Add psmouse driver from maverick (Ubuntu-2.6.35-23.36).

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 774 insertions, 0 deletions

diff --git a/usr/src/dkms_source_tree/alps.c b/usr/src/dkms_source_tree/alps.c
new file mode 100644
index 0000000..99d5876
--- /dev/null
+++ b/usr/src/dkms_source_tree/alps.c
@@ -0,0 +1,774 @@
+/*
+ * ALPS touchpad PS/2 mouse driver
+ *
+ * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
+ * Copyright (c) 2003-2005 Peter Osterlund <petero2@telia.com>
+ * Copyright (c) 2004 Dmitry Torokhov <dtor@mail.ru>
+ * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
+ * Copyright (c) 2009 Sebastian Kapfer <sebastian_kapfer@gmx.net>
+ *
+ * ALPS detection, tap switching and status querying info is taken from
+ * tpconfig utility (by C. Scott Ananian and Bruce Kall).
+ *
+ * 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.
+ */
+
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+
+#include "psmouse.h"
+#include "alps.h"
+
+#undef DEBUG
+#ifdef DEBUG
+#define dbg(format, arg...) printk(KERN_INFO "alps.c: " format "\n", ## arg)
+#else
+#define dbg(format, arg...) do {} while (0)
+#endif
+
+#define ALPS_OLDPROTO           0x01    /* old style input */
+#define ALPS_DUALPOINT          0x02    /* touchpad has trackstick */
+#define ALPS_PASS               0x04    /* device has a pass-through port */
+
+#define ALPS_WHEEL              0x08    /* hardware wheel present */
+#define ALPS_FW_BK_1            0x10    /* front & back buttons present */
+#define ALPS_FW_BK_2            0x20    /* front & back buttons present */
+#define ALPS_FOUR_BUTTONS       0x40    /* 4 direction button present */
+#define ALPS_PS2_INTERLEAVED    0x80    /* 3-byte PS/2 packet interleaved with
+                                           6-byte ALPS packet */
+
+static const struct alps_model_info alps_model_data[] = {
+        { { 0x32, 0x02, 0x14 }, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT }, /* Toshiba Salellite Pro M10 */
+        { { 0x33, 0x02, 0x0a }, 0x88, 0xf8, ALPS_OLDPROTO },              /* UMAX-530T */
+        { { 0x53, 0x02, 0x0a }, 0xf8, 0xf8, 0 },
+        { { 0x53, 0x02, 0x14 }, 0xf8, 0xf8, 0 },
+        { { 0x60, 0x03, 0xc8 }, 0xf8, 0xf8, 0 },                          /* HP ze1115 */
+        { { 0x63, 0x02, 0x0a }, 0xf8, 0xf8, 0 },
+        { { 0x63, 0x02, 0x14 }, 0xf8, 0xf8, 0 },
+        { { 0x63, 0x02, 0x28 }, 0xf8, 0xf8, ALPS_FW_BK_2 },               /* Fujitsu Siemens S6010 */
+        { { 0x63, 0x02, 0x3c }, 0x8f, 0x8f, ALPS_WHEEL },                 /* Toshiba Satellite S2400-103 */
+        { { 0x63, 0x02, 0x50 }, 0xef, 0xef, ALPS_FW_BK_1 },               /* NEC Versa L320 */
+        { { 0x63, 0x02, 0x64 }, 0xf8, 0xf8, 0 },
+        { { 0x63, 0x03, 0xc8 }, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT }, /* Dell Latitude D800 */
+        { { 0x73, 0x00, 0x0a }, 0xf8, 0xf8, ALPS_DUALPOINT },             /* ThinkPad R61 8918-5QG */
+        { { 0x73, 0x02, 0x0a }, 0xf8, 0xf8, 0 },
+        { { 0x73, 0x02, 0x14 }, 0xf8, 0xf8, ALPS_FW_BK_2 },               /* Ahtec Laptop */
+        { { 0x20, 0x02, 0x0e }, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT }, /* XXX */
+        { { 0x22, 0x02, 0x0a }, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },
+        { { 0x22, 0x02, 0x14 }, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT }, /* Dell Latitude D600 */
+        /* Dell Latitude E5500, E6400, E6500, Precision M4400 */
+        { { 0x62, 0x02, 0x14 }, 0xcf, 0xcf,
+                ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED },
+        { { 0x73, 0x02, 0x50 }, 0xcf, 0xcf, ALPS_FOUR_BUTTONS },          /* Dell Vostro 1400 */
+        { { 0x52, 0x01, 0x14 }, 0xff, 0xff,
+                ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED },      /* Toshiba Tecra A11-11L */
+};
+
+/*
+ * XXX - this entry is suspicious. First byte has zero lower nibble,
+ * which is what a normal mouse would report. Also, the value 0x0e
+ * isn't valid per PS/2 spec.
