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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> | |
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 | ||
13 | static struct device *sysctrl_dev; | |
14 | ||
15 | static inline bool valid_bank(u8 bank) | |
16 | { | |
17 | return ((bank == AB8500_SYS_CTRL1_BLOCK) || | |
18 | (bank == AB8500_SYS_CTRL2_BLOCK)); | |
19 | } | |
20 | ||
21 | int 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 | ||
36 | int 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 | ||
51 | static int __devinit ab8500_sysctrl_probe(struct platform_device *pdev) | |
52 | { | |
53 | sysctrl_dev = &pdev->dev; | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static int __devexit ab8500_sysctrl_remove(struct platform_device *pdev) | |
58 | { | |
59 | sysctrl_dev = NULL; | |
60 | return 0; | |
61 | } | |
62 | ||
63 | static 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 | ||
72 | static int __init ab8500_sysctrl_init(void) | |
73 | { | |
74 | return platform_driver_register(&ab8500_sysctrl_driver); | |
75 | } | |
76 | subsys_initcall(ab8500_sysctrl_init); | |
77 | ||
78 | MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com"); | |
79 | MODULE_DESCRIPTION("AB8500 system control driver"); | |
80 | MODULE_LICENSE("GPL v2"); |