/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * ALPS touchpad PS/2 mouse driver
 *
 * Copyright (c) 2003 Peter Osterlund <petero2@telia.com>
 * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
 */

#ifndef _ALPS_H
#define _ALPS_H

#include <linux/input/mt.h>

#define ALPS_PROTO_V1           0x100
#define ALPS_PROTO_V2           0x200
#define ALPS_PROTO_V3           0x300
#define ALPS_PROTO_V3_RUSHMORE  0x310
#define ALPS_PROTO_V4           0x400
#define ALPS_PROTO_V5           0x500
#define ALPS_PROTO_V6           0x600
#define ALPS_PROTO_V7           0x700   /* t3btl t4s */
#define ALPS_PROTO_V8           0x800   /* SS4btl SS4s */
#define ALPS_PROTO_V9           0x900   /* ss3btl */

#define MAX_TOUCHES     4

#define DOLPHIN_COUNT_PER_ELECTRODE     64
#define DOLPHIN_PROFILE_XOFFSET         8       /* x-electrode offset */
#define DOLPHIN_PROFILE_YOFFSET         1       /* y-electrode offset */

/*
 * enum SS4_PACKET_ID - defines the packet type for V8
 * SS4_PACKET_ID_IDLE: There's no finger and no button activity.
 * SS4_PACKET_ID_ONE: There's one finger on touchpad
 *  or there's button activities.
 * SS4_PACKET_ID_TWO: There's two or more fingers on touchpad
 * SS4_PACKET_ID_MULTI: There's three or more fingers on touchpad
 * SS4_PACKET_ID_STICK: A stick pointer packet
*/
enum SS4_PACKET_ID {
        SS4_PACKET_ID_IDLE = 0,
        SS4_PACKET_ID_ONE,
        SS4_PACKET_ID_TWO,
        SS4_PACKET_ID_MULTI,
        SS4_PACKET_ID_STICK,
};

#define SS4_COUNT_PER_ELECTRODE         256
#define SS4_NUMSENSOR_XOFFSET           7
#define SS4_NUMSENSOR_YOFFSET           7
#define SS4_MIN_PITCH_MM                50

#define SS4_MASK_NORMAL_BUTTONS         0x07

#define SS4PLUS_COUNT_PER_ELECTRODE     128
#define SS4PLUS_NUMSENSOR_XOFFSET       16
#define SS4PLUS_NUMSENSOR_YOFFSET       5
#define SS4PLUS_MIN_PITCH_MM            37

#define IS_SS4PLUS_DEV(_b)      (((_b[0]) == 0x73) &&   \
                                 ((_b[1]) == 0x03) &&   \
                                 ((_b[2]) == 0x28)              \
                                )

#define SS4_IS_IDLE_V2(_b)      (((_b[0]) == 0x18) &&           \
                                 ((_b[1]) == 0x10) &&           \
                                 ((_b[2]) == 0x00) &&           \
                                 ((_b[3] & 0x88) == 0x08) &&    \
                                 ((_b[4]) == 0x10) &&           \
                                 ((_b[5]) == 0x00)              \
                                )

#define SS4_1F_X_V2(_b)         (((_b[0]) & 0x0007) |           \
                                 ((_b[1] << 3) & 0x0078) |      \
                                 ((_b[1] << 2) & 0x0380) |      \
                                 ((_b[2] << 5) & 0x1C00)        \
                                )

#define SS4_1F_Y_V2(_b)         (((_b[2]) & 0x000F) |           \
                                 ((_b[3] >> 2) & 0x0030) |      \
                                 ((_b[4] << 6) & 0x03C0) |      \
                                 ((_b[4] << 5) & 0x0C00)        \
                                )

#define SS4_1F_Z_V2(_b)         (((_b[5]) & 0x0F) |             \
                                 ((_b[5] >> 1) & 0x70) |        \
                                 ((_b[4]) & 0x80)               \
                                )

#define SS4_1F_LFB_V2(_b)       (((_b[2] >> 4) & 0x01) == 0x01)

#define SS4_MF_LF_V2(_b, _i)    ((_b[1 + (_i) * 3] & 0x0004) == 0x0004)

#define SS4_BTN_V2(_b)          ((_b[0] >> 5) & SS4_MASK_NORMAL_BUTTONS)

#define SS4_STD_MF_X_V2(_b, _i) (((_b[0 + (_i) * 3] << 5) & 0x00E0) |   \
                                 ((_b[1 + _i * 3]  << 5) & 0x1F00)      \
                                )

#define SS4_PLUS_STD_MF_X_V2(_b, _i) (((_b[0 + (_i) * 3] << 4) & 0x0070) | \
                                 ((_b[1 + (_i) * 3]  << 4) & 0x0F80)    \
                                )

