971 строка
23 KiB
C
971 строка
23 KiB
C
/*
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* Keyboard class input driver for the NVIDIA Tegra SoC internal matrix
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* keyboard controller
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*
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* Copyright (c) 2009-2011, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/clk.h>
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#include <linux/slab.h>
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#include <linux/input/tegra_kbc.h>
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#include <mach/clk.h>
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#define KBC_MAX_DEBOUNCE_CNT 0x3ffu
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/* KBC row scan time and delay for beginning the row scan. */
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#define KBC_ROW_SCAN_TIME 16
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#define KBC_ROW_SCAN_DLY 5
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/* KBC uses a 32KHz clock so a cycle = 1/32Khz */
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#define KBC_CYCLE_MS 32
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/* KBC Registers */
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/* KBC Control Register */
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#define KBC_CONTROL_0 0x0
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#define KBC_FIFO_TH_CNT_SHIFT(cnt) (cnt << 14)
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#define KBC_DEBOUNCE_CNT_SHIFT(cnt) (cnt << 4)
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#define KBC_CONTROL_FIFO_CNT_INT_EN (1 << 3)
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#define KBC_CONTROL_KEYPRESS_INT_EN (1 << 1)
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#define KBC_CONTROL_KBC_EN (1 << 0)
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/* KBC Interrupt Register */
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#define KBC_INT_0 0x4
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#define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2)
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#define KBC_INT_KEYPRESS_INT_STATUS (1 << 0)
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#define KBC_ROW_CFG0_0 0x8
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#define KBC_COL_CFG0_0 0x18
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#define KBC_TO_CNT_0 0x24
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#define KBC_INIT_DLY_0 0x28
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#define KBC_RPT_DLY_0 0x2c
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#define KBC_KP_ENT0_0 0x30
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#define KBC_KP_ENT1_0 0x34
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#define KBC_ROW0_MASK_0 0x38
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#define KBC_ROW_SHIFT 3
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struct tegra_kbc {
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void __iomem *mmio;
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struct input_dev *idev;
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unsigned int irq;
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spinlock_t lock;
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unsigned int repoll_dly;
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unsigned long cp_dly_jiffies;
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unsigned int cp_to_wkup_dly;
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bool use_fn_map;
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bool use_ghost_filter;
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bool keypress_caused_wake;
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const struct tegra_kbc_platform_data *pdata;
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unsigned short keycode[KBC_MAX_KEY * 2];
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unsigned short current_keys[KBC_MAX_KPENT];
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unsigned int num_pressed_keys;
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u32 wakeup_key;
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struct timer_list timer;
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struct clk *clk;
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};
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static const u32 tegra_kbc_default_keymap[] __devinitdata = {
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KEY(0, 2, KEY_W),
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KEY(0, 3, KEY_S),
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KEY(0, 4, KEY_A),
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KEY(0, 5, KEY_Z),
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KEY(0, 7, KEY_FN),
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KEY(1, 7, KEY_LEFTMETA),
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KEY(2, 6, KEY_RIGHTALT),
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KEY(2, 7, KEY_LEFTALT),
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KEY(3, 0, KEY_5),
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KEY(3, 1, KEY_4),
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KEY(3, 2, KEY_R),
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KEY(3, 3, KEY_E),
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KEY(3, 4, KEY_F),
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KEY(3, 5, KEY_D),
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KEY(3, 6, KEY_X),
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KEY(4, 0, KEY_7),
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KEY(4, 1, KEY_6),
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KEY(4, 2, KEY_T),
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KEY(4, 3, KEY_H),
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KEY(4, 4, KEY_G),
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KEY(4, 5, KEY_V),
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KEY(4, 6, KEY_C),
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KEY(4, 7, KEY_SPACE),
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KEY(5, 0, KEY_9),
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KEY(5, 1, KEY_8),
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KEY(5, 2, KEY_U),
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KEY(5, 3, KEY_Y),
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KEY(5, 4, KEY_J),
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KEY(5, 5, KEY_N),
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KEY(5, 6, KEY_B),
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KEY(5, 7, KEY_BACKSLASH),
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KEY(6, 0, KEY_MINUS),
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KEY(6, 1, KEY_0),
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KEY(6, 2, KEY_O),
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KEY(6, 3, KEY_I),
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KEY(6, 4, KEY_L),
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KEY(6, 5, KEY_K),
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KEY(6, 6, KEY_COMMA),
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KEY(6, 7, KEY_M),
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KEY(7, 1, KEY_EQUAL),
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KEY(7, 2, KEY_RIGHTBRACE),
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KEY(7, 3, KEY_ENTER),
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KEY(7, 7, KEY_MENU),
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KEY(8, 4, KEY_RIGHTSHIFT),
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KEY(8, 5, KEY_LEFTSHIFT),
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KEY(9, 5, KEY_RIGHTCTRL),
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KEY(9, 7, KEY_LEFTCTRL),
