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b0902bbe | 1 | /* |
8a82b408 | 2 | * max14577.c - Regulator driver for the Maxim 14577/77836 |
b0902bbe | 3 | * |
4d047d6c | 4 | * Copyright (C) 2013,2014 Samsung Electronics |
cea8aa3a | 5 | * Krzysztof Kozlowski <krzk@kernel.org> |
b0902bbe KK |
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; | |
8a82b408 KK |
50 | struct max14577 *max14577 = rdev_get_drvdata(rdev); |
51 | const struct maxim_charger_current *limits = | |
52 | &maxim_charger_currents[max14577->dev_type]; | |
b0902bbe KK |
53 | |
54 | if (rdev_get_id(rdev) != MAX14577_CHARGER) | |
55 | return -EINVAL; | |
56 | ||
57 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); | |
58 | ||
59 | if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) | |
8a82b408 | 60 | return limits->min; |
b0902bbe KK |
61 | |
62 | reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> | |
63 | CHGCTRL4_MBCICHWRCH_SHIFT); | |
8a82b408 | 64 | return limits->high_start + reg_data * limits->high_step; |
b0902bbe KK |
65 | } |
66 | ||
67 | static int max14577_reg_set_current_limit(struct regulator_dev *rdev, | |
68 | int min_uA, int max_uA) | |
69 | { | |
b0902bbe | 70 | u8 reg_data; |
b8f139f6 | 71 | int ret; |
8a82b408 KK |
72 | struct max14577 *max14577 = rdev_get_drvdata(rdev); |
73 | const struct maxim_charger_current *limits = | |
74 | &maxim_charger_currents[max14577->dev_type]; | |
b0902bbe KK |
75 | |
76 | if (rdev_get_id(rdev) != MAX14577_CHARGER) | |
77 | return -EINVAL; | |
78 | ||
b8f139f6 KK |
79 | ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, ®_data); |
80 | if (ret) | |
81 | return ret; | |
b0902bbe KK |
82 | |
83 | return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, | |
84 | CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, | |
85 | reg_data); | |
86 | } | |
87 | ||
88 | static struct regulator_ops max14577_safeout_ops = { | |
89 | .is_enabled = regulator_is_enabled_regmap, | |
90 | .enable = regulator_enable_regmap, | |
91 | .disable = regulator_disable_regmap, | |
92 | .list_voltage = regulator_list_voltage_linear, | |
93 | }; | |
94 | ||
95 | static struct regulator_ops max14577_charger_ops = { | |
96 | .is_enabled = max14577_reg_is_enabled, | |
97 | .enable = regulator_enable_regmap, | |
98 | .disable = regulator_disable_regmap, | |
99 | .get_current_limit = max14577_reg_get_current_limit, | |
100 | .set_current_limit = max14577_reg_set_current_limit, | |
101 | }; | |
102 | ||
cab344d3 KK |
103 | #define MAX14577_SAFEOUT_REG { \ |
104 | .name = "SAFEOUT", \ | |
105 | .of_match = of_match_ptr("SAFEOUT"), \ | |
106 | .regulators_node = of_match_ptr("regulators"), \ | |
107 | .id = MAX14577_SAFEOUT, \ | |
108 | .ops = &max14577_safeout_ops, \ | |
109 | .type = REGULATOR_VOLTAGE, \ | |
110 | .owner = THIS_MODULE, \ | |
111 | .n_voltages = 1, \ | |
112 | .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \ | |
113 | .enable_reg = MAX14577_REG_CONTROL2, \ | |
114 | .enable_mask = CTRL2_SFOUTORD_MASK, \ | |
115 | } | |
116 | #define MAX14577_CHARGER_REG { \ | |
117 | .name = "CHARGER", \ | |
118 | .of_match = of_match_ptr("CHARGER"), \ | |
119 | .regulators_node = of_match_ptr("regulators"), \ | |
120 | .id = MAX14577_CHARGER, \ | |
121 | .ops = &max14577_charger_ops, \ | |
122 | .type = REGULATOR_CURRENT, \ | |
123 | .owner = THIS_MODULE, \ | |
124 | .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, \ | |
125 | .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, \ | |
126 | } | |
127 | ||
8a82b408 | 128 | static const struct regulator_desc max14577_supported_regulators[] = { |
cab344d3 KK |
129 | [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, |
130 | [MAX14577_CHARGER] = MAX14577_CHARGER_REG, | |
b0902bbe KK |
131 | }; |
132 | ||
8a82b408 KK |
133 | static struct regulator_ops max77836_ldo_ops = { |
134 | .is_enabled = regulator_is_enabled_regmap, | |
135 | .enable = regulator_enable_regmap, | |
136 | .disable = regulator_disable_regmap, | |
137 | .list_voltage = regulator_list_voltage_linear, | |
