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 31216765d9SMark Brown return 1600000 + ((selector - 14) * 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; 3842fad570SMark Brown 3942fad570SMark Brown if (min_uV < 900000 || min_uV > 3300000) 4042fad570SMark Brown return -EINVAL; 4142fad570SMark Brown 4242fad570SMark Brown if (min_uV < 1700000) { 4342fad570SMark Brown /* Steps of 50mV from 900mV; */ 44e9a15c8cSAxel Lin val = DIV_ROUND_UP(min_uV - 900000, 50000); 4542fad570SMark Brown 4642fad570SMark Brown if ((val * 50000) + 900000 > max_uV) 4742fad570SMark Brown return -EINVAL; 4842fad570SMark Brown BUG_ON((val * 50000) + 900000 < min_uV); 4942fad570SMark Brown } else { 5042fad570SMark Brown /* Steps of 100mV from 1700mV */ 51e9a15c8cSAxel Lin val = DIV_ROUND_UP(min_uV - 1700000, 100000); 5242fad570SMark Brown 5342fad570SMark Brown if ((val * 100000) + 1700000 > max_uV) 5442fad570SMark Brown return -EINVAL; 5542fad570SMark Brown BUG_ON((val * 100000) + 1700000 < min_uV); 5642fad570SMark Brown 5742fad570SMark Brown val += 0xf; 5842fad570SMark Brown } 5942fad570SMark Brown 607ce8a2a0SMark Brown return val; 6142fad570SMark Brown } 6242fad570SMark Brown 63c54a155dSMark Brown static struct regulator_ops wm8400_ldo_ops = { 64c54a155dSMark Brown .is_enabled = regulator_is_enabled_regmap, 65c54a155dSMark Brown .enable = regulator_enable_regmap, 66c54a155dSMark Brown .disable = regulator_disable_regmap, 67c54a155dSMark Brown .list_voltage = wm8400_ldo_list_voltage, 68c54a155dSMark Brown .get_voltage_sel = regulator_get_voltage_sel_regmap, 69c54a155dSMark Brown .set_voltage_sel = regulator_set_voltage_sel_regmap, 70c54a155dSMark Brown .map_voltage = wm8400_ldo_map_voltage, 71c54a155dSMark Brown }; 7242fad570SMark Brown 7342fad570SMark Brown static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) 7442fad570SMark Brown { 7542fad570SMark Brown struct wm8400 *wm8400 = rdev_get_drvdata(dev); 7642fad570SMark Brown int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 7742fad570SMark Brown u16 data[2]; 7842fad570SMark Brown int ret; 7942fad570SMark Brown 8042fad570SMark Brown ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, 8142fad570SMark Brown data); 8242fad570SMark Brown if (ret != 0) 8342fad570SMark Brown return 0; 8442fad570SMark Brown 8542fad570SMark Brown /* Datasheet: hibernate */ 8642fad570SMark Brown if (data[0] & WM8400_DC1_SLEEP) 8742fad570SMark Brown return REGULATOR_MODE_STANDBY; 8842fad570SMark Brown 8942fad570SMark Brown /* Datasheet: standby */ 9042fad570SMark Brown if (!(data[0] & WM8400_DC1_ACTIVE)) 9142fad570SMark Brown return REGULATOR_MODE_IDLE; 9242fad570SMark Brown 9342fad570SMark Brown /* Datasheet: active with or without force PWM */ 9442fad570SMark Brown if (data[1] & WM8400_DC1_FRC_PWM) 9542fad570SMark Brown return REGULATOR_MODE_FAST; 9642fad570SMark Brown else 9742fad570SMark Brown return REGULATOR_MODE_NORMAL; 9842fad570SMark Brown } 9942fad570SMark Brown 10042fad570SMark Brown static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) 10142fad570SMark Brown { 10242fad570SMark Brown struct wm8400 *wm8400 = rdev_get_drvdata(dev); 10342fad570SMark Brown int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 10442fad570SMark Brown int ret; 10542fad570SMark Brown 10642fad570SMark Brown switch (mode) { 10742fad570SMark Brown case REGULATOR_MODE_FAST: 10842fad570SMark Brown /* Datasheet: active with force PWM */ 10942fad570SMark Brown ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 11042fad570SMark