drivers/regulator/wm8400-regulator.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 //
0003 // Regulator support for WM8400
0004 //
0005 // Copyright 2008 Wolfson Microelectronics PLC.
0006 //
0007 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
0008
0009 #include <linux/bug.h>
0010 #include <linux/err.h>
0011 #include <linux/kernel.h>
0012 #include <linux/module.h>
0013 #include <linux/regulator/driver.h>
0014 #include <linux/mfd/wm8400-private.h>
0015
0016 static const struct linear_range wm8400_ldo_ranges[] = {
0017     REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
0018     REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
0019 };
0020
0021 static const struct regulator_ops wm8400_ldo_ops = {
0022     .is_enabled = regulator_is_enabled_regmap,
0023     .enable = regulator_enable_regmap,
0024     .disable = regulator_disable_regmap,
0025     .list_voltage = regulator_list_voltage_linear_range,
0026     .get_voltage_sel = regulator_get_voltage_sel_regmap,
0027     .set_voltage_sel = regulator_set_voltage_sel_regmap,
0028     .map_voltage = regulator_map_voltage_linear_range,
0029 };
0030
0031 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
0032 {
0033     struct regmap *rmap = rdev_get_regmap(dev);
0034     int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
0035     u16 data[2];
0036     int ret;
0037
0038     ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2);
0039     if (ret != 0)
0040         return 0;
0041
0042     /* Datasheet: hibernate */
0043     if (data[0] & WM8400_DC1_SLEEP)
0044         return REGULATOR_MODE_STANDBY;
0045
0046     /* Datasheet: standby */
0047     if (!(data[0] & WM8400_DC1_ACTIVE))
0048         return REGULATOR_MODE_IDLE;
0049
0050     /* Datasheet: active with or without force PWM */
0051     if (data[1] & WM8400_DC1_FRC_PWM)
0052         return REGULATOR_MODE_FAST;
0053     else
0054         return REGULATOR_MODE_NORMAL;
0055 }
0056
0057 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
0058 {
0059     struct regmap *rmap = rdev_get_regmap(dev);
0060     int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
0061     int ret;
0062
0063     switch (mode) {
0064     case REGULATOR_MODE_FAST:
0065         /* Datasheet: active with force PWM */
0066         ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
0067                       WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
0068         if (ret != 0)
0069             return ret;
0070
0071         return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
0072                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
0073                        WM8400_DC1_ACTIVE);
0074
0075     case REGULATOR_MODE_NORMAL:
0076         /* Datasheet: active */
0077         ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
0078                       WM8400_DC1_FRC_PWM, 0);
0079         if (ret != 0)
0080             return ret;
0081
0082         return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
0083                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
0084                        WM8400_DC1_ACTIVE);
0085
0086     case REGULATOR_MODE_IDLE:
0087         /* Datasheet: standby */
0088         return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
0089                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
0090     default:
0091         return -EINVAL;
0092     }
0093 }
0094
0095 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
0096                          int input_uV, int output_uV,
0097                          int load_uA)
0098 {
0099     return REGULATOR_MODE_NORMAL;
0100 }
0101
0102 static const struct regulator_ops wm8400_dcdc_ops = {
0103     .is_enabled = regulator_is_enabled_regmap,
0104     .enable = regulator_enable_regmap,
0105     .disable = regulator_disable_regmap,
0106     .list_voltage = regulator_list_voltage_linear,
0107     .map_voltage = regulator_map_voltage_linear,
0108     .get_voltage_sel = regulator_get_voltage_sel_regmap,
0109     .set_voltage_sel = regulator_set_voltage_sel_regmap,
0110     .get_mode = wm8400_dcdc_get_mode,
0111     .set_mode = wm8400_dcdc_set_mode,
0112     .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
0113 };
0114
0115 static struct regulator_desc regulators[] = {
0116     {
0117         .name = "LDO1",
0118         .id = WM8400_LDO1,
0119         .ops = &wm8400_ldo_ops,
0120         .enable_reg = WM8400_LDO1_CONTROL,
0121         .enable_mask = WM8400_LDO1_ENA,
0122         .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
0123         .linear_ranges = wm8400_ldo_ranges,
0124         .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
0125         .vsel_reg = WM8400_LDO1_CONTROL,
0126         .vsel_mask = WM8400_LDO1_VSEL_MASK,
0127         .type = REGULATOR_VOLTAGE,
0128         .owner = THIS_MODULE,
0129     },
0130     {
0131         .name = "LDO2",
0132         .id = WM8400_LDO2,
0133         .ops = &wm8400_ldo_ops,
0134         .enable_reg = WM8400_LDO2_CONTROL,
0135         .enable_mask = WM8400_LDO2_ENA,
