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 vol_reg; 4208ff6f2aSHaojian Zhuang int enable_reg; 4308ff6f2aSHaojian Zhuang }; 4408ff6f2aSHaojian Zhuang 45cd8318cbSAxel Lin static int max8925_set_voltage_sel(struct regulator_dev *rdev, 46cd8318cbSAxel Lin unsigned int selector) 4708ff6f2aSHaojian Zhuang { 4808ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 49cd8318cbSAxel Lin unsigned char mask = rdev->desc->n_voltages - 1; 5008ff6f2aSHaojian Zhuang 51cd8318cbSAxel Lin return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); 5208ff6f2aSHaojian Zhuang } 5308ff6f2aSHaojian Zhuang 543c8983b9SAxel Lin static int max8925_get_voltage_sel(struct regulator_dev *rdev) 5508ff6f2aSHaojian Zhuang { 5608ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 5708ff6f2aSHaojian Zhuang unsigned char data, mask; 5808ff6f2aSHaojian Zhuang int ret; 5908ff6f2aSHaojian Zhuang 6008ff6f2aSHaojian Zhuang ret = max8925_reg_read(info->i2c, info->vol_reg); 6108ff6f2aSHaojian Zhuang if (ret < 0) 6208ff6f2aSHaojian Zhuang return ret; 637f52ba77SAxel Lin mask = rdev->desc->n_voltages - 1; 647f52ba77SAxel Lin data = ret & mask; 6508ff6f2aSHaojian Zhuang 663c8983b9SAxel Lin return data; 6708ff6f2aSHaojian Zhuang } 6808ff6f2aSHaojian Zhuang 6908ff6f2aSHaojian Zhuang static int max8925_enable(struct regulator_dev *rdev) 7008ff6f2aSHaojian Zhuang { 7108ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 7208ff6f2aSHaojian Zhuang 7308ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, 7465364e9aSKevin Liu LDO_SEQ_MASK << LDO_SEQ_SHIFT | 7565364e9aSKevin Liu LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 7665364e9aSKevin Liu LDO_SEQ_I2C << LDO_SEQ_SHIFT | 7765364e9aSKevin Liu LDO_I2C_EN << LDO_I2C_EN_SHIFT); 7808ff6f2aSHaojian Zhuang } 7908ff6f2aSHaojian Zhuang 8008ff6f2aSHaojian Zhuang static int max8925_disable(struct regulator_dev *rdev) 8108ff6f2aSHaojian Zhuang { 8208ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 8308ff6f2aSHaojian Zhuang 8408ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, 8565364e9aSKevin Liu LDO_SEQ_MASK << LDO_SEQ_SHIFT | 8665364e9aSKevin Liu LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 8765364e9aSKevin Liu LDO_SEQ_I2C << LDO_SEQ_SHIFT); 8808ff6f2aSHaojian Zhuang } 8908ff6f2aSHaojian Zhuang 9008ff6f2aSHaojian Zhuang static int max8925_is_enabled(struct regulator_dev *rdev) 9108ff6f2aSHaojian Zhuang { 9208ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 9365364e9aSKevin Liu int ldo_seq, ret; 9408ff6f2aSHaojian Zhuang 954b99fef0SHaojian Zhuang ret = max8925_reg_read(info->i2c, info->enable_reg); 9608ff6f2aSHaojian Zhuang if (ret < 0) 9708ff6f2aSHaojian Zhuang return ret; 9865364e9aSKevin Liu ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; 9965364e9aSKevin Liu if (ldo_seq != LDO_SEQ_I2C) 10065364e9aSKevin Liu return 1; 10165364e9aSKevin Liu else 10265364e9aSKevin Liu return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); 10308ff6f2aSHaojian Zhuang } 10408ff6f2aSHaojian Zhuang 10508ff6f2aSHaojian Zhuang static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) 10608ff6f2aSHaojian Zhuang { 10708ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 10808ff6f2aSHaojian Zhuang unsigned char data, mask; 10908ff6f2aSHaojian