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 27db13c040SHaojian Zhuang /* bit definitions in SD & LDO control registers */ 28db13c040SHaojian Zhuang #define OUT_ENABLE 0x1f /* Power U/D sequence as I2C */ 29db13c040SHaojian Zhuang #define OUT_DISABLE 0x1e /* Power U/D sequence as I2C */ 30db13c040SHaojian Zhuang 3108ff6f2aSHaojian Zhuang struct max8925_regulator_info { 3208ff6f2aSHaojian Zhuang struct regulator_desc desc; 3308ff6f2aSHaojian Zhuang struct regulator_dev *regulator; 3408ff6f2aSHaojian Zhuang struct i2c_client *i2c; 3508ff6f2aSHaojian Zhuang struct max8925_chip *chip; 3608ff6f2aSHaojian Zhuang 3708ff6f2aSHaojian Zhuang int min_uV; 3808ff6f2aSHaojian Zhuang int max_uV; 3908ff6f2aSHaojian Zhuang int step_uV; 4008ff6f2aSHaojian Zhuang int vol_reg; 4108ff6f2aSHaojian Zhuang int vol_shift; 4208ff6f2aSHaojian Zhuang int vol_nbits; 4308ff6f2aSHaojian Zhuang int enable_bit; 4408ff6f2aSHaojian Zhuang int enable_reg; 4508ff6f2aSHaojian Zhuang }; 4608ff6f2aSHaojian Zhuang 4708ff6f2aSHaojian Zhuang static inline int check_range(struct max8925_regulator_info *info, 4808ff6f2aSHaojian Zhuang int min_uV, int max_uV) 4908ff6f2aSHaojian Zhuang { 5008ff6f2aSHaojian Zhuang if (min_uV < info->min_uV || min_uV > info->max_uV) 5108ff6f2aSHaojian Zhuang return -EINVAL; 5208ff6f2aSHaojian Zhuang 5308ff6f2aSHaojian Zhuang return 0; 5408ff6f2aSHaojian Zhuang } 5508ff6f2aSHaojian Zhuang 5608ff6f2aSHaojian Zhuang static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index) 5708ff6f2aSHaojian Zhuang { 5808ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 5908ff6f2aSHaojian Zhuang return info->min_uV + index * info->step_uV; 6008ff6f2aSHaojian Zhuang } 6108ff6f2aSHaojian Zhuang 6208ff6f2aSHaojian Zhuang static int max8925_set_voltage(struct regulator_dev *rdev, 633a93f2a9SMark Brown int min_uV, int max_uV, unsigned int *selector) 6408ff6f2aSHaojian Zhuang { 6508ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 6608ff6f2aSHaojian Zhuang unsigned char data, mask; 6708ff6f2aSHaojian Zhuang 6808ff6f2aSHaojian Zhuang if (check_range(info, min_uV, max_uV)) { 6908ff6f2aSHaojian Zhuang dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n", 7008ff6f2aSHaojian Zhuang min_uV, max_uV); 7108ff6f2aSHaojian Zhuang return -EINVAL; 7208ff6f2aSHaojian Zhuang } 7308ff6f2aSHaojian Zhuang data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV; 743a93f2a9SMark Brown *selector = data; 7508ff6f2aSHaojian Zhuang data <<= info->vol_shift; 7608ff6f2aSHaojian Zhuang mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; 7708ff6f2aSHaojian Zhuang 7808ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->vol_reg, mask, data); 7908ff6f2aSHaojian Zhuang } 8008ff6f2aSHaojian Zhuang 8108ff6f2aSHaojian Zhuang static int max8925_get_voltage(struct regulator_dev *rdev) 8208ff6f2aSHaojian Zhuang { 8308ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 8408ff6f2aSHaojian Zhuang unsigned char data, mask; 