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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/platform_device.h>
9#include <linux/mfd/ab8500.h>
10#include <linux/mfd/abx500.h>
11#include <linux/mfd/ab8500/sysctrl.h>
12
13static struct device *sysctrl_dev;
14
15static inline bool valid_bank(u8 bank)
16{
17 return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
18 (bank == AB8500_SYS_CTRL2_BLOCK));
19}
20
21int ab8500_sysctrl_read(u16 reg, u8 *value)
22{
23 u8 bank;
24
25 if (sysctrl_dev == NULL)
26 return -EAGAIN;
27
28 bank = (reg >> 8);
29 if (!valid_bank(bank))
30 return -EINVAL;
31
32 return abx500_get_register_interruptible(sysctrl_dev, bank,
33 (u8)(reg & 0xFF), value);
34}
35
36int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
37{
38 u8 bank;
39
40 if (sysctrl_dev == NULL)
41 return -EAGAIN;
42
43 bank = (reg >> 8);
44 if (!valid_bank(bank))
45 return -EINVAL;
46
47 return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
48 (u8)(reg & 0xFF), mask, value);
49}
50
51static int __devinit ab8500_sysctrl_probe(struct platform_device *pdev)
52{
53 sysctrl_dev = &pdev->dev;
54 return 0;
55}
56
57static int __devexit ab8500_sysctrl_remove(struct platform_device *pdev)
58{
59 sysctrl_dev = NULL;
60 return 0;
61}
62
63static struct platform_driver ab8500_sysctrl_driver = {
64 .driver = {
65 .name = "ab8500-sysctrl",
66 .owner = THIS_MODULE,
67 },
68 .probe = ab8500_sysctrl_probe,
69 .remove = __devexit_p(ab8500_sysctrl_remove),
70};
71
72static int __init ab8500_sysctrl_init(void)
73{
74 return platform_driver_register(&ab8500_sysctrl_driver);
75}
76subsys_initcall(ab8500_sysctrl_init);
77
78MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
79MODULE_DESCRIPTION("AB8500 system control driver");
80MODULE_LICENSE("GPL v2");
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
27static struct device *sysctrl_dev;
28
29static 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
82shutdown:
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
93static inline bool valid_bank(u8 bank)
94{
95 return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
96 (bank == AB8500_SYS_CTRL2_BLOCK));
97}
98
99int ab8500_sysctrl_read(u16 reg, u8 *value)
100{
101 u8 bank;
102
103 if (sysctrl_dev == NULL)
104 return -EINVAL;
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}
113EXPORT_SYMBOL(ab8500_sysctrl_read);
114
115int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
116{
117 u8 bank;
118
119 if (sysctrl_dev == NULL)
120 return -EINVAL;
121
122 bank = (reg >> 8);
123 if (!valid_bank(bank))
124 return -EINVAL;
125
126 return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
127 (u8)(reg & 0xFF), mask, value);
128}
129EXPORT_SYMBOL(ab8500_sysctrl_write);
130
131static int ab8500_sysctrl_probe(struct platform_device *pdev)
132{
133 sysctrl_dev = &pdev->dev;
134
135 if (!pm_power_off)
136 pm_power_off = ab8500_power_off;
137
138 return 0;
139}
140
141static int ab8500_sysctrl_remove(struct platform_device *pdev)
142{
143 sysctrl_dev = NULL;
144
145 if (pm_power_off == ab8500_power_off)
146 pm_power_off = NULL;
147
148 return 0;
149}
150
151static struct platform_driver ab8500_sysctrl_driver = {
152 .driver = {
153 .name = "ab8500-sysctrl",
154 },
155 .probe = ab8500_sysctrl_probe,
156 .remove = ab8500_sysctrl_remove,
157};
158
159static int __init ab8500_sysctrl_init(void)
160{
161 return platform_driver_register(&ab8500_sysctrl_driver);
162}
163arch_initcall(ab8500_sysctrl_init);