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200 lines
4.9 KiB
200 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/drivers/regulator/aat2870-regulator.c |
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* |
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* Copyright (c) 2011, NVIDIA Corporation. |
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* Author: Jin Park <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/err.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/machine.h> |
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#include <linux/mfd/aat2870.h> |
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struct aat2870_regulator { |
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struct aat2870_data *aat2870; |
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struct regulator_desc desc; |
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u8 enable_addr; |
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u8 enable_shift; |
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u8 enable_mask; |
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u8 voltage_addr; |
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u8 voltage_shift; |
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u8 voltage_mask; |
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}; |
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static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, |
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unsigned selector) |
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{ |
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struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
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struct aat2870_data *aat2870 = ri->aat2870; |
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return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, |
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selector << ri->voltage_shift); |
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} |
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static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) |
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{ |
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struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
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struct aat2870_data *aat2870 = ri->aat2870; |
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u8 val; |
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int ret; |
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ret = aat2870->read(aat2870, ri->voltage_addr, &val); |
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if (ret) |
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return ret; |
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return (val & ri->voltage_mask) >> ri->voltage_shift; |
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} |
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static int aat2870_ldo_enable(struct regulator_dev *rdev) |
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{ |
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struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
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struct aat2870_data *aat2870 = ri->aat2870; |
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return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, |
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ri->enable_mask); |
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} |
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static int aat2870_ldo_disable(struct regulator_dev *rdev) |
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{ |
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struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
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struct aat2870_data *aat2870 = ri->aat2870; |
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return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); |
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} |
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static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) |
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{ |
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struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
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struct aat2870_data *aat2870 = ri->aat2870; |
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u8 val; |
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int ret; |
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ret = aat2870->read(aat2870, ri->enable_addr, &val); |
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if (ret) |
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return ret; |
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return val & ri->enable_mask ? 1 : 0; |
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} |
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static const struct regulator_ops aat2870_ldo_ops = { |
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.list_voltage = regulator_list_voltage_table, |
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.map_voltage = regulator_map_voltage_ascend, |
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.set_voltage_sel = aat2870_ldo_set_voltage_sel, |
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.get_voltage_sel = aat2870_ldo_get_voltage_sel, |
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.enable = aat2870_ldo_enable, |
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.disable = aat2870_ldo_disable, |
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.is_enabled = aat2870_ldo_is_enabled, |
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}; |
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static const unsigned int aat2870_ldo_voltages[] = { |
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1200000, 1300000, 1500000, 1600000, |
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1800000, 2000000, 2200000, 2500000, |
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2600000, 2700000, 2800000, 2900000, |
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3000000, 3100000, 3200000, 3300000, |
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}; |
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#define AAT2870_LDO(ids) \ |
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{ \ |
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.desc = { \ |
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.name = #ids, \ |
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.id = AAT2870_ID_##ids, \ |
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.n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ |
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.volt_table = aat2870_ldo_voltages, \ |
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.ops = &aat2870_ldo_ops, \ |
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.type = REGULATOR_VOLTAGE, \ |
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.owner = THIS_MODULE, \ |
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}, \ |
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} |
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static struct aat2870_regulator aat2870_regulators[] = { |
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AAT2870_LDO(LDOA), |
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AAT2870_LDO(LDOB), |
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AAT2870_LDO(LDOC), |
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AAT2870_LDO(LDOD), |
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}; |
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static struct aat2870_regulator *aat2870_get_regulator(int id) |
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{ |
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struct aat2870_regulator *ri = NULL; |
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int i; |
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for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { |
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ri = &aat2870_regulators[i]; |
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if (ri->desc.id == id) |
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break; |
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} |
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if (i == ARRAY_SIZE(aat2870_regulators)) |
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return NULL; |
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ri->enable_addr = AAT2870_LDO_EN; |
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ri->enable_shift = id - AAT2870_ID_LDOA; |
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ri->enable_mask = 0x1 << ri->enable_shift; |
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ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? |
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AAT2870_LDO_CD : AAT2870_LDO_AB; |
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ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; |
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ri->voltage_mask = 0xF << ri->voltage_shift; |
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return ri; |
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} |
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static int aat2870_regulator_probe(struct platform_device *pdev) |
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{ |
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struct aat2870_regulator *ri; |
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struct regulator_config config = { }; |
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struct regulator_dev *rdev; |
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ri = aat2870_get_regulator(pdev->id); |
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if (!ri) { |
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dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); |
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return -EINVAL; |
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} |
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ri->aat2870 = dev_get_drvdata(pdev->dev.parent); |
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config.dev = &pdev->dev; |
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config.driver_data = ri; |
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config.init_data = dev_get_platdata(&pdev->dev); |
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rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); |
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if (IS_ERR(rdev)) { |
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dev_err(&pdev->dev, "Failed to register regulator %s\n", |
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ri->desc.name); |
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return PTR_ERR(rdev); |
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} |
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platform_set_drvdata(pdev, rdev); |
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return 0; |
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} |
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static struct platform_driver aat2870_regulator_driver = { |
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.driver = { |
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.name = "aat2870-regulator", |
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}, |
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.probe = aat2870_regulator_probe, |
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}; |
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static int __init aat2870_regulator_init(void) |
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{ |
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return platform_driver_register(&aat2870_regulator_driver); |
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} |
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subsys_initcall(aat2870_regulator_init); |
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static void __exit aat2870_regulator_exit(void) |
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{ |
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platform_driver_unregister(&aat2870_regulator_driver); |
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} |
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module_exit(aat2870_regulator_exit); |
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MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Jin Park <[email protected]>"); |
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MODULE_ALIAS("platform:aat2870-regulator");
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