drivers/mfd/abx500-core.c

   1 /*
   2  * Copyright (C) 2007-2010 ST-Ericsson
   3  * License terms: GNU General Public License (GPL) version 2
   4  * Register access functions for the ABX500 Mixed Signal IC family.
   5  * Author: Mattias Wallin <mattias.wallin@stericsson.com>
   6  */
   7
   8 #include <linux/list.h>
   9 #include <linux/slab.h>
  10 #include <linux/err.h>
  11 #include <linux/module.h>
  12 #include <linux/mfd/abx500.h>
  13
  14 static LIST_HEAD(abx500_list);
  15
  16 struct abx500_device_entry {
  17         struct list_head list;
  18         struct abx500_ops ops;
  19         struct device *dev;
  20 };
  21
  22 static void lookup_ops(struct device *dev, struct abx500_ops **ops)
  23 {
  24         struct abx500_device_entry *dev_entry;
  25
  26         *ops = NULL;
  27         list_for_each_entry(dev_entry, &abx500_list, list) {
  28                 if (dev_entry->dev == dev) {
  29                         *ops = &dev_entry->ops;
  30                         return;
  31                 }
  32         }
  33 }
  34
  35 int abx500_register_ops(struct device *dev, struct abx500_ops *ops)
  36 {
  37         struct abx500_device_entry *dev_entry;
  38
  39         dev_entry = kzalloc(sizeof(struct abx500_device_entry), GFP_KERNEL);
  40         if (!dev_entry) {
  41                 dev_err(dev, "register_ops kzalloc failed");
  42                 return -ENOMEM;
  43         }
  44         dev_entry->dev = dev;
  45         memcpy(&dev_entry->ops, ops, sizeof(struct abx500_ops));
  46
  47         list_add_tail(&dev_entry->list, &abx500_list);
  48         return 0;
  49 }
  50 EXPORT_SYMBOL(abx500_register_ops);
  51
  52 void abx500_remove_ops(struct device *dev)
  53 {
  54         struct abx500_device_entry *dev_entry, *tmp;
  55
  56         list_for_each_entry_safe(dev_entry, tmp, &abx500_list, list)
  57         {
  58                 if (dev_entry->dev == dev) {
  59                         list_del(&dev_entry->list);
  60                         kfree(dev_entry);
  61                 }
  62         }
  63 }
  64 EXPORT_SYMBOL(abx500_remove_ops);
  65
  66 int abx500_set_register_interruptible(struct device *dev, u8 bank, u8 reg,
  67         u8 value)
  68 {
  69         struct abx500_ops *ops;
  70
  71         lookup_ops(dev->parent, &ops);
  72         if ((ops != NULL) && (ops->set_register != NULL))
  73                 return ops->set_register(dev, bank, reg, value);
  74         else
  75                 return -ENOTSUPP;
  76 }
  77 EXPORT_SYMBOL(abx500_set_register_interruptible);
  78
  79 int abx500_get_register_interruptible(struct device *dev, u8 bank, u8 reg,
  80         u8 *value)
  81 {
  82         struct abx500_ops *ops;
  83
  84         lookup_ops(dev->parent, &ops);
  85         if ((ops != NULL) && (ops->get_register != NULL))
  86                 return ops->get_register(dev, bank, reg, value);
  87         else
  88                 return -ENOTSUPP;
  89 }
  90 EXPORT_SYMBOL(abx500_get_register_interruptible);
  91
  92 int abx500_get_register_page_interruptible(struct device *dev, u8 bank,
  93         u8 first_reg, u8 *regvals, u8 numregs)
  94 {
  95         struct abx500_ops *ops;
  96
  97         lookup_ops(dev->parent, &ops);
  98         if ((ops != NULL) && (ops->get_register_page != NULL))
  99                 return ops->get_register_page(dev, bank,
 100                         first_reg, regvals, numregs);
 101         else
 102                 return -ENOTSUPP;
 103 }
 104 EXPORT_SYMBOL(abx500_get_register_page_interruptible);
 105
 106 int abx500_mask_and_set_register_interruptible(struct device *dev, u8 bank,
 107         u8 reg, u8 bitmask, u8 bitvalues)
 108 {
 109         struct abx500_ops *ops;
 110
 111         lookup_ops(dev->parent, &ops);
 112         if ((ops != NULL) && (ops->mask_and_set_register != NULL))
 113                 return ops->mask_and_set_register(dev, bank,
 114                         reg, bitmask, bitvalues);
 115         else
 116                 return -ENOTSUPP;
 117 }
 118 EXPORT_SYMBOL(abx500_mask_and_set_register_interruptible);
 119
 120 int abx500_get_chip_id(struct device *dev)
 121 {
 122         struct abx500_ops *ops;
 123
 124         lookup_ops(dev->parent, &ops);
 125         if ((ops != NULL) && (ops->get_chip_id != NULL))
 126                 return ops->get_chip_id(dev);
 127         else
 128                 return -ENOTSUPP;
 129 }
 130 EXPORT_SYMBOL(abx500_get_chip_id);
 131
 132 int abx500_event_registers_startup_state_get(struct device *dev, u8 *event)
 133 {
 134         struct abx500_ops *ops;
 135
 136         lookup_ops(dev->parent, &ops);
 137         if ((ops != NULL) && (ops->event_registers_startup_state_get != NULL))
 138                 return ops->event_registers_startup_state_get(dev, event);
 139         else
 140                 return -ENOTSUPP;
 141 }
 142 EXPORT_SYMBOL(abx500_event_registers_startup_state_get);
 143
 144 int abx500_startup_irq_enabled(struct device *dev, unsigned int irq)
 145 {
 146         struct abx500_ops *ops;
 147
 148         lookup_ops(dev->parent, &ops);
 149         if ((ops != NULL) && (ops->startup_irq_enabled != NULL))
 150                 return ops->startup_irq_enabled(dev, irq);
 151         else
 152                 return -ENOTSUPP;
 153 }
 154 EXPORT_SYMBOL(abx500_startup_irq_enabled);
 155
 156 MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
 157 MODULE_DESCRIPTION("ABX500 core driver");
 158 MODULE_LICENSE("GPL");