Thomas Gleixner | af873fc | 2019-05-28 09:57:21 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 2 | /* |
Paul Gortmaker | dac94ef | 2016-10-29 21:24:39 -0400 | [diff] [blame] | 3 | * AB8500 system control driver |
| 4 | * |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 5 | * Copyright (C) ST-Ericsson SA 2010 |
| 6 | * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include <linux/err.h> |
Paul Gortmaker | dac94ef | 2016-10-29 21:24:39 -0400 | [diff] [blame] | 10 | #include <linux/init.h> |
| 11 | #include <linux/export.h> |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 12 | #include <linux/platform_device.h> |
Lee Jones | 379749c | 2013-01-14 13:26:15 +0000 | [diff] [blame] | 13 | #include <linux/pm.h> |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 14 | #include <linux/reboot.h> |
Lee Jones | 379749c | 2013-01-14 13:26:15 +0000 | [diff] [blame] | 15 | #include <linux/signal.h> |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 16 | #include <linux/power_supply.h> |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 17 | #include <linux/mfd/abx500.h> |
Linus Walleij | ee66e65 | 2011-12-02 14:16:33 +0100 | [diff] [blame] | 18 | #include <linux/mfd/abx500/ab8500.h> |
| 19 | #include <linux/mfd/abx500/ab8500-sysctrl.h> |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 20 | |
Lee Jones | 7593209 | 2013-02-12 15:11:19 +0000 | [diff] [blame] | 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 | |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 27 | static struct device *sysctrl_dev; |
| 28 | |
Fabio Baltieri | 3d2088a | 2013-04-26 14:17:15 +0200 | [diff] [blame] | 29 | static void ab8500_power_off(void) |
Lee Jones | 379749c | 2013-01-14 13:26:15 +0000 | [diff] [blame] | 30 | { |
| 31 | sigset_t old; |
| 32 | sigset_t all; |
Lee Jones | 63b4fd7 | 2015-10-28 11:11:05 +0000 | [diff] [blame] | 33 | static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"}; |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 34 | int i; |
Jonas Aaberg | 0903940 | 2011-08-17 15:58:52 +0200 | [diff] [blame] | 35 | bool charger_present = false; |
| 36 | union power_supply_propval val; |
| 37 | struct power_supply *psy; |
| 38 | int ret; |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 39 | |
Marcus Danielsson | 2377e52 | 2012-06-18 15:00:40 +0200 | [diff] [blame] | 40 | if (sysctrl_dev == NULL) { |
| 41 | pr_err("%s: sysctrl not initialized\n", __func__); |
| 42 | return; |
| 43 | } |
| 44 | |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 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++) { |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 51 | psy = power_supply_get_by_name(pss[i]); |
| 52 | if (!psy) |
| 53 | continue; |
Jonas Aaberg | 0903940 | 2011-08-17 15:58:52 +0200 | [diff] [blame] | 54 | |
Krzysztof Kozlowski | 091e73a | 2015-03-12 08:44:07 +0100 | [diff] [blame] | 55 | ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE, |
| 56 | &val); |
Krzysztof Kozlowski | 6ff9d25b | 2015-03-12 08:44:19 +0100 | [diff] [blame] | 57 | power_supply_put(psy); |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 58 | |
| 59 | if (!ret && val.intval) { |
Jonas Aaberg | 0903940 | 2011-08-17 15:58:52 +0200 | [diff] [blame] | 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) { |
Krzysztof Kozlowski | 091e73a | 2015-03-12 08:44:07 +0100 | [diff] [blame] | 71 | ret = power_supply_get_property(psy, |
| 72 | POWER_SUPPLY_PROP_TECHNOLOGY, &val); |
Jonas Aaberg | 0903940 | 2011-08-17 15:58:52 +0200 | [diff] [blame] | 73 | if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) { |
Lee Jones | 63b4fd7 | 2015-10-28 11:11:05 +0000 | [diff] [blame] | 74 | pr_info("Charger '%s' is connected with known battery", |
| 75 | pss[i]); |
| 76 | pr_info(" - Rebooting.\n"); |
Jonas Aaberg | 5a4bac6 | 2011-08-18 10:14:38 +0200 | [diff] [blame] | 77 | machine_restart("charging"); |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 78 | } |
Krzysztof Kozlowski | 6ff9d25b | 2015-03-12 08:44:19 +0100 | [diff] [blame] | 79 | power_supply_put(psy); |
Jonas Aaberg | 7c34d7c | 2011-08-17 13:20:21 +0200 | [diff] [blame] | 80 | } |
