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authorArjan Opmeer <arjan@opmeer.net>2008-10-17 04:10:19 +0200
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2008-10-17 04:54:35 +0200
commit2a0bd75e5e687a9c34921e942c18477ea7ec2d63 (patch)
treeca2f113e5bb231aca30b139cee03c20332e5c55b /drivers/input/mouse/elantech.h
parentInput: i8042 - add Blue FB5601 to noloop exception table (diff)
downloadlinux-2a0bd75e5e687a9c34921e942c18477ea7ec2d63.tar.xz
linux-2a0bd75e5e687a9c34921e942c18477ea7ec2d63.zip
Input: psmouse - add support for Elantech touchpads
This is version 5 of the driver. Relative mode support has been dropped (users wishing to use touchpad in relative mode can use standard PS/2 protocol emulation done in hardware). The driver supports both original version of Elantech protocol and the newer one used by touchpads installed in EeePC. Signed-off-by: Arjan Opmeer <arjan@opmeer.net> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/mouse/elantech.h')
-rw-r--r--drivers/input/mouse/elantech.h124
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h
new file mode 100644
index 000000000000..bee282b540bc
--- /dev/null
+++ b/drivers/input/mouse/elantech.h
@@ -0,0 +1,124 @@
+/*
+ * Elantech Touchpad driver (v5)
+ *
+ * Copyright (C) 2007-2008 Arjan Opmeer <arjan@opmeer.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Trademarks are the property of their respective owners.
+ */
+
+#ifndef _ELANTECH_H
+#define _ELANTECH_H
+
+/*
+ * Command values for Synaptics style queries
+ */
+#define ETP_FW_VERSION_QUERY 0x01
+#define ETP_CAPABILITIES_QUERY 0x02
+
+/*
+ * Command values for register reading or writing
+ */
+#define ETP_REGISTER_READ 0x10
+#define ETP_REGISTER_WRITE 0x11
+
+/*
+ * Hardware version 2 custom PS/2 command value
+ */
+#define ETP_PS2_CUSTOM_COMMAND 0xf8
+
+/*
+ * Times to retry a ps2_command and millisecond delay between tries
+ */
+#define ETP_PS2_COMMAND_TRIES 3
+#define ETP_PS2_COMMAND_DELAY 500
+
+/*
+ * Times to try to read back a register and millisecond delay between tries
+ */
+#define ETP_READ_BACK_TRIES 5
+#define ETP_READ_BACK_DELAY 2000
+
+/*
+ * Register bitmasks for hardware version 1
+ */
+#define ETP_R10_ABSOLUTE_MODE 0x04
+#define ETP_R11_4_BYTE_MODE 0x02
+
+/*
+ * Capability bitmasks
+ */
+#define ETP_CAP_HAS_ROCKER 0x04
+
+/*
+ * One hard to find application note states that X axis range is 0 to 576
+ * and Y axis range is 0 to 384 for harware version 1.
+ * Edge fuzz might be necessary because of bezel around the touchpad
+ */
+#define ETP_EDGE_FUZZ_V1 32
+
+#define ETP_XMIN_V1 ( 0 + ETP_EDGE_FUZZ_V1)
+#define ETP_XMAX_V1 (576 - ETP_EDGE_FUZZ_V1)
+#define ETP_YMIN_V1 ( 0 + ETP_EDGE_FUZZ_V1)
+#define ETP_YMAX_V1 (384 - ETP_EDGE_FUZZ_V1)
+
+/*
+ * It seems the resolution for hardware version 2 doubled.
+ * Hence the X and Y ranges are doubled too.
+ * The bezel around the pad also appears to be smaller
+ */
+#define ETP_EDGE_FUZZ_V2 8
+
+#define ETP_XMIN_V2 ( 0 + ETP_EDGE_FUZZ_V2)
+#define ETP_XMAX_V2 (1152 - ETP_EDGE_FUZZ_V2)
+#define ETP_YMIN_V2 ( 0 + ETP_EDGE_FUZZ_V2)
+#define ETP_YMAX_V2 ( 768 - ETP_EDGE_FUZZ_V2)
+
+/*
+ * For two finger touches the coordinate of each finger gets reported
+ * separately but with reduced resolution.
+ */
+#define ETP_2FT_FUZZ 4
+
+#define ETP_2FT_XMIN ( 0 + ETP_2FT_FUZZ)
+#define ETP_2FT_XMAX (288 - ETP_2FT_FUZZ)
+#define ETP_2FT_YMIN ( 0 + ETP_2FT_FUZZ)
+#define ETP_2FT_YMAX (192 - ETP_2FT_FUZZ)
+
+struct elantech_data {
+ unsigned char reg_10;
+ unsigned char reg_11;
+ unsigned char reg_20;
+ unsigned char reg_21;
+ unsigned char reg_22;
+ unsigned char reg_23;
+ unsigned char reg_24;
+ unsigned char reg_25;
+ unsigned char reg_26;
+ unsigned char debug;
+ unsigned char capabilities;
+ unsigned char fw_version_maj;
+ unsigned char fw_version_min;
+ unsigned char hw_version;
+ unsigned char paritycheck;
+ unsigned char parity[256];
+};
+
+#ifdef CONFIG_MOUSE_PS2_ELANTECH
+int elantech_detect(struct psmouse *psmouse, int set_properties);
+int elantech_init(struct psmouse *psmouse);
+#else
+static inline int elantech_detect(struct psmouse *psmouse, int set_properties)
+{
+ return -ENOSYS;
+}
+static inline int elantech_init(struct psmouse *psmouse)
+{
+ return -ENOSYS;
+}
+#endif /* CONFIG_MOUSE_PS2_ELANTECH */
+
+#endif