summaryrefslogtreecommitdiffstats
path: root/firmware/target/arm/ipod/button-mini1g.c
blob: d4fc1327a9939ee32ce67f14cda20c69f52aa580 (plain)
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
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 by Daniel Stenberg
 *
 * iPod driver based on code from the ipodlinux project - http://ipodlinux.org
 * Adapted for Rockbox in December 2005
 * Original file: linux/arch/armnommu/mach-ipod/keyboard.c
 * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
 *
 *
 * 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.
 *
 ****************************************************************************/

/*
 * Rockbox button functions
 */

#include <stdlib.h>
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "button.h"
#include "kernel.h"
#include "backlight.h"
#include "serial.h"
#include "power.h"
#include "powermgmt.h"

#define WHEELCLICKS_PER_ROTATION  96
#define WHEEL_BASE_SENSITIVITY     6 /* Compute every ... clicks */
#define WHEEL_REPEAT_VELOCITY     45 /* deg/s */
#define WHEEL_SMOOTHING_VELOCITY 100 /* deg/s */

/* Variable to use for setting button status in interrupt handler */
int int_btn = BUTTON_NONE;

static void handle_scroll_wheel(int new_scroll)
{
    static const signed char scroll_state[4][4] = {
        {0, 1, -1, 0},
        {-1, 0, 0, 1},
        {1, 0, 0, -1},
        {0, -1, 1, 0}
    };

    static int prev_scroll = -1;
    static int direction = 0;
    static int count = 0;
    static long nextbacklight_hw_on = 0;

    int wheel_keycode = BUTTON_NONE;
    int scroll;

    static unsigned long wheel_delta = 1ul << 24;
    static unsigned long wheel_velocity = 0;
    static unsigned long last_wheel_usec = 0;
    static int prev_keypost = BUTTON_NONE;

    unsigned long usec;
    unsigned long v;

    if ( prev_scroll == -1 ) {
        prev_scroll = new_scroll;
        return;
    }
    
    scroll = scroll_state[prev_scroll][new_scroll];
    prev_scroll = new_scroll;

    if (direction != scroll) {
        /* direction reversal or was hold - reset all */
        direction = scroll;
        count = 0;
        prev_keypost = BUTTON_NONE;
        wheel_velocity = 0;
        wheel_delta = 1ul << 24;
        return;
    }

   /* poke backlight every 1/4s of activity */
    if (TIME_AFTER(current_tick, nextbacklight_hw_on)) {
        backlight_on();
        reset_poweroff_timer();
        nextbacklight_hw_on = current_tick + HZ/4;
    }

    if (++count < WHEEL_BASE_SENSITIVITY)
        return;

    count = 0;
    /* Mini 1st Gen wheel has inverse direction mapping
     * compared to 1st..3rd Gen wheel. */
    switch (direction) {
        case 1:
            wheel_keycode = BUTTON_SCROLL_FWD;
            break;
        case -1:
            wheel_keycode = BUTTON_SCROLL_BACK;
            break;
        default:
            /* only happens if we get out of sync */
            break;
    }

    /* have a keycode */

    usec = USEC_TIMER;
    v = usec - last_wheel_usec;

    /* calculate deg/s based upon sensitivity-adjusted interrupt period */

    if ((long)v <= 0) {
        /* timer wrapped (no activity for awhile), skip acceleration */
        v = 0;
        wheel_delta = 1ul << 24;
    }
    else {
        if (v > 0xfffffffful/WHEELCLICKS_PER_ROTATION) {
            v = 0xfffffffful/WHEELCLICKS_PER_ROTATION; /* check overflow below */
        }

        v = 360000000ul*WHEEL_BASE_SENSITIVITY / (v*WHEELCLICKS_PER_ROTATION);

        if (v > 0xfffffful)
            v = 0xfffffful; /* limit to 24 bits */
    }

    if (v < WHEEL_SMOOTHING_VELOCITY) {
        /* very slow - no smoothing */
        wheel_velocity = v;
        /* ensure backlight never gets stuck for an extended period if tick
         * wrapped such that next poke is very far ahead */
        nextbacklight_hw_on = current_tick - 1;
    }
    else {
        /* some velocity filtering to smooth things out */
        wheel_velocity = (7*wheel_velocity + v) / 8;
    }

    if (button_queue_empty()) {
        int key = wheel_keycode;

        if (v >= WHEEL_REPEAT_VELOCITY && prev_keypost == key) {
            /* quick enough and same key is being posted more than once in a
             * row - generate repeats - use unsmoothed v to guage */
            key |= BUTTON_REPEAT;
        }

        prev_keypost = wheel_keycode;

