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b0902bbe KK |
1 | /* |
2 | * max14577.c - Regulator driver for the Maxim 14577 | |
3 | * | |
4 | * Copyright (C) 2013 Samsung Electronics | |
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 | ||
25 | struct max14577_regulator { | |
26 | struct device *dev; | |
27 | struct max14577 *max14577; | |
28 | struct regulator_dev **regulators; | |
29 | }; | |
30 | ||
31 | static int max14577_reg_is_enabled(struct regulator_dev *rdev) | |
32 | { | |
33 | int rid = rdev_get_id(rdev); | |
34 | struct regmap *rmap = rdev->regmap; | |
35 | u8 reg_data; | |
36 | ||
37 | switch (rid) { | |
38 | case MAX14577_CHARGER: | |
39 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); | |
40 | if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) | |
41 | return 0; | |
42 | max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); | |
43 | if ((reg_data & STATUS3_CGMBC_MASK) == 0) | |
44 | return 0; | |
45 | /* MBCHOSTEN and CGMBC are on */ | |
46 | return 1; | |
47 | default: | |
48 | return -EINVAL; | |
49 | } | |
50 | } | |
51 | ||
52 | static int max14577_reg_get_current_limit(struct regulator_dev *rdev) | |
53 | { | |
54 | u8 reg_data; | |
55 | struct regmap *rmap = rdev->regmap; | |
56 | ||
57 | if (rdev_get_id(rdev) != MAX14577_CHARGER) | |
58 | return -EINVAL; | |
59 | ||
60 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); | |
61 | ||
62 | if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) | |
63 | return MAX14577_REGULATOR_CURRENT_LIMIT_MIN; | |
64 | ||
65 | reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> | |
66 | CHGCTRL4_MBCICHWRCH_SHIFT); | |
67 | return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START + | |
68 | reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP; | |
69 | } | |
70 | ||
71 | static int max14577_reg_set_current_limit(struct regulator_dev *rdev, | |
72 | int min_uA, int max_uA) | |
73 | { | |
74 | int i, current_bits = 0xf; | |
75 | u8 reg_data; | |
76 | ||
77 | if (rdev_get_id(rdev) != MAX14577_CHARGER) | |
78 | return -EINVAL; | |
79 | ||
80 | if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX || | |
81 | max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN) | |
82 | return -EINVAL; | |
83 | ||
84 | if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) { | |
85 | /* Less than 200 mA, so set 90mA (turn only Low Bit off) */ | |
86 | u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT; | |
87 | return max14577_update_reg(rdev->regmap, | |
88 | MAX14577_CHG_REG_CHG_CTRL4, | |
89 | CHGCTRL4_MBCICHWRCL_MASK, reg_data); | |
90 | } | |
91 | ||
92 | /* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for | |
93 | * valid current starting from LIMIT_MAX. */ | |
94 | for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX; | |
95 | i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START; | |
96 | i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) { | |
97 | if (i <= max_uA) | |
98 | break; | |
99 | current_bits--; | |
100 | } | |
101 | BUG_ON(current_bits < 0); /* Cannot happen */ | |
102 | /* Turn Low Bit on (use range 200mA-950 mA) */ | |
103 | reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT; | |
104 | /* and set proper High Bits */ | |
105 | reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT; | |
106 | ||
107 | return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, | |
108 | CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, | |
109 | reg_data); | |
110 | } | |
111 | ||
112 | static struct regulator_ops max14577_safeout_ops = { | |
113 | .is_enabled = regulator_is_enabled_regmap, | |
114 | .enable = regulator_enable_regmap, | |
115 | .disable = regulator_disable_regmap, | |
116 | .list_voltage = regulator_list_voltage_linear, | |
117 | }; | |
118 | ||
119 | static struct regulator_ops max14577_charger_ops = { | |
120 | .is_enabled = max14577_reg_is_enabled, | |
121 | .enable = regulator_enable_regmap, | |
122 | .disable = regulator_disable_regmap, | |
123 | .get_current_limit = max14577_reg_get_current_limit, | |
124 | .set_current_limit = max14577_reg_set_current_limit, | |
125 | }; | |
126 | ||
127 | static const struct regulator_desc supported_regulators[] = { | |
128 | [MAX14577_SAFEOUT] = { | |
129 | .name = "SAFEOUT", | |
130 | .id = MAX14577_SAFEOUT, | |
131 | .ops = &max14577_safeout_ops, | |
132 | .type = REGULATOR_VOLTAGE, | |
133 | .owner = THIS_MODULE, | |
134 | .n_voltages = 1, | |
135 | .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, | |
136 | .enable_reg = MAX14577_REG_CONTROL2, | |
137 | .enable_mask = CTRL2_SFOUTORD_MASK, | |
138 | }, | |
139 | [MAX14577_CHARGER] = { | |
