573 lines
15 KiB
Diff
573 lines
15 KiB
Diff
From: Mathias Gottschlag <mgottschlag@gmail.com>
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Date: Mon, 29 Dec 2014 09:26:35 -0800
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Subject: [2/6] Input: psmouse - support for the FocalTech PS/2 protocol
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extensions
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Origin: https://git.kernel.org/linus/05be1d079ec0b3691783e4384b1ada82149ff7d2
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Most of the protocol for these touchpads has been reverse engineered. This
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commit adds a basic multitouch-capable driver.
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A lot of the protocol is still unknown. Especially, we don't know how to
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identify the device yet apart from the PNP ID.
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The previous workaround for these devices has been left in place in case
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the driver is not compiled into the kernel or in case some other device
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with the same PNP ID is not recognized by the driver yet still has the same
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problems with the device probing code.
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Signed-off-by: Mathias Gottschlag <mgottschlag@gmail.com>
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Reviewed-by: Hans de Goede <hdegoede@redhat.com>
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Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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---
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drivers/input/mouse/Kconfig | 10 +
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drivers/input/mouse/focaltech.c | 408 ++++++++++++++++++++++++++++++++++++-
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drivers/input/mouse/focaltech.h | 2 +
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drivers/input/mouse/psmouse-base.c | 32 ++-
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drivers/input/mouse/psmouse.h | 1 +
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5 files changed, 436 insertions(+), 17 deletions(-)
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--- a/drivers/input/mouse/Kconfig
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+++ b/drivers/input/mouse/Kconfig
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@@ -146,6 +146,16 @@ config MOUSE_PS2_OLPC
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If unsure, say N.
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+config MOUSE_PS2_FOCALTECH
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+ bool "FocalTech PS/2 mouse protocol extension" if EXPERT
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+ default y
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+ depends on MOUSE_PS2
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+ help
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+ Say Y here if you have a FocalTech PS/2 TouchPad connected to
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+ your system.
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+
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+ If unsure, say Y.
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+
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config MOUSE_SERIAL
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tristate "Serial mouse"
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select SERIO
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--- a/drivers/input/mouse/focaltech.c
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+++ b/drivers/input/mouse/focaltech.c
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@@ -2,6 +2,7 @@
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* Focaltech TouchPad PS/2 mouse driver
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*
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* Copyright (c) 2014 Red Hat Inc.
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+ * Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@@ -13,15 +14,14 @@
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* Hans de Goede <hdegoede@redhat.com>
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*/
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-/*
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- * The Focaltech PS/2 touchpad protocol is unknown. This drivers deals with
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- * detection only, to avoid further detection attempts confusing the touchpad
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- * this way it at least works in PS/2 mouse compatibility mode.
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- */
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#include <linux/device.h>
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#include <linux/libps2.h>
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+#include <linux/input/mt.h>
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+#include <linux/serio.h>
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+#include <linux/slab.h>
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#include "psmouse.h"
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+#include "focaltech.h"
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static const char * const focaltech_pnp_ids[] = {
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"FLT0101",
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@@ -30,6 +30,12 @@ static const char * const focaltech_pnp_
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NULL
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};
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+/*
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+ * Even if the kernel is built without support for Focaltech PS/2 touchpads (or
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+ * when the real driver fails to recognize the device), we still have to detect
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+ * them in order to avoid further detection attempts confusing the touchpad.
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+ * This way it at least works in PS/2 mouse compatibility mode.
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+ */
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int focaltech_detect(struct psmouse *psmouse, bool set_properties)
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{
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if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids))
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@@ -37,16 +43,404 @@ int focaltech_detect(struct psmouse *psm
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if (set_properties) {
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psmouse->vendor = "FocalTech";
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- psmouse->name = "FocalTech Touchpad in mouse emulation mode";
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+ psmouse->name = "FocalTech Touchpad";
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}
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return 0;
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}
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-int focaltech_init(struct psmouse *psmouse)
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+static void focaltech_reset(struct psmouse *psmouse)
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{
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ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
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psmouse_reset(psmouse);
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+}
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+
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+#ifdef CONFIG_MOUSE_PS2_FOCALTECH
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+
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+/*
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+ * Packet types - the numbers are not consecutive, so we might be missing
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+ * something here.
