summaryrefslogtreecommitdiffstats
path: root/firmware/target/arm/ipod/button-clickwheel.c
blob: 3014405bbd1521a156c10ea65f2b467df014d66b (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
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/***************************************************************************
 *             __________               __   ___.
 *   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"
#ifdef IPOD_NANO2G
#include "pmu-target.h"
#endif
#if defined(IPOD_6G) || defined(IPOD_NANO3G) || defined(IPOD_NANO4G)
#include "pmu-target.h"
#include "clocking-s5l8702.h"
#endif

#define WHEEL_FAST_OFF_TIMEOUT   250000 /* timeout for acceleration = 250ms */
#define WHEEL_REPEAT_TIMEOUT     250000 /* timeout for button repeat = 250ms */
#define WHEEL_UNTOUCH_TIMEOUT    150000 /* timeout for untouching wheel = 150ms */

#ifdef CPU_PP
#define CLICKWHEEL_DATA   (*(volatile unsigned long*)(0x7000c140))
#elif CONFIG_CPU==S5L8701 || CONFIG_CPU==S5L8702 || CONFIG_CPU==S5L8720
#define CLICKWHEEL_DATA   WHEELRX
#else
#error CPU architecture not supported!
#endif

#define WHEELCLICKS_PER_ROTATION     96 /* wheelclicks per full rotation */

/* This amount of clicks is needed for at least scrolling 1 item. Choose small values 
 * to have high sensitivity but few precision, choose large values to have less 
 * sensitivity and good precision. */
#if defined(IPOD_NANO) || defined(IPOD_NANO2G)
#define WHEEL_SENSITIVITY 6 /* iPod nano has smaller wheel, lower sensitivity needed */
#else
#define WHEEL_SENSITIVITY 4 /* default sensitivity */
#endif

int  old_wheel_value  = -1;
int  new_wheel_value  = 0;
static int  repeat           = 0;
int  wheel_delta      = 0;
bool wheel_is_touched = false;
unsigned int  accumulated_wheel_delta = 0;
static unsigned int  wheel_repeat            = 0;
unsigned int  wheel_velocity          = 0;
static unsigned long last_wheel_usec         = 0;

/* Variable to use for setting button status in interrupt handler */
static int int_btn = BUTTON_NONE;
#ifdef HAVE_WHEEL_POSITION
    static int wheel_position = -1;
    static bool send_events = true;
#endif

#if CONFIG_CPU==S5L8701 || CONFIG_CPU==S5L8702 || CONFIG_CPU==S5L8720
static struct semaphore button_init_wakeup;
#endif

#ifdef CPU_PP
static void opto_i2c_init(void)
{
    DEV_EN |= DEV_OPTO;
    DEV_RS |= DEV_OPTO;
    udelay(5);
    DEV_RS &= ~DEV_OPTO; /* finish reset */
    DEV_INIT1 |= INIT_BUTTONS; /* enable buttons (needed for "hold"-detection) */

    outl(0xc00a1f00, 0x7000c100);
    outl(0x01000000, 0x7000c104);
}
#endif

static inline int ipod_4g_button_read(void)
{
    int whl = -1;
    int btn = BUTTON_NONE;

#ifdef CPU_PP    
    if ((inl(0x7000c104) & 0x04000000) != 0) 
    {
#endif
        unsigned status = CLICKWHEEL_DATA;

        if ((status & 0x800000ff) == 0x8000001a) 
        {
            if (status & 0x00000100)
                btn |= BUTTON_SELECT;
            if (status & 0x00000200)
                btn |= BUTTON_RIGHT;
            if (status & 0x00000400)
                btn |= BUTTON_LEFT;
            if (status & 0x00000800)
                btn |= BUTTON_PLAY;
            if (status & 0x00001000)
                btn |= BUTTON_MENU;
            if (status & 0x40000000) 
            {
                unsigned long usec = USEC_TIMER;
                
                /* Highest wheel = 0x5F, clockwise increases */
                new_wheel_value = (status >> 16) & 0x7f;
                whl = new_wheel_value;
                
