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
35struct 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
112static const struct regulator_ops max8907_mbatt_ops = {
113};
114
115static 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
124static 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
130static const struct regulator_ops max8907_fixed_ops = {
131 .list_voltage = regulator_list_voltage_linear,
132};
133
134static 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
141static const struct regulator_ops max8907_out5v_hwctl_ops = {
142 .list_voltage = regulator_list_voltage_linear,
143};
144
145static 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
151static 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
192static 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
224static 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
251static inline struct regulator_init_data *match_init_data(int index)
252{
253 return max8907_matches[index].init_data;
254}
255
256static inline struct device_node *match_of_node(int index)
257{
258 return max8907_matches[index].of_node;
259}
260#else
261static int max8907_regulator_parse_dt(struct platform_device *pdev)
262{
263 return 0;
264}
265
266static inline struct regulator_init_data *match_init_data(int index)
267{
268 return NULL;
269}
270
271static inline struct device_node *match_of_node(int index)
272{
273 return NULL;
274}
275#endif
276
277static 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 regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
303 if ((val & MAX8907_II2RR_VERSION_MASK) ==
304 MAX8907_II2RR_VERSION_REV_B) {
305 pmic->desc[MAX8907_SD1].min_uV = 637500;
306 pmic->desc[MAX8907_SD1].uV_step = 12500;
307 pmic->desc[MAX8907_SD1].n_voltages =
308 (1425000 - 637500) / 12500 + 1;
309 }
310
311 for (i = 0; i < MAX8907_NUM_REGULATORS; i++) {
312 struct regulator_dev *rdev;
313
314 config.dev = pdev->dev.parent;
315 if (pdata)
316 idata = pdata->init_data[i];
317 else
318 idata = match_init_data(i);
319 config.init_data = idata;
320 config.driver_data = pmic;
321 config.regmap = max8907->regmap_gen;
322 config.of_node = match_of_node(i);
323
324 switch (pmic->desc[i].id) {
325 case MAX8907_MBATT:
326 if (idata && idata->constraints.name)
327 mbatt_rail_name = idata->constraints.name;
328 else
329 mbatt_rail_name = pmic->desc[i].name;
330 break;
331 case MAX8907_BBAT:
332 case MAX8907_SDBY:
333 case MAX8907_VRTC:
334 idata->supply_regulator = mbatt_rail_name;
335 break;
336 }
337
338 if (pmic->desc[i].ops == &max8907_ldo_ops) {
339 regmap_read(config.regmap, pmic->desc[i].enable_reg,
340 &val);
341 if ((val & MAX8907_MASK_LDO_SEQ) !=
342 MAX8907_MASK_LDO_SEQ)
343 pmic->desc[i].ops = &max8907_ldo_hwctl_ops;
344 } else if (pmic->desc[i].ops == &max8907_out5v_ops) {
345 regmap_read(config.regmap, pmic->desc[i].enable_reg,
346 &val);
347 if ((val & (MAX8907_MASK_OUT5V_VINEN |
348 MAX8907_MASK_OUT5V_ENSRC)) !=
349 MAX8907_MASK_OUT5V_ENSRC)
350 pmic->desc[i].ops = &max8907_out5v_hwctl_ops;
351 }
352
353 rdev = devm_regulator_register(&pdev->dev,
354 &pmic->desc[i], &config);
355 if (IS_ERR(rdev)) {
356 dev_err(&pdev->dev,
357 "failed to register %s regulator\n",
358 pmic->desc[i].name);
359 return PTR_ERR(rdev);
360 }
361 }
362
363 return 0;
364}
365
366static struct platform_driver max8907_regulator_driver = {
367 .driver = {
368 .name = "max8907-regulator",
369 },
370 .probe = max8907_regulator_probe,
371};
372
373static int __init max8907_regulator_init(void)
374{
375 return platform_driver_register(&max8907_regulator_driver);
376}
377
378subsys_initcall(max8907_regulator_init);
379
380static void __exit max8907_reg_exit(void)
381{
382 platform_driver_unregister(&max8907_regulator_driver);
383}
384
385module_exit(max8907_reg_exit);
386
387MODULE_DESCRIPTION("MAX8907 regulator driver");
388MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
389MODULE_LICENSE("GPL v2");
390MODULE_ALIAS("platform:max8907-regulator");
391