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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> |
90550d19 | 10 | #include <linux/mfd/abx500.h> |
ee66e653 LW |
11 | #include <linux/mfd/abx500/ab8500.h> |
12 | #include <linux/mfd/abx500/ab8500-sysctrl.h> | |
90550d19 MN |
13 | |
14 | static struct device *sysctrl_dev; | |
15 | ||
16 | static inline bool valid_bank(u8 bank) | |
17 | { | |
18 | return ((bank == AB8500_SYS_CTRL1_BLOCK) || | |
19 | (bank == AB8500_SYS_CTRL2_BLOCK)); | |
20 | } | |
21 | ||
22 | int ab8500_sysctrl_read(u16 reg, u8 *value) | |
23 | { | |
24 | u8 bank; | |
25 | ||
26 | if (sysctrl_dev == NULL) | |
27 | return -EAGAIN; | |
28 | ||
29 | bank = (reg >> 8); | |
30 | if (!valid_bank(bank)) | |
31 | return -EINVAL; | |
32 | ||
33 | return abx500_get_register_interruptible(sysctrl_dev, bank, | |
34 | (u8)(reg & 0xFF), value); | |
35 | } | |
36 | ||
37 | int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value) | |
38 | { | |
39 | u8 bank; | |
40 | ||
41 | if (sysctrl_dev == NULL) | |
42 | return -EAGAIN; | |
43 | ||
44 | bank = (reg >> 8); | |
45 | if (!valid_bank(bank)) | |
46 | return -EINVAL; | |
47 | ||
48 | return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank, | |
49 | (u8)(reg & 0xFF), mask, value); | |
50 | } | |
51 | ||
f791be49 | 52 | static int ab8500_sysctrl_probe(struct platform_device *pdev) |
90550d19 MN |
53 | { |
54 | sysctrl_dev = &pdev->dev; | |
55 | return 0; | |
56 | } | |
57 | ||
4740f73f | 58 | static int ab8500_sysctrl_remove(struct platform_device *pdev) |
90550d19 MN |
59 | { |
60 | sysctrl_dev = NULL; | |
61 | return 0; | |
62 | } | |
63 | ||
64 | static struct platform_driver ab8500_sysctrl_driver = { | |
65 | .driver = { | |
66 | .name = "ab8500-sysctrl", | |
67 | .owner = THIS_MODULE, | |
68 | }, | |
69 | .probe = ab8500_sysctrl_probe, | |
84449216 | 70 | .remove = ab8500_sysctrl_remove, |
90550d19 MN |
71 | }; |
72 | ||
73 | static int __init ab8500_sysctrl_init(void) | |
74 | { | |
75 | return platform_driver_register(&ab8500_sysctrl_driver); | |
76 | } | |
77 | subsys_initcall(ab8500_sysctrl_init); | |
78 | ||
79 | MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com"); | |
80 | MODULE_DESCRIPTION("AB8500 system control driver"); | |
81 | MODULE_LICENSE("GPL v2"); |