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5e9384c7 KK |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // | |
3 | // max14577.c - Regulator driver for the Maxim 14577/77836 | |
4 | // | |
5 | // Copyright (C) 2013,2014 Samsung Electronics | |
6 | // Krzysztof Kozlowski <krzk@kernel.org> | |
b0902bbe KK |
7 | |
8 | #include <linux/module.h> | |
9 | #include <linux/platform_device.h> | |
10 | #include <linux/regulator/driver.h> | |
11 | #include <linux/mfd/max14577.h> | |
12 | #include <linux/mfd/max14577-private.h> | |
13 | #include <linux/regulator/of_regulator.h> | |
14 | ||
b0902bbe KK |
15 | static int max14577_reg_is_enabled(struct regulator_dev *rdev) |
16 | { | |
17 | int rid = rdev_get_id(rdev); | |
18 | struct regmap *rmap = rdev->regmap; | |
19 | u8 reg_data; | |
20 | ||
21 | switch (rid) { | |
22 | case MAX14577_CHARGER: | |
23 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); | |
24 | if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) | |
25 | return 0; | |
26 | max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); | |
27 | if ((reg_data & STATUS3_CGMBC_MASK) == 0) | |
28 | return 0; | |
29 | /* MBCHOSTEN and CGMBC are on */ | |
30 | return 1; | |
31 | default: | |
32 | return -EINVAL; | |
33 | } | |
34 | } | |
35 | ||
36 | static int max14577_reg_get_current_limit(struct regulator_dev *rdev) | |
37 | { | |
38 | u8 reg_data; | |
39 | struct regmap *rmap = rdev->regmap; | |
8a82b408 KK |
40 | struct max14577 *max14577 = rdev_get_drvdata(rdev); |
41 | const struct maxim_charger_current *limits = | |
42 | &maxim_charger_currents[max14577->dev_type]; | |
b0902bbe KK |
43 | |
44 | if (rdev_get_id(rdev) != MAX14577_CHARGER) | |
45 | return -EINVAL; | |
46 | ||
47 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); | |
48 | ||
49 | if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) | |
8a82b408 | 50 | return limits->min; |
b0902bbe KK |
51 | |
52 | reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> | |
53 | CHGCTRL4_MBCICHWRCH_SHIFT); | |
8a82b408 | 54 | return limits->high_start + reg_data * limits->high_step; |
b0902bbe KK |
55 | } |
56 | ||
57 | static int max14577_reg_set_current_limit(struct regulator_dev *rdev, | |
58 | int min_uA, int max_uA) | |
59 | { | |
b0902bbe | 60 | u8 reg_data; |
b8f139f6 | 61 | int ret; |
8a82b408 KK |
62 | struct max14577 *max14577 = rdev_get_drvdata(rdev); |
63 | const struct maxim_charger_current *limits = | |
64 | &maxim_charger_currents[max14577->dev_type]; | |
b0902bbe KK |
65 | |
66 | if (rdev_get_id(rdev) != MAX14577_CHARGER) | |
67 | return -EINVAL; | |
68 | ||
b8f139f6 KK |
69 | ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, ®_data); |
70 | if (ret) | |
71 | return ret; | |
b0902bbe KK |
72 | |
73 | return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, | |
74 | CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, | |
75 | reg_data); | |
76 | } | |
77 | ||
18c6c42c | 78 | static const struct regulator_ops max14577_safeout_ops = { |
b0902bbe KK |
79 | .is_enabled = regulator_is_enabled_regmap, |
80 | .enable = regulator_enable_regmap, | |
81 | .disable = regulator_disable_regmap, | |
82 | .list_voltage = regulator_list_voltage_linear, | |
83 | }; | |
84 | ||
18c6c42c | 85 | static const struct regulator_ops max14577_charger_ops = { |
b0902bbe KK |
86 | .is_enabled = max14577_reg_is_enabled, |
87 | .enable = regulator_enable_regmap, | |
88 | .disable = regulator_disable_regmap, | |
89 | .get_current_limit = max14577_reg_get_current_limit, | |
90 | .set_current_limit = max14577_reg_set_current_limit, | |
91 | }; | |
92 | ||
cab344d3 KK |
93 | #define MAX14577_SAFEOUT_REG { \ |
94 | .name = "SAFEOUT", \ | |
95 | .of_match = of_match_ptr("SAFEOUT"), \ | |
