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-rw-r--r--drivers/input/mouse/byd.c510
1 files changed, 510 insertions, 0 deletions
diff --git a/drivers/input/mouse/byd.c b/drivers/input/mouse/byd.c
new file mode 100644
index 000000000..6e0c5f5a2
--- /dev/null
+++ b/drivers/input/mouse/byd.c
@@ -0,0 +1,510 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * BYD TouchPad PS/2 mouse driver
+ *
+ * Copyright (C) 2015 Chris Diamand <chris@diamand.org>
+ * Copyright (C) 2015 Richard Pospesel
+ * Copyright (C) 2015 Tai Chi Minh Ralph Eastwood
+ * Copyright (C) 2015 Martin Wimpress
+ * Copyright (C) 2015 Jay Kuri
+ */
+
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/libps2.h>
+#include <linux/serio.h>
+#include <linux/slab.h>
+
+#include "psmouse.h"
+#include "byd.h"
+
+/* PS2 Bits */
+#define PS2_Y_OVERFLOW BIT_MASK(7)
+#define PS2_X_OVERFLOW BIT_MASK(6)
+#define PS2_Y_SIGN BIT_MASK(5)
+#define PS2_X_SIGN BIT_MASK(4)
+#define PS2_ALWAYS_1 BIT_MASK(3)
+#define PS2_MIDDLE BIT_MASK(2)
+#define PS2_RIGHT BIT_MASK(1)
+#define PS2_LEFT BIT_MASK(0)
+
+/*
+ * BYD pad constants
+ */
+
+/*
+ * True device resolution is unknown, however experiments show the
+ * resolution is about 111 units/mm.
+ * Absolute coordinate packets are in the range 0-255 for both X and Y
+ * we pick ABS_X/ABS_Y dimensions which are multiples of 256 and in
+ * the right ballpark given the touchpad's physical dimensions and estimate
+ * resolution per spec sheet, device active area dimensions are
+ * 101.6 x 60.1 mm.
+ */
+#define BYD_PAD_WIDTH 11264
+#define BYD_PAD_HEIGHT 6656
+#define BYD_PAD_RESOLUTION 111
+
+/*
+ * Given the above dimensions, relative packets velocity is in multiples of
+ * 1 unit / 11 milliseconds. We use this dt to estimate distance traveled
+ */
+#define BYD_DT 11
+/* Time in jiffies used to timeout various touch events (64 ms) */
+#define BYD_TOUCH_TIMEOUT msecs_to_jiffies(64)
+
+/* BYD commands reverse engineered from windows driver */
+
+/*
+ * Swipe gesture from off-pad to on-pad
+ * 0 : disable
+ * 1 : enable
+ */
+#define BYD_CMD_SET_OFFSCREEN_SWIPE 0x10cc
+/*
+ * Tap and drag delay time
+ * 0 : disable
+ * 1 - 8 : least to most delay
+ */
+#define BYD_CMD_SET_TAP_DRAG_DELAY_TIME 0x10cf
+/*
+ * Physical buttons function mapping
+ * 0 : enable
+ * 4 : normal
+ * 5 : left button custom command
+ * 6 : right button custom command
+ * 8 : disable
+ */
+#define BYD_CMD_SET_PHYSICAL_BUTTONS 0x10d0
+/*
+ * Absolute mode (1 byte X/Y resolution)
