arch/arm/mach-pxa/h3900/h3900_battery.c

   1 /*
   2  * Battery driver for iPAQ h3900
   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 #include <asm/arch/pxa-regs.h>
  26
  27 #include <asm/mach/arch.h>
  28 #include <asm/arch/h3900-asic.h>
  29 #include <asm/arch/h3900-gpio.h>
  30
  31 #include <linux/soc/asic3_base.h>
  32
  33 static int ac_in;
  34
  35 static int
  36 h3900_ac_power (void)
  37 {
  38         return (GPLR0 & GPIO_H3900_AC_IN_N) ? 0 : 1;
  39 }
  40
  41 static void
  42 h3900_apm_get_power_status (struct apm_power_info *info)
  43 {
  44         info->ac_line_status = ac_in ? APM_AC_ONLINE : APM_AC_OFFLINE;
  45 }
  46
  47 static irqreturn_t
  48 h3900_ac_in_isr (int irq, void *dev_id, struct pt_regs *regs)
  49 {
  50         ac_in = h3900_ac_power ();
  51
  52         return IRQ_HANDLED;
  53 }
  54
  55 static int
  56 h3900_battery_init (void)
  57 {
  58         int result;
  59
  60         asic3_set_gpio_out_b(&h3900_asic3.dev,
  61                                    GPIO3_CH_TIMER, GPIO3_CH_TIMER);
  62
  63         result = request_irq (IRQ_GPIO (GPIO_NR_H3900_AC_IN_N), h3900_ac_in_isr,
  64                               SA_INTERRUPT | SA_SAMPLE_RANDOM, "AC presence", NULL);
  65         if (result) {
  66                 printk (KERN_CRIT "%s: unable to grab AC in IRQ\n", __FUNCTION__);
  67                 return result;
  68         }
  69
  70         apm_get_power_status = h3900_apm_get_power_status;
  71
  72         return 0;
  73 }
  74
  75 static void
  76 h3900_battery_exit (void)
  77 {
  78         free_irq (IRQ_GPIO (GPIO_NR_H3900_AC_IN_N), NULL);
  79         apm_get_power_status = NULL;
  80 }
  81
  82 module_init (h3900_battery_init)
  83 module_exit (h3900_battery_exit)