net: mscc: ocelot: cross-check the sequence id from the timestamp FIFO with the skb...
[linux-2.6-microblaze.git] / drivers / mfd / ab8500-sysctrl.c
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(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);