142fad570SMark Brown /* 242fad570SMark Brown * Regulator support for WM8400 342fad570SMark Brown * 442fad570SMark Brown * Copyright 2008 Wolfson Microelectronics PLC. 542fad570SMark Brown * 642fad570SMark Brown * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 742fad570SMark Brown * 842fad570SMark Brown * This program is free software; you can redistribute it and/or 942fad570SMark Brown * modify it under the terms of the GNU General Public License as 1042fad570SMark Brown * published by the Free Software Foundation; either version 2 of the 1142fad570SMark Brown * License, or (at your option) any later version. 1242fad570SMark Brown * 1342fad570SMark Brown */ 1442fad570SMark Brown 1542fad570SMark Brown #include <linux/bug.h> 1642fad570SMark Brown #include <linux/err.h> 1742fad570SMark Brown #include <linux/kernel.h> 1865602c32SPaul Gortmaker #include <linux/module.h> 1942fad570SMark Brown #include <linux/regulator/driver.h> 2042fad570SMark Brown #include <linux/mfd/wm8400-private.h> 2142fad570SMark Brown 22216765d9SMark Brown static int wm8400_ldo_list_voltage(struct regulator_dev *dev, 23216765d9SMark Brown unsigned selector) 24216765d9SMark Brown { 25216765d9SMark Brown if (selector > WM8400_LDO1_VSEL_MASK) 26216765d9SMark Brown return -EINVAL; 27216765d9SMark Brown 28216765d9SMark Brown if (selector < 15) 29216765d9SMark Brown return 900000 + (selector * 50000); 30216765d9SMark Brown else 3174e20e56SAxel Lin return 1700000 + ((selector - 15) * 100000); 32216765d9SMark Brown } 33216765d9SMark Brown 34c54a155dSMark Brown static int wm8400_ldo_map_voltage(struct regulator_dev *dev, 35c54a155dSMark Brown int min_uV, int max_uV) 3642fad570SMark Brown { 3742fad570SMark Brown u16 val; 3838c20eb2SAxel Lin int volt; 3942fad570SMark Brown 4042fad570SMark Brown if (min_uV < 900000 || min_uV > 3300000) 4142fad570SMark Brown return -EINVAL; 4242fad570SMark Brown 4338c20eb2SAxel Lin if (min_uV < 1700000) /* Steps of 50mV from 900mV; */ 44e9a15c8cSAxel Lin val = DIV_ROUND_UP(min_uV - 900000, 50000); 4538c20eb2SAxel Lin else /* Steps of 100mV from 1700mV */ 4638c20eb2SAxel Lin val = DIV_ROUND_UP(min_uV - 1700000, 100000) + 15; 4742fad570SMark Brown 4838c20eb2SAxel Lin volt = wm8400_ldo_list_voltage(dev, val); 4938c20eb2SAxel Lin if (volt < min_uV || volt > max_uV) 5042fad570SMark Brown return -EINVAL; 5142fad570SMark Brown 527ce8a2a0SMark Brown return val; 5342fad570SMark Brown } 5442fad570SMark Brown 55c54a155dSMark Brown static struct regulator_ops wm8400_ldo_ops = { 56c54a155dSMark Brown .is_enabled = regulator_is_enabled_regmap, 57c54a155dSMark Brown .enable = regulator_enable_regmap, 58c54a155dSMark Brown .disable = regulator_disable_regmap, 59c54a155dSMark Brown .list_voltage = wm8400_ldo_list_voltage, 60c54a155dSMark Brown .get_voltage_sel = regulator_get_voltage_sel_regmap, 61c54a155dSMark Brown .set_voltage_sel = regulator_set_voltage_sel_regmap, 62c54a155dSMark Brown .map_voltage = wm8400_ldo_map_voltage, 63c54a155dSMark Brown }; 6442fad570SMark Brown 6542fad570SMark Brown static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) 6642fad570SMark Brown { 6742fad570SMark Brown struct wm8400 *wm8400 = rdev_get_drvdata(dev); 6842fad570SMark Brown int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 6942fad570SMark Brown u16 data[2]; 7042fad570SMark Brown int ret; 7142fad570SMark Brown 7242fad570SMark Brown ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, 7342fad570SMark Brown data); 7442fad570SMark Brown if (ret != 0) 7542fad570SMark Brown return 0; 7642fad570SMark Brown 7742fad570SMark Brown /* Datasheet: hibernate */ 7842fad570SMark Brown if (data[0] & WM8400_DC1_SLEEP) 7942fad570SMark Brown return REGULATOR_MODE_STANDBY; 8042fad570SMark Brown 8142fad570SMark Brown /* Datasheet: standby */ 8242fad570SMark Brown if (!