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b0902bbe KK |
1 | /* |
2 | * max14577.c - Regulator driver for the Maxim 14577 | |
3 | * | |
4d047d6c | 4 | * Copyright (C) 2013,2014 Samsung Electronics |
b0902bbe KK |
5 | * Krzysztof Kozlowski <k.kozlowski@samsung.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/regulator/driver.h> | |
21 | #include <linux/mfd/max14577.h> | |
22 | #include <linux/mfd/max14577-private.h> | |
23 | #include <linux/regulator/of_regulator.h> | |
24 | ||
b0902bbe KK |
25 | static int max14577_reg_is_enabled(struct regulator_dev *rdev) |
26 | { | |
27 | int rid = rdev_get_id(rdev); | |
28 | struct regmap *rmap = rdev->regmap; | |
29 | u8 reg_data; | |
30 | ||
31 | switch (rid) { | |
32 | case MAX14577_CHARGER: | |
33 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); | |
34 | if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) | |
35 | return 0; | |
36 | max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); | |
37 | if ((reg_data & STATUS3_CGMBC_MASK) == 0) | |
38 | return 0; | |
39 | /* MBCHOSTEN and CGMBC are on */ | |
40 | return 1; | |
41 | default: | |
42 | return -EINVAL; | |
43 | } | |
44 | } | |
45 | ||
46 | static int max14577_reg_get_current_limit(struct regulator_dev *rdev) | |
47 | { | |
48 | u8 reg_data; | |
49 | struct regmap *rmap = rdev->regmap; | |
50 | ||
51 | if (rdev_get_id(rdev) != MAX14577_CHARGER) | |
52 | return -EINVAL; | |
53 | ||
54 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); | |
55 | ||
56 | if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) | |
57 | return MAX14577_REGULATOR_CURRENT_LIMIT_MIN; | |
58 | ||
59 | reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> | |
60 | CHGCTRL4_MBCICHWRCH_SHIFT); | |
61 | return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START + | |
62 | reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP; | |
63 | } | |
64 | ||
65 | static int max14577_reg_set_current_limit(struct regulator_dev *rdev, | |
66 | int min_uA, int max_uA) | |
67 | { | |
68 | int i, current_bits = 0xf; | |
69 | u8 reg_data; | |
70 | ||
71 | if (rdev_get_id(rdev) != MAX14577_CHARGER) | |
72 | return -EINVAL; | |
73 | ||
74 | if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX || | |
75 | max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN) | |
76 | return -EINVAL; | |
77 | ||
78 | if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) { | |
79 | /* Less than 200 mA, so set 90mA (turn only Low Bit off) */ | |
80 | u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT; | |
81 | return max14577_update_reg(rdev->regmap, | |
82 | MAX14577_CHG_REG_CHG_CTRL4, | |
83 | CHGCTRL4_MBCICHWRCL_MASK, reg_data); | |
84 | } | |
85 | ||
86 | /* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for | |
87 | * valid current starting from LIMIT_MAX. */ | |
88 | for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX; | |
89 | i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START; | |
90 | i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) { | |
91 | if (i <= max_uA) | |
92 | break; | |
93 | current_bits--; | |
94 | } | |
95 | BUG_ON(current_bits < 0); /* Cannot happen */ | |
96 | /* Turn Low Bit on (use range 200mA-950 mA) */ | |
97 | reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT; | |
98 | /* and set proper High Bits */ | |
99 | reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT; | |
100 | ||
101 | return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, | |
102 | CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, | |
103 | reg_data); | |
104 | } | |
105 | ||
106 | static struct regulator_ops max14577_safeout_ops = { | |
107 | .is_enabled = regulator_is_enabled_regmap, | |
108 | .enable = regulator_enable_regmap, | |
109 | .disable = regulator_disable_regmap, | |
110 | .list_voltage = regulator_list_voltage_linear, | |
111 | }; | |
112 | ||
113 | static struct regulator_ops max14577_charger_ops = { | |
114 | .is_enabled = max14577_reg_is_enabled, | |
115 | .enable = regulator_enable_regmap, | |
116 | .disable = regulator_disable_regmap, | |
117 | .get_current_limit = max14577_reg_get_current_limit, | |
118 | .set_current_limit = max14577_reg_set_current_limit, | |
119 | }; | |
120 | ||
121 | static const struct regulator_desc supported_regulators[] = { | |
122 | [MAX14577_SAFEOUT] = { | |
123 | .name = "SAFEOUT", | |
124 | .id = MAX14577_SAFEOUT, | |
125 | .ops = &max14577_safeout_ops, | |
126 | .type = REGULATOR_VOLTAGE, | |
127 | .owner = THIS_MODULE, | |
128 | .n_voltages = 1, | |
129 | .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, | |
130 | .enable_reg = MAX14577_REG_CONTROL2, | |
131 | .enable_mask = CTRL2_SFOUTORD_MASK, | |
