Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2074 insertions, 0 deletions

diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
new file mode 100644
index 000000000..c9a7e87b2
--- /dev/null
+++ b/drivers/input/mouse/psmouse-base.c
@@ -0,0 +1,2074 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PS/2 mouse driver
+ *
+ * Copyright (c) 1999-2002 Vojtech Pavlik
+ * Copyright (c) 2003-2004 Dmitry Torokhov
+ */
+
+
+#define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt
+#define psmouse_fmt(fmt)	fmt
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/init.h>
+#include <linux/libps2.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+
+#include "psmouse.h"
+#include "synaptics.h"
+#include "logips2pp.h"
+#include "alps.h"
+#include "hgpk.h"
+#include "lifebook.h"
+#include "trackpoint.h"
+#include "touchkit_ps2.h"
+#include "elantech.h"
+#include "sentelic.h"
+#include "cypress_ps2.h"
+#include "focaltech.h"
+#include "vmmouse.h"
+#include "byd.h"
+
+#define DRIVER_DESC	"PS/2 mouse driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
+static int psmouse_set_maxproto(const char *val, const struct kernel_param *);
+static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp);
+static const struct kernel_param_ops param_ops_proto_abbrev = {
+	.set = psmouse_set_maxproto,
+	.get = psmouse_get_maxproto,
+};
+#define param_check_proto_abbrev(name, p)	__param_check(name, p, unsigned int)
+module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
+MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");
+
+static unsigned int psmouse_resolution = 200;
+module_param_named(resolution, psmouse_resolution, uint, 0644);
+MODULE_PARM_DESC(resolution, "Resolution, in dpi.");
+
+static unsigned int psmouse_rate = 100;
+module_param_named(rate, psmouse_rate, uint, 0644);
+MODULE_PARM_DESC(rate, "Report rate, in reports per second.");
+
+static bool psmouse_smartscroll = true;
+module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
+MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
+
+static bool psmouse_a4tech_2wheels;
+module_param_named(a4tech_workaround, psmouse_a4tech_2wheels, bool, 0644);
+MODULE_PARM_DESC(a4tech_workaround, "A4Tech second scroll wheel workaround, 1 = enabled, 0 = disabled (default).");
+
+static unsigned int psmouse_resetafter = 5;
+module_param_named(resetafter, psmouse_resetafter, uint, 0644);
+MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");
+
+static unsigned int psmouse_resync_time;
+module_param_named(resync_time, psmouse_resync_time, uint, 0644);
+MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");
+
+PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
+			NULL,
+			psmouse_attr_show_protocol, psmouse_attr_set_protocol);
+PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
+			(void *) offsetof(struct psmouse, rate),
+			psmouse_show_int_attr, psmouse_attr_set_rate);
+PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
+			(void *) offsetof(struct psmouse, resolution),
+			psmouse_show_int_attr, psmouse_attr_set_resolution);
+PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
+			(void *) offsetof(struct psmouse, resetafter),
+			psmouse_show_int_attr, psmouse_set_int_attr);
+PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
+			(void *) offsetof(struct psmouse, resync_time),
+			psmouse_show_int_attr, psmouse_set_int_attr);
+
+static struct attribute *psmouse_dev_attrs[] = {
+	&psmouse_attr_protocol.dattr.attr,
+	&psmouse_attr_rate.dattr.attr,
+	&psmouse_attr_resolution.dattr.attr,
+	&psmouse_attr_resetafter.dattr.attr,
+	&psmouse_attr_resync_time.dattr.attr,
+	NULL
+};
+
+ATTRIBUTE_GROUPS(psmouse_dev);
+
+/*
+ * psmouse_mutex protects all operations changing state of mouse
+ * (connecting, disconnecting, changing rate or resolution via
+ * sysfs). We could use a per-device semaphore but since there
+ * rarely more than one PS/2 mouse connected and since semaphore
+ * is taken in "slow" paths it is not worth it.
+ */
+static DEFINE_MUTEX(psmouse_mutex);
+
+static struct workqueue_struct *kpsmoused_wq;
+
+void psmouse_report_standard_buttons(struct input_dev *dev, u8 buttons)
+{
+	input_report_key(dev, BTN_LEFT,   buttons & BIT(0));
+	input_report_key(dev, BTN_MIDDLE, buttons & BIT(2));
+	input_report_key(dev, BTN_RIGHT,  buttons & BIT(1));
+}
+
+void psmouse_report_standard_motion(struct input_dev *dev, u8 *packet)
+{
+	int x, y;
+
+	x = packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0;
+	y = packet[2] ? packet[2] - ((packet[0] << 3) & 0x100) : 0;
+
+	input_report_rel(dev, REL_X, x);
+	input_report_rel(dev, REL_Y, -y);
+}
+
+void psmouse_report_standard_packet(struct input_dev *dev, u8 *packet)
+{
+	psmouse_report_standard_buttons(dev, packet[0]);
+	psmouse_report_standard_motion(dev, packet);
+}
+
+/*
+ * psmouse_process_byte() analyzes the PS/2 data stream and reports
+ * relevant events to the input module once full packet has arrived.
+ */
+psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
+{
+	struct input_dev *dev = psmouse->dev;
+	u8 *packet = psmouse->packet;
+	int wheel;
+
+	if (psmouse->pktcnt < psmouse->pktsize)
+		return PSMOUSE_GOOD_DATA;
+
+	/* Full packet accumulated, process it */
+
+	switch (psmouse->protocol->type) {
+	case PSMOUSE_IMPS:
+		/* IntelliMouse has scroll wheel */
+		input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
+		break;
+
+	case PSMOUSE_IMEX:
+		/* Scroll wheel and buttons on IntelliMouse Explorer */
+		switch (packet[3] & 0xC0) {
+		case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
+			input_report_rel(dev, REL_WHEEL,
+					 -sign_extend32(packet[3], 5));
+			break;
+		case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
+			input_report_rel(dev, REL_HWHEEL,
+					 -sign_extend32(packet[3], 5));
+			break;
+		case 0x00:
+		case 0xC0:
+			wheel = sign_extend32(packet[3], 3);
+
+			/*
+			 * Some A4Tech mice have two scroll wheels, with first
+			 * one reporting +/-1 in the lower nibble, and second
+			 * one reporting +/-2.
+			 */
+			if (psmouse_a4tech_2wheels && abs(wheel) > 1)
+				input_report_rel(dev, REL_HWHEEL, wheel / 2);
+			else
+				input_report_rel(dev, REL_WHEEL, -wheel);
+
+			input_report_key(dev, BTN_SIDE,  packet[3] & BIT(4));
+			input_report_key(dev, BTN_EXTRA, packet[3] & BIT(5));
+			break;
+		}
+		break;
+
+	case PSMOUSE_GENPS:
+		/* Report scroll buttons on NetMice */
+		input_report_rel(dev, REL_WHEEL, -(s8) packet[3]);
+
+		/* Extra buttons on Genius NewNet 3D */
+		input_report_key(dev, BTN_SIDE,  packet[0] & BIT(6));
+		input_report_key(dev, BTN_EXTRA, packet[0] & BIT(7));
+		break;
+
+	case PSMOUSE_THINKPS:
+		/* Extra button on ThinkingMouse */
+		input_report_key(dev, BTN_EXTRA, packet[0] & BIT(3));
+
+		/*
+		 * Without this bit of weirdness moving up gives wildly
+		 * high Y changes.
+		 */
+		packet[1] |= (packet[0] & 0x40) << 1;
+		break;
+
+	case PSMOUSE_CORTRON:
+		/*
+		 * Cortron PS2 Trackball reports SIDE button in the
+		 * 4th bit of the first byte.