+ */
+
+/*
+ * PS/2 packet format
+ *
+ * byte 0:  0    0 YSGN XSGN    1    M    R    L
+ * byte 1: X7   X6   X5   X4   X3   X2   X1   X0
+ * byte 2: Y7   Y6   Y5   Y4   Y3   Y2   Y1   Y0
+ *
+ * Note that the device never signals overflow condition.
+ *
+ * ALPS absolute Mode - new format
+ *
+ * byte 0:  1    ?    ?    ?    1    ?    ?    ?
+ * byte 1:  0   x6   x5   x4   x3   x2   x1   x0
+ * byte 2:  0  x10   x9   x8   x7    ?  fin  ges
+ * byte 3:  0   y9   y8   y7    1    M    R    L
+ * byte 4:  0   y6   y5   y4   y3   y2   y1   y0
+ * byte 5:  0   z6   z5   z4   z3   z2   z1   z0
+ *
+ * Dualpoint device -- interleaved packet format
+ *
+ * byte 0:    1    1    0    0    1    1    1    1
+ * byte 1:    0   x6   x5   x4   x3   x2   x1   x0
+ * byte 2:    0  x10   x9   x8   x7    0  fin  ges
+ * byte 3:    0    0 YSGN XSGN    1    1    1    1
+ * byte 4:   X7   X6   X5   X4   X3   X2   X1   X0
+ * byte 5:   Y7   Y6   Y5   Y4   Y3   Y2   Y1   Y0
+ * byte 6:    0   y9   y8   y7    1    m    r    l
+ * byte 7:    0   y6   y5   y4   y3   y2   y1   y0
+ * byte 8:    0   z6   z5   z4   z3   z2   z1   z0
+ *
+ * CAPITALS = stick, miniscules = touchpad
+ *
+ * ?'s can have different meanings on different models,
+ * such as wheel rotation, extra buttons, stick buttons
+ * on a dualpoint, etc.
+ */
+
+static bool alps_is_valid_first_byte(const struct alps_model_info *model,
+                                     unsigned char data)
+{
+        return (data & model->mask0) == model->byte0;
+}
+
+static void alps_report_buttons(struct psmouse *psmouse,
+                                struct input_dev *dev1, struct input_dev *dev2,
+                                int left, int right, int middle)
+{
+        struct input_dev *dev;
+
+        /*
+         * If shared button has already been reported on the
+         * other device (dev2) then this event should be also
+         * sent through that device.
+         */
+        dev = test_bit(BTN_LEFT, dev2->key) ? dev2 : dev1;
+        input_report_key(dev, BTN_LEFT, left);
+
+        dev = test_bit(BTN_RIGHT, dev2->key) ? dev2 : dev1;
+        input_report_key(dev, BTN_RIGHT, right);
+
+        dev = test_bit(BTN_MIDDLE, dev2->key) ? dev2 : dev1;
+        input_report_key(dev, BTN_MIDDLE, middle);
+
+        /*
+         * Sync the _other_ device now, we'll do the first
+         * device later once we report the rest of the events.
