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1 /*
2  * max77843.c - Regulator driver for the Maxim MAX77843
3  *
4  * Copyright (C) 2015 Samsung Electronics
5  * Author: Jaewon Kim <jaewon02.kim@samsung.com>
6  * Author: Beomho Seo <beomho.seo@samsung.com>
7  *
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.
12  */
13
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>
20
21 enum max77843_regulator_type {
22         MAX77843_SAFEOUT1 = 0,
23         MAX77843_SAFEOUT2,
24         MAX77843_CHARGER,
25
26         MAX77843_NUM,
27 };
28
29 static const unsigned int max77843_safeout_voltage_table[] = {
30         4850000,
31         4900000,
32         4950000,
33         3300000,
34 };
35
36 static int max77843_reg_is_enabled(struct regulator_dev *rdev)
37 {
38         struct regmap *regmap = rdev->regmap;
39         int ret;
40         unsigned int reg;
41
42         ret = regmap_read(regmap, rdev->desc->enable_reg, &reg);
43         if (ret) {
44                 dev_err(&rdev->dev, "Fialed to read charger register\n");
45                 return ret;
46         }
47
48         return (reg & rdev->desc->enable_mask) == rdev->desc->enable_mask;
49 }
50
51 static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
52 {
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;
56         unsigned int val;
57         int ret;
58         unsigned int reg, sel;
59
60         ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, &reg);
61         if (ret) {
62                 dev_err(&rdev->dev, "Failed to read charger register\n");
63                 return ret;
64         }
65
66         sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;
67
68         if (sel < 0x03)
69                 sel = 0;
70         else
71                 sel -= 2;
72
73         val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
74         if (val > chg_max_uA)
75                 return -EINVAL;
76
77         return val;
78 }
79
80 static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
81                 int min_uA, int max_uA)
82 {
83         struct regmap *regmap = rdev->regmap;
84         unsigned int chg_min_uA = rdev->constraints->min_uA;
85         int sel = 0;
86
87         while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
88                 sel++;
89
90         if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
91                 return -EINVAL;
92
93         sel += 2;
94
95         return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
96 }
97
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,
104 };
105
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,
113 };
114
115 static const struct regulator_desc max77843_supported_regulators[] = {
116         [MAX77843_SAFEOUT1] = {
117                 .name           = "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,
130         },
131         [MAX77843_SAFEOUT2] = {
132                 .name           = "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,
145         },
146         [MAX77843_CHARGER] = {
147                 .name           = "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,
156         },
157 };
158
159 static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
160 {
161         switch (reg_id) {
162         case MAX77843_SAFEOUT1:
163         case MAX77843_SAFEOUT2:
164                 return max77843->regmap;
165         case MAX77843_CHARGER:
166                 return max77843->regmap_chg;
167         default:
168                 return max77843->regmap;
169         }
170 }
171
172 static int max77843_regulator_probe(struct platform_device *pdev)
173 {
174         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
175         struct regulator_config config = {};
176         int i;
177
178         config.dev = max77843->dev;
179         config.driver_data = max77843;
180
181         for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
182                 struct regulator_dev *regulator;
183
184                 config.regmap = max77843_get_regmap(max77843,
185                                 max77843_supported_regulators[i].id);
186
187                 regulator = devm_regulator_register(&pdev->dev,
188                                 &max77843_supported_regulators[i], &config);
189                 if (IS_ERR(regulator)) {
190                         dev_err(&pdev->dev,
191                                         "Failed to regiser regulator-%d\n", i);
192                         return PTR_ERR(regulator);
193                 }
194         }
195
196         return 0;
197 }
198
199 static const struct platform_device_id max77843_regulator_id[] = {
200         { "max77843-regulator", },
201         { /* sentinel */ },
202 };
203
204 static struct platform_driver max77843_regulator_driver = {
205         .driver = {
206                 .name = "max77843-regulator",
207         },
208         .probe          = max77843_regulator_probe,
209         .id_table       = max77843_regulator_id,
210 };
211
212 static int __init max77843_regulator_init(void)
213 {
214         return platform_driver_register(&max77843_regulator_driver);
215 }
216 subsys_initcall(max77843_regulator_init);
217
218 static void __exit max77843_regulator_exit(void)
219 {
220         platform_driver_unregister(&max77843_regulator_driver);
221 }
222 module_exit(max77843_regulator_exit);
223
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");