132 | }, | |
133 | [MAX14577_CHARGER] = { | |
134 | .name = "CHARGER", | |
135 | .id = MAX14577_CHARGER, | |
136 | .ops = &max14577_charger_ops, | |
137 | .type = REGULATOR_CURRENT, | |
138 | .owner = THIS_MODULE, | |
139 | .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, | |
140 | .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, | |
141 | }, | |
142 | }; | |
143 | ||
144 | #ifdef CONFIG_OF | |
145 | static struct of_regulator_match max14577_regulator_matches[] = { | |
146 | { .name = "SAFEOUT", }, | |
147 | { .name = "CHARGER", }, | |
148 | }; | |
149 | ||
150 | static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev) | |
151 | { | |
152 | int ret; | |
153 | struct device_node *np; | |
154 | ||
155 | np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); | |
156 | if (!np) { | |
157 | dev_err(&pdev->dev, "Failed to get child OF node for regulators\n"); | |
158 | return -EINVAL; | |
159 | } | |
160 | ||
161 | ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches, | |
162 | MAX14577_REG_MAX); | |
08221fc4 | 163 | if (ret < 0) |
b0902bbe | 164 | dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret); |
08221fc4 KK |
165 | else |
166 | ret = 0; | |
b0902bbe | 167 | |
667a6b7a KK |
168 | of_node_put(np); |
169 | ||
170 | return ret; | |
b0902bbe KK |
171 | } |
172 | ||
173 | static inline struct regulator_init_data *match_init_data(int index) | |
174 | { | |
175 | return max14577_regulator_matches[index].init_data; | |
176 | } | |
177 | ||
178 | static inline struct device_node *match_of_node(int index) | |
179 | { | |
180 | return max14577_regulator_matches[index].of_node; | |
181 | } | |
182 | #else /* CONFIG_OF */ | |
183 | static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev) | |
184 | { | |
185 | return 0; | |
186 | } | |
187 | static inline struct regulator_init_data *match_init_data(int index) | |
188 | { | |
189 | return NULL; | |
190 | } | |
191 | ||
192 | static inline struct device_node *match_of_node(int index) | |
193 | { | |
194 | return NULL; | |
195 | } | |
196 | #endif /* CONFIG_OF */ | |
197 | ||
198 | ||
199 | static int max14577_regulator_probe(struct platform_device *pdev) | |
200 | { | |
201 | struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); | |
202 | struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); | |
203 | int i, ret; | |
204 | struct regulator_config config = {}; | |
205 | ||
206 | ret = max14577_regulator_dt_parse_pdata(pdev); | |
207 | if (ret) | |
208 | return ret; | |
209 | ||
210 | config.dev = &pdev->dev; | |
211 | config.regmap = max14577->regmap; | |
212 | ||
213 | for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) { | |
214 | struct regulator_dev *regulator; | |
215 | /* | |
216 | * Index of supported_regulators[] is also the id and must | |
217 | * match index of pdata->regulators[]. | |
218 | */ | |
219 | if (pdata && pdata->regulators) { | |
220 | config.init_data = pdata->regulators[i].initdata; | |
221 | config.of_node = pdata->regulators[i].of_node; | |
222 | } else { | |
223 | config.init_data = match_init_data(i); | |
224 | config.of_node = match_of_node(i); | |
225 | } | |
226 | ||
227 | regulator = devm_regulator_register(&pdev->dev, | |
228 | &supported_regulators[i], &config); | |
229 | if (IS_ERR(regulator)) { | |
230 | ret = PTR_ERR(regulator); | |
231 | dev_err(&pdev->dev, | |
232 | "Regulator init failed for ID %d with error: %d\n", | |
233 | i, ret); | |
234 | return ret; | |
235 | } | |
236 | } | |
237 | ||
238 | return ret; | |
239 | } | |
240 | ||
241 | static struct platform_driver max14577_regulator_driver = { | |
242 | .driver = { | |
243 | .owner = THIS_MODULE, | |
244 | .name = "max14577-regulator", | |
245 | }, | |
246 | .probe = max14577_regulator_probe, | |
247 | }; | |
248 | ||
249 | static int __init max14577_regulator_init(void) | |
250 | { | |
251 | BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START + | |
252 | MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf != | |
253 | MAX14577_REGULATOR_CURRENT_LIMIT_MAX); | |
254 | BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX); | |
255 | ||
256 | return platform_driver_register(&max14577_regulator_driver); | |
257 | } | |
258 | subsys_initcall(max14577_regulator_init); | |
259 | ||
260 | static void __exit max14577_regulator_exit(void) | |
261 | { | |
262 | platform_driver_unregister(&max14577_regulator_driver); | |
263 | } | |
264 | module_exit(max14577_regulator_exit); | |
265 | ||
266 | MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); | |
267 | MODULE_DESCRIPTION("MAXIM 14577 regulator driver"); | |
268 | MODULE_LICENSE("GPL"); | |
9f45a3dd | 269 | MODULE_ALIAS("platform:max14577-regulator"); |