From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/media/rc/ir-mce_kbd-decoder.c | 451 ++++++++++++++++++++++++++++++++++ 1 file changed, 451 insertions(+) create mode 100644 drivers/media/rc/ir-mce_kbd-decoder.c (limited to 'drivers/media/rc/ir-mce_kbd-decoder.c') diff --git a/drivers/media/rc/ir-mce_kbd-decoder.c b/drivers/media/rc/ir-mce_kbd-decoder.c new file mode 100644 index 0000000000..66e8feb9a5 --- /dev/null +++ b/drivers/media/rc/ir-mce_kbd-decoder.c @@ -0,0 +1,451 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* ir-mce_kbd-decoder.c - A decoder for the RC6-ish keyboard/mouse IR protocol + * used by the Microsoft Remote Keyboard for Windows Media Center Edition, + * referred to by Microsoft's Windows Media Center remote specification docs + * as "an internal protocol called MCIR-2". + * + * Copyright (C) 2011 by Jarod Wilson + */ +#include + +#include "rc-core-priv.h" + +/* + * This decoder currently supports: + * - MCIR-2 29-bit IR signals used for mouse movement and buttons + * - MCIR-2 32-bit IR signals used for standard keyboard keys + * + * The media keys on the keyboard send RC-6 signals that are indistinguishable + * from the keys of the same name on the stock MCE remote, and will be handled + * by the standard RC-6 decoder, and be made available to the system via the + * input device for the remote, rather than the keyboard/mouse one. + */ + +#define MCIR2_UNIT 333 /* us */ +#define MCIR2_HEADER_NBITS 5 +#define MCIR2_MOUSE_NBITS 29 +#define MCIR2_KEYBOARD_NBITS 32 +#define MCIR2_PREFIX_PULSE (8 * MCIR2_UNIT) +#define MCIR2_PREFIX_SPACE (1 * MCIR2_UNIT) +#define MCIR2_MAX_LEN (3 * MCIR2_UNIT) +#define MCIR2_BIT_START (1 * MCIR2_UNIT) +#define MCIR2_BIT_END (1 * MCIR2_UNIT) +#define MCIR2_BIT_0 (1 * MCIR2_UNIT) +#define MCIR2_BIT_SET (2 * MCIR2_UNIT) +#define MCIR2_MODE_MASK 0xf /* for the header bits */ +#define MCIR2_KEYBOARD_HEADER 0x4 +#define MCIR2_MOUSE_HEADER 0x1 +#define MCIR2_MASK_KEYS_START 0xe0 + +enum mce_kbd_mode { + MCIR2_MODE_KEYBOARD, + MCIR2_MODE_MOUSE, + MCIR2_MODE_UNKNOWN, +}; + +enum mce_kbd_state { + STATE_INACTIVE, + STATE_HEADER_BIT_START, + STATE_HEADER_BIT_END, + STATE_BODY_BIT_START, + STATE_BODY_BIT_END, + STATE_FINISHED, +}; + +static unsigned char kbd_keycodes[256] = { + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_A, + KEY_B, KEY_C, KEY_D, KEY_E, KEY_F, + KEY_G, KEY_H, KEY_I, KEY_J, KEY_K, + KEY_L, KEY_M, KEY_N, KEY_O, KEY_P, + KEY_Q, KEY_R, KEY_S, KEY_T, KEY_U, + KEY_V, KEY_W, KEY_X, KEY_Y, KEY_Z, + KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, + KEY_6, KEY_7, KEY_8, KEY_9, KEY_0, + KEY_ENTER, KEY_ESC, KEY_BACKSPACE, KEY_TAB, KEY_SPACE, + KEY_MINUS, KEY_EQUAL, KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, + KEY_BACKSLASH, KEY_SEMICOLON, KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA, + KEY_DOT, KEY_SLASH, KEY_CAPSLOCK, KEY_F1, KEY_F2, + KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7, + KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, + KEY_SYSRQ, KEY_SCROLLLOCK, KEY_PAUSE, KEY_INSERT, KEY_HOME, + KEY_PAGEUP, KEY_DELETE, KEY_END, KEY_PAGEDOWN, KEY_RIGHT, + KEY_LEFT, KEY_DOWN, KEY_UP, KEY_NUMLOCK, KEY_KPSLASH, + KEY_KPASTERISK, KEY_KPMINUS, KEY_KPPLUS, KEY_KPENTER, KEY_KP1, + KEY_KP2, KEY_KP3, KEY_KP4, KEY_KP5, KEY_KP6, + KEY_KP7, KEY_KP8, KEY