+ * 0 : disable
+ * 2 : enable
+ */
+#define BYD_CMD_SET_ABSOLUTE_MODE 0x10d1
+/*
+ * Two finger scrolling
+ * 1 : vertical
+ * 2 : horizontal
+ * 3 : vertical + horizontal
+ * 4 : disable
+ */
+#define BYD_CMD_SET_TWO_FINGER_SCROLL 0x10d2
+/*
+ * Handedness
+ * 1 : right handed
+ * 2 : left handed
+ */
+#define BYD_CMD_SET_HANDEDNESS 0x10d3
+/*
+ * Tap to click
+ * 1 : enable
+ * 2 : disable
+ */
+#define BYD_CMD_SET_TAP 0x10d4
+/*
+ * Tap and drag
+ * 1 : tap and hold to drag
+ * 2 : tap and hold to drag + lock
+ * 3 : disable
+ */
+#define BYD_CMD_SET_TAP_DRAG 0x10d5
+/*
+ * Touch sensitivity
+ * 1 - 7 : least to most sensitive
+ */
+#define BYD_CMD_SET_TOUCH_SENSITIVITY 0x10d6
+/*
+ * One finger scrolling
+ * 1 : vertical
+ * 2 : horizontal
+ * 3 : vertical + horizontal
+ * 4 : disable
+ */
+#define BYD_CMD_SET_ONE_FINGER_SCROLL 0x10d7
+/*
+ * One finger scrolling function
+ * 1 : free scrolling
+ * 2 : edge motion
+ * 3 : free scrolling + edge motion
+ * 4 : disable
+ */
+#define BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC 0x10d8
+/*
+ * Sliding speed
+ * 1 - 5 : slowest to fastest
+ */
+#define BYD_CMD_SET_SLIDING_SPEED 0x10da
+/*
+ * Edge motion
+ * 1 : disable
+ * 2 : enable when dragging
+ * 3 : enable when dragging and pointing
+ */
+#define BYD_CMD_SET_EDGE_MOTION 0x10db
+/*
+ * Left edge region size
+ * 0 - 7 : smallest to largest width
+ */
+#define BYD_CMD_SET_LEFT_EDGE_REGION 0x10dc
+/*
+ * Top edge region size
+ * 0 - 9 : smallest to largest height
+ */
+#define BYD_CMD_SET_TOP_EDGE_REGION 0x10dd
+/*
+ * Disregard palm press as clicks
+ * 1 - 6 : smallest to largest
+ */
+#define BYD_CMD_SET_PALM_CHECK 0x10de
+/*
+ * Right edge region size
+ * 0 - 7 : smallest to largest width
+ */
+#define BYD_CMD_SET_RIGHT_EDGE_REGION 0x10df
+/*
+ * Bottom edge region size
+ * 0 - 9 : smallest to largest height
+ */
+#define BYD_CMD_SET_BOTTOM_EDGE_REGION 0x10e1
+/*
+ * Multitouch gestures
+ * 1 : enable
+ * 2 : disable
+ */
+#define BYD_CMD_SET_MULTITOUCH 0x10e3
+/*
+ * Edge motion speed
+ * 0 : control with finger pressure
+ * 1 - 9 : slowest to fastest
+ */
+#define BYD_CMD_SET_EDGE_MOTION_SPEED 0x10e4
+/*
+ * Two finger scolling function
+ * 0 : free scrolling
+ * 1 : free scrolling (with momentum)
+ * 2 : edge motion
+ * 3 : free scrolling (with momentum) + edge motion
+ * 4 : disable
+ */
+#define BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC 0x10e5
+
+/*
+ * The touchpad generates a mixture of absolute and relative packets, indicated
