drivers/regulator/isl6271a-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * isl6271a-regulator.c
   4  *
   5  * Support for Intersil ISL6271A voltage regulator
   6  *
   7  * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/err.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/driver.h>
  16 #include <linux/i2c.h>
  17 #include <linux/slab.h>
  18
  19 #define ISL6271A_VOLTAGE_MIN    850000
  20 #define ISL6271A_VOLTAGE_MAX    1600000
  21 #define ISL6271A_VOLTAGE_STEP   50000
  22
  23 /* PMIC details */
  24 struct isl_pmic {
  25         struct i2c_client       *client;
  26         struct mutex            mtx;
  27 };
  28
  29 static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
  30 {
  31         struct isl_pmic *pmic = rdev_get_drvdata(dev);
  32         int idx;
  33
  34         mutex_lock(&pmic->mtx);
  35
  36         idx = i2c_smbus_read_byte(pmic->client);
  37         if (idx < 0)
  38                 dev_err(&pmic->client->dev, "Error getting voltage\n");
  39
  40         mutex_unlock(&pmic->mtx);
  41         return idx;
  42 }
  43
  44 static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
  45                                     unsigned selector)
  46 {
  47         struct isl_pmic *pmic = rdev_get_drvdata(dev);
  48         int err;
  49
  50         mutex_lock(&pmic->mtx);
  51
  52         err = i2c_smbus_write_byte(pmic->client, selector);
  53         if (err < 0)
  54                 dev_err(&pmic->client->dev, "Error setting voltage\n");
  55
  56         mutex_unlock(&pmic->mtx);
  57         return err;
  58 }
  59
  60 static const struct regulator_ops isl_core_ops = {
  61         .get_voltage_sel = isl6271a_get_voltage_sel,
  62         .set_voltage_sel = isl6271a_set_voltage_sel,
  63         .list_voltage   = regulator_list_voltage_linear,
  64         .map_voltage    = regulator_map_voltage_linear,
  65 };
  66
  67 static const struct regulator_ops isl_fixed_ops = {
  68         .list_voltage   = regulator_list_voltage_linear,
  69 };
  70
  71 static const struct regulator_desc isl_rd[] = {
  72         {
  73                 .name           = "Core Buck",
  74                 .id             = 0,
  75                 .n_voltages     = 16,
  76                 .ops            = &isl_core_ops,
  77                 .type           = REGULATOR_VOLTAGE,
  78                 .owner          = THIS_MODULE,
  79                 .min_uV         = ISL6271A_VOLTAGE_MIN,
  80                 .uV_step        = ISL6271A_VOLTAGE_STEP,
  81         }, {
  82                 .name           = "LDO1",
  83                 .id             = 1,
  84                 .n_voltages     = 1,
  85                 .ops            = &isl_fixed_ops,
  86                 .type           = REGULATOR_VOLTAGE,
  87                 .owner          = THIS_MODULE,
  88                 .min_uV         = 1100000,
  89         }, {
  90                 .name           = "LDO2",
  91                 .id             = 2,
  92                 .n_voltages     = 1,
  93                 .ops            = &isl_fixed_ops,
  94                 .type           = REGULATOR_VOLTAGE,
  95                 .owner          = THIS_MODULE,
  96                 .min_uV         = 1300000,
  97         },
  98 };
  99
 100 static int isl6271a_probe(struct i2c_client *i2c)
 101 {
 102         const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
 103         struct regulator_dev *rdev;
 104         struct regulator_config config = { };
 105         struct regulator_init_data *init_data   = dev_get_platdata(&i2c->dev);
 106         struct isl_pmic *pmic;
 107         int i;
 108
 109         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 110                 return -EIO;
 111
 112         pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
 113         if (!pmic)
 114                 return -ENOMEM;
 115
 116         pmic->client = i2c;
 117
 118         mutex_init(&pmic->mtx);
 119
 120         for (i = 0; i < 3; i++) {
 121                 config.dev = &i2c->dev;
 122                 if (i == 0)
 123                         config.init_data = init_data;
 124                 else
 125                         config.init_data = NULL;
 126                 config.driver_data = pmic;
 127
 128                 rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config);
 129                 if (IS_ERR(rdev)) {
 130                         dev_err(&i2c->dev, "failed to register %s\n", id->name);
 131                         return PTR_ERR(rdev);
 132                 }
 133         }
 134
 135         i2c_set_clientdata(i2c, pmic);
 136
 137         return 0;
 138 }
 139
 140 static const struct i2c_device_id isl6271a_id[] = {
 141         {.name = "isl6271a", 0 },
 142         { },
 143 };
 144
 145 MODULE_DEVICE_TABLE(i2c, isl6271a_id);
 146
 147 static struct i2c_driver isl6271a_i2c_driver = {
 148         .driver = {
 149                 .name = "isl6271a",
 150                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 151         },
 152         .probe = isl6271a_probe,
 153         .id_table = isl6271a_id,
 154 };
 155
 156 static int __init isl6271a_init(void)
 157 {
 158         return i2c_add_driver(&isl6271a_i2c_driver);
 159 }
 160
 161 static void __exit isl6271a_cleanup(void)
 162 {
 163         i2c_del_driver(&isl6271a_i2c_driver);
 164 }
 165
 166 subsys_initcall(isl6271a_init);
 167 module_exit(isl6271a_cleanup);
 168
 169 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 170 MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
 171 MODULE_LICENSE("GPL v2");