1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Battery charger driver for RT5033
4 *
5 * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
6 * Author: Beomho Seo <beomho.seo@samsung.com>
7 */
8
9 #include <linux/mod_devicetable.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/power_supply.h>
13 #include <linux/regmap.h>
14 #include <linux/mfd/rt5033-private.h>
15
16 struct rt5033_charger_data {
17 unsigned int pre_uamp;
18 unsigned int pre_uvolt;
19 unsigned int const_uvolt;
20 unsigned int eoc_uamp;
21 unsigned int fast_uamp;
22 };
23
24 struct rt5033_charger {
25 struct device *dev;
26 struct regmap *regmap;
27 struct power_supply *psy;
28 struct rt5033_charger_data *chg;
29 };
30
rt5033_get_charger_state(struct rt5033_charger * charger)31 static int rt5033_get_charger_state(struct rt5033_charger *charger)
32 {
33 struct regmap *regmap = charger->regmap;
34 unsigned int reg_data;
35 int state;
36
37 if (!regmap)
38 return POWER_SUPPLY_STATUS_UNKNOWN;
39
40 regmap_read(regmap, RT5033_REG_CHG_STAT, ®_data);
41
42 switch (reg_data & RT5033_CHG_STAT_MASK) {
43 case RT5033_CHG_STAT_DISCHARGING:
44 state = POWER_SUPPLY_STATUS_DISCHARGING;
45 break;
46 case RT5033_CHG_STAT_CHARGING:
47 state = POWER_SUPPLY_STATUS_CHARGING;
48 break;
49 case RT5033_CHG_STAT_FULL:
50 state = POWER_SUPPLY_STATUS_FULL;
51 break;
52 case RT5033_CHG_STAT_NOT_CHARGING:
53 state = POWER_SUPPLY_STATUS_NOT_CHARGING;
54 break;
55 default:
56 state = POWER_SUPPLY_STATUS_UNKNOWN;
57 }
58
59 return state;
60 }
61
rt5033_get_charger_type(struct rt5033_charger * charger)62 static int rt5033_get_charger_type(struct rt5033_charger *charger)
63 {
64 struct regmap *regmap = charger->regmap;
65 unsigned int reg_data;
66 int state;
67
68 regmap_read(regmap, RT5033_REG_CHG_STAT, ®_data);
69
70 switch (reg_data & RT5033_CHG_STAT_TYPE_MASK) {
71 case RT5033_CHG_STAT_TYPE_FAST:
72 state = POWER_SUPPLY_CHARGE_TYPE_FAST;
73 break;
74 case RT5033_CHG_STAT_TYPE_PRE:
75 state = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
76 break;
77 default:
78 state = POWER_SUPPLY_CHARGE_TYPE_NONE;
79 }
80
81 return state;
82 }
83
rt5033_get_charger_current_limit(struct rt5033_charger * charger)84 static int rt5033_get_charger_current_limit(struct rt5033_charger *charger)
85 {
86 struct regmap *regmap = charger->regmap;
87 unsigned int state, reg_data, data;
88
89 regmap_read(regmap, RT5033_REG_CHG_CTRL5, ®_data);
90
91 state = (reg_data & RT5033_CHGCTRL5_ICHG_MASK)
92 >> RT5033_CHGCTRL5_ICHG_SHIFT;
93
94 data = RT5033_CHARGER_FAST_CURRENT_MIN +
95 RT5033_CHARGER_FAST_CURRENT_STEP_NUM * state;
96
97 return data;
98 }
99
rt5033_get_charger_const_voltage(struct rt5033_charger * charger)100 static int rt5033_get_charger_const_voltage(struct rt5033_charger *charger)
101 {
102 struct regmap *regmap = charger->regmap;
103 unsigned int state, reg_data, data;
104
105 regmap_read(regmap, RT5033_REG_CHG_CTRL2, ®_data);
106
107 state = (reg_data & RT5033_CHGCTRL2_CV_MASK)
108 >> RT5033_CHGCTRL2_CV_SHIFT;
109
110 data = RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN +
111 RT5033_CHARGER_CONST_VOLTAGE_STEP_NUM * state;
112
113 return data;
114 }
115
rt5033_init_const_charge(struct rt5033_charger * charger)116 static inline int rt5033_init_const_charge(struct rt5033_charger *charger)
117 {
118 struct rt5033_charger_data *chg = charger->chg;
119 int ret;
120 unsigned int val;
121 u8 reg_data;
122
123 /* Set constant voltage mode */
124 if (chg->const_uvolt < RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN ||
125 chg->const_uvolt > RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MAX) {