140 | .name = "CHARGER", | |
141 | .id = MAX14577_CHARGER, | |
142 | .ops = &max14577_charger_ops, | |
143 | .type = REGULATOR_CURRENT, | |
144 | .owner = THIS_MODULE, | |
145 | .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, | |
146 | .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, | |
147 | }, | |
148 | }; | |
149 | ||
150 | #ifdef CONFIG_OF | |
151 | static struct of_regulator_match max14577_regulator_matches[] = { | |
152 | { .name = "SAFEOUT", }, | |
153 | { .name = "CHARGER", }, | |
154 | }; | |
155 | ||
156 | static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev) | |
157 | { | |
158 | int ret; | |
159 | struct device_node *np; | |
160 | ||
161 | np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); | |
162 | if (!np) { | |
163 | dev_err(&pdev->dev, "Failed to get child OF node for regulators\n"); | |
164 | return -EINVAL; | |
165 | } | |
166 | ||
167 | ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches, | |
168 | MAX14577_REG_MAX); | |
08221fc4 | 169 | if (ret < 0) |
b0902bbe | 170 | dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret); |
08221fc4 KK |
171 | else |
172 | ret = 0; | |
b0902bbe | 173 | |
667a6b7a KK |
174 | of_node_put(np); |
175 | ||
176 | return ret; | |
b0902bbe KK |
177 | } |
178 | ||
179 | static inline struct regulator_init_data *match_init_data(int index) | |
180 | { | |
181 | return max14577_regulator_matches[index].init_data; | |
182 | } | |
183 | ||
184 | static inline struct device_node *match_of_node(int index) | |
185 | { | |
186 | return max14577_regulator_matches[index].of_node; | |
187 | } | |
188 | #else /* CONFIG_OF */ | |
189 | static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev) | |
190 | { | |
191 | return 0; | |
192 | } | |
193 | static inline struct regulator_init_data *match_init_data(int index) | |
194 | { | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | static inline struct device_node *match_of_node(int index) | |
199 | { | |
200 | return NULL; | |
201 | } | |
202 | #endif /* CONFIG_OF */ | |
203 | ||
204 | ||
205 | static int max14577_regulator_probe(struct platform_device *pdev) | |
206 | { | |
207 | struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); | |
208 | struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); | |
209 | int i, ret; | |
210 | struct regulator_config config = {}; | |
211 | ||
212 | ret = max14577_regulator_dt_parse_pdata(pdev); | |
213 | if (ret) | |
214 | return ret; | |
215 | ||
216 | config.dev = &pdev->dev; | |
217 | config.regmap = max14577->regmap; | |
218 | ||
219 | for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) { | |
220 | struct regulator_dev *regulator; | |
221 | /* | |
222 | * Index of supported_regulators[] is also the id and must | |
223 | * match index of pdata->regulators[]. | |
224 | */ | |
225 | if (pdata && pdata->regulators) { | |
226 | config.init_data = pdata->regulators[i].initdata; | |
227 | config.of_node = pdata->regulators[i].of_node; | |
228 | } else { | |
229 | config.init_data = match_init_data(i); | |
230 | config.of_node = match_of_node(i); | |
231 | } | |
232 | ||
233 | regulator = devm_regulator_register(&pdev->dev, | |
234 | &supported_regulators[i], &config); | |
235 | if (IS_ERR(regulator)) { | |
236 | ret = PTR_ERR(regulator); | |
237 | dev_err(&pdev->dev, | |
238 | "Regulator init failed for ID %d with error: %d\n", | |
239 | i, ret); | |
240 | return ret; | |
241 | } | |
242 | } | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
247 | static struct platform_driver max14577_regulator_driver = { | |
248 | .driver = { | |
249 | .owner = THIS_MODULE, | |
250 | .name = "max14577-regulator", | |
251 | }, | |
252 | .probe = max14577_regulator_probe, | |
253 | }; | |
254 | ||
255 | static int __init max14577_regulator_init(void) | |
256 | { | |
257 | BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START + | |
258 | MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf != | |
259 | MAX14577_REGULATOR_CURRENT_LIMIT_MAX); | |
260 | BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX); | |
261 | ||
262 | return platform_driver_register(&max14577_regulator_driver); | |
263 | } | |
264 | subsys_initcall(max14577_regulator_init); | |
265 | ||
266 | static void __exit max14577_regulator_exit(void) | |
267 | { | |
268 | platform_driver_unregister(&max14577_regulator_driver); | |
269 | } | |
270 | module_exit(max14577_regulator_exit); | |
271 | ||
272 | MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); | |
273 | MODULE_DESCRIPTION("MAXIM 14577 regulator driver"); | |
274 | MODULE_LICENSE("GPL"); | |
9f45a3dd | 275 | MODULE_ALIAS("platform:max14577-regulator"); |