Zhuang 11008ff6f2aSHaojian Zhuang if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) 11108ff6f2aSHaojian Zhuang return -EINVAL; 11208ff6f2aSHaojian Zhuang 1135db6d09aSAxel Lin data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); 11408ff6f2aSHaojian Zhuang data <<= SD1_DVM_SHIFT; 11508ff6f2aSHaojian Zhuang mask = 3 << SD1_DVM_SHIFT; 11608ff6f2aSHaojian Zhuang 11708ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, mask, data); 11808ff6f2aSHaojian Zhuang } 11908ff6f2aSHaojian Zhuang 12008ff6f2aSHaojian Zhuang static int max8925_set_dvm_enable(struct regulator_dev *rdev) 12108ff6f2aSHaojian Zhuang { 12208ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 12308ff6f2aSHaojian Zhuang 12408ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 12508ff6f2aSHaojian Zhuang 1 << SD1_DVM_EN); 12608ff6f2aSHaojian Zhuang } 12708ff6f2aSHaojian Zhuang 12808ff6f2aSHaojian Zhuang static int max8925_set_dvm_disable(struct regulator_dev *rdev) 12908ff6f2aSHaojian Zhuang { 13008ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 13108ff6f2aSHaojian Zhuang 13208ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); 13308ff6f2aSHaojian Zhuang } 13408ff6f2aSHaojian Zhuang 13508ff6f2aSHaojian Zhuang static struct regulator_ops max8925_regulator_sdv_ops = { 136cd8318cbSAxel Lin .map_voltage = regulator_map_voltage_linear, 1374093e739SAxel Lin .list_voltage = regulator_list_voltage_linear, 138cd8318cbSAxel Lin .set_voltage_sel = max8925_set_voltage_sel, 1393c8983b9SAxel Lin .get_voltage_sel = max8925_get_voltage_sel, 14008ff6f2aSHaojian Zhuang .enable = max8925_enable, 14108ff6f2aSHaojian Zhuang .disable = max8925_disable, 14208ff6f2aSHaojian Zhuang .is_enabled = max8925_is_enabled, 14308ff6f2aSHaojian Zhuang .set_suspend_voltage = max8925_set_dvm_voltage, 14408ff6f2aSHaojian Zhuang .set_suspend_enable = max8925_set_dvm_enable, 14508ff6f2aSHaojian Zhuang .set_suspend_disable = max8925_set_dvm_disable, 14608ff6f2aSHaojian Zhuang }; 14708ff6f2aSHaojian Zhuang 14808ff6f2aSHaojian Zhuang static struct regulator_ops max8925_regulator_ldo_ops = { 149cd8318cbSAxel Lin .map_voltage = regulator_map_voltage_linear, 1504093e739SAxel Lin .list_voltage = regulator_list_voltage_linear, 151cd8318cbSAxel Lin .set_voltage_sel = max8925_set_voltage_sel, 1523c8983b9SAxel Lin .get_voltage_sel = max8925_get_voltage_sel, 15308ff6f2aSHaojian Zhuang .enable = max8925_enable, 15408ff6f2aSHaojian Zhuang .disable = max8925_disable, 15508ff6f2aSHaojian Zhuang .is_enabled = max8925_is_enabled, 15608ff6f2aSHaojian Zhuang }; 15708ff6f2aSHaojian Zhuang 15808ff6f2aSHaojian Zhuang #define MAX8925_SDV(_id, min, max, step) \ 15908ff6f2aSHaojian Zhuang { \ 16008ff6f2aSHaojian Zhuang .desc = { \ 16108ff6f2aSHaojian Zhuang .name = "SDV" #_id, \ 16208ff6f2aSHaojian Zhuang .ops = &max8925_regulator_sdv_ops, \ 16308ff6f2aSHaojian Zhuang .type = REGULATOR_VOLTAGE, \ 16408ff6f2aSHaojian Zhuang .id = MAX8925_ID_SD##_id, \ 16508ff6f2aSHaojian Zhuang .owner = THIS_MODULE, \ 1667f52ba77SAxel Lin .n_voltages = 64, \ 16708ff6f2aSHaojian Zhuang .min_uV = min * 1000, \ 1684093e739SAxel Lin .uV_step = step * 1000, \ 1694093e739SAxel Lin }, \ 17008ff6f2aSHaojian Zhuang .vol_reg = MAX8925_SDV##_id, \ 17108ff6f2aSHaojian