1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // |
3 | // max77693.c - Regulator driver for the Maxim 77693 and 77843 |
4 | // |
5 | // Copyright (C) 2013-2015 Samsung Electronics |
6 | // Jonghwa Lee <jonghwa3.lee@samsung.com> |
7 | // Krzysztof Kozlowski <krzk@kernel.org> |
8 | // |
9 | // This driver is based on max77686.c |
10 | |
11 | #include <linux/err.h> |
12 | #include <linux/slab.h> |
13 | #include <linux/platform_device.h> |
14 | #include <linux/module.h> |
15 | #include <linux/export.h> |
16 | #include <linux/regulator/driver.h> |
17 | #include <linux/regulator/machine.h> |
18 | #include <linux/mfd/max77693.h> |
19 | #include <linux/mfd/max77693-common.h> |
20 | #include <linux/mfd/max77693-private.h> |
21 | #include <linux/mfd/max77843-private.h> |
22 | #include <linux/regulator/of_regulator.h> |
23 | #include <linux/regmap.h> |
24 | |
25 | /* |
26 | * ID for MAX77843 regulators. |
27 | * There is no need for such for MAX77693. |
28 | */ |
29 | enum max77843_regulator_type { |
30 | MAX77843_SAFEOUT1 = 0, |
31 | MAX77843_SAFEOUT2, |
32 | MAX77843_CHARGER, |
33 | |
34 | MAX77843_NUM, |
35 | }; |
36 | |
37 | /* Register differences between chargers: MAX77693 and MAX77843 */ |
38 | struct chg_reg_data { |
39 | unsigned int linear_reg; |
40 | unsigned int linear_mask; |
41 | unsigned int uA_step; |
42 | unsigned int min_sel; |
43 | }; |
44 | |
45 | /* |
46 | * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA |
47 | * 0x00, 0x01, 0x2, 0x03 = 60 mA |
48 | * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA |
49 | * Actually for MAX77693 the driver manipulates the maximum input current, |
50 | * not the fast charge current (output). This should be fixed. |
51 | * |
52 | * On MAX77843 the calculation formula is the same (except values). |
53 | * Fortunately it properly manipulates the fast charge current. |
54 | */ |
55 | static int max77693_chg_get_current_limit(struct regulator_dev *rdev) |
56 | { |
57 | const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev); |
58 | unsigned int chg_min_uA = rdev->constraints->min_uA; |
59 | unsigned int chg_max_uA = rdev->constraints->max_uA; |
60 | unsigned int reg, sel; |
61 | unsigned int val; |
62 | int ret; |
63 | |
64 | ret = regmap_read(map: rdev->regmap, reg: reg_data->linear_reg, val: ®); |
65 | if (ret < 0) |
66 | return ret; |
67 | |
68 | sel = reg & reg_data->linear_mask; |
69 | |
70 | /* the first four codes for charger current are all 60mA */ |
71 | if (sel <= reg_data->min_sel) |
72 | sel = 0; |
73 | else |
74 | sel -= reg_data->min_sel; |
75 | |
76 | val = chg_min_uA + reg_data->uA_step * sel; |
77 | if (val > chg_max_uA) |
78 | return -EINVAL; |
79 | |
80 | return val; |
81 | } |
82 | |
83 | static int max77693_chg_set_current_limit(struct regulator_dev *rdev, |
84 | int min_uA, int max_uA) |
85 | { |
86 | const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev); |
87 | unsigned int chg_min_uA = rdev->constraints->min_uA; |
88 | int sel = 0; |
89 | |
90 | while (chg_min_uA + reg_data->uA_step * sel < min_uA) |
91 | sel++; |
92 | |
93 | if (chg_min_uA + reg_data->uA_step * sel > max_uA) |
94 | return -EINVAL; |
95 | |
96 | /* the first four codes for charger current are all 60mA */ |
97 | sel += reg_data->min_sel; |
98 | |
99 | return regmap_write(map: rdev->regmap, reg: reg_data->linear_reg, val: sel); |
100 | } |
101 | /* end of CHARGER regulator ops */ |
102 | |
103 | /* Returns regmap suitable for given regulator on chosen device */ |
104 | static struct regmap *max77693_get_regmap(enum max77693_types type, |
105 | struct max77693_dev *max77693, |
106 | int reg_id) |
107 | { |