8508ff6f2aSHaojian Zhuang int ret; 8608ff6f2aSHaojian Zhuang 8708ff6f2aSHaojian Zhuang ret = max8925_reg_read(info->i2c, info->vol_reg); 8808ff6f2aSHaojian Zhuang if (ret < 0) 8908ff6f2aSHaojian Zhuang return ret; 9008ff6f2aSHaojian Zhuang mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; 9108ff6f2aSHaojian Zhuang data = (ret & mask) >> info->vol_shift; 9208ff6f2aSHaojian Zhuang 9308ff6f2aSHaojian Zhuang return max8925_list_voltage(rdev, data); 9408ff6f2aSHaojian Zhuang } 9508ff6f2aSHaojian Zhuang 9608ff6f2aSHaojian Zhuang static int max8925_enable(struct regulator_dev *rdev) 9708ff6f2aSHaojian Zhuang { 9808ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 9908ff6f2aSHaojian Zhuang 10008ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, 101db13c040SHaojian Zhuang OUT_ENABLE << info->enable_bit, 102db13c040SHaojian Zhuang OUT_ENABLE << info->enable_bit); 10308ff6f2aSHaojian Zhuang } 10408ff6f2aSHaojian Zhuang 10508ff6f2aSHaojian Zhuang static int max8925_disable(struct regulator_dev *rdev) 10608ff6f2aSHaojian Zhuang { 10708ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 10808ff6f2aSHaojian Zhuang 10908ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, 110db13c040SHaojian Zhuang OUT_ENABLE << info->enable_bit, 111db13c040SHaojian Zhuang OUT_DISABLE << info->enable_bit); 11208ff6f2aSHaojian Zhuang } 11308ff6f2aSHaojian Zhuang 11408ff6f2aSHaojian Zhuang static int max8925_is_enabled(struct regulator_dev *rdev) 11508ff6f2aSHaojian Zhuang { 11608ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 11708ff6f2aSHaojian Zhuang int ret; 11808ff6f2aSHaojian Zhuang 1194b99fef0SHaojian Zhuang ret = max8925_reg_read(info->i2c, info->enable_reg); 12008ff6f2aSHaojian Zhuang if (ret < 0) 12108ff6f2aSHaojian Zhuang return ret; 12208ff6f2aSHaojian Zhuang 12308ff6f2aSHaojian Zhuang return ret & (1 << info->enable_bit); 12408ff6f2aSHaojian Zhuang } 12508ff6f2aSHaojian Zhuang 12608ff6f2aSHaojian Zhuang static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) 12708ff6f2aSHaojian Zhuang { 12808ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 12908ff6f2aSHaojian Zhuang unsigned char data, mask; 13008ff6f2aSHaojian Zhuang 13108ff6f2aSHaojian Zhuang if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) 13208ff6f2aSHaojian Zhuang return -EINVAL; 13308ff6f2aSHaojian Zhuang 13408ff6f2aSHaojian Zhuang data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP; 13508ff6f2aSHaojian Zhuang data <<= SD1_DVM_SHIFT; 13608ff6f2aSHaojian Zhuang mask = 3 << SD1_DVM_SHIFT; 13708ff6f2aSHaojian Zhuang 13808ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->enable_reg, mask, data); 13908ff6f2aSHaojian Zhuang } 14008ff6f2aSHaojian Zhuang 14108ff6f2aSHaojian Zhuang static int max8925_set_dvm_enable(struct regulator_dev *rdev) 14208ff6f2aSHaojian Zhuang { 14308ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 14408ff6f2aSHaojian Zhuang 14508ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 