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 <power/pmic.h>
  11 #include <spmi/spmi.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 #define PID_SHIFT 8
  16 #define PID_MASK (0xFF << PID_SHIFT)
  17 #define REG_MASK 0xFF
  18
  19 struct pm8916_priv {
  20         uint32_t usid; /* Slave ID on SPMI bus */
  21 };
  22
  23 static int pm8916_reg_count(struct udevice *dev)
  24 {
  25         return 0xFFFF;
  26 }
  27
  28 static int pm8916_write(struct udevice *dev, uint reg, const uint8_t *buff,
  29                         int len)
  30 {
  31         struct pm8916_priv *priv = dev_get_priv(dev);
  32
  33         if (len != 1)
  34                 return -EINVAL;
  35
  36         return spmi_reg_write(dev->parent, priv->usid,
  37                               (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK,
  38                               *buff);
  39 }
  40
  41 static int pm8916_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  42 {
  43         struct pm8916_priv *priv = dev_get_priv(dev);
  44         int val;
  45
  46         if (len != 1)
  47                 return -EINVAL;
  48
  49         val = spmi_reg_read(dev->parent, priv->usid,
  50                             (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK);
  51
  52         if (val < 0)
  53                 return val;
  54         *buff = val;
  55         return 0;
  56 }
  57
  58 static struct dm_pmic_ops pm8916_ops = {
  59         .reg_count = pm8916_reg_count,
  60         .read = pm8916_read,
  61         .write = pm8916_write,
  62 };
  63
  64 static const struct udevice_id pm8916_ids[] = {
  65         { .compatible = "qcom,spmi-pmic" },
  66         { }
  67 };
  68
  69 static int pm8916_probe(struct udevice *dev)
  70 {
  71         struct pm8916_priv *priv = dev_get_priv(dev);
  72
  73         priv->usid = devfdt_get_addr(dev);
  74
  75         if (priv->usid == FDT_ADDR_T_NONE)
  76                 return -EINVAL;
  77
  78         return 0;
  79 }
  80
  81 U_BOOT_DRIVER(pmic_pm8916) = {
  82         .name = "pmic_pm8916",
  83         .id = UCLASS_PMIC,
  84         .of_match = pm8916_ids,
  85         .bind = dm_scan_fdt_dev,
  86         .probe = pm8916_probe,
  87         .ops = &pm8916_ops,
  88         .priv_auto_alloc_size = sizeof(struct pm8916_priv),
  89 };