Lee Jones | 379749c | 2013-01-14 13:26:15 +0000 | [diff] [blame] | 81 | |
Jonas Aaberg | 0903940 | 2011-08-17 15:58:52 +0200 | [diff] [blame] | 82 | shutdown: |
Lee Jones | 379749c | 2013-01-14 13:26:15 +0000 | [diff] [blame] | 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 | |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 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) |
Linus Walleij | 7e9c40c | 2017-01-13 10:53:55 +0100 | [diff] [blame] | 104 | return -EPROBE_DEFER; |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 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 | } |
Jonas Aaberg | c73db9f | 2011-11-11 07:52:10 +0100 | [diff] [blame] | 113 | EXPORT_SYMBOL(ab8500_sysctrl_read); |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 114 | |
| 115 | int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) |
| 116 | { |
| 117 | u8 bank; |
| 118 | |
| 119 | if (sysctrl_dev == NULL) |
Linus Walleij | 7e9c40c | 2017-01-13 10:53:55 +0100 | [diff] [blame] | 120 | return -EPROBE_DEFER; |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 121 | |
| 122 | bank = (reg >> 8); |
Linus Walleij | 7e9c40c | 2017-01-13 10:53:55 +0100 | [diff] [blame] | 123 | if (!valid_bank(bank)) { |
| 124 | pr_err("invalid bank\n"); |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 125 | return -EINVAL; |
Linus Walleij | 7e9c40c | 2017-01-13 10:53:55 +0100 | [diff] [blame] | 126 | } |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 127 | |
| 128 | return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, |
| 129 | (u8)(reg & 0xFF), mask, value); |
| 130 | } |
Jonas Aaberg | c73db9f | 2011-11-11 07:52:10 +0100 | [diff] [blame] | 131 | EXPORT_SYMBOL(ab8500_sysctrl_write); |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 132 | |
Bill Pemberton | f791be4 | 2012-11-19 13:23:04 -0500 | [diff] [blame] | 133 | static int ab8500_sysctrl_probe(struct platform_device *pdev) |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 134 | { |
Fabio Baltieri | 9f7af61 | 2013-04-26 14:17:17 +0200 | [diff] [blame] | 135 | sysctrl_dev = &pdev->dev; |
| 136 | |
Fabio Baltieri | 0b8ebdb | 2013-05-09 13:08:08 +0200 | [diff] [blame] | 137 | if (!pm_power_off) |
Lee Jones | 379749c | 2013-01-14 13:26:15 +0000 | [diff] [blame] | 138 | pm_power_off = ab8500_power_off; |
Kennet Wallden | 1abf063 | 2011-09-27 09:23:56 +0200 | [diff] [blame] | 139 | |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 140 | return 0; |
| 141 | } |
| 142 | |
Bill Pemberton | 4740f73 | 2012-11-19 13:26:01 -0500 | [diff] [blame] | 143 | static int ab8500_sysctrl_remove(struct platform_device *pdev) |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 144 | { |
| 145 | sysctrl_dev = NULL; |
Fabio Baltieri | 0b8ebdb | 2013-05-09 13:08:08 +0200 | [diff] [blame] | 146 | |
| 147 | if (pm_power_off == ab8500_power_off) |
| 148 | pm_power_off = NULL; |
| 149 | |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 150 | return 0; |
| 151 | } |
| 152 | |
Linus Walleij | 7e9c40c | 2017-01-13 10:53:55 +0100 | [diff] [blame] | 153 | static const struct of_device_id ab8500_sysctrl_match[] = { |
| 154 | { .compatible = "stericsson,ab8500-sysctrl", }, |
| 155 | {} |
| 156 | }; |
| 157 | |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 158 | static struct platform_driver ab8500_sysctrl_driver = { |
| 159 | .driver = { |
| 160 | .name = "ab8500-sysctrl", |
Linus Walleij | 7e9c40c | 2017-01-13 10:53:55 +0100 | [diff] [blame] | 161 | .of_match_table = ab8500_sysctrl_match, |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 162 | }, |
| 163 | .probe = ab8500_sysctrl_probe, |
Bill Pemberton | 8444921 | 2012-11-19 13:20:24 -0500 | [diff] [blame] | 164 | .remove = ab8500_sysctrl_remove, |
Mattias Nilsson | 90550d1 | 2011-02-14 11:17:12 +0100 | [diff] [blame] | 165 | }; |
| 166 | |
| 167 | static int __init ab8500_sysctrl_init(void) |
| 168 | { |
| 169 | return platform_driver_register(&ab8500_sysctrl_driver); |
| 170 | } |
Ulf Hansson | caa62d6 | 2013-04-03 01:06:27 +0200 | [diff] [blame] | 171 | arch_initcall(ab8500_sysctrl_init); |