1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (C) 2018 BayLibre SAS
4 // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
5 //
6 // Regulator driver for MAXIM 77650/77651 charger/power-supply.
7
8 #include <linux/of.h>
9 #include <linux/mfd/max77650.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/regmap.h>
13 #include <linux/regulator/driver.h>
14
15 #define MAX77650_REGULATOR_EN_CTRL_MASK GENMASK(3, 0)
16 #define MAX77650_REGULATOR_EN_CTRL_BITS(_reg) \
17 ((_reg) & MAX77650_REGULATOR_EN_CTRL_MASK)
18 #define MAX77650_REGULATOR_ENABLED GENMASK(2, 1)
19 #define MAX77650_REGULATOR_DISABLED BIT(2)
20
21 #define MAX77650_REGULATOR_V_LDO_MASK GENMASK(6, 0)
22 #define MAX77650_REGULATOR_V_SBB_MASK GENMASK(5, 0)
23 #define MAX77651_REGULATOR_V_SBB1_MASK GENMASK(5, 2)
24 #define MAX77651_REGULATOR_V_SBB1_RANGE_MASK GENMASK(1, 0)
25
26 #define MAX77650_REGULATOR_AD_MASK BIT(3)
27 #define MAX77650_REGULATOR_AD_DISABLED 0x00
28 #define MAX77650_REGULATOR_AD_ENABLED BIT(3)
29
30 #define MAX77650_REGULATOR_CURR_LIM_MASK GENMASK(7, 6)
31
32 enum {
33 MAX77650_REGULATOR_ID_LDO = 0,
34 MAX77650_REGULATOR_ID_SBB0,
35 MAX77650_REGULATOR_ID_SBB1,
36 MAX77650_REGULATOR_ID_SBB2,
37 MAX77650_REGULATOR_NUM_REGULATORS,
38 };
39
40 struct max77650_regulator_desc {
41 struct regulator_desc desc;
42 unsigned int regA;
43 unsigned int regB;
44 };
45
46 static const unsigned int max77651_sbb1_volt_range_sel[] = {
47 0x0, 0x1, 0x2, 0x3
48 };
49
50 static const struct linear_range max77651_sbb1_volt_ranges[] = {
51 /* range index 0 */
52 REGULATOR_LINEAR_RANGE(2400000, 0x00, 0x0f, 50000),
53 /* range index 1 */
54 REGULATOR_LINEAR_RANGE(3200000, 0x00, 0x0f, 50000),
55 /* range index 2 */
56 REGULATOR_LINEAR_RANGE(4000000, 0x00, 0x0f, 50000),
57 /* range index 3 */
58 REGULATOR_LINEAR_RANGE(4800000, 0x00, 0x09, 50000),
59 };
60
61 static const unsigned int max77650_current_limit_table[] = {
62 1000000, 866000, 707000, 500000,
63 };
64
max77650_regulator_is_enabled(struct regulator_dev * rdev)65 static int max77650_regulator_is_enabled(struct regulator_dev *rdev)
66 {
67 const struct max77650_regulator_desc *rdesc;
68 struct regmap *map;
69 int val, rv, en;
70
71 rdesc = container_of(rdev->desc, struct max77650_regulator_desc, desc);
72 map = rdev_get_regmap(rdev);
73
74 rv = regmap_read(map, rdesc->regB, &val);
75 if (rv)
76 return rv;
77
78 en = MAX77650_REGULATOR_EN_CTRL_BITS(val);
79
80 return en != MAX77650_REGULATOR_DISABLED;
81 }
82
max77650_regulator_enable(struct regulator_dev * rdev)83 static int max77650_regulator_enable(struct regulator_dev *rdev)
84 {
85 const struct max77650_regulator_desc *rdesc;
86 struct regmap *map;
87
88 rdesc = container_of(rdev->desc, struct max77650_regulator_desc, desc);
89 map = rdev_get_regmap(rdev);
90
91 return regmap_update_bits(map, rdesc->regB,
92 MAX77650_REGULATOR_EN_CTRL_MASK,
93 MAX77650_REGULATOR_ENABLED);
94 }
95
max77650_regulator_disable(struct regulator_dev * rdev)96 static int max77650_regulator_disable(struct regulator_dev *rdev)
97 {
98 const struct max77650_regulator_desc *rdesc;
99 struct regmap *map;
100
101 rdesc = container_of(rdev->desc, struct max77650_regulator_desc, desc);
102 map = rdev_get_regmap(rdev);
103
104 return regmap_update_bits(map, rdesc->regB,
105 MAX77650_REGULATOR_EN_CTRL_MASK,
106 MAX77650_REGULATOR_DISABLED);
107 }
108
109 static const struct regulator_ops max77650_regulator_LDO_ops = {
110 .is_enabled = max77650_regulator_is_enabled,
111 .enable = max77650_regulator_enable,
112 .disable = max77650_regulator_disable,
113 .list_voltage = regulator_list_voltage_linear,
