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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/module.h> |
9 | #include <linux/platform_device.h> |
10 | #include <linux/pm.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> |
17 | |
18 | static struct device *sysctrl_dev; |
19 | |
20 | void ab8500_power_off(void) |
21 | { |
22 | sigset_t old; |
23 | sigset_t all; |
24 | static char *pss[] = {"ab8500_ac", "ab8500_usb"}; |
25 | int i; |
26 | bool charger_present = false; |
27 | union power_supply_propval val; |
28 | struct power_supply *psy; |
29 | int ret; |
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++) { |
37 | psy = power_supply_get_by_name(pss[i]); |
38 | if (!psy) |
39 | continue; |
40 | |
41 | ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val); |
42 | |
43 | if (!ret && val.intval) { |
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) { |
58 | printk(KERN_INFO |
59 | "Charger \"%s\" is connected with known battery." |
60 | " Rebooting.\n", |
61 | pss[i]); |
62 | machine_restart("charging"); |
63 | } |
64 | } |
65 | |
66 | shutdown: |
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 | |
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 | EXPORT_SYMBOL(ab8500_sysctrl_read); |
98 | |
99 | int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) |
100 | { |
101 | u8 bank; |
102 | |
103 | if (sysctrl_dev == NULL) |
104 | return -EAGAIN; |
105 | |
106 | bank = (reg >> 8); |
107 | if (!valid_bank(bank)) |
108 | return -EINVAL; |
109 | |
110 | return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, |
111 | (u8)(reg & 0xFF), mask, value); |
112 | } |
113 | EXPORT_SYMBOL(ab8500_sysctrl_write); |
114 | |
115 | static int ab8500_sysctrl_probe(struct platform_device *pdev) |
116 | { |
117 | struct ab8500_platform_data *plat; |
118 | struct ab8500_sysctrl_platform_data *pdata; |
119 | |
120 | sysctrl_dev = &pdev->dev; |
121 | plat = dev_get_platdata(pdev->dev.parent); |
122 | if (plat->pm_power_off) |
123 | pm_power_off = ab8500_power_off; |
124 | |
125 | pdata = plat->sysctrl; |
126 | |
127 | if (pdata) { |
128 | int ret, i, j; |
129 | |
130 | for (i = AB8500_SYSCLKREQ1RFCLKBUF; |
131 | i <= AB8500_SYSCLKREQ8RFCLKBUF; i++) { |
132 | j = i - AB8500_SYSCLKREQ1RFCLKBUF; |
133 | ret = ab8500_sysctrl_write(i, 0xff, |
134 | pdata->initial_req_buf_config[j]); |
135 | dev_dbg(&pdev->dev, |
136 | "Setting SysClkReq%dRfClkBuf 0x%X\n", |
137 | j + 1, |
138 | pdata->initial_req_buf_config[j]); |
139 | if (ret < 0) { |
140 | dev_err(&pdev->dev, |
141 | "unable to set sysClkReq%dRfClkBuf: " |
142 | "%d\n", j + 1, ret); |
143 | } |
144 | } |
145 | } |
146 | |
147 | return 0; |
148 | } |
149 | |
150 | static int ab8500_sysctrl_remove(struct platform_device *pdev) |
151 | { |
152 | sysctrl_dev = NULL; |
153 | return 0; |
154 | } |
155 | |
156 | static struct platform_driver ab8500_sysctrl_driver = { |
157 | .driver = { |
158 | .name = "ab8500-sysctrl", |
159 | .owner = THIS_MODULE, |
160 | }, |
161 | .probe = ab8500_sysctrl_probe, |
162 | .remove = ab8500_sysctrl_remove, |
163 | }; |
164 | |
165 | static int __init ab8500_sysctrl_init(void) |
166 | { |
167 | return platform_driver_register(&ab8500_sysctrl_driver); |
168 | } |
169 | subsys_initcall(ab8500_sysctrl_init); |
170 | |
171 | MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com"); |
172 | MODULE_DESCRIPTION("AB8500 system control driver"); |
173 | MODULE_LICENSE("GPL v2"); |
174 |
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