| /* |
| * 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/platform_device.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/machine.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mfd/aat2870.h> |
| |
| struct aat2870_regulator { |
| struct aat2870_data *aat2870; |
| struct regulator_desc desc; |
| |
| u8 enable_addr; |
| u8 enable_shift; |
| u8 enable_mask; |
| |
| u8 voltage_addr; |
| u8 voltage_shift; |
| u8 voltage_mask; |
| }; |
| |
| 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 = ri->aat2870; |
| |
| 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 = ri->aat2870; |
| 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 = ri->aat2870; |
| |
| 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 = ri->aat2870; |
| |
| 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 = ri->aat2870; |
| 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 = regulator_list_voltage_table, |
| .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 unsigned 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), \ |
| .volt_table = aat2870_ldo_voltages, \ |
| .ops = &aat2870_ldo_ops, \ |
| .type = REGULATOR_VOLTAGE, \ |
| .owner = THIS_MODULE, \ |
| }, \ |
| } |
| |
| 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_config config = { }; |
| 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->aat2870 = dev_get_drvdata(pdev->dev.parent); |
| |
| config.dev = &pdev->dev; |
| config.driver_data = ri; |
| config.init_data = mfd_get_data(pdev->dev.platform_data); |
| |
| rdev = regulator_register(&ri->desc, &config); |
| 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 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 = 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>"); |
| MODULE_ALIAS("platform:aat2870-regulator"); |