+ * by the the last byte of each packet being set to one of the following:
+ */
+#define BYD_PACKET_ABSOLUTE 0xf8
+#define BYD_PACKET_RELATIVE 0x00
+/* Multitouch gesture packets */
+#define BYD_PACKET_PINCH_IN 0xd8
+#define BYD_PACKET_PINCH_OUT 0x28
+#define BYD_PACKET_ROTATE_CLOCKWISE 0x29
+#define BYD_PACKET_ROTATE_ANTICLOCKWISE 0xd7
+#define BYD_PACKET_TWO_FINGER_SCROLL_RIGHT 0x2a
+#define BYD_PACKET_TWO_FINGER_SCROLL_DOWN 0x2b
+#define BYD_PACKET_TWO_FINGER_SCROLL_UP 0xd5
+#define BYD_PACKET_TWO_FINGER_SCROLL_LEFT 0xd6
+#define BYD_PACKET_THREE_FINGER_SWIPE_RIGHT 0x2c
+#define BYD_PACKET_THREE_FINGER_SWIPE_DOWN 0x2d
+#define BYD_PACKET_THREE_FINGER_SWIPE_UP 0xd3
+#define BYD_PACKET_THREE_FINGER_SWIPE_LEFT 0xd4
+#define BYD_PACKET_FOUR_FINGER_DOWN 0x33
+#define BYD_PACKET_FOUR_FINGER_UP 0xcd
+#define BYD_PACKET_REGION_SCROLL_RIGHT 0x35
+#define BYD_PACKET_REGION_SCROLL_DOWN 0x36
+#define BYD_PACKET_REGION_SCROLL_UP 0xca
+#define BYD_PACKET_REGION_SCROLL_LEFT 0xcb
+#define BYD_PACKET_RIGHT_CORNER_CLICK 0xd2
+#define BYD_PACKET_LEFT_CORNER_CLICK 0x2e
+#define BYD_PACKET_LEFT_AND_RIGHT_CORNER_CLICK 0x2f
+#define BYD_PACKET_ONTO_PAD_SWIPE_RIGHT 0x37
+#define BYD_PACKET_ONTO_PAD_SWIPE_DOWN 0x30
+#define BYD_PACKET_ONTO_PAD_SWIPE_UP 0xd0
+#define BYD_PACKET_ONTO_PAD_SWIPE_LEFT 0xc9
+
+struct byd_data {
+ struct timer_list timer;
+ struct psmouse *psmouse;
+ s32 abs_x;
+ s32 abs_y;
+ typeof(jiffies) last_touch_time;
+ bool btn_left;
+ bool btn_right;
+ bool touch;
+};
+
+static void byd_report_input(struct psmouse *psmouse)
+{
+ struct byd_data *priv = psmouse->private;
+ struct input_dev *dev = psmouse->dev;
+
+ input_report_key(dev, BTN_TOUCH, priv->touch);
+ input_report_key(dev, BTN_TOOL_FINGER, priv->touch);
+
+ input_report_abs(dev, ABS_X, priv->abs_x);
+ input_report_abs(dev, ABS_Y, priv->abs_y);
+ input_report_key(dev, BTN_LEFT, priv->btn_left);
+ input_report_key(dev, BTN_RIGHT, priv->btn_right);
+
+ input_sync(dev);
+}
+
+static void byd_clear_touch(struct timer_list *t)
+{
+ struct byd_data *priv = from_timer(priv, t, timer);
+ struct psmouse *psmouse = priv->psmouse;
+
+ serio_pause_rx(psmouse->ps2dev.serio);
+ priv->touch = false;
+
+ byd_report_input(psmouse);
+
+ serio_continue_rx(psmouse->ps2dev.serio);
+
+ /*
+ * Move cursor back to center of pad when we lose touch - this
+ * specifically improves user experience when moving cursor with one
+ * finger, and pressing a button with another.
