108ff6f2aSHaojian Zhuang /* 208ff6f2aSHaojian Zhuang * Regulators driver for Maxim max8925 308ff6f2aSHaojian Zhuang * 408ff6f2aSHaojian Zhuang * Copyright (C) 2009 Marvell International Ltd. 508ff6f2aSHaojian Zhuang * Haojian Zhuang <haojian.zhuang@marvell.com> 608ff6f2aSHaojian Zhuang * 708ff6f2aSHaojian Zhuang * This program is free software; you can redistribute it and/or modify 808ff6f2aSHaojian Zhuang * it under the terms of the GNU General Public License version 2 as 908ff6f2aSHaojian Zhuang * published by the Free Software Foundation. 1008ff6f2aSHaojian Zhuang */ 1108ff6f2aSHaojian Zhuang #include <linux/kernel.h> 1265602c32SPaul Gortmaker #include <linux/module.h> 1308ff6f2aSHaojian Zhuang #include <linux/init.h> 1408ff6f2aSHaojian Zhuang #include <linux/err.h> 1508ff6f2aSHaojian Zhuang #include <linux/i2c.h> 1608ff6f2aSHaojian Zhuang #include <linux/platform_device.h> 1708ff6f2aSHaojian Zhuang #include <linux/regulator/driver.h> 1808ff6f2aSHaojian Zhuang #include <linux/regulator/machine.h> 1908ff6f2aSHaojian Zhuang #include <linux/mfd/max8925.h> 2008ff6f2aSHaojian Zhuang 2108ff6f2aSHaojian Zhuang #define SD1_DVM_VMIN 850000 2208ff6f2aSHaojian Zhuang #define SD1_DVM_VMAX 1000000 2308ff6f2aSHaojian Zhuang #define SD1_DVM_STEP 50000 2408ff6f2aSHaojian Zhuang #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ 2508ff6f2aSHaojian Zhuang #define SD1_DVM_EN 6 /* SDV1 bit 6 */ 2608ff6f2aSHaojian Zhuang 2765364e9aSKevin Liu /* bit definitions in LDO control registers */ 2865364e9aSKevin Liu #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ 2965364e9aSKevin Liu #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ 3065364e9aSKevin Liu #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ 3165364e9aSKevin Liu #define LDO_I2C_EN 0x1 /* Enable by i2c */ 3265364e9aSKevin Liu #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ 3365364e9aSKevin Liu #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ 34db13c040SHaojian Zhuang 3508ff6f2aSHaojian Zhuang struct max8925_regulator_info { 3608ff6f2aSHaojian Zhuang struct regulator_desc desc; 3708ff6f2aSHaojian Zhuang struct regulator_dev *regulator; 3808ff6f2aSHaojian Zhuang struct i2c_client *i2c; 3908ff6f2aSHaojian Zhuang struct max8925_chip *chip; 4008ff6f2aSHaojian Zhuang 4108ff6f2aSHaojian Zhuang int max_uV; 4208ff6f2aSHaojian Zhuang int vol_reg; 4308ff6f2aSHaojian Zhuang int enable_reg; 4408ff6f2aSHaojian Zhuang }; 4508ff6f2aSHaojian Zhuang 4608ff6f2aSHaojian Zhuang static inline int check_range(struct max8925_regulator_info *info, 4708ff6f2aSHaojian Zhuang int min_uV, int max_uV) 4808ff6f2aSHaojian Zhuang { 494093e739SAxel Lin if (min_uV < info->desc.min_uV || min_uV > info->max_uV) 5008ff6f2aSHaojian Zhuang return -EINVAL; 5108ff6f2aSHaojian Zhuang 5208ff6f2aSHaojian Zhuang return 0; 5308ff6f2aSHaojian Zhuang } 5408ff6f2aSHaojian Zhuang 55*cd8318cbSAxel Lin static int max8925_set_voltage_sel(struct regulator_dev *rdev, 56*cd8318cbSAxel Lin unsigned int selector) 5708ff6f2aSHaojian Zhuang { 5808ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 59*cd8318cbSAxel Lin unsigned char mask = rdev->desc->n_voltages - 1; 