+         */
+        input_sync(dev2);
+}
+
+static void alps_process_packet(struct psmouse *psmouse)
+{
+        struct alps_data *priv = psmouse->private;
+        const struct alps_model_info *model = priv->i;
+        unsigned char *packet = psmouse->packet;
+        struct input_dev *dev = psmouse->dev;
+        struct input_dev *dev2 = priv->dev2;
+        int x, y, z, ges, fin, left, right, middle;
+        int back = 0, forward = 0;
+
+        if (model->flags & ALPS_OLDPROTO) {
+                left = packet[2] & 0x10;
+                right = packet[2] & 0x08;
+                middle = 0;
+                x = packet[1] | ((packet[0] & 0x07) << 7);
+                y = packet[4] | ((packet[3] & 0x07) << 7);
+                z = packet[5];
+        } else {
+                left = packet[3] & 1;
+                right = packet[3] & 2;
+                middle = packet[3] & 4;
+                x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
+                y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
+                z = packet[5];
+        }
+
+        if (model->flags & ALPS_FW_BK_1) {
+                back = packet[0] & 0x10;
+                forward = packet[2] & 4;
+        }
+
+        if (model->flags & ALPS_FW_BK_2) {
+                back = packet[3] & 4;
+                forward = packet[2] & 4;
+                if ((middle = forward && back))
+                        forward = back = 0;
+        }
+
+        ges = packet[2] & 1;
+        fin = packet[2] & 2;
+
+        if ((model->flags & ALPS_DUALPOINT) && z == 127) {
+                input_report_rel(dev2, REL_X,  (x > 383 ? (x - 768) : x));
+                input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));
+
+                alps_report_buttons(psmouse, dev2, dev, left, right, middle);
+
+                input_sync(dev2);
+                return;
+        }
+
+        alps_report_buttons(psmouse, dev, dev2, left, right, middle);
+
+        /* Convert hardware tap to a reasonable Z value */
+        if (ges && !fin)
+                z = 40;
+
+        /*
+         * A "tap and drag" operation is reported by the hardware as a transition
+         * from (!fin && ges) to (fin && ges). This should be translated to the
+         * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
+         */
+        if (ges && fin && !priv->prev_fin) {
+                input_report_abs(dev, ABS_X, x);
+                input_report_abs(dev, ABS_Y, y);
+                input_report_abs(dev, ABS_PRESSURE, 0);
+                input_report_key(dev, BTN_TOOL_FINGER, 0);
+                input_sync(dev);
+        }
+        priv->prev_fin = fin;
+
+        if (z > 30)
+                input_report_key(dev, BTN_TOUCH, 1);
+        if (z < 25)
+                input_report_key(dev, BTN_TOUCH, 0);
+
+        if (z > 0) {
+                input_report_abs(dev, ABS_X, x);
+                input_report_abs(dev, ABS_Y, y);
+        }
+
+        input_report_abs(dev, ABS_PRESSURE, z);
+        input_report_key(dev, BTN_TOOL_FINGER, z > 0);
+
+        if (model->flags & ALPS_WHEEL)
+                input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));
+
+        if (model->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
+                input_report_key(dev, BTN_FORWARD, forward);
+                input_report_key(dev, BTN_BACK, back);
+        }
+
+        if (model->flags & ALPS_FOUR_BUTTONS) {
+                input_report_key(dev, BTN_0, packet[2] & 4);
+                input_report_key(dev, BTN_1, packet[0] & 0x10);
+                input_report_key(dev, BTN_2, packet[3] & 4);
+                input_report_key(dev, BTN_3, packet[0] & 0x20);
+        }
+
+        input_sync(dev);
+}
+
+static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
+                                        unsigned char packet[],
+                                        bool report_buttons)
+{
+        struct alps_data *priv = psmouse->private;
+        struct input_dev *dev2 = priv->dev2;
+
+        if (report_buttons)
+                alps_report_buttons(psmouse, dev2, psmouse->dev,
+                                packet[0] & 1, packet[0] & 2, packet[0] & 4);
+
+        input_report_rel(dev2, REL_X,
+                packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0);
+        input_report_rel(dev2, REL_Y,
+                packet[2] ? ((packet[0] << 3) & 0x100) - packet[2] : 0);
+
+        input_sync(dev2);
+}
+
+static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
+{
+        struct alps_data *priv = psmouse->private;
+
+        if (psmouse->pktcnt < 6)
+                return PSMOUSE_GOOD_DATA;
+
+        if (psmouse->pktcnt == 6) {
+                /*
+                 * Start a timer to flush the packet if it ends up last
+                 * 6-byte packet in the stream. Timer needs to fire
+                 * psmouse core times out itself. 20 ms should be enough
+                 * to decide if we are getting more data or not.
