drivers/power/pmic/pmic-uclass.c

   1 /*
   2  * Copyright (C) 2014-2015 Samsung Electronics
   3  * Przemyslaw Marczak <p.marczak@samsung.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <fdtdec.h>
  10 #include <errno.h>
  11 #include <dm.h>
  12 #include <vsprintf.h>
  13 #include <dm/lists.h>
  14 #include <dm/device-internal.h>
  15 #include <dm/uclass-internal.h>
  16 #include <power/pmic.h>
  17 #include <linux/ctype.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
  22 int pmic_bind_children(struct udevice *pmic, ofnode parent,
  23                        const struct pmic_child_info *child_info)
  24 {
  25         const struct pmic_child_info *info;
  26         struct driver *drv;
  27         struct udevice *child;
  28         const char *node_name;
  29         int bind_count = 0;
  30         ofnode node;
  31         int prefix_len;
  32         int ret;
  33
  34         debug("%s for '%s' at node offset: %d\n", __func__, pmic->name,
  35               dev_of_offset(pmic));
  36
  37         for (node = ofnode_first_subnode(parent);
  38              ofnode_valid(node);
  39              node = ofnode_next_subnode(node)) {
  40                 node_name = ofnode_get_name(node);
  41
  42                 debug("* Found child node: '%s'\n", node_name);
  43
  44                 child = NULL;
  45                 for (info = child_info; info->prefix && info->driver; info++) {
  46                         debug("  - compatible prefix: '%s'\n", info->prefix);
  47
  48                         prefix_len = strlen(info->prefix);
  49                         if (strncmp(info->prefix, node_name, prefix_len))
  50                                 continue;
  51
  52                         drv = lists_driver_lookup_name(info->driver);
  53                         if (!drv) {
  54                                 debug("  - driver: '%s' not found!\n",
  55                                       info->driver);
  56                                 continue;
  57                         }
  58
  59                         debug("  - found child driver: '%s'\n", drv->name);
  60
  61                         ret = device_bind_with_driver_data(pmic, drv, node_name,
  62                                                            0, node, &child);
  63                         if (ret) {
  64                                 debug("  - child binding error: %d\n", ret);
  65                                 continue;
  66                         }
  67
  68                         debug("  - bound child device: '%s'\n", child->name);
  69
  70                         child->driver_data = trailing_strtol(node_name);
  71
  72                         debug("  - set 'child->driver_data': %lu\n",
  73                               child->driver_data);
  74                         break;
  75                 }
  76
  77                 if (child)
  78                         bind_count++;
  79                 else
  80                         debug("  - compatible prefix not found\n");
  81         }
  82
  83         debug("Bound: %d children for PMIC: '%s'\n", bind_count, pmic->name);
  84         return bind_count;
  85 }
  86 #endif
  87
  88 int pmic_get(const char *name, struct udevice **devp)
  89 {
  90         return uclass_get_device_by_name(UCLASS_PMIC, name, devp);
  91 }
  92
  93 int pmic_reg_count(struct udevice *dev)
  94 {
  95         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
  96
  97         if (!ops || !ops->reg_count)
  98                 return -ENOSYS;
  99
 100         return ops->reg_count(dev);
 101 }
 102
 103 int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len)
 104 {
 105         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
 106
 107         if (!buffer)
 108                 return -EFAULT;
 109
 110         if (!ops || !ops->read)
 111                 return -ENOSYS;
 112
 113         return ops->read(dev, reg, buffer, len);
 114 }
 115
 116 int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len)
 117 {
 118         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
 119
 120         if (!buffer)
 121                 return -EFAULT;
 122
 123         if (!ops || !ops->write)
 124                 return -ENOSYS;
 125
 126         return ops->write(dev, reg, buffer, len);
 127 }
 128
 129 int pmic_reg_read(struct udevice *dev, uint reg)
 130 {
 131         u8 byte;
 132         int ret;
 133
 134         debug("%s: reg=%x", __func__, reg);
 135         ret = pmic_read(dev, reg, &byte, 1);
 136         debug(", value=%x, ret=%d\n", byte, ret);
 137
 138         return ret ? ret : byte;
 139 }
 140
 141 int pmic_reg_write(struct udevice *dev, uint reg, uint value)
 142 {
 143         u8 byte = value;
 144         int ret;
 145
 146         debug("%s: reg=%x, value=%x", __func__, reg, value);
 147         ret = pmic_write(dev, reg, &byte, 1);
 148         debug(", ret=%d\n", ret);
 149
 150         return ret;
 151 }
 152
 153 int pmic_clrsetbits(struct udevice *dev, uint reg, uint clr, uint set)
 154 {
 155         u8 byte;
 156         int ret;
 157
 158         ret = pmic_reg_read(dev, reg);
 159         if (ret < 0)
 160                 return ret;
 161         byte = (ret & ~clr) | set;
 162
 163         return pmic_reg_write(dev, reg, byte);
 164 }
 165
 166 UCLASS_DRIVER(pmic) = {
 167         .id             = UCLASS_PMIC,
 168         .name           = "pmic",
 169 };