drivers/power/pmic/act8846.c

   1 /*
   2  * Copyright (C) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <fdtdec.h>
  12 #include <linux/libfdt.h>
  13 #include <power/act8846_pmic.h>
  14 #include <power/pmic.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 static const struct pmic_child_info pmic_children_info[] = {
  19         { .prefix = "REG", .driver = "act8846_reg"},
  20         { },
  21 };
  22
  23 static int act8846_reg_count(struct udevice *dev)
  24 {
  25         return ACT8846_NUM_OF_REGS;
  26 }
  27
  28 static int act8846_write(struct udevice *dev, uint reg, const uint8_t *buff,
  29                           int len)
  30 {
  31         if (dm_i2c_write(dev, reg, buff, len)) {
  32                 debug("write error to device: %p register: %#x!\n", dev, reg);
  33                 return -EIO;
  34         }
  35
  36         return 0;
  37 }
  38
  39 static int act8846_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  40 {
  41         if (dm_i2c_read(dev, reg, buff, len)) {
  42                 debug("read error from device: %p register: %#x!\n", dev, reg);
  43                 return -EIO;
  44         }
  45
  46         return 0;
  47 }
  48
  49 static int act8846_bind(struct udevice *dev)
  50 {
  51         ofnode regulators_node;
  52         int children;
  53
  54         regulators_node = dev_read_subnode(dev, "regulators");
  55         if (!ofnode_valid(regulators_node)) {
  56                 debug("%s: %s regulators subnode not found!", __func__,
  57                       dev->name);
  58                 return -ENXIO;
  59         }
  60
  61         debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
  62
  63         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
  64         if (!children)
  65                 debug("%s: %s - no child found\n", __func__, dev->name);
  66
  67         /* Always return success for this device */
  68         return 0;
  69 }
  70
  71 static struct dm_pmic_ops act8846_ops = {
  72         .reg_count = act8846_reg_count,
  73         .read = act8846_read,
  74         .write = act8846_write,
  75 };
  76
  77 static const struct udevice_id act8846_ids[] = {
  78         { .compatible = "active-semi,act8846" },
  79         { }
  80 };
  81
  82 U_BOOT_DRIVER(pmic_act8846) = {
  83         .name = "act8846 pmic",
  84         .id = UCLASS_PMIC,
  85         .of_match = act8846_ids,
  86         .bind = act8846_bind,
  87         .ops = &act8846_ops,
  88 };