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 = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
  53
  54                 if (!ret && val.intval) {
  55                         charger_present = true;
  56                         break;
  57                 }
  58         }
  59
  60         if (!charger_present)
  61                 goto shutdown;
  62
  63         /* Check if battery is known */
  64         psy = power_supply_get_by_name("ab8500_btemp");
  65         if (psy) {
  66                 ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY,
  67                                         &val);
  68                 if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
  69                         printk(KERN_INFO
  70                                "Charger \"%s\" is connected with known battery."
  71                                " Rebooting.\n",
  72                                pss[i]);
  73                         machine_restart("charging");
  74                 }
  75         }
  76
  77 shutdown:
  78         sigfillset(&all);
  79
  80         if (!sigprocmask(SIG_BLOCK, &all, &old)) {
  81                 (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
  82                                          AB8500_STW4500CTRL1_SWOFF |
  83                                          AB8500_STW4500CTRL1_SWRESET4500N);
  84                 (void)sigprocmask(SIG_SETMASK, &old, NULL);
  85         }
  86 }
  87
  88 static inline bool valid_bank(u8 bank)
  89 {
  90         return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
  91                 (bank == AB8500_SYS_CTRL2_BLOCK));
  92 }
  93
  94 int ab8500_sysctrl_read(u16 reg, u8 *value)
  95 {
  96         u8 bank;
  97
  98         if (sysctrl_dev == NULL)
  99                 return -EINVAL;
 100
 101         bank = (reg >> 8);
 102         if (!valid_bank(bank))
 103                 return -EINVAL;
 104
 105         return abx500_get_register_interruptible(sysctrl_dev, bank,
 106                 (u8)(reg & 0xFF), value);
 107 }
 108 EXPORT_SYMBOL(ab8500_sysctrl_read);
 109
 110 int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
 111 {
 112         u8 bank;
 113
 114         if (sysctrl_dev == NULL)
 115                 return -EINVAL;
 116
 117         bank = (reg >> 8);
 118         if (!valid_bank(bank))
 119                 return -EINVAL;
 120
 121         return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
 122                 (u8)(reg & 0xFF), mask, value);
 123 }
 124 EXPORT_SYMBOL(ab8500_sysctrl_write);
 125
 126 static int ab8500_sysctrl_probe(struct platform_device *pdev)
 127 {
 128         struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
 129         struct ab8500_platform_data *plat;
 130         struct ab8500_sysctrl_platform_data *pdata;
 131
 132         plat = dev_get_platdata(pdev->dev.parent);
 133
 134         if (!plat)
 135                 return -EINVAL;
 136
 137         sysctrl_dev = &pdev->dev;
 138
 139         if (!pm_power_off)
 140                 pm_power_off = ab8500_power_off;
 141
 142         pdata = plat->sysctrl;
 143         if (pdata) {
 144                 int last, ret, i, j;
 145
 146                 if (is_ab8505(ab8500))
 147                         last = AB8500_SYSCLKREQ4RFCLKBUF;
 148                 else
 149                         last = AB8500_SYSCLKREQ8RFCLKBUF;
 150
 151                 for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
 152                         j = i - AB8500_SYSCLKREQ1RFCLKBUF;
 153                         ret = ab8500_sysctrl_write(i, 0xff,
 154                                         pdata->initial_req_buf_config[j]);
 155                         dev_dbg(&pdev->dev,
 156                                         "Setting SysClkReq%dRfClkBuf 0x%X\n",
 157                                         j + 1,
 158                                         pdata->initial_req_buf_config[j]);
 159                         if (ret < 0) {
 160                                 dev_err(&pdev->dev,
 161                                         "unable to set sysClkReq%dRfClkBuf: "
 162                                         "%d\n", j + 1, ret);
 163                         }
 164                 }
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int ab8500_sysctrl_remove(struct platform_device *pdev)
 171 {
 172         sysctrl_dev = NULL;
 173
 174         if (pm_power_off == ab8500_power_off)
 175                 pm_power_off = NULL;
 176
 177         return 0;
 178 }
 179
 180 static struct platform_driver ab8500_sysctrl_driver = {
 181         .driver = {
 182                 .name = "ab8500-sysctrl",
 183         },
 184         .probe = ab8500_sysctrl_probe,
 185         .remove = ab8500_sysctrl_remove,
 186 };
 187
 188 static int __init ab8500_sysctrl_init(void)
 189 {
 190         return platform_driver_register(&ab8500_sysctrl_driver);
 191 }
 192 arch_initcall(ab8500_sysctrl_init);
 193
 194 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
 195 MODULE_DESCRIPTION("AB8500 system control driver");
 196 MODULE_LICENSE("GPL v2");