154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// sy8106a-regulator.c - Regulator device driver for SY8106A
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//
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// Copyright (C) 2016 Ondřej Jirman <megous@megous.com>
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// Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#define SY8106A_REG_VOUT1_SEL 0x01
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#define SY8106A_REG_VOUT_COM 0x02
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#define SY8106A_REG_VOUT1_SEL_MASK 0x7f
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#define SY8106A_DISABLE_REG BIT(0)
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/*
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* The I2C controlled voltage will only work when this bit is set; otherwise
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* it will behave like a fixed regulator.
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*/
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#define SY8106A_GO_BIT BIT(7)
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static const struct regmap_config sy8106a_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static const struct regulator_ops sy8106a_ops = {
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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/* Enabling/disabling the regulator is not yet implemented */
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};
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/* Default limits measured in millivolts */
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#define SY8106A_MIN_MV 680
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#define SY8106A_MAX_MV 1950
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#define SY8106A_STEP_MV 10
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static const struct regulator_desc sy8106a_reg = {
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.name = "SY8106A",
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.id = 0,
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.ops = &sy8106a_ops,
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.type = REGULATOR_VOLTAGE,
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.n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,
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.min_uV = (SY8106A_MIN_MV * 1000),
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.uV_step = (SY8106A_STEP_MV * 1000),
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.vsel_reg = SY8106A_REG_VOUT1_SEL,
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.vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,
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/*
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* This ramp_delay is a conservative default value which works on
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* H3/H5 boards VDD-CPUX situations.
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*/
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.ramp_delay = 200,
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.owner = THIS_MODULE,
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};
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/*
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* I2C driver interface functions
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*/
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static int sy8106a_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct device *dev = &i2c->dev;
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struct regulator_dev *rdev;
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struct regulator_config config = { };
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struct regmap *regmap;
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unsigned int reg, vsel;
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u32 fixed_voltage;
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int error;
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error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt",
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&fixed_voltage);
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if (error)
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return error;
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if (fixed_voltage < SY8106A_MIN_MV * 1000 ||
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fixed_voltage > SY8106A_MAX_MV * 1000)
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return -EINVAL;
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regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);
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if (IS_ERR(regmap)) {
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error = PTR_ERR(regmap);
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dev_err(dev, "Failed to allocate register map: %d\n", error);
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return error;
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}
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config.dev = &i2c->dev;
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config.regmap = regmap;
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config.of_node = dev->of_node;
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config.init_data = of_get_regulator_init_data(dev, dev->of_node,
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&sy8106a_reg);
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if (!config.init_data)
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return -ENOMEM;
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/* Ensure GO_BIT is enabled when probing */
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error = regmap_read(regmap, SY8106A_REG_VOUT1_SEL, ®);
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if (error)
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return error;
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if (!(reg & SY8106A_GO_BIT)) {
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vsel = (fixed_voltage / 1000 - SY8106A_MIN_MV) /
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SY8106A_STEP_MV;
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error = regmap_write(regmap, SY8106A_REG_VOUT1_SEL,
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vsel | SY8106A_GO_BIT);
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if (error)
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return error;
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}
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/* Probe regulator */
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rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);
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if (IS_ERR(rdev)) {
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error = PTR_ERR(rdev);
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dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error);
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return error;
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}
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return 0;
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}
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static const struct of_device_id sy8106a_i2c_of_match[] = {
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{ .compatible = "silergy,sy8106a" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match);
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static const struct i2c_device_id sy8106a_i2c_id[] = {
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{ "sy8106a", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);
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static struct i2c_driver sy8106a_regulator_driver = {
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.driver = {
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.name = "sy8106a",
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.of_match_table = of_match_ptr(sy8106a_i2c_of_match),
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},
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.probe = sy8106a_i2c_probe,
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.id_table = sy8106a_i2c_id,
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};
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module_i2c_driver(sy8106a_regulator_driver);
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MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>");
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MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
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MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");
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MODULE_LICENSE("GPL");
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