/* * 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 #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 */ /* bit definitions in LDO control registers */ #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ #define LDO_I2C_EN 0x1 /* Enable by i2c */ #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ struct max8925_regulator_info { struct regulator_desc desc; struct i2c_client *i2c; int vol_reg; int enable_reg; }; static int max8925_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); unsigned char mask = rdev->desc->n_voltages - 1; return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); } static int max8925_get_voltage_sel(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 = rdev->desc->n_voltages - 1; data = ret & mask; return 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, LDO_SEQ_MASK << LDO_SEQ_SHIFT | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, LDO_SEQ_I2C << LDO_SEQ_SHIFT | LDO_I2C_EN << LDO_I2C_EN_SHIFT); } 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, LDO_SEQ_MASK << LDO_SEQ_SHIFT | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, LDO_SEQ_I2C << LDO_SEQ_SHIFT); } static int max8925_is_enabled(struct regulator_dev *rdev) { struct max8925_regulator_info *info = rdev_get_drvdata(rdev); int ldo_seq, ret; ret = max8925_reg_read(info->i2c, info->enable_reg); if (ret < 0) return ret; ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; if (ldo_seq != LDO_SEQ_I2C) return 1; else return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); } 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 = DIV_ROUND_UP(uV - SD1_DVM_VMIN, 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 const struct regulator_ops max8925_regulator_sdv_ops = { .map_voltage = regulator_map_voltage_linear, .list_voltage = regulator_list_voltage_linear, .set_voltage_sel = max8925_set_voltage_sel, .get_voltage_sel = max8925_get_voltage_sel, .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 const struct regulator_ops max8925_regulator_ldo_ops = { .map_voltage = regulator_map_voltage_linear, .list_voltage = regulator_list_voltage_linear, .set_voltage_sel = max8925_set_voltage_sel, .get_voltage_sel = max8925_get_voltage_sel, .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, \ .n_voltages = 64, \ .min_uV = min * 1000, \ .uV_step = step * 1000, \ }, \ .vol_reg = MAX8925_SDV##_id, \ .enable_reg = MAX8925_SDCTL##_id, \ } #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, \ .n_voltages = 64, \ .min_uV = min * 1000, \ .uV_step = step * 1000, \ }, \ .vol_reg = MAX8925_LDOVOUT##_id, \ .enable_reg = MAX8925_LDOCTL##_id, \ } #ifdef CONFIG_OF static struct of_regulator_match max8925_regulator_matches[] = { { .name = "SDV1",}, { .name = "SDV2",}, { .name = "SDV3",}, { .name = "LDO1",}, { .name = "LDO2",}, { .name = "LDO3",}, { .name = "LDO4",}, { .name = "LDO5",}, { .name = "LDO6",}, { .name = "LDO7",}, { .name = "LDO8",}, { .name = "LDO9",}, { .name = "LDO10",}, { .name = "LDO11",}, { .name = "LDO12",}, { .name = "LDO13",}, { .name = "LDO14",}, { .name = "LDO15",}, { .name = "LDO16",}, { .name = "LDO17",}, { .name = "LDO18",}, { .name = "LDO19",}, { .name = "LDO20",}, }; #endif 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), }; #ifdef CONFIG_OF static int max8925_regulator_dt_init(struct platform_device *pdev, struct regulator_config *config, int ridx) { struct device_node *nproot, *np; int rcount; nproot = pdev->dev.parent->of_node; if (!nproot) return -ENODEV; np = of_get_child_by_name(nproot, "regulators"); if (!np) { dev_err(&pdev->dev, "failed to find regulators node\n"); return -ENODEV; } rcount = of_regulator_match(&pdev->dev, np, &max8925_regulator_matches[ridx], 1); of_node_put(np); if (rcount < 0) return rcount; config->init_data = max8925_regulator_matches[ridx].init_data; config->of_node = max8925_regulator_matches[ridx].of_node; return 0; } #else #define max8925_regulator_dt_init(x, y, z) (-1) #endif static int max8925_regulator_probe(struct platform_device *pdev) { struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev); struct regulator_config config = { }; struct max8925_regulator_info *ri; struct resource *res; struct regulator_dev *rdev; int i, regulator_idx; res = platform_get_resource(pdev, IORESOURCE_REG, 0); if (!res) { dev_err(&pdev->dev, "No REG resource!\n"); return -EINVAL; } for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { ri = &max8925_regulator_info[i]; if (ri->vol_reg == res->start) { regulator_idx = i; break; } } if (i == ARRAY_SIZE(max8925_regulator_info)) { dev_err(&pdev->dev, "Failed to find regulator %llu\n", (unsigned long long)res->start); return -EINVAL; } ri->i2c = chip->i2c; config.dev = &pdev->dev; config.driver_data = ri; if (max8925_regulator_dt_init(pdev, &config, regulator_idx)) if (pdata) config.init_data = pdata; rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); 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 struct platform_driver max8925_regulator_driver = { .driver = { .name = "max8925-regulator", }, .probe = max8925_regulator_probe, }; 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");