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