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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 | ||
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, ®); | |
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, ®); | |
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"); |