Zhuang .enable_reg = MAX8925_SDCTL##_id, \ 17208ff6f2aSHaojian Zhuang } 17308ff6f2aSHaojian Zhuang 17408ff6f2aSHaojian Zhuang #define MAX8925_LDO(_id, min, max, step) \ 17508ff6f2aSHaojian Zhuang { \ 17608ff6f2aSHaojian Zhuang .desc = { \ 17708ff6f2aSHaojian Zhuang .name = "LDO" #_id, \ 17808ff6f2aSHaojian Zhuang .ops = &max8925_regulator_ldo_ops, \ 17908ff6f2aSHaojian Zhuang .type = REGULATOR_VOLTAGE, \ 18008ff6f2aSHaojian Zhuang .id = MAX8925_ID_LDO##_id, \ 18108ff6f2aSHaojian Zhuang .owner = THIS_MODULE, \ 1827f52ba77SAxel Lin .n_voltages = 64, \ 18308ff6f2aSHaojian Zhuang .min_uV = min * 1000, \ 1844093e739SAxel Lin .uV_step = step * 1000, \ 1854093e739SAxel Lin }, \ 18608ff6f2aSHaojian Zhuang .vol_reg = MAX8925_LDOVOUT##_id, \ 18708ff6f2aSHaojian Zhuang .enable_reg = MAX8925_LDOCTL##_id, \ 18808ff6f2aSHaojian Zhuang } 18908ff6f2aSHaojian Zhuang 19008ff6f2aSHaojian Zhuang static struct max8925_regulator_info max8925_regulator_info[] = { 19108ff6f2aSHaojian Zhuang MAX8925_SDV(1, 637.5, 1425, 12.5), 19208ff6f2aSHaojian Zhuang MAX8925_SDV(2, 650, 2225, 25), 19308ff6f2aSHaojian Zhuang MAX8925_SDV(3, 750, 3900, 50), 19408ff6f2aSHaojian Zhuang 19508ff6f2aSHaojian Zhuang MAX8925_LDO(1, 750, 3900, 50), 19608ff6f2aSHaojian Zhuang MAX8925_LDO(2, 650, 2250, 25), 19708ff6f2aSHaojian Zhuang MAX8925_LDO(3, 650, 2250, 25), 19808ff6f2aSHaojian Zhuang MAX8925_LDO(4, 750, 3900, 50), 19908ff6f2aSHaojian Zhuang MAX8925_LDO(5, 750, 3900, 50), 20008ff6f2aSHaojian Zhuang MAX8925_LDO(6, 750, 3900, 50), 20108ff6f2aSHaojian Zhuang MAX8925_LDO(7, 750, 3900, 50), 20208ff6f2aSHaojian Zhuang MAX8925_LDO(8, 750, 3900, 50), 20308ff6f2aSHaojian Zhuang MAX8925_LDO(9, 750, 3900, 50), 20408ff6f2aSHaojian Zhuang MAX8925_LDO(10, 750, 3900, 50), 20508ff6f2aSHaojian Zhuang MAX8925_LDO(11, 750, 3900, 50), 20608ff6f2aSHaojian Zhuang MAX8925_LDO(12, 750, 3900, 50), 20708ff6f2aSHaojian Zhuang MAX8925_LDO(13, 750, 3900, 50), 20808ff6f2aSHaojian Zhuang MAX8925_LDO(14, 750, 3900, 50), 20908ff6f2aSHaojian Zhuang MAX8925_LDO(15, 750, 3900, 50), 21008ff6f2aSHaojian Zhuang MAX8925_LDO(16, 750, 3900, 50), 21108ff6f2aSHaojian Zhuang MAX8925_LDO(17, 650, 2250, 25), 21208ff6f2aSHaojian Zhuang MAX8925_LDO(18, 650, 2250, 25), 21308ff6f2aSHaojian Zhuang MAX8925_LDO(19, 750, 3900, 50), 21408ff6f2aSHaojian Zhuang MAX8925_LDO(20, 750, 3900, 50), 21508ff6f2aSHaojian Zhuang }; 21608ff6f2aSHaojian Zhuang 21708ff6f2aSHaojian Zhuang static int __devinit max8925_regulator_probe(struct platform_device *pdev) 21808ff6f2aSHaojian Zhuang { 21908ff6f2aSHaojian Zhuang struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 220*51acdb61SHaojian Zhuang struct regulator_init_data *pdata = pdev->dev.platform_data; 221c172708dSMark Brown struct regulator_config config = { }; 2223fff6c04SDmitry Torokhov struct max8925_regulator_info *ri; 223*51acdb61SHaojian Zhuang struct resource *res; 22408ff6f2aSHaojian Zhuang struct regulator_dev *rdev; 225*51acdb61SHaojian Zhuang int i; 22608ff6f2aSHaojian Zhuang 227*51acdb61SHaojian Zhuang res = platform_get_resource(pdev, IORESOURCE_REG, 0); 228*51acdb61SHaojian Zhuang if (!res) { 229*51acdb61SHaojian Zhuang dev_err(&pdev->dev, "No REG resource!