190550d19SMattias Nilsson /* 2dac94efaSPaul Gortmaker * AB8500 system control driver 3dac94efaSPaul Gortmaker * 490550d19SMattias Nilsson * Copyright (C) ST-Ericsson SA 2010 590550d19SMattias Nilsson * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. 690550d19SMattias Nilsson * License terms: GNU General Public License (GPL) version 2 790550d19SMattias Nilsson */ 890550d19SMattias Nilsson 990550d19SMattias Nilsson #include <linux/err.h> 10dac94efaSPaul Gortmaker #include <linux/init.h> 11dac94efaSPaul Gortmaker #include <linux/export.h> 1290550d19SMattias Nilsson #include <linux/platform_device.h> 13379749c4SLee Jones #include <linux/pm.h> 147c34d7c2SJonas Aaberg #include <linux/reboot.h> 15379749c4SLee Jones #include <linux/signal.h> 167c34d7c2SJonas Aaberg #include <linux/power_supply.h> 1790550d19SMattias Nilsson #include <linux/mfd/abx500.h> 18ee66e653SLinus Walleij #include <linux/mfd/abx500/ab8500.h> 19ee66e653SLinus Walleij #include <linux/mfd/abx500/ab8500-sysctrl.h> 2090550d19SMattias Nilsson 2175932094SLee Jones /* RtcCtrl bits */ 2275932094SLee Jones #define AB8500_ALARM_MIN_LOW 0x08 2375932094SLee Jones #define AB8500_ALARM_MIN_MID 0x09 2475932094SLee Jones #define RTC_CTRL 0x0B 2575932094SLee Jones #define RTC_ALARM_ENABLE 0x4 2675932094SLee Jones 2790550d19SMattias Nilsson static struct device *sysctrl_dev; 2890550d19SMattias Nilsson 293d2088a1SFabio Baltieri static void ab8500_power_off(void) 30379749c4SLee Jones { 31379749c4SLee Jones sigset_t old; 32379749c4SLee Jones sigset_t all; 3363b4fd75SLee Jones static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"}; 347c34d7c2SJonas Aaberg int i; 350903940dSJonas Aaberg bool charger_present = false; 360903940dSJonas Aaberg union power_supply_propval val; 370903940dSJonas Aaberg struct power_supply *psy; 380903940dSJonas Aaberg int ret; 397c34d7c2SJonas Aaberg 402377e52fSMarcus Danielsson if (sysctrl_dev == NULL) { 412377e52fSMarcus Danielsson pr_err("%s: sysctrl not initialized\n", __func__); 422377e52fSMarcus Danielsson return; 432377e52fSMarcus Danielsson } 442377e52fSMarcus Danielsson 457c34d7c2SJonas Aaberg /* 467c34d7c2SJonas Aaberg * If we have a charger connected and we're powering off, 477c34d7c2SJonas Aaberg * reboot into charge-only mode. 487c34d7c2SJonas Aaberg */ 497c34d7c2SJonas Aaberg 507c34d7c2SJonas Aaberg for (i = 0; i < ARRAY_SIZE(pss); i++) { 517c34d7c2SJonas Aaberg psy = power_supply_get_by_name(pss[i]); 527c34d7c2SJonas Aaberg if (!psy) 537c34d7c2SJonas Aaberg continue; 540903940dSJonas Aaberg 55091e73a2SKrzysztof Kozlowski ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE, 56091e73a2SKrzysztof Kozlowski &val); 576ff9d25bSKrzysztof Kozlowski power_supply_put(psy); 587c34d7c2SJonas Aaberg 597c34d7c2SJonas Aaberg if (!ret && val.intval) { 600903940dSJonas Aaberg charger_present = true; 610903940dSJonas Aaberg break; 620903940dSJonas Aaberg } 630903940dSJonas Aaberg } 640903940dSJonas Aaberg 650903940dSJonas Aaberg if (!charger_present) 660903940dSJonas Aaberg goto shutdown; 670903940dSJonas Aaberg 680903940dSJonas Aaberg /* Check if battery is known */ 690903940dSJonas Aaberg psy = power_supply_get_by_name("ab8500_btemp"); 700903940dSJonas Aaberg if (psy) { 71091e73a2SKrzysztof Kozlowski ret = power_supply_get_property(psy, 72091e73a2SKrzysztof Kozlowski POWER_SUPPLY_PROP_TECHNOLOGY, &val); 730903940dSJonas Aaberg if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) { 7463b4fd75SLee Jones pr_info("Charger '%s' is connected with known battery", 757c34d7c2SJonas Aaberg pss[i]); 7663b4fd75SLee Jones pr_info(" - Rebooting.