+		 */
+		input_report_key(dev, BTN_SIDE, packet[0] & BIT(3));
+		packet[0] |= BIT(3);
+		break;
+
+	default:
+		break;
+	}
+
+	/* Generic PS/2 Mouse */
+	packet[0] |= psmouse->extra_buttons;
+	psmouse_report_standard_packet(dev, packet);
+
+	input_sync(dev);
+
+	return PSMOUSE_FULL_PACKET;
+}
+
+void psmouse_queue_work(struct psmouse *psmouse, struct delayed_work *work,
+		unsigned long delay)
+{
+	queue_delayed_work(kpsmoused_wq, work, delay);
+}
+
+/*
+ * __psmouse_set_state() sets new psmouse state and resets all flags.
+ */
+static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
+{
+	psmouse->state = new_state;
+	psmouse->pktcnt = psmouse->out_of_sync_cnt = 0;
+	psmouse->ps2dev.flags = 0;
+	psmouse->last = jiffies;
+}
+
+/*
+ * psmouse_set_state() sets new psmouse state and resets all flags and
+ * counters while holding serio lock so fighting with interrupt handler
+ * is not a concern.
+ */
+void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
+{
+	serio_pause_rx(psmouse->ps2dev.serio);
+	__psmouse_set_state(psmouse, new_state);
+	serio_continue_rx(psmouse->ps2dev.serio);
+}
+
+/*
+ * psmouse_handle_byte() processes one byte of the input data stream
+ * by calling corresponding protocol handler.
+ */
+static int psmouse_handle_byte(struct psmouse *psmouse)
+{
+	psmouse_ret_t rc = psmouse->protocol_handler(psmouse);
+
+	switch (rc) {
+	case PSMOUSE_BAD_DATA:
+		if (psmouse->state == PSMOUSE_ACTIVATED) {
+			psmouse_warn(psmouse,
+				     "%s at %s lost sync at byte %d\n",
+				     psmouse->name, psmouse->phys,
+				     psmouse->pktcnt);
+			if (++psmouse->out_of_sync_cnt == psmouse->resetafter) {
+				__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
+				psmouse_notice(psmouse,
+						"issuing reconnect request\n");
+				serio_reconnect(psmouse->ps2dev.serio);
+				return -EIO;
+			}
+		}
+		psmouse->pktcnt = 0;
+		break;
+
+	case PSMOUSE_FULL_PACKET:
+		psmouse->pktcnt = 0;
+		if (psmouse->out_of_sync_cnt) {
+			psmouse->out_of_sync_cnt = 0;
+			psmouse_notice(psmouse,
+					"%s at %s - driver resynced.\n",
+					psmouse->name, psmouse->phys);
+		}
+		break;
+
+	case PSMOUSE_GOOD_DATA:
+		break;
+	}
+	return 0;
+}
+
+static void psmouse_handle_oob_data(struct psmouse *psmouse, u8 data)
+{
+	switch (psmouse->oob_data_type) {
+	case PSMOUSE_OOB_NONE:
+		psmouse->oob_data_type = data;
+		break;
+
+	case PSMOUSE_OOB_EXTRA_BTNS:
+		psmouse_report_standard_buttons(psmouse->dev, data);
+		input_sync(psmouse->dev);
+
+		psmouse->extra_buttons = data;
+		psmouse->oob_data_type = PSMOUSE_OOB_NONE;
+		break;
+
+	default:
+		psmouse_warn(psmouse,
+			     "unknown OOB_DATA type: 0x%02x\n",
+			     psmouse->oob_data_type);
+		psmouse->oob_data_type = PSMOUSE_OOB_NONE;
+		break;
+	}
+}
+
+/*
+ * psmouse_interrupt() handles incoming characters, either passing them
+ * for normal processing or gathering them as command response.
+ */
+static irqreturn_t psmouse_interrupt(struct serio *serio,
+				     u8 data, unsigned int flags)
+{
+	struct psmouse *psmouse = serio_get_drvdata(serio);
+
+	if (psmouse->state == PSMOUSE_IGNORE)
+		goto out;
+
+	if (unlikely((flags & SERIO_TIMEOUT) ||
+		     ((flags & SERIO_PARITY) &&
+		      !psmouse->protocol->ignore_parity))) {
+
+		if (psmouse->state == PSMOUSE_ACTIVATED)
+			psmouse_warn(psmouse,
+				     "bad data from KBC -%s%s\n",
+				     flags & SERIO_TIMEOUT ? " timeout" : "",
+				     flags & SERIO_PARITY ? " bad parity" : "");
+		ps2_cmd_aborted(&psmouse->ps2dev);
+		goto out;
+	}
+
+	if (flags & SERIO_OOB_DATA) {
+		psmouse_handle_oob_data(psmouse, data);
+		goto out;
+	}
+
+	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
+		if  (ps2_handle_ack(&psmouse->ps2dev, data))
+			goto out;
+
+	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
+		if  (ps2_handle_response(&psmouse->ps2dev, data))
+			goto out;
+
+	pm_wakeup_event(&serio->dev, 0);
+
+	if (psmouse->state <= PSMOUSE_RESYNCING)
+		goto out;
+
+	if (psmouse->state == PSMOUSE_ACTIVATED &&
+	    psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
+		psmouse_info(psmouse, "%s at %s lost synchronization, throwing %d bytes away.\n",
+			     psmouse->name, psmouse->phys, psmouse->pktcnt);
+		psmouse->badbyte = psmouse->packet[0];
+		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
+		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
+		goto out;
+	}
+
+	psmouse->packet[psmouse->pktcnt++] = data;
+
+	/* Check if this is a new device announcement (0xAA 0x00) */
+	if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
+		if (psmouse->pktcnt == 1) {
+			psmouse->last = jiffies;
+			goto out;
+		}
+
+		if (psmouse->packet[1] == PSMOUSE_RET_ID ||
+		    (psmouse->protocol->type == PSMOUSE_HGPK &&
+		     psmouse->packet[1] == PSMOUSE_RET_BAT)) {
+			__psmouse_set_state(psmouse, PSMOUSE_IGNORE);
+			serio_reconnect(serio);
+			goto out;
+		}
+
+		/* Not a new device, try processing first byte normally */
+		psmouse->pktcnt = 1;
+		if (psmouse_handle_byte(psmouse))
+			goto out;
+
+		psmouse->packet[psmouse->pktcnt++] = data;
+	}
+
+	/*
+	 * See if we need to force resync because mouse was idle for
+	 * too long.
+	 */
+	if (psmouse->state == PSMOUSE_ACTIVATED &&
+	    psmouse->pktcnt == 1 && psmouse->resync_time &&
+	    time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
+		psmouse->badbyte = psmouse->packet[0];
+		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
+		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);
+		goto out;
+	}
+
+	psmouse->last = jiffies;
+	psmouse_handle_byte(psmouse);
+
+ out:
+	return IRQ_HANDLED;
+}
+
+/*
+ * psmouse_reset() resets the mouse into power-on state.
+ */
+int psmouse_reset(struct psmouse *psmouse)
+{
+	u8 param[2];
+	int error;
+
+	error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT);
+	if (error)
+		return error;
+
+	if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
+		return -EIO;
+
+	return 0;
+}
+
+/*
+ * Here we set the mouse resolution.
+ */
+void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
+{
+	static const u8 params[] = { 0, 1, 2, 2, 3 };
+	u8 p;
+
+	if (resolution == 0 || resolution > 200)
+		resolution = 200;
+
+	p = params[resolution / 50];
+	ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
+	psmouse->resolution = 25 << p;
+}
+
+/*
+ * Here we set the mouse report rate.