108 | if (type == TYPE_MAX77693) |
109 | return max77693->regmap; |
110 | |
111 | /* Else: TYPE_MAX77843 */ |
112 | switch (reg_id) { |
113 | case MAX77843_SAFEOUT1: |
114 | case MAX77843_SAFEOUT2: |
115 | return max77693->regmap; |
116 | case MAX77843_CHARGER: |
117 | return max77693->regmap_chg; |
118 | default: |
119 | return max77693->regmap; |
120 | } |
121 | } |
122 | |
123 | static const unsigned int max77693_safeout_table[] = { |
124 | 4850000, |
125 | 4900000, |
126 | 4950000, |
127 | 3300000, |
128 | }; |
129 | |
130 | static const struct regulator_ops max77693_safeout_ops = { |
131 | .list_voltage = regulator_list_voltage_table, |
132 | .is_enabled = regulator_is_enabled_regmap, |
133 | .enable = regulator_enable_regmap, |
134 | .disable = regulator_disable_regmap, |
135 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
136 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
137 | }; |
138 | |
139 | static const struct regulator_ops max77693_charger_ops = { |
140 | .is_enabled = regulator_is_enabled_regmap, |
141 | .enable = regulator_enable_regmap, |
142 | .disable = regulator_disable_regmap, |
143 | .get_current_limit = max77693_chg_get_current_limit, |
144 | .set_current_limit = max77693_chg_set_current_limit, |
145 | }; |
146 | |
147 | #define max77693_regulator_desc_esafeout(_num) { \ |
148 | .name = "ESAFEOUT"#_num, \ |
149 | .id = MAX77693_ESAFEOUT##_num, \ |
150 | .of_match = of_match_ptr("ESAFEOUT"#_num), \ |
151 | .regulators_node = of_match_ptr("regulators"), \ |
152 | .n_voltages = 4, \ |
153 | .ops = &max77693_safeout_ops, \ |
154 | .type = REGULATOR_VOLTAGE, \ |
155 | .owner = THIS_MODULE, \ |
156 | .volt_table = max77693_safeout_table, \ |
157 | .vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ |
158 | .vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \ |
159 | .enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ |
160 | .enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \ |
161 | } |
162 | |
163 | static const struct regulator_desc max77693_supported_regulators[] = { |
164 | max77693_regulator_desc_esafeout(1), |
165 | max77693_regulator_desc_esafeout(2), |
166 | { |
167 | .name = "CHARGER" , |
168 | .id = MAX77693_CHARGER, |
169 | .of_match = of_match_ptr("CHARGER" ), |
170 | .regulators_node = of_match_ptr("regulators" ), |
171 | .ops = &max77693_charger_ops, |
172 | .type = REGULATOR_CURRENT, |
173 | .owner = THIS_MODULE, |
174 | .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00, |
175 | .enable_mask = CHG_CNFG_00_CHG_MASK | |
176 | CHG_CNFG_00_BUCK_MASK, |
177 | .enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK, |
178 | }, |
179 | }; |
180 | |
181 | static const struct chg_reg_data max77693_chg_reg_data = { |
182 | .linear_reg = MAX77693_CHG_REG_CHG_CNFG_09, |
183 | .linear_mask = CHG_CNFG_09_CHGIN_ILIM_MASK, |
184 | .uA_step = 20000, |
185 | .min_sel = 3, |
186 | }; |
187 | |
188 | #define max77843_regulator_desc_esafeout(num) { \ |
189 | .name = "SAFEOUT" # num, \ |
190 | .id = MAX77843_SAFEOUT ## num, \ |
191 | .ops = &max77693_safeout_ops, \ |
192 | .of_match = of_match_ptr("SAFEOUT" # num), \ |
193 | .regulators_node = of_match_ptr("regulators"), \ |
194 | .type = REGULATOR_VOLTAGE, \ |
195 | .owner = THIS_MODULE, \ |
196 | .n_voltages = ARRAY_SIZE(max77693_safeout_table), \ |
197 | .volt_table = max77693_safeout_table, \ |
198 | .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \ |
199 | .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \ |
200 | .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \ |
201 | .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \ |
202 | } |
203 | |