138 | .map_voltage = regulator_map_voltage_linear, | |
139 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
140 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
141 | /* TODO: add .set_suspend_mode */ | |
142 | }; | |
143 | ||
cab344d3 KK |
144 | #define MAX77836_LDO_REG(num) { \ |
145 | .name = "LDO" # num, \ | |
146 | .of_match = of_match_ptr("LDO" # num), \ | |
147 | .regulators_node = of_match_ptr("regulators"), \ | |
148 | .id = MAX77836_LDO ## num, \ | |
149 | .ops = &max77836_ldo_ops, \ | |
150 | .type = REGULATOR_VOLTAGE, \ | |
151 | .owner = THIS_MODULE, \ | |
152 | .n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \ | |
153 | .min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \ | |
154 | .uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \ | |
155 | .enable_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ | |
156 | .enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, \ | |
157 | .vsel_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ | |
158 | .vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, \ | |
159 | } | |
160 | ||
8a82b408 | 161 | static const struct regulator_desc max77836_supported_regulators[] = { |
cab344d3 KK |
162 | [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, |
163 | [MAX14577_CHARGER] = MAX14577_CHARGER_REG, | |
164 | [MAX77836_LDO1] = MAX77836_LDO_REG(1), | |
165 | [MAX77836_LDO2] = MAX77836_LDO_REG(2), | |
8a82b408 KK |
166 | }; |
167 | ||
b0902bbe KK |
168 | #ifdef CONFIG_OF |
169 | static struct of_regulator_match max14577_regulator_matches[] = { | |
170 | { .name = "SAFEOUT", }, | |
171 | { .name = "CHARGER", }, | |
172 | }; | |
173 | ||
8a82b408 KK |
174 | static struct of_regulator_match max77836_regulator_matches[] = { |
175 | { .name = "SAFEOUT", }, | |
176 | { .name = "CHARGER", }, | |
177 | { .name = "LDO1", }, | |
178 | { .name = "LDO2", }, | |
179 | }; | |
180 | ||
8a82b408 KK |
181 | static inline struct regulator_init_data *match_init_data(int index, |
182 | enum maxim_device_type dev_type) | |
b0902bbe | 183 | { |
8a82b408 KK |
184 | switch (dev_type) { |
185 | case MAXIM_DEVICE_TYPE_MAX77836: | |
186 | return max77836_regulator_matches[index].init_data; | |
187 | ||
188 | case MAXIM_DEVICE_TYPE_MAX14577: | |
189 | default: | |
190 | return max14577_regulator_matches[index].init_data; | |
191 | } | |
b0902bbe KK |
192 | } |
193 | ||
8a82b408 KK |
194 | static inline struct device_node *match_of_node(int index, |
195 | enum maxim_device_type dev_type) | |
b0902bbe | 196 | { |
8a82b408 KK |
197 | switch (dev_type) { |
198 | case MAXIM_DEVICE_TYPE_MAX77836: | |
199 | return max77836_regulator_matches[index].of_node; | |
200 | ||
201 | case MAXIM_DEVICE_TYPE_MAX14577: | |
202 | default: | |
203 | return max14577_regulator_matches[index].of_node; | |
204 | } | |
b0902bbe KK |
205 | } |
206 | #else /* CONFIG_OF */ | |
8a82b408 KK |
207 | static inline struct regulator_init_data *match_init_data(int index, |
208 | enum maxim_device_type dev_type) | |
b0902bbe KK |
209 | { |
210 | return NULL; | |
211 | } | |
212 | ||
8a82b408 KK |
213 | static inline struct device_node *match_of_node(int index, |
214 | enum maxim_device_type dev_type) | |
b0902bbe KK |
215 | { |
216 | return NULL; | |
217 | } | |
218 | #endif /* CONFIG_OF */ | |
219 | ||
8a82b408 KK |
220 | /** |
221 | * Registers for regulators of max77836 use different I2C slave addresses so | |
222 | * different regmaps must be used for them. | |
223 | * | |
224 | * Returns proper regmap for accessing regulator passed by id. | |
225 | */ | |
226 | static struct regmap *max14577_get_regmap(struct max14577 *max14577, | |
227 | int reg_id) | |
228 | { | |
229 | switch (max14577->dev_type) { | |
230 | case MAXIM_DEVICE_TYPE_MAX77836: | |
231 | switch (reg_id) { | |
232 | case MAX77836_SAFEOUT ... MAX77836_CHARGER: | |
233 | return max14577->regmap; | |
234 | default: | |
235 | /* MAX77836_LDO1 ... MAX77836_LDO2 */ | |
236 | return max14577->regmap_pmic; | |
237 | } | |
238 | ||
239 | case MAXIM_DEVICE_TYPE_MAX14577: | |
240 | default: | |