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KEY(11, 0, KEY_LEFTBRACE),
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KEY(11, 1, KEY_P),
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KEY(11, 2, KEY_APOSTROPHE),
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KEY(11, 3, KEY_SEMICOLON),
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KEY(11, 4, KEY_SLASH),
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KEY(11, 5, KEY_DOT),
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KEY(12, 0, KEY_F10),
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KEY(12, 1, KEY_F9),
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KEY(12, 2, KEY_BACKSPACE),
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KEY(12, 3, KEY_3),
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KEY(12, 4, KEY_2),
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KEY(12, 5, KEY_UP),
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KEY(12, 6, KEY_PRINT),
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KEY(12, 7, KEY_PAUSE),
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KEY(13, 0, KEY_INSERT),
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KEY(13, 1, KEY_DELETE),
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KEY(13, 3, KEY_PAGEUP),
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KEY(13, 4, KEY_PAGEDOWN),
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KEY(13, 5, KEY_RIGHT),
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KEY(13, 6, KEY_DOWN),
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KEY(13, 7, KEY_LEFT),
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KEY(14, 0, KEY_F11),
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KEY(14, 1, KEY_F12),
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KEY(14, 2, KEY_F8),
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KEY(14, 3, KEY_Q),
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KEY(14, 4, KEY_F4),
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KEY(14, 5, KEY_F3),
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KEY(14, 6, KEY_1),
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KEY(14, 7, KEY_F7),
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KEY(15, 0, KEY_ESC),
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KEY(15, 1, KEY_GRAVE),
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KEY(15, 2, KEY_F5),
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KEY(15, 3, KEY_TAB),
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KEY(15, 4, KEY_F1),
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KEY(15, 5, KEY_F2),
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KEY(15, 6, KEY_CAPSLOCK),
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KEY(15, 7, KEY_F6),
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/* Software Handled Function Keys */
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KEY(20, 0, KEY_KP7),
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KEY(21, 0, KEY_KP9),
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KEY(21, 1, KEY_KP8),
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KEY(21, 2, KEY_KP4),
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KEY(21, 4, KEY_KP1),
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KEY(22, 1, KEY_KPSLASH),
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KEY(22, 2, KEY_KP6),
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KEY(22, 3, KEY_KP5),
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KEY(22, 4, KEY_KP3),
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KEY(22, 5, KEY_KP2),
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KEY(22, 7, KEY_KP0),
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KEY(27, 1, KEY_KPASTERISK),
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KEY(27, 3, KEY_KPMINUS),
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KEY(27, 4, KEY_KPPLUS),
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KEY(27, 5, KEY_KPDOT),
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KEY(28, 5, KEY_VOLUMEUP),
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KEY(29, 3, KEY_HOME),
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KEY(29, 4, KEY_END),
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KEY(29, 5, KEY_BRIGHTNESSDOWN),
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KEY(29, 6, KEY_VOLUMEDOWN),
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KEY(29, 7, KEY_BRIGHTNESSUP),
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KEY(30, 0, KEY_NUMLOCK),
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KEY(30, 1, KEY_SCROLLLOCK),
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KEY(30, 2, KEY_MUTE),
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KEY(31, 4, KEY_HELP),
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};
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static const
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struct matrix_keymap_data tegra_kbc_default_keymap_data __devinitdata = {
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.keymap = tegra_kbc_default_keymap,
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.keymap_size = ARRAY_SIZE(tegra_kbc_default_keymap),
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};
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static void tegra_kbc_report_released_keys(struct input_dev *input,
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unsigned short old_keycodes[],
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unsigned int old_num_keys,
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unsigned short new_keycodes[],
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unsigned int new_num_keys)
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{
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unsigned int i, j;
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for (i = 0; i < old_num_keys; i++) {
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for (j = 0; j < new_num_keys; j++)
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if (old_keycodes[i] == new_keycodes[j])
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break;
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if (j == new_num_keys)
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input_report_key(input, old_keycodes[i], 0);
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}
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}
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static void tegra_kbc_report_pressed_keys(struct input_dev *input,
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unsigned char scancodes[],
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unsigned short keycodes[],
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unsigned int num_pressed_keys)
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{
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unsigned int i;
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for (i = 0; i < num_pressed_keys; i++) {
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input_event(input, EV_MSC, MSC_SCAN, scancodes[i]);
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input_report_key(input, keycodes[i], 1);
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}
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}
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static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
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{
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unsigned char scancodes[KBC_MAX_KPENT];
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unsigned short keycodes[KBC_MAX_KPENT];
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u32 val = 0;
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unsigned int i;
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unsigned int num_down = 0;
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bool fn_keypress = false;
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bool key_in_same_row = false;
