drm/i915: Wait for LVDS panel power sequence
[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/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");