                /* switch on backlight (again), reset power-off timer */
                backlight_on();
                reset_poweroff_timer();
                
                /* Check whether the scrollwheel was untouched by accident or by will. */
                /* This is needed because wheel may be untoched very shortly during rotation */
                if ( (!wheel_is_touched) && TIME_AFTER(usec, last_wheel_usec + WHEEL_UNTOUCH_TIMEOUT) )
                {
                    /* wheel has been really untouched -> reset internal variables */
                    old_wheel_value         = -1;
                    wheel_velocity          = 0;
                    accumulated_wheel_delta = 0;
                    wheel_repeat            = BUTTON_NONE;
                }
                else
                {
                    /* wheel was shortly untouched by accident -> leave internal variables */
                    wheel_is_touched = true;
                }

                if (old_wheel_value >= 0)
                {
                    /* This is for later = BUTTON_SCROLL_TOUCH;*/
                    wheel_delta = new_wheel_value - old_wheel_value;
                    unsigned int wheel_keycode = BUTTON_NONE;

                    /* Taking into account wrapping during transition from highest 
                     * to lowest wheel position and back */
                    if      (wheel_delta < -WHEELCLICKS_PER_ROTATION/2)
                        wheel_delta += WHEELCLICKS_PER_ROTATION; /* Forward wrapping case */
                    else if (wheel_delta >  WHEELCLICKS_PER_ROTATION/2)
                        wheel_delta -= WHEELCLICKS_PER_ROTATION; /* Backward wrapping case */
    
                    /* Getting direction and wheel_keycode from wheel_delta.
                     * Need at least some clicks to be sure to avoid haptic fuzziness */
                    if      (wheel_delta >=  WHEEL_SENSITIVITY)
                        wheel_keycode = BUTTON_SCROLL_FWD;
                    else if (wheel_delta <= -WHEEL_SENSITIVITY)
                        wheel_keycode = BUTTON_SCROLL_BACK;
                    else 
                        wheel_keycode = BUTTON_NONE;

                    if (wheel_keycode != BUTTON_NONE)
                    {
                        long v = (usec - last_wheel_usec) & 0x7fffffff;
                        
                        /* undo signedness */
                        wheel_delta = (wheel_delta>0) ? wheel_delta : -wheel_delta;
                        
                        /* add the current wheel_delta */
                        accumulated_wheel_delta += wheel_delta;

                        v = v ? (1000000 * wheel_delta) / v : 0;  /* clicks/sec = 1000000 * clicks/usec */
                        v = (v * 360) / WHEELCLICKS_PER_ROTATION; /* conversion to degree/sec */
                        v = (v<0) ? -v : v;                       /* undo signedness */
            
                        /* some velocity filtering to smooth things out */
                        wheel_velocity = (15 * wheel_velocity + v) / 16;
                        /* limit to 24 bit */
                        wheel_velocity = (wheel_velocity>0xffffff) ? 0xffffff : wheel_velocity;

                        /* assume REPEAT = off */
                        repeat = 0;
                        
                        /* direction reversals must nullify acceleration and accumulator */
                        if (wheel_keycode != wheel_repeat)
                        {
                            wheel_repeat            = wheel_keycode;
                            wheel_velocity          = 0;
                            accumulated_wheel_delta = 0;
                        }
                        /* on same direction REPEAT is assumed when new click is within timeout */
                        else if (TIME_BEFORE(usec, last_wheel_usec + WHEEL_REPEAT_TIMEOUT))
                        {
                            repeat = BUTTON_REPEAT;
                        }
                        /* timeout nullifies acceleration and accumulator */
                        if (TIME_AFTER(usec, last_wheel_usec + WHEEL_FAST_OFF_TIMEOUT))
                        {
                            wheel_velocity          = 0;
                            accumulated_wheel_delta = 0;
                        }

