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 const char * const 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 pr_info("Charger '%s' is connected with known battery", 72 pss[i]); 73 pr_info(" - Rebooting.\n"); 74 machine_restart("charging"); 75 } 76 power_supply_put(psy); 77 } 78 79 shutdown: 80 sigfillset(&all); 81 82 if (!sigprocmask(SIG_BLOCK, &all, &old)) { 83 (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1, 84 AB8500_STW4500CTRL1_SWOFF | 85 AB8500_STW4500CTRL1_SWRESET4500N); 86 (void)sigprocmask(SIG_SETMASK, &old, NULL); 87 } 88 } 89 90 static inline bool valid_bank(u8 bank) 91 { 92 return ((bank == AB8500_SYS_CTRL1_BLOCK) || 93 (bank == AB8500_SYS_CTRL2_BLOCK)); 94 } 95 96 int ab8500_sysctrl_read(u16 reg, u8 *value) 97 { 98 u8 bank; 99 100 if (sysctrl_dev == NULL) 101 return -EINVAL; 102 103 bank = (reg >> 8); 104 if (!valid_bank(bank)) 105 return -EINVAL; 106 107 return abx500_get_register_interruptible(sysctrl_dev, bank, 108 (u8)(reg & 0xFF), value); 109 } 110 EXPORT_SYMBOL(ab8500_sysctrl_read); 111 112 int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) 113 { 114 u8 bank; 115 116 if (sysctrl_dev == NULL) 117 return -EINVAL; 118 119 bank = (reg >> 8); 120 if (!valid_bank(bank)) 121 return -EINVAL; 122 123 return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, 124 (u8)(reg & 0xFF), mask, value); 125 } 126 EXPORT_SYMBOL(ab8500_sysctrl_write); 127 128 static int ab8500_sysctrl_probe(struct platform_device *pdev) 129 { 130 sysctrl_dev = &pdev->dev; 131 132 if (!pm_power_off) 133 pm_power_off = ab8500_power_off; 134 135 return 0; 136 } 137 138 static int ab8500_sysctrl_remove(struct platform_device *pdev) 139 { 140 sysctrl_dev = NULL; 141 142 if (pm_power_off == ab8500_power_off) 143 pm_power_off = NULL; 144 145 return 0; 146 } 147 148 static struct platform_driver ab8500_sysctrl_driver = { 149 .driver = { 150 .name = "ab8500-sysctrl", 151 }, 152 .probe = ab8500_sysctrl_probe, 153 .remove = ab8500_sysctrl_remove, 154 }; 155 156 static int __init ab8500_sysctrl_init(void) 157 { 158 return platform_driver_register(&ab8500_sysctrl_driver); 159 } 160 arch_initcall(ab8500_sysctrl_init); 161 162 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com"); 163 MODULE_DESCRIPTION("AB8500 system control driver"); 164 MODULE_LICENSE("GPL v2"); 165