| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | #ifndef _LIBPS2_H |
| 3 | #define _LIBPS2_H |
| 4 | |
| 5 | /* |
| 6 | * Copyright (C) 1999-2002 Vojtech Pavlik |
| 7 | * Copyright (C) 2004 Dmitry Torokhov |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/bitops.h> |
| 11 | #include <linux/mutex.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/wait.h> |
| 14 | |
| 15 | #define PS2_CMD_SETSCALE11 0x00e6 |
| 16 | #define PS2_CMD_SETRES 0x10e8 |
| 17 | #define PS2_CMD_GETID 0x02f2 |
| 18 | #define PS2_CMD_RESET_BAT 0x02ff |
| 19 | |
| 20 | #define PS2_RET_BAT 0xaa |
| 21 | #define PS2_RET_ID 0x00 |
| 22 | #define PS2_RET_ACK 0xfa |
| 23 | #define PS2_RET_NAK 0xfe |
| 24 | #define PS2_RET_ERR 0xfc |
| 25 | |
| 26 | #define PS2_FLAG_ACK BIT(0) /* Waiting for ACK/NAK */ |
| 27 | #define PS2_FLAG_CMD BIT(1) /* Waiting for a command to finish */ |
| 28 | #define PS2_FLAG_CMD1 BIT(2) /* Waiting for the first byte of command response */ |
| 29 | #define PS2_FLAG_WAITID BIT(3) /* Command executing is GET ID */ |
| 30 | #define PS2_FLAG_NAK BIT(4) /* Last transmission was NAKed */ |
| 31 | #define PS2_FLAG_ACK_CMD BIT(5) /* Waiting to ACK the command (first) byte */ |
| 32 | |
| 33 | struct ps2dev { |
| 34 | struct serio *serio; |
| 35 | |
| 36 | /* Ensures that only one command is executing at a time */ |
| 37 | struct mutex cmd_mutex; |
| 38 | |
| 39 | /* Used to signal completion from interrupt handler */ |
| 40 | wait_queue_head_t wait; |
| 41 | |
| 42 | unsigned long flags; |
| 43 | u8 cmdbuf[8]; |
| 44 | u8 cmdcnt; |
| 45 | u8 nak; |
| 46 | }; |
| 47 | |
| 48 | void ps2_init(struct ps2dev *ps2dev, struct serio *serio); |
| 49 | int ps2_sendbyte(struct ps2dev *ps2dev, u8 byte, unsigned int timeout); |
| 50 | void ps2_drain(struct ps2dev *ps2dev, size_t maxbytes, unsigned int timeout); |
| 51 | void ps2_begin_command(struct ps2dev *ps2dev); |
| 52 | void ps2_end_command(struct ps2dev *ps2dev); |
| 53 | int __ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command); |
| 54 | int ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command); |
| 55 | int ps2_sliced_command(struct ps2dev *ps2dev, u8 command); |
| 56 | bool ps2_handle_ack(struct ps2dev *ps2dev, u8 data); |
| 57 | bool ps2_handle_response(struct ps2dev *ps2dev, u8 data); |
| 58 | void ps2_cmd_aborted(struct ps2dev *ps2dev); |
| 59 | bool ps2_is_keyboard_id(u8 id); |
| 60 | |
| 61 | #endif /* _LIBPS2_H */ |