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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | // SPDX-License-Identifier: GPL-2.0+ // // sy8106a-regulator.c - Regulator device driver for SY8106A // // Copyright (C) 2016 Ondřej Jirman <megous@megous.com> // Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io> #include <linux/err.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/regulator/driver.h> #include <linux/regulator/of_regulator.h> #define SY8106A_REG_VOUT1_SEL 0x01 #define SY8106A_REG_VOUT_COM 0x02 #define SY8106A_REG_VOUT1_SEL_MASK 0x7f #define SY8106A_DISABLE_REG BIT(0) /* * The I2C controlled voltage will only work when this bit is set; otherwise * it will behave like a fixed regulator. */ #define SY8106A_GO_BIT BIT(7) static const struct regmap_config sy8106a_regmap_config = { .reg_bits = 8, .val_bits = 8, }; static const struct regulator_ops sy8106a_ops = { .set_voltage_sel = regulator_set_voltage_sel_regmap, .set_voltage_time_sel = regulator_set_voltage_time_sel, .get_voltage_sel = regulator_get_voltage_sel_regmap, .list_voltage = regulator_list_voltage_linear, /* Enabling/disabling the regulator is not yet implemented */ }; /* Default limits measured in millivolts */ #define SY8106A_MIN_MV 680 #define SY8106A_MAX_MV 1950 #define SY8106A_STEP_MV 10 static const struct regulator_desc sy8106a_reg = { .name = "SY8106A", .id = 0, .ops = &sy8106a_ops, .type = REGULATOR_VOLTAGE, .n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1, .min_uV = (SY8106A_MIN_MV * 1000), .uV_step = (SY8106A_STEP_MV * 1000), .vsel_reg = SY8106A_REG_VOUT1_SEL, .vsel_mask = SY8106A_REG_VOUT1_SEL_MASK, /* * This ramp_delay is a conservative default value which works on * H3/H5 boards VDD-CPUX situations. */ .ramp_delay = 200, .owner = THIS_MODULE, }; /* * I2C driver interface functions */ static int sy8106a_i2c_probe(struct i2c_client *i2c) { struct device *dev = &i2c->dev; struct regulator_dev *rdev; struct regulator_config config = { }; struct regmap *regmap; unsigned int reg, vsel; u32 fixed_voltage; int error; error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt", &fixed_voltage); if (error) return error; if (fixed_voltage < SY8106A_MIN_MV * 1000 || fixed_voltage > SY8106A_MAX_MV * 1000) return -EINVAL; regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config); if (IS_ERR(regmap)) { error = PTR_ERR(regmap); dev_err(dev, "Failed to allocate register map: %d\n", error); return error; } config.dev = &i2c->dev; config.regmap = regmap; config.of_node = dev->of_node; config.init_data = of_get_regulator_init_data(dev, dev->of_node, &sy8106a_reg); if (!config.init_data) return -ENOMEM; /* Ensure GO_BIT is enabled when probing */ error = regmap_read(regmap, SY8106A_REG_VOUT1_SEL, ®); if (error) return error; if (!(reg & SY8106A_GO_BIT)) { vsel = (fixed_voltage / 1000 - SY8106A_MIN_MV) / SY8106A_STEP_MV; error = regmap_write(regmap, SY8106A_REG_VOUT1_SEL, vsel | SY8106A_GO_BIT); if (error) return error; } /* Probe regulator */ rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config); if (IS_ERR(rdev)) { error = PTR_ERR(rdev); dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error); return error; } return 0; } static const struct of_device_id __maybe_unused sy8106a_i2c_of_match[] = { { .compatible = "silergy,sy8106a" }, { }, }; MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match); static const struct i2c_device_id sy8106a_i2c_id[] = { { "sy8106a", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id); static struct i2c_driver sy8106a_regulator_driver = { .driver = { .name = "sy8106a", .of_match_table = of_match_ptr(sy8106a_i2c_of_match), }, .probe_new = sy8106a_i2c_probe, .id_table = sy8106a_i2c_id, }; module_i2c_driver(sy8106a_regulator_driver); MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>"); MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A"); MODULE_LICENSE("GPL"); |