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// SPDX-License-Identifier: GPL-2.0+//// max77693.c - Regulator driver for the Maxim 77693 and 77843//// Copyright (C) 2013-2015 Samsung Electronics// Jonghwa Lee <jonghwa3.lee@samsung.com>// Krzysztof Kozlowski <krzk@kernel.org>//// This driver is based on max77686.c/* * ID for MAX77843 regulators. * There is no need for such for MAX77693. */enum max77843_regulator_type { MAX77843_SAFEOUT1 = 0, MAX77843_SAFEOUT2, MAX77843_CHARGER, MAX77843_NUM,};/* Register differences between chargers: MAX77693 and MAX77843 */struct chg_reg_data { unsigned int linear_reg; unsigned int linear_mask; unsigned int uA_step; unsigned int min_sel;};/* * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA * 0x00, 0x01, 0x2, 0x03 = 60 mA * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA * Actually for MAX77693 the driver manipulates the maximum input current, * not the fast charge current (output). This should be fixed. * * On MAX77843 the calculation formula is the same (except values). * Fortunately it properly manipulates the fast charge current. */static int max77693_chg_get_current_limit(struct regulator_dev *rdev){ const struct chg_reg_data *reg_data = rdev_get_drvdata(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, reg_data->linear_reg, ®); if (ret < 0) return ret; sel = reg & reg_data->linear_mask; /* the first four codes for charger current are all 60mA */ if (sel <= reg_data->min_sel) sel = 0; else sel -= reg_data->min_sel; val = chg_min_uA + reg_data->uA_step * 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){ const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev); unsigned int chg_min_uA = rdev->constraints->min_uA; int sel = 0; while (chg_min_uA + reg_data->uA_step * sel < min_uA) sel++;