/* * Regulators driver for Maxim max8925 * * Copyright (C) 2009 Marvell International Ltd. * Haojian Zhuang * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #define SD1_DVM_VMIN 850000 #define SD1_DVM_VMAX 1000000 #define SD1_DVM_STEP 50000 #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ #define SD1_DVM_EN 6 /* SDV1 bit 6 */ struct max8925_regulator_info { struct regulator_desc desc; struct regulator_dev *regulator; struct i2c_client *i2c; struct max8925_chip *chip; int min_uV; int max_uV; int step_uV; int vol_reg; int vol_shift; int vol_nbits; int enable_bit; int enable_reg; }; static inline int check_range(struct max8925_regulator_info *info, int min_uV, int max_uV) { if (min_uV < info->min_uV || min_uV > info->max_uV) return -EINVAL; return 0; } static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); return info->min_uV + index * info->step_uV; } static int max8925_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); unsigned char data, mask; if (check_range(info, min_uV, max_uV)) { dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n", min_uV, max_uV); return -EINVAL; } data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV; data <<= info->vol_shift; mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; return max8925_set_bits(info->i2c, info->vol_reg, mask, data); } static int max8925_get_voltage(struct regulator_dev *rdev) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); unsigned char data, mask; int ret; ret = max8925_reg_read(info->i2c, info->vol_reg); if (ret < 0) return ret; mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; data = (ret & mask) >> info->vol_shift; return max8925_list_voltage(rdev, data); } static int max8925_enable(struct regulator_dev *rdev) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); return max8925_set_bits(info->i2c, info->enable_reg, 1 << info->enable_bit, 1 << info->enable_bit); } static int max8925_disable(struct regulator_dev *rdev) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); return max8925_set_bits(info->i2c, info->enable_reg, 1 << info->enable_bit, 0); } static int max8925_is_enabled(struct regulator_dev *rdev) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); int ret; ret = max8925_reg_read(info->i2c, info->enable_reg); if (ret < 0) return ret; return ret & (1 << info->enable_bit); } static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); unsigned char data, mask; if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) return -EINVAL; data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP; data <<= SD1_DVM_SHIFT; mask = 3 << SD1_DVM_SHIFT; return max8925_set_bits(info->i2c, info->enable_reg, mask, data); } static int max8925_set_dvm_enable(struct regulator_dev *rdev) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 1 << SD1_DVM_EN); } static int max8925_set_dvm_disable(struct regulator_dev *rdev) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); } static struct regulator_ops max8925_regulator_sdv_ops = { .set_voltage = max8925_set_voltage, .get_voltage = max8925_get_voltage, .enable = max8925_enable, .disable = max8925_disable, .is_enabled = max8925_is_enabled, .set_suspend_voltage = max8925_set_dvm_voltage, .set_suspend_enable = max8925_set_dvm_enable, .set_suspend_disable = max8925_set_dvm_disable, }; static struct regulator_ops max8925_regulator_ldo_ops = { .set_voltage = max8925_set_voltage, .get_voltage = max8925_get_voltage, .enable = max8925_enable, .disable = max8925_disable, .is_enabled = max8925_is_enabled, }; #define MAX8925_SDV(_id, min, max, step) \ { \ .desc = { \ .name = "SDV" #_id, \ .ops = &max8925_regulator_sdv_ops, \ .type = REGULATOR_VOLTAGE, \ .id = MAX8925_ID_SD##_id, \ .owner = THIS_MODULE, \ }, \ .min_uV = min * 1000, \ .max_uV = max * 1000, \ .step_uV = step * 1000, \ .vol_reg = MAX8925_SDV##_id, \ .vol_shift = 0, \ .vol_nbits = 6, \ .enable_reg = MAX8925_SDCTL##_id, \ .enable_bit = 0, \ } #define MAX8925_LDO(_id, min, max, step) \ { \ .desc = { \ .name = "LDO" #_id, \ .ops = &max8925_regulator_ldo_ops, \ .type = REGULATOR_VOLTAGE, \ .id = MAX8925_ID_LDO##_id, \ .owner = THIS_MODULE, \ }, \ .min_uV = min * 1000, \ .max_uV = max * 1000, \ .step_uV = step * 1000, \ .vol_reg = MAX8925_LDOVOUT##_id, \ .vol_shift = 0, \ .vol_nbits = 6, \ .enable_reg = MAX8925_LDOCTL##_id, \ .enable_bit = 0, \ } static struct max8925_regulator_info max8925_regulator_info[] = { MAX8925_SDV(1, 637.5, 1425, 12.5), MAX8925_SDV(2, 650, 2225, 25), MAX8925_SDV(3, 750, 3900, 50), MAX8925_LDO(1, 750, 3900, 50), MAX8925_LDO(2, 650, 2250, 25), MAX8925_LDO(3, 650, 2250, 25), MAX8925_LDO(4, 750, 3900, 50), MAX8925_LDO(5, 750, 3900, 50), MAX8925_LDO(6, 750, 3900, 50), MAX8925_LDO(7, 750, 3900, 50), MAX8925_LDO(8, 750, 3900, 50), MAX8925_LDO(9, 750, 3900, 50), MAX8925_LDO(10, 750, 3900, 50), MAX8925_LDO(11, 750, 3900, 50), MAX8925_LDO(12, 750, 3900, 50), MAX8925_LDO(13, 750, 3900, 50), MAX8925_LDO(14, 750, 3900, 50), MAX8925_LDO(15, 750, 3900, 50), MAX8925_LDO(16, 750, 3900, 50), MAX8925_LDO(17, 650, 2250, 25), MAX8925_LDO(18, 650, 2250, 25), MAX8925_LDO(19, 750, 3900, 50), MAX8925_LDO(20, 750, 3900, 50), }; static struct max8925_regulator_info * __devinit find_regulator_info(int id) { struct max8925_regulator_info *ri; int i; for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { ri = &max8925_regulator_info[i]; if (ri->desc.id == id) return ri; } return NULL; } static int __devinit max8925_regulator_probe(struct platform_device *pdev) { struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); struct max8925_platform_data *pdata = chip->dev->platform_data; struct max8925_regulator_info *ri; struct regulator_dev *rdev; ri = find_regulator_info(pdev->id); if (ri == NULL) { dev_err(&pdev->dev, "invalid regulator ID specified\n"); return -EINVAL; } ri->i2c = chip->i2c; ri->chip = chip; rdev = regulator_register(&ri->desc, &pdev->dev, pdata->regulator[pdev->id], ri); if (IS_ERR(rdev)) { dev_err(&pdev->dev, "failed to register regulator %s\n", ri->desc.name); return PTR_ERR(rdev); } platform_set_drvdata(pdev, rdev); return 0; } static int __devexit max8925_regulator_remove(struct platform_device *pdev) { struct regulator_dev *rdev = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); regulator_unregister(rdev); return 0; } static struct platform_driver max8925_regulator_driver = { .driver = { .name = "max8925-regulator", .owner = THIS_MODULE, }, .probe = max8925_regulator_probe, .remove = __devexit_p(max8925_regulator_remove), }; static int __init max8925_regulator_init(void) { return platform_driver_register(&max8925_regulator_driver); } subsys_initcall(max8925_regulator_init); static void __exit max8925_regulator_exit(void) { platform_driver_unregister(&max8925_regulator_driver); } module_exit(max8925_regulator_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Haojian Zhuang "); MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); MODULE_ALIAS("platform:max8925-regulator");