+ */
+static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
+{
+	static const u8 rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
+	u8 r;
+	int i = 0;
+
+	while (rates[i] > rate)
+		i++;
+	r = rates[i];
+	ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
+	psmouse->rate = r;
+}
+
+/*
+ * Here we set the mouse scaling.
+ */
+static void psmouse_set_scale(struct psmouse *psmouse, enum psmouse_scale scale)
+{
+	ps2_command(&psmouse->ps2dev, NULL,
+		    scale == PSMOUSE_SCALE21 ? PSMOUSE_CMD_SETSCALE21 :
+					       PSMOUSE_CMD_SETSCALE11);
+}
+
+/*
+ * psmouse_poll() - default poll handler. Everyone except for ALPS uses it.
+ */
+static int psmouse_poll(struct psmouse *psmouse)
+{
+	return ps2_command(&psmouse->ps2dev, psmouse->packet,
+			   PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
+}
+
+static bool psmouse_check_pnp_id(const char *id, const char * const ids[])
+{
+	int i;
+
+	for (i = 0; ids[i]; i++)
+		if (!strcasecmp(id, ids[i]))
+			return true;
+
+	return false;
+}
+
+/*
+ * psmouse_matches_pnp_id - check if psmouse matches one of the passed in ids.
+ */
+bool psmouse_matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
+{
+	struct serio *serio = psmouse->ps2dev.serio;
+	char *p, *fw_id_copy, *save_ptr;
+	bool found = false;
+
+	if (strncmp(serio->firmware_id, "PNP: ", 5))
+		return false;
+
+	fw_id_copy = kstrndup(&serio->firmware_id[5],
+			      sizeof(serio->firmware_id) - 5,
+			      GFP_KERNEL);
+	if (!fw_id_copy)
+		return false;
+
+	save_ptr = fw_id_copy;
+	while ((p = strsep(&fw_id_copy, " ")) != NULL) {
+		if (psmouse_check_pnp_id(p, ids)) {
+			found = true;
+			break;
+		}
+	}
+
+	kfree(save_ptr);
+	return found;
+}
+
+/*
+ * Genius NetMouse magic init.
+ */
+static int genius_detect(struct psmouse *psmouse, bool set_properties)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	u8 param[4];
+
+	param[0] = 3;
+	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);
+	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
+
+	if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
+		return -ENODEV;
+
+	if (set_properties) {
+		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
+		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
+		__set_bit(BTN_SIDE, psmouse->dev->keybit);
+		__set_bit(REL_WHEEL, psmouse->dev->relbit);
+
+		psmouse->vendor = "Genius";
+		psmouse->name = "Mouse";
+		psmouse->pktsize = 4;
+	}
+
+	return 0;
+}
+
+/*
+ * IntelliMouse magic init.
+ */
+static int intellimouse_detect(struct psmouse *psmouse, bool set_properties)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	u8 param[2];
+
+	param[0] = 200;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	param[0] = 100;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	param[0] =  80;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
+
+	if (param[0] != 3)
+		return -ENODEV;
+
+	if (set_properties) {
+		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
+		__set_bit(REL_WHEEL, psmouse->dev->relbit);
+
+		if (!psmouse->vendor)
+			psmouse->vendor = "Generic";
+		if (!psmouse->name)
+			psmouse->name = "Wheel Mouse";
+		psmouse->pktsize = 4;
+	}
+
+	return 0;
+}
+
+/*
+ * Try IntelliMouse/Explorer magic init.
+ */
+static int im_explorer_detect(struct psmouse *psmouse, bool set_properties)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	u8 param[2];
+
+	intellimouse_detect(psmouse, 0);
+
+	param[0] = 200;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	param[0] = 200;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	param[0] =  80;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
+
+	if (param[0] != 4)
+		return -ENODEV;
+
+	/* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
+	param[0] = 200;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	param[0] =  80;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	param[0] =  40;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+
+	if (set_properties) {
+		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
+		__set_bit(REL_WHEEL, psmouse->dev->relbit);
+		__set_bit(REL_HWHEEL, psmouse->dev->relbit);
+		__set_bit(BTN_SIDE, psmouse->dev->keybit);
+		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
+
+		if (!psmouse->vendor)
+			psmouse->vendor = "Generic";
+		if (!psmouse->name)
+			psmouse->name = "Explorer Mouse";
+		psmouse->pktsize = 4;
+	}
+
+	return 0;
+}
+
+/*
+ * Kensington ThinkingMouse / ExpertMouse magic init.
+ */
+static int thinking_detect(struct psmouse *psmouse, bool set_properties)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	u8 param[2];
+	static const u8 seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
+	int i;
+
+	param[0] = 10;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	param[0] = 0;
+	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
+	for (i = 0; i < ARRAY_SIZE(seq); i++) {
+		param[0] = seq[i];
+		ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
+	}
+	ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
+
+	if (param[0] != 2)
+		return -ENODEV;
+
+	if (set_properties) {
+		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
+		__set_bit(BTN_EXTRA, psmouse->dev->keybit);
+
+		psmouse->vendor = "Kensington";
+		psmouse->name = "ThinkingMouse";
+	}
+
+	return 0;
+}
+
+/*
+ * Bare PS/2 protocol "detection". Always succeeds.
+ */
+static int ps2bare_detect(struct psmouse *psmouse, bool set_properties)
+{
+	if (set_properties) {
+		if (!psmouse->vendor)
+			psmouse->vendor = "Generic";
+		if (!psmouse->name)
+			psmouse->name = "Mouse";
+
+		/*
+		 * We have no way of figuring true number of buttons so let's
+		 * assume that the device has 3.
+		 */
+		input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
+	}
+
+	return 0;
+}
+
+/*
+ * Cortron PS/2 protocol detection. There's no special way to detect it, so it
+ * must be forced by sysfs protocol writing.
