/* * FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver. * * Supported Part Numbers: * FAN53555UC00X/01X/03X/04X/05X * * Copyright (c) 2012 Marvell Technology Ltd. * Yunfan Zhang * * This package 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 /* Voltage setting */ #define FAN53555_VSEL0 0x00 #define FAN53555_VSEL1 0x01 /* Control register */ #define FAN53555_CONTROL 0x02 /* IC Type */ #define FAN53555_ID1 0x03 /* IC mask version */ #define FAN53555_ID2 0x04 /* Monitor register */ #define FAN53555_MONITOR 0x05 /* VSEL bit definitions */ #define VSEL_BUCK_EN (1 << 7) #define VSEL_MODE (1 << 6) #define VSEL_NSEL_MASK 0x3F /* Chip ID and Verison */ #define DIE_ID 0x0F /* ID1 */ #define DIE_REV 0x0F /* ID2 */ /* Control bit definitions */ #define CTL_OUTPUT_DISCHG (1 << 7) #define CTL_SLEW_MASK (0x7 << 4) #define CTL_SLEW_SHIFT 4 #define CTL_RESET (1 << 2) #define FAN53555_NVOLTAGES 64 /* Numbers of voltages */ /* IC Type */ enum { FAN53555_CHIP_ID_00 = 0, FAN53555_CHIP_ID_01, FAN53555_CHIP_ID_02, FAN53555_CHIP_ID_03, FAN53555_CHIP_ID_04, FAN53555_CHIP_ID_05, }; struct fan53555_device_info { struct regmap *regmap; struct device *dev; struct regulator_desc desc; struct regulator_dev *rdev; struct regulator_init_data *regulator; /* IC Type and Rev */ int chip_id; int chip_rev; /* Voltage setting register */ unsigned int vol_reg; unsigned int sleep_reg; /* Voltage range and step(linear) */ unsigned int vsel_min; unsigned int vsel_step; /* Voltage slew rate limiting */ unsigned int slew_rate; /* Sleep voltage cache */ unsigned int sleep_vol_cache; }; static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV) { struct fan53555_device_info *di = rdev_get_drvdata(rdev); int ret; if (di->sleep_vol_cache == uV) return 0; ret = regulator_map_voltage_linear(rdev, uV, uV); if (ret < 0) return -EINVAL; ret = regmap_update_bits(di->regmap, di->sleep_reg, VSEL_NSEL_MASK, ret); if (ret < 0) return -EINVAL; /* Cache the sleep voltage setting. * Might not be the real voltage which is rounded */ di->sleep_vol_cache = uV; return 0; } static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode) { struct fan53555_device_info *di = rdev_get_drvdata(rdev); switch (mode) { case REGULATOR_MODE_FAST: regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, VSEL_MODE); break; case REGULATOR_MODE_NORMAL: regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0); break; default: return -EINVAL; } return 0; } static unsigned int fan53555_get_mode(struct regulator_dev *rdev) { struct fan53555_device_info *di = rdev_get_drvdata(rdev); unsigned int val; int ret = 0; ret = regmap_read(di->regmap, di->vol_reg, &val); if (ret < 0) return ret; if (val & VSEL_MODE) return REGULATOR_MODE_FAST; else return REGULATOR_MODE_NORMAL; } static struct regulator_ops fan53555_regulator_ops = { .set_voltage_sel = regulator_set_voltage_sel_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, .map_voltage = regulator_map_voltage_linear, .list_voltage = regulator_list_voltage_linear, .set_suspend_voltage = fan53555_set_suspend_voltage, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .set_mode = fan53555_set_mode, .get_mode = fan53555_get_mode, }; /* For 00,01,03,05 options: * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V. * For 04 option: * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V. * */ static int fan53555_device_setup(struct fan53555_device_info *di, struct fan53555_platform_data *pdata) { unsigned int reg, data, mask; /* Setup voltage control register */ switch (pdata->sleep_vsel_id) { case FAN53555_VSEL_ID_0: di->sleep_reg = FAN53555_VSEL0; di->vol_reg = FAN53555_VSEL1; break; case FAN53555_VSEL_ID_1: di->sleep_reg = FAN53555_VSEL1; di->vol_reg = FAN53555_VSEL0; break; default: dev_err(di->dev, "Invalid VSEL ID!