114 .map_voltage = regulator_map_voltage_linear,
115 .get_voltage_sel = regulator_get_voltage_sel_regmap,
116 .set_voltage_sel = regulator_set_voltage_sel_regmap,
117 .set_active_discharge = regulator_set_active_discharge_regmap,
118 };
119
120 static const struct regulator_ops max77650_regulator_SBB_ops = {
121 .is_enabled = max77650_regulator_is_enabled,
122 .enable = max77650_regulator_enable,
123 .disable = max77650_regulator_disable,
124 .list_voltage = regulator_list_voltage_linear,
125 .map_voltage = regulator_map_voltage_linear,
126 .get_voltage_sel = regulator_get_voltage_sel_regmap,
127 .set_voltage_sel = regulator_set_voltage_sel_regmap,
128 .get_current_limit = regulator_get_current_limit_regmap,
129 .set_current_limit = regulator_set_current_limit_regmap,
130 .set_active_discharge = regulator_set_active_discharge_regmap,
131 };
132
133 /* Special case for max77651 SBB1 - pickable linear-range voltage mapping. */
134 static const struct regulator_ops max77651_SBB1_regulator_ops = {
135 .is_enabled = max77650_regulator_is_enabled,
136 .enable = max77650_regulator_enable,
137 .disable = max77650_regulator_disable,
138 .list_voltage = regulator_list_voltage_pickable_linear_range,
139 .get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
140 .set_voltage_sel = regulator_set_voltage_sel_pickable_regmap,
141 .get_current_limit = regulator_get_current_limit_regmap,
142 .set_current_limit = regulator_set_current_limit_regmap,
143 .set_active_discharge = regulator_set_active_discharge_regmap,
144 };
145
146 static const struct max77650_regulator_desc max77650_LDO_desc = {
147 .desc = {
148 .name = "ldo",
149 .of_match = of_match_ptr("ldo"),
150 .regulators_node = of_match_ptr("regulators"),
151 .supply_name = "in-ldo",
152 .id = MAX77650_REGULATOR_ID_LDO,
153 .ops = &max77650_regulator_LDO_ops,
154 .min_uV = 1350000,
155 .uV_step = 12500,
156 .n_voltages = 128,
157 .vsel_step = 1,
158 .vsel_mask = MAX77650_REGULATOR_V_LDO_MASK,
159 .vsel_reg = MAX77650_REG_CNFG_LDO_A,
160 .active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
161 .active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
162 .active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
163 .active_discharge_reg = MAX77650_REG_CNFG_LDO_B,
164 .enable_time = 100,
165 .type = REGULATOR_VOLTAGE,
166 .owner = THIS_MODULE,
167 },
168 .regA = MAX77650_REG_CNFG_LDO_A,
169 .regB = MAX77650_REG_CNFG_LDO_B,
170 };
171
172 static const struct max77650_regulator_desc max77650_SBB0_desc = {
173 .desc = {
174 .name = "sbb0",
175 .of_match = of_match_ptr("sbb0"),
176 .regulators_node = of_match_ptr("regulators"),
177 .supply_name = "in-sbb0",
178 .id = MAX77650_REGULATOR_ID_SBB0,
179 .ops = &max77650_regulator_SBB_ops,
180 .min_uV = 800000,
181 .uV_step = 25000,
182 .n_voltages = 64,
183 .vsel_step = 1,
184 .vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
185 .vsel_reg = MAX77650_REG_CNFG_SBB0_A,
186 .active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
187 .active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
188 .active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
189 .active_discharge_reg = MAX77650_REG_CNFG_SBB0_B,
190 .enable_time = 100,
191 .type = REGULATOR_VOLTAGE,
192 .owner = THIS_MODULE,
193 .csel_reg = MAX77650_REG_CNFG_SBB0_A,
194 .csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
195 .curr_table = max77650_current_limit_table,
196 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
197 },
198 .regA = MAX77650_REG_CNFG_SBB0_A,
199 .regB = MAX77650_REG_CNFG_SBB0_B,
200 };
