arch/arm/mach-pxa/himalaya/himalaya_battery.c

   1 /*
   2 * Driver interface to the battery on the HTC Himalaya
   3 *
   4 * Use consistent with the GNU GPL is permitted,
   5 * provided that this copyright notice is
   6 * preserved in its entirety in all copies and derived works.
   7 *
   8 */
   9
  10 #include <linux/module.h>
  11 #include <linux/version.h>
  12 #include <linux/config.h>
  13
  14 #include <asm/arch/hardware.h>
  15 #include <asm/arch/pxa-regs.h>
  16 #include <linux/battery.h>
  17
  18 #include "tsc2200.h"
  19 #include "pxa_nssp.h"
  20
  21 static void bat_tsc2200_start_conv_ps(void)
  22 {
  23         tsc2200_write(TSC2200_CTRLREG_REF, 31);
  24         tsc2200_write(TSC2200_CTRLREG_ADC,
  25                 TSC2200_CTRLREG_ADC_AD3 |
  26                 TSC2200_CTRLREG_ADC_AD1 |
  27                 TSC2200_CTRLREG_ADC_AD0 |
  28                 TSC2200_CTRLREG_ADC_RES (TSC2200_CTRLREG_ADC_RES_12BITP) |
  29                 TSC2200_CTRLREG_ADC_AVG (TSC2200_CTRLREG_ADC_8AVG) |
  30                 TSC2200_CTRLREG_ADC_CL  (TSC2200_CTRLREG_ADC_CL_2MHZ_12BIT) |
  31                 TSC2200_CTRLREG_ADC_PV  (TSC2200_CTRLREG_ADC_PV_500uS) );
  32 }
  33
  34 static void bat_tsc2200_start_conv_temp(void)
  35 {
  36         tsc2200_write(TSC2200_CTRLREG_ADC,
  37                 TSC2200_CTRLREG_ADC_AD3 |
  38                 TSC2200_CTRLREG_ADC_AD1 |
  39                 TSC2200_CTRLREG_ADC_RES (TSC2200_CTRLREG_ADC_RES_12BITP) |
  40                 TSC2200_CTRLREG_ADC_AVG (TSC2200_CTRLREG_ADC_8AVG) |
  41                 TSC2200_CTRLREG_ADC_CL  (TSC2200_CTRLREG_ADC_CL_2MHZ_12BIT) |
  42                 TSC2200_CTRLREG_ADC_PV  (TSC2200_CTRLREG_ADC_PV_500uS) );
  43 }
  44
  45 static int himalaya_battery_get_status(struct battery *bat)
  46 {
  47         printk("%s: in.\n", __FUNCTION__);
  48
  49         if ( GPLR(63) & GPIO_bit(63) ) {
  50                 return BATTERY_STATUS_CHARGING;
  51         } else {
  52                 return BATTERY_STATUS_NOT_CHARGING;
  53         }
  54 }
  55
  56 static int himalaya_battery_get_voltage(struct battery *bat)
  57 {
  58         int retval;
  59
  60         printk("%s: in.\n", __FUNCTION__);
  61
  62         down_interruptible(&tsc2200_sem);
  63         bat_tsc2200_start_conv_ps();
  64
  65         while ( !(tsc2200_read(TSC2200_CTRLREG_ADC) & 0x4000) &&
  66                          !tsc2200_dav()) {
  67                 printk("1: %X\n", tsc2200_read(TSC2200_CTRLREG_ADC));
  68                 msleep(1);
  69         }
  70
  71         retval = tsc2200_read(TSC2200_DATAREG_BAT1);
  72         printk("%s: BAT1: %03X\nBAT2: %03x\nAUX1: %03x\nAUX2: %03x\nTEMP1: %03x\nTEMP2: %03x\n", __FUNCTION__, tsc2200_read(TSC2200_DATAREG_BAT1), tsc2200_read(TSC2200_DATAREG_BAT2), tsc2200_read(TSC2200_DATAREG_AUX1), tsc2200_read(TSC2200_DATAREG_AUX2), tsc2200_read(TSC2200_DATAREG_TEMP1), tsc2200_read(TSC2200_DATAREG_TEMP2));
  73
  74         up(&tsc2200_sem);
  75         return retval;
  76 }
  77
  78 static int himalaya_battery_get_temp(struct battery *bat)
  79 {
  80         int retval;
  81
  82         printk("%s: in.\n", __FUNCTION__);
  83
  84         down_interruptible(&tsc2200_sem);
  85         bat_tsc2200_start_conv_temp();
  86
  87         while ( !(tsc2200_read(TSC2200_CTRLREG_ADC) & 0x4000) &&
  88                          !tsc2200_dav()) {
  89                 printk("1: %X\n", tsc2200_read(TSC2200_CTRLREG_ADC));
  90                 msleep(1);
  91         }
  92
  93         retval = tsc2200_read(TSC2200_DATAREG_TEMP1);
  94
  95         up(&tsc2200_sem);
  96         return retval;
  97 }
  98
  99 struct battery battery_dev = {
 100         .name           = "main battery",
 101         .id             = "battery0",
 102         .get_voltage    = himalaya_battery_get_voltage,
 103         .get_status     = himalaya_battery_get_status,
 104         .get_temp       = himalaya_battery_get_temp,
 105 };
 106
 107 static struct device bat_tsc2200_dev = {
 108         .parent         = &nssp_bus,
 109         .bus            = &nssp_bus_type,
 110         .bus_id         = "bat_tsc2200",
 111 };
 112
 113 static int bat_setup(void)
 114 {
 115         device_register(&bat_tsc2200_dev);
 116         battery_class_register(&battery_dev);
 117
 118         return 0;
 119 }
 120
 121 static int __init bat_init(void)
 122 {
 123         bat_setup();
 124
 125         return 0;
 126 }
 127
 128 static void __exit bat_exit(void)
 129 {
 130         battery_class_unregister(&battery_dev);
 131         device_unregister(&bat_tsc2200_dev);
 132 }
 133
 134 module_init(bat_init)
 135 module_exit(bat_exit)
 136
 137 MODULE_AUTHOR("Matthias Burghardt");
 138 MODULE_DESCRIPTION("Battery (TI TSC2200) support for the HTC Himalaya");
 139