git.sur5r.net Git - u-boot/blob - drivers/power/pmic/pm8916.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Qualcomm pm8916 pmic driver
   4  *
   5  * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
   6  */
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <power/pmic.h>
  10 #include <spmi/spmi.h>
  11
  12 #define PID_SHIFT 8
  13 #define PID_MASK (0xFF << PID_SHIFT)
  14 #define REG_MASK 0xFF
  15
  16 struct pm8916_priv {
  17         uint32_t usid; /* Slave ID on SPMI bus */
  18 };
  19
  20 static int pm8916_reg_count(struct udevice *dev)
  21 {
  22         return 0xFFFF;
  23 }
  24
  25 static int pm8916_write(struct udevice *dev, uint reg, const uint8_t *buff,
  26                         int len)
  27 {
  28         struct pm8916_priv *priv = dev_get_priv(dev);
  29
  30         if (len != 1)
  31                 return -EINVAL;
  32
  33         return spmi_reg_write(dev->parent, priv->usid,
  34                               (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK,
  35                               *buff);
  36 }
  37
  38 static int pm8916_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  39 {
  40         struct pm8916_priv *priv = dev_get_priv(dev);
  41         int val;
  42
  43         if (len != 1)
  44                 return -EINVAL;
  45
  46         val = spmi_reg_read(dev->parent, priv->usid,
  47                             (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK);
  48
  49         if (val < 0)
  50                 return val;
  51         *buff = val;
  52         return 0;
  53 }
  54
  55 static struct dm_pmic_ops pm8916_ops = {
  56         .reg_count = pm8916_reg_count,
  57         .read = pm8916_read,
  58         .write = pm8916_write,
  59 };
  60
  61 static const struct udevice_id pm8916_ids[] = {
  62         { .compatible = "qcom,spmi-pmic" },
  63         { }
  64 };
  65
  66 static int pm8916_probe(struct udevice *dev)
  67 {
  68         struct pm8916_priv *priv = dev_get_priv(dev);
  69
  70         priv->usid = dev_read_addr(dev);
  71
  72         if (priv->usid == FDT_ADDR_T_NONE)
  73                 return -EINVAL;
  74
  75         return 0;
  76 }
  77
  78 U_BOOT_DRIVER(pmic_pm8916) = {
  79         .name = "pmic_pm8916",
  80         .id = UCLASS_PMIC,
  81         .of_match = pm8916_ids,
  82         .bind = dm_scan_fdt_dev,
  83         .probe = pm8916_probe,
  84         .ops = &pm8916_ops,
  85         .priv_auto_alloc_size = sizeof(struct pm8916_priv),
  86 };