6008ff6f2aSHaojian Zhuang 61*cd8318cbSAxel Lin return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); 6208ff6f2aSHaojian Zhuang } 6308ff6f2aSHaojian Zhuang 643c8983b9SAxel Lin static int max8925_get_voltage_sel(struct regulator_dev *rdev) 6508ff6f2aSHaojian Zhuang { 6608ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 6708ff6f2aSHaojian Zhuang unsigned char data, mask; 6808ff6f2aSHaojian Zhuang int ret; 6908ff6f2aSHaojian Zhuang 7008ff6f2aSHaojian Zhuang ret = max8925_reg_read(info->i2c, info->vol_reg); 7108ff6f2aSHaojian Zhuang if (ret < 0) 7208ff6f2aSHaojian Zhuang return ret; 737f52ba77SAxel Lin mask = rdev->desc->n_voltages - 1; 747f52ba77SAxel Lin data = ret & mask; 7508ff6f2aSHaojian Zhuang 763c8983b9SAxel Lin return data; 7708ff6f2aSHaojian Zhuang } 7808ff6f2aSHaojian Zhuang 7908ff6f2aSHaojian Zhuang static int max8925_enable(struct regulator_dev *rdev) 8008ff6f2aSHaojian Zhuang { 8108ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 8208ff6f2aSHaojian Zhuang 8308ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, 8465364e9aSKevin Liu LDO_SEQ_MASK << LDO_SEQ_SHIFT | 8565364e9aSKevin Liu LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 8665364e9aSKevin Liu LDO_SEQ_I2C << LDO_SEQ_SHIFT | 8765364e9aSKevin Liu LDO_I2C_EN << LDO_I2C_EN_SHIFT); 8808ff6f2aSHaojian Zhuang } 8908ff6f2aSHaojian Zhuang 9008ff6f2aSHaojian Zhuang static int max8925_disable(struct regulator_dev *rdev) 9108ff6f2aSHaojian Zhuang { 9208ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 9308ff6f2aSHaojian Zhuang 9408ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, 9565364e9aSKevin Liu LDO_SEQ_MASK << LDO_SEQ_SHIFT | 9665364e9aSKevin Liu LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 9765364e9aSKevin Liu LDO_SEQ_I2C << LDO_SEQ_SHIFT); 9808ff6f2aSHaojian Zhuang } 9908ff6f2aSHaojian Zhuang 10008ff6f2aSHaojian Zhuang static int max8925_is_enabled(struct regulator_dev *rdev) 10108ff6f2aSHaojian Zhuang { 10208ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 10365364e9aSKevin Liu int ldo_seq, ret; 10408ff6f2aSHaojian Zhuang 1054b99fef0SHaojian Zhuang ret = max8925_reg_read(info->i2c, info->enable_reg); 10608ff6f2aSHaojian Zhuang if (ret < 0) 10708ff6f2aSHaojian Zhuang return ret; 10865364e9aSKevin Liu ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; 10965364e9aSKevin Liu if (ldo_seq != LDO_SEQ_I2C) 11065364e9aSKevin Liu return 1; 11165364e9aSKevin Liu else 11265364e9aSKevin Liu return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); 11308ff6f2aSHaojian Zhuang } 11408ff6f2aSHaojian Zhuang 11508ff6f2aSHaojian Zhuang static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) 11608ff6f2aSHaojian Zhuang { 11708ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 11808ff6f2aSHaojian Zhuang unsigned char data, mask; 11908ff6f2aSHaojian Zhuang 12008ff6f2aSHaojian Zhuang if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) 12108ff6f2aSHaojian Zhuang return -EINVAL; 12208ff6f2aSHaojian Zhuang 1235db6d09aSAxel Lin data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); 12408ff6f2aSHaojian Zhuang data <<= SD1_DVM_SHIFT; 12508ff6f2aSHaojian Zhuang mask = 3 << SD1_DVM_SHIFT; 