+ */
+ priv->abs_x = BYD_PAD_WIDTH / 2;
+ priv->abs_y = BYD_PAD_HEIGHT / 2;
+}
+
+static psmouse_ret_t byd_process_byte(struct psmouse *psmouse)
+{
+ struct byd_data *priv = psmouse->private;
+ u8 *pkt = psmouse->packet;
+
+ if (psmouse->pktcnt > 0 && !(pkt[0] & PS2_ALWAYS_1)) {
+ psmouse_warn(psmouse, "Always_1 bit not 1. pkt[0] = %02x\n",
+ pkt[0]);
+ return PSMOUSE_BAD_DATA;
+ }
+
+ if (psmouse->pktcnt < psmouse->pktsize)
+ return PSMOUSE_GOOD_DATA;
+
+ /* Otherwise, a full packet has been received */
+ switch (pkt[3]) {
+ case BYD_PACKET_ABSOLUTE:
+ /* Only use absolute packets for the start of movement. */
+ if (!priv->touch) {
+ /* needed to detect tap */
+ typeof(jiffies) tap_time =
+ priv->last_touch_time + BYD_TOUCH_TIMEOUT;
+ priv->touch = time_after(jiffies, tap_time);
+
+ /* init abs position */
+ priv->abs_x = pkt[1] * (BYD_PAD_WIDTH / 256);
+ priv->abs_y = (255 - pkt[2]) * (BYD_PAD_HEIGHT / 256);
+ }
+ break;
+ case BYD_PACKET_RELATIVE: {
+ /* Standard packet */
+ /* Sign-extend if a sign bit is set. */
+ u32 signx = pkt[0] & PS2_X_SIGN ? ~0xFF : 0;
+ u32 signy = pkt[0] & PS2_Y_SIGN ? ~0xFF : 0;
+ s32 dx = signx | (int) pkt[1];
+ s32 dy = signy | (int) pkt[2];
+
+ /* Update position based on velocity */
+ priv->abs_x += dx * BYD_DT;
+ priv->abs_y -= dy * BYD_DT;
+
+ priv->touch = true;
+ break;
+ }
+ default:
+ psmouse_warn(psmouse,
+ "Unrecognized Z: pkt = %02x %02x %02x %02x\n",
+ psmouse->packet[0], psmouse->packet[1],
+ psmouse->packet[2], psmouse->packet[3]);
+ return PSMOUSE_BAD_DATA;
+ }
+
+ priv->btn_left = pkt[0] & PS2_LEFT;
+ priv->btn_right = pkt[0] & PS2_RIGHT;
+
+ byd_report_input(psmouse);
+
+ /* Reset time since last touch. */
+ if (priv->touch) {
+ priv->last_touch_time = jiffies;
+ mod_timer(&priv->timer, jiffies + BYD_TOUCH_TIMEOUT);
+ }
+
+ return PSMOUSE_FULL_PACKET;
+}
+
+static int byd_reset_touchpad(struct psmouse *psmouse)
+{
+ struct ps2dev *ps2dev = &psmouse->ps2dev;
+ u8 param[4];
+ size_t i;
+
+ static const struct {
+ u16 command;
+ u8 arg;
+ } seq[] = {
+ /*
+ * Intellimouse initialization sequence, to get 4-byte instead
+ * of 3-byte packets.
+ */
+ { PSMOUSE_CMD_SETRATE, 0xC8 },
+ { PSMOUSE_CMD_SETRATE, 0x64 },
+ { PSMOUSE_CMD_SETRATE, 0x50 },
+ { PSMOUSE_CMD_GETID, 0 },
+ { PSMOUSE_CMD_ENABLE, 0 },
+ /*
+ * BYD-specific initialization, which enables absolute mode and
+ * (if desired), the touchpad's built-in gesture detection.
+ */
+ { 0x10E2, 0x00 },
+ { 0x10E0, 0x02 },
+ /* The touchpad should reply with 4 seemingly-random bytes */
+ { 0x14E0, 0x01 },
+ /* Pairs of parameters and values. */
+ { BYD_CMD_SET_HANDEDNESS, 0x01 },
+ { BYD_CMD_SET_PHYSICAL_BUTTONS, 0x04 },
+ { BYD_CMD_SET_TAP, 0x02 },
+ { BYD_CMD_SET_ONE_FINGER_SCROLL, 0x04 },
+ { BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC, 0x04 },
+ { BYD_CMD_SET_EDGE_MOTION, 0x01 },
+ { BYD_CMD_SET_PALM_CHECK, 0x00 },
+ { BYD_CMD_SET_MULTITOUCH, 0x02 },
+ { BYD_CMD_SET_TWO_FINGER_SCROLL, 0x04 },
+ { BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC, 0x04 },
+ { BYD_CMD_SET_LEFT_EDGE_REGION, 0x00 },
+ { BYD_CMD_SET_TOP_EDGE_REGION, 0x00 },
+ { BYD_CMD_SET_RIGHT_EDGE_REGION, 0x00 },
