTS fingers)
+ *   set to 0 for SEMI_MT (2 fingers only)
+ */
+#define CYPRESS_SIMULATED_MT 0
+
+#if ( CYPRESS_SIMULATED_MT == 1 )
+# define CYTP_MAX_CONTACTS 5
+# define CYTP_MAX_MT_SLOTS 16
+#else
+# define CYTP_MAX_CONTACTS 2
+# define CYTP_MAX_MT_SLOTS 2
+#endif
 
 enum cytp_type {
 	CYTP_STG,
-- 
1.7.10.4

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