1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * AB8500 system control driver |
4 | * |
5 | * Copyright (C) ST-Ericsson SA 2010 |
6 | * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. |
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(name: pss[i]); |
52 | if (!psy) |
53 | continue; |
54 | |
55 | ret = power_supply_get_property(psy, psp: POWER_SUPPLY_PROP_ONLINE, |
56 | val: &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(name: "ab8500_btemp" ); |
70 | if (psy) { |
71 | ret = power_supply_get_property(psy, |
72 | psp: POWER_SUPPLY_PROP_TECHNOLOGY, val: &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(cmd: "charging" ); |
78 | } |
79 | power_supply_put(psy); |
80 | } |
81 | |
82 | shutdown: |
83 | sigfillset(set: &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(dev: sysctrl_dev, bank, |
111 | reg: (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(dev: sysctrl_dev, bank, |
129 | reg: (u8)(reg & 0xFF), bitmask: mask, bitvalues: 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); |
172 | |