14608ff6f2aSHaojian Zhuang 1 << SD1_DVM_EN); 14708ff6f2aSHaojian Zhuang } 14808ff6f2aSHaojian Zhuang 14908ff6f2aSHaojian Zhuang static int max8925_set_dvm_disable(struct regulator_dev *rdev) 15008ff6f2aSHaojian Zhuang { 15108ff6f2aSHaojian Zhuang struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 15208ff6f2aSHaojian Zhuang 15308ff6f2aSHaojian Zhuang return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); 15408ff6f2aSHaojian Zhuang } 15508ff6f2aSHaojian Zhuang 15608ff6f2aSHaojian Zhuang static struct regulator_ops max8925_regulator_sdv_ops = { 15708ff6f2aSHaojian Zhuang .set_voltage = max8925_set_voltage, 15808ff6f2aSHaojian Zhuang .get_voltage = max8925_get_voltage, 15908ff6f2aSHaojian Zhuang .enable = max8925_enable, 16008ff6f2aSHaojian Zhuang .disable = max8925_disable, 16108ff6f2aSHaojian Zhuang .is_enabled = max8925_is_enabled, 16208ff6f2aSHaojian Zhuang .set_suspend_voltage = max8925_set_dvm_voltage, 16308ff6f2aSHaojian Zhuang .set_suspend_enable = max8925_set_dvm_enable, 16408ff6f2aSHaojian Zhuang .set_suspend_disable = max8925_set_dvm_disable, 16508ff6f2aSHaojian Zhuang }; 16608ff6f2aSHaojian Zhuang 16708ff6f2aSHaojian Zhuang static struct regulator_ops max8925_regulator_ldo_ops = { 16808ff6f2aSHaojian Zhuang .set_voltage = max8925_set_voltage, 16908ff6f2aSHaojian Zhuang .get_voltage = max8925_get_voltage, 17008ff6f2aSHaojian Zhuang .enable = max8925_enable, 17108ff6f2aSHaojian Zhuang .disable = max8925_disable, 17208ff6f2aSHaojian Zhuang .is_enabled = max8925_is_enabled, 17308ff6f2aSHaojian Zhuang }; 17408ff6f2aSHaojian Zhuang 17508ff6f2aSHaojian Zhuang #define MAX8925_SDV(_id, min, max, step) \ 17608ff6f2aSHaojian Zhuang { \ 17708ff6f2aSHaojian Zhuang .desc = { \ 17808ff6f2aSHaojian Zhuang .name = "SDV" #_id, \ 17908ff6f2aSHaojian Zhuang .ops = &max8925_regulator_sdv_ops, \ 18008ff6f2aSHaojian Zhuang .type = REGULATOR_VOLTAGE, \ 18108ff6f2aSHaojian Zhuang .id = MAX8925_ID_SD##_id, \ 18208ff6f2aSHaojian Zhuang .owner = THIS_MODULE, \ 18308ff6f2aSHaojian Zhuang }, \ 18408ff6f2aSHaojian Zhuang .min_uV = min * 1000, \ 18508ff6f2aSHaojian Zhuang .max_uV = max * 1000, \ 18608ff6f2aSHaojian Zhuang .step_uV = step * 1000, \ 18708ff6f2aSHaojian Zhuang .vol_reg = MAX8925_SDV##_id, \ 18808ff6f2aSHaojian Zhuang .vol_shift = 0, \ 18908ff6f2aSHaojian Zhuang .vol_nbits = 6, \ 19008ff6f2aSHaojian Zhuang .enable_reg = MAX8925_SDCTL##_id, \ 19108ff6f2aSHaojian Zhuang .enable_bit = 0, \ 19208ff6f2aSHaojian Zhuang } 19308ff6f2aSHaojian Zhuang 19408ff6f2aSHaojian Zhuang #define MAX8925_LDO(_id, min, max, step) \ 19508ff6f2aSHaojian Zhuang { \ 19608ff6f2aSHaojian Zhuang .desc = { \ 19708ff6f2aSHaojian Zhuang .name = "LDO" #_id, \ 19808ff6f2aSHaojian Zhuang .ops = &max8925_regulator_ldo_ops, \ 19908ff6f2aSHaojian Zhuang .type = REGULATOR_VOLTAGE, \ 20008ff6f2aSHaojian Zhuang .id = MAX8925_ID_LDO##_id, \ 20108ff6f2aSHaojian Zhuang .owner = THIS_MODULE, \ 20208ff6f2aSHaojian Zhuang }, \ 20308ff6f2aSHaojian