/* * AB8500 system control driver * * Copyright (C) ST-Ericsson SA 2010 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. * License terms: GNU General Public License (GPL) version 2 */ #include <linux/err.h> #include <linux/init.h> #include <linux/export.h> #include <linux/platform_device.h> #include <linux/pm.h> #include <linux/reboot.h> #include <linux/signal.h> #include <linux/power_supply.h> #include <linux/mfd/abx500.h> #include <linux/mfd/abx500/ab8500.h> #include <linux/mfd/abx500/ab8500-sysctrl.h> /* RtcCtrl bits */ #define AB8500_ALARM_MIN_LOW 0x08 #define AB8500_ALARM_MIN_MID 0x09 #define RTC_CTRL 0x0B #define RTC_ALARM_ENABLE 0x4 static struct device *sysctrl_dev; static void ab8500_power_off(void) { sigset_t old; sigset_t all; static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"}; int i; bool charger_present = false; union power_supply_propval val; struct power_supply *psy; int ret; if (sysctrl_dev == NULL) { pr_err("%s: sysctrl not initialized\n", __func__); return; } /* * If we have a charger connected and we're powering off, * reboot into charge-only mode. */ for (i = 0; i < ARRAY_SIZE(pss); i++) { psy = power_supply_get_by_name(pss[i]); if (!psy) continue; ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val); power_supply_put(psy); if (!ret && val.intval) { charger_present = true; break; } } if (!charger_present) goto shutdown; /* Check if battery is known */ psy = power_supply_get_by_name("ab8500_btemp"); if (psy) { ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY, &val); if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) { pr_info("Charger '%s' is connected with known battery", pss[i]); pr_info(" - Rebooting.\n"); machine_restart("charging"); } power_supply_put(psy); } shutdown: sigfillset(&all); if (!sigprocmask(SIG_BLOCK, &all, &old)) { (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1, AB8500_STW4500CTRL1_SWOFF | AB8500_STW4500CTRL1_SWRESET4500N); (void)sigprocmask(SIG_SETMASK, &old, NULL); } } static inline bool valid_bank(u8 bank) { return ((bank == AB8500_SYS_CTRL1_BLOCK) || (bank == AB8500_SYS_CTRL2_BLOCK)); } int ab8500_sysctrl_read(u16 reg, u8 *value) { u8 bank; if (sysctrl_dev == NULL) return -EPROBE_DEFER; bank = (reg >> 8); if (!valid_bank(bank)) return -EINVAL; return abx500_get_register_interruptible(sysctrl_dev, bank, (u8)(reg & 0xFF), value); } EXPORT_SYMBOL(ab8500_sysctrl_read); int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) { u8 bank; if (sysctrl_dev == NULL) return -EPROBE_DEFER; bank = (reg >> 8); if (!valid_bank(bank)) { pr_err("invalid bank\n"); return -EINVAL; } return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, (u8)(reg & 0xFF), mask, value); } EXPORT_SYMBOL(ab8500_sysctrl_write); static int ab8500_sysctrl_probe(struct platform_device *pdev) { sysctrl_dev = &pdev->dev; if (!pm_power_off) pm_power_off = ab8500_power_off; return 0; } static int ab8500_sysctrl_remove(struct platform_device *pdev) { sysctrl_dev = NULL; if (pm_power_off == ab8500_power_off) pm_power_off = NULL; return 0; } static const struct of_device_id ab8500_sysctrl_match[] = { { .compatible = "stericsson,ab8500-sysctrl", }, {} }; static struct platform_driver ab8500_sysctrl_driver = { .driver = { .name = "ab8500-sysctrl", .of_match_table = ab8500_sysctrl_match, }, .probe = ab8500_sysctrl_probe, .remove = ab8500_sysctrl_remove, }; static int __init ab8500_sysctrl_init(void) { return platform_driver_register(&ab8500_sysctrl_driver); } arch_initcall(ab8500_sysctrl_init);