96 | .regulators_node = of_match_ptr("regulators"), \ | |
97 | .id = MAX14577_SAFEOUT, \ | |
98 | .ops = &max14577_safeout_ops, \ | |
99 | .type = REGULATOR_VOLTAGE, \ | |
100 | .owner = THIS_MODULE, \ | |
101 | .n_voltages = 1, \ | |
102 | .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \ | |
103 | .enable_reg = MAX14577_REG_CONTROL2, \ | |
104 | .enable_mask = CTRL2_SFOUTORD_MASK, \ | |
105 | } | |
106 | #define MAX14577_CHARGER_REG { \ | |
107 | .name = "CHARGER", \ | |
108 | .of_match = of_match_ptr("CHARGER"), \ | |
109 | .regulators_node = of_match_ptr("regulators"), \ | |
110 | .id = MAX14577_CHARGER, \ | |
111 | .ops = &max14577_charger_ops, \ | |
112 | .type = REGULATOR_CURRENT, \ | |
113 | .owner = THIS_MODULE, \ | |
114 | .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, \ | |
115 | .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, \ | |
116 | } | |
117 | ||
8a82b408 | 118 | static const struct regulator_desc max14577_supported_regulators[] = { |
cab344d3 KK |
119 | [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, |
120 | [MAX14577_CHARGER] = MAX14577_CHARGER_REG, | |
b0902bbe KK |
121 | }; |
122 | ||
18c6c42c | 123 | static const struct regulator_ops max77836_ldo_ops = { |
8a82b408 KK |
124 | .is_enabled = regulator_is_enabled_regmap, |
125 | .enable = regulator_enable_regmap, | |
126 | .disable = regulator_disable_regmap, | |
127 | .list_voltage = regulator_list_voltage_linear, | |
128 | .map_voltage = regulator_map_voltage_linear, | |
129 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
130 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
131 | /* TODO: add .set_suspend_mode */ | |
132 | }; | |
133 | ||
cab344d3 KK |
134 | #define MAX77836_LDO_REG(num) { \ |
135 | .name = "LDO" # num, \ | |
136 | .of_match = of_match_ptr("LDO" # num), \ | |
137 | .regulators_node = of_match_ptr("regulators"), \ | |
138 | .id = MAX77836_LDO ## num, \ | |
139 | .ops = &max77836_ldo_ops, \ | |
140 | .type = REGULATOR_VOLTAGE, \ | |
141 | .owner = THIS_MODULE, \ | |
142 | .n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \ | |
143 | .min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \ | |
144 | .uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \ | |
145 | .enable_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ | |
146 | .enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, \ | |
147 | .vsel_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ | |
148 | .vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, \ | |
149 | } | |
150 | ||
8a82b408 | 151 | static const struct regulator_desc max77836_supported_regulators[] = { |
cab344d3 KK |
152 | [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, |
153 | [MAX14577_CHARGER] = MAX14577_CHARGER_REG, | |
154 | [MAX77836_LDO1] = MAX77836_LDO_REG(1), | |
155 | [MAX77836_LDO2] = MAX77836_LDO_REG(2), | |
8a82b408 KK |
156 | }; |
157 | ||
0c32f8aa | 158 | /* |
8a82b408 KK |
159 | * Registers for regulators of max77836 use different I2C slave addresses so |
160 | * different regmaps must be used for them. | |
161 | * | |
162 | * Returns proper regmap for accessing regulator passed by id. | |
163 | */ | |
164 | static struct regmap *max14577_get_regmap(struct max14577 *max14577, | |
165 | int reg_id) | |
166 | { | |
167 | switch (max14577->dev_type) { | |
168 | case MAXIM_DEVICE_TYPE_MAX77836: | |
169 | switch (reg_id) { | |
170 | case MAX77836_SAFEOUT ... MAX77836_CHARGER: | |
171 | return max14577->regmap; | |
172 | default: | |
173 | /* MAX77836_LDO1 ... MAX77836_LDO2 */ | |
174 | return max14577->regmap_pmic; | |
175 | } | |
176 | ||
177 | case MAXIM_DEVICE_TYPE_MAX14577: | |
178 | default: | |
179 | return max14577->regmap; | |
180 | } | |
181 | } | |
b0902bbe KK |
182 | |