Zhuang .min_uV = min * 1000, \ 20408ff6f2aSHaojian Zhuang .max_uV = max * 1000, \ 20508ff6f2aSHaojian Zhuang .step_uV = step * 1000, \ 20608ff6f2aSHaojian Zhuang .vol_reg = MAX8925_LDOVOUT##_id, \ 20708ff6f2aSHaojian Zhuang .vol_shift = 0, \ 20808ff6f2aSHaojian Zhuang .vol_nbits = 6, \ 20908ff6f2aSHaojian Zhuang .enable_reg = MAX8925_LDOCTL##_id, \ 21008ff6f2aSHaojian Zhuang .enable_bit = 0, \ 21108ff6f2aSHaojian Zhuang } 21208ff6f2aSHaojian Zhuang 21308ff6f2aSHaojian Zhuang static struct max8925_regulator_info max8925_regulator_info[] = { 21408ff6f2aSHaojian Zhuang MAX8925_SDV(1, 637.5, 1425, 12.5), 21508ff6f2aSHaojian Zhuang MAX8925_SDV(2, 650, 2225, 25), 21608ff6f2aSHaojian Zhuang MAX8925_SDV(3, 750, 3900, 50), 21708ff6f2aSHaojian Zhuang 21808ff6f2aSHaojian Zhuang MAX8925_LDO(1, 750, 3900, 50), 21908ff6f2aSHaojian Zhuang MAX8925_LDO(2, 650, 2250, 25), 22008ff6f2aSHaojian Zhuang MAX8925_LDO(3, 650, 2250, 25), 22108ff6f2aSHaojian Zhuang MAX8925_LDO(4, 750, 3900, 50), 22208ff6f2aSHaojian Zhuang MAX8925_LDO(5, 750, 3900, 50), 22308ff6f2aSHaojian Zhuang MAX8925_LDO(6, 750, 3900, 50), 22408ff6f2aSHaojian Zhuang MAX8925_LDO(7, 750, 3900, 50), 22508ff6f2aSHaojian Zhuang MAX8925_LDO(8, 750, 3900, 50), 22608ff6f2aSHaojian Zhuang MAX8925_LDO(9, 750, 3900, 50), 22708ff6f2aSHaojian Zhuang MAX8925_LDO(10, 750, 3900, 50), 22808ff6f2aSHaojian Zhuang MAX8925_LDO(11, 750, 3900, 50), 22908ff6f2aSHaojian Zhuang MAX8925_LDO(12, 750, 3900, 50), 23008ff6f2aSHaojian Zhuang MAX8925_LDO(13, 750, 3900, 50), 23108ff6f2aSHaojian Zhuang MAX8925_LDO(14, 750, 3900, 50), 23208ff6f2aSHaojian Zhuang MAX8925_LDO(15, 750, 3900, 50), 23308ff6f2aSHaojian Zhuang MAX8925_LDO(16, 750, 3900, 50), 23408ff6f2aSHaojian Zhuang MAX8925_LDO(17, 650, 2250, 25), 23508ff6f2aSHaojian Zhuang MAX8925_LDO(18, 650, 2250, 25), 23608ff6f2aSHaojian Zhuang MAX8925_LDO(19, 750, 3900, 50), 23708ff6f2aSHaojian Zhuang MAX8925_LDO(20, 750, 3900, 50), 23808ff6f2aSHaojian Zhuang }; 23908ff6f2aSHaojian Zhuang 2403fff6c04SDmitry Torokhov static struct max8925_regulator_info * __devinit find_regulator_info(int id) 24108ff6f2aSHaojian Zhuang { 24208ff6f2aSHaojian Zhuang struct max8925_regulator_info *ri; 24308ff6f2aSHaojian Zhuang int i; 24408ff6f2aSHaojian Zhuang 24508ff6f2aSHaojian Zhuang for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { 24608ff6f2aSHaojian Zhuang ri = &max8925_regulator_info[i]; 24708ff6f2aSHaojian Zhuang if (ri->desc.id == id) 24808ff6f2aSHaojian Zhuang return ri; 24908ff6f2aSHaojian Zhuang } 25008ff6f2aSHaojian Zhuang return NULL; 25108ff6f2aSHaojian Zhuang } 25208ff6f2aSHaojian Zhuang 25308ff6f2aSHaojian Zhuang static int __devinit max8925_regulator_probe(struct platform_device *pdev) 25408ff6f2aSHaojian Zhuang { 25508ff6f2aSHaojian Zhuang struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 25608ff6f2aSHaojian Zhuang struct max8925_platform_data *pdata = chip->dev->platform_data; 2573fff6c04SDmitry Torokhov struct