mfd: Convert 88pm860x to use regmap api
[linux-2.6.git] / drivers / mfd / ab8500-sysctrl.c
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/mfd/ab8500.h>
11 #include <linux/mfd/abx500.h>
12 #include <linux/mfd/ab8500/sysctrl.h>
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
52 static int __devinit ab8500_sysctrl_probe(struct platform_device *pdev)
53 {
54         sysctrl_dev = &pdev->dev;
55         return 0;
56 }
57
58 static int __devexit ab8500_sysctrl_remove(struct platform_device *pdev)
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,
70         .remove = __devexit_p(ab8500_sysctrl_remove),
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");