path: root/drivers/input/keyboard/tegra-kbc.c

/*
 * Keyboard class input driver for the NVIDIA Tegra SoC internal matrix
 * keyboard controller
 *
 * Copyright (c) 2009-2011, NVIDIA Corporation.
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <mach/clk.h>
#include <mach/kbc.h>

#define KBC_MAX_DEBOUNCE_CNT	0x3ffu

/* KBC row scan time and delay for beginning the row scan. */
#define KBC_ROW_SCAN_TIME	16
#define KBC_ROW_SCAN_DLY	5

/* KBC uses a 32KHz clock so a cycle = 1/32Khz */
#define KBC_CYCLE_MS	32

/* KBC Registers */

/* KBC Control Register */
#define KBC_CONTROL_0	0x0
#define KBC_FIFO_TH_CNT_SHIFT(cnt)	(cnt << 14)
#define KBC_DEBOUNCE_CNT_SHIFT(cnt)	(cnt << 4)
#define KBC_CONTROL_FIFO_CNT_INT_EN	(1 << 3)
#define KBC_CONTROL_KEYPRESS_INT_EN	(1 << 1)
#define KBC_CONTROL_KBC_EN		(1 << 0)

/* KBC Interrupt Register */
#define KBC_INT_0	0x4
#define KBC_INT_FIFO_CNT_INT_STATUS	(1 << 2)
#define KBC_INT_KEYPRESS_INT_STATUS	(1 << 0)

#define KBC_ROW_CFG0_0	0x8
#define KBC_COL_CFG0_0	0x18
#define KBC_TO_CNT_0	0x24
#define KBC_INIT_DLY_0	0x28
#define KBC_RPT_DLY_0	0x2c
#define KBC_KP_ENT0_0	0x30
#define KBC_KP_ENT1_0	0x34
#define KBC_ROW0_MASK_0	0x38

#define KBC_ROW_SHIFT	3

struct tegra_kbc {
	void __iomem *mmio;
	struct input_dev *idev;
	unsigned int irq;
	spinlock_t lock;
	unsigned int repoll_dly;
	unsigned long cp_dly_jiffies;
	unsigned int cp_to_wkup_dly;
	bool use_fn_map;
	bool use_ghost_filter;
	bool keypress_caused_wake;
	const struct tegra_kbc_platform_data *pdata;
	unsigned short keycode[KBC_MAX_KEY * 2];
	unsigned short current_keys[KBC_MAX_KPENT];
	unsigned int num_pressed_keys;
	u32 wakeup_key;
	struct timer_list timer;
	struct clk *clk;
};

static const u32 tegra_kbc_default_keymap[] __devinitdata = {
	KEY(0, 2, KEY_W),
	KEY(0, 3, KEY_S),
	KEY(0, 4, KEY_A),
	KEY(0, 5, KEY_Z),
	KEY(0, 7, KEY_FN),

	KEY(1, 7, KEY_LEFTMETA),

	KEY(2, 6, KEY_RIGHTALT),
	KEY(2, 7, KEY_LEFTALT),

	KEY(3, 0, KEY_5),
	KEY(3, 1, KEY_4),
	KEY(3, 2, KEY_R),
	KEY(3, 3, KEY_E),
	KEY(3, 4, KEY_F),
	KEY(3, 5, KEY_D),
	KEY(3, 6, KEY_X),

	KEY(4, 0, KEY_7),
	KEY(4, 1, KEY_6),
	KEY(4, 2, KEY_T),
	KEY(4, 3, KEY_H),
	KEY(4, 4, KEY_G),
	KEY(4, 5, KEY_V),
	KEY(4, 6, KEY_C),
	KEY(4, 7, KEY_SPACE),

	KEY(5, 0, KEY_9),
	KEY(5, 1, KEY_8),
	KEY(5, 2, KEY_U),
	KEY(5, 3, KEY_Y),
	KEY(5, 4, KEY_J),
	KEY(5, 5, KEY_N),
	KEY(5, 6, KEY_B),
	KEY(5, 7, KEY_BACKSLASH),

	KEY(6, 0, KEY_MINUS),
	KEY(6, 1, KEY_0),
	KEY(6, 2, KEY_O),
	KEY(6, 3, KEY_I),
	KEY(6, 4, KEY_L),
	KEY(6, 5, KEY_K),
	KEY(6, 6, KEY_COMMA),
	KEY(6, 7, KEY_M),

	KEY(7, 1, KEY_EQUAL),
	KEY(7, 2, KEY_RIGHTBRACE),
	KEY(7, 3, KEY_ENTER),
	KEY(7, 7, KEY_MENU),

	KEY(8, 4, KEY_RIGHTSHIFT),
	KEY(8, 5, KEY_LEFTSHIFT),

	KEY(9, 5, KEY_RIGHTCTRL),
	KEY(9, 7, KEY_LEFTCTRL),

	KEY(11, 0, KEY_LEFTBRACE),
	KEY(11, 1, KEY_P),
	KEY(11, 2, KEY_APOSTROPHE),
	KEY(11, 3, KEY_SEMICOLON),
	KEY(11, 4, KEY_SLASH),
	KEY(11, 5, KEY_DOT),

	KEY(12, 0, KEY_F10),
	KEY(12, 1, KEY_F9),
	KEY(12, 2, KEY_BACKSPACE),
	KEY(12, 3, KEY_3),
	KEY(12, 4, KEY_2),
	KEY(12, 5, KEY_UP),
	KEY(12,