max8925_regulator_info *ri; 25808ff6f2aSHaojian Zhuang struct regulator_dev *rdev; 25908ff6f2aSHaojian Zhuang 26008ff6f2aSHaojian Zhuang ri = find_regulator_info(pdev->id); 26108ff6f2aSHaojian Zhuang if (ri == NULL) { 26208ff6f2aSHaojian Zhuang dev_err(&pdev->dev, "invalid regulator ID specified\n"); 26308ff6f2aSHaojian Zhuang return -EINVAL; 26408ff6f2aSHaojian Zhuang } 26508ff6f2aSHaojian Zhuang ri->i2c = chip->i2c; 26608ff6f2aSHaojian Zhuang ri->chip = chip; 26708ff6f2aSHaojian Zhuang 26808ff6f2aSHaojian Zhuang rdev = regulator_register(&ri->desc, &pdev->dev, 269*2c043bcbSRajendra Nayak pdata->regulator[pdev->id], ri, NULL); 27008ff6f2aSHaojian Zhuang if (IS_ERR(rdev)) { 27108ff6f2aSHaojian Zhuang dev_err(&pdev->dev, "failed to register regulator %s\n", 27208ff6f2aSHaojian Zhuang ri->desc.name); 27308ff6f2aSHaojian Zhuang return PTR_ERR(rdev); 27408ff6f2aSHaojian Zhuang } 27508ff6f2aSHaojian Zhuang 27608ff6f2aSHaojian Zhuang platform_set_drvdata(pdev, rdev); 27708ff6f2aSHaojian Zhuang return 0; 27808ff6f2aSHaojian Zhuang } 27908ff6f2aSHaojian Zhuang 28008ff6f2aSHaojian Zhuang static int __devexit max8925_regulator_remove(struct platform_device *pdev) 28108ff6f2aSHaojian Zhuang { 28208ff6f2aSHaojian Zhuang struct regulator_dev *rdev = platform_get_drvdata(pdev); 28308ff6f2aSHaojian Zhuang 2843fff6c04SDmitry Torokhov platform_set_drvdata(pdev, NULL); 28508ff6f2aSHaojian Zhuang regulator_unregister(rdev); 2863fff6c04SDmitry Torokhov 28708ff6f2aSHaojian Zhuang return 0; 28808ff6f2aSHaojian Zhuang } 28908ff6f2aSHaojian Zhuang 29008ff6f2aSHaojian Zhuang static struct platform_driver max8925_regulator_driver = { 29108ff6f2aSHaojian Zhuang .driver = { 29208ff6f2aSHaojian Zhuang .name = "max8925-regulator", 29308ff6f2aSHaojian Zhuang .owner = THIS_MODULE, 29408ff6f2aSHaojian Zhuang }, 29508ff6f2aSHaojian Zhuang .probe = max8925_regulator_probe, 29608ff6f2aSHaojian Zhuang .remove = __devexit_p(max8925_regulator_remove), 29708ff6f2aSHaojian Zhuang }; 29808ff6f2aSHaojian Zhuang 29908ff6f2aSHaojian Zhuang static int __init max8925_regulator_init(void) 30008ff6f2aSHaojian Zhuang { 30108ff6f2aSHaojian Zhuang return platform_driver_register(&max8925_regulator_driver); 30208ff6f2aSHaojian Zhuang } 30308ff6f2aSHaojian Zhuang subsys_initcall(max8925_regulator_init); 30408ff6f2aSHaojian Zhuang 30508ff6f2aSHaojian Zhuang static void __exit max8925_regulator_exit(void) 30608ff6f2aSHaojian Zhuang { 30708ff6f2aSHaojian Zhuang platform_driver_unregister(&max8925_regulator_driver); 30808ff6f2aSHaojian Zhuang } 30908ff6f2aSHaojian Zhuang module_exit(max8925_regulator_exit); 31008ff6f2aSHaojian Zhuang 31108ff6f2aSHaojian Zhuang MODULE_LICENSE("GPL"); 31208ff6f2aSHaojian Zhuang MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 31308ff6f2aSHaojian Zhuang MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); 31408ff6f2aSHaojian Zhuang MODULE_ALIAS("platform:max8925-regulator"); 31508ff6f2aSHaojian Zhuang 316