drivers/power/pmic/pm8916.c

   1 /*
   2  * Qualcomm pm8916 pmic driver
   3  *
   4  * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <dm/root.h>
  11 #include <power/pmic.h>
  12 #include <spmi/spmi.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 #define PID_SHIFT 8
  17 #define PID_MASK (0xFF << PID_SHIFT)
  18 #define REG_MASK 0xFF
  19
  20 struct pm8916_priv {
  21         uint16_t usid; /* Slave ID on SPMI bus */
  22 };
  23
  24 static int pm8916_reg_count(struct udevice *dev)
  25 {
  26         return 0xFFFF;
  27 }
  28
  29 static int pm8916_write(struct udevice *dev, uint reg, const uint8_t *buff,
  30                         int len)
  31 {
  32         struct pm8916_priv *priv = dev_get_priv(dev);
  33
  34         if (len != 1)
  35                 return -EINVAL;
  36
  37         return spmi_reg_write(dev->parent, priv->usid,
  38                               (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK,
  39                               *buff);
  40 }
  41
  42 static int pm8916_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  43 {
  44         struct pm8916_priv *priv = dev_get_priv(dev);
  45         int val;
  46
  47         if (len != 1)
  48                 return -EINVAL;
  49
  50         val = spmi_reg_read(dev->parent, priv->usid,
  51                             (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK);
  52
  53         if (val < 0)
  54                 return val;
  55         *buff = val;
  56         return 0;
  57 }
  58
  59 static struct dm_pmic_ops pm8916_ops = {
  60         .reg_count = pm8916_reg_count,
  61         .read = pm8916_read,
  62         .write = pm8916_write,
  63 };
  64
  65 static const struct udevice_id pm8916_ids[] = {
  66         { .compatible = "qcom,spmi-pmic" },
  67         { }
  68 };
  69
  70 static int pm8916_probe(struct udevice *dev)
  71 {
  72         struct pm8916_priv *priv = dev_get_priv(dev);
  73
  74         priv->usid = dev_get_addr(dev);
  75
  76         if (priv->usid == FDT_ADDR_T_NONE)
  77                 return -EINVAL;
  78
  79         return 0;
  80 }
  81
  82
  83 static int pm8916_bind(struct udevice *dev)
  84 {
  85         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
  86 }
  87
  88 U_BOOT_DRIVER(pmic_pm8916) = {
  89         .name = "pmic_pm8916",
  90         .id = UCLASS_PMIC,
  91         .of_match = pm8916_ids,
  92         .bind = pm8916_bind,
  93         .probe = pm8916_probe,
  94         .ops = &pm8916_ops,
  95         .priv_auto_alloc_size = sizeof(struct pm8916_priv),
  96 };