| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * AB8500 system control driver |
| 3 | * |
| 4 | * Copyright (C) ST-Ericsson SA 2010 |
| 5 | * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. |
| 6 | * License terms: GNU General Public License (GPL) version 2 |
| 7 | */ |
| 8 | |
| 9 | #include <linux/err.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/export.h> |
| 12 | #include <linux/platform_device.h> |
| 13 | #include <linux/pm.h> |
| 14 | #include <linux/reboot.h> |
| 15 | #include <linux/signal.h> |
| 16 | #include <linux/power_supply.h> |
| 17 | #include <linux/mfd/abx500.h> |
| 18 | #include <linux/mfd/abx500/ab8500.h> |
| 19 | #include <linux/mfd/abx500/ab8500-sysctrl.h> |
| 20 | |
| 21 | /* RtcCtrl bits */ |
| 22 | #define AB8500_ALARM_MIN_LOW 0x08 |
| 23 | #define AB8500_ALARM_MIN_MID 0x09 |
| 24 | #define RTC_CTRL 0x0B |
| 25 | #define RTC_ALARM_ENABLE 0x4 |
| 26 | |
| 27 | static struct device *sysctrl_dev; |
| 28 | |
| 29 | static void ab8500_power_off(void) |
| 30 | { |
| 31 | sigset_t old; |
| 32 | sigset_t all; |
| 33 | static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"}; |
| 34 | int i; |
| 35 | bool charger_present = false; |
| 36 | union power_supply_propval val; |
| 37 | struct power_supply *psy; |
| 38 | int ret; |
| 39 | |
| 40 | if (sysctrl_dev == NULL) { |
| 41 | pr_err("%s: sysctrl not initialized\n", __func__); |
| 42 | return; |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * If we have a charger connected and we're powering off, |
| 47 | * reboot into charge-only mode. |
| 48 | */ |
| 49 | |
| 50 | for (i = 0; i < ARRAY_SIZE(pss); i++) { |
| 51 | psy = power_supply_get_by_name(pss[i]); |
| 52 | if (!psy) |
| 53 | continue; |
| 54 | |
| 55 | ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE, |
| 56 | &val); |
| 57 | power_supply_put(psy); |
| 58 | |
| 59 | if (!ret && val.intval) { |
| 60 | charger_present = true; |
| 61 | break; |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | if (!charger_present) |
| 66 | goto shutdown; |
| 67 | |
| 68 | /* Check if battery is known */ |
| 69 | psy = power_supply_get_by_name("ab8500_btemp"); |
| 70 | if (psy) { |
| 71 | ret = power_supply_get_property(psy, |
| 72 | POWER_SUPPLY_PROP_TECHNOLOGY, &val); |
| 73 | if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) { |
| 74 | pr_info("Charger '%s' is connected with known battery", |
| 75 | pss[i]); |
| 76 | pr_info(" - Rebooting.\n"); |
| 77 | machine_restart("charging"); |
| 78 | } |
| 79 | power_supply_put(psy); |
| 80 | } |
| 81 | |
| 82 | shutdown: |
| 83 | sigfillset(&all); |
| 84 | |
| 85 | if (!sigprocmask(SIG_BLOCK, &all, &old)) { |
| 86 | (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1, |
| 87 | AB8500_STW4500CTRL1_SWOFF | |
| 88 | AB8500_STW4500CTRL1_SWRESET4500N); |
| 89 | (void)sigprocmask(SIG_SETMASK, &old, NULL); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static inline bool valid_bank(u8 bank) |
| 94 | { |
| 95 | return ((bank == AB8500_SYS_CTRL1_BLOCK) || |
| 96 | (bank == AB8500_SYS_CTRL2_BLOCK)); |
| 97 | } |
| 98 | |
| 99 | int ab8500_sysctrl_read(u16 reg, u8 *value) |
| 100 | { |
| 101 | u8 bank; |
| 102 | |
| 103 | if (sysctrl_dev == NULL) |
| 104 | return -EPROBE_DEFER; |
| 105 | |
| 106 | bank = (reg >> 8); |
| 107 | if (!valid_bank(bank)) |
| 108 | return -EINVAL; |
| 109 | |
| 110 | return abx500_get_register_interruptible(sysctrl_dev, bank, |
| 111 | (u8)(reg & 0xFF), value); |
| 112 | } |
| 113 | EXPORT_SYMBOL(ab8500_sysctrl_read); |
| 114 | |
| 115 | int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) |
| 116 | { |
| 117 | u8 bank; |
| 118 | |
| 119 | if (sysctrl_dev == NULL) |
| 120 | return -EPROBE_DEFER; |
| 121 | |
| 122 | bank = (reg >> 8); |
| 123 | if (!valid_bank(bank)) { |
| 124 | pr_err("invalid bank\n"); |
| 125 | return -EINVAL; |
| 126 | } |
| 127 | |
| 128 | return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, |
| 129 | (u8)(reg & 0xFF), mask, value); |
| 130 | } |
| 131 | EXPORT_SYMBOL(ab8500_sysctrl_write); |
| 132 | |
| 133 | static int ab8500_sysctrl_probe(struct platform_device *pdev) |
| 134 | { |
| 135 | sysctrl_dev = &pdev->dev; |
| 136 | |
| 137 | if (!pm_power_off) |
| 138 | pm_power_off = ab8500_power_off; |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | static int ab8500_sysctrl_remove(struct platform_device *pdev) |
| 144 | { |
| 145 | sysctrl_dev = NULL; |
| 146 | |
| 147 | if (pm_power_off == ab8500_power_off) |
| 148 | pm_power_off = NULL; |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static const struct of_device_id ab8500_sysctrl_match[] = { |
| 154 | { .compatible = "stericsson,ab8500-sysctrl", }, |
| 155 | {} |
| 156 | }; |
| 157 | |
| 158 | static struct platform_driver ab8500_sysctrl_driver = { |
| 159 | .driver = { |
| 160 | .name = "ab8500-sysctrl", |
| 161 | .of_match_table = ab8500_sysctrl_match, |
| 162 | }, |
| 163 | .probe = ab8500_sysctrl_probe, |
| 164 | .remove = ab8500_sysctrl_remove, |
| 165 | }; |
| 166 | |
| 167 | static int __init ab8500_sysctrl_init(void) |
| 168 | { |
| 169 | return platform_driver_register(&ab8500_sysctrl_driver); |
| 170 | } |
| 171 | arch_initcall(ab8500_sysctrl_init); |