#ifdef HAVE_WHEEL_POSITION
                        if (send_events) 
#endif
                        /* The queue should have no other events when scrolling */
                        if (button_queue_empty())
                        {
                            /* each WHEEL_SENSITIVITY clicks = scrolling 1 item */
                            accumulated_wheel_delta /= WHEEL_SENSITIVITY;
#ifdef HAVE_SCROLLWHEEL
                            /* use data-format for HAVE_SCROLLWHEEL */
                            /* always use acceleration mode (1<<31) */
                            /* always set message post count to (1<<24) for iPod */
                            /* this way the scrolling is always calculated from wheel_velocity */
                            button_queue_post(wheel_keycode | repeat, 
                                       (1<<31) | (1 << 24) | wheel_velocity);
                                       
#else
                            button_queue_post(wheel_keycode | repeat, 
                                       (accumulated_wheel_delta << 16) | new_wheel_value);
#endif
                            accumulated_wheel_delta = 0;
                        }
                        last_wheel_usec = usec;
                        old_wheel_value = new_wheel_value;
                    }
                }
                else
                {
                    /* scrollwheel was touched for the first time after finger lifting */
                    old_wheel_value = new_wheel_value;
                    wheel_is_touched = true;
                }
            }
            else
            {
                /* In this case the finger was lifted from the scrollwheel. */
                wheel_is_touched = false; 
            }

        }
        else if ((status & 0x800000ff) != 0x8000003a &&
                 status != 0xFFFFFFFF)
        {
            udelay(2000);
            outl(inl(0x7000c100) & ~0x60000000, 0x7000c100);
            outl(inl(0x7000c104) | 0x04000000, 0x7000c104);
            outl(inl(0x7000c100) | 0x60000000, 0x7000c100);
        }
#if CONFIG_CPU==S5L8701 || CONFIG_CPU==S5L8702 || CONFIG_CPU==S5L8720
        else if ((status & 0x8000FFFF) == 0x8000023A)
        {
            if (status & 0x00010000)
                btn |= BUTTON_SELECT;
            if (status & 0x00020000)
                btn |= BUTTON_RIGHT;
            if (status & 0x00040000)
                btn |= BUTTON_LEFT;
            if (status & 0x00080000)
                btn |= BUTTON_PLAY;
            if (status & 0x00100000)
                btn |= BUTTON_MENU;
            semaphore_release(&button_init_wakeup);
        }
#endif

#ifdef CPU_PP    
    }
#endif

#ifdef HAVE_WHEEL_POSITION
    /* Save the new absolute wheel position */
    wheel_position = whl;
#endif
    return btn;
}

#ifdef HAVE_WHEEL_POSITION
int wheel_status(void)
{
    return wheel_position;
}
 
void wheel_send_events(bool send)
{
    send_events = send;
}
#endif

#ifdef CPU_PP
void ipod_4g_button_int(void)
{
    CPU_HI_INT_DIS = I2C_MASK;

    /* The following delay was 250 in the ipodlinux source, but 50 seems to 
       work fine - tested on Nano, Color/Photo and Video. */
    udelay(50);

    int_btn = ipod_4g_button_read();
    
    outl(inl(0x7000c104) | 0x0c000000, 0x7000c104);
    outl(0x400a1f00, 0x7000c100);

    CPU_HI_INT_EN = I2C_MASK;
}

void button_init_device(void)
{
    opto_i2c_init();

    /* fixes first button press being ignored */
#if defined(IPOD_4G) || defined(IPOD_COLOR)
    outl(inl(0x7000c100) & ~0x60000000, 0x7000c100);
    outl(inl(0x7000c104) | 0x04000000, 0x7000c104);
    outl(inl(0x7000c100) | 0x60000000, 0x7000c100);
#endif
    /* hold button - enable as input */
    GPIOA_ENABLE |= 0x20;
    GPIOA_OUTPUT_EN &= ~0x20; 
    
    /* unmask interrupt */
    CPU_INT_EN = HI_MASK;
    CPU_HI_INT_EN = I2C_MASK;
}

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

bool headphones_inserted(void)
{
    return (GPIOA_INPUT_VAL & 0x80)?true:false;
}
#else
void INT_WHEEL(void)
{
    int clickwheel_events = WHEELINT;