#define SS4_STD_MF_Y_V2(_b, _i) (((_b[1 + (_i) * 3] << 3) & 0x0010) |   \
                                 ((_b[2 + (_i) * 3] << 5) & 0x01E0) |   \
                                 ((_b[2 + (_i) * 3] << 4) & 0x0E00)     \
                                )

#define SS4_BTL_MF_X_V2(_b, _i) (SS4_STD_MF_X_V2(_b, _i) |              \
                                 ((_b[0 + (_i) * 3] >> 3) & 0x0010)     \
                                )

#define SS4_PLUS_BTL_MF_X_V2(_b, _i) (SS4_PLUS_STD_MF_X_V2(_b, _i) |    \
                                 ((_b[0 + (_i) * 3] >> 4) & 0x0008)     \
                                )

#define SS4_BTL_MF_Y_V2(_b, _i) (SS4_STD_MF_Y_V2(_b, _i) | \
                                 ((_b[0 + (_i) * 3] >> 3) & 0x0008)     \
                                )

#define SS4_MF_Z_V2(_b, _i)     (((_b[1 + (_i) * 3]) & 0x0001) |        \
                                 ((_b[1 + (_i) * 3] >> 1) & 0x0002)     \
                                )

#define SS4_IS_MF_CONTINUE(_b)  ((_b[2] & 0x10) == 0x10)
#define SS4_IS_5F_DETECTED(_b)  ((_b[2] & 0x10) == 0x10)

#define SS4_TS_X_V2(_b)         (s8)(                           \
                                 ((_b[0] & 0x01) << 7) |        \
                                 (_b[1] & 0x7F)         \
                                )

#define SS4_TS_Y_V2(_b)         -(s8)(                          \
                                 ((_b[3] & 0x01) << 7) |        \
                                 (_b[2] & 0x7F)         \
                                )

#define SS4_TS_Z_V2(_b)         (s8)(_b[4] & 0x7F)


#define SS4_MFPACKET_NO_AX              8160    /* X-Coordinate value */
#define SS4_MFPACKET_NO_AY              4080    /* Y-Coordinate value */
#define SS4_MFPACKET_NO_AX_BL           8176    /* Buttonless X-Coord value */
#define SS4_MFPACKET_NO_AY_BL           4088    /* Buttonless Y-Coord value */
#define SS4_PLUS_MFPACKET_NO_AX         4080    /* SS4 PLUS, X */
#define SS4_PLUS_MFPACKET_NO_AX_BL      4088    /* Buttonless SS4 PLUS, X */

/*
 * enum V7_PACKET_ID - defines the packet type for V7
 * V7_PACKET_ID_IDLE: There's no finger and no button activity.
 * V7_PACKET_ID_TWO: There's one or two non-resting fingers on touchpad
 *  or there's button activities.
 * V7_PACKET_ID_MULTI: There are at least three non-resting fingers.
 * V7_PACKET_ID_NEW: The finger position in slot is not continues from
 *  previous packet.
*/
enum V7_PACKET_ID {
         V7_PACKET_ID_IDLE,
         V7_PACKET_ID_TWO,
         V7_PACKET_ID_MULTI,
         V7_PACKET_ID_NEW,
         V7_PACKET_ID_UNKNOWN,
};

/**
 * struct alps_protocol_info - information about protocol used by a device
 * @version: Indicates V1/V2/V3/...
 * @byte0: Helps figure out whether a position report packet matches the
 *   known format for this model.  The first byte of the report, ANDed with
 *   mask0, should match byte0.
 * @mask0: The mask used to check the first byte of the report.
 * @flags: Additional device capabilities (passthrough port, trackstick, etc.).
 */
struct alps_protocol_info {
        u16 version;
        u8 byte0, mask0;
        unsigned int flags;
};

/**
 * struct alps_model_info - touchpad ID table
 * @signature: E7 response string to match.
 * @protocol_info: information about protocol used by the device.
 *
 * Many (but not all) ALPS touchpads can be identified by looking at the
 * values returned in the "E7 report" and/or the "EC report."  This table
 * lists a number of such touchpads.
 */
struct alps_model_info {
        u8 signature[3];
        struct alps_protocol_info protocol_info;
};

/**
 * struct alps_nibble_commands - encodings for register accesses
 * @command: PS/2 command used for the nibble
 * @data: Data supplied as an argument to the PS/2 command, if applicable
 *
 * The ALPS protocol uses magic sequences to transmit binary data to the
 * touchpad, as it is generally not OK to send arbitrary bytes out the
 * PS/2 port.  Each of the sequences in this table sends one nibble of the
 * register address or (write) data.  Different versions of the ALPS protocol
 * use slightly different encodings.
 */
struct alps_nibble_commands {
        int command;
        unsigned char data;
};

struct alps_bitmap_point {
        int start_bit;
        int num_bits;
};