Brown WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); 11142fad570SMark Brown if (ret != 0) 11242fad570SMark Brown return ret; 11342fad570SMark Brown 11442fad570SMark Brown return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 11542fad570SMark Brown WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 11642fad570SMark Brown WM8400_DC1_ACTIVE); 11742fad570SMark Brown 11842fad570SMark Brown case REGULATOR_MODE_NORMAL: 11942fad570SMark Brown /* Datasheet: active */ 12042fad570SMark Brown ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 12142fad570SMark Brown WM8400_DC1_FRC_PWM, 0); 12242fad570SMark Brown if (ret != 0) 12342fad570SMark Brown return ret; 12442fad570SMark Brown 12542fad570SMark Brown return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 12642fad570SMark Brown WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 12742fad570SMark Brown WM8400_DC1_ACTIVE); 12842fad570SMark Brown 12942fad570SMark Brown case REGULATOR_MODE_IDLE: 13042fad570SMark Brown /* Datasheet: standby */ 13142fad570SMark Brown ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 13242fad570SMark Brown WM8400_DC1_ACTIVE, 0); 13342fad570SMark Brown if (ret != 0) 13442fad570SMark Brown return ret; 13542fad570SMark Brown return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 13642fad570SMark Brown WM8400_DC1_SLEEP, 0); 13742fad570SMark Brown 13842fad570SMark Brown default: 13942fad570SMark Brown return -EINVAL; 14042fad570SMark Brown } 14142fad570SMark Brown } 14242fad570SMark Brown 14342fad570SMark Brown static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, 14442fad570SMark Brown int input_uV, int output_uV, 14542fad570SMark Brown int load_uA) 14642fad570SMark Brown { 14742fad570SMark Brown return REGULATOR_MODE_NORMAL; 14842fad570SMark Brown } 14942fad570SMark Brown 15042fad570SMark Brown static struct regulator_ops wm8400_dcdc_ops = { 151c54a155dSMark Brown .is_enabled = regulator_is_enabled_regmap, 152c54a155dSMark Brown .enable = regulator_enable_regmap, 153c54a155dSMark Brown .disable = regulator_disable_regmap, 154c54a155dSMark Brown .list_voltage = regulator_list_voltage_linear, 155*27eeabb7SAxel Lin .map_voltage = regulator_map_voltage_linear, 156c54a155dSMark Brown .get_voltage_sel = regulator_get_voltage_sel_regmap, 157c54a155dSMark Brown .set_voltage_sel = regulator_set_voltage_sel_regmap, 15842fad570SMark Brown .get_mode = wm8400_dcdc_get_mode, 15942fad570SMark Brown .set_mode = wm8400_dcdc_set_mode, 16042fad570SMark Brown .get_optimum_mode = wm8400_dcdc_get_optimum_mode, 16142fad570SMark Brown }; 16242fad570SMark Brown 16342fad570SMark Brown static struct regulator_desc regulators[] = { 16442fad570SMark Brown { 16542fad570SMark Brown .name = "LDO1", 16642fad570SMark Brown .id = WM8400_LDO1, 16742fad570SMark Brown .ops = &wm8400_ldo_ops, 168c54a155dSMark Brown .enable_reg = WM8400_LDO1_CONTROL, 169c54a155dSMark Brown .enable_mask = WM8400_LDO1_ENA, 170216765d9SMark Brown .n_voltages = WM8400_LDO1_VSEL_MASK + 1, 171c54a155dSMark Brown .vsel_reg = WM8400_LDO1_CONTROL, 172c54a155dSMark Brown .vsel_mask = WM8400_LDO1_VSEL_MASK, 17342fad570SMark Brown .type = REGULATOR_VOLTAGE, 17442fad570SMark Brown .owner = THIS_MODULE, 17542fad570SMark Brown }, 17642fad570SMark Brown { 17742fad570SMark Brown .name = "LDO2", 17842fad570SMark Brown .id = WM8400_LDO2, 17942fad570SMark Brown .ops = &wm8400_ldo_ops, 180c54a155dSMark Brown .enable_reg = WM8400_LDO2_CONTROL, 181c54a155dSMark Brown .enable_mask = WM8400_LDO2_ENA, 