(data[0] & WM8400_DC1_ACTIVE)) 8342fad570SMark Brown return REGULATOR_MODE_IDLE; 8442fad570SMark Brown 8542fad570SMark Brown /* Datasheet: active with or without force PWM */ 8642fad570SMark Brown if (data[1] & WM8400_DC1_FRC_PWM) 8742fad570SMark Brown return REGULATOR_MODE_FAST; 8842fad570SMark Brown else 8942fad570SMark Brown return REGULATOR_MODE_NORMAL; 9042fad570SMark Brown } 9142fad570SMark Brown 9242fad570SMark Brown static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) 9342fad570SMark Brown { 9442fad570SMark Brown struct wm8400 *wm8400 = rdev_get_drvdata(dev); 9542fad570SMark Brown int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 9642fad570SMark Brown int ret; 9742fad570SMark Brown 9842fad570SMark Brown switch (mode) { 9942fad570SMark Brown case REGULATOR_MODE_FAST: 10042fad570SMark Brown /* Datasheet: active with force PWM */ 10142fad570SMark Brown ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 10242fad570SMark Brown WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); 10342fad570SMark Brown if (ret != 0) 10442fad570SMark Brown return ret; 10542fad570SMark Brown 10642fad570SMark Brown return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 10742fad570SMark Brown WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 10842fad570SMark Brown WM8400_DC1_ACTIVE); 10942fad570SMark Brown 11042fad570SMark Brown case REGULATOR_MODE_NORMAL: 11142fad570SMark Brown /* Datasheet: active */ 11242fad570SMark Brown ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 11342fad570SMark Brown WM8400_DC1_FRC_PWM, 0); 11442fad570SMark Brown if (ret != 0) 11542fad570SMark Brown return ret; 11642fad570SMark Brown 11742fad570SMark Brown return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 11842fad570SMark Brown WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 11942fad570SMark Brown WM8400_DC1_ACTIVE); 12042fad570SMark Brown 12142fad570SMark Brown case REGULATOR_MODE_IDLE: 12242fad570SMark Brown /* Datasheet: standby */ 12342fad570SMark Brown return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 1244001376eSAxel Lin WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0); 12542fad570SMark Brown default: 12642fad570SMark Brown return -EINVAL; 12742fad570SMark Brown } 12842fad570SMark Brown } 12942fad570SMark Brown 13042fad570SMark Brown static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, 13142fad570SMark Brown int input_uV, int output_uV, 13242fad570SMark Brown int load_uA) 13342fad570SMark Brown { 13442fad570SMark Brown return REGULATOR_MODE_NORMAL; 13542fad570SMark Brown } 13642fad570SMark Brown 13742fad570SMark Brown static struct regulator_ops wm8400_dcdc_ops = { 138c54a155dSMark Brown .is_enabled = regulator_is_enabled_regmap, 139c54a155dSMark Brown .enable = regulator_enable_regmap, 140c54a155dSMark Brown .disable = regulator_disable_regmap, 141c54a155dSMark Brown .list_voltage = regulator_list_voltage_linear, 14227eeabb7SAxel Lin .map_voltage = regulator_map_voltage_linear, 143c54a155dSMark Brown .get_voltage_sel = regulator_get_voltage_sel_regmap, 144c54a155dSMark Brown .set_voltage_sel = regulator_set_voltage_sel_regmap, 14542fad570SMark Brown .get_mode = wm8400_dcdc_get_mode, 14642fad570SMark Brown .set_mode = wm8400_dcdc_set_mode, 14742fad570SMark Brown .get_optimum_mode = wm8400_dcdc_get_optimum_mode, 14842fad570SMark Brown }; 14942fad570SMark Brown 15042fad570SMark Brown static struct regulator_desc regulators[] = { 15142fad570SMark Brown { 15242fad570SMark Brown .name = "LDO1", 15342fad570SMark Brown .id = WM8400_LDO1, 15442fad570SMark Brown .ops = &wm8400_ldo_ops, 155c54a155dSMark Brown .enable_reg = WM8400_LDO1_CONTROL, 156c54a155dSMark Brown .enable_mask = WM8400_LDO1_ENA, 157216765d9SMark Brown .n_voltages = WM8400_LDO1_VSEL_MASK + 1, 158c54a155dSMark Brown .vsel_reg = WM8400_LDO1_CONTROL, 159c54a155dSMark Brown .vsel_mask = WM8400_LDO1_VSEL_MASK, 16042fad570SMark Brown .type = REGULATOR_VOLTAGE, 16142fad570SMark Brown .owner = THIS_MODULE, 16242fad570SMark Brown }, 16342fad570SMark Brown { 16442fad570SMark Brown .name = "LDO2", 16542fad570SMark Brown .id = WM8400_LDO2, 16642fad570SMark Brown .ops = &wm8400_ldo_ops, 167c54a155dSMark Brown .enable_reg = WM8400_LDO2_CONTROL, 168c54a155dSMark Brown .enable_mask = WM8400_LDO2_ENA, 169216765d9SMark Brown .n_voltages = WM8400_LDO2_VSEL_MASK + 1, 17042fad570SMark Brown .type = REGULATOR_VOLTAGE, 171c54a155dSMark Brown .vsel_reg = WM8400_LDO2_CONTROL, 172c54a155dSMark Brown .vsel_mask = WM8400_LDO2_VSEL_MASK, 17342fad570SMark Brown .owner = THIS_MODULE, 17442fad570SMark Brown }, 17542fad570SMark Brown { 17642fad570SMark Brown .name = "LDO3", 17742fad570SMark Brown .id = WM8400_LDO3, 17842fad570SMark Brown .ops = &wm8400_ldo_ops, 179c54a155dSMark Brown .enable_reg = WM8400_LDO3_CONTROL, 180c54a155dSMark Brown .enable_mask = WM8400_LDO3_ENA, 181216765d9SMark Brown .n_voltages = WM8400_LDO3_VSEL_MASK + 1, 182c54a155dSMark Brown .vsel_reg = WM8400_LDO3_CONTROL, 183c54a155dSMark Brown .vsel_mask = WM8400_LDO3_VSEL_MASK, 18442fad570SMark Brown .type = REGULATOR_VOLTAGE, 18542fad570SMark Brown .owner = THIS_MODULE, 18642fad570SMark Brown }, 18742fad570SMark Brown { 18842fad570SMark Brown .name = "LDO4", 18942fad570SMark Brown .id = WM8400_LDO4, 19042fad570SMark Brown .ops = &wm8400_ldo_ops, 191c54a155dSMark Brown .enable_reg = WM8400_LDO4_CONTROL, 192c54a155dSMark Brown .enable_mask = WM8400_LDO4_ENA, 193216765d9SMark Brown .n_voltages = WM8400_LDO4_VSEL_MASK + 1, 194c54a155dSMark Brown .vsel_reg = WM8400_LDO4_CONTROL, 195c54a155dSMark Brown .vsel_mask = WM8400_LDO4_VSEL_MASK, 19642fad570SMark Brown .type = REGULATOR_VOLTAGE, 19742fad570SMark Brown .owner = THIS_MODULE, 19842fad570SMark Brown }, 19942fad570SMark Brown { 20042fad570SMark Brown .name = "DCDC1", 20142fad570SMark Brown .id = WM8400_DCDC1, 20242fad570SMark Brown .ops = &wm8400_dcdc_ops, 203c54a155dSMark Brown .enable_reg = WM8400_DCDC1_CONTROL_1, 204c54a155dSMark Brown .enable_mask = WM8400_DC1_ENA_MASK, 205216765d9SMark Brown .n_voltages = WM8400_DC1_VSEL_MASK + 1, 206c54a155dSMark Brown .vsel_reg = WM8400_DCDC1_CONTROL_1, 207c54a155dSMark Brown .vsel_mask = WM8400_DC1_VSEL_MASK, 208c54a155dSMark Brown .min_uV = 850000, 209c54a155dSMark Brown .uV_step = 25000, 21042fad570SMark Brown .type = REGULATOR_VOLTAGE, 21142fad570SMark Brown .owner = THIS_MODULE, 21242fad570SMark Brown }, 21342fad570SMark Brown { 21442fad570SMark Brown .name = "DCDC2", 21542fad570SMark Brown .id = WM8400_DCDC2, 21642fad570SMark Brown .ops = &wm8400_dcdc_ops, 217c54a155dSMark Brown .enable_reg = WM8400_DCDC2_CONTROL_1, 218c54a155dSMark Brown .enable_mask = WM8400_DC1_ENA_MASK, 219216765d9SMark Brown .n_voltages = WM8400_DC2_VSEL_MASK + 1, 220c54a155dSMark Brown .vsel_reg = WM8400_DCDC2_CONTROL_1, 221c54a155dSMark Brown .vsel_mask = WM8400_DC2_VSEL_MASK, 222c54a155dSMark Brown .min_uV = 850000, 223c54a155dSMark Brown .uV_step = 25000, 22442fad570SMark Brown .type = REGULATOR_VOLTAGE, 22542fad570SMark Brown .owner = THIS_MODULE, 22642fad570SMark Brown }, 22742fad570SMark Brown }; 22842fad570SMark Brown 229*a5023574SBill Pemberton static int wm8400_regulator_probe(struct platform_device *pdev) 23042fad570SMark Brown { 2311ad02bbcSDmitry Torokhov struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); 232c172708dSMark Brown struct regulator_config config = { }; 23342fad570SMark Brown struct regulator_dev *rdev; 23442fad570SMark Brown 235c172708dSMark Brown config.dev = &pdev->dev; 236c172708dSMark Brown config.init_data = pdev->dev.platform_data; 237c172708dSMark Brown config.driver_data = wm8400; 238c54a155dSMark Brown config.regmap = wm8400->regmap; 23942fad570SMark Brown 240c172708dSMark Brown rdev = regulator_register(®ulators[pdev->id], &config); 24142fad570SMark Brown if (IS_ERR(rdev)) 24242fad570SMark Brown return PTR_ERR(rdev); 24342fad570SMark Brown 2441ad02bbcSDmitry Torokhov platform_set_drvdata(pdev, rdev); 2451ad02bbcSDmitry Torokhov 24642fad570SMark Brown return 0; 24742fad570SMark Brown } 24842fad570SMark Brown 24942fad570SMark Brown static int __devexit wm8400_regulator_remove(struct platform_device *pdev) 25042fad570SMark Brown { 25142fad570SMark Brown struct regulator_dev *rdev = platform_get_drvdata(pdev); 25242fad570SMark Brown 2531ad02bbcSDmitry Torokhov platform_set_drvdata(pdev, NULL); 25442fad570SMark Brown regulator_unregister(rdev); 25542fad570SMark Brown 25642fad570SMark Brown return 0; 25742fad570SMark Brown } 25842fad570SMark Brown 25942fad570SMark Brown static struct platform_driver wm8400_regulator_driver = { 26042fad570SMark Brown .driver = { 26142fad570SMark Brown .name = "wm8400-regulator", 26242fad570SMark Brown }, 26342fad570SMark Brown .probe = wm8400_regulator_probe, 2645eb9f2b9SBill Pemberton .remove = wm8400_regulator_remove, 26542fad570SMark Brown }; 26642fad570SMark Brown 26742fad570SMark Brown /** 26842fad570SMark Brown * wm8400_register_regulator - enable software control of a WM8400 regulator 26942fad570SMark Brown * 27042fad570SMark Brown * This function enables software control of a WM8400 regulator via 27142fad570SMark Brown * the regulator API. It is intended to be called from the 27242fad570SMark Brown * platform_init() callback of the WM8400 MFD driver. 27342fad570SMark Brown * 27442fad570SMark Brown * @param dev The WM8400 device to operate on. 27542fad570SMark Brown * @param reg The regulator to control. 27642fad570SMark Brown * @param initdata Regulator initdata for the regulator. 27742fad570SMark Brown */ 27842fad570SMark Brown int wm8400_register_regulator(struct device *dev, int reg, 27942fad570SMark Brown struct regulator_init_data *initdata) 28042fad570SMark Brown { 2811909e2f6SGreg Kroah-Hartman struct wm8400 *wm8400 = dev_get_drvdata(dev); 28242fad570SMark Brown 28342fad570SMark Brown if (wm8400->regulators[reg].name) 28442fad570SMark Brown return -EBUSY; 28542fad570SMark Brown 28642fad570SMark Brown initdata->driver_data = wm8400; 28742fad570SMark Brown 28842fad570SMark Brown wm8400->regulators[reg].name = "wm8400-regulator"; 28942fad570SMark Brown wm8400->regulators[reg].id = reg; 29042fad570SMark Brown wm8400->regulators[reg].dev.parent = dev; 29142fad570SMark Brown wm8400->regulators[reg].dev.platform_data = initdata; 29242fad570SMark Brown 29342fad570SMark Brown return platform_device_register(&wm8400->regulators[reg]); 29442fad570SMark Brown } 29542fad570SMark Brown EXPORT_SYMBOL_GPL(wm8400_register_regulator); 29642fad570SMark Brown 29742fad570SMark Brown static int __init wm8400_regulator_init(void) 29842fad570SMark Brown { 29942fad570SMark Brown return platform_driver_register(&wm8400_regulator_driver); 30042fad570SMark Brown } 3015a1b22beSMark Brown subsys_initcall(wm8400_regulator_init); 30242fad570SMark Brown 30342fad570SMark Brown static void __exit wm8400_regulator_exit(void) 30442fad570SMark Brown { 30542fad570SMark Brown platform_driver_unregister(&wm8400_regulator_driver); 30642fad570SMark Brown } 30742fad570SMark Brown module_exit(wm8400_regulator_exit); 30842fad570SMark Brown 30942fad570SMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 31042fad570SMark Brown MODULE_DESCRIPTION("WM8400 regulator driver"); 31142fad570SMark Brown MODULE_LICENSE("GPL"); 31242fad570SMark Brown MODULE_ALIAS("platform:wm8400-regulator"); 313