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+ */
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+#define FOC_TOUCH 0x3 /* bitmap of active fingers */
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+#define FOC_ABS 0x6 /* absolute position of one finger */
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+#define FOC_REL 0x9 /* relative position of 1-2 fingers */
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+
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+#define FOC_MAX_FINGERS 5
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+
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+#define FOC_MAX_X 2431
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+#define FOC_MAX_Y 1663
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+
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+/*
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+ * Current state of a single finger on the touchpad.
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+ */
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+struct focaltech_finger_state {
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+ /* The touchpad has generated a touch event for the finger */
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+ bool active;
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+
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+ /*
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+ * The touchpad has sent position data for the finger. The
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+ * flag is 0 when the finger is not active, and there is a
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+ * time between the first touch event for the finger and the
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+ * following absolute position packet for the finger where the
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+ * touchpad has declared the finger to be valid, but we do not
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+ * have any valid position yet.
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+ */
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+ bool valid;
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+
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+ /*
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+ * Absolute position (from the bottom left corner) of the
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+ * finger.
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+ */
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+ unsigned int x;
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+ unsigned int y;
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+};
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+
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+/*
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+ * Description of the current state of the touchpad hardware.
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+ */
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+struct focaltech_hw_state {
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+ /*
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+ * The touchpad tracks the positions of the fingers for us,
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+ * the array indices correspond to the finger indices returned
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+ * in the report packages.
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+ */
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+ struct focaltech_finger_state fingers[FOC_MAX_FINGERS];
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+
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+ /* True if the clickpad has been pressed. */
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+ bool pressed;
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+};
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+
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+struct focaltech_data {
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+ unsigned int x_max, y_max;
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+ struct focaltech_hw_state state;
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+};
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+
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+static void focaltech_report_state(struct psmouse *psmouse)
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+{
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+ struct focaltech_data *priv = psmouse->private;
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+ struct focaltech_hw_state *state = &priv->state;
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+ struct input_dev *dev = psmouse->dev;
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+ int i;
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+
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+ for (i = 0; i < FOC_MAX_FINGERS; i++) {
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+ struct focaltech_finger_state *finger = &state->fingers[i];
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+ bool active = finger->active && finger->valid;
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+
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+ input_mt_slot(dev, i);
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+ input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
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+ if (active) {
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+ input_report_abs(dev, ABS_MT_POSITION_X, finger->x);
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+ input_report_abs(dev, ABS_MT_POSITION_Y,
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+ FOC_MAX_Y - finger->y);
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+ }
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+ }
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+ input_mt_report_pointer_emulation(dev, true);
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+
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+ input_report_key(psmouse->dev, BTN_LEFT, state->pressed);
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+ input_sync(psmouse->dev);
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+}
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+
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+static void focaltech_process_touch_packet(struct psmouse *psmouse,
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+ unsigned char *packet)
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+{
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+ struct focaltech_data *priv = psmouse->private;
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+ struct focaltech_hw_state *state = &priv->state;
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+ unsigned char fingers = packet[1];
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+ int i;
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+
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+ state->pressed = (packet[0] >> 4) & 1;
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+
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+ /* the second byte contains a bitmap of all fingers touching the pad */
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+ for (i = 0; i < FOC_MAX_FINGERS; i++) {
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+ state->fingers[i].active = fingers & 0x1;
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+ if (!state->fingers[i].active) {
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+ /*
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+ * Even when the finger becomes active again, we still
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+ * will have to wait for the first valid position.
