linux/drivers/mfd/ab8500-sysctrl.c
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   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/abx500.h>
  11#include <linux/mfd/abx500/ab8500.h>
  12#include <linux/mfd/abx500/ab8500-sysctrl.h>
  13
  14static struct device *sysctrl_dev;
  15
  16static inline bool valid_bank(u8 bank)
  17{
  18        return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
  19                (bank == AB8500_SYS_CTRL2_BLOCK));
  20}
  21
  22int 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
  37int 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
  52static int ab8500_sysctrl_probe(struct platform_device *pdev)
  53{
  54        sysctrl_dev = &pdev->dev;
  55        return 0;
  56}
  57
  58static int ab8500_sysctrl_remove(struct platform_device *pdev)
  59{
  60        sysctrl_dev = NULL;
  61        return 0;
  62}
  63
  64static struct platform_driver ab8500_sysctrl_driver = {
  65        .driver = {
  66                .name = "ab8500-sysctrl",
  67                .owner = THIS_MODULE,
  68        },
  69        .probe = ab8500_sysctrl_probe,
  70        .remove = ab8500_sysctrl_remove,
  71};
  72
  73static int __init ab8500_sysctrl_init(void)
  74{
  75        return platform_driver_register(&ab8500_sysctrl_driver);
  76}
  77subsys_initcall(ab8500_sysctrl_init);
  78
  79MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
  80MODULE_DESCRIPTION("AB8500 system control driver");
  81MODULE_LICENSE("GPL v2");
  82
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