182216765d9SMark Brown .n_voltages = WM8400_LDO2_VSEL_MASK + 1, 18342fad570SMark Brown .type = REGULATOR_VOLTAGE, 184c54a155dSMark Brown .vsel_reg = WM8400_LDO2_CONTROL, 185c54a155dSMark Brown .vsel_mask = WM8400_LDO2_VSEL_MASK, 18642fad570SMark Brown .owner = THIS_MODULE, 18742fad570SMark Brown }, 18842fad570SMark Brown { 18942fad570SMark Brown .name = "LDO3", 19042fad570SMark Brown .id = WM8400_LDO3, 19142fad570SMark Brown .ops = &wm8400_ldo_ops, 192c54a155dSMark Brown .enable_reg = WM8400_LDO3_CONTROL, 193c54a155dSMark Brown .enable_mask = WM8400_LDO3_ENA, 194216765d9SMark Brown .n_voltages = WM8400_LDO3_VSEL_MASK + 1, 195c54a155dSMark Brown .vsel_reg = WM8400_LDO3_CONTROL, 196c54a155dSMark Brown .vsel_mask = WM8400_LDO3_VSEL_MASK, 19742fad570SMark Brown .type = REGULATOR_VOLTAGE, 19842fad570SMark Brown .owner = THIS_MODULE, 19942fad570SMark Brown }, 20042fad570SMark Brown { 20142fad570SMark Brown .name = "LDO4", 20242fad570SMark Brown .id = WM8400_LDO4, 20342fad570SMark Brown .ops = &wm8400_ldo_ops, 204c54a155dSMark Brown .enable_reg = WM8400_LDO4_CONTROL, 205c54a155dSMark Brown .enable_mask = WM8400_LDO4_ENA, 206216765d9SMark Brown .n_voltages = WM8400_LDO4_VSEL_MASK + 1, 207c54a155dSMark Brown .vsel_reg = WM8400_LDO4_CONTROL, 208c54a155dSMark Brown .vsel_mask = WM8400_LDO4_VSEL_MASK, 20942fad570SMark Brown .type = REGULATOR_VOLTAGE, 21042fad570SMark Brown .owner = THIS_MODULE, 21142fad570SMark Brown }, 21242fad570SMark Brown { 21342fad570SMark Brown .name = "DCDC1", 21442fad570SMark Brown .id = WM8400_DCDC1, 21542fad570SMark Brown .ops = &wm8400_dcdc_ops, 216c54a155dSMark Brown .enable_reg = WM8400_DCDC1_CONTROL_1, 217c54a155dSMark Brown .enable_mask = WM8400_DC1_ENA_MASK, 218216765d9SMark Brown .n_voltages = WM8400_DC1_VSEL_MASK + 1, 219c54a155dSMark Brown .vsel_reg = WM8400_DCDC1_CONTROL_1, 220c54a155dSMark Brown .vsel_mask = WM8400_DC1_VSEL_MASK, 221c54a155dSMark Brown .min_uV = 850000, 222c54a155dSMark Brown .uV_step = 25000, 22342fad570SMark Brown .type = REGULATOR_VOLTAGE, 22442fad570SMark Brown .owner = THIS_MODULE, 22542fad570SMark Brown }, 22642fad570SMark Brown { 22742fad570SMark Brown .name = "DCDC2", 22842fad570SMark Brown .id = WM8400_DCDC2, 22942fad570SMark Brown .ops = &wm8400_dcdc_ops, 230c54a155dSMark Brown .enable_reg = WM8400_DCDC2_CONTROL_1, 231c54a155dSMark Brown .enable_mask = WM8400_DC1_ENA_MASK, 232216765d9SMark Brown .n_voltages = WM8400_DC2_VSEL_MASK + 1, 233c54a155dSMark Brown .vsel_reg = WM8400_DCDC2_CONTROL_1, 234c54a155dSMark Brown .vsel_mask = WM8400_DC2_VSEL_MASK, 235c54a155dSMark Brown .min_uV = 850000, 236c54a155dSMark Brown .uV_step = 25000, 23742fad570SMark Brown .type = REGULATOR_VOLTAGE, 23842fad570SMark Brown .owner = THIS_MODULE, 23942fad570SMark Brown }, 24042fad570SMark Brown }; 24142fad570SMark Brown 2425dbdf735SUwe Kleine-König static int __devinit wm8400_regulator_probe(struct platform_device *pdev) 24342fad570SMark Brown { 2441ad02bbcSDmitry Torokhov struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); 245c172708dSMark Brown struct regulator_config config = { }; 24642fad570SMark Brown struct regulator_dev *rdev; 24742fad570SMark Brown 248c172708dSMark Brown config.dev = &pdev->dev; 249c172708dSMark Brown config.init_data = pdev->dev.platform_data; 250c172708dSMark Brown config.driver_data = wm8400; 251c54a155dSMark Brown config.regmap = wm8400->regmap; 25242fad570SMark Brown 253c172708dSMark Brown rdev = regulator_register(®ulators[pdev->id], &config); 25442fad570SMark Brown if (IS_ERR(rdev)) 25542fad570SMark Brown return PTR_ERR(rdev); 25642fad570SMark Brown 2571ad02bbcSDmitry Torokhov platform_set_drvdata(pdev, rdev); 2581ad02bbcSDmitry Torokhov 25942fad570SMark Brown return 0; 26042fad570SMark Brown } 26142fad570SMark Brown 26242fad570SMark Brown static int __devexit wm8400_regulator_remove(struct platform_device *pdev) 26342fad570SMark Brown { 26442fad570SMark Brown struct regulator_dev *rdev = platform_get_drvdata(pdev); 26542fad570SMark Brown 2661ad02bbcSDmitry Torokhov platform_set_drvdata(pdev, NULL); 26742fad570SMark Brown regulator_unregister(rdev); 26842fad570SMark Brown 26942fad570SMark Brown return 0; 27042fad570SMark Brown } 27142fad570SMark Brown 27242fad570SMark Brown static struct platform_driver wm8400_regulator_driver = { 27342fad570SMark Brown .driver = { 27442fad570SMark Brown .name = "wm8400-regulator", 27542fad570SMark Brown }, 27642fad570SMark Brown .probe = wm8400_regulator_probe, 27742fad570SMark Brown .remove = __devexit_p(wm8400_regulator_remove), 27842fad570SMark Brown }; 27942fad570SMark Brown 28042fad570SMark Brown /** 28142fad570SMark Brown * wm8400_register_regulator - enable software control of a WM8400 regulator 28242fad570SMark Brown * 28342fad570SMark Brown * This function enables software control of a WM8400 regulator via 28442fad570SMark Brown * the regulator API. It is intended to be called from the 28542fad570SMark Brown * platform_init() callback of the WM8400 MFD driver. 28642fad570SMark Brown * 28742fad570SMark Brown * @param dev The WM8400 device to operate on. 28842fad570SMark Brown * @param reg The regulator to control. 28942fad570SMark Brown * @param initdata Regulator initdata for the regulator. 29042fad570SMark Brown */ 29142fad570SMark Brown int wm8400_register_regulator(struct device *dev, int reg, 29242fad570SMark Brown struct regulator_init_data *initdata) 29342fad570SMark Brown { 2941909e2f6SGreg Kroah-Hartman struct wm8400 *wm8400 = dev_get_drvdata(dev); 29542fad570SMark Brown 29642fad570SMark Brown if (wm8400->regulators[reg].name) 29742fad570SMark Brown return -EBUSY; 29842fad570SMark Brown 29942fad570SMark Brown initdata->driver_data = wm8400; 30042fad570SMark Brown 30142fad570SMark Brown wm8400->regulators[reg].name = "wm8400-regulator"; 30242fad570SMark Brown wm8400->regulators[reg].id = reg; 30342fad570SMark Brown wm8400->regulators[reg].dev.parent = dev; 30442fad570SMark Brown wm8400->regulators[reg].dev.platform_data = initdata; 30542fad570SMark Brown 30642fad570SMark Brown return platform_device_register(&wm8400->regulators[reg]); 30742fad570SMark Brown } 30842fad570SMark Brown EXPORT_SYMBOL_GPL(wm8400_register_regulator); 30942fad570SMark Brown 31042fad570SMark Brown static int __init wm8400_regulator_init(void) 31142fad570SMark Brown { 31242fad570SMark Brown return platform_driver_register(&wm8400_regulator_driver); 31342fad570SMark Brown } 3145a1b22beSMark Brown subsys_initcall(wm8400_regulator_init); 31542fad570SMark Brown 31642fad570SMark Brown static void __exit wm8400_regulator_exit(void) 31742fad570SMark Brown { 31842fad570SMark Brown platform_driver_unregister(&wm8400_regulator_driver); 31942fad570SMark Brown } 32042fad570SMark Brown module_exit(wm8400_regulator_exit); 32142fad570SMark Brown 32242fad570SMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 32342fad570SMark Brown MODULE_DESCRIPTION("WM8400 regulator driver"); 32442fad570SMark Brown MODULE_LICENSE("GPL"); 32542fad570SMark Brown MODULE_ALIAS("platform:wm8400-regulator"); 326