1 /*
2 * max8907-regulator.c -- support regulators in max8907
3 *
4 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
5 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
6 *
7 * Portions based on drivers/regulator/tps65910-regulator.c,
8 * Copyright 2010 Texas Instruments Inc.
9 * Author: Graeme Gregory <gg@slimlogic.co.uk>
10 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17 #include <linux/err.h>
18 #include <linux/init.h>
19 #include <linux/mfd/core.h>
20 #include <linux/mfd/max8907.h>
21 #include <linux/module.h>
22 #include <linux/of.h>
23 #include <linux/platform_device.h>
24 #include <linux/regulator/driver.h>
25 #include <linux/regulator/machine.h>
26 #include <linux/regulator/of_regulator.h>
27 #include <linux/regmap.h>
28 #include <linux/slab.h>
29
30 #define MAX8907_II2RR_VERSION_MASK 0xF0
31 #define MAX8907_II2RR_VERSION_REV_A 0x00
32 #define MAX8907_II2RR_VERSION_REV_B 0x10
33 #define MAX8907_II2RR_VERSION_REV_C 0x30
34
35 struct max8907_regulator {
36 struct regulator_desc desc[MAX8907_NUM_REGULATORS];
37 };
38
39 #define REG_MBATT() \
40 [MAX8907_MBATT] = { \
41 .name = "MBATT", \
42 .supply_name = "mbatt", \
43 .id = MAX8907_MBATT, \
44 .ops = &max8907_mbatt_ops, \
45 .type = REGULATOR_VOLTAGE, \
46 .owner = THIS_MODULE, \
47 }
48
49 #define REG_LDO(ids, supply, base, min, max, step) \
50 [MAX8907_##ids] = { \
51 .name = #ids, \
52 .supply_name = supply, \
53 .id = MAX8907_##ids, \
54 .n_voltages = ((max) - (min)) / (step) + 1, \
55 .ops = &max8907_ldo_ops, \
56 .type = REGULATOR_VOLTAGE, \
57 .owner = THIS_MODULE, \
58 .min_uV = (min), \
59 .uV_step = (step), \
60 .vsel_reg = (base) + MAX8907_VOUT, \
61 .vsel_mask = 0x3f, \
62 .enable_reg = (base) + MAX8907_CTL, \
63 .enable_mask = MAX8907_MASK_LDO_EN, \
64 }
65
66 #define REG_FIXED(ids, supply, voltage) \
67 [MAX8907_##ids] = { \
68 .name = #ids, \
69 .supply_name = supply, \
70 .id = MAX8907_##ids, \
71 .n_voltages = 1, \
72 .ops = &max8907_fixed_ops, \
73 .type = REGULATOR_VOLTAGE, \
74 .owner = THIS_MODULE, \
75 .min_uV = (voltage), \
76 }
77
78 #define REG_OUT5V(ids, supply, base, voltage) \
79 [MAX8907_##ids] = { \
80 .name = #ids, \
81 .supply_name = supply, \
82 .id = MAX8907_##ids, \
83 .n_voltages = 1, \
84 .ops = &max8907_out5v_ops, \
85 .type = REGULATOR_VOLTAGE, \
86 .owner = THIS_MODULE, \
87 .min_uV = (voltage), \
88 .enable_reg = (base), \
89 .enable_mask = MAX8907_MASK_OUT5V_EN, \
90 }
91
92 #define REG_BBAT(ids, supply, base, min, max, step) \
93 [MAX8907_##ids] = { \
94 .name = #ids, \
95 .supply_name = supply, \
96 .id = MAX8907_##ids, \
97 .n_voltages = ((max) - (min)) / (step) + 1, \
98 .ops = &max8907_bbat_ops, \
99 .type = REGULATOR_VOLTAGE, \
100 .owner = THIS_MODULE, \
101 .min_uV = (min), \
102 .uV_step = (step), \
103 .vsel_reg = (base), \
104 .vsel_mask = MAX8907_MASK_VBBATTCV, \
105 }
106
107 #define LDO_750_50(id, supply, base) REG_LDO(id, supply, (base), \
108 750000, 3900000, 50000)
