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+/*
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+ * max77843.c - Regulator driver for the Maxim MAX77843
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+ *
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+ * Copyright (C) 2015 Samsung Electronics
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+ * Author: Jaewon Kim <jaewon02.kim@samsung.com>
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+ * Author: Beomho Seo <beomho.seo@samsung.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/regulator/driver.h>
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+#include <linux/regulator/machine.h>
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+#include <linux/mfd/max77843-private.h>
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+#include <linux/regulator/of_regulator.h>
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+
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+enum max77843_regulator_type {
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+ MAX77843_SAFEOUT1 = 0,
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+ MAX77843_SAFEOUT2,
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+ MAX77843_CHARGER,
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+
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+ MAX77843_NUM,
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+};
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+
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+static const unsigned int max77843_safeout_voltage_table[] = {
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+ 4850000,
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+ 4900000,
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+ 4950000,
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+ 3300000,
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+};
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+
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+static int max77843_reg_is_enabled(struct regulator_dev *rdev)
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+{
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+ struct regmap *regmap = rdev->regmap;
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+ int ret;
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+ unsigned int reg;
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+
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+ ret = regmap_read(regmap, rdev->desc->enable_reg, ®);
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+ if (ret) {
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+ dev_err(&rdev->dev, "Fialed to read charger register\n");
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+ return ret;
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+ }
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+
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+ return (reg & rdev->desc->enable_mask) == rdev->desc->enable_mask;
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+}
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+
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+static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
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+{
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+ struct regmap *regmap = rdev->regmap;
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+ unsigned int chg_min_uA = rdev->constraints->min_uA;
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+ unsigned int chg_max_uA = rdev->constraints->max_uA;
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+ unsigned int val;
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+ int ret;
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+ unsigned int reg, sel;
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+
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+ ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, ®);
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+ if (ret) {
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+ dev_err(&rdev->dev, "Failed to read charger register\n");
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+ return ret;
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+ }
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+
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+ sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;
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+
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+ if (sel < 0x03)
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+ sel = 0;
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+ else
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+ sel -= 2;
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+
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+ val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
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+ if (val > chg_max_uA)
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+ return -EINVAL;
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+
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+ return val;
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+}
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+
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+static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
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+ int min_uA, int max_uA)
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+{
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+ struct regmap *regmap = rdev->regmap;
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+ unsigned int chg_min_uA = rdev->constraints->min_uA;
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+ int sel = 0;
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+
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+ while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
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+ sel++;
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+
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+ if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
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+ return -EINVAL;
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+
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+ sel += 2;
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+
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+ return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
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+}
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+
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+static struct regulator_ops max77843_charger_ops = {
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+ .is_enabled = max77843_reg_is_enabled,
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+ .enable = regulator_enable_regmap,
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+ .disable = regulator_disable_regmap,
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+ .get_current_limit = max77843_reg_get_current_limit,
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+ .set_current_limit = max77843_reg_set_current_limit,
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+};
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+
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+static struct regulator_ops max77843_regulator_ops = {
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+ .is_enabled = regulator_is_enabled_regmap,
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+ .enable = regulator_enable_regmap,
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+ .disable = regulator_disable_regmap,
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+ .list_voltage = regulator_list_voltage_table,
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+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
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+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
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+};
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+
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+static const struct regulator_desc max77843_supported_regulators[] = {
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+ [MAX77843_SAFEOUT1] = {
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+ .name = "SAFEOUT1",
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+ .id = MAX77843_SAFEOUT1,
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+ .ops = &max77843_regulator_ops,
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+ .of_match = of_match_ptr("SAFEOUT1"),
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+ .regulators_node = of_match_ptr("regulators"),
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table),
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+ .volt_table = max77843_safeout_voltage_table,
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+ .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
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+ .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT1,
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+ .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
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+ .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT1_MASK,
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+ },
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+ [MAX77843_SAFEOUT2] = {
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+ .name = "SAFEOUT2",
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+ .id = MAX77843_SAFEOUT2,
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+ .ops = &max77843_regulator_ops,
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+ .of_match = of_match_ptr("SAFEOUT2"),
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+ .regulators_node = of_match_ptr("regulators"),
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table),
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+ .volt_table = max77843_safeout_voltage_table,
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+ .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
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+ .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT2,
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+ .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
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+ .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT2_MASK,
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+ },
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+ [MAX77843_CHARGER] = {
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+ .name = "CHARGER",
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+ .id = MAX77843_CHARGER,
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+ .ops = &max77843_charger_ops,
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+ .of_match = of_match_ptr("CHARGER"),
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+ .regulators_node = of_match_ptr("regulators"),
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+ .type = REGULATOR_CURRENT,
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+ .owner = THIS_MODULE,
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+ .enable_reg = MAX77843_CHG_REG_CHG_CNFG_00,
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+ .enable_mask = MAX77843_CHG_MASK,
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+ },
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+};
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+
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+static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
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+{
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+ switch (reg_id) {
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+ case MAX77843_SAFEOUT1:
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+ case MAX77843_SAFEOUT2:
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+ return max77843->regmap;
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+ case MAX77843_CHARGER:
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+ return max77843->regmap_chg;
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+ default:
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+ return max77843->regmap;
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+ }
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+}
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+
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+static int max77843_regulator_probe(struct platform_device *pdev)
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+{
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+ struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
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+ struct regulator_config config = {};
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+ int i;
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+
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+ config.dev = max77843->dev;
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+ config.driver_data = max77843;
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+
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+ for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
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+ struct regulator_dev *regulator;
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+
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+ config.regmap = max77843_get_regmap(max77843,
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+ max77843_supported_regulators[i].id);
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+
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+ regulator = devm_regulator_register(&pdev->dev,
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+ &max77843_supported_regulators[i], &config);
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+ if (IS_ERR(regulator)) {
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+ dev_err(&pdev->dev,
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+ "Failed to regiser regulator-%d\n", i);
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+ return PTR_ERR(regulator);
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+static const struct platform_device_id max77843_regulator_id[] = {
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+ { "max77843-regulator", },
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+ { /* sentinel */ },
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+};
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+
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+static struct platform_driver max77843_regulator_driver = {
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+ .driver = {
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+ .name = "max77843-regulator",
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+ },
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+ .probe = max77843_regulator_probe,
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+ .id_table = max77843_regulator_id,
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+};
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+
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+static int __init max77843_regulator_init(void)
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+{
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+ return platform_driver_register(&max77843_regulator_driver);
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+}
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+subsys_initcall(max77843_regulator_init);
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+
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+static void __exit max77843_regulator_exit(void)
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+{
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+ platform_driver_unregister(&max77843_regulator_driver);
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+}
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+module_exit(max77843_regulator_exit);
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+
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+MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
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+MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
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+MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
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+MODULE_LICENSE("GPL");
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Mark Brown
10 years ago