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bool key_in_same_col = false;
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for (i = 0; i < KBC_MAX_KPENT; i++) {
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if ((i % 4) == 0)
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val = readl(kbc->mmio + KBC_KP_ENT0_0 + i);
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if (val & 0x80) {
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unsigned int col = val & 0x07;
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unsigned int row = (val >> 3) & 0x0f;
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unsigned char scancode =
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MATRIX_SCAN_CODE(row, col, KBC_ROW_SHIFT);
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scancodes[num_down] = scancode;
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keycodes[num_down] = kbc->keycode[scancode];
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/* If driver uses Fn map, do not report the Fn key. */
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if ((keycodes[num_down] == KEY_FN) && kbc->use_fn_map)
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fn_keypress = true;
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else
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num_down++;
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}
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val >>= 8;
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}
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/*
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* Matrix keyboard designs are prone to keyboard ghosting.
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* Ghosting occurs if there are 3 keys such that -
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* any 2 of the 3 keys share a row, and any 2 of them share a column.
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* If so ignore the key presses for this iteration.
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*/
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if (kbc->use_ghost_filter && num_down >= 3) {
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for (i = 0; i < num_down; i++) {
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unsigned int j;
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u8 curr_col = scancodes[i] & 0x07;
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u8 curr_row = scancodes[i] >> KBC_ROW_SHIFT;
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/*
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* Find 2 keys such that one key is in the same row
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* and the other is in the same column as the i-th key.
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*/
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for (j = i + 1; j < num_down; j++) {
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u8 col = scancodes[j] & 0x07;
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u8 row = scancodes[j] >> KBC_ROW_SHIFT;
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if (col == curr_col)
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key_in_same_col = true;
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if (row == curr_row)
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key_in_same_row = true;
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}
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}
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}
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/*
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* If the platform uses Fn keymaps, translate keys on a Fn keypress.
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* Function keycodes are KBC_MAX_KEY apart from the plain keycodes.
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*/
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if (fn_keypress) {
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for (i = 0; i < num_down; i++) {
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scancodes[i] += KBC_MAX_KEY;
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keycodes[i] = kbc->keycode[scancodes[i]];
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}
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}
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/* Ignore the key presses for this iteration? */
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if (key_in_same_col && key_in_same_row)
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return;
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tegra_kbc_report_released_keys(kbc->idev,
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kbc->current_keys, kbc->num_pressed_keys,
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keycodes, num_down);
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tegra_kbc_report_pressed_keys(kbc->idev, scancodes, keycodes, num_down);
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input_sync(kbc->idev);
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memcpy(kbc->current_keys, keycodes, sizeof(kbc->current_keys));
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kbc->num_pressed_keys = num_down;
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}
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static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable)
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{
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u32 val;
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val = readl(kbc->mmio + KBC_CONTROL_0);
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if (enable)
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val |= KBC_CONTROL_FIFO_CNT_INT_EN;
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else
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val &= ~KBC_CONTROL_FIFO_CNT_INT_EN;
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writel(val, kbc->mmio + KBC_CONTROL_0);
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}
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static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable)
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{
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u32 val;
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val = readl(kbc->mmio + KBC_CONTROL_0);
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if (enable)
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val |= KBC_CONTROL_KEYPRESS_INT_EN;
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else
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val &= ~KBC_CONTROL_KEYPRESS_INT_EN;
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writel(val, kbc->mmio + KBC_CONTROL_0);
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}
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static void tegra_kbc_keypress_timer(unsigned long data)
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{
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struct tegra_kbc *kbc = (struct tegra_kbc *)data;
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unsigned long flags;
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u32 val;
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unsigned int i;
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spin_lock_irqsave(&kbc->lock, flags);
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val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf;
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if (val) {
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unsigned long dly;
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tegra_kbc_report_keys(kbc);
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/*
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* If more than one keys are pressed we need not wait
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* for the repoll delay.
