159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (c) 2019 five technologies GmbH
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// Author: Markus Reichl <m.reichl@fivetechno.de>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/of.h>
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#include <linux/regulator/driver.h>
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#include <linux/regmap.h>
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#define VOL_MIN_IDX 0x00
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#define VOL_MAX_IDX 0x7ff
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/* Register definitions */
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#define MP8859_VOUT_L_REG 0 //3 lo Bits
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#define MP8859_VOUT_H_REG 1 //8 hi Bits
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#define MP8859_VOUT_GO_REG 2
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#define MP8859_IOUT_LIM_REG 3
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#define MP8859_CTL1_REG 4
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#define MP8859_CTL2_REG 5
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#define MP8859_RESERVED1_REG 6
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#define MP8859_RESERVED2_REG 7
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#define MP8859_RESERVED3_REG 8
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#define MP8859_STATUS_REG 9
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#define MP8859_INTERRUPT_REG 0x0A
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#define MP8859_MASK_REG 0x0B
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#define MP8859_ID1_REG 0x0C
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#define MP8859_MFR_ID_REG 0x27
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#define MP8859_DEV_ID_REG 0x28
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#define MP8859_IC_REV_REG 0x29
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#define MP8859_MAX_REG 0x29
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#define MP8859_GO_BIT 0x01
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static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
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{
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int ret;
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ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7);
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if (ret)
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return ret;
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ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3);
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if (ret)
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return ret;
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ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG,
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MP8859_GO_BIT, 1);
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return ret;
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}
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static int mp8859_get_voltage_sel(struct regulator_dev *rdev)
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{
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unsigned int val_tmp;
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unsigned int val;
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int ret;
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ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp);
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if (ret)
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return ret;
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val = val_tmp << 3;
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ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp);
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if (ret)
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return ret;
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val |= val_tmp & 0x07;
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return val;
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}
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static const struct linear_range mp8859_dcdc_ranges[] = {
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REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
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};
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static const struct regmap_config mp8859_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MP8859_MAX_REG,
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.cache_type = REGCACHE_RBTREE,
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};
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static const struct regulator_ops mp8859_ops = {
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.set_voltage_sel = mp8859_set_voltage_sel,
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.get_voltage_sel = mp8859_get_voltage_sel,
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.list_voltage = regulator_list_voltage_linear_range,
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};
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static const struct regulator_desc mp8859_regulators[] = {
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{
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.id = 0,
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.type = REGULATOR_VOLTAGE,
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.name = "mp8859_dcdc",
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.supply_name = "vin",
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.of_match = of_match_ptr("mp8859_dcdc"),
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.n_voltages = VOL_MAX_IDX + 1,
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.linear_ranges = mp8859_dcdc_ranges,
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.n_linear_ranges = 1,
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.ops = &mp8859_ops,
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.owner = THIS_MODULE,
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},
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};
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static int mp8859_i2c_probe(struct i2c_client *i2c)
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{
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int ret;
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struct regulator_config config = {.dev = &i2c->dev};
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struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap);
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struct regulator_dev *rdev;
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if (IS_ERR(regmap)) {
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ret = PTR_ERR(regmap);
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dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
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return ret;
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}
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rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0],
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&config);
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if (IS_ERR(rdev)) {
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ret = PTR_ERR(rdev);
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dev_err(&i2c->dev, "failed to register %s: %d\n",
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mp8859_regulators[0].name, ret);
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return ret;
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}
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return 0;
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}
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static const struct of_device_id mp8859_dt_id[] __maybe_unused = {
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{.compatible = "mps,mp8859"},
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{},
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};
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MODULE_DEVICE_TABLE(of, mp8859_dt_id);
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static const struct i2c_device_id mp8859_i2c_id[] = {
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{ "mp8859", },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id);
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static struct i2c_driver mp8859_regulator_driver = {
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.driver = {
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.name = "mp8859",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.of_match_table = of_match_ptr(mp8859_dt_id),
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},
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.probe_new = mp8859_i2c_probe,
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.id_table = mp8859_i2c_id,
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};
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module_i2c_driver(mp8859_regulator_driver);
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MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver");
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MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>");
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MODULE_LICENSE("GPL v2");
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