201
202 static const struct max77650_regulator_desc max77650_SBB1_desc = {
203 .desc = {
204 .name = "sbb1",
205 .of_match = of_match_ptr("sbb1"),
206 .regulators_node = of_match_ptr("regulators"),
207 .supply_name = "in-sbb1",
208 .id = MAX77650_REGULATOR_ID_SBB1,
209 .ops = &max77650_regulator_SBB_ops,
210 .min_uV = 800000,
211 .uV_step = 12500,
212 .n_voltages = 64,
213 .vsel_step = 1,
214 .vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
215 .vsel_reg = MAX77650_REG_CNFG_SBB1_A,
216 .active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
217 .active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
218 .active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
219 .active_discharge_reg = MAX77650_REG_CNFG_SBB1_B,
220 .enable_time = 100,
221 .type = REGULATOR_VOLTAGE,
222 .owner = THIS_MODULE,
223 .csel_reg = MAX77650_REG_CNFG_SBB1_A,
224 .csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
225 .curr_table = max77650_current_limit_table,
226 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
227 },
228 .regA = MAX77650_REG_CNFG_SBB1_A,
229 .regB = MAX77650_REG_CNFG_SBB1_B,
230 };
231
232 static const struct max77650_regulator_desc max77651_SBB1_desc = {
233 .desc = {
234 .name = "sbb1",
235 .of_match = of_match_ptr("sbb1"),
236 .regulators_node = of_match_ptr("regulators"),
237 .supply_name = "in-sbb1",
238 .id = MAX77650_REGULATOR_ID_SBB1,
239 .ops = &max77651_SBB1_regulator_ops,
240 .linear_range_selectors_bitfield = max77651_sbb1_volt_range_sel,
241 .linear_ranges = max77651_sbb1_volt_ranges,
242 .n_linear_ranges = ARRAY_SIZE(max77651_sbb1_volt_ranges),
243 .n_voltages = 58,
244 .vsel_step = 1,
245 .vsel_range_mask = MAX77651_REGULATOR_V_SBB1_RANGE_MASK,
246 .vsel_range_reg = MAX77650_REG_CNFG_SBB1_A,
247 .vsel_mask = MAX77651_REGULATOR_V_SBB1_MASK,
248 .vsel_reg = MAX77650_REG_CNFG_SBB1_A,
249 .active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
250 .active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
251 .active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
252 .active_discharge_reg = MAX77650_REG_CNFG_SBB1_B,
253 .enable_time = 100,
254 .type = REGULATOR_VOLTAGE,
255 .owner = THIS_MODULE,
256 .csel_reg = MAX77650_REG_CNFG_SBB1_A,
257 .csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
258 .curr_table = max77650_current_limit_table,
259 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
260 },
261 .regA = MAX77650_REG_CNFG_SBB1_A,
262 .regB = MAX77650_REG_CNFG_SBB1_B,
263 };
264
265 static const struct max77650_regulator_desc max77650_SBB2_desc = {
266 .desc = {
267 .name = "sbb2",
268 .of_match = of_match_ptr("sbb2"),
269 .regulators_node = of_match_ptr("regulators"),
270 .supply_name = "in-sbb0",
271 .id = MAX77650_REGULATOR_ID_SBB2,
272 .ops = &max77650_regulator_SBB_ops,
273 .min_uV = 800000,
274 .uV_step = 50000,
275 .n_voltages = 64,
276 .vsel_step = 1,
277 .vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
278 .vsel_reg = MAX77650_REG_CNFG_SBB2_A,
279 .active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
280 .active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
281 .active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
282 .active_discharge_reg = MAX77650_REG_CNFG_SBB2_B,
283 .enable_time = 100,
284 .type = REGULATOR_VOLTAGE,
285 .owner = THIS_MODULE,
286 .csel_reg = MAX77650_REG_CNFG_SBB2_A,
287 .csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
288 .curr_table = max77650_current_limit_table,
289 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
290 },
291 .regA = MAX77650_REG_CNFG_SBB2_A,
292 .regB = MAX77650_REG_CNFG_SBB2_B,
