2 * max77843.c - Regulator driver for the Maxim MAX77843
4 * Copyright (C) 2015 Samsung Electronics
5 * Author: Jaewon Kim <jaewon02.kim@samsung.com>
6 * Author: Beomho Seo <beomho.seo@samsung.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/machine.h>
18 #include <linux/mfd/max77843-private.h>
19 #include <linux/regulator/of_regulator.h>
21 enum max77843_regulator_type {
22 MAX77843_SAFEOUT1 = 0,
29 static const unsigned int max77843_safeout_voltage_table[] = {
36 static int max77843_reg_is_enabled(struct regulator_dev *rdev)
38 struct regmap *regmap = rdev->regmap;
42 ret = regmap_read(regmap, rdev->desc->enable_reg, ®);
44 dev_err(&rdev->dev, "Fialed to read charger register\n");
48 return (reg & rdev->desc->enable_mask) == rdev->desc->enable_mask;
51 static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
53 struct regmap *regmap = rdev->regmap;
54 unsigned int chg_min_uA = rdev->constraints->min_uA;
55 unsigned int chg_max_uA = rdev->constraints->max_uA;
58 unsigned int reg, sel;
60 ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, ®);
62 dev_err(&rdev->dev, "Failed to read charger register\n");
66 sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;
73 val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
80 static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
81 int min_uA, int max_uA)
83 struct regmap *regmap = rdev->regmap;
84 unsigned int chg_min_uA = rdev->constraints->min_uA;
87 while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
90 if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
95 return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
98 static struct regulator_ops max77843_charger_ops = {
99 .is_enabled = max77843_reg_is_enabled,
100 .enable = regulator_enable_regmap,
101 .disable = regulator_disable_regmap,
102 .get_current_limit = max77843_reg_get_current_limit,
103 .set_current_limit = max77843_reg_set_current_limit,
106 static struct regulator_ops max77843_regulator_ops = {
107 .is_enabled = regulator_is_enabled_regmap,
108 .enable = regulator_enable_regmap,
109 .disable = regulator_disable_regmap,
110 .list_voltage = regulator_list_voltage_table,
111 .get_voltage_sel = regulator_get_voltage_sel_regmap,
112 .set_voltage_sel = regulator_set_voltage_sel_regmap,
115 static const struct regulator_desc max77843_supported_regulators[] = {
116 [MAX77843_SAFEOUT1] = {
118 .id = MAX77843_SAFEOUT1,
119 .ops = &max77843_regulator_ops,
120 .of_match = of_match_ptr("SAFEOUT1"),
121 .regulators_node = of_match_ptr("regulators"),
122 .type = REGULATOR_VOLTAGE,
123 .owner = THIS_MODULE,
124 .n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table),
125 .volt_table = max77843_safeout_voltage_table,
126 .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
127 .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT1,
128 .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
129 .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT1_MASK,
131 [MAX77843_SAFEOUT2] = {
133 .id = MAX77843_SAFEOUT2,
134 .ops = &max77843_regulator_ops,
135 .of_match = of_match_ptr("SAFEOUT2"),
136 .regulators_node = of_match_ptr("regulators"),
137 .type = REGULATOR_VOLTAGE,
138 .owner = THIS_MODULE,
139 .n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table),
140 .volt_table = max77843_safeout_voltage_table,
141 .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
142 .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT2,
143 .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
144 .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT2_MASK,
146 [MAX77843_CHARGER] = {
148 .id = MAX77843_CHARGER,
149 .ops = &max77843_charger_ops,
150 .of_match = of_match_ptr("CHARGER"),
151 .regulators_node = of_match_ptr("regulators"),
152 .type = REGULATOR_CURRENT,
153 .owner = THIS_MODULE,
154 .enable_reg = MAX77843_CHG_REG_CHG_CNFG_00,
155 .enable_mask = MAX77843_CHG_MASK,
159 static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
162 case MAX77843_SAFEOUT1:
163 case MAX77843_SAFEOUT2:
164 return max77843->regmap;
165 case MAX77843_CHARGER:
166 return max77843->regmap_chg;
168 return max77843->regmap;
172 static int max77843_regulator_probe(struct platform_device *pdev)
174 struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
175 struct regulator_config config = {};
178 config.dev = max77843->dev;
179 config.driver_data = max77843;
181 for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
182 struct regulator_dev *regulator;
184 config.regmap = max77843_get_regmap(max77843,
185 max77843_supported_regulators[i].id);
187 regulator = devm_regulator_register(&pdev->dev,
188 &max77843_supported_regulators[i], &config);
189 if (IS_ERR(regulator)) {
191 "Failed to regiser regulator-%d\n", i);
192 return PTR_ERR(regulator);
199 static const struct platform_device_id max77843_regulator_id[] = {
200 { "max77843-regulator", },
204 static struct platform_driver max77843_regulator_driver = {
206 .name = "max77843-regulator",
208 .probe = max77843_regulator_probe,
209 .id_table = max77843_regulator_id,
212 static int __init max77843_regulator_init(void)
214 return platform_driver_register(&max77843_regulator_driver);
216 subsys_initcall(max77843_regulator_init);
218 static void __exit max77843_regulator_exit(void)
220 platform_driver_unregister(&max77843_regulator_driver);
222 module_exit(max77843_regulator_exit);
224 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
225 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
226 MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
227 MODULE_LICENSE("GPL");