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+ */
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+ state->fingers[i].valid = false;
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+ }
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+ fingers >>= 1;
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+ }
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+}
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+
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+static void focaltech_process_abs_packet(struct psmouse *psmouse,
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+ unsigned char *packet)
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+{
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+ struct focaltech_data *priv = psmouse->private;
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+ struct focaltech_hw_state *state = &priv->state;
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+ unsigned int finger;
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+
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+ finger = (packet[1] >> 4) - 1;
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+ if (finger >= FOC_MAX_FINGERS) {
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+ psmouse_err(psmouse, "Invalid finger in abs packet: %d\n",
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+ finger);
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+ return;
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+ }
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+
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+ state->pressed = (packet[0] >> 4) & 1;
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+
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+ /*
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+ * packet[5] contains some kind of tool size in the most
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+ * significant nibble. 0xff is a special value (latching) that
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+ * signals a large contact area.
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+ */
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+ if (packet[5] == 0xff) {
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+ state->fingers[finger].valid = false;
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+ return;
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+ }
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+
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+ state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2];
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+ state->fingers[finger].y = (packet[3] << 8) | packet[4];
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+ state->fingers[finger].valid = true;
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+}
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+
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+static void focaltech_process_rel_packet(struct psmouse *psmouse,
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+ unsigned char *packet)
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+{
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+ struct focaltech_data *priv = psmouse->private;
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+ struct focaltech_hw_state *state = &priv->state;
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+ int finger1, finger2;
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+
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+ state->pressed = packet[0] >> 7;
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+ finger1 = ((packet[0] >> 4) & 0x7) - 1;
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+ if (finger1 < FOC_MAX_FINGERS) {
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+ state->fingers[finger1].x += (char)packet[1];
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+ state->fingers[finger1].y += (char)packet[2];
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+ } else {
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+ psmouse_err(psmouse, "First finger in rel packet invalid: %d\n",
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+ finger1);
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+ }
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+
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+ /*
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+ * If there is an odd number of fingers, the last relative
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+ * packet only contains one finger. In this case, the second
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+ * finger index in the packet is 0 (we subtract 1 in the lines
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+ * above to create array indices, so the finger will overflow
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+ * and be above FOC_MAX_FINGERS).
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+ */
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+ finger2 = ((packet[3] >> 4) & 0x7) - 1;
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+ if (finger2 < FOC_MAX_FINGERS) {
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+ state->fingers[finger2].x += (char)packet[4];
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+ state->fingers[finger2].y += (char)packet[5];
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+ }
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+}
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+
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+static void focaltech_process_packet(struct psmouse *psmouse)
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+{
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+ unsigned char *packet = psmouse->packet;
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+
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+ switch (packet[0] & 0xf) {
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+ case FOC_TOUCH:
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+ focaltech_process_touch_packet(psmouse, packet);
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+ break;
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+
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+ case FOC_ABS:
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+ focaltech_process_abs_packet(psmouse, packet);
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+ break;
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+
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+ case FOC_REL:
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+ focaltech_process_rel_packet(psmouse, packet);
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+ break;
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+
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+ default:
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+ psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]);
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+ break;
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+ }
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+
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+ focaltech_report_state(psmouse);
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+}
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+
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+static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse)
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+{
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+ if (psmouse->pktcnt >= 6) { /* Full packet received */
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+ focaltech_process_packet(psmouse);
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+ return PSMOUSE_FULL_PACKET;
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+ }
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+
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+ /*
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+ * We might want to do some validation of the data here, but
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+ * we do not know the protocol well enough
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+ */
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+ return PSMOUSE_GOOD_DATA;
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+}
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+
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+static int focaltech_switch_protocol(struct psmouse *psmouse)
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+{
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+ struct ps2dev *ps2dev = &psmouse->ps2dev;
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+ unsigned char param[3];
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+
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+ param[0] = 0;
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+ if (ps2_command(ps2dev, param, 0x10f8))
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+ return -EIO;
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+
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+ if (ps2_command(ps2dev, param, 0x10f8))
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+ return -EIO;
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+
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+ if (ps2_command(ps2dev, param, 0x10f8))
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+ return -EIO;
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+
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+ param[0] = 1;
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+ if (ps2_command(ps2dev, param, 0x10f8))
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+ return -EIO;
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+
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+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
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+ return -EIO;
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+
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+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE))
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+ return -EIO;
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+
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+ return 0;
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+}
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+
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+static void focaltech_disconnect(struct psmouse *psmouse)
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+{
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+ focaltech_reset(psmouse);
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+ kfree(psmouse->private);
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+ psmouse->private = NULL;
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+}
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+
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+static int focaltech_reconnect(struct psmouse *psmouse)
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+{
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+ int error;
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+
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+ focaltech_reset(psmouse);
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+
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+ error = focaltech_switch_protocol(psmouse);
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+ if (error) {
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+ psmouse_err(psmouse, "Unable to initialize the device\n");
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+ return error;
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+ }
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+
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+ return 0;
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+}
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+
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+static void focaltech_set_input_params(struct psmouse *psmouse)
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+{
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+ struct input_dev *dev = psmouse->dev;
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+ struct focaltech_data *priv = psmouse->private;
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+
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+ /*
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+ * Undo part of setup done for us by psmouse core since touchpad
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+ * is not a relative device.