\n"); return -EINVAL; } /* Init voltage range and step */ switch (di->chip_id) { case FAN53555_CHIP_ID_00: case FAN53555_CHIP_ID_01: case FAN53555_CHIP_ID_03: case FAN53555_CHIP_ID_05: di->vsel_min = 600000; di->vsel_step = 10000; break; case FAN53555_CHIP_ID_04: di->vsel_min = 603000; di->vsel_step = 12826; break; default: dev_err(di->dev, "Chip ID[%d]\n not supported!\n", di->chip_id); return -EINVAL; } /* Init slew rate */ if (pdata->slew_rate & 0x7) di->slew_rate = pdata->slew_rate; else di->slew_rate = FAN53555_SLEW_RATE_64MV; reg = FAN53555_CONTROL; data = di->slew_rate << CTL_SLEW_SHIFT; mask = CTL_SLEW_MASK; return regmap_update_bits(di->regmap, reg, mask, data); } static int fan53555_regulator_register(struct fan53555_device_info *di, struct regulator_config *config) { struct regulator_desc *rdesc = &di->desc; rdesc->name = "fan53555-reg"; rdesc->ops = &fan53555_regulator_ops; rdesc->type = REGULATOR_VOLTAGE; rdesc->n_voltages = FAN53555_NVOLTAGES; rdesc->enable_reg = di->vol_reg; rdesc->enable_mask = VSEL_BUCK_EN; rdesc->min_uV = di->vsel_min; rdesc->uV_step = di->vsel_step; rdesc->vsel_reg = di->vol_reg; rdesc->vsel_mask = VSEL_NSEL_MASK; rdesc->owner = THIS_MODULE; di->rdev = regulator_register(&di->desc, config); return PTR_ERR_OR_ZERO(di->rdev); } static struct regmap_config fan53555_regmap_config = { .reg_bits = 8, .val_bits = 8, }; static int fan53555_regulator_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct fan53555_device_info *di; struct fan53555_platform_data *pdata; struct regulator_config config = { }; unsigned int val; int ret; pdata = client->dev.platform_data; if (!pdata || !pdata->regulator) { dev_err(&client->dev, "Platform data not found!\n"); return -ENODEV; } di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info), GFP_KERNEL); if (!di) { dev_err(&client->dev, "Failed to allocate device info data!\n"); return -ENOMEM; } di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config); if (IS_ERR(di->regmap)) { dev_err(&client->dev, "Failed to allocate regmap!\n"); return PTR_ERR(di->regmap); } di->dev = &client->dev; di->regulator = pdata->regulator; i2c_set_clientdata(client, di); /* Get chip ID */ ret = regmap_read(di->regmap, FAN53555_ID1, &val); if (ret < 0) { dev_err(&client->dev, "Failed to get chip ID!\n"); return -ENODEV; } di->chip_id = val & DIE_ID; /* Get chip revision */ ret = regmap_read(di->regmap, FAN53555_ID2, &val); if (ret < 0) { dev_err(&client->dev, "Failed to get chip Rev!\n"); return -ENODEV; } di->chip_rev = val & DIE_REV; dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n", di->chip_id, di->chip_rev); /* Device init */ ret = fan53555_device_setup(di, pdata); if (ret < 0) { dev_err(&client->dev, "Failed to setup device!\n"); return ret; } /* Register regulator */ config.dev = di->dev; config.init_data = di->regulator; config.regmap = di->regmap; config.driver_data = di; ret = fan53555_regulator_register(di, &config); if (ret < 0) dev_err(&client->dev, "Failed to register regulator!\n"); return ret; } static int fan53555_regulator_remove(struct i2c_client *client) { struct fan53555_device_info *di = i2c_get_clientdata(client); regulator_unregister(di->rdev); return 0; } static const struct i2c_device_id fan53555_id[] = { {"fan53555", -1}, { }, }; static struct i2c_driver fan53555_regulator_driver = { .driver = { .name = "fan53555-regulator", }, .probe = fan53555_regulator_probe, .remove = fan53555_regulator_remove, .id_table = fan53555_id, }; module_i2c_driver(fan53555_regulator_driver); MODULE_AUTHOR("Yunfan Zhang "); MODULE_DESCRIPTION("FAN53555 regulator driver"); MODULE_LICENSE("GPL v2");