Eric Lee / smarc-fsl-linux-kernel

Blame view

drivers/mfd/ab8500-sysctrl.c 1.75 KB
edit raw normal view history
90550d190   Mattias Nilsson   mfd: AB8500 syste... 
1
2
3
4
5
6
7
 
  /*
   * Copyright (C) ST-Ericsson SA 2010
   * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
   * License terms: GNU General Public License (GPL) version 2
   */
  
  #include <linux/err.h>
4e36dd331   Paul Gortmaker   mfd: Add module.h... 
8
 
  #include <linux/module.h>
90550d190   Mattias Nilsson   mfd: AB8500 syste... 
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
 
  #include <linux/platform_device.h>
  #include <linux/mfd/ab8500.h>
  #include <linux/mfd/abx500.h>
  #include <linux/mfd/ab8500/sysctrl.h>
  
  static struct device *sysctrl_dev;
  
  static inline bool valid_bank(u8 bank)
  {
  	return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
  		(bank == AB8500_SYS_CTRL2_BLOCK));
  }
  
  int ab8500_sysctrl_read(u16 reg, u8 *value)
  {
  	u8 bank;
  
  	if (sysctrl_dev == NULL)
  		return -EAGAIN;
  
  	bank = (reg >> 8);
  	if (!valid_bank(bank))
  		return -EINVAL;
  
  	return abx500_get_register_interruptible(sysctrl_dev, bank,
  		(u8)(reg & 0xFF), value);
  }
  
  int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
  {
  	u8 bank;
  
  	if (sysctrl_dev == NULL)
  		return -EAGAIN;
  
  	bank = (reg >> 8);
  	if (!valid_bank(bank))
  		return -EINVAL;
  
  	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
  		(u8)(reg & 0xFF), mask, value);
  }
  
  static int __devinit ab8500_sysctrl_probe(struct platform_device *pdev)
  {
  	sysctrl_dev = &pdev->dev;
  	return 0;
  }
  
  static int __devexit ab8500_sysctrl_remove(struct platform_device *pdev)
  {
  	sysctrl_dev = NULL;
  	return 0;
  }
  
  static struct platform_driver ab8500_sysctrl_driver = {
  	.driver = {
  		.name = "ab8500-sysctrl",
  		.owner = THIS_MODULE,
  	},
  	.probe = ab8500_sysctrl_probe,
  	.remove = __devexit_p(ab8500_sysctrl_remove),
  };
  
  static int __init ab8500_sysctrl_init(void)
  {
  	return platform_driver_register(&ab8500_sysctrl_driver);
  }
  subsys_initcall(ab8500_sysctrl_init);
  
  MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
  MODULE_DESCRIPTION("AB8500 system control driver");
  MODULE_LICENSE("GPL v2");