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0009 #include <linux/kernel.h>
0010 #include <linux/init.h>
0011 #include <linux/err.h>
0012 #include <linux/module.h>
0013 #include <linux/slab.h>
0014 #include <linux/platform_device.h>
0015 #include <linux/regulator/driver.h>
0016 #include <linux/regulator/machine.h>
0017 #include <linux/mfd/aat2870.h>
0018
0019 struct aat2870_regulator {
0020 struct aat2870_data *aat2870;
0021 struct regulator_desc desc;
0022
0023 u8 enable_addr;
0024 u8 enable_shift;
0025 u8 enable_mask;
0026
0027 u8 voltage_addr;
0028 u8 voltage_shift;
0029 u8 voltage_mask;
0030 };
0031
0032 static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
0033 unsigned selector)
0034 {
0035 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
0036 struct aat2870_data *aat2870 = ri->aat2870;
0037
0038 return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
0039 selector << ri->voltage_shift);
0040 }
0041
0042 static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
0043 {
0044 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
0045 struct aat2870_data *aat2870 = ri->aat2870;
0046 u8 val;
0047 int ret;
0048
0049 ret = aat2870->read(aat2870, ri->voltage_addr, &val);
0050 if (ret)
0051 return ret;
0052
0053 return (val & ri->voltage_mask) >> ri->voltage_shift;
0054 }
0055
0056 static int aat2870_ldo_enable(struct regulator_dev *rdev)
0057 {
0058 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
0059 struct aat2870_data *aat2870 = ri->aat2870;
0060
0061 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
0062 ri->enable_mask);
0063 }
0064
0065 static int aat2870_ldo_disable(struct regulator_dev *rdev)
0066 {
0067 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
0068 struct aat2870_data *aat2870 = ri->aat2870;
0069
0070 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
0071 }
0072
0073 static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
0074 {
0075 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
0076 struct aat2870_data *aat2870 = ri->aat2870;
0077 u8 val;
0078 int ret;
0079
0080 ret = aat2870->read(aat2870, ri->enable_addr, &val);
0081 if (ret)
0082 return ret;
0083
0084 return val & ri->enable_mask ? 1 : 0;
0085 }
0086
0087 static const struct regulator_ops aat2870_ldo_ops = {
0088 .list_voltage = regulator_list_voltage_table,
0089 .map_voltage = regulator_map_voltage_ascend,
0090 .set_voltage_sel = aat2870_ldo_set_voltage_sel,
0091 .get_voltage_sel = aat2870_ldo_get_voltage_sel,
0092 .enable = aat2870_ldo_enable,
0093 .disable = aat2870_ldo_disable,
0094 .is_enabled = aat2870_ldo_is_enabled,
0095 };
0096
0097 static const unsigned int aat2870_ldo_voltages[] = {
0098 1200000, 1300000, 1500000, 1600000,
0099 1800000, 2000000, 2200000, 2500000,
0100 2600000, 2700000, 2800000, 2900000,
0101 3000000, 3100000, 3200000, 3300000,
0102 };
0103
0104 #define AAT2870_LDO(ids) \
0105 { \
0106 .desc = { \
0107 .name = #ids, \
0108 .id = AAT2870_ID_##ids, \
0109 .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
0110 .volt_table = aat2870_ldo_voltages, \
0111 .ops = &aat2870_ldo_ops, \
0112 .type = REGULATOR_VOLTAGE, \
0113 .owner = THIS_MODULE, \
0114 }, \
0115 }
0116
0117 static struct aat2870_regulator aat2870_regulators[] = {
0118 AAT2870_LDO(LDOA),
0119 AAT2870_LDO(LDOB),
0120 AAT2870_LDO(LDOC),
0121 AAT2870_LDO(LDOD),
0122 };
0123
0124 static struct aat2870_regulator *aat2870_get_regulator(int id)
0125 {
0126 struct aat2870_regulator *ri = NULL;
0127 int i;
0128
0129 for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
0130 ri = &aat2870_regulators[i];
0131 if (ri->desc.id == id)
0132 break;
0133 }
0134
0135 if (i == ARRAY_SIZE(aat2870_regulators))
0136 return NULL;
0137
0138 ri->enable_addr = AAT2870_LDO_EN;
0139 ri->enable_shift = id - AAT2870_ID_LDOA;
0140 ri->enable_mask = 0x1 << ri->enable_shift;
0141
0142 ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
0143 AAT2870_LDO_CD : AAT2870_LDO_AB;
0144 ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
0145 ri->voltage_mask = 0xF << ri->voltage_shift;
0146
0147 return ri;
0148 }
0149
0150 static int aat2870_regulator_probe(struct platform_device *pdev)
0151 {
0152 struct aat2870_regulator *ri;
0153 struct regulator_config config = { };
0154 struct regulator_dev *rdev;
0155
0156 ri = aat2870_get_regulator(pdev->id);
0157 if (!ri) {
0158 dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
0159 return -EINVAL;
0160 }
0161 ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
0162
0163 config.dev = &pdev->dev;
0164 config.driver_data = ri;
0165 config.init_data = dev_get_platdata(&pdev->dev);
0166
0167 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
0168 if (IS_ERR(rdev)) {
0169 dev_err(&pdev->dev, "Failed to register regulator %s\n",
0170 ri->desc.name);
0171 return PTR_ERR(rdev);
0172 }
0173 platform_set_drvdata(pdev, rdev);
0174
0175 return 0;
0176 }
0177
0178 static struct platform_driver aat2870_regulator_driver = {
0179 .driver = {
0180 .name = "aat2870-regulator",
0181 },
0182 .probe = aat2870_regulator_probe,
0183 };
0184
0185 static int __init aat2870_regulator_init(void)
0186 {
0187 return platform_driver_register(&aat2870_regulator_driver);
0188 }
0189 subsys_initcall(aat2870_regulator_init);
0190
0191 static void __exit aat2870_regulator_exit(void)
0192 {
0193 platform_driver_unregister(&aat2870_regulator_driver);
0194 }
0195 module_exit(aat2870_regulator_exit);
0196
0197 MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
0198 MODULE_LICENSE("GPL");
0199 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
0200 MODULE_ALIAS("platform:aat2870-regulator");
