/* * linux/drivers/regulator/aat2870-regulator.c * * Copyright (c) 2011, NVIDIA Corporation. * Author: Jin Park <jinyoungp@nvidia.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/err.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> #include <linux/mfd/aat2870.h> struct aat2870_regulator { struct platform_device *pdev; struct regulator_desc desc; const int *voltages; /* uV */ int min_uV; int max_uV; u8 enable_addr; u8 enable_shift; u8 enable_mask; u8 voltage_addr; u8 voltage_shift; u8 voltage_mask; }; static int aat2870_ldo_list_voltage(struct regulator_dev *rdev, unsigned selector) { struct aat2870_regulator *ri = rdev_get_drvdata(rdev); return ri->voltages[selector]; } static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector) { struct aat2870_regulator *ri = rdev_get_drvdata(rdev); struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, selector << ri->voltage_shift); } static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) { struct aat2870_regulator *ri = rdev_get_drvdata(rdev); struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); u8 val; int ret; ret = aat2870->read(aat2870, ri->voltage_addr, &val); if (ret) return ret; return (val & ri->voltage_mask) >> ri->voltage_shift; } static int aat2870_ldo_enable(struct regulator_dev *rdev) { struct aat2870_regulator *ri = rdev_get_drvdata(rdev); struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, ri->enable_mask); } static int aat2870_ldo_disable(struct regulator_dev *rdev) { struct aat2870_regulator *ri = rdev_get_drvdata(rdev); struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); } static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) { struct aat2870_regulator *ri = rdev_get_drvdata(rdev); struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); u8 val; int ret; ret = aat2870->read(aat2870, ri->enable_addr, &val); if (ret) return ret; return val & ri->enable_mask ? 1 : 0; } static struct regulator_ops aat2870_ldo_ops = { .list_voltage = aat2870_ldo_list_voltage, .set_voltage_sel = aat2870_ldo_set_voltage_sel, .get_voltage_sel = aat2870_ldo_get_voltage_sel, .enable = aat2870_ldo_enable, .disable = aat2870_ldo_disable, .is_enabled = aat2870_ldo_is_enabled, }; static const int aat2870_ldo_voltages[] = { 1200000, 1300000, 1500000, 1600000, 1800000, 2000000, 2200000, 2500000, 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000, }; #define AAT2870_LDO(ids) \ { \ .desc = { \ .name = #ids, \ .id = AAT2870_ID_##ids, \ .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ .ops = &aat2870_ldo_ops, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ }, \ .voltages = aat2870_ldo_voltages, \ .min_uV = 1200000, \ .max_uV = 3300000, \ } static struct aat2870_regulator aat2870_regulators[] = { AAT2870_LDO(LDOA), AAT2870_LDO(LDOB), AAT2870_LDO(LDOC), AAT2870_LDO(LDOD), }; static struct aat2870_regulator *aat2870_get_regulator(int id) { struct aat2870_regulator *ri = NULL; int i; for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { ri = &aat2870_regulators[i]; if (ri->desc.id == id) break; } if (i == ARRAY_SIZE(aat2870_regulators)) return NULL; ri->enable_addr = AAT2870_LDO_EN; ri->enable_shift = id - AAT2870_ID_LDOA; ri->enable_mask = 0x1 << ri->enable_shift; ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? AAT2870_LDO_CD : AAT2870_LDO_AB; ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; ri->voltage_mask = 0xF << ri->voltage_shift; return ri; } static int aat2870_regulator_probe(struct platform_device *pdev) { struct aat2870_regulator *ri; struct regulator_dev *rdev; ri = aat2870_get_regulator(pdev->id); if (!ri) { dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); return -EINVAL; } ri->pdev = pdev; rdev = regulator_register(&ri->desc, &pdev->dev, pdev->dev.platform_data, ri, NULL); if (IS_ERR(rdev)) { dev_err(&pdev->dev, "Failed to register regulator %s\n", ri->desc.name); return PTR_ERR(rdev); } platform_set_drvdata(pdev, rdev); return 0; } static int __devexit aat2870_regulator_remove(struct platform_device *pdev) { struct regulator_dev *rdev = platform_get_drvdata(pdev); regulator_unregister(rdev); return 0; } static struct platform_driver aat2870_regulator_driver = { .driver = { .name = "aat2870-regulator", .owner = THIS_MODULE, }, .probe = aat2870_regulator_probe, .remove = __devexit_p(aat2870_regulator_remove), }; static int __init aat2870_regulator_init(void) { return platform_driver_register(&aat2870_regulator_driver); } subsys_initcall(aat2870_regulator_init); static void __exit aat2870_regulator_exit(void) { platform_driver_unregister(&aat2870_regulator_driver); } module_exit(aat2870_regulator_exit); MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");