\n"); 230*51acdb61SHaojian Zhuang return -EINVAL; 231*51acdb61SHaojian Zhuang } 232*51acdb61SHaojian Zhuang for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { 233*51acdb61SHaojian Zhuang ri = &max8925_regulator_info[i]; 234*51acdb61SHaojian Zhuang if (ri->vol_reg == res->start) 235*51acdb61SHaojian Zhuang break; 236*51acdb61SHaojian Zhuang } 237*51acdb61SHaojian Zhuang if (i == ARRAY_SIZE(max8925_regulator_info)) { 238*51acdb61SHaojian Zhuang dev_err(&pdev->dev, "Failed to find regulator %llu\n", 239*51acdb61SHaojian Zhuang (unsigned long long)res->start); 24008ff6f2aSHaojian Zhuang return -EINVAL; 24108ff6f2aSHaojian Zhuang } 24208ff6f2aSHaojian Zhuang ri->i2c = chip->i2c; 24308ff6f2aSHaojian Zhuang ri->chip = chip; 24408ff6f2aSHaojian Zhuang 245c172708dSMark Brown config.dev = &pdev->dev; 246*51acdb61SHaojian Zhuang config.init_data = pdata; 247c172708dSMark Brown config.driver_data = ri; 248c172708dSMark Brown 249c172708dSMark Brown rdev = regulator_register(&ri->desc, &config); 25008ff6f2aSHaojian Zhuang if (IS_ERR(rdev)) { 25108ff6f2aSHaojian Zhuang dev_err(&pdev->dev, "failed to register regulator %s\n", 25208ff6f2aSHaojian Zhuang ri->desc.name); 25308ff6f2aSHaojian Zhuang return PTR_ERR(rdev); 25408ff6f2aSHaojian Zhuang } 25508ff6f2aSHaojian Zhuang 25608ff6f2aSHaojian Zhuang platform_set_drvdata(pdev, rdev); 25708ff6f2aSHaojian Zhuang return 0; 25808ff6f2aSHaojian Zhuang } 25908ff6f2aSHaojian Zhuang 26008ff6f2aSHaojian Zhuang static int __devexit max8925_regulator_remove(struct platform_device *pdev) 26108ff6f2aSHaojian Zhuang { 26208ff6f2aSHaojian Zhuang struct regulator_dev *rdev = platform_get_drvdata(pdev); 26308ff6f2aSHaojian Zhuang 2643fff6c04SDmitry Torokhov platform_set_drvdata(pdev, NULL); 26508ff6f2aSHaojian Zhuang regulator_unregister(rdev); 2663fff6c04SDmitry Torokhov 26708ff6f2aSHaojian Zhuang return 0; 26808ff6f2aSHaojian Zhuang } 26908ff6f2aSHaojian Zhuang 27008ff6f2aSHaojian Zhuang static struct platform_driver max8925_regulator_driver = { 27108ff6f2aSHaojian Zhuang .driver = { 27208ff6f2aSHaojian Zhuang .name = "max8925-regulator", 27308ff6f2aSHaojian Zhuang .owner = THIS_MODULE, 27408ff6f2aSHaojian Zhuang }, 27508ff6f2aSHaojian Zhuang .probe = max8925_regulator_probe, 27608ff6f2aSHaojian Zhuang .remove = __devexit_p(max8925_regulator_remove), 27708ff6f2aSHaojian Zhuang }; 27808ff6f2aSHaojian Zhuang 27908ff6f2aSHaojian Zhuang static int __init max8925_regulator_init(void) 28008ff6f2aSHaojian Zhuang { 28108ff6f2aSHaojian Zhuang return platform_driver_register(&max8925_regulator_driver); 28208ff6f2aSHaojian Zhuang } 28308ff6f2aSHaojian Zhuang subsys_initcall(max8925_regulator_init); 28408ff6f2aSHaojian Zhuang 28508ff6f2aSHaojian Zhuang static void __exit max8925_regulator_exit(void) 28608ff6f2aSHaojian Zhuang { 28708ff6f2aSHaojian Zhuang platform_driver_unregister(&max8925_regulator_driver); 28808ff6f2aSHaojian Zhuang } 28908ff6f2aSHaojian Zhuang module_exit(max8925_regulator_exit); 29008ff6f2aSHaojian Zhuang 29108ff6f2aSHaojian Zhuang MODULE_LICENSE("GPL"); 29208ff6f2aSHaojian Zhuang MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 29308ff6f2aSHaojian Zhuang MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); 29408ff6f2aSHaojian Zhuang MODULE_ALIAS("platform:max8925-regulator"); 295