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*/
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dly = (val == 1) ? kbc->repoll_dly : 1;
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mod_timer(&kbc->timer, jiffies + msecs_to_jiffies(dly));
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} else {
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/* Release any pressed keys and exit the polling loop */
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for (i = 0; i < kbc->num_pressed_keys; i++)
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input_report_key(kbc->idev, kbc->current_keys[i], 0);
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input_sync(kbc->idev);
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kbc->num_pressed_keys = 0;
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/* All keys are released so enable the keypress interrupt */
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tegra_kbc_set_fifo_interrupt(kbc, true);
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}
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spin_unlock_irqrestore(&kbc->lock, flags);
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}
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static irqreturn_t tegra_kbc_isr(int irq, void *args)
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{
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struct tegra_kbc *kbc = args;
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unsigned long flags;
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u32 val;
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spin_lock_irqsave(&kbc->lock, flags);
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/*
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* Quickly bail out & reenable interrupts if the fifo threshold
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* count interrupt wasn't the interrupt source
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*/
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val = readl(kbc->mmio + KBC_INT_0);
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writel(val, kbc->mmio + KBC_INT_0);
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if (val & KBC_INT_FIFO_CNT_INT_STATUS) {
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/*
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* Until all keys are released, defer further processing to
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* the polling loop in tegra_kbc_keypress_timer.
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*/
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tegra_kbc_set_fifo_interrupt(kbc, false);
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mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies);
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} else if (val & KBC_INT_KEYPRESS_INT_STATUS) {
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/* We can be here only through system resume path */
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kbc->keypress_caused_wake = true;
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}
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spin_unlock_irqrestore(&kbc->lock, flags);
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return IRQ_HANDLED;
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}
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static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter)
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{
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const struct tegra_kbc_platform_data *pdata = kbc->pdata;
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int i;
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unsigned int rst_val;
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/* Either mask all keys or none. */
