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 -EPROBE_DEFER;
 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 -EPROBE_DEFER;
 119
 120         bank = (reg >> 8);
 121         if (!valid_bank(bank)) {
 122                 pr_err("invalid bank\n");
 123                 return -EINVAL;
 124         }
 125
 126         return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
 127                 (u8)(reg & 0xFF), mask, value);
 128 }
 129 EXPORT_SYMBOL(ab8500_sysctrl_write);
 130
 131 static int ab8500_sysctrl_probe(struct platform_device *pdev)
 132 {
 133         struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
 134         struct ab8500_platform_data *plat;
 135         struct ab8500_sysctrl_platform_data *pdata;
 136
 137         plat = dev_get_platdata(pdev->dev.parent);
 138
 139         if (!plat)
 140                 return -EINVAL;
 141
 142         sysctrl_dev = &pdev->dev;
 143
 144         if (!pm_power_off)
 145                 pm_power_off = ab8500_power_off;
 146
 147         pdata = plat->sysctrl;
 148         if (pdata) {
 149                 int last, ret, i, j;
 150
 151                 if (is_ab8505(ab8500))
 152                         last = AB8500_SYSCLKREQ4RFCLKBUF;
 153                 else
 154                         last = AB8500_SYSCLKREQ8RFCLKBUF;
 155
 156                 for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
 157                         j = i - AB8500_SYSCLKREQ1RFCLKBUF;
 158                         ret = ab8500_sysctrl_write(i, 0xff,
 159                                         pdata->initial_req_buf_config[j]);
 160                         dev_dbg(&pdev->dev,
 161                                         "Setting SysClkReq%dRfClkBuf 0x%X\n",
 162                                         j + 1,
 163                                         pdata->initial_req_buf_config[j]);
 164                         if (ret < 0) {
 165                                 dev_err(&pdev->dev,
 166                                         "unable to set sysClkReq%dRfClkBuf: "
 167                                         "%d\n", j + 1, ret);
 168                         }
 169                 }
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int ab8500_sysctrl_remove(struct platform_device *pdev)
 176 {
 177         sysctrl_dev = NULL;
 178
 179         if (pm_power_off == ab8500_power_off)
 180                 pm_power_off = NULL;
 181
 182         return 0;
 183 }
 184
 185 static const struct of_device_id ab8500_sysctrl_match[] = {
 186         { .compatible = "stericsson,ab8500-sysctrl", },
 187         {}
 188 };
 189
 190 static struct platform_driver ab8500_sysctrl_driver = {
 191         .driver = {
 192                 .name = "ab8500-sysctrl",
 193                 .of_match_table = ab8500_sysctrl_match,
 194         },
 195         .probe = ab8500_sysctrl_probe,
 196         .remove = ab8500_sysctrl_remove,
 197 };
 198
 199 static int __init ab8500_sysctrl_init(void)
 200 {
 201         return platform_driver_register(&ab8500_sysctrl_driver);
 202 }
 203 arch_initcall(ab8500_sysctrl_init);
 204
 205 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
 206 MODULE_DESCRIPTION("AB8500 system control driver");
 207 MODULE_LICENSE("GPL v2");