drivers/soc/starfive/jh7110_pmic.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * PMIC driver for the StarFive JH7110 SoC
   4  *
   5  * Copyright (C) 2022 changhuang <changhuang.liang@starfivetech.com>
   6  */
   7
   8 #include <linux/i2c.h>
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/device.h>
  12 #include <soc/starfive/jh7110_pmic.h>
  13
  14 static struct pmic_dev *pmic_dev;
  15
  16 static int pmic_read_reg(struct pmic_dev *pmic_dev, u8 reg)
  17 {
  18         struct i2c_client *client = pmic_dev->i2c_client;
  19         int ret = i2c_smbus_read_byte_data(client, reg);
  20
  21         if (ret < 0)
  22                 dev_err(&client->dev, "Read Error\n");
  23
  24         return ret;
  25 }
  26
  27 static int pmic_write_reg(struct pmic_dev *pmic_dev, u8 reg, u8 val)
  28 {
  29         struct i2c_client *client = pmic_dev->i2c_client;
  30         int ret = i2c_smbus_write_byte_data(client, reg, val);
  31
  32         if (ret < 0)
  33                 dev_err(&client->dev, "Write Error\n");
  34
  35         return ret;
  36 }
  37
  38 static void pmic_set_bit(struct pmic_dev *pmic_dev, u8 reg, u8 mask, u8 val)
  39 {
  40         u8 value;
  41
  42         value = pmic_read_reg(pmic_dev, reg) & ~mask;
  43         val &= mask;
  44         val |= value;
  45         pmic_write_reg(pmic_dev, reg, val);
  46 }
  47
  48 void pmic_set_domain(u8 reg, u8 domain, u8 on)
  49 {
  50         pmic_set_bit(pmic_dev, reg, BIT(domain), on<<domain);
  51 }
  52 EXPORT_SYMBOL(pmic_set_domain);
  53
  54 static int pmic_probe(struct i2c_client *client)
  55 {
  56         struct device *dev = &client->dev;
  57
  58         pmic_dev = devm_kzalloc(dev, sizeof(*pmic_dev), GFP_KERNEL);
  59         if (!pmic_dev)
  60                 return -ENOMEM;
  61
  62         pmic_dev->i2c_client = client;
  63
  64         dev_info(dev, "pmic init success!");
  65
  66         return 0;
  67 }
  68
  69 static int pmic_remove(struct i2c_client *client)
  70 {
  71         return 0;
  72 }
  73
  74 static const struct i2c_device_id pmic_id[] = {
  75         {"pmic", 0},
  76         {},
  77 };
  78 MODULE_DEVICE_TABLE(i2c, pmic_id);
  79
  80 static const struct of_device_id pmic_dt_ids[] = {
  81         { .compatible = "starfive,pmic" },
  82         { /* sentinel */ }
  83 };
  84 MODULE_DEVICE_TABLE(of, pmic_dt_ids);
  85
  86 static struct i2c_driver pmic_i2c_driver = {
  87         .driver = {
  88                 .name  = "pmic",
  89                 .of_match_table = pmic_dt_ids,
  90         },
  91         .id_table = pmic_id,
  92         .probe_new = pmic_probe,
  93         .remove   = pmic_remove,
  94 };
  95
  96 static __init int pmic_init(void)
  97 {
  98         return i2c_add_driver(&pmic_i2c_driver);
  99 }
 100
 101 static __exit void pmic_exit(void)
 102 {
 103         i2c_del_driver(&pmic_i2c_driver);
 104 }
 105
 106 fs_initcall(pmic_init);
 107 module_exit(pmic_exit);
 108
 109 MODULE_AUTHOR("changhuang <changhuang.liang@starfivetech.com>");
 110 MODULE_DESCRIPTION("StarFive JH7110 PMIC Device Driver");
 111 MODULE_LICENSE("GPL v2");