12608ff6f2aSHaojian Zhuang 12708ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, mask, data); 12808ff6f2aSHaojian Zhuang } 12908ff6f2aSHaojian Zhuang 13008ff6f2aSHaojian Zhuang static int max8925_set_dvm_enable(struct regulator_dev *rdev) 13108ff6f2aSHaojian Zhuang { 13208ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 13308ff6f2aSHaojian Zhuang 13408ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 13508ff6f2aSHaojian Zhuang 1 << SD1_DVM_EN); 13608ff6f2aSHaojian Zhuang } 13708ff6f2aSHaojian Zhuang 13808ff6f2aSHaojian Zhuang static int max8925_set_dvm_disable(struct regulator_dev *rdev) 13908ff6f2aSHaojian Zhuang { 14008ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 14108ff6f2aSHaojian Zhuang 14208ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); 14308ff6f2aSHaojian Zhuang } 14408ff6f2aSHaojian Zhuang 14508ff6f2aSHaojian Zhuang static struct regulator_ops max8925_regulator_sdv_ops = { 146*cd8318cbSAxel Lin .map_voltage = regulator_map_voltage_linear, 1474093e739SAxel Lin .list_voltage = regulator_list_voltage_linear, 148*cd8318cbSAxel Lin .set_voltage_sel = max8925_set_voltage_sel, 1493c8983b9SAxel Lin .get_voltage_sel = max8925_get_voltage_sel, 15008ff6f2aSHaojian Zhuang .enable = max8925_enable, 15108ff6f2aSHaojian Zhuang .disable = max8925_disable, 15208ff6f2aSHaojian Zhuang .is_enabled = max8925_is_enabled, 15308ff6f2aSHaojian Zhuang .set_suspend_voltage = max8925_set_dvm_voltage, 15408ff6f2aSHaojian Zhuang .set_suspend_enable = max8925_set_dvm_enable, 15508ff6f2aSHaojian Zhuang .set_suspend_disable = max8925_set_dvm_disable, 15608ff6f2aSHaojian Zhuang }; 15708ff6f2aSHaojian Zhuang 15808ff6f2aSHaojian Zhuang static struct regulator_ops max8925_regulator_ldo_ops = { 159*cd8318cbSAxel Lin .map_voltage = regulator_map_voltage_linear, 1604093e739SAxel Lin .list_voltage = regulator_list_voltage_linear, 161*cd8318cbSAxel Lin .set_voltage_sel = max8925_set_voltage_sel, 1623c8983b9SAxel Lin .get_voltage_sel = max8925_get_voltage_sel, 16308ff6f2aSHaojian Zhuang .enable = max8925_enable, 16408ff6f2aSHaojian Zhuang .disable = max8925_disable, 16508ff6f2aSHaojian Zhuang .is_enabled = max8925_is_enabled, 16608ff6f2aSHaojian Zhuang }; 16708ff6f2aSHaojian Zhuang 16808ff6f2aSHaojian Zhuang #define MAX8925_SDV(_id, min, max, step) \ 16908ff6f2aSHaojian Zhuang { \ 17008ff6f2aSHaojian Zhuang .desc = { \ 17108ff6f2aSHaojian Zhuang .name = "SDV" #_id, \ 17208ff6f2aSHaojian Zhuang .ops = &max8925_regulator_sdv_ops, \ 17308ff6f2aSHaojian Zhuang .type = REGULATOR_VOLTAGE, \ 17408ff6f2aSHaojian Zhuang .id = MAX8925_ID_SD##_id, \ 17508ff6f2aSHaojian Zhuang .owner = THIS_MODULE, \ 1767f52ba77SAxel Lin .n_voltages = 64, \ 17708ff6f2aSHaojian Zhuang .min_uV = min * 1000, \ 1784093e739SAxel Lin .uV_step = step * 1000, \ 1794093e739SAxel Lin }, \ 18008ff6f2aSHaojian Zhuang .max_uV = max * 1000, \ 18108ff6f2aSHaojian Zhuang .vol_reg = MAX8925_SDV##_id, \ 18208ff6f2aSHaojian Zhuang .enable_reg = MAX8925_SDCTL##_id, \ 18308ff6f2aSHaojian Zhuang } 18408ff6f2aSHaojian Zhuang 18508ff6f2aSHaojian Zhuang #define MAX8925_LDO(_id, min, max, step) \ 18608ff6f2aSHaojian Zhuang { \ 