241 | return max14577->regmap; | |
242 | } | |
243 | } | |
b0902bbe KK |
244 | |
245 | static int max14577_regulator_probe(struct platform_device *pdev) | |
246 | { | |
247 | struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); | |
248 | struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); | |
e951ceef | 249 | int i, ret = 0; |
b0902bbe | 250 | struct regulator_config config = {}; |
8a82b408 KK |
251 | const struct regulator_desc *supported_regulators; |
252 | unsigned int supported_regulators_size; | |
253 | enum maxim_device_type dev_type = max14577->dev_type; | |
b0902bbe | 254 | |
8a82b408 KK |
255 | switch (dev_type) { |
256 | case MAXIM_DEVICE_TYPE_MAX77836: | |
257 | supported_regulators = max77836_supported_regulators; | |
258 | supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators); | |
259 | break; | |
260 | case MAXIM_DEVICE_TYPE_MAX14577: | |
261 | default: | |
262 | supported_regulators = max14577_supported_regulators; | |
263 | supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators); | |
264 | } | |
265 | ||
e951ceef | 266 | config.dev = max14577->dev; |
8a82b408 | 267 | config.driver_data = max14577; |
b0902bbe | 268 | |
8a82b408 | 269 | for (i = 0; i < supported_regulators_size; i++) { |
b0902bbe KK |
270 | struct regulator_dev *regulator; |
271 | /* | |
272 | * Index of supported_regulators[] is also the id and must | |
273 | * match index of pdata->regulators[]. | |
274 | */ | |
275 | if (pdata && pdata->regulators) { | |
276 | config.init_data = pdata->regulators[i].initdata; | |
277 | config.of_node = pdata->regulators[i].of_node; | |
278 | } else { | |
8a82b408 KK |
279 | config.init_data = match_init_data(i, dev_type); |
280 | config.of_node = match_of_node(i, dev_type); | |
b0902bbe | 281 | } |
8a82b408 KK |
282 | config.regmap = max14577_get_regmap(max14577, |
283 | supported_regulators[i].id); | |
b0902bbe KK |
284 | |
285 | regulator = devm_regulator_register(&pdev->dev, | |
286 | &supported_regulators[i], &config); | |
287 | if (IS_ERR(regulator)) { | |
288 | ret = PTR_ERR(regulator); | |
289 | dev_err(&pdev->dev, | |
8a82b408 KK |
290 | "Regulator init failed for %d/%s with error: %d\n", |
291 | i, supported_regulators[i].name, ret); | |
b0902bbe KK |
292 | return ret; |
293 | } | |
294 | } | |
295 | ||
296 | return ret; | |
297 | } | |
298 | ||
8a82b408 KK |
299 | static const struct platform_device_id max14577_regulator_id[] = { |
300 | { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, }, | |
301 | { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, }, | |
302 | { } | |
303 | }; | |
304 | MODULE_DEVICE_TABLE(platform, max14577_regulator_id); | |
305 | ||
b0902bbe KK |
306 | static struct platform_driver max14577_regulator_driver = { |
307 | .driver = { | |
b0902bbe KK |
308 | .name = "max14577-regulator", |
309 | }, | |
8a82b408 KK |
310 | .probe = max14577_regulator_probe, |
311 | .id_table = max14577_regulator_id, | |
b0902bbe KK |
312 | }; |
313 | ||
314 | static int __init max14577_regulator_init(void) | |
315 | { | |
8a82b408 KK |
316 | BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM); |
317 | BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM); | |
318 | ||
319 | BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN + | |
320 | (MAX77836_REGULATOR_LDO_VOLTAGE_STEP * | |
321 | (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) != | |
322 | MAX77836_REGULATOR_LDO_VOLTAGE_MAX); | |
b0902bbe KK |
323 | |
324 | return platform_driver_register(&max14577_regulator_driver); | |
325 | } | |
326 | subsys_initcall(max14577_regulator_init); | |
327 | ||
328 | static void __exit max14577_regulator_exit(void) | |
329 | { | |
330 | platform_driver_unregister(&max14577_regulator_driver); | |
331 | } | |
332 | module_exit(max14577_regulator_exit); | |
333 | ||
cea8aa3a | 334 | MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); |
8a82b408 | 335 | MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); |
b0902bbe | 336 | MODULE_LICENSE("GPL"); |
9f45a3dd | 337 | MODULE_ALIAS("platform:max14577-regulator"); |