Revert "Input: Add driver for PixArt PS/2 touchpad"

This reverts commit 740ff03d because
current PixArt detection is too greedy and claims devices that are
not PixArt.
Reported-by: Benjamin Tissoires <bentiss@kernel.org>
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2314756Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/mouse/Kconfig

@@ -69,18 +69,6 @@ config MOUSE_PS2_LOGIPS2PP
 
 	  If unsure, say Y.
 
-config MOUSE_PS2_PIXART
-	bool "PixArt PS/2 touchpad protocol extension" if EXPERT
-	default y
-	depends on MOUSE_PS2
-	help
-	  This driver supports the PixArt PS/2 touchpad found in some
-	  laptops.
-	  Say Y here if you have a PixArt PS/2 TouchPad connected to
-	  your system.
-
-	  If unsure, say Y.
-
 config MOUSE_PS2_SYNAPTICS
 	bool "Synaptics PS/2 mouse protocol extension" if EXPERT
 	default y

drivers/input/mouse/Makefile

@@ -32,7 +32,6 @@ psmouse-$(CONFIG_MOUSE_PS2_ELANTECH)	+= elantech.o
 psmouse-$(CONFIG_MOUSE_PS2_OLPC)	+= hgpk.o
 psmouse-$(CONFIG_MOUSE_PS2_LOGIPS2PP)	+= logips2pp.o
 psmouse-$(CONFIG_MOUSE_PS2_LIFEBOOK)	+= lifebook.o
-psmouse-$(CONFIG_MOUSE_PS2_PIXART)	+= pixart_ps2.o
 psmouse-$(CONFIG_MOUSE_PS2_SENTELIC)	+= sentelic.o
 psmouse-$(CONFIG_MOUSE_PS2_TRACKPOINT)	+= trackpoint.o
 psmouse-$(CONFIG_MOUSE_PS2_TOUCHKIT)	+= touchkit_ps2.o