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rst_val = (filter && !pdata->wakeup) ? ~0 : 0;
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for (i = 0; i < KBC_MAX_ROW; i++)
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writel(rst_val, kbc->mmio + KBC_ROW0_MASK_0 + i * 4);
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}
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static void tegra_kbc_config_pins(struct tegra_kbc *kbc)
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{
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const struct tegra_kbc_platform_data *pdata = kbc->pdata;
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int i;
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for (i = 0; i < KBC_MAX_GPIO; i++) {
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u32 r_shft = 5 * (i % 6);
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u32 c_shft = 4 * (i % 8);
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u32 r_mask = 0x1f << r_shft;
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u32 c_mask = 0x0f << c_shft;
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u32 r_offs = (i / 6) * 4 + KBC_ROW_CFG0_0;
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u32 c_offs = (i / 8) * 4 + KBC_COL_CFG0_0;
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u32 row_cfg = readl(kbc->mmio + r_offs);
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u32 col_cfg = readl(kbc->mmio + c_offs);
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row_cfg &= ~r_mask;
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col_cfg &= ~c_mask;
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switch (pdata->pin_cfg[i].type) {
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case PIN_CFG_ROW:
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row_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << r_shft;
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break;
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case PIN_CFG_COL:
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col_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << c_shft;
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break;
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case PIN_CFG_IGNORE:
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break;
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}
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writel(row_cfg, kbc->mmio + r_offs);
|
|
writel(col_cfg, kbc->mmio + c_offs);
|
|
}
|
|
}
|
|
|
|
static int tegra_kbc_start(struct tegra_kbc *kbc)
|
|
{
|
|
const struct tegra_kbc_platform_data *pdata = kbc->pdata;
|
|
unsigned int debounce_cnt;
|
|
u32 val = 0;
|
|
|
|
clk_prepare_enable(kbc->clk);
|
|
|
|
/* Reset the KBC controller to clear all previous status.*/
|
|
tegra_periph_reset_assert(kbc->clk);
|
|
udelay(100);
|
|
tegra_periph_reset_deassert(kbc->clk);
|
|
udelay(100);
|
|
|
|
tegra_kbc_config_pins(kbc);
|
|
tegra_kbc_setup_wakekeys(kbc, false);
|
|
|
|
writel(pdata->repeat_cnt, kbc->mmio + KBC_RPT_DLY_0);
|
|
|
|
/* Keyboard debounce count is maximum of 12 bits. */
|
|
debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
|
|
val = KBC_DEBOUNCE_CNT_SHIFT(debounce_cnt);
|
|
val |= KBC_FIFO_TH_CNT_SHIFT(1); /* set fifo interrupt threshold to 1 */
|
|
val |= KBC_CONTROL_FIFO_CNT_INT_EN; /* interrupt on FIFO threshold */
|
|
val |= KBC_CONTROL_KBC_EN; /* enable */
|
|
writel(val, kbc->mmio + KBC_CONTROL_0);
|
|
|
|
/*
|
|
* Compute the delay(ns) from interrupt mode to continuous polling
|
|
* mode so the timer routine is scheduled appropriately.
|
|
*/
|
|
val = readl(kbc->mmio + KBC_INIT_DLY_0);
|
|
kbc->cp_dly_jiffies = usecs_to_jiffies((val & 0xfffff) * 32);
|
|
|
|
kbc->num_pressed_keys = 0;
|
|
|
|
/*
|
|
* Atomically clear out any remaining entries in the key FIFO
|
|
* and enable keyboard interrupts.