+ */
+static int cortron_detect(struct psmouse *psmouse, bool set_properties)
+{
+	if (set_properties) {
+		psmouse->vendor = "Cortron";
+		psmouse->name = "PS/2 Trackball";
+
+		__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
+		__set_bit(BTN_SIDE, psmouse->dev->keybit);
+	}
+
+	return 0;
+}
+
+static const struct psmouse_protocol psmouse_protocols[] = {
+	{
+		.type		= PSMOUSE_PS2,
+		.name		= "PS/2",
+		.alias		= "bare",
+		.maxproto	= true,
+		.ignore_parity	= true,
+		.detect		= ps2bare_detect,
+		.try_passthru	= true,
+	},
+#ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
+	{
+		.type		= PSMOUSE_PS2PP,
+		.name		= "PS2++",
+		.alias		= "logitech",
+		.detect		= ps2pp_detect,
+	},
+#endif
+	{
+		.type		= PSMOUSE_THINKPS,
+		.name		= "ThinkPS/2",
+		.alias		= "thinkps",
+		.detect		= thinking_detect,
+	},
+#ifdef CONFIG_MOUSE_PS2_CYPRESS
+	{
+		.type		= PSMOUSE_CYPRESS,
+		.name		= "CyPS/2",
+		.alias		= "cypress",
+		.detect		= cypress_detect,
+		.init		= cypress_init,
+	},
+#endif
+	{
+		.type		= PSMOUSE_GENPS,
+		.name		= "GenPS/2",
+		.alias		= "genius",
+		.detect		= genius_detect,
+	},
+	{
+		.type		= PSMOUSE_IMPS,
+		.name		= "ImPS/2",
+		.alias		= "imps",
+		.maxproto	= true,
+		.ignore_parity	= true,
+		.detect		= intellimouse_detect,
+		.try_passthru	= true,
+	},
+	{
+		.type		= PSMOUSE_IMEX,
+		.name		= "ImExPS/2",
+		.alias		= "exps",
+		.maxproto	= true,
+		.ignore_parity	= true,
+		.detect		= im_explorer_detect,
+		.try_passthru	= true,
+	},
+#ifdef CONFIG_MOUSE_PS2_SYNAPTICS
+	{
+		.type		= PSMOUSE_SYNAPTICS,
+		.name		= "SynPS/2",
+		.alias		= "synaptics",
+		.detect		= synaptics_detect,
+		.init		= synaptics_init_absolute,
+	},
+	{
+		.type		= PSMOUSE_SYNAPTICS_RELATIVE,
+		.name		= "SynRelPS/2",
+		.alias		= "synaptics-relative",
+		.detect		= synaptics_detect,
+		.init		= synaptics_init_relative,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
+	{
+		.type		= PSMOUSE_SYNAPTICS_SMBUS,
+		.name		= "SynSMBus",
+		.alias		= "synaptics-smbus",
+		.detect		= synaptics_detect,
+		.init		= synaptics_init_smbus,
+		.smbus_companion = true,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_ALPS
+	{
+		.type		= PSMOUSE_ALPS,
+		.name		= "AlpsPS/2",
+		.alias		= "alps",
+		.detect		= alps_detect,
+		.init		= alps_init,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_LIFEBOOK
+	{
+		.type		= PSMOUSE_LIFEBOOK,
+		.name		= "LBPS/2",
+		.alias		= "lifebook",
+		.detect		= lifebook_detect,
+		.init		= lifebook_init,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_TRACKPOINT
+	{
+		.type		= PSMOUSE_TRACKPOINT,
+		.name		= "TPPS/2",
+		.alias		= "trackpoint",
+		.detect		= trackpoint_detect,
+		.try_passthru	= true,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_TOUCHKIT
+	{
+		.type		= PSMOUSE_TOUCHKIT_PS2,
+		.name		= "touchkitPS/2",
+		.alias		= "touchkit",
+		.detect		= touchkit_ps2_detect,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_OLPC
+	{
+		.type		= PSMOUSE_HGPK,
+		.name		= "OLPC HGPK",
+		.alias		= "hgpk",
+		.detect		= hgpk_detect,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_ELANTECH
+	{
+		.type		= PSMOUSE_ELANTECH,
+		.name		= "ETPS/2",
+		.alias		= "elantech",
+		.detect		= elantech_detect,
+		.init		= elantech_init_ps2,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_ELANTECH_SMBUS
+	{
+		.type		= PSMOUSE_ELANTECH_SMBUS,
+		.name		= "ETSMBus",
+		.alias		= "elantech-smbus",
+		.detect		= elantech_detect,
+		.init		= elantech_init_smbus,
+		.smbus_companion = true,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_SENTELIC
+	{
+		.type		= PSMOUSE_FSP,
+		.name		= "FSPPS/2",
+		.alias		= "fsp",
+		.detect		= fsp_detect,
+		.init		= fsp_init,
+	},
+#endif
+	{
+		.type		= PSMOUSE_CORTRON,
+		.name		= "CortronPS/2",
+		.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
+#ifdef CONFIG_MOUSE_PS2_VMMOUSE
+	{
+		.type		= PSMOUSE_VMMOUSE,
+		.name		= VMMOUSE_PSNAME,
+		.alias		= "vmmouse",
+		.detect		= vmmouse_detect,
+		.init		= vmmouse_init,
+	},
+#endif
+#ifdef CONFIG_MOUSE_PS2_BYD
+	{
+		.type		= PSMOUSE_BYD,
+		.name		= "BYDPS/2",
+		.alias		= "byd",
+		.detect		= byd_detect,
+		.init		= byd_init,
+	},
+#endif
+	{
+		.type		= PSMOUSE_AUTO,
+		.name		= "auto",
+		.alias		= "any",
+		.maxproto	= true,
+	},
+};
+
+static const struct psmouse_protocol *__psmouse_protocol_by_type(enum psmouse_type type)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
+		if (psmouse_protocols[i].type == type)
+			return &psmouse_protocols[i];
+
+	return NULL;
+}
+
+static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
+{
+	const struct psmouse_protocol *proto;
+
+	proto = __psmouse_protocol_by_type(type);
+	if (proto)
+		return proto;
+
+	WARN_ON(1);
+	return &psmouse_protocols[0];
+}
+
+static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
+{
+	const struct psmouse_protocol *p;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
+		p = &psmouse_protocols[i];
+
+		if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
+		    (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
+			return &psmouse_protocols[i];
+	}
+
+	return NULL;
+}
+
+/*
+ * Apply default settings to the psmouse structure. Most of them will
+ * be overridden by individual protocol initialization routines.
+ */
+static void psmouse_apply_defaults(struct psmouse *psmouse)
+{
+	struct input_dev *input_dev = psmouse->dev;
+
+	bitmap_zero(input_dev->evbit, EV_CNT);
+	bitmap_zero(input_dev->keybit, KEY_CNT);
+	bitmap_zero(input_dev->relbit, REL_CNT);
+	bitmap_zero(input_dev->absbit, ABS_CNT);
+	bitmap_zero(input_dev->mscbit, MSC_CNT);
+
+	input_set_capability(input_dev, EV_KEY, BTN_LEFT);
+	input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
+
+	input_set_capability(input_dev, EV_REL, REL_X);
+	input_set_capability(input_dev, EV_REL, REL_Y);
+
+	__set_bit(INPUT_PROP_POINTER, input_dev->propbit);
+
+	psmouse->protocol = &psmouse_protocols[0];
+
+	psmouse->set_rate = psmouse_set_rate;
+	psmouse->set_resolution = psmouse_set_resolution;
+	psmouse->set_scale = psmouse_set_scale;
+	psmouse->poll = psmouse_poll;
+	psmouse->protocol_handler = psmouse_process_byte;
+	psmouse->pktsize = 3;
+	psmouse->reconnect = NULL;
+	psmouse->fast_reconnect = NULL;
+	psmouse->disconnect = NULL;
+	psmouse->cleanup = NULL;
+	psmouse->pt_activate = NULL;
+	psmouse->pt_deactivate = NULL;
+}
+
+static bool psmouse_do_detect(int (*detect)(struct psmouse *, bool),
+			      struct psmouse *psmouse, bool allow_passthrough,
+			      bool set_properties)
+{
+	if (psmouse->ps2dev.serio->id.type == SERIO_PS_PSTHRU &&
+	    !allow_passthrough) {
+		return false;
+	}
+
+	if (set_properties)
+		psmouse_apply_defaults(psmouse);
+
+	return detect(psmouse, set_properties) == 0;
+}
+
+static bool psmouse_try_protocol(struct psmouse *psmouse,
+				 enum psmouse_type type,
+				 unsigned int *max_proto,
+				 bool set_properties, bool init_allowed)
+{
+	const struct psmouse_protocol *proto;
+
+	proto = __psmouse_protocol_by_type(type);
+	if (!proto)
+		return false;
+
+	if (!psmouse_do_detect(proto->detect, psmouse, proto->try_passthru,
+			       set_properties))
+		return false;
+
+	if (set_properties && proto->init && init_allowed) {
+		if (proto->init(psmouse) != 0) {
+			/*
+			 * We detected device, but init failed. Adjust
+			 * max_proto so we only try standard protocols.
+			 */
+			if (*max_proto > PSMOUSE_IMEX)
+				*max_proto = PSMOUSE_IMEX;
+
+			return false;
+		}
+	}
+
+	return true;
+}
+
+/*
+ * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
+ * the mouse may have.