126 dev_err(charger->dev,
127 "Value 'constant-charge-voltage-max-microvolt' out of range\n");
128 return -EINVAL;
129 }
130
131 if (chg->const_uvolt == RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN)
132 reg_data = 0x00;
133 else if (chg->const_uvolt == RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MAX)
134 reg_data = RT5033_CV_MAX_VOLTAGE;
135 else {
136 val = chg->const_uvolt;
137 val -= RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN;
138 val /= RT5033_CHARGER_CONST_VOLTAGE_STEP_NUM;
139 reg_data = val;
140 }
141
142 ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL2,
143 RT5033_CHGCTRL2_CV_MASK,
144 reg_data << RT5033_CHGCTRL2_CV_SHIFT);
145 if (ret) {
146 dev_err(charger->dev, "Failed regmap update\n");
147 return -EINVAL;
148 }
149
150 /* Set end of charge current */
151 if (chg->eoc_uamp < RT5033_CHARGER_EOC_MIN ||
152 chg->eoc_uamp > RT5033_CHARGER_EOC_MAX) {
153 dev_err(charger->dev,
154 "Value 'charge-term-current-microamp' out of range\n");
155 return -EINVAL;
156 }
157
158 if (chg->eoc_uamp == RT5033_CHARGER_EOC_MIN)
159 reg_data = 0x01;
160 else if (chg->eoc_uamp == RT5033_CHARGER_EOC_MAX)
161 reg_data = 0x07;
162 else {
163 val = chg->eoc_uamp;
164 if (val < RT5033_CHARGER_EOC_REF) {
165 val -= RT5033_CHARGER_EOC_MIN;
166 val /= RT5033_CHARGER_EOC_STEP_NUM1;
167 reg_data = 0x01 + val;
168 } else if (val > RT5033_CHARGER_EOC_REF) {
169 val -= RT5033_CHARGER_EOC_REF;
170 val /= RT5033_CHARGER_EOC_STEP_NUM2;
171 reg_data = 0x04 + val;
172 } else {
173 reg_data = 0x04;
174 }
175 }
176
177 ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,
178 RT5033_CHGCTRL4_EOC_MASK, reg_data);
179 if (ret) {
180 dev_err(charger->dev, "Failed regmap update\n");
181 return -EINVAL;
182 }
183
184 return 0;
185 }
186
rt5033_init_fast_charge(struct rt5033_charger * charger)187 static inline int rt5033_init_fast_charge(struct rt5033_charger *charger)
188 {
189 struct rt5033_charger_data *chg = charger->chg;
190 int ret;
191 unsigned int val;
192 u8 reg_data;
193
194 /* Set limit input current */
195 ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1,
196 RT5033_CHGCTRL1_IAICR_MASK, RT5033_AICR_2000_MODE);
197 if (ret) {
198 dev_err(charger->dev, "Failed regmap update\n");
199 return -EINVAL;
200 }
201
202 /* Set fast-charge mode charging current */
203 if (chg->fast_uamp < RT5033_CHARGER_FAST_CURRENT_MIN ||
204 chg->fast_uamp > RT5033_CHARGER_FAST_CURRENT_MAX) {
205 dev_err(charger->dev,
206 "Value 'constant-charge-current-max-microamp' out of range\n");
207 return -EINVAL;
208 }
209
210 if (chg->fast_uamp == RT5033_CHARGER_FAST_CURRENT_MIN)
211 reg_data = 0x00;
212 else if (chg->fast_uamp == RT5033_CHARGER_FAST_CURRENT_MAX)
213 reg_data = RT5033_CHG_MAX_CURRENT;
214 else {
215 val = chg->fast_uamp;
216 val -= RT5033_CHARGER_FAST_CURRENT_MIN;
217 val /= RT5033_CHARGER_FAST_CURRENT_STEP_NUM;
218 reg_data = val;
219 }
220
221 ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL5,
222 RT5033_CHGCTRL5_ICHG_MASK,
223 reg_data << RT5033_CHGCTRL5_ICHG_SHIFT);
224 if (ret) {
225 dev_err(charger->dev, "Failed regmap update\n");
226 return -EINVAL;
227 }
228
229 return 0;
230 }
231
rt5033_init_pre_charge(struct rt5033_charger * charger)232 static inline int rt5033_init_pre_charge(struct rt5033_charger *charger)
233 {
234 struct rt5033_charger_data *chg = charger->chg;
235 int ret;
236 unsigned int val;
237 u8 reg_data;
238
239 /* Set pre-charge threshold voltage */
240 if (chg->pre_uvolt < RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN ||
