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157 lines
3.6 KiB
157 lines
3.6 KiB
// 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 <[email protected]> |
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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[] = { |
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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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.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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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