+ */
+static int psmouse_extensions(struct psmouse *psmouse,
+			      unsigned int max_proto, bool set_properties)
+{
+	bool synaptics_hardware = false;
+	int ret;
+
+	/*
+	 * Always check for focaltech, this is safe as it uses pnp-id
+	 * matching.
+	 */
+	if (psmouse_do_detect(focaltech_detect,
+			      psmouse, false, set_properties)) {
+		if (max_proto > PSMOUSE_IMEX &&
+		    IS_ENABLED(CONFIG_MOUSE_PS2_FOCALTECH) &&
+		    (!set_properties || focaltech_init(psmouse) == 0)) {
+			return PSMOUSE_FOCALTECH;
+		}
+		/*
+		 * Restrict psmouse_max_proto so that psmouse_initialize()
+		 * does not try to reset rate and resolution, because even
+		 * that upsets the device.
+		 * This also causes us to basically fall through to basic
+		 * protocol detection, where we fully reset the mouse,
+		 * and set it up as bare PS/2 protocol device.
+		 */
+		psmouse_max_proto = max_proto = PSMOUSE_PS2;
+	}
+
+	/*
+	 * We always check for LifeBook because it does not disturb mouse
+	 * (it only checks DMI information).
+	 */
+	if (psmouse_try_protocol(psmouse, PSMOUSE_LIFEBOOK, &max_proto,
+				 set_properties, max_proto > PSMOUSE_IMEX))
+		return PSMOUSE_LIFEBOOK;
+
+	if (psmouse_try_protocol(psmouse, PSMOUSE_VMMOUSE, &max_proto,
+				 set_properties, max_proto > PSMOUSE_IMEX))
+		return PSMOUSE_VMMOUSE;
+
+	/*
+	 * Try Kensington ThinkingMouse (we try first, because Synaptics
+	 * probe upsets the ThinkingMouse).
+	 */
+	if (max_proto > PSMOUSE_IMEX &&
+	    psmouse_try_protocol(psmouse, PSMOUSE_THINKPS, &max_proto,
+				 set_properties, true)) {
+		return PSMOUSE_THINKPS;
+	}
+
+	/*
+	 * Try Synaptics TouchPad. Note that probing is done even if
+	 * Synaptics protocol support is disabled in config - we need to
+	 * know if it is Synaptics so we can reset it properly after
+	 * probing for IntelliMouse.
+	 */
+	if (max_proto > PSMOUSE_PS2 &&
+	    psmouse_do_detect(synaptics_detect,
+			      psmouse, false, set_properties)) {
+		synaptics_hardware = true;
+
+		if (max_proto > PSMOUSE_IMEX) {
+			/*
+			 * Try activating protocol, but check if support is
+			 * enabled first, since we try detecting Synaptics
+			 * even when protocol is disabled.
+			 */
+			if (IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS) ||
+			    IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) {
+				if (!set_properties)
+					return PSMOUSE_SYNAPTICS;
+
+				ret = synaptics_init(psmouse);
+				if (ret >= 0)
+					return ret;
+			}
+
+			/*
+			 * Some Synaptics touchpads can emulate extended
+			 * protocols (like IMPS/2).  Unfortunately
+			 * Logitech/Genius probes confuse some firmware
+			 * versions so we'll have to skip them.
+			 */
+			max_proto = PSMOUSE_IMEX;
+		}
+
+		/*
+		 * Make sure that touchpad is in relative mode, gestures
+		 * (taps) are enabled.
+		 */
+		synaptics_reset(psmouse);
+	}
+
+	/*
+	 * Try Cypress Trackpad. We must try it before Finger Sensing Pad
+	 * because Finger Sensing Pad probe upsets some modules of Cypress
+	 * Trackpads.
+	 */
+	if (max_proto > PSMOUSE_IMEX &&
+	    psmouse_try_protocol(psmouse, PSMOUSE_CYPRESS, &max_proto,
+				 set_properties, true)) {
+		return PSMOUSE_CYPRESS;
+	}
+
+	/* Try ALPS TouchPad */
+	if (max_proto > PSMOUSE_IMEX) {
+		ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
+		if (psmouse_try_protocol(psmouse, PSMOUSE_ALPS,
+					 &max_proto, set_properties, true))
+			return PSMOUSE_ALPS;
+	}
+
+	/* Try OLPC HGPK touchpad */
+	if (max_proto > PSMOUSE_IMEX &&
+	    psmouse_try_protocol(psmouse, PSMOUSE_HGPK, &max_proto,
+				 set_properties, true)) {
+		return PSMOUSE_HGPK;
+	}
+
+	/* Try Elantech touchpad */
+	if (max_proto > PSMOUSE_IMEX &&
+	    psmouse_try_protocol(psmouse, PSMOUSE_ELANTECH,
+				 &max_proto, set_properties, false)) {
+		if (!set_properties)
+			return PSMOUSE_ELANTECH;
+
+		ret = elantech_init(psmouse);
+		if (ret >= 0)
+			return ret;
+	}
+
+	if (max_proto > PSMOUSE_IMEX) {
+		if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
+					 &max_proto, set_properties, true))
+			return PSMOUSE_GENPS;
+
+		if (psmouse_try_protocol(psmouse, PSMOUSE_PS2PP,
+					 &max_proto, set_properties, true))
+			return PSMOUSE_PS2PP;
+
+		if (psmouse_try_protocol(psmouse, PSMOUSE_TRACKPOINT,
+					 &max_proto, set_properties, true))
+			return PSMOUSE_TRACKPOINT;
+
+		if (psmouse_try_protocol(psmouse, PSMOUSE_TOUCHKIT_PS2,
+					 &max_proto, set_properties, true))
+			return PSMOUSE_TOUCHKIT_PS2;
+	}
+
+	/*
+	 * Try Finger Sensing Pad. We do it here because its probe upsets
+	 * Trackpoint devices (causing TP_READ_ID command to time out).
+	 */
+	if (max_proto > PSMOUSE_IMEX &&
+	    psmouse_try_protocol(psmouse, PSMOUSE_FSP,
+				 &max_proto, set_properties, true)) {
+		return PSMOUSE_FSP;
+	}
+
+	/*
+	 * Reset to defaults in case the device got confused by extended
+	 * protocol probes. Note that we follow up with full reset because
+	 * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
+	 */
+	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
+	psmouse_reset(psmouse);
+
+	if (max_proto >= PSMOUSE_IMEX &&
+	    psmouse_try_protocol(psmouse, PSMOUSE_IMEX,
+				 &max_proto, set_properties, true)) {
+		return PSMOUSE_IMEX;
+	}
+
+	if (max_proto >= PSMOUSE_IMPS &&
+	    psmouse_try_protocol(psmouse, PSMOUSE_IMPS,
+				 &max_proto, set_properties, true)) {
+		return PSMOUSE_IMPS;
+	}
+
+	/*
+	 * Okay, all failed, we have a standard mouse here. The number of
+	 * the buttons is still a question, though. We assume 3.
+	 */
+	psmouse_try_protocol(psmouse, PSMOUSE_PS2,
+			     &max_proto, set_properties, true);
+
+	if (synaptics_hardware) {
+		/*
+		 * We detected Synaptics hardware but it did not respond to
+		 * IMPS/2 probes.  We need to reset the touchpad because if
+		 * there is a track point on the pass through port it could
+		 * get disabled while probing for protocol extensions.
+		 */
+		psmouse_reset(psmouse);
+	}
+
+	return PSMOUSE_PS2;
+}
+
+/*
+ * psmouse_probe() probes for a PS/2 mouse.