|
|
*/
|
|
while (1) {
|
|
val = readl(kbc->mmio + KBC_INT_0);
|
|
val >>= 4;
|
|
if (!val)
|
|
break;
|
|
|
|
val = readl(kbc->mmio + KBC_KP_ENT0_0);
|
|
val = readl(kbc->mmio + KBC_KP_ENT1_0);
|
|
}
|
|
writel(0x7, kbc->mmio + KBC_INT_0);
|
|
|
|
enable_irq(kbc->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra_kbc_stop(struct tegra_kbc *kbc)
|
|
{
|
|
unsigned long flags;
|
|
u32 val;
|
|
|
|
spin_lock_irqsave(&kbc->lock, flags);
|
|
val = readl(kbc->mmio + KBC_CONTROL_0);
|
|
val &= ~1;
|
|
writel(val, kbc->mmio + KBC_CONTROL_0);
|
|
spin_unlock_irqrestore(&kbc->lock, flags);
|
|
|
|
disable_irq(kbc->irq);
|
|
del_timer_sync(&kbc->timer);
|
|
|
|
clk_disable_unprepare(kbc->clk);
|
|
}
|
|
|
|
static int tegra_kbc_open(struct input_dev *dev)
|
|
{
|
|
struct tegra_kbc *kbc = input_get_drvdata(dev);
|
|
|
|
return tegra_kbc_start(kbc);
|
|
}
|
|
|
|
static void tegra_kbc_close(struct input_dev *dev)
|
|
{
|
|
struct tegra_kbc *kbc = input_get_drvdata(dev);
|
|
|
|
return tegra_kbc_stop(kbc);
|
|
}
|
|
|
|
static bool __devinit
|
|
tegra_kbc_check_pin_cfg(const struct tegra_kbc_platform_data *pdata,
|
|
struct device *dev, unsigned int *num_rows)
|
|
{
|
|
int i;
|
|
|
|
*num_rows = 0;
|
|
|
|
for (i = 0; i < KBC_MAX_GPIO; i++) {
|
|
const struct tegra_kbc_pin_cfg *pin_cfg = &pdata->pin_cfg[i];
|
|
|
|
switch (pin_cfg->type) {
|
|
case PIN_CFG_ROW:
|
|
if (pin_cfg->num >= KBC_MAX_ROW) {
|
|
dev_err(dev,
|
|
"pin_cfg[%d]: invalid row number %d\n",
|
|
i, pin_cfg->num);
|
|
return false;
|
|
}
|
|
(*num_rows)++;
|
|
break;
|
|
|
|
case PIN_CFG_COL:
|
|
if (pin_cfg->num >= KBC_MAX_COL) {
|
|
dev_err(dev,
|
|
"pin_cfg[%d]: invalid column number %d\n",
|
|
i, pin_cfg->num);
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case PIN_CFG_IGNORE:
|
|
break;
|
|
|
|
default:
|
|
dev_err(dev,
|
|
"pin_cfg[%d]: invalid entry type %d\n",
|
|
pin_cfg->type, pin_cfg->num);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct tegra_kbc_platform_data * __devinit tegra_kbc_dt_parse_pdata(
|
|
struct platform_device *pdev)
|
|
{
|
|
struct tegra_kbc_platform_data *pdata;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
u32 prop;
|
|
int i;
|
|
|
|
if (!np)
|
|
return NULL;
|
|
|
|
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return NULL;
|
|
|
|
if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop))
|
|
pdata->debounce_cnt = prop;
|
|
|
|
if (!of_property_read_u32(np, "nvidia,repeat-delay-ms", &prop))
|
|
pdata->repeat_cnt = prop;
|
|
|
|
if (of_find_property(np, "nvidia,needs-ghost-filter", NULL))
|
|
pdata->use_ghost_filter = true;
|
|
|
|
if (of_find_property(np, "nvidia,wakeup-source", NULL))
|
|
pdata->wakeup = true;
|
|
|
|
/*
|
|
* All currently known keymaps with device tree support use the same
|
|
* pin_cfg, so set it up here.
|
|
*/
|
|
for (i = 0; i < KBC_MAX_ROW; i++) {
|
|
pdata->pin_cfg[i].num = i;
|
|
pdata->pin_cfg[i].type = PIN_CFG_ROW;
|
|
}
|
|
|
|
for (i = 0; i < KBC_MAX_COL; i++) {
|
|
pdata->pin_cfg[KBC_MAX_ROW + i].num = i;
|
|
pdata->pin_cfg[KBC_MAX_ROW + i].type = PIN_CFG_COL;
|
|
}
|
|
|
|
return pdata;
|
|
}
|
|
#else
|
|
static inline struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata(
|
|
struct platform_device *pdev)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static int __devinit tegra_kbd_setup_keymap(struct tegra_kbc *kbc)
|
|
{
|
|
const struct tegra_kbc_platform_data *pdata = kbc->pdata;
|
|
const struct matrix_keymap_data *keymap_data = pdata->keymap_data;
|
|
unsigned int keymap_rows = KBC_MAX_KEY;
|
|
int retval;
|
|
|
|
if (keymap_data && pdata->use_fn_map)
|
|
keymap_rows *= 2;
|
|
|
|
retval = matrix_keypad_build_keymap(keymap_data, NULL,
|
|
keymap_rows, KBC_MAX_COL,
|
|
kbc->keycode, kbc->idev);
|
|
if (retval == -ENOSYS || retval == -ENOENT) {
|
|
/*
|
|
* If there is no OF support in kernel or keymap
|
|
* property is missing, use default keymap.