drivers/input/mouse/pixart_ps2.c

-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Pixart Touchpad Controller 1336U PS2 driver
- *
- * Author: Jon Xie <jon_xie@pixart.com>
- *         Jay Lee <jay_lee@pixart.com>
- * Further cleanup and restructuring by:
- *         Binbin Zhou <zhoubinbin@loongson.cn>
- *
- * Copyright (C) 2021-2024 Pixart Imaging.
- * Copyright (C) 2024 Loongson Technology Corporation Limited.
- *
- */
-
-#include <linux/bitfield.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/input.h>
-#include <linux/input/mt.h>
-#include <linux/libps2.h>
-#include <linux/serio.h>
-#include <linux/slab.h>
-
-#include "pixart_ps2.h"
-
-static int pixart_read_tp_mode(struct ps2dev *ps2dev, u8 *mode)
-{
-	int error;
-	u8 param[1] = { 0 };
-
-	error = ps2_command(ps2dev, param, PIXART_CMD_REPORT_FORMAT);
-	if (error)
-		return error;
-
-	*mode = param[0] == 1 ? PIXART_MODE_ABS : PIXART_MODE_REL;
-
-	return 0;
-}
-
-static int pixart_read_tp_type(struct ps2dev *ps2dev, u8 *type)
-{
-	int error;
-	u8 param[3] = { 0 };
-
-	param[0] = 0x0a;
-	error = ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
-	if (error)
-		return error;
-
-	param[0] = 0x0;
-	error = ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
-	if (error)
-		return error;
-
-	error = ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
-	if (error)
-		return error;
-
-	error = ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
-	if (error)
-		return error;
-
-	param[0] = 0x03;
-	error = ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
-	if (error)
-		return error;
-
-	error = ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
-	if (error)
-		return error;
-
-	*type = param[0] == 0x0e ? PIXART_TYPE_TOUCHPAD : PIXART_TYPE_CLICKPAD;
-
-	return 0;
-}
-
-static void pixart_reset(struct psmouse *psmouse)
-{
-	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
-
-	/* according to PixArt, 100ms is required for the upcoming reset */
-	msleep(100);
-	psmouse_reset(psmouse);
-}
-
-static void pixart_process_packet(struct psmouse *psmouse)
-{
-	struct pixart_data *priv = psmouse->private;
-	struct input_dev *dev = psmouse->dev;
-	const u8 *pkt = psmouse->packet;
-	unsigned int contact_cnt = FIELD_GET(CONTACT_CNT_MASK, pkt[0]);
-	unsigned int i, id, abs_x, abs_y;
-	bool tip;
-
-	for (i = 0; i < contact_cnt; i++) {
-		const u8 *p = &pkt[i * 3];
-
-		id = FIELD_GET(SLOT_ID_MASK, p[3]);
-		abs_y = FIELD_GET(ABS_Y_MASK, p[3]) << 8 | p[1];
-		abs_x = FIELD_GET(ABS_X_MASK, p[3]) << 8 | p[2];
-
-		if (i == PIXART_MAX_FINGERS - 1)
-			tip = pkt[14] & BIT(1);
-		else
-			tip = pkt[3 * contact_cnt + 1] & BIT(2 * i + 1);
-
-		input_mt_slot(dev, id);
-		if (input_mt_report_slot_state(dev, MT_TOOL_FINGER, tip)) {
-			input_report_abs(dev, ABS_MT_POSITION_Y, abs_y);
-			input_report_abs(dev, ABS_MT_POSITION_X, abs_x);
-		}
-	}
-
-	input_mt_sync_frame(dev);
-
-	if (priv->type == PIXART_TYPE_CLICKPAD) {
-		input_report_key(dev, BTN_LEFT, pkt[0] & 0x03);
-	} else {
-		input_report_key(dev, BTN_LEFT, pkt[0] & BIT(0));
-		input_report_key(dev, BTN_RIGHT, pkt[0] & BIT(1));
-	}
-
-	input_sync(dev);
-}
-
-static psmouse_ret_t pixart_protocol_handler(struct psmouse *psmouse)
-{
-	u8 *pkt = psmouse->packet;
-	u8 contact_cnt;
-
-	if ((pkt[0] & 0x8c) != 0x80)
-		return PSMOUSE_BAD_DATA;
-
-	contact_cnt = FIELD_GET(CONTACT_CNT_MASK, pkt[0]);
-	if (contact_cnt > PIXART_MAX_FINGERS)
-		return PSMOUSE_BAD_DATA;
-
-	if (contact_cnt == PIXART_MAX_FINGERS &&
-	    psmouse->pktcnt < psmouse->pktsize) {
-		return PSMOUSE_GOOD_DATA;
-	}
-
-	if (contact_cnt == 0 && psmouse->pktcnt < 5)
-		return PSMOUSE_GOOD_DATA;
-
-	if (psmouse->pktcnt < 3 * contact_cnt + 2)
-		return PSMOUSE_GOOD_DATA;
-
-	pixart_process_packet(psmouse);
-
-	return PSMOUSE_FULL_PACKET;
-}
-
-static void pixart_disconnect(struct psmouse *psmouse)
-{
-	pixart_reset(psmouse);
-	kfree(psmouse->private);
-	psmouse->private = NULL;
-}
-
-static int pixart_reconnect(struct psmouse *psmouse)
-{
-	struct ps2dev *ps2dev = &psmouse->ps2dev;
-	u8 mode;
-	int error;
-
-	pixart_reset(psmouse);
-
-	error = pixart_read_tp_mode(ps2dev, &mode);
-	if (error)
-		return error;
-
-	if (mode != PIXART_MODE_ABS)
-		return -EIO;
-
-	error = ps2_command(ps2dev, NULL, PIXART_CMD_SWITCH_PROTO);
-	if (error)
-		return error;
-
-	return 0;
-}
-
-static int pixart_set_input_params(struct input_dev *dev,
-				   struct pixart_data *priv)
-{
-	/* No relative support */
-	__clear_bit(EV_REL, dev->evbit);
-	__clear_bit(REL_X, dev->relbit);
-	__clear_bit(REL_Y, dev->relbit);
-	__clear_bit(BTN_MIDDLE, dev->keybit);
-
-	/* Buttons */
-	__set_bit(EV_KEY, dev->evbit);
-	__set_bit(BTN_LEFT, dev->keybit);
-	if (priv->type == PIXART_TYPE_CLICKPAD)
-		__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
-	else
-		__set_bit(BTN_RIGHT, dev->keybit);
-
-	/* Absolute position */
-	input_set_abs_params(dev, ABS_X, 0, PIXART_PAD_WIDTH, 0, 0);
-	input_set_abs_params(dev, ABS_Y, 0, PIXART_PAD_HEIGHT, 0, 0);
-
-	input_set_abs_params(dev, ABS_MT_POSITION_X,
-			     0, PIXART_PAD_WIDTH, 0, 0);
-	input_set_abs_params(dev, ABS_MT_POSITION_Y,
-			     0, PIXART_PAD_HEIGHT, 0, 0);
-
-	return input_mt_init_slots(dev, PIXART_MAX_FINGERS, INPUT_MT_POINTER);
-}
-
-static int pixart_query_hardware(struct ps2dev *ps2dev, u8 *mode, u8 *type)
-{
-	int error;
-
-	error = pixart_read_tp_type(ps2dev, type);
-	if (error)
-		return error;
-
-	error = pixart_read_tp_mode(ps2dev, mode);
-	if (error)
-		return error;
-
-	return 0;
-}
-
-int pixart_detect(struct psmouse *psmouse, bool set_properties)
-{
-	u8 type;
-	int error;
-
-	pixart_reset(psmouse);
-
-	error = pixart_read_tp_type(&psmouse->ps2dev, &type);
-	if (error)
-		return error;
-
-	if (set_properties) {
-		psmouse->vendor = "PixArt";
-		psmouse->name = (type == PIXART_TYPE_TOUCHPAD) ?
-				"touchpad" : "clickpad";
-	}
-
-	return 0;
-}
-
-int pixart_init(struct psmouse *psmouse)
-{
-	int error;
-	struct pixart_data *priv;
-
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	psmouse->private = priv;
-	pixart_reset(psmouse);
-
-	error = pixart_query_hardware(&psmouse->ps2dev,
-				      &priv->mode, &priv->type);
-	if (error) {
-		psmouse_err(psmouse, "init: Unable to query PixArt touchpad hardware.\n");
-		goto err_exit;
-	}
-
-	/* Relative mode follows standard PS/2 mouse protocol */
-	if (priv->mode != PIXART_MODE_ABS) {
-		error = -EIO;
-		goto err_exit;
-	}
-
-	/* Set absolute mode */
-	error = ps2_command(&psmouse->ps2dev, NULL, PIXART_CMD_SWITCH_PROTO);
-	if (error) {
-		psmouse_err(psmouse, "init: Unable to initialize PixArt absolute mode.\n");
-		goto err_exit;
-	}
-
-	error = pixart_set_input_params(psmouse->dev, priv);
-	if (error) {
-		psmouse_err(psmouse, "init: Unable to set input params.\n");
-		goto err_exit;
-	}
-
-	psmouse->pktsize = 15;
-	psmouse->protocol_handler = pixart_protocol_handler;
-	psmouse->disconnect = pixart_disconnect;
-	psmouse->reconnect = pixart_reconnect;
-	psmouse->cleanup = pixart_reset;
-	/* resync is not supported yet */
-	psmouse->resync_time = 0;
-
-	return 0;
-
-err_exit:
-	pixart_reset(psmouse);
-	kfree(priv);
-	psmouse->private = NULL;
-	return error;
-}

