drivers/regulator/mp8859.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2019 five technologies GmbH
   4 // Author: Markus Reichl <m.reichl@fivetechno.de>
   5
   6 #include <linux/module.h>
   7 #include <linux/i2c.h>
   8 #include <linux/of.h>
   9 #include <linux/regulator/driver.h>
  10 #include <linux/regmap.h>
  11
  12
  13 #define VOL_MIN_IDX                     0x00
  14 #define VOL_MAX_IDX                     0x7ff
  15
  16 /* Register definitions */
  17 #define MP8859_VOUT_L_REG               0    //3 lo Bits
  18 #define MP8859_VOUT_H_REG               1    //8 hi Bits
  19 #define MP8859_VOUT_GO_REG              2
  20 #define MP8859_IOUT_LIM_REG             3
  21 #define MP8859_CTL1_REG                 4
  22 #define MP8859_CTL2_REG                 5
  23 #define MP8859_RESERVED1_REG            6
  24 #define MP8859_RESERVED2_REG            7
  25 #define MP8859_RESERVED3_REG            8
  26 #define MP8859_STATUS_REG               9
  27 #define MP8859_INTERRUPT_REG            0x0A
  28 #define MP8859_MASK_REG                 0x0B
  29 #define MP8859_ID1_REG                  0x0C
  30 #define MP8859_MFR_ID_REG               0x27
  31 #define MP8859_DEV_ID_REG               0x28
  32 #define MP8859_IC_REV_REG               0x29
  33
  34 #define MP8859_MAX_REG                  0x29
  35
  36 #define MP8859_GO_BIT                   0x01
  37
  38
  39 static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
  40 {
  41         int ret;
  42
  43         ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7);
  44
  45         if (ret)
  46                 return ret;
  47         ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3);
  48
  49         if (ret)
  50                 return ret;
  51         ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG,
  52                                         MP8859_GO_BIT, 1);
  53         return ret;
  54 }
  55
  56 static int mp8859_get_voltage_sel(struct regulator_dev *rdev)
  57 {
  58         unsigned int val_tmp;
  59         unsigned int val;
  60         int ret;
  61
  62         ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp);
  63
  64         if (ret)
  65                 return ret;
  66         val = val_tmp << 3;
  67
  68         ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp);
  69
  70         if (ret)
  71                 return ret;
  72         val |= val_tmp & 0x07;
  73         return val;
  74 }
  75
  76 static const struct linear_range mp8859_dcdc_ranges[] = {
  77         REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
  78 };
  79
  80 static const struct regmap_config mp8859_regmap = {
  81         .reg_bits = 8,
  82         .val_bits = 8,
  83         .max_register = MP8859_MAX_REG,
  84         .cache_type = REGCACHE_RBTREE,
  85 };
  86
  87 static const struct regulator_ops mp8859_ops = {
  88         .set_voltage_sel = mp8859_set_voltage_sel,
  89         .get_voltage_sel = mp8859_get_voltage_sel,
  90         .list_voltage = regulator_list_voltage_linear_range,
  91 };
  92
  93 static const struct regulator_desc mp8859_regulators[] = {
  94         {
  95                 .id = 0,
  96                 .type = REGULATOR_VOLTAGE,
  97                 .name = "mp8859_dcdc",
  98                 .supply_name = "vin",
  99                 .of_match = of_match_ptr("mp8859_dcdc"),
 100                 .n_voltages = VOL_MAX_IDX + 1,
 101                 .linear_ranges = mp8859_dcdc_ranges,
 102                 .n_linear_ranges = 1,
 103                 .ops = &mp8859_ops,
 104                 .owner = THIS_MODULE,
 105         },
 106 };
 107
 108 static int mp8859_i2c_probe(struct i2c_client *i2c)
 109 {
 110         int ret;
 111         struct regulator_config config = {.dev = &i2c->dev};
 112         struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap);
 113         struct regulator_dev *rdev;
 114
 115         if (IS_ERR(regmap)) {
 116                 ret = PTR_ERR(regmap);
 117                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 118                 return ret;
 119         }
 120         rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0],
 121                                         &config);
 122
 123         if (IS_ERR(rdev)) {
 124                 ret = PTR_ERR(rdev);
 125                 dev_err(&i2c->dev, "failed to register %s: %d\n",
 126                         mp8859_regulators[0].name, ret);
 127                 return ret;
 128         }
 129         return 0;
 130 }
 131
 132 static const struct of_device_id mp8859_dt_id[] = {
 133         {.compatible =  "mps,mp8859"},
 134         {},
 135 };
 136 MODULE_DEVICE_TABLE(of, mp8859_dt_id);
 137
 138 static const struct i2c_device_id mp8859_i2c_id[] = {
 139         { "mp8859", },
 140         {  },
 141 };
 142 MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id);
 143
 144 static struct i2c_driver mp8859_regulator_driver = {
 145         .driver = {
 146                 .name = "mp8859",
 147                 .of_match_table = of_match_ptr(mp8859_dt_id),
 148         },
 149         .probe_new = mp8859_i2c_probe,
 150         .id_table = mp8859_i2c_id,
 151 };
 152
 153 module_i2c_driver(mp8859_regulator_driver);
 154
 155 MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver");
 156 MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>");
 157 MODULE_LICENSE("GPL v2");