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90550d19 MN |
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> | |
4e36dd33 | 8 | #include <linux/module.h> |
90550d19 | 9 | #include <linux/platform_device.h> |
379749c4 | 10 | #include <linux/pm.h> |
7c34d7c2 | 11 | #include <linux/reboot.h> |
379749c4 | 12 | #include <linux/signal.h> |
7c34d7c2 | 13 | #include <linux/power_supply.h> |
90550d19 | 14 | #include <linux/mfd/abx500.h> |
ee66e653 LW |
15 | #include <linux/mfd/abx500/ab8500.h> |
16 | #include <linux/mfd/abx500/ab8500-sysctrl.h> | |
90550d19 MN |
17 | |
18 | static struct device *sysctrl_dev; | |
19 | ||
379749c4 LJ |
20 | void ab8500_power_off(void) |
21 | { | |
22 | sigset_t old; | |
23 | sigset_t all; | |
7c34d7c2 JA |
24 | static char *pss[] = {"ab8500_ac", "ab8500_usb"}; |
25 | int i; | |
0903940d JA |
26 | bool charger_present = false; |
27 | union power_supply_propval val; | |
28 | struct power_supply *psy; | |
29 | int ret; | |
7c34d7c2 JA |
30 | |
31 | /* | |
32 | * If we have a charger connected and we're powering off, | |
33 | * reboot into charge-only mode. | |
34 | */ | |
35 | ||
36 | for (i = 0; i < ARRAY_SIZE(pss); i++) { | |
7c34d7c2 JA |
37 | psy = power_supply_get_by_name(pss[i]); |
38 | if (!psy) | |
39 | continue; | |
0903940d | 40 | |
7c34d7c2 JA |
41 | ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val); |
42 | ||
43 | if (!ret && val.intval) { | |
0903940d JA |
44 | charger_present = true; |
45 | break; | |
46 | } | |
47 | } | |
48 | ||
49 | if (!charger_present) | |
50 | goto shutdown; | |
51 | ||
52 | /* Check if battery is known */ | |
53 | psy = power_supply_get_by_name("ab8500_btemp"); | |
54 | if (psy) { | |
55 | ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY, | |
56 | &val); | |
57 | if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) { | |
7c34d7c2 | 58 | printk(KERN_INFO |
0903940d JA |
59 | "Charger \"%s\" is connected with known battery." |
60 | " Rebooting.\n", | |
7c34d7c2 | 61 | pss[i]); |
5a4bac6e | 62 | machine_restart("charging"); |
7c34d7c2 JA |
63 | } |
64 | } | |
379749c4 | 65 | |
0903940d | 66 | shutdown: |
379749c4 LJ |
67 | sigfillset(&all); |
68 | ||
69 | if (!sigprocmask(SIG_BLOCK, &all, &old)) { | |
70 | (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1, | |
71 | AB8500_STW4500CTRL1_SWOFF | | |
72 | AB8500_STW4500CTRL1_SWRESET4500N); | |
73 | (void)sigprocmask(SIG_SETMASK, &old, NULL); | |
74 | } | |
75 | } | |
76 | ||
90550d19 MN |
77 | static inline bool valid_bank(u8 bank) |
78 | { | |
79 | return ((bank == AB8500_SYS_CTRL1_BLOCK) || | |
80 | (bank == AB8500_SYS_CTRL2_BLOCK)); | |
81 | } | |
82 | ||
83 | int ab8500_sysctrl_read(u16 reg, u8 *value) | |
84 | { | |
85 | u8 bank; | |
86 | ||
87 | if (sysctrl_dev == NULL) | |
88 | return -EAGAIN; | |
89 | ||
90 | bank = (reg >> 8); | |
91 | if (!valid_bank(bank)) | |
92 | return -EINVAL; | |
93 | ||
94 | return abx500_get_register_interruptible(sysctrl_dev, bank, | |
95 | (u8)(reg & 0xFF), value); | |
96 | } | |
97 | ||
98 | int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) | |
99 | { | |
100 | u8 bank; | |
101 | ||
102 | if (sysctrl_dev == NULL) | |
103 | return -EAGAIN; | |
104 | ||
105 | bank = (reg >> 8); | |
106 | if (!valid_bank(bank)) | |
107 | return -EINVAL; | |
108 | ||
109 | return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, | |
110 | (u8)(reg & 0xFF), mask, value); | |
111 | } | |
112 | ||
f791be49 | 113 | static int ab8500_sysctrl_probe(struct platform_device *pdev) |
90550d19 | 114 | { |
379749c4 LJ |
115 | struct ab8500_platform_data *plat; |
116 | ||
90550d19 | 117 | sysctrl_dev = &pdev->dev; |
379749c4 LJ |
118 | plat = dev_get_platdata(pdev->dev.parent); |
119 | if (plat->pm_power_off) | |
120 | pm_power_off = ab8500_power_off; | |
90550d19 MN |
121 | return 0; |
122 | } | |
123 | ||
4740f73f | 124 | static int ab8500_sysctrl_remove(struct platform_device *pdev) |
90550d19 MN |
125 | { |
126 | sysctrl_dev = NULL; | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static struct platform_driver ab8500_sysctrl_driver = { | |
131 | .driver = { | |
132 | .name = "ab8500-sysctrl", | |
133 | .owner = THIS_MODULE, | |
134 | }, | |
135 | .probe = ab8500_sysctrl_probe, | |
84449216 | 136 | .remove = ab8500_sysctrl_remove, |
90550d19 MN |
137 | }; |
138 | ||
139 | static int __init ab8500_sysctrl_init(void) | |
140 | { | |
141 | return platform_driver_register(&ab8500_sysctrl_driver); | |
142 | } | |
143 | subsys_initcall(ab8500_sysctrl_init); | |
144 | ||
145 | MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com"); | |
146 | MODULE_DESCRIPTION("AB8500 system control driver"); | |
147 | MODULE_LICENSE("GPL v2"); |