241 chg->pre_uvolt > RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MAX) {
242 dev_err(charger->dev,
243 "Value 'precharge-upper-limit-microvolt' out of range\n");
244 return -EINVAL;
245 }
246
247 if (chg->pre_uvolt == RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN)
248 reg_data = 0x00;
249 else if (chg->pre_uvolt == RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MAX)
250 reg_data = 0x0f;
251 else {
252 val = chg->pre_uvolt;
253 val -= RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN;
254 val /= RT5033_CHARGER_PRE_THRESHOLD_STEP_NUM;
255 reg_data = val;
256 }
257
258 ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL5,
259 RT5033_CHGCTRL5_VPREC_MASK, reg_data);
260 if (ret) {
261 dev_err(charger->dev, "Failed regmap update\n");
262 return -EINVAL;
263 }
264
265 /* Set pre-charge mode charging current */
266 if (chg->pre_uamp < RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN ||
267 chg->pre_uamp > RT5033_CHARGER_PRE_CURRENT_LIMIT_MAX) {
268 dev_err(charger->dev,
269 "Value 'precharge-current-microamp' out of range\n");
270 return -EINVAL;
271 }
272
273 if (chg->pre_uamp == RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN)
274 reg_data = 0x00;
275 else if (chg->pre_uamp == RT5033_CHARGER_PRE_CURRENT_LIMIT_MAX)
276 reg_data = RT5033_CHG_MAX_PRE_CURRENT;
277 else {
278 val = chg->pre_uamp;
279 val -= RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN;
280 val /= RT5033_CHARGER_PRE_CURRENT_STEP_NUM;
281 reg_data = val;
282 }
283
284 ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,
285 RT5033_CHGCTRL4_IPREC_MASK,
286 reg_data << RT5033_CHGCTRL4_IPREC_SHIFT);
287 if (ret) {
288 dev_err(charger->dev, "Failed regmap update\n");
289 return -EINVAL;
290 }
291
292 return 0;
293 }
294
rt5033_charger_reg_init(struct rt5033_charger * charger)295 static int rt5033_charger_reg_init(struct rt5033_charger *charger)
296 {
297 int ret = 0;
298
299 /* Enable charging termination */
300 ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1,
301 RT5033_CHGCTRL1_TE_EN_MASK, RT5033_TE_ENABLE);
302 if (ret) {
303 dev_err(charger->dev, "Failed to enable charging termination.\n");
304 return -EINVAL;
305 }
306
307 /*
308 * Disable minimum input voltage regulation (MIVR), this improves
309 * the charging performance.
310 */
311 ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,
312 RT5033_CHGCTRL4_MIVR_MASK, RT5033_CHARGER_MIVR_DISABLE);
313 if (ret) {
314 dev_err(charger->dev, "Failed to disable MIVR.\n");
315 return -EINVAL;
316 }
317
318 ret = rt5033_init_pre_charge(charger);
319 if (ret)
320 return ret;
321
322 ret = rt5033_init_fast_charge(charger);
323 if (ret)
324 return ret;
325
326 ret = rt5033_init_const_charge(charger);
327 if (ret)
328 return ret;
329
330 return 0;
331 }
332
333 static enum power_supply_property rt5033_charger_props[] = {
334 POWER_SUPPLY_PROP_STATUS,
335 POWER_SUPPLY_PROP_CHARGE_TYPE,
336 POWER_SUPPLY_PROP_CURRENT_MAX,
337 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
338 POWER_SUPPLY_PROP_MODEL_NAME,
339 POWER_SUPPLY_PROP_MANUFACTURER,
340 POWER_SUPPLY_PROP_ONLINE,
341 };
342
rt5033_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)343 static int rt5033_charger_get_property(struct power_supply *psy,
344 enum power_supply_property psp,
345 union power_supply_propval *val)
346 {
347 struct rt5033_charger *charger = power_supply_get_drvdata(psy);
348
349 switch (psp) {
350 case POWER_SUPPLY_PROP_STATUS:
351 val->intval = rt5033_get_charger_state(charger);
352 break;
353 case POWER_SUPPLY_PROP_CHARGE_TYPE:
354 val->intval = rt5033_get_charger_type(charger);
355 break;
356 case POWER_SUPPLY_PROP_CURRENT_MAX:
