git.sur5r.net Git - u-boot/blob - 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 #define PID_SHIFT 8
  14 #define PID_MASK (0xFF << PID_SHIFT)
  15 #define REG_MASK 0xFF
  16
  17 struct pm8916_priv {
  18         uint32_t usid; /* Slave ID on SPMI bus */
  19 };
  20
  21 static int pm8916_reg_count(struct udevice *dev)
  22 {
  23         return 0xFFFF;
  24 }
  25
  26 static int pm8916_write(struct udevice *dev, uint reg, const uint8_t *buff,
  27                         int len)
  28 {
  29         struct pm8916_priv *priv = dev_get_priv(dev);
  30
  31         if (len != 1)
  32                 return -EINVAL;
  33
  34         return spmi_reg_write(dev->parent, priv->usid,
  35                               (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK,
  36                               *buff);
  37 }
  38
  39 static int pm8916_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  40 {
  41         struct pm8916_priv *priv = dev_get_priv(dev);
  42         int val;
  43
  44         if (len != 1)
  45                 return -EINVAL;
  46
  47         val = spmi_reg_read(dev->parent, priv->usid,
  48                             (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK);
  49
  50         if (val < 0)
  51                 return val;
  52         *buff = val;
  53         return 0;
  54 }
  55
  56 static struct dm_pmic_ops pm8916_ops = {
  57         .reg_count = pm8916_reg_count,
  58         .read = pm8916_read,
  59         .write = pm8916_write,
  60 };
  61
  62 static const struct udevice_id pm8916_ids[] = {
  63         { .compatible = "qcom,spmi-pmic" },
  64         { }
  65 };
  66
  67 static int pm8916_probe(struct udevice *dev)
  68 {
  69         struct pm8916_priv *priv = dev_get_priv(dev);
  70
  71         priv->usid = dev_read_addr(dev);
  72
  73         if (priv->usid == FDT_ADDR_T_NONE)
  74                 return -EINVAL;
  75
  76         return 0;
  77 }
  78
  79 U_BOOT_DRIVER(pmic_pm8916) = {
  80         .name = "pmic_pm8916",
  81         .id = UCLASS_PMIC,
  82         .of_match = pm8916_ids,
  83         .bind = dm_scan_fdt_dev,
  84         .probe = pm8916_probe,
  85         .ops = &pm8916_ops,
  86         .priv_auto_alloc_size = sizeof(struct pm8916_priv),
  87 };