109 #define LDO_650_25(id, supply, base) REG_LDO(id, supply, (base), \
110 650000, 2225000, 25000)
111
112 static const struct regulator_ops max8907_mbatt_ops = {
113 };
114
115 static struct regulator_ops max8907_ldo_ops = {
116 .list_voltage = regulator_list_voltage_linear,
117 .set_voltage_sel = regulator_set_voltage_sel_regmap,
118 .get_voltage_sel = regulator_get_voltage_sel_regmap,
119 .enable = regulator_enable_regmap,
120 .disable = regulator_disable_regmap,
121 .is_enabled = regulator_is_enabled_regmap,
122 };
123
124 static const struct regulator_ops max8907_ldo_hwctl_ops = {
125 .list_voltage = regulator_list_voltage_linear,
126 .set_voltage_sel = regulator_set_voltage_sel_regmap,
127 .get_voltage_sel = regulator_get_voltage_sel_regmap,
128 };
129
130 static const struct regulator_ops max8907_fixed_ops = {
131 .list_voltage = regulator_list_voltage_linear,
132 };
133
134 static struct regulator_ops max8907_out5v_ops = {
135 .list_voltage = regulator_list_voltage_linear,
136 .enable = regulator_enable_regmap,
137 .disable = regulator_disable_regmap,
138 .is_enabled = regulator_is_enabled_regmap,
139 };
140
141 static const struct regulator_ops max8907_out5v_hwctl_ops = {
142 .list_voltage = regulator_list_voltage_linear,
143 };
144
145 static const struct regulator_ops max8907_bbat_ops = {
146 .list_voltage = regulator_list_voltage_linear,
147 .set_voltage_sel = regulator_set_voltage_sel_regmap,
148 .get_voltage_sel = regulator_get_voltage_sel_regmap,
149 };
150
151 static struct regulator_desc max8907_regulators[] = {
152 REG_MBATT(),
153 REG_LDO(SD1, "in-v1", MAX8907_REG_SDCTL1, 650000, 2225000, 25000),
154 REG_LDO(SD2, "in-v2", MAX8907_REG_SDCTL2, 637500, 1425000, 12500),
155 REG_LDO(SD3, "in-v3", MAX8907_REG_SDCTL3, 750000, 3900000, 50000),
156 LDO_750_50(LDO1, "in1", MAX8907_REG_LDOCTL1),
157 LDO_650_25(LDO2, "in2", MAX8907_REG_LDOCTL2),
158 LDO_650_25(LDO3, "in3", MAX8907_REG_LDOCTL3),
159 LDO_750_50(LDO4, "in4", MAX8907_REG_LDOCTL4),
160 LDO_750_50(LDO5, "in5", MAX8907_REG_LDOCTL5),
161 LDO_750_50(LDO6, "in6", MAX8907_REG_LDOCTL6),
162 LDO_750_50(LDO7, "in7", MAX8907_REG_LDOCTL7),
163 LDO_750_50(LDO8, "in8", MAX8907_REG_LDOCTL8),
164 LDO_750_50(LDO9, "in9", MAX8907_REG_LDOCTL9),
165 LDO_750_50(LDO10, "in10", MAX8907_REG_LDOCTL10),
166 LDO_750_50(LDO11, "in11", MAX8907_REG_LDOCTL11),
167 LDO_750_50(LDO12, "in12", MAX8907_REG_LDOCTL12),
168 LDO_750_50(LDO13, "in13", MAX8907_REG_LDOCTL13),
169 LDO_750_50(LDO14, "in14", MAX8907_REG_LDOCTL14),
170 LDO_750_50(LDO15, "in15", MAX8907_REG_LDOCTL15),
171 LDO_750_50(LDO16, "in16", MAX8907_REG_LDOCTL16),
172 LDO_650_25(LDO17, "in17", MAX8907_REG_LDOCTL17),
173 LDO_650_25(LDO18, "in18", MAX8907_REG_LDOCTL18),
174 LDO_750_50(LDO19, "in19", MAX8907_REG_LDOCTL19),
175 LDO_750_50(LDO20, "in20", MAX8907_REG_LDOCTL20),
176 REG_OUT5V(OUT5V, "mbatt", MAX8907_REG_OUT5VEN, 5000000),
177 REG_OUT5V(OUT33V, "mbatt", MAX8907_REG_OUT33VEN, 3300000),
178 REG_BBAT(BBAT, "MBATT", MAX8907_REG_BBAT_CNFG,
179 2400000, 3000000, 200000),