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+ */
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+ __clear_bit(EV_REL, dev->evbit);
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+ __clear_bit(REL_X, dev->relbit);
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+ __clear_bit(REL_Y, dev->relbit);
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+ __clear_bit(BTN_RIGHT, dev->keybit);
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+ __clear_bit(BTN_MIDDLE, dev->keybit);
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+
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+ /*
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+ * Now set up our capabilities.
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+ */
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+ __set_bit(EV_ABS, dev->evbit);
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+ input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
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+ input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
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+ input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
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+ __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
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+}
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+
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+static int focaltech_read_register(struct ps2dev *ps2dev, int reg,
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+ unsigned char *param)
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+{
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+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
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+ return -EIO;
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+
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+ param[0] = 0;
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+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
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+ return -EIO;
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+
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+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
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+ return -EIO;
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+
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+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
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+ return -EIO;
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+
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+ param[0] = reg;
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+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
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+ return -EIO;
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+
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+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
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+ return -EIO;
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+
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+ return 0;
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+}
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+
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+static int focaltech_read_size(struct psmouse *psmouse)
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+{
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+ struct ps2dev *ps2dev = &psmouse->ps2dev;
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+ struct focaltech_data *priv = psmouse->private;
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+ char param[3];
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+
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+ if (focaltech_read_register(ps2dev, 2, param))
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+ return -EIO;
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+
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+ /* not sure whether this is 100% correct */
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+ priv->x_max = (unsigned char)param[1] * 128;
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+ priv->y_max = (unsigned char)param[2] * 128;
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+
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+ return 0;
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+}
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+int focaltech_init(struct psmouse *psmouse)
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+{
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+ struct focaltech_data *priv;
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+ int error;
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+
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+ psmouse->private = priv = kzalloc(sizeof(struct focaltech_data),
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+ GFP_KERNEL);
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+ if (!priv)
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+ return -ENOMEM;
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+
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+ focaltech_reset(psmouse);
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+
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+ error = focaltech_read_size(psmouse);
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+ if (error) {
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+ psmouse_err(psmouse,
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+ "Unable to read the size of the touchpad\n");
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+ goto fail;
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+ }
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+
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+ error = focaltech_switch_protocol(psmouse);
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+ if (error) {
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+ psmouse_err(psmouse, "Unable to initialize the device\n");
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+ goto fail;
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+ }
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+
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+ focaltech_set_input_params(psmouse);
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+
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+ psmouse->protocol_handler = focaltech_process_byte;
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+ psmouse->pktsize = 6;
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+ psmouse->disconnect = focaltech_disconnect;
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+ psmouse->reconnect = focaltech_reconnect;
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+ psmouse->cleanup = focaltech_reset;
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+ /* resync is not supported yet */
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+ psmouse->resync_time = 0;
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return 0;
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+
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+fail:
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+ focaltech_reset(psmouse);
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+ kfree(priv);
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+ return error;
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}
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+
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+bool focaltech_supported(void)
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+{
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+ return true;
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+}
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+
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+#else /* CONFIG_MOUSE_PS2_FOCALTECH */
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+
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+int focaltech_init(struct psmouse *psmouse)
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+{
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+ focaltech_reset(psmouse);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+bool focaltech_supported(void)
|
|
+{
|
|
+ return false;
|
|
+}
|
|
+
|
|
+#endif /* CONFIG_MOUSE_PS2_FOCALTECH */
|
|
--- a/drivers/input/mouse/focaltech.h
|
|
+++ b/drivers/input/mouse/focaltech.h
|
|
@@ -2,6 +2,7 @@
|
|
* Focaltech TouchPad PS/2 mouse driver
|
|
*
|
|
* Copyright (c) 2014 Red Hat Inc.