+                 */
+                mod_timer(&priv->timer, jiffies + msecs_to_jiffies(20));
+                return PSMOUSE_GOOD_DATA;
+        }
+
+        del_timer(&priv->timer);
+
+        if (psmouse->packet[6] & 0x80) {
+
+                /*
+                 * Highest bit is set - that means we either had
+                 * complete ALPS packet and this is start of the
+                 * next packet or we got garbage.
+                 */
+
+                if (((psmouse->packet[3] |
+                      psmouse->packet[4] |
+                      psmouse->packet[5]) & 0x80) ||
+                    (!alps_is_valid_first_byte(priv->i, psmouse->packet[6]))) {
+                        dbg("refusing packet %x %x %x %x "
+                            "(suspected interleaved ps/2)\n",
+                            psmouse->packet[3], psmouse->packet[4],
+                            psmouse->packet[5], psmouse->packet[6]);
+                        return PSMOUSE_BAD_DATA;
+                }
+
+                alps_process_packet(psmouse);
+
+                /* Continue with the next packet */
+                psmouse->packet[0] = psmouse->packet[6];
+                psmouse->pktcnt = 1;
+
+        } else {
+
+                /*
+                 * High bit is 0 - that means that we indeed got a PS/2
+                 * packet in the middle of ALPS packet.
+                 *
+                 * There is also possibility that we got 6-byte ALPS
+                 * packet followed  by 3-byte packet from trackpoint. We
+                 * can not distinguish between these 2 scenarios but
+                 * becase the latter is unlikely to happen in course of
+                 * normal operation (user would need to press all
+                 * buttons on the pad and start moving trackpoint
+                 * without touching the pad surface) we assume former.
+                 * Even if we are wrong the wost thing that would happen
+                 * the cursor would jump but we should not get protocol
+                 * desynchronization.
+                 */
+
+                alps_report_bare_ps2_packet(psmouse, &psmouse->packet[3],
+                                            false);
+
+                /*
+                 * Continue with the standard ALPS protocol handling,
+                 * but make sure we won't process it as an interleaved
+                 * packet again, which may happen if all buttons are
+                 * pressed. To avoid this let's reset the 4th bit which
+                 * is normally 1.
+                 */
+                psmouse->packet[3] = psmouse->packet[6] & 0xf7;
+                psmouse->pktcnt = 4;
+        }
+
+        return PSMOUSE_GOOD_DATA;
+}
+
+static void alps_flush_packet(unsigned long data)
+{
+        struct psmouse *psmouse = (struct psmouse *)data;
+
+        serio_pause_rx(psmouse->ps2dev.serio);
+
+        if (psmouse->pktcnt == 6) {
+
+                /*
+                 * We did not any more data in reasonable amount of time.
+                 * Validate the last 3 bytes and process as a standard
+                 * ALPS packet.