+ { BYD_CMD_SET_BOTTOM_EDGE_REGION, 0x00 },
+ { BYD_CMD_SET_ABSOLUTE_MODE, 0x02 },
+ /* Finalize initialization. */
+ { 0x10E0, 0x00 },
+ { 0x10E2, 0x01 },
+ };
+
+ for (i = 0; i < ARRAY_SIZE(seq); ++i) {
+ memset(param, 0, sizeof(param));
+ param[0] = seq[i].arg;
+ if (ps2_command(ps2dev, param, seq[i].command))
+ return -EIO;
+ }
+
+ psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
+ return 0;
+}
+
+static int byd_reconnect(struct psmouse *psmouse)
+{
+ int retry = 0, error = 0;
+
+ psmouse_dbg(psmouse, "Reconnect\n");
+ do {
+ psmouse_reset(psmouse);
+ if (retry)
+ ssleep(1);
+ error = byd_detect(psmouse, 0);
+ } while (error && ++retry < 3);
+
+ if (error)
+ return error;
+
+ psmouse_dbg(psmouse, "Reconnected after %d attempts\n", retry);
+
+ error = byd_reset_touchpad(psmouse);
+ if (error) {
+ psmouse_err(psmouse, "Unable to initialize device\n");
+ return error;
+ }
+
+ return 0;
+}
+
+static void byd_disconnect(struct psmouse *psmouse)
+{
+ struct byd_data *priv = psmouse->private;
+
+ if (priv) {
+ del_timer(&priv->timer);
+ kfree(psmouse->private);
+ psmouse->private = NULL;
+ }
+}
+
+int byd_detect(struct psmouse *psmouse, bool set_properties)
+{
+ struct ps2dev *ps2dev = &psmouse->ps2dev;
+ u8 param[4] = {0x03, 0x00, 0x00, 0x00};
+
+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
+ return -1;
+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
+ return -1;
+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
+ return -1;
+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
+ return -1;
+ if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
+ return -1;
+
+ if (param[1] != 0x03 || param[2] != 0x64)
+ return -ENODEV;
+
+ psmouse_dbg(psmouse, "BYD touchpad detected\n");
+
+ if (set_properties) {
+ psmouse->vendor = "BYD";
+ psmouse->name = "TouchPad";
+ }
+
+ return 0;
+}
+
+int byd_init(struct psmouse *psmouse)
+{
+ struct input_dev *dev = psmouse->dev;
+ struct byd_data *priv;
+
+ if (psmouse_reset(psmouse))
+ return -EIO;
+
+ if (byd_reset_touchpad(psmouse))
+ return -EIO;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->psmouse = psmouse;
+ timer_setup(&priv->timer, byd_clear_touch, 0);
+
+ psmouse->private = priv;
+ psmouse->disconnect = byd_disconnect;
+ psmouse->reconnect = byd_reconnect;
+ psmouse->protocol_handler = byd_process_byte;
+ psmouse->pktsize = 4;
+ psmouse->resync_time = 0;
+
+ __set_bit(INPUT_PROP_POINTER, dev->propbit);
+ /* Touchpad */
+ __set_bit(BTN_TOUCH, dev->keybit);
+ __set_bit(BTN_TOOL_FINGER, dev->keybit);
+ /* Buttons */
+ __set_bit(BTN_LEFT, dev->keybit);
+ __set_bit(BTN_RIGHT, dev->keybit);
+ __clear_bit(BTN_MIDDLE, dev->keybit);
+
+ /* Absolute position */
+ __set_bit(EV_ABS, dev->evbit);
+ input_set_abs_params(dev, ABS_X, 0, BYD_PAD_WIDTH, 0, 0);
+ input_set_abs_params(dev, ABS_Y, 0, BYD_PAD_HEIGHT, 0, 0);
+ input_abs_set_res(dev, ABS_X, BYD_PAD_RESOLUTION);
+ input_abs_set_res(dev, ABS_Y, BYD_PAD_RESOLUTION);
+ /* No relative support */
+ __clear_bit(EV_REL, dev->evbit);
+ __clear_bit(REL_X, dev->relbit);
+ __clear_bit(REL_Y, dev->relbit);
+
+ return 0;
+}
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