_KP9, KEY_KP0, KEY_KPDOT, + KEY_102ND, KEY_COMPOSE, KEY_POWER, KEY_KPEQUAL, KEY_F13, + KEY_F14, KEY_F15, KEY_F16, KEY_F17, KEY_F18, + KEY_F19, KEY_F20, KEY_F21, KEY_F22, KEY_F23, + KEY_F24, KEY_OPEN, KEY_HELP, KEY_PROPS, KEY_FRONT, + KEY_STOP, KEY_AGAIN, KEY_UNDO, KEY_CUT, KEY_COPY, + KEY_PASTE, KEY_FIND, KEY_MUTE, KEY_VOLUMEUP, KEY_VOLUMEDOWN, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_KPCOMMA, KEY_RESERVED, + KEY_RO, KEY_KATAKANAHIRAGANA, KEY_YEN, KEY_HENKAN, KEY_MUHENKAN, + KEY_KPJPCOMMA, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_HANGUEL, + KEY_HANJA, KEY_KATAKANA, KEY_HIRAGANA, KEY_ZENKAKUHANKAKU, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_LEFTCTRL, + KEY_LEFTSHIFT, KEY_LEFTALT, KEY_LEFTMETA, KEY_RIGHTCTRL, KEY_RIGHTSHIFT, + KEY_RIGHTALT, KEY_RIGHTMETA, KEY_PLAYPAUSE, KEY_STOPCD, KEY_PREVIOUSSONG, + KEY_NEXTSONG, KEY_EJECTCD, KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_MUTE, + KEY_WWW, KEY_BACK, KEY_FORWARD, KEY_STOP, KEY_FIND, + KEY_SCROLLUP, KEY_SCROLLDOWN, KEY_EDIT, KEY_SLEEP, KEY_COFFEE, + KEY_REFRESH, KEY_CALC, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, + KEY_RESERVED +}; + +static void mce_kbd_rx_timeout(struct timer_list *t) +{ + struct ir_raw_event_ctrl *raw = from_timer(raw, t, mce_kbd.rx_timeout); + unsigned char maskcode; + unsigned long flags; + int i; + + dev_dbg(&raw->dev->dev, "timer callback clearing all keys\n"); + + spin_lock_irqsave(&raw->mce_kbd.keylock, flags); + + if (time_is_before_eq_jiffies(raw->mce_kbd.rx_timeout.expires)) { + for (i = 0; i < 7; i++) { + maskcode = kbd_keycodes[MCIR2_MASK_KEYS_START + i]; + input_report_key(raw->dev->input_dev, maskcode, 0); + } + + for (i = 0; i < MCIR2_MASK_KEYS_START; i++) + input_report_key(raw->dev->input_dev, kbd_keycodes[i], + 0); + + input_sync(raw->dev->input_dev); + } + spin_unlock_irqrestore(&raw->mce_kbd.keylock, flags); +} + +static enum mce_kbd_mode mce_kbd_mode(struct mce_kbd_dec *data) +{ + switch (data->header & MCIR2_MODE_MASK) { + case MCIR2_KEYBOARD_HEADER: + return MCIR2_MODE_KEYBOARD; + case MCIR2_MOUSE_HEADER: + return MCIR2_MODE_MOUSE; + default: + return MCIR2_MODE_UNKNOWN; + } +} + +static void ir_mce_kbd_process_keyboard_data(struct rc_dev *dev, u32 scancode) +{ + u8 keydata1 = (scancode >> 8) & 0xff; + u8 keydata2 = (scancode >> 16) & 0xff; + u8 shiftmask = scancode & 0xff; + unsigned char maskcode; + int i, keystate; + + dev_dbg(&dev->dev, "keyboard: keydata2 = 0x%02x, keydata1 = 0x%02x, shiftmask = 0x%02x\n", + keydata2, keydata1, shiftmask); + + for (i = 0; i < 7; i++) { + maskcode = kbd_keycodes[MCIR2_MASK_KEYS_START + i]; + if (shiftmask & (1 << i)) + keystate = 1; + else + keystate = 0; + input_report_key(dev->input_dev, maskcode, keystate); + } + + if (keydata1) + input_report_key(dev->input_dev, kbd_keycodes[keydata1], 1); + if (keydata2) + input_report_key(dev->input_dev, kbd_keycodes[keydata2], 1); + + if (!keydata1 && !keydata2) { + for (i = 0; i < MCIR2_MASK_KEYS_START; i++) + input_report_key(dev->input_dev, kbd_keycodes[i], 0); + } +} + +static void ir_mce_kbd_process_mouse_data(struct rc_dev *dev, u32 scancode) +{ + /* raw mouse coordinates */ + u8 xdata = (scancode >> 7) & 0x7f; + u8 ydata = (scancode >> 14) & 0x7f; + int x, y; + /* mouse buttons */ + bool right = scancode & 0x40; + bool left = scancode & 0x20; + + if (xdata & 0x40) + x = -((~xdata & 0x7f) + 1); + else + x = xdata; + + if (ydata & 0x40) + y = -((~ydata & 0x7f) + 1); + else + y = ydata; + + dev_dbg(&dev->dev, "mouse: x = %d, y = %d, btns = %s%s\n", + x, y, left ? "L" : "", right ? "R" : ""); + + input_report_rel(dev->input_dev, REL_X, x); + input_report_rel(dev->input_dev, REL_Y, y); + + input_report_key(dev->input_dev, BTN_LEFT, left); + input_report_key(dev->input_dev, BTN_RIGHT, right); +} + +/** + * ir_mce_kbd_decode() - Decode one mce_kbd pulse or space + * @dev: the struct rc_dev descriptor of the device + * @ev: the struct ir_raw_event descriptor of the pulse/space + * + * This function returns -EINVAL if the pulse violates the state machine + */ +static int ir_mce_kbd_decode(struct rc_dev *dev, struct ir_raw_event ev) +{ + struct mce_kbd_dec *data = &dev->raw->mce_kbd; + u32 scancode; + unsigned long delay; + struct lirc_scancode lsc = {}; + + if (!is_timing_event(ev)) { + if (ev.overflow) + data->state = STATE_INACTIVE; + return 0; + } + + if (!geq_margin(ev.duration, MCIR2_UNIT, MCIR2_UNIT / 2)) + goto out; + +again: + dev_dbg(&dev->dev, "started at state %i (%uus %s)\n", + data->state, ev.duration, TO_STR(ev.pulse)); + + if (!geq_margin(ev.duration, MCIR2_UNIT, MCIR2_UNIT / 2)) + return 0; + + switch (data->state) { + + case STATE_INACTIVE: + if (!ev.pulse) + break; + + /* Note: larger margin on first pulse since each MCIR2_UNIT + is quite short and some hardware takes some time to + adjust to the signal */ + if (!eq_margin(ev.duration, MCIR2_PREFIX_PULSE, MCIR2_UNIT)) + break; + + data->state = STATE_HEADER_BIT_START; + data->count = 0; + data->header = 0; + return 0; + + case STATE_HEADER_BIT_START: + if (geq_margin(ev.duration, MCIR2_MAX_LEN, MCIR2_UNIT / 2)) + break; + + data->header <<= 1; + if (ev.pulse) + data->header |= 1; + data->count++; + data->state = STATE_HEADER_BIT_END; + return 0; + + case STATE_HEADER_BIT_END: + decrease_duration(&ev, MCIR2_BIT_END); + + if (data->count != MCIR2_HEADER_NBITS) { + data->state = STATE_HEADER_BIT_START; + goto again; + } + + switch (mce_kbd_mode(data)) { + case MCIR2_MODE_KEYBOARD: + data->wanted_bits = MCIR2_KEYBOARD_NBITS; + break; + case MCIR2_MODE_MOUSE: + data->wanted_bits = MCIR2_MOUSE_NBITS; + break; + default: + dev_dbg(&dev->dev, "not keyboard or mouse data\n"); + goto out; + } + + data->count = 0; + data->body = 0; + data->state = STATE_BODY_BIT_START; + goto again; + + case STATE_BODY_BIT_START: + if (geq_margin(ev.duration, MCIR2_MAX_LEN, MCIR2_UNIT / 2)) + break; + + data->body <<= 1; + if (ev.pulse) + data->body |= 1; + data->count++; + data->state = STATE_BODY_BIT_END; + return 0; + + case STATE_BODY_BIT_END: + if (data->count == data->wanted_bits) + data->state = STATE_FINISHED; + else + data->state = STATE_BODY_BIT_START; + + decrease_duration(&ev, MCIR2_BIT_END); + goto again; + + case STATE_FINISHED: + if (ev.pulse) + break; + + switch (data->wanted_bits) { + case MCIR2_KEYBOARD_NBITS: + scancode = data->body & 0xffffff; + dev_dbg(&dev->dev, "keyboard data 0x%08x\n", + data->body); + spin_lock(&data->keylock); + if (scancode) { + delay = usecs_to_jiffies(dev->timeout) + + msecs_to_jiffies(100); + mod_timer(&data->rx_timeout, jiffies + delay); + } else { + del_timer(&data->rx_timeout); + } + /* Pass