0136         .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
0137         .linear_ranges = wm8400_ldo_ranges,
0138         .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
0139         .type = REGULATOR_VOLTAGE,
0140         .vsel_reg = WM8400_LDO2_CONTROL,
0141         .vsel_mask = WM8400_LDO2_VSEL_MASK,
0142         .owner = THIS_MODULE,
0143     },
0144     {
0145         .name = "LDO3",
0146         .id = WM8400_LDO3,
0147         .ops = &wm8400_ldo_ops,
0148         .enable_reg = WM8400_LDO3_CONTROL,
0149         .enable_mask = WM8400_LDO3_ENA,
0150         .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
0151         .linear_ranges = wm8400_ldo_ranges,
0152         .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
0153         .vsel_reg = WM8400_LDO3_CONTROL,
0154         .vsel_mask = WM8400_LDO3_VSEL_MASK,
0155         .type = REGULATOR_VOLTAGE,
0156         .owner = THIS_MODULE,
0157     },
0158     {
0159         .name = "LDO4",
0160         .id = WM8400_LDO4,
0161         .ops = &wm8400_ldo_ops,
0162         .enable_reg = WM8400_LDO4_CONTROL,
0163         .enable_mask = WM8400_LDO4_ENA,
0164         .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
0165         .linear_ranges = wm8400_ldo_ranges,
0166         .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
0167         .vsel_reg = WM8400_LDO4_CONTROL,
0168         .vsel_mask = WM8400_LDO4_VSEL_MASK,
0169         .type = REGULATOR_VOLTAGE,
0170         .owner = THIS_MODULE,
0171     },
0172     {
0173         .name = "DCDC1",
0174         .id = WM8400_DCDC1,
0175         .ops = &wm8400_dcdc_ops,
0176         .enable_reg = WM8400_DCDC1_CONTROL_1,
0177         .enable_mask = WM8400_DC1_ENA_MASK,
0178         .n_voltages = WM8400_DC1_VSEL_MASK + 1,
0179         .vsel_reg = WM8400_DCDC1_CONTROL_1,
0180         .vsel_mask = WM8400_DC1_VSEL_MASK,
0181         .min_uV = 850000,
0182         .uV_step = 25000,
0183         .type = REGULATOR_VOLTAGE,
0184         .owner = THIS_MODULE,
0185     },
0186     {
0187         .name = "DCDC2",
0188         .id = WM8400_DCDC2,
0189         .ops = &wm8400_dcdc_ops,
0190         .enable_reg = WM8400_DCDC2_CONTROL_1,
0191         .enable_mask = WM8400_DC2_ENA_MASK,
0192         .n_voltages = WM8400_DC2_VSEL_MASK + 1,
0193         .vsel_reg = WM8400_DCDC2_CONTROL_1,
0194         .vsel_mask = WM8400_DC2_VSEL_MASK,
0195         .min_uV = 850000,
0196         .uV_step = 25000,
0197         .type = REGULATOR_VOLTAGE,
0198         .owner = THIS_MODULE,
0199     },
0200 };
0201
0202 static int wm8400_regulator_probe(struct platform_device *pdev)
0203 {
0204     struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
0205     struct regulator_config config = { };
0206     struct regulator_dev *rdev;
0207
0208     config.dev = &pdev->dev;
0209     config.init_data = dev_get_platdata(&pdev->dev);
0210     config.driver_data = wm8400;
0211     config.regmap = wm8400->regmap;
0212
0213     rdev = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
0214                        &config);
0215     if (IS_ERR(rdev))
0216         return PTR_ERR(rdev);
0217
0218     platform_set_drvdata(pdev, rdev);
0219
0220     return 0;
0221 }
0222
0223 static struct platform_driver wm8400_regulator_driver = {
0224     .driver = {
0225         .name = "wm8400-regulator",
0226     },
0227     .probe = wm8400_regulator_probe,
0228 };
0229
0230 /**
0231  * wm8400_register_regulator - enable software control of a WM8400 regulator
0232  *
0233  * This function enables software control of a WM8400 regulator via
0234  * the regulator API.  It is intended to be called from the
0235  * platform_init() callback of the WM8400 MFD driver.
0236  *
0237  * @dev:      The WM8400 device to operate on.
0238  * @reg:      The regulator to control.
0239  * @initdata: Regulator initdata for the regulator.
0240  */
0241 int wm8400_register_regulator(struct device *dev, int reg,
0242                   struct regulator_init_data *initdata)
0243 {
0244     struct wm8400 *wm8400 = dev_get_drvdata(dev);
0245
0246     if (wm8400->regulators[reg].name)
0247         return -EBUSY;
0248
0249     initdata->driver_data = wm8400;
0250
0251     wm8400->regulators[reg].name = "wm8400-regulator";
0252     wm8400->regulators[reg].id = reg;
0253     wm8400->regulators[reg].dev.parent = dev;
0254     wm8400->regulators[reg].dev.platform_data = initdata;
0255
0256     return platform_device_register(&wm8400->regulators[reg]);
0257 }
0258 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
0259
0260 static int __init wm8400_regulator_init(void)
0261 {
0262     return platform_driver_register(&wm8400_regulator_driver);
0263 }
0264 subsys_initcall(wm8400_regulator_init);
0265
0266 static void __exit wm8400_regulator_exit(void)
0267 {
0268     platform_driver_unregister(&wm8400_regulator_driver);
0269 }
0270 module_exit(wm8400_regulator_exit);
0271
0272 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
0273 MODULE_DESCRIPTION("WM8400 regulator driver");
0274 MODULE_LICENSE("GPL");
0275 MODULE_ALIAS("platform:wm8400-regulator");