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         const char *reg_name;
  30         int bind_count = 0;
  31         ofnode node;
  32         int prefix_len;
  33         int ret;
  34
  35         debug("%s for '%s' at node offset: %d\n", __func__, pmic->name,
  36               dev_of_offset(pmic));
  37
  38         ofnode_for_each_subnode(node, parent) {
  39                 node_name = ofnode_get_name(node);
  40
  41                 debug("* Found child node: '%s'\n", node_name);
  42
  43                 child = NULL;
  44                 for (info = child_info; info->prefix && info->driver; info++) {
  45                         debug("  - compatible prefix: '%s'\n", info->prefix);
  46
  47                         prefix_len = strlen(info->prefix);
  48                         if (strncmp(info->prefix, node_name, prefix_len)) {
  49                                 reg_name = ofnode_read_string(node,
  50                                                               "regulator-name");
  51                                 if (!reg_name)
  52                                         continue;
  53                                 if (strncmp(info->prefix, reg_name, prefix_len))
  54                                         continue;
  55                         }
  56
  57                         drv = lists_driver_lookup_name(info->driver);
  58                         if (!drv) {
  59                                 debug("  - driver: '%s' not found!\n",
  60                                       info->driver);
  61                                 continue;
  62                         }
  63
  64                         debug("  - found child driver: '%s'\n", drv->name);
  65
  66                         ret = device_bind_with_driver_data(pmic, drv, node_name,
  67                                                            0, node, &child);
  68                         if (ret) {
  69                                 debug("  - child binding error: %d\n", ret);
  70                                 continue;
  71                         }
  72
  73                         debug("  - bound child device: '%s'\n", child->name);
  74
  75                         child->driver_data = trailing_strtol(node_name);
  76
  77                         debug("  - set 'child->driver_data': %lu\n",
  78                               child->driver_data);
  79                         break;
  80                 }
  81
  82                 if (child)
  83                         bind_count++;
  84                 else
  85                         debug("  - compatible prefix not found\n");
  86         }
  87
  88         debug("Bound: %d children for PMIC: '%s'\n", bind_count, pmic->name);
  89         return bind_count;
  90 }
  91 #endif
  92
  93 int pmic_get(const char *name, struct udevice **devp)
  94 {
  95         return uclass_get_device_by_name(UCLASS_PMIC, name, devp);
  96 }
  97
  98 int pmic_reg_count(struct udevice *dev)
  99 {
 100         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
 101
 102         if (!ops || !ops->reg_count)
 103                 return -ENOSYS;
 104
 105         return ops->reg_count(dev);
 106 }
 107
 108 int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len)
 109 {
 110         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
 111
 112         if (!buffer)
 113                 return -EFAULT;
 114
 115         if (!ops || !ops->read)
 116                 return -ENOSYS;
 117
 118         return ops->read(dev, reg, buffer, len);
 119 }
 120
 121 int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len)
 122 {
 123         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
 124
 125         if (!buffer)
 126                 return -EFAULT;
 127
 128         if (!ops || !ops->write)
 129                 return -ENOSYS;
 130
 131         return ops->write(dev, reg, buffer, len);
 132 }
 133
 134 int pmic_reg_read(struct udevice *dev, uint reg)
 135 {
 136         u8 byte;
 137         int ret;
 138
 139         debug("%s: reg=%x", __func__, reg);
 140         ret = pmic_read(dev, reg, &byte, 1);
 141         debug(", value=%x, ret=%d\n", byte, ret);
 142
 143         return ret ? ret : byte;
 144 }
 145
 146 int pmic_reg_write(struct udevice *dev, uint reg, uint value)
 147 {
 148         u8 byte = value;
 149         int ret;
 150
 151         debug("%s: reg=%x, value=%x", __func__, reg, value);
 152         ret = pmic_write(dev, reg, &byte, 1);
 153         debug(", ret=%d\n", ret);
 154
 155         return ret;
 156 }
 157
 158 int pmic_clrsetbits(struct udevice *dev, uint reg, uint clr, uint set)
 159 {
 160         u8 byte;
 161         int ret;
 162
 163         ret = pmic_reg_read(dev, reg);
 164         if (ret < 0)
 165                 return ret;
 166         byte = (ret & ~clr) | set;
 167
 168         return pmic_reg_write(dev, reg, byte);
 169 }
 170
 171 UCLASS_DRIVER(pmic) = {
 172         .id             = UCLASS_PMIC,
 173         .name           = "pmic",
 174 };