arch/arm/mach-pxa/corgi_pm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Battery and Power Management code for the Sharp SL-C7xx
   4  *
   5  * Copyright (c) 2005 Richard Purdie
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/stat.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/delay.h>
  13 #include <linux/gpio.h>
  14 #include <linux/gpio-pxa.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/apm-emulation.h>
  18 #include <linux/io.h>
  19
  20 #include <asm/irq.h>
  21 #include <asm/mach-types.h>
  22
  23 #include "corgi.h"
  24 #include "pxa2xx-regs.h"
  25 #include "sharpsl_pm.h"
  26
  27 #include "generic.h"
  28
  29 #define SHARPSL_CHARGE_ON_VOLT         0x99  /* 2.9V */
  30 #define SHARPSL_CHARGE_ON_TEMP         0xe0  /* 2.9V */
  31 #define SHARPSL_CHARGE_ON_ACIN_HIGH    0x9b  /* 6V */
  32 #define SHARPSL_CHARGE_ON_ACIN_LOW     0x34  /* 2V */
  33 #define SHARPSL_FATAL_ACIN_VOLT        182   /* 3.45V */
  34 #define SHARPSL_FATAL_NOACIN_VOLT      170   /* 3.40V */
  35
  36 static struct gpio charger_gpios[] = {
  37         { CORGI_GPIO_ADC_TEMP_ON, GPIOF_OUT_INIT_LOW, "ADC Temp On" },
  38         { CORGI_GPIO_CHRG_ON,     GPIOF_OUT_INIT_LOW, "Charger On" },
  39         { CORGI_GPIO_CHRG_UKN,    GPIOF_OUT_INIT_LOW, "Charger Unknown" },
  40         { CORGI_GPIO_AC_IN,       GPIOF_IN, "Charger Detection" },
  41         { CORGI_GPIO_KEY_INT,     GPIOF_IN, "Key Interrupt" },
  42         { CORGI_GPIO_WAKEUP,      GPIOF_IN, "System wakeup notification" },
  43 };
  44
  45 static void corgi_charger_init(void)
  46 {
  47         gpio_request_array(ARRAY_AND_SIZE(charger_gpios));
  48 }
  49
  50 static void corgi_measure_temp(int on)
  51 {
  52         gpio_set_value(CORGI_GPIO_ADC_TEMP_ON, on);
  53 }
  54
  55 static void corgi_charge(int on)
  56 {
  57         if (on) {
  58                 if (machine_is_corgi() && (sharpsl_pm.flags & SHARPSL_SUSPENDED)) {
  59                         gpio_set_value(CORGI_GPIO_CHRG_ON, 0);
  60                         gpio_set_value(CORGI_GPIO_CHRG_UKN, 1);
  61                 } else {
  62                         gpio_set_value(CORGI_GPIO_CHRG_ON, 1);
  63                         gpio_set_value(CORGI_GPIO_CHRG_UKN, 0);
  64                 }
  65         } else {
  66                 gpio_set_value(CORGI_GPIO_CHRG_ON, 0);
  67                 gpio_set_value(CORGI_GPIO_CHRG_UKN, 0);
  68         }
  69 }
  70
  71 static void corgi_discharge(int on)
  72 {
  73         gpio_set_value(CORGI_GPIO_DISCHARGE_ON, on);
  74 }
  75
  76 static void corgi_presuspend(void)
  77 {
  78 }
  79
  80 static void corgi_postsuspend(void)
  81 {
  82 }
  83
  84 /*
  85  * Check what brought us out of the suspend.
