firmware/target/arm/as3525/sansa-fuzev2/button-fuzev2.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 by Thomas Martitz
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "button.h"
  25 #include "backlight.h"
  26
  27 #ifdef HAS_BUTTON_HOLD
  28 static bool hold_button = false;
  29 #endif
  30
  31 #ifdef HAVE_SCROLLWHEEL
  32 #define SCROLLWHEEL_BITS        (1<<7|1<<6)
  33                                                       /* TIMER units */
  34 #define TIMER_TICK              (KERNEL_TIMER_FREQ/HZ)/* how long a tick lasts */
  35 #define TIMER_MS                (TIMER_TICK/(1000/HZ))/* how long a ms lasts */
  36
  37 #define WHEEL_REPEAT_INTERVAL   (300*TIMER_MS)      /* 300ms */
  38 #define WHEEL_FAST_ON_INTERVAL  ( 20*TIMER_MS)      /*  20ms */
  39 #define WHEEL_FAST_OFF_INTERVAL ( 60*TIMER_MS)      /*  60ms */
  40 /* phsyical clicks per rotation * wheel value changes per phys click */
  41 #define WHEEL_CHANGES_PER_CLICK         4
  42 #define WHEELCLICKS_PER_ROTATION        (12*WHEEL_CHANGES_PER_CLICK)
  43
  44 /*
  45  * based on button-e200.c, adjusted to the AMS timers and fuzev2's
  46  * scrollwheel and cleaned up a little
  47  */
  48 static void scrollwheel(unsigned int wheel_value)
  49 {
  50     /* wheel values and times from the previous irq */
  51     static unsigned int  old_wheel_value   = 0;
  52     static unsigned int  wheel_repeat      = BUTTON_NONE;
  53     static          long last_wheel_post   = 0;
  54
  55     /* We only post every 4th action, as this matches better with the physical
  56      * clicks of the wheel */
  57     static unsigned int  wheel_click_count = 0;
  58     /* number of items to skip in lists, 1 in slow mode */
  59     static unsigned int  wheel_delta       = 0;
  60     /* accumulated wheel rotations per second */
  61     static unsigned long wheel_velocity    = 0;
  62     /* fast or slow mode? */
  63     static          int  wheel_fast_mode   = 0;
  64
  65     /* Read wheel
  66      * Bits 6 and 7 of GPIOA change as follows (Gray Code):
  67      * Clockwise rotation   00 -> 01 -> 11 -> 10 -> 00
  68      * Counter-clockwise    00 -> 10 -> 11 -> 01 -> 00
  69      *
  70      * For easy look-up, actual wheel values act as indicies also,
  71      * which is why the table seems to be not ordered correctly
  72      */
  73     static const unsigned char wheel_tbl[2][4] =
  74     {
  75         { 2, 0, 3, 1 }, /* Clockwise rotation */
  76         { 1, 3, 0, 2 }, /* Counter-clockwise  */
  77     };
  78
  79     unsigned int btn = BUTTON_NONE;
  80
  81     if (old_wheel_value == wheel_tbl[0][wheel_value])
  82         btn = BUTTON_SCROLL_FWD;
  83     else if (old_wheel_value == wheel_tbl[1][wheel_value])
  84         btn = BUTTON_SCROLL_BACK;
  85
  86     if (btn == BUTTON_NONE)
  87     {
  88         old_wheel_value = wheel_value;
  89         return;
  90     }
  91
  92     int  repeat = 1; /* assume repeat */
  93     long time = (TIMER_TICK - TIMER2_VALUE) + current_tick*TIMER_TICK; /* to timer unit */
  94     long v = (time - last_wheel_post);
  95
  96    /* interpolate velocity in timer_freq/timer_unit == 1/s */
  97     if (v) v = TIMER_FREQ / v;
  98
  99     /* accumulate velocities over time with each v */
 100     wheel_velocity = (7*wheel_velocity + v) / 8;