    /* Clear interrupts */
    if (clickwheel_events & 4) WHEELINT = 4;
    if (clickwheel_events & 2) WHEELINT = 2;
    if (clickwheel_events & 1) WHEELINT = 1;

    int_btn = ipod_4g_button_read();
}

static void s5l_clickwheel_init(void)
{
#if CONFIG_CPU==S5L8701
    PWRCONEXT &= ~1;
    PCON15 = (PCON15 & ~0xFFFF0000) | 0x22220000;
    PUNK15 = 0xF0;
    WHEEL08 = 0x3A980;
    WHEEL00 = 0x280000;
    WHEEL10 = 3;
    PCON10 = (PCON10 & ~0xFF0) | 0x10;
    PDAT10 |= 2;
    WHEELTX = 0x8000023A;
    WHEEL04 |= 1;
    PDAT10 &= ~2;
#elif CONFIG_CPU==S5L8702 || CONFIG_CPU==S5L8720
    clockgate_enable(CLOCKGATE_CWHEEL, true);
    PCON14 = (PCON14 & ~0x00ffff00) | 0x00222200;
    WHEEL00 = 0; /* stop s5l8702 controller */
    WHEELINT = 7;
    WHEEL10 = 1;
    WHEEL00 = 0x380000;
    WHEEL08 = 0x20000;
    WHEELTX = 0x8000023A;
    WHEEL04 |= 1;
#endif
}

void button_init_device(void)
{
    semaphore_init(&button_init_wakeup, 1, 0);
#if CONFIG_CPU==S5L8701
    INTMSK |= (1<<26);
#endif
    s5l_clickwheel_init();
    semaphore_wait(&button_init_wakeup, HZ / 10);
}

bool button_hold(void)
{
#if CONFIG_CPU==S5L8701
    bool value = (PDAT14 & (1 << 6)) == 0;
    if (value)
        PCON15 = PCON15 & ~0xffff0000;
    else PCON15 = (PCON15 & ~0xffff0000) | 0x22220000;
    return value;
#elif CONFIG_CPU==S5L8702 || CONFIG_CPU==S5L8720
    return pmu_holdswitch_locked();
#endif
}

bool headphones_inserted(void)
{
#if CONFIG_CPU==S5L8701
    return ((PDAT14 & (1 << 5)) != 0);
#elif CONFIG_CPU==S5L8702 || CONFIG_CPU==S5L8720
    return ((PDAT10 & (1 << 6)) != 0);
#endif
}
#endif

/*
 * 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)
    {
#ifndef BOOTLOADER
        backlight_hold_changed(hold_button);
#endif
        
        if (hold_button)
        {
#ifdef CPU_PP
            /* lock -> disable wheel sensor */
            DEV_EN &= ~DEV_OPTO;
#elif CONFIG_CPU==S5L8701
            /*pmu_ldo_power_off(1);*/ /* disable clickwheel power supply */
            WHEEL00 = 0;
            WHEEL10 = 0;
            PWRCONEXT |= 1;
#elif CONFIG_CPU==S5L8702 || CONFIG_CPU==S5L8720
            WHEEL00 = 0;
            PCON14 = (PCON14 & ~0x00ffff00) | 0x000e0e00;
            clockgate_enable(CLOCKGATE_CWHEEL, false);
#endif
        }
        else
        {
#ifdef CPU_PP
            /* unlock -> enable wheel sensor */
            DEV_EN |= DEV_OPTO;
            opto_i2c_init();
#elif CONFIG_CPU==S5L8701
            /*pmu_ldo_power_on(1);*/ /* enable clickwheel power supply */
            s5l_clickwheel_init();
#elif CONFIG_CPU==S5L8702 || CONFIG_CPU==S5L8720
            s5l_clickwheel_init();
#endif
        }
    }

    /* The int_btn variable is set in the button interrupt handler */
#ifdef IPOD_ACCESSORY_PROTOCOL
    return int_btn | remote_control_rx();
#else
    return int_btn;
#endif
}