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
8 #include <linux/module.h>
9 #include <linux/platform_device.h>
11 #include <linux/reboot.h>
12 #include <linux/signal.h>
13 #include <linux/power_supply.h>
14 #include <linux/mfd/abx500.h>
15 #include <linux/mfd/abx500/ab8500.h>
16 #include <linux/mfd/abx500/ab8500-sysctrl.h>
19 #define AB8500_ALARM_MIN_LOW 0x08
20 #define AB8500_ALARM_MIN_MID 0x09
22 #define RTC_ALARM_ENABLE 0x4
24 static struct device *sysctrl_dev;
26 static void ab8500_power_off(void)
30 static const char * const pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
32 bool charger_present = false;
33 union power_supply_propval val;
34 struct power_supply *psy;
37 if (sysctrl_dev == NULL) {
38 pr_err("%s: sysctrl not initialized\n", __func__);
43 * If we have a charger connected and we're powering off,
44 * reboot into charge-only mode.
47 for (i = 0; i < ARRAY_SIZE(pss); i++) {
48 psy = power_supply_get_by_name(pss[i]);
52 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
54 power_supply_put(psy);
56 if (!ret && val.intval) {
57 charger_present = true;
65 /* Check if battery is known */
66 psy = power_supply_get_by_name("ab8500_btemp");
68 ret = power_supply_get_property(psy,
69 POWER_SUPPLY_PROP_TECHNOLOGY, &val);
70 if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
71 pr_info("Charger '%s' is connected with known battery",
73 pr_info(" - Rebooting.\n");
74 machine_restart("charging");
76 power_supply_put(psy);
82 if (!sigprocmask(SIG_BLOCK, &all, &old)) {
83 (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
84 AB8500_STW4500CTRL1_SWOFF |
85 AB8500_STW4500CTRL1_SWRESET4500N);
86 (void)sigprocmask(SIG_SETMASK, &old, NULL);
90 static inline bool valid_bank(u8 bank)
92 return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
93 (bank == AB8500_SYS_CTRL2_BLOCK));
96 int ab8500_sysctrl_read(u16 reg, u8 *value)
100 if (sysctrl_dev == NULL)
101 return -EPROBE_DEFER;
104 if (!valid_bank(bank))
107 return abx500_get_register_interruptible(sysctrl_dev, bank,
108 (u8)(reg & 0xFF), value);
110 EXPORT_SYMBOL(ab8500_sysctrl_read);
112 int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
116 if (sysctrl_dev == NULL)
117 return -EPROBE_DEFER;
120 if (!valid_bank(bank)) {
121 pr_err("invalid bank\n");
125 return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
126 (u8)(reg & 0xFF), mask, value);
128 EXPORT_SYMBOL(ab8500_sysctrl_write);
130 static int ab8500_sysctrl_probe(struct platform_device *pdev)
132 sysctrl_dev = &pdev->dev;
135 pm_power_off = ab8500_power_off;
140 static int ab8500_sysctrl_remove(struct platform_device *pdev)
144 if (pm_power_off == ab8500_power_off)
150 static const struct of_device_id ab8500_sysctrl_match[] = {
151 { .compatible = "stericsson,ab8500-sysctrl", },
155 static struct platform_driver ab8500_sysctrl_driver = {
157 .name = "ab8500-sysctrl",
158 .of_match_table = ab8500_sysctrl_match,
160 .probe = ab8500_sysctrl_probe,
161 .remove = ab8500_sysctrl_remove,
164 static int __init ab8500_sysctrl_init(void)
166 return platform_driver_register(&ab8500_sysctrl_driver);
168 arch_initcall(ab8500_sysctrl_init);
170 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
171 MODULE_DESCRIPTION("AB8500 system control driver");
172 MODULE_LICENSE("GPL v2");