+                 */
+                if ((psmouse->packet[3] |
+                     psmouse->packet[4] |
+                     psmouse->packet[5]) & 0x80) {
+                        dbg("refusing packet %x %x %x "
+                            "(suspected interleaved ps/2)\n",
+                            psmouse->packet[3], psmouse->packet[4],
+                            psmouse->packet[5]);
+                } else {
+                        alps_process_packet(psmouse);
+                }
+                psmouse->pktcnt = 0;
+        }
+
+        serio_continue_rx(psmouse->ps2dev.serio);
+}
+
+static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
+{
+        struct alps_data *priv = psmouse->private;
+        const struct alps_model_info *model = priv->i;
+
+        if ((psmouse->packet[0] & 0xc8) == 0x08) { /* PS/2 packet */
+                if (psmouse->pktcnt == 3) {
+                        alps_report_bare_ps2_packet(psmouse, psmouse->packet,
+                                                    true);
+                        return PSMOUSE_FULL_PACKET;
+                }
+                return PSMOUSE_GOOD_DATA;
+        }
+
+        /* Check for PS/2 packet stuffed in the middle of ALPS packet. */
+
+        if ((model->flags & ALPS_PS2_INTERLEAVED) &&
+            psmouse->pktcnt >= 4 && (psmouse->packet[3] & 0x0f) == 0x0f) {
+                return alps_handle_interleaved_ps2(psmouse);
+        }
+
+        if (!alps_is_valid_first_byte(model, psmouse->packet[0])) {
+                dbg("refusing packet[0] = %x (mask0 = %x, byte0 = %x)\n",
+                    psmouse->packet[0], model->mask0, model->byte0);
+                return PSMOUSE_BAD_DATA;
+        }
+
+        /* Bytes 2 - 6 should have 0 in the highest bit */
+        if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= 6 &&
+            (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) {
+                dbg("refusing packet[%i] = %x\n",
+                    psmouse->pktcnt - 1, psmouse->packet[psmouse->pktcnt - 1]);
+                return PSMOUSE_BAD_DATA;
+        }
+
+        if (psmouse->pktcnt == 6) {
+                alps_process_packet(psmouse);
+                return PSMOUSE_FULL_PACKET;
+        }
+
+        return PSMOUSE_GOOD_DATA;
+}
+
+static const struct alps_model_info *alps_get_model(struct psmouse *psmouse, int *version)
+{
+        struct ps2dev *ps2dev = &psmouse->ps2dev;
+        static const unsigned char rates[] = { 0, 10, 20, 40, 60, 80, 100, 200 };
+        unsigned char param[4];
+        int i;
+
+        /*
+         * First try "E6 report".
+         * ALPS should return 0,0,10 or 0,0,100
+         */
+        param[0] = 0;
+        if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11))
+                return NULL;
+
+        param[0] = param[1] = param[2] = 0xff;
+        if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
+                return NULL;
+
+        dbg("E6 report: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
+
+        if (param[0] != 0 || param[1] != 0 || (param[2] != 10 && param[2] != 100))
+                return NULL;
+
+        /*
+         * Now try "E7 report". Allowed responses are in
+         * alps_model_data[].signature
+         */
+        param[0] = 0;
+        if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE21) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE21) ||
+            ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE21))
+                return NULL;
+
+        param[0] = param[1] = param[2] = 0xff;
+        if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
+                return NULL;
+
+        dbg("E7 report: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
+
+        if (version) {
+                for (i = 0; i < ARRAY_SIZE(rates) && param[2] != rates[i]; i++)
+                        /* empty */;
+                *version = (param[0] << 8) | (param[1] << 4) | i;
+        }
+
+        for (i = 0; i < ARRAY_SIZE(alps_model_data); i++)
+                if (!memcmp(param, alps_model_data[i].signature,
+                            sizeof(alps_model_data[i].signature)))
+                        return alps_model_data + i;
+
+        return NULL;
+}
+
+/*
+ * For DualPoint devices select the device that should respond to
+ * subsequent commands. It looks like glidepad is behind stickpointer,
+ * I'd thought it would be other way around...
+ */
+static int alps_passthrough_mode(struct psmouse *psmouse, bool enable)
+{
+        struct ps2dev *ps2dev = &psmouse->ps2dev;
+        int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;
+
+        if (ps2_command(ps2dev, NULL, cmd) ||
+            ps2_command(ps2dev, NULL, cmd) ||
+            ps2_command(ps2dev, NULL, cmd) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
+                return -1;
+
+        /* we may get 3 more bytes, just ignore them */
+        ps2_drain(ps2dev, 3, 100);
+
+        return 0;
+}
+
+static int alps_absolute_mode(struct psmouse *psmouse)
+{
+        struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+        /* Try ALPS magic knock - 4 disable before enable */
+        if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
+                return -1;
+
+        /*
+         * Switch mouse to poll (remote) mode so motion data will not
+         * get in our way
+         */
+        return ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
+}
+
+static int alps_get_status(struct psmouse *psmouse, char *param)
+{
+        struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+        /* Get status: 0xF5 0xF5 0xF5 0xE9 */
+        if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
+                return -1;
+
+        dbg("Status: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
+
+        return 0;
+}
+
+/*
+ * Turn touchpad tapping on or off. The sequences are:
+ * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
+ * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
+ * My guess that 0xE9 (GetInfo) is here as a sync point.