183 | static int max14577_regulator_probe(struct platform_device *pdev) | |
184 | { | |
185 | struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); | |
186 | struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); | |
e951ceef | 187 | int i, ret = 0; |
b0902bbe | 188 | struct regulator_config config = {}; |
8a82b408 KK |
189 | const struct regulator_desc *supported_regulators; |
190 | unsigned int supported_regulators_size; | |
191 | enum maxim_device_type dev_type = max14577->dev_type; | |
b0902bbe | 192 | |
8a82b408 KK |
193 | switch (dev_type) { |
194 | case MAXIM_DEVICE_TYPE_MAX77836: | |
195 | supported_regulators = max77836_supported_regulators; | |
196 | supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators); | |
197 | break; | |
198 | case MAXIM_DEVICE_TYPE_MAX14577: | |
199 | default: | |
200 | supported_regulators = max14577_supported_regulators; | |
201 | supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators); | |
202 | } | |
203 | ||
e951ceef | 204 | config.dev = max14577->dev; |
8a82b408 | 205 | config.driver_data = max14577; |
b0902bbe | 206 | |
8a82b408 | 207 | for (i = 0; i < supported_regulators_size; i++) { |
b0902bbe KK |
208 | struct regulator_dev *regulator; |
209 | /* | |
210 | * Index of supported_regulators[] is also the id and must | |
211 | * match index of pdata->regulators[]. | |
212 | */ | |
213 | if (pdata && pdata->regulators) { | |
214 | config.init_data = pdata->regulators[i].initdata; | |
215 | config.of_node = pdata->regulators[i].of_node; | |
b0902bbe | 216 | } |
8a82b408 KK |
217 | config.regmap = max14577_get_regmap(max14577, |
218 | supported_regulators[i].id); | |
b0902bbe KK |
219 | |
220 | regulator = devm_regulator_register(&pdev->dev, | |
221 | &supported_regulators[i], &config); | |
222 | if (IS_ERR(regulator)) { | |
223 | ret = PTR_ERR(regulator); | |
224 | dev_err(&pdev->dev, | |
8a82b408 KK |
225 | "Regulator init failed for %d/%s with error: %d\n", |
226 | i, supported_regulators[i].name, ret); | |
b0902bbe KK |
227 | return ret; |
228 | } | |
229 | } | |
230 | ||
231 | return ret; | |
232 | } | |
233 | ||
8a82b408 KK |
234 | static const struct platform_device_id max14577_regulator_id[] = { |
235 | { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, }, | |
236 | { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, }, | |
237 | { } | |
238 | }; | |
239 | MODULE_DEVICE_TABLE(platform, max14577_regulator_id); | |
240 | ||
b0902bbe KK |
241 | static struct platform_driver max14577_regulator_driver = { |
242 | .driver = { | |
b0902bbe KK |
243 | .name = "max14577-regulator", |
244 | }, | |
8a82b408 KK |
245 | .probe = max14577_regulator_probe, |
246 | .id_table = max14577_regulator_id, | |
b0902bbe KK |
247 | }; |
248 | ||
249 | static int __init max14577_regulator_init(void) | |
250 | { | |
8a82b408 KK |
251 | BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM); |
252 | BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM); | |
253 | ||
254 | BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN + | |
255 | (MAX77836_REGULATOR_LDO_VOLTAGE_STEP * | |
256 | (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) != | |
257 | MAX77836_REGULATOR_LDO_VOLTAGE_MAX); | |
b0902bbe KK |
258 | |
259 | return platform_driver_register(&max14577_regulator_driver); | |
260 | } | |
261 | subsys_initcall(max14577_regulator_init); | |
262 | ||
263 | static void __exit max14577_regulator_exit(void) | |
264 | { | |
265 | platform_driver_unregister(&max14577_regulator_driver); | |
266 | } | |
267 | module_exit(max14577_regulator_exit); | |
268 | ||
cea8aa3a | 269 | MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); |
8a82b408 | 270 | MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); |
b0902bbe | 271 | MODULE_LICENSE("GPL"); |