linux/drivers/mfd/ab8500-sysctrl.c
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   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
  18static struct device *sysctrl_dev;
  19
  20void ab8500_power_off(void)
  21{
  22        sigset_t old;
  23        sigset_t all;
  24        static char *pss[] = {"ab8500_ac", "ab8500_usb"};
  25        int i;
  26        bool charger_present = false;
  27        union power_supply_propval val;
  28        struct power_supply *psy;
  29        int ret;
  30
  31        /*
  32         * If we have a charger connected and we're powering off,
  33         * reboot into charge-only mode.
  34         */
  35
  36        for (i = 0; i < ARRAY_SIZE(pss); i++) {
  37                psy = power_supply_get_by_name(pss[i]);
  38                if (!psy)
  39                        continue;
  40
  41                ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
  42
  43                if (!ret && val.intval) {
  44                        charger_present = true;
  45                        break;
  46                }
  47        }
  48
  49        if (!charger_present)
  50                goto shutdown;
  51
  52        /* Check if battery is known */
  53        psy = power_supply_get_by_name("ab8500_btemp");
  54        if (psy) {
  55                ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY,
  56                                        &val);
  57                if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
  58                        printk(KERN_INFO
  59                               "Charger \"%s\" is connected with known battery."
  60                               " Rebooting.\n",
  61                               pss[i]);
  62                        machine_restart("charging");
  63                }
  64        }
  65
  66shutdown:
  67        sigfillset(&all);
  68
  69        if (!sigprocmask(SIG_BLOCK, &all, &old)) {
  70                (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
  71                                         AB8500_STW4500CTRL1_SWOFF |
  72                                         AB8500_STW4500CTRL1_SWRESET4500N);
  73                (void)sigprocmask(SIG_SETMASK, &old, NULL);
  74        }
  75}
  76
  77static inline bool valid_bank(u8 bank)
  78{
  79        return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
  80                (bank == AB8500_SYS_CTRL2_BLOCK));
  81}
  82
  83int ab8500_sysctrl_read(u16 reg, u8 *value)
  84{
  85        u8 bank;
  86
  87        if (sysctrl_dev == NULL)
  88                return -EAGAIN;
  89
  90        bank = (reg >> 8);
  91        if (!valid_bank(bank))
  92                return -EINVAL;
  93
  94        return abx500_get_register_interruptible(sysctrl_dev, bank,
  95                (u8)(reg & 0xFF), value);
  96}
  97EXPORT_SYMBOL(ab8500_sysctrl_read);
  98
  99int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
 100{
 101        u8 bank;
 102
 103        if (sysctrl_dev == NULL)
 104                return -EAGAIN;
 105
 106        bank = (reg >> 8);
 107        if (!valid_bank(bank))
 108                return -EINVAL;
 109
 110        return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
 111                (u8)(reg & 0xFF), mask, value);
 112}
 113EXPORT_SYMBOL(ab8500_sysctrl_write);
 114
 115static int ab8500_sysctrl_probe(struct platform_device *pdev)
 116{
 117        struct ab8500_platform_data *plat;
 118        struct ab8500_sysctrl_platform_data *pdata;
 119
 120        sysctrl_dev = &pdev->dev;
 121        plat = dev_get_platdata(pdev->dev.parent);
 122        if (plat->pm_power_off)
 123                pm_power_off = ab8500_power_off;
 124
 125        pdata = plat->sysctrl;
 126
 127        if (pdata) {
 128                int ret, i, j;
 129
 130                for (i = AB8500_SYSCLKREQ1RFCLKBUF;
 131                     i <= AB8500_SYSCLKREQ8RFCLKBUF; i++) {
 132                        j = i - AB8500_SYSCLKREQ1RFCLKBUF;
 133                        ret = ab8500_sysctrl_write(i, 0xff,
 134                                                   pdata->initial_req_buf_config[j]);
 135                        dev_dbg(&pdev->dev,
 136                                "Setting SysClkReq%dRfClkBuf 0x%X\n",
 137                                j + 1,
 138                                pdata->initial_req_buf_config[j]);
 139                        if (ret < 0) {
 140                                dev_err(&pdev->dev,
 141                                        "unable to set sysClkReq%dRfClkBuf: "
 142                                        "%d\n", j + 1, ret);
 143                        }
 144                }
 145        }
 146
 147        return 0;
 148}
 149
 150static int ab8500_sysctrl_remove(struct platform_device *pdev)
 151{
 152        sysctrl_dev = NULL;
 153        return 0;
 154}
 155
 156static struct platform_driver ab8500_sysctrl_driver = {
 157        .driver = {
 158                .name = "ab8500-sysctrl",
 159                .owner = THIS_MODULE,
 160        },
 161        .probe = ab8500_sysctrl_probe,
 162        .remove = ab8500_sysctrl_remove,
 163};
 164
 165static int __init ab8500_sysctrl_init(void)
 166{
 167        return platform_driver_register(&ab8500_sysctrl_driver);
 168}
 169subsys_initcall(ab8500_sysctrl_init);
 170
 171MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
 172MODULE_DESCRIPTION("AB8500 system control driver");
 173MODULE_LICENSE("GPL v2");
 174
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