drivers/input/mouse/pixart_ps2.h

-/* SPDX-License-Identifier: GPL-2.0-or-later */
-#ifndef _PIXART_PS2_H
-#define _PIXART_PS2_H
-
-#include "psmouse.h"
-
-#define PIXART_PAD_WIDTH		1023
-#define PIXART_PAD_HEIGHT		579
-#define PIXART_MAX_FINGERS		4
-
-#define PIXART_CMD_REPORT_FORMAT	0x01d8
-#define PIXART_CMD_SWITCH_PROTO		0x00de
-
-#define PIXART_MODE_REL			0
-#define PIXART_MODE_ABS			1
-
-#define PIXART_TYPE_CLICKPAD		0
-#define PIXART_TYPE_TOUCHPAD		1
-
-#define CONTACT_CNT_MASK		GENMASK(6, 4)
-
-#define SLOT_ID_MASK			GENMASK(2, 0)
-#define ABS_Y_MASK			GENMASK(5, 4)
-#define ABS_X_MASK			GENMASK(7, 6)
-
-struct pixart_data {
-	u8 mode;
-	u8 type;
-	int x_max;
-	int y_max;
-};
-
-int pixart_detect(struct psmouse *psmouse, bool set_properties);
-int pixart_init(struct psmouse *psmouse);
-
-#endif  /* _PIXART_PS2_H */

drivers/input/mouse/psmouse-base.c

@@ -36,7 +36,6 @@
 #include "focaltech.h"
 #include "vmmouse.h"
 #include "byd.h"
-#include "pixart_ps2.h"
 
 #define DRIVER_DESC	"PS/2 mouse driver"
 
@@ -906,15 +905,6 @@ static const struct psmouse_protocol psmouse_protocols[] = {
 		.detect		= byd_detect,
 		.init		= byd_init,
 	},
-#endif
-#ifdef CONFIG_MOUSE_PS2_PIXART
-	{
-		.type		= PSMOUSE_PIXART,
-		.name		= "PixArtPS/2",
-		.alias		= "pixart",
-		.detect		= pixart_detect,
-		.init		= pixart_init,
-	},
 #endif
 	{
 		.type		= PSMOUSE_AUTO,
@@ -1182,13 +1172,6 @@ static int psmouse_extensions(struct psmouse *psmouse,
 			return ret;
 	}
 
-	/* Try PixArt touchpad */
-	if (max_proto > PSMOUSE_IMEX &&
-	    psmouse_try_protocol(psmouse, PSMOUSE_PIXART, &max_proto,
-				 set_properties, true)) {
-		return PSMOUSE_PIXART;
-	}
-
 	if (max_proto > PSMOUSE_IMEX) {
 		if (psmouse_try_protocol(psmouse, PSMOUSE_GENPS,
 					 &max_proto, set_properties, true))

drivers/input/mouse/psmouse.h

@@ -69,7 +69,6 @@ enum psmouse_type {
 	PSMOUSE_BYD,
 	PSMOUSE_SYNAPTICS_SMBUS,
 	PSMOUSE_ELANTECH_SMBUS,
-	PSMOUSE_PIXART,
 	PSMOUSE_AUTO		/* This one should always be last */
 };
 
@@ -95,7 +94,7 @@ struct psmouse {
 	const char *vendor;
 	const char *name;
 	const struct psmouse_protocol *protocol;
-	unsigned char packet[16];
+	unsigned char packet[8];
 	unsigned char badbyte;
 	unsigned char pktcnt;
 	unsigned char pktsize;