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[] __maybe_unused = { 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 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 148 .of_match_table = of_match_ptr(mp8859_dt_id), 149 }, 150 .probe = mp8859_i2c_probe, 151 .id_table = mp8859_i2c_id, 152 }; 153 154 module_i2c_driver(mp8859_regulator_driver); 155 156 MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver"); 157 MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>"); 158 MODULE_LICENSE("GPL v2"); 159