arch/arm/mach-pxa/h5400/h5400_battery.c

   1 /*
   2  * Battery driver for iPAQ h5400
   3  *
   4  * Copyright 2005 Phil Blundell
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/tty.h>
  15 #include <linux/sched.h>
  16 #include <linux/delay.h>
  17 #include <linux/pm.h>
  18 #include <linux/err.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/platform_device.h>
  21
  22 #include <asm/mach-types.h>
  23 #include <asm/hardware.h>
  24 #include <asm/apm.h>
  25
  26 #include <asm/mach/arch.h>
  27
  28 #include <asm/arch/pxa-regs.h>
  29 #include <asm/arch/h5400-asic.h>
  30 #include <asm/arch/h5400-gpio.h>
  31
  32 #include <asm/hardware/samcop_base.h>
  33
  34 #define POWER_NONE      0
  35 #define POWER_AC        1
  36 #define POWER_USB       2
  37
  38 static int power_status;
  39
  40 static inline int
  41 h5400_power_status (void)
  42 {
  43         int val = samcop_get_gpio_a (&h5400_samcop.dev);
  44
  45         if (val & SAMCOP_GPIO_GPA_ADP_IN_STATUS)
  46                 return POWER_AC;
  47
  48         if (val & SAMCOP_GPIO_GPA_USB_DETECT)
  49                 return POWER_USB;
  50
  51         return POWER_NONE;
  52 }
  53
  54 static void
  55 h5400_apm_get_power_status (struct apm_power_info *info)
  56 {
  57         info->ac_line_status = (power_status != POWER_NONE) ? APM_AC_ONLINE : APM_AC_OFFLINE;
  58 }
  59
  60 static irqreturn_t
  61 h5400_ac_in_isr (int irq, void *dev_id, struct pt_regs *regs)
  62 {
  63         SET_H5400_GPIO (CHG_EN, 0);
  64         SET_H5400_GPIO (USB_CHG_RATE, 0);
  65         SET_H5400_GPIO (EXT_CHG_RATE, 0);
  66
  67         power_status = h5400_power_status ();
  68
  69         switch (power_status) {
  70         case POWER_AC:
  71                 printk (KERN_DEBUG "h5400_battery: charger on (AC)\n");
  72                 SET_H5400_GPIO (EXT_CHG_RATE, 1);
  73                 SET_H5400_GPIO (CHG_EN, 1);
  74                 break;
  75         case POWER_USB:
  76                 printk (KERN_DEBUG "h5400_battery: charger on (USB)\n");
  77                 SET_H5400_GPIO (USB_CHG_RATE, 1);
  78                 SET_H5400_GPIO (CHG_EN, 1);
  79                 break;
  80         case POWER_NONE:
  81                 printk (KERN_DEBUG "h5400_battery: charger off\n");
  82                 break;
  83         }
  84
  85         return IRQ_HANDLED;
  86 }
  87
  88 static int
  89 h5400_battery_init (void)
  90 {
  91         int result, irq_base;
  92
  93         if (! machine_is_h5400 ())
  94                 return -ENODEV;
  95
  96         irq_base = samcop_irq_base (&h5400_samcop.dev);
  97
  98         result = request_irq (irq_base + _IRQ_SAMCOP_WAKEUP2, h5400_ac_in_isr,
  99                               SA_INTERRUPT | SA_SAMPLE_RANDOM, "AC presence", NULL);
 100         if (result) {
 101                 printk (KERN_CRIT "%s: unable to grab AC in IRQ\n", __FUNCTION__);
 102                 return result;
 103         }
 104
 105         result = request_irq (irq_base + _IRQ_SAMCOP_WAKEUP3, h5400_ac_in_isr,
 106                               SA_INTERRUPT | SA_SAMPLE_RANDOM, "USB presence", NULL);
 107         if (result) {
 108                 printk (KERN_CRIT "%s: unable to grab AC in IRQ\n", __FUNCTION__);
 109                 return result;
 110         }
 111
 112         h5400_ac_in_isr (0, NULL, NULL);
 113
 114         apm_get_power_status = h5400_apm_get_power_status;
 115
 116         return 0;
 117 }
 118
 119 static void
 120 h5400_battery_exit (void)
 121 {
 122         int irq_base;
 123
 124         irq_base = samcop_irq_base (&h5400_samcop.dev);
 125
 126         free_irq (irq_base + _IRQ_SAMCOP_WAKEUP2, NULL);
 127         free_irq (irq_base + _IRQ_SAMCOP_WAKEUP3, NULL);
 128         apm_get_power_status = NULL;
 129 }
 130
 131 module_init (h5400_battery_init)
 132 module_exit (h5400_battery_exit)