+ * For models that also have stickpointer (DualPoints) its tapping
+ * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
+ * we don't fiddle with it.
+ */
+static int alps_tap_mode(struct psmouse *psmouse, int enable)
+{
+        struct ps2dev *ps2dev = &psmouse->ps2dev;
+        int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
+        unsigned char tap_arg = enable ? 0x0A : 0x00;
+        unsigned char param[4];
+
+        if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+            ps2_command(ps2dev, &tap_arg, cmd))
+                return -1;
+
+        if (alps_get_status(psmouse, param))
+                return -1;
+
+        return 0;
+}
+
+/*
+ * alps_poll() - poll the touchpad for current motion packet.
+ * Used in resync.
+ */
+static int alps_poll(struct psmouse *psmouse)
+{
+        struct alps_data *priv = psmouse->private;
+        unsigned char buf[6];
+        bool poll_failed;
+
+        if (priv->i->flags & ALPS_PASS)
+                alps_passthrough_mode(psmouse, true);
+
+        poll_failed = ps2_command(&psmouse->ps2dev, buf,
+                                  PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
+
+        if (priv->i->flags & ALPS_PASS)
+                alps_passthrough_mode(psmouse, false);
+
+        if (poll_failed || (buf[0] & priv->i->mask0) != priv->i->byte0)
+                return -1;
+
+        if ((psmouse->badbyte & 0xc8) == 0x08) {
+/*
+ * Poll the track stick ...
+ */
+                if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
+                        return -1;
+        }
+
+        memcpy(psmouse->packet, buf, sizeof(buf));
+        return 0;
+}
+
+static int alps_hw_init(struct psmouse *psmouse)
+{
+        struct alps_data *priv = psmouse->private;
+        const struct alps_model_info *model = priv->i;
+
+        if ((model->flags & ALPS_PASS) &&
+            alps_passthrough_mode(psmouse, true)) {
+                return -1;
+        }
+
+        if (alps_tap_mode(psmouse, true)) {
+                printk(KERN_WARNING "alps.c: Failed to enable hardware tapping\n");
+                return -1;
+        }
+
+        if (alps_absolute_mode(psmouse)) {
+                printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");
+                return -1;
+        }
+
+        if ((model->flags & ALPS_PASS) &&
+            alps_passthrough_mode(psmouse, false)) {
+                return -1;
+        }
+
+        /* ALPS needs stream mode, otherwise it won't report any data */
+        if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)) {
+                printk(KERN_ERR "alps.c: Failed to enable stream mode\n");
+                return -1;
+        }
+
+        return 0;
+}
+
+static int alps_reconnect(struct psmouse *psmouse)
+{
+        const struct alps_model_info *model;
+
+        psmouse_reset(psmouse);
+
+        model = alps_get_model(psmouse, NULL);
+        if (!model)
+                return -1;
+
+        return alps_hw_init(psmouse);
+}
+
+static void alps_disconnect(struct psmouse *psmouse)
+{
+        struct alps_data *priv = psmouse->private;
+
+        psmouse_reset(psmouse);
+        del_timer_sync(&priv->timer);
+        input_unregister_device(priv->dev2);
+        kfree(priv);
+}
+
+int alps_init(struct psmouse *psmouse)
+{
+        struct alps_data *priv;
+        const struct alps_model_info *model;
+        struct input_dev *dev1 = psmouse->dev, *dev2;
+        int version;
+
+        priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
+        dev2 = input_allocate_device();
+        if (!priv || !dev2)
+                goto init_fail;
+
+        priv->dev2 = dev2;
+        setup_timer(&priv->timer, alps_flush_packet, (unsigned long)psmouse);
+
+        psmouse->private = priv;
+
+        model = alps_get_model(psmouse, &version);
+        if (!model)
+                goto init_fail;
+
+        priv->i = model;
+
+        if (alps_hw_init(psmouse))
+                goto init_fail;
+
+        /*
+         * Undo part of setup done for us by psmouse core since touchpad
+         * is not a relative device.