357 val->intval = rt5033_get_charger_current_limit(charger);
358 break;
359 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
360 val->intval = rt5033_get_charger_const_voltage(charger);
361 break;
362 case POWER_SUPPLY_PROP_MODEL_NAME:
363 val->strval = RT5033_CHARGER_MODEL;
364 break;
365 case POWER_SUPPLY_PROP_MANUFACTURER:
366 val->strval = RT5033_MANUFACTURER;
367 break;
368 case POWER_SUPPLY_PROP_ONLINE:
369 val->intval = (rt5033_get_charger_state(charger) ==
370 POWER_SUPPLY_STATUS_CHARGING);
371 break;
372 default:
373 return -EINVAL;
374 }
375
376 return 0;
377 }
378
rt5033_charger_dt_init(struct rt5033_charger * charger)379 static struct rt5033_charger_data *rt5033_charger_dt_init(
380 struct rt5033_charger *charger)
381 {
382 struct rt5033_charger_data *chg;
383 struct power_supply_battery_info *info;
384 int ret;
385
386 chg = devm_kzalloc(charger->dev, sizeof(*chg), GFP_KERNEL);
387 if (!chg)
388 return ERR_PTR(-ENOMEM);
389
390 ret = power_supply_get_battery_info(charger->psy, &info);
391 if (ret)
392 return ERR_PTR(dev_err_probe(charger->dev, -EINVAL,
393 "missing battery info\n"));
394
395 /* Assign data. Validity will be checked in the init functions. */
396 chg->pre_uamp = info->precharge_current_ua;
397 chg->fast_uamp = info->constant_charge_current_max_ua;
398 chg->eoc_uamp = info->charge_term_current_ua;
399 chg->pre_uvolt = info->precharge_voltage_max_uv;
400 chg->const_uvolt = info->constant_charge_voltage_max_uv;
401
402 return chg;
403 }
404
405 static const struct power_supply_desc rt5033_charger_desc = {
406 .name = "rt5033-charger",
407 .type = POWER_SUPPLY_TYPE_USB,
408 .properties = rt5033_charger_props,
409 .num_properties = ARRAY_SIZE(rt5033_charger_props),
410 .get_property = rt5033_charger_get_property,
411 };
412
rt5033_charger_probe(struct platform_device * pdev)413 static int rt5033_charger_probe(struct platform_device *pdev)
414 {
415 struct rt5033_charger *charger;
416 struct power_supply_config psy_cfg = {};
417 int ret;
418
419 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
420 if (!charger)
421 return -ENOMEM;
422
423 platform_set_drvdata(pdev, charger);
424 charger->dev = &pdev->dev;
425 charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
426
427 psy_cfg.of_node = pdev->dev.of_node;
428 psy_cfg.drv_data = charger;
429
430 charger->psy = devm_power_supply_register(&pdev->dev,
431 &rt5033_charger_desc,
432 &psy_cfg);
433 if (IS_ERR(charger->psy))
434 return dev_err_probe(&pdev->dev, PTR_ERR(charger->psy),
435 "Failed to register power supply\n");
436
437 charger->chg = rt5033_charger_dt_init(charger);
438 if (IS_ERR_OR_NULL(charger->chg))
439 return PTR_ERR(charger->chg);
440
441 ret = rt5033_charger_reg_init(charger);
442 if (ret)
443 return ret;
444
445 return 0;
446 }
447
448 static const struct platform_device_id rt5033_charger_id[] = {
449 { "rt5033-charger", },
450 { }
451 };
452 MODULE_DEVICE_TABLE(platform, rt5033_charger_id);
453
454 static const struct of_device_id rt5033_charger_of_match[] = {
455 { .compatible = "richtek,rt5033-charger", },
456 { }
457 };
458 MODULE_DEVICE_TABLE(of, rt5033_charger_of_match);
459
460 static struct platform_driver rt5033_charger_driver = {
461 .driver = {
462 .name = "rt5033-charger",
463 .of_match_table = rt5033_charger_of_match,
464 },
465 .probe = rt5033_charger_probe,
466 .id_table = rt5033_charger_id,
467 };
468 module_platform_driver(rt5033_charger_driver);
469
470 MODULE_DESCRIPTION("Richtek RT5033 charger driver");
471 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
472 MODULE_LICENSE("GPL v2");
473