|
|
+ * Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.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
|
|
@@ -18,5 +19,6 @@
|
|
|
|
int focaltech_detect(struct psmouse *psmouse, bool set_properties);
|
|
int focaltech_init(struct psmouse *psmouse);
|
|
+bool focaltech_supported(void);
|
|
|
|
#endif
|
|
--- a/drivers/input/mouse/psmouse-base.c
|
|
+++ b/drivers/input/mouse/psmouse-base.c
|
|
@@ -723,16 +723,19 @@ static int psmouse_extensions(struct psm
|
|
|
|
/* Always check for focaltech, this is safe as it uses pnp-id matching */
|
|
if (psmouse_do_detect(focaltech_detect, psmouse, set_properties) == 0) {
|
|
- if (!set_properties || focaltech_init(psmouse) == 0) {
|
|
- /*
|
|
- * Not supported yet, use bare protocol.
|
|
- * Note that we need to also restrict
|
|
- * psmouse_max_proto so that psmouse_initialize()
|
|
- * does not try to reset rate and resolution,
|
|
- * because even that upsets the device.
|
|
- */
|
|
- psmouse_max_proto = PSMOUSE_PS2;
|
|
- return PSMOUSE_PS2;
|
|
+ if (max_proto > PSMOUSE_IMEX) {
|
|
+ if (!set_properties || focaltech_init(psmouse) == 0) {
|
|
+ if (focaltech_supported())
|
|
+ return PSMOUSE_FOCALTECH;
|
|
+ /*
|
|
+ * Note that we need to also restrict
|
|
+ * psmouse_max_proto so that psmouse_initialize()
|
|
+ * does not try to reset rate and resolution,
|
|
+ * because even that upsets the device.
|
|
+ */
|
|
+ psmouse_max_proto = PSMOUSE_PS2;
|
|
+ return PSMOUSE_PS2;
|
|
+ }
|
|
}
|
|
}
|
|
|
|
@@ -1061,6 +1064,15 @@ static const struct psmouse_protocol psm
|
|
.alias = "cortps",
|
|
.detect = cortron_detect,
|
|
},
|
|
+#ifdef CONFIG_MOUSE_PS2_FOCALTECH
|
|
+ {
|
|
+ .type = PSMOUSE_FOCALTECH,
|
|
+ .name = "FocalTechPS/2",
|
|
+ .alias = "focaltech",
|
|
+ .detect = focaltech_detect,
|
|
+ .init = focaltech_init,
|
|
+ },
|
|
+#endif
|
|
{
|
|
.type = PSMOUSE_AUTO,
|
|
.name = "auto",
|
|
--- a/drivers/input/mouse/psmouse.h
|
|
+++ b/drivers/input/mouse/psmouse.h
|
|
@@ -96,6 +96,7 @@ enum psmouse_type {
|
|
PSMOUSE_FSP,
|
|
PSMOUSE_SYNAPTICS_RELATIVE,
|
|
PSMOUSE_CYPRESS,
|
|
+ PSMOUSE_FOCALTECH,
|
|
PSMOUSE_AUTO /* This one should always be last */
|
|
};
|
|
|