 101
 102     if (btn != wheel_repeat)
 103     {
 104         /* direction reversals nullify all fast mode states */
 105         wheel_repeat      = btn;
 106         repeat            =
 107         wheel_velocity    =
 108         wheel_click_count = 0;
 109     }
 110
 111     if (wheel_fast_mode != 0)
 112     {
 113         /* fast OFF happens immediately when velocity drops below
 114            threshold */
 115         if (TIME_AFTER(time,
 116                 last_wheel_post + WHEEL_FAST_OFF_INTERVAL))
 117         {
 118             /* moving out of fast mode */
 119             wheel_fast_mode = 0;
 120             /* reset velocity */
 121             wheel_velocity = 0;
 122             /* wheel_delta is always 1 in slow mode */
 123             wheel_delta = 1;
 124         }
 125     }
 126     else
 127     {
 128         /* fast ON gets filtered to avoid inadvertent jumps to fast mode */
 129         if (repeat && wheel_velocity > TIMER_FREQ/WHEEL_FAST_ON_INTERVAL)
 130         {
 131             /* moving into fast mode */
 132             wheel_fast_mode = 1 << 31;
 133             wheel_click_count = 0;
 134             wheel_velocity = TIMER_FREQ/WHEEL_FAST_OFF_INTERVAL;
 135         }
 136         else if (++wheel_click_count < WHEEL_CHANGES_PER_CLICK)
 137         {   /* skip some wheel changes, so that 1 post represents
 138              * 1 item in lists */
 139             btn = BUTTON_NONE;
 140         }
 141
 142         /* wheel_delta is always 1 in slow mode */
 143         wheel_delta = 1;
 144     }
 145
 146     if (btn != BUTTON_NONE)
 147     {
 148         wheel_click_count = 0;
 149
 150         /* generate repeats if quick enough */
 151         if (repeat && TIME_BEFORE(time,
 152                 last_wheel_post + WHEEL_REPEAT_INTERVAL))
 153             btn |= BUTTON_REPEAT;
 154
 155         last_wheel_post = time;
 156
 157         if (queue_empty(&button_queue))
 158         {
 159             queue_post(&button_queue, btn, wheel_fast_mode |
 160                    (wheel_delta << 24) | wheel_velocity*360/WHEELCLICKS_PER_ROTATION);
 161             /* message posted - reset delta and poke backlight on*/
 162             wheel_delta = 1;
 163             backlight_on();
 164             buttonlight_on();
 165         }
 166         else
 167         {
 168             /* skipped post - increment delta */
 169             if (++wheel_delta > 0x7f)
 170                 wheel_delta = 0x7f;
 171         }
 172     }
 173
 174     old_wheel_value = wheel_value;
 175 }
 176 #endif
 177
 178 void button_init_device(void)
 179 {
 180 #if defined(HAVE_SCROLLWHEEL)
 181     GPIOA_DIR &= ~(1<<6|1<<7);
 182     GPIOC_DIR = 0;
 183     GPIOB_DIR |= (1<<4)|(1<<0);
 184
 185     GPIOB_PIN(4) = 1<<4; /* activate the wheel */
 186
 187     /* setup scrollwheel isr */
 188     /* clear previous irq if any */
 189     GPIOA_IC = SCROLLWHEEL_BITS;
 190     /* enable edge detecting */
 191     GPIOA_IS &= ~SCROLLWHEEL_BITS;
 192     /* detect both raising and falling edges */
 193     GPIOA_IBE |= SCROLLWHEEL_BITS;
 194     /* lastly, enable the interrupt */
 195     GPIOA_IE |= SCROLLWHEEL_BITS;
 196 #endif
 197 }
 198
 199     /* read the 2 bits at the same time */
 200 #define GPIOA_PIN76_offset ((1<<(6+2)) | (1<<(7+2)))