data to keyboard buffer parser */ + ir_mce_kbd_process_keyboard_data(dev, scancode); + spin_unlock(&data->keylock); + lsc.rc_proto = RC_PROTO_MCIR2_KBD; + break; + case MCIR2_MOUSE_NBITS: + scancode = data->body & 0x1fffff; + dev_dbg(&dev->dev, "mouse data 0x%06x\n", scancode); + /* Pass data to mouse buffer parser */ + ir_mce_kbd_process_mouse_data(dev, scancode); + lsc.rc_proto = RC_PROTO_MCIR2_MSE; + break; + default: + dev_dbg(&dev->dev, "not keyboard or mouse data\n"); + goto out; + } + + lsc.scancode = scancode; + lirc_scancode_event(dev, &lsc); + data->state = STATE_INACTIVE; + input_event(dev->input_dev, EV_MSC, MSC_SCAN, scancode); + input_sync(dev->input_dev); + return 0; + } + +out: + dev_dbg(&dev->dev, "failed at state %i (%uus %s)\n", + data->state, ev.duration, TO_STR(ev.pulse)); + data->state = STATE_INACTIVE; + return -EINVAL; +} + +static int ir_mce_kbd_register(struct rc_dev *dev) +{ + struct mce_kbd_dec *mce_kbd = &dev->raw->mce_kbd; + + timer_setup(&mce_kbd->rx_timeout, mce_kbd_rx_timeout, 0); + spin_lock_init(&mce_kbd->keylock); + + return 0; +} + +static int ir_mce_kbd_unregister(struct rc_dev *dev) +{ + struct mce_kbd_dec *mce_kbd = &dev->raw->mce_kbd; + + del_timer_sync(&mce_kbd->rx_timeout); + + return 0; +} + +static const struct ir_raw_timings_manchester ir_mce_kbd_timings = { + .leader_pulse = MCIR2_PREFIX_PULSE, + .invert = 1, + .clock = MCIR2_UNIT, + .trailer_space = MCIR2_UNIT * 10, +}; + +/** + * ir_mce_kbd_encode() - Encode a scancode as a stream of raw events + * + * @protocol: protocol to encode + * @scancode: scancode to encode + * @events: array of raw ir events to write into + * @max: maximum size of @events + * + * Returns: The number of events written. + * -ENOBUFS if there isn't enough space in the array to fit the + * encoding. In this case all @max events will have been written. + */ +static int ir_mce_kbd_encode(enum rc_proto protocol, u32 scancode, + struct ir_raw_event *events, unsigned int max) +{ + struct ir_raw_event *e = events; + int len, ret; + u64 raw; + + if (protocol == RC_PROTO_MCIR2_KBD) { + raw = scancode | + ((u64)MCIR2_KEYBOARD_HEADER << MCIR2_KEYBOARD_NBITS); + len = MCIR2_KEYBOARD_NBITS + MCIR2_HEADER_NBITS; + } else { + raw = scancode | + ((u64)MCIR2_MOUSE_HEADER << MCIR2_MOUSE_NBITS); + len = MCIR2_MOUSE_NBITS + MCIR2_HEADER_NBITS; + } + + ret = ir_raw_gen_manchester(&e, max, &ir_mce_kbd_timings, len, raw); + if (ret < 0) + return ret; + + return e - events; +} + +static struct ir_raw_handler mce_kbd_handler = { + .protocols = RC_PROTO_BIT_MCIR2_KBD | RC_PROTO_BIT_MCIR2_MSE, + .decode = ir_mce_kbd_decode, + .encode = ir_mce_kbd_encode, + .raw_register = ir_mce_kbd_register, + .raw_unregister = ir_mce_kbd_unregister, + .carrier = 36000, + .min_timeout = MCIR2_MAX_LEN + MCIR2_UNIT / 2, +}; + +static int __init ir_mce_kbd_decode_init(void) +{ + ir_raw_handler_register(&mce_kbd_handler); + + printk(KERN_INFO "IR MCE Keyboard/mouse protocol handler initialized\n"); + return 0; +} + +static void __exit ir_mce_kbd_decode_exit(void) +{ + ir_raw_handler_unregister(&mce_kbd_handler); +} + +module_init(ir_mce_kbd_decode_init); +module_exit(ir_mce_kbd_decode_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jarod Wilson "); +MODULE_DESCRIPTION("MCE Keyboard/mouse IR protocol decoder"); -- cgit v1.2.3