|
|
*/
|
|
retval = matrix_keypad_build_keymap(
|
|
&tegra_kbc_default_keymap_data, NULL,
|
|
keymap_rows, KBC_MAX_COL,
|
|
kbc->keycode, kbc->idev);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int __devinit tegra_kbc_probe(struct platform_device *pdev)
|
|
{
|
|
const struct tegra_kbc_platform_data *pdata = pdev->dev.platform_data;
|
|
struct tegra_kbc *kbc;
|
|
struct input_dev *input_dev;
|
|
struct resource *res;
|
|
int irq;
|
|
int err;
|
|
int num_rows = 0;
|
|
unsigned int debounce_cnt;
|
|
unsigned int scan_time_rows;
|
|
|
|
if (!pdata)
|
|
pdata = tegra_kbc_dt_parse_pdata(pdev);
|
|
|
|
if (!pdata)
|
|
return -EINVAL;
|
|
|
|
if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows)) {
|
|
err = -EINVAL;
|
|
goto err_free_pdata;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(&pdev->dev, "failed to get I/O memory\n");
|
|
err = -ENXIO;
|
|
goto err_free_pdata;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(&pdev->dev, "failed to get keyboard IRQ\n");
|
|
err = -ENXIO;
|
|
goto err_free_pdata;
|
|
}
|
|
|
|
kbc = kzalloc(sizeof(*kbc), GFP_KERNEL);
|
|
input_dev = input_allocate_device();
|
|
if (!kbc || !input_dev) {
|
|
err = -ENOMEM;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
kbc->pdata = pdata;
|
|
kbc->idev = input_dev;
|
|
kbc->irq = irq;
|
|
spin_lock_init(&kbc->lock);
|
|
setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc);
|
|
|
|
res = request_mem_region(res->start, resource_size(res), pdev->name);
|
|
if (!res) {
|
|
dev_err(&pdev->dev, "failed to request I/O memory\n");
|
|
err = -EBUSY;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
kbc->mmio = ioremap(res->start, resource_size(res));
|
|
if (!kbc->mmio) {
|
|
dev_err(&pdev->dev, "failed to remap I/O memory\n");
|
|
err = -ENXIO;
|
|
goto err_free_mem_region;
|
|
}
|
|
|
|
kbc->clk = clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(kbc->clk)) {
|
|
dev_err(&pdev->dev, "failed to get keyboard clock\n");
|
|
err = PTR_ERR(kbc->clk);
|
|
goto err_iounmap;
|
|
}
|
|
|
|
/*
|
|
* The time delay between two consecutive reads of the FIFO is
|
|
* the sum of the repeat time and the time taken for scanning
|
|
* the rows. There is an additional delay before the row scanning
|
|
* starts. The repoll delay is computed in milliseconds.
|
|
*/
|
|
debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
|
|
scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows;
|
|
kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + pdata->repeat_cnt;
|
|
kbc->repoll_dly = DIV_ROUND_UP(kbc->repoll_dly, KBC_CYCLE_MS);
|
|
|
|
kbc->wakeup_key = pdata->wakeup_key;
|
|
kbc->use_fn_map = pdata->use_fn_map;
|
|
kbc->use_ghost_filter = pdata->use_ghost_filter;
|
|
|
|
input_dev->name = pdev->name;
|
|
input_dev->id.bustype = BUS_HOST;
|
|
input_dev->dev.parent = &pdev->dev;
|
|
input_dev->open = tegra_kbc_open;
|
|
input_dev->close = tegra_kbc_close;
|
|
|
|
err = tegra_kbd_setup_keymap(kbc);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to setup keymap\n");
|
|
goto err_put_clk;
|
|
}
|
|
|
|
__set_bit(EV_REP, input_dev->evbit);
|
|
input_set_capability(input_dev, EV_MSC, MSC_SCAN);
|
|
|
|
input_set_drvdata(input_dev, kbc);
|
|
|
|
err = request_irq(kbc->irq, tegra_kbc_isr,
|
|
IRQF_NO_SUSPEND | IRQF_TRIGGER_HIGH, pdev->name, kbc);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to request keyboard IRQ\n");
|
|
goto err_put_clk;
|
|
}
|
|
|
|
disable_irq(kbc->irq);
|
|
|
|
err = input_register_device(kbc->idev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to register input device\n");
|
|
goto err_free_irq;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, kbc);
|
|
device_init_wakeup(&pdev->dev, pdata->wakeup);
|
|
|
|
return 0;
|
|
|
|
err_free_irq:
|
|
free_irq(kbc->irq, pdev);
|
|
err_put_clk:
|
|
clk_put(kbc->clk);
|
|
err_iounmap:
|
|
iounmap(kbc->mmio);
|
|
err_free_mem_region:
|
|
release_mem_region(res->start, resource_size(res));
|
|
err_free_mem:
|
|
input_free_device(input_dev);
|
|
kfree(kbc);
|
|
err_free_pdata:
|
|
if (!pdev->dev.platform_data)
|
|
kfree(pdata);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __devexit tegra_kbc_remove(struct platform_device *pdev)
|
|
{
|
|
struct tegra_kbc *kbc = platform_get_drvdata(pdev);
|
|
struct resource *res;
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
free_irq(kbc->irq, pdev);
|
|
clk_put(kbc->clk);
|
|
|
|
input_unregister_device(kbc->idev);
|
|
iounmap(kbc->mmio);
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(res->start, resource_size(res));
|
|
|
|
/*
|
|
* If we do not have platform data attached to the device we
|
|
* allocated it ourselves and thus need to free it.