180 REG_FIXED(SDBY, "MBATT", 1200000),
181 REG_FIXED(VRTC, "MBATT", 3300000),
182 };
183
184 #ifdef CONFIG_OF
185
186 #define MATCH(_name, _id) \
187 [MAX8907_##_id] = { \
188 .name = #_name, \
189 .driver_data = (void *)&max8907_regulators[MAX8907_##_id], \
190 }
191
192 static struct of_regulator_match max8907_matches[] = {
193 MATCH(mbatt, MBATT),
194 MATCH(sd1, SD1),
195 MATCH(sd2, SD2),
196 MATCH(sd3, SD3),
197 MATCH(ldo1, LDO1),
198 MATCH(ldo2, LDO2),
199 MATCH(ldo3, LDO3),
200 MATCH(ldo4, LDO4),
201 MATCH(ldo5, LDO5),
202 MATCH(ldo6, LDO6),
203 MATCH(ldo7, LDO7),
204 MATCH(ldo8, LDO8),
205 MATCH(ldo9, LDO9),
206 MATCH(ldo10, LDO10),
207 MATCH(ldo11, LDO11),
208 MATCH(ldo12, LDO12),
209 MATCH(ldo13, LDO13),
210 MATCH(ldo14, LDO14),
211 MATCH(ldo15, LDO15),
212 MATCH(ldo16, LDO16),
213 MATCH(ldo17, LDO17),
214 MATCH(ldo18, LDO18),
215 MATCH(ldo19, LDO19),
216 MATCH(ldo20, LDO20),
217 MATCH(out5v, OUT5V),
218 MATCH(out33v, OUT33V),
219 MATCH(bbat, BBAT),
220 MATCH(sdby, SDBY),
221 MATCH(vrtc, VRTC),
222 };
223
max8907_regulator_parse_dt(struct platform_device * pdev)224 static int max8907_regulator_parse_dt(struct platform_device *pdev)
225 {
226 struct device_node *np, *regulators;
227 int ret;
228
229 np = pdev->dev.parent->of_node;
230 if (!np)
231 return 0;
232
233 regulators = of_get_child_by_name(np, "regulators");
234 if (!regulators) {
235 dev_err(&pdev->dev, "regulators node not found\n");
236 return -EINVAL;
237 }
238
239 ret = of_regulator_match(&pdev->dev, regulators, max8907_matches,
240 ARRAY_SIZE(max8907_matches));
241 of_node_put(regulators);
242 if (ret < 0) {
243 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
244 ret);
245 return ret;
246 }
247
248 return 0;
249 }
250
match_init_data(int index)251 static inline struct regulator_init_data *match_init_data(int index)
252 {
253 return max8907_matches[index].init_data;
254 }
255
match_of_node(int index)256 static inline struct device_node *match_of_node(int index)
257 {
258 return max8907_matches[index].of_node;
259 }
260 #else
max8907_regulator_parse_dt(struct platform_device * pdev)261 static int max8907_regulator_parse_dt(struct platform_device *pdev)
262 {
263 return 0;
264 }
265
match_init_data(int index)266 static inline struct regulator_init_data *match_init_data(int index)
267 {
268 return NULL;
269 }
270
match_of_node(int index)271 static inline struct device_node *match_of_node(int index)
272 {
273 return NULL;
274 }
275 #endif
276
max8907_regulator_probe(struct platform_device * pdev)277 static int max8907_regulator_probe(struct platform_device *pdev)
278 {
279 struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
280 struct max8907_platform_data *pdata = dev_get_platdata(max8907->dev);
281 int ret;
282 struct max8907_regulator *pmic;
283 unsigned int val;
284 int i;
285 struct regulator_config config = {};
286 struct regulator_init_data *idata;
287 const char *mbatt_rail_name = NULL;
288
289 ret = max8907_regulator_parse_dt(pdev);