        /* post wheel keycode with wheel data */
        button_queue_post(key,
                   (wheel_velocity >= WHEEL_ACCEL_START ? (1ul << 31) : 0)
                    | wheel_delta | wheel_velocity);
        /* message posted - reset delta */
        wheel_delta = 1ul << 24;
    }
    else {
        /* skipped post - increment delta and limit to 7 bits */
        wheel_delta += 1ul << 24;

        if (wheel_delta > (0x7ful << 24))
            wheel_delta = 0x7ful << 24;
    }

    last_wheel_usec = usec;
}

/* mini 1 only, mini 2G uses iPod 4G code */
static int ipod_mini_button_read(void)
{
    unsigned char source, wheel_source, state, wheel_state;
    int btn = BUTTON_NONE;

    /* The ipodlinux source had a udelay(250) here, but testing has shown that
       it is not needed - tested on mini 1g. */
    /* udelay(250);*/

    /* get source(s) of interupt */
    source = GPIOA_INT_STAT & 0x3f;
    wheel_source = GPIOB_INT_STAT & 0x30;

    if (source == 0 && wheel_source == 0) {
        return BUTTON_NONE; /* not for us */
    }

    /* get current keypad & wheel status */
    state = GPIOA_INPUT_VAL & 0x3f;
    wheel_state = GPIOB_INPUT_VAL & 0x30;

    /* toggle interrupt level */
    GPIOA_INT_LEV = ~state;
    GPIOB_INT_LEV = ~wheel_state;

   /* ack any active interrupts */
    if (source)
        GPIOA_INT_CLR = source;
    if (wheel_source)
        GPIOB_INT_CLR = wheel_source;

   if (button_hold())
        return BUTTON_NONE;

    /* hold switch causes all outputs to go low    */
    /* we shouldn't interpret these as key presses */
        if (!(state & 0x1))
            btn |= BUTTON_SELECT;
        if (!(state & 0x2))
            btn |= BUTTON_MENU;
        if (!(state & 0x4))
            btn |= BUTTON_PLAY;
        if (!(state & 0x8))
            btn |= BUTTON_RIGHT;
        if (!(state & 0x10))
            btn |= BUTTON_LEFT;

        if (wheel_source & 0x30) {
            handle_scroll_wheel((wheel_state & 0x30) >> 4);
        }

    return btn;
}

void ipod_mini_button_int(void)
{
    CPU_HI_INT_DIS = GPIO0_MASK;
    int_btn = ipod_mini_button_read();
    //CPU_INT_EN = 0x40000000;
    CPU_HI_INT_EN = GPIO0_MASK;
}

void button_init_device(void)
{
    /* iPod Mini G1 */
    /* buttons - enable as input */
    GPIOA_ENABLE |= 0x3f;
    GPIOA_OUTPUT_EN &= ~0x3f;
    /* scroll wheel- enable as input */
    GPIOB_ENABLE |= 0x30; /* port b 4,5 */
    GPIOB_OUTPUT_EN &= ~0x30; /* port b 4,5 */
    /* buttons - set interrupt levels */
    GPIOA_INT_LEV = ~(GPIOA_INPUT_VAL & 0x3f);
    GPIOA_INT_CLR = GPIOA_INT_STAT & 0x3f;
    /* scroll wheel - set interrupt levels */
    GPIOB_INT_LEV = ~(GPIOB_INPUT_VAL & 0x30);
    GPIOB_INT_CLR = GPIOB_INT_STAT & 0x30;
    /* enable interrupts */
    GPIOA_INT_EN = 0x3f;
    GPIOB_INT_EN = 0x30;
    /* unmask interrupt */
    CPU_INT_EN = 0x40000000;
    CPU_HI_INT_EN = GPIO0_MASK;
}

/*
 * Get button pressed from hardware
 */
int button_read_device(void)
{
    static bool hold_button = false;
    bool hold_button_old;

    /* normal buttons */
    hold_button_old = hold_button;
    hold_button = button_hold();

    if (hold_button != hold_button_old)
        backlight_hold_changed(hold_button);

    /* The int_btn variable is set in the button interrupt handler */
    return int_btn;
}

bool button_hold(void)
{
    return (GPIOA_INPUT_VAL & 0x20)?false:true;
}

bool headphones_inserted(void)
{
    return (GPIOA_INPUT_VAL & 0x80)?true:false;
}