+ */
+static int psmouse_probe(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	u8 param[2];
+	int error;
+
+	/*
+	 * First, we check if it's a mouse. It should send 0x00 or 0x03 in
+	 * case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
+	 * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and
+	 * subsequent ID queries, probably due to a firmware bug.
+	 */
+	param[0] = 0xa5;
+	error = ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);
+	if (error)
+		return error;
+
+	if (param[0] != 0x00 && param[0] != 0x03 &&
+	    param[0] != 0x04 && param[0] != 0xff)
+		return -ENODEV;
+
+	/*
+	 * Then we reset and disable the mouse so that it doesn't generate
+	 * events.
+	 */
+	error = ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
+	if (error)
+		psmouse_warn(psmouse, "Failed to reset mouse on %s: %d\n",
+			     ps2dev->serio->phys, error);
+
+	return 0;
+}
+
+/*
+ * psmouse_initialize() initializes the mouse to a sane state.
+ */
+static void psmouse_initialize(struct psmouse *psmouse)
+{
+	/*
+	 * We set the mouse report rate, resolution and scaling.
+	 */
+	if (psmouse_max_proto != PSMOUSE_PS2) {
+		psmouse->set_rate(psmouse, psmouse->rate);
+		psmouse->set_resolution(psmouse, psmouse->resolution);
+		psmouse->set_scale(psmouse, PSMOUSE_SCALE11);
+	}
+}
+
+/*
+ * psmouse_activate() enables the mouse so that we get motion reports from it.
+ */
+int psmouse_activate(struct psmouse *psmouse)
+{
+	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
+		psmouse_warn(psmouse, "Failed to enable mouse on %s\n",
+			     psmouse->ps2dev.serio->phys);
+		return -1;
+	}
+
+	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
+	return 0;
+}
+
+/*
+ * psmouse_deactivate() puts the mouse into poll mode so that we don't get
+ * motion reports from it unless we explicitly request it.
+ */
+int psmouse_deactivate(struct psmouse *psmouse)
+{
+	int error;
+
+	error = ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE);
+	if (error) {
+		psmouse_warn(psmouse, "Failed to deactivate mouse on %s: %d\n",
+			     psmouse->ps2dev.serio->phys, error);
+		return error;
+	}
+
+	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+	return 0;
+}
+
+/*
+ * psmouse_resync() attempts to re-validate current protocol.
+ */
+static void psmouse_resync(struct work_struct *work)
+{
+	struct psmouse *parent = NULL, *psmouse =
+		container_of(work, struct psmouse, resync_work.work);
+	struct serio *serio = psmouse->ps2dev.serio;
+	psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
+	bool failed = false, enabled = false;
+	int i;
+
+	mutex_lock(&psmouse_mutex);
+
+	if (psmouse->state != PSMOUSE_RESYNCING)
+		goto out;
+
+	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
+		parent = serio_get_drvdata(serio->parent);
+		psmouse_deactivate(parent);
+	}
+
+	/*
+	 * Some mice don't ACK commands sent while they are in the middle of
+	 * transmitting motion packet. To avoid delay we use ps2_sendbyte()
+	 * instead of ps2_command() which would wait for 200ms for an ACK
+	 * that may never come.
+	 * As an additional quirk ALPS touchpads may not only forget to ACK
+	 * disable command but will stop reporting taps, so if we see that
+	 * mouse at least once ACKs disable we will do full reconnect if ACK
+	 * is missing.
+	 */
+	psmouse->num_resyncs++;
+
+	if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
+		if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
+			failed = true;
+	} else
+		psmouse->acks_disable_command = true;
+
+	/*
+	 * Poll the mouse. If it was reset the packet will be shorter than
+	 * psmouse->pktsize and ps2_command will fail. We do not expect and
+	 * do not handle scenario when mouse "upgrades" its protocol while
+	 * disconnected since it would require additional delay. If we ever
+	 * see a mouse that does it we'll adjust the code.
+	 */
+	if (!failed) {
+		if (psmouse->poll(psmouse))
+			failed = true;
+		else {
+			psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+			for (i = 0; i < psmouse->pktsize; i++) {
+				psmouse->pktcnt++;
+				rc = psmouse->protocol_handler(psmouse);
+				if (rc != PSMOUSE_GOOD_DATA)
+					break;
+			}
+			if (rc != PSMOUSE_FULL_PACKET)
+				failed = true;
+			psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
+		}
+	}
+
+	/*
+	 * Now try to enable mouse. We try to do that even if poll failed
+	 * and also repeat our attempts 5 times, otherwise we may be left
+	 * out with disabled mouse.
+	 */
+	for (i = 0; i < 5; i++) {
+		if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
+			enabled = true;
+			break;
+		}
+		msleep(200);
+	}
+
+	if (!enabled) {
+		psmouse_warn(psmouse, "failed to re-enable mouse on %s\n",
+			     psmouse->ps2dev.serio->phys);
+		failed = true;
+	}
+
+	if (failed) {
+		psmouse_set_state(psmouse, PSMOUSE_IGNORE);
+		psmouse_info(psmouse,
+			     "resync failed, issuing reconnect request\n");
+		serio_reconnect(serio);
+	} else
+		psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
+
+	if (parent)
+		psmouse_activate(parent);
+ out:
+	mutex_unlock(&psmouse_mutex);
+}
+
+/*
+ * psmouse_cleanup() resets the mouse into power-on state.
+ */
+static void psmouse_cleanup(struct serio *serio)
+{
+	struct psmouse *psmouse = serio_get_drvdata(serio);
+	struct psmouse *parent = NULL;
+
+	mutex_lock(&psmouse_mutex);
+
+	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
+		parent = serio_get_drvdata(serio->parent);
+		psmouse_deactivate(parent);
+	}
+
+	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
+
+	/*
+	 * Disable stream mode so cleanup routine can proceed undisturbed.
+	 */
+	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
+		psmouse_warn(psmouse, "Failed to disable mouse on %s\n",
+			     psmouse->ps2dev.serio->phys);
+
+	if (psmouse->cleanup)
+		psmouse->cleanup(psmouse);
+
+	/*
+	 * Reset the mouse to defaults (bare PS/2 protocol).
+	 */
+	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
+
+	/*
+	 * Some boxes, such as HP nx7400, get terribly confused if mouse
+	 * is not fully enabled before suspending/shutting down.
+	 */
+	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);
+
+	if (parent) {
+		if (parent->pt_deactivate)
+			parent->pt_deactivate(parent);
+
+		psmouse_activate(parent);
+	}
+
+	mutex_unlock(&psmouse_mutex);
+}
+
+/*
+ * psmouse_disconnect() closes and frees.
+ */
+static void psmouse_disconnect(struct serio *serio)
+{
+	struct psmouse *psmouse = serio_get_drvdata(serio);
+	struct psmouse *parent = NULL;
+
+	mutex_lock(&psmouse_mutex);
+
+	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+
+	/* make sure we don't have a resync in progress */
+	mutex_unlock(&psmouse_mutex);
+	flush_workqueue(kpsmoused_wq);
+	mutex_lock(&psmouse_mutex);
+
+	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
+		parent = serio_get_drvdata(serio->parent);
+		psmouse_deactivate(parent);
+	}
+
+	if (psmouse->disconnect)
+		psmouse->disconnect(psmouse);
+
+	if (parent && parent->pt_deactivate)
+		parent->pt_deactivate(parent);
+
+	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
+
+	serio_close(serio);
+	serio_set_drvdata(serio, NULL);
+
+	if (psmouse->dev)
+		input_unregister_device(psmouse->dev);
+
+	kfree(psmouse);
+
+	if (parent)
+		psmouse_activate(parent);
+
+	mutex_unlock(&psmouse_mutex);
+}
+
+static int psmouse_switch_protocol(struct psmouse *psmouse,
+				   const struct psmouse_protocol *proto)
+{
+	const struct psmouse_protocol *selected_proto;
+	struct input_dev *input_dev = psmouse->dev;
+	enum psmouse_type type;
+
+	input_dev->dev.parent = &psmouse->ps2dev.serio->dev;
+
+	if (proto && (proto->detect || proto->init)) {
+		psmouse_apply_defaults(psmouse);
+
+		if (proto->detect && proto->detect(psmouse, true) < 0)
+			return -1;
+
+		if (proto->init && proto->init(psmouse) < 0)
+			return -1;
+
+		selected_proto = proto;
+	} else {
+		type = psmouse_extensions(psmouse, psmouse_max_proto, true);
+		selected_proto = psmouse_protocol_by_type(type);
+	}
+
+	psmouse->protocol = selected_proto;
+
+	/*
+	 * If mouse's packet size is 3 there is no point in polling the
+	 * device in hopes to detect protocol reset - we won't get less
+	 * than 3 bytes response anyhow.
