/* * max77693.c - Regulator driver for the Maxim 77693 * * Copyright (C) 2013 Samsung Electronics * Jonghwa Lee <jonghwa3.lee@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * This driver is based on max77686.c */ #include <linux/err.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/module.h> #include <linux/export.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> #include <linux/mfd/max77693.h> #include <linux/mfd/max77693-private.h> #include <linux/regulator/of_regulator.h> #include <linux/regmap.h> #define CHGIN_ILIM_STEP_20mA 20000 /* CHARGER regulator ops */ /* CHARGER regulator uses two bits for enabling */ static int max77693_chg_is_enabled(struct regulator_dev *rdev) { int ret; unsigned int val; ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); if (ret) return ret; return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask; } /* * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA * 0x00, 0x01, 0x2, 0x03 = 60 mA * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA */ static int max77693_chg_get_current_limit(struct regulator_dev *rdev) { unsigned int chg_min_uA = rdev->constraints->min_uA; unsigned int chg_max_uA = rdev->constraints->max_uA; unsigned int reg, sel; unsigned int val; int ret; ret = regmap_read(rdev->regmap, MAX77693_CHG_REG_CHG_CNFG_09, ®); if (ret < 0) return ret; sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK; /* the first four codes for charger current are all 60mA */ if (sel <= 3) sel = 0; else sel -= 3; val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel; if (val > chg_max_uA) return -EINVAL; return val; } static int max77693_chg_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA) { unsigned int chg_min_uA = rdev->constraints->min_uA; int sel = 0; while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA) sel++; if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA) return -EINVAL; /* the first four codes for charger current are all 60mA */ sel += 3; return regmap_write(rdev->regmap, MAX77693_CHG_REG_CHG_CNFG_09, sel); } /* end of CHARGER regulator ops */ static const unsigned int max77693_safeout_table[] = { 4850000, 4900000, 4950000, 3300000, }; static struct regulator_ops max77693_safeout_ops = { .list_voltage = regulator_list_voltage_table, .is_enabled = regulator_is_enabled_regmap, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, }; static struct regulator_ops max77693_charger_ops = { .is_enabled = max77693_chg_is_enabled, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .get_current_limit = max77693_chg_get_current_limit, .set_current_limit = max77693_chg_set_current_limit, }; #define regulator_desc_esafeout(_num) { \ .name = "ESAFEOUT"#_num, \ .id = MAX77693_ESAFEOUT##_num, \ .n_voltages = 4, \ .ops = &max77693_safeout_ops, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ .volt_table = max77693_safeout_table, \ .vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ .vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \ .enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ .enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \ } static struct regulator_desc regulators[] = { regulator_desc_esafeout(1), regulator_desc_esafeout(2), { .name = "CHARGER", .id = MAX77693_CHARGER, .ops = &max77693_charger_ops, .type = REGULATOR_CURRENT, .owner = THIS_MODULE, .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00, .enable_mask = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK, }, }; #ifdef CONFIG_OF static int max77693_pmic_dt_parse_rdata(struct device *dev, struct max77693_regulator_data **rdata) { struct device_node *np; struct of_regulator_match *rmatch; struct max77693_regulator_data *tmp; int i, matched = 0; np = of_get_child_by_name(dev->parent->of_node, "regulators"); if (!np) return -EINVAL; rmatch = devm_kzalloc(dev, sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL); if (!rmatch) { of_node_put(np); return -ENOMEM; } for (i = 0; i < ARRAY_SIZE(regulators); i++) rmatch[i].name = regulators[i].name; matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators)); of_node_put(np); if (matched <= 0) return matched; *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL); if (!(*rdata)) return -ENOMEM; tmp = *rdata; for (i = 0; i < matched; i++) { tmp->initdata = rmatch[i].init_data; tmp->of_node = rmatch[i].of_node; tmp->id = regulators[i].id; tmp++; } return matched; } #else static int max77693_pmic_dt_parse_rdata(struct device *dev, struct max77693_regulator_data **rdata) { return 0; } #endif /* CONFIG_OF */ static int max77693_pmic_init_rdata(struct device *dev, struct max77693_regulator_data **rdata) { struct max77693_platform_data *pdata; int num_regulators = 0; pdata = dev_get_platdata(dev->parent); if (pdata) { *rdata = pdata->regulators; num_regulators = pdata->num_regulators; } if (!(*rdata) && dev->parent->of_node) num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata); return num_regulators; } static int max77693_pmic_probe(struct platform_device *pdev) { struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent); struct max77693_regulator_data *rdata = NULL; int num_rdata, i; struct regulator_config config = { }; num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata); if (!rdata || num_rdata <= 0) { dev_err(&pdev->dev, "No init data supplied.\n"); return -ENODEV; } config.dev = &pdev->dev; config.regmap = iodev->regmap; for (i = 0; i < num_rdata; i++) { int id = rdata[i].id; struct regulator_dev *rdev; config.init_data = rdata[i].initdata; config.of_node = rdata[i].of_node; rdev = devm_regulator_register(&pdev->dev, ®ulators[id], &config); if (IS_ERR(rdev)) { dev_err(&pdev->dev, "Failed to initialize regulator-%d\n", id); return PTR_ERR(rdev); } } return 0; } static const struct platform_device_id max77693_pmic_id[] = { {"max77693-pmic", 0}, {}, }; MODULE_DEVICE_TABLE(platform, max77693_pmic_id); static struct platform_driver max77693_pmic_driver = { .driver = { .name = "max77693-pmic", .owner = THIS_MODULE, }, .probe = max77693_pmic_probe, .id_table = max77693_pmic_id, }; module_platform_driver(max77693_pmic_driver); MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver"); MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); MODULE_LICENSE("GPL");