\n"); 775a4bac6eSJonas Aaberg machine_restart("charging"); 787c34d7c2SJonas Aaberg } 796ff9d25bSKrzysztof Kozlowski power_supply_put(psy); 807c34d7c2SJonas Aaberg } 81379749c4SLee Jones 820903940dSJonas Aaberg shutdown: 83379749c4SLee Jones sigfillset(&all); 84379749c4SLee Jones 85379749c4SLee Jones if (!sigprocmask(SIG_BLOCK, &all, &old)) { 86379749c4SLee Jones (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1, 87379749c4SLee Jones AB8500_STW4500CTRL1_SWOFF | 88379749c4SLee Jones AB8500_STW4500CTRL1_SWRESET4500N); 89379749c4SLee Jones (void)sigprocmask(SIG_SETMASK, &old, NULL); 90379749c4SLee Jones } 91379749c4SLee Jones } 92379749c4SLee Jones 9390550d19SMattias Nilsson static inline bool valid_bank(u8 bank) 9490550d19SMattias Nilsson { 9590550d19SMattias Nilsson return ((bank == AB8500_SYS_CTRL1_BLOCK) || 9690550d19SMattias Nilsson (bank == AB8500_SYS_CTRL2_BLOCK)); 9790550d19SMattias Nilsson } 9890550d19SMattias Nilsson 9990550d19SMattias Nilsson int ab8500_sysctrl_read(u16 reg, u8 *value) 10090550d19SMattias Nilsson { 10190550d19SMattias Nilsson u8 bank; 10290550d19SMattias Nilsson 10390550d19SMattias Nilsson if (sysctrl_dev == NULL) 1047e9c40c6SLinus Walleij return -EPROBE_DEFER; 10590550d19SMattias Nilsson 10690550d19SMattias Nilsson bank = (reg >> 8); 10790550d19SMattias Nilsson if (!valid_bank(bank)) 10890550d19SMattias Nilsson return -EINVAL; 10990550d19SMattias Nilsson 11090550d19SMattias Nilsson return abx500_get_register_interruptible(sysctrl_dev, bank, 11190550d19SMattias Nilsson (u8)(reg & 0xFF), value); 11290550d19SMattias Nilsson } 113c73db9f7SJonas Aaberg EXPORT_SYMBOL(ab8500_sysctrl_read); 11490550d19SMattias Nilsson 11590550d19SMattias Nilsson int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) 11690550d19SMattias Nilsson { 11790550d19SMattias Nilsson u8 bank; 11890550d19SMattias Nilsson 11990550d19SMattias Nilsson if (sysctrl_dev == NULL) 1207e9c40c6SLinus Walleij return -EPROBE_DEFER; 12190550d19SMattias Nilsson 12290550d19SMattias Nilsson bank = (reg >> 8); 1237e9c40c6SLinus Walleij if (!valid_bank(bank)) { 1247e9c40c6SLinus Walleij pr_err("invalid bank\n"); 12590550d19SMattias Nilsson return -EINVAL; 1267e9c40c6SLinus Walleij } 12790550d19SMattias Nilsson 12890550d19SMattias Nilsson return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, 12990550d19SMattias Nilsson (u8)(reg & 0xFF), mask, value); 13090550d19SMattias Nilsson } 131c73db9f7SJonas Aaberg EXPORT_SYMBOL(ab8500_sysctrl_write); 13290550d19SMattias Nilsson 133f791be49SBill Pemberton static int ab8500_sysctrl_probe(struct platform_device *pdev) 13490550d19SMattias Nilsson { 1359f7af61aSFabio Baltieri sysctrl_dev = &pdev->dev; 1369f7af61aSFabio Baltieri 1370b8ebdb1SFabio Baltieri if (!pm_power_off) 138379749c4SLee Jones pm_power_off = ab8500_power_off; 1391abf063fSKennet Wallden 14090550d19SMattias Nilsson return 0; 14190550d19SMattias Nilsson } 14290550d19SMattias Nilsson 1434740f73fSBill Pemberton static int ab8500_sysctrl_remove(struct platform_device *pdev) 14490550d19SMattias Nilsson { 14590550d19SMattias Nilsson sysctrl_dev = NULL; 1460b8ebdb1SFabio Baltieri 1470b8ebdb1SFabio Baltieri if (pm_power_off == ab8500_power_off) 1480b8ebdb1SFabio Baltieri pm_power_off = NULL; 1490b8ebdb1SFabio Baltieri 15090550d19SMattias Nilsson return 0; 15190550d19SMattias Nilsson } 15290550d19SMattias Nilsson 1537e9c40c6SLinus Walleij static const struct of_device_id ab8500_sysctrl_match[] = { 1547e9c40c6SLinus Walleij { .compatible = "stericsson,ab8500-sysctrl", }, 1557e9c40c6SLinus Walleij {} 1567e9c40c6SLinus Walleij }; 1577e9c40c6SLinus Walleij 15890550d19SMattias Nilsson static struct platform_driver ab8500_sysctrl_driver = { 15990550d19SMattias Nilsson .driver = { 16090550d19SMattias Nilsson .name = "ab8500-sysctrl", 1617e9c40c6SLinus Walleij .of_match_table = ab8500_sysctrl_match, 16290550d19SMattias Nilsson }, 16390550d19SMattias Nilsson .probe = ab8500_sysctrl_probe, 16484449216SBill Pemberton .remove = ab8500_sysctrl_remove, 16590550d19SMattias Nilsson }; 16690550d19SMattias Nilsson 16790550d19SMattias Nilsson static int __init ab8500_sysctrl_init(void) 16890550d19SMattias Nilsson { 16990550d19SMattias Nilsson return platform_driver_register(&ab8500_sysctrl_driver); 17090550d19SMattias Nilsson } 171caa62d64SUlf Hansson arch_initcall(ab8500_sysctrl_init); 172