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// 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;
}
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