+	 */
+	if (psmouse->pktsize == 3)
+		psmouse->resync_time = 0;
+
+	/*
+	 * Some smart KVMs fake response to POLL command returning just
+	 * 3 bytes and messing up our resync logic, so if initial poll
+	 * fails we won't try polling the device anymore. Hopefully
+	 * such KVM will maintain initially selected protocol.
+	 */
+	if (psmouse->resync_time && psmouse->poll(psmouse))
+		psmouse->resync_time = 0;
+
+	snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
+		 selected_proto->name, psmouse->vendor, psmouse->name);
+
+	input_dev->name = psmouse->devname;
+	input_dev->phys = psmouse->phys;
+	input_dev->id.bustype = BUS_I8042;
+	input_dev->id.vendor = 0x0002;
+	input_dev->id.product = psmouse->protocol->type;
+	input_dev->id.version = psmouse->model;
+
+	return 0;
+}
+
+/*
+ * psmouse_connect() is a callback from the serio module when
+ * an unhandled serio port is found.
+ */
+static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
+{
+	struct psmouse *psmouse, *parent = NULL;
+	struct input_dev *input_dev;
+	int retval = 0, error = -ENOMEM;
+
+	mutex_lock(&psmouse_mutex);
+
+	/*
+	 * If this is a pass-through port deactivate parent so the device
+	 * connected to this port can be successfully identified
+	 */
+	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
+		parent = serio_get_drvdata(serio->parent);
+		psmouse_deactivate(parent);
+	}
+
+	psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
+	input_dev = input_allocate_device();
+	if (!psmouse || !input_dev)
+		goto err_free;
+
+	ps2_init(&psmouse->ps2dev, serio);
+	INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);
+	psmouse->dev = input_dev;
+	snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);
+
+	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
+
+	serio_set_drvdata(serio, psmouse);
+
+	error = serio_open(serio, drv);
+	if (error)
+		goto err_clear_drvdata;
+
+	/* give PT device some time to settle down before probing */
+	if (serio->id.type == SERIO_PS_PSTHRU)
+		usleep_range(10000, 15000);
+
+	if (psmouse_probe(psmouse) < 0) {
+		error = -ENODEV;
+		goto err_close_serio;
+	}
+
+	psmouse->rate = psmouse_rate;
+	psmouse->resolution = psmouse_resolution;
+	psmouse->resetafter = psmouse_resetafter;
+	psmouse->resync_time = parent ? 0 : psmouse_resync_time;
+	psmouse->smartscroll = psmouse_smartscroll;
+
+	psmouse_switch_protocol(psmouse, NULL);
+
+	if (!psmouse->protocol->smbus_companion) {
+		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+		psmouse_initialize(psmouse);
+
+		error = input_register_device(input_dev);
+		if (error)
+			goto err_protocol_disconnect;
+	} else {
+		/* Smbus companion will be reporting events, not us. */
+		input_free_device(input_dev);
+		psmouse->dev = input_dev = NULL;
+	}
+
+	if (parent && parent->pt_activate)
+		parent->pt_activate(parent);
+
+	/*
+	 * PS/2 devices having SMBus companions should stay disabled
+	 * on PS/2 side, in order to have SMBus part operable.
+	 */
+	if (!psmouse->protocol->smbus_companion)
+		psmouse_activate(psmouse);
+
+ out:
+	/* If this is a pass-through port the parent needs to be re-activated */
+	if (parent)
+		psmouse_activate(parent);
+
+	mutex_unlock(&psmouse_mutex);
+	return retval;
+
+ err_protocol_disconnect:
+	if (psmouse->disconnect)
+		psmouse->disconnect(psmouse);
+	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
+ err_close_serio:
+	serio_close(serio);
+ err_clear_drvdata:
+	serio_set_drvdata(serio, NULL);
+ err_free:
+	input_free_device(input_dev);
+	kfree(psmouse);
+
+	retval = error;
+	goto out;
+}
+
+static int __psmouse_reconnect(struct serio *serio, bool fast_reconnect)
+{
+	struct psmouse *psmouse = serio_get_drvdata(serio);
+	struct psmouse *parent = NULL;
+	int (*reconnect_handler)(struct psmouse *);
+	enum psmouse_type type;
+	int rc = -1;
+
+	mutex_lock(&psmouse_mutex);
+
+	if (fast_reconnect) {
+		reconnect_handler = psmouse->fast_reconnect;
+		if (!reconnect_handler) {
+			rc = -ENOENT;
+			goto out_unlock;
+		}
+	} else {
+		reconnect_handler = psmouse->reconnect;
+	}
+
+	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
+		parent = serio_get_drvdata(serio->parent);
+		psmouse_deactivate(parent);
+	}
+
+	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
+
+	if (reconnect_handler) {
+		if (reconnect_handler(psmouse))
+			goto out;
+	} else {
+		psmouse_reset(psmouse);
+
+		if (psmouse_probe(psmouse) < 0)
+			goto out;
+
+		type = psmouse_extensions(psmouse, psmouse_max_proto, false);
+		if (psmouse->protocol->type != type)
+			goto out;
+	}
+
+	/*
+	 * OK, the device type (and capabilities) match the old one,
+	 * we can continue using it, complete initialization
+	 */
+	if (!psmouse->protocol->smbus_companion) {
+		psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+		psmouse_initialize(psmouse);
+	}
+
+	if (parent && parent->pt_activate)
+		parent->pt_activate(parent);
+
+	/*
+	 * PS/2 devices having SMBus companions should stay disabled
+	 * on PS/2 side, in order to have SMBus part operable.
