firmware/target/arm/imx233/creative-zenxfi3/button-zenxfi3.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2012 by Amaury Pouly
  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 #include "button-target.h"
  22 #include "system.h"
  23 #include "system-target.h"
  24 #include "pinctrl-imx233.h"
  25 #include "power-imx233.h"
  26 #include "string.h"
  27 #include "usb.h"
  28 #include "backlight.h"
  29 #include "mpr121.h"
  30
  31 static struct mpr121_config_t config =
  32 {
  33     .ele =
  34     {
  35         [0] = {.tth = 5, .rth = 4 },
  36         [1] = {.tth = 5, .rth = 4 },
  37         [2] = {.tth = 5, .rth = 4 },
  38         [3] = {.tth = 5, .rth = 4 },
  39         [4] = {.tth = 4, .rth = 3 },
  40         [5] = {.tth = 4, .rth = 3 },
  41         [6] = {.tth = 5, .rth = 4 },
  42         [7] = {.tth = 5, .rth = 4 },
  43         [8] = {.gpio = ELE_GPIO_OUTPUT_OPEN_LED },
  44     },
  45     .filters =
  46     {
  47         .ele =
  48         {
  49             .rising = {.mhd = 1, .nhd = 1, .ncl = 1, .fdl = 1 },
  50             .falling = {.mhd = 1, .nhd = 1, .ncl = 0xff, .fdl = 2 },
  51         }
  52     },
  53     .autoconf =
  54     {
  55         .en = true, .ren = true, .retry = RETRY_NEVER,
  56         .usl = 0xc4, .lsl = 0x7f, .tl = 0xb0
  57     },
  58     .ele_en = ELE_EN0_x(7),
  59     .cal_lock = CL_TRACK
  60 };
  61
  62 #define MPR121_INTERRUPT    1
  63
  64 static int touchpad_btns = 0;
  65 static long mpr121_stack[DEFAULT_STACK_SIZE/sizeof(long)];
  66 static const char mpr121_thread_name[] = "mpr121";
  67 static struct event_queue mpr121_queue;
  68
  69 static void mpr121_irq_cb(int bank, int pin)
  70 {
  71     (void) bank;
  72     (void) pin;
  73     /* the callback will not be fired until interrupt is enabled back so
  74      * the queue will not overflow or contain multiple MPR121_INTERRUPT events */
  75     queue_post(&mpr121_queue, MPR121_INTERRUPT, 0);
  76 }
  77
  78 static void mpr121_thread(void)
  79 {
  80     struct queue_event ev;
  81
  82     while(1)
  83     {
  84         queue_wait(&mpr121_queue, &ev);
  85         /* handle usb connect and ignore all messages except rmi interrupts */
  86         if(ev.id == SYS_USB_CONNECTED)
  87         {
  88             usb_acknowledge(SYS_USB_CONNECTED_ACK);
  89             continue;
  90         }
  91         else if(ev.id != MPR121_INTERRUPT)
  92             continue;
  93         /* clear interrupt and get status */
  94         unsigned status;
  95         touchpad_btns = 0;
  96         if(!mpr121_get_touch_status(&status))
  97         {
  98             /* ELE3: up
  99              * ELE4: back
 100              * ELE5: menu
 101              * ELE6: down
 102              * ELE7: play */
 103             if(status & 0x8) touchpad_btns |= BUTTON_UP;
 104             if(status & 0x10) touchpad_btns |= BUTTON_BACK;
 105             if(status & 0x20) touchpad_btns |= BUTTON_MENU;
 106             if(status & 0x40) touchpad_btns |= BUTTON_DOWN;
 107             if(status & 0x80) touchpad_btns |= BUTTON_PLAY;
 108         }
 109         /* enable interrupt */
 110         imx233_setup_pin_irq(0, 18, true, true, false, &mpr121_irq_cb);
 111     }
 112 }
 113
 114 /* B0P18 is #IRQ line of the touchpad */
 115 void button_init_device(void)
 116 {
 117     mpr121_init(0xb4);
 118     mpr121_soft_reset();
 119     mpr121_set_config(&config);
 120
 121     queue_init(&mpr121_queue, true);
 122     create_thread(mpr121_thread, mpr121_stack, sizeof(mpr121_stack), 0,
 123         mpr121_thread_name IF_PRIO(, PRIORITY_USER_INTERFACE) IF_COP(, CPU));
 124     /* enable interrupt */
 125     imx233_set_pin_function(0, 18, PINCTRL_FUNCTION_GPIO);
 126     imx233_enable_gpio_output(0, 18, false);
 127     imx233_setup_pin_irq(0, 18, true, true, false, &mpr121_irq_cb);
 128 }
 129
 130 bool button_hold(void)
 131 {
 132     /* B0P04: #hold */
 133     return !imx233_get_gpio_input_mask(0, 0x10);
 134 }
 135
 136 int button_read_device(void)
 137 {
 138     /* since sliding hold will usually trigger power, ignore power button
 139      * for one second after hold is released */
 140     static int power_ignore_counter = 0;
 141     static bool old_hold;
 142     /* light handling */
 143     bool hold = button_hold();
 144     if(hold != old_hold)
 145     {
 146         old_hold = hold;
 147 #ifndef BOOTLOADER
 148         backlight_hold_changed(hold);
 149 #endif /* BOOTLOADER */
 150         if(!hold)
 151             power_ignore_counter = HZ;
 152     }
 153
 154     if(power_ignore_counter)
 155         power_ignore_counter--;
 156
 157     int res = 0;
 158     /* B2P07: #volume-
 159      * B2P08: #volume+
 160      * PSWITCH: power */
 161     uint32_t mask = imx233_get_gpio_input_mask(2, 0x180);
 162     if(!(mask & 0x80))
 163         res |= BUTTON_VOL_DOWN;
 164     if(!(mask & 0x100))
 165         res |= BUTTON_VOL_UP;
 166     /* WARNING: it seems that the voltage on PSWITCH depends on whether
 167      * usb is connected or not ! Thus the value of this field can be 1 or 3 */
 168     if(__XTRACT(HW_POWER_STS, PSWITCH) != 0 && power_ignore_counter == 0)
 169         res |= BUTTON_POWER;
 170     return res | touchpad_btns;
 171 }