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 = devm_kzalloc(dev,
  40                                  sizeof(struct abx500_device_entry),
  41                                  GFP_KERNEL);
  42         if (!dev_entry) {
  43                 dev_err(dev, "register_ops kzalloc failed");
  44                 return -ENOMEM;
  45         }
  46         dev_entry->dev = dev;
  47         memcpy(&dev_entry->ops, ops, sizeof(struct abx500_ops));
  48
  49         list_add_tail(&dev_entry->list, &abx500_list);
  50         return 0;
  51 }
  52 EXPORT_SYMBOL(abx500_register_ops);
  53
  54 void abx500_remove_ops(struct device *dev)
  55 {
  56         struct abx500_device_entry *dev_entry, *tmp;
  57
  58         list_for_each_entry_safe(dev_entry, tmp, &abx500_list, list)
  59                 if (dev_entry->dev == dev)
  60                         list_del(&dev_entry->list);
  61 }
  62 EXPORT_SYMBOL(abx500_remove_ops);
  63
  64 int abx500_set_register_interruptible(struct device *dev, u8 bank, u8 reg,
  65         u8 value)
  66 {
  67         struct abx500_ops *ops;
  68
  69         lookup_ops(dev->parent, &ops);
  70         if ((ops != NULL) && (ops->set_register != NULL))
  71                 return ops->set_register(dev, bank, reg, value);
  72         else
  73                 return -ENOTSUPP;
  74 }
  75 EXPORT_SYMBOL(abx500_set_register_interruptible);
  76
  77 int abx500_get_register_interruptible(struct device *dev, u8 bank, u8 reg,
  78         u8 *value)
  79 {
  80         struct abx500_ops *ops;
  81
  82         lookup_ops(dev->parent, &ops);
  83         if ((ops != NULL) && (ops->get_register != NULL))
  84                 return ops->get_register(dev, bank, reg, value);
  85         else
  86                 return -ENOTSUPP;
  87 }
  88 EXPORT_SYMBOL(abx500_get_register_interruptible);
  89
  90 int abx500_get_register_page_interruptible(struct device *dev, u8 bank,
  91         u8 first_reg, u8 *regvals, u8 numregs)
  92 {
  93         struct abx500_ops *ops;
  94
  95         lookup_ops(dev->parent, &ops);
  96         if ((ops != NULL) && (ops->get_register_page != NULL))
  97                 return ops->get_register_page(dev, bank,
  98                         first_reg, regvals, numregs);
  99         else
 100                 return -ENOTSUPP;
 101 }
 102 EXPORT_SYMBOL(abx500_get_register_page_interruptible);
 103
 104 int abx500_mask_and_set_register_interruptible(struct device *dev, u8 bank,
 105         u8 reg, u8 bitmask, u8 bitvalues)
 106 {
 107         struct abx500_ops *ops;
 108
 109         lookup_ops(dev->parent, &ops);
 110         if ((ops != NULL) && (ops->mask_and_set_register != NULL))
 111                 return ops->mask_and_set_register(dev, bank,
 112                         reg, bitmask, bitvalues);
 113         else
 114                 return -ENOTSUPP;
 115 }
 116 EXPORT_SYMBOL(abx500_mask_and_set_register_interruptible);
 117
 118 int abx500_get_chip_id(struct device *dev)
 119 {
 120         struct abx500_ops *ops;
 121
 122         lookup_ops(dev->parent, &ops);
 123         if ((ops != NULL) && (ops->get_chip_id != NULL))
 124                 return ops->get_chip_id(dev);
 125         else
 126                 return -ENOTSUPP;
 127 }
 128 EXPORT_SYMBOL(abx500_get_chip_id);
 129
 130 int abx500_event_registers_startup_state_get(struct device *dev, u8 *event)
 131 {
 132         struct abx500_ops *ops;
 133
 134         lookup_ops(dev->parent, &ops);
 135         if ((ops != NULL) && (ops->event_registers_startup_state_get != NULL))
 136                 return ops->event_registers_startup_state_get(dev, event);
 137         else
 138                 return -ENOTSUPP;
 139 }
 140 EXPORT_SYMBOL(abx500_event_registers_startup_state_get);
 141
 142 int abx500_startup_irq_enabled(struct device *dev, unsigned int irq)
 143 {
 144         struct abx500_ops *ops;
 145
 146         lookup_ops(dev->parent, &ops);
 147         if ((ops != NULL) && (ops->startup_irq_enabled != NULL))
 148                 return ops->startup_irq_enabled(dev, irq);
 149         else
 150                 return -ENOTSUPP;
 151 }
 152 EXPORT_SYMBOL(abx500_startup_irq_enabled);
 153
 154 MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
 155 MODULE_DESCRIPTION("ABX500 core driver");
 156 MODULE_LICENSE("GPL");