204 | static const struct regulator_desc max77843_supported_regulators[] = { |
205 | [MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1), |
206 | [MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2), |
207 | [MAX77843_CHARGER] = { |
208 | .name = "CHARGER" , |
209 | .id = MAX77843_CHARGER, |
210 | .ops = &max77693_charger_ops, |
211 | .of_match = of_match_ptr("CHARGER" ), |
212 | .regulators_node = of_match_ptr("regulators" ), |
213 | .type = REGULATOR_CURRENT, |
214 | .owner = THIS_MODULE, |
215 | .enable_reg = MAX77843_CHG_REG_CHG_CNFG_00, |
216 | .enable_mask = MAX77843_CHG_MASK, |
217 | .enable_val = MAX77843_CHG_MASK, |
218 | }, |
219 | }; |
220 | |
221 | static const struct chg_reg_data max77843_chg_reg_data = { |
222 | .linear_reg = MAX77843_CHG_REG_CHG_CNFG_02, |
223 | .linear_mask = MAX77843_CHG_FAST_CHG_CURRENT_MASK, |
224 | .uA_step = MAX77843_CHG_FAST_CHG_CURRENT_STEP, |
225 | .min_sel = 2, |
226 | }; |
227 | |
228 | static int max77693_pmic_probe(struct platform_device *pdev) |
229 | { |
230 | enum max77693_types type = platform_get_device_id(pdev)->driver_data; |
231 | struct max77693_dev *iodev = dev_get_drvdata(dev: pdev->dev.parent); |
232 | const struct regulator_desc *regulators; |
233 | unsigned int regulators_size; |
234 | int i; |
235 | struct regulator_config config = { }; |
236 | |
237 | config.dev = iodev->dev; |
238 | |
239 | switch (type) { |
240 | case TYPE_MAX77693: |
241 | regulators = max77693_supported_regulators; |
242 | regulators_size = ARRAY_SIZE(max77693_supported_regulators); |
243 | config.driver_data = (void *)&max77693_chg_reg_data; |
244 | break; |
245 | case TYPE_MAX77843: |
246 | regulators = max77843_supported_regulators; |
247 | regulators_size = ARRAY_SIZE(max77843_supported_regulators); |
248 | config.driver_data = (void *)&max77843_chg_reg_data; |
249 | break; |
250 | default: |
251 | dev_err(&pdev->dev, "Unsupported device type: %u\n" , type); |
252 | return -ENODEV; |
253 | } |
254 | |
255 | for (i = 0; i < regulators_size; i++) { |
256 | struct regulator_dev *rdev; |
257 | |
258 | config.regmap = max77693_get_regmap(type, max77693: iodev, |
259 | reg_id: regulators[i].id); |
260 | |
261 | rdev = devm_regulator_register(dev: &pdev->dev, |
262 | regulator_desc: ®ulators[i], config: &config); |
263 | if (IS_ERR(ptr: rdev)) { |
264 | dev_err(&pdev->dev, |
265 | "Failed to initialize regulator-%d\n" , i); |
266 | return PTR_ERR(ptr: rdev); |
267 | } |
268 | } |
269 | |
270 | return 0; |
271 | } |
272 | |
273 | static const struct platform_device_id max77693_pmic_id[] = { |
274 | { "max77693-pmic" , TYPE_MAX77693 }, |
275 | { "max77843-regulator" , TYPE_MAX77843 }, |
276 | {}, |
277 | }; |
278 | |
279 | MODULE_DEVICE_TABLE(platform, max77693_pmic_id); |
280 | |
281 | static struct platform_driver max77693_pmic_driver = { |
282 | .driver = { |
283 | .name = "max77693-pmic" , |
284 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
285 | }, |
286 | .probe = max77693_pmic_probe, |
287 | .id_table = max77693_pmic_id, |
288 | }; |
289 | |
290 | static int __init max77693_pmic_init(void) |
291 | { |
292 | return platform_driver_register(&max77693_pmic_driver); |
293 | } |
294 | subsys_initcall(max77693_pmic_init); |
295 | |
296 | static void __exit max77693_pmic_cleanup(void) |
297 | { |
298 | platform_driver_unregister(&max77693_pmic_driver); |
299 | } |
300 | module_exit(max77693_pmic_cleanup); |
301 | |
302 | MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver" ); |
303 | MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>" ); |
304 | MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>" ); |
305 | MODULE_LICENSE("GPL" ); |
306 | |