This patch introduces a driver for the PixArt PS/2 touchpad, which
supports both clickpad and touchpad types.
At the same time, we extended the single data packet length to 16,
because according to the current PixArt hardware and FW design, we need
11 bytes/15 bytes to represent the complete three-finger/four-finger data.
Co-developed-by: Jon Xie <jon_xie@xxxxxxxxxx>
Signed-off-by: Jon Xie <jon_xie@xxxxxxxxxx>
Co-developed-by: Jay Lee <jay_lee@xxxxxxxxxx>
Signed-off-by: Jay Lee <jay_lee@xxxxxxxxxx>
Signed-off-by: Binbin Zhou <zhoubinbin@xxxxxxxxxxx>
---
V4:
- Thanks Dmitry for the review.
- Just return what ps2_command() reports, instead of replacing it with
-EIO;
- Refact pixart_read_tp_mode/pixart_read_tp_type(), to separate mode
value and errors/success;
- Pass the INPUT_MT_POINTER flag to input_mt_init_slots() and remove
some redundant code, like the call to input_mt_report_finger_count()
and the setting of bits in the touchpad section.
Link to V3:
https://lore.kernel.org/all/20240701094953.3195501-1-zhoubinbin@xxxxxxxxxxx/
V3:
- Rebased on input/next;
- Added comment to msleep() in pixart_reset() as suggested by Aseda, no
functional change, thanks.
Link to V2:
https://lore.kernel.org/all/20240624065359.2985060-1-zhoubinbin@xxxxxxxxxxx/
V2:
- Rebased on input/next;
- Merge two patches from the V1 patchset;
- Initialize local variables to prevent random garbage;
- Remove some noisy debug message;
- Check ps2_command() return value;
- Use macros to represent bit operations for better readability, such
as abs_x;
- Remove the code related to rel packets, for the normal
intellimouse detection is well in PixArt.
Link to V1:
https://lore.kernel.org/all/cover.1715224143.git.zhoubinbin@xxxxxxxxxxx/
drivers/input/mouse/Kconfig | 12 ++
drivers/input/mouse/Makefile | 1 +
drivers/input/mouse/pixart_ps2.c | 277 +++++++++++++++++++++++++++++
drivers/input/mouse/pixart_ps2.h | 36 ++++
drivers/input/mouse/psmouse-base.c | 17 ++
drivers/input/mouse/psmouse.h | 3 +-
6 files changed, 345 insertions(+), 1 deletion(-)
create mode 100644 drivers/input/mouse/pixart_ps2.c
create mode 100644 drivers/input/mouse/pixart_ps2.h
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 833b643f0616..8a27a20d04b0 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -69,6 +69,18 @@ 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
diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index a1336d5bee6f..563029551529 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -32,6 +32,7 @@ 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
diff --git a/drivers/input/mouse/pixart_ps2.c b/drivers/input/mouse/pixart_ps2.c
new file mode 100644
index 000000000000..6d78c4157abe
--- /dev/null
+++ b/drivers/input/mouse/pixart_ps2.c
@@ -0,0 +1,277 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Pixart Touchpad Controller 1336U PS2 driver
+ *
+ * Author: Jon Xie <jon_xie@xxxxxxxxxx>
+ * Jay Lee <jay_lee@xxxxxxxxxx>
+ * Further cleanup and restructuring by:
+ * Binbin Zhou <zhoubinbin@xxxxxxxxxxx>
+ *
+ * Copyright (C) 2021-2024 Pixart Imaging.
+ * Copyright (C) 2024 Loongson Technology Corporation Limited.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/libps2.h>
+#include <linux/input/mt.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;
+ int i, id, fingers = 0, abs_x, abs_y;
+ u8 *pkt = psmouse->packet;
+ u8 contact_cnt = CONTACT_CNT(pkt[0]);
+ bool tip;
+
+ for (i = 0; i < contact_cnt; i++) {
+ id = SLOT_ID_MASK(pkt[3 * i + 3]);
+ abs_y = ABS_Y_MASK(pkt[3 * i + 3]) | pkt[3 * i + 1];
+ abs_x = ABS_X_MASK(pkt[3 * i + 3]) | pkt[3 * i + 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)) {
+ fingers++;
+ 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] & 0x01);
+ input_report_key(dev, BTN_RIGHT, pkt[0] & 0x02);
+ }
+
+ input_sync(dev);
+}
+
+static psmouse_ret_t pixart_protocol_handler(struct psmouse *psmouse)
+{
+ u8 *pkt = psmouse->packet;
+ u8 contact_cnt = CONTACT_CNT(pkt[0]);
+
+ if (contact_cnt > PIXART_MAX_FINGERS || ((pkt[0] & 0x8c) != 0x80))
+ 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)
+{
+ u8 mode;
+ int error;
+ struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+ pixart_reset(psmouse);
+ error = pixart_read_tp_mode(ps2dev, &mode);
+ if (error)
+ return error;
+
+ if (mode != PIXART_MODE_ABS)
+ return mode;
+
+ return ps2_command(ps2dev, NULL, PIXART_CMD_SWITCH_PROTO);
+}
+
+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_SLOTS_NUM, 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;
+
+ return pixart_read_tp_mode(ps2dev, mode);
+}
+
+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;
+}
diff --git a/drivers/input/mouse/pixart_ps2.h b/drivers/input/mouse/pixart_ps2.h
new file mode 100644
index 000000000000..ecc0f715b291
--- /dev/null
+++ b/drivers/input/mouse/pixart_ps2.h
@@ -0,0 +1,36 @@
+/* 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_SLOTS_NUM PIXART_MAX_FINGERS
+
+#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(m) (((m) & GENMASK(6, 4)) >> 4)
+#define SLOT_ID_MASK(m) ((m) & GENMASK(2, 0))
+#define ABS_Y_MASK(m) (((m) & GENMASK(5, 4)) << 4)
+#define ABS_X_MASK(m) (((m) & GENMASK(7, 6)) << 2)
+
+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 */
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index a0aac76b1e41..41af3460077d 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -36,6 +36,7 @@
#include "focaltech.h"
#include "vmmouse.h"
#include "byd.h"
+#include "pixart_ps2.h"
#define DRIVER_DESC "PS/2 mouse driver"
@@ -905,6 +906,15 @@ 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,
@@ -1172,6 +1182,13 @@ 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))
diff --git a/drivers/input/mouse/psmouse.h b/drivers/input/mouse/psmouse.h
index 4d8acfe0d82a..23f7fa7243cb 100644
--- a/drivers/input/mouse/psmouse.h
+++ b/drivers/input/mouse/psmouse.h
@@ -69,6 +69,7 @@ enum psmouse_type {
PSMOUSE_BYD,
PSMOUSE_SYNAPTICS_SMBUS,
PSMOUSE_ELANTECH_SMBUS,
+ PSMOUSE_PIXART,
PSMOUSE_AUTO /* This one should always be last */
};
@@ -94,7 +95,7 @@ struct psmouse {
const char *vendor;
const char *name;
const struct psmouse_protocol *protocol;
- unsigned char packet[8];
+ unsigned char packet[16];
unsigned char badbyte;
unsigned char pktcnt;
unsigned char pktsize;
--
2.43.0