290 if (ret)
291 return ret;
292
293 pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
294 if (!pmic)
295 return -ENOMEM;
296
297 platform_set_drvdata(pdev, pmic);
298
299 memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc));
300
301 /* Backwards compatibility with MAX8907B; SD1 uses different voltages */
302 ret = regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
303 if (ret)
304 return ret;
305
306 if ((val & MAX8907_II2RR_VERSION_MASK) ==
307 MAX8907_II2RR_VERSION_REV_B) {
308 pmic->desc[MAX8907_SD1].min_uV = 637500;
309 pmic->desc[MAX8907_SD1].uV_step = 12500;
310 pmic->desc[MAX8907_SD1].n_voltages =
311 (1425000 - 637500) / 12500 + 1;
312 }
313
314 for (i = 0; i < MAX8907_NUM_REGULATORS; i++) {
315 struct regulator_dev *rdev;
316
317 config.dev = pdev->dev.parent;
318 if (pdata)
319 idata = pdata->init_data[i];
320 else
321 idata = match_init_data(i);
322 config.init_data = idata;
323 config.driver_data = pmic;
324 config.regmap = max8907->regmap_gen;
325 config.of_node = match_of_node(i);
326
327 switch (pmic->desc[i].id) {
328 case MAX8907_MBATT:
329 if (idata && idata->constraints.name)
330 mbatt_rail_name = idata->constraints.name;
331 else
332 mbatt_rail_name = pmic->desc[i].name;
333 break;
334 case MAX8907_BBAT:
335 case MAX8907_SDBY:
336 case MAX8907_VRTC:
337 idata->supply_regulator = mbatt_rail_name;
338 break;
339 }
340
341 if (pmic->desc[i].ops == &max8907_ldo_ops) {
342 ret = regmap_read(config.regmap, pmic->desc[i].enable_reg,
343 &val);
344 if (ret)
345 return ret;
346
347 if ((val & MAX8907_MASK_LDO_SEQ) !=
348 MAX8907_MASK_LDO_SEQ)
349 pmic->desc[i].ops = &max8907_ldo_hwctl_ops;
350 } else if (pmic->desc[i].ops == &max8907_out5v_ops) {
351 ret = regmap_read(config.regmap, pmic->desc[i].enable_reg,
352 &val);
353 if (ret)
354 return ret;
355
356 if ((val & (MAX8907_MASK_OUT5V_VINEN |
357 MAX8907_MASK_OUT5V_ENSRC)) !=
358 MAX8907_MASK_OUT5V_ENSRC)
359 pmic->desc[i].ops = &max8907_out5v_hwctl_ops;
360 }
361
362 rdev = devm_regulator_register(&pdev->dev,
363 &pmic->desc[i], &config);
364 if (IS_ERR(rdev)) {
365 dev_err(&pdev->dev,
366 "failed to register %s regulator\n",
367 pmic->desc[i].name);
368 return PTR_ERR(rdev);
369 }
370 }
371
372 return 0;
373 }
374
375 static struct platform_driver max8907_regulator_driver = {
376 .driver = {
377 .name = "max8907-regulator",
378 },
379 .probe = max8907_regulator_probe,
380 };
381
max8907_regulator_init(void)382 static int __init max8907_regulator_init(void)
383 {
384 return platform_driver_register(&max8907_regulator_driver);
385 }
386
387 subsys_initcall(max8907_regulator_init);
388
max8907_reg_exit(void)389 static void __exit max8907_reg_exit(void)
390 {
391 platform_driver_unregister(&max8907_regulator_driver);
392 }
393
394 module_exit(max8907_reg_exit);
395
396 MODULE_DESCRIPTION("MAX8907 regulator driver");
397 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
398 MODULE_LICENSE("GPL v2");
399 MODULE_ALIAS("platform:max8907-regulator");
400