+         */
+        __clear_bit(EV_REL, dev1->evbit);
+        __clear_bit(REL_X, dev1->relbit);
+        __clear_bit(REL_Y, dev1->relbit);
+
+        /*
+         * Now set up our capabilities.
+         */
+        dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
+        dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
+        dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);
+        dev1->keybit[BIT_WORD(BTN_LEFT)] |=
+                BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
+
+        dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);
+        input_set_abs_params(dev1, ABS_X, 0, 1023, 0, 0);
+        input_set_abs_params(dev1, ABS_Y, 0, 767, 0, 0);
+        input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
+
+        if (model->flags & ALPS_WHEEL) {
+                dev1->evbit[BIT_WORD(EV_REL)] |= BIT_MASK(EV_REL);
+                dev1->relbit[BIT_WORD(REL_WHEEL)] |= BIT_MASK(REL_WHEEL);
+        }
+
+        if (model->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
+                dev1->keybit[BIT_WORD(BTN_FORWARD)] |= BIT_MASK(BTN_FORWARD);
+                dev1->keybit[BIT_WORD(BTN_BACK)] |= BIT_MASK(BTN_BACK);
+        }
+
+        if (model->flags & ALPS_FOUR_BUTTONS) {
+                dev1->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_0);
+                dev1->keybit[BIT_WORD(BTN_1)] |= BIT_MASK(BTN_1);
+                dev1->keybit[BIT_WORD(BTN_2)] |= BIT_MASK(BTN_2);
+                dev1->keybit[BIT_WORD(BTN_3)] |= BIT_MASK(BTN_3);
+        } else {
+                dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
+        }
+
+        snprintf(priv->phys, sizeof(priv->phys), "%s/input1", psmouse->ps2dev.serio->phys);
+        dev2->phys = priv->phys;
+        dev2->name = (model->flags & ALPS_DUALPOINT) ? "DualPoint Stick" : "PS/2 Mouse";
+        dev2->id.bustype = BUS_I8042;
+        dev2->id.vendor  = 0x0002;
+        dev2->id.product = PSMOUSE_ALPS;
+        dev2->id.version = 0x0000;
+        dev2->dev.parent = &psmouse->ps2dev.serio->dev;
+
+        dev2->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+        dev2->relbit[BIT_WORD(REL_X)] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
+        dev2->keybit[BIT_WORD(BTN_LEFT)] =
+                BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
+
+        if (input_register_device(priv->dev2))
+                goto init_fail;
+
+        psmouse->protocol_handler = alps_process_byte;
+        psmouse->poll = alps_poll;
+        psmouse->disconnect = alps_disconnect;
+        psmouse->reconnect = alps_reconnect;
+        psmouse->pktsize = 6;
+
+        /* We are having trouble resyncing ALPS touchpads so disable it for now */
+        psmouse->resync_time = 0;
+
+        return 0;
+
+init_fail:
+        psmouse_reset(psmouse);
+        input_free_device(dev2);
+        kfree(priv);
+        psmouse->private = NULL;
+        return -1;
+}
+
+int alps_detect(struct psmouse *psmouse, bool set_properties)
+{
+        int version;
+        const struct alps_model_info *model;
+
+        model = alps_get_model(psmouse, &version);
+        if (!model)
+                return -1;
+
+        if (set_properties) {
+                psmouse->vendor = "ALPS";
+                psmouse->name = model->flags & ALPS_DUALPOINT ?
+                                "DualPoint TouchPad" : "GlidePoint";
+                psmouse->model = version;
+        }
+        return 0;
+}
+