firmware/target/arm/imx31/gigabeat-s/power-gigabeat-s.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 by Linus Nielsen Feltzing
  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 "config.h"
  22 #include "system.h"
  23 #include "usb.h"
  24 #include "usb_core.h"
  25 #include "power.h"
  26 #include "power-gigabeat-s.h"
  27 #include "backlight.h"
  28 #include "backlight-target.h"
  29 #include "avic-imx31.h"
  30 #include "mc13783.h"
  31 #include "dvfs_dptc-imx31.h"
  32 #if CONFIG_TUNER
  33 #include "fmradio_i2c.h"
  34 #endif
  35
  36 static unsigned int power_status = POWER_INPUT_NONE;
  37
  38 /* Detect which power sources are present. */
  39 unsigned int power_input_status(void)
  40 {
  41     unsigned int status = power_status;
  42
  43     if (GPIO3_DR & (1 << 20))
  44         status |= POWER_INPUT_BATTERY;
  45
  46     if (usb_allowed_current() < 500)
  47     {
  48         /* ACK that USB is connected but NOT chargeable */
  49         status &= ~(POWER_INPUT_USB_CHARGER & POWER_INPUT_CHARGER);
  50     }
  51
  52     return status;
  53 }
  54
  55 /* Detect changes in presence of the AC adaptor. */
  56 void charger_main_detect_event(void)
  57 {
  58     if (mc13783_read(MC13783_INTERRUPT_SENSE0) & MC13783_SE1S)
  59         power_status |= POWER_INPUT_MAIN_CHARGER;
  60     else
  61         power_status &= ~POWER_INPUT_MAIN_CHARGER;
  62 }
  63
  64 /* Detect changes in USB bus power. Called from usb connect event handler. */
  65 void charger_usb_detect_event(int status)
  66 {
  67     /* USB plugged does not imply charging is possible or even
  68      * powering the device to maintain the battery. */
  69     if (status == USB_INSERTED)
  70         power_status |= POWER_INPUT_USB_CHARGER;
  71     else
  72         power_status &= ~POWER_INPUT_USB_CHARGER;
  73 }
  74
  75 /* charging_state is implemented in powermgmt-imx31.c */
  76
  77 void ide_power_enable(bool on)
  78 {
  79     if (!on)
  80     {
  81         /* Bus must be isolated before power off */
  82         imx31_regset32(&GPIO2_DR, (1 << 16));
  83     }
  84
  85     /* HD power switch */
  86     imx31_regmod32(&GPIO3_DR, on ? (1 << 5) : 0, (1 << 5));
  87
  88     if (on)
  89     {
  90         /* Bus switch may be turned on after powerup */
  91         sleep(HZ/10);
  92         imx31_regclr32(&GPIO2_DR, (1 << 16));
  93     }
  94 }
  95
  96 bool ide_powered(void)
  97 {
  98     return (GPIO3_DR & (1 << 5)) != 0;
  99 }
 100
 101 #if CONFIG_TUNER
 102 static bool tuner_on = false;
 103
 104 bool tuner_power(bool status)
 105 {
 106     if (status != tuner_on)
 107     {
 108         tuner_on = status;
 109         /* Handle power and pin setup */
 110         fmradio_i2c_enable(status);
 111         status = !status;
 112     }
 113
 114     return status;
 115 }
 116
 117 bool tuner_powered(void)
 118 {
 119     return tuner_on;
 120 }
 121 #endif /* #if CONFIG_TUNER */
 122
 123 void power_off(void)
 124 {
 125     /* Turn off voltage and frequency scaling */
 126     dvfs_dptc_stop();
 127
 128     /* Cut backlight */
 129     _backlight_off();
 130
 131     /* Let it fade */
 132     sleep(5*HZ/4);
 133
 134     /* Set user off mode */
 135     mc13783_set(MC13783_POWER_CONTROL0, MC13783_USEROFFSPI);
 136
 137     /* Wait for power cut */
 138     system_halt();
 139 }
 140
 141 void power_init(void)
 142 {
 143 #if CONFIG_TUNER
 144     fmradio_i2c_init();
 145 #endif
 146
 147     /* Poll initial state */
 148     charger_main_detect_event();
 149
 150     /* Enable detect event */
 151     mc13783_enable_event(MC13783_SE1_EVENT);
 152 }