 201 #define GPIOA_PIN76 (*(volatile unsigned char*)(GPIOA_BASE+GPIOA_PIN76_offset))
 202
 203 void button_gpioa_isr(void)
 204 {
 205 #if defined(HAVE_SCROLLWHEEL)
 206     /* scroll wheel handling */
 207     if (GPIOA_MIS & SCROLLWHEEL_BITS)
 208         scrollwheel(GPIOA_PIN76 >> 6);
 209
 210     /* ack interrupt */
 211     GPIOA_IC = SCROLLWHEEL_BITS;
 212 #endif
 213 }
 214
 215
 216 /*
 217  * Get button pressed from hardware
 218  */
 219 int button_read_device(void)
 220 {
 221     int btn = 0;
 222     static bool hold_button_old = false;
 223     static long power_counter = 0;
 224     unsigned gpiod6;
 225
 226     /* if we don't wait for the fifo to empty, we'll see screen corruption
 227      * (the higher the CPU frequency the higher the corruption) */
 228     while ((DBOP_STAT & (1<<10)) == 0);
 229
 230     int delay = 30;
 231     while(delay--) nop;
 232
 233     bool ccu_io_bit12 = CCU_IO & (1<<12);
 234     CCU_IO &= ~(1<<12);
 235
 236     /* B1 is shared with FM i2c */
 237     bool gpiob_pin0_dir = GPIOB_DIR & (1<<1);
 238     GPIOB_DIR &= ~(1<<1);
 239
 240     GPIOB_PIN(0) = 1<<0;
 241     udelay(4);
 242
 243     gpiod6 = GPIOD_PIN(6);
 244
 245     GPIOB_PIN(0) = 0;
 246     udelay(2);
 247
 248     if (GPIOC_PIN(1) & 1<<1)
 249         btn |= BUTTON_DOWN;
 250     if (GPIOC_PIN(2) & 1<<2)
 251         btn |= BUTTON_UP;
 252     if (GPIOC_PIN(3) & 1<<3)
 253         btn |= BUTTON_LEFT;
 254     if (GPIOC_PIN(4) & 1<<4)
 255         btn |= BUTTON_SELECT;
 256     if (GPIOC_PIN(5) & 1<<5)
 257         btn |= BUTTON_RIGHT;
 258     if (GPIOB_PIN(1) & 1<<1)
 259         btn |= BUTTON_HOME;
 260     if (gpiod6 & 1<<6)
 261     {   /* power/hold is on the same pin. we know it's hold if the bit isn't
 262          * set now anymore */
 263         if (GPIOD_PIN(6) & 1<<6)
 264         {
 265             hold_button = false;
 266             btn |= BUTTON_POWER;
 267         }
 268         else
 269         {
 270             hold_button = true;
 271         }
 272     }
 273
 274     if(gpiob_pin0_dir)
 275         GPIOB_DIR |= 1<<1;
 276
 277     if(ccu_io_bit12)
 278         CCU_IO |= 1<<12;
 279
 280 #ifdef HAS_BUTTON_HOLD
 281 #ifndef BOOTLOADER
 282     /* light handling */
 283     if (hold_button != hold_button_old)
 284     {
 285         hold_button_old = hold_button;
 286         backlight_hold_changed(hold_button);
 287         /* mask scrollwheel irq so we don't need to check for
 288          * the hold button in the isr */
 289         if (hold_button)
 290             GPIOA_IE &= ~SCROLLWHEEL_BITS;
 291         else
 292             GPIOA_IE |= SCROLLWHEEL_BITS;
 293     }
 294 #else
 295     (void)hold_button_old;
 296 #endif
 297     if (hold_button)
 298     {
 299         power_counter = HZ;
 300         return 0;
 301     }
 302     /* read power, but not if hold button was just released, since
 303      * you basically always hit power due to the slider mechanism after releasing
 304      * (fuze only)
 305      */
 306     else if (power_counter > 0)
 307     {
 308         power_counter--;
 309         btn &= ~BUTTON_POWER;
 310     }
 311 #endif
 312     return btn;
 313 }
 314
 315 #ifdef HAS_BUTTON_HOLD
 316 bool button_hold(void)
 317 {
 318     return hold_button;
 319 }
 320 #endif