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9dfffb7a JK |
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 | ||
9dfffb7a JK |
36 | static int max77843_reg_get_current_limit(struct regulator_dev *rdev) |
37 | { | |
38 | struct regmap *regmap = rdev->regmap; | |
39 | unsigned int chg_min_uA = rdev->constraints->min_uA; | |
40 | unsigned int chg_max_uA = rdev->constraints->max_uA; | |
41 | unsigned int val; | |
42 | int ret; | |
43 | unsigned int reg, sel; | |
44 | ||
45 | ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, ®); | |
46 | if (ret) { | |
47 | dev_err(&rdev->dev, "Failed to read charger register\n"); | |
48 | return ret; | |
49 | } | |
50 | ||
51 | sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK; | |
52 | ||
53 | if (sel < 0x03) | |
54 | sel = 0; | |
55 | else | |
56 | sel -= 2; | |
57 | ||
58 | val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel; | |
59 | if (val > chg_max_uA) | |
60 | return -EINVAL; | |
61 | ||
62 | return val; | |
63 | } | |
64 | ||
65 | static int max77843_reg_set_current_limit(struct regulator_dev *rdev, | |
66 | int min_uA, int max_uA) | |
67 | { | |
68 | struct regmap *regmap = rdev->regmap; | |
69 | unsigned int chg_min_uA = rdev->constraints->min_uA; | |
70 | int sel = 0; | |
71 | ||
72 | while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA) | |
73 | sel++; | |
74 | ||
75 | if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA) | |
76 | return -EINVAL; | |
77 | ||
78 | sel += 2; | |
79 | ||
80 | return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel); | |
81 | } | |
82 | ||
83 | static struct regulator_ops max77843_charger_ops = { | |
6986f44c | 84 | .is_enabled = regulator_is_enabled_regmap, |
9dfffb7a JK |
85 | .enable = regulator_enable_regmap, |
86 | .disable = regulator_disable_regmap, | |
87 | .get_current_limit = max77843_reg_get_current_limit, | |
88 | .set_current_limit = max77843_reg_set_current_limit, | |
89 | }; | |
90 | ||
91 | static struct regulator_ops max77843_regulator_ops = { | |
92 | .is_enabled = regulator_is_enabled_regmap, | |
93 | .enable = regulator_enable_regmap, | |
94 | .disable = regulator_disable_regmap, | |
95 | .list_voltage = regulator_list_voltage_table, | |
96 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
97 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
98 | }; | |
99 | ||
ec03c08d KK |
100 | #define MAX77843_SAFEOUT(num) { \ |
101 | .name = "SAFEOUT" # num, \ | |
102 | .id = MAX77843_SAFEOUT ## num, \ | |
103 | .ops = &max77843_regulator_ops, \ | |
104 | .of_match = of_match_ptr("SAFEOUT" # num), \ | |
105 | .regulators_node = of_match_ptr("regulators"), \ | |
106 | .type = REGULATOR_VOLTAGE, \ | |
107 | .owner = THIS_MODULE, \ | |
108 | .n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table), \ | |
109 | .volt_table = max77843_safeout_voltage_table, \ | |
110 | .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \ | |
111 | .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \ | |
112 | .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \ | |
113 | .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \ | |
114 | } | |
115 | ||
9dfffb7a | 116 | static const struct regulator_desc max77843_supported_regulators[] = { |
ec03c08d KK |
117 | [MAX77843_SAFEOUT1] = MAX77843_SAFEOUT(1), |
118 | [MAX77843_SAFEOUT2] = MAX77843_SAFEOUT(2), | |
9dfffb7a JK |
119 | [MAX77843_CHARGER] = { |
120 | .name = "CHARGER", | |
121 | .id = MAX77843_CHARGER, | |
122 | .ops = &max77843_charger_ops, | |
123 | .of_match = of_match_ptr("CHARGER"), | |
124 | .regulators_node = of_match_ptr("regulators"), | |
125 | .type = REGULATOR_CURRENT, | |
126 | .owner = THIS_MODULE, | |
127 | .enable_reg = MAX77843_CHG_REG_CHG_CNFG_00, | |
b7c960d5 | 128 | .enable_mask = MAX77843_CHG_MASK | MAX77843_CHG_BUCK_MASK, |
6986f44c | 129 | .enable_val = MAX77843_CHG_MASK | MAX77843_CHG_BUCK_MASK, |
9dfffb7a JK |
130 | }, |
131 | }; | |
132 | ||
133 | static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id) | |
134 | { | |
135 | switch (reg_id) { | |
136 | case MAX77843_SAFEOUT1: | |
137 | case MAX77843_SAFEOUT2: | |
138 | return max77843->regmap; | |
139 | case MAX77843_CHARGER: | |
140 | return max77843->regmap_chg; | |
141 | default: | |
142 | return max77843->regmap; | |
143 | } | |
144 | } | |
145 | ||
146 | static int max77843_regulator_probe(struct platform_device *pdev) | |
147 | { | |
148 | struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent); | |
149 | struct regulator_config config = {}; | |
150 | int i; | |
151 | ||
152 | config.dev = max77843->dev; | |
153 | config.driver_data = max77843; | |
154 | ||
155 | for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) { | |
156 | struct regulator_dev *regulator; | |
157 | ||
158 | config.regmap = max77843_get_regmap(max77843, | |
159 | max77843_supported_regulators[i].id); | |
160 | ||
161 | regulator = devm_regulator_register(&pdev->dev, | |
162 | &max77843_supported_regulators[i], &config); | |
163 | if (IS_ERR(regulator)) { | |
164 | dev_err(&pdev->dev, | |
165 | "Failed to regiser regulator-%d\n", i); | |
166 | return PTR_ERR(regulator); | |
167 | } | |
168 | } | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static const struct platform_device_id max77843_regulator_id[] = { | |
174 | { "max77843-regulator", }, | |
175 | { /* sentinel */ }, | |
176 | }; | |
177 | ||
178 | static struct platform_driver max77843_regulator_driver = { | |
179 | .driver = { | |
180 | .name = "max77843-regulator", | |
181 | }, | |
182 | .probe = max77843_regulator_probe, | |
183 | .id_table = max77843_regulator_id, | |
184 | }; | |
185 | ||
186 | static int __init max77843_regulator_init(void) | |
187 | { | |
188 | return platform_driver_register(&max77843_regulator_driver); | |
189 | } | |
190 | subsys_initcall(max77843_regulator_init); | |
191 | ||
192 | static void __exit max77843_regulator_exit(void) | |
193 | { | |
194 | platform_driver_unregister(&max77843_regulator_driver); | |
195 | } | |
196 | module_exit(max77843_regulator_exit); | |
197 | ||
198 | MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>"); | |
199 | MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>"); | |
200 | MODULE_DESCRIPTION("Maxim MAX77843 regulator driver"); | |
201 | MODULE_LICENSE("GPL"); |