18708ff6f2aSHaojian Zhuang .desc = { \ 18808ff6f2aSHaojian Zhuang .name = "LDO" #_id, \ 18908ff6f2aSHaojian Zhuang .ops = &max8925_regulator_ldo_ops, \ 19008ff6f2aSHaojian Zhuang .type = REGULATOR_VOLTAGE, \ 19108ff6f2aSHaojian Zhuang .id = MAX8925_ID_LDO##_id, \ 19208ff6f2aSHaojian Zhuang .owner = THIS_MODULE, \ 1937f52ba77SAxel Lin .n_voltages = 64, \ 19408ff6f2aSHaojian Zhuang .min_uV = min * 1000, \ 1954093e739SAxel Lin .uV_step = step * 1000, \ 1964093e739SAxel Lin }, \ 19708ff6f2aSHaojian Zhuang .max_uV = max * 1000, \ 19808ff6f2aSHaojian Zhuang .vol_reg = MAX8925_LDOVOUT##_id, \ 19908ff6f2aSHaojian Zhuang .enable_reg = MAX8925_LDOCTL##_id, \ 20008ff6f2aSHaojian Zhuang } 20108ff6f2aSHaojian Zhuang 20208ff6f2aSHaojian Zhuang static struct max8925_regulator_info max8925_regulator_info[] = { 20308ff6f2aSHaojian Zhuang MAX8925_SDV(1, 637.5, 1425, 12.5), 20408ff6f2aSHaojian Zhuang MAX8925_SDV(2, 650, 2225, 25), 20508ff6f2aSHaojian Zhuang MAX8925_SDV(3, 750, 3900, 50), 20608ff6f2aSHaojian Zhuang 20708ff6f2aSHaojian Zhuang MAX8925_LDO(1, 750, 3900, 50), 20808ff6f2aSHaojian Zhuang MAX8925_LDO(2, 650, 2250, 25), 20908ff6f2aSHaojian Zhuang MAX8925_LDO(3, 650, 2250, 25), 21008ff6f2aSHaojian Zhuang MAX8925_LDO(4, 750, 3900, 50), 21108ff6f2aSHaojian Zhuang MAX8925_LDO(5, 750, 3900, 50), 21208ff6f2aSHaojian Zhuang MAX8925_LDO(6, 750, 3900, 50), 21308ff6f2aSHaojian Zhuang MAX8925_LDO(7, 750, 3900, 50), 21408ff6f2aSHaojian Zhuang MAX8925_LDO(8, 750, 3900, 50), 21508ff6f2aSHaojian Zhuang MAX8925_LDO(9, 750, 3900, 50), 21608ff6f2aSHaojian Zhuang MAX8925_LDO(10, 750, 3900, 50), 21708ff6f2aSHaojian Zhuang MAX8925_LDO(11, 750, 3900, 50), 21808ff6f2aSHaojian Zhuang MAX8925_LDO(12, 750, 3900, 50), 21908ff6f2aSHaojian Zhuang MAX8925_LDO(13, 750, 3900, 50), 22008ff6f2aSHaojian Zhuang MAX8925_LDO(14, 750, 3900, 50), 22108ff6f2aSHaojian Zhuang MAX8925_LDO(15, 750, 3900, 50), 22208ff6f2aSHaojian Zhuang MAX8925_LDO(16, 750, 3900, 50), 22308ff6f2aSHaojian Zhuang MAX8925_LDO(17, 650, 2250, 25), 22408ff6f2aSHaojian Zhuang MAX8925_LDO(18, 650, 2250, 25), 22508ff6f2aSHaojian Zhuang MAX8925_LDO(19, 750, 3900, 50), 22608ff6f2aSHaojian Zhuang MAX8925_LDO(20, 750, 3900, 50), 22708ff6f2aSHaojian Zhuang }; 22808ff6f2aSHaojian Zhuang 2293fff6c04SDmitry Torokhov static struct max8925_regulator_info * __devinit find_regulator_info(int id) 23008ff6f2aSHaojian Zhuang { 23108ff6f2aSHaojian Zhuang struct max8925_regulator_info *ri; 23208ff6f2aSHaojian Zhuang int i; 23308ff6f2aSHaojian Zhuang 23408ff6f2aSHaojian Zhuang for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { 23508ff6f2aSHaojian Zhuang ri = &max8925_regulator_info[i]; 23608ff6f2aSHaojian Zhuang if (ri->desc.id == id) 23708ff6f2aSHaojian Zhuang return ri; 23808ff6f2aSHaojian Zhuang } 23908ff6f2aSHaojian Zhuang return NULL; 24008ff6f2aSHaojian Zhuang } 24108ff6f2aSHaojian Zhuang 24208ff6f2aSHaojian Zhuang static int __devinit max8925_regulator_probe(struct platform_device *pdev) 24308ff6f2aSHaojian Zhuang { 24408ff6f2aSHaojian Zhuang struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 24508ff6f2aSHaojian Zhuang struct max8925_platform_data *pdata = chip->dev->platform_data; 246c172708dSMark Brown struct regulator_config config = { }; 2473fff6c04SDmitry Torokhov struct max8925_regulator_info *ri; 24808ff6f2aSHaojian Zhuang struct regulator_dev *rdev; 24908ff6f2aSHaojian Zhuang 25008ff6f2aSHaojian Zhuang ri = find_regulator_info(pdev->id); 25108ff6f2aSHaojian Zhuang if (ri == NULL) { 25208ff6f2aSHaojian Zhuang dev_err(&pdev->dev, "invalid regulator ID specified\n"); 25308ff6f2aSHaojian Zhuang return -EINVAL; 25408ff6f2aSHaojian Zhuang } 25508ff6f2aSHaojian Zhuang ri->i2c = chip->i2c; 25608ff6f2aSHaojian Zhuang ri->chip = chip; 25708ff6f2aSHaojian Zhuang 258c172708dSMark Brown config.dev = &pdev->dev; 259c172708dSMark Brown config.init_data = pdata->regulator[pdev->id]; 260c172708dSMark Brown config.driver_data = ri; 261c172708dSMark Brown 262c172708dSMark Brown rdev = regulator_register(&ri->desc, &config); 26308ff6f2aSHaojian Zhuang if (IS_ERR(rdev)) { 26408ff6f2aSHaojian Zhuang dev_err(&pdev->dev, "failed to register regulator %s\n", 26508ff6f2aSHaojian Zhuang ri->desc.name); 26608ff6f2aSHaojian Zhuang return PTR_ERR(rdev); 26708ff6f2aSHaojian Zhuang } 26808ff6f2aSHaojian Zhuang 26908ff6f2aSHaojian Zhuang platform_set_drvdata(pdev, rdev); 27008ff6f2aSHaojian Zhuang return 0; 27108ff6f2aSHaojian Zhuang } 27208ff6f2aSHaojian Zhuang 27308ff6f2aSHaojian Zhuang static int __devexit max8925_regulator_remove(struct platform_device *pdev) 27408ff6f2aSHaojian Zhuang { 27508ff6f2aSHaojian Zhuang struct regulator_dev *rdev = platform_get_drvdata(pdev); 27608ff6f2aSHaojian Zhuang 2773fff6c04SDmitry Torokhov platform_set_drvdata(pdev, NULL); 27808ff6f2aSHaojian Zhuang regulator_unregister(rdev); 2793fff6c04SDmitry Torokhov 28008ff6f2aSHaojian Zhuang return 0; 28108ff6f2aSHaojian Zhuang } 28208ff6f2aSHaojian Zhuang 28308ff6f2aSHaojian Zhuang static struct platform_driver max8925_regulator_driver = { 28408ff6f2aSHaojian Zhuang .driver = { 28508ff6f2aSHaojian Zhuang .name = "max8925-regulator", 28608ff6f2aSHaojian Zhuang .owner = THIS_MODULE, 28708ff6f2aSHaojian Zhuang }, 28808ff6f2aSHaojian Zhuang .probe = max8925_regulator_probe, 28908ff6f2aSHaojian Zhuang .remove = __devexit_p(max8925_regulator_remove), 29008ff6f2aSHaojian Zhuang }; 29108ff6f2aSHaojian Zhuang 29208ff6f2aSHaojian Zhuang static int __init max8925_regulator_init(void) 29308ff6f2aSHaojian Zhuang { 29408ff6f2aSHaojian Zhuang return platform_driver_register(&max8925_regulator_driver); 29508ff6f2aSHaojian Zhuang } 29608ff6f2aSHaojian Zhuang subsys_initcall(max8925_regulator_init); 29708ff6f2aSHaojian Zhuang 29808ff6f2aSHaojian Zhuang static void __exit max8925_regulator_exit(void) 29908ff6f2aSHaojian Zhuang { 30008ff6f2aSHaojian Zhuang platform_driver_unregister(&max8925_regulator_driver); 30108ff6f2aSHaojian Zhuang } 30208ff6f2aSHaojian Zhuang module_exit(max8925_regulator_exit); 30308ff6f2aSHaojian Zhuang 30408ff6f2aSHaojian Zhuang MODULE_LICENSE("GPL"); 30508ff6f2aSHaojian Zhuang MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 30608ff6f2aSHaojian Zhuang MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); 30708ff6f2aSHaojian Zhuang MODULE_ALIAS("platform:max8925-regulator"); 308