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, int offset,
  23                        const struct pmic_child_info *child_info)
  24 {
  25         const struct pmic_child_info *info;
  26         const void *blob = gd->fdt_blob;
  27         struct driver *drv;
  28         struct udevice *child;
  29         const char *node_name;
  30         int bind_count = 0;
  31         int 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         for (node = fdt_first_subnode(blob, offset);
  39              node > 0;
  40              node = fdt_next_subnode(blob, node)) {
  41                 node_name = fdt_get_name(blob, node, NULL);
  42
  43                 debug("* Found child node: '%s' at offset:%d\n", node_name,
  44                                                                  node);
  45
  46                 child = NULL;
  47                 for (info = child_info; info->prefix && info->driver; info++) {
  48                         debug("  - compatible prefix: '%s'\n", info->prefix);
  49
  50                         prefix_len = strlen(info->prefix);
  51                         if (strncmp(info->prefix, node_name, prefix_len))
  52                                 continue;
  53
  54                         drv = lists_driver_lookup_name(info->driver);
  55                         if (!drv) {
  56                                 debug("  - driver: '%s' not found!\n",
  57                                       info->driver);
  58                                 continue;
  59                         }
  60
  61                         debug("  - found child driver: '%s'\n", drv->name);
  62
  63                         ret = device_bind(pmic, drv, node_name, NULL,
  64                                           node, &child);
  65                         if (ret) {
  66                                 debug("  - child binding error: %d\n", ret);
  67                                 continue;
  68                         }
  69
  70                         debug("  - bound child device: '%s'\n", child->name);
  71
  72                         child->driver_data = trailing_strtol(node_name);
  73
  74                         debug("  - set 'child->driver_data': %lu\n",
  75                               child->driver_data);
  76                         break;
  77                 }
  78
  79                 if (child)
  80                         bind_count++;
  81                 else
  82                         debug("  - compatible prefix not found\n");
  83         }
  84
  85         debug("Bound: %d childs for PMIC: '%s'\n", bind_count, pmic->name);
  86         return bind_count;
  87 }
  88 #endif
  89
  90 int pmic_get(const char *name, struct udevice **devp)
  91 {
  92         return uclass_get_device_by_name(UCLASS_PMIC, name, devp);
  93 }
  94
  95 int pmic_reg_count(struct udevice *dev)
  96 {
  97         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
  98
  99         if (!ops || !ops->reg_count)
 100                 return -ENOSYS;
 101
 102         return ops->reg_count(dev);
 103 }
 104
 105 int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len)
 106 {
 107         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
 108
 109         if (!buffer)
 110                 return -EFAULT;
 111
 112         if (!ops || !ops->read)
 113                 return -ENOSYS;
 114
 115         return ops->read(dev, reg, buffer, len);
 116 }
 117
 118 int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len)
 119 {
 120         const struct dm_pmic_ops *ops = dev_get_driver_ops(dev);
 121
 122         if (!buffer)
 123                 return -EFAULT;
 124
 125         if (!ops || !ops->write)
 126                 return -ENOSYS;
 127
 128         return ops->write(dev, reg, buffer, len);
 129 }
 130
 131 int pmic_reg_read(struct udevice *dev, uint reg)
 132 {
 133         u8 byte;
 134         int ret;
 135
 136         debug("%s: reg=%x", __func__, reg);
 137         ret = pmic_read(dev, reg, &byte, 1);
 138         debug(", value=%x, ret=%d\n", byte, ret);
 139
 140         return ret ? ret : byte;
 141 }
 142
 143 int pmic_reg_write(struct udevice *dev, uint reg, uint value)
 144 {
 145         u8 byte = value;
 146         int ret;
 147
 148         debug("%s: reg=%x, value=%x", __func__, reg, value);
 149         ret = pmic_write(dev, reg, &byte, 1);
 150         debug(", ret=%d\n", ret);
 151
 152         return ret;
 153 }
 154
 155 int pmic_clrsetbits(struct udevice *dev, uint reg, uint clr, uint set)
 156 {
 157         u8 byte;
 158         int ret;
 159
 160         ret = pmic_reg_read(dev, reg);
 161         if (ret < 0)
 162                 return ret;
 163         byte = (ret & ~clr) | set;
 164
 165         return pmic_reg_write(dev, reg, byte);
 166 }
 167
 168 UCLASS_DRIVER(pmic) = {
 169         .id             = UCLASS_PMIC,
 170         .name           = "pmic",
 171 };