  86  * Return: 0 to sleep, otherwise wake
  87  */
  88 static int corgi_should_wakeup(unsigned int resume_on_alarm)
  89 {
  90         int is_resume = 0;
  91
  92         dev_dbg(sharpsl_pm.dev, "PEDR = %x, GPIO_AC_IN = %d, "
  93                 "GPIO_CHRG_FULL = %d, GPIO_KEY_INT = %d, GPIO_WAKEUP = %d\n",
  94                 PEDR, gpio_get_value(CORGI_GPIO_AC_IN),
  95                 gpio_get_value(CORGI_GPIO_CHRG_FULL),
  96                 gpio_get_value(CORGI_GPIO_KEY_INT),
  97                 gpio_get_value(CORGI_GPIO_WAKEUP));
  98
  99         if ((PEDR & GPIO_bit(CORGI_GPIO_AC_IN))) {
 100                 if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
 101                         /* charge on */
 102                         dev_dbg(sharpsl_pm.dev, "ac insert\n");
 103                         sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
 104                 } else {
 105                         /* charge off */
 106                         dev_dbg(sharpsl_pm.dev, "ac remove\n");
 107                         sharpsl_pm_led(SHARPSL_LED_OFF);
 108                         sharpsl_pm.machinfo->charge(0);
 109                         sharpsl_pm.charge_mode = CHRG_OFF;
 110                 }
 111         }
 112
 113         if ((PEDR & GPIO_bit(CORGI_GPIO_CHRG_FULL)))
 114                 dev_dbg(sharpsl_pm.dev, "Charge full interrupt\n");
 115
 116         if (PEDR & GPIO_bit(CORGI_GPIO_KEY_INT))
 117                 is_resume |= GPIO_bit(CORGI_GPIO_KEY_INT);
 118
 119         if (PEDR & GPIO_bit(CORGI_GPIO_WAKEUP))
 120                 is_resume |= GPIO_bit(CORGI_GPIO_WAKEUP);
 121
 122         if (resume_on_alarm && (PEDR & PWER_RTC))
 123                 is_resume |= PWER_RTC;
 124
 125         dev_dbg(sharpsl_pm.dev, "is_resume: %x\n",is_resume);
 126         return is_resume;
 127 }
 128
 129 static bool corgi_charger_wakeup(void)
 130 {
 131         return !gpio_get_value(CORGI_GPIO_AC_IN) ||
 132                 !gpio_get_value(CORGI_GPIO_KEY_INT) ||
 133                 !gpio_get_value(CORGI_GPIO_WAKEUP);
 134 }
 135
 136 unsigned long corgipm_read_devdata(int type)
 137 {
 138         switch(type) {
 139         case SHARPSL_STATUS_ACIN:
 140                 return !gpio_get_value(CORGI_GPIO_AC_IN);
 141         case SHARPSL_STATUS_LOCK:
 142                 return gpio_get_value(sharpsl_pm.machinfo->gpio_batlock);
 143         case SHARPSL_STATUS_CHRGFULL:
 144                 return gpio_get_value(sharpsl_pm.machinfo->gpio_batfull);
 145         case SHARPSL_STATUS_FATAL:
 146                 return gpio_get_value(sharpsl_pm.machinfo->gpio_fatal);
 147         case SHARPSL_ACIN_VOLT:
 148                 return sharpsl_pm_pxa_read_max1111(MAX1111_ACIN_VOLT);
 149         case SHARPSL_BATT_TEMP:
 150                 return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_TEMP);
 151         case SHARPSL_BATT_VOLT:
 152         default:
 153                 return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_VOLT);
 154         }
 155 }
 156
 157 static struct sharpsl_charger_machinfo corgi_pm_machinfo = {
 158         .init            = corgi_charger_init,
 159         .exit            = NULL,
 160         .gpio_batlock    = CORGI_GPIO_BAT_COVER,
 161         .gpio_acin       = CORGI_GPIO_AC_IN,
 162         .gpio_batfull    = CORGI_GPIO_CHRG_FULL,
 163         .discharge       = corgi_discharge,
 164         .charge          = corgi_charge,
 165         .measure_temp    = corgi_measure_temp,
 166         .presuspend      = corgi_presuspend,
 167         .postsuspend     = corgi_postsuspend,
 168         .read_devdata    = corgipm_read_devdata,
 169         .charger_wakeup  = corgi_charger_wakeup,
 170         .should_wakeup   = corgi_should_wakeup,
 171 #if defined(CONFIG_LCD_CORGI)
 172         .backlight_limit = corgi_lcd_limit_intensity,
 173 #endif
 174         .charge_on_volt   = SHARPSL_CHARGE_ON_VOLT,
 175         .charge_on_temp   = SHARPSL_CHARGE_ON_TEMP,
 176         .charge_acin_high = SHARPSL_CHARGE_ON_ACIN_HIGH,
 177         .charge_acin_low  = SHARPSL_CHARGE_ON_ACIN_LOW,
 178         .fatal_acin_volt  = SHARPSL_FATAL_ACIN_VOLT,
 179         .fatal_noacin_volt= SHARPSL_FATAL_NOACIN_VOLT,
 180         .bat_levels       = 40,
 181         .bat_levels_noac  = sharpsl_battery_levels_noac,
 182         .bat_levels_acin  = sharpsl_battery_levels_acin,
 183         .status_high_acin = 188,
 184         .status_low_acin  = 178,
 185         .status_high_noac = 185,
 186         .status_low_noac  = 175,
 187 };
 188
 189 static struct platform_device *corgipm_device;
 190
 191 static int corgipm_init(void)
 192 {
 193         int ret;
 194
 195         if (!machine_is_corgi() && !machine_is_shepherd()
 196                         && !machine_is_husky())
 197                 return -ENODEV;
 198
 199         corgipm_device = platform_device_alloc("sharpsl-pm", -1);
 200         if (!corgipm_device)
 201                 return -ENOMEM;
 202
 203         if (!machine_is_corgi())
 204             corgi_pm_machinfo.batfull_irq = 1;
 205
 206         corgipm_device->dev.platform_data = &corgi_pm_machinfo;
 207         ret = platform_device_add(corgipm_device);
 208
 209         if (ret)
 210                 platform_device_put(corgipm_device);
 211
 212         return ret;
 213 }
 214
 215 static void corgipm_exit(void)
 216 {
 217         platform_device_unregister(corgipm_device);
 218 }
 219
 220 module_init(corgipm_init);
 221 module_exit(corgipm_exit);