+	 */
+	if (!psmouse->protocol->smbus_companion)
+		psmouse_activate(psmouse);
+
+	rc = 0;
+
+out:
+	/* If this is a pass-through port the parent waits to be activated */
+	if (parent)
+		psmouse_activate(parent);
+
+out_unlock:
+	mutex_unlock(&psmouse_mutex);
+	return rc;
+}
+
+static int psmouse_reconnect(struct serio *serio)
+{
+	return __psmouse_reconnect(serio, false);
+}
+
+static int psmouse_fast_reconnect(struct serio *serio)
+{
+	return __psmouse_reconnect(serio, true);
+}
+
+static struct serio_device_id psmouse_serio_ids[] = {
+	{
+		.type	= SERIO_8042,
+		.proto	= SERIO_ANY,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{
+		.type	= SERIO_PS_PSTHRU,
+		.proto	= SERIO_ANY,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);
+
+static struct serio_driver psmouse_drv = {
+	.driver		= {
+		.name		= "psmouse",
+		.dev_groups	= psmouse_dev_groups,
+	},
+	.description	= DRIVER_DESC,
+	.id_table	= psmouse_serio_ids,
+	.interrupt	= psmouse_interrupt,
+	.connect	= psmouse_connect,
+	.reconnect	= psmouse_reconnect,
+	.fast_reconnect	= psmouse_fast_reconnect,
+	.disconnect	= psmouse_disconnect,
+	.cleanup	= psmouse_cleanup,
+};
+
+ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
+				 char *buf)
+{
+	struct serio *serio = to_serio_port(dev);
+	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
+	struct psmouse *psmouse = serio_get_drvdata(serio);
+
+	if (psmouse->protocol->smbus_companion &&
+			devattr != &psmouse_attr_protocol.dattr)
+		return -ENOENT;
+
+	return attr->show(psmouse, attr->data, buf);
+}
+
+ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
+				const char *buf, size_t count)
+{
+	struct serio *serio = to_serio_port(dev);
+	struct psmouse_attribute *attr = to_psmouse_attr(devattr);
+	struct psmouse *psmouse, *parent = NULL;
+	int retval;
+
+	retval = mutex_lock_interruptible(&psmouse_mutex);
+	if (retval)
+		goto out;
+
+	psmouse = serio_get_drvdata(serio);
+
+	if (psmouse->protocol->smbus_companion &&
+			devattr != &psmouse_attr_protocol.dattr) {
+		retval = -ENOENT;
+		goto out_unlock;
+	}
+
+	if (attr->protect) {
+		if (psmouse->state == PSMOUSE_IGNORE) {
+			retval = -ENODEV;
+			goto out_unlock;
+		}
+
+		if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
+			parent = serio_get_drvdata(serio->parent);
+			psmouse_deactivate(parent);
+		}
+
+		if (!psmouse->protocol->smbus_companion)
+			psmouse_deactivate(psmouse);
+	}
+
+	retval = attr->set(psmouse, attr->data, buf, count);
+
+	if (attr->protect) {
+		if (retval != -ENODEV && !psmouse->protocol->smbus_companion)
+			psmouse_activate(psmouse);
+
+		if (parent)
+			psmouse_activate(parent);
+	}
+
+ out_unlock:
+	mutex_unlock(&psmouse_mutex);
+ out:
+	return retval;
+}
+
+static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
+{
+	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
+
+	return sprintf(buf, "%u\n", *field);
+}
+
+static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
+{
+	unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
+	unsigned int value;
+	int err;
+
+	err = kstrtouint(buf, 10, &value);
+	if (err)
+		return err;
+
+	*field = value;
+
+	return count;
+}
+
+static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
+{
+	return sprintf(buf, "%s\n", psmouse->protocol->name);
+}
+
+static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
+{
+	struct serio *serio = psmouse->ps2dev.serio;
+	struct psmouse *parent = NULL;
+	struct input_dev *old_dev, *new_dev;
+	const struct psmouse_protocol *proto, *old_proto;
+	int error;
+	int retry = 0;
+
+	proto = psmouse_protocol_by_name(buf, count);
+	if (!proto)
+		return -EINVAL;
+
+	if (psmouse->protocol == proto)
+		return count;
+
+	new_dev = input_allocate_device();
+	if (!new_dev)
+		return -ENOMEM;
+
+	while (!list_empty(&serio->children)) {
+		if (++retry > 3) {
+			psmouse_warn(psmouse,
+				     "failed to destroy children ports, protocol change aborted.\n");
+			input_free_device(new_dev);
+			return -EIO;
+		}
+
+		mutex_unlock(&psmouse_mutex);
+		serio_unregister_child_port(serio);
+		mutex_lock(&psmouse_mutex);
+
+		if (serio->drv != &psmouse_drv) {
+			input_free_device(new_dev);
+			return -ENODEV;
+		}
+
+		if (psmouse->protocol == proto) {
+			input_free_device(new_dev);
+			return count; /* switched by other thread */
+		}
+	}
+
+	if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
+		parent = serio_get_drvdata(serio->parent);
+		if (parent->pt_deactivate)
+			parent->pt_deactivate(parent);
+	}
+
+	old_dev = psmouse->dev;
+	old_proto = psmouse->protocol;
+
+	if (psmouse->disconnect)
+		psmouse->disconnect(psmouse);
+
+	psmouse_set_state(psmouse, PSMOUSE_IGNORE);
+
+	psmouse->dev = new_dev;
+	psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
+
+	if (psmouse_switch_protocol(psmouse, proto) < 0) {
+		psmouse_reset(psmouse);
+		/* default to PSMOUSE_PS2 */
+		psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
+	}
+
+	psmouse_initialize(psmouse);
+	psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+
+	if (psmouse->protocol->smbus_companion) {
+		input_free_device(psmouse->dev);
+		psmouse->dev = NULL;
+	} else {
+		error = input_register_device(psmouse->dev);
+		if (error) {
+			if (psmouse->disconnect)
+				psmouse->disconnect(psmouse);
+
+			psmouse_set_state(psmouse, PSMOUSE_IGNORE);
+			input_free_device(new_dev);
+			psmouse->dev = old_dev;
+			psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
+			psmouse_switch_protocol(psmouse, old_proto);
+			psmouse_initialize(psmouse);
+			psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
+
+			return error;
+		}
+	}
+
+	if (old_dev)
+		input_unregister_device(old_dev);
+
+	if (parent && parent->pt_activate)
+		parent->pt_activate(parent);
+
+	return count;
+}
+
+static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
+{
+	unsigned int value;
+	int err;
+
+	err = kstrtouint(buf, 10, &value);
+	if (err)
+		return err;
+
+	psmouse->set_rate(psmouse, value);
+	return count;
+}
+
+static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
+{
+	unsigned int value;
+	int err;
+
+	err = kstrtouint(buf, 10, &value);
+	if (err)
+		return err;
+
+	psmouse->set_resolution(psmouse, value);
+	return count;
+}
+
+
+static int psmouse_set_maxproto(const char *val, const struct kernel_param *kp)
+{
+	const struct psmouse_protocol *proto;
+
+	if (!val)
+		return -EINVAL;
+
+	proto = psmouse_protocol_by_name(val, strlen(val));
+
+	if (!proto || !proto->maxproto)
+		return -EINVAL;
+
+	*((unsigned int *)kp->arg) = proto->type;
+
+	return 0;
+}
+
+static int psmouse_get_maxproto(char *buffer, const struct kernel_param *kp)
+{
+	int type = *((unsigned int *)kp->arg);
+
+	return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
+}
+
+static int __init psmouse_init(void)
+{
+	int err;
+
+	lifebook_module_init();
+	synaptics_module_init();
+	hgpk_module_init();
+
+	err = psmouse_smbus_module_init();
+	if (err)
+		return err;
+
+	kpsmoused_wq = alloc_ordered_workqueue("kpsmoused", 0);
+	if (!kpsmoused_wq) {
+		pr_err("failed to create kpsmoused workqueue\n");
+		err = -ENOMEM;
+		goto err_smbus_exit;
+	}
+
+	err = serio_register_driver(&psmouse_drv);
+	if (err)
+		goto err_destroy_wq;
+
+	return 0;
+
+err_destroy_wq:
+	destroy_workqueue(kpsmoused_wq);
+err_smbus_exit:
+	psmouse_smbus_module_exit();
+	return err;
+}
+
+static void __exit psmouse_exit(void)
+{
+	serio_unregister_driver(&psmouse_drv);
+	destroy_workqueue(kpsmoused_wq);
+	psmouse_smbus_module_exit();
+}
+
+module_init(psmouse_init);
+module_exit(psmouse_exit);