293 };
294
295 static const struct max77650_regulator_desc max77651_SBB2_desc = {
296 .desc = {
297 .name = "sbb2",
298 .of_match = of_match_ptr("sbb2"),
299 .regulators_node = of_match_ptr("regulators"),
300 .supply_name = "in-sbb0",
301 .id = MAX77650_REGULATOR_ID_SBB2,
302 .ops = &max77650_regulator_SBB_ops,
303 .min_uV = 2400000,
304 .uV_step = 50000,
305 .n_voltages = 64,
306 .vsel_step = 1,
307 .vsel_mask = MAX77650_REGULATOR_V_SBB_MASK,
308 .vsel_reg = MAX77650_REG_CNFG_SBB2_A,
309 .active_discharge_off = MAX77650_REGULATOR_AD_DISABLED,
310 .active_discharge_on = MAX77650_REGULATOR_AD_ENABLED,
311 .active_discharge_mask = MAX77650_REGULATOR_AD_MASK,
312 .active_discharge_reg = MAX77650_REG_CNFG_SBB2_B,
313 .enable_time = 100,
314 .type = REGULATOR_VOLTAGE,
315 .owner = THIS_MODULE,
316 .csel_reg = MAX77650_REG_CNFG_SBB2_A,
317 .csel_mask = MAX77650_REGULATOR_CURR_LIM_MASK,
318 .curr_table = max77650_current_limit_table,
319 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
320 },
321 .regA = MAX77650_REG_CNFG_SBB2_A,
322 .regB = MAX77650_REG_CNFG_SBB2_B,
323 };
324
max77650_regulator_probe(struct platform_device * pdev)325 static int max77650_regulator_probe(struct platform_device *pdev)
326 {
327 const struct max77650_regulator_desc **rdescs;
328 const struct max77650_regulator_desc *rdesc;
329 struct regulator_config config = { };
330 struct device *dev, *parent;
331 struct regulator_dev *rdev;
332 struct regmap *map;
333 unsigned int val;
334 int i, rv;
335
336 dev = &pdev->dev;
337 parent = dev->parent;
338
339 if (!dev->of_node)
340 dev->of_node = parent->of_node;
341
342 rdescs = devm_kcalloc(dev, MAX77650_REGULATOR_NUM_REGULATORS,
343 sizeof(*rdescs), GFP_KERNEL);
344 if (!rdescs)
345 return -ENOMEM;
346
347 map = dev_get_regmap(parent, NULL);
348 if (!map)
349 return -ENODEV;
350
351 rv = regmap_read(map, MAX77650_REG_CID, &val);
352 if (rv)
353 return rv;
354
355 rdescs[MAX77650_REGULATOR_ID_LDO] = &max77650_LDO_desc;
356 rdescs[MAX77650_REGULATOR_ID_SBB0] = &max77650_SBB0_desc;
357
358 switch (MAX77650_CID_BITS(val)) {
359 case MAX77650_CID_77650A:
360 case MAX77650_CID_77650C:
361 rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77650_SBB1_desc;
362 rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77650_SBB2_desc;
363 break;
364 case MAX77650_CID_77651A:
365 case MAX77650_CID_77651B:
366 rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77651_SBB1_desc;
367 rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77651_SBB2_desc;
368 break;
369 default:
370 return -ENODEV;
371 }
372
373 config.dev = parent;
374
375 for (i = 0; i < MAX77650_REGULATOR_NUM_REGULATORS; i++) {
376 rdesc = rdescs[i];
377
378 rdev = devm_regulator_register(dev, &rdesc->desc, &config);
379 if (IS_ERR(rdev))
380 return PTR_ERR(rdev);
381 }
382
383 return 0;
384 }
385
386 static const struct of_device_id max77650_regulator_of_match[] = {
387 { .compatible = "maxim,max77650-regulator" },
388 { }
389 };
390 MODULE_DEVICE_TABLE(of, max77650_regulator_of_match);
391
392 static struct platform_driver max77650_regulator_driver = {
393 .driver = {
394 .name = "max77650-regulator",
395 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
396 .of_match_table = max77650_regulator_of_match,
397 },
398 .probe = max77650_regulator_probe,
399 };
400 module_platform_driver(max77650_regulator_driver);
401
402 MODULE_DESCRIPTION("MAXIM 77650/77651 regulator driver");
403 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
404 MODULE_LICENSE("GPL v2");
405 MODULE_ALIAS("platform:max77650-regulator");
406