linux/drivers/media/rc/ir-mce_kbd-decoder.c
David Härdeman 9719afae5e [media] rc-core: don't treat dev->rc_map.rc_type as a bitmap
store_protocols() treats dev->rc_map.rc_type as a bitmap which is wrong for
two reasons. First of all, it is pretty bogus to change the protocol type of
the keymap just because the hardware has been asked to decode a different
protocol.
Second, dev->rc_map.rc_type is an enum (i.e. a single protocol) as pointed
out by James Hogan <james.hogan@imgtec.com>.
Fix both issues by introducing a separate enabled_protocols member to
struct rc_dev.

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2013-03-23 11:25:54 -03:00

450 lines
13 KiB
C

/* 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 <jarod@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#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 inditinguishable
* 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 333333 /* ns */
#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_RESERVED, 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(unsigned long data)
{
struct mce_kbd_dec *mce_kbd = (struct mce_kbd_dec *)data;
int i;
unsigned char maskcode;
IR_dprintk(2, "timer callback clearing all keys\n");
for (i = 0; i < 7; i++) {
maskcode = kbd_keycodes[MCIR2_MASK_KEYS_START + i];
input_report_key(mce_kbd->idev, maskcode, 0);
}
for (i = 0; i < MCIR2_MASK_KEYS_START; i++)
input_report_key(mce_kbd->idev, kbd_keycodes[i], 0);
}
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 input_dev *idev,
u32 scancode)
{
u8 keydata = (scancode >> 8) & 0xff;
u8 shiftmask = scancode & 0xff;
unsigned char keycode, maskcode;
int i, keystate;
IR_dprintk(1, "keyboard: keydata = 0x%02x, shiftmask = 0x%02x\n",
keydata, 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(idev, maskcode, keystate);
}
if (keydata) {
keycode = kbd_keycodes[keydata];
input_report_key(idev, keycode, 1);
} else {
for (i = 0; i < MCIR2_MASK_KEYS_START; i++)
input_report_key(idev, kbd_keycodes[i], 0);
}
}
static void ir_mce_kbd_process_mouse_data(struct input_dev *idev, 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;
IR_dprintk(1, "mouse: x = %d, y = %d, btns = %s%s\n",
x, y, left ? "L" : "", right ? "R" : "");
input_report_rel(idev, REL_X, x);
input_report_rel(idev, REL_Y, y);
input_report_key(idev, BTN_LEFT, left);
input_report_key(idev, 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;
if (!(dev->enabled_protocols & RC_BIT_MCE_KBD))
return 0;
if (!is_timing_event(ev)) {
if (ev.reset)
data->state = STATE_INACTIVE;
return 0;
}
if (!geq_margin(ev.duration, MCIR2_UNIT, MCIR2_UNIT / 2))
goto out;
again:
IR_dprintk(2, "started at state %i (%uus %s)\n",
data->state, TO_US(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:
if (!is_transition(&ev, &dev->raw->prev_ev))
break;
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:
IR_dprintk(1, "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 (!is_transition(&ev, &dev->raw->prev_ev))
break;
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 & 0xffff;
IR_dprintk(1, "keyboard data 0x%08x\n", data->body);
if (dev->timeout)
delay = usecs_to_jiffies(dev->timeout / 1000);
else
delay = msecs_to_jiffies(100);
mod_timer(&data->rx_timeout, jiffies + delay);
/* Pass data to keyboard buffer parser */
ir_mce_kbd_process_keyboard_data(data->idev, scancode);
break;
case MCIR2_MOUSE_NBITS:
scancode = data->body & 0x1fffff;
IR_dprintk(1, "mouse data 0x%06x\n", scancode);
/* Pass data to mouse buffer parser */
ir_mce_kbd_process_mouse_data(data->idev, scancode);
break;
default:
IR_dprintk(1, "not keyboard or mouse data\n");
goto out;
}
data->state = STATE_INACTIVE;
input_sync(data->idev);
return 0;
}
out:
IR_dprintk(1, "failed at state %i (%uus %s)\n",
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
input_sync(data->idev);
return -EINVAL;
}
static int ir_mce_kbd_register(struct rc_dev *dev)
{
struct mce_kbd_dec *mce_kbd = &dev->raw->mce_kbd;
struct input_dev *idev;
int i, ret;
idev = input_allocate_device();
if (!idev)
return -ENOMEM;
snprintf(mce_kbd->name, sizeof(mce_kbd->name),
"MCE IR Keyboard/Mouse (%s)", dev->driver_name);
strlcat(mce_kbd->phys, "/input0", sizeof(mce_kbd->phys));
idev->name = mce_kbd->name;
idev->phys = mce_kbd->phys;
/* Keyboard bits */
set_bit(EV_KEY, idev->evbit);
set_bit(EV_REP, idev->evbit);
for (i = 0; i < sizeof(kbd_keycodes); i++)
set_bit(kbd_keycodes[i], idev->keybit);
/* Mouse bits */
set_bit(EV_REL, idev->evbit);
set_bit(REL_X, idev->relbit);
set_bit(REL_Y, idev->relbit);
set_bit(BTN_LEFT, idev->keybit);
set_bit(BTN_RIGHT, idev->keybit);
/* Report scancodes too */
set_bit(EV_MSC, idev->evbit);
set_bit(MSC_SCAN, idev->mscbit);
setup_timer(&mce_kbd->rx_timeout, mce_kbd_rx_timeout,
(unsigned long)mce_kbd);
input_set_drvdata(idev, mce_kbd);
#if 0
/* Adding this reference means two input devices are associated with
* this rc-core device, which ir-keytable doesn't cope with yet */
idev->dev.parent = &dev->dev;
#endif
ret = input_register_device(idev);
if (ret < 0) {
input_free_device(idev);
return -EIO;
}
mce_kbd->idev = idev;
return 0;
}
static int ir_mce_kbd_unregister(struct rc_dev *dev)
{
struct mce_kbd_dec *mce_kbd = &dev->raw->mce_kbd;
struct input_dev *idev = mce_kbd->idev;
del_timer_sync(&mce_kbd->rx_timeout);
input_unregister_device(idev);
return 0;
}
static struct ir_raw_handler mce_kbd_handler = {
.protocols = RC_BIT_MCE_KBD,
.decode = ir_mce_kbd_decode,
.raw_register = ir_mce_kbd_register,
.raw_unregister = ir_mce_kbd_unregister,
};
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 <jarod@redhat.com>");
MODULE_DESCRIPTION("MCE Keyboard/mouse IR protocol decoder");