/**
 * struct alps_fields - decoded version of the report packet
 * @x_map: Bitmap of active X positions for MT.
 * @y_map: Bitmap of active Y positions for MT.
 * @fingers: Number of fingers for MT.
 * @pressure: Pressure.
 * @st: position for ST.
 * @mt: position for MT.
 * @first_mp: Packet is the first of a multi-packet report.
 * @is_mp: Packet is part of a multi-packet report.
 * @left: Left touchpad button is active.
 * @right: Right touchpad button is active.
 * @middle: Middle touchpad button is active.
 * @ts_left: Left trackstick button is active.
 * @ts_right: Right trackstick button is active.
 * @ts_middle: Middle trackstick button is active.
 */
struct alps_fields {
        unsigned int x_map;
        unsigned int y_map;
        unsigned int fingers;

        int pressure;
        struct input_mt_pos st;
        struct input_mt_pos mt[MAX_TOUCHES];

        unsigned int first_mp:1;
        unsigned int is_mp:1;

        unsigned int left:1;
        unsigned int right:1;
        unsigned int middle:1;

        unsigned int ts_left:1;
        unsigned int ts_right:1;
        unsigned int ts_middle:1;
};

/**
 * struct alps_data - private data structure for the ALPS driver
 * @psmouse: Pointer to parent psmouse device
 * @dev2: Trackstick device (can be NULL).
 * @dev3: Generic PS/2 mouse (can be NULL, delayed registering).
 * @phys2: Physical path for the trackstick device.
 * @phys3: Physical path for the generic PS/2 mouse.
 * @dev3_register_work: Delayed work for registering PS/2 mouse.
 * @nibble_commands: Command mapping used for touchpad register accesses.
 * @addr_command: Command used to tell the touchpad that a register address
 *   follows.
 * @proto_version: Indicates V1/V2/V3/...
 * @byte0: Helps figure out whether a position report packet matches the
 *   known format for this model.  The first byte of the report, ANDed with
 *   mask0, should match byte0.
 * @mask0: The mask used to check the first byte of the report.
 * @fw_ver: cached copy of firmware version (EC report)
 * @flags: Additional device capabilities (passthrough port, trackstick, etc.).
 * @x_max: Largest possible X position value.
 * @y_max: Largest possible Y position value.
 * @x_bits: Number of X bits in the MT bitmap.
 * @y_bits: Number of Y bits in the MT bitmap.
 * @hw_init: Protocol-specific hardware init function.
 * @process_packet: Protocol-specific function to process a report packet.
 * @decode_fields: Protocol-specific function to read packet bitfields.
 * @set_abs_params: Protocol-specific function to configure the input_dev.
 * @prev_fin: Finger bit from previous packet.
 * @multi_packet: Multi-packet data in progress.
 * @multi_data: Saved multi-packet data.
 * @f: Decoded packet data fields.
 * @quirks: Bitmap of ALPS_QUIRK_*.
 * @timer: Timer for flushing out the final report packet in the stream.
 */
struct alps_data {
        struct psmouse *psmouse;
        struct input_dev *dev2;
        struct input_dev *dev3;
        char phys2[32];
        char phys3[32];
        struct delayed_work dev3_register_work;

        /* these are autodetected when the device is identified */
        const struct alps_nibble_commands *nibble_commands;
        int addr_command;
        u16 proto_version;
        u8 byte0, mask0;
        u8 dev_id[3];
        u8 fw_ver[3];
        int flags;
        int x_max;
        int y_max;
        int x_bits;
        int y_bits;
        unsigned int x_res;
        unsigned int y_res;

        int (*hw_init)(struct psmouse *psmouse);
        void (*process_packet)(struct psmouse *psmouse);
        int (*decode_fields)(struct alps_fields *f, unsigned char *p,
                              struct psmouse *psmouse);
        void (*set_abs_params)(struct alps_data *priv, struct input_dev *dev1);

        int prev_fin;
        int multi_packet;
        int second_touch;
        unsigned char multi_data[6];
        struct alps_fields f;
        u8 quirks;
        struct timer_list timer;
};

#define ALPS_QUIRK_TRACKSTICK_BUTTONS   1 /* trakcstick buttons in trackstick packet */

int alps_detect(struct psmouse *psmouse, bool set_properties);
int alps_init(struct psmouse *psmouse);

#endif