|
|
*/
|
|
if (!pdev->dev.platform_data)
|
|
kfree(kbc->pdata);
|
|
|
|
kfree(kbc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int tegra_kbc_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct tegra_kbc *kbc = platform_get_drvdata(pdev);
|
|
|
|
mutex_lock(&kbc->idev->mutex);
|
|
if (device_may_wakeup(&pdev->dev)) {
|
|
disable_irq(kbc->irq);
|
|
del_timer_sync(&kbc->timer);
|
|
tegra_kbc_set_fifo_interrupt(kbc, false);
|
|
|
|
/* Forcefully clear the interrupt status */
|
|
writel(0x7, kbc->mmio + KBC_INT_0);
|
|
/*
|
|
* Store the previous resident time of continuous polling mode.
|
|
* Force the keyboard into interrupt mode.
|
|
*/
|
|
kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0);
|
|
writel(0, kbc->mmio + KBC_TO_CNT_0);
|
|
|
|
tegra_kbc_setup_wakekeys(kbc, true);
|
|
msleep(30);
|
|
|
|
kbc->keypress_caused_wake = false;
|
|
/* Enable keypress interrupt before going into suspend. */
|
|
tegra_kbc_set_keypress_interrupt(kbc, true);
|
|
enable_irq(kbc->irq);
|
|
enable_irq_wake(kbc->irq);
|
|
} else {
|
|
if (kbc->idev->users)
|
|
tegra_kbc_stop(kbc);
|
|
}
|
|
mutex_unlock(&kbc->idev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_kbc_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct tegra_kbc *kbc = platform_get_drvdata(pdev);
|
|
int err = 0;
|
|
|
|
mutex_lock(&kbc->idev->mutex);
|
|
if (device_may_wakeup(&pdev->dev)) {
|
|
disable_irq_wake(kbc->irq);
|
|
tegra_kbc_setup_wakekeys(kbc, false);
|
|
/* We will use fifo interrupts for key detection. */
|
|
tegra_kbc_set_keypress_interrupt(kbc, false);
|
|
|
|
/* Restore the resident time of continuous polling mode. */
|
|
writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0);
|
|
|
|
tegra_kbc_set_fifo_interrupt(kbc, true);
|
|
|
|
if (kbc->keypress_caused_wake && kbc->wakeup_key) {
|
|
/*
|
|
* We can't report events directly from the ISR
|
|
* because timekeeping is stopped when processing
|
|
* wakeup request and we get a nasty warning when
|
|
* we try to call do_gettimeofday() in evdev
|
|
* handler.
|
|
*/
|
|
input_report_key(kbc->idev, kbc->wakeup_key, 1);
|
|
input_sync(kbc->idev);
|
|
input_report_key(kbc->idev, kbc->wakeup_key, 0);
|
|
input_sync(kbc->idev);
|
|
}
|
|
} else {
|
|
if (kbc->idev->users)
|
|
err = tegra_kbc_start(kbc);
|
|
}
|
|
mutex_unlock(&kbc->idev->mutex);
|
|
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume);
|
|
|
|
static const struct of_device_id tegra_kbc_of_match[] = {
|
|
{ .compatible = "nvidia,tegra20-kbc", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tegra_kbc_of_match);
|
|
|
|
static struct platform_driver tegra_kbc_driver = {
|
|
.probe = tegra_kbc_probe,
|
|
.remove = __devexit_p(tegra_kbc_remove),
|
|
.driver = {
|
|
.name = "tegra-kbc",
|
|
.owner = THIS_MODULE,
|
|
.pm = &tegra_kbc_pm_ops,
|
|
.of_match_table = tegra_kbc_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(tegra_kbc_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Rakesh Iyer <riyer@nvidia.com>");
|
|
MODULE_DESCRIPTION("Tegra matrix keyboard controller driver");
|
|
MODULE_ALIAS("platform:tegra-kbc");
|