drivers/mfd/ab8500-sysctrl.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
   4  * License terms: GNU General Public License (GPL) version 2
   5  */
   6
   7 #include <linux/err.h>
   8 #include <linux/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/pm.h>
  11 #include <linux/reboot.h>
  12 #include <linux/signal.h>
  13 #include <linux/power_supply.h>
  14 #include <linux/mfd/abx500.h>
  15 #include <linux/mfd/abx500/ab8500.h>
  16 #include <linux/mfd/abx500/ab8500-sysctrl.h>
  17
  18 /* RtcCtrl bits */
  19 #define AB8500_ALARM_MIN_LOW  0x08
  20 #define AB8500_ALARM_MIN_MID 0x09
  21 #define RTC_CTRL 0x0B
  22 #define RTC_ALARM_ENABLE 0x4
  23
  24 static struct device *sysctrl_dev;
  25
  26 static void ab8500_power_off(void)
  27 {
  28         sigset_t old;
  29         sigset_t all;
  30         static char *pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
  31         int i;
  32         bool charger_present = false;
  33         union power_supply_propval val;
  34         struct power_supply *psy;
  35         int ret;
  36
  37         if (sysctrl_dev == NULL) {
  38                 pr_err("%s: sysctrl not initialized\n", __func__);
  39                 return;
  40         }
  41
  42         /*
  43          * If we have a charger connected and we're powering off,
  44          * reboot into charge-only mode.
  45          */
  46
  47         for (i = 0; i < ARRAY_SIZE(pss); i++) {
  48                 psy = power_supply_get_by_name(pss[i]);
  49                 if (!psy)
  50                         continue;
  51
  52                 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
  53                                 &val);
  54                 power_supply_put(psy);
  55
  56                 if (!ret && val.intval) {
  57                         charger_present = true;
  58                         break;
  59                 }
  60         }
  61
  62         if (!charger_present)
  63                 goto shutdown;
  64
  65         /* Check if battery is known */
  66         psy = power_supply_get_by_name("ab8500_btemp");
  67         if (psy) {
  68                 ret = power_supply_get_property(psy,
  69                                 POWER_SUPPLY_PROP_TECHNOLOGY, &val);
  70                 if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
  71                         printk(KERN_INFO
  72                                "Charger \"%s\" is connected with known battery."
  73                                " Rebooting.\n",
  74                                pss[i]);
  75                         machine_restart("charging");
  76                 }
  77                 power_supply_put(psy);
  78         }
  79
  80 shutdown:
  81         sigfillset(&all);
  82
  83         if (!sigprocmask(SIG_BLOCK, &all, &old)) {
  84                 (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
  85                                          AB8500_STW4500CTRL1_SWOFF |
  86                                          AB8500_STW4500CTRL1_SWRESET4500N);
  87                 (void)sigprocmask(SIG_SETMASK, &old, NULL);
  88         }
  89 }
  90
  91 static inline bool valid_bank(u8 bank)
  92 {
  93         return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
  94                 (bank == AB8500_SYS_CTRL2_BLOCK));
  95 }
  96
  97 int ab8500_sysctrl_read(u16 reg, u8 *value)
  98 {
  99         u8 bank;
 100
 101         if (sysctrl_dev == NULL)
 102                 return -EINVAL;
 103
 104         bank = (reg >> 8);
 105         if (!valid_bank(bank))
 106                 return -EINVAL;
 107
 108         return abx500_get_register_interruptible(sysctrl_dev, bank,
 109                 (u8)(reg & 0xFF), value);
 110 }
 111 EXPORT_SYMBOL(ab8500_sysctrl_read);
 112
 113 int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
 114 {
 115         u8 bank;
 116
 117         if (sysctrl_dev == NULL)
 118                 return -EINVAL;
 119
 120         bank = (reg >> 8);
 121         if (!valid_bank(bank))
 122                 return -EINVAL;
 123
 124         return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
 125                 (u8)(reg & 0xFF), mask, value);
 126 }
 127 EXPORT_SYMBOL(ab8500_sysctrl_write);
 128
 129 static int ab8500_sysctrl_probe(struct platform_device *pdev)
 130 {
 131         struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
 132         struct ab8500_platform_data *plat;
 133         struct ab8500_sysctrl_platform_data *pdata;
 134
 135         plat = dev_get_platdata(pdev->dev.parent);
 136
 137         if (!plat)
 138                 return -EINVAL;
 139
 140         sysctrl_dev = &pdev->dev;
 141
 142         if (!pm_power_off)
 143                 pm_power_off = ab8500_power_off;
 144
 145         pdata = plat->sysctrl;
 146         if (pdata) {
 147                 int last, ret, i, j;
 148
 149                 if (is_ab8505(ab8500))
 150                         last = AB8500_SYSCLKREQ4RFCLKBUF;
 151                 else
 152                         last = AB8500_SYSCLKREQ8RFCLKBUF;
 153
 154                 for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
 155                         j = i - AB8500_SYSCLKREQ1RFCLKBUF;
 156                         ret = ab8500_sysctrl_write(i, 0xff,
 157                                         pdata->initial_req_buf_config[j]);
 158                         dev_dbg(&pdev->dev,
 159                                         "Setting SysClkReq%dRfClkBuf 0x%X\n",
 160                                         j + 1,
 161                                         pdata->initial_req_buf_config[j]);
 162                         if (ret < 0) {
 163                                 dev_err(&pdev->dev,
 164                                         "unable to set sysClkReq%dRfClkBuf: "
 165                                         "%d\n", j + 1, ret);
 166                         }
 167                 }
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int ab8500_sysctrl_remove(struct platform_device *pdev)
 174 {
 175         sysctrl_dev = NULL;
 176
 177         if (pm_power_off == ab8500_power_off)
 178                 pm_power_off = NULL;
 179
 180         return 0;
 181 }
 182
 183 static struct platform_driver ab8500_sysctrl_driver = {
 184         .driver = {
 185                 .name = "ab8500-sysctrl",
 186         },
 187         .probe = ab8500_sysctrl_probe,
 188         .remove = ab8500_sysctrl_remove,
 189 };
 190
 191 static int __init ab8500_sysctrl_init(void)
 192 {
 193         return platform_driver_register(&ab8500_sysctrl_driver);
 194 }
 195 arch_initcall(ab8500_sysctrl_init);
 196
 197 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
 198 MODULE_DESCRIPTION("AB8500 system control driver");
 199 MODULE_LICENSE("GPL v2");