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152 lines
4.0 KiB
152 lines
4.0 KiB
// 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 <[email protected]> |
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// Copyright (c) 2017-2018 Icenowy Zheng <[email protected]> |
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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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{ |
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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 __maybe_unused 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_new = 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 <[email protected]>"); |
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MODULE_AUTHOR("Icenowy Zheng <[email protected]>"); |
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MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A"); |
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MODULE_LICENSE("GPL");
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