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 */
max77693_chg_get_current_limit(struct regulator_dev * rdev)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(rdev->regmap, reg_data->linear_reg, ®);
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
max77693_chg_set_current_limit(struct regulator_dev * rdev,int min_uA,int max_uA)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(rdev->regmap, reg_data->linear_reg, sel);
100 }
101 /* end of CHARGER regulator ops */
102
103 /* Returns regmap suitable for given regulator on chosen device */
max77693_get_regmap(enum max77693_types type,struct max77693_dev * max77693,int reg_id)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
max77693_pmic_probe(struct platform_device * pdev)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(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, iodev,
259 regulators[i].id);
260
261 rdev = devm_regulator_register(&pdev->dev,
262 ®ulators[i], &config);
263 if (IS_ERR(rdev)) {
264 dev_err(&pdev->dev,
265 "Failed to initialize regulator-%d\n", i);
266 return PTR_ERR(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
max77693_pmic_init(void)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
max77693_pmic_cleanup(void)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