Added (untested) support for ALPS touchpads using the 2.4

linux kernel.

1 files changed, 187 insertions, 0 deletions

diff --git a/alpscomm.c b/alpscomm.c
new file mode 100644
index 0000000..34cacf6
--- /dev/null
+++ b/alpscomm.c
@@ -0,0 +1,187 @@
+/* Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
+ *
+ * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
+ * Copyright (c) 2003-2004 Peter Osterlund <petero2@telia.com>
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation; either version 2
+ *   of the License, or (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include "alpscomm.h"
+#include "synproto.h"
+#include "synaptics.h"
+#include <xf86.h>
+
+/*
+ * send the ALPSinit sequence, ie 4 consecutive "disable"s before the "enable"
+ */
+static void
+ALPS_initialize(int fd)
+{
+    ps2_synaptics_disable_device(fd);
+    ps2_synaptics_disable_device(fd);
+    ps2_synaptics_disable_device(fd);
+    ps2_synaptics_disable_device(fd);
+    ps2_synaptics_enable_device(fd);
+}
+
+static void
+ALPSDeviceOnHook(LocalDevicePtr local)
+{
+}
+
+static void
+ALPSDeviceOffHook(LocalDevicePtr local)
+{
+}
+
+static Bool
+ALPSQueryHardware(LocalDevicePtr local, struct SynapticsHwInfo *synhw)
+{
+    ALPS_initialize(local->fd);    
+    return TRUE;
+}
+
+static Bool
+ALPS_packet_ok(struct CommData *comm)
+{
+    /* ALPS absolute mode packets start with 0b11111mrl */
+    if ((comm->protoBuf[0] & 0xf8) == 0xf8)
+	return TRUE;
+    return FALSE;
+}
+
+static Bool
+ALPS_get_packet(struct CommData *comm)
+{
+    int c;
+
+    while ((c = XisbRead(comm->buffer)) >= 0) {
+	unsigned char u = (unsigned char)c;
+
+	comm->protoBuf[comm->protoBufTail++] = u;
+
+	/* Check that we have a valid packet. If not, we are out of sync,
+	   so we throw away the first byte in the packet.*/
+	if (comm->protoBufTail >= 6) {
+	    if (!ALPS_packet_ok(comm)) {
+		int i;
+		for (i = 0; i < comm->protoBufTail - 1; i++)
+		    comm->protoBuf[i] = comm->protoBuf[i + 1];
+		comm->protoBufTail--;
+	    }
+	}
+
+	if (comm->protoBufTail >= 6) { /* Full packet received */
+	    comm->protoBufTail = 0;
+	    return TRUE;
+	}
+    }
+
+    return FALSE;
+}
+
+/*
+ * ALPS abolute Mode
+ * byte 0: 1 1 1 1 1 mid0 rig0 lef0
+ * byte 1: 0 x6 x5 x4 x3 x2 x1 x0
+ * byte 2: 0 x10 x9 x8 x7 up1 fin ges
+ * byte 3: 0 y9 y8 y7 1 mid1 rig1 lef1
+ * byte 4: 0 y6 y5 y4 y3 y2 y1 y0
+ * byte 5: 0 z6 z5 z4 z3 z2 z1 z0
+ *
+ * On a dualpoint, {mid,rig,lef}0 are the stick, 1 are the pad.
+ * We just 'or' them together for now.
+ *
+ * The touchpad on an 'Acer Aspire' has 4 buttons:
+ *   left,right,up,down.
+ * This device always sets {mid,rig,lef}0 to 1 and
+ * reflects left,right,down,up in lef1,rig1,mid1,up1.
+ */
+static void
+ALPS_process_packet(unsigned char *packet, struct SynapticsHwState *hw)
+{
+    int x, y, z;
+    int left = 0, right = 0, middle = 0;
+
+    x = (packet[1] & 0x7f) | ((packet[2] & 0x78)<<(7-3));
+    y = (packet[4] & 0x7f) | ((packet[3] & 0x70)<<(7-4));
+    z = packet[5];
+
+    if (z > 0) {
+	hw->x = x;
+	hw->y = y;
+    }
+    hw->z = z;
+    hw->numFingers = (z > 0) ? 1 : 0;
+    hw->fingerWidth = 5;
+
+    left  |= (packet[2]     ) & 1;
+    left  |= (packet[3]     ) & 1;
+    right |= (packet[3] >> 1) & 1;
+    if (packet[0] == 0xff) {
+	int back    = (packet[3] >> 2) & 1;
+	int forward = (packet[2] >> 2) & 1;
+	if (back && forward) {
+	    middle = 1;
+	    back = 0;
+	    forward = 0;
+	}
+	hw->down = back;
+	hw->up = forward;
+    } else {
+	left   |= (packet[0]     ) & 1;
+	right  |= (packet[0] >> 1) & 1;
+	middle |= (packet[0] >> 2) & 1;
+	middle |= (packet[3] >> 2) & 1;
+    }
+
+    hw->left = left;
+    hw->right = right;
+    hw->middle = middle;
+}
+
+static Bool
+ALPSReadHwState(LocalDevicePtr local, struct SynapticsHwInfo *synhw,
+		struct SynapticsProtocolOperations *proto_ops,
+		struct CommData *comm, struct SynapticsHwState *hwRet)
+{
+    unsigned char *buf = comm->protoBuf;
+    struct SynapticsHwState *hw = &(comm->hwState);
+
+    if (!ALPS_get_packet(comm))
+	return FALSE;
+
+    memset(hw, 0, sizeof(*hw));
+
+    ALPS_process_packet(buf, hw);
+
+    *hwRet = *hw;
+    return TRUE;
+}
+
+static Bool
+ALPSAutoDevProbe(LocalDevicePtr local)
+{
+    return FALSE;
+}
+
+struct SynapticsProtocolOperations alps_proto_operations = {
+    ALPSDeviceOnHook,
+    ALPSDeviceOffHook,
+    ALPSQueryHardware,
+    ALPSReadHwState,
+    ALPSAutoDevProbe
+};