1 files changed, 449 insertions, 0 deletions

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 000000000000..3784ebf80ec7
--- /dev/null
+++ b/drivers/media/rc/ir-mce_kbd-decoder.c
@@ -0,0 +1,449 @@
+/* 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->raw->enabled_protocols & RC_TYPE_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_TYPE_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");