1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Linus Nielsen Feltzing
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "button.h"
#include "backlight.h"
#include "backlight-target.h"
#include "avic-imx31.h"
#include "ccm-imx31.h"
#include "mc13783.h"
/* Most code in here is taken from the Linux BSP provided by Freescale
* Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved. */
static uint32_t int_btn = BUTTON_NONE;
static bool hold_button = false;
#ifdef BOOTLOADER
static bool initialized = false;
#else
static bool hold_button_old = false;
#endif
#define _button_hold() (GPIO3_DR & 0x10)
static __attribute__((interrupt("IRQ"))) void KPP_HANDLER(void)
{
static const struct key_mask_shift
{
uint8_t mask;
uint8_t shift;
} kms[3] =
{
{ 0x1f, 0 }, /* BUTTON_LEFT...BUTTON_SELECT */
{ 0x03, 5 }, /* BUTTON_BACK...BUTTON_MENU */
{ 0x1f, 7 }, /* BUTTON_VOL_UP...BUTTON_NEXT */
};
int col;
/* Power button is handled separately on PMIC, remote read in headphone
* jack driver. */
#ifdef HAVE_HEADPHONE_DETECTION
int button = int_btn & (BUTTON_POWER | BUTTON_REMOTE);
#else
int button = int_btn & BUTTON_POWER;
#endif
int oldlevel = disable_irq_save();
/* 1. Disable both (depress and release) keypad interrupts. */
KPP_KPSR &= ~(KPP_KPSR_KRIE | KPP_KPSR_KDIE);
for (col = 0; col < 3; col++) /* Col */
{
/* 2. Write 1s to KPDR[10:8] setting column data to 1s */
KPP_KPDR |= (0x7 << 8);
/* 3. Configure columns as totem pole outputs(for quick
* discharging of keypad capacitance) */
KPP_KPCR &= ~(0x7 << 8);
/* Give the columns time to discharge */
udelay(2);
/* 4. Configure columns as open-drain */
KPP_KPCR |= (0x7 << 8);
/* 5. Write a single column to 0, others to 1.
* 6. Sample row inputs and save data. Multiple key presses
* can be detected on a single column.
* 7. Repeat steps 2 - 6 for remaining columns. */
/* Col bit starts at 8th bit in KPDR */
KPP_KPDR &= ~(0x100 << col);
/* Delay added to avoid propagating the 0 from column to row
* when scanning. */
udelay(2);
/* Read row input */
button |= (~KPP_KPDR & kms[col].mask) << kms[col].shift;
}
/* 8. Return all columns to 0 in preparation for standby mode. */
KPP_KPDR &= ~(0x7 << 8);
/* 9. Clear KPKD and KPKR status bit(s) by writing to a .1.,
* set the KPKR synchronizer chain by writing "1" to KRSS register,
* clear the KPKD synchronizer chain by writing "1" to KDSC register */
KPP_KPSR = KPP_KPSR_KRSS | KPP_KPSR_KDSC | KPP_KPSR_KPKR | KPP_KPSR_KPKD;
/* 10. Re-enable the appropriate keypad interrupt(s) so that the KDIE
* detects a key hold condition, or the KRIE detects a key-release
* event. */
if ((button & ~BUTTON_POWER) != BUTTON_NONE)
KPP_KPSR |= KPP_KPSR_KRIE;
else
KPP_KPSR |= KPP_KPSR_KDIE;
int_btn = button;
restore_irq(oldlevel);
}
bool button_hold(void)
{
return _button_hold();
}
#ifdef HAVE_HEADPHONE_DETECTION
/* Headphone driver pushes the data here */
void button_headphone_set(int button)
{
int oldstatus = disable_irq_save();
int_btn = (int_btn & ~BUTTON_REMOTE) | button;
restore_irq(oldstatus);
}
#endif
int button_read_device(void)
{
/* Simple poll of GPIO status */
hold_button = _button_hold();
#ifndef BOOTLOADER
/* Backlight hold handling */
if (hold_button != hold_button_old)
{
hold_button_old = hold_button;
backlight_hold_changed(hold_button);
}
#endif
/* Enable the keypad interrupt to cause it to fire if a key is down.
* KPP_HANDLER will clear and disable it after the scan. If no key
* is depressed then this bit will already be set in waiting for the
* first key down event. */
KPP_KPSR |= KPP_KPSR_KDIE;
#ifdef HAVE_HEADPHONE_DETECTION
/* If hold, ignore any pressed button. Remote has its own hold
* switch, so return state regardless. */
return hold_button ? (int_btn & BUTTON_REMOTE) : int_btn;
#else
/* If hold, ignore any pressed button. */
return hold_button ? BUTTON_NONE : int_btn;
#endif
}
/* This is called from the mc13783 interrupt thread */
void button_power_event(void)
{
bool pressed =
(mc13783_read(MC13783_INTERRUPT_SENSE1) & MC13783_ONOFD1S) == 0;
/* Prevent KPP_HANDLER from changing things */
int oldlevel = disable_irq_save();
if (pressed)
{
int_btn |= BUTTON_POWER;
}
else
{
int_btn &= ~BUTTON_POWER;
}
restore_irq(oldlevel);
}
void button_init_device(void)
{
#ifdef BOOTLOADER
/* Can be called more than once in the bootloader */
if (initialized)
return;
initialized = true;
#endif
/* Enable keypad clock */
ccm_module_clock_gating(CG_KPP, CGM_ON_RUN_WAIT);
/* 1. Enable number of rows in keypad (KPCR[4:0])
*
* Configure the rows/cols in KPP
* LSB nybble in KPP is for 5 rows
* MSB nybble in KPP is for 3 cols */
KPP_KPCR |= 0x1f;
/* 2. Write 0's to KPDR[10:8] */
KPP_KPDR &= ~(0x7 << 8);
/* 3. Configure the keypad columns as open-drain (KPCR[10:8]). */
KPP_KPCR |= (0x7 << 8);
/* 4. Configure columns as output, rows as input (KDDR[10:8,4:0]) */
KPP_KDDR = (KPP_KDDR | (0x7 << 8)) & ~0x1f;
/* 5. Clear the KPKD Status Flag and Synchronizer chain.
* 6. Set the KDIE control bit bit. */
KPP_KPSR = KPP_KPSR_KDIE | KPP_KPSR_KRSS | KPP_KPSR_KDSC | KPP_KPSR_KPKD;
avic_enable_int(INT_KPP, INT_TYPE_IRQ, INT_PRIO_DEFAULT, KPP_HANDLER);
button_power_event();
mc13783_enable_event(MC13783_ONOFD1_EVENT);
#ifdef HAVE_HEADPHONE_DETECTION
headphone_init();
#endif
}
#ifdef BUTTON_DRIVER_CLOSE
void button_close_device(void)
{
int oldlevel = disable_irq_save();
avic_disable_int(INT_KPP);
KPP_KPSR &= ~(KPP_KPSR_KRIE | KPP_KPSR_KDIE);
int_btn = BUTTON_NONE;
restore_irq(oldlevel);
}
#endif /* BUTTON_DRIVER_CLOSE */
|
